drivers/net/wireless/b43/phy_common.c

   1 /*
   2
   3   Broadcom B43 wireless driver
   4   Common PHY routines
   5
   6   Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
   7   Copyright (c) 2005-2007 Stefano Brivio <stefano.brivio@polimi.it>
   8   Copyright (c) 2005-2008 Michael Buesch <m@bues.ch>
   9   Copyright (c) 2005, 2006 Danny van Dyk <kugelfang@gentoo.org>
  10   Copyright (c) 2005, 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch>
  11
  12   This program is free software; you can redistribute it and/or modify
  13   it under the terms of the GNU General Public License as published by
  14   the Free Software Foundation; either version 2 of the License, or
  15   (at your option) any later version.
  16
  17   This program is distributed in the hope that it will be useful,
  18   but WITHOUT ANY WARRANTY; without even the implied warranty of
  19   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20   GNU General Public License for more details.
  21
  22   You should have received a copy of the GNU General Public License
  23   along with this program; see the file COPYING.  If not, write to
  24   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  25   Boston, MA 02110-1301, USA.
  26
  27 */
  28
  29 #include "phy_common.h"
  30 #include "phy_g.h"
  31 #include "phy_a.h"
  32 #include "phy_n.h"
  33 #include "phy_lp.h"
  34 #include "phy_ht.h"
  35 #include "phy_lcn.h"
  36 #include "b43.h"
  37 #include "main.h"
  38
  39
  40 int b43_phy_allocate(struct b43_wldev *dev)
  41 {
  42         struct b43_phy *phy = &(dev->phy);
  43         int err;
  44
  45         phy->ops = NULL;
  46
  47         switch (phy->type) {
  48         case B43_PHYTYPE_A:
  49                 phy->ops = &b43_phyops_a;
  50                 break;
  51         case B43_PHYTYPE_G:
  52                 phy->ops = &b43_phyops_g;
  53                 break;
  54         case B43_PHYTYPE_N:
  55 #ifdef CONFIG_B43_PHY_N
  56                 phy->ops = &b43_phyops_n;
  57 #endif
  58                 break;
  59         case B43_PHYTYPE_LP:
  60 #ifdef CONFIG_B43_PHY_LP
  61                 phy->ops = &b43_phyops_lp;
  62 #endif
  63                 break;
  64         case B43_PHYTYPE_HT:
  65 #ifdef CONFIG_B43_PHY_HT
  66                 phy->ops = &b43_phyops_ht;
  67 #endif
  68                 break;
  69         case B43_PHYTYPE_LCN:
  70 #ifdef CONFIG_B43_PHY_LCN
  71                 phy->ops = &b43_phyops_lcn;
  72 #endif
  73                 break;
  74         }
  75         if (B43_WARN_ON(!phy->ops))
  76                 return -ENODEV;
  77
  78         err = phy->ops->allocate(dev);
  79         if (err)
  80                 phy->ops = NULL;
  81
  82         return err;
  83 }
  84
  85 void b43_phy_free(struct b43_wldev *dev)
  86 {
  87         dev->phy.ops->free(dev);
  88         dev->phy.ops = NULL;
  89 }
  90
  91 int b43_phy_init(struct b43_wldev *dev)
  92 {
  93         struct b43_phy *phy = &dev->phy;
  94         const struct b43_phy_operations *ops = phy->ops;
  95         int err;
  96
  97         phy->channel = ops->get_default_chan(dev);
  98
  99         ops->software_rfkill(dev, false);
 100         err = ops->init(dev);
 101         if (err) {
 102                 b43err(dev->wl, "PHY init failed\n");
 103                 goto err_block_rf;
 104         }
 105         /* Make sure to switch hardware and firmware (SHM) to
 106          * the default channel. */
 107         err = b43_switch_channel(dev, ops->get_default_chan(dev));
 108         if (err) {
