![Hans de Goede](/assets/img/avatar_default.png)
Add support for shared platform controllers by using devm_reset_control_get_shared_by_index instead of of_reset_control_get_by_index. Note we use the devm function because there is no of_reset_control_get_shared_by_index, this also leads to a nice cleanup of the cleanup code. This brings the ehci-platform reset handling code inline with ohci-platform. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
444 lines
11 KiB
C
444 lines
11 KiB
C
/*
|
|
* 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/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 "ehci.h"
|
|
|
|
#define DRIVER_DESC "EHCI generic platform driver"
|
|
#define EHCI_MAX_CLKS 3
|
|
#define EHCI_MAX_RSTS 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 reset_control *rsts[EHCI_MAX_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, rst;
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (rst = 0; rst < EHCI_MAX_RSTS; rst++) {
|
|
priv->rsts[rst] = devm_reset_control_get_shared_by_index(
|
|
&dev->dev, rst);
|
|
if (IS_ERR(priv->rsts[rst])) {
|
|
err = PTR_ERR(priv->rsts[rst]);
|
|
if (err == -EPROBE_DEFER)
|
|
goto err_reset;
|
|
priv->rsts[rst] = NULL;
|
|
break;
|
|
}
|
|
|
|
err = reset_control_deassert(priv->rsts[rst]);
|
|
if (err)
|
|
goto err_reset;
|
|
}
|
|
|
|
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);
|
|
platform_set_drvdata(dev, hcd);
|
|
|
|
return err;
|
|
|
|
err_power:
|
|
if (pdata->power_off)
|
|
pdata->power_off(dev);
|
|
err_reset:
|
|
while (--rst >= 0)
|
|
reset_control_assert(priv->rsts[rst]);
|
|
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, rst;
|
|
|
|
usb_remove_hcd(hcd);
|
|
|
|
if (pdata->power_off)
|
|
pdata->power_off(dev);
|
|
|
|
for (rst = 0; rst < EHCI_MAX_RSTS && priv->rsts[rst]; rst++)
|
|
reset_control_assert(priv->rsts[rst]);
|
|
|
|
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);
|
|
|
|
if (pdata->power_on) {
|
|
int err = pdata->power_on(pdev);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
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");
|