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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller
4 *
5 * Copyright (C) 2004 Texas Instruments
6 * Copyright (C) 2004 David Brownell
7 */
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/slab.h>
13#include <linux/interrupt.h>
14#include <linux/platform_device.h>
15#include <linux/gpio/consumer.h>
16#include <linux/usb/ch9.h>
17#include <linux/usb/gadget.h>
18#include <linux/usb.h>
19#include <linux/usb/otg.h>
20#include <linux/i2c.h>
21#include <linux/workqueue.h>
22
23#include <asm/irq.h>
24#include <asm/mach-types.h>
25
26#include <linux/soc/ti/omap1-mux.h>
27#include <linux/soc/ti/omap1-usb.h>
28#include <linux/soc/ti/omap1-io.h>
29
30#undef VERBOSE
31
32
33#define DRIVER_VERSION "24 August 2004"
34#define DRIVER_NAME (isp1301_driver.driver.name)
35
36MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
37MODULE_LICENSE("GPL");
38
39struct isp1301 {
40 struct usb_phy phy;
41 struct i2c_client *client;
42 void (*i2c_release)(struct device *dev);
43
44 int irq_type;
45
46 u32 last_otg_ctrl;
47 unsigned working:1;
48
49 struct timer_list timer;
50
51 /* use keventd context to change the state for us */
52 struct work_struct work;
53
54 unsigned long todo;
55# define WORK_UPDATE_ISP 0 /* update ISP from OTG */
56# define WORK_UPDATE_OTG 1 /* update OTG from ISP */
57# define WORK_HOST_RESUME 4 /* resume host */
58# define WORK_TIMER 6 /* timer fired */
59# define WORK_STOP 7 /* don't resubmit */
60};
61
62
63/* bits in OTG_CTRL */
64
65#define OTG_XCEIV_OUTPUTS \
66 (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
67#define OTG_XCEIV_INPUTS \
68 (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
69#define OTG_CTRL_BITS \
70 (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP)
71 /* and OTG_PULLUP is sometimes written */
72
73#define OTG_CTRL_MASK (OTG_DRIVER_SEL| \
74 OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \
75 OTG_CTRL_BITS)
76
77
78/*-------------------------------------------------------------------------*/
79
80/* board-specific PM hooks */
81
82#if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3)
83
84#if IS_REACHABLE(CONFIG_TPS65010)
85
86#include <linux/mfd/tps65010.h>
87
88#else
89
90static inline int tps65010_set_vbus_draw(unsigned mA)
91{
92 pr_debug("tps65010: draw %d mA (STUB)\n", mA);
93 return 0;
94}
95
96#endif
97
98static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
99{
100 int status = tps65010_set_vbus_draw(mA);
101 if (status < 0)
102 pr_debug(" VBUS %d mA error %d\n", mA, status);
103}
104
105#else
106
107static void enable_vbus_draw(struct isp1301 *isp, unsigned mA)
108{
109 /* H4 controls this by DIP switch S2.4; no soft control.
110 * ON means the charger is always enabled. Leave it OFF
111 * unless the OTG port is used only in B-peripheral mode.
112 */
113}
114
115#endif
116
117static void enable_vbus_source(struct isp1301 *isp)
118{
119 /* this board won't supply more than 8mA vbus power.
120 * some boards can switch a 100ma "unit load" (or more).
121 */
122}
123
124
125/* products will deliver OTG messages with LEDs, GUI, etc */
126static inline void notresponding(struct isp1301 *isp)
127{
128 printk(KERN_NOTICE "OTG device not responding.\n");
129}
130
131
132/*-------------------------------------------------------------------------*/
133
134static struct i2c_driver isp1301_driver;
135
136/* smbus apis are used for portability */
137
138static inline u8
139isp1301_get_u8(struct isp1301 *isp, u8 reg)
140{
141 return i2c_smbus_read_byte_data(isp->client, reg + 0);
142}
143
144static inline int
145isp1301_get_u16(struct isp1301 *isp, u8 reg)
146{
147 return i2c_smbus_read_word_data(isp->client, reg);
148}
149
150static inline int
151isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
152{
153 return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
154}
155
156static inline int
157isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
158{
159 return i2c_smbus_write_byte_data(isp->client, reg + 1, bits);
160}
161
162/*-------------------------------------------------------------------------*/
163
164/* identification */
165#define ISP1301_VENDOR_ID 0x00 /* u16 read */
166#define ISP1301_PRODUCT_ID 0x02 /* u16 read */
167#define ISP1301_BCD_DEVICE 0x14 /* u16 read */
168
169#define I2C_VENDOR_ID_PHILIPS 0x04cc
170#define I2C_PRODUCT_ID_PHILIPS_1301 0x1301
171
172/* operational registers */
173#define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */
174# define MC1_SPEED (1 << 0)
175# define MC1_SUSPEND (1 << 1)
176# define MC1_DAT_SE0 (1 << 2)
177# define MC1_TRANSPARENT (1 << 3)
178# define MC1_BDIS_ACON_EN (1 << 4)
179# define MC1_OE_INT_EN (1 << 5)
180# define MC1_UART_EN (1 << 6)
181# define MC1_MASK 0x7f
182#define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */
183# define MC2_GLOBAL_PWR_DN (1 << 0)
184# define MC2_SPD_SUSP_CTRL (1 << 1)
185# define MC2_BI_DI (1 << 2)
186# define MC2_TRANSP_BDIR0 (1 << 3)
187# define MC2_TRANSP_BDIR1 (1 << 4)
188# define MC2_AUDIO_EN (1 << 5)
189# define MC2_PSW_EN (1 << 6)
190# define MC2_EN2V7 (1 << 7)
191#define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */
192# define OTG1_DP_PULLUP (1 << 0)
193# define OTG1_DM_PULLUP (1 << 1)
194# define OTG1_DP_PULLDOWN (1 << 2)
195# define OTG1_DM_PULLDOWN (1 << 3)
196# define OTG1_ID_PULLDOWN (1 << 4)
197# define OTG1_VBUS_DRV (1 << 5)
198# define OTG1_VBUS_DISCHRG (1 << 6)
199# define OTG1_VBUS_CHRG (1 << 7)
200#define ISP1301_OTG_STATUS 0x10 /* u8 readonly */
201# define OTG_B_SESS_END (1 << 6)
202# define OTG_B_SESS_VLD (1 << 7)
203
204#define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */
205#define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */
206
207#define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */
208#define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */
209
210/* same bitfields in all interrupt registers */
211# define INTR_VBUS_VLD (1 << 0)
212# define INTR_SESS_VLD (1 << 1)
213# define INTR_DP_HI (1 << 2)
214# define INTR_ID_GND (1 << 3)
215# define INTR_DM_HI (1 << 4)
216# define INTR_ID_FLOAT (1 << 5)
217# define INTR_BDIS_ACON (1 << 6)
218# define INTR_CR_INT (1 << 7)
219
220/*-------------------------------------------------------------------------*/
221
222static inline const char *state_name(struct isp1301 *isp)
223{
224 return usb_otg_state_string(isp->phy.otg->state);
225}
226
227/*-------------------------------------------------------------------------*/
228
229/* NOTE: some of this ISP1301 setup is specific to H2 boards;
230 * not everything is guarded by board-specific checks, or even using
231 * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI.
