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 "b43.h"
  35 #include "main.h"
  36
  37
  38 int b43_phy_allocate(struct b43_wldev *dev)
  39 {
  40         struct b43_phy *phy = &(dev->phy);
  41         int err;
  42
  43         phy->ops = NULL;
  44
  45         switch (phy->type) {
  46         case B43_PHYTYPE_A:
  47                 phy->ops = &b43_phyops_a;
  48                 break;
  49         case B43_PHYTYPE_G:
  50                 phy->ops = &b43_phyops_g;
  51                 break;
  52         case B43_PHYTYPE_N:
  53 #ifdef CONFIG_B43_PHY_N
  54                 phy->ops = &b43_phyops_n;
  55 #endif
  56                 break;
  57         case B43_PHYTYPE_LP:
  58 #ifdef CONFIG_B43_PHY_LP
  59                 phy->ops = &b43_phyops_lp;
  60 #endif
  61                 break;
  62         }
  63         if (B43_WARN_ON(!phy->ops))
  64                 return -ENODEV;
  65
  66         err = phy->ops->allocate(dev);
  67         if (err)
  68                 phy->ops = NULL;
  69
  70         return err;
  71 }
  72
  73 void b43_phy_free(struct b43_wldev *dev)
  74 {
  75         dev->phy.ops->free(dev);
  76         dev->phy.ops = NULL;
  77 }
  78
  79 int b43_phy_init(struct b43_wldev *dev)
  80 {
  81         struct b43_phy *phy = &dev->phy;
  82         const struct b43_phy_operations *ops = phy->ops;
  83         int err;
  84
  85         phy->channel = ops->get_default_chan(dev);
  86
  87         ops->software_rfkill(dev, false);
  88         err = ops->init(dev);
  89         if (err) {
  90                 b43err(dev->wl, "PHY init failed\n");
  91                 goto err_block_rf;
  92         }
  93         /* Make sure to switch hardware and firmware (SHM) to
  94          * the default channel. */
  95         err = b43_switch_channel(dev, ops->get_default_chan(dev));
  96         if (err) {
  97                 b43err(dev->wl, "PHY init: Channel switch to default failed\n");
  98                 goto err_phy_exit;
  99         }
 100
 101         return 0;
 102
 103 err_phy_exit:
 104         if (ops->exit)
 105                 ops->exit(dev);
 106 err_block_rf:
 107         ops->software_rfkill(dev, true);
 108
 109         return err;
 110 }
 111
 112 void b43_phy_exit(struct b43_wldev *dev)
 113 {
 114         const struct b43_phy_operations *ops = dev->phy.ops;
 115
 116         ops->software_rfkill(dev, true);
 117         if (ops->exit)
 118                 ops->exit(dev);
 119 }
 120
 121 bool b43_has_hardware_pctl(struct b43_wldev *dev)
 122 {
 123         if (!dev->phy.hardware_power_control)
 124                 return 0;
 125         if (!dev->phy.ops->supports_hwpctl)
 126                 return 0;
 127         return dev->phy.ops->supports_hwpctl(dev);
 128 }
 129
 130 void b43_radio_lock(struct b43_wldev *dev)
 131 {
 132         u32 macctl;
 133
 134 #if B43_DEBUG
 135         B43_WARN_ON(dev->phy.radio_locked);
 136         dev->phy.radio_locked = 1;
 137 #endif
 138
 139         macctl = b43_read32(dev, B43_MMIO_MACCTL);
 140         macctl |= B43_MACCTL_RADIOLOCK;
 141         b43_write32(dev, B43_MMIO_MACCTL, macctl);
 142         /* Commit the write and wait for the firmware
 143          * to finish any radio register access. */
 144         b43_read32(dev, B43_MMIO_MACCTL);
 145         udelay(10);
 146 }
 147
 148 void b43_radio_unlock(struct b43_wldev *dev)
 149 {
 150         u32 macctl;
 151
 152 #if B43_DEBUG
 153         B43_WARN_ON(!dev->phy.radio_locked);
 154         dev->phy.radio_locked = 0;
 155 #endif
 156
 157         /* Commit any write */
 158         b43_read16(dev, B43_MMIO_PHY_VER);
 159         /* unlock */
 160         macctl = b43_read32(dev, B43_MMIO_MACCTL);
 161         macctl &= ~B43_MACCTL_RADIOLOCK;
 162         b43_write32(dev, B43_MMIO_MACCTL, macctl);
 163 }
 164
 165 void b43_phy_lock(struct b43_wldev *dev)
 166 {
 167 #if B43_DEBUG
 168         B43_WARN_ON(dev->phy.phy_locked);
 169         dev->phy.phy_locked = 1;
 170 #endif
 171         B43_WARN_ON(dev->sdev->id.revision < 3);
 172
 173         if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP))
 174                 b43_power_saving_ctl_bits(dev, B43_PS_AWAKE);
 175 }
 176
 177 void b43_phy_unlock(struct b43_wldev *dev)
