2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
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.
15 * This provides a YAFFS nand emulation on a file for emulating 2kB pages.
16 * This is only intended as test code to test persistence etc.
20 #include "yaffs_trace.h"
22 #include "yaffs_flashif2.h"
23 #include "yaffs_guts.h"
24 #include "yaffs_fileem2k.h"
25 #include "yaffs_packedtags2.h"
28 #include <sys/types.h>
33 #define REPORT_ERROR 0
37 u8 data[PAGE_SIZE]; // Data + spare
42 yflash_Page page[PAGES_PER_BLOCK]; // The pages in the block
48 #define MAX_HANDLES 20
49 #define BLOCKS_PER_HANDLE (32*8)
53 int handle[MAX_HANDLES];
57 static yflash_Device filedisk;
59 int yaffs_test_partial_write = 0;
61 extern int random_seed;
62 extern int simulate_power_failure;
63 static int remaining_ops;
64 static int nops_so_far;
69 static void yflash2_MaybePowerFail(unsigned int nand_chunk, int failPoint)
76 if(simulate_power_failure &&
78 printf("Simulated power failure after %d operations\n",nops_so_far);
79 printf(" power failed on nand_chunk %d, at fail point %d\n",
80 nand_chunk, failPoint);
89 static u8 localBuffer[PAGE_SIZE];
91 static char *NToName(char *buf,int n)
93 sprintf(buf,"emfile-2k-%d",n);
97 static char dummyBuffer[BLOCK_SIZE];
99 static int GetBlockFileHandle(int n)
109 h = open(name, O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
111 fSize = lseek(h,0,SEEK_END);
112 requiredSize = BLOCKS_PER_HANDLE * BLOCK_SIZE;
113 if(fSize < requiredSize){
114 for(i = 0; i < BLOCKS_PER_HANDLE; i++)
115 if(write(h,dummyBuffer,BLOCK_SIZE) != BLOCK_SIZE)
125 static int CheckInit(void)
127 static int initialised = 0;
142 remaining_ops = (rand() % 1000) * 5;
143 memset(dummyBuffer,0xff,sizeof(dummyBuffer));
147 filedisk.nBlocks = SIZE_IN_MB * BLOCKS_PER_MB;
149 for(i = 0; i < MAX_HANDLES; i++)
150 filedisk.handle[i] = -1;
152 for(i = 0,blk = 0; blk < filedisk.nBlocks; blk+=BLOCKS_PER_HANDLE,i++)
153 filedisk.handle[i] = GetBlockFileHandle(i);
160 int yflash2_GetNumberOfBlocks(void)
164 return filedisk.nBlocks;
168 int yaffs_check_all_ff(const u8 *ptr, int n)
173 if(*ptr!=0xFF) return 0;
180 static int yflash2_WriteChunk(struct yaffs_dev *dev, int nand_chunk,
181 const u8 *data, int data_len,
182 const u8 *oob, int oob_len)
184 int retval = YAFFS_OK;
191 if (data && data_len) {
192 pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
193 h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
194 lseek(h,pos,SEEK_SET);
195 nwritten = write(h,data,data_len);
196 if(nwritten != data_len)
200 if (oob && oob_len) {
201 pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE;
202 h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
203 lseek(h,pos,SEEK_SET);
204 nwritten = write(h,oob,oob_len);
205 if(nwritten != oob_len)
209 yflash2_MaybePowerFail(nand_chunk,3);
214 static int yflash2_ReadChunk(struct yaffs_dev *dev, int nand_chunk,
215 u8 *data, int data_len,
216 u8 *oob, int oob_len,
217 enum yaffs_ecc_result *ecc_result)
219 int retval = YAFFS_OK;
226 if (data && data_len) {
227 pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
228 h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
229 lseek(h,pos,SEEK_SET);
230 nread = read(h,data,data_len);
231 if(nread != data_len)
235 if (oob && oob_len) {
236 pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE;
237 h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
238 lseek(h,pos,SEEK_SET);
239 nread = read(h,oob,oob_len);
245 *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
250 static int yflash2_EraseBlock(struct yaffs_dev *dev, int block_no)
257 if(block_no < 0 || block_no >= filedisk.nBlocks)
259 yaffs_trace(YAFFS_TRACE_ALWAYS,"Attempt to erase non-existant block %d",block_no);
272 h = filedisk.handle[(block_no / ( BLOCKS_PER_HANDLE))];
273 lseek(h,((block_no % BLOCKS_PER_HANDLE) * dev->param.chunks_per_block) * PAGE_SIZE,SEEK_SET);
274 for(i = 0; i < dev->param.chunks_per_block; i++)
276 write(h,pg,PAGE_SIZE);
278 pos = lseek(h, 0,SEEK_CUR);
284 static int yflash2_MarkBad(struct yaffs_dev *dev, int block_no)
289 struct yaffs_packed_tags2 pt;
293 memset(&pt,0,sizeof(pt));
294 h = filedisk.handle[(block_no / ( BLOCKS_PER_HANDLE))];
295 lseek(h,((block_no % BLOCKS_PER_HANDLE) * dev->param.chunks_per_block) * PAGE_SIZE + PAGE_DATA_SIZE,SEEK_SET);
296 written = write(h,&pt,sizeof(pt));
298 if(written != sizeof(pt))
305 static int yflash2_CheckBad(struct yaffs_dev *dev, int block_no)
313 static int yflash2_Initialise(struct yaffs_dev *dev)
322 void yflash2_install_drv(struct yaffs_dev *dev)
324 struct yaffs_param *param = &dev->param;
325 struct yaffs_driver *drv = &dev->drv;
327 drv->drv_write_chunk_fn = yflash2_WriteChunk;
328 drv->drv_read_chunk_fn = yflash2_ReadChunk;
329 drv->drv_erase_fn = yflash2_EraseBlock;
330 drv->drv_mark_bad_fn = yflash2_MarkBad;
331 drv->drv_check_bad_fn = yflash2_CheckBad;
332 drv->drv_initialise_fn = yflash2_Initialise;
335 param->total_bytes_per_chunk = 2048;
336 param->chunks_per_block = 64;
337 param->start_block = 0;
338 param->end_block = yflash2_GetNumberOfBlocks()-1;
339 param->is_yaffs2 = 1;
340 param->use_nand_ecc=1;