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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
* Copyright (C) 2014 Edward O'Callaghan <eocallaghan@alterapraxis.com>
*
* 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.
*/
#include <pc80/mc146818rtc.h>
#include <superio/winbond/common/winbond.h>
#include <superio/winbond/w83627thg/w83627thg.h>
#define GPIO_DEV PNP_DEV(0x2e, W83627THG_GPIO3)
#define WINBOND_ENTRY_KEY 0x87
#define WINBOND_EXIT_KEY 0xAA
/* Enable configuration: pass entry key '0x87' into index port dev. */
static void pnp_enter_conf_state(pnp_devfn_t dev)
{
u16 port = dev >> 8;
outb(WINBOND_ENTRY_KEY, port);
outb(WINBOND_ENTRY_KEY, port);
}
/* Disable configuration: pass exit key '0xAA' into index port dev. */
static void pnp_exit_conf_state(pnp_devfn_t dev)
{
u16 port = dev >> 8;
outb(WINBOND_EXIT_KEY, port);
}
uint8_t bootblock_read_recovery_jumper(pnp_devfn_t dev)
{
uint8_t recovery_enabled = 0;
pnp_enter_conf_state(dev);
pnp_set_logical_device(dev);
pnp_set_enable(dev, 1); /* Enable GPIO3 */
pnp_write_config(dev, 0xf0, 0xff); /* Set GPIO3 to input */
recovery_enabled = !(pnp_read_config(dev, 0xf1) & 0x08); /* Read GP33 */
pnp_exit_conf_state(dev);
return recovery_enabled;
}
void bootblock_mainboard_init(void)
{
uint8_t recovery_enabled;
unsigned char addr;
unsigned char byte;
recovery_enabled = bootblock_read_recovery_jumper(GPIO_DEV);
if (recovery_enabled) {
#if IS_ENABLED(CONFIG_USE_OPTION_TABLE)
/* Clear NVRAM checksum */
for (addr = LB_CKS_RANGE_START; addr <= LB_CKS_RANGE_END; addr++) {
cmos_write(0x0, addr);
}
/* Set fallback boot */
byte = cmos_read(RTC_BOOT_BYTE);
byte &= 0xfc;
cmos_write(byte, RTC_BOOT_BYTE);
#else
/* FIXME
* Figure out how to recover if the option table is not available
*/
#endif
}
}
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