drivers/power/domain/mtk-power-domain.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2018 MediaTek Inc.
  * Author: Ryder Lee <ryder.lee@mediatek.com>
  */

 #include <clk.h>
 #include <common.h>
 #include <dm.h>
 #include <power-domain-uclass.h>
 #include <regmap.h>
 #include <syscon.h>
 #include <asm/io.h>
 #include <asm/processor.h>
 #include <linux/iopoll.h>

 #include <dt-bindings/power/mt7623-power.h>
 #include <dt-bindings/power/mt7629-power.h>

 #define SPM_EN			(0xb16 << 16 | 0x1)
 #define SPM_VDE_PWR_CON		0x0210
 #define SPM_MFG_PWR_CON		0x0214
 #define SPM_ISP_PWR_CON		0x0238
 #define SPM_DIS_PWR_CON		0x023c
 #define SPM_CONN_PWR_CON	0x0280
 #define SPM_BDP_PWR_CON		0x029c
 #define SPM_ETH_PWR_CON		0x02a0
 #define SPM_HIF_PWR_CON		0x02a4
 #define SPM_IFR_MSC_PWR_CON	0x02a8
 #define SPM_ETHSYS_PWR_CON	0x2e0
 #define SPM_HIF0_PWR_CON	0x2e4
 #define SPM_HIF1_PWR_CON	0x2e8
 #define SPM_PWR_STATUS		0x60c
 #define SPM_PWR_STATUS_2ND	0x610

 #define PWR_RST_B_BIT		BIT(0)
 #define PWR_ISO_BIT		BIT(1)
 #define PWR_ON_BIT		BIT(2)
 #define PWR_ON_2ND_BIT		BIT(3)
 #define PWR_CLK_DIS_BIT		BIT(4)

 #define PWR_STATUS_CONN		BIT(1)
 #define PWR_STATUS_DISP		BIT(3)
 #define PWR_STATUS_MFG		BIT(4)
 #define PWR_STATUS_ISP		BIT(5)
 #define PWR_STATUS_VDEC		BIT(7)
 #define PWR_STATUS_BDP		BIT(14)
 #define PWR_STATUS_ETH		BIT(15)
 #define PWR_STATUS_HIF		BIT(16)
 #define PWR_STATUS_IFR_MSC	BIT(17)
 #define PWR_STATUS_ETHSYS	BIT(24)
 #define PWR_STATUS_HIF0		BIT(25)
 #define PWR_STATUS_HIF1		BIT(26)

 /* Infrasys configuration */
 #define INFRA_TOPDCM_CTRL	0x10
 #define INFRA_TOPAXI_PROT_EN	0x220
 #define INFRA_TOPAXI_PROT_STA1	0x228

 #define DCM_TOP_EN		BIT(0)

 enum scp_domain_type {
 	SCPSYS_MT7622,
 	SCPSYS_MT7623,
 	SCPSYS_MT7629,
 };

 struct scp_domain;

 struct scp_domain_data {
 	struct scp_domain *scpd;
 	u32 sta_mask;
 	int ctl_offs;
 	u32 sram_pdn_bits;
 	u32 sram_pdn_ack_bits;
 	u32 bus_prot_mask;
 };

 struct scp_domain {
 	void __iomem *base;
 	void __iomem *infracfg;
 	enum scp_domain_type type;
 	struct scp_domain_data *data;
 };

 static struct scp_domain_data scp_domain_mt7623[] = {
 	[MT7623_POWER_DOMAIN_CONN] = {
 		.sta_mask = PWR_STATUS_CONN,
 		.ctl_offs = SPM_CONN_PWR_CON,
 		.bus_prot_mask = BIT(8) | BIT(2),
 	},
 	[MT7623_POWER_DOMAIN_DISP] = {
 		.sta_mask = PWR_STATUS_DISP,
 		.ctl_offs = SPM_DIS_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.bus_prot_mask = BIT(2),
 	},
 	[MT7623_POWER_DOMAIN_MFG] = {
 		.sta_mask = PWR_STATUS_MFG,
 		.ctl_offs = SPM_MFG_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(12, 12),
 	},
 	[MT7623_POWER_DOMAIN_VDEC] = {
 		.sta_mask = PWR_STATUS_VDEC,
 		.ctl_offs = SPM_VDE_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(12, 12),
 	},
 	[MT7623_POWER_DOMAIN_ISP] = {
 		.sta_mask = PWR_STATUS_ISP,
 		.ctl_offs = SPM_ISP_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(13, 12),
 	},
 	[MT7623_POWER_DOMAIN_BDP] = {
 		.sta_mask = PWR_STATUS_BDP,
 		.ctl_offs = SPM_BDP_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 	},
 	[MT7623_POWER_DOMAIN_ETH] = {
 		.sta_mask = PWR_STATUS_ETH,
 		.ctl_offs = SPM_ETH_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 	},
 	[MT7623_POWER_DOMAIN_HIF] = {
 		.sta_mask = PWR_STATUS_HIF,
 		.ctl_offs = SPM_HIF_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 	},
 	[MT7623_POWER_DOMAIN_IFR_MSC] = {
 		.sta_mask = PWR_STATUS_IFR_MSC,
 		.ctl_offs = SPM_IFR_MSC_PWR_CON,
 	},
 };

