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/* Copyright (c) 2012, 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/memory_alloc.h>
#include <linux/notifier.h>
#include <mach/scm.h>
#include <mach/msm_cache_dump.h>
#include <mach/memory.h>
#include <mach/msm_iomap.h>
#define L2_DUMP_OFFSET 0x14
static unsigned long msm_cache_dump_addr;
/*
* These should not actually be dereferenced. There's no
* need for a virtual mapping, but the physical address is
* necessary.
*/
static struct l1_cache_dump *l1_dump;
static struct l2_cache_dump *l2_dump;
static int msm_cache_dump_panic(struct notifier_block *this,
unsigned long event, void *ptr)
{
#ifdef CONFIG_MSM_CACHE_DUMP_ON_PANIC
/*
* Clear the bootloader magic so the dumps aren't overwritten
*/
__raw_writel(0, MSM_IMEM_BASE + L2_DUMP_OFFSET);
scm_call_atomic1(L1C_SERVICE_ID, CACHE_BUFFER_DUMP_COMMAND_ID, 2);
scm_call_atomic1(L1C_SERVICE_ID, CACHE_BUFFER_DUMP_COMMAND_ID, 1);
#endif
return 0;
}
static struct notifier_block msm_cache_dump_blk = {
.notifier_call = msm_cache_dump_panic,
/*
* higher priority to ensure this runs before another panic handler
* flushes the caches.
*/
.priority = 1,
};
static int msm_cache_dump_probe(struct platform_device *pdev)
{
struct msm_cache_dump_platform_data *d = pdev->dev.platform_data;
int ret;
struct {
unsigned long buf;
unsigned long size;
} l1_cache_data;
void *temp;
unsigned long total_size = d->l1_size + d->l2_size;
msm_cache_dump_addr = allocate_contiguous_ebi_nomap(total_size, SZ_4K);
if (!msm_cache_dump_addr) {
pr_err("%s: Could not get memory for cache dumping\n",
__func__);
return -ENOMEM;
}
temp = ioremap(msm_cache_dump_addr, total_size);
memset(temp, 0xFF, total_size);
iounmap(temp);
l1_cache_data.buf = msm_cache_dump_addr;
l1_cache_data.size = d->l1_size;
ret = scm_call(L1C_SERVICE_ID, L1C_BUFFER_SET_COMMAND_ID,
&l1_cache_data, sizeof(l1_cache_data), NULL, 0);
if (ret)
pr_err("%s: could not register L1 buffer ret = %d.\n",
__func__, ret);
l1_dump = (struct l1_cache_dump *)msm_cache_dump_addr;
#if defined(CONFIG_MSM_CACHE_DUMP_ON_PANIC)
l1_cache_data.buf = msm_cache_dump_addr + d->l1_size;
l1_cache_data.size = d->l2_size;
ret = scm_call(L1C_SERVICE_ID, L2C_BUFFER_SET_COMMAND_ID,
&l1_cache_data, sizeof(l1_cache_data), NULL, 0);
if (ret)
pr_err("%s: could not register L2 buffer ret = %d.\n",
__func__, ret);
#endif
__raw_writel(msm_cache_dump_addr + d->l1_size,
MSM_IMEM_BASE + L2_DUMP_OFFSET);
l2_dump = (struct l2_cache_dump *)(msm_cache_dump_addr + d->l1_size);
atomic_notifier_chain_register(&panic_notifier_list,
&msm_cache_dump_blk);
return 0;
}
static int msm_cache_dump_remove(struct platform_device *pdev)
{
atomic_notifier_chain_unregister(&panic_notifier_list,
&msm_cache_dump_blk);
return 0;
}
static struct platform_driver msm_cache_dump_driver = {
.remove = __devexit_p(msm_cache_dump_remove),
.driver = {
.name = "msm_cache_dump",
.owner = THIS_MODULE
},
};
static int __init msm_cache_dump_init(void)
{
return platform_driver_probe(&msm_cache_dump_driver,
msm_cache_dump_probe);
}
static void __exit msm_cache_dump_exit(void)
{
platform_driver_unregister(&msm_cache_dump_driver);
}
late_initcall(msm_cache_dump_init);
module_exit(msm_cache_dump_exit)
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