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>
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[] = {
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)
63 return mvotg->pdata->set_vbus(on);
66 static int mv_otg_set_host(struct usb_otg *otg,
74 static int mv_otg_set_peripheral(struct usb_otg *otg,
75 struct usb_gadget *gadget)
82 static void mv_otg_run_state_machine(struct mv_otg *mvotg,
85 dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
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)
113 timer = &mvotg->otg_ctrl.timer[id];
115 if (timer_pending(timer))
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)
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);
137 timer->data = (unsigned long) mvotg;
138 timer->function = callback;
139 timer->expires = jiffies + interval;
145 static int mv_otg_reset(struct mv_otg *mvotg)
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);
159 while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
161 dev_err(&mvotg->pdev->dev,
162 "Wait for RESET completed TIMEOUT\n");
169 writel(0x0, &mvotg->op_regs->usbintr);
170 tmp = readl(&mvotg->op_regs->usbsts);
171 writel(tmp, &mvotg->op_regs->usbsts);
176 static void mv_otg_init_irq(struct mv_otg *mvotg)
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)
205 struct usb_otg *otg = mvotg->phy.otg;
211 dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
213 hcd = bus_to_hcd(otg->host);
216 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
217 device_wakeup_enable(hcd->self.controller);
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;
231 dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
234 usb_gadget_vbus_connect(otg->gadget);
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)
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);
262 dev_err(&mvotg->pdev->dev,
263 "init phy error %d\n", retval);
264 otg_clock_disable(mvotg);
274 static int mv_otg_enable(struct mv_otg *mvotg)
276 if (mvotg->clock_gating)
277 return mv_otg_enable_internal(mvotg);
282 static void mv_otg_disable_internal(struct mv_otg *mvotg)
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);
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;
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;
311 otg_ctrl->b_sess_vld = 0;
312 otg_ctrl->b_sess_end = 1;
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();
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 struct usb_phy *phy = &mvotg->phy;
342 int old_state = mvotg->phy.otg->state;
345 case OTG_STATE_UNDEFINED:
346 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
348 case OTG_STATE_B_IDLE:
349 if (otg_ctrl->id == 0)
350 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
351 else if (otg_ctrl->b_sess_vld)
352 mvotg->phy.otg->state = OTG_STATE_B_PERIPHERAL;
354 case OTG_STATE_B_PERIPHERAL:
355 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
356 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
358 case OTG_STATE_A_IDLE:
360 mvotg->phy.otg->state = OTG_STATE_B_IDLE;
361 else if (!(otg_ctrl->a_bus_drop) &&
362 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
363 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
365 case OTG_STATE_A_WAIT_VRISE:
366 if (otg_ctrl->a_vbus_vld)
367 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
369 case OTG_STATE_A_WAIT_BCON:
370 if (otg_ctrl->id || otg_ctrl->a_bus_drop
371 || otg_ctrl->a_wait_bcon_timeout) {
372 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
373 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
374 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
375 otg_ctrl->a_bus_req = 0;
