1 /*
2 * Copyright (c) 2010 Broadcom Corporation
3 *
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.
7 *
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.
15 */
16
17 #include <net/mac80211.h>
18
19 #include "types.h"
20 #include "d11.h"
21 #include "rate.h"
22 #include "phy/phy_hal.h"
23 #include "channel.h"
24 #include "main.h"
25 #include "stf.h"
26
27 #define MIN_SPATIAL_EXPANSION 0
28 #define MAX_SPATIAL_EXPANSION 1
29
30 #define BRCMS_STF_SS_STBC_RX(wlc) (BRCMS_ISNPHY(wlc->band) && \
31 NREV_GT(wlc->band->phyrev, 3) && NREV_LE(wlc->band->phyrev, 6))
32
33 #define NSTS_1 1
34 #define NSTS_2 2
35 #define NSTS_3 3
36 #define NSTS_4 4
37
38 static const u8 txcore_default[5] = {
39 (0), /* bitmap of the core enabled */
40 (0x01), /* For Nsts = 1, enable core 1 */
41 (0x03), /* For Nsts = 2, enable core 1 & 2 */
42 (0x07), /* For Nsts = 3, enable core 1, 2 & 3 */
43 (0x0f) /* For Nsts = 4, enable all cores */
44 };
45
brcms_c_stf_stbc_rx_ht_update(struct brcms_c_info * wlc,int val)46 static void brcms_c_stf_stbc_rx_ht_update(struct brcms_c_info *wlc, int val)
47 {
48 /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
49 if (BRCMS_STF_SS_STBC_RX(wlc)) {
50 if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
51 return;
52 }
53
54 if (wlc->pub->up) {
55 brcms_c_update_beacon(wlc);
56 brcms_c_update_probe_resp(wlc, true);
57 }
58 }
59
60 /*
61 * every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to
62 * turn on/off txchain.
63 */
brcms_c_tempsense_upd(struct brcms_c_info * wlc)64 void brcms_c_tempsense_upd(struct brcms_c_info *wlc)
65 {
66 struct brcms_phy_pub *pi = wlc->band->pi;
67 uint active_chains, txchain;
68
69 /* Check if the chip is too hot. Disable one Tx chain, if it is */
70 /* high 4 bits are for Rx chain, low 4 bits are for Tx chain */
71 active_chains = wlc_phy_stf_chain_active_get(pi);
72 txchain = active_chains & 0xf;
73
74 if (wlc->stf->txchain == wlc->stf->hw_txchain) {
75 if (txchain && (txchain < wlc->stf->hw_txchain))
76 /* turn off 1 tx chain */
77 brcms_c_stf_txchain_set(wlc, txchain, true);
78 } else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
79 if (txchain == wlc->stf->hw_txchain)
80 /* turn back on txchain */
81 brcms_c_stf_txchain_set(wlc, txchain, true);
82 }
83 }
84
85 void
brcms_c_stf_ss_algo_channel_get(struct brcms_c_info * wlc,u16 * ss_algo_channel,u16 chanspec)86 brcms_c_stf_ss_algo_channel_get(struct brcms_c_info *wlc, u16 *ss_algo_channel,
87 u16 chanspec)
88 {
89 struct tx_power power;
90 u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;
91
92 /* Clear previous settings */
93 *ss_algo_channel = 0;
94
95 if (!wlc->pub->up) {
96 *ss_algo_channel = (u16) -1;
97 return;
98 }
99
100 wlc_phy_txpower_get_current(wlc->band->pi, &power,
101 CHSPEC_CHANNEL(chanspec));
102
103 siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
104 WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
105 cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
106 WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
107 stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
108 WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;
109
110 /* criteria to choose stf mode */
111
112 /*
113 * the "+3dbm (12 0.25db units)" is to account for the fact that with
114 * CDD, tx occurs on both chains
115 */
