diff options
Diffstat (limited to 'src/superio/ite/it8716f/early_serial.c')
-rw-r--r-- | src/superio/ite/it8716f/early_serial.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/superio/ite/it8716f/early_serial.c b/src/superio/ite/it8716f/early_serial.c new file mode 100644 index 0000000000..747ca3074e --- /dev/null +++ b/src/superio/ite/it8716f/early_serial.c @@ -0,0 +1,62 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de> + * + * Copyright (C) 2007 AMD + * Written by Yinghai Lu <yinghai.lu@amd.com> for AMD. + * + * 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/romcc_io.h> +#include "it8716f.h" + +/* The base address is 0x2e or 0x4e, depending on config bytes. */ +#define SIO_BASE 0x2e +#define SIO_INDEX SIO_BASE +#define SIO_DATA (SIO_BASE + 1) + +/* Global configuration registers. */ +#define IT8716F_CONFIG_REG_CC 0x02 /* Configure Control (write-only). */ +#define IT8716F_CONFIG_REG_LDN 0x07 /* Logical Device Number. */ +#define IT8716F_CONFIG_REG_CONFIGSEL 0x22 /* Configuration Select. */ +#define IT8716F_CONFIG_REG_CLOCKSEL 0x23 /* Clock Selection. */ +#define IT8716F_CONFIG_REG_SWSUSP 0x24 /* Software Suspend, Flash I/F. */ + +static void pnp_enter_ext_func_mode(device_t dev) +{ + u16 port = dev >> 8; + + outb(0x87, port); + outb(0x01, port); + outb(0x55, port); + outb((port == 0x4e) ? 0xaa : 0x55, port); +} + +static void pnp_exit_ext_func_mode(device_t dev) +{ + pnp_write_config(dev, IT8716F_CONFIG_REG_CC, 0x02); +} + +void it8716f_enable_serial(device_t dev, u16 iobase) +{ + pnp_enter_ext_func_mode(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_ext_func_mode(dev); +} |