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d09807ad14
As reported by patch [1], the `mtd erase' command should not erase bad blocks. To force bad block erasing you have to use the `mtd erase.dontskipbad' command. This patch tries to fix the same issue without modifying code taken from the linux kernel, in order to make further upgrades easier. [1] https://lore.kernel.org/all/20221006031501.110290-2-mikhail.kshevetskiy@iopsys.eu/ Suggested-by: Michael Trimarchi <michael@amarulasolutions.com> Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com> Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com> Co-developed-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu> Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu> Tested-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
580 lines
13 KiB
C
580 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* mtd.c
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*
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* Generic command to handle basic operations on any memory device.
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*
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* Copyright: Bootlin, 2018
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* Author: Miquèl Raynal <miquel.raynal@bootlin.com>
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*/
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#include <command.h>
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#include <common.h>
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#include <console.h>
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#include <malloc.h>
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#include <mapmem.h>
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#include <mtd.h>
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#include <dm/devres.h>
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#include <linux/err.h>
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#include <linux/ctype.h>
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static struct mtd_info *get_mtd_by_name(const char *name)
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{
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struct mtd_info *mtd;
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mtd_probe_devices();
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mtd = get_mtd_device_nm(name);
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if (IS_ERR_OR_NULL(mtd))
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printf("MTD device %s not found, ret %ld\n", name,
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PTR_ERR(mtd));
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return mtd;
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}
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static uint mtd_len_to_pages(struct mtd_info *mtd, u64 len)
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{
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do_div(len, mtd->writesize);
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return len;
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}
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static bool mtd_is_aligned_with_min_io_size(struct mtd_info *mtd, u64 size)
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{
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return !do_div(size, mtd->writesize);
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}
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static bool mtd_is_aligned_with_block_size(struct mtd_info *mtd, u64 size)
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{
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return !do_div(size, mtd->erasesize);
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}
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static void mtd_dump_buf(const u8 *buf, uint len, uint offset)
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{
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int i, j;
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for (i = 0; i < len; ) {
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printf("0x%08x:\t", offset + i);
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for (j = 0; j < 8; j++)
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printf("%02x ", buf[i + j]);
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printf(" ");
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i += 8;
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for (j = 0; j < 8; j++)
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printf("%02x ", buf[i + j]);
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printf("\n");
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i += 8;
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}
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}
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static void mtd_dump_device_buf(struct mtd_info *mtd, u64 start_off,
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const u8 *buf, u64 len, bool woob)
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{
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bool has_pages = mtd->type == MTD_NANDFLASH ||
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mtd->type == MTD_MLCNANDFLASH;
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int npages = mtd_len_to_pages(mtd, len);
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uint page;
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if (has_pages) {
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for (page = 0; page < npages; page++) {
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u64 data_off = page * mtd->writesize;
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printf("\nDump %d data bytes from 0x%08llx:\n",
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mtd->writesize, start_off + data_off);
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mtd_dump_buf(&buf[data_off],
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mtd->writesize, start_off + data_off);
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if (woob) {
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u64 oob_off = page * mtd->oobsize;
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printf("Dump %d OOB bytes from page at 0x%08llx:\n",
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mtd->oobsize, start_off + data_off);
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mtd_dump_buf(&buf[len + oob_off],
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mtd->oobsize, 0);
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}
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}
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} else {
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printf("\nDump %lld data bytes from 0x%llx:\n",
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len, start_off);
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mtd_dump_buf(buf, len, start_off);
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}
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}
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static void mtd_show_parts(struct mtd_info *mtd, int level)
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{
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struct mtd_info *part;
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int i;
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list_for_each_entry(part, &mtd->partitions, node) {
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for (i = 0; i < level; i++)
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printf("\t");
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printf(" - 0x%012llx-0x%012llx : \"%s\"\n",
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part->offset, part->offset + part->size, part->name);
