2 * Copyright (c) 2010 Broadcom Corporation
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 #include <linux/kernel.h>
17 #include <linux/module.h>
19 #include <proto/802.11.h>
27 #include "wlc_types.h"
35 /* Rate info per rate: It tells whether a rate is ofdm or not and its phy_rate value */
36 const u8 rate_info[WLC_MAXRATE + 1] = {
37 /* 0 1 2 3 4 5 6 7 8 9 */
38 /* 0 */ 0x00, 0x00, 0x0a, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00,
39 /* 10 */ 0x00, 0x37, 0x8b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8f, 0x00,
40 /* 20 */ 0x00, 0x00, 0x6e, 0x00, 0x8a, 0x00, 0x00, 0x00, 0x00, 0x00,
41 /* 30 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8e, 0x00, 0x00, 0x00,
42 /* 40 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x89, 0x00,
43 /* 50 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
44 /* 60 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
45 /* 70 */ 0x00, 0x00, 0x8d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
46 /* 80 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
47 /* 90 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x00, 0x00, 0x00,
48 /* 100 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8c
51 /* rates are in units of Kbps */
52 const mcs_info_t mcs_table[MCS_TABLE_SIZE] = {
53 /* MCS 0: SS 1, MOD: BPSK, CR 1/2 */
54 {6500, 13500, CEIL(6500 * 10, 9), CEIL(13500 * 10, 9), 0x00,
56 /* MCS 1: SS 1, MOD: QPSK, CR 1/2 */
57 {13000, 27000, CEIL(13000 * 10, 9), CEIL(27000 * 10, 9), 0x08,
59 /* MCS 2: SS 1, MOD: QPSK, CR 3/4 */
60 {19500, 40500, CEIL(19500 * 10, 9), CEIL(40500 * 10, 9), 0x0A,
62 /* MCS 3: SS 1, MOD: 16QAM, CR 1/2 */
63 {26000, 54000, CEIL(26000 * 10, 9), CEIL(54000 * 10, 9), 0x10,
65 /* MCS 4: SS 1, MOD: 16QAM, CR 3/4 */
66 {39000, 81000, CEIL(39000 * 10, 9), CEIL(81000 * 10, 9), 0x12,
68 /* MCS 5: SS 1, MOD: 64QAM, CR 2/3 */
69 {52000, 108000, CEIL(52000 * 10, 9), CEIL(108000 * 10, 9), 0x19,
71 /* MCS 6: SS 1, MOD: 64QAM, CR 3/4 */
72 {58500, 121500, CEIL(58500 * 10, 9), CEIL(121500 * 10, 9), 0x1A,
74 /* MCS 7: SS 1, MOD: 64QAM, CR 5/6 */
75 {65000, 135000, CEIL(65000 * 10, 9), CEIL(135000 * 10, 9), 0x1C,
77 /* MCS 8: SS 2, MOD: BPSK, CR 1/2 */
78 {13000, 27000, CEIL(13000 * 10, 9), CEIL(27000 * 10, 9), 0x40,
80 /* MCS 9: SS 2, MOD: QPSK, CR 1/2 */
81 {26000, 54000, CEIL(26000 * 10, 9), CEIL(54000 * 10, 9), 0x48,
83 /* MCS 10: SS 2, MOD: QPSK, CR 3/4 */
84 {39000, 81000, CEIL(39000 * 10, 9), CEIL(81000 * 10, 9), 0x4A,
86 /* MCS 11: SS 2, MOD: 16QAM, CR 1/2 */
87 {52000, 108000, CEIL(52000 * 10, 9), CEIL(108000 * 10, 9), 0x50,
89 /* MCS 12: SS 2, MOD: 16QAM, CR 3/4 */
90 {78000, 162000, CEIL(78000 * 10, 9), CEIL(162000 * 10, 9), 0x52,
92 /* MCS 13: SS 2, MOD: 64QAM, CR 2/3 */
93 {104000, 216000, CEIL(104000 * 10, 9), CEIL(216000 * 10, 9), 0x59,
95 /* MCS 14: SS 2, MOD: 64QAM, CR 3/4 */
96 {117000, 243000, CEIL(117000 * 10, 9), CEIL(243000 * 10, 9), 0x5A,
