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![Rob Herring](/assets/img/avatar_default.png)
Convert string compares of DT node names to use of_node_name_eq helper instead. This removes direct access to the node name pointer. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
297 lines
7 KiB
C
297 lines
7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*/
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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 <linux/cpumask.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-configurable 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 inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
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{
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return of_property_read_bool(ep, "slave-mode");
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}
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static void of_coresight_get_ports_legacy(const 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_graph_get_next_endpoint(node, ep);
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if (!ep)
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break;
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if (of_coresight_legacy_ep_is_input(ep))
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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 struct device_node *of_coresight_get_port_parent(struct device_node *ep)
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{
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struct device_node *parent = of_graph_get_port_parent(ep);
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/*
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* Skip one-level up to the real device node, if we
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* are using the new bindings.
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*/
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if (of_node_name_eq(parent, "in-ports") ||
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of_node_name_eq(parent, "out-ports"))
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parent = of_get_next_parent(parent);
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return parent;
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}
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static inline struct device_node *
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of_coresight_get_input_ports_node(const struct device_node *node)
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{
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return of_get_child_by_name(node, "in-ports");
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}
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static inline struct device_node *
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of_coresight_get_output_ports_node(const struct device_node *node)
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{
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return of_get_child_by_name(node, "out-ports");
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}
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static inline int
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of_coresight_count_ports(struct device_node *port_parent)
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{
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int i = 0;
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struct device_node *ep = NULL;
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while ((ep = of_graph_get_next_endpoint(port_parent, ep)))
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i++;
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return i;
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}
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static void of_coresight_get_ports(const 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 *input_ports = NULL, *output_ports = NULL;
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input_ports = of_coresight_get_input_ports_node(node);
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output_ports = of_coresight_get_output_ports_node(node);
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if (input_ports || output_ports) {
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if (input_ports) {
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*nr_inport = of_coresight_count_ports(input_ports);
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of_node_put(input_ports);
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}
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if (output_ports) {
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*nr_outport = of_coresight_count_ports(output_ports);
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of_node_put(output_ports);
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}
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} else {
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/* Fall back to legacy DT bindings parsing */
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of_coresight_get_ports_legacy(node, nr_inport, nr_outport);
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}
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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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if (pdata->nr_outport) {
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pdata->conns = devm_kzalloc(dev, pdata->nr_outport *
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sizeof(*pdata->conns),
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GFP_KERNEL);
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if (!pdata->conns)
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return -ENOMEM;
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}
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return 0;
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}
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int of_coresight_get_cpu(const struct device_node *node)
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{
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int cpu;
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struct device_node *dn;
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dn = of_parse_phandle(node, "cpu", 0);
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/* Affinity defaults to CPU0 */
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if (!dn)
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return 0;
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cpu = of_cpu_node_to_id(dn);
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of_node_put(dn);
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/* Affinity to CPU0 if no cpu nodes are found */
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return (cpu < 0) ? 0 : cpu;
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}
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EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
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/*
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* of_coresight_parse_endpoint : Parse the given output endpoint @ep
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* and fill the connection information in @conn
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*
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* Parses the local port, remote device name and the remote port.
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*
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* Returns :
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* 1 - If the parsing is successful and a connection record
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* was created for an output connection.
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* 0 - If the parsing completed without any fatal errors.
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* -Errno - Fatal error, abort the scanning.
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*/
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static int of_coresight_parse_endpoint(struct device *dev,
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struct device_node *ep,
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struct coresight_connection *conn)
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{
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int ret = 0;
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struct of_endpoint endpoint, rendpoint;
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struct device_node *rparent = NULL;
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struct device_node *rep = NULL;
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struct device *rdev = NULL;
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do {
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/* Parse the local port details */
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if (of_graph_parse_endpoint(ep, &endpoint))
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break;
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/*
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* Get a handle on the remote endpoint and the device it is
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* attached to.
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*/
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rep = of_graph_get_remote_endpoint(ep);
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if (!rep)
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break;
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rparent = of_coresight_get_port_parent(rep);
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if (!rparent)
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break;
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if (of_graph_parse_endpoint(rep, &rendpoint))
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break;
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/* If the remote device is not available, defer probing */
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rdev = of_coresight_get_endpoint_device(rparent);
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if (!rdev) {
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ret = -EPROBE_DEFER;
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break;
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}
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conn->outport = endpoint.port;
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conn->child_name = devm_kstrdup(dev,
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dev_name(rdev),
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GFP_KERNEL);
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conn->child_port = rendpoint.port;
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/* Connection record updated */
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ret = 1;
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} while (0);
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of_node_put(rparent);
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of_node_put(rep);
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put_device(rdev);
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return ret;
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}
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struct coresight_platform_data *
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of_get_coresight_platform_data(struct device *dev,
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const struct device_node *node)
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{
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int ret = 0;
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struct coresight_platform_data *pdata;
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struct coresight_connection *conn;
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struct device_node *ep = NULL;
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const struct device_node *parent = NULL;
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bool legacy_binding = false;
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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 sysfs handle */
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pdata->name = dev_name(dev);
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pdata->cpu = of_coresight_get_cpu(node);
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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 there are no output connections, we are done */
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if (!pdata->nr_outport)
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return pdata;
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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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parent = of_coresight_get_output_ports_node(node);
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/*
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* If the DT uses obsoleted bindings, the ports are listed
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* under the device and we need to filter out the input
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* ports.
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*/
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if (!parent) {
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legacy_binding = true;
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parent = node;
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dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
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}
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conn = pdata->conns;
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/* Iterate through each output port to discover topology */
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while ((ep = of_graph_get_next_endpoint(parent, ep))) {
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/*
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* Legacy binding mixes input/output ports under the
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* same parent. So, skip the input ports if we are dealing
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* with legacy binding, as they processed with their
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* connected output ports.
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*/
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if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
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continue;
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ret = of_coresight_parse_endpoint(dev, ep, conn);
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switch (ret) {
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case 1:
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conn++; /* Fall through */
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case 0:
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break;
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default:
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return ERR_PTR(ret);
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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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