 static struct scp_domain_data scp_domain_mt7629[] = {
 	[MT7629_POWER_DOMAIN_ETHSYS] = {
 		.sta_mask = PWR_STATUS_ETHSYS,
 		.ctl_offs = SPM_ETHSYS_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 		.bus_prot_mask = (BIT(3) | BIT(17)),
 	},
 	[MT7629_POWER_DOMAIN_HIF0] = {
 		.sta_mask = PWR_STATUS_HIF0,
 		.ctl_offs = SPM_HIF0_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 		.bus_prot_mask = GENMASK(25, 24),
 	},
 	[MT7629_POWER_DOMAIN_HIF1] = {
 		.sta_mask = PWR_STATUS_HIF1,
 		.ctl_offs = SPM_HIF1_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 		.bus_prot_mask = GENMASK(28, 26),
 	},
 };

 /**
  * This function enables the bus protection bits for disabled power
  * domains so that the system does not hang when some unit accesses the
  * bus while in power down.
  */
 static int mtk_infracfg_set_bus_protection(void __iomem *infracfg,
 					   u32 mask)
 {
 	u32 val;

 	clrsetbits_le32(infracfg + INFRA_TOPAXI_PROT_EN, mask, mask);

 	return readl_poll_timeout(infracfg + INFRA_TOPAXI_PROT_STA1, val,
 				  (val & mask) == mask, 100);
 }

 static int mtk_infracfg_clear_bus_protection(void __iomem *infracfg,
 					     u32 mask)
 {
 	u32 val;

 	clrbits_le32(infracfg + INFRA_TOPAXI_PROT_EN, mask);

 	return readl_poll_timeout(infracfg + INFRA_TOPAXI_PROT_STA1, val,
 				  !(val & mask), 100);
 }

 static int scpsys_domain_is_on(struct scp_domain_data *data)
 {
 	struct scp_domain *scpd = data->scpd;
 	u32 sta = readl(scpd->base + SPM_PWR_STATUS) &
 			data->sta_mask;
 	u32 sta2 = readl(scpd->base + SPM_PWR_STATUS_2ND) &
 			 data->sta_mask;

 	/*
 	 * A domain is on when both status bits are set. If only one is set
 	 * return an error. This happens while powering up a domain
 	 */
 	if (sta && sta2)
 		return true;
 	if (!sta && !sta2)
 		return false;

 	return -EINVAL;
 }

 static int scpsys_power_on(struct power_domain *power_domain)
 {
 	struct scp_domain *scpd = dev_get_priv(power_domain->dev);
 	struct scp_domain_data *data = &scpd->data[power_domain->id];
 	void __iomem *ctl_addr = scpd->base + data->ctl_offs;
 	u32 pdn_ack = data->sram_pdn_ack_bits;
 	u32 val;
 	int ret, tmp;

 	writel(SPM_EN, scpd->base);

 	val = readl(ctl_addr);
 	val |= PWR_ON_BIT;
 	writel(val, ctl_addr);

 	val |= PWR_ON_2ND_BIT;
 	writel(val, ctl_addr);

 	ret = readx_poll_timeout(scpsys_domain_is_on, data, tmp, tmp > 0,
 				 100);
 	if (ret < 0)
 		return ret;

 	val &= ~PWR_CLK_DIS_BIT;
 	writel(val, ctl_addr);

 	val &= ~PWR_ISO_BIT;
 	writel(val, ctl_addr);

 	val |= PWR_RST_B_BIT;
 	writel(val, ctl_addr);

 	val &= ~data->sram_pdn_bits;
 	writel(val, ctl_addr);

 	ret = readl_poll_timeout(ctl_addr, tmp, !(tmp & pdn_ack), 100);
 	if (ret < 0)
 		return ret;

