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[deliverable/linux.git] / drivers / usb / phy / phy-isp1301-omap.c
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 <mach/mux.h>
40
41 #include <mach/usb.h>
42
43 #undef VERBOSE
44
45
46 #define DRIVER_VERSION "24 August 2004"
47 #define DRIVER_NAME (isp1301_driver.driver.name)
48
49 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
50 MODULE_LICENSE("GPL");
51
52 struct isp1301 {
53 struct usb_phy phy;
54 struct i2c_client *client;
55 void (*i2c_release)(struct device *dev);
56
57 int irq_type;
58
59 u32 last_otg_ctrl;
60 unsigned working:1;
61
62 struct timer_list timer;
63
64 /* use keventd context to change the state for us */
65 struct work_struct work;
66
67 unsigned long todo;
68 # define WORK_UPDATE_ISP 0 /* update ISP from OTG */
69 # define WORK_UPDATE_OTG 1 /* update OTG from ISP */
70 # define WORK_HOST_RESUME 4 /* resume host */
71 # define WORK_TIMER 6 /* timer fired */
72 # define WORK_STOP 7 /* don't resubmit */
73 };
74
75
76 /* bits in OTG_CTRL */
77
78 #define OTG_XCEIV_OUTPUTS \
79 (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
80 #define OTG_XCEIV_INPUTS \
81 (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
82 #define OTG_CTRL_BITS \
83 (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
84 /* and OTG_PULLUP is sometimes written */
85
86 #define OTG_CTRL_MASK (OTG_DRIVER_SEL| \
87 OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
88 OTG_CTRL_BITS)
89
90
91 /*-------------------------------------------------------------------------*/
92
93 /* board-specific PM hooks */
94
95 #if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
96
97 #if defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
98
99 #include <linux/i2c/tps65010.h>
100
101 #else
102
103 static inline int tps65010_set_vbus_draw(unsigned mA)
104 {
105 pr_debug("tps65010: draw %d mA (STUB)\n", mA);
106 return 0;
107 }
108
109 #endif
110
111 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
112 {
113 int status = tps65010_set_vbus_draw(mA);
114 if (status < 0)
115 pr_debug(" VBUS %d mA error %d\n", mA, status);
116 }
117
118 #else
119
120 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
121 {
122 /* H4 controls this by DIP switch S2.4; no soft control.
123 * ON means the charger is always enabled. Leave it OFF
124 * unless the OTG port is used only in B-peripheral mode.
125 */
126 }
127
128 #endif
129
130 static void enable_vbus_source(struct isp1301 *isp)
131 {
132 /* this board won't supply more than 8mA vbus power.
133 * some boards can switch a 100ma "unit load" (or more).
134 */
135 }
136
137
138 /* products will deliver OTG messages with LEDs, GUI, etc */
139 static inline void notresponding(struct isp1301 *isp)
140 {
141 printk(KERN_NOTICE "OTG device not responding.\n");
142 }
143
144
145 /*-------------------------------------------------------------------------*/
146
147 static struct i2c_driver isp1301_driver;
148
149 /* smbus apis are used for portability */
150
151 static inline u8
152 isp1301_get_u8(struct isp1301 *isp, u8 reg)
153 {
154 return i2c_smbus_read_byte_data(isp->client, reg + 0);
155 }
156
157 static inline int
158 isp1301_get_u16(struct isp1301 *isp, u8 reg)
159 {
160 return i2c_smbus_read_word_data(isp->client, reg);
161 }
162
163 static inline int
164 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
165 {
166 return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
167 }
168
169 static inline int
170 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
171 {
172 return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
173 }
174
175 /*-------------------------------------------------------------------------*/
176
177 /* identification */
178 #define ISP1301_VENDOR_ID 0x00 /* u16 read */
179 #define ISP1301_PRODUCT_ID 0x02 /* u16 read */
180 #define ISP1301_BCD_DEVICE 0x14 /* u16 read */
181
182 #define I2C_VENDOR_ID_PHILIPS 0x04cc
183 #define I2C_PRODUCT_ID_PHILIPS_1301 0x1301
184
185 /* operational registers */
186 #define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */
187 # define MC1_SPEED (1 << 0)
188 # define MC1_SUSPEND (1 << 1)
189 # define MC1_DAT_SE0 (1 << 2)
190 # define MC1_TRANSPARENT (1 << 3)
191 # define MC1_BDIS_ACON_EN (1 << 4)
192 # define MC1_OE_INT_EN (1 << 5)
193 # define MC1_UART_EN (1 << 6)
194 # define MC1_MASK 0x7f
195 #define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */
196 # define MC2_GLOBAL_PWR_DN (1 << 0)
197 # define MC2_SPD_SUSP_CTRL (1 << 1)
198 # define MC2_BI_DI (1 << 2)
199 # define MC2_TRANSP_BDIR0 (1 << 3)
200 # define MC2_TRANSP_BDIR1 (1 << 4)
201 # define MC2_AUDIO_EN (1 << 5)
202 # define MC2_PSW_EN (1 << 6)
203 # define MC2_EN2V7 (1 << 7)
204 #define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */
205 # define OTG1_DP_PULLUP (1 << 0)
206 # define OTG1_DM_PULLUP (1 << 1)
207 # define OTG1_DP_PULLDOWN (1 << 2)
208 # define OTG1_DM_PULLDOWN (1 << 3)
209 # define OTG1_ID_PULLDOWN (1 << 4)
210 # define OTG1_VBUS_DRV (1 << 5)
211 # define OTG1_VBUS_DISCHRG (1 << 6)
212 # define OTG1_VBUS_CHRG (1 << 7)
213 #define ISP1301_OTG_STATUS 0x10 /* u8 readonly */
214 # define OTG_B_SESS_END (1 << 6)
215 # define OTG_B_SESS_VLD (1 << 7)
216
217 #define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */
218 #define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */
219
220 #define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */
221 #define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */
222
223 /* same bitfields in all interrupt registers */
224 # define INTR_VBUS_VLD (1 << 0)
225 # define INTR_SESS_VLD (1 << 1)
226 # define INTR_DP_HI (1 << 2)
227 # define INTR_ID_GND (1 << 3)
228 # define INTR_DM_HI (1 << 4)
229 # define INTR_ID_FLOAT (1 << 5)
230 # define INTR_BDIS_ACON (1 << 6)
231 # define INTR_CR_INT (1 << 7)
232
233 /*-------------------------------------------------------------------------*/
234
235 static inline const char *state_name(struct isp1301 *isp)
236 {
237 return usb_otg_state_string(isp->phy.state);
238 }
239
240 /*-------------------------------------------------------------------------*/
241
242 /* NOTE: some of this ISP1301 setup is specific to H2 boards;
243 * not everything is guarded by board-specific checks, or even using
244 * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
245 *
246 * ALSO: this currently doesn't use ISP1301 low-power modes
247 * while OTG is running.
