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,
  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         const struct hc_driver *driver = &ehci_sh_hc_driver;
  81         struct resource *res;
  82         struct ehci_sh_priv *priv;
  83         struct ehci_sh_platdata *pdata;
  84         struct usb_hcd *hcd;
  85         int irq, ret;
  86
  87         if (usb_disabled())
  88                 return -ENODEV;
  89
  90         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  91         if (!res) {
  92                 dev_err(&pdev->dev,
  93                         "Found HC with no register addr. Check %s setup!\n",
  94                         dev_name(&pdev->dev));
  95                 ret = -ENODEV;
  96                 goto fail_create_hcd;
  97         }
  98
  99         irq = platform_get_irq(pdev, 0);
 100         if (irq <= 0) {
 101                 dev_err(&pdev->dev,
 102                         "Found HC with no IRQ. Check %s setup!\n",
 103                         dev_name(&pdev->dev));
 104                 ret = -ENODEV;
 105                 goto fail_create_hcd;
 106         }
 107
 108         pdata = pdev->dev.platform_data;
 109
 110         /* initialize hcd */
 111         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
 112                              dev_name(&pdev->dev));
 113         if (!hcd) {
 114                 ret = -ENOMEM;
 115                 goto fail_create_hcd;
 116         }
 117
 118         hcd->rsrc_start = res->start;
 119         hcd->rsrc_len = resource_size(res);
 120
 121         hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
 122         if (hcd->regs == NULL) {
 123                 dev_dbg(&pdev->dev, "error mapping memory\n");
 124                 ret = -ENXIO;
 125                 goto fail_request_resource;
 126         }
 127
 128         priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv),
 129                             GFP_KERNEL);
 130         if (!priv) {
 131                 dev_dbg(&pdev->dev, "error allocating priv data\n");
 132                 ret = -ENOMEM;
 133                 goto fail_request_resource;
 134         }
 135
 136         /* These are optional, we don't care if they fail */
 137         priv->fclk = devm_clk_get(&pdev->dev, "usb_fck");
 138         if (IS_ERR(priv->fclk))
 139                 priv->fclk = NULL;
 140
 141         priv->iclk = devm_clk_get(&pdev->dev, "usb_ick");
 142         if (IS_ERR(priv->iclk))
 143                 priv->iclk = NULL;
 144
 145         clk_enable(priv->fclk);
 146         clk_enable(priv->iclk);
 147
 148         if (pdata && pdata->phy_init)
 149                 pdata->phy_init();
 150
 151         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 152         if (ret != 0) {
 153                 dev_err(&pdev->dev, "Failed to add hcd");
 154                 goto fail_add_hcd;
 155         }
 156
 157         priv->hcd = hcd;
 158         platform_set_drvdata(pdev, priv);
 159
 160         return ret;
 161
 162 fail_add_hcd:
 163         clk_disable(priv->iclk);
 164         clk_disable(priv->fclk);
 165
 166 fail_request_resource:
 167         usb_put_hcd(hcd);
 168 fail_create_hcd:
 169         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
 170
 171         return ret;
 172 }
 173
 174 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev)
 175 {
 176         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 177         struct usb_hcd *hcd = priv->hcd;
 178
 179         usb_remove_hcd(hcd);
 180         usb_put_hcd(hcd);
 181         platform_set_drvdata(pdev, NULL);
 182
 183         clk_disable(priv->fclk);
 184         clk_disable(priv->iclk);
 185
 186         return 0;
 187 }
 188
 189 static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
 190 {
 191         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 192         struct usb_hcd *hcd = priv->hcd;
 193
 194         if (hcd->driver->shutdown)
 195                 hcd->driver->shutdown(hcd);
 196 }
 197
 198 static struct platform_driver ehci_hcd_sh_driver = {
 199         .probe          = ehci_hcd_sh_probe,
 200         .remove         = __exit_p(ehci_hcd_sh_remove),
 201         .shutdown       = ehci_hcd_sh_shutdown,
 202         .driver         = {
 203                 .name   = "sh_ehci",
 204                 .owner  = THIS_MODULE,
 205         },
 206 };
 207
 208 MODULE_ALIAS("platform:sh_ehci");