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From:   Sylwester Nawrocki <s.nawrocki@samsung.com>
To:     krzk@kernel.org
Cc:     robh+dt@kernel.org, vireshk@kernel.org, devicetree@vger.kernel.org,
        kgene@kernel.org, pankaj.dubey@samsung.com,
        linux-samsung-soc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, b.zolnierkie@samsung.com,
        m.szyprowski@samsung.com,
        Sylwester Nawrocki <s.nawrocki@samsung.com>
Subject: [PATCH v2 3/9] soc: samsung: Add Exynos Adaptive Supply Voltage
 driver
Date:   Thu, 18 Jul 2019 16:30:38 +0200
Message-Id: <20190718143044.25066-4-s.nawrocki@samsung.com>
In-Reply-To: <20190718143044.25066-1-s.nawrocki@samsung.com>
Content-Type: text/plain; charset="utf-8"
CMS-TYPE: 201P
References: <20190718143044.25066-1-s.nawrocki@samsung.com>
        <CGME20190718143130eucas1p26f2058f47eb2f4020e1ddbf1619d1ac8@eucas1p2.samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The Adaptive Supply Voltage (ASV) driver adjusts CPU cluster operating
points depending on exact revision of an SoC retrieved from the CHIPID
block or the OTP memory.  This allows for some power saving as for some
CPU clock frequencies we can lower CPU cluster supply voltage comparing
to safe values common to the all chip revisions.

This patch adds support for Exynos5422/5800 SoC, it is partially based
on code from https://github.com/hardkernel/linux repository,
branch odroidxu4-4.14.y, files: arch/arm/mach-exynos/exynos5422-asv.[ch].

Tested on Odroid XU3, XU4, XU3 Lite.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
Changes since v1 (RFC):
 - removed code for parsing the ASV OPP tables from DT, the ASV OPP tables
   moved to the driver;
 - converted to use the regmap API;
 - converted to normal platform driver.
---
 drivers/soc/samsung/Kconfig          |  11 +
 drivers/soc/samsung/Makefile         |   3 +
 drivers/soc/samsung/exynos-asv.c     | 185 ++++++++++
 drivers/soc/samsung/exynos-asv.h     |  82 +++++
 drivers/soc/samsung/exynos5422-asv.c | 499 +++++++++++++++++++++++++++
 drivers/soc/samsung/exynos5422-asv.h |  25 ++
 6 files changed, 805 insertions(+)
 create mode 100644 drivers/soc/samsung/exynos-asv.c
 create mode 100644 drivers/soc/samsung/exynos-asv.h
 create mode 100644 drivers/soc/samsung/exynos5422-asv.c
 create mode 100644 drivers/soc/samsung/exynos5422-asv.h

diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig
index 2905f5262197..539cd95dd176 100644
--- a/drivers/soc/samsung/Kconfig
+++ b/drivers/soc/samsung/Kconfig
@@ -7,6 +7,17 @@ menuconfig SOC_SAMSUNG
 
 if SOC_SAMSUNG
 
+config EXYNOS_ASV
+	bool "Exynos Adaptive Supply Voltage support" if COMPILE_TEST
+	depends on ARCH_EXYNOS || COMPILE_TEST
+	depends on EXYNOS_CHIPID
+	select EXYNOS_ASV_ARM if ARM && ARCH_EXYNOS
+
+# There is no need to enable these drivers for ARMv8
+config EXYNOS_ASV_ARM
+	bool "Exynos ASV ARMv7-specific driver extensions" if COMPILE_TEST
+	depends on EXYNOS_ASV
+
 config EXYNOS_CHIPID
 	bool "Exynos Chipid controller driver" if COMPILE_TEST
 	depends on ARCH_EXYNOS || COMPILE_TEST
diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile
index 3b6a8797416c..edd1d6ea064d 100644
--- a/drivers/soc/samsung/Makefile
+++ b/drivers/soc/samsung/Makefile
@@ -1,5 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0
 
+obj-$(CONFIG_EXYNOS_ASV)	+= exynos-asv.o
+obj-$(CONFIG_EXYNOS_ASV_ARM)	+= exynos5422-asv.o
+
 obj-$(CONFIG_EXYNOS_CHIPID)	+= exynos-chipid.o
 obj-$(CONFIG_EXYNOS_PMU)	+= exynos-pmu.o
 
diff --git a/drivers/soc/samsung/exynos-asv.c b/drivers/soc/samsung/exynos-asv.c
new file mode 100644
index 000000000000..b1a7e0ba8870
--- /dev/null
+++ b/drivers/soc/samsung/exynos-asv.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd.
+ *	      http://www.samsung.com/
+ * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
+ *
+ * Samsung Exynos SoC Adaptive Supply Voltage support
+ */
+
+#include <linux/cpu.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/soc/samsung/exynos-chipid.h>
+
+#include "exynos-asv.h"
+#include "exynos5422-asv.h"
+
+#define MHZ 1000000U
+
+static int exynos_asv_update_cpu_opps(struct exynos_asv *asv,
+				      struct device *cpu)
+{
+	struct exynos_asv_subsys *subsys = NULL;
+	struct dev_pm_opp *opp;
+	unsigned int opp_freq;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(asv->subsys); i++) {
+		if (of_device_is_compatible(cpu->of_node,
+					    asv->subsys[i].cpu_dt_compat)) {
+			subsys = &asv->subsys[i];
+			break;
+		}
+	}
+	if (!subsys)
+		return -EINVAL;
+
+	for (i = 0; i < subsys->table.num_rows; i++) {
+		unsigned int new_voltage;
+		unsigned int voltage;
+		int timeout = 1000;
+		int err;
+
+		opp_freq = exynos_asv_opp_get_frequency(subsys, i);
+
+		opp = dev_pm_opp_find_freq_exact(cpu, opp_freq * MHZ, true);
+		if (IS_ERR(opp)) {
+			dev_info(asv->dev, "cpu%d opp%d, freq: %u missing\n",
+				 cpu->id, i, opp_freq);
+
+			continue;
+		}
+
+		voltage = dev_pm_opp_get_voltage(opp);
+		new_voltage = asv->opp_get_voltage(subsys, i, voltage);
+		dev_pm_opp_put(opp);
+
+		opp_freq *= MHZ;
+		dev_pm_opp_remove(cpu, opp_freq);
+
+		while (--timeout) {
+			opp = dev_pm_opp_find_freq_exact(cpu, opp_freq, true);
+			if (IS_ERR(opp))
+				break;
+			dev_pm_opp_put(opp);
+			msleep(1);
+		}
+
+		err = dev_pm_opp_add(cpu, opp_freq, new_voltage);
+		if (err < 0)
+			dev_err(asv->dev,
+				"Failed to add OPP %u Hz/%u uV for cpu%d\n",
+				opp_freq, new_voltage, cpu->id);
+	}
+
+	return 0;
+}
+
+static int exynos_asv_update_opps(struct exynos_asv *asv)
+{
+	struct opp_table *last_opp_table = NULL;
+	struct device *cpu;
+	int ret, cpuid;
+
+	for_each_possible_cpu(cpuid) {
+		struct opp_table *opp_table;
+
+		cpu = get_cpu_device(cpuid);
+		if (!cpu)
+			continue;
+
+		opp_table = dev_pm_opp_get_opp_table(cpu);
+		if (IS_ERR(opp_table))
+			continue;
+
+		if (!last_opp_table || opp_table != last_opp_table) {
+			last_opp_table = opp_table;
+
+			ret = exynos_asv_update_cpu_opps(asv, cpu);
+			if (ret < 0)
+				dev_err(asv->dev, "Couldn't udate OPPs for cpu%d\n",
+					cpuid);
+		}
+
+		dev_pm_opp_put_opp_table(opp_table);
+	}
+
+	return	0;
+}
+
+static int exynos_asv_probe(struct platform_device *pdev)
+{
+	int (*probe_func)(struct exynos_asv *asv);
+	struct exynos_asv *asv;
+	struct device *cpu_dev;
+	u32 product_id = 0;
+	int ret, i;
+
+	cpu_dev = get_cpu_device(0);
+	ret = dev_pm_opp_get_opp_count(cpu_dev);
+	if (ret < 0)
+		return -EPROBE_DEFER;
+
+	asv = kcalloc(1, sizeof(*asv), GFP_KERNEL);
+	if (!asv)
+		return -ENOMEM;
+
+	asv->chipid_regmap = syscon_node_to_regmap(pdev->dev.of_node);
+	if (IS_ERR(asv->chipid_regmap)) {
+		dev_err(&pdev->dev, "Could not find syscon regmap\n");
+		return PTR_ERR(asv->chipid_regmap);
+	}
+
+	regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PRO_ID, &product_id);
+
+	switch (product_id & EXYNOS_MASK) {
+	case 0xE5422000:
+		probe_func = exynos5422_asv_init;
+		break;
+	default:
+		dev_err(&pdev->dev, "Unsupported product ID: %#x", product_id);
+		return -ENODEV;
+	}
+
+	ret = of_property_read_u32(pdev->dev.of_node, "samsung,asv-bin",
+				   &asv->of_bin);
+	if (ret < 0)
+		asv->of_bin = -EINVAL;
+
+	asv->dev = &pdev->dev;
+	dev_set_drvdata(&pdev->dev, asv);
+
+	for (i = 0; i < ARRAY_SIZE(asv->subsys); i++)
+		asv->subsys[i].asv = asv;
+
+	ret = probe_func(asv);
+	if (ret < 0)
+		return ret;
+
+	return exynos_asv_update_opps(asv);
+}
+
+static const struct of_device_id exynos_asv_of_device_ids[] = {
+	{ .compatible = "samsung,exynos4210-chipid" },
+	{}
+};
+
+static struct platform_driver exynos_asv_driver = {
+	.driver = {
+		.name = "exynos-asv",
+		.of_match_table = exynos_asv_of_device_ids,
+	},
+	.probe	= exynos_asv_probe,
+};
+module_platform_driver(exynos_asv_driver);
diff --git a/drivers/soc/samsung/exynos-asv.h b/drivers/soc/samsung/exynos-asv.h
new file mode 100644
index 000000000000..d0a5d603093d
--- /dev/null
+++ b/drivers/soc/samsung/exynos-asv.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd.
