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

     /***********************license start***************
      * SPDX-License-Identifier: BSD-3-Clause
      *
      *  Copyright (c) 2003-2008 Cavium Networks (support@cavium.com). All rights
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     ***********************license end**************************************/
    
    
    
    
    
    
    /**
     * @file
     *
     * Interface to the EBH-30xx specific devices
     *
     * <hr>$Revision: 41586 $<hr>
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/timespec.h>
    #include <sys/clock.h>
    #include <sys/libkern.h>
    
    #include <contrib/octeon-sdk/cvmx.h>
    #include <contrib/octeon-sdk/cvmx-cn3010-evb-hs5.h>
    #include <contrib/octeon-sdk/cvmx-twsi.h>
    
    #define CT_CHECK(_expr, _msg) \
            do { \
                if (_expr) { \
                    cvmx_dprintf("Warning: RTC has invalid %s field\n", (_msg)); \
                    rc = -1; \
                } \
            } while(0);
    
    static int validate_ct_struct(struct clocktime *ct)
    {
        int rc = 0;
    
        if (!ct)
            return -1;
    
        CT_CHECK(ct->sec < 0  || ct->sec > 60,  "second"); /* + Leap sec */
        CT_CHECK(ct->min < 0  || ct->min > 59,  "minute");
        CT_CHECK(ct->hour < 0 || ct->hour > 23, "hour");
        CT_CHECK(ct->day < 1 || ct->day > 31, "day");
        CT_CHECK(ct->dow < 0 || ct->dow > 6,  "day of week");
        CT_CHECK(ct->mon < 1  || ct->mon > 12,  "month");
        CT_CHECK(ct->year > 2037,"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;
       uint8_t   reg[8];
       uint8_t   sec;
       struct clocktime ct;
       struct timespec ts;
   
   
       memset(&reg, 0, sizeof(reg));
       memset(&ct, 0, sizeof(ct));
   
       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 */
       }
   
       ct.sec  = bcd2bin(reg[0] & 0x7f);
       ct.min  = bcd2bin(reg[1] & 0x7f);
       ct.hour = bcd2bin(reg[2] & 0x3f);
       if ((reg[2] & 0x40) && (reg[2] & 0x20))   /* AM/PM format and is PM time */
       {
           ct.hour = (ct.hour + 12) % 24;
       }
       ct.dow = (reg[3] & 0x7) - 1; /* Day of week field is 0..6 */
       ct.day = bcd2bin(reg[4] & 0x3f);
       ct.mon  = bcd2bin(reg[5] & 0x1f); /* Month field is 1..12 */
   #if defined(OCTEON_BOARD_CAPK_0100ND)
       /*
        * CAPK-0100ND uses DS1307 that does not have century bit
        */
       ct.year = 2000 + bcd2bin(reg[6]);
   #else
       ct.year = ((reg[5] & 0x80) ? 2000 : 1900) + bcd2bin(reg[6]);
   #endif
   
       if (validate_ct_struct(&ct))
           cvmx_dprintf("Warning: RTC calendar is not configured properly\n");
   
       if (clock_ct_to_ts(&ct, &ts) != 0) {
           cvmx_dprintf("Warning: RTC calendar is not configured properly\n");
           return 0;
       }
   
       return ts.tv_sec;
   }
   
   /*
    * 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)
   {
       struct clocktime ct;
       struct timespec ts;
       int       i, rc, retry;
       uint8_t   reg[8];
       uint8_t   sec;
   
       ts.tv_sec = time;
       ts.tv_nsec = 0;
   
       clock_ts_to_ct(&ts, &ct);
   
       if (validate_ct_struct(&ct))
       {
           cvmx_dprintf("Error: RTC was passed wrong calendar values, write failed\n");
           goto ct_invalid;
       }
   
       reg[0] = bin2bcd(ct.sec);
       reg[1] = bin2bcd(ct.min);
       reg[2] = bin2bcd(ct.hour);       /* Force 0..23 format even if using AM/PM */
       reg[3] = bin2bcd(ct.dow + 1);
       reg[4] = bin2bcd(ct.day);
       reg[5] = bin2bcd(ct.mon);
   #if !defined(OCTEON_BOARD_CAPK_0100ND)
       if (ct.year >= 2000)             /* Set century bit*/
       {
           reg[5] |= 0x80;
       }
   #endif
       reg[6] = bin2bcd(ct.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);
   
    ct_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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