drivers/hwtracing/coresight/of_coresight.c - kernel/msm-4.19 - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2012,2017-2018,2020 The Linux Foundation. All rights reserved.
  */

 #include <linux/types.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_graph.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/amba/bus.h>
 #include <linux/coresight.h>
 #include <linux/cpumask.h>
 #include <asm/smp_plat.h>
 #include <linux/coresight-cti.h>

 static int of_dev_node_match(struct device *dev, void *data)
 {
 	return dev->of_node == data;
 }

 static struct device *
 of_coresight_get_endpoint_device(struct device_node *endpoint)
 {
 	struct device *dev = NULL;

 	/*
 	 * If we have a non-configurable replicator, it will be found on the
 	 * platform bus.
 	 */
 	dev = bus_find_device(&platform_bus_type, NULL,
 			      endpoint, of_dev_node_match);
 	if (dev)
 		return dev;

 	/*
 	 * We have a configurable component - circle through the AMBA bus
 	 * looking for the device that matches the endpoint node.
 	 */
 	return bus_find_device(&amba_bustype, NULL,
 			       endpoint, of_dev_node_match);
 }

 static void of_coresight_get_ports(const struct device_node *node,
 				   int *nr_inport, int *nr_outport)
 {
 	struct device_node *ep = NULL;
 	int in = 0, out = 0;
 	struct of_endpoint endpoint;

 	do {
 		ep = of_graph_get_next_endpoint(node, ep);
 		if (!ep)
 			break;

 		if (of_graph_parse_endpoint(ep, &endpoint))
 			continue;

 		if (of_property_read_bool(ep, "slave-mode"))
 			in = (endpoint.port + 1 > in) ?
 				endpoint.port + 1 : in;
 		else
 			out = (endpoint.port + 1) > out ?
 				endpoint.port + 1 : out;

 	} while (ep);

 	*nr_inport = in;
 	*nr_outport = out;
 }

 static int of_coresight_alloc_memory(struct device *dev,
 			struct coresight_platform_data *pdata)
 {
 	/* List of output port on this component */
 	pdata->outports = devm_kcalloc(dev,
 				       pdata->nr_outport,
 				       sizeof(*pdata->outports),
 				       GFP_KERNEL);
 	if (!pdata->outports)
 		return -ENOMEM;

 	pdata->source_names = devm_kzalloc(dev, pdata->nr_outport *
 					  sizeof(*pdata->source_names),
 					  GFP_KERNEL);
 	if (!pdata->source_names)
 		return -ENOMEM;

 	/* Children connected to this component via @outports */
 	pdata->child_names = devm_kcalloc(dev,
 					  pdata->nr_outport,
 					  sizeof(*pdata->child_names),
 					  GFP_KERNEL);
 	if (!pdata->child_names)
 		return -ENOMEM;

 	/* Port number on the child this component is connected to */
 	pdata->child_ports = devm_kcalloc(dev,
 					  pdata->nr_outport,
 					  sizeof(*pdata->child_ports),
 					  GFP_KERNEL);
 	if (!pdata->child_ports)
 		return -ENOMEM;

 	return 0;
 }

 int of_coresight_get_cpu(const struct device_node *node)
 {
 	int cpu;
 	struct device_node *dn;

 	dn = of_parse_phandle(node, "cpu", 0);

 	/* Affinity defaults to invalid */
 	if (!dn)
 		return -ENODEV;

 	cpu = of_cpu_node_to_id(dn);
 	of_node_put(dn);

 	/* Affinity to invalid if no cpu nodes are found */
 	return (cpu < 0) ? -ENODEV : cpu;
 }
 EXPORT_SYMBOL_GPL(of_coresight_get_cpu);

 static struct coresight_reg_clk *
 of_coresight_get_reg_clk(struct device *dev, const struct device_node *node)
 {
 	struct coresight_reg_clk *reg_clk;
 	const char *clk_name, *reg_name;
 	int nr_reg, nr_clk, i, ret;

 	nr_reg = of_property_count_strings(node, "qcom,proxy-regs");
 	nr_clk = of_property_count_strings(node, "qcom,proxy-clks");

 	if (nr_reg <= 0 && nr_clk <= 0)
 		return NULL;

 	reg_clk = devm_kzalloc(dev, sizeof(*reg_clk), GFP_KERNEL);
 	if (!reg_clk)
 		return ERR_PTR(-ENOMEM);

 	reg_clk->nr_reg = nr_reg;
 	reg_clk->nr_clk = nr_clk;
 	if (nr_reg > 0) {
 		reg_clk->reg = devm_kzalloc(dev, nr_reg *
 			sizeof(reg_clk->reg), GFP_KERNEL);
 		if (!reg_clk->reg)
 			return ERR_PTR(-ENOMEM);

 		for (i = 0; i < nr_reg; i++) {
 			ret = of_property_read_string_index(node,
 				"qcom,proxy-regs", i, &reg_name);
 			if (ret)
 				return ERR_PTR(ret);
 			reg_clk->reg[i] = devm_regulator_get(dev, reg_name);
 			if (IS_ERR(reg_clk->reg[i]))
 				return ERR_PTR(-EINVAL);
 		}
 	}
 	if (nr_clk > 0) {
 		reg_clk->clk = devm_kzalloc(dev, nr_clk *
 			sizeof(reg_clk->clk), GFP_KERNEL);
 		if (!reg_clk->clk)
 			return ERR_PTR(-ENOMEM);

 		for (i = 0; i < nr_clk; i++) {
 			ret = of_property_read_string_index(node,
 				"qcom,proxy-clks", i, &clk_name);
 			if (ret)
 				return ERR_PTR(ret);
 			reg_clk->clk[i] = devm_clk_get(dev, clk_name);
 			if (IS_ERR(reg_clk->clk[i]))
 				return ERR_PTR(-EINVAL);
 		}
 	}
 	return reg_clk;
 }

 /*
  * of_coresight_parse_endpoint : Parse the given output endpoint @ep
  * and fill the connection information in @pdata[@i].
  *
  * Parses the local port, remote device name and the remote port.
  *
  * Returns :
  *	 1	- If the parsing is successful and a connection record
  *		  was created for an output connection.
  *	 0	- If the parsing completed without any fatal errors.
  *	-Errno	- Fatal error, abort the scanning.
  */
 static int of_coresight_parse_endpoint(struct device *dev,
 				       struct device_node *ep,
 				       struct coresight_platform_data *pdata,
 				       int i)
 {
 	int ret = 0;
 	struct of_endpoint endpoint, rendpoint;
 	struct device_node *rparent = NULL;
 	struct device_node *rep = NULL;
 	struct device *rdev = NULL;
 	struct device_node *sn = NULL;

 	do {
 		/* Parse the local port details */
 		if (of_graph_parse_endpoint(ep, &endpoint))
 			break;
 		/*
 		 * Get a handle on the remote endpoint and the device it is
 		 * attached to.
 		 */
 		rep = of_graph_get_remote_endpoint(ep);
 		if (!rep)
 			break;
 		rparent = of_graph_get_port_parent(rep);
 		if (!rparent)
 			break;
 		if (of_graph_parse_endpoint(rep, &rendpoint))
 			break;

 		/* If the remote device is not available, defer probing */
 		rdev = of_coresight_get_endpoint_device(rparent);
 		if (!rdev) {
 			ret = -EPROBE_DEFER;
 			break;
 		}

 		pdata->outports[i] = endpoint.port;
 		ret = of_property_read_string(rparent, "coresight-name",
 						&pdata->child_names[i]);
 		if (ret)
 			pdata->child_names[i] = devm_kstrdup(dev,
 						     dev_name(rdev),
 						     GFP_KERNEL);
 		pdata->child_ports[i] = rendpoint.port;

 		pdata->source_names[i] = NULL;
 		sn = of_parse_phandle(ep, "source", 0);
 		if (sn) {
 			ret = of_property_read_string(sn,
 				"coresight-name", &pdata->source_names[i]);
 			of_node_put(sn);
 		}
 		/* Connection record updated */
 		ret = 1;
 	} while (0);

 	if (rparent)
 		of_node_put(rparent);
 	if (rep)
 		of_node_put(rep);
 	if (rdev)
 		put_device(rdev);

 	return ret;
 }

 struct coresight_platform_data *
 of_get_coresight_platform_data(struct device *dev,
 			       const struct device_node *node)
 {
 	int i = 0, ret = 0;
 	struct coresight_platform_data *pdata;
 	struct device_node *ep = NULL;

