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drivers/mtd/inftlcore.c
24.5 KB
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/* |
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* inftlcore.c -- Linux driver for Inverse Flash Translation Layer (INFTL) * |
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* Copyright © 2002, Greg Ungerer (gerg@snapgear.com) |
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* * Based heavily on the nftlcore.c code which is: |
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* Copyright © 1999 Machine Vision Holdings, Inc. * Copyright © 1999 David Woodhouse <dwmw2@infradead.org> |
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* |
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* This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ |
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#include <linux/kernel.h> #include <linux/module.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/sched.h> #include <linux/init.h> #include <linux/kmod.h> #include <linux/hdreg.h> #include <linux/mtd/mtd.h> #include <linux/mtd/nftl.h> #include <linux/mtd/inftl.h> |
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#include <linux/mtd/nand.h> |
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#include <linux/uaccess.h> |
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#include <asm/errno.h> #include <asm/io.h> /* * Maximum number of loops while examining next block, to have a * chance to detect consistency problems (they should never happen * because of the checks done in the mounting. */ #define MAX_LOOPS 10000 |
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static void inftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) { struct INFTLrecord *inftl; unsigned long temp; |
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if (!mtd_type_is_nand(mtd) || mtd->size > UINT_MAX) |
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return; /* OK, this is moderately ugly. But probably safe. Alternatives? */ if (memcmp(mtd->name, "DiskOnChip", 10)) return; |
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if (!mtd->_block_isbad) { |
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printk(KERN_ERR "INFTL no longer supports the old DiskOnChip drivers loaded via docprobe. " "Please use the new diskonchip driver under the NAND subsystem. "); return; } |
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pr_debug("INFTL: add_mtd for %s ", mtd->name); |
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|
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inftl = kzalloc(sizeof(*inftl), GFP_KERNEL); |
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|
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if (!inftl) |
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return; |
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inftl->mbd.mtd = mtd; inftl->mbd.devnum = -1; |
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|
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inftl->mbd.tr = tr; |
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|
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if (INFTL_mount(inftl) < 0) { |
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printk(KERN_WARNING "INFTL: could not mount device "); kfree(inftl); return; |
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} |
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/* OK, it's a new one. Set up all the data structures. */ /* Calculate geometry */ inftl->cylinders = 1024; inftl->heads = 16; temp = inftl->cylinders * inftl->heads; inftl->sectors = inftl->mbd.size / temp; if (inftl->mbd.size % temp) { inftl->sectors++; temp = inftl->cylinders * inftl->sectors; inftl->heads = inftl->mbd.size / temp; if (inftl->mbd.size % temp) { inftl->heads++; temp = inftl->heads * inftl->sectors; inftl->cylinders = inftl->mbd.size / temp; } } if (inftl->mbd.size != inftl->heads * inftl->cylinders * inftl->sectors) { /* |
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Oh no we don't have |
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mbd.size == heads * cylinders * sectors */ printk(KERN_WARNING "INFTL: cannot calculate a geometry to " "match size of 0x%lx. ", inftl->mbd.size); printk(KERN_WARNING "INFTL: using C:%d H:%d S:%d " "(== 0x%lx sects) ", |
