192 lines
4.7 KiB
C
192 lines
4.7 KiB
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);
|