1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3
   4  Broadcom B43 wireless driver
   5
   6  G PHY LO (LocalOscillator) Measuring and Control routines
   7
   8  Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
   9  Copyright (c) 2005, 2006 Stefano Brivio <stefano.brivio@polimi.it>
  10  Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
  11  Copyright (c) 2005, 2006 Danny van Dyk <kugelfang@gentoo.org>
  12  Copyright (c) 2005, 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch>
  13
  14
  15*/
  16
  17#include "b43.h"
  18#include "lo.h"
  19#include "phy_g.h"
  20#include "main.h"
  21
  22#include <linux/delay.h>
  23#include <linux/sched.h>
  24#include <linux/slab.h>
  25
  26
  27static struct b43_lo_calib *b43_find_lo_calib(struct b43_txpower_lo_control *lo,
  28					      const struct b43_bbatt *bbatt,
  29					       const struct b43_rfatt *rfatt)
  30{
  31	struct b43_lo_calib *c;
  32
  33	list_for_each_entry(c, &lo->calib_list, list) {
  34		if (!b43_compare_bbatt(&c->bbatt, bbatt))
  35			continue;
  36		if (!b43_compare_rfatt(&c->rfatt, rfatt))
  37			continue;
  38		return c;
  39	}
  40
  41	return NULL;
  42}
  43
  44/* Write the LocalOscillator Control (adjust) value-pair. */
  45static void b43_lo_write(struct b43_wldev *dev, struct b43_loctl *control)
  46{
  47	struct b43_phy *phy = &dev->phy;
  48	u16 value;
  49
  50	if (B43_DEBUG) {
  51		if (unlikely(abs(control->i) > 16 || abs(control->q) > 16)) {
  52			b43dbg(dev->wl, "Invalid LO control pair "
  53			       "(I: %d, Q: %d)\n", control->i, control->q);
  54			dump_stack();
  55			return;
  56		}
  57	}
  58	B43_WARN_ON(phy->type != B43_PHYTYPE_G);
  59
  60	value = (u8) (control->q);
  61	value |= ((u8) (control->i)) << 8;
  62	b43_phy_write(dev, B43_PHY_LO_CTL, value);
  63}
  64
  65static u16 lo_measure_feedthrough(struct b43_wldev *dev,
  66				  u16 lna, u16 pga, u16 trsw_rx)
  67{
  68	struct b43_phy *phy = &dev->phy;
  69	u16 rfover;
  70	u16 feedthrough;
  71
  72	if (phy->gmode) {
  73		lna <<= B43_PHY_RFOVERVAL_LNA_SHIFT;
  74		pga <<= B43_PHY_RFOVERVAL_PGA_SHIFT;
  75
  76		B43_WARN_ON(lna & ~B43_PHY_RFOVERVAL_LNA);
  77		B43_WARN_ON(pga & ~B43_PHY_RFOVERVAL_PGA);
  78/*FIXME This assertion fails		B43_WARN_ON(trsw_rx & ~(B43_PHY_RFOVERVAL_TRSWRX |
  79				    B43_PHY_RFOVERVAL_BW));
  80*/
  81		trsw_rx &= (B43_PHY_RFOVERVAL_TRSWRX | B43_PHY_RFOVERVAL_BW);
  82
  83		/* Construct the RF Override Value */
  84		rfover = B43_PHY_RFOVERVAL_UNK;
  85		rfover |= pga;
  86		rfover |= lna;
  87		rfover |= trsw_rx;
  88		if ((dev->dev->bus_sprom->boardflags_lo & B43_BFL_EXTLNA)
  89		    && phy->rev > 6)
  90			rfover |= B43_PHY_RFOVERVAL_EXTLNA;
  91
  92		b43_phy_write(dev, B43_PHY_PGACTL, 0xE300);
  93		b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
  94		udelay(10);
  95		rfover |= B43_PHY_RFOVERVAL_BW_LBW;
  96		b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
  97		udelay(10);
  98		rfover |= B43_PHY_RFOVERVAL_BW_LPF;
  99		b43_phy_write(dev, B43_PHY_RFOVERVAL, rfover);
 100		udelay(10);
 101		b43_phy_write(dev, B43_PHY_PGACTL, 0xF300);
 102	} else {
 103		pga |= B43_PHY_PGACTL_UNKNOWN;
 104		b43_phy_write(dev, B43_PHY_PGACTL, pga);
 105		udelay(10);
 106		pga |= B43_PHY_PGACTL_LOWBANDW;
 107		b43_phy_write(dev, B43_PHY_PGACTL, pga);
 108		udelay(10);
 109		pga |= B43_PHY_PGACTL_LPF;
 110		b43_phy_write(dev, B43_PHY_PGACTL, pga);
 111	}
 112	udelay(21);
 113	feedthrough = b43_phy_read(dev, B43_PHY_LO_LEAKAGE);
 114
 115	/* This is a good place to check if we need to relax a bit,
 116	 * as this is the main function called regularly
 117	 * in the LO calibration. */
 118	cond_resched();
 119
 120	return feedthrough;
 121}
 122
 123/* TXCTL Register and Value Table.
 124 * Returns the "TXCTL Register".
 125 * "value" is the "TXCTL Value".
 126 * "pad_mix_gain" is the PAD Mixer Gain.
