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         .endpoint_reset                 = ehci_endpoint_reset,
  76
  77         /*
  78          * scheduling support
  79          */
  80         .get_frame_number               = ehci_get_frame,
  81
  82         /*
  83          * root hub support
  84          */
  85         .hub_status_data                = ehci_hub_status_data,
  86         .hub_control                    = ehci_hub_control,
  87
  88 #ifdef CONFIG_PM
  89         .bus_suspend                    = ehci_bus_suspend,
  90         .bus_resume                     = ehci_bus_resume,
  91 #endif
  92
  93         .relinquish_port                = ehci_relinquish_port,
  94         .port_handed_over               = ehci_port_handed_over,
  95         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  96 };
  97
  98 static int ehci_hcd_sh_probe(struct platform_device *pdev)
  99 {
 100         const struct hc_driver *driver = &ehci_sh_hc_driver;
 101         struct resource *res;
 102         struct ehci_sh_priv *priv;
 103         struct usb_hcd *hcd;
 104         int irq, ret;
 105
 106         if (usb_disabled())
 107                 return -ENODEV;
 108
 109         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 110         if (!res) {
 111                 dev_err(&pdev->dev,
 112                         "Found HC with no register addr. Check %s setup!\n",
 113                         dev_name(&pdev->dev));
 114                 ret = -ENODEV;
 115                 goto fail_create_hcd;
 116         }
 117
 118         irq = platform_get_irq(pdev, 0);
 119         if (irq <= 0) {
 120                 dev_err(&pdev->dev,
 121                         "Found HC with no IRQ. Check %s setup!\n",
 122                         dev_name(&pdev->dev));
 123                 ret = -ENODEV;
 124                 goto fail_create_hcd;
 125         }
 126
 127         /* initialize hcd */
 128         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
 129                              dev_name(&pdev->dev));
 130         if (!hcd) {
 131                 ret = -ENOMEM;
 132                 goto fail_create_hcd;
 133         }
 134
 135         hcd->rsrc_start = res->start;
 136         hcd->rsrc_len = resource_size(res);
 137
 138         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 139                                 driver->description)) {
 140                 dev_dbg(&pdev->dev, "controller already in use\n");
 141                 ret = -EBUSY;
 142                 goto fail_request_resource;
 143         }
 144
 145         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 146         if (hcd->regs == NULL) {
 147                 dev_dbg(&pdev->dev, "error mapping memory\n");
 148                 ret = -ENXIO;
 149                 goto fail_ioremap;
 150         }
 151
 152         priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL);
 153         if (!priv) {
 154                 dev_dbg(&pdev->dev, "error allocating priv data\n");
 155                 ret = -ENOMEM;
 156                 goto fail_alloc;
 157         }
 158
 159         /* These are optional, we don't care if they fail */
 160         priv->fclk = clk_get(&pdev->dev, "usb_fck");
 161         if (IS_ERR(priv->fclk))
 162                 priv->fclk = NULL;
 163
 164         priv->iclk = clk_get(&pdev->dev, "usb_ick");
 165         if (IS_ERR(priv->iclk))
 166                 priv->iclk = NULL;
 167
 168         clk_enable(priv->fclk);
 169         clk_enable(priv->iclk);
 170
 171         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 172         if (ret != 0) {
 173                 dev_err(&pdev->dev, "Failed to add hcd");
 174                 goto fail_add_hcd;
 175         }
 176
 177         priv->hcd = hcd;
 178         platform_set_drvdata(pdev, priv);
 179
 180         return ret;
 181
 182 fail_add_hcd:
 183         clk_disable(priv->iclk);
 184         clk_disable(priv->fclk);
 185
 186         clk_put(priv->iclk);
 187         clk_put(priv->fclk);
 188
 189         kfree(priv);
 190 fail_alloc:
 191         iounmap(hcd->regs);
 192 fail_ioremap:
 193         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 194 fail_request_resource:
 195         usb_put_hcd(hcd);
 196 fail_create_hcd:
 197         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
 198
 199         return ret;
 200 }
 201
 202 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev)
 203 {
 204         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 205         struct usb_hcd *hcd = priv->hcd;
 206
 207         usb_remove_hcd(hcd);
 208         iounmap(hcd->regs);
 209         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 210         usb_put_hcd(hcd);
 211         platform_set_drvdata(pdev, NULL);
 212
 213         clk_disable(priv->fclk);
 214         clk_disable(priv->iclk);
 215
 216         clk_put(priv->fclk);
 217         clk_put(priv->iclk);
 218
 219         kfree(priv);
 220
 221         return 0;
 222 }
 223
 224 static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
 225 {
 226         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 227         struct usb_hcd *hcd = priv->hcd;
 228
 229         if (hcd->driver->shutdown)
 230                 hcd->driver->shutdown(hcd);
 231 }
 232
 233 static struct platform_driver ehci_hcd_sh_driver = {
 234         .probe          = ehci_hcd_sh_probe,
 235         .remove         = __exit_p(ehci_hcd_sh_remove),
 236         .shutdown       = ehci_hcd_sh_shutdown,
 237         .driver         = {
 238                 .name   = "sh_ehci",
 239                 .owner  = THIS_MODULE,
 240         },
 241 };
 242
 243 MODULE_ALIAS("platform:sh_ehci");