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Gururaja Hebbar K R535cfa42008-08-25 11:30:29 +02001/*
2 * (C) Copyright 2008
3 * Gururaja Hebbar gururajakr@sanyo.co.in
4 *
5 * reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c
6 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02007 * SPDX-License-Identifier: GPL-2.0+
Gururaja Hebbar K R535cfa42008-08-25 11:30:29 +02008 */
9
10#include <common.h>
11#include <command.h>
12#include <rtc.h>
13
14#if defined(CONFIG_CMD_DATE)
15
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020016#ifndef CONFIG_SYS_RTC_PL031_BASE
17#error CONFIG_SYS_RTC_PL031_BASE is not defined!
Gururaja Hebbar K R535cfa42008-08-25 11:30:29 +020018#endif
19
20/*
21 * Register definitions
22 */
23#define RTC_DR 0x00 /* Data read register */
24#define RTC_MR 0x04 /* Match register */
25#define RTC_LR 0x08 /* Data load register */
26#define RTC_CR 0x0c /* Control register */
27#define RTC_IMSC 0x10 /* Interrupt mask and set register */
28#define RTC_RIS 0x14 /* Raw interrupt status register */
29#define RTC_MIS 0x18 /* Masked interrupt status register */
30#define RTC_ICR 0x1c /* Interrupt clear register */
31
32#define RTC_CR_START (1 << 0)
33
34#define RTC_WRITE_REG(addr, val) \
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020035 (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)) = (val))
Gururaja Hebbar K R535cfa42008-08-25 11:30:29 +020036#define RTC_READ_REG(addr) \
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020037 (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)))
Gururaja Hebbar K R535cfa42008-08-25 11:30:29 +020038
39static int pl031_initted = 0;
40
41/* Enable RTC Start in Control register*/
42void rtc_init(void)
43{
44 RTC_WRITE_REG(RTC_CR, RTC_CR_START);
45
46 pl031_initted = 1;
47}
48
49/*
50 * Reset the RTC. We set the date back to 1970-01-01.
51 */
52void rtc_reset(void)
53{
54 RTC_WRITE_REG(RTC_LR, 0x00);
55 if(!pl031_initted)
56 rtc_init();
57}
58
59/*
60 * Set the RTC
61*/
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +020062int rtc_set(struct rtc_time *tmp)
Gururaja Hebbar K R535cfa42008-08-25 11:30:29 +020063{
64 unsigned long tim;
65
66 if(!pl031_initted)
67 rtc_init();
68
69 if (tmp == NULL) {
70 puts("Error setting the date/time\n");
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +020071 return -1;
Gururaja Hebbar K R535cfa42008-08-25 11:30:29 +020072 }
73
74 /* Calculate number of seconds this incoming time represents */
75 tim = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
76 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
77
78 RTC_WRITE_REG(RTC_LR, tim);
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +020079
80 return -1;
Gururaja Hebbar K R535cfa42008-08-25 11:30:29 +020081}
82
83/*
84 * Get the current time from the RTC
85 */
86int rtc_get(struct rtc_time *tmp)
87{
88 ulong tim;
89
90 if(!pl031_initted)
91 rtc_init();
92
93 if (tmp == NULL) {
94 puts("Error getting the date/time\n");
95 return -1;
96 }
97
98 tim = RTC_READ_REG(RTC_DR);
99
100 to_tm (tim, tmp);
101
102 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
103 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
104 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
105
106 return 0;
107}
108
109#endif