232 *
233 * ALSO: this currently doesn't use ISP1301 low-power modes
234 * while OTG is running.
235 */
236
237static void power_down(struct isp1301 *isp)
238{
239 isp->phy.otg->state = OTG_STATE_UNDEFINED;
240
241 // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
242 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
243
244 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
245 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
246}
247
248static void __maybe_unused power_up(struct isp1301 *isp)
249{
250 // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
251 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
252
253 /* do this only when cpu is driving transceiver,
254 * so host won't see a low speed device...
255 */
256 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
257}
258
259#define NO_HOST_SUSPEND
260
261static int host_suspend(struct isp1301 *isp)
262{
263#ifdef NO_HOST_SUSPEND
264 return 0;
265#else
266 struct device *dev;
267
268 if (!isp->phy.otg->host)
269 return -ENODEV;
270
271 /* Currently ASSUMES only the OTG port matters;
272 * other ports could be active...
273 */
274 dev = isp->phy.otg->host->controller;
275 return dev->driver->suspend(dev, 3, 0);
276#endif
277}
278
279static int host_resume(struct isp1301 *isp)
280{
281#ifdef NO_HOST_SUSPEND
282 return 0;
283#else
284 struct device *dev;
285
286 if (!isp->phy.otg->host)
287 return -ENODEV;
288
289 dev = isp->phy.otg->host->controller;
290 return dev->driver->resume(dev, 0);
291#endif
292}
293
294static int gadget_suspend(struct isp1301 *isp)
295{
296 isp->phy.otg->gadget->b_hnp_enable = 0;
297 isp->phy.otg->gadget->a_hnp_support = 0;
298 isp->phy.otg->gadget->a_alt_hnp_support = 0;
299 return usb_gadget_vbus_disconnect(isp->phy.otg->gadget);
300}
301
302/*-------------------------------------------------------------------------*/
303
304#define TIMER_MINUTES 10
305#define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ)
306
307/* Almost all our I2C messaging comes from a work queue's task context.
308 * NOTE: guaranteeing certain response times might mean we shouldn't
309 * share keventd's work queue; a realtime task might be safest.
310 */
311static void isp1301_defer_work(struct isp1301 *isp, int work)
312{
313 int status;
314
315 if (isp && !test_and_set_bit(work, &isp->todo)) {
316 (void) get_device(&isp->client->dev);
317 status = schedule_work(&isp->work);
318 if (!status && !isp->working)
319 dev_vdbg(&isp->client->dev,
320 "work item %d may be lost\n", work);
321 }
322}
323
324/* called from irq handlers */
325static void a_idle(struct isp1301 *isp, const char *tag)
326{
327 u32 l;
328
329 if (isp->phy.otg->state == OTG_STATE_A_IDLE)
330 return;
331
332 isp->phy.otg->default_a = 1;
333 if (isp->phy.otg->host) {
334 isp->phy.otg->host->is_b_host = 0;
335 host_suspend(isp);
336 }
337 if (isp->phy.otg->gadget) {
338 isp->phy.otg->gadget->is_a_peripheral = 1;
339 gadget_suspend(isp);
340 }
341 isp->phy.otg->state = OTG_STATE_A_IDLE;
342 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
343 omap_writel(l, OTG_CTRL);
344 isp->last_otg_ctrl = l;
345 pr_debug(" --> %s/%s\n", state_name(isp), tag);
346}
347
348/* called from irq handlers */
349static void b_idle(struct isp1301 *isp, const char *tag)
350{
351 u32 l;
352
353 if (isp->phy.otg->state == OTG_STATE_B_IDLE)
354 return;
355
356 isp->phy.otg->default_a = 0;
357 if (isp->phy.otg->host) {
358 isp->phy.otg->host->is_b_host = 1;
359 host_suspend(isp);
360 }
361 if (isp->phy.otg->gadget) {
362 isp->phy.otg->gadget->is_a_peripheral = 0;
363 gadget_suspend(isp);
364 }
365 isp->phy.otg->state = OTG_STATE_B_IDLE;
366 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
367 omap_writel(l, OTG_CTRL);
368 isp->last_otg_ctrl = l;
369 pr_debug(" --> %s/%s\n", state_name(isp), tag);
370}
371
372static void
373dump_regs(struct isp1301 *isp, const char *label)
374{
375 u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1);
376 u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
377 u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
378
379 pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
380 omap_readl(OTG_CTRL), label, state_name(isp),
381 ctrl, status, src);
382 /* mode control and irq enables don't change much */
383}
384
385/*-------------------------------------------------------------------------*/
386
387#ifdef CONFIG_USB_OTG
388
389/*
390 * The OMAP OTG controller handles most of the OTG state transitions.
391 *
392 * We translate isp1301 outputs (mostly voltage comparator status) into
393 * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state
394 * flags into isp1301 inputs ... and infer state transitions.
