drivers/soc/mediatek/mtk-scpsys.c - linux - Git at Google

 /*
  * Copyright (c) 2015 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
 #include <linux/init.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/regmap.h>
 #include <linux/soc/mediatek/infracfg.h>
 #include <linux/regulator/consumer.h>
 #include <dt-bindings/power/mt8173-power.h>

 #define SPM_VDE_PWR_CON			0x0210
 #define SPM_MFG_PWR_CON			0x0214
 #define SPM_VEN_PWR_CON			0x0230
 #define SPM_ISP_PWR_CON			0x0238
 #define SPM_DIS_PWR_CON			0x023c
 #define SPM_VEN2_PWR_CON		0x0298
 #define SPM_AUDIO_PWR_CON		0x029c
 #define SPM_MFG_2D_PWR_CON		0x02c0
 #define SPM_MFG_ASYNC_PWR_CON		0x02c4
 #define SPM_USB_PWR_CON			0x02cc
 #define SPM_PWR_STATUS			0x060c
 #define SPM_PWR_STATUS_2ND		0x0610

 #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_DISP			BIT(3)
 #define PWR_STATUS_MFG			BIT(4)
 #define PWR_STATUS_ISP			BIT(5)
 #define PWR_STATUS_VDEC			BIT(7)
 #define PWR_STATUS_VENC_LT		BIT(20)
 #define PWR_STATUS_VENC			BIT(21)
 #define PWR_STATUS_MFG_2D		BIT(22)
 #define PWR_STATUS_MFG_ASYNC		BIT(23)
 #define PWR_STATUS_AUDIO		BIT(24)
 #define PWR_STATUS_USB			BIT(25)

 enum clk_id {
 	MT8173_CLK_NONE,
 	MT8173_CLK_MM,
 	MT8173_CLK_MFG,
 	MT8173_CLK_VENC,
 	MT8173_CLK_VENC_LT,
 	MT8173_CLK_MAX,
 };

 #define MAX_CLKS	2

 struct scp_domain_data {
 	const char *name;
 	u32 sta_mask;
 	int ctl_offs;
 	u32 sram_pdn_bits;
 	u32 sram_pdn_ack_bits;
 	u32 bus_prot_mask;
 	enum clk_id clk_id[MAX_CLKS];
 	bool active_wakeup;
 };

