blob: 4f75bcdd243039de61e664534439f27bb07a53f7 [file] [log] [blame]
/* Copyright (c) 2013, 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/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/of_coresight.h>
#include <linux/coresight.h>
#include <linux/of.h>
#include "coresight-priv.h"
struct hwevent_mux {
phys_addr_t start;
phys_addr_t end;
};
struct hwevent_drvdata {
struct device *dev;
struct coresight_device *csdev;
struct clk *clk;
struct mutex mutex;
int nr_hclk;
struct clk **hclk;
int nr_hmux;
struct hwevent_mux *hmux;
bool enable;
};
static int hwevent_enable(struct hwevent_drvdata *drvdata)
{
int ret, i;
mutex_lock(&drvdata->mutex);
if (drvdata->enable)
goto out;
ret = clk_prepare_enable(drvdata->clk);
if (ret)
goto err0;
for (i = 0; i < drvdata->nr_hclk; i++) {
ret = clk_prepare_enable(drvdata->hclk[i]);
if (ret)
goto err1;
}
drvdata->enable = true;
dev_info(drvdata->dev, "Hardware Event driver enabled\n");
out:
mutex_unlock(&drvdata->mutex);
return 0;
err1:
clk_disable_unprepare(drvdata->clk);
for (i--; i >= 0; i--)
clk_disable_unprepare(drvdata->hclk[i]);
err0:
mutex_unlock(&drvdata->mutex);
return ret;
}
static void hwevent_disable(struct hwevent_drvdata *drvdata)
{
int i;
mutex_lock(&drvdata->mutex);
if (!drvdata->enable)
goto out;
drvdata->enable = false;
clk_disable_unprepare(drvdata->clk);
for (i = 0; i < drvdata->nr_hclk; i++)
clk_disable_unprepare(drvdata->hclk[i]);
dev_info(drvdata->dev, "Hardware Event driver disabled\n");
out:
mutex_unlock(&drvdata->mutex);
}
static ssize_t hwevent_show_enable(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val = drvdata->enable;
return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static ssize_t hwevent_store_enable(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val;
int ret = 0;
if (sscanf(buf, "%lx", &val) != 1)
return -EINVAL;
if (val)
ret = hwevent_enable(drvdata);
else
hwevent_disable(drvdata);
if (ret)
return ret;
return size;
}
static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, hwevent_show_enable,
hwevent_store_enable);
static ssize_t hwevent_store_setreg(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct hwevent_drvdata *drvdata = dev_get_drvdata(dev->parent);
void *hwereg;
unsigned long long addr;
unsigned long val;
int ret, i;
if (sscanf(buf, "%llx %lx", &addr, &val) != 2)
return -EINVAL;
mutex_lock(&drvdata->mutex);
if (!drvdata->enable) {
dev_err(dev, "Hardware Event driver not enabled\n");
ret = -EINVAL;
goto err;
}
for (i = 0; i < drvdata->nr_hmux; i++) {
if ((addr >= drvdata->hmux[i].start) &&
(addr < drvdata->hmux[i].end)) {
hwereg = devm_ioremap(dev,
drvdata->hmux[i].start,
drvdata->hmux[i].end -
drvdata->hmux[i].start);
if (!hwereg) {
dev_err(dev, "unable to map address 0x%llx\n",
addr);
ret = -ENOMEM;
goto err;
}
writel_relaxed(val, hwereg + addr -
drvdata->hmux[i].start);
/* Ensure writes to hwevent control registers
are completed before unmapping the address
*/
mb();
devm_iounmap(dev, hwereg);
break;
}
}
if (i == drvdata->nr_hmux) {
ret = coresight_csr_hwctrl_set(addr, val);
if (ret) {
dev_err(dev, "invalid mux control register address\n");
ret = -EINVAL;
goto err;
}
}
mutex_unlock(&drvdata->mutex);
return size;
err:
mutex_unlock(&drvdata->mutex);
return ret;
}
static DEVICE_ATTR(setreg, S_IWUSR, NULL, hwevent_store_setreg);
static struct attribute *hwevent_attrs[] = {
&dev_attr_enable.attr,
&dev_attr_setreg.attr,
NULL,
};
static struct attribute_group hwevent_attr_grp = {
.attrs = hwevent_attrs,
};
static const struct attribute_group *hwevent_attr_grps[] = {
&hwevent_attr_grp,
NULL,
};
static int __devinit hwevent_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct hwevent_drvdata *drvdata;
struct coresight_desc *desc;
struct coresight_platform_data *pdata;
struct resource *res;
int ret, i;
const char *hmux_name, *hclk_name;
if (coresight_fuse_access_disabled())
return -EPERM;
if (pdev->dev.of_node) {
pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
pdev->dev.platform_data = pdata;
}
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->dev = &pdev->dev;
platform_set_drvdata(pdev, drvdata);
if (pdev->dev.of_node)
drvdata->nr_hmux = of_property_count_strings(pdev->dev.of_node,
"reg-names");
if (drvdata->nr_hmux > 0) {
drvdata->hmux = devm_kzalloc(dev, drvdata->nr_hmux *
sizeof(*drvdata->hmux),
GFP_KERNEL);
if (!drvdata->hmux)
return -ENOMEM;
for (i = 0; i < drvdata->nr_hmux; i++) {
ret = of_property_read_string_index(pdev->dev.of_node,
"reg-names", i,
&hmux_name);
if (ret)
return ret;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
hmux_name);
if (!res)
return -ENODEV;
drvdata->hmux[i].start = res->start;
drvdata->hmux[i].end = res->end;
}
} else if (drvdata->nr_hmux < 0) {
return drvdata->nr_hmux;
} else {
/* return error if reg-names in dt node is empty string */
return -ENODEV;
}
mutex_init(&drvdata->mutex);
drvdata->clk = devm_clk_get(dev, "core_clk");
if (IS_ERR(drvdata->clk))
return PTR_ERR(drvdata->clk);
ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
if (ret)
return ret;
if (pdev->dev.of_node)
drvdata->nr_hclk = of_property_count_strings(pdev->dev.of_node,
"qcom,hwevent-clks");
if (drvdata->nr_hclk > 0) {
drvdata->hclk = devm_kzalloc(dev, drvdata->nr_hclk *
sizeof(*drvdata->hclk),
GFP_KERNEL);
if (!drvdata->hclk)
return -ENOMEM;
for (i = 0; i < drvdata->nr_hclk; i++) {
ret = of_property_read_string_index(pdev->dev.of_node,
"qcom,hwevent-clks",
i, &hclk_name);
if (ret)
return ret;
drvdata->hclk[i] = devm_clk_get(dev, hclk_name);
if (IS_ERR(drvdata->hclk[i]))
return PTR_ERR(drvdata->hclk[i]);
}
}
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
desc->type = CORESIGHT_DEV_TYPE_NONE;
desc->pdata = pdev->dev.platform_data;
desc->dev = &pdev->dev;
desc->groups = hwevent_attr_grps;
desc->owner = THIS_MODULE;
drvdata->csdev = coresight_register(desc);
if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);
dev_info(dev, "Hardware Event driver initialized\n");
return 0;
}
static int __devexit hwevent_remove(struct platform_device *pdev)
{
struct hwevent_drvdata *drvdata = platform_get_drvdata(pdev);
coresight_unregister(drvdata->csdev);
return 0;
}
static struct of_device_id hwevent_match[] = {
{.compatible = "qcom,coresight-hwevent"},
{}
};
static struct platform_driver hwevent_driver = {
.probe = hwevent_probe,
.remove = __devexit_p(hwevent_remove),
.driver = {
.name = "coresight-hwevent",
.owner = THIS_MODULE,
.of_match_table = hwevent_match,
},
};
static int __init hwevent_init(void)
{
return platform_driver_register(&hwevent_driver);
}
module_init(hwevent_init);
static void __exit hwevent_exit(void)
{
platform_driver_unregister(&hwevent_driver);
}
module_exit(hwevent_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Hardware Event driver");