1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2011
4 * Jason Cooper <u-boot@lakedaemon.net>
5 */
6
7 /*
8 * Date & Time support for Marvell Integrated RTC
9 */
10
11 #include <common.h>
12 #include <command.h>
13 #include <dm.h>
14 #include <rtc.h>
15 #include <asm/io.h>
16 #include "mvrtc.h"
17
18 /* This RTC does not support century, so we assume 20 */
19 #define CENTURY 20
20
__mv_rtc_get(struct mvrtc_registers * regs,struct rtc_time * t)21 static int __mv_rtc_get(struct mvrtc_registers *regs, struct rtc_time *t)
22 {
23 u32 time;
24 u32 date;
25
26 /* read the time register */
27 time = readl(®s->time);
28
29 /* read the date register */
30 date = readl(®s->date);
31
32 /* test for 12 hour clock (can't tell if it's am/pm) */
33 if (time & MVRTC_HRFMT_MSK) {
34 printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n");
35 return -1;
36 }
37
38 /* time */
39 t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
40 t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK);
41 t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
42 t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK);
43 t->tm_wday--;
44
45 /* date */
46 t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
47 t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK);
48 t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
49 t->tm_year += CENTURY * 100;
50
51 /* not supported in this RTC */
52 t->tm_yday = 0;
53 t->tm_isdst = 0;
54
55 return 0;
56 }
57
58 #ifndef CONFIG_DM_RTC
rtc_get(struct rtc_time * t)59 int rtc_get(struct rtc_time *t)
60 {
61 struct mvrtc_registers *regs;
62
63 regs = (struct mvrtc_registers *)KW_RTC_BASE;
64 return __mv_rtc_get(regs, t);
65 }
66 #endif /* !CONFIG_DM_RTC */
67
__mv_rtc_set(struct mvrtc_registers * regs,const struct rtc_time * t)68 static int __mv_rtc_set(struct mvrtc_registers *regs, const struct rtc_time *t)
69 {
70 u32 time = 0; /* sets hour format bit to zero, 24hr format. */
71 u32 date = 0;
72
73 /* check that this code isn't 80+ years old ;-) */
74 if ((t->tm_year / 100) != CENTURY)
75 printf("Warning: Only century %d supported.\n", CENTURY);
76
77 /* time */
78 time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT;
79 time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT;
80 time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
81 time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT;
82
83 /* date */
84 date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
85 date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT;
86 date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
87
88 /* write the time register */
89 writel(time, ®s->time);
90
91 /* write the date register */
92 writel(date, ®s->date);
93
94 return 0;
95 }
96
97 #ifndef CONFIG_DM_RTC
rtc_set(struct rtc_time * t)98 int rtc_set(struct rtc_time *t)
99 {
100 struct mvrtc_registers *regs;
101
102 regs = (struct mvrtc_registers *)KW_RTC_BASE;
103 return __mv_rtc_set(regs, t);
104 }
105 #endif /* !CONFIG_DM_RTC */
106
__mv_rtc_reset(struct mvrtc_registers * regs)107 static void __mv_rtc_reset(struct mvrtc_registers *regs)
108 {
109 u32 time;
110 u32 sec;
111
112 /* no init routine for this RTC needed, just check that it's working */
113 time = readl(®s->time);
114 sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
115 udelay(1000000);
116 time = readl(®s->time);
117
118 if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
119 printf("Error: RTC did not increment.\n");
120 }
121
122 #ifndef CONFIG_DM_RTC
rtc_reset(void)123 void rtc_reset(void)
124 {
125 struct mvrtc_registers *regs;
126
127 regs = (struct mvrtc_registers *)KW_RTC_BASE;
128 __mv_rtc_reset(regs);
129 }
130 #endif /* !CONFIG_DM_RTC */
131
132 #ifdef CONFIG_DM_RTC
mv_rtc_get(struct udevice * dev,struct rtc_time * tm)133 static int mv_rtc_get(struct udevice *dev, struct rtc_time *tm)
134 {
135 struct mvrtc_pdata *pdata = dev_get_platdata(dev);
136 struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
137
138 return __mv_rtc_get(regs, tm);
139 }
140
mv_rtc_set(struct udevice * dev,const struct rtc_time * tm)141 static int mv_rtc_set(struct udevice *dev, const struct rtc_time *tm)
142 {
143 struct mvrtc_pdata *pdata = dev_get_platdata(dev);
144 struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
145
146 return __mv_rtc_set(regs, tm);
147 }
148
mv_rtc_reset(struct udevice * dev)149 static int mv_rtc_reset(struct udevice *dev)
150 {
151 struct mvrtc_pdata *pdata = dev_get_platdata(dev);
152 struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
153
154 __mv_rtc_reset(regs);
155 return 0;
156 }
157
158 static const struct rtc_ops mv_rtc_ops = {
159 .get = mv_rtc_get,
160 .set = mv_rtc_set,
161 .reset = mv_rtc_reset,
162 };
163
164 static const struct udevice_id mv_rtc_ids[] = {
165 { .compatible = "marvell,kirkwood-rtc" },
166 { .compatible = "marvell,orion-rtc" },
167 { }
168 };
169
mv_rtc_ofdata_to_platdata(struct udevice * dev)170 static int mv_rtc_ofdata_to_platdata(struct udevice *dev)
171 {
172 struct mvrtc_pdata *pdata = dev_get_platdata(dev);
173
174 pdata->iobase = devfdt_get_addr(dev);
175 return 0;
176 }
177
178 U_BOOT_DRIVER(rtc_mv) = {
179 .name = "rtc-mv",
180 .id = UCLASS_RTC,
181 .ofdata_to_platdata = mv_rtc_ofdata_to_platdata,
182 .of_match = mv_rtc_ids,
183 .ops = &mv_rtc_ops,
184 };
185 #endif /* CONFIG_DM_RTC */
186