NFS: Don't clear desc->pg_moreio in nfs_do_recoalesce()
[linux/fpc-iii.git] / drivers / usb / phy / phy-mv-usb.c
blob697a741a0cb1ed36ff336af31d8c3cd7d2fd32a5
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>
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.
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/io.h>
15 #include <linux/uaccess.h>
16 #include <linux/device.h>
17 #include <linux/proc_fs.h>
18 #include <linux/clk.h>
19 #include <linux/workqueue.h>
20 #include <linux/platform_device.h>
22 #include <linux/usb.h>
23 #include <linux/usb/ch9.h>
24 #include <linux/usb/otg.h>
25 #include <linux/usb/gadget.h>
26 #include <linux/usb/hcd.h>
27 #include <linux/platform_data/mv_usb.h>
29 #include "phy-mv-usb.h"
31 #define DRIVER_DESC "Marvell USB OTG transceiver driver"
32 #define DRIVER_VERSION "Jan 20, 2010"
34 MODULE_DESCRIPTION(DRIVER_DESC);
35 MODULE_VERSION(DRIVER_VERSION);
36 MODULE_LICENSE("GPL");
38 static const char driver_name[] = "mv-otg";
40 static char *state_string[] = {
41 "undefined",
42 "b_idle",
43 "b_srp_init",
44 "b_peripheral",
45 "b_wait_acon",
46 "b_host",
47 "a_idle",
48 "a_wait_vrise",
49 "a_wait_bcon",
50 "a_host",
51 "a_suspend",
52 "a_peripheral",
53 "a_wait_vfall",
54 "a_vbus_err"
57 static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
59 struct mv_otg *mvotg = container_of(otg->usb_phy, struct mv_otg, phy);
60 if (mvotg->pdata->set_vbus == NULL)
61 return -ENODEV;
63 return mvotg->pdata->set_vbus(on);
66 static int mv_otg_set_host(struct usb_otg *otg,
67 struct usb_bus *host)
69 otg->host = host;
71 return 0;
74 static int mv_otg_set_peripheral(struct usb_otg *otg,
75 struct usb_gadget *gadget)
77 otg->gadget = gadget;
79 return 0;
82 static void mv_otg_run_state_machine(struct mv_otg *mvotg,
83 unsigned long delay)
85 dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
86 if (!mvotg->qwork)
87 return;
89 queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
92 static void mv_otg_timer_await_bcon(unsigned long data)
94 struct mv_otg *mvotg = (struct mv_otg *) data;
96 mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
98 dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
100 if (spin_trylock(&mvotg->wq_lock)) {
101 mv_otg_run_state_machine(mvotg, 0);
102 spin_unlock(&mvotg->wq_lock);
106 static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
108 struct timer_list *timer;
110 if (id >= OTG_TIMER_NUM)
111 return -EINVAL;
113 timer = &mvotg->otg_ctrl.timer[id];
115 if (timer_pending(timer))
116 del_timer(timer);
118 return 0;
121 static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
122 unsigned long interval,
123 void (*callback) (unsigned long))
125 struct timer_list *timer;
127 if (id >= OTG_TIMER_NUM)
128 return -EINVAL;
130 timer = &mvotg->otg_ctrl.timer[id];
131 if (timer_pending(timer)) {
132 dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id);
133 return -EBUSY;
136 init_timer(timer);
137 timer->data = (unsigned long) mvotg;
138 timer->function = callback;
139 timer->expires = jiffies + interval;
140 add_timer(timer);
142 return 0;
145 static int mv_otg_reset(struct mv_otg *mvotg)
147 unsigned int loops;
148 u32 tmp;
150 /* Stop the controller */
151 tmp = readl(&mvotg->op_regs->usbcmd);
152 tmp &= ~USBCMD_RUN_STOP;
153 writel(tmp, &mvotg->op_regs->usbcmd);
155 /* Reset the controller to get default values */
156 writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
158 loops = 500;
159 while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
160 if (loops == 0) {
161 dev_err(&mvotg->pdev->dev,
162 "Wait for RESET completed TIMEOUT\n");
163 return -ETIMEDOUT;
165 loops--;
166 udelay(20);
169 writel(0x0, &mvotg->op_regs->usbintr);
170 tmp = readl(&mvotg->op_regs->usbsts);
171 writel(tmp, &mvotg->op_regs->usbsts);
173 return 0;
176 static void mv_otg_init_irq(struct mv_otg *mvotg)
178 u32 otgsc;
180 mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID
181 | OTGSC_INTR_A_VBUS_VALID;
182 mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID
183 | OTGSC_INTSTS_A_VBUS_VALID;
185 if (mvotg->pdata->vbus == NULL) {
