1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
4  * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
11 	if (bt->sjw)  in can_sjw_set_default()
15 	bt->sjw = max(1U, min(bt->phase_seg1, bt->phase_seg2 / 2));  in can_sjw_set_default()
21 	if (bt->sjw > btc->sjw_max) {  in can_sjw_check()
23 				   bt->sjw, btc->sjw_max);  in can_sjw_check()
24 		return -EINVAL;  in can_sjw_check()
27 	if (bt->sjw > bt->phase_seg1) {  in can_sjw_check()
29 				   "sjw: %u greater than phase-seg1: %u",  in can_sjw_check()
30 				   bt->sjw, bt->phase_seg1);  in can_sjw_check()
31 		return -EINVAL;  in can_sjw_check()
34 	if (bt->sjw > bt->phase_seg2) {  in can_sjw_check()
36 				   "sjw: %u greater than phase-seg2: %u",  in can_sjw_check()
37 				   bt->sjw, bt->phase_seg2);  in can_sjw_check()
38 		return -EINVAL;  in can_sjw_check()
44 /* Checks the validity of the specified bit-timing parameters prop_seg,
53 	const unsigned int tseg1 = bt->prop_seg + bt->phase_seg1;  in can_fixup_bittiming()
58 	if (tseg1 < btc->tseg1_min) {  in can_fixup_bittiming()
59 		NL_SET_ERR_MSG_FMT(extack, "prop-seg + phase-seg1: %u less than tseg1-min: %u",  in can_fixup_bittiming()
60 				   tseg1, btc->tseg1_min);  in can_fixup_bittiming()
61 		return -EINVAL;  in can_fixup_bittiming()
63 	if (tseg1 > btc->tseg1_max) {  in can_fixup_bittiming()
64 		NL_SET_ERR_MSG_FMT(extack, "prop-seg + phase-seg1: %u greater than tseg1-max: %u",  in can_fixup_bittiming()
65 				   tseg1, btc->tseg1_max);  in can_fixup_bittiming()
66 		return -EINVAL;  in can_fixup_bittiming()
68 	if (bt->phase_seg2 < btc->tseg2_min) {  in can_fixup_bittiming()
69 		NL_SET_ERR_MSG_FMT(extack, "phase-seg2: %u less than tseg2-min: %u",  in can_fixup_bittiming()
70 				   bt->phase_seg2, btc->tseg2_min);  in can_fixup_bittiming()
71 		return -EINVAL;  in can_fixup_bittiming()
73 	if (bt->phase_seg2 > btc->tseg2_max) {  in can_fixup_bittiming()
74 		NL_SET_ERR_MSG_FMT(extack, "phase-seg2: %u greater than tseg2-max: %u",  in can_fixup_bittiming()
75 				   bt->phase_seg2, btc->tseg2_max);  in can_fixup_bittiming()
76 		return -EINVAL;  in can_fixup_bittiming()
85 	brp64 = (u64)priv->clock.freq * (u64)bt->tq;  in can_fixup_bittiming()
86 	if (btc->brp_inc > 1)  in can_fixup_bittiming()
87 		do_div(brp64, btc->brp_inc);  in can_fixup_bittiming()
88 	brp64 += 500000000UL - 1;  in can_fixup_bittiming()
90 	if (btc->brp_inc > 1)  in can_fixup_bittiming()
91 		brp64 *= btc->brp_inc;  in can_fixup_bittiming()
92 	bt->brp = (u32)brp64;  in can_fixup_bittiming()
94 	if (bt->brp < btc->brp_min) {  in can_fixup_bittiming()
95 		NL_SET_ERR_MSG_FMT(extack, "resulting brp: %u less than brp-min: %u",  in can_fixup_bittiming()
96 				   bt->brp, btc->brp_min);  in can_fixup_bittiming()
97 		return -EINVAL;  in can_fixup_bittiming()
99 	if (bt->brp > btc->brp_max) {  in can_fixup_bittiming()
100 		NL_SET_ERR_MSG_FMT(extack, "resulting brp: %u greater than brp-max: %u",  in can_fixup_bittiming()
101 				   bt->brp, btc->brp_max);  in can_fixup_bittiming()
102 		return -EINVAL;  in can_fixup_bittiming()
105 	bt->bitrate = priv->clock.freq / (bt->brp * can_bit_time(bt));  in can_fixup_bittiming()
106 	bt->sample_point = ((CAN_SYNC_SEG + tseg1) * 1000) / can_bit_time(bt);  in can_fixup_bittiming()
107 	bt->tq = DIV_U64_ROUND_CLOSEST(mul_u32_u32(bt->brp, NSEC_PER_SEC),  in can_fixup_bittiming()
108 				       priv->clock.freq);  in can_fixup_bittiming()
123 		if (bt->bitrate == bitrate_const[i])  in can_validate_bitrate()
128 			   bt->brp);  in can_validate_bitrate()
130 	return -EINVAL;  in can_validate_bitrate()
139 	/* Depending on the given can_bittiming parameter structure the CAN  in can_get_bittiming()
144 	if (!bt->tq && bt->bitrate && btc)  in can_get_bittiming()
146 	if (bt->tq && !bt->bitrate && btc)  in can_get_bittiming()
148 	if (!bt->tq && bt->bitrate && bitrate_const)  in can_get_bittiming()
152 	return -EINVAL;  in can_get_bittiming()