1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (c) 2013 Broadcom Corporation
4 */
5 #include <linux/slab.h>
6 #include <linux/netdevice.h>
7 #include <net/cfg80211.h>
8
9 #include <brcmu_wifi.h>
10 #include <brcmu_utils.h>
11 #include <defs.h>
12 #include "core.h"
13 #include "debug.h"
14 #include "fwil.h"
15 #include "fwil_types.h"
16 #include "btcoex.h"
17 #include "p2p.h"
18 #include "cfg80211.h"
19
20 /* T1 start SCO/eSCO priority suppression */
21 #define BRCMF_BTCOEX_OPPR_WIN_TIME msecs_to_jiffies(2000)
22
23 /* BT registers values during DHCP */
24 #define BRCMF_BT_DHCP_REG50 0x8022
25 #define BRCMF_BT_DHCP_REG51 0
26 #define BRCMF_BT_DHCP_REG64 0
27 #define BRCMF_BT_DHCP_REG65 0
28 #define BRCMF_BT_DHCP_REG71 0
29 #define BRCMF_BT_DHCP_REG66 0x2710
30 #define BRCMF_BT_DHCP_REG41 0x33
31 #define BRCMF_BT_DHCP_REG68 0x190
32
33 /* number of samples for SCO detection */
34 #define BRCMF_BT_SCO_SAMPLES 12
35
36 /**
37 * enum brcmf_btcoex_state - BT coex DHCP state machine states
38 * @BRCMF_BT_DHCP_IDLE: DCHP is idle
39 * @BRCMF_BT_DHCP_START: DHCP started, wait before
40 * boosting wifi priority
41 * @BRCMF_BT_DHCP_OPPR_WIN: graceful DHCP opportunity ended,
42 * boost wifi priority
43 * @BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT: wifi priority boost end,
44 * restore defaults
45 */
46 enum brcmf_btcoex_state {
47 BRCMF_BT_DHCP_IDLE,
48 BRCMF_BT_DHCP_START,
49 BRCMF_BT_DHCP_OPPR_WIN,
50 BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT
51 };
52
53 /**
54 * struct brcmf_btcoex_info - BT coex related information
55 * @vif: interface for which request was done.
56 * @timer: timer for DHCP state machine
57 * @timeout: configured timeout.
58 * @timer_on: DHCP timer active
59 * @dhcp_done: DHCP finished before T1/T2 timer expiration
60 * @bt_state: DHCP state machine state
61 * @work: DHCP state machine work
62 * @cfg: driver private data for cfg80211 interface
63 * @reg66: saved value of btc_params 66
64 * @reg41: saved value of btc_params 41
65 * @reg68: saved value of btc_params 68
66 * @saved_regs_part1: flag indicating regs 66,41,68
67 * have been saved
68 * @reg50: saved value of btc_params 50
69 * @reg51: saved value of btc_params 51
70 * @reg64: saved value of btc_params 64
71 * @reg65: saved value of btc_params 65
72 * @reg71: saved value of btc_params 71
73 * @saved_regs_part2: flag indicating regs 50,51,64,65,71
74 * have been saved
75 */
76 struct brcmf_btcoex_info {
77 struct brcmf_cfg80211_vif *vif;
78 struct timer_list timer;
79 u16 timeout;
80 bool timer_on;
81 bool dhcp_done;
82 enum brcmf_btcoex_state bt_state;
83 struct work_struct work;
84 struct brcmf_cfg80211_info *cfg;
85 u32 reg66;
86 u32 reg41;
87 u32 reg68;
88 bool saved_regs_part1;
89 u32 reg50;
90 u32 reg51;
91 u32 reg64;
92 u32 reg65;
93 u32 reg71;
94 bool saved_regs_part2;
95 };
96
97 /**
98 * brcmf_btcoex_params_write() - write btc_params firmware variable
99 * @ifp: interface
100 * @addr: btc_params register number
