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Merge remote-tracking branch 'drm-misc/topic/drm-misc'
[deliverable/linux.git] / drivers / usb / chipidea / core.c
1 /*
2 * core.c - ChipIdea USB IP core family device controller
3 *
4 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
5 *
6 * Author: David Lopo
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 /*
14 * Description: ChipIdea USB IP core family device controller
15 *
16 * This driver is composed of several blocks:
17 * - HW: hardware interface
18 * - DBG: debug facilities (optional)
19 * - UTIL: utilities
20 * - ISR: interrupts handling
21 * - ENDPT: endpoint operations (Gadget API)
22 * - GADGET: gadget operations (Gadget API)
23 * - BUS: bus glue code, bus abstraction layer
24 *
25 * Compile Options
26 * - STALL_IN: non-empty bulk-in pipes cannot be halted
27 * if defined mass storage compliance succeeds but with warnings
28 * => case 4: Hi > Dn
29 * => case 5: Hi > Di
30 * => case 8: Hi <> Do
31 * if undefined usbtest 13 fails
32 * - TRACE: enable function tracing (depends on DEBUG)
33 *
34 * Main Features
35 * - Chapter 9 & Mass Storage Compliance with Gadget File Storage
36 * - Chapter 9 Compliance with Gadget Zero (STALL_IN undefined)
37 * - Normal & LPM support
38 *
39 * USBTEST Report
40 * - OK: 0-12, 13 (STALL_IN defined) & 14
41 * - Not Supported: 15 & 16 (ISO)
42 *
43 * TODO List
44 * - Suspend & Remote Wakeup
45 */
46 #include <linux/delay.h>
47 #include <linux/device.h>
48 #include <linux/dma-mapping.h>
49 #include <linux/extcon.h>
50 #include <linux/phy/phy.h>
51 #include <linux/platform_device.h>
52 #include <linux/module.h>
53 #include <linux/idr.h>
54 #include <linux/interrupt.h>
55 #include <linux/io.h>
56 #include <linux/kernel.h>
57 #include <linux/slab.h>
58 #include <linux/pm_runtime.h>
59 #include <linux/usb/ch9.h>
60 #include <linux/usb/gadget.h>
61 #include <linux/usb/otg.h>
62 #include <linux/usb/chipidea.h>
63 #include <linux/usb/of.h>
64 #include <linux/of.h>
65 #include <linux/phy.h>
66 #include <linux/regulator/consumer.h>
67 #include <linux/usb/ehci_def.h>
68
69 #include "ci.h"
70 #include "udc.h"
71 #include "bits.h"
72 #include "host.h"
73 #include "otg.h"
74 #include "otg_fsm.h"
75
76 /* Controller register map */
77 static const u8 ci_regs_nolpm[] = {
78 [CAP_CAPLENGTH] = 0x00U,
79 [CAP_HCCPARAMS] = 0x08U,
80 [CAP_DCCPARAMS] = 0x24U,
81 [CAP_TESTMODE] = 0x38U,
82 [OP_USBCMD] = 0x00U,
83 [OP_USBSTS] = 0x04U,
84 [OP_USBINTR] = 0x08U,
85 [OP_DEVICEADDR] = 0x14U,
86 [OP_ENDPTLISTADDR] = 0x18U,
87 [OP_TTCTRL] = 0x1CU,
88 [OP_BURSTSIZE] = 0x20U,
89 [OP_PORTSC] = 0x44U,
90 [OP_DEVLC] = 0x84U,
91 [OP_OTGSC] = 0x64U,
92 [OP_USBMODE] = 0x68U,
93 [OP_ENDPTSETUPSTAT] = 0x6CU,
94 [OP_ENDPTPRIME] = 0x70U,
95 [OP_ENDPTFLUSH] = 0x74U,
96 [OP_ENDPTSTAT] = 0x78U,
97 [OP_ENDPTCOMPLETE] = 0x7CU,
98 [OP_ENDPTCTRL] = 0x80U,
99 };
100
101 static const u8 ci_regs_lpm[] = {
102 [CAP_CAPLENGTH] = 0x00U,
103 [CAP_HCCPARAMS] = 0x08U,
104 [CAP_DCCPARAMS] = 0x24U,
105 [CAP_TESTMODE] = 0xFCU,
106 [OP_USBCMD] = 0x00U,
107 [OP_USBSTS] = 0x04U,
108 [OP_USBINTR] = 0x08U,
109 [OP_DEVICEADDR] = 0x14U,
110 [OP_ENDPTLISTADDR] = 0x18U,
111 [OP_TTCTRL] = 0x1CU,
112 [OP_BURSTSIZE] = 0x20U,
113 [OP_PORTSC] = 0x44U,
114 [OP_DEVLC] = 0x84U,
115 [OP_OTGSC] = 0xC4U,
116 [OP_USBMODE] = 0xC8U,
117 [OP_ENDPTSETUPSTAT] = 0xD8U,
118 [OP_ENDPTPRIME] = 0xDCU,
119 [OP_ENDPTFLUSH] = 0xE0U,
120 [OP_ENDPTSTAT] = 0xE4U,
121 [OP_ENDPTCOMPLETE] = 0xE8U,
122 [OP_ENDPTCTRL] = 0xECU,
123 };
124
125 static void hw_alloc_regmap(struct ci_hdrc *ci, bool is_lpm)
126 {
127 int i;
128
129 for (i = 0; i < OP_ENDPTCTRL; i++)
130 ci->hw_bank.regmap[i] =
131 (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
132 (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
133
134 for (; i <= OP_LAST; i++)
135 ci->hw_bank.regmap[i] = ci->hw_bank.op +
136 4 * (i - OP_ENDPTCTRL) +
137 (is_lpm
138 ? ci_regs_lpm[OP_ENDPTCTRL]
139 : ci_regs_nolpm[OP_ENDPTCTRL]);
140
141 }
142
143 static enum ci_revision ci_get_revision(struct ci_hdrc *ci)
144 {
145 int ver = hw_read_id_reg(ci, ID_ID, VERSION) >> __ffs(VERSION);
146 enum ci_revision rev = CI_REVISION_UNKNOWN;
147
148 if (ver == 0x2) {
149 rev = hw_read_id_reg(ci, ID_ID, REVISION)
150 >> __ffs(REVISION);
151 rev += CI_REVISION_20;
152 } else if (ver == 0x0) {
153 rev = CI_REVISION_1X;
154 }
155
156 return rev;
157 }
158
159 /**
160 * hw_read_intr_enable: returns interrupt enable register
161 *
162 * @ci: the controller
163 *
164 * This function returns register data
