Resguardo inicial

linux-7.2.3/drivers/devfreq/event/Kconfig

@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig PM_DEVFREQ_EVENT
+	bool "DEVFREQ-Event device Support"
+	help
+	  The devfreq-event device provide the raw data and events which
+	  indicate the current state of devfreq-event device. The provided
+	  data from devfreq-event device is used to monitor the state of
+	  device and determine the suitable size of resource to reduce the
+	  wasted resource.
+
+	  The devfreq-event device can support the various type of events
+	  (e.g., raw data, utilization, latency, bandwidth). The events
+	  may be used by devfreq governor and other subsystem.
+
+if PM_DEVFREQ_EVENT
+
+config DEVFREQ_EVENT_EXYNOS_NOCP
+	tristate "Exynos NoC (Network On Chip) Probe DEVFREQ event Driver"
+	depends on ARCH_EXYNOS || COMPILE_TEST
+	select PM_OPP
+	select REGMAP_MMIO
+	help
+	  This add the devfreq-event driver for Exynos SoC. It provides NoC
+	  (Network on Chip) Probe counters to measure the bandwidth of AXI bus.
+
+config DEVFREQ_EVENT_EXYNOS_PPMU
+	tristate "Exynos PPMU (Platform Performance Monitoring Unit) DEVFREQ event Driver"
+	depends on ARCH_EXYNOS || COMPILE_TEST
+	select PM_OPP
+	help
+	  This add the devfreq-event driver for Exynos SoC. It provides PPMU
+	  (Platform Performance Monitoring Unit) counters to estimate the
+	  utilization of each module.
+
+config DEVFREQ_EVENT_ROCKCHIP_DFI
+	tristate "ROCKCHIP DFI DEVFREQ event Driver"
+	depends on ARCH_ROCKCHIP || COMPILE_TEST
+	help
+	  This add the devfreq-event driver for Rockchip SoC. It provides DFI
+	  (DDR Monitor Module) driver to count ddr load.
+
+endif # PM_DEVFREQ_EVENT

linux-7.2.3/drivers/devfreq/event/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Exynos DEVFREQ Event Drivers
+
+obj-$(CONFIG_DEVFREQ_EVENT_EXYNOS_NOCP) += exynos-nocp.o
+obj-$(CONFIG_DEVFREQ_EVENT_EXYNOS_PPMU) += exynos-ppmu.o
+obj-$(CONFIG_DEVFREQ_EVENT_ROCKCHIP_DFI) += rockchip-dfi.o

linux-7.2.3/drivers/devfreq/event/exynos-nocp.c

@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * exynos-nocp.c - Exynos NoC (Network On Chip) Probe support
+ *
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd.
+ * Author : Chanwoo Choi <cw00.choi@samsung.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/devfreq-event.h>
+#include <linux/kernel.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "exynos-nocp.h"
+
+struct exynos_nocp {
+	struct devfreq_event_dev *edev;
+	struct devfreq_event_desc desc;
+
+	struct device *dev;
+
+	struct regmap *regmap;
+	struct clk *clk;
+};
+
+/*
+ * The devfreq-event ops structure for nocp probe.
+ */
+static int exynos_nocp_set_event(struct devfreq_event_dev *edev)
+{
+	struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
+	int ret;
+
+	/* Disable NoC probe */
+	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
+				NOCP_MAIN_CTL_STATEN_MASK, 0);
+	if (ret < 0) {
+		dev_err(nocp->dev, "failed to disable the NoC probe device\n");
+		return ret;
+	}
+
+	/* Set a statistics dump period to 0 */
+	ret = regmap_write(nocp->regmap, NOCP_STAT_PERIOD, 0x0);
+	if (ret < 0)
+		goto out;
+
+	/* Set the IntEvent fields of *_SRC */
+	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_SRC,
+				NOCP_CNT_SRC_INTEVENT_MASK,
+				NOCP_CNT_SRC_INTEVENT_BYTE_MASK);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_SRC,
+				NOCP_CNT_SRC_INTEVENT_MASK,
+				NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_SRC,
+				NOCP_CNT_SRC_INTEVENT_MASK,
+				NOCP_CNT_SRC_INTEVENT_CYCLE_MASK);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_SRC,
+				NOCP_CNT_SRC_INTEVENT_MASK,
+				NOCP_CNT_SRC_INTEVENT_CHAIN_MASK);
+	if (ret < 0)
+		goto out;
+
+
+	/* Set an alarm with a max/min value of 0 to generate StatALARM */
+	ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MIN, 0x0);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MAX, 0x0);
+	if (ret < 0)
+		goto out;
+
+	/* Set AlarmMode */
+	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_0_ALARM_MODE,
+				NOCP_CNT_ALARM_MODE_MASK,
+				NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_1_ALARM_MODE,
+				NOCP_CNT_ALARM_MODE_MASK,
+				NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_ALARM_MODE,
+				NOCP_CNT_ALARM_MODE_MASK,
+				NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_ALARM_MODE,
+				NOCP_CNT_ALARM_MODE_MASK,
+				NOCP_CNT_ALARM_MODE_MIN_MAX_MASK);
+	if (ret < 0)
+		goto out;
+
+	/* Enable the measurements by setting AlarmEn and StatEn */
+	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
+			NOCP_MAIN_CTL_STATEN_MASK | NOCP_MAIN_CTL_ALARMEN_MASK,
+			NOCP_MAIN_CTL_STATEN_MASK | NOCP_MAIN_CTL_ALARMEN_MASK);
+	if (ret < 0)
+		goto out;
+
+	/* Set GlobalEN */
+	ret = regmap_update_bits(nocp->regmap, NOCP_CFG_CTL,
+				NOCP_CFG_CTL_GLOBALEN_MASK,
+				NOCP_CFG_CTL_GLOBALEN_MASK);
+	if (ret < 0)
+		goto out;
+
+	/* Enable NoC probe */
+	ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
+				NOCP_MAIN_CTL_STATEN_MASK,
+				NOCP_MAIN_CTL_STATEN_MASK);
+	if (ret < 0)
+		goto out;
+
+	return 0;
+
+out:
+	/* Reset NoC probe */
+	if (regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL,
+				NOCP_MAIN_CTL_STATEN_MASK, 0)) {
+		dev_err(nocp->dev, "Failed to reset NoC probe device\n");
+	}
+
+	return ret;
+}
+
+static int exynos_nocp_get_event(struct devfreq_event_dev *edev,
+				struct devfreq_event_data *edata)
+{
+	struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev);
+	unsigned int counter[4];
+	int ret;
+
+	/* Read cycle count */
+	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_0_VAL, &counter[0]);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_1_VAL, &counter[1]);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_2_VAL, &counter[2]);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_read(nocp->regmap, NOCP_COUNTERS_3_VAL, &counter[3]);
+	if (ret < 0)
+		goto out;
+
+	edata->load_count = ((counter[1] << 16) | counter[0]);
+	edata->total_count = ((counter[3] << 16) | counter[2]);
+
+	dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
+					edata->load_count, edata->total_count);
+
+	return 0;
+
+out:
+	dev_err(nocp->dev, "Failed to read the counter of NoC probe device\n");
+
+	return ret;
+}
+
+static const struct devfreq_event_ops exynos_nocp_ops = {
+	.set_event = exynos_nocp_set_event,
+	.get_event = exynos_nocp_get_event,
+};
+
+static const struct of_device_id exynos_nocp_id_match[] = {
+	{ .compatible = "samsung,exynos5420-nocp", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, exynos_nocp_id_match);
+
+static struct regmap_config exynos_nocp_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = NOCP_COUNTERS_3_VAL,
+};
+
+static int exynos_nocp_parse_dt(struct platform_device *pdev,
+				struct exynos_nocp *nocp)
+{
+	struct device *dev = nocp->dev;
+	struct device_node *np = dev->of_node;
+	struct resource *res;
+	void __iomem *base;
+
+	if (!np) {
+		dev_err(dev, "failed to find devicetree node\n");
+		return -EINVAL;
+	}
+
+	nocp->clk = devm_clk_get(dev, "nocp");
+	if (IS_ERR(nocp->clk))
+		nocp->clk = NULL;
+
+	/* Maps the memory mapped IO to control nocp register */
+	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	exynos_nocp_regmap_config.max_register = resource_size(res) - 4;
+
+	nocp->regmap = devm_regmap_init_mmio(dev, base,
+					&exynos_nocp_regmap_config);
+	if (IS_ERR(nocp->regmap)) {
+		dev_err(dev, "failed to initialize regmap\n");
+		return PTR_ERR(nocp->regmap);
+	}
+
+	return 0;
+}
+
+static int exynos_nocp_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct exynos_nocp *nocp;
+	int ret;
+
+	nocp = devm_kzalloc(&pdev->dev, sizeof(*nocp), GFP_KERNEL);
+	if (!nocp)
+		return -ENOMEM;
+
+	nocp->dev = &pdev->dev;
+
+	/* Parse dt data to get resource */
+	ret = exynos_nocp_parse_dt(pdev, nocp);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"failed to parse devicetree for resource\n");
+		return ret;
+	}
+
+	/* Add devfreq-event device to measure the bandwidth of NoC */
+	nocp->desc.ops = &exynos_nocp_ops;
+	nocp->desc.driver_data = nocp;
+	nocp->desc.name = np->full_name;
+	nocp->edev = devm_devfreq_event_add_edev(&pdev->dev, &nocp->desc);
+	if (IS_ERR(nocp->edev)) {
+		dev_err(&pdev->dev,
+			"failed to add devfreq-event device\n");
+		return PTR_ERR(nocp->edev);
+	}
+	platform_set_drvdata(pdev, nocp);
+
+	ret = clk_prepare_enable(nocp->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to prepare ppmu clock\n");
+		return ret;
+	}
+
+	pr_info("exynos-nocp: new NoC Probe device registered: %s\n",
+			dev_name(dev));
+
+	return 0;
+}
+
+static void exynos_nocp_remove(struct platform_device *pdev)
+{
+	struct exynos_nocp *nocp = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(nocp->clk);
+}
+
+static struct platform_driver exynos_nocp_driver = {
+	.probe	= exynos_nocp_probe,
+	.remove = exynos_nocp_remove,
+	.driver = {
+		.name	= "exynos-nocp",
+		.of_match_table = exynos_nocp_id_match,
+	},
+};
+module_platform_driver(exynos_nocp_driver);
+
+MODULE_DESCRIPTION("Exynos NoC (Network on Chip) Probe driver");
+MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
+MODULE_LICENSE("GPL");

linux-7.2.3/drivers/devfreq/event/exynos-nocp.h

@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * exynos-nocp.h - Exynos NoC (Network on Chip) Probe header file
+ *
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd.
