1 /*
2 
3   Broadcom B43 wireless driver
4 
5   G PHY LO (LocalOscillator) Measuring and Control routines
6 
7   Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
8   Copyright (c) 2005, 2006 Stefano Brivio <stefano.brivio@polimi.it>
9   Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
10   Copyright (c) 2005, 2006 Danny van Dyk <kugelfang@gentoo.org>
11   Copyright (c) 2005, 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch>
12 
13   This program is free software; you can redistribute it and/or modify
14   it under the terms of the GNU General Public License as published by
15   the Free Software Foundation; either version 2 of the License, or
16   (at your option) any later version.
17 
18   This program is distributed in the hope that it will be useful,
19   but WITHOUT ANY WARRANTY; without even the implied warranty of
20   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21   GNU General Public License for more details.
22 
23   You should have received a copy of the GNU General Public License
24   along with this program; see the file COPYING.  If not, write to
25   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
26   Boston, MA 02110-1301, USA.
27 
28 */
29 
30 #include "b43.h"
31 #include "lo.h"
32 #include "phy_g.h"
33 #include "main.h"
34 
35 #include <linux/delay.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 
39 
40 static struct b43_lo_calib *b43_find_lo_calib(struct b43_txpower_lo_control *lo,
41 					      const struct b43_bbatt *bbatt,
42 					       const struct b43_rfatt *rfatt)
43 {
44 	struct b43_lo_calib *c;
45 
46 	list_for_each_entry(c, &lo->calib_list, list) {
47 		if (!b43_compare_bbatt(&c->bbatt, bbatt))
48 			continue;
49 		if (!b43_compare_rfatt(&c->rfatt, rfatt))
50 			continue;
51 		return c;
52 	}
53 
54 	return NULL;
55 }
56 
57 /* Write the LocalOscillator Control (adjust) value-pair. */
58 static void b43_lo_write(struct b43_wldev *dev, struct b43_loctl *control)
59 {
60 	struct b43_phy *phy = &dev->phy;
61 	u16 value;
62 
63 	if (B43_DEBUG) {
64 		if (unlikely(abs(control->i) > 16 || abs(control->q) > 16)) {
65 			b43dbg(dev->wl, "Invalid LO control pair "
66 			       "(I: %d, Q: %d)\n", control->i, control->q);
67 			dump_stack();
68 			return;
69 		}
70 	}
71 	B43_WARN_ON(phy->type != B43_PHYTYPE_G);
72 
73 	value = (u8) (control->q);
74 	value |= ((u8) (control->i)) << 8;
75 	b43_phy_write(dev, B43_PHY_LO_CTL, value);
76 }
77 
78 static u16 lo_measure_feedthrough(struct b43_wldev *dev,
79 				  u16 lna, u16 pga, u16 trsw_rx)
80 {
81 	struct b43_phy *phy = &dev->phy;
82 	u16 rfover;
83 	u16 feedthrough;
84 
85 	if (phy->gmode) {
86 		lna <<= B43_PHY_RFOVERVAL_LNA_SHIFT;
87 		pga <<= B43_PHY_RFOVERVAL_PGA_SHIFT;
88 
89 		B43_WARN_ON(lna & ~B43_PHY_RFOVERVAL_LNA);
90 		B43_WARN_ON(pga & ~B43_PHY_RFOVERVAL_PGA);
91 /*FIXME This assertion fails		B43_WARN_ON(trsw_rx & ~(B43_PHY_RFOVERVAL_TRSWRX |
92 				    B43_PHY_RFOVERVAL_BW));
93 */
94 		trsw_rx &= (B43_PHY_RFOVERVAL_TRSWRX | B43_PHY_RFOVERVAL_BW);
95 
96 		/* Construct the RF Override Value */
97 		rfover = B43_PHY_RFOVERVAL_UNK;
98 		rfover |= pga;
99 		rfover |= lna;
100 		rfover |= trsw_rx;
101 		if ((dev->dev->bus_sprom->boardflags_lo & B43_BFL_EXTLNA)
102 		    && phy->rev > 6)
103 			rfover |= B43_PHY_RFOVERVAL_EXTLNA;
104 
105 		b43_phy_write(dev, B43_PHY_PGACTL, 0xE300);
106 		b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
107 		udelay(10);
108 		rfover |= B43_PHY_RFOVERVAL_BW_LBW;
109 		b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
110 		udelay(10);
111 		rfover |= B43_PHY_RFOVERVAL_BW_LPF;
112 		b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
113 		udelay(10);
114 		b43_phy_write(dev, B43_PHY_PGACTL, 0xF300);
115 	} else {
116 		pga |= B43_PHY_PGACTL_UNKNOWN;
117 		b43_phy_write(dev, B43_PHY_PGACTL, pga);
118 		udelay(10);
119 		pga |= B43_PHY_PGACTL_LOWBANDW;
120 		b43_phy_write(dev, B43_PHY_PGACTL, pga);
121 		udelay(10);
122 		pga |= B43_PHY_PGACTL_LPF;
123 		b43_phy_write(dev, B43_PHY_PGACTL, pga);
124 	}
125 	udelay(21);
126 	feedthrough = b43_phy_read(dev, B43_PHY_LO_LEAKAGE);
127 
128 	/* This is a good place to check if we need to relax a bit,
129 	 * as this is the main function called regularly
130 	 * in the LO calibration. */
131 	cond_resched();
132 
133 	return feedthrough;
134 }
135 
136 /* TXCTL Register and Value Table.
137  * Returns the "TXCTL Register".
138  * "value" is the "TXCTL Value".
139  * "pad_mix_gain" is the PAD Mixer Gain.
