309 lines
6.9 KiB
C
309 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* SAMSUNG EXYNOS USB HOST OHCI Controller
|
|
*
|
|
* Copyright (C) 2011 Samsung Electronics Co.Ltd
|
|
* Author: Jingoo Han <jg1.han@samsung.com>
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/phy/phy.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/hcd.h>
|
|
|
|
#include "ohci.h"
|
|
|
|
#define DRIVER_DESC "OHCI EXYNOS driver"
|
|
|
|
static const char hcd_name[] = "ohci-exynos";
|
|
static struct hc_driver __read_mostly exynos_ohci_hc_driver;
|
|
|
|
#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
|
|
|
|
#define PHY_NUMBER 3
|
|
|
|
struct exynos_ohci_hcd {
|
|
struct clk *clk;
|
|
struct phy *phy[PHY_NUMBER];
|
|
};
|
|
|
|
static int exynos_ohci_get_phy(struct device *dev,
|
|
struct exynos_ohci_hcd *exynos_ohci)
|
|
{
|
|
struct device_node *child;
|
|
struct phy *phy;
|
|
int phy_number;
|
|
int ret;
|
|
|
|
/* Get PHYs for the controller */
|
|
for_each_available_child_of_node(dev->of_node, child) {
|
|
ret = of_property_read_u32(child, "reg", &phy_number);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to parse device tree\n");
|
|
of_node_put(child);
|
|
return ret;
|
|
}
|
|
|
|
if (phy_number >= PHY_NUMBER) {
|
|
dev_err(dev, "Invalid number of PHYs\n");
|
|
of_node_put(child);
|
|
return -EINVAL;
|
|
}
|
|
|
|
phy = devm_of_phy_get(dev, child, NULL);
|
|
exynos_ohci->phy[phy_number] = phy;
|
|
if (IS_ERR(phy)) {
|
|
ret = PTR_ERR(phy);
|
|
if (ret == -EPROBE_DEFER) {
|
|
of_node_put(child);
|
|
return ret;
|
|
} else if (ret != -ENOSYS && ret != -ENODEV) {
|
|
dev_err(dev,
|
|
"Error retrieving usb2 phy: %d\n", ret);
|
|
of_node_put(child);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int exynos_ohci_phy_enable(struct device *dev)
|
|
{
|
|
struct usb_hcd *hcd = dev_get_drvdata(dev);
|
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
|
|
int i;
|
|
int ret = 0;
|
|
|
|
for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
|
|
if (!IS_ERR(exynos_ohci->phy[i]))
|
|
ret = phy_power_on(exynos_ohci->phy[i]);
|
|
if (ret)
|
|
for (i--; i >= 0; i--)
|
|
if (!IS_ERR(exynos_ohci->phy[i]))
|
|
phy_power_off(exynos_ohci->phy[i]);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void exynos_ohci_phy_disable(struct device *dev)
|
|
{
|
|
struct usb_hcd *hcd = dev_get_drvdata(dev);
|
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
|
|
int i;
|
|
|
|
for (i = 0; i < PHY_NUMBER; i++)
|
|
if (!IS_ERR(exynos_ohci->phy[i]))
|
|
phy_power_off(exynos_ohci->phy[i]);
|
|
}
|
|
|
|
static int exynos_ohci_probe(struct platform_device *pdev)
|
|
{
|
|
struct exynos_ohci_hcd *exynos_ohci;
|
|
struct usb_hcd *hcd;
|
|
struct resource *res;
|
|
int irq;
|
|
int err;
|
|
|
|
/*
|
|
* Right now device-tree probed devices don't get dma_mask set.
|
|
* Since shared usb code relies on it, set it here for now.
|
|
* Once we move to full device tree support this will vanish off.