186 mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID
187 | OTGSC_INTR_B_SESSION_END;
188 mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID
189 | OTGSC_INTSTS_B_SESSION_END;
192 if (mvotg->pdata->id == NULL) {
193 mvotg->irq_en |= OTGSC_INTR_USB_ID;
194 mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
197 otgsc = readl(&mvotg->op_regs->otgsc);
198 otgsc |= mvotg->irq_en;
199 writel(otgsc, &mvotg->op_regs->otgsc);
202 static void mv_otg_start_host(struct mv_otg *mvotg, int on)
204 #ifdef CONFIG_USB
205 struct usb_otg *otg = mvotg->phy.otg;
206 struct usb_hcd *hcd;
208 if (!otg->host)
209 return;
211 dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
213 hcd = bus_to_hcd(otg->host);
215 if (on) {
216 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
217 device_wakeup_enable(hcd->self.controller);
218 } else {
219 usb_remove_hcd(hcd);
221 #endif /* CONFIG_USB */
224 static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
226 struct usb_otg *otg = mvotg->phy.otg;
228 if (!otg->gadget)
229 return;
231 dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
233 if (on)
234 usb_gadget_vbus_connect(otg->gadget);
235 else
236 usb_gadget_vbus_disconnect(otg->gadget);
239 static void otg_clock_enable(struct mv_otg *mvotg)
241 clk_prepare_enable(mvotg->clk);
244 static void otg_clock_disable(struct mv_otg *mvotg)
246 clk_disable_unprepare(mvotg->clk);
249 static int mv_otg_enable_internal(struct mv_otg *mvotg)
251 int retval = 0;
253 if (mvotg->active)
254 return 0;
256 dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
258 otg_clock_enable(mvotg);
259 if (mvotg->pdata->phy_init) {
260 retval = mvotg->pdata->phy_init(mvotg->phy_regs);
261 if (retval) {
262 dev_err(&mvotg->pdev->dev,
263 "init phy error %d\n", retval);
264 otg_clock_disable(mvotg);
265 return retval;
268 mvotg->active = 1;
270 return 0;
274 static int mv_otg_enable(struct mv_otg *mvotg)
276 if (mvotg->clock_gating)
277 return mv_otg_enable_internal(mvotg);
279 return 0;
282 static void mv_otg_disable_internal(struct mv_otg *mvotg)
284 if (mvotg->active) {
285 dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
286 if (mvotg->pdata->phy_deinit)
287 mvotg->pdata->phy_deinit(mvotg->phy_regs);
288 otg_clock_disable(mvotg);
289 mvotg->active = 0;
293 static void mv_otg_disable(struct mv_otg *mvotg)
295 if (mvotg->clock_gating)
296 mv_otg_disable_internal(mvotg);
299 static void mv_otg_update_inputs(struct mv_otg *mvotg)
301 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
302 u32 otgsc;
304 otgsc = readl(&mvotg->op_regs->otgsc);
306 if (mvotg->pdata->vbus) {
307 if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
308 otg_ctrl->b_sess_vld = 1;
309 otg_ctrl->b_sess_end = 0;
310 } else {
311 otg_ctrl->b_sess_vld = 0;
312 otg_ctrl->b_sess_end = 1;
314 } else {
315 otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
316 otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
319 if (mvotg->pdata->id)
320 otg_ctrl->id = !!mvotg->pdata->id->poll();
321 else
322 otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
324 if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
325 otg_ctrl->a_bus_req = 1;
327 otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
328 otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
330 dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
331 dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
332 dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
333 dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
334 dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
335 dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
338 static void mv_otg_update_state(struct mv_otg *mvotg)
340 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
341 int old_state = mvotg->phy.otg->state;
343 switch (old_state) {
344 case OTG_STATE_UNDEFINED:
345 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
346 /* FALL THROUGH */
347 case OTG_STATE_B_IDLE:
348 if (otg_ctrl->id == 0)
349 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
350 else if (otg_ctrl->b_sess_vld)