 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return ERR_PTR(-ENOMEM);

 	ret = of_property_read_string(node, "coresight-name", &pdata->name);
 	if (ret) {
 		/* 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 */
 	of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);

 	/* If there are no output connections, we are done */
 	if (!pdata->nr_outport)
 		return pdata;

 	ret = of_coresight_alloc_memory(dev, pdata);
 	if (ret)
 		return ERR_PTR(ret);

 	/* Iterate through each port to discover topology */
 	while ((ep = of_graph_get_next_endpoint(node, ep))) {
 		/*
 		 * No need to deal with input ports, as processing the
 		 * output ports connected to them will process the details.
 		 */
 		if (of_find_property(ep, "slave-mode", NULL))
 			continue;

 		ret = of_coresight_parse_endpoint(dev, ep, pdata, i);
 		switch (ret) {
 		case 1:
 			i++;		/* Fall through */
 		case 0:
 			break;
 		default:
 			return ERR_PTR(ret);
 		}
 	}

 	pdata->reg_clk = of_coresight_get_reg_clk(dev, node);
 	if (IS_ERR(pdata->reg_clk))
 		return (void *)(pdata->reg_clk);

 	return pdata;
 }
 EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);

 int of_get_coresight_csr_name(struct device_node *node, const char **csr_name)
 {
 	int  ret;
 	struct device_node *csr_node;

 	csr_node = of_parse_phandle(node, "coresight-csr", 0);
 	if (!csr_node)
 		return -EINVAL;

 	ret = of_property_read_string(csr_node, "coresight-name", csr_name);
 	of_node_put(csr_node);
 	if (ret)
 		return ret;

 	return 0;
 }
 EXPORT_SYMBOL(of_get_coresight_csr_name);

 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);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2012,2017-2018,2020 The Linux Foundation. All rights reserved.
	*/

	#include <linux/types.h>
	#include <linux/err.h>
	#include <linux/slab.h>
	#include <linux/clk.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_graph.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>
	#include <linux/amba/bus.h>
	#include <linux/coresight.h>
	#include <linux/cpumask.h>
	#include <asm/smp_plat.h>
	#include <linux/coresight-cti.h>

	static int of_dev_node_match(struct device dev, void data)
	{
	return dev->of_node == data;
	}

	static struct device *
	of_coresight_get_endpoint_device(struct device_node *endpoint)
	{
	struct device *dev = NULL;

	/*
	* If we have a non-configurable replicator, it will be found on the
	* platform bus.
	*/
	dev = bus_find_device(&platform_bus_type, NULL,
	endpoint, of_dev_node_match);
	if (dev)
	return dev;

	/*
	* We have a configurable component - circle through the AMBA bus
	* looking for the device that matches the endpoint node.
	*/
	return bus_find_device(&amba_bustype, NULL,
	endpoint, of_dev_node_match);
	}

	static void of_coresight_get_ports(const struct device_node *node,
	int nr_inport, int nr_outport)
	{
	struct device_node *ep = NULL;
	int in = 0, out = 0;
	struct of_endpoint endpoint;

	do {
	ep = of_graph_get_next_endpoint(node, ep);
	if (!ep)
	break;

	if (of_graph_parse_endpoint(ep, &endpoint))
	continue;

	if (of_property_read_bool(ep, "slave-mode"))
	in = (endpoint.port + 1 > in) ?
	endpoint.port + 1 : in;
	else
	out = (endpoint.port + 1) > out ?
	endpoint.port + 1 : out;

