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
rzv2m_usb3drd_set_bit(struct rzv2m_usb3drd * usb3,u32 bits,u32 offs)21 static 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
rzv2m_usb3drd_clear_bit(struct rzv2m_usb3drd * usb3,u32 bits,u32 offs)30 static 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
rzv2m_usb3drd_reset(struct device * dev,bool host)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
rzv2m_usb3drd_remove(struct platform_device * pdev)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(usb3->dev);
66 pm_runtime_put(usb3->dev);
67 pm_runtime_disable(&pdev->dev);
68 reset_control_assert(usb3->drd_rstc);
69 }
70
rzv2m_usb3drd_probe(struct platform_device * pdev)71 static 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
109 err_pm:
110 pm_runtime_put(usb3->dev);
111
112 err_rst:
113 pm_runtime_disable(&pdev->dev);
114 reset_control_assert(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