+ *	      http://www.samsung.com/
+ * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
+ *
+ * Samsung Exynos SoC Adaptive Supply Voltage support
+ */
+#ifndef _EXYNOS_ASV_H
+#define _EXYNOS_ASV_H
+
+enum {
+	EXYNOS_ASV_SUBSYS_ID_ARM,
+	EXYNOS_ASV_SUBSYS_ID_EGL = EXYNOS_ASV_SUBSYS_ID_ARM,
+	EXYNOS_ASV_SUBSYS_ID_KFC,
+	EXYNOS_ASV_SUBSYS_ID_INT,
+	EXYNOS_ASV_SUBSYS_ID_MIF,
+	EXYNOS_ASV_SUBSYS_ID_G3D,
+	EXYNOS_ASV_SUBSYS_ID_CAM,
+	EXYNOS_ASV_SUBSYS_ID_MAX
+};
+
+struct regmap;
+
+/* HPM, IDS values to select target group */
+struct asv_limit_entry {
+	unsigned int hpm;
+	unsigned int ids;
+};
+
+struct exynos_asv_table {
+	unsigned int num_rows;
+	unsigned int num_cols;
+	u32 *buf;
+};
+
+struct exynos_asv_subsys {
+	struct exynos_asv *asv;
+	char *cpu_dt_compat;
+	int id;
+	struct exynos_asv_table table;
+
+	unsigned int base_volt;
+	unsigned int offset_volt_h;
+	unsigned int offset_volt_l;
+};
+
+struct exynos_asv {
+	struct device *dev;
+	struct regmap *chipid_regmap;
+	struct exynos_asv_subsys subsys[2];
+
+	int (*opp_get_voltage)(struct exynos_asv_subsys *subs, int level,
+			       unsigned int voltage);
+	unsigned int group;
+	unsigned int table;
+
+	/* True if SG fields from PKG_ID register should be used */
+	bool use_sg;
+	/* ASV bin read from DT */
+	int of_bin;
+};
+
+static inline u32 __asv_get_table_entry(struct exynos_asv_table *table,
+					unsigned int row, unsigned int col)
+{
+	return table->buf[row * (table->num_cols) + col];
+}
+
+static inline u32 exynos_asv_opp_get_voltage(struct exynos_asv_subsys *subsys,
+					unsigned int level, unsigned int group)
+{
+	return __asv_get_table_entry(&subsys->table, level, group + 1);
+}
+
+static inline u32 exynos_asv_opp_get_frequency(struct exynos_asv_subsys *subsys,
+					unsigned int level)
+{
+	return __asv_get_table_entry(&subsys->table, level, 0);
+}
+
+#endif /* _EXYNOS_ASV_H */
diff --git a/drivers/soc/samsung/exynos5422-asv.c b/drivers/soc/samsung/exynos5422-asv.c
new file mode 100644
index 000000000000..5fd673a6a733
--- /dev/null
+++ b/drivers/soc/samsung/exynos5422-asv.c
@@ -0,0 +1,499 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd.
