1 /*
2 * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
3 *
4 * Copyright (C) 2004 Texas Instruments
5 * Copyright (C) 2004 David Brownell
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 #include <linux/gpio.h>
29 #include <linux/usb/ch9.h>
30 #include <linux/usb/gadget.h>
31 #include <linux/usb.h>
32 #include <linux/usb/otg.h>
33 #include <linux/i2c.h>
34 #include <linux/workqueue.h>
35
36 #include <asm/irq.h>
37 #include <asm/mach-types.h>
38
39 #include <plat/usb.h>
40 #include <plat/mux.h>
41
42
43 #ifndef DEBUG
44 #undef VERBOSE
45 #endif
46
47
48 #define DRIVER_VERSION "24 August 2004"
49 #define DRIVER_NAME (isp1301_driver.driver.name)
50
51 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
52 MODULE_LICENSE("GPL");
53
54 struct isp1301 {
55 struct otg_transceiver otg;
56 struct i2c_client *client;
57 void (*i2c_release)(struct device *dev);
58
59 int irq_type;
60
61 u32 last_otg_ctrl;
62 unsigned working:1;
63
64 struct timer_list timer;
65
66 /* use keventd context to change the state for us */
67 struct work_struct work;
68
69 unsigned long todo;
70 # define WORK_UPDATE_ISP 0 /* update ISP from OTG */
71 # define WORK_UPDATE_OTG 1 /* update OTG from ISP */
72 # define WORK_HOST_RESUME 4 /* resume host */
73 # define WORK_TIMER 6 /* timer fired */
74 # define WORK_STOP 7 /* don't resubmit */
75 };
76
77
78 /* bits in OTG_CTRL */
79
80 #define OTG_XCEIV_OUTPUTS \
81 (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
82 #define OTG_XCEIV_INPUTS \
83 (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
84 #define OTG_CTRL_BITS \
85 (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
86 /* and OTG_PULLUP is sometimes written */
87
88 #define OTG_CTRL_MASK (OTG_DRIVER_SEL| \
89 OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
90 OTG_CTRL_BITS)
91
92
93 /*-------------------------------------------------------------------------*/
94
95 /* board-specific PM hooks */
96
97 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
98
99 #if defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
100
101 #include <linux/i2c/tps65010.h>
102
103 #else
104
tps65010_set_vbus_draw(unsigned mA)105 static inline int tps65010_set_vbus_draw(unsigned mA)
106 {
107 pr_debug("tps65010: draw %d mA (STUB)\n", mA);
108 return 0;
109 }
110
111 #endif
112
enable_vbus_draw(struct isp1301 * isp,unsigned mA)113 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
114 {
115 int status = tps65010_set_vbus_draw(mA);
116 if (status < 0)
117 pr_debug(" VBUS %d mA error %d\n", mA, status);
118 }
119
120 #else
121
enable_vbus_draw(struct isp1301 * isp,unsigned mA)122 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
123 {
124 /* H4 controls this by DIP switch S2.4; no soft control.
125 * ON means the charger is always enabled. Leave it OFF
126 * unless the OTG port is used only in B-peripheral mode.
127 */
128 }
129
130 #endif
131
enable_vbus_source(struct isp1301 * isp)132 static void enable_vbus_source(struct isp1301 *isp)
133 {
134 /* this board won't supply more than 8mA vbus power.
135 * some boards can switch a 100ma "unit load" (or more).
136 */
137 }
138
139
140 /* products will deliver OTG messages with LEDs, GUI, etc */
notresponding(struct isp1301 * isp)141 static inline void notresponding(struct isp1301 *isp)
142 {
143 printk(KERN_NOTICE "OTG device not responding.\n");
144 }
145
146
147 /*-------------------------------------------------------------------------*/
148
149 static struct i2c_driver isp1301_driver;
150
151 /* smbus apis are used for portability */
152
153 static inline u8
isp1301_get_u8(struct isp1301 * isp,u8 reg)154 isp1301_get_u8(struct isp1301 *isp, u8 reg)
155 {
156 return i2c_smbus_read_byte_data(isp->client, reg + 0);
157 }
158
159 static inline int
isp1301_get_u16(struct isp1301 * isp,u8 reg)160 isp1301_get_u16(struct isp1301 *isp, u8 reg)
161 {
162 return i2c_smbus_read_word_data(isp->client, reg);
163 }
164
165 static inline int
isp1301_set_bits(struct isp1301 * isp,u8 reg,u8 bits)166 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
167 {
168 return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
169 }
170
171 static inline int
isp1301_clear_bits(struct isp1301 * isp,u8 reg,u8 bits)172 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
173 {
174 return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
175 }
176
177 /*-------------------------------------------------------------------------*/
178
179 /* identification */
180 #define ISP1301_VENDOR_ID 0x00 /* u16 read */
181 #define ISP1301_PRODUCT_ID 0x02 /* u16 read */
182 #define ISP1301_BCD_DEVICE 0x14 /* u16 read */
183
184 #define I2C_VENDOR_ID_PHILIPS 0x04cc
185 #define I2C_PRODUCT_ID_PHILIPS_1301 0x1301
186
187 /* operational registers */
188 #define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */
189 # define MC1_SPEED (1 << 0)
190 # define MC1_SUSPEND (1 << 1)
191 # define MC1_DAT_SE0 (1 << 2)
192 # define MC1_TRANSPARENT (1 << 3)
193 # define MC1_BDIS_ACON_EN (1 << 4)
194 # define MC1_OE_INT_EN (1 << 5)
195 # define MC1_UART_EN (1 << 6)
196 # define MC1_MASK 0x7f
197 #define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */
198 # define MC2_GLOBAL_PWR_DN (1 << 0)
199 # define MC2_SPD_SUSP_CTRL (1 << 1)
200 # define MC2_BI_DI (1 << 2)
201 # define MC2_TRANSP_BDIR0 (1 << 3)
202 # define MC2_TRANSP_BDIR1 (1 << 4)
203 # define MC2_AUDIO_EN (1 << 5)
204 # define MC2_PSW_EN (1 << 6)
205 # define MC2_EN2V7 (1 << 7)
206 #define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */
207 # define OTG1_DP_PULLUP (1 << 0)
208 # define OTG1_DM_PULLUP (1 << 1)
209 # define OTG1_DP_PULLDOWN (1 << 2)
210 # define OTG1_DM_PULLDOWN (1 << 3)
211 # define OTG1_ID_PULLDOWN (1 << 4)
212 # define OTG1_VBUS_DRV (1 << 5)
213 # define OTG1_VBUS_DISCHRG (1 << 6)
214 # define OTG1_VBUS_CHRG (1 << 7)
215 #define ISP1301_OTG_STATUS 0x10 /* u8 readonly */
216 # define OTG_B_SESS_END (1 << 6)
217 # define OTG_B_SESS_VLD (1 << 7)
218
219 #define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */
220 #define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */
221
222 #define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */
223 #define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */
224
225 /* same bitfields in all interrupt registers */
226 # define INTR_VBUS_VLD (1 << 0)
227 # define INTR_SESS_VLD (1 << 1)
228 # define INTR_DP_HI (1 << 2)
229 # define INTR_ID_GND (1 << 3)
230 # define INTR_DM_HI (1 << 4)
231 # define INTR_ID_FLOAT (1 << 5)
232 # define INTR_BDIS_ACON (1 << 6)
233 # define INTR_CR_INT (1 << 7)
234
235 /*-------------------------------------------------------------------------*/
236
state_name(struct isp1301 * isp)237 static inline const char *state_name(struct isp1301 *isp)
238 {
239 return otg_state_string(isp->otg.state);
240 }
241
242 /*-------------------------------------------------------------------------*/
243
244 /* NOTE: some of this ISP1301 setup is specific to H2 boards;
245 * not everything is guarded by board-specific checks, or even using
246 * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
247 *
248 * ALSO: this currently doesn't use ISP1301 low-power modes
249 * while OTG is running.
