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/init.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>
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>
32 #define DRIVER_DESC "Marvell USB OTG transceiver driver"
33 #define DRIVER_VERSION "Jan 20, 2010"
35 MODULE_DESCRIPTION(DRIVER_DESC);
36 MODULE_VERSION(DRIVER_VERSION);
37 MODULE_LICENSE("GPL");
39 static const char driver_name[] = "mv-otg";
41 static char *state_string[] = {
58 static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
60 struct mv_otg *mvotg = container_of(otg->phy, struct mv_otg, phy);
61 if (mvotg->pdata->set_vbus == NULL)
64 return mvotg->pdata->set_vbus(on);
67 static int mv_otg_set_host(struct usb_otg *otg,
75 static int mv_otg_set_peripheral(struct usb_otg *otg,
76 struct usb_gadget *gadget)
83 static void mv_otg_run_state_machine(struct mv_otg *mvotg,
86 dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
90 queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
93 static void mv_otg_timer_await_bcon(unsigned long data)
95 struct mv_otg *mvotg = (struct mv_otg *) data;
97 mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
99 dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
101 if (spin_trylock(&mvotg->wq_lock)) {
102 mv_otg_run_state_machine(mvotg, 0);
103 spin_unlock(&mvotg->wq_lock);
107 static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
109 struct timer_list *timer;
111 if (id >= OTG_TIMER_NUM)
114 timer = &mvotg->otg_ctrl.timer[id];
116 if (timer_pending(timer))
122 static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
123 unsigned long interval,
124 void (*callback) (unsigned long))
126 struct timer_list *timer;
128 if (id >= OTG_TIMER_NUM)
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);
138 timer->data = (unsigned long) mvotg;
139 timer->function = callback;
140 timer->expires = jiffies + interval;
146 static int mv_otg_reset(struct mv_otg *mvotg)
151 /* Stop the controller */
152 tmp = readl(&mvotg->op_regs->usbcmd);
153 tmp &= ~USBCMD_RUN_STOP;
154 writel(tmp, &mvotg->op_regs->usbcmd);
156 /* Reset the controller to get default values */
157 writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
160 while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
162 dev_err(&mvotg->pdev->dev,
163 "Wait for RESET completed TIMEOUT\n");
170 writel(0x0, &mvotg->op_regs->usbintr);
171 tmp = readl(&mvotg->op_regs->usbsts);
172 writel(tmp, &mvotg->op_regs->usbsts);
177 static void mv_otg_init_irq(struct mv_otg *mvotg)
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;
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;
193 if (mvotg->pdata->id == NULL) {
194 mvotg->irq_en |= OTGSC_INTR_USB_ID;
195 mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
198 otgsc = readl(&mvotg->op_regs->otgsc);
199 otgsc |= mvotg->irq_en;
200 writel(otgsc, &mvotg->op_regs->otgsc);
203 static void mv_otg_start_host(struct mv_otg *mvotg, int on)
206 struct usb_otg *otg = mvotg->phy.otg;
212 dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
214 hcd = bus_to_hcd(otg->host);
217 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
220 #endif /* CONFIG_USB */
223 static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
225 struct usb_otg *otg = mvotg->phy.otg;
230 dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
233 usb_gadget_vbus_connect(otg->gadget);
235 usb_gadget_vbus_disconnect(otg->gadget);
238 static void otg_clock_enable(struct mv_otg *mvotg)
242 for (i = 0; i < mvotg->clknum; i++)
243 clk_enable(mvotg->clk[i]);
246 static void otg_clock_disable(struct mv_otg *mvotg)
250 for (i = 0; i < mvotg->clknum; i++)
251 clk_disable(mvotg->clk[i]);
254 static int mv_otg_enable_internal(struct mv_otg *mvotg)
261 dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
263 otg_clock_enable(mvotg);
264 if (mvotg->pdata->phy_init) {
265 retval = mvotg->pdata->phy_init(mvotg->phy_regs);
267 dev_err(&mvotg->pdev->dev,
268 "init phy error %d\n", retval);
269 otg_clock_disable(mvotg);
279 static int mv_otg_enable(struct mv_otg *mvotg)
281 if (mvotg->clock_gating)
282 return mv_otg_enable_internal(mvotg);
287 static void mv_otg_disable_internal(struct mv_otg *mvotg)
290 dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
291 if (mvotg->pdata->phy_deinit)
292 mvotg->pdata->phy_deinit(mvotg->phy_regs);
293 otg_clock_disable(mvotg);
298 static void mv_otg_disable(struct mv_otg *mvotg)
300 if (mvotg->clock_gating)
301 mv_otg_disable_internal(mvotg);
