1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
251197abfSClaudio Lanconelli /*
351197abfSClaudio Lanconelli * Linux driver for SSFDC Flash Translation Layer (Read only)
4a1452a37SDavid Woodhouse * © 2005 Eptar srl
551197abfSClaudio Lanconelli * Author: Claudio Lanconelli <lanconelli.claudio@eptar.com>
651197abfSClaudio Lanconelli *
751197abfSClaudio Lanconelli * Based on NTFL and MTDBLOCK_RO drivers
851197abfSClaudio Lanconelli */
951197abfSClaudio Lanconelli
1051197abfSClaudio Lanconelli #include <linux/kernel.h>
1151197abfSClaudio Lanconelli #include <linux/module.h>
1251197abfSClaudio Lanconelli #include <linux/init.h>
1351197abfSClaudio Lanconelli #include <linux/slab.h>
1451197abfSClaudio Lanconelli #include <linux/hdreg.h>
1551197abfSClaudio Lanconelli #include <linux/mtd/mtd.h>
16d4092d76SBoris Brezillon #include <linux/mtd/rawnand.h>
1751197abfSClaudio Lanconelli #include <linux/mtd/blktrans.h>
1851197abfSClaudio Lanconelli
1951197abfSClaudio Lanconelli struct ssfdcr_record {
2051197abfSClaudio Lanconelli struct mtd_blktrans_dev mbd;
2151197abfSClaudio Lanconelli unsigned char heads;
2251197abfSClaudio Lanconelli unsigned char sectors;
2351197abfSClaudio Lanconelli unsigned short cylinders;
2451197abfSClaudio Lanconelli int cis_block; /* block n. containing CIS/IDI */
2551197abfSClaudio Lanconelli int erase_size; /* phys_block_size */
2651197abfSClaudio Lanconelli unsigned short *logic_block_map; /* all zones (max 8192 phys blocks on
279a05ededSDavid Woodhouse the 128MiB) */
2851197abfSClaudio Lanconelli int map_len; /* n. phys_blocks on the card */
2951197abfSClaudio Lanconelli };
3051197abfSClaudio Lanconelli
3151197abfSClaudio Lanconelli #define SSFDCR_MAJOR 257
3251197abfSClaudio Lanconelli #define SSFDCR_PARTN_BITS 3
3351197abfSClaudio Lanconelli
3451197abfSClaudio Lanconelli #define SECTOR_SIZE 512
3551197abfSClaudio Lanconelli #define SECTOR_SHIFT 9
3651197abfSClaudio Lanconelli #define OOB_SIZE 16
3751197abfSClaudio Lanconelli
3851197abfSClaudio Lanconelli #define MAX_LOGIC_BLK_PER_ZONE 1000
3951197abfSClaudio Lanconelli #define MAX_PHYS_BLK_PER_ZONE 1024
4051197abfSClaudio Lanconelli
419a05ededSDavid Woodhouse #define KiB(x) ( (x) * 1024L )
429a05ededSDavid Woodhouse #define MiB(x) ( KiB(x) * 1024L )
4351197abfSClaudio Lanconelli
4451197abfSClaudio Lanconelli /** CHS Table
459a05ededSDavid Woodhouse 1MiB 2MiB 4MiB 8MiB 16MiB 32MiB 64MiB 128MiB
4651197abfSClaudio Lanconelli NCylinder 125 125 250 250 500 500 500 500
4751197abfSClaudio Lanconelli NHead 4 4 4 4 4 8 8 16
4851197abfSClaudio Lanconelli NSector 4 8 8 16 16 16 32 32
4951197abfSClaudio Lanconelli SumSector 2,000 4,000 8,000 16,000 32,000 64,000 128,000 256,000
5051197abfSClaudio Lanconelli SectorSize 512 512 512 512 512 512 512 512
5151197abfSClaudio Lanconelli **/
5251197abfSClaudio Lanconelli
5351197abfSClaudio Lanconelli typedef struct {
5451197abfSClaudio Lanconelli unsigned long size;
5551197abfSClaudio Lanconelli unsigned short cyl;
5651197abfSClaudio Lanconelli unsigned char head;
5751197abfSClaudio Lanconelli unsigned char sec;
5851197abfSClaudio Lanconelli } chs_entry_t;
5951197abfSClaudio Lanconelli
