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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
   5  */
   6
   7 #include <linux/of.h>
   8 #include <linux/mtd/mtd.h>
   9 #include <linux/mtd/partitions.h>
  10 #include <linux/etherdevice.h>
  11 #include <asm/unaligned.h>
  12 #include "mt7601u.h"
  13 #include "eeprom.h"
  14 #include "mac.h"
  15
  16 static bool
  17 field_valid(u8 val)
  18 {
  19         return val != 0xff;
  20 }
  21
  22 static s8
  23 field_validate(u8 val)
  24 {
  25         if (!field_valid(val))
  26                 return 0;
  27
  28         return val;
  29 }
  30
  31 static int
  32 mt7601u_efuse_read(struct mt7601u_dev *dev, u16 addr, u8 *data,
  33                    enum mt7601u_eeprom_access_modes mode)
  34 {
  35         u32 val;
  36         int i;
  37
  38         val = mt76_rr(dev, MT_EFUSE_CTRL);
  39         val &= ~(MT_EFUSE_CTRL_AIN |
  40                  MT_EFUSE_CTRL_MODE);
  41         val |= FIELD_PREP(MT_EFUSE_CTRL_AIN, addr & ~0xf) |
  42                FIELD_PREP(MT_EFUSE_CTRL_MODE, mode) |
  43                MT_EFUSE_CTRL_KICK;
  44         mt76_wr(dev, MT_EFUSE_CTRL, val);
  45
  46         if (!mt76_poll(dev, MT_EFUSE_CTRL, MT_EFUSE_CTRL_KICK, 0, 1000))
  47                 return -ETIMEDOUT;
  48
  49         val = mt76_rr(dev, MT_EFUSE_CTRL);
  50         if ((val & MT_EFUSE_CTRL_AOUT) == MT_EFUSE_CTRL_AOUT) {
  51                 /* Parts of eeprom not in the usage map (0x80-0xc0,0xf0)
  52                  * will not return valid data but it's ok.
  53                  */
  54                 memset(data, 0xff, 16);
  55                 return 0;
  56         }
  57
  58         for (i = 0; i < 4; i++) {
  59                 val = mt76_rr(dev, MT_EFUSE_DATA(i));
  60                 put_unaligned_le32(val, data + 4 * i);
  61         }
  62
  63         return 0;
  64 }
  65
  66 static int
  67 mt7601u_efuse_physical_size_check(struct mt7601u_dev *dev)
  68 {
  69         const int map_reads = DIV_ROUND_UP(MT_EFUSE_USAGE_MAP_SIZE, 16);
  70         u8 data[round_up(MT_EFUSE_USAGE_MAP_SIZE, 16)];
  71         int ret, i;
  72         u32 start = 0, end = 0, cnt_free;
  73
  74         for (i = 0; i < map_reads; i++) {
  75                 ret = mt7601u_efuse_read(dev, MT_EE_USAGE_MAP_START + i * 16,
  76                                          data + i * 16, MT_EE_PHYSICAL_READ);
  77                 if (ret)
  78                         return ret;
  79         }
  80
  81         for (i = 0; i < MT_EFUSE_USAGE_MAP_SIZE; i++)
  82                 if (!data[i]) {
  83                         if (!start)
  84                                 start = MT_EE_USAGE_MAP_START + i;
  85                         end = MT_EE_USAGE_MAP_START + i;
  86                 }
  87         cnt_free = end - start + 1;
  88
  89         if (MT_EFUSE_USAGE_MAP_SIZE - cnt_free < 5) {
  90                 dev_err(dev->dev, "Error: your device needs default EEPROM file and this driver doesn't support it!\n");
  91                 return -EINVAL;
  92         }
  93
  94         return 0;
  95 }
  96
  97 static bool
  98 mt7601u_has_tssi(struct mt7601u_dev *dev, u8 *eeprom)
  99 {
 100         u16 nic_conf1 = get_unaligned_le16(eeprom + MT_EE_NIC_CONF_1);
 101
 102         return ~nic_conf1 && (nic_conf1 & MT_EE_NIC_CONF_1_TX_ALC_EN);
 103 }
 104
 105 static void
 106 mt7601u_set_chip_cap(struct mt7601u_dev *dev, u8 *eeprom)
 107 {
 108         u16 nic_conf0 = get_unaligned_le16(eeprom + MT_EE_NIC_CONF_0);
