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 = 0,
 37};
 38
 39static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
 40	.flags = 0,
 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	usb_phy_set_suspend(udc->phy, 1);
134	clk_disable_unprepare(udc->clk);
135
136	return 0;
137}
138
139static struct platform_driver tegra_udc_driver = {
140	.driver = {
141		.name = "tegra-udc",
142		.of_match_table = tegra_udc_of_match,
143	},
144	.probe = tegra_udc_probe,
145	.remove = tegra_udc_remove,
146};
147module_platform_driver(tegra_udc_driver);
148
149MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver");
150MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
151MODULE_ALIAS("platform:tegra-udc");
152MODULE_LICENSE("GPL v2");