diff options
Diffstat (limited to 'src/superio/fintek/f81216h/early_serial.c')
| -rw-r--r-- | src/superio/fintek/f81216h/early_serial.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/superio/fintek/f81216h/early_serial.c b/src/superio/fintek/f81216h/early_serial.c new file mode 100644 index 0000000000..6b667dfd74 --- /dev/null +++ b/src/superio/fintek/f81216h/early_serial.c @@ -0,0 +1,68 @@ +/* + * This file is part of the coreboot project. + * + * 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. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <arch/io.h> +#include <device/pnp.h> +#include <stdint.h> +#include "fintek.h" + +static u8 f81216h_entry_key; +#define FINTEK_EXIT_KEY 0xAA + +static void pnp_enter_conf_state(pnp_devfn_t dev) +{ + u16 port = dev >> 8; + outb(f81216h_entry_key, port); + outb(f81216h_entry_key, port); +} + +static void pnp_exit_conf_state(pnp_devfn_t dev) +{ + u16 port = dev >> 8; + outb(FINTEK_EXIT_KEY, port); +} + +/* Bring up early serial debugging output before the RAM is initialized. */ +void f81216h_enable_serial(pnp_devfn_t dev, u16 iobase, enum mode_key k) +{ + switch(k) { + MODE_6767: + f81216h_entry_key = 0x67; + break; + MODE_7777: + f81216h_entry_key = 0x77; + break; + MODE_8787: + f81216h_entry_key = 0x87; + break; + MODE_A0A0: + f81216h_entry_key = 0xa0; + break; + default: + f81216h_entry_key = 0x77; /* (safe to be hw default) */ + } + + pnp_enter_conf_state(dev); + pnp_set_logical_device(dev); + pnp_set_enable(dev, 0); + pnp_set_iobase(dev, PNP_IDX_IO0, iobase); + pnp_set_enable(dev, 1); + pnp_exit_conf_state(dev); +} |