250 */
251
power_down(struct isp1301 * isp)252 static void power_down(struct isp1301 *isp)
253 {
254 isp->otg.state = OTG_STATE_UNDEFINED;
255
256 // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
257 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
258
259 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
260 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
261 }
262
power_up(struct isp1301 * isp)263 static void power_up(struct isp1301 *isp)
264 {
265 // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
266 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
267
268 /* do this only when cpu is driving transceiver,
269 * so host won't see a low speed device...
270 */
271 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
272 }
273
274 #define NO_HOST_SUSPEND
275
host_suspend(struct isp1301 * isp)276 static int host_suspend(struct isp1301 *isp)
277 {
278 #ifdef NO_HOST_SUSPEND
279 return 0;
280 #else
281 struct device *dev;
282
283 if (!isp->otg.host)
284 return -ENODEV;
285
286 /* Currently ASSUMES only the OTG port matters;
287 * other ports could be active...
288 */
289 dev = isp->otg.host->controller;
290 return dev->driver->suspend(dev, 3, 0);
291 #endif
292 }
293
host_resume(struct isp1301 * isp)294 static int host_resume(struct isp1301 *isp)
295 {
296 #ifdef NO_HOST_SUSPEND
297 return 0;
298 #else
299 struct device *dev;
300
301 if (!isp->otg.host)
302 return -ENODEV;
303
304 dev = isp->otg.host->controller;
305 return dev->driver->resume(dev, 0);
306 #endif
307 }
308
gadget_suspend(struct isp1301 * isp)309 static int gadget_suspend(struct isp1301 *isp)
310 {
311 isp->otg.gadget->b_hnp_enable = 0;
312 isp->otg.gadget->a_hnp_support = 0;
313 isp->otg.gadget->a_alt_hnp_support = 0;
314 return usb_gadget_vbus_disconnect(isp->otg.gadget);
315 }
316
317 /*-------------------------------------------------------------------------*/
318
319 #define TIMER_MINUTES 10
320 #define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ)
321
322 /* Almost all our I2C messaging comes from a work queue's task context.
323 * NOTE: guaranteeing certain response times might mean we shouldn't
324 * share keventd's work queue; a realtime task might be safest.
325 */
isp1301_defer_work(struct isp1301 * isp,int work)326 static void isp1301_defer_work(struct isp1301 *isp, int work)
327 {
328 int status;
329
330 if (isp && !test_and_set_bit(work, &isp->todo)) {
331 (void) get_device(&isp->client->dev);
332 status = schedule_work(&isp->work);
333 if (!status && !isp->working)
334 dev_vdbg(&isp->client->dev,
335 "work item %d may be lost\n", work);
336 }
337 }
338
339 /* called from irq handlers */
a_idle(struct isp1301 * isp,const char * tag)340 static void a_idle(struct isp1301 *isp, const char *tag)
341 {
342 u32 l;
343
344 if (isp->otg.state == OTG_STATE_A_IDLE)
345 return;
346
347 isp->otg.default_a = 1;
348 if (isp->otg.host) {
349 isp->otg.host->is_b_host = 0;
350 host_suspend(isp);
351 }
352 if (isp->otg.gadget) {
353 isp->otg.gadget->is_a_peripheral = 1;
354 gadget_suspend(isp);
355 }
356 isp->otg.state = OTG_STATE_A_IDLE;
357 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
358 omap_writel(l, OTG_CTRL);
359 isp->last_otg_ctrl = l;
360 pr_debug(" --> %s/%s\n", state_name(isp), tag);
361 }
362
363 /* called from irq handlers */
b_idle(struct isp1301 * isp,const char * tag)364 static void b_idle(struct isp1301 *isp, const char *tag)
365 {
366 u32 l;
367
368 if (isp->otg.state == OTG_STATE_B_IDLE)
369 return;
370
371 isp->otg.default_a = 0;
372 if (isp->otg.host) {
373 isp->otg.host->is_b_host = 1;
374 host_suspend(isp);
375 }
376 if (isp->otg.gadget) {
377 isp->otg.gadget->is_a_peripheral = 0;
378 gadget_suspend(isp);
379 }
380 isp->otg.state = OTG_STATE_B_IDLE;
381 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
382 omap_writel(l, OTG_CTRL);
383 isp->last_otg_ctrl = l;
384 pr_debug(" --> %s/%s\n", state_name(isp), tag);
385 }
386
387 static void
dump_regs(struct isp1301 * isp,const char * label)388 dump_regs(struct isp1301 *isp, const char *label)
389 {
390 #ifdef DEBUG
391 u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
392 u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
393 u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
394
395 pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
396 omap_readl(OTG_CTRL), label, state_name(isp),
397 ctrl, status, src);
398 /* mode control and irq enables don't change much */
399 #endif
400 }
401
402 /*-------------------------------------------------------------------------*/
403
404 #ifdef CONFIG_USB_OTG
405
406 /*
407 * The OMAP OTG controller handles most of the OTG state transitions.
408 *
409 * We translate isp1301 outputs (mostly voltage comparator status) into
410 * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
411 * flags into isp1301 inputs ... and infer state transitions.
