Mercurial > yaffs-ecoscentric-gpl
annotate direct/yaffs_norif1.c @ 228:16c5e095a48e
Extra page status checking to combat power loss causing only one bit to change
| author | charles <charles> |
|---|---|
| date | Thu, 13 Nov 2008 01:50:16 +0000 |
| parents | 37c7c7aaf779 |
| children | 9b3e943ffae1 |
| rev | line source |
|---|---|
| 224 | 1 /* |
| 2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. | |
| 3 * | |
| 4 * Copyright (C) 2002-2007 Aleph One Ltd. | |
| 5 * for Toby Churchill Ltd and Brightstar Engineering | |
| 6 * | |
| 7 * Created by Charles Manning <charles@aleph1.co.uk> | |
| 8 * | |
| 9 * This program is free software; you can redistribute it and/or modify | |
| 10 * it under the terms of the GNU General Public License version 2 as | |
| 11 * published by the Free Software Foundation. | |
| 12 */ | |
| 13 | |
| 14 /* | |
| 15 * This is an interface module for handling NOR in yaffs1 mode. | |
| 16 */ | |
| 17 | |
| 18 /* First set up for M18 with 1k chunks and 16-byte spares. | |
| 19 * | |
| 20 * NB We're using the oddball M18 modes of operation here | |
| 21 * The chip is 64MB based at 0x0000, but YAFFS only going to use the top half | |
| 22 * ie. YAFFS will be from 32MB to 64MB. | |
| 23 * | |
| 24 * The M18 has two ways of writing data. Every Programming Region (1kbytes) | |
| 25 * can be programmed in two modes: | |
| 26 * * Object Mode 1024 bytes of write once data. | |
| 27 * * Control Mode: 512bytes of bit-writeable data. | |
| 28 * This is arranged as 32 * (16 bytes of bit-writable followed by 16 bytes of "dont touch") | |
| 29 * | |
| 30 * The block size is 256kB, making 128 blocks in the 32MB YAFFS area. | |
| 31 * Each block comprises: | |
| 32 * Offset 0k: 248 x 1k data pages | |
| 33 * Offset 248k: 248 x 32-byte spare areas implemented as 16 bytes of spare followed by 16 bytes untouched) | |
| 34 * Offset 248k + (248 * 32): Format marker | |
| 35 * | |
| 36 */ | |
| 37 | |
|
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38 const char *yaffs_norif1_c_version = "$Id: yaffs_norif1.c,v 1.3 2008-11-13 01:50:16 charles Exp $"; |
| 224 | 39 |
| 40 #include "yaffs_norif1.h" | |
| 41 | |
| 42 #include "yportenv.h" | |
| 43 | |
| 44 #include "yaffs_flashif.h" | |
| 45 #include "yaffs_guts.h" | |
| 46 | |
| 47 #include "devextras.h" | |
| 48 | |
| 49 #define SPARE_BYTES_PER_CHUNK 16 | |
| 50 #define M18_SKIP 16 | |
| 51 #define PROG_REGION_SIZE 1024 | |
| 52 #define BLOCK_SIZE_IN_BYTES (256*1024) | |
| 53 #define CHUNKS_PER_BLOCK 248 | |
| 54 #define SPARE_AREA_OFFSET (CHUNKS_PER_BLOCK * PROG_REGION_SIZE) | |
| 55 | |
| 56 #define FORMAT_OFFSET (SPARE_AREA_OFFSET + CHUNKS_PER_BLOCK * (SPARE_BYTES_PER_CHUNK + M18_SKIP)) | |
| 57 | |
| 58 #define FORMAT_VALUE 0x1234 | |
| 59 | |
| 60 #define DATA_BYTES_PER_CHUNK 1024 | |
