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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 <linux/err.h>
#include <linux/ctype.h>
static bool mtd_is_aligned_with_block_size(struct mtd_info *mtd, u64 size)
{
return !do_div(size, mtd->erasesize);
}
/* Logic taken from cmd/mtd.c:mtd_oob_write_is_empty() */
static bool mtd_page_is_empty(struct mtd_oob_ops *op)
{
int i;
for (i = 0; i < op->len; i++)
if (op->datbuf[i] != 0xff)
return false;
/* oob is not used, with MTD_OPS_AUTO_OOB & ooblen=0 */
return true;
}
static int mtd_block_op(enum dfu_op op, struct dfu_entity *dfu,
u64 offset, void *buf, long *len)
{
u64 off, lim, remaining, lock_ofs, lock_len;
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 = lock_ofs = 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 = lock_len = round_up(*len, mtd->erasesize);
erase_op.mtd = mtd;
erase_op.addr = off;
erase_op.len = mtd->erasesize;
erase_op.scrub = 0;
debug("Unlocking the mtd device\n");
ret = mtd_unlock(mtd, lock_ofs, lock_len);
if (ret && ret != -EOPNOTSUPP) {
printf("MTD device unlock failed\n");
return 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 if (has_pages && dfu->data.mtd.ubi && mtd_page_is_empty(&io_op)) {
/* in case of ubi partition, do not write an empty page, only skip it */
ret = 0;
io_op.retlen = mtd->writesize;
io_op.oobretlen = mtd->oobsize;
} 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;
}
if (op == DFU_OP_WRITE) {
/* Write done, lock again */
debug("Locking the mtd device\n");
ret = mtd_lock(mtd, lock_ofs, lock_len);
if (ret == -EOPNOTSUPP)
ret = 0;
else if (ret)
printf("MTD device lock failed\n");
}
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.mtd.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.mtd.ubi)
return DFU_MANIFEST_POLL_TIMEOUT;
return DFU_DEFAULT_POLL_TIMEOUT;
}
int dfu_fill_entity_mtd(struct dfu_entity *dfu, char *devstr, char **argv, int argc)
{
char *s;
struct mtd_info *mtd;
int 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;
dfu->max_buf_size = mtd->erasesize;
if (argc < 1)
return -EINVAL;
if (!strcmp(argv[0], "raw")) {
if (argc != 3)
return -EINVAL;
dfu->layout = DFU_RAW_ADDR;
dfu->data.mtd.start = hextoul(argv[1], &s);
if (*s)
return -EINVAL;
dfu->data.mtd.size = hextoul(argv[2], &s);
if (*s)
return -EINVAL;
} else if ((!strcmp(argv[0], "part")) || (!strcmp(argv[0], "partubi"))) {
struct mtd_info *partition;
int partnum = 0;
bool part_found = false;
if (argc != 2)
return -EINVAL;
dfu->layout = DFU_RAW_ADDR;
part = dectoul(argv[1], &s);
if (*s)
return -EINVAL;
/* register partitions with MTDIDS/MTDPARTS or OF fallback */
mtd_probe_devices();
partnum = 0;
list_for_each_entry(partition, &mtd->partitions, node) {
partnum++;
if (partnum == part) {
part_found = true;
break;
}
}
if (!part_found) {
printf("No partition %d in %s\n", part, mtd->name);
return -1;
}
log_debug("partition %d:%s in %s\n", partnum, partition->name, mtd->name);
dfu->data.mtd.start = partition->offset;
dfu->data.mtd.size = partition->size;
if (!strcmp(argv[0], "partubi"))
dfu->data.mtd.ubi = 1;
} else {
printf("%s: Memory layout (%s) not supported!\n", __func__, argv[0]);
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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