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");
138