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 #include "debug.h"
27
28 #define MIN_SPATIAL_EXPANSION 0
29 #define MAX_SPATIAL_EXPANSION 1
30
31 #define BRCMS_STF_SS_STBC_RX(wlc) (BRCMS_ISNPHY(wlc->band) && \
32 NREV_GT(wlc->band->phyrev, 3) && NREV_LE(wlc->band->phyrev, 6))
33
34 #define NSTS_1 1
35 #define NSTS_2 2
36 #define NSTS_3 3
37 #define NSTS_4 4
38
39 static const u8 txcore_default[5] = {
40 (0), /* bitmap of the core enabled */
41 (0x01), /* For Nsts = 1, enable core 1 */
42 (0x03), /* For Nsts = 2, enable core 1 & 2 */
43 (0x07), /* For Nsts = 3, enable core 1, 2 & 3 */
44 (0x0f) /* For Nsts = 4, enable all cores */
45 };
46
brcms_c_stf_stbc_rx_ht_update(struct brcms_c_info * wlc,int val)47 static void brcms_c_stf_stbc_rx_ht_update(struct brcms_c_info *wlc, int val)
48 {
49 /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */
50 if (BRCMS_STF_SS_STBC_RX(wlc)) {
51 if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO))
52 return;
53 }
54
55 if (wlc->pub->up) {
56 brcms_c_update_beacon(wlc);
57 brcms_c_update_probe_resp(wlc, true);
58 }
59 }
60
61 /*
62 * every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to
63 * turn on/off txchain.
64 */
brcms_c_tempsense_upd(struct brcms_c_info * wlc)65 void brcms_c_tempsense_upd(struct brcms_c_info *wlc)
66 {
67 struct brcms_phy_pub *pi = wlc->band->pi;
68 uint active_chains, txchain;
69
70 /* Check if the chip is too hot. Disable one Tx chain, if it is */
71 /* high 4 bits are for Rx chain, low 4 bits are for Tx chain */
72 active_chains = wlc_phy_stf_chain_active_get(pi);
73 txchain = active_chains & 0xf;
74
75 if (wlc->stf->txchain == wlc->stf->hw_txchain) {
76 if (txchain && (txchain < wlc->stf->hw_txchain))
77 /* turn off 1 tx chain */
78 brcms_c_stf_txchain_set(wlc, txchain, true);
79 } else if (wlc->stf->txchain < wlc->stf->hw_txchain) {
80 if (txchain == wlc->stf->hw_txchain)
81 /* turn back on txchain */
82 brcms_c_stf_txchain_set(wlc, txchain, true);
83 }
84 }
85
86 void
brcms_c_stf_ss_algo_channel_get(struct brcms_c_info * wlc,u16 * ss_algo_channel,u16 chanspec)87 brcms_c_stf_ss_algo_channel_get(struct brcms_c_info *wlc, u16 *ss_algo_channel,
88 u16 chanspec)
89 {
90 struct tx_power power = { };
91 u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id;
92
93 /* Clear previous settings */
94 *ss_algo_channel = 0;
95
96 if (!wlc->pub->up) {
97 *ss_algo_channel = (u16) -1;
98 return;
99 }
100
101 wlc_phy_txpower_get_current(wlc->band->pi, &power,
102 CHSPEC_CHANNEL(chanspec));
103
104 siso_mcs_id = (CHSPEC_IS40(chanspec)) ?
105 WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST;
106 cdd_mcs_id = (CHSPEC_IS40(chanspec)) ?
107 WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST;
108 stbc_mcs_id = (CHSPEC_IS40(chanspec)) ?
