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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / i2c / chips / isp1301_omap.c
blob7f29a8aff1656792a46a75444dba89df70f05a91
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/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 static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };
149
150 I2C_CLIENT_INSMOD;
151
152 static struct i2c_driver isp1301_driver;
153
154 /* smbus apis are used for portability */
155
156 static inline u8
157 isp1301_get_u8(struct isp1301 *isp, u8 reg)
158 {
159 return i2c_smbus_read_byte_data(&isp->client, reg + 0);
160 }
161
162 static inline int
163 isp1301_get_u16(struct isp1301 *isp, u8 reg)
164 {
165 return i2c_smbus_read_word_data(&isp->client, reg);
166 }
167
168 static inline int
169 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
170 {
171 return i2c_smbus_write_byte_data(&isp->client, reg + 0, bits);
172 }
173
174 static inline int
175 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
176 {
177 return i2c_smbus_write_byte_data(&isp->client, reg + 1, bits);
178 }
179
180 /*-------------------------------------------------------------------------*/
181
182 /* identification */
183 #define ISP1301_VENDOR_ID 0x00 /* u16 read */
184 #define ISP1301_PRODUCT_ID 0x02 /* u16 read */
185 #define ISP1301_BCD_DEVICE 0x14 /* u16 read */
186
187 #define I2C_VENDOR_ID_PHILIPS 0x04cc
188 #define I2C_PRODUCT_ID_PHILIPS_1301 0x1301
189
190 /* operational registers */
191 #define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */
192 # define MC1_SPEED_REG (1 << 0)
193 # define MC1_SUSPEND_REG (1 << 1)
194 # define MC1_DAT_SE0 (1 << 2)
195 # define MC1_TRANSPARENT (1 << 3)
196 # define MC1_BDIS_ACON_EN (1 << 4)
197 # define MC1_OE_INT_EN (1 << 5)
198 # define MC1_UART_EN (1 << 6)
199 # define MC1_MASK 0x7f
200 #define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */
201 # define MC2_GLOBAL_PWR_DN (1 << 0)
202 # define MC2_SPD_SUSP_CTRL (1 << 1)
203 # define MC2_BI_DI (1 << 2)
204 # define MC2_TRANSP_BDIR0 (1 << 3)
205 # define MC2_TRANSP_BDIR1 (1 << 4)
206 # define MC2_AUDIO_EN (1 << 5)
207 # define MC2_PSW_EN (1 << 6)
208 # define MC2_EN2V7 (1 << 7)
209 #define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */
210 # define OTG1_DP_PULLUP (1 << 0)
211 # define OTG1_DM_PULLUP (1 << 1)
212 # define OTG1_DP_PULLDOWN (1 << 2)
213 # define OTG1_DM_PULLDOWN (1 << 3)
214 # define OTG1_ID_PULLDOWN (1 << 4)
215 # define OTG1_VBUS_DRV (1 << 5)
216 # define OTG1_VBUS_DISCHRG (1 << 6)
217 # define OTG1_VBUS_CHRG (1 << 7)
218 #define ISP1301_OTG_STATUS 0x10 /* u8 readonly */
219 # define OTG_B_SESS_END (1 << 6)
220 # define OTG_B_SESS_VLD (1 << 7)
221
222 #define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */
223 #define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */
224
225 #define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */
226 #define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */
227
228 /* same bitfields in all interrupt registers */
229 # define INTR_VBUS_VLD (1 << 0)
230 # define INTR_SESS_VLD (1 << 1)
231 # define INTR_DP_HI (1 << 2)
232 # define INTR_ID_GND (1 << 3)
233 # define INTR_DM_HI (1 << 4)
234 # define INTR_ID_FLOAT (1 << 5)
235 # define INTR_BDIS_ACON (1 << 6)
236 # define INTR_CR_INT (1 << 7)
237
238 /*-------------------------------------------------------------------------*/
239
240 static const char *state_string(enum usb_otg_state state)
241 {
242 switch (state) {
243 case OTG_STATE_A_IDLE: return "a_idle";
244 case OTG_STATE_A_WAIT_VRISE: return "a_wait_vrise";
245 case OTG_STATE_A_WAIT_BCON: return "a_wait_bcon";
246 case OTG_STATE_A_HOST: return "a_host";
247 case OTG_STATE_A_SUSPEND: return "a_suspend";
248 case OTG_STATE_A_PERIPHERAL: return "a_peripheral";
249 case OTG_STATE_A_WAIT_VFALL: return "a_wait_vfall";
250 case OTG_STATE_A_VBUS_ERR: return "a_vbus_err";
251 case OTG_STATE_B_IDLE: return "b_idle";
252 case OTG_STATE_B_SRP_INIT: return "b_srp_init";
253 case OTG_STATE_B_PERIPHERAL: return "b_peripheral";
254 case OTG_STATE_B_WAIT_ACON: return "b_wait_acon";
255 case OTG_STATE_B_HOST: return "b_host";
256 default: return "UNDEFINED";
257 }
258 }
259
260 static inline const char *state_name(struct isp1301 *isp)
261 {
262 return state_string(isp->otg.state);
263 }
264
265 #ifdef VERBOSE
266 #define dev_vdbg dev_dbg
267 #else
268 #define dev_vdbg(dev, fmt, arg...) do{}while(0)
269 #endif
270
271 /*-------------------------------------------------------------------------*/
272
273 /* NOTE: some of this ISP1301 setup is specific to H2 boards;
274 * not everything is guarded by board-specific checks, or even using
275 * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
276 *
277 * ALSO: this currently doesn't use ISP1301 low-power modes
278 * while OTG is running.
279 */
280
281 static void power_down(struct isp1301 *isp)
282 {
283 isp->otg.state = OTG_STATE_UNDEFINED;
284
285 // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
286 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
287
288 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
289 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
290 }
291
292 static void power_up(struct isp1301 *isp)
293 {
294 // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
295 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
296
297 /* do this only when cpu is driving transceiver,
298 * so host won't see a low speed device...
