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
  15 struct ehci_sh_priv {
  16         struct clk *iclk, *fclk;
  17         struct usb_hcd *hcd;
  18 };
  19
  20 static int ehci_sh_reset(struct usb_hcd *hcd)
  21 {
  22         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  23         int ret;
  24
  25         ehci->caps = hcd->regs;
  26         ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci,
  27                 &ehci->caps->hc_capbase));
  28
  29         dbg_hcs_params(ehci, "reset");
  30         dbg_hcc_params(ehci, "reset");
  31
  32         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  33
  34         ret = ehci_halt(ehci);
  35         if (unlikely(ret))
  36                 return ret;
  37
  38         ret = ehci_init(hcd);
  39         if (unlikely(ret))
  40                 return ret;
  41
  42         ehci->sbrn = 0x20;
  43
  44         ehci_reset(ehci);
  45         ehci_port_power(ehci, 0);
  46
  47         return ret;
  48 }
  49
  50 static const struct hc_driver ehci_sh_hc_driver = {
  51         .description                    = hcd_name,
  52         .product_desc                   = "SuperH EHCI",
  53         .hcd_priv_size                  = sizeof(struct ehci_hcd),
  54
  55         /*
  56          * generic hardware linkage
  57          */
  58         .irq                            = ehci_irq,
  59         .flags                          = HCD_USB2 | HCD_MEMORY,
  60
  61         /*
  62          * basic lifecycle operations
  63          */
  64         .reset                          = ehci_sh_reset,
  65         .start                          = ehci_run,
  66         .stop                           = ehci_stop,
  67         .shutdown                       = ehci_shutdown,
  68
  69         /*
  70          * managing i/o requests and associated device resources
  71          */
  72         .urb_enqueue                    = ehci_urb_enqueue,
  73         .urb_dequeue                    = ehci_urb_dequeue,
  74         .endpoint_disable               = ehci_endpoint_disable,
  75
  76         /*
  77          * scheduling support
  78          */
  79         .get_frame_number               = ehci_get_frame,
  80
  81         /*
  82          * root hub support
  83          */
  84         .hub_status_data                = ehci_hub_status_data,
  85         .hub_control                    = ehci_hub_control,
  86
  87 #ifdef CONFIG_PM
  88         .bus_suspend                    = ehci_bus_suspend,
  89         .bus_resume                     = ehci_bus_resume,
  90 #endif
  91
  92         .relinquish_port                = ehci_relinquish_port,
  93         .port_handed_over               = ehci_port_handed_over,
  94 };
  95
  96 static int ehci_hcd_sh_probe(struct platform_device *pdev)
  97 {
  98         const struct hc_driver *driver = &ehci_sh_hc_driver;
  99         struct resource *res;
 100         struct ehci_sh_priv *priv;
 101         struct usb_hcd *hcd;
 102         int irq, ret;
 103
 104         if (usb_disabled())
 105                 return -ENODEV;
 106
 107         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 108         if (!res) {
 109                 dev_err(&pdev->dev,
 110                         "Found HC with no register addr. Check %s setup!\n",
 111                         dev_name(&pdev->dev));
 112                 ret = -ENODEV;
 113                 goto fail_create_hcd;
 114         }
 115
 116         irq = platform_get_irq(pdev, 0);
 117         if (irq <= 0) {
 118                 dev_err(&pdev->dev,
 119                         "Found HC with no IRQ. Check %s setup!\n",
 120                         dev_name(&pdev->dev));
 121                 ret = -ENODEV;
 122                 goto fail_create_hcd;
 123         }
 124
 125         /* initialize hcd */
 126         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
 127                              dev_name(&pdev->dev));
 128         if (!hcd) {
 129                 ret = -ENOMEM;
 130                 goto fail_create_hcd;
 131         }
 132
 133         hcd->rsrc_start = res->start;
 134         hcd->rsrc_len = resource_size(res);
 135
 136         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 137                                 driver->description)) {
 138                 dev_dbg(&pdev->dev, "controller already in use\n");
 139                 ret = -EBUSY;
 140                 goto fail_request_resource;
 141         }
 142
 143         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 144         if (hcd->regs == NULL) {
 145                 dev_dbg(&pdev->dev, "error mapping memory\n");
 146                 ret = -ENXIO;
 147                 goto fail_ioremap;
 148         }
 149
 150         priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL);
 151         if (!priv) {
 152                 dev_dbg(&pdev->dev, "error allocating priv data\n");
 153                 ret = -ENOMEM;
 154                 goto fail_alloc;
 155         }
 156
 157         /* These are optional, we don't care if they fail */
 158         priv->fclk = clk_get(&pdev->dev, "usb_fck");
 159         if (IS_ERR(priv->fclk))
 160                 priv->fclk = NULL;
 161
 162         priv->iclk = clk_get(&pdev->dev, "usb_ick");
 163         if (IS_ERR(priv->iclk))
 164                 priv->iclk = NULL;
 165
 166         clk_enable(priv->fclk);
 167         clk_enable(priv->iclk);
 168
 169         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 170         if (ret != 0) {
 171                 dev_err(&pdev->dev, "Failed to add hcd");
 172                 goto fail_add_hcd;
 173         }
 174
 175         priv->hcd = hcd;
 176         platform_set_drvdata(pdev, priv);
 177
 178         return ret;
 179
 180 fail_add_hcd:
 181         clk_disable(priv->iclk);
 182         clk_disable(priv->fclk);
 183
 184         clk_put(priv->iclk);
 185         clk_put(priv->fclk);
 186
 187         kfree(priv);
 188 fail_alloc:
 189         iounmap(hcd->regs);
 190 fail_ioremap:
 191         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 192 fail_request_resource:
 193         usb_put_hcd(hcd);
 194 fail_create_hcd:
 195         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
 196
 197         return ret;
 198 }
 199
 200 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev)
 201 {
 202         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 203         struct usb_hcd *hcd = priv->hcd;
 204
 205         usb_remove_hcd(hcd);
 206         iounmap(hcd->regs);
 207         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 208         usb_put_hcd(hcd);
 209         platform_set_drvdata(pdev, NULL);
 210
 211         clk_disable(priv->fclk);
 212         clk_disable(priv->iclk);
 213
 214         clk_put(priv->fclk);
 215         clk_put(priv->iclk);
 216
 217         kfree(priv);
 218
 219         return 0;
 220 }
 221
 222 static struct platform_driver ehci_hcd_sh_driver = {
 223         .probe          = ehci_hcd_sh_probe,
 224         .remove         = __exit_p(ehci_hcd_sh_remove),
 225         .shutdown       = usb_hcd_platform_shutdown,
 226         .driver         = {
 227                 .name   = "sh_ehci",
 228                 .owner  = THIS_MODULE,
 229         },
 230 };
 231
 232 MODULE_ALIAS("platform:sh_ehci");