	} while (ep);

	*nr_inport = in;
	*nr_outport = out;
	}

	static int of_coresight_alloc_memory(struct device *dev,
	struct coresight_platform_data *pdata)
	{
	/* List of output port on this component */
	pdata->outports = devm_kcalloc(dev,
	pdata->nr_outport,
	sizeof(*pdata->outports),
	GFP_KERNEL);
	if (!pdata->outports)
	return -ENOMEM;

	pdata->source_names = devm_kzalloc(dev, pdata->nr_outport *
	sizeof(*pdata->source_names),
	GFP_KERNEL);
	if (!pdata->source_names)
	return -ENOMEM;

	/* Children connected to this component via @outports */
	pdata->child_names = devm_kcalloc(dev,
	pdata->nr_outport,
	sizeof(*pdata->child_names),
	GFP_KERNEL);
	if (!pdata->child_names)
	return -ENOMEM;

	/* Port number on the child this component is connected to */
	pdata->child_ports = devm_kcalloc(dev,
	pdata->nr_outport,
	sizeof(*pdata->child_ports),
	GFP_KERNEL);
	if (!pdata->child_ports)
	return -ENOMEM;

	return 0;
	}

	int of_coresight_get_cpu(const struct device_node *node)
	{
	int cpu;
	struct device_node *dn;

	dn = of_parse_phandle(node, "cpu", 0);

	/* Affinity defaults to invalid */
	if (!dn)
	return -ENODEV;

	cpu = of_cpu_node_to_id(dn);
	of_node_put(dn);

	/* Affinity to invalid if no cpu nodes are found */
	return (cpu < 0) ? -ENODEV : cpu;
	}
	EXPORT_SYMBOL_GPL(of_coresight_get_cpu);

	static struct coresight_reg_clk *
	of_coresight_get_reg_clk(struct device dev, const struct device_node node)
	{
	struct coresight_reg_clk *reg_clk;
	const char clk_name, reg_name;
	int nr_reg, nr_clk, i, ret;

	nr_reg = of_property_count_strings(node, "qcom,proxy-regs");
	nr_clk = of_property_count_strings(node, "qcom,proxy-clks");

	if (nr_reg <= 0 && nr_clk <= 0)
	return NULL;

	reg_clk = devm_kzalloc(dev, sizeof(*reg_clk), GFP_KERNEL);
	if (!reg_clk)
	return ERR_PTR(-ENOMEM);

	reg_clk->nr_reg = nr_reg;
	reg_clk->nr_clk = nr_clk;
	if (nr_reg > 0) {
	reg_clk->reg = devm_kzalloc(dev, nr_reg *
	sizeof(reg_clk->reg), GFP_KERNEL);
	if (!reg_clk->reg)
	return ERR_PTR(-ENOMEM);

	for (i = 0; i < nr_reg; i++) {
	ret = of_property_read_string_index(node,
	"qcom,proxy-regs", i, &reg_name);
	if (ret)
	return ERR_PTR(ret);
	reg_clk->reg[i] = devm_regulator_get(dev, reg_name);
	if (IS_ERR(reg_clk->reg[i]))
	return ERR_PTR(-EINVAL);
	}
	}
	if (nr_clk > 0) {
	reg_clk->clk = devm_kzalloc(dev, nr_clk *
	sizeof(reg_clk->clk), GFP_KERNEL);
	if (!reg_clk->clk)
	return ERR_PTR(-ENOMEM);

	for (i = 0; i < nr_clk; i++) {
	ret = of_property_read_string_index(node,
	"qcom,proxy-clks", i, &clk_name);
	if (ret)
	return ERR_PTR(ret);
	reg_clk->clk[i] = devm_clk_get(dev, clk_name);
	if (IS_ERR(reg_clk->clk[i]))
	return ERR_PTR(-EINVAL);
	}
	}
	return reg_clk;
	}

