/* * drivers/mtd/nand/nand_util.c * * Copyright (C) 2006 by Weiss-Electronic GmbH. * All rights reserved. * * @author: Guido Classen * @descr: NAND Flash support * @references: borrowed heavily from Linux mtd-utils code: * flash_eraseall.c by Arcom Control System Ltd * nandwrite.c by Steven J. Hill (sjhill@realitydiluted.com) * and Thomas Gleixner (tglx@linutronix.de) * * See file CREDITS for list of people who contributed to this * project. * * 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. * * 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 * * Copyright 2010 Freescale Semiconductor * The portions of this file whose copyright is held by Freescale and which * are not considered a derived work of GPL v2-only code may be distributed * and/or modified 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. */ #include #include #include #include #include #include #include #include #include typedef struct erase_info erase_info_t; typedef struct mtd_info mtd_info_t; /* support only for native endian JFFS2 */ #define cpu_to_je16(x) (x) #define cpu_to_je32(x) (x) /*****************************************************************************/ static int nand_block_bad_scrub(struct mtd_info *mtd, loff_t ofs, int getchip) { return 0; } /** * nand_erase_opts: - erase NAND flash with support for various options * (jffs2 formating) * * @param meminfo NAND device to erase * @param opts options, @see struct nand_erase_options * @return 0 in case of success * * This code is ported from flash_eraseall.c from Linux mtd utils by * Arcom Control System Ltd. */ int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts) { struct jffs2_unknown_node cleanmarker; erase_info_t erase; unsigned long erase_length, erased_length; /* in blocks */ int bbtest = 1; int result; int percent_complete = -1; int (*nand_block_bad_old)(struct mtd_info *, loff_t, int) = NULL; const char *mtd_device = meminfo->name; struct mtd_oob_ops oob_opts; struct nand_chip *chip = meminfo->priv; if ((opts->offset & (meminfo->writesize - 1)) != 0) { printf("Attempt to erase non page aligned data\n"); return -1; } memset(&erase, 0, sizeof(erase)); memset(&oob_opts, 0, sizeof(oob_opts)); erase.mtd = meminfo; erase.len = meminfo->erasesize; erase.addr = opts->offset; erase_length = lldiv(opts->length + meminfo->erasesize - 1, meminfo->erasesize); cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK); cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER); cleanmarker.totlen = cpu_to_je32(8); /* scrub option allows to erase badblock. To prevent internal * check from erase() method, set block check method to dummy * and disable bad block table while erasing. */ if (opts->scrub) { struct nand_chip *priv_nand = meminfo->priv; nand_block_bad_old = priv_nand->block_bad; priv_nand->block_bad = nand_block_bad_scrub; /* we don't need the bad block table anymore... * after scrub, there are no bad blocks left! */ if (priv_nand->bbt) { kfree(priv_nand->bbt); } priv_nand->bbt = NULL; } for (erased_length = 0; erased_length < erase_length; erase.addr += meminfo->erasesize) { WATCHDOG_RESET (); if (!opts->scrub && bbtest) { int ret = meminfo->block_isbad(meminfo, erase.addr); if (ret > 0) { if (!opts->quiet) printf("\rSkipping bad block at " "0x%08llx " " \n", erase.addr); if (!opts->spread) erased_length++; continue; } else if (ret < 0) { printf("\n%s: MTD get bad block failed: %d\n", mtd_device, ret); return -1; } } erased_length++; result = meminfo->erase(meminfo, &erase); if (result != 0) { printf("\n%s: MTD Erase failure: %d\n", mtd_device, result); continue; } /* format for JFFS2 ? */ if (opts->jffs2 && chip->ecc.layout->oobavail >= 8) { chip->ops.ooblen = 8; chip->ops.datbuf = NULL; chip->ops.oobbuf = (uint8_t *)&cleanmarker; chip->ops.ooboffs = 0; chip->ops.mode = MTD_OOB_AUTO; result = meminfo->write_oob(meminfo, erase.addr, &chip->ops); if (result != 0) { printf("\n%s: MTD writeoob failure: %d\n", mtd_device, result); continue; } } if (!opts->quiet) { unsigned long long n = erased_length * 100ULL; int percent; do_div(n, erase_length); percent = (int)n; /* output progress message only at whole percent * steps to reduce the number of messages printed * on (slow) serial consoles */ if (percent != percent_complete) { percent_complete = percent; printf("\rErasing at 0x%llx -- %3d%% complete.", erase.addr, percent); if (opts->jffs2 && result == 0) printf(" Cleanmarker written at 0x%llx.", erase.addr); } } } if (!opts->quiet) printf("\n"); if (nand_block_bad_old) { struct nand_chip *priv_nand = meminfo->priv; priv_nand->block_bad = nand_block_bad_old; priv_nand->scan_bbt(meminfo); } return 0; } #ifdef CONFIG_CMD_NAND_LOCK_UNLOCK /****************************************************************************** * Support for locking / unlocking operations of some NAND devices *****************************************************************************/ #define NAND_CMD_LOCK 0x2a #define NAND_CMD_LOCK_TIGHT 0x2c #define NAND_CMD_UNLOCK1 0x23 #define NAND_CMD_UNLOCK2 0x24 #define NAND_CMD_LOCK_STATUS 0x7a /** * nand_lock: Set all pages of NAND flash chip to the LOCK or LOCK-TIGHT * state * * @param mtd nand mtd instance * @param tight bring device in lock tight mode * * @return 0 on success, -1 in case of error * * The lock / lock-tight command only applies to the whole chip. To get some * parts of the chip lock and others unlocked use the following sequence: * * - Lock all pages of the chip using nand_lock(mtd, 0) (or the lockpre pin) * - Call nand_unlock() once for each consecutive area to be unlocked * - If desired: Bring the chip to the lock-tight state using nand_lock(mtd, 1) * * If the device is in lock-tight state software can't change the * current active lock/unlock state of all pages. nand_lock() / nand_unlock() * calls will fail. It is only posible to leave lock-tight state by * an hardware signal (low pulse on _WP pin) or by power down. */ int nand_lock(struct mtd_info *mtd, int tight) { int ret = 0; int status; struct nand_chip *chip = mtd->priv; /* select the NAND device */ chip->select_chip(mtd, 0); chip->cmdfunc(mtd, (tight ? NAND_CMD_LOCK_TIGHT : NAND_CMD_LOCK), -1, -1); /* call wait ready function */ status = chip->waitfunc(mtd, chip); /* see if device thinks it succeeded */ if (status & 0x01) { ret = -1; } /* de-select the NAND device */ chip->select_chip(mtd, -1); return ret; } /** * nand_get_lock_status: - query current lock state from one page of NAND * flash * * @param mtd nand mtd instance * @param offset page address to query (muss be page aligned!) * * @return -1 in case of error * >0 lock status: * bitfield with the following combinations: * NAND_LOCK_STATUS_TIGHT: page in tight state * NAND_LOCK_STATUS_LOCK: page locked * NAND_LOCK_STATUS_UNLOCK: page unlocked * */ int nand_get_lock_status(struct mtd_info *mtd, loff_t offset) { int ret = 0; int chipnr; int page; struct nand_chip *chip = mtd->priv; /* select the NAND device */ chipnr = (int)(offset >> chip->chip_shift); chip->select_chip(mtd, chipnr); if ((offset & (mtd->writesize - 1)) != 0) { printf ("nand_get_lock_status: " "Start address must be beginning of " "nand page!\n"); ret = -1; goto out; } /* check the Lock Status */ page = (int)(offset >> chip->page_shift); chip->cmdfunc(mtd, NAND_CMD_LOCK_STATUS, -1, page & chip->pagemask); ret = chip->read_byte(mtd) & (NAND_LOCK_STATUS_TIGHT | NAND_LOCK_STATUS_LOCK | NAND_LOCK_STATUS_UNLOCK); out: /* de-select the NAND device */ chip->select_chip(mtd, -1); return ret; } /** * nand_unlock: - Unlock area of NAND pages * only one consecutive area can be unlocked at one time! * * @param mtd nand mtd instance * @param start start byte address * @param length number of bytes to unlock (must be a multiple of * page size nand->writesize) * * @return 0 on success, -1 in case of error */ int nand_unlock(struct mtd_info *mtd, ulong start, ulong length) { int ret = 0; int chipnr; int status; int page; struct nand_chip *chip = mtd->priv; printf ("nand_unlock: start: %08x, length: %d!\n", (int)start, (int)length); /* select the NAND device */ chipnr = (int)(start >> chip->chip_shift); chip->select_chip(mtd, chipnr); /* check the WP bit */ chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1); if (!(chip->read_byte(mtd) & NAND_STATUS_WP)) { printf ("nand_unlock: Device is write protected!\n"); ret = -1; goto out; } if ((start & (mtd->erasesize - 1)) != 0) { printf ("nand_unlock: Start address must be beginning of " "nand block!\n"); ret = -1; goto out; } if (length == 0 || (length & (mtd->erasesize - 1)) != 0) { printf ("nand_unlock: Length must be a multiple of nand block " "size %08x!\n", mtd->erasesize); ret = -1; goto out; } /* * Set length so that the last address is set to the * starting address of the last block */ length -= mtd->erasesize; /* submit address of first page to unlock */ page = (int)(start >> chip->page_shift); chip->cmdfunc(mtd, NAND_CMD_UNLOCK1, -1, page & chip->pagemask); /* submit ADDRESS of LAST page to unlock */ page += (int)(length >> chip->page_shift); chip->cmdfunc(mtd, NAND_CMD_UNLOCK2, -1, page & chip->pagemask); /* call wait ready function */ status = chip->waitfunc(mtd, chip); /* see if device thinks it succeeded */ if (status & 0x01) { /* there was an error */ ret = -1; goto out; } out: /* de-select the NAND device */ chip->select_chip(mtd, -1); return ret; } #endif /** * check_skip_len * * Check if there