6051197abfSClaudio Lanconelli /* Must be ordered by size */
6151197abfSClaudio Lanconelli static const chs_entry_t chs_table[] = {
629a05ededSDavid Woodhouse { MiB( 1), 125, 4, 4 },
639a05ededSDavid Woodhouse { MiB( 2), 125, 4, 8 },
649a05ededSDavid Woodhouse { MiB( 4), 250, 4, 8 },
659a05ededSDavid Woodhouse { MiB( 8), 250, 4, 16 },
669a05ededSDavid Woodhouse { MiB( 16), 500, 4, 16 },
679a05ededSDavid Woodhouse { MiB( 32), 500, 8, 16 },
689a05ededSDavid Woodhouse { MiB( 64), 500, 8, 32 },
699a05ededSDavid Woodhouse { MiB(128), 500, 16, 32 },
7051197abfSClaudio Lanconelli { 0 },
7151197abfSClaudio Lanconelli };
7251197abfSClaudio Lanconelli
get_chs(unsigned long size,unsigned short * cyl,unsigned char * head,unsigned char * sec)7351197abfSClaudio Lanconelli static int get_chs(unsigned long size, unsigned short *cyl, unsigned char *head,
7451197abfSClaudio Lanconelli unsigned char *sec)
7551197abfSClaudio Lanconelli {
7651197abfSClaudio Lanconelli int k;
7751197abfSClaudio Lanconelli int found = 0;
7851197abfSClaudio Lanconelli
7951197abfSClaudio Lanconelli k = 0;
8051197abfSClaudio Lanconelli while (chs_table[k].size > 0 && size > chs_table[k].size)
8151197abfSClaudio Lanconelli k++;
8251197abfSClaudio Lanconelli
8351197abfSClaudio Lanconelli if (chs_table[k].size > 0) {
8451197abfSClaudio Lanconelli if (cyl)
8551197abfSClaudio Lanconelli *cyl = chs_table[k].cyl;
8651197abfSClaudio Lanconelli if (head)
8751197abfSClaudio Lanconelli *head = chs_table[k].head;
8851197abfSClaudio Lanconelli if (sec)
8951197abfSClaudio Lanconelli *sec = chs_table[k].sec;
9051197abfSClaudio Lanconelli found = 1;
9151197abfSClaudio Lanconelli }
9251197abfSClaudio Lanconelli
9351197abfSClaudio Lanconelli return found;
9451197abfSClaudio Lanconelli }
9551197abfSClaudio Lanconelli
9651197abfSClaudio Lanconelli /* These bytes are the signature for the CIS/IDI sector */
9751197abfSClaudio Lanconelli static const uint8_t cis_numbers[] = {
9851197abfSClaudio Lanconelli 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
9951197abfSClaudio Lanconelli };
10051197abfSClaudio Lanconelli
10151197abfSClaudio Lanconelli /* Read and check for a valid CIS sector */
get_valid_cis_sector(struct mtd_info * mtd)10251197abfSClaudio Lanconelli static int get_valid_cis_sector(struct mtd_info *mtd)
10351197abfSClaudio Lanconelli {
10451197abfSClaudio Lanconelli int ret, k, cis_sector;
10551197abfSClaudio Lanconelli size_t retlen;
10651197abfSClaudio Lanconelli loff_t offset;
1079a05ededSDavid Woodhouse uint8_t *sect_buf;
1089a05ededSDavid Woodhouse
1099a05ededSDavid Woodhouse cis_sector = -1;
1109a05ededSDavid Woodhouse
1119a05ededSDavid Woodhouse sect_buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
1129a05ededSDavid Woodhouse if (!sect_buf)
1139a05ededSDavid Woodhouse goto out;
11451197abfSClaudio Lanconelli
11551197abfSClaudio Lanconelli /*
11651197abfSClaudio Lanconelli * Look for CIS/IDI sector on the first GOOD block (give up after 4 bad
11751197abfSClaudio Lanconelli * blocks). If the first good block doesn't contain CIS number the flash
11851197abfSClaudio Lanconelli * is not SSFDC formatted
11951197abfSClaudio Lanconelli */