98 /* MCS 15: SS 2, MOD: 64QAM, CR 5/6 */
99 {130000, 270000, CEIL(130000 * 10, 9), CEIL(270000 * 10, 9), 0x5C,
101 /* MCS 16: SS 3, MOD: BPSK, CR 1/2 */
102 {19500, 40500, CEIL(19500 * 10, 9), CEIL(40500 * 10, 9), 0x80,
104 /* MCS 17: SS 3, MOD: QPSK, CR 1/2 */
105 {39000, 81000, CEIL(39000 * 10, 9), CEIL(81000 * 10, 9), 0x88,
107 /* MCS 18: SS 3, MOD: QPSK, CR 3/4 */
108 {58500, 121500, CEIL(58500 * 10, 9), CEIL(121500 * 10, 9), 0x8A,
110 /* MCS 19: SS 3, MOD: 16QAM, CR 1/2 */
111 {78000, 162000, CEIL(78000 * 10, 9), CEIL(162000 * 10, 9), 0x90,
113 /* MCS 20: SS 3, MOD: 16QAM, CR 3/4 */
114 {117000, 243000, CEIL(117000 * 10, 9), CEIL(243000 * 10, 9), 0x92,
116 /* MCS 21: SS 3, MOD: 64QAM, CR 2/3 */
117 {156000, 324000, CEIL(156000 * 10, 9), CEIL(324000 * 10, 9), 0x99,
119 /* MCS 22: SS 3, MOD: 64QAM, CR 3/4 */
120 {175500, 364500, CEIL(175500 * 10, 9), CEIL(364500 * 10, 9), 0x9A,
122 /* MCS 23: SS 3, MOD: 64QAM, CR 5/6 */
123 {195000, 405000, CEIL(195000 * 10, 9), CEIL(405000 * 10, 9), 0x9B,
125 /* MCS 24: SS 4, MOD: BPSK, CR 1/2 */
126 {26000, 54000, CEIL(26000 * 10, 9), CEIL(54000 * 10, 9), 0xC0,
128 /* MCS 25: SS 4, MOD: QPSK, CR 1/2 */
129 {52000, 108000, CEIL(52000 * 10, 9), CEIL(108000 * 10, 9), 0xC8,
131 /* MCS 26: SS 4, MOD: QPSK, CR 3/4 */
132 {78000, 162000, CEIL(78000 * 10, 9), CEIL(162000 * 10, 9), 0xCA,
134 /* MCS 27: SS 4, MOD: 16QAM, CR 1/2 */
135 {104000, 216000, CEIL(104000 * 10, 9), CEIL(216000 * 10, 9), 0xD0,
137 /* MCS 28: SS 4, MOD: 16QAM, CR 3/4 */
138 {156000, 324000, CEIL(156000 * 10, 9), CEIL(324000 * 10, 9), 0xD2,
140 /* MCS 29: SS 4, MOD: 64QAM, CR 2/3 */
141 {208000, 432000, CEIL(208000 * 10, 9), CEIL(432000 * 10, 9), 0xD9,
143 /* MCS 30: SS 4, MOD: 64QAM, CR 3/4 */
144 {234000, 486000, CEIL(234000 * 10, 9), CEIL(486000 * 10, 9), 0xDA,
146 /* MCS 31: SS 4, MOD: 64QAM, CR 5/6 */
147 {260000, 540000, CEIL(260000 * 10, 9), CEIL(540000 * 10, 9), 0xDB,
149 /* MCS 32: SS 1, MOD: BPSK, CR 1/2 */
150 {0, 6000, 0, CEIL(6000 * 10, 9), 0x00, WLC_RATE_6M},
153 /* phycfg for legacy OFDM frames: code rate, modulation scheme, spatial streams
154 * Number of spatial streams: always 1
155 * other fields: refer to table 78 of section 17.3.2.2 of the original .11a standard
157 typedef struct legacy_phycfg {
158 u32 rate_ofdm; /* ofdm mac rate */
159 u8 tx_phy_ctl3; /* phy ctl byte 3, code rate, modulation type, # of streams */
162 #define LEGACY_PHYCFG_TABLE_SIZE 12 /* Number of legacy_rate_cfg entries in the table */
164 /* In CCK mode LPPHY overloads OFDM Modulation bits with CCK Data Rate */
165 /* Eventually MIMOPHY would also be converted to this format */
166 /* 0 = 1Mbps; 1 = 2Mbps; 2 = 5.5Mbps; 3 = 11Mbps */
167 static const legacy_phycfg_t legacy_phycfg_table[LEGACY_PHYCFG_TABLE_SIZE] = {
168 {WLC_RATE_1M, 0x00}, /* CCK 1Mbps, data rate 0 */
169 {WLC_RATE_2M, 0x08}, /* CCK 2Mbps, data rate 1 */
170 {WLC_RATE_5M5, 0x10}, /* CCK 5.5Mbps, data rate 2 */
