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[CONNECTOR]: Initialize subsystem earlier.
[linux-2.6/verdex.git] / drivers / i2c / chips / isp1301_omap.c
blobe6f1ab7b913c1d59db9c7e6e7e98b3920927ea21
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 #undef DEBUG
22 #undef VERBOSE
23
24 #include <linux/config.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/interrupt.h>
30 #include <linux/platform_device.h>
31 #include <linux/usb_ch9.h>
32 #include <linux/usb_gadget.h>
33 #include <linux/usb.h>
34 #include <linux/usb_otg.h>
35 #include <linux/i2c.h>
36 #include <linux/workqueue.h>
37
38 #include <asm/irq.h>
39 #include <asm/arch/usb.h>
40
41
42 #ifndef DEBUG
43 #undef VERBOSE
44 #endif
45
46
47 #define DRIVER_VERSION "24 August 2004"
48 #define DRIVER_NAME (isp1301_driver.name)
49
50 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
51 MODULE_LICENSE("GPL");
52
53 struct isp1301 {
54 struct otg_transceiver otg;
55 struct i2c_client client;
56 void (*i2c_release)(struct device *dev);
57
58 int irq;
59
60 u32 last_otg_ctrl;
61 unsigned working:1;
62
63 struct timer_list timer;
64
65 /* use keventd context to change the state for us */
66 struct work_struct work;
67
68 unsigned long todo;
69 # define WORK_UPDATE_ISP 0 /* update ISP from OTG */
70 # define WORK_UPDATE_OTG 1 /* update OTG from ISP */
71 # define WORK_HOST_RESUME 4 /* resume host */
72 # define WORK_TIMER 6 /* timer fired */
73 # define WORK_STOP 7 /* don't resubmit */
74 };
75
76
77 /* bits in OTG_CTRL_REG */
78
79 #define OTG_XCEIV_OUTPUTS \
80 (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
81 #define OTG_XCEIV_INPUTS \
82 (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
83 #define OTG_CTRL_BITS \
84 (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
85 /* and OTG_PULLUP is sometimes written */
86
87 #define OTG_CTRL_MASK (OTG_DRIVER_SEL| \
88 OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
89 OTG_CTRL_BITS)
90
91
92 /*-------------------------------------------------------------------------*/
93
94 #ifdef CONFIG_MACH_OMAP_H2
95
96 /* board-specific PM hooks */
97
98 #include <asm/arch/gpio.h>
99 #include <asm/arch/mux.h>
100 #include <asm/mach-types.h>
101
102
103 #if defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
104
105 #include <asm/arch/tps65010.h>
106
107 #else
108
109 static inline int tps65010_set_vbus_draw(unsigned mA)
110 {
111 pr_debug("tps65010: draw %d mA (STUB)\n", mA);
112 return 0;
113 }
114
115 #endif
116
117 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
118 {
119 int status = tps65010_set_vbus_draw(mA);
120 if (status < 0)
121 pr_debug(" VBUS %d mA error %d\n", mA, status);
122 }
123
124 static void enable_vbus_source(struct isp1301 *isp)
125 {
126 /* this board won't supply more than 8mA vbus power.
127 * some boards can switch a 100ma "unit load" (or more).
128 */
129 }
130
131
132 /* products will deliver OTG messages with LEDs, GUI, etc */
133 static inline void notresponding(struct isp1301 *isp)
134 {
135 printk(KERN_NOTICE "OTG device not responding.\n");
136 }
137
138
139 #endif
140
141 /*-------------------------------------------------------------------------*/
142
143 /* only two addresses possible */
144 #define ISP_BASE 0x2c
145 static unsigned short normal_i2c[] = {
146 ISP_BASE, ISP_BASE + 1,
147 I2C_CLIENT_END };
148
149 I2C_CLIENT_INSMOD;
150
151 static struct i2c_driver isp1301_driver;
152
153 /* smbus apis are used for portability */
154
155 static inline u8
156 isp1301_get_u8(struct isp1301 *isp, u8 reg)
157 {
158 return i2c_smbus_read_byte_data(&isp->client, reg + 0);
159 }
160
161 static inline int
162 isp1301_get_u16(struct isp1301 *isp, u8 reg)
163 {
164 return i2c_smbus_read_word_data(&isp->client, reg);
165 }
166
167 static inline int
168 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
169 {
170 return i2c_smbus_write_byte_data(&isp->client, reg + 0, bits);
171 }
172
173 static inline int
174 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
175 {
176 return i2c_smbus_write_byte_data(&isp->client, reg + 1, bits);
177 }
178
179 /*-------------------------------------------------------------------------*/
180
181 /* identification */
182 #define ISP1301_VENDOR_ID 0x00 /* u16 read */
183 #define ISP1301_PRODUCT_ID 0x02 /* u16 read */
184 #define ISP1301_BCD_DEVICE 0x14 /* u16 read */
185
186 #define I2C_VENDOR_ID_PHILIPS 0x04cc
187 #define I2C_PRODUCT_ID_PHILIPS_1301 0x1301
188
189 /* operational registers */
190 #define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */
191 # define MC1_SPEED_REG (1 << 0)
192 # define MC1_SUSPEND_REG (1 << 1)
193 # define MC1_DAT_SE0 (1 << 2)
194 # define MC1_TRANSPARENT (1 << 3)
195 # define MC1_BDIS_ACON_EN (1 << 4)
196 # define MC1_OE_INT_EN (1 << 5)
197 # define MC1_UART_EN (1 << 6)
198 # define MC1_MASK 0x7f
199 #define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */
200 # define MC2_GLOBAL_PWR_DN (1 << 0)
201 # define MC2_SPD_SUSP_CTRL (1 << 1)
202 # define MC2_BI_DI (1 << 2)
203 # define MC2_TRANSP_BDIR0 (1 << 3)
204 # define MC2_TRANSP_BDIR1 (1 << 4)
205 # define MC2_AUDIO_EN (1 << 5)
206 # define MC2_PSW_EN (1 << 6)
207 # define MC2_EN2V7 (1 << 7)
208 #define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */
209 # define OTG1_DP_PULLUP (1 << 0)
210 # define OTG1_DM_PULLUP (1 << 1)
211 # define OTG1_DP_PULLDOWN (1 << 2)
212 # define OTG1_DM_PULLDOWN (1 << 3)
213 # define OTG1_ID_PULLDOWN (1 << 4)
214 # define OTG1_VBUS_DRV (1 << 5)
215 # define OTG1_VBUS_DISCHRG (1 << 6)
216 # define OTG1_VBUS_CHRG (1 << 7)
217 #define ISP1301_OTG_STATUS 0x10 /* u8 readonly */
218 # define OTG_B_SESS_END (1 << 6)
219 # define OTG_B_SESS_VLD (1 << 7)
220
221 #define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */
222 #define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */
223
224 #define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */
225 #define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */
226
