Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753838Ab0AHPMO (ORCPT ); Fri, 8 Jan 2010 10:12:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753643Ab0AHPMM (ORCPT ); Fri, 8 Jan 2010 10:12:12 -0500 Received: from mail-fx0-f225.google.com ([209.85.220.225]:46565 "EHLO mail-fx0-f225.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753416Ab0AHPMK (ORCPT ); Fri, 8 Jan 2010 10:12:10 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=HFMryajixZ/YLHe35QNMfwtM+pS1kUivqjOm91bjEGyWoRzsk+KryT8XR5rRx6Ty5O 1ysX7+1m1lmr/vk8wg+RbrSTI0HHZdvx+gFR/sdWejGqRc4pb/1qRvcHwuIyRMywry8F NA1Z0qL0zCAV63DVMkgCeTjC/GpQs89mZjFVE= Subject: [PATCH 9/9] mtd: Add new SmartMedia/xD FTL From: Maxim Levitsky To: linux-kernel Cc: linux-mtd , Alex Dubov , joern In-Reply-To: <1262963092.12577.14.camel@maxim-laptop> References: <1262963092.12577.14.camel@maxim-laptop> Content-Type: text/plain; charset="UTF-8" Date: Fri, 08 Jan 2010 17:12:04 +0200 Message-ID: <1262963524.12577.23.camel@maxim-laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 30683 Lines: 1199 >From 743f723b6e7134cf9d99a158f3ac920c180d406a Mon Sep 17 00:00:00 2001 From: Maxim Levitsky Date: Fri, 8 Jan 2010 16:44:07 +0200 Subject: [PATCH 9/9] mtd: Add new SmartMedia/xD FTL This implements new readwrite SmartMedia/xd FTL. It depends on nand driver to define proper oob layout that excludes all ecc areas and nothing more. Support for very old 256 byte/page devices is not yet enabled/complete. For these devices, all ecc handling will be done inside this FTL due to wierd oob layout. Signed-off-by: Maxim Levitsky --- drivers/mtd/Kconfig | 12 + drivers/mtd/Makefile | 1 + drivers/mtd/sm_ftl.c | 1043 ++++++++++++++++++++++++++++++++++++++++++++++++++ drivers/mtd/sm_ftl.h | 75 ++++ 4 files changed, 1131 insertions(+), 0 deletions(-) create mode 100644 drivers/mtd/sm_ftl.c create mode 100644 drivers/mtd/sm_ftl.h diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig index ebeabd6..e13bf41 100644 --- a/drivers/mtd/Kconfig +++ b/drivers/mtd/Kconfig @@ -313,6 +313,18 @@ config SSFDC This enables read only access to SmartMedia formatted NAND flash. You can mount it with FAT file system. + +config SM_FTL + tristate "SmartMedia/xD new translation layer" + depends on EXPERIMENTAL + select MTD_SM_COMMON + help + This enables new and very EXPERMENTAL support for SmartMedia/xD + FTL (Flash tanslation layer) + Write support isn't yet well tested, therefore this code IS likely to + eat your card, so please don't use it together with valuable data. + Use readonly driver (CONFIG_SSFDC) instead. + config MTD_OOPS tristate "Log panic/oops to an MTD buffer" depends on MTD diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile index 02c5b17..02f6375 100644 --- a/drivers/mtd/Makefile +++ b/drivers/mtd/Makefile @@ -25,6 +25,7 @@ obj-$(CONFIG_NFTL) += nftl.o obj-$(CONFIG_INFTL) += inftl.o obj-$(CONFIG_RFD_FTL) += rfd_ftl.o obj-$(CONFIG_SSFDC) += ssfdc.o +obj-$(CONFIG_SM_FTL) += sm_ftl.o obj-$(CONFIG_MTD_OOPS) += mtdoops.o nftl-objs := nftlcore.o nftlmount.o diff --git a/drivers/mtd/sm_ftl.c b/drivers/mtd/sm_ftl.c new file mode 100644 index 0000000..b72c30b --- /dev/null +++ b/drivers/mtd/sm_ftl.c @@ -0,0 +1,1043 @@ +/* + * Copyright (C) 2009 - Maxim Levitsky + * SmartMedia/xD translation layer + * + * 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 +#include +#include +#include +#include +#include +#include +#include "sm_common.h" +#include "sm_ftl.h" + +static u8 tmp_buffer[SM_SECTOR_SIZE]; +static int cache_size = 5; + +module_param(cache_size, int, S_IRUGO); +MODULE_PARM_DESC(cache_size, + "Number of blocks to hold in the cache (5 default)"); + + +static void sm_erase_callback(struct erase_info *self); +static void sm_erase_block(struct sm_ftl *ftl, int zone_num, s16 block, + int