125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/*
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* Copyright (C) 2012 Alexey Galakhov
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* Copyright (C) 2012 Juergen Beisert, Pengutronix
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*
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* This codes bases partially on code from the Linux kernel:
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*
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* Copyright 2008 Openmoko, Inc.
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* Copyright 2008 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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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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#include <common.h>
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#include <errno.h>
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#include <io.h>
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#include <gpio.h>
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#include <mach/iomux.h>
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#include <mach/s3c-iomap.h>
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#define S3C_GPACON (S3C_GPIO_BASE)
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#define S3C_GPADAT (S3C_GPIO_BASE + 0x04)
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#define S3C_GPAPUD (S3C_GPIO_BASE + 0x08)
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static inline unsigned group_offset(unsigned group)
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{
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return group * 0x20;
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}
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void gpio_set_value(unsigned gpio, int value)
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{
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unsigned group = GET_GROUP(gpio);
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unsigned bit = GET_BIT(gpio);
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unsigned offset = group_offset(group);
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uint32_t reg;
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reg = readl(S3C_GPADAT + offset);
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reg &= ~(1 << bit);
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reg |= (!!value) << bit;
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writel(reg, S3C_GPADAT + offset);
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}
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int gpio_get_value(unsigned gpio)
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{
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unsigned group = GET_GROUP(gpio);
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unsigned bit = GET_BIT(gpio);
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unsigned offset = group_offset(group);
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uint32_t reg;
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/* value */
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reg = readl(S3C_GPADAT + offset);
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return !!(reg & (1 << bit));
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}
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int gpio_direction_input(unsigned gpio)
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{
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unsigned group = GET_GROUP(gpio);
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unsigned bit = GET_BIT(gpio);
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unsigned offset = group_offset(group);
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uint32_t reg;
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bit <<= 2;
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reg = readl(S3C_GPACON + offset) & ~(0xf << bit);
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writel(reg, S3C_GPACON + offset);
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return 0;
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}
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int gpio_direction_output(unsigned gpio, int value)
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{
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unsigned group = GET_GROUP(gpio);
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unsigned bit = GET_BIT(gpio);
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unsigned offset = group_offset(group);
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uint32_t reg;
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gpio_set_value(gpio, value);
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bit <<= 2;
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reg = readl(S3C_GPACON + offset) & ~(0xf << bit);
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reg |= 0x1 << bit;
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writel(reg, S3C_GPACON + offset);
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return 0;
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}
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/* 'gpio_mode' must be one of the 'GP?_*' macros */
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void s3c_gpio_mode(unsigned gpio_mode)
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{
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unsigned group = GET_GROUP(gpio_mode);
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unsigned bit = GET_BIT(gpio_mode);
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unsigned func = GET_FUNC(gpio_mode);
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unsigned offset = group_offset(group);
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unsigned reg;
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bit <<= 1;
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if (PUD_PRESENT(gpio_mode)) {
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reg = readl(S3C_GPAPUD + offset);
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reg &= ~(PUD_MASK << bit);
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reg |= GET_PUD(gpio_mode) << bit;
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writel(reg, S3C_GPAPUD + offset);
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}
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bit <<= 1;
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reg = readl(S3C_GPACON + offset) & ~(0xf << bit);
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writel(reg | (func << bit), S3C_GPACON + offset);
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if (func == 1) { /* output? if yes, also set the initial value */
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reg = readl(S3C_GPADAT + offset) & ~(1 << (bit >> 2));
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reg |= GET_GPIOVAL(gpio_mode) << (bit >> 2);
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writel(reg, S3C_GPADAT + offset);
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}
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}
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