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      1 /*	$NetBSD: can_link.h,v 1.2 2017/05/27 21:02:56 bouyer Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2017 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Manuel Bouyer
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _NETCAN_CAN_LINK_H
     33 #define _NETCAN_CAN_LINK_H
     34 
     35 /*
     36  * CAN bus link-layer related commands, from the SIOCSDRVSPEC
     37  */
     38 
     39 /* get timing capabilities from HW */
     40 struct can_link_timecaps {
     41 	uint32_t cltc_prop_min; /* prop seg, in tq */
     42 	uint32_t cltc_prop_max;
     43 	uint32_t cltc_ps1_min; /* phase1 seg, in tq */
     44 	uint32_t cltc_ps1_max;
     45 	uint32_t cltc_ps2_min; /* phase 2 seg, in tq */
     46 	uint32_t cltc_ps2_max;
     47 	uint32_t cltc_sjw_max;	/* Synchronisation Jump Width */
     48 	uint32_t cltc_brp_min;	/* bit-rate prescaler */
     49 	uint32_t cltc_brp_max;
     50 	uint32_t cltc_brp_inc;
     51 	uint32_t cltc_clock_freq; /* prescaler input clock, in hz */
     52 	uint32_t cltc_linkmode_caps; /* link mode, see below */
     53 };
     54 #define CANGLINKTIMECAP	0 /* get struct can_link_timecaps */
     55 
     56 /* get/set timing parameters */
     57 struct can_link_timings {
     58 	uint32_t clt_brp;	/* prescaler value */
     59 	uint32_t clt_prop;	/* Propagation segment in tq */
     60 	uint32_t clt_ps1;	/* Phase segment 1 in tq */
     61 	uint32_t clt_ps2;	/* Phase segment 2 in tq */
     62 	uint32_t clt_sjw;	/* Synchronisation jump width in tq */
     63 };
     64 #define CANGLINKTIMINGS	1 /* get struct can_link_timings */
     65 #define CANSLINKTIMINGS	2 /* set struct can_link_timings */
     66 
     67 /* link-level modes */
     68 #define CAN_LINKMODE_LOOPBACK		0x01    /* Loopback mode */
     69 #define CAN_LINKMODE_LISTENONLY		0x02    /* Listen-only mode */
     70 #define CAN_LINKMODE_3SAMPLES		0x04    /* Triple sampling mode */
     71 #define CAN_LINKMODE_PRESUME_ACK	0x08    /* Ignore missing CAN ACKs */
     72 #define CAN_IFFBITS \
     73     "\020\1LOOPBACK\2LISTENONLY\3TRIPLESAMPLE\4PRESUMEACK"
     74 
     75 #define CANGLINKMODE	3 /* (uint32_t) get bits */
     76 #define CANSLINKMODE	4 /* (uint32_t) set bits */
     77 #define CANCLINKMODE	5 /* (uint32_t) clear bits */
     78 
     79 #endif /* _NETCAN_CAN_LINK_H */
     80 
     81