The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/timepps.h

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    1 /*-
    2  * SPDX-License-Identifier: Beerware
    3  *
    4  * ----------------------------------------------------------------------------
    5  * "THE BEER-WARE LICENSE" (Revision 42):
    6  * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
    7  * can do whatever you want with this stuff. If we meet some day, and you think
    8  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
    9  * ----------------------------------------------------------------------------
   10  *
   11  * Copyright (c) 2011 The FreeBSD Foundation
   12  * All rights reserved.
   13  *
   14  * Portions of this software were developed by Julien Ridoux at the University
   15  * of Melbourne under sponsorship from the FreeBSD Foundation.
   16  *
   17  * $FreeBSD: stable/12/sys/sys/timepps.h 326408 2017-11-30 20:33:45Z pfg $
   18  *
   19  * The is a FreeBSD version of the RFC 2783 API for Pulse Per Second 
   20  * timing interfaces.  
   21  */
   22 
   23 #ifndef _SYS_TIMEPPS_H_
   24 #define _SYS_TIMEPPS_H_
   25 
   26 #include <sys/_ffcounter.h>
   27 #include <sys/ioccom.h>
   28 #include <sys/time.h>
   29 
   30 #define PPS_API_VERS_1  1
   31 
   32 typedef int pps_handle_t;       
   33 
   34 typedef unsigned pps_seq_t;
   35 
   36 typedef struct ntp_fp {
   37         unsigned int    integral;
   38         unsigned int    fractional;
   39 } ntp_fp_t;
   40 
   41 typedef union pps_timeu {
   42         struct timespec tspec;
   43         ntp_fp_t        ntpfp;
   44         unsigned long   longpad[3];
   45 } pps_timeu_t;
   46 
   47 typedef struct {
   48         pps_seq_t       assert_sequence;        /* assert event seq # */
   49         pps_seq_t       clear_sequence;         /* clear event seq # */
   50         pps_timeu_t     assert_tu;
   51         pps_timeu_t     clear_tu;
   52         int             current_mode;           /* current mode bits */
   53 } pps_info_t;
   54 
   55 typedef struct {
   56         pps_seq_t       assert_sequence;        /* assert event seq # */
   57         pps_seq_t       clear_sequence;         /* clear event seq # */
   58         pps_timeu_t     assert_tu;
   59         pps_timeu_t     clear_tu;
   60         ffcounter       assert_ffcount;         /* ffcounter on assert event */
   61         ffcounter       clear_ffcount;          /* ffcounter on clear event */
   62         int             current_mode;           /* current mode bits */
   63 } pps_info_ffc_t;
   64 
   65 #define assert_timestamp        assert_tu.tspec
   66 #define clear_timestamp         clear_tu.tspec
   67 
   68 #define assert_timestamp_ntpfp  assert_tu.ntpfp
   69 #define clear_timestamp_ntpfp   clear_tu.ntpfp
   70 
   71 typedef struct {
   72         int api_version;                        /* API version # */
   73         int mode;                               /* mode bits */
   74         pps_timeu_t assert_off_tu;
   75         pps_timeu_t clear_off_tu;
   76 } pps_params_t;
   77 
   78 #define assert_offset   assert_off_tu.tspec
   79 #define clear_offset    clear_off_tu.tspec
   80 
   81 #define assert_offset_ntpfp     assert_off_tu.ntpfp
   82 #define clear_offset_ntpfp      clear_off_tu.ntpfp
   83 
   84 
   85 #define PPS_CAPTUREASSERT       0x01
   86 #define PPS_CAPTURECLEAR        0x02
   87 #define PPS_CAPTUREBOTH         0x03
   88 
   89 #define PPS_OFFSETASSERT        0x10
   90 #define PPS_OFFSETCLEAR         0x20
   91 
   92 #define PPS_ECHOASSERT          0x40
   93 #define PPS_ECHOCLEAR           0x80
   94 
   95 #define PPS_CANWAIT             0x100
   96 #define PPS_CANPOLL             0x200
   97 
   98 #define PPS_TSFMT_TSPEC         0x1000
   99 #define PPS_TSFMT_NTPFP         0x2000
  100 
  101 #define PPS_TSCLK_FBCK          0x10000
  102 #define PPS_TSCLK_FFWD          0x20000
  103 #define PPS_TSCLK_MASK          0x30000
  104 
  105 #define PPS_KC_HARDPPS          0
  106 #define PPS_KC_HARDPPS_PLL      1
  107 #define PPS_KC_HARDPPS_FLL      2
  108 
  109 struct pps_fetch_args {
  110         int tsformat;
  111         pps_info_t      pps_info_buf;
  112         struct timespec timeout;
  113 };
  114 
  115 struct pps_fetch_ffc_args {
  116         int             tsformat;
  117         pps_info_ffc_t  pps_info_buf_ffc;
  118         struct timespec timeout;
  119 };
  120 
  121 struct pps_kcbind_args {
  122         int kernel_consumer;
  123         int edge;
  124         int tsformat;
  125 };
  126 
  127 #define PPS_IOC_CREATE          _IO('1', 1)
  128 #define PPS_IOC_DESTROY         _IO('1', 2)
  129 #define PPS_IOC_SETPARAMS       _IOW('1', 3, pps_params_t)
  130 #define PPS_IOC_GETPARAMS       _IOR('1', 4, pps_params_t)
  131 #define PPS_IOC_GETCAP          _IOR('1', 5, int)
  132 #define PPS_IOC_FETCH           _IOWR('1', 6, struct pps_fetch_args)
  133 #define PPS_IOC_KCBIND          _IOW('1', 7, struct pps_kcbind_args)
  134 #define PPS_IOC_FETCH_FFCOUNTER _IOWR('1', 8, struct pps_fetch_ffc_args)
  135 
  136 #ifdef _KERNEL
  137 
  138 struct mtx;
  139 
  140 #define KCMODE_EDGEMASK         0x03
  141 #define KCMODE_ABIFLAG          0x80000000 /* Internal use: abi-aware driver. */
  142 
  143 #define PPS_ABI_VERSION         1
  144 
  145 #define PPSFLAG_MTX_SPIN        0x01    /* Driver mtx is MTX_SPIN type. */
  146 
  147 struct pps_state {
  148         /* Capture information. */
  149         struct timehands *capth;
  150         struct fftimehands *capffth;
  151         unsigned        capgen;
  152         unsigned        capcount;
  153 
  154         /* State information. */
  155         pps_params_t    ppsparam;
  156         pps_info_t      ppsinfo;
  157         pps_info_ffc_t  ppsinfo_ffc;
  158         int             kcmode;
  159         int             ppscap;
  160         struct timecounter *ppstc;
  161         unsigned        ppscount[3];
  162         /*
  163          * The following fields are valid if the driver calls pps_init_abi().
