1 /*
2 * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
3 *
4 * Device driver for Microgate SyncLink Multiport
5 * high speed multiprotocol serial adapter.
6 *
7 * written by Paul Fulghum for Microgate Corporation
8 * paulkf@microgate.com
9 *
10 * Microgate and SyncLink are trademarks of Microgate Corporation
11 *
12 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
13 * This code is released under the GNU General Public License (GPL)
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
25 * OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
29 #if defined(__i386__)
30 # define BREAKPOINT() asm(" int $3");
31 #else
32 # define BREAKPOINT() { }
33 #endif
34
35 #define MAX_DEVICES 12
36
37 #include <linux/module.h>
38 #include <linux/errno.h>
39 #include <linux/signal.h>
40 #include <linux/sched.h>
41 #include <linux/timer.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/major.h>
48 #include <linux/string.h>
49 #include <linux/fcntl.h>
50 #include <linux/ptrace.h>
51 #include <linux/ioport.h>
52 #include <linux/mm.h>
53 #include <linux/seq_file.h>
54 #include <linux/slab.h>
55 #include <linux/netdevice.h>
56 #include <linux/vmalloc.h>
57 #include <linux/init.h>
58 #include <linux/delay.h>
59 #include <linux/ioctl.h>
60
61 #include <asm/system.h>
62 #include <asm/io.h>
63 #include <asm/irq.h>
64 #include <asm/dma.h>
65 #include <linux/bitops.h>
66 #include <asm/types.h>
67 #include <linux/termios.h>
68 #include <linux/workqueue.h>
69 #include <linux/hdlc.h>
70 #include <linux/synclink.h>
71
72 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
73 #define SYNCLINK_GENERIC_HDLC 1
74 #else
75 #define SYNCLINK_GENERIC_HDLC 0
76 #endif
77
78 #define GET_USER(error,value,addr) error = get_user(value,addr)
79 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
80 #define PUT_USER(error,value,addr) error = put_user(value,addr)
81 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
82
83 #include <asm/uaccess.h>
84
85 static MGSL_PARAMS default_params = {
86 MGSL_MODE_HDLC, /* unsigned long mode */
87 0, /* unsigned char loopback; */
88 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
89 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
90 0, /* unsigned long clock_speed; */
91 0xff, /* unsigned char addr_filter; */
92 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
93 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
94 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
95 9600, /* unsigned long data_rate; */
96 8, /* unsigned char data_bits; */
97 1, /* unsigned char stop_bits; */
98 ASYNC_PARITY_NONE /* unsigned char parity; */
99 };
100
101 /* size in bytes of DMA data buffers */
102 #define SCABUFSIZE 1024
103 #define SCA_MEM_SIZE 0x40000
104 #define SCA_BASE_SIZE 512
105 #define SCA_REG_SIZE 16
106 #define SCA_MAX_PORTS 4
107 #define SCAMAXDESC 128
108
109 #define BUFFERLISTSIZE 4096
110
111 /* SCA-I style DMA buffer descriptor */
112 typedef struct _SCADESC
113 {
114 u16 next; /* lower l6 bits of next descriptor addr */
115 u16 buf_ptr; /* lower 16 bits of buffer addr */
116 u8 buf_base; /* upper 8 bits of buffer addr */
117 u8 pad1;
118 u16 length; /* length of buffer */
119 u8 status; /* status of buffer */
120 u8 pad2;
121 } SCADESC, *PSCADESC;
122
123 typedef struct _SCADESC_EX
124 {
125 /* device driver bookkeeping section */
126 char *virt_addr; /* virtual address of data buffer */
127 u16 phys_entry; /* lower 16-bits of physical address of this descriptor */
128 } SCADESC_EX, *PSCADESC_EX;
129
130 /* The queue of BH actions to be performed */
131
132 #define BH_RECEIVE 1
133 #define BH_TRANSMIT 2
134 #define BH_STATUS 4
135
136 #define IO_PIN_SHUTDOWN_LIMIT 100
137
138 struct _input_signal_events {
139 int ri_up;
140 int ri_down;
141 int dsr_up;
142 int dsr_down;
143 int dcd_up;
144 int dcd_down;
145 int cts_up;
146 int cts_down;
147 };
148
149 /*
150 * Device instance data structure
151 */
152 typedef struct _synclinkmp_info {
153 void *if_ptr; /* General purpose pointer (used by SPPP) */
154 int magic;
155 struct tty_port port;
156 int line;
157 unsigned short close_delay;
158 unsigned short closing_wait; /* time to wait before closing */
159
160 struct mgsl_icount icount;
161
162 int timeout;
163 int x_char; /* xon/xoff character */
164 u16 read_status_mask1; /* break detection (SR1 indications) */
165 u16 read_status_mask2; /* parity/framing/overun (SR2 indications) */
166 unsigned char ignore_status_mask1; /* break detection (SR1 indications) */
167 unsigned char ignore_status_mask2; /* parity/framing/overun (SR2 indications) */
168 unsigned char *tx_buf;
169 int tx_put;
170 int tx_get;
171 int tx_count;
172
173 wait_queue_head_t status_event_wait_q;
174 wait_queue_head_t event_wait_q;
175 struct timer_list tx_timer; /* HDLC transmit timeout timer */
176 struct _synclinkmp_info *next_device; /* device list link */
177 struct timer_list status_timer; /* input signal status check timer */
178
179 spinlock_t lock; /* spinlock for synchronizing with ISR */
180 struct work_struct task; /* task structure for scheduling bh */
181
182 u32 max_frame_size; /* as set by device config */
183
184 u32 pending_bh;
185
186 bool bh_running; /* Protection from multiple */
187 int isr_overflow;
188 bool bh_requested;
189
190 int dcd_chkcount; /* check counts to prevent */
191 int cts_chkcount; /* too many IRQs if a signal */
192 int dsr_chkcount; /* is floating */
193 int ri_chkcount;
194
195 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
196 unsigned long buffer_list_phys;
197
198 unsigned int rx_buf_count; /* count of total allocated Rx buffers */
199 SCADESC *rx_buf_list; /* list of receive buffer entries */
200 SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
201 unsigned int current_rx_buf;
202
203 unsigned int tx_buf_count; /* count of total allocated Tx buffers */
204 SCADESC *tx_buf_list; /* list of transmit buffer entries */
205 SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
206 unsigned int last_tx_buf;
207
208 unsigned char *tmp_rx_buf;
209 unsigned int tmp_rx_buf_count;
210
211 bool rx_enabled;
212 bool rx_overflow;
213
214 bool tx_enabled;
215 bool tx_active;
216 u32 idle_mode;
217
218 unsigned char ie0_value;
219 unsigned char ie1_value;
220 unsigned char ie2_value;
221 unsigned char ctrlreg_value;
222 unsigned char old_signals;
223
224 char device_name[25]; /* device instance name */
225
226 int port_count;
227 int adapter_num;
228 int port_num;
229
230 struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
231
232 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
233
234 unsigned int irq_level; /* interrupt level */
235 unsigned long irq_flags;
236 bool irq_requested; /* true if IRQ requested */
237
238 MGSL_PARAMS params; /* communications parameters */
239
240 unsigned char serial_signals; /* current serial signal states */
241
242 bool irq_occurred; /* for diagnostics use */
243 unsigned int init_error; /* Initialization startup error */
244
245 u32 last_mem_alloc;
246 unsigned char* memory_base; /* shared memory address (PCI only) */
247 u32 phys_memory_base;
248 int shared_mem_requested;
249
250 unsigned char* sca_base; /* HD64570 SCA Memory address */
251 u32 phys_sca_base;
252 u32 sca_offset;
253 bool sca_base_requested;
254
255 unsigned char* lcr_base; /* local config registers (PCI only) */
256 u32 phys_lcr_base;
257 u32 lcr_offset;
258 int lcr_mem_requested;
259
260 unsigned char* statctrl_base; /* status/control register memory */
261 u32 phys_statctrl_base;
262 u32 statctrl_offset;
263 bool sca_statctrl_requested;
264
265 u32 misc_ctrl_value;
266 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
267 char char_buf[MAX_ASYNC_BUFFER_SIZE];
268 bool drop_rts_on_tx_done;
269
270 struct _input_signal_events input_signal_events;
271
272 /* SPPP/Cisco HDLC device parts */
273 int netcount;
274 spinlock_t netlock;
275
276 #if SYNCLINK_GENERIC_HDLC
277 struct net_device *netdev;
278 #endif
279
280 } SLMP_INFO;
281
282 #define MGSL_MAGIC 0x5401
283
284 /*
285 * define serial signal status change macros
286 */
287 #define MISCSTATUS_DCD_LATCHED (SerialSignal_DCD<<8) /* indicates change in DCD */
288 #define MISCSTATUS_RI_LATCHED (SerialSignal_RI<<8) /* indicates change in RI */
289 #define MISCSTATUS_CTS_LATCHED (SerialSignal_CTS<<8) /* indicates change in CTS */
290 #define MISCSTATUS_DSR_LATCHED (SerialSignal_DSR<<8) /* change in DSR */
291
292 /* Common Register macros */
293 #define LPR 0x00
294 #define PABR0 0x02
295 #define PABR1 0x03
296 #define WCRL 0x04
297 #define WCRM 0x05
298 #define WCRH 0x06
299 #define DPCR 0x08
300 #define DMER 0x09
301 #define ISR0 0x10
302 #define ISR1 0x11
303 #define ISR2 0x12
304 #define IER0 0x14
305 #define IER1 0x15
306 #define IER2 0x16
307 #define ITCR 0x18
308 #define INTVR 0x1a
309 #define IMVR 0x1c
310
311 /* MSCI Register macros */
312 #define TRB 0x20
313 #define TRBL 0x20
314 #define TRBH 0x21
315 #define SR0 0x22
316 #define SR1 0x23
317 #define SR2 0x24
318 #define SR3 0x25
319 #define FST 0x26
320 #define IE0 0x28
321 #define IE1 0x29
322 #define IE2 0x2a
323 #define FIE 0x2b
324 #define CMD 0x2c
325 #define MD0 0x2e
326 #define MD1 0x2f
327 #define MD2 0x30
328 #define CTL 0x31
329 #define SA0 0x32
330 #define SA1 0x33
331 #define IDL 0x34
332 #define TMC 0x35
333 #define RXS 0x36
334 #define TXS 0x37
335 #define TRC0 0x38
336 #define TRC1 0x39
337 #define RRC 0x3a
338 #define CST0 0x3c
339 #define CST1 0x3d
340
341 /* Timer Register Macros */
342 #define TCNT 0x60
343 #define TCNTL 0x60
344 #define TCNTH 0x61
345 #define TCONR 0x62
346 #define TCONRL 0x62
347 #define TCONRH 0x63
348 #define TMCS 0x64
349 #define TEPR 0x65
350
351 /* DMA Controller Register macros */
352 #define DARL 0x80
353 #define DARH 0x81
354 #define DARB 0x82
355 #define BAR 0x80
356 #define BARL 0x80
357 #define BARH 0x81
358 #define BARB 0x82
359 #define SAR 0x84
360 #define SARL 0x84
361 #define SARH 0x85
362 #define SARB 0x86
363 #define CPB 0x86
364 #define CDA 0x88
365 #define CDAL 0x88
366 #define CDAH 0x89
367 #define EDA 0x8a
368 #define EDAL 0x8a
369 #define EDAH 0x8b
370 #define BFL 0x8c
371 #define BFLL 0x8c
372 #define BFLH 0x8d
373 #define BCR 0x8e
374 #define BCRL 0x8e
375 #define BCRH 0x8f
376 #define DSR 0x90
377 #define DMR 0x91
378 #define FCT 0x93
379 #define DIR 0x94
380 #define DCMD 0x95
381
382 /* combine with timer or DMA register address */
383 #define TIMER0 0x00
384 #define TIMER1 0x08
385 #define TIMER2 0x10
386 #define TIMER3 0x18
387 #define RXDMA 0x00
388 #define TXDMA 0x20
389
390 /* SCA Command Codes */
391 #define NOOP 0x00
392 #define TXRESET 0x01
393 #define TXENABLE 0x02
394 #define TXDISABLE 0x03
395 #define TXCRCINIT 0x04
396 #define TXCRCEXCL 0x05
397 #define TXEOM 0x06
398 #define TXABORT 0x07
399 #define MPON 0x08
400 #define TXBUFCLR 0x09
401 #define RXRESET 0x11
402 #define RXENABLE 0x12
403 #define RXDISABLE 0x13
404 #define RXCRCINIT 0x14
405 #define RXREJECT 0x15
406 #define SEARCHMP 0x16
407 #define RXCRCEXCL 0x17
408 #define RXCRCCALC 0x18
409 #define CHRESET 0x21
410 #define HUNT 0x31
411
412 /* DMA command codes */
413 #define SWABORT 0x01
414 #define FEICLEAR 0x02
415
416 /* IE0 */
417 #define TXINTE BIT7
418 #define RXINTE BIT6
419 #define TXRDYE BIT1
420 #define RXRDYE BIT0
421
422 /* IE1 & SR1 */
423 #define UDRN BIT7
424 #define IDLE BIT6
425 #define SYNCD BIT4
426 #define FLGD BIT4
427 #define CCTS BIT3
428 #define CDCD BIT2
429 #define BRKD BIT1
430 #define ABTD BIT1
431 #define GAPD BIT1
432 #define BRKE BIT0
433 #define IDLD BIT0
434
435 /* IE2 & SR2 */
436 #define EOM BIT7
437 #define PMP BIT6
438 #define SHRT BIT6
439 #define PE BIT5
440 #define ABT BIT5
441 #define FRME BIT4
442 #define RBIT BIT4
443 #define OVRN BIT3
444 #define CRCE BIT2
445
446
447 /*
448 * Global linked list of SyncLink devices
449 */
450 static SLMP_INFO *synclinkmp_device_list = NULL;
451 static int synclinkmp_adapter_count = -1;
452 static int synclinkmp_device_count = 0;
453
454 /*
455 * Set this param to non-zero to load eax with the
456 * .text section address and breakpoint on module load.
457 * This is useful for use with gdb and add-symbol-file command.
458 */
459 static bool break_on_load = 0;
460
461 /*
462 * Driver major number, defaults to zero to get auto
463 * assigned major number. May be forced as module parameter.
464 */
465 static int ttymajor = 0;
466
467 /*
468 * Array of user specified options for ISA adapters.
469 */
470 static int debug_level = 0;
471 static int maxframe[MAX_DEVICES] = {0,};
472
473 module_param(break_on_load, bool, 0);
474 module_param(ttymajor, int, 0);
475 module_param(debug_level, int, 0);
476 module_param_array(maxframe, int, NULL, 0);
477
478 static char *driver_name = "SyncLink MultiPort driver";
479 static char *driver_version = "$Revision: 4.38 $";
480
481 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
482 static void synclinkmp_remove_one(struct pci_dev *dev);
483
484 static struct pci_device_id synclinkmp_pci_tbl[] = {
485 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
486 { 0, }, /* terminate list */
487 };
488 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
489
490 MODULE_LICENSE("GPL");
491
492 static struct pci_driver synclinkmp_pci_driver = {
493 .name = "synclinkmp",
494 .id_table = synclinkmp_pci_tbl,
495 .probe = synclinkmp_init_one,
496 .remove = __devexit_p(synclinkmp_remove_one),
497 };
498
499
500 static struct tty_driver *serial_driver;
501
502 /* number of characters left in xmit buffer before we ask for more */
503 #define WAKEUP_CHARS 256
504
505
506 /* tty callbacks */
507
508 static int open(struct tty_struct *tty, struct file * filp);
509 static void close(struct tty_struct *tty, struct file * filp);
510 static void hangup(struct tty_struct *tty);
511 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
512
513 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
514 static int put_char(struct tty_struct *tty, unsigned char ch);
515 static void send_xchar(struct tty_struct *tty, char ch);
516 static void wait_until_sent(struct tty_struct *tty, int timeout);
517 static int write_room(struct tty_struct *tty);
518 static void flush_chars(struct tty_struct *tty);
519 static void flush_buffer(struct tty_struct *tty);
520 static void tx_hold(struct tty_struct *tty);
521 static void tx_release(struct tty_struct *tty);
522
523 static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
524 static int chars_in_buffer(struct tty_struct *tty);
525 static void throttle(struct tty_struct * tty);
526 static void unthrottle(struct tty_struct * tty);
527 static int set_break(struct tty_struct *tty, int break_state);
528
529 #if SYNCLINK_GENERIC_HDLC
530 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
531 static void hdlcdev_tx_done(SLMP_INFO *info);
532 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
533 static int hdlcdev_init(SLMP_INFO *info);
534 static void hdlcdev_exit(SLMP_INFO *info);
535 #endif
536
537 /* ioctl handlers */
538
539 static int get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
540 static int get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
541 static int set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
542 static int get_txidle(SLMP_INFO *info, int __user *idle_mode);
543 static int set_txidle(SLMP_INFO *info, int idle_mode);
544 static int tx_enable(SLMP_INFO *info, int enable);
545 static int tx_abort(SLMP_INFO *info);
546 static int rx_enable(SLMP_INFO *info, int enable);
547 static int modem_input_wait(SLMP_INFO *info,int arg);
548 static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
549 static int tiocmget(struct tty_struct *tty);
550 static int tiocmset(struct tty_struct *tty,
551 unsigned int set, unsigned int clear);
552 static int set_break(struct tty_struct *tty, int break_state);
553
554 static void add_device(SLMP_INFO *info);
555 static void device_init(int adapter_num, struct pci_dev *pdev);
556 static int claim_resources(SLMP_INFO *info);
557 static void release_resources(SLMP_INFO *info);
558
559 static int startup(SLMP_INFO *info);
560 static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
561 static int carrier_raised(struct tty_port *port);
562 static void shutdown(SLMP_INFO *info);
563 static void program_hw(SLMP_INFO *info);
564 static void change_params(SLMP_INFO *info);
565
566 static bool init_adapter(SLMP_INFO *info);
567 static bool register_test(SLMP_INFO *info);
568 static bool irq_test(SLMP_INFO *info);
569 static bool loopback_test(SLMP_INFO *info);
570 static int adapter_test(SLMP_INFO *info);
571 static bool memory_test(SLMP_INFO *info);
572
573 static void reset_adapter(SLMP_INFO *info);
574 static void reset_port(SLMP_INFO *info);
575 static void async_mode(SLMP_INFO *info);
576 static void hdlc_mode(SLMP_INFO *info);
577
578 static void rx_stop(SLMP_INFO *info);
579 static void rx_start(SLMP_INFO *info);
580 static void rx_reset_buffers(SLMP_INFO *info);
581 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
582 static bool rx_get_frame(SLMP_INFO *info);
583
584 static void tx_start(SLMP_INFO *info);
585 static void tx_stop(SLMP_INFO *info);
586 static void tx_load_fifo(SLMP_INFO *info);
587 static void tx_set_idle(SLMP_INFO *info);
588 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
589
590 static void get_signals(SLMP_INFO *info);
591 static void set_signals(SLMP_INFO *info);
592 static void enable_loopback(SLMP_INFO *info, int enable);
593 static void set_rate(SLMP_INFO *info, u32 data_rate);
594
595 static int bh_action(SLMP_INFO *info);
596 static void bh_handler(struct work_struct *work);
597 static void bh_receive(SLMP_INFO *info);
598 static void bh_transmit(SLMP_INFO *info);
599 static void bh_status(SLMP_INFO *info);
600 static void isr_timer(SLMP_INFO *info);
601 static void isr_rxint(SLMP_INFO *info);
602 static void isr_rxrdy(SLMP_INFO *info);
603 static void isr_txint(SLMP_INFO *info);
604 static void isr_txrdy(SLMP_INFO *info);
605 static void isr_rxdmaok(SLMP_INFO *info);
606 static void isr_rxdmaerror(SLMP_INFO *info);
607 static void isr_txdmaok(SLMP_INFO *info);
608 static void isr_txdmaerror(SLMP_INFO *info);
609 static void isr_io_pin(SLMP_INFO *info, u16 status);
610
611 static int alloc_dma_bufs(SLMP_INFO *info);
612 static void free_dma_bufs(SLMP_INFO *info);
613 static int alloc_buf_list(SLMP_INFO *info);
614 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
615 static int alloc_tmp_rx_buf(SLMP_INFO *info);
616 static void free_tmp_rx_buf(SLMP_INFO *info);
617
618 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
619 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
620 static void tx_timeout(unsigned long context);
621 static void status_timeout(unsigned long context);
622
623 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
624 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
625 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
626 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
627 static unsigned char read_status_reg(SLMP_INFO * info);
628 static void write_control_reg(SLMP_INFO * info);
629
630
631 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
632 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
633 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
634
635 static u32 misc_ctrl_value = 0x007e4040;
636 static u32 lcr1_brdr_value = 0x00800028;
637
638 static u32 read_ahead_count = 8;
639
640 /* DPCR, DMA Priority Control
641 *
642 * 07..05 Not used, must be 0
643 * 04 BRC, bus release condition: 0=all transfers complete
644 * 1=release after 1 xfer on all channels
645 * 03 CCC, channel change condition: 0=every cycle
646 * 1=after each channel completes all xfers
647 * 02..00 PR<2..0>, priority 100=round robin
648 *
649 * 00000100 = 0x00
650 */
651 static unsigned char dma_priority = 0x04;
652
653 // Number of bytes that can be written to shared RAM
654 // in a single write operation
655 static u32 sca_pci_load_interval = 64;
656
657 /*
658 * 1st function defined in .text section. Calling this function in
659 * init_module() followed by a breakpoint allows a remote debugger
660 * (gdb) to get the .text address for the add-symbol-file command.
661 * This allows remote debugging of dynamically loadable modules.
662 */
663 static void* synclinkmp_get_text_ptr(void);
synclinkmp_get_text_ptr(void)664 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
665
sanity_check(SLMP_INFO * info,char * name,const char * routine)666 static inline int sanity_check(SLMP_INFO *info,
667 char *name, const char *routine)
668 {
669 #ifdef SANITY_CHECK
670 static const char *badmagic =
671 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
672 static const char *badinfo =
673 "Warning: null synclinkmp_struct for (%s) in %s\n";
674
675 if (!info) {
676 printk(badinfo, name, routine);
677 return 1;
678 }
679 if (info->magic != MGSL_MAGIC) {
680 printk(badmagic, name, routine);
681 return 1;
682 }
683 #else
684 if (!info)
685 return 1;
686 #endif
687 return 0;
688 }
689
690 /**
691 * line discipline callback wrappers
692 *
693 * The wrappers maintain line discipline references
694 * while calling into the line discipline.
695 *
696 * ldisc_receive_buf - pass receive data to line discipline
697 */
698
ldisc_receive_buf(struct tty_struct * tty,const __u8 * data,char * flags,int count)699 static void ldisc_receive_buf(struct tty_struct *tty,
700 const __u8 *data, char *flags, int count)
701 {
702 struct tty_ldisc *ld;
703 if (!tty)
704 return;
705 ld = tty_ldisc_ref(tty);
706 if (ld) {
707 if (ld->ops->receive_buf)
708 ld->ops->receive_buf(tty, data, flags, count);
709 tty_ldisc_deref(ld);
710 }
711 }
712
713 /* tty callbacks */
714
715 /* Called when a port is opened. Init and enable port.
716 */
open(struct tty_struct * tty,struct file * filp)717 static int open(struct tty_struct *tty, struct file *filp)
718 {
719 SLMP_INFO *info;
720 int retval, line;
721 unsigned long flags;
722
723 line = tty->index;
724 if ((line < 0) || (line >= synclinkmp_device_count)) {
725 printk("%s(%d): open with invalid line #%d.\n",
726 __FILE__,__LINE__,line);
727 return -ENODEV;
728 }
729
730 info = synclinkmp_device_list;
731 while(info && info->line != line)
732 info = info->next_device;
733 if (sanity_check(info, tty->name, "open"))
734 return -ENODEV;
735 if ( info->init_error ) {
736 printk("%s(%d):%s device is not allocated, init error=%d\n",
737 __FILE__,__LINE__,info->device_name,info->init_error);
738 return -ENODEV;
739 }
740
741 tty->driver_data = info;
742 info->port.tty = tty;
743
744 if (debug_level >= DEBUG_LEVEL_INFO)
745 printk("%s(%d):%s open(), old ref count = %d\n",
746 __FILE__,__LINE__,tty->driver->name, info->port.count);
747
748 /* If port is closing, signal caller to try again */
749 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
750 if (info->port.flags & ASYNC_CLOSING)
751 interruptible_sleep_on(&info->port.close_wait);
752 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
753 -EAGAIN : -ERESTARTSYS);
754 goto cleanup;
755 }
756
757 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
758
759 spin_lock_irqsave(&info->netlock, flags);
760 if (info->netcount) {
761 retval = -EBUSY;
762 spin_unlock_irqrestore(&info->netlock, flags);
763 goto cleanup;
764 }
765 info->port.count++;
766 spin_unlock_irqrestore(&info->netlock, flags);
767
768 if (info->port.count == 1) {
769 /* 1st open on this device, init hardware */
770 retval = startup(info);
771 if (retval < 0)
772 goto cleanup;
773 }
774
775 retval = block_til_ready(tty, filp, info);
776 if (retval) {
777 if (debug_level >= DEBUG_LEVEL_INFO)
778 printk("%s(%d):%s block_til_ready() returned %d\n",
779 __FILE__,__LINE__, info->device_name, retval);
780 goto cleanup;
781 }
782
783 if (debug_level >= DEBUG_LEVEL_INFO)
784 printk("%s(%d):%s open() success\n",
785 __FILE__,__LINE__, info->device_name);
786 retval = 0;
787
788 cleanup:
789 if (retval) {
790 if (tty->count == 1)
791 info->port.tty = NULL; /* tty layer will release tty struct */
792 if(info->port.count)
793 info->port.count--;
794 }
795
796 return retval;
797 }
798
799 /* Called when port is closed. Wait for remaining data to be
800 * sent. Disable port and free resources.
801 */
close(struct tty_struct * tty,struct file * filp)802 static void close(struct tty_struct *tty, struct file *filp)
803 {
804 SLMP_INFO * info = tty->driver_data;
805
806 if (sanity_check(info, tty->name, "close"))
807 return;
808
809 if (debug_level >= DEBUG_LEVEL_INFO)
810 printk("%s(%d):%s close() entry, count=%d\n",
811 __FILE__,__LINE__, info->device_name, info->port.count);
812
813 if (tty_port_close_start(&info->port, tty, filp) == 0)
814 goto cleanup;
815
816 mutex_lock(&info->port.mutex);
817 if (info->port.flags & ASYNC_INITIALIZED)
818 wait_until_sent(tty, info->timeout);
819
820 flush_buffer(tty);
821 tty_ldisc_flush(tty);
822 shutdown(info);
823 mutex_unlock(&info->port.mutex);
824
825 tty_port_close_end(&info->port, tty);
826 info->port.tty = NULL;
827 cleanup:
828 if (debug_level >= DEBUG_LEVEL_INFO)
829 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
830 tty->driver->name, info->port.count);
831 }
832
833 /* Called by tty_hangup() when a hangup is signaled.
834 * This is the same as closing all open descriptors for the port.
835 */
hangup(struct tty_struct * tty)836 static void hangup(struct tty_struct *tty)
837 {
838 SLMP_INFO *info = tty->driver_data;
839 unsigned long flags;
840
841 if (debug_level >= DEBUG_LEVEL_INFO)
842 printk("%s(%d):%s hangup()\n",
843 __FILE__,__LINE__, info->device_name );
844
845 if (sanity_check(info, tty->name, "hangup"))
846 return;
847
848 mutex_lock(&info->port.mutex);
849 flush_buffer(tty);
850 shutdown(info);
851
852 spin_lock_irqsave(&info->port.lock, flags);
853 info->port.count = 0;
854 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
855 info->port.tty = NULL;
856 spin_unlock_irqrestore(&info->port.lock, flags);
857 mutex_unlock(&info->port.mutex);
858
859 wake_up_interruptible(&info->port.open_wait);
860 }
861
862 /* Set new termios settings
863 */
set_termios(struct tty_struct * tty,struct ktermios * old_termios)864 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
865 {
866 SLMP_INFO *info = tty->driver_data;
867 unsigned long flags;
868
869 if (debug_level >= DEBUG_LEVEL_INFO)
870 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
871 tty->driver->name );
872
873 change_params(info);
874
875 /* Handle transition to B0 status */
876 if (old_termios->c_cflag & CBAUD &&
877 !(tty->termios->c_cflag & CBAUD)) {
878 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
879 spin_lock_irqsave(&info->lock,flags);
880 set_signals(info);
881 spin_unlock_irqrestore(&info->lock,flags);
882 }
883
884 /* Handle transition away from B0 status */
885 if (!(old_termios->c_cflag & CBAUD) &&
886 tty->termios->c_cflag & CBAUD) {
887 info->serial_signals |= SerialSignal_DTR;
888 if (!(tty->termios->c_cflag & CRTSCTS) ||
889 !test_bit(TTY_THROTTLED, &tty->flags)) {
890 info->serial_signals |= SerialSignal_RTS;
891 }
892 spin_lock_irqsave(&info->lock,flags);
893 set_signals(info);
894 spin_unlock_irqrestore(&info->lock,flags);
895 }
896
897 /* Handle turning off CRTSCTS */
898 if (old_termios->c_cflag & CRTSCTS &&
899 !(tty->termios->c_cflag & CRTSCTS)) {
900 tty->hw_stopped = 0;
901 tx_release(tty);
902 }
903 }
904
905 /* Send a block of data
906 *
907 * Arguments:
908 *
909 * tty pointer to tty information structure
910 * buf pointer to buffer containing send data
911 * count size of send data in bytes
912 *
913 * Return Value: number of characters written
914 */
write(struct tty_struct * tty,const unsigned char * buf,int count)915 static int write(struct tty_struct *tty,
916 const unsigned char *buf, int count)
917 {
918 int c, ret = 0;
919 SLMP_INFO *info = tty->driver_data;
920 unsigned long flags;
921
922 if (debug_level >= DEBUG_LEVEL_INFO)
923 printk("%s(%d):%s write() count=%d\n",
924 __FILE__,__LINE__,info->device_name,count);
925
926 if (sanity_check(info, tty->name, "write"))
927 goto cleanup;
928
929 if (!info->tx_buf)
930 goto cleanup;
931
932 if (info->params.mode == MGSL_MODE_HDLC) {
933 if (count > info->max_frame_size) {
934 ret = -EIO;
935 goto cleanup;
936 }
937 if (info->tx_active)
938 goto cleanup;
939 if (info->tx_count) {
940 /* send accumulated data from send_char() calls */
941 /* as frame and wait before accepting more data. */
942 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
943 goto start;
944 }
945 ret = info->tx_count = count;
946 tx_load_dma_buffer(info, buf, count);
947 goto start;
948 }
949
950 for (;;) {
951 c = min_t(int, count,
952 min(info->max_frame_size - info->tx_count - 1,
953 info->max_frame_size - info->tx_put));
954 if (c <= 0)
955 break;
956
957 memcpy(info->tx_buf + info->tx_put, buf, c);
958
959 spin_lock_irqsave(&info->lock,flags);
960 info->tx_put += c;
961 if (info->tx_put >= info->max_frame_size)
962 info->tx_put -= info->max_frame_size;
963 info->tx_count += c;
964 spin_unlock_irqrestore(&info->lock,flags);
965
966 buf += c;
967 count -= c;
968 ret += c;
969 }
970
971 if (info->params.mode == MGSL_MODE_HDLC) {
972 if (count) {
973 ret = info->tx_count = 0;
974 goto cleanup;
975 }
976 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
977 }
978 start:
979 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
980 spin_lock_irqsave(&info->lock,flags);
981 if (!info->tx_active)
982 tx_start(info);
983 spin_unlock_irqrestore(&info->lock,flags);
984 }
985
986 cleanup:
987 if (debug_level >= DEBUG_LEVEL_INFO)
988 printk( "%s(%d):%s write() returning=%d\n",
989 __FILE__,__LINE__,info->device_name,ret);
990 return ret;
991 }
992
993 /* Add a character to the transmit buffer.
994 */
put_char(struct tty_struct * tty,unsigned char ch)995 static int put_char(struct tty_struct *tty, unsigned char ch)
996 {
997 SLMP_INFO *info = tty->driver_data;
998 unsigned long flags;
999 int ret = 0;
1000
1001 if ( debug_level >= DEBUG_LEVEL_INFO ) {
1002 printk( "%s(%d):%s put_char(%d)\n",
1003 __FILE__,__LINE__,info->device_name,ch);
1004 }
1005
1006 if (sanity_check(info, tty->name, "put_char"))
1007 return 0;
1008
1009 if (!info->tx_buf)
1010 return 0;
1011
1012 spin_lock_irqsave(&info->lock,flags);
1013
1014 if ( (info->params.mode != MGSL_MODE_HDLC) ||
1015 !info->tx_active ) {
1016
1017 if (info->tx_count < info->max_frame_size - 1) {
1018 info->tx_buf[info->tx_put++] = ch;
1019 if (info->tx_put >= info->max_frame_size)
1020 info->tx_put -= info->max_frame_size;
1021 info->tx_count++;
1022 ret = 1;
1023 }
1024 }
1025
1026 spin_unlock_irqrestore(&info->lock,flags);
1027 return ret;
1028 }
1029
1030 /* Send a high-priority XON/XOFF character
1031 */
send_xchar(struct tty_struct * tty,char ch)1032 static void send_xchar(struct tty_struct *tty, char ch)
1033 {
1034 SLMP_INFO *info = tty->driver_data;
1035 unsigned long flags;
1036
1037 if (debug_level >= DEBUG_LEVEL_INFO)
1038 printk("%s(%d):%s send_xchar(%d)\n",
1039 __FILE__,__LINE__, info->device_name, ch );
1040
1041 if (sanity_check(info, tty->name, "send_xchar"))
1042 return;
1043
1044 info->x_char = ch;
1045 if (ch) {
1046 /* Make sure transmit interrupts are on */
1047 spin_lock_irqsave(&info->lock,flags);
1048 if (!info->tx_enabled)
1049 tx_start(info);
1050 spin_unlock_irqrestore(&info->lock,flags);
1051 }
1052 }
1053
1054 /* Wait until the transmitter is empty.
1055 */
wait_until_sent(struct tty_struct * tty,int timeout)1056 static void wait_until_sent(struct tty_struct *tty, int timeout)
1057 {
1058 SLMP_INFO * info = tty->driver_data;
1059 unsigned long orig_jiffies, char_time;
1060
1061 if (!info )
1062 return;
1063
1064 if (debug_level >= DEBUG_LEVEL_INFO)
1065 printk("%s(%d):%s wait_until_sent() entry\n",
1066 __FILE__,__LINE__, info->device_name );
1067
1068 if (sanity_check(info, tty->name, "wait_until_sent"))
1069 return;
1070
1071 if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
1072 goto exit;
1073
1074 orig_jiffies = jiffies;
1075
1076 /* Set check interval to 1/5 of estimated time to
1077 * send a character, and make it at least 1. The check
1078 * interval should also be less than the timeout.
1079 * Note: use tight timings here to satisfy the NIST-PCTS.
1080 */
1081
1082 if ( info->params.data_rate ) {
1083 char_time = info->timeout/(32 * 5);
1084 if (!char_time)
1085 char_time++;
1086 } else
1087 char_time = 1;
1088
1089 if (timeout)
1090 char_time = min_t(unsigned long, char_time, timeout);
1091
1092 if ( info->params.mode == MGSL_MODE_HDLC ) {
1093 while (info->tx_active) {
1094 msleep_interruptible(jiffies_to_msecs(char_time));
1095 if (signal_pending(current))
1096 break;
1097 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1098 break;
1099 }
1100 } else {
1101 /*
1102 * TODO: determine if there is something similar to USC16C32
1103 * TXSTATUS_ALL_SENT status
1104 */
1105 while ( info->tx_active && info->tx_enabled) {
1106 msleep_interruptible(jiffies_to_msecs(char_time));
1107 if (signal_pending(current))
1108 break;
1109 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1110 break;
1111 }
1112 }
1113
1114 exit:
1115 if (debug_level >= DEBUG_LEVEL_INFO)
1116 printk("%s(%d):%s wait_until_sent() exit\n",
1117 __FILE__,__LINE__, info->device_name );
1118 }
1119
1120 /* Return the count of free bytes in transmit buffer
1121 */
write_room(struct tty_struct * tty)1122 static int write_room(struct tty_struct *tty)
1123 {
1124 SLMP_INFO *info = tty->driver_data;
1125 int ret;
1126
1127 if (sanity_check(info, tty->name, "write_room"))
1128 return 0;
1129
1130 if (info->params.mode == MGSL_MODE_HDLC) {
1131 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1132 } else {
1133 ret = info->max_frame_size - info->tx_count - 1;
1134 if (ret < 0)
1135 ret = 0;
1136 }
1137
1138 if (debug_level >= DEBUG_LEVEL_INFO)
1139 printk("%s(%d):%s write_room()=%d\n",
1140 __FILE__, __LINE__, info->device_name, ret);
1141
1142 return ret;
1143 }
1144
1145 /* enable transmitter and send remaining buffered characters
1146 */
flush_chars(struct tty_struct * tty)1147 static void flush_chars(struct tty_struct *tty)
1148 {
1149 SLMP_INFO *info = tty->driver_data;
1150 unsigned long flags;
1151
1152 if ( debug_level >= DEBUG_LEVEL_INFO )
1153 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1154 __FILE__,__LINE__,info->device_name,info->tx_count);
1155
1156 if (sanity_check(info, tty->name, "flush_chars"))
1157 return;
1158
1159 if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1160 !info->tx_buf)
1161 return;
1162
1163 if ( debug_level >= DEBUG_LEVEL_INFO )
1164 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1165 __FILE__,__LINE__,info->device_name );
1166
1167 spin_lock_irqsave(&info->lock,flags);
1168
1169 if (!info->tx_active) {
1170 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1171 info->tx_count ) {
1172 /* operating in synchronous (frame oriented) mode */
1173 /* copy data from circular tx_buf to */
1174 /* transmit DMA buffer. */
1175 tx_load_dma_buffer(info,
1176 info->tx_buf,info->tx_count);
1177 }
1178 tx_start(info);
1179 }
1180
1181 spin_unlock_irqrestore(&info->lock,flags);
1182 }
1183
1184 /* Discard all data in the send buffer
1185 */
flush_buffer(struct tty_struct * tty)1186 static void flush_buffer(struct tty_struct *tty)
1187 {
1188 SLMP_INFO *info = tty->driver_data;
1189 unsigned long flags;
1190
1191 if (debug_level >= DEBUG_LEVEL_INFO)
1192 printk("%s(%d):%s flush_buffer() entry\n",
1193 __FILE__,__LINE__, info->device_name );
1194
1195 if (sanity_check(info, tty->name, "flush_buffer"))
1196 return;
1197
1198 spin_lock_irqsave(&info->lock,flags);
1199 info->tx_count = info->tx_put = info->tx_get = 0;
1200 del_timer(&info->tx_timer);
1201 spin_unlock_irqrestore(&info->lock,flags);
1202
1203 tty_wakeup(tty);
1204 }
1205
1206 /* throttle (stop) transmitter
1207 */
tx_hold(struct tty_struct * tty)1208 static void tx_hold(struct tty_struct *tty)
1209 {
1210 SLMP_INFO *info = tty->driver_data;
1211 unsigned long flags;
1212
1213 if (sanity_check(info, tty->name, "tx_hold"))
1214 return;
1215
1216 if ( debug_level >= DEBUG_LEVEL_INFO )
1217 printk("%s(%d):%s tx_hold()\n",
1218 __FILE__,__LINE__,info->device_name);
1219
1220 spin_lock_irqsave(&info->lock,flags);
1221 if (info->tx_enabled)
1222 tx_stop(info);
1223 spin_unlock_irqrestore(&info->lock,flags);
1224 }
1225
1226 /* release (start) transmitter
1227 */
tx_release(struct tty_struct * tty)1228 static void tx_release(struct tty_struct *tty)
1229 {
1230 SLMP_INFO *info = tty->driver_data;
1231 unsigned long flags;
1232
1233 if (sanity_check(info, tty->name, "tx_release"))
1234 return;
1235
1236 if ( debug_level >= DEBUG_LEVEL_INFO )
1237 printk("%s(%d):%s tx_release()\n",
1238 __FILE__,__LINE__,info->device_name);
1239
1240 spin_lock_irqsave(&info->lock,flags);
1241 if (!info->tx_enabled)
1242 tx_start(info);
1243 spin_unlock_irqrestore(&info->lock,flags);
1244 }
1245
1246 /* Service an IOCTL request
1247 *
1248 * Arguments:
1249 *
1250 * tty pointer to tty instance data
1251 * cmd IOCTL command code
1252 * arg command argument/context
1253 *
1254 * Return Value: 0 if success, otherwise error code
1255 */
ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1256 static int ioctl(struct tty_struct *tty,
1257 unsigned int cmd, unsigned long arg)
1258 {
1259 SLMP_INFO *info = tty->driver_data;
1260 void __user *argp = (void __user *)arg;
1261
1262 if (debug_level >= DEBUG_LEVEL_INFO)
1263 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1264 info->device_name, cmd );
1265
1266 if (sanity_check(info, tty->name, "ioctl"))
1267 return -ENODEV;
1268
1269 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1270 (cmd != TIOCMIWAIT)) {
1271 if (tty->flags & (1 << TTY_IO_ERROR))
1272 return -EIO;
1273 }
1274
1275 switch (cmd) {
1276 case MGSL_IOCGPARAMS:
1277 return get_params(info, argp);
1278 case MGSL_IOCSPARAMS:
1279 return set_params(info, argp);
1280 case MGSL_IOCGTXIDLE:
1281 return get_txidle(info, argp);
1282 case MGSL_IOCSTXIDLE:
1283 return set_txidle(info, (int)arg);
1284 case MGSL_IOCTXENABLE:
1285 return tx_enable(info, (int)arg);
1286 case MGSL_IOCRXENABLE:
1287 return rx_enable(info, (int)arg);
1288 case MGSL_IOCTXABORT:
1289 return tx_abort(info);
1290 case MGSL_IOCGSTATS:
1291 return get_stats(info, argp);
1292 case MGSL_IOCWAITEVENT:
1293 return wait_mgsl_event(info, argp);
1294 case MGSL_IOCLOOPTXDONE:
1295 return 0; // TODO: Not supported, need to document
1296 /* Wait for modem input (DCD,RI,DSR,CTS) change
1297 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1298 */
1299 case TIOCMIWAIT:
1300 return modem_input_wait(info,(int)arg);
1301
1302 /*
1303 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1304 * Return: write counters to the user passed counter struct
1305 * NB: both 1->0 and 0->1 transitions are counted except for
1306 * RI where only 0->1 is counted.
1307 */
1308 default:
1309 return -ENOIOCTLCMD;
1310 }
1311 return 0;
1312 }
1313
get_icount(struct tty_struct * tty,struct serial_icounter_struct * icount)1314 static int get_icount(struct tty_struct *tty,
1315 struct serial_icounter_struct *icount)
1316 {
1317 SLMP_INFO *info = tty->driver_data;
1318 struct mgsl_icount cnow; /* kernel counter temps */
1319 unsigned long flags;
1320
1321 spin_lock_irqsave(&info->lock,flags);
1322 cnow = info->icount;
1323 spin_unlock_irqrestore(&info->lock,flags);
1324
1325 icount->cts = cnow.cts;
1326 icount->dsr = cnow.dsr;
1327 icount->rng = cnow.rng;
1328 icount->dcd = cnow.dcd;
1329 icount->rx = cnow.rx;
1330 icount->tx = cnow.tx;
1331 icount->frame = cnow.frame;
1332 icount->overrun = cnow.overrun;
1333 icount->parity = cnow.parity;
1334 icount->brk = cnow.brk;
1335 icount->buf_overrun = cnow.buf_overrun;
1336
1337 return 0;
1338 }
1339
1340 /*
1341 * /proc fs routines....