412 */
413
414 #ifdef VERBOSE
415
check_state(struct isp1301 * isp,const char * tag)416 static void check_state(struct isp1301 *isp, const char *tag)
417 {
418 enum usb_otg_state state = OTG_STATE_UNDEFINED;
419 u8 fsm = omap_readw(OTG_TEST) & 0x0ff;
420 unsigned extra = 0;
421
422 switch (fsm) {
423
424 /* default-b */
425 case 0x0:
426 state = OTG_STATE_B_IDLE;
427 break;
428 case 0x3:
429 case 0x7:
430 extra = 1;
431 case 0x1:
432 state = OTG_STATE_B_PERIPHERAL;
433 break;
434 case 0x11:
435 state = OTG_STATE_B_SRP_INIT;
436 break;
437
438 /* extra dual-role default-b states */
439 case 0x12:
440 case 0x13:
441 case 0x16:
442 extra = 1;
443 case 0x17:
444 state = OTG_STATE_B_WAIT_ACON;
445 break;
446 case 0x34:
447 state = OTG_STATE_B_HOST;
448 break;
449
450 /* default-a */
451 case 0x36:
452 state = OTG_STATE_A_IDLE;
453 break;
454 case 0x3c:
455 state = OTG_STATE_A_WAIT_VFALL;
456 break;
457 case 0x7d:
458 state = OTG_STATE_A_VBUS_ERR;
459 break;
460 case 0x9e:
461 case 0x9f:
462 extra = 1;
463 case 0x89:
464 state = OTG_STATE_A_PERIPHERAL;
465 break;
466 case 0xb7:
467 state = OTG_STATE_A_WAIT_VRISE;
468 break;
469 case 0xb8:
470 state = OTG_STATE_A_WAIT_BCON;
471 break;
472 case 0xb9:
473 state = OTG_STATE_A_HOST;
474 break;
475 case 0xba:
476 state = OTG_STATE_A_SUSPEND;
477 break;
478 default:
479 break;
480 }
481 if (isp->otg.state == state && !extra)
482 return;
483 pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
484 otg_state_string(state), fsm, state_name(isp),
485 omap_readl(OTG_CTRL));
486 }
487
488 #else
489
check_state(struct isp1301 * isp,const char * tag)490 static inline void check_state(struct isp1301 *isp, const char *tag) { }
491
492 #endif
493
494 /* outputs from ISP1301_INTERRUPT_SOURCE */
update_otg1(struct isp1301 * isp,u8 int_src)495 static void update_otg1(struct isp1301 *isp, u8 int_src)
496 {
497 u32 otg_ctrl;
498
499 otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
500 otg_ctrl &= ~OTG_XCEIV_INPUTS;
501 otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
502
503 if (int_src & INTR_SESS_VLD)
504 otg_ctrl |= OTG_ASESSVLD;
505 else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
506 a_idle(isp, "vfall");
507 otg_ctrl &= ~OTG_CTRL_BITS;
508 }
509 if (int_src & INTR_VBUS_VLD)
510 otg_ctrl |= OTG_VBUSVLD;
511 if (int_src & INTR_ID_GND) { /* default-A */
512 if (isp->otg.state == OTG_STATE_B_IDLE
513 || isp->otg.state == OTG_STATE_UNDEFINED) {
514 a_idle(isp, "init");
515 return;
516 }
517 } else { /* default-B */
518 otg_ctrl |= OTG_ID;
519 if (isp->otg.state == OTG_STATE_A_IDLE
520 || isp->otg.state == OTG_STATE_UNDEFINED) {
521 b_idle(isp, "init");
522 return;
523 }
524 }
525 omap_writel(otg_ctrl, OTG_CTRL);
526 }
527
528 /* outputs from ISP1301_OTG_STATUS */
update_otg2(struct isp1301 * isp,u8 otg_status)529 static void update_otg2(struct isp1301 *isp, u8 otg_status)
530 {
531 u32 otg_ctrl;
532
533 otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
534 otg_ctrl &= ~OTG_XCEIV_INPUTS;
535 otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
536 if (otg_status & OTG_B_SESS_VLD)
537 otg_ctrl |= OTG_BSESSVLD;
538 else if (otg_status & OTG_B_SESS_END)
539 otg_ctrl |= OTG_BSESSEND;
540 omap_writel(otg_ctrl, OTG_CTRL);
541 }
542
543 /* inputs going to ISP1301 */
otg_update_isp(struct isp1301 * isp)544 static void otg_update_isp(struct isp1301 *isp)
545 {
546 u32 otg_ctrl, otg_change;
547 u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
548
549 otg_ctrl = omap_readl(OTG_CTRL);
550 otg_change = otg_ctrl ^ isp->last_otg_ctrl;
551 isp->last_otg_ctrl = otg_ctrl;
552 otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
553
554 switch (isp->otg.state) {
555 case OTG_STATE_B_IDLE:
556 case OTG_STATE_B_PERIPHERAL:
557 case OTG_STATE_B_SRP_INIT:
558 if (!(otg_ctrl & OTG_PULLUP)) {
559 // if (otg_ctrl & OTG_B_HNPEN) {
560 if (isp->otg.gadget->b_hnp_enable) {
561 isp->otg.state = OTG_STATE_B_WAIT_ACON;
562 pr_debug(" --> b_wait_acon\n");
563 }
564 goto pulldown;
565 }
566 pullup:
567 set |= OTG1_DP_PULLUP;
568 clr |= OTG1_DP_PULLDOWN;
569 break;
570 case OTG_STATE_A_SUSPEND:
571 case OTG_STATE_A_PERIPHERAL:
572 if (otg_ctrl & OTG_PULLUP)
573 goto pullup;
574 /* FALLTHROUGH */
575 // case OTG_STATE_B_WAIT_ACON:
576 default:
577 pulldown:
578 set |= OTG1_DP_PULLDOWN;
579 clr |= OTG1_DP_PULLUP;
580 break;
581 }
582
583 # define toggle(OTG,ISP) do { \
584 if (otg_ctrl & OTG) set |= ISP; \
585 else clr |= ISP; \
586 } while (0)
587
588 if (!(isp->otg.host))
589 otg_ctrl &= ~OTG_DRV_VBUS;
590
591 switch (isp->otg.state) {
592 case OTG_STATE_A_SUSPEND:
593 if (otg_ctrl & OTG_DRV_VBUS) {
594 set |= OTG1_VBUS_DRV;
595 break;
596 }
597 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
598 notresponding(isp);
599
600 /* FALLTHROUGH */
601 case OTG_STATE_A_VBUS_ERR:
602 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
603 pr_debug(" --> a_wait_vfall\n");
604 /* FALLTHROUGH */
605 case OTG_STATE_A_WAIT_VFALL:
606 /* FIXME usbcore thinks port power is still on ... */
607 clr |= OTG1_VBUS_DRV;
608 break;
609 case OTG_STATE_A_IDLE:
610 if (otg_ctrl & OTG_DRV_VBUS) {
611 isp->otg.state = OTG_STATE_A_WAIT_VRISE;
612 pr_debug(" --> a_wait_vrise\n");
613 }
614 /* FALLTHROUGH */
615 default:
616 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
617 }
618
619 toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
620 toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
621
622 # undef toggle
623
624 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
625 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
626
627 /* HNP switch to host or peripheral; and SRP */
628 if (otg_change & OTG_PULLUP) {
629 u32 l;
630
631 switch (isp->otg.state) {
632 case OTG_STATE_B_IDLE:
633 if (clr & OTG1_DP_PULLUP)
634 break;
635 isp->otg.state = OTG_STATE_B_PERIPHERAL;
636 pr_debug(" --> b_peripheral\n");
637 break;
638 case OTG_STATE_A_SUSPEND:
639 if (clr & OTG1_DP_PULLUP)
640 break;
641 isp->otg.state = OTG_STATE_A_PERIPHERAL;
642 pr_debug(" --> a_peripheral\n");
643 break;
644 default:
645 break;
646 }
647 l = omap_readl(OTG_CTRL);
648 l |= OTG_PULLUP;
649 omap_writel(l, OTG_CTRL);
650 }
651
652 check_state(isp, __func__);
653 dump_regs(isp, "otg->isp1301");
654 }
655
omap_otg_irq(int irq,void * _isp)656 static irqreturn_t omap_otg_irq(int irq, void *_isp)
657 {
658 u16 otg_irq = omap_readw(OTG_IRQ_SRC);
659 u32 otg_ctrl;
660 int ret = IRQ_NONE;
661 struct isp1301 *isp = _isp;
662
663 /* update ISP1301 transceiver from OTG controller */
664 if (otg_irq & OPRT_CHG) {
665 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
666 isp1301_defer_work(isp, WORK_UPDATE_ISP);
667 ret = IRQ_HANDLED;
668
669 /* SRP to become b_peripheral failed */
670 } else if (otg_irq & B_SRP_TMROUT) {
671 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
672 notresponding(isp);
673
674 /* gadget drivers that care should monitor all kinds of
675 * remote wakeup (SRP, normal) using their own timer
676 * to give "check cable and A-device" messages.
677 */
678 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
679 b_idle(isp, "srp_timeout");
680
681 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
682 ret = IRQ_HANDLED;
683
684 /* HNP to become b_host failed */
685 } else if (otg_irq & B_HNP_FAIL) {
686 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
687 state_name(isp), omap_readl(OTG_CTRL));
688 notresponding(isp);
689
690 otg_ctrl = omap_readl(OTG_CTRL);
691 otg_ctrl |= OTG_BUSDROP;
692 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
693 omap_writel(otg_ctrl, OTG_CTRL);
694
695 /* subset of b_peripheral()... */
696 isp->otg.state = OTG_STATE_B_PERIPHERAL;
697 pr_debug(" --> b_peripheral\n");
698
699 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
700 ret = IRQ_HANDLED;
701
702 /* detect SRP from B-device ... */
703 } else if (otg_irq & A_SRP_DETECT) {
704 pr_debug("otg: %s SRP_DETECT, %06x\n",
705 state_name(isp), omap_readl(OTG_CTRL));
706
707 isp1301_defer_work(isp, WORK_UPDATE_OTG);
708 switch (isp->otg.state) {
709 case OTG_STATE_A_IDLE:
710 if (!isp->otg.host)
711 break;
712 isp1301_defer_work(isp, WORK_HOST_RESUME);
713 otg_ctrl = omap_readl(OTG_CTRL);
714 otg_ctrl |= OTG_A_BUSREQ;
715 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
716 & ~OTG_XCEIV_INPUTS
717 & OTG_CTRL_MASK;
718 omap_writel(otg_ctrl, OTG_CTRL);
719 break;
720 default:
721 break;
722 }
723
724 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
725 ret = IRQ_HANDLED;
726
727 /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise)
728 * we don't track them separately
729 */
730 } else if (otg_irq & A_REQ_TMROUT) {
731 otg_ctrl = omap_readl(OTG_CTRL);
732 pr_info("otg: BCON_TMOUT from %s, %06x\n",
733 state_name(isp), otg_ctrl);
734 notresponding(isp);
735
736 otg_ctrl |= OTG_BUSDROP;
737 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
738 omap_writel(otg_ctrl, OTG_CTRL);
739 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
740
741 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
742 ret = IRQ_HANDLED;
743
744 /* A-supplied voltage fell too low; overcurrent */
745 } else if (otg_irq & A_VBUS_ERR) {
746 otg_ctrl = omap_readl(OTG_CTRL);
747 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
748 state_name(isp), otg_irq, otg_ctrl);
749
750 otg_ctrl |= OTG_BUSDROP;
751 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
752 omap_writel(otg_ctrl, OTG_CTRL);
753 isp->otg.state = OTG_STATE_A_VBUS_ERR;
754
755 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
756 ret = IRQ_HANDLED;
757
758 /* switch driver; the transceiver code activates it,
759 * ungating the udc clock or resuming OHCI.
