| 1 |
62 |
marcus.erl |
/*
|
| 2 |
|
|
* Linux driver for SSFDC Flash Translation Layer (Read only)
|
| 3 |
|
|
* (c) 2005 Eptar srl
|
| 4 |
|
|
* Author: Claudio Lanconelli <lanconelli.claudio@eptar.com>
|
| 5 |
|
|
*
|
| 6 |
|
|
* Based on NTFL and MTDBLOCK_RO drivers
|
| 7 |
|
|
*
|
| 8 |
|
|
* This program is free software; you can redistribute it and/or modify
|
| 9 |
|
|
* it under the terms of the GNU General Public License version 2 as
|
| 10 |
|
|
* published by the Free Software Foundation.
|
| 11 |
|
|
*/
|
| 12 |
|
|
|
| 13 |
|
|
#include <linux/kernel.h>
|
| 14 |
|
|
#include <linux/module.h>
|
| 15 |
|
|
#include <linux/init.h>
|
| 16 |
|
|
#include <linux/slab.h>
|
| 17 |
|
|
#include <linux/hdreg.h>
|
| 18 |
|
|
#include <linux/mtd/mtd.h>
|
| 19 |
|
|
#include <linux/mtd/nand.h>
|
| 20 |
|
|
#include <linux/mtd/blktrans.h>
|
| 21 |
|
|
|
| 22 |
|
|
struct ssfdcr_record {
|
| 23 |
|
|
struct mtd_blktrans_dev mbd;
|
| 24 |
|
|
int usecount;
|
| 25 |
|
|
unsigned char heads;
|
| 26 |
|
|
unsigned char sectors;
|
| 27 |
|
|
unsigned short cylinders;
|
| 28 |
|
|
int cis_block; /* block n. containing CIS/IDI */
|
| 29 |
|
|
int erase_size; /* phys_block_size */
|
| 30 |
|
|
unsigned short *logic_block_map; /* all zones (max 8192 phys blocks on
|
| 31 |
|
|
the 128MiB) */
|
| 32 |
|
|
int map_len; /* n. phys_blocks on the card */
|
| 33 |
|
|
};
|
| 34 |
|
|
|
| 35 |
|
|
#define SSFDCR_MAJOR 257
|
| 36 |
|
|
#define SSFDCR_PARTN_BITS 3
|
| 37 |
|
|
|
| 38 |
|
|
#define SECTOR_SIZE 512
|
| 39 |
|
|
#define SECTOR_SHIFT 9
|
| 40 |
|
|
#define OOB_SIZE 16
|
| 41 |
|
|
|
| 42 |
|
|
#define MAX_LOGIC_BLK_PER_ZONE 1000
|
| 43 |
|
|
#define MAX_PHYS_BLK_PER_ZONE 1024
|
| 44 |
|
|
|
| 45 |
|
|
#define KiB(x) ( (x) * 1024L )
|
| 46 |
|
|
#define MiB(x) ( KiB(x) * 1024L )
|
| 47 |
|
|
|
| 48 |
|
|
/** CHS Table
|
| 49 |
|
|
1MiB 2MiB 4MiB 8MiB 16MiB 32MiB 64MiB 128MiB
|
| 50 |
|
|
NCylinder 125 125 250 250 500 500 500 500
|
| 51 |
|
|
NHead 4 4 4 4 4 8 8 16
|
| 52 |
|
|
NSector 4 8 8 16 16 16 32 32
|
| 53 |
|
|
SumSector 2,000 4,000 8,000 16,000 32,000 64,000 128,000 256,000
|
| 54 |
|
|
SectorSize 512 512 512 512 512 512 512 512
|
| 55 |
|
|
**/
|
| 56 |
|
|
|
| 57 |
|
|
typedef struct {
|
| 58 |
|
|
unsigned long size;
|
| 59 |
|
|
unsigned short cyl;
|
| 60 |
|
|
unsigned char head;
|
| 61 |
|
|
unsigned char sec;
|
| 62 |
|
|
} chs_entry_t;
|
| 63 |
|
|
|
| 64 |
|
|
/* Must be ordered by size */
|
| 65 |
|
|
static const chs_entry_t chs_table[] = {
|
| 66 |
|
|
{ MiB( 1), 125, 4, 4 },
|
| 67 |
|
|
