drivers/net/wireless/mediatek/mt7601u/eeprom.c

   1 /*
   2  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/of.h>
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/partitions.h>
  18 #include <linux/etherdevice.h>
  19 #include <asm/unaligned.h>
  20 #include "mt7601u.h"
  21 #include "eeprom.h"
  22
  23 static bool
  24 field_valid(u8 val)
  25 {
  26         return val != 0xff;
  27 }
  28
  29 static s8
  30 field_validate(u8 val)
  31 {
  32         if (!field_valid(val))
  33                 return 0;
  34
  35         return val;
  36 }
  37
  38 static int
  39 mt7601u_efuse_read(struct mt7601u_dev *dev, u16 addr, u8 *data,
  40                    enum mt7601u_eeprom_access_modes mode)
  41 {
  42         u32 val;
  43         int i;
  44
  45         val = mt76_rr(dev, MT_EFUSE_CTRL);
  46         val &= ~(MT_EFUSE_CTRL_AIN |
  47                  MT_EFUSE_CTRL_MODE);
  48         val |= FIELD_PREP(MT_EFUSE_CTRL_AIN, addr & ~0xf) |
  49                FIELD_PREP(MT_EFUSE_CTRL_MODE, mode) |
  50                MT_EFUSE_CTRL_KICK;
  51         mt76_wr(dev, MT_EFUSE_CTRL, val);
  52
  53         if (!mt76_poll(dev, MT_EFUSE_CTRL, MT_EFUSE_CTRL_KICK, 0, 1000))
  54                 return -ETIMEDOUT;
  55
  56         val = mt76_rr(dev, MT_EFUSE_CTRL);
  57         if ((val & MT_EFUSE_CTRL_AOUT) == MT_EFUSE_CTRL_AOUT) {
  58                 /* Parts of eeprom not in the usage map (0x80-0xc0,0xf0)
  59                  * will not return valid data but it's ok.
  60                  */
  61                 memset(data, 0xff, 16);
  62                 return 0;
  63         }
  64
  65         for (i = 0; i < 4; i++) {
  66                 val = mt76_rr(dev, MT_EFUSE_DATA(i));
  67                 put_unaligned_le32(val, data + 4 * i);
  68         }
  69
  70         return 0;
  71 }
  72
  73 static int
  74 mt7601u_efuse_physical_size_check(struct mt7601u_dev *dev)
  75 {
  76         const int map_reads = DIV_ROUND_UP(MT_EFUSE_USAGE_MAP_SIZE, 16);
  77         u8 data[map_reads * 16];
  78         int ret, i;
  79         u32 start = 0, end = 0, cnt_free;
  80
  81         for (i = 0; i < map_reads; i++) {
  82                 ret = mt7601u_efuse_read(dev, MT_EE_USAGE_MAP_START + i * 16,
  83                                          data + i * 16, MT_EE_PHYSICAL_READ);
  84                 if (ret)
  85                         return ret;
  86         }
  87
  88         for (i = 0; i < MT_EFUSE_USAGE_MAP_SIZE; i++)
  89                 if (!data[i]) {
  90                         if (!start)
  91                                 start = MT_EE_USAGE_MAP_START + i;
  92                         end = MT_EE_USAGE_MAP_START + i;
  93                 }
  94         cnt_free = end - start + 1;
  95
  96         if (MT_EFUSE_USAGE_MAP_SIZE - cnt_free < 5) {
  97                 dev_err(dev->dev, "Error: your device needs default EEPROM file and this driver doesn't support it!\n");
  98                 return -EINVAL;
  99         }
 100
 101         return 0;
 102 }
 103
 104 static bool
 105 mt7601u_has_tssi(struct mt7601u_dev *dev, u8 *eeprom)
 106 {
 107         u16 nic_conf1 = get_unaligned_le16(eeprom + MT_EE_NIC_CONF_1);
 108
 109         return ~nic_conf1 && (nic_conf1 & MT_EE_NIC_CONF_1_TX_ALC_EN);
 110 }
 111
 112 static void
 113 mt7601u_set_chip_cap(struct mt7601u_dev *dev, u8 *eeprom)
 114 {
 115         u16 nic_conf0 = get_unaligned_le16(eeprom + MT_EE_NIC_CONF_0);
 116         u16 nic_conf1 = get_unaligned_le16(eeprom + MT_EE_NIC_CONF_1);
 117
 118         if (!field_valid(nic_conf1 & 0xff))
 119                 nic_conf1 &= 0xff00;
 120
