diff options
Diffstat (limited to 'drivers/usb/host/ohci-tilegx.c')
| -rw-r--r-- | drivers/usb/host/ohci-tilegx.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-tilegx.c b/drivers/usb/host/ohci-tilegx.c new file mode 100644 index 000000000..e1b208da4 --- /dev/null +++ b/drivers/usb/host/ohci-tilegx.c @@ -0,0 +1,205 @@ +/* + * 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 OHCI 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_ohc(void) +{ +} + +static void tilegx_stop_ohc(void) +{ +} + +static int tilegx_ohci_start(struct usb_hcd *hcd) +{ + struct ohci_hcd *ohci = hcd_to_ohci(hcd); + int ret; + + ret = ohci_init(ohci); + if (ret < 0) + return ret; + + ret = ohci_run(ohci); + if (ret < 0) { + dev_err(hcd->self.controller, "can't start %s\n", + hcd->self.bus_name); + ohci_stop(hcd); + return ret; + } + + return 0; +} + +static const struct hc_driver ohci_tilegx_hc_driver = { + .description = hcd_name, + .product_desc = "Tile-Gx OHCI", + .hcd_priv_size = sizeof(struct ohci_hcd), + + /* + * Generic hardware linkage. + */ + .irq = ohci_irq, + .flags = HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11, + + /* + * Basic lifecycle operations. + */ + .start = tilegx_ohci_start, + .stop = ohci_stop, + .shutdown = ohci_shutdown, + + /* + * Managing I/O requests and associated device resources. + */ + .urb_enqueue = ohci_urb_enqueue, + .urb_dequeue = ohci_urb_dequeue, + .endpoint_disable = ohci_endpoint_disable, + + /* + * Scheduling support. + */ + .get_frame_number = ohci_get_frame, + + /* + * Root hub support. + */ + .hub_status_data = ohci_hub_status_data, + .hub_control = ohci_hub_control, + .start_port_reset = ohci_start_port_reset, +}; + +static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev) +{ + struct usb_hcd *hcd; + struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); + 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, 0) != 0) + return -ENXIO; + + hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev, + dev_name(&pdev->dev)); + if (!hcd) { + ret = -ENOMEM; + goto err_hcd; + } + + /* + * 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_ohc(); + + /* Create our IRQs and register them. */ + pdata->irq = irq_alloc_hwirq(-1); + if (!pdata->irq) { + 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; + } + + ohci_hcd_init(hcd_to_ohci(hcd)); + + ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED); + if (ret == 0) { + platform_set_drvdata(pdev, hcd); + device_wakeup_enable(hcd->self.controller); + return ret; + } + +err_have_irq: + irq_free_hwirq(pdata->irq); +err_no_irq: + tilegx_stop_ohc(); + usb_put_hcd(hcd); +err_hcd: + gxio_usb_host_destroy(&pdata->usb_ctx); + return ret; +} + +static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev) +{ + struct usb_hcd *hcd = platform_get_drvdata(pdev); + struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); + + usb_remove_hcd(hcd); + usb_put_hcd(hcd); + tilegx_stop_ohc(); + gxio_usb_host_destroy(&pdata->usb_ctx); + irq_free_hwirq(pdata->irq); + + return 0; +} + +static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev) +{ + usb_hcd_platform_shutdown(pdev); + ohci_hcd_tilegx_drv_remove(pdev); +} + +static struct platform_driver ohci_hcd_tilegx_driver = { + .probe = ohci_hcd_tilegx_drv_probe, + .remove = ohci_hcd_tilegx_drv_remove, + .shutdown = ohci_hcd_tilegx_drv_shutdown, + .driver = { + .name = "tilegx-ohci", + } +}; + +MODULE_ALIAS("platform:tilegx-ohci"); |