| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2009 One Laptop per Child, Association, Inc. |
| * |
| * 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; version 2 of the License. |
| * |
| * 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 |
| */ |
| |
| /* |
| * Enable the serial devices on the VIA |
| */ |
| #include <arch/io.h> |
| |
| /* The base address is 0x15c, 0x2e, depending on config bytes */ |
| |
| #define SIO_BASE 0x3f0 |
| #define SIO_DATA SIO_BASE+1 |
| |
| static void vx800_writepnpaddr(uint8_t val) |
| { |
| outb(val, 0x2e); |
| outb(val, 0xeb); |
| } |
| |
| static void vx800_writepnpdata(uint8_t val) |
| { |
| outb(val, 0x2f); |
| outb(val, 0xeb); |
| } |
| |
| static void vx800_writesiobyte(uint16_t reg, uint8_t val) |
| { |
| outb(val, reg); |
| } |
| |
| static void vx800_writesioword(uint16_t reg, uint16_t val) |
| { |
| outw(val, reg); |
| } |
| |
| /* regs we use: 85, and the southbridge devfn is defined by the |
| mainboard |
| */ |
| |
| void enable_vx800_serial(void) |
| { |
| post_code(0x06); |
| outb(0x03, 0x22); |
| |
| //pci_write_config8(PCI_DEV(0,17,0),0xb4,0x7e); |
| //pci_write_config8(PCI_DEV(0,17,0),0xb0,0x10); |
| |
| // turn on pnp |
| vx800_writepnpaddr(0x87); |
| vx800_writepnpaddr(0x87); |
| // now go ahead and set up com1. |
| // set address |
| vx800_writepnpaddr(0x7); |
| vx800_writepnpdata(0x2); |
| // enable serial out |
| vx800_writepnpaddr(0x30); |
| vx800_writepnpdata(0x1); |
| // serial port 1 base address (FEh) |
| vx800_writepnpaddr(0x60); |
| vx800_writepnpdata(0xfe); |
| // serial port 1 IRQ (04h) |
| vx800_writepnpaddr(0x70); |
| vx800_writepnpdata(0x4); |
| // serial port 1 control |
| vx800_writepnpaddr(0xf0); |
| vx800_writepnpdata(0x2); |
| // turn of pnp |
| vx800_writepnpaddr(0xaa); |
| |
| // set up reg to set baud rate. |
| vx800_writesiobyte(0x3fb, 0x80); |
| // Set 115 kb |
| vx800_writesioword(0x3f8, 1); |
| // Set 9.6 kb |
| // WRITESIOWORD(0x3f8, 12) |
| // now set no parity, one stop, 8 bits |
| vx800_writesiobyte(0x3fb, 3); |
| // now turn on RTS, DRT |
| vx800_writesiobyte(0x3fc, 3); |
| // Enable interrupts |
| vx800_writesiobyte(0x3f9, 0xf); |
| // should be done. Dump a char for fun. |
| vx800_writesiobyte(0x3f8, 48); |
| post_code(0x07); |
| } |