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