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ARM: 7841/1: sa1100: remove complex GPIO interface 

The SA1100 was implementing its own variants of gpio_get_value()
and gpio_set_value() and only selectively falling back to
gpiolib for extended (EGPIO) handling. However the driver in
gpio/gpio-sa1100.c already handles the same functionality for
these lines, yet remain unused.

The only upside would be things like a timing-critical hotpath
on bit-banged GPIO, but that kind of things does not seem to
happen on these GPIOs, so it is not worth having the extra
complexity.

Tested with some buttons on the Compaq iPAQ H3630.

Cc: Kristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Linus Walleij 2013-09-25 13:33:55 +01:00 committed by Russell King
parent 9a48aa4caf
commit 40ca061b1b
4 changed files with 3 additions and 57 deletions
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1
arch/arm/Kconfig
View File

@ -692,7 +692,6 @@ config ARCH_SA1100
select GENERIC_CLOCKEVENTS
select HAVE_IDE
select ISA
select NEED_MACH_GPIO_H
select NEED_MACH_MEMORY_H
select SPARSE_IRQ
help

55
arch/arm/mach-sa1100/include/mach/gpio.h
View File

@ -1,55 +0,0 @@
/*
* arch/arm/mach-sa1100/include/mach/gpio.h
*
* SA1100 GPIO wrappers for arch-neutral GPIO calls
*
* Written by Philipp Zabel <philipp.zabel@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __ASM_ARCH_SA1100_GPIO_H
#define __ASM_ARCH_SA1100_GPIO_H
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm-generic/gpio.h>
#define __ARM_GPIOLIB_COMPLEX
static inline int gpio_get_value(unsigned gpio)
{
if (__builtin_constant_p(gpio) && (gpio <= GPIO_MAX))
return GPLR & GPIO_GPIO(gpio);
else
return __gpio_get_value(gpio);
}
static inline void gpio_set_value(unsigned gpio, int value)
{
if (__builtin_constant_p(gpio) && (gpio <= GPIO_MAX))
if (value)
GPSR = GPIO_GPIO(gpio);
else
GPCR = GPIO_GPIO(gpio);
else
__gpio_set_value(gpio, value);
}
#define gpio_cansleep __gpio_cansleep
#endif

2
arch/arm/mach-sa1100/include/mach/h3xxx.h
View File

@ -13,6 +13,8 @@
#ifndef _INCLUDE_H3XXX_H_
#define _INCLUDE_H3XXX_H_
#include "hardware.h" /* Gives GPIO_MAX */
/* Physical memory regions corresponding to chip selects */
#define H3600_EGPIO_PHYS (SA1100_CS5_PHYS + 0x01000000)
#define H3600_BANK_2_PHYS SA1100_CS2_PHYS

2
drivers/gpio/gpio-sa1100.c
View File

@ -10,7 +10,7 @@
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/irqs.h>