1 /*
2 * drivers/pcmcia/m32r_pcc.c
3 *
4 * Device driver for the PCMCIA functionality of M32R.
5 *
6 * Copyright (c) 2001, 2002, 2003, 2004
7 * Hiroyuki Kondo, Naoto Sugai, Hayato Fujiwara
8 */
9
10 #include <linux/module.h>
11 #include <linux/moduleparam.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/fcntl.h>
15 #include <linux/string.h>
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/timer.h>
19 #include <linux/ioport.h>
20 #include <linux/delay.h>
21 #include <linux/workqueue.h>
22 #include <linux/interrupt.h>
23 #include <linux/platform_device.h>
24 #include <linux/bitops.h>
25 #include <asm/irq.h>
26 #include <asm/io.h>
27 #include <asm/system.h>
28 #include <asm/addrspace.h>
29
30 #include <pcmcia/ss.h>
31
32 /* XXX: should be moved into asm/irq.h */
33 #define PCC0_IRQ 24
34 #define PCC1_IRQ 25
35
36 #include "m32r_pcc.h"
37
38 #define CHAOS_PCC_DEBUG
39 #ifdef CHAOS_PCC_DEBUG
40 static volatile u_short dummy_readbuf;
41 #endif
42
43 #define PCC_DEBUG_DBEX
44
45
46 /* Poll status interval -- 0 means default to interrupt */
47 static int poll_interval = 0;
48
49 typedef enum pcc_space { as_none = 0, as_comm, as_attr, as_io } pcc_as_t;
50
51 typedef struct pcc_socket {
52 u_short type, flags;
53 struct pcmcia_socket socket;
54 unsigned int number;
55 unsigned int ioaddr;
56 u_long mapaddr;
57 u_long base; /* PCC register base */
58 u_char cs_irq, intr;
59 pccard_io_map io_map[MAX_IO_WIN];
60 pccard_mem_map mem_map[MAX_WIN];
61 u_char io_win;
62 u_char mem_win;
63 pcc_as_t current_space;
64 u_char last_iodbex;
65 #ifdef CHAOS_PCC_DEBUG
66 u_char last_iosize;
67 #endif
68 #ifdef CONFIG_PROC_FS
69 struct proc_dir_entry *proc;
70 #endif
71 } pcc_socket_t;
72
73 static int pcc_sockets = 0;
74 static pcc_socket_t socket[M32R_MAX_PCC] = {
75 { 0, }, /* ... */
76 };
77
78 /*====================================================================*/
79
80 static unsigned int pcc_get(u_short, unsigned int);
81 static void pcc_set(u_short, unsigned int , unsigned int );
82
83 static DEFINE_SPINLOCK(pcc_lock);
84
pcc_iorw(int sock,unsigned long port,void * buf,size_t size,size_t nmemb,int wr,int flag)85 void pcc_iorw(int sock, unsigned long port, void *buf, size_t size, size_t nmemb, int wr, int flag)
86 {
87 u_long addr;
88 u_long flags;
89 int need_ex;
90 #ifdef PCC_DEBUG_DBEX
91 int _dbex;
92 #endif
93 pcc_socket_t *t = &socket[sock];
94 #ifdef CHAOS_PCC_DEBUG
95 int map_changed = 0;
96 #endif
97
98 /* Need lock ? */
99 spin_lock_irqsave(&pcc_lock, flags);
100
101 /*
102 * Check if need dbex
103 */
104 need_ex = (size > 1 && flag == 0) ? PCMOD_DBEX : 0;
105 #ifdef PCC_DEBUG_DBEX
106 _dbex = need_ex;
107 need_ex = 0;
108 #endif
109
110 /*
111 * calculate access address
112 */
113 addr = t->mapaddr + port - t->ioaddr + KSEG1; /* XXX */
114
115 /*
116 * Check current mapping
117 */
118 if (t->current_space != as_io || t->last_iodbex != need_ex) {
119
120 u_long cbsz;
121
122 /*
123 * Disable first
124 */
125 pcc_set(sock, PCCR, 0);
126
127 /*
128 * Set mode and io address
129 */
130 cbsz = (t->flags & MAP_16BIT) ? 0 : PCMOD_CBSZ;
131 pcc_set(sock, PCMOD, PCMOD_AS_IO | cbsz | need_ex);
132 pcc_set(sock, PCADR, addr & 0x1ff00000);
133
134 /*
135 * Enable and read it
136 */
137 pcc_set(sock, PCCR, 1);
138
139 #ifdef CHAOS_PCC_DEBUG
140 #if 0
