uboot-phytec

/*

 * ds1302.c - Support for the Dallas Semiconductor DS1302 Timekeeping Chip

 *

 * Rex G. Feany <rfeany@zumanetworks.com>

 *

 */

​

#include <common.h>

#include <command.h>

#include <rtc.h>

​

#if defined(CONFIG_CMD_DATE)

​

/* GPP Pins */

#define DATA        0x200

#define SCLK        0x400

#define RST     0x800

​

/* Happy Fun Defines(tm) */

#define RESET       rtc_go_low(RST), rtc_go_low(SCLK)

#define N_RESET     rtc_go_high(RST), rtc_go_low(SCLK)

​

#define CLOCK_HIGH  rtc_go_high(SCLK)

#define CLOCK_LOW   rtc_go_low(SCLK)

​

#define DATA_HIGH   rtc_go_high(DATA)

#define DATA_LOW    rtc_go_low(DATA)

#define DATA_READ   (GTREGREAD(GPP_VALUE) & DATA)

​

#undef RTC_DEBUG

​

#ifdef RTC_DEBUG

#  define DPRINTF(x,args...)    printf("ds1302: " x , ##args)

static inline void DUMP(const char *ptr, int num)

{

    while (num--) printf("%x ", *ptr++);

    printf("]\n");

}

#else

#  define DPRINTF(x,args...)

#  define DUMP(ptr, num)

#endif

​

/* time data format for DS1302 */

struct ds1302_st

{

    unsigned char CH:1;     /* clock halt 1=stop 0=start */

    unsigned char sec10:3;

    unsigned char sec:4;

​

    unsigned char zero0:1;

    unsigned char min10:3;

    unsigned char min:4;

​

    unsigned char fmt:1;        /* 1=12 hour 0=24 hour */

    unsigned char zero1:1;

    unsigned char hr10:2;   /* 10 (0-2) or am/pm (am/pm, 0-1) */

    unsigned char hr:4;

​

    unsigned char zero2:2;

    unsigned char date10:2;

    unsigned char date:4;

​

    unsigned char zero3:3;

    unsigned char month10:1;

    unsigned char month:4;

​

    unsigned char zero4:5;

    unsigned char day:3;        /* day of week */

​

    unsigned char year10:4;

    unsigned char year:4;

​

    unsigned char WP:1;     /* write protect 1=protect 0=unprot */

    unsigned char zero5:7;

};

​

static int ds1302_initted=0;

​

/* Pin control */

static inline void

rtc_go_high(unsigned int mask)

{

    unsigned int f = GTREGREAD(GPP_VALUE) | mask;

​

    GT_REG_WRITE(GPP_VALUE, f);

}

​

static inline void

rtc_go_low(unsigned int mask)

{

    unsigned int f = GTREGREAD(GPP_VALUE) & ~mask;