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mtd_show_parts(part, level + 1);
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}
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}
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static void mtd_show_device(struct mtd_info *mtd)
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{
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/* Device */
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printf("* %s\n", mtd->name);
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#if defined(CONFIG_DM)
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if (mtd->dev) {
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printf(" - device: %s\n", mtd->dev->name);
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printf(" - parent: %s\n", mtd->dev->parent->name);
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printf(" - driver: %s\n", mtd->dev->driver->name);
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}
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#endif
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if (IS_ENABLED(CONFIG_OF_CONTROL) && mtd->dev) {
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char buf[256];
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int res;
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res = ofnode_get_path(mtd_get_ofnode(mtd), buf, 256);
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printf(" - path: %s\n", res == 0 ? buf : "unavailable");
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}
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/* MTD device information */
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printf(" - type: ");
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switch (mtd->type) {
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case MTD_RAM:
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printf("RAM\n");
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break;
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case MTD_ROM:
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printf("ROM\n");
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break;
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case MTD_NORFLASH:
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printf("NOR flash\n");
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break;
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case MTD_NANDFLASH:
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printf("NAND flash\n");
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break;
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case MTD_DATAFLASH:
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printf("Data flash\n");
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break;
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case MTD_UBIVOLUME:
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printf("UBI volume\n");
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break;
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case MTD_MLCNANDFLASH:
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printf("MLC NAND flash\n");
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break;
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case MTD_ABSENT:
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default:
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printf("Unknown\n");
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break;
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}
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printf(" - block size: 0x%x bytes\n", mtd->erasesize);
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printf(" - min I/O: 0x%x bytes\n", mtd->writesize);
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if (mtd->oobsize) {
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printf(" - OOB size: %u bytes\n", mtd->oobsize);
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printf(" - OOB available: %u bytes\n", mtd->oobavail);
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}
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if (mtd->ecc_strength) {
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printf(" - ECC strength: %u bits\n", mtd->ecc_strength);
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printf(" - ECC step size: %u bytes\n", mtd->ecc_step_size);
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printf(" - bitflip threshold: %u bits\n",
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mtd->bitflip_threshold);
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}
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printf(" - 0x%012llx-0x%012llx : \"%s\"\n",
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mtd->offset, mtd->offset + mtd->size, mtd->name);
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/* MTD partitions, if any */
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mtd_show_parts(mtd, 1);
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}
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/* Logic taken from fs/ubifs/recovery.c:is_empty() */
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static bool mtd_oob_write_is_empty(struct mtd_oob_ops *op)
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{
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int i;
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for (i = 0; i < op->len; i++)
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if (op->datbuf[i] != 0xff)
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return false;
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for (i = 0; i < op->ooblen; i++)
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if (op->oobbuf[i] != 0xff)
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return false;
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return true;
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}
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static int do_mtd_list(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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struct mtd_info *mtd;
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int dev_nb = 0;
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/* Ensure all devices (and their partitions) are probed */
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mtd_probe_devices();
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printf("List of MTD devices:\n");
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mtd_for_each_device(mtd) {
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if (!mtd_is_partition(mtd))
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mtd_show_device(mtd);
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dev_nb++;
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}
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if (!dev_nb) {
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printf("No MTD device found\n");
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return CMD_RET_FAILURE;
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}
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return CMD_RET_SUCCESS;
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}
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static int mtd_special_write_oob(struct mtd_info *mtd, u64 off,
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struct mtd_oob_ops *io_op,
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bool write_empty_pages, bool woob)
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{
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int ret = 0;
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/*
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* By default, do not write an empty page.
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* Skip it by simulating a successful write.
