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sh: make gpio_get/set_value() O(1)

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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>
This commit is contained in:
Magnus Damm 2008-12-25 18:17:09 +09:00 • committed by Paul Mundt
parent 5376071069
commit 18801be7f8
2 changed files with 43 additions and 12 deletions
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7
arch/sh/include/asm/gpio.h
View file

@ -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 @@ typedef unsigned char pinmux_flag_t;
#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;