kernel/drivers/usb/host/ehci-sh.c

   1 /*
   2  * SuperH EHCI host controller driver
   3  *
   4  * Copyright (C) 2010  Paul Mundt
   5  *
   6  * Based on ohci-sh.c and ehci-atmel.c.
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12 #include <linux/platform_device.h>
  13 #include <linux/clk.h>
  14 #include <linux/platform_data/ehci-sh.h>
  15
  16 struct ehci_sh_priv {
  17         struct clk *iclk, *fclk;
  18         struct usb_hcd *hcd;
  19 };
  20
  21 static int ehci_sh_reset(struct usb_hcd *hcd)
  22 {
  23         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  24
  25         ehci->caps = hcd->regs;
  26
  27         return ehci_setup(hcd);
  28 }
  29
  30 static const struct hc_driver ehci_sh_hc_driver = {
  31         .description                    = hcd_name,
  32         .product_desc                   = "SuperH EHCI",
  33         .hcd_priv_size                  = sizeof(struct ehci_hcd),
  34
  35         /*
  36          * generic hardware linkage
  37          */
  38         .irq                            = ehci_irq,
  39         .flags                          = HCD_USB2 | HCD_MEMORY | HCD_BH,
  40
  41         /*
  42          * basic lifecycle operations
  43          */
  44         .reset                          = ehci_sh_reset,
  45         .start                          = ehci_run,
  46         .stop                           = ehci_stop,
  47         .shutdown                       = ehci_shutdown,
  48
  49         /*
  50          * managing i/o requests and associated device resources
  51          */
  52         .urb_enqueue                    = ehci_urb_enqueue,
  53         .urb_dequeue                    = ehci_urb_dequeue,
  54         .endpoint_disable               = ehci_endpoint_disable,
  55         .endpoint_reset                 = ehci_endpoint_reset,
  56
  57         /*
  58          * scheduling support
  59          */
  60         .get_frame_number               = ehci_get_frame,
  61
  62         /*
  63          * root hub support
  64          */
  65         .hub_status_data                = ehci_hub_status_data,
  66         .hub_control                    = ehci_hub_control,
  67
  68 #ifdef CONFIG_PM
  69         .bus_suspend                    = ehci_bus_suspend,
  70         .bus_resume                     = ehci_bus_resume,
  71 #endif
  72
  73         .relinquish_port                = ehci_relinquish_port,
  74         .port_handed_over               = ehci_port_handed_over,
  75         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  76 };
  77
  78 static int ehci_hcd_sh_probe(struct platform_device *pdev)
  79 {
  80         struct resource *res;
  81         struct ehci_sh_priv *priv;
  82         struct ehci_sh_platdata *pdata;
  83         struct usb_hcd *hcd;
  84         int irq, ret;
  85
  86         if (usb_disabled())
  87                 return -ENODEV;
  88
  89         irq = platform_get_irq(pdev, 0);
  90         if (irq <= 0) {
  91                 dev_err(&pdev->dev,
  92                         "Found HC with no IRQ. Check %s setup!\n",
  93                         dev_name(&pdev->dev));
  94                 ret = -ENODEV;
  95                 goto fail_create_hcd;
  96         }
  97
  98         pdata = dev_get_platdata(&pdev->dev);
  99
 100         /* initialize hcd */
 101         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
 102                              dev_name(&pdev->dev));
 103         if (!hcd) {
 104                 ret = -ENOMEM;
 105                 goto fail_create_hcd;
 106         }
 107
 108         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 109         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 110         if (IS_ERR(hcd->regs)) {
 111                 ret = PTR_ERR(hcd->regs);
 112                 goto fail_request_resource;
 113         }
 114         hcd->rsrc_start = res->start;
 115         hcd->rsrc_len = resource_size(res);
 116
 117         priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv),
 118                             GFP_KERNEL);
 119         if (!priv) {
 120                 ret = -ENOMEM;
 121                 goto fail_request_resource;
 122         }
 123
 124         /* These are optional, we don't care if they fail */
 125         priv->fclk = devm_clk_get(&pdev->dev, "usb_fck");
 126         if (IS_ERR(priv->fclk))
 127                 priv->fclk = NULL;
 128
 129         priv->iclk = devm_clk_get(&pdev->dev, "usb_ick");
 130         if (IS_ERR(priv->iclk))
 131                 priv->iclk = NULL;
 132
 133         clk_enable(priv->fclk);
 134         clk_enable(priv->iclk);
 135
 136         if (pdata && pdata->phy_init)
 137                 pdata->phy_init();
 138
 139         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 140         if (ret != 0) {
 141                 dev_err(&pdev->dev, "Failed to add hcd");
 142                 goto fail_add_hcd;
 143         }
 144         device_wakeup_enable(hcd->self.controller);
 145
 146         priv->hcd = hcd;
 147         platform_set_drvdata(pdev, priv);
 148
 149         return ret;
 150
 151 fail_add_hcd:
 152         clk_disable(priv->iclk);
 153         clk_disable(priv->fclk);
 154
 155 fail_request_resource:
 156         usb_put_hcd(hcd);
 157 fail_create_hcd:
 158         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
 159
 160         return ret;
 161 }
 162
 163 static int ehci_hcd_sh_remove(struct platform_device *pdev)
 164 {
 165         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 166         struct usb_hcd *hcd = priv->hcd;
 167
 168         usb_remove_hcd(hcd);
 169         usb_put_hcd(hcd);
 170
 171         clk_disable(priv->fclk);
 172         clk_disable(priv->iclk);
 173
 174         return 0;
 175 }
 176
 177 static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
 178 {
 179         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 180         struct usb_hcd *hcd = priv->hcd;
 181
 182         if (hcd->driver->shutdown)
 183                 hcd->driver->shutdown(hcd);
 184 }
 185
 186 static struct platform_driver ehci_hcd_sh_driver = {
 187         .probe          = ehci_hcd_sh_probe,
 188         .remove         = ehci_hcd_sh_remove,
 189         .shutdown       = ehci_hcd_sh_shutdown,
 190         .driver         = {
 191                 .name   = "sh_ehci",
 192         },
 193 };
 194
 195 MODULE_ALIAS("platform:sh_ehci");