760 */
761 } else if (otg_irq & DRIVER_SWITCH) {
762 int kick = 0;
763
764 otg_ctrl = omap_readl(OTG_CTRL);
765 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
766 state_name(isp),
767 (otg_ctrl & OTG_DRIVER_SEL)
768 ? "gadget" : "host",
769 otg_ctrl);
770 isp1301_defer_work(isp, WORK_UPDATE_ISP);
771
772 /* role is peripheral */
773 if (otg_ctrl & OTG_DRIVER_SEL) {
774 switch (isp->otg.state) {
775 case OTG_STATE_A_IDLE:
776 b_idle(isp, __func__);
777 break;
778 default:
779 break;
780 }
781 isp1301_defer_work(isp, WORK_UPDATE_ISP);
782
783 /* role is host */
784 } else {
785 if (!(otg_ctrl & OTG_ID)) {
786 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
787 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
788 }
789
790 if (isp->otg.host) {
791 switch (isp->otg.state) {
792 case OTG_STATE_B_WAIT_ACON:
793 isp->otg.state = OTG_STATE_B_HOST;
794 pr_debug(" --> b_host\n");
795 kick = 1;
796 break;
797 case OTG_STATE_A_WAIT_BCON:
798 isp->otg.state = OTG_STATE_A_HOST;
799 pr_debug(" --> a_host\n");
800 break;
801 case OTG_STATE_A_PERIPHERAL:
802 isp->otg.state = OTG_STATE_A_WAIT_BCON;
803 pr_debug(" --> a_wait_bcon\n");
804 break;
805 default:
806 break;
807 }
808 isp1301_defer_work(isp, WORK_HOST_RESUME);
809 }
810 }
811
812 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
813 ret = IRQ_HANDLED;
814
815 if (kick)
816 usb_bus_start_enum(isp->otg.host,
817 isp->otg.host->otg_port);
818 }
819
820 check_state(isp, __func__);
821 return ret;
822 }
823
824 static struct platform_device *otg_dev;
825
isp1301_otg_init(struct isp1301 * isp)826 static int isp1301_otg_init(struct isp1301 *isp)
827 {
828 u32 l;
829
830 if (!otg_dev)
831 return -ENODEV;
832
833 dump_regs(isp, __func__);
834 /* some of these values are board-specific... */
835 l = omap_readl(OTG_SYSCON_2);
836 l |= OTG_EN
837 /* for B-device: */
838 | SRP_GPDATA /* 9msec Bdev D+ pulse */
839 | SRP_GPDVBUS /* discharge after VBUS pulse */
840 // | (3 << 24) /* 2msec VBUS pulse */
841 /* for A-device: */
842 | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */
843 | SRP_DPW /* detect 167+ns SRP pulses */
844 | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */
845 ;
846 omap_writel(l, OTG_SYSCON_2);
847
848 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
849 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
850
851 check_state(isp, __func__);
852 pr_debug("otg: %s, %s %06x\n",
853 state_name(isp), __func__, omap_readl(OTG_CTRL));
854
855 omap_writew(DRIVER_SWITCH | OPRT_CHG
856 | B_SRP_TMROUT | B_HNP_FAIL
857 | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
858
859 l = omap_readl(OTG_SYSCON_2);
860 l |= OTG_EN;
861 omap_writel(l, OTG_SYSCON_2);
862
863 return 0;
864 }
865
otg_probe(struct platform_device * dev)866 static int otg_probe(struct platform_device *dev)
867 {
868 // struct omap_usb_config *config = dev->platform_data;
869
870 otg_dev = dev;
871 return 0;
872 }
873
otg_remove(struct platform_device * dev)874 static int otg_remove(struct platform_device *dev)
875 {
876 otg_dev = NULL;
877 return 0;
878 }
879
880 static struct platform_driver omap_otg_driver = {
881 .probe = otg_probe,
882 .remove = otg_remove,
883 .driver = {
884 .owner = THIS_MODULE,
885 .name = "omap_otg",
886 },
887 };
888
otg_bind(struct isp1301 * isp)889 static int otg_bind(struct isp1301 *isp)
890 {
891 int status;
892
893 if (otg_dev)
894 return -EBUSY;
895
896 status = platform_driver_register(&omap_otg_driver);
897 if (status < 0)
898 return status;
899
900 if (otg_dev)
901 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
902 0, DRIVER_NAME, isp);
903 else
904 status = -ENODEV;
905
906 if (status < 0)
907 platform_driver_unregister(&omap_otg_driver);
908 return status;
909 }
910
otg_unbind(struct isp1301 * isp)911 static void otg_unbind(struct isp1301 *isp)
912 {
913 if (!otg_dev)
914 return;
915 free_irq(otg_dev->resource[1].start, isp);
916 }
917
918 #else
919
920 /* OTG controller isn't clocked */
921
922 #endif /* CONFIG_USB_OTG */
923
924 /*-------------------------------------------------------------------------*/
925
b_peripheral(struct isp1301 * isp)926 static void b_peripheral(struct isp1301 *isp)
927 {
928 u32 l;
929
930 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
931 omap_writel(l, OTG_CTRL);
932
933 usb_gadget_vbus_connect(isp->otg.gadget);
934
935 #ifdef CONFIG_USB_OTG
936 enable_vbus_draw(isp, 8);
937 otg_update_isp(isp);
938 #else
939 enable_vbus_draw(isp, 100);
940 /* UDC driver just set OTG_BSESSVLD */
941 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
942 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
943 isp->otg.state = OTG_STATE_B_PERIPHERAL;
944 pr_debug(" --> b_peripheral\n");
945 dump_regs(isp, "2periph");
946 #endif
947 }
948
isp_update_otg(struct isp1301 * isp,u8 stat)949 static void isp_update_otg(struct isp1301 *isp, u8 stat)
950 {
951 u8 isp_stat, isp_bstat;
952 enum usb_otg_state state = isp->otg.state;
953
954 if (stat & INTR_BDIS_ACON)
955 pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp));
956
957 /* start certain state transitions right away */
958 isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
959 if (isp_stat & INTR_ID_GND) {
960 if (isp->otg.default_a) {
961 switch (state) {
962 case OTG_STATE_B_IDLE:
963 a_idle(isp, "idle");
964 /* FALLTHROUGH */
965 case OTG_STATE_A_IDLE:
966 enable_vbus_source(isp);
967 /* FALLTHROUGH */
968 case OTG_STATE_A_WAIT_VRISE:
969 /* we skip over OTG_STATE_A_WAIT_BCON, since
970 * the HC will transition to A_HOST (or
971 * A_SUSPEND!) without our noticing except
972 * when HNP is used.
973 */
974 if (isp_stat & INTR_VBUS_VLD)
975 isp->otg.state = OTG_STATE_A_HOST;
976 break;
977 case OTG_STATE_A_WAIT_VFALL:
978 if (!(isp_stat & INTR_SESS_VLD))
979 a_idle(isp, "vfell");
980 break;
981 default:
982 if (!(isp_stat & INTR_VBUS_VLD))
983 isp->otg.state = OTG_STATE_A_VBUS_ERR;
984 break;
985 }
986 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
987 } else {
988 switch (state) {
989 case OTG_STATE_B_PERIPHERAL:
990 case OTG_STATE_B_HOST:
991 case OTG_STATE_B_WAIT_ACON:
992 usb_gadget_vbus_disconnect(isp->otg.gadget);
993 break;
994 default:
995 break;
996 }
997 if (state != OTG_STATE_A_IDLE)
998 a_idle(isp, "id");
999 if (isp->otg.host && state == OTG_STATE_A_IDLE)
1000 isp1301_defer_work(isp, WORK_HOST_RESUME);
1001 isp_bstat = 0;
1002 }
1003 } else {
1004 u32 l;
1005
1006 /* if user unplugged mini-A end of cable,
1007 * don't bypass A_WAIT_VFALL.
1008 */
1009 if (isp->otg.default_a) {
1010 switch (state) {
1011 default:
1012 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1013 break;
1014 case OTG_STATE_A_WAIT_VFALL:
1015 state = OTG_STATE_A_IDLE;
1016 /* khubd may take a while to notice and
1017 * handle this disconnect, so don't go
1018 * to B_IDLE quite yet.
