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disk: Handle partition to block device offset conversion

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Convert the read/write/erase offset from one within a partition
to one within a block device, to correctly access the data on
the block device for both write and erase operations.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
This commit is contained in:
Marek Vasut 2023-08-14 01:46:44 +02:00 • committed by Tom Rini
parent 9161c2c90d
commit 2bc0dfef9f
1 changed files with 52 additions and 16 deletions
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68
disk/disk-uclass.c
View file

@ -17,6 +17,36 @@
#include <dm/device-internal.h>
#include <dm/lists.h>
/**
* disk_blk_part_validate() - Check whether access to partition is within limits
*
* @dev: Device (partition udevice)
* @start: Start block for the access(from start of partition)
* @blkcnt: Number of blocks to access (within the partition)
* @return 0 on valid block range, or -ve on error.
*/
static int disk_blk_part_validate(struct udevice *dev, lbaint_t start, lbaint_t blkcnt)
{
if (device_get_uclass_id(dev) != UCLASS_PARTITION)
return -ENOSYS;
return 0;
}
/**
* disk_blk_part_offset() - Compute offset from start of block device
*
* @dev: Device (partition udevice)
* @start: Start block for the access (from start of partition)
* @return Start block for the access (from start of block device)
*/
static lbaint_t disk_blk_part_offset(struct udevice *dev, lbaint_t start)
{
struct disk_part *part = dev_get_uclass_plat(dev);
return start + part->gpt_part_info.start;
}
int part_create_block_devices(struct udevice *blk_dev)
{
int part, count;
@ -162,21 +192,21 @@ U_BOOT_DRIVER(blk_partition) = {
unsigned long disk_blk_read(struct udevice *dev, lbaint_t start,
lbaint_t blkcnt, void *buffer)
{
struct disk_part *part = dev_get_uclass_plat(dev);
int ret = disk_blk_part_validate(dev, start, blkcnt);
if (device_get_uclass_id(dev) != UCLASS_PARTITION)
return -ENOSYS;
if (ret)
return ret;
return blk_read(dev_get_parent(dev), start + part->gpt_part_info.start,
return blk_read(dev_get_parent(dev), disk_blk_part_offset(dev, start),
blkcnt, buffer);
}
/**
* disk_blk_write() - Write to a block device
*
* @dev: Device to write to
* @start: Start block for the write
* @blkcnt: Number of blocks to write
* @dev: Device to write to (partition udevice)
* @start: Start block for the write (from start of partition)
* @blkcnt: Number of blocks to write (within the partition)
* @buffer: Data to write
* @return number of blocks written (which may be less than @blkcnt),
* or -ve on error. This never returns 0 unless @blkcnt is 0
@ -184,28 +214,34 @@ unsigned long disk_blk_read(struct udevice *dev, lbaint_t start,
unsigned long disk_blk_write(struct udevice *dev, lbaint_t start,
lbaint_t blkcnt, const void *buffer)
{
if (device_get_uclass_id(dev) != UCLASS_PARTITION)
return -ENOSYS;
int ret = disk_blk_part_validate(dev, start, blkcnt);
return blk_write(dev_get_parent(dev), start, blkcnt, buffer);
if (ret)
return ret;
return blk_write(dev_get_parent(dev), disk_blk_part_offset(dev, start),
blkcnt, buffer);
}
/**
* disk_blk_erase() - Erase part of a block device
*
* @dev: Device to erase
* @start: Start block for the erase
* @blkcnt: Number of blocks to erase
* @dev: Device to erase (partition udevice)
* @start: Start block for the erase (from start of partition)
* @blkcnt: Number of blocks to erase (within the partition)
* @return number of blocks erased (which may be less than @blkcnt),
* or -ve on error. This never returns 0 unless @blkcnt is 0
*/
unsigned long disk_blk_erase(struct udevice *dev, lbaint_t start,
lbaint_t blkcnt)
{
if (device_get_uclass_id(dev) != UCLASS_PARTITION)
return -ENOSYS;
int ret = disk_blk_part_validate(dev, start, blkcnt);
return blk_erase(dev_get_parent(dev), start, blkcnt);
if (ret)
return ret;
return blk_erase(dev_get_parent(dev), disk_blk_part_offset(dev, start),
blkcnt);
}
UCLASS_DRIVER(partition) = {