linux/drivers/usb/host/ohci-at91.c
Linus Torvalds 1a46712aa9 This is the bulk of GPIO changes for kernel v4.6:
Core changes:
 
 - The gpio_chip is now a *real device*. Until now the gpio chips
   were just piggybacking the parent device or (gasp) floating in
   space outside of the device model. We now finally make GPIO chips
   devices. The gpio_chip will create a gpio_device which contains
   a struct device, and this gpio_device struct is kept private.
   Anything that needs to be kept private from the rest of the kernel
   will gradually be moved over to the gpio_device.
 
 - As a result of making the gpio_device a real device, we have added
   resource management, so devm_gpiochip_add_data() will cut down on
   overhead and reduce code lines. A huge slew of patches convert
   almost all drivers in the subsystem to use this.
 
 - Building on making the GPIO a real device, we add the first step
   of a new userspace ABI: the GPIO character device. We take small
   steps here, so we first add a pure *information* ABI and the tool
   "lsgpio" that will list all GPIO devices on the system and all
   lines on these devices. We can now discover GPIOs properly from
   userspace. We still have not come up with a way to actually *use*
   GPIOs from userspace.
 
 - To encourage people to use the character device for the future,
   we have it always-enabled when using GPIO. The old sysfs ABI is
   still opt-in (and can be used in parallel), but is marked as
   deprecated. We will keep it around for the foreseeable future,
   but it will not be extended to cover ever more use cases.
 
 Cleanup:
 
 - Bjorn Helgaas removed a whole slew of per-architecture <asm/gpio.h>
   includes. This dates back to when GPIO was an opt-in feature and
   no shared library even existed: just a header file with proper
   prototypes was provided and all semantics were up to the arch to
   implement. These patches make the GPIO chip even more a proper
   device and cleans out leftovers of the old in-kernel API here
   and there. Still some cruft is left but it's very little now.
 
 - There is still some clamping of return values for .get() going
   on, but we now return sane values in the vast majority of drivers
   and the errorpath is sanitized. Some patches for powerpc, blackfin
   and unicore still drop in.
 
 - We continue to switch the ARM, MIPS, blackfin, m68k local GPIO
   implementations to use gpiochip_add_data() and cut down on code
   lines.
 
 - MPC8xxx is converted to use the generic GPIO helpers.
 
 - ATH79 is converted to use the generic GPIO helpers.
 
 New drivers:
 
 - WinSystems WS16C48
 
 - Acces 104-DIO-48E
 
 - F81866 (a F7188x variant)
 
 - Qoric (a MPC8xxx variant)
 
 - TS-4800
 
 - SPI serializers (pisosr): simple 74xx shift registers connected
   to SPI to obtain a dirt-cheap output-only GPIO expander.
 
 - Texas Instruments TPIC2810
 
 - Texas Instruments TPS65218
 
 - Texas Instruments TPS65912
 
 - X-Gene (ARM64) standby GPIO controller
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Merge tag 'gpio-v4.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This is the bulk of GPIO changes for kernel v4.6.  There is quite a
  lot of interesting stuff going on.

  The patches to other subsystems and arch-wide are ACKed as far as
  possible, though I consider things like per-arch <asm/gpio.h> as
  essentially a part of the GPIO subsystem so it should not be needed.

  Core changes:

   - The gpio_chip is now a *real device*.  Until now the gpio chips
     were just piggybacking the parent device or (gasp) floating in
     space outside of the device model.

     We now finally make GPIO chips devices.  The gpio_chip will create
     a gpio_device which contains a struct device, and this gpio_device
     struct is kept private.  Anything that needs to be kept private
     from the rest of the kernel will gradually be moved over to the
     gpio_device.

   - As a result of making the gpio_device a real device, we have added
     resource management, so devm_gpiochip_add_data() will cut down on
     overhead and reduce code lines.  A huge slew of patches convert
     almost all drivers in the subsystem to use this.

   - Building on making the GPIO a real device, we add the first step of
     a new userspace ABI: the GPIO character device.  We take small
     steps here, so we first add a pure *information* ABI and the tool
     "lsgpio" that will list all GPIO devices on the system and all
     lines on these devices.

