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wdenkaffae2b2002-08-17 09:36:01 +00001/*
2 * (C) Copyright 2001
3 * Denis Peter MPL AG Switzerland. d.peter@mpl.ch
4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02005 * SPDX-License-Identifier: GPL-2.0+
wdenkaffae2b2002-08-17 09:36:01 +00006 */
7
8/*
9 * Date & Time support for the MC146818 (PIXX4) RTC
10 */
11
wdenkaffae2b2002-08-17 09:36:01 +000012#include <common.h>
13#include <command.h>
Bin Menged2ac0d2015-06-23 12:18:41 +080014#include <dm.h>
wdenkaffae2b2002-08-17 09:36:01 +000015#include <rtc.h>
16
Paul Burton3ced12a2013-11-08 11:18:55 +000017#if defined(__I386__) || defined(CONFIG_MALTA)
Graeme Russ21831002011-02-12 15:11:43 +110018#include <asm/io.h>
19#define in8(p) inb(p)
20#define out8(p, v) outb(v, p)
21#endif
22
Michal Simek871c18d2008-07-14 19:45:37 +020023#if defined(CONFIG_CMD_DATE)
wdenkaffae2b2002-08-17 09:36:01 +000024
Simon Glassc6577f72014-11-14 18:18:26 -070025/* Set this to 1 to clear the CMOS RAM */
Bin Menged2ac0d2015-06-23 12:18:41 +080026#define CLEAR_CMOS 0
Simon Glassc6577f72014-11-14 18:18:26 -070027
Bin Menged2ac0d2015-06-23 12:18:41 +080028#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
Wolfgang Denk53677ef2008-05-20 16:00:29 +020029#define RTC_SECONDS 0x00
30#define RTC_SECONDS_ALARM 0x01
31#define RTC_MINUTES 0x02
32#define RTC_MINUTES_ALARM 0x03
33#define RTC_HOURS 0x04
34#define RTC_HOURS_ALARM 0x05
35#define RTC_DAY_OF_WEEK 0x06
36#define RTC_DATE_OF_MONTH 0x07
37#define RTC_MONTH 0x08
38#define RTC_YEAR 0x09
Bin Menged2ac0d2015-06-23 12:18:41 +080039#define RTC_CONFIG_A 0x0a
40#define RTC_CONFIG_B 0x0b
41#define RTC_CONFIG_C 0x0c
42#define RTC_CONFIG_D 0x0d
Simon Glassc6577f72014-11-14 18:18:26 -070043#define RTC_REG_SIZE 0x80
wdenkaffae2b2002-08-17 09:36:01 +000044
Simon Glassc6577f72014-11-14 18:18:26 -070045#define RTC_CONFIG_A_REF_CLCK_32KHZ (1 << 5)
46#define RTC_CONFIG_A_RATE_1024HZ 6
47
48#define RTC_CONFIG_B_24H (1 << 1)
49
50#define RTC_CONFIG_D_VALID_RAM_AND_TIME 0x80
wdenkaffae2b2002-08-17 09:36:01 +000051
Bin Menged2ac0d2015-06-23 12:18:41 +080052static int mc146818_read8(int reg)
wdenkaffae2b2002-08-17 09:36:01 +000053{
Simon Glassfc4860c2015-01-19 22:16:10 -070054#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
Simon Glassc6577f72014-11-14 18:18:26 -070055 return in8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg);
wdenkaffae2b2002-08-17 09:36:01 +000056#else
Simon Glassfc4860c2015-01-19 22:16:10 -070057 int ofs = 0;
58
59 if (reg >= 128) {
60 ofs = 2;
61 reg -= 128;
62 }
63 out8(RTC_PORT_MC146818 + ofs, reg);
64
65 return in8(RTC_PORT_MC146818 + ofs + 1);
66#endif
wdenkaffae2b2002-08-17 09:36:01 +000067}
68
Bin Menged2ac0d2015-06-23 12:18:41 +080069static void mc146818_write8(int reg, uchar val)
wdenkaffae2b2002-08-17 09:36:01 +000070{
Simon Glassfc4860c2015-01-19 22:16:10 -070071#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
72 out8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg, val);
73#else
74 int ofs = 0;
75
76 if (reg >= 128) {
77 ofs = 2;
78 reg -= 128;
79 }
80 out8(RTC_PORT_MC146818 + ofs, reg);
81 out8(RTC_PORT_MC146818 + ofs + 1, val);