1019 */
1020 break;
1021 case OTG_STATE_A_IDLE:
1022 host_suspend(isp);
1023 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1024 MC1_BDIS_ACON_EN);
1025 isp->otg.state = OTG_STATE_B_IDLE;
1026 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1027 l &= ~OTG_CTRL_BITS;
1028 omap_writel(l, OTG_CTRL);
1029 break;
1030 case OTG_STATE_B_IDLE:
1031 break;
1032 }
1033 }
1034 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1035
1036 switch (isp->otg.state) {
1037 case OTG_STATE_B_PERIPHERAL:
1038 case OTG_STATE_B_WAIT_ACON:
1039 case OTG_STATE_B_HOST:
1040 if (likely(isp_bstat & OTG_B_SESS_VLD))
1041 break;
1042 enable_vbus_draw(isp, 0);
1043 #ifndef CONFIG_USB_OTG
1044 /* UDC driver will clear OTG_BSESSVLD */
1045 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1046 OTG1_DP_PULLDOWN);
1047 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1048 OTG1_DP_PULLUP);
1049 dump_regs(isp, __func__);
1050 #endif
1051 /* FALLTHROUGH */
1052 case OTG_STATE_B_SRP_INIT:
1053 b_idle(isp, __func__);
1054 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1055 omap_writel(l, OTG_CTRL);
1056 /* FALLTHROUGH */
1057 case OTG_STATE_B_IDLE:
1058 if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1059 #ifdef CONFIG_USB_OTG
1060 update_otg1(isp, isp_stat);
1061 update_otg2(isp, isp_bstat);
1062 #endif
1063 b_peripheral(isp);
1064 } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1065 isp_bstat |= OTG_B_SESS_END;
1066 break;
1067 case OTG_STATE_A_WAIT_VFALL:
1068 break;
1069 default:
1070 pr_debug("otg: unsupported b-device %s\n",
1071 state_name(isp));
1072 break;
1073 }
1074 }
1075
1076 if (state != isp->otg.state)
1077 pr_debug(" isp, %s -> %s\n",
1078 otg_state_string(state), state_name(isp));
1079
1080 #ifdef CONFIG_USB_OTG
1081 /* update the OTG controller state to match the isp1301; may
1082 * trigger OPRT_CHG irqs for changes going to the isp1301.
1083 */
1084 update_otg1(isp, isp_stat);
1085 update_otg2(isp, isp_bstat);
1086 check_state(isp, __func__);
1087 #endif
1088
1089 dump_regs(isp, "isp1301->otg");
1090 }
1091
1092 /*-------------------------------------------------------------------------*/
1093
isp1301_clear_latch(struct isp1301 * isp)1094 static u8 isp1301_clear_latch(struct isp1301 *isp)
1095 {
1096 u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1097 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1098 return latch;
1099 }
1100
1101 static void
isp1301_work(struct work_struct * work)1102 isp1301_work(struct work_struct *work)
1103 {
1104 struct isp1301 *isp = container_of(work, struct isp1301, work);
1105 int stop;
1106
1107 /* implicit lock: we're the only task using this device */
1108 isp->working = 1;
1109 do {
1110 stop = test_bit(WORK_STOP, &isp->todo);
1111
1112 #ifdef CONFIG_USB_OTG
1113 /* transfer state from otg engine to isp1301 */
1114 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1115 otg_update_isp(isp);
1116 put_device(&isp->client->dev);
1117 }
1118 #endif
1119 /* transfer state from isp1301 to otg engine */
1120 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1121 u8 stat = isp1301_clear_latch(isp);
1122
1123 isp_update_otg(isp, stat);
1124 put_device(&isp->client->dev);
1125 }
1126
1127 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1128 u32 otg_ctrl;
1129
1130 /*
1131 * skip A_WAIT_VRISE; hc transitions invisibly
1132 * skip A_WAIT_BCON; same.
1133 */
1134 switch (isp->otg.state) {
1135 case OTG_STATE_A_WAIT_BCON:
1136 case OTG_STATE_A_WAIT_VRISE:
1137 isp->otg.state = OTG_STATE_A_HOST;
1138 pr_debug(" --> a_host\n");
1139 otg_ctrl = omap_readl(OTG_CTRL);
1140 otg_ctrl |= OTG_A_BUSREQ;
1141 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1142 & OTG_CTRL_MASK;
1143 omap_writel(otg_ctrl, OTG_CTRL);
1144 break;
1145 case OTG_STATE_B_WAIT_ACON:
1146 isp->otg.state = OTG_STATE_B_HOST;
1147 pr_debug(" --> b_host (acon)\n");
1148 break;
1149 case OTG_STATE_B_HOST:
1150 case OTG_STATE_B_IDLE:
1151 case OTG_STATE_A_IDLE:
1152 break;
1153 default:
1154 pr_debug(" host resume in %s\n",
1155 state_name(isp));
1156 }
1157 host_resume(isp);
1158 // mdelay(10);
1159 put_device(&isp->client->dev);
1160 }
1161
1162 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1163 #ifdef VERBOSE
1164 dump_regs(isp, "timer");
1165 if (!stop)
1166 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1167 #endif
1168 put_device(&isp->client->dev);
1169 }
1170
1171 if (isp->todo)
1172 dev_vdbg(&isp->client->dev,
1173 "work done, todo = 0x%lx\n",
1174 isp->todo);
1175 if (stop) {
1176 dev_dbg(&isp->client->dev, "stop\n");
1177 break;
1178 }
1179 } while (isp->todo);
1180 isp->working = 0;
1181 }
1182
isp1301_irq(int irq,void * isp)1183 static irqreturn_t isp1301_irq(int irq, void *isp)
1184 {
1185 isp1301_defer_work(isp, WORK_UPDATE_OTG);
1186 return IRQ_HANDLED;
1187 }
1188
isp1301_timer(unsigned long _isp)1189 static void isp1301_timer(unsigned long _isp)
1190 {
1191 isp1301_defer_work((void *)_isp, WORK_TIMER);
1192 }
1193
1194 /*-------------------------------------------------------------------------*/
1195
isp1301_release(struct device * dev)1196 static void isp1301_release(struct device *dev)
1197 {
1198 struct isp1301 *isp;
1199
1200 isp = dev_get_drvdata(dev);
1201
1202 /* FIXME -- not with a "new style" driver, it doesn't!! */
1203
1204 /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1205 if (isp->i2c_release)
1206 isp->i2c_release(dev);
1207 kfree (isp);
1208 }
1209
1210 static struct isp1301 *the_transceiver;
1211
isp1301_remove(struct i2c_client * i2c)1212 static int __exit isp1301_remove(struct i2c_client *i2c)
1213 {
1214 struct isp1301 *isp;
1215
1216 isp = i2c_get_clientdata(i2c);
1217
1218 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1219 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1220 free_irq(i2c->irq, isp);
1221 #ifdef CONFIG_USB_OTG
1222 otg_unbind(isp);
1223 #endif
1224 if (machine_is_omap_h2())
1225 gpio_free(2);
1226
1227 isp->timer.data = 0;
1228 set_bit(WORK_STOP, &isp->todo);
1229 del_timer_sync(&isp->timer);
1230 flush_work_sync(&isp->work);
1231
1232 put_device(&i2c->dev);
1233 the_transceiver = NULL;
1234
1235 return 0;
1236 }
1237
1238 /*-------------------------------------------------------------------------*/
1239
1240 /* NOTE: three modes are possible here, only one of which
1241 * will be standards-conformant on any given system:
1242 *
1243 * - OTG mode (dual-role), required if there's a Mini-AB connector
1244 * - HOST mode, for when there's one or more A (host) connectors
1245 * - DEVICE mode, for when there's a B/Mini-B (device) connector
1246 *
1247 * As a rule, you won't have an isp1301 chip unless it's there to
1248 * support the OTG mode. Other modes help testing USB controllers
1249 * in isolation from (full) OTG support, or maybe so later board
1250 * revisions can help to support those feature.
1251 */
1252
1253 #ifdef CONFIG_USB_OTG
1254
isp1301_otg_enable(struct isp1301 * isp)1255 static int isp1301_otg_enable(struct isp1301 *isp)
1256 {
1257 power_up(isp);
1258 isp1301_otg_init(isp);
1259
1260 /* NOTE: since we don't change this, this provides
1261 * a few more interrupts than are strictly needed.
1262 */
1263 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1264 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1265 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1266 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1267
1268 dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1269
1270 return 0;
1271 }
1272
1273 #endif
1274
1275 /* add or disable the host device+driver */
1276 static int
isp1301_set_host(struct otg_transceiver * otg,struct usb_bus * host)1277 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1278 {
1279 struct isp1301 *isp = container_of(otg, struct isp1301, otg);
1280
1281 if (!otg || isp != the_transceiver)
1282 return -ENODEV;
1283
1284 if (!host) {
1285 omap_writew(0, OTG_IRQ_EN);
1286 power_down(isp);
1287 isp->otg.host = NULL;
1288 return 0;
1289 }
1290
1291 #ifdef CONFIG_USB_OTG
1292 isp->otg.host = host;
1293 dev_dbg(&isp->client->dev, "registered host\n");
1294 host_suspend(isp);
1295 if (isp->otg.gadget)
1296 return isp1301_otg_enable(isp);
1297 return 0;
1298
1299 #elif !defined(CONFIG_USB_GADGET_OMAP)
1300 // FIXME update its refcount
1301 isp->otg.host = host;
1302
1303 power_up(isp);
1304
1305 if (machine_is_omap_h2())
1306 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1307
1308 dev_info(&isp->client->dev, "A-Host sessions ok\n");
1309 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1310 INTR_ID_GND);
1311 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1312 INTR_ID_GND);
1313
1314 /* If this has a Mini-AB connector, this mode is highly
1315 * nonstandard ... but can be handy for testing, especially with
1316 * the Mini-A end of an OTG cable. (Or something nonstandard
1317 * like MiniB-to-StandardB, maybe built with a gender mender.)
1318 */
1319 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1320
1321 dump_regs(isp, __func__);
1322
1323 return 0;
1324
1325 #else
1326 dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1327 return -EINVAL;
1328 #endif
1329
1330 }
1331
1332 static int
isp1301_set_peripheral(struct otg_transceiver * otg,struct usb_gadget * gadget)1333 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1334 {
1335 struct isp1301 *isp = container_of(otg, struct isp1301, otg);
1336 #ifndef CONFIG_USB_OTG
1337 u32 l;
1338 #endif
1339
1340 if (!otg || isp != the_transceiver)
1341 return -ENODEV;
1342
1343 if (!gadget) {
1344 omap_writew(0, OTG_IRQ_EN);
1345 if (!isp->otg.default_a)
1346 enable_vbus_draw(isp, 0);
1347 usb_gadget_vbus_disconnect(isp->otg.gadget);
1348 isp->otg.gadget = NULL;
1349 power_down(isp);
1350 return 0;
1351 }
1352
1353 #ifdef CONFIG_USB_OTG
1354 isp->otg.gadget = gadget;
1355 dev_dbg(&isp->client->dev, "registered gadget\n");
1356 /* gadget driver may be suspended until vbus_connect () */
1357 if (isp->otg.host)
1358 return isp1301_otg_enable(isp);
1359 return 0;
1360
1361 #elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1362 isp->otg.gadget = gadget;
1363 // FIXME update its refcount
1364
1365 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1366 l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1367 l |= OTG_ID;
1368 omap_writel(l, OTG_CTRL);
1369
1370 power_up(isp);
1371 isp->otg.state = OTG_STATE_B_IDLE;
1372
1373 if (machine_is_omap_h2() || machine_is_omap_h3())
1374 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1375
1376 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1377 INTR_SESS_VLD);
1378 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1379 INTR_VBUS_VLD);
1380 dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1381 dump_regs(isp, __func__);
1382
1383 /* If this has a Mini-AB connector, this mode is highly
1384 * nonstandard ... but can be handy for testing, so long
1385 * as you don't plug a Mini-A cable into the jack.
1386 */
1387 if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1388 b_peripheral(isp);
1389
1390 return 0;
1391
1392 #else
1393 dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1394 return -EINVAL;
1395 #endif
1396 }
1397
1398
1399 /*-------------------------------------------------------------------------*/
1400
1401 static int
isp1301_set_power(struct otg_transceiver * dev,unsigned mA)1402 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1403 {
1404 if (!the_transceiver)
1405 return -ENODEV;
1406 if (dev->state == OTG_STATE_B_PERIPHERAL)
1407 enable_vbus_draw(the_transceiver, mA);
1408 return 0;
1409 }
1410
1411 static int
isp1301_start_srp(struct otg_transceiver * dev)1412 isp1301_start_srp(struct otg_transceiver *dev)
1413 {
1414 struct isp1301 *isp = container_of(dev, struct isp1301, otg);
1415 u32 otg_ctrl;
1416
1417 if (!dev || isp != the_transceiver
1418 || isp->otg.state != OTG_STATE_B_IDLE)
1419 return -ENODEV;
1420
1421 otg_ctrl = omap_readl(OTG_CTRL);
1422 if (!(otg_ctrl & OTG_BSESSEND))
1423 return -EINVAL;
1424
1425 otg_ctrl |= OTG_B_BUSREQ;
1426 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1427 omap_writel(otg_ctrl, OTG_CTRL);
1428 isp->otg.state = OTG_STATE_B_SRP_INIT;
1429
1430 pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1431 omap_readl(OTG_CTRL));
1432 #ifdef CONFIG_USB_OTG
1433 check_state(isp, __func__);
1434 #endif
1435 return 0;
1436 }
1437
1438 static int
isp1301_start_hnp(struct otg_transceiver * dev)1439 isp1301_start_hnp(struct otg_transceiver *dev)
1440 {
1441 #ifdef CONFIG_USB_OTG
1442 struct isp1301 *isp = container_of(dev, struct isp1301, otg);
1443 u32 l;
1444
1445 if (!dev || isp != the_transceiver)
1446 return -ENODEV;
1447 if (isp->otg.default_a && (isp->otg.host == NULL
1448 || !isp->otg.host->b_hnp_enable))
1449 return -ENOTCONN;
1450 if (!isp->otg.default_a && (isp->otg.gadget == NULL
1451 || !isp->otg.gadget->b_hnp_enable))
1452 return -ENOTCONN;
1453
1454 /* We want hardware to manage most HNP protocol timings.