304 static void mv_otg_update_inputs(struct mv_otg *mvotg)
306 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
309 otgsc = readl(&mvotg->op_regs->otgsc);
311 if (mvotg->pdata->vbus) {
312 if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
313 otg_ctrl->b_sess_vld = 1;
314 otg_ctrl->b_sess_end = 0;
316 otg_ctrl->b_sess_vld = 0;
317 otg_ctrl->b_sess_end = 1;
320 otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
321 otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
324 if (mvotg->pdata->id)
325 otg_ctrl->id = !!mvotg->pdata->id->poll();
327 otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
329 if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
330 otg_ctrl->a_bus_req = 1;
332 otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
333 otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
335 dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
336 dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
337 dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
338 dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
339 dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
340 dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
343 static void mv_otg_update_state(struct mv_otg *mvotg)
345 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
346 struct usb_phy *phy = &mvotg->phy;
347 int old_state = phy->state;
350 case OTG_STATE_UNDEFINED:
351 phy->state = OTG_STATE_B_IDLE;
353 case OTG_STATE_B_IDLE:
354 if (otg_ctrl->id == 0)
355 phy->state = OTG_STATE_A_IDLE;
356 else if (otg_ctrl->b_sess_vld)
357 phy->state = OTG_STATE_B_PERIPHERAL;
359 case OTG_STATE_B_PERIPHERAL:
360 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
361 phy->state = OTG_STATE_B_IDLE;
363 case OTG_STATE_A_IDLE:
365 phy->state = OTG_STATE_B_IDLE;
366 else if (!(otg_ctrl->a_bus_drop) &&
367 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
368 phy->state = OTG_STATE_A_WAIT_VRISE;
370 case OTG_STATE_A_WAIT_VRISE:
371 if (otg_ctrl->a_vbus_vld)
372 phy->state = OTG_STATE_A_WAIT_BCON;
374 case OTG_STATE_A_WAIT_BCON:
375 if (otg_ctrl->id || otg_ctrl->a_bus_drop
376 || otg_ctrl->a_wait_bcon_timeout) {
377 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
378 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
379 phy->state = OTG_STATE_A_WAIT_VFALL;
380 otg_ctrl->a_bus_req = 0;
381 } else if (!otg_ctrl->a_vbus_vld) {
382 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
383 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
384 phy->state = OTG_STATE_A_VBUS_ERR;
385 } else if (otg_ctrl->b_conn) {
386 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
387 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
388 phy->state = OTG_STATE_A_HOST;
391 case OTG_STATE_A_HOST:
392 if (otg_ctrl->id || !otg_ctrl->b_conn
393 || otg_ctrl->a_bus_drop)
394 phy->state = OTG_STATE_A_WAIT_BCON;
395 else if (!otg_ctrl->a_vbus_vld)
396 phy->state = OTG_STATE_A_VBUS_ERR;
398 case OTG_STATE_A_WAIT_VFALL:
400 || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
401 || otg_ctrl->a_bus_req)
402 phy->state = OTG_STATE_A_IDLE;
404 case OTG_STATE_A_VBUS_ERR:
405 if (otg_ctrl->id || otg_ctrl->a_clr_err
406 || otg_ctrl->a_bus_drop) {
407 otg_ctrl->a_clr_err = 0;
408 phy->state = OTG_STATE_A_WAIT_VFALL;
416 static void mv_otg_work(struct work_struct *work)
418 struct mv_otg *mvotg;
423 mvotg = container_of((struct delayed_work *)work, struct mv_otg, work);
426 /* work queue is single thread, or we need spin_lock to protect */
429 old_state = phy->state;
434 mv_otg_update_inputs(mvotg);
435 mv_otg_update_state(mvotg);
437 if (old_state != phy->state) {
438 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
439 state_string[old_state],
440 state_string[phy->state]);
442 switch (phy->state) {
443 case OTG_STATE_B_IDLE:
445 if (old_state == OTG_STATE_B_PERIPHERAL)
446 mv_otg_start_periphrals(mvotg, 0);
448 mv_otg_disable(mvotg);
450 case OTG_STATE_B_PERIPHERAL:
451 mv_otg_enable(mvotg);
452 mv_otg_start_periphrals(mvotg, 1);
454 case OTG_STATE_A_IDLE:
456 mv_otg_enable(mvotg);
457 if (old_state == OTG_STATE_A_WAIT_VFALL)
458 mv_otg_start_host(mvotg, 0);
461 case OTG_STATE_A_WAIT_VRISE:
462 mv_otg_set_vbus(otg, 1);
464 case OTG_STATE_A_WAIT_BCON:
465 if (old_state != OTG_STATE_A_HOST)
466 mv_otg_start_host(mvotg, 1);
467 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
469 mv_otg_timer_await_bcon);
471 * Now, we directly enter A_HOST. So set b_conn = 1
472 * here. In fact, it need host driver to notify us.