 178 {
 179 #if B43_DEBUG
 180         B43_WARN_ON(!dev->phy.phy_locked);
 181         dev->phy.phy_locked = 0;
 182 #endif
 183         B43_WARN_ON(dev->sdev->id.revision < 3);
 184
 185         if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP))
 186                 b43_power_saving_ctl_bits(dev, 0);
 187 }
 188
 189 static inline void assert_mac_suspended(struct b43_wldev *dev)
 190 {
 191         if (!B43_DEBUG)
 192                 return;
 193         if ((b43_status(dev) >= B43_STAT_INITIALIZED) &&
 194             (dev->mac_suspended <= 0)) {
 195                 b43dbg(dev->wl, "PHY/RADIO register access with "
 196                        "enabled MAC.\n");
 197                 dump_stack();
 198         }
 199 }
 200
 201 u16 b43_radio_read(struct b43_wldev *dev, u16 reg)
 202 {
 203         assert_mac_suspended(dev);
 204         return dev->phy.ops->radio_read(dev, reg);
 205 }
 206
 207 void b43_radio_write(struct b43_wldev *dev, u16 reg, u16 value)
 208 {
 209         assert_mac_suspended(dev);
 210         dev->phy.ops->radio_write(dev, reg, value);
 211 }
 212
 213 void b43_radio_mask(struct b43_wldev *dev, u16 offset, u16 mask)
 214 {
 215         b43_radio_write16(dev, offset,
 216                           b43_radio_read16(dev, offset) & mask);
 217 }
 218
 219 void b43_radio_set(struct b43_wldev *dev, u16 offset, u16 set)
 220 {
 221         b43_radio_write16(dev, offset,
 222                           b43_radio_read16(dev, offset) | set);
 223 }
 224
 225 void b43_radio_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set)
 226 {
 227         b43_radio_write16(dev, offset,
 228                           (b43_radio_read16(dev, offset) & mask) | set);
 229 }
 230
 231 u16 b43_phy_read(struct b43_wldev *dev, u16 reg)
 232 {
 233         assert_mac_suspended(dev);
 234         dev->phy.writes_counter = 0;
 235         return dev->phy.ops->phy_read(dev, reg);
 236 }
 237
 238 void b43_phy_write(struct b43_wldev *dev, u16 reg, u16 value)
 239 {
 240         assert_mac_suspended(dev);
 241         dev->phy.ops->phy_write(dev, reg, value);
 242         if (++dev->phy.writes_counter == B43_MAX_WRITES_IN_ROW) {
 243                 b43_read16(dev, B43_MMIO_PHY_VER);
 244                 dev->phy.writes_counter = 0;
 245         }
 246 }
 247
 248 void b43_phy_copy(struct b43_wldev *dev, u16 destreg, u16 srcreg)
 249 {
 250         assert_mac_suspended(dev);
 251         dev->phy.ops->phy_write(dev, destreg,
 252                 dev->phy.ops->phy_read(dev, srcreg));
 253 }
 254
 255 void b43_phy_mask(struct b43_wldev *dev, u16 offset, u16 mask)
 256 {
 257         if (dev->phy.ops->phy_maskset) {
 258                 assert_mac_suspended(dev);
 259                 dev->phy.ops->phy_maskset(dev, offset, mask, 0);
 260         } else {
 261                 b43_phy_write(dev, offset,
 262                               b43_phy_read(dev, offset) & mask);
 263         }
 264 }
 265
 266 void b43_phy_set(struct b43_wldev *dev, u16 offset, u16 set)
 267 {
 268         if (dev->phy.ops->phy_maskset) {
 269                 assert_mac_suspended(dev);
 270                 dev->phy.ops->phy_maskset(dev, offset, 0xFFFF, set);
 271         } else {
 272                 b43_phy_write(dev, offset,
 273                               b43_phy_read(dev, offset) | set);
 274         }
 275 }
 276
 277 void b43_phy_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set)
 278 {
 279         if (dev->phy.ops->phy_maskset) {
 280                 assert_mac_suspended(dev);
 281                 dev->phy.ops->phy_maskset(dev, offset, mask, set);
 282         } else {
 283                 b43_phy_write(dev, offset,
 284                               (b43_phy_read(dev, offset) & mask) | set);
 285         }
 286 }
 287
 288 int b43_switch_channel(struct b43_wldev *dev, unsigned int new_channel)
 289 {
 290         struct b43_phy *phy = &(dev->phy);
 291         u16 channelcookie, savedcookie;
 292         int err;
 293
 294         if (new_channel == B43_DEFAULT_CHANNEL)
 295                 new_channel = phy->ops->get_default_chan(dev);
 296
 297         /* First we set the channel radio code to prevent the
 298          * firmware from sending ghost packets.
