summaryrefslogtreecommitdiff
path: root/util/ectool/ec.c
blob: e008ac44d0716e37b8418b17c59df3a2ec1be43b (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
/* This file is part of the ectool project. */
/* SPDX-License-Identifier: GPL-2.0-only */

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if !(defined __NetBSD__ || defined __OpenBSD__)
#include <sys/io.h>
#endif
#include "ec.h"

static int ec_data = 0x62;
static int ec_sc = 0x66;

#if defined __NetBSD__ || defined __OpenBSD__
#include <machine/sysarch.h>
static uint8_t inb(unsigned port)
{
	uint8_t data;
	__asm volatile("inb %w1,%0" : "=a" (data) : "d" (port));
	return data;
}
static __inline void outb(uint8_t data, unsigned port)
{
	__asm volatile("outb %0,%w1" : : "a" (data), "d" (port));
}
#endif

extern int verbose;

#define debug(x...) if (verbose) printf(x)

int send_ec_command(uint8_t command)
{
	int timeout;

	timeout = 0x7ff;
	while ((inb(ec_sc) & EC_IBF) && --timeout) {
		usleep(10);
		if ((timeout & 0xff) == 0)
			debug(".");
	}
	if (!timeout) {
		debug("Timeout while sending command 0x%02x to EC!\n",
		       command);
		// return -1;
	}

	outb(command, ec_sc);
	return 0;
}

int send_ec_data(uint8_t data)
{
	int timeout;

	timeout = 0x7ff;
	while ((inb(ec_sc) & EC_IBF) && --timeout) {	// wait for IBF = 0
		usleep(10);
		if ((timeout & 0xff) == 0)
			debug(".");
	}
	if (!timeout) {
		debug("Timeout while sending data 0x%02x to EC!\n", data);
		// return -1;
	}

	outb(data, ec_data);

	return 0;
}

int send_ec_data_nowait(uint8_t data)
{
	outb(data, ec_data);

	return 0;
}

uint8_t recv_ec_data(void)
{
	int timeout;
	uint8_t data;

	timeout = 0x7fff;
	while (--timeout) {	// Wait for OBF = 1
		if (inb(ec_sc) & EC_OBF)
			break;

		usleep(10);
		if ((timeout & 0xff) == 0)
			debug(".");
	}
	if (!timeout) {
		debug("\nTimeout while receiving data from EC!\n");
		// return -1;
	}

	data = inb(ec_data);
	debug("recv_ec_data: 0x%02x\n", data);

	return data;
}

uint8_t ec_read(uint8_t addr)
{
	send_ec_command(RD_EC);
	send_ec_data(addr);

	return recv_ec_data();
}

uint8_t ec_ext_read(uint16_t addr)
{
	send_ec_command(WR_EC);
	send_ec_data(0x02);
	send_ec_data(addr & 0xff);
	send_ec_command(RX_EC);
	send_ec_data(addr >> 8);

	return recv_ec_data();
}

int ec_ext_write(uint16_t addr, uint8_t data)
{
	send_ec_command(WR_EC);
	send_ec_data(0x02);
	send_ec_data(addr & 0xff);
	send_ec_command(WX_EC);
	send_ec_data(addr >> 8);

	return send_ec_data(data);
}

int ec_write(uint8_t addr, uint8_t data)
{
	send_ec_command(WR_EC);
	send_ec_data(addr);

	return send_ec_data(data);
}

uint8_t ec_idx_read(uint16_t addr)
{
	uint16_t lpc_idx = 0x380;

	outb(addr & 0xff, lpc_idx + 2);
	outb(addr >> 8, lpc_idx + 1);

	return inb(lpc_idx + 3);
}

uint8_t ec_query(void)
{
	send_ec_command(QR_EC);
	return recv_ec_data();
}

int get_ec_ports(void)
{
	FILE *fp = fopen("/proc/ioports", "r");
	int data = 0, cmd = 0;
	char line[100];

	if (fp == NULL)
		return -1;

	while (!feof(fp) && (data == 0 || cmd == 0)) {
		fgets(line, sizeof(line), fp);
		if (strstr(line, "EC data") != NULL)
			data = strtol(line, NULL, 16);

		if (strstr(line, "EC cmd") != NULL)
			cmd = strtol(line, NULL, 16);
	}

	fclose(fp);
	if (data != 0 && cmd != 0) {
		debug("EC data = 0x%x, EC cmd = 0x%x\n", data, cmd);
		ec_data = data;
		ec_sc = cmd;
	} else {
		return -1;
	}
	return 0;
}