drivers/usb/chipidea/ci_hdrc_tegra.c

   1 /*
   2  * Copyright (c) 2016, NVIDIA Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/module.h>
  11 #include <linux/of_device.h>
  12 #include <linux/reset.h>
  13
  14 #include <linux/usb/chipidea.h>
  15
  16 #include "ci.h"
  17
  18 struct tegra_udc {
  19         struct ci_hdrc_platform_data data;
  20         struct platform_device *dev;
  21
  22         struct usb_phy *phy;
  23         struct clk *clk;
  24 };
  25
  26 struct tegra_udc_soc_info {
  27         unsigned long flags;
  28 };
  29
  30 static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
  31         .flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
  32 };
  33
  34 static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
  35         .flags = 0,
  36 };
  37
  38 static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
  39         .flags = 0,
  40 };
  41
  42 static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
  43         .flags = 0,
  44 };
  45
  46 static const struct of_device_id tegra_udc_of_match[] = {
  47         {
  48                 .compatible = "nvidia,tegra20-udc",
  49                 .data = &tegra20_udc_soc_info,
  50         }, {
  51                 .compatible = "nvidia,tegra30-udc",
  52                 .data = &tegra30_udc_soc_info,
  53         }, {
  54                 .compatible = "nvidia,tegra114-udc",
  55                 .data = &tegra114_udc_soc_info,
  56         }, {
  57                 .compatible = "nvidia,tegra124-udc",
  58                 .data = &tegra124_udc_soc_info,
  59         }, {
  60                 /* sentinel */
  61         }
  62 };
  63 MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
  64
  65 static int tegra_udc_probe(struct platform_device *pdev)
  66 {
  67         const struct tegra_udc_soc_info *soc;
  68         struct tegra_udc *udc;
  69         int err;
  70
  71         udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
  72         if (!udc)
  73                 return -ENOMEM;
  74
  75         soc = of_device_get_match_data(&pdev->dev);
  76         if (!soc) {
  77                 dev_err(&pdev->dev, "failed to match OF data\n");
  78                 return -EINVAL;
  79         }
  80
  81         udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
  82         if (IS_ERR(udc->phy)) {
  83                 err = PTR_ERR(udc->phy);
  84                 dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
  85                 return err;
  86         }
  87
  88         udc->clk = devm_clk_get(&pdev->dev, NULL);
  89         if (IS_ERR(udc->clk)) {
  90                 err = PTR_ERR(udc->clk);
  91                 dev_err(&pdev->dev, "failed to get clock: %d\n", err);
  92                 return err;
  93         }
  94
  95         err = clk_prepare_enable(udc->clk);
  96         if (err < 0) {
  97                 dev_err(&pdev->dev, "failed to enable clock: %d\n", err);
  98                 return err;
  99         }
 100
 101         /*
 102          * Tegra's USB PHY driver doesn't implement optional phy_init()
 103          * hook, so we have to power on UDC controller before ChipIdea
 104          * driver initialization kicks in.
 105          */
 106         usb_phy_set_suspend(udc->phy, 0);
 107
 108         /* setup and register ChipIdea HDRC device */
 109         udc->data.name = "tegra-udc";
 110         udc->data.flags = soc->flags;
 111         udc->data.usb_phy = udc->phy;
 112         udc->data.capoffset = DEF_CAPOFFSET;
 113
 114         udc->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,
 115                                       pdev->num_resources, &udc->data);
 116         if (IS_ERR(udc->dev)) {
 117                 err = PTR_ERR(udc->dev);
 118                 dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err);
 119                 goto fail_power_off;
 120         }
 121
 122         platform_set_drvdata(pdev, udc);
 123
 124         return 0;
 125
 126 fail_power_off:
 127         usb_phy_set_suspend(udc->phy, 1);
 128         clk_disable_unprepare(udc->clk);
 129         return err;
 130 }
 131
 132 static int tegra_udc_remove(struct platform_device *pdev)
 133 {
 134         struct tegra_udc *udc = platform_get_drvdata(pdev);
 135
 136         usb_phy_set_suspend(udc->phy, 1);
 137         clk_disable_unprepare(udc->clk);
 138
 139         return 0;
 140 }
 141
 142 static struct platform_driver tegra_udc_driver = {
 143         .driver = {
 144                 .name = "tegra-udc",
 145                 .of_match_table = tegra_udc_of_match,
 146         },
 147         .probe = tegra_udc_probe,
 148         .remove = tegra_udc_remove,
 149 };
 150 module_platform_driver(tegra_udc_driver);
 151
 152 MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver");
 153 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
 154 MODULE_ALIAS("platform:tegra-udc");
 155 MODULE_LICENSE("GPL v2");