141 map_changed = (t->current_space == as_attr && size == 2); /* XXX */
142 #else
143 map_changed = 1;
144 #endif
145 #endif
146 t->current_space = as_io;
147 }
148
149 /*
150 * access to IO space
151 */
152 if (size == 1) {
153 /* Byte */
154 unsigned char *bp = (unsigned char *)buf;
155
156 #ifdef CHAOS_DEBUG
157 if (map_changed) {
158 dummy_readbuf = readb(addr);
159 }
160 #endif
161 if (wr) {
162 /* write Byte */
163 while (nmemb--) {
164 writeb(*bp++, addr);
165 }
166 } else {
167 /* read Byte */
168 while (nmemb--) {
169 *bp++ = readb(addr);
170 }
171 }
172 } else {
173 /* Word */
174 unsigned short *bp = (unsigned short *)buf;
175
176 #ifdef CHAOS_PCC_DEBUG
177 if (map_changed) {
178 dummy_readbuf = readw(addr);
179 }
180 #endif
181 if (wr) {
182 /* write Word */
183 while (nmemb--) {
184 #ifdef PCC_DEBUG_DBEX
185 if (_dbex) {
186 unsigned char *cp = (unsigned char *)bp;
187 unsigned short tmp;
188 tmp = cp[1] << 8 | cp[0];
189 writew(tmp, addr);
190 bp++;
191 } else
192 #endif
193 writew(*bp++, addr);
194 }
195 } else {
196 /* read Word */
197 while (nmemb--) {
198 #ifdef PCC_DEBUG_DBEX
199 if (_dbex) {
200 unsigned char *cp = (unsigned char *)bp;
201 unsigned short tmp;
202 tmp = readw(addr);
203 cp[0] = tmp & 0xff;
204 cp[1] = (tmp >> 8) & 0xff;
205 bp++;
206 } else
207 #endif
208 *bp++ = readw(addr);
209 }
210 }
211 }
212
213 #if 1
214 /* addr is no longer used */
215 if ((addr = pcc_get(sock, PCIRC)) & PCIRC_BWERR) {
216 printk("m32r_pcc: BWERR detected : port 0x%04lx : iosize %dbit\n",
217 port, size * 8);
218 pcc_set(sock, PCIRC, addr);
219 }
220 #endif
221 /*
222 * save state
223 */
224 t->last_iosize = size;
225 t->last_iodbex = need_ex;
226
227 /* Need lock ? */
228
229 spin_unlock_irqrestore(&pcc_lock,flags);
230
231 return;
232 }
233
pcc_ioread(int sock,unsigned long port,void * buf,size_t size,size_t nmemb,int flag)234 void pcc_ioread(int sock, unsigned long port, void *buf, size_t size, size_t nmemb, int flag) {
235 pcc_iorw(sock, port, buf, size, nmemb, 0, flag);
236 }
237
pcc_iowrite(int sock,unsigned long port,void * buf,size_t size,size_t nmemb,int flag)238 void pcc_iowrite(int sock, unsigned long port, void *buf, size_t size, size_t nmemb, int flag) {
239 pcc_iorw(sock, port, buf, size, nmemb, 1, flag);
240 }
241
242 /*====================================================================*/
243
244 #define IS_REGISTERED 0x2000
245 #define IS_ALIVE 0x8000
246
247 typedef struct pcc_t {
248 char *name;
249 u_short flags;
250 } pcc_t;
251
252 static pcc_t pcc[] = {
253 { "xnux2", 0 }, { "xnux2", 0 },
254 };
255
256 static irqreturn_t pcc_interrupt(int, void *);
257
258 /*====================================================================*/
259
260 static struct timer_list poll_timer;
261
pcc_get(u_short sock,unsigned int reg)262 static unsigned int pcc_get(u_short sock, unsigned int reg)
263 {
264 return inl(socket[sock].base + reg);
265 }
266
267
pcc_set(u_short sock,unsigned int reg,unsigned int data)268 static void pcc_set(u_short sock, unsigned int reg, unsigned int data)
269 {
270 outl(data, socket[sock].base + reg);
271 }
272
273 /*======================================================================
274
275 See if a card is present, powered up, in IO mode, and already
276 bound to a (non PC Card) Linux driver. We leave these alone.
