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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * dfu_mtd.c -- DFU for MTD device.
- *
- * Copyright (C) 2019,STMicroelectronics - All Rights Reserved
- *
- * Based on dfu_nand.c
- */
- #include <common.h>
- #include <dfu.h>
- #include <mtd.h>
- #include <jffs2/load_kernel.h>
- #include <linux/err.h>
- static bool mtd_is_aligned_with_block_size(struct mtd_info *mtd, u64 size)
- {
- return !do_div(size, mtd->erasesize);
- }
- static int mtd_block_op(enum dfu_op op, struct dfu_entity *dfu,
- u64 offset, void *buf, long *len)
- {
- u64 off, lim, remaining;
- struct mtd_info *mtd = dfu->data.mtd.info;
- struct mtd_oob_ops io_op = {};
- int ret = 0;
- bool has_pages = mtd->type == MTD_NANDFLASH ||
- mtd->type == MTD_MLCNANDFLASH;
- /* if buf == NULL return total size of the area */
- if (!buf) {
- *len = dfu->data.mtd.size;
- return 0;
- }
- off = dfu->data.mtd.start + offset + dfu->bad_skip;
- lim = dfu->data.mtd.start + dfu->data.mtd.size;
- if (off >= lim) {
- printf("Limit reached 0x%llx\n", lim);
- *len = 0;
- return op == DFU_OP_READ ? 0 : -EIO;
- }
- /* limit request with the available size */
- if (off + *len >= lim)
- *len = lim - off;
- if (!mtd_is_aligned_with_block_size(mtd, off)) {
- printf("Offset not aligned with a block (0x%x)\n",
- mtd->erasesize);
- return 0;
- }
- /* first erase */
- if (op == DFU_OP_WRITE) {
- struct erase_info erase_op = {};
- remaining = round_up(*len, mtd->erasesize);
- erase_op.mtd = mtd;
- erase_op.addr = off;
- erase_op.len = mtd->erasesize;
- erase_op.scrub = 0;
- while (remaining) {
- if (erase_op.addr + remaining > lim) {
- printf("Limit reached 0x%llx while erasing at offset 0x%llx\n",
- lim, off);
- return -EIO;
- }
- ret = mtd_erase(mtd, &erase_op);
- if (ret) {
- /* Abort if its not a bad block error */
- if (ret != -EIO) {
- printf("Failure while erasing at offset 0x%llx\n",
- erase_op.fail_addr);
- return 0;
- }
- printf("Skipping bad block at 0x%08llx\n",
- erase_op.addr);
- } else {
- remaining -= mtd->erasesize;
- }
- /* Continue erase behind bad block */
- erase_op.addr += mtd->erasesize;
- }
- }
- io_op.mode = MTD_OPS_AUTO_OOB;
- io_op.len = *len;
- if (has_pages && io_op.len > mtd->writesize)
- io_op.len = mtd->writesize;
- io_op.ooblen = 0;
- io_op.datbuf = buf;
- io_op.oobbuf = NULL;
- /* Loop over to do the actual read/write */
- remaining = *len;
- while (remaining) {
- if (off + remaining > lim) {
- printf("Limit reached 0x%llx while %s at offset 0x%llx\n",
- lim, op == DFU_OP_READ ? "reading" : "writing",
- off);
- if (op == DFU_OP_READ) {
- *len -= remaining;
- return 0;
- } else {
- return -EIO;
- }
- }
- /* Skip the block if it is bad */
- if (mtd_is_aligned_with_block_size(mtd, off) &&
- mtd_block_isbad(mtd, off)) {
- off += mtd->erasesize;
- dfu->bad_skip += mtd->erasesize;
- continue;
- }
- if (op == DFU_OP_READ)
- ret = mtd_read_oob(mtd, off, &io_op);
- else
- ret = mtd_write_oob(mtd, off, &io_op);
- if (ret) {
- printf("Failure while %s at offset 0x%llx\n",
- op == DFU_OP_READ ? "reading" : "writing", off);
- return -EIO;
- }
- off += io_op.retlen;
- remaining -= io_op.retlen;
- io_op.datbuf += io_op.retlen;
- io_op.len = remaining;
- if (has_pages && io_op.len > mtd->writesize)
- io_op.len = mtd->writesize;
- }
- return ret;
- }
- static int dfu_get_medium_size_mtd(struct dfu_entity *dfu, u64 *size)
- {
- *size = dfu->data.mtd.info->size;
- return 0;
- }
- static int dfu_read_medium_mtd(struct dfu_entity *dfu, u64 offset, void *buf,
- long *len)
- {
- int ret = -1;
- switch (dfu->layout) {
- case DFU_RAW_ADDR:
- ret = mtd_block_op(DFU_OP_READ, dfu, offset, buf, len);