140  */
141 static u16 lo_txctl_register_table(struct b43_wldev *dev,
142 				   u16 *value, u16 *pad_mix_gain)
143 {
144 	struct b43_phy *phy = &dev->phy;
145 	u16 reg, v, padmix;
146 
147 	if (phy->type == B43_PHYTYPE_B) {
148 		v = 0x30;
149 		if (phy->radio_rev <= 5) {
150 			reg = 0x43;
151 			padmix = 0;
152 		} else {
153 			reg = 0x52;
154 			padmix = 5;
155 		}
156 	} else {
157 		if (phy->rev >= 2 && phy->radio_rev == 8) {
158 			reg = 0x43;
159 			v = 0x10;
160 			padmix = 2;
161 		} else {
162 			reg = 0x52;
163 			v = 0x30;
164 			padmix = 5;
165 		}
166 	}
167 	if (value)
168 		*value = v;
169 	if (pad_mix_gain)
170 		*pad_mix_gain = padmix;
171 
172 	return reg;
173 }
174 
175 static void lo_measure_txctl_values(struct b43_wldev *dev)
176 {
177 	struct b43_phy *phy = &dev->phy;
178 	struct b43_phy_g *gphy = phy->g;
179 	struct b43_txpower_lo_control *lo = gphy->lo_control;
180 	u16 reg, mask;
181 	u16 trsw_rx, pga;
182 	u16 radio_pctl_reg;
183 
184 	static const u8 tx_bias_values[] = {
185 		0x09, 0x08, 0x0A, 0x01, 0x00,
186 		0x02, 0x05, 0x04, 0x06,
187 	};
188 	static const u8 tx_magn_values[] = {
189 		0x70, 0x40,
190 	};
191 
192 	if (!has_loopback_gain(phy)) {
193 		radio_pctl_reg = 6;
194 		trsw_rx = 2;
195 		pga = 0;
196 	} else {
197 		int lb_gain;	/* Loopback gain (in dB) */
198 
199 		trsw_rx = 0;
200 		lb_gain = gphy->max_lb_gain / 2;
201 		if (lb_gain > 10) {
202 			radio_pctl_reg = 0;
203 			pga = abs(10 - lb_gain) / 6;
204 			pga = clamp_val(pga, 0, 15);
205 		} else {
206 			int cmp_val;
207 			int tmp;
208 
209 			pga = 0;
210 			cmp_val = 0x24;
211 			if ((phy->rev >= 2) &&
212 			    (phy->radio_ver == 0x2050) && (phy->radio_rev == 8))
213 				cmp_val = 0x3C;
214 			tmp = lb_gain;
215 			if ((10 - lb_gain) < cmp_val)
216 				tmp = (10 - lb_gain);
217 			if (tmp < 0)
218 				tmp += 6;
219 			else
220 				tmp += 3;
221 			cmp_val /= 4;
222 			tmp /= 4;
223 			if (tmp >= cmp_val)
224 				radio_pctl_reg = cmp_val;
225 			else
226 				radio_pctl_reg = tmp;
227 		}
228 	}
229 	b43_radio_maskset(dev, 0x43, 0xFFF0, radio_pctl_reg);
230 	b43_gphy_set_baseband_attenuation(dev, 2);
231 
232 	reg = lo_txctl_register_table(dev, &mask, NULL);
233 	mask = ~mask;
234 	b43_radio_mask(dev, reg, mask);
235 
236 	if (has_tx_magnification(phy)) {
237 		int i, j;
238 		int feedthrough;
239 		int min_feedth = 0xFFFF;
240 		u8 tx_magn, tx_bias;
241 
242 		for (i = 0; i < ARRAY_SIZE(tx_magn_values); i++) {
243 			tx_magn = tx_magn_values[i];
244 			b43_radio_maskset(dev, 0x52, 0xFF0F, tx_magn);
245 			for (j = 0; j < ARRAY_SIZE(tx_bias_values); j++) {
246 				tx_bias = tx_bias_values[j];
247 				b43_radio_maskset(dev, 0x52, 0xFFF0, tx_bias);
248 				feedthrough =
249 				    lo_measure_feedthrough(dev, 0, pga,
250 							   trsw_rx);
251 				if (feedthrough < min_feedth) {
252 					lo->tx_bias = tx_bias;
253 					lo->tx_magn = tx_magn;
254 					min_feedth = feedthrough;
255 				}
256 				if (lo->tx_bias == 0)
257 					break;
258 			}
259 			b43_radio_write16(dev, 0x52,
260 					  (b43_radio_read16(dev, 0x52)
261 					   & 0xFF00) | lo->tx_bias | lo->
262 					  tx_magn);
263 		}
264 	} else {
265 		lo->tx_magn = 0;
266 		lo->tx_bias = 0;
267 		b43_radio_mask(dev, 0x52, 0xFFF0);	/* TX bias == 0 */
268 	}
269 	lo->txctl_measured_time = jiffies;
270 }
271 
272 static void lo_read_power_vector(struct b43_wldev *dev)
273 {
274 	struct b43_phy *phy = &dev->phy;
275 	struct b43_phy_g *gphy = phy->g;
276 	struct b43_txpower_lo_control *lo = gphy->lo_control;
277 	int i;
278 	u64 tmp;
279 	u64 power_vector = 0;
280 
281 	for (i = 0; i < 8; i += 2) {
282 		tmp = b43_shm_read16(dev, B43_SHM_SHARED, 0x310 + i);
