usb: add host support for the tilegx architecture
This change adds OHCI and EHCI support for the tilegx's on-chip USB hardware. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
203
drivers/usb/host/ohci-tilegx.c
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203
drivers/usb/host/ohci-tilegx.c
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/*
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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 OHCI 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_ohc(void)
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{
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}
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static void tilegx_stop_ohc(void)
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{
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}
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static int tilegx_ohci_start(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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int ret;
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ret = ohci_init(ohci);
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if (ret < 0)
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return ret;
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ret = ohci_run(ohci);
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if (ret < 0) {
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dev_err(hcd->self.controller, "can't start %s\n",
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hcd->self.bus_name);
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ohci_stop(hcd);
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return ret;
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}
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return 0;
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}
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static const struct hc_driver ohci_tilegx_hc_driver = {
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.description = hcd_name,
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.product_desc = "Tile-Gx OHCI",
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.hcd_priv_size = sizeof(struct ohci_hcd),
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/*
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* Generic hardware linkage.
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*/
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.irq = ohci_irq,
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.flags = HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11,
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/*
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* Basic lifecycle operations.
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*/
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.start = tilegx_ohci_start,
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.stop = ohci_stop,
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.shutdown = ohci_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 = ohci_urb_enqueue,
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.urb_dequeue = ohci_urb_dequeue,
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.endpoint_disable = ohci_endpoint_disable,
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/*
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* Scheduling support.
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*/
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.get_frame_number = ohci_get_frame,
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/*
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* Root hub support.
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*/
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.hub_status_data = ohci_hub_status_data,
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.hub_control = ohci_hub_control,
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.start_port_reset = ohci_start_port_reset,
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};
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static int ohci_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 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, 0) != 0)
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return -ENXIO;
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hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev,
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dev_name(&pdev->dev));
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if (!hcd)
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return -ENOMEM;
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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_ohc();
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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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ohci_hcd_init(hcd_to_ohci(hcd));
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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_ohc();
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usb_put_hcd(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 ohci_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_ohc();
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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 ohci_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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ohci_hcd_tilegx_drv_remove(pdev);
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}
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static struct platform_driver ohci_hcd_tilegx_driver = {
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.probe = ohci_hcd_tilegx_drv_probe,
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.remove = ohci_hcd_tilegx_drv_remove,
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.shutdown = ohci_hcd_tilegx_drv_shutdown,
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.driver = {
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.name = "tilegx-ohci",
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.owner = THIS_MODULE,
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}
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};
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MODULE_ALIAS("platform:tilegx-ohci");
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