put_free); +static void sm_mark_block_bad(struct sm_ftl *ftl, int zone_num, int block); +static int sm_cache_flush_thread(void *data); + + +static const struct chs_entry chs_table[] = { + { 1, 125, 4, 4 }, + { 2, 125, 4, 8 }, + { 4, 250, 4, 8 }, + { 8, 250, 4, 16 }, + { 16, 500, 4, 16 }, + { 32, 500, 8, 16 }, + { 64, 500, 8, 32 }, + { 128, 500, 16, 32 }, + { 256, 1000, 16, 32 }, + { 512, 1015, 32, 63 }, + { 1024, 985, 33, 63 }, + { 2048, 985, 33, 63 }, + { 0 }, +}; + +/* Find out media parameters. + * This ideally has to be based on nand id, but for now device size is enough */ +int sm_get_media_info(struct sm_ftl *ftl, struct mtd_info *mtd) +{ + int i; + int size_in_megs = mtd->size / (1024 * 1024); + ftl->readonly = mtd->type == MTD_ROM; + + /* Manual settings for very old devices */ + ftl->zone_count = 1; + ftl->smallpagenand = 0; + + switch (size_in_megs) { + case 1: + /* 1 Mb flas/rom SmartMedia card (256 byte pages)*/ + ftl->zone_size = 256; + ftl->max_lba = 250; + ftl->block_size = 8 * SM_SECTOR_SIZE; + ftl->smallpagenand = 1; + + break; + case 2: + /* 2 Mb flash SmartMedia (256 byte pages)*/ + if (!mtd->writesize == SM_SMALL_PAGE) { + ftl->zone_size = 512; + ftl->max_lba = 500; + ftl->block_size = 8 * SM_SECTOR_SIZE; + ftl->smallpagenand = 1; + /* 2 Mb rom SmartMedia */ + } else { + ftl->zone_size = 256; + ftl->max_lba = 250; + ftl->block_size = 16 * SM_SECTOR_SIZE; + } + break; + case 4: + /* 4 Mb flash/rom SmartMedia device */ + ftl->zone_size = 512; + ftl->max_lba = 500; + ftl->block_size = 16 * SM_SECTOR_SIZE; + break; + case 8: + /* 8 Mb flash/rom SmartMedia device */ + ftl->zone_size = 1024; + ftl->max_lba = 1000; + ftl->block_size = 16 * SM_SECTOR_SIZE; + } + + /* Minimum xD size is 16M, and thus all xD cards have standard zone + sizes. SmartMedia cards exist up to 128 Mb and have same layout*/ + if (size_in_megs >= 16) { + ftl->zone_count = size_in_megs / 16; + ftl->zone_size = 1024; + ftl->max_lba = 1000; + ftl->block_size = 32 * SM_SECTOR_SIZE; + } + + /* Test for proper write and erase sizes */ + if (mtd->erasesize > ftl->block_size) + return -ENODEV; + + if (mtd->writesize > SM_SECTOR_SIZE) + return -ENODEV; + + if (mtd->oobavail < sizeof(struct sm_oob)) + return -ENODEV; + + /* For now, don't support small page nand */ + if (ftl->smallpagenand) + return -ENODEV; + + /* This shouldn't happen */ + if (ftl->zone_count * ftl->zone_size * ftl->block_size != mtd->size) + return -ENODEV; + + /* Find geometry information */ + for (i = 0 ; i < ARRAY_SIZE(chs_table) ; i++) { + if (chs_table[i].size == size_in_megs) { + ftl->cylinders = chs_table[i].cyl; + ftl->heads = chs_table[i].head; + ftl->sectors = chs_table[i].sec; + return 0; + } + } + + ftl->cylinders = 985; + ftl->heads = 33; + ftl->sectors = 63; + return 0; +} + +/* Make offset from parts */ +static loff_t sm_mkoffset(struct sm_ftl *ftl, int zone, int block, int boffset) +{ + WARN_ON(boffset & (SM_SECTOR_SIZE - 1)); + WARN_ON(zone < 0 || zone >= ftl->zone_count); + WARN_ON(block >= ftl->zone_size); + WARN_ON(boffset > ftl->block_size); + + if (block == -1) + return -1; + + return (zone * SM_MAX_ZONE_SIZE + block) * ftl->block_size + boffset; +} + +/* Breaks offset into parts */ +static void sm_break_offset(struct sm_ftl *ftl, loff_t offset, + int *zone, int *block, int *boffset) +{ + *boffset = offset % ftl->block_size; + offset /= ftl->block_size; + *block = offset % ftl->max_lba; + offset /= ftl->max_lba; + + if (offset >= ftl->zone_count) + dbg("sm_break_offset: try to access a zone %lx", + (long unsigned int)offset); + + *zone = offset >= ftl->zone_count ? -1 : offset; +} + +/* Reads a sector + oob*/ +static int sm_read_sector(struct sm_ftl *ftl, + int zone, int block, int boffset, + u8 *buffer, struct sm_oob *oob) +{ + struct