 	if (data->bus_prot_mask) {
 		ret = mtk_infracfg_clear_bus_protection(scpd->infracfg,
 							data->bus_prot_mask);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static int scpsys_power_off(struct power_domain *power_domain)
 {
 	struct scp_domain *scpd = dev_get_priv(power_domain->dev);
 	struct scp_domain_data *data = &scpd->data[power_domain->id];
 	void __iomem *ctl_addr = scpd->base + data->ctl_offs;
 	u32 pdn_ack = data->sram_pdn_ack_bits;
 	u32 val;
 	int ret, tmp;

 	if (data->bus_prot_mask) {
 		ret = mtk_infracfg_set_bus_protection(scpd->infracfg,
 						      data->bus_prot_mask);
 		if (ret)
 			return ret;
 	}

 	val = readl(ctl_addr);
 	val |= data->sram_pdn_bits;
 	writel(val, ctl_addr);

 	ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == pdn_ack,
 				 100);
 	if (ret < 0)
 		return ret;

 	val |= PWR_ISO_BIT;
 	writel(val, ctl_addr);

 	val &= ~PWR_RST_B_BIT;
 	writel(val, ctl_addr);

 	val |= PWR_CLK_DIS_BIT;
 	writel(val, ctl_addr);

 	val &= ~PWR_ON_BIT;
 	writel(val, ctl_addr);

 	val &= ~PWR_ON_2ND_BIT;
 	writel(val, ctl_addr);

 	ret = readx_poll_timeout(scpsys_domain_is_on, data, tmp, !tmp, 100);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int scpsys_power_request(struct power_domain *power_domain)
 {
 	struct scp_domain *scpd = dev_get_priv(power_domain->dev);
 	struct scp_domain_data *data;

 	data = &scpd->data[power_domain->id];
 	data->scpd = scpd;

 	return 0;
 }

 static int scpsys_power_free(struct power_domain *power_domain)
 {
 	return 0;
 }

 static int mtk_power_domain_hook(struct udevice *dev)
 {
 	struct scp_domain *scpd = dev_get_priv(dev);

 	scpd->type = (enum scp_domain_type)dev_get_driver_data(dev);

 	switch (scpd->type) {
 	case SCPSYS_MT7623:
 		scpd->data = scp_domain_mt7623;
 		break;
 	case SCPSYS_MT7622:
 	case SCPSYS_MT7629:
 		scpd->data = scp_domain_mt7629;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int mtk_power_domain_probe(struct udevice *dev)
 {
 	struct ofnode_phandle_args args;
 	struct scp_domain *scpd = dev_get_priv(dev);
 	struct regmap *regmap;
 	struct clk_bulk bulk;
 	int err;

 	scpd->base = dev_read_addr_ptr(dev);
 	if (!scpd->base)
 		return -ENOENT;

 	err = mtk_power_domain_hook(dev);
 	if (err)
 		return err;

 	/* get corresponding syscon phandle */
 	err = dev_read_phandle_with_args(dev, "infracfg", NULL, 0, 0, &args);
 	if (err)
 		return err;

 	regmap = syscon_node_to_regmap(args.node);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);

 	scpd->infracfg = regmap_get_range(regmap, 0);
 	if (!scpd->infracfg)
 		return -ENOENT;

 	/* enable Infra DCM */
 	setbits_le32(scpd->infracfg + INFRA_TOPDCM_CTRL, DCM_TOP_EN);

 	err = clk_get_bulk(dev, &bulk);
 	if (err)
 		return err;

 	return clk_enable_bulk(&bulk);
 }

 static const struct udevice_id mtk_power_domain_ids[] = {
 	{
 		.compatible = "mediatek,mt7622-scpsys",
 		.data = SCPSYS_MT7622,
 	},
 	{
 		.compatible = "mediatek,mt7623-scpsys",
 		.data = SCPSYS_MT7623,
 	},
 	{
 		.compatible = "mediatek,mt7629-scpsys",
 		.data = SCPSYS_MT7629,
 	},
 	{ /* sentinel */ }
 };

 struct power_domain_ops mtk_power_domain_ops = {
 	.free = scpsys_power_free,
 	.off = scpsys_power_off,
 	.on = scpsys_power_on,
 	.request = scpsys_power_request,
 };

 U_BOOT_DRIVER(mtk_power_domain) = {
 	.name = "mtk_power_domain",
 	.id = UCLASS_POWER_DOMAIN,
 	.ops = &mtk_power_domain_ops,
 	.probe = mtk_power_domain_probe,
 	.of_match = mtk_power_domain_ids,
 	.priv_auto_alloc_size = sizeof(struct scp_domain),
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2018 MediaTek Inc.
	* Author: Ryder Lee <ryder.lee@mediatek.com>
	*/

	#include <clk.h>
	#include <common.h>
	#include <dm.h>
	#include <power-domain-uclass.h>
	#include <regmap.h>
	#include <syscon.h>
	#include <asm/io.h>
	#include <asm/processor.h>
	#include <linux/iopoll.h>

	#include <dt-bindings/power/mt7623-power.h>
	#include <dt-bindings/power/mt7629-power.h>

	#define SPM_EN (0xb16 << 16 \| 0x1)
	#define SPM_VDE_PWR_CON 0x0210
	#define SPM_MFG_PWR_CON 0x0214
	#define SPM_ISP_PWR_CON 0x0238
	#define SPM_DIS_PWR_CON 0x023c
	#define SPM_CONN_PWR_CON 0x0280
	#define SPM_BDP_PWR_CON 0x029c
	#define SPM_ETH_PWR_CON 0x02a0
	#define SPM_HIF_PWR_CON 0x02a4
	#define SPM_IFR_MSC_PWR_CON 0x02a8
	#define SPM_ETHSYS_PWR_CON 0x2e0
	#define SPM_HIF0_PWR_CON 0x2e4
	#define SPM_HIF1_PWR_CON 0x2e8
	#define SPM_PWR_STATUS 0x60c
	#define SPM_PWR_STATUS_2ND 0x610

	#define PWR_RST_B_BIT BIT(0)
	#define PWR_ISO_BIT BIT(1)
	#define PWR_ON_BIT BIT(2)
	#define PWR_ON_2ND_BIT BIT(3)
	#define PWR_CLK_DIS_BIT BIT(4)

	#define PWR_STATUS_CONN BIT(1)
	#define PWR_STATUS_DISP BIT(3)
	#define PWR_STATUS_MFG BIT(4)
	#define PWR_STATUS_ISP BIT(5)
	#define PWR_STATUS_VDEC BIT(7)
	#define PWR_STATUS_BDP BIT(14)
	#define PWR_STATUS_ETH BIT(15)
	#define PWR_STATUS_HIF BIT(16)
	#define PWR_STATUS_IFR_MSC BIT(17)
	#define PWR_STATUS_ETHSYS BIT(24)
	#define PWR_STATUS_HIF0 BIT(25)
	#define PWR_STATUS_HIF1 BIT(26)

	/* Infrasys configuration */
	#define INFRA_TOPDCM_CTRL 0x10
	#define INFRA_TOPAXI_PROT_EN 0x220
	#define INFRA_TOPAXI_PROT_STA1 0x228

	#define DCM_TOP_EN BIT(0)

	enum scp_domain_type {
	SCPSYS_MT7622,
	SCPSYS_MT7623,
	SCPSYS_MT7629,
	};

	struct scp_domain;

	struct scp_domain_data {
	struct scp_domain *scpd;
	u32 sta_mask;
	int ctl_offs;
	u32 sram_pdn_bits;
	u32 sram_pdn_ack_bits;
	u32 bus_prot_mask;
	};

	struct scp_domain {
	void __iomem *base;
	void __iomem *infracfg;
	enum scp_domain_type type;
	struct scp_domain_data *data;
	};

	static struct scp_domain_data scp_domain_mt7623[] = {
	[MT7623_POWER_DOMAIN_CONN] = {
	.sta_mask = PWR_STATUS_CONN,
	.ctl_offs = SPM_CONN_PWR_CON,
	.bus_prot_mask = BIT(8) \| BIT(2),
	},
	[MT7623_POWER_DOMAIN_DISP] = {
	.sta_mask = PWR_STATUS_DISP,
	.ctl_offs = SPM_DIS_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.bus_prot_mask = BIT(2),
	},
	[MT7623_POWER_DOMAIN_MFG] = {
	.sta_mask = PWR_STATUS_MFG,
	.ctl_offs = SPM_MFG_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(12, 12),
	},
	[MT7623_POWER_DOMAIN_VDEC] = {
	.sta_mask = PWR_STATUS_VDEC,
	.ctl_offs = SPM_VDE_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(12, 12),
	},
	[MT7623_POWER_DOMAIN_ISP] = {
	.sta_mask = PWR_STATUS_ISP,
	.ctl_offs = SPM_ISP_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(13, 12),
	},
	[MT7623_POWER_DOMAIN_BDP] = {
	.sta_mask = PWR_STATUS_BDP,
	.ctl_offs = SPM_BDP_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	},
	[MT7623_POWER_DOMAIN_ETH] = {
	.sta_mask = PWR_STATUS_ETH,
	.ctl_offs = SPM_ETH_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(15, 12),
	},
	[MT7623_POWER_DOMAIN_HIF] = {
	.sta_mask = PWR_STATUS_HIF,
	.ctl_offs = SPM_HIF_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(15, 12),
	},
	[MT7623_POWER_DOMAIN_IFR_MSC] = {
	.sta_mask = PWR_STATUS_IFR_MSC,
	.ctl_offs = SPM_IFR_MSC_PWR_CON,
	},
	};