 127 */
 128static u16 lo_txctl_register_table(struct b43_wldev *dev,
 129				   u16 *value, u16 *pad_mix_gain)
 130{
 131	struct b43_phy *phy = &dev->phy;
 132	u16 reg, v, padmix;
 133
 134	if (phy->type == B43_PHYTYPE_B) {
 135		v = 0x30;
 136		if (phy->radio_rev <= 5) {
 137			reg = 0x43;
 138			padmix = 0;
 139		} else {
 140			reg = 0x52;
 141			padmix = 5;
 142		}
 143	} else {
 144		if (phy->rev >= 2 && phy->radio_rev == 8) {
 145			reg = 0x43;
 146			v = 0x10;
 147			padmix = 2;
 148		} else {
 149			reg = 0x52;
 150			v = 0x30;
 151			padmix = 5;
 152		}
 153	}
 154	if (value)
 155		*value = v;
 156	if (pad_mix_gain)
 157		*pad_mix_gain = padmix;
 158
 159	return reg;
 160}
 161
 162static void lo_measure_txctl_values(struct b43_wldev *dev)
 163{
 164	struct b43_phy *phy = &dev->phy;
 165	struct b43_phy_g *gphy = phy->g;
 166	struct b43_txpower_lo_control *lo = gphy->lo_control;
 167	u16 reg, mask;
 168	u16 trsw_rx, pga;
 169	u16 radio_pctl_reg;
 170
 171	static const u8 tx_bias_values[] = {
 172		0x09, 0x08, 0x0A, 0x01, 0x00,
 173		0x02, 0x05, 0x04, 0x06,
 174	};
 175	static const u8 tx_magn_values[] = {
 176		0x70, 0x40,
 177	};
 178
 179	if (!has_loopback_gain(phy)) {
 180		radio_pctl_reg = 6;
 181		trsw_rx = 2;
 182		pga = 0;
 183	} else {
 184		int lb_gain;	/* Loopback gain (in dB) */
 185
 186		trsw_rx = 0;
 187		lb_gain = gphy->max_lb_gain / 2;
 188		if (lb_gain > 10) {
 189			radio_pctl_reg = 0;
 190			pga = abs(10 - lb_gain) / 6;
 191			pga = clamp_val(pga, 0, 15);
 192		} else {
 193			int cmp_val;
 194			int tmp;
 195
 196			pga = 0;
 197			cmp_val = 0x24;
 198			if ((phy->rev >= 2) &&
 199			    (phy->radio_ver == 0x2050) && (phy->radio_rev == 8))
 200				cmp_val = 0x3C;
 201			tmp = lb_gain;
 202			if ((10 - lb_gain) < cmp_val)
 203				tmp = (10 - lb_gain);
 204			if (tmp < 0)
 205				tmp += 6;
 206			else
 207				tmp += 3;
 208			cmp_val /= 4;
 209			tmp /= 4;
 210			if (tmp >= cmp_val)
 211				radio_pctl_reg = cmp_val;
 212			else
 213				radio_pctl_reg = tmp;
 214		}
 215	}
 216	b43_radio_maskset(dev, 0x43, 0xFFF0, radio_pctl_reg);
 217	b43_gphy_set_baseband_attenuation(dev, 2);
 218
 219	reg = lo_txctl_register_table(dev, &mask, NULL);
 220	mask = ~mask;
 221	b43_radio_mask(dev, reg, mask);
 222
 223	if (has_tx_magnification(phy)) {
 224		int i, j;
 225		int feedthrough;
 226		int min_feedth = 0xFFFF;
 227		u8 tx_magn, tx_bias;
 228
 229		for (i = 0; i < ARRAY_SIZE(tx_magn_values); i++) {
 230			tx_magn = tx_magn_values[i];
 231			b43_radio_maskset(dev, 0x52, 0xFF0F, tx_magn);
 232			for (j = 0; j < ARRAY_SIZE(tx_bias_values); j++) {
 233				tx_bias = tx_bias_values[j];
 234				b43_radio_maskset(dev, 0x52, 0xFFF0, tx_bias);
 235				feedthrough =
 236				    lo_measure_feedthrough(dev, 0, pga,
 237							   trsw_rx);
 238				if (feedthrough < min_feedth) {
 239					lo->tx_bias = tx_bias;
 240					lo->tx_magn = tx_magn;
 241					min_feedth = feedthrough;
 242				}
 243				if (lo->tx_bias == 0)
 244					break;
 245			}
 246			b43_radio_write16(dev, 0x52,
 247					  (b43_radio_read16(dev, 0x52)
 248					   & 0xFF00) | lo->tx_bias | lo->
 249					  tx_magn);
 250		}
 251	} else {
 252		lo->tx_magn = 0;
 253		lo->tx_bias = 0;
 254		b43_radio_mask(dev, 0x52, 0xFFF0);	/* TX bias == 0 */
 255	}
 256	lo->txctl_measured_time = jiffies;
 257}
 258
 259static void lo_read_power_vector(struct b43_wldev *dev)
 260{
 261	struct b43_phy *phy = &dev->phy;
 262	struct b43_phy_g *gphy = phy->g;
 263	struct b43_txpower_lo_control *lo = gphy->lo_control;
 264	int i;
 265	u64 tmp;
 266	u64 power_vector = 0;
 267
 268	for (i = 0; i < 8; i += 2) {
 269		tmp = b43_shm_read16(dev, B43_SHM_SHARED, 0x310 + i);
