drivers/usb/host/ohci-spear.c

   1 /*
   2 * OHCI HCD (Host Controller Driver) for USB.
   3 *
   4 * Copyright (C) 2010 ST Microelectronics.
   5 * Deepak Sikri<deepak.sikri@st.com>
   6 *
   7 * Based on various ohci-*.c drivers
   8 *
   9 * This file is licensed under the terms of the GNU General Public
  10 * License version 2. This program is licensed "as is" without any
  11 * warranty of any kind, whether express or implied.
  12 */
  13
  14 #include <linux/signal.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/clk.h>
  17
  18 struct spear_ohci {
  19         struct ohci_hcd ohci;
  20         struct clk *clk;
  21 };
  22
  23 #define to_spear_ohci(hcd)      (struct spear_ohci *)hcd_to_ohci(hcd)
  24
  25 static void spear_start_ohci(struct spear_ohci *ohci)
  26 {
  27         clk_enable(ohci->clk);
  28 }
  29
  30 static void spear_stop_ohci(struct spear_ohci *ohci)
  31 {
  32         clk_disable(ohci->clk);
  33 }
  34
  35 static int __devinit ohci_spear_start(struct usb_hcd *hcd)
  36 {
  37         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  38         int ret;
  39
  40         ret = ohci_init(ohci);
  41         if (ret < 0)
  42                 return ret;
  43         ohci->regs = hcd->regs;
  44
  45         ret = ohci_run(ohci);
  46         if (ret < 0) {
  47                 dev_err(hcd->self.controller, "can't start\n");
  48                 ohci_stop(hcd);
  49                 return ret;
  50         }
  51
  52         create_debug_files(ohci);
  53
  54 #ifdef DEBUG
  55         ohci_dump(ohci, 1);
  56 #endif
  57         return 0;
  58 }
  59
  60 static const struct hc_driver ohci_spear_hc_driver = {
  61         .description            = hcd_name,
  62         .product_desc           = "SPEAr OHCI",
  63         .hcd_priv_size          = sizeof(struct spear_ohci),
  64
  65         /* generic hardware linkage */
  66         .irq                    = ohci_irq,
  67         .flags                  = HCD_USB11 | HCD_MEMORY,
  68
  69         /* basic lifecycle operations */
  70         .start                  = ohci_spear_start,
  71         .stop                   = ohci_stop,
  72         .shutdown               = ohci_shutdown,
  73 #ifdef  CONFIG_PM
  74         .bus_suspend            = ohci_bus_suspend,
  75         .bus_resume             = ohci_bus_resume,
  76 #endif
  77
  78         /* managing i/o requests and associated device resources */
  79         .urb_enqueue            = ohci_urb_enqueue,
  80         .urb_dequeue            = ohci_urb_dequeue,
  81         .endpoint_disable       = ohci_endpoint_disable,
  82
  83         /* scheduling support */
  84         .get_frame_number       = ohci_get_frame,
  85
  86         /* root hub support */
  87         .hub_status_data        = ohci_hub_status_data,
  88         .hub_control            = ohci_hub_control,
  89
  90         .start_port_reset       = ohci_start_port_reset,
  91 };
  92
  93 static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
  94 {
  95         const struct hc_driver *driver = &ohci_spear_hc_driver;
  96         struct usb_hcd *hcd = NULL;
  97         struct clk *usbh_clk;
  98         struct spear_ohci *ohci_p;
  99         struct resource *res;
 100         int retval, irq;
 101         int *pdata = pdev->dev.platform_data;
 102         char clk_name[20] = "usbh_clk";
 103
 104         if (pdata == NULL)
 105                 return -EFAULT;
 106
 107         irq = platform_get_irq(pdev, 0);
 108         if (irq < 0) {
 109                 retval = irq;
 110                 goto fail_irq_get;
 111         }
 112
 113         if (*pdata >= 0)
 114                 sprintf(clk_name, "usbh.%01d_clk", *pdata);
 115
 116         usbh_clk = clk_get(NULL, clk_name);
 117         if (IS_ERR(usbh_clk)) {
 118                 dev_err(&pdev->dev, "Error getting interface clock\n");
 119                 retval = PTR_ERR(usbh_clk);
 120                 goto fail_get_usbh_clk;
 121         }
 122
 123         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 124         if (!hcd) {
