![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Jonathan Hunter <jonathanh@nvidia.com> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
897 lines
21 KiB
C
897 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2011 Marvell International Ltd. All rights reserved.
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* Author: Chao Xie <chao.xie@marvell.com>
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* Neil Zhang <zhangwm@marvell.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/device.h>
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#include <linux/proc_fs.h>
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#include <linux/clk.h>
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#include <linux/workqueue.h>
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#include <linux/platform_device.h>
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#include <linux/usb.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/hcd.h>
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#include <linux/platform_data/mv_usb.h>
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#include "phy-mv-usb.h"
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#define DRIVER_DESC "Marvell USB OTG transceiver driver"
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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static const char driver_name[] = "mv-otg";
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static char *state_string[] = {
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"undefined",
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"b_idle",
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"b_srp_init",
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"b_peripheral",
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"b_wait_acon",
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"b_host",
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"a_idle",
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"a_wait_vrise",
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"a_wait_bcon",
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"a_host",
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"a_suspend",
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"a_peripheral",
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"a_wait_vfall",
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"a_vbus_err"
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};
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static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
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{
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struct mv_otg *mvotg = container_of(otg->usb_phy, struct mv_otg, phy);
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if (mvotg->pdata->set_vbus == NULL)
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return -ENODEV;
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return mvotg->pdata->set_vbus(on);
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}
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static int mv_otg_set_host(struct usb_otg *otg,
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struct usb_bus *host)
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{
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otg->host = host;
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return 0;
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}
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static int mv_otg_set_peripheral(struct usb_otg *otg,
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struct usb_gadget *gadget)
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{
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otg->gadget = gadget;
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return 0;
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}
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static void mv_otg_run_state_machine(struct mv_otg *mvotg,
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unsigned long delay)
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{
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dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
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if (!mvotg->qwork)
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return;
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queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
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}
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static void mv_otg_timer_await_bcon(struct timer_list *t)
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{
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struct mv_otg *mvotg = from_timer(mvotg, t,
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otg_ctrl.timer[A_WAIT_BCON_TIMER]);
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mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
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dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
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if (spin_trylock(&mvotg->wq_lock)) {
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mv_otg_run_state_machine(mvotg, 0);
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spin_unlock(&mvotg->wq_lock);
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}
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}
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static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
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{
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struct timer_list *timer;
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if (id >= OTG_TIMER_NUM)
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return -EINVAL;
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timer = &mvotg->otg_ctrl.timer[id];
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if (timer_pending(timer))
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del_timer(timer);
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return 0;
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}
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static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
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unsigned long interval)
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{
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struct timer_list *timer;
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if (id >= OTG_TIMER_NUM)
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return -EINVAL;
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timer = &mvotg->otg_ctrl.timer[id];
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if (timer_pending(timer)) {
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dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id);
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return -EBUSY;
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}
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timer->expires = jiffies + interval;
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add_timer(timer);
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return 0;
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}
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static int mv_otg_reset(struct mv_otg *mvotg)
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{
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unsigned int loops;
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u32 tmp;
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/* Stop the controller */
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tmp = readl(&mvotg->op_regs->usbcmd);
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tmp &= ~USBCMD_RUN_STOP;
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writel(tmp, &mvotg->op_regs->usbcmd);
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/* Reset the controller to get default values */
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writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
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loops = 500;
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while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
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if (loops == 0) {
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dev_err(&mvotg->pdev->dev,
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"Wait for RESET completed TIMEOUT\n");
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return -ETIMEDOUT;
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}
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loops--;
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udelay(20);
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}
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writel(0x0, &mvotg->op_regs->usbintr);
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tmp = readl(&mvotg->op_regs->usbsts);
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writel(tmp, &mvotg->op_regs->usbsts);
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return 0;
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}
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static void mv_otg_init_irq(struct mv_otg *mvotg)
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{
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u32 otgsc;
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mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID
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| OTGSC_INTR_A_VBUS_VALID;
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mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID
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| OTGSC_INTSTS_A_VBUS_VALID;
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if (mvotg->pdata->vbus == NULL) {
