Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2012, The Linux Foundation. All rights reserved.
 */
 
#include <linux/acpi.h>
#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>
 
#include "coresight-priv.h"
/*
 * coresight_alloc_conns: Allocate connections record for each output
 * port from the device.
 */
static int coresight_alloc_conns(struct device *dev,
<------><------><------><------> struct coresight_platform_data *pdata)
{
<------>if (pdata->nr_outport) {
<------><------>pdata->conns = devm_kcalloc(dev, pdata->nr_outport,
<------><------><------><------><------>    sizeof(*pdata->conns), GFP_KERNEL);
<------><------>if (!pdata->conns)
<------><------><------>return -ENOMEM;
<------>}
 
<------>return 0;
}
 
static struct device *
coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
{
<------>struct device *dev = NULL;
 
<------>/*
<------> * If we have a non-configurable replicator, it will be found on the
<------> * platform bus.
<------> */
<------>dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
<------>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_by_fwnode(&amba_bustype, fwnode);
}
 
/*
 * Find a registered coresight device from a device fwnode.
 * The node info is associated with the AMBA parent, but the
 * csdev keeps a copy so iterate round the coresight bus to
 * find the device.
 */
struct coresight_device *
coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode)
{
<------>struct device *dev;
<------>struct coresight_device *csdev = NULL;
 
<------>dev = bus_find_device_by_fwnode(&coresight_bustype, r_fwnode);
<------>if (dev) {
<------><------>csdev = to_coresight_device(dev);
<------><------>put_device(dev);
<------>}
<------>return csdev;
}
EXPORT_SYMBOL_GPL(coresight_find_csdev_by_fwnode);
 
#ifdef CONFIG_OF
static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep)
{
<------>return of_property_read_bool(ep, "slave-mode");
}
 
static void of_coresight_get_ports_legacy(const struct device_node *node,
<------><------><------><------><------>  int *nr_inport, int *nr_outport)
{
<------>struct device_node *ep = NULL;
<------>struct of_endpoint endpoint;
<------>int in = 0, out = 0;
 
<------>/*
<------> * Avoid warnings in of_graph_get_next_endpoint()
<------> * if the device doesn't have any graph connections
<------> */
<------>if (!of_graph_is_present(node))
<------><------>return;
<------>do {
<------><------>ep = of_graph_get_next_endpoint(node, ep);
<------><------>if (!ep)
<------><------><------>break;
 
<------><------>if (of_graph_parse_endpoint(ep, &endpoint))
<------><------><------>continue;
 
<------><------>if (of_coresight_legacy_ep_is_input(ep)) {
<------><------><------>in = (endpoint.port + 1 > in) ?
<------><------><------><------>endpoint.port + 1 : in;
<------><------>} else {
<------><------><------>out = (endpoint.port + 1) > out ?
<------><------><------><------>endpoint.port + 1 : out;
<------><------>}
 
<------>} while (ep);
 
<------>*nr_inport = in;
<------>*nr_outport = out;
}
 
static struct device_node *of_coresight_get_port_parent(struct device_node *ep)
{
<------>struct device_node *parent = of_graph_get_port_parent(ep);
 
<------>/*
<------> * Skip one-level up to the real device node, if we
<------> * are using the new bindings.
<------> */
<------>if (of_node_name_eq(parent, "in-ports") ||
<------>    of_node_name_eq(parent, "out-ports"))
<------><------>parent = of_get_next_parent(parent);
 
<------>return parent;
}
 
static inline struct device_node *
of_coresight_get_input_ports_node(const struct device_node *node)
{
<------>return of_get_child_by_name(node, "in-ports");
}
 
static inline struct device_node *
of_coresight_get_output_ports_node(const struct device_node *node)
{
<------>return of_get_child_by_name(node, "out-ports");
}
 
static inline int
of_coresight_count_ports(struct device_node *port_parent)
{
<------>int i = 0;
<------>struct device_node *ep = NULL;
<------>struct of_endpoint endpoint;
 
<------>while ((ep = of_graph_get_next_endpoint(port_parent, ep))) {
<------><------>/* Defer error handling to parsing */
<------><------>if (of_graph_parse_endpoint(ep, &endpoint))
<------><------><------>continue;
<------><------>if (endpoint.port + 1 > i)
<------><------><------>i = endpoint.port + 1;
<------>}
 
<------>return i;
}
 
static void of_coresight_get_ports(const struct device_node *node,
<------><------><------><------>   int *nr_inport, int *nr_outport)
{
<------>struct device_node *input_ports = NULL, *output_ports = NULL;
 
