ar9285_diversity.c revision 221694
1/* 2 * Copyright (c) 2008-2010 Atheros Communications Inc. 3 * Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/dev/ath/ath_hal/ar9002/ar9285_diversity.c 221694 2011-05-09 15:19:49Z adrian $ 27 */ 28#include "opt_ah.h" 29 30#include "ah.h" 31#include "ah_desc.h" 32#include "ah_internal.h" 33#include "ah_eeprom_v4k.h" 34 35#include "ar9002/ar9280.h" 36#include "ar9002/ar9285_diversity.h" 37#include "ar9002/ar9285.h" 38#include "ar5416/ar5416reg.h" 39#include "ar5416/ar5416phy.h" 40#include "ar9002/ar9285phy.h" 41#include "ar9002/ar9285_phy.h" 42 43 44/* Linux compability macros */ 45/* 46 * XXX these don't handle rounding, underflow, overflow, wrapping! 47 */ 48#define msecs_to_jiffies(a) ( (a) * hz / 1000 ) 49#define time_after(a, b) ( (long) (b) - (long) (a) < 0 ) 50 51static HAL_BOOL 52ath_is_alt_ant_ratio_better(int alt_ratio, int maxdelta, int mindelta, 53 int main_rssi_avg, int alt_rssi_avg, int pkt_count) 54{ 55 return (((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) && 56 (alt_rssi_avg > main_rssi_avg + maxdelta)) || 57 (alt_rssi_avg > main_rssi_avg + mindelta)) && (pkt_count > 50); 58} 59 60static void 61ath_lnaconf_alt_good_scan(struct ar9285_ant_comb *antcomb, 62 struct ar9285_antcomb_conf ant_conf, int main_rssi_avg) 63{ 64 antcomb->quick_scan_cnt = 0; 65 66 if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA2) 67 antcomb->rssi_lna2 = main_rssi_avg; 68 else if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA1) 69 antcomb->rssi_lna1 = main_rssi_avg; 70 71 switch ((ant_conf.main_lna_conf << 4) | ant_conf.alt_lna_conf) { 72 case (0x10): /* LNA2 A-B */ 73 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 74 antcomb->first_quick_scan_conf = 75 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 76 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1; 77 break; 78 case (0x20): /* LNA1 A-B */ 79 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 80 antcomb->first_quick_scan_conf = 81 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 82 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2; 83 break; 84 case (0x21): /* LNA1 LNA2 */ 85 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA2; 86 antcomb->first_quick_scan_conf = 87 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 88 antcomb->second_quick_scan_conf = 89 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 90 break; 91 case (0x12): /* LNA2 LNA1 */ 92 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1; 93 antcomb->first_quick_scan_conf = 94 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 95 antcomb->second_quick_scan_conf = 96 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 97 break; 98 case (0x13): /* LNA2 A+B */ 99 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 100 antcomb->first_quick_scan_conf = 101 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 102 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1; 103 break; 104 case (0x23): /* LNA1 A+B */ 105 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 106 antcomb->first_quick_scan_conf = 107 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 