drivers/usb/host/ohci-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 OHCI 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_ohc(void)
  30 {
  31 }
  32
  33 static void tilegx_stop_ohc(void)
  34 {
  35 }
  36
  37 static int tilegx_ohci_start(struct usb_hcd *hcd)
  38 {
  39         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  40         int ret;
  41
  42         ret = ohci_init(ohci);
  43         if (ret < 0)
  44                 return ret;
  45
  46         ret = ohci_run(ohci);
  47         if (ret < 0) {
  48                 dev_err(hcd->self.controller, "can't start %s\n",
  49                         hcd->self.bus_name);
  50                 ohci_stop(hcd);
  51                 return ret;
  52         }
  53
  54         return 0;
  55 }
  56
  57 static const struct hc_driver ohci_tilegx_hc_driver = {
  58         .description            = hcd_name,
  59         .product_desc           = "Tile-Gx OHCI",
  60         .hcd_priv_size          = sizeof(struct ohci_hcd),
  61
  62         /*
  63          * Generic hardware linkage.
  64          */
  65         .irq                    = ohci_irq,
  66         .flags                  = HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11,
  67
  68         /*
  69          * Basic lifecycle operations.
  70          */
  71         .start                  = tilegx_ohci_start,
  72         .stop                   = ohci_stop,
  73         .shutdown               = ohci_shutdown,
  74
  75         /*
  76          * Managing I/O requests and associated device resources.
  77          */
  78         .urb_enqueue            = ohci_urb_enqueue,
  79         .urb_dequeue            = ohci_urb_dequeue,
  80         .endpoint_disable       = ohci_endpoint_disable,
  81
  82         /*
  83          * Scheduling support.
  84          */
  85         .get_frame_number       = ohci_get_frame,
  86
  87         /*
  88          * Root hub support.
  89          */
  90         .hub_status_data        = ohci_hub_status_data,
  91         .hub_control            = ohci_hub_control,
  92         .start_port_reset       = ohci_start_port_reset,
  93 };
  94
  95 static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev)
  96 {
  97         struct usb_hcd *hcd;
  98         struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
  99         pte_t pte = { 0 };
 100         int my_cpu = smp_processor_id();
 101         int ret;
 102
 103         if (usb_disabled())
 104                 return -ENODEV;
 105
 106         /*
 107          * Try to initialize our GXIO context; if we can't, the device
 108          * doesn't exist.
 109          */
 110         if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 0) != 0)
 111                 return -ENXIO;
 112
 113         hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev,
 114                              dev_name(&pdev->dev));
 115         if (!hcd)
 116                 return -ENOMEM;
 117
 118         /*
 119          * We don't use rsrc_start to map in our registers, but seems like
 120          * we ought to set it to something, so we use the register VA.
 121          */
 122         hcd->rsrc_start =
 123                 (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
 124         hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
 125         hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
 126
 127         tilegx_start_ohc();
 128
 129         /* Create our IRQs and register them. */
 130         pdata->irq = create_irq();
 131         if (pdata->irq < 0) {
 132                 ret = -ENXIO;
 133                 goto err_no_irq;
 134         }
 135
 136         tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
 137
 138         /* Configure interrupts. */
 139         ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
 140                                           cpu_x(my_cpu), cpu_y(my_cpu),
 141                                           KERNEL_PL, pdata->irq);
 142         if (ret) {
 143                 ret = -ENXIO;
 144                 goto err_have_irq;
 145         }
 146
 147         /* Register all of our memory. */
 148         pte = pte_set_home(pte, PAGE_HOME_HASH);
 149         ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
 150         if (ret) {
 151                 ret = -ENXIO;
 152                 goto err_have_irq;
 153         }
 154
 155         ohci_hcd_init(hcd_to_ohci(hcd));
 156
 157         ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
 158         if (ret == 0) {
 159                 platform_set_drvdata(pdev, hcd);
 160                 return ret;
 161         }
 162
 163 err_have_irq:
 164         destroy_irq(pdata->irq);
 165 err_no_irq:
 166         tilegx_stop_ohc();
 167         usb_put_hcd(hcd);
 168         gxio_usb_host_destroy(&pdata->usb_ctx);
 169         return ret;
 170 }
 171
 172 static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev)
 173 {
 174         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 175         struct tilegx_usb_platform_data* pdata = pdev->dev.platform_data;
 176
 177         usb_remove_hcd(hcd);
 178         usb_put_hcd(hcd);
 179         tilegx_stop_ohc();
 180         gxio_usb_host_destroy(&pdata->usb_ctx);
 181         destroy_irq(pdata->irq);
 182         platform_set_drvdata(pdev, NULL);
 183
 184         return 0;
 185 }
 186
 187 static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
 188 {
 189         usb_hcd_platform_shutdown(pdev);
 190         ohci_hcd_tilegx_drv_remove(pdev);
 191 }
 192
 193 static struct platform_driver ohci_hcd_tilegx_driver = {
 194         .probe          = ohci_hcd_tilegx_drv_probe,
 195         .remove         = ohci_hcd_tilegx_drv_remove,
 196         .shutdown       = ohci_hcd_tilegx_drv_shutdown,
 197         .driver = {
 198                 .name   = "tilegx-ohci",
 199                 .owner  = THIS_MODULE,
 200         }
 201 };
 202
 203 MODULE_ALIAS("platform:tilegx-ohci");