<------>input_ports = of_coresight_get_input_ports_node(node);
<------>output_ports = of_coresight_get_output_ports_node(node);
 
<------>if (input_ports || output_ports) {
<------><------>if (input_ports) {
<------><------><------>*nr_inport = of_coresight_count_ports(input_ports);
<------><------><------>of_node_put(input_ports);
<------><------>}
<------><------>if (output_ports) {
<------><------><------>*nr_outport = of_coresight_count_ports(output_ports);
<------><------><------>of_node_put(output_ports);
<------><------>}
<------>} else {
<------><------>/* Fall back to legacy DT bindings parsing */
<------><------>of_coresight_get_ports_legacy(node, nr_inport, nr_outport);
<------>}
}
 
static int of_coresight_get_cpu(struct device *dev)
{
<------>int cpu;
<------>struct device_node *dn;
 
<------>if (!dev->of_node)
<------><------>return -ENODEV;
 
<------>dn = of_parse_phandle(dev->of_node, "cpu", 0);
<------>if (!dn)
<------><------>return -ENODEV;
 
<------>cpu = of_cpu_node_to_id(dn);
<------>of_node_put(dn);
 
<------>return cpu;
}
 
/*
 * of_coresight_parse_endpoint : Parse the given output endpoint @ep
 * and fill the connection information in @conn
 *
 * Parses the local port, remote device name and the remote port.
 *
 * Returns :
 *	 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 ret = 0;
<------>struct of_endpoint endpoint, rendpoint;
<------>struct device_node *rparent = NULL;
<------>struct device_node *rep = NULL;
<------>struct device *rdev = NULL;
<------>struct fwnode_handle *rdev_fwnode;
<------>struct coresight_connection *conn;
 
<------>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_coresight_get_port_parent(rep);
<------><------>if (!rparent)
<------><------><------>break;
<------><------>if (of_graph_parse_endpoint(rep, &rendpoint))
<------><------><------>break;
 
<------><------>rdev_fwnode = of_fwnode_handle(rparent);
<------><------>/* If the remote device is not available, defer probing */
<------><------>rdev = coresight_find_device_by_fwnode(rdev_fwnode);
<------><------>if (!rdev) {
<------><------><------>ret = -EPROBE_DEFER;
<------><------><------>break;
<------><------>}
 
<------><------>conn = &pdata->conns[endpoint.port];
<------><------>if (conn->child_fwnode) {
<------><------><------>dev_warn(dev, "Duplicate output port %d\n",
<------><------><------><------> endpoint.port);
<------><------><------>ret = -EINVAL;
<------><------><------>break;
<------><------>}
<------><------>conn->outport = endpoint.port;
<------><------>/*
<------><------> * 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(rdev_fwnode);
<------><------>conn->child_port = rendpoint.port;
<------><------>/* Connection record updated */
<------>} while (0);
 
<------>of_node_put(rparent);
<------>of_node_put(rep);
<------>put_device(rdev);
 
<------>return ret;
}
 
static int of_get_coresight_platform_data(struct device *dev,
<------><------><------><------><------>  struct coresight_platform_data *pdata)
{
<------>int ret = 0;
<------>struct device_node *ep = NULL;
<------>const struct device_node *parent = NULL;
<------>bool legacy_binding = false;
<------>struct device_node *node = dev->of_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 0;
 
<------>ret = coresight_alloc_conns(dev, pdata);
<------>if (ret)
<------><------>return ret;
 
<------>parent = of_coresight_get_output_ports_node(node);
<------>/*
<------> * If the DT uses obsoleted bindings, the ports are listed
<------> * under the device and we need to filter out the input
<------> * ports.
<------> */
<------>if (!parent) {
<------><------>legacy_binding = true;
<------><------>parent = node;
<------><------>dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n");
<------>}
 
<------>/* Iterate through each output port to discover topology */
<------>while ((ep = of_graph_get_next_endpoint(parent, ep))) {
<------><------>/*
<------><------> * Legacy binding mixes input/output ports under the
<------><------> * same parent. So, skip the input ports if we are dealing
<------><------> * with legacy binding, as they processed with their
<------><------> * connected output ports.
<------><------> */
<------><------>if (legacy_binding && of_coresight_legacy_ep_is_input(ep))
<------><------><------>continue;
 