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*/
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if (!write_empty_pages && mtd_oob_write_is_empty(io_op)) {
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io_op->retlen = mtd->writesize;
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io_op->oobretlen = woob ? mtd->oobsize : 0;
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} else {
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ret = mtd_write_oob(mtd, off, io_op);
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}
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return ret;
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}
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static int do_mtd_io(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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bool dump, read, raw, woob, write_empty_pages, has_pages = false;
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u64 start_off, off, len, remaining, default_len;
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struct mtd_oob_ops io_op = {};
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uint user_addr = 0, npages;
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const char *cmd = argv[0];
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struct mtd_info *mtd;
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u32 oob_len;
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u8 *buf;
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int ret;
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if (argc < 2)
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return CMD_RET_USAGE;
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mtd = get_mtd_by_name(argv[1]);
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if (IS_ERR_OR_NULL(mtd))
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return CMD_RET_FAILURE;
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if (mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH)
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has_pages = true;
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dump = !strncmp(cmd, "dump", 4);
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read = dump || !strncmp(cmd, "read", 4);
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raw = strstr(cmd, ".raw");
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woob = strstr(cmd, ".oob");
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write_empty_pages = !has_pages || strstr(cmd, ".dontskipff");
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argc -= 2;
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argv += 2;
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if (!dump) {
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if (!argc) {
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ret = CMD_RET_USAGE;
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goto out_put_mtd;
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}
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user_addr = hextoul(argv[0], NULL);
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argc--;
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argv++;
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}
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start_off = argc > 0 ? hextoul(argv[0], NULL) : 0;
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if (!mtd_is_aligned_with_min_io_size(mtd, start_off)) {
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printf("Offset not aligned with a page (0x%x)\n",
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mtd->writesize);
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ret = CMD_RET_FAILURE;
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goto out_put_mtd;
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}
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default_len = dump ? mtd->writesize : mtd->size;
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len = argc > 1 ? hextoul(argv[1], NULL) : default_len;
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if (!mtd_is_aligned_with_min_io_size(mtd, len)) {
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len = round_up(len, mtd->writesize);
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printf("Size not on a page boundary (0x%x), rounding to 0x%llx\n",
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mtd->writesize, len);
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}
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remaining = len;
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npages = mtd_len_to_pages(mtd, len);
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oob_len = woob ? npages * mtd->oobsize : 0;
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if (dump)
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buf = kmalloc(len + oob_len, GFP_KERNEL);
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else
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buf = map_sysmem(user_addr, 0);
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if (!buf) {
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printf("Could not map/allocate the user buffer\n");
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ret = CMD_RET_FAILURE;
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goto out_put_mtd;
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}
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if (has_pages)
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printf("%s %lld byte(s) (%d page(s)) at offset 0x%08llx%s%s%s\n",
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read ? "Reading" : "Writing", len, npages, start_off,
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raw ? " [raw]" : "", woob ? " [oob]" : "",
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!read && write_empty_pages ? " [dontskipff]" : "");
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else
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printf("%s %lld byte(s) at offset 0x%08llx\n",
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read ? "Reading" : "Writing", len, start_off);
