MTD block - abstraction over MTD subsystem, allowing to read and write in blocks using BLK UCLASS.
- Read algorithm:
1. Convert start block number to start address. 2. Read block_dev->blksz bytes using mtd_read() and add to start address pointer block_dev->blksz bytes, until the requested number of blocks have been read.
- Write algorithm:
1. Convert start block number to start address. 2. Round this address down by mtd->erasesize.
Erase addr Start addr | | v v +----------------+----------------+----------------+ | blksz | blksz | blksz | +----------------+----------------+----------------+
3. Calculate offset between this two addresses. 4. Read mtd->erasesize bytes using mtd_read() into temporary buffer from erase address.
Erase addr Start addr | | v v +----------------+----------------+----------------+ | blksz | blksz | blksz | +----------------+----------------+----------------+ ^ mtd->erasesize = blksz * 3 | | |
mtd_read() from here
5. Copy data from user buffer to temporary buffer with offset, calculated at step 3. 6. Erase and write mtd->erasesize bytes at erase address pointer using mtd_erase/mtd_write(). 7. Add to erase address pointer mtd->erasesize bytes. 8. goto 1 until the requested number of blocks have been written.
Signed-off-by: Alexey Romanov avromanov@salutedevices.com --- drivers/block/blk-uclass.c | 1 + drivers/mtd/Makefile | 1 + drivers/mtd/mtdblock.c | 170 +++++++++++++++++++++++++++++++++++++ include/linux/mtd/mtd.h | 12 +++ 4 files changed, 184 insertions(+) create mode 100644 drivers/mtd/mtdblock.c
diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c index 77066da352..ab0a9105c9 100644 --- a/drivers/block/blk-uclass.c +++ b/drivers/block/blk-uclass.c @@ -37,6 +37,7 @@ static struct { { UCLASS_PVBLOCK, "pvblock" }, { UCLASS_BLKMAP, "blkmap" }, { UCLASS_RKMTD, "rkmtd" }, + { UCLASS_MTD, "mtd" }, };
static enum uclass_id uclass_name_to_iftype(const char *uclass_idname) diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile index c638980ea2..993b122ac4 100644 --- a/drivers/mtd/Makefile +++ b/drivers/mtd/Makefile @@ -26,6 +26,7 @@ obj-y += onenand/ obj-y += spi/ obj-$(CONFIG_MTD_UBI) += ubi/ obj-$(CONFIG_NVMXIP) += nvmxip/ +obj-$(CONFIG_BLK) += mtdblock.o
#SPL/TPL build else diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c new file mode 100644 index 0000000000..0563d0b795 --- /dev/null +++ b/drivers/mtd/mtdblock.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2024 SaluteDevices, Inc. + * + * Author: Alexey Romanov avromanov@salutedevices.com + */ + +#include <blk.h> +#include <dm/device.h> +#include <dm/device-internal.h> +#include <linux/mtd/mtd.h> + +int mtd_bind(struct udevice *dev, struct mtd_info **mtd) +{ + struct blk_desc *bdesc; + struct udevice *bdev; + int ret; + + ret = blk_create_devicef(dev, "mtd_blk", "blk", UCLASS_MTD, + dev_seq(dev), 512, 0, &bdev); + if (ret) { + pr_err("Cannot create block device"); + return ret; + } + + bdesc = dev_get_uclass_plat(bdev); + dev_set_priv(bdev, mtd); + bdesc->bdev = bdev; + + return 0; +} + +static ulong mtd_bread(struct udevice *dev, lbaint_t start, lbaint_t blkcnt, + void *dst) +{ + struct blk_desc *block_dev = dev_get_uclass_plat(dev); + struct mtd_info *mtd = blk_desc_to_mtd(block_dev); + unsigned int sect_size = block_dev->blksz; + lbaint_t cur = start; + ulong read_cnt = 0; + + while (read_cnt < blkcnt) { + int ret; + loff_t sect_start = cur * sect_size; + size_t retlen; + + ret = mtd_read(mtd, sect_start, sect_size, &retlen, dst); + if (ret) + return ret; + + if (retlen != sect_size) { + pr_err("mtdblock: failed to read block 0x%lx\n", cur); + return -EIO; + } + + cur++; + dst += sect_size; + read_cnt++; + } + + return read_cnt; +} + +static int mtd_erase_write(struct mtd_info *mtd, uint64_t start, const void *src) +{ + int ret; + size_t retlen; + struct erase_info erase = { 0 }; + + erase.mtd = mtd; + erase.addr = start; + erase.len = mtd->erasesize; + + ret = mtd_erase(mtd, &erase); + if (ret) + return ret; + + ret = mtd_write(mtd, start, mtd->erasesize, &retlen, src); + if (ret) + return ret; + + if (retlen != mtd->erasesize) { + pr_err("mtdblock: failed to read block at 0x%llx\n", start); + return -EIO; + } + + return 0; +} + +static ulong mtd_bwrite(struct udevice *dev, lbaint_t start, lbaint_t blkcnt, + const void *src) +{ + struct blk_desc *block_dev = dev_get_uclass_plat(dev); + struct mtd_info *mtd = blk_desc_to_mtd(block_dev); + unsigned int sect_size = block_dev->blksz; + lbaint_t cur = start, blocks_todo = blkcnt; + ulong write_cnt = 0; + u8 *buf; + int ret = 0; + + buf = malloc(mtd->erasesize); + if (!buf) + return -ENOMEM; + + while (blocks_todo > 0) { + loff_t sect_start = cur * sect_size; + loff_t erase_start = ALIGN_DOWN(sect_start, mtd->erasesize); + u32 offset = sect_start - erase_start; + size_t cur_size = min_t(size_t, mtd->erasesize - offset, + blocks_todo * sect_size); + size_t retlen; + lbaint_t written; + + ret = mtd_read(mtd, erase_start, mtd->erasesize, &retlen, buf); + if (ret) + goto out; + + if (retlen != mtd->erasesize) { + pr_err("mtdblock: failed to read block 0x%lx\n", cur); + ret = -EIO; + goto out; + } + + memcpy(buf + offset, src, cur_size); + + ret = mtd_erase_write(mtd, erase_start, buf); + if (ret) + goto out; + + written = cur_size / sect_size; + + blocks_todo -= written; + cur += written; + src += cur_size; + write_cnt += written; + } + +out: + free(buf); + + if (ret) + return ret; + + return write_cnt; +} + +static int mtd_blk_probe(struct udevice *dev) +{ + int ret; + + ret = device_probe(dev); + if (ret) { + pr_err("Probing %s failed (err=%d)\n", dev->name, ret); + return ret; + } + + return 0; +} + +static const struct blk_ops mtd_blk_ops = { + .read = mtd_bread, + .write = mtd_bwrite, +}; + +U_BOOT_DRIVER(mtd_blk) = { + .name = "mtd_blk", + .id = UCLASS_BLK, + .ops = &mtd_blk_ops, + .probe = mtd_blk_probe, +}; diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 09f5269887..9b997fadd1 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -26,6 +26,9 @@ #include <dm/device.h> #endif #include <dm/ofnode.h> +#if IS_ENABLED(CONFIG_BLK) +#include <blk.h> +#endif
#define MAX_MTD_DEVICES 32 #endif @@ -412,6 +415,15 @@ int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
+#if IS_ENABLED(CONFIG_BLK) +static inline struct mtd_info *blk_desc_to_mtd(struct blk_desc *bdesc) +{ + return *((struct mtd_info **)dev_get_priv(bdesc->bdev)); +} + +int mtd_bind(struct udevice *dev, struct mtd_info **mtd); +#endif + int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops); int mtd_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops);