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@@ -0,0 +1,232 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * dfu_mtd.c -- DFU for MTD device.
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+ *
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+ * Copyright (C) 2019,STMicroelectronics - All Rights Reserved
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+ *
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+ * Based on dfu_nand.c
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+ */
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+
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+#include <common.h>
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+#include <dfu.h>
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+#include <mtd.h>
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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 int mtd_block_op(enum dfu_op op, struct dfu_entity *dfu,
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+ u64 offset, void *buf, long *len)
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+{
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+ u64 off, lim, remaining;
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+ struct mtd_info *mtd = dfu->data.mtd.info;
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+ struct mtd_oob_ops io_op = {};
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+ int ret = 0;
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+ bool has_pages = mtd->type == MTD_NANDFLASH ||
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+ mtd->type == MTD_MLCNANDFLASH;
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+
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+ /* if buf == NULL return total size of the area */
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+ if (!buf) {
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+ *len = dfu->data.mtd.size;
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+ return 0;
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+ }
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+
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+ off = dfu->data.mtd.start + offset + dfu->bad_skip;
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+ lim = dfu->data.mtd.start + dfu->data.mtd.size;
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+
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+ if (off >= lim) {
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+ printf("Limit reached 0x%llx\n", lim);
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+ *len = 0;
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+ return op == DFU_OP_READ ? 0 : -EIO;
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+ }
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+ /* limit request with the available size */
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+ if (off + *len >= lim)
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+ *len = lim - off;
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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 0;
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+ }
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+
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+ /* first erase */
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+ if (op == DFU_OP_WRITE) {
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+ struct erase_info erase_op = {};
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+
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+ remaining = round_up(*len, mtd->erasesize);
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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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+ erase_op.scrub = 0;
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+
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+ while (remaining) {
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+ if (erase_op.addr + remaining > lim) {
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+ printf("Limit reached 0x%llx while erasing at offset 0x%llx\n",
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+ lim, off);
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+ return -EIO;
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+ }
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+
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+ ret = mtd_erase(mtd, &erase_op);
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+
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+ if (ret) {
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+ /* Abort if its not a bad block error */
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+ if (ret != -EIO) {
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+ printf("Failure while erasing at offset 0x%llx\n",
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+ erase_op.fail_addr);
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+ return 0;
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+ }
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+ printf("Skipping bad block at 0x%08llx\n",
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+ erase_op.addr);
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+ } else {
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+ remaining -= mtd->erasesize;
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+ }
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+
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+ /* Continue erase behind bad block */
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+ erase_op.addr += mtd->erasesize;
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+ }
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+ }
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+
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+ io_op.mode = MTD_OPS_AUTO_OOB;
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+ io_op.len = *len;
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+ if (has_pages && io_op.len > mtd->writesize)
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+ io_op.len = mtd->writesize;
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+ io_op.ooblen = 0;
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+ io_op.datbuf = buf;
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+ io_op.oobbuf = NULL;
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+
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+ /* Loop over to do the actual read/write */
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+ remaining = *len;
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+ while (remaining) {
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+ if (off + remaining > lim) {
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+ printf("Limit reached 0x%llx while %s at offset 0x%llx\n",
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+ lim, op == DFU_OP_READ ? "reading" : "writing",
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+ off);
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+ if (op == DFU_OP_READ) {
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+ *len -= remaining;
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+ return 0;
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+ } else {
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+ return -EIO;
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+ }
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+ }
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+
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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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+ dfu->bad_skip += mtd->erasesize;
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+ continue;
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+ }
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+
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+ if (op == DFU_OP_READ)
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+ ret = mtd_read_oob(mtd, off, &io_op);
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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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+ if (ret) {
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+ printf("Failure while %s at offset 0x%llx\n",
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+ op == DFU_OP_READ ? "reading" : "writing", off);
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+ return -EIO;
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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.len = remaining;
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+ if (has_pages && io_op.len > mtd->writesize)
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+ io_op.len = mtd->writesize;
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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 dfu_get_medium_size_mtd(struct dfu_entity *dfu, u64 *size)
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+{
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+ *size = dfu->data.mtd.info->size;
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+
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+ return 0;
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+}
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+
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+static int dfu_read_medium_mtd(struct dfu_entity *dfu, u64 offset, void *buf,
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+ long *len)
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+{
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+ int ret = -1;
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+
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+ switch (dfu->layout) {
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+ case DFU_RAW_ADDR:
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+ ret = mtd_block_op(DFU_OP_READ, dfu, offset, buf, len);
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+ break;
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+ default:
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+ printf("%s: Layout (%s) not (yet) supported!\n", __func__,
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+ dfu_get_layout(dfu->layout));
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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 dfu_write_medium_mtd(struct dfu_entity *dfu,
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+ u64 offset, void *buf, long *len)
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+{
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+ int ret = -1;
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+
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+ switch (dfu->layout) {
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+ case DFU_RAW_ADDR:
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+ ret = mtd_block_op(DFU_OP_WRITE, dfu, offset, buf, len);
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+ break;
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+ default:
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+ printf("%s: Layout (%s) not (yet) supported!\n", __func__,
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+ dfu_get_layout(dfu->layout));
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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 dfu_flush_medium_mtd(struct dfu_entity *dfu)
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+{
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+ return 0;
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+}
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+
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+static unsigned int dfu_polltimeout_mtd(struct dfu_entity *dfu)
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+{
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+ return DFU_DEFAULT_POLL_TIMEOUT;
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+}
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+
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+int dfu_fill_entity_mtd(struct dfu_entity *dfu, char *devstr, char *s)
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+{
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+ char *st;
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+ struct mtd_info *mtd;
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+ bool has_pages;
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+
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+ mtd = get_mtd_device_nm(devstr);
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+ if (IS_ERR_OR_NULL(mtd))
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+ return -ENODEV;
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+ put_mtd_device(mtd);
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+
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+ dfu->dev_type = DFU_DEV_MTD;
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+ dfu->data.mtd.info = mtd;
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+
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+ has_pages = mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
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+ dfu->max_buf_size = has_pages ? mtd->erasesize : 0;
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+
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+ st = strsep(&s, " ");
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+ if (!strcmp(st, "raw")) {
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+ dfu->layout = DFU_RAW_ADDR;
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+ dfu->data.mtd.start = simple_strtoul(s, &s, 16);
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+ s++;
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+ dfu->data.mtd.size = simple_strtoul(s, &s, 16);
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+ } else {
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+ printf("%s: (%s) not supported!\n", __func__, st);
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+ return -1;
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+ }
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+
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+ dfu->get_medium_size = dfu_get_medium_size_mtd;
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+ dfu->read_medium = dfu_read_medium_mtd;
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+ dfu->write_medium = dfu_write_medium_mtd;
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+ dfu->flush_medium = dfu_flush_medium_mtd;
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+ dfu->poll_timeout = dfu_polltimeout_mtd;
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+
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+ /* initial state */
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+ dfu->inited = 0;
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+
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+ return 0;
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+}
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