     We can now discover GPIOs properly from userspace.  We still have
     not come up with a way to actually *use* GPIOs from userspace.

   - To encourage people to use the character device for the future, we
     have it always-enabled when using GPIO.  The old sysfs ABI is still
     opt-in (and can be used in parallel), but is marked as deprecated.

     We will keep it around for the foreseeable future, but it will not
     be extended to cover ever more use cases.

  Cleanup:

   - Bjorn Helgaas removed a whole slew of per-architecture <asm/gpio.h>
     includes.

     This dates back to when GPIO was an opt-in feature and no shared
     library even existed: just a header file with proper prototypes was
     provided and all semantics were up to the arch to implement.  These
     patches make the GPIO chip even more a proper device and cleans out
     leftovers of the old in-kernel API here and there.

     Still some cruft is left but it's very little now.

   - There is still some clamping of return values for .get() going on,
     but we now return sane values in the vast majority of drivers and
     the errorpath is sanitized.  Some patches for powerpc, blackfin and
     unicore still drop in.

   - We continue to switch the ARM, MIPS, blackfin, m68k local GPIO
     implementations to use gpiochip_add_data() and cut down on code
     lines.

   - MPC8xxx is converted to use the generic GPIO helpers.

   - ATH79 is converted to use the generic GPIO helpers.

  New drivers:

   - WinSystems WS16C48

   - Acces 104-DIO-48E

   - F81866 (a F7188x variant)

   - Qoric (a MPC8xxx variant)

   - TS-4800

   - SPI serializers (pisosr): simple 74xx shift registers connected to
     SPI to obtain a dirt-cheap output-only GPIO expander.

   - Texas Instruments TPIC2810

   - Texas Instruments TPS65218

   - Texas Instruments TPS65912

   - X-Gene (ARM64) standby GPIO controller"

* tag 'gpio-v4.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (194 commits)
  Revert "Share upstreaming patches"
  gpio: mcp23s08: Fix clearing of interrupt.
  gpiolib: Fix comment referring to gpio_*() in gpiod_*()
  gpio: pca953x: Fix pca953x_gpio_set_multiple() on 64-bit
  gpio: xgene: Fix kconfig for standby GIPO contoller
  gpio: Add generic serializer DT binding
  gpio: uapi: use 0xB4 as ioctl() major
  gpio: tps65912: fix bad merge
  Revert "gpio: lp3943: Drop pin_used and lp3943_gpio_request/lp3943_gpio_free"
  gpio: omap: drop dev field from gpio_bank structure
  gpio: mpc8xxx: Slightly update the code for better readability
  gpio: mpc8xxx: Remove *read_reg and *write_reg from struct mpc8xxx_gpio_chip
  gpio: mpc8xxx: Fixup setting gpio direction output
  gpio: mcp23s08: Add support for mcp23s18
  dt-bindings: gpio: altera: Fix altr,interrupt-type property
  gpio: add driver for MEN 16Z127 GPIO controller
  gpio: lp3943: Drop pin_used and lp3943_gpio_request/lp3943_gpio_free
  gpio: timberdale: Switch to devm_ioremap_resource()
  gpio: ts4800: Add IMX51 dependency
  gpiolib: rewrite gpiodev_add_to_list
  ...
2016-03-17 21:05:32 -07:00