165 */
166 u32 hw_read_intr_enable(struct ci_hdrc *ci)
167 {
168 return hw_read(ci, OP_USBINTR, ~0);
169 }
170
171 /**
172 * hw_read_intr_status: returns interrupt status register
173 *
174 * @ci: the controller
175 *
176 * This function returns register data
177 */
178 u32 hw_read_intr_status(struct ci_hdrc *ci)
179 {
180 return hw_read(ci, OP_USBSTS, ~0);
181 }
182
183 /**
184 * hw_port_test_set: writes port test mode (execute without interruption)
185 * @mode: new value
186 *
187 * This function returns an error code
188 */
189 int hw_port_test_set(struct ci_hdrc *ci, u8 mode)
190 {
191 const u8 TEST_MODE_MAX = 7;
192
193 if (mode > TEST_MODE_MAX)
194 return -EINVAL;
195
196 hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << __ffs(PORTSC_PTC));
197 return 0;
198 }
199
200 /**
201 * hw_port_test_get: reads port test mode value
202 *
203 * @ci: the controller
204 *
205 * This function returns port test mode value
206 */
207 u8 hw_port_test_get(struct ci_hdrc *ci)
208 {
209 return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC);
210 }
211
212 static void hw_wait_phy_stable(void)
213 {
214 /*
215 * The phy needs some delay to output the stable status from low
216 * power mode. And for OTGSC, the status inputs are debounced
217 * using a 1 ms time constant, so, delay 2ms for controller to get
218 * the stable status, like vbus and id when the phy leaves low power.
219 */
220 usleep_range(2000, 2500);
221 }
222
223 /* The PHY enters/leaves low power mode */
224 static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable)
225 {
226 enum ci_hw_regs reg = ci->hw_bank.lpm ? OP_DEVLC : OP_PORTSC;
227 bool lpm = !!(hw_read(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm)));
228
229 if (enable && !lpm)
230 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
231 PORTSC_PHCD(ci->hw_bank.lpm));
232 else if (!enable && lpm)
233 hw_write(ci, reg, PORTSC_PHCD(ci->hw_bank.lpm),
234 0);
235 }
236
237 static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
238 {
239 u32 reg;
240
241 /* bank is a module variable */
242 ci->hw_bank.abs = base;
243
244 ci->hw_bank.cap = ci->hw_bank.abs;
245 ci->hw_bank.cap += ci->platdata->capoffset;
246 ci->hw_bank.op = ci->hw_bank.cap + (ioread32(ci->hw_bank.cap) & 0xff);
247
248 hw_alloc_regmap(ci, false);
249 reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
250 __ffs(HCCPARAMS_LEN);
251 ci->hw_bank.lpm = reg;
252 if (reg)
253 hw_alloc_regmap(ci, !!reg);
254 ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
255 ci->hw_bank.size += OP_LAST;
256 ci->hw_bank.size /= sizeof(u32);
257
258 reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
259 __ffs(DCCPARAMS_DEN);
260 ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
261
262 if (ci->hw_ep_max > ENDPT_MAX)
263 return -ENODEV;
264
265 ci_hdrc_enter_lpm(ci, false);
266
267 /* Disable all interrupts bits */
268 hw_write(ci, OP_USBINTR, 0xffffffff, 0);
269
270 /* Clear all interrupts status bits*/
271 hw_write(ci, OP_USBSTS, 0xffffffff, 0xffffffff);
272
273 ci->rev = ci_get_revision(ci);
274
275 dev_dbg(ci->dev,
276 "ChipIdea HDRC found, revision: %d, lpm: %d; cap: %p op: %p\n",
277 ci->rev, ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
278
279 /* setup lock mode ? */
280
281 /* ENDPTSETUPSTAT is '0' by default */
282
283 /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
284
285 return 0;
286 }
287
288 static void hw_phymode_configure(struct ci_hdrc *ci)
289 {
290 u32 portsc, lpm, sts = 0;
291
292 switch (ci->platdata->phy_mode) {
293 case USBPHY_INTERFACE_MODE_UTMI:
294 portsc = PORTSC_PTS(PTS_UTMI);
295 lpm = DEVLC_PTS(PTS_UTMI);
296 break;
297 case USBPHY_INTERFACE_MODE_UTMIW:
298 portsc = PORTSC_PTS(PTS_UTMI) | PORTSC_PTW;
299 lpm = DEVLC_PTS(PTS_UTMI) | DEVLC_PTW;
300 break;
301 case USBPHY_INTERFACE_MODE_ULPI:
302 portsc = PORTSC_PTS(PTS_ULPI);
303 lpm = DEVLC_PTS(PTS_ULPI);
304 break;
305 case USBPHY_INTERFACE_MODE_SERIAL:
306 portsc = PORTSC_PTS(PTS_SERIAL);
307 lpm = DEVLC_PTS(PTS_SERIAL);
308 sts = 1;
309 break;
310 case USBPHY_INTERFACE_MODE_HSIC:
311 portsc = PORTSC_PTS(PTS_HSIC);
312 lpm = DEVLC_PTS(PTS_HSIC);
313 break;
314 default:
315 return;
316 }
317
318 if (ci->hw_bank.lpm) {
319 hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
320 if (sts)
321 hw_write(ci, OP_DEVLC, DEVLC_STS, DEVLC_STS);
322 } else {
323 hw_write(ci, OP_PORTSC, PORTSC_PTS(7) | PORTSC_PTW, portsc);
324 if (sts)
325 hw_write(ci, OP_PORTSC, PORTSC_STS, PORTSC_STS);
326 }
327 }
328
329 /**