+ * Author : Chanwoo Choi <cw00.choi@samsung.com>
+ */
+
+#ifndef __EXYNOS_NOCP_H__
+#define __EXYNOS_NOCP_H__
+
+enum nocp_reg {
+	NOCP_ID_REVISION_ID		= 0x04,
+	NOCP_MAIN_CTL			= 0x08,
+	NOCP_CFG_CTL			= 0x0C,
+
+	NOCP_STAT_PERIOD		= 0x24,
+	NOCP_STAT_GO			= 0x28,
+	NOCP_STAT_ALARM_MIN		= 0x2C,
+	NOCP_STAT_ALARM_MAX		= 0x30,
+	NOCP_STAT_ALARM_STATUS		= 0x34,
+	NOCP_STAT_ALARM_CLR		= 0x38,
+
+	NOCP_COUNTERS_0_SRC		= 0x138,
+	NOCP_COUNTERS_0_ALARM_MODE	= 0x13C,
+	NOCP_COUNTERS_0_VAL		= 0x140,
+
+	NOCP_COUNTERS_1_SRC		= 0x14C,
+	NOCP_COUNTERS_1_ALARM_MODE	= 0x150,
+	NOCP_COUNTERS_1_VAL		= 0x154,
+
+	NOCP_COUNTERS_2_SRC		= 0x160,
+	NOCP_COUNTERS_2_ALARM_MODE	= 0x164,
+	NOCP_COUNTERS_2_VAL		= 0x168,
+
+	NOCP_COUNTERS_3_SRC		= 0x174,
+	NOCP_COUNTERS_3_ALARM_MODE	= 0x178,
+	NOCP_COUNTERS_3_VAL		= 0x17C,
+};
+
+/* NOCP_MAIN_CTL register */
+#define NOCP_MAIN_CTL_ERREN_MASK		BIT(0)
+#define NOCP_MAIN_CTL_TRACEEN_MASK		BIT(1)
+#define NOCP_MAIN_CTL_PAYLOADEN_MASK		BIT(2)
+#define NOCP_MAIN_CTL_STATEN_MASK		BIT(3)
+#define NOCP_MAIN_CTL_ALARMEN_MASK		BIT(4)
+#define NOCP_MAIN_CTL_STATCONDDUMP_MASK	BIT(5)
+#define NOCP_MAIN_CTL_INTRUSIVEMODE_MASK	BIT(6)
+
+/* NOCP_CFG_CTL register */
+#define NOCP_CFG_CTL_GLOBALEN_MASK		BIT(0)
+#define NOCP_CFG_CTL_ACTIVE_MASK		BIT(1)
+
+/* NOCP_COUNTERS_x_SRC register */
+#define NOCP_CNT_SRC_INTEVENT_SHIFT		0
+#define NOCP_CNT_SRC_INTEVENT_MASK		(0x1F << NOCP_CNT_SRC_INTEVENT_SHIFT)
+#define NOCP_CNT_SRC_INTEVENT_OFF_MASK		(0x0 << NOCP_CNT_SRC_INTEVENT_SHIFT)
+#define NOCP_CNT_SRC_INTEVENT_CYCLE_MASK	(0x1 << NOCP_CNT_SRC_INTEVENT_SHIFT)
+#define NOCP_CNT_SRC_INTEVENT_IDLE_MASK		(0x2 << NOCP_CNT_SRC_INTEVENT_SHIFT)
+#define NOCP_CNT_SRC_INTEVENT_XFER_MASK		(0x3 << NOCP_CNT_SRC_INTEVENT_SHIFT)
+#define NOCP_CNT_SRC_INTEVENT_BUSY_MASK		(0x4 << NOCP_CNT_SRC_INTEVENT_SHIFT)
+#define NOCP_CNT_SRC_INTEVENT_WAIT_MASK		(0x5 << NOCP_CNT_SRC_INTEVENT_SHIFT)
+#define NOCP_CNT_SRC_INTEVENT_PKT_MASK		(0x6 << NOCP_CNT_SRC_INTEVENT_SHIFT)
+#define NOCP_CNT_SRC_INTEVENT_BYTE_MASK		(0x8 << NOCP_CNT_SRC_INTEVENT_SHIFT)
+#define NOCP_CNT_SRC_INTEVENT_CHAIN_MASK	(0x10 << NOCP_CNT_SRC_INTEVENT_SHIFT)
+
+/* NOCP_COUNTERS_x_ALARM_MODE register */
+#define NOCP_CNT_ALARM_MODE_SHIFT		0
+#define NOCP_CNT_ALARM_MODE_MASK		(0x3 << NOCP_CNT_ALARM_MODE_SHIFT)
+#define NOCP_CNT_ALARM_MODE_OFF_MASK		(0x0 << NOCP_CNT_ALARM_MODE_SHIFT)
+#define NOCP_CNT_ALARM_MODE_MIN_MASK		(0x1 << NOCP_CNT_ALARM_MODE_SHIFT)
+#define NOCP_CNT_ALARM_MODE_MAX_MASK		(0x2 << NOCP_CNT_ALARM_MODE_SHIFT)
+#define NOCP_CNT_ALARM_MODE_MIN_MAX_MASK	(0x3 << NOCP_CNT_ALARM_MODE_SHIFT)
+
+#endif /* __EXYNOS_NOCP_H__ */

linux-7.2.3/drivers/devfreq/event/exynos-ppmu.c

@@ -0,0 +1,714 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * exynos_ppmu.c - Exynos PPMU (Platform Performance Monitoring Unit) support
+ *
+ * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd.
+ * Author : Chanwoo Choi <cw00.choi@samsung.com>
+ *
+ * This driver is based on drivers/devfreq/exynos/exynos_ppmu.c
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/suspend.h>
+#include <linux/devfreq-event.h>
+
+#include "exynos-ppmu.h"
+
+enum exynos_ppmu_type {
+	EXYNOS_TYPE_PPMU,
+	EXYNOS_TYPE_PPMU_V2,
+};
+
+struct exynos_ppmu_data {
+	struct clk *clk;
+};
+
+struct exynos_ppmu {
+	struct devfreq_event_dev **edev;
+	struct devfreq_event_desc *desc;
+	unsigned int num_events;
+
+	struct device *dev;
+	struct regmap *regmap;
+
+	struct exynos_ppmu_data ppmu;
+	enum exynos_ppmu_type ppmu_type;
+};
+
+#define PPMU_EVENT(name)			\
+	{ "ppmu-event0-"#name, PPMU_PMNCNT0 },	\
+	{ "ppmu-event1-"#name, PPMU_PMNCNT1 },	\
+	{ "ppmu-event2-"#name, PPMU_PMNCNT2 },	\
+	{ "ppmu-event3-"#name, PPMU_PMNCNT3 }
+
+static struct __exynos_ppmu_events {
+	char *name;
+	int id;
+} ppmu_events[] = {
+	/* For Exynos3250, Exynos4 and Exynos5260 */
+	PPMU_EVENT(g3d),
+	PPMU_EVENT(fsys),
+
+	/* For Exynos4 SoCs and Exynos3250 */
+	PPMU_EVENT(dmc0),
+	PPMU_EVENT(dmc1),
+	PPMU_EVENT(cpu),
+	PPMU_EVENT(rightbus),
+	PPMU_EVENT(leftbus),
+	PPMU_EVENT(lcd0),
+	PPMU_EVENT(camif),
+
+	/* Only for Exynos3250 and Exynos5260 */
+	PPMU_EVENT(mfc),
+
+	/* Only for Exynos4 SoCs */
+	PPMU_EVENT(mfc-left),
+	PPMU_EVENT(mfc-right),
+
+	/* Only for Exynos5260 SoCs */
+	PPMU_EVENT(drex0-s0),
+	PPMU_EVENT(drex0-s1),
+	PPMU_EVENT(drex1-s0),
+	PPMU_EVENT(drex1-s1),
+	PPMU_EVENT(eagle),
+	PPMU_EVENT(kfc),
+	PPMU_EVENT(isp),
+	PPMU_EVENT(fimc),
+	PPMU_EVENT(gscl),
+	PPMU_EVENT(mscl),
+	PPMU_EVENT(fimd0x),
+	PPMU_EVENT(fimd1x),
+
+	/* Only for Exynos5433 SoCs */
+	PPMU_EVENT(d0-cpu),
+	PPMU_EVENT(d0-general),
+	PPMU_EVENT(d0-rt),
+	PPMU_EVENT(d1-cpu),
+	PPMU_EVENT(d1-general),
+	PPMU_EVENT(d1-rt),
+
+	/* For Exynos5422 SoC, deprecated (backwards compatible) */
+	PPMU_EVENT(dmc0_0),
+	PPMU_EVENT(dmc0_1),
+	PPMU_EVENT(dmc1_0),
+	PPMU_EVENT(dmc1_1),
+	/* For Exynos5422 SoC */
+	PPMU_EVENT(dmc0-0),
+	PPMU_EVENT(dmc0-1),
+	PPMU_EVENT(dmc1-0),
+	PPMU_EVENT(dmc1-1),
+};
+
+static int __exynos_ppmu_find_ppmu_id(const char *edev_name)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ppmu_events); i++)
+		if (!strcmp(edev_name, ppmu_events[i].name))
+			return ppmu_events[i].id;
+
+	return -EINVAL;
+}
+
+static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
+{
+	return __exynos_ppmu_find_ppmu_id(edev->desc->name);
+}
+
+/*
+ * The devfreq-event ops structure for PPMU v1.1
+ */
+static int exynos_ppmu_disable(struct devfreq_event_dev *edev)
+{
+	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
+	int ret;
+	u32 pmnc;
+
+	/* Disable all counters */
+	ret = regmap_write(info->regmap, PPMU_CNTENC,
+				PPMU_CCNT_MASK |
+				PPMU_PMCNT0_MASK |
+				PPMU_PMCNT1_MASK |
+				PPMU_PMCNT2_MASK |
+				PPMU_PMCNT3_MASK);
+	if (ret < 0)
+		return ret;
+
+	/* Disable PPMU */
+	ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
+	if (ret < 0)
+		return ret;
+
+	pmnc &= ~PPMU_PMNC_ENABLE_MASK;
+	ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int exynos_ppmu_set_event(struct devfreq_event_dev *edev)
+{
+	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
+	int id = exynos_ppmu_find_ppmu_id(edev);
+	int ret;
+	u32 pmnc, cntens;
+
+	if (id < 0)
+		return id;
+
+	/* Enable specific counter */
+	ret = regmap_read(info->regmap, PPMU_CNTENS, &cntens);
+	if (ret < 0)
+		return ret;
+
+	cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
+	ret = regmap_write(info->regmap, PPMU_CNTENS, cntens);
+	if (ret < 0)
+		return ret;
+
+	/* Set the event of proper data type monitoring */
+	ret = regmap_write(info->regmap, PPMU_BEVTxSEL(id),
+			   edev->desc->event_type);
+	if (ret < 0)
+		return ret;
+
+	/* Reset cycle counter/performance counter and enable PPMU */
+	ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
+	if (ret < 0)
+		return ret;
+
+	pmnc &= ~(PPMU_PMNC_ENABLE_MASK
+			| PPMU_PMNC_COUNTER_RESET_MASK
+			| PPMU_PMNC_CC_RESET_MASK);
+	pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
+	pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
+	pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
+	ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int exynos_ppmu_get_event(struct devfreq_event_dev *edev,
+				struct devfreq_event_data *edata)
+{
+	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
+	int id = exynos_ppmu_find_ppmu_id(edev);
+	unsigned int total_count, load_count;
+	unsigned int pmcnt3_high, pmcnt3_low;
+	unsigned int pmnc, cntenc;
+	int ret;
+
+	if (id < 0)
+		return -EINVAL;
+
+	/* Disable PPMU */
+	ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
+	if (ret < 0)
+		return ret;
+
+	pmnc &= ~PPMU_PMNC_ENABLE_MASK;
+	ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
+	if (ret < 0)
+		return ret;
+
+	/* Read cycle count */
+	ret = regmap_read(info->regmap, PPMU_CCNT, &total_count);
+	if (ret < 0)
+		return ret;
+	edata->total_count = total_count;
+
+	/* Read performance count */
+	switch (id) {
+	case PPMU_PMNCNT0:
+	case PPMU_PMNCNT1:
+	case PPMU_PMNCNT2:
+		ret = regmap_read(info->regmap, PPMU_PMNCT(id), &load_count);
+		if (ret < 0)
+			return ret;
+		edata->load_count = load_count;
+		break;
+	case PPMU_PMNCNT3:
+		ret = regmap_read(info->regmap, PPMU_PMCNT3_HIGH, &pmcnt3_high);
+		if (ret < 0)
+			return ret;
+
+		ret = regmap_read(info->regmap, PPMU_PMCNT3_LOW, &pmcnt3_low);
+		if (ret < 0)
+			return ret;
+
+		edata->load_count = ((pmcnt3_high << 8) | pmcnt3_low);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Disable specific counter */
+	ret = regmap_read(info->regmap, PPMU_CNTENC, &cntenc);
+	if (ret < 0)
+		return ret;
+
+	cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
+	ret = regmap_write(info->regmap, PPMU_CNTENC, cntenc);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
+					edata->load_count, edata->total_count);
+
+	return 0;
+}
+
+static const struct devfreq_event_ops exynos_ppmu_ops = {
+	.disable = exynos_ppmu_disable,
+	.set_event = exynos_ppmu_set_event,
+	.get_event = exynos_ppmu_get_event,
+};
+
+/*
+ * The devfreq-event ops structure for PPMU v2.0
+ */
+static int exynos_ppmu_v2_disable(struct devfreq_event_dev *edev)
+{
+	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
+	int ret;
+	u32 pmnc, clear;
+
+	/* Disable all counters */
+	clear = (PPMU_CCNT_MASK | PPMU_PMCNT0_MASK | PPMU_PMCNT1_MASK
+		| PPMU_PMCNT2_MASK | PPMU_PMCNT3_MASK);
+	ret = regmap_write(info->regmap, PPMU_V2_FLAG, clear);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_INTENC, clear);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CNTENC, clear);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CNT_RESET, clear);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG0, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG1, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG2, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CIG_RESULT, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CNT_AUTO, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CH_EV0_TYPE, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CH_EV1_TYPE, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CH_EV2_TYPE, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_CH_EV3_TYPE, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_SM_ID_V, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_SM_ID_A, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_V, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_A, 0x0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(info->regmap, PPMU_V2_INTERRUPT_RESET, 0x0);
+	if (ret < 0)
+		return ret;
+
+	/* Disable PPMU */
+	ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
+	if (ret < 0)
+		return ret;
+
+	pmnc &= ~PPMU_PMNC_ENABLE_MASK;
+	ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
+{
+	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
+	unsigned int pmnc, cntens;
+	int id = exynos_ppmu_find_ppmu_id(edev);
+	int ret;
+
+	/* Enable all counters */
+	ret = regmap_read(info->regmap, PPMU_V2_CNTENS, &cntens);
+	if (ret < 0)
+		return ret;
+
+	cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
+	ret = regmap_write(info->regmap, PPMU_V2_CNTENS, cntens);
+	if (ret < 0)
+		return ret;
+
+	/* Set the event of proper data type monitoring */
+	ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
+			   edev->desc->event_type);
+	if (ret < 0)
+		return ret;
+
+	/* Reset cycle counter/performance counter and enable PPMU */
+	ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
+	if (ret < 0)
+		return ret;
+
+	pmnc &= ~(PPMU_PMNC_ENABLE_MASK
+			| PPMU_PMNC_COUNTER_RESET_MASK
+			| PPMU_PMNC_CC_RESET_MASK
+			| PPMU_PMNC_CC_DIVIDER_MASK
+			| PPMU_V2_PMNC_START_MODE_MASK);
+	pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
+	pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
+	pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
+	pmnc |= (PPMU_V2_MODE_MANUAL << PPMU_V2_PMNC_START_MODE_SHIFT);
+
+	ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int exynos_ppmu_v2_get_event(struct devfreq_event_dev *edev,
+				    struct devfreq_event_data *edata)
+{
+	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
+	int id = exynos_ppmu_find_ppmu_id(edev);
+	int ret;
+	unsigned int pmnc, cntenc;
+	unsigned int pmcnt_high, pmcnt_low;
+	unsigned int total_count, count;
+	unsigned long load_count = 0;
+
+	/* Disable PPMU */
+	ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
+	if (ret < 0)
+		return ret;
+
+	pmnc &= ~PPMU_PMNC_ENABLE_MASK;
+	ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
+	if (ret < 0)
+		return ret;
+
+	/* Read cycle count and performance count */
+	ret = regmap_read(info->regmap, PPMU_V2_CCNT, &total_count);
+	if (ret < 0)
+		return ret;
+	edata->total_count = total_count;
+
+	switch (id) {
+	case PPMU_PMNCNT0:
+	case PPMU_PMNCNT1:
+	case PPMU_PMNCNT2:
+		ret = regmap_read(info->regmap, PPMU_V2_PMNCT(id), &count);
+		if (ret < 0)
+			return ret;
+		load_count = count;
+		break;
+	case PPMU_PMNCNT3:
+		ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_HIGH,
+						&pmcnt_high);
+		if (ret < 0)
+			return ret;
+
+		ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_LOW, &pmcnt_low);
+		if (ret < 0)
+			return ret;
+
+		load_count = ((u64)((pmcnt_high & 0xff)) << 32)+ (u64)pmcnt_low;
+		break;
+	}
+	edata->load_count = load_count;
+
+	/* Disable all counters */
+	ret = regmap_read(info->regmap, PPMU_V2_CNTENC, &cntenc);
+	if (ret < 0)
+		return 0;
+
+	cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
+	ret = regmap_write(info->regmap, PPMU_V2_CNTENC, cntenc);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(&edev->dev, "%25s (load: %ld / %ld)\n", edev->desc->name,
+					edata->load_count, edata->total_count);
+	return 0;
+}
+
+static const struct devfreq_event_ops exynos_ppmu_v2_ops = {
+	.disable = exynos_ppmu_v2_disable,
+	.set_event = exynos_ppmu_v2_set_event,
+	.get_event = exynos_ppmu_v2_get_event,
+};
+
+static const struct of_device_id exynos_ppmu_id_match[] = {
+	{
+		.compatible = "samsung,exynos-ppmu",
+		.data = (void *)EXYNOS_TYPE_PPMU,
+	}, {
+		.compatible = "samsung,exynos-ppmu-v2",
+		.data = (void *)EXYNOS_TYPE_PPMU_V2,
+	},
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, exynos_ppmu_id_match);
+
+static int of_get_devfreq_events(struct device_node *np,
+				 struct exynos_ppmu *info)
+{
+	struct devfreq_event_desc *desc;
+	struct device *dev = info->dev;
+	struct device_node *events_np, *node;
+	int i, j, count;
+	int ret;
+
+	events_np = of_get_child_by_name(np, "events");
+	if (!events_np) {
+		dev_err(dev,
+			"failed to get child node of devfreq-event devices\n");
+		return -EINVAL;
+	}
+
+	count = of_get_child_count(events_np);
+	desc = devm_kcalloc(dev, count, sizeof(*desc), GFP_KERNEL);
+	if (!desc) {
+		of_node_put(events_np);
+		return -ENOMEM;
+	}
+	info->num_events = count;
+
+	info->ppmu_type = (enum exynos_ppmu_type)device_get_match_data(dev);
+
+	j = 0;
+	for_each_child_of_node(events_np, node) {
+		for (i = 0; i < ARRAY_SIZE(ppmu_events); i++) {
+			if (!ppmu_events[i].name)
+				continue;
+
+			if (of_node_name_eq(node, ppmu_events[i].name))
+				break;
+		}
+
+		if (i == ARRAY_SIZE(ppmu_events)) {
+			dev_warn(dev,
+				"don't know how to configure events : %pOFn\n",
+				node);
+			continue;
+		}
+
+		switch (info->ppmu_type) {
+		case EXYNOS_TYPE_PPMU:
+			desc[j].ops = &exynos_ppmu_ops;
+			break;
+		case EXYNOS_TYPE_PPMU_V2:
+			desc[j].ops = &exynos_ppmu_v2_ops;
+			break;
+		}
+
+		desc[j].driver_data = info;
+
+		of_property_read_string(node, "event-name", &desc[j].name);
+		ret = of_property_read_u32(node, "event-data-type",
+					   &desc[j].event_type);
+		if (ret) {
+			/* Set the event of proper data type counting.
+			 * Check if the data type has been defined in DT,
+			 * use default if not.
+			 */
+			if (info->ppmu_type == EXYNOS_TYPE_PPMU_V2) {
+				/* Not all registers take the same value for
+				 * read+write data count.
+				 */
+				switch (ppmu_events[i].id) {
+				case PPMU_PMNCNT0:
+				case PPMU_PMNCNT1:
+				case PPMU_PMNCNT2:
+					desc[j].event_type = PPMU_V2_RO_DATA_CNT
+						| PPMU_V2_WO_DATA_CNT;
+					break;
+				case PPMU_PMNCNT3:
+					desc[j].event_type =
+						PPMU_V2_EVT3_RW_DATA_CNT;
+					break;
+				}
+			} else {
+				desc[j].event_type = PPMU_RO_DATA_CNT |
+					PPMU_WO_DATA_CNT;
+			}
+		}
+
+		j++;
+	}
+	info->desc = desc;
+
+	of_node_put(events_np);
+
+	return 0;
+}
+
+static struct regmap_config exynos_ppmu_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+static int exynos_ppmu_parse_dt(struct platform_device *pdev,
+				struct exynos_ppmu *info)
+{
+	struct device *dev = info->dev;
+	struct device_node *np = dev->of_node;
+	struct resource *res;
+	void __iomem *base;
+	int ret = 0;
+
+	if (!np) {
+		dev_err(dev, "failed to find devicetree node\n");
+		return -EINVAL;
+	}
+
+	/* Maps the memory mapped IO to control PPMU register */
+	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	exynos_ppmu_regmap_config.max_register = resource_size(res) - 4;
+	info->regmap = devm_regmap_init_mmio(dev, base,
+					&exynos_ppmu_regmap_config);
+	if (IS_ERR(info->regmap)) {
+		dev_err(dev, "failed to initialize regmap\n");
+		return PTR_ERR(info->regmap);
+	}
+
+	info->ppmu.clk = devm_clk_get(dev, "ppmu");
+	if (IS_ERR(info->ppmu.clk)) {
+		info->ppmu.clk = NULL;
+		dev_warn(dev, "cannot get PPMU clock\n");
+	}
+
+	ret = of_get_devfreq_events(np, info);
+	if (ret < 0) {
+		dev_err(dev, "failed to parse exynos ppmu dt node\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int exynos_ppmu_probe(struct platform_device *pdev)
+{
+	struct exynos_ppmu *info;
+	struct devfreq_event_dev **edev;
+	struct devfreq_event_desc *desc;
+	int i, ret = 0, size;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = &pdev->dev;
+
+	/* Parse dt data to get resource */
+	ret = exynos_ppmu_parse_dt(pdev, info);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"failed to parse devicetree for resource\n");
+		return ret;
+	}
+	desc = info->desc;
+
+	size = sizeof(struct devfreq_event_dev *) * info->num_events;
+	info->edev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+	if (!info->edev)
+		return -ENOMEM;
+
+	edev = info->edev;
+	platform_set_drvdata(pdev, info);
+
+	for (i = 0; i < info->num_events; i++) {
+		edev[i] = devm_devfreq_event_add_edev(&pdev->dev, &desc[i]);
+		if (IS_ERR(edev[i])) {
+			dev_err(&pdev->dev,
+				"failed to add devfreq-event device\n");
+			return PTR_ERR(edev[i]);
+		}
+
+		pr_info("exynos-ppmu: new PPMU device registered %s (%s)\n",
+			dev_name(&pdev->dev), desc[i].name);
+	}
+
+	ret = clk_prepare_enable(info->ppmu.clk);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to prepare ppmu clock\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void exynos_ppmu_remove(struct platform_device *pdev)
+{
+	struct exynos_ppmu *info = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(info->ppmu.clk);
+}
+
+static struct platform_driver exynos_ppmu_driver = {
+	.probe	= exynos_ppmu_probe,
+	.remove = exynos_ppmu_remove,
+	.driver = {
+		.name	= "exynos-ppmu",
+		.of_match_table = exynos_ppmu_id_match,
+	},
+};
+module_platform_driver(exynos_ppmu_driver);
+
+MODULE_DESCRIPTION("Exynos PPMU(Platform Performance Monitoring Unit) driver");
+MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
+MODULE_LICENSE("GPL");

linux-7.2.3/drivers/devfreq/event/exynos-ppmu.h

@@ -0,0 +1,160 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * exynos_ppmu.h - Exynos PPMU header file
+ *
+ * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ * Author : Chanwoo Choi <cw00.choi@samsung.com>
+ */
+
+#ifndef __EXYNOS_PPMU_H__
+#define __EXYNOS_PPMU_H__
+
+enum ppmu_state {
+	PPMU_DISABLE = 0,
+	PPMU_ENABLE,
+};
+
+enum ppmu_counter {
+	PPMU_PMNCNT0 = 0,
+	PPMU_PMNCNT1,
+	PPMU_PMNCNT2,
+	PPMU_PMNCNT3,
+
+	PPMU_PMNCNT_MAX,
+};
+
+/***
+ * PPMUv1.1 Definitions
+ */
+enum ppmu_event_type {
+	PPMU_RO_BUSY_CYCLE_CNT	= 0x0,
+	PPMU_WO_BUSY_CYCLE_CNT	= 0x1,
+	PPMU_RW_BUSY_CYCLE_CNT	= 0x2,
+	PPMU_RO_REQUEST_CNT	= 0x3,
+	PPMU_WO_REQUEST_CNT	= 0x4,
+	PPMU_RO_DATA_CNT	= 0x5,
+	PPMU_WO_DATA_CNT	= 0x6,
+	PPMU_RO_LATENCY		= 0x12,
+	PPMU_WO_LATENCY		= 0x16,
+};
+
+enum ppmu_reg {
+	/* PPC control register */
+	PPMU_PMNC		= 0x00,
+	PPMU_CNTENS		= 0x10,
+	PPMU_CNTENC		= 0x20,
+	PPMU_INTENS		= 0x30,
+	PPMU_INTENC		= 0x40,
+	PPMU_FLAG		= 0x50,
+
+	/* Cycle Counter and Performance Event Counter Register */
+	PPMU_CCNT		= 0x100,
+	PPMU_PMCNT0		= 0x110,
+	PPMU_PMCNT1		= 0x120,
+	PPMU_PMCNT2		= 0x130,
+	PPMU_PMCNT3_HIGH	= 0x140,
+	PPMU_PMCNT3_LOW		= 0x150,
+
+	/* Bus Event Generator */
+	PPMU_BEVT0SEL		= 0x1000,
+	PPMU_BEVT1SEL		= 0x1100,
+	PPMU_BEVT2SEL		= 0x1200,
+	PPMU_BEVT3SEL		= 0x1300,
+	PPMU_COUNTER_RESET	= 0x1810,
+	PPMU_READ_OVERFLOW_CNT	= 0x1810,
+	PPMU_READ_UNDERFLOW_CNT	= 0x1814,
+	PPMU_WRITE_OVERFLOW_CNT	= 0x1850,
+	PPMU_WRITE_UNDERFLOW_CNT = 0x1854,
+	PPMU_READ_PENDING_CNT	= 0x1880,
+	PPMU_WRITE_PENDING_CNT	= 0x1884
+};
+
+/* PMNC register */
+#define PPMU_PMNC_CC_RESET_SHIFT	2
+#define PPMU_PMNC_COUNTER_RESET_SHIFT	1
+#define PPMU_PMNC_ENABLE_SHIFT		0
+#define PPMU_PMNC_START_MODE_MASK	BIT(16)
+#define PPMU_PMNC_CC_DIVIDER_MASK	BIT(3)
+#define PPMU_PMNC_CC_RESET_MASK		BIT(2)
+#define PPMU_PMNC_COUNTER_RESET_MASK	BIT(1)
+#define PPMU_PMNC_ENABLE_MASK		BIT(0)
+
+/* CNTENS/CNTENC/INTENS/INTENC/FLAG register */
+#define PPMU_CCNT_MASK			BIT(31)
+#define PPMU_PMCNT3_MASK		BIT(3)
+#define PPMU_PMCNT2_MASK		BIT(2)
+#define PPMU_PMCNT1_MASK		BIT(1)
+#define PPMU_PMCNT0_MASK		BIT(0)
+
+/* PPMU_PMNCTx/PPMU_BETxSEL registers */
+#define PPMU_PMNCT(x)			(PPMU_PMCNT0 + (0x10 * x))
+#define PPMU_BEVTxSEL(x)		(PPMU_BEVT0SEL + (0x100 * x))
+
+/***
+ * PPMU_V2.0 definitions
+ */
+enum ppmu_v2_mode {
+	PPMU_V2_MODE_MANUAL = 0,
+	PPMU_V2_MODE_AUTO = 1,
+	PPMU_V2_MODE_CIG = 2,	/* CIG (Conditional Interrupt Generation) */
+};
+
+enum ppmu_v2_event_type {
+	PPMU_V2_RO_DATA_CNT	= 0x4,
+	PPMU_V2_WO_DATA_CNT	= 0x5,
+
+	PPMU_V2_EVT3_RW_DATA_CNT = 0x22,	/* Only for Event3 */
+};
+
+enum ppmu_V2_reg {
+	/* PPC control register */
+	PPMU_V2_PMNC		= 0x04,
+	PPMU_V2_CNTENS		= 0x08,
+	PPMU_V2_CNTENC		= 0x0c,
+	PPMU_V2_INTENS		= 0x10,
+	PPMU_V2_INTENC		= 0x14,
+	PPMU_V2_FLAG		= 0x18,
+
+	/* Cycle Counter and Performance Event Counter Register */
+	PPMU_V2_CCNT		= 0x48,
+	PPMU_V2_PMCNT0		= 0x34,
+	PPMU_V2_PMCNT1		= 0x38,
+	PPMU_V2_PMCNT2		= 0x3c,
+	PPMU_V2_PMCNT3_LOW	= 0x40,
+	PPMU_V2_PMCNT3_HIGH	= 0x44,
+
+	/* Bus Event Generator */
+	PPMU_V2_CIG_CFG0		= 0x1c,
+	PPMU_V2_CIG_CFG1		= 0x20,
+	PPMU_V2_CIG_CFG2		= 0x24,
+	PPMU_V2_CIG_RESULT	= 0x28,
+	PPMU_V2_CNT_RESET	= 0x2c,
+	PPMU_V2_CNT_AUTO		= 0x30,
+	PPMU_V2_CH_EV0_TYPE	= 0x200,
+	PPMU_V2_CH_EV1_TYPE	= 0x204,
+	PPMU_V2_CH_EV2_TYPE	= 0x208,
+	PPMU_V2_CH_EV3_TYPE	= 0x20c,
+	PPMU_V2_SM_ID_V		= 0x220,
+	PPMU_V2_SM_ID_A		= 0x224,
+	PPMU_V2_SM_OTHERS_V	= 0x228,
+	PPMU_V2_SM_OTHERS_A	= 0x22c,
+	PPMU_V2_INTERRUPT_RESET	= 0x260,
+};
+
+/* PMNC register */
+#define PPMU_V2_PMNC_START_MODE_SHIFT	20
+#define PPMU_V2_PMNC_START_MODE_MASK	(0x3 << PPMU_V2_PMNC_START_MODE_SHIFT)
+
+#define PPMU_PMNC_CC_RESET_SHIFT	2
+#define PPMU_PMNC_COUNTER_RESET_SHIFT	1
+#define PPMU_PMNC_ENABLE_SHIFT		0
+#define PPMU_PMNC_START_MODE_MASK	BIT(16)
+#define PPMU_PMNC_CC_DIVIDER_MASK	BIT(3)
+#define PPMU_PMNC_CC_RESET_MASK		BIT(2)
+#define PPMU_PMNC_COUNTER_RESET_MASK	BIT(1)
+#define PPMU_PMNC_ENABLE_MASK		BIT(0)
+
+#define PPMU_V2_PMNCT(x)		(PPMU_V2_PMCNT0 + (0x4 * x))
+#define PPMU_V2_CH_EVx_TYPE(x)		(PPMU_V2_CH_EV0_TYPE + (0x4 * x))
+
+#endif /* __EXYNOS_PPMU_H__ */

linux-7.2.3/drivers/devfreq/event/rockchip-dfi.c

@@ -0,0 +1,889 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
+ * Author: Lin Huang <hl@rock-chips.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/devfreq-event.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/seqlock.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/bitfield.h>
+#include <linux/hw_bitfield.h>
+#include <linux/bits.h>
+#include <linux/perf_event.h>
+
+#include <soc/rockchip/rockchip_grf.h>
+#include <soc/rockchip/rk3399_grf.h>
+#include <soc/rockchip/rk3568_grf.h>
+#include <soc/rockchip/rk3588_grf.h>
+
+#define DMC_MAX_CHANNELS	4
+
+/* DDRMON_CTRL */
+#define DDRMON_CTRL	0x04
+#define DDRMON_CTRL_LPDDR5		BIT(6)
+#define DDRMON_CTRL_DDR4		BIT(5)
+#define DDRMON_CTRL_LPDDR4		BIT(4)
+#define DDRMON_CTRL_HARDWARE_EN		BIT(3)
+#define DDRMON_CTRL_LPDDR23		BIT(2)
+#define DDRMON_CTRL_SOFTWARE_EN		BIT(1)
+#define DDRMON_CTRL_TIMER_CNT_EN	BIT(0)
+#define DDRMON_CTRL_LP5_BANK_MODE_MASK	GENMASK(8, 7)
+
+#define DDRMON_CH0_WR_NUM		0x20
+#define DDRMON_CH0_RD_NUM		0x24
+#define DDRMON_CH0_COUNT_NUM		0x28
+#define DDRMON_CH0_DFI_ACCESS_NUM	0x2c
+#define DDRMON_CH1_COUNT_NUM		0x3c
+#define DDRMON_CH1_DFI_ACCESS_NUM	0x40
+
+#define PERF_EVENT_CYCLES		0x0
+#define PERF_EVENT_READ_BYTES		0x1
+#define PERF_EVENT_WRITE_BYTES		0x2
+#define PERF_EVENT_READ_BYTES0		0x3
+#define PERF_EVENT_WRITE_BYTES0		0x4
+#define PERF_EVENT_READ_BYTES1		0x5
+#define PERF_EVENT_WRITE_BYTES1		0x6
+#define PERF_EVENT_READ_BYTES2		0x7
+#define PERF_EVENT_WRITE_BYTES2		0x8
+#define PERF_EVENT_READ_BYTES3		0x9
+#define PERF_EVENT_WRITE_BYTES3		0xa
+#define PERF_EVENT_BYTES		0xb
+#define PERF_ACCESS_TYPE_MAX		0xc
+
+/**
+ * struct dmc_count_channel - structure to hold counter values from the DDR controller
+ * @access:       Number of read and write accesses
+ * @clock_cycles: DDR clock cycles
+ * @read_access:  number of read accesses
+ * @write_access: number of write accesses
+ */
+struct dmc_count_channel {
+	u64 access;
+	u64 clock_cycles;
+	u64 read_access;
+	u64 write_access;
+};
+
+struct dmc_count {
+	struct dmc_count_channel c[DMC_MAX_CHANNELS];
+};
+
+/*
+ * The dfi controller can monitor DDR load. It has an upper and lower threshold
+ * for the operating points. Whenever the usage leaves these bounds an event is
+ * generated to indicate the DDR frequency should be changed.
+ */
+struct rockchip_dfi {
+	struct devfreq_event_dev *edev;
+	struct devfreq_event_desc desc;
+	struct dmc_count last_event_count;
+
+	struct dmc_count last_perf_count;
+	struct dmc_count total_count;
+	seqlock_t count_seqlock; /* protects last_perf_count and total_count */
+
+	struct device *dev;
+	void __iomem *regs;
+	struct regmap *regmap_pmu;
+	struct clk *clk;
+	int usecount;
+	struct mutex mutex;
+	u32 ddr_type;
+	unsigned int channel_mask;
+	unsigned int max_channels;
+	enum cpuhp_state cpuhp_state;
+	struct hlist_node node;
+	struct pmu pmu;
+	struct hrtimer timer;
+	unsigned int cpu;
+	int active_events;
+	int burst_len;
+	int buswidth[DMC_MAX_CHANNELS];
+	int ddrmon_stride;
+	bool ddrmon_ctrl_single;
+	u32 lp5_bank_mode;
+	bool lp5_ckr;	/* true if in 4:1 command-to-data clock ratio mode */
+	unsigned int count_multiplier;	/* number of data clocks per count */
+};
+
+static int rockchip_dfi_ddrtype_to_ctrl(struct rockchip_dfi *dfi, u32 *ctrl)
+{
+	u32 ddrmon_ver;
+
+	switch (dfi->ddr_type) {
+	case ROCKCHIP_DDRTYPE_LPDDR2:
+	case ROCKCHIP_DDRTYPE_LPDDR3:
+		*ctrl = FIELD_PREP_WM16(DDRMON_CTRL_LPDDR23, 1) |
+			FIELD_PREP_WM16(DDRMON_CTRL_LPDDR4, 0) |
+			FIELD_PREP_WM16(DDRMON_CTRL_LPDDR5, 0);
+		break;
+	case ROCKCHIP_DDRTYPE_LPDDR4:
+	case ROCKCHIP_DDRTYPE_LPDDR4X:
+		*ctrl = FIELD_PREP_WM16(DDRMON_CTRL_LPDDR23, 0) |
+			FIELD_PREP_WM16(DDRMON_CTRL_LPDDR4, 1) |
+			FIELD_PREP_WM16(DDRMON_CTRL_LPDDR5, 0);
+		break;
+	case ROCKCHIP_DDRTYPE_LPDDR5:
+		ddrmon_ver = readl_relaxed(dfi->regs);
+		if (ddrmon_ver < 0x40) {
+			*ctrl = FIELD_PREP_WM16(DDRMON_CTRL_LPDDR23, 0) |
+				FIELD_PREP_WM16(DDRMON_CTRL_LPDDR4, 0) |
+				FIELD_PREP_WM16(DDRMON_CTRL_LPDDR5, 1) |
+				FIELD_PREP_WM16(DDRMON_CTRL_LP5_BANK_MODE_MASK,
+						dfi->lp5_bank_mode);
+			break;
+		}
+
+		/*
+		 * As it is unknown whether the unpleasant special case
+		 * behaviour used by the vendor kernel is needed for any
+		 * shipping hardware, ask users to report if they have
+		 * some of that hardware.
