sh: make gpio_get/set_value() O(1)
This patch modifies the table based SuperH gpio implementation to
make use of direct table lookups. With this change the functions
gpio_get_value() and gpio_set_value() are O(1).
Tested on Migo-R using bitbanging mmc. Performance is improved from
11 KBytes/s to 26 Kbytes/s.
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/include/asm/gpio.h b/arch/sh/include/asm/gpio.h
index 9067365..942fefa 100644
--- a/arch/sh/include/asm/gpio.h
+++ b/arch/sh/include/asm/gpio.h
@@ -20,7 +20,7 @@
#endif
typedef unsigned short pinmux_enum_t;
-typedef unsigned char pinmux_flag_t;
+typedef unsigned short pinmux_flag_t;
#define PINMUX_TYPE_NONE 0
#define PINMUX_TYPE_FUNCTION 1
@@ -34,6 +34,11 @@
#define PINMUX_FLAG_WANT_PULLUP (1 << 3)
#define PINMUX_FLAG_WANT_PULLDOWN (1 << 4)
+#define PINMUX_FLAG_DBIT_SHIFT 5
+#define PINMUX_FLAG_DBIT (0x1f << PINMUX_FLAG_DBIT_SHIFT)
+#define PINMUX_FLAG_DREG_SHIFT 10
+#define PINMUX_FLAG_DREG (0x3f << PINMUX_FLAG_DREG_SHIFT)
+
struct pinmux_gpio {
pinmux_enum_t enum_id;
pinmux_flag_t flags;