1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
4 */
5 #if defined(CONFIG_OF) && defined(CONFIG_MTD)
6 #include <linux/of.h>
7 #include <linux/of_net.h>
8 #include <linux/mtd/mtd.h>
9 #include <linux/mtd/partitions.h>
10 #include <linux/nvmem-consumer.h>
11 #endif
12 #include <linux/etherdevice.h>
13 #include "mt76.h"
14
15 #if defined(CONFIG_OF)
mt76_get_of_eeprom_data(struct mt76_dev * dev,void * eep,int len)16 static int mt76_get_of_eeprom_data(struct mt76_dev *dev, void *eep, int len)
17 {
18 struct device_node *np = dev->dev->of_node;
19 const void *data;
20 int size;
21
22 data = of_get_property(np, "mediatek,eeprom-data", &size);
23 if (!data)
24 return -ENOENT;
25
26 if (size > len)
27 return -EINVAL;
28
29 memcpy(eep, data, size);
30
31 return 0;
32 }
33 #endif
34
mt76_get_of_data_from_mtd(struct mt76_dev * dev,void * eep,int offset,int len)35 int mt76_get_of_data_from_mtd(struct mt76_dev *dev, void *eep, int offset, int len)
36 {
37 #if !defined(CONFIG_MTD) || !defined(CONFIG_OF)
38 return -ENOENT;
39 #else
40 struct device_node *np = dev->dev->of_node;
41 struct mtd_info *mtd;
42 const __be32 *list;
43 const char *part;
44 phandle phandle;
45 size_t retlen;
46 int size;
47 int ret;
48
49 list = of_get_property(np, "mediatek,mtd-eeprom", &size);
50 if (!list)
51 return -ENOENT;
52
53 phandle = be32_to_cpup(list++);
54 if (!phandle)
55 return -ENOENT;
56
57 np = of_find_node_by_phandle(phandle);
58 if (!np)
59 return -EINVAL;
60
61 part = of_get_property(np, "label", NULL);
62 if (!part)
63 part = np->name;
64
65 mtd = get_mtd_device_nm(part);
66 if (IS_ERR(mtd)) {
67 ret = PTR_ERR(mtd);
68 goto out_put_node;
69 }
70
71 if (size <= sizeof(*list)) {
72 ret = -EINVAL;
73 goto out_put_node;
74 }
75
76 offset += be32_to_cpup(list);
77 ret = mtd_read(mtd, offset, len, &retlen, eep);
78 put_mtd_device(mtd);
79 if (mtd_is_bitflip(ret))
80 ret = 0;
81 if (ret) {
82 dev_err(dev->dev, "reading EEPROM from mtd %s failed: %i\n",
83 part, ret);
84 goto out_put_node;
85 }
86
87 if (retlen < len) {
88 ret = -EINVAL;
89 goto out_put_node;
90 }
91
92 if (of_property_read_bool(dev->dev->of_node, "big-endian")) {
93 u8 *data = (u8 *)eep;
94 int i;
95
96 /* convert eeprom data in Little Endian */
97 for (i = 0; i < round_down(len, 2); i += 2)
98 put_unaligned_le16(get_unaligned_be16(&data[i]),
99 &data[i]);
100 }
101
102 #ifdef CONFIG_NL80211_TESTMODE
103 dev->test_mtd.name = devm_kstrdup(dev->dev, part, GFP_KERNEL);
104 if (!dev->test_mtd.name) {
105 ret = -ENOMEM;
106 goto out_put_node;
107 }
108 dev->test_mtd.offset = offset;
109 #endif
110
111 out_put_node:
112 of_node_put(np);
113 return ret;
114 #endif
115 }
116 EXPORT_SYMBOL_GPL(mt76_get_of_data_from_mtd);
117
mt76_get_of_data_from_nvmem(struct mt76_dev * dev,void * eep,const char * cell_name,int len)118 int mt76_get_of_data_from_nvmem(struct mt76_dev *dev, void *eep,
119 const char *cell_name, int len)
120 {
121 #if !defined(CONFIG_OF)
