blob: 79a27f40504ce6c42abfde70b198792c03febaba [file] [log] [blame]
/* Copyright (c) 2011-2012, Code Aurora Forum. 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/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/coresight.h>
#include "coresight-priv.h"
#define funnel_writel(drvdata, id, val, off) \
__raw_writel((val), drvdata->base + (SZ_4K * id) + off)
#define funnel_readl(drvdata, id, off) \
__raw_readl(drvdata->base + (SZ_4K * id) + off)
#define FUNNEL_FUNCTL (0x000)
#define FUNNEL_PRICTL (0x004)
#define FUNNEL_ITATBDATA0 (0xEEC)
#define FUNNEL_ITATBCTR2 (0xEF0)
#define FUNNEL_ITATBCTR1 (0xEF4)
#define FUNNEL_ITATBCTR0 (0xEF8)
#define FUNNEL_LOCK(id) \
do { \
mb(); \
funnel_writel(drvdata, id, 0x0, CORESIGHT_LAR); \
} while (0)
#define FUNNEL_UNLOCK(id) \
do { \
funnel_writel(drvdata, id, CORESIGHT_UNLOCK, CORESIGHT_LAR); \
mb(); \
} while (0)
#define FUNNEL_HOLDTIME_MASK (0xF00)
#define FUNNEL_HOLDTIME_SHFT (0x8)
#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
struct funnel_drvdata {
void __iomem *base;
bool enabled;
struct mutex mutex;
struct device *dev;
struct kobject *kobj;
struct clk *clk;
uint32_t priority;
};
static struct funnel_drvdata *drvdata;
static void __funnel_enable(uint8_t id, uint32_t port_mask)
{
uint32_t functl;
FUNNEL_UNLOCK(id);
functl = funnel_readl(drvdata, id, FUNNEL_FUNCTL);
functl &= ~FUNNEL_HOLDTIME_MASK;
functl |= FUNNEL_HOLDTIME;
functl |= port_mask;
funnel_writel(drvdata, id, functl, FUNNEL_FUNCTL);
funnel_writel(drvdata, id, drvdata->priority, FUNNEL_PRICTL);
FUNNEL_LOCK(id);
}
int funnel_enable(uint8_t id, uint32_t port_mask)
{
int ret;
ret = clk_prepare_enable(drvdata->clk);
if (ret)
return ret;
mutex_lock(&drvdata->mutex);
__funnel_enable(id, port_mask);
drvdata->enabled = true;
dev_info(drvdata->dev, "FUNNEL port mask 0x%lx enabled\n",
(unsigned long) port_mask);
mutex_unlock(&drvdata->mutex);
return 0;
}
static void __funnel_disable(uint8_t id, uint32_t port_mask)
{
uint32_t functl;
FUNNEL_UNLOCK(id);
functl = funnel_readl(drvdata, id, FUNNEL_FUNCTL);
functl &= ~port_mask;
funnel_writel(drvdata, id, functl, FUNNEL_FUNCTL);
FUNNEL_LOCK(id);
}
void funnel_disable(uint8_t id, uint32_t port_mask)
{
mutex_lock(&drvdata->mutex);
__funnel_disable(id, port_mask);
drvdata->enabled = false;
dev_info(drvdata->dev, "FUNNEL port mask 0x%lx disabled\n",
(unsigned long) port_mask);
mutex_unlock(&drvdata->mutex);
clk_disable_unprepare(drvdata->clk);
}
static ssize_t funnel_show_priority(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned long val = drvdata->priority;
return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
static ssize_t funnel_store_priority(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
unsigned long val;
if (sscanf(buf, "%lx", &val) != 1)
return -EINVAL;
drvdata->priority = val;
return size;
}
static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, funnel_show_priority,
funnel_store_priority);
static int __devinit funnel_sysfs_init(void)
{
int ret;
drvdata->kobj = kobject_create_and_add("funnel", qdss_get_modulekobj());
if (!drvdata->kobj) {
dev_err(drvdata->dev, "failed to create FUNNEL sysfs kobject\n");
ret = -ENOMEM;
goto err_create;
}
ret = sysfs_create_file(drvdata->kobj, &dev_attr_priority.attr);
if (ret) {
dev_err(drvdata->dev, "failed to create FUNNEL sysfs priority"
" attribute\n");
goto err_file;
}
return 0;
err_file:
kobject_put(drvdata->kobj);
err_create:
return ret;
}
static void __devexit funnel_sysfs_exit(void)
{
sysfs_remove_file(drvdata->kobj, &dev_attr_priority.attr);
kobject_put(drvdata->kobj);
}
static int __devinit funnel_probe(struct platform_device *pdev)
{
int ret;
struct resource *res;
drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
if (!drvdata) {
ret = -ENOMEM;
goto err_kzalloc_drvdata;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -EINVAL;
goto err_res;
}
drvdata->base = ioremap_nocache(res->start, resource_size(res));
if (!drvdata->base) {
ret = -EINVAL;
goto err_ioremap;
}
drvdata->dev = &pdev->dev;
mutex_init(&drvdata->mutex);
drvdata->clk = clk_get(drvdata->dev, "core_clk");
if (IS_ERR(drvdata->clk)) {
ret = PTR_ERR(drvdata->clk);
goto err_clk_get;
}
ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
if (ret)
goto err_clk_rate;
funnel_sysfs_init();
dev_info(drvdata->dev, "FUNNEL initialized\n");
return 0;
err_clk_rate:
clk_put(drvdata->clk);
err_clk_get:
mutex_destroy(&drvdata->mutex);
iounmap(drvdata->base);
err_ioremap:
err_res:
kfree(drvdata);
err_kzalloc_drvdata:
dev_err(drvdata->dev, "FUNNEL init failed\n");
return ret;
}
static int __devexit funnel_remove(struct platform_device *pdev)
{
if (drvdata->enabled)
funnel_disable(0x0, 0xFF);
funnel_sysfs_exit();
clk_put(drvdata->clk);
mutex_destroy(&drvdata->mutex);
iounmap(drvdata->base);
kfree(drvdata);
return 0;
}
static struct of_device_id funnel_match[] = {
{.compatible = "qcom,msm-funnel"},
{}
};
static struct platform_driver funnel_driver = {
.probe = funnel_probe,
.remove = __devexit_p(funnel_remove),
.driver = {
.name = "msm_funnel",
.owner = THIS_MODULE,
.of_match_table = funnel_match,
},
};
static int __init funnel_init(void)
{
return platform_driver_register(&funnel_driver);
}
module_init(funnel_init);
static void __exit funnel_exit(void)
{
platform_driver_unregister(&funnel_driver);
}
module_exit(funnel_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Funnel driver");