248 */
249
250 static void power_down(struct isp1301 *isp)
251 {
252 isp->phy.state = OTG_STATE_UNDEFINED;
253
254 // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
255 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
256
257 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
258 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
259 }
260
261 static void power_up(struct isp1301 *isp)
262 {
263 // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
264 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
265
266 /* do this only when cpu is driving transceiver,
267 * so host won't see a low speed device...
268 */
269 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
270 }
271
272 #define NO_HOST_SUSPEND
273
274 static int host_suspend(struct isp1301 *isp)
275 {
276 #ifdef NO_HOST_SUSPEND
277 return 0;
278 #else
279 struct device *dev;
280
281 if (!isp->phy.otg->host)
282 return -ENODEV;
283
284 /* Currently ASSUMES only the OTG port matters;
285 * other ports could be active...
286 */
287 dev = isp->phy.otg->host->controller;
288 return dev->driver->suspend(dev, 3, 0);
289 #endif
290 }
291
292 static int host_resume(struct isp1301 *isp)
293 {
294 #ifdef NO_HOST_SUSPEND
295 return 0;
296 #else
297 struct device *dev;
298
299 if (!isp->phy.otg->host)
300 return -ENODEV;
301
302 dev = isp->phy.otg->host->controller;
303 return dev->driver->resume(dev, 0);
304 #endif
305 }
306
307 static int gadget_suspend(struct isp1301 *isp)
308 {
309 isp->phy.otg->gadget->b_hnp_enable = 0;
310 isp->phy.otg->gadget->a_hnp_support = 0;
311 isp->phy.otg->gadget->a_alt_hnp_support = 0;
312 return usb_gadget_vbus_disconnect(isp->phy.otg->gadget);
313 }
314
315 /*-------------------------------------------------------------------------*/
316
317 #define TIMER_MINUTES 10
318 #define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ)
319
320 /* Almost all our I2C messaging comes from a work queue's task context.
321 * NOTE: guaranteeing certain response times might mean we shouldn't
322 * share keventd's work queue; a realtime task might be safest.
323 */
324 static void isp1301_defer_work(struct isp1301 *isp, int work)
325 {
326 int status;
327
328 if (isp && !test_and_set_bit(work, &isp->todo)) {
329 (void) get_device(&isp->client->dev);
330 status = schedule_work(&isp->work);
331 if (!status && !isp->working)
332 dev_vdbg(&isp->client->dev,
333 "work item %d may be lost\n", work);
334 }
335 }
336
337 /* called from irq handlers */
338 static void a_idle(struct isp1301 *isp, const char *tag)
339 {
340 u32 l;
341
342 if (isp->phy.state == OTG_STATE_A_IDLE)
343 return;
344
345 isp->phy.otg->default_a = 1;
346 if (isp->phy.otg->host) {
347 isp->phy.otg->host->is_b_host = 0;
348 host_suspend(isp);
349 }
350 if (isp->phy.otg->gadget) {
351 isp->phy.otg->gadget->is_a_peripheral = 1;
352 gadget_suspend(isp);
353 }
354 isp->phy.state = OTG_STATE_A_IDLE;
355 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
356 omap_writel(l, OTG_CTRL);
357 isp->last_otg_ctrl = l;
358 pr_debug(" --> %s/%s\n", state_name(isp), tag);
359 }
360
361 /* called from irq handlers */
362 static void b_idle(struct isp1301 *isp, const char *tag)
363 {
364 u32 l;
365
366 if (isp->phy.state == OTG_STATE_B_IDLE)
367 return;
368
369 isp->phy.otg->default_a = 0;
370 if (isp->phy.otg->host) {
371 isp->phy.otg->host->is_b_host = 1;
372 host_suspend(isp);
373 }
374 if (isp->phy.otg->gadget) {
375 isp->phy.otg->gadget->is_a_peripheral = 0;
376 gadget_suspend(isp);
377 }
378 isp->phy.state = OTG_STATE_B_IDLE;
379 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
380 omap_writel(l, OTG_CTRL);
381 isp->last_otg_ctrl = l;
382 pr_debug(" --> %s/%s\n", state_name(isp), tag);
383 }
384
385 static void
386 dump_regs(struct isp1301 *isp, const char *label)
387 {
388 u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
389 u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
390 u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
391
392 pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
393 omap_readl(OTG_CTRL), label, state_name(isp),
394 ctrl, status, src);
395 /* mode control and irq enables don't change much */
396 }
397
398 /*-------------------------------------------------------------------------*/
399
400 #ifdef CONFIG_USB_OTG
401
402 /*
403 * The OMAP OTG controller handles most of the OTG state transitions.
404 *
405 * We translate isp1301 outputs (mostly voltage comparator status) into
406 * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
407 * flags into isp1301 inputs ... and infer state transitions.