227 /* same bitfields in all interrupt registers */
228 # define INTR_VBUS_VLD (1 << 0)
229 # define INTR_SESS_VLD (1 << 1)
230 # define INTR_DP_HI (1 << 2)
231 # define INTR_ID_GND (1 << 3)
232 # define INTR_DM_HI (1 << 4)
233 # define INTR_ID_FLOAT (1 << 5)
234 # define INTR_BDIS_ACON (1 << 6)
235 # define INTR_CR_INT (1 << 7)
236
237 /*-------------------------------------------------------------------------*/
238
239 static const char *state_string(enum usb_otg_state state)
240 {
241 switch (state) {
242 case OTG_STATE_A_IDLE: return "a_idle";
243 case OTG_STATE_A_WAIT_VRISE: return "a_wait_vrise";
244 case OTG_STATE_A_WAIT_BCON: return "a_wait_bcon";
245 case OTG_STATE_A_HOST: return "a_host";
246 case OTG_STATE_A_SUSPEND: return "a_suspend";
247 case OTG_STATE_A_PERIPHERAL: return "a_peripheral";
248 case OTG_STATE_A_WAIT_VFALL: return "a_wait_vfall";
249 case OTG_STATE_A_VBUS_ERR: return "a_vbus_err";
250 case OTG_STATE_B_IDLE: return "b_idle";
251 case OTG_STATE_B_SRP_INIT: return "b_srp_init";
252 case OTG_STATE_B_PERIPHERAL: return "b_peripheral";
253 case OTG_STATE_B_WAIT_ACON: return "b_wait_acon";
254 case OTG_STATE_B_HOST: return "b_host";
255 default: return "UNDEFINED";
256 }
257 }
258
259 static inline const char *state_name(struct isp1301 *isp)
260 {
261 return state_string(isp->otg.state);
262 }
263
264 #ifdef VERBOSE
265 #define dev_vdbg dev_dbg
266 #else
267 #define dev_vdbg(dev, fmt, arg...) do{}while(0)
268 #endif
269
270 /*-------------------------------------------------------------------------*/
271
272 /* NOTE: some of this ISP1301 setup is specific to H2 boards;
273 * not everything is guarded by board-specific checks, or even using
274 * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
275 *
276 * ALSO: this currently doesn't use ISP1301 low-power modes
277 * while OTG is running.
278 */
279
280 static void power_down(struct isp1301 *isp)
281 {
282 isp->otg.state = OTG_STATE_UNDEFINED;
283
284 // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
285 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
286
287 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
288 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
289 }
290
291 static void power_up(struct isp1301 *isp)
292 {
293 // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
294 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
295
296 /* do this only when cpu is driving transceiver,
297 * so host won't see a low speed device...
298 */
299 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
300 }
301
302 #define NO_HOST_SUSPEND
303
304 static int host_suspend(struct isp1301 *isp)
305 {
306 #ifdef NO_HOST_SUSPEND
307 return 0;
308 #else
309 struct device *dev;
310
311 if (!isp->otg.host)
312 return -ENODEV;
313
314 /* Currently ASSUMES only the OTG port matters;
315 * other ports could be active...
316 */
317 dev = isp->otg.host->controller;
318 return dev->driver->suspend(dev, 3, 0);
319 #endif
320 }
321
322 static int host_resume(struct isp1301 *isp)
323 {
324 #ifdef NO_HOST_SUSPEND
325 return 0;
326 #else
327 struct device *dev;
328
329 if (!isp->otg.host)
330 return -ENODEV;
331
332 dev = isp->otg.host->controller;
333 return dev->driver->resume(dev, 0);
334 #endif
335 }
336
337 static int gadget_suspend(struct isp1301 *isp)
338 {
339 isp->otg.gadget->b_hnp_enable = 0;
340 isp->otg.gadget->a_hnp_support = 0;
341 isp->otg.gadget->a_alt_hnp_support = 0;
342 return usb_gadget_vbus_disconnect(isp->otg.gadget);
343 }
344
345 /*-------------------------------------------------------------------------*/
346
347 #define TIMER_MINUTES 10
348 #define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ)
349
350 /* Almost all our I2C messaging comes from a work queue's task context.
351 * NOTE: guaranteeing certain response times might mean we shouldn't
352 * share keventd's work queue; a realtime task might be safest.
353 */
354 void
355 isp1301_defer_work(struct isp1301 *isp, int work)
356 {
357 int status;
358
359 if (isp && !test_and_set_bit(work, &isp->todo)) {
360 (void) get_device(&isp->client.dev);
361 status = schedule_work(&isp->work);
362 if (!status && !isp->working)
363 dev_vdbg(&isp->client.dev,
364 "work item %d may be lost\n", work);
365 }
366 }
367
368 /* called from irq handlers */
369 static void a_idle(struct isp1301 *isp, const char *tag)
370 {
371 if (isp->otg.state == OTG_STATE_A_IDLE)
372 return;
373
374 isp->otg.default_a = 1;
375 if (isp->otg.host) {
376 isp->otg.host->is_b_host = 0;
377 host_suspend(isp);
378 }
379 if (isp->otg.gadget) {
380 isp->otg.gadget->is_a_peripheral = 1;
381 gadget_suspend(isp);
382 }
383 isp->otg.state = OTG_STATE_A_IDLE;
384 isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
385 pr_debug(" --> %s/%s\n", state_name(isp), tag);
386 }
387
388 /* called from irq handlers */
389 static void b_idle(struct isp1301 *isp, const char *tag)
390 {
391 if (isp->otg.state == OTG_STATE_B_IDLE)
392 return;
393
394 isp->otg.default_a = 0;
395 if (isp->otg.host) {
396 isp->otg.host->is_b_host = 1;
397 host_suspend(isp);
398 }
399 if (isp->otg.gadget) {
400 isp->otg.gadget->is_a_peripheral = 0;
401 gadget_suspend(isp);
402 }
403 isp->otg.state = OTG_STATE_B_IDLE;
404 isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
405 pr_debug(" --> %s/%s\n", state_name(isp), tag);
406 }
407
408 static void
409 dump_regs(struct isp1301 *isp, const char *label)
410 {
411 #ifdef DEBUG
412 u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
413 u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
414 u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
415
416 pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
417 OTG_CTRL_REG, label, state_name(isp),
418 ctrl, status, src);
419 /* mode control and irq enables don't change much */
420 #endif
421 }
422
423 /*-------------------------------------------------------------------------*/
424
425 #ifdef CONFIG_USB_OTG
426
427 /*
428 * The OMAP OTG controller handles most of the OTG state transitions.
