linux/drivers/net/wireless/mediatek/mt7601u/eeprom.c
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   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
  23static bool
  24field_valid(u8 val)
  25{
  26        return val != 0xff;
  27}
  28
  29static s8
  30field_validate(u8 val)
  31{
  32        if (!field_valid(val))
  33                return 0;
  34
  35        return val;
  36}
  37
  38static int
  39mt7601u_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
  73static int
  74mt7601u_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
 104static bool
 105mt7601u_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
 112static void
 113mt7601u_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
 137static int
 138mt7601u_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
 158static 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
 172static void
 173mt7601u_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
 196static void
 197mt7601u_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
 232static void
 233mt7601u_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
 246static void
 247mt7601u_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
 264static void
 265mt7601u_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
 277static void
 278mt7601u_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
 290static void
 291mt7601u_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
 319static s8
 320get_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
 336static void
 337mt7601u_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
 357static void
 358mt7601u_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
 372int
 373mt7601u_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);
 415out:
 416        kfree(eeprom);
 417        return ret;
 418}
 419