474 mvotg->otg_ctrl.b_conn = 1;
476 case OTG_STATE_A_HOST:
478 case OTG_STATE_A_WAIT_VFALL:
480 * Now, we has exited A_HOST. So set b_conn = 0
481 * here. In fact, it need host driver to notify us.
483 mvotg->otg_ctrl.b_conn = 0;
484 mv_otg_set_vbus(otg, 0);
486 case OTG_STATE_A_VBUS_ERR:
495 static irqreturn_t mv_otg_irq(int irq, void *dev)
497 struct mv_otg *mvotg = dev;
500 otgsc = readl(&mvotg->op_regs->otgsc);
501 writel(otgsc, &mvotg->op_regs->otgsc);
504 * if we have vbus, then the vbus detection for B-device
505 * will be done by mv_otg_inputs_irq().
507 if (mvotg->pdata->vbus)
508 if ((otgsc & OTGSC_STS_USB_ID) &&
509 !(otgsc & OTGSC_INTSTS_USB_ID))
512 if ((otgsc & mvotg->irq_status) == 0)
515 mv_otg_run_state_machine(mvotg, 0);
520 static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
522 struct mv_otg *mvotg = dev;
524 /* The clock may disabled at this time */
525 if (!mvotg->active) {
526 mv_otg_enable(mvotg);
527 mv_otg_init_irq(mvotg);
530 mv_otg_run_state_machine(mvotg, 0);
536 get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
538 struct mv_otg *mvotg = dev_get_drvdata(dev);
539 return scnprintf(buf, PAGE_SIZE, "%d\n",
540 mvotg->otg_ctrl.a_bus_req);
544 set_a_bus_req(struct device *dev, struct device_attribute *attr,
545 const char *buf, size_t count)
547 struct mv_otg *mvotg = dev_get_drvdata(dev);
552 /* We will use this interface to change to A device */
553 if (mvotg->phy.state != OTG_STATE_B_IDLE
554 && mvotg->phy.state != OTG_STATE_A_IDLE)
557 /* The clock may disabled and we need to set irq for ID detected */
558 mv_otg_enable(mvotg);
559 mv_otg_init_irq(mvotg);
562 mvotg->otg_ctrl.a_bus_req = 1;
563 mvotg->otg_ctrl.a_bus_drop = 0;
564 dev_dbg(&mvotg->pdev->dev,
565 "User request: a_bus_req = 1\n");
567 if (spin_trylock(&mvotg->wq_lock)) {
568 mv_otg_run_state_machine(mvotg, 0);
569 spin_unlock(&mvotg->wq_lock);
576 static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
580 set_a_clr_err(struct device *dev, struct device_attribute *attr,
581 const char *buf, size_t count)
583 struct mv_otg *mvotg = dev_get_drvdata(dev);
584 if (!mvotg->phy.otg->default_a)
591 mvotg->otg_ctrl.a_clr_err = 1;
592 dev_dbg(&mvotg->pdev->dev,
593 "User request: a_clr_err = 1\n");
596 if (spin_trylock(&mvotg->wq_lock)) {
597 mv_otg_run_state_machine(mvotg, 0);
598 spin_unlock(&mvotg->wq_lock);
604 static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
607 get_a_bus_drop(struct device *dev, struct device_attribute *attr,
610 struct mv_otg *mvotg = dev_get_drvdata(dev);
611 return scnprintf(buf, PAGE_SIZE, "%d\n",
612 mvotg->otg_ctrl.a_bus_drop);
616 set_a_bus_drop(struct device *dev, struct device_attribute *attr,
617 const char *buf, size_t count)
619 struct mv_otg *mvotg = dev_get_drvdata(dev);
620 if (!mvotg->phy.otg->default_a)
627 mvotg->otg_ctrl.a_bus_drop = 0;
628 dev_dbg(&mvotg->pdev->dev,
629 "User request: a_bus_drop = 0\n");
630 } else if (buf[0] == '1') {
631 mvotg->otg_ctrl.a_bus_drop = 1;
632 mvotg->otg_ctrl.a_bus_req = 0;
633 dev_dbg(&mvotg->pdev->dev,
634 "User request: a_bus_drop = 1\n");
