LXR uboot/drivers/rtc/pl031.c

   1/*
   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 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <command.h>
  12#include <rtc.h>
  13
  14#if defined(CONFIG_CMD_DATE)
  15
  16#ifndef CONFIG_SYS_RTC_PL031_BASE
  17#error CONFIG_SYS_RTC_PL031_BASE is not defined!
  18#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) \
  35                        (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)) = (val))
  36#define RTC_READ_REG(addr)      \
  37                        (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)))
  38
  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*/
  62int rtc_set(struct rtc_time *tmp)
  63{
  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");
  71                return -1;
  72        }
  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);
  79
  80        return -1;
  81}
  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
 110