283 		power_vector |= (tmp << (i * 8));
284 		/* Clear the vector on the device. */
285 		b43_shm_write16(dev, B43_SHM_SHARED, 0x310 + i, 0);
286 	}
287 	if (power_vector)
288 		lo->power_vector = power_vector;
289 	lo->pwr_vec_read_time = jiffies;
290 }
291 
292 /* 802.11/LO/GPHY/MeasuringGains */
293 static void lo_measure_gain_values(struct b43_wldev *dev,
294 				   s16 max_rx_gain, int use_trsw_rx)
295 {
296 	struct b43_phy *phy = &dev->phy;
297 	struct b43_phy_g *gphy = phy->g;
298 	u16 tmp;
299 
300 	if (max_rx_gain < 0)
301 		max_rx_gain = 0;
302 
303 	if (has_loopback_gain(phy)) {
304 		int trsw_rx_gain;
305 
306 		if (use_trsw_rx) {
307 			trsw_rx_gain = gphy->trsw_rx_gain / 2;
308 			if (max_rx_gain >= trsw_rx_gain) {
309 				trsw_rx_gain = max_rx_gain - trsw_rx_gain;
310 			}
311 		} else
312 			trsw_rx_gain = max_rx_gain;
313 		if (trsw_rx_gain < 9) {
314 			gphy->lna_lod_gain = 0;
315 		} else {
316 			gphy->lna_lod_gain = 1;
317 			trsw_rx_gain -= 8;
318 		}
319 		trsw_rx_gain = clamp_val(trsw_rx_gain, 0, 0x2D);
320 		gphy->pga_gain = trsw_rx_gain / 3;
321 		if (gphy->pga_gain >= 5) {
322 			gphy->pga_gain -= 5;
323 			gphy->lna_gain = 2;
324 		} else
325 			gphy->lna_gain = 0;
326 	} else {
327 		gphy->lna_gain = 0;
328 		gphy->trsw_rx_gain = 0x20;
329 		if (max_rx_gain >= 0x14) {
330 			gphy->lna_lod_gain = 1;
331 			gphy->pga_gain = 2;
332 		} else if (max_rx_gain >= 0x12) {
333 			gphy->lna_lod_gain = 1;
334 			gphy->pga_gain = 1;
335 		} else if (max_rx_gain >= 0xF) {
336 			gphy->lna_lod_gain = 1;
337 			gphy->pga_gain = 0;
338 		} else {
339 			gphy->lna_lod_gain = 0;
340 			gphy->pga_gain = 0;
341 		}
342 	}
343 
344 	tmp = b43_radio_read16(dev, 0x7A);
345 	if (gphy->lna_lod_gain == 0)
346 		tmp &= ~0x0008;
347 	else
348 		tmp |= 0x0008;
349 	b43_radio_write16(dev, 0x7A, tmp);
350 }
351 
352 struct lo_g_saved_values {
353 	u8 old_channel;
354 
355 	/* Core registers */
356 	u16 reg_3F4;
357 	u16 reg_3E2;
358 
359 	/* PHY registers */
360 	u16 phy_lo_mask;
361 	u16 phy_extg_01;
362 	u16 phy_dacctl_hwpctl;
363 	u16 phy_dacctl;
364 	u16 phy_cck_14;
365 	u16 phy_hpwr_tssictl;
366 	u16 phy_analogover;
367 	u16 phy_analogoverval;
368 	u16 phy_rfover;
369 	u16 phy_rfoverval;
370 	u16 phy_classctl;
371 	u16 phy_cck_3E;
372 	u16 phy_crs0;
373 	u16 phy_pgactl;
374 	u16 phy_cck_2A;
375 	u16 phy_syncctl;
376 	u16 phy_cck_30;
377 	u16 phy_cck_06;
378 
379 	/* Radio registers */
380 	u16 radio_43;
381 	u16 radio_7A;
382 	u16 radio_52;
383 };
384 
385 static void lo_measure_setup(struct b43_wldev *dev,
386 			     struct lo_g_saved_values *sav)
387 {
388 	struct ssb_sprom *sprom = dev->dev->bus_sprom;
389 	struct b43_phy *phy = &dev->phy;
390 	struct b43_phy_g *gphy = phy->g;
391 	struct b43_txpower_lo_control *lo = gphy->lo_control;
392 	u16 tmp;
393 
394 	if (b43_has_hardware_pctl(dev)) {
395 		sav->phy_lo_mask = b43_phy_read(dev, B43_PHY_LO_MASK);
396 		sav->phy_extg_01 = b43_phy_read(dev, B43_PHY_EXTG(0x01));
397 		sav->phy_dacctl_hwpctl = b43_phy_read(dev, B43_PHY_DACCTL);
398 		sav->phy_cck_14 = b43_phy_read(dev, B43_PHY_CCK(0x14));
399 		sav->phy_hpwr_tssictl = b43_phy_read(dev, B43_PHY_HPWR_TSSICTL);
400 
401 		b43_phy_set(dev, B43_PHY_HPWR_TSSICTL, 0x100);
402 		b43_phy_set(dev, B43_PHY_EXTG(0x01), 0x40);
403 		b43_phy_set(dev, B43_PHY_DACCTL, 0x40);
404 		b43_phy_set(dev, B43_PHY_CCK(0x14), 0x200);
405 	}
406 	if (phy->type == B43_PHYTYPE_B &&
407 	    phy->radio_ver == 0x2050 && phy->radio_rev < 6) {
408 		b43_phy_write(dev, B43_PHY_CCK(0x16), 0x410);
409 		b43_phy_write(dev, B43_PHY_CCK(0x17), 0x820);
410 	}
411 	if (phy->rev >= 2) {
