[RFC PATCH 1/5] pbl: add block I/O API

[Ahmad Fatoum <ahmad@a3f.at>]

We already have some PBL MCI implementations in barebox, but none
are used for chainloading a barebox from a file system.

In preparation for supporting first stage boot on SoCs where it's
customary for both the BootROM and first stage bootloader to load the
follow-up stage from FAT, add a very basic block I/O API that MCI
drivers can implement.

Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
---
 include/pbl.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/pbl.h b/include/pbl.h
index 787bd8293ff1..7cc162dfd039 100644
--- a/include/pbl.h
+++ b/include/pbl.h
@@ -7,6 +7,8 @@
 #ifndef __PBL_H__
 #define __PBL_H__
 
+#include <linux/types.h>
+
 extern unsigned long free_mem_ptr;
 extern unsigned long free_mem_end_ptr;
 
@@ -14,6 +16,10 @@ void pbl_barebox_uncompress(void *dest, void *compressed_start, unsigned int len
 
 #ifdef __PBL__
 #define IN_PBL	1
+struct pbl_bio {
+	void *priv;
+	int (*read)(struct pbl_bio *bio, off_t block_off, void *buf, unsigned int nblocks);
+};
 #else
 #define IN_PBL	0
 #endif
-- 
2.20.1


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