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