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         int ret;
  25
  26         ehci->caps = hcd->regs;
  27
  28         ret = ehci_setup(hcd);
  29         if (unlikely(ret))
  30                 return ret;
  31
  32         ehci_port_power(ehci, 0);
  33
  34         return ret;
  35 }
  36
  37 static const struct hc_driver ehci_sh_hc_driver = {
  38         .description                    = hcd_name,
  39         .product_desc                   = "SuperH EHCI",
  40         .hcd_priv_size                  = sizeof(struct ehci_hcd),
  41
  42         /*
  43          * generic hardware linkage
  44          */
  45         .irq                            = ehci_irq,
  46         .flags                          = HCD_USB2 | HCD_MEMORY,
  47
  48         /*
  49          * basic lifecycle operations
  50          */
  51         .reset                          = ehci_sh_reset,
  52         .start                          = ehci_run,
  53         .stop                           = ehci_stop,
  54         .shutdown                       = ehci_shutdown,
  55
  56         /*
  57          * managing i/o requests and associated device resources
  58          */
  59         .urb_enqueue                    = ehci_urb_enqueue,
  60         .urb_dequeue                    = ehci_urb_dequeue,
  61         .endpoint_disable               = ehci_endpoint_disable,
  62         .endpoint_reset                 = ehci_endpoint_reset,
  63
  64         /*
  65          * scheduling support
  66          */
  67         .get_frame_number               = ehci_get_frame,
  68
  69         /*
  70          * root hub support
  71          */
  72         .hub_status_data                = ehci_hub_status_data,
  73         .hub_control                    = ehci_hub_control,
  74
  75 #ifdef CONFIG_PM
  76         .bus_suspend                    = ehci_bus_suspend,
  77         .bus_resume                     = ehci_bus_resume,
  78 #endif
  79
  80         .relinquish_port                = ehci_relinquish_port,
  81         .port_handed_over               = ehci_port_handed_over,
  82         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  83 };
  84
  85 static int ehci_hcd_sh_probe(struct platform_device *pdev)
  86 {
  87         const struct hc_driver *driver = &ehci_sh_hc_driver;
  88         struct resource *res;
  89         struct ehci_sh_priv *priv;
  90         struct ehci_sh_platdata *pdata;
  91         struct usb_hcd *hcd;
  92         int irq, ret;
  93
  94         if (usb_disabled())
  95                 return -ENODEV;
  96
  97         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  98         if (!res) {
  99                 dev_err(&pdev->dev,
 100                         "Found HC with no register addr. Check %s setup!\n",
 101                         dev_name(&pdev->dev));
 102                 ret = -ENODEV;
 103                 goto fail_create_hcd;
 104         }
 105
 106         irq = platform_get_irq(pdev, 0);
 107         if (irq <= 0) {
 108                 dev_err(&pdev->dev,
 109                         "Found HC with no IRQ. Check %s setup!\n",
 110                         dev_name(&pdev->dev));
 111                 ret = -ENODEV;
 112                 goto fail_create_hcd;
 113         }
 114
 115         pdata = pdev->dev.platform_data;
 116
 117         /* initialize hcd */
 118         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
 119                              dev_name(&pdev->dev));
 120         if (!hcd) {
 121                 ret = -ENOMEM;
 122                 goto fail_create_hcd;
 123         }
 124
 125         hcd->rsrc_start = res->start;
 126         hcd->rsrc_len = resource_size(res);
 127
 128         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 129                                 driver->description)) {
 130                 dev_dbg(&pdev->dev, "controller already in use\n");
 131                 ret = -EBUSY;
 132                 goto fail_request_resource;
 133         }
 134
 135         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 136         if (hcd->regs == NULL) {
 137                 dev_dbg(&pdev->dev, "error mapping memory\n");
 138                 ret = -ENXIO;
 139                 goto fail_ioremap;
 140         }
 141
 142         priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL);
 143         if (!priv) {
 144                 dev_dbg(&pdev->dev, "error allocating priv data\n");
 145                 ret = -ENOMEM;
 146                 goto fail_alloc;
 147         }
 148
 149         /* These are optional, we don't care if they fail */
 150         priv->fclk = clk_get(&pdev->dev, "usb_fck");
 151         if (IS_ERR(priv->fclk))
 152                 priv->fclk = NULL;
 153
 154         priv->iclk = clk_get(&pdev->dev, "usb_ick");
 155         if (IS_ERR(priv->iclk))
 156                 priv->iclk = NULL;
 157
 158         clk_enable(priv->fclk);
 159         clk_enable(priv->iclk);
 160
 161         if (pdata && pdata->phy_init)
 162                 pdata->phy_init();
 163
 164         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 165         if (ret != 0) {
 166                 dev_err(&pdev->dev, "Failed to add hcd");
 167                 goto fail_add_hcd;
 168         }
 169
 170         priv->hcd = hcd;
 171         platform_set_drvdata(pdev, priv);
 172
 173         return ret;
 174
 175 fail_add_hcd:
 176         clk_disable(priv->iclk);
 177         clk_disable(priv->fclk);
 178
 179         clk_put(priv->iclk);
 180         clk_put(priv->fclk);
 181
 182         kfree(priv);
 183 fail_alloc:
 184         iounmap(hcd->regs);
 185 fail_ioremap:
 186         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 187 fail_request_resource:
 188         usb_put_hcd(hcd);
 189 fail_create_hcd:
 190         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
 191
 192         return ret;
 193 }
 194
 195 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev)
 196 {
 197         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 198         struct usb_hcd *hcd = priv->hcd;
 199
 200         usb_remove_hcd(hcd);
 201         iounmap(hcd->regs);
 202         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 203         usb_put_hcd(hcd);
 204         platform_set_drvdata(pdev, NULL);
 205
 206         clk_disable(priv->fclk);
 207         clk_disable(priv->iclk);
 208
 209         clk_put(priv->fclk);
 210         clk_put(priv->iclk);
 211
 212         kfree(priv);
 213
 214         return 0;
 215 }
 216
 217 static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
 218 {
 219         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 220         struct usb_hcd *hcd = priv->hcd;
 221
 222         if (hcd->driver->shutdown)
 223                 hcd->driver->shutdown(hcd);
 224 }
 225
 226 static struct platform_driver ehci_hcd_sh_driver = {
 227         .probe          = ehci_hcd_sh_probe,
 228         .remove         = __exit_p(ehci_hcd_sh_remove),
 229         .shutdown       = ehci_hcd_sh_shutdown,
 230         .driver         = {
 231                 .name   = "sh_ehci",
 232                 .owner  = THIS_MODULE,
 233         },
 234 };
 235
 236 MODULE_ALIAS("platform:sh_ehci");