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mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID
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| OTGSC_INTR_B_SESSION_END;
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mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID
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| OTGSC_INTSTS_B_SESSION_END;
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}
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if (mvotg->pdata->id == NULL) {
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mvotg->irq_en |= OTGSC_INTR_USB_ID;
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mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
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}
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otgsc = readl(&mvotg->op_regs->otgsc);
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otgsc |= mvotg->irq_en;
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writel(otgsc, &mvotg->op_regs->otgsc);
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}
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static void mv_otg_start_host(struct mv_otg *mvotg, int on)
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{
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#ifdef CONFIG_USB
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struct usb_otg *otg = mvotg->phy.otg;
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struct usb_hcd *hcd;
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if (!otg->host)
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return;
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dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
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hcd = bus_to_hcd(otg->host);
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if (on) {
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usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
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device_wakeup_enable(hcd->self.controller);
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} else {
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usb_remove_hcd(hcd);
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}
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#endif /* CONFIG_USB */
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}
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static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
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{
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struct usb_otg *otg = mvotg->phy.otg;
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if (!otg->gadget)
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return;
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dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
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if (on)
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usb_gadget_vbus_connect(otg->gadget);
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else
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usb_gadget_vbus_disconnect(otg->gadget);
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}
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static void otg_clock_enable(struct mv_otg *mvotg)
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{
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clk_prepare_enable(mvotg->clk);
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}
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static void otg_clock_disable(struct mv_otg *mvotg)
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{
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clk_disable_unprepare(mvotg->clk);
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}
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static int mv_otg_enable_internal(struct mv_otg *mvotg)
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{
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int retval = 0;
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if (mvotg->active)
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return 0;
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dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
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otg_clock_enable(mvotg);
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if (mvotg->pdata->phy_init) {
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retval = mvotg->pdata->phy_init(mvotg->phy_regs);
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if (retval) {
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dev_err(&mvotg->pdev->dev,
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"init phy error %d\n", retval);
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otg_clock_disable(mvotg);
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return retval;
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}
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}
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mvotg->active = 1;
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return 0;
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}
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static int mv_otg_enable(struct mv_otg *mvotg)
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{
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if (mvotg->clock_gating)
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return mv_otg_enable_internal(mvotg);
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return 0;
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}
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static void mv_otg_disable_internal(struct mv_otg *mvotg)
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{
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if (mvotg->active) {
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dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
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if (mvotg->pdata->phy_deinit)
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mvotg->pdata->phy_deinit(mvotg->phy_regs);
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otg_clock_disable(mvotg);
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mvotg->active = 0;
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}
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}
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static void mv_otg_disable(struct mv_otg *mvotg)
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{
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if (mvotg->clock_gating)
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mv_otg_disable_internal(mvotg);
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}
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static void mv_otg_update_inputs(struct mv_otg *mvotg)
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{
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struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
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u32 otgsc;
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otgsc = readl(&mvotg->op_regs->otgsc);
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if (mvotg->pdata->vbus) {
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if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
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otg_ctrl->b_sess_vld = 1;
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otg_ctrl->b_sess_end = 0;
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} else {
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otg_ctrl->b_sess_vld = 0;
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otg_ctrl->b_sess_end = 1;
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}
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} else {
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otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
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otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
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}
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if (mvotg->pdata->id)
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otg_ctrl->id = !!mvotg->pdata->id->poll();
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else
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otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
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if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
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otg_ctrl->a_bus_req = 1;
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otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
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otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
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dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
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dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
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dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
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dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
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dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
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dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
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}
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static void mv_otg_update_state(struct mv_otg *mvotg)
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{
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struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
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int old_state = mvotg->phy.otg->state;
