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 = 1;
 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 = 0;
 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 = 1;
 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 = 0;
 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 u16 b43_phy_read(struct b43_wldev *dev, u16 reg)
 244 {
 245         assert_mac_suspended(dev);
 246         dev->phy.writes_counter = 0;
 247         return dev->phy.ops->phy_read(dev, reg);
 248 }
 249
 250 void b43_phy_write(struct b43_wldev *dev, u16 reg, u16 value)
 251 {
 252         assert_mac_suspended(dev);
 253         dev->phy.ops->phy_write(dev, reg, value);
 254         if (++dev->phy.writes_counter == B43_MAX_WRITES_IN_ROW) {
 255                 b43_read16(dev, B43_MMIO_PHY_VER);
 256                 dev->phy.writes_counter = 0;
 257         }
 258 }
 259
 260 void b43_phy_copy(struct b43_wldev *dev, u16 destreg, u16 srcreg)
 261 {
 262         assert_mac_suspended(dev);
 263         dev->phy.ops->phy_write(dev, destreg,
 264                 dev->phy.ops->phy_read(dev, srcreg));
 265 }
 266
 267 void b43_phy_mask(struct b43_wldev *dev, u16 offset, u16 mask)
 268 {
 269         if (dev->phy.ops->phy_maskset) {
 270                 assert_mac_suspended(dev);
 271                 dev->phy.ops->phy_maskset(dev, offset, mask, 0);
 272         } else {
 273                 b43_phy_write(dev, offset,
 274                               b43_phy_read(dev, offset) & mask);
 275         }
 276 }
 277
 278 void b43_phy_set(struct b43_wldev *dev, u16 offset, u16 set)
 279 {
 280         if (dev->phy.ops->phy_maskset) {
 281                 assert_mac_suspended(dev);
 282                 dev->phy.ops->phy_maskset(dev, offset, 0xFFFF, set);
 283         } else {
 284                 b43_phy_write(dev, offset,
 285                               b43_phy_read(dev, offset) | set);
 286         }
 287 }
 288
 289 void b43_phy_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set)
 290 {
 291         if (dev->phy.ops->phy_maskset) {
 292                 assert_mac_suspended(dev);
 293                 dev->phy.ops->phy_maskset(dev, offset, mask, set);
 294         } else {
 295                 b43_phy_write(dev, offset,
 296                               (b43_phy_read(dev, offset) & mask) | set);
 297         }
 298 }
 299
 300 int b43_switch_channel(struct b43_wldev *dev, unsigned int new_channel)
 301 {
 302         struct b43_phy *phy = &(dev->phy);
 303         u16 channelcookie, savedcookie;
 304         int err;
 305
 306         if (new_channel == B43_DEFAULT_CHANNEL)
 307                 new_channel = phy->ops->get_default_chan(dev);
 308
 309         /* First we set the channel radio code to prevent the
 310          * firmware from sending ghost packets.
 311          */
 312         channelcookie = new_channel;
 313         if (b43_current_band(dev->wl) == IEEE80211_BAND_5GHZ)
 314                 channelcookie |= B43_SHM_SH_CHAN_5GHZ;
 315         /* FIXME: set 40Mhz flag if required */
 316         if (0)
 317                 channelcookie |= B43_SHM_SH_CHAN_40MHZ;
 318         savedcookie = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN);
 319         b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN, channelcookie);
 320
 321         /* Now try to switch the PHY hardware channel. */
 322         err = phy->ops->switch_channel(dev, new_channel);
 323         if (err)
 324                 goto err_restore_cookie;
 325
 326         dev->phy.channel = new_channel;
 327         /* Wait for the radio to tune to the channel and stabilize. */
 328         msleep(8);
 329
 330         return 0;
 331
 332 err_restore_cookie:
 333         b43_shm_write16(dev, B43_SHM_SHARED,
 334                         B43_SHM_SH_CHAN, savedcookie);
 335
 336         return err;
 337 }
 338
 339 void b43_software_rfkill(struct b43_wldev *dev, bool blocked)
 340 {
 341         struct b43_phy *phy = &dev->phy;
 342
 343         b43_mac_suspend(dev);
 344         phy->ops->software_rfkill(dev, blocked);
 345         phy->radio_on = !blocked;
 346         b43_mac_enable(dev);
 347 }
 348
 349 /**
 350  * b43_phy_txpower_adjust_work - TX power workqueue.
 351  *
 352  * Workqueue for updating the TX power parameters in hardware.