{ MiB( 2), 125, 4, 8 },
|
| 68 |
|
|
{ MiB( 4), 250, 4, 8 },
|
| 69 |
|
|
{ MiB( 8), 250, 4, 16 },
|
| 70 |
|
|
{ MiB( 16), 500, 4, 16 },
|
| 71 |
|
|
{ MiB( 32), 500, 8, 16 },
|
| 72 |
|
|
{ MiB( 64), 500, 8, 32 },
|
| 73 |
|
|
{ MiB(128), 500, 16, 32 },
|
| 74 |
|
|
{ 0 },
|
| 75 |
|
|
};
|
| 76 |
|
|
|
| 77 |
|
|
static int get_chs(unsigned long size, unsigned short *cyl, unsigned char *head,
|
| 78 |
|
|
unsigned char *sec)
|
| 79 |
|
|
{
|
| 80 |
|
|
int k;
|
| 81 |
|
|
int found = 0;
|
| 82 |
|
|
|
| 83 |
|
|
k = 0;
|
| 84 |
|
|
while (chs_table[k].size > 0 && size > chs_table[k].size)
|
| 85 |
|
|
k++;
|
| 86 |
|
|
|
| 87 |
|
|
if (chs_table[k].size > 0) {
|
| 88 |
|
|
if (cyl)
|
| 89 |
|
|
*cyl = chs_table[k].cyl;
|
| 90 |
|
|
if (head)
|
| 91 |
|
|
*head = chs_table[k].head;
|
| 92 |
|
|
if (sec)
|
| 93 |
|
|
*sec = chs_table[k].sec;
|
| 94 |
|
|
found = 1;
|
| 95 |
|
|
}
|
| 96 |
|
|
|
| 97 |
|
|
return found;
|
| 98 |
|
|
}
|
| 99 |
|
|
|
| 100 |
|
|
/* These bytes are the signature for the CIS/IDI sector */
|
| 101 |
|
|
static const uint8_t cis_numbers[] = {
|
| 102 |
|
|
0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
|
| 103 |
|
|
};
|
| 104 |
|
|
|
| 105 |
|
|
/* Read and check for a valid CIS sector */
|
| 106 |
|
|
static int get_valid_cis_sector(struct mtd_info *mtd)
|
| 107 |
|
|
{
|
| 108 |
|
|
int ret, k, cis_sector;
|
| 109 |
|
|
size_t retlen;
|
| 110 |
|
|
loff_t offset;
|
| 111 |
|
|
uint8_t *sect_buf;
|
| 112 |
|
|
|
| 113 |
|
|
cis_sector = -1;
|
| 114 |
|
|
|
| 115 |
|
|
sect_buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
|
| 116 |
|
|
if (!sect_buf)
|
| 117 |
|
|
goto out;
|
| 118 |
|
|
|
| 119 |
|
|
/*
|
| 120 |
|
|
* Look for CIS/IDI sector on the first GOOD block (give up after 4 bad
|
| 121 |
|
|
* blocks). If the first good block doesn't contain CIS number the flash
|
| 122 |
|
|
* is not SSFDC formatted
|
| 123 |
|
|
*/
|
| 124 |
|
|
for (k = 0, offset = 0; k < 4; k++, offset += mtd->erasesize) {
|
| 125 |
|
|
if (!mtd->block_isbad(mtd, offset)) {
|
| 126 |
|
|
ret = mtd->read(mtd, offset, SECTOR_SIZE, &retlen,
|
| 127 |
|
|
sect_buf);
|
| 128 |
|
|
|
| 129 |
|
|
/* CIS pattern match on the sector buffer */
|
| 130 |
|
|
if (ret < 0 || retlen != SECTOR_SIZE) {
|
| 131 |
|
|
printk(KERN_WARNING
|
| 132 |
|
|
"SSFDC_RO:can't read CIS/IDI sector\n");
|
| 133 |
|
|
} else if (!memcmp(sect_buf, cis_numbers,
|
| 134 |
|
|
sizeof(cis_numbers))) {
|
| 135 |
|
|
/* Found */
|
| 136 |
|
|
cis_sector = (int)(offset >> SECTOR_SHIFT);
|
| 137 |
|
|
} else {
|
| 138 |
|