109 WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST;
110
111 /* criteria to choose stf mode */
112
113 /*
114 * the "+3dbm (12 0.25db units)" is to account for the fact that with
115 * CDD, tx occurs on both chains
116 */
117 if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12))
118 setbit(ss_algo_channel, PHY_TXC1_MODE_SISO);
119 else
120 setbit(ss_algo_channel, PHY_TXC1_MODE_CDD);
121
122 /*
123 * STBC is ORed into to algo channel as STBC requires per-packet SCB
124 * capability check so cannot be default mode of operation. One of
125 * SISO, CDD have to be set
126 */
127 if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12))
128 setbit(ss_algo_channel, PHY_TXC1_MODE_STBC);
129 }
130
brcms_c_stf_stbc_tx_set(struct brcms_c_info * wlc,s32 int_val)131 static bool brcms_c_stf_stbc_tx_set(struct brcms_c_info *wlc, s32 int_val)
132 {
133 if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON))
134 return false;
135
136 if ((int_val == ON) && (wlc->stf->txstreams == 1))
137 return false;
138
139 wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val;
140 wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val;
141
142 return true;
143 }
144
brcms_c_stf_stbc_rx_set(struct brcms_c_info * wlc,s32 int_val)145 bool brcms_c_stf_stbc_rx_set(struct brcms_c_info *wlc, s32 int_val)
146 {
147 if ((int_val != HT_CAP_RX_STBC_NO)
148 && (int_val != HT_CAP_RX_STBC_ONE_STREAM))
149 return false;
150
151 if (BRCMS_STF_SS_STBC_RX(wlc)) {
152 if ((int_val != HT_CAP_RX_STBC_NO)
153 && (wlc->stf->rxstreams == 1))
154 return false;
155 }
156
157 brcms_c_stf_stbc_rx_ht_update(wlc, int_val);
158 return true;
159 }
160
brcms_c_stf_txcore_set(struct brcms_c_info * wlc,u8 Nsts,u8 core_mask)161 static int brcms_c_stf_txcore_set(struct brcms_c_info *wlc, u8 Nsts,
162 u8 core_mask)
163 {
164 brcms_dbg_ht(wlc->hw->d11core, "wl%d: Nsts %d core_mask %x\n",
165 wlc->pub->unit, Nsts, core_mask);
166
167 if (hweight8(core_mask) > wlc->stf->txstreams)
168 core_mask = 0;
169
170 if ((hweight8(core_mask) == wlc->stf->txstreams) &&
171 ((core_mask & ~wlc->stf->txchain)
172 || !(core_mask & wlc->stf->txchain)))
173 core_mask = wlc->stf->txchain;
174
175 wlc->stf->txcore[Nsts] = core_mask;
176 /* Nsts = 1..4, txcore index = 1..4 */
177 if (Nsts == 1) {
178 /* Needs to update beacon and ucode generated response
179 * frames when 1 stream core map changed
180 */
181 wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT;
182 brcms_b_txant_set(wlc->hw, wlc->stf->phytxant);
183 if (wlc->clk) {
184 brcms_c_suspend_mac_and_wait(wlc);
185 brcms_c_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec);
186 brcms_c_enable_mac(wlc);
187 }
188 }
189
190 return 0;
191 }
192
brcms_c_stf_spatial_policy_set(struct brcms_c_info * wlc,int val)193 static int brcms_c_stf_spatial_policy_set(struct brcms_c_info *wlc, int val)
194 {
195 int i;
196 u8 core_mask = 0;
197
198 brcms_dbg_ht(wlc->hw->d11core, "wl%d: val %x\n", wlc->pub->unit,
199 val);
200
201 wlc->stf->spatial_policy = (s8) val;
202 for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) {
203 core_mask = (val == MAX_SPATIAL_EXPANSION) ?
204 wlc->stf->txchain : txcore_default[i];
205 brcms_c_stf_txcore_set(wlc, (u8) i, core_mask);
206 }
207 return 0;
208 }
209
210 /*
211 * Centralized txant update function. call it whenever wlc->stf->txant and/or
212 * wlc->stf->txchain change.
213 *
214 * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to
215 * achieve various tx/rx antenna selection schemes
216 *
217 * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7
218 * means auto(last rx).