 353  */
 354 void b43_phy_txpower_adjust_work(struct work_struct *work)
 355 {
 356         struct b43_wl *wl = container_of(work, struct b43_wl,
 357                                          txpower_adjust_work);
 358         struct b43_wldev *dev;
 359
 360         mutex_lock(&wl->mutex);
 361         dev = wl->current_dev;
 362
 363         if (likely(dev && (b43_status(dev) >= B43_STAT_STARTED)))
 364                 dev->phy.ops->adjust_txpower(dev);
 365
 366         mutex_unlock(&wl->mutex);
 367 }
 368
 369 void b43_phy_txpower_check(struct b43_wldev *dev, unsigned int flags)
 370 {
 371         struct b43_phy *phy = &dev->phy;
 372         unsigned long now = jiffies;
 373         enum b43_txpwr_result result;
 374
 375         if (!(flags & B43_TXPWR_IGNORE_TIME)) {
 376                 /* Check if it's time for a TXpower check. */
 377                 if (time_before(now, phy->next_txpwr_check_time))
 378                         return; /* Not yet */
 379         }
 380         /* The next check will be needed in two seconds, or later. */
 381         phy->next_txpwr_check_time = round_jiffies(now + (HZ * 2));
 382
 383         if ((dev->dev->board_vendor == SSB_BOARDVENDOR_BCM) &&
 384             (dev->dev->board_type == SSB_BOARD_BU4306))
 385                 return; /* No software txpower adjustment needed */
 386
 387         result = phy->ops->recalc_txpower(dev, !!(flags & B43_TXPWR_IGNORE_TSSI));
 388         if (result == B43_TXPWR_RES_DONE)
 389                 return; /* We are done. */
 390         B43_WARN_ON(result != B43_TXPWR_RES_NEED_ADJUST);
 391         B43_WARN_ON(phy->ops->adjust_txpower == NULL);
 392
 393         /* We must adjust the transmission power in hardware.
 394          * Schedule b43_phy_txpower_adjust_work(). */
 395         ieee80211_queue_work(dev->wl->hw, &dev->wl->txpower_adjust_work);
 396 }
 397
 398 int b43_phy_shm_tssi_read(struct b43_wldev *dev, u16 shm_offset)
 399 {
 400         const bool is_ofdm = (shm_offset != B43_SHM_SH_TSSI_CCK);
 401         unsigned int a, b, c, d;
 402         unsigned int average;
 403         u32 tmp;
 404
 405         tmp = b43_shm_read32(dev, B43_SHM_SHARED, shm_offset);
 406         a = tmp & 0xFF;
 407         b = (tmp >> 8) & 0xFF;
 408         c = (tmp >> 16) & 0xFF;
 409         d = (tmp >> 24) & 0xFF;
 410         if (a == 0 || a == B43_TSSI_MAX ||
 411             b == 0 || b == B43_TSSI_MAX ||
 412             c == 0 || c == B43_TSSI_MAX ||
 413             d == 0 || d == B43_TSSI_MAX)
 414                 return -ENOENT;
 415         /* The values are OK. Clear them. */
 416         tmp = B43_TSSI_MAX | (B43_TSSI_MAX << 8) |
 417               (B43_TSSI_MAX << 16) | (B43_TSSI_MAX << 24);
 418         b43_shm_write32(dev, B43_SHM_SHARED, shm_offset, tmp);
 419
 420         if (is_ofdm) {
 421                 a = (a + 32) & 0x3F;
 422                 b = (b + 32) & 0x3F;
 423                 c = (c + 32) & 0x3F;
 424                 d = (d + 32) & 0x3F;
 425         }
 426
 427         /* Get the average of the values with 0.5 added to each value. */
 428         average = (a + b + c + d + 2) / 4;
 429         if (is_ofdm) {
 430                 /* Adjust for CCK-boost */
 431                 if (b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFLO)
 432                     & B43_HF_CCKBOOST)
 433                         average = (average >= 13) ? (average - 13) : 0;
 434         }
 435
 436         return average;
 437 }
 438
 439 void b43_phyop_switch_analog_generic(struct b43_wldev *dev, bool on)
 440 {
 441         b43_write16(dev, B43_MMIO_PHY0, on ? 0 : 0xF4);
 442 }
 443
 444
 445 bool b43_channel_type_is_40mhz(enum nl80211_channel_type channel_type)
 446 {
 447         return (channel_type == NL80211_CHAN_HT40MINUS ||
 448                 channel_type == NL80211_CHAN_HT40PLUS);
 449 }
 450
 451 /* http://bcm-v4.sipsolutions.net/802.11/PHY/Cordic */
 452 struct b43_c32 b43_cordic(int theta)
 453 {
 454         static const u32 arctg[] = {
 455                 2949120, 1740967, 919879, 466945, 234379, 117304,
 456                   58666,   29335,  14668,   7334,   3667,   1833,
 457                     917,     458,    229,    115,     57,     29,
 458         };
 459         u8 i;
 460         s32 tmp;
 461         s8 signx = 1;
 462         u32 angle = 0;
 463         struct b43_c32 ret = { .i = 39797, .q = 0, };
 464
 465         while (theta > (180 << 16))
 466                 theta -= (360 << 16);
 467         while (theta < -(180 << 16))
 468                 theta += (360 << 16);
 469
 470         if (theta > (90 << 16)) {
 471                 theta -= (180 << 16);
 472                 signx = -1;
 473         } else if (theta < -(90 << 16)) {
 474                 theta += (180 << 16);
 475                 signx = -1;
 476         }
 477
 478         for (i = 0; i <= 17; i++) {
 479                 if (theta > angle) {
 480                         tmp = ret.i - (ret.q >> i);
 481                         ret.q += ret.i >> i;
 482                         ret.i = tmp;
 483                         angle += arctg[i];
 484                 } else {
 485                         tmp = ret.i + (ret.q >> i);
 486                         ret.q -= ret.i >> i;
 487                         ret.i = tmp;
 488                         angle -= arctg[i];
 489                 }
 490         }
 491
 492         ret.i *= signx;
 493         ret.q *= signx;
 494
 495         return ret;
 496 }