blob: 6f7f7436f0efedaf97ad751cb24610f1f484ef31 [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/coresight-cti.h>
#include "coresight-priv.h"
#define cti_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off)
#define cti_readl(drvdata, off) __raw_readl(drvdata->base + off)
#define CTI_LOCK(drvdata) \
do { \
mb(); \
cti_writel(drvdata, 0x0, CORESIGHT_LAR); \
} while (0)
#define CTI_UNLOCK(drvdata) \
do { \
cti_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \
mb(); \
} while (0)
#define CTICONTROL (0x000)
#define CTIINTACK (0x010)
#define CTIAPPSET (0x014)
#define CTIAPPCLEAR (0x018)
#define CTIAPPPULSE (0x01C)
#define CTIINEN(n) (0x020 + (n * 4))
#define CTIOUTEN(n) (0x0A0 + (n * 4))
#define CTITRIGINSTATUS (0x130)
#define CTITRIGOUTSTATUS (0x134)
#define CTICHINSTATUS (0x138)
#define CTICHOUTSTATUS (0x13C)
#define CTIGATE (0x140)
#define ASICCTL (0x144)
#define ITCHINACK (0xEDC)
#define ITTRIGINACK (0xEE0)
#define ITCHOUT (0xEE4)
#define ITTRIGOUT (0xEE8)
#define ITCHOUTACK (0xEEC)
#define ITTRIGOUTACK (0xEF0)
#define ITCHIN (0xEF4)
#define ITTRIGIN (0xEF8)
#define CTI_MAX_TRIGGERS (8)
#define CTI_MAX_CHANNELS (4)
#define to_cti_drvdata(c) container_of(c, struct cti_drvdata, cti)
struct cti_drvdata {
void __iomem *base;
struct device *dev;
struct coresight_device *csdev;
struct clk *clk;
struct mutex mutex;
struct coresight_cti cti;
int refcnt;
};
static LIST_HEAD(cti_list);
static DEFINE_MUTEX(cti_lock);
static int cti_verify_bounds(int trig, int ch)
{
if (trig >= CTI_MAX_TRIGGERS)
return -EINVAL;
if (ch >= CTI_MAX_CHANNELS)
return -EINVAL;
return 0;
}
static int cti_enable(struct cti_drvdata *drvdata)
{
int ret;
ret = clk_prepare_enable(drvdata->clk);
if (ret)
return ret;
CTI_UNLOCK(drvdata);
cti_writel(drvdata, 0x1, CTICONTROL);
CTI_LOCK(drvdata);
return 0;
}
static int __cti_map_trigin(struct cti_drvdata *drvdata, int trig, int ch)
{
uint32_t ctien;
int ret;
if (drvdata->refcnt == 0) {
ret = cti_enable(drvdata);
if (ret)
return ret;
}
CTI_UNLOCK(drvdata);
ctien = cti_readl(drvdata, CTIINEN(trig));
if (ctien & (0x1 << ch))
goto out;
cti_writel(drvdata, (ctien | 0x1 << ch), CTIINEN(trig));
CTI_LOCK(drvdata);
drvdata->refcnt++;
return 0;
out:
CTI_LOCK(drvdata);
return 0;
}
int coresight_cti_map_trigin(struct coresight_cti *cti, int trig, int ch)
{
struct cti_drvdata *drvdata;
int ret;
if (IS_ERR_OR_NULL(cti))
return -EINVAL;
ret = cti_verify_bounds(trig, ch);
if (ret)
return ret;
drvdata = to_cti_drvdata(cti);
mutex_lock(&drvdata->mutex);
ret = __cti_map_trigin(drvdata, trig, ch);
mutex_unlock(&drvdata->mutex);
return ret;
}
EXPORT_SYMBOL(coresight_cti_map_trigin);
static int __cti_map_trigout(struct cti_drvdata *drvdata, int trig, int ch)
{
uint32_t ctien;
int ret;
if (drvdata->refcnt == 0) {
ret = cti_enable(drvdata);
if (ret)
return ret;
}
CTI_UNLOCK(drvdata);
ctien = cti_readl(drvdata, CTIOUTEN(trig));
if (ctien & (0x1 << ch))
goto out;
cti_writel(drvdata, (ctien | 0x1 << ch), CTIOUTEN(trig));
CTI_LOCK(drvdata);
drvdata->refcnt++;
return 0;
out:
CTI_LOCK(drvdata);
return 0;
}
int coresight_cti_map_trigout(struct coresight_cti *cti, int trig, int ch)
{
struct cti_drvdata *drvdata;
int ret;
if (IS_ERR_OR_NULL(cti))
return -EINVAL;
ret = cti_verify_bounds(trig, ch);
if (ret)
return ret;
drvdata = to_cti_drvdata(cti);
mutex_lock(&drvdata->mutex);
ret = __cti_map_trigout(drvdata, trig, ch);
mutex_unlock(&drvdata->mutex);
return ret;
}
EXPORT_SYMBOL(coresight_cti_map_trigout);
static void cti_disable(struct cti_drvdata *drvdata)
{
CTI_UNLOCK(drvdata);
cti_writel(drvdata, 0x0, CTICONTROL);
CTI_LOCK(drvdata);
clk_disable_unprepare(drvdata->clk);
}
static void __cti_unmap_trigin(struct cti_drvdata *drvdata, int trig, int ch)
{
uint32_t ctien;
CTI_UNLOCK(drvdata);
ctien = cti_readl(drvdata, CTIINEN(trig));
if (!(ctien & (0x1 << ch)))