 109         u16 nic_conf1 = get_unaligned_le16(eeprom + MT_EE_NIC_CONF_1);
 110
 111         if (!field_valid(nic_conf1 & 0xff))
 112                 nic_conf1 &= 0xff00;
 113
 114         dev->ee->tssi_enabled = mt7601u_has_tssi(dev, eeprom) &&
 115                                 !(nic_conf1 & MT_EE_NIC_CONF_1_TEMP_TX_ALC);
 116
 117         if (nic_conf1 & MT_EE_NIC_CONF_1_HW_RF_CTRL)
 118                 dev_err(dev->dev,
 119                         "Error: this driver does not support HW RF ctrl\n");
 120
 121         if (!field_valid(nic_conf0 >> 8))
 122                 return;
 123
 124         if (FIELD_GET(MT_EE_NIC_CONF_0_RX_PATH, nic_conf0) > 1 ||
 125             FIELD_GET(MT_EE_NIC_CONF_0_TX_PATH, nic_conf0) > 1)
 126                 dev_err(dev->dev,
 127                         "Error: device has more than 1 RX/TX stream!\n");
 128 }
 129
 130 static void mt7601u_set_channel_target_power(struct mt7601u_dev *dev,
 131                                              u8 *eeprom, u8 max_pwr)
 132 {
 133         u8 trgt_pwr = eeprom[MT_EE_TX_TSSI_TARGET_POWER];
 134
 135         if (trgt_pwr > max_pwr || !trgt_pwr) {
 136                 dev_warn(dev->dev, "Error: EEPROM trgt power invalid %hhx!\n",
 137                          trgt_pwr);
 138                 trgt_pwr = 0x20;
 139         }
 140
 141         memset(dev->ee->chan_pwr, trgt_pwr, sizeof(dev->ee->chan_pwr));
 142 }
 143
 144 static void
 145 mt7601u_set_channel_power(struct mt7601u_dev *dev, u8 *eeprom)
 146 {
 147         u32 i, val;
 148         u8 max_pwr;
 149
 150         val = mt7601u_rr(dev, MT_TX_ALC_CFG_0);
 151         max_pwr = FIELD_GET(MT_TX_ALC_CFG_0_LIMIT_0, val);
 152
 153         if (mt7601u_has_tssi(dev, eeprom)) {
 154                 mt7601u_set_channel_target_power(dev, eeprom, max_pwr);
 155                 return;
 156         }
 157
 158         for (i = 0; i < 14; i++) {
 159                 s8 power = field_validate(eeprom[MT_EE_TX_POWER_OFFSET + i]);
 160
 161                 if (power > max_pwr || power < 0)
 162                         power = MT7601U_DEFAULT_TX_POWER;
 163
 164                 dev->ee->chan_pwr[i] = power;
 165         }
 166 }
 167
 168 static void
 169 mt7601u_set_country_reg(struct mt7601u_dev *dev, u8 *eeprom)
 170 {
 171         /* Note: - region 31 is not valid for mt7601u (see rtmp_init.c)
 172          *       - comments in rtmp_def.h are incorrect (see rt_channel.c)
 173          */
 174         static const struct reg_channel_bounds chan_bounds[] = {
 175                 /* EEPROM country regions 0 - 7 */
 176                 {  1, 11 },     {  1, 13 },     { 10,  2 },     { 10,  4 },
 177                 { 14,  1 },     {  1, 14 },     {  3,  7 },     {  5,  9 },
 178                 /* EEPROM country regions 32 - 33 */
 179                 {  1, 11 },     {  1, 14 }
 180         };
 181         u8 val = eeprom[MT_EE_COUNTRY_REGION];
 182         int idx = -1;
 183
 184         if (val < 8)
 185                 idx = val;
 186         if (val > 31 && val < 33)
 187                 idx = val - 32 + 8;
 188
 189         if (idx != -1)
 190                 dev_info(dev->dev,
 191                          "EEPROM country region %02hhx (channels %hhd-%hhd)\n",
 192                          val, chan_bounds[idx].start,
 193                          chan_bounds[idx].start + chan_bounds[idx].num - 1);
 194         else
 195                 idx = 5; /* channels 1 - 14 */
