diff options
author | Ajay Bhargav <[ajay.bhargav@einfochips.com]> | 2011-08-22 17:57:38 +0530 |
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committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2011-09-30 22:00:52 +0200 |
commit | 0c44229859e613bd0267928d6005f59c3a6080d6 (patch) | |
tree | 3ee6abcae0c03038c7563493c349bb1f21432cb5 /drivers/gpio/mvgpio.c | |
parent | 1d5e7fb403257d62f0f2419cb83fdf6b0f02f215 (diff) |
gpio: Add GPIO driver framework for Marvell SoCs
This patch adds generic GPIO driver framework support for Marvell SoCs.
To enable GPIO driver define CONFIG_MARVELL_GPIO and for GPIO commands
define CONFIG_CMD_GPIO in your board configuration file.
Signed-off-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
Diffstat (limited to 'drivers/gpio/mvgpio.c')
-rw-r--r-- | drivers/gpio/mvgpio.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/gpio/mvgpio.c b/drivers/gpio/mvgpio.c new file mode 100644 index 00000000000..276f206ccd5 --- /dev/null +++ b/drivers/gpio/mvgpio.c @@ -0,0 +1,115 @@ +/* + * (C) Copyright 2011 + * eInfochips Ltd. <www.einfochips.com> + * Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com> + * + * (C) Copyright 2010 + * Marvell Semiconductor <www.marvell.com> + * + * 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., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301 USA + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/errno.h> +#include "mvgpio.h" +#include <asm/gpio.h> + +#ifndef MV_MAX_GPIO +#define MV_MAX_GPIO 128 +#endif + +int gpio_request(int gp, const char *label) +{ + if (gp >= MV_MAX_GPIO) { + printf("%s: Invalid GPIO requested %d\n", __func__, gp); + return -EINVAL; + } + return 0; +} + +void gpio_free(int gp) +{ +} + +void gpio_toggle_value(int gp) +{ + gpio_set_value(gp, !gpio_get_value(gp)); +} + +int gpio_direction_input(int gp) +{ + struct gpio_reg *gpio_reg_bank; + + if (gp >= MV_MAX_GPIO) { + printf("%s: Invalid GPIO %d\n", __func__, gp); + return -EINVAL; + } + + gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp)); + writel(GPIO_TO_BIT(gp), &gpio_reg_bank->gcdr); + return 0; +} + +int gpio_direction_output(int gp, int value) +{ + struct gpio_reg *gpio_reg_bank; + + if (gp >= MV_MAX_GPIO) { + printf("%s: Invalid GPIO %d\n", __func__, gp); + return -EINVAL; + } + + gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp)); + writel(GPIO_TO_BIT(gp), &gpio_reg_bank->gsdr); + gpio_set_value(gp, value); + return 0; +} + +int gpio_get_value(int gp) +{ + struct gpio_reg *gpio_reg_bank; + u32 gp_val; + + if (gp >= MV_MAX_GPIO) { + printf("%s: Invalid GPIO %d\n", __func__, gp); + return -EINVAL; + } + + gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp)); + gp_val = readl(&gpio_reg_bank->gplr); + + return GPIO_VAL(gp, gp_val); +} + +void gpio_set_value(int gp, int value) +{ + struct gpio_reg *gpio_reg_bank; + + if (gp >= MV_MAX_GPIO) { + printf("%s: Invalid GPIO %d\n", __func__, gp); + return; + } + + gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp)); + if (value) + writel(GPIO_TO_BIT(gp), &gpio_reg_bank->gpsr); + else + writel(GPIO_TO_BIT(gp), &gpio_reg_bank->gpcr); +} |