330 * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
331 * interfaces
332 * @ci: the controller
333 *
334 * This function returns an error code if the phy failed to init
335 */
336 static int _ci_usb_phy_init(struct ci_hdrc *ci)
337 {
338 int ret;
339
340 if (ci->phy) {
341 ret = phy_init(ci->phy);
342 if (ret)
343 return ret;
344
345 ret = phy_power_on(ci->phy);
346 if (ret) {
347 phy_exit(ci->phy);
348 return ret;
349 }
350 } else {
351 ret = usb_phy_init(ci->usb_phy);
352 }
353
354 return ret;
355 }
356
357 /**
358 * _ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
359 * interfaces
360 * @ci: the controller
361 */
362 static void ci_usb_phy_exit(struct ci_hdrc *ci)
363 {
364 if (ci->phy) {
365 phy_power_off(ci->phy);
366 phy_exit(ci->phy);
367 } else {
368 usb_phy_shutdown(ci->usb_phy);
369 }
370 }
371
372 /**
373 * ci_usb_phy_init: initialize phy according to different phy type
374 * @ci: the controller
375 *
376 * This function returns an error code if usb_phy_init has failed
377 */
378 static int ci_usb_phy_init(struct ci_hdrc *ci)
379 {
380 int ret;
381
382 switch (ci->platdata->phy_mode) {
383 case USBPHY_INTERFACE_MODE_UTMI:
384 case USBPHY_INTERFACE_MODE_UTMIW:
385 case USBPHY_INTERFACE_MODE_HSIC:
386 ret = _ci_usb_phy_init(ci);
387 if (!ret)
388 hw_wait_phy_stable();
389 else
390 return ret;
391 hw_phymode_configure(ci);
392 break;
393 case USBPHY_INTERFACE_MODE_ULPI:
394 case USBPHY_INTERFACE_MODE_SERIAL:
395 hw_phymode_configure(ci);
396 ret = _ci_usb_phy_init(ci);
397 if (ret)
398 return ret;
399 break;
400 default:
401 ret = _ci_usb_phy_init(ci);
402 if (!ret)
403 hw_wait_phy_stable();
404 }
405
406 return ret;
407 }
408
409
410 /**
411 * ci_platform_configure: do controller configure
412 * @ci: the controller
413 *
414 */
415 void ci_platform_configure(struct ci_hdrc *ci)
416 {
417 bool is_device_mode, is_host_mode;
418
419 is_device_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_DC;
420 is_host_mode = hw_read(ci, OP_USBMODE, USBMODE_CM) == USBMODE_CM_HC;
421
422 if (is_device_mode &&
423 (ci->platdata->flags & CI_HDRC_DISABLE_DEVICE_STREAMING))
424 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
425
426 if (is_host_mode &&
427 (ci->platdata->flags & CI_HDRC_DISABLE_HOST_STREAMING))
428 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
429
430 if (ci->platdata->flags & CI_HDRC_FORCE_FULLSPEED) {
431 if (ci->hw_bank.lpm)
432 hw_write(ci, OP_DEVLC, DEVLC_PFSC, DEVLC_PFSC);
433 else
434 hw_write(ci, OP_PORTSC, PORTSC_PFSC, PORTSC_PFSC);
435 }
436
437 if (ci->platdata->flags & CI_HDRC_SET_NON_ZERO_TTHA)
438 hw_write(ci, OP_TTCTRL, TTCTRL_TTHA_MASK, TTCTRL_TTHA);
439
440 hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
441
442 if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
443 hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
444 ci->platdata->ahb_burst_config);
445
446 /* override burst size, take effect only when ahb_burst_config is 0 */
447 if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
448 if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
449 hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
450 ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
451
452 if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
453 hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
454 ci->platdata->rx_burst_size);
455 }
456 }
457
458 /**
459 * hw_controller_reset: do controller reset
460 * @ci: the controller
461 *
462 * This function returns an error code
463 */
464 static int hw_controller_reset(struct ci_hdrc *ci)
465 {
466 int count = 0;
467
468 hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
469 while (hw_read(ci, OP_USBCMD, USBCMD_RST)) {
470 udelay(10);
471 if (count++ > 1000)
472 return -ETIMEDOUT;
473 }
474
475 return 0;
476 }
477
478 /**
479 * hw_device_reset: resets chip (execute without interruption)
480 * @ci: the controller
481 *
482 * This function returns an error code
483 */
484 int hw_device_reset(struct ci_hdrc *ci)
485 {
486 int ret;
487
488 /* should flush & stop before reset */
489 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
490 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
491
492 ret = hw_controller_reset(ci);
493 if (ret) {
494 dev_err(ci->dev, "error resetting controller, ret=%d\n", ret);
495 return ret;
496 }
497
498 if (ci->platdata->notify_event)
499 ci->platdata->notify_event(ci,
500 CI_HDRC_CONTROLLER_RESET_EVENT);
501
502 /* USBMODE should be configured step by step */
503 hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