412 		sav->phy_analogover = b43_phy_read(dev, B43_PHY_ANALOGOVER);
413 		sav->phy_analogoverval =
414 		    b43_phy_read(dev, B43_PHY_ANALOGOVERVAL);
415 		sav->phy_rfover = b43_phy_read(dev, B43_PHY_RFOVER);
416 		sav->phy_rfoverval = b43_phy_read(dev, B43_PHY_RFOVERVAL);
417 		sav->phy_classctl = b43_phy_read(dev, B43_PHY_CLASSCTL);
418 		sav->phy_cck_3E = b43_phy_read(dev, B43_PHY_CCK(0x3E));
419 		sav->phy_crs0 = b43_phy_read(dev, B43_PHY_CRS0);
420 
421 		b43_phy_mask(dev, B43_PHY_CLASSCTL, 0xFFFC);
422 		b43_phy_mask(dev, B43_PHY_CRS0, 0x7FFF);
423 		b43_phy_set(dev, B43_PHY_ANALOGOVER, 0x0003);
424 		b43_phy_mask(dev, B43_PHY_ANALOGOVERVAL, 0xFFFC);
425 		if (phy->type == B43_PHYTYPE_G) {
426 			if ((phy->rev >= 7) &&
427 			    (sprom->boardflags_lo & B43_BFL_EXTLNA)) {
428 				b43_phy_write(dev, B43_PHY_RFOVER, 0x933);
429 			} else {
430 				b43_phy_write(dev, B43_PHY_RFOVER, 0x133);
431 			}
432 		} else {
433 			b43_phy_write(dev, B43_PHY_RFOVER, 0);
434 		}
435 		b43_phy_write(dev, B43_PHY_CCK(0x3E), 0);
436 	}
437 	sav->reg_3F4 = b43_read16(dev, 0x3F4);
438 	sav->reg_3E2 = b43_read16(dev, 0x3E2);
439 	sav->radio_43 = b43_radio_read16(dev, 0x43);
440 	sav->radio_7A = b43_radio_read16(dev, 0x7A);
441 	sav->phy_pgactl = b43_phy_read(dev, B43_PHY_PGACTL);
442 	sav->phy_cck_2A = b43_phy_read(dev, B43_PHY_CCK(0x2A));
443 	sav->phy_syncctl = b43_phy_read(dev, B43_PHY_SYNCCTL);
444 	sav->phy_dacctl = b43_phy_read(dev, B43_PHY_DACCTL);
445 
446 	if (!has_tx_magnification(phy)) {
447 		sav->radio_52 = b43_radio_read16(dev, 0x52);
448 		sav->radio_52 &= 0x00F0;
449 	}
450 	if (phy->type == B43_PHYTYPE_B) {
451 		sav->phy_cck_30 = b43_phy_read(dev, B43_PHY_CCK(0x30));
452 		sav->phy_cck_06 = b43_phy_read(dev, B43_PHY_CCK(0x06));
453 		b43_phy_write(dev, B43_PHY_CCK(0x30), 0x00FF);
454 		b43_phy_write(dev, B43_PHY_CCK(0x06), 0x3F3F);
455 	} else {
456 		b43_write16(dev, 0x3E2, b43_read16(dev, 0x3E2)
457 			    | 0x8000);
458 	}
459 	b43_write16(dev, 0x3F4, b43_read16(dev, 0x3F4)
460 		    & 0xF000);
461 
462 	tmp =
463 	    (phy->type == B43_PHYTYPE_G) ? B43_PHY_LO_MASK : B43_PHY_CCK(0x2E);
464 	b43_phy_write(dev, tmp, 0x007F);
465 
466 	tmp = sav->phy_syncctl;
467 	b43_phy_write(dev, B43_PHY_SYNCCTL, tmp & 0xFF7F);
468 	tmp = sav->radio_7A;
469 	b43_radio_write16(dev, 0x007A, tmp & 0xFFF0);
470 
471 	b43_phy_write(dev, B43_PHY_CCK(0x2A), 0x8A3);
472 	if (phy->type == B43_PHYTYPE_G ||
473 	    (phy->type == B43_PHYTYPE_B &&
474 	     phy->radio_ver == 0x2050 && phy->radio_rev >= 6)) {
475 		b43_phy_write(dev, B43_PHY_CCK(0x2B), 0x1003);
476 	} else
477 		b43_phy_write(dev, B43_PHY_CCK(0x2B), 0x0802);
478 	if (phy->rev >= 2)
479 		b43_dummy_transmission(dev, false, true);
480 	b43_gphy_channel_switch(dev, 6, 0);
481 	b43_radio_read16(dev, 0x51);	/* dummy read */
482 	if (phy->type == B43_PHYTYPE_G)
483 		b43_phy_write(dev, B43_PHY_CCK(0x2F), 0);
484 
485 	/* Re-measure the txctl values, if needed. */
486 	if (time_before(lo->txctl_measured_time,
487 			jiffies - B43_LO_TXCTL_EXPIRE))
488 		lo_measure_txctl_values(dev);
489 
490 	if (phy->type == B43_PHYTYPE_G && phy->rev >= 3) {
491 		b43_phy_write(dev, B43_PHY_LO_MASK, 0xC078);
492 	} else {
493 		if (phy->type == B43_PHYTYPE_B)
494 			b43_phy_write(dev, B43_PHY_CCK(0x2E), 0x8078);
495 		else
496 			b43_phy_write(dev, B43_PHY_LO_MASK, 0x8078);
497 	}
498 }
499 
500 static void lo_measure_restore(struct b43_wldev *dev,
501 			       struct lo_g_saved_values *sav)
502 {
503 	struct b43_phy *phy = &dev->phy;
504 	struct b43_phy_g *gphy = phy->g;
505 	u16 tmp;
506 
507 	if (phy->rev >= 2) {
508 		b43_phy_write(dev, B43_PHY_PGACTL, 0xE300);
