870 lines
22 KiB
C
870 lines
22 KiB
C
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// 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/acpi.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 <linux/cpumask.h>
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#include <asm/smp_plat.h>
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#include "coresight-priv.h"
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/*
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* coresight_alloc_conns: Allocate connections record for each output
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* port from the device.
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*/
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static int coresight_alloc_conns(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_kcalloc(dev, pdata->nr_outport,
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sizeof(*pdata->conns), 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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static struct device *
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coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
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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_by_fwnode(&platform_bus_type, fwnode);
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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_by_fwnode(&amba_bustype, fwnode);
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}
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/*
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* Find a registered coresight device from a device fwnode.
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* The node info is associated with the AMBA parent, but the
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* csdev keeps a copy so iterate round the coresight bus to
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* find the device.
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*/
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struct coresight_device *
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coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode)
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{
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struct device *dev;
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struct coresight_device *csdev = NULL;
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dev = bus_find_device_by_fwnode(&coresight_bustype, r_fwnode);
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if (dev) {
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csdev = to_coresight_device(dev);
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put_device(dev);
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}
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return csdev;
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}
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EXPORT_SYMBOL_GPL(coresight_find_csdev_by_fwnode);
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#ifdef CONFIG_OF
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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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struct of_endpoint endpoint;
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int in = 0, out = 0;
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/*
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* Avoid warnings in of_graph_get_next_endpoint()
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* if the device doesn't have any graph connections
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*/
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if (!of_graph_is_present(node))
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return;
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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_graph_parse_endpoint(ep, &endpoint))
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continue;
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if (of_coresight_legacy_ep_is_input(ep)) {
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in = (endpoint.port + 1 > in) ?
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endpoint.port + 1 : in;
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} else {
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out = (endpoint.port + 1) > out ?
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endpoint.port + 1 : out;
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}
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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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struct of_endpoint endpoint;
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while ((ep = of_graph_get_next_endpoint(port_parent, ep))) {
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/* Defer error handling to parsing */
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if (of_graph_parse_endpoint(ep, &endpoint))
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continue;
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if (endpoint.port + 1 > i)
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i = endpoint.port + 1;
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}
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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_get_cpu(struct device *dev)
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{
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int cpu;
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struct device_node *dn;
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if (!dev->of_node)
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return -ENODEV;
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dn = of_parse_phandle(dev->of_node, "cpu", 0);
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if (!dn)
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return -ENODEV;
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cpu = of_cpu_node_to_id(dn);
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of_node_put(dn);
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return cpu;
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}
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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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* 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_platform_data *pdata)
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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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struct fwnode_handle *rdev_fwnode;
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struct coresight_connection *conn;
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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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rdev_fwnode = of_fwnode_handle(rparent);
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/* If the remote device is not available, defer probing */
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rdev = coresight_find_device_by_fwnode(rdev_fwnode);
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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 = &pdata->conns[endpoint.port];
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if (conn->child_fwnode) {
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dev_warn(dev, "Duplicate output port %d\n",
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endpoint.port);
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ret = -EINVAL;
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break;
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}
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conn->outport = endpoint.port;
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/*
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* Hold the refcount to the target device. This could be
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* released via:
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* 1) coresight_release_platform_data() if the probe fails or
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* this device is unregistered.