299 */
300 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
301 }
302
303 #define NO_HOST_SUSPEND
304
305 static int host_suspend(struct isp1301 *isp)
306 {
307 #ifdef NO_HOST_SUSPEND
308 return 0;
309 #else
310 struct device *dev;
311
312 if (!isp->otg.host)
313 return -ENODEV;
314
315 /* Currently ASSUMES only the OTG port matters;
316 * other ports could be active...
317 */
318 dev = isp->otg.host->controller;
319 return dev->driver->suspend(dev, 3, 0);
320 #endif
321 }
322
323 static int host_resume(struct isp1301 *isp)
324 {
325 #ifdef NO_HOST_SUSPEND
326 return 0;
327 #else
328 struct device *dev;
329
330 if (!isp->otg.host)
331 return -ENODEV;
332
333 dev = isp->otg.host->controller;
334 return dev->driver->resume(dev, 0);
335 #endif
336 }
337
338 static int gadget_suspend(struct isp1301 *isp)
339 {
340 isp->otg.gadget->b_hnp_enable = 0;
341 isp->otg.gadget->a_hnp_support = 0;
342 isp->otg.gadget->a_alt_hnp_support = 0;
343 return usb_gadget_vbus_disconnect(isp->otg.gadget);
344 }
345
346 /*-------------------------------------------------------------------------*/
347
348 #define TIMER_MINUTES 10
349 #define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ)
350
351 /* Almost all our I2C messaging comes from a work queue's task context.
352 * NOTE: guaranteeing certain response times might mean we shouldn't
353 * share keventd's work queue; a realtime task might be safest.
354 */
355 void
356 isp1301_defer_work(struct isp1301 *isp, int work)
357 {
358 int status;
359
360 if (isp && !test_and_set_bit(work, &isp->todo)) {
361 (void) get_device(&isp->client.dev);
362 status = schedule_work(&isp->work);
363 if (!status && !isp->working)
364 dev_vdbg(&isp->client.dev,
365 "work item %d may be lost\n", work);
366 }
367 }
368
369 /* called from irq handlers */
370 static void a_idle(struct isp1301 *isp, const char *tag)
371 {
372 if (isp->otg.state == OTG_STATE_A_IDLE)
373 return;
374
375 isp->otg.default_a = 1;
376 if (isp->otg.host) {
377 isp->otg.host->is_b_host = 0;
378 host_suspend(isp);
379 }
380 if (isp->otg.gadget) {
381 isp->otg.gadget->is_a_peripheral = 1;
382 gadget_suspend(isp);
383 }
384 isp->otg.state = OTG_STATE_A_IDLE;
385 isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
386 pr_debug(" --> %s/%s\n", state_name(isp), tag);
387 }
388
389 /* called from irq handlers */
390 static void b_idle(struct isp1301 *isp, const char *tag)
391 {
392 if (isp->otg.state == OTG_STATE_B_IDLE)
393 return;
394
395 isp->otg.default_a = 0;
396 if (isp->otg.host) {
397 isp->otg.host->is_b_host = 1;
398 host_suspend(isp);
399 }
400 if (isp->otg.gadget) {
401 isp->otg.gadget->is_a_peripheral = 0;
402 gadget_suspend(isp);
403 }
404 isp->otg.state = OTG_STATE_B_IDLE;
405 isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
406 pr_debug(" --> %s/%s\n", state_name(isp), tag);
407 }
408
409 static void
410 dump_regs(struct isp1301 *isp, const char *label)
411 {
412 #ifdef DEBUG
413 u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
414 u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
415 u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
416
417 pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
418 OTG_CTRL_REG, label, state_name(isp),
419 ctrl, status, src);
420 /* mode control and irq enables don't change much */
421 #endif
422 }
423
424 /*-------------------------------------------------------------------------*/
425
426 #ifdef CONFIG_USB_OTG
427
428 /*
429 * The OMAP OTG controller handles most of the OTG state transitions.
430 *
431 * We translate isp1301 outputs (mostly voltage comparator status) into
432 * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
433 * flags into isp1301 inputs ... and infer state transitions.
434 */
435
436 #ifdef VERBOSE
437
438 static void check_state(struct isp1301 *isp, const char *tag)
439 {
440 enum usb_otg_state state = OTG_STATE_UNDEFINED;
441 u8 fsm = OTG_TEST_REG & 0x0ff;
442 unsigned extra = 0;
443
444 switch (fsm) {
445
446 /* default-b */
447 case 0x0:
448 state = OTG_STATE_B_IDLE;
449 break;
450 case 0x3:
451 case 0x7:
452 extra = 1;
453 case 0x1:
454 state = OTG_STATE_B_PERIPHERAL;
455 break;
456 case 0x11:
457 state = OTG_STATE_B_SRP_INIT;
458 break;
459
460 /* extra dual-role default-b states */
461 case 0x12:
462 case 0x13:
463 case 0x16:
464 extra = 1;
465 case 0x17:
466 state = OTG_STATE_B_WAIT_ACON;
467 break;
468 case 0x34:
469 state = OTG_STATE_B_HOST;
470 break;
471
472 /* default-a */
473 case 0x36:
474 state = OTG_STATE_A_IDLE;
475 break;
476 case 0x3c:
477 state = OTG_STATE_A_WAIT_VFALL;
478 break;
479 case 0x7d:
480 state = OTG_STATE_A_VBUS_ERR;
481 break;
482 case 0x9e:
483 case 0x9f:
484 extra = 1;
485 case 0x89:
486 state = OTG_STATE_A_PERIPHERAL;
487 break;
488 case 0xb7:
489 state = OTG_STATE_A_WAIT_VRISE;
490 break;
491 case 0xb8:
492 state = OTG_STATE_A_WAIT_BCON;
493 break;
494 case 0xb9:
495 state = OTG_STATE_A_HOST;
496 break;
497 case 0xba:
498 state = OTG_STATE_A_SUSPEND;
499 break;
500 default:
501 break;
502 }
503 if (isp->otg.state == state && !extra)
504 return;
505 pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