mtd_oob_ops ops; + struct sm_oob tmp_oob; + struct mtd_info *mtd = ftl->trans->mtd; + int ret; + loff_t offset; + + ops.len = SM_SECTOR_SIZE; + ops.datbuf = buffer; + + if (!oob) + oob = &tmp_oob; + + ops.mode = MTD_OOB_AUTO; + ops.ooboffs = 0; + ops.ooblen = sizeof(struct sm_oob); + ops.oobbuf = (void *)oob; + + /* FTL can contain -1 entries that are by default filled with bits */ + if (block == -1) { + + if (buffer) + memset(buffer, 0xFF, SM_SECTOR_SIZE); + memset(oob, 0xFF, sizeof(struct sm_oob)); + return 0; + } + + offset = sm_mkoffset(ftl, zone, block, boffset); + ret = mtd->read_oob(mtd, offset, &ops); + + if (ret) { + return -EIO; + dbg("read of sector at 0x%lx failed with error %d", + (long unsigned int)offset, ret); + } + + if (ops.oobretlen != sizeof(struct sm_oob)) { + dbg("read of sector at 0x%lx failed with wrong oob len %d", + (long unsigned int)offset, (int)ops.oobretlen); + return -EIO; + } + + if (buffer && sm_sector_valid(oob)) { + dbg("read of sector at 0x%lxfailed because " + "it is marked as invalid", + (long unsigned int)offset); + return -EIO; + } + + return 0; +} + +/* Write a block using data and lba */ +static int sm_write_block(struct sm_ftl *ftl, u8 *buf, + int zone_num, int block, int lba) +{ + struct mtd_oob_ops ops; + struct mtd_info *mtd = ftl->trans->mtd; + int boffset; + loff_t offset; + int retry; + + struct sm_oob oob; + memset(&oob, 0xFF, sizeof(oob)); + sm_write_lba(&oob, lba); + + if (zone_num == 0 && (block == ftl->cis_block || block == 0)) { + dbg("attempted to write the CIS!"); + return -EIO; + } + + + ops.len = SM_SECTOR_SIZE; + + ops.mode = MTD_OOB_AUTO; + ops.ooboffs = 0; + ops.ooblen = sizeof(struct sm_oob); + ops.oobbuf = (void *)&oob; + + /* Use write_oob here because some xD cards only accept writes that + contain both page and oob write. These cards most likely + do their own ftl */ + + offset = sm_mkoffset(ftl, zone_num, block, 0); + +restart: + for (boffset = 0; boffset < ftl->block_size; + boffset += SM_SECTOR_SIZE) { + + ops.datbuf = buf + boffset; + + if (!ftl->trans->mtd->write_oob(ftl->trans->mtd, + offset + boffset, &ops)) + continue; + + if (!retry) { + dbg("write of block %d in zone %d failed, erasing it", + block, zone_num); + + /* If write fails. try to erase the block */ + sm_erase_block(ftl, zone_num, block, 0); + retry = 1; + goto restart; + } else { + dbg("write of block %d in zone %d failed again" + ", marking as bad", block, zone_num); + + sm_mark_block_bad(ftl, zone_num, block); + return -EIO; + } + } + return 0; +} + +/* + * Erase a block within a zone + * If erase succedes, it updates free block fifo + */ +static void sm_erase_block(struct sm_ftl *ftl, int zone_num, s16 block, + int put_free) +{ + struct ftl_zone *zone = &ftl->zones[zone_num]; + struct erase_info erase; + struct mtd_info *mtd = ftl->trans->mtd; + + erase.mtd = ftl->trans->mtd; + erase.callback = sm_erase_callback; + erase.addr = sm_mkoffset(ftl, zone_num, block, 0); + erase.len = ftl->block_size; + erase.priv = (u_long)ftl; + + if (zone_num == 0 && (block == ftl->cis_block || block == 0)) { + dbg("attempted to erase the CIS!"); + return; + } + + if (ftl->trans->mtd->erase(ftl->trans->mtd, &erase)) { + dbg("erase of block %d in zone %d failed in mtd->erase call", + block, zone_num); + goto error; + } + + wait_for_completion(&ftl->erase_completion); + + if (ftl->erase_error) { + dbg("erase of block %d in zone %d failed after wait", + block, zone_num); + goto error; + } + + if (put_free) + kfifo_in(&zone->free_sectors, (const unsigned char *)&block, 2); + return; + +error: + sm_mark_block_bad(ftl, zone_num, block); + return; +} + +static void sm_erase_callback(struct erase_info *self) +{ + struct sm_ftl *ftl = (struct sm_ftl *)self->priv; + ftl->erase_error = (self->state == MTD_ERASE_FAILED); + complete(&ftl->erase_completion); +} + + +/* + * Throughtly test that block is valid and belongs + * to specified LBA. Tries to erase it if not + */ +static int sm_check_block_lba(struct sm_ftl *ftl, int zone, int block, int lba) +{ + int boffset; + struct sm_oob oob; + int tmp; + + for (boffset = 0; boffset < ftl->block_size; + boffset += SM_SECTOR_SIZE) { + + if (sm_read_sector(ftl, zone, block, boffset, tmp_buffer, + &oob)) { + dbg("block check: fail in sector %d in zone %d", + block, zone); + goto erase; + } + + if (sm_block_valid(&oob) || sm_sector_valid(&oob)) { + dbg("block check: block/sector status invalid" + " for sector %d in zone %d", + block, zone); + goto erase; + } + + tmp = sm_read_lba(&oob); + + if (tmp != lba) { + dbg("block check: block offset %d, we get " + "different LBA (%d), should get %d", + boffset, tmp, lba); + goto erase; + } + } + return 0; +erase: + sm_erase_block(ftl, zone, block, 1); + return -EIO; +} + +/* Mark whole block at offset 'offs' as bad. + */ +static void sm_mark_block_bad(struct sm_ftl *ftl, int zone_num, int block) +{ + struct mtd_oob_ops ops; + struct sm_oob oob; + int boffset; + int offset = sm_mkoffset(ftl, zone_num, block, 0); + struct mtd_info *mtd = ftl->trans->mtd; + + dbg("marking block %d of zone %d as bad", block, zone_num); + memset(&oob, 0xFF, sizeof(oob)); + oob.block_status = 0xF0; + + ops.mode = MTD_OOB_AUTO; + ops.ooboffs = 0; + ops.ooblen = sizeof(struct sm_oob); + ops.oobbuf = (void *)&oob; + ops.datbuf = NULL; + + /* We aren't checking the return value, because we don't care */ + for (boffset = 0; boffset < ftl->block_size; boffset += SM_SECTOR_SIZE) + mtd->write_oob(mtd, offset + boffset, &ops); +} + +/* Initialize FTL mapping for one zone */ +struct ftl_zone *sm_initialize_zone(struct sm_ftl *ftl, int zone_num) +{ + struct sm_oob oob; + struct ftl_zone *zone; + u16 block; + int lba; + int i = 0; + + BUG_ON(zone_num >= ftl->zone_count); + zone = &ftl->zones[zone_num]; + if (zone->initialized) + return zone; + + dbg("initializing zone %d", zone_num); + + zone->lba_to_phys_table = kmalloc(ftl->max_lba * 2, GFP_KERNEL); + + if (!zone->lba_to_phys_table) + return ERR_PTR(-ENOMEM); + + if (kfifo_alloc(&zone->free_sectors, ftl->zone_size * 2, GFP_KERNEL)) { + kfree(zone->lba_to_phys_table); + return ERR_PTR(-ENOMEM); + } + + memset(zone->lba_to_phys_table, -1, ftl->max_lba * 2); + + for (block = 0 ; block < ftl->zone_size ; block++) { + + /* Skip blocks till the CIS (including) */ + if (zone_num == 0 && block <= ftl->cis_block) { + + if (block != ftl->cis_block) + dbg("skipping block %d because" + " it is before the CIS (%d)", + block, ftl->cis_block); + continue; + } + + /* Not much that we can do with blocks without + * even readable oob... - skip*/ + /* Shouldn't happen though */ + if (sm_read_sector(ftl, zone_num, block, 0, NULL, &oob)) { + dbg("skipping block %d because it's " + "oob was unreadable", block); + continue; + } + + /* Blocks with 0xFFs in the oob area are assumed free - + add to free table*/ + lba = sm_read_lba(&oob); + if (lba == -1) { + kfifo_in(&zone->free_sectors, + (unsigned char *)&block, 2); + continue; + } + + /* Blocks that are marked as invalid aren't for sure usable */ + /* If such block has correct LBA and no other block has it, + return errors on read */ + if (sm_block_valid(&oob)) { + if (lba >= 0 && lba < ftl->max_lba) + zone->lba_to_phys_table[lba] = -2; + dbg("skipping block %d because it was marked bad", + block); + continue; + } + + /* Try to erase blocks that have invalid LBA, + but marked as valid */ + if (lba >= ftl->max_lba || lba == -2) { + dbg("erasing block %d because it has invalid LBA (%d)", + block, lba); + + sm_erase_block(ftl, zone_num, block, 1); + continue; + } + + /* If