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rtc.h

#ifndef __RTC_H__
#define __RTC_H__

#ifdef CONFIG_ETRAX_DS1302
   /* Dallas DS1302 clock/calendar register numbers. */
#  define RTC_SECONDS      0
#  define RTC_MINUTES      1
#  define RTC_HOURS        2
#  define RTC_DAY_OF_MONTH 3
#  define RTC_MONTH        4
#  define RTC_WEEKDAY      5
#  define RTC_YEAR         6
#  define RTC_CONTROL      7

   /* Bits in CONTROL register. */
#  define RTC_CONTROL_WRITEPROTECT  0x80
#  define RTC_TRICKLECHARGER        8

  /* Bits in TRICKLECHARGER register TCS TCS TCS TCS DS DS RS RS. */
#  define RTC_TCR_PATTERN     0xA0  /* 1010xxxx */
#  define RTC_TCR_1DIOD       0x04  /* xxxx01xx */
#  define RTC_TCR_2DIOD       0x08  /* xxxx10xx */
#  define RTC_TCR_DISABLED    0x00  /* xxxxxx00 Disabled */
#  define RTC_TCR_2KOHM       0x01  /* xxxxxx01 2KOhm */
#  define RTC_TCR_4KOHM       0x02  /* xxxxxx10 4kOhm */
#  define RTC_TCR_8KOHM       0x03  /* xxxxxx11 8kOhm */

#elif defined(CONFIG_ETRAX_PCF8563)
   /* I2C bus slave registers. */
#  define RTC_I2C_READ        0xa3
#  define RTC_I2C_WRITE       0xa2

   /* Phillips PCF8563 registers. */
#  define RTC_CONTROL1        0x00        /* Control/Status register 1. */
#  define RTC_CONTROL2        0x01        /* Control/Status register 2. */
#  define RTC_CLOCKOUT_FREQ   0x0d        /* CLKOUT frequency. */
#  define RTC_TIMER_CONTROL   0x0e        /* Timer control. */
#  define RTC_TIMER_CNTDOWN   0x0f        /* Timer countdown. */

   /* BCD encoded clock registers. */
#  define RTC_SECONDS         0x02
#  define RTC_MINUTES         0x03
#  define RTC_HOURS           0x04
#  define RTC_DAY_OF_MONTH    0x05
#  define RTC_WEEKDAY         0x06  /* Not coded in BCD! */
#  define RTC_MONTH           0x07
#  define RTC_YEAR            0x08
#  define RTC_MINUTE_ALARM    0x09
#  define RTC_HOUR_ALARM      0x0a
#  define RTC_DAY_ALARM       0x0b
#  define RTC_WEEKDAY_ALARM 0x0c

#endif

#ifdef CONFIG_ETRAX_DS1302
extern unsigned char ds1302_readreg(int reg);
extern void ds1302_writereg(int reg, unsigned char val);
extern int ds1302_init(void);
#  define CMOS_READ(x) ds1302_readreg(x)
#  define CMOS_WRITE(val,reg) ds1302_writereg(reg,val)
#  define RTC_INIT() ds1302_init()
#elif defined(CONFIG_ETRAX_PCF8563)
extern unsigned char pcf8563_readreg(int reg);
extern void pcf8563_writereg(int reg, unsigned char val);
extern int pcf8563_init(void);
#  define CMOS_READ(x) pcf8563_readreg(x)
#  define CMOS_WRITE(val,reg) pcf8563_writereg(reg,val)
#  define RTC_INIT() pcf8563_init()
#else
  /* No RTC configured so we shouldn't try to access any. */
#  define CMOS_READ(x) 42
#  define CMOS_WRITE(x,y)
#  define RTC_INIT() (-1)
#endif

/*
 * The struct used to pass data via the following ioctl. Similar to the
 * struct tm in <time.h>, but it needs to be here so that the kernel
 * source is self contained, allowing cross-compiles, etc. etc.
 */
00082 struct rtc_time {
      int tm_sec;
      int tm_min;
      int tm_hour;
      int tm_mday;
      int tm_mon;
      int tm_year;
      int tm_wday;
      int tm_yday;
      int tm_isdst;
};

/* ioctl() calls that are permitted to the /dev/rtc interface. */
#define RTC_MAGIC 'p'
/* Read RTC time. */
#define RTC_RD_TIME           _IOR(RTC_MAGIC, 0x09, struct rtc_time)
/* Set RTC time. */
#define RTC_SET_TIME          _IOW(RTC_MAGIC, 0x0a, struct rtc_time)
#define RTC_SET_CHARGE        _IOW(RTC_MAGIC, 0x0b, int)
/* Voltage low detector */
#define RTC_VL_READ           _IOR(RTC_MAGIC, 0x13, int)
/* Clear voltage low information */
#define RTC_VL_CLR            _IO(RTC_MAGIC, 0x14)
#define RTC_MAX_IOCTL 0x14

#endif /* __RTC_H__ */

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