build/patch/kernel/archive/rk322x-5.15/03-0003-extend-rockchip-dfi-driver.patch

From 415ed43c9b64ca38bc433bd5dc0359292dd80380 Mon Sep 17 00:00:00 2001
From: Paolo Sabatino <paolo.sabatino@gmail.com>
Date: Tue, 6 Jul 2021 14:25:41 +0000
Subject: [PATCH 3/5] rk3228/rk3328: extend rockchip dfi driver

---
 arch/arm/boot/dts/rk322x.dtsi        |   7 +
 drivers/devfreq/event/rockchip-dfi.c | 598 ++++++++++++++++++++++++---
 2 files changed, 557 insertions(+), 48 deletions(-)

diff --git a/arch/arm/boot/dts/rk322x.dtsi b/arch/arm/boot/dts/rk322x.dtsi
index ad98fcf37..7e06acc31 100644
--- a/arch/arm/boot/dts/rk322x.dtsi
+++ b/arch/arm/boot/dts/rk322x.dtsi
@@ -97,6 +97,13 @@ opp-1200000000 {
 		};
 	};
 
+	dfi: dfi@11210000 {
+		reg = <0x11210000 0x400>;
+		compatible = "rockchip,rk3228-dfi";
+		rockchip,grf = <&grf>;
+		status = "okay";
+	};
+
 	arm-pmu {
 		compatible = "arm,cortex-a7-pmu";
 		interrupts = <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c
index 9a88faaf8..01fb84b99 100644
--- a/drivers/devfreq/event/rockchip-dfi.c
+++ b/drivers/devfreq/event/rockchip-dfi.c
@@ -18,25 +18,68 @@
 #include <linux/list.h>
 #include <linux/of.h>
 
-#include <soc/rockchip/rk3399_grf.h>
-
-#define RK3399_DMC_NUM_CH	2
-
+#define PX30_PMUGRF_OS_REG2		0x208
+
+#define RK3128_GRF_SOC_CON0		0x140
+#define RK3128_GRF_OS_REG1		0x1cc
+#define RK3128_GRF_DFI_WRNUM		0x220
+#define RK3128_GRF_DFI_RDNUM		0x224
+#define RK3128_GRF_DFI_TIMERVAL		0x22c
+#define RK3128_DDR_MONITOR_EN		((1 << (16 + 6)) + (1 << 6))
+#define RK3128_DDR_MONITOR_DISB		((1 << (16 + 6)) + (0 << 6))
+
+#define RK3228_GRF_OS_REG2		0x5d0
+
+#define RK3288_PMU_SYS_REG2		0x9c
+#define RK3288_GRF_SOC_CON4		0x254
+#define RK3288_GRF_SOC_STATUS(n)	(0x280 + (n) * 4)
+#define RK3288_DFI_EN			(0x30003 << 14)
+#define RK3288_DFI_DIS			(0x30000 << 14)
+#define RK3288_LPDDR_SEL		(0x10001 << 13)
+#define RK3288_DDR3_SEL			(0x10000 << 13)
+
+#define RK3328_GRF_OS_REG2		0x5d0
+
+#define RK3368_GRF_DDRC0_CON0		0x600
+#define RK3368_GRF_SOC_STATUS5		0x494
+#define RK3368_GRF_SOC_STATUS6		0x498
+#define RK3368_GRF_SOC_STATUS8		0x4a0
+#define RK3368_GRF_SOC_STATUS9		0x4a4
+#define RK3368_GRF_SOC_STATUS10		0x4a8
+#define RK3368_DFI_EN			(0x30003 << 5)
+#define RK3368_DFI_DIS			(0x30000 << 5)
+
+#define MAX_DMC_NUM_CH			2
+#define READ_DRAMTYPE_INFO(n)		(((n) >> 13) & 0x7)
+#define READ_CH_INFO(n)			(((n) >> 28) & 0x3)
 /* DDRMON_CTRL */
-#define DDRMON_CTRL	0x04
-#define CLR_DDRMON_CTRL	(0x1f0000 << 0)
-#define LPDDR4_EN	(0x10001 << 4)
-#define HARDWARE_EN	(0x10001 << 3)
-#define LPDDR3_EN	(0x10001 << 2)
-#define SOFTWARE_EN	(0x10001 << 1)
-#define SOFTWARE_DIS	(0x10000 << 1)
-#define TIME_CNT_EN	(0x10001 << 0)
+#define DDRMON_CTRL			0x04
+#define CLR_DDRMON_CTRL			(0x3f0000 << 0)
+#define DDR4_EN				(0x10001 << 5)
+#define LPDDR4_EN			(0x10001 << 4)
+#define HARDWARE_EN			(0x10001 << 3)
+#define LPDDR2_3_EN			(0x10001 << 2)
+#define SOFTWARE_EN			(0x10001 << 1)
+#define SOFTWARE_DIS			(0x10000 << 1)
+#define TIME_CNT_EN			(0x10001 << 0)
 