|
DEBUG(MTD_DEBUG_LEVEL1,
|
| 139 |
|
|
"SSFDC_RO: CIS/IDI sector not found"
|
| 140 |
|
|
" on %s (mtd%d)\n", mtd->name,
|
| 141 |
|
|
mtd->index);
|
| 142 |
|
|
}
|
| 143 |
|
|
break;
|
| 144 |
|
|
}
|
| 145 |
|
|
}
|
| 146 |
|
|
|
| 147 |
|
|
kfree(sect_buf);
|
| 148 |
|
|
out:
|
| 149 |
|
|
return cis_sector;
|
| 150 |
|
|
}
|
| 151 |
|
|
|
| 152 |
|
|
/* Read physical sector (wrapper to MTD_READ) */
|
| 153 |
|
|
static int read_physical_sector(struct mtd_info *mtd, uint8_t *sect_buf,
|
| 154 |
|
|
int sect_no)
|
| 155 |
|
|
{
|
| 156 |
|
|
int ret;
|
| 157 |
|
|
size_t retlen;
|
| 158 |
|
|
loff_t offset = (loff_t)sect_no << SECTOR_SHIFT;
|
| 159 |
|
|
|
| 160 |
|
|
ret = mtd->read(mtd, offset, SECTOR_SIZE, &retlen, sect_buf);
|
| 161 |
|
|
if (ret < 0 || retlen != SECTOR_SIZE)
|
| 162 |
|
|
return -1;
|
| 163 |
|
|
|
| 164 |
|
|
return 0;
|
| 165 |
|
|
}
|
| 166 |
|
|
|
| 167 |
|
|
/* Read redundancy area (wrapper to MTD_READ_OOB */
|
| 168 |
|
|
static int read_raw_oob(struct mtd_info *mtd, loff_t offs, uint8_t *buf)
|
| 169 |
|
|
{
|
| 170 |
|
|
struct mtd_oob_ops ops;
|
| 171 |
|
|
int ret;
|
| 172 |
|
|
|
| 173 |
|
|
ops.mode = MTD_OOB_RAW;
|
| 174 |
|
|
ops.ooboffs = 0;
|
| 175 |
|
|
ops.ooblen = OOB_SIZE;
|
| 176 |
|
|
ops.oobbuf = buf;
|
| 177 |
|
|
ops.datbuf = NULL;
|
| 178 |
|
|
|
| 179 |
|
|
ret = mtd->read_oob(mtd, offs, &ops);
|
| 180 |
|
|
if (ret < 0 || ops.oobretlen != OOB_SIZE)
|
| 181 |
|
|
return -1;
|
| 182 |
|
|
|
| 183 |
|
|
return 0;
|
| 184 |
|
|
}
|
| 185 |
|
|
|
| 186 |
|
|
/* Parity calculator on a word of n bit size */
|
| 187 |
|
|
static int get_parity(int number, int size)
|
| 188 |
|
|
{
|
| 189 |
|
|
int k;
|
| 190 |
|
|
int parity;
|
| 191 |
|
|
|
| 192 |
|
|
parity = 1;
|
| 193 |
|
|
for (k = 0; k < size; k++) {
|
| 194 |
|
|
parity += (number >> k);
|
| 195 |
|
|
parity &= 1;
|
| 196 |
|
|
}
|
| 197 |
|
|
return parity;
|
| 198 |
|
|
}
|
| 199 |
|
|
|
| 200 |
|
|
/* Read and validate the logical block address field stored in the OOB */
|
| 201 |
|
|
static int get_logical_address(uint8_t *oob_buf)
|
| 202 |
|
|
{
|
| 203 |
|
|
int block_address, parity;
|
| 204 |
|
|
int offset[2] = {6, 11}; /* offset of the 2 address fields within OOB */
|
| 205 |
|
|
int j;
|
| 206 |
|
|
int ok = 0;
|
| 207 |
|
|
|
| 208 |
|
|
/*
|
| 209 |
|
|
* Look for the first valid logical address
|
| 210 |
|
|
* Valid address has fixed pattern on most significant bits and
|
| 211 |
|
|
* parity check
|
| 212 |
|
|
*/
|
| 213 |
|
|
for (j = 0; j < ARRAY_SIZE(offset); j++) {
|
| 214 |
|
|
