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/***********************license start***************
* Copyright (c) 2003-2010 Cavium Inc. (support@cavium.com). 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 Cavium Inc. 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, including technical data, may be subject to U.S. export control
* laws, including the U.S. Export Administration Act and its associated
* regulations, and may be subject to export or import regulations in other
* countries.
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
* AND WITH ALL FAULTS AND CAVIUM INC. MAKES NO PROMISES, REPRESENTATIONS OR
* WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
* THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR
* DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
* SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
* MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
* VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
* CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR
* PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
***********************license end**************************************/
/**
* @file
*
* Interface to the EBH-30xx specific devices
*
* <hr>$Revision: 70030 $<hr>
*
*/
#include <time.h>
#include "cvmx-config.h"
#include "cvmx.h"
#include "cvmx-sysinfo.h"
#include "cvmx-cn3010-evb-hs5.h"
#include "cvmx-twsi.h"
static inline uint8_t bin2bcd(uint8_t bin)
{
return (bin / 10) << 4 | (bin % 10);
}
static inline uint8_t bcd2bin(uint8_t bcd)
{
return (bcd >> 4) * 10 + (bcd & 0xf);
}
#define TM_CHECK(_expr, _msg) \
do { \
if (_expr) { \
cvmx_dprintf("Warning: RTC has invalid %s field\n", (_msg)); \
rc = -1; \
} \
} while(0);
static int validate_tm_struct(struct tm * tms)
{
int rc = 0;
if (!tms)
return -1;
TM_CHECK(tms->tm_sec < 0 || tms->tm_sec > 60, "second"); /* + Leap sec */
TM_CHECK(tms->tm_min < 0 || tms->tm_min > 59, "minute");
TM_CHECK(tms->tm_hour < 0 || tms->tm_hour > 23, "hour");
TM_CHECK(tms->tm_mday < 1 || tms->tm_mday > 31, "day");
TM_CHECK(tms->tm_wday < 0 || tms->tm_wday > 6, "day of week");
TM_CHECK(tms->tm_mon < 0 || tms->tm_mon > 11, "month");
TM_CHECK(tms->tm_year < 0 || tms->tm_year > 200,"year");
return rc;
}
/*
* Board-specifc RTC read
* Time is expressed in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
* and converted internally to calendar format.
*/
uint32_t cvmx_rtc_ds1337_read(void)
{
int i, retry;
uint32_t time;
uint8_t reg[8];
uint8_t sec;
struct tm tms;
memset(®, 0, sizeof(reg));
memset(&tms, 0, sizeof(struct tm));
for(retry=0; retry<2; retry++)
{
/* Lockless read: detects the infrequent roll-over and retries */
reg[0] = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
for(i=1; i<7; i++)
reg[i] = cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1337_ADDR);
sec = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
if ((sec & 0xf) == (reg[0] & 0xf))
break; /* Time did not roll-over, value is correct */
}
tms.tm_sec = bcd2bin(reg[0] & 0x7f);
tms.tm_min = bcd2bin(reg[1] & 0x7f);
tms.tm_hour = bcd2bin(reg[2] & 0x3f);
if ((reg[2] & 0x40) && (reg[2] & 0x20)) /* AM/PM format and is PM time */
{
tms.tm_hour = (tms.tm_hour + 12) % 24;
}
tms.tm_wday = (reg[3] & 0x7) - 1; /* Day of week field is 0..6 */
tms.tm_mday = bcd2bin(reg[4] & 0x3f);
tms.tm_mon = bcd2bin(reg[5] & 0x1f) - 1; /* Month field is 0..11 */
tms.tm_year = ((reg[5] & 0x80) ? 100 : 0) + bcd2bin(reg[6]);
if (validate_tm_struct(&tms))
cvmx_dprintf("Warning: RTC calendar is not configured properly\n");
time = mktime(&tms);
return time;
}
/*
* Board-specific RTC write
* Time returned is in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
*/
int cvmx_rtc_ds1337_write(uint32_t time)
{
int i, rc, retry;
struct tm tms;
uint8_t reg[8];
uint8_t sec;
time_t time_from_epoch = time;
localtime_r(&time_from_epoch, &tms);
if (validate_tm_struct(&tms))
{
cvmx_dprintf("Error: RTC was passed wrong calendar values, write failed\n");
goto tm_invalid;
}
reg[0] = bin2bcd(tms.tm_sec);
reg[1] = bin2bcd(tms.tm_min);
reg[2] = bin2bcd(tms.tm_hour); /* Force 0..23 format even if using AM/PM */
reg[3] = bin2bcd(tms.tm_wday + 1);
reg[4] = bin2bcd(tms.tm_mday);
reg[5] = bin2bcd(tms.tm_mon + 1);
if (tms.tm_year >= 100) /* Set century bit*/
{
reg[5] |= 0x80;
}
reg[6] = bin2bcd(tms.tm_year % 100);
/* Lockless write: detects the infrequent roll-over and retries */
for(retry=0; retry<2; retry++)
{
rc = 0;
for(i=0; i<7; i++)
{
rc |= cvmx_twsi_write8(CVMX_RTC_DS1337_ADDR, i, reg[i]);
}
sec = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
if ((sec & 0xf) == (reg[0] & 0xf))
break; /* Time did not roll-over, value is correct */
}
return (rc ? -1 : 0);
tm_invalid:
return -1;
}
#ifdef CVMX_RTC_DEBUG
void cvmx_rtc_ds1337_dump_state(void)
{
int i = 0;
printf("RTC:\n");
printf("%d : %02X ", i, cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0));
for(i=1; i<16; i++) {
printf("%02X ", cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1337_ADDR));
}
printf("\n");
}
#endif /* CVMX_RTC_DEBUG */
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