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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2009 coresystems GmbH
* Copyright (C) 2008 Advanced Micro Devices, Inc.
* Copyright (C) 2003 Ollie Lo <ollielo@hotmail.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; 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
*/
#include <console/console.h>
#include <pc80/keyboard.h>
#include <device/device.h>
#include <arch/io.h>
#include <delay.h>
/* Wait 200ms for keyboard controller answers */
#define KBC_TIMEOUT_IN_MS 200
static int kbc_input_buffer_empty(void)
{
u32 timeout;
for(timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(0x64) & 0x02); timeout--) {
mdelay(1);
}
if (!timeout) {
printk_warning("Unexpected Keyboard controller input buffer full\n");
}
return !!timeout;
}
static int kbc_output_buffer_full(void)
{
u32 timeout;
for(timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(0x64) & 0x01) == 0); timeout--) {
mdelay(1);
}
if (!timeout) {
printk_warning("Keyboard controller output buffer result timeout\n");
}
return !!timeout;
}
static int kbc_cleanup_buffers(void)
{
u32 timeout;
for(timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(0x64) & 0x03); timeout--) {
mdelay(1);
inb(0x60);
}
if (!timeout) {
printk_err("Couldn't cleanup the keyboard controller buffers\n");
printk_err("0x64: 0x%x, 0x60: 0x%x\n", inb(0x64), inb(0x60));
}
return !!timeout;
}
static u8 send_keyboard(u8 command)
{
u8 regval = 0;
u8 resend = 10;
do {
if (!kbc_input_buffer_empty()) return 0;
outb(command, 0x60);
if (!kbc_output_buffer_full()) {
printk_err("Could not send keyboard command %02x\n",
command);
return 0;
}
regval = inb(0x60);
--resend;
} while (regval == 0xFE && resend > 0);
return regval;
}
static void pc_keyboard_init(struct pc_keyboard *keyboard)
{
u8 regval;
u8 resend;
printk_debug("Keyboard init...\n");
/* clean up any junk that might have been in the kbc */
if (!kbc_cleanup_buffers()) return;
/* reset/self test 8042 - send cmd 0xAA */
if (!kbc_input_buffer_empty()) return;
outb(0xAA, 0x64);
if (!kbc_output_buffer_full()) {
printk_err("Could not reset keyboard controller.\n");
return;
}
/* read self-test result, 0x55 is returned in the output buffer (0x60) */
if ((regval = inb(0x60) != 0x55)) {
printk_err("Keyboard Controller self-test failed: 0x%x\n", regval);
return;
}
/* Enable keyboard interface - No IRQ */
resend = 10;
regval = 0;
do {
if (!kbc_input_buffer_empty()) return;
outb(0x60, 0x64);
if (!kbc_input_buffer_empty()) return;
outb(0x20, 0x60); /* send cmd: enable keyboard */
if (kbc_output_buffer_full()) {
regval = inb(0x60);
} else {
printk_info("Timeout while enabling keyboard. (No keyboard present?)\n");
regval = inb(0x60); /* Better than 0 ? */
}
--resend;
} while (regval == 0xFE && resend > 0);
/* clean up any junk that might have been in the keyboard */
if (!kbc_cleanup_buffers()) return;
/* reset keyboard and self test (keyboard side) */
regval = send_keyboard(0xFF);
if (regval != 0xFA) {
printk_err("Keyboard selftest failed ACK: 0x%x\n", regval);
return;
}
if (!kbc_output_buffer_full()) {
printk_err("Timeout waiting for keyboard after reset.\n");
return;
}
regval = inb(0x60);
if (regval != 0xAA) {
printk_err("Keyboard selftest failed: 0x%x\n", regval);
return;
}
/*
* The following set scancode stuff is what normal BIOS do. It could be
* argued that coreboot shouldn't set the scan code.....
*/
/* disable the keyboard */
regval = send_keyboard(0xF5);
if (regval != 0xFA) {
printk_err("Keyboard disable failed ACK: 0x%x\n", regval);
return;
}
/* Set scancode command */
regval = send_keyboard(0xF0);
if (regval != 0xFA) {
printk_err("Keyboard set scancode cmd failed ACK: 0x%x\n", regval);
return;
}
/* Set scancode mode 2 */
regval = send_keyboard(0x02);
if (regval != 0xFA) {
printk_err("Keyboard set scancode mode failed ACK: 0x%x\n", regval);
return;
}
/* enable the keyboard */
regval = send_keyboard(0xF4);
if (regval != 0xFA) {
printk_err("Keyboard enable failed ACK: 0x%x\n", regval);
return;
}
/* All is well - enable keyboard interface */
resend = 10;
regval = 0;
do {
if (!kbc_input_buffer_empty()) return;
outb(0x60, 0x64);
if (!kbc_input_buffer_empty()) return;
outb(0x61, 0x60); /* send cmd: enable keyboard and IRQ 1 */
if (kbc_output_buffer_full()) {
regval = inb(0x60);
}
--resend;
} while (regval == 0xFE && resend > 0);
}
void init_pc_keyboard(unsigned port0, unsigned port1, struct pc_keyboard *kbd)
{
if ((port0 == 0x60) && (port1 == 0x64)) {
pc_keyboard_init(kbd);
}
}
/*
* Support PS/2 mode - oddball SIOs(KBC) need this setup
* Not well documented. Google - 0xcb keyboard controller
* This is called before pc_keyboard_init().
*/
void set_kbc_ps2_mode(void)
{
/* clean up any junk that might have been in the kbc */
if (!kbc_cleanup_buffers()) return;
/* reset/self test 8042 before we can do anything */
if (!kbc_input_buffer_empty()) return;
outb(0xAA, 0x64);
if (!kbc_output_buffer_full()) return;
/* read self-test result, 0x55 is returned in the output buffer (0x60) */
if ((inb(0x60) != 0x55)) {
printk_err("Keyboard Controller selftest failed\n");
return;
}
/* Support PS/2 mode */
if (!kbc_input_buffer_empty()) return;
outb(0xcb, 0x64);
if (!kbc_input_buffer_empty()) return;
outb(0x01, 0x60);
kbc_cleanup_buffers();
}
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