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inftl->cylinders, inftl->heads , inftl->sectors, |
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(long)inftl->cylinders * (long)inftl->heads * (long)inftl->sectors ); } if (add_mtd_blktrans_dev(&inftl->mbd)) { |
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kfree(inftl->PUtable); kfree(inftl->VUtable); |
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kfree(inftl); return; } #ifdef PSYCHO_DEBUG |
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printk(KERN_INFO "INFTL: Found new inftl%c ", inftl->mbd.devnum + 'a'); |
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#endif return; } static void inftl_remove_dev(struct mtd_blktrans_dev *dev) { struct INFTLrecord *inftl = (void *)dev; |
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pr_debug("INFTL: remove_dev (i=%d) ", dev->devnum); |
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del_mtd_blktrans_dev(dev); |
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kfree(inftl->PUtable); kfree(inftl->VUtable); |
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} /* * Actual INFTL access routines. */ /* |
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* Read oob data from flash */ int inftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len, size_t *retlen, uint8_t *buf) { struct mtd_oob_ops ops; int res; |
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ops.mode = MTD_OPS_PLACE_OOB; |
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ops.ooboffs = offs & (mtd->writesize - 1); ops.ooblen = len; ops.oobbuf = buf; ops.datbuf = NULL; |
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|
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res = mtd_read_oob(mtd, offs & ~(mtd->writesize - 1), &ops); |
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*retlen = ops.oobretlen; |
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return res; } /* * Write oob data to flash */ int inftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len, size_t *retlen, uint8_t *buf) { struct mtd_oob_ops ops; int res; |
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ops.mode = MTD_OPS_PLACE_OOB; |
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ops.ooboffs = offs & (mtd->writesize - 1); ops.ooblen = len; ops.oobbuf = buf; ops.datbuf = NULL; |
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res = mtd_write_oob(mtd, offs & ~(mtd->writesize - 1), &ops); |
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*retlen = ops.oobretlen; |
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return res; } /* * Write data and oob to flash */ static int inftl_write(struct mtd_info *mtd, loff_t offs, size_t len, size_t *retlen, uint8_t *buf, uint8_t *oob) { struct mtd_oob_ops ops; int res; |
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ops.mode = MTD_OPS_PLACE_OOB; |
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ops.ooboffs = offs; ops.ooblen = mtd->oobsize; ops.oobbuf = oob; ops.datbuf = buf; ops.len = len; |
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res = mtd_write_oob(mtd, offs & ~(mtd->writesize - 1), &ops); |
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*retlen = ops.retlen; return res; } /* |
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* INFTL_findfreeblock: Find a free Erase Unit on the INFTL partition. * This function is used when the give Virtual Unit Chain. */ static u16 INFTL_findfreeblock(struct INFTLrecord *inftl, int desperate) { u16 pot = inftl->LastFreeEUN; int silly = inftl->nb_blocks; |
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pr_debug("INFTL: INFTL_findfreeblock(inftl=%p,desperate=%d) ", inftl, desperate); |
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/* * Normally, we force a fold to happen before we run out of free * blocks completely. */ if (!desperate && inftl->numfreeEUNs < 2) { |
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pr_debug("INFTL: there are too few free EUNs (%d) ", inftl->numfreeEUNs); |
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return BLOCK_NIL; |
