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//==========================================================================

//

//      lpc2xxx_wallclock.cxx

//

//      Wallclock implementation for LPC2xxx and LPC17xx CPUs

//

//==========================================================================

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//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>

// Contributors:  Uwe Kindler <uwe_kindler@web.de, ilijak

// Date:          2007-06-19

// Purpose:       Wallclock driver for LPC2xxx and LPC17xx CPUs

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/hal.h>

#include <pkgconf/wallclock.h>

#include <pkgconf/devices_wallclock_arm_lpc2xxx.h>

#include <cyg/hal/hal_io.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/infra/cyg_type.h>

#include <cyg/io/wallclock.hxx>

#include <cyg/io/wallclock/wallclock.inl>

//

// The LPC2xxx variant HAL provides the CPU clock and the peripheral divider

// VPBDIV. The LPC24xx variant HAL provides the RTC clock directly be means

// of CYGNUM_HAL_ARM_LPC24XX_RTC_CLK.

//

#ifdef CYGNUM_HAL_ARM_LPC2XXX_VPBDIV

#define LPC2XXX_RTC_CLK (CYGNUM_HAL_ARM_LPC2XXX_CLOCK_SPEED / \

                         CYGNUM_HAL_ARM_LPC2XXX_VPBDIV)

#endif // CYGNUM_HAL_ARM_LPC2XXX_VPBDIV

#ifdef CYGNUM_HAL_ARM_LPC24XX_RTC_CLK

#define LPC2XXX_RTC_CLK (CYGNUM_HAL_ARM_LPC24XX_RTC_CLK)

#endif // CYGNUM_HAL_ARM_LPC2XXX_VPBDIV

#define CYGNUM_HAL_ARM_LPC2XXX_RTCDEV_PREINT                     \

        ((LPC2XXX_RTC_CLK / 32768) - 1)

#define CYGNUM_HAL_ARM_LPC2XXX_RTCDEV_PREFRAC                    \

        (LPC2XXX_RTC_CLK -                                       \

        ((CYGNUM_HAL_ARM_LPC2XXX_RTCDEV_PREINT + 1) * 32768))

/*

 * I don't like to write LOTS OF CAPITALIZED TEXT.

 * This code is intended for LPC2xxx processors _only_, so there is nothing

 * wrong with accessing this device directly without using the HAL macros.

 */

struct time {

  volatile cyg_uint32 sec;

  volatile cyg_uint32 min;

  volatile cyg_uint32 hour;

  volatile cyg_uint32 dom;

  volatile cyg_uint32 dow;

  volatile cyg_uint32 doy;

  volatile cyg_uint32 month;

  volatile cyg_uint32 year;

};

struct rtcdev {

  volatile cyg_uint32 ilr;

  volatile cyg_uint32 ctc;

  volatile cyg_uint32 ccr;

  volatile cyg_uint32 ciir;

  volatile cyg_uint32 amr;

  volatile cyg_uint32 ctime[3];

  struct time time;

  cyg_uint32 dummy[8];

  struct time alarm;

#ifndef CYGHWR_HAL_LPC_RTC_32768HZ

  volatile cyg_uint32 preint;

  volatile cyg_uint32 prefrac;

#endif

};

static struct rtcdev * const rtc =

  (struct rtcdev *) CYGARC_HAL_LPC2XXX_REG_RTC_BASE;

void

Cyg_WallClock::init_hw_seconds(void)

{

  /* halt clock, disable interrupts, disable alarm */

  rtc->ccr  = 0x2;

  rtc->ciir = 0x0;

  rtc->amr  = 0xf;

  // initialize prescaler - if the RTC id driven by an external 32.768 crystal

  // clock then initializing the prescaler is not required but writing the

  // registers here should not cause any trouble

#ifndef CYGHWR_HAL_LPC_RTC_32768HZ

  rtc->preint  = CYGNUM_HAL_ARM_LPC2XXX_RTCDEV_PREINT;

  rtc->prefrac = CYGNUM_HAL_ARM_LPC2XXX_RTCDEV_PREFRAC;

#endif

#ifndef CYGSEM_WALLCLOCK_SET_GET_MODE

  /* reset time to the Unix Epoch */

  rtc->time.year  = 1970;

  rtc->time.month = 1;

  rtc->time.dom   = 1;

  rtc->time.doy   = 1;

  rtc->time.dow   = 4;

  rtc->time.hour  = 0;

  rtc->time.min   = 0;

  rtc->time.sec   = 0;

#endif

  /* reset alarm */

  rtc->alarm.year = rtc->alarm.month = rtc->alarm.dom = rtc->alarm.doy =

    rtc->alarm.dow = rtc->alarm.hour = rtc->alarm.min =

    rtc->alarm.sec = 0;

  /* start clock */

  rtc->ccr = 0x1;

}

cyg_uint32

Cyg_WallClock::get_hw_seconds(void)

{

  return _simple_mktime(rtc->time.year,

                        rtc->time.month,

                        rtc->time.dom,

                        rtc->time.hour,

                        rtc->time.min,

                        rtc->time.sec);

}

#ifdef CYGSEM_WALLCLOCK_SET_GET_MODE

void

Cyg_WallClock::set_hw_seconds(cyg_uint32 secs)

{

  cyg_uint32 year, month, dom, hour, min, sec;

  /* halt clock, reset counter */

  rtc->ccr = 0x2;

  /* set time */

  _simple_mkdate(secs, &year, &month, &dom, &hour, &min, &sec);

  rtc->time.year  = year;

  rtc->time.month = month;

  rtc->time.dom   = dom;

  rtc->time.hour  = hour;

  rtc->time.min   = min;

  rtc->time.sec   = sec;

  /* restart clock */

  rtc->ccr = 0x1;

}

#endif // CYGSEM_WALLCLOCK_SET_GET_MODE

//==========================================================================

// EOF lpc2xxx_wallclock.cxx