coresight: moving to new "hwtracing" directory

Keeping drivers related to HW tracing on ARM, i.e coresight,
under "drivers/coresight" doesn't make sense when other
architectures start rolling out technologies of the same
nature.

As such creating a new "drivers/hwtracing" directory where all
drivers of the same kind can reside, reducing namespace
pollution under "drivers/".

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 720 deletions

diff --git a/drivers/coresight/coresight.c b/drivers/coresight/coresight.c
deleted file mode 100644
index 894531d315b8..000000000000
--- a/drivers/coresight/coresight.c
+++ /dev/null
@@ -1,720 +0,0 @@
-/* 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/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/err.h>
-#include <linux/export.h>
-#include <linux/slab.h>
-#include <linux/mutex.h>
-#include <linux/clk.h>
-#include <linux/coresight.h>
-#include <linux/of_platform.h>
-#include <linux/delay.h>
-
-#include "coresight-priv.h"
-
-static DEFINE_MUTEX(coresight_mutex);
-
-static int coresight_id_match(struct device *dev, void *data)
-{
-	int trace_id, i_trace_id;
-	struct coresight_device *csdev, *i_csdev;
-
-	csdev = data;
-	i_csdev = to_coresight_device(dev);
-
-	/*
-	 * No need to care about oneself and components that are not
-	 * sources or not enabled
-	 */
-	if (i_csdev == csdev || !i_csdev->enable ||
-	    i_csdev->type != CORESIGHT_DEV_TYPE_SOURCE)
-		return 0;
-
-	/* Get the source ID for both compoment */
-	trace_id = source_ops(csdev)->trace_id(csdev);
-	i_trace_id = source_ops(i_csdev)->trace_id(i_csdev);
-
-	/* All you need is one */
-	if (trace_id == i_trace_id)
-		return 1;
-
-	return 0;
-}
-
-static int coresight_source_is_unique(struct coresight_device *csdev)
-{
-	int trace_id = source_ops(csdev)->trace_id(csdev);
-
-	/* this shouldn't happen */
-	if (trace_id < 0)
-		return 0;
-
-	return !bus_for_each_dev(&coresight_bustype, NULL,
-				 csdev, coresight_id_match);
-}
-
-static int coresight_find_link_inport(struct coresight_device *csdev)
-{
-	int i;
-	struct coresight_device *parent;
-	struct coresight_connection *conn;
-
-	parent = container_of(csdev->path_link.next,
-			      struct coresight_device, path_link);
-
-	for (i = 0; i < parent->nr_outport; i++) {
-		conn = &parent->conns[i];
-		if (conn->child_dev == csdev)
-			return conn->child_port;
-	}
-
-	dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n",
-		dev_name(&parent->dev), dev_name(&csdev->dev));
-
-	return 0;
-}
-
-static int coresight_find_link_outport(struct coresight_device *csdev)
-{
-	int i;
-	struct coresight_device *child;
-	struct coresight_connection *conn;
-
-	child = container_of(csdev->path_link.prev,
-			     struct coresight_device, path_link);
-
-	for (i = 0; i < csdev->nr_outport; i++) {
-		conn = &csdev->conns[i];
-		if (conn->child_dev == child)
-			return conn->outport;
-	}
-
-	dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n",
-		dev_name(&csdev->dev), dev_name(&child->dev));
-
-	return 0;
-}
-
-static int coresight_enable_sink(struct coresight_device *csdev)
-{
-	int ret;
-
-	if (!csdev->enable) {
-		if (sink_ops(csdev)->enable) {
-			ret = sink_ops(csdev)->enable(csdev);
-			if (ret)
-				return ret;
-		}
-		csdev->enable = true;
-	}
-
-	atomic_inc(csdev->refcnt);
-
-	return 0;
-}
-
-static void coresight_disable_sink(struct coresight_device *csdev)
-{
-	if (atomic_dec_return(csdev->refcnt) == 0) {
-		if (sink_ops(csdev)->disable) {
-			sink_ops(csdev)->disable(csdev);
-			csdev->enable = false;
-		}
-	}
-}
-