171 {WLC_RATE_11M, 0x18}, /* CCK 11Mbps, data rate 3 */
172 {WLC_RATE_6M, 0x00}, /* OFDM 6Mbps, code rate 1/2, BPSK, 1 spatial stream */
173 {WLC_RATE_9M, 0x02}, /* OFDM 9Mbps, code rate 3/4, BPSK, 1 spatial stream */
174 {WLC_RATE_12M, 0x08}, /* OFDM 12Mbps, code rate 1/2, QPSK, 1 spatial stream */
175 {WLC_RATE_18M, 0x0A}, /* OFDM 18Mbps, code rate 3/4, QPSK, 1 spatial stream */
176 {WLC_RATE_24M, 0x10}, /* OFDM 24Mbps, code rate 1/2, 16-QAM, 1 spatial stream */
177 {WLC_RATE_36M, 0x12}, /* OFDM 36Mbps, code rate 3/4, 16-QAM, 1 spatial stream */
178 {WLC_RATE_48M, 0x19}, /* OFDM 48Mbps, code rate 2/3, 64-QAM, 1 spatial stream */
179 {WLC_RATE_54M, 0x1A}, /* OFDM 54Mbps, code rate 3/4, 64-QAM, 1 spatial stream */
182 /* Hardware rates (also encodes default basic rates) */
184 const wlc_rateset_t cck_ofdm_mimo_rates = {
186 { /* 1b, 2b, 5.5b, 6, 9, 11b, 12, 18, 24, 36, 48, 54 Mbps */
187 0x82, 0x84, 0x8b, 0x0c, 0x12, 0x96, 0x18, 0x24, 0x30, 0x48, 0x60,
190 {0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
191 0x00, 0x00, 0x00, 0x00}
194 const wlc_rateset_t ofdm_mimo_rates = {
196 { /* 6b, 9, 12b, 18, 24b, 36, 48, 54 Mbps */
197 0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c},
199 {0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
200 0x00, 0x00, 0x00, 0x00}
203 /* Default ratesets that include MCS32 for 40BW channels */
204 const wlc_rateset_t cck_ofdm_40bw_mimo_rates = {
206 { /* 1b, 2b, 5.5b, 6, 9, 11b, 12, 18, 24, 36, 48, 54 Mbps */
207 0x82, 0x84, 0x8b, 0x0c, 0x12, 0x96, 0x18, 0x24, 0x30, 0x48, 0x60,
210 {0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
211 0x00, 0x00, 0x00, 0x00}
214 const wlc_rateset_t ofdm_40bw_mimo_rates = {
216 { /* 6b, 9, 12b, 18, 24b, 36, 48, 54 Mbps */
217 0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c},
219 {0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
220 0x00, 0x00, 0x00, 0x00}
223 const wlc_rateset_t cck_ofdm_rates = {
225 { /* 1b, 2b, 5.5b, 6, 9, 11b, 12, 18, 24, 36, 48, 54 Mbps */
226 0x82, 0x84, 0x8b, 0x0c, 0x12, 0x96, 0x18, 0x24, 0x30, 0x48, 0x60,
229 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
230 0x00, 0x00, 0x00, 0x00}
233 const wlc_rateset_t gphy_legacy_rates = {
235 { /* 1b, 2b, 5.5b, 11b Mbps */
236 0x82, 0x84, 0x8b, 0x96},
238 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
239 0x00, 0x00, 0x00, 0x00}
242 const wlc_rateset_t ofdm_rates = {
244 { /* 6b, 9, 12b, 18, 24b, 36, 48, 54 Mbps */
245 0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c},
247 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
248 0x00, 0x00, 0x00, 0x00}
251 const wlc_rateset_t cck_rates = {
253 { /* 1b, 2b, 5.5, 11 Mbps */
254 0x82, 0x84, 0x0b, 0x16},
256 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
257 0x00, 0x00, 0x00, 0x00}
260 static bool wlc_rateset_valid(wlc_rateset_t *rs, bool check_brate);
262 /* check if rateset is valid.