408 */
409
410 #ifdef VERBOSE
411
412 static void check_state(struct isp1301 *isp, const char *tag)
413 {
414 enum usb_otg_state state = OTG_STATE_UNDEFINED;
415 u8 fsm = omap_readw(OTG_TEST) & 0x0ff;
416 unsigned extra = 0;
417
418 switch (fsm) {
419
420 /* default-b */
421 case 0x0:
422 state = OTG_STATE_B_IDLE;
423 break;
424 case 0x3:
425 case 0x7:
426 extra = 1;
427 case 0x1:
428 state = OTG_STATE_B_PERIPHERAL;
429 break;
430 case 0x11:
431 state = OTG_STATE_B_SRP_INIT;
432 break;
433
434 /* extra dual-role default-b states */
435 case 0x12:
436 case 0x13:
437 case 0x16:
438 extra = 1;
439 case 0x17:
440 state = OTG_STATE_B_WAIT_ACON;
441 break;
442 case 0x34:
443 state = OTG_STATE_B_HOST;
444 break;
445
446 /* default-a */
447 case 0x36:
448 state = OTG_STATE_A_IDLE;
449 break;
450 case 0x3c:
451 state = OTG_STATE_A_WAIT_VFALL;
452 break;
453 case 0x7d:
454 state = OTG_STATE_A_VBUS_ERR;
455 break;
456 case 0x9e:
457 case 0x9f:
458 extra = 1;
459 case 0x89:
460 state = OTG_STATE_A_PERIPHERAL;
461 break;
462 case 0xb7:
463 state = OTG_STATE_A_WAIT_VRISE;
464 break;
465 case 0xb8:
466 state = OTG_STATE_A_WAIT_BCON;
467 break;
468 case 0xb9:
469 state = OTG_STATE_A_HOST;
470 break;
471 case 0xba:
472 state = OTG_STATE_A_SUSPEND;
473 break;
474 default:
475 break;
476 }
477 if (isp->phy.state == state && !extra)
478 return;
479 pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
480 usb_otg_state_string(state), fsm, state_name(isp),
481 omap_readl(OTG_CTRL));
482 }
483
484 #else
485
486 static inline void check_state(struct isp1301 *isp, const char *tag) { }
487
488 #endif
489
490 /* outputs from ISP1301_INTERRUPT_SOURCE */
491 static void update_otg1(struct isp1301 *isp, u8 int_src)
492 {
493 u32 otg_ctrl;
494
495 otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
496 otg_ctrl &= ~OTG_XCEIV_INPUTS;
497 otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
498
499 if (int_src & INTR_SESS_VLD)
500 otg_ctrl |= OTG_ASESSVLD;
501 else if (isp->phy.state == OTG_STATE_A_WAIT_VFALL) {
502 a_idle(isp, "vfall");
503 otg_ctrl &= ~OTG_CTRL_BITS;
504 }
505 if (int_src & INTR_VBUS_VLD)
506 otg_ctrl |= OTG_VBUSVLD;
507 if (int_src & INTR_ID_GND) { /* default-A */
508 if (isp->phy.state == OTG_STATE_B_IDLE
509 || isp->phy.state
510 == OTG_STATE_UNDEFINED) {
511 a_idle(isp, "init");
512 return;
513 }
514 } else { /* default-B */
515 otg_ctrl |= OTG_ID;
516 if (isp->phy.state == OTG_STATE_A_IDLE
517 || isp->phy.state == OTG_STATE_UNDEFINED) {
518 b_idle(isp, "init");
519 return;
520 }
521 }
522 omap_writel(otg_ctrl, OTG_CTRL);
523 }
524
525 /* outputs from ISP1301_OTG_STATUS */
526 static void update_otg2(struct isp1301 *isp, u8 otg_status)
527 {
528 u32 otg_ctrl;
529
530 otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
531 otg_ctrl &= ~OTG_XCEIV_INPUTS;
532 otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
533 if (otg_status & OTG_B_SESS_VLD)
534 otg_ctrl |= OTG_BSESSVLD;
535 else if (otg_status & OTG_B_SESS_END)
536 otg_ctrl |= OTG_BSESSEND;
537 omap_writel(otg_ctrl, OTG_CTRL);
538 }
539
540 /* inputs going to ISP1301 */
541 static void otg_update_isp(struct isp1301 *isp)
542 {
543 u32 otg_ctrl, otg_change;
544 u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
545
546 otg_ctrl = omap_readl(OTG_CTRL);
547 otg_change = otg_ctrl ^ isp->last_otg_ctrl;
548 isp->last_otg_ctrl = otg_ctrl;
549 otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
550
551 switch (isp->phy.state) {
552 case OTG_STATE_B_IDLE:
553 case OTG_STATE_B_PERIPHERAL:
554 case OTG_STATE_B_SRP_INIT:
555 if (!(otg_ctrl & OTG_PULLUP)) {
556 // if (otg_ctrl & OTG_B_HNPEN) {
557 if (isp->phy.otg->gadget->b_hnp_enable) {
558 isp->phy.state = OTG_STATE_B_WAIT_ACON;
559 pr_debug(" --> b_wait_acon\n");
560 }
561 goto pulldown;
562 }
563 pullup:
564 set |= OTG1_DP_PULLUP;
565 clr |= OTG1_DP_PULLDOWN;
566 break;
567 case OTG_STATE_A_SUSPEND:
568 case OTG_STATE_A_PERIPHERAL:
569 if (otg_ctrl & OTG_PULLUP)
570 goto pullup;
571 /* FALLTHROUGH */
572 // case OTG_STATE_B_WAIT_ACON:
573 default:
574 pulldown:
575 set |= OTG1_DP_PULLDOWN;
576 clr |= OTG1_DP_PULLUP;
577 break;
578 }
579
580 # define toggle(OTG,ISP) do { \
581 if (otg_ctrl & OTG) set |= ISP; \
582 else clr |= ISP; \
583 } while (0)
584
585 if (!(isp->phy.otg->host))
586 otg_ctrl &= ~OTG_DRV_VBUS;
587
588 switch (isp->phy.state) {
589 case OTG_STATE_A_SUSPEND:
590 if (otg_ctrl & OTG_DRV_VBUS) {
591 set |= OTG1_VBUS_DRV;
592 break;
593 }
594 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
595 notresponding(isp);
596
597 /* FALLTHROUGH */
598 case OTG_STATE_A_VBUS_ERR:
599 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
600 pr_debug(" --> a_wait_vfall\n");
601 /* FALLTHROUGH */
602 case OTG_STATE_A_WAIT_VFALL:
603 /* FIXME usbcore thinks port power is still on ... */
604 clr |= OTG1_VBUS_DRV;
605 break;
606 case OTG_STATE_A_IDLE:
607 if (otg_ctrl & OTG_DRV_VBUS) {
608 isp->phy.state = OTG_STATE_A_WAIT_VRISE;
609 pr_debug(" --> a_wait_vrise\n");
610 }
611 /* FALLTHROUGH */
612 default:
613 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
614 }
615
616 toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
617 toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
618
619 # undef toggle
620
621 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
622 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
623
624 /* HNP switch to host or peripheral; and SRP */
625 if (otg_change & OTG_PULLUP) {
626 u32 l;
627
628 switch (isp->phy.state) {
629 case OTG_STATE_B_IDLE:
630 if (clr & OTG1_DP_PULLUP)
631 break;
632 isp->phy.state = OTG_STATE_B_PERIPHERAL;
633 pr_debug(" --> b_peripheral\n");
634 break;
635 case OTG_STATE_A_SUSPEND:
636 if (clr & OTG1_DP_PULLUP)
637 break;
638 isp->phy.state = OTG_STATE_A_PERIPHERAL;
639 pr_debug(" --> a_peripheral\n");
640 break;
641 default:
642 break;
643 }
644 l = omap_readl(OTG_CTRL);
645 l |= OTG_PULLUP;
646 omap_writel(l, OTG_CTRL);
647 }
648
649 check_state(isp, __func__);
650 dump_regs(isp, "otg->isp1301");
651 }
652
653 static irqreturn_t omap_otg_irq(int irq, void *_isp)
654 {
655 u16 otg_irq = omap_readw(OTG_IRQ_SRC);
656 u32 otg_ctrl;
657 int ret = IRQ_NONE;
658 struct isp1301 *isp = _isp;
659 struct usb_otg *otg = isp->phy.otg;
660
661 /* update ISP1301 transceiver from OTG controller */
662 if (otg_irq & OPRT_CHG) {
663 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
664 isp1301_defer_work(isp, WORK_UPDATE_ISP);
665 ret = IRQ_HANDLED;
666
667 /* SRP to become b_peripheral failed */
668 } else if (otg_irq & B_SRP_TMROUT) {
669 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
670 notresponding(isp);
671
672 /* gadget drivers that care should monitor all kinds of
673 * remote wakeup (SRP, normal) using their own timer
674 * to give "check cable and A-device" messages.
