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Merge git://git.infradead.org/mtd-2.6
[pv_ops_mirror.git] / drivers / i2c / chips / isp1301_omap.c
blobfe04e46991aa9911967c267166c4b11db944cc6f
1 /*
2 * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
3 *
4 * Copyright (C) 2004 Texas Instruments
5 * Copyright (C) 2004 David Brownell
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 #include <linux/usb/ch9.h>
29 #include <linux/usb_gadget.h>
30 #include <linux/usb.h>
31 #include <linux/usb/otg.h>
32 #include <linux/i2c.h>
33 #include <linux/workqueue.h>
34
35 #include <asm/irq.h>
36 #include <asm/arch/usb.h>
37
38
39 #ifndef DEBUG
40 #undef VERBOSE
41 #endif
42
43
44 #define DRIVER_VERSION "24 August 2004"
45 #define DRIVER_NAME (isp1301_driver.driver.name)
46
47 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
48 MODULE_LICENSE("GPL");
49
50 struct isp1301 {
51 struct otg_transceiver otg;
52 struct i2c_client client;
53 void (*i2c_release)(struct device *dev);
54
55 int irq;
56 int irq_type;
57
58 u32 last_otg_ctrl;
59 unsigned working:1;
60
61 struct timer_list timer;
62
63 /* use keventd context to change the state for us */
64 struct work_struct work;
65
66 unsigned long todo;
67 # define WORK_UPDATE_ISP 0 /* update ISP from OTG */
68 # define WORK_UPDATE_OTG 1 /* update OTG from ISP */
69 # define WORK_HOST_RESUME 4 /* resume host */
70 # define WORK_TIMER 6 /* timer fired */
71 # define WORK_STOP 7 /* don't resubmit */
72 };
73
74
75 /* bits in OTG_CTRL_REG */
76
77 #define OTG_XCEIV_OUTPUTS \
78 (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
79 #define OTG_XCEIV_INPUTS \
80 (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
81 #define OTG_CTRL_BITS \
82 (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
83 /* and OTG_PULLUP is sometimes written */
84
85 #define OTG_CTRL_MASK (OTG_DRIVER_SEL| \
86 OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
87 OTG_CTRL_BITS)
88
89
90 /*-------------------------------------------------------------------------*/
91
92 #ifdef CONFIG_MACH_OMAP_H2
93
94 /* board-specific PM hooks */
95
96 #include <asm/gpio.h>
97 #include <asm/arch/mux.h>
98 #include <asm/mach-types.h>
99
100
101 #if defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE)
102
103 #include <asm/arch/tps65010.h>
104
105 #else
106
107 static inline int tps65010_set_vbus_draw(unsigned mA)
108 {
109 pr_debug("tps65010: draw %d mA (STUB)\n", mA);
110 return 0;
111 }
112
113 #endif
114
115 static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
116 {
117 int status = tps65010_set_vbus_draw(mA);
118 if (status < 0)
119 pr_debug(" VBUS %d mA error %d\n", mA, status);
120 }
121
122 static void enable_vbus_source(struct isp1301 *isp)
123 {
124 /* this board won't supply more than 8mA vbus power.
125 * some boards can switch a 100ma "unit load" (or more).
126 */
127 }
128
129
130 /* products will deliver OTG messages with LEDs, GUI, etc */
131 static inline void notresponding(struct isp1301 *isp)
132 {
133 printk(KERN_NOTICE "OTG device not responding.\n");
134 }
135
136
137 #endif
138
139 /*-------------------------------------------------------------------------*/
140
141 /* only two addresses possible */
142 #define ISP_BASE 0x2c
143 static unsigned short normal_i2c[] = {
144 ISP_BASE, ISP_BASE + 1,
145 I2C_CLIENT_END };
146
147 I2C_CLIENT_INSMOD;
148
149 static struct i2c_driver isp1301_driver;
150
151 /* smbus apis are used for portability */
152
153 static inline u8
154 isp1301_get_u8(struct isp1301 *isp, u8 reg)
155 {
156 return i2c_smbus_read_byte_data(&isp->client, reg + 0);
157 }
158
159 static inline int
160 isp1301_get_u16(struct isp1301 *isp, u8 reg)
161 {
162 return i2c_smbus_read_word_data(&isp->client, reg);
163 }
164
165 static inline int
166 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
167 {
168 return i2c_smbus_write_byte_data(&isp->client, reg + 0, bits);
169 }
170
171 static inline int
172 isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
173 {
174 return i2c_smbus_write_byte_data(&isp->client, reg + 1, bits);
175 }
176
177 /*-------------------------------------------------------------------------*/
178
179 /* identification */
180 #define ISP1301_VENDOR_ID 0x00 /* u16 read */
181 #define ISP1301_PRODUCT_ID 0x02 /* u16 read */
182 #define ISP1301_BCD_DEVICE 0x14 /* u16 read */
183
184 #define I2C_VENDOR_ID_PHILIPS 0x04cc
185 #define I2C_PRODUCT_ID_PHILIPS_1301 0x1301
186
187 /* operational registers */
188 #define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */
189 # define MC1_SPEED_REG (1 << 0)
190 # define MC1_SUSPEND_REG (1 << 1)
191 # define MC1_DAT_SE0 (1 << 2)
192 # define MC1_TRANSPARENT (1 << 3)
193 # define MC1_BDIS_ACON_EN (1 << 4)
194 # define MC1_OE_INT_EN (1 << 5)
195 # define MC1_UART_EN (1 << 6)
196 # define MC1_MASK 0x7f
197 #define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */
198 # define MC2_GLOBAL_PWR_DN (1 << 0)
199 # define MC2_SPD_SUSP_CTRL (1 << 1)
200 # define MC2_BI_DI (1 << 2)
201 # define MC2_TRANSP_BDIR0 (1 << 3)
202 # define MC2_TRANSP_BDIR1 (1 << 4)
203 # define MC2_AUDIO_EN (1 << 5)
204 # define MC2_PSW_EN (1 << 6)
205 # define MC2_EN2V7 (1 << 7)
206 #define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */
207 # define OTG1_DP_PULLUP (1 << 0)
208 # define OTG1_DM_PULLUP (1 << 1)
209 # define OTG1_DP_PULLDOWN (1 << 2)
210 # define OTG1_DM_PULLDOWN (1 << 3)
211 # define OTG1_ID_PULLDOWN (1 << 4)
212 # define OTG1_VBUS_DRV (1 << 5)
213 # define OTG1_VBUS_DISCHRG (1 << 6)
214 # define OTG1_VBUS_CHRG (1 << 7)
215 #define ISP1301_OTG_STATUS 0x10 /* u8 readonly */
216 # define OTG_B_SESS_END (1 << 6)
217 # define OTG_B_SESS_VLD (1 << 7)
218
219 #define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */
220 #define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */
221
222 #define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */
223 #define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */
224