	static struct scp_domain_data scp_domain_mt7629[] = {
	[MT7629_POWER_DOMAIN_ETHSYS] = {
	.sta_mask = PWR_STATUS_ETHSYS,
	.ctl_offs = SPM_ETHSYS_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(15, 12),
	.bus_prot_mask = (BIT(3) \| BIT(17)),
	},
	[MT7629_POWER_DOMAIN_HIF0] = {
	.sta_mask = PWR_STATUS_HIF0,
	.ctl_offs = SPM_HIF0_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(15, 12),
	.bus_prot_mask = GENMASK(25, 24),
	},
	[MT7629_POWER_DOMAIN_HIF1] = {
	.sta_mask = PWR_STATUS_HIF1,
	.ctl_offs = SPM_HIF1_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(15, 12),
	.bus_prot_mask = GENMASK(28, 26),
	},
	};

	/**
	* This function enables the bus protection bits for disabled power
	* domains so that the system does not hang when some unit accesses the
	* bus while in power down.
	*/
	static int mtk_infracfg_set_bus_protection(void __iomem *infracfg,
	u32 mask)
	{
	u32 val;

	clrsetbits_le32(infracfg + INFRA_TOPAXI_PROT_EN, mask, mask);

	return readl_poll_timeout(infracfg + INFRA_TOPAXI_PROT_STA1, val,
	(val & mask) == mask, 100);
	}

	static int mtk_infracfg_clear_bus_protection(void __iomem *infracfg,
	u32 mask)
	{
	u32 val;

	clrbits_le32(infracfg + INFRA_TOPAXI_PROT_EN, mask);

	return readl_poll_timeout(infracfg + INFRA_TOPAXI_PROT_STA1, val,
	!(val & mask), 100);
	}

	static int scpsys_domain_is_on(struct scp_domain_data *data)
	{
	struct scp_domain *scpd = data->scpd;
	u32 sta = readl(scpd->base + SPM_PWR_STATUS) &
	data->sta_mask;
	u32 sta2 = readl(scpd->base + SPM_PWR_STATUS_2ND) &
	data->sta_mask;

	/*
	* A domain is on when both status bits are set. If only one is set
	* return an error. This happens while powering up a domain
	*/
	if (sta && sta2)
	return true;
	if (!sta && !sta2)
	return false;

	return -EINVAL;
	}

	static int scpsys_power_on(struct power_domain *power_domain)
	{
	struct scp_domain *scpd = dev_get_priv(power_domain->dev);
	struct scp_domain_data *data = &scpd->data[power_domain->id];
	void __iomem *ctl_addr = scpd->base + data->ctl_offs;
	u32 pdn_ack = data->sram_pdn_ack_bits;
	u32 val;
	int ret, tmp;

	writel(SPM_EN, scpd->base);

	val = readl(ctl_addr);
	val \|= PWR_ON_BIT;
	writel(val, ctl_addr);

	val \|= PWR_ON_2ND_BIT;
	writel(val, ctl_addr);

	ret = readx_poll_timeout(scpsys_domain_is_on, data, tmp, tmp > 0,
	100);
	if (ret < 0)
	return ret;

	val &= ~PWR_CLK_DIS_BIT;
	writel(val, ctl_addr);

	val &= ~PWR_ISO_BIT;
	writel(val, ctl_addr);

	val \|= PWR_RST_B_BIT;
	writel(val, ctl_addr);

	val &= ~data->sram_pdn_bits;
	writel(val, ctl_addr);

	ret = readl_poll_timeout(ctl_addr, tmp, !(tmp & pdn_ack), 100);
	if (ret < 0)
	return ret;

	if (data->bus_prot_mask) {
	ret = mtk_infracfg_clear_bus_protection(scpd->infracfg,
	data->bus_prot_mask);
	if (ret)
	return ret;
	}