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} /* Scan for a free block */ do { if (inftl->PUtable[pot] == BLOCK_FREE) { inftl->LastFreeEUN = pot; return pot; } if (++pot > inftl->lastEUN) pot = 0; if (!silly--) { printk(KERN_WARNING "INFTL: no free blocks found! " "EUN range = %d - %d ", 0, inftl->LastFreeEUN); return BLOCK_NIL; } } while (pot != inftl->LastFreeEUN); return BLOCK_NIL; } static u16 INFTL_foldchain(struct INFTLrecord *inftl, unsigned thisVUC, unsigned pendingblock) { u16 BlockMap[MAX_SECTORS_PER_UNIT]; unsigned char BlockDeleted[MAX_SECTORS_PER_UNIT]; unsigned int thisEUN, prevEUN, status; |
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struct mtd_info *mtd = inftl->mbd.mtd; |
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int block, silly; unsigned int targetEUN; struct inftl_oob oob; |
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size_t retlen; |
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|
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pr_debug("INFTL: INFTL_foldchain(inftl=%p,thisVUC=%d,pending=%d) ", inftl, thisVUC, pendingblock); |
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memset(BlockMap, 0xff, sizeof(BlockMap)); memset(BlockDeleted, 0, sizeof(BlockDeleted)); thisEUN = targetEUN = inftl->VUtable[thisVUC]; if (thisEUN == BLOCK_NIL) { printk(KERN_WARNING "INFTL: trying to fold non-existent " "Virtual Unit Chain %d! ", thisVUC); return BLOCK_NIL; } |
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|
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/* * Scan to find the Erase Unit which holds the actual data for each * 512-byte block within the Chain. */ |
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silly = MAX_LOOPS; |
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while (thisEUN < inftl->nb_blocks) { for (block = 0; block < inftl->EraseSize/SECTORSIZE; block ++) { |
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if ((BlockMap[block] != BLOCK_NIL) || BlockDeleted[block]) |
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continue; |
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if (inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) + (block * SECTORSIZE), 16, &retlen, (char *)&oob) < 0) |
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status = SECTOR_IGNORE; else |
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status = oob.b.Status | oob.b.Status1; |
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switch(status) { case SECTOR_FREE: case SECTOR_IGNORE: break; case SECTOR_USED: BlockMap[block] = thisEUN; continue; case SECTOR_DELETED: BlockDeleted[block] = 1; continue; default: printk(KERN_WARNING "INFTL: unknown status " "for block %d in EUN %d: %x ", block, thisEUN, status); break; } } if (!silly--) { printk(KERN_WARNING "INFTL: infinite loop in Virtual " "Unit Chain 0x%x ", thisVUC); return BLOCK_NIL; } |
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|
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thisEUN = inftl->PUtable[thisEUN]; } /* * OK. We now know the location of every block in the Virtual Unit * Chain, and the Erase Unit into which we are supposed to be copying. * Go for it. */ |
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pr_debug("INFTL: folding chain %d into unit %d ", thisVUC, targetEUN); |
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for (block = 0; block < inftl->EraseSize/SECTORSIZE ; block++) { unsigned char movebuf[SECTORSIZE]; int ret; /* * If it's in the target EUN already, or if it's pending write, * do nothing. */ if (BlockMap[block] == targetEUN || (pendingblock == (thisVUC * (inftl->EraseSize / SECTORSIZE) + block))) { continue; } |
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/* |
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* Copy only in non free block (free blocks can only * happen in case of media errors or deleted blocks). */ |
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if (BlockMap[block] == BLOCK_NIL) continue; |
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|
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ret = mtd_read(mtd, (inftl->EraseSize * BlockMap[block]) + (block * SECTORSIZE), SECTORSIZE, &retlen, movebuf); |