 #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
 
+/* pmu grf */
+#define PMUGRF_OS_REG2			0x308
+
+enum {
+	DDR4 = 0,
+	DDR3 = 3,
+	LPDDR2 = 5,
+	LPDDR3 = 6,
+	LPDDR4 = 7,
+	UNUSED = 0xFF
+};
+
 struct dmc_usage {
 	u32 access;
 	u32 total;
@@ -50,33 +93,261 @@ struct dmc_usage {
 struct rockchip_dfi {
 	struct devfreq_event_dev *edev;
 	struct devfreq_event_desc *desc;
-	struct dmc_usage ch_usage[RK3399_DMC_NUM_CH];
+	struct dmc_usage ch_usage[MAX_DMC_NUM_CH];
 	struct device *dev;
 	void __iomem *regs;
 	struct regmap *regmap_pmu;
+	struct regmap *regmap_grf;
+	struct regmap *regmap_pmugrf;
 	struct clk *clk;
+	u32 dram_type;
+	/*
+	 * available mask, 1: available, 0: not available
+	 * each bit represent a channel
+	 */
+	u32 ch_msk;
+};
+
+static void rk3128_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+
+	regmap_write(info->regmap_grf,
+		     RK3128_GRF_SOC_CON0,
+		     RK3128_DDR_MONITOR_EN);
+}
+
+static void rk3128_dfi_stop_hardware_counter(struct devfreq_event_dev *edev)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+
+	regmap_write(info->regmap_grf,
+		     RK3128_GRF_SOC_CON0,
+		     RK3128_DDR_MONITOR_DISB);
+}
+
+static int rk3128_dfi_disable(struct devfreq_event_dev *edev)
+{
+	rk3128_dfi_stop_hardware_counter(edev);
+
+	return 0;
+}
+
+static int rk3128_dfi_enable(struct devfreq_event_dev *edev)
+{
+	rk3128_dfi_start_hardware_counter(edev);
+
+	return 0;
+}
+
+static int rk3128_dfi_set_event(struct devfreq_event_dev *edev)
+{
+	return 0;
+}
+
+static int rk3128_dfi_get_event(struct devfreq_event_dev *edev,
+				struct devfreq_event_data *edata)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+	unsigned long flags;
+	u32 dfi_wr, dfi_rd, dfi_timer;
+
+	local_irq_save(flags);
+
+	rk3128_dfi_stop_hardware_counter(edev);
+
+	regmap_read(info->regmap_grf, RK3128_GRF_DFI_WRNUM, &dfi_wr);
+	regmap_read(info->regmap_grf, RK3128_GRF_DFI_RDNUM, &dfi_rd);
+	regmap_read(info->regmap_grf, RK3128_GRF_DFI_TIMERVAL, &dfi_timer);
+
+	edata->load_count = (dfi_wr + dfi_rd) * 4;
+	edata->total_count = dfi_timer;
+
+	rk3128_dfi_start_hardware_counter(edev);
+
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+static const struct devfreq_event_ops rk3128_dfi_ops = {
+	.disable = rk3128_dfi_disable,
+	.enable = rk3128_dfi_enable,
+	.get_event = rk3128_dfi_get_event,
+	.set_event = rk3128_dfi_set_event,
+};
+
+static void rk3288_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+
+	regmap_write(info->regmap_grf, RK3288_GRF_SOC_CON4, RK3288_DFI_EN);
+}
+
+static void rk3288_dfi_stop_hardware_counter(struct devfreq_event_dev *edev)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+
+	regmap_write(info->regmap_grf, RK3288_GRF_SOC_CON4, RK3288_DFI_DIS);
+}
+
+static int rk3288_dfi_disable(struct devfreq_event_dev *edev)
+{
+	rk3288_dfi_stop_hardware_counter(edev);
+
+	return 0;
+}
+
+static int rk3288_dfi_enable(struct devfreq_event_dev *edev)
+{
+	rk3288_dfi_start_hardware_counter(edev);
+
+	return 0;
+}
+
+static int rk3288_dfi_set_event(struct devfreq_event_dev *edev)
+{
+	return 0;
+}
+
+static int rk3288_dfi_get_busier_ch(struct devfreq_event_dev *edev)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+	u32 tmp, max = 0;
