--- /dev/null
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This provides a YAFFS nand emulation on a file for emulating 2kB pages.
+ * This is only intended as test code to test persistence etc.
+ */
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_flashif2.h"
+#include "yaffs_guts.h"
+#include "yaffs_fileem2k.h"
+#include "yaffs_packedtags2.h"
+
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#if 1
+
+#define SIZE_IN_MB 32
+/* #define SIZE_IN_MB 128 */
+
+#define PAGE_DATA_SIZE (2048)
+#define PAGE_SPARE_SIZE (64)
+#define PAGE_SIZE (PAGE_DATA_SIZE + PAGE_SPARE_SIZE)
+#define PAGES_PER_BLOCK (64)
+#define BLOCK_DATA_SIZE (PAGE_DATA_SIZE * PAGES_PER_BLOCK)
+#define BLOCK_SIZE (PAGES_PER_BLOCK * (PAGE_SIZE))
+#define BLOCKS_PER_MB ((1024*1024)/BLOCK_DATA_SIZE)
+#define SIZE_IN_BLOCKS (BLOCKS_PER_MB * SIZE_IN_MB)
+
+#else
+
+#define SIZE_IN_MB 128
+#define PAGE_DATA_SIZE (512)
+#define SPARE_SIZE (16)
+#define PAGE_SIZE (PAGE_DATA_SIZE + SPARE_SIZE)
+#define PAGES_PER_BLOCK (32)
+#define BLOCK_DATA_SIZE (PAGE_SIZE * PAGES_PER_BLOCK)
+#define BLOCK_SIZE (PAGES_PER_BLOCK * (PAGE_SIZE))
+#define BLOCKS_PER_MB ((1024*1024)/BLOCK_DATA_SIZE)
+#define SIZE_IN_BLOCKS (BLOCKS_PER_MB * SIZE_IN_MB)
+
+#endif
+
+#define REPORT_ERROR 0
+
+typedef struct
+{
+ u8 data[PAGE_SIZE]; // Data + spare
+} yflash_Page;
+
+typedef struct
+{
+ yflash_Page page[PAGES_PER_BLOCK]; // The pages in the block
+
+} yflash_Block;
+
+
+
+#define MAX_HANDLES 20
+#define BLOCKS_PER_HANDLE (32*8)
+
+typedef struct
+{
+ int handle[MAX_HANDLES];
+ int nBlocks;
+} yflash_Device;
+
+static yflash_Device filedisk;
+
+int yaffs_test_partial_write = 0;
+
+extern int random_seed;
+extern int simulate_power_failure;
+static int remaining_ops;
+static int nops_so_far;
+
+int ops_multiplier;
+
+
+static void yflash2_MaybePowerFail(unsigned int nand_chunk, int failPoint)
+{
+
+ nops_so_far++;
+
+
+ remaining_ops--;
+ if(simulate_power_failure &&
+ remaining_ops < 1){
+ printf("Simulated power failure after %d operations\n",nops_so_far);
+ printf(" power failed on nand_chunk %d, at fail point %d\n",
+ nand_chunk, failPoint);
+ exit(0);
+ }
+}
+
+
+
+
+
+static u8 localBuffer[PAGE_SIZE];
+
+static char *NToName(char *buf,int n)
+{
+ sprintf(buf,"emfile-2k-%d",n);
+ return buf;
+}
+
+static char dummyBuffer[BLOCK_SIZE];
+
+static int GetBlockFileHandle(int n)
+{
+ int h;
+ int requiredSize;
+
+ char name[40];
+ NToName(name,n);
+ int fSize;
+ int i;
+
+ h = open(name, O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
+ if(h >= 0){
+ fSize = lseek(h,0,SEEK_END);
+ requiredSize = BLOCKS_PER_HANDLE * BLOCK_SIZE;
+ if(fSize < requiredSize){
+ for(i = 0; i < BLOCKS_PER_HANDLE; i++)
+ if(write(h,dummyBuffer,BLOCK_SIZE) != BLOCK_SIZE)
+ return -1;
+
+ }
+ }
+
+ return h;
+
+}
+
+static int CheckInit(void)
+{
+ static int initialised = 0;
+ int i;
+
+ int blk;
+
+
+ if(initialised)
+ {
+ return YAFFS_OK;
+ }
+
+ initialised = 1;
+
+
+ srand(random_seed);
+ remaining_ops = (rand() % 1000) * 5;
+ memset(dummyBuffer,0xff,sizeof(dummyBuffer));
+
+
+
+ filedisk.nBlocks = SIZE_IN_MB * BLOCKS_PER_MB;
+
+ for(i = 0; i < MAX_HANDLES; i++)
+ filedisk.handle[i] = -1;
+
+ for(i = 0,blk = 0; blk < filedisk.nBlocks; blk+=BLOCKS_PER_HANDLE,i++)
+ filedisk.handle[i] = GetBlockFileHandle(i);
+
+
+ return 1;
+}
+
+
+int yflash2_GetNumberOfBlocks(void)
+{
+ CheckInit();
+
+ return filedisk.nBlocks;
+}
+
+
+int yaffs_check_all_ff(const u8 *ptr, int n)
+{
+ while(n)
+ {
+ n--;
+ if(*ptr!=0xFF) return 0;
+ ptr++;
+ }
+ return 1;
+}
+
+
+static int yflash2_WriteChunk(struct yaffs_dev *dev, int nand_chunk,
+ const u8 *data, int data_len,
+ const u8 *oob, int oob_len)
+{
+ int retval = YAFFS_OK;
+ int pos;
+ int h;
+ int nwritten;
+
+ (void) dev;
+
+ if (data && data_len) {
+ pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
+ h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
+ lseek(h,pos,SEEK_SET);
+ nwritten = write(h,data,data_len);
+ if(nwritten != data_len)
+ retval = YAFFS_FAIL;
+ }
+
+ if (oob && oob_len) {
+ pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE;
+ h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
+ lseek(h,pos,SEEK_SET);
+ nwritten = write(h,oob,oob_len);
+ if(nwritten != oob_len)
+ retval = YAFFS_FAIL;
+ }
+
+ yflash2_MaybePowerFail(nand_chunk,3);
+
+ return retval;
+}
+
+static int yflash2_ReadChunk(struct yaffs_dev *dev, int nand_chunk,
+ u8 *data, int data_len,
+ u8 *oob, int oob_len,
+ enum yaffs_ecc_result *ecc_result)
+{
+ int retval = YAFFS_OK;
+ int pos;
+ int h;
+ int nread;
+
+ (void) dev;
+
+ if (data && data_len) {
+ pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
+ h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
+ lseek(h,pos,SEEK_SET);
+ nread = read(h,data,data_len);
+ if(nread != data_len)
+ retval = YAFFS_FAIL;
+ }
+
+ if (oob && oob_len) {
+ pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE;
+ h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
+ lseek(h,pos,SEEK_SET);
+ nread = read(h,oob,oob_len);
+ if(nread != oob_len)
+ retval = YAFFS_FAIL;
+ }
+
+ if (ecc_result)
+ *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+ return retval;
+}
+
+static int yflash2_EraseBlock(struct yaffs_dev *dev, int block_no)
+{
+ int i;
+ int h;
+
+ CheckInit();
+
+ if(block_no < 0 || block_no >= filedisk.nBlocks)
+ {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,"Attempt to erase non-existant block %d",block_no);
+ return YAFFS_FAIL;
+ }
+ else
+ {
+
+ u8 pg[PAGE_SIZE];
+ int syz = PAGE_SIZE;
+ int pos;
+
+ memset(pg,0xff,syz);
+
+
+ h = filedisk.handle[(block_no / ( BLOCKS_PER_HANDLE))];
+ lseek(h,((block_no % BLOCKS_PER_HANDLE) * dev->param.chunks_per_block) * PAGE_SIZE,SEEK_SET);
+ for(i = 0; i < dev->param.chunks_per_block; i++)
+ {
+ write(h,pg,PAGE_SIZE);
+ }
+ pos = lseek(h, 0,SEEK_CUR);
+
+ return YAFFS_OK;
+ }
+}
+
+static int yflash2_MarkBad(struct yaffs_dev *dev, int block_no)
+{
+ int written;
+ int h;
+
+ struct yaffs_packed_tags2 pt;
+
+ CheckInit();
+
+ memset(&pt,0,sizeof(pt));
+ h = filedisk.handle[(block_no / ( BLOCKS_PER_HANDLE))];
+ lseek(h,((block_no % BLOCKS_PER_HANDLE) * dev->param.chunks_per_block) * PAGE_SIZE + PAGE_DATA_SIZE,SEEK_SET);
+ written = write(h,&pt,sizeof(pt));
+
+ if(written != sizeof(pt))
+ return YAFFS_FAIL;
+
+ return YAFFS_OK;
+
+}
+
+static int yflash2_CheckBad(struct yaffs_dev *dev, int block_no)
+{
+ (void) dev;
+ (void) block_no;
+
+ return YAFFS_OK;
+}
+
+static int yflash2_Initialise(struct yaffs_dev *dev)
+{
+ (void) dev;
+
+ CheckInit();
+
+ return YAFFS_OK;
+}
+
+struct yaffs_dev *yflash2_install_drv(const char *name)
+{
+ struct yaffs_dev *dev = NULL;
+ struct yaffs_param *param;
+ struct yaffs_driver *drv;
+
+ dev = malloc(sizeof(*dev));
+
+ if(!dev)
+ return NULL;
+
+ memset(dev, 0, sizeof(*dev));
+
+ dev->param.name = strdup(name);
+
+ if(!dev->param.name) {
+ free(dev);
+ return NULL;
+ }
+
+ drv = &dev->drv;
+
+ drv->drv_write_chunk_fn = yflash2_WriteChunk;
+ drv->drv_read_chunk_fn = yflash2_ReadChunk;
+ drv->drv_erase_fn = yflash2_EraseBlock;
+ drv->drv_mark_bad_fn = yflash2_MarkBad;
+ drv->drv_check_bad_fn = yflash2_CheckBad;
+ drv->drv_initialise_fn = yflash2_Initialise;
+
+ param = &dev->param;
+
+ param->total_bytes_per_chunk = 2048;
+ param->chunks_per_block = 64;
+ param->start_block = 0;
+ param->end_block = yflash2_GetNumberOfBlocks()-1;
+ param->is_yaffs2 = 1;
+ param->use_nand_ecc=1;
+
+ param->n_reserved_blocks = 5;
+ param->wide_tnodes_disabled=0;
+ param->refresh_period = 1000;
+ param->n_caches = 10; // Use caches
+
+ param->enable_xattr = 1;
+
+ /* dev->driver_context is not used by this simulator */
+
+ yaffs_add_device(dev);
+
+ return dev;
+}
projects / yaffs2.git / blobdiff