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 int usecount; 2251197abfSClaudio Lanconelli unsigned char heads; 2351197abfSClaudio Lanconelli unsigned char sectors; 2451197abfSClaudio Lanconelli unsigned short cylinders; 2551197abfSClaudio Lanconelli int cis_block; /* block n. containing CIS/IDI */ 2651197abfSClaudio Lanconelli int erase_size; /* phys_block_size */ 2751197abfSClaudio Lanconelli unsigned short *logic_block_map; /* all zones (max 8192 phys blocks on 289a05ededSDavid Woodhouse the 128MiB) */ 2951197abfSClaudio Lanconelli int map_len; /* n. phys_blocks on the card */ 3051197abfSClaudio Lanconelli }; 3151197abfSClaudio Lanconelli 3251197abfSClaudio Lanconelli #define SSFDCR_MAJOR 257 3351197abfSClaudio Lanconelli #define SSFDCR_PARTN_BITS 3 3451197abfSClaudio Lanconelli 3551197abfSClaudio Lanconelli #define SECTOR_SIZE 512 3651197abfSClaudio Lanconelli #define SECTOR_SHIFT 9 3751197abfSClaudio Lanconelli #define OOB_SIZE 16 3851197abfSClaudio Lanconelli 3951197abfSClaudio Lanconelli #define MAX_LOGIC_BLK_PER_ZONE 1000 4051197abfSClaudio Lanconelli #define MAX_PHYS_BLK_PER_ZONE 1024 4151197abfSClaudio Lanconelli 429a05ededSDavid Woodhouse #define KiB(x) ( (x) * 1024L ) 439a05ededSDavid Woodhouse #define MiB(x) ( KiB(x) * 1024L ) 4451197abfSClaudio Lanconelli 4551197abfSClaudio Lanconelli /** CHS Table 469a05ededSDavid Woodhouse 1MiB 2MiB 4MiB 8MiB 16MiB 32MiB 64MiB 128MiB 4751197abfSClaudio Lanconelli NCylinder 125 125 250 250 500 500 500 500 4851197abfSClaudio Lanconelli NHead 4 4 4 4 4 8 8 16 4951197abfSClaudio Lanconelli NSector 4 8 8 16 16 16 32 32 5051197abfSClaudio Lanconelli SumSector 2,000 4,000 8,000 16,000 32,000 64,000 128,000 256,000 5151197abfSClaudio Lanconelli SectorSize 512 512 512 512 512 512 512 512 5251197abfSClaudio Lanconelli **/ 5351197abfSClaudio Lanconelli 5451197abfSClaudio Lanconelli typedef struct { 5551197abfSClaudio Lanconelli unsigned long size; 5651197abfSClaudio Lanconelli unsigned short cyl; 5751197abfSClaudio Lanconelli unsigned char head; 5851197abfSClaudio Lanconelli unsigned char sec; 5951197abfSClaudio Lanconelli } chs_entry_t; 6051197abfSClaudio Lanconelli 6151197abfSClaudio Lanconelli /* Must be ordered by size */ 6251197abfSClaudio Lanconelli static const chs_entry_t chs_table[] = { 639a05ededSDavid Woodhouse { MiB( 1), 125, 4, 4 }, 649a05ededSDavid Woodhouse { MiB( 2), 125, 4, 8 }, 659a05ededSDavid Woodhouse { MiB( 4), 250, 4, 8 }, 669a05ededSDavid Woodhouse { MiB( 8), 250, 4, 16 }, 679a05ededSDavid Woodhouse { MiB( 16), 500, 4, 16 }, 689a05ededSDavid Woodhouse { MiB( 32), 500, 8, 16 }, 699a05ededSDavid Woodhouse { MiB( 64), 500, 8, 32 }, 709a05ededSDavid Woodhouse { MiB(128), 500, 16, 32 }, 7151197abfSClaudio Lanconelli { 0 }, 7251197abfSClaudio Lanconelli }; 7351197abfSClaudio Lanconelli 7451197abfSClaudio Lanconelli static int get_chs(unsigned long size, unsigned short *cyl, unsigned char *head, 7551197abfSClaudio Lanconelli unsigned char *sec) 7651197abfSClaudio Lanconelli { 7751197abfSClaudio Lanconelli int k; 7851197abfSClaudio Lanconelli int found = 0; 7951197abfSClaudio Lanconelli 8051197abfSClaudio Lanconelli k = 0; 8151197abfSClaudio Lanconelli while (chs_table[k].size > 0 && size > chs_table[k].size) 8251197abfSClaudio Lanconelli k++; 8351197abfSClaudio Lanconelli 8451197abfSClaudio Lanconelli if (chs_table[k].size > 0) { 8551197abfSClaudio Lanconelli if (cyl) 8651197abfSClaudio Lanconelli *cyl = chs_table[k].cyl; 8751197abfSClaudio Lanconelli if (head) 8851197abfSClaudio Lanconelli *head = chs_table[k].head; 8951197abfSClaudio Lanconelli if (sec) 9051197abfSClaudio Lanconelli *sec = chs_table[k].sec; 9151197abfSClaudio Lanconelli found = 1; 9251197abfSClaudio Lanconelli } 9351197abfSClaudio Lanconelli 9451197abfSClaudio Lanconelli return found; 9551197abfSClaudio Lanconelli } 9651197abfSClaudio Lanconelli 9751197abfSClaudio Lanconelli /* These bytes are the signature for the CIS/IDI sector */ 9851197abfSClaudio Lanconelli static const uint8_t cis_numbers[] = { 9951197abfSClaudio Lanconelli 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20 10051197abfSClaudio Lanconelli }; 10151197abfSClaudio Lanconelli 10251197abfSClaudio Lanconelli /* Read and check for a valid CIS sector */ 10351197abfSClaudio Lanconelli static int get_valid_cis_sector(struct mtd_info *mtd) 10451197abfSClaudio Lanconelli { 10551197abfSClaudio Lanconelli int ret, k, cis_sector; 10651197abfSClaudio Lanconelli size_t retlen; 10751197abfSClaudio Lanconelli loff_t offset; 1089a05ededSDavid Woodhouse uint8_t *sect_buf; 1099a05ededSDavid Woodhouse 1109a05ededSDavid Woodhouse cis_sector = -1; 1119a05ededSDavid Woodhouse 1129a05ededSDavid Woodhouse sect_buf = kmalloc(SECTOR_SIZE, GFP_KERNEL); 1139a05ededSDavid Woodhouse if (!sect_buf) 1149a05ededSDavid Woodhouse goto out; 11551197abfSClaudio Lanconelli 11651197abfSClaudio Lanconelli /* 11751197abfSClaudio Lanconelli * Look for CIS/IDI sector on the first GOOD block (give up after 4 bad 11851197abfSClaudio Lanconelli * blocks). If the first good block doesn't contain CIS number the flash 11951197abfSClaudio Lanconelli * is not SSFDC formatted 12051197abfSClaudio Lanconelli */ 12151197abfSClaudio Lanconelli for (k = 0, offset = 0; k < 4; k++, offset += mtd->erasesize) { 1227086c19dSArtem Bityutskiy if (mtd_block_isbad(mtd, offset)) { 123329ad399SArtem Bityutskiy ret = mtd_read(mtd, offset, SECTOR_SIZE, &retlen, 12451197abfSClaudio Lanconelli sect_buf); 12551197abfSClaudio Lanconelli 12651197abfSClaudio Lanconelli /* CIS pattern match on the sector buffer */ 12751197abfSClaudio Lanconelli if (ret < 0 || retlen != SECTOR_SIZE) { 12851197abfSClaudio Lanconelli printk(KERN_WARNING 12951197abfSClaudio Lanconelli "SSFDC_RO:can't read CIS/IDI sector\n"); 13051197abfSClaudio Lanconelli } else if (!memcmp(sect_buf, cis_numbers, 13151197abfSClaudio Lanconelli sizeof(cis_numbers))) { 13251197abfSClaudio Lanconelli /* Found */ 13351197abfSClaudio Lanconelli cis_sector = (int)(offset >> SECTOR_SHIFT); 13451197abfSClaudio Lanconelli } else { 135289c0522SBrian Norris pr_debug("SSFDC_RO: CIS/IDI sector not found" 