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linux/drivers/usb/host/ehci-platform.c
Alan Stern 843d5e0364 USB: ehci-platform: check for platform data misconfiguration 
The ehci-platform driver checks for misconfigurations in cases where
the Device Tree data specifies big-endian registers or descriptors but
the corresponding driver config settings have not been enabled.  As
Jonas Gorski suggested, we may as well apply the same check to general
platform data too.

This requires moving the code that sets the big-endian quirk flags
from the ehci_platform_reset() routine into ehci_platform_probe(), and
moving the checks out of the DT-specific "if" statement clause.

The patch also changes the text of the error messages in an attempt to
make the nature of the error more clear.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Jonas Gorski <jogo@openwrt.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-11 13:39:54 -08:00

389 lines
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/*
* 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
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#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/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/ehci_pdriver.h>
#include "ehci.h"
#define DRIVER_DESC "EHCI generic platform driver"
#define EHCI_MAX_CLKS 3
#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
struct ehci_platform_priv {
struct clk *clks[EHCI_MAX_CLKS];
struct phy *phy;
};
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;
hcd->has_tt = pdata->has_tt;
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;
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;
}
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 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;
if (priv->phy) {
phy_power_off(priv->phy);
phy_exit(priv->phy);
}
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,
};
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, 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(&ehci_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_ehci_priv(hcd);
ehci = hcd_to_ehci(hcd);
if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
ehci->big_endian_mmio = 1;
if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
ehci->big_endian_desc = 1;
if (of_property_read_bool(dev->dev.of_node, "big-endian"))
ehci->big_endian_mmio = ehci->big_endian_desc = 1;
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 < EHCI_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;
}
}
}
if (pdata->big_endian_desc)
ehci->big_endian_desc = 1;
if (pdata->big_endian_mmio)
ehci->big_endian_mmio = 1;
#ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
if (ehci->big_endian_mmio) {
dev_err(&dev->dev,
"Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
err = -EINVAL;
goto err_put_clks;
}
#endif
#ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
if (ehci->big_endian_desc) {
dev_err(&dev->dev,
"Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
err = -EINVAL;
goto err_put_clks;
}
#endif
if (pdata->power_on) {
err = pdata->power_on(dev);
if (err < 0)
goto err_put_clks;
}
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_put_clks:
while (--clk >= 0)
clk_put(priv->clks[clk]);
err_put_hcd:
if (pdata == &ehci_platform_defaults)
dev->dev.platform_data = NULL;
usb_put_hcd(hcd);
return err;
}
static int ehci_platform_remove(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
int clk;
usb_remove_hcd(hcd);
if (pdata->power_off)
pdata->power_off(dev);
for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
clk_put(priv->clks[clk]);
usb_put_hcd(hcd);
if (pdata == &ehci_platform_defaults)
dev->dev.platform_data = NULL;
return 0;
}
#ifdef CONFIG_PM
static int ehci_platform_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
struct platform_device *pdev =
container_of(dev, struct platform_device, dev);
bool do_wakeup = device_may_wakeup(dev);
int ret;
ret = ehci_suspend(hcd, do_wakeup);
if (pdata->power_suspend)
pdata->power_suspend(pdev);
return ret;
}
static int ehci_platform_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct usb_ehci_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;
}
ehci_resume(hcd, false);
return 0;
}
#else /* !CONFIG_PM */
#define ehci_platform_suspend NULL
#define ehci_platform_resume NULL
#endif /* CONFIG_PM */
static const struct of_device_id vt8500_ehci_ids[] = {
{ .compatible = "via,vt8500-ehci", },
{ .compatible = "wm,prizm-ehci", },
{ .compatible = "generic-ehci", },
{}
};
MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
static const struct platform_device_id ehci_platform_table[] = {
{ "ehci-platform", 0 },
{ }
};
MODULE_DEVICE_TABLE(platform, ehci_platform_table);
static const struct dev_pm_ops ehci_platform_pm_ops = {
.suspend = ehci_platform_suspend,
.resume = ehci_platform_resume,
};
static struct platform_driver ehci_platform_driver = {
.id_table = ehci_platform_table,
.probe = ehci_platform_probe,
.remove = ehci_platform_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.owner = THIS_MODULE,
.name = "ehci-platform",
.pm = &ehci_platform_pm_ops,
.of_match_table = vt8500_ehci_ids,
}
};
static int __init ehci_platform_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
return platform_driver_register(&ehci_platform_driver);
}
module_init(ehci_platform_init);
static void __exit ehci_platform_cleanup(void)
{
platform_driver_unregister(&ehci_platform_driver);
}
module_exit(ehci_platform_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Hauke Mehrtens");
MODULE_AUTHOR("Alan Stern");
MODULE_LICENSE("GPL");
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