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[PATCH] GPIO API: PXA wrapper cleanup

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Based on the discussion last december (http://lkml.org/lkml/2006/12/20/242),
this patch:

  - moves the PXA_LAST_GPIO check into pxa_gpio_mode
  - fixes comment and includes in gpio.h
  - replaces the gpio_set/get_value macros with inline
    functions and adds a non-inline version to avoid
    code explosion when gpio is not a constant.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Philipp Zabel 2007-02-20 13:58:15 -08:00 committed by Linus Torvalds
parent 5d4675a811
commit 3deac046e2
3 changed files with 63 additions and 19 deletions
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28
arch/arm/mach-pxa/generic.c
View File

@ -36,6 +36,7 @@
#include <asm/mach/map.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/gpio.h>
#include <asm/arch/udc.h>
#include <asm/arch/pxafb.h>
#include <asm/arch/mmc.h>
@ -106,13 +107,16 @@ unsigned long long sched_clock(void)
* Handy function to set GPIO alternate functions
*/
void pxa_gpio_mode(int gpio_mode)
int pxa_gpio_mode(int gpio_mode)
{
unsigned long flags;
int gpio = gpio_mode & GPIO_MD_MASK_NR;
int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
int gafr;
if (gpio > PXA_LAST_GPIO)
return -EINVAL;
local_irq_save(flags);
if (gpio_mode & GPIO_DFLT_LOW)
GPCR(gpio) = GPIO_bit(gpio);
@ -125,10 +129,32 @@ void pxa_gpio_mode(int gpio_mode)
gafr = GAFR(gpio) & ~(0x3 << (((gpio) & 0xf)*2));
GAFR(gpio) = gafr | (fn << (((gpio) & 0xf)*2));
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(pxa_gpio_mode);
/*
* Return GPIO level
*/
int pxa_gpio_get_value(unsigned gpio)
{
return __gpio_get_value(gpio);
}
EXPORT_SYMBOL(pxa_gpio_get_value);
/*
* Set output GPIO level
*/
void pxa_gpio_set_value(unsigned gpio, int value)
{
__gpio_set_value(gpio, value);
}
EXPORT_SYMBOL(pxa_gpio_set_value);
/*
* Routine to safely enable or disable a clock in the CKEN
*/

42
include/asm-arm/arch-pxa/gpio.h
View File

@ -25,10 +25,8 @@
#define __ASM_ARCH_PXA_GPIO_H
#include <asm/arch/pxa-regs.h>
#include <asm/arch/irqs.h>
#include <asm/arch/hardware.h>
#include <asm/errno.h>
#include <asm/irq.h>
#include <asm/hardware.h>
static inline int gpio_request(unsigned gpio, const char *label)
{
@ -42,26 +40,36 @@ static inline void gpio_free(unsigned gpio)
static inline int gpio_direction_input(unsigned gpio)
{
if (gpio > PXA_LAST_GPIO)
return -EINVAL;
pxa_gpio_mode(gpio | GPIO_IN);
return pxa_gpio_mode(gpio | GPIO_IN);
}
static inline int gpio_direction_output(unsigned gpio)
{
if (gpio > PXA_LAST_GPIO)
return -EINVAL;
pxa_gpio_mode(gpio | GPIO_OUT);
return pxa_gpio_mode(gpio | GPIO_OUT);
}
/* REVISIT these macros are correct, but suffer code explosion
* for non-constant parameters. Provide out-line versions too.
*/
#define gpio_get_value(gpio) \
(GPLR(gpio) & GPIO_bit(gpio))
static inline int __gpio_get_value(unsigned gpio)
{
return GPLR(gpio) & GPIO_bit(gpio);
}
#define gpio_set_value(gpio,value) \
((value) ? (GPSR(gpio) = GPIO_bit(gpio)):(GPCR(gpio) = GPIO_bit(gpio)))
#define gpio_get_value(gpio) \
(__builtin_constant_p(gpio) ? \
__gpio_get_value(gpio) : \
pxa_gpio_get_value(gpio))
static inline void __gpio_set_value(unsigned gpio, int value)
{
if (value)
GPSR(gpio) = GPIO_bit(gpio);
else
GPCR(gpio) = GPIO_bit(gpio);
}
#define gpio_set_value(gpio,value) \
(__builtin_constant_p(gpio) ? \
__gpio_set_value(gpio, value) : \
pxa_gpio_set_value(gpio, value))
#include <asm-generic/gpio.h> /* cansleep wrappers */

12
include/asm-arm/arch-pxa/hardware.h
View File

@ -65,7 +65,17 @@
/*
* Handy routine to set GPIO alternate functions
*/
extern void pxa_gpio_mode( int gpio_mode );
extern int pxa_gpio_mode( int gpio_mode );
/*
* Return GPIO level, nonzero means high, zero is low
*/
extern int pxa_gpio_get_value(unsigned gpio);
/*
* Set output GPIO level
*/
extern void pxa_gpio_set_value(unsigned gpio, int value);
/*
* Routine to enable or disable CKEN