12051197abfSClaudio Lanconelli for (k = 0, offset = 0; k < 4; k++, offset += mtd->erasesize) {
1217086c19dSArtem Bityutskiy if (mtd_block_isbad(mtd, offset)) {
122329ad399SArtem Bityutskiy ret = mtd_read(mtd, offset, SECTOR_SIZE, &retlen,
12351197abfSClaudio Lanconelli sect_buf);
12451197abfSClaudio Lanconelli
12551197abfSClaudio Lanconelli /* CIS pattern match on the sector buffer */
12651197abfSClaudio Lanconelli if (ret < 0 || retlen != SECTOR_SIZE) {
12751197abfSClaudio Lanconelli printk(KERN_WARNING
12851197abfSClaudio Lanconelli "SSFDC_RO:can't read CIS/IDI sector\n");
12951197abfSClaudio Lanconelli } else if (!memcmp(sect_buf, cis_numbers,
13051197abfSClaudio Lanconelli sizeof(cis_numbers))) {
13151197abfSClaudio Lanconelli /* Found */
13251197abfSClaudio Lanconelli cis_sector = (int)(offset >> SECTOR_SHIFT);
13351197abfSClaudio Lanconelli } else {
134289c0522SBrian Norris pr_debug("SSFDC_RO: CIS/IDI sector not found"
13551197abfSClaudio Lanconelli " on %s (mtd%d)\n", mtd->name,
13651197abfSClaudio Lanconelli mtd->index);
13751197abfSClaudio Lanconelli }
13851197abfSClaudio Lanconelli break;
13951197abfSClaudio Lanconelli }
14051197abfSClaudio Lanconelli }
14151197abfSClaudio Lanconelli
1429a05ededSDavid Woodhouse kfree(sect_buf);
1439a05ededSDavid Woodhouse out:
14451197abfSClaudio Lanconelli return cis_sector;
14551197abfSClaudio Lanconelli }
14651197abfSClaudio Lanconelli
14751197abfSClaudio Lanconelli /* Read physical sector (wrapper to MTD_READ) */
read_physical_sector(struct mtd_info * mtd,uint8_t * sect_buf,int sect_no)14851197abfSClaudio Lanconelli static int read_physical_sector(struct mtd_info *mtd, uint8_t *sect_buf,
14951197abfSClaudio Lanconelli int sect_no)
15051197abfSClaudio Lanconelli {
15151197abfSClaudio Lanconelli int ret;
15251197abfSClaudio Lanconelli size_t retlen;
15351197abfSClaudio Lanconelli loff_t offset = (loff_t)sect_no << SECTOR_SHIFT;
15451197abfSClaudio Lanconelli
155329ad399SArtem Bityutskiy ret = mtd_read(mtd, offset, SECTOR_SIZE, &retlen, sect_buf);
15651197abfSClaudio Lanconelli if (ret < 0 || retlen != SECTOR_SIZE)
15751197abfSClaudio Lanconelli return -1;
15851197abfSClaudio Lanconelli
15951197abfSClaudio Lanconelli return 0;
16051197abfSClaudio Lanconelli }
16151197abfSClaudio Lanconelli
16251197abfSClaudio Lanconelli /* Read redundancy area (wrapper to MTD_READ_OOB */
read_raw_oob(struct mtd_info * mtd,loff_t offs,uint8_t * buf)16351197abfSClaudio Lanconelli static int read_raw_oob(struct mtd_info *mtd, loff_t offs, uint8_t *buf)
16451197abfSClaudio Lanconelli {
165745df179SMichał Kępień struct mtd_oob_ops ops = { };
16651197abfSClaudio Lanconelli int ret;
16751197abfSClaudio Lanconelli
1680612b9ddSBrian Norris ops.mode = MTD_OPS_RAW;
16951197abfSClaudio Lanconelli ops.ooboffs = 0;
1707014568bSVitaly Wool ops.ooblen = OOB_SIZE;
17151197abfSClaudio Lanconelli ops.oobbuf = buf;
17251197abfSClaudio Lanconelli ops.datbuf = NULL;
17351197abfSClaudio Lanconelli
174fd2819bbSArtem Bityutskiy ret = mtd_read_oob(mtd, offs, &ops);
1757014568bSVitaly Wool if (ret < 0 || ops.oobretlen != OOB_SIZE)
17651197abfSClaudio Lanconelli return -1;
17751197abfSClaudio Lanconelli
