android_kernel_samsung_hero.../drivers/soc/qcom/rpm_rail_stats.c
2016-08-17 16:41:52 +08:00

322 lines
7.3 KiB
C

/* Copyright (c) 2015, 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/debugfs.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/of.h>
#include <linux/uaccess.h>
#include "rpm_stats.h"
#define RPM_RAIL_BUF_LEN 600
#define SNPRINTF(buf, size, format, ...) \
do { \
if (size > 0) { \
int ret; \
ret = snprintf(buf, size, format, ## __VA_ARGS__); \
if (ret > size) { \
buf += size; \
size = 0; \
} else { \
buf += ret; \
size -= ret; \
} \
} \
} while (0)
#define NAMELEN (sizeof(uint32_t)+1)
struct msm_rpm_rail_stats_platform_data {
phys_addr_t phys_addr_base;
u32 phys_size;
};
struct msm_rpm_rail_corner {
uint64_t time;
uint32_t corner;
uint32_t reserved;
};
struct msm_rpm_rail_type {
uint32_t rail;
uint32_t num_corners;
uint32_t current_corner;
uint32_t last_entered;
};
struct msm_rpm_rail_stats {
uint32_t num_rails;
uint32_t reserved;
};
struct msm_rpm_rail_stats_private_data {
void __iomem *reg_base;
u32 len;
char buf[RPM_RAIL_BUF_LEN];
struct msm_rpm_rail_stats_platform_data *platform_data;
};
int msm_rpm_rail_stats_file_close(struct inode *inode, struct file *file)
{
struct msm_rpm_rail_stats_private_data *private = file->private_data;
if (private->reg_base)
iounmap(private->reg_base);
kfree(file->private_data);
return 0;
}
static int msm_rpm_rail_corner_copy(void __iomem **base, char **buf,
int count)
{
struct msm_rpm_rail_corner rc;
char corner[NAMELEN];
memset(&rc, 0, sizeof(rc));
memcpy_fromio(&rc, *base, sizeof(rc));
corner[NAMELEN - 1] = '\0';
memcpy(corner, &rc.corner, NAMELEN - 1);
SNPRINTF(*buf, count, "\t\tcorner:%-5s time:%-16llu\n",
corner, rc.time);
*base += sizeof(rc);
return count;
}
static int msm_rpm_rail_type_copy(void __iomem **base, char **buf, int count)
{
struct msm_rpm_rail_type rt;
char rail[NAMELEN];
int i;
memset(&rt, 0, sizeof(rt));
memcpy_fromio(&rt, *base, sizeof(rt));
rail[NAMELEN - 1] = '\0';
memcpy(rail, &rt.rail, NAMELEN - 1);
SNPRINTF(*buf, count,
"\trail:%-2s num_corners:%-2u current_corner:%-2u last_entered:%-8u\n",
rail, rt.num_corners, rt.current_corner, rt.last_entered);
*base += sizeof(rt);
for (i = 0; i < rt.num_corners; i++)
count = msm_rpm_rail_corner_copy(base, buf, count);
return count;
}
static int msm_rpm_rail_stats_copy(
struct msm_rpm_rail_stats_private_data *prvdata)
{
struct msm_rpm_rail_stats rs;
void __iomem *base = prvdata->reg_base;
char *buf = prvdata->buf;
int count = RPM_RAIL_BUF_LEN;
int i;
memset(&rs, 0, sizeof(rs));
memcpy_fromio(&rs, base, sizeof(rs));
SNPRINTF(buf, count, "Number of Rails:%u\n", rs.num_rails);
base = prvdata->reg_base + sizeof(rs);
for (i = 0; i < rs.num_rails; i++)
count = msm_rpm_rail_type_copy(&base, &buf, count);
return RPM_RAIL_BUF_LEN - count;
}
static ssize_t msm_rpm_rail_stats_file_read(struct file *file,
char __user *bufu, size_t count, loff_t *ppos)
{
struct msm_rpm_rail_stats_private_data *prvdata =
file->private_data;
struct msm_rpm_rail_stats_platform_data *pdata;
if (!prvdata)
return -EINVAL;
if (!prvdata->platform_data)
return -EINVAL;
if (!bufu || count == 0)
return -EINVAL;
pdata = prvdata->platform_data;
if (*ppos <= pdata->phys_size) {
prvdata->len = msm_rpm_rail_stats_copy(prvdata);
