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/gadget.h>
  12 #include <linux/usb/chipidea.h>
  13 #include <linux/clk.h>
  14 #include <linux/reset.h>
  15
  16 #include "ci.h"
  17
  18 #define HS_PHY_AHB_MODE                 0x0098
  19
  20 struct ci_hdrc_msm {
  21         struct platform_device *ci;
  22         struct clk *core_clk;
  23         struct clk *iface_clk;
  24         struct clk *fs_clk;
  25 };
  26
  27 static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
  28 {
  29         struct device *dev = ci->gadget.dev.parent;
  30
  31         switch (event) {
  32         case CI_HDRC_CONTROLLER_RESET_EVENT:
  33                 dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");
  34                 /* use AHB transactor, allow posted data writes */
  35                 hw_write_id_reg(ci, HS_PHY_AHB_MODE, 0xffffffff, 0x8);
  36                 usb_phy_init(ci->usb_phy);
  37                 break;
  38         case CI_HDRC_CONTROLLER_STOPPED_EVENT:
  39                 dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
  40                 /*
  41                  * Put the phy in non-driving mode. Otherwise host
  42                  * may not detect soft-disconnection.
  43                  */
  44                 usb_phy_notify_disconnect(ci->usb_phy, USB_SPEED_UNKNOWN);
  45                 break;
  46         default:
  47                 dev_dbg(dev, "unknown ci_hdrc event\n");
  48                 break;
  49         }
  50 }
  51
  52 static struct ci_hdrc_platform_data ci_hdrc_msm_platdata = {
  53         .name                   = "ci_hdrc_msm",
  54         .capoffset              = DEF_CAPOFFSET,
  55         .flags                  = CI_HDRC_REGS_SHARED |
  56                                   CI_HDRC_DISABLE_STREAMING |
  57                                   CI_HDRC_OVERRIDE_AHB_BURST,
  58
  59         .notify_event           = ci_hdrc_msm_notify_event,
  60 };
  61
  62 static int ci_hdrc_msm_probe(struct platform_device *pdev)
  63 {
  64         struct ci_hdrc_msm *ci;
  65         struct platform_device *plat_ci;
  66         struct usb_phy *phy;
  67         struct clk *clk;
  68         struct reset_control *reset;
  69         int ret;
  70
  71         dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");
  72
  73         ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
  74         if (!ci)
  75                 return -ENOMEM;
  76         platform_set_drvdata(pdev, ci);
  77
  78         /*
  79          * OTG(PHY) driver takes care of PHY initialization, clock management,
  80          * powering up VBUS, mapping of registers address space and power
  81          * management.
  82          */
  83         phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
  84         if (IS_ERR(phy))
  85                 return PTR_ERR(phy);
  86
  87         ci_hdrc_msm_platdata.usb_phy = phy;
  88
  89         reset = devm_reset_control_get(&pdev->dev, "core");
  90         if (IS_ERR(reset))
  91                 return PTR_ERR(reset);
  92
  93         ci->core_clk = clk = devm_clk_get(&pdev->dev, "core");
  94         if (IS_ERR(clk))
  95                 return PTR_ERR(clk);
  96
  97         ci->iface_clk = clk = devm_clk_get(&pdev->dev, "iface");
  98         if (IS_ERR(clk))
  99                 return PTR_ERR(clk);
 100
 101         ci->fs_clk = clk = devm_clk_get(&pdev->dev, "fs");
 102         if (IS_ERR(clk)) {
 103                 if (PTR_ERR(clk) == -EPROBE_DEFER)
 104                         return -EPROBE_DEFER;
 105                 ci->fs_clk = NULL;
 106         }
 107
 108         ret = clk_prepare_enable(ci->fs_clk);
 109         if (ret)
 110                 return ret;
 111
 112         reset_control_assert(reset);
 113         usleep_range(10000, 12000);
 114         reset_control_deassert(reset);
 115
 116         clk_disable_unprepare(ci->fs_clk);
 117
 118         ret = clk_prepare_enable(ci->core_clk);
 119         if (ret)
 120                 return ret;
 121
 122         ret = clk_prepare_enable(ci->iface_clk);
 123         if (ret)
 124                 goto err_iface;
 125
 126         plat_ci = ci_hdrc_add_device(&pdev->dev,
 127                                 pdev->resource, pdev->num_resources,
 128                                 &ci_hdrc_msm_platdata);
 129         if (IS_ERR(plat_ci)) {
 130                 dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
 131                 ret = PTR_ERR(plat_ci);
 132                 goto err_mux;
 133         }
 134
 135         ci->ci = plat_ci;
 136
 137         pm_runtime_set_active(&pdev->dev);
 138         pm_runtime_no_callbacks(&pdev->dev);
 139         pm_runtime_enable(&pdev->dev);
 140
 141         return 0;
 142
 143 err_mux:
 144         clk_disable_unprepare(ci->iface_clk);
 145 err_iface:
 146         clk_disable_unprepare(ci->core_clk);
 147         return ret;
 148 }
 149
 150 static int ci_hdrc_msm_remove(struct platform_device *pdev)
 151 {
 152         struct ci_hdrc_msm *ci = platform_get_drvdata(pdev);
 153
 154         pm_runtime_disable(&pdev->dev);
 155         ci_hdrc_remove_device(ci->ci);
 156         clk_disable_unprepare(ci->iface_clk);
 157         clk_disable_unprepare(ci->core_clk);
 158
 159         return 0;
 160 }
 161
 162 static const struct of_device_id msm_ci_dt_match[] = {
 163         { .compatible = "qcom,ci-hdrc", },
 164         { }
 165 };
 166 MODULE_DEVICE_TABLE(of, msm_ci_dt_match);
 167
 168 static struct platform_driver ci_hdrc_msm_driver = {
 169         .probe = ci_hdrc_msm_probe,
 170         .remove = ci_hdrc_msm_remove,
 171         .driver = {
 172                 .name = "msm_hsusb",
 173                 .of_match_table = msm_ci_dt_match,
 174         },
 175 };
 176
 177 module_platform_driver(ci_hdrc_msm_driver);
 178
 179 MODULE_ALIAS("platform:msm_hsusb");
 180 MODULE_ALIAS("platform:ci13xxx_msm");
 181 MODULE_LICENSE("GPL v2");