 270		power_vector |= (tmp << (i * 8));
 271		/* Clear the vector on the device. */
 272		b43_shm_write16(dev, B43_SHM_SHARED, 0x310 + i, 0);
 273	}
 274	if (power_vector)
 275		lo->power_vector = power_vector;
 276	lo->pwr_vec_read_time = jiffies;
 277}
 278
 279/* 802.11/LO/GPHY/MeasuringGains */
 280static void lo_measure_gain_values(struct b43_wldev *dev,
 281				   s16 max_rx_gain, int use_trsw_rx)
 282{
 283	struct b43_phy *phy = &dev->phy;
 284	struct b43_phy_g *gphy = phy->g;
 285	u16 tmp;
 286
 287	if (max_rx_gain < 0)
 288		max_rx_gain = 0;
 289
 290	if (has_loopback_gain(phy)) {
 291		int trsw_rx_gain;
 292
 293		if (use_trsw_rx) {
 294			trsw_rx_gain = gphy->trsw_rx_gain / 2;
 295			if (max_rx_gain >= trsw_rx_gain) {
 296				trsw_rx_gain = max_rx_gain - trsw_rx_gain;
 297			}
 298		} else
 299			trsw_rx_gain = max_rx_gain;
 300		if (trsw_rx_gain < 9) {
 301			gphy->lna_lod_gain = 0;
 302		} else {
 303			gphy->lna_lod_gain = 1;
 304			trsw_rx_gain -= 8;
 305		}
 306		trsw_rx_gain = clamp_val(trsw_rx_gain, 0, 0x2D);
 307		gphy->pga_gain = trsw_rx_gain / 3;
 308		if (gphy->pga_gain >= 5) {
 309			gphy->pga_gain -= 5;
 310			gphy->lna_gain = 2;
 311		} else
 312			gphy->lna_gain = 0;
 313	} else {
 314		gphy->lna_gain = 0;
 315		gphy->trsw_rx_gain = 0x20;
 316		if (max_rx_gain >= 0x14) {
 317			gphy->lna_lod_gain = 1;
 318			gphy->pga_gain = 2;
 319		} else if (max_rx_gain >= 0x12) {
 320			gphy->lna_lod_gain = 1;
 321			gphy->pga_gain = 1;
 322		} else if (max_rx_gain >= 0xF) {
 323			gphy->lna_lod_gain = 1;
 324			gphy->pga_gain = 0;
 325		} else {
 326			gphy->lna_lod_gain = 0;
 327			gphy->pga_gain = 0;
 328		}
 329	}
 330
 331	tmp = b43_radio_read16(dev, 0x7A);
 332	if (gphy->lna_lod_gain == 0)
 333		tmp &= ~0x0008;
 334	else
 335		tmp |= 0x0008;
 336	b43_radio_write16(dev, 0x7A, tmp);
 337}
 338
 339struct lo_g_saved_values {
 340	u8 old_channel;
 341
 342	/* Core registers */
 343	u16 reg_3F4;
 344	u16 reg_3E2;
 345
 346	/* PHY registers */
 347	u16 phy_lo_mask;
 348	u16 phy_extg_01;
 349	u16 phy_dacctl_hwpctl;
 350	u16 phy_dacctl;
 351	u16 phy_cck_14;
 352	u16 phy_hpwr_tssictl;
 353	u16 phy_analogover;
 354	u16 phy_analogoverval;
 355	u16 phy_rfover;
 356	u16 phy_rfoverval;
 357	u16 phy_classctl;
 358	u16 phy_cck_3E;
 359	u16 phy_crs0;
 360	u16 phy_pgactl;
 361	u16 phy_cck_2A;
 362	u16 phy_syncctl;
 363	u16 phy_cck_30;
 364	u16 phy_cck_06;
 365
 366	/* Radio registers */
 367	u16 radio_43;
 368	u16 radio_7A;
 369	u16 radio_52;
 370};
 371
 372static void lo_measure_setup(struct b43_wldev *dev,
 373			     struct lo_g_saved_values *sav)
 374{
 375	struct ssb_sprom *sprom = dev->dev->bus_sprom;
 376	struct b43_phy *phy = &dev->phy;
 377	struct b43_phy_g *gphy = phy->g;
 378	struct b43_txpower_lo_control *lo = gphy->lo_control;
 379	u16 tmp;
 380
 381	if (b43_has_hardware_pctl(dev)) {
 382		sav->phy_lo_mask = b43_phy_read(dev, B43_PHY_LO_MASK);
 383		sav->phy_extg_01 = b43_phy_read(dev, B43_PHY_EXTG(0x01));
 384		sav->phy_dacctl_hwpctl = b43_phy_read(dev, B43_PHY_DACCTL);
 385		sav->phy_cck_14 = b43_phy_read(dev, B43_PHY_CCK(0x14));
 386		sav->phy_hpwr_tssictl = b43_phy_read(dev, B43_PHY_HPWR_TSSICTL);
 387
 388		b43_phy_set(dev, B43_PHY_HPWR_TSSICTL, 0x100);
 389		b43_phy_set(dev, B43_PHY_EXTG(0x01), 0x40);
 390		b43_phy_set(dev, B43_PHY_DACCTL, 0x40);
 391		b43_phy_set(dev, B43_PHY_CCK(0x14), 0x200);
 392	}
 393	if (phy->type == B43_PHYTYPE_B &&
 394	    phy->radio_ver == 0x2050 && phy->radio_rev < 6) {
 395		b43_phy_write(dev, B43_PHY_CCK(0x16), 0x410);
 396		b43_phy_write(dev, B43_PHY_CCK(0x17), 0x820);
 397	}
 398	if (phy->rev >= 2) {
