--- /dev/null
+// 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>
+
+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)
+{
+ return 0;
+}
+
+static unsigned int dfu_polltimeout_mtd(struct dfu_entity *dfu)
+{
+ 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;
+
+ 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 {
+ printf("%s: (%s) not supported!\n", __func__, st);
+ return -1;
+ }
+
+ 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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