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