506 state_string(state), fsm, state_name(isp), OTG_CTRL_REG);
507 }
508
509 #else
510
511 static inline void check_state(struct isp1301 *isp, const char *tag) { }
512
513 #endif
514
515 /* outputs from ISP1301_INTERRUPT_SOURCE */
516 static void update_otg1(struct isp1301 *isp, u8 int_src)
517 {
518 u32 otg_ctrl;
519
520 otg_ctrl = OTG_CTRL_REG
521 & OTG_CTRL_MASK
522 & ~OTG_XCEIV_INPUTS
523 & ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
524 if (int_src & INTR_SESS_VLD)
525 otg_ctrl |= OTG_ASESSVLD;
526 else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
527 a_idle(isp, "vfall");
528 otg_ctrl &= ~OTG_CTRL_BITS;
529 }
530 if (int_src & INTR_VBUS_VLD)
531 otg_ctrl |= OTG_VBUSVLD;
532 if (int_src & INTR_ID_GND) { /* default-A */
533 if (isp->otg.state == OTG_STATE_B_IDLE
534 || isp->otg.state == OTG_STATE_UNDEFINED) {
535 a_idle(isp, "init");
536 return;
537 }
538 } else { /* default-B */
539 otg_ctrl |= OTG_ID;
540 if (isp->otg.state == OTG_STATE_A_IDLE
541 || isp->otg.state == OTG_STATE_UNDEFINED) {
542 b_idle(isp, "init");
543 return;
544 }
545 }
546 OTG_CTRL_REG = otg_ctrl;
547 }
548
549 /* outputs from ISP1301_OTG_STATUS */
550 static void update_otg2(struct isp1301 *isp, u8 otg_status)
551 {
552 u32 otg_ctrl;
553
554 otg_ctrl = OTG_CTRL_REG
555 & OTG_CTRL_MASK
556 & ~OTG_XCEIV_INPUTS
557 & ~(OTG_BSESSVLD|OTG_BSESSEND);
558 if (otg_status & OTG_B_SESS_VLD)
559 otg_ctrl |= OTG_BSESSVLD;
560 else if (otg_status & OTG_B_SESS_END)
561 otg_ctrl |= OTG_BSESSEND;
562 OTG_CTRL_REG = otg_ctrl;
563 }
564
565 /* inputs going to ISP1301 */
566 static void otg_update_isp(struct isp1301 *isp)
567 {
568 u32 otg_ctrl, otg_change;
569 u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
570
571 otg_ctrl = OTG_CTRL_REG;
572 otg_change = otg_ctrl ^ isp->last_otg_ctrl;
573 isp->last_otg_ctrl = otg_ctrl;
574 otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
575
576 switch (isp->otg.state) {
577 case OTG_STATE_B_IDLE:
578 case OTG_STATE_B_PERIPHERAL:
579 case OTG_STATE_B_SRP_INIT:
580 if (!(otg_ctrl & OTG_PULLUP)) {
581 // if (otg_ctrl & OTG_B_HNPEN) {
582 if (isp->otg.gadget->b_hnp_enable) {
583 isp->otg.state = OTG_STATE_B_WAIT_ACON;
584 pr_debug(" --> b_wait_acon\n");
585 }
586 goto pulldown;
587 }
588 pullup:
589 set |= OTG1_DP_PULLUP;
590 clr |= OTG1_DP_PULLDOWN;
591 break;
592 case OTG_STATE_A_SUSPEND:
593 case OTG_STATE_A_PERIPHERAL:
594 if (otg_ctrl & OTG_PULLUP)
595 goto pullup;
596 /* FALLTHROUGH */
597 // case OTG_STATE_B_WAIT_ACON:
598 default:
599 pulldown:
600 set |= OTG1_DP_PULLDOWN;
601 clr |= OTG1_DP_PULLUP;
602 break;
603 }
604
605 # define toggle(OTG,ISP) do { \
606 if (otg_ctrl & OTG) set |= ISP; \
607 else clr |= ISP; \
608 } while (0)
609
610 if (!(isp->otg.host))
611 otg_ctrl &= ~OTG_DRV_VBUS;
612
613 switch (isp->otg.state) {
614 case OTG_STATE_A_SUSPEND:
615 if (otg_ctrl & OTG_DRV_VBUS) {
616 set |= OTG1_VBUS_DRV;
617 break;
618 }
619 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
620 notresponding(isp);
621
622 /* FALLTHROUGH */
623 case OTG_STATE_A_VBUS_ERR:
624 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
625 pr_debug(" --> a_wait_vfall\n");
626 /* FALLTHROUGH */
627 case OTG_STATE_A_WAIT_VFALL:
628 /* FIXME usbcore thinks port power is still on ... */
629 clr |= OTG1_VBUS_DRV;
630 break;
631 case OTG_STATE_A_IDLE:
632 if (otg_ctrl & OTG_DRV_VBUS) {
633 isp->otg.state = OTG_STATE_A_WAIT_VRISE;
634 pr_debug(" --> a_wait_vrise\n");
635 }
636 /* FALLTHROUGH */
637 default:
638 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
639 }
640
641 toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
642 toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
643
644 # undef toggle
645
646 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
647 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
648
649 /* HNP switch to host or peripheral; and SRP */
650 if (otg_change & OTG_PULLUP) {
651 switch (isp->otg.state) {
652 case OTG_STATE_B_IDLE:
653 if (clr & OTG1_DP_PULLUP)
654 break;
655 isp->otg.state = OTG_STATE_B_PERIPHERAL;
656 pr_debug(" --> b_peripheral\n");
657 break;
658 case OTG_STATE_A_SUSPEND:
659 if (clr & OTG1_DP_PULLUP)
660 break;
661 isp->otg.state = OTG_STATE_A_PERIPHERAL;
662 pr_debug(" --> a_peripheral\n");
663 break;
664 default:
665 break;
666 }
667 OTG_CTRL_REG |= OTG_PULLUP;
668 }
669
670 check_state(isp, __FUNCTION__);
671 dump_regs(isp, "otg->isp1301");
672 }
673
674 static irqreturn_t omap_otg_irq(int irq, void *_isp, struct pt_regs *regs)
675 {
676 u16 otg_irq = OTG_IRQ_SRC_REG;
677 u32 otg_ctrl;
678 int ret = IRQ_NONE;
679 struct isp1301 *isp = _isp;
680
681 /* update ISP1301 transciever from OTG controller */
682 if (otg_irq & OPRT_CHG) {
683 OTG_IRQ_SRC_REG = OPRT_CHG;
684 isp1301_defer_work(isp, WORK_UPDATE_ISP);
685 ret = IRQ_HANDLED;
686
687 /* SRP to become b_peripheral failed */
688 } else if (otg_irq & B_SRP_TMROUT) {
689 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", OTG_CTRL_REG);
690 notresponding(isp);
691
692 /* gadget drivers that care should monitor all kinds of
693 * remote wakeup (SRP, normal) using their own timer
694 * to give "check cable and A-device" messages.