<------><------>ret = of_coresight_parse_endpoint(dev, ep, pdata);
<------><------>if (ret)
<------><------><------>return ret;
<------>}
 
<------>return 0;
}
#else
static inline int
of_get_coresight_platform_data(struct device *dev,
<------><------><------>       struct coresight_platform_data *pdata)
{
<------>return -ENOENT;
}
 
static inline int of_coresight_get_cpu(struct device *dev)
{
<------>return -ENODEV;
}
#endif
 
#ifdef CONFIG_ACPI
 
#include <acpi/actypes.h>
#include <acpi/processor.h>
 
/* ACPI Graph _DSD UUID : "ab02a46b-74c7-45a2-bd68-f7d344ef2153" */
static const guid_t acpi_graph_uuid = GUID_INIT(0xab02a46b, 0x74c7, 0x45a2,
<------><------><------><------><------><------>0xbd, 0x68, 0xf7, 0xd3,
<------><------><------><------><------><------>0x44, 0xef, 0x21, 0x53);
/* Coresight ACPI Graph UUID : "3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd" */
static const guid_t coresight_graph_uuid = GUID_INIT(0x3ecbc8b6, 0x1d0e, 0x4fb3,
<------><------><------><------><------><------>     0x81, 0x07, 0xe6, 0x27,
<------><------><------><------><------><------>     0xf8, 0x05, 0xc6, 0xcd);
#define ACPI_CORESIGHT_LINK_SLAVE	0
#define ACPI_CORESIGHT_LINK_MASTER	1
 
static inline bool is_acpi_guid(const union acpi_object *obj)
{
<------>return (obj->type == ACPI_TYPE_BUFFER) && (obj->buffer.length == 16);
}
 
/*
 * acpi_guid_matches	- Checks if the given object is a GUID object and
 * that it matches the supplied the GUID.
 */
static inline bool acpi_guid_matches(const union acpi_object *obj,
<------><------><------><------>   const guid_t *guid)
{
<------>return is_acpi_guid(obj) &&
<------>       guid_equal((guid_t *)obj->buffer.pointer, guid);
}
 
static inline bool is_acpi_dsd_graph_guid(const union acpi_object *obj)
{
<------>return acpi_guid_matches(obj, &acpi_graph_uuid);
}
 
static inline bool is_acpi_coresight_graph_guid(const union acpi_object *obj)
{
<------>return acpi_guid_matches(obj, &coresight_graph_uuid);
}
 
static inline bool is_acpi_coresight_graph(const union acpi_object *obj)
{
<------>const union acpi_object *graphid, *guid, *links;
 
<------>if (obj->type != ACPI_TYPE_PACKAGE ||
<------>    obj->package.count < 3)
<------><------>return false;
 
<------>graphid = &obj->package.elements[0];
<------>guid = &obj->package.elements[1];
<------>links = &obj->package.elements[2];
 
<------>if (graphid->type != ACPI_TYPE_INTEGER ||
<------>    links->type != ACPI_TYPE_INTEGER)
<------><------>return false;
 
<------>return is_acpi_coresight_graph_guid(guid);
}
 
/*
 * acpi_validate_dsd_graph	- Make sure the given _DSD graph conforms
 * to the ACPI _DSD Graph specification.
 *
 * ACPI Devices Graph property has the following format:
 *  {
 *	Revision	- Integer, must be 0
 *	NumberOfGraphs	- Integer, N indicating the following list.
 *	Graph[1],
 *	 ...
 *	Graph[N]
 *  }
 *
 * And each Graph entry has the following format:
 *  {
 *	GraphID		- Integer, identifying a graph the device belongs to.
 *	UUID		- UUID identifying the specification that governs
 *			  this graph. (e.g, see is_acpi_coresight_graph())
 *	NumberOfLinks	- Number "N" of connections on this node of the graph.
 *	Links[1]
 *	...
 *	Links[N]
 *  }
 *
 * Where each "Links" entry has the following format:
 *
 * {
 *	SourcePortAddress	- Integer
 *	DestinationPortAddress	- Integer
 *	DestinationDeviceName	- Reference to another device
 *	( --- CoreSight specific extensions below ---)
 *	DirectionOfFlow		- Integer 1 for output(master)
 *				  0 for input(slave)
 * }
 *
 * e.g:
 * For a Funnel device
 *
 * 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 rc, 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;
 
<------>rc = acpi_bus_get_device(fields[2].reference.handle, &r_adev);
<------>if (rc)
<------><------>return rc;
 
<------>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);