| /* |
| * 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 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 |
| } |
| } |