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linux-sg2042/drivers/usb/host/ohci-platform.c

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/*
* Generic platform ohci driver
*
* Copyright 2007 Michael Buesch <m@bues.ch>
* Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
* Copyright 2014 Hans de Goede <hdegoede@redhat.com>
*
* Derived from the OCHI-SSB driver
* Derived from the OHCI-PCI driver
* Copyright 1999 Roman Weissgaerber
* Copyright 2000-2002 David Brownell
* Copyright 1999 Linus Torvalds
* Copyright 1999 Gregory P. Smith
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/hrtimer.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/usb/ohci_pdriver.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ohci.h"
#define DRIVER_DESC "OHCI generic platform driver"
#define OHCI_MAX_CLKS 3
#define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
struct ohci_platform_priv {
struct clk *clks[OHCI_MAX_CLKS];
struct reset_control *rst;
struct phy *phy;
};
static const char hcd_name[] = "ohci-platform";
static int ohci_platform_reset(struct usb_hcd *hcd)
{
struct platform_device *pdev = to_platform_device(hcd->self.controller);
struct usb_ohci_pdata *pdata = dev_get_platdata(&pdev->dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
if (pdata->no_big_frame_no)
ohci->flags |= OHCI_QUIRK_FRAME_NO;
if (pdata->num_ports)
ohci->num_ports = pdata->num_ports;
return ohci_setup(hcd);
}
static int ohci_platform_power_on(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
int clk, ret;
for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
ret = clk_prepare_enable(priv->clks[clk]);
if (ret)
goto err_disable_clks;
}
if (priv->phy) {
ret = phy_init(priv->phy);
if (ret)
goto err_disable_clks;
ret = phy_power_on(priv->phy);
if (ret)
goto err_exit_phy;
}
return 0;
err_exit_phy:
phy_exit(priv->phy);
err_disable_clks:
while (--clk >= 0)
clk_disable_unprepare(priv->clks[clk]);
return ret;
}
static void ohci_platform_power_off(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
int clk;
if (priv->phy) {
phy_power_off(priv->phy);
phy_exit(priv->phy);
}
for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
if (priv->clks[clk])
clk_disable_unprepare(priv->clks[clk]);
}
static struct hc_driver __read_mostly ohci_platform_hc_driver;
static const struct ohci_driver_overrides platform_overrides __initconst = {
.product_desc = "Generic Platform OHCI controller",
.reset = ohci_platform_reset,
.extra_priv_size = sizeof(struct ohci_platform_priv),
};
static struct usb_ohci_pdata ohci_platform_defaults = {
.power_on = ohci_platform_power_on,
.power_suspend = ohci_platform_power_off,
.power_off = ohci_platform_power_off,
};
static int ohci_platform_probe(struct platform_device *dev)
{
struct usb_hcd *hcd;
struct resource *res_mem;
struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
struct ohci_platform_priv *priv;
struct ohci_hcd *ohci;
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 = &ohci_platform_defaults;
err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
if (err)
return err;
irq = platform_get_irq(dev, 0);
if (irq < 0) {
dev_err(&dev->dev, "no irq provided");
return irq;
}
res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!res_mem) {
dev_err(&dev->dev, "no memory resource provided");
return -ENXIO;
}
hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
dev_name(&dev->dev));
if (!hcd)
return -ENOMEM;
platform_set_drvdata(dev, hcd);
dev->dev.platform_data = pdata;
priv = hcd_to_ohci_priv(hcd);
ohci = hcd_to_ohci(hcd);
if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
ohci->flags |= OHCI_QUIRK_BE_MMIO;
if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
ohci->flags |= OHCI_QUIRK_BE_DESC;
if (of_property_read_bool(dev->dev.of_node, "big-endian"))
ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
priv->phy = devm_phy_get(&dev->dev, "usb");
if (IS_ERR(priv->phy)) {
err = PTR_ERR(priv->phy);
if (err == -EPROBE_DEFER)
goto err_put_hcd;
priv->phy = NULL;
}
for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
