/* Copyright (c) 2012, 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 <linux/module.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 <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-configuable 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; do { ep = of_graph_get_next_endpoint(node, ep); if (!ep) break; if (of_property_read_bool(ep, "slave-mode")) in++; else 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; 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); /* Use device name as sysfs handle */ pdata->name = dev_name(dev); /* 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.id; /* * 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; pdata->child_names[i] = dev_name(rdev); pdata->child_ports[i] = rendpoint.id; i++; } while (ep); } /* Affinity defaults to CPU0 */ pdata->cpu = 0; dn = of_parse_phandle(node, "cpu", 0); if (dn) { const u32 *cell; int len, index; u64 hwid; cell = of_get_property(dn, "reg", &len); if (cell) { hwid = of_read_number(cell, of_n_addr_cells(dn)); index = get_logical_index(hwid); if (index != -EINVAL) pdata->cpu = index; } } return pdata; } EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);