277
278 We make an exception for cards that seem to be serial devices.
279
280 ======================================================================*/
281
is_alive(u_short sock)282 static int __init is_alive(u_short sock)
283 {
284 unsigned int stat;
285 unsigned int f;
286
287 stat = pcc_get(sock, PCIRC);
288 f = (stat & (PCIRC_CDIN1 | PCIRC_CDIN2)) >> 16;
289 if(!f){
290 printk("m32r_pcc: No Card is detected at socket %d : stat = 0x%08x\n",stat,sock);
291 return 0;
292 }
293 if(f!=3)
294 printk("m32r_pcc: Insertion fail (%.8x) at socket %d\n",stat,sock);
295 else
296 printk("m32r_pcc: Card is Inserted at socket %d(%.8x)\n",sock,stat);
297 return 0;
298 }
299
add_pcc_socket(ulong base,int irq,ulong mapaddr,unsigned int ioaddr)300 static void add_pcc_socket(ulong base, int irq, ulong mapaddr,
301 unsigned int ioaddr)
302 {
303 pcc_socket_t *t = &socket[pcc_sockets];
304
305 /* add sockets */
306 t->ioaddr = ioaddr;
307 t->mapaddr = mapaddr;
308 t->base = base;
309 #ifdef CHAOS_PCC_DEBUG
310 t->flags = MAP_16BIT;
311 #else
312 t->flags = 0;
313 #endif
314 if (is_alive(pcc_sockets))
315 t->flags |= IS_ALIVE;
316
317 /* add pcc */
318 if (t->base > 0) {
319 request_region(t->base, 0x20, "m32r-pcc");
320 }
321
322 printk(KERN_INFO " %s ", pcc[pcc_sockets].name);
323 printk("pcc at 0x%08lx\n", t->base);
324
325 /* Update socket interrupt information, capabilities */
326 t->socket.features |= (SS_CAP_PCCARD | SS_CAP_STATIC_MAP);
327 t->socket.map_size = M32R_PCC_MAPSIZE;
328 t->socket.io_offset = ioaddr; /* use for io access offset */
329 t->socket.irq_mask = 0;
330 t->socket.pci_irq = 2 + pcc_sockets; /* XXX */
331
332 request_irq(irq, pcc_interrupt, 0, "m32r-pcc", pcc_interrupt);
333
334 pcc_sockets++;
335
336 return;
337 }
338
339
340 /*====================================================================*/
341
pcc_interrupt(int irq,void * dev)342 static irqreturn_t pcc_interrupt(int irq, void *dev)
343 {
344 int i, j, irc;
345 u_int events, active;
346 int handled = 0;
347
348 pr_debug("m32r_pcc: pcc_interrupt(%d)\n", irq);
349
350 for (j = 0; j < 20; j++) {
351 active = 0;
352 for (i = 0; i < pcc_sockets; i++) {
353 if ((socket[i].cs_irq != irq) &&
354 (socket[i].socket.pci_irq != irq))
355 continue;
356 handled = 1;
357 irc = pcc_get(i, PCIRC);
358 irc >>=16;
359 pr_debug("m32r_pcc: interrupt: socket %d pcirc 0x%02x ",
360 i, irc);
361 if (!irc)
362 continue;
363
364 events = (irc) ? SS_DETECT : 0;
365 events |= (pcc_get(i,PCCR) & PCCR_PCEN) ? SS_READY : 0;
366 pr_debug("m32r_pcc: event 0x%02x\n", events);
367
368 if (events)
369 pcmcia_parse_events(&socket[i].socket, events);
370
371 active |= events;
372 active = 0;
373 }
374 if (!active) break;
375 }
376 if (j == 20)
377 printk(KERN_NOTICE "m32r-pcc: infinite loop in interrupt handler\n");
378
379 pr_debug("m32r_pcc: interrupt done\n");
380
381 return IRQ_RETVAL(handled);
382 } /* pcc_interrupt */
383
pcc_interrupt_wrapper(u_long data)384 static void pcc_interrupt_wrapper(u_long data)
385 {
386 pcc_interrupt(0, NULL);
387 init_timer(&poll_timer);
388 poll_timer.expires = jiffies + poll_interval;
389 add_timer(&poll_timer);
390 }
391
392 /*====================================================================*/