if (IS_ERR(priv->clks[clk])) {
err = PTR_ERR(priv->clks[clk]);
if (err == -EPROBE_DEFER)
goto err_put_clks;
priv->clks[clk] = NULL;
break;
}
}
}
priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
if (IS_ERR(priv->rst)) {
err = PTR_ERR(priv->rst);
if (err == -EPROBE_DEFER)
goto err_put_clks;
priv->rst = NULL;
} else {
err = reset_control_deassert(priv->rst);
if (err)
goto err_put_clks;
}
if (pdata->big_endian_desc)
ohci->flags |= OHCI_QUIRK_BE_DESC;
if (pdata->big_endian_mmio)
ohci->flags |= OHCI_QUIRK_BE_MMIO;
#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
dev_err(&dev->dev,
"Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
err = -EINVAL;
goto err_reset;
}
#endif
#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
if (ohci->flags & OHCI_QUIRK_BE_DESC) {
dev_err(&dev->dev,
"Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
err = -EINVAL;
goto err_reset;
}
#endif
if (pdata->power_on) {
err = pdata->power_on(dev);
if (err < 0)
goto err_reset;
}
hcd->rsrc_start = res_mem->start;
hcd->rsrc_len = resource_size(res_mem);
hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
if (IS_ERR(hcd->regs)) {
err = PTR_ERR(hcd->regs);
goto err_power;
}
err = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (err)
goto err_power;
device_wakeup_enable(hcd->self.controller);
platform_set_drvdata(dev, hcd);
return err;
err_power:
if (pdata->power_off)
pdata->power_off(dev);
err_reset:
if (priv->rst)
reset_control_assert(priv->rst);
err_put_clks:
while (--clk >= 0)
clk_put(priv->clks[clk]);
err_put_hcd:
if (pdata == &ohci_platform_defaults)
dev->dev.platform_data = NULL;
usb_put_hcd(hcd);
return err;
}
static int ohci_platform_remove(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
int clk;
usb_remove_hcd(hcd);
if (pdata->power_off)
pdata->power_off(dev);
if (priv->rst)
reset_control_assert(priv->rst);
for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
clk_put(priv->clks[clk]);
usb_put_hcd(hcd);
if (pdata == &ohci_platform_defaults)
dev->dev.platform_data = NULL;
return 0;
}
#ifdef CONFIG_PM
static int ohci_platform_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct usb_ohci_pdata *pdata = dev->platform_data;
struct platform_device *pdev =
container_of(dev, struct platform_device, dev);
bool do_wakeup = device_may_wakeup(dev);
int ret;
ret = ohci_suspend(hcd, do_wakeup);
if (ret)
return ret;
if (pdata->power_suspend)
pdata->power_suspend(pdev);
return ret;
}
static int ohci_platform_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
struct platform_device *pdev =
container_of(dev, struct platform_device, dev);
if (pdata->power_on) {
int err = pdata->power_on(pdev);
if (err < 0)
return err;
}
ohci_resume(hcd, false);
return 0;
}
#else /* !CONFIG_PM */
#define ohci_platform_suspend NULL
#define ohci_platform_resume NULL
#endif /* CONFIG_PM */
static const struct of_device_id ohci_platform_ids[] = {
{ .compatible = "generic-ohci", },
{ }
};
MODULE_DEVICE_TABLE(of, ohci_platform_ids);
static const struct platform_device_id ohci_platform_table[] = {
{ "ohci-platform", 0 },
{ }
};
MODULE_DEVICE_TABLE(platform, ohci_platform_table);
static const struct dev_pm_ops ohci_platform_pm_ops = {
.suspend = ohci_platform_suspend,
.resume = ohci_platform_resume,
};
static struct platform_driver ohci_platform_driver = {
.id_table = ohci_platform_table,
.probe = ohci_platform_probe,
.remove = ohci_platform_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.owner = THIS_MODULE,
.name = "ohci-platform",
.pm = &ohci_platform_pm_ops,
.of_match_table = ohci_platform_ids,
}
};
static int __init ohci_platform_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
return platform_driver_register(&ohci_platform_driver);
}
module_init(ohci_platform_init);
static void __exit ohci_platform_cleanup(void)
{
platform_driver_unregister(&ohci_platform_driver);
}
module_exit(ohci_platform_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Hauke Mehrtens");
MODULE_AUTHOR("Alan Stern");
MODULE_LICENSE("GPL");
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