376 } else if (!otg_ctrl->a_vbus_vld) {
377 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
378 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
379 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
380 } else if (otg_ctrl->b_conn) {
381 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
382 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
383 mvotg->phy.otg->state = OTG_STATE_A_HOST;
386 case OTG_STATE_A_HOST:
387 if (otg_ctrl->id || !otg_ctrl->b_conn
388 || otg_ctrl->a_bus_drop)
389 mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
390 else if (!otg_ctrl->a_vbus_vld)
391 mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
393 case OTG_STATE_A_WAIT_VFALL:
395 || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
396 || otg_ctrl->a_bus_req)
397 mvotg->phy.otg->state = OTG_STATE_A_IDLE;
399 case OTG_STATE_A_VBUS_ERR:
400 if (otg_ctrl->id || otg_ctrl->a_clr_err
401 || otg_ctrl->a_bus_drop) {
402 otg_ctrl->a_clr_err = 0;
403 mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
411 static void mv_otg_work(struct work_struct *work)
413 struct mv_otg *mvotg;
418 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
421 /* work queue is single thread, or we need spin_lock to protect */
423 otg = mvotg->phy.otg;
424 old_state = otg->state;
429 mv_otg_update_inputs(mvotg);
430 mv_otg_update_state(mvotg);
432 if (old_state != mvotg->phy.otg->state) {
433 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
434 state_string[old_state],
435 state_string[mvotg->phy.otg->state]);
437 switch (mvotg->phy.otg->state) {
438 case OTG_STATE_B_IDLE:
440 if (old_state == OTG_STATE_B_PERIPHERAL)
441 mv_otg_start_periphrals(mvotg, 0);
443 mv_otg_disable(mvotg);
444 usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE);
446 case OTG_STATE_B_PERIPHERAL:
447 mv_otg_enable(mvotg);
448 mv_otg_start_periphrals(mvotg, 1);
449 usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED);
451 case OTG_STATE_A_IDLE:
453 mv_otg_enable(mvotg);
454 if (old_state == OTG_STATE_A_WAIT_VFALL)
455 mv_otg_start_host(mvotg, 0);
458 case OTG_STATE_A_WAIT_VRISE:
459 mv_otg_set_vbus(otg, 1);
461 case OTG_STATE_A_WAIT_BCON:
462 if (old_state != OTG_STATE_A_HOST)
463 mv_otg_start_host(mvotg, 1);
464 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
466 mv_otg_timer_await_bcon);
468 * Now, we directly enter A_HOST. So set b_conn = 1
469 * here. In fact, it need host driver to notify us.
471 mvotg->otg_ctrl.b_conn = 1;
473 case OTG_STATE_A_HOST:
475 case OTG_STATE_A_WAIT_VFALL:
477 * Now, we has exited A_HOST. So set b_conn = 0
478 * here. In fact, it need host driver to notify us.
480 mvotg->otg_ctrl.b_conn = 0;
481 mv_otg_set_vbus(otg, 0);
483 case OTG_STATE_A_VBUS_ERR:
492 static irqreturn_t mv_otg_irq(int irq, void *dev)
494 struct mv_otg *mvotg = dev;
497 otgsc = readl(&mvotg->op_regs->otgsc);
498 writel(otgsc, &mvotg->op_regs->otgsc);
501 * if we have vbus, then the vbus detection for B-device
502 * will be done by mv_otg_inputs_irq().
504 if (mvotg->pdata->vbus)
505 if ((otgsc & OTGSC_STS_USB_ID) &&
506 !(otgsc & OTGSC_INTSTS_USB_ID))
509 if ((otgsc & mvotg->irq_status) == 0)
512 mv_otg_run_state_machine(mvotg, 0);
517 static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
519 struct mv_otg *mvotg = dev;
521 /* The clock may disabled at this time */
522 if (!mvotg->active) {
523 mv_otg_enable(mvotg);
524 mv_otg_init_irq(mvotg);
527 mv_otg_run_state_machine(mvotg, 0);
533 get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
535 struct mv_otg *mvotg = dev_get_drvdata(dev);
536 return scnprintf(buf, PAGE_SIZE, "%d\n",
537 mvotg->otg_ctrl.a_bus_req);
