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/* 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 "coresight.h"
#include <mach/sec_debug.h>
#define funnel_writel(funnel, id, val, off) \
__raw_writel((val), funnel.base + (SZ_4K * id) + off)
#define funnel_readl(funnel, id, off) \
__raw_readl(funnel.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(funnel, id, 0x0, CS_LAR); \
} while (0)
#define FUNNEL_UNLOCK(id) \
do { \
funnel_writel(funnel, id, CS_UNLOCK_MAGIC, CS_LAR); \
mb(); \
} while (0)
#define FUNNEL_HOLDTIME_MASK (0xF00)
#define FUNNEL_HOLDTIME_SHFT (0x8)
#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
struct funnel_ctx {
void __iomem *base;
bool enabled;
struct device *dev;
struct kobject *kobj;
uint32_t priority;
};
static struct funnel_ctx funnel = {
.priority = 0xFAC680,
};
static void __funnel_enable(uint8_t id, uint32_t port_mask)
{
uint32_t functl;
FUNNEL_UNLOCK(id);
functl = funnel_readl(funnel, id, FUNNEL_FUNCTL);
functl &= ~FUNNEL_HOLDTIME_MASK;
functl |= FUNNEL_HOLDTIME;
functl |= port_mask;
funnel_writel(funnel, id, functl, FUNNEL_FUNCTL);
funnel_writel(funnel, id, funnel.priority, FUNNEL_PRICTL);
FUNNEL_LOCK(id);
}
void funnel_enable(uint8_t id, uint32_t port_mask)
{
__funnel_enable(id, port_mask);
funnel.enabled = true;
}
static void __funnel_disable(uint8_t id, uint32_t port_mask)
{
uint32_t functl;
FUNNEL_UNLOCK(id);
functl = funnel_readl(funnel, id, FUNNEL_FUNCTL);
functl &= ~port_mask;
funnel_writel(funnel, id, functl, FUNNEL_FUNCTL);
FUNNEL_LOCK(id);
}
void funnel_disable(uint8_t id, uint32_t port_mask)
{
__funnel_disable(id, port_mask);
funnel.enabled = false;
}
#define FUNNEL_ATTR(name) \
static struct kobj_attribute name##_attr = \
__ATTR(name, S_IRUGO | S_IWUSR, name##_show, name##_store)
static ssize_t priority_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned long val;
if (sscanf(buf, "%lx", &val) != 1)
return -EINVAL;
funnel.priority = val;
return n;
}
static ssize_t priority_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
unsigned long val = funnel.priority;
return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}
FUNNEL_ATTR(priority);
static int __init funnel_sysfs_init(void)
{
int ret;
funnel.kobj = kobject_create_and_add("funnel", \
coresight_get_modulekobj());
if (!funnel.kobj) {
dev_err(funnel.dev, "failed to create FUNNEL sysfs kobject\n");
ret = -ENOMEM;
goto err_create;
}
ret = sysfs_create_file(funnel.kobj, &priority_attr.attr);
if (ret) {
dev_err(funnel.dev, "failed to create FUNNEL sysfs priority"
" attribute\n");
goto err_file;
}
return 0;
err_file:
kobject_put(funnel.kobj);
err_create:
return ret;
}
static void funnel_sysfs_exit(void)
{
sysfs_remove_file(funnel.kobj, &priority_attr.attr);
kobject_put(funnel.kobj);
}
static int __devinit funnel_probe(struct platform_device *pdev)
{
int ret;
struct resource *res;
if (!sec_debug_level.en.kernel_fault) {
pr_info("%s: debug level is low\n",__func__);
return -ENODEV;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -EINVAL;
goto err_res;
}
funnel.base = ioremap_nocache(res->start, resource_size(res));
if (!funnel.base) {
ret = -EINVAL;
goto err_ioremap;
}
funnel.dev = &pdev->dev;
funnel_sysfs_init();
dev_info(funnel.dev, "FUNNEL initialized\n");
return 0;
err_ioremap:
err_res:
dev_err(funnel.dev, "FUNNEL init failed\n");
return ret;
}
static int funnel_remove(struct platform_device *pdev)
{
if (funnel.enabled)
funnel_disable(0x0, 0xFF);
funnel_sysfs_exit();
iounmap(funnel.base);
return 0;
}
static struct platform_driver funnel_driver = {
.probe = funnel_probe,
.remove = funnel_remove,
.driver = {
.name = "coresight_funnel",
},
};
int __init funnel_init(void)
{
return platform_driver_register(&funnel_driver);
}
void funnel_exit(void)
{
platform_driver_unregister(&funnel_driver);
}
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