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/*
* SAMSUNG S5P USB HOST EHCI Controller
*
* Copyright (C) 2011 Samsung Electronics Co.Ltd
* Author: Jingoo Han <jg1.han@samsung.com>
* Author: Joonyoung Shim <jy0922.shim@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#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/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/platform_data/usb-ehci-s5p.h>
#include <linux/usb/phy.h>
#include <linux/usb/samsung_usb_phy.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/otg.h>
#include "ehci.h"
#define DRIVER_DESC "EHCI s5p driver"
#define EHCI_INSNREG00(base) (base + 0x90)
#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
#define EHCI_INSNREG00_ENABLE_DMA_BURST \
(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
static const char hcd_name[] = "ehci-s5p";
static struct hc_driver __read_mostly s5p_ehci_hc_driver;
struct s5p_ehci_hcd {
struct clk *clk;
struct usb_phy *phy;
struct usb_otg *otg;
struct s5p_ehci_platdata *pdata;
};
#define to_s5p_ehci(hcd) (struct s5p_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
static void s5p_setup_vbus_gpio(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
int err;
int gpio;
if (!dev->of_node)
return;
gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
if (!gpio_is_valid(gpio))
return;
err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
"ehci_vbus_gpio");
if (err)
dev_err(dev, "can't request ehci vbus gpio %d", gpio);
}
static u64 ehci_s5p_dma_mask = DMA_BIT_MASK(32);
static int s5p_ehci_probe(struct platform_device *pdev)
{
struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
struct s5p_ehci_hcd *s5p_ehci;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct resource *res;
struct usb_phy *phy;
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.
*/
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &ehci_s5p_dma_mask;
if (!pdev->dev.coherent_dma_mask)
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
s5p_setup_vbus_gpio(pdev);
hcd = usb_create_hcd(&s5p_ehci_hc_driver,
&pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
dev_err(&pdev->dev, "Unable to create HCD\n");
return -ENOMEM;
}
s5p_ehci = to_s5p_ehci(hcd);
phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
if (IS_ERR(phy)) {
/* Fallback to pdata */
if (!pdata) {
dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
return -EPROBE_DEFER;
} else {
s5p_ehci->pdata = pdata;
}
} else {
s5p_ehci->phy = phy;
s5p_ehci->otg = phy->otg;
}
s5p_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
if (IS_ERR(s5p_ehci->clk)) {
dev_err(&pdev->dev, "Failed to get usbhost clock\n");
err = PTR_ERR(s5p_ehci->clk);
goto fail_clk;
}
err = clk_prepare_enable(s5p_ehci->clk);
if (err)
goto fail_clk;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Failed to get I/O memory\n");
err = -ENXIO;
goto fail_io;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
if (!hcd->regs) {
dev_err(&pdev->dev, "Failed to remap I/O memory\n");
err = -ENOMEM;
goto fail_io;
}
irq = platform_get_irq(pdev, 0);
if (!irq) {
dev_err(&pdev->dev, "Failed to get IRQ\n");
err = -ENODEV;
goto fail_io;
}
if (s5p_ehci->otg)
s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
if (s5p_ehci->phy)
usb_phy_init(s5p_ehci->phy);
else if (s5p_ehci->pdata->phy_init)
s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
ehci = hcd_to_ehci(hcd);
ehci->caps = hcd->regs;
/* DMA burst Enable */
writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
err = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (err) {
dev_err(&pdev->dev, "Failed to add USB HCD\n");
goto fail_add_hcd;
}
platform_set_drvdata(pdev, hcd);
return 0;
fail_add_hcd:
if (s5p_ehci->phy)
usb_phy_shutdown(s5p_ehci->phy);
else if (s5p_ehci->pdata->phy_exit)
s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
fail_io:
clk_disable_unprepare(s5p_ehci->clk);
fail_clk:
usb_put_hcd(hcd);
return err;
}
static int s5p_ehci_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
usb_remove_hcd(hcd);
if (s5p_ehci->otg)
s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
if (s5p_ehci->phy)
usb_phy_shutdown(s5p_ehci->phy);
else if (s5p_ehci->pdata->phy_exit)
s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
clk_disable_unprepare(s5p_ehci->clk);
usb_put_hcd(hcd);
return 0;
}
static void s5p_ehci_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 s5p_ehci_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
struct platform_device *pdev = to_platform_device(dev);
bool do_wakeup = device_may_wakeup(dev);
int rc;
rc = ehci_suspend(hcd, do_wakeup);
if (s5p_ehci->otg)
s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
if (s5p_ehci->phy)
usb_phy_shutdown(s5p_ehci->phy);
else if (s5p_ehci->pdata->phy_exit)
s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
clk_disable_unprepare(s5p_ehci->clk);
return rc;
}
static int s5p_ehci_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
struct platform_device *pdev = to_platform_device(dev);
clk_prepare_enable(s5p_ehci->clk);
if (s5p_ehci->otg)
s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
if (s5p_ehci->phy)
usb_phy_init(s5p_ehci->phy);
else if (s5p_ehci->pdata->phy_init)
s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
/* DMA burst Enable */
writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
ehci_resume(hcd, false);
return 0;
}
#else
#define s5p_ehci_suspend NULL
#define s5p_ehci_resume NULL
#endif
static const struct dev_pm_ops s5p_ehci_pm_ops = {
.suspend = s5p_ehci_suspend,
.resume = s5p_ehci_resume,
};
#ifdef CONFIG_OF
static const struct of_device_id exynos_ehci_match[] = {
{ .compatible = "samsung,exynos4210-ehci" },
{},
};
MODULE_DEVICE_TABLE(of, exynos_ehci_match);
#endif
static struct platform_driver s5p_ehci_driver = {
.probe = s5p_ehci_probe,
.remove = s5p_ehci_remove,
.shutdown = s5p_ehci_shutdown,
.driver = {
.name = "s5p-ehci",
.owner = THIS_MODULE,
.pm = &s5p_ehci_pm_ops,
.of_match_table = of_match_ptr(exynos_ehci_match),
}
};
static const struct ehci_driver_overrides s5p_overrides __initdata = {
.extra_priv_size = sizeof(struct s5p_ehci_hcd),
};
static int __init ehci_s5p_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ehci_init_driver(&s5p_ehci_hc_driver, &s5p_overrides);
return platform_driver_register(&s5p_ehci_driver);
}
module_init(ehci_s5p_init);
static void __exit ehci_s5p_cleanup(void)
{
platform_driver_unregister(&s5p_ehci_driver);
}
module_exit(ehci_s5p_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:s5p-ehci");
MODULE_AUTHOR("Jingoo Han");
MODULE_AUTHOR("Joonyoung Shim");
MODULE_LICENSE("GPL v2");
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