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
|
/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <boardid.h>
#include <boot/coreboot_tables.h>
#include <console/console.h>
#include <delay.h>
#include <drivers/i2c/ww_ring/ww_ring.h>
#include <gpio.h>
#include <soc/cdp.h>
#include <soc/gsbi.h>
#include <timer.h>
#include <vendorcode/google/chromeos/chromeos.h>
#define DEV_SW 15
#define REC_SW 16
#define WP_SW 17
static int read_gpio(gpio_t gpio_num)
{
gpio_tlmm_config_set(gpio_num, GPIO_FUNC_DISABLE,
GPIO_NO_PULL, GPIO_2MA, GPIO_DISABLE);
udelay(10); /* Should be enough to settle. */
return gpio_get(gpio_num);
}
void fill_lb_gpios(struct lb_gpios *gpios)
{
struct lb_gpio chromeos_gpios[] = {
{DEV_SW, ACTIVE_LOW, read_gpio(REC_SW), "presence"},
{-1, ACTIVE_LOW, 1, "power"},
{-1, ACTIVE_LOW, 0, "lid"},
};
lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios));
}
/*
* The recovery switch on storm is overloaded: it needs to be pressed for a
* certain duration at startup to signal different requests:
*
* - keeping it pressed for 8 to 16 seconds after startup signals the need for
* factory reset (wipeout);
* - keeping it pressed for longer than 16 seconds signals the need for Chrome
* OS recovery.
*
* The state is read once and cached for following inquiries. The below enum
* lists possible states.
*/
enum switch_state {
not_probed = -1,
no_req,
recovery_req,
wipeout_req
};
static void display_pattern(int pattern)
{
if (board_id() == BOARD_ID_WHIRLWIND_SP5)
ww_ring_display_pattern(GSBI_ID_7, pattern);
}
#define WIPEOUT_MODE_DELAY_MS (8 * 1000)
#define RECOVERY_MODE_EXTRA_DELAY_MS (8 * 1000)
static enum switch_state get_switch_state(void)
{
struct stopwatch sw;
int sampled_value;
static enum switch_state saved_state = not_probed;
if (saved_state != not_probed)
return saved_state;
sampled_value = !read_gpio(REC_SW);
if (!sampled_value) {
saved_state = no_req;
display_pattern(WWR_NORMAL_BOOT);
return saved_state;
}
display_pattern(WWR_RECOVERY_PUSHED);
printk(BIOS_INFO, "recovery button pressed\n");
stopwatch_init_msecs_expire(&sw, WIPEOUT_MODE_DELAY_MS);
do {
sampled_value = !read_gpio(REC_SW);
if (!sampled_value)
break;
} while (!stopwatch_expired(&sw));
if (sampled_value) {
display_pattern(WWR_WIPEOUT_REQUEST);
printk(BIOS_INFO, "wipeout requested, checking recovery\n");
stopwatch_init_msecs_expire(&sw, RECOVERY_MODE_EXTRA_DELAY_MS);
do {
sampled_value = !read_gpio(REC_SW);
if (!sampled_value)
break;
} while (!stopwatch_expired(&sw));
if (sampled_value) {
saved_state = recovery_req;
display_pattern(WWR_RECOVERY_REQUEST);
printk(BIOS_INFO, "recovery requested\n");
} else {
saved_state = wipeout_req;
}
} else {
saved_state = no_req;
display_pattern(WWR_NORMAL_BOOT);
}
return saved_state;
}
int get_recovery_mode_switch(void)
{
return get_switch_state() == recovery_req;
}
int get_wipeout_mode_switch(void)
{
return get_switch_state() == wipeout_req;
}
int get_write_protect_state(void)
{
return !read_gpio(WP_SW);
}
|
