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