drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c

   1 // SPDX-License-Identifier: ISC
   2 /* Copyright (C) 2020 MediaTek Inc. */
   3
   4 #include "mt7915.h"
   5 #include "eeprom.h"
   6
   7 static u32 mt7915_eeprom_read(struct mt7915_dev *dev, u32 offset)
   8 {
   9         u8 *data = dev->mt76.eeprom.data;
  10
  11         if (data[offset] == 0xff)
  12                 mt7915_mcu_get_eeprom(dev, offset);
  13
  14         return data[offset];
  15 }
  16
  17 static int mt7915_eeprom_load(struct mt7915_dev *dev)
  18 {
  19         int ret;
  20
  21         ret = mt76_eeprom_init(&dev->mt76, MT7915_EEPROM_SIZE);
  22         if (ret < 0)
  23                 return ret;
  24
  25         memset(dev->mt76.eeprom.data, -1, MT7915_EEPROM_SIZE);
  26
  27         return 0;
  28 }
  29
  30 static int mt7915_check_eeprom(struct mt7915_dev *dev)
  31 {
  32         u8 *eeprom = dev->mt76.eeprom.data;
  33         u16 val;
  34
  35         mt7915_eeprom_read(dev, MT_EE_CHIP_ID);
  36         val = get_unaligned_le16(eeprom);
  37
  38         switch (val) {
  39         case 0x7915:
  40                 return 0;
  41         default:
  42                 return -EINVAL;
  43         }
  44 }
  45
  46 void mt7915_eeprom_parse_band_config(struct mt7915_phy *phy)
  47 {
  48         struct mt7915_dev *dev = phy->dev;
  49         bool ext_phy = phy != &dev->phy;
  50         u32 val;
  51
  52         val = mt7915_eeprom_read(dev, MT_EE_WIFI_CONF + ext_phy);
  53         val = FIELD_GET(MT_EE_WIFI_CONF_BAND_SEL, val);
  54         switch (val) {
  55         case MT_EE_5GHZ:
  56                 phy->mt76->cap.has_5ghz = true;
  57                 break;
  58         case MT_EE_2GHZ:
  59                 phy->mt76->cap.has_2ghz = true;
  60                 break;
  61         default:
  62                 phy->mt76->cap.has_2ghz = true;
  63                 phy->mt76->cap.has_5ghz = true;
  64                 break;
  65         }
  66 }
  67
  68 static void mt7915_eeprom_parse_hw_cap(struct mt7915_dev *dev)
  69 {
  70         u8 nss, tx_mask[2] = {}, *eeprom = dev->mt76.eeprom.data;
  71
  72         mt7915_eeprom_parse_band_config(&dev->phy);
  73
  74         /* read tx mask from eeprom */
  75         tx_mask[0] = FIELD_GET(MT_EE_WIFI_CONF_TX_MASK,
  76                                eeprom[MT_EE_WIFI_CONF]);
  77         if (dev->dbdc_support)
  78                 tx_mask[1] = FIELD_GET(MT_EE_WIFI_CONF_TX_MASK,
  79                                        eeprom[MT_EE_WIFI_CONF + 1]);
  80
  81         nss = tx_mask[0] + tx_mask[1];
  82         if (!nss || nss > 4) {
  83                 tx_mask[0] = 4;
  84                 nss = 4;
  85         }
  86
  87         dev->chainmask = BIT(nss) - 1;
  88         dev->mphy.antenna_mask = BIT(tx_mask[0]) - 1;
  89         dev->phy.chainmask = dev->mphy.antenna_mask;
  90 }
  91
  92 int mt7915_eeprom_init(struct mt7915_dev *dev)
  93 {
  94         int ret;
  95
  96         ret = mt7915_eeprom_load(dev);
  97         if (ret < 0)
  98                 return ret;
  99
 100         ret = mt7915_check_eeprom(dev);
 101         if (ret)
 102                 return ret;
 103
 104         mt7915_eeprom_parse_hw_cap(dev);
 105         memcpy(dev->mphy.macaddr, dev->mt76.eeprom.data + MT_EE_MAC_ADDR,
 106                ETH_ALEN);
 107
 108         mt76_eeprom_override(&dev->mphy);
 109
 110         return 0;
 111 }
 112
 113 int mt7915_eeprom_get_target_power(struct mt7915_dev *dev,
 114                                    struct ieee80211_channel *chan,
 115                                    u8 chain_idx)
 116 {
 117         int index;
 118         bool tssi_on;
 119
 120         if (chain_idx > 3)
 121                 return -EINVAL;
 122
 123         tssi_on = mt7915_tssi_enabled(dev, chan->band);
 124
 125         if (chan->band == NL80211_BAND_2GHZ) {
 126                 index = MT_EE_TX0_POWER_2G + chain_idx * 3 + !tssi_on;
 127         } else {
 128                 int group = tssi_on ?
