/* Copyright (c) 2012, 2016 The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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 void of_coresight_get_ports(struct device_node *node, int *nr_inport, int *nr_outport) { struct device_node *ep = NULL; int in = 0, out = 0; struct of_endpoint endpoint; do { ep = of_graph_get_next_endpoint(node, ep); if (!ep) break; if (of_graph_parse_endpoint(ep, &endpoint)) continue; if (of_property_read_bool(ep, "slave-mode")) 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 int of_coresight_alloc_memory(struct device *dev, struct coresight_platform_data *pdata) { /* List of output port on this component */ pdata->outports = devm_kzalloc(dev, pdata->nr_outport * sizeof(*pdata->outports), GFP_KERNEL); if (!pdata->outports) return -ENOMEM; /* Children connected to this component via @outports */ pdata->child_names = devm_kzalloc(dev, pdata->nr_outport * sizeof(*pdata->child_names), GFP_KERNEL); if (!pdata->child_names) return -ENOMEM; /* Port number on the child this component is connected to */ pdata->child_ports = devm_kzalloc(dev, pdata->nr_outport * sizeof(*pdata->child_ports), GFP_KERNEL); if (!pdata->child_ports) return -ENOMEM; return 0; } struct coresight_platform_data *of_get_coresight_platform_data( struct device *dev, struct device_node *node) { int i = 0, ret = 0, cpu; struct coresight_platform_data *pdata; struct of_endpoint endpoint, rendpoint; struct device *rdev; struct device_node *dn; struct device_node *ep = NULL; struct device_node *rparent = NULL; struct device_node *rport = NULL; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return ERR_PTR(-ENOMEM); ret = of_property_read_string(node, "coresight-name", &pdata->name); if (ret) return ERR_PTR(ret); /* Get the number of input and output port for this component */ of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport); if (pdata->nr_outport) { ret = of_coresight_alloc_memory(dev, pdata); if (ret) return ERR_PTR(ret); /* Iterate through each port to discover topology */ do { /* Get a handle on a port */ ep = of_graph_get_next_endpoint(node, ep); if (!ep) break; /* * No need to deal with input ports, processing for as * processing for output ports will deal with them. */ if (of_find_property(ep, "slave-mode", NULL)) continue; /* Get a handle on the local endpoint */ ret = of_graph_parse_endpoint(ep, &endpoint); if (ret) continue; /* The local out port number */ pdata->outports[i] = endpoint.port; /* * Get a handle on the remote port and parent * attached to it. */ rparent = of_graph_get_remote_port_parent(ep); rport = of_graph_get_remote_port(ep); if (!rparent || !rport) continue; if (of_graph_parse_endpoint(rport, &rendpoint)) continue; rdev = of_coresight_get_endpoint_device(rparent); if (!rdev) continue; ret = of_property_read_string(rparent, "coresight-name", &pdata->child_names[i]); if (ret) pdata->child_names[i] = dev_name(rdev); pdata->child_ports[i] = rendpoint.id; i++; } while (ep); } /* Affinity defaults to -1 (invalid) */ pdata->cpu = -1; dn = of_parse_phandle(node, "cpu", 0); for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) { if (dn == of_get_cpu_node(cpu, NULL)) { pdata->cpu = cpu; break; } } return pdata; } EXPORT_SYMBOL_GPL(of_get_coresight_platform_data); struct coresight_cti_data *of_get_coresight_cti_data( struct device *dev, struct device_node *node) { int i, ret; uint32_t ctis_len; struct device_node *child_node; struct coresight_cti_data *ctidata; ctidata = devm_kzalloc(dev, sizeof(*ctidata), GFP_KERNEL); if (!ctidata) return ERR_PTR(-ENOMEM); if (of_get_property(node, "coresight-ctis", &ctis_len)) ctidata->nr_ctis = ctis_len/sizeof(uint32_t); else return ERR_PTR(-EINVAL); if (ctidata->nr_ctis) { ctidata->names = devm_kzalloc(dev, ctidata->nr_ctis * sizeof(*ctidata->names), GFP_KERNEL); if (!ctidata->names) return ERR_PTR(-ENOMEM); for (i = 0; i < ctidata->nr_ctis; i++) { child_node = of_parse_phandle(node, "coresight-ctis", i); if (!child_node) return ERR_PTR(-EINVAL); ret = of_property_read_string(child_node, "coresight-name", &ctidata->names[i]); of_node_put(child_node); if (ret) return ERR_PTR(ret); } } return ctidata; } EXPORT_SYMBOL(of_get_coresight_cti_data);