695 */
696 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
697 b_idle(isp, "srp_timeout");
698
699 OTG_IRQ_SRC_REG = B_SRP_TMROUT;
700 ret = IRQ_HANDLED;
701
702 /* HNP to become b_host failed */
703 } else if (otg_irq & B_HNP_FAIL) {
704 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
705 state_name(isp), OTG_CTRL_REG);
706 notresponding(isp);
707
708 otg_ctrl = OTG_CTRL_REG;
709 otg_ctrl |= OTG_BUSDROP;
710 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
711 OTG_CTRL_REG = otg_ctrl;
712
713 /* subset of b_peripheral()... */
714 isp->otg.state = OTG_STATE_B_PERIPHERAL;
715 pr_debug(" --> b_peripheral\n");
716
717 OTG_IRQ_SRC_REG = B_HNP_FAIL;
718 ret = IRQ_HANDLED;
719
720 /* detect SRP from B-device ... */
721 } else if (otg_irq & A_SRP_DETECT) {
722 pr_debug("otg: %s SRP_DETECT, %06x\n",
723 state_name(isp), OTG_CTRL_REG);
724
725 isp1301_defer_work(isp, WORK_UPDATE_OTG);
726 switch (isp->otg.state) {
727 case OTG_STATE_A_IDLE:
728 if (!isp->otg.host)
729 break;
730 isp1301_defer_work(isp, WORK_HOST_RESUME);
731 otg_ctrl = OTG_CTRL_REG;
732 otg_ctrl |= OTG_A_BUSREQ;
733 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
734 & ~OTG_XCEIV_INPUTS
735 & OTG_CTRL_MASK;
736 OTG_CTRL_REG = otg_ctrl;
737 break;
738 default:
739 break;
740 }
741
742 OTG_IRQ_SRC_REG = A_SRP_DETECT;
743 ret = IRQ_HANDLED;
744
745 /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise)
746 * we don't track them separately
747 */
748 } else if (otg_irq & A_REQ_TMROUT) {
749 otg_ctrl = OTG_CTRL_REG;
750 pr_info("otg: BCON_TMOUT from %s, %06x\n",
751 state_name(isp), otg_ctrl);
752 notresponding(isp);
753
754 otg_ctrl |= OTG_BUSDROP;
755 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
756 OTG_CTRL_REG = otg_ctrl;
757 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
758
759 OTG_IRQ_SRC_REG = A_REQ_TMROUT;
760 ret = IRQ_HANDLED;
761
762 /* A-supplied voltage fell too low; overcurrent */
763 } else if (otg_irq & A_VBUS_ERR) {
764 otg_ctrl = OTG_CTRL_REG;
765 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
766 state_name(isp), otg_irq, otg_ctrl);
767
768 otg_ctrl |= OTG_BUSDROP;
769 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
770 OTG_CTRL_REG = otg_ctrl;
771 isp->otg.state = OTG_STATE_A_VBUS_ERR;
772
773 OTG_IRQ_SRC_REG = A_VBUS_ERR;
774 ret = IRQ_HANDLED;
775
776 /* switch driver; the transciever code activates it,
777 * ungating the udc clock or resuming OHCI.
778 */
779 } else if (otg_irq & DRIVER_SWITCH) {
780 int kick = 0;
781
782 otg_ctrl = OTG_CTRL_REG;
783 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
784 state_name(isp),
785 (otg_ctrl & OTG_DRIVER_SEL)
786 ? "gadget" : "host",
787 otg_ctrl);
788 isp1301_defer_work(isp, WORK_UPDATE_ISP);
789
790 /* role is peripheral */
791 if (otg_ctrl & OTG_DRIVER_SEL) {
792 switch (isp->otg.state) {
793 case OTG_STATE_A_IDLE:
794 b_idle(isp, __FUNCTION__);
795 break;
796 default:
797 break;
798 }
799 isp1301_defer_work(isp, WORK_UPDATE_ISP);
800
801 /* role is host */
802 } else {
803 if (!(otg_ctrl & OTG_ID)) {
804 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
805 OTG_CTRL_REG = otg_ctrl | OTG_A_BUSREQ;
806 }
807
808 if (isp->otg.host) {
809 switch (isp->otg.state) {
810 case OTG_STATE_B_WAIT_ACON:
811 isp->otg.state = OTG_STATE_B_HOST;
812 pr_debug(" --> b_host\n");
813 kick = 1;
814 break;
815 case OTG_STATE_A_WAIT_BCON:
816 isp->otg.state = OTG_STATE_A_HOST;
817 pr_debug(" --> a_host\n");
818 break;
819 case OTG_STATE_A_PERIPHERAL:
820 isp->otg.state = OTG_STATE_A_WAIT_BCON;
821 pr_debug(" --> a_wait_bcon\n");
822 break;
823 default:
824 break;
825 }
826 isp1301_defer_work(isp, WORK_HOST_RESUME);
827 }
828 }
829
830 OTG_IRQ_SRC_REG = DRIVER_SWITCH;
831 ret = IRQ_HANDLED;
832
833 if (kick)
834 usb_bus_start_enum(isp->otg.host,
835 isp->otg.host->otg_port);
836 }
837
838 check_state(isp, __FUNCTION__);
839 return ret;
840 }
841
842 static struct platform_device *otg_dev;
843
844 static int otg_init(struct isp1301 *isp)
845 {
846 if (!otg_dev)
847 return -ENODEV;
848
849 dump_regs(isp, __FUNCTION__);
850 /* some of these values are board-specific... */
851 OTG_SYSCON_2_REG |= OTG_EN
852 /* for B-device: */
853 | SRP_GPDATA /* 9msec Bdev D+ pulse */
854 | SRP_GPDVBUS /* discharge after VBUS pulse */
855 // | (3 << 24) /* 2msec VBUS pulse */
856 /* for A-device: */