13651197abfSClaudio Lanconelli " on %s (mtd%d)\n", mtd->name, 13751197abfSClaudio Lanconelli mtd->index); 13851197abfSClaudio Lanconelli } 13951197abfSClaudio Lanconelli break; 14051197abfSClaudio Lanconelli } 14151197abfSClaudio Lanconelli } 14251197abfSClaudio Lanconelli 1439a05ededSDavid Woodhouse kfree(sect_buf); 1449a05ededSDavid Woodhouse out: 14551197abfSClaudio Lanconelli return cis_sector; 14651197abfSClaudio Lanconelli } 14751197abfSClaudio Lanconelli 14851197abfSClaudio Lanconelli /* Read physical sector (wrapper to MTD_READ) */ 14951197abfSClaudio Lanconelli static int read_physical_sector(struct mtd_info *mtd, uint8_t *sect_buf, 15051197abfSClaudio Lanconelli int sect_no) 15151197abfSClaudio Lanconelli { 15251197abfSClaudio Lanconelli int ret; 15351197abfSClaudio Lanconelli size_t retlen; 15451197abfSClaudio Lanconelli loff_t offset = (loff_t)sect_no << SECTOR_SHIFT; 15551197abfSClaudio Lanconelli 156329ad399SArtem Bityutskiy ret = mtd_read(mtd, offset, SECTOR_SIZE, &retlen, sect_buf); 15751197abfSClaudio Lanconelli if (ret < 0 || retlen != SECTOR_SIZE) 15851197abfSClaudio Lanconelli return -1; 15951197abfSClaudio Lanconelli 16051197abfSClaudio Lanconelli return 0; 16151197abfSClaudio Lanconelli } 16251197abfSClaudio Lanconelli 16351197abfSClaudio Lanconelli /* Read redundancy area (wrapper to MTD_READ_OOB */ 16451197abfSClaudio Lanconelli static int read_raw_oob(struct mtd_info *mtd, loff_t offs, uint8_t *buf) 16551197abfSClaudio Lanconelli { 16651197abfSClaudio Lanconelli struct mtd_oob_ops ops; 16751197abfSClaudio Lanconelli int ret; 16851197abfSClaudio Lanconelli 1690612b9ddSBrian Norris ops.mode = MTD_OPS_RAW; 17051197abfSClaudio Lanconelli ops.ooboffs = 0; 1717014568bSVitaly Wool ops.ooblen = OOB_SIZE; 17251197abfSClaudio Lanconelli ops.oobbuf = buf; 17351197abfSClaudio Lanconelli ops.datbuf = NULL; 17451197abfSClaudio Lanconelli 175fd2819bbSArtem Bityutskiy ret = mtd_read_oob(mtd, offs, &ops); 1767014568bSVitaly Wool if (ret < 0 || ops.oobretlen != OOB_SIZE) 17751197abfSClaudio Lanconelli return -1; 17851197abfSClaudio Lanconelli 17951197abfSClaudio Lanconelli return 0; 18051197abfSClaudio Lanconelli } 18151197abfSClaudio Lanconelli 18251197abfSClaudio Lanconelli /* Parity calculator on a word of n bit size */ 18351197abfSClaudio Lanconelli static int get_parity(int number, int size) 18451197abfSClaudio Lanconelli { 18551197abfSClaudio Lanconelli int k; 18651197abfSClaudio Lanconelli int parity; 18751197abfSClaudio Lanconelli 18851197abfSClaudio Lanconelli parity = 1; 18951197abfSClaudio Lanconelli for (k = 0; k < size; k++) { 19051197abfSClaudio Lanconelli parity += (number >> k); 19151197abfSClaudio Lanconelli parity &= 1; 19251197abfSClaudio Lanconelli } 19351197abfSClaudio Lanconelli return parity; 19451197abfSClaudio Lanconelli } 19551197abfSClaudio Lanconelli 19651197abfSClaudio Lanconelli /* Read and validate the logical block address field stored in the OOB */ 19751197abfSClaudio Lanconelli static int get_logical_address(uint8_t *oob_buf) 19851197abfSClaudio Lanconelli { 19951197abfSClaudio Lanconelli int block_address, parity; 20051197abfSClaudio Lanconelli int offset[2] = {6, 11}; /* offset of the 2 address fields within OOB */ 20151197abfSClaudio Lanconelli int j; 20251197abfSClaudio Lanconelli int ok = 0; 20351197abfSClaudio Lanconelli 20451197abfSClaudio Lanconelli /* 20551197abfSClaudio Lanconelli * Look for the first valid logical address 20651197abfSClaudio Lanconelli * Valid address has fixed pattern on most significant bits and 20751197abfSClaudio Lanconelli * parity check 20851197abfSClaudio Lanconelli */ 20951197abfSClaudio Lanconelli for (j = 0; j < ARRAY_SIZE(offset); j++) { 21051197abfSClaudio Lanconelli block_address = ((int)oob_buf[offset[j]] << 8) | 21151197abfSClaudio Lanconelli oob_buf[offset[j]+1]; 21251197abfSClaudio Lanconelli 21351197abfSClaudio Lanconelli /* Check for the signature bits in the address field (MSBits) */ 21451197abfSClaudio Lanconelli if ((block_address & ~0x7FF) == 0x1000) { 21551197abfSClaudio Lanconelli parity = block_address & 0x01; 21651197abfSClaudio Lanconelli block_address &= 0x7FF; 21751197abfSClaudio Lanconelli block_address >>= 1; 21851197abfSClaudio Lanconelli 21951197abfSClaudio Lanconelli if (get_parity(block_address, 10) != parity) { 220289c0522SBrian Norris pr_debug("SSFDC_RO: logical address field%d" 22151197abfSClaudio Lanconelli "parity error(0x%04X)\n", j+1, 22251197abfSClaudio Lanconelli block_address); 22351197abfSClaudio Lanconelli } else { 22451197abfSClaudio Lanconelli ok = 1; 22551197abfSClaudio Lanconelli break; 22651197abfSClaudio Lanconelli } 22751197abfSClaudio Lanconelli } 22851197abfSClaudio Lanconelli } 22951197abfSClaudio Lanconelli 23051197abfSClaudio Lanconelli if (!ok) 23151197abfSClaudio Lanconelli block_address = -2; 23251197abfSClaudio Lanconelli 233289c0522SBrian Norris pr_debug("SSFDC_RO: get_logical_address() %d\n", 23451197abfSClaudio Lanconelli block_address); 23551197abfSClaudio Lanconelli 23651197abfSClaudio Lanconelli return block_address; 23751197abfSClaudio Lanconelli } 23851197abfSClaudio Lanconelli 23951197abfSClaudio Lanconelli /* Build the logic block map */ 24051197abfSClaudio Lanconelli static int build_logical_block_map(struct ssfdcr_record *ssfdc) 24151197abfSClaudio Lanconelli { 24251197abfSClaudio Lanconelli unsigned long offset; 24351197abfSClaudio Lanconelli uint8_t oob_buf[OOB_SIZE]; 24451197abfSClaudio Lanconelli int ret, block_address, phys_block; 24551197abfSClaudio Lanconelli struct mtd_info *mtd = ssfdc->mbd.mtd; 24651197abfSClaudio Lanconelli 247289c0522SBrian Norris pr_debug("SSFDC_RO: build_block_map() nblks=%d (%luK)\n", 24808d3ad6aSDavid Woodhouse ssfdc->map_len, 24908d3ad6aSDavid Woodhouse (unsigned long)ssfdc->map_len * ssfdc->erase_size / 1024); 25051197abfSClaudio Lanconelli 25151197abfSClaudio Lanconelli /* Scan every physical block, skip CIS block */ 25251197abfSClaudio Lanconelli for (phys_block = ssfdc->cis_block + 1; phys_block < ssfdc->map_len; 25351197abfSClaudio Lanconelli phys_block++) { 25451197abfSClaudio Lanconelli offset = (unsigned long)phys_block * ssfdc->erase_size; 2557086c19dSArtem Bityutskiy if (mtd_block_isbad(mtd, offset)) 25651197abfSClaudio Lanconelli continue; /* skip bad blocks */ 25751197abfSClaudio Lanconelli 25851197abfSClaudio Lanconelli ret = read_raw_oob(mtd, offset, oob_buf); 25951197abfSClaudio Lanconelli if (ret < 0) { 260289c0522SBrian Norris pr_debug("SSFDC_RO: mtd read_oob() failed at %lu\n", 26151197abfSClaudio Lanconelli offset); 26251197abfSClaudio Lanconelli return -1; 26351197abfSClaudio Lanconelli } 26451197abfSClaudio Lanconelli block_address = get_logical_address(oob_buf); 26551197abfSClaudio Lanconelli 26651197abfSClaudio Lanconelli /* Skip invalid addresses */ 26751197abfSClaudio Lanconelli if (block_address >= 0 && 26851197abfSClaudio Lanconelli block_address < MAX_LOGIC_BLK_PER_ZONE) { 26951197abfSClaudio Lanconelli int zone_index; 27051197abfSClaudio Lanconelli 27151197abfSClaudio Lanconelli zone_index = phys_block / MAX_PHYS_BLK_PER_ZONE; 27251197abfSClaudio Lanconelli block_address += zone_index * MAX_LOGIC_BLK_PER_ZONE; 27351197abfSClaudio Lanconelli ssfdc->logic_block_map[block_address] = 27451197abfSClaudio Lanconelli (unsigned short)phys_block; 27551197abfSClaudio Lanconelli 276289c0522SBrian Norris pr_debug("SSFDC_RO: build_block_map() phys_block=%d," 27751197abfSClaudio Lanconelli "logic_block_addr=%d, zone=%d\n", 27851197abfSClaudio Lanconelli phys_block, block_address, zone_index); 27951197abfSClaudio Lanconelli } 28051197abfSClaudio Lanconelli } 28151197abfSClaudio Lanconelli return 0; 28251197abfSClaudio Lanconelli } 28351197abfSClaudio Lanconelli 28451197abfSClaudio Lanconelli static void ssfdcr_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) 28551197abfSClaudio Lanconelli { 28651197abfSClaudio Lanconelli struct ssfdcr_record *ssfdc; 28751197abfSClaudio Lanconelli int cis_sector; 28851197abfSClaudio Lanconelli 28951197abfSClaudio Lanconelli /* Check for small page NAND flash */ 290818b9739SHuang Shijie if (!mtd_type_is_nand(mtd) || mtd->oobsize != OOB_SIZE || 29169423d99SAdrian Hunter mtd->size > UINT_MAX) 29251197abfSClaudio Lanconelli return; 29351197abfSClaudio Lanconelli 29451197abfSClaudio Lanconelli /* Check for SSDFC format by reading CIS/IDI sector */ 29551197abfSClaudio Lanconelli cis_sector = get_valid_cis_sector(mtd); 29651197abfSClaudio Lanconelli if (cis_sector == -1) 29751197abfSClaudio Lanconelli return; 29851197abfSClaudio Lanconelli 29951197abfSClaudio Lanconelli ssfdc = kzalloc(sizeof(struct ssfdcr_record), GFP_KERNEL); 3000870066dSBrian Norris if (!ssfdc) 30151197abfSClaudio Lanconelli return; 30251197abfSClaudio Lanconelli 30351197abfSClaudio Lanconelli ssfdc->mbd.mtd = mtd; 30451197abfSClaudio Lanconelli ssfdc->mbd.devnum = -1; 30551197abfSClaudio Lanconelli ssfdc->mbd.tr = tr; 30651197abfSClaudio Lanconelli ssfdc->mbd.readonly = 1; 30751197abfSClaudio Lanconelli 30851197abfSClaudio Lanconelli ssfdc->cis_block = cis_sector / (mtd->erasesize >> SECTOR_SHIFT); 30951197abfSClaudio Lanconelli ssfdc->erase_size = mtd->erasesize; 31069423d99SAdrian