225 /* same bitfields in all interrupt registers */
226 # define INTR_VBUS_VLD (1 << 0)
227 # define INTR_SESS_VLD (1 << 1)
228 # define INTR_DP_HI (1 << 2)
229 # define INTR_ID_GND (1 << 3)
230 # define INTR_DM_HI (1 << 4)
231 # define INTR_ID_FLOAT (1 << 5)
232 # define INTR_BDIS_ACON (1 << 6)
233 # define INTR_CR_INT (1 << 7)
234
235 /*-------------------------------------------------------------------------*/
236
237 static const char *state_string(enum usb_otg_state state)
238 {
239 switch (state) {
240 case OTG_STATE_A_IDLE: return "a_idle";
241 case OTG_STATE_A_WAIT_VRISE: return "a_wait_vrise";
242 case OTG_STATE_A_WAIT_BCON: return "a_wait_bcon";
243 case OTG_STATE_A_HOST: return "a_host";
244 case OTG_STATE_A_SUSPEND: return "a_suspend";
245 case OTG_STATE_A_PERIPHERAL: return "a_peripheral";
246 case OTG_STATE_A_WAIT_VFALL: return "a_wait_vfall";
247 case OTG_STATE_A_VBUS_ERR: return "a_vbus_err";
248 case OTG_STATE_B_IDLE: return "b_idle";
249 case OTG_STATE_B_SRP_INIT: return "b_srp_init";
250 case OTG_STATE_B_PERIPHERAL: return "b_peripheral";
251 case OTG_STATE_B_WAIT_ACON: return "b_wait_acon";
252 case OTG_STATE_B_HOST: return "b_host";
253 default: return "UNDEFINED";
254 }
255 }
256
257 static inline const char *state_name(struct isp1301 *isp)
258 {
259 return state_string(isp->otg.state);
260 }
261
262 #ifdef VERBOSE
263 #define dev_vdbg dev_dbg
264 #else
265 #define dev_vdbg(dev, fmt, arg...) do{}while(0)
266 #endif
267
268 /*-------------------------------------------------------------------------*/
269
270 /* NOTE: some of this ISP1301 setup is specific to H2 boards;
271 * not everything is guarded by board-specific checks, or even using
272 * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
273 *
274 * ALSO: this currently doesn't use ISP1301 low-power modes
275 * while OTG is running.
276 */
277
278 static void power_down(struct isp1301 *isp)
279 {
280 isp->otg.state = OTG_STATE_UNDEFINED;
281
282 // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
283 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
284
285 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
286 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
287 }
288
289 static void power_up(struct isp1301 *isp)
290 {
291 // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
292 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
293
294 /* do this only when cpu is driving transceiver,
295 * so host won't see a low speed device...
296 */
297 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
298 }
299
300 #define NO_HOST_SUSPEND
301
302 static int host_suspend(struct isp1301 *isp)
303 {
304 #ifdef NO_HOST_SUSPEND
305 return 0;
306 #else
307 struct device *dev;
308
309 if (!isp->otg.host)
310 return -ENODEV;
311
312 /* Currently ASSUMES only the OTG port matters;
313 * other ports could be active...
314 */
315 dev = isp->otg.host->controller;
316 return dev->driver->suspend(dev, 3, 0);
317 #endif
318 }
319
320 static int host_resume(struct isp1301 *isp)
321 {
322 #ifdef NO_HOST_SUSPEND
323 return 0;
324 #else
325 struct device *dev;
326
327 if (!isp->otg.host)
328 return -ENODEV;
329
330 dev = isp->otg.host->controller;
331 return dev->driver->resume(dev, 0);
332 #endif
333 }
334
335 static int gadget_suspend(struct isp1301 *isp)
336 {
337 isp->otg.gadget->b_hnp_enable = 0;
338 isp->otg.gadget->a_hnp_support = 0;
339 isp->otg.gadget->a_alt_hnp_support = 0;
340 return usb_gadget_vbus_disconnect(isp->otg.gadget);
341 }
342
343 /*-------------------------------------------------------------------------*/
344
345 #define TIMER_MINUTES 10
346 #define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ)
347
348 /* Almost all our I2C messaging comes from a work queue's task context.
349 * NOTE: guaranteeing certain response times might mean we shouldn't
350 * share keventd's work queue; a realtime task might be safest.
351 */
352 void
353 isp1301_defer_work(struct isp1301 *isp, int work)
354 {
355 int status;
356
357 if (isp && !test_and_set_bit(work, &isp->todo)) {
358 (void) get_device(&isp->client.dev);
359 status = schedule_work(&isp->work);
360 if (!status && !isp->working)
361 dev_vdbg(&isp->client.dev,
362 "work item %d may be lost\n", work);
363 }
364 }
365
366 /* called from irq handlers */
367 static void a_idle(struct isp1301 *isp, const char *tag)
368 {
369 if (isp->otg.state == OTG_STATE_A_IDLE)
370 return;
371
372 isp->otg.default_a = 1;
373 if (isp->otg.host) {
374 isp->otg.host->is_b_host = 0;
375 host_suspend(isp);
376 }
377 if (isp->otg.gadget) {
378 isp->otg.gadget->is_a_peripheral = 1;
379 gadget_suspend(isp);
380 }
381 isp->otg.state = OTG_STATE_A_IDLE;
382 isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
383 pr_debug(" --> %s/%s\n", state_name(isp), tag);
384 }
385
386 /* called from irq handlers */
387 static void b_idle(struct isp1301 *isp, const char *tag)
388 {
389 if (isp->otg.state == OTG_STATE_B_IDLE)
390 return;
391
392 isp->otg.default_a = 0;
393 if (isp->otg.host) {
394 isp->otg.host->is_b_host = 1;
395 host_suspend(isp);
396 }
397 if (isp->otg.gadget) {
398 isp->otg.gadget->is_a_peripheral = 0;
399 gadget_suspend(isp);
400 }
401 isp->otg.state = OTG_STATE_B_IDLE;
402 isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
403 pr_debug(" --> %s/%s\n", state_name(isp), tag);
404 }
405
406 static void
407 dump_regs(struct isp1301 *isp, const char *label)
408 {
409 #ifdef DEBUG
410 u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
411 u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
412 u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
413
414 pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
415 OTG_CTRL_REG, label, state_name(isp),
416 ctrl, status, src);
417 /* mode control and irq enables don't change much */
418 #endif
419 }
420
421 /*-------------------------------------------------------------------------*/
422
423 #ifdef CONFIG_USB_OTG
424
425 /*
426 * The OMAP OTG controller handles most of the OTG state transitions.