17851197abfSClaudio Lanconelli return 0;
17951197abfSClaudio Lanconelli }
18051197abfSClaudio Lanconelli
18151197abfSClaudio Lanconelli /* Parity calculator on a word of n bit size */
get_parity(int number,int size)18251197abfSClaudio Lanconelli static int get_parity(int number, int size)
18351197abfSClaudio Lanconelli {
18451197abfSClaudio Lanconelli int k;
18551197abfSClaudio Lanconelli int parity;
18651197abfSClaudio Lanconelli
18751197abfSClaudio Lanconelli parity = 1;
18851197abfSClaudio Lanconelli for (k = 0; k < size; k++) {
18951197abfSClaudio Lanconelli parity += (number >> k);
19051197abfSClaudio Lanconelli parity &= 1;
19151197abfSClaudio Lanconelli }
19251197abfSClaudio Lanconelli return parity;
19351197abfSClaudio Lanconelli }
19451197abfSClaudio Lanconelli
19551197abfSClaudio Lanconelli /* Read and validate the logical block address field stored in the OOB */
get_logical_address(uint8_t * oob_buf)19651197abfSClaudio Lanconelli static int get_logical_address(uint8_t *oob_buf)
19751197abfSClaudio Lanconelli {
19851197abfSClaudio Lanconelli int block_address, parity;
19951197abfSClaudio Lanconelli int offset[2] = {6, 11}; /* offset of the 2 address fields within OOB */
20051197abfSClaudio Lanconelli int j;
20151197abfSClaudio Lanconelli int ok = 0;
20251197abfSClaudio Lanconelli
20351197abfSClaudio Lanconelli /*
20451197abfSClaudio Lanconelli * Look for the first valid logical address
20551197abfSClaudio Lanconelli * Valid address has fixed pattern on most significant bits and
20651197abfSClaudio Lanconelli * parity check
20751197abfSClaudio Lanconelli */
20851197abfSClaudio Lanconelli for (j = 0; j < ARRAY_SIZE(offset); j++) {
20951197abfSClaudio Lanconelli block_address = ((int)oob_buf[offset[j]] << 8) |
21051197abfSClaudio Lanconelli oob_buf[offset[j]+1];
21151197abfSClaudio Lanconelli
21251197abfSClaudio Lanconelli /* Check for the signature bits in the address field (MSBits) */
21351197abfSClaudio Lanconelli if ((block_address & ~0x7FF) == 0x1000) {
21451197abfSClaudio Lanconelli parity = block_address & 0x01;
21551197abfSClaudio Lanconelli block_address &= 0x7FF;
21651197abfSClaudio Lanconelli block_address >>= 1;
21751197abfSClaudio Lanconelli
21851197abfSClaudio Lanconelli if (get_parity(block_address, 10) != parity) {
219289c0522SBrian Norris pr_debug("SSFDC_RO: logical address field%d"
22051197abfSClaudio Lanconelli "parity error(0x%04X)\n", j+1,
22151197abfSClaudio Lanconelli block_address);
22251197abfSClaudio Lanconelli } else {
22351197abfSClaudio Lanconelli ok = 1;
22451197abfSClaudio Lanconelli break;
22551197abfSClaudio Lanconelli }
22651197abfSClaudio Lanconelli }
22751197abfSClaudio Lanconelli }
22851197abfSClaudio Lanconelli
22951197abfSClaudio Lanconelli if (!ok)
23051197abfSClaudio Lanconelli block_address = -2;
23151197abfSClaudio Lanconelli
232289c0522SBrian Norris pr_debug("SSFDC_RO: get_logical_address() %d\n",
23351197abfSClaudio Lanconelli block_address);
23451197abfSClaudio Lanconelli
23551197abfSClaudio Lanconelli return block_address;
23651197abfSClaudio Lanconelli }
23751197abfSClaudio Lanconelli
23851197abfSClaudio Lanconelli /* Build the logic block map */