goto out;
cti_writel(drvdata, (ctien & ~(0x1 << ch)), CTIINEN(trig));
CTI_LOCK(drvdata);
if (drvdata->refcnt == 1)
cti_disable(drvdata);
drvdata->refcnt--;
return;
out:
CTI_LOCK(drvdata);
return;
}
void coresight_cti_unmap_trigin(struct coresight_cti *cti, int trig, int ch)
{
struct cti_drvdata *drvdata;
if (IS_ERR_OR_NULL(cti))
return;
if (cti_verify_bounds(trig, ch))
return;
drvdata = to_cti_drvdata(cti);
mutex_lock(&drvdata->mutex);
__cti_unmap_trigin(drvdata, trig, ch);
mutex_unlock(&drvdata->mutex);
}
EXPORT_SYMBOL(coresight_cti_unmap_trigin);
static void __cti_unmap_trigout(struct cti_drvdata *drvdata, int trig, int ch)
{
uint32_t ctien;
CTI_UNLOCK(drvdata);
ctien = cti_readl(drvdata, CTIOUTEN(trig));
if (!(ctien & (0x1 << ch)))
goto out;
cti_writel(drvdata, (ctien & ~(0x1 << ch)), CTIOUTEN(trig));
CTI_LOCK(drvdata);
if (drvdata->refcnt == 1)
cti_disable(drvdata);
drvdata->refcnt--;
return;
out:
CTI_LOCK(drvdata);
return;
}
void coresight_cti_unmap_trigout(struct coresight_cti *cti, int trig, int ch)
{
struct cti_drvdata *drvdata;
if (IS_ERR_OR_NULL(cti))
return;
if (cti_verify_bounds(trig, ch))
return;
drvdata = to_cti_drvdata(cti);
mutex_lock(&drvdata->mutex);
__cti_unmap_trigout(drvdata, trig, ch);
mutex_unlock(&drvdata->mutex);
}
EXPORT_SYMBOL(coresight_cti_unmap_trigout);
static void __cti_reset(struct cti_drvdata *drvdata)
{
int trig;
if (!drvdata->refcnt)
return;
CTI_UNLOCK(drvdata);
for (trig = 0; trig < CTI_MAX_TRIGGERS; trig++) {
cti_writel(drvdata, 0, CTIINEN(trig));
cti_writel(drvdata, 0, CTIOUTEN(trig));
}
CTI_LOCK(drvdata);
cti_disable(drvdata);
drvdata->refcnt = 0;
}
void coresight_cti_reset(struct coresight_cti *cti)
{
struct cti_drvdata *drvdata;
if (IS_ERR_OR_NULL(cti))
return;
drvdata = to_cti_drvdata(cti);
mutex_lock(&drvdata->mutex);
__cti_reset(drvdata);
mutex_unlock(&drvdata->mutex);
}
EXPORT_SYMBOL(coresight_cti_reset);
struct coresight_cti *coresight_cti_get(const char *name)
{
struct coresight_cti *cti;
mutex_lock(&cti_lock);
list_for_each_entry(cti, &cti_list, link) {
if (!strncmp(cti->name, name, strlen(cti->name) + 1)) {
mutex_unlock(&cti_lock);
return cti;
}
}
mutex_unlock(&cti_lock);
return ERR_PTR(-EINVAL);
}
EXPORT_SYMBOL(coresight_cti_get);
void coresight_cti_put(struct coresight_cti *cti)
{
}
EXPORT_SYMBOL(coresight_cti_put);
static ssize_t cti_store_map_trigin(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val1, val2;
int ret;
if (sscanf(buf, "%lx %lx", &val1, &val2) != 2)
return -EINVAL;
ret = coresight_cti_map_trigin(&drvdata->cti, val1, val2);
if (ret)
return ret;
return size;
}
static DEVICE_ATTR(map_trigin, S_IWUSR, NULL, cti_store_map_trigin);
static ssize_t cti_store_map_trigout(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val1, val2;
int ret;
if (sscanf(buf, "%lx %lx", &val1, &val2) != 2)
return -EINVAL;
ret = coresight_cti_map_trigout(&drvdata->cti, val1, val2);
if (ret)
return ret;
return size;
}
static DEVICE_ATTR(map_trigout, S_IWUSR, NULL, cti_store_map_trigout);
static ssize_t cti_store_unmap_trigin(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val1, val2;
if (sscanf(buf, "%lx %lx", &val1, &val2) != 2)
return -EINVAL;
coresight_cti_unmap_trigin(&drvdata->cti, val1, val2);
return size;
}
static DEVICE_ATTR(unmap_trigin, S_IWUSR, NULL, cti_store_unmap_trigin);
static ssize_t cti_store_unmap_trigout(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val1, val2;
if (sscanf(buf, "%lx %lx", &val1, &val2) != 2)
return -EINVAL;
coresight_cti_unmap_trigout(&drvdata->cti, val1, val2);
return size;
}
static DEVICE_ATTR(unmap_trigout, S_IWUSR, NULL, cti_store_unmap_trigout);
static ssize_t cti_store_reset(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val;
if (sscanf(buf, "%lx", &val) != 1)
return -EINVAL;
if (!val)
return -EINVAL;
coresight_cti_reset(&drvdata->cti);
