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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>
#define CAPLENGTH_MASK (0xff)
struct ehci_hcd_mv {
struct usb_hcd *hcd;
/* Which mode does this ehci running OTG/Host ? */
int mode;
void __iomem *phy_regs;
void __iomem *cap_regs;
void __iomem *op_regs;
struct usb_phy *otg;
struct mv_usb_platform_data *pdata;
struct clk *clk;
};
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)
{
int retval;
ehci_clock_enable(ehci_mv);
if (ehci_mv->pdata->phy_init) {
retval = ehci_mv->pdata->phy_init(ehci_mv->phy_regs);
if (retval)
return retval;
}
return 0;
}
static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
{
if (ehci_mv->pdata->phy_deinit)
ehci_mv->pdata->phy_deinit(ehci_mv->phy_regs);
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 = dev_get_drvdata(dev);
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 const struct hc_driver mv_ehci_hc_driver = {
.description = hcd_name,
.product_desc = "Marvell EHCI",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
/*
* basic lifecycle operations
*/
.reset = mv_ehci_reset,
.start = ehci_run,
.stop = ehci_stop,
.shutdown = ehci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
/*
* scheduling support
*/
.get_frame_number = ehci_get_frame,
/*
* root hub support
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
};
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 (!pdata) {
dev_err(&pdev->dev, "missing platform_data\n");
return -ENODEV;
}
if (usb_disabled())
return -ENODEV;
hcd = usb_create_hcd(&mv_ehci_hc_driver, &pdev->dev, "mv ehci");
if (!hcd)
return -ENOMEM;
ehci_mv = devm_kzalloc(&pdev->dev, sizeof(*ehci_mv), GFP_KERNEL);
if (ehci_mv == NULL) {
retval = -ENOMEM;
goto err_put_hcd;
}
platform_set_drvdata(pdev, ehci_mv);
ehci_mv->pdata = pdata;
ehci_mv->hcd = 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_byname(pdev, IORESOURCE_MEM, "phyregs");
ehci_mv->phy_regs = devm_ioremap_resource(&pdev->dev, r);
if (IS_ERR(ehci_mv->phy_regs)) {
retval = PTR_ERR(ehci_mv->phy_regs);
goto err_put_hcd;
}
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "capregs");
ehci_mv->cap_regs = devm_ioremap_resource(&pdev->dev, r);
if (IS_ERR(ehci_mv->cap_regs)) {
retval = PTR_ERR(ehci_mv->cap_regs);
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;
}
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;
ehci_mv->mode = pdata->mode;
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 (pdata->set_vbus)
pdata->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);
}
if (pdata->private_init)
pdata->private_init(ehci_mv->op_regs, ehci_mv->phy_regs);
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 (pdata->set_vbus)
pdata->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 ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
struct usb_hcd *hcd = ehci_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->pdata->set_vbus)
ehci_mv->pdata->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 ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
struct usb_hcd *hcd = ehci_mv->hcd;
if (!hcd->rh_registered)
return;
if (hcd->driver->shutdown)
hcd->driver->shutdown(hcd);
}
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,
},
.id_table = ehci_id_table,
};
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