Hunter ssfdc->map_len = (u32)mtd->size / mtd->erasesize; 31151197abfSClaudio Lanconelli 312289c0522SBrian Norris pr_debug("SSFDC_RO: cis_block=%d,erase_size=%d,map_len=%d,n_zones=%d\n", 31351197abfSClaudio Lanconelli ssfdc->cis_block, ssfdc->erase_size, ssfdc->map_len, 314c8872b06SJulia Lawall DIV_ROUND_UP(ssfdc->map_len, MAX_PHYS_BLK_PER_ZONE)); 31551197abfSClaudio Lanconelli 31651197abfSClaudio Lanconelli /* Set geometry */ 31751197abfSClaudio Lanconelli ssfdc->heads = 16; 31851197abfSClaudio Lanconelli ssfdc->sectors = 32; 31951197abfSClaudio Lanconelli get_chs(mtd->size, NULL, &ssfdc->heads, &ssfdc->sectors); 32069423d99SAdrian Hunter ssfdc->cylinders = (unsigned short)(((u32)mtd->size >> SECTOR_SHIFT) / 32151197abfSClaudio Lanconelli ((long)ssfdc->sectors * (long)ssfdc->heads)); 32251197abfSClaudio Lanconelli 323289c0522SBrian Norris pr_debug("SSFDC_RO: using C:%d H:%d S:%d == %ld sects\n", 32451197abfSClaudio Lanconelli ssfdc->cylinders, ssfdc->heads , ssfdc->sectors, 32551197abfSClaudio Lanconelli (long)ssfdc->cylinders * (long)ssfdc->heads * 32651197abfSClaudio Lanconelli (long)ssfdc->sectors); 32751197abfSClaudio Lanconelli 32851197abfSClaudio Lanconelli ssfdc->mbd.size = (long)ssfdc->heads * (long)ssfdc->cylinders * 32951197abfSClaudio Lanconelli (long)ssfdc->sectors; 33051197abfSClaudio Lanconelli 33151197abfSClaudio Lanconelli /* Allocate logical block map */ 3326da2ec56SKees Cook ssfdc->logic_block_map = 3336da2ec56SKees Cook kmalloc_array(ssfdc->map_len, 3346da2ec56SKees Cook sizeof(ssfdc->logic_block_map[0]), GFP_KERNEL); 3350870066dSBrian Norris if (!ssfdc->logic_block_map) 33651197abfSClaudio Lanconelli goto out_err; 33751197abfSClaudio Lanconelli memset(ssfdc->logic_block_map, 0xff, sizeof(ssfdc->logic_block_map[0]) * 33851197abfSClaudio Lanconelli ssfdc->map_len); 33951197abfSClaudio Lanconelli 34051197abfSClaudio Lanconelli /* Build logical block map */ 34151197abfSClaudio Lanconelli if (build_logical_block_map(ssfdc) < 0) 34251197abfSClaudio Lanconelli goto out_err; 34351197abfSClaudio Lanconelli 34451197abfSClaudio Lanconelli /* Register device + partitions */ 34551197abfSClaudio Lanconelli if (add_mtd_blktrans_dev(&ssfdc->mbd)) 34651197abfSClaudio Lanconelli goto out_err; 34751197abfSClaudio Lanconelli 34851197abfSClaudio Lanconelli printk(KERN_INFO "SSFDC_RO: Found ssfdc%c on mtd%d (%s)\n", 34951197abfSClaudio Lanconelli ssfdc->mbd.devnum + 'a', mtd->index, mtd->name); 35051197abfSClaudio Lanconelli return; 35151197abfSClaudio Lanconelli 35251197abfSClaudio Lanconelli out_err: 35351197abfSClaudio Lanconelli kfree(ssfdc->logic_block_map); 35451197abfSClaudio Lanconelli kfree(ssfdc); 35551197abfSClaudio Lanconelli } 35651197abfSClaudio Lanconelli 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 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 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 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 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"); 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