395 */
396
397#ifdef VERBOSE
398
399static void check_state(struct isp1301 *isp, const char *tag)
400{
401 enum usb_otg_state state = OTG_STATE_UNDEFINED;
402 u8 fsm = omap_readw(OTG_TEST) & 0x0ff;
403 unsigned extra = 0;
404
405 switch (fsm) {
406
407 /* default-b */
408 case 0x0:
409 state = OTG_STATE_B_IDLE;
410 break;
411 case 0x3:
412 case 0x7:
413 extra = 1;
414 case 0x1:
415 state = OTG_STATE_B_PERIPHERAL;
416 break;
417 case 0x11:
418 state = OTG_STATE_B_SRP_INIT;
419 break;
420
421 /* extra dual-role default-b states */
422 case 0x12:
423 case 0x13:
424 case 0x16:
425 extra = 1;
426 case 0x17:
427 state = OTG_STATE_B_WAIT_ACON;
428 break;
429 case 0x34:
430 state = OTG_STATE_B_HOST;
431 break;
432
433 /* default-a */
434 case 0x36:
435 state = OTG_STATE_A_IDLE;
436 break;
437 case 0x3c:
438 state = OTG_STATE_A_WAIT_VFALL;
439 break;
440 case 0x7d:
441 state = OTG_STATE_A_VBUS_ERR;
442 break;
443 case 0x9e:
444 case 0x9f:
445 extra = 1;
446 case 0x89:
447 state = OTG_STATE_A_PERIPHERAL;
448 break;
449 case 0xb7:
450 state = OTG_STATE_A_WAIT_VRISE;
451 break;
452 case 0xb8:
453 state = OTG_STATE_A_WAIT_BCON;
454 break;
455 case 0xb9:
456 state = OTG_STATE_A_HOST;
457 break;
458 case 0xba:
459 state = OTG_STATE_A_SUSPEND;
460 break;
461 default:
462 break;
463 }
464 if (isp->phy.otg->state == state && !extra)
465 return;
466 pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
467 usb_otg_state_string(state), fsm, state_name(isp),
468 omap_readl(OTG_CTRL));
469}
470
471#else
472
473static inline void check_state(struct isp1301 *isp, const char *tag) { }
474
475#endif
476
477/* outputs from ISP1301_INTERRUPT_SOURCE */
478static void update_otg1(struct isp1301 *isp, u8 int_src)
479{
480 u32 otg_ctrl;
481
482 otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
483 otg_ctrl &= ~OTG_XCEIV_INPUTS;
484 otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
485
486 if (int_src & INTR_SESS_VLD)
487 otg_ctrl |= OTG_ASESSVLD;
488 else if (isp->phy.otg->state == OTG_STATE_A_WAIT_VFALL) {
489 a_idle(isp, "vfall");
490 otg_ctrl &= ~OTG_CTRL_BITS;
491 }
492 if (int_src & INTR_VBUS_VLD)
493 otg_ctrl |= OTG_VBUSVLD;
494 if (int_src & INTR_ID_GND) { /* default-A */
495 if (isp->phy.otg->state == OTG_STATE_B_IDLE
496 || isp->phy.otg->state
497 == OTG_STATE_UNDEFINED) {
498 a_idle(isp, "init");
499 return;
500 }
501 } else { /* default-B */
502 otg_ctrl |= OTG_ID;
503 if (isp->phy.otg->state == OTG_STATE_A_IDLE
504 || isp->phy.otg->state == OTG_STATE_UNDEFINED) {
505 b_idle(isp, "init");
506 return;
507 }
508 }
509 omap_writel(otg_ctrl, OTG_CTRL);
510}
511
512/* outputs from ISP1301_OTG_STATUS */
513static void update_otg2(struct isp1301 *isp, u8 otg_status)
514{
515 u32 otg_ctrl;
516
517 otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
518 otg_ctrl &= ~OTG_XCEIV_INPUTS;
519 otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
520 if (otg_status & OTG_B_SESS_VLD)
521 otg_ctrl |= OTG_BSESSVLD;
522 else if (otg_status & OTG_B_SESS_END)
523 otg_ctrl |= OTG_BSESSEND;
524 omap_writel(otg_ctrl, OTG_CTRL);
525}
526
527/* inputs going to ISP1301 */
528static void otg_update_isp(struct isp1301 *isp)
529{
530 u32 otg_ctrl, otg_change;
531 u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
532
533 otg_ctrl = omap_readl(OTG_CTRL);
534 otg_change = otg_ctrl ^ isp->last_otg_ctrl;
535 isp->last_otg_ctrl = otg_ctrl;
536 otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
537
538 switch (isp->phy.otg->state) {
539 case OTG_STATE_B_IDLE:
540 case OTG_STATE_B_PERIPHERAL:
541 case OTG_STATE_B_SRP_INIT:
542 if (!(otg_ctrl & OTG_PULLUP)) {
543 // if (otg_ctrl & OTG_B_HNPEN) {
544 if (isp->phy.otg->gadget->b_hnp_enable) {
545 isp->phy.otg->state = OTG_STATE_B_WAIT_ACON;
546 pr_debug(" --> b_wait_acon\n");
547 }
548 goto pulldown;
549 }
550pullup:
551 set |= OTG1_DP_PULLUP;
552 clr |= OTG1_DP_PULLDOWN;
553 break;
554 case OTG_STATE_A_SUSPEND:
555 case OTG_STATE_A_PERIPHERAL:
556 if (otg_ctrl & OTG_PULLUP)
557 goto pullup;
558 fallthrough;
559 // case OTG_STATE_B_WAIT_ACON:
560 default:
561pulldown:
562 set |= OTG1_DP_PULLDOWN;
563 clr |= OTG1_DP_PULLUP;
564 break;
565 }
566
567# define toggle(OTG,ISP) do { \
568 if (otg_ctrl & OTG) set |= ISP; \
569 else clr |= ISP; \
570 } while (0)
571
572 if (!(isp->phy.otg->host))
573 otg_ctrl &= ~OTG_DRV_VBUS;
574
575 switch (isp->phy.otg->state) {
576 case OTG_STATE_A_SUSPEND:
577 if (otg_ctrl & OTG_DRV_VBUS) {
578 set |= OTG1_VBUS_DRV;
579 break;
580 }
581 /* HNP failed for some reason (A_AIDL_BDIS timeout) */
582 notresponding(isp);
583
584 fallthrough;
585 case OTG_STATE_A_VBUS_ERR:
586 isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
587 pr_debug(" --> a_wait_vfall\n");
588 fallthrough;
589 case OTG_STATE_A_WAIT_VFALL:
590 /* FIXME usbcore thinks port power is still on ... */
591 clr |= OTG1_VBUS_DRV;
592 break;
593 case OTG_STATE_A_IDLE:
594 if (otg_ctrl & OTG_DRV_VBUS) {
595 isp->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
596 pr_debug(" --> a_wait_vrise\n");
597 }
598 fallthrough;
599 default:
600 toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV);
601 }
602
603 toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG);
604 toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG);
605
606# undef toggle
607
608 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set);
609 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr);
610
611 /* HNP switch to host or peripheral; and SRP */
612 if (otg_change & OTG_PULLUP) {
613 u32 l;
614
615 switch (isp->phy.otg->state) {
616 case OTG_STATE_B_IDLE:
617 if (clr & OTG1_DP_PULLUP)
618 break;
619 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL;
620 pr_debug(" --> b_peripheral\n");
621 break;
622 case OTG_STATE_A_SUSPEND:
623 if (clr & OTG1_DP_PULLUP)
624 break;
625 isp->phy.otg->state = OTG_STATE_A_PERIPHERAL;
626 pr_debug(" --> a_peripheral\n");
627 break;
628 default:
629 break;
630 }
631 l = omap_readl(OTG_CTRL);
632 l |= OTG_PULLUP;
633 omap_writel(l, OTG_CTRL);
634 }
635
636 check_state(isp, __func__);
637 dump_regs(isp, "otg->isp1301");
638}
639
640static irqreturn_t omap_otg_irq(int irq, void *_isp)
641{
642 u16 otg_irq = omap_readw(OTG_IRQ_SRC);
643 u32 otg_ctrl;
644 int ret = IRQ_NONE;
645 struct isp1301 *isp = _isp;
646 struct usb_otg *otg = isp->phy.otg;
647
648 /* update ISP1301 transceiver from OTG controller */
649 if (otg_irq & OPRT_CHG) {
650 omap_writew(OPRT_CHG, OTG_IRQ_SRC);
651 isp1301_defer_work(isp, WORK_UPDATE_ISP);
652 ret = IRQ_HANDLED;
653
654 /* SRP to become b_peripheral failed */
655 } else if (otg_irq & B_SRP_TMROUT) {
656 pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
657 notresponding(isp);
658
659 /* gadget drivers that care should monitor all kinds of
660 * remote wakeup (SRP, normal) using their own timer
661 * to give "check cable and A-device" messages.
