1 // SPDX-License-Identifier: GPL-2.0+
8 * Date & Time support for Marvell Integrated RTC
16 #include <linux/delay.h>
19 /* This RTC does not support century, so we assume 20 */
22 static int __mv_rtc_get(struct mvrtc_registers *regs, struct rtc_time *t)
27 /* read the time register */
28 time = readl(®s->time);
30 /* read the date register */
31 date = readl(®s->date);
33 /* test for 12 hour clock (can't tell if it's am/pm) */
34 if (time & MVRTC_HRFMT_MSK) {
35 printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n");
40 t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
41 t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK);
42 t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
43 t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK);
47 t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
48 t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK);
49 t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
50 t->tm_year += CENTURY * 100;
52 /* not supported in this RTC */
60 int rtc_get(struct rtc_time *t)
62 struct mvrtc_registers *regs;
64 regs = (struct mvrtc_registers *)KW_RTC_BASE;
65 return __mv_rtc_get(regs, t);
67 #endif /* !CONFIG_DM_RTC */
69 static int __mv_rtc_set(struct mvrtc_registers *regs, const struct rtc_time *t)
71 u32 time = 0; /* sets hour format bit to zero, 24hr format. */
74 /* check that this code isn't 80+ years old ;-) */
75 if ((t->tm_year / 100) != CENTURY)
76 printf("Warning: Only century %d supported.\n", CENTURY);
79 time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT;
80 time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT;
81 time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
82 time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT;
85 date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
86 date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT;
87 date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
89 /* write the time register */
90 writel(time, ®s->time);
92 /* write the date register */
93 writel(date, ®s->date);
99 int rtc_set(struct rtc_time *t)
101 struct mvrtc_registers *regs;
103 regs = (struct mvrtc_registers *)KW_RTC_BASE;
104 return __mv_rtc_set(regs, t);
106 #endif /* !CONFIG_DM_RTC */
108 static void __mv_rtc_reset(struct mvrtc_registers *regs)
113 /* no init routine for this RTC needed, just check that it's working */
114 time = readl(®s->time);
115 sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
117 time = readl(®s->time);
119 if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
120 printf("Error: RTC did not increment.\n");
123 #ifndef CONFIG_DM_RTC
126 struct mvrtc_registers *regs;
128 regs = (struct mvrtc_registers *)KW_RTC_BASE;
129 __mv_rtc_reset(regs);
131 #endif /* !CONFIG_DM_RTC */
134 static int mv_rtc_get(struct udevice *dev, struct rtc_time *tm)
136 struct mvrtc_pdata *pdata = dev_get_plat(dev);
137 struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
139 return __mv_rtc_get(regs, tm);
142 static int mv_rtc_set(struct udevice *dev, const struct rtc_time *tm)
144 struct mvrtc_pdata *pdata = dev_get_plat(dev);
145 struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
147 return __mv_rtc_set(regs, tm);
150 static int mv_rtc_reset(struct udevice *dev)
152 struct mvrtc_pdata *pdata = dev_get_plat(dev);
153 struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
155 __mv_rtc_reset(regs);
159 static const struct rtc_ops mv_rtc_ops = {
162 .reset = mv_rtc_reset,
165 static const struct udevice_id mv_rtc_ids[] = {
166 { .compatible = "marvell,kirkwood-rtc" },
167 { .compatible = "marvell,orion-rtc" },
171 static int mv_rtc_of_to_plat(struct udevice *dev)
173 struct mvrtc_pdata *pdata = dev_get_plat(dev);
175 pdata->iobase = dev_read_addr(dev);
179 U_BOOT_DRIVER(rtc_mv) = {
182 .of_to_plat = mv_rtc_of_to_plat,
183 .of_match = mv_rtc_ids,
186 #endif /* CONFIG_DM_RTC */