drivers/usb/host/ehci-tilegx.c

   1 /*
   2  * Copyright 2012 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 /*
  16  * Tilera TILE-Gx USB EHCI host controller driver.
  17  */
  18
  19 #include <linux/irq.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/usb/tilegx.h>
  22 #include <linux/usb.h>
  23
  24 #include <asm/homecache.h>
  25
  26 #include <gxio/iorpc_usb_host.h>
  27 #include <gxio/usb_host.h>
  28
  29 static void tilegx_start_ehc(void)
  30 {
  31 }
  32
  33 static void tilegx_stop_ehc(void)
  34 {
  35 }
  36
  37 static int tilegx_ehci_setup(struct usb_hcd *hcd)
  38 {
  39         int ret = ehci_init(hcd);
  40
  41         /*
  42          * Some drivers do:
  43          *
  44          *   struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  45          *   ehci->need_io_watchdog = 0;
  46          *
  47          * here, but since this is a new driver we're going to leave the
  48          * watchdog enabled.  Later we may try to turn it off and see
  49          * whether we run into any problems.
  50          */
  51
  52         return ret;
  53 }
  54
  55 static const struct hc_driver ehci_tilegx_hc_driver = {
  56         .description            = hcd_name,
  57         .product_desc           = "Tile-Gx EHCI",
  58         .hcd_priv_size          = sizeof(struct ehci_hcd),
  59
  60         /*
  61          * Generic hardware linkage.
  62          */
  63         .irq                    = ehci_irq,
  64         .flags                  = HCD_MEMORY | HCD_USB2,
  65
  66         /*
  67          * Basic lifecycle operations.
  68          */
  69         .reset                  = tilegx_ehci_setup,
  70         .start                  = ehci_run,
  71         .stop                   = ehci_stop,
  72         .shutdown               = ehci_shutdown,
  73
  74         /*
  75          * Managing I/O requests and associated device resources.
  76          */
  77         .urb_enqueue            = ehci_urb_enqueue,
  78         .urb_dequeue            = ehci_urb_dequeue,
  79         .endpoint_disable       = ehci_endpoint_disable,
  80         .endpoint_reset         = ehci_endpoint_reset,
  81
  82         /*
  83          * Scheduling support.
  84          */
  85         .get_frame_number       = ehci_get_frame,
  86
  87         /*
  88          * Root hub support.
  89          */
  90         .hub_status_data        = ehci_hub_status_data,
  91         .hub_control            = ehci_hub_control,
  92         .bus_suspend            = ehci_bus_suspend,
  93         .bus_resume             = ehci_bus_resume,
  94         .relinquish_port        = ehci_relinquish_port,
  95         .port_handed_over       = ehci_port_handed_over,
  96
  97         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  98 };
  99
 100 static int ehci_hcd_tilegx_drv_probe(struct platform_device *pdev)
 101 {
 102         struct usb_hcd *hcd;
 103         struct ehci_hcd *ehci;
 104         struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
 105         pte_t pte = { 0 };
 106         int my_cpu = smp_processor_id();
 107         int ret;
 108
 109         if (usb_disabled())
 110                 return -ENODEV;
 111
 112         /*
 113          * Try to initialize our GXIO context; if we can't, the device
 114          * doesn't exist.
 115          */
 116         if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 1) != 0)
 117                 return -ENXIO;
 118
 119         hcd = usb_create_hcd(&ehci_tilegx_hc_driver, &pdev->dev,
 120                              dev_name(&pdev->dev));
 121         if (!hcd) {
 122           ret = -ENOMEM;
 123           goto err_hcd;
 124         }
 125
 126         /*
 127          * We don't use rsrc_start to map in our registers, but seems like
 128          * we ought to set it to something, so we use the register VA.
 129          */
 130         hcd->rsrc_start =
 131                 (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
 132         hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
 133         hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
 134
 135         tilegx_start_ehc();
 136
 137         ehci = hcd_to_ehci(hcd);
 138         ehci->caps = hcd->regs;
 139         ehci->regs =
 140                 hcd->regs + HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
 141         /* cache this readonly data; minimize chip reads */
 142         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 143
 144         /* Create our IRQs and register them. */
 145         pdata->irq = create_irq();
 146         if (pdata->irq < 0) {
 147                 ret = -ENXIO;
 148                 goto err_no_irq;
 149         }
 150
 151         tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
 152
 153         /* Configure interrupts. */
 154         ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
 155                                           cpu_x(my_cpu), cpu_y(my_cpu),
 156                                           KERNEL_PL, pdata->irq);
 157         if (ret) {
 158                 ret = -ENXIO;
 159                 goto err_have_irq;
 160         }
 161
 162         /* Register all of our memory. */
 163         pte = pte_set_home(pte, PAGE_HOME_HASH);
 164         ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
 165         if (ret) {
 166                 ret = -ENXIO;
 167                 goto err_have_irq;
 168         }
 169
 170         ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
 171         if (ret == 0) {
 172                 platform_set_drvdata(pdev, hcd);
 173                 return ret;
 174         }
 175
 176 err_have_irq:
 177         destroy_irq(pdata->irq);
 178 err_no_irq:
 179         tilegx_stop_ehc();
 180         usb_put_hcd(hcd);
 181 err_hcd:
 182         gxio_usb_host_destroy(&pdata->usb_ctx);
 183         return ret;
 184 }
 185
 186 static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)
 187 {
 188         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 189         struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
 190
 191         usb_remove_hcd(hcd);
 192         usb_put_hcd(hcd);
 193         tilegx_stop_ehc();
 194         gxio_usb_host_destroy(&pdata->usb_ctx);
 195         destroy_irq(pdata->irq);
 196         platform_set_drvdata(pdev, NULL);
 197
 198         return 0;
 199 }
 200
 201 static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
 202 {
 203         usb_hcd_platform_shutdown(pdev);
 204         ehci_hcd_tilegx_drv_remove(pdev);
 205 }
 206
 207 static struct platform_driver ehci_hcd_tilegx_driver = {
 208         .probe          = ehci_hcd_tilegx_drv_probe,
 209         .remove         = ehci_hcd_tilegx_drv_remove,
 210         .shutdown       = ehci_hcd_tilegx_drv_shutdown,
 211         .driver = {
 212                 .name   = "tilegx-ehci",
 213                 .owner  = THIS_MODULE,
 214         }
 215 };
 216
 217 MODULE_ALIAS("platform:tilegx-ehci");