691 lines
17 KiB
C

/*
* OHCI HCD (Host Controller Driver) for USB.
*
* Copyright (C) 2004 SAN People (Pty) Ltd.
* Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
*
* AT91 Bus Glue
*
* Based on fragments of 2.4 driver by Rick Bronson.
* Based on ohci-omap.c
*
* This file is licenced under the GPL.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/platform_data/atmel.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ohci.h"
#define valid_port(index) ((index) >= 0 && (index) < AT91_MAX_USBH_PORTS)
#define at91_for_each_port(index) \
for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
/* interface, function and usb clocks; sometimes also an AHB clock */
#define hcd_to_ohci_at91_priv(h) \
((struct ohci_at91_priv *)hcd_to_ohci(h)->priv)
#define AT91_MAX_USBH_PORTS 3
struct at91_usbh_data {
int vbus_pin[AT91_MAX_USBH_PORTS]; /* port power-control pin */
int overcurrent_pin[AT91_MAX_USBH_PORTS];
u8 ports; /* number of ports on root hub */
u8 overcurrent_supported;
u8 vbus_pin_active_low[AT91_MAX_USBH_PORTS];
u8 overcurrent_status[AT91_MAX_USBH_PORTS];
u8 overcurrent_changed[AT91_MAX_USBH_PORTS];
};
struct ohci_at91_priv {
struct clk *iclk;
struct clk *fclk;
struct clk *hclk;
bool clocked;
bool wakeup; /* Saved wake-up state for resume */
};
/* interface and function clocks; sometimes also an AHB clock */
#define DRIVER_DESC "OHCI Atmel driver"
static const char hcd_name[] = "ohci-atmel";
static struct hc_driver __read_mostly ohci_at91_hc_driver;
static const struct ohci_driver_overrides ohci_at91_drv_overrides __initconst = {
.extra_priv_size = sizeof(struct ohci_at91_priv),
};
extern int usb_disabled(void);
/*-------------------------------------------------------------------------*/
static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
{
if (ohci_at91->clocked)
return;
clk_set_rate(ohci_at91->fclk, 48000000);
clk_prepare_enable(ohci_at91->hclk);
clk_prepare_enable(ohci_at91->iclk);
clk_prepare_enable(ohci_at91->fclk);
ohci_at91->clocked = true;
}
static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
{
if (!ohci_at91->clocked)
return;
clk_disable_unprepare(ohci_at91->fclk);
clk_disable_unprepare(ohci_at91->iclk);
clk_disable_unprepare(ohci_at91->hclk);
ohci_at91->clocked = false;
}
static void at91_start_hc(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_regs __iomem *regs = hcd->regs;
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
dev_dbg(&pdev->dev, "start\n");
/*
* Start the USB clocks.
*/
at91_start_clock(ohci_at91);
/*
* The USB host controller must remain in reset.
*/
writel(0, &regs->control);
}
static void at91_stop_hc(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_regs __iomem *regs = hcd->regs;
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
dev_dbg(&pdev->dev, "stop\n");
/*
* Put the USB host controller into reset.
*/
writel(0, &regs->control);
/*
* Stop the USB clocks.
*/
at91_stop_clock(ohci_at91);
}
/*-------------------------------------------------------------------------*/
static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */
/**
* usb_hcd_at91_probe - initialize AT91-based HCDs
* Context: !in_interrupt()
*
* Allocates basic resources for this USB host controller, and
* then invokes the start() method for the HCD associated with it
* through the hotplug entry's driver_data.
*/
static int usb_hcd_at91_probe(const struct hc_driver *driver,
struct platform_device *pdev)
{
struct at91_usbh_data *board;
struct ohci_hcd *ohci;
int retval;
struct usb_hcd *hcd;
struct ohci_at91_priv *ohci_at91;
struct device *dev = &pdev->dev;
struct resource *res;
int irq;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_dbg(dev, "hcd probe: missing irq resource\n");
return irq;
}
hcd = usb_create_hcd(driver, dev, "at91");
if (!hcd)
return -ENOMEM;