 121         dev->ee->tssi_enabled = mt7601u_has_tssi(dev, eeprom) &&
 122                                 !(nic_conf1 & MT_EE_NIC_CONF_1_TEMP_TX_ALC);
 123
 124         if (nic_conf1 & MT_EE_NIC_CONF_1_HW_RF_CTRL)
 125                 dev_err(dev->dev,
 126                         "Error: this driver does not support HW RF ctrl\n");
 127
 128         if (!field_valid(nic_conf0 >> 8))
 129                 return;
 130
 131         if (FIELD_GET(MT_EE_NIC_CONF_0_RX_PATH, nic_conf0) > 1 ||
 132             FIELD_GET(MT_EE_NIC_CONF_0_TX_PATH, nic_conf0) > 1)
 133                 dev_err(dev->dev,
 134                         "Error: device has more than 1 RX/TX stream!\n");
 135 }
 136
 137 static int
 138 mt7601u_set_macaddr(struct mt7601u_dev *dev, const u8 *eeprom)
 139 {
 140         const void *src = eeprom + MT_EE_MAC_ADDR;
 141
 142         ether_addr_copy(dev->macaddr, src);
 143
 144         if (!is_valid_ether_addr(dev->macaddr)) {
 145                 eth_random_addr(dev->macaddr);
 146                 dev_info(dev->dev,
 147                          "Invalid MAC address, using random address %pM\n",
 148                          dev->macaddr);
 149         }
 150
 151         mt76_wr(dev, MT_MAC_ADDR_DW0, get_unaligned_le32(dev->macaddr));
 152         mt76_wr(dev, MT_MAC_ADDR_DW1, get_unaligned_le16(dev->macaddr + 4) |
 153                 FIELD_PREP(MT_MAC_ADDR_DW1_U2ME_MASK, 0xff));
 154
 155         return 0;
 156 }
 157
 158 static void mt7601u_set_channel_target_power(struct mt7601u_dev *dev,
 159                                              u8 *eeprom, u8 max_pwr)
 160 {
 161         u8 trgt_pwr = eeprom[MT_EE_TX_TSSI_TARGET_POWER];
 162
 163         if (trgt_pwr > max_pwr || !trgt_pwr) {
 164                 dev_warn(dev->dev, "Error: EEPROM trgt power invalid %hhx!\n",
 165                          trgt_pwr);
 166                 trgt_pwr = 0x20;
 167         }
 168
 169         memset(dev->ee->chan_pwr, trgt_pwr, sizeof(dev->ee->chan_pwr));
 170 }
 171
 172 static void
 173 mt7601u_set_channel_power(struct mt7601u_dev *dev, u8 *eeprom)
 174 {
 175         u32 i, val;
 176         u8 max_pwr;
 177
 178         val = mt7601u_rr(dev, MT_TX_ALC_CFG_0);
 179         max_pwr = FIELD_GET(MT_TX_ALC_CFG_0_LIMIT_0, val);
 180
 181         if (mt7601u_has_tssi(dev, eeprom)) {
 182                 mt7601u_set_channel_target_power(dev, eeprom, max_pwr);
 183                 return;
 184         }
 185
 186         for (i = 0; i < 14; i++) {
 187                 s8 power = field_validate(eeprom[MT_EE_TX_POWER_OFFSET + i]);
 188
 189                 if (power > max_pwr || power < 0)
 190                         power = MT7601U_DEFAULT_TX_POWER;
 191
 192                 dev->ee->chan_pwr[i] = power;
 193         }
 194 }
 195
 196 static void
 197 mt7601u_set_country_reg(struct mt7601u_dev *dev, u8 *eeprom)
 198 {
 199         /* Note: - region 31 is not valid for mt7601u (see rtmp_init.c)
 200          *       - comments in rtmp_def.h are incorrect (see rt_channel.c)
 201          */
 202         static const struct reg_channel_bounds chan_bounds[] = {
 203                 /* EEPROM country regions 0 - 7 */
 204                 {  1, 11 },     {  1, 13 },     { 10,  2 },     { 10,  4 },
 205                 { 14,  1 },     {  1, 14 },     {  3,  7 },     {  5,  9 },
 206                 /* EEPROM country regions 32 - 33 */
 207                 {  1, 11 },     {  1, 14 }
 208         };
 209         u8 val = eeprom[MT_EE_COUNTRY_REGION];
 210         int idx = -1;
 211
 212         if (val < 8)
 213                 idx = val;
 214         if (val > 31 && val < 33)
 215                 idx = val - 32 + 8;
 216