635 dev_dbg(&mvotg->pdev->dev,
636 "User request: and a_bus_req = 0\n");
639 if (spin_trylock(&mvotg->wq_lock)) {
640 mv_otg_run_state_machine(mvotg, 0);
641 spin_unlock(&mvotg->wq_lock);
647 static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
648 get_a_bus_drop, set_a_bus_drop);
650 static struct attribute *inputs_attrs[] = {
651 &dev_attr_a_bus_req.attr,
652 &dev_attr_a_clr_err.attr,
653 &dev_attr_a_bus_drop.attr,
657 static struct attribute_group inputs_attr_group = {
659 .attrs = inputs_attrs,
662 int mv_otg_remove(struct platform_device *pdev)
664 struct mv_otg *mvotg = platform_get_drvdata(pdev);
667 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
670 free_irq(mvotg->irq, mvotg);
672 if (mvotg->pdata->vbus)
673 free_irq(mvotg->pdata->vbus->irq, mvotg);
674 if (mvotg->pdata->id)
675 free_irq(mvotg->pdata->id->irq, mvotg);
678 flush_workqueue(mvotg->qwork);
679 destroy_workqueue(mvotg->qwork);
682 mv_otg_disable(mvotg);
685 iounmap(mvotg->cap_regs);
688 iounmap(mvotg->phy_regs);
690 for (clk_i = 0; clk_i <= mvotg->clknum; clk_i++)
691 clk_put(mvotg->clk[clk_i]);
693 usb_remove_phy(&mvotg->phy);
694 platform_set_drvdata(pdev, NULL);
696 kfree(mvotg->phy.otg);
702 static int mv_otg_probe(struct platform_device *pdev)
704 struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
705 struct mv_otg *mvotg;
708 int retval = 0, clk_i, i;
712 dev_err(&pdev->dev, "failed to get platform data\n");
716 size = sizeof(*mvotg) + sizeof(struct clk *) * pdata->clknum;
717 mvotg = kzalloc(size, GFP_KERNEL);
719 dev_err(&pdev->dev, "failed to allocate memory!\n");
723 otg = kzalloc(sizeof *otg, GFP_KERNEL);
729 platform_set_drvdata(pdev, mvotg);
732 mvotg->pdata = pdata;
734 mvotg->clknum = pdata->clknum;
735 for (clk_i = 0; clk_i < mvotg->clknum; clk_i++) {
736 mvotg->clk[clk_i] = clk_get(&pdev->dev, pdata->clkname[clk_i]);
737 if (IS_ERR(mvotg->clk[clk_i])) {
738 retval = PTR_ERR(mvotg->clk[clk_i]);
743 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
745 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
750 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
752 /* OTG common part */
754 mvotg->phy.dev = &pdev->dev;
755 mvotg->phy.otg = otg;
756 mvotg->phy.label = driver_name;
757 mvotg->phy.state = OTG_STATE_UNDEFINED;
759 otg->phy = &mvotg->phy;
760 otg->set_host = mv_otg_set_host;
761 otg->set_peripheral = mv_otg_set_peripheral;
762 otg->set_vbus = mv_otg_set_vbus;
764 for (i = 0; i < OTG_TIMER_NUM; i++)
765 init_timer(&mvotg->otg_ctrl.timer[i]);
767 r = platform_get_resource_byname(mvotg->pdev,
768 IORESOURCE_MEM, "phyregs");
770 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
772 goto err_destroy_workqueue;
775 mvotg->phy_regs = ioremap(r->start, resource_size(r));
776 if (mvotg->phy_regs == NULL) {
777 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
779 goto err_destroy_workqueue;
782 r = platform_get_resource_byname(mvotg->pdev,
783 IORESOURCE_MEM, "capregs");
785 dev_err(&pdev->dev, "no I/O memory resource defined\n");
787 goto err_unmap_phyreg;
790 mvotg->cap_regs = ioremap(r->start, resource_size(r));