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switch (old_state) {
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case OTG_STATE_UNDEFINED:
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mvotg->phy.otg->state = OTG_STATE_B_IDLE;
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/* FALL THROUGH */
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case OTG_STATE_B_IDLE:
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if (otg_ctrl->id == 0)
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mvotg->phy.otg->state = OTG_STATE_A_IDLE;
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else if (otg_ctrl->b_sess_vld)
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mvotg->phy.otg->state = OTG_STATE_B_PERIPHERAL;
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break;
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case OTG_STATE_B_PERIPHERAL:
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if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
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mvotg->phy.otg->state = OTG_STATE_B_IDLE;
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break;
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case OTG_STATE_A_IDLE:
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if (otg_ctrl->id)
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mvotg->phy.otg->state = OTG_STATE_B_IDLE;
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else if (!(otg_ctrl->a_bus_drop) &&
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(otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
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break;
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case OTG_STATE_A_WAIT_VRISE:
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if (otg_ctrl->a_vbus_vld)
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
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break;
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case OTG_STATE_A_WAIT_BCON:
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if (otg_ctrl->id || otg_ctrl->a_bus_drop
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|| otg_ctrl->a_wait_bcon_timeout) {
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mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
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mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
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otg_ctrl->a_bus_req = 0;
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} else if (!otg_ctrl->a_vbus_vld) {
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mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
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mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
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mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
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} else if (otg_ctrl->b_conn) {
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mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
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mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
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mvotg->phy.otg->state = OTG_STATE_A_HOST;
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}
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break;
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case OTG_STATE_A_HOST:
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if (otg_ctrl->id || !otg_ctrl->b_conn
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|| otg_ctrl->a_bus_drop)
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
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else if (!otg_ctrl->a_vbus_vld)
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mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
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break;
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case OTG_STATE_A_WAIT_VFALL:
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if (otg_ctrl->id
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|| (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
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|| otg_ctrl->a_bus_req)
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mvotg->phy.otg->state = OTG_STATE_A_IDLE;
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break;
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case OTG_STATE_A_VBUS_ERR:
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if (otg_ctrl->id || otg_ctrl->a_clr_err
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|| otg_ctrl->a_bus_drop) {
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otg_ctrl->a_clr_err = 0;
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
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}
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break;
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default:
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break;
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}
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}
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static void mv_otg_work(struct work_struct *work)
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{
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struct mv_otg *mvotg;
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struct usb_phy *phy;
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struct usb_otg *otg;
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int old_state;
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mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
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run:
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/* work queue is single thread, or we need spin_lock to protect */
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phy = &mvotg->phy;
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otg = mvotg->phy.otg;
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old_state = otg->state;
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if (!mvotg->active)
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return;
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mv_otg_update_inputs(mvotg);
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mv_otg_update_state(mvotg);
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if (old_state != mvotg->phy.otg->state) {
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dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
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state_string[old_state],
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state_string[mvotg->phy.otg->state]);
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switch (mvotg->phy.otg->state) {
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case OTG_STATE_B_IDLE:
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otg->default_a = 0;
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if (old_state == OTG_STATE_B_PERIPHERAL)
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mv_otg_start_periphrals(mvotg, 0);
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mv_otg_reset(mvotg);
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mv_otg_disable(mvotg);
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usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE);
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break;
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case OTG_STATE_B_PERIPHERAL:
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mv_otg_enable(mvotg);
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mv_otg_start_periphrals(mvotg, 1);
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usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED);
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break;
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case OTG_STATE_A_IDLE:
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otg->default_a = 1;
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mv_otg_enable(mvotg);
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if (old_state == OTG_STATE_A_WAIT_VFALL)
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mv_otg_start_host(mvotg, 0);
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mv_otg_reset(mvotg);
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break;
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case OTG_STATE_A_WAIT_VRISE:
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mv_otg_set_vbus(otg, 1);
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break;
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case OTG_STATE_A_WAIT_BCON:
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if (old_state != OTG_STATE_A_HOST)
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mv_otg_start_host(mvotg, 1);
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mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
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T_A_WAIT_BCON);
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/*
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* Now, we directly enter A_HOST. So set b_conn = 1
|
|
* here. In fact, it need host driver to notify us.
|
|
*/
|
|
mvotg->otg_ctrl.b_conn = 1;
|
|
break;
|
|
case OTG_STATE_A_HOST:
|
|
break;
|
|
case OTG_STATE_A_WAIT_VFALL:
|
|
/*
|
|
* Now, we has exited A_HOST. So set b_conn = 0
|
|
* here. In fact, it need host driver to notify us.
|
|
*/
|
|
mvotg->otg_ctrl.b_conn = 0;
|
|
mv_otg_set_vbus(otg, 0);
|
|
break;
|
|
case OTG_STATE_A_VBUS_ERR:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
goto run;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t mv_otg_irq(int irq, void *dev)
|
|
{
|
|
struct mv_otg *mvotg = dev;
|
|
u32 otgsc;
|
|
|
|
otgsc = readl(&mvotg->op_regs->otgsc);
|
|
writel(otgsc, &mvotg->op_regs->otgsc);
|
|
|
|
/*
|
|
* if we have vbus, then the vbus detection for B-device
|
|
* will be done by mv_otg_inputs_irq().
