drivers/net/wireless/brcm80211/brcmsmac/rate.h

   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 #ifndef _BRCM_RATE_H_
  18 #define _BRCM_RATE_H_
  19
  20 #include "types.h"
  21 #include "d11.h"
  22 #include "phy_hal.h"
  23
  24 extern const u8 rate_info[];
  25 extern const struct brcms_c_rateset cck_ofdm_mimo_rates;
  26 extern const struct brcms_c_rateset ofdm_mimo_rates;
  27 extern const struct brcms_c_rateset cck_ofdm_rates;
  28 extern const struct brcms_c_rateset ofdm_rates;
  29 extern const struct brcms_c_rateset cck_rates;
  30 extern const struct brcms_c_rateset gphy_legacy_rates;
  31 extern const struct brcms_c_rateset rate_limit_1_2;
  32
  33 struct brcms_mcs_info {
  34         /* phy rate in kbps [20Mhz] */
  35         u32 phy_rate_20;
  36         /* phy rate in kbps [40Mhz] */
  37         u32 phy_rate_40;
  38         /* phy rate in kbps [20Mhz] with SGI */
  39         u32 phy_rate_20_sgi;
  40         /* phy rate in kbps [40Mhz] with SGI */
  41         u32 phy_rate_40_sgi;
  42         /* phy ctl byte 3, code rate, modulation type, # of streams */
  43         u8 tx_phy_ctl3;
  44         /* matching legacy ofdm rate in 500bkps */
  45         u8 leg_ofdm;
  46 };
  47
  48 #define BRCMS_MAXMCS    32      /* max valid mcs index */
  49 #define MCS_TABLE_SIZE  33      /* Number of mcs entries in the table */
  50 extern const struct brcms_mcs_info mcs_table[];
  51
  52 #define MCS_TXS_MASK    0xc0    /* num tx streams - 1 bit mask */
  53 #define MCS_TXS_SHIFT   6       /* num tx streams - 1 bit shift */
  54
  55 /* returns num tx streams - 1 */
  56 static inline u8 mcs_2_txstreams(u8 mcs)
  57 {
  58         return (mcs_table[mcs].tx_phy_ctl3 & MCS_TXS_MASK) >> MCS_TXS_SHIFT;
  59 }
  60
  61 static inline uint mcs_2_rate(u8 mcs, bool is40, bool sgi)
  62 {
  63         if (sgi) {
  64                 if (is40)
  65                         return mcs_table[mcs].phy_rate_40_sgi;
  66                 return mcs_table[mcs].phy_rate_20_sgi;
  67         }
  68         if (is40)
  69                 return mcs_table[mcs].phy_rate_40;
  70
  71         return mcs_table[mcs].phy_rate_20;
  72 }
  73
  74 /* Macro to use the rate_info table */
  75 #define BRCMS_RATE_MASK_FULL 0xff /* Rate value mask with basic rate flag */
  76
  77 /*
  78  * rate spec : holds rate and mode specific information required to generate a
  79  * tx frame. Legacy CCK and OFDM information is held in the same manner as was
  80  * done in the past (in the lower byte) the upper 3 bytes primarily hold MIMO
  81  * specific information
  82  */
  83
  84 /* rate spec bit fields */
  85
  86 /* Either 500Kbps units or MIMO MCS idx */
  87 #define RSPEC_RATE_MASK         0x0000007F
  88 /* mimo MCS is stored in RSPEC_RATE_MASK */
  89 #define RSPEC_MIMORATE          0x08000000
  90 /* mimo bw mask */
  91 #define RSPEC_BW_MASK           0x00000700
  92 /* mimo bw shift */
  93 #define RSPEC_BW_SHIFT          8
  94 /* mimo Space/Time/Frequency mode mask */
  95 #define RSPEC_STF_MASK          0x00003800
  96 /* mimo Space/Time/Frequency mode shift */
  97 #define RSPEC_STF_SHIFT         11
  98 /* mimo coding type mask */
  99 #define RSPEC_CT_MASK           0x0000C000
 100 /* mimo coding type shift */
 101 #define RSPEC_CT_SHIFT          14
 102 /* mimo num STC streams per PLCP defn. */
 103 #define RSPEC_STC_MASK          0x00300000
 104 /* mimo num STC streams per PLCP defn. */
 105 #define RSPEC_STC_SHIFT         20
 106 /* mimo bit indicates adv coding in use */
 107 #define RSPEC_LDPC_CODING       0x00400000
 108 /* mimo bit indicates short GI in use */
 109 #define RSPEC_SHORT_GI          0x00800000
 110 /* bit indicates override both rate & mode */
 111 #define RSPEC_OVERRIDE          0x80000000
 112 /* bit indicates override rate only */
 113 #define RSPEC_OVERRIDE_MCS_ONLY 0x40000000
 114
 115 static inline bool rspec_active(u32 rspec)
 116 {
 117         return rspec & (RSPEC_RATE_MASK | RSPEC_MIMORATE);
 118 }
 119
 120 static inline u8 rspec_phytxbyte2(u32 rspec)
 121 {
 122         return (rspec & 0xff00) >> 8;
 123 }
 124
 125 static inline u32 rspec_get_bw(u32 rspec)
 126 {
 127         return (rspec & RSPEC_BW_MASK) >> RSPEC_BW_SHIFT;
 128 }