429 *
430 * We translate isp1301 outputs (mostly voltage comparator status) into
431 * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
432 * flags into isp1301 inputs ... and infer state transitions.
433 */
434
435 #ifdef VERBOSE
436
437 static void check_state(struct isp1301 *isp, const char *tag)
438 {
439 enum usb_otg_state state = OTG_STATE_UNDEFINED;
440 u8 fsm = OTG_TEST_REG & 0x0ff;
441 unsigned extra = 0;
442
443 switch (fsm) {
444
445 /* default-b */
446 case 0x0:
447 state = OTG_STATE_B_IDLE;
448 break;
449 case 0x3:
450 case 0x7:
451 extra = 1;
452 case 0x1:
453 state = OTG_STATE_B_PERIPHERAL;
454 break;
455 case 0x11:
456 state = OTG_STATE_B_SRP_INIT;
457 break;
458
459 /* extra dual-role default-b states */
460 case 0x12:
461 case 0x13:
462 case 0x16:
463 extra = 1;
464 case 0x17:
465 state = OTG_STATE_B_WAIT_ACON;
466 break;
467 case 0x34:
468 state = OTG_STATE_B_HOST;
469 break;
470
471 /* default-a */
472 case 0x36:
473 state = OTG_STATE_A_IDLE;
474 break;
475 case 0x3c:
476 state = OTG_STATE_A_WAIT_VFALL;
477 break;
478 case 0x7d:
479 state = OTG_STATE_A_VBUS_ERR;
480 break;
481 case 0x9e:
482 case 0x9f:
483 extra = 1;
484 case 0x89:
485 state = OTG_STATE_A_PERIPHERAL;
486 break;
487 case 0xb7:
488 state = OTG_STATE_A_WAIT_VRISE;
489 break;
490 case 0xb8:
491 state = OTG_STATE_A_WAIT_BCON;
492 break;
493 case 0xb9:
494 state = OTG_STATE_A_HOST;
495 break;
496 case 0xba:
497 state = OTG_STATE_A_SUSPEND;
498 break;
499 default:
500 break;
501 }
502 if (isp->otg.state == state && !extra)
503 return;
504 pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
505 state_string(state), fsm, state_name(isp), OTG_CTRL_REG);
506 }
507
508 #else
509
510 static inline void check_state(struct isp1301 *isp, const char *tag) { }
511
512 #endif
513
514 /* outputs from ISP1301_INTERRUPT_SOURCE */
515 static void update_otg1(struct isp1301 *isp, u8 int_src)
516 {
517 u32 otg_ctrl;
518
519 otg_ctrl = OTG_CTRL_REG
520 & OTG_CTRL_MASK
521 & ~OTG_XCEIV_INPUTS
522 & ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
523 if (int_src & INTR_SESS_VLD)
524 otg_ctrl |= OTG_ASESSVLD;
525 else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
526 a_idle(isp, "vfall");
527 otg_ctrl &= ~OTG_CTRL_BITS;
528 }
529 if (int_src & INTR_VBUS_VLD)
530 otg_ctrl |= OTG_VBUSVLD;
531 if (int_src & INTR_ID_GND) { /* default-A */
532 if (isp->otg.state == OTG_STATE_B_IDLE
533 || isp->otg.state == OTG_STATE_UNDEFINED) {
534 a_idle(isp, "init");
535 return;
536 }
537 } else { /* default-B */
538 otg_ctrl |= OTG_ID;
539 if (isp->otg.state == OTG_STATE_A_IDLE
540 || isp->otg.state == OTG_STATE_UNDEFINED) {
541 b_idle(isp, "init");
542 return;
543 }
544 }
545 OTG_CTRL_REG = otg_ctrl;
546 }
547
548 /* outputs from ISP1301_OTG_STATUS */
549 static void update_otg2(struct isp1301 *isp, u8 otg_status)
550 {
551 u32 otg_ctrl;
552
553 otg_ctrl = OTG_CTRL_REG
554 & OTG_CTRL_MASK
555 & ~OTG_XCEIV_INPUTS
556 & ~(OTG_BSESSVLD|OTG_BSESSEND);
557 if (otg_status & OTG_B_SESS_VLD)
558 otg_ctrl |= OTG_BSESSVLD;
559 else if (otg_status & OTG_B_SESS_END)
560 otg_ctrl |= OTG_BSESSEND;
561 OTG_CTRL_REG = otg_ctrl;
562 }
563
564 /* inputs going to ISP1301 */
565 static void otg_update_isp(struct isp1301 *isp)
566 {
567 u32 otg_ctrl, otg_change;
568 u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
569
570 otg_ctrl = OTG_CTRL_REG;
571 otg_change = otg_ctrl ^ isp->last_otg_ctrl;
572 isp->last_otg_ctrl = otg_ctrl;
573 otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
574
575 switch (isp->otg.state) {
576 case OTG_STATE_B_IDLE:
577 case OTG_STATE_B_PERIPHERAL:
578 case OTG_STATE_B_SRP_INIT:
579 if (!(otg_ctrl & OTG_PULLUP)) {
580 // if (otg_ctrl & OTG_B_HNPEN) {
581 if (isp->otg.gadget->b_hnp_enable) {
582 isp->otg.state = OTG_STATE_B_WAIT_ACON;
583 pr_debug(" --> b_wait_acon\n");
584 }
585 goto pulldown;
586 }
587 pullup:
588 set |= OTG1_DP_PULLUP;
589 clr |= OTG1_DP_PULLDOWN;
590 break;
591 case OTG_STATE_A_SUSPEND:
592 case OTG_STATE_A_PERIPHERAL:
593 if (otg_ctrl & OTG_PULLUP)
594 goto pullup;
595 /* FALLTHROUGH */
596 // case OTG_STATE_B_WAIT_ACON:
597 default:
598 pulldown:
599 set |= OTG1_DP_PULLDOWN;
600 clr |= OTG1_DP_PULLUP;
601 break;
602 }
603
604 # define toggle(OTG,ISP) do { \
605 if (otg_ctrl & OTG) set |= ISP; \
606 else clr |= ISP; \
607 } while (0)
608
609 if (!(isp->otg.host))
610 otg_ctrl &= ~OTG_DRV_VBUS;
611
612 switch (isp->otg.state) {
613 case OTG_STATE_A_SUSPEND:
614 if (otg_ctrl & OTG_DRV_VBUS) {
615 set |= OTG1_VBUS_DRV;
616 break;
617 }
618 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
619 notresponding(isp);