 196
 197         dev->ee->reg = chan_bounds[idx];
 198
 199         /* TODO: country region 33 is special - phy should be set to B-mode
 200          *       before entering channel 14 (see sta/connect.c)
 201          */
 202 }
 203
 204 static void
 205 mt7601u_set_rf_freq_off(struct mt7601u_dev *dev, u8 *eeprom)
 206 {
 207         u8 comp;
 208
 209         dev->ee->rf_freq_off = field_validate(eeprom[MT_EE_FREQ_OFFSET]);
 210         comp = field_validate(eeprom[MT_EE_FREQ_OFFSET_COMPENSATION]);
 211
 212         if (comp & BIT(7))
 213                 dev->ee->rf_freq_off -= comp & 0x7f;
 214         else
 215                 dev->ee->rf_freq_off += comp;
 216 }
 217
 218 static void
 219 mt7601u_set_rssi_offset(struct mt7601u_dev *dev, u8 *eeprom)
 220 {
 221         int i;
 222         s8 *rssi_offset = dev->ee->rssi_offset;
 223
 224         for (i = 0; i < 2; i++) {
 225                 rssi_offset[i] = eeprom[MT_EE_RSSI_OFFSET + i];
 226
 227                 if (rssi_offset[i] < -10 || rssi_offset[i] > 10) {
 228                         dev_warn(dev->dev,
 229                                  "Warning: EEPROM RSSI is invalid %02hhx\n",
 230                                  rssi_offset[i]);
 231                         rssi_offset[i] = 0;
 232                 }
 233         }
 234 }
 235
 236 static void
 237 mt7601u_extra_power_over_mac(struct mt7601u_dev *dev)
 238 {
 239         u32 val;
 240
 241         val = ((mt7601u_rr(dev, MT_TX_PWR_CFG_1) & 0x0000ff00) >> 8);
 242         val |= ((mt7601u_rr(dev, MT_TX_PWR_CFG_2) & 0x0000ff00) << 8);
 243         mt7601u_wr(dev, MT_TX_PWR_CFG_7, val);
 244
 245         val = ((mt7601u_rr(dev, MT_TX_PWR_CFG_4) & 0x0000ff00) >> 8);
 246         mt7601u_wr(dev, MT_TX_PWR_CFG_9, val);
 247 }
 248
 249 static void
 250 mt7601u_set_power_rate(struct power_per_rate *rate, s8 delta, u8 value)
 251 {
 252         /* Invalid? Note: vendor driver does not handle this */
 253         if (value == 0xff)
 254                 return;
 255
 256         rate->raw = s6_validate(value);
 257         rate->bw20 = s6_to_int(value);
 258         /* Note: vendor driver does cap the value to s6 right away */
 259         rate->bw40 = rate->bw20 + delta;
 260 }
 261
 262 static void
 263 mt7601u_save_power_rate(struct mt7601u_dev *dev, s8 delta, u32 val, int i)
 264 {
 265         struct mt7601u_rate_power *t = &dev->ee->power_rate_table;
 266
 267         switch (i) {
 268         case 0:
 269                 mt7601u_set_power_rate(&t->cck[0], delta, (val >> 0) & 0xff);
 270                 mt7601u_set_power_rate(&t->cck[1], delta, (val >> 8) & 0xff);
 271                 /* Save cck bw20 for fixups of channel 14 */
 272                 dev->ee->real_cck_bw20[0] = t->cck[0].bw20;
 273                 dev->ee->real_cck_bw20[1] = t->cck[1].bw20;
 274
 275                 mt7601u_set_power_rate(&t->ofdm[0], delta, (val >> 16) & 0xff);
 276                 mt7601u_set_power_rate(&t->ofdm[1], delta, (val >> 24) & 0xff);
 277                 break;
 278         case 1:
 279                 mt7601u_set_power_rate(&t->ofdm[2], delta, (val >> 0) & 0xff);
 280                 mt7601u_set_power_rate(&t->ofdm[3], delta, (val >> 8) & 0xff);
 281                 mt7601u_set_power_rate(&t->ht[0], delta, (val >> 16) & 0xff);
 282                 mt7601u_set_power_rate(&t->ht[1], delta, (val >> 24) & 0xff);
 283                 break;
 284         case 2:
 285                 mt7601u_set_power_rate(&t->ht[2], delta, (val >> 0) & 0xff);
