1/*	$OpenBSD: if_urtwn.c,v 1.16 2011/02/10 17:26:40 jakemsr Exp $	*/
2
3/*-
4 * Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr>
5 * Copyright (c) 2014 Kevin Lo <kevlo@FreeBSD.org>
6 * Copyright (c) 2015-2016 Andriy Voskoboinyk <avos@FreeBSD.org>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 *
20 * $FreeBSD$
21 */
22
23#ifndef IF_RTWN_RIDX_H
24#define IF_RTWN_RIDX_H
25
26/* HW rate indices. */
27#define RTWN_RIDX_CCK1		0
28#define RTWN_RIDX_CCK2		1
29#define RTWN_RIDX_CCK55		2
30#define RTWN_RIDX_CCK11		3
31#define RTWN_RIDX_OFDM6		4
32#define RTWN_RIDX_OFDM9		5
33#define RTWN_RIDX_OFDM12	6
34#define RTWN_RIDX_OFDM18	7
35#define RTWN_RIDX_OFDM24	8
36#define RTWN_RIDX_OFDM36	9
37#define RTWN_RIDX_OFDM48	10
38#define RTWN_RIDX_OFDM54	11
39
40#define RTWN_RIDX_HT_MCS_SHIFT	12
41#define RTWN_RIDX_HT_MCS(i)	(RTWN_RIDX_HT_MCS_SHIFT + (i))
42
43#define RTWN_RIDX_COUNT		28
44#define RTWN_RIDX_UNKNOWN	(uint8_t)-1
45
46#define RTWN_RATE_IS_CCK(rate)  ((rate) <= RTWN_RIDX_CCK11)
47#define RTWN_RATE_IS_OFDM(rate) \
48	((rate) >= RTWN_RIDX_OFDM6 && (rate) != RTWN_RIDX_UNKNOWN)
49
50static const uint8_t ridx2rate[] =
51	{ 2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108 };
52
53static __inline uint8_t
54rate2ridx(uint8_t rate)
55{
56	if (rate & IEEE80211_RATE_MCS) {
57		return ((rate & 0xf) + RTWN_RIDX_HT_MCS_SHIFT);
58	}
59	switch (rate) {
60	/* 11g */
61	case 12:	return 4;
62	case 18:	return 5;
63	case 24:	return 6;
64	case 36:	return 7;
65	case 48:	return 8;
66	case 72:	return 9;
67	case 96:	return 10;
68	case 108:	return 11;
69	/* 11b */
70	case 2:		return 0;
71	case 4:		return 1;
72	case 11:	return 2;
73	case 22:	return 3;
74	default:	return RTWN_RIDX_UNKNOWN;
75	}
76}
77
78/* XXX move to net80211 */
79static __inline__ uint8_t
80rtwn_ctl_mcsrate(const struct ieee80211_rate_table *rt, uint8_t ridx)
81{
82	uint8_t cix, rate;
83
84	/* Check if we are using MCS rate. */
85	KASSERT(ridx >= RTWN_RIDX_HT_MCS(0) && ridx != RTWN_RIDX_UNKNOWN,
86	    ("bad mcs rate index %d", ridx));
87
88	rate = (ridx - RTWN_RIDX_HT_MCS(0)) | IEEE80211_RATE_MCS;
89	cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex;
90	KASSERT(cix != (uint8_t)-1, ("rate %d (%d) has no info", rate, ridx));
91	return rt->info[cix].dot11Rate;
92}
93
94#endif	/* IF_RTWN_RIDX_H */
95