|
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61 #define BLOCKS_IN_DEVICE (8*1024/256) |
| 224 | 62 |
| 63 | |
| 64 #define YNOR_PREMARKER (0xF6) | |
| 65 #define YNOR_POSTMARKER (0xF0) | |
| 66 | |
| 67 | |
| 68 #if 1 | |
| 69 | |
| 70 /* Compile this for a simulation */ | |
| 71 #include "ynorsim.h" | |
| 72 #define ynorif1_FlashInit() ynorsim_Initialise() | |
| 73 #define ynorif1_FlashDeinit() ynorsim_Shutdown() | |
| 74 #define ynorif1_FlashWrite32(addr,buf,nwords) ynorsim_Write32(addr,buf,nwords) | |
| 75 #define ynorif1_FlashRead32(addr,buf,nwords) ynorsim_Read32(addr,buf,nwords) | |
| 76 #define ynorif1_FlashEraseBlock(addr) ynorsim_EraseBlock(addr) | |
| 77 #define DEVICE_BASE ynorsim_GetBase() | |
| 78 #else | |
| 79 | |
| 80 /* Compile this for running on blob, hacked for yaffs access */ | |
| 81 #include "../blob/yflashrw.h" | |
| 82 #define ynorif1_FlashInit() do{} while(0) | |
| 83 #define ynorif1_FlashDeinit() do {} while(0) | |
| 84 #define ynorif1_FlashWrite32(addr,buf,nwords) Y_FlashWrite(addr,buf,nwords) | |
| 85 #define ynorif1_FlashRead32(addr,buf,nwords) Y_FlashRead(addr,buf,nwords) | |
| 86 #define ynorif1_FlashEraseBlock(addr) Y_FlashErase(addr,BLOCK_SIZE_IN_BYTES) | |
| 87 #define DEVICE_BASE (32 * 1024 * 1024) | |
| 88 #endif | |
| 89 | |
| 90 __u32 *Block2Addr(yaffs_Device *dev, int blockNumber) | |
| 91 { | |
| 92 __u32 addr; | |
| 93 | |
| 94 addr = (__u32) DEVICE_BASE; | |
| 95 addr += blockNumber * BLOCK_SIZE_IN_BYTES; | |
| 96 | |
| 97 return (__u32 *) addr; | |
| 98 } | |
| 99 | |
| 100 __u32 *Block2FormatAddr(yaffs_Device *dev,int blockNumber) | |
| 101 { | |
| 102 __u32 addr; | |
| 103 | |
| 104 addr = (__u32) Block2Addr(dev,blockNumber); | |
| 105 addr += FORMAT_OFFSET; | |
| 106 | |
| 107 return (__u32 *)addr; | |
| 108 } | |
| 109 __u32 *Chunk2DataAddr(yaffs_Device *dev,int chunkId) | |
| 110 { | |
| 111 unsigned block; | |
| 112 unsigned chunkInBlock; | |
| 113 __u32 addr; | |
| 114 | |
| 115 block = chunkId/dev->nChunksPerBlock; | |
| 116 chunkInBlock = chunkId % dev->nChunksPerBlock; | |
| 117 | |
| 118 addr = (__u32) Block2Addr(dev,block); | |
| 119 addr += chunkInBlock * DATA_BYTES_PER_CHUNK; | |
| 120 | |
| 121 return (__u32 *)addr; | |
| 122 } | |
| 123 | |
| 124 __u32 *Chunk2SpareAddr(yaffs_Device *dev,int chunkId) | |
| 125 { | |
| 126 unsigned block; | |
| 127 unsigned chunkInBlock; | |
| 128 __u32 addr; | |
| 129 | |
| 130 block = chunkId/dev->nChunksPerBlock; | |
| 131 chunkInBlock = chunkId % dev->nChunksPerBlock; | |
| 132 | |
| 133 addr = (__u32) Block2Addr(dev,block); | |
| 134 addr += SPARE_AREA_OFFSET; | |
| 135 addr += chunkInBlock * (SPARE_BYTES_PER_CHUNK + M18_SKIP); | |
| 136 return (__u32 *)addr; | |
| 137 } | |
| 138 | |
| 139 | |
| 140 void ynorif1_AndBytes(__u8*target, const __u8 *src, int nbytes) | |
