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.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 <mach/mux.h>
27
28 #include <mach/usb.h>
29
30 #undef VERBOSE
31
32
33 #define DRIVER_VERSION "24 August 2004"
34 #define DRIVER_NAME (isp1301_driver.driver.name)
35
36 MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver");
37 MODULE_LICENSE("GPL");
38
39 struct 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
tps65010_set_vbus_draw(unsigned mA)90 static 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
enable_vbus_draw(struct isp1301 * isp,unsigned mA)98 static 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
enable_vbus_draw(struct isp1301 * isp,unsigned mA)107 static 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
enable_vbus_source(struct isp1301 * isp)117 static 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 */
notresponding(struct isp1301 * isp)126 static inline void notresponding(struct isp1301 *isp)
127 {
128 printk(KERN_NOTICE "OTG device not responding.\n");
129 }
130
131
132 /*-------------------------------------------------------------------------*/
133
134 static struct i2c_driver isp1301_driver;
135
136 /* smbus apis are used for portability */
137
138 static inline u8
isp1301_get_u8(struct isp1301 * isp,u8 reg)139 isp1301_get_u8(struct isp1301 *isp, u8 reg)
140 {
141 return i2c_smbus_read_byte_data(isp->client, reg + 0);
142 }
143
144 static inline int
isp1301_get_u16(struct isp1301 * isp,u8 reg)145 isp1301_get_u16(struct isp1301 *isp, u8 reg)
146 {
147 return i2c_smbus_read_word_data(isp->client, reg);
148 }
149
150 static inline int
isp1301_set_bits(struct isp1301 * isp,u8 reg,u8 bits)151 isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits)
152 {
153 return i2c_smbus_write_byte_data(isp->client, reg + 0, bits);
154 }
155
156 static inline int
isp1301_clear_bits(struct isp1301 * isp,u8 reg,u8 bits)157 isp1301_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
state_name(struct isp1301 * isp)222 static 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
power_down(struct isp1301 * isp)237 static 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
power_up(struct isp1301 * isp)248 static 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
host_suspend(struct isp1301 * isp)261 static 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
host_resume(struct isp1301 * isp)279 static 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
gadget_suspend(struct isp1301 * isp)294 static 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 */
isp1301_defer_work(struct isp1301 * isp,int work)311 static 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 */
a_idle(struct isp1301 * isp,const char * tag)325 static 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 */
b_idle(struct isp1301 * isp,const char * tag)349 static 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
372 static void
dump_regs(struct isp1301 * isp,const char * label)373 dump_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
check_state(struct isp1301 * isp,const char * tag)399 static 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
check_state(struct isp1301 * isp,const char * tag)473 static inline void check_state(struct isp1301 *isp, const char *tag) { }
474
475 #endif
476
477 /* outputs from ISP1301_INTERRUPT_SOURCE */
update_otg1(struct isp1301 * isp,u8 int_src)478 static 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 */
update_otg2(struct isp1301 * isp,u8 otg_status)513 static 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 */
otg_update_isp(struct isp1301 * isp)528 static 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 }
550 pullup:
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:
561 pulldown:
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
omap_otg_irq(int irq,void * _isp)640 static 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
808 static struct platform_device *otg_dev;
809
isp1301_otg_init(struct isp1301 * isp)810 static 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
otg_probe(struct platform_device * dev)850 static 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
otg_remove(struct platform_device * dev)858 static int otg_remove(struct platform_device *dev)
859 {
860 otg_dev = NULL;
861 return 0;
862 }
863
864 static struct platform_driver omap_otg_driver = {
865 .probe = otg_probe,
866 .remove = otg_remove,
867 .driver = {
868 .name = "omap_otg",
869 },
870 };
871
otg_bind(struct isp1301 * isp)872 static 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
otg_unbind(struct isp1301 * isp)894 static 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
b_peripheral(struct isp1301 * isp)909 static 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
isp_update_otg(struct isp1301 * isp,u8 stat)932 static 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
isp1301_clear_latch(struct isp1301 * isp)1078 static 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
1085 static void
isp1301_work(struct work_struct * work)1086 isp1301_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
isp1301_irq(int irq,void * isp)1167 static irqreturn_t isp1301_irq(int irq, void *isp)
1168 {
1169 isp1301_defer_work(isp, WORK_UPDATE_OTG);
1170 return IRQ_HANDLED;
1171 }
1172
isp1301_timer(struct timer_list * t)1173 static 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
isp1301_release(struct device * dev)1182 static 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
1197 static struct isp1301 *the_transceiver;
1198
isp1301_remove(struct i2c_client * i2c)1199 static int 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 return 0;
1219 }
1220
1221 /*-------------------------------------------------------------------------*/
1222
1223 /* NOTE: three modes are possible here, only one of which
1224 * will be standards-conformant on any given system:
1225 *
1226 * - OTG mode (dual-role), required if there's a Mini-AB connector
1227 * - HOST mode, for when there's one or more A (host) connectors
1228 * - DEVICE mode, for when there's a B/Mini-B (device) connector
1229 *
1230 * As a rule, you won't have an isp1301 chip unless it's there to
1231 * support the OTG mode. Other modes help testing USB controllers
1232 * in isolation from (full) OTG support, or maybe so later board
1233 * revisions can help to support those feature.