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* 2) While removing the target device via
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* coresight_remove_match()
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*/
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conn->child_fwnode = fwnode_handle_get(rdev_fwnode);
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conn->child_port = rendpoint.port;
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/* Connection record updated */
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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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static int of_get_coresight_platform_data(struct device *dev,
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struct coresight_platform_data *pdata)
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{
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int ret = 0;
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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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struct device_node *node = dev->of_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 0;
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ret = coresight_alloc_conns(dev, pdata);
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if (ret)
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return 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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/* 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, pdata);
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if (ret)
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return ret;
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}
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return 0;
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}
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#else
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static inline int
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of_get_coresight_platform_data(struct device *dev,
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struct coresight_platform_data *pdata)
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{
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return -ENOENT;
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}
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static inline int of_coresight_get_cpu(struct device *dev)
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{
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return -ENODEV;
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}
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#endif
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#ifdef CONFIG_ACPI
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#include <acpi/actypes.h>
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#include <acpi/processor.h>
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/* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
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static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
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0xbd, 0x68, 0xf7, 0xd3,
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0x44, 0xef, 0x21, 0x53);
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/* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
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static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
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0x81, 0x07, 0xe6, 0x27,
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0xf8, 0x05, 0xc6, 0xcd);
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#define ACPI_CORESIGHT_LINK_SLAVE 0
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#define ACPI_CORESIGHT_LINK_MASTER 1
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static inline bool is_acpi_guid(const union acpi_object *obj)
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{
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return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
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}
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/*
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* acpi_guid_matches - Checks if the given object is a GUID object and
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* that it matches the supplied the GUID.
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*/
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static inline bool acpi_guid_matches(const union acpi_object *obj,
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const guid_t *guid)
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{
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return is_acpi_guid(obj) &&
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guid_equal((guid_t *)obj->buffer.pointer, guid);
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}
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static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
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{
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return acpi_guid_matches(obj, &acpi_graph_uuid);
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}
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static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
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{
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return acpi_guid_matches(obj, &coresight_graph_uuid);
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}
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static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
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{
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const union acpi_object *graphid, *guid, *links;
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if (obj->type != ACPI_TYPE_PACKAGE ||
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obj->package.count < 3)
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return false;
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graphid = &obj->package.elements[0];
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guid = &obj->package.elements[1];
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links = &obj->package.elements[2];
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if (graphid->type != ACPI_TYPE_INTEGER ||
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links->type != ACPI_TYPE_INTEGER)
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return false;
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return is_acpi_coresight_graph_guid(guid);
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}
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/*
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* acpi_validate_dsd_graph - Make sure the given _DSD graph conforms
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* to the ACPI _DSD Graph specification.
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*
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* ACPI Devices Graph property has the following format:
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* {
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* Revision - Integer, must be 0
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* NumberOfGraphs - Integer, N indicating the following list.
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* Graph[1],
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* ...
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* Graph[N]
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* }
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*
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* And each Graph entry has the following format:
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* {
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* GraphID - Integer, identifying a graph the device belongs to.
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* UUID - UUID identifying the specification that governs
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* this graph. (e.g, see is_acpi_coresight_graph())
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* NumberOfLinks - Number "N" of connections on this node of the graph.
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* Links[1]
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* ...
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* Links[N]
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* }
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*
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* Where each "Links" entry has the following format:
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*
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* {
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* SourcePortAddress - Integer
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* DestinationPortAddress - Integer
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* DestinationDeviceName - Reference to another device
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* ( --- CoreSight specific extensions below ---)
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* DirectionOfFlow - Integer 1 for output(master)
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* 0 for input(slave)
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* }
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*
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* e.g:
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* For a Funnel device
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*
|
||
|
* Device(MFUN) {
|
||
|
* ...
|
||
|
*
|
||
|
* Name (_DSD, Package() {
|
||
|
* // DSD Package contains tuples of { Proeprty_Type_UUID, Package() }
|
||
|
* ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID
|
||
|
* Package() {
|
||
|
* Package(2) { "property-name", <property-value> }
|
||
|
* },
|
||
|
*
|
||
|
* ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID
|
||
|
* Package() {
|
||
|
* 0, // Revision
|
||
|
* 1, // NumberOfGraphs.
|
||
|
* Package() { // Graph[0] Package
|
||
|
* 1, // GraphID
|
||
|
* // Coresight Graph UUID
|
||
|
* ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"),
|
||
|
* 3, // NumberOfLinks aka ports
|
||
|
* // Link[0]: Output_0 -> Replicator:Input_0
|
||
|
* Package () { 0, 0, \_SB_.RPL0, 1 },
|
||
|
* // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0
|
||
|
* Package () { 0, 0, \_SB_.CLU0.FUN0, 0 },
|
||
|
* // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0
|
||
|
* Package () { 1, 0, \_SB_.CLU1.FUN0, 0 },
|
||
|
* } // End of Graph[0] Package
|
||
|
*
|
||
|
* }, // End of ACPI Graph Property
|
||
|
* })
|
||
|
*/
|
||
|
static inline bool acpi_validate_dsd_graph(const union acpi_object *graph)
|
||
|
{
|
||
|
int i, n;
|
||
|
const union acpi_object *rev, *nr_graphs;
|
||
|
|
||
|
/* The graph must contain at least the Revision and Number of Graphs */
|
||
|
if (graph->package.count < 2)
|
||
|
return false;
|
||
|
|
||
|
rev = &graph->package.elements[0];
|
||
|
nr_graphs = &graph->package.elements[1];
|
||
|
|
||
|
if (rev->type != ACPI_TYPE_INTEGER ||
|
||
|
nr_graphs->type != ACPI_TYPE_INTEGER)
|
||
|
return false;
|
||
|
|
||
|
/* We only support revision 0 */
|
||
|
if (rev->integer.value != 0)
|
||
|
return false;
|
||
|
|
||
|
n = nr_graphs->integer.value;
|
||
|
/* CoreSight devices are only part of a single Graph */
|
||
|
if (n != 1)
|
||
|
return false;
|
||
|
|
||
|
/* Make sure the ACPI graph package has right number of elements */
|
||
|
if (graph->package.count != (n + 2))
|
||
|
return false;
|
||
|
|
||
|
/*
|
||
|
* Each entry must be a graph package with at least 3 members :
|
||
|
* { GraphID, UUID, NumberOfLinks(n), Links[.],... }
|
||
|
*/
|
||
|
for (i = 2; i < n + 2; i++) {
|
||
|
const union acpi_object *obj = &graph->package.elements[i];
|
||
|
|
||
|
if (obj->type != ACPI_TYPE_PACKAGE ||
|
||
|
obj->package.count < 3)
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
/* acpi_get_dsd_graph - Find the _DSD Graph property for the given device. */
|
||
|
static const union acpi_object *
|
||
|
acpi_get_dsd_graph(struct acpi_device *adev)
|
||
|
{
|
||
|
int i;
|
||
|
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
|
||
|
acpi_status status;
|
||
|
const union acpi_object *dsd;
|
||
|
|
||
|
status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL,
|
||
|
&buf, ACPI_TYPE_PACKAGE);
|
||
|
if (ACPI_FAILURE(status))
|
||
|
return NULL;
|
||
|
|
||
|
dsd = buf.pointer;
|
||
|
|
||
|
/*
|
||
|
* _DSD property consists tuples { Prop_UUID, Package() }
|
||
|
* Iterate through all the packages and find the Graph.
|
||
|
*/
|
||
|
for (i = 0; i + 1 < dsd->package.count; i += 2) {
|
||
|
const union acpi_object *guid, *package;
|
||
|
|
||
|
guid = &dsd->package.elements[i];
|
||
|
package = &dsd->package.elements[i + 1];
|
||
|
|
||
|
/* All _DSD elements must have a UUID and a Package */
|
||
|
if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE)
|
||
|
break;
|
||
|
/* Skip the non-Graph _DSD packages */
|
||
|
if (!is_acpi_dsd_graph_guid(guid))
|
||
|
continue;
|
||
|
if (acpi_validate_dsd_graph(package))
|
||
|
return package;
|
||
|
/* Invalid graph format, continue */
|
||
|
dev_warn(&adev->dev, "Invalid Graph _DSD property\n");
|
||
|
}
|
||
|
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
static inline bool
|
||
|
acpi_validate_coresight_graph(const union acpi_object *cs_graph)
|
||
|
{
|
||
|
int nlinks;
|
||
|
|
||
|
nlinks = cs_graph->package.elements[2].integer.value;
|
||
|
/*
|
||
|
* Graph must have the following fields :
|
||
|
* { GraphID, GraphUUID, NumberOfLinks, Links... }
|
||
|
*/
|
||
|
if (cs_graph->package.count != (nlinks + 3))
|
||
|
return false;
|
||
|
/* The links are validated in acpi_coresight_parse_link() */
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* acpi_get_coresight_graph - Parse the device _DSD tables and find
|
||
|
* the Graph property matching the CoreSight Graphs.