block_address = ((int)oob_buf[offset[j]] << 8) |
|
| 215 |
|
|
oob_buf[offset[j]+1];
|
| 216 |
|
|
|
| 217 |
|
|
/* Check for the signature bits in the address field (MSBits) */
|
| 218 |
|
|
if ((block_address & ~0x7FF) == 0x1000) {
|
| 219 |
|
|
parity = block_address & 0x01;
|
| 220 |
|
|
block_address &= 0x7FF;
|
| 221 |
|
|
block_address >>= 1;
|
| 222 |
|
|
|
| 223 |
|
|
if (get_parity(block_address, 10) != parity) {
|
| 224 |
|
|
DEBUG(MTD_DEBUG_LEVEL0,
|
| 225 |
|
|
"SSFDC_RO: logical address field%d"
|
| 226 |
|
|
"parity error(0x%04X)\n", j+1,
|
| 227 |
|
|
block_address);
|
| 228 |
|
|
} else {
|
| 229 |
|
|
ok = 1;
|
| 230 |
|
|
break;
|
| 231 |
|
|
}
|
| 232 |
|
|
}
|
| 233 |
|
|
}
|
| 234 |
|
|
|
| 235 |
|
|
if (!ok)
|
| 236 |
|
|
block_address = -2;
|
| 237 |
|
|
|
| 238 |
|
|
DEBUG(MTD_DEBUG_LEVEL3, "SSFDC_RO: get_logical_address() %d\n",
|
| 239 |
|
|
block_address);
|
| 240 |
|
|
|
| 241 |
|
|
return block_address;
|
| 242 |
|
|
}
|
| 243 |
|
|
|
| 244 |
|
|
/* Build the logic block map */
|
| 245 |
|
|
static int build_logical_block_map(struct ssfdcr_record *ssfdc)
|
| 246 |
|
|
{
|
| 247 |
|
|
unsigned long offset;
|
| 248 |
|
|
uint8_t oob_buf[OOB_SIZE];
|
| 249 |
|
|
int ret, block_address, phys_block;
|
| 250 |
|
|
struct mtd_info *mtd = ssfdc->mbd.mtd;
|
| 251 |
|
|
|
| 252 |
|
|
DEBUG(MTD_DEBUG_LEVEL1, "SSFDC_RO: build_block_map() nblks=%d (%luK)\n",
|
| 253 |
|
|
ssfdc->map_len,
|
| 254 |
|
|
(unsigned long)ssfdc->map_len * ssfdc->erase_size / 1024);
|
| 255 |
|
|
|
| 256 |
|
|
/* Scan every physical block, skip CIS block */
|
| 257 |
|
|
for (phys_block = ssfdc->cis_block + 1; phys_block < ssfdc->map_len;
|
| 258 |
|
|
phys_block++) {
|
| 259 |
|
|
offset = (unsigned long)phys_block * ssfdc->erase_size;
|
| 260 |
|
|
if (mtd->block_isbad(mtd, offset))
|
| 261 |
|
|
continue; /* skip bad blocks */
|
| 262 |
|
|
|
| 263 |
|
|
ret = read_raw_oob(mtd, offset, oob_buf);
|
| 264 |
|
|
if (ret < 0) {
|
| 265 |
|
|
DEBUG(MTD_DEBUG_LEVEL0,
|
| 266 |
|
|
"SSFDC_RO: mtd read_oob() failed at %lu\n",
|
| 267 |
|
|
offset);
|
| 268 |
|
|
return -1;
|
| 269 |
|
|
}
|
| 270 |
|
|
block_address = get_logical_address(oob_buf);
|
| 271 |
|
|
|
| 272 |
|
|
/* Skip invalid addresses */
|
| 273 |
|
|
if (block_address >= 0 &&
|
| 274 |
|
|
block_address < MAX_LOGIC_BLK_PER_ZONE) {
|
| 275 |
|
|
int zone_index;
|
| 276 |
|
|
|
| 277 |
|
|
zone_index = phys_block / MAX_PHYS_BLK_PER_ZONE;
|
| 278 |
|
|
block_address += zone_index * MAX_LOGIC_BLK_PER_ZONE;
|
| 279 |
|
|
ssfdc->logic_block_map[block_address] =
