arch/m32r/include/asm/rtc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __RTC_H__
   3 #define __RTC_H__
   4
   5    /* Dallas DS1302 clock/calendar register numbers. */
   6 #  define RTC_SECONDS      0
   7 #  define RTC_MINUTES      1
   8 #  define RTC_HOURS        2
   9 #  define RTC_DAY_OF_MONTH 3
  10 #  define RTC_MONTH        4
  11 #  define RTC_WEEKDAY      5
  12 #  define RTC_YEAR         6
  13 #  define RTC_CONTROL      7
  14
  15    /* Bits in CONTROL register. */
  16 #  define RTC_CONTROL_WRITEPROTECT      0x80
  17 #  define RTC_TRICKLECHARGER            8
  18
  19   /* Bits in TRICKLECHARGER register TCS TCS TCS TCS DS DS RS RS. */
  20 #  define RTC_TCR_PATTERN       0xA0    /* 1010xxxx */
  21 #  define RTC_TCR_1DIOD         0x04    /* xxxx01xx */
  22 #  define RTC_TCR_2DIOD         0x08    /* xxxx10xx */
  23 #  define RTC_TCR_DISABLED      0x00    /* xxxxxx00 Disabled */
  24 #  define RTC_TCR_2KOHM         0x01    /* xxxxxx01 2KOhm */
  25 #  define RTC_TCR_4KOHM         0x02    /* xxxxxx10 4kOhm */
  26 #  define RTC_TCR_8KOHM         0x03    /* xxxxxx11 8kOhm */
  27
  28 #ifdef CONFIG_DS1302
  29 extern unsigned char ds1302_readreg(int reg);
  30 extern void ds1302_writereg(int reg, unsigned char val);
  31 extern int ds1302_init(void);
  32 #  define CMOS_READ(x) ds1302_readreg(x)
  33 #  define CMOS_WRITE(val,reg) ds1302_writereg(reg,val)
  34 #  define RTC_INIT() ds1302_init()
  35 #else
  36   /* No RTC configured so we shouldn't try to access any. */
  37 #  define CMOS_READ(x) 42
  38 #  define CMOS_WRITE(x,y)
  39 #  define RTC_INIT() (-1)
  40 #endif
  41
  42 /*
  43  * The struct used to pass data via the following ioctl. Similar to the
  44  * struct tm in <time.h>, but it needs to be here so that the kernel
  45  * source is self contained, allowing cross-compiles, etc. etc.
  46  */
  47 struct rtc_time {
  48         int tm_sec;
  49         int tm_min;
  50         int tm_hour;
  51         int tm_mday;
  52         int tm_mon;
  53         int tm_year;
  54         int tm_wday;
  55         int tm_yday;
  56         int tm_isdst;
  57 };
  58
  59 /* ioctl() calls that are permitted to the /dev/rtc interface. */
  60 #define RTC_MAGIC 'p'
  61 #define RTC_RD_TIME             _IOR(RTC_MAGIC, 0x09, struct rtc_time)  /* Read RTC time. */
  62 #define RTC_SET_TIME            _IOW(RTC_MAGIC, 0x0a, struct rtc_time)  /* Set RTC time. */
  63 #define RTC_SET_CHARGE          _IOW(RTC_MAGIC, 0x0b, int)
  64 #define RTC_MAX_IOCTL 0x0b
  65
  66 #endif /* __RTC_H__ */