+	u32 i, busier_ch = 0;
+	u32 rd_count, wr_count, total_count;
+
+	rk3288_dfi_stop_hardware_counter(edev);
+
+	/* Find out which channel is busier */
+	for (i = 0; i < MAX_DMC_NUM_CH; i++) {
+		if (!(info->ch_msk & BIT(i)))
+			continue;
+		regmap_read(info->regmap_grf,
+			    RK3288_GRF_SOC_STATUS(11 + i * 4), &wr_count);
+		regmap_read(info->regmap_grf,
+			    RK3288_GRF_SOC_STATUS(12 + i * 4), &rd_count);
+		regmap_read(info->regmap_grf,
+			    RK3288_GRF_SOC_STATUS(14 + i * 4), &total_count);
+		info->ch_usage[i].access = (wr_count + rd_count) * 4;
+		info->ch_usage[i].total = total_count;
+		tmp = info->ch_usage[i].access;
+		if (tmp > max) {
+			busier_ch = i;
+			max = tmp;
+		}
+	}
+	rk3288_dfi_start_hardware_counter(edev);
+
+	return busier_ch;
+}
+
+static int rk3288_dfi_get_event(struct devfreq_event_dev *edev,
+				struct devfreq_event_data *edata)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+	int busier_ch;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	busier_ch = rk3288_dfi_get_busier_ch(edev);
+	local_irq_restore(flags);
+
+	edata->load_count = info->ch_usage[busier_ch].access;
+	edata->total_count = info->ch_usage[busier_ch].total;
+
+	return 0;
+}
+
+static const struct devfreq_event_ops rk3288_dfi_ops = {
+	.disable = rk3288_dfi_disable,
+	.enable = rk3288_dfi_enable,
+	.get_event = rk3288_dfi_get_event,
+	.set_event = rk3288_dfi_set_event,
+};
+
+static void rk3368_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+
+	regmap_write(info->regmap_grf, RK3368_GRF_DDRC0_CON0, RK3368_DFI_EN);
+}
+
+static void rk3368_dfi_stop_hardware_counter(struct devfreq_event_dev *edev)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+
+	regmap_write(info->regmap_grf, RK3368_GRF_DDRC0_CON0, RK3368_DFI_DIS);
+}
+
+static int rk3368_dfi_disable(struct devfreq_event_dev *edev)
+{
+	rk3368_dfi_stop_hardware_counter(edev);
+
+	return 0;
+}
+
+static int rk3368_dfi_enable(struct devfreq_event_dev *edev)
+{
+	rk3368_dfi_start_hardware_counter(edev);
+
+	return 0;
+}
+
+static int rk3368_dfi_set_event(struct devfreq_event_dev *edev)
+{
+	return 0;
+}
+
+static int rk3368_dfi_get_event(struct devfreq_event_dev *edev,
+				struct devfreq_event_data *edata)
+{
+	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+	unsigned long flags;
+	u32 dfi0_wr, dfi0_rd, dfi1_wr, dfi1_rd, dfi_timer;
+
+	local_irq_save(flags);
+
+	rk3368_dfi_stop_hardware_counter(edev);
+
+	regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS5, &dfi0_wr);
+	regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS6, &dfi0_rd);
+	regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS9, &dfi1_wr);
+	regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS10, &dfi1_rd);
+	regmap_read(info->regmap_grf, RK3368_GRF_SOC_STATUS8, &dfi_timer);
+
+	edata->load_count = (dfi0_wr + dfi0_rd + dfi1_wr + dfi1_rd) * 2;
+	edata->total_count = dfi_timer;
+
+	rk3368_dfi_start_hardware_counter(edev);
+
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+static const struct devfreq_event_ops rk3368_dfi_ops = {
+	.disable = rk3368_dfi_disable,
+	.enable = rk3368_dfi_enable,
+	.get_event = rk3368_dfi_get_event,
+	.set_event = rk3368_dfi_set_event,
 };
 