791 if (mvotg->cap_regs == NULL) {
792 dev_err(&pdev->dev, "failed to map I/O memory\n");
794 goto err_unmap_phyreg;
797 /* we will acces controller register, so enable the udc controller */
798 retval = mv_otg_enable_internal(mvotg);
800 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
801 goto err_unmap_capreg;
805 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
806 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
809 retval = request_threaded_irq(pdata->id->irq, NULL,
811 IRQF_ONESHOT, "id", mvotg);
814 "Failed to request irq for ID\n");
820 mvotg->clock_gating = 1;
821 retval = request_threaded_irq(pdata->vbus->irq, NULL,
823 IRQF_ONESHOT, "vbus", mvotg);
826 "Failed to request irq for VBUS, "
827 "disable clock gating\n");
828 mvotg->clock_gating = 0;
833 if (pdata->disable_otg_clock_gating)
834 mvotg->clock_gating = 0;
837 mv_otg_init_irq(mvotg);
839 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
841 dev_err(&pdev->dev, "no IRQ resource defined\n");
843 goto err_disable_clk;
846 mvotg->irq = r->start;
847 if (request_irq(mvotg->irq, mv_otg_irq, IRQF_SHARED,
848 driver_name, mvotg)) {
849 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
853 goto err_disable_clk;
856 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
858 dev_err(&pdev->dev, "can't register transceiver, %d\n",
863 retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
866 "Can't register sysfs attr group: %d\n", retval);
867 goto err_set_transceiver;
870 spin_lock_init(&mvotg->wq_lock);
871 if (spin_trylock(&mvotg->wq_lock)) {
872 mv_otg_run_state_machine(mvotg, 2 * HZ);
873 spin_unlock(&mvotg->wq_lock);
877 "successful probe OTG device %s clock gating.\n",
878 mvotg->clock_gating ? "with" : "without");
883 usb_remove_phy(&mvotg->phy);
885 free_irq(mvotg->irq, mvotg);
888 free_irq(pdata->vbus->irq, mvotg);
890 free_irq(pdata->id->irq, mvotg);
891 mv_otg_disable_internal(mvotg);
893 iounmap(mvotg->cap_regs);
895 iounmap(mvotg->phy_regs);
896 err_destroy_workqueue:
897 flush_workqueue(mvotg->qwork);
898 destroy_workqueue(mvotg->qwork);
900 for (clk_i--; clk_i >= 0; clk_i--)
901 clk_put(mvotg->clk[clk_i]);
903 platform_set_drvdata(pdev, NULL);
911 static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
913 struct mv_otg *mvotg = platform_get_drvdata(pdev);
915 if (mvotg->phy.state != OTG_STATE_B_IDLE) {
917 "OTG state is not B_IDLE, it is %d!\n",
922 if (!mvotg->clock_gating)
923 mv_otg_disable_internal(mvotg);
928 static int mv_otg_resume(struct platform_device *pdev)
930 struct mv_otg *mvotg = platform_get_drvdata(pdev);
933 if (!mvotg->clock_gating) {
934 mv_otg_enable_internal(mvotg);
936 otgsc = readl(&mvotg->op_regs->otgsc);
937 otgsc |= mvotg->irq_en;
938 writel(otgsc, &mvotg->op_regs->otgsc);
940 if (spin_trylock(&mvotg->wq_lock)) {
941 mv_otg_run_state_machine(mvotg, 0);
942 spin_unlock(&mvotg->wq_lock);
949 static struct platform_driver mv_otg_driver = {
950 .probe = mv_otg_probe,
951 .remove = __exit_p(mv_otg_remove),
953 .owner = THIS_MODULE,
957 .suspend = mv_otg_suspend,
958 .resume = mv_otg_resume,
961 module_platform_driver(mv_otg_driver);