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if (ret < 0 && !mtd_is_bitflip(ret)) { |
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ret = mtd_read(mtd, (inftl->EraseSize * BlockMap[block]) + (block * SECTORSIZE), SECTORSIZE, &retlen, movebuf); |
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if (ret != -EIO) |
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pr_debug("INFTL: error went away on retry? "); |
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} memset(&oob, 0xff, sizeof(struct inftl_oob)); oob.b.Status = oob.b.Status1 = SECTOR_USED; |
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inftl_write(inftl->mbd.mtd, (inftl->EraseSize * targetEUN) + (block * SECTORSIZE), SECTORSIZE, &retlen, movebuf, (char *)&oob); |
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} /* * Newest unit in chain now contains data from _all_ older units. * So go through and erase each unit in chain, oldest first. (This * is important, by doing oldest first if we crash/reboot then it * it is relatively simple to clean up the mess). */ |
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pr_debug("INFTL: want to erase virtual chain %d ", thisVUC); |
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for (;;) { /* Find oldest unit in chain. */ thisEUN = inftl->VUtable[thisVUC]; prevEUN = BLOCK_NIL; while (inftl->PUtable[thisEUN] != BLOCK_NIL) { prevEUN = thisEUN; thisEUN = inftl->PUtable[thisEUN]; } /* Check if we are all done */ if (thisEUN == targetEUN) break; |
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/* Unlink the last block from the chain. */ inftl->PUtable[prevEUN] = BLOCK_NIL; /* Now try to erase it. */ |
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if (INFTL_formatblock(inftl, thisEUN) < 0) { |
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/* * Could not erase : mark block as reserved. */ inftl->PUtable[thisEUN] = BLOCK_RESERVED; |
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} else { |
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/* Correctly erased : mark it as free */ inftl->PUtable[thisEUN] = BLOCK_FREE; |
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inftl->numfreeEUNs++; |
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} |
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} return targetEUN; } static u16 INFTL_makefreeblock(struct INFTLrecord *inftl, unsigned pendingblock) { /* |
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* This is the part that needs some cleverness applied. |
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* For now, I'm doing the minimum applicable to actually * get the thing to work. * Wear-levelling and other clever stuff needs to be implemented * and we also need to do some assessment of the results when * the system loses power half-way through the routine. */ u16 LongestChain = 0; u16 ChainLength = 0, thislen; u16 chain, EUN; |
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pr_debug("INFTL: INFTL_makefreeblock(inftl=%p," |
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"pending=%d) ", inftl, pendingblock); for (chain = 0; chain < inftl->nb_blocks; chain++) { EUN = inftl->VUtable[chain]; thislen = 0; while (EUN <= inftl->lastEUN) { thislen++; EUN = inftl->PUtable[EUN]; if (thislen > 0xff00) { printk(KERN_WARNING "INFTL: endless loop in " "Virtual Chain %d: Unit %x ", chain, EUN); /* * Actually, don't return failure. * Just ignore this chain and get on with it. */ thislen = 0; break; } } if (thislen > ChainLength) { ChainLength = thislen; LongestChain = chain; } } if (ChainLength < 2) { printk(KERN_WARNING "INFTL: no Virtual Unit Chains available " "for folding. Failing request "); return BLOCK_NIL; } return INFTL_foldchain(inftl, LongestChain, pendingblock); } static int nrbits(unsigned int val, int bitcount) { int i, total = 0; for (i = 0; (i < bitcount); i++) total += (((0x1 << i) & val) ? 1 : 0); return total; } /* |
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* INFTL_findwriteunit: Return the unit number into which we can write |