427 *
428 * We translate isp1301 outputs (mostly voltage comparator status) into
429 * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
430 * flags into isp1301 inputs ... and infer state transitions.
431 */
432
433 #ifdef VERBOSE
434
435 static void check_state(struct isp1301 *isp, const char *tag)
436 {
437 enum usb_otg_state state = OTG_STATE_UNDEFINED;
438 u8 fsm = OTG_TEST_REG & 0x0ff;
439 unsigned extra = 0;
440
441 switch (fsm) {
442
443 /* default-b */
444 case 0x0:
445 state = OTG_STATE_B_IDLE;
446 break;
447 case 0x3:
448 case 0x7:
449 extra = 1;
450 case 0x1:
451 state = OTG_STATE_B_PERIPHERAL;
452 break;
453 case 0x11:
454 state = OTG_STATE_B_SRP_INIT;
455 break;
456
457 /* extra dual-role default-b states */
458 case 0x12:
459 case 0x13:
460 case 0x16:
461 extra = 1;
462 case 0x17:
463 state = OTG_STATE_B_WAIT_ACON;
464 break;
465 case 0x34:
466 state = OTG_STATE_B_HOST;
467 break;
468
469 /* default-a */
470 case 0x36:
471 state = OTG_STATE_A_IDLE;
472 break;
473 case 0x3c:
474 state = OTG_STATE_A_WAIT_VFALL;
475 break;
476 case 0x7d:
477 state = OTG_STATE_A_VBUS_ERR;
478 break;
479 case 0x9e:
480 case 0x9f:
481 extra = 1;
482 case 0x89:
483 state = OTG_STATE_A_PERIPHERAL;
484 break;
485 case 0xb7:
486 state = OTG_STATE_A_WAIT_VRISE;
487 break;
488 case 0xb8:
489 state = OTG_STATE_A_WAIT_BCON;
490 break;
491 case 0xb9:
492 state = OTG_STATE_A_HOST;
493 break;
494 case 0xba:
495 state = OTG_STATE_A_SUSPEND;
496 break;
497 default:
498 break;
499 }
500 if (isp->otg.state == state && !extra)
501 return;
502 pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
503 state_string(state), fsm, state_name(isp), OTG_CTRL_REG);
504 }
505
506 #else
507
508 static inline void check_state(struct isp1301 *isp, const char *tag) { }
509
510 #endif
511
512 /* outputs from ISP1301_INTERRUPT_SOURCE */
513 static void update_otg1(struct isp1301 *isp, u8 int_src)
514 {
515 u32 otg_ctrl;
516
517 otg_ctrl = OTG_CTRL_REG
518 & OTG_CTRL_MASK
519 & ~OTG_XCEIV_INPUTS
520 & ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
521 if (int_src & INTR_SESS_VLD)
522 otg_ctrl |= OTG_ASESSVLD;
523 else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
524 a_idle(isp, "vfall");
525 otg_ctrl &= ~OTG_CTRL_BITS;
526 }
527 if (int_src & INTR_VBUS_VLD)
528 otg_ctrl |= OTG_VBUSVLD;
529 if (int_src & INTR_ID_GND) { /* default-A */
530 if (isp->otg.state == OTG_STATE_B_IDLE
531 || isp->otg.state == OTG_STATE_UNDEFINED) {
532 a_idle(isp, "init");
533 return;
534 }
535 } else { /* default-B */
536 otg_ctrl |= OTG_ID;
537 if (isp->otg.state == OTG_STATE_A_IDLE
538 || isp->otg.state == OTG_STATE_UNDEFINED) {
539 b_idle(isp, "init");
540 return;
541 }
542 }
543 OTG_CTRL_REG = otg_ctrl;
544 }
545
546 /* outputs from ISP1301_OTG_STATUS */
547 static void update_otg2(struct isp1301 *isp, u8 otg_status)
548 {
549 u32 otg_ctrl;
550
551 otg_ctrl = OTG_CTRL_REG
552 & OTG_CTRL_MASK
553 & ~OTG_XCEIV_INPUTS
554 & ~(OTG_BSESSVLD|OTG_BSESSEND);
555 if (otg_status & OTG_B_SESS_VLD)
556 otg_ctrl |= OTG_BSESSVLD;
557 else if (otg_status & OTG_B_SESS_END)
558 otg_ctrl |= OTG_BSESSEND;
559 OTG_CTRL_REG = otg_ctrl;
560 }
561
562 /* inputs going to ISP1301 */
563 static void otg_update_isp(struct isp1301 *isp)
564 {
565 u32 otg_ctrl, otg_change;
566 u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
567
568 otg_ctrl = OTG_CTRL_REG;
569 otg_change = otg_ctrl ^ isp->last_otg_ctrl;
570 isp->last_otg_ctrl = otg_ctrl;
571 otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
572
573 switch (isp->otg.state) {
574 case OTG_STATE_B_IDLE:
575 case OTG_STATE_B_PERIPHERAL:
576 case OTG_STATE_B_SRP_INIT:
577 if (!(otg_ctrl & OTG_PULLUP)) {
578 // if (otg_ctrl & OTG_B_HNPEN) {
579 if (isp->otg.gadget->b_hnp_enable) {
580 isp->otg.state = OTG_STATE_B_WAIT_ACON;
581 pr_debug(" --> b_wait_acon\n");
582 }
583 goto pulldown;
584 }
585 pullup:
586 set |= OTG1_DP_PULLUP;
587 clr |= OTG1_DP_PULLDOWN;
588 break;
589 case OTG_STATE_A_SUSPEND:
590 case OTG_STATE_A_PERIPHERAL:
591 if (otg_ctrl & OTG_PULLUP)
592 goto pullup;
593 /* FALLTHROUGH */
594 // case OTG_STATE_B_WAIT_ACON:
595 default:
596 pulldown:
597 set |= OTG1_DP_PULLDOWN;
598 clr |= OTG1_DP_PULLUP;
599 break;
600 }
601
602 # define toggle(OTG,ISP) do { \
603 if (otg_ctrl & OTG) set |= ISP; \
604 else clr |= ISP; \
605 } while (0)
606
607 if (!(isp->otg.host))
608 otg_ctrl &= ~OTG_DRV_VBUS;
609
610 switch (isp->otg.state) {
611 case OTG_STATE_A_SUSPEND:
612 if (otg_ctrl & OTG_DRV_VBUS) {
613 set |= OTG1_VBUS_DRV;
614 break;
615 }
616 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