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io_op.mode = raw ? MTD_OPS_RAW : MTD_OPS_AUTO_OOB;
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io_op.len = has_pages ? mtd->writesize : len;
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io_op.ooblen = woob ? mtd->oobsize : 0;
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io_op.datbuf = buf;
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io_op.oobbuf = woob ? &buf[len] : NULL;
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/* Search for the first good block after the given offset */
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off = start_off;
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while (mtd_block_isbad(mtd, off))
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off += mtd->erasesize;
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/* Loop over the pages to do the actual read/write */
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while (remaining) {
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/* Skip the block if it is bad */
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if (mtd_is_aligned_with_block_size(mtd, off) &&
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mtd_block_isbad(mtd, off)) {
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off += mtd->erasesize;
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continue;
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}
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if (read)
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ret = mtd_read_oob(mtd, off, &io_op);
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else
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ret = mtd_special_write_oob(mtd, off, &io_op,
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write_empty_pages, woob);
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if (ret) {
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printf("Failure while %s at offset 0x%llx\n",
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read ? "reading" : "writing", off);
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break;
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}
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off += io_op.retlen;
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remaining -= io_op.retlen;
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io_op.datbuf += io_op.retlen;
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io_op.oobbuf += io_op.oobretlen;
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}
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if (!ret && dump)
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mtd_dump_device_buf(mtd, start_off, buf, len, woob);
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if (dump)
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kfree(buf);
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else
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unmap_sysmem(buf);
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if (ret) {
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printf("%s on %s failed with error %d\n",
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read ? "Read" : "Write", mtd->name, ret);
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ret = CMD_RET_FAILURE;
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} else {
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ret = CMD_RET_SUCCESS;
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}
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out_put_mtd:
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put_mtd_device(mtd);
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return ret;
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}
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static int do_mtd_erase(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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struct erase_info erase_op = {};
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struct mtd_info *mtd;
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u64 off, len;
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bool scrub;
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int ret = 0;
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if (argc < 2)
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return CMD_RET_USAGE;
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mtd = get_mtd_by_name(argv[1]);
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if (IS_ERR_OR_NULL(mtd))
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return CMD_RET_FAILURE;
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scrub = strstr(argv[0], ".dontskipbad");
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argc -= 2;
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argv += 2;
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off = argc > 0 ? hextoul(argv[0], NULL) : 0;
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len = argc > 1 ? hextoul(argv[1], NULL) : mtd->size;
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if (!mtd_is_aligned_with_block_size(mtd, off)) {
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printf("Offset not aligned with a block (0x%x)\n",
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mtd->erasesize);
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ret = CMD_RET_FAILURE;
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goto out_put_mtd;
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}
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if (!mtd_is_aligned_with_block_size(mtd, len)) {
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printf("Size not a multiple of a block (0x%x)\n",
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mtd->erasesize);
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ret = CMD_RET_FAILURE;
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goto out_put_mtd;
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}
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printf("Erasing 0x%08llx ... 0x%08llx (%d eraseblock(s))\n",
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off, off + len - 1, mtd_div_by_eb(len, mtd));
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erase_op.mtd = mtd;
