| /* Copyright (c) 2012, 2016-2017, 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/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 <linux/coresight-cti.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 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, 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) { |
| /* 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) |
| return ERR_PTR(-EPROBE_DEFER); |
| |
| 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 CPU0 */ |
| pdata->cpu = 0; |
| 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; |
| } |
| } |
| of_node_put(dn); |
| |
| 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); |