drivers/net/wireless/broadcom/b43/ppr.c

   1 /*
   2  * Broadcom B43 wireless driver
   3  * PPR (Power Per Rate) management
   4  *
   5  * Copyright (c) 2014 Rafał Miłecki <zajec5@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include "ppr.h"
  19 #include "b43.h"
  20
  21 #define ppr_for_each_entry(ppr, i, entry)                               \
  22         for (i = 0, entry = &(ppr)->__all_rates[i];                     \
  23              i < B43_PPR_RATES_NUM;                                     \
  24              i++, entry++)
  25
  26 void b43_ppr_clear(struct b43_wldev *dev, struct b43_ppr *ppr)
  27 {
  28         memset(ppr, 0, sizeof(*ppr));
  29
  30         /* Compile-time PPR check */
  31         BUILD_BUG_ON(sizeof(struct b43_ppr) != B43_PPR_RATES_NUM * sizeof(u8));
  32 }
  33
  34 void b43_ppr_add(struct b43_wldev *dev, struct b43_ppr *ppr, int diff)
  35 {
  36         int i;
  37         u8 *rate;
  38
  39         ppr_for_each_entry(ppr, i, rate) {
  40                 *rate = clamp_val(*rate + diff, 0, 127);
  41         }
  42 }
  43
  44 void b43_ppr_apply_max(struct b43_wldev *dev, struct b43_ppr *ppr, u8 max)
  45 {
  46         int i;
  47         u8 *rate;
  48
  49         ppr_for_each_entry(ppr, i, rate) {
  50                 *rate = min(*rate, max);
  51         }
  52 }
  53
  54 void b43_ppr_apply_min(struct b43_wldev *dev, struct b43_ppr *ppr, u8 min)
  55 {
  56         int i;
  57         u8 *rate;
  58
  59         ppr_for_each_entry(ppr, i, rate) {
  60                 *rate = max(*rate, min);
  61         }
  62 }
  63
  64 u8 b43_ppr_get_max(struct b43_wldev *dev, struct b43_ppr *ppr)
  65 {
  66         u8 res = 0;
  67         int i;
  68         u8 *rate;
  69
  70         ppr_for_each_entry(ppr, i, rate) {
  71                 res = max(*rate, res);
  72         }
  73
  74         return res;
  75 }
  76
  77 bool b43_ppr_load_max_from_sprom(struct b43_wldev *dev, struct b43_ppr *ppr,
  78                                  enum b43_band band)
  79 {
  80         struct b43_ppr_rates *rates = &ppr->rates;
  81         struct ssb_sprom *sprom = dev->dev->bus_sprom;
  82         struct b43_phy *phy = &dev->phy;
  83         u8 maxpwr, off;
  84         u32 sprom_ofdm_po;
  85         u16 *sprom_mcs_po;
  86         u8 extra_cdd_po, extra_stbc_po;
  87         int i;
  88
  89         switch (band) {
  90         case B43_BAND_2G:
  91                 maxpwr = min(sprom->core_pwr_info[0].maxpwr_2g,
  92                              sprom->core_pwr_info[1].maxpwr_2g);
  93                 sprom_ofdm_po = sprom->ofdm2gpo;
  94                 sprom_mcs_po = sprom->mcs2gpo;
  95                 extra_cdd_po = (sprom->cddpo >> 0) & 0xf;
  96                 extra_stbc_po = (sprom->stbcpo >> 0) & 0xf;
  97                 break;
  98         case B43_BAND_5G_LO:
  99                 maxpwr = min(sprom->core_pwr_info[0].maxpwr_5gl,
 100                              sprom->core_pwr_info[1].maxpwr_5gl);
 101                 sprom_ofdm_po = sprom->ofdm5glpo;
 102                 sprom_mcs_po = sprom->mcs5glpo;
 103                 extra_cdd_po = (sprom->cddpo >> 8) & 0xf;
 104                 extra_stbc_po = (sprom->stbcpo >> 8) & 0xf;
 105                 break;
 106         case B43_BAND_5G_MI:
 107                 maxpwr = min(sprom->core_pwr_info[0].maxpwr_5g,
 108                              sprom->core_pwr_info[1].maxpwr_5g);
 109                 sprom_ofdm_po = sprom->ofdm5gpo;
 110                 sprom_mcs_po = sprom->mcs5gpo;
 111                 extra_cdd_po = (sprom->cddpo >> 4) & 0xf;
 112                 extra_stbc_po = (sprom->stbcpo >> 4) & 0xf;
 113                 break;
 114         case B43_BAND_5G_HI:
 115                 maxpwr = min(sprom->core_pwr_info[0].maxpwr_5gh,
 116                              sprom->core_pwr_info[1].maxpwr_5gh);
 117                 sprom_ofdm_po = sprom->ofdm5ghpo;
 118                 sprom_mcs_po = sprom->mcs5ghpo;
 119                 extra_cdd_po = (sprom->cddpo >> 12) & 0xf;
 120                 extra_stbc_po = (sprom->stbcpo >> 12) & 0xf;
 121                 break;
 122         default:
 123                 WARN_ON_ONCE(1);
 124                 return false;
 125         }
 126
 127         if (band == B43_BAND_2G) {
 128                 for (i = 0; i < 4; i++) {
 129                         off = ((sprom->cck2gpo >> (i * 4)) & 0xf) * 2;
 130                         rates->cck[i] = maxpwr - off;
 131                 }
 132         }
 133
 134         /* OFDM */
 135         for (i = 0; i < 8; i++) {
 136                 off = ((sprom_ofdm_po >> (i * 4)) & 0xf) * 2;
 137                 rates->ofdm[i] = maxpwr - off;
 138         }
 139
 140         /* MCS 20 SISO */
 141         rates->mcs_20[0] = rates->ofdm[0];
 142         rates->mcs_20[1] = rates->ofdm[2];
 143         rates->mcs_20[2] = rates->ofdm[3];
 144         rates->mcs_20[3] = rates->ofdm[4];
 145         rates->mcs_20[4] = rates->ofdm[5];
 146         rates->mcs_20[5] = rates->ofdm[6];
 147         rates->mcs_20[6] = rates->ofdm[7];
 148         rates->mcs_20[7] = rates->ofdm[7];
 149
 150         /* MCS 20 CDD */
 151         for (i = 0; i < 4; i++) {
 152                 off = ((sprom_mcs_po[0] >> (i * 4)) & 0xf) * 2;
 153                 rates->mcs_20_cdd[i] = maxpwr - off;
 154                 if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
 155                         rates->mcs_20_cdd[i] -= extra_cdd_po;
 156         }
 157         for (i = 0; i < 4; i++) {
 158                 off = ((sprom_mcs_po[1] >> (i * 4)) & 0xf) * 2;
 159                 rates->mcs_20_cdd[4 + i] = maxpwr - off;
 160                 if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
 161                         rates->mcs_20_cdd[4 + i] -= extra_cdd_po;
 162         }
 163
 164         /* OFDM 20 CDD */
 165         rates->ofdm_20_cdd[0] = rates->mcs_20_cdd[0];
 166         rates->ofdm_20_cdd[1] = rates->mcs_20_cdd[0];
 167         rates->ofdm_20_cdd[2] = rates->mcs_20_cdd[1];
 168         rates->ofdm_20_cdd[3] = rates->mcs_20_cdd[2];
 169         rates->ofdm_20_cdd[4] = rates->mcs_20_cdd[3];
 170         rates->ofdm_20_cdd[5] = rates->mcs_20_cdd[4];
 171         rates->ofdm_20_cdd[6] = rates->mcs_20_cdd[5];
 172         rates->ofdm_20_cdd[7] = rates->mcs_20_cdd[6];
 173
 174         /* MCS 20 STBC */
 175         for (i = 0; i < 4; i++) {
 176                 off = ((sprom_mcs_po[0] >> (i * 4)) & 0xf) * 2;
 177                 rates->mcs_20_stbc[i] = maxpwr - off;
 178                 if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
 179                         rates->mcs_20_stbc[i] -= extra_stbc_po;
 180         }
 181         for (i = 0; i < 4; i++) {
 182                 off = ((sprom_mcs_po[1] >> (i * 4)) & 0xf) * 2;
 183                 rates->mcs_20_stbc[4 + i] = maxpwr - off;
 184                 if (phy->type == B43_PHYTYPE_N && phy->rev >= 3)
 185                         rates->mcs_20_stbc[4 + i] -= extra_stbc_po;
 186         }
 187
 188         /* MCS 20 SDM */
 189         for (i = 0; i < 4; i++) {
 190                 off = ((sprom_mcs_po[2] >> (i * 4)) & 0xf) * 2;
 191                 rates->mcs_20_sdm[i] = maxpwr - off;
 192         }
 193         for (i = 0; i < 4; i++) {
 194                 off = ((sprom_mcs_po[3] >> (i * 4)) & 0xf) * 2;
 195                 rates->mcs_20_sdm[4 + i] = maxpwr - off;
 196         }
 197
 198         return true;
 199 }