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@@ -0,0 +1,473 @@
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+// 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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+
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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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+
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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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+
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+ return len;
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ if (woob) {
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+ u64 oob_off = page * mtd->oobsize;
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+
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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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+
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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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+
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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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+
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+ mtd_show_parts(part, level + 1);
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+ }
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ return true;
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+}
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+
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+static int do_mtd_list(void)
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+{
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+ struct mtd_info *mtd;
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+ int dev_nb = 0;
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+
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+ /* Ensure all devices (and their partitions) are probed */
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+ mtd_probe_devices();
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+
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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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+
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+ dev_nb++;
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+ }
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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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+
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+ return CMD_RET_SUCCESS;
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+}
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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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+ /*
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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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+
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+ return ret;
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+}
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+
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+static int do_mtd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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+{
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+ struct mtd_info *mtd;
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+ const char *cmd;
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+ char *mtd_name;
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+
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+ /* All MTD commands need at least two arguments */
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+ if (argc < 2)
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+ return CMD_RET_USAGE;
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+
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+ /* Parse the command name and its optional suffixes */
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+ cmd = argv[1];
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+
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+ /* List the MTD devices if that is what the user wants */
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+ if (strcmp(cmd, "list") == 0)
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+ return do_mtd_list();
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+
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+ /*
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+ * The remaining commands require also at least a device ID.
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+ * Check the selected device is valid. Ensure it is probed.
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+ */
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+ if (argc < 3)
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+ return CMD_RET_USAGE;
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+
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+ mtd_name = argv[2];
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+ mtd_probe_devices();
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+ mtd = get_mtd_device_nm(mtd_name);
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+ if (IS_ERR_OR_NULL(mtd)) {
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+ printf("MTD device %s not found, ret %ld\n",
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+ mtd_name, PTR_ERR(mtd));
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+ return CMD_RET_FAILURE;
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+ }
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+ put_mtd_device(mtd);
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+
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+ argc -= 3;
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+ argv += 3;
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+
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+ /* Do the parsing */
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+ if (!strncmp(cmd, "read", 4) || !strncmp(cmd, "dump", 4) ||
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+ !strncmp(cmd, "write", 5)) {
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+ bool has_pages = mtd->type == MTD_NANDFLASH ||
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+ mtd->type == MTD_MLCNANDFLASH;
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+ bool dump, read, raw, woob, write_empty_pages;
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+ struct mtd_oob_ops io_op = {};
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+ uint user_addr = 0, npages;
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+ u64 start_off, off, len, remaining, default_len;
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+ u32 oob_len;
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+ u8 *buf;
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+ int ret;
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+
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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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+
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+ if (!dump) {
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+ if (!argc)
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+ return CMD_RET_USAGE;
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+
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+ user_addr = simple_strtoul(argv[0], NULL, 16);
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+ argc--;
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+ argv++;
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+ }
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+
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+ start_off = argc > 0 ? simple_strtoul(argv[0], NULL, 16) : 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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+ return CMD_RET_FAILURE;
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+ }
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+
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+ default_len = dump ? mtd->writesize : mtd->size;
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+ len = argc > 1 ? simple_strtoul(argv[1], NULL, 16) :
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+ 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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+
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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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+
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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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+
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+ if (!buf) {
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+ printf("Could not map/allocate the user buffer\n");
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+ return CMD_RET_FAILURE;
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+ }
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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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+
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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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+
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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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+
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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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+
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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,
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+ woob);
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+
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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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+ return CMD_RET_FAILURE;
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+ }
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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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+
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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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+
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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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+
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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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+ return CMD_RET_FAILURE;
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+ }
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+
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+ } else if (!strcmp(cmd, "erase")) {
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+ bool scrub = strstr(cmd, ".dontskipbad");
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+ struct erase_info erase_op = {};
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+ u64 off, len;
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+ int ret;
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+
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+ off = argc > 0 ? simple_strtoul(argv[0], NULL, 16) : 0;
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+ len = argc > 1 ? simple_strtoul(argv[1], NULL, 16) : mtd->size;
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+
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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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+ return CMD_RET_FAILURE;
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+ }
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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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+ return CMD_RET_FAILURE;
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+ }
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+
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+ printf("Erasing 0x%08llx ... 0x%08llx (%d eraseblock(s))\n",
|
|
|
+ off, off + len - 1, mtd_div_by_eb(len, mtd));
|
|
|
+
|
|
|
+ erase_op.mtd = mtd;
|
|
|
+ erase_op.addr = off;
|
|
|
+ erase_op.len = len;
|
|
|
+ erase_op.scrub = scrub;
|
|
|
+
|
|
|
+ while (erase_op.len) {
|
|
|
+ ret = mtd_erase(mtd, &erase_op);
|
|
|
+
|
|
|
+ /* Abort if its not a bad block error */
|
|
|
+ if (ret != -EIO)
|
|
|
+ break;
|
|
|
+
|
|
|
+ printf("Skipping bad block at 0x%08llx\n",
|
|
|
+ erase_op.fail_addr);
|
|
|
+
|
|
|
+ /* Skip bad block and continue behind it */
|
|
|
+ erase_op.len -= erase_op.fail_addr - erase_op.addr;
|
|
|
+ erase_op.len -= mtd->erasesize;
|
|
|
+ erase_op.addr = erase_op.fail_addr + mtd->erasesize;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (ret && ret != -EIO)
|
|
|
+ return CMD_RET_FAILURE;
|
|
|
+ } else if (!strcmp(cmd, "bad")) {
|
|
|
+ loff_t off;
|
|
|
+
|
|
|
+ if (!mtd_can_have_bb(mtd)) {
|
|
|
+ printf("Only NAND-based devices can have bad blocks\n");
|
|
|
+ return CMD_RET_SUCCESS;
|
|
|
+ }
|
|
|
+
|
|
|
+ printf("MTD device %s bad blocks list:\n", mtd->name);
|
|
|
+ for (off = 0; off < mtd->size; off += mtd->erasesize)
|
|
|
+ if (mtd_block_isbad(mtd, off))
|
|
|
+ printf("\t0x%08llx\n", off);
|
|
|
+ } else {
|
|
|
+ return CMD_RET_USAGE;
|
|
|
+ }
|
|
|
+
|
|
|
+ return CMD_RET_SUCCESS;
|
|
|
+}
|
|
|
+
|
|
|
+static char mtd_help_text[] =
|
|
|
+#ifdef CONFIG_SYS_LONGHELP
|
|
|
+ "- 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\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(mtd, 10, 1, do_mtd, "MTD utils", mtd_help_text);
|