393
_pcc_get_status(u_short sock,u_int * value)394 static int _pcc_get_status(u_short sock, u_int *value)
395 {
396 u_int status;
397
398 status = pcc_get(sock,PCIRC);
399 *value = ((status & PCIRC_CDIN1) && (status & PCIRC_CDIN2))
400 ? SS_DETECT : 0;
401
402 status = pcc_get(sock,PCCR);
403
404 #if 0
405 *value |= (status & PCCR_PCEN) ? SS_READY : 0;
406 #else
407 *value |= SS_READY; /* XXX: always */
408 #endif
409
410 status = pcc_get(sock,PCCSIGCR);
411 *value |= (status & PCCSIGCR_VEN) ? SS_POWERON : 0;
412
413 pr_debug("m32r_pcc: GetStatus(%d) = %#4.4x\n", sock, *value);
414 return 0;
415 } /* _get_status */
416
417 /*====================================================================*/
418
_pcc_set_socket(u_short sock,socket_state_t * state)419 static int _pcc_set_socket(u_short sock, socket_state_t *state)
420 {
421 u_long reg = 0;
422
423 pr_debug("m32r_pcc: SetSocket(%d, flags %#3.3x, Vcc %d, Vpp %d, "
424 "io_irq %d, csc_mask %#2.2x)", sock, state->flags,
425 state->Vcc, state->Vpp, state->io_irq, state->csc_mask);
426
427 if (state->Vcc) {
428 /*
429 * 5V only
430 */
431 if (state->Vcc == 50) {
432 reg |= PCCSIGCR_VEN;
433 } else {
434 return -EINVAL;
435 }
436 }
437
438 if (state->flags & SS_RESET) {
439 pr_debug("m32r_pcc: :RESET\n");
440 reg |= PCCSIGCR_CRST;
441 }
442 if (state->flags & SS_OUTPUT_ENA){
443 pr_debug("m32r_pcc: :OUTPUT_ENA\n");
444 /* bit clear */
445 } else {
446 reg |= PCCSIGCR_SEN;
447 }
448
449 pcc_set(sock,PCCSIGCR,reg);
450
451 if(state->flags & SS_IOCARD){
452 pr_debug("m32r_pcc: :IOCARD");
453 }
454 if (state->flags & SS_PWR_AUTO) {
455 pr_debug("m32r_pcc: :PWR_AUTO");
456 }
457 if (state->csc_mask & SS_DETECT)
458 pr_debug("m32r_pcc: :csc-SS_DETECT");
459 if (state->flags & SS_IOCARD) {
460 if (state->csc_mask & SS_STSCHG)
461 pr_debug("m32r_pcc: :STSCHG");
462 } else {
463 if (state->csc_mask & SS_BATDEAD)
464 pr_debug("m32r_pcc: :BATDEAD");
465 if (state->csc_mask & SS_BATWARN)
466 pr_debug("m32r_pcc: :BATWARN");
467 if (state->csc_mask & SS_READY)
468 pr_debug("m32r_pcc: :READY");
469 }
470 pr_debug("m32r_pcc: \n");
471 return 0;
472 } /* _set_socket */
473
474 /*====================================================================*/
475
_pcc_set_io_map(u_short sock,struct pccard_io_map * io)476 static int _pcc_set_io_map(u_short sock, struct pccard_io_map *io)
477 {
478 u_char map;
479
480 pr_debug("m32r_pcc: SetIOMap(%d, %d, %#2.2x, %d ns, "
481 "%#llx-%#llx)\n", sock, io->map, io->flags,
482 io->speed, (unsigned long long)io->start,
483 (unsigned long long)io->stop);
484 map = io->map;
485
486 return 0;
487 } /* _set_io_map */
488
489 /*====================================================================*/
490
_pcc_set_mem_map(u_short sock,struct pccard_mem_map * mem)491 static int _pcc_set_mem_map(u_short sock, struct pccard_mem_map *mem)
492 {
493
494 u_char map = mem->map;
495 u_long mode;
496 u_long addr;
497 pcc_socket_t *t = &socket[sock];
498 #ifdef CHAOS_PCC_DEBUG
499 #if 0
500 pcc_as_t last = t->current_space;
501 #endif
502 #endif
503
504 pr_debug("m32r_pcc: SetMemMap(%d, %d, %#2.2x, %d ns, "
505 "%#llx, %#x)\n", sock, map, mem->flags,
506 mem->speed, (unsigned long long)mem->static_start,
