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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 <linux/time.h>
#include <linux/rtc.h>
#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).
*
*/
#define MAX8907B_SECONDS_PER_DAY (60*60*24)
#define MAX8907B_SECONDS_PER_HOUR (60*60)
#define MAX8907B_SECONDS_PER_MINUTE (60)
#define LINUX_RTC_BASE_YEAR 1900
static NvBool bRtcNotInitialized = NV_TRUE;
NvBool
Max8907bRtcCountRead(
NvOdmPmuDeviceHandle hDevice,
NvU32* Count)
{
NvU32 data = 0;
NvU32 BcdHours, BcdMinutes, BcdSeconds;
NvU32 Hours, Minutes, Seconds;
NvU32 BcdDD, BcdMM, BcdYY1, BcdYY2;
NvU32 DD, MM, YY1, YY2, YYYY;
// struct rtc_time tm;
*Count = 0;
// Read seconds, minute, hour and weekday data from RTC registers
if (Max8907bRtcI2cReadTime(hDevice, MAX8907B_RTC_SEC, &data))
{
NVODMPMU_PRINTF(("\n Read time data-sec=0x%x ", data));
// Extract seconds, minute and hour data from RTC registers read
BcdHours = (data >> 8) & 0xFF;
BcdMinutes = (data >> 16) & 0xFF;
BcdSeconds = (data >> 24) & 0xFF;
// Convert BCT time into decimal values
Hours = ((BcdHours & 0xF0)>>4)*10 + (BcdHours & 0xF);
Minutes = ((BcdMinutes & 0xF0)>>4)*10 + (BcdMinutes & 0xF);
Seconds = ((BcdSeconds & 0xF0)>>4)*10 + (BcdSeconds & 0xF);
// Read day, month, yy1 and yy2 data from RTC registers
if (Max8907bRtcI2cReadTime(hDevice, MAX8907B_RTC_DATE, &data))
{
NVODMPMU_PRINTF(("\n Read time data-year=0x%x ", data));
// Extract day, month, yy1 and yy2 data from RTC registers read
BcdYY2 = (data & 0xFF);
BcdYY1 = (data >> 8) & 0xFF;
BcdMM = (data >> 16) & 0xFF;
BcdDD = (data >> 24) & 0xFF;
// convert bct day/month/year data to decimal values
YY2 = ((BcdYY2 & 0xF0)>>4)*10 + (BcdYY2 & 0xF);
YY1 = ((BcdYY1 & 0xF0)>>4)*10 + (BcdYY1 & 0xF);
YYYY = (YY2 * 100 + YY1) & 0xFFFF;
MM = ((BcdMM & 0xF0)>>4)*10 + (BcdMM & 0xF);
DD = ((BcdDD & 0xF0)>>4)*10 + (BcdDD & 0xF);
// get seconds since reference time value given
// year, month, day, hour, minutes and seconds
// NOTE: Using linux specific API mktime for conversion
*Count = mktime(YYYY, (MM + 1), DD, Hours, Minutes, Seconds);
NVODMPMU_PRINTF(("\n Rtc read count=0x%x ", *Count));
NVODMPMU_PRINTF(("\n mktime: YYYY=%d MM=%d DD=%d Hr=%d Min=%d "
"Sec=%d, *Count=0x%x ", YYYY, (MM + 1), DD, Hours, Minutes,
Seconds, *Count));
#if NV_DEBUG
// Call to verify that reverse conversion of seconds matches date
rtc_time_to_tm(*Count, &tm);
// Check if Local_rtc_time_to_tm can return values sent to mktime
NVODMPMU_PRINTF(("\n rtc_time_to_tm: YYYY=%d MM=%d DD=%d Hr=%d "
"Min=%d Sec=%d, *Count=0x%x ", (tm.tm_year +
LINUX_RTC_BASE_YEAR), tm.tm_mon, tm.tm_mday, tm.tm_hour,
tm.tm_min, tm.tm_sec, *Count));
#endif
}
else
{
NVODMPMU_PRINTF(("\n Max8907bRtcCountRead() error. "));