101 * @data: data to write
102 */
brcmf_btcoex_params_write(struct brcmf_if * ifp,u32 addr,u32 data)103 static s32 brcmf_btcoex_params_write(struct brcmf_if *ifp, u32 addr, u32 data)
104 {
105 struct {
106 __le32 addr;
107 __le32 data;
108 } reg_write;
109
110 reg_write.addr = cpu_to_le32(addr);
111 reg_write.data = cpu_to_le32(data);
112 return brcmf_fil_iovar_data_set(ifp, "btc_params",
113 ®_write, sizeof(reg_write));
114 }
115
116 /**
117 * brcmf_btcoex_params_read() - read btc_params firmware variable
118 * @ifp: interface
119 * @addr: btc_params register number
120 * @data: read data
121 */
brcmf_btcoex_params_read(struct brcmf_if * ifp,u32 addr,u32 * data)122 static s32 brcmf_btcoex_params_read(struct brcmf_if *ifp, u32 addr, u32 *data)
123 {
124 *data = addr;
125
126 return brcmf_fil_iovar_int_get(ifp, "btc_params", data);
127 }
128
129 /**
130 * brcmf_btcoex_boost_wifi() - control BT SCO/eSCO parameters
131 * @btci: BT coex info
132 * @trump_sco:
133 * true - set SCO/eSCO parameters for compatibility
134 * during DHCP window
135 * false - restore saved parameter values
136 *
137 * Enhanced BT COEX settings for eSCO compatibility during DHCP window
138 */
brcmf_btcoex_boost_wifi(struct brcmf_btcoex_info * btci,bool trump_sco)139 static void brcmf_btcoex_boost_wifi(struct brcmf_btcoex_info *btci,
140 bool trump_sco)
141 {
142 struct brcmf_if *ifp = brcmf_get_ifp(btci->cfg->pub, 0);
143
144 if (trump_sco && !btci->saved_regs_part2) {
145 /* this should reduce eSCO agressive
146 * retransmit w/o breaking it
147 */
148
149 /* save current */
150 brcmf_dbg(INFO, "new SCO/eSCO coex algo {save & override}\n");
151 brcmf_btcoex_params_read(ifp, 50, &btci->reg50);
152 brcmf_btcoex_params_read(ifp, 51, &btci->reg51);
153 brcmf_btcoex_params_read(ifp, 64, &btci->reg64);
154 brcmf_btcoex_params_read(ifp, 65, &btci->reg65);
155 brcmf_btcoex_params_read(ifp, 71, &btci->reg71);
156
157 btci->saved_regs_part2 = true;
158 brcmf_dbg(INFO,
159 "saved bt_params[50,51,64,65,71]: 0x%x 0x%x 0x%x 0x%x 0x%x\n",
160 btci->reg50, btci->reg51, btci->reg64,
161 btci->reg65, btci->reg71);
162
163 /* pacify the eSco */
164 brcmf_btcoex_params_write(ifp, 50, BRCMF_BT_DHCP_REG50);
165 brcmf_btcoex_params_write(ifp, 51, BRCMF_BT_DHCP_REG51);
166 brcmf_btcoex_params_write(ifp, 64, BRCMF_BT_DHCP_REG64);
167 brcmf_btcoex_params_write(ifp, 65, BRCMF_BT_DHCP_REG65);
168 brcmf_btcoex_params_write(ifp, 71, BRCMF_BT_DHCP_REG71);
169
170 } else if (btci->saved_regs_part2) {
171 /* restore previously saved bt params */
172 brcmf_dbg(INFO, "Do new SCO/eSCO coex algo {restore}\n");
173 brcmf_btcoex_params_write(ifp, 50, btci->reg50);
174 brcmf_btcoex_params_write(ifp, 51, btci->reg51);
175 brcmf_btcoex_params_write(ifp, 64, btci->reg64);
176 brcmf_btcoex_params_write(ifp, 65, btci->reg65);
177 brcmf_btcoex_params_write(ifp, 71, btci->reg71);
178
179 brcmf_dbg(INFO,
180 "restored bt_params[50,51,64,65,71]: 0x%x 0x%x 0x%x 0x%x 0x%x\n",
