[RFC v2 18/20] efi_loader: disk: use udevice instead of blk_desc

[AKASHI Takahiro]

In most of all cases, we can avoid using blk_desc which is expected
to be private to udevice(UCLASS_BLK), that is, the data should not
be manupulated outside the device driver unless really needed.

Now efi_disk's internally use dev_read/write() interfaces.

Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
 lib/efi_loader/efi_disk.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index 8dc7534278da..8e33af76711f 100644
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -48,7 +48,7 @@ struct efi_disk_obj {
 	unsigned int part;
 	struct efi_simple_file_system_protocol *volume;
 	lbaint_t offset;
-	struct blk_desc *desc;
+	struct udevice *dev; /* TODO: move it to efi_object */
 };
 
 /**
@@ -83,14 +83,12 @@ static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this,
 			void *buffer, enum efi_disk_direction direction)
 {
 	struct efi_disk_obj *diskobj;
-	struct blk_desc *desc;
 	int blksz;
 	int blocks;
 	unsigned long n;
 
 	diskobj = container_of(this, struct efi_disk_obj, ops);
-	desc = (struct blk_desc *) diskobj->desc;
-	blksz = desc->blksz;
+	blksz = diskobj->media.block_size;
 	blocks = buffer_size / blksz;
 	lba += diskobj->offset;
 
@@ -102,9 +100,9 @@ static efi_status_t efi_disk_rw_blocks(struct efi_block_io *this,
 		return EFI_BAD_BUFFER_SIZE;
 
 	if (direction == EFI_DISK_READ)
-		n = blk_dread(desc, lba, blocks, buffer);
+		n = dev_read(diskobj->dev, lba, blocks, buffer);
 	else
-		n = blk_dwrite(desc, lba, blocks, buffer);
+		n = dev_write(diskobj->dev, lba, blocks, buffer);
 
 	/* We don't do interrupts, so check for timers cooperatively */
 	efi_timer_check();
@@ -446,7 +444,6 @@ static efi_status_t efi_disk_add_dev(
 	diskobj->ops = block_io_disk_template;
 	diskobj->ifname = if_typename;
 	diskobj->dev_index = dev_index;
-	diskobj->desc = desc;
 
 	/* Fill in EFI IO Media info (for read/write callbacks) */
 	diskobj->media.removable_media = desc->removable;
@@ -745,20 +742,22 @@ bool efi_disk_is_system_part(efi_handle_t handle)
 {
 	struct efi_handler *handler;
 	struct efi_disk_obj *diskobj;
-	struct disk_partition info;
+	struct udevice *dev;
+	struct disk_part *part;
 	efi_status_t ret;
-	int r;
 
 	/* check if this is a block device */
 	ret = efi_search_protocol(handle, &efi_block_io_guid, &handler);
 	if (ret != EFI_SUCCESS)
 		return false;
 
+	/* find a partition udevice */
 	diskobj = container_of(handle, struct efi_disk_obj, header);
-
-	r = part_get_info(diskobj->desc, diskobj->part, &info);
-	if (r)
+	dev = diskobj->dev;
+	if (!dev || dev->driver->id != UCLASS_PARTITION)
 		return false;
 
-	return !!(info.bootable & PART_EFI_SYSTEM_PARTITION);
+	part = dev_get_uclass_plat(dev);
+
+	return !!(part->gpt_part_info.bootable & PART_EFI_SYSTEM_PARTITION);
 }
-- 
2.33.0