 static void rockchip_dfi_start_hardware_counter(struct devfreq_event_dev *edev)
 {
 	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
 	void __iomem *dfi_regs = info->regs;
-	u32 val;
-	u32 ddr_type;
-
-	/* get ddr type */
-	regmap_read(info->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
-	ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
-		    RK3399_PMUGRF_DDRTYPE_MASK;
 
 	/* clear DDRMON_CTRL setting */
 	writel_relaxed(CLR_DDRMON_CTRL, dfi_regs + DDRMON_CTRL);
 
 	/* set ddr type to dfi */
-	if (ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR3)
-		writel_relaxed(LPDDR3_EN, dfi_regs + DDRMON_CTRL);
-	else if (ddr_type == RK3399_PMUGRF_DDRTYPE_LPDDR4)
+	if (info->dram_type == LPDDR3 || info->dram_type == LPDDR2)
+		writel_relaxed(LPDDR2_3_EN, dfi_regs + DDRMON_CTRL);
+	else if (info->dram_type == LPDDR4)
 		writel_relaxed(LPDDR4_EN, dfi_regs + DDRMON_CTRL);
+	else if (info->dram_type == DDR4)
+		writel_relaxed(DDR4_EN, dfi_regs + DDRMON_CTRL);
 
 	/* enable count, use software mode */
 	writel_relaxed(SOFTWARE_EN, dfi_regs + DDRMON_CTRL);
@@ -100,12 +371,22 @@ static int rockchip_dfi_get_busier_ch(struct devfreq_event_dev *edev)
 	rockchip_dfi_stop_hardware_counter(edev);
 
 	/* Find out which channel is busier */
-	for (i = 0; i < RK3399_DMC_NUM_CH; i++) {
-		info->ch_usage[i].access = readl_relaxed(dfi_regs +
-				DDRMON_CH0_DFI_ACCESS_NUM + i * 20) * 4;
+	for (i = 0; i < MAX_DMC_NUM_CH; i++) {
+		if (!(info->ch_msk & BIT(i)))
+			continue;
+
 		info->ch_usage[i].total = readl_relaxed(dfi_regs +
 				DDRMON_CH0_COUNT_NUM + i * 20);
-		tmp = info->ch_usage[i].access;
+
+		/* LPDDR4 BL = 16,other DDR type BL = 8 */
+		tmp = readl_relaxed(dfi_regs +
+				DDRMON_CH0_DFI_ACCESS_NUM + i * 20);
+		if (info->dram_type == LPDDR4)
+			tmp *= 8;
+		else
+			tmp *= 4;
+		info->ch_usage[i].access = tmp;
+
 		if (tmp > max) {
 			busier_ch = i;
 			max = tmp;
@@ -118,10 +399,14 @@ static int rockchip_dfi_get_busier_ch(struct devfreq_event_dev *edev)
 
