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
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <delay.h>
#include <soc/rtc_common.h>
#include <soc/rtc.h>
#include <soc/mt6391.h>
#include <soc/pmic_wrap.h>
#include <types.h>
#define RTC_GPIO_USER_MASK ((1 << 13) - (1 << 8))
/* initialize rtc related gpio */
static int rtc_gpio_init(void)
{
u16 con;
mt6391_gpio_set_pull(3, MT6391_GPIO_PULL_DISABLE,
MT6391_GPIO_PULL_DOWN); /* RTC_32K1V8 */
/* Export 32K clock RTC_32K2V8 */
rtc_read(RTC_CON, &con);
con &= (RTC_CON_LPSTA_RAW | RTC_CON_LPRST | RTC_CON_LPEN);
con |= (RTC_CON_GPEN | RTC_CON_GOE);
con &= ~(RTC_CON_F32KOB);
rtc_write(RTC_CON, con);
return rtc_write_trigger();
}
/* set xosc mode */
void rtc_osc_init(void)
{
u16 con;
/* enable 32K export */
rtc_gpio_init();
rtc_write(PMIC_RG_TOP_CKTST2, 0x0);
rtc_read(RTC_OSC32CON, &con);
if ((con & 0x1f) != 0x0) /* check XOSCCALI */
rtc_xosc_write(0x3);
}
/* low power detect setting */
static int rtc_lpd_init(void)
{
pwrap_write_field(RTC_CON, RTC_CON_LPEN, RTC_CON_LPRST, 0);
if (!rtc_write_trigger())
return 0;
pwrap_write_field(RTC_CON, RTC_CON_LPRST, 0, 0);
if (!rtc_write_trigger())
return 0;
pwrap_write_field(RTC_CON, 0, RTC_CON_LPRST, 0);
if (!rtc_write_trigger())
return 0;
return 1;
}
/* rtc init check */
int rtc_init(u8 recover)
{
int ret;
rtc_info("recovery: %d\n", recover);
if (!rtc_writeif_unlock()) {
ret = -RTC_STATUS_WRITEIF_UNLOCK_FAIL;
goto err;
}
if (!rtc_gpio_init()) {
ret = -RTC_STATUS_GPIO_INIT_FAIL;
goto err;
}
/* Use SW to detect 32K mode instead of HW */
if (recover)
pwrap_write_field(PMIC_RG_CHRSTATUS, 0x4, 0x1, 9);
if (!rtc_xosc_write(0x3)) {
ret = -RTC_STATUS_OSC_SETTING_FAIL;
goto err;
}
if (recover)
mdelay(1000);
/* write powerkeys */
rtc_write(RTC_POWERKEY1, RTC_POWERKEY1_KEY);
rtc_write(RTC_POWERKEY2, RTC_POWERKEY2_KEY);
if (!rtc_write_trigger()) {
ret = -RTC_STATUS_POWERKEY_INIT_FAIL;
goto err;
}
if (recover)
pwrap_write_field(PMIC_RG_CHRSTATUS, 0, 0x4, 9);
if (!rtc_xosc_write(0)) {
ret = -RTC_STATUS_OSC_SETTING_FAIL;
goto err;
}
if (!rtc_reg_init()) {
ret = -RTC_STATUS_REG_INIT_FAIL;
goto err;
}
if (!rtc_lpd_init()) {
ret = -RTC_STATUS_LPD_INIT_FAIL;
goto err;
}
return RTC_STATUS_OK;
err:
rtc_info("init fail: ret=%d\n", ret);
return ret;
}
/* enable rtc bbpu */
static void rtc_bbpu_power_on(void)
{
u16 bbpu;
int ret;
/* pull PWRBB high */
bbpu = RTC_BBPU_KEY | RTC_BBPU_AUTO | RTC_BBPU_BBPU | RTC_BBPU_PWREN;
rtc_write(RTC_BBPU, bbpu);
ret = rtc_write_trigger();
rtc_info("rtc_write_trigger=%d\n", ret);
/* enable DCXO to transform external 32KHz clock to 26MHz clock
directly sent to SoC */
pwrap_write_field(PMIC_RG_DCXO_FORCE_MODE1, BIT(11), 0, 0);
pwrap_write_field(PMIC_RG_DCXO_POR2_CON3,
BIT(8) | BIT(9) | BIT(10) | BIT(11), 0, 0);
pwrap_write_field(PMIC_RG_DCXO_CON2,
BIT(1) | BIT(3) | BIT(5) | BIT(6), 0, 0);
rtc_read(RTC_BBPU, &bbpu);
rtc_info("done BBPU=%#x\n", bbpu);
/* detect hw clock done,close RG_RTC_75K_PDN for low power setting. */
pwrap_write_field(PMIC_RG_TOP_CKPDN2, 0x1, 0, 14);
}
/* the rtc boot flow entry */
void rtc_boot(void)
{
rtc_write(PMIC_RG_TOP_CKPDN, 0);
rtc_write(PMIC_RG_TOP_CKPDN2, 0);
rtc_boot_common();
rtc_bbpu_power_on();
}
|
