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arm nomadik: add gpio support

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Signed-off-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This commit is contained in:
Alessandro Rubini 2009-07-24 11:27:03 +02:00 committed by Heiko Schocher
parent 549b98306d
commit 60cbfbfd0f
3 changed files with 142 additions and 1 deletions
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2
cpu/arm926ejs/nomadik/Makefile
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@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(SOC).a
COBJS = timer.o
COBJS = timer.o gpio.o
SOBJS = reset.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)

99
cpu/arm926ejs/nomadik/gpio.c Normal file
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@ -0,0 +1,99 @@
/*
* (C) Copyright 2009 Alessandro Rubini
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/gpio.h>
static unsigned long gpio_base[4] = {
NOMADIK_GPIO0_BASE,
NOMADIK_GPIO1_BASE,
NOMADIK_GPIO2_BASE,
NOMADIK_GPIO3_BASE
};
enum gpio_registers {
GPIO_DAT = 0x00, /* data register */
GPIO_DATS = 0x04, /* data set */
GPIO_DATC = 0x08, /* data clear */
GPIO_PDIS = 0x0c, /* pull disable */
GPIO_DIR = 0x10, /* direction */
GPIO_DIRS = 0x14, /* direction set */
GPIO_DIRC = 0x18, /* direction clear */
GPIO_AFSLA = 0x20, /* alternate function select A */
GPIO_AFSLB = 0x24, /* alternate function select B */
};
static inline unsigned long gpio_to_base(int gpio)
{
return gpio_base[gpio / 32];
}
static inline u32 gpio_to_bit(int gpio)
{
return 1 << (gpio & 0x1f);
}
void nmk_gpio_af(int gpio, int alternate_function)
{
unsigned long base = gpio_to_base(gpio);
u32 bit = gpio_to_bit(gpio);
u32 afunc, bfunc;
/* alternate function is 0..3, with one bit per register */
afunc = readl(base + GPIO_AFSLA) & ~bit;
bfunc = readl(base + GPIO_AFSLB) & ~bit;
if (alternate_function & 1) afunc |= bit;
if (alternate_function & 2) bfunc |= bit;
writel(afunc, base + GPIO_AFSLA);
writel(bfunc, base + GPIO_AFSLB);
}
void nmk_gpio_dir(int gpio, int dir)
{
unsigned long base = gpio_to_base(gpio);
u32 bit = gpio_to_bit(gpio);
if (dir)
writel(bit, base + GPIO_DIRS);
else
writel(bit, base + GPIO_DIRC);
}
void nmk_gpio_set(int gpio, int val)
{
unsigned long base = gpio_to_base(gpio);
u32 bit = gpio_to_bit(gpio);
if (val)
writel(bit, base + GPIO_DATS);
else
writel(bit, base + GPIO_DATC);
}
int nmk_gpio_get(int gpio)
{
unsigned long base = gpio_to_base(gpio);
u32 bit = gpio_to_bit(gpio);
return readl(base + GPIO_DAT) & bit;
}

42
include/asm-arm/arch-nomadik/gpio.h Normal file
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@ -0,0 +1,42 @@
/*
* (C) Copyright 2009 Alessandro Rubini
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 __NMK_GPIO_H__
#define __NMK_GPIO_H__
/*
* These functions are called from the soft-i2c driver, but
* are also used by board files to set output bits.
*/
enum nmk_af { /* alternate function settings */
GPIO_GPIO = 0,
GPIO_ALT_A,
GPIO_ALT_B,
GPIO_ALT_C
};
extern void nmk_gpio_af(int gpio, int alternate_function);
extern void nmk_gpio_dir(int gpio, int dir);
extern void nmk_gpio_set(int gpio, int val);
extern int nmk_gpio_get(int gpio);
#endif /* __NMK_GPIO_H__ */