 109                 b43err(dev->wl, "PHY init: Channel switch to default failed\n");
 110                 goto err_phy_exit;
 111         }
 112
 113         return 0;
 114
 115 err_phy_exit:
 116         if (ops->exit)
 117                 ops->exit(dev);
 118 err_block_rf:
 119         ops->software_rfkill(dev, true);
 120
 121         return err;
 122 }
 123
 124 void b43_phy_exit(struct b43_wldev *dev)
 125 {
 126         const struct b43_phy_operations *ops = dev->phy.ops;
 127
 128         ops->software_rfkill(dev, true);
 129         if (ops->exit)
 130                 ops->exit(dev);
 131 }
 132
 133 bool b43_has_hardware_pctl(struct b43_wldev *dev)
 134 {
 135         if (!dev->phy.hardware_power_control)
 136                 return 0;
 137         if (!dev->phy.ops->supports_hwpctl)
 138                 return 0;
 139         return dev->phy.ops->supports_hwpctl(dev);
 140 }
 141
 142 void b43_radio_lock(struct b43_wldev *dev)
 143 {
 144         u32 macctl;
 145
 146 #if B43_DEBUG
 147         B43_WARN_ON(dev->phy.radio_locked);
 148         dev->phy.radio_locked = true;
 149 #endif
 150
 151         macctl = b43_read32(dev, B43_MMIO_MACCTL);
 152         macctl |= B43_MACCTL_RADIOLOCK;
 153         b43_write32(dev, B43_MMIO_MACCTL, macctl);
 154         /* Commit the write and wait for the firmware
 155          * to finish any radio register access. */
 156         b43_read32(dev, B43_MMIO_MACCTL);
 157         udelay(10);
 158 }
 159
 160 void b43_radio_unlock(struct b43_wldev *dev)
 161 {
 162         u32 macctl;
 163
 164 #if B43_DEBUG
 165         B43_WARN_ON(!dev->phy.radio_locked);
 166         dev->phy.radio_locked = false;
 167 #endif
 168
 169         /* Commit any write */
 170         b43_read16(dev, B43_MMIO_PHY_VER);
 171         /* unlock */
 172         macctl = b43_read32(dev, B43_MMIO_MACCTL);
 173         macctl &= ~B43_MACCTL_RADIOLOCK;
 174         b43_write32(dev, B43_MMIO_MACCTL, macctl);
 175 }
 176
 177 void b43_phy_lock(struct b43_wldev *dev)
 178 {
 179 #if B43_DEBUG
 180         B43_WARN_ON(dev->phy.phy_locked);
 181         dev->phy.phy_locked = true;
 182 #endif
 183         B43_WARN_ON(dev->dev->core_rev < 3);
 184
 185         if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP))
 186                 b43_power_saving_ctl_bits(dev, B43_PS_AWAKE);
 187 }
 188
 189 void b43_phy_unlock(struct b43_wldev *dev)
 190 {
 191 #if B43_DEBUG
 192         B43_WARN_ON(!dev->phy.phy_locked);
 193         dev->phy.phy_locked = false;
 194 #endif
 195         B43_WARN_ON(dev->dev->core_rev < 3);
 196
 197         if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP))
 198                 b43_power_saving_ctl_bits(dev, 0);
 199 }
 200
 201 static inline void assert_mac_suspended(struct b43_wldev *dev)
 202 {
 203         if (!B43_DEBUG)
 204                 return;
 205         if ((b43_status(dev) >= B43_STAT_INITIALIZED) &&
 206             (dev->mac_suspended <= 0)) {
 207                 b43dbg(dev->wl, "PHY/RADIO register access with "
 208                        "enabled MAC.\n");
 209                 dump_stack();
 210         }
 211 }
 212
 213 u16 b43_radio_read(struct b43_wldev *dev, u16 reg)
 214 {
 215         assert_mac_suspended(dev);
 216         return dev->phy.ops->radio_read(dev, reg);
 217 }
 218
 219 void b43_radio_write(struct b43_wldev *dev, u16 reg, u16 value)
 220 {
 221         assert_mac_suspended(dev);
 222         dev->phy.ops->radio_write(dev, reg, value);
 223 }
 224
 225 void b43_radio_mask(struct b43_wldev *dev, u16 offset, u16 mask)