+ *	      http://www.samsung.com/
+ *
+ * Samsung Exynos 5422 SoC Adaptive Supply Voltage support
+ */
+
+#include <linux/bitrev.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/soc/samsung/exynos-chipid.h>
+#include <linux/slab.h>
+
+#include "exynos-asv.h"
+
+#define ASV_GROUPS_NUM		14
+#define ASV_ARM_DVFS_NUM	20
+#define ASV_ARM_BIN2_DVFS_NUM	17
+#define ASV_KFC_DVFS_NUM	14
+#define ASV_KFC_BIN2_DVFS_NUM	12
+
+static const u32 asv_arm_table[][ASV_ARM_DVFS_NUM][ASV_GROUPS_NUM + 1] = {
+{
+	/* ARM 0, 1 */
+	{ 2100,    1362500, 1362500, 1350000, 1337500, 1325000, 1312500, 1300000,
+	  1275000, 1262500, 1250000, 1237500, 1225000, 1212500, 1200000 },
+	{ 2000,    1312500, 1312500, 1300000, 1287500, 1275000, 1262500, 1250000,
+	  1237500, 1225000, 1237500, 1225000, 1212500, 1200000, 1187500 },
+	{ 1900,    1250000, 1237500, 1225000, 1212500, 1200000, 1187500, 1175000,
+	  1162500, 1150000, 1162500, 1150000, 1137500, 1125000, 1112500 },
+	{ 1800,    1200000, 1187500, 1175000, 1162500, 1150000, 1137500, 1125000,
+	  1112500, 1100000, 1112500, 1100000, 1087500, 1075000, 1062500 },
+	{ 1700,    1162500, 1150000, 1137500, 1125000, 1112500, 1100000, 1087500,
+	  1075000, 1062500, 1075000, 1062500, 1050000, 1037500, 1025000 },
+	{ 1600,    1125000, 1112500, 1100000, 1087500, 1075000, 1062500, 1050000,
+	  1037500, 1025000, 1037500, 1025000, 1012500, 1000000, 987500 },
+	{ 1500,    1087500, 1075000, 1062500, 1050000, 1037500, 1025000, 1012500,
+	  1000000, 987500,  1000000, 987500,  975000,  962500,  950000 },
+	{ 1400,    1062500, 1050000, 1037500, 1025000, 1012500, 1000000, 987500,
+	  975000,  962500,  975000,  962500,  950000,  937500,  925000 },
+	{ 1300,    1050000, 1037500, 1025000, 1012500, 1000000, 987500,  975000,
+	  962500,  950000,  962500,  950000,  937500,  925000,  912500 },
+	{ 1200,    1025000, 1012500, 1000000, 987500,  975000,  962500,  950000,
+	  937500,  925000,  937500,  925000,  912500,  900000,  900000 },
+	{ 1100,    1000000, 987500,  975000,  962500,  950000,  937500,  925000,
+	  912500,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 1000,    975000,  962500,  950000,  937500,  925000,  912500,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 900,     950000,  937500,  925000,  912500,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 800,     925000,  912500,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 700,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 600,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 500,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 400,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 300,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 200,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+}, {
+	/* ARM 2 */
+	{ 2100,    1362500, 1362500, 1350000, 1337500, 1325000, 1312500, 1300000,
+	  1275000, 1262500, 1250000, 1237500, 1225000, 1212500, 1200000 },
+	{ 2000,    1312500, 1312500, 1312500, 1300000, 1275000, 1262500, 1250000,
+	  1237500, 1225000, 1237500, 1225000, 1212500, 1200000, 1187500 },
+	{ 1900,    1262500, 1250000, 1250000, 1237500, 1212500, 1200000, 1187500,
+	  1175000, 1162500, 1175000, 1162500, 1150000, 1137500, 1125000 },
+	{ 1800,    1212500, 1200000, 1187500, 1175000, 1162500, 1150000, 1137500,
+	  1125000, 1112500, 1125000, 1112500, 1100000, 1087500, 1075000 },
+	{ 1700,    1175000, 1162500, 1150000, 1137500, 1125000, 1112500, 1100000,
+	  1087500, 1075000, 1087500, 1075000, 1062500, 1050000, 1037500 },
+	{ 1600,    1137500, 1125000, 1112500, 1100000, 1087500, 1075000, 1062500,
+	  1050000, 1037500, 1050000, 1037500, 1025000, 1012500, 1000000 },
+	{ 1500,    1100000, 1087500, 1075000, 1062500, 1050000, 1037500, 1025000,
+	  1012500, 1000000, 1012500, 1000000, 987500,  975000,  962500 },
+	{ 1400,    1075000, 1062500, 1050000, 1037500, 1025000, 1012500, 1000000,
+	  987500,  975000,  987500,  975000,  962500,  950000,  937500 },
+	{ 1300,    1050000, 1037500, 1025000, 1012500, 1000000, 987500,  975000,
+	  962500,  950000,  962500,  950000,  937500,  925000,  912500 },
+	{ 1200,    1025000, 1012500, 1000000, 987500,  975000,  962500,  950000,
+	  937500,  925000,  937500,  925000,  912500,  900000,  900000 },