662 */
663 if (isp->phy.otg->state == OTG_STATE_B_SRP_INIT)
664 b_idle(isp, "srp_timeout");
665
666 omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
667 ret = IRQ_HANDLED;
668
669 /* HNP to become b_host failed */
670 } else if (otg_irq & B_HNP_FAIL) {
671 pr_debug("otg: %s B_HNP_FAIL, %06x\n",
672 state_name(isp), omap_readl(OTG_CTRL));
673 notresponding(isp);
674
675 otg_ctrl = omap_readl(OTG_CTRL);
676 otg_ctrl |= OTG_BUSDROP;
677 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
678 omap_writel(otg_ctrl, OTG_CTRL);
679
680 /* subset of b_peripheral()... */
681 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL;
682 pr_debug(" --> b_peripheral\n");
683
684 omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
685 ret = IRQ_HANDLED;
686
687 /* detect SRP from B-device ... */
688 } else if (otg_irq & A_SRP_DETECT) {
689 pr_debug("otg: %s SRP_DETECT, %06x\n",
690 state_name(isp), omap_readl(OTG_CTRL));
691
692 isp1301_defer_work(isp, WORK_UPDATE_OTG);
693 switch (isp->phy.otg->state) {
694 case OTG_STATE_A_IDLE:
695 if (!otg->host)
696 break;
697 isp1301_defer_work(isp, WORK_HOST_RESUME);
698 otg_ctrl = omap_readl(OTG_CTRL);
699 otg_ctrl |= OTG_A_BUSREQ;
700 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
701 & ~OTG_XCEIV_INPUTS
702 & OTG_CTRL_MASK;
703 omap_writel(otg_ctrl, OTG_CTRL);
704 break;
705 default:
706 break;
707 }
708
709 omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
710 ret = IRQ_HANDLED;
711
712 /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise)
713 * we don't track them separately
714 */
715 } else if (otg_irq & A_REQ_TMROUT) {
716 otg_ctrl = omap_readl(OTG_CTRL);
717 pr_info("otg: BCON_TMOUT from %s, %06x\n",
718 state_name(isp), otg_ctrl);
719 notresponding(isp);
720
721 otg_ctrl |= OTG_BUSDROP;
722 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
723 omap_writel(otg_ctrl, OTG_CTRL);
724 isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
725
726 omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
727 ret = IRQ_HANDLED;
728
729 /* A-supplied voltage fell too low; overcurrent */
730 } else if (otg_irq & A_VBUS_ERR) {
731 otg_ctrl = omap_readl(OTG_CTRL);
732 printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
733 state_name(isp), otg_irq, otg_ctrl);
734
735 otg_ctrl |= OTG_BUSDROP;
736 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
737 omap_writel(otg_ctrl, OTG_CTRL);
738 isp->phy.otg->state = OTG_STATE_A_VBUS_ERR;
739
740 omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
741 ret = IRQ_HANDLED;
742
743 /* switch driver; the transceiver code activates it,
744 * ungating the udc clock or resuming OHCI.