 125                 retval = -ENOMEM;
 126                 goto fail_create_hcd;
 127         }
 128
 129         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 130         if (!res) {
 131                 retval = -ENODEV;
 132                 goto fail_request_resource;
 133         }
 134
 135         hcd->rsrc_start = pdev->resource[0].start;
 136         hcd->rsrc_len = resource_size(res);
 137         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 138                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 139                 retval = -EBUSY;
 140                 goto fail_request_resource;
 141         }
 142
 143         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 144         if (!hcd->regs) {
 145                 dev_dbg(&pdev->dev, "ioremap failed\n");
 146                 retval = -ENOMEM;
 147                 goto fail_ioremap;
 148         }
 149
 150         ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd);
 151         ohci_p->clk = usbh_clk;
 152         spear_start_ohci(ohci_p);
 153         ohci_hcd_init(hcd_to_ohci(hcd));
 154
 155         retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), IRQF_DISABLED);
 156         if (retval == 0)
 157                 return retval;
 158
 159         spear_stop_ohci(ohci_p);
 160         iounmap(hcd->regs);
 161 fail_ioremap:
 162         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 163 fail_request_resource:
 164         usb_put_hcd(hcd);
 165 fail_create_hcd:
 166         clk_put(usbh_clk);
 167 fail_get_usbh_clk:
 168 fail_irq_get:
 169         dev_err(&pdev->dev, "init fail, %d\n", retval);
 170
 171         return retval;
 172 }
 173
 174 static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
 175 {
 176         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 177         struct spear_ohci *ohci_p = to_spear_ohci(hcd);
 178
 179         usb_remove_hcd(hcd);
 180         if (ohci_p->clk)
 181                 spear_stop_ohci(ohci_p);
 182
 183         iounmap(hcd->regs);
 184         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 185         usb_put_hcd(hcd);
 186
 187         if (ohci_p->clk)
 188                 clk_put(ohci_p->clk);
 189         platform_set_drvdata(pdev, NULL);
 190         return 0;
 191 }
 192
 193 #if defined(CONFIG_PM)
 194 static int spear_ohci_hcd_drv_suspend(struct platform_device *dev,
 195                 pm_message_t message)
 196 {
 197         struct usb_hcd *hcd = platform_get_drvdata(dev);
 198         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 199         struct spear_ohci *ohci_p = to_spear_ohci(hcd);
 200
 201         if (time_before(jiffies, ohci->next_statechange))
 202                 msleep(5);
 203         ohci->next_statechange = jiffies;
 204
 205         spear_stop_ohci(ohci_p);
 206         ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
 207         return 0;
 208 }
 209
 210 static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
 211 {
 212         struct usb_hcd *hcd = platform_get_drvdata(dev);
 213         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 214         struct spear_ohci *ohci_p = to_spear_ohci(hcd);
 215
 216         if (time_before(jiffies, ohci->next_statechange))
 217                 msleep(5);
 218         ohci->next_statechange = jiffies;
 219
 220         spear_start_ohci(ohci_p);
 221         ohci_finish_controller_resume(hcd);
 222         return 0;
 223 }
 224 #endif
 225
 226 /* Driver definition to register with the platform bus */
 227 static struct platform_driver spear_ohci_hcd_driver = {
 228         .probe =        spear_ohci_hcd_drv_probe,
 229         .remove =       spear_ohci_hcd_drv_remove,
 230 #ifdef CONFIG_PM
 231         .suspend =      spear_ohci_hcd_drv_suspend,
 232         .resume =       spear_ohci_hcd_drv_resume,
 233 #endif
 234         .driver = {
 235                 .owner = THIS_MODULE,
 236                 .name = "spear-ohci",
 237         },
 238 };
 239
 240 MODULE_ALIAS("platform:spear-ohci");