|
|
*/
|
|
if (mvotg->pdata->vbus)
|
|
if ((otgsc & OTGSC_STS_USB_ID) &&
|
|
!(otgsc & OTGSC_INTSTS_USB_ID))
|
|
return IRQ_NONE;
|
|
|
|
if ((otgsc & mvotg->irq_status) == 0)
|
|
return IRQ_NONE;
|
|
|
|
mv_otg_run_state_machine(mvotg, 0);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
|
|
{
|
|
struct mv_otg *mvotg = dev;
|
|
|
|
/* The clock may disabled at this time */
|
|
if (!mvotg->active) {
|
|
mv_otg_enable(mvotg);
|
|
mv_otg_init_irq(mvotg);
|
|
}
|
|
|
|
mv_otg_run_state_machine(mvotg, 0);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static ssize_t
|
|
get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct mv_otg *mvotg = dev_get_drvdata(dev);
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n",
|
|
mvotg->otg_ctrl.a_bus_req);
|
|
}
|
|
|
|
static ssize_t
|
|
set_a_bus_req(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct mv_otg *mvotg = dev_get_drvdata(dev);
|
|
|
|
if (count > 2)
|
|
return -1;
|
|
|
|
/* We will use this interface to change to A device */
|
|
if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
|
|
&& mvotg->phy.otg->state != OTG_STATE_A_IDLE)
|
|
return -1;
|
|
|
|
/* The clock may disabled and we need to set irq for ID detected */
|
|
mv_otg_enable(mvotg);
|
|
mv_otg_init_irq(mvotg);
|
|
|
|
if (buf[0] == '1') {
|
|
mvotg->otg_ctrl.a_bus_req = 1;
|
|
mvotg->otg_ctrl.a_bus_drop = 0;
|
|
dev_dbg(&mvotg->pdev->dev,
|
|
"User request: a_bus_req = 1\n");
|
|
|
|
if (spin_trylock(&mvotg->wq_lock)) {
|
|
mv_otg_run_state_machine(mvotg, 0);
|
|
spin_unlock(&mvotg->wq_lock);
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
|
|
set_a_bus_req);
|
|
|
|
static ssize_t
|
|
set_a_clr_err(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct mv_otg *mvotg = dev_get_drvdata(dev);
|
|
if (!mvotg->phy.otg->default_a)
|
|
return -1;
|
|
|
|
if (count > 2)
|
|
return -1;
|
|
|
|
if (buf[0] == '1') {
|
|
mvotg->otg_ctrl.a_clr_err = 1;
|
|
dev_dbg(&mvotg->pdev->dev,
|
|
"User request: a_clr_err = 1\n");
|
|
}
|
|
|
|
if (spin_trylock(&mvotg->wq_lock)) {
|
|
mv_otg_run_state_machine(mvotg, 0);
|
|
spin_unlock(&mvotg->wq_lock);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
|
|
|
|
static ssize_t
|
|
get_a_bus_drop(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct mv_otg *mvotg = dev_get_drvdata(dev);
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n",
|
|
mvotg->otg_ctrl.a_bus_drop);
|
|
}
|
|
|
|
static ssize_t
|
|
set_a_bus_drop(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct mv_otg *mvotg = dev_get_drvdata(dev);
|
|
if (!mvotg->phy.otg->default_a)
|
|
return -1;
|
|
|
|
if (count > 2)
|
|
return -1;
|
|
|
|
if (buf[0] == '0') {
|
|
mvotg->otg_ctrl.a_bus_drop = 0;
|
|
dev_dbg(&mvotg->pdev->dev,
|
|
"User request: a_bus_drop = 0\n");
|
|
} else if (buf[0] == '1') {
|
|
mvotg->otg_ctrl.a_bus_drop = 1;
|
|
mvotg->otg_ctrl.a_bus_req = 0;
|
|
dev_dbg(&mvotg->pdev->dev,
|
|
"User request: a_bus_drop = 1\n");
|
|
dev_dbg(&mvotg->pdev->dev,
|
|
"User request: and a_bus_req = 0\n");
|
|
}
|
|
|
|
if (spin_trylock(&mvotg->wq_lock)) {
|
|
mv_otg_run_state_machine(mvotg, 0);
|
|
spin_unlock(&mvotg->wq_lock);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
|
|
get_a_bus_drop, set_a_bus_drop);
|
|
|
|
static struct attribute *inputs_attrs[] = {
|
