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|
// SPDX-License-Identifier: GPL-2.0
/*
* Generic platform ehci driver
*
* Copyright 2007 Steven Brown <sbrown@cortland.com>
* Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
* Copyright 2014 Hans de Goede <hdegoede@redhat.com>
*
* Derived from the ohci-ssb driver
* Copyright 2007 Michael Buesch <m@bues.ch>
*
* Derived from the EHCI-PCI driver
* Copyright (c) 2000-2004 by David Brownell
*
* Derived from the ohci-pci driver
* Copyright 1999 Roman Weissgaerber
* Copyright 2000-2002 David Brownell
* Copyright 1999 Linus Torvalds
* Copyright 1999 Gregory P. Smith
*/
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/hrtimer.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/sys_soc.h>
#include <linux/timer.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/ehci_pdriver.h>
#include <linux/usb/of.h>
#include "ehci.h"
#define DRIVER_DESC "EHCI generic platform driver"
#define EHCI_MAX_CLKS 4
#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
#define BCM_USB_FIFO_THRESHOLD 0x00800040
#define bcm_iproc_insnreg01 hostpc[0]
struct ehci_platform_priv {
struct clk *clks[EHCI_MAX_CLKS];
struct reset_control *rsts;
bool reset_on_resume;
bool quirk_poll;
struct timer_list poll_timer;
struct delayed_work poll_work;
};
static const char hcd_name[] = "ehci-platform";
static int ehci_platform_reset(struct usb_hcd *hcd)
{
struct platform_device *pdev = to_platform_device(hcd->self.controller);
struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int retval;
ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
if (pdata->pre_setup) {
retval = pdata->pre_setup(hcd);
if (retval < 0)
return retval;
}
ehci->caps = hcd->regs + pdata->caps_offset;
retval = ehci_setup(hcd);
if (retval)
return retval;
if (pdata->no_io_watchdog)
ehci->need_io_watchdog = 0;
if (of_device_is_compatible(pdev->dev.of_node, "brcm,xgs-iproc-ehci"))
ehci_writel(ehci, BCM_USB_FIFO_THRESHOLD,
&ehci->regs->bcm_iproc_insnreg01);
return 0;
}
static int ehci_platform_power_on(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
int clk, ret;
for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
ret = clk_prepare_enable(priv->clks[clk]);
if (ret)
goto err_disable_clks;
}
return 0;
err_disable_clks:
while (--clk >= 0)
clk_disable_unprepare(priv->clks[clk]);
return ret;
}
static void ehci_platform_power_off(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
int clk;
for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
if (priv->clks[clk])
clk_disable_unprepare(priv->clks[clk]);
}
static struct hc_driver __read_mostly ehci_platform_hc_driver;
static const struct ehci_driver_overrides platform_overrides __initconst = {
.reset = ehci_platform_reset,
.extra_priv_size = sizeof(struct ehci_platform_priv),
};
static struct usb_ehci_pdata ehci_platform_defaults = {
.power_on = ehci_platform_power_on,
.power_suspend = ehci_platform_power_off,
.power_off = ehci_platform_power_off,
};
/**
* quirk_poll_check_port_status - Poll port_status if the device sticks
* @ehci: the ehci hcd pointer
*
* Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting
* stuck very rarely after a full/low usb device was disconnected. To
* detect such a situation, the controllers require a special way which poll
* the EHCI PORTSC register.
*
* Return: true if the controller's port_status indicated getting stuck
*/
static bool quirk_poll_check_port_status(struct ehci_hcd *ehci)
{
u32 port_status = ehci_readl(ehci, &ehci->regs->port_status[0]);
if (!(port_status & PORT_OWNER) &&
(port_status & PORT_POWER) &&
!(port_status & PORT_CONNECT) &&
(port_status & PORT_LS_MASK))
return true;
return false;
}
/**
* quirk_poll_rebind_companion - rebind comanion device to recover
* @ehci: the ehci hcd pointer
*
* Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting
* stuck very rarely after a full/low usb device was disconnected. To
* recover from such a situation, the controllers require changing the OHCI
* functional state.
*/
static void quirk_poll_rebind_companion(struct ehci_hcd *ehci)
{
struct device *companion_dev;
struct usb_hcd *hcd = ehci_to_hcd(ehci);
companion_dev = usb_of_get_companion_dev(hcd->self.controller);
if (!companion_dev)
return;
device_release_driver(companion_dev);
if (device_attach(companion_dev) < 0)
ehci_err(ehci, "%s: failed\n", __func__);
put_device(companion_dev);
}
static void quirk_poll_work(struct work_struct *work)
{
struct ehci_platform_priv *priv =
container_of(to_delayed_work(work), struct ehci_platform_priv,
poll_work);
struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd,
priv);
/* check the status twice to reduce misdetection rate */
if (!quirk_poll_check_port_status(ehci))
return;
udelay(10);
if (!quirk_poll_check_port_status(ehci))
return;
ehci_dbg(ehci, "%s: detected getting stuck. rebind now!\n", __func__);
quirk_poll_rebind_companion(ehci);
}
static void quirk_poll_timer(struct timer_list *t)
{
struct ehci_platform_priv *priv = from_timer(priv, t, poll_timer);
struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd,
priv);
if (quirk_poll_check_port_status(ehci)) {
/*
* Now scheduling the work for testing the port more. Note that
* updating the status is possible to be delayed when
* reconnection. So, this uses delayed work with 5 ms delay
* to avoid misdetection.
*/
schedule_delayed_work(&priv->poll_work, msecs_to_jiffies(5));
}
mod_timer(&priv->poll_timer, jiffies + HZ);
}
static void quirk_poll_init(struct ehci_platform_priv *priv)
{
INIT_DELAYED_WORK(&priv->poll_work, quirk_poll_work);
timer_setup(&priv->poll_timer, quirk_poll_timer, 0);
mod_timer(&priv->poll_timer, jiffies + HZ);
}
static void quirk_poll_end(struct ehci_platform_priv *priv)
{
del_timer_sync(&priv->poll_timer);
cancel_delayed_work(&priv->poll_work);
}
static const struct soc_device_attribute quirk_poll_match[] = {
{ .family = "R-Car Gen3" },
{ /* sentinel*/ }
};
static int ehci_platform_probe(struct platform_device *dev)
{
struct usb_hcd *hcd;
struct resource *res_mem;
struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
struct ehci_platform_priv *priv;
struct ehci_hcd *ehci;
int err, irq, clk = 0;
if (usb_disabled())
return -ENODEV;
/*
* Use reasonable defaults so platforms don't have to provide these
* with DT probing on ARM.
*/
if (!pdata)
pdata = &ehci_platform_defaults;
err = dma_coerce_mask_and_coherent(&dev->dev,
pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(
|