+		 */
+		dev_err(&dfi->edev->dev,
+			"unsupported DDRMON version 0x%04X, please let linux-rockchip know!\n",
+			ddrmon_ver);
+		return -EOPNOTSUPP;
+	default:
+		dev_err(&dfi->edev->dev, "unsupported memory type 0x%X\n",
+			dfi->ddr_type);
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int rockchip_dfi_enable(struct rockchip_dfi *dfi)
+{
+	void __iomem *dfi_regs = dfi->regs;
+	int i, ret = 0;
+	u32 ctrl;
+
+	mutex_lock(&dfi->mutex);
+
+	dfi->usecount++;
+	if (dfi->usecount > 1)
+		goto out;
+
+	ret = clk_prepare_enable(dfi->clk);
+	if (ret) {
+		dev_err(&dfi->edev->dev, "failed to enable dfi clk: %d\n", ret);
+		goto out;
+	}
+
+	ret = rockchip_dfi_ddrtype_to_ctrl(dfi, &ctrl);
+	if (ret)
+		goto out;
+
+	for (i = 0; i < dfi->max_channels; i++) {
+
+		if (!(dfi->channel_mask & BIT(i)))
+			continue;
+
+		/* clear DDRMON_CTRL setting */
+		writel_relaxed(FIELD_PREP_WM16(DDRMON_CTRL_TIMER_CNT_EN, 0) |
+			       FIELD_PREP_WM16(DDRMON_CTRL_SOFTWARE_EN, 0) |
+			       FIELD_PREP_WM16(DDRMON_CTRL_HARDWARE_EN, 0),
+			       dfi_regs + i * dfi->ddrmon_stride + DDRMON_CTRL);
+
+		writel_relaxed(ctrl, dfi_regs + i * dfi->ddrmon_stride +
+			       DDRMON_CTRL);
+
+		/* enable count, use software mode */
+		writel_relaxed(FIELD_PREP_WM16(DDRMON_CTRL_SOFTWARE_EN, 1),
+			       dfi_regs + i * dfi->ddrmon_stride + DDRMON_CTRL);
+
+		if (dfi->ddrmon_ctrl_single)
+			break;
+	}
+out:
+	mutex_unlock(&dfi->mutex);
+
+	return ret;
+}
+
+static void rockchip_dfi_disable(struct rockchip_dfi *dfi)
+{
+	void __iomem *dfi_regs = dfi->regs;
+	int i;
+
+	mutex_lock(&dfi->mutex);
+
+	dfi->usecount--;
+
+	WARN_ON_ONCE(dfi->usecount < 0);
+
+	if (dfi->usecount > 0)
+		goto out;
+
+	for (i = 0; i < dfi->max_channels; i++) {
+		if (!(dfi->channel_mask & BIT(i)))
+			continue;
+
+		writel_relaxed(FIELD_PREP_WM16(DDRMON_CTRL_SOFTWARE_EN, 0),
+			       dfi_regs + i * dfi->ddrmon_stride + DDRMON_CTRL);
+
+		if (dfi->ddrmon_ctrl_single)
+			break;
+	}
+
+	clk_disable_unprepare(dfi->clk);
+out:
+	mutex_unlock(&dfi->mutex);
+}
+
+static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dmc_count *res)
+{
+	u32 i;
+	void __iomem *dfi_regs = dfi->regs;
+
+	for (i = 0; i < dfi->max_channels; i++) {
+		if (!(dfi->channel_mask & BIT(i)))
+			continue;
+		res->c[i].read_access = readl_relaxed(dfi_regs +
+				DDRMON_CH0_RD_NUM + i * dfi->ddrmon_stride);
+		res->c[i].write_access = readl_relaxed(dfi_regs +
+				DDRMON_CH0_WR_NUM + i * dfi->ddrmon_stride);
+		res->c[i].access = readl_relaxed(dfi_regs +
+				DDRMON_CH0_DFI_ACCESS_NUM + i * dfi->ddrmon_stride);
+		res->c[i].clock_cycles = readl_relaxed(dfi_regs +
+				DDRMON_CH0_COUNT_NUM + i * dfi->ddrmon_stride);
+	}
+}
+
+static int rockchip_dfi_event_disable(struct devfreq_event_dev *edev)
+{
+	struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev);
+
+	rockchip_dfi_disable(dfi);
+
+	return 0;
+}
+
+static int rockchip_dfi_event_enable(struct devfreq_event_dev *edev)
+{
+	struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev);
+
+	return rockchip_dfi_enable(dfi);
+}
+
+static int rockchip_dfi_set_event(struct devfreq_event_dev *edev)
+{
+	return 0;
+}
+
+static int rockchip_dfi_get_event(struct devfreq_event_dev *edev,
+				  struct devfreq_event_data *edata)
+{
+	struct rockchip_dfi *dfi = devfreq_event_get_drvdata(edev);
+	struct dmc_count count;
+	struct dmc_count *last = &dfi->last_event_count;
+	u32 access = 0, clock_cycles = 0;
+	int i;
+
+	rockchip_dfi_read_counters(dfi, &count);
+
+	/* We can only report one channel, so find the busiest one */
+	for (i = 0; i < dfi->max_channels; i++) {
+		u32 a, c;
+
+		if (!(dfi->channel_mask & BIT(i)))
+			continue;
+
+		a = count.c[i].access - last->c[i].access;
+		c = count.c[i].clock_cycles - last->c[i].clock_cycles;
+
+		if (a > access) {
+			access = a;
+			clock_cycles = c;
+		}
+	}
+
+	edata->load_count = access * 4;
+	edata->total_count = clock_cycles;
+
+	dfi->last_event_count = count;
+
+	return 0;
+}
+
+static const struct devfreq_event_ops rockchip_dfi_ops = {
+	.disable = rockchip_dfi_event_disable,
+	.enable = rockchip_dfi_event_enable,
+	.get_event = rockchip_dfi_get_event,
+	.set_event = rockchip_dfi_set_event,
+};
+
+#ifdef CONFIG_PERF_EVENTS
+
+static void rockchip_ddr_perf_counters_add(struct rockchip_dfi *dfi,
+					   const struct dmc_count *now,
+					   struct dmc_count *res)
+{
+	const struct dmc_count *last = &dfi->last_perf_count;
+	int i;
+
+	for (i = 0; i < dfi->max_channels; i++) {
+		res->c[i].read_access = dfi->total_count.c[i].read_access +
+			(u32)(now->c[i].read_access - last->c[i].read_access);
+		res->c[i].write_access = dfi->total_count.c[i].write_access +
+			(u32)(now->c[i].write_access - last->c[i].write_access);
+		res->c[i].access = dfi->total_count.c[i].access +
+			(u32)(now->c[i].access - last->c[i].access);
+		res->c[i].clock_cycles = dfi->total_count.c[i].clock_cycles +
+			(u32)(now->c[i].clock_cycles - last->c[i].clock_cycles);
+	}
+}
+
+static ssize_t ddr_perf_cpumask_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct pmu *pmu = dev_get_drvdata(dev);
+	struct rockchip_dfi *dfi = container_of(pmu, struct rockchip_dfi, pmu);
+
+	return cpumap_print_to_pagebuf(true, buf, cpumask_of(dfi->cpu));
+}
+
+static struct device_attribute ddr_perf_cpumask_attr =
+	__ATTR(cpumask, 0444, ddr_perf_cpumask_show, NULL);
+
+static struct attribute *ddr_perf_cpumask_attrs[] = {
+	&ddr_perf_cpumask_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ddr_perf_cpumask_attr_group = {
+	.attrs = ddr_perf_cpumask_attrs,
+};
+
+PMU_EVENT_ATTR_STRING(cycles, ddr_pmu_cycles, "event="__stringify(PERF_EVENT_CYCLES))
+
+#define DFI_PMU_EVENT_ATTR(_name, _var, _str) \
+	PMU_EVENT_ATTR_STRING(_name, _var, _str); \
+	PMU_EVENT_ATTR_STRING(_name.unit, _var##_unit, "MB"); \
+	PMU_EVENT_ATTR_STRING(_name.scale, _var##_scale, "9.536743164e-07")
+
+DFI_PMU_EVENT_ATTR(read-bytes0, ddr_pmu_read_bytes0, "event="__stringify(PERF_EVENT_READ_BYTES0));
+DFI_PMU_EVENT_ATTR(write-bytes0, ddr_pmu_write_bytes0, "event="__stringify(PERF_EVENT_WRITE_BYTES0));
+
+DFI_PMU_EVENT_ATTR(read-bytes1, ddr_pmu_read_bytes1, "event="__stringify(PERF_EVENT_READ_BYTES1));
+DFI_PMU_EVENT_ATTR(write-bytes1, ddr_pmu_write_bytes1, "event="__stringify(PERF_EVENT_WRITE_BYTES1));
+
+DFI_PMU_EVENT_ATTR(read-bytes2, ddr_pmu_read_bytes2, "event="__stringify(PERF_EVENT_READ_BYTES2));
+DFI_PMU_EVENT_ATTR(write-bytes2, ddr_pmu_write_bytes2, "event="__stringify(PERF_EVENT_WRITE_BYTES2));
+
+DFI_PMU_EVENT_ATTR(read-bytes3, ddr_pmu_read_bytes3, "event="__stringify(PERF_EVENT_READ_BYTES3));
+DFI_PMU_EVENT_ATTR(write-bytes3, ddr_pmu_write_bytes3, "event="__stringify(PERF_EVENT_WRITE_BYTES3));
+
+DFI_PMU_EVENT_ATTR(read-bytes, ddr_pmu_read_bytes, "event="__stringify(PERF_EVENT_READ_BYTES));