 static const struct scp_domain_data scp_domain_data[] = {
 	[MT8173_POWER_DOMAIN_VDEC] = {
 		.name = "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),
 		.clk_id = {MT8173_CLK_MM},
 	},
 	[MT8173_POWER_DOMAIN_VENC] = {
 		.name = "venc",
 		.sta_mask = PWR_STATUS_VENC,
 		.ctl_offs = SPM_VEN_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 		.clk_id = {MT8173_CLK_MM, MT8173_CLK_VENC},
 	},
 	[MT8173_POWER_DOMAIN_ISP] = {
 		.name = "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),
 		.clk_id = {MT8173_CLK_MM},
 	},
 	[MT8173_POWER_DOMAIN_MM] = {
 		.name = "mm",
 		.sta_mask = PWR_STATUS_DISP,
 		.ctl_offs = SPM_DIS_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(12, 12),
 		.clk_id = {MT8173_CLK_MM},
 		.bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MM_M0 |
 			MT8173_TOP_AXI_PROT_EN_MM_M1,
 	},
 	[MT8173_POWER_DOMAIN_VENC_LT] = {
 		.name = "venc_lt",
 		.sta_mask = PWR_STATUS_VENC_LT,
 		.ctl_offs = SPM_VEN2_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 		.clk_id = {MT8173_CLK_MM, MT8173_CLK_VENC_LT},
 	},
 	[MT8173_POWER_DOMAIN_AUDIO] = {
 		.name = "audio",
 		.sta_mask = PWR_STATUS_AUDIO,
 		.ctl_offs = SPM_AUDIO_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 		.clk_id = {MT8173_CLK_NONE},
 	},
 	[MT8173_POWER_DOMAIN_USB] = {
 		.name = "usb",
 		.sta_mask = PWR_STATUS_USB,
 		.ctl_offs = SPM_USB_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 		.clk_id = {MT8173_CLK_NONE},
 		.active_wakeup = true,
 	},
 	[MT8173_POWER_DOMAIN_MFG_ASYNC] = {
 		.name = "mfg_async",
 		.sta_mask = PWR_STATUS_MFG_ASYNC,
 		.ctl_offs = SPM_MFG_ASYNC_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = 0,
 		.clk_id = {MT8173_CLK_MFG},
 	},
 	[MT8173_POWER_DOMAIN_MFG_2D] = {
 		.name = "mfg_2d",
 		.sta_mask = PWR_STATUS_MFG_2D,
 		.ctl_offs = SPM_MFG_2D_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(13, 12),
 		.clk_id = {MT8173_CLK_NONE},
 	},
 	[MT8173_POWER_DOMAIN_MFG] = {
 		.name = "mfg",
 		.sta_mask = PWR_STATUS_MFG,
 		.ctl_offs = SPM_MFG_PWR_CON,
 		.sram_pdn_bits = GENMASK(13, 8),
 		.sram_pdn_ack_bits = GENMASK(21, 16),
 		.clk_id = {MT8173_CLK_NONE},
 		.bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MFG_S |
 			MT8173_TOP_AXI_PROT_EN_MFG_M0 |
 			MT8173_TOP_AXI_PROT_EN_MFG_M1 |
 			MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT,
 	},
 };

 #define NUM_DOMAINS	ARRAY_SIZE(scp_domain_data)

 struct scp;

 struct scp_domain {
 	struct generic_pm_domain genpd;
 	struct scp *scp;
 	struct clk *clk[MAX_CLKS];
 	const struct scp_domain_data *data;
 	struct regulator *supply;
 };

 struct scp {
 	struct scp_domain domains[NUM_DOMAINS];
 	struct genpd_onecell_data pd_data;
 	struct device *dev;
 	void __iomem *base;
 	struct regmap *infracfg;
 };

 static int scpsys_domain_is_on(struct scp_domain *scpd)
 {
 	struct scp *scp = scpd->scp;

 	u32 status = readl(scp->base + SPM_PWR_STATUS) & scpd->data->sta_mask;
 	u32 status2 = readl(scp->base + SPM_PWR_STATUS_2ND) &
 				scpd->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 (status && status2)
 		return true;
 	if (!status && !status2)
 		return false;

 	return -EINVAL;
 }

 static int scpsys_power_on(struct generic_pm_domain *genpd)
 {
 	struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
 	struct scp *scp = scpd->scp;
 	unsigned long timeout;
 	bool expired;
 	void __iomem *ctl_addr = scp->base + scpd->data->ctl_offs;
 	u32 sram_pdn_ack = scpd->data->sram_pdn_ack_bits;
 	u32 val;
 	int ret;
 	int i;

 	if (scpd->supply) {
 		ret = regulator_enable(scpd->supply);
 		if (ret)
 			return ret;
 	}

 	for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++) {
 		ret = clk_prepare_enable(scpd->clk[i]);
 		if (ret) {
 			for (--i; i >= 0; i--)
 				clk_disable_unprepare(scpd->clk[i]);

 			goto err_clk;
 		}
 	}

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

 	/* wait until PWR_ACK = 1 */
 	timeout = jiffies + HZ;
 	expired = false;
 	while (1) {
 		ret = scpsys_domain_is_on(scpd);
 		if (ret > 0)
 			break;

 		if (expired) {
 			ret = -ETIMEDOUT;
 			goto err_pwr_ack;
 		}

 		cpu_relax();

