1 // SPDX-License-Identifier: ISC 2 /* 3 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name> 4 */ 5 #include <linux/of.h> 6 #include <linux/of_net.h> 7 #include <linux/mtd/mtd.h> 8 #include <linux/mtd/partitions.h> 9 #include <linux/nvmem-consumer.h> 10 #include <linux/etherdevice.h> 11 #include "mt76.h" 12 13 static int mt76_get_of_eeprom_data(struct mt76_dev *dev, void *eep, int len) 14 { 15 struct device_node *np = dev->dev->of_node; 16 const void *data; 17 int size; 18 19 data = of_get_property(np, "mediatek,eeprom-data", &size); 20 if (!data) 21 return -ENOENT; 22 23 if (size > len) 24 return -EINVAL; 25 26 memcpy(eep, data, size); 27 28 return 0; 29 } 30 31 int mt76_get_of_data_from_mtd(struct mt76_dev *dev, void *eep, int offset, int len) 32 { 33 #ifdef CONFIG_MTD 34 struct device_node *np = dev->dev->of_node; 35 struct mtd_info *mtd; 36 const __be32 *list; 37 const char *part; 38 phandle phandle; 39 size_t retlen; 40 int size; 41 int ret; 42 43 list = of_get_property(np, "mediatek,mtd-eeprom", &size); 44 if (!list) 45 return -ENOENT; 46 47 phandle = be32_to_cpup(list++); 48 if (!phandle) 49 return -ENOENT; 50 51 np = of_find_node_by_phandle(phandle); 52 if (!np) 53 return -EINVAL; 54 55 part = of_get_property(np, "label", NULL); 56 if (!part) 57 part = np->name; 58 59 mtd = get_mtd_device_nm(part); 60 if (IS_ERR(mtd)) { 61 ret = PTR_ERR(mtd); 62 goto out_put_node; 63 } 64 65 if (size <= sizeof(*list)) { 66 ret = -EINVAL; 67 goto out_put_node; 68 } 69 70 offset += be32_to_cpup(list); 71 ret = mtd_read(mtd, offset, len, &retlen, eep); 72 put_mtd_device(mtd); 73 if (mtd_is_bitflip(ret)) 74 ret = 0; 75 if (ret) { 76 dev_err(dev->dev, "reading EEPROM from mtd %s failed: %i\n", 77 part, ret); 78 goto out_put_node; 79 } 80 81 if (retlen < len) { 82 ret = -EINVAL; 83 goto out_put_node; 84 } 85 86 if (of_property_read_bool(dev->dev->of_node, "big-endian")) { 87 u8 *data = (u8 *)eep; 88 int i; 89 90 /* convert eeprom data in Little Endian */ 91 for (i = 0; i < round_down(len, 2); i += 2) 92 put_unaligned_le16(get_unaligned_be16(&data[i]), 93 &data[i]); 94 } 95 96 #ifdef CONFIG_NL80211_TESTMODE 97 dev->test_mtd.name = devm_kstrdup(dev->dev, part, GFP_KERNEL); 98 if (!dev->test_mtd.name) { 99 ret = -ENOMEM; 100 goto out_put_node; 101 } 102 dev->test_mtd.offset = offset; 103 #endif 104 105 out_put_node: 106 of_node_put(np); 107 return ret; 108 #else 109 return -ENOENT; 110 #endif 111 } 112 EXPORT_SYMBOL_GPL(mt76_get_of_data_from_mtd); 113 114 int mt76_get_of_data_from_nvmem(struct mt76_dev *dev, void *eep, 115 const char *cell_name, int len) 116 { 117 struct device_node *np = dev->dev->of_node; 118 struct nvmem_cell *cell; 119 const void *data; 120 size_t retlen; 121 int ret = 0; 122 123 cell = of_nvmem_cell_get(np, cell_name); 124 if (IS_ERR(cell)) 125 return PTR_ERR(cell); 126 127 data = nvmem_cell_read(cell, &retlen); 128 nvmem_cell_put(cell); 129 130 if (IS_ERR(data)) 131 return PTR_ERR(data); 132 133 if (retlen < len) { 134 ret = -EINVAL; 135 goto exit; 136 } 137 138 memcpy(eep, data, len); 139 140 exit: 141 kfree(data); 142 143 return ret; 144 } 145 EXPORT_SYMBOL_GPL(mt76_get_of_data_from_nvmem); 146 147 static int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int len) 148 { 149 struct device_node *np = dev->dev->of_node; 150 int ret; 151 152 if (!np) 153 return -ENOENT; 154 155 ret = mt76_get_of_eeprom_data(dev, eep, len); 156 if (!ret) 157 return 0; 158 159 ret = mt76_get_of_data_from_mtd(dev, eep, 0, len); 160 if (!ret) 161 return 0; 162 163 return mt76_get_of_data_from_nvmem(dev, eep, "eeprom", len); 164 } 165 166 void 167 mt76_eeprom_override(struct mt76_phy *phy) 168 { 169 struct mt76_dev *dev = phy->dev; 170 struct device_node *np = dev->dev->of_node; 171 172 of_get_mac_address(np, phy->macaddr); 173 174 if (!is_valid_ether_addr(phy->macaddr)) { 175 eth_random_addr(phy->macaddr); 176 dev_info(dev->dev, 177 "Invalid MAC address, using random address %pM\n", 178 phy->macaddr); 179 } 180 } 181 EXPORT_SYMBOL_GPL(mt76_eeprom_override); 182 183 static bool mt76_string_prop_find(struct property *prop, const char *str) 184 { 185 const char *cp = NULL; 186 187 if (!prop || !str || !str[0]) 188 return false; 189 190 while ((cp = of_prop_next_string(prop, cp)) != NULL) 191 if (!strcasecmp(cp, str)) 192 return true; 193 194 return false; 195 } 196 197 struct device_node * 198 mt76_find_power_limits_node(struct mt76_dev *dev) 199 { 200 struct device_node *np = dev->dev->of_node; 201 const char *const region_names[] = { 202 [NL80211_DFS_UNSET] = "ww", 203 [NL80211_DFS_ETSI] = "etsi", 204 [NL80211_DFS_FCC] = "fcc", 205 [NL80211_DFS_JP] = "jp", 206 }; 207 struct device_node *cur, *fallback = NULL; 208 const char *region_name = NULL; 209 210 if (dev->region < ARRAY_SIZE(region_names)) 211 region_name = region_names[dev->region]; 212 213 np = of_get_child_by_name(np, "power-limits"); 214 if (!np) 215 return NULL; 216 217 for_each_child_of_node(np, cur) { 218 struct property *country = of_find_property(cur, "country", NULL); 219 struct property *regd = of_find_property(cur, "regdomain", NULL); 220 221 if (!country && !regd) { 222 fallback = cur; 223 continue; 224 } 225 226 if (mt76_string_prop_find(country, dev->alpha2) || 227 mt76_string_prop_find(regd, region_name)) { 228 of_node_put(np); 229 return cur; 230 } 231 } 232 233 of_node_put(np); 234 return fallback; 235 } 236 EXPORT_SYMBOL_GPL(mt76_find_power_limits_node); 237 238 static const __be32 * 239 mt76_get_of_array(struct device_node *np, char *name, size_t *len, int min) 240 { 241 struct property *prop = of_find_property(np, name, NULL); 242 243 if (!prop || !prop->value || prop->length < min * 4) 244 return NULL; 245 246 *len = prop->length; 247 248 return prop->value; 249 } 250 251 struct device_node * 252 mt76_find_channel_node(struct device_node *np, struct ieee80211_channel *chan) 253 { 254 struct device_node *cur; 255 const __be32 *val; 256 size_t len; 257 258 for_each_child_of_node(np, cur) { 259 val = mt76_get_of_array(cur, "channels", &len, 2); 260 if (!val) 261 continue; 262 263 while (len >= 2 * sizeof(*val)) { 264 if (chan->hw_value >= be32_to_cpu(val[0]) && 265 chan->hw_value <= be32_to_cpu(val[1])) 266 return cur; 267 268 val += 2; 269 len -= 2 * sizeof(*val); 270 } 271 } 272 273 return NULL; 274 } 275 EXPORT_SYMBOL_GPL(mt76_find_channel_node); 276 277 278 static s8 279 mt76_get_txs_delta(struct device_node *np, u8 nss) 280 { 281 const __be32 *val; 282 size_t len; 283 284 val = mt76_get_of_array(np, "txs-delta", &len, nss); 285 if (!val) 286 return 0; 287 288 return be32_to_cpu(val[nss - 1]); 289 } 290 291 static void 292 mt76_apply_array_limit(s8 *pwr, size_t pwr_len, const __be32 *data, 293 s8 target_power, s8 nss_delta, s8 *max_power) 294 { 295 int i; 296 297 if (!data) 298 return; 299 300 for (i = 0; i < pwr_len; i++) { 301 pwr[i] = min_t(s8, target_power, 302 be32_to_cpu(data[i]) + nss_delta); 303 *max_power = max(*max_power, pwr[i]); 304 } 305 } 306 307 static void 308 mt76_apply_multi_array_limit(s8 *pwr, size_t pwr_len, s8 pwr_num, 309 const __be32 *data, size_t len, s8 target_power, 310 s8 nss_delta, s8 *max_power) 311 { 312 int i, cur; 313 314 if (!data) 315 return; 316 317 len /= 4; 318 cur = be32_to_cpu(data[0]); 319 for (i = 0; i < pwr_num; i++) { 320 if (len < pwr_len + 1) 321 break; 322 323 mt76_apply_array_limit(pwr + pwr_len * i, pwr_len, data + 1, 324 target_power, nss_delta, max_power); 325 if (--cur > 0) 326 continue; 327 328 data += pwr_len + 1; 329 len -= pwr_len + 1; 330 if (!len) 331 break; 332 333 cur = be32_to_cpu(data[0]); 334 } 335 } 336 337 s8 mt76_get_rate_power_limits(struct mt76_phy *phy, 338 struct ieee80211_channel *chan, 339 struct mt76_power_limits *dest, 340 s8 target_power) 341 { 342 struct mt76_dev *dev = phy->dev; 343 struct device_node *np; 344 const __be32 *val; 345 char name[16]; 346 u32 mcs_rates = dev->drv->mcs_rates; 347 u32 ru_rates = ARRAY_SIZE(dest->ru[0]); 348 char band; 349 size_t len; 350 s8 max_power = 0; 351 s8 txs_delta; 352 353 if (!mcs_rates) 354 mcs_rates = 10; 355 356 memset(dest, target_power, sizeof(*dest)); 357 358 if (!IS_ENABLED(CONFIG_OF)) 359 return target_power; 360 361 np = mt76_find_power_limits_node(dev); 362 if (!np) 363 return target_power; 364 365 switch (chan->band) { 366 case NL80211_BAND_2GHZ: 367 band = '2'; 368 break; 369 case NL80211_BAND_5GHZ: 370 band = '5'; 371 break; 372 case NL80211_BAND_6GHZ: 373 band = '6'; 374 break; 375 default: 376 return target_power; 377 } 378 379 snprintf(name, sizeof(name), "txpower-%cg", band); 380 np = of_get_child_by_name(np, name); 381 if (!np) 382 return target_power; 383 384 np = mt76_find_channel_node(np, chan); 385 if (!np) 386 return target_power; 387 388 txs_delta = mt76_get_txs_delta(np, hweight16(phy->chainmask)); 389 390 val = mt76_get_of_array(np, "rates-cck", &len, ARRAY_SIZE(dest->cck)); 391 mt76_apply_array_limit(dest->cck, ARRAY_SIZE(dest->cck), val, 392 target_power, txs_delta, &max_power); 393 394 val = mt76_get_of_array(np, "rates-ofdm", 395 &len, ARRAY_SIZE(dest->ofdm)); 396 mt76_apply_array_limit(dest->ofdm, ARRAY_SIZE(dest->ofdm), val, 397 target_power, txs_delta, &max_power); 398 399 val = mt76_get_of_array(np, "rates-mcs", &len, mcs_rates + 1); 400 mt76_apply_multi_array_limit(dest->mcs[0], ARRAY_SIZE(dest->mcs[0]), 401 ARRAY_SIZE(dest->mcs), val, len, 402 target_power, txs_delta, &max_power); 403 404 val = mt76_get_of_array(np, "rates-ru", &len, ru_rates + 1); 405 mt76_apply_multi_array_limit(dest->ru[0], ARRAY_SIZE(dest->ru[0]), 406 ARRAY_SIZE(dest->ru), val, len, 407 target_power, txs_delta, &max_power); 408 409 return max_power; 410 } 411 EXPORT_SYMBOL_GPL(mt76_get_rate_power_limits); 412 413 int 414 mt76_eeprom_init(struct mt76_dev *dev, int len) 415 { 416 dev->eeprom.size = len; 417 dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL); 418 if (!dev->eeprom.data) 419 return -ENOMEM; 420 421 return !mt76_get_of_eeprom(dev, dev->eeprom.data, len); 422 } 423 EXPORT_SYMBOL_GPL(mt76_eeprom_init); 424