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* for this block. Make it available if it isn't already. */ static inline u16 INFTL_findwriteunit(struct INFTLrecord *inftl, unsigned block) { unsigned int thisVUC = block / (inftl->EraseSize / SECTORSIZE); unsigned int thisEUN, writeEUN, prev_block, status; unsigned long blockofs = (block * SECTORSIZE) & (inftl->EraseSize -1); |
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struct mtd_info *mtd = inftl->mbd.mtd; |
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struct inftl_oob oob; struct inftl_bci bci; unsigned char anac, nacs, parity; size_t retlen; int silly, silly2 = 3; |
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pr_debug("INFTL: INFTL_findwriteunit(inftl=%p,block=%d) ", inftl, block); |
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do { /* * Scan the media to find a unit in the VUC which has * a free space for the block in question. */ writeEUN = BLOCK_NIL; thisEUN = inftl->VUtable[thisVUC]; silly = MAX_LOOPS; while (thisEUN <= inftl->lastEUN) { |
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inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) + blockofs, 8, &retlen, (char *)&bci); |
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|
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status = bci.Status | bci.Status1; |
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pr_debug("INFTL: status of block %d in EUN %d is %x ", block , writeEUN, status); |
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switch(status) { case SECTOR_FREE: writeEUN = thisEUN; break; case SECTOR_DELETED: case SECTOR_USED: /* Can't go any further */ goto hitused; case SECTOR_IGNORE: break; default: /* * Invalid block. Don't use it any more. * Must implement. */ |
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break; |
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} |
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if (!silly--) { |
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printk(KERN_WARNING "INFTL: infinite loop in " "Virtual Unit Chain 0x%x ", thisVUC); |
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return BLOCK_NIL; |
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} /* Skip to next block in chain */ thisEUN = inftl->PUtable[thisEUN]; } hitused: if (writeEUN != BLOCK_NIL) return writeEUN; /* |
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* OK. We didn't find one in the existing chain, or there |
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* is no existing chain. Allocate a new one. */ writeEUN = INFTL_findfreeblock(inftl, 0); if (writeEUN == BLOCK_NIL) { /* * That didn't work - there were no free blocks just * waiting to be picked up. We're going to have to fold * a chain to make room. */ |
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thisEUN = INFTL_makefreeblock(inftl, block); |
1da177e4c Linux-2.6.12-rc2 |
557 558 559 560 561 |
/* * Hopefully we free something, lets try again. * This time we are desperate... */ |
0a32a1026 mtd: cleanup styl... |
562 563 564 565 |
pr_debug("INFTL: using desperate==1 to find free EUN " "to accommodate write to VUC %d ", thisVUC); |
1da177e4c Linux-2.6.12-rc2 |
566 567 568 569 |
writeEUN = INFTL_findfreeblock(inftl, 1); if (writeEUN == BLOCK_NIL) { /* * Ouch. This should never happen - we should |
97894cda5 [MTD] core: Clean... |
570 571 |
* always be able to make some room somehow. * If we get here, we've allocated more storage |
1da177e4c Linux-2.6.12-rc2 |
572 573 574 575 576 577 578 579 580 581 582 |
* space than actual media, or our makefreeblock * routine is missing something. */ printk(KERN_WARNING "INFTL: cannot make free " "space. "); #ifdef DEBUG INFTL_dumptables(inftl); INFTL_dumpVUchains(inftl); #endif return BLOCK_NIL; |
97894cda5 [MTD] core: Clean... |
583 |
} |
1da177e4c Linux-2.6.12-rc2 |
584 585 586 587 588 589 590 591 592 593 |
} /* * Insert new block into virtual chain. Firstly update the * block headers in flash... */ anac = 0; nacs = 0; thisEUN = inftl->VUtable[thisVUC]; if (thisEUN != BLOCK_NIL) { |
8593fbc68 [MTD] Rework the ... |
594 595 |
inftl_read_oob(mtd, thisEUN * inftl->EraseSize + 8, 8, &retlen, (char *)&oob.u); |
1da177e4c Linux-2.6.12-rc2 |
596 597 598 599 600 601 602 603 604 605 606 607 |