 399		sav->phy_analogover = b43_phy_read(dev, B43_PHY_ANALOGOVER);
 400		sav->phy_analogoverval =
 401		    b43_phy_read(dev, B43_PHY_ANALOGOVERVAL);
 402		sav->phy_rfover = b43_phy_read(dev, B43_PHY_RFOVER);
 403		sav->phy_rfoverval = b43_phy_read(dev, B43_PHY_RFOVERVAL);
 404		sav->phy_classctl = b43_phy_read(dev, B43_PHY_CLASSCTL);
 405		sav->phy_cck_3E = b43_phy_read(dev, B43_PHY_CCK(0x3E));
 406		sav->phy_crs0 = b43_phy_read(dev, B43_PHY_CRS0);
 407
 408		b43_phy_mask(dev, B43_PHY_CLASSCTL, 0xFFFC);
 409		b43_phy_mask(dev, B43_PHY_CRS0, 0x7FFF);
 410		b43_phy_set(dev, B43_PHY_ANALOGOVER, 0x0003);
 411		b43_phy_mask(dev, B43_PHY_ANALOGOVERVAL, 0xFFFC);
 412		if (phy->type == B43_PHYTYPE_G) {
 413			if ((phy->rev >= 7) &&
 414			    (sprom->boardflags_lo & B43_BFL_EXTLNA)) {
 415				b43_phy_write(dev, B43_PHY_RFOVER, 0x933);
 416			} else {
 417				b43_phy_write(dev, B43_PHY_RFOVER, 0x133);
 418			}
 419		} else {
 420			b43_phy_write(dev, B43_PHY_RFOVER, 0);
 421		}
 422		b43_phy_write(dev, B43_PHY_CCK(0x3E), 0);
 423	}
 424	sav->reg_3F4 = b43_read16(dev, 0x3F4);
 425	sav->reg_3E2 = b43_read16(dev, 0x3E2);
 426	sav->radio_43 = b43_radio_read16(dev, 0x43);
 427	sav->radio_7A = b43_radio_read16(dev, 0x7A);
 428	sav->phy_pgactl = b43_phy_read(dev, B43_PHY_PGACTL);
 429	sav->phy_cck_2A = b43_phy_read(dev, B43_PHY_CCK(0x2A));
 430	sav->phy_syncctl = b43_phy_read(dev, B43_PHY_SYNCCTL);
 431	sav->phy_dacctl = b43_phy_read(dev, B43_PHY_DACCTL);
 432
 433	if (!has_tx_magnification(phy)) {
 434		sav->radio_52 = b43_radio_read16(dev, 0x52);
 435		sav->radio_52 &= 0x00F0;
 436	}
 437	if (phy->type == B43_PHYTYPE_B) {
 438		sav->phy_cck_30 = b43_phy_read(dev, B43_PHY_CCK(0x30));
 439		sav->phy_cck_06 = b43_phy_read(dev, B43_PHY_CCK(0x06));
 440		b43_phy_write(dev, B43_PHY_CCK(0x30), 0x00FF);
 441		b43_phy_write(dev, B43_PHY_CCK(0x06), 0x3F3F);
 442	} else {
 443		b43_write16(dev, 0x3E2, b43_read16(dev, 0x3E2)
 444			    | 0x8000);
 445	}
 446	b43_write16(dev, 0x3F4, b43_read16(dev, 0x3F4)
 447		    & 0xF000);
 448
 449	tmp =
 450	    (phy->type == B43_PHYTYPE_G) ? B43_PHY_LO_MASK : B43_PHY_CCK(0x2E);
 451	b43_phy_write(dev, tmp, 0x007F);
 452
 453	tmp = sav->phy_syncctl;
 454	b43_phy_write(dev, B43_PHY_SYNCCTL, tmp & 0xFF7F);
 455	tmp = sav->radio_7A;
 456	b43_radio_write16(dev, 0x007A, tmp & 0xFFF0);
 457
 458	b43_phy_write(dev, B43_PHY_CCK(0x2A), 0x8A3);
 459	if (phy->type == B43_PHYTYPE_G ||
 460	    (phy->type == B43_PHYTYPE_B &&
 461	     phy->radio_ver == 0x2050 && phy->radio_rev >= 6)) {
 462		b43_phy_write(dev, B43_PHY_CCK(0x2B), 0x1003);
 463	} else
 464		b43_phy_write(dev, B43_PHY_CCK(0x2B), 0x0802);
 465	if (phy->rev >= 2)
 466		b43_dummy_transmission(dev, false, true);
 467	b43_gphy_channel_switch(dev, 6, 0);
 468	b43_radio_read16(dev, 0x51);	/* dummy read */
 469	if (phy->type == B43_PHYTYPE_G)
 470		b43_phy_write(dev, B43_PHY_CCK(0x2F), 0);
 471
 472	/* Re-measure the txctl values, if needed. */
 473	if (time_before(lo->txctl_measured_time,
 474			jiffies - B43_LO_TXCTL_EXPIRE))
 475		lo_measure_txctl_values(dev);
 476
 477	if (phy->type == B43_PHYTYPE_G && phy->rev >= 3) {
 478		b43_phy_write(dev, B43_PHY_LO_MASK, 0xC078);
 479	} else {
 480		if (phy->type == B43_PHYTYPE_B)
 481			b43_phy_write(dev, B43_PHY_CCK(0x2E), 0x8078);
 482		else
 483			b43_phy_write(dev, B43_PHY_LO_MASK, 0x8078);
 484	}
 485}
 486
 487static void lo_measure_restore(struct b43_wldev *dev,
 488			       struct lo_g_saved_values *sav)
 489{
 490	struct b43_phy *phy = &dev->phy;
 491	struct b43_phy_g *gphy = phy->g;
 492	u16 tmp;
 493
 494	if (phy->rev >= 2) {
 495		b43_phy_write(dev, B43_PHY_PGACTL, 0xE300);