wdenkaffae2b2002-08-17 09:36:01 +000082#endif
Simon Glassfc4860c2015-01-19 22:16:10 -070083}
84
Bin Menged2ac0d2015-06-23 12:18:41 +080085static int mc146818_get(struct rtc_time *tmp)
86{
87 uchar sec, min, hour, mday, wday, mon, year;
88
89 /* here check if rtc can be accessed */
90 while ((mc146818_read8(RTC_CONFIG_A) & 0x80) == 0x80)
91 ;
92
93 sec = mc146818_read8(RTC_SECONDS);
94 min = mc146818_read8(RTC_MINUTES);
95 hour = mc146818_read8(RTC_HOURS);
96 mday = mc146818_read8(RTC_DATE_OF_MONTH);
97 wday = mc146818_read8(RTC_DAY_OF_WEEK);
98 mon = mc146818_read8(RTC_MONTH);
99 year = mc146818_read8(RTC_YEAR);
100#ifdef RTC_DEBUG
101 printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x hr: %02x min: %02x sec: %02x\n",
102 year, mon, mday, wday, hour, min, sec);
103 printf("Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
104 mc146818_read8(RTC_CONFIG_D) & 0x3f,
105 mc146818_read8(RTC_HOURS_ALARM),
106 mc146818_read8(RTC_MINUTES_ALARM),
107 mc146818_read8(RTC_SECONDS_ALARM));
108#endif
109 tmp->tm_sec = bcd2bin(sec & 0x7f);
110 tmp->tm_min = bcd2bin(min & 0x7f);
111 tmp->tm_hour = bcd2bin(hour & 0x3f);
112 tmp->tm_mday = bcd2bin(mday & 0x3f);
113 tmp->tm_mon = bcd2bin(mon & 0x1f);
114 tmp->tm_year = bcd2bin(year);
115 tmp->tm_wday = bcd2bin(wday & 0x07);
116
117 if (tmp->tm_year < 70)
118 tmp->tm_year += 2000;
119 else
120 tmp->tm_year += 1900;
121
122 tmp->tm_yday = 0;
123 tmp->tm_isdst = 0;
124#ifdef RTC_DEBUG
125 printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
126 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
127 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
128#endif
129
130 return 0;
131}
132
133static int mc146818_set(struct rtc_time *tmp)
134{
135#ifdef RTC_DEBUG
136 printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
137 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
138 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
139#endif
140 /* Disable the RTC to update the regs */
141 mc146818_write8(RTC_CONFIG_B, 0x82);
142
143 mc146818_write8(RTC_YEAR, bin2bcd(tmp->tm_year % 100));
144 mc146818_write8(RTC_MONTH, bin2bcd(tmp->tm_mon));
145 mc146818_write8(RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
146 mc146818_write8(RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
147 mc146818_write8(RTC_HOURS, bin2bcd(tmp->tm_hour));
148 mc146818_write8(RTC_MINUTES, bin2bcd(tmp->tm_min));
149 mc146818_write8(RTC_SECONDS, bin2bcd(tmp->tm_sec));
150
151 /* Enable the RTC to update the regs */
152 mc146818_write8(RTC_CONFIG_B, 0x02);
153
154 return 0;
155}
156
157static void mc146818_reset(void)
158{
159 /* Disable the RTC to update the regs */
160 mc146818_write8(RTC_CONFIG_B, 0x82);
161
162 /* Normal OP */
163 mc146818_write8(RTC_CONFIG_A, 0x20);
164 mc146818_write8(RTC_CONFIG_B, 0x00);
165 mc146818_write8(RTC_CONFIG_B, 0x00);
166
167 /* Enable the RTC to update the regs */
168 mc146818_write8(RTC_CONFIG_B, 0x02);
169}
170
171static void mc146818_init(void)
172{
173#if CLEAR_CMOS
174 int i;
175
176 rtc_write8(RTC_SECONDS_ALARM, 0);
177 rtc_write8(RTC_MINUTES_ALARM, 0);
178 rtc_write8(RTC_HOURS_ALARM, 0);
179 for (i = RTC_CONFIG_A; i < RTC_REG_SIZE; i++)
180 rtc_write8(i, 0);