509 		tmp = (gphy->pga_gain << 8);
510 		b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA0);
511 		udelay(5);
512 		b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA2);
513 		udelay(2);
514 		b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA3);
515 	} else {
516 		tmp = (gphy->pga_gain | 0xEFA0);
517 		b43_phy_write(dev, B43_PHY_PGACTL, tmp);
518 	}
519 	if (phy->type == B43_PHYTYPE_G) {
520 		if (phy->rev >= 3)
521 			b43_phy_write(dev, B43_PHY_CCK(0x2E), 0xC078);
522 		else
523 			b43_phy_write(dev, B43_PHY_CCK(0x2E), 0x8078);
524 		if (phy->rev >= 2)
525 			b43_phy_write(dev, B43_PHY_CCK(0x2F), 0x0202);
526 		else
527 			b43_phy_write(dev, B43_PHY_CCK(0x2F), 0x0101);
528 	}
529 	b43_write16(dev, 0x3F4, sav->reg_3F4);
530 	b43_phy_write(dev, B43_PHY_PGACTL, sav->phy_pgactl);
531 	b43_phy_write(dev, B43_PHY_CCK(0x2A), sav->phy_cck_2A);
532 	b43_phy_write(dev, B43_PHY_SYNCCTL, sav->phy_syncctl);
533 	b43_phy_write(dev, B43_PHY_DACCTL, sav->phy_dacctl);
534 	b43_radio_write16(dev, 0x43, sav->radio_43);
535 	b43_radio_write16(dev, 0x7A, sav->radio_7A);
536 	if (!has_tx_magnification(phy)) {
537 		tmp = sav->radio_52;
538 		b43_radio_maskset(dev, 0x52, 0xFF0F, tmp);
539 	}
540 	b43_write16(dev, 0x3E2, sav->reg_3E2);
541 	if (phy->type == B43_PHYTYPE_B &&
542 	    phy->radio_ver == 0x2050 && phy->radio_rev <= 5) {
543 		b43_phy_write(dev, B43_PHY_CCK(0x30), sav->phy_cck_30);
544 		b43_phy_write(dev, B43_PHY_CCK(0x06), sav->phy_cck_06);
545 	}
546 	if (phy->rev >= 2) {
547 		b43_phy_write(dev, B43_PHY_ANALOGOVER, sav->phy_analogover);
548 		b43_phy_write(dev, B43_PHY_ANALOGOVERVAL,
549 			      sav->phy_analogoverval);
550 		b43_phy_write(dev, B43_PHY_CLASSCTL, sav->phy_classctl);
551 		b43_phy_write(dev, B43_PHY_RFOVER, sav->phy_rfover);
552 		b43_phy_write(dev, B43_PHY_RFOVERVAL, sav->phy_rfoverval);
553 		b43_phy_write(dev, B43_PHY_CCK(0x3E), sav->phy_cck_3E);
554 		b43_phy_write(dev, B43_PHY_CRS0, sav->phy_crs0);
555 	}
556 	if (b43_has_hardware_pctl(dev)) {
557 		tmp = (sav->phy_lo_mask & 0xBFFF);
558 		b43_phy_write(dev, B43_PHY_LO_MASK, tmp);
559 		b43_phy_write(dev, B43_PHY_EXTG(0x01), sav->phy_extg_01);
560 		b43_phy_write(dev, B43_PHY_DACCTL, sav->phy_dacctl_hwpctl);
561 		b43_phy_write(dev, B43_PHY_CCK(0x14), sav->phy_cck_14);
562 		b43_phy_write(dev, B43_PHY_HPWR_TSSICTL, sav->phy_hpwr_tssictl);
563 	}
564 	b43_gphy_channel_switch(dev, sav->old_channel, 1);
565 }
566 
567 struct b43_lo_g_statemachine {
568 	int current_state;
569 	int nr_measured;
570 	int state_val_multiplier;
571 	u16 lowest_feedth;
572 	struct b43_loctl min_loctl;
573 };
574 
575 /* Loop over each possible value in this state. */
576 static int lo_probe_possible_loctls(struct b43_wldev *dev,
577 				    struct b43_loctl *probe_loctl,
578 				    struct b43_lo_g_statemachine *d)
579 {
580 	struct b43_phy *phy = &dev->phy;
581 	struct b43_phy_g *gphy = phy->g;
582 	struct b43_loctl test_loctl;
583 	struct b43_loctl orig_loctl;
584 	struct b43_loctl prev_loctl = {
585 		.i = -100,
586 		.q = -100,
587 	};
588 	int i;
589 	int begin, end;
590 	int found_lower = 0;
591 	u16 feedth;
592 
593 	static const struct b43_loctl modifiers[] = {
594 		{.i = 1,.q = 1,},
595 		{.i = 1,.q = 0,},
596 		{.i = 1,.q = -1,},
597 		{.i = 0,.q = -1,},
598 		{.i = -1,.q = -1,},
599 		{.i = -1,.q = 0,},
600 		{.i = -1,.q = 1,},
601 		{.i = 0,.q = 1,},
602 	};
603 
604 	if (d->current_state == 0) {
605 		begin = 1;
606 		end = 8;
607 	} else if (d->current_state % 2 == 0) {
608 		begin = d->current_state - 1;
609 		end = d->current_state + 1;
610 	} else {
611 		begin = d->current_state - 2;
612 		end = d->current_state + 2;
