Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / drivers / net / wireless / b43 / lo.c
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 <mb@bu3sch.de>
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 = 0;
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 = 1;
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 maintanance work */
933 void b43_lo_g_maintanance_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 = 0;
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 = 1;
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 }