 static int rockchip_dfi_disable(struct devfreq_event_dev *edev)
 {
+	struct device *dev = &edev->dev;
 	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
 
 	rockchip_dfi_stop_hardware_counter(edev);
-	clk_disable_unprepare(info->clk);
+	if (info->clk)
+		clk_disable_unprepare(info->clk);
+
+	dev_notice(dev,"Rockchip DFI interface disabled\n");
 
 	return 0;
 }
@@ -129,20 +414,28 @@ static int rockchip_dfi_disable(struct devfreq_event_dev *edev)
 static int rockchip_dfi_enable(struct devfreq_event_dev *edev)
 {
 	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
+	struct device *dev = &edev->dev;
 	int ret;
 
-	ret = clk_prepare_enable(info->clk);
-	if (ret) {
-		dev_err(&edev->dev, "failed to enable dfi clk: %d\n", ret);
-		return ret;
+	if (info->clk) {
+		ret = clk_prepare_enable(info->clk);
+		if (ret) {
+			dev_err(&edev->dev, "failed to enable dfi clk: %d\n",
+				ret);
+			return ret;
+		}
 	}
 
 	rockchip_dfi_start_hardware_counter(edev);
+
+	dev_notice(dev,"Rockchip DFI interface enabled\n");
+
 	return 0;
 }
 
 static int rockchip_dfi_set_event(struct devfreq_event_dev *edev)
 {
+
 	return 0;
 }
 
@@ -151,8 +444,11 @@ static int rockchip_dfi_get_event(struct devfreq_event_dev *edev,
 {
 	struct rockchip_dfi *info = devfreq_event_get_drvdata(edev);
 	int busier_ch;
+	unsigned long flags;
 
+	local_irq_save(flags);
 	busier_ch = rockchip_dfi_get_busier_ch(edev);
+	local_irq_restore(flags);
 
 	edata->load_count = info->ch_usage[busier_ch].access;
 	edata->total_count = info->ch_usage[busier_ch].total;
@@ -167,22 +463,151 @@ static const struct devfreq_event_ops rockchip_dfi_ops = {
 	.set_event = rockchip_dfi_set_event,
 };
 
-static const struct of_device_id rockchip_dfi_id_match[] = {
-	{ .compatible = "rockchip,rk3399-dfi" },
-	{ },
-};
-MODULE_DEVICE_TABLE(of, rockchip_dfi_id_match);
+static __init int px30_dfi_init(struct platform_device *pdev,
+				  struct rockchip_dfi *data,
+				  struct devfreq_event_desc *desc)
+{
+	struct device_node *np = pdev->dev.of_node, *node;
+	struct resource *res;
+	u32 val;
 