617 notresponding(isp);
618
619 /* FALLTHROUGH */
620 case OTG_STATE_A_VBUS_ERR:
621 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
622 pr_debug(" --> a_wait_vfall\n");
623 /* FALLTHROUGH */
624 case OTG_STATE_A_WAIT_VFALL:
625 /* FIXME usbcore thinks port power is still on ... */
626 clr |= OTG1_VBUS_DRV;
627 break;
628 case OTG_STATE_A_IDLE:
629 if (otg_ctrl & OTG_DRV_VBUS) {
630 isp->otg.state = OTG_STATE_A_WAIT_VRISE;
631 pr_debug(" --> a_wait_vrise\n");
632 }
633 /* FALLTHROUGH */
634 default:
635 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
636 }
637
638 toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
639 toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
640
641 # undef toggle
642
643 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
644 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
645
646 /* HNP switch to host or peripheral; and SRP */
647 if (otg_change & OTG_PULLUP) {
648 switch (isp->otg.state) {
649 case OTG_STATE_B_IDLE:
650 if (clr & OTG1_DP_PULLUP)
651 break;
652 isp->otg.state = OTG_STATE_B_PERIPHERAL;
653 pr_debug(" --> b_peripheral\n");
654 break;
655 case OTG_STATE_A_SUSPEND:
656 if (clr & OTG1_DP_PULLUP)
657 break;
658 isp->otg.state = OTG_STATE_A_PERIPHERAL;
659 pr_debug(" --> a_peripheral\n");
660 break;
661 default:
662 break;
663 }
664 OTG_CTRL_REG |= OTG_PULLUP;
665 }
666
667 check_state(isp, __FUNCTION__);
668 dump_regs(isp, "otg->isp1301");
669 }
670
671 static irqreturn_t omap_otg_irq(int irq, void *_isp)
672 {
673 u16 otg_irq = OTG_IRQ_SRC_REG;
674 u32 otg_ctrl;
675 int ret = IRQ_NONE;
676 struct isp1301 *isp = _isp;
677
678 /* update ISP1301 transciever from OTG controller */
679 if (otg_irq & OPRT_CHG) {
680 OTG_IRQ_SRC_REG = OPRT_CHG;
681 isp1301_defer_work(isp, WORK_UPDATE_ISP);
682 ret = IRQ_HANDLED;
683
684 /* SRP to become b_peripheral failed */
685 } else if (otg_irq & B_SRP_TMROUT) {
686 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", OTG_CTRL_REG);
687 notresponding(isp);
688
689 /* gadget drivers that care should monitor all kinds of
690 * remote wakeup (SRP, normal) using their own timer
691 * to give "check cable and A-device" messages.
692 */
693 if (isp->otg.state == OTG_STATE_B_SRP_INIT)
694 b_idle(isp, "srp_timeout");
695
696 OTG_IRQ_SRC_REG = B_SRP_TMROUT;
697 ret = IRQ_HANDLED;
698
699 /* HNP to become b_host failed */
700 } else if (otg_irq & B_HNP_FAIL) {
701 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
702 state_name(isp), OTG_CTRL_REG);
703 notresponding(isp);
704
705 otg_ctrl = OTG_CTRL_REG;
706 otg_ctrl |= OTG_BUSDROP;
707 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
708 OTG_CTRL_REG = otg_ctrl;
709
710 /* subset of b_peripheral()... */
711 isp->otg.state = OTG_STATE_B_PERIPHERAL;
712 pr_debug(" --> b_peripheral\n");
713
714 OTG_IRQ_SRC_REG = B_HNP_FAIL;
715 ret = IRQ_HANDLED;
716
717 /* detect SRP from B-device ... */
718 } else if (otg_irq & A_SRP_DETECT) {
719 pr_debug("otg: %s SRP_DETECT, %06x\n",
720 state_name(isp), OTG_CTRL_REG);
721
722 isp1301_defer_work(isp, WORK_UPDATE_OTG);
723 switch (isp->otg.state) {
724 case OTG_STATE_A_IDLE:
725 if (!isp->otg.host)
726 break;
727 isp1301_defer_work(isp, WORK_HOST_RESUME);
728 otg_ctrl = OTG_CTRL_REG;
729 otg_ctrl |= OTG_A_BUSREQ;
730 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
731 & ~OTG_XCEIV_INPUTS
732 & OTG_CTRL_MASK;
733 OTG_CTRL_REG = otg_ctrl;
734 break;
735 default:
736 break;
737 }
738
739 OTG_IRQ_SRC_REG = A_SRP_DETECT;
740 ret = IRQ_HANDLED;
741
742 /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise)
743 * we don't track them separately
744 */
745 } else if (otg_irq & A_REQ_TMROUT) {
746 otg_ctrl = OTG_CTRL_REG;
747 pr_info("otg: BCON_TMOUT from %s, %06x\n",
748 state_name(isp), otg_ctrl);
749 notresponding(isp);
750
751 otg_ctrl |= OTG_BUSDROP;
752 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
753 OTG_CTRL_REG = otg_ctrl;
754 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
755
756 OTG_IRQ_SRC_REG = A_REQ_TMROUT;
757 ret = IRQ_HANDLED;
758
759 /* A-supplied voltage fell too low; overcurrent */
760 } else if (otg_irq & A_VBUS_ERR) {
761 otg_ctrl = OTG_CTRL_REG;
762 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
763 state_name(isp), otg_irq, otg_ctrl);
764
765 otg_ctrl |= OTG_BUSDROP;
766 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
767 OTG_CTRL_REG = otg_ctrl;
768 isp->otg.state = OTG_STATE_A_VBUS_ERR;
769
770 OTG_IRQ_SRC_REG = A_VBUS_ERR;
771 ret = IRQ_HANDLED;
772
773 /* switch driver; the transciever code activates it,
774 * ungating the udc clock or resuming OHCI.