122 return -EOPNOTSUPP;
123 #else
124 struct device_node *np = dev->dev->of_node;
125 struct nvmem_cell *cell;
126 const void *data;
127 size_t retlen;
128 int ret = 0;
129
130 cell = of_nvmem_cell_get(np, cell_name);
131 if (IS_ERR(cell))
132 return PTR_ERR(cell);
133
134 data = nvmem_cell_read(cell, &retlen);
135 nvmem_cell_put(cell);
136
137 if (IS_ERR(data))
138 return PTR_ERR(data);
139
140 if (retlen < len) {
141 ret = -EINVAL;
142 goto exit;
143 }
144
145 memcpy(eep, data, len);
146
147 exit:
148 kfree(data);
149
150 return ret;
151 #endif
152 }
153 EXPORT_SYMBOL_GPL(mt76_get_of_data_from_nvmem);
154
mt76_get_of_eeprom(struct mt76_dev * dev,void * eep,int len)155 static int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int len)
156 {
157 #if !defined(CONFIG_MTD) || !defined(CONFIG_OF)
158 return -ENOENT;
159 #else
160 struct device_node *np = dev->dev->of_node;
161 int ret;
162
163 if (!np)
164 return -ENOENT;
165
166 ret = mt76_get_of_eeprom_data(dev, eep, len);
167 if (!ret)
168 return 0;
169
170 ret = mt76_get_of_data_from_mtd(dev, eep, 0, len);
171 if (!ret)
172 return 0;
173
174 return mt76_get_of_data_from_nvmem(dev, eep, "eeprom", len);
175 #endif
176 }
177
178 void
mt76_eeprom_override(struct mt76_phy * phy)179 mt76_eeprom_override(struct mt76_phy *phy)
180 {
181 struct mt76_dev *dev = phy->dev;
182 #if defined(CONFIG_OF)
183 struct device_node *np = dev->dev->of_node;
184
185 of_get_mac_address(np, phy->macaddr);
186
187 if (!is_valid_ether_addr(phy->macaddr)) {
188 #endif
189 eth_random_addr(phy->macaddr);
190 dev_info(dev->dev,
191 "Invalid MAC address, using random address %pM\n",
192 phy->macaddr);
193 #if defined(CONFIG_OF)
194 }
195 #endif
196 }
197 EXPORT_SYMBOL_GPL(mt76_eeprom_override);
198
199 #if defined(CONFIG_OF)
mt76_string_prop_find(struct property * prop,const char * str)200 static bool mt76_string_prop_find(struct property *prop, const char *str)
201 {
202 const char *cp = NULL;
203
204 if (!prop || !str || !str[0])
205 return false;
206
207 while ((cp = of_prop_next_string(prop, cp)) != NULL)
208 if (!strcasecmp(cp, str))
209 return true;
210 return false;
211 }
212 #endif
213
214 struct device_node *
mt76_find_power_limits_node(struct mt76_dev * dev)215 mt76_find_power_limits_node(struct mt76_dev *dev)
216 {
217 #if !defined(CONFIG_OF)
218 return NULL;
219 #else
220 struct device_node *np = dev->dev->of_node;
221 const char *const region_names[] = {
222 [NL80211_DFS_UNSET] = "ww",
223 [NL80211_DFS_ETSI] = "etsi",
224 [NL80211_DFS_FCC] = "fcc",
225 [NL80211_DFS_JP] = "jp",
226 };
227 struct device_node *cur, *fallback = NULL;
228 const char *region_name = NULL;
229
230 if (dev->region < ARRAY_SIZE(region_names))
231 region_name = region_names[dev->region];
232
233 np = of_get_child_by_name(np, "power-limits");
234 if (!np)
235 return NULL;
236
237 for_each_child_of_node(np, cur) {
238 struct property *country = of_find_property(cur, "country", NULL);
