mtd: nand: denali: max_banks calculation changed in revision 5.1
Read Denali hardware revision number and use it to
calculate max_banks, The encoding of max_banks changed
in Denali revision 5.1.
[ Linux commit : 271707b1d817f5104e02b2bd1bab43f0c8759418 ]
Signed-off-by: Graham Moore <grmoore@opensource.altera.com>
[Brian: parentheses around macro arg]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
[Masahiro: import from Linux and adjust ioread32() to readl() ]
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 018d14f..5894fcc 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -431,7 +431,16 @@
static void detect_max_banks(struct denali_nand_info *denali)
{
uint32_t features = readl(denali->flash_reg + FEATURES);
- denali->max_banks = 2 << (features & FEATURES__N_BANKS);
+ /*
+ * 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(
+ readl(denali->flash_reg + REVISION));
+ 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)