1342 */
1343
line_info(struct seq_file * m,SLMP_INFO * info)1344 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1345 {
1346 char stat_buf[30];
1347 unsigned long flags;
1348
1349 seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1350 "\tIRQ=%d MaxFrameSize=%u\n",
1351 info->device_name,
1352 info->phys_sca_base,
1353 info->phys_memory_base,
1354 info->phys_statctrl_base,
1355 info->phys_lcr_base,
1356 info->irq_level,
1357 info->max_frame_size );
1358
1359 /* output current serial signal states */
1360 spin_lock_irqsave(&info->lock,flags);
1361 get_signals(info);
1362 spin_unlock_irqrestore(&info->lock,flags);
1363
1364 stat_buf[0] = 0;
1365 stat_buf[1] = 0;
1366 if (info->serial_signals & SerialSignal_RTS)
1367 strcat(stat_buf, "|RTS");
1368 if (info->serial_signals & SerialSignal_CTS)
1369 strcat(stat_buf, "|CTS");
1370 if (info->serial_signals & SerialSignal_DTR)
1371 strcat(stat_buf, "|DTR");
1372 if (info->serial_signals & SerialSignal_DSR)
1373 strcat(stat_buf, "|DSR");
1374 if (info->serial_signals & SerialSignal_DCD)
1375 strcat(stat_buf, "|CD");
1376 if (info->serial_signals & SerialSignal_RI)
1377 strcat(stat_buf, "|RI");
1378
1379 if (info->params.mode == MGSL_MODE_HDLC) {
1380 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1381 info->icount.txok, info->icount.rxok);
1382 if (info->icount.txunder)
1383 seq_printf(m, " txunder:%d", info->icount.txunder);
1384 if (info->icount.txabort)
1385 seq_printf(m, " txabort:%d", info->icount.txabort);
1386 if (info->icount.rxshort)
1387 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1388 if (info->icount.rxlong)
1389 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1390 if (info->icount.rxover)
1391 seq_printf(m, " rxover:%d", info->icount.rxover);
1392 if (info->icount.rxcrc)
1393 seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1394 } else {
1395 seq_printf(m, "\tASYNC tx:%d rx:%d",
1396 info->icount.tx, info->icount.rx);
1397 if (info->icount.frame)
1398 seq_printf(m, " fe:%d", info->icount.frame);
1399 if (info->icount.parity)
1400 seq_printf(m, " pe:%d", info->icount.parity);
1401 if (info->icount.brk)
1402 seq_printf(m, " brk:%d", info->icount.brk);
1403 if (info->icount.overrun)
1404 seq_printf(m, " oe:%d", info->icount.overrun);
1405 }
1406
1407 /* Append serial signal status to end */
1408 seq_printf(m, " %s\n", stat_buf+1);
1409
1410 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1411 info->tx_active,info->bh_requested,info->bh_running,
1412 info->pending_bh);
1413 }
1414
1415 /* Called to print information about devices
1416 */
synclinkmp_proc_show(struct seq_file * m,void * v)1417 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1418 {
1419 SLMP_INFO *info;
1420
1421 seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1422
1423 info = synclinkmp_device_list;
1424 while( info ) {
1425 line_info(m, info);
1426 info = info->next_device;
1427 }
1428 return 0;
1429 }
1430
synclinkmp_proc_open(struct inode * inode,struct file * file)1431 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1432 {
1433 return single_open(file, synclinkmp_proc_show, NULL);
1434 }
1435
1436 static const struct file_operations synclinkmp_proc_fops = {
1437 .owner = THIS_MODULE,
1438 .open = synclinkmp_proc_open,
1439 .read = seq_read,
1440 .llseek = seq_lseek,
1441 .release = single_release,
1442 };
1443
1444 /* Return the count of bytes in transmit buffer
1445 */
chars_in_buffer(struct tty_struct * tty)1446 static int chars_in_buffer(struct tty_struct *tty)
1447 {
1448 SLMP_INFO *info = tty->driver_data;
1449
1450 if (sanity_check(info, tty->name, "chars_in_buffer"))
1451 return 0;
1452
1453 if (debug_level >= DEBUG_LEVEL_INFO)
1454 printk("%s(%d):%s chars_in_buffer()=%d\n",
1455 __FILE__, __LINE__, info->device_name, info->tx_count);
1456
1457 return info->tx_count;
1458 }
1459
1460 /* Signal remote device to throttle send data (our receive data)
1461 */
throttle(struct tty_struct * tty)1462 static void throttle(struct tty_struct * tty)
1463 {
1464 SLMP_INFO *info = tty->driver_data;
1465 unsigned long flags;
1466
1467 if (debug_level >= DEBUG_LEVEL_INFO)
1468 printk("%s(%d):%s throttle() entry\n",
1469 __FILE__,__LINE__, info->device_name );
1470
1471 if (sanity_check(info, tty->name, "throttle"))
1472 return;
1473
1474 if (I_IXOFF(tty))
1475 send_xchar(tty, STOP_CHAR(tty));
1476
1477 if (tty->termios->c_cflag & CRTSCTS) {
1478 spin_lock_irqsave(&info->lock,flags);
1479 info->serial_signals &= ~SerialSignal_RTS;
1480 set_signals(info);
1481 spin_unlock_irqrestore(&info->lock,flags);
1482 }
1483 }
1484
1485 /* Signal remote device to stop throttling send data (our receive data)
1486 */
unthrottle(struct tty_struct * tty)1487 static void unthrottle(struct tty_struct * tty)
1488 {
1489 SLMP_INFO *info = tty->driver_data;
1490 unsigned long flags;
1491
1492 if (debug_level >= DEBUG_LEVEL_INFO)
1493 printk("%s(%d):%s unthrottle() entry\n",
1494 __FILE__,__LINE__, info->device_name );
1495
1496 if (sanity_check(info, tty->name, "unthrottle"))
1497 return;
1498
1499 if (I_IXOFF(tty)) {
1500 if (info->x_char)
1501 info->x_char = 0;
1502 else
1503 send_xchar(tty, START_CHAR(tty));
1504 }
1505
1506 if (tty->termios->c_cflag & CRTSCTS) {
1507 spin_lock_irqsave(&info->lock,flags);
1508 info->serial_signals |= SerialSignal_RTS;
1509 set_signals(info);
1510 spin_unlock_irqrestore(&info->lock,flags);
1511 }
1512 }
1513
1514 /* set or clear transmit break condition
1515 * break_state -1=set break condition, 0=clear
1516 */
set_break(struct tty_struct * tty,int break_state)1517 static int set_break(struct tty_struct *tty, int break_state)
1518 {
1519 unsigned char RegValue;
1520 SLMP_INFO * info = tty->driver_data;
1521 unsigned long flags;
1522
1523 if (debug_level >= DEBUG_LEVEL_INFO)
1524 printk("%s(%d):%s set_break(%d)\n",
1525 __FILE__,__LINE__, info->device_name, break_state);
1526
1527 if (sanity_check(info, tty->name, "set_break"))
1528 return -EINVAL;
1529
1530 spin_lock_irqsave(&info->lock,flags);
1531 RegValue = read_reg(info, CTL);
1532 if (break_state == -1)
1533 RegValue |= BIT3;
1534 else
1535 RegValue &= ~BIT3;
1536 write_reg(info, CTL, RegValue);
1537 spin_unlock_irqrestore(&info->lock,flags);
1538 return 0;
1539 }
1540
1541 #if SYNCLINK_GENERIC_HDLC
1542
1543 /**
1544 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1545 * set encoding and frame check sequence (FCS) options
1546 *
1547 * dev pointer to network device structure
1548 * encoding serial encoding setting
1549 * parity FCS setting
1550 *
1551 * returns 0 if success, otherwise error code
1552 */
hdlcdev_attach(struct net_device * dev,unsigned short encoding,unsigned short parity)1553 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1554 unsigned short parity)
1555 {
1556 SLMP_INFO *info = dev_to_port(dev);
1557 unsigned char new_encoding;
1558 unsigned short new_crctype;
1559
1560 /* return error if TTY interface open */
1561 if (info->port.count)
1562 return -EBUSY;
1563
1564 switch (encoding)
1565 {
1566 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1567 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1568 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1569 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1570 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1571 default: return -EINVAL;
1572 }
1573
1574 switch (parity)
1575 {
1576 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1577 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1578 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1579 default: return -EINVAL;
1580 }
1581
1582 info->params.encoding = new_encoding;
1583 info->params.crc_type = new_crctype;
1584
1585 /* if network interface up, reprogram hardware */
1586 if (info->netcount)
1587 program_hw(info);
1588
1589 return 0;
1590 }
1591
1592 /**
1593 * called by generic HDLC layer to send frame
1594 *
1595 * skb socket buffer containing HDLC frame
1596 * dev pointer to network device structure
1597 */
hdlcdev_xmit(struct sk_buff * skb,struct net_device * dev)1598 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1599 struct net_device *dev)
1600 {
1601 SLMP_INFO *info = dev_to_port(dev);
1602 unsigned long flags;
1603
1604 if (debug_level >= DEBUG_LEVEL_INFO)
1605 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1606
1607 /* stop sending until this frame completes */
1608 netif_stop_queue(dev);
1609
1610 /* copy data to device buffers */
1611 info->tx_count = skb->len;
1612 tx_load_dma_buffer(info, skb->data, skb->len);
1613
1614 /* update network statistics */
1615 dev->stats.tx_packets++;
1616 dev->stats.tx_bytes += skb->len;
1617
1618 /* done with socket buffer, so free it */
1619 dev_kfree_skb(skb);
1620
1621 /* save start time for transmit timeout detection */
1622 dev->trans_start = jiffies;
1623
1624 /* start hardware transmitter if necessary */
1625 spin_lock_irqsave(&info->lock,flags);
1626 if (!info->tx_active)
1627 tx_start(info);
1628 spin_unlock_irqrestore(&info->lock,flags);
1629
1630 return NETDEV_TX_OK;
1631 }
1632
1633 /**
1634 * called by network layer when interface enabled
1635 * claim resources and initialize hardware
1636 *
1637 * dev pointer to network device structure
1638 *
1639 * returns 0 if success, otherwise error code
1640 */
hdlcdev_open(struct net_device * dev)1641 static int hdlcdev_open(struct net_device *dev)
1642 {
1643 SLMP_INFO *info = dev_to_port(dev);
1644 int rc;
1645 unsigned long flags;
1646
1647 if (debug_level >= DEBUG_LEVEL_INFO)
1648 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1649
1650 /* generic HDLC layer open processing */
1651 if ((rc = hdlc_open(dev)))
1652 return rc;
1653
1654 /* arbitrate between network and tty opens */
1655 spin_lock_irqsave(&info->netlock, flags);
1656 if (info->port.count != 0 || info->netcount != 0) {
1657 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1658 spin_unlock_irqrestore(&info->netlock, flags);
1659 return -EBUSY;
1660 }
1661 info->netcount=1;
1662 spin_unlock_irqrestore(&info->netlock, flags);
1663
1664 /* claim resources and init adapter */
1665 if ((rc = startup(info)) != 0) {
1666 spin_lock_irqsave(&info->netlock, flags);
1667 info->netcount=0;
1668 spin_unlock_irqrestore(&info->netlock, flags);
1669 return rc;
1670 }
1671
1672 /* assert DTR and RTS, apply hardware settings */
1673 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1674 program_hw(info);
1675
1676 /* enable network layer transmit */
1677 dev->trans_start = jiffies;
1678 netif_start_queue(dev);
1679
1680 /* inform generic HDLC layer of current DCD status */
1681 spin_lock_irqsave(&info->lock, flags);
1682 get_signals(info);
1683 spin_unlock_irqrestore(&info->lock, flags);
1684 if (info->serial_signals & SerialSignal_DCD)
1685 netif_carrier_on(dev);
1686 else
1687 netif_carrier_off(dev);
1688 return 0;
1689 }
1690
1691 /**
1692 * called by network layer when interface is disabled
1693 * shutdown hardware and release resources
1694 *
1695 * dev pointer to network device structure
1696 *
1697 * returns 0 if success, otherwise error code
1698 */
hdlcdev_close(struct net_device * dev)1699 static int hdlcdev_close(struct net_device *dev)
1700 {
1701 SLMP_INFO *info = dev_to_port(dev);
1702 unsigned long flags;
1703
1704 if (debug_level >= DEBUG_LEVEL_INFO)
1705 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1706
1707 netif_stop_queue(dev);
1708
1709 /* shutdown adapter and release resources */
1710 shutdown(info);
1711
1712 hdlc_close(dev);
1713
1714 spin_lock_irqsave(&info->netlock, flags);
1715 info->netcount=0;
1716 spin_unlock_irqrestore(&info->netlock, flags);
1717
1718 return 0;
1719 }
1720
1721 /**
1722 * called by network layer to process IOCTL call to network device
1723 *
1724 * dev pointer to network device structure
1725 * ifr pointer to network interface request structure
1726 * cmd IOCTL command code
1727 *
1728 * returns 0 if success, otherwise error code
1729 */
hdlcdev_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)1730 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1731 {
1732 const size_t size = sizeof(sync_serial_settings);
1733 sync_serial_settings new_line;
1734 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1735 SLMP_INFO *info = dev_to_port(dev);
1736 unsigned int flags;
1737
1738 if (debug_level >= DEBUG_LEVEL_INFO)
1739 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1740
1741 /* return error if TTY interface open */
1742 if (info->port.count)
1743 return -EBUSY;
1744
1745 if (cmd != SIOCWANDEV)
1746 return hdlc_ioctl(dev, ifr, cmd);
1747
1748 switch(ifr->ifr_settings.type) {
1749 case IF_GET_IFACE: /* return current sync_serial_settings */
1750
1751 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1752 if (ifr->ifr_settings.size < size) {
1753 ifr->ifr_settings.size = size; /* data size wanted */
1754 return -ENOBUFS;
1755 }
1756
1757 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1758 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1759 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1760 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1761
1762 switch (flags){
1763 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1764 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1765 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1766 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1767 default: new_line.clock_type = CLOCK_DEFAULT;
1768 }
1769
1770 new_line.clock_rate = info->params.clock_speed;
1771 new_line.loopback = info->params.loopback ? 1:0;
1772
1773 if (copy_to_user(line, &new_line, size))
1774 return -EFAULT;
1775 return 0;
1776
1777 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1778
1779 if(!capable(CAP_NET_ADMIN))
1780 return -EPERM;
1781 if (copy_from_user(&new_line, line, size))
1782 return -EFAULT;
1783
1784 switch (new_line.clock_type)
1785 {
1786 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1787 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1788 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1789 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1790 case CLOCK_DEFAULT: flags = info->params.flags &
1791 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1792 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1793 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1794 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1795 default: return -EINVAL;
1796 }
1797
1798 if (new_line.loopback != 0 && new_line.loopback != 1)
1799 return -EINVAL;
1800
1801 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1802 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1803 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1804 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1805 info->params.flags |= flags;
1806
1807 info->params.loopback = new_line.loopback;
1808
1809 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1810 info->params.clock_speed = new_line.clock_rate;
1811 else
1812 info->params.clock_speed = 0;
1813
1814 /* if network interface up, reprogram hardware */
1815 if (info->netcount)
1816 program_hw(info);
1817 return 0;
1818
1819 default:
1820 return hdlc_ioctl(dev, ifr, cmd);
1821 }
1822 }
1823
1824 /**
1825 * called by network layer when transmit timeout is detected
1826 *
1827 * dev pointer to network device structure
1828 */
hdlcdev_tx_timeout(struct net_device * dev)1829 static void hdlcdev_tx_timeout(struct net_device *dev)
1830 {
1831 SLMP_INFO *info = dev_to_port(dev);
1832 unsigned long flags;
1833
1834 if (debug_level >= DEBUG_LEVEL_INFO)
1835 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1836
1837 dev->stats.tx_errors++;
1838 dev->stats.tx_aborted_errors++;
1839
1840 spin_lock_irqsave(&info->lock,flags);
1841 tx_stop(info);
1842 spin_unlock_irqrestore(&info->lock,flags);
1843
1844 netif_wake_queue(dev);
1845 }
1846
1847 /**
1848 * called by device driver when transmit completes
1849 * reenable network layer transmit if stopped
1850 *
1851 * info pointer to device instance information
1852 */
hdlcdev_tx_done(SLMP_INFO * info)1853 static void hdlcdev_tx_done(SLMP_INFO *info)
1854 {
1855 if (netif_queue_stopped(info->netdev))
1856 netif_wake_queue(info->netdev);
1857 }
1858
1859 /**
1860 * called by device driver when frame received
1861 * pass frame to network layer
1862 *
1863 * info pointer to device instance information
1864 * buf pointer to buffer contianing frame data
1865 * size count of data bytes in buf
1866 */
hdlcdev_rx(SLMP_INFO * info,char * buf,int size)1867 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1868 {
1869 struct sk_buff *skb = dev_alloc_skb(size);
1870 struct net_device *dev = info->netdev;
1871
1872 if (debug_level >= DEBUG_LEVEL_INFO)
1873 printk("hdlcdev_rx(%s)\n",dev->name);
1874
1875 if (skb == NULL) {
1876 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1877 dev->name);
1878 dev->stats.rx_dropped++;
1879 return;
1880 }
1881
1882 memcpy(skb_put(skb, size), buf, size);
1883
1884 skb->protocol = hdlc_type_trans(skb, dev);
1885
1886 dev->stats.rx_packets++;
1887 dev->stats.rx_bytes += size;
1888
1889 netif_rx(skb);
1890 }
1891
1892 static const struct net_device_ops hdlcdev_ops = {
1893 .ndo_open = hdlcdev_open,
1894 .ndo_stop = hdlcdev_close,
1895 .ndo_change_mtu = hdlc_change_mtu,
1896 .ndo_start_xmit = hdlc_start_xmit,
1897 .ndo_do_ioctl = hdlcdev_ioctl,
1898 .ndo_tx_timeout = hdlcdev_tx_timeout,
1899 };
1900
1901 /**
1902 * called by device driver when adding device instance
1903 * do generic HDLC initialization
1904 *
1905 * info pointer to device instance information
1906 *
1907 * returns 0 if success, otherwise error code
1908 */
hdlcdev_init(SLMP_INFO * info)1909 static int hdlcdev_init(SLMP_INFO *info)
1910 {
1911 int rc;
1912 struct net_device *dev;
1913 hdlc_device *hdlc;
1914
1915 /* allocate and initialize network and HDLC layer objects */
1916
1917 if (!(dev = alloc_hdlcdev(info))) {
1918 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1919 return -ENOMEM;
1920 }
1921
1922 /* for network layer reporting purposes only */
1923 dev->mem_start = info->phys_sca_base;
1924 dev->mem_end = info->phys_sca_base + SCA_BASE_SIZE - 1;
1925 dev->irq = info->irq_level;
1926
1927 /* network layer callbacks and settings */
1928 dev->netdev_ops = &hdlcdev_ops;
1929 dev->watchdog_timeo = 10 * HZ;
1930 dev->tx_queue_len = 50;
1931
1932 /* generic HDLC layer callbacks and settings */
1933 hdlc = dev_to_hdlc(dev);
1934 hdlc->attach = hdlcdev_attach;
1935 hdlc->xmit = hdlcdev_xmit;
1936
1937 /* register objects with HDLC layer */
1938 if ((rc = register_hdlc_device(dev))) {
1939 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1940 free_netdev(dev);
1941 return rc;
1942 }
1943
1944 info->netdev = dev;
1945 return 0;
1946 }
1947
1948 /**
1949 * called by device driver when removing device instance
1950 * do generic HDLC cleanup
1951 *
1952 * info pointer to device instance information
1953 */
hdlcdev_exit(SLMP_INFO * info)1954 static void hdlcdev_exit(SLMP_INFO *info)
1955 {
1956 unregister_hdlc_device(info->netdev);
1957 free_netdev(info->netdev);
1958 info->netdev = NULL;
1959 }
1960
1961 #endif /* CONFIG_HDLC */
1962
1963
1964 /* Return next bottom half action to perform.
1965 * Return Value: BH action code or 0 if nothing to do.
1966 */
bh_action(SLMP_INFO * info)1967 static int bh_action(SLMP_INFO *info)
1968 {
1969 unsigned long flags;
1970 int rc = 0;
1971
1972 spin_lock_irqsave(&info->lock,flags);
1973
1974 if (info->pending_bh & BH_RECEIVE) {
1975 info->pending_bh &= ~BH_RECEIVE;
1976 rc = BH_RECEIVE;
1977 } else if (info->pending_bh & BH_TRANSMIT) {
1978 info->pending_bh &= ~BH_TRANSMIT;
1979 rc = BH_TRANSMIT;
1980 } else if (info->pending_bh & BH_STATUS) {
1981 info->pending_bh &= ~BH_STATUS;
1982 rc = BH_STATUS;
1983 }
1984
1985 if (!rc) {
1986 /* Mark BH routine as complete */
1987 info->bh_running = false;
1988 info->bh_requested = false;
1989 }
1990
1991 spin_unlock_irqrestore(&info->lock,flags);
1992
1993 return rc;
1994 }
1995
1996 /* Perform bottom half processing of work items queued by ISR.
1997 */
bh_handler(struct work_struct * work)1998 static void bh_handler(struct work_struct *work)
1999 {
2000 SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2001 int action;
2002
2003 if (!info)
2004 return;
2005
2006 if ( debug_level >= DEBUG_LEVEL_BH )
2007 printk( "%s(%d):%s bh_handler() entry\n",
2008 __FILE__,__LINE__,info->device_name);
2009
2010 info->bh_running = true;
2011
2012 while((action = bh_action(info)) != 0) {
2013
2014 /* Process work item */
2015 if ( debug_level >= DEBUG_LEVEL_BH )
2016 printk( "%s(%d):%s bh_handler() work item action=%d\n",
2017 __FILE__,__LINE__,info->device_name, action);
2018
2019 switch (action) {
2020
2021 case BH_RECEIVE:
2022 bh_receive(info);
2023 break;
2024 case BH_TRANSMIT:
2025 bh_transmit(info);
2026 break;
2027 case BH_STATUS:
2028 bh_status(info);
2029 break;
2030 default:
2031 /* unknown work item ID */
2032 printk("%s(%d):%s Unknown work item ID=%08X!\n",
2033 __FILE__,__LINE__,info->device_name,action);
2034 break;
2035 }
2036 }
2037
2038 if ( debug_level >= DEBUG_LEVEL_BH )
2039 printk( "%s(%d):%s bh_handler() exit\n",
2040 __FILE__,__LINE__,info->device_name);
2041 }
2042
bh_receive(SLMP_INFO * info)2043 static void bh_receive(SLMP_INFO *info)
2044 {
2045 if ( debug_level >= DEBUG_LEVEL_BH )
2046 printk( "%s(%d):%s bh_receive()\n",
2047 __FILE__,__LINE__,info->device_name);
2048
2049 while( rx_get_frame(info) );
2050 }
2051
bh_transmit(SLMP_INFO * info)2052 static void bh_transmit(SLMP_INFO *info)
2053 {
2054 struct tty_struct *tty = info->port.tty;
2055
2056 if ( debug_level >= DEBUG_LEVEL_BH )
2057 printk( "%s(%d):%s bh_transmit() entry\n",
2058 __FILE__,__LINE__,info->device_name);
2059
2060 if (tty)
2061 tty_wakeup(tty);
2062 }
2063
bh_status(SLMP_INFO * info)2064 static void bh_status(SLMP_INFO *info)
2065 {
2066 if ( debug_level >= DEBUG_LEVEL_BH )
2067 printk( "%s(%d):%s bh_status() entry\n",
2068 __FILE__,__LINE__,info->device_name);
2069
2070 info->ri_chkcount = 0;
2071 info->dsr_chkcount = 0;
2072 info->dcd_chkcount = 0;
2073 info->cts_chkcount = 0;
2074 }
2075
isr_timer(SLMP_INFO * info)2076 static void isr_timer(SLMP_INFO * info)
2077 {
2078 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2079
2080 /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2081 write_reg(info, IER2, 0);
2082
2083 /* TMCS, Timer Control/Status Register
2084 *
2085 * 07 CMF, Compare match flag (read only) 1=match
2086 * 06 ECMI, CMF Interrupt Enable: 0=disabled
2087 * 05 Reserved, must be 0
2088 * 04 TME, Timer Enable
2089 * 03..00 Reserved, must be 0
2090 *
2091 * 0000 0000
2092 */
2093 write_reg(info, (unsigned char)(timer + TMCS), 0);
2094
2095 info->irq_occurred = true;
2096
2097 if ( debug_level >= DEBUG_LEVEL_ISR )
2098 printk("%s(%d):%s isr_timer()\n",
2099 __FILE__,__LINE__,info->device_name);
2100 }
2101
isr_rxint(SLMP_INFO * info)2102 static void isr_rxint(SLMP_INFO * info)
2103 {
2104 struct tty_struct *tty = info->port.tty;
2105 struct mgsl_icount *icount = &info->icount;
2106 unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2107 unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2108
2109 /* clear status bits */
2110 if (status)
2111 write_reg(info, SR1, status);
2112
2113 if (status2)
2114 write_reg(info, SR2, status2);
2115
2116 if ( debug_level >= DEBUG_LEVEL_ISR )
2117 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2118 __FILE__,__LINE__,info->device_name,status,status2);
2119
2120 if (info->params.mode == MGSL_MODE_ASYNC) {
2121 if (status & BRKD) {
2122 icount->brk++;
2123
2124 /* process break detection if tty control
2125 * is not set to ignore it
2126 */
2127 if ( tty ) {
2128 if (!(status & info->ignore_status_mask1)) {
2129 if (info->read_status_mask1 & BRKD) {
2130 tty_insert_flip_char(tty, 0, TTY_BREAK);
2131 if (info->port.flags & ASYNC_SAK)
2132 do_SAK(tty);
2133 }
2134 }
2135 }
2136 }
2137 }
2138 else {
2139 if (status & (FLGD|IDLD)) {
2140 if (status & FLGD)
2141 info->icount.exithunt++;
2142 else if (status & IDLD)
2143 info->icount.rxidle++;
2144 wake_up_interruptible(&info->event_wait_q);
2145 }
2146 }
2147
2148 if (status & CDCD) {
2149 /* simulate a common modem status change interrupt
2150 * for our handler
2151 */
2152 get_signals( info );
2153 isr_io_pin(info,
2154 MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2155 }
2156 }
2157
2158 /*
2159 * handle async rx data interrupts
2160 */
isr_rxrdy(SLMP_INFO * info)2161 static void isr_rxrdy(SLMP_INFO * info)
2162 {
2163 u16 status;
2164 unsigned char DataByte;
2165 struct tty_struct *tty = info->port.tty;
2166 struct mgsl_icount *icount = &info->icount;
2167
2168 if ( debug_level >= DEBUG_LEVEL_ISR )
2169 printk("%s(%d):%s isr_rxrdy\n",
2170 __FILE__,__LINE__,info->device_name);
2171
2172 while((status = read_reg(info,CST0)) & BIT0)
2173 {
2174 int flag = 0;
2175 bool over = false;
2176 DataByte = read_reg(info,TRB);
2177
2178 icount->rx++;
2179
2180 if ( status & (PE + FRME + OVRN) ) {
2181 printk("%s(%d):%s rxerr=%04X\n",
2182 __FILE__,__LINE__,info->device_name,status);
2183
2184 /* update error statistics */
2185 if (status & PE)
2186 icount->parity++;
2187 else if (status & FRME)
2188 icount->frame++;
2189 else if (status & OVRN)
2190 icount->overrun++;
2191
2192 /* discard char if tty control flags say so */
2193 if (status & info->ignore_status_mask2)
2194 continue;
2195
2196 status &= info->read_status_mask2;
2197
2198 if ( tty ) {
2199 if (status & PE)
2200 flag = TTY_PARITY;
2201 else if (status & FRME)
2202 flag = TTY_FRAME;
2203 if (status & OVRN) {
2204 /* Overrun is special, since it's
2205 * reported immediately, and doesn't
2206 * affect the current character
2207 */
2208 over = true;
2209 }
2210 }
2211 } /* end of if (error) */
2212
2213 if ( tty ) {
2214 tty_insert_flip_char(tty, DataByte, flag);
2215 if (over)
2216 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2217 }
2218 }
2219
2220 if ( debug_level >= DEBUG_LEVEL_ISR ) {
2221 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2222 __FILE__,__LINE__,info->device_name,
2223 icount->rx,icount->brk,icount->parity,
2224 icount->frame,icount->overrun);
2225 }
2226
2227 if ( tty )
2228 tty_flip_buffer_push(tty);
2229 }
2230
isr_txeom(SLMP_INFO * info,unsigned char status)2231 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2232 {
2233 if ( debug_level >= DEBUG_LEVEL_ISR )
2234 printk("%s(%d):%s isr_txeom status=%02x\n",
2235 __FILE__,__LINE__,info->device_name,status);
2236
2237 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2238 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2239 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2240
2241 if (status & UDRN) {
2242 write_reg(info, CMD, TXRESET);
2243 write_reg(info, CMD, TXENABLE);
2244 } else
2245 write_reg(info, CMD, TXBUFCLR);
2246
2247 /* disable and clear tx interrupts */
2248 info->ie0_value &= ~TXRDYE;
2249 info->ie1_value &= ~(IDLE + UDRN);
2250 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2251 write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2252
2253 if ( info->tx_active ) {
2254 if (info->params.mode != MGSL_MODE_ASYNC) {
2255 if (status & UDRN)
2256 info->icount.txunder++;
2257 else if (status & IDLE)
2258 info->icount.txok++;
2259 }
2260
2261 info->tx_active = false;
2262 info->tx_count = info->tx_put = info->tx_get = 0;
2263
2264 del_timer(&info->tx_timer);
2265
2266 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2267 info->serial_signals &= ~SerialSignal_RTS;
2268 info->drop_rts_on_tx_done = false;
2269 set_signals(info);
2270 }
2271
2272 #if SYNCLINK_GENERIC_HDLC
2273 if (info->netcount)
2274 hdlcdev_tx_done(info);
2275 else
2276 #endif
2277 {
2278 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2279 tx_stop(info);
2280 return;
2281 }
2282 info->pending_bh |= BH_TRANSMIT;
2283 }
2284 }
2285 }
2286
2287
2288 /*
2289 * handle tx status interrupts
2290 */
isr_txint(SLMP_INFO * info)2291 static void isr_txint(SLMP_INFO * info)
2292 {
2293 unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2294
2295 /* clear status bits */
2296 write_reg(info, SR1, status);
2297
2298 if ( debug_level >= DEBUG_LEVEL_ISR )
2299 printk("%s(%d):%s isr_txint status=%02x\n",
2300 __FILE__,__LINE__,info->device_name,status);
2301
2302 if (status & (UDRN + IDLE))
2303 isr_txeom(info, status);
2304
2305 if (status & CCTS) {
2306 /* simulate a common modem status change interrupt
2307 * for our handler
2308 */
2309 get_signals( info );
2310 isr_io_pin(info,
2311 MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2312
2313 }
2314 }
2315
2316 /*
2317 * handle async tx data interrupts
2318 */
isr_txrdy(SLMP_INFO * info)2319 static void isr_txrdy(SLMP_INFO * info)
2320 {
2321 if ( debug_level >= DEBUG_LEVEL_ISR )
2322 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2323 __FILE__,__LINE__,info->device_name,info->tx_count);
2324
2325 if (info->params.mode != MGSL_MODE_ASYNC) {
2326 /* disable TXRDY IRQ, enable IDLE IRQ */
2327 info->ie0_value &= ~TXRDYE;
2328 info->ie1_value |= IDLE;
2329 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2330 return;
2331 }
2332
2333 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2334 tx_stop(info);
2335 return;
2336 }
2337
2338 if ( info->tx_count )
2339 tx_load_fifo( info );
2340 else {
2341 info->tx_active = false;
2342 info->ie0_value &= ~TXRDYE;
2343 write_reg(info, IE0, info->ie0_value);
2344 }
2345
2346 if (info->tx_count < WAKEUP_CHARS)
2347 info->pending_bh |= BH_TRANSMIT;
2348 }
2349
isr_rxdmaok(SLMP_INFO * info)2350 static void isr_rxdmaok(SLMP_INFO * info)
2351 {
2352 /* BIT7 = EOT (end of transfer)
2353 * BIT6 = EOM (end of message/frame)
2354 */
2355 unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2356
2357 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2358 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2359
2360 if ( debug_level >= DEBUG_LEVEL_ISR )
2361 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2362 __FILE__,__LINE__,info->device_name,status);
2363
2364 info->pending_bh |= BH_RECEIVE;
2365 }
2366
isr_rxdmaerror(SLMP_INFO * info)2367 static void isr_rxdmaerror(SLMP_INFO * info)
2368 {
2369 /* BIT5 = BOF (buffer overflow)
2370 * BIT4 = COF (counter overflow)
2371 */
2372 unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2373
2374 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2375 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2376
2377 if ( debug_level >= DEBUG_LEVEL_ISR )
2378 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2379 __FILE__,__LINE__,info->device_name,status);
2380
2381 info->rx_overflow = true;
2382 info->pending_bh |= BH_RECEIVE;
2383 }
2384
isr_txdmaok(SLMP_INFO * info)2385 static void isr_txdmaok(SLMP_INFO * info)
2386 {
2387 unsigned char status_reg1 = read_reg(info, SR1);
2388
2389 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2390 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2391 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2392
2393 if ( debug_level >= DEBUG_LEVEL_ISR )
2394 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2395 __FILE__,__LINE__,info->device_name,status_reg1);
2396
2397 /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2398 write_reg16(info, TRC0, 0);
2399 info->ie0_value |= TXRDYE;
2400 write_reg(info, IE0, info->ie0_value);
2401 }
2402
isr_txdmaerror(SLMP_INFO * info)2403 static void isr_txdmaerror(SLMP_INFO * info)
2404 {
2405 /* BIT5 = BOF (buffer overflow)
2406 * BIT4 = COF (counter overflow)
2407 */
2408 unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2409
2410 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2411 write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2412
2413 if ( debug_level >= DEBUG_LEVEL_ISR )
2414 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2415 __FILE__,__LINE__,info->device_name,status);
2416 }
2417
2418 /* handle input serial signal changes
2419 */
isr_io_pin(SLMP_INFO * info,u16 status)2420 static void isr_io_pin( SLMP_INFO *info, u16 status )
2421 {
2422 struct mgsl_icount *icount;
2423
2424 if ( debug_level >= DEBUG_LEVEL_ISR )
2425 printk("%s(%d):isr_io_pin status=%04X\n",
2426 __FILE__,__LINE__,status);
2427
2428 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2429 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2430 icount = &info->icount;
2431 /* update input line counters */
2432 if (status & MISCSTATUS_RI_LATCHED) {
2433 icount->rng++;
2434 if ( status & SerialSignal_RI )
2435 info->input_signal_events.ri_up++;
2436 else
2437 info->input_signal_events.ri_down++;
2438 }
2439 if (status & MISCSTATUS_DSR_LATCHED) {
2440 icount->dsr++;
2441 if ( status & SerialSignal_DSR )
2442 info->input_signal_events.dsr_up++;
2443 else
2444 info->input_signal_events.dsr_down++;
2445 }
2446 if (status & MISCSTATUS_DCD_LATCHED) {
2447 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2448 info->ie1_value &= ~CDCD;
2449 write_reg(info, IE1, info->ie1_value);
2450 }
2451 icount->dcd++;
2452 if (status & SerialSignal_DCD) {
2453 info->input_signal_events.dcd_up++;
2454 } else
2455 info->input_signal_events.dcd_down++;
2456 #if SYNCLINK_GENERIC_HDLC
2457 if (info->netcount) {
2458 if (status & SerialSignal_DCD)
2459 netif_carrier_on(info->netdev);
2460 else
2461 netif_carrier_off(info->netdev);
2462 }
2463 #endif
2464 }
2465 if (status & MISCSTATUS_CTS_LATCHED)
2466 {
2467 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2468 info->ie1_value &= ~CCTS;
2469 write_reg(info, IE1, info->ie1_value);
2470 }
2471 icount->cts++;
2472 if ( status & SerialSignal_CTS )
2473 info->input_signal_events.cts_up++;
2474 else
2475 info->input_signal_events.cts_down++;
2476 }
2477 wake_up_interruptible(&info->status_event_wait_q);
2478 wake_up_interruptible(&info->event_wait_q);
2479
2480 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2481 (status & MISCSTATUS_DCD_LATCHED) ) {
2482 if ( debug_level >= DEBUG_LEVEL_ISR )
2483 printk("%s CD now %s...", info->device_name,
2484 (status & SerialSignal_DCD) ? "on" : "off");
2485 if (status & SerialSignal_DCD)
2486 wake_up_interruptible(&info->port.open_wait);
2487 else {
2488 if ( debug_level >= DEBUG_LEVEL_ISR )
2489 printk("doing serial hangup...");
2490 if (info->port.tty)
2491 tty_hangup(info->port.tty);
2492 }
2493 }
2494
2495 if ( (info->port.flags & ASYNC_CTS_FLOW) &&
2496 (status & MISCSTATUS_CTS_LATCHED) ) {
2497 if ( info->port.tty ) {
2498 if (info->port.tty->hw_stopped) {
2499 if (status & SerialSignal_CTS) {
2500 if ( debug_level >= DEBUG_LEVEL_ISR )
2501 printk("CTS tx start...");
2502 info->port.tty->hw_stopped = 0;
2503 tx_start(info);
2504 info->pending_bh |= BH_TRANSMIT;
2505 return;
2506 }
2507 } else {
2508 if (!(status & SerialSignal_CTS)) {
2509 if ( debug_level >= DEBUG_LEVEL_ISR )
2510 printk("CTS tx stop...");
2511 info->port.tty->hw_stopped = 1;
2512 tx_stop(info);
2513 }
2514 }
2515 }
2516 }
2517 }
2518
2519 info->pending_bh |= BH_STATUS;
2520 }
2521
2522 /* Interrupt service routine entry point.
2523 *
2524 * Arguments:
2525 * irq interrupt number that caused interrupt
2526 * dev_id device ID supplied during interrupt registration
2527 * regs interrupted processor context
2528 */
synclinkmp_interrupt(int dummy,void * dev_id)2529 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2530 {
2531 SLMP_INFO *info = dev_id;
2532 unsigned char status, status0, status1=0;
2533 unsigned char dmastatus, dmastatus0, dmastatus1=0;
2534 unsigned char timerstatus0, timerstatus1=0;
2535 unsigned char shift;
2536 unsigned int i;
2537 unsigned short tmp;
2538
2539 if ( debug_level >= DEBUG_LEVEL_ISR )
2540 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2541 __FILE__, __LINE__, info->irq_level);
2542
2543 spin_lock(&info->lock);
2544
2545 for(;;) {
2546
2547 /* get status for SCA0 (ports 0-1) */
2548 tmp = read_reg16(info, ISR0); /* get ISR0 and ISR1 in one read */
2549 status0 = (unsigned char)tmp;
2550 dmastatus0 = (unsigned char)(tmp>>8);
2551 timerstatus0 = read_reg(info, ISR2);
2552
2553 if ( debug_level >= DEBUG_LEVEL_ISR )
2554 printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2555 __FILE__, __LINE__, info->device_name,
2556 status0, dmastatus0, timerstatus0);
2557
2558 if (info->port_count == 4) {
2559 /* get status for SCA1 (ports 2-3) */
2560 tmp = read_reg16(info->port_array[2], ISR0);
2561 status1 = (unsigned char)tmp;
2562 dmastatus1 = (unsigned char)(tmp>>8);
2563 timerstatus1 = read_reg(info->port_array[2], ISR2);
2564
2565 if ( debug_level >= DEBUG_LEVEL_ISR )
2566 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2567 __FILE__,__LINE__,info->device_name,
2568 status1,dmastatus1,timerstatus1);
2569 }
2570
2571 if (!status0 && !dmastatus0 && !timerstatus0 &&
2572 !status1 && !dmastatus1 && !timerstatus1)
2573 break;
2574
2575 for(i=0; i < info->port_count ; i++) {
2576 if (info->port_array[i] == NULL)
2577 continue;
2578 if (i < 2) {
2579 status = status0;
2580 dmastatus = dmastatus0;
2581 } else {
2582 status = status1;
2583 dmastatus = dmastatus1;
2584 }
2585
2586 shift = i & 1 ? 4 :0;
2587
2588 if (status & BIT0 << shift)
2589 isr_rxrdy(info->port_array[i]);
2590 if (status & BIT1 << shift)
2591 isr_txrdy(info->port_array[i]);
2592 if (status & BIT2 << shift)
2593 isr_rxint(info->port_array[i]);
2594 if (status & BIT3 << shift)
2595 isr_txint(info->port_array[i]);
2596
2597 if (dmastatus & BIT0 << shift)
2598 isr_rxdmaerror(info->port_array[i]);
2599 if (dmastatus & BIT1 << shift)
2600 isr_rxdmaok(info->port_array[i]);
2601 if (dmastatus & BIT2 << shift)
2602 isr_txdmaerror(info->port_array[i]);
2603 if (dmastatus & BIT3 << shift)
2604 isr_txdmaok(info->port_array[i]);
2605 }
2606
2607 if (timerstatus0 & (BIT5 | BIT4))
2608 isr_timer(info->port_array[0]);
2609 if (timerstatus0 & (BIT7 | BIT6))
2610 isr_timer(info->port_array[1]);
2611 if (timerstatus1 & (BIT5 | BIT4))
2612 isr_timer(info->port_array[2]);
2613 if (timerstatus1 & (BIT7 | BIT6))
2614 isr_timer(info->port_array[3]);
2615 }
2616
2617 for(i=0; i < info->port_count ; i++) {
2618 SLMP_INFO * port = info->port_array[i];
2619
2620 /* Request bottom half processing if there's something
2621 * for it to do and the bh is not already running.
2622 *
2623 * Note: startup adapter diags require interrupts.
2624 * do not request bottom half processing if the
2625 * device is not open in a normal mode.
2626 */
2627 if ( port && (port->port.count || port->netcount) &&
2628 port->pending_bh && !port->bh_running &&
2629 !port->bh_requested ) {
2630 if ( debug_level >= DEBUG_LEVEL_ISR )
2631 printk("%s(%d):%s queueing bh task.\n",
2632 __FILE__,__LINE__,port->device_name);
2633 schedule_work(&port->task);
2634 port->bh_requested = true;
2635 }
2636 }
2637
2638 spin_unlock(&info->lock);
2639
2640 if ( debug_level >= DEBUG_LEVEL_ISR )
2641 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2642 __FILE__, __LINE__, info->irq_level);
2643 return IRQ_HANDLED;
2644 }
2645
2646 /* Initialize and start device.
2647 */
startup(SLMP_INFO * info)2648 static int startup(SLMP_INFO * info)
2649 {
2650 if ( debug_level >= DEBUG_LEVEL_INFO )
2651 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2652
2653 if (info->port.flags & ASYNC_INITIALIZED)
2654 return 0;
2655
2656 if (!info->tx_buf) {
2657 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2658 if (!info->tx_buf) {
2659 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2660 __FILE__,__LINE__,info->device_name);
2661 return -ENOMEM;
2662 }
2663 }
2664
2665 info->pending_bh = 0;
2666
2667 memset(&info->icount, 0, sizeof(info->icount));
2668
2669 /* program hardware for current parameters */
2670 reset_port(info);
2671
2672 change_params(info);
2673
2674 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2675
2676 if (info->port.tty)
2677 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2678
2679 info->port.flags |= ASYNC_INITIALIZED;
2680
2681 return 0;
2682 }
2683
2684 /* Called by close() and hangup() to shutdown hardware
2685 */
shutdown(SLMP_INFO * info)2686 static void shutdown(SLMP_INFO * info)
2687 {
2688 unsigned long flags;
2689
2690 if (!(info->port.flags & ASYNC_INITIALIZED))
2691 return;
2692
2693 if (debug_level >= DEBUG_LEVEL_INFO)
2694 printk("%s(%d):%s synclinkmp_shutdown()\n",
2695 __FILE__,__LINE__, info->device_name );
2696
2697 /* clear status wait queue because status changes */
2698 /* can't happen after shutting down the hardware */
2699 wake_up_interruptible(&info->status_event_wait_q);
2700 wake_up_interruptible(&info->event_wait_q);
2701
2702 del_timer(&info->tx_timer);
2703 del_timer(&info->status_timer);
2704
2705 kfree(info->tx_buf);
2706 info->tx_buf = NULL;
2707
2708 spin_lock_irqsave(&info->lock,flags);
2709
2710 reset_port(info);
2711
2712 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2713 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2714 set_signals(info);
2715 }
2716
2717 spin_unlock_irqrestore(&info->lock,flags);
2718
2719 if (info->port.tty)
2720 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2721
2722 info->port.flags &= ~ASYNC_INITIALIZED;
2723 }
2724
program_hw(SLMP_INFO * info)2725 static void program_hw(SLMP_INFO *info)
2726 {
2727 unsigned long flags;
2728
2729 spin_lock_irqsave(&info->lock,flags);
2730
2731 rx_stop(info);
2732 tx_stop(info);
2733
2734 info->tx_count = info->tx_put = info->tx_get = 0;
2735
2736 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2737 hdlc_mode(info);
2738 else
2739 async_mode(info);
2740
2741 set_signals(info);
2742
2743 info->dcd_chkcount = 0;
2744 info->cts_chkcount = 0;
2745 info->ri_chkcount = 0;
2746 info->dsr_chkcount = 0;
2747
2748 info->ie1_value |= (CDCD|CCTS);
2749 write_reg(info, IE1, info->ie1_value);
2750
2751 get_signals(info);
2752
2753 if (info->netcount || (info->port.tty && info->port.tty->termios->c_cflag & CREAD) )
2754 rx_start(info);
2755
2756 spin_unlock_irqrestore(&info->lock,flags);
2757 }
2758
2759 /* Reconfigure adapter based on new parameters
2760 */
change_params(SLMP_INFO * info)2761 static void change_params(SLMP_INFO *info)
2762 {
2763 unsigned cflag;
2764 int bits_per_char;
2765
2766 if (!info->port.tty || !info->port.tty->termios)
2767 return;
2768
2769 if (debug_level >= DEBUG_LEVEL_INFO)
2770 printk("%s(%d):%s change_params()\n",
2771 __FILE__,__LINE__, info->device_name );
2772
2773 cflag = info->port.tty->termios->c_cflag;
2774
2775 /* if B0 rate (hangup) specified then negate DTR and RTS */
2776 /* otherwise assert DTR and RTS */
2777 if (cflag & CBAUD)
2778 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2779 else
2780 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2781
2782 /* byte size and parity */
2783
2784 switch (cflag & CSIZE) {
2785 case CS5: info->params.data_bits = 5; break;
2786 case CS6: info->params.data_bits = 6; break;
2787 case CS7: info->params.data_bits = 7; break;
2788 case CS8: info->params.data_bits = 8; break;
2789 /* Never happens, but GCC is too dumb to figure it out */
2790 default: info->params.data_bits = 7; break;
2791 }
2792
2793 if (cflag & CSTOPB)
2794 info->params.stop_bits = 2;
2795 else
2796 info->params.stop_bits = 1;
2797
2798 info->params.parity = ASYNC_PARITY_NONE;
2799 if (cflag & PARENB) {
2800 if (cflag & PARODD)
2801 info->params.parity = ASYNC_PARITY_ODD;
2802 else
2803 info->params.parity = ASYNC_PARITY_EVEN;
2804 #ifdef CMSPAR
2805 if (cflag & CMSPAR)
2806 info->params.parity = ASYNC_PARITY_SPACE;
2807 #endif
2808 }
2809
2810 /* calculate number of jiffies to transmit a full
2811 * FIFO (32 bytes) at specified data rate
2812 */
2813 bits_per_char = info->params.data_bits +
2814 info->params.stop_bits + 1;
2815
2816 /* if port data rate is set to 460800 or less then
2817 * allow tty settings to override, otherwise keep the
2818 * current data rate.
2819 */
2820 if (info->params.data_rate <= 460800) {
2821 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2822 }
2823
2824 if ( info->params.data_rate ) {
2825 info->timeout = (32*HZ*bits_per_char) /
2826 info->params.data_rate;
2827 }
2828 info->timeout += HZ/50; /* Add .02 seconds of slop */
2829
2830 if (cflag & CRTSCTS)
2831 info->port.flags |= ASYNC_CTS_FLOW;
2832 else
2833 info->port.flags &= ~ASYNC_CTS_FLOW;
2834
2835 if (cflag & CLOCAL)
2836 info->port.flags &= ~ASYNC_CHECK_CD;
2837 else
2838 info->port.flags |= ASYNC_CHECK_CD;
2839
2840 /* process tty input control flags */
2841
2842 info->read_status_mask2 = OVRN;
2843 if (I_INPCK(info->port.tty))
2844 info->read_status_mask2 |= PE | FRME;
2845 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2846 info->read_status_mask1 |= BRKD;
2847 if (I_IGNPAR(info->port.tty))
2848 info->ignore_status_mask2 |= PE | FRME;
2849 if (I_IGNBRK(info->port.tty)) {
2850 info->ignore_status_mask1 |= BRKD;
2851 /* If ignoring parity and break indicators, ignore
2852 * overruns too. (For real raw support).
2853 */
2854 if (I_IGNPAR(info->port.tty))
2855 info->ignore_status_mask2 |= OVRN;
2856 }
2857
2858 program_hw(info);
2859 }
2860
get_stats(SLMP_INFO * info,struct mgsl_icount __user * user_icount)2861 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2862 {
2863 int err;
2864
2865 if (debug_level >= DEBUG_LEVEL_INFO)
2866 printk("%s(%d):%s get_params()\n",
2867 __FILE__,__LINE__, info->device_name);
2868
2869 if (!user_icount) {
2870 memset(&info->icount, 0, sizeof(info->icount));
2871 } else {
2872 mutex_lock(&info->port.mutex);
2873 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2874 mutex_unlock(&info->port.mutex);
2875 if (err)
2876 return -EFAULT;
2877 }
2878
2879 return 0;
2880 }
2881
get_params(SLMP_INFO * info,MGSL_PARAMS __user * user_params)2882 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2883 {
2884 int err;
2885 if (debug_level >= DEBUG_LEVEL_INFO)
2886 printk("%s(%d):%s get_params()\n",
2887 __FILE__,__LINE__, info->device_name);
2888
2889 mutex_lock(&info->port.mutex);
2890 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2891 mutex_unlock(&info->port.mutex);
2892 if (err) {
2893 if ( debug_level >= DEBUG_LEVEL_INFO )
2894 printk( "%s(%d):%s get_params() user buffer copy failed\n",
2895 __FILE__,__LINE__,info->device_name);
2896 return -EFAULT;
2897 }
2898
2899 return 0;
2900 }
2901
set_params(SLMP_INFO * info,MGSL_PARAMS __user * new_params)2902 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2903 {
2904 unsigned long flags;
2905 MGSL_PARAMS tmp_params;
2906 int err;
2907
2908 if (debug_level >= DEBUG_LEVEL_INFO)
2909 printk("%s(%d):%s set_params\n",
2910 __FILE__,__LINE__,info->device_name );
2911 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2912 if (err) {
2913 if ( debug_level >= DEBUG_LEVEL_INFO )
2914 printk( "%s(%d):%s set_params() user buffer copy failed\n",
2915 __FILE__,__LINE__,info->device_name);
2916 return -EFAULT;
2917 }
2918
2919 mutex_lock(&info->port.mutex);
2920 spin_lock_irqsave(&info->lock,flags);
2921 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2922 spin_unlock_irqrestore(&info->lock,flags);
2923
2924 change_params(info);
2925 mutex_unlock(&info->port.mutex);
2926
2927 return 0;
2928 }
2929
get_txidle(SLMP_INFO * info,int __user * idle_mode)2930 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2931 {
2932 int err;
2933
2934 if (debug_level >= DEBUG_LEVEL_INFO)
2935 printk("%s(%d):%s get_txidle()=%d\n",
2936 __FILE__,__LINE__, info->device_name, info->idle_mode);
2937
2938 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2939 if (err) {
2940 if ( debug_level >= DEBUG_LEVEL_INFO )
2941 printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2942 __FILE__,__LINE__,info->device_name);
2943 return -EFAULT;
2944 }
2945
2946 return 0;
2947 }
2948
set_txidle(SLMP_INFO * info,int idle_mode)2949 static int set_txidle(SLMP_INFO * info, int idle_mode)
2950 {
2951 unsigned long flags;
2952
2953 if (debug_level >= DEBUG_LEVEL_INFO)
2954 printk("%s(%d):%s set_txidle(%d)\n",
2955 __FILE__,__LINE__,info->device_name, idle_mode );
2956
2957 spin_lock_irqsave(&info->lock,flags);
2958 info->idle_mode = idle_mode;
2959 tx_set_idle( info );
2960 spin_unlock_irqrestore(&info->lock,flags);
2961 return 0;
2962 }
2963
tx_enable(SLMP_INFO * info,int enable)2964 static int tx_enable(SLMP_INFO * info, int enable)
2965 {
2966 unsigned long flags;
2967
2968 if (debug_level >= DEBUG_LEVEL_INFO)
2969 printk("%s(%d):%s tx_enable(%d)\n",
2970 __FILE__,__LINE__,info->device_name, enable);
2971
2972 spin_lock_irqsave(&info->lock,flags);
2973 if ( enable ) {
2974 if ( !info->tx_enabled ) {
2975 tx_start(info);
2976 }
2977 } else {
2978 if ( info->tx_enabled )
2979 tx_stop(info);
2980 }
2981 spin_unlock_irqrestore(&info->lock,flags);
2982 return 0;
2983 }
2984
2985 /* abort send HDLC frame
2986 */
tx_abort(SLMP_INFO * info)2987 static int tx_abort(SLMP_INFO * info)
2988 {
2989 unsigned long flags;
2990
2991 if (debug_level >= DEBUG_LEVEL_INFO)
2992 printk("%s(%d):%s tx_abort()\n",
2993 __FILE__,__LINE__,info->device_name);
2994
2995 spin_lock_irqsave(&info->lock,flags);
2996 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
2997 info->ie1_value &= ~UDRN;
2998 info->ie1_value |= IDLE;
2999 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
3000 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
3001
3002 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
3003 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3004
3005 write_reg(info, CMD, TXABORT);
3006 }
3007 spin_unlock_irqrestore(&info->lock,flags);
3008 return 0;
3009 }
3010
rx_enable(SLMP_INFO * info,int enable)3011 static int rx_enable(SLMP_INFO * info, int enable)
3012 {
3013 unsigned long flags;
3014
3015 if (debug_level >= DEBUG_LEVEL_INFO)
3016 printk("%s(%d):%s rx_enable(%d)\n",
3017 __FILE__,__LINE__,info->device_name,enable);
3018
3019 spin_lock_irqsave(&info->lock,flags);
3020 if ( enable ) {
3021 if ( !info->rx_enabled )
3022 rx_start(info);
3023 } else {
3024 if ( info->rx_enabled )
3025 rx_stop(info);
3026 }
3027 spin_unlock_irqrestore(&info->lock,flags);
3028 return 0;
3029 }
3030
3031 /* wait for specified event to occur
3032 */
wait_mgsl_event(SLMP_INFO * info,int __user * mask_ptr)3033 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3034 {
3035 unsigned long flags;
3036 int s;
3037 int rc=0;
3038 struct mgsl_icount cprev, cnow;
3039 int events;
3040 int mask;
3041 struct _input_signal_events oldsigs, newsigs;
3042 DECLARE_WAITQUEUE(wait, current);
3043
3044 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3045 if (rc) {
3046 return -EFAULT;
3047 }
3048
3049 if (debug_level >= DEBUG_LEVEL_INFO)
3050 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3051 __FILE__,__LINE__,info->device_name,mask);
3052
3053 spin_lock_irqsave(&info->lock,flags);
3054
3055 /* return immediately if state matches requested events */
3056 get_signals(info);
3057 s = info->serial_signals;
3058
3059 events = mask &
3060 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3061 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3062 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3063 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3064 if (events) {
3065 spin_unlock_irqrestore(&info->lock,flags);
3066 goto exit;
3067 }
3068
3069 /* save current irq counts */
3070 cprev = info->icount;
3071 oldsigs = info->input_signal_events;
3072
3073 /* enable hunt and idle irqs if needed */
3074 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3075 unsigned char oldval = info->ie1_value;
3076 unsigned char newval = oldval +
3077 (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3078 (mask & MgslEvent_IdleReceived ? IDLD:0);
3079 if ( oldval != newval ) {
3080 info->ie1_value = newval;
3081 write_reg(info, IE1, info->ie1_value);
3082 }
3083 }
3084
3085 set_current_state(TASK_INTERRUPTIBLE);
3086 add_wait_queue(&info->event_wait_q, &wait);
3087
3088 spin_unlock_irqrestore(&info->lock,flags);
3089
3090 for(;;) {
3091 schedule();
3092 if (signal_pending(current)) {
3093 rc = -ERESTARTSYS;
3094 break;
3095 }
3096
3097 /* get current irq counts */
3098 spin_lock_irqsave(&info->lock,flags);
3099 cnow = info->icount;
3100 newsigs = info->input_signal_events;
3101 set_current_state(TASK_INTERRUPTIBLE);
3102 spin_unlock_irqrestore(&info->lock,flags);
3103
3104 /* if no change, wait aborted for some reason */
3105 if (newsigs.dsr_up == oldsigs.dsr_up &&
3106 newsigs.dsr_down == oldsigs.dsr_down &&
3107 newsigs.dcd_up == oldsigs.dcd_up &&
3108 newsigs.dcd_down == oldsigs.dcd_down &&
3109 newsigs.cts_up == oldsigs.cts_up &&
3110 newsigs.cts_down == oldsigs.cts_down &&
3111 newsigs.ri_up == oldsigs.ri_up &&
3112 newsigs.ri_down == oldsigs.ri_down &&
3113 cnow.exithunt == cprev.exithunt &&
3114 cnow.rxidle == cprev.rxidle) {
3115 rc = -EIO;
3116 break;
3117 }
3118
3119 events = mask &
3120 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
3121 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3122 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
3123 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3124 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
3125 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3126 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
3127 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
3128 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
3129 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
3130 if (events)
3131 break;
3132
3133 cprev = cnow;
3134 oldsigs = newsigs;
3135 }
3136
3137 remove_wait_queue(&info->event_wait_q, &wait);
3138 set_current_state(TASK_RUNNING);
3139
3140
3141 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3142 spin_lock_irqsave(&info->lock,flags);
3143 if (!waitqueue_active(&info->event_wait_q)) {
3144 /* disable enable exit hunt mode/idle rcvd IRQs */
3145 info->ie1_value &= ~(FLGD|IDLD);
3146 write_reg(info, IE1, info->ie1_value);
3147 }
3148 spin_unlock_irqrestore(&info->lock,flags);
3149 }
3150 exit:
3151 if ( rc == 0 )
3152 PUT_USER(rc, events, mask_ptr);
3153
3154 return rc;
3155 }
3156
modem_input_wait(SLMP_INFO * info,int arg)3157 static int modem_input_wait(SLMP_INFO *info,int arg)
3158 {
3159 unsigned long flags;
3160 int rc;
3161 struct mgsl_icount cprev, cnow;
3162 DECLARE_WAITQUEUE(wait, current);
3163
3164 /* save current irq counts */
3165 spin_lock_irqsave(&info->lock,flags);
3166 cprev = info->icount;
3167 add_wait_queue(&info->status_event_wait_q, &wait);
3168 set_current_state(TASK_INTERRUPTIBLE);
3169 spin_unlock_irqrestore(&info->lock,flags);
3170
3171 for(;;) {
3172 schedule();
3173 if (signal_pending(current)) {
3174 rc = -ERESTARTSYS;
3175 break;
3176 }
3177
3178 /* get new irq counts */
3179 spin_lock_irqsave(&info->lock,flags);
3180 cnow = info->icount;
3181 set_current_state(TASK_INTERRUPTIBLE);
3182 spin_unlock_irqrestore(&info->lock,flags);
3183
3184 /* if no change, wait aborted for some reason */
3185 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3186 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3187 rc = -EIO;
3188 break;
3189 }
3190
3191 /* check for change in caller specified modem input */
3192 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3193 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3194 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3195 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3196 rc = 0;
3197 break;
3198 }
3199
3200 cprev = cnow;
3201 }
3202 remove_wait_queue(&info->status_event_wait_q, &wait);
3203 set_current_state(TASK_RUNNING);
3204 return rc;
3205 }
3206
3207 /* return the state of the serial control and status signals
3208 */
tiocmget(struct tty_struct * tty)3209 static int tiocmget(struct tty_struct *tty)
3210 {
3211 SLMP_INFO *info = tty->driver_data;
3212 unsigned int result;
3213 unsigned long flags;
3214
3215 spin_lock_irqsave(&info->lock,flags);
3216 get_signals(info);
3217 spin_unlock_irqrestore(&info->lock,flags);
3218
3219 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3220 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3221 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3222 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3223 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3224 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3225
3226 if (debug_level >= DEBUG_LEVEL_INFO)
3227 printk("%s(%d):%s tiocmget() value=%08X\n",
3228 __FILE__,__LINE__, info->device_name, result );
3229 return result;
3230 }
3231
3232 /* set modem control signals (DTR/RTS)
3233 */
tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)3234 static int tiocmset(struct tty_struct *tty,
3235 unsigned int set, unsigned int clear)
3236 {
3237 SLMP_INFO *info = tty->driver_data;
3238 unsigned long flags;
3239
3240 if (debug_level >= DEBUG_LEVEL_INFO)
3241 printk("%s(%d):%s tiocmset(%x,%x)\n",
3242 __FILE__,__LINE__,info->device_name, set, clear);
3243
3244 if (set & TIOCM_RTS)
3245 info->serial_signals |= SerialSignal_RTS;
3246 if (set & TIOCM_DTR)
3247 info->serial_signals |= SerialSignal_DTR;
3248 if (clear & TIOCM_RTS)
3249 info->serial_signals &= ~SerialSignal_RTS;
3250 if (clear & TIOCM_DTR)
3251 info->serial_signals &= ~SerialSignal_DTR;
3252
3253 spin_lock_irqsave(&info->lock,flags);
3254 set_signals(info);
3255 spin_unlock_irqrestore(&info->lock,flags);
3256
3257 return 0;
3258 }
3259
carrier_raised(struct tty_port * port)3260 static int carrier_raised(struct tty_port *port)
3261 {
3262 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3263 unsigned long flags;
3264
3265 spin_lock_irqsave(&info->lock,flags);
3266 get_signals(info);
3267 spin_unlock_irqrestore(&info->lock,flags);
3268
3269 return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3270 }
3271
dtr_rts(struct tty_port * port,int on)3272 static void dtr_rts(struct tty_port *port, int on)
3273 {
3274 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3275 unsigned long flags;
3276
3277 spin_lock_irqsave(&info->lock,flags);
3278 if (on)
3279 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3280 else
3281 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3282 set_signals(info);
3283 spin_unlock_irqrestore(&info->lock,flags);
3284 }
3285
3286 /* Block the current process until the specified port is ready to open.
3287 */
block_til_ready(struct tty_struct * tty,struct file * filp,SLMP_INFO * info)3288 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3289 SLMP_INFO *info)
3290 {
3291 DECLARE_WAITQUEUE(wait, current);
3292 int retval;
3293 bool do_clocal = false;
3294 bool extra_count = false;
3295 unsigned long flags;
3296 int cd;
3297 struct tty_port *port = &info->port;
3298
3299 if (debug_level >= DEBUG_LEVEL_INFO)
3300 printk("%s(%d):%s block_til_ready()\n",
3301 __FILE__,__LINE__, tty->driver->name );
3302
3303 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3304 /* nonblock mode is set or port is not enabled */
3305 /* just verify that callout device is not active */
3306 port->flags |= ASYNC_NORMAL_ACTIVE;
3307 return 0;
3308 }
3309
3310 if (tty->termios->c_cflag & CLOCAL)
3311 do_clocal = true;
3312
3313 /* Wait for carrier detect and the line to become
3314 * free (i.e., not in use by the callout). While we are in
3315 * this loop, port->count is dropped by one, so that
3316 * close() knows when to free things. We restore it upon
3317 * exit, either normal or abnormal.
3318 */
3319
3320 retval = 0;
3321 add_wait_queue(&port->open_wait, &wait);
3322
3323 if (debug_level >= DEBUG_LEVEL_INFO)
3324 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3325 __FILE__,__LINE__, tty->driver->name, port->count );
3326
3327 spin_lock_irqsave(&info->lock, flags);
3328 if (!tty_hung_up_p(filp)) {
3329 extra_count = true;
3330 port->count--;
3331 }
3332 spin_unlock_irqrestore(&info->lock, flags);
3333 port->blocked_open++;
3334
3335 while (1) {
3336 if (tty->termios->c_cflag & CBAUD)
3337 tty_port_raise_dtr_rts(port);
3338
3339 set_current_state(TASK_INTERRUPTIBLE);
3340
3341 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3342 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3343 -EAGAIN : -ERESTARTSYS;
3344 break;
3345 }
3346
3347 cd = tty_port_carrier_raised(port);
3348
3349 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
3350 break;
3351
3352 if (signal_pending(current)) {
3353 retval = -ERESTARTSYS;
3354 break;
3355 }
3356
3357 if (debug_level >= DEBUG_LEVEL_INFO)
3358 printk("%s(%d):%s block_til_ready() count=%d\n",
3359 __FILE__,__LINE__, tty->driver->name, port->count );
3360
3361 tty_unlock();
3362 schedule();
3363 tty_lock();
3364 }
3365
3366 set_current_state(TASK_RUNNING);
3367 remove_wait_queue(&port->open_wait, &wait);
3368
3369 if (extra_count)
3370 port->count++;
3371 port->blocked_open--;
3372
3373 if (debug_level >= DEBUG_LEVEL_INFO)
3374 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3375 __FILE__,__LINE__, tty->driver->name, port->count );
3376
3377 if (!retval)
3378 port->flags |= ASYNC_NORMAL_ACTIVE;
3379
3380 return retval;
3381 }
3382
alloc_dma_bufs(SLMP_INFO * info)3383 static int alloc_dma_bufs(SLMP_INFO *info)
3384 {
3385 unsigned short BuffersPerFrame;
3386 unsigned short BufferCount;
3387
3388 // Force allocation to start at 64K boundary for each port.
3389 // This is necessary because *all* buffer descriptors for a port
3390 // *must* be in the same 64K block. All descriptors on a port
3391 // share a common 'base' address (upper 8 bits of 24 bits) programmed
3392 // into the CBP register.
3393 info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3394
3395 /* Calculate the number of DMA buffers necessary to hold the */
3396 /* largest allowable frame size. Note: If the max frame size is */
3397 /* not an even multiple of the DMA buffer size then we need to */
3398 /* round the buffer count per frame up one. */
3399
3400 BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3401 if ( info->max_frame_size % SCABUFSIZE )
3402 BuffersPerFrame++;
3403
3404 /* calculate total number of data buffers (SCABUFSIZE) possible
3405 * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3406 * for the descriptor list (BUFFERLISTSIZE).
3407 */
3408 BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3409
3410 /* limit number of buffers to maximum amount of descriptors */
3411 if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3412 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3413
3414 /* use enough buffers to transmit one max size frame */
3415 info->tx_buf_count = BuffersPerFrame + 1;
3416
3417 /* never use more than half the available buffers for transmit */
3418 if (info->tx_buf_count > (BufferCount/2))
3419 info->tx_buf_count = BufferCount/2;
3420
3421 if (info->tx_buf_count > SCAMAXDESC)
3422 info->tx_buf_count = SCAMAXDESC;
3423
3424 /* use remaining buffers for receive */
3425 info->rx_buf_count = BufferCount - info->tx_buf_count;
3426
3427 if (info->rx_buf_count > SCAMAXDESC)
3428 info->rx_buf_count = SCAMAXDESC;
3429
3430 if ( debug_level >= DEBUG_LEVEL_INFO )
3431 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3432 __FILE__,__LINE__, info->device_name,
3433 info->tx_buf_count,info->rx_buf_count);
3434
3435 if ( alloc_buf_list( info ) < 0 ||
3436 alloc_frame_bufs(info,
3437 info->rx_buf_list,
3438 info->rx_buf_list_ex,
3439 info->rx_buf_count) < 0 ||
3440 alloc_frame_bufs(info,
3441 info->tx_buf_list,
3442 info->tx_buf_list_ex,
3443 info->tx_buf_count) < 0 ||
3444 alloc_tmp_rx_buf(info) < 0 ) {
3445 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3446 __FILE__,__LINE__, info->device_name);
3447 return -ENOMEM;
3448 }
3449
3450 rx_reset_buffers( info );
3451
3452 return 0;
3453 }
3454
3455 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3456 */
alloc_buf_list(SLMP_INFO * info)3457 static int alloc_buf_list(SLMP_INFO *info)
3458 {
3459 unsigned int i;
3460
3461 /* build list in adapter shared memory */
3462 info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3463 info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3464 info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3465
3466 memset(info->buffer_list, 0, BUFFERLISTSIZE);
3467
3468 /* Save virtual address pointers to the receive and */
3469 /* transmit buffer lists. (Receive 1st). These pointers will */
3470 /* be used by the processor to access the lists. */
3471 info->rx_buf_list = (SCADESC *)info->buffer_list;
3472
3473 info->tx_buf_list = (SCADESC *)info->buffer_list;
3474 info->tx_buf_list += info->rx_buf_count;
3475
3476 /* Build links for circular buffer entry lists (tx and rx)
3477 *
3478 * Note: links are physical addresses read by the SCA device
3479 * to determine the next buffer entry to use.
3480 */
3481
3482 for ( i = 0; i < info->rx_buf_count; i++ ) {
3483 /* calculate and store physical address of this buffer entry */
3484 info->rx_buf_list_ex[i].phys_entry =
3485 info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3486
3487 /* calculate and store physical address of */
3488 /* next entry in cirular list of entries */
3489 info->rx_buf_list[i].next = info->buffer_list_phys;
3490 if ( i < info->rx_buf_count - 1 )
3491 info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3492
3493 info->rx_buf_list[i].length = SCABUFSIZE;
3494 }
3495
3496 for ( i = 0; i < info->tx_buf_count; i++ ) {
3497 /* calculate and store physical address of this buffer entry */
3498 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3499 ((info->rx_buf_count + i) * sizeof(SCADESC));
3500
3501 /* calculate and store physical address of */
3502 /* next entry in cirular list of entries */
3503
3504 info->tx_buf_list[i].next = info->buffer_list_phys +
3505 info->rx_buf_count * sizeof(SCADESC);
3506
3507 if ( i < info->tx_buf_count - 1 )
3508 info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3509 }
3510
3511 return 0;
3512 }
3513
3514 /* Allocate the frame DMA buffers used by the specified buffer list.
3515 */
alloc_frame_bufs(SLMP_INFO * info,SCADESC * buf_list,SCADESC_EX * buf_list_ex,int count)3516 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3517 {
3518 int i;
3519 unsigned long phys_addr;
3520
3521 for ( i = 0; i < count; i++ ) {
3522 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3523 phys_addr = info->port_array[0]->last_mem_alloc;
3524 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3525
3526 buf_list[i].buf_ptr = (unsigned short)phys_addr;
3527 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3528 }
3529
3530 return 0;
3531 }
3532
free_dma_bufs(SLMP_INFO * info)3533 static void free_dma_bufs(SLMP_INFO *info)
3534 {
3535 info->buffer_list = NULL;
3536 info->rx_buf_list = NULL;
3537 info->tx_buf_list = NULL;
3538 }
3539
3540 /* allocate buffer large enough to hold max_frame_size.
3541 * This buffer is used to pass an assembled frame to the line discipline.
3542 */
alloc_tmp_rx_buf(SLMP_INFO * info)3543 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3544 {
3545 info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3546 if (info->tmp_rx_buf == NULL)
3547 return -ENOMEM;
3548 return 0;
3549 }
3550
free_tmp_rx_buf(SLMP_INFO * info)3551 static void free_tmp_rx_buf(SLMP_INFO *info)
3552 {
3553 kfree(info->tmp_rx_buf);
3554 info->tmp_rx_buf = NULL;
3555 }
3556
claim_resources(SLMP_INFO * info)3557 static int claim_resources(SLMP_INFO *info)
3558 {
3559 if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3560 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3561 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3562 info->init_error = DiagStatus_AddressConflict;
3563 goto errout;
3564 }
3565 else
3566 info->shared_mem_requested = true;
3567
3568 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3569 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3570 __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3571 info->init_error = DiagStatus_AddressConflict;
3572 goto errout;
3573 }
3574 else
3575 info->lcr_mem_requested = true;
3576
3577 if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3578 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3579 __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3580 info->init_error = DiagStatus_AddressConflict;
3581 goto errout;
3582 }
3583 else
3584 info->sca_base_requested = true;
3585
3586 if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3587 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3588 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3589 info->init_error = DiagStatus_AddressConflict;
3590 goto errout;
3591 }
3592 else
3593 info->sca_statctrl_requested = true;
3594
3595 info->memory_base = ioremap_nocache(info->phys_memory_base,
3596 SCA_MEM_SIZE);
3597 if (!info->memory_base) {
3598 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3599 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3600 info->init_error = DiagStatus_CantAssignPciResources;
3601 goto errout;
3602 }
3603
3604 info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3605 if (!info->lcr_base) {
3606 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3607 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3608 info->init_error = DiagStatus_CantAssignPciResources;
3609 goto errout;
3610 }
3611 info->lcr_base += info->lcr_offset;
3612
3613 info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3614 if (!info->sca_base) {
3615 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3616 __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3617 info->init_error = DiagStatus_CantAssignPciResources;
3618 goto errout;
3619 }
3620 info->sca_base += info->sca_offset;
3621
3622 info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3623 PAGE_SIZE);
3624 if (!info->statctrl_base) {
3625 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3626 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3627 info->init_error = DiagStatus_CantAssignPciResources;
3628 goto errout;
3629 }
3630 info->statctrl_base += info->statctrl_offset;
3631
3632 if ( !memory_test(info) ) {
3633 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3634 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3635 info->init_error = DiagStatus_MemoryError;
3636 goto errout;
3637 }
3638
3639 return 0;
3640
3641 errout:
3642 release_resources( info );
3643 return -ENODEV;
3644 }
3645
release_resources(SLMP_INFO * info)3646 static void release_resources(SLMP_INFO *info)
3647 {
3648 if ( debug_level >= DEBUG_LEVEL_INFO )
3649 printk( "%s(%d):%s release_resources() entry\n",
3650 __FILE__,__LINE__,info->device_name );
3651
3652 if ( info->irq_requested ) {
3653 free_irq(info->irq_level, info);
3654 info->irq_requested = false;
3655 }
3656
3657 if ( info->shared_mem_requested ) {
3658 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3659 info->shared_mem_requested = false;
3660 }
3661 if ( info->lcr_mem_requested ) {
3662 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3663 info->lcr_mem_requested = false;
3664 }
3665 if ( info->sca_base_requested ) {
3666 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3667 info->sca_base_requested = false;
3668 }
3669 if ( info->sca_statctrl_requested ) {
3670 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3671 info->sca_statctrl_requested = false;
3672 }
3673
3674 if (info->memory_base){
3675 iounmap(info->memory_base);
3676 info->memory_base = NULL;
3677 }
3678
3679 if (info->sca_base) {
3680 iounmap(info->sca_base - info->sca_offset);
3681 info->sca_base=NULL;
3682 }
3683
3684 if (info->statctrl_base) {
3685 iounmap(info->statctrl_base - info->statctrl_offset);
3686 info->statctrl_base=NULL;
3687 }
3688
3689 if (info->lcr_base){
3690 iounmap(info->lcr_base - info->lcr_offset);
3691 info->lcr_base = NULL;
3692 }
3693
3694 if ( debug_level >= DEBUG_LEVEL_INFO )
3695 printk( "%s(%d):%s release_resources() exit\n",
3696 __FILE__,__LINE__,info->device_name );
3697 }
3698
3699 /* Add the specified device instance data structure to the
3700 * global linked list of devices and increment the device count.
3701 */
add_device(SLMP_INFO * info)3702 static void add_device(SLMP_INFO *info)
3703 {
3704 info->next_device = NULL;
3705 info->line = synclinkmp_device_count;
3706 sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3707
3708 if (info->line < MAX_DEVICES) {
3709 if (maxframe[info->line])
3710 info->max_frame_size = maxframe[info->line];
3711 }
3712
3713 synclinkmp_device_count++;
3714
3715 if ( !synclinkmp_device_list )
3716 synclinkmp_device_list = info;
3717 else {
3718 SLMP_INFO *current_dev = synclinkmp_device_list;
3719 while( current_dev->next_device )
3720 current_dev = current_dev->next_device;
3721 current_dev->next_device = info;
3722 }
3723
3724 if ( info->max_frame_size < 4096 )
3725 info->max_frame_size = 4096;
3726 else if ( info->max_frame_size > 65535 )
3727 info->max_frame_size = 65535;
3728
3729 printk( "SyncLink MultiPort %s: "
3730 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3731 info->device_name,
3732 info->phys_sca_base,
3733 info->phys_memory_base,
3734 info->phys_statctrl_base,
3735 info->phys_lcr_base,
3736 info->irq_level,
3737 info->max_frame_size );
3738
3739 #if SYNCLINK_GENERIC_HDLC
3740 hdlcdev_init(info);
3741 #endif
3742 }
3743
3744 static const struct tty_port_operations port_ops = {
3745 .carrier_raised = carrier_raised,
3746 .dtr_rts = dtr_rts,
3747 };
3748
3749 /* Allocate and initialize a device instance structure
3750 *
3751 * Return Value: pointer to SLMP_INFO if success, otherwise NULL
3752 */
alloc_dev(int adapter_num,int port_num,struct pci_dev * pdev)3753 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3754 {
3755 SLMP_INFO *info;
3756
3757 info = kzalloc(sizeof(SLMP_INFO),
3758 GFP_KERNEL);
3759
3760 if (!info) {
3761 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3762 __FILE__,__LINE__, adapter_num, port_num);
3763 } else {
3764 tty_port_init(&info->port);
3765 info->port.ops = &port_ops;
3766 info->magic = MGSL_MAGIC;
3767 INIT_WORK(&info->task, bh_handler);
3768 info->max_frame_size = 4096;
3769 info->port.close_delay = 5*HZ/10;
3770 info->port.closing_wait = 30*HZ;
3771 init_waitqueue_head(&info->status_event_wait_q);
3772 init_waitqueue_head(&info->event_wait_q);
3773 spin_lock_init(&info->netlock);
3774 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3775 info->idle_mode = HDLC_TXIDLE_FLAGS;
3776 info->adapter_num = adapter_num;
3777 info->port_num = port_num;
3778
3779 /* Copy configuration info to device instance data */
3780 info->irq_level = pdev->irq;
3781 info->phys_lcr_base = pci_resource_start(pdev,0);
3782 info->phys_sca_base = pci_resource_start(pdev,2);
3783 info->phys_memory_base = pci_resource_start(pdev,3);
3784 info->phys_statctrl_base = pci_resource_start(pdev,4);
3785
3786 /* Because veremap only works on page boundaries we must map
3787 * a larger area than is actually implemented for the LCR
3788 * memory range. We map a full page starting at the page boundary.
3789 */
3790 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
3791 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3792
3793 info->sca_offset = info->phys_sca_base & (PAGE_SIZE-1);
3794 info->phys_sca_base &= ~(PAGE_SIZE-1);
3795
3796 info->statctrl_offset = info->phys_statctrl_base & (PAGE_SIZE-1);
3797 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3798
3799 info->bus_type = MGSL_BUS_TYPE_PCI;
3800 info->irq_flags = IRQF_SHARED;
3801
3802 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3803 setup_timer(&info->status_timer, status_timeout,
3804 (unsigned long)info);
3805
3806 /* Store the PCI9050 misc control register value because a flaw
3807 * in the PCI9050 prevents LCR registers from being read if
3808 * BIOS assigns an LCR base address with bit 7 set.
3809 *
3810 * Only the misc control register is accessed for which only
3811 * write access is needed, so set an initial value and change
3812 * bits to the device instance data as we write the value
3813 * to the actual misc control register.
3814 */
3815 info->misc_ctrl_value = 0x087e4546;
3816
3817 /* initial port state is unknown - if startup errors
3818 * occur, init_error will be set to indicate the
3819 * problem. Once the port is fully initialized,
3820 * this value will be set to 0 to indicate the
3821 * port is available.
3822 */
3823 info->init_error = -1;
3824 }
3825
3826 return info;
3827 }
3828
device_init(int adapter_num,struct pci_dev * pdev)3829 static void device_init(int adapter_num, struct pci_dev *pdev)
3830 {
3831 SLMP_INFO *port_array[SCA_MAX_PORTS];
3832 int port;
3833
3834 /* allocate device instances for up to SCA_MAX_PORTS devices */
3835 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3836 port_array[port] = alloc_dev(adapter_num,port,pdev);
3837 if( port_array[port] == NULL ) {
3838 for ( --port; port >= 0; --port )
3839 kfree(port_array[port]);
3840 return;
3841 }
3842 }
3843
3844 /* give copy of port_array to all ports and add to device list */
3845 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3846 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3847 add_device( port_array[port] );
3848 spin_lock_init(&port_array[port]->lock);
3849 }
3850
3851 /* Allocate and claim adapter resources */
3852 if ( !claim_resources(port_array[0]) ) {
3853
3854 alloc_dma_bufs(port_array[0]);
3855
3856 /* copy resource information from first port to others */
3857 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3858 port_array[port]->lock = port_array[0]->lock;
3859 port_array[port]->irq_level = port_array[0]->irq_level;
3860 port_array[port]->memory_base = port_array[0]->memory_base;
3861 port_array[port]->sca_base = port_array[0]->sca_base;
3862 port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3863 port_array[port]->lcr_base = port_array[0]->lcr_base;
3864 alloc_dma_bufs(port_array[port]);
3865 }
3866
3867 if ( request_irq(port_array[0]->irq_level,
3868 synclinkmp_interrupt,
3869 port_array[0]->irq_flags,
3870 port_array[0]->device_name,
3871 port_array[0]) < 0 ) {
3872 printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3873 __FILE__,__LINE__,
3874 port_array[0]->device_name,
3875 port_array[0]->irq_level );
3876 }
3877 else {
3878 port_array[0]->irq_requested = true;
3879 adapter_test(port_array[0]);
3880 }
3881 }
3882 }
3883
3884 static const struct tty_operations ops = {
3885 .open = open,
3886 .close = close,
3887 .write = write,
3888 .put_char = put_char,
3889 .flush_chars = flush_chars,
3890 .write_room = write_room,
3891 .chars_in_buffer = chars_in_buffer,
3892 .flush_buffer = flush_buffer,
3893 .ioctl = ioctl,
3894 .throttle = throttle,
3895 .unthrottle = unthrottle,
3896 .send_xchar = send_xchar,
3897 .break_ctl = set_break,
3898 .wait_until_sent = wait_until_sent,
3899 .set_termios = set_termios,
3900 .stop = tx_hold,
3901 .start = tx_release,
3902 .hangup = hangup,
3903 .tiocmget = tiocmget,
3904 .tiocmset = tiocmset,
3905 .get_icount = get_icount,
3906 .proc_fops = &synclinkmp_proc_fops,
3907 };
3908
3909
synclinkmp_cleanup(void)3910 static void synclinkmp_cleanup(void)
3911 {
3912 int rc;
3913 SLMP_INFO *info;
3914 SLMP_INFO *tmp;
3915
3916 printk("Unloading %s %s\n", driver_name, driver_version);
3917
3918 if (serial_driver) {
3919 if ((rc = tty_unregister_driver(serial_driver)))
3920 printk("%s(%d) failed to unregister tty driver err=%d\n",
3921 __FILE__,__LINE__,rc);
3922 put_tty_driver(serial_driver);
3923 }
3924
3925 /* reset devices */
3926 info = synclinkmp_device_list;
3927 while(info) {
3928 reset_port(info);
3929 info = info->next_device;
3930 }
3931
3932 /* release devices */
3933 info = synclinkmp_device_list;
3934 while(info) {
3935 #if SYNCLINK_GENERIC_HDLC
3936 hdlcdev_exit(info);
3937 #endif
3938 free_dma_bufs(info);
3939 free_tmp_rx_buf(info);
3940 if ( info->port_num == 0 ) {
3941 if (info->sca_base)
3942 write_reg(info, LPR, 1); /* set low power mode */
3943 release_resources(info);
3944 }
3945 tmp = info;
3946 info = info->next_device;
3947 kfree(tmp);
3948 }
3949
3950 pci_unregister_driver(&synclinkmp_pci_driver);
3951 }
3952
3953 /* Driver initialization entry point.
3954 */
3955
synclinkmp_init(void)3956 static int __init synclinkmp_init(void)
3957 {
3958 int rc;
3959
3960 if (break_on_load) {
3961 synclinkmp_get_text_ptr();
3962 BREAKPOINT();
3963 }
3964
3965 printk("%s %s\n", driver_name, driver_version);
3966
3967 if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3968 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3969 return rc;
3970 }
3971
3972 serial_driver = alloc_tty_driver(128);
3973 if (!serial_driver) {
3974 rc = -ENOMEM;
3975 goto error;
3976 }
3977
3978 /* Initialize the tty_driver structure */
3979
3980 serial_driver->owner = THIS_MODULE;
3981 serial_driver->driver_name = "synclinkmp";
3982 serial_driver->name = "ttySLM";
3983 serial_driver->major = ttymajor;
3984 serial_driver->minor_start = 64;
3985 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3986 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3987 serial_driver->init_termios = tty_std_termios;
3988 serial_driver->init_termios.c_cflag =
3989 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3990 serial_driver->init_termios.c_ispeed = 9600;
3991 serial_driver->init_termios.c_ospeed = 9600;
3992 serial_driver->flags = TTY_DRIVER_REAL_RAW;
3993 tty_set_operations(serial_driver, &ops);
3994 if ((rc = tty_register_driver(serial_driver)) < 0) {
3995 printk("%s(%d):Couldn't register serial driver\n",
3996 __FILE__,__LINE__);
3997 put_tty_driver(serial_driver);
3998 serial_driver = NULL;
3999 goto error;
4000 }
4001
4002 printk("%s %s, tty major#%d\n",
4003 driver_name, driver_version,
4004 serial_driver->major);
4005
4006 return 0;
4007
4008 error:
4009 synclinkmp_cleanup();
4010 return rc;
4011 }
4012
synclinkmp_exit(void)4013 static void __exit synclinkmp_exit(void)
4014 {
4015 synclinkmp_cleanup();
4016 }
4017
4018 module_init(synclinkmp_init);
4019 module_exit(synclinkmp_exit);
4020
4021 /* Set the port for internal loopback mode.
4022 * The TxCLK and RxCLK signals are generated from the BRG and
4023 * the TxD is looped back to the RxD internally.
4024 */
enable_loopback(SLMP_INFO * info,int enable)4025 static void enable_loopback(SLMP_INFO *info, int enable)
4026 {
4027 if (enable) {
4028 /* MD2 (Mode Register 2)
4029 * 01..00 CNCT<1..0> Channel Connection 11=Local Loopback
4030 */
4031 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4032
4033 /* degate external TxC clock source */
4034 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4035 write_control_reg(info);
4036
4037 /* RXS/TXS (Rx/Tx clock source)
4038 * 07 Reserved, must be 0
4039 * 06..04 Clock Source, 100=BRG
4040 * 03..00 Clock Divisor, 0000=1
4041 */
4042 write_reg(info, RXS, 0x40);
4043 write_reg(info, TXS, 0x40);
4044
4045 } else {
4046 /* MD2 (Mode Register 2)
4047 * 01..00 CNCT<1..0> Channel connection, 0=normal
4048 */
4049 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4050
4051 /* RXS/TXS (Rx/Tx clock source)
4052 * 07 Reserved, must be 0
4053 * 06..04 Clock Source, 000=RxC/TxC Pin
4054 * 03..00 Clock Divisor, 0000=1
4055 */
4056 write_reg(info, RXS, 0x00);
4057 write_reg(info, TXS, 0x00);
4058 }
4059
4060 /* set LinkSpeed if available, otherwise default to 2Mbps */
4061 if (info->params.clock_speed)
4062 set_rate(info, info->params.clock_speed);
4063 else
4064 set_rate(info, 3686400);
4065 }
4066
4067 /* Set the baud rate register to the desired speed
4068 *
4069 * data_rate data rate of clock in bits per second
4070 * A data rate of 0 disables the AUX clock.
4071 */
set_rate(SLMP_INFO * info,u32 data_rate)4072 static void set_rate( SLMP_INFO *info, u32 data_rate )
4073 {
4074 u32 TMCValue;
4075 unsigned char BRValue;
4076 u32 Divisor=0;
4077
4078 /* fBRG = fCLK/(TMC * 2^BR)
4079 */
4080 if (data_rate != 0) {
4081 Divisor = 14745600/data_rate;
4082 if (!Divisor)
4083 Divisor = 1;
4084
4085 TMCValue = Divisor;
4086
4087 BRValue = 0;
4088 if (TMCValue != 1 && TMCValue != 2) {
4089 /* BRValue of 0 provides 50/50 duty cycle *only* when
4090 * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4091 * 50/50 duty cycle.
4092 */
4093 BRValue = 1;
4094 TMCValue >>= 1;
4095 }
4096
4097 /* while TMCValue is too big for TMC register, divide
4098 * by 2 and increment BR exponent.
4099 */
4100 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4101 TMCValue >>= 1;
4102
4103 write_reg(info, TXS,
4104 (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4105 write_reg(info, RXS,
4106 (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4107 write_reg(info, TMC, (unsigned char)TMCValue);
4108 }
4109 else {
4110 write_reg(info, TXS,0);
4111 write_reg(info, RXS,0);
4112 write_reg(info, TMC, 0);
4113 }
4114 }
4115
4116 /* Disable receiver
4117 */
rx_stop(SLMP_INFO * info)4118 static void rx_stop(SLMP_INFO *info)
4119 {
4120 if (debug_level >= DEBUG_LEVEL_ISR)
4121 printk("%s(%d):%s rx_stop()\n",
4122 __FILE__,__LINE__, info->device_name );
4123
4124 write_reg(info, CMD, RXRESET);
4125
4126 info->ie0_value &= ~RXRDYE;
4127 write_reg(info, IE0, info->ie0_value); /* disable Rx data interrupts */
4128
4129 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4130 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4131 write_reg(info, RXDMA + DIR, 0); /* disable Rx DMA interrupts */
4132
4133 info->rx_enabled = false;
4134 info->rx_overflow = false;
4135 }
4136
4137 /* enable the receiver
4138 */
rx_start(SLMP_INFO * info)4139 static void rx_start(SLMP_INFO *info)
4140 {
4141 int i;
4142
4143 if (debug_level >= DEBUG_LEVEL_ISR)
4144 printk("%s(%d):%s rx_start()\n",
4145 __FILE__,__LINE__, info->device_name );
4146
4147 write_reg(info, CMD, RXRESET);
4148
4149 if ( info->params.mode == MGSL_MODE_HDLC ) {
4150 /* HDLC, disabe IRQ on rxdata */
4151 info->ie0_value &= ~RXRDYE;
4152 write_reg(info, IE0, info->ie0_value);
4153
4154 /* Reset all Rx DMA buffers and program rx dma */
4155 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4156 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4157
4158 for (i = 0; i < info->rx_buf_count; i++) {
4159 info->rx_buf_list[i].status = 0xff;
4160
4161 // throttle to 4 shared memory writes at a time to prevent
4162 // hogging local bus (keep latency time for DMA requests low).
4163 if (!(i % 4))
4164 read_status_reg(info);
4165 }
4166 info->current_rx_buf = 0;
4167
4168 /* set current/1st descriptor address */
4169 write_reg16(info, RXDMA + CDA,
4170 info->rx_buf_list_ex[0].phys_entry);
4171
4172 /* set new last rx descriptor address */
4173 write_reg16(info, RXDMA + EDA,
4174 info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4175
4176 /* set buffer length (shared by all rx dma data buffers) */
4177 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4178
4179 write_reg(info, RXDMA + DIR, 0x60); /* enable Rx DMA interrupts (EOM/BOF) */
4180 write_reg(info, RXDMA + DSR, 0xf2); /* clear Rx DMA IRQs, enable Rx DMA */
4181 } else {
4182 /* async, enable IRQ on rxdata */
4183 info->ie0_value |= RXRDYE;
4184 write_reg(info, IE0, info->ie0_value);
4185 }
4186
4187 write_reg(info, CMD, RXENABLE);
4188
4189 info->rx_overflow = false;
4190 info->rx_enabled = true;
4191 }
4192
4193 /* Enable the transmitter and send a transmit frame if
4194 * one is loaded in the DMA buffers.