239 struct property *regd = of_find_property(cur, "regdomain", NULL);
240
241 if (!country && !regd) {
242 fallback = cur;
243 continue;
244 }
245
246 if (mt76_string_prop_find(country, dev->alpha2) ||
247 mt76_string_prop_find(regd, region_name)) {
248 of_node_put(np);
249 return cur;
250 }
251 }
252
253 of_node_put(np);
254 return fallback;
255 #endif
256 }
257 EXPORT_SYMBOL_GPL(mt76_find_power_limits_node);
258
259 #if defined(CONFIG_OF)
260 static const __be32 *
mt76_get_of_array(struct device_node * np,char * name,size_t * len,int min)261 mt76_get_of_array(struct device_node *np, char *name, size_t *len, int min)
262 {
263 struct property *prop = of_find_property(np, name, NULL);
264
265 if (!prop || !prop->value || prop->length < min * 4)
266 return NULL;
267
268 *len = prop->length;
269
270 return prop->value;
271 }
272 #endif
273
274 struct device_node *
mt76_find_channel_node(struct device_node * np,struct ieee80211_channel * chan)275 mt76_find_channel_node(struct device_node *np, struct ieee80211_channel *chan)
276 {
277 #if defined(CONFIG_OF)
278 struct device_node *cur;
279 const __be32 *val;
280 size_t len;
281
282 for_each_child_of_node(np, cur) {
283 val = mt76_get_of_array(cur, "channels", &len, 2);
284 if (!val)
285 continue;
286
287 while (len >= 2 * sizeof(*val)) {
288 if (chan->hw_value >= be32_to_cpu(val[0]) &&
289 chan->hw_value <= be32_to_cpu(val[1]))
290 return cur;
291
292 val += 2;
293 len -= 2 * sizeof(*val);
294 }
295 }
296 #endif
297 return NULL;
298 }
299 EXPORT_SYMBOL_GPL(mt76_find_channel_node);
300
301 #if defined(CONFIG_OF)
302 static s8
mt76_get_txs_delta(struct device_node * np,u8 nss)303 mt76_get_txs_delta(struct device_node *np, u8 nss)
304 {
305 const __be32 *val;
306 size_t len;
307
308 val = mt76_get_of_array(np, "txs-delta", &len, nss);
309 if (!val)
310 return 0;
311
312 return be32_to_cpu(val[nss - 1]);
313 }
314
315 static void
mt76_apply_array_limit(s8 * pwr,size_t pwr_len,const __be32 * data,s8 target_power,s8 nss_delta,s8 * max_power)316 mt76_apply_array_limit(s8 *pwr, size_t pwr_len, const __be32 *data,
317 s8 target_power, s8 nss_delta, s8 *max_power)
318 {
319 int i;
320
321 if (!data)
322 return;
323
324 for (i = 0; i < pwr_len; i++) {
325 pwr[i] = min_t(s8, target_power,
326 be32_to_cpu(data[i]) + nss_delta);
327 *max_power = max(*max_power, pwr[i]);
328 }
329 }
330
331 static void
mt76_apply_multi_array_limit(s8 * pwr,size_t pwr_len,s8 pwr_num,const __be32 * data,size_t len,s8 target_power,s8 nss_delta,s8 * max_power)332 mt76_apply_multi_array_limit(s8 *pwr, size_t pwr_len, s8 pwr_num,
333 const __be32 *data, size_t len, s8 target_power,
334 s8 nss_delta, s8 *max_power)
335 {
336 int i, cur;
337
338 if (!data)
339 return;
340
341 len /= 4;
342 cur = be32_to_cpu(data[0]);
343 for (i = 0; i < pwr_num; i++) {
344 if (len < pwr_len + 1)
345 break;
346
347 mt76_apply_array_limit(pwr + pwr_len * i, pwr_len, data + 1,