+	{ 1100,    1000000, 987500,  975000,  962500,  950000,  937500,  925000,
+	  912500,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 1000,    975000,  962500,  950000,  937500,  925000,  912500,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 900,     950000,  937500,  925000,  912500,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 800,     925000,  912500,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 700,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 600,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 500,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 400,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 300,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 200,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+}, {
+	/* ARM 3 */
+	{ 2100,    1362500, 1362500, 1350000, 1337500, 1325000, 1312500, 1300000,
+	  1275000, 1262500, 1250000, 1237500, 1225000, 1212500, 1200000 },
+	{ 2000,    1312500, 1312500, 1300000, 1287500, 1275000, 1262500, 1250000,
+	  1237500, 1225000, 1237500, 1225000, 1212500, 1200000, 1187500 },
+	{ 1900,    1262500, 1250000, 1237500, 1225000, 1212500, 1200000, 1187500,
+	  1175000, 1162500, 1175000, 1162500, 1150000, 1137500, 1125000 },
+	{ 1800,    1212500, 1200000, 1187500, 1175000, 1162500, 1150000, 1137500,
+	  1125000, 1112500, 1125000, 1112500, 1100000, 1087500, 1075000 },
+	{ 1700,    1175000, 1162500, 1150000, 1137500, 1125000, 1112500, 1100000,
+	  1087500, 1075000, 1087500, 1075000, 1062500, 1050000, 1037500 },
+	{ 1600,    1137500, 1125000, 1112500, 1100000, 1087500, 1075000, 1062500,
+	  1050000, 1037500, 1050000, 1037500, 1025000, 1012500, 1000000 },
+	{ 1500,    1100000, 1087500, 1075000, 1062500, 1050000, 1037500, 1025000,
+	  1012500, 1000000, 1012500, 1000000, 987500,  975000,  962500 },
+	{ 1400,    1075000, 1062500, 1050000, 1037500, 1025000, 1012500, 1000000,
+	  987500,  975000,  987500,  975000,  962500,  950000,  937500 },
+	{ 1300,    1050000, 1037500, 1025000, 1012500, 1000000, 987500,  975000,
+	  962500,  950000,  962500,  950000,  937500,  925000,  912500 },
+	{ 1200,    1025000, 1012500, 1000000, 987500,  975000,  962500,  950000,
+	  937500,  925000,  937500,  925000,  912500,  900000,  900000 },
+	{ 1100,    1000000, 987500,  975000,  962500,  950000,  937500,  925000,
+	  912500,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 1000,    975000,  962500,  950000,  937500,  925000,  912500,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 900,     950000,  937500,  925000,  912500,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 800,     925000,  912500,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 700,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 600,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 500,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 400,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 300,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 200,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+}, {
+	/* ARM bin 2 */
+	{ 1800,    1237500, 1225000, 1212500, 1200000, 1187500, 1175000, 1162500,
+	  1150000, 1137500, 1150000, 1137500, 1125000, 1112500, 1100000 },
+	{ 1700,    1200000, 1187500, 1175000, 1162500, 1150000, 1137500, 1125000,
+	  1112500, 1100000, 1112500, 1100000, 1087500, 1075000, 1062500 },
+	{ 1600,    1162500, 1150000, 1137500, 1125000, 1112500, 1100000, 1087500,
+	  1075000, 1062500, 1075000, 1062500, 1050000, 1037500, 1025000 },
+	{ 1500,    1125000, 1112500, 1100000, 1087500, 1075000, 1062500, 1050000,
+	  1037500, 1025000, 1037500, 1025000, 1012500, 1000000, 987500 },
+	{ 1400,    1100000, 1087500, 1075000, 1062500, 1050000, 1037500, 1025000,
+	  1012500, 1000000, 1012500, 1000000, 987500,  975000,  962500 },
+	{ 1300,    1087500, 1075000, 1062500, 1050000, 1037500, 1025000, 1012500,
+	  1000000, 987500,  1000000, 987500,  975000,  962500,  950000 },
+	{ 1200,    1062500, 1050000, 1037500, 1025000, 1012500, 1000000, 987500,
+	  975000,  962500,  975000,  962500,  950000,  937500,  925000 },
+	{ 1100,    1037500, 1025000, 1012500, 1000000, 987500,  975000,  962500,
+	  950000,  937500,  950000,  937500,  925000,  912500,  900000 },
+	{ 1000,    1012500, 1000000, 987500,  975000,  962500,  950000,  937500,