build_logical_block_map(struct ssfdcr_record * ssfdc)23951197abfSClaudio Lanconelli static int build_logical_block_map(struct ssfdcr_record *ssfdc)
24051197abfSClaudio Lanconelli {
24151197abfSClaudio Lanconelli unsigned long offset;
24251197abfSClaudio Lanconelli uint8_t oob_buf[OOB_SIZE];
24351197abfSClaudio Lanconelli int ret, block_address, phys_block;
24451197abfSClaudio Lanconelli struct mtd_info *mtd = ssfdc->mbd.mtd;
24551197abfSClaudio Lanconelli
246289c0522SBrian Norris pr_debug("SSFDC_RO: build_block_map() nblks=%d (%luK)\n",
24708d3ad6aSDavid Woodhouse ssfdc->map_len,
24808d3ad6aSDavid Woodhouse (unsigned long)ssfdc->map_len * ssfdc->erase_size / 1024);
24951197abfSClaudio Lanconelli
25051197abfSClaudio Lanconelli /* Scan every physical block, skip CIS block */
25151197abfSClaudio Lanconelli for (phys_block = ssfdc->cis_block + 1; phys_block < ssfdc->map_len;
25251197abfSClaudio Lanconelli phys_block++) {
25351197abfSClaudio Lanconelli offset = (unsigned long)phys_block * ssfdc->erase_size;
2547086c19dSArtem Bityutskiy if (mtd_block_isbad(mtd, offset))
25551197abfSClaudio Lanconelli continue; /* skip bad blocks */
25651197abfSClaudio Lanconelli
25751197abfSClaudio Lanconelli ret = read_raw_oob(mtd, offset, oob_buf);
25851197abfSClaudio Lanconelli if (ret < 0) {
259289c0522SBrian Norris pr_debug("SSFDC_RO: mtd read_oob() failed at %lu\n",
26051197abfSClaudio Lanconelli offset);
26151197abfSClaudio Lanconelli return -1;
26251197abfSClaudio Lanconelli }
26351197abfSClaudio Lanconelli block_address = get_logical_address(oob_buf);
26451197abfSClaudio Lanconelli
26551197abfSClaudio Lanconelli /* Skip invalid addresses */
26651197abfSClaudio Lanconelli if (block_address >= 0 &&
26751197abfSClaudio Lanconelli block_address < MAX_LOGIC_BLK_PER_ZONE) {
26851197abfSClaudio Lanconelli int zone_index;
26951197abfSClaudio Lanconelli
27051197abfSClaudio Lanconelli zone_index = phys_block / MAX_PHYS_BLK_PER_ZONE;
27151197abfSClaudio Lanconelli block_address += zone_index * MAX_LOGIC_BLK_PER_ZONE;
27251197abfSClaudio Lanconelli ssfdc->logic_block_map[block_address] =
27351197abfSClaudio Lanconelli (unsigned short)phys_block;
27451197abfSClaudio Lanconelli
275289c0522SBrian Norris pr_debug("SSFDC_RO: build_block_map() phys_block=%d,"
27651197abfSClaudio Lanconelli "logic_block_addr=%d, zone=%d\n",
27751197abfSClaudio Lanconelli phys_block, block_address, zone_index);
27851197abfSClaudio Lanconelli }
27951197abfSClaudio Lanconelli }
28051197abfSClaudio Lanconelli return 0;
28151197abfSClaudio Lanconelli }
28251197abfSClaudio Lanconelli
ssfdcr_add_mtd(struct mtd_blktrans_ops * tr,struct mtd_info * mtd)28351197abfSClaudio Lanconelli static void ssfdcr_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
28451197abfSClaudio Lanconelli {
28551197abfSClaudio Lanconelli struct ssfdcr_record *ssfdc;
28651197abfSClaudio Lanconelli int cis_sector;
28751197abfSClaudio Lanconelli
28851197abfSClaudio Lanconelli /* Check for small page NAND flash */
289818b9739SHuang Shijie if (!mtd_type_is_nand(mtd) || mtd->oobsize != OOB_SIZE ||
29069423d99SAdrian Hunter mtd->size > UINT_MAX)
29151197abfSClaudio Lanconelli return;