181 btci->reg50, btci->reg51, btci->reg64,
182 btci->reg65, btci->reg71);
183
184 btci->saved_regs_part2 = false;
185 } else {
186 brcmf_dbg(INFO, "attempted to restore not saved BTCOEX params\n");
187 }
188 }
189
190 /**
191 * brcmf_btcoex_is_sco_active() - check if SCO/eSCO is active
192 * @ifp: interface
193 *
194 * return: true if SCO/eSCO session is active
195 */
brcmf_btcoex_is_sco_active(struct brcmf_if * ifp)196 static bool brcmf_btcoex_is_sco_active(struct brcmf_if *ifp)
197 {
198 int ioc_res = 0;
199 bool res = false;
200 int sco_id_cnt = 0;
201 u32 param27;
202 int i;
203
204 for (i = 0; i < BRCMF_BT_SCO_SAMPLES; i++) {
205 ioc_res = brcmf_btcoex_params_read(ifp, 27, ¶m27);
206
207 if (ioc_res < 0) {
208 brcmf_err("ioc read btc params error\n");
209 break;
210 }
211
212 brcmf_dbg(INFO, "sample[%d], btc_params 27:%x\n", i, param27);
213
214 if ((param27 & 0x6) == 2) { /* count both sco & esco */
215 sco_id_cnt++;
216 }
217
218 if (sco_id_cnt > 2) {
219 brcmf_dbg(INFO,
220 "sco/esco detected, pkt id_cnt:%d samples:%d\n",
221 sco_id_cnt, i);
222 res = true;
223 break;
224 }
225 }
226 brcmf_dbg(TRACE, "exit: result=%d\n", res);
227 return res;
228 }
229
230 /*
231 * btcmf_btcoex_save_part1() - save first step parameters.
232 */
btcmf_btcoex_save_part1(struct brcmf_btcoex_info * btci)233 static void btcmf_btcoex_save_part1(struct brcmf_btcoex_info *btci)
234 {
235 struct brcmf_if *ifp = btci->vif->ifp;
236
237 if (!btci->saved_regs_part1) {
238 /* Retrieve and save original reg value */
239 brcmf_btcoex_params_read(ifp, 66, &btci->reg66);
240 brcmf_btcoex_params_read(ifp, 41, &btci->reg41);
241 brcmf_btcoex_params_read(ifp, 68, &btci->reg68);
242 btci->saved_regs_part1 = true;
243 brcmf_dbg(INFO,
244 "saved btc_params regs (66,41,68) 0x%x 0x%x 0x%x\n",
245 btci->reg66, btci->reg41,
246 btci->reg68);
247 }
248 }
249
250 /*
251 * brcmf_btcoex_restore_part1() - restore first step parameters.
252 */
brcmf_btcoex_restore_part1(struct brcmf_btcoex_info * btci)253 static void brcmf_btcoex_restore_part1(struct brcmf_btcoex_info *btci)
254 {
255 struct brcmf_if *ifp;
256
257 if (btci->saved_regs_part1) {
258 btci->saved_regs_part1 = false;
259 ifp = btci->vif->ifp;
260 brcmf_btcoex_params_write(ifp, 66, btci->reg66);
261 brcmf_btcoex_params_write(ifp, 41, btci->reg41);
262 brcmf_btcoex_params_write(ifp, 68, btci->reg68);
263 brcmf_dbg(INFO,
264 "restored btc_params regs {66,41,68} 0x%x 0x%x 0x%x\n",
265 btci->reg66, btci->reg41,
266 btci->reg68);
267 }
268 }
269
270 /*
271 * brcmf_btcoex_timerfunc() - BT coex timer callback
272 */
brcmf_btcoex_timerfunc(struct timer_list * t)273 static void brcmf_btcoex_timerfunc(struct timer_list *t)
274 {
275 struct brcmf_btcoex_info *bt_local = from_timer(bt_local, t, timer);
276 brcmf_dbg(TRACE, "enter\n");
277
278 bt_local->timer_on = false;
279 schedule_work(&bt_local->work);
280 }
281
282 /**
283 * brcmf_btcoex_handler() - BT coex state machine work handler