1234 */
1235
1236 #ifdef CONFIG_USB_OTG
1237
isp1301_otg_enable(struct isp1301 * isp)1238 static int isp1301_otg_enable(struct isp1301 *isp)
1239 {
1240 power_up(isp);
1241 isp1301_otg_init(isp);
1242
1243 /* NOTE: since we don't change this, this provides
1244 * a few more interrupts than are strictly needed.
1245 */
1246 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1247 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1248 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1249 INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND);
1250
1251 dev_info(&isp->client->dev, "ready for dual-role USB ...\n");
1252
1253 return 0;
1254 }
1255
1256 #endif
1257
1258 /* add or disable the host device+driver */
1259 static int
isp1301_set_host(struct usb_otg * otg,struct usb_bus * host)1260 isp1301_set_host(struct usb_otg *otg, struct usb_bus *host)
1261 {
1262 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy);
1263
1264 if (isp != the_transceiver)
1265 return -ENODEV;
1266
1267 if (!host) {
1268 omap_writew(0, OTG_IRQ_EN);
1269 power_down(isp);
1270 otg->host = NULL;
1271 return 0;
1272 }
1273
1274 #ifdef CONFIG_USB_OTG
1275 otg->host = host;
1276 dev_dbg(&isp->client->dev, "registered host\n");
1277 host_suspend(isp);
1278 if (otg->gadget)
1279 return isp1301_otg_enable(isp);
1280 return 0;
1281
1282 #elif !IS_ENABLED(CONFIG_USB_OMAP)
1283 // FIXME update its refcount
1284 otg->host = host;
1285
1286 power_up(isp);
1287
1288 if (machine_is_omap_h2())
1289 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1290
1291 dev_info(&isp->client->dev, "A-Host sessions ok\n");
1292 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1293 INTR_ID_GND);
1294 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1295 INTR_ID_GND);
1296
1297 /* If this has a Mini-AB connector, this mode is highly
1298 * nonstandard ... but can be handy for testing, especially with
1299 * the Mini-A end of an OTG cable. (Or something nonstandard
1300 * like MiniB-to-StandardB, maybe built with a gender mender.)
1301 */
1302 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV);
1303
1304 dump_regs(isp, __func__);
1305
1306 return 0;
1307
1308 #else
1309 dev_dbg(&isp->client->dev, "host sessions not allowed\n");
1310 return -EINVAL;
1311 #endif
1312
1313 }
1314
1315 static int
isp1301_set_peripheral(struct usb_otg * otg,struct usb_gadget * gadget)1316 isp1301_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
1317 {
1318 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy);
1319
1320 if (isp != the_transceiver)
1321 return -ENODEV;
1322
1323 if (!gadget) {
1324 omap_writew(0, OTG_IRQ_EN);
1325 if (!otg->default_a)
1326 enable_vbus_draw(isp, 0);
1327 usb_gadget_vbus_disconnect(otg->gadget);
1328 otg->gadget = NULL;
1329 power_down(isp);
1330 return 0;
1331 }
1332
1333 #ifdef CONFIG_USB_OTG
1334 otg->gadget = gadget;
1335 dev_dbg(&isp->client->dev, "registered gadget\n");
1336 /* gadget driver may be suspended until vbus_connect () */
1337 if (otg->host)
1338 return isp1301_otg_enable(isp);
1339 return 0;
1340
1341 #elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE)
1342 otg->gadget = gadget;
1343 // FIXME update its refcount
1344
1345 {
1346 u32 l;
1347
1348 l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
1349 l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
1350 l |= OTG_ID;
1351 omap_writel(l, OTG_CTRL);
1352 }
1353
1354 power_up(isp);
1355 isp->phy.otg->state = OTG_STATE_B_IDLE;
1356
1357 if (machine_is_omap_h2() || machine_is_omap_h3())
1358 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
1359
1360 isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING,
1361 INTR_SESS_VLD);
1362 isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING,
1363 INTR_VBUS_VLD);
1364 dev_info(&isp->client->dev, "B-Peripheral sessions ok\n");
1365 dump_regs(isp, __func__);
1366
1367 /* If this has a Mini-AB connector, this mode is highly
1368 * nonstandard ... but can be handy for testing, so long
1369 * as you don't plug a Mini-A cable into the jack.