620
621 /* FALLTHROUGH */
622 case OTG_STATE_A_VBUS_ERR:
623 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
624 pr_debug(" --> a_wait_vfall\n");
625 /* FALLTHROUGH */
626 case OTG_STATE_A_WAIT_VFALL:
627 /* FIXME usbcore thinks port power is still on ... */
628 clr |= OTG1_VBUS_DRV;
629 break;
630 case OTG_STATE_A_IDLE:
631 if (otg_ctrl & OTG_DRV_VBUS) {
632 isp->otg.state = OTG_STATE_A_WAIT_VRISE;
633 pr_debug(" --> a_wait_vrise\n");
634 }
635 /* FALLTHROUGH */
636 default:
637 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
638 }
639
640 toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
641 toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
642
643 # undef toggle
644
645 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
646 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
647
648 /* HNP switch to host or peripheral; and SRP */
649 if (otg_change & OTG_PULLUP) {
650 switch (isp->otg.state) {
651 case OTG_STATE_B_IDLE:
652 if (clr & OTG1_DP_PULLUP)
653 break;
654 isp->otg.state = OTG_STATE_B_PERIPHERAL;
655 pr_debug(" --> b_peripheral\n");
656 break;
657 case OTG_STATE_A_SUSPEND:
658 if (clr & OTG1_DP_PULLUP)
659 break;
660 isp->otg.state = OTG_STATE_A_PERIPHERAL;
661 pr_debug(" --> a_peripheral\n");
662 break;
663 default:
664 break;
665 }
666 OTG_CTRL_REG |= OTG_PULLUP;
667 }
668
669 check_state(isp, __FUNCTION__);
670 dump_regs(isp, "otg->isp1301");
671 }
672
673 static irqreturn_t omap_otg_irq(int irq, void *_isp, struct pt_regs *regs)
674 {
675 u16 otg_irq = OTG_IRQ_SRC_REG;
676 u32 otg_ctrl;
677 int ret = IRQ_NONE;
678 struct isp1301 *isp = _isp;
679
680 /* update ISP1301 transciever from OTG controller */
681 if (otg_irq & OPRT_CHG) {
682 OTG_IRQ_SRC_REG = OPRT_CHG;
683 isp1301_defer_work(isp, WORK_UPDATE_ISP);
684 ret = IRQ_HANDLED;
685
686 /* SRP to become b_peripheral failed */
687 } else if (otg_irq & B_SRP_TMROUT) {
688 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", OTG_CTRL_REG);
689 notresponding(isp);
690
691 /* gadget drivers that care should monitor all kinds of
692 * remote wakeup (SRP, normal) using their own timer
693 * to give "check cable and A-device" messages.
694 */
695 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
696 b_idle(isp, "srp_timeout");
697
698 OTG_IRQ_SRC_REG = B_SRP_TMROUT;
699 ret = IRQ_HANDLED;
700
701 /* HNP to become b_host failed */
702 } else if (otg_irq & B_HNP_FAIL) {
703 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
704 state_name(isp), OTG_CTRL_REG);
705 notresponding(isp);
706
707 otg_ctrl = OTG_CTRL_REG;
708 otg_ctrl |= OTG_BUSDROP;
709 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
710 OTG_CTRL_REG = otg_ctrl;
711
712 /* subset of b_peripheral()... */
713 isp->otg.state = OTG_STATE_B_PERIPHERAL;
714 pr_debug(" --> b_peripheral\n");
715
716 OTG_IRQ_SRC_REG = B_HNP_FAIL;
717 ret = IRQ_HANDLED;
718
719 /* detect SRP from B-device ... */
720 } else if (otg_irq & A_SRP_DETECT) {
721 pr_debug("otg: %s SRP_DETECT, %06x\n",
722 state_name(isp), OTG_CTRL_REG);
723
724 isp1301_defer_work(isp, WORK_UPDATE_OTG);
725 switch (isp->otg.state) {
726 case OTG_STATE_A_IDLE:
727 if (!isp->otg.host)
728 break;
729 isp1301_defer_work(isp, WORK_HOST_RESUME);
730 otg_ctrl = OTG_CTRL_REG;
731 otg_ctrl |= OTG_A_BUSREQ;
732 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
733 & ~OTG_XCEIV_INPUTS
734 & OTG_CTRL_MASK;
735 OTG_CTRL_REG = otg_ctrl;
736 break;
737 default:
738 break;
739 }
740
741 OTG_IRQ_SRC_REG = A_SRP_DETECT;
742 ret = IRQ_HANDLED;
743
744 /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise)
745 * we don't track them separately
746 */
747 } else if (otg_irq & A_REQ_TMROUT) {
748 otg_ctrl = OTG_CTRL_REG;
749 pr_info("otg: BCON_TMOUT from %s, %06x\n",
750 state_name(isp), otg_ctrl);
751 notresponding(isp);
752
753 otg_ctrl |= OTG_BUSDROP;
754 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
755 OTG_CTRL_REG = otg_ctrl;
756 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
757
758 OTG_IRQ_SRC_REG = A_REQ_TMROUT;
759 ret = IRQ_HANDLED;
760
761 /* A-supplied voltage fell too low; overcurrent */
762 } else if (otg_irq & A_VBUS_ERR) {
763 otg_ctrl = OTG_CTRL_REG;
764 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
765 state_name(isp), otg_irq, otg_ctrl);
766
767 otg_ctrl |= OTG_BUSDROP;
768 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
769 OTG_CTRL_REG = otg_ctrl;
770 isp->otg.state = OTG_STATE_A_VBUS_ERR;
771
772 OTG_IRQ_SRC_REG = A_VBUS_ERR;
773 ret = IRQ_HANDLED;
774
775 /* switch driver; the transciever code activates it,
776 * ungating the udc clock or resuming OHCI.