857 | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */
858 | SRP_DPW /* detect 167+ns SRP pulses */
859 | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */
860 ;
861
862 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
863 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
864
865 check_state(isp, __FUNCTION__);
866 pr_debug("otg: %s, %s %06x\n",
867 state_name(isp), __FUNCTION__, OTG_CTRL_REG);
868
869 OTG_IRQ_EN_REG = DRIVER_SWITCH | OPRT_CHG
870 | B_SRP_TMROUT | B_HNP_FAIL
871 | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT;
872 OTG_SYSCON_2_REG |= OTG_EN;
873
874 return 0;
875 }
876
877 static int otg_probe(struct device *dev)
878 {
879 // struct omap_usb_config *config = dev->platform_data;
880
881 otg_dev = to_platform_device(dev);
882 return 0;
883 }
884
885 static int otg_remove(struct device *dev)
886 {
887 otg_dev = 0;
888 return 0;
889 }
890
891 struct device_driver omap_otg_driver = {
892 .name = "omap_otg",
893 .bus = &platform_bus_type,
894 .probe = otg_probe,
895 .remove = otg_remove,
896 };
897
898 static int otg_bind(struct isp1301 *isp)
899 {
900 int status;
901
902 if (otg_dev)
903 return -EBUSY;
904
905 status = driver_register(&omap_otg_driver);
906 if (status < 0)
907 return status;
908
909 if (otg_dev)
910 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
911 SA_INTERRUPT, DRIVER_NAME, isp);
912 else
913 status = -ENODEV;
914
915 if (status < 0)
916 driver_unregister(&omap_otg_driver);
917 return status;
918 }
919
920 static void otg_unbind(struct isp1301 *isp)
921 {
922 if (!otg_dev)
923 return;
924 free_irq(otg_dev->resource[1].start, isp);
925 }
926
927 #else
928
929 /* OTG controller isn't clocked */
930
931 #endif /* CONFIG_USB_OTG */
932
933 /*-------------------------------------------------------------------------*/
934
935 static void b_peripheral(struct isp1301 *isp)
936 {
937 OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
938 usb_gadget_vbus_connect(isp->otg.gadget);
939
940 #ifdef CONFIG_USB_OTG
941 enable_vbus_draw(isp, 8);
942 otg_update_isp(isp);
943 #else
944 enable_vbus_draw(isp, 100);
945 /* UDC driver just set OTG_BSESSVLD */
946 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
947 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
948 isp->otg.state = OTG_STATE_B_PERIPHERAL;
949 pr_debug(" --> b_peripheral\n");
950 dump_regs(isp, "2periph");
951 #endif
952 }
953
954 static void isp_update_otg(struct isp1301 *isp, u8 stat)
955 {
956 u8 isp_stat, isp_bstat;
957 enum usb_otg_state state = isp->otg.state;
958
959 if (stat & INTR_BDIS_ACON)
960 pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp));
961
962 /* start certain state transitions right away */
963 isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
964 if (isp_stat & INTR_ID_GND) {
965 if (isp->otg.default_a) {
966 switch (state) {
967 case OTG_STATE_B_IDLE:
968 a_idle(isp, "idle");
969 /* FALLTHROUGH */
970 case OTG_STATE_A_IDLE:
971 enable_vbus_source(isp);
972 /* FALLTHROUGH */
973 case OTG_STATE_A_WAIT_VRISE:
974 /* we skip over OTG_STATE_A_WAIT_BCON, since
975 * the HC will transition to A_HOST (or
976 * A_SUSPEND!) without our noticing except
977 * when HNP is used.
978 */
979 if (isp_stat & INTR_VBUS_VLD)
980 isp->otg.state = OTG_STATE_A_HOST;
981 break;
982 case OTG_STATE_A_WAIT_VFALL:
983 if (!(isp_stat & INTR_SESS_VLD))
984 a_idle(isp, "vfell");
985 break;
986 default:
987 if (!(isp_stat & INTR_VBUS_VLD))
988 isp->otg.state = OTG_STATE_A_VBUS_ERR;
989 break;
990 }
991 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
992 } else {
993 switch (state) {
994 case OTG_STATE_B_PERIPHERAL:
995 case OTG_STATE_B_HOST:
996 case OTG_STATE_B_WAIT_ACON:
997 usb_gadget_vbus_disconnect(isp->otg.gadget);
998 break;
999 default:
1000 break;
1001 }
1002 if (state != OTG_STATE_A_IDLE)
1003 a_idle(isp, "id");
1004 if (isp->otg.host && state == OTG_STATE_A_IDLE)
1005 isp1301_defer_work(isp, WORK_HOST_RESUME);
1006 isp_bstat = 0;
1007 }
1008 } else {
1009 /* if user unplugged mini-A end of cable,
1010 * don't bypass A_WAIT_VFALL.
1011 */
1012 if (isp->otg.default_a) {
1013 switch (state) {
1014 default:
1015 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1016 break;
1017 case OTG_STATE_A_WAIT_VFALL:
1018 state = OTG_STATE_A_IDLE;
1019 /* khubd may take a while to notice and
1020 * handle this disconnect, so don't go
1021 * to B_IDLE quite yet.