 496		tmp = (gphy->pga_gain << 8);
 497		b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA0);
 498		udelay(5);
 499		b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA2);
 500		udelay(2);
 501		b43_phy_write(dev, B43_PHY_RFOVERVAL, tmp | 0xA3);
 502	} else {
 503		tmp = (gphy->pga_gain | 0xEFA0);
 504		b43_phy_write(dev, B43_PHY_PGACTL, tmp);
 505	}
 506	if (phy->type == B43_PHYTYPE_G) {
 507		if (phy->rev >= 3)
 508			b43_phy_write(dev, B43_PHY_CCK(0x2E), 0xC078);
 509		else
 510			b43_phy_write(dev, B43_PHY_CCK(0x2E), 0x8078);
 511		if (phy->rev >= 2)
 512			b43_phy_write(dev, B43_PHY_CCK(0x2F), 0x0202);
 513		else
 514			b43_phy_write(dev, B43_PHY_CCK(0x2F), 0x0101);
 515	}
 516	b43_write16(dev, 0x3F4, sav->reg_3F4);
 517	b43_phy_write(dev, B43_PHY_PGACTL, sav->phy_pgactl);
 518	b43_phy_write(dev, B43_PHY_CCK(0x2A), sav->phy_cck_2A);
 519	b43_phy_write(dev, B43_PHY_SYNCCTL, sav->phy_syncctl);
 520	b43_phy_write(dev, B43_PHY_DACCTL, sav->phy_dacctl);
 521	b43_radio_write16(dev, 0x43, sav->radio_43);
 522	b43_radio_write16(dev, 0x7A, sav->radio_7A);
 523	if (!has_tx_magnification(phy)) {
 524		tmp = sav->radio_52;
 525		b43_radio_maskset(dev, 0x52, 0xFF0F, tmp);
 526	}
 527	b43_write16(dev, 0x3E2, sav->reg_3E2);
 528	if (phy->type == B43_PHYTYPE_B &&
 529	    phy->radio_ver == 0x2050 && phy->radio_rev <= 5) {
 530		b43_phy_write(dev, B43_PHY_CCK(0x30), sav->phy_cck_30);
 531		b43_phy_write(dev, B43_PHY_CCK(0x06), sav->phy_cck_06);
 532	}
 533	if (phy->rev >= 2) {
 534		b43_phy_write(dev, B43_PHY_ANALOGOVER, sav->phy_analogover);
 535		b43_phy_write(dev, B43_PHY_ANALOGOVERVAL,
 536			      sav->phy_analogoverval);
 537		b43_phy_write(dev, B43_PHY_CLASSCTL, sav->phy_classctl);
 538		b43_phy_write(dev, B43_PHY_RFOVER, sav->phy_rfover);
 539		b43_phy_write(dev, B43_PHY_RFOVERVAL, sav->phy_rfoverval);
 540		b43_phy_write(dev, B43_PHY_CCK(0x3E), sav->phy_cck_3E);
 541		b43_phy_write(dev, B43_PHY_CRS0, sav->phy_crs0);
 542	}
 543	if (b43_has_hardware_pctl(dev)) {
 544		tmp = (sav->phy_lo_mask & 0xBFFF);
 545		b43_phy_write(dev, B43_PHY_LO_MASK, tmp);
 546		b43_phy_write(dev, B43_PHY_EXTG(0x01), sav->phy_extg_01);
 547		b43_phy_write(dev, B43_PHY_DACCTL, sav->phy_dacctl_hwpctl);
 548		b43_phy_write(dev, B43_PHY_CCK(0x14), sav->phy_cck_14);
 549		b43_phy_write(dev, B43_PHY_HPWR_TSSICTL, sav->phy_hpwr_tssictl);
 550	}
 551	b43_gphy_channel_switch(dev, sav->old_channel, 1);
 552}
 553
 554struct b43_lo_g_statemachine {
 555	int current_state;
 556	int nr_measured;
 557	int state_val_multiplier;
 558	u16 lowest_feedth;
 559	struct b43_loctl min_loctl;
 560};
 561
 562/* Loop over each possible value in this state. */
 563static int lo_probe_possible_loctls(struct b43_wldev *dev,
 564				    struct b43_loctl *probe_loctl,
 565				    struct b43_lo_g_statemachine *d)
 566{
 567	struct b43_phy *phy = &dev->phy;
 568	struct b43_phy_g *gphy = phy->g;
 569	struct b43_loctl test_loctl;
 570	struct b43_loctl orig_loctl;
 571	struct b43_loctl prev_loctl = {
 572		.i = -100,
 573		.q = -100,
 574	};
 575	int i;
 576	int begin, end;
 577	int found_lower = 0;
 578	u16 feedth;
 579
 580	static const struct b43_loctl modifiers[] = {
 581		{.i = 1,.q = 1,},
 582		{.i = 1,.q = 0,},
 583		{.i = 1,.q = -1,},
 584		{.i = 0,.q = -1,},
 585		{.i = -1,.q = -1,},
 586		{.i = -1,.q = 0,},
 587		{.i = -1,.q = 1,},
 588		{.i = 0,.q = 1,},
 589	};
 590
 591	if (d->current_state == 0) {
 592		begin = 1;
 593		end = 8;
 594	} else if (d->current_state % 2 == 0) {
 595		begin = d->current_state - 1;
 596		end = d->current_state + 1;
 597	} else {
 598		begin = d->current_state - 2;
 599		end = d->current_state + 2;
