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         ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci,
  28                 &ehci->caps->hc_capbase));
  29
  30         dbg_hcs_params(ehci, "reset");
  31         dbg_hcc_params(ehci, "reset");
  32
  33         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  34
  35         ret = ehci_halt(ehci);
  36         if (unlikely(ret))
  37                 return ret;
  38
  39         ret = ehci_init(hcd);
  40         if (unlikely(ret))
  41                 return ret;
  42
  43         ehci->sbrn = 0x20;
  44
  45         ehci_reset(ehci);
  46         ehci_port_power(ehci, 0);
  47
  48         return ret;
  49 }
  50
  51 static const struct hc_driver ehci_sh_hc_driver = {
  52         .description                    = hcd_name,
  53         .product_desc                   = "SuperH EHCI",
  54         .hcd_priv_size                  = sizeof(struct ehci_hcd),
  55
  56         /*
  57          * generic hardware linkage
  58          */
  59         .irq                            = ehci_irq,
  60         .flags                          = HCD_USB2 | HCD_MEMORY,
  61
  62         /*
  63          * basic lifecycle operations
  64          */
  65         .reset                          = ehci_sh_reset,
  66         .start                          = ehci_run,
  67         .stop                           = ehci_stop,
  68         .shutdown                       = ehci_shutdown,
  69
  70         /*
  71          * managing i/o requests and associated device resources
  72          */
  73         .urb_enqueue                    = ehci_urb_enqueue,
  74         .urb_dequeue                    = ehci_urb_dequeue,
  75         .endpoint_disable               = ehci_endpoint_disable,
  76         .endpoint_reset                 = ehci_endpoint_reset,
  77
  78         /*
  79          * scheduling support
  80          */
  81         .get_frame_number               = ehci_get_frame,
  82
  83         /*
  84          * root hub support
  85          */
  86         .hub_status_data                = ehci_hub_status_data,
  87         .hub_control                    = ehci_hub_control,
  88
  89 #ifdef CONFIG_PM
  90         .bus_suspend                    = ehci_bus_suspend,
  91         .bus_resume                     = ehci_bus_resume,
  92 #endif
  93
  94         .relinquish_port                = ehci_relinquish_port,
  95         .port_handed_over               = ehci_port_handed_over,
  96         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  97 };
  98
  99 static int ehci_hcd_sh_probe(struct platform_device *pdev)
 100 {
 101         const struct hc_driver *driver = &ehci_sh_hc_driver;
 102         struct resource *res;
 103         struct ehci_sh_priv *priv;
 104         struct ehci_sh_platdata *pdata;
 105         struct usb_hcd *hcd;
 106         int irq, ret;
 107
 108         if (usb_disabled())
 109                 return -ENODEV;
 110
 111         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 112         if (!res) {
 113                 dev_err(&pdev->dev,
 114                         "Found HC with no register addr. Check %s setup!\n",
 115                         dev_name(&pdev->dev));
 116                 ret = -ENODEV;
 117                 goto fail_create_hcd;
 118         }
 119
 120         irq = platform_get_irq(pdev, 0);
 121         if (irq <= 0) {
 122                 dev_err(&pdev->dev,
 123                         "Found HC with no IRQ. Check %s setup!\n",
 124                         dev_name(&pdev->dev));
 125                 ret = -ENODEV;
 126                 goto fail_create_hcd;
 127         }
 128
 129         if (pdev->dev.platform_data != NULL)
 130                 pdata = pdev->dev.platform_data;
 131
 132         /* initialize hcd */
 133         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
 134                              dev_name(&pdev->dev));
 135         if (!hcd) {
 136                 ret = -ENOMEM;
 137                 goto fail_create_hcd;
 138         }
 139
 140         hcd->rsrc_start = res->start;
 141         hcd->rsrc_len = resource_size(res);
 142
 143         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 144                                 driver->description)) {
 145                 dev_dbg(&pdev->dev, "controller already in use\n");
 146                 ret = -EBUSY;
 147                 goto fail_request_resource;
 148         }
 149
 150         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 151         if (hcd->regs == NULL) {
 152                 dev_dbg(&pdev->dev, "error mapping memory\n");
 153                 ret = -ENXIO;
 154                 goto fail_ioremap;
 155         }
 156
 157         priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL);
 158         if (!priv) {
 159                 dev_dbg(&pdev->dev, "error allocating priv data\n");
 160                 ret = -ENOMEM;
 161                 goto fail_alloc;
 162         }
 163
 164         /* These are optional, we don't care if they fail */
 165         priv->fclk = clk_get(&pdev->dev, "usb_fck");
 166         if (IS_ERR(priv->fclk))
 167                 priv->fclk = NULL;
 168
 169         priv->iclk = clk_get(&pdev->dev, "usb_ick");
 170         if (IS_ERR(priv->iclk))
 171                 priv->iclk = NULL;
 172
 173         clk_enable(priv->fclk);
 174         clk_enable(priv->iclk);
 175
 176         if (pdata && pdata->phy_init)
 177                 pdata->phy_init();
 178
 179         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 180         if (ret != 0) {
 181                 dev_err(&pdev->dev, "Failed to add hcd");
 182                 goto fail_add_hcd;
 183         }
 184
 185         priv->hcd = hcd;
 186         platform_set_drvdata(pdev, priv);
 187
 188         return ret;
 189
 190 fail_add_hcd:
 191         clk_disable(priv->iclk);
 192         clk_disable(priv->fclk);
 193
 194         clk_put(priv->iclk);
 195         clk_put(priv->fclk);
 196
 197         kfree(priv);
 198 fail_alloc:
 199         iounmap(hcd->regs);
 200 fail_ioremap:
 201         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 202 fail_request_resource:
 203         usb_put_hcd(hcd);
 204 fail_create_hcd:
 205         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
 206
 207         return ret;
 208 }
 209
 210 static int __exit ehci_hcd_sh_remove(struct platform_device *pdev)
 211 {
 212         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 213         struct usb_hcd *hcd = priv->hcd;
 214
 215         usb_remove_hcd(hcd);
 216         iounmap(hcd->regs);
 217         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 218         usb_put_hcd(hcd);
 219         platform_set_drvdata(pdev, NULL);
 220
 221         clk_disable(priv->fclk);
 222         clk_disable(priv->iclk);
 223
 224         clk_put(priv->fclk);
 225         clk_put(priv->iclk);
 226
 227         kfree(priv);
 228
 229         return 0;
 230 }
 231
 232 static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
 233 {
 234         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
 235         struct usb_hcd *hcd = priv->hcd;
 236
 237         if (hcd->driver->shutdown)
 238                 hcd->driver->shutdown(hcd);
 239 }
 240
 241 static struct platform_driver ehci_hcd_sh_driver = {
 242         .probe          = ehci_hcd_sh_probe,
 243         .remove         = __exit_p(ehci_hcd_sh_remove),
 244         .shutdown       = ehci_hcd_sh_shutdown,
 245         .driver         = {
 246                 .name   = "sh_ehci",
 247                 .owner  = THIS_MODULE,
 248         },
 249 };
 250
 251 MODULE_ALIAS("platform:sh_ehci");