-static int rockchip_dfi_probe(struct platform_device *pdev)
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->regs))
+		return PTR_ERR(data->regs);
+
+	node = of_parse_phandle(np, "rockchip,pmugrf", 0);
+	if (node) {
+		data->regmap_pmugrf = syscon_node_to_regmap(node);
+		if (IS_ERR(data->regmap_pmugrf))
+			return PTR_ERR(data->regmap_pmugrf);
+	}
+
+	regmap_read(data->regmap_pmugrf, PX30_PMUGRF_OS_REG2, &val);
+	data->dram_type = READ_DRAMTYPE_INFO(val);
+	data->ch_msk = 1;
+	data->clk = NULL;
+
+	desc->ops = &rockchip_dfi_ops;
+
+	return 0;
+}
+
+static __init int rk3128_dfi_init(struct platform_device *pdev,
+				  struct rockchip_dfi *data,
+				  struct devfreq_event_desc *desc)
+{
+	struct device_node *np = pdev->dev.of_node, *node;
+
+	node = of_parse_phandle(np, "rockchip,grf", 0);
+	if (node) {
+		data->regmap_grf = syscon_node_to_regmap(node);
+		if (IS_ERR(data->regmap_grf))
+			return PTR_ERR(data->regmap_grf);
+	}
+
+	desc->ops = &rk3128_dfi_ops;
+
+	return 0;
+}
+
+static __init int rk3228_dfi_init(struct platform_device *pdev,
+				  struct rockchip_dfi *data,
+				  struct devfreq_event_desc *desc)
 {
+	struct device_node *np = pdev->dev.of_node, *node;
+	struct resource *res;
 	struct device *dev = &pdev->dev;
-	struct rockchip_dfi *data;
-	struct devfreq_event_desc *desc;
+	u32 val;
+
+	dev_notice(dev,"rk3228_dfi_init enter\n");
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->regs))
+		return PTR_ERR(data->regs);
+
+	node = of_parse_phandle(np, "rockchip,grf", 0);
+	if (node) {
+		data->regmap_grf = syscon_node_to_regmap(node);
+		if (IS_ERR(data->regmap_grf))
+			return PTR_ERR(data->regmap_grf);
+	}
+
+	regmap_read(data->regmap_grf, RK3228_GRF_OS_REG2, &val);
+	data->dram_type = READ_DRAMTYPE_INFO(val);
+	data->ch_msk = 1;
+	data->clk = NULL;
+
+	desc->ops = &rockchip_dfi_ops;
+
+	dev_notice(dev,"rk3228-dfi initialized, dram type: 0x%x, channels: %d\n", data->dram_type, data->ch_msk);
+
+	return 0;
+}
+
+static __init int rk3288_dfi_init(struct platform_device *pdev,
+				  struct rockchip_dfi *data,
+				  struct devfreq_event_desc *desc)
+{
 	struct device_node *np = pdev->dev.of_node, *node;
+	u32 val;
 
-	data = devm_kzalloc(dev, sizeof(struct rockchip_dfi), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
+	node = of_parse_phandle(np, "rockchip,pmu", 0);
+	if (node) {
+		data->regmap_pmu = syscon_node_to_regmap(node);
+		if (IS_ERR(data->regmap_pmu))
+			return PTR_ERR(data->regmap_pmu);
+	}
+
+	node = of_parse_phandle(np, "rockchip,grf", 0);
+	if (node) {
+		data->regmap_grf = syscon_node_to_regmap(node);
+		if (IS_ERR(data->regmap_grf))
+			return PTR_ERR(data->regmap_grf);
+	}
+
+	regmap_read(data->regmap_pmu, RK3288_PMU_SYS_REG2, &val);
+	data->dram_type = READ_DRAMTYPE_INFO(val);
+	data->ch_msk = READ_CH_INFO(val);
+
+	if (data->dram_type == DDR3)
+		regmap_write(data->regmap_grf, RK3288_GRF_SOC_CON4,
+			     RK3288_DDR3_SEL);
+	else
+		regmap_write(data->regmap_grf, RK3288_GRF_SOC_CON4,
+			     RK3288_LPDDR_SEL);
+
+	desc->ops = &rk3288_dfi_ops;
+
+	return 0;
+}
+
+static __init int rk3368_dfi_init(struct platform_device *pdev,
+				  struct rockchip_dfi *data,
+				  struct devfreq_event_desc *desc)
+{
+	struct device *dev = &pdev->dev;
+
+	if (!dev->parent || !dev->parent->of_node)
+		return -EINVAL;
+
+	data->regmap_grf = syscon_node_to_regmap(dev->parent->of_node);
+	if (IS_ERR(data->regmap_grf))
+		return PTR_ERR(data->regmap_grf);
+
+	desc->ops = &rk3368_dfi_ops;
+
+	return 0;
+}
+
+static __init int rockchip_dfi_init(struct platform_device *pdev,
+				    struct rockchip_dfi *data,
+				    struct devfreq_event_desc *desc)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = pdev->dev.of_node, *node;
+	u32 val;
 
