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USB: OTG: add Marvell usb OTG driver support
[linux-block.git] / drivers / usb / otg / mv_otg.c
CommitLineData
277164f0
NZ		 1/*
2 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
3 * Author: Chao Xie <chao.xie@marvell.com>
4 * Neil Zhang <zhangwm@marvell.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/io.h>
16#include <linux/uaccess.h>
17#include <linux/device.h>
18#include <linux/proc_fs.h>
19#include <linux/clk.h>
20#include <linux/workqueue.h>
21#include <linux/platform_device.h>
22
23#include <linux/usb.h>
24#include <linux/usb/ch9.h>
25#include <linux/usb/otg.h>
26#include <linux/usb/gadget.h>
27#include <linux/usb/hcd.h>
28#include <linux/platform_data/mv_usb.h>
29
30#include "mv_otg.h"
31
32#define DRIVER_DESC "Marvell USB OTG transceiver driver"
33#define DRIVER_VERSION "Jan 20, 2010"
34
35MODULE_DESCRIPTION(DRIVER_DESC);
36MODULE_VERSION(DRIVER_VERSION);
37MODULE_LICENSE("GPL");
38
39static const char driver_name[] = "mv-otg";
40
41static char *state_string[] = {
42 "undefined",
43 "b_idle",
44 "b_srp_init",
45 "b_peripheral",
46 "b_wait_acon",
47 "b_host",
48 "a_idle",
49 "a_wait_vrise",
50 "a_wait_bcon",
51 "a_host",
52 "a_suspend",
53 "a_peripheral",
54 "a_wait_vfall",
55 "a_vbus_err"
56};
57
58static int mv_otg_set_vbus(struct otg_transceiver *otg, bool on)
59{
60 struct mv_otg *mvotg = container_of(otg, struct mv_otg, otg);
61 if (mvotg->pdata->set_vbus == NULL)
62 return -ENODEV;
63
64 return mvotg->pdata->set_vbus(on);
65}
66
67static int mv_otg_set_host(struct otg_transceiver *otg,
68 struct usb_bus *host)
69{
70 otg->host = host;
71
72 return 0;
73}
74
75static int mv_otg_set_peripheral(struct otg_transceiver *otg,
76 struct usb_gadget *gadget)
77{
78 otg->gadget = gadget;
79
80 return 0;
81}
82
83static void mv_otg_run_state_machine(struct mv_otg *mvotg,
84 unsigned long delay)
85{
86 dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
87 if (!mvotg->qwork)
88 return;
89
90 queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
91}
92
93static void mv_otg_timer_await_bcon(unsigned long data)
94{
95 struct mv_otg *mvotg = (struct mv_otg *) data;
96
97 mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
98
99 dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
100
101 if (spin_trylock(&mvotg->wq_lock)) {
102 mv_otg_run_state_machine(mvotg, 0);
103 spin_unlock(&mvotg->wq_lock);
104 }
105}
106
107static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
108{
109 struct timer_list *timer;
110
111 if (id >= OTG_TIMER_NUM)
112 return -EINVAL;
113
114 timer = &mvotg->otg_ctrl.timer[id];
115
116 if (timer_pending(timer))
117 del_timer(timer);
118
119 return 0;
120}
121
122static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
123 unsigned long interval,
124 void (*callback) (unsigned long))
125{
126 struct timer_list *timer;
127
128 if (id >= OTG_TIMER_NUM)
129 return -EINVAL;
130
131 timer = &mvotg->otg_ctrl.timer[id];
132 if (timer_pending(timer)) {
133 dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id);
134 return -EBUSY;
135 }
136
137 init_timer(timer);
138 timer->data = (unsigned long) mvotg;
139 timer->function = callback;
140 timer->expires = jiffies + interval;
141 add_timer(timer);
142
143 return 0;
144}
145
146static int mv_otg_reset(struct mv_otg *mvotg)
147{
148 unsigned int loops;
149 u32 tmp;
150
151 /* Stop the controller */
152 tmp = readl(&mvotg->op_regs->usbcmd);
153 tmp &= ~USBCMD_RUN_STOP;
154 writel(tmp, &mvotg->op_regs->usbcmd);
155
156 /* Reset the controller to get default values */
157 writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
158
159 loops = 500;
160 while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
161 if (loops == 0) {
162 dev_err(&mvotg->pdev->dev,
163 "Wait for RESET completed TIMEOUT\n");
164 return -ETIMEDOUT;
165 }
166 loops--;
167 udelay(20);
168 }
169
170 writel(0x0, &mvotg->op_regs->usbintr);
171 tmp = readl(&mvotg->op_regs->usbsts);
172 writel(tmp, &mvotg->op_regs->usbsts);
173
174 return 0;
175}
176