are any bad blocks, and whether length including bad * blocks fits into device * * @param nand NAND device * @param offset offset in flash * @param length image length * @return 0 if the image fits and there are no bad blocks * 1 if the image fits, but there are bad blocks * -1 if the image does not fit */ static int check_skip_len(nand_info_t *nand, loff_t offset, size_t length) { size_t len_excl_bad = 0; int ret = 0; while (len_excl_bad < length) { size_t block_len, block_off; loff_t block_start; if (offset >= nand->size) return -1; block_start = offset & ~(loff_t)(nand->erasesize - 1); block_off = offset & (nand->erasesize - 1); block_len = nand->erasesize - block_off; if (!nand_block_isbad(nand, block_start)) len_excl_bad += block_len; else ret = 1; offset += block_len; } return ret; } /** * nand_write_skip_bad: * * Write image to NAND flash. * Blocks that are marked bad are skipped and the is written to the next * block instead as long as the image is short enough to fit even after * skipping the bad blocks. * * @param nand NAND device * @param offset offset in flash * @param length buffer length * @param buf buffer to read from * @return 0 in case of success */ int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length, u_char *buffer) { int rval; size_t left_to_write = *length; u_char *p_buffer = buffer; int need_skip; /* * nand_write() handles unaligned, partial page writes. * * We allow length to be unaligned, for convenience in * using the $filesize variable. * * However, starting at an unaligned offset makes the * semantics of bad block skipping ambiguous (really, * you should only start a block skipping access at a * partition boundary). So don't try to handle that. */ if ((offset & (nand->writesize - 1)) != 0) { printf ("Attempt to write non page aligned data\n"); *length = 0; return -EINVAL; } need_skip = check_skip_len(nand, offset, *length); if (need_skip < 0) { printf ("Attempt to write outside the flash area\n"); *length = 0; return -EINVAL; } if (!need_skip) { rval = nand_write (nand, offset, length, buffer); if (rval == 0) return 0; *length = 0; printf ("NAND write to offset %llx failed %d\n", offset, rval); return rval; } while (left_to_write > 0) { size_t block_offset = offset & (nand->erasesize - 1); size_t write_size; WATCHDOG_RESET (); if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) { printf ("Skip bad block 0x%08llx\n", offset & ~(nand->erasesize - 1)); offset += nand->erasesize - block_offset; continue; } if (left_to_write < (nand->erasesize - block_offset)) write_size = left_to_write; else write_size = nand->erasesize - block_offset; rval = nand_write (nand, offset, &write_size, p_buffer); if (rval != 0) { printf ("NAND write to offset %llx failed %d\n", offset, rval); *length -= left_to_write; return rval; } left_to_write -= write_size; offset += write_size; p_buffer += write_size; } return 0; } /** * nand_read_skip_bad: * * Read image from NAND flash. * Blocks that are marked bad are skipped and the next block is readen * instead as long as the image is short enough to fit even after skipping the * bad blocks. * * @param nand NAND device * @param offset offset in flash * @param length buffer length, on return holds remaining bytes to read * @param buffer buffer to write to * @return 0 in case of success */ int nand_read_skip_bad(nand_info_t *nand, loff_t offset, size_t *length, u_char *buffer) { int rval; size_t left_to_read = *length; u_char *p_buffer = buffer; int need_skip; if ((offset & (nand->writesize - 1)) != 0) { printf ("Attempt to read non page aligned data\n"); *length = 0; return -EINVAL; } need_skip = check_skip_len(nand, offset, *length); if (need_skip < 0) { printf ("Attempt to read outside the flash area\n"); *length = 0; return -EINVAL; } if (!need_skip) { rval = nand_read (nand, offset, length, buffer); if (!rval || rval == -EUCLEAN) return 0; *length = 0; printf ("NAND read from offset %llx failed %d\n", offset, rval); return rval; } while (left_to_read > 0) { size_t block_offset = offset & (nand->erasesize - 1); size_t read_length; WATCHDOG_RESET (); if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) { printf ("Skipping bad block 0x%08llx\n", offset & ~(nand->erasesize - 1)); offset += nand->erasesize - block_offset; continue; } if (left_to_read < (nand->erasesize - block_offset)) read_length = left_to_read; else read_length = nand->erasesize - block_offset; rval = nand_read (nand, offset, &read_length, p_buffer); if (rval && rval != -EUCLEAN) { printf ("NAND read from offset %llx failed %d\n", offset, rval); *length -= left_to_read; return rval; } left_to_read -= read_length; offset += read_length; p_buffer += read_length; } return 0; }