  164          */
  165         uint16_t        driver_abi;     /* Driver sets before pps_init_abi(). */
  166         uint16_t        kernel_abi;     /* Kernel sets during pps_init_abi(). */
  167         struct mtx      *driver_mtx;    /* Optional, valid if non-NULL. */
  168         uint32_t        flags;
  169 };
  170 
  171 void pps_capture(struct pps_state *pps);
  172 void pps_event(struct pps_state *pps, int event);
  173 void pps_init(struct pps_state *pps);
  174 void pps_init_abi(struct pps_state *pps);
  175 int pps_ioctl(unsigned long cmd, caddr_t data, struct pps_state *pps);
  176 void hardpps(struct timespec *tsp, long nsec);
  177 
  178 #else /* !_KERNEL */
  179 
  180 static __inline int
  181 time_pps_create(int filedes, pps_handle_t *handle)
  182 {
  183         int error;
  184 
  185         *handle = -1;
  186         error = ioctl(filedes, PPS_IOC_CREATE, 0);
  187         if (error < 0) 
  188                 return (-1);
  189         *handle = filedes;
  190         return (0);
  191 }
  192 
  193 static __inline int
  194 time_pps_destroy(pps_handle_t handle)
  195 {
  196         return (ioctl(handle, PPS_IOC_DESTROY, 0));
  197 }
  198 
  199 static __inline int
  200 time_pps_setparams(pps_handle_t handle, const pps_params_t *ppsparams)
  201 {
  202         return (ioctl(handle, PPS_IOC_SETPARAMS, ppsparams));
  203 }
  204 
  205 static __inline int
  206 time_pps_getparams(pps_handle_t handle, pps_params_t *ppsparams)
  207 {
  208         return (ioctl(handle, PPS_IOC_GETPARAMS, ppsparams));
  209 }
  210 
  211 static __inline int 
  212 time_pps_getcap(pps_handle_t handle, int *mode)
  213 {
  214         return (ioctl(handle, PPS_IOC_GETCAP, mode));
  215 }
  216 
  217 static __inline int
  218 time_pps_fetch(pps_handle_t handle, const int tsformat,
  219         pps_info_t *ppsinfobuf, const struct timespec *timeout)
  220 {
  221         int error;
  222         struct pps_fetch_args arg;
  223 
  224         arg.tsformat = tsformat;
  225         if (timeout == NULL) {
  226                 arg.timeout.tv_sec = -1;
  227                 arg.timeout.tv_nsec = -1;
  228         } else
  229                 arg.timeout = *timeout;
  230         error = ioctl(handle, PPS_IOC_FETCH, &arg);
  231         *ppsinfobuf = arg.pps_info_buf;
  232         return (error);
  233 }
  234 
  235 static __inline int
  236 time_pps_fetch_ffc(pps_handle_t handle, const int tsformat,
  237         pps_info_ffc_t *ppsinfobuf, const struct timespec *timeout)
  238 {
  239         struct pps_fetch_ffc_args arg;
  240         int error;
  241 
  242         arg.tsformat = tsformat;
  243         if (timeout == NULL) {
  244                 arg.timeout.tv_sec = -1;
  245                 arg.timeout.tv_nsec = -1;
  246         } else {
  247                 arg.timeout = *timeout;
  248         }
  249         error = ioctl(handle, PPS_IOC_FETCH_FFCOUNTER, &arg);
  250         *ppsinfobuf = arg.pps_info_buf_ffc;
  251         return (error);
  252 }
  253 
  254 static __inline int
  255 time_pps_kcbind(pps_handle_t handle, const int kernel_consumer,
  256         const int edge, const int tsformat)
  257 {
  258         struct pps_kcbind_args arg;
  259 
  260         arg.kernel_consumer = kernel_consumer;
  261         arg.edge = edge;
  262         arg.tsformat = tsformat;
  263         return (ioctl(handle, PPS_IOC_KCBIND, &arg));
  264 }
  265 
  266 #endif /* KERNEL */
  267 
  268 #endif /* !_SYS_TIMEPPS_H_ */

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