-static int coresight_enable_link(struct coresight_device *csdev)
-{
-	int ret;
-	int link_subtype;
-	int refport, inport, outport;
-
-	inport = coresight_find_link_inport(csdev);
-	outport = coresight_find_link_outport(csdev);
-	link_subtype = csdev->subtype.link_subtype;
-
-	if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
-		refport = inport;
-	else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
-		refport = outport;
-	else
-		refport = 0;
-
-	if (atomic_inc_return(&csdev->refcnt[refport]) == 1) {
-		if (link_ops(csdev)->enable) {
-			ret = link_ops(csdev)->enable(csdev, inport, outport);
-			if (ret)
-				return ret;
-		}
-	}
-
-	csdev->enable = true;
-
-	return 0;
-}
-
-static void coresight_disable_link(struct coresight_device *csdev)
-{
-	int i, nr_conns;
-	int link_subtype;
-	int refport, inport, outport;
-
-	inport = coresight_find_link_inport(csdev);
-	outport = coresight_find_link_outport(csdev);
-	link_subtype = csdev->subtype.link_subtype;
-
-	if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
-		refport = inport;
-		nr_conns = csdev->nr_inport;
-	} else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
-		refport = outport;
-		nr_conns = csdev->nr_outport;
-	} else {
-		refport = 0;
-		nr_conns = 1;
-	}
-
-	if (atomic_dec_return(&csdev->refcnt[refport]) == 0) {
-		if (link_ops(csdev)->disable)
-			link_ops(csdev)->disable(csdev, inport, outport);
-	}
-
-	for (i = 0; i < nr_conns; i++)
-		if (atomic_read(&csdev->refcnt[i]) != 0)
-			return;
-
-	csdev->enable = false;
-}
-
-static int coresight_enable_source(struct coresight_device *csdev)
-{
-	int ret;
-
-	if (!coresight_source_is_unique(csdev)) {
-		dev_warn(&csdev->dev, "traceID %d not unique\n",
-			 source_ops(csdev)->trace_id(csdev));
-		return -EINVAL;
-	}
-
-	if (!csdev->enable) {
-		if (source_ops(csdev)->enable) {
-			ret = source_ops(csdev)->enable(csdev);
-			if (ret)
-				return ret;
-		}
-		csdev->enable = true;
-	}
-
-	atomic_inc(csdev->refcnt);
-
-	return 0;
-}
-
-static void coresight_disable_source(struct coresight_device *csdev)
-{
-	if (atomic_dec_return(csdev->refcnt) == 0) {
-		if (source_ops(csdev)->disable) {
-			source_ops(csdev)->disable(csdev);
-			csdev->enable = false;
-		}
-	}
-}
-
-static int coresight_enable_path(struct list_head *path)
-{
-	int ret = 0;
-	struct coresight_device *cd;
-
-	list_for_each_entry(cd, path, path_link) {
-		if (cd == list_first_entry(path, struct coresight_device,
-					   path_link)) {
-			ret = coresight_enable_sink(cd);
-		} else if (list_is_last(&cd->path_link, path)) {
-			/*
-			 * Don't enable the source just yet - this needs to
-			 * happen at the very end when all links and sink
-			 * along the path have been configured properly.
-			 */
-			;
-		} else {
-			ret = coresight_enable_link(cd);
-		}
-		if (ret)
-			goto err;
-	}
-
-	return 0;
-err:
-	list_for_each_entry_continue_reverse(cd, path, path_link) {
-		if (cd == list_first_entry(path, struct coresight_device,
-					   path_link)) {
-			coresight_disable_sink(cd);
-		} else if (list_is_last(&cd->path_link, path)) {
-			;
-		} else {
-			coresight_disable_link(cd);
-		}
-	}
-
-	return ret;
-}
-
-static int coresight_disable_path(struct list_head *path)
-{
-	struct coresight_device *cd;
-
-	list_for_each_entry_reverse(cd, path, path_link) {
-		if (cd == list_first_entry(path, struct coresight_device,
-					   path_link)) {
-			coresight_disable_sink(cd);
-		} else if (list_is_last(&cd->path_link, path)) {
-			/*
-			 * The source has already been stopped, no need
-			 * to do it again here.
-			 */
-			;
-		} else {
-			coresight_disable_link(cd);
-		}
-	}
-
-	return 0;
-}
-
-static int coresight_build_paths(struct coresight_device *csdev,
-				 struct list_head *path,
-				 bool enable)
-{
-	int i, ret = -EINVAL;
-	struct coresight_connection *conn;
-
-	list_add(&csdev->path_link, path);
-
-	if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
-	    csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) &&
-	    csdev->activated) {
-		if (enable)
-			ret = coresight_enable_path(path);
-		else
-			ret = coresight_disable_path(path);
-	} else {
-		for (i = 0; i < csdev->nr_outport; i++) {
-			conn = &csdev->conns[i];
-			if (coresight_build_paths(conn->child_dev,
-						    path, enable) == 0)
-				ret = 0;
-		}
-	}
-
-	if (list_first_entry(path, struct coresight_device, path_link) != csdev)
-		dev_err(&csdev->dev, "wrong device in %s\n", __func__);
-
-	list_del(&csdev->path_link);
-
-	return ret;
-}
-
-int coresight_enable(struct coresight_device *csdev)
-{
-	int ret = 0;
-	LIST_HEAD(path);
-
-	mutex_lock(&coresight_mutex);
-	if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) {
-		ret = -EINVAL;
-		dev_err(&csdev->dev, "wrong device type in %s\n", __func__);
-		goto out;
-	}
-	if (csdev->enable)
-		goto out;
-
-	if (coresight_build_paths(csdev, &path, true)) {
-		dev_err(&csdev->dev, "building path(s) failed\n");
-		goto out;
-	}
-
-	if (coresight_enable_source(csdev))
-		dev_err(&csdev->dev, "source enable failed\n");
-out:
-	mutex_unlock(&coresight_mutex);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(coresight_enable);
-
-void coresight_disable(struct coresight_device *csdev)
-{
-	LIST_HEAD(path);
-
-	mutex_lock(&coresight_mutex);
-	if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) {
-		dev_err(&csdev->dev, "wrong device type in %s\n", __func__);
-		goto out;
-	}
-	if (!csdev->enable)
-		goto out;
-
-	coresight_disable_source(csdev);
-	if (coresight_build_paths(csdev, &path, false))
-		dev_err(&csdev->dev, "releasing path(s) failed\n");
-
-out:
-	mutex_unlock(&coresight_mutex);
-}
-EXPORT_SYMBOL_GPL(coresight_disable);
-
-static ssize_t enable_sink_show(struct device *dev,
-				struct device_attribute *attr, char *buf)
-{
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	return scnprintf(buf, PAGE_SIZE, "%u\n", (unsigned)csdev->activated);
-}
-
-static ssize_t enable_sink_store(struct device *dev,
-				 struct device_attribute *attr,
-				 const char *buf, size_t size)
-{
-	int ret;
-	unsigned long val;
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	ret = kstrtoul(buf, 10, &val);
-	if (ret)
-		return ret;
-
-	if (val)
-		csdev->activated = true;
-	else
-		csdev->activated = false;
-
-	return size;
-
-}
-static DEVICE_ATTR_RW(enable_sink);
-
-static ssize_t enable_source_show(struct device *dev,
-				  struct device_attribute *attr, char *buf)
-{
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	return scnprintf(buf, PAGE_SIZE, "%u\n", (unsigned)csdev->enable);
-}
-
-static ssize_t enable_source_store(struct device *dev,
-				   struct device_attribute *attr,
-				   const char *buf, size_t size)
-{
-	int ret = 0;
-	unsigned long val;
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	ret = kstrtoul(buf, 10, &val);
-	if (ret)
-		return ret;
-
-	if (val) {
-		ret = coresight_enable(csdev);
-		if (ret)
-			return ret;
-	} else {
-		coresight_disable(csdev);
-	}
