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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2011 Marvell International Ltd. All rights reserved.
* Author: Chao Xie <chao.xie@marvell.com>
* Neil Zhang <zhangwm@marvell.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/usb/otg.h>
#include <linux/platform_data/mv_usb.h>
#include <linux/io.h>
#include <linux/usb/hcd.h>
#include "ehci.h"
/* registers */
#define U2x_CAPREGS_OFFSET 0x100
#define CAPLENGTH_MASK (0xff)
#define hcd_to_ehci_hcd_mv(h) ((struct ehci_hcd_mv *)hcd_to_ehci(h)->priv)
struct ehci_hcd_mv {
/* Which mode does this ehci running OTG/Host ? */
int mode;
void __iomem *base;
void __iomem *cap_regs;
void __iomem *op_regs;
struct usb_phy *otg;
struct clk *clk;
struct phy *phy;
int (*set_vbus)(unsigned int vbus);
};
static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
{
clk_prepare_enable(ehci_mv->clk);
}
static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
{
clk_disable_unprepare(ehci_mv->clk);
}
static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
{
ehci_clock_enable(ehci_mv);
return phy_init(ehci_mv->phy);
}
static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
{
phy_exit(ehci_mv->phy);
ehci_clock_disable(ehci_mv);
}
static int mv_ehci_reset(struct usb_hcd *hcd)
{
struct device *dev = hcd->self.controller;
struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
int retval;
if (ehci_mv == NULL) {
dev_err(dev, "Can not find private ehci data\n");
return -ENODEV;
}
hcd->has_tt = 1;
retval = ehci_setup(hcd);
if (retval)
dev_err(dev, "ehci_setup failed %d\n", retval);
return retval;
}
static struct hc_driver __read_mostly ehci_platform_hc_driver;
static const struct ehci_driver_overrides platform_overrides __initconst = {
.reset = mv_ehci_reset,
.extra_priv_size = sizeof(struct ehci_hcd_mv),
};
static int mv_ehci_probe(struct platform_device *pdev)
{
struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct ehci_hcd_mv *ehci_mv;
struct resource *r;
int retval = -ENODEV;
u32 offset;
if (usb_disabled())
return -ENODEV;
hcd = usb_create_hcd(&ehci_platform_hc_driver, &pdev->dev, "mv ehci");
if (!hcd)
return -ENOMEM;
platform_set_drvdata(pdev, hcd);
ehci_mv = hcd_to_ehci_hcd_mv(hcd);
ehci_mv->mode = MV_USB_MODE_HOST;
if (pdata) {
ehci_mv->mode = pdata->mode;
ehci_mv->set_vbus = pdata->set_vbus;
}
ehci_mv->phy = devm_phy_get(&pdev->dev, "usb");
if (IS_ERR(ehci_mv->phy)) {
retval = PTR_ERR(ehci_mv->phy);
if (retval != -EPROBE_DEFER)
dev_err(&pdev->dev, "Failed to get phy.\n");
goto err_put_hcd;
}
ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(ehci_mv->clk)) {
dev_err(&pdev->dev, "error getting clock\n");
retval = PTR_ERR(ehci_mv->clk);
goto err_put_hcd;
}
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ehci_mv->base = devm_ioremap_resource(&pdev->dev, r);
if (IS_ERR(ehci_mv->base)) {
retval = PTR_ERR(ehci_mv->base);
goto err_put_hcd;
}
retval = mv_ehci_enable(ehci_mv);
if (retval) {
dev_err(&pdev->dev, "init phy error %d\n", retval);
goto err_put_hcd;
}
ehci_mv->cap_regs =
(void __iomem *) ((unsigned long) ehci_mv->base + U2x_CAPREGS_OFFSET);
offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
ehci_mv->op_regs =
(void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
hcd->rsrc_start = r->start;
hcd->rsrc_len = resource_size(r);
hcd->regs = ehci_mv->op_regs;
hcd->irq = platform_get_irq(pdev, 0);
if (!hcd->irq) {
dev_err(&pdev->dev, "Cannot get irq.");
retval = -ENODEV;
goto err_disable_clk;
}
ehci = hcd_to_ehci(hcd);
ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;
if (ehci_mv->mode == MV_USB_MODE_OTG) {
ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
if (IS_ERR(ehci_mv->otg)) {
retval = PTR_ERR(ehci_mv->otg);
if (retval == -ENXIO)
dev_info(&pdev->dev, "MV_USB_MODE_OTG "
"must have CONFIG_USB_PHY enabled\n");
else
dev_err(&pdev->dev,
"unable to find transceiver\n");
goto err_disable_clk;
}
retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
if (retval < 0) {
dev_err(&pdev->dev,
"unable to register with transceiver\n");
retval = -ENODEV;
goto err_disable_clk;
}
/* otg will enable clock before use as host */
mv_ehci_disable(ehci_mv);
} else {
if (ehci_mv->set_vbus)
ehci_mv->set_vbus(1);
retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
if (retval) {
dev_err(&pdev->dev,
"failed to add hcd with err %d\n", retval);
goto err_set_vbus;
}
device_wakeup_enable(hcd->self.controller);
}
dev_info(&pdev->dev,
"successful find EHCI device with regs 0x%p irq %d"
" working in %s mode\n", hcd->regs, hcd->irq,
ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
return 0;
err_set_vbus:
if (ehci_mv->set_vbus)
ehci_mv->set_vbus(0);
err_disable_clk:
mv_ehci_disable(ehci_mv);
err_put_hcd:
usb_put_hcd(hcd);
return retval;
}
static int mv_ehci_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
if (hcd->rh_registered)
usb_remove_hcd(hcd);
if (!IS_ERR_OR_NULL(ehci_mv->otg))
otg_set_host(ehci_mv->otg->otg, NULL);
if (ehci_mv->mode == MV_USB_MODE_HOST) {
if (ehci_mv->set_vbus)
ehci_mv->set_vbus(0);
mv_ehci_disable(ehci_mv);
}
usb_put_hcd(hcd);
return 0;
}
MODULE_ALIAS("mv-ehci");
static const struct platform_device_id ehci_id_table[] = {
{"pxa-u2oehci", PXA_U2OEHCI},
{"pxa-sph", PXA_SPH},
{"mmp3-hsic", MMP3_HSIC},
{"mmp3-fsic", MMP3_FSIC},
{},
};
static void mv_ehci_shutdown(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
if (!hcd->rh_registered)
return;
if (hcd->driver->shutdown)
hcd->driver->shutdown(hcd);
}
static const struct of_device_id ehci_mv_dt_ids[] = {
{ .compatible = "marvell,pxau2o-ehci", },
{},
};
static struct platform_driver ehci_mv_driver = {
.probe = mv_ehci_probe,
.remove = mv_ehci_remove,
.shutdown = mv_ehci_shutdown,
.driver = {
.name = "mv-ehci",
.bus = &platform_bus_type,
.of_match_table = ehci_mv_dt_ids,
},
.id_table = ehci_id_table,
};
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_mv_driver);
}
module_init(ehci_platform_init);
static void __exit ehci_platform_cleanup(void)
{
platform_driver_unregister(&ehci_mv_driver);
}
module_exit(ehci_platform_cleanup);
MODULE_DESCRIPTION("Marvell EHCI driver");
MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>");
MODULE_AUTHOR("Neil Zhang <zhangwm@marvell.com>");
MODULE_ALIAS("mv-ehci");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(of, ehci_mv_dt_ids);
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