summaryrefslogtreecommitdiff
path: root/src/drivers/pc80/keyboard.c
blob: dd6321e13996370c13f827cc5674d077dede0510 (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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
/*
 * 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>
#if CONFIG_HAVE_ACPI_RESUME
#include <arch/acpi.h>
#endif

#define KBD_DATA	0x60
#define KBD_COMMAND	0x64
#define KBD_STATUS	0x64
#define KBD_IBF	(1 << 1)	// 1: input buffer full (data ready for ec)
#define KBD_OBF	(1 << 0)	// 1: output buffer full (data ready for host)

// Keyboard Controller Commands
#define KBC_CMD_READ_COMMAND	0x20	// Read command byte
#define KBC_CMD_WRITE_COMMAND	0x60	// Write command byte
#define KBC_CMD_SELF_TEST	0xAA	// Controller self-test
#define KBC_CMD_KBD_TEST	0xAB	// Keyboard Interface test

/* The Keyboard controller command byte
 *  BIT	| Description
 *  ----+-------------------------------------------------------
 *   7  | reserved, must be zero
 *   6  | XT Translation, (1 = on, 0 = off)
 *   5  | Disable Mouse Port (1 = disable, 0 = enable)
 *   4  | Disable Keyboard Port (1 = disable, 0 = enable)
 *   3  | reserved, must be zero
 *   2  | System Flag (1 = self-test passed. DO NOT SET TO ZERO)
 *   1  | Mouse Port Interrupts (1 = enable, 0 = disable)
 *   0  | Keyboard Port Interrupts (1 = enable, 0 = disable)
 */

// Keyboard Controller Replies
#define KBC_REPLY_SELFTEST_OK	0x55	// controller self-test succeeded

//
// Keyboard Replies
//
#define KBD_REPLY_POR		0xAA	// Power on reset
#define KBD_REPLY_ACK		0xFA	// Command ACK
#define KBD_REPLY_RESEND	0xFE	// Command NACK, send command again

/* Wait 400ms for keyboard controller answers */
#define KBC_TIMEOUT_IN_MS 400

static int kbc_input_buffer_empty(void)
{
	u32 timeout;
	for (timeout = KBC_TIMEOUT_IN_MS;
	     timeout && (inb(KBD_STATUS) & KBD_IBF); timeout--)
		mdelay(1);

	if (!timeout)
		printk(BIOS_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(KBD_STATUS) & KBD_OBF) == 0); timeout--)
		mdelay(1);

	if (!timeout)
		printk(BIOS_INFO,
		       "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(KBD_STATUS) & (KBD_OBF | KBD_IBF)); timeout--) {
		mdelay(1);
		inb(KBD_DATA);
	}

	if (!timeout) {
		printk(BIOS_ERR,
		       "Couldn't cleanup the keyboard controller buffers\n");
		printk(BIOS_ERR, "Status (0x%x): 0x%x, Buffer (0x%x): 0x%x\n",
		       KBD_STATUS, inb(KBD_STATUS), KBD_DATA, inb(KBD_DATA));
	}

	return !!timeout;
}

static int kbc_self_test(void)
{
	u8 self_test;

	/* Clean up any junk that might have been in the KBC.
	 * Both input and output buffers must be empty.
	 */
	if (!kbc_cleanup_buffers())
		return 0;

	/* reset/self test 8042 - send cmd 0xAA */
	outb(KBC_CMD_SELF_TEST, KBD_COMMAND);

	if (!kbc_output_buffer_full()) {
		/* There probably is no keyboard controller. */
		printk(BIOS_ERR, "Could not reset keyboard controller.\n");
		return 0;
	}

	/* read self-test result, 0x55 is returned in the output buffer */
	self_test = inb(KBD_DATA);

	if (self_test != 0x55) {
		printk(BIOS_ERR, "Keyboard Controller self-test failed: 0x%x\n",
		       self_test);
		return 0;
	}

	/* ensure the buffers are empty */
	kbc_cleanup_buffers();

	/* keyboard interface test */
	outb(KBC_CMD_KBD_TEST, KBD_COMMAND);

	if (!kbc_output_buffer_full()) {
		printk(BIOS_ERR, "Keyboard Interface test timed out.\n");
		return 0;
	}