745 */
746 } else if (otg_irq & DRIVER_SWITCH) {
747 int kick = 0;
748
749 otg_ctrl = omap_readl(OTG_CTRL);
750 printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
751 state_name(isp),
752 (otg_ctrl & OTG_DRIVER_SEL)
753 ? "gadget" : "host",
754 otg_ctrl);
755 isp1301_defer_work(isp, WORK_UPDATE_ISP);
756
757 /* role is peripheral */
758 if (otg_ctrl & OTG_DRIVER_SEL) {
759 switch (isp->phy.otg->state) {
760 case OTG_STATE_A_IDLE:
761 b_idle(isp, __func__);
762 break;
763 default:
764 break;
765 }
766 isp1301_defer_work(isp, WORK_UPDATE_ISP);
767
768 /* role is host */
769 } else {
770 if (!(otg_ctrl & OTG_ID)) {
771 otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
772 omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
773 }
774
775 if (otg->host) {
776 switch (isp->phy.otg->state) {
777 case OTG_STATE_B_WAIT_ACON:
778 isp->phy.otg->state = OTG_STATE_B_HOST;
779 pr_debug(" --> b_host\n");
780 kick = 1;
781 break;
782 case OTG_STATE_A_WAIT_BCON:
783 isp->phy.otg->state = OTG_STATE_A_HOST;
784 pr_debug(" --> a_host\n");
785 break;
786 case OTG_STATE_A_PERIPHERAL:
787 isp->phy.otg->state = OTG_STATE_A_WAIT_BCON;
788 pr_debug(" --> a_wait_bcon\n");
789 break;
790 default:
791 break;
792 }
793 isp1301_defer_work(isp, WORK_HOST_RESUME);
794 }
795 }
796
797 omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
798 ret = IRQ_HANDLED;
799
800 if (kick)
801 usb_bus_start_enum(otg->host, otg->host->otg_port);
802 }
803
804 check_state(isp, __func__);
805 return ret;
806}
807
808static struct platform_device *otg_dev;
809
810static int isp1301_otg_init(struct isp1301 *isp)
811{
812 u32 l;
813
814 if (!otg_dev)
815 return -ENODEV;
816
817 dump_regs(isp, __func__);
818 /* some of these values are board-specific... */
819 l = omap_readl(OTG_SYSCON_2);
820 l |= OTG_EN
821 /* for B-device: */
822 | SRP_GPDATA /* 9msec Bdev D+ pulse */
823 | SRP_GPDVBUS /* discharge after VBUS pulse */
824 // | (3 << 24) /* 2msec VBUS pulse */
825 /* for A-device: */
826 | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */
827 | SRP_DPW /* detect 167+ns SRP pulses */
828 | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */
829 ;
830 omap_writel(l, OTG_SYSCON_2);
831
832 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
833 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
834
835 check_state(isp, __func__);
836 pr_debug("otg: %s, %s %06x\n",
837 state_name(isp), __func__, omap_readl(OTG_CTRL));
838
839 omap_writew(DRIVER_SWITCH | OPRT_CHG
840 | B_SRP_TMROUT | B_HNP_FAIL
841 | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
842
843 l = omap_readl(OTG_SYSCON_2);
844 l |= OTG_EN;
845 omap_writel(l, OTG_SYSCON_2);
846
847 return 0;
848}
849
850static int otg_probe(struct platform_device *dev)
851{
852 // struct omap_usb_config *config = dev->platform_data;
853
854 otg_dev = dev;
855 return 0;
856}
857
858static int otg_remove(struct platform_device *dev)
859{
860 otg_dev = NULL;
861 return 0;
862}
863
864static struct platform_driver omap_otg_driver = {
865 .probe = otg_probe,
866 .remove = otg_remove,
867 .driver = {
868 .name = "omap_otg",
869 },
870};
871
872static int otg_bind(struct isp1301 *isp)
873{
874 int status;
875
876 if (otg_dev)
877 return -EBUSY;
878
879 status = platform_driver_register(&omap_otg_driver);
880 if (status < 0)
881 return status;
882
883 if (otg_dev)
884 status = request_irq(otg_dev->resource[1].start, omap_otg_irq,
885 0, DRIVER_NAME, isp);
886 else
887 status = -ENODEV;
888
889 if (status < 0)
890 platform_driver_unregister(&omap_otg_driver);
891 return status;
892}
893
894static void otg_unbind(struct isp1301 *isp)
895{
896 if (!otg_dev)
897 return;
898 free_irq(otg_dev->resource[1].start, isp);
899}
900
901#else
902
903/* OTG controller isn't clocked */
904
905#endif /* CONFIG_USB_OTG */
906
907/*-------------------------------------------------------------------------*/
908
909static void b_peripheral(struct isp1301 *isp)
910{
911 u32 l;
912
913 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
914 omap_writel(l, OTG_CTRL);
915
916 usb_gadget_vbus_connect(isp->phy.otg->gadget);
917
918#ifdef CONFIG_USB_OTG
919 enable_vbus_draw(isp, 8);
920 otg_update_isp(isp);
921#else
922 enable_vbus_draw(isp, 100);
923 /* UDC driver just set OTG_BSESSVLD */
924 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP);
925 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN);
926 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL;
927 pr_debug(" --> b_peripheral\n");
928 dump_regs(isp, "2periph");
929#endif
930}
931
932static void isp_update_otg(struct isp1301 *isp, u8 stat)
933{
934 struct usb_otg *otg = isp->phy.otg;
935 u8 isp_stat, isp_bstat;
936 enum usb_otg_state state = isp->phy.otg->state;
937
938 if (stat & INTR_BDIS_ACON)
939 pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp));
940
941 /* start certain state transitions right away */
942 isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
943 if (isp_stat & INTR_ID_GND) {
944 if (otg->default_a) {
945 switch (state) {
946 case OTG_STATE_B_IDLE:
947 a_idle(isp, "idle");
948 fallthrough;
949 case OTG_STATE_A_IDLE:
950 enable_vbus_source(isp);
951 fallthrough;
952 case OTG_STATE_A_WAIT_VRISE:
953 /* we skip over OTG_STATE_A_WAIT_BCON, since
954 * the HC will transition to A_HOST (or
955 * A_SUSPEND!) without our noticing except
956 * when HNP is used.
957 */
958 if (isp_stat & INTR_VBUS_VLD)
959 isp->phy.otg->state = OTG_STATE_A_HOST;
960 break;
961 case OTG_STATE_A_WAIT_VFALL:
962 if (!(isp_stat & INTR_SESS_VLD))
963 a_idle(isp, "vfell");
964 break;
965 default:
966 if (!(isp_stat & INTR_VBUS_VLD))
967 isp->phy.otg->state = OTG_STATE_A_VBUS_ERR;
968 break;
969 }
970 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
971 } else {
972 switch (state) {
973 case OTG_STATE_B_PERIPHERAL:
974 case OTG_STATE_B_HOST:
975 case OTG_STATE_B_WAIT_ACON:
976 usb_gadget_vbus_disconnect(otg->gadget);
977 break;
978 default:
979 break;
980 }
981 if (state != OTG_STATE_A_IDLE)
982 a_idle(isp, "id");
983 if (otg->host && state == OTG_STATE_A_IDLE)
984 isp1301_defer_work(isp, WORK_HOST_RESUME);
985 isp_bstat = 0;
986 }
987 } else {
988 u32 l;
989
990 /* if user unplugged mini-A end of cable,
991 * don't bypass A_WAIT_VFALL.
992 */
993 if (otg->default_a) {
994 switch (state) {
995 default:
996 isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
997 break;
998 case OTG_STATE_A_WAIT_VFALL:
999 state = OTG_STATE_A_IDLE;
1000 /* hub_wq may take a while to notice and
1001 * handle this disconnect, so don't go
1002 * to B_IDLE quite yet.