|
||
|
*
|
||
|
* Returns the pointer to the CoreSight Graph Package when found. Otherwise
|
||
|
* returns NULL.
|
||
|
*/
|
||
|
static const union acpi_object *
|
||
|
acpi_get_coresight_graph(struct acpi_device *adev)
|
||
|
{
|
||
|
const union acpi_object *graph_list, *graph;
|
||
|
int i, nr_graphs;
|
||
|
|
||
|
graph_list = acpi_get_dsd_graph(adev);
|
||
|
if (!graph_list)
|
||
|
return graph_list;
|
||
|
|
||
|
nr_graphs = graph_list->package.elements[1].integer.value;
|
||
|
|
||
|
for (i = 2; i < nr_graphs + 2; i++) {
|
||
|
graph = &graph_list->package.elements[i];
|
||
|
if (!is_acpi_coresight_graph(graph))
|
||
|
continue;
|
||
|
if (acpi_validate_coresight_graph(graph))
|
||
|
return graph;
|
||
|
/* Invalid graph format */
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* acpi_coresight_parse_link - Parse the given Graph connection
|
||
|
* of the device and populate the coresight_connection for an output
|
||
|
* connection.
|
||
|
*
|
||
|
* CoreSight Graph specification mandates that the direction of the data
|
||
|
* flow must be specified in the link. i.e,
|
||
|
*
|
||
|
* SourcePortAddress, // Integer
|
||
|
* DestinationPortAddress, // Integer
|
||
|
* DestinationDeviceName, // Reference to another device
|
||
|
* DirectionOfFlow, // 1 for output(master), 0 for input(slave)
|
||
|
*
|
||
|
* Returns the direction of the data flow [ Input(slave) or Output(master) ]
|
||
|
* upon success.
|
||
|
* Returns an negative error number otherwise.
|
||
|
*/
|
||
|
static int acpi_coresight_parse_link(struct acpi_device *adev,
|
||
|
const union acpi_object *link,
|
||
|
struct coresight_connection *conn)
|
||
|
{
|
||
|
int dir;
|
||
|
const union acpi_object *fields;
|
||
|
struct acpi_device *r_adev;
|
||
|
struct device *rdev;
|
||
|
|
||
|
if (link->type != ACPI_TYPE_PACKAGE ||
|
||
|
link->package.count != 4)
|
||
|
return -EINVAL;
|
||
|
|
||
|
fields = link->package.elements;
|
||
|
|
||
|
if (fields[0].type != ACPI_TYPE_INTEGER ||
|
||
|
fields[1].type != ACPI_TYPE_INTEGER ||
|
||
|
fields[2].type != ACPI_TYPE_LOCAL_REFERENCE ||
|
||
|
fields[3].type != ACPI_TYPE_INTEGER)
|
||
|
return -EINVAL;
|
||
|
|
||
|
r_adev = acpi_fetch_acpi_dev(fields[2].reference.handle);
|
||
|
if (!r_adev)
|
||
|
return -ENODEV;
|
||
|
|
||
|
dir = fields[3].integer.value;
|
||
|
if (dir == ACPI_CORESIGHT_LINK_MASTER) {
|
||
|
conn->outport = fields[0].integer.value;
|
||
|
conn->child_port = fields[1].integer.value;
|
||
|
rdev = coresight_find_device_by_fwnode(&r_adev->fwnode);
|
||
|
if (!rdev)
|
||
|
return -EPROBE_DEFER;
|
||
|
/*
|
||
|
* Hold the refcount to the target device. This could be
|
||
|
* released via:
|
||
|
* 1) coresight_release_platform_data() if the probe fails or
|
||
|
* this device is unregistered.