 286                 mt7601u_set_power_rate(&t->ht[3], delta, (val >> 8) & 0xff);
 287                 break;
 288         }
 289 }
 290
 291 static s8
 292 get_delta(u8 val)
 293 {
 294         s8 ret;
 295
 296         if (!field_valid(val) || !(val & BIT(7)))
 297                 return 0;
 298
 299         ret = val & 0x1f;
 300         if (ret > 8)
 301                 ret = 8;
 302         if (val & BIT(6))
 303                 ret = -ret;
 304
 305         return ret;
 306 }
 307
 308 static void
 309 mt7601u_config_tx_power_per_rate(struct mt7601u_dev *dev, u8 *eeprom)
 310 {
 311         u32 val;
 312         s8 bw40_delta;
 313         int i;
 314
 315         bw40_delta = get_delta(eeprom[MT_EE_TX_POWER_DELTA_BW40]);
 316
 317         for (i = 0; i < 5; i++) {
 318                 val = get_unaligned_le32(eeprom + MT_EE_TX_POWER_BYRATE(i));
 319
 320                 mt7601u_save_power_rate(dev, bw40_delta, val, i);
 321
 322                 if (~val)
 323                         mt7601u_wr(dev, MT_TX_PWR_CFG_0 + i * 4, val);
 324         }
 325
 326         mt7601u_extra_power_over_mac(dev);
 327 }
 328
 329 static void
 330 mt7601u_init_tssi_params(struct mt7601u_dev *dev, u8 *eeprom)
 331 {
 332         struct tssi_data *d = &dev->ee->tssi_data;
 333
 334         if (!dev->ee->tssi_enabled)
 335                 return;
 336
 337         d->slope = eeprom[MT_EE_TX_TSSI_SLOPE];
 338         d->tx0_delta_offset = eeprom[MT_EE_TX_TSSI_OFFSET] * 1024;
 339         d->offset[0] = eeprom[MT_EE_TX_TSSI_OFFSET_GROUP];
 340         d->offset[1] = eeprom[MT_EE_TX_TSSI_OFFSET_GROUP + 1];
 341         d->offset[2] = eeprom[MT_EE_TX_TSSI_OFFSET_GROUP + 2];
 342 }
 343
 344 int
 345 mt7601u_eeprom_init(struct mt7601u_dev *dev)
 346 {
 347         u8 *eeprom;
 348         int i, ret;
 349
 350         ret = mt7601u_efuse_physical_size_check(dev);
 351         if (ret)
 352                 return ret;
 353
 354         dev->ee = devm_kzalloc(dev->dev, sizeof(*dev->ee), GFP_KERNEL);
 355         if (!dev->ee)
 356                 return -ENOMEM;
 357
 358         eeprom = kmalloc(MT7601U_EEPROM_SIZE, GFP_KERNEL);
 359         if (!eeprom)
 360                 return -ENOMEM;
 361
 362         for (i = 0; i + 16 <= MT7601U_EEPROM_SIZE; i += 16) {
 363                 ret = mt7601u_efuse_read(dev, i, eeprom + i, MT_EE_READ);
 364                 if (ret)
 365                         goto out;
 366         }
 367
 368         if (eeprom[MT_EE_VERSION_EE] > MT7601U_EE_MAX_VER)
 369                 dev_warn(dev->dev,
 370                          "Warning: unsupported EEPROM version %02hhx\n",
 371                          eeprom[MT_EE_VERSION_EE]);
 372         dev_info(dev->dev, "EEPROM ver:%02hhx fae:%02hhx\n",
 373                  eeprom[MT_EE_VERSION_EE], eeprom[MT_EE_VERSION_FAE]);
 374
 375         mt7601u_set_macaddr(dev, eeprom + MT_EE_MAC_ADDR);
 376         mt7601u_set_chip_cap(dev, eeprom);
 377         mt7601u_set_channel_power(dev, eeprom);
 378         mt7601u_set_country_reg(dev, eeprom);
 379         mt7601u_set_rf_freq_off(dev, eeprom);
 380         mt7601u_set_rssi_offset(dev, eeprom);
 381         dev->ee->ref_temp = eeprom[MT_EE_REF_TEMP];
 382         dev->ee->lna_gain = eeprom[MT_EE_LNA_GAIN];
 383
 384         mt7601u_config_tx_power_per_rate(dev, eeprom);
 385
 386         mt7601u_init_tssi_params(dev, eeprom);
 387 out:
 388         kfree(eeprom);
 389         return ret;
 390 }