drivers/usb/host/ohci-tilegx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2012 Tilera Corporation. All Rights Reserved.
   4  */
   5
   6 /*
   7  * Tilera TILE-Gx USB OHCI host controller driver.
   8  */
   9
  10 #include <linux/irq.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/usb/tilegx.h>
  13 #include <linux/usb.h>
  14
  15 #include <asm/homecache.h>
  16
  17 #include <gxio/iorpc_usb_host.h>
  18 #include <gxio/usb_host.h>
  19
  20 static void tilegx_start_ohc(void)
  21 {
  22 }
  23
  24 static void tilegx_stop_ohc(void)
  25 {
  26 }
  27
  28 static int tilegx_ohci_start(struct usb_hcd *hcd)
  29 {
  30         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  31         int ret;
  32
  33         ret = ohci_init(ohci);
  34         if (ret < 0)
  35                 return ret;
  36
  37         ret = ohci_run(ohci);
  38         if (ret < 0) {
  39                 dev_err(hcd->self.controller, "can't start %s\n",
  40                         hcd->self.bus_name);
  41                 ohci_stop(hcd);
  42                 return ret;
  43         }
  44
  45         return 0;
  46 }
  47
  48 static const struct hc_driver ohci_tilegx_hc_driver = {
  49         .description            = hcd_name,
  50         .product_desc           = "Tile-Gx OHCI",
  51         .hcd_priv_size          = sizeof(struct ohci_hcd),
  52
  53         /*
  54          * Generic hardware linkage.
  55          */
  56         .irq                    = ohci_irq,
  57         .flags                  = HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11,
  58
  59         /*
  60          * Basic lifecycle operations.
  61          */
  62         .start                  = tilegx_ohci_start,
  63         .stop                   = ohci_stop,
  64         .shutdown               = ohci_shutdown,
  65
  66         /*
  67          * Managing I/O requests and associated device resources.
  68          */
  69         .urb_enqueue            = ohci_urb_enqueue,
  70         .urb_dequeue            = ohci_urb_dequeue,
  71         .endpoint_disable       = ohci_endpoint_disable,
  72
  73         /*
  74          * Scheduling support.
  75          */
  76         .get_frame_number       = ohci_get_frame,
  77
  78         /*
  79          * Root hub support.
  80          */
  81         .hub_status_data        = ohci_hub_status_data,
  82         .hub_control            = ohci_hub_control,
  83         .start_port_reset       = ohci_start_port_reset,
  84 };
  85
  86 static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev)
  87 {
  88         struct usb_hcd *hcd;
  89         struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
  90         pte_t pte = { 0 };
  91         int my_cpu = smp_processor_id();
  92         int ret;
  93
  94         if (usb_disabled())
  95                 return -ENODEV;
  96
  97         /*
  98          * Try to initialize our GXIO context; if we can't, the device
  99          * doesn't exist.
 100          */
 101         if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 0) != 0)
 102                 return -ENXIO;
 103
 104         hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev,
 105                              dev_name(&pdev->dev));
 106         if (!hcd) {
 107                 ret = -ENOMEM;
 108                 goto err_hcd;
 109         }
 110
 111         /*
 112          * We don't use rsrc_start to map in our registers, but seems like
 113          * we ought to set it to something, so we use the register VA.
 114          */
 115         hcd->rsrc_start =
 116                 (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
 117         hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
 118         hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
 119
 120         tilegx_start_ohc();
 121
 122         /* Create our IRQs and register them. */
 123         pdata->irq = irq_alloc_hwirq(-1);
 124         if (!pdata->irq) {
 125                 ret = -ENXIO;
 126                 goto err_no_irq;
 127         }
 128
 129         tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
 130
 131         /* Configure interrupts. */
 132         ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
 133                                           cpu_x(my_cpu), cpu_y(my_cpu),
 134                                           KERNEL_PL, pdata->irq);
 135         if (ret) {
 136                 ret = -ENXIO;
 137                 goto err_have_irq;
 138         }
 139
 140         /* Register all of our memory. */
 141         pte = pte_set_home(pte, PAGE_HOME_HASH);
 142         ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
 143         if (ret) {
 144                 ret = -ENXIO;
 145                 goto err_have_irq;
 146         }
 147
 148         ohci_hcd_init(hcd_to_ohci(hcd));
 149
 150         ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
 151         if (ret == 0) {
 152                 platform_set_drvdata(pdev, hcd);
 153                 device_wakeup_enable(hcd->self.controller);
 154                 return ret;
 155         }
 156
 157 err_have_irq:
 158         irq_free_hwirq(pdata->irq);
 159 err_no_irq:
 160         tilegx_stop_ohc();
 161         usb_put_hcd(hcd);
 162 err_hcd:
 163         gxio_usb_host_destroy(&pdata->usb_ctx);
 164         return ret;
 165 }
 166
 167 static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev)
 168 {
 169         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 170         struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 171
 172         usb_remove_hcd(hcd);
 173         usb_put_hcd(hcd);
 174         tilegx_stop_ohc();
 175         gxio_usb_host_destroy(&pdata->usb_ctx);
 176         irq_free_hwirq(pdata->irq);
 177
 178         return 0;
 179 }
 180
 181 static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
 182 {
 183         usb_hcd_platform_shutdown(pdev);
 184         ohci_hcd_tilegx_drv_remove(pdev);
 185 }
 186
 187 static struct platform_driver ohci_hcd_tilegx_driver = {
 188         .probe          = ohci_hcd_tilegx_drv_probe,
 189         .remove         = ohci_hcd_tilegx_drv_remove,
 190         .shutdown       = ohci_hcd_tilegx_drv_shutdown,
 191         .driver = {
 192                 .name   = "tilegx-ohci",
 193         }
 194 };
 195
 196 MODULE_ALIAS("platform:tilegx-ohci");