anac = oob.u.a.ANAC + 1; nacs = oob.u.a.NACs + 1; } prev_block = inftl->VUtable[thisVUC]; if (prev_block < inftl->nb_blocks) prev_block -= inftl->firstEUN; parity = (nrbits(thisVUC, 16) & 0x1) ? 0x1 : 0; parity |= (nrbits(prev_block, 16) & 0x1) ? 0x2 : 0; parity |= (nrbits(anac, 8) & 0x1) ? 0x4 : 0; parity |= (nrbits(nacs, 8) & 0x1) ? 0x8 : 0; |
97894cda5 [MTD] core: Clean... |
608 |
|
1da177e4c Linux-2.6.12-rc2 |
609 610 611 612 613 614 |
oob.u.a.virtualUnitNo = cpu_to_le16(thisVUC); oob.u.a.prevUnitNo = cpu_to_le16(prev_block); oob.u.a.ANAC = anac; oob.u.a.NACs = nacs; oob.u.a.parityPerField = parity; oob.u.a.discarded = 0xaa; |
8593fbc68 [MTD] Rework the ... |
615 616 |
inftl_write_oob(mtd, writeEUN * inftl->EraseSize + 8, 8, &retlen, (char *)&oob.u); |
1da177e4c Linux-2.6.12-rc2 |
617 618 619 620 621 622 623 624 |
/* Also back up header... */ oob.u.b.virtualUnitNo = cpu_to_le16(thisVUC); oob.u.b.prevUnitNo = cpu_to_le16(prev_block); oob.u.b.ANAC = anac; oob.u.b.NACs = nacs; oob.u.b.parityPerField = parity; oob.u.b.discarded = 0xaa; |
8593fbc68 [MTD] Rework the ... |
625 626 |
inftl_write_oob(mtd, writeEUN * inftl->EraseSize + SECTORSIZE * 4 + 8, 8, &retlen, (char *)&oob.u); |
1da177e4c Linux-2.6.12-rc2 |
627 628 629 630 631 632 633 634 635 636 637 638 |
inftl->PUtable[writeEUN] = inftl->VUtable[thisVUC]; inftl->VUtable[thisVUC] = writeEUN; inftl->numfreeEUNs--; return writeEUN; } while (silly2--); printk(KERN_WARNING "INFTL: error folding to make room for Virtual " "Unit Chain 0x%x ", thisVUC); |
70ec3bb8e mtd: Use BLOCK_NI... |
639 |
return BLOCK_NIL; |
1da177e4c Linux-2.6.12-rc2 |
640 641 642 643 644 645 646 |
} /* * Given a Virtual Unit Chain, see if it can be deleted, and if so do it. */ static void INFTL_trydeletechain(struct INFTLrecord *inftl, unsigned thisVUC) { |
f4a43cfce [MTD] Remove sill... |
647 |
struct mtd_info *mtd = inftl->mbd.mtd; |
1da177e4c Linux-2.6.12-rc2 |
648 649 650 651 652 653 |
unsigned char BlockUsed[MAX_SECTORS_PER_UNIT]; unsigned char BlockDeleted[MAX_SECTORS_PER_UNIT]; unsigned int thisEUN, status; int block, silly; struct inftl_bci bci; size_t retlen; |
289c05222 mtd: replace DEBU... |
654 |
pr_debug("INFTL: INFTL_trydeletechain(inftl=%p," |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 658 659 660 661 662 663 664 665 666 667 |
"thisVUC=%d) ", inftl, thisVUC); memset(BlockUsed, 0, sizeof(BlockUsed)); memset(BlockDeleted, 0, sizeof(BlockDeleted)); thisEUN = inftl->VUtable[thisVUC]; if (thisEUN == BLOCK_NIL) { printk(KERN_WARNING "INFTL: trying to delete non-existent " "Virtual Unit Chain %d! ", thisVUC); return; } |
97894cda5 [MTD] core: Clean... |
668 |
|
1da177e4c Linux-2.6.12-rc2 |
669 670 671 672 673 674 675 676 677 |
/* * Scan through the Erase Units to determine whether any data is in * each of the 512-byte blocks within the Chain. */ silly = MAX_LOOPS; while (thisEUN < inftl->nb_blocks) { for (block = 0; block < inftl->EraseSize/SECTORSIZE; block++) { if (BlockUsed[block] || BlockDeleted[block]) continue; |
8593fbc68 [MTD] Rework the ... |
678 679 |
if (inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) + (block * SECTORSIZE), 8 , &retlen, |
f4a43cfce [MTD] Remove sill... |
680 |
(char *)&bci) < 0) |
1da177e4c Linux-2.6.12-rc2 |
681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 |
status = SECTOR_IGNORE; else status = bci.Status | bci.Status1; switch(status) { case SECTOR_FREE: case SECTOR_IGNORE: break; case SECTOR_USED: BlockUsed[block] = 1; continue; case SECTOR_DELETED: BlockDeleted[block] = 1; continue; default: printk(KERN_WARNING "INFTL: unknown status " "for block %d in EUN %d: 0x%x ", block, thisEUN, status); } } if (!silly--) { printk(KERN_WARNING "INFTL: infinite loop in Virtual " "Unit Chain 0x%x ", thisVUC); return; } |
97894cda5 [MTD] core: Clean... |
709 |
|
1da177e4c Linux-2.6.12-rc2 |
710 711 712 713 714 715 716 717 718 719 720 |
thisEUN = inftl->PUtable[thisEUN]; } for (block = 0; block < inftl->EraseSize/SECTORSIZE; block++) if (BlockUsed[block]) return; /* * For each block in the chain free it and make it available * for future use. Erase from the oldest unit first. */ |
289c05222 mtd: replace DEBU... |
721 722 |
pr_debug("INFTL: deleting empty VUC %d ", thisVUC); |