| 141 { | |
| 142 while(nbytes > 0){ | |
| 143 *target &= *src; | |
| 144 target++; | |
| 145 src++; | |
| 146 nbytes--; | |
| 147 } | |
| 148 } | |
| 149 | |
| 150 int ynorif1_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare) | |
| 151 { | |
| 152 __u32 *dataAddr = Chunk2DataAddr(dev,chunkInNAND); | |
| 153 __u32 *spareAddr = Chunk2SpareAddr(dev,chunkInNAND); | |
| 154 | |
| 155 yaffs_Spare tmpSpare; | |
| 156 | |
| 157 /* We should only be getting called for one of 3 reasons: | |
| 158 * Writing a chunk: data and spare will not be NULL | |
| 159 * Writing a deletion marker: data will be NULL, spare not NULL | |
| 160 * Writing a bad block marker: data will be NULL, spare not NULL | |
| 161 */ | |
| 162 | |
| 163 if(sizeof(yaffs_Spare) != 16) | |
| 164 YBUG(); | |
| 165 | |
| 166 if(data && spare) | |
| 167 { | |
| 168 if(spare->pageStatus != 0xff) | |
| 169 YBUG(); | |
| 170 /* Write a pre-marker */ | |
| 171 memset(&tmpSpare,0xff,sizeof(tmpSpare)); | |
| 172 tmpSpare.pageStatus = YNOR_PREMARKER; | |
| 173 ynorif1_FlashWrite32(spareAddr,(__u32 *)&tmpSpare,sizeof(yaffs_Spare)/4); | |
| 174 | |
| 175 /* Write the data */ | |
| 176 ynorif1_FlashWrite32(dataAddr,(__u32 *)data,dev->totalBytesPerChunk / 4); | |
| 177 | |
| 178 | |
| 179 memcpy(&tmpSpare,spare,sizeof(yaffs_Spare)); | |
| 180 | |
| 181 /* Write the real tags, but override the premarker*/ | |
| 182 tmpSpare.pageStatus = YNOR_PREMARKER; | |
| 183 ynorif1_FlashWrite32(spareAddr,(__u32 *)&tmpSpare,sizeof(yaffs_Spare)/4); | |
| 184 | |
| 185 /* Write a post-marker */ | |
| 186 tmpSpare.pageStatus = YNOR_POSTMARKER; | |
| 187 ynorif1_FlashWrite32(spareAddr,(__u32 *)&tmpSpare,sizeof(tmpSpare)/4); | |
| 188 | |
| 189 } else if(spare){ | |
| 190 /* This has to be a read-modify-write operation to handle NOR-ness */ | |
| 191 | |
| 192 ynorif1_FlashRead32(spareAddr,(__u32 *)&tmpSpare,16/ 4); | |
| 193 | |
| 194 ynorif1_AndBytes((__u8 *)&tmpSpare,(__u8 *)spare,sizeof(yaffs_Spare)); | |
| 195 | |
| 196 ynorif1_FlashWrite32(spareAddr,(__u32 *)&tmpSpare,16/ 4); | |
| 197 } | |
| 198 else { | |
| 199 YBUG(); | |
| 200 } | |
| 201 | |
| 202 | |
| 203 return YAFFS_OK; | |
| 204 | |
| 205 } | |
| 206 | |
| 207 int ynorif1_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare) | |
| 208 { | |
| 209 | |
| 210 __u32 *dataAddr = Chunk2DataAddr(dev,chunkInNAND); | |
| 211 __u32 *spareAddr = Chunk2SpareAddr(dev,chunkInNAND); | |
| 212 | |
| 213 if(data) | |
| 214 { | |
| 215 ynorif1_FlashRead32(dataAddr,(__u32 *)data,dev->totalBytesPerChunk / 4); | |
| 216 } | |
| 217 | |
| 218 if(spare) | |
| 219 { | |
| 220 ynorif1_FlashRead32(spareAddr,(__u32 *)spare,16/ 4); | |
| 221 | |
|
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222 /* If the page status is YNOR_POSTMARKER then it was written properly |