+	  925000,  912500,  925000,  912500,  900000,  900000,  900000 },
+	{ 900,     987500,  975000,  962500,  950000,  937500,  925000,  912500,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 800,     962500,  950000,  937500,  925000,  912500,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 700,     937500,  925000,  912500,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 600,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 500,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 400,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 300,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 200,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+}
+};
+
+static const u32 asv_kfc_table[][ASV_KFC_DVFS_NUM][ASV_GROUPS_NUM + 1] = {
+{
+	/* KFC 0, 1 */
+	{ 1500000, 1300000, 1300000, 1300000, 1287500, 1287500, 1287500, 1275000,
+	  1262500, 1250000, 1237500, 1225000, 1212500, 1200000, 1187500 },
+	{ 1400000, 1275000, 1262500, 1250000, 1237500, 1225000, 1212500, 1200000,
+	  1187500, 1175000, 1162500, 1150000, 1137500, 1125000, 1112500 },
+	{ 1300000, 1225000, 1212500, 1200000, 1187500, 1175000, 1162500, 1150000,
+	  1137500, 1125000, 1112500, 1100000, 1087500, 1075000, 1062500 },
+	{ 1200000, 1175000, 1162500, 1150000, 1137500, 1125000, 1112500, 1100000,
+	  1087500, 1075000, 1062500, 1050000, 1037500, 1025000, 1012500 },
+	{ 1100000, 1137500, 1125000, 1112500, 1100000, 1087500, 1075000, 1062500,
+	  1050000, 1037500, 1025000, 1012500, 1000000, 987500,  975000 },
+	{ 1000000, 1100000, 1087500, 1075000, 1062500, 1050000, 1037500, 1025000,
+	  1012500, 1000000, 987500,  975000,  962500,  950000,  937500 },
+	{ 900000,  1062500, 1050000, 1037500, 1025000, 1012500, 1000000, 987500,
+	  975000,  962500,  950000,  937500,  925000,  912500,  900000 },
+	{ 800000,  1025000, 1012500, 1000000, 987500,  975000,  962500,  950000,
+	  937500,  925000,  912500,  900000,  900000,  900000,  900000 },
+	{ 700000,  987500,  975000,  962500,  950000,  937500,  925000,  912500,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 600000,  950000,  937500,  925000,  912500,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 500000,  912500,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 400000,  900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 300000,  900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 200000,  900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+}, {
+	/* KFC 2 */
+	{ 1500,    1300000, 1300000, 1300000, 1287500, 1287500, 1287500, 1275000,
+	  1262500, 1250000, 1237500, 1225000, 1212500, 1200000, 1187500 },
+	{ 1400,    1275000, 1262500, 1250000, 1237500, 1225000, 1212500, 1200000,
+	  1187500, 1175000, 1162500, 1150000, 1137500, 1125000, 1112500 },
+	{ 1300,    1225000, 1212500, 1200000, 1187500, 1175000, 1162500, 1150000,
+	  1137500, 1125000, 1112500, 1100000, 1087500, 1075000, 1062500 },
+	{ 1200,    1175000, 1162500, 1150000, 1137500, 1125000, 1112500, 1100000,
+	  1087500, 1075000, 1062500, 1050000, 1037500, 1025000, 1012500 },
+	{ 1100,    1137500, 1125000, 1112500, 1100000, 1087500, 1075000, 1062500,
+	  1050000, 1037500, 1025000, 1012500, 1000000, 987500,  975000 },
+	{ 1000,    1100000, 1087500, 1075000, 1062500, 1050000, 1037500, 1025000,
+	  1012500, 1000000, 987500,  975000,  962500,  950000,  937500 },
+	{ 900,     1062500, 1050000, 1037500, 1025000, 1012500, 1000000, 987500,
+	  975000,  962500,  950000,  937500,  925000,  912500,  900000 },
+	{ 800,     1025000, 1012500, 1000000, 987500,  975000,  962500,  950000,
+	  937500,  925000,  912500,  900000,  900000,  900000,  900000 },
+	{ 700,     987500,  975000,  962500,  950000,  937500,  925000,  912500,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 600,     950000,  937500,  925000,  912500,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 500,     912500,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 400,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 300,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 200,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+}, {
+	/* KFC 3 */
+	{ 1500,    1300000, 1300000, 1300000, 1287500, 1287500, 1287500, 1275000,
+	  1262500, 1250000, 1237500, 1225000, 1212500, 1200000, 1187500 },
