| /* |
| * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de> |
| * |
| * 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 "it8671f.h" |
| |
| /* The base address is 0x3f0, 0x3bd, or 0x370, depending on config bytes. */ |
| #define SIO_BASE 0x3f0 |
| #define SIO_INDEX SIO_BASE |
| #define SIO_DATA SIO_BASE+1 |
| |
| /* TODO: These values are actually from the IT8673F datasheet; check if |
| they're also valid for the IT8671F. */ |
| #define IT8671F_CONFIG_REG_CC 0x02 /* Configure Control. */ |
| #define IT8671F_CONFIG_REG_LDN 0x07 /* Logical Device Number. */ |
| #define IT8671F_CONFIG_REG_CLOCKSEL 0x23 /* Clock Selection. */ |
| #define IT8671F_CONFIG_REG_SWSUSP 0x24 /* Software Suspend. */ |
| |
| #define IT8671F_ADDRESS_PORT 0x279 |
| |
| /* Special values used for entering MB PnP mode. The first four bytes of |
| * each line determine the address port, the last four are data. */ |
| static const uint8_t init_values[] = { |
| 0x6a, 0xb5, 0xda, 0xed, /**/ 0xf6, 0xfb, 0x7d, 0xbe, |
| 0xdf, 0x6f, 0x37, 0x1b, /**/ 0x0d, 0x86, 0xc3, 0x61, |
| 0xb0, 0x58, 0x2c, 0x16, /**/ 0x8b, 0x45, 0xa2, 0xd1, |
| 0xe8, 0x74, 0x3a, 0x9d, /**/ 0xce, 0xe7, 0x73, 0x39, |
| }; |
| |
| /* The content of IT8671F_CONFIG_REG_LDN (index 07h) must be set to the |
| * LDN the register belongs to, before you can access the register. */ |
| static void it8671f_sio_write(uint8_t ldn, uint8_t index, uint8_t value) |
| { |
| outb(IT8671F_CONFIG_REG_LDN, SIO_BASE); |
| outb(ldn, SIO_DATA); |
| outb(index, SIO_BASE); |
| outb(value, SIO_DATA); |
| } |
| |
| /* Enable the peripheral devices on the IT8671F Super IO chip. */ |
| static void it8671f_enable_serial(device_t dev, unsigned iobase) |
| { |
| uint8_t i; |
| |
| /* (1) Enter the configuration state (MB PnP mode). */ |
| |
| /* Perform MB PnP setup to put the SIO chip at 0x3f0. */ |
| /* Base address 0x3f0: 0x86 0x80 0x55 0x55. */ |
| /* Base address 0x3bd: 0x86 0x80 0x55 0xaa. */ |
| /* Base address 0x370: 0x86 0x80 0xaa 0x55. */ |
| outb(0x86, IT8671F_ADDRESS_PORT); |
| outb(0x80, IT8671F_ADDRESS_PORT); |
| outb(0x55, IT8671F_ADDRESS_PORT); |
| outb(0x55, IT8671F_ADDRESS_PORT); |
| |
| /* Sequentially write the 32 special values. */ |
| for (i = 0; i < 32; i++) { |
| outb(init_values[i], SIO_BASE); |
| } |
| |
| /* (2) Modify the data of configuration registers. */ |
| |
| /* Enable parallel port, serial port 1, serial port 2, floppy. */ |
| it8671f_sio_write(0x00, 0x23, 0x0f); |
| |
| /* Activate serial port 1 and 2. */ |
| it8671f_sio_write(0x01, 0x30, 0x1); |
| it8671f_sio_write(0x02, 0x30, 0x1); |
| |
| /* Select 24MHz CLKIN and clear software suspend mode. */ |
| it8671f_sio_write(0x00, IT8671F_CONFIG_REG_SWSUSP, 0x00); |
| |
| /* (3) Exit the configuration state (MB PnP mode). */ |
| it8671f_sio_write(0x00, IT8671F_CONFIG_REG_CC, 0x02); |
| } |
| |