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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2012, 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>
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 inline bool of_coresight_ep_is_input(struct device_node *ep)
{
return of_property_read_bool(ep, "slave-mode");
}
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;
do {
ep = of_graph_get_next_endpoint(node, ep);
if (!ep)
break;
if (of_coresight_ep_is_input(ep))
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_kcalloc(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_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 CPU0 */
if (!dn)
return 0;
cpu = of_cpu_node_to_id(dn);
of_node_put(dn);
/* Affinity to CPU0 if no cpu nodes are found */
return (cpu < 0) ? 0 : cpu;
}
EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
/*
* 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;
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;
pdata->child_names[i] = devm_kstrdup(dev,
dev_name(rdev),
GFP_KERNEL);
pdata->child_ports[i] = rendpoint.port;
/* 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);
/* 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_coresight_ep_is_input(ep))
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);
}
}
return pdata;
}
EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
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