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/*
* Copyright (c) 2009 NVIDIA Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NVIDIA Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "max8907b.h"
#include "max8907b_rtc.h"
#include "max8907b_i2c.h"
#include "max8907b_reg.h"
/**
* The Maxim 8907B does not have an RTC that simply counts
* seconds from some time t0 (as defined by the OS API).
* Instead, this RTC contains several BCD (Binary Coded Decimal)
* registers, including: seconds, minutes, hours, days, day of
* week, date, etc... These registers account for leap year and
* the various days of the month as well.
*
* Since the OS interpretation of seconds to a particular
* date/time from some OS-defined t0 is unknown at this level of
* the implementation, it is not possible to translate the given
* seconds into these registers (at least, not without a
* dependency on some OS-specific information).
*
* Therefore, this implementation contains a static variable
* (RtcDays) which is derived from the number of seconds given
* when Max8907bRtcCountWrite() is called. The seconds, minutes
* and hours are then programmed to the RTC and used to keep
* track of the current time within the day.
*
* TO DO: Increment the day whenever it rolls over (requires
* handling an interrupt at midnight each day).
*/
#define MAX8907B_SECONDS_PER_DAY (60*60*24)
#define MAX8907B_SECONDS_PER_HOUR (60*60)
#define MAX8907B_SECONDS_PER_MINUTE (60)
static NvBool bRtcNotInitialized = NV_TRUE;
static NvU32 RtcDays = 0;
NvBool
Max8907bRtcCountRead(
NvOdmPmuDeviceHandle hDevice,
NvU32* Count)
{
NvU32 data = 0;
NvU32 BcdHours, BcdMinutes, BcdSeconds;
NvU32 Hours, Minutes, Seconds;
if (Max8907bRtcWasStartUpFromNoPower(hDevice) && bRtcNotInitialized)
{
Max8907bRtcCountWrite(hDevice, 0);
*Count = 0;
}
else
{
if (Max8907bRtcI2cReadTime(hDevice, MAX8907B_RTC_SEC, &data))
{
BcdHours = (data >> 8) & 0xFF;
BcdMinutes = (data >> 16) & 0xFF;
BcdSeconds = (data >> 24) & 0xFF;
Hours = ((BcdHours & 0xF0)>>4)*10 + (BcdHours & 0xF);
Minutes = ((BcdMinutes & 0xF0)>>4)*10 + (BcdMinutes & 0xF);
Seconds = ((BcdSeconds & 0xF0)>>4)*10 + (BcdSeconds & 0xF);
*Count = (Hours * MAX8907B_SECONDS_PER_HOUR) +
(Minutes * MAX8907B_SECONDS_PER_MINUTE) + Seconds;
}
else
{
NvOdmOsDebugPrintf("Max8907bRtcCountRead() error. ");
return NV_FALSE;
}
}
return NV_TRUE;
}
NvBool
Max8907bRtcAlarmCountRead(
NvOdmPmuDeviceHandle hDevice,
NvU32* Count)
{
return NV_FALSE;
}
NvBool
Max8907bRtcCountWrite(
NvOdmPmuDeviceHandle hDevice,
NvU32 Count)
{
NvU32 Hours, Minutes, Seconds;
NvU32 BcdHours, BcdMinutes, BcdSeconds;
NvU32 data = 0;
BcdHours = BcdMinutes = BcdSeconds = 0;
RtcDays = Count / MAX8907B_SECONDS_PER_DAY;
Hours = (Count % MAX8907B_SECONDS_PER_DAY) / MAX8907B_SECONDS_PER_HOUR;
Minutes = ((Count % MAX8907B_SECONDS_PER_DAY) % MAX8907B_SECONDS_PER_HOUR) / MAX8907B_SECONDS_PER_MINUTE;
Seconds = Count % MAX8907B_SECONDS_PER_MINUTE;
BcdHours = (( Hours/10) << 4) | ( Hours%10);
BcdMinutes = ((Minutes/10) << 4) | (Minutes%10);
BcdSeconds = ((Seconds/10) << 4) | (Seconds%10);
data = (BcdSeconds << 24) | (BcdMinutes << 16) | (BcdHours << 8);
if (Max8907bRtcI2cWriteTime(hDevice, MAX8907B_RTC_SEC, data))
{
bRtcNotInitialized = NV_FALSE;
return NV_TRUE;
}
else
{
NvOdmOsDebugPrintf("Max8907bRtcCountWrite() error. ");
return NV_FALSE;
}
}
NvBool
Max8907bRtcAlarmCountWrite(
NvOdmPmuDeviceHandle hDevice,
NvU32 Count)
{
return NV_FALSE;
}
NvBool
Max8907bRtcIsAlarmIntEnabled(NvOdmPmuDeviceHandle hDevice)
{
return NV_FALSE;
}
NvBool
Max8907bRtcAlarmIntEnable(
NvOdmPmuDeviceHandle hDevice,
NvBool Enable)
{
return NV_FALSE;
}
NvBool
Max8907bRtcWasStartUpFromNoPower(NvOdmPmuDeviceHandle hDevice)
{
return NV_TRUE;
}
NvBool
Max8907bIsRtcInitialized(NvOdmPmuDeviceHandle hDevice)
{
return (!bRtcNotInitialized);
}
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