 217         if (idx != -1)
 218                 dev_info(dev->dev,
 219                          "EEPROM country region %02hhx (channels %hhd-%hhd)\n",
 220                          val, chan_bounds[idx].start,
 221                          chan_bounds[idx].start + chan_bounds[idx].num - 1);
 222         else
 223                 idx = 5; /* channels 1 - 14 */
 224
 225         dev->ee->reg = chan_bounds[idx];
 226
 227         /* TODO: country region 33 is special - phy should be set to B-mode
 228          *       before entering channel 14 (see sta/connect.c)
 229          */
 230 }
 231
 232 static void
 233 mt7601u_set_rf_freq_off(struct mt7601u_dev *dev, u8 *eeprom)
 234 {
 235         u8 comp;
 236
 237         dev->ee->rf_freq_off = field_validate(eeprom[MT_EE_FREQ_OFFSET]);
 238         comp = field_validate(eeprom[MT_EE_FREQ_OFFSET_COMPENSATION]);
 239
 240         if (comp & BIT(7))
 241                 dev->ee->rf_freq_off -= comp & 0x7f;
 242         else
 243                 dev->ee->rf_freq_off += comp;
 244 }
 245
 246 static void
 247 mt7601u_set_rssi_offset(struct mt7601u_dev *dev, u8 *eeprom)
 248 {
 249         int i;
 250         s8 *rssi_offset = dev->ee->rssi_offset;
 251
 252         for (i = 0; i < 2; i++) {
 253                 rssi_offset[i] = eeprom[MT_EE_RSSI_OFFSET + i];
 254
 255                 if (rssi_offset[i] < -10 || rssi_offset[i] > 10) {
 256                         dev_warn(dev->dev,
 257                                  "Warning: EEPROM RSSI is invalid %02hhx\n",
 258                                  rssi_offset[i]);
 259                         rssi_offset[i] = 0;
 260                 }
 261         }
 262 }
 263
 264 static void
 265 mt7601u_extra_power_over_mac(struct mt7601u_dev *dev)
 266 {
 267         u32 val;
 268
 269         val = ((mt7601u_rr(dev, MT_TX_PWR_CFG_1) & 0x0000ff00) >> 8);
 270         val |= ((mt7601u_rr(dev, MT_TX_PWR_CFG_2) & 0x0000ff00) << 8);
 271         mt7601u_wr(dev, MT_TX_PWR_CFG_7, val);
 272
 273         val = ((mt7601u_rr(dev, MT_TX_PWR_CFG_4) & 0x0000ff00) >> 8);
 274         mt7601u_wr(dev, MT_TX_PWR_CFG_9, val);
 275 }
 276
 277 static void
 278 mt7601u_set_power_rate(struct power_per_rate *rate, s8 delta, u8 value)
 279 {
 280         /* Invalid? Note: vendor driver does not handle this */
 281         if (value == 0xff)
 282                 return;
 283
 284         rate->raw = s6_validate(value);
 285         rate->bw20 = s6_to_int(value);
 286         /* Note: vendor driver does cap the value to s6 right away */
 287         rate->bw40 = rate->bw20 + delta;
 288 }
 289
 290 static void
 291 mt7601u_save_power_rate(struct mt7601u_dev *dev, s8 delta, u32 val, int i)
 292 {
 293         struct mt7601u_rate_power *t = &dev->ee->power_rate_table;
 294
 295         switch (i) {
 296         case 0:
 297                 mt7601u_set_power_rate(&t->cck[0], delta, (val >> 0) & 0xff);
 298                 mt7601u_set_power_rate(&t->cck[1], delta, (val >> 8) & 0xff);
 299                 /* Save cck bw20 for fixups of channel 14 */
 300                 dev->ee->real_cck_bw20[0] = t->cck[0].bw20;
 301                 dev->ee->real_cck_bw20[1] = t->cck[1].bw20;
 302
 303                 mt7601u_set_power_rate(&t->ofdm[0], delta, (val >> 16) & 0xff);
 304                 mt7601u_set_power_rate(&t->ofdm[1], delta, (val >> 24) & 0xff);
 305                 break;
 306         case 1:
 307                 mt7601u_set_power_rate(&t->ofdm[2], delta, (val >> 0) & 0xff);
 308                 mt7601u_set_power_rate(&t->ofdm[3], delta, (val >> 8) & 0xff);
 309                 mt7601u_set_power_rate(&t->ht[0], delta, (val >> 16) & 0xff);
