bsp/drv/dev/rtc/mc146818.c

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This source file includes following definitions.
mc_read
mc_write
mc146818_gettime
mc146818_settime
mc146818_init
   1 /*-
   2  * Copyright (c) 2005-2009, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 
  30 /*
  31  * mc146818.c - mc146818 and compatible RTC
  32  */
  33 
  34 #include <sys/time.h>
  35 #include <sys/ioctl.h>
  36 
  37 #include <driver.h>
  38 #include <rtc.h>
  39 
  40 
  41 #define RTC_INDEX       (CONFIG_MC146818_BASE + 0)
  42 #define RTC_DATA        (CONFIG_MC146818_BASE + 1)
  43 
  44 #define RTC_SEC         0x00
  45 #define RTC_MIN         0x02
  46 #define RTC_HOUR        0x04
  47 #define RTC_DOW         0x06    /* day of week */
  48 #define RTC_DAY         0x07
  49 #define RTC_MON         0x08
  50 #define RTC_YEAR        0x09
  51 #define RTC_STS_A       0x0a
  52 #define RTC_UIP           0x80
  53 #define RTC_STS_B       0x0b
  54 #define RTC_BCD           0x04
  55 
  56 static int      mc146818_init(struct driver *);
  57 static int      mc146818_gettime(void *, struct timeval *);
  58 static int      mc146818_settime(void *, struct timeval *);
  59 
  60 
  61 struct driver mc146818_driver = {
  62         /* name */      "mc146818",
  63         /* devops */    NULL,
  64         /* devsz */     0,
  65         /* flags */     0,
  66         /* probe */     NULL,
  67         /* init */      mc146818_init,
  68         /* shutdown */  NULL,
  69 };
  70 
  71 struct rtc_ops mc146818_ops = {
  72         /* gettime */   mc146818_gettime,
  73         /* settime */   mc146818_settime,
  74 };
  75 
  76 static u_char
  77 mc_read(u_char index)
  78 {
  79         u_char val;
  80         int s;
  81 
  82         s = splhigh();
  83         bus_write_8(RTC_INDEX, index);
  84         val = bus_read_8(RTC_DATA);
  85         splx(s);
  86         return val;
  87 }
  88 
  89 #if 0
  90 static void
  91 mc_write(u_char index, u_char val)
  92 {
  93         int s;
  94 
  95         s = splhigh();
  96         bus_write_8(RTC_INDEX, index);
  97         bus_write_8(RTC_DATA, val);
  98         splx(s);
  99 }
 100 #endif
 101 
 102 static int
 103 mc146818_gettime(void *aux, struct timeval *tv)
 104 {
 105         struct clock_ymdhms cy;
 106         int i;
 107 
 108         /* Wait until data ready */
 109         for (i = 0; i < 1000000; i++)
 110                 if (!(mc_read(RTC_STS_A) & RTC_UIP))
 111                         break;
 112 
 113         cy.nsec = 0;
 114         cy.sec = mc_read(RTC_SEC);
 115         cy.min = mc_read(RTC_MIN);
 116         cy.hour = mc_read(RTC_HOUR);
 117         cy.dow = mc_read(RTC_DOW);
 118         cy.day = mc_read(RTC_DAY);
 119         cy.mon = mc_read(RTC_MON);
 120         cy.year = mc_read(RTC_YEAR);
 121 
 122         if (!(mc_read(RTC_STS_B) & RTC_BCD)) {
 123                 cy.sec = FROMBCD(cy.sec);
 124                 cy.min = FROMBCD(cy.min);
 125                 cy.hour = FROMBCD(cy.hour);
 126                 cy.day = FROMBCD(cy.day);
 127                 cy.mon = FROMBCD(cy.mon);
 128                 cy.year = FROMBCD(cy.year);
 129         }
 130         if (cy.year < 80)
 131                 cy.year += 2000;
 132         else
 133                 cy.year += 1900;
 134 #ifdef DEBUG
 135         printf("rtc: system time was %d/%d/%d %d:%d:%d\n",
 136                 cy.year, cy.mon, cy.day, cy.hour, cy.min, cy.sec);
 137 #endif
 138         tv->tv_usec = 0;
 139         tv->tv_sec = rtc_ymdhms_to_secs(&cy);
 140         return 0;
 141 }
 142 
 143 static int
 144 mc146818_settime(void *aux, struct timeval *ts)
 145 {
 146         return 0;
 147 }
 148 
 149 static int
 150 mc146818_init(struct driver *self)
 151 {
 152 
 153         rtc_attach(&mc146818_ops, NULL);
 154         return 0;
 155 }
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root/bsp/drv/dev/rtc/mc146818.c

DEFINITIONS
