1 // SPDX-License-Identifier: GPL-2.0
3 * Renesas RZ/V2M USB3DRD driver
5 * Copyright (C) 2022 Renesas Electronics Corporation
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>
15 #define USB_PERI_DRD_CON 0x000
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)
21 static void rzv2m_usb3drd_set_bit(struct rzv2m_usb3drd *usb3, u32 bits,
24 u32 val = readl(usb3->reg + offs);
27 writel(val, usb3->reg + offs);
30 static void rzv2m_usb3drd_clear_bit(struct rzv2m_usb3drd *usb3, u32 bits,
33 u32 val = readl(usb3->reg + offs);
36 writel(val, usb3->reg + offs);
39 void rzv2m_usb3drd_reset(struct device *dev, bool host)
41 struct rzv2m_usb3drd *usb3 = dev_get_drvdata(dev);
44 rzv2m_usb3drd_clear_bit(usb3, USB_PERI_DRD_CON_PERI_CON,
46 rzv2m_usb3drd_clear_bit(usb3, USB_PERI_DRD_CON_HOST_RST,
48 rzv2m_usb3drd_set_bit(usb3, USB_PERI_DRD_CON_PERI_RST,
51 rzv2m_usb3drd_set_bit(usb3, USB_PERI_DRD_CON_PERI_CON,
53 rzv2m_usb3drd_set_bit(usb3, USB_PERI_DRD_CON_HOST_RST,
55 rzv2m_usb3drd_clear_bit(usb3, USB_PERI_DRD_CON_PERI_RST,
59 EXPORT_SYMBOL_GPL(rzv2m_usb3drd_reset);
61 static void rzv2m_usb3drd_remove(struct platform_device *pdev)
63 struct rzv2m_usb3drd *usb3 = platform_get_drvdata(pdev);
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);
71 static int rzv2m_usb3drd_probe(struct platform_device *pdev)
73 struct rzv2m_usb3drd *usb3;
76 usb3 = devm_kzalloc(&pdev->dev, sizeof(*usb3), GFP_KERNEL);
80 usb3->dev = &pdev->dev;
82 usb3->drd_irq = platform_get_irq_byname(pdev, "drd");
83 if (usb3->drd_irq < 0)
86 usb3->reg = devm_platform_ioremap_resource(pdev, 0);
87 if (IS_ERR(usb3->reg))
88 return PTR_ERR(usb3->reg);
90 platform_set_drvdata(pdev, usb3);
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");
97 reset_control_deassert(usb3->drd_rstc);
98 pm_runtime_enable(&pdev->dev);
99 ret = pm_runtime_resume_and_get(usb3->dev);
103 ret = of_platform_populate(usb3->dev->of_node, NULL, NULL, usb3->dev);
110 pm_runtime_put(usb3->dev);
113 pm_runtime_disable(&pdev->dev);
114 reset_control_assert(usb3->drd_rstc);
118 static const struct of_device_id rzv2m_usb3drd_of_match[] = {
119 { .compatible = "renesas,rzv2m-usb3drd", },
122 MODULE_DEVICE_TABLE(of, rzv2m_usb3drd_of_match);
124 static struct platform_driver rzv2m_usb3drd_driver = {
126 .name = "rzv2m-usb3drd",
127 .of_match_table = rzv2m_usb3drd_of_match,
129 .probe = rzv2m_usb3drd_probe,
130 .remove_new = rzv2m_usb3drd_remove,
132 module_platform_driver(rzv2m_usb3drd_driver);
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");