507 mem->card_start);
508
509 /*
510 * sanity check
511 */
512 if ((map > MAX_WIN) || (mem->card_start > 0x3ffffff)){
513 return -EINVAL;
514 }
515
516 /*
517 * de-activate
518 */
519 if ((mem->flags & MAP_ACTIVE) == 0) {
520 t->current_space = as_none;
521 return 0;
522 }
523
524 /*
525 * Disable first
526 */
527 pcc_set(sock, PCCR, 0);
528
529 /*
530 * Set mode
531 */
532 if (mem->flags & MAP_ATTRIB) {
533 mode = PCMOD_AS_ATTRIB | PCMOD_CBSZ;
534 t->current_space = as_attr;
535 } else {
536 mode = 0; /* common memory */
537 t->current_space = as_comm;
538 }
539 pcc_set(sock, PCMOD, mode);
540
541 /*
542 * Set address
543 */
544 addr = t->mapaddr + (mem->card_start & M32R_PCC_MAPMASK);
545 pcc_set(sock, PCADR, addr);
546
547 mem->static_start = addr + mem->card_start;
548
549 /*
550 * Enable again
551 */
552 pcc_set(sock, PCCR, 1);
553
554 #ifdef CHAOS_PCC_DEBUG
555 #if 0
556 if (last != as_attr) {
557 #else
558 if (1) {
559 #endif
560 dummy_readbuf = *(u_char *)(addr + KSEG1);
561 }
562 #endif
563
564 return 0;
565
566 } /* _set_mem_map */
567
568 #if 0 /* driver model ordering issue */
569 /*======================================================================
570
571 Routines for accessing socket information and register dumps via
572 /proc/bus/pccard/...
573
574 ======================================================================*/
575
576 static ssize_t show_info(struct class_device *class_dev, char *buf)
577 {
578 pcc_socket_t *s = container_of(class_dev, struct pcc_socket,
579 socket.dev);
580
581 return sprintf(buf, "type: %s\nbase addr: 0x%08lx\n",
582 pcc[s->type].name, s->base);
583 }
584
585 static ssize_t show_exca(struct class_device *class_dev, char *buf)
586 {
587 /* FIXME */
588
589 return 0;
590 }
591
592 static CLASS_DEVICE_ATTR(info, S_IRUGO, show_info, NULL);
593 static CLASS_DEVICE_ATTR(exca, S_IRUGO, show_exca, NULL);
594 #endif
595
596 /*====================================================================*/
597
598 /* this is horribly ugly... proper locking needs to be done here at
599 * some time... */
600 #define LOCKED(x) do { \
601 int retval; \
602 unsigned long flags; \
603 spin_lock_irqsave(&pcc_lock, flags); \
604 retval = x; \
605 spin_unlock_irqrestore(&pcc_lock, flags); \
606 return retval; \
607 } while (0)
608
609
610 static int pcc_get_status(struct pcmcia_socket *s, u_int *value)
611 {
612 unsigned int sock = container_of(s, struct pcc_socket, socket)->number;
613
614 if (socket[sock].flags & IS_ALIVE) {
615 *value = 0;
616 return -EINVAL;
617 }
618 LOCKED(_pcc_get_status(sock, value));
619 }
620
621 static int pcc_set_socket(struct pcmcia_socket *s, socket_state_t *state)
622 {
623 unsigned int sock = container_of(s, struct pcc_socket, socket)->number;
624
625 if (socket[sock].flags & IS_ALIVE)
626 return -EINVAL;
627
628 LOCKED(_pcc_set_socket(sock, state));
629 }
630
631 static int pcc_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
632 {
633 unsigned int sock = container_of(s, struct pcc_socket, socket)->number;
634
635 if (socket[sock].flags & IS_ALIVE)
636 return -EINVAL;
637 LOCKED(_pcc_set_io_map(sock, io));
638 }
639
640 static int pcc_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *mem)
