PM / devfreq: event: add support for rk3368 dfi

This adds the necessary data for handling dfi on the rk3368.
Access the dfi via registers provided by GRF (general register
files) module.

Change-Id: I96c2b4dcd34d90731b749ebdbe6922f01559d8e6
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>

diff --git a/Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt b/Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt
index d66aca65116420635ec41a9273f6f73b20ef9a15..71be08a0f61bf0a163610a32efb15f25643db8bf 100644 (file)
--- a/Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt
+++ b/Documentation/devicetree/bindings/devfreq/event/rockchip-dfi.txt
@@ -1,8 +1,15 @@
 
-* Rockchip rk3399 DFI device
+* Rockchip DFI device
 
 Required properties:
-- compatible: Must be "rockchip,rk3399-dfi".
+- compatible: Should be one of the following.
+  - "rockchip,rk3368-dfi" - for RK3368 SoCs.
+  - "rockchip,rk3399-dfi" - for RK3399 SoCs.
+
+Required properties for RK3368:
+- rockchip,grf: phandle to the syscon managing the "general register files"
+
+Required properties for RK3399:
 - reg: physical base address of each DFI and length of memory mapped region
 - rockchip,pmu: phandle to the syscon managing the "pmu general register files"
 - clocks: phandles for clock specified in "clock-names" property

diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c
index cd9287faf8fb4c06ac33f39463261af6c46c7132..65074f1af2572fbfa1f46c5066ec900afb5b1253 100644 (file)
--- a/drivers/devfreq/event/rockchip-dfi.c
+++ b/drivers/devfreq/event/rockchip-dfi.c
@@ -26,6 +26,15 @@
 #include <linux/list.h>
 #include <linux/of.h>
 
+#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 RK3399_DMC_NUM_CH      2
 
 /* DDRMON_CTRL */
@@ -72,9 +81,77 @@ struct rockchip_dfi {
        struct device *dev;
        void __iomem *regs;
        struct regmap *regmap_pmu;
+       struct regmap *regmap_grf;
        struct clk *clk;
 };
 
+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);
@@ -187,23 +264,32 @@ 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" },
-       { },
-};
+static __init int rk3368_dfi_init(struct platform_device *pdev,
+                                 struct rockchip_dfi *data,
+                                 struct devfreq_event_desc *desc)
+{
+       struct device *dev = &pdev->dev;
 
-static int rockchip_dfi_probe(struct platform_device *pdev)
+       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 rockchip_dfi *data;
        struct resource *res;
-       struct devfreq_event_desc *desc;
        struct device_node *np = pdev->dev.of_node, *node;
 
-       data = devm_kzalloc(dev, sizeof(struct rockchip_dfi), GFP_KERNEL);
-       if (!data)
-               return -ENOMEM;
-
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        data->regs = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(data->regs))
@@ -222,23 +308,59 @@ static int rockchip_dfi_probe(struct platform_device *pdev)
                if (IS_ERR(data->regmap_pmu))
                        return PTR_ERR(data->regmap_pmu);
        }
-       data->dev = dev;
+
+       desc->ops = &rockchip_dfi_ops;
+
+       return 0;
+}
+
+static const struct of_device_id rockchip_dfi_id_match[] = {
+       { .compatible = "rockchip,rk3368-dfi", .data = rk3368_dfi_init },
+       { .compatible = "rockchip,rk3399-dfi", .data = rockchip_dfi_init },
+       { },
+};
+
+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->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);
        }
+       data->desc = desc;
+       data->dev = &pdev->dev;
 
        platform_set_drvdata(pdev, data);