1022 */
1023 break;
1024 case OTG_STATE_A_IDLE:
1025 host_suspend(isp);
1026 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1027 MC1_BDIS_ACON_EN);
1028 isp->otg.state = OTG_STATE_B_IDLE;
1029 OTG_CTRL_REG &= OTG_CTRL_REG & OTG_CTRL_MASK
1030 & ~OTG_CTRL_BITS;
1031 break;
1032 case OTG_STATE_B_IDLE:
1033 break;
1034 }
1035 }
1036 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1037
1038 switch (isp->otg.state) {
1039 case OTG_STATE_B_PERIPHERAL:
1040 case OTG_STATE_B_WAIT_ACON:
1041 case OTG_STATE_B_HOST:
1042 if (likely(isp_bstat & OTG_B_SESS_VLD))
1043 break;
1044 enable_vbus_draw(isp, 0);
1045 #ifndef CONFIG_USB_OTG
1046 /* UDC driver will clear OTG_BSESSVLD */
1047 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1048 OTG1_DP_PULLDOWN);
1049 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1050 OTG1_DP_PULLUP);
1051 dump_regs(isp, __FUNCTION__);
1052 #endif
1053 /* FALLTHROUGH */
1054 case OTG_STATE_B_SRP_INIT:
1055 b_idle(isp, __FUNCTION__);
1056 OTG_CTRL_REG &= OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
1057 /* FALLTHROUGH */
1058 case OTG_STATE_B_IDLE:
1059 if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1060 #ifdef CONFIG_USB_OTG
1061 update_otg1(isp, isp_stat);
1062 update_otg2(isp, isp_bstat);
1063 #endif
1064 b_peripheral(isp);
1065 } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1066 isp_bstat |= OTG_B_SESS_END;
1067 break;
1068 case OTG_STATE_A_WAIT_VFALL:
1069 break;
1070 default:
1071 pr_debug("otg: unsupported b-device %s\n",
1072 state_name(isp));
1073 break;
1074 }
1075 }
1076
1077 if (state != isp->otg.state)
1078 pr_debug(" isp, %s -> %s\n",
1079 state_string(state), state_name(isp));
1080
1081 #ifdef CONFIG_USB_OTG
1082 /* update the OTG controller state to match the isp1301; may
1083 * trigger OPRT_CHG irqs for changes going to the isp1301.
1084 */
1085 update_otg1(isp, isp_stat);
1086 update_otg2(isp, isp_bstat);
1087 check_state(isp, __FUNCTION__);
1088 #endif
1089
1090 dump_regs(isp, "isp1301->otg");
1091 }
1092
1093 /*-------------------------------------------------------------------------*/
1094
1095 static u8 isp1301_clear_latch(struct isp1301 *isp)
1096 {
1097 u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1098 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1099 return latch;
1100 }
1101
1102 static void
1103 isp1301_work(void *data)
1104 {
1105 struct isp1301 *isp = data;
1106 int stop;
1107
1108 /* implicit lock: we're the only task using this device */
1109 isp->working = 1;
1110 do {
1111 stop = test_bit(WORK_STOP, &isp->todo);
1112
1113 #ifdef CONFIG_USB_OTG
1114 /* transfer state from otg engine to isp1301 */
1115 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1116 otg_update_isp(isp);
1117 put_device(&isp->client.dev);
1118 }
1119 #endif
1120 /* transfer state from isp1301 to otg engine */
1121 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1122 u8 stat = isp1301_clear_latch(isp);
1123
1124 isp_update_otg(isp, stat);
1125 put_device(&isp->client.dev);
1126 }
1127
1128 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1129 u32 otg_ctrl;
1130
1131 /*
1132 * skip A_WAIT_VRISE; hc transitions invisibly
1133 * skip A_WAIT_BCON; same.
1134 */
1135 switch (isp->otg.state) {
1136 case OTG_STATE_A_WAIT_BCON:
1137 case OTG_STATE_A_WAIT_VRISE:
1138 isp->otg.state = OTG_STATE_A_HOST;
1139 pr_debug(" --> a_host\n");
1140 otg_ctrl = OTG_CTRL_REG;
1141 otg_ctrl |= OTG_A_BUSREQ;
1142 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1143 & OTG_CTRL_MASK;
1144 OTG_CTRL_REG = otg_ctrl;
1145 break;
1146 case OTG_STATE_B_WAIT_ACON:
1147 isp->otg.state = OTG_STATE_B_HOST;
1148 pr_debug(" --> b_host (acon)\n");
1149 break;
1150 case OTG_STATE_B_HOST:
1151 case OTG_STATE_B_IDLE:
1152 case OTG_STATE_A_IDLE:
1153 break;
1154 default:
1155 pr_debug(" host resume in %s\n",
1156 state_name(isp));
1157 }
1158 host_resume(isp);
1159 // mdelay(10);
1160 put_device(&isp->client.dev);
1161 }
1162
1163 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1164 #ifdef VERBOSE
1165 dump_regs(isp, "timer");
1166 if (!stop)
1167 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1168 #endif
1169 put_device(&isp->client.dev);
1170 }
1171
1172 if (isp->todo)
1173 dev_vdbg(&isp->client.dev,
1174 "work done, todo = 0x%lx\n",
1175 isp->todo);
1176 if (stop) {
1177 dev_dbg(&isp->client.dev, "stop\n");
1178 break;
1179 }
1180 } while (isp->todo);
1181 isp->working = 0;
1182 }
1183
1184 static irqreturn_t isp1301_irq(int irq, void *isp, struct pt_regs *regs)
1185 {
1186 isp1301_defer_work(isp, WORK_UPDATE_OTG);
1187 return IRQ_HANDLED;
1188 }
1189
1190 static void isp1301_timer(unsigned long _isp)
1191 {
1192 isp1301_defer_work((void *)_isp, WORK_TIMER);
1193 }
1194
1195 /*-------------------------------------------------------------------------*/
1196
1197 static void isp1301_release(struct device *dev)
1198 {
1199 struct isp1301 *isp;
1200
1201 isp = container_of(dev, struct isp1301, client.dev);
1202