351 mvotg->phy.otg->state = OTG_STATE_B_PERIPHERAL;
352 break;
353 case OTG_STATE_B_PERIPHERAL:
354 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
355 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
356 break;
357 case OTG_STATE_A_IDLE:
358 if (otg_ctrl->id)
359 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
360 else if (!(otg_ctrl->a_bus_drop) &&
361 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
362 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
363 break;
364 case OTG_STATE_A_WAIT_VRISE:
365 if (otg_ctrl->a_vbus_vld)
366 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
367 break;
368 case OTG_STATE_A_WAIT_BCON:
369 if (otg_ctrl->id || otg_ctrl->a_bus_drop
370 || otg_ctrl->a_wait_bcon_timeout) {
371 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
372 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
373 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
374 otg_ctrl->a_bus_req = 0;
375 } else if (!otg_ctrl->a_vbus_vld) {
376 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
377 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
378 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
379 } else if (otg_ctrl->b_conn) {
380 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
381 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
382 mvotg->phy.otg->state = OTG_STATE_A_HOST;
384 break;
385 case OTG_STATE_A_HOST:
386 if (otg_ctrl->id || !otg_ctrl->b_conn
387 || otg_ctrl->a_bus_drop)
388 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
389 else if (!otg_ctrl->a_vbus_vld)
390 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
391 break;
392 case OTG_STATE_A_WAIT_VFALL:
393 if (otg_ctrl->id
394 || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
395 || otg_ctrl->a_bus_req)
396 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
397 break;
398 case OTG_STATE_A_VBUS_ERR:
399 if (otg_ctrl->id || otg_ctrl->a_clr_err
400 || otg_ctrl->a_bus_drop) {
401 otg_ctrl->a_clr_err = 0;
402 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
404 break;
405 default:
406 break;
410 static void mv_otg_work(struct work_struct *work)
412 struct mv_otg *mvotg;
413 struct usb_phy *phy;
414 struct usb_otg *otg;
415 int old_state;
417 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
419 run:
420 /* work queue is single thread, or we need spin_lock to protect */
421 phy = &mvotg->phy;
422 otg = mvotg->phy.otg;
423 old_state = otg->state;
425 if (!mvotg->active)
426 return;
428 mv_otg_update_inputs(mvotg);
429 mv_otg_update_state(mvotg);
431 if (old_state != mvotg->phy.otg->state) {
432 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
433 state_string[old_state],
434 state_string[mvotg->phy.otg->state]);
436 switch (mvotg->phy.otg->state) {
437 case OTG_STATE_B_IDLE:
438 otg->default_a = 0;
439 if (old_state == OTG_STATE_B_PERIPHERAL)
440 mv_otg_start_periphrals(mvotg, 0);
441 mv_otg_reset(mvotg);
442 mv_otg_disable(mvotg);
443 usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE);
444 break;
445 case OTG_STATE_B_PERIPHERAL:
446 mv_otg_enable(mvotg);
447 mv_otg_start_periphrals(mvotg, 1);
448 usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED);
449 break;
450 case OTG_STATE_A_IDLE:
451 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(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);
467 * Now, we directly enter A_HOST. So set b_conn = 1
468 * here. In fact, it need host driver to notify us.
470 mvotg->otg_ctrl.b_conn = 1;
471 break;
472 case OTG_STATE_A_HOST:
473 break;
474 case OTG_STATE_A_WAIT_VFALL:
476 * Now, we has exited A_HOST. So set b_conn = 0
477 * here. In fact, it need host driver to notify us.
479 mvotg->otg_ctrl.b_conn = 0;
480 mv_otg_set_vbus(otg, 0);
481 break;
482 case OTG_STATE_A_VBUS_ERR:
483 break;
484 default:
485 break;
487 goto run;
491 static irqreturn_t mv_otg_irq(int irq, void *dev)
493 struct mv_otg *mvotg = dev;
494 u32 otgsc;
496 otgsc = readl(&mvotg->op_regs->otgsc);
497 writel(otgsc, &mvotg->op_regs->otgsc);
500 * if we have vbus, then the vbus detection for B-device
501 * will be done by mv_otg_inputs_irq().
