drivers/net/wireless/brcm80211/brcmsmac/antsel.c

   1 /*
   2  * Copyright (c) 2010 Broadcom Corporation
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/slab.h>
  18 #include <net/mac80211.h>
  19
  20 #include "types.h"
  21 #include "main.h"
  22 #include "phy_shim.h"
  23 #include "antsel.h"
  24 #include "debug.h"
  25
  26 #define ANT_SELCFG_AUTO         0x80    /* bit indicates antenna sel AUTO */
  27 #define ANT_SELCFG_MASK         0x33    /* antenna configuration mask */
  28 #define ANT_SELCFG_TX_UNICAST   0       /* unicast tx antenna configuration */
  29 #define ANT_SELCFG_RX_UNICAST   1       /* unicast rx antenna configuration */
  30 #define ANT_SELCFG_TX_DEF       2       /* default tx antenna configuration */
  31 #define ANT_SELCFG_RX_DEF       3       /* default rx antenna configuration */
  32
  33 /* useful macros */
  34 #define BRCMS_ANTSEL_11N_0(ant) ((((ant) & ANT_SELCFG_MASK) >> 4) & 0xf)
  35 #define BRCMS_ANTSEL_11N_1(ant) (((ant) & ANT_SELCFG_MASK) & 0xf)
  36 #define BRCMS_ANTIDX_11N(ant)   (((BRCMS_ANTSEL_11N_0(ant)) << 2) +\
  37                                 (BRCMS_ANTSEL_11N_1(ant)))
  38 #define BRCMS_ANT_ISAUTO_11N(ant) (((ant) & ANT_SELCFG_AUTO) == ANT_SELCFG_AUTO)
  39 #define BRCMS_ANTSEL_11N(ant)   ((ant) & ANT_SELCFG_MASK)
  40
  41 /* antenna switch */
  42 /* defines for no boardlevel antenna diversity */
  43 #define ANT_SELCFG_DEF_2x2      0x01    /* default antenna configuration */
  44
  45 /* 2x3 antdiv defines and tables for GPIO communication */
  46 #define ANT_SELCFG_NUM_2x3      3
  47 #define ANT_SELCFG_DEF_2x3      0x01    /* default antenna configuration */
  48
  49 /* 2x4 antdiv rev4 defines and tables for GPIO communication */
  50 #define ANT_SELCFG_NUM_2x4      4
  51 #define ANT_SELCFG_DEF_2x4      0x02    /* default antenna configuration */
  52
  53 static const u16 mimo_2x4_div_antselpat_tbl[] = {
  54         0, 0, 0x9, 0xa,         /* ant0: 0 ant1: 2,3 */
  55         0, 0, 0x5, 0x6,         /* ant0: 1 ant1: 2,3 */
  56         0, 0, 0, 0,             /* n.a.              */
  57         0, 0, 0, 0              /* n.a.              */
  58 };
  59
  60 static const u8 mimo_2x4_div_antselid_tbl[16] = {
  61         0, 0, 0, 0, 0, 2, 3, 0,
  62         0, 0, 1, 0, 0, 0, 0, 0  /* pat to antselid */
  63 };
  64
  65 static const u16 mimo_2x3_div_antselpat_tbl[] = {
  66         16, 0, 1, 16,           /* ant0: 0 ant1: 1,2 */
  67         16, 16, 16, 16,         /* n.a.              */
  68         16, 2, 16, 16,          /* ant0: 2 ant1: 1   */
  69         16, 16, 16, 16          /* n.a.              */
  70 };
  71
  72 static const u8 mimo_2x3_div_antselid_tbl[16] = {
  73         0, 1, 2, 0, 0, 0, 0, 0,
  74         0, 0, 0, 0, 0, 0, 0, 0  /* pat to antselid */
  75 };
  76
  77 /* boardlevel antenna selection: init antenna selection structure */
  78 static void
  79 brcms_c_antsel_init_cfg(struct antsel_info *asi, struct brcms_antselcfg *antsel,
  80                     bool auto_sel)
  81 {
  82         if (asi->antsel_type == ANTSEL_2x3) {
  83                 u8 antcfg_def = ANT_SELCFG_DEF_2x3 |
  84                     ((asi->antsel_avail && auto_sel) ? ANT_SELCFG_AUTO : 0);