613 	}
614 	if (begin < 1)
615 		begin += 8;
616 	if (end > 8)
617 		end -= 8;
618 
619 	memcpy(&orig_loctl, probe_loctl, sizeof(struct b43_loctl));
620 	i = begin;
621 	d->current_state = i;
622 	while (1) {
623 		B43_WARN_ON(!(i >= 1 && i <= 8));
624 		memcpy(&test_loctl, &orig_loctl, sizeof(struct b43_loctl));
625 		test_loctl.i += modifiers[i - 1].i * d->state_val_multiplier;
626 		test_loctl.q += modifiers[i - 1].q * d->state_val_multiplier;
627 		if ((test_loctl.i != prev_loctl.i ||
628 		     test_loctl.q != prev_loctl.q) &&
629 		    (abs(test_loctl.i) <= 16 && abs(test_loctl.q) <= 16)) {
630 			b43_lo_write(dev, &test_loctl);
631 			feedth = lo_measure_feedthrough(dev, gphy->lna_gain,
632 							gphy->pga_gain,
633 							gphy->trsw_rx_gain);
634 			if (feedth < d->lowest_feedth) {
635 				memcpy(probe_loctl, &test_loctl,
636 				       sizeof(struct b43_loctl));
637 				found_lower = 1;
638 				d->lowest_feedth = feedth;
639 				if ((d->nr_measured < 2) &&
640 				    !has_loopback_gain(phy))
641 					break;
642 			}
643 		}
644 		memcpy(&prev_loctl, &test_loctl, sizeof(prev_loctl));
645 		if (i == end)
646 			break;
647 		if (i == 8)
648 			i = 1;
649 		else
650 			i++;
651 		d->current_state = i;
652 	}
653 
654 	return found_lower;
655 }
656 
657 static void lo_probe_loctls_statemachine(struct b43_wldev *dev,
658 					 struct b43_loctl *loctl,
659 					 int *max_rx_gain)
660 {
661 	struct b43_phy *phy = &dev->phy;
662 	struct b43_phy_g *gphy = phy->g;
663 	struct b43_lo_g_statemachine d;
664 	u16 feedth;
665 	int found_lower;
666 	struct b43_loctl probe_loctl;
667 	int max_repeat = 1, repeat_cnt = 0;
668 
669 	d.nr_measured = 0;
670 	d.state_val_multiplier = 1;
671 	if (has_loopback_gain(phy))
672 		d.state_val_multiplier = 3;
673 
674 	memcpy(&d.min_loctl, loctl, sizeof(struct b43_loctl));
675 	if (has_loopback_gain(phy))
676 		max_repeat = 4;
677 	do {
678 		b43_lo_write(dev, &d.min_loctl);
679 		feedth = lo_measure_feedthrough(dev, gphy->lna_gain,
680 						gphy->pga_gain,
681 						gphy->trsw_rx_gain);
682 		if (feedth < 0x258) {
683 			if (feedth >= 0x12C)
684 				*max_rx_gain += 6;
685 			else
686 				*max_rx_gain += 3;
687 			feedth = lo_measure_feedthrough(dev, gphy->lna_gain,
688 							gphy->pga_gain,
689 							gphy->trsw_rx_gain);
690 		}
691 		d.lowest_feedth = feedth;
692 
693 		d.current_state = 0;
694 		do {
695 			B43_WARN_ON(!
696 				    (d.current_state >= 0
697 				     && d.current_state <= 8));
698 			memcpy(&probe_loctl, &d.min_loctl,
699 			       sizeof(struct b43_loctl));
700 			found_lower =
701 			    lo_probe_possible_loctls(dev, &probe_loctl, &d);
702 			if (!found_lower)
703 				break;
704 			if ((probe_loctl.i == d.min_loctl.i) &&
705 			    (probe_loctl.q == d.min_loctl.q))
706 				break;
707 			memcpy(&d.min_loctl, &probe_loctl,
708 			       sizeof(struct b43_loctl));
709 			d.nr_measured++;
710 		} while (d.nr_measured < 24);
711 		memcpy(loctl, &d.min_loctl, sizeof(struct b43_loctl));
712 
713 		if (has_loopback_gain(phy)) {
714 			if (d.lowest_feedth > 0x1194)
715 				*max_rx_gain -= 6;
716 			else if (d.lowest_feedth < 0x5DC)
717 				*max_rx_gain += 3;
718 			if (repeat_cnt == 0) {
719 				if (d.lowest_feedth <= 0x5DC) {
720 					d.state_val_multiplier = 1;
721 					repeat_cnt++;
722 				} else
723 					d.state_val_multiplier = 2;
724 			} else if (repeat_cnt == 2)
725 				d.state_val_multiplier = 1;
726 		}
727 		lo_measure_gain_values(dev, *max_rx_gain,
728 				       has_loopback_gain(phy));
729 	} while (++repeat_cnt < max_repeat);
730 }
731 
732 static
733 struct b43_lo_calib *b43_calibrate_lo_setting(struct b43_wldev *dev,