	/* read test result, 0x00 should be returned in case of no failures */
	self_test = inb(KBD_DATA);

	if (self_test != 0x00) {
		printk(BIOS_ERR, "Keyboard Interface test failed: 0x%x\n",
		       self_test);
		return 0;
	}

	return 1;
}

static u8 send_keyboard(u8 command)
{
	u8 regval = 0;
	u8 resend = 10;

	do {
		if (!kbc_input_buffer_empty())
			return 0;
		outb(command, KBD_DATA);
		/* the reset command takes much longer then normal commands and
		 * even worse, some keyboards do send the ACK _after_ doing the
		 * reset */
		if (command == 0xFF) {
			u8 retries;
			for (retries = 9; retries && !kbc_output_buffer_full();
			     retries--) ;
		}
		if (!kbc_output_buffer_full()) {
			printk(BIOS_ERR,
			       "Could not send keyboard command %02x\n",
			       command);
			return 0;
		}
		regval = inb(KBD_DATA);
		--resend;
	} while (regval == KBD_REPLY_RESEND && resend > 0);

	return regval;
}

void pc_keyboard_init(struct pc_keyboard *keyboard)
{
	u8 retries;
	u8 regval;
	if (!CONFIG_DRIVERS_PS2_KEYBOARD)
		return;

#if CONFIG_HAVE_ACPI_RESUME
	if (acpi_slp_type == 3)
		return;
#endif

	printk(BIOS_DEBUG, "Keyboard init...\n");

	/* Run a keyboard controller self-test */
	if (!kbc_self_test())
		return;

	/* Enable keyboard interface - No IRQ */
	if (!kbc_input_buffer_empty())
		return;
	outb(0x60, KBD_COMMAND);
	if (!kbc_input_buffer_empty())
		return;
	outb(0x20, KBD_DATA);	/* send cmd: enable keyboard */
	if (!kbc_input_buffer_empty()) {
		printk(BIOS_INFO, "Timeout while enabling keyboard\n");
		return;
	}

	/* 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 == KBD_REPLY_RESEND) {
		/* keeps sending RESENDs, probably no keyboard. */
		printk(BIOS_INFO, "No PS/2 keyboard detected.\n");
		return;
	}

	if (regval != KBD_REPLY_ACK) {
		printk(BIOS_ERR, "Keyboard reset failed ACK: 0x%x\n", regval);
		return;
	}

	/* the reset command takes some time, so wait a little longer */
	for (retries = 9; retries && !kbc_output_buffer_full(); retries--) ;

	if (!kbc_output_buffer_full()) {
		printk(BIOS_ERR, "Timeout waiting for keyboard after reset.\n");
		return;
	}

	regval = inb(KBD_DATA);
	if (regval != 0xAA) {
		printk(BIOS_ERR, "Keyboard reset 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 != KBD_REPLY_ACK) {
		printk(BIOS_ERR, "Keyboard disable failed ACK: 0x%x\n", regval);
		return;
	}

	/* Set scancode command */
	regval = send_keyboard(0xF0);
	if (regval != KBD_REPLY_ACK) {
		printk(BIOS_ERR, "Keyboard set scancode cmd failed ACK: 0x%x\n",
		       regval);
		return;
	}
	/* Set scancode mode 2 */
	regval = send_keyboard(0x02);
	if (regval != KBD_REPLY_ACK) {
		printk(BIOS_ERR,
		       "Keyboard set scancode mode failed ACK: 0x%x\n", regval);
		return;
	}

	/* All is well - enable keyboard interface */
	if (!kbc_input_buffer_empty())
		return;
	outb(0x60, KBD_COMMAND);
	if (!kbc_input_buffer_empty())
		return;
	outb(0x65, KBD_DATA);	/* send cmd: enable keyboard and IRQ 1 */
	if (!kbc_input_buffer_empty()) {
		printk(BIOS_ERR, "Timeout during keyboard enable\n");
		return;
	}

	/* enable the keyboard */
	regval = send_keyboard(0xF4);
	if (regval != KBD_REPLY_ACK) {
		printk(BIOS_ERR, "Keyboard enable failed ACK: 0x%x\n", regval);
		return;
	}
}

/*
 * 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)
{
	/* Run a keyboard controller self-test */
	if (!kbc_self_test())
		return;

	/* Support PS/2 mode */
	if (!kbc_input_buffer_empty())
		return;
	outb(0xcb, KBD_COMMAND);

	if (!kbc_input_buffer_empty())
		return;
	outb(0x01, KBD_DATA);

	kbc_cleanup_buffers();
}