1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Faraday FTRTC010 Real Time Clock
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * (C) Copyright 2009 Faraday Technology
5*4882a593Smuzhiyun * Po-Yu Chuang <ratbert@faraday-tech.com>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <config.h>
11*4882a593Smuzhiyun #include <common.h>
12*4882a593Smuzhiyun #include <rtc.h>
13*4882a593Smuzhiyun #include <asm/io.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun struct ftrtc010 {
16*4882a593Smuzhiyun unsigned int sec; /* 0x00 */
17*4882a593Smuzhiyun unsigned int min; /* 0x04 */
18*4882a593Smuzhiyun unsigned int hour; /* 0x08 */
19*4882a593Smuzhiyun unsigned int day; /* 0x0c */
20*4882a593Smuzhiyun unsigned int alarm_sec; /* 0x10 */
21*4882a593Smuzhiyun unsigned int alarm_min; /* 0x14 */
22*4882a593Smuzhiyun unsigned int alarm_hour; /* 0x18 */
23*4882a593Smuzhiyun unsigned int record; /* 0x1c */
24*4882a593Smuzhiyun unsigned int cr; /* 0x20 */
25*4882a593Smuzhiyun unsigned int wsec; /* 0x24 */
26*4882a593Smuzhiyun unsigned int wmin; /* 0x28 */
27*4882a593Smuzhiyun unsigned int whour; /* 0x2c */
28*4882a593Smuzhiyun unsigned int wday; /* 0x30 */
29*4882a593Smuzhiyun unsigned int intr; /* 0x34 */
30*4882a593Smuzhiyun unsigned int div; /* 0x38 */
31*4882a593Smuzhiyun unsigned int rev; /* 0x3c */
32*4882a593Smuzhiyun };
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun /*
35*4882a593Smuzhiyun * RTC Control Register
36*4882a593Smuzhiyun */
37*4882a593Smuzhiyun #define FTRTC010_CR_ENABLE (1 << 0)
38*4882a593Smuzhiyun #define FTRTC010_CR_INTERRUPT_SEC (1 << 1) /* per second irq */
39*4882a593Smuzhiyun #define FTRTC010_CR_INTERRUPT_MIN (1 << 2) /* per minute irq */
40*4882a593Smuzhiyun #define FTRTC010_CR_INTERRUPT_HR (1 << 3) /* per hour irq */
41*4882a593Smuzhiyun #define FTRTC010_CR_INTERRUPT_DAY (1 << 4) /* per day irq */
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
44*4882a593Smuzhiyun
ftrtc010_enable(void)45*4882a593Smuzhiyun static void ftrtc010_enable(void)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun writel(FTRTC010_CR_ENABLE, &rtc->cr);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun /*
51*4882a593Smuzhiyun * return current time in seconds
52*4882a593Smuzhiyun */
ftrtc010_time(void)53*4882a593Smuzhiyun static unsigned long ftrtc010_time(void)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun unsigned long day;
56*4882a593Smuzhiyun unsigned long hour;
57*4882a593Smuzhiyun unsigned long minute;
58*4882a593Smuzhiyun unsigned long second;
59*4882a593Smuzhiyun unsigned long second2;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun do {
62*4882a593Smuzhiyun second = readl(&rtc->sec);
63*4882a593Smuzhiyun day = readl(&rtc->day);
64*4882a593Smuzhiyun hour = readl(&rtc->hour);
65*4882a593Smuzhiyun minute = readl(&rtc->min);
66*4882a593Smuzhiyun second2 = readl(&rtc->sec);
67*4882a593Smuzhiyun } while (second != second2);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun /*
73*4882a593Smuzhiyun * Get the current time from the RTC
74*4882a593Smuzhiyun */
75*4882a593Smuzhiyun
rtc_get(struct rtc_time * tmp)76*4882a593Smuzhiyun int rtc_get(struct rtc_time *tmp)
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun unsigned long now;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun debug("%s(): record register: %x\n",
81*4882a593Smuzhiyun __func__, readl(&rtc->record));
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun #ifdef CONFIG_FTRTC010_PCLK
84*4882a593Smuzhiyun now = (ftrtc010_time() + readl(&rtc->record)) / RTC_DIV_COUNT;
85*4882a593Smuzhiyun #else /* CONFIG_FTRTC010_EXTCLK */
86*4882a593Smuzhiyun now = ftrtc010_time() + readl(&rtc->record);
87*4882a593Smuzhiyun #endif
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun rtc_to_tm(now, tmp);
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun return 0;
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun /*
95*4882a593Smuzhiyun * Set the RTC
96*4882a593Smuzhiyun */
rtc_set(struct rtc_time * tmp)97*4882a593Smuzhiyun int rtc_set(struct rtc_time *tmp)
98*4882a593Smuzhiyun {
99*4882a593Smuzhiyun unsigned long new;
100*4882a593Smuzhiyun unsigned long now;
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun debug("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
103*4882a593Smuzhiyun __func__,
104*4882a593Smuzhiyun tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
105*4882a593Smuzhiyun tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun new = rtc_mktime(tmp);
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun now = ftrtc010_time();
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun debug("%s(): write %lx to record register\n", __func__, new - now);
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun writel(new - now, &rtc->record);
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun return 0;
116*4882a593Smuzhiyun }
117*4882a593Smuzhiyun
rtc_reset(void)118*4882a593Smuzhiyun void rtc_reset(void)
119*4882a593Smuzhiyun {
120*4882a593Smuzhiyun debug("%s()\n", __func__);
121*4882a593Smuzhiyun ftrtc010_enable();
122*4882a593Smuzhiyun }
123