|
&dev_attr_a_bus_req.attr,
|
|
&dev_attr_a_clr_err.attr,
|
|
&dev_attr_a_bus_drop.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group inputs_attr_group = {
|
|
.name = "inputs",
|
|
.attrs = inputs_attrs,
|
|
};
|
|
|
|
static int mv_otg_remove(struct platform_device *pdev)
|
|
{
|
|
struct mv_otg *mvotg = platform_get_drvdata(pdev);
|
|
|
|
sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
|
|
|
|
if (mvotg->qwork) {
|
|
flush_workqueue(mvotg->qwork);
|
|
destroy_workqueue(mvotg->qwork);
|
|
}
|
|
|
|
mv_otg_disable(mvotg);
|
|
|
|
usb_remove_phy(&mvotg->phy);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mv_otg_probe(struct platform_device *pdev)
|
|
{
|
|
struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct mv_otg *mvotg;
|
|
struct usb_otg *otg;
|
|
struct resource *r;
|
|
int retval = 0, i;
|
|
|
|
if (pdata == NULL) {
|
|
dev_err(&pdev->dev, "failed to get platform data\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
|
|
if (!mvotg)
|
|
return -ENOMEM;
|
|
|
|
otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
|
|
if (!otg)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, mvotg);
|
|
|
|
mvotg->pdev = pdev;
|
|
mvotg->pdata = pdata;
|
|
|
|
mvotg->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(mvotg->clk))
|
|
return PTR_ERR(mvotg->clk);
|
|
|
|
mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
|
|
if (!mvotg->qwork) {
|
|
dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
|
|
|
|
/* OTG common part */
|
|
mvotg->pdev = pdev;
|
|
mvotg->phy.dev = &pdev->dev;
|
|
mvotg->phy.otg = otg;
|
|
mvotg->phy.label = driver_name;
|
|
|
|
otg->state = OTG_STATE_UNDEFINED;
|
|
otg->usb_phy = &mvotg->phy;
|
|
otg->set_host = mv_otg_set_host;
|
|
otg->set_peripheral = mv_otg_set_peripheral;
|
|
otg->set_vbus = mv_otg_set_vbus;
|
|
|
|
for (i = 0; i < OTG_TIMER_NUM; i++)
|
|
timer_setup(&mvotg->otg_ctrl.timer[i],
|
|
mv_otg_timer_await_bcon, 0);
|
|
|
|
r = platform_get_resource_byname(mvotg->pdev,
|
|
IORESOURCE_MEM, "phyregs");
|
|
if (r == NULL) {
|
|
dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
|
|
retval = -ENODEV;
|
|
goto err_destroy_workqueue;
|
|
}
|
|
|
|
mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
|
|
if (mvotg->phy_regs == NULL) {
|
|
dev_err(&pdev->dev, "failed to map phy I/O memory\n");
|
|
retval = -EFAULT;
|
|
goto err_destroy_workqueue;
|
|
}
|
|
|
|
r = platform_get_resource_byname(mvotg->pdev,
|
|
IORESOURCE_MEM, "capregs");
|
|
if (r == NULL) {
|
|
dev_err(&pdev->dev, "no I/O memory resource defined\n");
|
|
retval = -ENODEV;
|
|
goto err_destroy_workqueue;
|
|
}
|
|
|
|
mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
|
|
if (mvotg->cap_regs == NULL) {
|
|
dev_err(&pdev->dev, "failed to map I/O memory\n");
|
|
retval = -EFAULT;
|
|
goto err_destroy_workqueue;
|
|
}
|
|
|
|
/* we will acces controller register, so enable the udc controller */
|
|
retval = mv_otg_enable_internal(mvotg);
|
|
if (retval) {
|
|
dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
|
|
goto err_destroy_workqueue;
|
|
}
|
|
|
|
mvotg->op_regs =
|
|
(struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
|
|
+ (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
|
|
|
|
if (pdata->id) {
|
|
retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