775 */
776 } else if (otg_irq & DRIVER_SWITCH) {
777 int kick = 0;
778
779 otg_ctrl = OTG_CTRL_REG;
780 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
781 state_name(isp),
782 (otg_ctrl & OTG_DRIVER_SEL)
783 ? "gadget" : "host",
784 otg_ctrl);
785 isp1301_defer_work(isp, WORK_UPDATE_ISP);
786
787 /* role is peripheral */
788 if (otg_ctrl & OTG_DRIVER_SEL) {
789 switch (isp->otg.state) {
790 case OTG_STATE_A_IDLE:
791 b_idle(isp, __FUNCTION__);
792 break;
793 default:
794 break;
795 }
796 isp1301_defer_work(isp, WORK_UPDATE_ISP);
797
798 /* role is host */
799 } else {
800 if (!(otg_ctrl & OTG_ID)) {
801 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
802 OTG_CTRL_REG = otg_ctrl | OTG_A_BUSREQ;
803 }
804
805 if (isp->otg.host) {
806 switch (isp->otg.state) {
807 case OTG_STATE_B_WAIT_ACON:
808 isp->otg.state = OTG_STATE_B_HOST;
809 pr_debug(" --> b_host\n");
810 kick = 1;
811 break;
812 case OTG_STATE_A_WAIT_BCON:
813 isp->otg.state = OTG_STATE_A_HOST;
814 pr_debug(" --> a_host\n");
815 break;
816 case OTG_STATE_A_PERIPHERAL:
817 isp->otg.state = OTG_STATE_A_WAIT_BCON;
818 pr_debug(" --> a_wait_bcon\n");
819 break;
820 default:
821 break;
822 }
823 isp1301_defer_work(isp, WORK_HOST_RESUME);
824 }
825 }
826
827 OTG_IRQ_SRC_REG = DRIVER_SWITCH;
828 ret = IRQ_HANDLED;
829
830 if (kick)
831 usb_bus_start_enum(isp->otg.host,
832 isp->otg.host->otg_port);
833 }
834
835 check_state(isp, __FUNCTION__);
836 return ret;
837 }
838
839 static struct platform_device *otg_dev;
840
841 static int otg_init(struct isp1301 *isp)
842 {
843 if (!otg_dev)
844 return -ENODEV;
845
846 dump_regs(isp, __FUNCTION__);
847 /* some of these values are board-specific... */
848 OTG_SYSCON_2_REG |= OTG_EN
849 /* for B-device: */
850 | SRP_GPDATA /* 9msec Bdev D+ pulse */
851 | SRP_GPDVBUS /* discharge after VBUS pulse */
852 // | (3 << 24) /* 2msec VBUS pulse */
853 /* for A-device: */
854 | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */
855 | SRP_DPW /* detect 167+ns SRP pulses */
856 | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */
857 ;
858
859 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
860 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
861
862 check_state(isp, __FUNCTION__);
863 pr_debug("otg: %s, %s %06x\n",
864 state_name(isp), __FUNCTION__, OTG_CTRL_REG);
865
866 OTG_IRQ_EN_REG = DRIVER_SWITCH | OPRT_CHG
867 | B_SRP_TMROUT | B_HNP_FAIL
868 | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT;
869 OTG_SYSCON_2_REG |= OTG_EN;
870
871 return 0;
872 }
873
874 static int otg_probe(struct platform_device *dev)
875 {
876 // struct omap_usb_config *config = dev->platform_data;
877
878 otg_dev = dev;
879 return 0;
880 }
881
882 static int otg_remove(struct platform_device *dev)
883 {
884 otg_dev = 0;
885 return 0;
886 }
887
888 struct platform_driver omap_otg_driver = {
889 .probe = otg_probe,
890 .remove = otg_remove,
891 .driver = {
892 .owner = THIS_MODULE,
893 .name = "omap_otg",
894 },
895 };
896
897 static int otg_bind(struct isp1301 *isp)
898 {
899 int status;
900
901 if (otg_dev)
902 return -EBUSY;
903
904 status = platform_driver_register(&omap_otg_driver);
905 if (status < 0)
906 return status;
907
908 if (otg_dev)
909 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
910 IRQF_DISABLED, DRIVER_NAME, isp);
911 else
912 status = -ENODEV;
913
914 if (status < 0)
915 platform_driver_unregister(&omap_otg_driver);
916 return status;
917 }
918
919 static void otg_unbind(struct isp1301 *isp)
920 {
921 if (!otg_dev)
922 return;
923 free_irq(otg_dev->resource[1].start, isp);
924 }
925
926 #else
927
928 /* OTG controller isn't clocked */
929
930 #endif /* CONFIG_USB_OTG */
931
932 /*-------------------------------------------------------------------------*/
933
934 static void b_peripheral(struct isp1301 *isp)
935 {
936 OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
937 usb_gadget_vbus_connect(isp->otg.gadget);
938
939 #ifdef CONFIG_USB_OTG
940 enable_vbus_draw(isp, 8);
941 otg_update_isp(isp);
942 #else
943 enable_vbus_draw(isp, 100);
944 /* UDC driver just set OTG_BSESSVLD */
945 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
946 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
947 isp->otg.state = OTG_STATE_B_PERIPHERAL;
948 pr_debug(" --> b_peripheral\n");
949 dump_regs(isp, "2periph");
950 #endif
951 }
952
953 static void isp_update_otg(struct isp1301 *isp, u8 stat)
954 {
955 u8 isp_stat, isp_bstat;
956 enum usb_otg_state state = isp->otg.state;
957
958 if (stat & INTR_BDIS_ACON)
959 pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp));
960
961 /* start certain state transitions right away */
962 isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
963 if (isp_stat & INTR_ID_GND) {
964 if (isp->otg.default_a) {
965 switch (state) {
966 case OTG_STATE_B_IDLE:
967 a_idle(isp, "idle");
968 /* FALLTHROUGH */
969 case OTG_STATE_A_IDLE:
970 enable_vbus_source(isp);
971 /* FALLTHROUGH */
972 case OTG_STATE_A_WAIT_VRISE:
973 /* we skip over OTG_STATE_A_WAIT_BCON, since
974 * the HC will transition to A_HOST (or
975 * A_SUSPEND!) without our noticing except
976 * when HNP is used.
977 */
978 if (isp_stat & INTR_VBUS_VLD)
979 isp->otg.state = OTG_STATE_A_HOST;
980 break;
981 case OTG_STATE_A_WAIT_VFALL:
982 if (!(isp_stat & INTR_SESS_VLD))
983 a_idle(isp, "vfell");
984 break;
985 default:
986 if (!(isp_stat & INTR_VBUS_VLD))
987 isp->otg.state = OTG_STATE_A_VBUS_ERR;
988 break;
989 }
990 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
991 } else {
992 switch (state) {
993 case OTG_STATE_B_PERIPHERAL:
994 case OTG_STATE_B_HOST:
995 case OTG_STATE_B_WAIT_ACON:
996 usb_gadget_vbus_disconnect(isp->otg.gadget);
997 break;
998 default:
999 break;
1000 }
1001 if (state != OTG_STATE_A_IDLE)
1002 a_idle(isp, "id");
1003 if (isp->otg.host && state == OTG_STATE_A_IDLE)
1004 isp1301_defer_work(isp, WORK_HOST_RESUME);
1005 isp_bstat = 0;
1006 }
1007 } else {
1008 /* if user unplugged mini-A end of cable,
1009 * don't bypass A_WAIT_VFALL.