675 */
676 if (isp->phy.state == OTG_STATE_B_SRP_INIT)
677 b_idle(isp, "srp_timeout");
678
679 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
680 ret = IRQ_HANDLED;
681
682 /* HNP to become b_host failed */
683 } else if (otg_irq & B_HNP_FAIL) {
684 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
685 state_name(isp), omap_readl(OTG_CTRL));
686 notresponding(isp);
687
688 otg_ctrl = omap_readl(OTG_CTRL);
689 otg_ctrl |= OTG_BUSDROP;
690 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
691 omap_writel(otg_ctrl, OTG_CTRL);
692
693 /* subset of b_peripheral()... */
694 isp->phy.state = OTG_STATE_B_PERIPHERAL;
695 pr_debug(" --> b_peripheral\n");
696
697 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
698 ret = IRQ_HANDLED;
699
700 /* detect SRP from B-device ... */
701 } else if (otg_irq & A_SRP_DETECT) {
702 pr_debug("otg: %s SRP_DETECT, %06x\n",
703 state_name(isp), omap_readl(OTG_CTRL));
704
705 isp1301_defer_work(isp, WORK_UPDATE_OTG);
706 switch (isp->phy.state) {
707 case OTG_STATE_A_IDLE:
708 if (!otg->host)
709 break;
710 isp1301_defer_work(isp, WORK_HOST_RESUME);
711 otg_ctrl = omap_readl(OTG_CTRL);
712 otg_ctrl |= OTG_A_BUSREQ;
713 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
714 & ~OTG_XCEIV_INPUTS
715 & OTG_CTRL_MASK;
716 omap_writel(otg_ctrl, OTG_CTRL);
717 break;
718 default:
719 break;
720 }
721
722 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
723 ret = IRQ_HANDLED;
724
725 /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise)
726 * we don't track them separately
727 */
728 } else if (otg_irq & A_REQ_TMROUT) {
729 otg_ctrl = omap_readl(OTG_CTRL);
730 pr_info("otg: BCON_TMOUT from %s, %06x\n",
731 state_name(isp), otg_ctrl);
732 notresponding(isp);
733
734 otg_ctrl |= OTG_BUSDROP;
735 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
736 omap_writel(otg_ctrl, OTG_CTRL);
737 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
738
739 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
740 ret = IRQ_HANDLED;
741
742 /* A-supplied voltage fell too low; overcurrent */
743 } else if (otg_irq & A_VBUS_ERR) {
744 otg_ctrl = omap_readl(OTG_CTRL);
745 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
746 state_name(isp), otg_irq, otg_ctrl);
747
748 otg_ctrl |= OTG_BUSDROP;
749 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
750 omap_writel(otg_ctrl, OTG_CTRL);
751 isp->phy.state = OTG_STATE_A_VBUS_ERR;
752
753 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
754 ret = IRQ_HANDLED;
755
756 /* switch driver; the transceiver code activates it,
757 * ungating the udc clock or resuming OHCI.
