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nand: Add support for unlock.invert

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NAND unlock command allows an invert bit to be set to unlock all but
the selected page range.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
[scottwood@freescale.com: updated docs and added comment about invert bit]
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Joe Hershberger 2012-08-22 16:49:42 -05:00 committed by Scott Wood
parent d62e9caaaf
commit eee623a504
4 changed files with 28 additions and 8 deletions
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13
common/cmd_nand.c
View File

@ -749,11 +749,18 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
return 0;
}
if (strcmp(cmd, "unlock") == 0) {
if (strncmp(cmd, "unlock", 5) == 0) {
int allexcept = 0;
s = strchr(cmd, '.');
if (s && !strcmp(s, ".allexcept"))
allexcept = 1;
if (arg_off_size(argc - 2, argv + 2, &dev, &off, &size) < 0)
return 1;
if (!nand_unlock(&nand_info[dev], off, size)) {
if (!nand_unlock(&nand_info[dev], off, size, allexcept)) {
puts("NAND flash successfully unlocked\n");
} else {
puts("Error unlocking NAND flash, "
@ -807,7 +814,7 @@ U_BOOT_CMD(
"\n"
"nand lock [tight] [status]\n"
" bring nand to lock state or display locked pages\n"
"nand unlock [offset] [size] - unlock section"
"nand unlock[.allexcept] [offset] [size] - unlock section"
#endif
#ifdef CONFIG_ENV_OFFSET_OOB
"\n"

2
doc/README.nand
View File

@ -228,6 +228,8 @@ NAND locking command (for chips with active LOCKPRE pin)
"nand unlock [offset] [size]"
unlock consecutive area (can be called multiple times for different areas)
"nand unlock.allexcept [offset] [size]"
unlock all except specified consecutive area
I have tested the code with board containing 128MiB NAND large page chips
and 32MiB small page chips.

17
drivers/mtd/nand/nand_util.c
View File

@ -317,18 +317,20 @@ int nand_get_lock_status(struct mtd_info *mtd, loff_t offset)
* @param start start byte address
* @param length number of bytes to unlock (must be a multiple of
* page size nand->writesize)
* @param allexcept if set, unlock everything not selected
*
* @return 0 on success, -1 in case of error
*/
int nand_unlock(struct mtd_info *mtd, ulong start, ulong length)
int nand_unlock(struct mtd_info *mtd, ulong start, ulong length, int allexcept)
{
int ret = 0;
int chipnr;
int status;
int page;
struct nand_chip *chip = mtd->priv;
printf ("nand_unlock: start: %08x, length: %d!\n",
(int)start, (int)length);
debug("nand_unlock%s: start: %08x, length: %d!\n",
allexcept ? " (allexcept)" : "", start, length);
/* select the NAND device */
chipnr = (int)(start >> chip->chip_shift);
@ -368,6 +370,15 @@ int nand_unlock(struct mtd_info *mtd, ulong start, ulong length)
/* submit ADDRESS of LAST page to unlock */
page += (int)(length >> chip->page_shift);
/*
* Page addresses for unlocking are supposed to be block-aligned.
* At least some NAND chips use the low bit to indicate that the
* page range should be inverted.
*/
if (allexcept)
page |= 1;
chip->cmdfunc(mtd, NAND_CMD_UNLOCK2, -1, page & chip->pagemask);
/* call wait ready function */

4
include/nand.h
View File

@ -144,8 +144,8 @@ int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts);
#define NAND_LOCK_STATUS_LOCK 0x02
#define NAND_LOCK_STATUS_UNLOCK 0x04
int nand_lock( nand_info_t *meminfo, int tight );
int nand_unlock( nand_info_t *meminfo, ulong start, ulong length );
int nand_lock(nand_info_t *meminfo, int tight);
int nand_unlock(nand_info_t *meminfo, ulong start, ulong length, int allexcept);
int nand_get_lock_status(nand_info_t *meminfo, loff_t offset);
int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst);