Contributors: 47
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Hans de Goede |
540 |
22.77% |
4 |
5.48% |
| Hauke Mehrtens |
499 |
21.04% |
1 |
1.37% |
| Yoshihiro Shimoda |
488 |
20.57% |
2 |
2.74% |
| Kuninori Morimoto |
164 |
6.91% |
2 |
2.74% |
| Alan Stern |
104 |
4.38% |
6 |
8.22% |
| Arnd Bergmann |
58 |
2.45% |
1 |
1.37% |
| Boris Brezillon |
54 |
2.28% |
1 |
1.37% |
| Linus Torvalds |
40 |
1.69% |
4 |
5.48% |
| Florian Fainelli |
40 |
1.69% |
4 |
5.48% |
| Jeremy Linton |
35 |
1.48% |
2 |
2.74% |
| Chris Packham |
34 |
1.43% |
2 |
2.74% |
| Alban Bedel |
31 |
1.31% |
1 |
1.37% |
| Neal Liu |
30 |
1.26% |
1 |
1.37% |
| Tony Prisk |
25 |
1.05% |
1 |
1.37% |
| Álvaro Fernández Rojas |
19 |
0.80% |
1 |
1.37% |
| Andreas Herrmann |
16 |
0.67% |
2 |
2.74% |
| Thierry Reding |
15 |
0.63% |
1 |
1.37% |
| Qais Yousef |
15 |
0.63% |
1 |
1.37% |
| Sergei Shtylyov |
15 |
0.63% |
1 |
1.37% |
| Jingoo Han |
14 |
0.59% |
1 |
1.37% |
| Russell King |
14 |
0.59% |
2 |
2.74% |
| William Wu |
12 |
0.51% |
1 |
1.37% |
| Linus Torvalds (pre-git) |
11 |
0.46% |
6 |
8.22% |
| Julia Lawall |
8 |
0.34% |
1 |
1.37% |
| Joachim Eastwood |
8 |
0.34% |
1 |
1.37% |
| Amelie Delaunay |
7 |
0.30% |
1 |
1.37% |
| Johan Hovold |
7 |
0.30% |
1 |
1.37% |
| Jiancheng Xue |
7 |
0.30% |
1 |
1.37% |
| Vivek Gautam |
7 |
0.30% |
1 |
1.37% |
| Randy Dunlap |
7 |
0.30% |
1 |
1.37% |
| Wonhong Kwon |
6 |
0.25% |
1 |
1.37% |
| Dmitry Torokhov |
5 |
0.21% |
1 |
1.37% |
| Paul Cercueil |
5 |
0.21% |
1 |
1.37% |
| Lee Jones |
5 |
0.21% |
1 |
1.37% |
| Peter Chen |
4 |
0.17% |
1 |
1.37% |
| Kishon Vijay Abraham I |
3 |
0.13% |
1 |
1.37% |
| Masahiro Yamada |
3 |
0.13% |
1 |
1.37% |
| Arun Ramamurthy |
2 |
0.08% |
1 |
1.37% |
| Geliang Tang |
2 |
0.08% |
1 |
1.37% |
| Greg Kroah-Hartman |
2 |
0.08% |
2 |
2.74% |
| Eric Lescouet |
2 |
0.08% |
1 |
1.37% |
| Johannes Erdfelt |
2 |
0.08% |
1 |
1.37% |
| Uwe Kleine-König |
2 |
0.08% |
1 |
1.37% |
| Tony Jones |
2 |
0.08% |
1 |
1.37% |
| Icenowy Zheng |
1 |
0.04% |
1 |
1.37% |
| Andi Kleen |
1 |
0.04% |
1 |
1.37% |
| Varka Bhadram |
1 |
0.04% |
1 |
1.37% |
| Total |
2372 |
|
73 |
|
// 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/platform_device.h>
#include <linux/reset.h>
#include <linux/sys_soc.h>
#include <linux/timer.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)
#define BCM_USB_FIFO_THRESHOLD 0x00800040
struct ehci_platform_priv {
struct clk *clks[EHCI_MAX_CLKS];
struct reset_control *rsts;
bool reset_on_resume;
bool quirk_poll;
struct timer_list poll_timer;
struct delayed_work poll_work;
};
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;
if (of_device_is_compatible(pdev->dev.of_node, "brcm,xgs-iproc-ehci"))
ehci_writel(ehci, BCM_USB_FIFO_THRESHOLD,
&ehci->regs->brcm_insnreg[1]);
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;
}
return 0;
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;
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,
};
/**
* quirk_poll_check_port_status - Poll port_status if the device sticks
* @ehci: the ehci hcd pointer
*
* Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting
* stuck very rarely after a full/low usb device was disconnected. To
* detect such a situation, the controllers require a special way which poll
* the EHCI PORTSC register.