 		if (time_after(jiffies, timeout))
 			expired = true;
 	}

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

 	/* wait until SRAM_PDN_ACK all 0 */
 	timeout = jiffies + HZ;
 	expired = false;
 	while (sram_pdn_ack && (readl(ctl_addr) & sram_pdn_ack)) {

 		if (expired) {
 			ret = -ETIMEDOUT;
 			goto err_pwr_ack;
 		}

 		cpu_relax();

 		if (time_after(jiffies, timeout))
 			expired = true;
 	}

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

 	return 0;

 err_pwr_ack:
 	for (i = MAX_CLKS - 1; i >= 0; i--) {
 		if (scpd->clk[i])
 			clk_disable_unprepare(scpd->clk[i]);
 	}
 err_clk:
 	if (scpd->supply)
 		regulator_disable(scpd->supply);

 	dev_err(scp->dev, "Failed to power on domain %s\n", genpd->name);

 	return ret;
 }

 static int scpsys_power_off(struct generic_pm_domain *genpd)
 {
 	struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
 	struct scp *scp = scpd->scp;
 	unsigned long timeout;
 	bool expired;
 	void __iomem *ctl_addr = scp->base + scpd->data->ctl_offs;
 	u32 pdn_ack = scpd->data->sram_pdn_ack_bits;
 	u32 val;
 	int ret;
 	int i;

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

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

 	/* wait until SRAM_PDN_ACK all 1 */
 	timeout = jiffies + HZ;
 	expired = false;
 	while (pdn_ack && (readl(ctl_addr) & pdn_ack) != pdn_ack) {
 		if (expired) {
 			ret = -ETIMEDOUT;
 			goto out;
 		}

 		cpu_relax();

 		if (time_after(jiffies, timeout))
 			expired = true;
 	}

 	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);

 	/* wait until PWR_ACK = 0 */
 	timeout = jiffies + HZ;
 	expired = false;
 	while (1) {
 		ret = scpsys_domain_is_on(scpd);
 		if (ret == 0)
 			break;

 		if (expired) {
 			ret = -ETIMEDOUT;
 			goto out;
 		}

 		cpu_relax();

 		if (time_after(jiffies, timeout))
 			expired = true;
 	}

 	for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++)
 		clk_disable_unprepare(scpd->clk[i]);

 	if (scpd->supply)
 		regulator_disable(scpd->supply);

 	return 0;

 out:
 	dev_err(scp->dev, "Failed to power off domain %s\n", genpd->name);

 	return ret;
 }

 static bool scpsys_active_wakeup(struct device *dev)
 {
 	struct generic_pm_domain *genpd;
 	struct scp_domain *scpd;

 	genpd = pd_to_genpd(dev->pm_domain);
 	scpd = container_of(genpd, struct scp_domain, genpd);

 	return scpd->data->active_wakeup;
 }

 static int scpsys_probe(struct platform_device *pdev)
 {
 	struct genpd_onecell_data *pd_data;
 	struct resource *res;
 	int i, j, ret;
 	struct scp *scp;
 	struct clk *clk[MT8173_CLK_MAX];

 	scp = devm_kzalloc(&pdev->dev, sizeof(*scp), GFP_KERNEL);
 	if (!scp)
 		return -ENOMEM;

 	scp->dev = &pdev->dev;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	scp->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(scp->base))
 		return PTR_ERR(scp->base);

 	pd_data = &scp->pd_data;

 	pd_data->domains = devm_kzalloc(&pdev->dev,
 			sizeof(*pd_data->domains) * NUM_DOMAINS, GFP_KERNEL);
 	if (!pd_data->domains)
 		return -ENOMEM;

 	clk[MT8173_CLK_MM] = devm_clk_get(&pdev->dev, "mm");
 	if (IS_ERR(clk[MT8173_CLK_MM]))
 		return PTR_ERR(clk[MT8173_CLK_MM]);

 	clk[MT8173_CLK_MFG] = devm_clk_get(&pdev->dev, "mfg");
 	if (IS_ERR(clk[MT8173_CLK_MFG]))
 		return PTR_ERR(clk[MT8173_CLK_MFG]);