1010 */
1011 if (isp->otg.default_a) {
1012 switch (state) {
1013 default:
1014 isp->otg.state = OTG_STATE_A_WAIT_VFALL;
1015 break;
1016 case OTG_STATE_A_WAIT_VFALL:
1017 state = OTG_STATE_A_IDLE;
1018 /* khubd may take a while to notice and
1019 * handle this disconnect, so don't go
1020 * to B_IDLE quite yet.
1021 */
1022 break;
1023 case OTG_STATE_A_IDLE:
1024 host_suspend(isp);
1025 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1026 MC1_BDIS_ACON_EN);
1027 isp->otg.state = OTG_STATE_B_IDLE;
1028 OTG_CTRL_REG &= OTG_CTRL_REG & OTG_CTRL_MASK
1029 & ~OTG_CTRL_BITS;
1030 break;
1031 case OTG_STATE_B_IDLE:
1032 break;
1033 }
1034 }
1035 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1036
1037 switch (isp->otg.state) {
1038 case OTG_STATE_B_PERIPHERAL:
1039 case OTG_STATE_B_WAIT_ACON:
1040 case OTG_STATE_B_HOST:
1041 if (likely(isp_bstat & OTG_B_SESS_VLD))
1042 break;
1043 enable_vbus_draw(isp, 0);
1044 #ifndef CONFIG_USB_OTG
1045 /* UDC driver will clear OTG_BSESSVLD */
1046 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1047 OTG1_DP_PULLDOWN);
1048 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1049 OTG1_DP_PULLUP);
1050 dump_regs(isp, __FUNCTION__);
1051 #endif
1052 /* FALLTHROUGH */
1053 case OTG_STATE_B_SRP_INIT:
1054 b_idle(isp, __FUNCTION__);
1055 OTG_CTRL_REG &= OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
1056 /* FALLTHROUGH */
1057 case OTG_STATE_B_IDLE:
1058 if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1059 #ifdef CONFIG_USB_OTG
1060 update_otg1(isp, isp_stat);
1061 update_otg2(isp, isp_bstat);
1062 #endif
1063 b_peripheral(isp);
1064 } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1065 isp_bstat |= OTG_B_SESS_END;
1066 break;
1067 case OTG_STATE_A_WAIT_VFALL:
1068 break;
1069 default:
1070 pr_debug("otg: unsupported b-device %s\n",
1071 state_name(isp));
1072 break;
1073 }
1074 }
1075
1076 if (state != isp->otg.state)
1077 pr_debug(" isp, %s -> %s\n",
1078 state_string(state), state_name(isp));
1079
1080 #ifdef CONFIG_USB_OTG
1081 /* update the OTG controller state to match the isp1301; may
1082 * trigger OPRT_CHG irqs for changes going to the isp1301.
1083 */
1084 update_otg1(isp, isp_stat);
1085 update_otg2(isp, isp_bstat);
1086 check_state(isp, __FUNCTION__);
1087 #endif
1088
1089 dump_regs(isp, "isp1301->otg");
1090 }
1091
1092 /*-------------------------------------------------------------------------*/
1093
1094 static u8 isp1301_clear_latch(struct isp1301 *isp)
1095 {
1096 u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1097 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1098 return latch;
1099 }
1100
1101 static void
1102 isp1301_work(struct work_struct *work)
1103 {
1104 struct isp1301 *isp = container_of(work, struct isp1301, work);
1105 int stop;
1106
1107 /* implicit lock: we're the only task using this device */
1108 isp->working = 1;
1109 do {
1110 stop = test_bit(WORK_STOP, &isp->todo);
1111
1112 #ifdef CONFIG_USB_OTG
1113 /* transfer state from otg engine to isp1301 */
1114 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1115 otg_update_isp(isp);
1116 put_device(&isp->client.dev);
1117 }
1118 #endif
1119 /* transfer state from isp1301 to otg engine */
1120 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1121 u8 stat = isp1301_clear_latch(isp);
1122
1123 isp_update_otg(isp, stat);
1124 put_device(&isp->client.dev);
1125 }
1126
1127 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1128 u32 otg_ctrl;
1129
1130 /*
1131 * skip A_WAIT_VRISE; hc transitions invisibly
1132 * skip A_WAIT_BCON; same.
1133 */
1134 switch (isp->otg.state) {
1135 case OTG_STATE_A_WAIT_BCON:
1136 case OTG_STATE_A_WAIT_VRISE:
1137 isp->otg.state = OTG_STATE_A_HOST;
1138 pr_debug(" --> a_host\n");
1139 otg_ctrl = OTG_CTRL_REG;
1140 otg_ctrl |= OTG_A_BUSREQ;
1141 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1142 & OTG_CTRL_MASK;
1143 OTG_CTRL_REG = otg_ctrl;
1144 break;
1145 case OTG_STATE_B_WAIT_ACON:
1146 isp->otg.state = OTG_STATE_B_HOST;
1147 pr_debug(" --> b_host (acon)\n");
1148 break;
1149 case OTG_STATE_B_HOST:
1150 case OTG_STATE_B_IDLE:
1151 case OTG_STATE_A_IDLE:
1152 break;
1153 default:
1154 pr_debug(" host resume in %s\n",
1155 state_name(isp));
1156 }
1157 host_resume(isp);
1158 // mdelay(10);
1159 put_device(&isp->client.dev);
1160 }
1161
1162 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1163 #ifdef VERBOSE
1164 dump_regs(isp, "timer");
1165 if (!stop)
1166 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1167 #endif
1168 put_device(&isp->client.dev);
1169 }
1170
1171 if (isp->todo)
1172 dev_vdbg(&isp->client.dev,
1173 "work done, todo = 0x%lx\n",
1174 isp->todo);
1175 if (stop) {
1176 dev_dbg(&isp->client.dev, "stop\n");
1177 break;
1178 }
1179 } while (isp->todo);
1180 isp->working = 0;
1181 }
1182
1183 static irqreturn_t isp1301_irq(int irq, void *isp)
1184 {
1185 isp1301_defer_work(isp, WORK_UPDATE_OTG);
1186 return IRQ_HANDLED;
1187 }
1188
1189 static void isp1301_timer(unsigned long _isp)
1190 {
1191 isp1301_defer_work((void *)_isp, WORK_TIMER);
1192 }
1193
1194 /*-------------------------------------------------------------------------*/
1195
1196 static void isp1301_release(struct device *dev)
1197 {
1198 struct isp1301 *isp;
1199
1200 isp = container_of(dev, struct isp1301, client.dev);
1201
1202 /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1203 if (isp->i2c_release)
1204 isp->i2c_release(dev);
1205 kfree (isp);
1206 }
1207
1208 static struct isp1301 *the_transceiver;
1209
1210 static int isp1301_detach_client(struct i2c_client *i2c)
1211 {
1212 struct isp1301 *isp;
1213
1214 isp = container_of(i2c, struct isp1301, client);
1215
1216 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1217 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1218 free_irq(isp->irq, isp);
1219 #ifdef CONFIG_USB_OTG
1220 otg_unbind(isp);
1221 #endif
1222 if (machine_is_omap_h2())
1223 omap_free_gpio(2);
1224
1225 isp->timer.data = 0;
1226 set_bit(WORK_STOP, &isp->todo);
1227 del_timer_sync(&isp->timer);
1228 flush_scheduled_work();
1229
1230 put_device(&i2c->dev);
1231 the_transceiver = 0;
1232
1233 return i2c_detach_client(i2c);
1234 }
1235
1236 /*-------------------------------------------------------------------------*/
1237
1238 /* NOTE: three modes are possible here, only one of which
1239 * will be standards-conformant on any given system:
1240 *
1241 * - OTG mode (dual-role), required if there's a Mini-AB connector
1242 * - HOST mode, for when there's one or more A (host) connectors
1243 * - DEVICE mode, for when there's a B/Mini-B (device) connector
1244 *
1245 * As a rule, you won't have an isp1301 chip unless it's there to
1246 * support the OTG mode. Other modes help testing USB controllers
1247 * in isolation from (full) OTG support, or maybe so later board
1248 * revisions can help to support those feature.