641 {
642 unsigned int sock = container_of(s, struct pcc_socket, socket)->number;
643
644 if (socket[sock].flags & IS_ALIVE)
645 return -EINVAL;
646 LOCKED(_pcc_set_mem_map(sock, mem));
647 }
648
649 static int pcc_init(struct pcmcia_socket *s)
650 {
651 pr_debug("m32r_pcc: init call\n");
652 return 0;
653 }
654
655 static struct pccard_operations pcc_operations = {
656 .init = pcc_init,
657 .get_status = pcc_get_status,
658 .set_socket = pcc_set_socket,
659 .set_io_map = pcc_set_io_map,
660 .set_mem_map = pcc_set_mem_map,
661 };
662
663 /*====================================================================*/
664
665 static struct platform_driver pcc_driver = {
666 .driver = {
667 .name = "pcc",
668 .owner = THIS_MODULE,
669 },
670 };
671
672 static struct platform_device pcc_device = {
673 .name = "pcc",
674 .id = 0,
675 };
676
677 /*====================================================================*/
678
679 static int __init init_m32r_pcc(void)
680 {
681 int i, ret;
682
683 ret = platform_driver_register(&pcc_driver);
684 if (ret)
685 return ret;
686
687 ret = platform_device_register(&pcc_device);
688 if (ret){
689 platform_driver_unregister(&pcc_driver);
690 return ret;
691 }
692
693 printk(KERN_INFO "m32r PCC probe:\n");
694
695 pcc_sockets = 0;
696
697 add_pcc_socket(M32R_PCC0_BASE, PCC0_IRQ, M32R_PCC0_MAPBASE, 0x1000);
698
699 #ifdef CONFIG_M32RPCC_SLOT2
700 add_pcc_socket(M32R_PCC1_BASE, PCC1_IRQ, M32R_PCC1_MAPBASE, 0x2000);
701 #endif
702
703 if (pcc_sockets == 0) {
704 printk("socket is not found.\n");
705 platform_device_unregister(&pcc_device);
706 platform_driver_unregister(&pcc_driver);
707 return -ENODEV;
708 }
709
710 /* Set up interrupt handler(s) */
711
712 for (i = 0 ; i < pcc_sockets ; i++) {
713 socket[i].socket.dev.parent = &pcc_device.dev;
714 socket[i].socket.ops = &pcc_operations;
715 socket[i].socket.resource_ops = &pccard_static_ops;
716 socket[i].socket.owner = THIS_MODULE;
717 socket[i].number = i;
718 ret = pcmcia_register_socket(&socket[i].socket);
719 if (!ret)
720 socket[i].flags |= IS_REGISTERED;
721
722 #if 0 /* driver model ordering issue */
723 class_device_create_file(&socket[i].socket.dev,
724 &class_device_attr_info);
725 class_device_create_file(&socket[i].socket.dev,
726 &class_device_attr_exca);
727 #endif
728 }
729
730 /* Finally, schedule a polling interrupt */
731 if (poll_interval != 0) {
732 poll_timer.function = pcc_interrupt_wrapper;
733 poll_timer.data = 0;
734 init_timer(&poll_timer);
735 poll_timer.expires = jiffies + poll_interval;
736 add_timer(&poll_timer);
737 }
738
739 return 0;
740 } /* init_m32r_pcc */
741
742 static void __exit exit_m32r_pcc(void)
743 {
744 int i;
745
746 for (i = 0; i < pcc_sockets; i++)
747 if (socket[i].flags & IS_REGISTERED)
748 pcmcia_unregister_socket(&socket[i].socket);
749
750 platform_device_unregister(&pcc_device);
751 if (poll_interval != 0)
752 del_timer_sync(&poll_timer);
753
754 platform_driver_unregister(&pcc_driver);
755 } /* exit_m32r_pcc */
756
757 module_init(init_m32r_pcc);
758 module_exit(exit_m32r_pcc);
759 MODULE_LICENSE("Dual MPL/GPL");
760 /*====================================================================*/
761