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/*
* (C) Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering
*
* 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
*/
#include <common.h>
#include <asm/io.h>
#include "vct.h"
/*
* Find out to which of the 2 gpio modules the pin specified in the
* argument belongs:
* GPIO_MODULE yields 0 for pins 0 to 31,
* 1 for pins 32 to 63
*/
#define GPIO_MODULE(pin) ((pin) >> 5)
/*
* Bit position within a 32-bit peripheral register (where every
* bit is one bitslice)
*/
#define MASK(pin) (1 << ((pin) & 0x1F))
#define BASE_ADDR(mod) module_base[mod]
/*
* Lookup table for transforming gpio module number 0 to 2 to
* address offsets
*/
static u32 module_base[] = {
GPIO1_BASE,
GPIO2_BASE
};
static void clrsetbits(u32 addr, u32 and_mask, u32 or_mask)
{
reg_write(addr, (reg_read(addr) & ~and_mask) | or_mask);
}
int vct_gpio_dir(int pin, int dir)
{
u32 gpio_base;
gpio_base = BASE_ADDR(GPIO_MODULE(pin));
if (dir == 0)
clrsetbits(GPIO_SWPORTA_DDR(gpio_base), MASK(pin), 0);
else
clrsetbits(GPIO_SWPORTA_DDR(gpio_base), 0, MASK(pin));
return 0;
}
void vct_gpio_set(int pin, int val)
{
u32 gpio_base;
gpio_base = BASE_ADDR(GPIO_MODULE(pin));
if (val == 0)
clrsetbits(GPIO_SWPORTA_DR(gpio_base), MASK(pin), 0);
else
clrsetbits(GPIO_SWPORTA_DR(gpio_base), 0, MASK(pin));
}
int vct_gpio_get(int pin)
{
u32 gpio_base;
u32 value;
gpio_base = BASE_ADDR(GPIO_MODULE(pin));
value = reg_read(GPIO_EXT_PORTA(gpio_base));
return ((value & MASK(pin)) ? 1 : 0);
}
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