1003 */
1004 break;
1005 case OTG_STATE_A_IDLE:
1006 host_suspend(isp);
1007 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
1008 MC1_BDIS_ACON_EN);
1009 isp->phy.otg->state = OTG_STATE_B_IDLE;
1010 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1011 l &= ~OTG_CTRL_BITS;
1012 omap_writel(l, OTG_CTRL);
1013 break;
1014 case OTG_STATE_B_IDLE:
1015 break;
1016 }
1017 }
1018 isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS);
1019
1020 switch (isp->phy.otg->state) {
1021 case OTG_STATE_B_PERIPHERAL:
1022 case OTG_STATE_B_WAIT_ACON:
1023 case OTG_STATE_B_HOST:
1024 if (likely(isp_bstat & OTG_B_SESS_VLD))
1025 break;
1026 enable_vbus_draw(isp, 0);
1027#ifndef CONFIG_USB_OTG
1028 /* UDC driver will clear OTG_BSESSVLD */
1029 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1030 OTG1_DP_PULLDOWN);
1031 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1032 OTG1_DP_PULLUP);
1033 dump_regs(isp, __func__);
1034#endif
1035 fallthrough;
1036 case OTG_STATE_B_SRP_INIT:
1037 b_idle(isp, __func__);
1038 l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
1039 omap_writel(l, OTG_CTRL);
1040 fallthrough;
1041 case OTG_STATE_B_IDLE:
1042 if (otg->gadget && (isp_bstat & OTG_B_SESS_VLD)) {
1043#ifdef CONFIG_USB_OTG
1044 update_otg1(isp, isp_stat);
1045 update_otg2(isp, isp_bstat);
1046#endif
1047 b_peripheral(isp);
1048 } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD)))
1049 isp_bstat |= OTG_B_SESS_END;
1050 break;
1051 case OTG_STATE_A_WAIT_VFALL:
1052 break;
1053 default:
1054 pr_debug("otg: unsupported b-device %s\n",
1055 state_name(isp));
1056 break;
1057 }
1058 }
1059
1060 if (state != isp->phy.otg->state)
1061 pr_debug(" isp, %s -> %s\n",
1062 usb_otg_state_string(state), state_name(isp));
1063
1064#ifdef CONFIG_USB_OTG
1065 /* update the OTG controller state to match the isp1301; may
1066 * trigger OPRT_CHG irqs for changes going to the isp1301.
1067 */
1068 update_otg1(isp, isp_stat);
1069 update_otg2(isp, isp_bstat);
1070 check_state(isp, __func__);
1071#endif
1072
1073 dump_regs(isp, "isp1301->otg");
1074}
1075
1076/*-------------------------------------------------------------------------*/
1077
1078static u8 isp1301_clear_latch(struct isp1301 *isp)
1079{
1080 u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH);
1081 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch);
1082 return latch;
1083}
1084
1085static void
1086isp1301_work(struct work_struct *work)
1087{
1088 struct isp1301 *isp = container_of(work, struct isp1301, work);
1089 int stop;
1090
1091 /* implicit lock: we're the only task using this device */
1092 isp->working = 1;
1093 do {
1094 stop = test_bit(WORK_STOP, &isp->todo);
1095
1096#ifdef CONFIG_USB_OTG
1097 /* transfer state from otg engine to isp1301 */
1098 if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) {
1099 otg_update_isp(isp);
1100 put_device(&isp->client->dev);
1101 }
1102#endif
1103 /* transfer state from isp1301 to otg engine */
1104 if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) {
1105 u8 stat = isp1301_clear_latch(isp);
1106
1107 isp_update_otg(isp, stat);
1108 put_device(&isp->client->dev);
1109 }
1110
1111 if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) {
1112 u32 otg_ctrl;
1113
1114 /*
1115 * skip A_WAIT_VRISE; hc transitions invisibly
1116 * skip A_WAIT_BCON; same.
1117 */
1118 switch (isp->phy.otg->state) {
1119 case OTG_STATE_A_WAIT_BCON:
1120 case OTG_STATE_A_WAIT_VRISE:
1121 isp->phy.otg->state = OTG_STATE_A_HOST;
1122 pr_debug(" --> a_host\n");
1123 otg_ctrl = omap_readl(OTG_CTRL);
1124 otg_ctrl |= OTG_A_BUSREQ;
1125 otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
1126 & OTG_CTRL_MASK;
1127 omap_writel(otg_ctrl, OTG_CTRL);
1128 break;
1129 case OTG_STATE_B_WAIT_ACON:
1130 isp->phy.otg->state = OTG_STATE_B_HOST;
1131 pr_debug(" --> b_host (acon)\n");
1132 break;
1133 case OTG_STATE_B_HOST:
1134 case OTG_STATE_B_IDLE:
1135 case OTG_STATE_A_IDLE:
1136 break;
1137 default:
1138 pr_debug(" host resume in %s\n",
1139 state_name(isp));
1140 }
1141 host_resume(isp);
1142 // mdelay(10);
1143 put_device(&isp->client->dev);
1144 }
1145
1146 if (test_and_clear_bit(WORK_TIMER, &isp->todo)) {
1147#ifdef VERBOSE
1148 dump_regs(isp, "timer");
1149 if (!stop)
1150 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1151#endif
1152 put_device(&isp->client->dev);
1153 }
1154
1155 if (isp->todo)
1156 dev_vdbg(&isp->client->dev,
1157 "work done, todo = 0x%lx\n",
1158 isp->todo);
1159 if (stop) {
1160 dev_dbg(&isp->client->dev, "stop\n");
1161 break;
1162 }
1163 } while (isp->todo);
1164 isp->working = 0;
1165}
1166
1167static irqreturn_t isp1301_irq(int irq, void *isp)
1168{
1169 isp1301_defer_work(isp, WORK_UPDATE_OTG);
1170 return IRQ_HANDLED;
1171}
1172
1173static void isp1301_timer(struct timer_list *t)
1174{
1175 struct isp1301 *isp = from_timer(isp, t, timer);
1176
1177 isp1301_defer_work(isp, WORK_TIMER);
1178}
1179
1180/*-------------------------------------------------------------------------*/
1181
1182static void isp1301_release(struct device *dev)
1183{
1184 struct isp1301 *isp;
1185
1186 isp = dev_get_drvdata(dev);
1187
1188 /* FIXME -- not with a "new style" driver, it doesn't!! */
1189
1190 /* ugly -- i2c hijacks our memory hook to wait_for_completion() */
1191 if (isp->i2c_release)
1192 isp->i2c_release(dev);
1193 kfree(isp->phy.otg);
1194 kfree (isp);
1195}
1196
1197static struct isp1301 *the_transceiver;
1198
1199static void isp1301_remove(struct i2c_client *i2c)
1200{
1201 struct isp1301 *isp;
1202
1203 isp = i2c_get_clientdata(i2c);
1204
1205 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1206 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1207 free_irq(i2c->irq, isp);
1208#ifdef CONFIG_USB_OTG
1209 otg_unbind(isp);
1210#endif
1211 set_bit(WORK_STOP, &isp->todo);
1212 del_timer_sync(&isp->timer);
1213 flush_work(&isp->work);
1214
1215 put_device(&i2c->dev);
1216 the_transceiver = NULL;
1217}
1218
1219/*-------------------------------------------------------------------------*/
1220
1221/* NOTE: three modes are possible here, only one of which
1222 * will be standards-conformant on any given system:
1223 *
1224 * - OTG mode (dual-role), required if there's a Mini-AB connector
1225 * - HOST mode, for when there's one or more A (host) connectors
1226 * - DEVICE mode, for when there's a B/Mini-B (device) connector
1227 *
1228 * As a rule, you won't have an isp1301 chip unless it's there to
1229 * support the OTG mode. Other modes help testing USB controllers
1230 * in isolation from (full) OTG support, or maybe so later board
1231 * revisions can help to support those feature.
