1 /*
2 * Copyright (c) 2020, MediaTek Inc. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <common/debug.h>
8 #include <drivers/delay_timer.h>
9 #include <rtc.h>
10
11
RTC_Config_Interface(uint32_t addr,uint16_t data,uint16_t mask,uint16_t shift)12 static void RTC_Config_Interface(uint32_t addr, uint16_t data,
13 uint16_t mask, uint16_t shift)
14 {
15 uint16_t pmic_reg;
16
17 pmic_reg = RTC_Read(addr);
18
19 pmic_reg &= ~(mask << shift);
20 pmic_reg |= (data << shift);
21
22 RTC_Write(addr, pmic_reg);
23 }
24
rtc_disable_2sec_reboot(void)25 static int32_t rtc_disable_2sec_reboot(void)
26 {
27 uint16_t reboot;
28
29 reboot = (RTC_Read(RTC_AL_SEC) & ~RTC_BBPU_2SEC_EN) &
30 ~RTC_BBPU_AUTO_PDN_SEL;
31 RTC_Write(RTC_AL_SEC, reboot);
32
33 return RTC_Write_Trigger();
34 }
35
rtc_enable_k_eosc(void)36 static int32_t rtc_enable_k_eosc(void)
37 {
38 uint16_t alm_dow, alm_sec;
39 int16_t ret;
40
41 /* Turning on eosc cali mode clock */
42 RTC_Config_Interface(PMIC_RG_SCK_TOP_CKPDN_CON0_CLR, 1,
43 PMIC_RG_RTC_EOSC32_CK_PDN_MASK,
44 PMIC_RG_RTC_EOSC32_CK_PDN_SHIFT);
45
46 alm_sec = RTC_Read(RTC_AL_SEC) & (~RTC_LPD_OPT_MASK);
47 RTC_Write(RTC_AL_SEC, alm_sec);
48 ret = RTC_Write_Trigger();
49 if (ret == 0) {
50 return 0;
51 }
52
53 RTC_Write(RTC_CON, RTC_LPD_EN);
54 ret = RTC_Write_Trigger();
55 if (ret == 0) {
56 return 0;
57 }
58
59 RTC_Write(RTC_CON, RTC_LPD_RST);
60 ret = RTC_Write_Trigger();
61 if (ret == 0) {
62 return 0;
63 }
64
65 RTC_Write(RTC_CON, RTC_LPD_EN);
66 ret = RTC_Write_Trigger();
67 if (ret == 0) {
68 return 0;
69 }
70
71 RTC_Write(RTC_POWERKEY1, RTC_POWERKEY1_KEY);
72 RTC_Write(RTC_POWERKEY2, RTC_POWERKEY2_KEY);
73 ret = RTC_Write_Trigger();
74 if (ret == 0) {
75 return 0;
76 }
77
78 /* set RTC EOSC calibration period = 8sec */
79 alm_dow = (RTC_Read(RTC_AL_DOW) & (~RTC_RG_EOSC_CALI_TD_MASK)) |
80 RTC_RG_EOSC_CALI_TD_8SEC;
81 RTC_Write(RTC_AL_DOW, alm_dow);
82 ret = RTC_Write_Trigger();
83 if (ret == 0) {
84 return 0;
85 }
86
87 RTC_Write(RTC_BBPU,
88 RTC_Read(RTC_BBPU) | RTC_BBPU_KEY | RTC_BBPU_RELOAD);
89 ret = RTC_Write_Trigger();
90 if (ret == 0) {
91 return 0;
92 }
93
94 /* Enable K EOSC mode :use solution1 of eosc cali to fix mt6359p 32K*/
95 RTC_Write(RTC_AL_YEA, (((RTC_Read(RTC_AL_YEA) | RTC_K_EOSC_RSV_0)
96 & (~RTC_K_EOSC_RSV_1)) | (RTC_K_EOSC_RSV_2)));
97 ret = RTC_Write_Trigger();
98 if (ret == 0) {
99 return 0;
100 }
101
102 INFO("[RTC] RTC_enable_k_eosc\n");
103
104 return 1;
105 }
106
rtc_power_off_sequence(void)107 void rtc_power_off_sequence(void)
108 {
109 uint16_t bbpu;
110 int16_t ret;
111
112 ret = rtc_disable_2sec_reboot();
113 if (ret == 0) {
114 return;
115 }
116
117 ret = rtc_enable_k_eosc();
118 if (ret == 0) {
119 return;
120 }
121
122 bbpu = RTC_BBPU_KEY | RTC_BBPU_PWREN;
123
124 if (Writeif_unlock() != 0) {
125 RTC_Write(RTC_BBPU,
126 bbpu | RTC_BBPU_RESET_ALARM | RTC_BBPU_RESET_SPAR);
127 RTC_Write(RTC_AL_MASK, RTC_AL_MASK_DOW);
128 ret = RTC_Write_Trigger();
129 if (ret == 0) {
130 return;
131 }
132 mdelay(1);
133
134 bbpu = RTC_Read(RTC_BBPU);
135
136 if (((bbpu & RTC_BBPU_RESET_ALARM) > 0) ||
137 ((bbpu & RTC_BBPU_RESET_SPAR) > 0)) {
138 INFO("[RTC] timeout\n");
139 }
140
141 bbpu = RTC_Read(RTC_BBPU) | RTC_BBPU_KEY | RTC_BBPU_RELOAD;
142 RTC_Write(RTC_BBPU, bbpu);
143 ret = RTC_Write_Trigger();
144 if (ret == 0) {
145 return;
146 }
147 }
148 }
149