  85                 antsel->ant_config[ANT_SELCFG_TX_DEF] = antcfg_def;
  86                 antsel->ant_config[ANT_SELCFG_TX_UNICAST] = antcfg_def;
  87                 antsel->ant_config[ANT_SELCFG_RX_DEF] = antcfg_def;
  88                 antsel->ant_config[ANT_SELCFG_RX_UNICAST] = antcfg_def;
  89                 antsel->num_antcfg = ANT_SELCFG_NUM_2x3;
  90
  91         } else if (asi->antsel_type == ANTSEL_2x4) {
  92
  93                 antsel->ant_config[ANT_SELCFG_TX_DEF] = ANT_SELCFG_DEF_2x4;
  94                 antsel->ant_config[ANT_SELCFG_TX_UNICAST] = ANT_SELCFG_DEF_2x4;
  95                 antsel->ant_config[ANT_SELCFG_RX_DEF] = ANT_SELCFG_DEF_2x4;
  96                 antsel->ant_config[ANT_SELCFG_RX_UNICAST] = ANT_SELCFG_DEF_2x4;
  97                 antsel->num_antcfg = ANT_SELCFG_NUM_2x4;
  98
  99         } else {                /* no antenna selection available */
 100
 101                 antsel->ant_config[ANT_SELCFG_TX_DEF] = ANT_SELCFG_DEF_2x2;
 102                 antsel->ant_config[ANT_SELCFG_TX_UNICAST] = ANT_SELCFG_DEF_2x2;
 103                 antsel->ant_config[ANT_SELCFG_RX_DEF] = ANT_SELCFG_DEF_2x2;
 104                 antsel->ant_config[ANT_SELCFG_RX_UNICAST] = ANT_SELCFG_DEF_2x2;
 105                 antsel->num_antcfg = 0;
 106         }
 107 }
 108
 109 struct antsel_info *brcms_c_antsel_attach(struct brcms_c_info *wlc)
 110 {
 111         struct antsel_info *asi;
 112         struct ssb_sprom *sprom = &wlc->hw->d11core->bus->sprom;
 113
 114         asi = kzalloc(sizeof(struct antsel_info), GFP_ATOMIC);
 115         if (!asi)
 116                 return NULL;
 117
 118         asi->wlc = wlc;
 119         asi->pub = wlc->pub;
 120         asi->antsel_type = ANTSEL_NA;
 121         asi->antsel_avail = false;
 122         asi->antsel_antswitch = sprom->antswitch;
 123
 124         if ((asi->pub->sromrev >= 4) && (asi->antsel_antswitch != 0)) {
 125                 switch (asi->antsel_antswitch) {
 126                 case ANTSWITCH_TYPE_1:
 127                 case ANTSWITCH_TYPE_2:
 128                 case ANTSWITCH_TYPE_3:
 129                         /* 4321/2 board with 2x3 switch logic */
 130                         asi->antsel_type = ANTSEL_2x3;
 131                         /* Antenna selection availability */
 132                         if ((sprom->ant_available_bg == 7) ||
 133                             (sprom->ant_available_a == 7)) {
 134                                 asi->antsel_avail = true;
 135                         } else if (
 136                                 sprom->ant_available_bg == 3 ||
 137                                 sprom->ant_available_a == 3) {
 138                                 asi->antsel_avail = false;
 139                         } else {
 140                                 asi->antsel_avail = false;
 141                                 brcms_err(wlc->hw->d11core,
 142                                           "antsel_attach: 2o3 "
 143                                           "board cfg invalid\n");
 144                         }
 145
 146                         break;
 147                 default:
 148                         break;
 149                 }
 150         } else if ((asi->pub->sromrev == 4) &&
 151                    (sprom->ant_available_bg == 7) &&
 152                    (sprom->ant_available_a == 0)) {
 153                 /* hack to match old 4321CB2 cards with 2of3 antenna switch */
 154                 asi->antsel_type = ANTSEL_2x3;
 155                 asi->antsel_avail = true;
 156         } else if (asi->pub->boardflags2 & BFL2_2X4_DIV) {
 157                 asi->antsel_type = ANTSEL_2x4;
 158                 asi->antsel_avail = true;
 159         }
 160
 161         /* Set the antenna selection type for the low driver */
 162         brcms_b_antsel_type_set(wlc->hw, asi->antsel_type);
 163
 164         /* Init (auto/manual) antenna selection */
 165         brcms_c_antsel_init_cfg(asi, &asi->antcfg_11n, true);
 166         brcms_c_antsel_init_cfg(asi, &asi->antcfg_cur, true);
 167
 168         return asi;
 169 }
 170
 171 void brcms_c_antsel_detach(struct antsel_info *asi)
 172 {
 173         kfree(asi);
 174 }
 175
 176 /*
 177  * boardlevel antenna selection:
 178  *   convert ant_cfg to mimo_antsel (ucode interface)
 179  */
 180 static u16 brcms_c_antsel_antcfg2antsel(struct antsel_info *asi, u8 ant_cfg)
 181 {
 182         u8 idx = BRCMS_ANTIDX_11N(BRCMS_ANTSEL_11N(ant_cfg));
 183         u16 mimo_antsel = 0;
 184
 185         if (asi->antsel_type == ANTSEL_2x4) {
 186                 /* 2x4 antenna diversity board, 4 cfgs: 0-2 0-3 1-2 1-3 */
 187                 mimo_antsel = (mimo_2x4_div_antselpat_tbl[idx] & 0xf);
 188                 return mimo_antsel;
 189
 190         } else if (asi->antsel_type == ANTSEL_2x3) {
 191                 /* 2x3 antenna selection, 3 cfgs: 0-1 0-2 2-1 */
 192                 mimo_antsel = (mimo_2x3_div_antselpat_tbl[idx] & 0xf);
 193                 return mimo_antsel;
 194         }
 195
 196         return mimo_antsel;
 197 }
 198
 199 /* boardlevel antenna selection: ucode interface control */
 200 static int brcms_c_antsel_cfgupd(struct antsel_info *asi,
 201                                  struct brcms_antselcfg *antsel)
 202 {
 203         struct brcms_c_info *wlc = asi->wlc;
 204         u8 ant_cfg;
 205         u16 mimo_antsel;
 206
 207         /* 1) Update TX antconfig for all frames that are not unicast data
 208          *    (aka default TX)
 209          */
 210         ant_cfg = antsel->ant_config[ANT_SELCFG_TX_DEF];
 211         mimo_antsel = brcms_c_antsel_antcfg2antsel(asi, ant_cfg);
 212         brcms_b_write_shm(wlc->hw, M_MIMO_ANTSEL_TXDFLT, mimo_antsel);
 213         /*
 214          * Update driver stats for currently selected
 215          * default tx/rx antenna config
 216          */
 217         asi->antcfg_cur.ant_config[ANT_SELCFG_TX_DEF] = ant_cfg;
 218
 219         /* 2) Update RX antconfig for all frames that are not unicast data
 220          *    (aka default RX)
 221          */
 222         ant_cfg = antsel->ant_config[ANT_SELCFG_RX_DEF];
 223         mimo_antsel = brcms_c_antsel_antcfg2antsel(asi, ant_cfg);
 224         brcms_b_write_shm(wlc->hw, M_MIMO_ANTSEL_RXDFLT, mimo_antsel);
 225         /*
