28735a7253
It's been pointed out that output GPIOs should have an initial value, to avoid signal glitching ... among other things, it can be some time before a driver is ready. This patch corrects that oversight, fixing - documentation - platforms supporting the GPIO interface - users of that call (just one for now, others are pending) There's only one user of this call for now since most platforms are still using non-generic GPIO setup code, which in most cases already couples the initial value with its "set output mode" request. Note that most platforms are clear about the hardware letting the output value be set before the pin direction is changed, but the s3c241x docs are vague on that topic ... so those chips might not avoid the glitches. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Andrew Victor <andrew@sanpeople.com> Acked-by: Milan Svoboda <msvoboda@ra.rockwell.com> Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com> 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>
147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/*
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* linux/include/asm-arm/arch-omap/gpio.h
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*
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* OMAP GPIO handling defines and functions
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*
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* Copyright (C) 2003-2005 Nokia Corporation
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*
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* Written by Juha Yrjölä <juha.yrjola@nokia.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_OMAP_GPIO_H
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#define __ASM_ARCH_OMAP_GPIO_H
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#include <asm/hardware.h>
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#include <asm/arch/irqs.h>
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#include <asm/io.h>
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#define OMAP_MPUIO_BASE (void __iomem *)0xfffb5000
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#ifdef CONFIG_ARCH_OMAP730
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#define OMAP_MPUIO_INPUT_LATCH 0x00
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#define OMAP_MPUIO_OUTPUT 0x02
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#define OMAP_MPUIO_IO_CNTL 0x04
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#define OMAP_MPUIO_KBR_LATCH 0x08
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#define OMAP_MPUIO_KBC 0x0a
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#define OMAP_MPUIO_GPIO_EVENT_MODE 0x0c
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#define OMAP_MPUIO_GPIO_INT_EDGE 0x0e
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#define OMAP_MPUIO_KBD_INT 0x10
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#define OMAP_MPUIO_GPIO_INT 0x12
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#define OMAP_MPUIO_KBD_MASKIT 0x14
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#define OMAP_MPUIO_GPIO_MASKIT 0x16
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#define OMAP_MPUIO_GPIO_DEBOUNCING 0x18
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#define OMAP_MPUIO_LATCH 0x1a
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#else
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#define OMAP_MPUIO_INPUT_LATCH 0x00
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#define OMAP_MPUIO_OUTPUT 0x04
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#define OMAP_MPUIO_IO_CNTL 0x08
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#define OMAP_MPUIO_KBR_LATCH 0x10
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#define OMAP_MPUIO_KBC 0x14
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#define OMAP_MPUIO_GPIO_EVENT_MODE 0x18
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#define OMAP_MPUIO_GPIO_INT_EDGE 0x1c
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#define OMAP_MPUIO_KBD_INT 0x20
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#define OMAP_MPUIO_GPIO_INT 0x24
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#define OMAP_MPUIO_KBD_MASKIT 0x28
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#define OMAP_MPUIO_GPIO_MASKIT 0x2c
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#define OMAP_MPUIO_GPIO_DEBOUNCING 0x30
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#define OMAP_MPUIO_LATCH 0x34
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#endif
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#define OMAP_MPUIO(nr) (OMAP_MAX_GPIO_LINES + (nr))
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#define OMAP_GPIO_IS_MPUIO(nr) ((nr) >= OMAP_MAX_GPIO_LINES)
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#define OMAP_GPIO_IRQ(nr) (OMAP_GPIO_IS_MPUIO(nr) ? \
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IH_MPUIO_BASE + ((nr) & 0x0f) : \
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IH_GPIO_BASE + (nr))
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extern int omap_gpio_init(void); /* Call from board init only */
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extern int omap_request_gpio(int gpio);
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extern void omap_free_gpio(int gpio);
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extern void omap_set_gpio_direction(int gpio, int is_input);
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extern void omap_set_gpio_dataout(int gpio, int enable);
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extern int omap_get_gpio_datain(int gpio);
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/*-------------------------------------------------------------------------*/
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/* wrappers for "new style" GPIO calls. the old OMAP-specfic ones should
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* eventually be removed (along with this errno.h inclusion), and maybe
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* gpios should put MPUIOs last too.
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*/
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#include <asm/errno.h>
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static inline int gpio_request(unsigned gpio, const char *label)
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{
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return omap_request_gpio(gpio);
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}
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static inline void gpio_free(unsigned gpio)
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{
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omap_free_gpio(gpio);
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}
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static inline int __gpio_set_direction(unsigned gpio, int is_input)
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{
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if (cpu_class_is_omap2()) {
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if (gpio > OMAP_MAX_GPIO_LINES)
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return -EINVAL;
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} else {
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if (gpio > (OMAP_MAX_GPIO_LINES + 16 /* MPUIO */))
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return -EINVAL;
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}
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omap_set_gpio_direction(gpio, is_input);
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return 0;
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}
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static inline int gpio_direction_input(unsigned gpio)
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{
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return __gpio_set_direction(gpio, 1);
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}
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static inline int gpio_direction_output(unsigned gpio, int value)
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{
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omap_set_gpio_dataout(gpio, value);
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return __gpio_set_direction(gpio, 0);
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}
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static inline int gpio_get_value(unsigned gpio)
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{
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return omap_get_gpio_datain(gpio);
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}
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static inline void gpio_set_value(unsigned gpio, int value)
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{
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omap_set_gpio_dataout(gpio, value);
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}
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#include <asm-generic/gpio.h> /* cansleep wrappers */
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static inline int gpio_to_irq(unsigned gpio)
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{
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return OMAP_GPIO_IRQ(gpio);
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}
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static inline int irq_to_gpio(unsigned irq)
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{
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if (cpu_class_is_omap1() && (irq < (IH_MPUIO_BASE + 16)))
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return (irq - IH_MPUIO_BASE) + OMAP_MAX_GPIO_LINES;
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return irq - IH_GPIO_BASE;
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}
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#endif
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