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linux-next/drivers/usb/host/xhci-plat.c
Yoshihiro Shimoda 4ac8918f3a usb: host: xhci-plat: add support for the R-Car H2 and M2 xHCI controllers 
The R-Car H2 and M2 SoCs come with an xHCI controller that requires
some specific initializations related to the firmware downloading and
some specific registers. This patch adds the support for this special
configuration as an xHCI quirk executed during probe and start.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: "mathias.nyman@intel.com" <mathias.nyman@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-09 15:49:10 -07:00

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/*
* xhci-plat.c - xHCI host controller driver platform Bus Glue.
*
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
* Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*
* A lot of code borrowed from the Linux xHCI driver.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/usb/xhci_pdriver.h>
#include "xhci.h"
#include "xhci-mvebu.h"
#include "xhci-rcar.h"
static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
{
/*
* As of now platform drivers don't provide MSI support so we ensure
* here that the generic code does not try to make a pci_dev from our
* dev struct in order to setup MSI
*/
xhci->quirks |= XHCI_PLAT;
}
/* called during probe() after chip reset completes */
static int xhci_plat_setup(struct usb_hcd *hcd)
{
struct device_node *of_node = hcd->self.controller->of_node;
int ret;
if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) {
ret = xhci_rcar_init_quirk(hcd);
if (ret)
return ret;
}
return xhci_gen_setup(hcd, xhci_plat_quirks);
}
static int xhci_plat_start(struct usb_hcd *hcd)
{
struct device_node *of_node = hcd->self.controller->of_node;
if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
of_device_is_compatible(of_node, "renesas,xhci-r8a7791"))
xhci_rcar_start(hcd);
return xhci_run(hcd);
}
static const struct hc_driver xhci_plat_xhci_driver = {
.description = "xhci-hcd",
.product_desc = "xHCI Host Controller",
.hcd_priv_size = sizeof(struct xhci_hcd *),
/*
* generic hardware linkage
*/
.irq = xhci_irq,
.flags = HCD_MEMORY | HCD_USB3 | HCD_SHARED,
/*
* basic lifecycle operations
*/
.reset = xhci_plat_setup,
.start = xhci_plat_start,
.stop = xhci_stop,
.shutdown = xhci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = xhci_urb_enqueue,
.urb_dequeue = xhci_urb_dequeue,
.alloc_dev = xhci_alloc_dev,
.free_dev = xhci_free_dev,
.alloc_streams = xhci_alloc_streams,
.free_streams = xhci_free_streams,
.add_endpoint = xhci_add_endpoint,
.drop_endpoint = xhci_drop_endpoint,
.endpoint_reset = xhci_endpoint_reset,
.check_bandwidth = xhci_check_bandwidth,
.reset_bandwidth = xhci_reset_bandwidth,
.address_device = xhci_address_device,
.enable_device = xhci_enable_device,
.update_hub_device = xhci_update_hub_device,
.reset_device = xhci_discover_or_reset_device,
/*
* scheduling support
*/
.get_frame_number = xhci_get_frame,
/* Root hub support */
.hub_control = xhci_hub_control,
.hub_status_data = xhci_hub_status_data,
.bus_suspend = xhci_bus_suspend,
.bus_resume = xhci_bus_resume,
.enable_usb3_lpm_timeout = xhci_enable_usb3_lpm_timeout,
.disable_usb3_lpm_timeout = xhci_disable_usb3_lpm_timeout,
};
static int xhci_plat_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct usb_xhci_pdata *pdata = dev_get_platdata(&pdev->dev);
const struct hc_driver *driver;
struct xhci_hcd *xhci;
struct resource *res;
struct usb_hcd *hcd;
struct clk *clk;
int ret;
int irq;
if (usb_disabled())
return -ENODEV;
driver = &xhci_plat_xhci_driver;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
if (of_device_is_compatible(pdev->dev.of_node,
"marvell,armada-375-xhci") ||
of_device_is_compatible(pdev->dev.of_node,
"marvell,armada-380-xhci")) {
ret = xhci_mvebu_mbus_init_quirk(pdev);
if (ret)
return ret;
}
/* Initialize dma_mask and coherent_dma_mask to 32-bits */
ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
else
dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
hcd->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(hcd->regs)) {
ret = PTR_ERR(hcd->regs);
goto put_hcd;
}
/*
* Not all platforms have a clk so it is not an error if the
* clock does not exists.
*/
clk = devm_clk_get(&pdev->dev, NULL);
if (!IS_ERR(clk)) {
ret = clk_prepare_enable(clk);
if (ret)
goto put_hcd;
}
ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (ret)
goto disable_clk;
device_wakeup_enable(hcd->self.controller);
/* USB 2.0 roothub is stored in the platform_device now. */
hcd = platform_get_drvdata(pdev);
xhci = hcd_to_xhci(hcd);
xhci->clk = clk;
xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
dev_name(&pdev->dev), hcd);
if (!xhci->shared_hcd) {
ret = -ENOMEM;
goto dealloc_usb2_hcd;
}
if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
(pdata && pdata->usb3_lpm_capable))
xhci->quirks |= XHCI_LPM_SUPPORT;
/*
* Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
* is called by usb_add_hcd().
*/
*((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
xhci->shared_hcd->can_do_streams = 1;
ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
if (ret)
goto put_usb3_hcd;
return 0;
put_usb3_hcd:
usb_put_hcd(xhci->shared_hcd);
dealloc_usb2_hcd:
usb_remove_hcd(hcd);
disable_clk:
if (!IS_ERR(clk))
clk_disable_unprepare(clk);
put_hcd:
usb_put_hcd(hcd);
return ret;
}
static int xhci_plat_remove(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct clk *clk = xhci->clk;
usb_remove_hcd(xhci->shared_hcd);
usb_put_hcd(xhci->shared_hcd);
usb_remove_hcd(hcd);
if (!IS_ERR(clk))
clk_disable_unprepare(clk);
usb_put_hcd(hcd);
kfree(xhci);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int xhci_plat_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
return xhci_suspend(xhci);
}
static int xhci_plat_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
return xhci_resume(xhci, 0);
}
static const struct dev_pm_ops xhci_plat_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
};
#define DEV_PM_OPS (&xhci_plat_pm_ops)
#else
#define DEV_PM_OPS NULL
#endif /* CONFIG_PM */
#ifdef CONFIG_OF
static const struct of_device_id usb_xhci_of_match[] = {
{ .compatible = "generic-xhci" },
{ .compatible = "xhci-platform" },
{ .compatible = "marvell,armada-375-xhci"},
{ .compatible = "marvell,armada-380-xhci"},
{ .compatible = "renesas,xhci-r8a7790"},
{ .compatible = "renesas,xhci-r8a7791"},
{ },
};
MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
#endif
static struct platform_driver usb_xhci_driver = {
.probe = xhci_plat_probe,
.remove = xhci_plat_remove,
.driver = {
.name = "xhci-hcd",
.pm = DEV_PM_OPS,
.of_match_table = of_match_ptr(usb_xhci_of_match),
},
};
MODULE_ALIAS("platform:xhci-hcd");
int xhci_register_plat(void)
{
return platform_driver_register(&usb_xhci_driver);
}
void xhci_unregister_plat(void)
{
platform_driver_unregister(&usb_xhci_driver);
}
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