777 */
778 } else if (otg_irq & DRIVER_SWITCH) {
779 int kick = 0;
780
781 otg_ctrl = OTG_CTRL_REG;
782 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
783 state_name(isp),
784 (otg_ctrl & OTG_DRIVER_SEL)
785 ? "gadget" : "host",
786 otg_ctrl);
787 isp1301_defer_work(isp, WORK_UPDATE_ISP);
788
789 /* role is peripheral */
790 if (otg_ctrl & OTG_DRIVER_SEL) {
791 switch (isp->otg.state) {
792 case OTG_STATE_A_IDLE:
793 b_idle(isp, __FUNCTION__);
794 break;
795 default:
796 break;
797 }
798 isp1301_defer_work(isp, WORK_UPDATE_ISP);
799
800 /* role is host */
801 } else {
802 if (!(otg_ctrl & OTG_ID)) {
803 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
804 OTG_CTRL_REG = otg_ctrl | OTG_A_BUSREQ;
805 }
806
807 if (isp->otg.host) {
808 switch (isp->otg.state) {
809 case OTG_STATE_B_WAIT_ACON:
810 isp->otg.state = OTG_STATE_B_HOST;
811 pr_debug(" --> b_host\n");
812 kick = 1;
813 break;
814 case OTG_STATE_A_WAIT_BCON:
815 isp->otg.state = OTG_STATE_A_HOST;
816 pr_debug(" --> a_host\n");
817 break;
818 case OTG_STATE_A_PERIPHERAL:
819 isp->otg.state = OTG_STATE_A_WAIT_BCON;
820 pr_debug(" --> a_wait_bcon\n");
821 break;
822 default:
823 break;
824 }
825 isp1301_defer_work(isp, WORK_HOST_RESUME);
826 }
827 }
828
829 OTG_IRQ_SRC_REG = DRIVER_SWITCH;
830 ret = IRQ_HANDLED;
831
832 if (kick)
833 usb_bus_start_enum(isp->otg.host,
834 isp->otg.host->otg_port);
835 }
836
837 check_state(isp, __FUNCTION__);
838 return ret;
839 }
840
841 static struct platform_device *otg_dev;
842
843 static int otg_init(struct isp1301 *isp)
844 {
845 if (!otg_dev)
846 return -ENODEV;
847
848 dump_regs(isp, __FUNCTION__);
849 /* some of these values are board-specific... */
850 OTG_SYSCON_2_REG |= OTG_EN
851 /* for B-device: */
852 | SRP_GPDATA /* 9msec Bdev D+ pulse */
853 | SRP_GPDVBUS /* discharge after VBUS pulse */
854 // | (3 << 24) /* 2msec VBUS pulse */
855 /* for A-device: */
856 | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */
857 | SRP_DPW /* detect 167+ns SRP pulses */
858 | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */
859 ;
860
861 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
862 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
863
864 check_state(isp, __FUNCTION__);
865 pr_debug("otg: %s, %s %06x\n",
866 state_name(isp), __FUNCTION__, OTG_CTRL_REG);
867
868 OTG_IRQ_EN_REG = DRIVER_SWITCH | OPRT_CHG
869 | B_SRP_TMROUT | B_HNP_FAIL
870 | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT;
871 OTG_SYSCON_2_REG |= OTG_EN;
872
873 return 0;
874 }
875
876 static int otg_probe(struct platform_device *dev)
877 {
878 // struct omap_usb_config *config = dev->platform_data;
879
880 otg_dev = dev;
881 return 0;
882 }
883
884 static int otg_remove(struct platform_device *dev)
885 {
886 otg_dev = 0;
887 return 0;
888 }
889
890 struct platform_driver omap_otg_driver = {
891 .probe = otg_probe,
892 .remove = otg_remove,
893 .driver = {
894 .owner = THIS_MODULE,
895 .name = "omap_otg",
896 },
897 };
898
899 static int otg_bind(struct isp1301 *isp)
900 {
901 int status;
902
903 if (otg_dev)
904 return -EBUSY;
905
906 status = platform_driver_register(&omap_otg_driver);
907 if (status < 0)
908 return status;
909
910 if (otg_dev)
911 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
912 SA_INTERRUPT, DRIVER_NAME, isp);
913 else
914 status = -ENODEV;
915
916 if (status < 0)
917 platform_driver_unregister(&omap_otg_driver);
918 return status;
919 }
920
921 static void otg_unbind(struct isp1301 *isp)
922 {
923 if (!otg_dev)
924 return;
925 free_irq(otg_dev->resource[1].start, isp);
926 }
927
928 #else
929
930 /* OTG controller isn't clocked */
931
932 #endif /* CONFIG_USB_OTG */
933
934 /*-------------------------------------------------------------------------*/
935
936 static void b_peripheral(struct isp1301 *isp)
937 {
938 OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
939 usb_gadget_vbus_connect(isp->otg.gadget);
940
941 #ifdef CONFIG_USB_OTG
942 enable_vbus_draw(isp, 8);
943 otg_update_isp(isp);
944 #else
945 enable_vbus_draw(isp, 100);
946 /* UDC driver just set OTG_BSESSVLD */
947 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
948 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
949 isp->otg.state = OTG_STATE_B_PERIPHERAL;
950 pr_debug(" --> b_peripheral\n");
951 dump_regs(isp, "2periph");
952 #endif
953 }
954
955 static void isp_update_otg(struct isp1301 *isp, u8 stat)
956 {
957 u8 isp_stat, isp_bstat;
958 enum usb_otg_state state = isp->otg.state;
959
960 if (stat & INTR_BDIS_ACON)
961 pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp));
962
963 /* start certain state transitions right away */
964 isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
965 if (isp_stat & INTR_ID_GND) {
966 if (isp->otg.default_a) {
967 switch (state) {
968 case OTG_STATE_B_IDLE:
969 a_idle(isp, "idle");
970 /* FALLTHROUGH */
971 case OTG_STATE_A_IDLE:
972 enable_vbus_source(isp);
973 /* FALLTHROUGH */
974 case OTG_STATE_A_WAIT_VRISE:
975 /* we skip over OTG_STATE_A_WAIT_BCON, since
976 * the HC will transition to A_HOST (or
977 * A_SUSPEND!) without our noticing except
978 * when HNP is used.