1da177e4c Linux-2.6.12-rc2 |
723 724 725 726 727 728 729 |
for (;;) { u16 *prevEUN = &inftl->VUtable[thisVUC]; thisEUN = *prevEUN; /* If the chain is all gone already, we're done */ if (thisEUN == BLOCK_NIL) { |
289c05222 mtd: replace DEBU... |
730 731 |
pr_debug("INFTL: Empty VUC %d for deletion was already absent ", thisEUN); |
1da177e4c Linux-2.6.12-rc2 |
732 733 734 735 736 737 738 739 740 741 |
return; } /* Find oldest unit in chain. */ while (inftl->PUtable[thisEUN] != BLOCK_NIL) { BUG_ON(thisEUN >= inftl->nb_blocks); prevEUN = &inftl->PUtable[thisEUN]; thisEUN = *prevEUN; } |
289c05222 mtd: replace DEBU... |
742 743 |
pr_debug("Deleting EUN %d from VUC %d ", |
1da177e4c Linux-2.6.12-rc2 |
744 |
thisEUN, thisVUC); |
9223a456d [MTD] Remove read... |
745 |
if (INFTL_formatblock(inftl, thisEUN) < 0) { |
1da177e4c Linux-2.6.12-rc2 |
746 747 748 749 |
/* * Could not erase : mark block as reserved. */ inftl->PUtable[thisEUN] = BLOCK_RESERVED; |
9223a456d [MTD] Remove read... |
750 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 |
/* Correctly erased : mark it as free */ inftl->PUtable[thisEUN] = BLOCK_FREE; inftl->numfreeEUNs++; } /* Now sort out whatever was pointing to it... */ *prevEUN = BLOCK_NIL; /* Ideally we'd actually be responsive to new requests while we're doing this -- if there's free space why should others be made to wait? */ cond_resched(); } inftl->VUtable[thisVUC] = BLOCK_NIL; } static int INFTL_deleteblock(struct INFTLrecord *inftl, unsigned block) { unsigned int thisEUN = inftl->VUtable[block / (inftl->EraseSize / SECTORSIZE)]; unsigned long blockofs = (block * SECTORSIZE) & (inftl->EraseSize - 1); |
f4a43cfce [MTD] Remove sill... |
772 |
struct mtd_info *mtd = inftl->mbd.mtd; |
1da177e4c Linux-2.6.12-rc2 |
773 774 775 776 |
unsigned int status; int silly = MAX_LOOPS; size_t retlen; struct inftl_bci bci; |
289c05222 mtd: replace DEBU... |
777 |
pr_debug("INFTL: INFTL_deleteblock(inftl=%p," |
1da177e4c Linux-2.6.12-rc2 |
778 779 780 781 |
"block=%d) ", inftl, block); while (thisEUN < inftl->nb_blocks) { |
8593fbc68 [MTD] Rework the ... |
782 783 |
if (inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) + blockofs, 8, &retlen, (char *)&bci) < 0) |
1da177e4c Linux-2.6.12-rc2 |
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 |
status = SECTOR_IGNORE; else status = bci.Status | bci.Status1; switch (status) { case SECTOR_FREE: case SECTOR_IGNORE: break; case SECTOR_DELETED: thisEUN = BLOCK_NIL; goto foundit; case SECTOR_USED: goto foundit; default: printk(KERN_WARNING "INFTL: unknown status for " "block %d in EUN %d: 0x%x ", block, thisEUN, status); break; } if (!silly--) { printk(KERN_WARNING "INFTL: infinite loop in Virtual " "Unit Chain 0x%x ", block / (inftl->EraseSize / SECTORSIZE)); return 1; } thisEUN = inftl->PUtable[thisEUN]; } foundit: if (thisEUN != BLOCK_NIL) { loff_t ptr = (thisEUN * inftl->EraseSize) + blockofs; |
8593fbc68 [MTD] Rework the ... |
818 |
if (inftl_read_oob(mtd, ptr, 8, &retlen, (char *)&bci) < 0) |
1da177e4c Linux-2.6.12-rc2 |
819 820 |
return -EIO; bci.Status = bci.Status1 = SECTOR_DELETED; |
8593fbc68 [MTD] Rework the ... |
821 |
if (inftl_write_oob(mtd, ptr, 8, &retlen, (char *)&bci) < 0) |
1da177e4c Linux-2.6.12-rc2 |
822 823 824 825 826 |
return -EIO; INFTL_trydeletechain(inftl, block / (inftl->EraseSize / SECTORSIZE)); } return 0; } |
97894cda5 [MTD] core: Clean... |
827 |
static int inftl_writeblock(struct mtd_blktrans_dev *mbd, unsigned long block, |
1da177e4c Linux-2.6.12-rc2 |
828 829 830 831 832 833 834 835 |
char *buffer) { struct INFTLrecord *inftl = (void *)mbd; unsigned int writeEUN; unsigned long blockofs = (block * SECTORSIZE) & (inftl->EraseSize - 1); size_t retlen; struct inftl_oob oob; char *p, *pend; |
289c05222 mtd: replace DEBU... |
836 |
pr_debug("INFTL: inftl_writeblock(inftl=%p,block=%ld," |
1da177e4c Linux-2.6.12-rc2 |
837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 |
"buffer=%p) ", inftl, block, buffer); /* Is block all zero? */ pend = buffer + SECTORSIZE; for (p = buffer; p < pend && !*p; p++) ; if (p < pend) { writeEUN = INFTL_findwriteunit(inftl, block); if (writeEUN == BLOCK_NIL) { printk(KERN_WARNING "inftl_writeblock(): cannot find " "block to write to "); /* * If we _still_ haven't got a block to use, * we're screwed. */ return 1; } memset(&oob, 0xff, sizeof(struct inftl_oob)); oob.b.Status = oob.b.Status1 = SECTOR_USED; |