	return 0;
	}

	static int scpsys_power_off(struct power_domain *power_domain)
	{
	struct scp_domain *scpd = dev_get_priv(power_domain->dev);
	struct scp_domain_data *data = &scpd->data[power_domain->id];
	void __iomem *ctl_addr = scpd->base + data->ctl_offs;
	u32 pdn_ack = data->sram_pdn_ack_bits;
	u32 val;
	int ret, tmp;

	if (data->bus_prot_mask) {
	ret = mtk_infracfg_set_bus_protection(scpd->infracfg,
	data->bus_prot_mask);
	if (ret)
	return ret;
	}

	val = readl(ctl_addr);
	val \|= data->sram_pdn_bits;
	writel(val, ctl_addr);

	ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == pdn_ack,
	100);
	if (ret < 0)
	return ret;

	val \|= PWR_ISO_BIT;
	writel(val, ctl_addr);

	val &= ~PWR_RST_B_BIT;
	writel(val, ctl_addr);

	val \|= PWR_CLK_DIS_BIT;
	writel(val, ctl_addr);

	val &= ~PWR_ON_BIT;
	writel(val, ctl_addr);

	val &= ~PWR_ON_2ND_BIT;
	writel(val, ctl_addr);

	ret = readx_poll_timeout(scpsys_domain_is_on, data, tmp, !tmp, 100);
	if (ret < 0)
	return ret;

	return 0;
	}

	static int scpsys_power_request(struct power_domain *power_domain)
	{
	struct scp_domain *scpd = dev_get_priv(power_domain->dev);
	struct scp_domain_data *data;

	data = &scpd->data[power_domain->id];
	data->scpd = scpd;

	return 0;
	}

	static int scpsys_power_free(struct power_domain *power_domain)
	{
	return 0;
	}

	static int mtk_power_domain_hook(struct udevice *dev)
	{
	struct scp_domain *scpd = dev_get_priv(dev);

	scpd->type = (enum scp_domain_type)dev_get_driver_data(dev);

	switch (scpd->type) {
	case SCPSYS_MT7623:
	scpd->data = scp_domain_mt7623;
	break;
	case SCPSYS_MT7622:
	case SCPSYS_MT7629:
	scpd->data = scp_domain_mt7629;
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int mtk_power_domain_probe(struct udevice *dev)
	{
	struct ofnode_phandle_args args;
	struct scp_domain *scpd = dev_get_priv(dev);
	struct regmap *regmap;
	struct clk_bulk bulk;
	int err;

	scpd->base = dev_read_addr_ptr(dev);
	if (!scpd->base)
	return -ENOENT;

	err = mtk_power_domain_hook(dev);
	if (err)
	return err;

	/* get corresponding syscon phandle */
	err = dev_read_phandle_with_args(dev, "infracfg", NULL, 0, 0, &args);
	if (err)
	return err;

	regmap = syscon_node_to_regmap(args.node);
	if (IS_ERR(regmap))
	return PTR_ERR(regmap);

	scpd->infracfg = regmap_get_range(regmap, 0);
	if (!scpd->infracfg)
	return -ENOENT;

	/* enable Infra DCM */
	setbits_le32(scpd->infracfg + INFRA_TOPDCM_CTRL, DCM_TOP_EN);

	err = clk_get_bulk(dev, &bulk);
	if (err)
	return err;

	return clk_enable_bulk(&bulk);
	}

	static const struct udevice_id mtk_power_domain_ids[] = {
	{
	.compatible = "mediatek,mt7622-scpsys",
	.data = SCPSYS_MT7622,
	},
	{
	.compatible = "mediatek,mt7623-scpsys",
	.data = SCPSYS_MT7623,
	},
	{
	.compatible = "mediatek,mt7629-scpsys",
	.data = SCPSYS_MT7629,
	},
	{ /* sentinel */ }
	};

	struct power_domain_ops mtk_power_domain_ops = {
	.free = scpsys_power_free,
	.off = scpsys_power_off,
	.on = scpsys_power_on,
	.request = scpsys_power_request,
	};

	U_BOOT_DRIVER(mtk_power_domain) = {
	.name = "mtk_power_domain",
	.id = UCLASS_POWER_DOMAIN,
	.ops = &mtk_power_domain_ops,
	.probe = mtk_power_domain_probe,
	.of_match = mtk_power_domain_ids,
	.priv_auto_alloc_size = sizeof(struct scp_domain),
	};