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erase_op.addr = off;
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erase_op.len = mtd->erasesize;
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while (len) {
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if (!scrub) {
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ret = mtd_block_isbad(mtd, erase_op.addr);
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if (ret < 0) {
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printf("Failed to get bad block at 0x%08llx\n",
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erase_op.addr);
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ret = CMD_RET_FAILURE;
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goto out_put_mtd;
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}
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if (ret > 0) {
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printf("Skipping bad block at 0x%08llx\n",
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erase_op.addr);
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ret = 0;
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len -= mtd->erasesize;
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erase_op.addr += mtd->erasesize;
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continue;
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}
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}
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ret = mtd_erase(mtd, &erase_op);
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if (ret && ret != -EIO)
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break;
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len -= mtd->erasesize;
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erase_op.addr += mtd->erasesize;
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}
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if (ret && ret != -EIO)
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ret = CMD_RET_FAILURE;
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else
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ret = CMD_RET_SUCCESS;
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out_put_mtd:
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put_mtd_device(mtd);
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return ret;
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}
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static int do_mtd_bad(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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struct mtd_info *mtd;
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loff_t off;
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if (argc < 2)
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return CMD_RET_USAGE;
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mtd = get_mtd_by_name(argv[1]);
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if (IS_ERR_OR_NULL(mtd))
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return CMD_RET_FAILURE;
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if (!mtd_can_have_bb(mtd)) {
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printf("Only NAND-based devices can have bad blocks\n");
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goto out_put_mtd;
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}
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printf("MTD device %s bad blocks list:\n", mtd->name);
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for (off = 0; off < mtd->size; off += mtd->erasesize) {
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if (mtd_block_isbad(mtd, off))
|
|
printf("\t0x%08llx\n", off);
|
|
}
|
|
|
|
out_put_mtd:
|
|
put_mtd_device(mtd);
|
|
|
|
return CMD_RET_SUCCESS;
|
|
}
|
|
|
|
#ifdef CONFIG_AUTO_COMPLETE
|
|
static int mtd_name_complete(int argc, char *const argv[], char last_char,
|
|
int maxv, char *cmdv[])
|
|
{
|
|
int len = 0, n_found = 0;
|
|
struct mtd_info *mtd;
|
|
|
|
argc--;
|
|
argv++;
|
|
|
|
if (argc > 1 ||
|
|
(argc == 1 && (last_char == '\0' || isblank(last_char))))
|
|
return 0;
|
|
|
|
if (argc)
|
|
len = strlen(argv[0]);
|
|
|
|
mtd_for_each_device(mtd) {
|
|
if (argc &&
|
|
(len > strlen(mtd->name) ||
|
|
strncmp(argv[0], mtd->name, len)))
|
|
continue;
|
|
|
|
if (n_found >= maxv - 2) {
|
|
cmdv[n_found++] = "...";
|
|
break;
|
|
}
|
|
|
|
cmdv[n_found++] = mtd->name;
|
|
}
|
|
|
|
cmdv[n_found] = NULL;
|
|
|
|
return n_found;
|
|
}
|
|
#endif /* CONFIG_AUTO_COMPLETE */
|
|
|
|
#ifdef CONFIG_SYS_LONGHELP
|
|
static char mtd_help_text[] =
|
|
"- generic operations on memory technology devices\n\n"
|
|
"mtd list\n"
|
|
"mtd read[.raw][.oob] <name> <addr> [<off> [<size>]]\n"
|
|
"mtd dump[.raw][.oob] <name> [<off> [<size>]]\n"
|
|
"mtd write[.raw][.oob][.dontskipff] <name> <addr> [<off> [<size>]]\n"
|
|
"mtd erase[.dontskipbad] <name> [<off> [<size>]]\n"
|
|
"\n"
|
|
"Specific functions:\n"
|
|
"mtd bad <name>\n"
|
|
"\n"
|
|
"With:\n"
|
|
"\t<name>: NAND partition/chip name (or corresponding DM device name or OF path)\n"
|
|
"\t<addr>: user address from/to which data will be retrieved/stored\n"
|
|
"\t<off>: offset in <name> in bytes (default: start of the part)\n"
|
|
"\t\t* must be block-aligned for erase\n"
|
|
"\t\t* must be page-aligned otherwise\n"
|
|
"\t<size>: length of the operation in bytes (default: the entire device)\n"
|
|
"\t\t* must be a multiple of a block for erase\n"
|
|
"\t\t* must be a multiple of a page otherwise (special case: default is a page with dump)\n"
|
|
"\n"
|
|
"The .dontskipff option forces writing empty pages, don't use it if unsure.\n";
|
|
#endif
|
|
|
|
U_BOOT_CMD_WITH_SUBCMDS(mtd, "MTD utils", mtd_help_text,
|
|
U_BOOT_SUBCMD_MKENT(list, 1, 1, do_mtd_list),
|
|
U_BOOT_SUBCMD_MKENT_COMPLETE(read, 5, 0, do_mtd_io,
|
|
mtd_name_complete),
|
|
U_BOOT_SUBCMD_MKENT_COMPLETE(write, 5, 0, do_mtd_io,
|
|
mtd_name_complete),
|
|
U_BOOT_SUBCMD_MKENT_COMPLETE(dump, 4, 0, do_mtd_io,
|
|
mtd_name_complete),
|
|
U_BOOT_SUBCMD_MKENT_COMPLETE(erase, 4, 0, do_mtd_erase,
|
|
mtd_name_complete),
|
|
U_BOOT_SUBCMD_MKENT_COMPLETE(bad, 2, 1, do_mtd_bad,
|
|
mtd_name_complete));
|