1455 * So do this part as early as possible...
1456 */
1457 switch (isp->otg.state) {
1458 case OTG_STATE_B_HOST:
1459 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1460 /* caller will suspend next */
1461 break;
1462 case OTG_STATE_A_HOST:
1463 #if 0
1464 /* autoconnect mode avoids irq latency bugs */
1465 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1466 MC1_BDIS_ACON_EN);
1467 #endif
1468 /* caller must suspend then clear A_BUSREQ */
1469 usb_gadget_vbus_connect(isp->otg.gadget);
1470 l = omap_readl(OTG_CTRL);
1471 l |= OTG_A_SETB_HNPEN;
1472 omap_writel(l, OTG_CTRL);
1473
1474 break;
1475 case OTG_STATE_A_PERIPHERAL:
1476 /* initiated by B-Host suspend */
1477 break;
1478 default:
1479 return -EILSEQ;
1480 }
1481 pr_debug("otg: HNP %s, %06x ...\n",
1482 state_name(isp), omap_readl(OTG_CTRL));
1483 check_state(isp, __func__);
1484 return 0;
1485 #else
1486 /* srp-only */
1487 return -EINVAL;
1488 #endif
1489 }
1490
1491 /*-------------------------------------------------------------------------*/
1492
1493 static int __devinit
isp1301_probe(struct i2c_client * i2c,const struct i2c_device_id * id)1494 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1495 {
1496 int status;
1497 struct isp1301 *isp;
1498
1499 if (the_transceiver)
1500 return 0;
1501
1502 isp = kzalloc(sizeof *isp, GFP_KERNEL);
1503 if (!isp)
1504 return 0;
1505
1506 INIT_WORK(&isp->work, isp1301_work);
1507 init_timer(&isp->timer);
1508 isp->timer.function = isp1301_timer;
1509 isp->timer.data = (unsigned long) isp;
1510
1511 i2c_set_clientdata(i2c, isp);
1512 isp->client = i2c;
1513
1514 /* verify the chip (shouldn't be necessary) */
1515 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1516 if (status != I2C_VENDOR_ID_PHILIPS) {
1517 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1518 goto fail;
1519 }
1520 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1521 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1522 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1523 goto fail;
1524 }
1525 isp->i2c_release = i2c->dev.release;
1526 i2c->dev.release = isp1301_release;
1527
1528 /* initial development used chiprev 2.00 */
1529 status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1530 dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1531 status >> 8, status & 0xff);
1532
1533 /* make like power-on reset */
1534 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1535
1536 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1537 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1538
1539 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1540 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1541 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1542 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1543
1544 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1545 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1546 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1547
1548 #ifdef CONFIG_USB_OTG
1549 status = otg_bind(isp);
1550 if (status < 0) {
1551 dev_dbg(&i2c->dev, "can't bind OTG\n");
1552 goto fail;
1553 }
1554 #endif
1555
1556 if (machine_is_omap_h2()) {
1557 /* full speed signaling by default */
1558 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1559 MC1_SPEED);
1560 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1561 MC2_SPD_SUSP_CTRL);
1562
1563 /* IRQ wired at M14 */
1564 omap_cfg_reg(M14_1510_GPIO2);
1565 if (gpio_request(2, "isp1301") == 0)
1566 gpio_direction_input(2);
1567 isp->irq_type = IRQF_TRIGGER_FALLING;
1568 }
1569
1570 isp->irq_type |= IRQF_SAMPLE_RANDOM;
1571 status = request_irq(i2c->irq, isp1301_irq,
1572 isp->irq_type, DRIVER_NAME, isp);
1573 if (status < 0) {
1574 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1575 i2c->irq, status);
1576 goto fail;
1577 }
1578
1579 isp->otg.dev = &i2c->dev;
1580 isp->otg.label = DRIVER_NAME;
1581
1582 isp->otg.set_host = isp1301_set_host,
1583 isp->otg.set_peripheral = isp1301_set_peripheral,
1584 isp->otg.set_power = isp1301_set_power,
1585 isp->otg.start_srp = isp1301_start_srp,
1586 isp->otg.start_hnp = isp1301_start_hnp,
1587
1588 enable_vbus_draw(isp, 0);
1589 power_down(isp);
1590 the_transceiver = isp;
1591
1592 #ifdef CONFIG_USB_OTG
1593 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1594 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1595 #endif
1596
1597 dump_regs(isp, __func__);
1598
1599 #ifdef VERBOSE
1600 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1601 dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1602 #endif
1603
1604 status = otg_set_transceiver(&isp->otg);
1605 if (status < 0)
1606 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1607 status);
1608
1609 return 0;
1610
1611 fail:
1612 kfree(isp);
1613 return -ENODEV;
1614 }
1615
1616 static const struct i2c_device_id isp1301_id[] = {
1617 { "isp1301_omap", 0 },
1618 { }
1619 };
1620 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1621
1622 static struct i2c_driver isp1301_driver = {
1623 .driver = {
1624 .name = "isp1301_omap",
1625 },
1626 .probe = isp1301_probe,
1627 .remove = __exit_p(isp1301_remove),
1628 .id_table = isp1301_id,
1629 };
1630
1631 /*-------------------------------------------------------------------------*/
1632
isp_init(void)1633 static int __init isp_init(void)
1634 {
1635 return i2c_add_driver(&isp1301_driver);
1636 }
1637 subsys_initcall(isp_init);
1638
isp_exit(void)1639 static void __exit isp_exit(void)
1640 {
1641 if (the_transceiver)
1642 otg_set_transceiver(NULL);
1643 i2c_del_driver(&isp1301_driver);
1644 }
1645 module_exit(isp_exit);
1646
1647