diff options
Diffstat (limited to 'src/superio/ite/it8721f/early_serial.c')
| -rw-r--r-- | src/superio/ite/it8721f/early_serial.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/src/superio/ite/it8721f/early_serial.c b/src/superio/ite/it8721f/early_serial.c new file mode 100644 index 0000000000..cf17d0e5b9 --- /dev/null +++ b/src/superio/ite/it8721f/early_serial.c @@ -0,0 +1,93 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de> + * Copyright (C) 2011 QingPei Wang <wangqingpei@gmail.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/romcc_io.h> +#include "it8721f.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 IT8721F_CONFIG_REG_CC 0x02 /* Configure Control (write-only). */ +#define IT8721F_CONFIG_REG_LDN 0x07 /* Logical Device Number. */ +#define IT8721F_CONFIG_REG_CLOCKSEL 0x23 /* Clock Selection. */ +#define IT8721F_CONFIG_REG_SWSUSP 0x24 /* Software Suspend, Flash I/F. */ + +static void it8721f_sio_write(u8 ldn, u8 index, u8 value) +{ + outb(IT8721F_CONFIG_REG_LDN, SIO_BASE); + outb(ldn, SIO_DATA); + outb(index, SIO_BASE); + outb(value, SIO_DATA); +} + +static void it8721f_enter_conf(void) +{ + u16 port = 0x2e; /* TODO: Don't hardcode! */ + + outb(0x87, port); + outb(0x01, port); + outb(0x55, port); + outb((port == 0x4e) ? 0xaa : 0x55, port); +} + +static void it8721f_exit_conf(void) +{ + it8721f_sio_write(0x00, IT8721F_CONFIG_REG_CC, 0x02); +} + +/* Select 24MHz CLKIN (48MHz default). */ +void it8721f_24mhz_clkin(void) +{ + it8721f_enter_conf(); + it8721f_sio_write(0x00, IT8721F_CONFIG_REG_CLOCKSEL, 0x1); + it8721f_exit_conf(); +} + + +/* Enable the serial port(s). */ +void it8721f_enable_serial(device_t dev, u16 iobase) +{ + /* (1) Enter the configuration state (MB PnP mode). */ + it8721f_enter_conf(); + + /* (2) Modify the data of configuration registers. */ + + /* + * Select the chip to configure (if there's more than one). + * Set bit 7 to select JP3=1, clear bit 7 to select JP3=0. + * If this register is not written, both chips are configured. + */ + + /* it8718f_sio_write(0x00, IT8718F_CONFIG_REG_CONFIGSEL, 0x00); */ + + /* Enable serial port(s). */ + it8721f_sio_write(IT8721F_SP1, 0x30, 0x1); /* Serial port 1 */ + it8721f_sio_write(IT8721F_SP2, 0x30, 0x1); /* Serial port 2 */ + + /* Clear software suspend mode (clear bit 0). TODO: Needed? */ + /* it8718f_sio_write(0x00, IT8718F_CONFIG_REG_SWSUSP, 0x00); */ + + /* (3) Exit the configuration state (MB PnP mode). */ + it8721f_exit_conf(); +} |