284 * @work: work
285 */
brcmf_btcoex_handler(struct work_struct * work)286 static void brcmf_btcoex_handler(struct work_struct *work)
287 {
288 struct brcmf_btcoex_info *btci;
289 btci = container_of(work, struct brcmf_btcoex_info, work);
290 if (btci->timer_on) {
291 btci->timer_on = false;
292 del_timer_sync(&btci->timer);
293 }
294
295 switch (btci->bt_state) {
296 case BRCMF_BT_DHCP_START:
297 /* DHCP started provide OPPORTUNITY window
298 to get DHCP address
299 */
300 brcmf_dbg(INFO, "DHCP started\n");
301 btci->bt_state = BRCMF_BT_DHCP_OPPR_WIN;
302 if (btci->timeout < BRCMF_BTCOEX_OPPR_WIN_TIME) {
303 mod_timer(&btci->timer, btci->timer.expires);
304 } else {
305 btci->timeout -= BRCMF_BTCOEX_OPPR_WIN_TIME;
306 mod_timer(&btci->timer,
307 jiffies + BRCMF_BTCOEX_OPPR_WIN_TIME);
308 }
309 btci->timer_on = true;
310 break;
311
312 case BRCMF_BT_DHCP_OPPR_WIN:
313 if (btci->dhcp_done) {
314 brcmf_dbg(INFO, "DHCP done before T1 expiration\n");
315 goto idle;
316 }
317
318 /* DHCP is not over yet, start lowering BT priority */
319 brcmf_dbg(INFO, "DHCP T1:%d expired\n",
320 jiffies_to_msecs(BRCMF_BTCOEX_OPPR_WIN_TIME));
321 brcmf_btcoex_boost_wifi(btci, true);
322
323 btci->bt_state = BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT;
324 mod_timer(&btci->timer, jiffies + btci->timeout);
325 btci->timer_on = true;
326 break;
327
328 case BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT:
329 if (btci->dhcp_done)
330 brcmf_dbg(INFO, "DHCP done before T2 expiration\n");
331 else
332 brcmf_dbg(INFO, "DHCP T2:%d expired\n",
333 BRCMF_BT_DHCP_FLAG_FORCE_TIMEOUT);
334
335 goto idle;
336
337 default:
338 brcmf_err("invalid state=%d !!!\n", btci->bt_state);
339 goto idle;
340 }
341
342 return;
343
344 idle:
345 btci->bt_state = BRCMF_BT_DHCP_IDLE;
346 btci->timer_on = false;
347 brcmf_btcoex_boost_wifi(btci, false);
348 cfg80211_crit_proto_stopped(&btci->vif->wdev, GFP_KERNEL);
349 brcmf_btcoex_restore_part1(btci);
350 btci->vif = NULL;
351 }
352
353 /**
354 * brcmf_btcoex_attach() - initialize BT coex data
355 * @cfg: driver private cfg80211 data
356 *
357 * return: 0 on success
358 */
brcmf_btcoex_attach(struct brcmf_cfg80211_info * cfg)359 int brcmf_btcoex_attach(struct brcmf_cfg80211_info *cfg)
360 {
361 struct brcmf_btcoex_info *btci = NULL;
362 brcmf_dbg(TRACE, "enter\n");
363
364 btci = kmalloc(sizeof(struct brcmf_btcoex_info), GFP_KERNEL);
365 if (!btci)
366 return -ENOMEM;
367
368 btci->bt_state = BRCMF_BT_DHCP_IDLE;
369
370 /* Set up timer for BT */
371 btci->timer_on = false;
372 btci->timeout = BRCMF_BTCOEX_OPPR_WIN_TIME;
373 timer_setup(&btci->timer, brcmf_btcoex_timerfunc, 0);
374 btci->cfg = cfg;
375 btci->saved_regs_part1 = false;
376 btci->saved_regs_part2 = false;
377
378 INIT_WORK(&btci->work, brcmf_btcoex_handler);
379
380 cfg->btcoex = btci;
381 return 0;
382 }
383
384 /**
385 * brcmf_btcoex_detach - clean BT coex data
386 * @cfg: driver private cfg80211 data
387 */