219 * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7
220 * means last rx and do tx-antenna selection for SISO transmissions
221 * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7
222 * means last rx and do tx-antenna selection for SISO transmissions
223 * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7
224 * means both cores active
225 */
_brcms_c_stf_phy_txant_upd(struct brcms_c_info * wlc)226 static void _brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc)
227 {
228 s8 txant;
229
230 txant = (s8) wlc->stf->txant;
231 if (BRCMS_PHY_11N_CAP(wlc->band)) {
232 if (txant == ANT_TX_FORCE_0) {
233 wlc->stf->phytxant = PHY_TXC_ANT_0;
234 } else if (txant == ANT_TX_FORCE_1) {
235 wlc->stf->phytxant = PHY_TXC_ANT_1;
236
237 if (BRCMS_ISNPHY(wlc->band) &&
238 NREV_GE(wlc->band->phyrev, 3)
239 && NREV_LT(wlc->band->phyrev, 7))
240 wlc->stf->phytxant = PHY_TXC_ANT_2;
241 } else {
242 if (BRCMS_ISLCNPHY(wlc->band) ||
243 BRCMS_ISSSLPNPHY(wlc->band))
244 wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST;
245 else {
246 /* catch out of sync wlc->stf->txcore */
247 WARN_ON(wlc->stf->txchain <= 0);
248 wlc->stf->phytxant =
249 wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
250 }
251 }
252 } else {
253 if (txant == ANT_TX_FORCE_0)
254 wlc->stf->phytxant = PHY_TXC_OLD_ANT_0;
255 else if (txant == ANT_TX_FORCE_1)
256 wlc->stf->phytxant = PHY_TXC_OLD_ANT_1;
257 else
258 wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST;
259 }
260
261 brcms_b_txant_set(wlc->hw, wlc->stf->phytxant);
262 }
263
brcms_c_stf_txchain_set(struct brcms_c_info * wlc,s32 int_val,bool force)264 int brcms_c_stf_txchain_set(struct brcms_c_info *wlc, s32 int_val, bool force)
265 {
266 u8 txchain = (u8) int_val;
267 u8 txstreams;
268 uint i;
269
270 if (wlc->stf->txchain == txchain)
271 return 0;
272
273 if ((txchain & ~wlc->stf->hw_txchain)
274 || !(txchain & wlc->stf->hw_txchain))
275 return -EINVAL;
276
277 /*
278 * if nrate override is configured to be non-SISO STF mode, reject
279 * reducing txchain to 1
280 */
281 txstreams = (u8) hweight8(txchain);
282 if (txstreams > MAX_STREAMS_SUPPORTED)
283 return -EINVAL;
284
285 wlc->stf->txchain = txchain;
286 wlc->stf->txstreams = txstreams;
287 brcms_c_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx);
288 brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
289 brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
290 wlc->stf->txant =
291 (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF;
292 _brcms_c_stf_phy_txant_upd(wlc);
293
294 wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain,
295 wlc->stf->rxchain);
296
297 for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++)
298 brcms_c_stf_txcore_set(wlc, (u8) i, txcore_default[i]);
299
300 return 0;
301 }
302
303 /*
304 * update wlc->stf->ss_opmode which represents the operational stf_ss mode
305 * we're using
306 */
brcms_c_stf_ss_update(struct brcms_c_info * wlc,struct brcms_band * band)307 void brcms_c_stf_ss_update(struct brcms_c_info *wlc, struct brcms_band *band)
308 {
309 u8 prev_stf_ss;
310 u8 upd_stf_ss;
311
312 prev_stf_ss = wlc->stf->ss_opmode;
313
314 /*
315 * NOTE: opmode can only be SISO or CDD as STBC is decided on a
316 * per-packet basis
317 */
318 if (BRCMS_STBC_CAP_PHY(wlc) &&
319 wlc->stf->ss_algosel_auto
320 && (wlc->stf->ss_algo_channel != (u16) -1)) {
321 upd_stf_ss = (wlc->stf->txstreams == 1 ||
322 isset(&wlc->stf->ss_algo_channel,
323 PHY_TXC1_MODE_SISO)) ?
324 PHY_TXC1_MODE_SISO : PHY_TXC1_MODE_CDD;
325 } else {
326 if (wlc->band != band)
327 return;
328 upd_stf_ss = (wlc->stf->txstreams == 1) ?