 226 {
 227         b43_radio_write16(dev, offset,
 228                           b43_radio_read16(dev, offset) & mask);
 229 }
 230
 231 void b43_radio_set(struct b43_wldev *dev, u16 offset, u16 set)
 232 {
 233         b43_radio_write16(dev, offset,
 234                           b43_radio_read16(dev, offset) | set);
 235 }
 236
 237 void b43_radio_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set)
 238 {
 239         b43_radio_write16(dev, offset,
 240                           (b43_radio_read16(dev, offset) & mask) | set);
 241 }
 242
 243 bool b43_radio_wait_value(struct b43_wldev *dev, u16 offset, u16 mask,
 244                           u16 value, int delay, int timeout)
 245 {
 246         u16 val;
 247         int i;
 248
 249         for (i = 0; i < timeout; i += delay) {
 250                 val = b43_radio_read(dev, offset);
 251                 if ((val & mask) == value)
 252                         return true;
 253                 udelay(delay);
 254         }
 255         return false;
 256 }
 257
 258 u16 b43_phy_read(struct b43_wldev *dev, u16 reg)
 259 {
 260         assert_mac_suspended(dev);
 261         dev->phy.writes_counter = 0;
 262         return dev->phy.ops->phy_read(dev, reg);
 263 }
 264
 265 void b43_phy_write(struct b43_wldev *dev, u16 reg, u16 value)
 266 {
 267         assert_mac_suspended(dev);
 268         dev->phy.ops->phy_write(dev, reg, value);
 269         if (++dev->phy.writes_counter == B43_MAX_WRITES_IN_ROW) {
 270                 b43_read16(dev, B43_MMIO_PHY_VER);
 271                 dev->phy.writes_counter = 0;
 272         }
 273 }
 274
 275 void b43_phy_copy(struct b43_wldev *dev, u16 destreg, u16 srcreg)
 276 {
 277         assert_mac_suspended(dev);
 278         dev->phy.ops->phy_write(dev, destreg,
 279                 dev->phy.ops->phy_read(dev, srcreg));
 280 }
 281
 282 void b43_phy_mask(struct b43_wldev *dev, u16 offset, u16 mask)
 283 {
 284         if (dev->phy.ops->phy_maskset) {
 285                 assert_mac_suspended(dev);
 286                 dev->phy.ops->phy_maskset(dev, offset, mask, 0);
 287         } else {
 288                 b43_phy_write(dev, offset,
 289                               b43_phy_read(dev, offset) & mask);
 290         }
 291 }
 292
 293 void b43_phy_set(struct b43_wldev *dev, u16 offset, u16 set)
 294 {
 295         if (dev->phy.ops->phy_maskset) {
 296                 assert_mac_suspended(dev);
 297                 dev->phy.ops->phy_maskset(dev, offset, 0xFFFF, set);
 298         } else {
 299                 b43_phy_write(dev, offset,
 300                               b43_phy_read(dev, offset) | set);
 301         }
 302 }
 303
 304 void b43_phy_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set)
 305 {
 306         if (dev->phy.ops->phy_maskset) {
 307                 assert_mac_suspended(dev);
 308                 dev->phy.ops->phy_maskset(dev, offset, mask, set);
 309         } else {
 310                 b43_phy_write(dev, offset,
 311                               (b43_phy_read(dev, offset) & mask) | set);
 312         }
 313 }
 314
 315 int b43_switch_channel(struct b43_wldev *dev, unsigned int new_channel)
 316 {
 317         struct b43_phy *phy = &(dev->phy);
 318         u16 channelcookie, savedcookie;
 319         int err;
 320
 321         if (new_channel == B43_DEFAULT_CHANNEL)
 322                 new_channel = phy->ops->get_default_chan(dev);
 323
 324         /* First we set the channel radio code to prevent the
 325          * firmware from sending ghost packets.