ohci_at91 = hcd_to_ohci_at91_priv(hcd);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hcd->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(hcd->regs)) {
retval = PTR_ERR(hcd->regs);
goto err;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
ohci_at91->iclk = devm_clk_get(dev, "ohci_clk");
if (IS_ERR(ohci_at91->iclk)) {
dev_err(dev, "failed to get ohci_clk\n");
retval = PTR_ERR(ohci_at91->iclk);
goto err;
}
ohci_at91->fclk = devm_clk_get(dev, "uhpck");
if (IS_ERR(ohci_at91->fclk)) {
dev_err(dev, "failed to get uhpck\n");
retval = PTR_ERR(ohci_at91->fclk);
goto err;
}
ohci_at91->hclk = devm_clk_get(dev, "hclk");
if (IS_ERR(ohci_at91->hclk)) {
dev_err(dev, "failed to get hclk\n");
retval = PTR_ERR(ohci_at91->hclk);
goto err;
}
board = hcd->self.controller->platform_data;
ohci = hcd_to_ohci(hcd);
ohci->num_ports = board->ports;
at91_start_hc(pdev);
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (retval == 0) {
device_wakeup_enable(hcd->self.controller);
return retval;
}
/* Error handling */
at91_stop_hc(pdev);
err:
usb_put_hcd(hcd);
return retval;
}
/* may be called with controller, bus, and devices active */
/**
* usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of usb_hcd_at91_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, "rmmod" or something similar.
*
*/
static void usb_hcd_at91_remove(struct usb_hcd *hcd,
struct platform_device *pdev)
{
usb_remove_hcd(hcd);
at91_stop_hc(pdev);
usb_put_hcd(hcd);
}
/*-------------------------------------------------------------------------*/
static void ohci_at91_usb_set_power(struct at91_usbh_data *pdata, int port, int enable)
{
if (!valid_port(port))
return;
if (!gpio_is_valid(pdata->vbus_pin[port]))
return;
gpio_set_value(pdata->vbus_pin[port],
pdata->vbus_pin_active_low[port] ^ enable);
}
static int ohci_at91_usb_get_power(struct at91_usbh_data *pdata, int port)
{
if (!valid_port(port))
return -EINVAL;
if (!gpio_is_valid(pdata->vbus_pin[port]))
return -EINVAL;
return gpio_get_value(pdata->vbus_pin[port]) ^
pdata->vbus_pin_active_low[port];
}
/*
* Update the status data from the hub with the over-current indicator change.
*/
static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct at91_usbh_data *pdata = hcd->self.controller->platform_data;
int length = ohci_hub_status_data(hcd, buf);
int port;
at91_for_each_port(port) {
if (pdata->overcurrent_changed[port]) {
if (!length)
length = 1;
buf[0] |= 1 << (port + 1);
}
}
return length;
}
/*
* Look at the control requests to the root hub and see if we need to override.
*/
static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
u16 wIndex, char *buf, u16 wLength)
{
struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
struct usb_hub_descriptor *desc;
int ret = -EINVAL;
u32 *data = (u32 *)buf;
dev_dbg(hcd->self.controller,
"ohci_at91_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
hcd, typeReq, wValue, wIndex, buf, wLength);
wIndex--;
switch (typeReq) {
case SetPortFeature:
if (wValue == USB_PORT_FEAT_POWER) {
dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
if (valid_port(wIndex)) {
ohci_at91_usb_set_power(pdata, wIndex, 1);
ret = 0;
}
goto out;
}
break;
case ClearPortFeature:
switch (wValue) {
case USB_PORT_FEAT_C_OVER_CURRENT:
dev_dbg(hcd->self.controller,
"ClearPortFeature: C_OVER_CURRENT\n");
if (valid_port(wIndex)) {
pdata->overcurrent_changed[wIndex] = 0;
pdata->overcurrent_status[wIndex] = 0;
}
goto out;
case USB_PORT_FEAT_OVER_CURRENT:
dev_dbg(hcd->self.controller,
"ClearPortFeature: OVER_CURRENT\n");
if (valid_port(wIndex))
pdata->overcurrent_status[wIndex] = 0;
goto out;
case USB_PORT_FEAT_POWER:
dev_dbg(hcd->self.controller,
"ClearPortFeature: POWER\n");
if (valid_port(wIndex)) {
ohci_at91_usb_set_power(pdata, wIndex, 0);
return 0;
}
}
break;
}
