u-boot/drivers/power/domain/imx8mp-hsiomix.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2022 Marek Vasut <marex@denx.de>
 */

#include <common.h>
#include <asm/io.h>
#include <clk.h>
#include <dm.h>
#include <dm/device.h>
#include <dm/device_compat.h>
#include <power-domain-uclass.h>

#include <dt-bindings/power/imx8mp-power.h>

#define GPR_REG0		0x0
#define  PCIE_CLOCK_MODULE_EN	BIT(0)
#define  USB_CLOCK_MODULE_EN	BIT(1)

struct imx8mp_hsiomix_priv {
	void __iomem *base;
	struct clk clk_usb;
	struct power_domain pd_bus;
	struct power_domain pd_usb;
	struct power_domain pd_usb_phy1;
	struct power_domain pd_usb_phy2;
};

static int imx8mp_hsiomix_on(struct power_domain *power_domain)
{
	struct udevice *dev = power_domain->dev;
	struct imx8mp_hsiomix_priv *priv = dev_get_priv(dev);
	struct power_domain *domain;
	int ret;

	ret = power_domain_on(&priv->pd_bus);
	if (ret)
		return ret;

	if (power_domain->id == IMX8MP_HSIOBLK_PD_USB) {
		domain = &priv->pd_usb;
	} else if (power_domain->id == IMX8MP_HSIOBLK_PD_USB_PHY1) {
		domain = &priv->pd_usb_phy1;
	} else if (power_domain->id == IMX8MP_HSIOBLK_PD_USB_PHY2) {
		domain = &priv->pd_usb_phy2;
	} else {
		ret = -EINVAL;
		goto err_pd;
	}

	ret = power_domain_on(domain);
	if (ret)
		goto err_pd;

	ret = clk_enable(&priv->clk_usb);
	if (ret)
		goto err_clk;

	if (power_domain->id == IMX8MP_HSIOBLK_PD_USB)
		setbits_le32(priv->base + GPR_REG0, USB_CLOCK_MODULE_EN);

	return 0;

err_clk:
	power_domain_off(domain);
err_pd:
	power_domain_off(&priv->pd_bus);
	return ret;
}

static int imx8mp_hsiomix_off(struct power_domain *power_domain)
{
	struct udevice *dev = power_domain->dev;
	struct imx8mp_hsiomix_priv *priv = dev_get_priv(dev);

	if (power_domain->id == IMX8MP_HSIOBLK_PD_USB)
		clrbits_le32(priv->base + GPR_REG0, USB_CLOCK_MODULE_EN);

	clk_disable(&priv->clk_usb);

	if (power_domain->id == IMX8MP_HSIOBLK_PD_USB)
		power_domain_off(&priv->pd_usb);
	else if (power_domain->id == IMX8MP_HSIOBLK_PD_USB_PHY1)
		power_domain_off(&priv->pd_usb_phy1);
	else if (power_domain->id == IMX8MP_HSIOBLK_PD_USB_PHY2)
		power_domain_off(&priv->pd_usb_phy2);

	power_domain_off(&priv->pd_bus);

	return 0;
}

static int imx8mp_hsiomix_of_xlate(struct power_domain *power_domain,
				   struct ofnode_phandle_args *args)
{
	power_domain->id = args->args[0];

	return 0;
}

static int imx8mp_hsiomix_probe(struct udevice *dev)
{
	struct imx8mp_hsiomix_priv *priv = dev_get_priv(dev);
	int ret;

	priv->base = dev_read_addr_ptr(dev);

	ret = clk_get_by_name(dev, "usb", &priv->clk_usb);
	if (ret < 0)
		return ret;

	ret = power_domain_get_by_name(dev, &priv->pd_bus, "bus");
	if (ret < 0)
		goto err_pd_bus;

	ret = power_domain_get_by_name(dev, &priv->pd_usb, "usb");
	if (ret < 0)
		goto err_pd_usb;

	ret = power_domain_get_by_name(dev, &priv->pd_usb_phy1, "usb-phy1");
	if (ret < 0)
		goto err_pd_usb_phy1;

	ret = power_domain_get_by_name(dev, &priv->pd_usb_phy2, "usb-phy2");
	if (ret < 0)
		goto err_pd_usb_phy2;

	return 0;

err_pd_usb_phy2:
	power_domain_free(&priv->pd_usb_phy1);
err_pd_usb_phy1:
	power_domain_free(&priv->pd_usb);
err_pd_usb:
	power_domain_free(&priv->pd_bus);
err_pd_bus:
	clk_free(&priv->clk_usb);
	return ret;
}

static const struct udevice_id imx8mp_hsiomix_ids[] = {
	{ .compatible = "fsl,imx8mp-hsio-blk-ctrl" },
	{ }
};

struct power_domain_ops imx8mp_hsiomix_ops = {
	.on = imx8mp_hsiomix_on,
	.off = imx8mp_hsiomix_off,
	.of_xlate = imx8mp_hsiomix_of_xlate,
};

U_BOOT_DRIVER(imx8mp_hsiomix) = {
	.name		= "imx8mp_hsiomix",
	.id		= UCLASS_POWER_DOMAIN,
	.of_match	= imx8mp_hsiomix_ids,
	.probe		= imx8mp_hsiomix_probe,
	.priv_auto	= sizeof(struct imx8mp_hsiomix_priv),
	.ops		= &imx8mp_hsiomix_ops,
};