1232 */
1233
1234#ifdef CONFIG_USB_OTG
1235
1236static int isp1301_otg_enable(struct isp1301 *isp)
1237{
1238 power_up(isp);
1239 isp1301_otg_init(isp);
1240
1241 /* NOTE: since we don't change this, this provides
1242 * a few more interrupts than are strictly needed.
1243 */
1244 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1245 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1246 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1247 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1248
1249 dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1250
1251 return 0;
1252}
1253
1254#endif
1255
1256/* add or disable the host device+driver */
1257static int
1258isp1301_set_host(struct usb_otg *otg, struct usb_bus *host)
1259{
1260 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy);
1261
1262 if (isp != the_transceiver)
1263 return -ENODEV;
1264
1265 if (!host) {
1266 omap_writew(0, OTG_IRQ_EN);
1267 power_down(isp);
1268 otg->host = NULL;
1269 return 0;
1270 }
1271
1272#ifdef CONFIG_USB_OTG
1273 otg->host = host;
1274 dev_dbg(&isp->client->dev, "registered host\n");
1275 host_suspend(isp);
1276 if (otg->gadget)
1277 return isp1301_otg_enable(isp);
1278 return 0;
1279
1280#elif !IS_ENABLED(CONFIG_USB_OMAP)
1281 // FIXME update its refcount
1282 otg->host = host;
1283
1284 power_up(isp);
1285
1286 if (machine_is_omap_h2())
1287 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1288
1289 dev_info(&isp->client->dev, "A-Host sessions ok\n");
1290 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1291 INTR_ID_GND);
1292 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1293 INTR_ID_GND);
1294
1295 /* If this has a Mini-AB connector, this mode is highly
1296 * nonstandard ... but can be handy for testing, especially with
1297 * the Mini-A end of an OTG cable. (Or something nonstandard
1298 * like MiniB-to-StandardB, maybe built with a gender mender.)
1299 */
1300 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1301
1302 dump_regs(isp, __func__);
1303
1304 return 0;
1305
1306#else
1307 dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1308 return -EINVAL;
1309#endif
1310
1311}
1312
1313static int
1314isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
1315{
1316 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy);
1317
1318 if (isp != the_transceiver)
1319 return -ENODEV;
1320
1321 if (!gadget) {
1322 omap_writew(0, OTG_IRQ_EN);
1323 if (!otg->default_a)
1324 enable_vbus_draw(isp, 0);
1325 usb_gadget_vbus_disconnect(otg->gadget);
1326 otg->gadget = NULL;
1327 power_down(isp);
1328 return 0;
1329 }
1330
1331#ifdef CONFIG_USB_OTG
1332 otg->gadget = gadget;
1333 dev_dbg(&isp->client->dev, "registered gadget\n");
1334 /* gadget driver may be suspended until vbus_connect () */
1335 if (otg->host)
1336 return isp1301_otg_enable(isp);
1337 return 0;
1338
1339#elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1340 otg->gadget = gadget;
1341 // FIXME update its refcount
1342
1343 {
1344 u32 l;
1345
1346 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1347 l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1348 l |= OTG_ID;
1349 omap_writel(l, OTG_CTRL);
1350 }
1351
1352 power_up(isp);
1353 isp->phy.otg->state = OTG_STATE_B_IDLE;
1354
1355 if (machine_is_omap_h2() || machine_is_omap_h3())
1356 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1357
1358 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1359 INTR_SESS_VLD);
1360 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1361 INTR_VBUS_VLD);
1362 dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1363 dump_regs(isp, __func__);
1364
1365 /* If this has a Mini-AB connector, this mode is highly
1366 * nonstandard ... but can be handy for testing, so long
1367 * as you don't plug a Mini-A cable into the jack.
1368 */
1369 if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1370 b_peripheral(isp);
1371
1372 return 0;
1373
1374#else
1375 dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1376 return -EINVAL;
1377#endif
1378}
1379
1380
1381/*-------------------------------------------------------------------------*/
1382
1383static int
1384isp1301_set_power(struct usb_phy *dev, unsigned mA)
1385{
1386 if (!the_transceiver)
1387 return -ENODEV;
1388 if (dev->otg->state == OTG_STATE_B_PERIPHERAL)
1389 enable_vbus_draw(the_transceiver, mA);
1390 return 0;
1391}
1392
1393static int
1394isp1301_start_srp(struct usb_otg *otg)
1395{
1396 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy);
1397 u32 otg_ctrl;
1398
1399 if (isp != the_transceiver || isp->phy.otg->state != OTG_STATE_B_IDLE)
1400 return -ENODEV;
1401
1402 otg_ctrl = omap_readl(OTG_CTRL);
1403 if (!(otg_ctrl & OTG_BSESSEND))
1404 return -EINVAL;
1405
1406 otg_ctrl |= OTG_B_BUSREQ;
1407 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1408 omap_writel(otg_ctrl, OTG_CTRL);
1409 isp->phy.otg->state = OTG_STATE_B_SRP_INIT;
1410
1411 pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1412 omap_readl(OTG_CTRL));
1413#ifdef CONFIG_USB_OTG
1414 check_state(isp, __func__);
1415#endif
1416 return 0;
1417}
1418
1419static int
1420isp1301_start_hnp(struct usb_otg *otg)
1421{
1422#ifdef CONFIG_USB_OTG
1423 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy);
1424 u32 l;
1425
1426 if (isp != the_transceiver)
1427 return -ENODEV;
1428 if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable))
1429 return -ENOTCONN;
1430 if (!otg->default_a && (otg->gadget == NULL
1431 || !otg->gadget->b_hnp_enable))
1432 return -ENOTCONN;
1433
1434 /* We want hardware to manage most HNP protocol timings.