	/*
	* of_coresight_parse_endpoint : Parse the given output endpoint @ep
	* and fill the connection information in @pdata[@i].
	*
	* Parses the local port, remote device name and the remote port.
	*
	* Returns :
	* 1 - If the parsing is successful and a connection record
	* was created for an output connection.
	* 0 - If the parsing completed without any fatal errors.
	* -Errno - Fatal error, abort the scanning.
	*/
	static int of_coresight_parse_endpoint(struct device *dev,
	struct device_node *ep,
	struct coresight_platform_data *pdata,
	int i)
	{
	int ret = 0;
	struct of_endpoint endpoint, rendpoint;
	struct device_node *rparent = NULL;
	struct device_node *rep = NULL;
	struct device *rdev = NULL;
	struct device_node *sn = NULL;

	do {
	/* Parse the local port details */
	if (of_graph_parse_endpoint(ep, &endpoint))
	break;
	/*
	* Get a handle on the remote endpoint and the device it is
	* attached to.
	*/
	rep = of_graph_get_remote_endpoint(ep);
	if (!rep)
	break;
	rparent = of_graph_get_port_parent(rep);
	if (!rparent)
	break;
	if (of_graph_parse_endpoint(rep, &rendpoint))
	break;

	/* If the remote device is not available, defer probing */
	rdev = of_coresight_get_endpoint_device(rparent);
	if (!rdev) {
	ret = -EPROBE_DEFER;
	break;
	}

	pdata->outports[i] = endpoint.port;
	ret = of_property_read_string(rparent, "coresight-name",
	&pdata->child_names[i]);
	if (ret)
	pdata->child_names[i] = devm_kstrdup(dev,
	dev_name(rdev),
	GFP_KERNEL);
	pdata->child_ports[i] = rendpoint.port;

	pdata->source_names[i] = NULL;
	sn = of_parse_phandle(ep, "source", 0);
	if (sn) {
	ret = of_property_read_string(sn,
	"coresight-name", &pdata->source_names[i]);
	of_node_put(sn);
	}
	/* Connection record updated */
	ret = 1;
	} while (0);

	if (rparent)
	of_node_put(rparent);
	if (rep)
	of_node_put(rep);
	if (rdev)
	put_device(rdev);

	return ret;
	}

	struct coresight_platform_data *
	of_get_coresight_platform_data(struct device *dev,
	const struct device_node *node)
	{
	int i = 0, ret = 0;
	struct coresight_platform_data *pdata;
	struct device_node *ep = NULL;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return ERR_PTR(-ENOMEM);

	ret = of_property_read_string(node, "coresight-name", &pdata->name);
	if (ret) {
	/* 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 */
	of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);

	/* If there are no output connections, we are done */
	if (!pdata->nr_outport)
	return pdata;

	ret = of_coresight_alloc_memory(dev, pdata);
	if (ret)
	return ERR_PTR(ret);

	/* Iterate through each port to discover topology */
	while ((ep = of_graph_get_next_endpoint(node, ep))) {
	/*
	* No need to deal with input ports, as processing the
	* output ports connected to them will process the details.
	*/
	if (of_find_property(ep, "slave-mode", NULL))
	continue;

	ret = of_coresight_parse_endpoint(dev, ep, pdata, i);
	switch (ret) {
	case 1:
	i++; /* Fall through */
	case 0:
	break;
	default:
	return ERR_PTR(ret);
	}
	}

	pdata->reg_clk = of_coresight_get_reg_clk(dev, node);
	if (IS_ERR(pdata->reg_clk))
	return (void *)(pdata->reg_clk);

	return pdata;
	}
	EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);

	int of_get_coresight_csr_name(struct device_node node, const char *csr_name)
	{
	int ret;
	struct device_node *csr_node;

	csr_node = of_parse_phandle(node, "coresight-csr", 0);
	if (!csr_node)
	return -EINVAL;

	ret = of_property_read_string(csr_node, "coresight-name", csr_name);
	of_node_put(csr_node);
	if (ret)
	return ret;

	return 0;
	}
	EXPORT_SYMBOL(of_get_coresight_csr_name);

	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);