541 set_a_bus_req(struct device *dev, struct device_attribute *attr,
542 const char *buf, size_t count)
544 struct mv_otg *mvotg = dev_get_drvdata(dev);
549 /* We will use this interface to change to A device */
550 if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
551 && mvotg->phy.otg->state != OTG_STATE_A_IDLE)
554 /* The clock may disabled and we need to set irq for ID detected */
555 mv_otg_enable(mvotg);
556 mv_otg_init_irq(mvotg);
559 mvotg->otg_ctrl.a_bus_req = 1;
560 mvotg->otg_ctrl.a_bus_drop = 0;
561 dev_dbg(&mvotg->pdev->dev,
562 "User request: a_bus_req = 1\n");
564 if (spin_trylock(&mvotg->wq_lock)) {
565 mv_otg_run_state_machine(mvotg, 0);
566 spin_unlock(&mvotg->wq_lock);
573 static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
577 set_a_clr_err(struct device *dev, struct device_attribute *attr,
578 const char *buf, size_t count)
580 struct mv_otg *mvotg = dev_get_drvdata(dev);
581 if (!mvotg->phy.otg->default_a)
588 mvotg->otg_ctrl.a_clr_err = 1;
589 dev_dbg(&mvotg->pdev->dev,
590 "User request: a_clr_err = 1\n");
593 if (spin_trylock(&mvotg->wq_lock)) {
594 mv_otg_run_state_machine(mvotg, 0);
595 spin_unlock(&mvotg->wq_lock);
601 static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
604 get_a_bus_drop(struct device *dev, struct device_attribute *attr,
607 struct mv_otg *mvotg = dev_get_drvdata(dev);
608 return scnprintf(buf, PAGE_SIZE, "%d\n",
609 mvotg->otg_ctrl.a_bus_drop);
613 set_a_bus_drop(struct device *dev, struct device_attribute *attr,
614 const char *buf, size_t count)
616 struct mv_otg *mvotg = dev_get_drvdata(dev);
617 if (!mvotg->phy.otg->default_a)
624 mvotg->otg_ctrl.a_bus_drop = 0;
625 dev_dbg(&mvotg->pdev->dev,
626 "User request: a_bus_drop = 0\n");
627 } else if (buf[0] == '1') {
628 mvotg->otg_ctrl.a_bus_drop = 1;
629 mvotg->otg_ctrl.a_bus_req = 0;
630 dev_dbg(&mvotg->pdev->dev,
631 "User request: a_bus_drop = 1\n");
632 dev_dbg(&mvotg->pdev->dev,
633 "User request: and a_bus_req = 0\n");
636 if (spin_trylock(&mvotg->wq_lock)) {
637 mv_otg_run_state_machine(mvotg, 0);
638 spin_unlock(&mvotg->wq_lock);
644 static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
645 get_a_bus_drop, set_a_bus_drop);
647 static struct attribute *inputs_attrs[] = {
648 &dev_attr_a_bus_req.attr,
649 &dev_attr_a_clr_err.attr,
650 &dev_attr_a_bus_drop.attr,
654 static struct attribute_group inputs_attr_group = {
656 .attrs = inputs_attrs,
659 static int mv_otg_remove(struct platform_device *pdev)
661 struct mv_otg *mvotg = platform_get_drvdata(pdev);
663 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
666 flush_workqueue(mvotg->qwork);
667 destroy_workqueue(mvotg->qwork);
670 mv_otg_disable(mvotg);
672 usb_remove_phy(&mvotg->phy);
677 static int mv_otg_probe(struct platform_device *pdev)
679 struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
680 struct mv_otg *mvotg;
686 dev_err(&pdev->dev, "failed to get platform data\n");
690 mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
694 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
698 platform_set_drvdata(pdev, mvotg);
701 mvotg->pdata = pdata;
703 mvotg->clk = devm_clk_get(&pdev->dev, NULL);
704 if (IS_ERR(mvotg->clk))
705 return PTR_ERR(mvotg->clk);
707 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
709 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
713 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
715 /* OTG common part */
717 mvotg->phy.dev = &pdev->dev;
718 mvotg->phy.otg = otg;
719 mvotg->phy.label = driver_name;
721 otg->state = OTG_STATE_UNDEFINED;
722 otg->usb_phy = &mvotg->phy;
723 otg->set_host = mv_otg_set_host;