177static void mv_otg_init_irq(struct mv_otg *mvotg)
178{
179 u32 otgsc;
180
181 mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID
182 | OTGSC_INTR_A_VBUS_VALID;
183 mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID
184 | OTGSC_INTSTS_A_VBUS_VALID;
185
186 if (mvotg->pdata->vbus == NULL) {
187 mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID
188 | OTGSC_INTR_B_SESSION_END;
189 mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID
190 | OTGSC_INTSTS_B_SESSION_END;
191 }
192
193 if (mvotg->pdata->id == NULL) {
194 mvotg->irq_en |= OTGSC_INTR_USB_ID;
195 mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
196 }
197
198 otgsc = readl(&mvotg->op_regs->otgsc);
199 otgsc |= mvotg->irq_en;
200 writel(otgsc, &mvotg->op_regs->otgsc);
201}
202
203static void mv_otg_start_host(struct mv_otg *mvotg, int on)
204{
205 struct otg_transceiver *otg = &mvotg->otg;
206 struct usb_hcd *hcd;
207
208 if (!otg->host)
209 return;
210
211 dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
212
213 hcd = bus_to_hcd(otg->host);
214
215 if (on)
216 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
217 else
218 usb_remove_hcd(hcd);
219}
220
221static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
222{
223 struct otg_transceiver *otg = &mvotg->otg;
224
225 if (!otg->gadget)
226 return;
227
228 dev_info(otg->dev, "gadget %s\n", on ? "on" : "off");
229
230 if (on)
231 usb_gadget_vbus_connect(otg->gadget);
232 else
233 usb_gadget_vbus_disconnect(otg->gadget);
234}
235
236static void otg_clock_enable(struct mv_otg *mvotg)
237{
238 unsigned int i;
239
240 for (i = 0; i < mvotg->clknum; i++)
241 clk_enable(mvotg->clk[i]);
242}
243
244static void otg_clock_disable(struct mv_otg *mvotg)
245{
246 unsigned int i;
247
248 for (i = 0; i < mvotg->clknum; i++)
249 clk_disable(mvotg->clk[i]);
250}
251
252static int mv_otg_enable_internal(struct mv_otg *mvotg)
253{
254 int retval = 0;
255
256 if (mvotg->active)
257 return 0;
258
259 dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
260
261 otg_clock_enable(mvotg);
262 if (mvotg->pdata->phy_init) {
263 retval = mvotg->pdata->phy_init(mvotg->phy_regs);
264 if (retval) {
265 dev_err(&mvotg->pdev->dev,
266 "init phy error %d\n", retval);
267 otg_clock_disable(mvotg);
268 return retval;
269 }
270 }
271 mvotg->active = 1;
272
273 return 0;
274
275}
276
277static int mv_otg_enable(struct mv_otg *mvotg)
278{
279 if (mvotg->clock_gating)
280 return mv_otg_enable_internal(mvotg);
281
282 return 0;
283}
284
285static void mv_otg_disable_internal(struct mv_otg *mvotg)
286{
287 if (mvotg->active) {
288 dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
289 if (mvotg->pdata->phy_deinit)
290 mvotg->pdata->phy_deinit(mvotg->phy_regs);
291 otg_clock_disable(mvotg);
292 mvotg->active = 0;
293 }
294}
295
296static void mv_otg_disable(struct mv_otg *mvotg)
297{
298 if (mvotg->clock_gating)
299 mv_otg_disable_internal(mvotg);
300}
301
302static void mv_otg_update_inputs(struct mv_otg *mvotg)
303{
304 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
305 u32 otgsc;
306
307 otgsc = readl(&mvotg->op_regs->otgsc);
308
309 if (mvotg->pdata->vbus) {
310 if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
311 otg_ctrl->b_sess_vld = 1;
312 otg_ctrl->b_sess_end = 0;
313 } else {
314 otg_ctrl->b_sess_vld = 0;
315 otg_ctrl->b_sess_end = 1;
316 }
317 } else {
318 otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
319 otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
320 }
321
322 if (mvotg->pdata->id)
323 otg_ctrl->id = !!mvotg->pdata->id->poll();
324 else
325 otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
326
327 if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
328 otg_ctrl->a_bus_req = 1;
329
330 otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
331 otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
332
333 dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
334 dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
335 dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
336 dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
