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 sntp_our_port;
  18
  19 static void sntp_send(void)
  20 {
  21         struct sntp_pkt_t pkt;
  22         int pktlen = SNTP_PACKET_LEN;
  23         int sport;
  24
  25         debug("%s\n", __func__);
  26
  27         memset(&pkt, 0, sizeof(pkt));
  28
  29         pkt.li = NTP_LI_NOLEAP;
  30         pkt.vn = NTP_VERSION;
  31         pkt.mode = NTP_MODE_CLIENT;
  32
  33         memcpy((char *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE,
  34                (char *)&pkt, pktlen);
  35
  36         sntp_our_port = 10000 + (get_timer(0) % 4096);
  37         sport = NTP_SERVICE_PORT;
  38
  39         net_send_udp_packet(net_server_ethaddr, net_ntp_server, sport,
  40                             sntp_our_port, pktlen);
  41 }
  42
  43 static void sntp_timeout_handler(void)
  44 {
  45         puts("Timeout\n");
  46         net_set_state(NETLOOP_FAIL);
  47         return;
  48 }
  49
  50 static void sntp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
  51                          unsigned src, unsigned len)
  52 {
  53 #ifdef CONFIG_TIMESTAMP
  54         struct sntp_pkt_t *rpktp = (struct sntp_pkt_t *)pkt;
  55         struct rtc_time tm;
  56         ulong seconds;
  57 #endif
  58
  59         debug("%s\n", __func__);
  60
  61         if (dest != sntp_our_port)
  62                 return;
  63
  64 #ifdef CONFIG_TIMESTAMP
  65         /*
  66          * As the RTC's used in U-Boot support 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 + net_ntp_time_offset, &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 #endif
  79
  80         net_set_state(NETLOOP_SUCCESS);
  81 }
  82
  83 void sntp_start(void)
  84 {
  85         debug("%s\n", __func__);
  86
  87         net_set_timeout_handler(SNTP_TIMEOUT, sntp_timeout_handler);
  88         net_set_udp_handler(sntp_handler);
  89         memset(net_server_ethaddr, 0, sizeof(net_server_ethaddr));
  90
  91         sntp_send();
  92 }