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/etherdevice.h> 10 #include "mt76.h" 11 12 int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len) 13 { 14 #if defined(CONFIG_OF) && defined(CONFIG_MTD) 15 struct device_node *np = dev->dev->of_node; 16 struct mtd_info *mtd; 17 const __be32 *list; 18 const void *data; 19 const char *part; 20 phandle phandle; 21 int size; 22 size_t retlen; 23 int ret; 24 25 if (!np) 26 return -ENOENT; 27 28 data = of_get_property(np, "mediatek,eeprom-data", &size); 29 if (data) { 30 if (size > len) 31 return -EINVAL; 32 33 memcpy(eep, data, size); 34 35 return 0; 36 } 37 38 list = of_get_property(np, "mediatek,mtd-eeprom", &size); 39 if (!list) 40 return -ENOENT; 41 42 phandle = be32_to_cpup(list++); 43 if (!phandle) 44 return -ENOENT; 45 46 np = of_find_node_by_phandle(phandle); 47 if (!np) 48 return -EINVAL; 49 50 part = of_get_property(np, "label", NULL); 51 if (!part) 52 part = np->name; 53 54 mtd = get_mtd_device_nm(part); 55 if (IS_ERR(mtd)) { 56 ret = PTR_ERR(mtd); 57 goto out_put_node; 58 } 59 60 if (size <= sizeof(*list)) { 61 ret = -EINVAL; 62 goto out_put_node; 63 } 64 65 offset = be32_to_cpup(list); 66 ret = mtd_read(mtd, offset, len, &retlen, eep); 67 put_mtd_device(mtd); 68 if (mtd_is_bitflip(ret)) 69 ret = 0; 70 if (ret) { 71 dev_err(dev->dev, "reading EEPROM from mtd %s failed: %i\n", 72 part, ret); 73 goto out_put_node; 74 } 75 76 if (retlen < len) { 77 ret = -EINVAL; 78 goto out_put_node; 79 } 80 81 if (of_property_read_bool(dev->dev->of_node, "big-endian")) { 82 u8 *data = (u8 *)eep; 83 int i; 84 85 /* convert eeprom data in Little Endian */ 86 for (i = 0; i < round_down(len, 2); i += 2) 87 put_unaligned_le16(get_unaligned_be16(&data[i]), 88 &data[i]); 89 } 90 91 #ifdef CONFIG_NL80211_TESTMODE 92 dev->test_mtd.name = devm_kstrdup(dev->dev, part, GFP_KERNEL); 93 dev->test_mtd.offset = offset; 94 #endif 95 96 out_put_node: 97 of_node_put(np); 98 return ret; 99 #else 100 return -ENOENT; 101 #endif 102 } 103 EXPORT_SYMBOL_GPL(mt76_get_of_eeprom); 104 105 void 106 mt76_eeprom_override(struct mt76_phy *phy) 107 { 108 struct mt76_dev *dev = phy->dev; 109 struct device_node *np = dev->dev->of_node; 110 111 of_get_mac_address(np, phy->macaddr); 112 113 if (!is_valid_ether_addr(phy->macaddr)) { 114 eth_random_addr(phy->macaddr); 115 dev_info(dev->dev, 116 "Invalid MAC address, using random address %pM\n", 117 phy->macaddr); 118 } 119 } 120 EXPORT_SYMBOL_GPL(mt76_eeprom_override); 121 122 static bool mt76_string_prop_find(struct property *prop, const char *str) 123 { 124 const char *cp = NULL; 125 126 if (!prop || !str || !str[0]) 127 return false; 128 129 while ((cp = of_prop_next_string(prop, cp)) != NULL) 130 if (!strcasecmp(cp, str)) 131 return true; 132 133 return false; 134 } 135 136 static struct device_node * 137 mt76_find_power_limits_node(struct mt76_dev *dev) 138 { 139 struct device_node *np = dev->dev->of_node; 140 const char *const region_names[] = { 141 [NL80211_DFS_ETSI] = "etsi", 142 [NL80211_DFS_FCC] = "fcc", 143 [NL80211_DFS_JP] = "jp", 144 }; 145 struct device_node *cur, *fallback = NULL; 146 const char *region_name = NULL; 147 148 if (dev->region < ARRAY_SIZE(region_names)) 149 region_name = region_names[dev->region]; 150 151 np = of_get_child_by_name(np, "power-limits"); 152 if (!np) 153 return NULL; 154 155 for_each_child_of_node(np, cur) { 156 struct property *country = of_find_property(cur, "country", NULL); 157 struct property *regd = of_find_property(cur, "regdomain", NULL); 158 159 if (!country && !regd) { 160 fallback = cur; 161 continue; 162 } 163 164 if (mt76_string_prop_find(country, dev->alpha2) || 165 mt76_string_prop_find(regd, region_name)) { 166 of_node_put(np); 167 return cur; 168 } 169 } 170 171 of_node_put(np); 172 return fallback; 173 } 174 175 static const __be32 * 176 mt76_get_of_array(struct device_node *np, char *name, size_t *len, int min) 177 { 178 struct property *prop = of_find_property(np, name, NULL); 179 180 if (!prop || !prop->value || prop->length < min * 4) 181 return NULL; 182 183 *len = prop->length; 184 185 return prop->value; 186 } 187 188 static struct device_node * 189 