263 * if check_brate is true, rateset without a basic rate is considered NOT valid.
265 static bool wlc_rateset_valid(wlc_rateset_t *rs, bool check_brate)
275 /* error if no basic rates */
276 for (idx = 0; idx < rs->count; idx++) {
277 if (rs->rates[idx] & WLC_RATE_FLAG)
283 void wlc_rateset_mcs_upd(wlc_rateset_t *rs, u8 txstreams)
286 for (i = txstreams; i < MAX_STREAMS_SUPPORTED; i++)
290 /* filter based on hardware rateset, and sort filtered rateset with basic bit(s) preserved,
291 * and check if resulting rateset is valid.
294 wlc_rate_hwrs_filter_sort_validate(wlc_rateset_t *rs,
295 const wlc_rateset_t *hw_rs,
296 bool check_brate, u8 txstreams)
298 u8 rateset[WLC_MAXRATE + 1];
303 memset(rateset, 0, sizeof(rateset));
306 for (i = 0; i < count; i++) {
307 /* mask off "basic rate" bit, WLC_RATE_FLAG */
308 r = (int)rs->rates[i] & RATE_MASK;
309 if ((r > WLC_MAXRATE) || (rate_info[r] == 0)) {
312 rateset[r] = rs->rates[i]; /* preserve basic bit! */
315 /* fill out the rates in order, looking at only supported rates */
317 for (i = 0; i < hw_rs->count; i++) {
318 r = hw_rs->rates[i] & RATE_MASK;
319 ASSERT(r <= WLC_MAXRATE);
321 rs->rates[count++] = rateset[r];
326 /* only set the mcs rate bit if the equivalent hw mcs bit is set */
327 for (i = 0; i < MCSSET_LEN; i++)
328 rs->mcs[i] = (rs->mcs[i] & hw_rs->mcs[i]);
330 if (wlc_rateset_valid(rs, check_brate))
336 /* caluclate the rate of a rx'd frame and return it as a ratespec */
337 ratespec_t BCMFASTPATH wlc_compute_rspec(d11rxhdr_t *rxh, u8 *plcp)
340 ratespec_t rspec = PHY_TXC1_BW_20MHZ << RSPEC_BW_SHIFT;
343 ((rxh->RxChan & RXS_CHAN_PHYTYPE_MASK) >> RXS_CHAN_PHYTYPE_SHIFT);
345 if ((phy_type == PHY_TYPE_N) || (phy_type == PHY_TYPE_SSN) ||
346 (phy_type == PHY_TYPE_LCN) || (phy_type == PHY_TYPE_HT)) {
347 switch (rxh->PhyRxStatus_0 & PRXS0_FT_MASK) {
350 CCK_PHY2MAC_RATE(((cck_phy_hdr_t *) plcp)->signal);
354 OFDM_PHY2MAC_RATE(((ofdm_phy_hdr_t *) plcp)->
358 rspec = (plcp[0] & MIMO_PLCP_MCS_MASK) | RSPEC_MIMORATE;
359 if (plcp[0] & MIMO_PLCP_40MHZ) {
360 /* indicate rspec is for 40 MHz mode */
361 rspec &= ~RSPEC_BW_MASK;
362 rspec |= (PHY_TXC1_BW_40MHZ << RSPEC_BW_SHIFT);
372 if (PLCP3_ISSGI(plcp[3]))
373 rspec |= RSPEC_SHORT_GI;
375 if ((phy_type == PHY_TYPE_A) || (rxh->PhyRxStatus_0 & PRXS0_OFDM))
376 rspec = OFDM_PHY2MAC_RATE(((ofdm_phy_hdr_t *) plcp)->rlpt[0]);
378 rspec = CCK_PHY2MAC_RATE(((cck_phy_hdr_t *) plcp)->signal);
383 /* copy rateset src to dst as-is (no masking or sorting) */
384 void wlc_rateset_copy(const wlc_rateset_t *src, wlc_rateset_t *dst)
386 memcpy(dst, src, sizeof(wlc_rateset_t));
390 * Copy and selectively filter one rateset to another.
391 * 'basic_only' means only copy basic rates.
392 * 'rates' indicates cck (11b) and ofdm rates combinations.