|
|
*/
|
|
err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
|
|
if (err)
|
|
return err;
|
|
|
|
hcd = usb_create_hcd(&exynos_ohci_hc_driver,
|
|
&pdev->dev, dev_name(&pdev->dev));
|
|
if (!hcd) {
|
|
dev_err(&pdev->dev, "Unable to create HCD\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
exynos_ohci = to_exynos_ohci(hcd);
|
|
|
|
if (of_device_is_compatible(pdev->dev.of_node,
|
|
"samsung,exynos5440-ohci"))
|
|
goto skip_phy;
|
|
|
|
err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
|
|
if (err)
|
|
goto fail_clk;
|
|
|
|
skip_phy:
|
|
exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
|
|
|
|
if (IS_ERR(exynos_ohci->clk)) {
|
|
dev_err(&pdev->dev, "Failed to get usbhost clock\n");
|
|
err = PTR_ERR(exynos_ohci->clk);
|
|
goto fail_clk;
|
|
}
|
|
|
|
err = clk_prepare_enable(exynos_ohci->clk);
|
|
if (err)
|
|
goto fail_clk;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
hcd->regs = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(hcd->regs)) {
|
|
err = PTR_ERR(hcd->regs);
|
|
goto fail_io;
|
|
}
|
|
hcd->rsrc_start = res->start;
|
|
hcd->rsrc_len = resource_size(res);
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (!irq) {
|
|
dev_err(&pdev->dev, "Failed to get IRQ\n");
|
|
err = -ENODEV;
|
|
goto fail_io;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, hcd);
|
|
|
|
err = exynos_ohci_phy_enable(&pdev->dev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Failed to enable USB phy\n");
|
|
goto fail_io;
|
|
}
|
|
|
|
err = usb_add_hcd(hcd, irq, IRQF_SHARED);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "Failed to add USB HCD\n");
|
|
goto fail_add_hcd;
|
|
}
|
|
device_wakeup_enable(hcd->self.controller);
|
|
return 0;
|
|
|
|
fail_add_hcd:
|
|
exynos_ohci_phy_disable(&pdev->dev);
|
|
fail_io:
|
|
clk_disable_unprepare(exynos_ohci->clk);
|
|
fail_clk:
|
|
usb_put_hcd(hcd);
|
|
return err;
|
|
}
|
|
|
|
static int exynos_ohci_remove(struct platform_device *pdev)
|
|
{
|
|
struct usb_hcd *hcd = platform_get_drvdata(pdev);
|
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
|
|
|
|
usb_remove_hcd(hcd);
|
|
|
|
exynos_ohci_phy_disable(&pdev->dev);
|
|
|
|
clk_disable_unprepare(exynos_ohci->clk);
|
|
|
|
usb_put_hcd(hcd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void exynos_ohci_shutdown(struct platform_device *pdev)
|
|
{
|
|
struct usb_hcd *hcd = platform_get_drvdata(pdev);
|
|
|
|
if (hcd->driver->shutdown)
|
|
hcd->driver->shutdown(hcd);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int exynos_ohci_suspend(struct device *dev)
|
|
{
|
|
struct usb_hcd *hcd = dev_get_drvdata(dev);
|
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
|
|
bool do_wakeup = device_may_wakeup(dev);
|
|
int rc = ohci_suspend(hcd, do_wakeup);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
exynos_ohci_phy_disable(dev);
|
|
|
|
clk_disable_unprepare(exynos_ohci->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int exynos_ohci_resume(struct device *dev)
|
|
{
|
|
struct usb_hcd *hcd = dev_get_drvdata(dev);
|
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
|
|
int ret;
|
|
|
|
clk_prepare_enable(exynos_ohci->clk);
|
|
|
|
ret = exynos_ohci_phy_enable(dev);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to enable USB phy\n");
|
|
clk_disable_unprepare(exynos_ohci->clk);
|
|
return ret;
|
|
}
|
|
|
|
ohci_resume(hcd, false);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define exynos_ohci_suspend NULL
|
|
#define exynos_ohci_resume NULL
|
|
#endif
|
|
|
|
static const struct ohci_driver_overrides exynos_overrides __initconst = {
|
|
.extra_priv_size = sizeof(struct exynos_ohci_hcd),
|
|
};
|
|
|
|
static const struct dev_pm_ops exynos_ohci_pm_ops = {
|
|
.suspend = exynos_ohci_suspend,
|
|
.resume = exynos_ohci_resume,
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id exynos_ohci_match[] = {
|
|
{ .compatible = "samsung,exynos4210-ohci" },
|
|
{ .compatible = "samsung,exynos5440-ohci" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, exynos_ohci_match);
|
|
#endif
|
|
|
|
static struct platform_driver exynos_ohci_driver = {
|
|
.probe = exynos_ohci_probe,
|
|
.remove = exynos_ohci_remove,
|
|
.shutdown = exynos_ohci_shutdown,
|
|
.driver = {
|
|
.name = "exynos-ohci",
|
|
.pm = &exynos_ohci_pm_ops,
|
|
.of_match_table = of_match_ptr(exynos_ohci_match),
|
|
}
|
|
};
|
|
static int __init ohci_exynos_init(void)
|
|
{
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
|
|
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
|
|
ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
|
|
return platform_driver_register(&exynos_ohci_driver);
|
|
}
|
|
module_init(ohci_exynos_init);
|
|
|
|
static void __exit ohci_exynos_cleanup(void)
|
|
{
|
|
platform_driver_unregister(&exynos_ohci_driver);
|
|
}
|
|
module_exit(ohci_exynos_cleanup);
|
|
|
|
MODULE_ALIAS("platform:exynos-ohci");
|
|
MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
|
|
MODULE_LICENSE("GPL v2");
|