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 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22#include <config.h>
  23#include <common.h>
  24#include <rtc.h>
  25#include <asm/io.h>
  26
  27struct ftrtc010 {
  28        unsigned int sec;               /* 0x00 */
  29        unsigned int min;               /* 0x04 */
  30        unsigned int hour;              /* 0x08 */
  31        unsigned int day;               /* 0x0c */
  32        unsigned int alarm_sec;         /* 0x10 */
  33        unsigned int alarm_min;         /* 0x14 */
  34        unsigned int alarm_hour;        /* 0x18 */
  35        unsigned int record;            /* 0x1c */
  36        unsigned int cr;                /* 0x20 */
  37        unsigned int wsec;              /* 0x24 */
  38        unsigned int wmin;              /* 0x28 */
  39        unsigned int whour;             /* 0x2c */
  40        unsigned int wday;              /* 0x30 */
  41        unsigned int intr;              /* 0x34 */
  42        unsigned int div;               /* 0x38 */
  43        unsigned int rev;               /* 0x3c */
  44};
  45
  46/*
  47 * RTC Control Register
  48 */
  49#define FTRTC010_CR_ENABLE              (1 << 0)
  50#define FTRTC010_CR_INTERRUPT_SEC       (1 << 1)        /* per second irq */
  51#define FTRTC010_CR_INTERRUPT_MIN       (1 << 2)        /* per minute irq */
  52#define FTRTC010_CR_INTERRUPT_HR        (1 << 3)        /* per hour   irq */
  53#define FTRTC010_CR_INTERRUPT_DAY       (1 << 4)        /* per day    irq */
  54
  55static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
  56
  57static void ftrtc010_enable(void)
  58{
  59        writel(FTRTC010_CR_ENABLE, &rtc->cr);
  60}
  61
  62/*
  63 * return current time in seconds
  64 */
  65static unsigned long ftrtc010_time(void)
  66{
  67        unsigned long day;
  68        unsigned long hour;
  69        unsigned long minute;
  70        unsigned long second;
  71        unsigned long second2;
  72
  73        do {
  74                second  = readl(&rtc->sec);
  75                day     = readl(&rtc->day);
  76                hour    = readl(&rtc->hour);
  77                minute  = readl(&rtc->min);
  78                second2 = readl(&rtc->sec);
  79        } while (second != second2);
  80
  81        return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
  82}
  83
  84/*
  85 * Get the current time from the RTC
  86 */
  87
  88int rtc_get(struct rtc_time *tmp)
  89{
  90        unsigned long now;
  91
  92        debug("%s(): record register: %x\n",
  93              __func__, readl(&rtc->record));
  94
  95#ifdef CONFIG_FTRTC010_PCLK
  96        now = (ftrtc010_time() + readl(&rtc->record)) / RTC_DIV_COUNT;
  97#else /* CONFIG_FTRTC010_EXTCLK */
  98        now = ftrtc010_time() + readl(&rtc->record);
  99#endif
 100
 101        to_tm(now, tmp);
 102
 103        return 0;
 104}
 105
 106/*
 107 * Set the RTC
 108 */
 109int rtc_set(struct rtc_time *tmp)
 110{
 111        unsigned long new;
 112        unsigned long now;
 113
 114        debug("%s(): DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
 115              __func__,
 116              tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
 117              tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 118
 119        new = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour,
 120                     tmp->tm_min, tmp->tm_sec);
 121
 122        now = ftrtc010_time();
 123
 124        debug("%s(): write %lx to record register\n", __func__, new - now);
 125
 126        writel(new - now, &rtc->record);
 127
 128        return 0;
 129}
 130
 131void rtc_reset(void)
 132{
 133        debug("%s()\n", __func__);
 134        ftrtc010_enable();
 135}
 136