xref: /openbmc/u-boot/net/sntp.c (revision b20c38a9)
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 <dm.h>
11 #include <net.h>
12 #include <rtc.h>
13 
14 #include "sntp.h"
15 
16 #define SNTP_TIMEOUT 10000UL
17 
18 static int sntp_our_port;
19 
20 static void sntp_send(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 *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE,
35 	       (char *)&pkt, pktlen);
36 
37 	sntp_our_port = 10000 + (get_timer(0) % 4096);
38 	sport = NTP_SERVICE_PORT;
39 
40 	net_send_udp_packet(net_server_ethaddr, net_ntp_server, sport,
41 			    sntp_our_port, pktlen);
42 }
43 
44 static void sntp_timeout_handler(void)
45 {
46 	puts("Timeout\n");
47 	net_set_state(NETLOOP_FAIL);
48 	return;
49 }
50 
51 static void sntp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
52 			 unsigned src, unsigned len)
53 {
54 #ifdef CONFIG_TIMESTAMP
55 	struct sntp_pkt_t *rpktp = (struct sntp_pkt_t *)pkt;
56 	struct rtc_time tm;
57 	ulong seconds;
58 #endif
59 
60 	debug("%s\n", __func__);
61 
62 	if (dest != sntp_our_port)
63 		return;
64 
65 #ifdef CONFIG_TIMESTAMP
66 	/*
67 	 * As the RTC's used in U-Boot support second resolution only
68 	 * we simply ignore the sub-second field.
69 	 */
70 	memcpy(&seconds, &rpktp->transmit_timestamp, sizeof(ulong));
71 
72 	rtc_to_tm(ntohl(seconds) - 2208988800UL + net_ntp_time_offset, &tm);
73 #if defined(CONFIG_CMD_DATE)
74 #  ifdef CONFIG_DM_RTC
75 	struct udevice *dev;
76 	int ret;
77 
78 	ret = uclass_get_device(UCLASS_RTC, 0, &dev);
79 	if (ret)
80 		printf("SNTP: cannot find RTC: err=%d\n", ret);
81 	else
82 		dm_rtc_set(dev, &tm);
83 #  else
84 	rtc_set(&tm);
85 #  endif
86 #endif
87 	printf("Date: %4d-%02d-%02d Time: %2d:%02d:%02d\n",
88 	       tm.tm_year, tm.tm_mon, tm.tm_mday,
89 	       tm.tm_hour, tm.tm_min, tm.tm_sec);
90 #endif
91 
92 	net_set_state(NETLOOP_SUCCESS);
93 }
94 
95 void sntp_start(void)
96 {
97 	debug("%s\n", __func__);
98 
99 	net_set_timeout_handler(SNTP_TIMEOUT, sntp_timeout_handler);
100 	net_set_udp_handler(sntp_handler);
101 	memset(net_server_ethaddr, 0, sizeof(net_server_ethaddr));
102 
103 	sntp_send();
104 }
105