 299          */
 300         channelcookie = new_channel;
 301         if (b43_current_band(dev->wl) == IEEE80211_BAND_5GHZ)
 302                 channelcookie |= B43_SHM_SH_CHAN_5GHZ;
 303         /* FIXME: set 40Mhz flag if required */
 304         if (0)
 305                 channelcookie |= B43_SHM_SH_CHAN_40MHZ;
 306         savedcookie = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN);
 307         b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN, channelcookie);
 308
 309         /* Now try to switch the PHY hardware channel. */
 310         err = phy->ops->switch_channel(dev, new_channel);
 311         if (err)
 312                 goto err_restore_cookie;
 313
 314         dev->phy.channel = new_channel;
 315         /* Wait for the radio to tune to the channel and stabilize. */
 316         msleep(8);
 317
 318         return 0;
 319
 320 err_restore_cookie:
 321         b43_shm_write16(dev, B43_SHM_SHARED,
 322                         B43_SHM_SH_CHAN, savedcookie);
 323
 324         return err;
 325 }
 326
 327 void b43_software_rfkill(struct b43_wldev *dev, bool blocked)
 328 {
 329         struct b43_phy *phy = &dev->phy;
 330
 331         b43_mac_suspend(dev);
 332         phy->ops->software_rfkill(dev, blocked);
 333         phy->radio_on = !blocked;
 334         b43_mac_enable(dev);
 335 }
 336
 337 /**
 338  * b43_phy_txpower_adjust_work - TX power workqueue.
 339  *
 340  * Workqueue for updating the TX power parameters in hardware.
 341  */
 342 void b43_phy_txpower_adjust_work(struct work_struct *work)
 343 {
 344         struct b43_wl *wl = container_of(work, struct b43_wl,
 345                                          txpower_adjust_work);
 346         struct b43_wldev *dev;
 347
 348         mutex_lock(&wl->mutex);
 349         dev = wl->current_dev;
 350
 351         if (likely(dev && (b43_status(dev) >= B43_STAT_STARTED)))
 352                 dev->phy.ops->adjust_txpower(dev);
 353
 354         mutex_unlock(&wl->mutex);
 355 }
 356
 357 void b43_phy_txpower_check(struct b43_wldev *dev, unsigned int flags)
 358 {
 359         struct b43_phy *phy = &dev->phy;
 360         unsigned long now = jiffies;
 361         enum b43_txpwr_result result;
 362
 363         if (!(flags & B43_TXPWR_IGNORE_TIME)) {
 364                 /* Check if it's time for a TXpower check. */
 365                 if (time_before(now, phy->next_txpwr_check_time))
 366                         return; /* Not yet */
 367         }
 368         /* The next check will be needed in two seconds, or later. */
 369         phy->next_txpwr_check_time = round_jiffies(now + (HZ * 2));
 370
 371         if ((dev->sdev->bus->boardinfo.vendor == SSB_BOARDVENDOR_BCM) &&
 372             (dev->sdev->bus->boardinfo.type == SSB_BOARD_BU4306))
 373                 return; /* No software txpower adjustment needed */
 374
 375         result = phy->ops->recalc_txpower(dev, !!(flags & B43_TXPWR_IGNORE_TSSI));
 376         if (result == B43_TXPWR_RES_DONE)
 377                 return; /* We are done. */
 378         B43_WARN_ON(result != B43_TXPWR_RES_NEED_ADJUST);
 379         B43_WARN_ON(phy->ops->adjust_txpower == NULL);
 380
 381         /* We must adjust the transmission power in hardware.
 382          * Schedule b43_phy_txpower_adjust_work(). */
 383         ieee80211_queue_work(dev->wl->hw, &dev->wl->txpower_adjust_work);
 384 }
 385
 386 int b43_phy_shm_tssi_read(struct b43_wldev *dev, u16 shm_offset)
 387 {
 388         const bool is_ofdm = (shm_offset != B43_SHM_SH_TSSI_CCK);
 389         unsigned int a, b, c, d;
 390         unsigned int average;
 391         u32 tmp;
 392
 393         tmp = b43_shm_read32(dev, B43_SHM_SHARED, shm_offset);
 394         a = tmp & 0xFF;
 395         b = (tmp >> 8) & 0xFF;
 396         c = (tmp >> 16) & 0xFF;
 397         d = (tmp >> 24) & 0xFF;
 398         if (a == 0 || a == B43_TSSI_MAX ||
 399             b == 0 || b == B43_TSSI_MAX ||
 400             c == 0 || c == B43_TSSI_MAX ||
 401             d == 0 || d == B43_TSSI_MAX)
 402                 return -ENOENT;
 403         /* The values are OK. Clear them. */
 404         tmp = B43_TSSI_MAX | (B43_TSSI_MAX << 8) |
 405               (B43_TSSI_MAX << 16) | (B43_TSSI_MAX << 24);
 406         b43_shm_write32(dev, B43_SHM_SHARED, shm_offset, tmp);
 407
 408         if (is_ofdm) {
 409                 a = (a + 32) & 0x3F;
 410                 b = (b + 32) & 0x3F;
 411                 c = (c + 32) & 0x3F;
 412                 d = (d + 32) & 0x3F;
 413         }
 414
 415         /* Get the average of the values with 0.5 added to each value. */
 416         average = (a + b + c + d + 2) / 4;
 417         if (is_ofdm) {
 418                 /* Adjust for CCK-boost */
 419                 if (b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFLO)
 420                     & B43_HF_CCKBOOST)
 421                         average = (average >= 13) ? (average - 13) : 0;
 422         }
 423
 424         return average;
 425 }
 426
 427 void b43_phyop_switch_analog_generic(struct b43_wldev *dev, bool on)
 428 {
 429         b43_write16(dev, B43_MMIO_PHY0, on ? 0 : 0xF4);
 430 }
 431
 432
 433 bool b43_channel_type_is_40mhz(enum nl80211_channel_type channel_type)
 434 {
 435         return (channel_type == NL80211_CHAN_HT40MINUS ||
 436                 channel_type == NL80211_CHAN_HT40PLUS);
 437 }
 438
 439 /* http://bcm-v4.sipsolutions.net/802.11/PHY/Cordic */
 440 struct b43_c32 b43_cordic(int theta)
 441 {
 442         static const u32 arctg[] = {
 443                 2949120, 1740967, 919879, 466945, 234379, 117304,
 444                   58666,   29335,  14668,   7334,   3667,   1833,
 445                     917,     458,    229,    115,     57,     29,
 446         };
 447         u8 i;
 448         s32 tmp;
 449         s8 signx = 1;
 450         u32 angle = 0;
 451         struct b43_c32 ret = { .i = 39797, .q = 0, };
 452
 453         while (theta > (180 << 16))
 454                 theta -= (360 << 16);
 455         while (theta < -(180 << 16))
 456                 theta += (360 << 16);
 457
 458         if (theta > (90 << 16)) {
 459                 theta -= (180 << 16);
 460                 signx = -1;
 461         } else if (theta < -(90 << 16)) {
 462                 theta += (180 << 16);
 463                 signx = -1;
 464         }
 465
 466         for (i = 0; i <= 17; i++) {
 467                 if (theta > angle) {
 468                         tmp = ret.i - (ret.q >> i);
 469                         ret.q += ret.i >> i;
 470                         ret.i = tmp;
 471                         angle += arctg[i];
 472                 } else {
 473                         tmp = ret.i + (ret.q >> i);
 474                         ret.q -= ret.i >> i;
 475                         ret.i = tmp;
 476                         angle -= arctg[i];
 477                 }
 478         }
 479
 480         ret.i *= signx;
 481         ret.q *= signx;
 482
 483         return ret;
 484 }