|
| 280 |
|
|
(unsigned short)phys_block;
|
| 281 |
|
|
|
| 282 |
|
|
DEBUG(MTD_DEBUG_LEVEL2,
|
| 283 |
|
|
"SSFDC_RO: build_block_map() phys_block=%d,"
|
| 284 |
|
|
"logic_block_addr=%d, zone=%d\n",
|
| 285 |
|
|
phys_block, block_address, zone_index);
|
| 286 |
|
|
}
|
| 287 |
|
|
}
|
| 288 |
|
|
return 0;
|
| 289 |
|
|
}
|
| 290 |
|
|
|
| 291 |
|
|
static void ssfdcr_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
|
| 292 |
|
|
{
|
| 293 |
|
|
struct ssfdcr_record *ssfdc;
|
| 294 |
|
|
int cis_sector;
|
| 295 |
|
|
|
| 296 |
|
|
/* Check for small page NAND flash */
|
| 297 |
|
|
if (mtd->type != MTD_NANDFLASH || mtd->oobsize != OOB_SIZE)
|
| 298 |
|
|
return;
|
| 299 |
|
|
|
| 300 |
|
|
/* Check for SSDFC format by reading CIS/IDI sector */
|
| 301 |
|
|
cis_sector = get_valid_cis_sector(mtd);
|
| 302 |
|
|
if (cis_sector == -1)
|
| 303 |
|
|
return;
|
| 304 |
|
|
|
| 305 |
|
|
ssfdc = kzalloc(sizeof(struct ssfdcr_record), GFP_KERNEL);
|
| 306 |
|
|
if (!ssfdc) {
|
| 307 |
|
|
printk(KERN_WARNING
|
| 308 |
|
|
"SSFDC_RO: out of memory for data structures\n");
|
| 309 |
|
|
return;
|
| 310 |
|
|
}
|
| 311 |
|
|
|
| 312 |
|
|
ssfdc->mbd.mtd = mtd;
|
| 313 |
|
|
ssfdc->mbd.devnum = -1;
|
| 314 |
|
|
ssfdc->mbd.tr = tr;
|
| 315 |
|
|
ssfdc->mbd.readonly = 1;
|
| 316 |
|
|
|
| 317 |
|
|
ssfdc->cis_block = cis_sector / (mtd->erasesize >> SECTOR_SHIFT);
|
| 318 |
|
|
ssfdc->erase_size = mtd->erasesize;
|
| 319 |
|
|
ssfdc->map_len = mtd->size / mtd->erasesize;
|
| 320 |
|
|
|
| 321 |
|
|
DEBUG(MTD_DEBUG_LEVEL1,
|
| 322 |
|
|
"SSFDC_RO: cis_block=%d,erase_size=%d,map_len=%d,n_zones=%d\n",
|
| 323 |
|
|
ssfdc->cis_block, ssfdc->erase_size, ssfdc->map_len,
|
| 324 |
|
|
(ssfdc->map_len + MAX_PHYS_BLK_PER_ZONE - 1) /
|
| 325 |
|
|
MAX_PHYS_BLK_PER_ZONE);
|
| 326 |
|
|
|
| 327 |
|
|
/* Set geometry */
|
| 328 |
|
|
ssfdc->heads = 16;
|
| 329 |
|
|
ssfdc->sectors = 32;
|
| 330 |
|
|
get_chs(mtd->size, NULL, &ssfdc->heads, &ssfdc->sectors);
|
| 331 |
|
|
ssfdc->cylinders = (unsigned short)((mtd->size >> SECTOR_SHIFT) /
|
| 332 |
|
|
((long)ssfdc->sectors * (long)ssfdc->heads));
|
| 333 |
|
|
|
| 334 |
|
|
DEBUG(MTD_DEBUG_LEVEL1, "SSFDC_RO: using C:%d H:%d S:%d == %ld sects\n",
|
| 335 |
|
|
ssfdc->cylinders, ssfdc->heads , ssfdc->sectors,
|
| 336 |
|
|
(long)ssfdc->cylinders * (long)ssfdc->heads *
|
| 337 |
|
|
(long)ssfdc->sectors);
|
| 338 |
|
|
|
| 339 |
|
|
ssfdc->mbd.size = (long)ssfdc->heads * (long)ssfdc->cylinders *
|
| 340 |
|
|
(long)ssfdc->sectors;
|
| 341 |
|
|
|
| 342 |
|
|