29251197abfSClaudio Lanconelli
29351197abfSClaudio Lanconelli /* Check for SSDFC format by reading CIS/IDI sector */
29451197abfSClaudio Lanconelli cis_sector = get_valid_cis_sector(mtd);
29551197abfSClaudio Lanconelli if (cis_sector == -1)
29651197abfSClaudio Lanconelli return;
29751197abfSClaudio Lanconelli
298*0d9a4164SMarkus Elfring ssfdc = kzalloc(sizeof(*ssfdc), GFP_KERNEL);
2990870066dSBrian Norris if (!ssfdc)
30051197abfSClaudio Lanconelli return;
30151197abfSClaudio Lanconelli
30251197abfSClaudio Lanconelli ssfdc->mbd.mtd = mtd;
30351197abfSClaudio Lanconelli ssfdc->mbd.devnum = -1;
30451197abfSClaudio Lanconelli ssfdc->mbd.tr = tr;
30551197abfSClaudio Lanconelli ssfdc->mbd.readonly = 1;
30651197abfSClaudio Lanconelli
30751197abfSClaudio Lanconelli ssfdc->cis_block = cis_sector / (mtd->erasesize >> SECTOR_SHIFT);
30851197abfSClaudio Lanconelli ssfdc->erase_size = mtd->erasesize;
30969423d99SAdrian Hunter ssfdc->map_len = (u32)mtd->size / mtd->erasesize;
31051197abfSClaudio Lanconelli
311289c0522SBrian Norris pr_debug("SSFDC_RO: cis_block=%d,erase_size=%d,map_len=%d,n_zones=%d\n",
31251197abfSClaudio Lanconelli ssfdc->cis_block, ssfdc->erase_size, ssfdc->map_len,
313c8872b06SJulia Lawall DIV_ROUND_UP(ssfdc->map_len, MAX_PHYS_BLK_PER_ZONE));
31451197abfSClaudio Lanconelli
31551197abfSClaudio Lanconelli /* Set geometry */
31651197abfSClaudio Lanconelli ssfdc->heads = 16;
31751197abfSClaudio Lanconelli ssfdc->sectors = 32;
31851197abfSClaudio Lanconelli get_chs(mtd->size, NULL, &ssfdc->heads, &ssfdc->sectors);
31969423d99SAdrian Hunter ssfdc->cylinders = (unsigned short)(((u32)mtd->size >> SECTOR_SHIFT) /
32051197abfSClaudio Lanconelli ((long)ssfdc->sectors * (long)ssfdc->heads));
32151197abfSClaudio Lanconelli
322289c0522SBrian Norris pr_debug("SSFDC_RO: using C:%d H:%d S:%d == %ld sects\n",
32351197abfSClaudio Lanconelli ssfdc->cylinders, ssfdc->heads , ssfdc->sectors,
32451197abfSClaudio Lanconelli (long)ssfdc->cylinders * (long)ssfdc->heads *
32551197abfSClaudio Lanconelli (long)ssfdc->sectors);
32651197abfSClaudio Lanconelli
32751197abfSClaudio Lanconelli ssfdc->mbd.size = (long)ssfdc->heads * (long)ssfdc->cylinders *
32851197abfSClaudio Lanconelli (long)ssfdc->sectors;
32951197abfSClaudio Lanconelli
33051197abfSClaudio Lanconelli /* Allocate logical block map */
3316da2ec56SKees Cook ssfdc->logic_block_map =
3326da2ec56SKees Cook kmalloc_array(ssfdc->map_len,
3336da2ec56SKees Cook sizeof(ssfdc->logic_block_map[0]), GFP_KERNEL);
3340870066dSBrian Norris if (!ssfdc->logic_block_map)
335e8b7d11cSMarkus Elfring goto out_free_ssfdc;
33651197abfSClaudio Lanconelli memset(ssfdc->logic_block_map, 0xff, sizeof(ssfdc->logic_block_map[0]) *
33751197abfSClaudio Lanconelli ssfdc->map_len);
33851197abfSClaudio Lanconelli
33951197abfSClaudio Lanconelli /* Build logical block map */
34051197abfSClaudio Lanconelli if (build_logical_block_map(ssfdc) < 0)
34151197abfSClaudio Lanconelli goto out_err;
34251197abfSClaudio Lanconelli
34351197abfSClaudio Lanconelli /* Register device + partitions */
34451197abfSClaudio Lanconelli if (add_mtd_blktrans_dev(&ssfdc->mbd))
34551197abfSClaudio Lanconelli goto out_err;
