summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/broadcom/brcm80211/brcmsmac/rate.h
blob: 5bb88b78ed648407dbbcb39db73d86ea503d76c9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _BRCM_RATE_H_
#define _BRCM_RATE_H_

#include "types.h"
#include "d11.h"
#include "phy_hal.h"

extern const u8 rate_info[];
extern const struct brcms_c_rateset cck_ofdm_mimo_rates;
extern const struct brcms_c_rateset ofdm_mimo_rates;
extern const struct brcms_c_rateset cck_ofdm_rates;
extern const struct brcms_c_rateset ofdm_rates;
extern const struct brcms_c_rateset cck_rates;
extern const struct brcms_c_rateset gphy_legacy_rates;
extern const struct brcms_c_rateset rate_limit_1_2;

struct brcms_mcs_info {
	/* phy rate in kbps [20Mhz] */
	u32 phy_rate_20;
	/* phy rate in kbps [40Mhz] */
	u32 phy_rate_40;
	/* phy rate in kbps [20Mhz] with SGI */
	u32 phy_rate_20_sgi;
	/* phy rate in kbps [40Mhz] with SGI */
	u32 phy_rate_40_sgi;
	/* phy ctl byte 3, code rate, modulation type, # of streams */
	u8 tx_phy_ctl3;
	/* matching legacy ofdm rate in 500bkps */
	u8 leg_ofdm;
};

#define BRCMS_MAXMCS	32	/* max valid mcs index */
#define MCS_TABLE_SIZE	33	/* Number of mcs entries in the table */
extern const struct brcms_mcs_info mcs_table[];

#define MCS_TXS_MASK	0xc0	/* num tx streams - 1 bit mask */
#define MCS_TXS_SHIFT	6	/* num tx streams - 1 bit shift */

/* returns num tx streams - 1 */
static inline u8 mcs_2_txstreams(u8 mcs)
{
	return (mcs_table[mcs].tx_phy_ctl3 & MCS_TXS_MASK) >> MCS_TXS_SHIFT;
}

static inline uint mcs_2_rate(u8 mcs, bool is40, bool sgi)
{
	if (sgi) {
		if (is40)
			return mcs_table[mcs].phy_rate_40_sgi;
		return mcs_table[mcs].phy_rate_20_sgi;
	}
	if (is40)
		return mcs_table[mcs].phy_rate_40;

	return mcs_table[mcs].phy_rate_20;
}

/* Macro to use the rate_info table */
#define	BRCMS_RATE_MASK_FULL 0xff /* Rate value mask with basic rate flag */

/*
 * rate spec : holds rate and mode specific information required to generate a
 * tx frame. Legacy CCK and OFDM information is held in the same manner as was
 * done in the past (in the lower byte) the upper 3 bytes primarily hold MIMO
 * specific information
 */

/* rate spec bit fields */

/* Either 500Kbps units or MIMO MCS idx */
#define RSPEC_RATE_MASK		0x0000007F
/* mimo MCS is stored in RSPEC_RATE_MASK */
#define RSPEC_MIMORATE		0x08000000
/* mimo bw mask */
#define RSPEC_BW_MASK		0x00000700
/* mimo bw shift */
#define RSPEC_BW_SHIFT		8
/* mimo Space/Time/Frequency mode mask */
#define RSPEC_STF_MASK		0x00003800
/* mimo Space/Time/Frequency mode shift */
#define RSPEC_STF_SHIFT		11
/* mimo coding type mask */
#define RSPEC_CT_MASK		0x0000C000
/* mimo coding type shift */
#define RSPEC_CT_SHIFT		14
/* mimo num STC streams per PLCP defn. */
#define RSPEC_STC_MASK		0x00300000
/* mimo num STC streams per PLCP defn. */
#define RSPEC_STC_SHIFT		20
/* mimo bit indicates adv coding in use */
#define RSPEC_LDPC_CODING	0x00400000
/* mimo bit indicates short GI in use */
#define RSPEC_SHORT_GI		0x00800000
/* bit indicates override both rate & mode */
#define RSPEC_OVERRIDE		0x80000000
/* bit indicates override rate only */
#define RSPEC_OVERRIDE_MCS_ONLY 0x40000000

static inline bool rspec_active(u32 rspec)
{
	return rspec & (RSPEC_RATE_MASK | RSPEC_MIMORATE);
}

static inline u8 rspec_phytxbyte2(u32 rspec)
{
	return (rspec & 0xff00) >> 8;
}

static inline u32 rspec_get_bw(u32 rspec)
{
	return (rspec & RSPEC_BW_MASK) >> RSPEC_BW_SHIFT;
}