/* Allocate logical block map */
|
| 343 |
|
|
ssfdc->logic_block_map = kmalloc(sizeof(ssfdc->logic_block_map[0]) *
|
| 344 |
|
|
ssfdc->map_len, GFP_KERNEL);
|
| 345 |
|
|
if (!ssfdc->logic_block_map) {
|
| 346 |
|
|
printk(KERN_WARNING
|
| 347 |
|
|
"SSFDC_RO: out of memory for data structures\n");
|
| 348 |
|
|
goto out_err;
|
| 349 |
|
|
}
|
| 350 |
|
|
memset(ssfdc->logic_block_map, 0xff, sizeof(ssfdc->logic_block_map[0]) *
|
| 351 |
|
|
ssfdc->map_len);
|
| 352 |
|
|
|
| 353 |
|
|
/* Build logical block map */
|
| 354 |
|
|
if (build_logical_block_map(ssfdc) < 0)
|
| 355 |
|
|
goto out_err;
|
| 356 |
|
|
|
| 357 |
|
|
/* Register device + partitions */
|
| 358 |
|
|
if (add_mtd_blktrans_dev(&ssfdc->mbd))
|
| 359 |
|
|
goto out_err;
|
| 360 |
|
|
|
| 361 |
|
|
printk(KERN_INFO "SSFDC_RO: Found ssfdc%c on mtd%d (%s)\n",
|
| 362 |
|
|
ssfdc->mbd.devnum + 'a', mtd->index, mtd->name);
|
| 363 |
|
|
return;
|
| 364 |
|
|
|
| 365 |
|
|
out_err:
|
| 366 |
|
|
kfree(ssfdc->logic_block_map);
|
| 367 |
|
|
kfree(ssfdc);
|
| 368 |
|
|
}
|
| 369 |
|
|
|
| 370 |
|
|
static void ssfdcr_remove_dev(struct mtd_blktrans_dev *dev)
|
| 371 |
|
|
{
|
| 372 |
|
|
struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev;
|
| 373 |
|
|
|
| 374 |
|
|
DEBUG(MTD_DEBUG_LEVEL1, "SSFDC_RO: remove_dev (i=%d)\n", dev->devnum);
|
| 375 |
|
|
|
| 376 |
|
|
del_mtd_blktrans_dev(dev);
|
| 377 |
|
|
kfree(ssfdc->logic_block_map);
|
| 378 |
|
|
kfree(ssfdc);
|
| 379 |
|
|
}
|
| 380 |
|
|
|
| 381 |
|
|
static int ssfdcr_readsect(struct mtd_blktrans_dev *dev,
|
| 382 |
|
|
unsigned long logic_sect_no, char *buf)
|
| 383 |
|
|
{
|
| 384 |
|
|
struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev;
|
| 385 |
|
|
int sectors_per_block, offset, block_address;
|
| 386 |
|
|
|
| 387 |
|
|
sectors_per_block = ssfdc->erase_size >> SECTOR_SHIFT;
|
| 388 |
|
|
offset = (int)(logic_sect_no % sectors_per_block);
|
| 389 |
|
|
block_address = (int)(logic_sect_no / sectors_per_block);
|
| 390 |
|
|
|
| 391 |
|
|
DEBUG(MTD_DEBUG_LEVEL3,
|
| 392 |
|
|
"SSFDC_RO: ssfdcr_readsect(%lu) sec_per_blk=%d, ofst=%d,"
|
| 393 |
|
|
" block_addr=%d\n", logic_sect_no, sectors_per_block, offset,
|
| 394 |
|
|
block_address);
|
| 395 |
|
|
|
| 396 |
|
|
if (block_address >= ssfdc->map_len)
|
| 397 |
|
|
BUG();
|
| 398 |
|
|
|
| 399 |
|
|
block_address = ssfdc->logic_block_map[block_address];
|
| 400 |
|
|
|
| 401 |
|
|
DEBUG(MTD_DEBUG_LEVEL3,
|
| 402 |
|
|
"SSFDC_RO: ssfdcr_readsect() phys_block_addr=%d\n",
|
| 403 |
|
|
block_address);
|
| 404 |
|
|
|
| 405 |
|
|
