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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Sage Electronic Engineering, LLC
*
* 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; version 2 of the License.
*
* 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.
*/
#include <stdint.h>
#include <device/mmio.h>
#include <FchPlatform.h>
#include "gpio_ftns.h"
void configure_gpio(u32 iomux_gpio, u8 iomux_ftn, u32 gpio, u32 setting)
{
u32 bdata;
bdata = read32((const volatile void *)(ACPI_MMIO_BASE + GPIO_OFFSET
+ gpio));
/* out the data value to prevent glitches */
bdata |= (setting & GPIO_OUTPUT_ENABLE);
write32((volatile void *)(ACPI_MMIO_BASE + GPIO_OFFSET + gpio), bdata);
/* set direction and data value */
bdata |= (setting & (GPIO_OUTPUT_ENABLE | GPIO_OUTPUT_VALUE
| GPIO_PULL_UP_ENABLE | GPIO_PULL_DOWN_ENABLE));
write32((volatile void *)(ACPI_MMIO_BASE + GPIO_OFFSET + gpio), bdata);
write8((volatile void *)(ACPI_MMIO_BASE + IOMUX_OFFSET + iomux_gpio),
iomux_ftn & 0x3);
}
u8 read_gpio(u32 gpio)
{
u32 status = read32((const volatile void *)(ACPI_MMIO_BASE + GPIO_OFFSET
+ gpio));
return (status & GPIO_PIN_STS) ? 1 : 0;
}
void write_gpio(u32 gpio, u8 value)
{
u32 status = read32((const volatile void *)(ACPI_MMIO_BASE + GPIO_OFFSET
+ gpio));
status &= ~GPIO_OUTPUT_VALUE;
status |= (value > 0) ? GPIO_OUTPUT_VALUE : 0;
write32((volatile void *)(ACPI_MMIO_BASE + GPIO_OFFSET + gpio), status);
}
int get_spd_offset(void)
{
u8 index = 0;
/* One SPD file contains all 4 options, determine which index to
* read here, then call into the standard routines.
*/
u8 *gpio_bank0_ptr = (u8 *)(ACPI_MMIO_BASE + GPIO_BANK0_BASE);
if (*(gpio_bank0_ptr + (0x40 << 2) + 2) & BIT0) index |= BIT0;
if (*(gpio_bank0_ptr + (0x41 << 2) + 2) & BIT0) index |= BIT1;
return index;
}
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