 	clk[MT8173_CLK_VENC] = devm_clk_get(&pdev->dev, "venc");
 	if (IS_ERR(clk[MT8173_CLK_VENC]))
 		return PTR_ERR(clk[MT8173_CLK_VENC]);

 	clk[MT8173_CLK_VENC_LT] = devm_clk_get(&pdev->dev, "venc_lt");
 	if (IS_ERR(clk[MT8173_CLK_VENC_LT]))
 		return PTR_ERR(clk[MT8173_CLK_VENC_LT]);

 	scp->infracfg = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 			"infracfg");
 	if (IS_ERR(scp->infracfg)) {
 		dev_err(&pdev->dev, "Cannot find infracfg controller: %ld\n",
 				PTR_ERR(scp->infracfg));
 		return PTR_ERR(scp->infracfg);
 	}

 	for (i = 0; i < NUM_DOMAINS; i++) {
 		struct scp_domain *scpd = &scp->domains[i];
 		const struct scp_domain_data *data = &scp_domain_data[i];

 		scpd->supply = devm_regulator_get_optional(&pdev->dev, data->name);
 		if (IS_ERR(scpd->supply)) {
 			if (PTR_ERR(scpd->supply) == -ENODEV)
 				scpd->supply = NULL;
 			else
 				return PTR_ERR(scpd->supply);
 		}
 	}

 	pd_data->num_domains = NUM_DOMAINS;

 	for (i = 0; i < NUM_DOMAINS; i++) {
 		struct scp_domain *scpd = &scp->domains[i];
 		struct generic_pm_domain *genpd = &scpd->genpd;
 		const struct scp_domain_data *data = &scp_domain_data[i];

 		pd_data->domains[i] = genpd;
 		scpd->scp = scp;

 		scpd->data = data;
 		for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++)
 			scpd->clk[j] = clk[data->clk_id[j]];

 		genpd->name = data->name;
 		genpd->power_off = scpsys_power_off;
 		genpd->power_on = scpsys_power_on;
 		genpd->dev_ops.active_wakeup = scpsys_active_wakeup;

 		/*
 		 * With CONFIG_PM disabled turn on all domains to make the
 		 * hardware usable.
 		 */
 		if (!IS_ENABLED(CONFIG_PM))
 			genpd->power_on(genpd);

 		pm_genpd_init(genpd, NULL, true);
 	}

 	/*
 	 * We are not allowed to fail here since there is no way to unregister
 	 * a power domain. Once registered above we have to keep the domains
 	 * valid.
 	 */

 	ret = pm_genpd_add_subdomain(pd_data->domains[MT8173_POWER_DOMAIN_MFG_ASYNC],
 		pd_data->domains[MT8173_POWER_DOMAIN_MFG_2D]);
 	if (ret && IS_ENABLED(CONFIG_PM))
 		dev_err(&pdev->dev, "Failed to add subdomain: %d\n", ret);

 	ret = pm_genpd_add_subdomain(pd_data->domains[MT8173_POWER_DOMAIN_MFG_2D],
 		pd_data->domains[MT8173_POWER_DOMAIN_MFG]);
 	if (ret && IS_ENABLED(CONFIG_PM))
 		dev_err(&pdev->dev, "Failed to add subdomain: %d\n", ret);

 	ret = of_genpd_add_provider_onecell(pdev->dev.of_node, pd_data);
 	if (ret)
 		dev_err(&pdev->dev, "Failed to add OF provider: %d\n", ret);

 	return 0;
 }

 static const struct of_device_id of_scpsys_match_tbl[] = {
 	{
 		.compatible = "mediatek,mt8173-scpsys",
 	}, {
 		/* sentinel */
 	}
 };

 static struct platform_driver scpsys_drv = {
 	.probe = scpsys_probe,
 	.driver = {
 		.name = "mtk-scpsys",
 		.suppress_bind_attrs = true,
 		.owner = THIS_MODULE,
 		.of_match_table = of_match_ptr(of_scpsys_match_tbl),
 	},
 };
 builtin_platform_driver(scpsys_drv);
	/*
	* Copyright (c) 2015 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/
	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/mfd/syscon.h>
	#include <linux/init.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/pm_domain.h>
	#include <linux/regmap.h>
	#include <linux/soc/mediatek/infracfg.h>
	#include <linux/regulator/consumer.h>
	#include <dt-bindings/power/mt8173-power.h>