 	data->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(data->regs))
@@ -202,21 +627,98 @@ static int rockchip_dfi_probe(struct platform_device *pdev)
 		if (IS_ERR(data->regmap_pmu))
 			return PTR_ERR(data->regmap_pmu);
 	}
-	data->dev = dev;
+
+	regmap_read(data->regmap_pmu, PMUGRF_OS_REG2, &val);
+	data->dram_type = READ_DRAMTYPE_INFO(val);
+	data->ch_msk = READ_CH_INFO(val);
+
+	desc->ops = &rockchip_dfi_ops;
+
+	return 0;
+}
+
+static __init int rk3328_dfi_init(struct platform_device *pdev,
+				  struct rockchip_dfi *data,
+				  struct devfreq_event_desc *desc)
+{
+	struct device_node *np = pdev->dev.of_node, *node;
+	struct resource *res;
+	u32 val;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->regs))
+		return PTR_ERR(data->regs);
+
+	node = of_parse_phandle(np, "rockchip,grf", 0);
+	if (node) {
+		data->regmap_grf = syscon_node_to_regmap(node);
+		if (IS_ERR(data->regmap_grf))
+			return PTR_ERR(data->regmap_grf);
+	}
+
+	regmap_read(data->regmap_grf, RK3328_GRF_OS_REG2, &val);
+	data->dram_type = READ_DRAMTYPE_INFO(val);
+	data->ch_msk = 1;
+	data->clk = NULL;
+
+	desc->ops = &rockchip_dfi_ops;
+
+	return 0;
+}
+
+static const struct of_device_id rockchip_dfi_id_match[] = {
+	{ .compatible = "rockchip,px30-dfi", .data = px30_dfi_init },
+	{ .compatible = "rockchip,rk1808-dfi", .data = px30_dfi_init },
+	{ .compatible = "rockchip,rk3128-dfi", .data = rk3128_dfi_init },
+	{ .compatible = "rockchip,rk3228-dfi", .data = rk3228_dfi_init },
+	{ .compatible = "rockchip,rk3288-dfi", .data = rk3288_dfi_init },
+	{ .compatible = "rockchip,rk3328-dfi", .data = rk3328_dfi_init },
+	{ .compatible = "rockchip,rk3368-dfi", .data = rk3368_dfi_init },
+	{ .compatible = "rockchip,rk3399-dfi", .data = rockchip_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 *data;
+	struct devfreq_event_desc *desc;
+	struct device_node *np = pdev->dev.of_node;
+	const struct of_device_id *match;
+	int (*init)(struct platform_device *pdev, struct rockchip_dfi *data,
+		    struct devfreq_event_desc *desc);
+
+	data = devm_kzalloc(dev, sizeof(struct rockchip_dfi), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
 
 	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 	if (!desc)
 		return -ENOMEM;
 
-	desc->ops = &rockchip_dfi_ops;
+	match = of_match_node(rockchip_dfi_id_match, pdev->dev.of_node);
+	if (match) {
+		init = match->data;
+		if (init) {
+			if (init(pdev, data, desc))
+				return -EINVAL;
+		} else {
+			return 0;
+		}
+	} else {
+		return 0;
+	}
+
 	desc->driver_data = data;
 	desc->name = np->name;
 	data->desc = desc;
+	data->dev = dev;
 
-	data->edev = devm_devfreq_event_add_edev(&pdev->dev, desc);
+	data->edev = devm_devfreq_event_add_edev(dev, desc);
 	if (IS_ERR(data->edev)) {
-		dev_err(&pdev->dev,
-			"failed to add devfreq-event device\n");
+		dev_err(dev, "failed to add devfreq-event device\n");
 		return PTR_ERR(data->edev);
 	}
 
-- 
2.25.1