net/sntp.c

   1 /*
   2  * SNTP support driver
   3  *
   4  * Masami Komiya <mkomiya@sonare.it> 2005
   5  *
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <net.h>
  11 #include <rtc.h>
  12
  13 #include "sntp.h"
  14
  15 #define SNTP_TIMEOUT 10000UL
  16
  17 static int SntpOurPort;
  18
  19 static void
  20 SntpSend(void)
  21 {
  22         struct sntp_pkt_t pkt;
  23         int pktlen = SNTP_PACKET_LEN;
  24         int sport;
  25
  26         debug("%s\n", __func__);
  27
  28         memset(&pkt, 0, sizeof(pkt));
  29
  30         pkt.li = NTP_LI_NOLEAP;
  31         pkt.vn = NTP_VERSION;
  32         pkt.mode = NTP_MODE_CLIENT;
  33
  34         memcpy((char *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE,
  35                 (char *)&pkt, pktlen);
  36
  37         SntpOurPort = 10000 + (get_timer(0) % 4096);
  38         sport = NTP_SERVICE_PORT;
  39
  40         NetSendUDPPacket(NetServerEther, NetNtpServerIP, sport, SntpOurPort,
  41                 pktlen);
  42 }
  43
  44 static void
  45 SntpTimeout(void)
  46 {
  47         puts("Timeout\n");
  48         net_set_state(NETLOOP_FAIL);
  49         return;
  50 }
  51
  52 static void
  53 SntpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
  54             unsigned len)
  55 {
  56         struct sntp_pkt_t *rpktp = (struct sntp_pkt_t *)pkt;
  57         struct rtc_time tm;
  58         ulong seconds;
  59
  60         debug("%s\n", __func__);
  61
  62         if (dest != SntpOurPort)
  63                 return;
  64
  65         /*
  66          * As the RTC's used in U-Boot sepport second resolution only
  67          * we simply ignore the sub-second field.
  68          */
  69         memcpy(&seconds, &rpktp->transmit_timestamp, sizeof(ulong));
  70
  71         to_tm(ntohl(seconds) - 2208988800UL + NetTimeOffset, &tm);
  72 #if defined(CONFIG_CMD_DATE)
  73         rtc_set(&tm);
  74 #endif
  75         printf("Date: %4d-%02d-%02d Time: %2d:%02d:%02d\n",
  76                 tm.tm_year, tm.tm_mon, tm.tm_mday,
  77                 tm.tm_hour, tm.tm_min, tm.tm_sec);
  78
  79         net_set_state(NETLOOP_SUCCESS);
  80 }
  81
  82 void
  83 SntpStart(void)
  84 {
  85         debug("%s\n", __func__);
  86
  87         NetSetTimeout(SNTP_TIMEOUT, SntpTimeout);
  88         net_set_udp_handler(SntpHandler);
  89         memset(NetServerEther, 0, sizeof(NetServerEther));
  90
  91         SntpSend();
  92 }