	#define SPM_VDE_PWR_CON 0x0210
	#define SPM_MFG_PWR_CON 0x0214
	#define SPM_VEN_PWR_CON 0x0230
	#define SPM_ISP_PWR_CON 0x0238
	#define SPM_DIS_PWR_CON 0x023c
	#define SPM_VEN2_PWR_CON 0x0298
	#define SPM_AUDIO_PWR_CON 0x029c
	#define SPM_MFG_2D_PWR_CON 0x02c0
	#define SPM_MFG_ASYNC_PWR_CON 0x02c4
	#define SPM_USB_PWR_CON 0x02cc
	#define SPM_PWR_STATUS 0x060c
	#define SPM_PWR_STATUS_2ND 0x0610

	#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_DISP BIT(3)
	#define PWR_STATUS_MFG BIT(4)
	#define PWR_STATUS_ISP BIT(5)
	#define PWR_STATUS_VDEC BIT(7)
	#define PWR_STATUS_VENC_LT BIT(20)
	#define PWR_STATUS_VENC BIT(21)
	#define PWR_STATUS_MFG_2D BIT(22)
	#define PWR_STATUS_MFG_ASYNC BIT(23)
	#define PWR_STATUS_AUDIO BIT(24)
	#define PWR_STATUS_USB BIT(25)

	enum clk_id {
	MT8173_CLK_NONE,
	MT8173_CLK_MM,
	MT8173_CLK_MFG,
	MT8173_CLK_VENC,
	MT8173_CLK_VENC_LT,
	MT8173_CLK_MAX,
	};

	#define MAX_CLKS 2

	struct scp_domain_data {
	const char *name;
	u32 sta_mask;
	int ctl_offs;
	u32 sram_pdn_bits;
	u32 sram_pdn_ack_bits;
	u32 bus_prot_mask;
	enum clk_id clk_id[MAX_CLKS];
	bool active_wakeup;
	};

