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Commit 330e959a authored by Shashank Mittal's avatar Shashank Mittal Committed by Kyle Yan
Browse files

coresight: add support to read cti data 



Add support to read cti data from OF nodes.

Devices can use this data to configure CTIs as part of their
configurations.

Change-Id: I55b0534ab4d81b9ce02378b513e6ae9bc3b6cd1e
Signed-off-by: default avatarShashank Mittal <mittals@codeaurora.org>
parent ce3d488f

Documentation/devicetree/bindings/arm/coresight.txt

+2 −0
Original line number Diff line number Diff line
@@ -76,6 +76,8 @@ its hardware characteristcs. 


	* arm,default-sink: represents the default compile time CoreSight sink



	* coresight-ctis: represents flush and reset CTIs for TMC buffer



* Required property for TPDAs:



	* qcom,tpda-atid: must be present. Specifies the ATID for TPDA.

drivers/hwtracing/coresight/of_coresight.c

+43 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/platform_device.h>

#include <linux/amba/bus.h>

#include <linux/coresight.h>

#include <linux/coresight-cti.h>

#include <linux/cpumask.h>

#include <asm/smp_plat.h>
@@ -194,3 +195,45 @@ struct coresight_platform_data *of_get_coresight_platform_data( 
	return pdata;

}

EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);



struct coresight_cti_data *of_get_coresight_cti_data(

				struct device *dev, struct device_node *node)

{

	int i, ret;

	uint32_t ctis_len;

	struct device_node *child_node;

	struct coresight_cti_data *ctidata;



	ctidata = devm_kzalloc(dev, sizeof(*ctidata), GFP_KERNEL);

	if (!ctidata)

		return ERR_PTR(-ENOMEM);



	if (of_get_property(node, "coresight-ctis", &ctis_len))

		ctidata->nr_ctis = ctis_len/sizeof(uint32_t);

	else

		return ERR_PTR(-EINVAL);



	if (ctidata->nr_ctis) {

		ctidata->names = devm_kzalloc(dev, ctidata->nr_ctis *

					      sizeof(*ctidata->names),

					      GFP_KERNEL);

		if (!ctidata->names)

			return ERR_PTR(-ENOMEM);



		for (i = 0; i < ctidata->nr_ctis; i++) {

			child_node = of_parse_phandle(node, "coresight-ctis",

						      i);

			if (!child_node)

				return ERR_PTR(-EINVAL);



			ret = of_property_read_string(child_node,

						      "coresight-name",

						      &ctidata->names[i]);

			of_node_put(child_node);

			if (ret)

				return ERR_PTR(ret);

		}

	}

	return ctidata;

}

EXPORT_SYMBOL(of_get_coresight_cti_data);

include/linux/coresight.h

+4 −0
Original line number Diff line number Diff line
@@ -253,9 +253,13 @@ static inline int coresight_timeout(void __iomem *addr, u32 offset, 
#if defined(CONFIG_OF) && defined(CONFIG_CORESIGHT)

extern struct coresight_platform_data *of_get_coresight_platform_data(

				struct device *dev, struct device_node *node);

extern struct coresight_cti_data *of_get_coresight_cti_data(

				struct device *dev, struct device_node *node);

#else

static inline struct coresight_platform_data *of_get_coresight_platform_data(

	struct device *dev, struct device_node *node) { return NULL; }

static inline struct coresight_cti_data *of_get_coresight_cti_data(

	struct device *dev, struct device_node *node) { return NULL; }

#endif



#ifdef CONFIG_PID_NS