181 printf("RTC: zeroing CMOS RAM\n");
182#endif
183
184 /* Setup the real time clock */
185 mc146818_write8(RTC_CONFIG_B, RTC_CONFIG_B_24H);
186 /* Setup the frequency it operates at */
187 mc146818_write8(RTC_CONFIG_A, RTC_CONFIG_A_REF_CLCK_32KHZ |
188 RTC_CONFIG_A_RATE_1024HZ);
189 /* Ensure all reserved bits are 0 in register D */
190 mc146818_write8(RTC_CONFIG_D, RTC_CONFIG_D_VALID_RAM_AND_TIME);
191
192 /* Clear any pending interrupts */
193 mc146818_read8(RTC_CONFIG_C);
194}
Simon Glass1bcb5c32015-10-18 15:55:29 -0600195#endif /* CONFIG_CMD_DATE */
Bin Menged2ac0d2015-06-23 12:18:41 +0800196
197#ifdef CONFIG_DM_RTC
198
199static int rtc_mc146818_get(struct udevice *dev, struct rtc_time *time)
200{
201 return mc146818_get(time);
202}
203
204static int rtc_mc146818_set(struct udevice *dev, const struct rtc_time *time)
205{
206 return mc146818_set((struct rtc_time *)time);
207}
208
209static int rtc_mc146818_reset(struct udevice *dev)
210{
211 mc146818_reset();
212
213 return 0;
214}
215
216static int rtc_mc146818_read8(struct udevice *dev, unsigned int reg)
217{
218 return mc146818_read8(reg);
219}
220
221static int rtc_mc146818_write8(struct udevice *dev, unsigned int reg, int val)
222{
223 mc146818_write8(reg, val);
224
225 return 0;
226}
227
Simon Glassb26eb882015-10-18 15:55:30 -0600228static int rtc_mc146818_probe(struct udevice *dev)
Bin Menged2ac0d2015-06-23 12:18:41 +0800229{
230 mc146818_init();
231
232 return 0;
233}
234
235static const struct rtc_ops rtc_mc146818_ops = {
236 .get = rtc_mc146818_get,
237 .set = rtc_mc146818_set,
238 .reset = rtc_mc146818_reset,
239 .read8 = rtc_mc146818_read8,
240 .write8 = rtc_mc146818_write8,
241};
242
243static const struct udevice_id rtc_mc146818_ids[] = {
244 { .compatible = "motorola,mc146818" },
245 { }
246};
247
248U_BOOT_DRIVER(rtc_mc146818) = {
249 .name = "rtc_mc146818",
250 .id = UCLASS_RTC,
251 .of_match = rtc_mc146818_ids,
Simon Glassb26eb882015-10-18 15:55:30 -0600252 .probe = rtc_mc146818_probe,
Bin Menged2ac0d2015-06-23 12:18:41 +0800253 .ops = &rtc_mc146818_ops,
254};
255
256#else /* !CONFIG_DM_RTC */
257
258int rtc_get(struct rtc_time *tmp)
259{
260 return mc146818_get(tmp);
261}
262
263int rtc_set(struct rtc_time *tmp)
264{
265 return mc146818_set(tmp);
266}
267
268void rtc_reset(void)
269{
270 mc146818_reset();
271}
272
273int rtc_read8(int reg)
274{
275 return mc146818_read8(reg);
276}
277
278void rtc_write8(int reg, uchar val)
279{
280 mc146818_write8(reg, val);
281}
282
Simon Glassfc4860c2015-01-19 22:16:10 -0700283u32 rtc_read32(int reg)
284{
285 u32 value = 0;
286 int i;
287
288 for (i = 0; i < sizeof(value); i++)
289 value |= rtc_read8(reg + i) << (i << 3);
290
291 return value;
292}
293
294void rtc_write32(int reg, u32 value)
295{
296 int i;
297
298 for (i = 0; i < sizeof(value); i++)
299 rtc_write8(reg + i, (value >> (i << 3)) & 0xff);
300}
wdenkaffae2b2002-08-17 09:36:01 +0000301
Simon Glassc6577f72014-11-14 18:18:26 -0700302void rtc_init(void)
303{
Bin Menged2ac0d2015-06-23 12:18:41 +0800304 mc146818_init();
Simon Glassc6577f72014-11-14 18:18:26 -0700305}
Bin Menged2ac0d2015-06-23 12:18:41 +0800306
307#endif /* CONFIG_DM_RTC */