 310                 mt7601u_set_power_rate(&t->ht[1], delta, (val >> 24) & 0xff);
 311                 break;
 312         case 2:
 313                 mt7601u_set_power_rate(&t->ht[2], delta, (val >> 0) & 0xff);
 314                 mt7601u_set_power_rate(&t->ht[3], delta, (val >> 8) & 0xff);
 315                 break;
 316         }
 317 }
 318
 319 static s8
 320 get_delta(u8 val)
 321 {
 322         s8 ret;
 323
 324         if (!field_valid(val) || !(val & BIT(7)))
 325                 return 0;
 326
 327         ret = val & 0x1f;
 328         if (ret > 8)
 329                 ret = 8;
 330         if (val & BIT(6))
 331                 ret = -ret;
 332
 333         return ret;
 334 }
 335
 336 static void
 337 mt7601u_config_tx_power_per_rate(struct mt7601u_dev *dev, u8 *eeprom)
 338 {
 339         u32 val;
 340         s8 bw40_delta;
 341         int i;
 342
 343         bw40_delta = get_delta(eeprom[MT_EE_TX_POWER_DELTA_BW40]);
 344
 345         for (i = 0; i < 5; i++) {
 346                 val = get_unaligned_le32(eeprom + MT_EE_TX_POWER_BYRATE(i));
 347
 348                 mt7601u_save_power_rate(dev, bw40_delta, val, i);
 349
 350                 if (~val)
 351                         mt7601u_wr(dev, MT_TX_PWR_CFG_0 + i * 4, val);
 352         }
 353
 354         mt7601u_extra_power_over_mac(dev);
 355 }
 356
 357 static void
 358 mt7601u_init_tssi_params(struct mt7601u_dev *dev, u8 *eeprom)
 359 {
 360         struct tssi_data *d = &dev->ee->tssi_data;
 361
 362         if (!dev->ee->tssi_enabled)
 363                 return;
 364
 365         d->slope = eeprom[MT_EE_TX_TSSI_SLOPE];
 366         d->tx0_delta_offset = eeprom[MT_EE_TX_TSSI_OFFSET] * 1024;
 367         d->offset[0] = eeprom[MT_EE_TX_TSSI_OFFSET_GROUP];
 368         d->offset[1] = eeprom[MT_EE_TX_TSSI_OFFSET_GROUP + 1];
 369         d->offset[2] = eeprom[MT_EE_TX_TSSI_OFFSET_GROUP + 2];
 370 }
 371
 372 int
 373 mt7601u_eeprom_init(struct mt7601u_dev *dev)
 374 {
 375         u8 *eeprom;
 376         int i, ret;
 377
 378         ret = mt7601u_efuse_physical_size_check(dev);
 379         if (ret)
 380                 return ret;
 381
 382         dev->ee = devm_kzalloc(dev->dev, sizeof(*dev->ee), GFP_KERNEL);
 383         if (!dev->ee)
 384                 return -ENOMEM;
 385
 386         eeprom = kmalloc(MT7601U_EEPROM_SIZE, GFP_KERNEL);
 387         if (!eeprom)
 388                 return -ENOMEM;
 389
 390         for (i = 0; i + 16 <= MT7601U_EEPROM_SIZE; i += 16) {
 391                 ret = mt7601u_efuse_read(dev, i, eeprom + i, MT_EE_READ);
 392                 if (ret)
 393                         goto out;
 394         }
 395
 396         if (eeprom[MT_EE_VERSION_EE] > MT7601U_EE_MAX_VER)
 397                 dev_warn(dev->dev,
 398                          "Warning: unsupported EEPROM version %02hhx\n",
 399                          eeprom[MT_EE_VERSION_EE]);
 400         dev_info(dev->dev, "EEPROM ver:%02hhx fae:%02hhx\n",
 401                  eeprom[MT_EE_VERSION_EE], eeprom[MT_EE_VERSION_FAE]);
 402
 403         mt7601u_set_macaddr(dev, eeprom);
 404         mt7601u_set_chip_cap(dev, eeprom);
 405         mt7601u_set_channel_power(dev, eeprom);
 406         mt7601u_set_country_reg(dev, eeprom);
 407         mt7601u_set_rf_freq_off(dev, eeprom);
 408         mt7601u_set_rssi_offset(dev, eeprom);
 409         dev->ee->ref_temp = eeprom[MT_EE_REF_TEMP];
 410         dev->ee->lna_gain = eeprom[MT_EE_LNA_GAIN];
 411
 412         mt7601u_config_tx_power_per_rate(dev, eeprom);
 413
 414         mt7601u_init_tssi_params(dev, eeprom);
 415 out:
 416         kfree(eeprom);
 417         return ret;
 418 }