diff options
Diffstat (limited to 'drivers/mtd/nand/nand_imx_bbm.c')
| -rw-r--r-- | drivers/mtd/nand/nand_imx_bbm.c | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/drivers/mtd/nand/nand_imx_bbm.c b/drivers/mtd/nand/nand_imx_bbm.c deleted file mode 100644 index c005482b06..0000000000 --- a/drivers/mtd/nand/nand_imx_bbm.c +++ /dev/null @@ -1,219 +0,0 @@ -/* - * imx_nand_bbm.c - create a flash bad block table for i.MX NAND - * - * Copyright (c) 2013 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix - * - * 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. - */ - -#include <common.h> -#include <command.h> -#include <fs.h> -#include <errno.h> -#include <getopt.h> -#include <fcntl.h> -#include <malloc.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/nand.h> -#include <linux/err.h> - -/* - * The i.MX NAND controller has the problem that it handles the - * data in chunks of 512 bytes. It doesn't treat 2k NAND chips as - * 2048 byte data + 64 OOB, but instead: - * - * 512b data + 16b OOB + - * 512b data + 16b OOB + - * 512b data + 16b OOB + - * 512b data + 16b OOB - * - * This means that the factory provided bad block marker ends up - * in the page data at offset 2000 instead of in the OOB data. - * - * To preserve the factory bad block information we take the following - * strategy: - * - * - If the NAND driver detects that no flash BBT is present on 2k NAND - * chips it will not create one because it would do so based on the wrong - * BBM position - * - This command is used to create a flash BBT then. - * - * From this point on we can forget about the BBMs and rely completely - * on the flash BBT. - * - */ -static int checkbad(struct mtd_info *mtd, loff_t ofs) -{ - int ret; - uint8_t buf[mtd->writesize + mtd->oobsize]; - struct mtd_oob_ops ops; - - ops.mode = MTD_OPS_RAW; - ops.ooboffs = 0; - ops.datbuf = buf; - ops.len = mtd->writesize; - ops.oobbuf = buf + mtd->writesize; - ops.ooblen = mtd->oobsize; - - ret = mtd_read_oob(mtd, ofs, &ops); - if (ret < 0) - return ret; - - if (buf[2000] != 0xff) - return 1; - - return 0; -} - -static void *create_bbt(struct mtd_info *mtd) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - int len, i, numblocks, ret; - loff_t from = 0; - uint8_t *bbt; - - if ((chip->bbt_td && chip->bbt_td->pages[0] != -1) || - (chip->bbt_md && chip->bbt_md->pages[0] != -1)) { - printf("Flash bbt already present\n"); - return ERR_PTR(-EEXIST); - } - - len = mtd->size >> (chip->bbt_erase_shift + 2); - - /* Allocate memory (2bit per block) and clear the memory bad block table */ - bbt = kzalloc(len, GFP_KERNEL); - if (!bbt) - return ERR_PTR(-ENOMEM); - - numblocks = mtd->size >> (chip->bbt_erase_shift - 1); - - for (i = 0; i < numblocks;) { - ret = checkbad(mtd, from); - if (ret < 0) - goto out; - - if (ret) { - bbt[i >> 3] |= 0x03 << (i & 0x6); - printf("Bad eraseblock %d at 0x%08x\n", i >> 1, - (unsigned int)from); - } - - i += 2; - from += (1 << chip->bbt_erase_shift); - } - - return bbt; - -out: - free(bbt); - - return ERR_PTR(ret); -} - -static int attach_bbt(struct mtd_info *mtd, void *bbt) -{ - struct nand_chip *chip = mtd_to_nand(mtd); - - chip->bbt_td->options |= NAND_BBT_WRITE | NAND_BBT_CREATE; - chip->bbt_md->options |= NAND_BBT_WRITE | NAND_BBT_CREATE; - free(chip->bbt); - chip->bbt = bbt; - - return nand_update_bbt(mtd, 0); -} - -static int do_imx_nand_bbm(int argc, char *argv[]) -{ - int opt, ret; - struct cdev *cdev; - struct mtd_info *mtd; - int yes = 0; - void *bbt; - - while ((opt = getopt(argc, argv, "y")) > 0) { - switch (opt) { - case 'y': - yes = 1; - break; - default: - return COMMAND_ERROR_USAGE; - } - } - - cdev = cdev_open("nand0", O_RDWR); - if (!cdev) - return -ENOENT; - - mtd = cdev->mtd; - if (!mtd) - return -EINVAL; - - if (strcmp(mtd->name, "imx_nand")) { - printf("This is not an i.MX nand but a %s\n", mtd->name); - ret = -EINVAL; - goto out; - } - - switch (mtd->writesize) { - case 512: - printf("writesize is 512. This command is not needed\n"); - ret = 1; - goto out; - case 2048: - break; - default: - printf("not implemented for writesize %d\n", mtd->writesize); - ret = 1; - goto out; - } - - bbt = create_bbt(mtd); - if (IS_ERR(bbt)) { - ret = 1; - goto out; - } - - if (!yes) { - int c; - - printf("create flash bbt (y/n)?"); - c = getchar(); - if (c == 'y') - yes = 1; - printf("\n"); - } - - if (!yes) { - free(bbt); - ret = 1; - - goto out; - } - - ret = attach_bbt(mtd, bbt); - if (!ret) - printf("bbt successfully added\n"); - else - free(bbt); - -out: - cdev_close(cdev); - - return ret; -} - -BAREBOX_CMD_START(imx_nand_bbm) - .cmd = do_imx_nand_bbm, - BAREBOX_CMD_DESC("create BBT for i.MX NAND") - BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP) -BAREBOX_CMD_END |