4195 */
tx_start(SLMP_INFO * info)4196 static void tx_start(SLMP_INFO *info)
4197 {
4198 if (debug_level >= DEBUG_LEVEL_ISR)
4199 printk("%s(%d):%s tx_start() tx_count=%d\n",
4200 __FILE__,__LINE__, info->device_name,info->tx_count );
4201
4202 if (!info->tx_enabled ) {
4203 write_reg(info, CMD, TXRESET);
4204 write_reg(info, CMD, TXENABLE);
4205 info->tx_enabled = true;
4206 }
4207
4208 if ( info->tx_count ) {
4209
4210 /* If auto RTS enabled and RTS is inactive, then assert */
4211 /* RTS and set a flag indicating that the driver should */
4212 /* negate RTS when the transmission completes. */
4213
4214 info->drop_rts_on_tx_done = false;
4215
4216 if (info->params.mode != MGSL_MODE_ASYNC) {
4217
4218 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4219 get_signals( info );
4220 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4221 info->serial_signals |= SerialSignal_RTS;
4222 set_signals( info );
4223 info->drop_rts_on_tx_done = true;
4224 }
4225 }
4226
4227 write_reg16(info, TRC0,
4228 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4229
4230 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4231 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4232
4233 /* set TX CDA (current descriptor address) */
4234 write_reg16(info, TXDMA + CDA,
4235 info->tx_buf_list_ex[0].phys_entry);
4236
4237 /* set TX EDA (last descriptor address) */
4238 write_reg16(info, TXDMA + EDA,
4239 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4240
4241 /* enable underrun IRQ */
4242 info->ie1_value &= ~IDLE;
4243 info->ie1_value |= UDRN;
4244 write_reg(info, IE1, info->ie1_value);
4245 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4246
4247 write_reg(info, TXDMA + DIR, 0x40); /* enable Tx DMA interrupts (EOM) */
4248 write_reg(info, TXDMA + DSR, 0xf2); /* clear Tx DMA IRQs, enable Tx DMA */
4249
4250 mod_timer(&info->tx_timer, jiffies +
4251 msecs_to_jiffies(5000));
4252 }
4253 else {
4254 tx_load_fifo(info);
4255 /* async, enable IRQ on txdata */
4256 info->ie0_value |= TXRDYE;
4257 write_reg(info, IE0, info->ie0_value);
4258 }
4259
4260 info->tx_active = true;
4261 }
4262 }
4263
4264 /* stop the transmitter and DMA
4265 */
tx_stop(SLMP_INFO * info)4266 static void tx_stop( SLMP_INFO *info )
4267 {
4268 if (debug_level >= DEBUG_LEVEL_ISR)
4269 printk("%s(%d):%s tx_stop()\n",
4270 __FILE__,__LINE__, info->device_name );
4271
4272 del_timer(&info->tx_timer);
4273
4274 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4275 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4276
4277 write_reg(info, CMD, TXRESET);
4278
4279 info->ie1_value &= ~(UDRN + IDLE);
4280 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
4281 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
4282
4283 info->ie0_value &= ~TXRDYE;
4284 write_reg(info, IE0, info->ie0_value); /* disable tx data interrupts */
4285
4286 info->tx_enabled = false;
4287 info->tx_active = false;
4288 }
4289
4290 /* Fill the transmit FIFO until the FIFO is full or
4291 * there is no more data to load.
4292 */
tx_load_fifo(SLMP_INFO * info)4293 static void tx_load_fifo(SLMP_INFO *info)
4294 {
4295 u8 TwoBytes[2];
4296
4297 /* do nothing is now tx data available and no XON/XOFF pending */
4298
4299 if ( !info->tx_count && !info->x_char )
4300 return;
4301
4302 /* load the Transmit FIFO until FIFOs full or all data sent */
4303
4304 while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4305
4306 /* there is more space in the transmit FIFO and */
4307 /* there is more data in transmit buffer */
4308
4309 if ( (info->tx_count > 1) && !info->x_char ) {
4310 /* write 16-bits */
4311 TwoBytes[0] = info->tx_buf[info->tx_get++];
4312 if (info->tx_get >= info->max_frame_size)
4313 info->tx_get -= info->max_frame_size;
4314 TwoBytes[1] = info->tx_buf[info->tx_get++];
4315 if (info->tx_get >= info->max_frame_size)
4316 info->tx_get -= info->max_frame_size;
4317
4318 write_reg16(info, TRB, *((u16 *)TwoBytes));
4319
4320 info->tx_count -= 2;
4321 info->icount.tx += 2;
4322 } else {
4323 /* only 1 byte left to transmit or 1 FIFO slot left */
4324
4325 if (info->x_char) {
4326 /* transmit pending high priority char */
4327 write_reg(info, TRB, info->x_char);
4328 info->x_char = 0;
4329 } else {
4330 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4331 if (info->tx_get >= info->max_frame_size)
4332 info->tx_get -= info->max_frame_size;
4333 info->tx_count--;
4334 }
4335 info->icount.tx++;
4336 }
4337 }
4338 }
4339
4340 /* Reset a port to a known state
4341 */
reset_port(SLMP_INFO * info)4342 static void reset_port(SLMP_INFO *info)
4343 {
4344 if (info->sca_base) {
4345
4346 tx_stop(info);
4347 rx_stop(info);
4348
4349 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4350 set_signals(info);
4351
4352 /* disable all port interrupts */
4353 info->ie0_value = 0;
4354 info->ie1_value = 0;
4355 info->ie2_value = 0;
4356 write_reg(info, IE0, info->ie0_value);
4357 write_reg(info, IE1, info->ie1_value);
4358 write_reg(info, IE2, info->ie2_value);
4359
4360 write_reg(info, CMD, CHRESET);
4361 }
4362 }
4363
4364 /* Reset all the ports to a known state.
4365 */
reset_adapter(SLMP_INFO * info)4366 static void reset_adapter(SLMP_INFO *info)
4367 {
4368 int i;
4369
4370 for ( i=0; i < SCA_MAX_PORTS; ++i) {
4371 if (info->port_array[i])
4372 reset_port(info->port_array[i]);
4373 }
4374 }
4375
4376 /* Program port for asynchronous communications.
4377 */
async_mode(SLMP_INFO * info)4378 static void async_mode(SLMP_INFO *info)
4379 {
4380
4381 unsigned char RegValue;
4382
4383 tx_stop(info);
4384 rx_stop(info);
4385
4386 /* MD0, Mode Register 0
4387 *
4388 * 07..05 PRCTL<2..0>, Protocol Mode, 000=async
4389 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4390 * 03 Reserved, must be 0
4391 * 02 CRCCC, CRC Calculation, 0=disabled
4392 * 01..00 STOP<1..0> Stop bits (00=1,10=2)
4393 *
4394 * 0000 0000
4395 */
4396 RegValue = 0x00;
4397 if (info->params.stop_bits != 1)
4398 RegValue |= BIT1;
4399 write_reg(info, MD0, RegValue);
4400
4401 /* MD1, Mode Register 1
4402 *
4403 * 07..06 BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4404 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4405 * 03..02 RXCHR<1..0>, rx char size
4406 * 01..00 PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4407 *
4408 * 0100 0000
4409 */
4410 RegValue = 0x40;
4411 switch (info->params.data_bits) {
4412 case 7: RegValue |= BIT4 + BIT2; break;
4413 case 6: RegValue |= BIT5 + BIT3; break;
4414 case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4415 }
4416 if (info->params.parity != ASYNC_PARITY_NONE) {
4417 RegValue |= BIT1;
4418 if (info->params.parity == ASYNC_PARITY_ODD)
4419 RegValue |= BIT0;
4420 }
4421 write_reg(info, MD1, RegValue);
4422
4423 /* MD2, Mode Register 2
4424 *
4425 * 07..02 Reserved, must be 0
4426 * 01..00 CNCT<1..0> Channel connection, 00=normal 11=local loopback
4427 *
4428 * 0000 0000
4429 */
4430 RegValue = 0x00;
4431 if (info->params.loopback)
4432 RegValue |= (BIT1 + BIT0);
4433 write_reg(info, MD2, RegValue);
4434
4435 /* RXS, Receive clock source
4436 *
4437 * 07 Reserved, must be 0
4438 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4439 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4440 */
4441 RegValue=BIT6;
4442 write_reg(info, RXS, RegValue);
4443
4444 /* TXS, Transmit clock source
4445 *
4446 * 07 Reserved, must be 0
4447 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4448 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4449 */
4450 RegValue=BIT6;
4451 write_reg(info, TXS, RegValue);
4452
4453 /* Control Register
4454 *
4455 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4456 */
4457 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4458 write_control_reg(info);
4459
4460 tx_set_idle(info);
4461
4462 /* RRC Receive Ready Control 0
4463 *
4464 * 07..05 Reserved, must be 0
4465 * 04..00 RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4466 */
4467 write_reg(info, RRC, 0x00);
4468
4469 /* TRC0 Transmit Ready Control 0
4470 *
4471 * 07..05 Reserved, must be 0
4472 * 04..00 TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4473 */
4474 write_reg(info, TRC0, 0x10);
4475
4476 /* TRC1 Transmit Ready Control 1
4477 *
4478 * 07..05 Reserved, must be 0
4479 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4480 */
4481 write_reg(info, TRC1, 0x1e);
4482
4483 /* CTL, MSCI control register
4484 *
4485 * 07..06 Reserved, set to 0
4486 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4487 * 04 IDLC, idle control, 0=mark 1=idle register
4488 * 03 BRK, break, 0=off 1 =on (async)
4489 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4490 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4491 * 00 RTS, RTS output control, 0=active 1=inactive
4492 *
4493 * 0001 0001
4494 */
4495 RegValue = 0x10;
4496 if (!(info->serial_signals & SerialSignal_RTS))
4497 RegValue |= 0x01;
4498 write_reg(info, CTL, RegValue);
4499
4500 /* enable status interrupts */
4501 info->ie0_value |= TXINTE + RXINTE;
4502 write_reg(info, IE0, info->ie0_value);
4503
4504 /* enable break detect interrupt */
4505 info->ie1_value = BRKD;
4506 write_reg(info, IE1, info->ie1_value);
4507
4508 /* enable rx overrun interrupt */
4509 info->ie2_value = OVRN;
4510 write_reg(info, IE2, info->ie2_value);
4511
4512 set_rate( info, info->params.data_rate * 16 );
4513 }
4514
4515 /* Program the SCA for HDLC communications.
4516 */
hdlc_mode(SLMP_INFO * info)4517 static void hdlc_mode(SLMP_INFO *info)
4518 {
4519 unsigned char RegValue;
4520 u32 DpllDivisor;
4521
4522 // Can't use DPLL because SCA outputs recovered clock on RxC when
4523 // DPLL mode selected. This causes output contention with RxC receiver.
4524 // Use of DPLL would require external hardware to disable RxC receiver
4525 // when DPLL mode selected.
4526 info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4527
4528 /* disable DMA interrupts */
4529 write_reg(info, TXDMA + DIR, 0);
4530 write_reg(info, RXDMA + DIR, 0);
4531
4532 /* MD0, Mode Register 0
4533 *
4534 * 07..05 PRCTL<2..0>, Protocol Mode, 100=HDLC
4535 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4536 * 03 Reserved, must be 0
4537 * 02 CRCCC, CRC Calculation, 1=enabled
4538 * 01 CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4539 * 00 CRC0, CRC initial value, 1 = all 1s
4540 *
4541 * 1000 0001
4542 */
4543 RegValue = 0x81;
4544 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4545 RegValue |= BIT4;
4546 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4547 RegValue |= BIT4;
4548 if (info->params.crc_type == HDLC_CRC_16_CCITT)
4549 RegValue |= BIT2 + BIT1;
4550 write_reg(info, MD0, RegValue);
4551
4552 /* MD1, Mode Register 1
4553 *
4554 * 07..06 ADDRS<1..0>, Address detect, 00=no addr check
4555 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits
4556 * 03..02 RXCHR<1..0>, rx char size, 00=8 bits
4557 * 01..00 PMPM<1..0>, Parity mode, 00=no parity
4558 *
4559 * 0000 0000
4560 */
4561 RegValue = 0x00;
4562 write_reg(info, MD1, RegValue);
4563
4564 /* MD2, Mode Register 2
4565 *
4566 * 07 NRZFM, 0=NRZ, 1=FM
4567 * 06..05 CODE<1..0> Encoding, 00=NRZ
4568 * 04..03 DRATE<1..0> DPLL Divisor, 00=8
4569 * 02 Reserved, must be 0
4570 * 01..00 CNCT<1..0> Channel connection, 0=normal
4571 *
4572 * 0000 0000
4573 */
4574 RegValue = 0x00;
4575 switch(info->params.encoding) {
4576 case HDLC_ENCODING_NRZI: RegValue |= BIT5; break;
4577 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4578 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4579 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break; /* aka Manchester */
4580 #if 0
4581 case HDLC_ENCODING_NRZB: /* not supported */
4582 case HDLC_ENCODING_NRZI_MARK: /* not supported */
4583 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: /* not supported */
4584 #endif
4585 }
4586 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4587 DpllDivisor = 16;
4588 RegValue |= BIT3;
4589 } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4590 DpllDivisor = 8;
4591 } else {
4592 DpllDivisor = 32;
4593 RegValue |= BIT4;
4594 }
4595 write_reg(info, MD2, RegValue);
4596
4597
4598 /* RXS, Receive clock source
4599 *
4600 * 07 Reserved, must be 0
4601 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4602 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4603 */
4604 RegValue=0;
4605 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4606 RegValue |= BIT6;
4607 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4608 RegValue |= BIT6 + BIT5;
4609 write_reg(info, RXS, RegValue);
4610
4611 /* TXS, Transmit clock source
4612 *
4613 * 07 Reserved, must be 0
4614 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4615 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4616 */
4617 RegValue=0;
4618 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4619 RegValue |= BIT6;
4620 if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4621 RegValue |= BIT6 + BIT5;
4622 write_reg(info, TXS, RegValue);
4623
4624 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4625 set_rate(info, info->params.clock_speed * DpllDivisor);
4626 else
4627 set_rate(info, info->params.clock_speed);
4628
4629 /* GPDATA (General Purpose I/O Data Register)
4630 *
4631 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4632 */
4633 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4634 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4635 else
4636 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4637 write_control_reg(info);
4638
4639 /* RRC Receive Ready Control 0
4640 *
4641 * 07..05 Reserved, must be 0
4642 * 04..00 RRC<4..0> Rx FIFO trigger active
4643 */
4644 write_reg(info, RRC, rx_active_fifo_level);
4645
4646 /* TRC0 Transmit Ready Control 0
4647 *
4648 * 07..05 Reserved, must be 0
4649 * 04..00 TRC<4..0> Tx FIFO trigger active
4650 */
4651 write_reg(info, TRC0, tx_active_fifo_level);
4652
4653 /* TRC1 Transmit Ready Control 1
4654 *
4655 * 07..05 Reserved, must be 0
4656 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4657 */
4658 write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4659
4660 /* DMR, DMA Mode Register
4661 *
4662 * 07..05 Reserved, must be 0
4663 * 04 TMOD, Transfer Mode: 1=chained-block
4664 * 03 Reserved, must be 0
4665 * 02 NF, Number of Frames: 1=multi-frame
4666 * 01 CNTE, Frame End IRQ Counter enable: 0=disabled
4667 * 00 Reserved, must be 0
4668 *
4669 * 0001 0100
4670 */
4671 write_reg(info, TXDMA + DMR, 0x14);
4672 write_reg(info, RXDMA + DMR, 0x14);
4673
4674 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4675 write_reg(info, RXDMA + CPB,
4676 (unsigned char)(info->buffer_list_phys >> 16));
4677
4678 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4679 write_reg(info, TXDMA + CPB,
4680 (unsigned char)(info->buffer_list_phys >> 16));
4681
4682 /* enable status interrupts. other code enables/disables
4683 * the individual sources for these two interrupt classes.
4684 */
4685 info->ie0_value |= TXINTE + RXINTE;
4686 write_reg(info, IE0, info->ie0_value);
4687
4688 /* CTL, MSCI control register
4689 *
4690 * 07..06 Reserved, set to 0
4691 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4692 * 04 IDLC, idle control, 0=mark 1=idle register
4693 * 03 BRK, break, 0=off 1 =on (async)
4694 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4695 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4696 * 00 RTS, RTS output control, 0=active 1=inactive
4697 *
4698 * 0001 0001
4699 */
4700 RegValue = 0x10;
4701 if (!(info->serial_signals & SerialSignal_RTS))
4702 RegValue |= 0x01;
4703 write_reg(info, CTL, RegValue);
4704
4705 /* preamble not supported ! */
4706
4707 tx_set_idle(info);
4708 tx_stop(info);
4709 rx_stop(info);
4710
4711 set_rate(info, info->params.clock_speed);
4712
4713 if (info->params.loopback)
4714 enable_loopback(info,1);
4715 }
4716
4717 /* Set the transmit HDLC idle mode
4718 */
tx_set_idle(SLMP_INFO * info)4719 static void tx_set_idle(SLMP_INFO *info)
4720 {
4721 unsigned char RegValue = 0xff;
4722
4723 /* Map API idle mode to SCA register bits */
4724 switch(info->idle_mode) {
4725 case HDLC_TXIDLE_FLAGS: RegValue = 0x7e; break;
4726 case HDLC_TXIDLE_ALT_ZEROS_ONES: RegValue = 0xaa; break;
4727 case HDLC_TXIDLE_ZEROS: RegValue = 0x00; break;
4728 case HDLC_TXIDLE_ONES: RegValue = 0xff; break;
4729 case HDLC_TXIDLE_ALT_MARK_SPACE: RegValue = 0xaa; break;
4730 case HDLC_TXIDLE_SPACE: RegValue = 0x00; break;
4731 case HDLC_TXIDLE_MARK: RegValue = 0xff; break;
4732 }
4733
4734 write_reg(info, IDL, RegValue);
4735 }
4736
4737 /* Query the adapter for the state of the V24 status (input) signals.
4738 */
get_signals(SLMP_INFO * info)4739 static void get_signals(SLMP_INFO *info)
4740 {
4741 u16 status = read_reg(info, SR3);
4742 u16 gpstatus = read_status_reg(info);
4743 u16 testbit;
4744
4745 /* clear all serial signals except DTR and RTS */
4746 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4747
4748 /* set serial signal bits to reflect MISR */
4749
4750 if (!(status & BIT3))
4751 info->serial_signals |= SerialSignal_CTS;
4752
4753 if ( !(status & BIT2))
4754 info->serial_signals |= SerialSignal_DCD;
4755
4756 testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4757 if (!(gpstatus & testbit))
4758 info->serial_signals |= SerialSignal_RI;
4759
4760 testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4761 if (!(gpstatus & testbit))
4762 info->serial_signals |= SerialSignal_DSR;
4763 }
4764
4765 /* Set the state of DTR and RTS based on contents of
4766 * serial_signals member of device context.
4767 */
set_signals(SLMP_INFO * info)4768 static void set_signals(SLMP_INFO *info)
4769 {
4770 unsigned char RegValue;
4771 u16 EnableBit;
4772
4773 RegValue = read_reg(info, CTL);
4774 if (info->serial_signals & SerialSignal_RTS)
4775 RegValue &= ~BIT0;
4776 else
4777 RegValue |= BIT0;
4778 write_reg(info, CTL, RegValue);
4779
4780 // Port 0..3 DTR is ctrl reg <1,3,5,7>
4781 EnableBit = BIT1 << (info->port_num*2);
4782 if (info->serial_signals & SerialSignal_DTR)
4783 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4784 else
4785 info->port_array[0]->ctrlreg_value |= EnableBit;
4786 write_control_reg(info);
4787 }
4788
4789 /*******************/
4790 /* DMA Buffer Code */
4791 /*******************/
4792
4793 /* Set the count for all receive buffers to SCABUFSIZE
4794 * and set the current buffer to the first buffer. This effectively
4795 * makes all buffers free and discards any data in buffers.
4796 */
rx_reset_buffers(SLMP_INFO * info)4797 static void rx_reset_buffers(SLMP_INFO *info)
4798 {
4799 rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4800 }
4801
4802 /* Free the buffers used by a received frame
4803 *
4804 * info pointer to device instance data
4805 * first index of 1st receive buffer of frame
4806 * last index of last receive buffer of frame
4807 */
rx_free_frame_buffers(SLMP_INFO * info,unsigned int first,unsigned int last)4808 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4809 {
4810 bool done = false;
4811
4812 while(!done) {
4813 /* reset current buffer for reuse */
4814 info->rx_buf_list[first].status = 0xff;
4815
4816 if (first == last) {
4817 done = true;
4818 /* set new last rx descriptor address */
4819 write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4820 }
4821
4822 first++;
4823 if (first == info->rx_buf_count)
4824 first = 0;
4825 }
4826
4827 /* set current buffer to next buffer after last buffer of frame */
4828 info->current_rx_buf = first;
4829 }
4830
4831 /* Return a received frame from the receive DMA buffers.
4832 * Only frames received without errors are returned.
4833 *
4834 * Return Value: true if frame returned, otherwise false
4835 */
rx_get_frame(SLMP_INFO * info)4836 static bool rx_get_frame(SLMP_INFO *info)
4837 {
4838 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
4839 unsigned short status;
4840 unsigned int framesize = 0;
4841 bool ReturnCode = false;
4842 unsigned long flags;
4843 struct tty_struct *tty = info->port.tty;
4844 unsigned char addr_field = 0xff;
4845 SCADESC *desc;
4846 SCADESC_EX *desc_ex;
4847
4848 CheckAgain:
4849 /* assume no frame returned, set zero length */
4850 framesize = 0;
4851 addr_field = 0xff;
4852
4853 /*
4854 * current_rx_buf points to the 1st buffer of the next available
4855 * receive frame. To find the last buffer of the frame look for
4856 * a non-zero status field in the buffer entries. (The status
4857 * field is set by the 16C32 after completing a receive frame.
4858 */
4859 StartIndex = EndIndex = info->current_rx_buf;
4860
4861 for ( ;; ) {
4862 desc = &info->rx_buf_list[EndIndex];
4863 desc_ex = &info->rx_buf_list_ex[EndIndex];
4864
4865 if (desc->status == 0xff)
4866 goto Cleanup; /* current desc still in use, no frames available */
4867
4868 if (framesize == 0 && info->params.addr_filter != 0xff)
4869 addr_field = desc_ex->virt_addr[0];
4870
4871 framesize += desc->length;
4872
4873 /* Status != 0 means last buffer of frame */
4874 if (desc->status)
4875 break;
4876
4877 EndIndex++;
4878 if (EndIndex == info->rx_buf_count)
4879 EndIndex = 0;
4880
4881 if (EndIndex == info->current_rx_buf) {
4882 /* all buffers have been 'used' but none mark */
4883 /* the end of a frame. Reset buffers and receiver. */
4884 if ( info->rx_enabled ){
4885 spin_lock_irqsave(&info->lock,flags);
4886 rx_start(info);
4887 spin_unlock_irqrestore(&info->lock,flags);
4888 }
4889 goto Cleanup;
4890 }
4891
4892 }
4893
4894 /* check status of receive frame */
4895
4896 /* frame status is byte stored after frame data
4897 *
4898 * 7 EOM (end of msg), 1 = last buffer of frame
4899 * 6 Short Frame, 1 = short frame
4900 * 5 Abort, 1 = frame aborted
4901 * 4 Residue, 1 = last byte is partial
4902 * 3 Overrun, 1 = overrun occurred during frame reception
4903 * 2 CRC, 1 = CRC error detected
4904 *
4905 */
4906 status = desc->status;
4907
4908 /* ignore CRC bit if not using CRC (bit is undefined) */
4909 /* Note:CRC is not save to data buffer */
4910 if (info->params.crc_type == HDLC_CRC_NONE)
4911 status &= ~BIT2;
4912
4913 if (framesize == 0 ||
4914 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4915 /* discard 0 byte frames, this seems to occur sometime
4916 * when remote is idling flags.