116 if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
117 setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
118 else
119 setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);
120
121 /*
122 * STBC is ORed into to algo channel as STBC requires per-packet SCB
123 * capability check so cannot be default mode of operation. One of
124 * SISO, CDD have to be set
125 */
126 if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
127 setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
128 }
129
brcms_c_stf_stbc_tx_set(struct brcms_c_info * wlc,s32 int_val)130 static bool brcms_c_stf_stbc_tx_set(struct brcms_c_info *wlc, s32 int_val)
131 {
132 if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON))
133 return false;
134
135 if ((int_val == ON) && (wlc->stf->txstreams == 1))
136 return false;
137
138 wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
139 wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;
140
141 return true;
142 }
143
brcms_c_stf_stbc_rx_set(struct brcms_c_info * wlc,s32 int_val)144 bool brcms_c_stf_stbc_rx_set(struct brcms_c_info *wlc, s32 int_val)
145 {
146 if ((int_val != HT_CAP_RX_STBC_NO)
147 && (int_val != HT_CAP_RX_STBC_ONE_STREAM))
148 return false;
149
150 if (BRCMS_STF_SS_STBC_RX(wlc)) {
151 if ((int_val != HT_CAP_RX_STBC_NO)
152 && (wlc->stf->rxstreams == 1))
153 return false;
154 }
155
156 brcms_c_stf_stbc_rx_ht_update(wlc, int_val);
157 return true;
158 }
159
brcms_c_stf_txcore_set(struct brcms_c_info * wlc,u8 Nsts,u8 core_mask)160 static int brcms_c_stf_txcore_set(struct brcms_c_info *wlc, u8 Nsts,
161 u8 core_mask)
162 {
163 BCMMSG(wlc->wiphy, "wl%d: Nsts %d core_mask %x\n",
164 wlc->pub->unit, Nsts, core_mask);
165
166 if (hweight8(core_mask) > wlc->stf->txstreams)
167 core_mask = 0;
168
169 if ((hweight8(core_mask) == wlc->stf->txstreams) &&
170 ((core_mask & ~wlc->stf->txchain)
171 || !(core_mask & wlc->stf->txchain)))
172 core_mask = wlc->stf->txchain;
173
174 wlc->stf->txcore[Nsts] = core_mask;
175 /* Nsts = 1..4, txcore index = 1..4 */
176 if (Nsts == 1) {
177 /* Needs to update beacon and ucode generated response
178 * frames when 1 stream core map changed
179 */
180 wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
181 brcms_b_txant_set(wlc->hw, wlc->stf->phytxant);
182 if (wlc->clk) {
183 brcms_c_suspend_mac_and_wait(wlc);
184 brcms_c_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
185 brcms_c_enable_mac(wlc);
186 }
187 }
188
189 return 0;
190 }
191
brcms_c_stf_spatial_policy_set(struct brcms_c_info * wlc,int val)192 static int brcms_c_stf_spatial_policy_set(struct brcms_c_info *wlc, int val)
193 {
194 int i;
195 u8 core_mask = 0;
196
197 BCMMSG(wlc->wiphy, "wl%d: val %x\n", wlc->pub->unit, val);
198
199 wlc->stf->spatial_policy = (s8) val;
200 for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) {
201 core_mask = (val == MAX_SPATIAL_EXPANSION) ?
202 wlc->stf->txchain : txcore_default[i];
203 brcms_c_stf_txcore_set(wlc, (u8) i, core_mask);
204 }
205 return 0;
206 }
207
208 /*
209 * Centralized txant update function. call it whenever wlc->stf->txant and/or
210 * wlc->stf->txchain change.
211 *
212 * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to
213 * achieve various tx/rx antenna selection schemes
214 *
215 * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7
216 * means auto(last rx).
