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/*
* arch/arm/mach-pxa/include/mach/gpio.h
*
* PXA 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_PXA_GPIO_H
#define __ASM_ARCH_PXA_GPIO_H
#include <mach/pxa-regs.h>
#include <asm/irq.h>
#include <mach/hardware.h>
#include <asm-generic/gpio.h>
/* NOTE: some PXAs have fewer on-chip GPIOs (like PXA255, with 85).
* Those cases currently cause holes in the GPIO number space.
*/
#define NR_BUILTIN_GPIO 128
static inline int gpio_get_value(unsigned gpio)
{
if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO))
return GPLR(gpio) & GPIO_bit(gpio);
else
return __gpio_get_value(gpio);
}
static inline void gpio_set_value(unsigned gpio, int value)
{
if (__builtin_constant_p(gpio) && (gpio < NR_BUILTIN_GPIO)) {
if (value)
GPSR(gpio) = GPIO_bit(gpio);
else
GPCR(gpio) = GPIO_bit(gpio);
} else {
__gpio_set_value(gpio, value);
}
}
#define gpio_cansleep __gpio_cansleep
#define gpio_to_irq(gpio) IRQ_GPIO(gpio)
#define irq_to_gpio(irq) IRQ_TO_GPIO(irq)
#ifdef CONFIG_CPU_PXA26x
/* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
* as well as their Alternate Function value being '1' for GPIO in GAFRx.
*/
static inline int __gpio_is_inverted(unsigned gpio)
{
return cpu_is_pxa25x() && gpio > 85;
}
#else
static inline int __gpio_is_inverted(unsigned gpio) { return 0; }
#endif
/*
* On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
* function of a GPIO, and GPDRx cannot be altered once configured. It
* is attributed as "occupied" here (I know this terminology isn't
* accurate, you are welcome to propose a better one :-)
*/
static inline int __gpio_is_occupied(unsigned gpio)
{
if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
int dir = GPDR(gpio) & GPIO_bit(gpio);
if (__gpio_is_inverted(gpio))
return af != 1 || dir == 0;
else
return af != 0 || dir != 0;
} else
return GPDR(gpio) & GPIO_bit(gpio);
}
typedef int (*set_wake_t)(unsigned int irq, unsigned int on);
extern void pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn);
#endif
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