503 if (mvotg->pdata->vbus)
504 if ((otgsc & OTGSC_STS_USB_ID) &&
505 !(otgsc & OTGSC_INTSTS_USB_ID))
506 return IRQ_NONE;
508 if ((otgsc & mvotg->irq_status) == 0)
509 return IRQ_NONE;
511 mv_otg_run_state_machine(mvotg, 0);
513 return IRQ_HANDLED;
516 static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
518 struct mv_otg *mvotg = dev;
520 /* The clock may disabled at this time */
521 if (!mvotg->active) {
522 mv_otg_enable(mvotg);
523 mv_otg_init_irq(mvotg);
526 mv_otg_run_state_machine(mvotg, 0);
528 return IRQ_HANDLED;
531 static ssize_t
532 get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
534 struct mv_otg *mvotg = dev_get_drvdata(dev);
535 return scnprintf(buf, PAGE_SIZE, "%d\n",
536 mvotg->otg_ctrl.a_bus_req);
539 static ssize_t
540 set_a_bus_req(struct device *dev, struct device_attribute *attr,
541 const char *buf, size_t count)
543 struct mv_otg *mvotg = dev_get_drvdata(dev);
545 if (count > 2)
546 return -1;
548 /* We will use this interface to change to A device */
549 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
550 && mvotg->phy.otg->state != OTG_STATE_A_IDLE)
551 return -1;
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);
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");
563 if (spin_trylock(&mvotg->wq_lock)) {
564 mv_otg_run_state_machine(mvotg, 0);
565 spin_unlock(&mvotg->wq_lock);
569 return count;
572 static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
573 set_a_bus_req);
575 static ssize_t
576 set_a_clr_err(struct device *dev, struct device_attribute *attr,
577 const char *buf, size_t count)
579 struct mv_otg *mvotg = dev_get_drvdata(dev);
580 if (!mvotg->phy.otg->default_a)
581 return -1;
583 if (count > 2)
584 return -1;
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");
592 if (spin_trylock(&mvotg->wq_lock)) {
593 mv_otg_run_state_machine(mvotg, 0);
594 spin_unlock(&mvotg->wq_lock);
597 return count;
600 static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
602 static ssize_t
603 get_a_bus_drop(struct device *dev, struct device_attribute *attr,
604 char *buf)
606 struct mv_otg *mvotg = dev_get_drvdata(dev);
607 return scnprintf(buf, PAGE_SIZE, "%d\n",
608 mvotg->otg_ctrl.a_bus_drop);
611 static ssize_t
612 set_a_bus_drop(struct device *dev, struct device_attribute *attr,
613 const char *buf, size_t count)
615 struct mv_otg *mvotg = dev_get_drvdata(dev);
616 if (!mvotg->phy.otg->default_a)
617 return -1;
619 if (count > 2)
620 return -1;
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");
635 if (spin_trylock(&mvotg->wq_lock)) {
636 mv_otg_run_state_machine(mvotg, 0);
637 spin_unlock(&mvotg->wq_lock);
640 return count;
643 static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
644 get_a_bus_drop, set_a_bus_drop);
646 static 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,
653 static struct attribute_group inputs_attr_group = {
654 .name = "inputs",
655 .attrs = inputs_attrs,
658 static int mv_otg_remove(struct platform_device *pdev)
660 struct mv_otg *mvotg = platform_get_drvdata(pdev);
662 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
664 if (mvotg->qwork) {
665 flush_workqueue(mvotg->qwork);
666 destroy_workqueue(mvotg->qwork);
669 mv_otg_disable(mvotg);
671 usb_remove_phy(&mvotg->phy);
673 return 0;
676 static int mv_otg_probe(struct platform_device *pdev)
678 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
679 struct mv_otg *mvotg;
680 struct usb_otg *otg;
681 struct resource *r;
682 int retval = 0, i;
684 if (pdata == NULL) {
685 dev_err(&pdev->dev, "failed to get platform data\n");
686 return -ENODEV;
689 mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
690 if (!mvotg)
691 return -ENOMEM;
693 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
694 if (!otg)
695 return -ENOMEM;
697 platform_set_drvdata(pdev, mvotg);
699 mvotg->pdev = pdev;
700 mvotg->pdata = pdata;
702 mvotg->clk = devm_clk_get(&pdev->dev, NULL);
703 if (IS_ERR(mvotg->clk))
704 return PTR_ERR(mvotg->clk);
706 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
707 if (!mvotg->qwork) {
708 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
709 return -ENOMEM;
712 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
714 /* OTG common part */
715 mvotg->pdev = pdev;
716 mvotg->phy.dev = &pdev->dev;
717 mvotg->phy.otg = otg;
718 mvotg->phy.label = driver_name;
720 otg->state = OTG_STATE_UNDEFINED;
721 otg->usb_phy = &mvotg->phy;
722 otg->set_host = mv_otg_set_host;
723 otg->set_peripheral = mv_otg_set_peripheral;
