[U-Boot] [RFC][PATCH] OneNAND: Remove base address offset usage

[dirk.behme at googlemail.com <dirk.behme@googlemail.com>]

While locally preparing some U-Boot patches for ARM based OMAP3 boards, some
using OneNAND and some using NAND, we found some differences in OneNAND and
NAND command address handling.

As this might confuse users (it already confused us), we like to align OneNAND
and NAND address handling.

The issue is that cmd_onenand.c subtracts the onenand base address from the
addresses you type into the u-boot command line so, unlike nand, you can't
use addresses relative to the start of the onenand part e.g. this won't work:

onenand read 82000000 280000 400000

you have to use:

onenand read 82000000 20280000 400000

Looking at recent git, the only board currently using OneNAND is Apollon, and
for this the OneNAND base address is 0 (apollon.h)

#define	CFG_ONENAND_BASE	0x00000000

so patch below won't break any existing boards and will align OneNAND and NAND
handling on boards where OneNAND base address is != 0.

Signed-off-by: Steve Sakoman <sakoman@gmail.com>
Signed-off-by: Manikandan Pillai <mani.pillai@ti.com>
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>

---

Index: foo/common/cmd_onenand.c
===================================================================
--- foo.orig/common/cmd_onenand.c
+++ foo/common/cmd_onenand.c
@@ -58,8 +58,6 @@ int do_onenand(cmd_tbl_t * cmdtp, int fl
 			} else {
 				start = simple_strtoul(argv[2], NULL, 10);
 				end = simple_strtoul(argv[3], NULL, 10);
-				start -= (unsigned long)onenand_chip.base;
-				end -= (unsigned long)onenand_chip.base;
 
 				start >>= onenand_chip.erase_shift;
 				end >>= onenand_chip.erase_shift;
@@ -92,8 +90,6 @@ int do_onenand(cmd_tbl_t * cmdtp, int fl
 			size_t retlen = 0;
 			int oob = strncmp(argv[1], "read.oob", 8) ? 0 : 1;
 
-			ofs -= (unsigned long)onenand_chip.base;
-
 			if (oob)
 				onenand_read_oob(&onenand_mtd, ofs, len,
 						 &retlen, (u_char *) addr);
@@ -111,8 +107,6 @@ int do_onenand(cmd_tbl_t * cmdtp, int fl
 			size_t len = simple_strtoul(argv[4], NULL, 16);
 			size_t retlen = 0;
 
-			ofs -= (unsigned long)onenand_chip.base;
-
 			onenand_write(&onenand_mtd, ofs, len, &retlen,
 				      (u_char *) addr);
 			printf("Done\n");
Index: foo/common/env_onenand.c
===================================================================
--- foo.orig/common/env_onenand.c
+++ foo/common/env_onenand.c
@@ -66,7 +66,6 @@ void env_relocate_spec(void)
 	size_t retlen;
 
 	env_addr = CFG_ENV_ADDR;
-	env_addr -= (unsigned long) onenand_chip.base;
 
 	/* Check OneNAND exist */
 	if (onenand_mtd.oobblock)
@@ -101,7 +100,6 @@ int saveenv(void)
 
 	instr.len = CFG_ENV_SIZE;
 	instr.addr = env_addr;
-	instr.addr -= (unsigned long)onenand_chip.base;
 	if (onenand_erase(&onenand_mtd, &instr)) {
 		printf("OneNAND: erase failed at 0x%08lx\n", env_addr);
 		return 1;
@@ -111,7 +109,6 @@ int saveenv(void)
 	env_ptr->crc =
 	    crc32(0, env_ptr->data, ONENAND_ENV_SIZE(onenand_mtd));
 
-	env_addr -= (unsigned long)onenand_chip.base;
 	if (onenand_write(&onenand_mtd, env_addr, onenand_mtd.oobblock, &retlen,
 	     (u_char *) env_ptr)) {
 		printf("OneNAND: write failed at 0x%08x\n", instr.addr);