 600	}
 601	if (begin < 1)
 602		begin += 8;
 603	if (end > 8)
 604		end -= 8;
 605
 606	memcpy(&orig_loctl, probe_loctl, sizeof(struct b43_loctl));
 607	i = begin;
 608	d->current_state = i;
 609	while (1) {
 610		B43_WARN_ON(!(i >= 1 && i <= 8));
 611		memcpy(&test_loctl, &orig_loctl, sizeof(struct b43_loctl));
 612		test_loctl.i += modifiers[i - 1].i * d->state_val_multiplier;
 613		test_loctl.q += modifiers[i - 1].q * d->state_val_multiplier;
 614		if ((test_loctl.i != prev_loctl.i ||
 615		     test_loctl.q != prev_loctl.q) &&
 616		    (abs(test_loctl.i) <= 16 && abs(test_loctl.q) <= 16)) {
 617			b43_lo_write(dev, &test_loctl);
 618			feedth = lo_measure_feedthrough(dev, gphy->lna_gain,
 619							gphy->pga_gain,
 620							gphy->trsw_rx_gain);
 621			if (feedth < d->lowest_feedth) {
 622				memcpy(probe_loctl, &test_loctl,
 623				       sizeof(struct b43_loctl));
 624				found_lower = 1;
 625				d->lowest_feedth = feedth;
 626				if ((d->nr_measured < 2) &&
 627				    !has_loopback_gain(phy))
 628					break;
 629			}
 630		}
 631		memcpy(&prev_loctl, &test_loctl, sizeof(prev_loctl));
 632		if (i == end)
 633			break;
 634		if (i == 8)
 635			i = 1;
 636		else
 637			i++;
 638		d->current_state = i;
 639	}
 640
 641	return found_lower;
 642}
 643
 644static void lo_probe_loctls_statemachine(struct b43_wldev *dev,
 645					 struct b43_loctl *loctl,
 646					 int *max_rx_gain)
 647{
 648	struct b43_phy *phy = &dev->phy;
 649	struct b43_phy_g *gphy = phy->g;
 650	struct b43_lo_g_statemachine d;
 651	u16 feedth;
 652	int found_lower;
 653	struct b43_loctl probe_loctl;
 654	int max_repeat = 1, repeat_cnt = 0;
 655
 656	d.nr_measured = 0;
 657	d.state_val_multiplier = 1;
 658	if (has_loopback_gain(phy))
 659		d.state_val_multiplier = 3;
 660
 661	memcpy(&d.min_loctl, loctl, sizeof(struct b43_loctl));
 662	if (has_loopback_gain(phy))
 663		max_repeat = 4;
 664	do {
 665		b43_lo_write(dev, &d.min_loctl);
 666		feedth = lo_measure_feedthrough(dev, gphy->lna_gain,
 667						gphy->pga_gain,
 668						gphy->trsw_rx_gain);
 669		if (feedth < 0x258) {
 670			if (feedth >= 0x12C)
 671				*max_rx_gain += 6;
 672			else
 673				*max_rx_gain += 3;
 674			feedth = lo_measure_feedthrough(dev, gphy->lna_gain,
 675							gphy->pga_gain,
 676							gphy->trsw_rx_gain);
 677		}
 678		d.lowest_feedth = feedth;
 679
 680		d.current_state = 0;
 681		do {
 682			B43_WARN_ON(!
 683				    (d.current_state >= 0
 684				     && d.current_state <= 8));
 685			memcpy(&probe_loctl, &d.min_loctl,
 686			       sizeof(struct b43_loctl));
 687			found_lower =
 688			    lo_probe_possible_loctls(dev, &probe_loctl, &d);
 689			if (!found_lower)
 690				break;
 691			if ((probe_loctl.i == d.min_loctl.i) &&
 692			    (probe_loctl.q == d.min_loctl.q))
 693				break;
 694			memcpy(&d.min_loctl, &probe_loctl,
 695			       sizeof(struct b43_loctl));
 696			d.nr_measured++;
 697		} while (d.nr_measured < 24);
 698		memcpy(loctl, &d.min_loctl, sizeof(struct b43_loctl));
 699
 700		if (has_loopback_gain(phy)) {
 701			if (d.lowest_feedth > 0x1194)
 702				*max_rx_gain -= 6;
 703			else if (d.lowest_feedth < 0x5DC)
 704				*max_rx_gain += 3;
 705			if (repeat_cnt == 0) {
 706				if (d.lowest_feedth <= 0x5DC) {
 707					d.state_val_multiplier = 1;
 708					repeat_cnt++;
 709				} else
 710					d.state_val_multiplier = 2;
 711			} else if (repeat_cnt == 2)
 712				d.state_val_multiplier = 1;
 713		}
 714		lo_measure_gain_values(dev, *max_rx_gain,
 715				       has_loopback_gain(phy));
 716	} while (++repeat_cnt < max_repeat);
 717}
 718
 719static
 720struct b43_lo_calib *b43_calibrate_lo_setting(struct b43_wldev *dev,