724 otg->set_vbus = mv_otg_set_vbus;
726 for (i = 0; i < OTG_TIMER_NUM; i++)
727 init_timer(&mvotg->otg_ctrl.timer[i]);
729 r = platform_get_resource_byname(mvotg->pdev,
730 IORESOURCE_MEM, "phyregs");
731 if (r == NULL) {
732 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
733 retval = -ENODEV;
734 goto err_destroy_workqueue;
737 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
738 if (mvotg->phy_regs == NULL) {
739 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
740 retval = -EFAULT;
741 goto err_destroy_workqueue;
744 r = platform_get_resource_byname(mvotg->pdev,
745 IORESOURCE_MEM, "capregs");
746 if (r == NULL) {
747 dev_err(&pdev->dev, "no I/O memory resource defined\n");
748 retval = -ENODEV;
749 goto err_destroy_workqueue;
752 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
753 if (mvotg->cap_regs == NULL) {
754 dev_err(&pdev->dev, "failed to map I/O memory\n");
755 retval = -EFAULT;
756 goto err_destroy_workqueue;
759 /* we will acces controller register, so enable the udc controller */
760 retval = mv_otg_enable_internal(mvotg);
761 if (retval) {
762 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
763 goto err_destroy_workqueue;
766 mvotg->op_regs =
767 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
768 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
770 if (pdata->id) {
771 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
772 NULL, mv_otg_inputs_irq,
773 IRQF_ONESHOT, "id", mvotg);
774 if (retval) {
775 dev_info(&pdev->dev,
776 "Failed to request irq for ID\n");
777 pdata->id = NULL;
781 if (pdata->vbus) {
782 mvotg->clock_gating = 1;
783 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
784 NULL, mv_otg_inputs_irq,
785 IRQF_ONESHOT, "vbus", mvotg);
786 if (retval) {
787 dev_info(&pdev->dev,
788 "Failed to request irq for VBUS, "
789 "disable clock gating\n");
790 mvotg->clock_gating = 0;
791 pdata->vbus = NULL;
795 if (pdata->disable_otg_clock_gating)
796 mvotg->clock_gating = 0;
798 mv_otg_reset(mvotg);
799 mv_otg_init_irq(mvotg);
801 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
802 if (r == NULL) {
803 dev_err(&pdev->dev, "no IRQ resource defined\n");
804 retval = -ENODEV;
805 goto err_disable_clk;
808 mvotg->irq = r->start;
809 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
810 driver_name, mvotg)) {
811 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
812 mvotg->irq);
813 mvotg->irq = 0;
814 retval = -ENODEV;
815 goto err_disable_clk;
818 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
819 if (retval < 0) {
820 dev_err(&pdev->dev, "can't register transceiver, %d\n",
821 retval);
822 goto err_disable_clk;
825 retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
826 if (retval < 0) {
827 dev_dbg(&pdev->dev,
828 "Can't register sysfs attr group: %d\n", retval);
829 goto err_remove_phy;
832 spin_lock_init(&mvotg->wq_lock);
833 if (spin_trylock(&mvotg->wq_lock)) {
834 mv_otg_run_state_machine(mvotg, 2 * HZ);
835 spin_unlock(&mvotg->wq_lock);
838 dev_info(&pdev->dev,
839 "successful probe OTG device %s clock gating.\n",
840 mvotg->clock_gating ? "with" : "without");
842 return 0;
844 err_remove_phy:
845 usb_remove_phy(&mvotg->phy);
846 err_disable_clk:
847 mv_otg_disable_internal(mvotg);
848 err_destroy_workqueue:
849 flush_workqueue(mvotg->qwork);
850 destroy_workqueue(mvotg->qwork);
852 return retval;
855 #ifdef CONFIG_PM
856 static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
858 struct mv_otg *mvotg = platform_get_drvdata(pdev);
860 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE) {
861 dev_info(&pdev->dev,
862 "OTG state is not B_IDLE, it is %d!\n",
863 mvotg->phy.otg->state);
864 return -EAGAIN;
867 if (!mvotg->clock_gating)
868 mv_otg_disable_internal(mvotg);
870 return 0;
873 static int mv_otg_resume(struct platform_device *pdev)
875 struct mv_otg *mvotg = platform_get_drvdata(pdev);
876 u32 otgsc;
878 if (!mvotg->clock_gating) {
879 mv_otg_enable_internal(mvotg);
881 otgsc = readl(&mvotg->op_regs->otgsc);
882 otgsc |= mvotg->irq_en;
883 writel(otgsc, &mvotg->op_regs->otgsc);
885 if (spin_trylock(&mvotg->wq_lock)) {
886 mv_otg_run_state_machine(mvotg, 0);
887 spin_unlock(&mvotg->wq_lock);
890 return 0;
892 #endif
894 static struct platform_driver mv_otg_driver = {
895 .probe = mv_otg_probe,
896 .remove = mv_otg_remove,
897 .driver = {
898 .name = driver_name,
900 #ifdef CONFIG_PM
901 .suspend = mv_otg_suspend,
902 .resume = mv_otg_resume,
903 #endif
905 module_platform_driver(mv_otg_driver);