diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/mtd/ssfdc.c')
-rw-r--r-- | ANDROID_3.4.5/drivers/mtd/ssfdc.c | 458 |
1 files changed, 0 insertions, 458 deletions
diff --git a/ANDROID_3.4.5/drivers/mtd/ssfdc.c b/ANDROID_3.4.5/drivers/mtd/ssfdc.c deleted file mode 100644 index ab2a52a0..00000000 --- a/ANDROID_3.4.5/drivers/mtd/ssfdc.c +++ /dev/null @@ -1,458 +0,0 @@ -/* - * Linux driver for SSFDC Flash Translation Layer (Read only) - * © 2005 Eptar srl - * Author: Claudio Lanconelli <lanconelli.claudio@eptar.com> - * - * Based on NTFL and MTDBLOCK_RO drivers - * - * 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. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/hdreg.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/nand.h> -#include <linux/mtd/blktrans.h> - -struct ssfdcr_record { - struct mtd_blktrans_dev mbd; - int usecount; - unsigned char heads; - unsigned char sectors; - unsigned short cylinders; - int cis_block; /* block n. containing CIS/IDI */ - int erase_size; /* phys_block_size */ - unsigned short *logic_block_map; /* all zones (max 8192 phys blocks on - the 128MiB) */ - int map_len; /* n. phys_blocks on the card */ -}; - -#define SSFDCR_MAJOR 257 -#define SSFDCR_PARTN_BITS 3 - -#define SECTOR_SIZE 512 -#define SECTOR_SHIFT 9 -#define OOB_SIZE 16 - -#define MAX_LOGIC_BLK_PER_ZONE 1000 -#define MAX_PHYS_BLK_PER_ZONE 1024 - -#define KiB(x) ( (x) * 1024L ) -#define MiB(x) ( KiB(x) * 1024L ) - -/** CHS Table - 1MiB 2MiB 4MiB 8MiB 16MiB 32MiB 64MiB 128MiB -NCylinder 125 125 250 250 500 500 500 500 -NHead 4 4 4 4 4 8 8 16 -NSector 4 8 8 16 16 16 32 32 -SumSector 2,000 4,000 8,000 16,000 32,000 64,000 128,000 256,000 -SectorSize 512 512 512 512 512 512 512 512 -**/ - -typedef struct { - unsigned long size; - unsigned short cyl; - unsigned char head; - unsigned char sec; -} chs_entry_t; - -/* Must be ordered by size */ -static const chs_entry_t chs_table[] = { - { MiB( 1), 125, 4, 4 }, - { MiB( 2), 125, 4, 8 }, - { MiB( 4), 250, 4, 8 }, - { MiB( 8), 250, 4, 16 }, - { MiB( 16), 500, 4, 16 }, - { MiB( 32), 500, 8, 16 }, - { MiB( 64), 500, 8, 32 }, - { MiB(128), 500, 16, 32 }, - { 0 }, -}; - -static int get_chs(unsigned long size, unsigned short *cyl, unsigned char *head, - unsigned char *sec) -{ - int k; - int found = 0; - - k = 0; - while (chs_table[k].size > 0 && size > chs_table[k].size) - k++; - - if (chs_table[k].size > 0) { - if (cyl) - *cyl = chs_table[k].cyl; - if (head) - *head = chs_table[k].head; - if (sec) - *sec = chs_table[k].sec; - found = 1; - } - - return found; -} - -/* These bytes are the signature for the CIS/IDI sector */ -static const uint8_t cis_numbers[] = { - 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20 -}; - -/* Read and check for a valid CIS sector */ -static int get_valid_cis_sector(struct mtd_info *mtd) -{ - int ret, k, cis_sector; - size_t retlen; - loff_t offset; - uint8_t *sect_buf; - - cis_sector = -1; - - sect_buf = kmalloc(SECTOR_SIZE, GFP_KERNEL); - if (!sect_buf) - goto out; - - /* - * Look for CIS/IDI sector on the first GOOD block (give up after 4 bad - * blocks). If the first good block doesn't contain CIS number the flash - * is not SSFDC formatted - */ - for (k = 0, offset = 0; k < 4; k++, offset += mtd->erasesize) { - if (mtd_block_isbad(mtd, offset)) { - ret = mtd_read(mtd, offset, SECTOR_SIZE, &retlen, - sect_buf); - - /* CIS pattern match on the sector buffer */ - if (ret < 0 || retlen != SECTOR_SIZE) { - printk(KERN_WARNING - "SSFDC_RO:can't read CIS/IDI sector\n"); - } else if (!memcmp(sect_buf, cis_numbers, - sizeof(cis_numbers))) { - /* Found */ - cis_sector = (int)(offset >> SECTOR_SHIFT); - } else { - pr_debug("SSFDC_RO: CIS/IDI sector not found" - " on %s (mtd%d)\n", mtd->name, - mtd->index); - } - break; - } - } - - kfree(sect_buf); - out: - return cis_sector; -} - -/* Read physical sector (wrapper to MTD_READ) */ -static int read_physical_sector(struct mtd_info *mtd, uint8_t *sect_buf, - int sect_no) -{ - int ret; - size_t