758 */
759 } else if (otg_irq & DRIVER_SWITCH) {
760 int kick = 0;
761
762 otg_ctrl = omap_readl(OTG_CTRL);
763 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
764 state_name(isp),
765 (otg_ctrl & OTG_DRIVER_SEL)
766 ? "gadget" : "host",
767 otg_ctrl);
768 isp1301_defer_work(isp, WORK_UPDATE_ISP);
769
770 /* role is peripheral */
771 if (otg_ctrl & OTG_DRIVER_SEL) {
772 switch (isp->phy.state) {
773 case OTG_STATE_A_IDLE:
774 b_idle(isp, __func__);
775 break;
776 default:
777 break;
778 }
779 isp1301_defer_work(isp, WORK_UPDATE_ISP);
780
781 /* role is host */
782 } else {
783 if (!(otg_ctrl & OTG_ID)) {
784 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
785 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
786 }
787
788 if (otg->host) {
789 switch (isp->phy.state) {
790 case OTG_STATE_B_WAIT_ACON:
791 isp->phy.state = OTG_STATE_B_HOST;
792 pr_debug(" --> b_host\n");
793 kick = 1;
794 break;
795 case OTG_STATE_A_WAIT_BCON:
796 isp->phy.state = OTG_STATE_A_HOST;
797 pr_debug(" --> a_host\n");
798 break;
799 case OTG_STATE_A_PERIPHERAL:
800 isp->phy.state = OTG_STATE_A_WAIT_BCON;
801 pr_debug(" --> a_wait_bcon\n");
802 break;
803 default:
804 break;
805 }
806 isp1301_defer_work(isp, WORK_HOST_RESUME);
807 }
808 }
809
810 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
811 ret = IRQ_HANDLED;
812
813 if (kick)
814 usb_bus_start_enum(otg->host, otg->host->otg_port);
815 }
816
817 check_state(isp, __func__);
818 return ret;
819 }
820
821 static struct platform_device *otg_dev;
822
823 static int isp1301_otg_init(struct isp1301 *isp)
824 {
825 u32 l;
826
827 if (!otg_dev)
828 return -ENODEV;
829
830 dump_regs(isp, __func__);
831 /* some of these values are board-specific... */
832 l = omap_readl(OTG_SYSCON_2);
833 l |= OTG_EN
834 /* for B-device: */
835 | SRP_GPDATA /* 9msec Bdev D+ pulse */
836 | SRP_GPDVBUS /* discharge after VBUS pulse */
837 // | (3 << 24) /* 2msec VBUS pulse */
838 /* for A-device: */
839 | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */
840 | SRP_DPW /* detect 167+ns SRP pulses */
841 | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */
842 ;
843 omap_writel(l, OTG_SYSCON_2);
844
845 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
846 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
847
848 check_state(isp, __func__);
849 pr_debug("otg: %s, %s %06x\n",
850 state_name(isp), __func__, omap_readl(OTG_CTRL));
851
852 omap_writew(DRIVER_SWITCH | OPRT_CHG
853 | B_SRP_TMROUT | B_HNP_FAIL
854 | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
855
856 l = omap_readl(OTG_SYSCON_2);
857 l |= OTG_EN;
858 omap_writel(l, OTG_SYSCON_2);
859
860 return 0;
861 }
862
863 static int otg_probe(struct platform_device *dev)
864 {
865 // struct omap_usb_config *config = dev->platform_data;
866
867 otg_dev = dev;
868 return 0;
869 }
870
871 static int otg_remove(struct platform_device *dev)
872 {
873 otg_dev = NULL;
874 return 0;
875 }
876
877 static struct platform_driver omap_otg_driver = {
878 .probe = otg_probe,
879 .remove = otg_remove,
880 .driver = {
881 .owner = THIS_MODULE,
882 .name = "omap_otg",
883 },
884 };
885
886 static int otg_bind(struct isp1301 *isp)
887 {
888 int status;
889
890 if (otg_dev)
891 return -EBUSY;
892
893 status = platform_driver_register(&omap_otg_driver);
894 if (status < 0)
895 return status;
896
897 if (otg_dev)
898 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
899 0, DRIVER_NAME, isp);
900 else
901 status = -ENODEV;
902
903 if (status < 0)
904 platform_driver_unregister(&omap_otg_driver);
905 return status;
906 }
907
908 static void otg_unbind(struct isp1301 *isp)
909 {
910 if (!otg_dev)
911 return;
912 free_irq(otg_dev->resource[1].start, isp);
913 }
914
915 #else
916
917 /* OTG controller isn't clocked */
918
919 #endif /* CONFIG_USB_OTG */
920
921 /*-------------------------------------------------------------------------*/
922
923 static void b_peripheral(struct isp1301 *isp)
924 {
925 u32 l;
926
927 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
928 omap_writel(l, OTG_CTRL);
929
930 usb_gadget_vbus_connect(isp->phy.otg->gadget);
931
932 #ifdef CONFIG_USB_OTG
933 enable_vbus_draw(isp, 8);
934 otg_update_isp(isp);
935 #else
936 enable_vbus_draw(isp, 100);
937 /* UDC driver just set OTG_BSESSVLD */
938 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
939 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
940 isp->phy.state = OTG_STATE_B_PERIPHERAL;
941 pr_debug(" --> b_peripheral\n");
942 dump_regs(isp, "2periph");
943 #endif
944 }
945
946 static void isp_update_otg(struct isp1301 *isp, u8 stat)
947 {
948 struct usb_otg *otg = isp->phy.otg;
949 u8 isp_stat, isp_bstat;
950 enum usb_otg_state state = isp->phy.state;
951
952 if (stat & INTR_BDIS_ACON)
953 pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp));
954
955 /* start certain state transitions right away */
956 isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
957 if (isp_stat & INTR_ID_GND) {
958 if (otg->default_a) {
959 switch (state) {
960 case OTG_STATE_B_IDLE:
961 a_idle(isp, "idle");
962 /* FALLTHROUGH */
963 case OTG_STATE_A_IDLE:
964 enable_vbus_source(isp);
965 /* FALLTHROUGH */
966 case OTG_STATE_A_WAIT_VRISE:
967 /* we skip over OTG_STATE_A_WAIT_BCON, since
968 * the HC will transition to A_HOST (or
969 * A_SUSPEND!) without our noticing except
970 * when HNP is used.
971 */
972 if (isp_stat & INTR_VBUS_VLD)
973 isp->phy.state = OTG_STATE_A_HOST;
974 break;
975 case OTG_STATE_A_WAIT_VFALL:
976 if (!(isp_stat & INTR_SESS_VLD))
977 a_idle(isp, "vfell");
978 break;
979 default:
980 if (!(isp_stat & INTR_VBUS_VLD))
981 isp->phy.state = OTG_STATE_A_VBUS_ERR;
982 break;
983 }
984 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
985 } else {
986 switch (state) {
987 case OTG_STATE_B_PERIPHERAL:
988 case OTG_STATE_B_HOST:
989 case OTG_STATE_B_WAIT_ACON:
990 usb_gadget_vbus_disconnect(otg->gadget);
991 break;
992 default:
993 break;
994 }
995 if (state != OTG_STATE_A_IDLE)
996 a_idle(isp, "id");
997 if (otg->host && state == OTG_STATE_A_IDLE)
998 isp1301_defer_work(isp, WORK_HOST_RESUME);
999 isp_bstat = 0;
1000 }
1001 } else {
1002 u32 l;
1003
1004 /* if user unplugged mini-A end of cable,
1005 * don't bypass A_WAIT_VFALL.
