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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* 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 <arch/io.h>
#include <console/console.h>
#include <delay.h>
#include <device/pnp.h>
#include <pc80/keyboard.h>
#include <stdint.h>
#include <stdlib.h>
#include "chip.h"
#include "ec.h"
#include "ec_commands.h"
static int google_chromeec_wait_ready(u16 port)
{
u8 ec_status = inb(port);
u32 time_count = 0;
/*
* One second is more than plenty for any EC operation to complete
* (and the bus accessing/code execution) overhead will make the
* timeout even longer.
*/
#define MAX_EC_TIMEOUT_US 1000000
while (ec_status &
(EC_LPC_CMDR_PENDING | EC_LPC_CMDR_BUSY)) {
udelay(1);
if (time_count++ == MAX_EC_TIMEOUT_US)
return -1;
ec_status = inb(port);
}
return 0;
}
int google_chromeec_command(struct chromeec_command *cec_command)
{
struct ec_lpc_host_args args;
const u8 *d;
u8 *dout;
u8 cmd_code = cec_command->cmd_code;
int csum;
int i;
/* Fill in args */
args.flags = EC_HOST_ARGS_FLAG_FROM_HOST;
args.command_version = cec_command->cmd_version;
args.data_size = cec_command->cmd_size_in;
/* Initialize checksum */
csum = cmd_code + args.flags + args.command_version + args.data_size;
/* Write data and update checksum */
for (i = 0, d = (const u8 *)cec_command->cmd_data_in;
i < cec_command->cmd_size_in; i++, d++) {
outb(*d, EC_LPC_ADDR_HOST_PARAM + i);
csum += *d;
}
/* Finalize checksum and write args */
args.checksum = (u8)csum;
for (i = 0, d = (const u8 *)&args; i < sizeof(args); i++, d++)
outb(*d, EC_LPC_ADDR_HOST_ARGS + i);
/* Issue the command */
outb(cmd_code, EC_LPC_ADDR_HOST_CMD);
if (google_chromeec_wait_ready(EC_LPC_ADDR_HOST_CMD)) {
printk(BIOS_ERR, "Timeout waiting for EC process command %d!\n",
cec_command->cmd_code);
return 1;
}
/* Check result */
cec_command->cmd_code = inb(EC_LPC_ADDR_HOST_DATA);
if (cec_command->cmd_code)
return 1;
/* Read back args */
for (i = 0, dout = (u8 *)&args; i < sizeof(args); i++, dout++)
*dout = inb(EC_LPC_ADDR_HOST_ARGS + i);
/*
* If EC didn't modify args flags, then somehow we sent a new-style
* command to an old EC, which means it would have read its params
* from the wrong place.
*/
if (!(args.flags & EC_HOST_ARGS_FLAG_TO_HOST)) {
printk(BIOS_ERR, "EC protocol mismatch\n");
return 1;
}
if (args.data_size > cec_command->cmd_size_out) {
printk(BIOS_ERR, "EC returned too much data\n");
return 1;
}
cec_command->cmd_size_out = args.data_size;
/* Start calculating response checksum */
csum = cmd_code + args.flags + args.command_version + args.data_size;
/* Read data, if any */
for (i = 0, dout = (u8 *)cec_command->cmd_data_out;
i < args.data_size; i++, dout++) {
*dout = inb(EC_LPC_ADDR_HOST_PARAM + i);
csum += *dout;
}
/* Verify checksum */
if (args.checksum != (u8)csum) {
printk(BIOS_ERR, "EC response has invalid checksum\n");
return 1;
}
return 0;
}
#ifndef __PRE_RAM__
#ifndef __SMM__
static void lpc_ec_init(struct device *dev)
{
if (!dev->enabled)
return;
pc_keyboard_init();
google_chromeec_init();
}
static void lpc_ec_read_resources(struct device *dev)
{
/* Nothing, but this function avoids an error on serial console. */
}
static void lpc_ec_enable_resources(struct device *dev)
{
/* Nothing, but this function avoids an error on serial console. */
}
static struct device_operations ops = {
.init = lpc_ec_init,
.read_resources = lpc_ec_read_resources,
.enable_resources = lpc_ec_enable_resources
};
static struct pnp_info pnp_dev_info[] = {
{ &ops, 0, 0, { 0, 0 }, }
};
static void enable_dev(struct device *dev)
{
pnp_enable_devices(dev, &pnp_ops, ARRAY_SIZE(pnp_dev_info),
pnp_dev_info);
}
struct chip_operations ec_google_chromeec_ops = {
CHIP_NAME("Google Chrome EC")
.enable_dev = enable_dev,
};
#endif /* __SMM__ */
u8 google_chromeec_get_event(void)
{
if (google_chromeec_wait_ready(EC_LPC_ADDR_ACPI_CMD)) {
printk(BIOS_ERR, "Timeout waiting for EC ready!\n");
return 1;
}
/* Issue the ACPI query-event command */
outb(EC_CMD_ACPI_QUERY_EVENT, EC_LPC_ADDR_ACPI_CMD);
if (google_chromeec_wait_ready(EC_LPC_ADDR_ACPI_CMD)) {
printk(BIOS_ERR, "Timeout waiting for EC QUERY_EVENT!\n");
return 0;
}
/* Event (or 0 if none) is returned directly in the data byte */
return inb(EC_LPC_ADDR_ACPI_DATA);
}
#endif
|
