drivers/usb/host/ehci-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 EHCI 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_ehc(void)
  21 {
  22 }
  23
  24 static void tilegx_stop_ehc(void)
  25 {
  26 }
  27
  28 static int tilegx_ehci_setup(struct usb_hcd *hcd)
  29 {
  30         int ret = ehci_init(hcd);
  31
  32         /*
  33          * Some drivers do:
  34          *
  35          *   struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  36          *   ehci->need_io_watchdog = 0;
  37          *
  38          * here, but since this is a new driver we're going to leave the
  39          * watchdog enabled.  Later we may try to turn it off and see
  40          * whether we run into any problems.
  41          */
  42
  43         return ret;
  44 }
  45
  46 static const struct hc_driver ehci_tilegx_hc_driver = {
  47         .description            = hcd_name,
  48         .product_desc           = "Tile-Gx EHCI",
  49         .hcd_priv_size          = sizeof(struct ehci_hcd),
  50
  51         /*
  52          * Generic hardware linkage.
  53          */
  54         .irq                    = ehci_irq,
  55         .flags                  = HCD_MEMORY | HCD_USB2 | HCD_BH,
  56
  57         /*
  58          * Basic lifecycle operations.
  59          */
  60         .reset                  = tilegx_ehci_setup,
  61         .start                  = ehci_run,
  62         .stop                   = ehci_stop,
  63         .shutdown               = ehci_shutdown,
  64
  65         /*
  66          * Managing I/O requests and associated device resources.
  67          */
  68         .urb_enqueue            = ehci_urb_enqueue,
  69         .urb_dequeue            = ehci_urb_dequeue,
  70         .endpoint_disable       = ehci_endpoint_disable,
  71         .endpoint_reset         = ehci_endpoint_reset,
  72
  73         /*
  74          * Scheduling support.
  75          */
  76         .get_frame_number       = ehci_get_frame,
  77
  78         /*
  79          * Root hub support.
  80          */
  81         .hub_status_data        = ehci_hub_status_data,
  82         .hub_control            = ehci_hub_control,
  83         .bus_suspend            = ehci_bus_suspend,
  84         .bus_resume             = ehci_bus_resume,
  85         .relinquish_port        = ehci_relinquish_port,
  86         .port_handed_over       = ehci_port_handed_over,
  87
  88         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  89 };
  90
  91 static int ehci_hcd_tilegx_drv_probe(struct platform_device *pdev)
  92 {
  93         struct usb_hcd *hcd;
  94         struct ehci_hcd *ehci;
  95         struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
  96         pte_t pte = { 0 };
  97         int my_cpu = smp_processor_id();
  98         int ret;
  99
 100         if (usb_disabled())
 101                 return -ENODEV;
 102
 103         /*
 104          * Try to initialize our GXIO context; if we can't, the device
 105          * doesn't exist.
 106          */
 107         if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 1) != 0)
 108                 return -ENXIO;
 109
 110         hcd = usb_create_hcd(&ehci_tilegx_hc_driver, &pdev->dev,
 111                              dev_name(&pdev->dev));
 112         if (!hcd) {
 113           ret = -ENOMEM;
 114           goto err_hcd;
 115         }
 116
 117         /*
 118          * We don't use rsrc_start to map in our registers, but seems like
 119          * we ought to set it to something, so we use the register VA.
 120          */
 121         hcd->rsrc_start =
 122                 (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
 123         hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
 124         hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
 125
 126         tilegx_start_ehc();
 127
 128         ehci = hcd_to_ehci(hcd);
 129         ehci->caps = hcd->regs;
 130         ehci->regs =
 131                 hcd->regs + HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
 132         /* cache this readonly data; minimize chip reads */
 133         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 134
 135         /* Create our IRQs and register them. */
 136         pdata->irq = irq_alloc_hwirq(-1);
 137         if (!pdata->irq) {
 138                 ret = -ENXIO;
 139                 goto err_no_irq;
 140         }
 141
 142         tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
 143
 144         /* Configure interrupts. */
 145         ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
 146                                           cpu_x(my_cpu), cpu_y(my_cpu),
 147                                           KERNEL_PL, pdata->irq);
 148         if (ret) {
 149                 ret = -ENXIO;
 150                 goto err_have_irq;
 151         }
 152
 153         /* Register all of our memory. */
 154         pte = pte_set_home(pte, PAGE_HOME_HASH);
 155         ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
 156         if (ret) {
 157                 ret = -ENXIO;
 158                 goto err_have_irq;
 159         }
 160
 161         ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
 162         if (ret == 0) {
 163                 platform_set_drvdata(pdev, hcd);
 164                 device_wakeup_enable(hcd->self.controller);
 165                 return ret;
 166         }
 167
 168 err_have_irq:
 169         irq_free_hwirq(pdata->irq);
 170 err_no_irq:
 171         tilegx_stop_ehc();
 172         usb_put_hcd(hcd);
 173 err_hcd:
 174         gxio_usb_host_destroy(&pdata->usb_ctx);
 175         return ret;
 176 }
 177
 178 static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)
 179 {
 180         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 181         struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 182
 183         usb_remove_hcd(hcd);
 184         usb_put_hcd(hcd);
 185         tilegx_stop_ehc();
 186         gxio_usb_host_destroy(&pdata->usb_ctx);
 187         irq_free_hwirq(pdata->irq);
 188
 189         return 0;
 190 }
 191
 192 static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
 193 {
 194         usb_hcd_platform_shutdown(pdev);
 195         ehci_hcd_tilegx_drv_remove(pdev);
 196 }
 197
 198 static struct platform_driver ehci_hcd_tilegx_driver = {
 199         .probe          = ehci_hcd_tilegx_drv_probe,
 200         .remove         = ehci_hcd_tilegx_drv_remove,
 201         .shutdown       = ehci_hcd_tilegx_drv_shutdown,
 202         .driver = {
 203                 .name   = "tilegx-ehci",
 204         }
 205 };
 206
 207 MODULE_ALIAS("platform:tilegx-ehci");