 129
 130 static inline bool rspec_issgi(u32 rspec)
 131 {
 132         return (rspec & RSPEC_SHORT_GI) == RSPEC_SHORT_GI;
 133 }
 134
 135 static inline bool rspec_is40mhz(u32 rspec)
 136 {
 137         u32 bw = rspec_get_bw(rspec);
 138
 139         return bw == PHY_TXC1_BW_40MHZ || bw == PHY_TXC1_BW_40MHZ_DUP;
 140 }
 141
 142 static inline uint rspec2rate(u32 rspec)
 143 {
 144         if (rspec & RSPEC_MIMORATE)
 145                 return mcs_2_rate(rspec & RSPEC_RATE_MASK, rspec_is40mhz(rspec),
 146                                   rspec_issgi(rspec));
 147         return rspec & RSPEC_RATE_MASK;
 148 }
 149
 150 static inline u8 rspec_mimoplcp3(u32 rspec)
 151 {
 152         return (rspec & 0xf00000) >> 16;
 153 }
 154
 155 static inline bool plcp3_issgi(u8 plcp)
 156 {
 157         return (plcp & (RSPEC_SHORT_GI >> 16)) != 0;
 158 }
 159
 160 static inline uint rspec_stc(u32 rspec)
 161 {
 162         return (rspec & RSPEC_STC_MASK) >> RSPEC_STC_SHIFT;
 163 }
 164
 165 static inline uint rspec_stf(u32 rspec)
 166 {
 167         return (rspec & RSPEC_STF_MASK) >> RSPEC_STF_SHIFT;
 168 }
 169
 170 static inline bool is_mcs_rate(u32 ratespec)
 171 {
 172         return (ratespec & RSPEC_MIMORATE) != 0;
 173 }
 174
 175 static inline bool is_ofdm_rate(u32 ratespec)
 176 {
 177         return !is_mcs_rate(ratespec) &&
 178                (rate_info[ratespec & RSPEC_RATE_MASK] & BRCMS_RATE_FLAG);
 179 }
 180
 181 static inline bool is_cck_rate(u32 ratespec)
 182 {
 183         u32 rate = (ratespec & BRCMS_RATE_MASK);
 184
 185         return !is_mcs_rate(ratespec) && (
 186                         rate == BRCM_RATE_1M || rate == BRCM_RATE_2M ||
 187                         rate == BRCM_RATE_5M5 || rate == BRCM_RATE_11M);
 188 }
 189
 190 static inline bool is_single_stream(u8 mcs)
 191 {
 192         return mcs <= HIGHEST_SINGLE_STREAM_MCS || mcs == 32;
 193 }
 194
 195 static inline u8 cck_rspec(u8 cck)
 196 {
 197         return cck & RSPEC_RATE_MASK;
 198 }
 199
 200 /* Convert encoded rate value in plcp header to numerical rates in 500 KHz
 201  * increments */
 202 static inline u8 ofdm_phy2mac_rate(u8 rlpt)
 203 {
 204         return wlc_phy_get_ofdm_rate_lookup()[rlpt & 0x7];
 205 }
 206
 207 static inline u8 cck_phy2mac_rate(u8 signal)
 208 {
 209         return signal/5;
 210 }
 211
 212 /* Rates specified in brcms_c_rateset_filter() */
 213 #define BRCMS_RATES_CCK_OFDM    0
 214 #define BRCMS_RATES_CCK         1
 215 #define BRCMS_RATES_OFDM                2
 216
 217 /* sanitize, and sort a rateset with the basic bit(s) preserved, validate
 218  * rateset */
 219 extern bool
 220 brcms_c_rate_hwrs_filter_sort_validate(struct brcms_c_rateset *rs,
 221                                        const struct brcms_c_rateset *hw_rs,
 222                                        bool check_brate, u8 txstreams);
 223 /* copy rateset src to dst as-is (no masking or sorting) */
 224 extern void brcms_c_rateset_copy(const struct brcms_c_rateset *src,
 225                              struct brcms_c_rateset *dst);
 226
 227 /* would be nice to have these documented ... */
 228 extern u32 brcms_c_compute_rspec(struct d11rxhdr *rxh, u8 *plcp);
 229
 230 extern void brcms_c_rateset_filter(struct brcms_c_rateset *src,
 231         struct brcms_c_rateset *dst, bool basic_only, u8 rates, uint xmask,
 232         bool mcsallow);
 233
 234 extern void
 235 brcms_c_rateset_default(struct brcms_c_rateset *rs_tgt,
 236                         const struct brcms_c_rateset *rs_hw, uint phy_type,
 237                         int bandtype, bool cck_only, uint rate_mask,
 238                         bool mcsallow, u8 bw, u8 txstreams);
 239
 240 extern s16 brcms_c_rate_legacy_phyctl(uint rate);
 241
 242 extern void brcms_c_rateset_mcs_upd(struct brcms_c_rateset *rs, u8 txstreams);
 243 extern void brcms_c_rateset_mcs_clear(struct brcms_c_rateset *rateset);
 244 extern void brcms_c_rateset_mcs_build(struct brcms_c_rateset *rateset,
 245                                       u8 txstreams);
 246 extern void brcms_c_rateset_bw_mcs_filter(struct brcms_c_rateset *rateset,
 247                                           u8 bw);
 248
 249 #endif                          /* _BRCM_RATE_H_ */