mt76_find_channel_node(struct device_node *np, struct ieee80211_channel *chan) 190 { 191 struct device_node *cur; 192 const __be32 *val; 193 size_t len; 194 195 for_each_child_of_node(np, cur) { 196 val = mt76_get_of_array(cur, "channels", &len, 2); 197 if (!val) 198 continue; 199 200 while (len >= 2 * sizeof(*val)) { 201 if (chan->hw_value >= be32_to_cpu(val[0]) && 202 chan->hw_value <= be32_to_cpu(val[1])) 203 return cur; 204 205 val += 2; 206 len -= 2 * sizeof(*val); 207 } 208 } 209 210 return NULL; 211 } 212 213 static s8 214 mt76_get_txs_delta(struct device_node *np, u8 nss) 215 { 216 const __be32 *val; 217 size_t len; 218 219 val = mt76_get_of_array(np, "txs-delta", &len, nss); 220 if (!val) 221 return 0; 222 223 return be32_to_cpu(val[nss - 1]); 224 } 225 226 static void 227 mt76_apply_array_limit(s8 *pwr, size_t pwr_len, const __be32 *data, 228 s8 target_power, s8 nss_delta, s8 *max_power) 229 { 230 int i; 231 232 if (!data) 233 return; 234 235 for (i = 0; i < pwr_len; i++) { 236 pwr[i] = min_t(s8, target_power, 237 be32_to_cpu(data[i]) + nss_delta); 238 *max_power = max(*max_power, pwr[i]); 239 } 240 } 241 242 static void 243 mt76_apply_multi_array_limit(s8 *pwr, size_t pwr_len, s8 pwr_num, 244 const __be32 *data, size_t len, s8 target_power, 245 s8 nss_delta, s8 *max_power) 246 { 247 int i, cur; 248 249 if (!data) 250 return; 251 252 len /= 4; 253 cur = be32_to_cpu(data[0]); 254 for (i = 0; i < pwr_num; i++) { 255 if (len < pwr_len + 1) 256 break; 257 258 mt76_apply_array_limit(pwr + pwr_len * i, pwr_len, data + 1, 259 target_power, nss_delta, max_power); 260 if (--cur > 0) 261 continue; 262 263 data += pwr_len + 1; 264 len -= pwr_len + 1; 265 if (!len) 266 break; 267 268 cur = be32_to_cpu(data[0]); 269 } 270 } 271 272 s8 mt76_get_rate_power_limits(struct mt76_phy *phy, 273 struct ieee80211_channel *chan, 274 struct mt76_power_limits *dest, 275 s8 target_power) 276 { 277 struct mt76_dev *dev = phy->dev; 278 struct device_node *np; 279 const __be32 *val; 280 char name[16]; 281 u32 mcs_rates = dev->drv->mcs_rates; 282 u32 ru_rates = ARRAY_SIZE(dest->ru[0]); 283 char band; 284 size_t len; 285 s8 max_power = 0; 286 s8 txs_delta; 287 288 if (!mcs_rates) 289 mcs_rates = 10; 290 291 memset(dest, target_power, sizeof(*dest)); 292 293 if (!IS_ENABLED(CONFIG_OF)) 294 return target_power; 295 296 np = mt76_find_power_limits_node(dev); 297 if (!np) 298 return target_power; 299 300 switch (chan->band) { 301 case NL80211_BAND_2GHZ: 302 band = '2'; 303 break; 304 case NL80211_BAND_5GHZ: 305 band = '5'; 306 break; 307 case NL80211_BAND_6GHZ: 308 band = '6'; 309 break; 310 default: 311 return target_power; 312 } 313 314 snprintf(name, sizeof(name), "txpower-%cg", band); 315 np = of_get_child_by_name(np, name); 316 if (!np) 317 return target_power; 318 319 np = mt76_find_channel_node(np, chan); 320 if (!np) 321 return target_power; 322 323 txs_delta = mt76_get_txs_delta(np, hweight8(phy->antenna_mask)); 324 325 val = mt76_get_of_array(np, "rates-cck", &len, ARRAY_SIZE(dest->cck)); 326 mt76_apply_array_limit(dest->cck, ARRAY_SIZE(dest->cck), val, 327 target_power, txs_delta, &max_power); 328 329 val = mt76_get_of_array(np, "rates-ofdm", 330 &len, ARRAY_SIZE(dest->ofdm)); 331 mt76_apply_array_limit(dest->ofdm, ARRAY_SIZE(dest->ofdm), val, 332 target_power, txs_delta, &max_power); 333 334 val = mt76_get_of_array(np, "rates-mcs", &len, mcs_rates + 1); 335 mt76_apply_multi_array_limit(dest->mcs[0], ARRAY_SIZE(dest->mcs[0]), 336 ARRAY_SIZE(dest->mcs), val, len, 337 target_power, txs_delta, &max_power); 338 339 val = mt76_get_of_array(np, "rates-ru", &len, ru_rates + 1); 340 mt76_apply_multi_array_limit(dest->ru[0], ARRAY_SIZE(dest->ru[0]), 341 ARRAY_SIZE(dest->ru), val, len, 342 target_power, txs_delta, &max_power); 343 344 return max_power; 345 } 346 EXPORT_SYMBOL_GPL(mt76_get_rate_power_limits); 347 348 int 349 mt76_eeprom_init(struct mt76_dev *dev, int len) 350 { 351 dev->eeprom.size = len; 352 dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL); 353 if (!dev->eeprom.data) 354 return -ENOMEM; 355 356 return !mt76_get_of_eeprom(dev, dev->eeprom.data, 0, len); 357 } 358 EXPORT_SYMBOL_GPL(mt76_eeprom_init); 359