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 23 struct persistent_ram_buffer; 24 25 struct persistent_ram_descriptor { 26 const char *name; 27 phys_addr_t size; 28 }; 29 30 struct persistent_ram { 31 phys_addr_t start; 32 phys_addr_t size; 33 34 int ecc_block_size; 35 int ecc_size; 36 int ecc_symsize; 37 int ecc_poly; 38 39 int num_descs; 40 struct persistent_ram_descriptor *descs; 41 42 struct list_head node; 43 }; 44 45 struct persistent_ram_zone { 46 struct list_head node; 47 void *vaddr; 48 struct persistent_ram_buffer *buffer; 49 size_t buffer_size; 50 51 /* ECC correction */ 52 bool ecc; 53 char *par_buffer; 54 char *par_header; 55 struct rs_control *rs_decoder; 56 int corrected_bytes; 57 int bad_blocks; 58 int ecc_block_size; 59 int ecc_size; 60 int ecc_symsize; 61 int ecc_poly; 62 63 char *old_log; 64 size_t old_log_size; 65 size_t old_log_footer_size; 66 bool early; 67 }; 68 69 int persistent_ram_early_init(struct persistent_ram *ram); 70 71 struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev, 72 bool ecc); 73 74 int persistent_ram_write(struct persistent_ram_zone *prz, const void *s, 75 unsigned int count); 76 77 size_t persistent_ram_old_size(struct persistent_ram_zone *prz); 78 void *persistent_ram_old(struct persistent_ram_zone *prz); 79 void persistent_ram_free_old(struct persistent_ram_zone *prz); 80 ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, 81 char *str, size_t len); 82 83 #endif 84