static inline bool rspec_issgi(u32 rspec)
{
	return (rspec & RSPEC_SHORT_GI) == RSPEC_SHORT_GI;
}

static inline bool rspec_is40mhz(u32 rspec)
{
	u32 bw = rspec_get_bw(rspec);

	return bw == PHY_TXC1_BW_40MHZ || bw == PHY_TXC1_BW_40MHZ_DUP;
}

static inline uint rspec2rate(u32 rspec)
{
	if (rspec & RSPEC_MIMORATE)
		return mcs_2_rate(rspec & RSPEC_RATE_MASK, rspec_is40mhz(rspec),
				  rspec_issgi(rspec));
	return rspec & RSPEC_RATE_MASK;
}

static inline u8 rspec_mimoplcp3(u32 rspec)
{
	return (rspec & 0xf00000) >> 16;
}

static inline bool plcp3_issgi(u8 plcp)
{
	return (plcp & (RSPEC_SHORT_GI >> 16)) != 0;
}

static inline uint rspec_stc(u32 rspec)
{
	return (rspec & RSPEC_STC_MASK) >> RSPEC_STC_SHIFT;
}

static inline uint rspec_stf(u32 rspec)
{
	return (rspec & RSPEC_STF_MASK) >> RSPEC_STF_SHIFT;
}

static inline bool is_mcs_rate(u32 ratespec)
{
	return (ratespec & RSPEC_MIMORATE) != 0;
}

static inline bool is_ofdm_rate(u32 ratespec)
{
	return !is_mcs_rate(ratespec) &&
	       (rate_info[ratespec & RSPEC_RATE_MASK] & BRCMS_RATE_FLAG);
}

static inline bool is_cck_rate(u32 ratespec)
{
	u32 rate = (ratespec & BRCMS_RATE_MASK);

	return !is_mcs_rate(ratespec) && (
			rate == BRCM_RATE_1M || rate == BRCM_RATE_2M ||
			rate == BRCM_RATE_5M5 || rate == BRCM_RATE_11M);
}

static inline bool is_single_stream(u8 mcs)
{
	return mcs <= HIGHEST_SINGLE_STREAM_MCS || mcs == 32;
}

static inline u8 cck_rspec(u8 cck)
{
	return cck & RSPEC_RATE_MASK;
}

/* Convert encoded rate value in plcp header to numerical rates in 500 KHz
 * increments */
static inline u8 ofdm_phy2mac_rate(u8 rlpt)
{
	return wlc_phy_get_ofdm_rate_lookup()[rlpt & 0x7];
}

static inline u8 cck_phy2mac_rate(u8 signal)
{
	return signal/5;
}

/* Rates specified in brcms_c_rateset_filter() */
#define BRCMS_RATES_CCK_OFDM	0
#define BRCMS_RATES_CCK		1
#define BRCMS_RATES_OFDM		2

/* sanitize, and sort a rateset with the basic bit(s) preserved, validate
 * rateset */
bool brcms_c_rate_hwrs_filter_sort_validate(struct brcms_c_rateset *rs,
					    const struct brcms_c_rateset *hw_rs,
					    bool check_brate, u8 txstreams);
/* copy rateset src to dst as-is (no masking or sorting) */
void brcms_c_rateset_copy(const struct brcms_c_rateset *src,
			  struct brcms_c_rateset *dst);

/* would be nice to have these documented ... */
u32 brcms_c_compute_rspec(struct d11rxhdr *rxh, u8 *plcp);

void brcms_c_rateset_filter(struct brcms_c_rateset *src,
			    struct brcms_c_rateset *dst, bool basic_only,
			    u8 rates, uint xmask, bool mcsallow);

void brcms_c_rateset_default(struct brcms_c_rateset *rs_tgt,
			     const struct brcms_c_rateset *rs_hw, uint phy_type,
			     int bandtype, bool cck_only, uint rate_mask,
			     bool mcsallow, u8 bw, u8 txstreams);

s16 brcms_c_rate_legacy_phyctl(uint rate);

void brcms_c_rateset_mcs_upd(struct brcms_c_rateset *rs, u8 txstreams);
void brcms_c_rateset_mcs_clear(struct brcms_c_rateset *rateset);
void brcms_c_rateset_mcs_build(struct brcms_c_rateset *rateset, u8 txstreams);
void brcms_c_rateset_bw_mcs_filter(struct brcms_c_rateset *rateset, u8 bw);

#endif				/* _BRCM_RATE_H_ */