there is no collision, + just put the sector in the FTL table */ + if (zone->lba_to_phys_table[lba] < 0) { + /*dbg("LBA %04d -> PH %04d", lba, block);*/ + zone->lba_to_phys_table[lba] = block; + continue; + } + + dbg("collision of LBA %d between blocks %d and %d in zone %d", + lba, zone->lba_to_phys_table[lba], block, zone_num); + + /* Otherwise, carefully see if one of them is invalid*/ + if (sm_check_block_lba(ftl, zone_num, block, lba)) + continue; + + if (sm_check_block_lba(ftl, zone_num, + zone->lba_to_phys_table[lba], lba)) + continue; + + /* Now both blocks are valid and share same LBA... + I guess only solution is to throw a dice.... */ + dbg("erasing the later"); + sm_erase_block(ftl, zone_num, block, 1); + } + + dbg("zone initialized"); + zone->initialized = 1; + + /* No free sectors, means that the zone is heavily damaged, write won't + work, but it can still can be (partially) read */ + if (!kfifo_len(&zone->free_sectors)) { + dbg("no free blocks in zone %d", zone_num); + return zone; + } + + return zone; + + /* Randomize first block we write to */ + get_random_bytes(&i, 2); + i %= (kfifo_len(&zone->free_sectors) / 2); + + + while (i--) { + kfifo_out(&zone->free_sectors, (unsigned char *)&block, 2); + kfifo_in(&zone->free_sectors, (const unsigned char *)&block, 2); + } + return zone; +} + +/* Write one cached block to hardware */ +int sm_cache_block_write(struct sm_ftl *ftl, struct cached_block *cache_entry) +{ + struct ftl_zone *zone; + + int sector_num; + u16 write_sector; + int zone_num = cache_entry->zone; + int block_num; + + BUG_ON(cache_entry->zone < 0); + zone = &ftl->zones[cache_entry->zone]; + block_num = zone->lba_to_phys_table[cache_entry->lba]; + + + /* Read all unread areas of the cache block*/ + for_each_bit(sector_num, &cache_entry->data_invalid_bitmap, + ftl->block_size / SM_SECTOR_SIZE) { + + + if (sm_read_sector(ftl, + zone_num, block_num, sector_num * SM_SECTOR_SIZE, + cache_entry->data + sector_num * SM_SECTOR_SIZE, NULL)) + return -EIO; + } +restart: + /* No spare blocks */ + /* We could still continue by erasing the current block, + but for such worn out media it doesn't worth the trouble, + and the dangers */ + + if (!kfifo_len(&zone->free_sectors)) { + dbg("no free sectors for write!"); + return -EIO; + } + + kfifo_out(&zone->free_sectors, (unsigned char *)&write_sector, 2); + + if (sm_write_block(ftl, cache_entry->data, zone_num, write_sector, + cache_entry->lba)) + goto restart; + + /* Update the FTL table */ + zone->lba_to_phys_table[cache_entry->lba] = write_sector; + + /* Write succesfull, so erase and free the old block */ + if (block_num > 0) + sm_erase_block(ftl, zone_num, block_num, 1); + return 0; +} + +/* Initialize new/used cache entry */ +static int sm_cache_block_init(struct sm_ftl *ftl, + struct cached_block *cache_entry) +{ + if (!cache_entry->data) + cache_entry->data = kmalloc(ftl->block_size, GFP_KERNEL); + + if (!cache_entry->data) + return -ENOMEM; + + cache_entry->data_invalid_bitmap = 0xFFFFFFFF; + cache_entry->lba = -1; + cache_entry->zone = -1; + return 0; +} + +/* Flushes write cache, have to be run with ->cache_lock held */ +static int __sm_cache_flush(struct sm_ftl *ftl) +{ + struct cached_block *cache_entry = NULL, *tmp_entry; + struct mtd_info *mtd = ftl->trans->mtd; + int error; + + if (ftl->readonly) + return -EROFS; + + if (list_empty(&ftl->cache)) + return 0; + + list_for_each_entry_safe(cache_entry, tmp_entry, &ftl->cache, + list_member) { + /* Write should never fail, unless media is worn out */ + if (sm_cache_block_write(ftl, cache_entry)) { + dbg("sm_ftl: failed to write block %d at zone %d", + (int)cache_entry->lba, cache_entry->zone); + ftl->readonly = 1; + return -EIO; + } + + list_del(&cache_entry->list_member); + list_add(&cache_entry->list_member, &ftl->free_cache); + + error = sm_cache_block_init(ftl, cache_entry); + if (error) + return error; + } + return 0; +} + + +/* Flushes the write cache */ +static int sm_cache_flush(struct sm_ftl *ftl) +{ + int retval; + mutex_lock(&ftl->cache_mutex); + retval = __sm_cache_flush(ftl); + mutex_unlock(&ftl->cache_mutex); + return retval; +} + +/* Frees the write cache */ +static void sm_free_cache(struct sm_ftl *ftl) +{ + struct cached_block *cache_entry; + + mutex_lock(&ftl->cache_mutex); + while (!list_empty(&ftl->free_cache)) { + cache_entry = list_first_entry(&ftl->free_cache, + struct cached_block, list_member); + + kfree(cache_entry->data); + list_del(&cache_entry->list_member); + kfree(cache_entry); + } + mutex_unlock(&ftl->cache_mutex); +} + + +/* outside interface: open the device */ +static int sm_open(struct mtd_blktrans_dev *dev) +{ + struct sm_ftl *ftl = dev->priv; + ftl->flush_thread = kthread_run(sm_cache_flush_thread, + ftl, "smflush%d", dev->mtd->index); + + if (IS_ERR(ftl->flush_thread)) + return PTR_ERR(ftl->flush_thread); + return 0; +} + +/* outside interface: read a sector */ +static int sm_read(struct mtd_blktrans_dev *dev, + unsigned long sect_no, char *buf) +{ + struct sm_ftl *ftl = dev->priv; + struct ftl_zone *zone; + struct cached_block *cache_entry = NULL; + int error = 0; + int cache_found = 0; + + int zone_num, block, boffset; + + sm_break_offset(ftl, sect_no << 9, &zone_num, &block, &boffset); + + zone = sm_initialize_zone(ftl, zone_num); + if (IS_ERR(zone)) + return PTR_ERR(zone); + + mutex_lock(&ftl->cache_mutex); + + /* Have to look at cache first */ + list_for_each_entry(cache_entry, &ftl->cache, list_member) + if (cache_entry->zone == zone_num && + cache_entry->lba == block && + + !test_bit(boffset / SM_SECTOR_SIZE, + &cache_entry->data_invalid_bitmap)) { + + memcpy(buf, cache_entry->data + boffset, + SM_SECTOR_SIZE); + goto unlock; + } + + + /* Translate the block and return if doesn't exist in the table */ + block = zone->lba_to_phys_table[block]; + + if (block == -1) { + memset(buf, 0xFF, SM_SECTOR_SIZE); + goto unlock; + } + + if (block == -2) { + dbg("read block %d of zone %d marked invalid in the ftl", + block, zone_num); + error = -EIO; + goto unlock; + } + + /* Do the read. The below relies on proper ftl setup and underlying + driver to check at least the ecc + */ + if (sm_read_sector(ftl, zone_num, block, boffset, buf, NULL)) { + error = -EIO; + goto unlock; + } + + /* If we already have the cache entry, then add the data there, because + we will need it anyway..*/ + if (cache_found) { + memcpy(cache_entry->data + boffset, buf, SM_SECTOR_SIZE); + clear_bit(boffset / SM_SECTOR_SIZE, + &cache_entry->data_invalid_bitmap); + } +unlock: + mutex_unlock(&ftl->cache_mutex); + return error; +} + + +/* outside interface: write a sector */ +static int sm_write(struct mtd_blktrans_dev *dev, + unsigned long sec_no, char *buf) +{ + struct sm_ftl *ftl = dev->priv; + struct ftl_zone *zone; + struct cached_block *cache_entry = NULL; + int error; + int zone_num, block, boffset; + int cache_found = 0; + + if (ftl->readonly) + return -EROFS; + + /* Try to write the cache if possible */ + mutex_lock(&ftl->cache_mutex); + + sm_break_offset(ftl, sec_no << 9, &zone_num, &block, &boffset); + + zone = sm_initialize_zone(ftl, zone_num); + if (IS_ERR(zone)) + return PTR_ERR(zone); + + + /* Try to find existing cache entry */ + list_for_each_entry(cache_entry, &ftl->cache, list_member) + if (cache_entry->zone == zone_num && + cache_entry->lba == block) { + cache_found = 1; + break; + } + + /* Entry not in the cache, create new cache entry */ + if (!cache_found) { + + /* Flush the cache if full */ + if (list_empty(&ftl->free_cache)) { + + error = __sm_cache_flush(ftl); + + if (error) + goto unlock; + } + + BUG_ON(list_empty(&ftl->free_cache)); + + cache_entry = list_first_entry(&ftl->free_cache, + struct cached_block, list_member); + + cache_entry->lba = block; + cache_entry->zone = zone_num; + + list_del(&cache_entry->list_member); + list_add(&cache_entry->list_member, &ftl->cache); + } + + /* And finally put data there */ + memcpy(cache_entry->data + boffset, buf, SM_SECTOR_SIZE); + clear_bit(boffset / SM_SECTOR_SIZE, &cache_entry->data_invalid_bitmap); +unlock: + mutex_unlock(&ftl->cache_mutex); + return error; +} + +/* outside interface: flush everything */ +static int sm_flush(struct mtd_blktrans_dev *dev) +{ + struct sm_ftl *ftl = dev->priv; + return sm_cache_flush(ftl); +} + +/* outside interface: last user has quit using the device, + also called on removal */ +static int sm_release(struct mtd_blktrans_dev *dev) +{ + struct sm_ftl *ftl = dev->priv; + sm_cache_flush(ftl); + kthread_stop(ftl->flush_thread); + return 0; +} + +/* outside interface: get geometry */ +static int sm_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo) +{ + struct sm_ftl *ftl = dev->priv; + geo->heads = ftl->heads; + geo->sectors = ftl->sectors; + geo->cylinders = ftl->cylinders; + return 0; +} + + +/* Periodic cache flush thread */ +static int sm_cache_flush_thread(void *data) +{ + struct sm_ftl *ftl = (struct sm_ftl *)data; + + set_freezable(); + while (!kthread_should_stop()) { + + try_to_freeze(); + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(msecs_to_jiffies(500)); + sm_cache_flush(ftl); + } + + return 0; +} + +static const u8 cis_signature[] = { + 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20 +}; + +/* Locate the CIS */ +static int sm_find_cis(struct sm_ftl *ftl) +{ + int block, boffset; + struct sm_oob oob; + int block_found = 0; + + + /* Scan for first valid block */ + for (block = 0 ; block < ftl->zone_size - ftl->max_lba ; block++) { + if (sm_read_sector(ftl, 0, block, 0, NULL, &oob)) + continue; + + if (sm_block_valid(&oob)) + continue; + + block_found = 1; + break; + } + + if (!block_found) + return -EIO; + + /* Block might be still partially damaged, so scan for first valid + sector */ + for (boffset = 0 ; boffset < ftl->block_size; + boffset += SM_SECTOR_SIZE) { + + if (sm_read_sector(ftl, 0, block, boffset, tmp_buffer, &oob)) + continue; + + if (!memcmp(tmp_buffer, cis_signature, sizeof(cis_signature))) + goto found; + + if (!memcmp(tmp_buffer + SM_SECTOR_SIZE / 2, cis_signature, + sizeof(cis_signature))) + goto found; + return -EIO; + } +found: + ftl->cis_block = block; + dbg("CIS block found at offset %d", block * ftl->block_size + boffset); + return 0; +} + +/* external interface: main initialization function */ +static void sm_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) +{ + struct mtd_blktrans_dev *trans; + struct sm_ftl *ftl; + int i; + struct cached_block *cache_entry; + + + /* Allocate & initialize our private structure */ + ftl = kzalloc(sizeof(struct sm_ftl), GFP_KERNEL); + if (!ftl) + goto error1; + + INIT_LIST_HEAD(&ftl->cache); + INIT_LIST_HEAD(&ftl->free_cache); + mutex_init(&ftl->cache_mutex); + init_completion(&ftl->erase_completion); + + /* Read media information */ + if (sm_get_media_info(ftl, mtd)) + goto error2; + + /* Allocate zone array, it will be initialized on demand */ + ftl->zones = kzalloc(sizeof(struct ftl_zone) * ftl->zone_count, + GFP_KERNEL); + if (!ftl->zones) + goto error2; + + /* Allocate write cache */ + INIT_LIST_HEAD(&ftl->cache); + INIT_LIST_HEAD(&ftl->free_cache); + + for (i = 0 ; i < cache_size ; i++) { + cache_entry = kzalloc(sizeof(struct cached_block), + GFP_KERNEL); + if (!cache_entry) + break; + + if (sm_cache_block_init(ftl, cache_entry)) { + kfree(cache_entry); + break; + } + list_add(&cache_entry->list_member, &ftl->free_cache); + } + + if (list_empty(&ftl->free_cache)) + goto error3; + + /* Allocate upper layer structure and initialize it */ + trans = kzalloc(sizeof(struct mtd_blktrans_dev), GFP_KERNEL); + if (!trans) + goto error4; + + ftl->trans = trans; + trans->priv = ftl; + + trans->tr = tr; + trans->mtd = mtd; + trans->devnum = -1; + trans->size = (ftl->block_size * ftl->max_lba * ftl->zone_count) >> 9; + trans->readonly = ftl->readonly; + + if (sm_find_cis(ftl)) + goto error4; + + /* Register device*/ + if (add_mtd_blktrans_dev(trans)) + goto error5; + + dbg("Found %d MiB SmartMedia/xD card on %s", + (int)(mtd->size / (1024 * 1024)), mtd->name); + + dbg("FTL layout:"); + dbg("%d zones, each consists of %d blocks (+%d spares)", + ftl->zone_count, ftl->max_lba, + ftl->zone_size - ftl->max_lba); + dbg("each block consists of %d bytes", + ftl->block_size); + + return; +error5: + kfree(trans); +error4: + sm_free_cache(ftl); +error3: + kfree(ftl->zones); +error2: + kfree(ftl); +error1: + return; +} + +/* main interface: device {surprise,} removal */ +static void sm_remove_dev(struct mtd_blktrans_dev *dev) +{ + struct sm_ftl *ftl = dev->priv; + dbg("removing the ftl device"); + del_mtd_blktrans_dev(dev); + kfree(ftl->zones); + sm_free_cache(ftl); + kfree(ftl); /* WE free that here, but the ->release can still + be called after ..... fuck */ +} + +static struct mtd_blktrans_ops sm_ftl_ops = { + .name = "smblk", + .major = -1, + .part_bits = SM_FTL_PARTN_BITS, + .blksize = SM_SECTOR_SIZE, + .getgeo = sm_getgeo, + .readsect = sm_read, + .writesect = sm_write, + .add_mtd = sm_add_mtd, + .remove_dev = sm_remove_dev, + .open = sm_open, + .release = sm_release, + .flush = sm_flush, + .owner = THIS_MODULE, +}; + +static __init int sm_module_init(void) +{ + return register_mtd_blktrans(&sm_ftl_ops); +} + +static void __exit sm_module_exit(void) +{ + deregister_mtd_blktrans(&sm_ftl_ops); +} + +module_init(sm_module_init); +module_exit(sm_module_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Maxim Levitsky "); +MODULE_DESCRIPTION("Smartmedia/xD mtd translation layer"); diff --git a/drivers/mtd/sm_ftl.h b/drivers/mtd/sm_ftl.h new file mode 100644 index 0000000..d86d00e --- /dev/null +++ b/drivers/mtd/sm_ftl.h @@ -0,0 +1,75 @@ +/* + * Copyright (C) 2009 - Maxim Levitsky + * SmartMedia/xD translation layer + * + * Based loosly on ssfdc.c which is + * (c) 2005 Eptar srl + * Author: Claudio Lanconelli + * + * 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 +#include +#include +#include +#include +#include +#include + + +struct ftl_zone { + int initialized; + s16 *lba_to_phys_table; /* LBA to physical table */ + struct kfifo free_sectors; /* queue of free sectors */ +}; + +struct cached_block { + int zone; + unsigned long lba; + unsigned char *data; + long unsigned int data_invalid_bitmap; + struct list_head list_member; +}; + +struct sm_ftl { + struct mtd_blktrans_dev *trans; + struct ftl_zone *zones; + struct list_head cache; + struct list_head free_cache; + struct mutex cache_mutex; + struct completion erase_completion; + struct task_struct *flush_thread; + int erase_error; + + int block_size; /* block size in bytes */ + int zone_size; /* zone size in blocks */ + int zone_count; /* number of zones */ + int max_lba; /* maximum lba in a zone */ + int smallpagenand; /* 256 bytes/page nand */ + + int readonly; + + /* geometry stuff */ + int heads; + int sectors; + int cylinders; + + /*Misc */ + int cis_block; +}; + +struct chs_entry { + unsigned long size; + unsigned short cyl; + unsigned char head; + unsigned char sec; +}; + + +#define SM_FTL_PARTN_BITS 3 + +#define dbg(format, ...) \ + printk(KERN_ERR "sm_ftl" ": " format "\n", ## __VA_ARGS__) -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/