[deliverable/linux.git] / drivers / hwtracing / coresight / of_coresight.c

/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#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>


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(struct device_node *node,
				   int *nr_inport, int *nr_outport)
{
	struct device_node *ep = NULL;
	int in = 0, out = 0;

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

		if (of_property_read_bool(ep, "slave-mode"))
			in++;
		else
			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_kzalloc(dev, pdata->nr_outport *
				       sizeof(*pdata->outports),
				       GFP_KERNEL);
	if (!pdata->outports)
		return -ENOMEM;

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

	return 0;
}

struct coresight_platform_data *of_get_coresight_platform_data(
				struct device *dev, struct device_node *node)
{
	int i = 0, ret = 0, cpu;
	struct coresight_platform_data *pdata;
	struct of_endpoint endpoint, rendpoint;
	struct device *rdev;
	struct device_node *dn;
	struct device_node *ep = NULL;
	struct device_node *rparent = NULL;
	struct device_node *rport = NULL;

	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);

	/* Get the number of input and output port for this component */
	of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);

	if (pdata->nr_outport) {
		ret = of_coresight_alloc_memory(dev, pdata);
		if (ret)
			return ERR_PTR(ret);

		/* Iterate through each port to discover topology */
		do {
			/* Get a handle on a port */
			ep = of_graph_get_next_endpoint(node, ep);
			if (!ep)
				break;

			/*
			 * No need to deal with input ports, processing for as
			 * processing for output ports will deal with them.
			 */
			if (of_find_property(ep, "slave-mode", NULL))
				continue;

			/* Get a handle on the local endpoint */
			ret = of_graph_parse_endpoint(ep, &endpoint);

			if (ret)
				continue;

			/* The local out port number */
			pdata->outports[i] = endpoint.id;

			/*
			 * Get a handle on the remote port and parent
			 * attached to it.
			 */
			rparent = of_graph_get_remote_port_parent(ep);
			rport = of_graph_get_remote_port(ep);

			if (!rparent || !rport)
				continue;

			if (of_graph_parse_endpoint(rport, &rendpoint))
				continue;

			rdev = of_coresight_get_endpoint_device(rparent);
			if (!rdev)
				return ERR_PTR(-EPROBE_DEFER);

			pdata->child_names[i] = dev_name(rdev);
			pdata->child_ports[i] = rendpoint.id;

			i++;
		} while (ep);
	}

	/* Affinity defaults to CPU0 */
	pdata->cpu = 0;
	dn = of_parse_phandle(node, "cpu", 0);
	for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) {
		if (dn == of_get_cpu_node(cpu, NULL)) {
			pdata->cpu = cpu;
			break;
		}
	}
	of_node_put(dn);