504 hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_DC);
505 /* HW >= 2.3 */
506 hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
507
508 if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DC) {
509 pr_err("cannot enter in %s device mode", ci_role(ci)->name);
510 pr_err("lpm = %i", ci->hw_bank.lpm);
511 return -ENODEV;
512 }
513
514 ci_platform_configure(ci);
515
516 return 0;
517 }
518
519 /**
520 * hw_wait_reg: wait the register value
521 *
522 * Sometimes, it needs to wait register value before going on.
523 * Eg, when switch to device mode, the vbus value should be lower
524 * than OTGSC_BSV before connects to host.
525 *
526 * @ci: the controller
527 * @reg: register index
528 * @mask: mast bit
529 * @value: the bit value to wait
530 * @timeout_ms: timeout in millisecond
531 *
532 * This function returns an error code if timeout
533 */
534 int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask,
535 u32 value, unsigned int timeout_ms)
536 {
537 unsigned long elapse = jiffies + msecs_to_jiffies(timeout_ms);
538
539 while (hw_read(ci, reg, mask) != value) {
540 if (time_after(jiffies, elapse)) {
541 dev_err(ci->dev, "timeout waiting for %08x in %d\n",
542 mask, reg);
543 return -ETIMEDOUT;
544 }
545 msleep(20);
546 }
547
548 return 0;
549 }
550
551 static irqreturn_t ci_irq(int irq, void *data)
552 {
553 struct ci_hdrc *ci = data;
554 irqreturn_t ret = IRQ_NONE;
555 u32 otgsc = 0;
556
557 if (ci->in_lpm) {
558 disable_irq_nosync(irq);
559 ci->wakeup_int = true;
560 pm_runtime_get(ci->dev);
561 return IRQ_HANDLED;
562 }
563
564 if (ci->is_otg) {
565 otgsc = hw_read_otgsc(ci, ~0);
566 if (ci_otg_is_fsm_mode(ci)) {
567 ret = ci_otg_fsm_irq(ci);
568 if (ret == IRQ_HANDLED)
569 return ret;
570 }
571 }
572
573 /*
574 * Handle id change interrupt, it indicates device/host function
575 * switch.
576 */
577 if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
578 ci->id_event = true;
579 /* Clear ID change irq status */
580 hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
581 ci_otg_queue_work(ci);
582 return IRQ_HANDLED;
583 }
584
585 /*
586 * Handle vbus change interrupt, it indicates device connection
587 * and disconnection events.
588 */
589 if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
590 ci->b_sess_valid_event = true;
591 /* Clear BSV irq */
592 hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
593 ci_otg_queue_work(ci);
594 return IRQ_HANDLED;
595 }
596
597 /* Handle device/host interrupt */
598 if (ci->role != CI_ROLE_END)
599 ret = ci_role(ci)->irq(ci);
600
601 return ret;
602 }
603
604 static int ci_vbus_notifier(struct notifier_block *nb, unsigned long event,
605 void *ptr)
606 {
607 struct ci_hdrc_cable *vbus = container_of(nb, struct ci_hdrc_cable, nb);
608 struct ci_hdrc *ci = vbus->ci;
609
610 if (event)
611 vbus->state = true;
612 else
613 vbus->state = false;
614
615 vbus->changed = true;
616
617 ci_irq(ci->irq, ci);
618 return NOTIFY_DONE;
619 }
620
621 static int ci_id_notifier(struct notifier_block *nb, unsigned long event,
622 void *ptr)
623 {
624 struct ci_hdrc_cable *id = container_of(nb, struct ci_hdrc_cable, nb);
625 struct ci_hdrc *ci = id->ci;
626
627 if (event)
628 id->state = false;
629 else
630 id->state = true;
631
632 id->changed = true;
633
634 ci_irq(ci->irq, ci);
635 return NOTIFY_DONE;
636 }
637
638 static int ci_get_platdata(struct device *dev,
639 struct ci_hdrc_platform_data *platdata)
640 {
641 struct extcon_dev *ext_vbus, *ext_id;
642 struct ci_hdrc_cable *cable;
643 int ret;
644
645 if (!platdata->phy_mode)
646 platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
647
648 if (!platdata->dr_mode)
649 platdata->dr_mode = usb_get_dr_mode(dev);
650
651 if (platdata->dr_mode == USB_DR_MODE_UNKNOWN)
652 platdata->dr_mode = USB_DR_MODE_OTG;
653
654 if (platdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
655 /* Get the vbus regulator */
656 platdata->reg_vbus = devm_regulator_get(dev, "vbus");
657 if (PTR_ERR(platdata->reg_vbus) == -EPROBE_DEFER) {
658 return -EPROBE_DEFER;
659 } else if (PTR_ERR(platdata->reg_vbus) == -ENODEV) {
660 /* no vbus regulator is needed */
661 platdata->reg_vbus = NULL;
662 } else if (IS_ERR(platdata->reg_vbus)) {
663 dev_err(dev, "Getting regulator error: %ld\n",
664 PTR_ERR(platdata->reg_vbus));
665 return PTR_ERR(platdata->reg_vbus);
666 }
667 /* Get TPL support */
668 if (!platdata->tpl_support)
669 platdata->tpl_support =
670 of_usb_host_tpl_support(dev->of_node);
671 }
672
673 if (platdata->dr_mode == USB_DR_MODE_OTG) {
674 /* We can support HNP and SRP of OTG 2.0 */
675 platdata->ci_otg_caps.otg_rev = 0x0200;
676 platdata->ci_otg_caps.hnp_support = true;
677 platdata->ci_otg_caps.srp_support = true;
678
679 /* Update otg capabilities by DT properties */
680 ret = of_usb_update_otg_caps(dev->of_node,
681 &platdata->ci_otg_caps);
682 if (ret)
683 return ret;
684 }
685
686 if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
687 platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
688
689 of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
690 &platdata->phy_clkgate_delay_us);
691
692 platdata->itc_setting = 1;
693
694 of_property_read_u32(dev->of_node, "itc-setting",
695 &platdata->itc_setting);
696
697 ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
698 &platdata->ahb_burst_config);
699 if (!ret) {
700 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
701 } else if (ret != -EINVAL) {
702 dev_err(dev, "failed to get ahb-burst-config\n");
703 return ret;
704 }
705
706 ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
707 &platdata->tx_burst_size);
708 if (!ret) {
709 platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
710 } else if (ret != -EINVAL) {
711 dev_err(dev, "failed to get tx-burst-size-dword\n");
712 return ret;
713 }
714
715 ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
716 &platdata->rx_burst_size);
717 if (!ret) {
718 platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
719 } else if (ret != -EINVAL) {
720 dev_err(dev, "failed to get rx-burst-size-dword\n");
721 return ret;
722 }
723
724 if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL))
725 platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA;
726
727 ext_id = ERR_PTR(-ENODEV);
728 ext_vbus = ERR_PTR(-ENODEV);
729 if (of_property_read_bool(dev->of_node, "extcon")) {
730 /* Each one of them is not mandatory */
731 ext_vbus = extcon_get_edev_by_phandle(dev, 0);
732 if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
733 return PTR_ERR(ext_vbus);
734
735 ext_id = extcon_get_edev_by_phandle(dev, 1);
736 if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
737 return PTR_ERR(ext_id);
738 }
739
740 cable = &platdata->vbus_extcon;
741 cable->nb.notifier_call = ci_vbus_notifier;
742 cable->edev = ext_vbus;
743
744 if (!IS_ERR(ext_vbus)) {
745 ret = extcon_get_cable_state_(cable->edev, EXTCON_USB);
746 if (ret)
747 cable->state = true;
748 else
749 cable->state = false;
750 }
751
752 cable = &platdata->id_extcon;
753 cable->nb.notifier_call = ci_id_notifier;
754 cable->edev = ext_id;
755
756 if (!IS_ERR(ext_id)) {
757 ret = extcon_get_cable_state_(cable->edev, EXTCON_USB_HOST);
758 if (ret)
759 cable->state = false;
760 else
761 cable->state = true;
762 }
763 return 0;
764 }
765
766 static int ci_extcon_register(struct ci_hdrc *ci)
767 {
768 struct ci_hdrc_cable *id, *vbus;
769 int ret;
770
771 id = &ci->platdata->id_extcon;
772 id->ci = ci;
773 if (!IS_ERR(id->edev)) {
774 ret = extcon_register_notifier(id->edev, EXTCON_USB_HOST,
775 &id->nb);
776 if (ret < 0) {
777 dev_err(ci->dev, "register ID failed\n");
778 return ret;
779 }
780 }
781
782 vbus = &ci->platdata->vbus_extcon;
783 vbus->ci = ci;
784 if (!IS_ERR(vbus->edev)) {
785 ret = extcon_register_notifier(vbus->edev, EXTCON_USB,
786 &vbus->nb);
787 if (ret < 0) {
788 extcon_unregister_notifier(id->edev, EXTCON_USB_HOST,
789 &id->nb);
790 dev_err(ci->dev, "register VBUS failed\n");
791 return ret;
792 }
793 }
794
795 return 0;
796 }
797
798 static void ci_extcon_unregister(struct ci_hdrc *ci)
799 {
800 struct ci_hdrc_cable *cable;
801
802 cable = &ci->platdata->id_extcon;
803 if (!IS_ERR(cable->edev))
804 extcon_unregister_notifier(cable->edev, EXTCON_USB_HOST,
805 &cable->nb);
806
807 cable = &ci->platdata->vbus_extcon;
808 if (!IS_ERR(cable->edev))
809 extcon_unregister_notifier(cable->edev, EXTCON_USB, &cable->nb);
810 }
811
812 static DEFINE_IDA(ci_ida);
813
814 struct platform_device *ci_hdrc_add_device(struct device *dev,
815 struct resource *res, int nres,
816 struct ci_hdrc_platform_data *platdata)
817 {
818 struct platform_device *pdev;
819 int id, ret;
820
821 ret = ci_get_platdata(dev, platdata);
822 if (ret)
823 return ERR_PTR(ret);
824
825 id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
826 if (id < 0)
827 return ERR_PTR(id);
828
829 pdev = platform_device_alloc("ci_hdrc", id);
830 if (!pdev) {
831 ret = -ENOMEM;
832 goto put_id;
833 }
834
835 pdev->dev.parent = dev;
836 pdev->dev.dma_mask = dev->dma_mask;
