kernel/drivers/usb/chipidea/ci_hdrc_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 #include <linux/usb/chipidea.h>
  15
  16 #include "ci.h"
  17
  18 #define MSM_USB_BASE    (ci->hw_bank.abs)
  19
  20 static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
  21 {
  22         struct device *dev = ci->gadget.dev.parent;
  23
  24         switch (event) {
  25         case CI_HDRC_CONTROLLER_RESET_EVENT:
  26                 dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");
  27                 writel(0, USB_AHBBURST);
  28                 writel(0, USB_AHBMODE);
  29                 usb_phy_init(ci->usb_phy);
  30                 break;
  31         case CI_HDRC_CONTROLLER_STOPPED_EVENT:
  32                 dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
  33                 /*
  34                  * Put the phy in non-driving mode. Otherwise host
  35                  * may not detect soft-disconnection.
  36                  */
  37                 usb_phy_notify_disconnect(ci->usb_phy, USB_SPEED_UNKNOWN);
  38                 break;
  39         default:
  40                 dev_dbg(dev, "unknown ci_hdrc event\n");
  41                 break;
  42         }
  43 }
  44
  45 static struct ci_hdrc_platform_data ci_hdrc_msm_platdata = {
  46         .name                   = "ci_hdrc_msm",
  47         .capoffset              = DEF_CAPOFFSET,
  48         .flags                  = CI_HDRC_REGS_SHARED |
  49                                   CI_HDRC_DISABLE_STREAMING,
  50
  51         .notify_event           = ci_hdrc_msm_notify_event,
  52 };
  53
  54 static int ci_hdrc_msm_probe(struct platform_device *pdev)
  55 {
  56         struct platform_device *plat_ci;
  57         struct usb_phy *phy;
  58
  59         dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");
  60
  61         /*
  62          * OTG(PHY) driver takes care of PHY initialization, clock management,
  63          * powering up VBUS, mapping of registers address space and power
  64          * management.
  65          */
  66         phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
  67         if (IS_ERR(phy))
  68                 return PTR_ERR(phy);
  69
  70         ci_hdrc_msm_platdata.usb_phy = phy;
  71
  72         plat_ci = ci_hdrc_add_device(&pdev->dev,
  73                                 pdev->resource, pdev->num_resources,
  74                                 &ci_hdrc_msm_platdata);
  75         if (IS_ERR(plat_ci)) {
  76                 dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
  77                 return PTR_ERR(plat_ci);
  78         }
  79
  80         platform_set_drvdata(pdev, plat_ci);
  81
  82         pm_runtime_no_callbacks(&pdev->dev);
  83         pm_runtime_enable(&pdev->dev);
  84
  85         return 0;
  86 }
  87
  88 static int ci_hdrc_msm_remove(struct platform_device *pdev)
  89 {
  90         struct platform_device *plat_ci = platform_get_drvdata(pdev);
  91
  92         pm_runtime_disable(&pdev->dev);
  93         ci_hdrc_remove_device(plat_ci);
  94
  95         return 0;
  96 }
  97
  98 static const struct of_device_id msm_ci_dt_match[] = {
  99         { .compatible = "qcom,ci-hdrc", },
 100         { }
 101 };
 102 MODULE_DEVICE_TABLE(of, msm_ci_dt_match);
 103
 104 static struct platform_driver ci_hdrc_msm_driver = {
 105         .probe = ci_hdrc_msm_probe,
 106         .remove = ci_hdrc_msm_remove,
 107         .driver = {
 108                 .name = "msm_hsusb",
 109                 .of_match_table = msm_ci_dt_match,
 110         },
 111 };
 112
 113 module_platform_driver(ci_hdrc_msm_driver);
 114
 115 MODULE_ALIAS("platform:msm_hsusb");
 116 MODULE_ALIAS("platform:ci13xxx_msm");
 117 MODULE_LICENSE("GPL v2");