diff options
author | Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org> | 2011-05-09 18:04:49 -0300 |
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committer | John Rigby <john.rigby@linaro.org> | 2011-06-28 15:57:51 +0100 |
commit | 4ddc2b61cfd06e3d0ecd68094ab9bbff1902f041 (patch) | |
tree | 4c32f8e11680f8fe37e8767c3300223e6150a973 /arch/arm/cpu/armv7/omap4/gpio.c | |
parent | 89fbb59dc51efa8b94d838ef8627f74b2ff18b13 (diff) |
omap4: add support for gpios
Copied from omap3.
Signed-off-by: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Diffstat (limited to 'arch/arm/cpu/armv7/omap4/gpio.c')
-rw-r--r-- | arch/arm/cpu/armv7/omap4/gpio.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/omap4/gpio.c b/arch/arm/cpu/armv7/omap4/gpio.c new file mode 100644 index 000000000..40f1d5e65 --- /dev/null +++ b/arch/arm/cpu/armv7/omap4/gpio.c @@ -0,0 +1,169 @@ +/* + * Lifted from arch/arm/cpu/armv7/omap3/gpio.c + * + * Original 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/arch/gpio.h> +#include <asm/io.h> +#include <asm/errno.h> + +/* + * OMAP44XX specific GPIO registers + */ +#define OMAP44XX_GPIO1_BASE 0x4a310000 +#define OMAP44XX_GPIO2_BASE 0x48055000 +#define OMAP44XX_GPIO3_BASE 0x48057000 +#define OMAP44XX_GPIO4_BASE 0x48059000 +#define OMAP44XX_GPIO5_BASE 0x4805B000 +#define OMAP44XX_GPIO6_BASE 0x4805D000 + +static const struct gpio_bank gpio_bank_44xx[6] = { + { (void *)OMAP44XX_GPIO1_BASE }, + { (void *)OMAP44XX_GPIO2_BASE }, + { (void *)OMAP44XX_GPIO3_BASE }, + { (void *)OMAP44XX_GPIO4_BASE }, + { (void *)OMAP44XX_GPIO5_BASE }, + { (void *)OMAP44XX_GPIO6_BASE }, +}; + +static struct gpio_bank *gpio_bank = &gpio_bank_44xx[0]; + +static inline struct gpio_bank *get_gpio_bank(int gpio) +{ + return &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(struct gpio_bank *bank, int gpio, int is_input) +{ + void *reg; + u32 l; + + reg = bank->base + OMAP4_GPIO_OE; + 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) +{ + 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(struct gpio_bank *bank, int gpio, int enable) +{ + if (enable) + __raw_writel(1 << gpio, bank->base + OMAP4_GPIO_SETDATAOUT); + else + __raw_writel(1 << gpio, bank->base + OMAP4_GPIO_CLEARDATAOUT); +} + +void omap_set_gpio_dataout(int gpio, int enable) +{ + 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) +{ + struct gpio_bank *bank; + + if (check_gpio(gpio) < 0) + return -EINVAL; + bank = get_gpio_bank(gpio); + return (__raw_readl(bank->base + OMAP4_GPIO_DATAIN) + & (1 << get_gpio_index(gpio))) != 0; +} + +static void _reset_gpio(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) +{ + struct gpio_bank *bank; + + if (check_gpio(gpio) < 0) + return; + bank = get_gpio_bank(gpio); + + _reset_gpio(bank, gpio); +} |