LXR linux/drivers/staging/android/persistent

   1/*
   2 * Copyright (C) 2011 Google, Inc.
   3 *
   4 * This software is licensed under the terms of the GNU General Public
   5 * License version 2, as published by the Free Software Foundation, and
   6 * may be copied, distributed, and modified under those terms.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 */
  14
  15#ifndef __LINUX_PERSISTENT_RAM_H__
  16#define __LINUX_PERSISTENT_RAM_H__
  17
  18#include <linux/device.h>
  19#include <linux/kernel.h>
  20#include <linux/list.h>
  21#include <linux/types.h>
  22
  23struct persistent_ram_buffer;
  24
  25struct persistent_ram_descriptor {
  26        const char      *name;
  27        phys_addr_t     size;
  28};
  29
  30struct persistent_ram {
  31        phys_addr_t     start;
  32        phys_addr_t     size;
  33
  34        int                                     num_descs;
  35        struct persistent_ram_descriptor        *descs;
  36
  37        struct list_head node;
  38};
  39
  40struct persistent_ram_zone {
  41        struct list_head node;
  42        void *vaddr;
  43        struct persistent_ram_buffer *buffer;
  44        size_t buffer_size;
  45
  46        /* ECC correction */
  47        bool ecc;
  48        char *par_buffer;
  49        char *par_header;
  50        struct rs_control *rs_decoder;
  51        int corrected_bytes;
  52        int bad_blocks;
  53        int ecc_block_size;
  54        int ecc_size;
  55        int ecc_symsize;
  56        int ecc_poly;
  57
  58        char *old_log;
  59        size_t old_log_size;
  60        size_t old_log_footer_size;
  61        bool early;
  62};
  63
  64int persistent_ram_early_init(struct persistent_ram *ram);
  65
  66struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev,
  67                bool ecc);
  68
  69int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
  70        unsigned int count);
  71
  72size_t persistent_ram_old_size(struct persistent_ram_zone *prz);
  73void *persistent_ram_old(struct persistent_ram_zone *prz);
  74void persistent_ram_free_old(struct persistent_ram_zone *prz);
  75ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
  76        char *str, size_t len);
  77
  78#endif
  79