837 pdev->dev.dma_parms = dev->dma_parms;
838 dma_set_coherent_mask(&pdev->dev, dev->coherent_dma_mask);
839
840 ret = platform_device_add_resources(pdev, res, nres);
841 if (ret)
842 goto err;
843
844 ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
845 if (ret)
846 goto err;
847
848 ret = platform_device_add(pdev);
849 if (ret)
850 goto err;
851
852 return pdev;
853
854 err:
855 platform_device_put(pdev);
856 put_id:
857 ida_simple_remove(&ci_ida, id);
858 return ERR_PTR(ret);
859 }
860 EXPORT_SYMBOL_GPL(ci_hdrc_add_device);
861
862 void ci_hdrc_remove_device(struct platform_device *pdev)
863 {
864 int id = pdev->id;
865 platform_device_unregister(pdev);
866 ida_simple_remove(&ci_ida, id);
867 }
868 EXPORT_SYMBOL_GPL(ci_hdrc_remove_device);
869
870 static inline void ci_role_destroy(struct ci_hdrc *ci)
871 {
872 ci_hdrc_gadget_destroy(ci);
873 ci_hdrc_host_destroy(ci);
874 if (ci->is_otg)
875 ci_hdrc_otg_destroy(ci);
876 }
877
878 static void ci_get_otg_capable(struct ci_hdrc *ci)
879 {
880 if (ci->platdata->flags & CI_HDRC_DUAL_ROLE_NOT_OTG)
881 ci->is_otg = false;
882 else
883 ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
884 DCCPARAMS_DC | DCCPARAMS_HC)
885 == (DCCPARAMS_DC | DCCPARAMS_HC));
886 if (ci->is_otg) {
887 dev_dbg(ci->dev, "It is OTG capable controller\n");
888 /* Disable and clear all OTG irq */
889 hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
890 OTGSC_INT_STATUS_BITS);
891 }
892 }
893
894 static int ci_hdrc_probe(struct platform_device *pdev)
895 {
896 struct device *dev = &pdev->dev;
897 struct ci_hdrc *ci;
898 struct resource *res;
899 void __iomem *base;
900 int ret;
901 enum usb_dr_mode dr_mode;
902
903 if (!dev_get_platdata(dev)) {
904 dev_err(dev, "platform data missing\n");
905 return -ENODEV;
906 }
907
908 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
909 base = devm_ioremap_resource(dev, res);
910 if (IS_ERR(base))
911 return PTR_ERR(base);
912
913 ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
914 if (!ci)
915 return -ENOMEM;
916
917 ci->dev = dev;
918 ci->platdata = dev_get_platdata(dev);
919 ci->imx28_write_fix = !!(ci->platdata->flags &
920 CI_HDRC_IMX28_WRITE_FIX);
921 ci->supports_runtime_pm = !!(ci->platdata->flags &
922 CI_HDRC_SUPPORTS_RUNTIME_PM);
923
924 ret = hw_device_init(ci, base);
925 if (ret < 0) {
926 dev_err(dev, "can't initialize hardware\n");
927 return -ENODEV;
928 }
929
930 if (ci->platdata->phy) {
931 ci->phy = ci->platdata->phy;
932 } else if (ci->platdata->usb_phy) {
933 ci->usb_phy = ci->platdata->usb_phy;
934 } else {
935 ci->phy = devm_phy_get(dev->parent, "usb-phy");
936 ci->usb_phy = devm_usb_get_phy(dev->parent, USB_PHY_TYPE_USB2);
937
938 /* if both generic PHY and USB PHY layers aren't enabled */
939 if (PTR_ERR(ci->phy) == -ENOSYS &&
940 PTR_ERR(ci->usb_phy) == -ENXIO)
941 return -ENXIO;
942
943 if (IS_ERR(ci->phy) && IS_ERR(ci->usb_phy))
944 return -EPROBE_DEFER;
945
946 if (IS_ERR(ci->phy))
947 ci->phy = NULL;
948 else if (IS_ERR(ci->usb_phy))
949 ci->usb_phy = NULL;
950 }
951
952 ret = ci_usb_phy_init(ci);
953 if (ret) {
954 dev_err(dev, "unable to init phy: %d\n", ret);
955 return ret;
956 }
957
958 ci->hw_bank.phys = res->start;
959
960 ci->irq = platform_get_irq(pdev, 0);
961 if (ci->irq < 0) {
962 dev_err(dev, "missing IRQ\n");
963 ret = ci->irq;
964 goto deinit_phy;
965 }
966
967 ci_get_otg_capable(ci);
968
969 dr_mode = ci->platdata->dr_mode;
970 /* initialize role(s) before the interrupt is requested */
971 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
972 ret = ci_hdrc_host_init(ci);
973 if (ret)
974 dev_info(dev, "doesn't support host\n");
975 }
976
977 if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
978 ret = ci_hdrc_gadget_init(ci);
979 if (ret)
980 dev_info(dev, "doesn't support gadget\n");
981 }
982
983 if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
984 dev_err(dev, "no supported roles\n");
985 ret = -ENODEV;
986 goto deinit_phy;
987 }
988
989 if (ci->is_otg && ci->roles[CI_ROLE_GADGET]) {
990 ret = ci_hdrc_otg_init(ci);
991 if (ret) {
992 dev_err(dev, "init otg fails, ret = %d\n", ret);
993 goto stop;
994 }
995 }
996
997 if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
998 if (ci->is_otg) {
999 ci->role = ci_otg_role(ci);
1000 /* Enable ID change irq */
1001 hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
1002 } else {
1003 /*
1004 * If the controller is not OTG capable, but support
1005 * role switch, the defalt role is gadget, and the
1006 * user can switch it through debugfs.