-
-	return size;
-}
-static DEVICE_ATTR_RW(enable_source);
-
-static struct attribute *coresight_sink_attrs[] = {
-	&dev_attr_enable_sink.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(coresight_sink);
-
-static struct attribute *coresight_source_attrs[] = {
-	&dev_attr_enable_source.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(coresight_source);
-
-static struct device_type coresight_dev_type[] = {
-	{
-		.name = "none",
-	},
-	{
-		.name = "sink",
-		.groups = coresight_sink_groups,
-	},
-	{
-		.name = "link",
-	},
-	{
-		.name = "linksink",
-		.groups = coresight_sink_groups,
-	},
-	{
-		.name = "source",
-		.groups = coresight_source_groups,
-	},
-};
-
-static void coresight_device_release(struct device *dev)
-{
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	kfree(csdev);
-}
-
-static int coresight_orphan_match(struct device *dev, void *data)
-{
-	int i;
-	bool still_orphan = false;
-	struct coresight_device *csdev, *i_csdev;
-	struct coresight_connection *conn;
-
-	csdev = data;
-	i_csdev = to_coresight_device(dev);
-
-	/* No need to check oneself */
-	if (csdev == i_csdev)
-		return 0;
-
-	/* Move on to another component if no connection is orphan */
-	if (!i_csdev->orphan)
-		return 0;
-	/*
-	 * Circle throuch all the connection of that component.  If we find
-	 * an orphan connection whose name matches @csdev, link it.
-	 */
-	for (i = 0; i < i_csdev->nr_outport; i++) {
-		conn = &i_csdev->conns[i];
-
-		/* We have found at least one orphan connection */
-		if (conn->child_dev == NULL) {
-			/* Does it match this newly added device? */
-			if (!strcmp(dev_name(&csdev->dev), conn->child_name)) {
-				conn->child_dev = csdev;
-			} else {
-				/* This component still has an orphan */
-				still_orphan = true;
-			}
-		}
-	}
-
-	i_csdev->orphan = still_orphan;
-
-	/*
-	 * Returning '0' ensures that all known component on the
-	 * bus will be checked.
-	 */
-	return 0;
-}
-
-static void coresight_fixup_orphan_conns(struct coresight_device *csdev)
-{
-	/*
-	 * No need to check for a return value as orphan connection(s)
-	 * are hooked-up with each newly added component.
-	 */
-	bus_for_each_dev(&coresight_bustype, NULL,
-				 csdev, coresight_orphan_match);
-}
-
-
-static int coresight_name_match(struct device *dev, void *data)
-{
-	char *to_match;
-	struct coresight_device *i_csdev;
-
-	to_match = data;
-	i_csdev = to_coresight_device(dev);
-
-	if (!strcmp(to_match, dev_name(&i_csdev->dev)))
-		return 1;
-
-	return 0;
-}
-
-static void coresight_fixup_device_conns(struct coresight_device *csdev)
-{
-	int i;
-	struct device *dev = NULL;
-	struct coresight_connection *conn;
-
-	for (i = 0; i < csdev->nr_outport; i++) {
-		conn = &csdev->conns[i];
-		dev = bus_find_device(&coresight_bustype, NULL,
-				      (void *)conn->child_name,
-				      coresight_name_match);
-
-		if (dev) {
-			conn->child_dev = to_coresight_device(dev);
-		} else {
-			csdev->orphan = true;
-			conn->child_dev = NULL;
-		}
-	}
-}
-
-/**
- * coresight_timeout - loop until a bit has changed to a specific state.
- * @addr: base address of the area of interest.
- * @offset: address of a register, starting from @addr.
- * @position: the position of the bit of interest.
- * @value: the value the bit should have.
- *
- * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
- * TIMEOUT_US has elapsed, which ever happens first.
- */
-
-int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
-{
-	int i;
-	u32 val;
-
-	for (i = TIMEOUT_US; i > 0; i--) {
-		val = __raw_readl(addr + offset);
-		/* waiting on the bit to go from 0 to 1 */
-		if (value) {
-			if (val & BIT(position))
-				return 0;
-		/* waiting on the bit to go from 1 to 0 */
-		} else {
-			if (!(val & BIT(position)))
-				return 0;
-		}
-
-		/*
-		 * Delay is arbitrary - the specification doesn't say how long
-		 * we are expected to wait.  Extra check required to make sure
-		 * we don't wait needlessly on the last iteration.
-		 */
-		if (i - 1)
-			udelay(1);
-	}
-
-	return -EAGAIN;
-}
-
-struct bus_type coresight_bustype = {
-	.name	= "coresight",
-};
-
-static int __init coresight_init(void)
-{
-	return bus_register(&coresight_bustype);
-}
-postcore_initcall(coresight_init);
-
-struct coresight_device *coresight_register(struct coresight_desc *desc)
-{
-	int i;
-	int ret;
-	int link_subtype;
-	int nr_refcnts = 1;
-	atomic_t *refcnts = NULL;
-	struct coresight_device *csdev;
-	struct coresight_connection *conns;
-
-	csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
-	if (!csdev) {
-		ret = -ENOMEM;
-		goto err_kzalloc_csdev;
-	}
-
-	if (desc->type == CORESIGHT_DEV_TYPE_LINK ||
-	    desc->type == CORESIGHT_DEV_TYPE_LINKSINK) {
-		link_subtype = desc->subtype.link_subtype;
-
-		if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
-			nr_refcnts = desc->pdata->nr_inport;
-		else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
-			nr_refcnts = desc->pdata->nr_outport;
-	}
-
-	refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL);
-	if (!refcnts) {
-		ret = -ENOMEM;
-		goto err_kzalloc_refcnts;
-	}
-
-	csdev->refcnt = refcnts;
-
-	csdev->nr_inport = desc->pdata->nr_inport;
-	csdev->nr_outport = desc->pdata->nr_outport;
-	conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL);
-	if (!conns) {
-		ret = -ENOMEM;
-		goto err_kzalloc_conns;
-	}
-
-	for (i = 0; i < csdev->nr_outport; i++) {
-		conns[i].outport = desc->pdata->outports[i];
-		conns[i].child_name = desc->pdata->child_names[i];
-		conns[i].child_port = desc->pdata->child_ports[i];
-	}
-
-	csdev->conns = conns;
-
-	csdev->type = desc->type;
-	csdev->subtype = desc->subtype;
-	csdev->ops = desc->ops;
-	csdev->orphan = false;
-
-	csdev->dev.type = &coresight_dev_type[desc->type];
-	csdev->dev.groups = desc->groups;
-	csdev->dev.parent = desc->dev;
-	csdev->dev.release = coresight_device_release;
-	csdev->dev.bus = &coresight_bustype;
-	dev_set_name(&csdev->dev, "%s", desc->pdata->name);
-
-	ret = device_register(&csdev->dev);
-	if (ret)
-		goto err_device_register;
-
-	mutex_lock(&coresight_mutex);
-
-	coresight_fixup_device_conns(csdev);
-	coresight_fixup_orphan_conns(csdev);
-
-	mutex_unlock(&coresight_mutex);
-
-	return csdev;
-
-err_device_register:
-	kfree(conns);
-err_kzalloc_conns:
-	kfree(refcnts);
-err_kzalloc_refcnts:
-	kfree(csdev);
-err_kzalloc_csdev:
-	return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(coresight_register);
-
-void coresight_unregister(struct coresight_device *csdev)
-{
-	mutex_lock(&coresight_mutex);
-
-	kfree(csdev->conns);
-	device_unregister(&csdev->dev);
-
-	mutex_unlock(&coresight_mutex);
-}
-EXPORT_SYMBOL_GPL(coresight_unregister);
-
-MODULE_LICENSE("GPL v2");