217 * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7
218 * means last rx and do tx-antenna selection for SISO transmissions
219 * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7
220 * means last rx and do tx-antenna selection for SISO transmissions
221 * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7
222 * means both cores active
223 */
_brcms_c_stf_phy_txant_upd(struct brcms_c_info * wlc)224 static void _brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc)
225 {
226 s8 txant;
227
228 txant = (s8) wlc->stf->txant;
229 if (BRCMS_PHY_11N_CAP(wlc->band)) {
230 if (txant == ANT_TX_FORCE_0) {
231 wlc->stf->phytxant = PHY_TXC_ANT_0;
232 } else if (txant == ANT_TX_FORCE_1) {
233 wlc->stf->phytxant = PHY_TXC_ANT_1;
234
235 if (BRCMS_ISNPHY(wlc->band) &&
236 NREV_GE(wlc->band->phyrev, 3)
237 && NREV_LT(wlc->band->phyrev, 7))
238 wlc->stf->phytxant = PHY_TXC_ANT_2;
239 } else {
240 if (BRCMS_ISLCNPHY(wlc->band) ||
241 BRCMS_ISSSLPNPHY(wlc->band))
242 wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST;
243 else {
244 /* catch out of sync wlc->stf->txcore */
245 WARN_ON(wlc->stf->txchain <= 0);
246 wlc->stf->phytxant =
247 wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
248 }
249 }
250 } else {
251 if (txant == ANT_TX_FORCE_0)
252 wlc->stf->phytxant = PHY_TXC_OLD_ANT_0;
253 else if (txant == ANT_TX_FORCE_1)
254 wlc->stf->phytxant = PHY_TXC_OLD_ANT_1;
255 else
256 wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST;
257 }
258
259 brcms_b_txant_set(wlc->hw, wlc->stf->phytxant);
260 }
261
brcms_c_stf_txchain_set(struct brcms_c_info * wlc,s32 int_val,bool force)262 int brcms_c_stf_txchain_set(struct brcms_c_info *wlc, s32 int_val, bool force)
263 {
264 u8 txchain = (u8) int_val;
265 u8 txstreams;
266 uint i;
267
268 if (wlc->stf->txchain == txchain)
269 return 0;
270
271 if ((txchain & ~wlc->stf->hw_txchain)
272 || !(txchain & wlc->stf->hw_txchain))
273 return -EINVAL;
274
275 /*
276 * if nrate override is configured to be non-SISO STF mode, reject
277 * reducing txchain to 1
278 */
279 txstreams = (u8) hweight8(txchain);
280 if (txstreams > MAX_STREAMS_SUPPORTED)
281 return -EINVAL;
282
283 wlc->stf->txchain = txchain;
284 wlc->stf->txstreams = txstreams;
285 brcms_c_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx);
286 brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
287 brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
288 wlc->stf->txant =
289 (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF;
290 _brcms_c_stf_phy_txant_upd(wlc);
291
292 wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
293 wlc->stf->rxchain);
294
295 for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++)
296 brcms_c_stf_txcore_set(wlc, (u8) i, txcore_default[i]);
297
298 return 0;
299 }
300
301 /*
302 * update wlc->stf->ss_opmode which represents the operational stf_ss mode
303 * we're using
304 */
brcms_c_stf_ss_update(struct brcms_c_info * wlc,struct brcms_band * band)305 int brcms_c_stf_ss_update(struct brcms_c_info *wlc, struct brcms_band *band)
306 {
307 int ret_code = 0;
308 u8 prev_stf_ss;
309 u8 upd_stf_ss;
310
311 prev_stf_ss = wlc->stf->ss_opmode;
312
313 /*
314 * NOTE: opmode can only be SISO or CDD as STBC is decided on a
315 * per-packet basis
316 */
317 if (BRCMS_STBC_CAP_PHY(wlc) &&
318 wlc->stf->ss_algosel_auto
319 && (wlc->stf->ss_algo_channel != (u16) -1)) {
320 upd_stf_ss = (wlc->stf->txstreams == 1 ||
321 isset(&wlc->stf->ss_algo_channel,
322 PHY_TXC1_MODE_SISO)) ?
323 PHY_TXC1_MODE_SISO : PHY_TXC1_MODE_CDD;
324 } else {
325 if (wlc->band != band)
326 return ret_code;
327 upd_stf_ss = (wlc->stf->txstreams == 1) ?