1007 */
1008 ci->role = CI_ROLE_GADGET;
1009 }
1010 } else {
1011 ci->role = ci->roles[CI_ROLE_HOST]
1012 ? CI_ROLE_HOST
1013 : CI_ROLE_GADGET;
1014 }
1015
1016 if (!ci_otg_is_fsm_mode(ci)) {
1017 /* only update vbus status for peripheral */
1018 if (ci->role == CI_ROLE_GADGET)
1019 ci_handle_vbus_change(ci);
1020
1021 ret = ci_role_start(ci, ci->role);
1022 if (ret) {
1023 dev_err(dev, "can't start %s role\n",
1024 ci_role(ci)->name);
1025 goto stop;
1026 }
1027 }
1028
1029 platform_set_drvdata(pdev, ci);
1030 ret = devm_request_irq(dev, ci->irq, ci_irq, IRQF_SHARED,
1031 ci->platdata->name, ci);
1032 if (ret)
1033 goto stop;
1034
1035 ret = ci_extcon_register(ci);
1036 if (ret)
1037 goto stop;
1038
1039 if (ci->supports_runtime_pm) {
1040 pm_runtime_set_active(&pdev->dev);
1041 pm_runtime_enable(&pdev->dev);
1042 pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
1043 pm_runtime_mark_last_busy(ci->dev);
1044 pm_runtime_use_autosuspend(&pdev->dev);
1045 }
1046
1047 if (ci_otg_is_fsm_mode(ci))
1048 ci_hdrc_otg_fsm_start(ci);
1049
1050 device_set_wakeup_capable(&pdev->dev, true);
1051
1052 ret = dbg_create_files(ci);
1053 if (!ret)
1054 return 0;
1055
1056 ci_extcon_unregister(ci);
1057 stop:
1058 ci_role_destroy(ci);
1059 deinit_phy:
1060 ci_usb_phy_exit(ci);
1061
1062 return ret;
1063 }
1064
1065 static int ci_hdrc_remove(struct platform_device *pdev)
1066 {
1067 struct ci_hdrc *ci = platform_get_drvdata(pdev);
1068
1069 if (ci->supports_runtime_pm) {
1070 pm_runtime_get_sync(&pdev->dev);
1071 pm_runtime_disable(&pdev->dev);
1072 pm_runtime_put_noidle(&pdev->dev);
1073 }
1074
1075 dbg_remove_files(ci);
1076 ci_extcon_unregister(ci);
1077 ci_role_destroy(ci);
1078 ci_hdrc_enter_lpm(ci, true);
1079 ci_usb_phy_exit(ci);
1080
1081 return 0;
1082 }
1083
1084 #ifdef CONFIG_PM
1085 /* Prepare wakeup by SRP before suspend */
1086 static void ci_otg_fsm_suspend_for_srp(struct ci_hdrc *ci)
1087 {
1088 if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1089 !hw_read_otgsc(ci, OTGSC_ID)) {
1090 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
1091 PORTSC_PP);
1092 hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_WKCN,
1093 PORTSC_WKCN);
1094 }
1095 }
1096
1097 /* Handle SRP when wakeup by data pulse */
1098 static void ci_otg_fsm_wakeup_by_srp(struct ci_hdrc *ci)
1099 {
1100 if ((ci->fsm.otg->state == OTG_STATE_A_IDLE) &&
1101 (ci->fsm.a_bus_drop == 1) && (ci->fsm.a_bus_req == 0)) {
1102 if (!hw_read_otgsc(ci, OTGSC_ID)) {
1103 ci->fsm.a_srp_det = 1;
1104 ci->fsm.a_bus_drop = 0;
1105 } else {
1106 ci->fsm.id = 1;
1107 }
1108 ci_otg_queue_work(ci);
1109 }
1110 }
1111
1112 static void ci_controller_suspend(struct ci_hdrc *ci)
1113 {
1114 disable_irq(ci->irq);
1115 ci_hdrc_enter_lpm(ci, true);
1116 if (ci->platdata->phy_clkgate_delay_us)
1117 usleep_range(ci->platdata->phy_clkgate_delay_us,
1118 ci->platdata->phy_clkgate_delay_us + 50);
1119 usb_phy_set_suspend(ci->usb_phy, 1);
1120 ci->in_lpm = true;
1121 enable_irq(ci->irq);
1122 }
1123
1124 static int ci_controller_resume(struct device *dev)
1125 {
1126 struct ci_hdrc *ci = dev_get_drvdata(dev);
1127
1128 dev_dbg(dev, "at %s\n", __func__);
1129
1130 if (!ci->in_lpm) {
1131 WARN_ON(1);
1132 return 0;
1133 }
1134
1135 ci_hdrc_enter_lpm(ci, false);
1136 if (ci->usb_phy) {