979 */
980 if (isp_stat & INTR_VBUS_VLD)
981 isp->otg.state = OTG_STATE_A_HOST;
982 break;
983 case OTG_STATE_A_WAIT_VFALL:
984 if (!(isp_stat & INTR_SESS_VLD))
985 a_idle(isp, "vfell");
986 break;
987 default:
988 if (!(isp_stat & INTR_VBUS_VLD))
989 isp->otg.state = OTG_STATE_A_VBUS_ERR;
990 break;
991 }
992 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
993 } else {
994 switch (state) {
995 case OTG_STATE_B_PERIPHERAL:
996 case OTG_STATE_B_HOST:
997 case OTG_STATE_B_WAIT_ACON:
998 usb_gadget_vbus_disconnect(isp->otg.gadget);
999 break;
1000 default:
1001 break;
1002 }
1003 if (state != OTG_STATE_A_IDLE)
1004 a_idle(isp, "id");
1005 if (isp->otg.host && state == OTG_STATE_A_IDLE)
1006 isp1301_defer_work(isp, WORK_HOST_RESUME);
1007 isp_bstat = 0;
1008 }
1009 } else {
1010 /* if user unplugged mini-A end of cable,
1011 * don't bypass A_WAIT_VFALL.
1012 */
1013 if (isp->otg.default_a) {
1014 switch (state) {
1015 default:
1016 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1017 break;
1018 case OTG_STATE_A_WAIT_VFALL:
1019 state = OTG_STATE_A_IDLE;
1020 /* khubd may take a while to notice and
1021 * handle this disconnect, so don't go
1022 * to B_IDLE quite yet.
1023 */
1024 break;
1025 case OTG_STATE_A_IDLE:
1026 host_suspend(isp);
1027 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1028 MC1_BDIS_ACON_EN);
1029 isp->otg.state = OTG_STATE_B_IDLE;
1030 OTG_CTRL_REG &= OTG_CTRL_REG & OTG_CTRL_MASK
1031 & ~OTG_CTRL_BITS;
1032 break;
1033 case OTG_STATE_B_IDLE:
1034 break;
1035 }
1036 }
1037 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1038
1039 switch (isp->otg.state) {
1040 case OTG_STATE_B_PERIPHERAL:
1041 case OTG_STATE_B_WAIT_ACON:
1042 case OTG_STATE_B_HOST:
1043 if (likely(isp_bstat & OTG_B_SESS_VLD))
1044 break;
1045 enable_vbus_draw(isp, 0);
1046 #ifndef CONFIG_USB_OTG
1047 /* UDC driver will clear OTG_BSESSVLD */
1048 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1049 OTG1_DP_PULLDOWN);
1050 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1051 OTG1_DP_PULLUP);
1052 dump_regs(isp, __FUNCTION__);
1053 #endif
1054 /* FALLTHROUGH */
1055 case OTG_STATE_B_SRP_INIT:
1056 b_idle(isp, __FUNCTION__);
1057 OTG_CTRL_REG &= OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
1058 /* FALLTHROUGH */
1059 case OTG_STATE_B_IDLE:
1060 if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1061 #ifdef CONFIG_USB_OTG
1062 update_otg1(isp, isp_stat);
1063 update_otg2(isp, isp_bstat);
1064 #endif
1065 b_peripheral(isp);
1066 } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1067 isp_bstat |= OTG_B_SESS_END;
1068 break;
1069 case OTG_STATE_A_WAIT_VFALL:
1070 break;
1071 default:
1072 pr_debug("otg: unsupported b-device %s\n",
1073 state_name(isp));
1074 break;
1075 }
1076 }
1077
1078 if (state != isp->otg.state)
1079 pr_debug(" isp, %s -> %s\n",
1080 state_string(state), state_name(isp));
1081
1082 #ifdef CONFIG_USB_OTG
1083 /* update the OTG controller state to match the isp1301; may
1084 * trigger OPRT_CHG irqs for changes going to the isp1301.
1085 */
1086 update_otg1(isp, isp_stat);
1087 update_otg2(isp, isp_bstat);
1088 check_state(isp, __FUNCTION__);
1089 #endif
1090
1091 dump_regs(isp, "isp1301->otg");
1092 }
1093
1094 /*-------------------------------------------------------------------------*/
1095
1096 static u8 isp1301_clear_latch(struct isp1301 *isp)
1097 {
1098 u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1099 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1100 return latch;
1101 }
1102
1103 static void
1104 isp1301_work(void *data)
1105 {
1106 struct isp1301 *isp = data;
1107 int stop;
1108
1109 /* implicit lock: we're the only task using this device */
1110 isp->working = 1;
1111 do {
1112 stop = test_bit(WORK_STOP, &isp->todo);
1113
1114 #ifdef CONFIG_USB_OTG
1115 /* transfer state from otg engine to isp1301 */
1116 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1117 otg_update_isp(isp);
1118 put_device(&isp->client.dev);
1119 }
1120 #endif
1121 /* transfer state from isp1301 to otg engine */
1122 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1123 u8 stat = isp1301_clear_latch(isp);
1124
1125 isp_update_otg(isp, stat);
1126 put_device(&isp->client.dev);
1127 }
1128
1129 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1130 u32 otg_ctrl;
1131
1132 /*
1133 * skip A_WAIT_VRISE; hc transitions invisibly
1134 * skip A_WAIT_BCON; same.