	return pdata;
}
EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
Commit	Line	Data
a06ae860 PP	1	/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License version 2 and
	5	* only version 2 as published by the Free Software Foundation.
	6	*
	7	* This program is distributed in the hope that it will be useful,
	8	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	* GNU General Public License for more details.
	11	*/
	12
a06ae860 PP	13	#include <linux/types.h>
	14	#include <linux/err.h>
	15	#include <linux/slab.h>
	16	#include <linux/clk.h>
	17	#include <linux/of.h>
	18	#include <linux/of_address.h>
	19	#include <linux/of_graph.h>
	20	#include <linux/of_platform.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/amba/bus.h>
	23	#include <linux/coresight.h>
8c02a5ba	24	#include <linux/cpumask.h>
a06ae860 PP	25	#include <asm/smp_plat.h>
	26
	27
	28	static int of_dev_node_match(struct device dev, void data)
	29	{
	30	return dev->of_node == data;
	31	}
	32
	33	static struct device *
	34	of_coresight_get_endpoint_device(struct device_node *endpoint)
	35	{
	36	struct device *dev = NULL;
	37
	38	/*
43701236	39	* If we have a non-configurable replicator, it will be found on the
a06ae860 PP	40	* platform bus.
	41	*/
	42	dev = bus_find_device(&platform_bus_type, NULL,
	43	endpoint, of_dev_node_match);
	44	if (dev)
	45	return dev;
	46
	47	/*
	48	* We have a configurable component - circle through the AMBA bus
	49	* looking for the device that matches the endpoint node.
	50	*/
	51	return bus_find_device(&amba_bustype, NULL,
	52	endpoint, of_dev_node_match);
	53	}
	54
a06ae860 PP	55	static void of_coresight_get_ports(struct device_node *node,
	56	int nr_inport, int nr_outport)
	57	{
	58	struct device_node *ep = NULL;
	59	int in = 0, out = 0;
	60
	61	do {
f033c0bc	62	ep = of_graph_get_next_endpoint(node, ep);
a06ae860 PP	63	if (!ep)
	64	break;
	65
	66	if (of_property_read_bool(ep, "slave-mode"))
	67	in++;
	68	else
	69	out++;
	70
	71	} while (ep);
	72
	73	*nr_inport = in;
	74	*nr_outport = out;
	75	}
	76
	77	static int of_coresight_alloc_memory(struct device *dev,
	78	struct coresight_platform_data *pdata)
	79	{
	80	/* List of output port on this component */
	81	pdata->outports = devm_kzalloc(dev, pdata->nr_outport *
	82	sizeof(*pdata->outports),
	83	GFP_KERNEL);
	84	if (!pdata->outports)
	85	return -ENOMEM;
	86
f7c55298	87	/* Children connected to this component via @outports */
bf16e5b8	88	pdata->child_names = devm_kzalloc(dev, pdata->nr_outport *
a06ae860 PP	89	sizeof(*pdata->child_names),
	90	GFP_KERNEL);
	91	if (!pdata->child_names)
	92	return -ENOMEM;
	93
	94	/* Port number on the child this component is connected to */
	95	pdata->child_ports = devm_kzalloc(dev, pdata->nr_outport *
	96	sizeof(*pdata->child_ports),
	97	GFP_KERNEL);
	98	if (!pdata->child_ports)
	99	return -ENOMEM;
	100
	101	return 0;
	102	}
	103
	104	struct coresight_platform_data *of_get_coresight_platform_data(
	105	struct device dev, struct device_node node)
	106	{
8c02a5ba	107	int i = 0, ret = 0, cpu;
a06ae860 PP	108	struct coresight_platform_data *pdata;
	109	struct of_endpoint endpoint, rendpoint;
	110	struct device *rdev;
34a03c1d	111	struct device_node *dn;
a06ae860 PP	112	struct device_node *ep = NULL;
	113	struct device_node *rparent = NULL;
	114	struct device_node *rport = NULL;
	115
	116	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	117	if (!pdata)
	118	return ERR_PTR(-ENOMEM);
	119
ff1e33b0	120	/* Use device name as sysfs handle */
a06ae860 PP	121	pdata->name = dev_name(dev);
	122
	123	/* Get the number of input and output port for this component */
	124	of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
	125
	126	if (pdata->nr_outport) {
	127	ret = of_coresight_alloc_memory(dev, pdata);
	128	if (ret)
	129	return ERR_PTR(ret);
	130
	131	/* Iterate through each port to discover topology */
	132	do {
	133	/* Get a handle on a port */
f033c0bc	134	ep = of_graph_get_next_endpoint(node, ep);
a06ae860 PP	135	if (!ep)
	136	break;
	137
	138	/*
	139	* No need to deal with input ports, processing for as
	140	* processing for output ports will deal with them.
	141	*/
	142	if (of_find_property(ep, "slave-mode", NULL))
	143	continue;
	144
	145	/* Get a handle on the local endpoint */
	146	ret = of_graph_parse_endpoint(ep, &endpoint);
	147
	148	if (ret)
	149	continue;
	150
	151	/* The local out port number */
	152	pdata->outports[i] = endpoint.id;
	153
	154	/*
	155	* Get a handle on the remote port and parent
	156	* attached to it.
	157	*/
	158	rparent = of_graph_get_remote_port_parent(ep);
	159	rport = of_graph_get_remote_port(ep);
	160
	161	if (!rparent \|\| !rport)
	162	continue;
	163
	164	if (of_graph_parse_endpoint(rport, &rendpoint))
	165	continue;
	166
	167	rdev = of_coresight_get_endpoint_device(rparent);
2ccffaf9	168	if (!rdev)
62d39ac9	169	return ERR_PTR(-EPROBE_DEFER);
a06ae860 PP	170
	171	pdata->child_names[i] = dev_name(rdev);
	172	pdata->child_ports[i] = rendpoint.id;
	173
	174	i++;
	175	} while (ep);
	176	}
	177
	178	/* Affinity defaults to CPU0 */
	179	pdata->cpu = 0;
34a03c1d	180	dn = of_parse_phandle(node, "cpu", 0);
8c02a5ba MP	181	for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) {
	182	if (dn == of_get_cpu_node(cpu, NULL)) {
	183	pdata->cpu = cpu;
	184	break;
a06ae860 PP	185	}
a06ae860 PP	186	}
7f73b0b9	187	of_node_put(dn);
a06ae860 PP	188
	189	return pdata;
	190	}
	191	EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);