1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Renesas RZ/V2M USB3DRD driver
  4 *
  5 * Copyright (C) 2022 Renesas Electronics Corporation
  6 */
  7
  8#include <linux/io.h>
  9#include <linux/of_platform.h>
 10#include <linux/platform_device.h>
 11#include <linux/pm_runtime.h>
 12#include <linux/reset.h>
 13#include <linux/usb/rzv2m_usb3drd.h>
 14
 15#define USB_PERI_DRD_CON	0x000
 16
 17#define USB_PERI_DRD_CON_PERI_RST	BIT(31)
 18#define USB_PERI_DRD_CON_HOST_RST	BIT(30)
 19#define USB_PERI_DRD_CON_PERI_CON	BIT(24)
 20
 21static void rzv2m_usb3drd_set_bit(struct rzv2m_usb3drd *usb3, u32 bits,
 22				  u32 offs)
 23{
 24	u32 val = readl(usb3->reg + offs);
 25
 26	val |= bits;
 27	writel(val, usb3->reg + offs);
 28}
 29
 30static void rzv2m_usb3drd_clear_bit(struct rzv2m_usb3drd *usb3, u32 bits,
 31				    u32 offs)
 32{
 33	u32 val = readl(usb3->reg + offs);
 34
 35	val &= ~bits;
 36	writel(val, usb3->reg + offs);
 37}
 38
 39void rzv2m_usb3drd_reset(struct device *dev, bool host)
 40{
 41	struct rzv2m_usb3drd *usb3 = dev_get_drvdata(dev);
 42
 43	if (host) {
 44		rzv2m_usb3drd_clear_bit(usb3, USB_PERI_DRD_CON_PERI_CON,
 45					USB_PERI_DRD_CON);
 46		rzv2m_usb3drd_clear_bit(usb3, USB_PERI_DRD_CON_HOST_RST,
 47					USB_PERI_DRD_CON);
 48		rzv2m_usb3drd_set_bit(usb3, USB_PERI_DRD_CON_PERI_RST,
 49				      USB_PERI_DRD_CON);
 50	} else {
 51		rzv2m_usb3drd_set_bit(usb3, USB_PERI_DRD_CON_PERI_CON,
 52				      USB_PERI_DRD_CON);
 53		rzv2m_usb3drd_set_bit(usb3, USB_PERI_DRD_CON_HOST_RST,
 54				      USB_PERI_DRD_CON);
 55		rzv2m_usb3drd_clear_bit(usb3, USB_PERI_DRD_CON_PERI_RST,
 56					USB_PERI_DRD_CON);
 57	}
 58}
 59EXPORT_SYMBOL_GPL(rzv2m_usb3drd_reset);
 60
 61static void rzv2m_usb3drd_remove(struct platform_device *pdev)
 62{
 63	struct rzv2m_usb3drd *usb3 = platform_get_drvdata(pdev);
 64
 65	of_platform_depopulate(usb3->dev);
 66	pm_runtime_put(usb3->dev);
 67	pm_runtime_disable(&pdev->dev);
 68	reset_control_assert(usb3->drd_rstc);
 69}
 70
 71static int rzv2m_usb3drd_probe(struct platform_device *pdev)
 72{
 73	struct rzv2m_usb3drd *usb3;
 74	int ret;
 75
 76	usb3 = devm_kzalloc(&pdev->dev, sizeof(*usb3), GFP_KERNEL);
 77	if (!usb3)
 78		return -ENOMEM;
 79
 80	usb3->dev = &pdev->dev;
 81
 82	usb3->drd_irq = platform_get_irq_byname(pdev, "drd");
 83	if (usb3->drd_irq < 0)
 84		return usb3->drd_irq;
 85
 86	usb3->reg = devm_platform_ioremap_resource(pdev, 0);
 87	if (IS_ERR(usb3->reg))
 88		return PTR_ERR(usb3->reg);
 89
 90	platform_set_drvdata(pdev, usb3);
 91
 92	usb3->drd_rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
 93	if (IS_ERR(usb3->drd_rstc))
 94		return dev_err_probe(&pdev->dev, PTR_ERR(usb3->drd_rstc),
 95				     "failed to get drd reset");
 96
 97	reset_control_deassert(usb3->drd_rstc);
 98	pm_runtime_enable(&pdev->dev);
 99	ret = pm_runtime_resume_and_get(usb3->dev);
100	if (ret)
101		goto err_rst;
102
103	ret = of_platform_populate(usb3->dev->of_node, NULL, NULL, usb3->dev);
104	if (ret)
105		goto err_pm;
106
107	return 0;
108
109err_pm:
110	pm_runtime_put(usb3->dev);
111
112err_rst:
113	pm_runtime_disable(&pdev->dev);
114	reset_control_assert(usb3->drd_rstc);
115	return ret;
116}
117
118static const struct of_device_id rzv2m_usb3drd_of_match[] = {
119	{ .compatible = "renesas,rzv2m-usb3drd", },
120	{ /* Sentinel */ }
121};
122MODULE_DEVICE_TABLE(of, rzv2m_usb3drd_of_match);
123
124static struct platform_driver rzv2m_usb3drd_driver = {
125	.driver = {
126		.name = "rzv2m-usb3drd",
127		.of_match_table = rzv2m_usb3drd_of_match,
128	},
129	.probe = rzv2m_usb3drd_probe,
130	.remove_new = rzv2m_usb3drd_remove,
131};
132module_platform_driver(rzv2m_usb3drd_driver);
133
134MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
135MODULE_DESCRIPTION("Renesas RZ/V2M USB3DRD driver");
136MODULE_LICENSE("GPL");
137MODULE_ALIAS("platform:rzv2m_usb3drd");