1135 */
1136 switch (isp->otg.state) {
1137 case OTG_STATE_A_WAIT_BCON:
1138 case OTG_STATE_A_WAIT_VRISE:
1139 isp->otg.state = OTG_STATE_A_HOST;
1140 pr_debug(" --> a_host\n");
1141 otg_ctrl = OTG_CTRL_REG;
1142 otg_ctrl |= OTG_A_BUSREQ;
1143 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1144 & OTG_CTRL_MASK;
1145 OTG_CTRL_REG = otg_ctrl;
1146 break;
1147 case OTG_STATE_B_WAIT_ACON:
1148 isp->otg.state = OTG_STATE_B_HOST;
1149 pr_debug(" --> b_host (acon)\n");
1150 break;
1151 case OTG_STATE_B_HOST:
1152 case OTG_STATE_B_IDLE:
1153 case OTG_STATE_A_IDLE:
1154 break;
1155 default:
1156 pr_debug(" host resume in %s\n",
1157 state_name(isp));
1158 }
1159 host_resume(isp);
1160 // mdelay(10);
1161 put_device(&isp->client.dev);
1162 }
1163
1164 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1165 #ifdef VERBOSE
1166 dump_regs(isp, "timer");
1167 if (!stop)
1168 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1169 #endif
1170 put_device(&isp->client.dev);
1171 }
1172
1173 if (isp->todo)
1174 dev_vdbg(&isp->client.dev,
1175 "work done, todo = 0x%lx\n",
1176 isp->todo);
1177 if (stop) {
1178 dev_dbg(&isp->client.dev, "stop\n");
1179 break;
1180 }
1181 } while (isp->todo);
1182 isp->working = 0;
1183 }
1184
1185 static irqreturn_t isp1301_irq(int irq, void *isp, struct pt_regs *regs)
1186 {
1187 isp1301_defer_work(isp, WORK_UPDATE_OTG);
1188 return IRQ_HANDLED;
1189 }
1190
1191 static void isp1301_timer(unsigned long _isp)
1192 {
1193 isp1301_defer_work((void *)_isp, WORK_TIMER);
1194 }
1195
1196 /*-------------------------------------------------------------------------*/
1197
1198 static void isp1301_release(struct device *dev)
1199 {
1200 struct isp1301 *isp;
1201
1202 isp = container_of(dev, struct isp1301, client.dev);
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
1212 static int isp1301_detach_client(struct i2c_client *i2c)
1213 {
1214 struct isp1301 *isp;
1215
1216 isp = container_of(i2c, struct isp1301, client);
1217
1218 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1219 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1220 free_irq(isp->irq, isp);
1221 #ifdef CONFIG_USB_OTG
1222 otg_unbind(isp);
1223 #endif
1224 if (machine_is_omap_h2())
1225 omap_free_gpio(2);
1226
1227 isp->timer.data = 0;
1228 set_bit(WORK_STOP, &isp->todo);
1229 del_timer_sync(&isp->timer);
1230 flush_scheduled_work();
1231
1232 put_device(&i2c->dev);
1233 the_transceiver = 0;
1234
1235 return i2c_detach_client(i2c);
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
1255 static int isp1301_otg_enable(struct isp1301 *isp)
1256 {
1257 power_up(isp);
1258 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
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 OTG_IRQ_EN_REG = 0;
1286 power_down(isp);
1287 isp->otg.host = 0;
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, __FUNCTION__);
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
1333 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1334 {
1335 struct isp1301 *isp = container_of(otg, struct isp1301, otg);
1336
1337 if (!otg || isp != the_transceiver)
1338 return -ENODEV;
1339
1340 if (!gadget) {
1341 OTG_IRQ_EN_REG = 0;
1342 if (!isp->otg.default_a)
1343 enable_vbus_draw(isp, 0);
1344 usb_gadget_vbus_disconnect(isp->otg.gadget);
1345 isp->otg.gadget = 0;
1346 power_down(isp);
1347 return 0;
1348 }
1349
1350 #ifdef CONFIG_USB_OTG
1351 isp->otg.gadget = gadget;
1352 dev_dbg(&isp->client.dev, "registered gadget\n");
1353 /* gadget driver may be suspended until vbus_connect () */
1354 if (isp->otg.host)
1355 return isp1301_otg_enable(isp);
1356 return 0;
1357
1358 #elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1359 isp->otg.gadget = gadget;
1360 // FIXME update its refcount
1361
1362 OTG_CTRL_REG = (OTG_CTRL_REG & OTG_CTRL_MASK
1363 & ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS))
1364 | OTG_ID;
1365 power_up(isp);
1366 isp->otg.state = OTG_STATE_B_IDLE;
1367
1368 if (machine_is_omap_h2())
1369 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1370
1371 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1372 INTR_SESS_VLD);
1373 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1374 INTR_VBUS_VLD);
1375 dev_info(&isp->client.dev, "B-Peripheral sessions ok\n");
1376 dump_regs(isp, __FUNCTION__);
1377
1378 /* If this has a Mini-AB connector, this mode is highly
1379 * nonstandard ... but can be handy for testing, so long
1380 * as you don't plug a Mini-A cable into the jack.
1381 */
1382 if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1383 b_peripheral(isp);
1384
1385 return 0;
1386
1387 #else
1388 dev_dbg(&isp->client.dev, "peripheral sessions not allowed\n");
1389 return -EINVAL;
1390 #endif
1391 }
1392
1393
1394 /*-------------------------------------------------------------------------*/
1395
1396 static int
1397 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1398 {
1399 if (!the_transceiver)
1400 return -ENODEV;
1401 if (dev->state == OTG_STATE_B_PERIPHERAL)
1402 enable_vbus_draw(the_transceiver, mA);
1403 return 0;
1404 }
1405
1406 static int
1407 isp1301_start_srp(struct otg_transceiver *dev)
1408 {
1409 struct isp1301 *isp = container_of(dev, struct isp1301, otg);
1410 u32 otg_ctrl;
1411
1412 if (!dev || isp != the_transceiver
1413 || isp->otg.state != OTG_STATE_B_IDLE)
1414 return -ENODEV;
1415
1416 otg_ctrl = OTG_CTRL_REG;
1417 if (!(otg_ctrl & OTG_BSESSEND))
1418 return -EINVAL;
1419
1420 otg_ctrl |= OTG_B_BUSREQ;
1421 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1422 OTG_CTRL_REG = otg_ctrl;
1423 isp->otg.state = OTG_STATE_B_SRP_INIT;
1424
1425 pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), OTG_CTRL_REG);
1426 #ifdef CONFIG_USB_OTG
1427 check_state(isp, __FUNCTION__);
1428 #endif
1429 return 0;
1430 }
1431
1432 static int
1433 isp1301_start_hnp(struct otg_transceiver *dev)
1434 {
1435 #ifdef CONFIG_USB_OTG
1436 struct isp1301 *isp = container_of(dev, struct isp1301, otg);
1437
1438 if (!dev || isp != the_transceiver)
1439 return -ENODEV;
1440 if (isp->otg.default_a && (isp->otg.host == NULL
1441 || !isp->otg.host->b_hnp_enable))
1442 return -ENOTCONN;
1443 if (!isp->otg.default_a && (isp->otg.gadget == NULL
1444 || !isp->otg.gadget->b_hnp_enable))
1445 return -ENOTCONN;
1446
1447 /* We want hardware to manage most HNP protocol timings.
1448 * So do this part as early as possible...