34651197abfSClaudio Lanconelli
34751197abfSClaudio Lanconelli printk(KERN_INFO "SSFDC_RO: Found ssfdc%c on mtd%d (%s)\n",
34851197abfSClaudio Lanconelli ssfdc->mbd.devnum + 'a', mtd->index, mtd->name);
34951197abfSClaudio Lanconelli return;
35051197abfSClaudio Lanconelli
35151197abfSClaudio Lanconelli out_err:
35251197abfSClaudio Lanconelli kfree(ssfdc->logic_block_map);
353e8b7d11cSMarkus Elfring out_free_ssfdc:
35451197abfSClaudio Lanconelli kfree(ssfdc);
35551197abfSClaudio Lanconelli }
35651197abfSClaudio Lanconelli
ssfdcr_remove_dev(struct mtd_blktrans_dev * dev)35751197abfSClaudio Lanconelli static void ssfdcr_remove_dev(struct mtd_blktrans_dev *dev)
35851197abfSClaudio Lanconelli {
35951197abfSClaudio Lanconelli struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev;
36051197abfSClaudio Lanconelli
361289c0522SBrian Norris pr_debug("SSFDC_RO: remove_dev (i=%d)\n", dev->devnum);
36251197abfSClaudio Lanconelli
36351197abfSClaudio Lanconelli del_mtd_blktrans_dev(dev);
36451197abfSClaudio Lanconelli kfree(ssfdc->logic_block_map);
36551197abfSClaudio Lanconelli }
36651197abfSClaudio Lanconelli
ssfdcr_readsect(struct mtd_blktrans_dev * dev,unsigned long logic_sect_no,char * buf)36751197abfSClaudio Lanconelli static int ssfdcr_readsect(struct mtd_blktrans_dev *dev,
36851197abfSClaudio Lanconelli unsigned long logic_sect_no, char *buf)
36951197abfSClaudio Lanconelli {
37051197abfSClaudio Lanconelli struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev;
37151197abfSClaudio Lanconelli int sectors_per_block, offset, block_address;
37251197abfSClaudio Lanconelli
37351197abfSClaudio Lanconelli sectors_per_block = ssfdc->erase_size >> SECTOR_SHIFT;
37451197abfSClaudio Lanconelli offset = (int)(logic_sect_no % sectors_per_block);
37551197abfSClaudio Lanconelli block_address = (int)(logic_sect_no / sectors_per_block);
37651197abfSClaudio Lanconelli
377289c0522SBrian Norris pr_debug("SSFDC_RO: ssfdcr_readsect(%lu) sec_per_blk=%d, ofst=%d,"
37851197abfSClaudio Lanconelli " block_addr=%d\n", logic_sect_no, sectors_per_block, offset,
37951197abfSClaudio Lanconelli block_address);
38051197abfSClaudio Lanconelli
3818bf66b24SAmitoj Kaur Chawla BUG_ON(block_address >= ssfdc->map_len);
38251197abfSClaudio Lanconelli
38351197abfSClaudio Lanconelli block_address = ssfdc->logic_block_map[block_address];
38451197abfSClaudio Lanconelli
385289c0522SBrian Norris pr_debug("SSFDC_RO: ssfdcr_readsect() phys_block_addr=%d\n",
38651197abfSClaudio Lanconelli block_address);
38751197abfSClaudio Lanconelli
38851197abfSClaudio Lanconelli if (block_address < 0xffff) {
38951197abfSClaudio Lanconelli unsigned long sect_no;
39051197abfSClaudio Lanconelli
39151197abfSClaudio Lanconelli sect_no = (unsigned long)block_address * sectors_per_block +
39251197abfSClaudio Lanconelli offset;
39351197abfSClaudio Lanconelli
394289c0522SBrian Norris pr_debug("SSFDC_RO: ssfdcr_readsect() phys_sect_no=%lu\n",
39551197abfSClaudio Lanconelli sect_no);
39651197abfSClaudio Lanconelli
39751197abfSClaudio Lanconelli if (read_physical_sector(ssfdc->mbd.mtd, buf, sect_no) < 0)
39851197abfSClaudio Lanconelli return -EIO;
39951197abfSClaudio Lanconelli } else {
