/*
* Copyright 2012 Tilera Corporation. All Rights Reserved.
*
* 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, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
/*
* Tilera TILE-Gx USB EHCI host controller driver.
*/
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/usb/tilegx.h>
#include <linux/usb.h>
#include <asm/homecache.h>
#include <gxio/iorpc_usb_host.h>
#include <gxio/usb_host.h>
static void tilegx_start_ehc(void)
{
}
static void tilegx_stop_ehc(void)
{
}
static int tilegx_ehci_setup(struct usb_hcd *hcd)
{
int ret = ehci_init(hcd);
/*
* Some drivers do:
*
* struct ehci_hcd *ehci = hcd_to_ehci(hcd);
* ehci->need_io_watchdog = 0;
*
* here, but since this is a new driver we're going to leave the
* watchdog enabled. Later we may try to turn it off and see
* whether we run into any problems.
*/
return ret;
}
static const struct hc_driver ehci_tilegx_hc_driver = {
.description = hcd_name,
.product_desc = "Tile-Gx EHCI",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* Generic hardware linkage.
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* Basic lifecycle operations.
*/
.reset = tilegx_ehci_setup,
.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,
/*
* 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,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static int ehci_hcd_tilegx_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
pte_t pte = { 0 };
int my_cpu = smp_processor_id();
int ret;
if (usb_disabled())
return -ENODEV;
/*
* Try to initialize our GXIO context; if we can't, the device
* doesn't exist.
*/
if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 1) != 0)
return -ENXIO;
hcd = usb_create_hcd(&ehci_tilegx_hc_driver, &pdev->dev,
dev_name(&pdev->dev));
if (!hcd)
return -ENOMEM;
/*
* We don't use rsrc_start to map in our registers, but seems like
* we ought to set it to something, so we use the register VA.
*/
hcd->rsrc_start =
(ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
tilegx_start_ehc();
ehci = hcd_to_ehci(hcd);
ehci->caps = hcd->regs;
ehci->regs =
hcd->regs + HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = readl(&ehci->caps->hcs_params);
/* Create our IRQs and register them. */
pdata->irq = create_irq();
if (pdata->irq < 0) {
ret = -ENXIO;
goto err_no_irq;
}
tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
/* Configure interrupts. */
ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
cpu_x(my_cpu), cpu_y(my_cpu),
KERNEL_PL, pdata->irq);
if (ret) {
ret = -ENXIO;
goto err_have_irq;
}
/* Register all of our memory. */
pte = pte_set_home(pte, PAGE_HOME_HASH);
ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
if (ret) {
ret = -ENXIO;
goto err_have_irq;
}
ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
if (ret == 0) {
platform_set_drvdata(pdev, hcd);
return ret;
}
err_have_irq:
destroy_irq(pdata->irq);
err_no_irq:
tilegx_stop_ehc();
usb_put_hcd(hcd);
gxio_usb_host_destroy(&pdata->usb_ctx);
return ret;
}
static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
usb_remove_hcd(hcd);
usb_put_hcd(hcd);
tilegx_stop_ehc();
gxio_usb_host_destroy(&pdata->usb_ctx);
destroy_irq(pdata->irq);
platform_set_drvdata(pdev, NULL);
return 0;
}
static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
{
usb_hcd_platform_shutdown(pdev);
ehci_hcd_tilegx_drv_remove(pdev);
}
static struct platform_driver ehci_hcd_tilegx_driver = {
.probe = ehci_hcd_tilegx_drv_probe,
.remove = ehci_hcd_tilegx_drv_remove,
.shutdown = ehci_hcd_tilegx_drv_shutdown,
.driver = {
.name = "tilegx-ehci",
.owner = THIS_MODULE,
}
};
MODULE_ALIAS("platform:tilegx-ehci");
