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/*
* Copyright (C) 2011 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#ifndef __LINUX_PERSISTENT_RAM_H__
#define __LINUX_PERSISTENT_RAM_H__
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/types.h>
struct persistent_ram_buffer;
struct persistent_ram_descriptor {
const char *name;
phys_addr_t size;
};
struct persistent_ram {
phys_addr_t start;
phys_addr_t size;
int num_descs;
struct persistent_ram_descriptor *descs;
struct list_head node;
};
struct persistent_ram_zone {
struct list_head node;
void *vaddr;
struct persistent_ram_buffer *buffer;
size_t buffer_size;
/* ECC correction */
bool ecc;
char *par_buffer;
char *par_header;
struct rs_control *rs_decoder;
int corrected_bytes;
int bad_blocks;
int ecc_block_size;
int ecc_size;
int ecc_symsize;
int ecc_poly;
char *old_log;
size_t old_log_size;
size_t old_log_footer_size;
bool early;
};
int persistent_ram_early_init(struct persistent_ram *ram);
struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev,
bool ecc);
int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
unsigned int count);
size_t persistent_ram_old_size(struct persistent_ram_zone *prz);
void *persistent_ram_old(struct persistent_ram_zone *prz);
void persistent_ram_free_old(struct persistent_ram_zone *prz);
ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
char *str, size_t len);
#endif
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