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Diffstat (limited to 'ANDROID_3.4.5/drivers/mtd/ssfdc.c')
-rw-r--r--ANDROID_3.4.5/drivers/mtd/ssfdc.c458
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");