1249 */
1250
1251 #ifdef CONFIG_USB_OTG
1252
1253 static int isp1301_otg_enable(struct isp1301 *isp)
1254 {
1255 power_up(isp);
1256 otg_init(isp);
1257
1258 /* NOTE: since we don't change this, this provides
1259 * a few more interrupts than are strictly needed.
1260 */
1261 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1262 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1263 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1264 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1265
1266 dev_info(&isp->client.dev, "ready for dual-role USB ...\n");
1267
1268 return 0;
1269 }
1270
1271 #endif
1272
1273 /* add or disable the host device+driver */
1274 static int
1275 isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
1276 {
1277 struct isp1301 *isp = container_of(otg, struct isp1301, otg);
1278
1279 if (!otg || isp != the_transceiver)
1280 return -ENODEV;
1281
1282 if (!host) {
1283 OTG_IRQ_EN_REG = 0;
1284 power_down(isp);
1285 isp->otg.host = 0;
1286 return 0;
1287 }
1288
1289 #ifdef CONFIG_USB_OTG
1290 isp->otg.host = host;
1291 dev_dbg(&isp->client.dev, "registered host\n");
1292 host_suspend(isp);
1293 if (isp->otg.gadget)
1294 return isp1301_otg_enable(isp);
1295 return 0;
1296
1297 #elif !defined(CONFIG_USB_GADGET_OMAP)
1298 // FIXME update its refcount
1299 isp->otg.host = host;
1300
1301 power_up(isp);
1302
1303 if (machine_is_omap_h2())
1304 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1305
1306 dev_info(&isp->client.dev, "A-Host sessions ok\n");
1307 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1308 INTR_ID_GND);
1309 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1310 INTR_ID_GND);
1311
1312 /* If this has a Mini-AB connector, this mode is highly
1313 * nonstandard ... but can be handy for testing, especially with
1314 * the Mini-A end of an OTG cable. (Or something nonstandard
1315 * like MiniB-to-StandardB, maybe built with a gender mender.)
1316 */
1317 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1318
1319 dump_regs(isp, __FUNCTION__);
1320
1321 return 0;
1322
1323 #else
1324 dev_dbg(&isp->client.dev, "host sessions not allowed\n");
1325 return -EINVAL;
1326 #endif
1327
1328 }
1329
1330 static int
1331 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
1332 {
1333 struct isp1301 *isp = container_of(otg, struct isp1301, otg);
1334
1335 if (!otg || isp != the_transceiver)
1336 return -ENODEV;
1337
1338 if (!gadget) {
1339 OTG_IRQ_EN_REG = 0;
1340 if (!isp->otg.default_a)
1341 enable_vbus_draw(isp, 0);
1342 usb_gadget_vbus_disconnect(isp->otg.gadget);
1343 isp->otg.gadget = 0;
1344 power_down(isp);
1345 return 0;
1346 }
1347
1348 #ifdef CONFIG_USB_OTG
1349 isp->otg.gadget = gadget;
1350 dev_dbg(&isp->client.dev, "registered gadget\n");
1351 /* gadget driver may be suspended until vbus_connect () */
1352 if (isp->otg.host)
1353 return isp1301_otg_enable(isp);
1354 return 0;
1355
1356 #elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1357 isp->otg.gadget = gadget;
1358 // FIXME update its refcount
1359
1360 OTG_CTRL_REG = (OTG_CTRL_REG & OTG_CTRL_MASK
1361 & ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS))
1362 | OTG_ID;
1363 power_up(isp);
1364 isp->otg.state = OTG_STATE_B_IDLE;
1365
1366 if (machine_is_omap_h2())
1367 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1368
1369 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1370 INTR_SESS_VLD);
1371 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1372 INTR_VBUS_VLD);
1373 dev_info(&isp->client.dev, "B-Peripheral sessions ok\n");
1374 dump_regs(isp, __FUNCTION__);
1375
1376 /* If this has a Mini-AB connector, this mode is highly
1377 * nonstandard ... but can be handy for testing, so long
1378 * as you don't plug a Mini-A cable into the jack.
