diff options
| -rw-r--r-- | cpu/arm926ejs/nomadik/Makefile | 2 | ||||
| -rw-r--r-- | cpu/arm926ejs/nomadik/gpio.c | 99 | ||||
| -rw-r--r-- | include/asm-arm/arch-nomadik/gpio.h | 42 |
3 files changed, 142 insertions, 1 deletions
diff --git a/cpu/arm926ejs/nomadik/Makefile b/cpu/arm926ejs/nomadik/Makefile index e3bd2ee..0fc9f2a 100644 --- a/cpu/arm926ejs/nomadik/Makefile +++ b/cpu/arm926ejs/nomadik/Makefile @@ -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) diff --git a/cpu/arm926ejs/nomadik/gpio.c b/cpu/arm926ejs/nomadik/gpio.c new file mode 100644 index 0000000..62a375b --- /dev/null +++ b/cpu/arm926ejs/nomadik/gpio.c @@ -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; +} diff --git a/include/asm-arm/arch-nomadik/gpio.h b/include/asm-arm/arch-nomadik/gpio.h new file mode 100644 index 0000000..1d3c9ce --- /dev/null +++ b/include/asm-arm/arch-nomadik/gpio.h @@ -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__ */ |