337 dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
338 dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
339}
340
341static void mv_otg_update_state(struct mv_otg *mvotg)
342{
343 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
344 struct otg_transceiver *otg = &mvotg->otg;
345 int old_state = otg->state;
346
347 switch (old_state) {
348 case OTG_STATE_UNDEFINED:
349 otg->state = OTG_STATE_B_IDLE;
350 /* FALL THROUGH */
351 case OTG_STATE_B_IDLE:
352 if (otg_ctrl->id == 0)
353 otg->state = OTG_STATE_A_IDLE;
354 else if (otg_ctrl->b_sess_vld)
355 otg->state = OTG_STATE_B_PERIPHERAL;
356 break;
357 case OTG_STATE_B_PERIPHERAL:
358 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
359 otg->state = OTG_STATE_B_IDLE;
360 break;
361 case OTG_STATE_A_IDLE:
362 if (otg_ctrl->id)
363 otg->state = OTG_STATE_B_IDLE;
364 else if (!(otg_ctrl->a_bus_drop) &&
365 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
366 otg->state = OTG_STATE_A_WAIT_VRISE;
367 break;
368 case OTG_STATE_A_WAIT_VRISE:
369 if (otg_ctrl->a_vbus_vld)
370 otg->state = OTG_STATE_A_WAIT_BCON;
371 break;
372 case OTG_STATE_A_WAIT_BCON:
373 if (otg_ctrl->id || otg_ctrl->a_bus_drop
374 || otg_ctrl->a_wait_bcon_timeout) {
375 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
376 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
377 otg->state = OTG_STATE_A_WAIT_VFALL;
378 otg_ctrl->a_bus_req = 0;
379 } else if (!otg_ctrl->a_vbus_vld) {
380 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
381 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
382 otg->state = OTG_STATE_A_VBUS_ERR;
383 } else if (otg_ctrl->b_conn) {
384 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
385 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
386 otg->state = OTG_STATE_A_HOST;
387 }
388 break;
389 case OTG_STATE_A_HOST:
390 if (otg_ctrl->id || !otg_ctrl->b_conn
391 || otg_ctrl->a_bus_drop)
392 otg->state = OTG_STATE_A_WAIT_BCON;
393 else if (!otg_ctrl->a_vbus_vld)
394 otg->state = OTG_STATE_A_VBUS_ERR;
395 break;
396 case OTG_STATE_A_WAIT_VFALL:
397 if (otg_ctrl->id
398 || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
399 || otg_ctrl->a_bus_req)
400 otg->state = OTG_STATE_A_IDLE;
401 break;
402 case OTG_STATE_A_VBUS_ERR:
403 if (otg_ctrl->id || otg_ctrl->a_clr_err
404 || otg_ctrl->a_bus_drop) {
405 otg_ctrl->a_clr_err = 0;
406 otg->state = OTG_STATE_A_WAIT_VFALL;
407 }
408 break;
409 default:
410 break;
411 }
412}
413
414static void mv_otg_work(struct work_struct *work)
415{
416 struct mv_otg *mvotg;
417 struct otg_transceiver *otg;
418 int old_state;
419
420 mvotg = container_of((struct delayed_work *)work, struct mv_otg, work);
421
422run:
423 /* work queue is single thread, or we need spin_lock to protect */
424 otg = &mvotg->otg;
425 old_state = otg->state;
426
427 if (!mvotg->active)
428 return;
429
430 mv_otg_update_inputs(mvotg);
431 mv_otg_update_state(mvotg);
432
433 if (old_state != otg->state) {
434 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
435 state_string[old_state],
436 state_string[otg->state]);
437
438 switch (otg->state) {
439 case OTG_STATE_B_IDLE:
440 mvotg->otg.default_a = 0;
441 if (old_state == OTG_STATE_B_PERIPHERAL)
442 mv_otg_start_periphrals(mvotg, 0);
443 mv_otg_reset(mvotg);
444 mv_otg_disable(mvotg);
445 break;
446 case OTG_STATE_B_PERIPHERAL:
447 mv_otg_enable(mvotg);
448 mv_otg_start_periphrals(mvotg, 1);
449 break;
450 case OTG_STATE_A_IDLE:
451 mvotg->otg.default_a = 1;
452 mv_otg_enable(mvotg);
453 if (old_state == OTG_STATE_A_WAIT_VFALL)
454 mv_otg_start_host(mvotg, 0);
455 mv_otg_reset(mvotg);
456 break;
457 case OTG_STATE_A_WAIT_VRISE:
458 mv_otg_set_vbus(&mvotg->otg, 1);
459 break;
460 case OTG_STATE_A_WAIT_BCON:
461 if (old_state != OTG_STATE_A_HOST)
462 mv_otg_start_host(mvotg, 1);
463 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
464 T_A_WAIT_BCON,
465 mv_otg_timer_await_bcon);
466 /*
467 * Now, we directly enter A_HOST. So set b_conn = 1
468 * here. In fact, it need host driver to notify us.
