140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Renesas RZ/V2M USB3DRD driver
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*
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* Copyright (C) 2022 Renesas Electronics Corporation
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*/
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#include <linux/io.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/reset.h>
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#include <linux/usb/rzv2m_usb3drd.h>
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#define USB_PERI_DRD_CON 0x000
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#define USB_PERI_DRD_CON_PERI_RST BIT(31)
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#define USB_PERI_DRD_CON_HOST_RST BIT(30)
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#define USB_PERI_DRD_CON_PERI_CON BIT(24)
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static void rzv2m_usb3drd_set_bit(struct rzv2m_usb3drd *usb3, u32 bits,
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u32 offs)
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{
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u32 val = readl(usb3->reg + offs);
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val |= bits;
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writel(val, usb3->reg + offs);
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}
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static void rzv2m_usb3drd_clear_bit(struct rzv2m_usb3drd *usb3, u32 bits,
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u32 offs)
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{
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u32 val = readl(usb3->reg + offs);
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val &= ~bits;
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writel(val, usb3->reg + offs);
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}
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void rzv2m_usb3drd_reset(struct device *dev, bool host)
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{
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struct rzv2m_usb3drd *usb3 = dev_get_drvdata(dev);
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if (host) {
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rzv2m_usb3drd_clear_bit(usb3, USB_PERI_DRD_CON_PERI_CON,
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USB_PERI_DRD_CON);
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rzv2m_usb3drd_clear_bit(usb3, USB_PERI_DRD_CON_HOST_RST,
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USB_PERI_DRD_CON);
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rzv2m_usb3drd_set_bit(usb3, USB_PERI_DRD_CON_PERI_RST,
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USB_PERI_DRD_CON);
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} else {
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rzv2m_usb3drd_set_bit(usb3, USB_PERI_DRD_CON_PERI_CON,
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USB_PERI_DRD_CON);
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rzv2m_usb3drd_set_bit(usb3, USB_PERI_DRD_CON_HOST_RST,
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USB_PERI_DRD_CON);
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rzv2m_usb3drd_clear_bit(usb3, USB_PERI_DRD_CON_PERI_RST,
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USB_PERI_DRD_CON);
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}
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}
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EXPORT_SYMBOL_GPL(rzv2m_usb3drd_reset);
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static int rzv2m_usb3drd_remove(struct platform_device *pdev)
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{
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struct rzv2m_usb3drd *usb3 = platform_get_drvdata(pdev);
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of_platform_depopulate(usb3->dev);
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pm_runtime_put(usb3->dev);
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pm_runtime_disable(&pdev->dev);
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reset_control_assert(usb3->drd_rstc);
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return 0;
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}
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static int rzv2m_usb3drd_probe(struct platform_device *pdev)
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{
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struct rzv2m_usb3drd *usb3;
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int ret;
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usb3 = devm_kzalloc(&pdev->dev, sizeof(*usb3), GFP_KERNEL);
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if (!usb3)
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return -ENOMEM;
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usb3->dev = &pdev->dev;
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usb3->drd_irq = platform_get_irq_byname(pdev, "drd");
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if (usb3->drd_irq < 0)
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return usb3->drd_irq;
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usb3->reg = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(usb3->reg))
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return PTR_ERR(usb3->reg);
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platform_set_drvdata(pdev, usb3);
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usb3->drd_rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
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if (IS_ERR(usb3->drd_rstc))
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return dev_err_probe(&pdev->dev, PTR_ERR(usb3->drd_rstc),
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"failed to get drd reset");
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reset_control_deassert(usb3->drd_rstc);
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pm_runtime_enable(&pdev->dev);
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ret = pm_runtime_resume_and_get(usb3->dev);
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if (ret)
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goto err_rst;
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ret = of_platform_populate(usb3->dev->of_node, NULL, NULL, usb3->dev);
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if (ret)
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goto err_pm;
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return 0;
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err_pm:
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pm_runtime_put(usb3->dev);
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err_rst:
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pm_runtime_disable(&pdev->dev);
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reset_control_assert(usb3->drd_rstc);
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return ret;
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}
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static const struct of_device_id rzv2m_usb3drd_of_match[] = {
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{ .compatible = "renesas,rzv2m-usb3drd", },
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{ /* Sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, rzv2m_usb3drd_of_match);
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static struct platform_driver rzv2m_usb3drd_driver = {
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.driver = {
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.name = "rzv2m-usb3drd",
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.of_match_table = of_match_ptr(rzv2m_usb3drd_of_match),
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},
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.probe = rzv2m_usb3drd_probe,
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.remove = rzv2m_usb3drd_remove,
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};
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module_platform_driver(rzv2m_usb3drd_driver);
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MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
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MODULE_DESCRIPTION("Renesas RZ/V2M USB3DRD driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:rzv2m_usb3drd");
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