1370 */
1371 if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD)
1372 b_peripheral(isp);
1373
1374 return 0;
1375
1376 #else
1377 dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n");
1378 return -EINVAL;
1379 #endif
1380 }
1381
1382
1383 /*-------------------------------------------------------------------------*/
1384
1385 static int
isp1301_set_power(struct usb_phy * dev,unsigned mA)1386 isp1301_set_power(struct usb_phy *dev, unsigned mA)
1387 {
1388 if (!the_transceiver)
1389 return -ENODEV;
1390 if (dev->otg->state == OTG_STATE_B_PERIPHERAL)
1391 enable_vbus_draw(the_transceiver, mA);
1392 return 0;
1393 }
1394
1395 static int
isp1301_start_srp(struct usb_otg * otg)1396 isp1301_start_srp(struct usb_otg *otg)
1397 {
1398 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy);
1399 u32 otg_ctrl;
1400
1401 if (isp != the_transceiver || isp->phy.otg->state != OTG_STATE_B_IDLE)
1402 return -ENODEV;
1403
1404 otg_ctrl = omap_readl(OTG_CTRL);
1405 if (!(otg_ctrl & OTG_BSESSEND))
1406 return -EINVAL;
1407
1408 otg_ctrl |= OTG_B_BUSREQ;
1409 otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
1410 omap_writel(otg_ctrl, OTG_CTRL);
1411 isp->phy.otg->state = OTG_STATE_B_SRP_INIT;
1412
1413 pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
1414 omap_readl(OTG_CTRL));
1415 #ifdef CONFIG_USB_OTG
1416 check_state(isp, __func__);
1417 #endif
1418 return 0;
1419 }
1420
1421 static int
isp1301_start_hnp(struct usb_otg * otg)1422 isp1301_start_hnp(struct usb_otg *otg)
1423 {
1424 #ifdef CONFIG_USB_OTG
1425 struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy);
1426 u32 l;
1427
1428 if (isp != the_transceiver)
1429 return -ENODEV;
1430 if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable))
1431 return -ENOTCONN;
1432 if (!otg->default_a && (otg->gadget == NULL
1433 || !otg->gadget->b_hnp_enable))
1434 return -ENOTCONN;
1435
1436 /* We want hardware to manage most HNP protocol timings.
1437 * So do this part as early as possible...
1438 */
1439 switch (isp->phy.otg->state) {
1440 case OTG_STATE_B_HOST:
1441 isp->phy.otg->state = OTG_STATE_B_PERIPHERAL;
1442 /* caller will suspend next */
1443 break;
1444 case OTG_STATE_A_HOST:
1445 #if 0
1446 /* autoconnect mode avoids irq latency bugs */
1447 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1448 MC1_BDIS_ACON_EN);
1449 #endif
1450 /* caller must suspend then clear A_BUSREQ */
1451 usb_gadget_vbus_connect(otg->gadget);
1452 l = omap_readl(OTG_CTRL);
1453 l |= OTG_A_SETB_HNPEN;
1454 omap_writel(l, OTG_CTRL);
1455
1456 break;
1457 case OTG_STATE_A_PERIPHERAL:
1458 /* initiated by B-Host suspend */
1459 break;
1460 default:
1461 return -EILSEQ;
1462 }
1463 pr_debug("otg: HNP %s, %06x ...\n",
1464 state_name(isp), omap_readl(OTG_CTRL));
1465 check_state(isp, __func__);
1466 return 0;
1467 #else
1468 /* srp-only */
1469 return -EINVAL;
1470 #endif
1471 }
1472
1473 /*-------------------------------------------------------------------------*/
1474
1475 static int
isp1301_probe(struct i2c_client * i2c,const struct i2c_device_id * id)1476 isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
1477 {
1478 int status;
1479 struct isp1301 *isp;
1480 int irq;
1481
1482 if (the_transceiver)
1483 return 0;
1484
1485 isp = kzalloc(sizeof *isp, GFP_KERNEL);
1486 if (!isp)
1487 return 0;
1488
1489 isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL);
1490 if (!isp->phy.otg) {
1491 kfree(isp);
1492 return 0;
1493 }
1494
1495 INIT_WORK(&isp->work, isp1301_work);
1496 timer_setup(&isp->timer, isp1301_timer, 0);
1497
1498 i2c_set_clientdata(i2c, isp);
1499 isp->client = i2c;
1500
1501 /* verify the chip (shouldn't be necessary) */
1502 status = isp1301_get_u16(isp, ISP1301_VENDOR_ID);
1503 if (status != I2C_VENDOR_ID_PHILIPS) {
1504 dev_dbg(&i2c->dev, "not philips id: %d\n", status);
1505 goto fail;
1506 }
1507 status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID);
1508 if (status != I2C_PRODUCT_ID_PHILIPS_1301) {