	static const struct scp_domain_data scp_domain_data[] = {
	[MT8173_POWER_DOMAIN_VDEC] = {
	.name = "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),
	.clk_id = {MT8173_CLK_MM},
	},
	[MT8173_POWER_DOMAIN_VENC] = {
	.name = "venc",
	.sta_mask = PWR_STATUS_VENC,
	.ctl_offs = SPM_VEN_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(15, 12),
	.clk_id = {MT8173_CLK_MM, MT8173_CLK_VENC},
	},
	[MT8173_POWER_DOMAIN_ISP] = {
	.name = "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),
	.clk_id = {MT8173_CLK_MM},
	},
	[MT8173_POWER_DOMAIN_MM] = {
	.name = "mm",
	.sta_mask = PWR_STATUS_DISP,
	.ctl_offs = SPM_DIS_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(12, 12),
	.clk_id = {MT8173_CLK_MM},
	.bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MM_M0 \|
	MT8173_TOP_AXI_PROT_EN_MM_M1,
	},
	[MT8173_POWER_DOMAIN_VENC_LT] = {
	.name = "venc_lt",
	.sta_mask = PWR_STATUS_VENC_LT,
	.ctl_offs = SPM_VEN2_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(15, 12),
	.clk_id = {MT8173_CLK_MM, MT8173_CLK_VENC_LT},
	},
	[MT8173_POWER_DOMAIN_AUDIO] = {
	.name = "audio",
	.sta_mask = PWR_STATUS_AUDIO,
	.ctl_offs = SPM_AUDIO_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(15, 12),
	.clk_id = {MT8173_CLK_NONE},
	},
	[MT8173_POWER_DOMAIN_USB] = {
	.name = "usb",
	.sta_mask = PWR_STATUS_USB,
	.ctl_offs = SPM_USB_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(15, 12),
	.clk_id = {MT8173_CLK_NONE},
	.active_wakeup = true,
	},
	[MT8173_POWER_DOMAIN_MFG_ASYNC] = {
	.name = "mfg_async",
	.sta_mask = PWR_STATUS_MFG_ASYNC,
	.ctl_offs = SPM_MFG_ASYNC_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = 0,
	.clk_id = {MT8173_CLK_MFG},
	},
	[MT8173_POWER_DOMAIN_MFG_2D] = {
	.name = "mfg_2d",
	.sta_mask = PWR_STATUS_MFG_2D,
	.ctl_offs = SPM_MFG_2D_PWR_CON,
	.sram_pdn_bits = GENMASK(11, 8),
	.sram_pdn_ack_bits = GENMASK(13, 12),
	.clk_id = {MT8173_CLK_NONE},
	},
	[MT8173_POWER_DOMAIN_MFG] = {
	.name = "mfg",
	.sta_mask = PWR_STATUS_MFG,
	.ctl_offs = SPM_MFG_PWR_CON,
	.sram_pdn_bits = GENMASK(13, 8),
	.sram_pdn_ack_bits = GENMASK(21, 16),
	.clk_id = {MT8173_CLK_NONE},
	.bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MFG_S \|
	MT8173_TOP_AXI_PROT_EN_MFG_M0 \|
	MT8173_TOP_AXI_PROT_EN_MFG_M1 \|
	MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT,
	},
	};

	#define NUM_DOMAINS ARRAY_SIZE(scp_domain_data)

	struct scp;

	struct scp_domain {
	struct generic_pm_domain genpd;
	struct scp *scp;
	struct clk *clk[MAX_CLKS];
	const struct scp_domain_data *data;
	struct regulator *supply;
	};

	struct scp {
	struct scp_domain domains[NUM_DOMAINS];
	struct genpd_onecell_data pd_data;
	struct device *dev;
	void __iomem *base;
	struct regmap *infracfg;
	};

	static int scpsys_domain_is_on(struct scp_domain *scpd)
	{
	struct scp *scp = scpd->scp;

	u32 status = readl(scp->base + SPM_PWR_STATUS) & scpd->data->sta_mask;
	u32 status2 = readl(scp->base + SPM_PWR_STATUS_2ND) &
	scpd->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 (status && status2)
	return true;
	if (!status && !status2)
	return false;

	return -EINVAL;
	}

	static int scpsys_power_on(struct generic_pm_domain *genpd)
	{
	struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
	struct scp *scp = scpd->scp;
	unsigned long timeout;
	bool expired;
	void __iomem *ctl_addr = scp->base + scpd->data->ctl_offs;
	u32 sram_pdn_ack = scpd->data->sram_pdn_ack_bits;
	u32 val;
	int ret;
	int i;

	if (scpd->supply) {
	ret = regulator_enable(scpd->supply);
	if (ret)
	return ret;
	}

	for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++) {
	ret = clk_prepare_enable(scpd->clk[i]);
	if (ret) {
	for (--i; i >= 0; i--)
	clk_disable_unprepare(scpd->clk[i]);

	goto err_clk;
	}
	}

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

	/* wait until PWR_ACK = 1 */
	timeout = jiffies + HZ;
	expired = false;
	while (1) {
	ret = scpsys_domain_is_on(scpd);
	if (ret > 0)
	break;

	if (expired) {
	ret = -ETIMEDOUT;
	goto err_pwr_ack;
	}

	cpu_relax();