+DFI_PMU_EVENT_ATTR(write-bytes, ddr_pmu_write_bytes, "event="__stringify(PERF_EVENT_WRITE_BYTES));
+
+DFI_PMU_EVENT_ATTR(bytes, ddr_pmu_bytes, "event="__stringify(PERF_EVENT_BYTES));
+
+#define DFI_ATTR_MB(_name) 		\
+	&_name.attr.attr,		\
+	&_name##_unit.attr.attr,	\
+	&_name##_scale.attr.attr
+
+static struct attribute *ddr_perf_events_attrs[] = {
+	&ddr_pmu_cycles.attr.attr,
+	DFI_ATTR_MB(ddr_pmu_read_bytes),
+	DFI_ATTR_MB(ddr_pmu_write_bytes),
+	DFI_ATTR_MB(ddr_pmu_read_bytes0),
+	DFI_ATTR_MB(ddr_pmu_write_bytes0),
+	DFI_ATTR_MB(ddr_pmu_read_bytes1),
+	DFI_ATTR_MB(ddr_pmu_write_bytes1),
+	DFI_ATTR_MB(ddr_pmu_read_bytes2),
+	DFI_ATTR_MB(ddr_pmu_write_bytes2),
+	DFI_ATTR_MB(ddr_pmu_read_bytes3),
+	DFI_ATTR_MB(ddr_pmu_write_bytes3),
+	DFI_ATTR_MB(ddr_pmu_bytes),
+	NULL,
+};
+
+static const struct attribute_group ddr_perf_events_attr_group = {
+	.name = "events",
+	.attrs = ddr_perf_events_attrs,
+};
+
+PMU_FORMAT_ATTR(event, "config:0-7");
+
+static struct attribute *ddr_perf_format_attrs[] = {
+	&format_attr_event.attr,
+	NULL,
+};
+
+static const struct attribute_group ddr_perf_format_attr_group = {
+	.name = "format",
+	.attrs = ddr_perf_format_attrs,
+};
+
+static const struct attribute_group *attr_groups[] = {
+	&ddr_perf_events_attr_group,
+	&ddr_perf_cpumask_attr_group,
+	&ddr_perf_format_attr_group,
+	NULL,
+};
+
+static int rockchip_ddr_perf_event_init(struct perf_event *event)
+{
+	struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu);
+
+	if (event->attr.type != event->pmu->type)
+		return -ENOENT;
+
+	if (event->attach_state & PERF_ATTACH_TASK)
+		return -EINVAL;
+
+	if (event->cpu < 0) {
+		dev_warn(dfi->dev, "Can't provide per-task data!\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static u64 rockchip_ddr_perf_event_get_count(struct perf_event *event)
+{
+	struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu);
+	int blen = dfi->burst_len;
+	struct dmc_count total, now;
+	unsigned int seq;
+	u64 count = 0;
+	int i;
+
+	rockchip_dfi_read_counters(dfi, &now);
+
+	do {
+		seq = read_seqbegin(&dfi->count_seqlock);
+		rockchip_ddr_perf_counters_add(dfi, &now, &total);
+	} while (read_seqretry(&dfi->count_seqlock, seq));
+
+	switch (event->attr.config) {
+	case PERF_EVENT_CYCLES:
+		count = total.c[0].clock_cycles * dfi->count_multiplier;
+		break;
+	case PERF_EVENT_READ_BYTES:
+		for (i = 0; i < dfi->max_channels; i++)
+			count += total.c[i].read_access * blen * dfi->buswidth[i];
+		break;
+	case PERF_EVENT_WRITE_BYTES:
+		for (i = 0; i < dfi->max_channels; i++)
+			count += total.c[i].write_access * blen * dfi->buswidth[i];
+		break;
+	case PERF_EVENT_READ_BYTES0:
+		count = total.c[0].read_access * blen * dfi->buswidth[0];
+		break;
+	case PERF_EVENT_WRITE_BYTES0:
+		count = total.c[0].write_access * blen * dfi->buswidth[0];
+		break;
+	case PERF_EVENT_READ_BYTES1:
+		count = total.c[1].read_access * blen * dfi->buswidth[1];
+		break;
+	case PERF_EVENT_WRITE_BYTES1:
+		count = total.c[1].write_access * blen * dfi->buswidth[1];
+		break;
+	case PERF_EVENT_READ_BYTES2:
+		count = total.c[2].read_access * blen * dfi->buswidth[2];
+		break;
+	case PERF_EVENT_WRITE_BYTES2:
+		count = total.c[2].write_access * blen * dfi->buswidth[2];
+		break;
+	case PERF_EVENT_READ_BYTES3:
+		count = total.c[3].read_access * blen * dfi->buswidth[3];
+		break;
+	case PERF_EVENT_WRITE_BYTES3:
+		count = total.c[3].write_access * blen * dfi->buswidth[3];
+		break;
+	case PERF_EVENT_BYTES:
+		for (i = 0; i < dfi->max_channels; i++)
+			count += total.c[i].access * blen * dfi->buswidth[i];
+		break;
+	}
+
+	return count;
+}
+
+static void rockchip_ddr_perf_event_update(struct perf_event *event)
+{
+	u64 now;
+	s64 prev;
+
+	if (event->attr.config >= PERF_ACCESS_TYPE_MAX)
+		return;
+
+	now = rockchip_ddr_perf_event_get_count(event);
+	prev = local64_xchg(&event->hw.prev_count, now);
+	local64_add(now - prev, &event->count);
+}
+
+static void rockchip_ddr_perf_event_start(struct perf_event *event, int flags)
+{
+	u64 now = rockchip_ddr_perf_event_get_count(event);
+
+	local64_set(&event->hw.prev_count, now);
+}
+
+static int rockchip_ddr_perf_event_add(struct perf_event *event, int flags)
+{
+	struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu);
+
+	dfi->active_events++;
+
+	if (dfi->active_events == 1) {
+		dfi->total_count = (struct dmc_count){};
+		rockchip_dfi_read_counters(dfi, &dfi->last_perf_count);
+		hrtimer_start(&dfi->timer, ns_to_ktime(NSEC_PER_SEC), HRTIMER_MODE_REL);
+	}
+
+	if (flags & PERF_EF_START)
+		rockchip_ddr_perf_event_start(event, flags);
+
+	return 0;
+}
+
+static void rockchip_ddr_perf_event_stop(struct perf_event *event, int flags)
+{
+	rockchip_ddr_perf_event_update(event);
+}
+
+static void rockchip_ddr_perf_event_del(struct perf_event *event, int flags)
+{
+	struct rockchip_dfi *dfi = container_of(event->pmu, struct rockchip_dfi, pmu);
+
+	rockchip_ddr_perf_event_stop(event, PERF_EF_UPDATE);
+
+	dfi->active_events--;
+
+	if (dfi->active_events == 0)
+		hrtimer_cancel(&dfi->timer);
+}
+
+static enum hrtimer_restart rockchip_dfi_timer(struct hrtimer *timer)
+{
+	struct rockchip_dfi *dfi = container_of(timer, struct rockchip_dfi, timer);
+	struct dmc_count now, total;
+
+	rockchip_dfi_read_counters(dfi, &now);
+
+	write_seqlock(&dfi->count_seqlock);
+
+	rockchip_ddr_perf_counters_add(dfi, &now, &total);
+	dfi->total_count = total;
+	dfi->last_perf_count = now;
+
+	write_sequnlock(&dfi->count_seqlock);
+
+	hrtimer_forward_now(&dfi->timer, ns_to_ktime(NSEC_PER_SEC));
+
+	return HRTIMER_RESTART;
+};
+
+static int ddr_perf_offline_cpu(unsigned int cpu, struct hlist_node *node)
+{
+	struct rockchip_dfi *dfi = hlist_entry_safe(node, struct rockchip_dfi, node);
+	int target;
+
+	if (cpu != dfi->cpu)
+		return 0;
+
+	target = cpumask_any_but(cpu_online_mask, cpu);
+	if (target >= nr_cpu_ids)
+		return 0;
+
+	perf_pmu_migrate_context(&dfi->pmu, cpu, target);
+	dfi->cpu = target;
+
+	return 0;
+}
+
+static void rockchip_ddr_cpuhp_remove_state(void *data)
+{
+	struct rockchip_dfi *dfi = data;
+
+	cpuhp_remove_multi_state(dfi->cpuhp_state);
+
+	rockchip_dfi_disable(dfi);
+}
+
+static void rockchip_ddr_cpuhp_remove_instance(void *data)
+{
+	struct rockchip_dfi *dfi = data;
+
+	cpuhp_state_remove_instance_nocalls(dfi->cpuhp_state, &dfi->node);
+}
+
+static void rockchip_ddr_perf_remove(void *data)
+{
+	struct rockchip_dfi *dfi = data;
+
+	perf_pmu_unregister(&dfi->pmu);
+}
+
+static int rockchip_ddr_perf_init(struct rockchip_dfi *dfi)
+{
+	struct pmu *pmu = &dfi->pmu;
+	int ret;
+
+	seqlock_init(&dfi->count_seqlock);
+
+	pmu->module = THIS_MODULE;
+	pmu->capabilities = PERF_PMU_CAP_NO_EXCLUDE;
+	pmu->task_ctx_nr = perf_invalid_context;
+	pmu->attr_groups = attr_groups;
+	pmu->event_init  = rockchip_ddr_perf_event_init;
+	pmu->add = rockchip_ddr_perf_event_add;
