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_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                 dev_err(&pdev->dev,
  89                         "Found HC with no IRQ. Check %s setup!\n",
  90                         dev_name(&pdev->dev));
  91                 ret = -ENODEV;
  92                 goto fail_create_hcd;
  93         }
  94
  95         pdata = dev_get_platdata(&pdev->dev);
  96
  97         /* initialize hcd */
  98         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
  99                              dev_name(&pdev->dev));
 100         if (!hcd) {
 101                 ret = -ENOMEM;
 102                 goto fail_create_hcd;
 103         }
 104
 105         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 106         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 107         if (IS_ERR(hcd->regs)) {
 108                 ret = PTR_ERR(hcd->regs);
 109                 goto fail_request_resource;
 110         }
 111         hcd->rsrc_start = res->start;
 112         hcd->rsrc_len = resource_size(res);
 113
 114         priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv),
 115                             GFP_KERNEL);
 116         if (!priv) {
 117                 ret = -ENOMEM;
 118                 goto fail_request_resource;
 119         }
 120
 121         /* These are optional, we don't care if they fail */
 122         priv->fclk = devm_clk_get(&pdev->dev, "usb_fck");
 123         if (IS_ERR(priv->fclk))
 124                 priv->fclk = NULL;
 125
 126         priv->iclk = devm_clk_get(&pdev->dev, "usb_ick");
 127         if (IS_ERR(priv->iclk))
 128                 priv->iclk = NULL;
 129
 130         clk_enable(priv->fclk);
 131         clk_enable(priv->iclk);
 132
 133         if (pdata && pdata->phy_init)
 134                 pdata->phy_init();
 135
 136         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 137         if (ret != 0) {
 138                 dev_err(&pdev->dev, "Failed to add hcd");
 139                 goto fail_add_hcd;
 140         }
 141         device_wakeup_enable(hcd->self.controller);
 142
 143         priv->hcd = hcd;
 144         platform_set_drvdata(pdev, priv);
 145
 146         return ret;
 147
 148 fail_add_hcd:
 149         clk_disable(priv->iclk);
 150         clk_disable(priv->fclk);
 151
 152 fail_request_resource:
 153         usb_put_hcd(hcd);
 154 fail_create_hcd:
 155         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
 156
 157         return ret;
 158 }
 159
 160 static int ehci_hcd_sh_remove(struct platform_device *pdev)
 161 {
 162         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 163         struct usb_hcd *hcd = priv->hcd;
 164
 165         usb_remove_hcd(hcd);
 166         usb_put_hcd(hcd);
 167
 168         clk_disable(priv->fclk);
 169         clk_disable(priv->iclk);
 170
 171         return 0;
 172 }
 173
 174 static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
 175 {
 176         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 177         struct usb_hcd *hcd = priv->hcd;
 178
 179         if (hcd->driver->shutdown)
 180                 hcd->driver->shutdown(hcd);
 181 }
 182
 183 static struct platform_driver ehci_hcd_sh_driver = {
 184         .probe          = ehci_hcd_sh_probe,
 185         .remove         = ehci_hcd_sh_remove,
 186         .shutdown       = ehci_hcd_sh_shutdown,
 187         .driver         = {
 188                 .name   = "sh_ehci",
 189         },
 190 };
 191
 192 MODULE_ALIAS("platform:sh_ehci");