|
||
|
* 2) While removing the target device via
|
||
|
* coresight_remove_match().
|
||
|
*/
|
||
|
conn->child_fwnode = fwnode_handle_get(&r_adev->fwnode);
|
||
|
} else if (dir == ACPI_CORESIGHT_LINK_SLAVE) {
|
||
|
/*
|
||
|
* We are only interested in the port number
|
||
|
* for the input ports at this component.
|
||
|
* Store the port number in child_port.
|
||
|
*/
|
||
|
conn->child_port = fields[0].integer.value;
|
||
|
} else {
|
||
|
/* Invalid direction */
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
return dir;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* acpi_coresight_parse_graph - Parse the _DSD CoreSight graph
|
||
|
* connection information and populate the supplied coresight_platform_data
|
||
|
* instance.
|
||
|
*/
|
||
|
static int acpi_coresight_parse_graph(struct acpi_device *adev,
|
||
|
struct coresight_platform_data *pdata)
|
||
|
{
|
||
|
int rc, i, nlinks;
|
||
|
const union acpi_object *graph;
|
||
|
struct coresight_connection *conns, *ptr;
|
||
|
|
||
|
pdata->nr_inport = pdata->nr_outport = 0;
|
||
|
graph = acpi_get_coresight_graph(adev);
|
||
|
if (!graph)
|
||
|
return -ENOENT;
|
||
|
|
||
|
nlinks = graph->package.elements[2].integer.value;
|
||
|
if (!nlinks)
|
||
|
return 0;
|
||
|
|
||
|
/*
|
||
|
* To avoid scanning the table twice (once for finding the number of
|
||
|
* output links and then later for parsing the output links),
|
||
|
* cache the links information in one go and then later copy
|
||
|
* it to the pdata.
|
||
|
*/
|
||
|
conns = devm_kcalloc(&adev->dev, nlinks, sizeof(*conns), GFP_KERNEL);
|
||
|
if (!conns)
|
||
|
return -ENOMEM;
|
||
|
ptr = conns;
|
||
|
for (i = 0; i < nlinks; i++) {
|
||
|
const union acpi_object *link = &graph->package.elements[3 + i];
|
||
|
int dir;
|
||
|
|
||
|
dir = acpi_coresight_parse_link(adev, link, ptr);
|
||
|
if (dir < 0)
|
||
|
return dir;
|
||
|
|
||
|
if (dir == ACPI_CORESIGHT_LINK_MASTER) {
|
||
|
if (ptr->outport >= pdata->nr_outport)
|
||
|
pdata->nr_outport = ptr->outport + 1;
|
||
|
ptr++;
|
||
|
} else {
|
||
|
WARN_ON(pdata->nr_inport == ptr->child_port + 1);
|
||
|
/*
|
||
|
* We do not track input port connections for a device.
|
||
|
* However we need the highest port number described,
|
||
|
* which can be recorded now and reuse this connection
|
||
|
* record for an output connection. Hence, do not move
|
||
|
* the ptr for input connections
|
||
|
*/
|
||
|
if (ptr->child_port >= pdata->nr_inport)
|
||
|
pdata->nr_inport = ptr->child_port + 1;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
rc = coresight_alloc_conns(&adev->dev, pdata);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
|
||
|
/* Copy the connection information to the final location */
|
||
|
for (i = 0; conns + i < ptr; i++) {
|
||
|
int port = conns[i].outport;
|
||
|
|
||
|
/* Duplicate output port */
|
||
|
WARN_ON(pdata->conns[port].child_fwnode);
|
||
|
pdata->conns[port] = conns[i];
|
||
|
}
|
||
|
|
||
|
devm_kfree(&adev->dev, conns);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* acpi_handle_to_logical_cpuid - Map a given acpi_handle to the
|
||
|
* logical CPU id of the corresponding CPU device.
|
||
|
*
|
||
|
* Returns the logical CPU id when found. Otherwise returns >= nr_cpus_id.
