coresight: Introduce generic platform data helper

So far we have hard coded the DT platform parsing code in
every driver. Introduce generic helper to parse the information
provided by the firmware in a platform agnostic manner, in preparation
for the ACPI support.
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hwtracing/coresight/coresight-catu.c

@@ -503,17 +503,14 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
 	struct coresight_desc catu_desc;
 	struct coresight_platform_data *pdata = NULL;
 	struct device *dev = &adev->dev;
-	struct device_node *np = dev->of_node;
 	void __iomem *base;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
+	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata)) {
 		ret = PTR_ERR(pdata);
 		goto out;
 	}
 	dev->platform_data = pdata;
-	}
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata) {

drivers/hwtracing/coresight/coresight-etb10.c

@@ -732,14 +732,11 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 	struct etb_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
+	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
 	adev->dev.platform_data = pdata;
-	}
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)

drivers/hwtracing/coresight/coresight-etm3x.c

@@ -790,20 +790,16 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
 	struct etm_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
+	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
 
 	adev->dev.platform_data = pdata;
-	}
-
 	drvdata->use_cp14 = fwnode_property_read_bool(dev->fwnode, "arm,cp14");
 	dev_set_drvdata(dev, drvdata);
 

drivers/hwtracing/coresight/coresight-etm4x.c

@@ -1084,18 +1084,15 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
 	struct etmv4_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
+	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
 	adev->dev.platform_data = pdata;
-	}
 
 	dev_set_drvdata(dev, drvdata);
 

drivers/hwtracing/coresight/coresight-funnel.c

@@ -187,14 +187,11 @@ static int funnel_probe(struct device *dev, struct resource *res)
 	struct coresight_platform_data *pdata = NULL;
 	struct funnel_drvdata *drvdata;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = dev->of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
+	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
 	dev->platform_data = pdata;
-	}
 
 	if (is_of_node(dev_fwnode(dev)) &&
 	    of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))

drivers/hwtracing/coresight/coresight-platform.c

@@ -230,23 +230,16 @@ static int of_coresight_parse_endpoint(struct device *dev,
 	return ret;
 }
 
-struct coresight_platform_data *
-of_get_coresight_platform_data(struct device *dev,
-			       const struct device_node *node)
+static int of_get_coresight_platform_data(struct device *dev,
+					  struct coresight_platform_data *pdata)
 {
 	int ret = 0;
-	struct coresight_platform_data *pdata;
 	struct coresight_connection *conn;
 	struct device_node *ep = NULL;
 	const struct device_node *parent = NULL;
 	bool legacy_binding = false;
+	struct device_node *node = dev->of_node;
 
-	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
-	if (!pdata)
-		return ERR_PTR(-ENOMEM);
-
-	/* Use device name as sysfs handle */
-	pdata->name = dev_name(dev);
 	pdata->cpu = of_coresight_get_cpu(node);
 
 	/* Get the number of input and output port for this component */
@@ -254,11 +247,11 @@ of_get_coresight_platform_data(struct device *dev,
 
 	/* If there are no output connections, we are done */
 	if (!pdata->nr_outport)
-		return pdata;
+		return 0;
 
 	ret = coresight_alloc_conns(dev, pdata);
 	if (ret)
-		return ERR_PTR(ret);
+		return ret;
 
 	parent = of_coresight_get_output_ports_node(node);
 	/*
@@ -292,11 +285,46 @@ of_get_coresight_platform_data(struct device *dev,
 		case 0:
 			break;
 		default:
-			return ERR_PTR(ret);
+			return ret;
 		}
 	}
 
-	return pdata;
+	return 0;
+}
+#else
+static inline int
+of_get_coresight_platform_data(struct device *dev,
+			       struct coresight_platform_data *pdata)
+{
+	return -ENOENT;
 }
-EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
 #endif
+
+struct coresight_platform_data *
+coresight_get_platform_data(struct device *dev)
+{
+	int ret = -ENOENT;
+	struct coresight_platform_data *pdata;
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+
+	if (IS_ERR_OR_NULL(fwnode))
+		goto error;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	/* Use device name as sysfs handle */
+	pdata->name = dev_name(dev);
+
+	if (is_of_node(fwnode))
+		ret = of_get_coresight_platform_data(dev, pdata);
+
+	if (!ret)
+		return pdata;
+error:
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(coresight_get_platform_data);

drivers/hwtracing/coresight/coresight-replicator.c

@@ -177,15 +177,12 @@ static int replicator_probe(struct device *dev, struct resource *res)
 	struct coresight_platform_data *pdata = NULL;
 	struct replicator_drvdata *drvdata;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = dev->of_node;
 	void __iomem *base;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
+	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
 	dev->platform_data = pdata;
-	}
 
 	if (is_of_node(dev_fwnode(dev)) &&
 	    of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))

drivers/hwtracing/coresight/coresight-stm.c

@@ -809,14 +809,11 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	struct resource ch_res;
 	size_t bitmap_size;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
+	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
 	adev->dev.platform_data = pdata;
-	}
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;

drivers/hwtracing/coresight/coresight-tmc.c

@@ -397,16 +397,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 	struct tmc_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
+	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata)) {
 		ret = PTR_ERR(pdata);
 		goto out;
 	}
 	adev->dev.platform_data = pdata;
-	}
 
 	ret = -ENOMEM;
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);

drivers/hwtracing/coresight/coresight-tpiu.c

@@ -124,14 +124,11 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 	struct tpiu_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
-	struct device_node *np = adev->dev.of_node;
 
-	if (np) {
-		pdata = of_get_coresight_platform_data(dev, np);
+	pdata = coresight_get_platform_data(dev);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
-		adev->dev.platform_data = pdata;
-	}
+	dev->platform_data = pdata;
 
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)

include/linux/coresight.h

@@ -294,14 +294,11 @@ static inline void coresight_disclaim_device_unlocked(void __iomem *base) {}
 
 #ifdef CONFIG_OF
 extern int of_coresight_get_cpu(const struct device_node *node);
-extern struct coresight_platform_data *
-of_get_coresight_platform_data(struct device *dev,
-			       const struct device_node *node);
 #else
 static inline int of_coresight_get_cpu(const struct device_node *node)
 { return 0; }
-static inline struct coresight_platform_data *of_get_coresight_platform_data(
-	struct device *dev, const struct device_node *node) { return NULL; }
 #endif
 
+struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
+
 #endif