1203 /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1204 if (isp->i2c_release)
1205 isp->i2c_release(dev);
1206 kfree (isp);
1207 }
1208
1209 static struct isp1301 *the_transceiver;
1210
1211 static int isp1301_detach_client(struct i2c_client *i2c)
1212 {
1213 struct isp1301 *isp;
1214
1215 isp = container_of(i2c, struct isp1301, client);
1216
1217 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1218 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1219 free_irq(isp->irq, isp);
1220 #ifdef CONFIG_USB_OTG
1221 otg_unbind(isp);
1222 #endif
1223 if (machine_is_omap_h2())
1224 omap_free_gpio(2);
1225
1226 isp->timer.data = 0;
1227 set_bit(WORK_STOP, &isp->todo);
1228 del_timer_sync(&isp->timer);
1229 flush_scheduled_work();
1230
1231 put_device(&i2c->dev);
1232 the_transceiver = 0;
1233
1234 return i2c_detach_client(i2c);
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 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 otg_transceiver *otg, struct usb_bus *host)
1277 {
1278 struct isp1301 *isp = container_of(otg, struct isp1301, otg);
1279
1280 if (!otg || isp != the_transceiver)
1281 return -ENODEV;
1282
1283 if (!host) {
1284 OTG_IRQ_EN_REG = 0;
1285 power_down(isp);
1286 isp->otg.host = 0;
1287 return 0;
1288 }
1289
1290 #ifdef CONFIG_USB_OTG
1291 isp->otg.host = host;
1292 dev_dbg(&isp->client.dev, "registered host\n");
1293 host_suspend(isp);
1294 if (isp->otg.gadget)
1295 return isp1301_otg_enable(isp);
1296 return 0;
1297
1298 #elif !defined(CONFIG_USB_GADGET_OMAP)
1299 // FIXME update its refcount
1300 isp->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, __FUNCTION__);
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 otg_transceiver *otg, struct usb_gadget *gadget)
1333 {
1334 struct isp1301 *isp = container_of(otg, struct isp1301, otg);
1335
1336 if (!otg || isp != the_transceiver)
1337 return -ENODEV;
1338
1339 if (!gadget) {
1340 OTG_IRQ_EN_REG = 0;
1341 if (!isp->otg.default_a)
1342 enable_vbus_draw(isp, 0);
1343 usb_gadget_vbus_disconnect(isp->otg.gadget);
1344 isp->otg.gadget = 0;
1345 power_down(isp);
1346 return 0;
1347 }
1348
1349 #ifdef CONFIG_USB_OTG
1350 isp->otg.gadget = gadget;
1351 dev_dbg(&isp->client.dev, "registered gadget\n");
1352 /* gadget driver may be suspended until vbus_connect () */
1353 if (isp->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 isp->otg.gadget = gadget;
1359 // FIXME update its refcount
1360
1361 OTG_CTRL_REG = (OTG_CTRL_REG & OTG_CTRL_MASK
1362 & ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS))
1363 | OTG_ID;
1364 power_up(isp);
1365 isp->otg.state = OTG_STATE_B_IDLE;
1366
1367 if (machine_is_omap_h2())
1368 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1369
1370 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1371 INTR_SESS_VLD);
1372 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1373 INTR_VBUS_VLD);
1374 dev_info(&isp->client.dev, "B-Peripheral sessions ok\n");
1375 dump_regs(isp, __FUNCTION__);
1376
1377 /* If this has a Mini-AB connector, this mode is highly
1378 * nonstandard ... but can be handy for testing, so long
1379 * as you don't plug a Mini-A cable into the jack.
1380 */
1381 if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1382 b_peripheral(isp);
1383
1384 return 0;
1385
1386 #else
1387 dev_dbg(&isp->client.dev, "peripheral sessions not allowed\n");
1388 return -EINVAL;
1389 #endif
1390 }
1391
1392
1393 /*-------------------------------------------------------------------------*/
1394
1395 static int
1396 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1397 {
1398 if (!the_transceiver)
1399 return -ENODEV;
1400 if (dev->state == OTG_STATE_B_PERIPHERAL)
1401 enable_vbus_draw(the_transceiver, mA);
1402 return 0;
1403 }
1404
1405 static int
1406 isp1301_start_srp(struct otg_transceiver *dev)
1407 {
1408 struct isp1301 *isp = container_of(dev, struct isp1301, otg);
1409 u32 otg_ctrl;
1410
1411 if (!dev || isp != the_transceiver
1412 || isp->otg.state != OTG_STATE_B_IDLE)
1413 return -ENODEV;
1414
1415 otg_ctrl = OTG_CTRL_REG;
1416 if (!(otg_ctrl & OTG_BSESSEND))
1417 return -EINVAL;
1418
1419 otg_ctrl |= OTG_B_BUSREQ;
1420 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1421 OTG_CTRL_REG = otg_ctrl;
1422 isp->otg.state = OTG_STATE_B_SRP_INIT;
1423
1424 pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), OTG_CTRL_REG);
1425 #ifdef CONFIG_USB_OTG
1426 check_state(isp, __FUNCTION__);
1427 #endif
1428 return 0;
1429 }
1430
1431 static int
1432 isp1301_start_hnp(struct otg_transceiver *dev)
1433 {
1434 #ifdef CONFIG_USB_OTG
1435 struct isp1301 *isp = container_of(dev, struct isp1301, otg);
1436
1437 if (!dev || isp != the_transceiver)
1438 return -ENODEV;
1439 if (isp->otg.default_a && (isp->otg.host == NULL
1440 || !isp->otg.host->b_hnp_enable))
1441 return -ENOTCONN;
1442 if (!isp->otg.default_a && (isp->otg.gadget == NULL
1443 || !isp->otg.gadget->b_hnp_enable))
1444 return -ENOTCONN;
1445
1446 /* We want hardware to manage most HNP protocol timings.
1447 * So do this part as early as possible...