brcmf_btcoex_detach(struct brcmf_cfg80211_info * cfg)388 void brcmf_btcoex_detach(struct brcmf_cfg80211_info *cfg)
389 {
390 brcmf_dbg(TRACE, "enter\n");
391
392 if (!cfg->btcoex)
393 return;
394
395 if (cfg->btcoex->timer_on) {
396 cfg->btcoex->timer_on = false;
397 timer_shutdown_sync(&cfg->btcoex->timer);
398 }
399
400 cancel_work_sync(&cfg->btcoex->work);
401
402 brcmf_btcoex_boost_wifi(cfg->btcoex, false);
403 brcmf_btcoex_restore_part1(cfg->btcoex);
404
405 kfree(cfg->btcoex);
406 cfg->btcoex = NULL;
407 }
408
brcmf_btcoex_dhcp_start(struct brcmf_btcoex_info * btci)409 static void brcmf_btcoex_dhcp_start(struct brcmf_btcoex_info *btci)
410 {
411 struct brcmf_if *ifp = btci->vif->ifp;
412
413 btcmf_btcoex_save_part1(btci);
414 /* set new regs values */
415 brcmf_btcoex_params_write(ifp, 66, BRCMF_BT_DHCP_REG66);
416 brcmf_btcoex_params_write(ifp, 41, BRCMF_BT_DHCP_REG41);
417 brcmf_btcoex_params_write(ifp, 68, BRCMF_BT_DHCP_REG68);
418 btci->dhcp_done = false;
419 btci->bt_state = BRCMF_BT_DHCP_START;
420 schedule_work(&btci->work);
421 brcmf_dbg(TRACE, "enable BT DHCP Timer\n");
422 }
423
brcmf_btcoex_dhcp_end(struct brcmf_btcoex_info * btci)424 static void brcmf_btcoex_dhcp_end(struct brcmf_btcoex_info *btci)
425 {
426 /* Stop any bt timer because DHCP session is done */
427 btci->dhcp_done = true;
428 if (btci->timer_on) {
429 brcmf_dbg(INFO, "disable BT DHCP Timer\n");
430 btci->timer_on = false;
431 del_timer_sync(&btci->timer);
432
433 /* schedule worker if transition to IDLE is needed */
434 if (btci->bt_state != BRCMF_BT_DHCP_IDLE) {
435 brcmf_dbg(INFO, "bt_state:%d\n",
436 btci->bt_state);
437 schedule_work(&btci->work);
438 }
439 } else {
440 /* Restore original values */
441 brcmf_btcoex_restore_part1(btci);
442 }
443 }
444
445 /*
446 * brcmf_btcoex_set_mode - set BT coex mode
447 * @mode: Wifi-Bluetooth coexistence mode
448 *
449 * return: 0 on success
450 */
brcmf_btcoex_set_mode(struct brcmf_cfg80211_vif * vif,enum brcmf_btcoex_mode mode,u16 duration)451 int brcmf_btcoex_set_mode(struct brcmf_cfg80211_vif *vif,
452 enum brcmf_btcoex_mode mode, u16 duration)
453 {
454 struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(vif->wdev.wiphy);
455 struct brcmf_btcoex_info *btci = cfg->btcoex;
456 struct brcmf_if *ifp = brcmf_get_ifp(cfg->pub, 0);
457
458 switch (mode) {
459 case BRCMF_BTCOEX_DISABLED:
460 brcmf_dbg(INFO, "DHCP session starts\n");
461 if (btci->bt_state != BRCMF_BT_DHCP_IDLE)
462 return -EBUSY;
463 /* Start BT timer only for SCO connection */
464 if (brcmf_btcoex_is_sco_active(ifp)) {
465 btci->timeout = msecs_to_jiffies(duration);
466 btci->vif = vif;
467 brcmf_btcoex_dhcp_start(btci);
468 }
469 break;
470
471 case BRCMF_BTCOEX_ENABLED:
472 brcmf_dbg(INFO, "DHCP session ends\n");
473 if (btci->bt_state != BRCMF_BT_DHCP_IDLE &&
474 vif == btci->vif) {
475 brcmf_btcoex_dhcp_end(btci);
476 }
477 break;
478 default:
479 brcmf_dbg(INFO, "Unknown mode, ignored\n");
480 }
481 return 0;
482 }
483