| 224 | 223 * so change that to 0xFF so that the rest of yaffs is happy. |
| 224 */ | |
| 225 if(spare->pageStatus == YNOR_POSTMARKER) | |
| 226 spare->pageStatus = 0xFF; | |
|
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227 else if(spare->pageStatus != 0xff && |
|
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228 (spare->pageStatus | YNOR_PREMARKER != 0xff)) |
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229 spare->pageStatus = YNOR_PREMARKER; |
| 224 | 230 } |
| 231 | |
| 232 | |
| 233 return YAFFS_OK; | |
| 234 | |
| 235 } | |
| 236 | |
| 237 static int ynorif1_FormatBlock(yaffs_Device *dev, int blockNumber) | |
| 238 { | |
| 239 __u32 *blockAddr = Block2Addr(dev,blockNumber); | |
| 240 __u32 *formatAddr = Block2FormatAddr(dev,blockNumber); | |
| 241 __u32 formatValue = FORMAT_VALUE; | |
| 242 | |
| 243 ynorif1_FlashEraseBlock(blockAddr); | |
| 244 ynorif1_FlashWrite32(formatAddr,&formatValue,1); | |
| 245 | |
| 246 return YAFFS_OK; | |
| 247 } | |
| 248 | |
| 249 static int ynorif1_UnformatBlock(yaffs_Device *dev, int blockNumber) | |
| 250 { | |
| 251 __u32 *formatAddr = Block2FormatAddr(dev,blockNumber); | |
| 252 __u32 formatValue = 0; | |
| 253 | |
| 254 ynorif1_FlashWrite32(formatAddr,&formatValue,1); | |
| 255 | |
| 256 return YAFFS_OK; | |
| 257 } | |
| 258 | |
| 259 static int ynorif1_IsBlockFormatted(yaffs_Device *dev, int blockNumber) | |
| 260 { | |
| 261 __u32 *formatAddr = Block2FormatAddr(dev,blockNumber); | |
| 262 __u32 formatValue; | |
| 263 | |
| 264 | |
| 265 ynorif1_FlashRead32(formatAddr,&formatValue,1); | |
| 266 | |
| 267 return (formatValue == FORMAT_VALUE); | |
| 268 } | |
| 269 | |
| 270 int ynorif1_EraseBlockInNAND(yaffs_Device *dev, int blockNumber) | |
| 271 { | |
| 272 | |
| 273 if(blockNumber < 0 || blockNumber >= BLOCKS_IN_DEVICE) | |
| 274 { | |
| 275 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber)); | |
| 276 return YAFFS_FAIL; | |
| 277 } | |
| 278 else | |
| 279 { | |
| 280 ynorif1_UnformatBlock(dev,blockNumber); | |
| 281 ynorif1_FormatBlock(dev,blockNumber); | |
| 282 return YAFFS_OK; | |
| 283 } | |
| 284 | |
| 285 } | |
| 286 | |
| 287 int ynorif1_InitialiseNAND(yaffs_Device *dev) | |
| 288 { | |
| 289 int i; | |
| 290 | |
| 291 ynorif1_FlashInit(); | |
| 292 /* Go through the blocks formatting them if they are not formatted */ | |
| 293 for(i = dev->startBlock; i <= dev->endBlock; i++){ | |
| 294 if(!ynorif1_IsBlockFormatted(dev,i)){ | |
| 295 ynorif1_FormatBlock(dev,i); | |
| 296 } | |
| 297 } | |
| 298 return YAFFS_OK; | |
| 299 } | |
| 300 | |
| 301 int ynorif1_DeinitialiseNAND(yaffs_Device *dev) | |
| 302 { | |
| 303 | |
| 304 ynorif1_FlashDeinit(); | |
| 305 | |
| 306 return YAFFS_OK; | |
| 307 } | |
| 308 | |
| 309 |