469 */
470 mvotg->otg_ctrl.b_conn = 1;
471 break;
472 case OTG_STATE_A_HOST:
473 break;
474 case OTG_STATE_A_WAIT_VFALL:
475 /*
476 * Now, we has exited A_HOST. So set b_conn = 0
477 * here. In fact, it need host driver to notify us.
478 */
479 mvotg->otg_ctrl.b_conn = 0;
480 mv_otg_set_vbus(&mvotg->otg, 0);
481 break;
482 case OTG_STATE_A_VBUS_ERR:
483 break;
484 default:
485 break;
486 }
487 goto run;
488 }
489}
490
491static irqreturn_t mv_otg_irq(int irq, void *dev)
492{
493 struct mv_otg *mvotg = dev;
494 u32 otgsc;
495
496 otgsc = readl(&mvotg->op_regs->otgsc);
497 writel(otgsc, &mvotg->op_regs->otgsc);
498
499 /*
500 * if we have vbus, then the vbus detection for B-device
501 * will be done by mv_otg_inputs_irq().
502 */
503 if (mvotg->pdata->vbus)
504 if ((otgsc & OTGSC_STS_USB_ID) &&
505 !(otgsc & OTGSC_INTSTS_USB_ID))
506 return IRQ_NONE;
507
508 if ((otgsc & mvotg->irq_status) == 0)
509 return IRQ_NONE;
510
511 mv_otg_run_state_machine(mvotg, 0);
512
513 return IRQ_HANDLED;
514}
515
516static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
517{
518 struct mv_otg *mvotg = dev;
519
520 /* The clock may disabled at this time */
521 if (!mvotg->active) {
522 mv_otg_enable(mvotg);
523 mv_otg_init_irq(mvotg);
524 }
525
526 mv_otg_run_state_machine(mvotg, 0);
527
528 return IRQ_HANDLED;
529}
530
531static ssize_t
532get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
533{
534 struct mv_otg *mvotg = dev_get_drvdata(dev);
535 return scnprintf(buf, PAGE_SIZE, "%d\n",
536 mvotg->otg_ctrl.a_bus_req);
537}
538
539static ssize_t
540set_a_bus_req(struct device *dev, struct device_attribute *attr,
541 const char *buf, size_t count)
542{
543 struct mv_otg *mvotg = dev_get_drvdata(dev);
544
545 if (count > 2)
546 return -1;
547
548 /* We will use this interface to change to A device */
549 if (mvotg->otg.state != OTG_STATE_B_IDLE
550 && mvotg->otg.state != OTG_STATE_A_IDLE)
551 return -1;
552
553 /* The clock may disabled and we need to set irq for ID detected */
554 mv_otg_enable(mvotg);
555 mv_otg_init_irq(mvotg);
556
557 if (buf[0] == '1') {
558 mvotg->otg_ctrl.a_bus_req = 1;
559 mvotg->otg_ctrl.a_bus_drop = 0;
560 dev_dbg(&mvotg->pdev->dev,
561 "User request: a_bus_req = 1\n");
562
563 if (spin_trylock(&mvotg->wq_lock)) {
564 mv_otg_run_state_machine(mvotg, 0);
565 spin_unlock(&mvotg->wq_lock);
566 }
567 }
568
569 return count;
570}
571
572static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
573 set_a_bus_req);
574
575static ssize_t
576set_a_clr_err(struct device *dev, struct device_attribute *attr,
577 const char *buf, size_t count)
578{
579 struct mv_otg *mvotg = dev_get_drvdata(dev);
580 if (!mvotg->otg.default_a)
581 return -1;
582
583 if (count > 2)
584 return -1;
585
586 if (buf[0] == '1') {
587 mvotg->otg_ctrl.a_clr_err = 1;
588 dev_dbg(&mvotg->pdev->dev,
589 "User request: a_clr_err = 1\n");
590 }
591
592 if (spin_trylock(&mvotg->wq_lock)) {
593 mv_otg_run_state_machine(mvotg, 0);
594 spin_unlock(&mvotg->wq_lock);
595 }
596
597 return count;
598}
599