1137 usb_phy_set_suspend(ci->usb_phy, 0);
1138 usb_phy_set_wakeup(ci->usb_phy, false);
1139 hw_wait_phy_stable();
1140 }
1141
1142 ci->in_lpm = false;
1143 if (ci->wakeup_int) {
1144 ci->wakeup_int = false;
1145 pm_runtime_mark_last_busy(ci->dev);
1146 pm_runtime_put_autosuspend(ci->dev);
1147 enable_irq(ci->irq);
1148 if (ci_otg_is_fsm_mode(ci))
1149 ci_otg_fsm_wakeup_by_srp(ci);
1150 }
1151
1152 return 0;
1153 }
1154
1155 #ifdef CONFIG_PM_SLEEP
1156 static int ci_suspend(struct device *dev)
1157 {
1158 struct ci_hdrc *ci = dev_get_drvdata(dev);
1159
1160 if (ci->wq)
1161 flush_workqueue(ci->wq);
1162 /*
1163 * Controller needs to be active during suspend, otherwise the core
1164 * may run resume when the parent is at suspend if other driver's
1165 * suspend fails, it occurs before parent's suspend has not started,
1166 * but the core suspend has finished.
1167 */
1168 if (ci->in_lpm)
1169 pm_runtime_resume(dev);
1170
1171 if (ci->in_lpm) {
1172 WARN_ON(1);
1173 return 0;
1174 }
1175
1176 if (device_may_wakeup(dev)) {
1177 if (ci_otg_is_fsm_mode(ci))
1178 ci_otg_fsm_suspend_for_srp(ci);
1179
1180 usb_phy_set_wakeup(ci->usb_phy, true);
1181 enable_irq_wake(ci->irq);
1182 }
1183
1184 ci_controller_suspend(ci);
1185
1186 return 0;
1187 }
1188
1189 static int ci_resume(struct device *dev)
1190 {
1191 struct ci_hdrc *ci = dev_get_drvdata(dev);
1192 int ret;
1193
1194 if (device_may_wakeup(dev))
1195 disable_irq_wake(ci->irq);
1196
1197 ret = ci_controller_resume(dev);
1198 if (ret)
1199 return ret;
1200
1201 if (ci->supports_runtime_pm) {
1202 pm_runtime_disable(dev);
1203 pm_runtime_set_active(dev);
1204 pm_runtime_enable(dev);
1205 }
1206
1207 return ret;
1208 }
1209 #endif /* CONFIG_PM_SLEEP */
1210
1211 static int ci_runtime_suspend(struct device *dev)
1212 {
1213 struct ci_hdrc *ci = dev_get_drvdata(dev);
1214
1215 dev_dbg(dev, "at %s\n", __func__);
1216
1217 if (ci->in_lpm) {
1218 WARN_ON(1);
1219 return 0;
1220 }
1221
1222 if (ci_otg_is_fsm_mode(ci))
1223 ci_otg_fsm_suspend_for_srp(ci);
1224
1225 usb_phy_set_wakeup(ci->usb_phy, true);
1226 ci_controller_suspend(ci);
1227
1228 return 0;
1229 }
1230
1231 static int ci_runtime_resume(struct device *dev)
1232 {
1233 return ci_controller_resume(dev);
1234 }
1235
1236 #endif /* CONFIG_PM */
1237 static const struct dev_pm_ops ci_pm_ops = {
1238 SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
1239 SET_RUNTIME_PM_OPS(ci_runtime_suspend, ci_runtime_resume, NULL)
1240 };
1241
1242 static struct platform_driver ci_hdrc_driver = {
1243 .probe = ci_hdrc_probe,
1244 .remove = ci_hdrc_remove,
1245 .driver = {
1246 .name = "ci_hdrc",
1247 .pm = &ci_pm_ops,
1248 },
1249 };
1250
1251 static int __init ci_hdrc_platform_register(void)
1252 {
1253 ci_hdrc_host_driver_init();
1254 return platform_driver_register(&ci_hdrc_driver);
1255 }
1256 module_init(ci_hdrc_platform_register);
1257
1258 static void __exit ci_hdrc_platform_unregister(void)
1259 {
1260 platform_driver_unregister(&ci_hdrc_driver);
1261 }
1262 module_exit(ci_hdrc_platform_unregister);
1263
1264 MODULE_ALIAS("platform:ci_hdrc");
1265 MODULE_LICENSE("GPL v2");
1266 MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
1267 MODULE_DESCRIPTION("ChipIdea HDRC Driver");
Linux kernel - Deliverables
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