tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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 int 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 return 0;
71}
72
73static int rzv2m_usb3drd_probe(struct platform_device *pdev)
74{
75 struct rzv2m_usb3drd *usb3;
76 int ret;
77
78 usb3 = devm_kzalloc(&pdev->dev, sizeof(*usb3), GFP_KERNEL);
79 if (!usb3)
80 return -ENOMEM;
81
82 usb3->dev = &pdev->dev;
83
84 usb3->drd_irq = platform_get_irq_byname(pdev, "drd");
85 if (usb3->drd_irq < 0)
86 return usb3->drd_irq;
87
88 usb3->reg = devm_platform_ioremap_resource(pdev, 0);
89 if (IS_ERR(usb3->reg))
90 return PTR_ERR(usb3->reg);
91
92 platform_set_drvdata(pdev, usb3);
93
94 usb3->drd_rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
95 if (IS_ERR(usb3->drd_rstc))
96 return dev_err_probe(&pdev->dev, PTR_ERR(usb3->drd_rstc),
97 "failed to get drd reset");
98
99 reset_control_deassert(usb3->drd_rstc);
100 pm_runtime_enable(&pdev->dev);
101 ret = pm_runtime_resume_and_get(usb3->dev);
102 if (ret)
103 goto err_rst;
104
105 ret = of_platform_populate(usb3->dev->of_node, NULL, NULL, usb3->dev);
106 if (ret)
107 goto err_pm;
108
109 return 0;
110
111err_pm:
112 pm_runtime_put(usb3->dev);
113
114err_rst:
115 pm_runtime_disable(&pdev->dev);
116 reset_control_assert(usb3->drd_rstc);
117 return ret;
118}
119
120static const struct of_device_id rzv2m_usb3drd_of_match[] = {
121 { .compatible = "renesas,rzv2m-usb3drd", },
122 { /* Sentinel */ }
123};
124MODULE_DEVICE_TABLE(of, rzv2m_usb3drd_of_match);
125
126static struct platform_driver rzv2m_usb3drd_driver = {
127 .driver = {
128 .name = "rzv2m-usb3drd",
129 .of_match_table = rzv2m_usb3drd_of_match,
130 },
131 .probe = rzv2m_usb3drd_probe,
132 .remove = rzv2m_usb3drd_remove,
133};
134module_platform_driver(rzv2m_usb3drd_driver);
135
136MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
137MODULE_DESCRIPTION("Renesas RZ/V2M USB3DRD driver");
138MODULE_LICENSE("GPL");
139MODULE_ALIAS("platform:rzv2m_usb3drd");