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 tegra_udc_soc_info = {
 28	.flags = CI_HDRC_REQUIRES_ALIGNED_DMA,
 29};
 30
 31static const struct of_device_id tegra_udc_of_match[] = {
 32	{
 33		.compatible = "nvidia,tegra20-udc",
 34		.data = &tegra_udc_soc_info,
 35	}, {
 36		.compatible = "nvidia,tegra30-udc",
 37		.data = &tegra_udc_soc_info,
 38	}, {
 39		.compatible = "nvidia,tegra114-udc",
 40		.data = &tegra_udc_soc_info,
 41	}, {
 42		.compatible = "nvidia,tegra124-udc",
 43		.data = &tegra_udc_soc_info,
 44	}, {
 45		/* sentinel */
 46	}
 47};
 48MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
 49
 50static int tegra_udc_probe(struct platform_device *pdev)
 51{
 52	const struct tegra_udc_soc_info *soc;
 53	struct tegra_udc *udc;
 54	int err;
 55
 56	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
 57	if (!udc)
 58		return -ENOMEM;
 59
 60	soc = of_device_get_match_data(&pdev->dev);
 61	if (!soc) {
 62		dev_err(&pdev->dev, "failed to match OF data\n");
 63		return -EINVAL;
 64	}
 65
 66	udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
 67	if (IS_ERR(udc->phy)) {
 68		err = PTR_ERR(udc->phy);
 69		dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
 70		return err;
 71	}
 72
 73	udc->clk = devm_clk_get(&pdev->dev, NULL);
 74	if (IS_ERR(udc->clk)) {
 75		err = PTR_ERR(udc->clk);
 76		dev_err(&pdev->dev, "failed to get clock: %d\n", err);
 77		return err;
 78	}
 79
 80	err = clk_prepare_enable(udc->clk);
 81	if (err < 0) {
 82		dev_err(&pdev->dev, "failed to enable clock: %d\n", err);
 83		return err;
 84	}
 85
 86	/* setup and register ChipIdea HDRC device */
 87	udc->data.name = "tegra-udc";
 88	udc->data.flags = soc->flags;
 89	udc->data.usb_phy = udc->phy;
 90	udc->data.capoffset = DEF_CAPOFFSET;
 91
 92	udc->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,
 93				      pdev->num_resources, &udc->data);
 94	if (IS_ERR(udc->dev)) {
 95		err = PTR_ERR(udc->dev);
 96		dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err);
 97		goto fail_power_off;
 98	}
 99
100	platform_set_drvdata(pdev, udc);
101
102	return 0;
103
104fail_power_off:
105	clk_disable_unprepare(udc->clk);
106	return err;
107}
108
109static int tegra_udc_remove(struct platform_device *pdev)
110{
111	struct tegra_udc *udc = platform_get_drvdata(pdev);
112
113	ci_hdrc_remove_device(udc->dev);
114	clk_disable_unprepare(udc->clk);
115
116	return 0;
117}
118
119static struct platform_driver tegra_udc_driver = {
120	.driver = {
121		.name = "tegra-udc",
122		.of_match_table = tegra_udc_of_match,
123	},
124	.probe = tegra_udc_probe,
125	.remove = tegra_udc_remove,
126};
127module_platform_driver(tegra_udc_driver);
128
129MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver");
130MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
131MODULE_ALIAS("platform:tegra-udc");
132MODULE_LICENSE("GPL v2");