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alistair23-linux/drivers/usb/host/ehci-platform.c
Greg Kroah-Hartman d214109875 USB: host: ehci: Remove redundant license text 
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.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-07 15:45:02 +01:00

446 lines
11 KiB
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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/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/reset.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)
struct ehci_platform_priv {
struct clk *clks[EHCI_MAX_CLKS];
struct reset_control *rsts;
struct phy **phys;
int num_phys;
bool reset_on_resume;
};
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;
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, phy_num;
for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
ret = clk_prepare_enable(priv->clks[clk]);
if (ret)
goto err_disable_clks;
}
for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
ret = phy_init(priv->phys[phy_num]);
if (ret)
goto err_exit_phy;
ret = phy_power_on(priv->phys[phy_num]);
if (ret) {
phy_exit(priv->phys[phy_num]);
goto err_exit_phy;
}
}
return 0;
err_exit_phy:
while (--phy_num >= 0) {
phy_power_off(priv->phys[phy_num]);
phy_exit(priv->phys[phy_num]);
}
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, phy_num;
for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
phy_power_off(priv->phys[phy_num]);
phy_exit(priv->phys[phy_num]);
}
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, phy_num, 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(32));
if (err) {
dev_err(&dev->dev, "Error: DMA mask configuration failed\n");
return err;
}
irq = platform_get_irq(dev, 0);
if (irq < 0) {
dev_err(&dev->dev, "no irq provided");
return irq;
}
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;
if (of_property_read_bool(dev->dev.of_node,
"needs-reset-on-resume"))
priv->reset_on_resume = true;
if (of_property_read_bool(dev->dev.of_node,
"has-transaction-translator"))
hcd->has_tt = 1;
priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
"phys", "#phy-cells");
if (priv->num_phys > 0) {
priv->phys = devm_kcalloc(&dev->dev, priv->num_phys,
sizeof(struct phy *), GFP_KERNEL);
if (!priv->phys)
return -ENOMEM;
} else
priv->num_phys = 0;
for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
priv->phys[phy_num] = devm_of_phy_get_by_index(
&dev->dev, dev->dev.of_node, phy_num);
if (IS_ERR(priv->phys[phy_num])) {
err = PTR_ERR(priv->phys[phy_num]);
goto err_put_hcd;
} else if (!hcd->phy) {
/* Avoiding phy_get() in usb_add_hcd() */
hcd->phy = priv->phys[phy_num];
}
}
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;
}
}
}
priv->rsts = devm_reset_control_array_get_optional_shared(&dev->dev);
if (IS_ERR(priv->rsts)) {
err = PTR_ERR(priv->rsts);
goto err_put_clks;
}
err = reset_control_deassert(priv->rsts);
if (err)
goto err_put_clks;
if (pdata->big_endian_desc)
ehci->big_endian_desc = 1;
if (pdata->big_endian_mmio)
ehci->big_endian_mmio = 1;
if (pdata->has_tt)
hcd->has_tt = 1;
if (pdata->reset_on_resume)
priv->reset_on_resume = true;
#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_reset;
}
#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_reset;
}
#endif
if (pdata->power_on) {
err = pdata->power_on(dev);
if (err < 0)
goto err_reset;
}
res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
if (IS_ERR(hcd->regs)) {
err = PTR_ERR(hcd->regs);
goto err_power;
}
hcd->rsrc_start = res_mem->start;
hcd->rsrc_len = resource_size(res_mem);
err = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (err)
goto err_power;
device_wakeup_enable(hcd->self.controller);
device_enable_async_suspend(hcd->self.controller);
platform_set_drvdata(dev, hcd);
return err;
err_power:
if (pdata->power_off)
pdata->power_off(dev);
err_reset:
reset_control_assert(priv->rsts);
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);
reset_control_assert(priv->rsts);
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_SLEEP
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 = to_platform_device(dev);
bool do_wakeup = device_may_wakeup(dev);
int ret;
ret = ehci_suspend(hcd, do_wakeup);
if (ret)
return ret;
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 = to_platform_device(dev);
struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
struct device *companion_dev;
if (pdata->power_on) {
int err = pdata->power_on(pdev);
if (err < 0)
return err;
}
companion_dev = usb_of_get_companion_dev(hcd->self.controller);
if (companion_dev) {
device_pm_wait_for_dev(hcd->self.controller, companion_dev);
put_device(companion_dev);
}
ehci_resume(hcd, priv->reset_on_resume);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
static const struct of_device_id vt8500_ehci_ids[] = {
{ .compatible = "via,vt8500-ehci", },
{ .compatible = "wm,prizm-ehci", },
{ .compatible = "generic-ehci", },
{ .compatible = "cavium,octeon-6335-ehci", },
{}
};
MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
static const struct acpi_device_id ehci_acpi_match[] = {
{ "PNP0D20", 0 }, /* EHCI controller without debug */
{ }
};
MODULE_DEVICE_TABLE(acpi, ehci_acpi_match);
static const struct platform_device_id ehci_platform_table[] = {
{ "ehci-platform", 0 },
{ }
};
MODULE_DEVICE_TABLE(platform, ehci_platform_table);
static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
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 = {
.name = "ehci-platform",
.pm = &ehci_platform_pm_ops,
.of_match_table = vt8500_ehci_ids,
.acpi_match_table = ACPI_PTR(ehci_acpi_match),
}
};
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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