Stefan Reinauer | 6626d6a | 2012-03-30 15:10:07 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2012 The ChromiumOS Authors. All rights reserved. |
| 5 | * |
| 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; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
Stefan Reinauer | 6626d6a | 2012-03-30 15:10:07 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
Marc Jones | 04134a5 | 2013-10-30 16:18:07 -0600 | [diff] [blame] | 16 | #include <stdint.h> |
| 17 | #include <arch/io.h> |
| 18 | #include "chip.h" |
Stefan Reinauer | 6626d6a | 2012-03-30 15:10:07 -0700 | [diff] [blame] | 19 | |
Marc Jones | 04134a5 | 2013-10-30 16:18:07 -0600 | [diff] [blame] | 20 | void sio1007_setreg(u16 lpc_port, u8 reg, u8 value, u8 mask) |
Stefan Reinauer | 6626d6a | 2012-03-30 15:10:07 -0700 | [diff] [blame] | 21 | { |
| 22 | u8 reg_value; |
| 23 | |
| 24 | outb(reg, lpc_port); |
| 25 | reg_value = inb(lpc_port + 1); |
| 26 | reg_value &= ~mask; |
| 27 | reg_value |= (value & mask); |
| 28 | outb(reg_value, lpc_port + 1); |
| 29 | } |
| 30 | |
Marc Jones | 04134a5 | 2013-10-30 16:18:07 -0600 | [diff] [blame] | 31 | int sio1007_enable_uart_at(u16 port) |
Stefan Reinauer | 6626d6a | 2012-03-30 15:10:07 -0700 | [diff] [blame] | 32 | { |
| 33 | /* Enable config mode. */ |
| 34 | outb(0x55, port); |
| 35 | if (inb(port) != 0x55) |
| 36 | return 0; /* There is no LPC device at this address. */ |
| 37 | |
| 38 | /* Registers 12 and 13 hold config address, look for a match. */ |
| 39 | outb(0x12, port); |
| 40 | if (inb(port + 1) != (port & 0xff)) |
| 41 | return 0; |
| 42 | |
| 43 | outb(0x13, port); |
| 44 | if (inb(port + 1) != (port >> 8)) |
| 45 | return 0; |
| 46 | |
| 47 | /* This must be the sio1007, enable the UART. */ |
| 48 | /* turn on power */ |
| 49 | sio1007_setreg(port, 0x2, 1 << 3, 1 << 3); |
| 50 | /* enable high speed */ |
| 51 | sio1007_setreg(port, 0xc, 1 << 6, 1 << 6); |
| 52 | /* set the base address */ |
| 53 | sio1007_setreg(port, 0x24, CONFIG_TTYS0_BASE >> 2, 0xff); |
| 54 | |
| 55 | /* Disable config mode. */ |
| 56 | outb(0xaa, port); |
| 57 | return 1; |
| 58 | } |