summaryrefslogtreecommitdiff
path: root/src/pc80/keyboard.c
blob: 424920e71dedda3c35dfb19a0d0a1d9b38d2a881 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008 Advanced Micro Devices, Inc.
 * Copyright (C) ???? 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>

static int kbc_input_buffer_empty(void)
{
	u32 timeout;
	for(timeout = 1000000; timeout && (inb(0x64) & 0x02); timeout--) {
		inb(0x80);
	}

	if (!timeout) {
		printk_err("Unexpected Keyboard controller input buffer full\n");
	}
	return !!timeout;
}


static int kbc_output_buffer_full(void)
{
	u32 timeout;
	for(timeout = 1000000; timeout && ((inb(0x64) & 0x01) == 0); timeout--) {
		inb(0x80);
	}

	if (!timeout) {
		printk_err("Keyboard controller output buffer result timeout\n");
	}
	return !!timeout;
}


static int kbc_cleanup_buffers(void)
{
	u32 timeout;
	for(timeout = 1000000; timeout && (inb(0x64) & 0x03); timeout--) {
		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()) 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()) return;

	/* read self-test result, 0x55 is returned in the output buffer (0x60) */
	if ((regval = inb(0x60) != 0x55)) {
		printk_err("Keyboard Controller selftest 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 ((inb(0x64) & 0x01)) {
			regval = inb(0x60);
		}
		--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()) 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 ((inb(0x64) & 0x01)) {
			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()
{
	/* 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();
}