1449 */
1450 switch (isp->otg.state) {
1451 case OTG_STATE_B_HOST:
1452 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1453 /* caller will suspend next */
1454 break;
1455 case OTG_STATE_A_HOST:
1456 #if 0
1457 /* autoconnect mode avoids irq latency bugs */
1458 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1459 MC1_BDIS_ACON_EN);
1460 #endif
1461 /* caller must suspend then clear A_BUSREQ */
1462 usb_gadget_vbus_connect(isp->otg.gadget);
1463 OTG_CTRL_REG |= OTG_A_SETB_HNPEN;
1464
1465 break;
1466 case OTG_STATE_A_PERIPHERAL:
1467 /* initiated by B-Host suspend */
1468 break;
1469 default:
1470 return -EILSEQ;
1471 }
1472 pr_debug("otg: HNP %s, %06x ...\n",
1473 state_name(isp), OTG_CTRL_REG);
1474 check_state(isp, __FUNCTION__);
1475 return 0;
1476 #else
1477 /* srp-only */
1478 return -EINVAL;
1479 #endif
1480 }
1481
1482 /*-------------------------------------------------------------------------*/
1483
1484 /* no error returns, they'd just make bus scanning stop */
1485 static int isp1301_probe(struct i2c_adapter *bus, int address, int kind)
1486 {
1487 int status;
1488 struct isp1301 *isp;
1489 struct i2c_client *i2c;
1490
1491 if (the_transceiver)
1492 return 0;
1493
1494 isp = kzalloc(sizeof *isp, GFP_KERNEL);
1495 if (!isp)
1496 return 0;
1497
1498 INIT_WORK(&isp->work, isp1301_work, isp);
1499 init_timer(&isp->timer);
1500 isp->timer.function = isp1301_timer;
1501 isp->timer.data = (unsigned long) isp;
1502
1503 isp->irq = -1;
1504 isp->client.addr = address;
1505 i2c_set_clientdata(&isp->client, isp);
1506 isp->client.adapter = bus;
1507 isp->client.driver = &isp1301_driver;
1508 strlcpy(isp->client.name, DRIVER_NAME, I2C_NAME_SIZE);
1509 i2c = &isp->client;
1510
1511 /* if this is a true probe, verify the chip ... */
1512 if (kind < 0) {
1513 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1514 if (status != I2C_VENDOR_ID_PHILIPS) {
1515 dev_dbg(&bus->dev, "addr %d not philips id: %d\n",
1516 address, status);
1517 goto fail1;
1518 }
1519 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1520 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1521 dev_dbg(&bus->dev, "%d not isp1301, %d\n",
1522 address, status);
1523 goto fail1;
1524 }
1525 }
1526
1527 status = i2c_attach_client(i2c);
1528 if (status < 0) {
1529 dev_dbg(&bus->dev, "can't attach %s to device %d, err %d\n",
1530 DRIVER_NAME, address, status);
1531 fail1:
1532 kfree(isp);
1533 return 0;
1534 }
1535 isp->i2c_release = i2c->dev.release;
1536 i2c->dev.release = isp1301_release;
1537
1538 /* initial development used chiprev 2.00 */
1539 status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1540 dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1541 status >> 8, status & 0xff);
1542
1543 /* make like power-on reset */
1544 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1545
1546 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1547 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1548
1549 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1550 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1551 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1552 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1553
1554 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1555 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1556 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1557
1558 #ifdef CONFIG_USB_OTG
1559 status = otg_bind(isp);
1560 if (status < 0) {
1561 dev_dbg(&i2c->dev, "can't bind OTG\n");
1562 goto fail2;
1563 }
1564 #endif
1565
1566 if (machine_is_omap_h2()) {
1567 /* full speed signaling by default */
1568 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1569 MC1_SPEED_REG);
1570 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1571 MC2_SPD_SUSP_CTRL);
1572
1573 /* IRQ wired at M14 */
1574 omap_cfg_reg(M14_1510_GPIO2);
1575 isp->irq = OMAP_GPIO_IRQ(2);
1576 omap_request_gpio(2);
1577 omap_set_gpio_direction(2, 1);
1578 omap_set_gpio_edge_ctrl(2, OMAP_GPIO_FALLING_EDGE);
1579 }
1580
1581 status = request_irq(isp->irq, isp1301_irq,
1582 SA_SAMPLE_RANDOM, DRIVER_NAME, isp);
1583 if (status < 0) {
1584 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1585 isp->irq, status);
1586 #ifdef CONFIG_USB_OTG
1587 fail2:
1588 #endif
1589 i2c_detach_client(i2c);
1590 goto fail1;
1591 }
1592
1593 isp->otg.dev = &isp->client.dev;
1594 isp->otg.label = DRIVER_NAME;
1595
1596 isp->otg.set_host = isp1301_set_host,
1597 isp->otg.set_peripheral = isp1301_set_peripheral,
1598 isp->otg.set_power = isp1301_set_power,
1599 isp->otg.start_srp = isp1301_start_srp,
1600 isp->otg.start_hnp = isp1301_start_hnp,
1601
1602 enable_vbus_draw(isp, 0);
1603 power_down(isp);
1604 the_transceiver = isp;
1605
1606 #ifdef CONFIG_USB_OTG
1607 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1608 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1609 #endif
1610
1611 dump_regs(isp, __FUNCTION__);
1612
1613 #ifdef VERBOSE
1614 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1615 dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1616 #endif
1617
1618 status = otg_set_transceiver(&isp->otg);
1619 if (status < 0)
1620 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1621 status);
1622
1623 return 0;
1624 }
1625
1626 static int isp1301_scan_bus(struct i2c_adapter *bus)
1627 {
1628 if (!i2c_check_functionality(bus, I2C_FUNC_SMBUS_BYTE_DATA
1629 | I2C_FUNC_SMBUS_READ_WORD_DATA))
1630 return -EINVAL;
1631 return i2c_probe(bus, &addr_data, isp1301_probe);
1632 }
1633
1634 static struct i2c_driver isp1301_driver = {
1635 .driver = {
1636 .name = "isp1301_omap",
1637 },
1638 .attach_adapter = isp1301_scan_bus,
1639 .detach_client = isp1301_detach_client,
1640 };
1641
1642 /*-------------------------------------------------------------------------*/
1643
1644 static int __init isp_init(void)
1645 {
1646 return i2c_add_driver(&isp1301_driver);
1647 }
1648 module_init(isp_init);
1649
1650 static void __exit isp_exit(void)
1651 {
1652 if (the_transceiver)
1653 otg_set_transceiver(0);
1654 i2c_del_driver(&isp1301_driver);
1655 }
1656 module_exit(isp_exit);
1657
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