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The RZ/V2M USB3.1 Gen1 Interface (USB) composed of a USB3.1 Gen1 Dual Role Device controller (USB3DRD), a USB3.1 Gen1 Host controller (USB3HOST), a USB3.1 Gen1 Peripheral controller (USB3PERI). The reset for both host and peri are located in USB3DRD block. The USB3DRD registers are mapped in the AXI address space of the Peripheral module. Add USB3DRD driver to handle reset for both host and peri modules. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Link: https://lore.kernel.org/r/20230121145853.4792-6-biju.das.jz@bp.renesas.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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