396 * 'xmask' is the copy mask (typically 0x7f or 0xff).
399 wlc_rateset_filter(wlc_rateset_t *src, wlc_rateset_t *dst, bool basic_only,
400 u8 rates, uint xmask, bool mcsallow)
407 for (i = 0; i < src->count; i++) {
409 if (basic_only && !(r & WLC_RATE_FLAG))
411 if ((rates == WLC_RATES_CCK) && IS_OFDM((r & RATE_MASK)))
413 if ((rates == WLC_RATES_OFDM) && IS_CCK((r & RATE_MASK)))
415 dst->rates[count++] = r & xmask;
418 dst->htphy_membership = src->htphy_membership;
420 if (mcsallow && rates != WLC_RATES_CCK)
421 memcpy(&dst->mcs[0], &src->mcs[0], MCSSET_LEN);
423 wlc_rateset_mcs_clear(dst);
426 /* select rateset for a given phy_type and bandtype and filter it, sort it
427 * and fill rs_tgt with result
430 wlc_rateset_default(wlc_rateset_t *rs_tgt, const wlc_rateset_t *rs_hw,
431 uint phy_type, int bandtype, bool cck_only, uint rate_mask,
432 bool mcsallow, u8 bw, u8 txstreams)
434 const wlc_rateset_t *rs_dflt;
435 wlc_rateset_t rs_sel;
436 if ((PHYTYPE_IS(phy_type, PHY_TYPE_HT)) ||
437 (PHYTYPE_IS(phy_type, PHY_TYPE_N)) ||
438 (PHYTYPE_IS(phy_type, PHY_TYPE_LCN)) ||
439 (PHYTYPE_IS(phy_type, PHY_TYPE_SSN))) {
440 if (BAND_5G(bandtype)) {
441 rs_dflt = (bw == WLC_20_MHZ ?
442 &ofdm_mimo_rates : &ofdm_40bw_mimo_rates);
444 rs_dflt = (bw == WLC_20_MHZ ?
445 &cck_ofdm_mimo_rates :
446 &cck_ofdm_40bw_mimo_rates);
448 } else if (PHYTYPE_IS(phy_type, PHY_TYPE_LP)) {
449 rs_dflt = (BAND_5G(bandtype)) ? &ofdm_rates : &cck_ofdm_rates;
450 } else if (PHYTYPE_IS(phy_type, PHY_TYPE_A)) {
451 rs_dflt = &ofdm_rates;
452 } else if (PHYTYPE_IS(phy_type, PHY_TYPE_G)) {
453 rs_dflt = &cck_ofdm_rates;
455 ASSERT(0); /* should not happen */
456 rs_dflt = &cck_rates; /* force cck */
459 /* if hw rateset is not supplied, assign selected rateset to it */
463 wlc_rateset_copy(rs_dflt, &rs_sel);
464 wlc_rateset_mcs_upd(&rs_sel, txstreams);
465 wlc_rateset_filter(&rs_sel, rs_tgt, false,
466 cck_only ? WLC_RATES_CCK : WLC_RATES_CCK_OFDM,
467 rate_mask, mcsallow);
468 wlc_rate_hwrs_filter_sort_validate(rs_tgt, rs_hw, false,
469 mcsallow ? txstreams : 1);
472 s16 BCMFASTPATH wlc_rate_legacy_phyctl(uint rate)
475 for (i = 0; i < LEGACY_PHYCFG_TABLE_SIZE; i++)
476 if (rate == legacy_phycfg_table[i].rate_ofdm)
477 return legacy_phycfg_table[i].tx_phy_ctl3;
482 void wlc_rateset_mcs_clear(wlc_rateset_t *rateset)
485 for (i = 0; i < MCSSET_LEN; i++)
489 void wlc_rateset_mcs_build(wlc_rateset_t *rateset, u8 txstreams)
491 memcpy(&rateset->mcs[0], &cck_ofdm_mimo_rates.mcs[0], MCSSET_LEN);
492 wlc_rateset_mcs_upd(rateset, txstreams);
495 /* Based on bandwidth passed, allow/disallow MCS 32 in the rateset */
496 void wlc_rateset_bw_mcs_filter(wlc_rateset_t *rateset, u8 bw)
498 if (bw == WLC_40_MHZ)
499 setbit(rateset->mcs, 32);
501 clrbit(rateset->mcs, 32);