return size;
}
static DEVICE_ATTR(reset, S_IWUSR, NULL, cti_store_reset);
static ssize_t cti_show_trigin(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long trig, ch;
uint32_t ctien;
ssize_t size = 0;
mutex_lock(&cti_lock);
if (!drvdata->refcnt)
goto err;
for (trig = 0; trig < CTI_MAX_TRIGGERS; trig++) {
ctien = cti_readl(drvdata, CTIINEN(trig));
for (ch = 0; ch < CTI_MAX_CHANNELS; ch++) {
if (ctien & (1 << ch)) {
/* Ensure we do not write more than PAGE_SIZE
* bytes of data including \n character and null
* terminator
*/
size += scnprintf(&buf[size], PAGE_SIZE - size -
1, " %#lx %#lx,", trig, ch);
if (size >= PAGE_SIZE - 2) {
dev_err(dev, "show buffer full\n");
goto err;
}
}
}
}
err:
size += scnprintf(&buf[size], 2, "\n");
mutex_unlock(&cti_lock);
return size;
}
static DEVICE_ATTR(show_trigin, S_IRUGO, cti_show_trigin, NULL);
static ssize_t cti_show_trigout(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long trig, ch;
uint32_t ctien;
ssize_t size = 0;
mutex_lock(&cti_lock);
if (!drvdata->refcnt)
goto err;
for (trig = 0; trig < CTI_MAX_TRIGGERS; trig++) {
ctien = cti_readl(drvdata, CTIOUTEN(trig));
for (ch = 0; ch < CTI_MAX_CHANNELS; ch++) {
if (ctien & (1 << ch)) {
/* Ensure we do not write more than PAGE_SIZE
* bytes of data including \n character and null
* terminator
*/
size += scnprintf(&buf[size], PAGE_SIZE - size -
1, " %#lx %#lx,", trig, ch);
if (size >= PAGE_SIZE - 2) {
dev_err(dev, "show buffer full\n");
goto err;
}
}
}
}
err:
size += scnprintf(&buf[size], 2, "\n");
mutex_unlock(&cti_lock);
return size;
}
static DEVICE_ATTR(show_trigout, S_IRUGO, cti_show_trigout, NULL);
static struct attribute *cti_attrs[] = {
&dev_attr_map_trigin.attr,
&dev_attr_map_trigout.attr,
&dev_attr_unmap_trigin.attr,
&dev_attr_unmap_trigout.attr,
&dev_attr_reset.attr,
&dev_attr_show_trigin.attr,
&dev_attr_show_trigout.attr,
NULL,
};
static struct attribute_group cti_attr_grp = {
.attrs = cti_attrs,
};
static const struct attribute_group *cti_attr_grps[] = {
&cti_attr_grp,
NULL,
};
static int __devinit cti_probe(struct platform_device *pdev)
{
int ret;
struct device *dev = &pdev->dev;
struct coresight_platform_data *pdata;
struct cti_drvdata *drvdata;
struct resource *res;
struct coresight_desc *desc;
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;
/* Store the driver data pointer for use in exported functions */
drvdata->dev = &pdev->dev;
platform_set_drvdata(pdev, drvdata);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cti-base");
if (!res)
return -ENODEV;
drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
if (!drvdata->base)
return -ENOMEM;
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;
mutex_lock(&cti_lock);
drvdata->cti.name = ((struct coresight_platform_data *)
(pdev->dev.platform_data))->name;
list_add_tail(&drvdata->cti.link, &cti_list);
mutex_unlock(&cti_lock);
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 = cti_attr_grps;
desc->owner = THIS_MODULE;
drvdata->csdev = coresight_register(desc);
if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);
dev_info(dev, "CTI initialized\n");
return 0;
}
static int __devexit cti_remove(struct platform_device *pdev)
{
struct cti_drvdata *drvdata = platform_get_drvdata(pdev);
coresight_unregister(drvdata->csdev);
return 0;
}
static struct of_device_id cti_match[] = {
{.compatible = "arm,coresight-cti"},
{}
};
static struct platform_driver cti_driver = {
.probe = cti_probe,
.remove = __devexit_p(cti_remove),
.driver = {
.name = "coresight-cti",
.owner = THIS_MODULE,
.of_match_table = cti_match,
},
};
static int __init cti_init(void)
{
return platform_driver_register(&cti_driver);
}
module_init(cti_init);
static void __exit cti_exit(void)
{
platform_driver_unregister(&cti_driver);
}
module_exit(cti_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight CTI driver");