From 7d494650c32b81e22b0268b1209118ea11253a97 Mon Sep 17 00:00:00 2001
From: Liang Chen <cl@rock-chips.com>
Date: Tue, 5 Sep 2017 15:32:02 +0800
Subject: [PATCH] PM / devfreq: event: add support for rk3128 dfi

This adds the necessary data for handling dfi on the rk3128.
Access the dfi via registers provided by GRF (general register
files) module.

Change-Id: Ife9e9987224088434e878102b7d1c3b132e761ad
Signed-off-by: Liang Chen <cl@rock-chips.com>
---
 .../bindings/devfreq/event/rockchip-dfi.txt   |  1 +
 drivers/devfreq/event/rockchip-dfi.c          | 96 +++++++++++++++++++
 2 files changed, 97 insertions(+)

--- a/Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt
+++ b/Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt
@@ -3,6 +3,7 @@
 
 Required properties:
 - compatible: Should be one of the following.
+  - "rockchip,rk3128-dfi" - for RK3128 SoCs.
   - "rockchip,rk3288-dfi" - for RK3288 SoCs.
   - "rockchip,rk3368-dfi" - for RK3368 SoCs.
   - "rockchip,rk3399-dfi" - for RK3399 SoCs.
--- a/drivers/devfreq/event/rockchip-dfi.c
+++ b/drivers/devfreq/event/rockchip-dfi.c
@@ -20,6 +20,14 @@
 
 #include <soc/rockchip/rk3399_grf.h>
 
+#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 RK3288_PMU_SYS_REG2		0x9c
 #define RK3288_GRF_SOC_CON4		0x254
 #define RK3288_GRF_SOC_STATUS(n)	(0x280 + (n) * 4)
@@ -83,6 +91,75 @@ struct rockchip_dfi {
 	struct clk *clk;
 };
 
+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);
@@ -350,6 +427,24 @@ static const struct devfreq_event_ops ro
 	.set_event = rockchip_dfi_set_event,
 };
 
+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 rk3288_dfi_init(struct platform_device *pdev,
 				  struct rockchip_dfi *data,
 				  struct devfreq_event_desc *desc)
@@ -435,6 +530,7 @@ static __init int rockchip_dfi_init(stru
 }
 
 static const struct of_device_id rockchip_dfi_id_match[] = {
+	{ .compatible = "rockchip,rk3128-dfi", .data = rk3128_dfi_init },
 	{ .compatible = "rockchip,rk3288-dfi", .data = rk3288_dfi_init },
 	{ .compatible = "rockchip,rk3368-dfi", .data = rk3368_dfi_init },
 	{ .compatible = "rockchip,rk3399-dfi", .data = rockchip_dfi_init },