LXR linux/drivers/usb/chipidea/ci_hdrc

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2016, NVIDIA Corporation
   4 */
   5
   6#include <linux/clk.h>
   7#include <linux/module.h>
   8#include <linux/of_device.h>
   9#include <linux/reset.h>
  10
  11#include <linux/usb/chipidea.h>
  12
  13#include "ci.h"
  14
  15struct tegra_udc {
  16        struct ci_hdrc_platform_data data;
  17        struct platform_device *dev;
  18
  19        struct usb_phy *phy;
  20        struct clk *clk;
  21};
  22
  23struct tegra_udc_soc_info {
  24        unsigned long flags;
  25};
  26
  27static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
  28        .flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
  29};
  30
  31static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
  32        .flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
  33};
  34
  35static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
  36        .flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
  37};
  38
  39static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
  40        .flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
  41};
  42
  43static const struct of_device_id tegra_udc_of_match[] = {
  44        {
  45                .compatible = "nvidia,tegra20-udc",
  46                .data = &tegra20_udc_soc_info,
  47        }, {
  48                .compatible = "nvidia,tegra30-udc",
  49                .data = &tegra30_udc_soc_info,
  50        }, {
  51                .compatible = "nvidia,tegra114-udc",
  52                .data = &tegra114_udc_soc_info,
  53        }, {
  54                .compatible = "nvidia,tegra124-udc",
  55                .data = &tegra124_udc_soc_info,
  56        }, {
  57                /* sentinel */
  58        }
  59};
  60MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
  61
  62static int tegra_udc_probe(struct platform_device *pdev)
  63{
  64        const struct tegra_udc_soc_info *soc;
  65        struct tegra_udc *udc;
  66        int err;
  67
  68        udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
  69        if (!udc)
  70                return -ENOMEM;
  71
  72        soc = of_device_get_match_data(&pdev->dev);
  73        if (!soc) {
  74                dev_err(&pdev->dev, "failed to match OF data\n");
  75                return -EINVAL;
  76        }
  77
  78        udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
  79        if (IS_ERR(udc->phy)) {
  80                err = PTR_ERR(udc->phy);
  81                dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
  82                return err;
  83        }
  84
  85        udc->clk = devm_clk_get(&pdev->dev, NULL);
  86        if (IS_ERR(udc->clk)) {
  87                err = PTR_ERR(udc->clk);
  88                dev_err(&pdev->dev, "failed to get clock: %d\n", err);
  89                return err;
  90        }
  91
  92        err = clk_prepare_enable(udc->clk);
  93        if (err < 0) {
  94                dev_err(&pdev->dev, "failed to enable clock: %d\n", err);
  95                return err;
  96        }
  97
  98        /*
  99         * Tegra's USB PHY driver doesn't implement optional phy_init()
 100         * hook, so we have to power on UDC controller before ChipIdea
 101         * driver initialization kicks in.
 102         */
 103        usb_phy_set_suspend(udc->phy, 0);
 104
 105        /* setup and register ChipIdea HDRC device */
 106        udc->data.name = "tegra-udc";
 107        udc->data.flags = soc->flags;
 108        udc->data.usb_phy = udc->phy;
 109        udc->data.capoffset = DEF_CAPOFFSET;
 110
 111        udc->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,
 112                                      pdev->num_resources, &udc->data);
 113        if (IS_ERR(udc->dev)) {
 114                err = PTR_ERR(udc->dev);
 115                dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err);
 116                goto fail_power_off;
 117        }
 118
 119        platform_set_drvdata(pdev, udc);
 120
 121        return 0;
 122
 123fail_power_off:
 124        usb_phy_set_suspend(udc->phy, 1);
 125        clk_disable_unprepare(udc->clk);
 126        return err;
 127}
 128
 129static int tegra_udc_remove(struct platform_device *pdev)
 130{
 131        struct tegra_udc *udc = platform_get_drvdata(pdev);
 132
 133        ci_hdrc_remove_device(udc->dev);
 134        usb_phy_set_suspend(udc->phy, 1);
 135        clk_disable_unprepare(udc->clk);
 136
 137        return 0;
 138}
 139
 140static struct platform_driver tegra_udc_driver = {
 141        .driver = {
 142                .name = "tegra-udc",
 143                .of_match_table = tegra_udc_of_match,
 144        },
 145        .probe = tegra_udc_probe,
 146        .remove = tegra_udc_remove,
 147};
 148module_platform_driver(tegra_udc_driver);
 149
 150MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver");
 151MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
 152MODULE_ALIAS("platform:tegra-udc");
 153MODULE_LICENSE("GPL v2");
 154