diff options
Diffstat (limited to 'arch/arm/cpu/armv7/omap-common/gpio.c')
| -rw-r--r-- | arch/arm/cpu/armv7/omap-common/gpio.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/omap-common/gpio.c b/arch/arm/cpu/armv7/omap-common/gpio.c new file mode 100644 index 000000000..f4c347941 --- /dev/null +++ b/arch/arm/cpu/armv7/omap-common/gpio.c @@ -0,0 +1,176 @@ +/* + * Copyright (c) 2009 Wind River Systems, Inc. + * Tom Rix <Tom.Rix@windriver.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 + * + * This work is derived from the linux 2.6.27 kernel source + * To fetch, use the kernel repository + * git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + * Use the v2.6.27 tag. + * + * Below is the original's header including its copyright + * + * linux/arch/arm/plat-omap/gpio.c + * + * Support functions for OMAP GPIO + * + * Copyright (C) 2003-2005 Nokia Corporation + * Written by Juha Yrjölä <juha.yrjola@nokia.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <common.h> +#include <asm/omap_gpio.h> +#include <asm/io.h> +#include <asm/errno.h> + +static inline const struct gpio_bank *get_gpio_bank(int gpio) +{ + return &omap_gpio_bank[gpio >> 5]; +} + +static inline int get_gpio_index(int gpio) +{ + return gpio & 0x1f; +} + +static inline int gpio_valid(int gpio) +{ + if (gpio < 0) + return -1; + if (gpio < 192) + return 0; + return -1; +} + +static int check_gpio(int gpio) +{ + if (gpio_valid(gpio) < 0) { + printf("ERROR : check_gpio: invalid GPIO %d\n", gpio); + return -1; + } + return 0; +} + +static void _set_gpio_direction(const struct gpio_bank *bank, int gpio, + int is_input) +{ + void *reg = bank->base; + u32 l; + + switch (bank->method) { + case METHOD_GPIO_24XX: + reg += OMAP_GPIO_OE; + break; + default: + return; + } + l = __raw_readl(reg); + if (is_input) + l |= 1 << gpio; + else + l &= ~(1 << gpio); + __raw_writel(l, reg); +} + +void omap_set_gpio_direction(int gpio, int is_input) +{ + const struct gpio_bank *bank; + + if (check_gpio(gpio) < 0) + return; + bank = get_gpio_bank(gpio); + _set_gpio_direction(bank, get_gpio_index(gpio), is_input); +} + +static void _set_gpio_dataout(const struct gpio_bank *bank, int gpio, + int enable) +{ + void *reg = bank->base; + u32 l = 0; + + switch (bank->method) { + case METHOD_GPIO_24XX: + if (enable) + reg += OMAP_GPIO_SETDATAOUT; + else + reg += OMAP_GPIO_CLEARDATAOUT; + l = 1 << gpio; + break; + default: + printf("omap3-gpio unknown bank method %s %d\n", + __FILE__, __LINE__); + return; + } + __raw_writel(l, reg); +} + +void omap_set_gpio_dataout(int gpio, int enable) +{ + const struct gpio_bank *bank; + + if (check_gpio(gpio) < 0) + return; + bank = get_gpio_bank(gpio); + _set_gpio_dataout(bank, get_gpio_index(gpio), enable); +} + +int omap_get_gpio_datain(int gpio) +{ + const struct gpio_bank *bank; + void *reg; + + if (check_gpio(gpio) < 0) + return -EINVAL; + bank = get_gpio_bank(gpio); + reg = bank->base; + switch (bank->method) { + case METHOD_GPIO_24XX: + reg += OMAP_GPIO_DATAIN; + break; + default: + return -EINVAL; + } + return (__raw_readl(reg) + & (1 << get_gpio_index(gpio))) != 0; +} + +static void _reset_gpio(const struct gpio_bank *bank, int gpio) +{ + _set_gpio_direction(bank, get_gpio_index(gpio), 1); +} + +int omap_request_gpio(int gpio) +{ + if (check_gpio(gpio) < 0) + return -EINVAL; + + return 0; +} + +void omap_free_gpio(int gpio) +{ + const struct gpio_bank *bank; + + if (check_gpio(gpio) < 0) + return; + bank = get_gpio_bank(gpio); + + _reset_gpio(bank, gpio); +} |