	if (time_after(jiffies, timeout))
	expired = true;
	}

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

	/* wait until SRAM_PDN_ACK all 0 */
	timeout = jiffies + HZ;
	expired = false;
	while (sram_pdn_ack && (readl(ctl_addr) & sram_pdn_ack)) {

	if (expired) {
	ret = -ETIMEDOUT;
	goto err_pwr_ack;
	}

	cpu_relax();

	if (time_after(jiffies, timeout))
	expired = true;
	}

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

	return 0;

	err_pwr_ack:
	for (i = MAX_CLKS - 1; i >= 0; i--) {
	if (scpd->clk[i])
	clk_disable_unprepare(scpd->clk[i]);
	}
	err_clk:
	if (scpd->supply)
	regulator_disable(scpd->supply);

	dev_err(scp->dev, "Failed to power on domain %s\n", genpd->name);

	return ret;
	}

	static int scpsys_power_off(struct generic_pm_domain *genpd)
	{
	struct scp_domain *scpd = container_of(genpd, struct scp_domain, genpd);
	struct scp *scp = scpd->scp;
	unsigned long timeout;
	bool expired;
	void __iomem *ctl_addr = scp->base + scpd->data->ctl_offs;
	u32 pdn_ack = scpd->data->sram_pdn_ack_bits;
	u32 val;
	int ret;
	int i;

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

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

	/* wait until SRAM_PDN_ACK all 1 */
	timeout = jiffies + HZ;
	expired = false;
	while (pdn_ack && (readl(ctl_addr) & pdn_ack) != pdn_ack) {
	if (expired) {
	ret = -ETIMEDOUT;
	goto out;
	}

	cpu_relax();

	if (time_after(jiffies, timeout))
	expired = true;
	}

	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);

	/* wait until PWR_ACK = 0 */
	timeout = jiffies + HZ;
	expired = false;
	while (1) {
	ret = scpsys_domain_is_on(scpd);
	if (ret == 0)
	break;

	if (expired) {
	ret = -ETIMEDOUT;
	goto out;
	}

	cpu_relax();

	if (time_after(jiffies, timeout))
	expired = true;
	}

	for (i = 0; i < MAX_CLKS && scpd->clk[i]; i++)
	clk_disable_unprepare(scpd->clk[i]);

	if (scpd->supply)
	regulator_disable(scpd->supply);

	return 0;

	out:
	dev_err(scp->dev, "Failed to power off domain %s\n", genpd->name);

	return ret;
	}

	static bool scpsys_active_wakeup(struct device *dev)
	{
	struct generic_pm_domain *genpd;
	struct scp_domain *scpd;

	genpd = pd_to_genpd(dev->pm_domain);
	scpd = container_of(genpd, struct scp_domain, genpd);

	return scpd->data->active_wakeup;
	}

	static int scpsys_probe(struct platform_device *pdev)
	{
	struct genpd_onecell_data *pd_data;
	struct resource *res;
	int i, j, ret;
	struct scp *scp;
	struct clk *clk[MT8173_CLK_MAX];

	scp = devm_kzalloc(&pdev->dev, sizeof(*scp), GFP_KERNEL);
	if (!scp)
	return -ENOMEM;

	scp->dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	scp->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(scp->base))
	return PTR_ERR(scp->base);

	pd_data = &scp->pd_data;

	pd_data->domains = devm_kzalloc(&pdev->dev,
	sizeof(pd_data->domains) NUM_DOMAINS, GFP_KERNEL);
	if (!pd_data->domains)
	return -ENOMEM;

	clk[MT8173_CLK_MM] = devm_clk_get(&pdev->dev, "mm");
	if (IS_ERR(clk[MT8173_CLK_MM]))
	return PTR_ERR(clk[MT8173_CLK_MM]);

	clk[MT8173_CLK_MFG] = devm_clk_get(&pdev->dev, "mfg");
	if (IS_ERR(clk[MT8173_CLK_MFG]))
	return PTR_ERR(clk[MT8173_CLK_MFG]);

	clk[MT8173_CLK_VENC] = devm_clk_get(&pdev->dev, "venc");
	if (IS_ERR(clk[MT8173_CLK_VENC]))
	return PTR_ERR(clk[MT8173_CLK_VENC]);

	clk[MT8173_CLK_VENC_LT] = devm_clk_get(&pdev->dev, "venc_lt");
	if (IS_ERR(clk[MT8173_CLK_VENC_LT]))
	return PTR_ERR(clk[MT8173_CLK_VENC_LT]);

	scp->infracfg = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
	"infracfg");
	if (IS_ERR(scp->infracfg)) {
	dev_err(&pdev->dev, "Cannot find infracfg controller: %ld\n",
	PTR_ERR(scp->infracfg));
	return PTR_ERR(scp->infracfg);
	}

	for (i = 0; i < NUM_DOMAINS; i++) {
	struct scp_domain *scpd = &scp->domains[i];
	const struct scp_domain_data *data = &scp_domain_data[i];

	scpd->supply = devm_regulator_get_optional(&pdev->dev, data->name);
	if (IS_ERR(scpd->supply)) {
	if (PTR_ERR(scpd->supply) == -ENODEV)
	scpd->supply = NULL;
	else
	return PTR_ERR(scpd->supply);
	}
	}

	pd_data->num_domains = NUM_DOMAINS;

	for (i = 0; i < NUM_DOMAINS; i++) {
	struct scp_domain *scpd = &scp->domains[i];
	struct generic_pm_domain *genpd = &scpd->genpd;
	const struct scp_domain_data *data = &scp_domain_data[i];

	pd_data->domains[i] = genpd;
	scpd->scp = scp;

	scpd->data = data;
	for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++)
	scpd->clk[j] = clk[data->clk_id[j]];

	genpd->name = data->name;
	genpd->power_off = scpsys_power_off;
	genpd->power_on = scpsys_power_on;
	genpd->dev_ops.active_wakeup = scpsys_active_wakeup;

	/*
	* With CONFIG_PM disabled turn on all domains to make the
	* hardware usable.
	*/
	if (!IS_ENABLED(CONFIG_PM))
	genpd->power_on(genpd);

	pm_genpd_init(genpd, NULL, true);
	}

	/*
	* We are not allowed to fail here since there is no way to unregister
	* a power domain. Once registered above we have to keep the domains
	* valid.
	*/

	ret = pm_genpd_add_subdomain(pd_data->domains[MT8173_POWER_DOMAIN_MFG_ASYNC],
	pd_data->domains[MT8173_POWER_DOMAIN_MFG_2D]);
	if (ret && IS_ENABLED(CONFIG_PM))
	dev_err(&pdev->dev, "Failed to add subdomain: %d\n", ret);

	ret = pm_genpd_add_subdomain(pd_data->domains[MT8173_POWER_DOMAIN_MFG_2D],
	pd_data->domains[MT8173_POWER_DOMAIN_MFG]);
	if (ret && IS_ENABLED(CONFIG_PM))
	dev_err(&pdev->dev, "Failed to add subdomain: %d\n", ret);

	ret = of_genpd_add_provider_onecell(pdev->dev.of_node, pd_data);
	if (ret)
	dev_err(&pdev->dev, "Failed to add OF provider: %d\n", ret);

	return 0;
	}

	static const struct of_device_id of_scpsys_match_tbl[] = {
	{
	.compatible = "mediatek,mt8173-scpsys",
	}, {
	/* sentinel */
	}
	};

	static struct platform_driver scpsys_drv = {
	.probe = scpsys_probe,
	.driver = {
	.name = "mtk-scpsys",
	.suppress_bind_attrs = true,
	.owner = THIS_MODULE,
	.of_match_table = of_match_ptr(of_scpsys_match_tbl),
	},
	};
	builtin_platform_driver(scpsys_drv);