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proc: use seq_puts()/seq_putc() where possible
[linux-2.6/next.git] / drivers / net / wireless / ath / ath9k / ar9003_calib.c
blob4a4cd88429c069076945e3d0c13807c8d83b2729
1 /*
2 * Copyright (c) 2010 Atheros Communications Inc.
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
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include "hw.h"
18 #include "hw-ops.h"
19 #include "ar9003_phy.h"
20
21 #define MPASS 3
22 #define MAX_MEASUREMENT 8
23 #define MAX_DIFFERENCE 10
24
25 struct coeff {
26 int mag_coeff[AR9300_MAX_CHAINS][MAX_MEASUREMENT][MPASS];
27 int phs_coeff[AR9300_MAX_CHAINS][MAX_MEASUREMENT][MPASS];
28 int iqc_coeff[2];
29 };
30
31 enum ar9003_cal_types {
32 IQ_MISMATCH_CAL = BIT(0),
33 TEMP_COMP_CAL = BIT(1),
34 };
35
36 static void ar9003_hw_setup_calibration(struct ath_hw *ah,
37 struct ath9k_cal_list *currCal)
38 {
39 struct ath_common *common = ath9k_hw_common(ah);
40
41 /* Select calibration to run */
42 switch (currCal->calData->calType) {
43 case IQ_MISMATCH_CAL:
44 /*
45 * Start calibration with
46 * 2^(INIT_IQCAL_LOG_COUNT_MAX+1) samples
47 */
48 REG_RMW_FIELD(ah, AR_PHY_TIMING4,
49 AR_PHY_TIMING4_IQCAL_LOG_COUNT_MAX,
50 currCal->calData->calCountMax);
51 REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_IQ);
52
53 ath_dbg(common, ATH_DBG_CALIBRATE,
54 "starting IQ Mismatch Calibration\n");
55
56 /* Kick-off cal */
57 REG_SET_BIT(ah, AR_PHY_TIMING4, AR_PHY_TIMING4_DO_CAL);
58 break;
59 case TEMP_COMP_CAL:
60 REG_RMW_FIELD(ah, AR_PHY_65NM_CH0_THERM,
61 AR_PHY_65NM_CH0_THERM_LOCAL, 1);
62 REG_RMW_FIELD(ah, AR_PHY_65NM_CH0_THERM,
63 AR_PHY_65NM_CH0_THERM_START, 1);
64
65 ath_dbg(common, ATH_DBG_CALIBRATE,
66 "starting Temperature Compensation Calibration\n");
67 break;
68 }
69 }
70
71 /*
72 * Generic calibration routine.
73 * Recalibrate the lower PHY chips to account for temperature/environment
74 * changes.
75 */
76 static bool ar9003_hw_per_calibration(struct ath_hw *ah,
77 struct ath9k_channel *ichan,
78 u8 rxchainmask,
79 struct ath9k_cal_list *currCal)
80 {
81 struct ath9k_hw_cal_data *caldata = ah->caldata;
82 /* Cal is assumed not done until explicitly set below */
83 bool iscaldone = false;
84
85 /* Calibration in progress. */
86 if (currCal->calState == CAL_RUNNING) {
87 /* Check to see if it has finished. */
88 if (!(REG_READ(ah, AR_PHY_TIMING4) & AR_PHY_TIMING4_DO_CAL)) {
89 /*
90 * Accumulate cal measures for active chains
91 */
92 currCal->calData->calCollect(ah);
93 ah->cal_samples++;
94
95 if (ah->cal_samples >=
96 currCal->calData->calNumSamples) {
97 unsigned int i, numChains = 0;
98 for (i = 0; i < AR9300_MAX_CHAINS; i++) {
99 if (rxchainmask & (1 << i))
100 numChains++;
101 }
102
103 /*
104 * Process accumulated data
105 */
106 currCal->calData->calPostProc(ah, numChains);
107
108 /* Calibration has finished. */
109 caldata->CalValid |= currCal->calData->calType;
110 currCal->calState = CAL_DONE;
111 iscaldone = true;
112 } else {
113 /*
114 * Set-up collection of another sub-sample until we
115 * get desired number
116 */
117 ar9003_hw_setup_calibration(ah, currCal);
118 }
119 }
120 } else if (!(caldata->CalValid & currCal->calData->calType)) {
121 /* If current cal is marked invalid in channel, kick it off */
122 ath9k_hw_reset_calibration(ah, currCal);
123 }
124
125 return iscaldone;
126 }
127
128 static bool ar9003_hw_calibrate(struct ath_hw *ah,
129 struct ath9k_channel *chan,
130 u8 rxchainmask,
131 bool longcal)
132 {
133 bool iscaldone = true;
134 struct ath9k_cal_list *currCal = ah->cal_list_curr;
135
136 /*
137 * For given calibration:
138 * 1. Call generic cal routine
139 * 2. When this cal is done (isCalDone) if we have more cals waiting
140 * (eg after reset), mask this to upper layers by not propagating
141 * isCalDone if it is set to TRUE.
142 * Instead, change isCalDone to FALSE and setup the waiting cal(s)
143 * to be run.
144 */
145 if (currCal &&
146 (currCal->calState == CAL_RUNNING ||
147 currCal->calState == CAL_WAITING)) {
148 iscaldone = ar9003_hw_per_calibration(ah, chan,
149 rxchainmask, currCal);
150 if (iscaldone) {
151 ah->cal_list_curr = currCal = currCal->calNext;
152
153 if (currCal->calState == CAL_WAITING) {
154 iscaldone = false;
155 ath9k_hw_reset_calibration(ah, currCal);
156 }
157 }
158 }
159
160 /* Do NF cal only at longer intervals */
161 if (longcal) {
162 /*
163 * Get the value from the previous NF cal and update
164 * history buffer.
165 */
166 ath9k_hw_getnf(ah, chan);
167
168 /*
169 * Load the NF from history buffer of the current channel.
170 * NF is slow time-variant, so it is OK to use a historical
171 * value.
172 */
173 ath9k_hw_loadnf(ah, ah->curchan);
174
175 /* start NF calibration, without updating BB NF register */
176 ath9k_hw_start_nfcal(ah, false);
177 }
178
179 return iscaldone;
180 }
181
182 static void ar9003_hw_iqcal_collect(struct ath_hw *ah)
183 {
184 int i;
185
186 /* Accumulate IQ cal measures for active chains */
187 for (i = 0; i < AR5416_MAX_CHAINS; i++) {
188 ah->totalPowerMeasI[i] +=
189 REG_READ(ah, AR_PHY_CAL_MEAS_0(i));
190 ah->totalPowerMeasQ[i] +=
191 REG_READ(ah, AR_PHY_CAL_MEAS_1(i));
192 ah->totalIqCorrMeas[i] +=
193 (int32_t) REG_READ(ah, AR_PHY_CAL_MEAS_2(i));
194 ath_dbg(ath9k_hw_common(ah), ATH_DBG_CALIBRATE,
195 "%d: Chn %d pmi=0x%08x;pmq=0x%08x;iqcm=0x%08x;\n",
196 ah->cal_samples, i, ah->totalPowerMeasI[i],
197 ah->totalPowerMeasQ[i],
198 ah->totalIqCorrMeas[i]);
199 }
200 }
201
202 static void ar9003_hw_iqcalibrate(struct ath_hw *ah, u8 numChains)
203 {
204 struct ath_common *common = ath9k_hw_common(ah);
205 u32 powerMeasQ, powerMeasI, iqCorrMeas;
206 u32 qCoffDenom, iCoffDenom;
207 int32_t qCoff, iCoff;
208 int iqCorrNeg, i;
209 static const u_int32_t offset_array[3] = {
210 AR_PHY_RX_IQCAL_CORR_B0,
211 AR_PHY_RX_IQCAL_CORR_B1,
212 AR_PHY_RX_IQCAL_CORR_B2,
213 };
214
215 for (i = 0; i < numChains; i++) {
216 powerMeasI = ah->totalPowerMeasI[i];
217 powerMeasQ = ah->totalPowerMeasQ[i];
218 iqCorrMeas = ah->totalIqCorrMeas[i];
219
220 ath_dbg(common, ATH_DBG_CALIBRATE,
221 "Starting IQ Cal and Correction for Chain %d\n",
222 i);
223
224 ath_dbg(common, ATH_DBG_CALIBRATE,
225 "Orignal: Chn %diq_corr_meas = 0x%08x\n",
226 i, ah->totalIqCorrMeas[i]);
227
228 iqCorrNeg = 0;
229
230 if (iqCorrMeas > 0x80000000) {
231 iqCorrMeas = (0xffffffff - iqCorrMeas) + 1;
232 iqCorrNeg = 1;
233 }
234
235 ath_dbg(common, ATH_DBG_CALIBRATE,
236 "Chn %d pwr_meas_i = 0x%08x\n", i, powerMeasI);
237 ath_dbg(common, ATH_DBG_CALIBRATE,
238 "Chn %d pwr_meas_q = 0x%08x\n", i, powerMeasQ);
239 ath_dbg(common, ATH_DBG_CALIBRATE, "iqCorrNeg is 0x%08x\n",
240 iqCorrNeg);
241
242 iCoffDenom = (powerMeasI / 2 + powerMeasQ / 2) / 256;
243 qCoffDenom = powerMeasQ / 64;
244
245 if ((iCoffDenom != 0) && (qCoffDenom != 0)) {
246 iCoff = iqCorrMeas / iCoffDenom;
247 qCoff = powerMeasI / qCoffDenom - 64;
248 ath_dbg(common, ATH_DBG_CALIBRATE,
249 "Chn %d iCoff = 0x%08x\n", i, iCoff);
250 ath_dbg(common, ATH_DBG_CALIBRATE,
251 "Chn %d qCoff = 0x%08x\n", i, qCoff);
252
253 /* Force bounds on iCoff */
254 if (iCoff >= 63)
255 iCoff = 63;
256 else if (iCoff <= -63)
257 iCoff = -63;
258
259 /* Negate iCoff if iqCorrNeg == 0 */
260 if (iqCorrNeg == 0x0)
261 iCoff = -iCoff;
262
263 /* Force bounds on qCoff */
264 if (qCoff >= 63)
265 qCoff = 63;
266 else if (qCoff <= -63)
267 qCoff = -63;
268
269 iCoff = iCoff & 0x7f;
270 qCoff = qCoff & 0x7f;
271
272 ath_dbg(common, ATH_DBG_CALIBRATE,
273 "Chn %d : iCoff = 0x%x qCoff = 0x%x\n",
274 i, iCoff, qCoff);
275 ath_dbg(common, ATH_DBG_CALIBRATE,
276 "Register offset (0x%04x) before update = 0x%x\n",
277 offset_array[i],
278 REG_READ(ah, offset_array[i]));
279
280 REG_RMW_FIELD(ah, offset_array[i],
281 AR_PHY_RX_IQCAL_CORR_IQCORR_Q_I_COFF,
282 iCoff);
283 REG_RMW_FIELD(ah, offset_array[i],
284 AR_PHY_RX_IQCAL_CORR_IQCORR_Q_Q_COFF,
285 qCoff);
286 ath_dbg(common, ATH_DBG_CALIBRATE,
287 "Register offset (0x%04x) QI COFF (bitfields 0x%08x) after update = 0x%x\n",
288 offset_array[i],
289 AR_PHY_RX_IQCAL_CORR_IQCORR_Q_I_COFF,
290 REG_READ(ah, offset_array[i]));
291 ath_dbg(common, ATH_DBG_CALIBRATE,
292 "Register offset (0x%04x) QQ COFF (bitfields 0x%08x) after update = 0x%x\n",
293 offset_array[i],
294 AR_PHY_RX_IQCAL_CORR_IQCORR_Q_Q_COFF,
295 REG_READ(ah, offset_array[i]));
296
297 ath_dbg(common, ATH_DBG_CALIBRATE,
298 "IQ Cal and Correction done for Chain %d\n", i);
299 }
300 }
301
302 REG_SET_BIT(ah, AR_PHY_RX_IQCAL_CORR_B0,
303 AR_PHY_RX_IQCAL_CORR_IQCORR_ENABLE);
304 ath_dbg(common, ATH_DBG_CALIBRATE,
305 "IQ Cal and Correction (offset 0x%04x) enabled (bit position 0x%08x). New Value 0x%08x\n",
306 (unsigned) (AR_PHY_RX_IQCAL_CORR_B0),
307 AR_PHY_RX_IQCAL_CORR_IQCORR_ENABLE,
308 REG_READ(ah, AR_PHY_RX_IQCAL_CORR_B0));
309 }
310
311 static const struct ath9k_percal_data iq_cal_single_sample = {
312 IQ_MISMATCH_CAL,
313 MIN_CAL_SAMPLES,
314 PER_MAX_LOG_COUNT,
315 ar9003_hw_iqcal_collect,
316 ar9003_hw_iqcalibrate
317 };
318
319 static void ar9003_hw_init_cal_settings(struct ath_hw *ah)
320 {
321 ah->iq_caldata.calData = &iq_cal_single_sample;
322 }
323
324 /*
325 * solve 4x4 linear equation used in loopback iq cal.
326 */
327 static bool ar9003_hw_solve_iq_cal(struct ath_hw *ah,
328 s32 sin_2phi_1,
329 s32 cos_2phi_1,
330 s32 sin_2phi_2,
331 s32 cos_2phi_2,
332 s32 mag_a0_d0,
333 s32 phs_a0_d0,
334 s32 mag_a1_d0,
335 s32 phs_a1_d0,
336 s32 solved_eq[])
337 {
338 s32 f1 = cos_2phi_1 - cos_2phi_2,
339 f3 = sin_2phi_1 - sin_2phi_2,
340 f2;
341 s32 mag_tx, phs_tx, mag_rx, phs_rx;
342 const s32 result_shift = 1 << 15;
343 struct ath_common *common = ath9k_hw_common(ah);
344
345 f2 = (f1 * f1 + f3 * f3) / result_shift;
346
347 if (!f2) {
348 ath_dbg(common, ATH_DBG_CALIBRATE, "Divide by 0\n");
349 return false;
350 }
351
352 /* mag mismatch, tx */
353 mag_tx = f1 * (mag_a0_d0 - mag_a1_d0) + f3 * (phs_a0_d0 - phs_a1_d0);
354 /* phs mismatch, tx */
355 phs_tx = f3 * (-mag_a0_d0 + mag_a1_d0) + f1 * (phs_a0_d0 - phs_a1_d0);
356
357 mag_tx = (mag_tx / f2);
358 phs_tx = (phs_tx / f2);
359
360 /* mag mismatch, rx */
361 mag_rx = mag_a0_d0 - (cos_2phi_1 * mag_tx + sin_2phi_1 * phs_tx) /
362 result_shift;
363 /* phs mismatch, rx */
364 phs_rx = phs_a0_d0 + (sin_2phi_1 * mag_tx - cos_2phi_1 * phs_tx) /
365 result_shift;
366
367 solved_eq[0] = mag_tx;
368 solved_eq[1] = phs_tx;
369 solved_eq[2] = mag_rx;
370 solved_eq[3] = phs_rx;
371
372 return true;
373 }
374
375 static s32 ar9003_hw_find_mag_approx(struct ath_hw *ah, s32 in_re, s32 in_im)
376 {
377 s32 abs_i = abs(in_re),
378 abs_q = abs(in_im),
379 max_abs, min_abs;
380
381 if (abs_i > abs_q) {
382 max_abs = abs_i;
383 min_abs = abs_q;
384 } else {
385 max_abs = abs_q;
386 min_abs = abs_i;
387 }
388
389 return max_abs - (max_abs / 32) + (min_abs / 8) + (min_abs / 4);
390 }
391
392 #define DELPT 32
393
394 static bool ar9003_hw_calc_iq_corr(struct ath_hw *ah,
395 s32 chain_idx,
396 const s32 iq_res[],
397 s32 iqc_coeff[])
398 {
399 s32 i2_m_q2_a0_d0, i2_p_q2_a0_d0, iq_corr_a0_d0,
400 i2_m_q2_a0_d1, i2_p_q2_a0_d1, iq_corr_a0_d1,
401 i2_m_q2_a1_d0, i2_p_q2_a1_d0, iq_corr_a1_d0,
402 i2_m_q2_a1_d1, i2_p_q2_a1_d1, iq_corr_a1_d1;
403 s32 mag_a0_d0, mag_a1_d0, mag_a0_d1, mag_a1_d1,
404 phs_a0_d0, phs_a1_d0, phs_a0_d1, phs_a1_d1,
405 sin_2phi_1, cos_2phi_1,
406 sin_2phi_2, cos_2phi_2;
407 s32 mag_tx, phs_tx, mag_rx, phs_rx;
408 s32 solved_eq[4], mag_corr_tx, phs_corr_tx, mag_corr_rx, phs_corr_rx,
409 q_q_coff, q_i_coff;
410 const s32 res_scale = 1 << 15;
411 const s32 delpt_shift = 1 << 8;
412 s32 mag1, mag2;
413 struct ath_common *common = ath9k_hw_common(ah);
414
415 i2_m_q2_a0_d0 = iq_res[0] & 0xfff;
416 i2_p_q2_a0_d0 = (iq_res[0] >> 12) & 0xfff;
417 iq_corr_a0_d0 = ((iq_res[0] >> 24) & 0xff) + ((iq_res[1] & 0xf) << 8);
418
419 if (i2_m_q2_a0_d0 > 0x800)
420 i2_m_q2_a0_d0 = -((0xfff - i2_m_q2_a0_d0) + 1);
421
422 if (i2_p_q2_a0_d0 > 0x800)
423 i2_p_q2_a0_d0 = -((0xfff - i2_p_q2_a0_d0) + 1);
424
425 if (iq_corr_a0_d0 > 0x800)
426 iq_corr_a0_d0 = -((0xfff - iq_corr_a0_d0) + 1);
427
428 i2_m_q2_a0_d1 = (iq_res[1] >> 4) & 0xfff;
429 i2_p_q2_a0_d1 = (iq_res[2] & 0xfff);
430 iq_corr_a0_d1 = (iq_res[2] >> 12) & 0xfff;
431
432 if (i2_m_q2_a0_d1 > 0x800)
433 i2_m_q2_a0_d1 = -((0xfff - i2_m_q2_a0_d1) + 1);
434
435 if (i2_p_q2_a0_d1 > 0x800)
436 i2_p_q2_a0_d1 = -((0xfff - i2_p_q2_a0_d1) + 1);
437
438 if (iq_corr_a0_d1 > 0x800)
439 iq_corr_a0_d1 = -((0xfff - iq_corr_a0_d1) + 1);
440
441 i2_m_q2_a1_d0 = ((iq_res[2] >> 24) & 0xff) + ((iq_res[3] & 0xf) << 8);
442 i2_p_q2_a1_d0 = (iq_res[3] >> 4) & 0xfff;
443 iq_corr_a1_d0 = iq_res[4] & 0xfff;
444
445 if (i2_m_q2_a1_d0 > 0x800)
446 i2_m_q2_a1_d0 = -((0xfff - i2_m_q2_a1_d0) + 1);
447
448 if (i2_p_q2_a1_d0 > 0x800)
449 i2_p_q2_a1_d0 = -((0xfff - i2_p_q2_a1_d0) + 1);
450
451 if (iq_corr_a1_d0 > 0x800)
452 iq_corr_a1_d0 = -((0xfff - iq_corr_a1_d0) + 1);
453
454 i2_m_q2_a1_d1 = (iq_res[4] >> 12) & 0xfff;
455 i2_p_q2_a1_d1 = ((iq_res[4] >> 24) & 0xff) + ((iq_res[5] & 0xf) << 8);
456 iq_corr_a1_d1 = (iq_res[5] >> 4) & 0xfff;
457
458 if (i2_m_q2_a1_d1 > 0x800)
459 i2_m_q2_a1_d1 = -((0xfff - i2_m_q2_a1_d1) + 1);
460
461 if (i2_p_q2_a1_d1 > 0x800)
462 i2_p_q2_a1_d1 = -((0xfff - i2_p_q2_a1_d1) + 1);
463
464 if (iq_corr_a1_d1 > 0x800)
465 iq_corr_a1_d1 = -((0xfff - iq_corr_a1_d1) + 1);
466
467 if ((i2_p_q2_a0_d0 == 0) || (i2_p_q2_a0_d1 == 0) ||
468 (i2_p_q2_a1_d0 == 0) || (i2_p_q2_a1_d1 == 0)) {
469 ath_dbg(common, ATH_DBG_CALIBRATE,
470 "Divide by 0:\n"
471 "a0_d0=%d\n"
472 "a0_d1=%d\n"
473 "a2_d0=%d\n"
474 "a1_d1=%d\n",
475 i2_p_q2_a0_d0, i2_p_q2_a0_d1,
476 i2_p_q2_a1_d0, i2_p_q2_a1_d1);
477 return false;
478 }
479
480 mag_a0_d0 = (i2_m_q2_a0_d0 * res_scale) / i2_p_q2_a0_d0;
481 phs_a0_d0 = (iq_corr_a0_d0 * res_scale) / i2_p_q2_a0_d0;
482
483 mag_a0_d1 = (i2_m_q2_a0_d1 * res_scale) / i2_p_q2_a0_d1;
484 phs_a0_d1 = (iq_corr_a0_d1 * res_scale) / i2_p_q2_a0_d1;
485
486 mag_a1_d0 = (i2_m_q2_a1_d0 * res_scale) / i2_p_q2_a1_d0;
487 phs_a1_d0 = (iq_corr_a1_d0 * res_scale) / i2_p_q2_a1_d0;
488
489 mag_a1_d1 = (i2_m_q2_a1_d1 * res_scale) / i2_p_q2_a1_d1;
490 phs_a1_d1 = (iq_corr_a1_d1 * res_scale) / i2_p_q2_a1_d1;
491
492 /* w/o analog phase shift */
493 sin_2phi_1 = (((mag_a0_d0 - mag_a0_d1) * delpt_shift) / DELPT);
494 /* w/o analog phase shift */
495 cos_2phi_1 = (((phs_a0_d1 - phs_a0_d0) * delpt_shift) / DELPT);
496 /* w/ analog phase shift */
497 sin_2phi_2 = (((mag_a1_d0 - mag_a1_d1) * delpt_shift) / DELPT);
498 /* w/ analog phase shift */
499 cos_2phi_2 = (((phs_a1_d1 - phs_a1_d0) * delpt_shift) / DELPT);
500
501 /*
502 * force sin^2 + cos^2 = 1;
503 * find magnitude by approximation
504 */
505 mag1 = ar9003_hw_find_mag_approx(ah, cos_2phi_1, sin_2phi_1);
506 mag2 = ar9003_hw_find_mag_approx(ah, cos_2phi_2, sin_2phi_2);
507
508 if ((mag1 == 0) || (mag2 == 0)) {
509 ath_dbg(common, ATH_DBG_CALIBRATE,
510 "Divide by 0: mag1=%d, mag2=%d\n",
511 mag1, mag2);
512 return false;
513 }
514
515 /* normalization sin and cos by mag */
516 sin_2phi_1 = (sin_2phi_1 * res_scale / mag1);
517 cos_2phi_1 = (cos_2phi_1 * res_scale / mag1);
518 sin_2phi_2 = (sin_2phi_2 * res_scale / mag2);
519 cos_2phi_2 = (cos_2phi_2 * res_scale / mag2);
520
521 /* calculate IQ mismatch */
522 if (!ar9003_hw_solve_iq_cal(ah,
523 sin_2phi_1, cos_2phi_1,
524 sin_2phi_2, cos_2phi_2,
525 mag_a0_d0, phs_a0_d0,
526 mag_a1_d0,
527 phs_a1_d0, solved_eq)) {
528 ath_dbg(common, ATH_DBG_CALIBRATE,
529 "Call to ar9003_hw_solve_iq_cal() failed.\n");
530 return false;
531 }
532
533 mag_tx = solved_eq[0];
534 phs_tx = solved_eq[1];
535 mag_rx = solved_eq[2];
536 phs_rx = solved_eq[3];
537
538 ath_dbg(common, ATH_DBG_CALIBRATE,
539 "chain %d: mag mismatch=%d phase mismatch=%d\n",
540 chain_idx, mag_tx/res_scale, phs_tx/res_scale);
541
542 if (res_scale == mag_tx) {
543 ath_dbg(common, ATH_DBG_CALIBRATE,
544 "Divide by 0: mag_tx=%d, res_scale=%d\n",
545 mag_tx, res_scale);
546 return false;
547 }
548
549 /* calculate and quantize Tx IQ correction factor */
550 mag_corr_tx = (mag_tx * res_scale) / (res_scale - mag_tx);
551 phs_corr_tx = -phs_tx;
552
553 q_q_coff = (mag_corr_tx * 128 / res_scale);
554 q_i_coff = (phs_corr_tx * 256 / res_scale);
555
556 ath_dbg(common, ATH_DBG_CALIBRATE,
557 "tx chain %d: mag corr=%d phase corr=%d\n",
558 chain_idx, q_q_coff, q_i_coff);
559
560 if (q_i_coff < -63)
561 q_i_coff = -63;
562 if (q_i_coff > 63)
563 q_i_coff = 63;
564 if (q_q_coff < -63)
565 q_q_coff = -63;
566 if (q_q_coff > 63)
567 q_q_coff = 63;
568
569 iqc_coeff[0] = (q_q_coff * 128) + q_i_coff;
570
571 ath_dbg(common, ATH_DBG_CALIBRATE,
572 "tx chain %d: iq corr coeff=%x\n",
573 chain_idx, iqc_coeff[0]);
574
575 if (-mag_rx == res_scale) {
576 ath_dbg(common, ATH_DBG_CALIBRATE,
577 "Divide by 0: mag_rx=%d, res_scale=%d\n",
578 mag_rx, res_scale);
579 return false;
580 }
581
582 /* calculate and quantize Rx IQ correction factors */
583 mag_corr_rx = (-mag_rx * res_scale) / (res_scale + mag_rx);
584 phs_corr_rx = -phs_rx;
585
586 q_q_coff = (mag_corr_rx * 128 / res_scale);
587 q_i_coff = (phs_corr_rx * 256 / res_scale);
588
589 ath_dbg(common, ATH_DBG_CALIBRATE,
590 "rx chain %d: mag corr=%d phase corr=%d\n",
591 chain_idx, q_q_coff, q_i_coff);
592
593 if (q_i_coff < -63)
594 q_i_coff = -63;
595 if (q_i_coff > 63)
596 q_i_coff = 63;
597 if (q_q_coff < -63)
598 q_q_coff = -63;
599 if (q_q_coff > 63)
600 q_q_coff = 63;
601
602 iqc_coeff[1] = (q_q_coff * 128) + q_i_coff;
603
604 ath_dbg(common, ATH_DBG_CALIBRATE,
605 "rx chain %d: iq corr coeff=%x\n",
606 chain_idx, iqc_coeff[1]);
607
608 return true;
609 }
610
611 static bool ar9003_hw_compute_closest_pass_and_avg(int *mp_coeff, int *mp_avg)
612 {
613 int diff[MPASS];
614
615 diff[0] = abs(mp_coeff[0] - mp_coeff[1]);
616 diff[1] = abs(mp_coeff[1] - mp_coeff[2]);
617 diff[2] = abs(mp_coeff[2] - mp_coeff[0]);
618
619 if (diff[0] > MAX_DIFFERENCE &&
620 diff[1] > MAX_DIFFERENCE &&
621 diff[2] > MAX_DIFFERENCE)
622 return false;
623
624 if (diff[0] <= diff[1] && diff[0] <= diff[2])
625 *mp_avg = (mp_coeff[0] + mp_coeff[1]) / 2;
626 else if (diff[1] <= diff[2])
627 *mp_avg = (mp_coeff[1] + mp_coeff[2]) / 2;
628 else
629 *mp_avg = (mp_coeff[2] + mp_coeff[0]) / 2;
630
631 return true;
632 }
633
634 static void ar9003_hw_tx_iqcal_load_avg_2_passes(struct ath_hw *ah,
635 u8 num_chains,
636 struct coeff *coeff)
637 {
638 struct ath_common *common = ath9k_hw_common(ah);
639 int i, im, nmeasurement;
640 int magnitude, phase;
641 u32 tx_corr_coeff[MAX_MEASUREMENT][AR9300_MAX_CHAINS];
642
643 memset(tx_corr_coeff, 0, sizeof(tx_corr_coeff));
644 for (i = 0; i < MAX_MEASUREMENT / 2; i++) {
645 tx_corr_coeff[i * 2][0] = tx_corr_coeff[(i * 2) + 1][0] =
646 AR_PHY_TX_IQCAL_CORR_COEFF_B0(i);
647 if (!AR_SREV_9485(ah)) {
648 tx_corr_coeff[i * 2][1] =
649 tx_corr_coeff[(i * 2) + 1][1] =
650 AR_PHY_TX_IQCAL_CORR_COEFF_B1(i);
651
652 tx_corr_coeff[i * 2][2] =
653 tx_corr_coeff[(i * 2) + 1][2] =
654 AR_PHY_TX_IQCAL_CORR_COEFF_B2(i);
655 }
656 }
657
658 /* Load the average of 2 passes */
659 for (i = 0; i < num_chains; i++) {
660 if (AR_SREV_9485(ah))
661 nmeasurement = REG_READ_FIELD(ah,
662 AR_PHY_TX_IQCAL_STATUS_B0_9485,
663 AR_PHY_CALIBRATED_GAINS_0);
664 else
665 nmeasurement = REG_READ_FIELD(ah,
666 AR_PHY_TX_IQCAL_STATUS_B0,
667 AR_PHY_CALIBRATED_GAINS_0);
668
669 if (nmeasurement > MAX_MEASUREMENT)
670 nmeasurement = MAX_MEASUREMENT;
671
672 for (im = 0; im < nmeasurement; im++) {
673 /*
674 * Determine which 2 passes are closest and compute avg
675 * magnitude
676 */
677 if (!ar9003_hw_compute_closest_pass_and_avg(coeff->mag_coeff[i][im],
678 &magnitude))
679 goto disable_txiqcal;
680
681 /*
682 * Determine which 2 passes are closest and compute avg
683 * phase
684 */
685 if (!ar9003_hw_compute_closest_pass_and_avg(coeff->phs_coeff[i][im],
686 &phase))
687 goto disable_txiqcal;
688
689 coeff->iqc_coeff[0] = (magnitude & 0x7f) |
690 ((phase & 0x7f) << 7);
691
692 if ((im % 2) == 0)
693 REG_RMW_FIELD(ah, tx_corr_coeff[im][i],
694 AR_PHY_TX_IQCAL_CORR_COEFF_00_COEFF_TABLE,
695 coeff->iqc_coeff[0]);
696 else
697 REG_RMW_FIELD(ah, tx_corr_coeff[im][i],
698 AR_PHY_TX_IQCAL_CORR_COEFF_01_COEFF_TABLE,
699 coeff->iqc_coeff[0]);
700 }
701 }
702
703 REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_CONTROL_3,
704 AR_PHY_TX_IQCAL_CONTROL_3_IQCORR_EN, 0x1);
705 REG_RMW_FIELD(ah, AR_PHY_RX_IQCAL_CORR_B0,
706 AR_PHY_RX_IQCAL_CORR_B0_LOOPBACK_IQCORR_EN, 0x1);
707
708 return;
709
710 disable_txiqcal:
711 REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_CONTROL_3,
712 AR_PHY_TX_IQCAL_CONTROL_3_IQCORR_EN, 0x0);
713 REG_RMW_FIELD(ah, AR_PHY_RX_IQCAL_CORR_B0,
714 AR_PHY_RX_IQCAL_CORR_B0_LOOPBACK_IQCORR_EN, 0x0);
715
716 ath_dbg(common, ATH_DBG_CALIBRATE, "TX IQ Cal disabled\n");
717 }
718
719 static void ar9003_hw_tx_iq_cal(struct ath_hw *ah)
720 {
721 struct ath_common *common = ath9k_hw_common(ah);
722 static const u32 txiqcal_status[AR9300_MAX_CHAINS] = {
723 AR_PHY_TX_IQCAL_STATUS_B0,
724 AR_PHY_TX_IQCAL_STATUS_B1,
725 AR_PHY_TX_IQCAL_STATUS_B2,
726 };
727 static const u32 chan_info_tab[] = {
728 AR_PHY_CHAN_INFO_TAB_0,
729 AR_PHY_CHAN_INFO_TAB_1,
730 AR_PHY_CHAN_INFO_TAB_2,
731 };
732 struct coeff coeff;
733 s32 iq_res[6];
734 s32 i, j, ip, im, nmeasurement;
735 u8 nchains = get_streams(common->tx_chainmask);
736
737 for (ip = 0; ip < MPASS; ip++) {
738 REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_CONTROL_1,
739 AR_PHY_TX_IQCAQL_CONTROL_1_IQCORR_I_Q_COFF_DELPT,
740 DELPT);
741 REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_START,
742 AR_PHY_TX_IQCAL_START_DO_CAL,
743 AR_PHY_TX_IQCAL_START_DO_CAL);
744
745 if (!ath9k_hw_wait(ah, AR_PHY_TX_IQCAL_START,
746 AR_PHY_TX_IQCAL_START_DO_CAL,
747 0, AH_WAIT_TIMEOUT)) {
748 ath_dbg(common, ATH_DBG_CALIBRATE,
749 "Tx IQ Cal not complete.\n");
750 goto TX_IQ_CAL_FAILED;
751 }
752
753 nmeasurement = REG_READ_FIELD(ah, AR_PHY_TX_IQCAL_STATUS_B0,
754 AR_PHY_CALIBRATED_GAINS_0);
755 if (nmeasurement > MAX_MEASUREMENT)
756 nmeasurement = MAX_MEASUREMENT;
757
758 for (i = 0; i < nchains; i++) {
759 ath_dbg(common, ATH_DBG_CALIBRATE,
760 "Doing Tx IQ Cal for chain %d.\n", i);
761 for (im = 0; im < nmeasurement; im++) {
762 if (REG_READ(ah, txiqcal_status[i]) &
763 AR_PHY_TX_IQCAL_STATUS_FAILED) {
764 ath_dbg(common, ATH_DBG_CALIBRATE,
765 "Tx IQ Cal failed for chain %d.\n", i);
766 goto TX_IQ_CAL_FAILED;
767 }
768
769 for (j = 0; j < 3; j++) {
770 u8 idx = 2 * j,
771 offset = 4 * (3 * im + j);
772
773 REG_RMW_FIELD(ah, AR_PHY_CHAN_INFO_MEMORY,
774 AR_PHY_CHAN_INFO_TAB_S2_READ,
775 0);
776
777 /* 32 bits */
778 iq_res[idx] = REG_READ(ah,
779 chan_info_tab[i] +
780 offset);
781
782 REG_RMW_FIELD(ah, AR_PHY_CHAN_INFO_MEMORY,
783 AR_PHY_CHAN_INFO_TAB_S2_READ,
784 1);
785
786 /* 16 bits */
787 iq_res[idx+1] = 0xffff & REG_READ(ah,
788 chan_info_tab[i] +
789 offset);
790
791 ath_dbg(common, ATH_DBG_CALIBRATE,
792 "IQ RES[%d]=0x%x IQ_RES[%d]=0x%x\n",
793 idx, iq_res[idx], idx+1, iq_res[idx+1]);
794 }
795
796 if (!ar9003_hw_calc_iq_corr(ah, i, iq_res,
797 coeff.iqc_coeff)) {
798 ath_dbg(common, ATH_DBG_CALIBRATE,
799 "Failed in calculation of IQ correction.\n");
800 goto TX_IQ_CAL_FAILED;
801 }
802 coeff.mag_coeff[i][im][ip] =
803 coeff.iqc_coeff[0] & 0x7f;
804 coeff.phs_coeff[i][im][ip] =
805 (coeff.iqc_coeff[0] >> 7) & 0x7f;
806
807 if (coeff.mag_coeff[i][im][ip] > 63)
808 coeff.mag_coeff[i][im][ip] -= 128;
809 if (coeff.phs_coeff[i][im][ip] > 63)
810 coeff.phs_coeff[i][im][ip] -= 128;
811
812 }
813 }
814 }
815
816 ar9003_hw_tx_iqcal_load_avg_2_passes(ah, nchains, &coeff);
817
818 return;
819
820 TX_IQ_CAL_FAILED:
821 ath_dbg(common, ATH_DBG_CALIBRATE, "Tx IQ Cal failed\n");
822 }
823
824 static void ar9003_hw_tx_iq_cal_run(struct ath_hw *ah)
825 {
826 u8 tx_gain_forced;
827
828 REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_CONTROL_1_9485,
829 AR_PHY_TX_IQCAQL_CONTROL_1_IQCORR_I_Q_COFF_DELPT, DELPT);
830 tx_gain_forced = REG_READ_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
831 AR_PHY_TXGAIN_FORCE);
832 if (tx_gain_forced)
833 REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
834 AR_PHY_TXGAIN_FORCE, 0);
835
836 REG_RMW_FIELD(ah, AR_PHY_TX_IQCAL_START_9485,
837 AR_PHY_TX_IQCAL_START_DO_CAL_9485, 1);
838 }
839
840 static void ar9003_hw_tx_iq_cal_post_proc(struct ath_hw *ah)
841 {
842 struct ath_common *common = ath9k_hw_common(ah);
843 const u32 txiqcal_status[AR9300_MAX_CHAINS] = {
844 AR_PHY_TX_IQCAL_STATUS_B0_9485,
845 AR_PHY_TX_IQCAL_STATUS_B1,
846 AR_PHY_TX_IQCAL_STATUS_B2,
847 };
848 const u_int32_t chan_info_tab[] = {
849 AR_PHY_CHAN_INFO_TAB_0,
850 AR_PHY_CHAN_INFO_TAB_1,
851 AR_PHY_CHAN_INFO_TAB_2,
852 };
853 struct coeff coeff;
854 s32 iq_res[6];
855 u8 num_chains = 0;
856 int i, ip, im, j;
857 int nmeasurement;
858
859 for (i = 0; i < AR9300_MAX_CHAINS; i++) {
860 if (ah->txchainmask & (1 << i))
861 num_chains++;
862 }
863
864 for (ip = 0; ip < MPASS; ip++) {
865 for (i = 0; i < num_chains; i++) {
866 nmeasurement = REG_READ_FIELD(ah,
867 AR_PHY_TX_IQCAL_STATUS_B0_9485,
868 AR_PHY_CALIBRATED_GAINS_0);
869 if (nmeasurement > MAX_MEASUREMENT)
870 nmeasurement = MAX_MEASUREMENT;
871
872 for (im = 0; im < nmeasurement; im++) {
873 ath_dbg(common, ATH_DBG_CALIBRATE,
874 "Doing Tx IQ Cal for chain %d.\n", i);
875
876 if (REG_READ(ah, txiqcal_status[i]) &
877 AR_PHY_TX_IQCAL_STATUS_FAILED) {
878 ath_dbg(common, ATH_DBG_CALIBRATE,
879 "Tx IQ Cal failed for chain %d.\n", i);
880 goto tx_iqcal_fail;
881 }
882
883 for (j = 0; j < 3; j++) {
884 u32 idx = 2 * j, offset = 4 * (3 * im + j);
885
886 REG_RMW_FIELD(ah,
887 AR_PHY_CHAN_INFO_MEMORY,
888 AR_PHY_CHAN_INFO_TAB_S2_READ,
889 0);
890
891 /* 32 bits */
892 iq_res[idx] = REG_READ(ah,
893 chan_info_tab[i] +
894 offset);
895
896 REG_RMW_FIELD(ah,
897 AR_PHY_CHAN_INFO_MEMORY,
898 AR_PHY_CHAN_INFO_TAB_S2_READ,
899 1);
900
901 /* 16 bits */
902 iq_res[idx + 1] = 0xffff & REG_READ(ah,
903 chan_info_tab[i] + offset);
904
905 ath_dbg(common, ATH_DBG_CALIBRATE,
906 "IQ RES[%d]=0x%x"
907 "IQ_RES[%d]=0x%x\n",
908 idx, iq_res[idx], idx + 1,
909 iq_res[idx + 1]);
910 }
911
912 if (!ar9003_hw_calc_iq_corr(ah, i, iq_res,
913 coeff.iqc_coeff)) {
914 ath_dbg(common, ATH_DBG_CALIBRATE,
915 "Failed in calculation of IQ correction.\n");
916 goto tx_iqcal_fail;
917 }
918
919 coeff.mag_coeff[i][im][ip] =
920 coeff.iqc_coeff[0] & 0x7f;
921 coeff.phs_coeff[i][im][ip] =
922 (coeff.iqc_coeff[0] >> 7) & 0x7f;
923
924 if (coeff.mag_coeff[i][im][ip] > 63)
925 coeff.mag_coeff[i][im][ip] -= 128;
926 if (coeff.phs_coeff[i][im][ip] > 63)
927 coeff.phs_coeff[i][im][ip] -= 128;
928 }
929 }
930 }
931 ar9003_hw_tx_iqcal_load_avg_2_passes(ah, num_chains, &coeff);
932
933 return;
934
935 tx_iqcal_fail:
936 ath_dbg(common, ATH_DBG_CALIBRATE, "Tx IQ Cal failed\n");
937 return;
938 }
939 static bool ar9003_hw_init_cal(struct ath_hw *ah,
940 struct ath9k_channel *chan)
941 {
942 struct ath_common *common = ath9k_hw_common(ah);
943 int val;
944
945 val = REG_READ(ah, AR_ENT_OTP);
946 ath_dbg(common, ATH_DBG_CALIBRATE, "ath9k: AR_ENT_OTP 0x%x\n", val);
947
948 if (AR_SREV_9485(ah))
949 ar9003_hw_set_chain_masks(ah, 0x1, 0x1);
950 else if (val & AR_ENT_OTP_CHAIN2_DISABLE)
951 ar9003_hw_set_chain_masks(ah, 0x3, 0x3);
952 else
953 /*
954 * 0x7 = 0b111 , AR9003 needs to be configured for 3-chain
955 * mode before running AGC/TxIQ cals
956 */
957 ar9003_hw_set_chain_masks(ah, 0x7, 0x7);
958
959 /* Do Tx IQ Calibration */
960 if (AR_SREV_9485(ah))
961 ar9003_hw_tx_iq_cal_run(ah);
962 else
963 ar9003_hw_tx_iq_cal(ah);
964
965 REG_WRITE(ah, AR_PHY_ACTIVE, AR_PHY_ACTIVE_DIS);
966 udelay(5);
967 REG_WRITE(ah, AR_PHY_ACTIVE, AR_PHY_ACTIVE_EN);
968
969 /* Calibrate the AGC */
970 REG_WRITE(ah, AR_PHY_AGC_CONTROL,
971 REG_READ(ah, AR_PHY_AGC_CONTROL) |
972 AR_PHY_AGC_CONTROL_CAL);
973
974 /* Poll for offset calibration complete */
975 if (!ath9k_hw_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL,
976 0, AH_WAIT_TIMEOUT)) {
977 ath_dbg(common, ATH_DBG_CALIBRATE,
978 "offset calibration failed to complete in 1ms; noisy environment?\n");
979 return false;
980 }
981
982 if (AR_SREV_9485(ah))
983 ar9003_hw_tx_iq_cal_post_proc(ah);
984
985 /* Revert chainmasks to their original values before NF cal */
986 ar9003_hw_set_chain_masks(ah, ah->rxchainmask, ah->txchainmask);
987
988 ath9k_hw_start_nfcal(ah, true);
989
990 /* Initialize list pointers */
991 ah->cal_list = ah->cal_list_last = ah->cal_list_curr = NULL;
992 ah->supp_cals = IQ_MISMATCH_CAL;
993
994 if (ah->supp_cals & IQ_MISMATCH_CAL) {
995 INIT_CAL(&ah->iq_caldata);
996 INSERT_CAL(ah, &ah->iq_caldata);
997 ath_dbg(common, ATH_DBG_CALIBRATE,
998 "enabling IQ Calibration.\n");
999 }
1000
1001 if (ah->supp_cals & TEMP_COMP_CAL) {
1002 INIT_CAL(&ah->tempCompCalData);
1003 INSERT_CAL(ah, &ah->tempCompCalData);
1004 ath_dbg(common, ATH_DBG_CALIBRATE,
1005 "enabling Temperature Compensation Calibration.\n");
1006 }
1007
1008 /* Initialize current pointer to first element in list */
1009 ah->cal_list_curr = ah->cal_list;
1010
1011 if (ah->cal_list_curr)
1012 ath9k_hw_reset_calibration(ah, ah->cal_list_curr);
1013
1014 if (ah->caldata)
1015 ah->caldata->CalValid = 0;
1016
1017 return true;
1018 }
1019
1020 void ar9003_hw_attach_calib_ops(struct ath_hw *ah)
1021 {
1022 struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah);
1023 struct ath_hw_ops *ops = ath9k_hw_ops(ah);
1024
1025 priv_ops->init_cal_settings = ar9003_hw_init_cal_settings;
1026 priv_ops->init_cal = ar9003_hw_init_cal;
1027 priv_ops->setup_calibration = ar9003_hw_setup_calibration;
1028
1029 ops->calibrate = ar9003_hw_calibrate;
1030 }
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