retlen; - loff_t offset = (loff_t)sect_no << SECTOR_SHIFT; - - ret = mtd_read(mtd, offset, SECTOR_SIZE, &retlen, sect_buf); - if (ret < 0 || retlen != SECTOR_SIZE) - return -1; - - return 0; -} - -/* Read redundancy area (wrapper to MTD_READ_OOB */ -static int read_raw_oob(struct mtd_info *mtd, loff_t offs, uint8_t *buf) -{ - struct mtd_oob_ops ops; - int ret; - - ops.mode = MTD_OPS_RAW; - ops.ooboffs = 0; - ops.ooblen = OOB_SIZE; - ops.oobbuf = buf; - ops.datbuf = NULL; - - ret = mtd_read_oob(mtd, offs, &ops); - if (ret < 0 || ops.oobretlen != OOB_SIZE) - return -1; - - return 0; -} - -/* Parity calculator on a word of n bit size */ -static int get_parity(int number, int size) -{ - int k; - int parity; - - parity = 1; - for (k = 0; k < size; k++) { - parity += (number >> k); - parity &= 1; - } - return parity; -} - -/* Read and validate the logical block address field stored in the OOB */ -static int get_logical_address(uint8_t *oob_buf) -{ - int block_address, parity; - int offset[2] = {6, 11}; /* offset of the 2 address fields within OOB */ - int j; - int ok = 0; - - /* - * Look for the first valid logical address - * Valid address has fixed pattern on most significant bits and - * parity check - */ - for (j = 0; j < ARRAY_SIZE(offset); j++) { - block_address = ((int)oob_buf[offset[j]] << 8) | - oob_buf[offset[j]+1]; - - /* Check for the signature bits in the address field (MSBits) */ - if ((block_address & ~0x7FF) == 0x1000) { - parity = block_address & 0x01; - block_address &= 0x7FF; - block_address >>= 1; - - if (get_parity(block_address, 10) != parity) { - pr_debug("SSFDC_RO: logical address field%d" - "parity error(0x%04X)\n", j+1, - block_address); - } else { - ok = 1; - break; - } - } - } - - if (!ok) - block_address = -2; - - pr_debug("SSFDC_RO: get_logical_address() %d\n", - block_address); - - return block_address; -} - -/* Build the logic block map */ -static int build_logical_block_map(struct ssfdcr_record *ssfdc) -{ - unsigned long offset; - uint8_t oob_buf[OOB_SIZE]; - int ret, block_address, phys_block; - struct mtd_info *mtd = ssfdc->mbd.mtd; - - pr_debug("SSFDC_RO: build_block_map() nblks=%d (%luK)\n", - ssfdc->map_len, - (unsigned long)ssfdc->map_len * ssfdc->erase_size / 1024); - - /* Scan every physical block, skip CIS block */ - for (phys_block = ssfdc->cis_block + 1; phys_block < ssfdc->map_len; - phys_block++) { - offset = (unsigned long)phys_block * ssfdc->erase_size; - if (mtd_block_isbad(mtd, offset)) - continue; /* skip bad blocks */ - - ret = read_raw_oob(mtd, offset, oob_buf); - if (ret < 0) { - pr_debug("SSFDC_RO: mtd read_oob() failed at %lu\n", - offset); - return -1; - } - block_address = get_logical_address(oob_buf); - - /* Skip invalid addresses */ - if (block_address >= 0 && - block_address < MAX_LOGIC_BLK_PER_ZONE) { - int zone_index; - - zone_index = phys_block / MAX_PHYS_BLK_PER_ZONE; - block_address += zone_index * MAX_LOGIC_BLK_PER_ZONE; - ssfdc->logic_block_map[block_address] = - (unsigned short)phys_block; - - pr_debug("SSFDC_RO: build_block_map() phys_block=%d," - "logic_block_addr=%d, zone=%d\n", - phys_block, block_address, zone_index); - } - } - return 0; -} - -static void ssfdcr_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) -{ - struct ssfdcr_record *ssfdc; - int cis_sector; - - /* Check for small page NAND flash */ - if (mtd->type != MTD_NANDFLASH || mtd->oobsize != OOB_SIZE || - mtd->size > UINT_MAX) - return; - - /* Check for SSDFC format by reading CIS/IDI sector */ - cis_sector = get_valid_cis_sector(mtd); - if (cis_sector == -1) - return; - - ssfdc = kzalloc(sizeof(struct ssfdcr_record), GFP_KERNEL); - if (!ssfdc) - return; - - ssfdc->mbd.mtd = mtd; - ssfdc->mbd.devnum = -1; - ssfdc->mbd.tr = tr; - ssfdc->mbd.readonly = 1; - - ssfdc->cis_block = cis_sector / (mtd->erasesize >> SECTOR_SHIFT); - ssfdc->erase_size = mtd->erasesize; - ssfdc->map_len = (u32)mtd->size / mtd->erasesize; - - pr_debug("SSFDC_RO: cis_block=%d,erase_size=%d,map_len=%d,n_zones=%d\n", - ssfdc->cis_block, ssfdc->erase_size, ssfdc->map_len, - DIV_ROUND_UP(ssfdc->map_len, MAX_PHYS_BLK_PER_ZONE)); - - /* Set geometry */ - ssfdc->heads = 16; - ssfdc->sectors = 32; - get_chs(mtd->size, NULL, &ssfdc->heads, &ssfdc->sectors); - ssfdc->cylinders = (unsigned short)(((u32)mtd->size >> SECTOR_SHIFT) / - ((long)ssfdc->sectors * (long)ssfdc->heads)); - - pr_debug("SSFDC_RO: using C:%d H:%d S:%d == %ld sects\n", - ssfdc->cylinders, ssfdc->heads , ssfdc->sectors, - (long)ssfdc->cylinders * (long)ssfdc->heads * - (long)ssfdc->sectors); - - ssfdc->mbd.size = (long)ssfdc->heads * (long)ssfdc->cylinders * - (long)ssfdc->sectors; - - /* Allocate logical block map */ - ssfdc->logic_block_map = kmalloc(sizeof(ssfdc->logic_block_map[0]) * - ssfdc->map_len, GFP_KERNEL); - if (!ssfdc->logic_block_map) - goto out_err; - memset(ssfdc->logic_block_map, 0xff, sizeof(ssfdc->logic_block_map[0]) * - ssfdc->map_len); - - /* Build logical block map */ - if (build_logical_block_map(ssfdc) < 0) - goto out_err; - - /* Register device + partitions */ - if (add_mtd_blktrans_dev(&ssfdc->mbd)) - goto out_err; - - printk(KERN_INFO "SSFDC_RO: Found ssfdc%c on mtd%d (%s)\n", - ssfdc->mbd.devnum + 'a', mtd->index, mtd->name); - return; - -out_err: - kfree(ssfdc->logic_block_map); - kfree(ssfdc); -} - -static void ssfdcr_remove_dev(struct mtd_blktrans_dev *dev) -{ - struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev; - - pr_debug("SSFDC_RO: remove_dev (i=%d)\n", dev->devnum); - - del_mtd_blktrans_dev(dev); - kfree(ssfdc->logic_block_map); -} - -static int ssfdcr_readsect(struct mtd_blktrans_dev *dev, - unsigned long logic_sect_no, char *buf) -{ - struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev; - int sectors_per_block, offset, block_address; - - sectors_per_block = ssfdc->erase_size >> SECTOR_SHIFT; - offset = (int)(logic_sect_no % sectors_per_block); - block_address = (int)(logic_sect_no / sectors_per_block); - - pr_debug("SSFDC_RO: ssfdcr_readsect(%lu) sec_per_blk=%d, ofst=%d," - " block_addr=%d\n", logic_sect_no, sectors_per_block, offset, - block_address); - - if (block_address >= ssfdc->map_len) - BUG(); - - block_address = ssfdc->logic_block_map[block_address]; - - pr_debug("SSFDC_RO: ssfdcr_readsect() phys_block_addr=%d\n", - block_address); - - if (block_address < 0xffff) { - unsigned long sect_no; - - sect_no = (unsigned long)block_address * sectors_per_block + - offset; - - pr_debug("SSFDC_RO: ssfdcr_readsect() phys_sect_no=%lu\n", - sect_no); - - if (read_physical_sector(ssfdc->mbd.mtd, buf, sect_no) < 0) - return -EIO; - } else { - memset(buf, 0xff, SECTOR_SIZE); - } - - return 0; -} - -static int ssfdcr_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo) -{ - struct ssfdcr_record *ssfdc = (struct ssfdcr_record *)dev; - - pr_debug("SSFDC_RO: ssfdcr_getgeo() C=%d, H=%d, S=%d\n", - ssfdc->cylinders, ssfdc->heads, ssfdc->sectors); - - geo->heads = ssfdc->heads; - geo->sectors = ssfdc->sectors; - geo->cylinders = ssfdc->cylinders; - - return 0; -} - -/**************************************************************************** - * - * Module stuff - * - ****************************************************************************/ - -static struct mtd_blktrans_ops ssfdcr_tr = { - .name = "ssfdc", - .major = SSFDCR_MAJOR, - .part_bits = SSFDCR_PARTN_BITS, - .blksize = SECTOR_SIZE, - .getgeo = ssfdcr_getgeo, - .readsect = ssfdcr_readsect, - .add_mtd = ssfdcr_add_mtd, - .remove_dev = ssfdcr_remove_dev, - .owner = THIS_MODULE, -}; - -static int __init init_ssfdcr(void) -{ - printk(KERN_INFO "SSFDC read-only Flash Translation layer\n"); - - return register_mtd_blktrans(&ssfdcr_tr); -} - -static void __exit cleanup_ssfdcr(void) -{ - deregister_mtd_blktrans(&ssfdcr_tr); -} - -module_init(init_ssfdcr); -module_exit(cleanup_ssfdcr); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Claudio Lanconelli <lanconelli.claudio@eptar.com>"); -MODULE_DESCRIPTION("Flash Translation Layer for read-only SSFDC SmartMedia card"); |