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mtd: nand: denali: max_banks calculation changed in revision 5.1

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Read Denali hardware revision number and use it to
calculate max_banks,  The encoding of max_banks changed
in Denali revision 5.1.

Signed-off-by: Graham Moore <grmoore@opensource.altera.com>
[Brian: parentheses around macro arg]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Graham Moore 2015-07-21 09:39:31 -05:00 committed by Brian Norris
parent 9c07d094bb
commit 271707b1d8
2 changed files with 12 additions and 1 deletions
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11
drivers/mtd/nand/denali.c
View File

@ -458,8 +458,17 @@ static void find_valid_banks(struct denali_nand_info *denali)
static void detect_max_banks(struct denali_nand_info *denali)
{
uint32_t features = ioread32(denali->flash_reg + FEATURES);
/*
* Read the revision register, so we can calculate the max_banks
* properly: the encoding changed from rev 5.0 to 5.1
*/
u32 revision = MAKE_COMPARABLE_REVISION(
ioread32(denali->flash_reg + REVISION));
denali->max_banks = 2 << (features & FEATURES__N_BANKS);
if (revision < REVISION_5_1)
denali->max_banks = 2 << (features & FEATURES__N_BANKS);
else
denali->max_banks = 1 << (features & FEATURES__N_BANKS);
}
static void detect_partition_feature(struct denali_nand_info *denali)

2
drivers/mtd/nand/denali.h
View File

@ -178,6 +178,8 @@
#define REVISION 0x370
#define REVISION__VALUE 0xffff
#define MAKE_COMPARABLE_REVISION(x) swab16((x) & REVISION__VALUE)
#define REVISION_5_1 0x00000501
#define ONFI_DEVICE_FEATURES 0x380
#define ONFI_DEVICE_FEATURES__VALUE 0x003f