1006 */
1007 if (otg->default_a) {
1008 switch (state) {
1009 default:
1010 isp->phy.state = OTG_STATE_A_WAIT_VFALL;
1011 break;
1012 case OTG_STATE_A_WAIT_VFALL:
1013 state = OTG_STATE_A_IDLE;
1014 /* hub_wq may take a while to notice and
1015 * handle this disconnect, so don't go
1016 * to B_IDLE quite yet.
1017 */
1018 break;
1019 case OTG_STATE_A_IDLE:
1020 host_suspend(isp);
1021 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1022 MC1_BDIS_ACON_EN);
1023 isp->phy.state = OTG_STATE_B_IDLE;
1024 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1025 l &= ~OTG_CTRL_BITS;
1026 omap_writel(l, OTG_CTRL);
1027 break;
1028 case OTG_STATE_B_IDLE:
1029 break;
1030 }
1031 }
1032 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1033
1034 switch (isp->phy.state) {
1035 case OTG_STATE_B_PERIPHERAL:
1036 case OTG_STATE_B_WAIT_ACON:
1037 case OTG_STATE_B_HOST:
1038 if (likely(isp_bstat & OTG_B_SESS_VLD))
1039 break;
1040 enable_vbus_draw(isp, 0);
1041 #ifndef CONFIG_USB_OTG
1042 /* UDC driver will clear OTG_BSESSVLD */
1043 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1044 OTG1_DP_PULLDOWN);
1045 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1046 OTG1_DP_PULLUP);
1047 dump_regs(isp, __func__);
1048 #endif
1049 /* FALLTHROUGH */
1050 case OTG_STATE_B_SRP_INIT:
1051 b_idle(isp, __func__);
1052 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1053 omap_writel(l, OTG_CTRL);
1054 /* FALLTHROUGH */
1055 case OTG_STATE_B_IDLE:
1056 if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1057 #ifdef CONFIG_USB_OTG
1058 update_otg1(isp, isp_stat);
1059 update_otg2(isp, isp_bstat);
1060 #endif
1061 b_peripheral(isp);
1062 } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1063 isp_bstat |= OTG_B_SESS_END;
1064 break;
1065 case OTG_STATE_A_WAIT_VFALL:
1066 break;
1067 default:
1068 pr_debug("otg: unsupported b-device %s\n",
1069 state_name(isp));
1070 break;
1071 }
1072 }
1073
1074 if (state != isp->phy.state)
1075 pr_debug(" isp, %s -> %s\n",
1076 usb_otg_state_string(state), state_name(isp));
1077
1078 #ifdef CONFIG_USB_OTG
1079 /* update the OTG controller state to match the isp1301; may
1080 * trigger OPRT_CHG irqs for changes going to the isp1301.
1081 */
1082 update_otg1(isp, isp_stat);
1083 update_otg2(isp, isp_bstat);
1084 check_state(isp, __func__);
1085 #endif
1086
1087 dump_regs(isp, "isp1301->otg");
1088 }
1089
1090 /*-------------------------------------------------------------------------*/
1091
1092 static u8 isp1301_clear_latch(struct isp1301 *isp)
1093 {
1094 u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1095 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1096 return latch;
1097 }
1098
1099 static void
1100 isp1301_work(struct work_struct *work)
1101 {
1102 struct isp1301 *isp = container_of(work, struct isp1301, work);
1103 int stop;
1104
1105 /* implicit lock: we're the only task using this device */
1106 isp->working = 1;
1107 do {
1108 stop = test_bit(WORK_STOP, &isp->todo);
1109
1110 #ifdef CONFIG_USB_OTG
1111 /* transfer state from otg engine to isp1301 */
1112 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1113 otg_update_isp(isp);
1114 put_device(&isp->client->dev);
1115 }
1116 #endif
1117 /* transfer state from isp1301 to otg engine */
1118 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1119 u8 stat = isp1301_clear_latch(isp);
1120
1121 isp_update_otg(isp, stat);
1122 put_device(&isp->client->dev);
1123 }
1124
1125 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1126 u32 otg_ctrl;
1127
1128 /*
1129 * skip A_WAIT_VRISE; hc transitions invisibly
1130 * skip A_WAIT_BCON; same.
1131 */
1132 switch (isp->phy.state) {
1133 case OTG_STATE_A_WAIT_BCON:
1134 case OTG_STATE_A_WAIT_VRISE:
1135 isp->phy.state = OTG_STATE_A_HOST;
1136 pr_debug(" --> a_host\n");
1137 otg_ctrl = omap_readl(OTG_CTRL);
1138 otg_ctrl |= OTG_A_BUSREQ;
1139 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1140 & OTG_CTRL_MASK;
1141 omap_writel(otg_ctrl, OTG_CTRL);
1142 break;
1143 case OTG_STATE_B_WAIT_ACON:
1144 isp->phy.state = OTG_STATE_B_HOST;
1145 pr_debug(" --> b_host (acon)\n");
1146 break;
1147 case OTG_STATE_B_HOST:
1148 case OTG_STATE_B_IDLE:
1149 case OTG_STATE_A_IDLE:
1150 break;
1151 default:
1152 pr_debug(" host resume in %s\n",
1153 state_name(isp));
1154 }
1155 host_resume(isp);
1156 // mdelay(10);
1157 put_device(&isp->client->dev);
1158 }
1159
1160 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1161 #ifdef VERBOSE
1162 dump_regs(isp, "timer");
1163 if (!stop)
1164 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1165 #endif
1166 put_device(&isp->client->dev);
1167 }
1168
1169 if (isp->todo)
1170 dev_vdbg(&isp->client->dev,
1171 "work done, todo = 0x%lx\n",
1172 isp->todo);
1173 if (stop) {
1174 dev_dbg(&isp->client->dev, "stop\n");
1175 break;
1176 }
1177 } while (isp->todo);
1178 isp->working = 0;
1179 }
1180
1181 static irqreturn_t isp1301_irq(int irq, void *isp)
1182 {
1183 isp1301_defer_work(isp, WORK_UPDATE_OTG);
1184 return IRQ_HANDLED;
1185 }
1186
1187 static void isp1301_timer(unsigned long _isp)
1188 {
1189 isp1301_defer_work((void *)_isp, WORK_TIMER);
1190 }
1191
1192 /*-------------------------------------------------------------------------*/
1193
1194 static void isp1301_release(struct device *dev)
1195 {
1196 struct isp1301 *isp;
1197
1198 isp = dev_get_drvdata(dev);
1199
1200 /* FIXME -- not with a "new style" driver, it doesn't!! */
1201
1202 /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1203 if (isp->i2c_release)
1204 isp->i2c_release(dev);
1205 kfree(isp->phy.otg);
1206 kfree (isp);
1207 }
1208
1209 static struct isp1301 *the_transceiver;
1210
1211 static int isp1301_remove(struct i2c_client *i2c)
1212 {
1213 struct isp1301 *isp;
1214
1215 isp = i2c_get_clientdata(i2c);
1216
1217 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1218 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1219 free_irq(i2c->irq, isp);
1220 #ifdef CONFIG_USB_OTG
1221 otg_unbind(isp);
1222 #endif
1223 if (machine_is_omap_h2())
1224 gpio_free(2);
1225
1226 isp->timer.data = 0;
1227 set_bit(WORK_STOP, &isp->todo);
1228 del_timer_sync(&isp->timer);
1229 flush_work(&isp->work);
1230
1231 put_device(&i2c->dev);
1232 the_transceiver = NULL;
1233
1234 return 0;
1235 }
1236
1237 /*-------------------------------------------------------------------------*/
1238
1239 /* NOTE: three modes are possible here, only one of which
1240 * will be standards-conformant on any given system:
1241 *
1242 * - OTG mode (dual-role), required if there's a Mini-AB connector
1243 * - HOST mode, for when there's one or more A (host) connectors
1244 * - DEVICE mode, for when there's a B/Mini-B (device) connector
1245 *
1246 * As a rule, you won't have an isp1301 chip unless it's there to
1247 * support the OTG mode. Other modes help testing USB controllers
1248 * in isolation from (full) OTG support, or maybe so later board
1249 * revisions can help to support those feature.
1250 */
1251
1252 #ifdef CONFIG_USB_OTG
1253
1254 static int isp1301_otg_enable(struct isp1301 *isp)
1255 {
1256 power_up(isp);
1257 isp1301_otg_init(isp);
1258
1259 /* NOTE: since we don't change this, this provides
1260 * a few more interrupts than are strictly needed.
1261 */
1262 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1263 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1264 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1265 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1266
1267 dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1268
1269 return 0;
1270 }
1271
1272 #endif
1273
1274 /* add or disable the host device+driver */
1275 static int
1276 isp1301_set_host(struct usb_otg *otg, struct usb_bus *host)
1277 {
1278 struct isp1301 *isp = container_of(otg->phy, struct isp1301, phy);
1279
1280 if (isp != the_transceiver)
1281 return -ENODEV;
1282
1283 if (!host) {
1284 omap_writew(0, OTG_IRQ_EN);
1285 power_down(isp);
1286 otg->host = NULL;
1287 return 0;
1288 }
1289
1290 #ifdef CONFIG_USB_OTG
1291 otg->host = host;
1292 dev_dbg(&isp->client->dev, "registered host\n");
1293 host_suspend(isp);
1294 if (otg->gadget)
1295 return isp1301_otg_enable(isp);
1296 return 0;
1297
1298 #elif !IS_ENABLED(CONFIG_USB_OMAP)
1299 // FIXME update its refcount
1300 otg->host = host;
1301
1302 power_up(isp);
1303
1304 if (machine_is_omap_h2())
1305 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1306
1307 dev_info(&isp->client->dev, "A-Host sessions ok\n");
1308 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1309 INTR_ID_GND);
1310 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1311 INTR_ID_GND);
1312
1313 /* If this has a Mini-AB connector, this mode is highly
1314 * nonstandard ... but can be handy for testing, especially with
1315 * the Mini-A end of an OTG cable. (Or something nonstandard
1316 * like MiniB-to-StandardB, maybe built with a gender mender.)
1317 */
1318 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1319
1320 dump_regs(isp, __func__);
1321
1322 return 0;
1323
1324 #else
1325 dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1326 return -EINVAL;
1327 #endif
1328
1329 }
1330
1331 static int
1332 isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
1333 {
1334 struct isp1301 *isp = container_of(otg->phy, struct isp1301, phy);
1335
1336 if (isp != the_transceiver)
1337 return -ENODEV;
1338
1339 if (!gadget) {
1340 omap_writew(0, OTG_IRQ_EN);
1341 if (!otg->default_a)
1342 enable_vbus_draw(isp, 0);
1343 usb_gadget_vbus_disconnect(otg->gadget);
1344 otg->gadget = NULL;
1345 power_down(isp);
1346 return 0;
1347 }
1348
1349 #ifdef CONFIG_USB_OTG
1350 otg->gadget = gadget;
1351 dev_dbg(&isp->client->dev, "registered gadget\n");
1352 /* gadget driver may be suspended until vbus_connect () */
1353 if (otg->host)
1354 return isp1301_otg_enable(isp);
1355 return 0;
1356
1357 #elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1358 otg->gadget = gadget;
1359 // FIXME update its refcount
1360
1361 {
1362 u32 l;
1363
1364 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1365 l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1366 l |= OTG_ID;
1367 omap_writel(l, OTG_CTRL);
1368 }
1369
1370 power_up(isp);
1371 isp->phy.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
1402 isp1301_set_power(struct usb_phy *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
1412 isp1301_start_srp(struct usb_otg *otg)
1413 {
1414 struct isp1301 *isp = container_of(otg->phy, struct isp1301, phy);
1415 u32 otg_ctrl;
1416
1417 if (isp != the_transceiver || isp->phy.state != OTG_STATE_B_IDLE)
1418 return -ENODEV;
1419
1420 otg_ctrl = omap_readl(OTG_CTRL);
1421 if (!(otg_ctrl & OTG_BSESSEND))
1422 return -EINVAL;
1423
1424 otg_ctrl |= OTG_B_BUSREQ;
1425 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1426 omap_writel(otg_ctrl, OTG_CTRL);
1427 isp->phy.state = OTG_STATE_B_SRP_INIT;
1428
1429 pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1430 omap_readl(OTG_CTRL));
1431 #ifdef CONFIG_USB_OTG
1432 check_state(isp, __func__);
1433 #endif
1434 return 0;
1435 }
1436
1437 static int
1438 isp1301_start_hnp(struct usb_otg *otg)
1439 {
1440 #ifdef CONFIG_USB_OTG
1441 struct isp1301 *isp = container_of(otg->phy, struct isp1301, phy);
1442 u32 l;
1443
1444 if (isp != the_transceiver)
1445 return -ENODEV;
1446 if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable))
1447 return -ENOTCONN;
1448 if (!otg->default_a && (otg->gadget == NULL
1449 || !otg->gadget->b_hnp_enable))
1450 return -ENOTCONN;
1451
1452 /* We want hardware to manage most HNP protocol timings.
