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