108 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2; 109 break; 110 default: 111 break; 112 } 113} 114 115static void 116ath_select_ant_div_from_quick_scan(struct ar9285_ant_comb *antcomb, 117 struct ar9285_antcomb_conf *div_ant_conf, int main_rssi_avg, 118 int alt_rssi_avg, int alt_ratio) 119{ 120 /* alt_good */ 121 switch (antcomb->quick_scan_cnt) { 122 case 0: 123 /* set alt to main, and alt to first conf */ 124 div_ant_conf->main_lna_conf = antcomb->main_conf; 125 div_ant_conf->alt_lna_conf = antcomb->first_quick_scan_conf; 126 break; 127 case 1: 128 /* set alt to main, and alt to first conf */ 129 div_ant_conf->main_lna_conf = antcomb->main_conf; 130 div_ant_conf->alt_lna_conf = antcomb->second_quick_scan_conf; 131 antcomb->rssi_first = main_rssi_avg; 132 antcomb->rssi_second = alt_rssi_avg; 133 134 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) { 135 /* main is LNA1 */ 136 if (ath_is_alt_ant_ratio_better(alt_ratio, 137 ATH_ANT_DIV_COMB_LNA1_DELTA_HI, 138 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, 139 main_rssi_avg, alt_rssi_avg, 140 antcomb->total_pkt_count)) 141 antcomb->first_ratio = AH_TRUE; 142 else 143 antcomb->first_ratio = AH_FALSE; 144 } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) { 145 if (ath_is_alt_ant_ratio_better(alt_ratio, 146 ATH_ANT_DIV_COMB_LNA1_DELTA_MID, 147 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, 148 main_rssi_avg, alt_rssi_avg, 149 antcomb->total_pkt_count)) 150 antcomb->first_ratio = AH_TRUE; 151 else 152 antcomb->first_ratio = AH_FALSE; 153 } else { 154 if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) && 155 (alt_rssi_avg > main_rssi_avg + 156 ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) || 157 (alt_rssi_avg > main_rssi_avg)) && 158 (antcomb->total_pkt_count > 50)) 159 antcomb->first_ratio = AH_TRUE; 160 else 161 antcomb->first_ratio = AH_FALSE; 162 } 163 break; 164 case 2: 165 antcomb->alt_good = AH_FALSE; 166 antcomb->scan_not_start = AH_FALSE; 167 antcomb->scan = AH_FALSE; 168 antcomb->rssi_first = main_rssi_avg; 169 antcomb->rssi_third = alt_rssi_avg; 170 171 if (antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1) 172 antcomb->rssi_lna1 = alt_rssi_avg; 173 else if (antcomb->second_quick_scan_conf == 174 ATH_ANT_DIV_COMB_LNA2) 175 antcomb->rssi_lna2 = alt_rssi_avg; 176 else if (antcomb->second_quick_scan_conf == 177 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2) { 178 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) 179 antcomb->rssi_lna2 = main_rssi_avg; 180 else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) 181 antcomb->rssi_lna1 = main_rssi_avg; 182 } 183 184 if (antcomb->rssi_lna2 > antcomb->rssi_lna1 + 185 ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA) 186 div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2; 187 else 188 div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1; 189 190 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) { 191 if (ath_is_alt_ant_ratio_better(alt_ratio, 192 ATH_ANT_DIV_COMB_LNA1_DELTA_HI, 193 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, 194 main_rssi_avg, alt_rssi_avg, 195 antcomb->total_pkt_count)) 196 antcomb->second_ratio = AH_TRUE; 197 else 198 antcomb->second_ratio = AH_FALSE; 199 } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) { 200 if (ath_is_alt_ant_ratio_better(alt_ratio, 201 ATH_ANT_DIV_COMB_LNA1_DELTA_MID, 202 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, 203 main_rssi_avg, alt_rssi_avg, 204 antcomb->total_pkt_count)) 205 antcomb->second_ratio = AH_TRUE; 206 else 207 antcomb->second_ratio = AH_FALSE; 208 } else { 209 if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) && 210 (alt_rssi_avg > main_rssi_avg + 211 ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) || 212 (alt_rssi_avg > main_rssi_avg)) && 213 (antcomb->total_pkt_count > 50)) 214 antcomb->second_ratio = AH_TRUE; 215 else 216 antcomb->second_ratio = AH_FALSE; 217 } 218 219 /* set alt to the conf with maximun ratio */ 220 if (antcomb->first_ratio && antcomb->second_ratio) { 221 if (antcomb->rssi_second > antcomb->rssi_third) { 222 /* first alt*/ 223 if ((antcomb->first_quick_scan_conf == 224 ATH_ANT_DIV_COMB_LNA1) || 225 (antcomb->first_quick_scan_conf == 226 ATH_ANT_DIV_COMB_LNA2)) 227 /* Set alt LNA1 or LNA2*/ 228 if (div_ant_conf->main_lna_conf == 229 ATH_ANT_DIV_COMB_LNA2) 230 div_ant_conf->alt_lna_conf = 231 ATH_ANT_DIV_COMB_LNA1; 232 else 233 div_ant_conf->alt_lna_conf = 234 ATH_ANT_DIV_COMB_LNA2; 235 else 236 /* Set alt to A+B or A-B */ 237 div_ant_conf->alt_lna_conf = 238 antcomb->first_quick_scan_conf; 239 } else if ((antcomb->second_quick_scan_conf == 240 ATH_ANT_DIV_COMB_LNA1) || 241 (antcomb->second_quick_scan_conf == 242 ATH_ANT_DIV_COMB_LNA2)) { 243 /* Set alt LNA1 or LNA2 */ 244 if (div_ant_conf->main_lna_conf == 245 ATH_ANT_DIV_COMB_LNA2) 246 div_ant_conf->alt_lna_conf = 247 ATH_ANT_DIV_COMB_LNA1; 248 else 249 div_ant_conf->alt_lna_conf = 250 ATH_ANT_DIV_COMB_LNA2; 251 } else { 252 /* Set alt to A+B or A-B */ 253 div_ant_conf->alt_lna_conf = 254 antcomb->second_quick_scan_conf; 255 } 256 } else if (antcomb->first_ratio) { 257 /* first alt */ 258 if ((antcomb->first_quick_scan_conf == 259 ATH_ANT_DIV_COMB_LNA1) || 260 (antcomb->first_quick_scan_conf == 261 ATH_ANT_DIV_COMB_LNA2)) 262 /* Set alt LNA1 or LNA2 */ 263 if (div_ant_conf->main_lna_conf == 264 ATH_ANT_DIV_COMB_LNA2) 265 div_ant_conf->alt_lna_conf = 266 ATH_ANT_DIV_COMB_LNA1; 267 else 268 div_ant_conf->alt_lna_conf = 269 ATH_ANT_DIV_COMB_LNA2; 270 else 271 /* Set alt to A+B or A-B */ 272 div_ant_conf->alt_lna_conf = 273 antcomb->first_quick_scan_conf; 274 } else if (antcomb->second_ratio) { 275 /* second alt */ 276 if ((antcomb->second_quick_scan_conf == 277 ATH_ANT_DIV_COMB_LNA1) || 278 (antcomb->second_quick_scan_conf == 279 ATH_ANT_DIV_COMB_LNA2)) 280 /* Set alt LNA1 or LNA2 */ 281 if (div_ant_conf->main_lna_conf == 282 ATH_ANT_DIV_COMB_LNA2) 283 div_ant_conf->alt_lna_conf = 284 ATH_ANT_DIV_COMB_LNA1; 285 else 286 div_ant_conf->alt_lna_conf = 287 ATH_ANT_DIV_COMB_LNA2; 288 else 289 /* Set alt to A+B or A-B */ 290 div_ant_conf->alt_lna_conf = 291 antcomb->second_quick_scan_conf; 292 } else { 293 /* main is largest */ 294 if ((antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) || 295 (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2)) 296 /* Set alt LNA1 or LNA2 */ 297 if (div_ant_conf->main_lna_conf == 298 ATH_ANT_DIV_COMB_LNA2) 299 div_ant_conf->alt_lna_conf = 300 ATH_ANT_DIV_COMB_LNA1; 301 else 302 div_ant_conf->alt_lna_conf = 303 ATH_ANT_DIV_COMB_LNA2; 304 else 305 /* Set alt to A+B or A-B */ 306 div_ant_conf->alt_lna_conf = antcomb->main_conf; 307 } 308 break; 309 default: 310 break; 311 } 312} 313 314static void 315ath_ant_div_conf_fast_divbias(struct ar9285_antcomb_conf *ant_conf) 316{ 317 /* Adjust the fast_div_bias based on main and alt lna conf */ 318 switch ((ant_conf->main_lna_conf << 4) | ant_conf->alt_lna_conf) { 319 case (0x01): /* A-B LNA2 */ 320 ant_conf->fast_div_bias = 0x3b; 321 break; 322 case (0x02): /* A-B LNA1 */ 323 ant_conf->fast_div_bias = 0x3d; 324 break; 325 case (0x03): /* A-B A+B */ 326 ant_conf->fast_div_bias = 0x1; 327 break; 328 case (0x10): /* LNA2 A-B */ 329 ant_conf->fast_div_bias = 0x7; 330 break; 331 case (0x12): /* LNA2 LNA1 */ 332 ant_conf->fast_div_bias = 0x2; 333 break; 334 case (0x13): /* LNA2 A+B */ 335 ant_conf->fast_div_bias = 0x7; 336 break; 337 case (0x20): /* LNA1 A-B */ 338 ant_conf->fast_div_bias = 0x6; 339 break; 340 case (0x21): /* LNA1 LNA2 */ 341 ant_conf->fast_div_bias = 0x0; 342 break; 343 case (0x23): /* LNA1 A+B */ 344 ant_conf->fast_div_bias = 0x6; 345 break; 346 case (0x30): /* A+B A-B */ 347 ant_conf->fast_div_bias = 0x1; 348 break; 349 case (0x31): /* A+B LNA2 */ 350 ant_conf->fast_div_bias = 0x3b; 351 break; 352 case (0x32): /* A+B LNA1 */ 353 ant_conf->fast_div_bias = 0x3d; 354 break; 355 default: 356 break; 357 } 358} 359 360/* Antenna diversity and combining */ 361void 362ar9285_ant_comb_scan(struct ath_hal *ah, struct ath_rx_status *rs, 363 unsigned long ticks, int hz) 364{ 365 struct ar9285_antcomb_conf div_ant_conf; 366 struct ar9285_ant_comb *antcomb = &AH9285(ah)->ant_comb; 367 int alt_ratio = 0, alt_rssi_avg = 0, main_rssi_avg = 0, curr_alt_set; 368 int curr_main_set, curr_bias; 369 int main_rssi = rs->rs_rssi_ctl[0]; 370 int alt_rssi = rs->rs_rssi_ctl[1]; 371 int rx_ant_conf, main_ant_conf; 372 HAL_BOOL short_scan = AH_FALSE; 373 374 if (! ar9285_check_div_comb(ah)) 375 return; 376 377 if (AH5212(ah)->ah_diversity == AH_FALSE) 378 return; 379 380 rx_ant_conf = (rs->rs_rssi_ctl[2] >> ATH_ANT_RX_CURRENT_SHIFT) & 381 ATH_ANT_RX_MASK; 382 main_ant_conf = (rs->rs_rssi_ctl[2] >> ATH_ANT_RX_MAIN_SHIFT) & 383 ATH_ANT_RX_MASK; 384 385#if 0 386 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main: %d, alt: %d, rx_ant_conf: %x, main_ant_conf: %x\n", 387 __func__, main_rssi, alt_rssi, rx_ant_conf, main_ant_conf); 388#endif 389 390 /* Record packet only when alt_rssi is positive */ 391 if (alt_rssi > 0) { 392 antcomb->total_pkt_count++; 393 antcomb->main_total_rssi += main_rssi; 394 antcomb->alt_total_rssi += alt_rssi; 395 if (main_ant_conf == rx_ant_conf) 396 antcomb->main_recv_cnt++; 397 else 398 antcomb->alt_recv_cnt++; 399 } 400 401 /* Short scan check */ 402 if (antcomb->scan && antcomb->alt_good) { 403 if (time_after(ticks, antcomb->scan_start_time + 404 msecs_to_jiffies(ATH_ANT_DIV_COMB_SHORT_SCAN_INTR))) 405 short_scan = AH_TRUE; 406 else 407 if (antcomb->total_pkt_count == 408 ATH_ANT_DIV_COMB_SHORT_SCAN_PKTCOUNT) { 409 alt_ratio = ((antcomb->alt_recv_cnt * 100) / 410 antcomb->total_pkt_count); 411 if (alt_ratio < ATH_ANT_DIV_COMB_ALT_ANT_RATIO) 412 short_scan = AH_TRUE; 413 } 414 } 415 416 if (((antcomb->total_pkt_count < ATH_ANT_DIV_COMB_MAX_PKTCOUNT) || 417 rs->rs_moreaggr) && !short_scan) 418 return; 419 420 if (antcomb->total_pkt_count) { 421 alt_ratio = ((antcomb->alt_recv_cnt * 100) / 422 antcomb->total_pkt_count); 423 main_rssi_avg = (antcomb->main_total_rssi / 424 antcomb->total_pkt_count); 425 alt_rssi_avg = (antcomb->alt_total_rssi / 426 antcomb->total_pkt_count); 427 } 428 429 ar9285_antdiv_comb_conf_get(ah, &div_ant_conf); 430 curr_alt_set = div_ant_conf.alt_lna_conf; 431 curr_main_set = div_ant_conf.main_lna_conf; 432 curr_bias = div_ant_conf.fast_div_bias; 433 434 antcomb->count++; 435 436 if (antcomb->count == ATH_ANT_DIV_COMB_MAX_COUNT) { 437 if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) { 438 ath_lnaconf_alt_good_scan(antcomb, div_ant_conf, 439 main_rssi_avg); 440 antcomb->alt_good = AH_TRUE; 441 } else { 442 antcomb->alt_good = AH_FALSE; 443 } 444 445 antcomb->count = 0; 446 antcomb->scan = AH_TRUE; 447 antcomb->scan_not_start = AH_TRUE; 448 } 449 450 if (!antcomb->scan) { 451 if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) { 452 if (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) { 453 /* Switch main and alt LNA */ 454 div_ant_conf.main_lna_conf = 455 ATH_ANT_DIV_COMB_LNA2; 456 div_ant_conf.alt_lna_conf = 457 ATH_ANT_DIV_COMB_LNA1; 458 } else if (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) { 459 div_ant_conf.main_lna_conf = 460 ATH_ANT_DIV_COMB_LNA1; 461 div_ant_conf.alt_lna_conf = 462 ATH_ANT_DIV_COMB_LNA2; 463 } 464 465 goto div_comb_done; 466 } else if ((curr_alt_set != ATH_ANT_DIV_COMB_LNA1) && 467 (curr_alt_set != ATH_ANT_DIV_COMB_LNA2)) { 468 /* Set alt to another LNA */ 469 if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) 470 div_ant_conf.alt_lna_conf = 471 ATH_ANT_DIV_COMB_LNA1; 472 else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) 473 div_ant_conf.alt_lna_conf = 474 ATH_ANT_DIV_COMB_LNA2; 475 476 goto div_comb_done; 477 } 478 479 if ((alt_rssi_avg < (main_rssi_avg + 480 ATH_ANT_DIV_COMB_LNA1_LNA2_DELTA))) 481 goto div_comb_done; 482 } 483 484 if (!antcomb->scan_not_start) { 485 switch (curr_alt_set) { 486 case ATH_ANT_DIV_COMB_LNA2: 487 antcomb->rssi_lna2 = alt_rssi_avg; 488 antcomb->rssi_lna1 = main_rssi_avg; 489 antcomb->scan = AH_TRUE; 490 /* set to A+B */ 491 div_ant_conf.main_lna_conf = 492 ATH_ANT_DIV_COMB_LNA1; 493 div_ant_conf.alt_lna_conf = 494 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 495 break; 496 case ATH_ANT_DIV_COMB_LNA1: 497 antcomb->rssi_lna1 = alt_rssi_avg; 498 antcomb->rssi_lna2 = main_rssi_avg; 499 antcomb->scan = AH_TRUE; 500 /* set to A+B */ 501 div_ant_conf.main_lna_conf = ATH_ANT_DIV_COMB_LNA2; 502 div_ant_conf.alt_lna_conf = 503 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 504 break; 505 case ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2: 506 antcomb->rssi_add = alt_rssi_avg; 507 antcomb->scan = AH_TRUE; 508 /* set to A-B */ 509 div_ant_conf.alt_lna_conf = 510 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 511 break; 512 case ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2: 513 antcomb->rssi_sub = alt_rssi_avg; 514 antcomb->scan = AH_FALSE; 515 if (antcomb->rssi_lna2 > 516 (antcomb->rssi_lna1 + 517 ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)) { 518 /* use LNA2 as main LNA */ 519 if ((antcomb->rssi_add > antcomb->rssi_lna1) && 520 (antcomb->rssi_add > antcomb->rssi_sub)) { 521 /* set to A+B */ 522 div_ant_conf.main_lna_conf = 523 ATH_ANT_DIV_COMB_LNA2; 524 div_ant_conf.alt_lna_conf = 525 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 526 } else if (antcomb->rssi_sub > 527 antcomb->rssi_lna1) { 528 /* set to A-B */ 529 div_ant_conf.main_lna_conf = 530 ATH_ANT_DIV_COMB_LNA2; 531 div_ant_conf.alt_lna_conf = 532 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 533 } else { 534 /* set to LNA1 */ 535 div_ant_conf.main_lna_conf = 536 ATH_ANT_DIV_COMB_LNA2; 537 div_ant_conf.alt_lna_conf = 538 ATH_ANT_DIV_COMB_LNA1; 539 } 540 } else { 541 /* use LNA1 as main LNA */ 542 if ((antcomb->rssi_add > antcomb->rssi_lna2) && 543 (antcomb->rssi_add > antcomb->rssi_sub)) { 544 /* set to A+B */ 545 div_ant_conf.main_lna_conf = 546 ATH_ANT_DIV_COMB_LNA1; 547 div_ant_conf.alt_lna_conf = 548 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 549 } else if (antcomb->rssi_sub > 550 antcomb->rssi_lna1) { 551 /* set to A-B */ 552 div_ant_conf.main_lna_conf = 553 ATH_ANT_DIV_COMB_LNA1; 554 div_ant_conf.alt_lna_conf = 555 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 556 } else { 557 /* set to LNA2 */ 558 div_ant_conf.main_lna_conf = 559 ATH_ANT_DIV_COMB_LNA1; 560 div_ant_conf.alt_lna_conf = 561 ATH_ANT_DIV_COMB_LNA2; 562 } 563 } 564 break; 565 default: 566 break; 567 } 568 } else { 569 if (!antcomb->alt_good) { 570 antcomb->scan_not_start = AH_FALSE; 571 /* Set alt to another LNA */ 572 if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) { 573 div_ant_conf.main_lna_conf = 574 ATH_ANT_DIV_COMB_LNA2; 575 div_ant_conf.alt_lna_conf = 576 ATH_ANT_DIV_COMB_LNA1; 577 } else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) { 578 div_ant_conf.main_lna_conf = 579 ATH_ANT_DIV_COMB_LNA1; 580 div_ant_conf.alt_lna_conf = 581 ATH_ANT_DIV_COMB_LNA2; 582 } 583 goto div_comb_done; 584 } 585 } 586 587 ath_select_ant_div_from_quick_scan(antcomb, &div_ant_conf, 588 main_rssi_avg, alt_rssi_avg, 589 alt_ratio); 590 591 antcomb->quick_scan_cnt++; 592 593div_comb_done: 594 ath_ant_div_conf_fast_divbias(&div_ant_conf); 595 596 ar9285_antdiv_comb_conf_set(ah, &div_ant_conf); 597 598 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: total_pkt_count=%d\n", 599 __func__, antcomb->total_pkt_count); 600 601 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main_total_rssi=%d\n", 602 __func__, antcomb->main_total_rssi); 603 