 129                             mt7915_get_channel_group(chan->hw_value) : 8;
 130
 131                 index = MT_EE_TX0_POWER_5G + chain_idx * 12 + group;
 132         }
 133
 134         return mt7915_eeprom_read(dev, index);
 135 }
 136
 137 static const u8 sku_cck_delta_map[] = {
 138         SKU_CCK_GROUP0,
 139         SKU_CCK_GROUP0,
 140         SKU_CCK_GROUP1,
 141         SKU_CCK_GROUP1,
 142 };
 143
 144 static const u8 sku_ofdm_delta_map[] = {
 145         SKU_OFDM_GROUP0,
 146         SKU_OFDM_GROUP0,
 147         SKU_OFDM_GROUP1,
 148         SKU_OFDM_GROUP1,
 149         SKU_OFDM_GROUP2,
 150         SKU_OFDM_GROUP2,
 151         SKU_OFDM_GROUP3,
 152         SKU_OFDM_GROUP4,
 153 };
 154
 155 static const u8 sku_mcs_delta_map[] = {
 156         SKU_MCS_GROUP0,
 157         SKU_MCS_GROUP1,
 158         SKU_MCS_GROUP1,
 159         SKU_MCS_GROUP2,
 160         SKU_MCS_GROUP2,
 161         SKU_MCS_GROUP3,
 162         SKU_MCS_GROUP4,
 163         SKU_MCS_GROUP5,
 164         SKU_MCS_GROUP6,
 165         SKU_MCS_GROUP7,
 166         SKU_MCS_GROUP8,
 167         SKU_MCS_GROUP9,
 168 };
 169
 170 #define SKU_GROUP(_mode, _len, _ofs_2g, _ofs_5g, _map)  \
 171         [_mode] = {                                     \
 172         .len = _len,                                    \
 173         .offset = {                                     \
 174                 _ofs_2g,                                \
 175                 _ofs_5g,                                \
 176         },                                              \
 177         .delta_map = _map                               \
 178 }
 179
 180 const struct sku_group mt7915_sku_groups[] = {
 181         SKU_GROUP(SKU_CCK, 4, 0x252, 0, sku_cck_delta_map),
 182         SKU_GROUP(SKU_OFDM, 8, 0x254, 0x29d, sku_ofdm_delta_map),
 183
 184         SKU_GROUP(SKU_HT_BW20, 8, 0x259, 0x2a2, sku_mcs_delta_map),
 185         SKU_GROUP(SKU_HT_BW40, 9, 0x262, 0x2ab, sku_mcs_delta_map),
 186         SKU_GROUP(SKU_VHT_BW20, 12, 0x259, 0x2a2, sku_mcs_delta_map),
 187         SKU_GROUP(SKU_VHT_BW40, 12, 0x262, 0x2ab, sku_mcs_delta_map),
 188         SKU_GROUP(SKU_VHT_BW80, 12, 0, 0x2b4, sku_mcs_delta_map),
 189         SKU_GROUP(SKU_VHT_BW160, 12, 0, 0, sku_mcs_delta_map),
 190
 191         SKU_GROUP(SKU_HE_RU26, 12, 0x27f, 0x2dd, sku_mcs_delta_map),
 192         SKU_GROUP(SKU_HE_RU52, 12, 0x289, 0x2e7, sku_mcs_delta_map),
 193         SKU_GROUP(SKU_HE_RU106, 12, 0x293, 0x2f1, sku_mcs_delta_map),
 194         SKU_GROUP(SKU_HE_RU242, 12, 0x26b, 0x2bf, sku_mcs_delta_map),
 195         SKU_GROUP(SKU_HE_RU484, 12, 0x275, 0x2c9, sku_mcs_delta_map),
 196         SKU_GROUP(SKU_HE_RU996, 12, 0, 0x2d3, sku_mcs_delta_map),
 197         SKU_GROUP(SKU_HE_RU2x996, 12, 0, 0, sku_mcs_delta_map),
 198 };
 199
 200 static s8
 201 mt7915_get_sku_delta(struct mt7915_dev *dev, u32 addr)
 202 {
 203         u32 val = mt7915_eeprom_read(dev, addr);
 204         s8 delta = FIELD_GET(SKU_DELTA_VAL, val);
 205
 206         if (!(val & SKU_DELTA_EN))
 207                 return 0;
 208
 209         return val & SKU_DELTA_ADD ? delta : -delta;
 210 }
 211
 212 static void
 213 mt7915_eeprom_init_sku_band(struct mt7915_dev *dev,
 214                             struct ieee80211_supported_band *sband)
 215 {
 216         int i, band = sband->band;
 217         s8 *rate_power = dev->rate_power[band], max_delta = 0;
 218         u8 idx = 0;
 219
 220         for (i = 0; i < ARRAY_SIZE(mt7915_sku_groups); i++) {
 221                 const struct sku_group *sku = &mt7915_sku_groups[i];
 222                 u32 offset = sku->offset[band];
 223                 int j;
 224
 225                 if (!offset) {
 226                         idx += sku->len;
 227                         continue;
 228                 }
 229
 230                 rate_power[idx++] = mt7915_get_sku_delta(dev, offset);
 231                 if (rate_power[idx - 1] > max_delta)
 232                         max_delta = rate_power[idx - 1];
 233
 234                 if (i == SKU_HT_BW20 || i == SKU_VHT_BW20)
 235                         offset += 1;
 236
 237                 for (j = 1; j < sku->len; j++) {
 238                         u32 addr = offset + sku->delta_map[j];
 239
 240                         rate_power[idx++] = mt7915_get_sku_delta(dev, addr);
 241                         if (rate_power[idx - 1] > max_delta)
 242                                 max_delta = rate_power[idx - 1];
 243                 }
 244         }
 245
 246         rate_power[idx] = max_delta;
 247 }
 248
 249 void mt7915_eeprom_init_sku(struct mt7915_dev *dev)
 250 {
 251         mt7915_eeprom_init_sku_band(dev, &dev->mphy.sband_2g.sband);
 252         mt7915_eeprom_init_sku_band(dev, &dev->mphy.sband_5g.sband);
 253 }