329 PHY_TXC1_MODE_SISO : band->band_stf_ss_mode;
330 }
331 if (prev_stf_ss != upd_stf_ss) {
332 wlc->stf->ss_opmode = upd_stf_ss;
333 brcms_b_band_stf_ss_set(wlc->hw, upd_stf_ss);
334 }
335 }
336
brcms_c_stf_attach(struct brcms_c_info * wlc)337 int brcms_c_stf_attach(struct brcms_c_info *wlc)
338 {
339 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO;
340 wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD;
341
342 if (BRCMS_ISNPHY(wlc->band) &&
343 (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON))
344 wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode =
345 PHY_TXC1_MODE_CDD;
346 brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]);
347 brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]);
348
349 brcms_c_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO);
350 wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF;
351 wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF;
352
353 if (BRCMS_STBC_CAP_PHY(wlc)) {
354 wlc->stf->ss_algosel_auto = true;
355 /* Init the default value */
356 wlc->stf->ss_algo_channel = (u16) -1;
357 }
358 return 0;
359 }
360
brcms_c_stf_detach(struct brcms_c_info * wlc)361 void brcms_c_stf_detach(struct brcms_c_info *wlc)
362 {
363 }
364
brcms_c_stf_phy_txant_upd(struct brcms_c_info * wlc)365 void brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc)
366 {
367 _brcms_c_stf_phy_txant_upd(wlc);
368 }
369
brcms_c_stf_phy_chain_calc(struct brcms_c_info * wlc)370 void brcms_c_stf_phy_chain_calc(struct brcms_c_info *wlc)
371 {
372 struct ssb_sprom *sprom = &wlc->hw->d11core->bus->sprom;
373
374 /* get available rx/tx chains */
375 wlc->stf->hw_txchain = sprom->txchain;
376 wlc->stf->hw_rxchain = sprom->rxchain;
377
378 /* these parameter are intended to be used for all PHY types */
379 if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) {
380 if (BRCMS_ISNPHY(wlc->band))
381 wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY;
382 else
383 wlc->stf->hw_txchain = TXCHAIN_DEF;
384 }
385
386 wlc->stf->txchain = wlc->stf->hw_txchain;
387 wlc->stf->txstreams = (u8) hweight8(wlc->stf->hw_txchain);
388
389 if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) {
390 if (BRCMS_ISNPHY(wlc->band))
391 wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY;
392 else
393 wlc->stf->hw_rxchain = RXCHAIN_DEF;
394 }
395
396 wlc->stf->rxchain = wlc->stf->hw_rxchain;
397 wlc->stf->rxstreams = (u8) hweight8(wlc->stf->hw_rxchain);
398
399 /* initialize the txcore table */
400 memcpy(wlc->stf->txcore, txcore_default, sizeof(wlc->stf->txcore));
401
402 /* default spatial_policy */
403 wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION;
404 brcms_c_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION);
405 }
406
_brcms_c_stf_phytxchain_sel(struct brcms_c_info * wlc,u32 rspec)407 static u16 _brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc,
408 u32 rspec)
409 {
410 u16 phytxant = wlc->stf->phytxant;
411
412 if (rspec_stf(rspec) != PHY_TXC1_MODE_SISO)
413 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
414 else if (wlc->stf->txant == ANT_TX_DEF)
415 phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT;
416 phytxant &= PHY_TXC_ANT_MASK;
417 return phytxant;
418 }
419
brcms_c_stf_phytxchain_sel(struct brcms_c_info * wlc,u32 rspec)420 u16 brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc, u32 rspec)
421 {
422 return _brcms_c_stf_phytxchain_sel(wlc, rspec);
423 }
424
brcms_c_stf_d11hdrs_phyctl_txant(struct brcms_c_info * wlc,u32 rspec)425 u16 brcms_c_stf_d11hdrs_phyctl_txant(struct brcms_c_info *wlc, u32 rspec)
426 {
427 u16 phytxant = wlc->stf->phytxant;
428 u16 mask = PHY_TXC_ANT_MASK;
429
430 /* for non-siso rates or default setting, use the available chains */
431 if (BRCMS_ISNPHY(wlc->band)) {
432 phytxant = _brcms_c_stf_phytxchain_sel(wlc, rspec);
433 mask = PHY_TXC_HTANT_MASK;
434 }
435 phytxant |= phytxant & mask;
436 return phytxant;
437 }
438