- break;
- default:
- printf("%s: Layout (%s) not (yet) supported!\n", __func__,
- dfu_get_layout(dfu->layout));
- }
- return ret;
- }
- static int dfu_write_medium_mtd(struct dfu_entity *dfu,
- u64 offset, void *buf, long *len)
- {
- int ret = -1;
- switch (dfu->layout) {
- case DFU_RAW_ADDR:
- ret = mtd_block_op(DFU_OP_WRITE, dfu, offset, buf, len);
- break;
- default:
- printf("%s: Layout (%s) not (yet) supported!\n", __func__,
- dfu_get_layout(dfu->layout));
- }
- return ret;
- }
- static int dfu_flush_medium_mtd(struct dfu_entity *dfu)
- {
- struct mtd_info *mtd = dfu->data.mtd.info;
- u64 remaining;
- int ret;
- /* in case of ubi partition, erase rest of the partition */
- if (dfu->data.nand.ubi) {
- struct erase_info erase_op = {};
- erase_op.mtd = dfu->data.mtd.info;
- erase_op.addr = round_up(dfu->data.mtd.start + dfu->offset +
- dfu->bad_skip, mtd->erasesize);
- erase_op.len = mtd->erasesize;
- erase_op.scrub = 0;
- remaining = dfu->data.mtd.start + dfu->data.mtd.size -
- erase_op.addr;
- while (remaining) {
- ret = mtd_erase(mtd, &erase_op);
- if (ret) {
- /* Abort if its not a bad block error */
- if (ret != -EIO)
- break;
- printf("Skipping bad block at 0x%08llx\n",
- erase_op.addr);
- }
- /* Skip bad block and continue behind it */
- erase_op.addr += mtd->erasesize;
- remaining -= mtd->erasesize;
- }
- }
- return 0;
- }
- static unsigned int dfu_polltimeout_mtd(struct dfu_entity *dfu)
- {
- /*
- * Currently, Poll Timeout != 0 is only needed on nand
- * ubi partition, as sectors which are not used need
- * to be erased
- */
- if (dfu->data.nand.ubi)
- return DFU_MANIFEST_POLL_TIMEOUT;
- return DFU_DEFAULT_POLL_TIMEOUT;
- }
- int dfu_fill_entity_mtd(struct dfu_entity *dfu, char *devstr, char *s)
- {
- char *st;
- struct mtd_info *mtd;
- bool has_pages;
- int ret, part;
- mtd = get_mtd_device_nm(devstr);
- if (IS_ERR_OR_NULL(mtd))
- return -ENODEV;
- put_mtd_device(mtd);
- dfu->dev_type = DFU_DEV_MTD;
- dfu->data.mtd.info = mtd;
- has_pages = mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
- dfu->max_buf_size = has_pages ? mtd->erasesize : 0;
- st = strsep(&s, " ");
- if (!strcmp(st, "raw")) {
- dfu->layout = DFU_RAW_ADDR;
- dfu->data.mtd.start = simple_strtoul(s, &s, 16);
- s++;
- dfu->data.mtd.size = simple_strtoul(s, &s, 16);
- } else if ((!strcmp(st, "part")) || (!strcmp(st, "partubi"))) {
- char mtd_id[32];
- struct mtd_device *mtd_dev;
- u8 part_num;
- struct part_info *pi;
- dfu->layout = DFU_RAW_ADDR;
- part = simple_strtoul(s, &s, 10);
- sprintf(mtd_id, "%s,%d", devstr, part - 1);
- printf("using id '%s'\n", mtd_id);
- mtdparts_init();
- ret = find_dev_and_part(mtd_id, &mtd_dev, &part_num, &pi);
- if (ret != 0) {
- printf("Could not locate '%s'\n", mtd_id);
- return -1;
- }
- dfu->data.mtd.start = pi->offset;
- dfu->data.mtd.size = pi->size;
- if (!strcmp(st, "partubi"))
- dfu->data.mtd.ubi = 1;
- } else {
- printf("%s: Memory layout (%s) not supported!\n", __func__, st);
- return -1;
- }
- if (!mtd_is_aligned_with_block_size(mtd, dfu->data.mtd.start)) {
- printf("Offset not aligned with a block (0x%x)\n",
- mtd->erasesize);
- return -EINVAL;
- }
- if (!mtd_is_aligned_with_block_size(mtd, dfu->data.mtd.size)) {
- printf("Size not aligned with a block (0x%x)\n",
- mtd->erasesize);
- return -EINVAL;
- }
- dfu->get_medium_size = dfu_get_medium_size_mtd;
- dfu->read_medium = dfu_read_medium_mtd;
- dfu->write_medium = dfu_write_medium_mtd;
- dfu->flush_medium = dfu_flush_medium_mtd;
- dfu->poll_timeout = dfu_polltimeout_mtd;
- /* initial state */
- dfu->inited = 0;
- return 0;
- }
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