In include/blk.h, Simon suggested: ===> /* * These functions should take struct udevice instead of struct blk_desc, * but this is convenient for migration to driver model. Add a 'd' prefix * to the function operations, so that blk_read(), etc. can be reserved for * functions with the correct arguments. */ unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt, void *buffer); unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt, const void *buffer); unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt); <===
So new interfaces are provided with this patch.
They are expected to be used everywhere in U-Boot at the end. The exceptions are block device drivers, partition drivers and efi_disk which should know details of blk_desc structure.
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org --- disk/disk-uclass.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++ include/part.h | 7 ++++ 2 files changed, 101 insertions(+)
diff --git a/disk/disk-uclass.c b/disk/disk-uclass.c index 4918a2f72d1e..72ff62ebf581 100644 --- a/disk/disk-uclass.c +++ b/disk/disk-uclass.c @@ -146,6 +146,100 @@ U_BOOT_DRIVER(blk_partition) = { .ops = &blk_part_ops, };
+/* + * BLOCK IO APIs + */ +static struct blk_desc *dev_get_blk(struct udevice *dev) +{ + struct blk_desc *block_dev; + + switch (device_get_uclass_id(dev)) { + /* + * We won't support UCLASS_BLK with dev_* interfaces. + */ + case UCLASS_PARTITION: + block_dev = dev_get_uclass_plat(dev_get_parent(dev)); + break; + default: + block_dev = NULL; + break; + } + + return block_dev; +} + +unsigned long dev_read(struct udevice *dev, lbaint_t start, + lbaint_t blkcnt, void *buffer) +{ + struct blk_desc *block_dev; + const struct blk_ops *ops; + struct disk_part *part; + lbaint_t start_in_disk; + ulong blks_read; + + block_dev = dev_get_blk(dev); + if (!block_dev) + return -ENOSYS; + + ops = blk_get_ops(dev); + if (!ops->read) + return -ENOSYS; + + start_in_disk = start; + if (device_get_uclass_id(dev) == UCLASS_PARTITION) { + part = dev_get_uclass_plat(dev); + start_in_disk += part->gpt_part_info.start; + } + + if (blkcache_read(block_dev->if_type, block_dev->devnum, + start_in_disk, blkcnt, block_dev->blksz, buffer)) + return blkcnt; + blks_read = ops->read(dev, start, blkcnt, buffer); + if (blks_read == blkcnt) + blkcache_fill(block_dev->if_type, block_dev->devnum, + start_in_disk, blkcnt, block_dev->blksz, buffer); + + return blks_read; +} + +unsigned long dev_write(struct udevice *dev, lbaint_t start, + lbaint_t blkcnt, const void *buffer) +{ + struct blk_desc *block_dev; + const struct blk_ops *ops; + + block_dev = dev_get_blk(dev); + if (!block_dev) + return -ENOSYS; + + ops = blk_get_ops(dev); + if (!ops->write) + return -ENOSYS; + + blkcache_invalidate(block_dev->if_type, block_dev->devnum); + + return ops->write(dev, start, blkcnt, buffer); +} + +unsigned long dev_erase(struct udevice *dev, lbaint_t start, + lbaint_t blkcnt) +{ + struct blk_desc *block_dev; + const struct blk_ops *ops; + + block_dev = dev_get_blk(dev); + if (!block_dev) + return -ENOSYS; + + ops = blk_get_ops(dev); + if (!ops->erase) + return -ENOSYS; + + blkcache_invalidate(block_dev->if_type, block_dev->devnum); + + return ops->erase(dev, start, blkcnt); +} + UCLASS_DRIVER(partition) = { .id = UCLASS_PARTITION, .per_device_plat_auto = sizeof(struct disk_part), diff --git a/include/part.h b/include/part.h index 95e30e60af10..d4e5cd921db1 100644 --- a/include/part.h +++ b/include/part.h @@ -264,6 +264,13 @@ struct udevice; */ int part_create_block_devices(struct udevice *blk_dev);
+unsigned long dev_read(struct udevice *dev, lbaint_t start, + lbaint_t blkcnt, void *buffer); +unsigned long dev_write(struct udevice *dev, lbaint_t start, + lbaint_t blkcnt, const void *buffer); +unsigned long dev_erase(struct udevice *dev, lbaint_t start, + lbaint_t blkcnt); + #else static inline struct blk_desc *blk_get_dev(const char *ifname, int dev) { return NULL; }