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CoreSight components are compliant with the ARM CoreSight architecture specification and can be connected in various topologies to suit a particular SoC tracing needs. These trace components can generally be classified as sources, links and sinks. Trace data produced by one or more sources flows through the intermediate links connecting the source to the currently selected sink. The CoreSight framework provides an interface for the CoreSight trace drivers to register themselves with. It's intended to build up a topological view of the CoreSight components and configure the correct serie of components on user input via sysfs. For eg., when enabling a source, the framework builds up a path consisting of all the components connecting the source to the currently selected sink(s) and enables all of them. The framework also supports switching between available sinks and provides status information to user space applications through the debugfs interface. Signed-off-by: Pratik Patel <pratikp@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
205 lines
5.0 KiB
C
205 lines
5.0 KiB
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_graph.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/amba/bus.h>
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#include <linux/coresight.h>
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#include <asm/smp_plat.h>
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static int of_dev_node_match(struct device *dev, void *data)
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{
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return dev->of_node == data;
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}
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static struct device *
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of_coresight_get_endpoint_device(struct device_node *endpoint)
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{
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struct device *dev = NULL;
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/*
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* If we have a non-configuable replicator, it will be found on the
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* platform bus.
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*/
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dev = bus_find_device(&platform_bus_type, NULL,
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endpoint, of_dev_node_match);
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if (dev)
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return dev;
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/*
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* We have a configurable component - circle through the AMBA bus
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* looking for the device that matches the endpoint node.
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*/
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return bus_find_device(&amba_bustype, NULL,
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endpoint, of_dev_node_match);
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}
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static struct device_node *of_get_coresight_endpoint(
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const struct device_node *parent, struct device_node *prev)
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{
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struct device_node *node = of_graph_get_next_endpoint(parent, prev);
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of_node_put(prev);
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return node;
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}
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static void of_coresight_get_ports(struct device_node *node,
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int *nr_inport, int *nr_outport)
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{
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struct device_node *ep = NULL;
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int in = 0, out = 0;
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do {
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ep = of_get_coresight_endpoint(node, ep);
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if (!ep)
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break;
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if (of_property_read_bool(ep, "slave-mode"))
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in++;
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else
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out++;
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} while (ep);
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*nr_inport = in;
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*nr_outport = out;
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}
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static int of_coresight_alloc_memory(struct device *dev,
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struct coresight_platform_data *pdata)
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{
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/* List of output port on this component */
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pdata->outports = devm_kzalloc(dev, pdata->nr_outport *
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sizeof(*pdata->outports),
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GFP_KERNEL);
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if (!pdata->outports)
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return -ENOMEM;
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/* Children connected to this component via @outport */
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pdata->child_names = devm_kzalloc(dev, pdata->nr_outport *
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sizeof(*pdata->child_names),
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GFP_KERNEL);
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if (!pdata->child_names)
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return -ENOMEM;
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/* Port number on the child this component is connected to */
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pdata->child_ports = devm_kzalloc(dev, pdata->nr_outport *
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sizeof(*pdata->child_ports),
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GFP_KERNEL);
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if (!pdata->child_ports)
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return -ENOMEM;
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return 0;
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}
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struct coresight_platform_data *of_get_coresight_platform_data(
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struct device *dev, struct device_node *node)
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{
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int i = 0, ret = 0;
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struct coresight_platform_data *pdata;
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struct of_endpoint endpoint, rendpoint;
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struct device *rdev;
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struct device_node *cpu;
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struct device_node *ep = NULL;
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struct device_node *rparent = NULL;
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struct device_node *rport = NULL;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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/* Use device name as debugfs handle */
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pdata->name = dev_name(dev);
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/* Get the number of input and output port for this component */
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of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
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if (pdata->nr_outport) {
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ret = of_coresight_alloc_memory(dev, pdata);
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if (ret)
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return ERR_PTR(ret);
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/* Iterate through each port to discover topology */
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do {
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/* Get a handle on a port */
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ep = of_get_coresight_endpoint(node, ep);
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if (!ep)
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break;
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/*
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* No need to deal with input ports, processing for as
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* processing for output ports will deal with them.
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*/
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if (of_find_property(ep, "slave-mode", NULL))
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continue;
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/* Get a handle on the local endpoint */
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ret = of_graph_parse_endpoint(ep, &endpoint);
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if (ret)
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continue;
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/* The local out port number */
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pdata->outports[i] = endpoint.id;
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/*
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* Get a handle on the remote port and parent
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* attached to it.
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*/
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rparent = of_graph_get_remote_port_parent(ep);
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rport = of_graph_get_remote_port(ep);
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if (!rparent || !rport)
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continue;
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if (of_graph_parse_endpoint(rport, &rendpoint))
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continue;
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rdev = of_coresight_get_endpoint_device(rparent);
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if (!dev)
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continue;
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pdata->child_names[i] = dev_name(rdev);
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pdata->child_ports[i] = rendpoint.id;
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i++;
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} while (ep);
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}
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/* Affinity defaults to CPU0 */
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pdata->cpu = 0;
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cpu = of_parse_phandle(node, "cpu", 0);
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if (cpu) {
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const u32 *mpidr;
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int len, index;
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mpidr = of_get_property(cpu, "reg", &len);
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if (mpidr && len == 4) {
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index = get_logical_index(be32_to_cpup(mpidr));
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if (index != -EINVAL)
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pdata->cpu = index;
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}
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}
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return pdata;
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}
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EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
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