1509 dev_dbg(&i2c->dev, "not isp1301, %d\n", status);
1510 goto fail;
1511 }
1512 isp->i2c_release = i2c->dev.release;
1513 i2c->dev.release = isp1301_release;
1514
1515 /* initial development used chiprev 2.00 */
1516 status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE);
1517 dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n",
1518 status >> 8, status & 0xff);
1519
1520 /* make like power-on reset */
1521 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK);
1522
1523 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI);
1524 isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI);
1525
1526 isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1,
1527 OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN);
1528 isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1,
1529 ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
1530
1531 isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0);
1532 isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0);
1533 isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0);
1534
1535 #ifdef CONFIG_USB_OTG
1536 status = otg_bind(isp);
1537 if (status < 0) {
1538 dev_dbg(&i2c->dev, "can't bind OTG\n");
1539 goto fail;
1540 }
1541 #endif
1542
1543 if (machine_is_omap_h2()) {
1544 struct gpio_desc *gpiod;
1545
1546 /* full speed signaling by default */
1547 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
1548 MC1_SPEED);
1549 isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
1550 MC2_SPD_SUSP_CTRL);
1551
1552 gpiod = devm_gpiod_get(&i2c->dev, NULL, GPIOD_IN);
1553 if (IS_ERR(gpiod)) {
1554 dev_err(&i2c->dev, "cannot obtain H2 GPIO\n");
1555 goto fail;
1556 }
1557 gpiod_set_consumer_name(gpiod, "isp1301");
1558 irq = gpiod_to_irq(gpiod);
1559 isp->irq_type = IRQF_TRIGGER_FALLING;
1560 } else {
1561 irq = i2c->irq;
1562 }
1563
1564 status = request_irq(irq, isp1301_irq,
1565 isp->irq_type, DRIVER_NAME, isp);
1566 if (status < 0) {
1567 dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",
1568 i2c->irq, status);
1569 goto fail;
1570 }
1571
1572 isp->phy.dev = &i2c->dev;
1573 isp->phy.label = DRIVER_NAME;
1574 isp->phy.set_power = isp1301_set_power;
1575
1576 isp->phy.otg->usb_phy = &isp->phy;
1577 isp->phy.otg->set_host = isp1301_set_host;
1578 isp->phy.otg->set_peripheral = isp1301_set_peripheral;
1579 isp->phy.otg->start_srp = isp1301_start_srp;
1580 isp->phy.otg->start_hnp = isp1301_start_hnp;
1581
1582 enable_vbus_draw(isp, 0);
1583 power_down(isp);
1584 the_transceiver = isp;
1585
1586 #ifdef CONFIG_USB_OTG
1587 update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
1588 update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
1589 #endif
1590
1591 dump_regs(isp, __func__);
1592
1593 #ifdef VERBOSE
1594 mod_timer(&isp->timer, jiffies + TIMER_JIFFIES);
1595 dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES);
1596 #endif
1597
1598 status = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2);
1599 if (status < 0)
1600 dev_err(&i2c->dev, "can't register transceiver, %d\n",
1601 status);
1602
1603 return 0;
1604
1605 fail:
1606 kfree(isp->phy.otg);
1607 kfree(isp);
1608 return -ENODEV;
1609 }
1610
1611 static const struct i2c_device_id isp1301_id[] = {
1612 { "isp1301_omap", 0 },
1613 { }
1614 };
1615 MODULE_DEVICE_TABLE(i2c, isp1301_id);
1616
1617 static struct i2c_driver isp1301_driver = {
1618 .driver = {
1619 .name = "isp1301_omap",
1620 },
1621 .probe = isp1301_probe,
1622 .remove = isp1301_remove,
1623 .id_table = isp1301_id,
1624 };
1625
1626 /*-------------------------------------------------------------------------*/
1627
isp_init(void)1628 static int __init isp_init(void)
1629 {
1630 return i2c_add_driver(&isp1301_driver);
1631 }
1632 subsys_initcall(isp_init);
1633
isp_exit(void)1634 static void __exit isp_exit(void)
1635 {
1636 if (the_transceiver)
1637 usb_remove_phy(&the_transceiver->phy);
1638 i2c_del_driver(&isp1301_driver);
1639 }
1640 module_exit(isp_exit);
1641
1642