| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2012, The Linux Foundation. All rights reserved. |
| */ |
| |
| #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> |
| |
| |
| static int of_dev_node_match(struct device *dev, void *data) |
| { |
| return dev->of_node == data; |
| } |
| |
| static struct device * |
| of_coresight_get_endpoint_device(struct device_node *endpoint) |
| { |
| struct device *dev = NULL; |
| |
| /* |
| * If we have a non-configurable replicator, it will be found on the |
| * platform bus. |
| */ |
| dev = bus_find_device(&platform_bus_type, NULL, |
| endpoint, of_dev_node_match); |
| 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(&amba_bustype, NULL, |
| endpoint, of_dev_node_match); |
| } |
| |
| 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; |
| int in = 0, out = 0; |
| |
| do { |
| ep = of_graph_get_next_endpoint(node, ep); |
| if (!ep) |
| break; |
| |
| if (of_coresight_legacy_ep_is_input(ep)) |
| in++; |
| else |
| 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; |
| |
| while ((ep = of_graph_get_next_endpoint(port_parent, ep))) |
| i++; |
| 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_alloc_memory(struct device *dev, |
| struct coresight_platform_data *pdata) |
| { |
| if (pdata->nr_outport) { |
| pdata->conns = devm_kzalloc(dev, pdata->nr_outport * |
| sizeof(*pdata->conns), |
| GFP_KERNEL); |
| if (!pdata->conns) |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| int of_coresight_get_cpu(const struct device_node *node) |
| { |
| int cpu; |
| struct device_node *dn; |
| |
| dn = of_parse_phandle(node, "cpu", 0); |
| /* Affinity defaults to CPU0 */ |
| if (!dn) |
| return 0; |
| cpu = of_cpu_node_to_id(dn); |
| of_node_put(dn); |
| |
| /* Affinity to CPU0 if no cpu nodes are found */ |
| return (cpu < 0) ? 0 : cpu; |
| } |
| EXPORT_SYMBOL_GPL(of_coresight_get_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 : |
| * 1 - If the parsing is successful and a connection record |
| * was created for an output connection. |
| * 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_connection *conn) |
| { |
| int ret = 0; |
| struct of_endpoint endpoint, rendpoint; |
| struct device_node *rparent = NULL; |
| struct device_node *rep = NULL; |
| struct device *rdev = NULL; |
| |
| 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; |
| |
| /* If the remote device is not available, defer probing */ |
| rdev = of_coresight_get_endpoint_device(rparent); |
| if (!rdev) { |
| ret = -EPROBE_DEFER; |
| break; |
| } |
| |
| conn->outport = endpoint.port; |
| conn->child_name = devm_kstrdup(dev, |
| dev_name(rdev), |
| GFP_KERNEL); |
| conn->child_port = rendpoint.port; |
| /* Connection record updated */ |
| ret = 1; |
| } while (0); |
| |
| of_node_put(rparent); |
| of_node_put(rep); |
| put_device(rdev); |
| |
| return ret; |
| } |
| |
| struct coresight_platform_data * |
| of_get_coresight_platform_data(struct device *dev, |
| const struct device_node *node) |
| { |
| int ret = 0; |
| struct coresight_platform_data *pdata; |
| struct coresight_connection *conn; |
| struct device_node *ep = NULL; |
| const struct device_node *parent = NULL; |
| bool legacy_binding = false; |
| |
| pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
| if (!pdata) |
| return ERR_PTR(-ENOMEM); |
| |
| /* Use device name as sysfs handle */ |
| pdata->name = dev_name(dev); |
| pdata->cpu = of_coresight_get_cpu(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 pdata; |
| |
| ret = of_coresight_alloc_memory(dev, pdata); |
| if (ret) |
| return ERR_PTR(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"); |
| } |
| |
| conn = pdata->conns; |
| |
| /* 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, conn); |
| switch (ret) { |
| case 1: |
| conn++; /* Fall through */ |
| case 0: |
| break; |
| default: |
| return ERR_PTR(ret); |
| } |
| } |
| |
| return pdata; |
| } |
| EXPORT_SYMBOL_GPL(of_get_coresight_platform_data); |