115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2019 MediaTek Inc.
|
|
* Author: Sagy Shih <sagy.shih@mediatek.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/printk.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/debugfs.h>
|
|
|
|
#include <mt-plat/sync_write.h>
|
|
#include <emi_io.h>
|
|
#include <mt_emi.h>
|
|
#if DBG_INFO_READY
|
|
#include <plat_dbg_info.h>
|
|
#endif
|
|
|
|
static struct dentry *emi_mbw_dir;
|
|
static struct dentry *dump_buf;
|
|
static void __iomem *mbw_dram_buf;
|
|
static bool elm_enabled;
|
|
|
|
static ssize_t dump_buf_read
|
|
(struct file *file, char __user *data, size_t len, loff_t *ppos)
|
|
{
|
|
ssize_t bytes = len < (MBW_BUF_LEN - *ppos) ?
|
|
len : (MBW_BUF_LEN - *ppos);
|
|
|
|
if (!mbw_dram_buf)
|
|
return 0;
|
|
|
|
if (bytes) {
|
|
if (copy_to_user(data, (char *)mbw_dram_buf + *ppos, bytes))
|
|
return -EFAULT;
|
|
}
|
|
|
|
*ppos += bytes;
|
|
|
|
return bytes;
|
|
}
|
|
|
|
static int dump_buf_open(struct inode *inode, struct file *file)
|
|
{
|
|
return nonseekable_open(inode, file);
|
|
}
|
|
|
|
static const struct file_operations dump_buf_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = dump_buf_read,
|
|
.open = dump_buf_open
|
|
};
|
|
|
|
void elm_init(struct platform_driver *emi_ctrl, struct platform_device *pdev)
|
|
{
|
|
void __iomem *LAST_EMI_BASE;
|
|
unsigned int mbw_buf_h, mbw_buf_l;
|
|
phys_addr_t mbw_buf_start;
|
|
|
|
pr_info("[ELM] initialize EMI ELMv2\n");
|
|
|
|
#if DBG_INFO_READY
|
|
LAST_EMI_BASE = get_dbg_info_base(0xE31C);
|
|
#else
|
|
LAST_EMI_BASE = NULL;
|
|
#endif
|
|
if (!LAST_EMI_BASE) {
|
|
pr_err("[ELM] get LAST_EMI_BASE fail\n");
|
|
return;
|
|
}
|
|
|
|
elm_enabled = false;
|
|
if (readl(IOMEM(LAST_EMI_DECS_CTRL)) == 0xDECDDECD) {
|
|
mbw_buf_l = readl(IOMEM(LAST_EMI_MBW_BUF_L));
|
|
mbw_buf_h = readl(IOMEM(LAST_EMI_MBW_BUF_H));
|
|
#ifdef CONFIG_PHYS_ADDR_T_64BIT
|
|
mbw_buf_start = ((phys_addr_t)mbw_buf_h << 32) + mbw_buf_l;
|
|
#else
|
|
mbw_buf_start = (phys_addr_t)mbw_buf_l;
|
|
#endif
|
|
mbw_dram_buf = ioremap_wc(mbw_buf_start, MBW_BUF_LEN);
|
|
elm_enabled = true;
|
|
pr_info("[ELM] enable mbw_buf dump\n");
|
|
}
|
|
|
|
emi_mbw_dir = debugfs_create_dir("emi_mbw", NULL);
|
|
if (!emi_mbw_dir) {
|
|
pr_err("[ELM] create dir fail\n");
|
|
return;
|
|
}
|
|
|
|
dump_buf = debugfs_create_file("dump_buf", 0444,
|
|
emi_mbw_dir, NULL, &dump_buf_fops);
|
|
if (!dump_buf) {
|
|
pr_err("[ELM] create dump_buf fail\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
void suspend_elm(void)
|
|
{
|
|
}
|
|
|
|
void resume_elm(void)
|
|
{
|
|
}
|
|
|