1379 */
1380 if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1381 b_peripheral(isp);
1382
1383 return 0;
1384
1385 #else
1386 dev_dbg(&isp->client.dev, "peripheral sessions not allowed\n");
1387 return -EINVAL;
1388 #endif
1389 }
1390
1391
1392 /*-------------------------------------------------------------------------*/
1393
1394 static int
1395 isp1301_set_power(struct otg_transceiver *dev, unsigned mA)
1396 {
1397 if (!the_transceiver)
1398 return -ENODEV;
1399 if (dev->state == OTG_STATE_B_PERIPHERAL)
1400 enable_vbus_draw(the_transceiver, mA);
1401 return 0;
1402 }
1403
1404 static int
1405 isp1301_start_srp(struct otg_transceiver *dev)
1406 {
1407 struct isp1301 *isp = container_of(dev, struct isp1301, otg);
1408 u32 otg_ctrl;
1409
1410 if (!dev || isp != the_transceiver
1411 || isp->otg.state != OTG_STATE_B_IDLE)
1412 return -ENODEV;
1413
1414 otg_ctrl = OTG_CTRL_REG;
1415 if (!(otg_ctrl & OTG_BSESSEND))
1416 return -EINVAL;
1417
1418 otg_ctrl |= OTG_B_BUSREQ;
1419 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1420 OTG_CTRL_REG = otg_ctrl;
1421 isp->otg.state = OTG_STATE_B_SRP_INIT;
1422
1423 pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), OTG_CTRL_REG);
1424 #ifdef CONFIG_USB_OTG
1425 check_state(isp, __FUNCTION__);
1426 #endif
1427 return 0;
1428 }
1429
1430 static int
1431 isp1301_start_hnp(struct otg_transceiver *dev)
1432 {
1433 #ifdef CONFIG_USB_OTG
1434 struct isp1301 *isp = container_of(dev, struct isp1301, otg);
1435
1436 if (!dev || isp != the_transceiver)
1437 return -ENODEV;
1438 if (isp->otg.default_a && (isp->otg.host == NULL
1439 || !isp->otg.host->b_hnp_enable))
1440 return -ENOTCONN;
1441 if (!isp->otg.default_a && (isp->otg.gadget == NULL
1442 || !isp->otg.gadget->b_hnp_enable))
1443 return -ENOTCONN;
1444
1445 /* We want hardware to manage most HNP protocol timings.
1446 * So do this part as early as possible...
1447 */
1448 switch (isp->otg.state) {
1449 case OTG_STATE_B_HOST:
1450 isp->otg.state = OTG_STATE_B_PERIPHERAL;
1451 /* caller will suspend next */
1452 break;
1453 case OTG_STATE_A_HOST:
1454 #if 0
1455 /* autoconnect mode avoids irq latency bugs */
1456 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1457 MC1_BDIS_ACON_EN);
1458 #endif
1459 /* caller must suspend then clear A_BUSREQ */
1460 usb_gadget_vbus_connect(isp->otg.gadget);
1461 OTG_CTRL_REG |= OTG_A_SETB_HNPEN;
1462
1463 break;
1464 case OTG_STATE_A_PERIPHERAL:
1465 /* initiated by B-Host suspend */
1466 break;
1467 default:
1468 return -EILSEQ;
1469 }
1470 pr_debug("otg: HNP %s, %06x ...\n",
1471 state_name(isp), OTG_CTRL_REG);
1472 check_state(isp, __FUNCTION__);
1473 return 0;
1474 #else
1475 /* srp-only */
1476 return -EINVAL;
1477 #endif
1478 }
1479
1480 /*-------------------------------------------------------------------------*/
1481
1482 /* no error returns, they'd just make bus scanning stop */
1483 static int isp1301_probe(struct i2c_adapter *bus, int address, int kind)
1484 {
1485 int status;
1486 struct isp1301 *isp;
1487 struct i2c_client *i2c;
1488
1489 if (the_transceiver)
1490 return 0;
1491
1492 isp = kzalloc(sizeof *isp, GFP_KERNEL);
1493 if (!isp)
1494 return 0;
1495
1496 INIT_WORK(&isp->work, isp1301_work);
1497 init_timer(&isp->timer);
1498 isp->timer.function = isp1301_timer;
1499 isp->timer.data = (unsigned long) isp;
1500
1501 isp->irq = -1;
1502 isp->client.addr = address;
1503 i2c_set_clientdata(&isp->client, isp);
1504 isp->client.adapter = bus;
1505 isp->client.driver = &isp1301_driver;
1506 strlcpy(isp->client.name, DRIVER_NAME, I2C_NAME_SIZE);
1507 i2c = &isp->client;
1508
1509 /* if this is a true probe, verify the chip ... */
1510 if (kind < 0) {
1511 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1512 if (status != I2C_VENDOR_ID_PHILIPS) {
1513 dev_dbg(&bus->dev, "addr %d not philips id: %d\n",
1514 address, status);
1515 goto fail1;
1516 }
1517 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1518 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1519 dev_dbg(&bus->dev, "%d not isp1301, %d\n",
1520 address, status);
1521 goto fail1;
1522 }
1523 }
1524
1525 status = i2c_attach_client(i2c);
1526 if (status < 0) {
1527 dev_dbg(&bus->dev, "can't attach %s to device %d, err %d\n",
1528 DRIVER_NAME, address, status);
1529 fail1:
1530 kfree(isp);
1531 return 0;
1532 }
1533 isp->i2c_release = i2c->dev.release;
1534 i2c->dev.release = isp1301_release;
1535
1536 /* initial development used chiprev 2.00 */
1537 status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1538 dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1539 status >> 8, status & 0xff);
1540
1541 /* make like power-on reset */
1542 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1543
1544 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1545 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1546
1547 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1548 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1549 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1550 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1551
1552 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1553 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1554 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1555
1556 #ifdef CONFIG_USB_OTG
1557 status = otg_bind(isp);
1558 if (status < 0) {
1559 dev_dbg(&i2c->dev, "can't bind OTG\n");
1560 goto fail2;
1561 }
1562 #endif
1563
1564 if (machine_is_omap_h2()) {
1565 /* full speed signaling by default */
1566 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1567 MC1_SPEED_REG);
1568 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1569 MC2_SPD_SUSP_CTRL);
1570
1571 /* IRQ wired at M14 */
1572 omap_cfg_reg(M14_1510_GPIO2);
1573 isp->irq = OMAP_GPIO_IRQ(2);
1574 if (gpio_request(2, "isp1301") == 0)
1575 gpio_direction_input(2);
1576 isp->irq_type = IRQF_TRIGGER_FALLING;
1577 }
1578
1579 isp->irq_type |= IRQF_SAMPLE_RANDOM;
1580 status = request_irq(isp->irq, isp1301_irq,
1581 isp->irq_type, 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 .driver = {
1635 .name = "isp1301_omap",
1636 },
1637 .attach_adapter = isp1301_scan_bus,
1638 .detach_client = isp1301_detach_client,
1639 };
1640
1641 /*-------------------------------------------------------------------------*/
1642
1643 static int __init isp_init(void)
1644 {
1645 return i2c_add_driver(&isp1301_driver);
1646 }
1647 module_init(isp_init);
1648
1649 static void __exit isp_exit(void)
1650 {
1651 if (the_transceiver)
1652 otg_set_transceiver(0);
1653 i2c_del_driver(&isp1301_driver);
1654 }
1655 module_exit(isp_exit);
1656
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