3e0cc7ee04
pxa_gpio_mode() is a universal call that fiddles with the GAFR (gpio alternate function register.) GAFR does not exist on PXA3 CPUs, but instead the alternate functions are controlled via the MFP support code. Platforms are expected to configure the MFP according to their needs in their platform support code rather than drivers. We extend this idea to the GAFR, and make the gpio_direction_*() functions purely operate on the GPIO level. This means platform support code is entirely responsible for configuring the GPIOs alternate functions on all PXA CPU types. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
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* linux/include/asm-arm/arch-pxa/gpio.h
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*
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* PXA GPIO wrappers for arch-neutral GPIO calls
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*
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* Written by Philipp Zabel <philipp.zabel@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef __ASM_ARCH_PXA_GPIO_H
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#define __ASM_ARCH_PXA_GPIO_H
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#include <asm/arch/pxa-regs.h>
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#include <asm/irq.h>
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#include <asm/hardware.h>
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static inline int gpio_request(unsigned gpio, const char *label)
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{
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return 0;
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}
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static inline void gpio_free(unsigned gpio)
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{
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return;
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}
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extern int gpio_direction_input(unsigned gpio);
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extern int gpio_direction_output(unsigned gpio, int value);
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static inline int __gpio_get_value(unsigned gpio)
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{
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return GPLR(gpio) & GPIO_bit(gpio);
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}
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#define gpio_get_value(gpio) \
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(__builtin_constant_p(gpio) ? \
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__gpio_get_value(gpio) : \
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pxa_gpio_get_value(gpio))
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static inline void __gpio_set_value(unsigned gpio, int value)
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{
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if (value)
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GPSR(gpio) = GPIO_bit(gpio);
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else
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GPCR(gpio) = GPIO_bit(gpio);
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}
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#define gpio_set_value(gpio,value) \
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(__builtin_constant_p(gpio) ? \
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__gpio_set_value(gpio, value) : \
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pxa_gpio_set_value(gpio, value))
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#include <asm-generic/gpio.h> /* cansleep wrappers */
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#define gpio_to_irq(gpio) IRQ_GPIO(gpio)
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#define irq_to_gpio(irq) IRQ_TO_GPIO(irq)
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#endif
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