*ppos = 0;
}
return simple_read_from_buffer(bufu, count, ppos,
prvdata->buf, prvdata->len);
}
static int msm_rpm_rail_stats_file_open(struct inode *inode,
struct file *file)
{
struct msm_rpm_rail_stats_private_data *prvdata;
struct msm_rpm_rail_stats_platform_data *pdata = inode->i_private;
file->private_data =
kzalloc(sizeof(struct msm_rpm_rail_stats_private_data),
GFP_KERNEL);
if (!file->private_data)
return -ENOMEM;
prvdata = file->private_data;
prvdata->reg_base = ioremap(pdata->phys_addr_base,
pdata->phys_size);
if (!prvdata->reg_base) {
kfree(file->private_data);
prvdata = NULL;
pr_err("%s: ERROR could not ioremap start=%pa, len=%u\n",
__func__, &pdata->phys_addr_base,
pdata->phys_size);
return -EBUSY;
}
prvdata->len = 0;
prvdata->platform_data = pdata;
return 0;
}
static const struct file_operations msm_rpm_rail_stats_fops = {
.owner = THIS_MODULE,
.open = msm_rpm_rail_stats_file_open,
.read = msm_rpm_rail_stats_file_read,
.release = msm_rpm_rail_stats_file_close,
.llseek = no_llseek,
};
static int msm_rpm_rail_stats_probe(struct platform_device *pdev)
{
struct dentry *dent;
struct msm_rpm_rail_stats_platform_data *pdata;
struct resource *res;
struct resource *offset;
struct device_node *node;
uint32_t offset_addr;
void __iomem *phys_ptr;
if (!pdev)
return -EINVAL;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"phys_addr_base");
if (!res)
return -EINVAL;
offset = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"offset_addr");
if (!offset)
return -EINVAL;
phys_ptr = ioremap_nocache(offset->start, SZ_4);
if (!phys_ptr) {
pr_err("%s: Failed to ioremap address: %x\n",
__func__, offset_addr);
return -ENODEV;
}
offset_addr = readl_relaxed(phys_ptr);
iounmap(phys_ptr);
if (!offset_addr) {
pr_err("%s: RPM Rail Stats not available: Exit\n", __func__);
return 0;
}
node = pdev->dev.of_node;
if (pdev->dev.platform_data)
pdata = pdev->dev.platform_data;
else if (node)
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->phys_addr_base = res->start + offset_addr;
pdata->phys_size = resource_size(res);
dent = debugfs_create_file("rpm_rail_stats", S_IRUGO, NULL,
pdata, &msm_rpm_rail_stats_fops);
if (!dent) {
dev_err(&pdev->dev, "%s: ERROR debugfs_create_file failed\n",
__func__);
return -ENOMEM;
}
platform_set_drvdata(pdev, dent);
return 0;
}
static int msm_rpm_rail_stats_remove(struct platform_device *pdev)
{
struct dentry *dent = platform_get_drvdata(pdev);
debugfs_remove(dent);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct of_device_id rpm_rail_table[] = {
{.compatible = "qcom,rpm-rail-stats"},
{},
};
static struct platform_driver msm_rpm_rail_stats_driver = {
.probe = msm_rpm_rail_stats_probe,
.remove = msm_rpm_rail_stats_remove,
.driver = {
.name = "msm_rpm_rail_stats",
.owner = THIS_MODULE,
.of_match_table = rpm_rail_table,
},
};
static int __init msm_rpm_rail_stats_init(void)
{
return platform_driver_register(&msm_rpm_rail_stats_driver);
}
static void __exit msm_rpm_rail_stats_exit(void)
{
platform_driver_unregister(&msm_rpm_rail_stats_driver);
}
module_init(msm_rpm_rail_stats_init);
module_exit(msm_rpm_rail_stats_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MSM RPM rail Statistics driver");
MODULE_ALIAS("platform:msm_rail_stat_log");