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 | |
21 | static void rzv2m_usb3drd_set_bit(struct rzv2m_usb3drd *usb3, u32 bits, |
22 | u32 offs) |
23 | { |
24 | u32 val = readl(addr: usb3->reg + offs); |
25 | |
26 | val |= bits; |
27 | writel(val, addr: usb3->reg + offs); |
28 | } |
29 | |
30 | static void rzv2m_usb3drd_clear_bit(struct rzv2m_usb3drd *usb3, u32 bits, |
31 | u32 offs) |
32 | { |
33 | u32 val = readl(addr: usb3->reg + offs); |
34 | |
35 | val &= ~bits; |
36 | writel(val, addr: usb3->reg + offs); |
37 | } |
38 | |
39 | void 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 | } |
59 | EXPORT_SYMBOL_GPL(rzv2m_usb3drd_reset); |
60 | |
61 | static void rzv2m_usb3drd_remove(struct platform_device *pdev) |
62 | { |
63 | struct rzv2m_usb3drd *usb3 = platform_get_drvdata(pdev); |
64 | |
65 | of_platform_depopulate(parent: usb3->dev); |
66 | pm_runtime_put(dev: usb3->dev); |
67 | pm_runtime_disable(dev: &pdev->dev); |
68 | reset_control_assert(rstc: usb3->drd_rstc); |
69 | } |
70 | |
71 | static int rzv2m_usb3drd_probe(struct platform_device *pdev) |
72 | { |
73 | struct rzv2m_usb3drd *usb3; |
74 | int ret; |
75 | |
76 | usb3 = devm_kzalloc(dev: &pdev->dev, size: 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, index: 0); |
87 | if (IS_ERR(ptr: usb3->reg)) |
88 | return PTR_ERR(ptr: usb3->reg); |
89 | |
90 | platform_set_drvdata(pdev, data: usb3); |
91 | |
92 | usb3->drd_rstc = devm_reset_control_get_exclusive(dev: &pdev->dev, NULL); |
93 | if (IS_ERR(ptr: usb3->drd_rstc)) |
94 | return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: usb3->drd_rstc), |
95 | fmt: "failed to get drd reset" ); |
96 | |
97 | reset_control_deassert(rstc: usb3->drd_rstc); |
98 | pm_runtime_enable(dev: &pdev->dev); |
99 | ret = pm_runtime_resume_and_get(dev: usb3->dev); |
100 | if (ret) |
101 | goto err_rst; |
102 | |
103 | ret = of_platform_populate(root: usb3->dev->of_node, NULL, NULL, parent: usb3->dev); |
104 | if (ret) |
105 | goto err_pm; |
106 | |
107 | return 0; |
108 | |
109 | err_pm: |
110 | pm_runtime_put(dev: usb3->dev); |
111 | |
112 | err_rst: |
113 | pm_runtime_disable(dev: &pdev->dev); |
114 | reset_control_assert(rstc: usb3->drd_rstc); |
115 | return ret; |
116 | } |
117 | |
118 | static const struct of_device_id rzv2m_usb3drd_of_match[] = { |
119 | { .compatible = "renesas,rzv2m-usb3drd" , }, |
120 | { /* Sentinel */ } |
121 | }; |
122 | MODULE_DEVICE_TABLE(of, rzv2m_usb3drd_of_match); |
123 | |
124 | static 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 | }; |
132 | module_platform_driver(rzv2m_usb3drd_driver); |
133 | |
134 | MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>" ); |
135 | MODULE_DESCRIPTION("Renesas RZ/V2M USB3DRD driver" ); |
136 | MODULE_LICENSE("GPL" ); |
137 | MODULE_ALIAS("platform:rzv2m_usb3drd" ); |
138 | |