ret = ohci_hub_control(hcd, typeReq, wValue, wIndex + 1, buf, wLength);
if (ret)
goto out;
switch (typeReq) {
case GetHubDescriptor:
/* update the hub's descriptor */
desc = (struct usb_hub_descriptor *)buf;
dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
desc->wHubCharacteristics);
/* remove the old configurations for power-switching, and
* over-current protection, and insert our new configuration
*/
desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
desc->wHubCharacteristics |=
cpu_to_le16(HUB_CHAR_INDV_PORT_LPSM);
if (pdata->overcurrent_supported) {
desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
desc->wHubCharacteristics |=
cpu_to_le16(HUB_CHAR_INDV_PORT_OCPM);
}
dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
desc->wHubCharacteristics);
return ret;
case GetPortStatus:
/* check port status */
dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
if (valid_port(wIndex)) {
if (!ohci_at91_usb_get_power(pdata, wIndex))
*data &= ~cpu_to_le32(RH_PS_PPS);
if (pdata->overcurrent_changed[wIndex])
*data |= cpu_to_le32(RH_PS_OCIC);
if (pdata->overcurrent_status[wIndex])
*data |= cpu_to_le32(RH_PS_POCI);
}
}
out:
return ret;
}
/*-------------------------------------------------------------------------*/
static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
{
struct platform_device *pdev = data;
struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
int val, gpio, port;
/* From the GPIO notifying the over-current situation, find
* out the corresponding port */
at91_for_each_port(port) {
if (gpio_is_valid(pdata->overcurrent_pin[port]) &&
gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
gpio = pdata->overcurrent_pin[port];
break;
}
}
if (port == AT91_MAX_USBH_PORTS) {
dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");
return IRQ_HANDLED;
}
val = gpio_get_value(gpio);
/* When notified of an over-current situation, disable power
on the corresponding port, and mark this port in
over-current. */
if (!val) {
ohci_at91_usb_set_power(pdata, port, 0);
pdata->overcurrent_status[port] = 1;
pdata->overcurrent_changed[port] = 1;
}
dev_dbg(& pdev->dev, "overcurrent situation %s\n",
val ? "exited" : "notified");
return IRQ_HANDLED;
}
static const struct of_device_id at91_ohci_dt_ids[] = {
{ .compatible = "atmel,at91rm9200-ohci" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, at91_ohci_dt_ids);
/*-------------------------------------------------------------------------*/
static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct at91_usbh_data *pdata;
int i;
int gpio;
int ret;
enum of_gpio_flags flags;
u32 ports;
/* Right now device-tree probed devices don't get dma_mask set.
* Since shared usb code relies on it, set it here for now.
* Once we have dma capability bindings this can go away.
*/
ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdev->dev.platform_data = pdata;
if (!of_property_read_u32(np, "num-ports", &ports))
pdata->ports = ports;
at91_for_each_port(i) {
/*
* do not configure PIO if not in relation with
* real USB port on board
*/
if (i >= pdata->ports) {
pdata->vbus_pin[i] = -EINVAL;
pdata->overcurrent_pin[i] = -EINVAL;
continue;
}
gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i,
&flags);
pdata->vbus_pin[i] = gpio;
if (!gpio_is_valid(gpio))
continue;
pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
ret = gpio_request(gpio, "ohci_vbus");
if (ret) {
dev_err(&pdev->dev,
"can't request vbus gpio %d\n", gpio);
continue;
}
ret = gpio_direction_output(gpio,
!pdata->vbus_pin_active_low[i]);
if (ret) {
dev_err(&pdev->dev,
"can't put vbus gpio %d as output %d\n",
gpio, !pdata->vbus_pin_active_low[i]);
gpio_free(gpio);
continue;
}
ohci_at91_usb_set_power(pdata, i, 1);
}
at91_for_each_port(i) {
if (i >= pdata->ports)
break;
pdata->overcurrent_pin[i] =
