The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/cavium/octeon_ds1337.c

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    1 /***********************license start***************
    2  *  Copyright (c) 2003-2008 Cavium Networks (support@cavium.com). All rights
    3  *  reserved.
    4  *
    5  *
    6  *  Redistribution and use in source and binary forms, with or without
    7  *  modification, are permitted provided that the following conditions are
    8  *  met:
    9  *
   10  *      * Redistributions of source code must retain the above copyright
   11  *        notice, this list of conditions and the following disclaimer.
   12  *
   13  *      * Redistributions in binary form must reproduce the above
   14  *        copyright notice, this list of conditions and the following
   15  *        disclaimer in the documentation and/or other materials provided
   16  *        with the distribution.
   17  *
   18  *      * Neither the name of Cavium Networks nor the names of
   19  *        its contributors may be used to endorse or promote products
   20  *        derived from this software without specific prior written
   21  *        permission.
   22  *
   23  *  TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
   24  *  AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS
   25  *  OR WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH
   26  *  RESPECT TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY
   27  *  REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT
   28  *  DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES
   29  *  OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR
   30  *  PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET
   31  *  POSSESSION OR CORRESPONDENCE TO DESCRIPTION.  THE ENTIRE RISK ARISING OUT
   32  *  OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
   33  *
   34  *
   35  *  For any questions regarding licensing please contact marketing@caviumnetworks.com
   36  *
   37  ***********************license end**************************************/
   38 
   39 
   40 
   41 
   42 
   43 
   44 /**
   45  * @file
   46  *
   47  * Interface to the EBH-30xx specific devices
   48  *
   49  * <hr>$Revision: 41586 $<hr>
   50  *
   51  */
   52 
   53 #include <sys/cdefs.h>
   54 __FBSDID("$FreeBSD: releng/8.4/sys/mips/cavium/octeon_ds1337.c 215938 2010-11-27 12:26:40Z jchandra $");
   55 
   56 #include <sys/param.h>
   57 #include <sys/timespec.h>
   58 #include <sys/clock.h>
   59 #include <sys/libkern.h>
   60 
   61 #include <contrib/octeon-sdk/cvmx.h>
   62 #include <contrib/octeon-sdk/cvmx-cn3010-evb-hs5.h>
   63 #include <contrib/octeon-sdk/cvmx-twsi.h>
   64 
   65 #define CT_CHECK(_expr, _msg) \
   66         do { \
   67             if (_expr) { \
   68                 cvmx_dprintf("Warning: RTC has invalid %s field\n", (_msg)); \
   69                 rc = -1; \
   70             } \
   71         } while(0);
   72 
   73 static int validate_ct_struct(struct clocktime *ct)
   74 {
   75     int rc = 0;
   76 
   77     if (!ct)
   78         return -1;
   79 
   80     CT_CHECK(ct->sec < 0  || ct->sec > 60,  "second"); /* + Leap sec */
   81     CT_CHECK(ct->min < 0  || ct->min > 59,  "minute");
   82     CT_CHECK(ct->hour < 0 || ct->hour > 23, "hour");
   83     CT_CHECK(ct->day < 1 || ct->day > 31, "day");
   84     CT_CHECK(ct->dow < 0 || ct->dow > 6,  "day of week");
   85     CT_CHECK(ct->mon < 0  || ct->mon > 11,  "month");
   86     CT_CHECK(ct->year < 0 || ct->year > 200,"year");
   87 
   88     return rc;
   89 }
   90 
   91 /*
   92  * Board-specifc RTC read
   93  * Time is expressed in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
   94  * and converted internally to calendar format.
