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869 lines
22 KiB
869 lines
22 KiB
// 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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|
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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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|
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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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|
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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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/* |
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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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/* |
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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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/* |
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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/* |
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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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|
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return parent; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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#ifdef CONFIG_ACPI |
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|
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#include <acpi/actypes.h> |
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#include <acpi/processor.h> |
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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return is_acpi_coresight_graph_guid(guid); |
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} |
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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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* |
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* Device(MFUN) { |
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* ... |
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* |
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* Name (_DSD, Package() { |
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* // DSD Package contains tuples of { Proeprty_Type_UUID, Package() } |
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* ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), //Std. Property UUID |
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* Package() { |
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* Package(2) { "property-name", <property-value> } |
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* }, |
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* |
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* ToUUID("ab02a46b-74c7-45a2-bd68-f7d344ef2153"), // ACPI Graph UUID |
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* Package() { |
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* 0, // Revision |
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* 1, // NumberOfGraphs. |
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* Package() { // Graph[0] Package |
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* 1, // GraphID |
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* // Coresight Graph UUID |
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* ToUUID("3ecbc8b6-1d0e-4fb3-8107-e627f805c6cd"), |
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* 3, // NumberOfLinks aka ports |
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* // Link[0]: Output_0 -> Replicator:Input_0 |
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* Package () { 0, 0, \_SB_.RPL0, 1 }, |
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* // Link[1]: Input_0 <- Cluster0_Funnel0:Output_0 |
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* Package () { 0, 0, \_SB_.CLU0.FUN0, 0 }, |
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* // Link[2]: Input_1 <- Cluster1_Funnel0:Output_0 |
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* Package () { 1, 0, \_SB_.CLU1.FUN0, 0 }, |
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* } // End of Graph[0] Package |
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* |
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* }, // End of ACPI Graph Property |
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* }) |
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*/ |
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static inline bool acpi_validate_dsd_graph(const union acpi_object *graph) |
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{ |
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int i, n; |
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const union acpi_object *rev, *nr_graphs; |
|
|
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/* The graph must contain at least the Revision and Number of Graphs */ |
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if (graph->package.count < 2) |
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return false; |
|
|
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rev = &graph->package.elements[0]; |
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nr_graphs = &graph->package.elements[1]; |
|
|
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if (rev->type != ACPI_TYPE_INTEGER || |
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nr_graphs->type != ACPI_TYPE_INTEGER) |
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return false; |
|
|
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/* We only support revision 0 */ |
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if (rev->integer.value != 0) |
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return false; |
|
|
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n = nr_graphs->integer.value; |
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/* CoreSight devices are only part of a single Graph */ |
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if (n != 1) |
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return false; |
|
|
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/* Make sure the ACPI graph package has right number of elements */ |
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if (graph->package.count != (n + 2)) |
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return false; |
|
|
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/* |
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* Each entry must be a graph package with at least 3 members : |
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* { GraphID, UUID, NumberOfLinks(n), Links[.],... } |
|
*/ |
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for (i = 2; i < n + 2; i++) { |
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const union acpi_object *obj = &graph->package.elements[i]; |
|
|
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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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return true; |
|
} |
|
|
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/* acpi_get_dsd_graph - Find the _DSD Graph property for the given device. */ |
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static const union acpi_object * |
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acpi_get_dsd_graph(struct acpi_device *adev) |
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{ |
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int i; |
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struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; |
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acpi_status status; |
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const union acpi_object *dsd; |
|
|
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status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, |
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&buf, ACPI_TYPE_PACKAGE); |
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if (ACPI_FAILURE(status)) |
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return NULL; |
|
|
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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) { |
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const union acpi_object *guid, *package; |
|
|
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guid = &dsd->package.elements[i]; |
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package = &dsd->package.elements[i + 1]; |
|
|
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/* All _DSD elements must have a UUID and a Package */ |
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if (!is_acpi_guid(guid) || package->type != ACPI_TYPE_PACKAGE) |
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break; |
|
/* Skip the non-Graph _DSD packages */ |
|
if (!is_acpi_dsd_graph_guid(guid)) |
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continue; |
|
if (acpi_validate_dsd_graph(package)) |
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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);
|
|
|