+	{ 1400,    1275000, 1262500, 1250000, 1237500, 1225000, 1212500, 1200000,
+	  1187500, 1175000, 1162500, 1150000, 1137500, 1125000, 1112500 },
+	{ 1300,    1225000, 1212500, 1200000, 1187500, 1175000, 1162500, 1150000,
+	  1137500, 1125000, 1112500, 1100000, 1087500, 1075000, 1062500 },
+	{ 1200,    1175000, 1162500, 1150000, 1137500, 1125000, 1112500, 1100000,
+	  1087500, 1075000, 1062500, 1050000, 1037500, 1025000, 1012500 },
+	{ 1100,    1137500, 1125000, 1112500, 1100000, 1087500, 1075000, 1062500,
+	  1050000, 1037500, 1025000, 1012500, 1000000, 987500,  975000 },
+	{ 1000,    1100000, 1087500, 1075000, 1062500, 1050000, 1037500, 1025000,
+	  1012500, 1000000, 987500,  975000,  962500,  950000,  937500 },
+	{ 900,     1062500, 1050000, 1037500, 1025000, 1012500, 1000000, 987500,
+	  975000,  962500,  950000,  937500,  925000,  912500,  900000 },
+	{ 800,     1025000, 1012500, 1000000, 987500,  975000,  962500,  950000,
+	  937500,  925000,  912500,  900000,  900000,  900000,  900000 },
+	{ 700,     987500,  975000,  962500,  950000,  937500,  925000,  912500,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 600,     950000,  937500,  925000,  912500,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 500,     912500,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 400,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 300,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 200,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+}, {
+	/* KFC bin 2 */
+	{ 1300,    1250000, 1237500, 1225000, 1212500, 1200000, 1187500, 1175000,
+	  1162500, 1150000, 1137500, 1125000, 1112500, 1100000, 1087500 },
+	{ 1200,    1200000, 1187500, 1175000, 1162500, 1150000, 1137500, 1125000,
+	  1112500, 1100000, 1087500, 1075000, 1062500, 1050000, 1037500 },
+	{ 1100,    1162500, 1150000, 1137500, 1125000, 1112500, 1100000, 1087500,
+	  1075000, 1062500, 1050000, 1037500, 1025000, 1012500, 1000000 },
+	{ 1000,    1125000, 1112500, 1100000, 1087500, 1075000, 1062500, 1050000,
+	  1037500, 1025000, 1012500, 1000000, 987500,  975000,  962500 },
+	{ 900,     1087500, 1075000, 1062500, 1050000, 1037500, 1025000, 1012500,
+	  1000000, 987500,  975000,  962500,  950000,  937500,  925000 },
+	{ 800,     1050000, 1037500, 1025000, 1012500, 1000000, 987500,  975000,
+	  962500,  950000,  937500,  925000,  912500,  900000,  900000 },
+	{ 700,     1012500, 1000000, 987500,  975000,  962500,  950000,  937500,
+	  925000,  912500,  900000,  900000,  900000,  900000,  900000 },
+	{ 600,     975000,  962500,  950000,  937500,  925000,  912500,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 500,     937500,  925000,  912500,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 400,     925000,  912500,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 300,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+	{ 200,     900000,  900000,  900000,  900000,  900000,  900000,  900000,
+	  900000,  900000,  900000,  900000,  900000,  900000,  900000 },
+}
+};
+
+static const struct asv_limit_entry __asv_limits[ASV_GROUPS_NUM] = {
+	{ 13, 55 },
+	{ 21, 65 },
+	{ 25, 69 },
+	{ 30, 72 },
+	{ 36, 74 },
+	{ 43, 76 },
+	{ 51, 78 },
+	{ 65, 80 },
+	{ 81, 82 },
+	{ 98, 84 },
+	{ 119, 87 },
+	{ 135, 89 },
+	{ 150, 92 },
+	{ 999, 999 },
+};
+
+static int exynos5422_asv_get_group(struct exynos_asv *asv)
+{
+	unsigned int pkgid_reg, auxi_reg;
+	int hpm, ids, i;
+
+	regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PKG_ID, &pkgid_reg);
+	regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_AUX_INFO, &auxi_reg);
+
+	if (asv->use_sg) {
+		u32 sga = (pkgid_reg >> EXYNOS5422_SG_A_OFFSET) &
+			   EXYNOS5422_SG_A_MASK;
+
+		u32 sgb = (pkgid_reg >> EXYNOS5422_SG_B_OFFSET) &
+			   EXYNOS5422_SG_B_MASK;
+
+		if ((pkgid_reg >> EXYNOS5422_SG_BSIGN_OFFSET) &
+		     EXYNOS5422_SG_BSIGN_MASK)
+			return sga + sgb;
+		else
+			return sga - sgb;
+	}
+
+	hpm = (auxi_reg >> EXYNOS5422_TMCB_OFFSET) & EXYNOS5422_TMCB_MASK;
+	ids = (pkgid_reg >> EXYNOS5422_IDS_OFFSET) & EXYNOS5422_IDS_MASK;
+
+	for (i = 0; i < ASV_GROUPS_NUM; i++) {
+		if (ids <= __asv_limits[i].ids)
+			break;
+		if (hpm <= __asv_limits[i].hpm)
+			break;
+	}
+	if (i < ASV_GROUPS_NUM)
+		return i;
+
+	return 0;
+}