   95  */
   96 uint32_t cvmx_rtc_ds1337_read(void)
   97 {
   98     int       i, retry;
   99     uint8_t   reg[8];
  100     uint8_t   sec;
  101     struct clocktime ct;
  102     struct timespec ts;
  103 
  104 
  105     memset(&reg, 0, sizeof(reg));
  106     memset(&ct, 0, sizeof(ct));
  107 
  108     for(retry=0; retry<2; retry++)
  109     {
  110         /* Lockless read: detects the infrequent roll-over and retries */
  111         reg[0] = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
  112         for(i=1; i<7; i++)
  113             reg[i] = cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1337_ADDR);
  114 
  115         sec = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
  116         if ((sec & 0xf) == (reg[0] & 0xf))
  117             break; /* Time did not roll-over, value is correct */
  118     }
  119 
  120     ct.sec  = bcd2bin(reg[0] & 0x7f);
  121     ct.min  = bcd2bin(reg[1] & 0x7f);
  122     ct.hour = bcd2bin(reg[2] & 0x3f);
  123     if ((reg[2] & 0x40) && (reg[2] & 0x20))   /* AM/PM format and is PM time */
  124     {
  125         ct.hour = (ct.hour + 12) % 24;
  126     }
  127     ct.dow = (reg[3] & 0x7) - 1;         /* Day of week field is 0..6 */
  128     ct.day = bcd2bin(reg[4] & 0x3f);
  129     ct.mon  = bcd2bin(reg[5] & 0x1f) - 1; /* Month field is 0..11 */
  130     ct.year = ((reg[5] & 0x80) ? 100 : 0) + bcd2bin(reg[6]);
  131 
  132 
  133     if (validate_ct_struct(&ct))
  134         cvmx_dprintf("Warning: RTC calendar is not configured properly\n");
  135 
  136     if (clock_ct_to_ts(&ct, &ts) != 0) {
  137         cvmx_dprintf("Warning: RTC calendar is not configured properly\n");
  138         return 0;
  139     }
  140 
  141     return ts.tv_sec;
  142 }
  143 
  144 /*
  145  * Board-specific RTC write
  146  * Time returned is in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
  147  */
  148 int cvmx_rtc_ds1337_write(uint32_t time)
  149 {
  150     struct clocktime ct;
  151     struct timespec ts;
  152     int       i, rc, retry;
  153     uint8_t   reg[8];
  154     uint8_t   sec;
  155 
  156     ts.tv_sec = time;
  157     ts.tv_nsec = 0;
  158 
  159     clock_ts_to_ct(&ts, &ct);
  160 
  161     if (validate_ct_struct(&ct))
  162     {
  163         cvmx_dprintf("Error: RTC was passed wrong calendar values, write failed\n");
  164         goto ct_invalid;
  165     }
  166 
  167     reg[0] = bin2bcd(ct.sec);
  168     reg[1] = bin2bcd(ct.min);
  169     reg[2] = bin2bcd(ct.hour);      /* Force 0..23 format even if using AM/PM */
  170     reg[3] = bin2bcd(ct.dow + 1);
  171     reg[4] = bin2bcd(ct.day);
  172     reg[5] = bin2bcd(ct.mon + 1);
  173     if (ct.year >= 100)             /* Set century bit*/
  174     {
  175         reg[5] |= 0x80;
  176     }
  177     reg[6] = bin2bcd(ct.year % 100);
  178 
  179     /* Lockless write: detects the infrequent roll-over and retries */
  180     for(retry=0; retry<2; retry++)
  181     {
  182         rc = 0;
  183         for(i=0; i<7; i++)
  184         {
  185             rc |= cvmx_twsi_write8(CVMX_RTC_DS1337_ADDR, i, reg[i]);
  186         }
  187 
  188         sec = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
  189         if ((sec & 0xf) == (reg[0] & 0xf))
  190             break; /* Time did not roll-over, value is correct */
  191     }
  192 
  193     return (rc ? -1 : 0);
  194 
  195  ct_invalid:
  196     return -1;
  197 }
  198 
  199 #ifdef CVMX_RTC_DEBUG
  200 
  201 void cvmx_rtc_ds1337_dump_state(void)
  202 {
  203     int i = 0;
  204 
  205     printf("RTC:\n");
  206     printf("%d : %02X ", i, cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0));
  207     for(i=1; i<16; i++) {
  208         printf("%02X ", cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1337_ADDR));
  209     }
  210     printf("\n");
  211 }
  212 
  213 #endif /* CVMX_RTC_DEBUG */

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