 721					      const struct b43_bbatt *bbatt,
 722					      const struct b43_rfatt *rfatt)
 723{
 724	struct b43_phy *phy = &dev->phy;
 725	struct b43_phy_g *gphy = phy->g;
 726	struct b43_loctl loctl = {
 727		.i = 0,
 728		.q = 0,
 729	};
 730	int max_rx_gain;
 731	struct b43_lo_calib *cal;
 732	struct lo_g_saved_values saved_regs;
 733	/* Values from the "TXCTL Register and Value Table" */
 734	u16 txctl_reg;
 735	u16 txctl_value;
 736	u16 pad_mix_gain;
 737
 738	saved_regs.old_channel = phy->channel;
 739	b43_mac_suspend(dev);
 740	lo_measure_setup(dev, &saved_regs);
 741
 742	txctl_reg = lo_txctl_register_table(dev, &txctl_value, &pad_mix_gain);
 743
 744	b43_radio_maskset(dev, 0x43, 0xFFF0, rfatt->att);
 745	b43_radio_maskset(dev, txctl_reg, ~txctl_value, (rfatt->with_padmix ? txctl_value :0));
 746
 747	max_rx_gain = rfatt->att * 2;
 748	max_rx_gain += bbatt->att / 2;
 749	if (rfatt->with_padmix)
 750		max_rx_gain -= pad_mix_gain;
 751	if (has_loopback_gain(phy))
 752		max_rx_gain += gphy->max_lb_gain;
 753	lo_measure_gain_values(dev, max_rx_gain,
 754			       has_loopback_gain(phy));
 755
 756	b43_gphy_set_baseband_attenuation(dev, bbatt->att);
 757	lo_probe_loctls_statemachine(dev, &loctl, &max_rx_gain);
 758
 759	lo_measure_restore(dev, &saved_regs);
 760	b43_mac_enable(dev);
 761
 762	if (b43_debug(dev, B43_DBG_LO)) {
 763		b43dbg(dev->wl, "LO: Calibrated for BB(%u), RF(%u,%u) "
 764		       "=> I=%d Q=%d\n",
 765		       bbatt->att, rfatt->att, rfatt->with_padmix,
 766		       loctl.i, loctl.q);
 767	}
 768
 769	cal = kmalloc(sizeof(*cal), GFP_KERNEL);
 770	if (!cal) {
 771		b43warn(dev->wl, "LO calib: out of memory\n");
 772		return NULL;
 773	}
 774	memcpy(&cal->bbatt, bbatt, sizeof(*bbatt));
 775	memcpy(&cal->rfatt, rfatt, sizeof(*rfatt));
 776	memcpy(&cal->ctl, &loctl, sizeof(loctl));
 777	cal->calib_time = jiffies;
 778	INIT_LIST_HEAD(&cal->list);
 779
 780	return cal;
 781}
 782
 783/* Get a calibrated LO setting for the given attenuation values.
 784 * Might return a NULL pointer under OOM! */
 785static
 786struct b43_lo_calib *b43_get_calib_lo_settings(struct b43_wldev *dev,
 787					       const struct b43_bbatt *bbatt,
 788					       const struct b43_rfatt *rfatt)
 789{
 790	struct b43_txpower_lo_control *lo = dev->phy.g->lo_control;
 791	struct b43_lo_calib *c;
 792
 793	c = b43_find_lo_calib(lo, bbatt, rfatt);
 794	if (c)
 795		return c;
 796	/* Not in the list of calibrated LO settings.
 797	 * Calibrate it now. */
 798	c = b43_calibrate_lo_setting(dev, bbatt, rfatt);
 799	if (!c)
 800		return NULL;
 801	list_add(&c->list, &lo->calib_list);
 802
 803	return c;
 804}
 805
 806void b43_gphy_dc_lt_init(struct b43_wldev *dev, bool update_all)
 807{
 808	struct b43_phy *phy = &dev->phy;
 809	struct b43_phy_g *gphy = phy->g;
 810	struct b43_txpower_lo_control *lo = gphy->lo_control;
 811	int i;
 812	int rf_offset, bb_offset;
 813	const struct b43_rfatt *rfatt;
 814	const struct b43_bbatt *bbatt;
 815	u64 power_vector;
 816	bool table_changed = false;
 817
 818	BUILD_BUG_ON(B43_DC_LT_SIZE != 32);
 819	B43_WARN_ON(lo->rfatt_list.len * lo->bbatt_list.len > 64);
 820
 821	power_vector = lo->power_vector;
 822	if (!update_all && !power_vector)
 823		return; /* Nothing to do. */
 824
 825	/* Suspend the MAC now to avoid continuous suspend/enable
 826	 * cycles in the loop. */
 827	b43_mac_suspend(dev);
 828
 829	for (i = 0; i < B43_DC_LT_SIZE * 2; i++) {
 830		struct b43_lo_calib *cal;
 831		int idx;
 832		u16 val;
 833
 834		if (!update_all && !(power_vector & (((u64)1ULL) << i)))
 835			continue;
 836		/* Update the table entry for this power_vector bit.