 326          */
 327         channelcookie = new_channel;
 328         if (b43_current_band(dev->wl) == IEEE80211_BAND_5GHZ)
 329                 channelcookie |= B43_SHM_SH_CHAN_5GHZ;
 330         /* FIXME: set 40Mhz flag if required */
 331         if (0)
 332                 channelcookie |= B43_SHM_SH_CHAN_40MHZ;
 333         savedcookie = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN);
 334         b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN, channelcookie);
 335
 336         /* Now try to switch the PHY hardware channel. */
 337         err = phy->ops->switch_channel(dev, new_channel);
 338         if (err)
 339                 goto err_restore_cookie;
 340
 341         dev->phy.channel = new_channel;
 342         /* Wait for the radio to tune to the channel and stabilize. */
 343         msleep(8);
 344
 345         return 0;
 346
 347 err_restore_cookie:
 348         b43_shm_write16(dev, B43_SHM_SHARED,
 349                         B43_SHM_SH_CHAN, savedcookie);
 350
 351         return err;
 352 }
 353
 354 void b43_software_rfkill(struct b43_wldev *dev, bool blocked)
 355 {
 356         struct b43_phy *phy = &dev->phy;
 357
 358         b43_mac_suspend(dev);
 359         phy->ops->software_rfkill(dev, blocked);
 360         phy->radio_on = !blocked;
 361         b43_mac_enable(dev);
 362 }
 363
 364 /**
 365  * b43_phy_txpower_adjust_work - TX power workqueue.
 366  *
 367  * Workqueue for updating the TX power parameters in hardware.
 368  */
 369 void b43_phy_txpower_adjust_work(struct work_struct *work)
 370 {
 371         struct b43_wl *wl = container_of(work, struct b43_wl,
 372                                          txpower_adjust_work);
 373         struct b43_wldev *dev;
 374
 375         mutex_lock(&wl->mutex);
 376         dev = wl->current_dev;
 377
 378         if (likely(dev && (b43_status(dev) >= B43_STAT_STARTED)))
 379                 dev->phy.ops->adjust_txpower(dev);
 380
 381         mutex_unlock(&wl->mutex);
 382 }
 383
 384 void b43_phy_txpower_check(struct b43_wldev *dev, unsigned int flags)
 385 {
 386         struct b43_phy *phy = &dev->phy;
 387         unsigned long now = jiffies;
 388         enum b43_txpwr_result result;
 389
 390         if (!(flags & B43_TXPWR_IGNORE_TIME)) {
 391                 /* Check if it's time for a TXpower check. */
 392                 if (time_before(now, phy->next_txpwr_check_time))
 393                         return; /* Not yet */
 394         }
 395         /* The next check will be needed in two seconds, or later. */
 396         phy->next_txpwr_check_time = round_jiffies(now + (HZ * 2));
 397
 398         if ((dev->dev->board_vendor == SSB_BOARDVENDOR_BCM) &&
 399             (dev->dev->board_type == SSB_BOARD_BU4306))
 400                 return; /* No software txpower adjustment needed */
 401
 402         result = phy->ops->recalc_txpower(dev, !!(flags & B43_TXPWR_IGNORE_TSSI));
 403         if (result == B43_TXPWR_RES_DONE)
 404                 return; /* We are done. */
 405         B43_WARN_ON(result != B43_TXPWR_RES_NEED_ADJUST);
 406         B43_WARN_ON(phy->ops->adjust_txpower == NULL);
 407
 408         /* We must adjust the transmission power in hardware.
 409          * Schedule b43_phy_txpower_adjust_work(). */
 410         ieee80211_queue_work(dev->wl->hw, &dev->wl->txpower_adjust_work);
 411 }
 412
 413 int b43_phy_shm_tssi_read(struct b43_wldev *dev, u16 shm_offset)
 414 {
 415         const bool is_ofdm = (shm_offset != B43_SHM_SH_TSSI_CCK);
 416         unsigned int a, b, c, d;
 417         unsigned int average;
 418         u32 tmp;
 419
 420         tmp = b43_shm_read32(dev, B43_SHM_SHARED, shm_offset);
 421         a = tmp & 0xFF;
 422         b = (tmp >> 8) & 0xFF;
 423         c = (tmp >> 16) & 0xFF;
 424         d = (tmp >> 24) & 0xFF;
 425         if (a == 0 || a == B43_TSSI_MAX ||
 426             b == 0 || b == B43_TSSI_MAX ||
 427             c == 0 || c == B43_TSSI_MAX ||
 428             d == 0 || d == B43_TSSI_MAX)
 429                 return -ENOENT;