1448 */
1449 switch (isp->otg.state) {
1450 case OTG_STATE_B_HOST:
1451 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1452 /* caller will suspend next */
1453 break;
1454 case OTG_STATE_A_HOST:
1455 #if 0
1456 /* autoconnect mode avoids irq latency bugs */
1457 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1458 MC1_BDIS_ACON_EN);
1459 #endif
1460 /* caller must suspend then clear A_BUSREQ */
1461 usb_gadget_vbus_connect(isp->otg.gadget);
1462 OTG_CTRL_REG |= OTG_A_SETB_HNPEN;
1463
1464 break;
1465 case OTG_STATE_A_PERIPHERAL:
1466 /* initiated by B-Host suspend */
1467 break;
1468 default:
1469 return -EILSEQ;
1470 }
1471 pr_debug("otg: HNP %s, %06x ...\n",
1472 state_name(isp), OTG_CTRL_REG);
1473 check_state(isp, __FUNCTION__);
1474 return 0;
1475 #else
1476 /* srp-only */
1477 return -EINVAL;
1478 #endif
1479 }
1480
1481 /*-------------------------------------------------------------------------*/
1482
1483 /* no error returns, they'd just make bus scanning stop */
1484 static int isp1301_probe(struct i2c_adapter *bus, int address, int kind)
1485 {
1486 int status;
1487 struct isp1301 *isp;
1488 struct i2c_client *i2c;
1489
1490 if (the_transceiver)
1491 return 0;
1492
1493 isp = kcalloc(1, sizeof *isp, GFP_KERNEL);
1494 if (!isp)
1495 return 0;
1496
1497 INIT_WORK(&isp->work, isp1301_work, isp);
1498 init_timer(&isp->timer);
1499 isp->timer.function = isp1301_timer;
1500 isp->timer.data = (unsigned long) isp;
1501
1502 isp->irq = -1;
1503 isp->client.addr = address;
1504 i2c_set_clientdata(&isp->client, isp);
1505 isp->client.adapter = bus;
1506 isp->client.driver = &isp1301_driver;
1507 strlcpy(isp->client.name, DRIVER_NAME, I2C_NAME_SIZE);
1508 i2c = &isp->client;
1509
1510 /* if this is a true probe, verify the chip ... */
1511 if (kind < 0) {
1512 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1513 if (status != I2C_VENDOR_ID_PHILIPS) {
1514 dev_dbg(&bus->dev, "addr %d not philips id: %d\n",
1515 address, status);
1516 goto fail1;
1517 }
1518 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1519 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1520 dev_dbg(&bus->dev, "%d not isp1301, %d\n",
1521 address, status);
1522 goto fail1;
1523 }
1524 }
1525
1526 status = i2c_attach_client(i2c);
1527 if (status < 0) {
1528 dev_dbg(&bus->dev, "can't attach %s to device %d, err %d\n",
1529 DRIVER_NAME, address, status);
1530 fail1:
1531 kfree(isp);
1532 return 0;
1533 }
1534 isp->i2c_release = i2c->dev.release;
1535 i2c->dev.release = isp1301_release;
1536
1537 /* initial development used chiprev 2.00 */
1538 status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1539 dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1540 status >> 8, status & 0xff);
1541
1542 /* make like power-on reset */
1543 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1544
1545 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1546 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1547
1548 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1549 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1550 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1551 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1552
1553 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1554 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1555 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1556
1557 #ifdef CONFIG_USB_OTG
1558 status = otg_bind(isp);
1559 if (status < 0) {
1560 dev_dbg(&i2c->dev, "can't bind OTG\n");
1561 goto fail2;
1562 }
1563 #endif
1564
1565 if (machine_is_omap_h2()) {
1566 /* full speed signaling by default */
1567 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1568 MC1_SPEED_REG);
1569 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1570 MC2_SPD_SUSP_CTRL);
1571
1572 /* IRQ wired at M14 */
1573 omap_cfg_reg(M14_1510_GPIO2);
1574 isp->irq = OMAP_GPIO_IRQ(2);
1575 omap_request_gpio(2);
1576 omap_set_gpio_direction(2, 1);
1577 omap_set_gpio_edge_ctrl(2, OMAP_GPIO_FALLING_EDGE);
1578 }
1579
1580 status = request_irq(isp->irq, isp1301_irq,
1581 SA_SAMPLE_RANDOM, DRIVER_NAME, isp);
1582 if (status < 0) {
1583 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1584 isp->irq, status);
1585 #ifdef CONFIG_USB_OTG
1586 fail2:
1587 #endif
1588 i2c_detach_client(i2c);
1589 goto fail1;
1590 }
1591
1592 isp->otg.dev = &isp->client.dev;
1593 isp->otg.label = DRIVER_NAME;
1594
1595 isp->otg.set_host = isp1301_set_host,
1596 isp->otg.set_peripheral = isp1301_set_peripheral,
1597 isp->otg.set_power = isp1301_set_power,
1598 isp->otg.start_srp = isp1301_start_srp,
1599 isp->otg.start_hnp = isp1301_start_hnp,
1600
1601 enable_vbus_draw(isp, 0);
1602 power_down(isp);
1603 the_transceiver = isp;
1604
1605 #ifdef CONFIG_USB_OTG
1606 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1607 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1608 #endif
1609
1610 dump_regs(isp, __FUNCTION__);
1611
1612 #ifdef VERBOSE
1613 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1614 dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1615 #endif
1616
1617 status = otg_set_transceiver(&isp->otg);
1618 if (status < 0)
1619 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1620 status);
1621
1622 return 0;
1623 }
1624
1625 static int isp1301_scan_bus(struct i2c_adapter *bus)
1626 {
1627 if (!i2c_check_functionality(bus, I2C_FUNC_SMBUS_BYTE_DATA
1628 | I2C_FUNC_SMBUS_READ_WORD_DATA))
1629 return -EINVAL;
1630 return i2c_probe(bus, &addr_data, isp1301_probe);
1631 }
1632
1633 static struct i2c_driver isp1301_driver = {
1634 .owner = THIS_MODULE,
1635 .name = "isp1301_omap",
1636 .id = 1301, /* FIXME "official", i2c-ids.h */
1637 .class = I2C_CLASS_HWMON,
1638 .flags = I2C_DF_NOTIFY,
1639 .attach_adapter = isp1301_scan_bus,
1640 .detach_client = isp1301_detach_client,
1641 };
1642
1643 /*-------------------------------------------------------------------------*/
1644
1645 static int __init isp_init(void)
1646 {
1647 return i2c_add_driver(&isp1301_driver);
1648 }
1649 module_init(isp_init);
1650
1651 static void __exit isp_exit(void)
1652 {
1653 if (the_transceiver)
1654 otg_set_transceiver(0);
1655 i2c_del_driver(&isp1301_driver);
1656 }
1657 module_exit(isp_exit);
1658
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