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/* 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/module.h>
#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 <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-configuable 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 struct device_node *of_get_coresight_endpoint(
const struct device_node *parent, struct device_node *prev)
{
struct device_node *node = of_graph_get_next_endpoint(parent, prev);
of_node_put(prev);
return node;
}
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_get_coresight_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;
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_get_coresight_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)
continue;
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);
if (dn) {
const u32 *cell;
int len, index;
u64 hwid;
cell = of_get_property(dn, "reg", &len);
if (cell) {
hwid = of_read_number(cell, of_n_addr_cells(dn));
index = get_logical_index(hwid);
if (index != -EINVAL)
pdata->cpu = index;
}
}
return pdata;
}
EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
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