 837		 * The table rows are RFatt entries and columns are BBatt. */
 838		bb_offset = i / lo->rfatt_list.len;
 839		rf_offset = i % lo->rfatt_list.len;
 840		bbatt = &(lo->bbatt_list.list[bb_offset]);
 841		rfatt = &(lo->rfatt_list.list[rf_offset]);
 842
 843		cal = b43_calibrate_lo_setting(dev, bbatt, rfatt);
 844		if (!cal) {
 845			b43warn(dev->wl, "LO: Could not "
 846				"calibrate DC table entry\n");
 847			continue;
 848		}
 849		/*FIXME: Is Q really in the low nibble? */
 850		val = (u8)(cal->ctl.q);
 851		val |= ((u8)(cal->ctl.i)) << 4;
 852		kfree(cal);
 853
 854		/* Get the index into the hardware DC LT. */
 855		idx = i / 2;
 856		/* Change the table in memory. */
 857		if (i % 2) {
 858			/* Change the high byte. */
 859			lo->dc_lt[idx] = (lo->dc_lt[idx] & 0x00FF)
 860					 | ((val & 0x00FF) << 8);
 861		} else {
 862			/* Change the low byte. */
 863			lo->dc_lt[idx] = (lo->dc_lt[idx] & 0xFF00)
 864					 | (val & 0x00FF);
 865		}
 866		table_changed = true;
 867	}
 868	if (table_changed) {
 869		/* The table changed in memory. Update the hardware table. */
 870		for (i = 0; i < B43_DC_LT_SIZE; i++)
 871			b43_phy_write(dev, 0x3A0 + i, lo->dc_lt[i]);
 872	}
 873	b43_mac_enable(dev);
 874}
 875
 876/* Fixup the RF attenuation value for the case where we are
 877 * using the PAD mixer. */
 878static inline void b43_lo_fixup_rfatt(struct b43_rfatt *rf)
 879{
 880	if (!rf->with_padmix)
 881		return;
 882	if ((rf->att != 1) && (rf->att != 2) && (rf->att != 3))
 883		rf->att = 4;
 884}
 885
 886void b43_lo_g_adjust(struct b43_wldev *dev)
 887{
 888	struct b43_phy_g *gphy = dev->phy.g;
 889	struct b43_lo_calib *cal;
 890	struct b43_rfatt rf;
 891
 892	memcpy(&rf, &gphy->rfatt, sizeof(rf));
 893	b43_lo_fixup_rfatt(&rf);
 894
 895	cal = b43_get_calib_lo_settings(dev, &gphy->bbatt, &rf);
 896	if (!cal)
 897		return;
 898	b43_lo_write(dev, &cal->ctl);
 899}
 900
 901void b43_lo_g_adjust_to(struct b43_wldev *dev,
 902			u16 rfatt, u16 bbatt, u16 tx_control)
 903{
 904	struct b43_rfatt rf;
 905	struct b43_bbatt bb;
 906	struct b43_lo_calib *cal;
 907
 908	memset(&rf, 0, sizeof(rf));
 909	memset(&bb, 0, sizeof(bb));
 910	rf.att = rfatt;
 911	bb.att = bbatt;
 912	b43_lo_fixup_rfatt(&rf);
 913	cal = b43_get_calib_lo_settings(dev, &bb, &rf);
 914	if (!cal)
 915		return;
 916	b43_lo_write(dev, &cal->ctl);
 917}
 918
 919/* Periodic LO maintenance work */
 920void b43_lo_g_maintenance_work(struct b43_wldev *dev)
 921{
 922	struct b43_phy *phy = &dev->phy;
 923	struct b43_phy_g *gphy = phy->g;
 924	struct b43_txpower_lo_control *lo = gphy->lo_control;
 925	unsigned long now;
 926	unsigned long expire;
 927	struct b43_lo_calib *cal, *tmp;
 928	bool current_item_expired = false;
 929	bool hwpctl;
 930
 931	if (!lo)
 932		return;
 933	now = jiffies;
 934	hwpctl = b43_has_hardware_pctl(dev);
 935
 936	if (hwpctl) {
 937		/* Read the power vector and update it, if needed. */
 938		expire = now - B43_LO_PWRVEC_EXPIRE;
 939		if (time_before(lo->pwr_vec_read_time, expire)) {
 940			lo_read_power_vector(dev);
 941			b43_gphy_dc_lt_init(dev, 0);
 942		}
 943		//FIXME Recalc the whole DC table from time to time?
 944	}
 945
 946	if (hwpctl)
 947		return;
 948	/* Search for expired LO settings. Remove them.
 949	 * Recalibrate the current setting, if expired. */
 950	expire = now - B43_LO_CALIB_EXPIRE;
 951	list_for_each_entry_safe(cal, tmp, &lo->calib_list, list) {
 952		if (!time_before(cal->calib_time, expire))
 953			continue;
 954		/* This item expired. */
 955		if (b43_compare_bbatt(&cal->bbatt, &gphy->bbatt) &&
 956		    b43_compare_rfatt(&cal->rfatt, &gphy->rfatt)) {
 957			B43_WARN_ON(current_item_expired);
 958			current_item_expired = true;
 959		}
 960		if (b43_debug(dev, B43_DBG_LO)) {
 961			b43dbg(dev->wl, "LO: Item BB(%u), RF(%u,%u), "
 962			       "I=%d, Q=%d expired\n",
 963			       cal->bbatt.att, cal->rfatt.att,
 964			       cal->rfatt.with_padmix,
 965			       cal->ctl.i, cal->ctl.q);
 966		}
 967		list_del(&cal->list);
 968		kfree(cal);
 969	}
 970	if (current_item_expired || unlikely(list_empty(&lo->calib_list))) {
 971		/* Recalibrate currently used LO setting. */
 972		if (b43_debug(dev, B43_DBG_LO))
 973			b43dbg(dev->wl, "LO: Recalibrating current LO setting\n");
 974		cal = b43_calibrate_lo_setting(dev, &gphy->bbatt, &gphy->rfatt);
 975		if (cal) {
 976			list_add(&cal->list, &lo->calib_list);
 977			b43_lo_write(dev, &cal->ctl);
 978		} else
 979			b43warn(dev->wl, "Failed to recalibrate current LO setting\n");
 980	}
 981}
 982
 983void b43_lo_g_cleanup(struct b43_wldev *dev)
 984{
 985	struct b43_txpower_lo_control *lo = dev->phy.g->lo_control;
 986	struct b43_lo_calib *cal, *tmp;
 987
 988	if (!lo)
 989		return;
 990	list_for_each_entry_safe(cal, tmp, &lo->calib_list, list) {
 991		list_del(&cal->list);
 992		kfree(cal);
 993	}
 994}
 995
 996/* LO Initialization */
 997void b43_lo_g_init(struct b43_wldev *dev)
 998{
 999	if (b43_has_hardware_pctl(dev)) {
1000		lo_read_power_vector(dev);
1001		b43_gphy_dc_lt_init(dev, 1);
1002	}
1003}