net/sntp.c

/*
 * SNTP support driver
 *
 * Masami Komiya <mkomiya@sonare.it> 2005
 *
 */

#include <common.h>
#include <command.h>
#include <net.h>
#include <rtc.h>

#include "sntp.h"

#define SNTP_TIMEOUT 10000UL

static int SntpOurPort;

static void
SntpSend(void)
{
	struct sntp_pkt_t pkt;
	int pktlen = SNTP_PACKET_LEN;
	int sport;

	debug("%s\n", __func__);

	memset(&pkt, 0, sizeof(pkt));

	pkt.li = NTP_LI_NOLEAP;
	pkt.vn = NTP_VERSION;
	pkt.mode = NTP_MODE_CLIENT;

	memcpy((char *)NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE,
		(char *)&pkt, pktlen);

	SntpOurPort = 10000 + (get_timer(0) % 4096);
	sport = NTP_SERVICE_PORT;

	NetSendUDPPacket(NetServerEther, NetNtpServerIP, sport, SntpOurPort,
		pktlen);
}

static void
SntpTimeout(void)
{
	puts("Timeout\n");
	net_set_state(NETLOOP_FAIL);
	return;
}

static void
SntpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
	    unsigned len)
{
	struct sntp_pkt_t *rpktp = (struct sntp_pkt_t *)pkt;
	struct rtc_time tm;
	ulong seconds;

	debug("%s\n", __func__);

	if (dest != SntpOurPort)
		return;

	/*
	 * As the RTC's used in U-Boot sepport second resolution only
	 * we simply ignore the sub-second field.
	 */
	memcpy(&seconds, &rpktp->transmit_timestamp, sizeof(ulong));

	to_tm(ntohl(seconds) - 2208988800UL + NetTimeOffset, &tm);
#if defined(CONFIG_CMD_DATE)
	rtc_set(&tm);
#endif
	printf("Date: %4d-%02d-%02d Time: %2d:%02d:%02d\n",
		tm.tm_year, tm.tm_mon, tm.tm_mday,
		tm.tm_hour, tm.tm_min, tm.tm_sec);

	net_set_state(NETLOOP_SUCCESS);
}

void
SntpStart(void)
{
	debug("%s\n", __func__);

	NetSetTimeout(SNTP_TIMEOUT, SntpTimeout);
	net_set_udp_handler(SntpHandler);
	memset(NetServerEther, 0, sizeof(NetServerEther));

	SntpSend();
}