724 otg->set_peripheral = mv_otg_set_peripheral;
725 otg->set_vbus = mv_otg_set_vbus;
727 for (i = 0; i < OTG_TIMER_NUM; i++)
728 init_timer(&mvotg->otg_ctrl.timer[i]);
730 r = platform_get_resource_byname(mvotg->pdev,
731 IORESOURCE_MEM, "phyregs");
733 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
735 goto err_destroy_workqueue;
738 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
739 if (mvotg->phy_regs == NULL) {
740 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
742 goto err_destroy_workqueue;
745 r = platform_get_resource_byname(mvotg->pdev,
746 IORESOURCE_MEM, "capregs");
748 dev_err(&pdev->dev, "no I/O memory resource defined\n");
750 goto err_destroy_workqueue;
753 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
754 if (mvotg->cap_regs == NULL) {
755 dev_err(&pdev->dev, "failed to map I/O memory\n");
757 goto err_destroy_workqueue;
760 /* we will acces controller register, so enable the udc controller */
761 retval = mv_otg_enable_internal(mvotg);
763 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
764 goto err_destroy_workqueue;
768 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
769 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
772 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
773 NULL, mv_otg_inputs_irq,
774 IRQF_ONESHOT, "id", mvotg);
777 "Failed to request irq for ID\n");
783 mvotg->clock_gating = 1;
784 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
785 NULL, mv_otg_inputs_irq,
786 IRQF_ONESHOT, "vbus", mvotg);
789 "Failed to request irq for VBUS, "
790 "disable clock gating\n");
791 mvotg->clock_gating = 0;
796 if (pdata->disable_otg_clock_gating)
797 mvotg->clock_gating = 0;
800 mv_otg_init_irq(mvotg);
802 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
804 dev_err(&pdev->dev, "no IRQ resource defined\n");
806 goto err_disable_clk;
809 mvotg->irq = r->start;
810 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
811 driver_name, mvotg)) {
812 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
816 goto err_disable_clk;
819 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
821 dev_err(&pdev->dev, "can't register transceiver, %d\n",
823 goto err_disable_clk;
826 retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
829 "Can't register sysfs attr group: %d\n", retval);
833 spin_lock_init(&mvotg->wq_lock);
834 if (spin_trylock(&mvotg->wq_lock)) {
835 mv_otg_run_state_machine(mvotg, 2 * HZ);
836 spin_unlock(&mvotg->wq_lock);
840 "successful probe OTG device %s clock gating.\n",
841 mvotg->clock_gating ? "with" : "without");
846 usb_remove_phy(&mvotg->phy);
848 mv_otg_disable_internal(mvotg);
849 err_destroy_workqueue:
850 flush_workqueue(mvotg->qwork);
851 destroy_workqueue(mvotg->qwork);
857 static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
859 struct mv_otg *mvotg = platform_get_drvdata(pdev);
861 if (mvotg->phy.state != OTG_STATE_B_IDLE) {
863 "OTG state is not B_IDLE, it is %d!\n",
868 if (!mvotg->clock_gating)
869 mv_otg_disable_internal(mvotg);
874 static int mv_otg_resume(struct platform_device *pdev)
876 struct mv_otg *mvotg = platform_get_drvdata(pdev);
879 if (!mvotg->clock_gating) {
880 mv_otg_enable_internal(mvotg);
882 otgsc = readl(&mvotg->op_regs->otgsc);
883 otgsc |= mvotg->irq_en;
884 writel(otgsc, &mvotg->op_regs->otgsc);
886 if (spin_trylock(&mvotg->wq_lock)) {
887 mv_otg_run_state_machine(mvotg, 0);
888 spin_unlock(&mvotg->wq_lock);
895 static struct platform_driver mv_otg_driver = {
896 .probe = mv_otg_probe,
897 .remove = mv_otg_remove,
902 .suspend = mv_otg_suspend,
903 .resume = mv_otg_resume,
906 module_platform_driver(mv_otg_driver);