return NV_FALSE;
}
}
else
{
NVODMPMU_PRINTF(("\n Max8907bRtcCountRead() error. "));
return NV_FALSE;
}
NVODMPMU_PRINTF(("\n *Count=0x%x ", *Count));
return NV_TRUE;
}
NvBool
Max8907bRtcAlarmCountRead(
NvOdmPmuDeviceHandle hDevice,
NvU32* Count)
{
return NV_FALSE;
}
NvBool
Max8907bRtcCountWrite(
NvOdmPmuDeviceHandle hDevice,
NvU32 Count)
{
NvU32 BcdHours, BcdMinutes, BcdSeconds;
NvU32 data = 0;
NvU8 BcdDD, BcdMM, BcdYY1, BcdYY2;
NvU16 YYYY;
struct rtc_time tm;
NvU32 data1;
NVODMPMU_PRINTF(("\n Rtc write count=0x%x ", Count));
// convert seconds since reference time into date
// NOTE: using linux specific convert function rtc_time_to_tm
rtc_time_to_tm(Count, &tm);
NVODMPMU_PRINTF(("\n rtc_time_to_tm: YYYY=%d MM=%d DD=%d Hr=%d Min=%d "
"Sec=%d, *Count=0x%x ", (tm.tm_year + LINUX_RTC_BASE_YEAR),
(tm.tm_mon + 1), tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec, Count));
// Convert time to bcd format
BcdHours = ((tm.tm_hour / 10) << 4) | (tm.tm_hour % 10);
BcdMinutes = ((tm.tm_min/10) << 4) | (tm.tm_min%10);
BcdSeconds = ((tm.tm_sec/10) << 4) | (tm.tm_sec%10);
data = (BcdSeconds << 24) | (BcdMinutes << 16) | (BcdHours << 8);
// write time - seconds, minutes and hours in a day to RTC registers
if (Max8907bRtcI2cWriteTime(hDevice, MAX8907B_RTC_SEC, data))
{
// set the day, month, year
// Assuming we get the days since 1 Jan 1970
// convert date to bct format
BcdDD = (((NvU8)tm.tm_mday / 10) << 4) | ((NvU8)tm.tm_mday % 10);
BcdMM = (((NvU8)tm.tm_mon / 10) << 4) | ((NvU8)tm.tm_mon % 10);
YYYY = (NvU16)tm.tm_year + LINUX_RTC_BASE_YEAR;
BcdYY1 = (((NvU8)(YYYY % 100) / 10) << 4) | ((NvU8)(YYYY % 100) % 10);
BcdYY2 = (((NvU8)(YYYY / 100) / 10) << 4) | ((NvU8)(YYYY / 100) % 10);
data = (NvU32)((BcdDD << 24) | (BcdMM << 16) | (BcdYY1 << 8) | BcdYY2);
// write date - day, month, and year to RTC registers
if (!(Max8907bRtcI2cWriteTime(hDevice, MAX8907B_RTC_DATE, data)))
{
NVODMPMU_PRINTF(("\n Max8907bRtcCountWrite() error. "));
return NV_FALSE;
}
#if NV_DEBUG
// verify that read back values from RTC matches written values
if (!(Max8907bRtcI2cReadTime(hDevice, MAX8907B_RTC_DATE, &data1)))
{
NVODMPMU_PRINTF(("\n Max8907bRtcCountRead() error. "));
return NV_FALSE;
}
if (data1 == data)
{
NVODMPMU_PRINTF(("\n Write read Success. "));
return NV_TRUE;
}
else
{
// return error when read data does not match written data
NVODMPMU_PRINTF(("\n Error: write data=0x%x, rd data=0x%x. ", data, data1));
return NV_FALSE;
}
#endif
}
else
{
NVODMPMU_PRINTF(("\n 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
Max8907bIsRtcInitialized(NvOdmPmuDeviceHandle hDevice)
{
return (!bRtcNotInitialized);
}
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