4917 */
4918 rx_free_frame_buffers(info, StartIndex, EndIndex);
4919 goto CheckAgain;
4920 }
4921
4922 if (framesize < 2)
4923 status |= BIT6;
4924
4925 if (status & (BIT6+BIT5+BIT3+BIT2)) {
4926 /* received frame has errors,
4927 * update counts and mark frame size as 0
4928 */
4929 if (status & BIT6)
4930 info->icount.rxshort++;
4931 else if (status & BIT5)
4932 info->icount.rxabort++;
4933 else if (status & BIT3)
4934 info->icount.rxover++;
4935 else
4936 info->icount.rxcrc++;
4937
4938 framesize = 0;
4939 #if SYNCLINK_GENERIC_HDLC
4940 {
4941 info->netdev->stats.rx_errors++;
4942 info->netdev->stats.rx_frame_errors++;
4943 }
4944 #endif
4945 }
4946
4947 if ( debug_level >= DEBUG_LEVEL_BH )
4948 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4949 __FILE__,__LINE__,info->device_name,status,framesize);
4950
4951 if ( debug_level >= DEBUG_LEVEL_DATA )
4952 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4953 min_t(unsigned int, framesize, SCABUFSIZE), 0);
4954
4955 if (framesize) {
4956 if (framesize > info->max_frame_size)
4957 info->icount.rxlong++;
4958 else {
4959 /* copy dma buffer(s) to contiguous intermediate buffer */
4960 int copy_count = framesize;
4961 int index = StartIndex;
4962 unsigned char *ptmp = info->tmp_rx_buf;
4963 info->tmp_rx_buf_count = framesize;
4964
4965 info->icount.rxok++;
4966
4967 while(copy_count) {
4968 int partial_count = min(copy_count,SCABUFSIZE);
4969 memcpy( ptmp,
4970 info->rx_buf_list_ex[index].virt_addr,
4971 partial_count );
4972 ptmp += partial_count;
4973 copy_count -= partial_count;
4974
4975 if ( ++index == info->rx_buf_count )
4976 index = 0;
4977 }
4978
4979 #if SYNCLINK_GENERIC_HDLC
4980 if (info->netcount)
4981 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4982 else
4983 #endif
4984 ldisc_receive_buf(tty,info->tmp_rx_buf,
4985 info->flag_buf, framesize);
4986 }
4987 }
4988 /* Free the buffers used by this frame. */
4989 rx_free_frame_buffers( info, StartIndex, EndIndex );
4990
4991 ReturnCode = true;
4992
4993 Cleanup:
4994 if ( info->rx_enabled && info->rx_overflow ) {
4995 /* Receiver is enabled, but needs to restarted due to
4996 * rx buffer overflow. If buffers are empty, restart receiver.
4997 */
4998 if (info->rx_buf_list[EndIndex].status == 0xff) {
4999 spin_lock_irqsave(&info->lock,flags);
5000 rx_start(info);
5001 spin_unlock_irqrestore(&info->lock,flags);
5002 }
5003 }
5004
5005 return ReturnCode;
5006 }
5007
5008 /* load the transmit DMA buffer with data
5009 */
tx_load_dma_buffer(SLMP_INFO * info,const char * buf,unsigned int count)5010 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5011 {
5012 unsigned short copy_count;
5013 unsigned int i = 0;
5014 SCADESC *desc;
5015 SCADESC_EX *desc_ex;
5016
5017 if ( debug_level >= DEBUG_LEVEL_DATA )
5018 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5019
5020 /* Copy source buffer to one or more DMA buffers, starting with
5021 * the first transmit dma buffer.
5022 */
5023 for(i=0;;)
5024 {
5025 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5026
5027 desc = &info->tx_buf_list[i];
5028 desc_ex = &info->tx_buf_list_ex[i];
5029
5030 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5031
5032 desc->length = copy_count;
5033 desc->status = 0;
5034
5035 buf += copy_count;
5036 count -= copy_count;
5037
5038 if (!count)
5039 break;
5040
5041 i++;
5042 if (i >= info->tx_buf_count)
5043 i = 0;
5044 }
5045
5046 info->tx_buf_list[i].status = 0x81; /* set EOM and EOT status */
5047 info->last_tx_buf = ++i;
5048 }
5049
register_test(SLMP_INFO * info)5050 static bool register_test(SLMP_INFO *info)
5051 {
5052 static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5053 static unsigned int count = ARRAY_SIZE(testval);
5054 unsigned int i;
5055 bool rc = true;
5056 unsigned long flags;
5057
5058 spin_lock_irqsave(&info->lock,flags);
5059 reset_port(info);
5060
5061 /* assume failure */
5062 info->init_error = DiagStatus_AddressFailure;
5063
5064 /* Write bit patterns to various registers but do it out of */
5065 /* sync, then read back and verify values. */
5066
5067 for (i = 0 ; i < count ; i++) {
5068 write_reg(info, TMC, testval[i]);
5069 write_reg(info, IDL, testval[(i+1)%count]);
5070 write_reg(info, SA0, testval[(i+2)%count]);
5071 write_reg(info, SA1, testval[(i+3)%count]);
5072
5073 if ( (read_reg(info, TMC) != testval[i]) ||
5074 (read_reg(info, IDL) != testval[(i+1)%count]) ||
5075 (read_reg(info, SA0) != testval[(i+2)%count]) ||
5076 (read_reg(info, SA1) != testval[(i+3)%count]) )
5077 {
5078 rc = false;
5079 break;
5080 }
5081 }
5082
5083 reset_port(info);
5084 spin_unlock_irqrestore(&info->lock,flags);
5085
5086 return rc;
5087 }
5088
irq_test(SLMP_INFO * info)5089 static bool irq_test(SLMP_INFO *info)
5090 {
5091 unsigned long timeout;
5092 unsigned long flags;
5093
5094 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5095
5096 spin_lock_irqsave(&info->lock,flags);
5097 reset_port(info);
5098
5099 /* assume failure */
5100 info->init_error = DiagStatus_IrqFailure;
5101 info->irq_occurred = false;
5102
5103 /* setup timer0 on SCA0 to interrupt */
5104
5105 /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5106 write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5107
5108 write_reg(info, (unsigned char)(timer + TEPR), 0); /* timer expand prescale */
5109 write_reg16(info, (unsigned char)(timer + TCONR), 1); /* timer constant */
5110
5111
5112 /* TMCS, Timer Control/Status Register
5113 *
5114 * 07 CMF, Compare match flag (read only) 1=match
5115 * 06 ECMI, CMF Interrupt Enable: 1=enabled
5116 * 05 Reserved, must be 0
5117 * 04 TME, Timer Enable
5118 * 03..00 Reserved, must be 0
5119 *
5120 * 0101 0000
5121 */
5122 write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5123
5124 spin_unlock_irqrestore(&info->lock,flags);
5125
5126 timeout=100;
5127 while( timeout-- && !info->irq_occurred ) {
5128 msleep_interruptible(10);
5129 }
5130
5131 spin_lock_irqsave(&info->lock,flags);
5132 reset_port(info);
5133 spin_unlock_irqrestore(&info->lock,flags);
5134
5135 return info->irq_occurred;
5136 }
5137
5138 /* initialize individual SCA device (2 ports)
5139 */
sca_init(SLMP_INFO * info)5140 static bool sca_init(SLMP_INFO *info)
5141 {
5142 /* set wait controller to single mem partition (low), no wait states */
5143 write_reg(info, PABR0, 0); /* wait controller addr boundary 0 */
5144 write_reg(info, PABR1, 0); /* wait controller addr boundary 1 */
5145 write_reg(info, WCRL, 0); /* wait controller low range */
5146 write_reg(info, WCRM, 0); /* wait controller mid range */
5147 write_reg(info, WCRH, 0); /* wait controller high range */
5148
5149 /* DPCR, DMA Priority Control
5150 *
5151 * 07..05 Not used, must be 0
5152 * 04 BRC, bus release condition: 0=all transfers complete
5153 * 03 CCC, channel change condition: 0=every cycle
5154 * 02..00 PR<2..0>, priority 100=round robin
5155 *
5156 * 00000100 = 0x04
5157 */
5158 write_reg(info, DPCR, dma_priority);
5159
5160 /* DMA Master Enable, BIT7: 1=enable all channels */
5161 write_reg(info, DMER, 0x80);
5162
5163 /* enable all interrupt classes */
5164 write_reg(info, IER0, 0xff); /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5165 write_reg(info, IER1, 0xff); /* DMIB,DMIA (channels 0-3) */
5166 write_reg(info, IER2, 0xf0); /* TIRQ (timers 0-3) */
5167
5168 /* ITCR, interrupt control register
5169 * 07 IPC, interrupt priority, 0=MSCI->DMA
5170 * 06..05 IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5171 * 04 VOS, Vector Output, 0=unmodified vector
5172 * 03..00 Reserved, must be 0
5173 */
5174 write_reg(info, ITCR, 0);
5175
5176 return true;
5177 }
5178
5179 /* initialize adapter hardware
5180 */
init_adapter(SLMP_INFO * info)5181 static bool init_adapter(SLMP_INFO *info)
5182 {
5183 int i;
5184
5185 /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5186 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5187 u32 readval;
5188
5189 info->misc_ctrl_value |= BIT30;
5190 *MiscCtrl = info->misc_ctrl_value;
5191
5192 /*
5193 * Force at least 170ns delay before clearing
5194 * reset bit. Each read from LCR takes at least
5195 * 30ns so 10 times for 300ns to be safe.
5196 */
5197 for(i=0;i<10;i++)
5198 readval = *MiscCtrl;
5199
5200 info->misc_ctrl_value &= ~BIT30;
5201 *MiscCtrl = info->misc_ctrl_value;
5202
5203 /* init control reg (all DTRs off, all clksel=input) */
5204 info->ctrlreg_value = 0xaa;
5205 write_control_reg(info);
5206
5207 {
5208 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5209 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5210
5211 switch(read_ahead_count)
5212 {
5213 case 16:
5214 lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5215 break;
5216 case 8:
5217 lcr1_brdr_value |= BIT5 + BIT4;
5218 break;
5219 case 4:
5220 lcr1_brdr_value |= BIT5 + BIT3;
5221 break;
5222 case 0:
5223 lcr1_brdr_value |= BIT5;
5224 break;
5225 }
5226
5227 *LCR1BRDR = lcr1_brdr_value;
5228 *MiscCtrl = misc_ctrl_value;
5229 }
5230
5231 sca_init(info->port_array[0]);
5232 sca_init(info->port_array[2]);
5233
5234 return true;
5235 }
5236
5237 /* Loopback an HDLC frame to test the hardware
5238 * interrupt and DMA functions.
5239 */
loopback_test(SLMP_INFO * info)5240 static bool loopback_test(SLMP_INFO *info)
5241 {
5242 #define TESTFRAMESIZE 20
5243
5244 unsigned long timeout;
5245 u16 count = TESTFRAMESIZE;
5246 unsigned char buf[TESTFRAMESIZE];
5247 bool rc = false;
5248 unsigned long flags;
5249
5250 struct tty_struct *oldtty = info->port.tty;
5251 u32 speed = info->params.clock_speed;
5252
5253 info->params.clock_speed = 3686400;
5254 info->port.tty = NULL;
5255
5256 /* assume failure */
5257 info->init_error = DiagStatus_DmaFailure;
5258
5259 /* build and send transmit frame */
5260 for (count = 0; count < TESTFRAMESIZE;++count)
5261 buf[count] = (unsigned char)count;
5262
5263 memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5264
5265 /* program hardware for HDLC and enabled receiver */
5266 spin_lock_irqsave(&info->lock,flags);
5267 hdlc_mode(info);
5268 enable_loopback(info,1);
5269 rx_start(info);
5270 info->tx_count = count;
5271 tx_load_dma_buffer(info,buf,count);
5272 tx_start(info);
5273 spin_unlock_irqrestore(&info->lock,flags);
5274
5275 /* wait for receive complete */
5276 /* Set a timeout for waiting for interrupt. */
5277 for ( timeout = 100; timeout; --timeout ) {
5278 msleep_interruptible(10);
5279
5280 if (rx_get_frame(info)) {
5281 rc = true;
5282 break;
5283 }
5284 }
5285
5286 /* verify received frame length and contents */
5287 if (rc &&
5288 ( info->tmp_rx_buf_count != count ||
5289 memcmp(buf, info->tmp_rx_buf,count))) {
5290 rc = false;
5291 }
5292
5293 spin_lock_irqsave(&info->lock,flags);
5294 reset_adapter(info);
5295 spin_unlock_irqrestore(&info->lock,flags);
5296
5297 info->params.clock_speed = speed;
5298 info->port.tty = oldtty;
5299
5300 return rc;
5301 }
5302
5303 /* Perform diagnostics on hardware
5304 */
adapter_test(SLMP_INFO * info)5305 static int adapter_test( SLMP_INFO *info )
5306 {
5307 unsigned long flags;
5308 if ( debug_level >= DEBUG_LEVEL_INFO )
5309 printk( "%s(%d):Testing device %s\n",
5310 __FILE__,__LINE__,info->device_name );
5311
5312 spin_lock_irqsave(&info->lock,flags);
5313 init_adapter(info);
5314 spin_unlock_irqrestore(&info->lock,flags);
5315
5316 info->port_array[0]->port_count = 0;
5317
5318 if ( register_test(info->port_array[0]) &&
5319 register_test(info->port_array[1])) {
5320
5321 info->port_array[0]->port_count = 2;
5322
5323 if ( register_test(info->port_array[2]) &&
5324 register_test(info->port_array[3]) )
5325 info->port_array[0]->port_count += 2;
5326 }
5327 else {
5328 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5329 __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5330 return -ENODEV;
5331 }
5332
5333 if ( !irq_test(info->port_array[0]) ||
5334 !irq_test(info->port_array[1]) ||
5335 (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5336 (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5337 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5338 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5339 return -ENODEV;
5340 }
5341
5342 if (!loopback_test(info->port_array[0]) ||
5343 !loopback_test(info->port_array[1]) ||
5344 (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5345 (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5346 printk( "%s(%d):DMA test failure for device %s\n",
5347 __FILE__,__LINE__,info->device_name);
5348 return -ENODEV;
5349 }
5350
5351 if ( debug_level >= DEBUG_LEVEL_INFO )
5352 printk( "%s(%d):device %s passed diagnostics\n",
5353 __FILE__,__LINE__,info->device_name );
5354
5355 info->port_array[0]->init_error = 0;
5356 info->port_array[1]->init_error = 0;
5357 if ( info->port_count > 2 ) {
5358 info->port_array[2]->init_error = 0;
5359 info->port_array[3]->init_error = 0;
5360 }
5361
5362 return 0;
5363 }
5364
5365 /* Test the shared memory on a PCI adapter.
5366 */
memory_test(SLMP_INFO * info)5367 static bool memory_test(SLMP_INFO *info)
5368 {
5369 static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5370 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5371 unsigned long count = ARRAY_SIZE(testval);
5372 unsigned long i;
5373 unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5374 unsigned long * addr = (unsigned long *)info->memory_base;
5375
5376 /* Test data lines with test pattern at one location. */
5377
5378 for ( i = 0 ; i < count ; i++ ) {
5379 *addr = testval[i];
5380 if ( *addr != testval[i] )
5381 return false;
5382 }
5383
5384 /* Test address lines with incrementing pattern over */
5385 /* entire address range. */
5386
5387 for ( i = 0 ; i < limit ; i++ ) {
5388 *addr = i * 4;
5389 addr++;
5390 }
5391
5392 addr = (unsigned long *)info->memory_base;
5393
5394 for ( i = 0 ; i < limit ; i++ ) {
5395 if ( *addr != i * 4 )
5396 return false;
5397 addr++;
5398 }
5399
5400 memset( info->memory_base, 0, SCA_MEM_SIZE );
5401 return true;
5402 }
5403
5404 /* Load data into PCI adapter shared memory.
5405 *
5406 * The PCI9050 releases control of the local bus
5407 * after completing the current read or write operation.
5408 *
5409 * While the PCI9050 write FIFO not empty, the
5410 * PCI9050 treats all of the writes as a single transaction
5411 * and does not release the bus. This causes DMA latency problems
5412 * at high speeds when copying large data blocks to the shared memory.
5413 *
5414 * This function breaks a write into multiple transations by
5415 * interleaving a read which flushes the write FIFO and 'completes'
5416 * the write transation. This allows any pending DMA request to gain control
5417 * of the local bus in a timely fasion.
5418 */
load_pci_memory(SLMP_INFO * info,char * dest,const char * src,unsigned short count)5419 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5420 {
5421 /* A load interval of 16 allows for 4 32-bit writes at */
5422 /* 136ns each for a maximum latency of 542ns on the local bus.*/
5423
5424 unsigned short interval = count / sca_pci_load_interval;
5425 unsigned short i;
5426
5427 for ( i = 0 ; i < interval ; i++ )
5428 {
5429 memcpy(dest, src, sca_pci_load_interval);
5430 read_status_reg(info);
5431 dest += sca_pci_load_interval;
5432 src += sca_pci_load_interval;
5433 }
5434
5435 memcpy(dest, src, count % sca_pci_load_interval);
5436 }
5437
trace_block(SLMP_INFO * info,const char * data,int count,int xmit)5438 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5439 {
5440 int i;
5441 int linecount;
5442 if (xmit)
5443 printk("%s tx data:\n",info->device_name);
5444 else
5445 printk("%s rx data:\n",info->device_name);
5446
5447 while(count) {
5448 if (count > 16)
5449 linecount = 16;
5450 else
5451 linecount = count;
5452
5453 for(i=0;i<linecount;i++)
5454 printk("%02X ",(unsigned char)data[i]);
5455 for(;i<17;i++)
5456 printk(" ");
5457 for(i=0;i<linecount;i++) {
5458 if (data[i]>=040 && data[i]<=0176)
5459 printk("%c",data[i]);
5460 else
5461 printk(".");
5462 }
5463 printk("\n");
5464
5465 data += linecount;
5466 count -= linecount;
5467 }
5468 } /* end of trace_block() */
5469
5470 /* called when HDLC frame times out
5471 * update stats and do tx completion processing
5472 */
tx_timeout(unsigned long context)5473 static void tx_timeout(unsigned long context)
5474 {
5475 SLMP_INFO *info = (SLMP_INFO*)context;
5476 unsigned long flags;
5477
5478 if ( debug_level >= DEBUG_LEVEL_INFO )
5479 printk( "%s(%d):%s tx_timeout()\n",
5480 __FILE__,__LINE__,info->device_name);
5481 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5482 info->icount.txtimeout++;
5483 }
5484 spin_lock_irqsave(&info->lock,flags);
5485 info->tx_active = false;
5486 info->tx_count = info->tx_put = info->tx_get = 0;
5487
5488 spin_unlock_irqrestore(&info->lock,flags);
5489
5490 #if SYNCLINK_GENERIC_HDLC
5491 if (info->netcount)
5492 hdlcdev_tx_done(info);
5493 else
5494 #endif
5495 bh_transmit(info);
5496 }
5497
5498 /* called to periodically check the DSR/RI modem signal input status
5499 */
status_timeout(unsigned long context)5500 static void status_timeout(unsigned long context)
5501 {
5502 u16 status = 0;
5503 SLMP_INFO *info = (SLMP_INFO*)context;
5504 unsigned long flags;
5505 unsigned char delta;
5506
5507
5508 spin_lock_irqsave(&info->lock,flags);
5509 get_signals(info);
5510 spin_unlock_irqrestore(&info->lock,flags);
5511
5512 /* check for DSR/RI state change */
5513
5514 delta = info->old_signals ^ info->serial_signals;
5515 info->old_signals = info->serial_signals;
5516
5517 if (delta & SerialSignal_DSR)
5518 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5519
5520 if (delta & SerialSignal_RI)
5521 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5522
5523 if (delta & SerialSignal_DCD)
5524 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5525
5526 if (delta & SerialSignal_CTS)
5527 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5528
5529 if (status)
5530 isr_io_pin(info,status);
5531
5532 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5533 }
5534
5535
5536 /* Register Access Routines -
5537 * All registers are memory mapped
5538 */
5539 #define CALC_REGADDR() \
5540 unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5541 if (info->port_num > 1) \
5542 RegAddr += 256; /* port 0-1 SCA0, 2-3 SCA1 */ \
5543 if ( info->port_num & 1) { \
5544 if (Addr > 0x7f) \
5545 RegAddr += 0x40; /* DMA access */ \
5546 else if (Addr > 0x1f && Addr < 0x60) \
5547 RegAddr += 0x20; /* MSCI access */ \
5548 }
5549
5550
read_reg(SLMP_INFO * info,unsigned char Addr)5551 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5552 {
5553 CALC_REGADDR();
5554 return *RegAddr;
5555 }
write_reg(SLMP_INFO * info,unsigned char Addr,unsigned char Value)5556 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5557 {
5558 CALC_REGADDR();
5559 *RegAddr = Value;
5560 }
5561
read_reg16(SLMP_INFO * info,unsigned char Addr)5562 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5563 {
5564 CALC_REGADDR();
5565 return *((u16 *)RegAddr);
5566 }
5567
write_reg16(SLMP_INFO * info,unsigned char Addr,u16 Value)5568 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5569 {
5570 CALC_REGADDR();
5571 *((u16 *)RegAddr) = Value;
5572 }
5573
read_status_reg(SLMP_INFO * info)5574 static unsigned char read_status_reg(SLMP_INFO * info)
5575 {
5576 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5577 return *RegAddr;
5578 }
5579
write_control_reg(SLMP_INFO * info)5580 static void write_control_reg(SLMP_INFO * info)
5581 {
5582 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5583 *RegAddr = info->port_array[0]->ctrlreg_value;
5584 }
5585
5586
synclinkmp_init_one(struct pci_dev * dev,const struct pci_device_id * ent)5587 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5588 const struct pci_device_id *ent)
5589 {
5590 if (pci_enable_device(dev)) {
5591 printk("error enabling pci device %p\n", dev);
5592 return -EIO;
5593 }
5594 device_init( ++synclinkmp_adapter_count, dev );
5595 return 0;
5596 }
5597
synclinkmp_remove_one(struct pci_dev * dev)5598 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5599 {
5600 }
5601