|
|
NULL, mv_otg_inputs_irq,
|
|
IRQF_ONESHOT, "id", mvotg);
|
|
if (retval) {
|
|
dev_info(&pdev->dev,
|
|
"Failed to request irq for ID\n");
|
|
pdata->id = NULL;
|
|
}
|
|
}
|
|
|
|
if (pdata->vbus) {
|
|
mvotg->clock_gating = 1;
|
|
retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
|
|
NULL, mv_otg_inputs_irq,
|
|
IRQF_ONESHOT, "vbus", mvotg);
|
|
if (retval) {
|
|
dev_info(&pdev->dev,
|
|
"Failed to request irq for VBUS, "
|
|
"disable clock gating\n");
|
|
mvotg->clock_gating = 0;
|
|
pdata->vbus = NULL;
|
|
}
|
|
}
|
|
|
|
if (pdata->disable_otg_clock_gating)
|
|
mvotg->clock_gating = 0;
|
|
|
|
mv_otg_reset(mvotg);
|
|
mv_otg_init_irq(mvotg);
|
|
|
|
r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
|
|
if (r == NULL) {
|
|
dev_err(&pdev->dev, "no IRQ resource defined\n");
|
|
retval = -ENODEV;
|
|
goto err_disable_clk;
|
|
}
|
|
|
|
mvotg->irq = r->start;
|
|
if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
|
|
driver_name, mvotg)) {
|
|
dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
|
|
mvotg->irq);
|
|
mvotg->irq = 0;
|
|
retval = -ENODEV;
|
|
goto err_disable_clk;
|
|
}
|
|
|
|
retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
|
|
if (retval < 0) {
|
|
dev_err(&pdev->dev, "can't register transceiver, %d\n",
|
|
retval);
|
|
goto err_disable_clk;
|
|
}
|
|
|
|
retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
|
|
if (retval < 0) {
|
|
dev_dbg(&pdev->dev,
|
|
"Can't register sysfs attr group: %d\n", retval);
|
|
goto err_remove_phy;
|
|
}
|
|
|
|
spin_lock_init(&mvotg->wq_lock);
|
|
if (spin_trylock(&mvotg->wq_lock)) {
|
|
mv_otg_run_state_machine(mvotg, 2 * HZ);
|
|
spin_unlock(&mvotg->wq_lock);
|
|
}
|
|
|
|
dev_info(&pdev->dev,
|
|
"successful probe OTG device %s clock gating.\n",
|
|
mvotg->clock_gating ? "with" : "without");
|
|
|
|
return 0;
|
|
|
|
err_remove_phy:
|
|
usb_remove_phy(&mvotg->phy);
|
|
err_disable_clk:
|
|
mv_otg_disable_internal(mvotg);
|
|
err_destroy_workqueue:
|
|
flush_workqueue(mvotg->qwork);
|
|
destroy_workqueue(mvotg->qwork);
|
|
|
|
return retval;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct mv_otg *mvotg = platform_get_drvdata(pdev);
|
|
|
|
if (mvotg->phy.otg->state != OTG_STATE_B_IDLE) {
|
|
dev_info(&pdev->dev,
|
|
"OTG state is not B_IDLE, it is %d!\n",
|
|
mvotg->phy.otg->state);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
if (!mvotg->clock_gating)
|
|
mv_otg_disable_internal(mvotg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mv_otg_resume(struct platform_device *pdev)
|
|
{
|
|
struct mv_otg *mvotg = platform_get_drvdata(pdev);
|
|
u32 otgsc;
|
|
|
|
if (!mvotg->clock_gating) {
|
|
mv_otg_enable_internal(mvotg);
|
|
|
|
otgsc = readl(&mvotg->op_regs->otgsc);
|
|
otgsc |= mvotg->irq_en;
|
|
writel(otgsc, &mvotg->op_regs->otgsc);
|
|
|
|
if (spin_trylock(&mvotg->wq_lock)) {
|
|
mv_otg_run_state_machine(mvotg, 0);
|
|
spin_unlock(&mvotg->wq_lock);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static struct platform_driver mv_otg_driver = {
|
|
.probe = mv_otg_probe,
|
|
.remove = mv_otg_remove,
|
|
.driver = {
|
|
.name = driver_name,
|
|
},
|
|
#ifdef CONFIG_PM
|
|
.suspend = mv_otg_suspend,
|
|
.resume = mv_otg_resume,
|
|
#endif
|
|
};
|
|
module_platform_driver(mv_otg_driver);
|