Merge tag 'char-misc-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver updates from Greg KH: "Here's the big char/misc driver patchset for 4.1-rc1. Lots of different driver subsystem updates here, nothing major, full details are in the shortlog. All of this has been in linux-next for a while" * tag 'char-misc-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (133 commits) mei: trace: remove unused TRACE_SYSTEM_STRING DTS: ARM: OMAP3-N900: Add lis3lv02d support Documentation: DT: lis302: update wakeup binding lis3lv02d: DT: add wakeup unit 2 and wakeup threshold lis3lv02d: DT: use s32 to support negative values Drivers: hv: hv_balloon: correctly handle num_pages>INT_MAX case Drivers: hv: hv_balloon: correctly handle val.freeram<num_pages case mei: replace check for connection instead of transitioning mei: use mei_cl_is_connected consistently mei: fix mei_poll operation hv_vmbus: Add gradually increased delay for retries in vmbus_post_msg() Drivers: hv: hv_balloon: survive ballooning request with num_pages=0 Drivers: hv: hv_balloon: eliminate jumps in piecewiese linear floor function Drivers: hv: hv_balloon: do not online pages in offline blocks hv: remove the per-channel workqueue hv: don't schedule new works in vmbus_onoffer()/vmbus_onoffer_rescind() hv: run non-blocking message handlers in the dispatch tasklet coresight: moving to new "hwtracing" directory coresight-tmc: Adding a status interface to sysfs coresight: remove the unnecessary configuration coresight-default-sink ...
This commit is contained in:
Linus Torvalds
191
drivers/hwtracing/coresight/of_coresight.c
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191
drivers/hwtracing/coresight/of_coresight.c
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/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.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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static int of_dev_node_match(struct device *dev, void *data)
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{
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return dev->of_node == data;
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}
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static struct device *
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of_coresight_get_endpoint_device(struct device_node *endpoint)
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{
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struct device *dev = NULL;
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/*
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* If we have a non-configuable 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(&platform_bus_type, NULL,
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endpoint, of_dev_node_match);
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if (dev)
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return dev;
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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(&amba_bustype, NULL,
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endpoint, of_dev_node_match);
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}
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static void of_coresight_get_ports(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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int in = 0, out = 0;
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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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if (of_property_read_bool(ep, "slave-mode"))
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in++;
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else
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out++;
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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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static int of_coresight_alloc_memory(struct device *dev,
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struct coresight_platform_data *pdata)
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{
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/* List of output port on this component */
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pdata->outports = devm_kzalloc(dev, pdata->nr_outport *
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sizeof(*pdata->outports),
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GFP_KERNEL);
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if (!pdata->outports)
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return -ENOMEM;
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/* Children connected to this component via @outports */
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pdata->child_names = devm_kzalloc(dev, pdata->nr_outport *
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sizeof(*pdata->child_names),
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GFP_KERNEL);
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if (!pdata->child_names)
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return -ENOMEM;
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/* Port number on the child this component is connected to */
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pdata->child_ports = devm_kzalloc(dev, pdata->nr_outport *
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sizeof(*pdata->child_ports),
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GFP_KERNEL);
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if (!pdata->child_ports)
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return -ENOMEM;
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return 0;
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}
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struct coresight_platform_data *of_get_coresight_platform_data(
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struct device *dev, struct device_node *node)
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{
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int i = 0, ret = 0, cpu;
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struct coresight_platform_data *pdata;
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struct of_endpoint endpoint, rendpoint;
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struct device *rdev;
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struct device_node *dn;
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struct device_node *ep = NULL;
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struct device_node *rparent = NULL;
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struct device_node *rport = NULL;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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/* Use device name as sysfs handle */
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pdata->name = dev_name(dev);
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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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if (pdata->nr_outport) {
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ret = of_coresight_alloc_memory(dev, pdata);
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if (ret)
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return ERR_PTR(ret);
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/* Iterate through each port to discover topology */
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do {
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/* Get a handle on a port */
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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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* No need to deal with input ports, processing for as
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* processing for output ports will deal with them.
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*/
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if (of_find_property(ep, "slave-mode", NULL))
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continue;
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/* Get a handle on the local endpoint */
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ret = of_graph_parse_endpoint(ep, &endpoint);
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if (ret)
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continue;
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/* The local out port number */
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pdata->outports[i] = endpoint.id;
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/*
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* Get a handle on the remote port and parent
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* attached to it.
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*/
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rparent = of_graph_get_remote_port_parent(ep);
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rport = of_graph_get_remote_port(ep);
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if (!rparent || !rport)
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continue;
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if (of_graph_parse_endpoint(rport, &rendpoint))
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continue;
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rdev = of_coresight_get_endpoint_device(rparent);
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if (!rdev)
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continue;
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pdata->child_names[i] = dev_name(rdev);
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pdata->child_ports[i] = rendpoint.id;
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i++;
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} while (ep);
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}
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/* Affinity defaults to CPU0 */
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pdata->cpu = 0;
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dn = of_parse_phandle(node, "cpu", 0);
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for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) {
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if (dn == of_get_cpu_node(cpu, NULL)) {
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pdata->cpu = cpu;
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break;
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}
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}
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return pdata;
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}
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EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
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