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: alt_total_rssi=%d\n", 604 __func__, antcomb->alt_total_rssi); 605 606 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main_rssi_avg=%d\n", 607 __func__, main_rssi_avg); 608 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: alt_alt_rssi_avg=%d\n", 609 __func__, alt_rssi_avg); 610 611 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main_recv_cnt=%d\n", 612 __func__, antcomb->main_recv_cnt); 613 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: alt_recv_cnt=%d\n", 614 __func__, antcomb->alt_recv_cnt); 615 616 if (curr_alt_set != div_ant_conf.alt_lna_conf) 617 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: lna_conf: %x -> %x\n", 618 __func__, curr_alt_set, div_ant_conf.alt_lna_conf); 619 if (curr_main_set != div_ant_conf.main_lna_conf) 620 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: main_lna_conf: %x -> %x\n", 621 __func__, curr_main_set, div_ant_conf.main_lna_conf); 622 if (curr_bias != div_ant_conf.fast_div_bias) 623 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: fast_div_bias: %x -> %x\n", 624 __func__, curr_bias, div_ant_conf.fast_div_bias); 625 626 antcomb->scan_start_time = ticks; 627 antcomb->total_pkt_count = 0; 628 antcomb->main_total_rssi = 0; 629 antcomb->alt_total_rssi = 0; 630 antcomb->main_recv_cnt = 0; 631 antcomb->alt_recv_cnt = 0; 632} 633 634/* 635 * Set the antenna switch to control RX antenna diversity. 636 * 637 * If a fixed configuration is used, the LNA and div bias 638 * settings are fixed and the antenna diversity scanning routine 639 * is disabled. 640 * 641 * If a variable configuration is used, a default is programmed 642 * in and sampling commences per RXed packet. 643 * 644 * Since this is called from ar9285SetBoardValues() to setup 645 * diversity, it means that after a reset or scan, any current 646 * software diversity combining settings will be lost and won't 647 * re-appear until after the first successful sample run. 648 * Please keep this in mind if you're seeing weird performance 649 * that happens to relate to scan/diversity timing. 650 */ 651HAL_BOOL 652ar9285SetAntennaSwitch(struct ath_hal *ah, HAL_ANT_SETTING settings) 653{ 654 int regVal; 655 const HAL_EEPROM_v4k *ee = AH_PRIVATE(ah)->ah_eeprom; 656 const MODAL_EEP4K_HEADER *pModal = &ee->ee_base.modalHeader; 657 uint8_t ant_div_control1, ant_div_control2; 658 659 if (pModal->version < 3) { 660 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: not supported\n", 661 __func__); 662 return AH_FALSE; /* Can't do diversity */ 663 } 664 665 /* Store settings */ 666 AH5212(ah)->ah_antControl = settings; 667 AH5212(ah)->ah_diversity = (settings == HAL_ANT_VARIABLE); 668 669 /* XXX don't fiddle if the PHY is in sleep mode or ! chan */ 670 671 /* Begin setting the relevant registers */ 672 673 ant_div_control1 = pModal->antdiv_ctl1; 674 ant_div_control2 = pModal->antdiv_ctl2; 675 676 regVal = OS_REG_READ(ah, AR_PHY_MULTICHAIN_GAIN_CTL); 677 regVal &= (~(AR_PHY_9285_ANT_DIV_CTL_ALL)); 678 679 /* enable antenna diversity only if diversityControl == HAL_ANT_VARIABLE */ 680 if (settings == HAL_ANT_VARIABLE) 681 regVal |= SM(ant_div_control1, AR_PHY_9285_ANT_DIV_CTL); 682 683 if (settings == HAL_ANT_VARIABLE) { 684 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: HAL_ANT_VARIABLE\n", 685 __func__); 686 regVal |= SM(ant_div_control2, AR_PHY_9285_ANT_DIV_ALT_LNACONF); 687 regVal |= SM((ant_div_control2 >> 2), AR_PHY_9285_ANT_DIV_MAIN_LNACONF); 688 regVal |= SM((ant_div_control1 >> 1), AR_PHY_9285_ANT_DIV_ALT_GAINTB); 689 regVal |= SM((ant_div_control1 >> 2), AR_PHY_9285_ANT_DIV_MAIN_GAINTB); 690 } else { 691 if (settings == HAL_ANT_FIXED_A) { 692 /* Diversity disabled, RX = LNA1 */ 693 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: HAL_ANT_FIXED_A\n", 694 __func__); 695 regVal |= SM(ATH_ANT_DIV_COMB_LNA2, AR_PHY_9285_ANT_DIV_ALT_LNACONF); 696 regVal |= SM(ATH_ANT_DIV_COMB_LNA1, AR_PHY_9285_ANT_DIV_MAIN_LNACONF); 697 regVal |= SM(AR_PHY_9285_ANT_DIV_GAINTB_0, AR_PHY_9285_ANT_DIV_ALT_GAINTB); 698 regVal |= SM(AR_PHY_9285_ANT_DIV_GAINTB_1, AR_PHY_9285_ANT_DIV_MAIN_GAINTB); 699 } 700 else if (settings == HAL_ANT_FIXED_B) { 701 /* Diversity disabled, RX = LNA2 */ 702 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, "%s: HAL_ANT_FIXED_B\n", 703 __func__); 704 regVal |= SM(ATH_ANT_DIV_COMB_LNA1, AR_PHY_9285_ANT_DIV_ALT_LNACONF); 705 regVal |= SM(ATH_ANT_DIV_COMB_LNA2, AR_PHY_9285_ANT_DIV_MAIN_LNACONF); 706 regVal |= SM(AR_PHY_9285_ANT_DIV_GAINTB_1, AR_PHY_9285_ANT_DIV_ALT_GAINTB); 707 regVal |= SM(AR_PHY_9285_ANT_DIV_GAINTB_0, AR_PHY_9285_ANT_DIV_MAIN_GAINTB); 708 } 709 } 710 711 OS_REG_WRITE(ah, AR_PHY_MULTICHAIN_GAIN_CTL, regVal); 712 regVal = OS_REG_READ(ah, AR_PHY_MULTICHAIN_GAIN_CTL); 713 regVal = OS_REG_READ(ah, AR_PHY_CCK_DETECT); 714 regVal &= (~AR_PHY_CCK_DETECT_BB_ENABLE_ANT_FAST_DIV); 715 if (settings == HAL_ANT_VARIABLE) 716 regVal |= SM((ant_div_control1 >> 3), AR_PHY_CCK_DETECT_BB_ENABLE_ANT_FAST_DIV); 717 718 OS_REG_WRITE(ah, AR_PHY_CCK_DETECT, regVal); 719 regVal = OS_REG_READ(ah, AR_PHY_CCK_DETECT); 720 721 /* 722 * If Diversity combining is available and the diversity setting 723 * is to allow variable diversity, enable it by default. 724 * 725 * This will be eventually overridden by the software antenna 726 * diversity logic. 727 * 728 * Note that yes, this following section overrides the above 729 * settings for the LNA configuration and fast-bias. 730 */ 731 if (ar9285_check_div_comb(ah) && AH5212(ah)->ah_diversity == AH_TRUE) { 732 // If support DivComb, set MAIN to LNA1 and ALT to LNA2 at the first beginning 733 HALDEBUG(ah, HAL_DEBUG_DIVERSITY, 734 "%s: Enable initial settings for combined diversity\n", 735 __func__); 736 regVal = OS_REG_READ(ah, AR_PHY_MULTICHAIN_GAIN_CTL); 737 regVal &= (~(AR_PHY_9285_ANT_DIV_MAIN_LNACONF | AR_PHY_9285_ANT_DIV_ALT_LNACONF)); 738 regVal |= (ATH_ANT_DIV_COMB_LNA1 << AR_PHY_9285_ANT_DIV_MAIN_LNACONF_S); 739 regVal |= (ATH_ANT_DIV_COMB_LNA2 << AR_PHY_9285_ANT_DIV_ALT_LNACONF_S); 740 regVal &= (~(AR_PHY_9285_FAST_DIV_BIAS)); 741 regVal |= (0 << AR_PHY_9285_FAST_DIV_BIAS_S); 742 OS_REG_WRITE(ah, AR_PHY_MULTICHAIN_GAIN_CTL, regVal); 743 } 744 745 return AH_TRUE; 746} 747