2 * This file is part of the coreboot project.
4 * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <arch/romcc_io.h>
24 /* The base address is 0x2e or 0x4e, depending on config bytes. */
26 #define SIO_INDEX SIO_BASE
27 #define SIO_DATA SIO_BASE+1
29 /* Global configuration registers. */
30 #define IT8712F_CONFIG_REG_CC 0x02 /* Configure Control (write-only). */
31 #define IT8712F_CONFIG_REG_LDN 0x07 /* Logical Device Number. */
32 #define IT8712F_CONFIG_REG_CONFIGSEL 0x22 /* Configuration Select. */
33 #define IT8712F_CONFIG_REG_CLOCKSEL 0x23 /* Clock Selection. */
34 #define IT8712F_CONFIG_REG_SWSUSP 0x24 /* Software Suspend, Flash I/F. */
35 #define IT8712F_CONFIG_REG_WATCHDOG 0x72 /* Watchdog control. */
37 #define IT8712F_CONFIGURATION_PORT 0x2e /* Write-only. */
39 /* The content of IT8712F_CONFIG_REG_LDN (index 0x07) must be set to the
40 LDN the register belongs to, before you can access the register. */
41 static void it8712f_sio_write(uint8_t ldn, uint8_t index, uint8_t value)
43 outb(IT8712F_CONFIG_REG_LDN, SIO_BASE);
45 outb(index, SIO_BASE);
46 outb(value, SIO_DATA);
50 static void it8712f_enter_conf(void)
52 /* Enter the configuration state (MB PnP mode). */
54 /* Perform MB PnP setup to put the SIO chip at 0x2e. */
55 /* Base address 0x2e: 0x87 0x01 0x55 0x55. */
56 /* Base address 0x4e: 0x87 0x01 0x55 0xaa. */
57 outb(0x87, IT8712F_CONFIGURATION_PORT);
58 outb(0x01, IT8712F_CONFIGURATION_PORT);
59 outb(0x55, IT8712F_CONFIGURATION_PORT);
60 outb(0x55, IT8712F_CONFIGURATION_PORT);
63 static void it8712f_exit_conf(void)
65 /* Exit the configuration state (MB PnP mode). */
66 it8712f_sio_write(0x00, IT8712F_CONFIG_REG_CC, 0x02);
70 static void it8712f_24mhz_clkin(void)
74 /* Select 24MHz CLKIN (48MHZ default)*/
75 it8712f_sio_write(0x00, IT8712F_CONFIG_REG_CLOCKSEL, 0x1);
81 static void it8712f_kill_watchdog(void)
85 /* Kill the Watchdog */
86 it8712f_sio_write(0x07, IT8712F_CONFIG_REG_WATCHDOG, 0x00);
91 /* Enable the peripheral devices on the IT8712F Super I/O chip. */
92 static void it8712f_enable_serial(device_t dev, unsigned iobase)
95 /* (1) Enter the configuration state (MB PnP mode). */
98 /* (2) Modify the data of configuration registers. */
100 /* Select the chip to configure (if there's more than one).
101 Set bit 7 to select JP3=1, clear bit 7 to select JP3=0.
102 If this register is not written, both chips are configured. */
103 /* it8712f_sio_write(0x00, IT8712F_CONFIG_REG_CONFIGSEL, 0x00); */
105 /* Enable serial port(s). */
106 it8712f_sio_write(IT8712F_SP1, 0x30, 0x1); /* Serial port 1 */
107 it8712f_sio_write(IT8712F_SP2, 0x30, 0x1); /* Serial port 2 */
109 /* Clear software suspend mode (clear bit 0). TODO: Needed? */
110 /* it8712f_sio_write(0x00, IT8712F_CONFIG_REG_SWSUSP, 0x00); */
112 /* (3) Exit the configuration state (MB PnP mode). */