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dcee1ab320
Add gpio_is_valid() to omap_gpio API Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il> Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
239 lines
4.8 KiB
C
239 lines
4.8 KiB
C
/*
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* Copyright (c) 2009 Wind River Systems, Inc.
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* Tom Rix <Tom.Rix@windriver.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* This work is derived from the linux 2.6.27 kernel source
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* To fetch, use the kernel repository
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* git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
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* Use the v2.6.27 tag.
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*
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* Below is the original's header including its copyright
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*
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* linux/arch/arm/plat-omap/gpio.c
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*
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* Support functions for OMAP GPIO
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*
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* Copyright (C) 2003-2005 Nokia Corporation
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* Written by Juha Yrjölä <juha.yrjola@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <common.h>
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#include <asm/gpio.h>
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#include <asm/io.h>
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#include <asm/errno.h>
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#define OMAP_GPIO_DIR_OUT 0
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#define OMAP_GPIO_DIR_IN 1
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static inline const struct gpio_bank *get_gpio_bank(int gpio)
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{
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return &omap_gpio_bank[gpio >> 5];
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}
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static inline int get_gpio_index(int gpio)
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{
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return gpio & 0x1f;
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}
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int gpio_is_valid(int gpio)
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{
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return (gpio >= 0) && (gpio < 192);
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}
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static int check_gpio(int gpio)
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{
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if (!gpio_is_valid(gpio)) {
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printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
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return -1;
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}
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return 0;
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}
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static void _set_gpio_direction(const struct gpio_bank *bank, int gpio,
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int is_input)
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{
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void *reg = bank->base;
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u32 l;
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switch (bank->method) {
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case METHOD_GPIO_24XX:
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reg += OMAP_GPIO_OE;
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break;
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default:
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return;
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}
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l = __raw_readl(reg);
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if (is_input)
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l |= 1 << gpio;
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else
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l &= ~(1 << gpio);
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__raw_writel(l, reg);
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}
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/**
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* Get the direction of the GPIO by reading the GPIO_OE register
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* corresponding to the specified bank.
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*/
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static int _get_gpio_direction(const struct gpio_bank *bank, int gpio)
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{
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void *reg = bank->base;
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u32 v;
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switch (bank->method) {
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case METHOD_GPIO_24XX:
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reg += OMAP_GPIO_OE;
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break;
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default:
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return -1;
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}
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v = __raw_readl(reg);
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if (v & (1 << gpio))
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return OMAP_GPIO_DIR_IN;
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else
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return OMAP_GPIO_DIR_OUT;
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}
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static void _set_gpio_dataout(const struct gpio_bank *bank, int gpio,
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int enable)
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{
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void *reg = bank->base;
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u32 l = 0;
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switch (bank->method) {
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case METHOD_GPIO_24XX:
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if (enable)
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reg += OMAP_GPIO_SETDATAOUT;
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else
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reg += OMAP_GPIO_CLEARDATAOUT;
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l = 1 << gpio;
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break;
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default:
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printf("omap3-gpio unknown bank method %s %d\n",
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__FILE__, __LINE__);
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return;
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}
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__raw_writel(l, reg);
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}
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/**
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* Set value of the specified gpio
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*/
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int gpio_set_value(unsigned gpio, int value)
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{
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const struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return -1;
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bank = get_gpio_bank(gpio);
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_set_gpio_dataout(bank, get_gpio_index(gpio), value);
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return 0;
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}
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/**
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* Get value of the specified gpio
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*/
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int gpio_get_value(unsigned gpio)
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{
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const struct gpio_bank *bank;
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void *reg;
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int input;
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if (check_gpio(gpio) < 0)
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return -1;
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bank = get_gpio_bank(gpio);
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reg = bank->base;
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switch (bank->method) {
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case METHOD_GPIO_24XX:
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input = _get_gpio_direction(bank, get_gpio_index(gpio));
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switch (input) {
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case OMAP_GPIO_DIR_IN:
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reg += OMAP_GPIO_DATAIN;
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break;
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case OMAP_GPIO_DIR_OUT:
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reg += OMAP_GPIO_DATAOUT;
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break;
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default:
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return -1;
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}
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break;
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default:
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return -1;
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}
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return (__raw_readl(reg)
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& (1 << get_gpio_index(gpio))) != 0;
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}
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/**
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* Set gpio direction as input
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*/
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int gpio_direction_input(unsigned gpio)
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{
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const struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return -1;
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bank = get_gpio_bank(gpio);
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_set_gpio_direction(bank, get_gpio_index(gpio), 1);
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return 0;
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}
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/**
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* Set gpio direction as output
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*/
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int gpio_direction_output(unsigned gpio, int value)
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{
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const struct gpio_bank *bank;
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if (check_gpio(gpio) < 0)
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return -1;
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bank = get_gpio_bank(gpio);
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_set_gpio_dataout(bank, get_gpio_index(gpio), value);
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_set_gpio_direction(bank, get_gpio_index(gpio), 0);
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return 0;
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}
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/**
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* Request a gpio before using it.
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*
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* NOTE: Argument 'label' is unused.
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*/
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int gpio_request(unsigned gpio, const char *label)
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{
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if (check_gpio(gpio) < 0)
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return -1;
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return 0;
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}
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/**
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* Reset and free the gpio after using it.
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*/
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int gpio_free(unsigned gpio)
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{
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return 0;
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}
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