if (block_address < 0xffff) {
|
| 406 |
|
|
unsigned long sect_no;
|
| 407 |
|
|
|
| 408 |
|
|
sect_no = (unsigned long)block_address * sectors_per_block +
|
| 409 |
|
|
offset;
|
| 410 |
|
|
|
| 411 |
|
|
DEBUG(MTD_DEBUG_LEVEL3,
|
| 412 |
|
|
"SSFDC_RO: ssfdcr_readsect() phys_sect_no=%lu\n",
|
| 413 |
|
|
sect_no);
|
| 414 |
|
|
|
| 415 |
|
|
if (read_physical_sector(ssfdc->mbd.mtd, buf, sect_no) < 0)
|
| 416 |
|
|
return -EIO;
|
| 417 |
|
|
} else {
|
| 418 |
|
|
memset(buf, 0xff, SECTOR_SIZE);
|
| 419 |
|
|
}
|
| 420 |
|
|
|
| 421 |
|
|
return 0;
|
| 422 |
|
|
}
|
| 423 |
|
|
|
| 424 |
|
|
static int ssfdcr_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
|
| 425 |
|
|
{
|
| 426 |
|
|
struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev;
|
| 427 |
|
|
|
| 428 |
|
|
DEBUG(MTD_DEBUG_LEVEL1, "SSFDC_RO: ssfdcr_getgeo() C=%d, H=%d, S=%d\n",
|
| 429 |
|
|
ssfdc->cylinders, ssfdc->heads, ssfdc->sectors);
|
| 430 |
|
|
|
| 431 |
|
|
geo->heads = ssfdc->heads;
|
| 432 |
|
|
geo->sectors = ssfdc->sectors;
|
| 433 |
|
|
geo->cylinders = ssfdc->cylinders;
|
| 434 |
|
|
|
| 435 |
|
|
return 0;
|
| 436 |
|
|
}
|
| 437 |
|
|
|
| 438 |
|
|
/****************************************************************************
|
| 439 |
|
|
*
|
| 440 |
|
|
* Module stuff
|
| 441 |
|
|
*
|
| 442 |
|
|
****************************************************************************/
|
| 443 |
|
|
|
| 444 |
|
|
static struct mtd_blktrans_ops ssfdcr_tr = {
|
| 445 |
|
|
.name = "ssfdc",
|
| 446 |
|
|
.major = SSFDCR_MAJOR,
|
| 447 |
|
|
.part_bits = SSFDCR_PARTN_BITS,
|
| 448 |
|
|
.blksize = SECTOR_SIZE,
|
| 449 |
|
|
.getgeo = ssfdcr_getgeo,
|
| 450 |
|
|
.readsect = ssfdcr_readsect,
|
| 451 |
|
|
.add_mtd = ssfdcr_add_mtd,
|
| 452 |
|
|
.remove_dev = ssfdcr_remove_dev,
|
| 453 |
|
|
.owner = THIS_MODULE,
|
| 454 |
|
|
};
|
| 455 |
|
|
|
| 456 |
|
|
static int __init init_ssfdcr(void)
|
| 457 |
|
|
{
|
| 458 |
|
|
printk(KERN_INFO "SSFDC read-only Flash Translation layer\n");
|
| 459 |
|
|
|
| 460 |
|
|
return register_mtd_blktrans(&ssfdcr_tr);
|
| 461 |
|
|
}
|
| 462 |
|
|
|
| 463 |
|
|
static void __exit cleanup_ssfdcr(void)
|
| 464 |
|
|
{
|
| 465 |
|
|
deregister_mtd_blktrans(&ssfdcr_tr);
|
| 466 |
|
|
}
|
| 467 |
|
|
|
| 468 |
|
|
module_init(init_ssfdcr);
|
| 469 |
|
|
module_exit(cleanup_ssfdcr);
|
| 470 |
|
|
|
| 471 |
|
|
MODULE_LICENSE("GPL");
|
| 472 |
|
|
MODULE_AUTHOR("Claudio Lanconelli <lanconelli.claudio@eptar.com>");
|
| 473 |
|
|
MODULE_DESCRIPTION("Flash Translation Layer for read-only SSFDC SmartMedia card");
|