734 					      const struct b43_bbatt *bbatt,
735 					      const struct b43_rfatt *rfatt)
736 {
737 	struct b43_phy *phy = &dev->phy;
738 	struct b43_phy_g *gphy = phy->g;
739 	struct b43_loctl loctl = {
740 		.i = 0,
741 		.q = 0,
742 	};
743 	int max_rx_gain;
744 	struct b43_lo_calib *cal;
745 	struct lo_g_saved_values uninitialized_var(saved_regs);
746 	/* Values from the "TXCTL Register and Value Table" */
747 	u16 txctl_reg;
748 	u16 txctl_value;
749 	u16 pad_mix_gain;
750 
751 	saved_regs.old_channel = phy->channel;
752 	b43_mac_suspend(dev);
753 	lo_measure_setup(dev, &saved_regs);
754 
755 	txctl_reg = lo_txctl_register_table(dev, &txctl_value, &pad_mix_gain);
756 
757 	b43_radio_maskset(dev, 0x43, 0xFFF0, rfatt->att);
758 	b43_radio_maskset(dev, txctl_reg, ~txctl_value, (rfatt->with_padmix ? txctl_value :0));
759 
760 	max_rx_gain = rfatt->att * 2;
761 	max_rx_gain += bbatt->att / 2;
762 	if (rfatt->with_padmix)
763 		max_rx_gain -= pad_mix_gain;
764 	if (has_loopback_gain(phy))
765 		max_rx_gain += gphy->max_lb_gain;
766 	lo_measure_gain_values(dev, max_rx_gain,
767 			       has_loopback_gain(phy));
768 
769 	b43_gphy_set_baseband_attenuation(dev, bbatt->att);
770 	lo_probe_loctls_statemachine(dev, &loctl, &max_rx_gain);
771 
772 	lo_measure_restore(dev, &saved_regs);
773 	b43_mac_enable(dev);
774 
775 	if (b43_debug(dev, B43_DBG_LO)) {
776 		b43dbg(dev->wl, "LO: Calibrated for BB(%u), RF(%u,%u) "
777 		       "=> I=%d Q=%d\n",
778 		       bbatt->att, rfatt->att, rfatt->with_padmix,
779 		       loctl.i, loctl.q);
780 	}
781 
782 	cal = kmalloc(sizeof(*cal), GFP_KERNEL);
783 	if (!cal) {
784 		b43warn(dev->wl, "LO calib: out of memory\n");
785 		return NULL;
786 	}
787 	memcpy(&cal->bbatt, bbatt, sizeof(*bbatt));
788 	memcpy(&cal->rfatt, rfatt, sizeof(*rfatt));
789 	memcpy(&cal->ctl, &loctl, sizeof(loctl));
790 	cal->calib_time = jiffies;
791 	INIT_LIST_HEAD(&cal->list);
792 
793 	return cal;
794 }
795 
796 /* Get a calibrated LO setting for the given attenuation values.
797  * Might return a NULL pointer under OOM! */
798 static
799 struct b43_lo_calib *b43_get_calib_lo_settings(struct b43_wldev *dev,
800 					       const struct b43_bbatt *bbatt,
801 					       const struct b43_rfatt *rfatt)
802 {
803 	struct b43_txpower_lo_control *lo = dev->phy.g->lo_control;
804 	struct b43_lo_calib *c;
805 
806 	c = b43_find_lo_calib(lo, bbatt, rfatt);
807 	if (c)
808 		return c;
809 	/* Not in the list of calibrated LO settings.
810 	 * Calibrate it now. */
811 	c = b43_calibrate_lo_setting(dev, bbatt, rfatt);
812 	if (!c)
813 		return NULL;
814 	list_add(&c->list, &lo->calib_list);
815 
816 	return c;
817 }
818 
819 void b43_gphy_dc_lt_init(struct b43_wldev *dev, bool update_all)
820 {
821 	struct b43_phy *phy = &dev->phy;
822 	struct b43_phy_g *gphy = phy->g;
823 	struct b43_txpower_lo_control *lo = gphy->lo_control;
824 	int i;
825 	int rf_offset, bb_offset;
826 	const struct b43_rfatt *rfatt;
827 	const struct b43_bbatt *bbatt;
828 	u64 power_vector;
829 	bool table_changed = false;
830 
831 	BUILD_BUG_ON(B43_DC_LT_SIZE != 32);
832 	B43_WARN_ON(lo->rfatt_list.len * lo->bbatt_list.len > 64);
833 
834 	power_vector = lo->power_vector;
835 	if (!update_all && !power_vector)
836 		return; /* Nothing to do. */
837 
838 	/* Suspend the MAC now to avoid continuous suspend/enable
839 	 * cycles in the loop. */
840 	b43_mac_suspend(dev);
841 
842 	for (i = 0; i < B43_DC_LT_SIZE * 2; i++) {
843 		struct b43_lo_calib *cal;
844 		int idx;
845 		u16 val;
846 
847 		if (!update_all && !(power_vector & (((u64)1ULL) << i)))
848 			continue;
849 		/* Update the table entry for this power_vector bit.