9223a456d [MTD] Remove read... |
861 |
|
8593fbc68 [MTD] Rework the ... |
862 863 864 |
inftl_write(inftl->mbd.mtd, (writeEUN * inftl->EraseSize) + blockofs, SECTORSIZE, &retlen, (char *)buffer, (char *)&oob); |
1da177e4c Linux-2.6.12-rc2 |
865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 |
/* * need to write SECTOR_USED flags since they are not written * in mtd_writeecc */ } else { INFTL_deleteblock(inftl, block); } return 0; } static int inftl_readblock(struct mtd_blktrans_dev *mbd, unsigned long block, char *buffer) { struct INFTLrecord *inftl = (void *)mbd; unsigned int thisEUN = inftl->VUtable[block / (inftl->EraseSize / SECTORSIZE)]; unsigned long blockofs = (block * SECTORSIZE) & (inftl->EraseSize - 1); |
f4a43cfce [MTD] Remove sill... |
882 |
struct mtd_info *mtd = inftl->mbd.mtd; |
9223a456d [MTD] Remove read... |
883 |
unsigned int status; |
1da177e4c Linux-2.6.12-rc2 |
884 |
int silly = MAX_LOOPS; |
9223a456d [MTD] Remove read... |
885 |
struct inftl_bci bci; |
1da177e4c Linux-2.6.12-rc2 |
886 |
size_t retlen; |
289c05222 mtd: replace DEBU... |
887 |
pr_debug("INFTL: inftl_readblock(inftl=%p,block=%ld," |
1da177e4c Linux-2.6.12-rc2 |
888 889 890 891 |
"buffer=%p) ", inftl, block, buffer); while (thisEUN < inftl->nb_blocks) { |
8593fbc68 [MTD] Rework the ... |
892 |
if (inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) + |
f4a43cfce [MTD] Remove sill... |
893 |
blockofs, 8, &retlen, (char *)&bci) < 0) |
1da177e4c Linux-2.6.12-rc2 |
894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 |
status = SECTOR_IGNORE; else status = bci.Status | bci.Status1; switch (status) { case SECTOR_DELETED: thisEUN = BLOCK_NIL; goto foundit; case SECTOR_USED: goto foundit; case SECTOR_FREE: case SECTOR_IGNORE: break; default: printk(KERN_WARNING "INFTL: unknown status for " "block %ld in EUN %d: 0x%04x ", block, thisEUN, status); break; } if (!silly--) { printk(KERN_WARNING "INFTL: infinite loop in " "Virtual Unit Chain 0x%lx ", block / (inftl->EraseSize / SECTORSIZE)); return 1; } thisEUN = inftl->PUtable[thisEUN]; } foundit: if (thisEUN == BLOCK_NIL) { /* The requested block is not on the media, return all 0x00 */ memset(buffer, 0, SECTORSIZE); } else { |
9223a456d [MTD] Remove read... |
931 |
size_t retlen; |
1da177e4c Linux-2.6.12-rc2 |
932 |
loff_t ptr = (thisEUN * inftl->EraseSize) + blockofs; |
329ad399a mtd: introduce mt... |
933 |
int ret = mtd_read(mtd, ptr, SECTORSIZE, &retlen, buffer); |
9a1fcdfd4 [MTD] NAND Signal... |
934 935 |
/* Handle corrected bit flips gracefully */ |
d57f40544 mtd: utilize `mtd... |
936 |
if (ret < 0 && !mtd_is_bitflip(ret)) |
1da177e4c Linux-2.6.12-rc2 |
937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 |
return -EIO; } return 0; } static int inftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo) { struct INFTLrecord *inftl = (void *)dev; geo->heads = inftl->heads; geo->sectors = inftl->sectors; geo->cylinders = inftl->cylinders; return 0; } static struct mtd_blktrans_ops inftl_tr = { .name = "inftl", .major = INFTL_MAJOR, .part_bits = INFTL_PARTN_BITS, |
191876729 [MTD] Allow varia... |
957 |
.blksize = 512, |
1da177e4c Linux-2.6.12-rc2 |
958 959 960 961 962 963 964 |
.getgeo = inftl_getgeo, .readsect = inftl_readblock, .writesect = inftl_writeblock, .add_mtd = inftl_add_mtd, .remove_dev = inftl_remove_dev, .owner = THIS_MODULE, }; |
1da177e4c Linux-2.6.12-rc2 |
965 966 |
static int __init init_inftl(void) { |
1da177e4c Linux-2.6.12-rc2 |
967 968 969 970 971 972 973 974 975 976 977 978 979 980 |
return register_mtd_blktrans(&inftl_tr); } static void __exit cleanup_inftl(void) { deregister_mtd_blktrans(&inftl_tr); } module_init(init_inftl); module_exit(cleanup_inftl); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>, David Woodhouse <dwmw2@infradead.org>, Fabrice Bellard <fabrice.bellard@netgem.com> et al."); MODULE_DESCRIPTION("Support code for Inverse Flash Translation Layer, used on M-Systems DiskOnChip 2000, Millennium and Millennium Plus"); |