of_get_named_gpio_flags(np, "atmel,oc-gpio", i, &flags);
if (!gpio_is_valid(pdata->overcurrent_pin[i]))
continue;
gpio = pdata->overcurrent_pin[i];
ret = gpio_request(gpio, "ohci_overcurrent");
if (ret) {
dev_err(&pdev->dev,
"can't request overcurrent gpio %d\n",
gpio);
continue;
}
ret = gpio_direction_input(gpio);
if (ret) {
dev_err(&pdev->dev,
"can't configure overcurrent gpio %d as input\n",
gpio);
gpio_free(gpio);
continue;
}
ret = request_irq(gpio_to_irq(gpio),
ohci_hcd_at91_overcurrent_irq,
IRQF_SHARED, "ohci_overcurrent", pdev);
if (ret) {
gpio_free(gpio);
dev_err(&pdev->dev,
"can't get gpio IRQ for overcurrent\n");
}
}
device_init_wakeup(&pdev->dev, 1);
return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
}
static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
{
struct at91_usbh_data *pdata = dev_get_platdata(&pdev->dev);
int i;
if (pdata) {
at91_for_each_port(i) {
if (!gpio_is_valid(pdata->vbus_pin[i]))
continue;
ohci_at91_usb_set_power(pdata, i, 0);
gpio_free(pdata->vbus_pin[i]);
}
at91_for_each_port(i) {
if (!gpio_is_valid(pdata->overcurrent_pin[i]))
continue;
free_irq(gpio_to_irq(pdata->overcurrent_pin[i]), pdev);
gpio_free(pdata->overcurrent_pin[i]);
}
}
device_init_wakeup(&pdev->dev, 0);
usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
return 0;
}
static int __maybe_unused
ohci_hcd_at91_drv_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
int ret;
/*
* Disable wakeup if we are going to sleep with slow clock mode
* enabled.
*/
ohci_at91->wakeup = device_may_wakeup(dev)
&& !at91_suspend_entering_slow_clock();
if (ohci_at91->wakeup)
enable_irq_wake(hcd->irq);
ret = ohci_suspend(hcd, ohci_at91->wakeup);
if (ret) {
if (ohci_at91->wakeup)
disable_irq_wake(hcd->irq);
return ret;
}
/*
* The integrated transceivers seem unable to notice disconnect,
* reconnect, or wakeup without the 48 MHz clock active. so for
* correctness, always discard connection state (using reset).
*
* REVISIT: some boards will be able to turn VBUS off...
*/
if (!ohci_at91->wakeup) {
ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
ohci->hc_control &= OHCI_CTRL_RWC;
ohci_writel(ohci, ohci->hc_control, &ohci->regs->control);
ohci->rh_state = OHCI_RH_HALTED;
/* flush the writes */
(void) ohci_readl (ohci, &ohci->regs->control);
at91_stop_clock(ohci_at91);
}
return ret;
}
static int __maybe_unused
ohci_hcd_at91_drv_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
if (ohci_at91->wakeup)
disable_irq_wake(hcd->irq);
at91_start_clock(ohci_at91);
ohci_resume(hcd, false);
return 0;
}
static SIMPLE_DEV_PM_OPS(ohci_hcd_at91_pm_ops, ohci_hcd_at91_drv_suspend,
ohci_hcd_at91_drv_resume);
static struct platform_driver ohci_hcd_at91_driver = {
.probe = ohci_hcd_at91_drv_probe,
.remove = ohci_hcd_at91_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "at91_ohci",
.pm = &ohci_hcd_at91_pm_ops,
.of_match_table = at91_ohci_dt_ids,
},
};
static int __init ohci_at91_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ohci_init_driver(&ohci_at91_hc_driver, &ohci_at91_drv_overrides);
/*
* The Atmel HW has some unusual quirks, which require Atmel-specific
* workarounds. We override certain hc_driver functions here to
* achieve that. We explicitly do not enhance ohci_driver_overrides to
* allow this more easily, since this is an unusual case, and we don't
* want to encourage others to override these functions by making it
* too easy.
*/
ohci_at91_hc_driver.hub_status_data = ohci_at91_hub_status_data;
ohci_at91_hc_driver.hub_control = ohci_at91_hub_control;
return platform_driver_register(&ohci_hcd_at91_driver);
}
module_init(ohci_at91_init);
static void __exit ohci_at91_cleanup(void)
{
platform_driver_unregister(&ohci_hcd_at91_driver);
}
module_exit(ohci_at91_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:at91_ohci");