LXR uboot/drivers/rtc/ftrtc010.c

   1/*
   2 * Faraday FTRTC010 Real Time Clock
   3 *
   4 * (C) Copyright 2009 Faraday Technology
   5 * Po-Yu Chuang <ratbert@faraday-tech.com>
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <config.h>
  11#include <common.h>
  12#include <rtc.h>
  13#include <asm/io.h>
  14
  15struct ftrtc010 {
  16        unsigned int sec;               /* 0x00 */
  17        unsigned int min;               /* 0x04 */
  18        unsigned int hour;              /* 0x08 */
  19        unsigned int day;               /* 0x0c */
  20        unsigned int alarm_sec;         /* 0x10 */
  21        unsigned int alarm_min;         /* 0x14 */
  22        unsigned int alarm_hour;        /* 0x18 */
  23        unsigned int record;            /* 0x1c */
  24        unsigned int cr;                /* 0x20 */
  25        unsigned int wsec;              /* 0x24 */
  26        unsigned int wmin;              /* 0x28 */
  27        unsigned int whour;             /* 0x2c */
  28        unsigned int wday;              /* 0x30 */
  29        unsigned int intr;              /* 0x34 */
  30        unsigned int div;               /* 0x38 */
  31        unsigned int rev;               /* 0x3c */
  32};
  33
  34/*
  35 * RTC Control Register
  36 */
  37#define FTRTC010_CR_ENABLE              (1 << 0)
  38#define FTRTC010_CR_INTERRUPT_SEC       (1 << 1)        /* per second irq */
  39#define FTRTC010_CR_INTERRUPT_MIN       (1 << 2)        /* per minute irq */
  40#define FTRTC010_CR_INTERRUPT_HR        (1 << 3)        /* per hour   irq */
  41#define FTRTC010_CR_INTERRUPT_DAY       (1 << 4)        /* per day    irq */
  42
  43static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
  44
  45static void ftrtc010_enable(void)
  46{
  47        writel(FTRTC010_CR_ENABLE, &rtc->cr);
  48}
  49
  50/*
  51 * return current time in seconds
  52 */
  53static unsigned long ftrtc010_time(void)
  54{
  55        unsigned long day;
  56        unsigned long hour;
  57        unsigned long minute;
  58        unsigned long second;
  59        unsigned long second2;
  60
  61        do {
  62                second  = readl(&rtc->sec);
  63                day     = readl(&rtc->day);
  64                hour    = readl(&rtc->hour);
  65                minute  = readl(&rtc->min);
  66                second2 = readl(&rtc->sec);
  67        } while (second != second2);
  68
  69        return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
  70}
  71
  72/*
  73 * Get the current time from the RTC
  74 */
  75
  76int rtc_get(struct rtc_time *tmp)
  77{
  78        unsigned long now;
  79
  80        debug("%s(): record register: %x\n",
  81              __func__, readl(&rtc->record));
  82
  83#ifdef CONFIG_FTRTC010_PCLK
  84        now = (ftrtc010_time() + readl(&rtc->record)) / RTC_DIV_COUNT;
  85#else /* CONFIG_FTRTC010_EXTCLK */
  86        now = ftrtc010_time() + readl(&rtc->record);
  87#endif
  88
  89        rtc_to_tm(now, tmp);
  90
  91        return 0;
  92}
  93
  94/*
  95 * Set the RTC
  96 */
  97int rtc_set(struct rtc_time *tmp)
  98{
  99        unsigned long new;
 100        unsigned long now;
 101
 102        debug("%s(): DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 103              __func__,
 104              tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 105              tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 106
 107        new = rtc_mktime(tmp);
 108
 109        now = ftrtc010_time();
 110
 111        debug("%s(): write %lx to record register\n", __func__, new - now);
 112
 113        writel(new - now, &rtc->record);
 114
 115        return 0;
 116}
 117
 118void rtc_reset(void)
 119{
 120        debug("%s()\n", __func__);
 121        ftrtc010_enable();
 122}
 123