Blackfin arch: fix bug - gpio_bank() macros messed up bank number caculating with positioning a gpio

The whole story:

Before BF51x merged, all the MAX_BLACKFIN_GPIOS are integral multiple of GPIO_BANKSIZE (= 16).
But BF51x provides MAX_BLACKFIN_GPIOS = 40 which includes 3 banks and the 3rd bank has only 8
GPIO pins.

Therefore, gpio_bank() macros is correct when you try to find a GPIO in which bank (GPIO_35 is
in bank 2). But on BF51x gpio_bank(MAX_BLACKFIN_GPIOS) only gives out 2 banks instead of 3
banks for some static array initialization.

This patch add a new macros gpio_bank_n() and GPIO_BANK_NUM to do bank number caculating and
remain the gpio_bank() macros for positioning a gpio in which bank.

Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/gpio.h b/arch/blackfin/include/asm/gpio.h
index d8485624006a..2a5e846a5382 100644
--- a/arch/blackfin/include/asm/gpio.h
+++ b/arch/blackfin/include/asm/gpio.h
@@ -85,10 +85,12 @@
 #define __ARCH_BLACKFIN_GPIO_H__
 
 #define gpio_bank(x) ((x) >> 4)
+#define gpio_bank_n(x) ((x) & 0xF ? ((x) >> 4) + 1 : (x) >> 4)
 #define gpio_bit(x)  (1<<((x) & 0xF))
 #define gpio_sub_n(x) ((x) & 0xF)
 
 #define GPIO_BANKSIZE 16
+#define GPIO_BANK_NUM gpio_bank_n(MAX_BLACKFIN_GPIOS)
 
 #define GPIO_0  0
 #define GPIO_1  1