+
+static int __asv_offset_voltage(unsigned int index)
+{
+	switch (index) {
+	case 1:
+		return 12500;
+	case 2:
+		return 50000;
+	case 3:
+		return 25000;
+	default:
+		return 0;
+	};
+}
+
+static void exynos5422_asv_offset_voltage_setup(struct exynos_asv *asv)
+{
+	struct exynos_asv_subsys *subsys;
+	unsigned int reg, value;
+
+	regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_AUX_INFO, &reg);
+
+	/* ARM offset voltage setup */
+	subsys = &asv->subsys[EXYNOS_ASV_SUBSYS_ID_ARM];
+
+	subsys->base_volt = 1000000;
+
+	value = (reg >> EXYNOS5422_ARM_UP_OFFSET) & EXYNOS5422_ARM_UP_MASK;
+	subsys->offset_volt_h = __asv_offset_voltage(value);
+
+	value = (reg >> EXYNOS5422_ARM_DN_OFFSET) & EXYNOS5422_ARM_DN_MASK;
+	subsys->offset_volt_l = __asv_offset_voltage(value);
+
+	/* KFC offset voltage setup */
+	subsys = &asv->subsys[EXYNOS_ASV_SUBSYS_ID_KFC];
+
+	subsys->base_volt = 1000000;
+
+	value = (reg >> EXYNOS5422_KFC_UP_OFFSET) & EXYNOS5422_KFC_UP_MASK;
+	subsys->offset_volt_h = __asv_offset_voltage(value);
+
+	value = (reg >> EXYNOS5422_KFC_DN_OFFSET) & EXYNOS5422_KFC_DN_MASK;
+	subsys->offset_volt_l = __asv_offset_voltage(value);
+}
+
+static int exynos5422_asv_opp_get_voltage(struct exynos_asv_subsys *subsys,
+				int level, unsigned int volt)
+{
+	unsigned int asv_volt;
+
+	if (level >= subsys->table.num_rows)
+		return volt;
+
+	asv_volt = exynos_asv_opp_get_voltage(subsys, level,
+					      subsys->asv->group);
+
+	if (volt > subsys->base_volt)
+		asv_volt += subsys->offset_volt_h;
+	else
+		asv_volt += subsys->offset_volt_l;
+
+	return asv_volt;
+}
+
+static unsigned int exynos5422_asv_parse_table(struct exynos_asv *asv,
+				      unsigned int pkg_id)
+{
+	return (pkg_id >> EXYNOS5422_TABLE_OFFSET) & EXYNOS5422_TABLE_MASK;
+}
+
+static bool exynos5422_asv_parse_bin2(struct exynos_asv *asv,
+				     unsigned int pkg_id)
+{
+	return (pkg_id >> EXYNOS5422_BIN2_OFFSET) & EXYNOS5422_BIN2_MASK;
+}
+
+static bool exynos5422_asv_parse_sg(struct exynos_asv *asv,
+					unsigned int pkg_id)
+{
+	return ((pkg_id >> EXYNOS5422_USESG_OFFSET) & EXYNOS5422_USESG_MASK);
+}
+
+int exynos5422_asv_init(struct exynos_asv *asv)
+{
+	struct exynos_asv_subsys *subsys;
+	unsigned int table_index;
+	unsigned int pkg_id;
+	bool bin2;
+
+	regmap_read(asv->chipid_regmap, EXYNOS_CHIPID_REG_PKG_ID, &pkg_id);
+
+	if (asv->of_bin == 2) {
+		bin2 = true;
+		asv->use_sg = false;
+	} else {
+		asv->use_sg = exynos5422_asv_parse_sg(asv, pkg_id);
+		bin2 = exynos5422_asv_parse_bin2(asv, pkg_id);
+	}
+
+	asv->group = exynos5422_asv_get_group(asv);
+	asv->table = exynos5422_asv_parse_table(asv, pkg_id);
+
+	exynos5422_asv_offset_voltage_setup(asv);
+
+	if (bin2) {
+		table_index = 3;
+	} else {
+		if (asv->table == 2 || asv->table == 3)
+			table_index = asv->table - 1;
+		else
+			table_index = 0;
+	}
+
+	subsys = &asv->subsys[EXYNOS_ASV_SUBSYS_ID_ARM];
+	subsys->cpu_dt_compat = "arm,cortex-a15";
+	if (bin2)
+		subsys->table.num_rows = ASV_ARM_BIN2_DVFS_NUM;
+	else
+		subsys->table.num_rows = ASV_ARM_DVFS_NUM;
+	subsys->table.num_cols = ASV_GROUPS_NUM + 1;
+	subsys->table.buf = (u32 *)asv_arm_table[table_index];
+
+	subsys = &asv->subsys[EXYNOS_ASV_SUBSYS_ID_KFC];
+	subsys->cpu_dt_compat = "arm,cortex-a7";
+	if (bin2)
+		subsys->table.num_rows = ASV_KFC_BIN2_DVFS_NUM;
+	else
+		subsys->table.num_rows = ASV_KFC_DVFS_NUM;
+	subsys->table.num_cols = ASV_GROUPS_NUM + 1;
+	subsys->table.buf = (u32 *)asv_kfc_table[table_index];
+
+	asv->opp_get_voltage = exynos5422_asv_opp_get_voltage;
+
+	return 0;
+}
diff --git a/drivers/soc/samsung/exynos5422-asv.h b/drivers/soc/samsung/exynos5422-asv.h
new file mode 100644
index 000000000000..d8f108fcc39b
--- /dev/null
+++ b/drivers/soc/samsung/exynos5422-asv.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd.
+ *	      http://www.samsung.com/
+ *
+ * Samsung Exynos 5422 SoC Adaptive Supply Voltage support
+ */
+
+#ifndef __EXYNOS5422_ASV_H
+#define __EXYNOS5422_ASV_H
+
+#include <linux/errno.h>
+
+struct exynos_asv;
+
+#ifdef CONFIG_EXYNOS_ASV_ARM
+int exynos5422_asv_init(struct exynos_asv *asv);
+#else
+static inline int exynos5422_asv_init(struct exynos_asv *asv)
+{
+	return -ENOTSUPP;
+}
+#endif
+
+#endif /* __EXYNOS5422_ASV_H */
-- 
2.17.1