1435 * So do this part as early as possible...
1436 */
1437 switch (isp->phy.otg->state) {
1438 case OTG_STATE_B_HOST:
1439 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL;
1440 /* caller will suspend next */
1441 break;
1442 case OTG_STATE_A_HOST:
1443#if 0
1444 /* autoconnect mode avoids irq latency bugs */
1445 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1446 MC1_BDIS_ACON_EN);
1447#endif
1448 /* caller must suspend then clear A_BUSREQ */
1449 usb_gadget_vbus_connect(otg->gadget);
1450 l = omap_readl(OTG_CTRL);
1451 l |= OTG_A_SETB_HNPEN;
1452 omap_writel(l, OTG_CTRL);
1453
1454 break;
1455 case OTG_STATE_A_PERIPHERAL:
1456 /* initiated by B-Host suspend */
1457 break;
1458 default:
1459 return -EILSEQ;
1460 }
1461 pr_debug("otg: HNP %s, %06x ...\n",
1462 state_name(isp), omap_readl(OTG_CTRL));
1463 check_state(isp, __func__);
1464 return 0;
1465#else
1466 /* srp-only */
1467 return -EINVAL;
1468#endif
1469}
1470
1471/*-------------------------------------------------------------------------*/
1472
1473static int
1474isp1301_probe(struct i2c_client *i2c)
1475{
1476 int status;
1477 struct isp1301 *isp;
1478 int irq;
1479
1480 if (the_transceiver)
1481 return 0;
1482
1483 isp = kzalloc(sizeof *isp, GFP_KERNEL);
1484 if (!isp)
1485 return 0;
1486
1487 isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL);
1488 if (!isp->phy.otg) {
1489 kfree(isp);
1490 return 0;
1491 }
1492
1493 INIT_WORK(&isp->work, isp1301_work);
1494 timer_setup(&isp->timer, isp1301_timer, 0);
1495
1496 i2c_set_clientdata(i2c, isp);
1497 isp->client = i2c;
1498
1499 /* verify the chip (shouldn't be necessary) */
1500 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1501 if (status != I2C_VENDOR_ID_PHILIPS) {
1502 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1503 goto fail;
1504 }
1505 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1506 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1507 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1508 goto fail;
1509 }
1510 isp->i2c_release = i2c->dev.release;
1511 i2c->dev.release = isp1301_release;
1512
1513 /* initial development used chiprev 2.00 */
1514 status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1515 dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1516 status >> 8, status & 0xff);
1517
1518 /* make like power-on reset */
1519 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1520
1521 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1522 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1523
1524 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1525 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1526 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1527 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1528
1529 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1530 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1531 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1532
1533#ifdef CONFIG_USB_OTG
1534 status = otg_bind(isp);
1535 if (status < 0) {
1536 dev_dbg(&i2c->dev, "can't bind OTG\n");
1537 goto fail;
1538 }
1539#endif
1540
1541 if (machine_is_omap_h2()) {
1542 struct gpio_desc *gpiod;
1543
1544 /* full speed signaling by default */
1545 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1546 MC1_SPEED);
1547 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1548 MC2_SPD_SUSP_CTRL);
1549
1550 gpiod = devm_gpiod_get(&i2c->dev, NULL, GPIOD_IN);
1551 if (IS_ERR(gpiod)) {
1552 dev_err(&i2c->dev, "cannot obtain H2 GPIO\n");
1553 goto fail;
1554 }
1555 gpiod_set_consumer_name(gpiod, "isp1301");
1556 irq = gpiod_to_irq(gpiod);
1557 isp->irq_type = IRQF_TRIGGER_FALLING;
1558 } else {
1559 irq = i2c->irq;
1560 }
1561
1562 status = request_irq(irq, isp1301_irq,
1563 isp->irq_type, DRIVER_NAME, isp);
1564 if (status < 0) {
1565 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1566 i2c->irq, status);
1567 goto fail;
1568 }
1569
1570 isp->phy.dev = &i2c->dev;
1571 isp->phy.label = DRIVER_NAME;
1572 isp->phy.set_power = isp1301_set_power;
1573
1574 isp->phy.otg->usb_phy = &isp->phy;
1575 isp->phy.otg->set_host = isp1301_set_host;
1576 isp->phy.otg->set_peripheral = isp1301_set_peripheral;
1577 isp->phy.otg->start_srp = isp1301_start_srp;
1578 isp->phy.otg->start_hnp = isp1301_start_hnp;
1579
1580 enable_vbus_draw(isp, 0);
1581 power_down(isp);
1582 the_transceiver = isp;
1583
1584#ifdef CONFIG_USB_OTG
1585 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1586 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1587#endif
1588
1589 dump_regs(isp, __func__);
1590
1591#ifdef VERBOSE
1592 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1593 dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1594#endif
1595
1596 status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2);
1597 if (status < 0)
1598 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1599 status);
1600
1601 return 0;
1602
1603fail:
1604 kfree(isp->phy.otg);
1605 kfree(isp);
1606 return -ENODEV;
1607}
1608
1609static const struct i2c_device_id isp1301_id[] = {
1610 { "isp1301_omap", 0 },
1611 { }
1612};
1613MODULE_DEVICE_TABLE(i2c, isp1301_id);
1614
1615static struct i2c_driver isp1301_driver = {
1616 .driver = {
1617 .name = "isp1301_omap",
1618 },
1619 .probe_new = isp1301_probe,
1620 .remove = isp1301_remove,
1621 .id_table = isp1301_id,
1622};
1623
1624/*-------------------------------------------------------------------------*/
1625
1626static int __init isp_init(void)
1627{
1628 return i2c_add_driver(&isp1301_driver);
1629}
1630subsys_initcall(isp_init);
1631
1632static void __exit isp_exit(void)
1633{
1634 if (the_transceiver)
1635 usb_remove_phy(&the_transceiver->phy);
1636 i2c_del_driver(&isp1301_driver);
1637}
1638module_exit(isp_exit);
1639