1: /*
2: * refclock_tt560 - clock driver for the TrueTime 560 IRIG-B decoder
3: */
4:
5: #ifdef HAVE_CONFIG_H
6: #include <config.h>
7: #endif
8:
9: #if defined(REFCLOCK) && defined(CLOCK_TT560)
10:
11: #include "ntpd.h"
12: #include "ntp_io.h"
13: #include "ntp_refclock.h"
14: #include "ntp_unixtime.h"
15: #include "sys/tt560_api.h"
16: #include "ntp_stdlib.h"
17:
18: #include <stdio.h>
19: #include <ctype.h>
20:
21: /*
22: * This driver supports the TrueTime 560 IRIG-B decoder for the PCI bus.
23: */
24:
25: /*
26: * TT560 interface definitions
27: */
28: #define DEVICE "/dev/tt560%d" /* device name and unit */
29: #define PRECISION (-20) /* precision assumed (1 us) */
30: #define REFID "IRIG" /* reference ID */
31: #define DESCRIPTION "TrueTime 560 IRIG-B PCI Decoder"
32:
33: /*
34: * Unit control structure
35: */
36: struct tt560unit {
37: tt_mem_space_t *tt_mem; /* mapped address of PCI board */
38: time_freeze_reg_t tt560rawt; /* data returned from PCI board */
39: };
40:
41: typedef union byteswap_u
42: {
43: unsigned int long_word;
44: unsigned char byte[4];
45: } byteswap_t;
46:
47: /*
48: * Function prototypes
49: */
50: static int tt560_start (int, struct peer *);
51: static void tt560_shutdown (int, struct peer *);
52: static void tt560_poll (int unit, struct peer *);
53:
54: /*
55: * Transfer vector
56: */
57: struct refclock refclock_tt560 = {
58: tt560_start, /* clock_start */
59: tt560_shutdown, /* clock_shutdown */
60: tt560_poll, /* clock_poll */
61: noentry, /* clock_control (not used) */
62: noentry, /* clock_init (not used) */
63: noentry, /* clock_buginfo (not used) */
64: NOFLAGS /* clock_flags (not used) */
65: };
66:
67:
68: /*
69: * tt560_start - open the TT560 device and initialize data for processing
70: */
71: static int
72: tt560_start(
73: int unit,
74: struct peer *peer
75: )
76: {
77: register struct tt560unit *up;
78: struct refclockproc *pp;
79: char device[20];
80: int fd;
81: caddr_t membase;
82:
83: /*
84: * Open TT560 device
85: */
86: (void)sprintf(device, DEVICE, unit);
87: fd = open(device, O_RDWR);
88: if (fd == -1) {
89: msyslog(LOG_ERR, "tt560_start: open of %s: %m", device);
90: return (0);
91: }
92:
93: /*
94: * Map the device registers into user space.
95: */
96: membase = mmap ((caddr_t) 0, TTIME_MEMORY_SIZE,
97: PROT_READ | PROT_WRITE,
98: MAP_SHARED, fd, (off_t)0);
99:
100: if (membase == (caddr_t) -1) {
101: msyslog(LOG_ERR, "tt560_start: mapping of %s: %m", device);
102: (void) close(fd);
103: return (0);
104: }
105:
106: /*
107: * Allocate and initialize unit structure
108: */
109: if (!(up = (struct tt560unit *) emalloc(sizeof(struct tt560unit)))) {
110: (void) close(fd);
111: return (0);
112: }
113: memset((char *)up, 0, sizeof(struct tt560unit));
114: up->tt_mem = (tt_mem_space_t *)membase;
115: pp = peer->procptr;
116: pp->io.clock_recv = noentry;
117: pp->io.srcclock = (caddr_t)peer;
118: pp->io.datalen = 0;
119: pp->io.fd = fd;
120: pp->unitptr = (caddr_t)up;
121:
122: /*
123: * Initialize miscellaneous peer variables
124: */
125: peer->precision = PRECISION;
126: peer->burst = NSTAGE;
127: pp->clockdesc = DESCRIPTION;
128: memcpy((char *)&pp->refid, REFID, 4);
129: return (1);
130: }
131:
132:
133: /*
134: * tt560_shutdown - shut down the clock
135: */
136: static void
137: tt560_shutdown(
138: int unit,
139: struct peer *peer
140: )
141: {
142: register struct tt560unit *up;
143: struct refclockproc *pp;
144:
145: pp = peer->procptr;
146: up = (struct tt560unit *)pp->unitptr;
147: io_closeclock(&pp->io);
148: free(up);
149: }
150:
151:
152: /*
153: * tt560_poll - called by the transmit procedure
154: */
155: static void
156: tt560_poll(
157: int unit,
158: struct peer *peer
159: )
160: {
161: register struct tt560unit *up;
162: struct refclockproc *pp;
163: time_freeze_reg_t *tp;
164: tt_mem_space_t *mp;
165:
166: int i;
167: unsigned int *p_time_t, *tt_mem_t;
168:
169: /*
170: * This is the main routine. It snatches the time from the TT560
171: * board and tacks on a local timestamp.
172: */
173: pp = peer->procptr;
174: up = (struct tt560unit *)pp->unitptr;
175: mp = up->tt_mem;
176: tp = &up->tt560rawt;
177:
178: p_time_t = (unsigned int *)tp;
179: tt_mem_t = (unsigned int *)&mp->time_freeze_reg;
180:
181: *tt_mem_t = 0; /* update the time freeze register */
182: /* and copy time stamp to memory */
183: for (i=0; i < TIME_FREEZE_REG_LEN; i++) {
184: *p_time_t = byte_swap(*tt_mem_t);
185: p_time_t++;
186: tt_mem_t++;
187: }
188:
189: get_systime(&pp->lastrec);
190: pp->polls++;
191:
192: /*
193: * We get down to business, check the timecode format and decode
194: * its contents. If the timecode has invalid length or is not in
195: * proper format, we declare bad format and exit. Note: we
196: * can't use the sec/usec conversion produced by the driver,
197: * since the year may be suspect. All format error checking is
198: * done by the sprintf() and sscanf() routines.
199: */
200: sprintf(pp->a_lastcode,
201: "%1x%1x%1x %1x%1x:%1x%1x:%1x%1x.%1x%1x%1x%1x%1x%1x %1x",
202: tp->hun_day, tp->tens_day, tp->unit_day,
203: tp->tens_hour, tp->unit_hour,
204: tp->tens_min, tp->unit_min,
205: tp->tens_sec, tp->unit_sec,
206: tp->hun_ms, tp->tens_ms, tp->unit_ms,
207: tp->hun_us, tp->tens_us, tp->unit_us,
208: tp->status);
209: pp->lencode = strlen(pp->a_lastcode);
210: #ifdef DEBUG
211: if (debug)
212: printf("tt560: time %s timecode %d %s\n",
213: ulfptoa(&pp->lastrec, 6), pp->lencode,
214: pp->a_lastcode);
215: #endif
216: if (sscanf(pp->a_lastcode, "%3d %2d:%2d:%2d.%6ld",
217: &pp->day, &pp->hour, &pp->minute, &pp->second, &pp->usec)
218: != 5) {
219: refclock_report(peer, CEVNT_BADTIME);
220: return;
221: }
222: if ((tp->status & 0x6) != 0x6)
223: pp->leap = LEAP_NOTINSYNC;
224: else
225: pp->leap = LEAP_NOWARNING;
226: if (!refclock_process(pp)) {
227: refclock_report(peer, CEVNT_BADTIME);
228: return;
229: }
230: if (peer->burst > 0)
231: return;
232: if (pp->coderecv == pp->codeproc) {
233: refclock_report(peer, CEVNT_TIMEOUT);
234: return;
235: }
236: record_clock_stats(&peer->srcadr, pp->a_lastcode);
237: refclock_receive(peer);
238: peer->burst = NSTAGE;
239: }
240:
241: /******************************************************************
242: *
243: * byte_swap
244: *
245: * Inputs: 32 bit integer
246: *
247: * Output: byte swapped 32 bit integer.
248: *
249: * This routine is used to compensate for the byte alignment
250: * differences between big-endian and little-endian integers.
251: *
252: ******************************************************************/
253: static unsigned int
254: byte_swap(unsigned int input_num)
255: {
256: byteswap_t byte_swap;
257: unsigned char temp;
258:
259: byte_swap.long_word = input_num;
260:
261: temp = byte_swap.byte[3];
262: byte_swap.byte[3] = byte_swap.byte[0];
263: byte_swap.byte[0] = temp;
264:
265: temp = byte_swap.byte[2];
266: byte_swap.byte[2] = byte_swap.byte[1];
267: byte_swap.byte[1] = temp;
268:
269: return (byte_swap.long_word);
270: }
271:
272: #else
273: int refclock_tt560_bs;
274: #endif /* REFCLOCK */
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