|
||
|
*/
|
||
|
static int
|
||
|
acpi_handle_to_logical_cpuid(acpi_handle handle)
|
||
|
{
|
||
|
int i;
|
||
|
struct acpi_processor *pr;
|
||
|
|
||
|
for_each_possible_cpu(i) {
|
||
|
pr = per_cpu(processors, i);
|
||
|
if (pr && pr->handle == handle)
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
return i;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* acpi_coresigh_get_cpu - Find the logical CPU id of the CPU associated
|
||
|
* with this coresight device. With ACPI bindings, the CoreSight components
|
||
|
* are listed as child device of the associated CPU.
|
||
|
*
|
||
|
* Returns the logical CPU id when found. Otherwise returns 0.
|
||
|
*/
|
||
|
static int acpi_coresight_get_cpu(struct device *dev)
|
||
|
{
|
||
|
int cpu;
|
||
|
acpi_handle cpu_handle;
|
||
|
acpi_status status;
|
||
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
||
|
|
||
|
if (!adev)
|
||
|
return -ENODEV;
|
||
|
status = acpi_get_parent(adev->handle, &cpu_handle);
|
||
|
if (ACPI_FAILURE(status))
|
||
|
return -ENODEV;
|
||
|
|
||
|
cpu = acpi_handle_to_logical_cpuid(cpu_handle);
|
||
|
if (cpu >= nr_cpu_ids)
|
||
|
return -ENODEV;
|
||
|
return cpu;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
acpi_get_coresight_platform_data(struct device *dev,
|
||
|
struct coresight_platform_data *pdata)
|
||
|
{
|
||
|
struct acpi_device *adev;
|
||
|
|
||
|
adev = ACPI_COMPANION(dev);
|
||
|
if (!adev)
|
||
|
return -EINVAL;
|
||
|
|
||
|
return acpi_coresight_parse_graph(adev, pdata);
|
||
|
}
|
||
|
|
||
|
#else
|
||
|
|
||
|
static inline int
|
||
|
acpi_get_coresight_platform_data(struct device *dev,
|
||
|
struct coresight_platform_data *pdata)
|
||
|
{
|
||
|
return -ENOENT;
|
||
|
}
|
||
|
|
||
|
static inline int acpi_coresight_get_cpu(struct device *dev)
|
||
|
{
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
int coresight_get_cpu(struct device *dev)
|
||
|
{
|
||
|
if (is_of_node(dev->fwnode))
|
||
|
return of_coresight_get_cpu(dev);
|
||
|
else if (is_acpi_device_node(dev->fwnode))
|
||
|
return acpi_coresight_get_cpu(dev);
|
||
|
return 0;
|
||
|
}
|
||
|
EXPORT_SYMBOL_GPL(coresight_get_cpu);
|
||
|
|
||
|
struct coresight_platform_data *
|
||
|
coresight_get_platform_data(struct device *dev)
|
||
|
{
|
||
|
int ret = -ENOENT;
|
||
|
struct coresight_platform_data *pdata = NULL;
|
||
|
struct fwnode_handle *fwnode = dev_fwnode(dev);
|
||
|
|
||
|
if (IS_ERR_OR_NULL(fwnode))
|
||
|
goto error;
|
||
|
|
||
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
|
||
|
if (!pdata) {
|
||
|
ret = -ENOMEM;
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
if (is_of_node(fwnode))
|
||
|
ret = of_get_coresight_platform_data(dev, pdata);
|
||
|
else if (is_acpi_device_node(fwnode))
|
||
|
ret = acpi_get_coresight_platform_data(dev, pdata);
|
||
|
|
||
|
if (!ret)
|
||
|
return pdata;
|
||
|
error:
|
||
|
if (!IS_ERR_OR_NULL(pdata))
|
||
|
/* Cleanup the connection information */
|
||
|
coresight_release_platform_data(NULL, pdata);
|
||
|
return ERR_PTR(ret);
|
||
|
}
|
||
|
EXPORT_SYMBOL_GPL(coresight_get_platform_data);
|