*
* Return: true if the controller's port_status indicated getting stuck
*/
static bool quirk_poll_check_port_status(struct ehci_hcd *ehci)
{
u32 port_status = ehci_readl(ehci, &ehci->regs->port_status[0]);
if (!(port_status & PORT_OWNER) &&
(port_status & PORT_POWER) &&
!(port_status & PORT_CONNECT) &&
(port_status & PORT_LS_MASK))
return true;
return false;
}
/**
* quirk_poll_rebind_companion - rebind comanion device to recover
* @ehci: the ehci hcd pointer
*
* Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting
* stuck very rarely after a full/low usb device was disconnected. To
* recover from such a situation, the controllers require changing the OHCI
* functional state.
*/
static void quirk_poll_rebind_companion(struct ehci_hcd *ehci)
{
struct device *companion_dev;
struct usb_hcd *hcd = ehci_to_hcd(ehci);
companion_dev = usb_of_get_companion_dev(hcd->self.controller);
if (!companion_dev)
return;
device_release_driver(companion_dev);
if (device_attach(companion_dev) < 0)
ehci_err(ehci, "%s: failed\n", __func__);
put_device(companion_dev);
}
static void quirk_poll_work(struct work_struct *work)
{
struct ehci_platform_priv *priv =
container_of(to_delayed_work(work), struct ehci_platform_priv,
poll_work);
struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd,
priv);
/* check the status twice to reduce misdetection rate */
if (!quirk_poll_check_port_status(ehci))
return;
udelay(10);
if (!quirk_poll_check_port_status(ehci))
return;
ehci_dbg(ehci, "%s: detected getting stuck. rebind now!\n", __func__);
quirk_poll_rebind_companion(ehci);
}
static void quirk_poll_timer(struct timer_list *t)
{
struct ehci_platform_priv *priv = from_timer(priv, t, poll_timer);
struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd,
priv);
if (quirk_poll_check_port_status(ehci)) {
/*
* Now scheduling the work for testing the port more. Note that
* updating the status is possible to be delayed when
* reconnection. So, this uses delayed work with 5 ms delay
* to avoid misdetection.
*/
schedule_delayed_work(&priv->poll_work, msecs_to_jiffies(5));
}
mod_timer(&priv->poll_timer, jiffies + HZ);
}
static void quirk_poll_init(struct ehci_platform_priv *priv)
{
INIT_DELAYED_WORK(&priv->poll_work, quirk_poll_work);
timer_setup(&priv->poll_timer, quirk_poll_timer, 0);
mod_timer(&priv->poll_timer, jiffies + HZ);
}
static void quirk_poll_end(struct ehci_platform_priv *priv)
{
del_timer_sync(&priv->poll_timer);
cancel_delayed_work(&priv->poll_work);
}
static const struct soc_device_attribute quirk_poll_match[] = {
{ .family = "R-Car Gen3" },
{ /* sentinel*/ }
};
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,
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)
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, "spurious-oc"))
ehci->spurious_oc = 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;
if (of_device_is_compatible(dev->dev.of_node,
"aspeed,ast2500-ehci") ||
of_device_is_compatible(dev->dev.of_node,
"aspeed,ast2600-ehci"))
ehci->is_aspeed = 1;
if (soc_device_match(quirk_poll_match))
priv->quirk_poll = true;
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;
if (pdata->spurious_oc)
ehci->spurious_oc = 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_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);
hcd->tpl_support = of_usb_host_tpl_support(dev->dev.of_node);
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);
if (priv->quirk_poll)
quirk_poll_init(priv);
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]);
if (pdata == &ehci_platform_defaults)
dev->dev.platform_data = NULL;
usb_put_hcd(hcd);
return err;
}
static void 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;
if (priv->quirk_poll)
quirk_poll_end(priv);
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;
}
static int __maybe_unused 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);
struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
bool do_wakeup = device_may_wakeup(dev);
int ret;
if (priv->quirk_poll)
quirk_poll_end(priv);
ret = ehci_suspend(hcd, do_wakeup);
if (ret)
return ret;
if (pdata->power_suspend)
pdata->power_suspend(pdev);
return ret;
}
static int __maybe_unused 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);
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
if (priv->quirk_poll)
quirk_poll_init(priv);
return 0;
}
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);
#ifdef CONFIG_ACPI
static const struct acpi_device_id ehci_acpi_match[] = {
{ "PNP0D20", 0 }, /* EHCI controller without debug */
{ }
};
MODULE_DEVICE_TABLE(acpi, ehci_acpi_match);
#endif
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_new = ehci_platform_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "ehci-platform",
.pm = pm_ptr(&ehci_platform_pm_ops),
.of_match_table = vt8500_ehci_ids,
.acpi_match_table = ACPI_PTR(ehci_acpi_match),
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
}
};
static int __init ehci_platform_init(void)
{
if (usb_disabled())
return -ENODEV;
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");