+	pmu->del = rockchip_ddr_perf_event_del;
+	pmu->start = rockchip_ddr_perf_event_start;
+	pmu->stop = rockchip_ddr_perf_event_stop;
+	pmu->read = rockchip_ddr_perf_event_update;
+
+	dfi->cpu = raw_smp_processor_id();
+
+	ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
+				      "rockchip_ddr_perf_pmu",
+				      NULL,
+				      ddr_perf_offline_cpu);
+
+	if (ret < 0) {
+		dev_err(dfi->dev, "cpuhp_setup_state_multi failed: %d\n", ret);
+		return ret;
+	}
+
+	dfi->cpuhp_state = ret;
+
+	rockchip_dfi_enable(dfi);
+
+	ret = devm_add_action_or_reset(dfi->dev, rockchip_ddr_cpuhp_remove_state, dfi);
+	if (ret)
+		return ret;
+
+	ret = cpuhp_state_add_instance_nocalls(dfi->cpuhp_state, &dfi->node);
+	if (ret) {
+		dev_err(dfi->dev, "Error %d registering hotplug\n", ret);
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(dfi->dev, rockchip_ddr_cpuhp_remove_instance, dfi);
+	if (ret)
+		return ret;
+
+	hrtimer_setup(&dfi->timer, rockchip_dfi_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+
+	switch (dfi->ddr_type) {
+	case ROCKCHIP_DDRTYPE_LPDDR2:
+	case ROCKCHIP_DDRTYPE_LPDDR3:
+		dfi->burst_len = 8;
+		break;
+	case ROCKCHIP_DDRTYPE_LPDDR4:
+	case ROCKCHIP_DDRTYPE_LPDDR4X:
+	case ROCKCHIP_DDRTYPE_LPDDR5:
+		dfi->burst_len = 16;
+		break;
+	}
+
+	if (!dfi->count_multiplier)
+		dfi->count_multiplier = 1;
+
+	ret = perf_pmu_register(pmu, "rockchip_ddr", -1);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dfi->dev, rockchip_ddr_perf_remove, dfi);
+}
+#else
+static int rockchip_ddr_perf_init(struct rockchip_dfi *dfi)
+{
+	return 0;
+}
+#endif
+
+static int rk3399_dfi_init(struct rockchip_dfi *dfi)
+{
+	struct regmap *regmap_pmu = dfi->regmap_pmu;
+	u32 val;
+
+	dfi->clk = devm_clk_get(dfi->dev, "pclk_ddr_mon");
+	if (IS_ERR(dfi->clk))
+		return dev_err_probe(dfi->dev, PTR_ERR(dfi->clk),
+				     "Cannot get the clk pclk_ddr_mon\n");
+
+	/* get ddr type */
+	regmap_read(regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
+	dfi->ddr_type = FIELD_GET(RK3399_PMUGRF_OS_REG2_DDRTYPE, val);
+
+	dfi->channel_mask = GENMASK(1, 0);
+	dfi->max_channels = 2;
+
+	dfi->buswidth[0] = FIELD_GET(RK3399_PMUGRF_OS_REG2_BW_CH0, val) == 0 ? 4 : 2;
+	dfi->buswidth[1] = FIELD_GET(RK3399_PMUGRF_OS_REG2_BW_CH1, val) == 0 ? 4 : 2;
+
+	dfi->ddrmon_stride = 0x14;
+	dfi->ddrmon_ctrl_single = true;
+
+	return 0;
+};
+
+static int rk3568_dfi_init(struct rockchip_dfi *dfi)
+{
+	struct regmap *regmap_pmu = dfi->regmap_pmu;
+	u32 reg2, reg3;
+
+	regmap_read(regmap_pmu, RK3568_PMUGRF_OS_REG2, &reg2);
+	regmap_read(regmap_pmu, RK3568_PMUGRF_OS_REG3, &reg3);
+
+	/* lower 3 bits of the DDR type */
+	dfi->ddr_type = FIELD_GET(RK3568_PMUGRF_OS_REG2_DRAMTYPE_INFO, reg2);
+
+	/*
+	 * For version three and higher the upper two bits of the DDR type are
+	 * in RK3568_PMUGRF_OS_REG3
+	 */
+	if (FIELD_GET(RK3568_PMUGRF_OS_REG3_SYSREG_VERSION, reg3) >= 0x3)
+		dfi->ddr_type |= FIELD_GET(RK3568_PMUGRF_OS_REG3_DRAMTYPE_INFO_V3, reg3) << 3;
+
+	dfi->channel_mask = BIT(0);
+	dfi->max_channels = 1;
+
+	dfi->buswidth[0] = FIELD_GET(RK3568_PMUGRF_OS_REG2_BW_CH0, reg2) == 0 ? 4 : 2;
+
+	dfi->ddrmon_stride = 0x0; /* not relevant, we only have a single channel on this SoC */
+	dfi->ddrmon_ctrl_single = true;
+
+	return 0;
+};
+
+static int rk3588_dfi_init(struct rockchip_dfi *dfi)
+{
+	struct regmap *regmap_pmu = dfi->regmap_pmu;
+	u32 reg2, reg3, reg4, reg6;
+
+	regmap_read(regmap_pmu, RK3588_PMUGRF_OS_REG2, &reg2);
+	regmap_read(regmap_pmu, RK3588_PMUGRF_OS_REG3, &reg3);
+	regmap_read(regmap_pmu, RK3588_PMUGRF_OS_REG4, &reg4);
+
+	/* lower 3 bits of the DDR type */
+	dfi->ddr_type = FIELD_GET(RK3588_PMUGRF_OS_REG2_DRAMTYPE_INFO, reg2);
+
+	/*
+	 * For version three and higher the upper two bits of the DDR type are
+	 * in RK3588_PMUGRF_OS_REG3
+	 */
+	if (FIELD_GET(RK3588_PMUGRF_OS_REG3_SYSREG_VERSION, reg3) >= 0x3)
+		dfi->ddr_type |= FIELD_GET(RK3588_PMUGRF_OS_REG3_DRAMTYPE_INFO_V3, reg3) << 3;
+
+	dfi->buswidth[0] = FIELD_GET(RK3588_PMUGRF_OS_REG2_BW_CH0, reg2) == 0 ? 4 : 2;
+	dfi->buswidth[1] = FIELD_GET(RK3588_PMUGRF_OS_REG2_BW_CH1, reg2) == 0 ? 4 : 2;
+	dfi->buswidth[2] = FIELD_GET(RK3568_PMUGRF_OS_REG2_BW_CH0, reg4) == 0 ? 4 : 2;
+	dfi->buswidth[3] = FIELD_GET(RK3588_PMUGRF_OS_REG2_BW_CH1, reg4) == 0 ? 4 : 2;
+	dfi->channel_mask = FIELD_GET(RK3588_PMUGRF_OS_REG2_CH_INFO, reg2) |
+			    FIELD_GET(RK3588_PMUGRF_OS_REG2_CH_INFO, reg4) << 2;
+	dfi->max_channels = 4;
+
+	dfi->ddrmon_stride = 0x4000;
+	dfi->count_multiplier = 2;
+
+	if (dfi->ddr_type == ROCKCHIP_DDRTYPE_LPDDR5) {
+		regmap_read(regmap_pmu, RK3588_PMUGRF_OS_REG6, &reg6);
+		dfi->lp5_bank_mode = FIELD_GET(RK3588_PMUGRF_OS_REG6_LP5_BANK_MODE, reg6) << 7;
+		dfi->lp5_ckr = FIELD_GET(RK3588_PMUGRF_OS_REG6_LP5_CKR, reg6);
+		if (dfi->lp5_ckr)
+			dfi->count_multiplier *= 2;
+	}
+
+	return 0;
+};
+
+static const struct of_device_id rockchip_dfi_id_match[] = {
+	{ .compatible = "rockchip,rk3399-dfi", .data = rk3399_dfi_init },
+	{ .compatible = "rockchip,rk3568-dfi", .data = rk3568_dfi_init },
+	{ .compatible = "rockchip,rk3588-dfi", .data = rk3588_dfi_init },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(of, rockchip_dfi_id_match);
+
+static int rockchip_dfi_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct rockchip_dfi *dfi;
+	struct devfreq_event_desc *desc;
+	struct device_node *np = pdev->dev.of_node, *node;
+	int (*soc_init)(struct rockchip_dfi *dfi);
+	int ret;
+
+	soc_init = of_device_get_match_data(&pdev->dev);
+	if (!soc_init)
+		return -EINVAL;
+
+	dfi = devm_kzalloc(dev, sizeof(*dfi), GFP_KERNEL);
+	if (!dfi)
+		return -ENOMEM;
+
+	dfi->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(dfi->regs))
+		return PTR_ERR(dfi->regs);
+
+	node = of_parse_phandle(np, "rockchip,pmu", 0);
+	if (!node)
+		return dev_err_probe(&pdev->dev, -ENODEV, "Can't find pmu_grf registers\n");
+
+	dfi->regmap_pmu = syscon_node_to_regmap(node);
+	of_node_put(node);
+	if (IS_ERR(dfi->regmap_pmu))
+		return PTR_ERR(dfi->regmap_pmu);
+
+	dfi->dev = dev;
+	mutex_init(&dfi->mutex);
+
+	desc = &dfi->desc;
+	desc->ops = &rockchip_dfi_ops;
+	desc->driver_data = dfi;
+	desc->name = np->name;
+
+	ret = soc_init(dfi);
+	if (ret)
+		return ret;
+
+	dfi->edev = devm_devfreq_event_add_edev(&pdev->dev, desc);
+	if (IS_ERR(dfi->edev)) {
+		dev_err(&pdev->dev,
+			"failed to add devfreq-event device\n");
+		return PTR_ERR(dfi->edev);
+	}
+
+	ret = rockchip_ddr_perf_init(dfi);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, dfi);
+
+	return 0;
+}
+
+static struct platform_driver rockchip_dfi_driver = {
+	.probe	= rockchip_dfi_probe,
+	.driver = {
+		.name	= "rockchip-dfi",
+		.of_match_table = rockchip_dfi_id_match,
+		.suppress_bind_attrs = true,
+	},
+};
+module_platform_driver(rockchip_dfi_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip DFI driver");