328 PHY_TXC1_MODE_SISO : band->band_stf_ss_mode;
329 }
330 if (prev_stf_ss != upd_stf_ss) {
331 wlc->stf->ss_opmode = upd_stf_ss;
332 brcms_b_band_stf_ss_set(wlc->hw, upd_stf_ss);
333 }
334
335 return ret_code;
336 }
337
brcms_c_stf_attach(struct brcms_c_info * wlc)338 int brcms_c_stf_attach(struct brcms_c_info *wlc)
339 {
340 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO;
341 wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD;
342
343 if (BRCMS_ISNPHY(wlc->band) &&
344 (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON))
345 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode =
346 PHY_TXC1_MODE_CDD;
347 brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
348 brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
349
350 brcms_c_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO);
351 wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF;
352 wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF;
353
354 if (BRCMS_STBC_CAP_PHY(wlc)) {
355 wlc->stf->ss_algosel_auto = true;
356 /* Init the default value */
357 wlc->stf->ss_algo_channel = (u16) -1;
358 }
359 return 0;
360 }
361
brcms_c_stf_detach(struct brcms_c_info * wlc)362 void brcms_c_stf_detach(struct brcms_c_info *wlc)
363 {
364 }
365
brcms_c_stf_phy_txant_upd(struct brcms_c_info * wlc)366 void brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc)
367 {
368 _brcms_c_stf_phy_txant_upd(wlc);
369 }
370
brcms_c_stf_phy_chain_calc(struct brcms_c_info * wlc)371 void brcms_c_stf_phy_chain_calc(struct brcms_c_info *wlc)
372 {
373 /* get available rx/tx chains */
374 wlc->stf->hw_txchain = (u8) getintvar(wlc->hw->sih, BRCMS_SROM_TXCHAIN);
375 wlc->stf->hw_rxchain = (u8) getintvar(wlc->hw->sih, BRCMS_SROM_RXCHAIN);
376
377 /* these parameter are intended to be used for all PHY types */
378 if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
379 if (BRCMS_ISNPHY(wlc->band))
380 wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
381 else
382 wlc->stf->hw_txchain = TXCHAIN_DEF;
383 }
384
385 wlc->stf->txchain = wlc->stf->hw_txchain;
386 wlc->stf->txstreams = (u8) hweight8(wlc->stf->hw_txchain);
387
388 if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
389 if (BRCMS_ISNPHY(wlc->band))
390 wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
391 else
392 wlc->stf->hw_rxchain = RXCHAIN_DEF;
393 }
394
395 wlc->stf->rxchain = wlc->stf->hw_rxchain;
396 wlc->stf->rxstreams = (u8) hweight8(wlc->stf->hw_rxchain);
397
398 /* initialize the txcore table */
399 memcpy(wlc->stf->txcore, txcore_default, sizeof(wlc->stf->txcore));
400
401 /* default spatial_policy */
402 wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
403 brcms_c_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
404 }
405
_brcms_c_stf_phytxchain_sel(struct brcms_c_info * wlc,u32 rspec)406 static u16 _brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc,
407 u32 rspec)
408 {
409 u16 phytxant = wlc->stf->phytxant;
410
411 if (rspec_stf(rspec) != PHY_TXC1_MODE_SISO)
412 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
413 else if (wlc->stf->txant == ANT_TX_DEF)
414 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
415 phytxant &= PHY_TXC_ANT_MASK;
416 return phytxant;
417 }
418
brcms_c_stf_phytxchain_sel(struct brcms_c_info * wlc,u32 rspec)419 u16 brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc, u32 rspec)
420 {
421 return _brcms_c_stf_phytxchain_sel(wlc, rspec);
422 }
423
brcms_c_stf_d11hdrs_phyctl_txant(struct brcms_c_info * wlc,u32 rspec)424 u16 brcms_c_stf_d11hdrs_phyctl_txant(struct brcms_c_info *wlc, u32 rspec)
425 {
426 u16 phytxant = wlc->stf->phytxant;
427 u16 mask = PHY_TXC_ANT_MASK;
428
429 /* for non-siso rates or default setting, use the available chains */
430 if (BRCMS_ISNPHY(wlc->band)) {
431 phytxant = _brcms_c_stf_phytxchain_sel(wlc, rspec);
432 mask = PHY_TXC_HTANT_MASK;
433 }
434 phytxant |= phytxant & mask;
435 return phytxant;
436 }
437