drivers/usb/chipidea/ci13xxx_msm.c

   1 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/pm_runtime.h>
  11 #include <linux/usb/msm_hsusb_hw.h>
  12 #include <linux/usb/ulpi.h>
  13 #include <linux/usb/gadget.h>
  14
  15 #include "ci13xxx_udc.h"
  16
  17 #define MSM_USB_BASE    (udc->regs)
  18
  19 static void ci13xxx_msm_notify_event(struct ci13xxx *udc, unsigned event)
  20 {
  21         struct device *dev = udc->gadget.dev.parent;
  22         int val;
  23
  24         switch (event) {
  25         case CI13XXX_CONTROLLER_RESET_EVENT:
  26                 dev_dbg(dev, "CI13XXX_CONTROLLER_RESET_EVENT received\n");
  27                 writel(0, USB_AHBBURST);
  28                 writel(0, USB_AHBMODE);
  29                 break;
  30         case CI13XXX_CONTROLLER_STOPPED_EVENT:
  31                 dev_dbg(dev, "CI13XXX_CONTROLLER_STOPPED_EVENT received\n");
  32                 /*
  33                  * Put the transceiver in non-driving mode. Otherwise host
  34                  * may not detect soft-disconnection.
  35                  */
  36                 val = usb_phy_io_read(udc->transceiver, ULPI_FUNC_CTRL);
  37                 val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
  38                 val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
  39                 usb_phy_io_write(udc->transceiver, val, ULPI_FUNC_CTRL);
  40                 break;
  41         default:
  42                 dev_dbg(dev, "unknown ci13xxx_udc event\n");
  43                 break;
  44         }
  45 }
  46
  47 static struct ci13xxx_udc_driver ci13xxx_msm_udc_driver = {
  48         .name                   = "ci13xxx_msm",
  49         .flags                  = CI13XXX_REGS_SHARED |
  50                                   CI13XXX_REQUIRE_TRANSCEIVER |
  51                                   CI13XXX_PULLUP_ON_VBUS |
  52                                   CI13XXX_DISABLE_STREAMING,
  53
  54         .notify_event           = ci13xxx_msm_notify_event,
  55 };
  56
  57 static int ci13xxx_msm_probe(struct platform_device *pdev)
  58 {
  59         struct platform_device *plat_ci;
  60         int ret;
  61
  62         dev_dbg(&pdev->dev, "ci13xxx_msm_probe\n");
  63
  64         plat_ci = platform_device_alloc("ci_udc", -1);
  65         if (!plat_ci) {
  66                 dev_err(&pdev->dev, "can't allocate ci_udc platform device\n");
  67                 return -ENOMEM;
  68         }
  69
  70         ret = platform_device_add_resources(plat_ci, pdev->resource,
  71                                             pdev->num_resources);
  72         if (ret) {
  73                 dev_err(&pdev->dev, "can't add resources to platform device\n");
  74                 goto put_platform;
  75         }
  76
  77         ret = platform_device_add_data(plat_ci, &ci13xxx_msm_udc_driver,
  78                                        sizeof(ci13xxx_msm_udc_driver));
  79         if (ret)
  80                 goto put_platform;
  81
  82         ret = platform_device_add(plat_ci);
  83         if (ret)
  84                 goto put_platform;
  85
  86         pm_runtime_no_callbacks(&pdev->dev);
  87         pm_runtime_enable(&pdev->dev);
  88
  89         return 0;
  90
  91 put_platform:
  92         platform_device_put(plat_ci);
  93
  94         return ret;
  95 }
  96
  97 static struct platform_driver ci13xxx_msm_driver = {
  98         .probe = ci13xxx_msm_probe,
  99         .driver = { .name = "msm_hsusb", },
 100 };
 101 MODULE_ALIAS("platform:msm_hsusb");
 102
 103 static int __init ci13xxx_msm_init(void)
 104 {
 105         return platform_driver_register(&ci13xxx_msm_driver);
 106 }
 107 module_init(ci13xxx_msm_init);
 108
 109 MODULE_LICENSE("GPL v2");