40051197abfSClaudio Lanconelli memset(buf, 0xff, SECTOR_SIZE);
40151197abfSClaudio Lanconelli }
40251197abfSClaudio Lanconelli
40351197abfSClaudio Lanconelli return 0;
40451197abfSClaudio Lanconelli }
40551197abfSClaudio Lanconelli
ssfdcr_getgeo(struct mtd_blktrans_dev * dev,struct hd_geometry * geo)40651197abfSClaudio Lanconelli static int ssfdcr_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
40751197abfSClaudio Lanconelli {
40851197abfSClaudio Lanconelli struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev;
40951197abfSClaudio Lanconelli
410289c0522SBrian Norris pr_debug("SSFDC_RO: ssfdcr_getgeo() C=%d, H=%d, S=%d\n",
41151197abfSClaudio Lanconelli ssfdc->cylinders, ssfdc->heads, ssfdc->sectors);
41251197abfSClaudio Lanconelli
41351197abfSClaudio Lanconelli geo->heads = ssfdc->heads;
41451197abfSClaudio Lanconelli geo->sectors = ssfdc->sectors;
41551197abfSClaudio Lanconelli geo->cylinders = ssfdc->cylinders;
41651197abfSClaudio Lanconelli
41751197abfSClaudio Lanconelli return 0;
41851197abfSClaudio Lanconelli }
41951197abfSClaudio Lanconelli
42051197abfSClaudio Lanconelli /****************************************************************************
42151197abfSClaudio Lanconelli *
42251197abfSClaudio Lanconelli * Module stuff
42351197abfSClaudio Lanconelli *
42451197abfSClaudio Lanconelli ****************************************************************************/
42551197abfSClaudio Lanconelli
42651197abfSClaudio Lanconelli static struct mtd_blktrans_ops ssfdcr_tr = {
42751197abfSClaudio Lanconelli .name = "ssfdc",
42851197abfSClaudio Lanconelli .major = SSFDCR_MAJOR,
42951197abfSClaudio Lanconelli .part_bits = SSFDCR_PARTN_BITS,
43076ab40e4SDavid Woodhouse .blksize = SECTOR_SIZE,
43151197abfSClaudio Lanconelli .getgeo = ssfdcr_getgeo,
43251197abfSClaudio Lanconelli .readsect = ssfdcr_readsect,
43351197abfSClaudio Lanconelli .add_mtd = ssfdcr_add_mtd,
43451197abfSClaudio Lanconelli .remove_dev = ssfdcr_remove_dev,
43551197abfSClaudio Lanconelli .owner = THIS_MODULE,
43651197abfSClaudio Lanconelli };
43751197abfSClaudio Lanconelli
init_ssfdcr(void)43851197abfSClaudio Lanconelli static int __init init_ssfdcr(void)
43951197abfSClaudio Lanconelli {
44051197abfSClaudio Lanconelli printk(KERN_INFO "SSFDC read-only Flash Translation layer\n");
44151197abfSClaudio Lanconelli
44251197abfSClaudio Lanconelli return register_mtd_blktrans(&ssfdcr_tr);
44351197abfSClaudio Lanconelli }
44451197abfSClaudio Lanconelli
cleanup_ssfdcr(void)44551197abfSClaudio Lanconelli static void __exit cleanup_ssfdcr(void)
44651197abfSClaudio Lanconelli {
44751197abfSClaudio Lanconelli deregister_mtd_blktrans(&ssfdcr_tr);
44851197abfSClaudio Lanconelli }
44951197abfSClaudio Lanconelli
45051197abfSClaudio Lanconelli module_init(init_ssfdcr);
45151197abfSClaudio Lanconelli module_exit(cleanup_ssfdcr);
45251197abfSClaudio Lanconelli
45351197abfSClaudio Lanconelli MODULE_LICENSE("GPL");
45451197abfSClaudio Lanconelli MODULE_AUTHOR("Claudio Lanconelli <lanconelli.claudio@eptar.com>");
45551197abfSClaudio Lanconelli MODULE_DESCRIPTION("Flash Translation Layer for read-only SSFDC SmartMedia card");
456