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dm: blk: Add functions to select a hardware partition

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The block device uclass does not currently support selecting a particular
hardware partition but this is needed for MMC. Add it so that the blk API
can support MMC properly.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-05-01 13:52:30 -06:00
parent 69f45cd53b
commit cd0fb55b64
2 changed files with 59 additions and 0 deletions
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29
drivers/block/blk-uclass.c
View File

@ -165,6 +165,18 @@ static int get_desc(enum if_type if_type, int devnum, struct blk_desc **descp)
return found_more ? -ENOENT : -ENODEV;
}
int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart)
{
struct udevice *dev;
int ret;
ret = blk_get_device(if_type, devnum, &dev);
if (ret)
return ret;
return blk_select_hwpart(dev, hwpart);
}
int blk_list_part(enum if_type if_type)
{
struct blk_desc *desc;
@ -291,6 +303,23 @@ ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start,
return blk_dwrite(desc, start, blkcnt, buffer);
}
int blk_select_hwpart(struct udevice *dev, int hwpart)
{
const struct blk_ops *ops = blk_get_ops(dev);
if (!ops)
return -ENOSYS;
if (!ops->select_hwpart)
return 0;
return ops->select_hwpart(dev, hwpart);
}
int blk_dselect_hwpart(struct blk_desc *desc, int hwpart)
{
return blk_select_hwpart(desc->bdev, hwpart);
}
int blk_first_device(int if_type, struct udevice **devp)
{
struct blk_desc *desc;

30
include/blk.h
View File

@ -211,6 +211,25 @@ struct blk_ops {
*/
unsigned long (*erase)(struct udevice *dev, lbaint_t start,
lbaint_t blkcnt);
/**
* select_hwpart() - select a particular hardware partition
*
* Some devices (e.g. MMC) can support partitioning at the hardware
* level. This is quite separate from the normal idea of
* software-based partitions. MMC hardware partitions must be
* explicitly selected. Once selected only the region of the device
* covered by that partition is accessible.
*
* The MMC standard provides for two boot partitions (numbered 1 and 2),
* rpmb (3), and up to 4 addition general-purpose partitions (4-7).
*
* @desc: Block device to update
* @hwpart: Hardware partition number to select. 0 means the raw
* device, 1 is the first partition, 2 is the second, etc.
* @return 0 if OK, -ve on error
*/
int (*select_hwpart)(struct udevice *dev, int hwpart);
};
#define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops)
@ -329,6 +348,17 @@ int blk_unbind_all(int if_type);
*/
int blk_find_max_devnum(enum if_type if_type);
/**
* blk_select_hwpart() - select a hardware partition
*
* Select a hardware partition if the device supports it (typically MMC does)
*
* @dev: Device to update
* @hwpart: Partition number to select
* @return 0 if OK, -ve on error
*/
int blk_select_hwpart(struct udevice *dev, int hwpart);
#else
#include <errno.h>
/*