600static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
601
602static ssize_t
603get_a_bus_drop(struct device *dev, struct device_attribute *attr,
604 char *buf)
605{
606 struct mv_otg *mvotg = dev_get_drvdata(dev);
607 return scnprintf(buf, PAGE_SIZE, "%d\n",
608 mvotg->otg_ctrl.a_bus_drop);
609}
610
611static ssize_t
612set_a_bus_drop(struct device *dev, struct device_attribute *attr,
613 const char *buf, size_t count)
614{
615 struct mv_otg *mvotg = dev_get_drvdata(dev);
616 if (!mvotg->otg.default_a)
617 return -1;
618
619 if (count > 2)
620 return -1;
621
622 if (buf[0] == '0') {
623 mvotg->otg_ctrl.a_bus_drop = 0;
624 dev_dbg(&mvotg->pdev->dev,
625 "User request: a_bus_drop = 0\n");
626 } else if (buf[0] == '1') {
627 mvotg->otg_ctrl.a_bus_drop = 1;
628 mvotg->otg_ctrl.a_bus_req = 0;
629 dev_dbg(&mvotg->pdev->dev,
630 "User request: a_bus_drop = 1\n");
631 dev_dbg(&mvotg->pdev->dev,
632 "User request: and a_bus_req = 0\n");
633 }
634
635 if (spin_trylock(&mvotg->wq_lock)) {
636 mv_otg_run_state_machine(mvotg, 0);
637 spin_unlock(&mvotg->wq_lock);
638 }
639
640 return count;
641}
642
643static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
644 get_a_bus_drop, set_a_bus_drop);
645
646static struct attribute *inputs_attrs[] = {
647 &dev_attr_a_bus_req.attr,
648 &dev_attr_a_clr_err.attr,
649 &dev_attr_a_bus_drop.attr,
650 NULL,
651};
652
653static struct attribute_group inputs_attr_group = {
654 .name = "inputs",
655 .attrs = inputs_attrs,
656};
657
658int mv_otg_remove(struct platform_device *pdev)
659{
660 struct mv_otg *mvotg = platform_get_drvdata(pdev);
661 int clk_i;
662
663 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
664
665 if (mvotg->irq)
666 free_irq(mvotg->irq, mvotg);
667
668 if (mvotg->pdata->vbus)
669 free_irq(mvotg->pdata->vbus->irq, mvotg);
670 if (mvotg->pdata->id)
671 free_irq(mvotg->pdata->id->irq, mvotg);
672
673 if (mvotg->qwork) {
674 flush_workqueue(mvotg->qwork);
675 destroy_workqueue(mvotg->qwork);
676 }
677
678 mv_otg_disable(mvotg);
679
680 if (mvotg->cap_regs)
681 iounmap(mvotg->cap_regs);
682
683 if (mvotg->phy_regs)
684 iounmap(mvotg->phy_regs);
685
686 for (clk_i = 0; clk_i <= mvotg->clknum; clk_i++)
687 clk_put(mvotg->clk[clk_i]);
688
689 otg_set_transceiver(NULL);
690 platform_set_drvdata(pdev, NULL);
691
692 kfree(mvotg);
693
694 return 0;
695}
696
697static int mv_otg_probe(struct platform_device *pdev)
698{
699 struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
700 struct mv_otg *mvotg;
701 struct resource *r;
702 int retval = 0, clk_i, i;
703 size_t size;
704
705 if (pdata == NULL) {
706 dev_err(&pdev->dev, "failed to get platform data\n");
707 return -ENODEV;
708 }
709
710 size = sizeof(*mvotg) + sizeof(struct clk *) * pdata->clknum;
711 mvotg = kzalloc(size, GFP_KERNEL);
712 if (!mvotg) {
713 dev_err(&pdev->dev, "failed to allocate memory!\n");
714 return -ENOMEM;
715 }
716
717 platform_set_drvdata(pdev, mvotg);
718
719 mvotg->pdev = pdev;
720 mvotg->pdata = pdata;
721
722 mvotg->clknum = pdata->clknum;
723 for (clk_i = 0; clk_i < mvotg->clknum; clk_i++) {
724 mvotg->clk[clk_i] = clk_get(&pdev->dev, pdata->clkname[clk_i]);
725 if (IS_ERR(mvotg->clk[clk_i])) {
726 retval = PTR_ERR(mvotg->clk[clk_i]);
727 goto err_put_clk;
728 }
729 }
730
731 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
732 if (!mvotg->qwork) {
733 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
734 retval = -ENOMEM;
735 goto err_put_clk;
736 }
737
738 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
739
740 /* OTG common part */
741 mvotg->pdev = pdev;
742 mvotg->otg.dev = &pdev->dev;
743 mvotg->otg.label = driver_name;
744 mvotg->otg.set_host = mv_otg_set_host;
745 mvotg->otg.set_peripheral = mv_otg_set_peripheral;
746 mvotg->otg.set_vbus = mv_otg_set_vbus;
747 mvotg->otg.state = OTG_STATE_UNDEFINED;
748
749 for (i = 0; i < OTG_TIMER_NUM; i++)
750 init_timer(&mvotg->otg_ctrl.timer[i]);
751
752 r = platform_get_resource_byname(mvotg->pdev,
753 IORESOURCE_MEM, "phyregs");
754 if (r == NULL) {
755 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
756 retval = -ENODEV;
757 goto err_destroy_workqueue;
758 }
759
760 mvotg->phy_regs = ioremap(r->start, resource_size(r));
761 if (mvotg->phy_regs == NULL) {
762 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
763 retval = -EFAULT;
764 goto err_destroy_workqueue;
765 }
766
767 r = platform_get_resource_byname(mvotg->pdev,
768 IORESOURCE_MEM, "capregs");
769 if (r == NULL) {
770 dev_err(&pdev->dev, "no I/O memory resource defined\n");
771 retval = -ENODEV;
772 goto err_unmap_phyreg;
773 }
774
775 mvotg->cap_regs = ioremap(r->start, resource_size(r));
776 if (mvotg->cap_regs == NULL) {
777 dev_err(&pdev->dev, "failed to map I/O memory\n");
778 retval = -EFAULT;
779 goto err_unmap_phyreg;
780 }
781
782 /* we will acces controller register, so enable the udc controller */
783 retval = mv_otg_enable_internal(mvotg);
784 if (retval) {
785 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
786 goto err_unmap_capreg;
787 }
788
789 mvotg->op_regs =
790 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
791 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
792
793 if (pdata->id) {
794 retval = request_threaded_irq(pdata->id->irq, NULL,
795 mv_otg_inputs_irq,
796 IRQF_ONESHOT, "id", mvotg);
797 if (retval) {
798 dev_info(&pdev->dev,
799 "Failed to request irq for ID\n");
800 pdata->id = NULL;
801 }
802 }
803
804 if (pdata->vbus) {
805 mvotg->clock_gating = 1;
806 retval = request_threaded_irq(pdata->vbus->irq, NULL,
807 mv_otg_inputs_irq,
808 IRQF_ONESHOT, "vbus", mvotg);
809 if (retval) {
810 dev_info(&pdev->dev,
811 "Failed to request irq for VBUS, "
812 "disable clock gating\n");
813 mvotg->clock_gating = 0;
814 pdata->vbus = NULL;
815 }
816 }
817
818 if (pdata->disable_otg_clock_gating)
819 mvotg->clock_gating = 0;
820
821 mv_otg_reset(mvotg);
822 mv_otg_init_irq(mvotg);
823
824 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
825 if (r == NULL) {
826 dev_err(&pdev->dev, "no IRQ resource defined\n");
827 retval = -ENODEV;
828 goto err_disable_clk;
829 }
830
831 mvotg->irq = r->start;
832 if (request_irq(mvotg->irq, mv_otg_irq, IRQF_SHARED,
833 driver_name, mvotg)) {
834 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
835 mvotg->irq);
836 mvotg->irq = 0;
837 retval = -ENODEV;
838 goto err_disable_clk;
839 }
840
841 retval = otg_set_transceiver(&mvotg->otg);
842 if (retval < 0) {
843 dev_err(&pdev->dev, "can't register transceiver, %d\n",
844 retval);
845 goto err_free_irq;
846 }
847
848 retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
849 if (retval < 0) {
850 dev_dbg(&pdev->dev,
851 "Can't register sysfs attr group: %d\n", retval);
852 goto err_set_transceiver;
853 }
854
855 spin_lock_init(&mvotg->wq_lock);
856 if (spin_trylock(&mvotg->wq_lock)) {
857 mv_otg_run_state_machine(mvotg, 2 * HZ);
858 spin_unlock(&mvotg->wq_lock);
859 }
860
861 dev_info(&pdev->dev,
862 "successful probe OTG device %s clock gating.\n",
863 mvotg->clock_gating ? "with" : "without");
864
865 return 0;
866
867err_set_transceiver:
868 otg_set_transceiver(NULL);
869err_free_irq:
870 free_irq(mvotg->irq, mvotg);
871err_disable_clk:
872 if (pdata->vbus)
873 free_irq(pdata->vbus->irq, mvotg);
874 if (pdata->id)
875 free_irq(pdata->id->irq, mvotg);
876 mv_otg_disable_internal(mvotg);
877err_unmap_capreg:
878 iounmap(mvotg->cap_regs);
879err_unmap_phyreg:
880 iounmap(mvotg->phy_regs);
881err_destroy_workqueue:
882 flush_workqueue(mvotg->qwork);
883 destroy_workqueue(mvotg->qwork);
884err_put_clk:
885 for (clk_i--; clk_i >= 0; clk_i--)
886 clk_put(mvotg->clk[clk_i]);
887
888 platform_set_drvdata(pdev, NULL);
889 kfree(mvotg);
890
891 return retval;
892}
893
894#ifdef CONFIG_PM
895static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
896{
897 struct mv_otg *mvotg = platform_get_drvdata(pdev);
898
899 if (mvotg->otg.state != OTG_STATE_B_IDLE) {
900 dev_info(&pdev->dev,
901 "OTG state is not B_IDLE, it is %d!\n",
902 mvotg->otg.state);
903 return -EAGAIN;
904 }
905
906 if (!mvotg->clock_gating)
907 mv_otg_disable_internal(mvotg);
908
909 return 0;
910}
911
912static int mv_otg_resume(struct platform_device *pdev)
913{
914 struct mv_otg *mvotg = platform_get_drvdata(pdev);
915 u32 otgsc;
916
917 if (!mvotg->clock_gating) {
918 mv_otg_enable_internal(mvotg);
919
920 otgsc = readl(&mvotg->op_regs->otgsc);
921 otgsc |= mvotg->irq_en;
922 writel(otgsc, &mvotg->op_regs->otgsc);
923
924 if (spin_trylock(&mvotg->wq_lock)) {
925 mv_otg_run_state_machine(mvotg, 0);
926 spin_unlock(&mvotg->wq_lock);
927 }
928 }
929 return 0;
930}
931#endif
932
933static struct platform_driver mv_otg_driver = {
934 .probe = mv_otg_probe,
935 .remove = __exit_p(mv_otg_remove),
936 .driver = {
937 .owner = THIS_MODULE,
938 .name = driver_name,
939 },
940#ifdef CONFIG_PM
941 .suspend = mv_otg_suspend,
942 .resume = mv_otg_resume,
943#endif
944};
945
946static int __init mv_otg_init(void)
947{
948 return platform_driver_register(&mv_otg_driver);
949}
950
951static void __exit mv_otg_exit(void)
952{
953 platform_driver_unregister(&mv_otg_driver);
954}
955
956module_init(mv_otg_init);
957module_exit(mv_otg_exit);
Linux 6.x block layer and io_uring tree(s)