348 target_power, nss_delta, max_power);
349 if (--cur > 0)
350 continue;
351
352 data += pwr_len + 1;
353 len -= pwr_len + 1;
354 if (!len)
355 break;
356
357 cur = be32_to_cpu(data[0]);
358 }
359 }
360 #endif
361
mt76_get_rate_power_limits(struct mt76_phy * phy,struct ieee80211_channel * chan,struct mt76_power_limits * dest,s8 target_power)362 s8 mt76_get_rate_power_limits(struct mt76_phy *phy,
363 struct ieee80211_channel *chan,
364 struct mt76_power_limits *dest,
365 s8 target_power)
366 {
367 struct mt76_dev *dev = phy->dev;
368 #if defined(CONFIG_OF)
369 struct device_node *np;
370 const __be32 *val;
371 char name[16];
372 #endif
373 u32 mcs_rates = dev->drv->mcs_rates;
374 #if defined(CONFIG_OF)
375 u32 ru_rates = ARRAY_SIZE(dest->ru[0]);
376 char band;
377 size_t len;
378 #endif
379 s8 max_power = 0;
380 #if defined(CONFIG_OF)
381 s8 txs_delta;
382 #endif
383
384 if (!mcs_rates)
385 mcs_rates = 10;
386
387 memset(dest, target_power, sizeof(*dest));
388
389 if (!IS_ENABLED(CONFIG_OF))
390 return target_power;
391
392 #if defined(CONFIG_OF)
393 np = mt76_find_power_limits_node(dev);
394 if (!np)
395 return target_power;
396
397 switch (chan->band) {
398 case NL80211_BAND_2GHZ:
399 band = '2';
400 break;
401 case NL80211_BAND_5GHZ:
402 band = '5';
403 break;
404 case NL80211_BAND_6GHZ:
405 band = '6';
406 break;
407 default:
408 return target_power;
409 }
410
411 snprintf(name, sizeof(name), "txpower-%cg", band);
412 np = of_get_child_by_name(np, name);
413 if (!np)
414 return target_power;
415
416 np = mt76_find_channel_node(np, chan);
417 if (!np)
418 return target_power;
419
420 txs_delta = mt76_get_txs_delta(np, hweight16(phy->chainmask));
421
422 val = mt76_get_of_array(np, "rates-cck", &len, ARRAY_SIZE(dest->cck));
423 mt76_apply_array_limit(dest->cck, ARRAY_SIZE(dest->cck), val,
424 target_power, txs_delta, &max_power);
425
426 val = mt76_get_of_array(np, "rates-ofdm",
427 &len, ARRAY_SIZE(dest->ofdm));
428 mt76_apply_array_limit(dest->ofdm, ARRAY_SIZE(dest->ofdm), val,
429 target_power, txs_delta, &max_power);
430
431 val = mt76_get_of_array(np, "rates-mcs", &len, mcs_rates + 1);
432 mt76_apply_multi_array_limit(dest->mcs[0], ARRAY_SIZE(dest->mcs[0]),
433 ARRAY_SIZE(dest->mcs), val, len,
434 target_power, txs_delta, &max_power);
435
436 val = mt76_get_of_array(np, "rates-ru", &len, ru_rates + 1);
437 mt76_apply_multi_array_limit(dest->ru[0], ARRAY_SIZE(dest->ru[0]),
438 ARRAY_SIZE(dest->ru), val, len,
439 target_power, txs_delta, &max_power);
440
441 #endif
442 return max_power;
443 }
444 EXPORT_SYMBOL_GPL(mt76_get_rate_power_limits);
445
446 int
mt76_eeprom_init(struct mt76_dev * dev,int len)447 mt76_eeprom_init(struct mt76_dev *dev, int len)
448 {
449 dev->eeprom.size = len;
450 dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
451 if (!dev->eeprom.data)
452 return -ENOMEM;
453
454 return !mt76_get_of_eeprom(dev, dev->eeprom.data, len);
455 }
456 EXPORT_SYMBOL_GPL(mt76_eeprom_init);
457