1 // SPDX-License-Identifier: GPL-2.0+
4 * Jason Cooper <u-boot@lakedaemon.net>
8 * Date & Time support for Marvell Integrated RTC
17 /* This RTC does not support century, so we assume 20 */
20 static int __mv_rtc_get(struct mvrtc_registers *regs, struct rtc_time *t)
25 /* read the time register */
26 time = readl(®s->time);
28 /* read the date register */
29 date = readl(®s->date);
31 /* test for 12 hour clock (can't tell if it's am/pm) */
32 if (time & MVRTC_HRFMT_MSK) {
33 printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n");
38 t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
39 t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK);
40 t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
41 t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK);
45 t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
46 t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK);
47 t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
48 t->tm_year += CENTURY * 100;
50 /* not supported in this RTC */
58 int rtc_get(struct rtc_time *t)
60 struct mvrtc_registers *regs;
62 regs = (struct mvrtc_registers *)KW_RTC_BASE;
63 return __mv_rtc_get(regs, t);
65 #endif /* !CONFIG_DM_RTC */
67 static int __mv_rtc_set(struct mvrtc_registers *regs, const struct rtc_time *t)
69 u32 time = 0; /* sets hour format bit to zero, 24hr format. */
72 /* check that this code isn't 80+ years old ;-) */
73 if ((t->tm_year / 100) != CENTURY)
74 printf("Warning: Only century %d supported.\n", CENTURY);
77 time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT;
78 time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT;
79 time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
80 time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT;
83 date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
84 date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT;
85 date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
87 /* write the time register */
88 writel(time, ®s->time);
90 /* write the date register */
91 writel(date, ®s->date);
97 int rtc_set(struct rtc_time *t)
99 struct mvrtc_registers *regs;
101 regs = (struct mvrtc_registers *)KW_RTC_BASE;
102 return __mv_rtc_set(regs, t);
104 #endif /* !CONFIG_DM_RTC */
106 static void __mv_rtc_reset(struct mvrtc_registers *regs)
111 /* no init routine for this RTC needed, just check that it's working */
112 time = readl(®s->time);
113 sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
115 time = readl(®s->time);
117 if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
118 printf("Error: RTC did not increment.\n");
121 #ifndef CONFIG_DM_RTC
124 struct mvrtc_registers *regs;
126 regs = (struct mvrtc_registers *)KW_RTC_BASE;
127 __mv_rtc_reset(regs);
129 #endif /* !CONFIG_DM_RTC */