850 		 * The table rows are RFatt entries and columns are BBatt. */
851 		bb_offset = i / lo->rfatt_list.len;
852 		rf_offset = i % lo->rfatt_list.len;
853 		bbatt = &(lo->bbatt_list.list[bb_offset]);
854 		rfatt = &(lo->rfatt_list.list[rf_offset]);
855 
856 		cal = b43_calibrate_lo_setting(dev, bbatt, rfatt);
857 		if (!cal) {
858 			b43warn(dev->wl, "LO: Could not "
859 				"calibrate DC table entry\n");
860 			continue;
861 		}
862 		/*FIXME: Is Q really in the low nibble? */
863 		val = (u8)(cal->ctl.q);
864 		val |= ((u8)(cal->ctl.i)) << 4;
865 		kfree(cal);
866 
867 		/* Get the index into the hardware DC LT. */
868 		idx = i / 2;
869 		/* Change the table in memory. */
870 		if (i % 2) {
871 			/* Change the high byte. */
872 			lo->dc_lt[idx] = (lo->dc_lt[idx] & 0x00FF)
873 					 | ((val & 0x00FF) << 8);
874 		} else {
875 			/* Change the low byte. */
876 			lo->dc_lt[idx] = (lo->dc_lt[idx] & 0xFF00)
877 					 | (val & 0x00FF);
878 		}
879 		table_changed = true;
880 	}
881 	if (table_changed) {
882 		/* The table changed in memory. Update the hardware table. */
883 		for (i = 0; i < B43_DC_LT_SIZE; i++)
884 			b43_phy_write(dev, 0x3A0 + i, lo->dc_lt[i]);
885 	}
886 	b43_mac_enable(dev);
887 }
888 
889 /* Fixup the RF attenuation value for the case where we are
890  * using the PAD mixer. */
891 static inline void b43_lo_fixup_rfatt(struct b43_rfatt *rf)
892 {
893 	if (!rf->with_padmix)
894 		return;
895 	if ((rf->att != 1) && (rf->att != 2) && (rf->att != 3))
896 		rf->att = 4;
897 }
898 
899 void b43_lo_g_adjust(struct b43_wldev *dev)
900 {
901 	struct b43_phy_g *gphy = dev->phy.g;
902 	struct b43_lo_calib *cal;
903 	struct b43_rfatt rf;
904 
905 	memcpy(&rf, &gphy->rfatt, sizeof(rf));
906 	b43_lo_fixup_rfatt(&rf);
907 
908 	cal = b43_get_calib_lo_settings(dev, &gphy->bbatt, &rf);
909 	if (!cal)
910 		return;
911 	b43_lo_write(dev, &cal->ctl);
912 }
913 
914 void b43_lo_g_adjust_to(struct b43_wldev *dev,
915 			u16 rfatt, u16 bbatt, u16 tx_control)
916 {
917 	struct b43_rfatt rf;
918 	struct b43_bbatt bb;
919 	struct b43_lo_calib *cal;
920 
921 	memset(&rf, 0, sizeof(rf));
922 	memset(&bb, 0, sizeof(bb));
923 	rf.att = rfatt;
924 	bb.att = bbatt;
925 	b43_lo_fixup_rfatt(&rf);
926 	cal = b43_get_calib_lo_settings(dev, &bb, &rf);
927 	if (!cal)
928 		return;
929 	b43_lo_write(dev, &cal->ctl);
930 }
931 
932 /* Periodic LO maintenance work */
933 void b43_lo_g_maintenance_work(struct b43_wldev *dev)
934 {
935 	struct b43_phy *phy = &dev->phy;
936 	struct b43_phy_g *gphy = phy->g;
937 	struct b43_txpower_lo_control *lo = gphy->lo_control;
938 	unsigned long now;
939 	unsigned long expire;
940 	struct b43_lo_calib *cal, *tmp;
941 	bool current_item_expired = false;
942 	bool hwpctl;
943 
944 	if (!lo)
945 		return;
946 	now = jiffies;
947 	hwpctl = b43_has_hardware_pctl(dev);
948 
949 	if (hwpctl) {
950 		/* Read the power vector and update it, if needed. */
951 		expire = now - B43_LO_PWRVEC_EXPIRE;
952 		if (time_before(lo->pwr_vec_read_time, expire)) {
953 			lo_read_power_vector(dev);
954 			b43_gphy_dc_lt_init(dev, 0);
955 		}
956 		//FIXME Recalc the whole DC table from time to time?
957 	}
958 
959 	if (hwpctl)
960 		return;
961 	/* Search for expired LO settings. Remove them.
962 	 * Recalibrate the current setting, if expired. */
963 	expire = now - B43_LO_CALIB_EXPIRE;
964 	list_for_each_entry_safe(cal, tmp, &lo->calib_list, list) {
965 		if (!time_before(cal->calib_time, expire))
966 			continue;
967 		/* This item expired. */
968 		if (b43_compare_bbatt(&cal->bbatt, &gphy->bbatt) &&
969 		    b43_compare_rfatt(&cal->rfatt, &gphy->rfatt)) {
970 			B43_WARN_ON(current_item_expired);
971 			current_item_expired = true;
972 		}
973 		if (b43_debug(dev, B43_DBG_LO)) {
974 			b43dbg(dev->wl, "LO: Item BB(%u), RF(%u,%u), "
975 			       "I=%d, Q=%d expired\n",
976 			       cal->bbatt.att, cal->rfatt.att,
977 			       cal->rfatt.with_padmix,
978 			       cal->ctl.i, cal->ctl.q);
979 		}
980 		list_del(&cal->list);
981 		kfree(cal);
982 	}
983 	if (current_item_expired || unlikely(list_empty(&lo->calib_list))) {
984 		/* Recalibrate currently used LO setting. */
985 		if (b43_debug(dev, B43_DBG_LO))
986 			b43dbg(dev->wl, "LO: Recalibrating current LO setting\n");
987 		cal = b43_calibrate_lo_setting(dev, &gphy->bbatt, &gphy->rfatt);
988 		if (cal) {
989 			list_add(&cal->list, &lo->calib_list);
990 			b43_lo_write(dev, &cal->ctl);
991 		} else
992 			b43warn(dev->wl, "Failed to recalibrate current LO setting\n");
993 	}
994 }
995 
996 void b43_lo_g_cleanup(struct b43_wldev *dev)
997 {
998 	struct b43_txpower_lo_control *lo = dev->phy.g->lo_control;
999 	struct b43_lo_calib *cal, *tmp;
1000 
1001 	if (!lo)
1002 		return;
1003 	list_for_each_entry_safe(cal, tmp, &lo->calib_list, list) {
1004 		list_del(&cal->list);
1005 		kfree(cal);
1006 	}
1007 }
1008 
1009 /* LO Initialization */
1010 void b43_lo_g_init(struct b43_wldev *dev)
1011 {
1012 	if (b43_has_hardware_pctl(dev)) {
1013 		lo_read_power_vector(dev);
1014 		b43_gphy_dc_lt_init(dev, 1);
1015 	}
1016 }
1017