drivers/usb/host/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 #include <linux/platform_data/ehci-sh.h>
  12
  13 struct ehci_sh_priv {
  14         struct clk *iclk, *fclk;
  15         struct usb_hcd *hcd;
  16 };
  17
  18 static int ehci_sh_reset(struct usb_hcd *hcd)
  19 {
  20         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  21
  22         ehci->caps = hcd->regs;
  23
  24         return ehci_setup(hcd);
  25 }
  26
  27 static const struct hc_driver ehci_sh_hc_driver = {
  28         .description                    = hcd_name,
  29         .product_desc                   = "SuperH EHCI",
  30         .hcd_priv_size                  = sizeof(struct ehci_hcd),
  31
  32         /*
  33          * generic hardware linkage
  34          */
  35         .irq                            = ehci_irq,
  36         .flags                          = HCD_USB2 | HCD_DMA | HCD_MEMORY | HCD_BH,
  37
  38         /*
  39          * basic lifecycle operations
  40          */
  41         .reset                          = ehci_sh_reset,
  42         .start                          = ehci_run,
  43         .stop                           = ehci_stop,
  44         .shutdown                       = ehci_shutdown,
  45
  46         /*
  47          * managing i/o requests and associated device resources
  48          */
  49         .urb_enqueue                    = ehci_urb_enqueue,
  50         .urb_dequeue                    = ehci_urb_dequeue,
  51         .endpoint_disable               = ehci_endpoint_disable,
  52         .endpoint_reset                 = ehci_endpoint_reset,
  53
  54         /*
  55          * scheduling support
  56          */
  57         .get_frame_number               = ehci_get_frame,
  58
  59         /*
  60          * root hub support
  61          */
  62         .hub_status_data                = ehci_hub_status_data,
  63         .hub_control                    = ehci_hub_control,
  64
  65 #ifdef CONFIG_PM
  66         .bus_suspend                    = ehci_bus_suspend,
  67         .bus_resume                     = ehci_bus_resume,
  68 #endif
  69
  70         .relinquish_port                = ehci_relinquish_port,
  71         .port_handed_over               = ehci_port_handed_over,
  72         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  73 };
  74
  75 static int ehci_hcd_sh_probe(struct platform_device *pdev)
  76 {
  77         struct resource *res;
  78         struct ehci_sh_priv *priv;
  79         struct ehci_sh_platdata *pdata;
  80         struct usb_hcd *hcd;
  81         int irq, ret;
  82
  83         if (usb_disabled())
  84                 return -ENODEV;
  85
  86         irq = platform_get_irq(pdev, 0);
  87         if (irq <= 0) {
  88                 ret = -ENODEV;
  89                 goto fail_create_hcd;
  90         }
  91
  92         pdata = dev_get_platdata(&pdev->dev);
  93
  94         /* initialize hcd */
  95         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
  96                              dev_name(&pdev->dev));
  97         if (!hcd) {
  98                 ret = -ENOMEM;
  99                 goto fail_create_hcd;
 100         }
 101
 102         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 103         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 104         if (IS_ERR(hcd->regs)) {
 105                 ret = PTR_ERR(hcd->regs);
 106                 goto fail_request_resource;
 107         }
 108         hcd->rsrc_start = res->start;
 109         hcd->rsrc_len = resource_size(res);
 110
 111         priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv),
 112                             GFP_KERNEL);
 113         if (!priv) {
 114                 ret = -ENOMEM;
 115                 goto fail_request_resource;
 116         }
 117
 118         /* These are optional, we don't care if they fail */
 119         priv->fclk = devm_clk_get(&pdev->dev, "usb_fck");
 120         if (IS_ERR(priv->fclk))
 121                 priv->fclk = NULL;
 122
 123         priv->iclk = devm_clk_get(&pdev->dev, "usb_ick");
 124         if (IS_ERR(priv->iclk))
 125                 priv->iclk = NULL;
 126
 127         clk_enable(priv->fclk);
 128         clk_enable(priv->iclk);
 129
 130         if (pdata && pdata->phy_init)
 131                 pdata->phy_init();
 132
 133         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 134         if (ret != 0) {
 135                 dev_err(&pdev->dev, "Failed to add hcd");
 136                 goto fail_add_hcd;
 137         }
 138         device_wakeup_enable(hcd->self.controller);
 139
 140         priv->hcd = hcd;
 141         platform_set_drvdata(pdev, priv);
 142
 143         return ret;
 144
 145 fail_add_hcd:
 146         clk_disable(priv->iclk);
 147         clk_disable(priv->fclk);
 148
 149 fail_request_resource:
 150         usb_put_hcd(hcd);
 151 fail_create_hcd:
 152         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
 153
 154         return ret;
 155 }
 156
 157 static int ehci_hcd_sh_remove(struct platform_device *pdev)
 158 {
 159         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 160         struct usb_hcd *hcd = priv->hcd;
 161
 162         usb_remove_hcd(hcd);
 163         usb_put_hcd(hcd);
 164
 165         clk_disable(priv->fclk);
 166         clk_disable(priv->iclk);
 167
 168         return 0;
 169 }
 170
 171 static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
 172 {
 173         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 174         struct usb_hcd *hcd = priv->hcd;
 175
 176         if (hcd->driver->shutdown)
 177                 hcd->driver->shutdown(hcd);
 178 }
 179
 180 static struct platform_driver ehci_hcd_sh_driver = {
 181         .probe          = ehci_hcd_sh_probe,
 182         .remove         = ehci_hcd_sh_remove,
 183         .shutdown       = ehci_hcd_sh_shutdown,
 184         .driver         = {
 185                 .name   = "sh_ehci",
 186         },
 187 };
 188
 189 MODULE_ALIAS("platform:sh_ehci");