 430         /* The values are OK. Clear them. */
 431         tmp = B43_TSSI_MAX | (B43_TSSI_MAX << 8) |
 432               (B43_TSSI_MAX << 16) | (B43_TSSI_MAX << 24);
 433         b43_shm_write32(dev, B43_SHM_SHARED, shm_offset, tmp);
 434
 435         if (is_ofdm) {
 436                 a = (a + 32) & 0x3F;
 437                 b = (b + 32) & 0x3F;
 438                 c = (c + 32) & 0x3F;
 439                 d = (d + 32) & 0x3F;
 440         }
 441
 442         /* Get the average of the values with 0.5 added to each value. */
 443         average = (a + b + c + d + 2) / 4;
 444         if (is_ofdm) {
 445                 /* Adjust for CCK-boost */
 446                 if (b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTF1)
 447                     & B43_HF_CCKBOOST)
 448                         average = (average >= 13) ? (average - 13) : 0;
 449         }
 450
 451         return average;
 452 }
 453
 454 void b43_phyop_switch_analog_generic(struct b43_wldev *dev, bool on)
 455 {
 456         b43_write16(dev, B43_MMIO_PHY0, on ? 0 : 0xF4);
 457 }
 458
 459
 460 bool b43_channel_type_is_40mhz(enum nl80211_channel_type channel_type)
 461 {
 462         return (channel_type == NL80211_CHAN_HT40MINUS ||
 463                 channel_type == NL80211_CHAN_HT40PLUS);
 464 }
 465
 466 /* http://bcm-v4.sipsolutions.net/802.11/PHY/N/BmacPhyClkFgc */
 467 void b43_phy_force_clock(struct b43_wldev *dev, bool force)
 468 {
 469         u32 tmp;
 470
 471         WARN_ON(dev->phy.type != B43_PHYTYPE_N &&
 472                 dev->phy.type != B43_PHYTYPE_HT);
 473
 474         switch (dev->dev->bus_type) {
 475 #ifdef CONFIG_B43_BCMA
 476         case B43_BUS_BCMA:
 477                 tmp = bcma_aread32(dev->dev->bdev, BCMA_IOCTL);
 478                 if (force)
 479                         tmp |= BCMA_IOCTL_FGC;
 480                 else
 481                         tmp &= ~BCMA_IOCTL_FGC;
 482                 bcma_awrite32(dev->dev->bdev, BCMA_IOCTL, tmp);
 483                 break;
 484 #endif
 485 #ifdef CONFIG_B43_SSB
 486         case B43_BUS_SSB:
 487                 tmp = ssb_read32(dev->dev->sdev, SSB_TMSLOW);
 488                 if (force)
 489                         tmp |= SSB_TMSLOW_FGC;
 490                 else
 491                         tmp &= ~SSB_TMSLOW_FGC;
 492                 ssb_write32(dev->dev->sdev, SSB_TMSLOW, tmp);
 493                 break;
 494 #endif
 495         }
 496 }
 497
 498 /* http://bcm-v4.sipsolutions.net/802.11/PHY/Cordic */
 499 struct b43_c32 b43_cordic(int theta)
 500 {
 501         static const u32 arctg[] = {
 502                 2949120, 1740967, 919879, 466945, 234379, 117304,
 503                   58666,   29335,  14668,   7334,   3667,   1833,
 504                     917,     458,    229,    115,     57,     29,
 505         };
 506         u8 i;
 507         s32 tmp;
 508         s8 signx = 1;
 509         u32 angle = 0;
 510         struct b43_c32 ret = { .i = 39797, .q = 0, };
 511
 512         while (theta > (180 << 16))
 513                 theta -= (360 << 16);
 514         while (theta < -(180 << 16))
 515                 theta += (360 << 16);
 516
 517         if (theta > (90 << 16)) {
 518                 theta -= (180 << 16);
 519                 signx = -1;
 520         } else if (theta < -(90 << 16)) {
 521                 theta += (180 << 16);
 522                 signx = -1;
 523         }
 524
 525         for (i = 0; i <= 17; i++) {
 526                 if (theta > angle) {
 527                         tmp = ret.i - (ret.q >> i);
 528                         ret.q += ret.i >> i;
 529                         ret.i = tmp;
 530                         angle += arctg[i];
 531                 } else {
 532                         tmp = ret.i + (ret.q >> i);
 533                         ret.q -= ret.i >> i;
 534                         ret.i = tmp;
 535                         angle -= arctg[i];
 536                 }
 537         }
 538
 539         ret.i *= signx;
 540         ret.q *= signx;
 541
 542         return ret;
 543 }