ehci-sh.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * SuperH EHCI host controller driver
   4  *
   5  * Copyright (C) 2010  Paul Mundt
   6  *
   7  * Based on ohci-sh.c and ehci-atmel.c.
   8  */
   9 #include <linux/platform_device.h>
  10 #include <linux/clk.h>
  11
  12 struct ehci_sh_priv {
  13         struct clk *iclk, *fclk;
  14         struct usb_hcd *hcd;
  15 };
  16
  17 static int ehci_sh_reset(struct usb_hcd *hcd)
  18 {
  19         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  20
  21         ehci->caps = hcd->regs;
  22
  23         return ehci_setup(hcd);
  24 }
  25
  26 static const struct hc_driver ehci_sh_hc_driver = {
  27         .description                    = hcd_name,
  28         .product_desc                   = "SuperH EHCI",
  29         .hcd_priv_size                  = sizeof(struct ehci_hcd),
  30
  31         /*
  32          * generic hardware linkage
  33          */
  34         .irq                            = ehci_irq,
  35         .flags                          = HCD_USB2 | HCD_DMA | HCD_MEMORY | HCD_BH,
  36
  37         /*
  38          * basic lifecycle operations
  39          */
  40         .reset                          = ehci_sh_reset,
  41         .start                          = ehci_run,
  42         .stop                           = ehci_stop,
  43         .shutdown                       = ehci_shutdown,
  44
  45         /*
  46          * managing i/o requests and associated device resources
  47          */
  48         .urb_enqueue                    = ehci_urb_enqueue,
  49         .urb_dequeue                    = ehci_urb_dequeue,
  50         .endpoint_disable               = ehci_endpoint_disable,
  51         .endpoint_reset                 = ehci_endpoint_reset,
  52
  53         /*
  54          * scheduling support
  55          */
  56         .get_frame_number               = ehci_get_frame,
  57
  58         /*
  59          * root hub support
  60          */
  61         .hub_status_data                = ehci_hub_status_data,
  62         .hub_control                    = ehci_hub_control,
  63
  64 #ifdef CONFIG_PM
  65         .bus_suspend                    = ehci_bus_suspend,
  66         .bus_resume                     = ehci_bus_resume,
  67 #endif
  68
  69         .relinquish_port                = ehci_relinquish_port,
  70         .port_handed_over               = ehci_port_handed_over,
  71         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  72 };
  73
  74 static int ehci_hcd_sh_probe(struct platform_device *pdev)
  75 {
  76         struct resource *res;
  77         struct ehci_sh_priv *priv;
  78         struct usb_hcd *hcd;
  79         int irq, ret;
  80
  81         if (usb_disabled())
  82                 return -ENODEV;
  83
  84         irq = platform_get_irq(pdev, 0);
  85         if (irq < 0) {
  86                 ret = irq;
  87                 goto fail_create_hcd;
  88         }
  89
  90         /* initialize hcd */
  91         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
  92                              dev_name(&pdev->dev));
  93         if (!hcd) {
  94                 ret = -ENOMEM;
  95                 goto fail_create_hcd;
  96         }
  97
  98         hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
  99         if (IS_ERR(hcd->regs)) {
 100                 ret = PTR_ERR(hcd->regs);
 101                 goto fail_request_resource;
 102         }
 103         hcd->rsrc_start = res->start;
 104         hcd->rsrc_len = resource_size(res);
 105
 106         priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv),
 107                             GFP_KERNEL);
 108         if (!priv) {
 109                 ret = -ENOMEM;
 110                 goto fail_request_resource;
 111         }
 112
 113         /* These are optional, we don't care if they fail */
 114         priv->fclk = devm_clk_get(&pdev->dev, "usb_fck");
 115         if (IS_ERR(priv->fclk))
 116                 priv->fclk = NULL;
 117
 118         priv->iclk = devm_clk_get(&pdev->dev, "usb_ick");
 119         if (IS_ERR(priv->iclk))
 120                 priv->iclk = NULL;
 121
 122         clk_enable(priv->fclk);
 123         clk_enable(priv->iclk);
 124
 125         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 126         if (ret != 0) {
 127                 dev_err(&pdev->dev, "Failed to add hcd");
 128                 goto fail_add_hcd;
 129         }
 130         device_wakeup_enable(hcd->self.controller);
 131
 132         priv->hcd = hcd;
 133         platform_set_drvdata(pdev, priv);
 134
 135         return ret;
 136
 137 fail_add_hcd:
 138         clk_disable(priv->iclk);
 139         clk_disable(priv->fclk);
 140
 141 fail_request_resource:
 142         usb_put_hcd(hcd);
 143 fail_create_hcd:
 144         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
 145
 146         return ret;
 147 }
 148
 149 static void ehci_hcd_sh_remove(struct platform_device *pdev)
 150 {
 151         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 152         struct usb_hcd *hcd = priv->hcd;
 153
 154         usb_remove_hcd(hcd);
 155         usb_put_hcd(hcd);
 156
 157         clk_disable(priv->fclk);
 158         clk_disable(priv->iclk);
 159 }
 160
 161 static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
 162 {
 163         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 164         struct usb_hcd *hcd = priv->hcd;
 165
 166         if (hcd->driver->shutdown)
 167                 hcd->driver->shutdown(hcd);
 168 }
 169
 170 static struct platform_driver ehci_hcd_sh_driver = {
 171         .probe          = ehci_hcd_sh_probe,
 172         .remove_new     = ehci_hcd_sh_remove,
 173         .shutdown       = ehci_hcd_sh_shutdown,
 174         .driver         = {
 175                 .name   = "sh_ehci",
 176         },
 177 };
 178
 179 MODULE_ALIAS("platform:sh_ehci");