 226          * Update driver stats for currently selected
 227          * default tx/rx antenna config
 228          */
 229         asi->antcfg_cur.ant_config[ANT_SELCFG_RX_DEF] = ant_cfg;
 230
 231         return 0;
 232 }
 233
 234 void brcms_c_antsel_init(struct antsel_info *asi)
 235 {
 236         if ((asi->antsel_type == ANTSEL_2x3) ||
 237             (asi->antsel_type == ANTSEL_2x4))
 238                 brcms_c_antsel_cfgupd(asi, &asi->antcfg_11n);
 239 }
 240
 241 /* boardlevel antenna selection: convert id to ant_cfg */
 242 static u8 brcms_c_antsel_id2antcfg(struct antsel_info *asi, u8 id)
 243 {
 244         u8 antcfg = ANT_SELCFG_DEF_2x2;
 245
 246         if (asi->antsel_type == ANTSEL_2x4) {
 247                 /* 2x4 antenna diversity board, 4 cfgs: 0-2 0-3 1-2 1-3 */
 248                 antcfg = (((id & 0x2) << 3) | ((id & 0x1) + 2));
 249                 return antcfg;
 250
 251         } else if (asi->antsel_type == ANTSEL_2x3) {
 252                 /* 2x3 antenna selection, 3 cfgs: 0-1 0-2 2-1 */
 253                 antcfg = (((id & 0x02) << 4) | ((id & 0x1) + 1));
 254                 return antcfg;
 255         }
 256
 257         return antcfg;
 258 }
 259
 260 void
 261 brcms_c_antsel_antcfg_get(struct antsel_info *asi, bool usedef, bool sel,
 262                       u8 antselid, u8 fbantselid, u8 *antcfg,
 263                       u8 *fbantcfg)
 264 {
 265         u8 ant;
 266
 267         /* if use default, assign it and return */
 268         if (usedef) {
 269                 *antcfg = asi->antcfg_11n.ant_config[ANT_SELCFG_TX_DEF];
 270                 *fbantcfg = *antcfg;
 271                 return;
 272         }
 273
 274         if (!sel) {
 275                 *antcfg = asi->antcfg_11n.ant_config[ANT_SELCFG_TX_UNICAST];
 276                 *fbantcfg = *antcfg;
 277
 278         } else {
 279                 ant = asi->antcfg_11n.ant_config[ANT_SELCFG_TX_UNICAST];
 280                 if ((ant & ANT_SELCFG_AUTO) == ANT_SELCFG_AUTO) {
 281                         *antcfg = brcms_c_antsel_id2antcfg(asi, antselid);
 282                         *fbantcfg = brcms_c_antsel_id2antcfg(asi, fbantselid);
 283                 } else {
 284                         *antcfg =
 285                             asi->antcfg_11n.ant_config[ANT_SELCFG_TX_UNICAST];
 286                         *fbantcfg = *antcfg;
 287                 }
 288         }
 289         return;
 290 }
 291
 292 /* boardlevel antenna selection: convert mimo_antsel (ucode interface) to id */
 293 u8 brcms_c_antsel_antsel2id(struct antsel_info *asi, u16 antsel)
 294 {
 295         u8 antselid = 0;
 296
 297         if (asi->antsel_type == ANTSEL_2x4) {
 298                 /* 2x4 antenna diversity board, 4 cfgs: 0-2 0-3 1-2 1-3 */
 299                 antselid = mimo_2x4_div_antselid_tbl[(antsel & 0xf)];
 300                 return antselid;
 301
 302         } else if (asi->antsel_type == ANTSEL_2x3) {
 303                 /* 2x3 antenna selection, 3 cfgs: 0-1 0-2 2-1 */
 304                 antselid = mimo_2x3_div_antselid_tbl[(antsel & 0xf)];
 305                 return antselid;
 306         }
 307
 308         return antselid;
 309 }