1453 * So do this part as early as possible...
1454 */
1455 switch (isp->phy.state) {
1456 case OTG_STATE_B_HOST:
1457 isp->phy.state = OTG_STATE_B_PERIPHERAL;
1458 /* caller will suspend next */
1459 break;
1460 case OTG_STATE_A_HOST:
1461 #if 0
1462 /* autoconnect mode avoids irq latency bugs */
1463 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1464 MC1_BDIS_ACON_EN);
1465 #endif
1466 /* caller must suspend then clear A_BUSREQ */
1467 usb_gadget_vbus_connect(otg->gadget);
1468 l = omap_readl(OTG_CTRL);
1469 l |= OTG_A_SETB_HNPEN;
1470 omap_writel(l, OTG_CTRL);
1471
1472 break;
1473 case OTG_STATE_A_PERIPHERAL:
1474 /* initiated by B-Host suspend */
1475 break;
1476 default:
1477 return -EILSEQ;
1478 }
1479 pr_debug("otg: HNP %s, %06x ...\n",
1480 state_name(isp), omap_readl(OTG_CTRL));
1481 check_state(isp, __func__);
1482 return 0;
1483 #else
1484 /* srp-only */
1485 return -EINVAL;
1486 #endif
1487 }
1488
1489 /*-------------------------------------------------------------------------*/
1490
1491 static int
1492 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1493 {
1494 int status;
1495 struct isp1301 *isp;
1496
1497 if (the_transceiver)
1498 return 0;
1499
1500 isp = kzalloc(sizeof *isp, GFP_KERNEL);
1501 if (!isp)
1502 return 0;
1503
1504 isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL);
1505 if (!isp->phy.otg) {
1506 kfree(isp);
1507 return 0;
1508 }
1509
1510 INIT_WORK(&isp->work, isp1301_work);
1511 init_timer(&isp->timer);
1512 isp->timer.function = isp1301_timer;
1513 isp->timer.data = (unsigned long) isp;
1514
1515 i2c_set_clientdata(i2c, isp);
1516 isp->client = i2c;
1517
1518 /* verify the chip (shouldn't be necessary) */
1519 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1520 if (status != I2C_VENDOR_ID_PHILIPS) {
1521 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1522 goto fail;
1523 }
1524 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1525 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1526 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1527 goto fail;
1528 }
1529 isp->i2c_release = i2c->dev.release;
1530 i2c->dev.release = isp1301_release;
1531
1532 /* initial development used chiprev 2.00 */
1533 status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1534 dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1535 status >> 8, status & 0xff);
1536
1537 /* make like power-on reset */
1538 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1539
1540 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1541 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1542
1543 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1544 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1545 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1546 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1547
1548 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1549 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1550 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1551
1552 #ifdef CONFIG_USB_OTG
1553 status = otg_bind(isp);
1554 if (status < 0) {
1555 dev_dbg(&i2c->dev, "can't bind OTG\n");
1556 goto fail;
1557 }
1558 #endif
1559
1560 if (machine_is_omap_h2()) {
1561 /* full speed signaling by default */
1562 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1563 MC1_SPEED);
1564 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1565 MC2_SPD_SUSP_CTRL);
1566
1567 /* IRQ wired at M14 */
1568 omap_cfg_reg(M14_1510_GPIO2);
1569 if (gpio_request(2, "isp1301") == 0)
1570 gpio_direction_input(2);
1571 isp->irq_type = IRQF_TRIGGER_FALLING;
1572 }
1573
1574 status = request_irq(i2c->irq, isp1301_irq,
1575 isp->irq_type, DRIVER_NAME, isp);
1576 if (status < 0) {
1577 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1578 i2c->irq, status);
1579 goto fail;
1580 }
1581
1582 isp->phy.dev = &i2c->dev;
1583 isp->phy.label = DRIVER_NAME;
1584 isp->phy.set_power = isp1301_set_power,
1585
1586 isp->phy.otg->phy = &isp->phy;
1587 isp->phy.otg->set_host = isp1301_set_host,
1588 isp->phy.otg->set_peripheral = isp1301_set_peripheral,
1589 isp->phy.otg->start_srp = isp1301_start_srp,
1590 isp->phy.otg->start_hnp = isp1301_start_hnp,
1591
1592 enable_vbus_draw(isp, 0);
1593 power_down(isp);
1594 the_transceiver = isp;
1595
1596 #ifdef CONFIG_USB_OTG
1597 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1598 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1599 #endif
1600
1601 dump_regs(isp, __func__);
1602
1603 #ifdef VERBOSE
1604 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1605 dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1606 #endif
1607
1608 status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2);
1609 if (status < 0)
1610 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1611 status);
1612
1613 return 0;
1614
1615 fail:
1616 kfree(isp->phy.otg);
1617 kfree(isp);
1618 return -ENODEV;
1619 }
1620
1621 static const struct i2c_device_id isp1301_id[] = {
1622 { "isp1301_omap", 0 },
1623 { }
1624 };
1625 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1626
1627 static struct i2c_driver isp1301_driver = {
1628 .driver = {
1629 .name = "isp1301_omap",
1630 },
1631 .probe = isp1301_probe,
1632 .remove = isp1301_remove,
1633 .id_table = isp1301_id,
1634 };
1635
1636 /*-------------------------------------------------------------------------*/
1637
1638 static int __init isp_init(void)
1639 {
1640 return i2c_add_driver(&isp1301_driver);
1641 }
1642 subsys_initcall(isp_init);
1643
1644 static void __exit isp_exit(void)
1645 {
1646 if (the_transceiver)
1647 usb_remove_phy(&the_transceiver->phy);
1648 i2c_del_driver(&isp1301_driver);
1649 }
1650 module_exit(isp_exit);
1651
Linux kernel - Deliverables
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