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
mt76_get_of_eeprom_data(struct mt76_dev * dev,void * eep,int len)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
mt76_get_of_epprom_from_mtd(struct mt76_dev * dev,void * eep,int offset,int len)31 static int mt76_get_of_epprom_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
mt76_get_of_eeprom_from_nvmem(struct mt76_dev * dev,void * eep,int len)113 static int mt76_get_of_eeprom_from_nvmem(struct mt76_dev *dev, void *eep, int len)
114 {
115 struct device_node *np = dev->dev->of_node;
116 struct nvmem_cell *cell;
117 const void *data;
118 size_t retlen;
119 int ret = 0;
120
121 cell = of_nvmem_cell_get(np, "eeprom");
122 if (IS_ERR(cell))
123 return PTR_ERR(cell);
124
125 data = nvmem_cell_read(cell, &retlen);
126 nvmem_cell_put(cell);
127
128 if (IS_ERR(data))
129 return PTR_ERR(data);
130
131 if (retlen < len) {
132 ret = -EINVAL;
133 goto exit;
134 }
135
136 memcpy(eep, data, len);
137
138 exit:
139 kfree(data);
140
141 return ret;
142 }
143
mt76_get_of_eeprom(struct mt76_dev * dev,void * eep,int offset,int len)144 int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
145 {
146 struct device_node *np = dev->dev->of_node;
147 int ret;
148
149 if (!np)
150 return -ENOENT;
151
152 ret = mt76_get_of_eeprom_data(dev, eep, len);
153 if (!ret)
154 return 0;
155
156 ret = mt76_get_of_epprom_from_mtd(dev, eep, offset, len);
157 if (!ret)
158 return 0;
159
160 return mt76_get_of_eeprom_from_nvmem(dev, eep, len);
161 }
162 EXPORT_SYMBOL_GPL(mt76_get_of_eeprom);
163
164 void
mt76_eeprom_override(struct mt76_phy * phy)165 mt76_eeprom_override(struct mt76_phy *phy)
166 {
167 struct mt76_dev *dev = phy->dev;
168 struct device_node *np = dev->dev->of_node;
169
170 of_get_mac_address(np, phy->macaddr);
171
172 if (!is_valid_ether_addr(phy->macaddr)) {
173 eth_random_addr(phy->macaddr);
174 dev_info(dev->dev,
175 "Invalid MAC address, using random address %pM\n",
176 phy->macaddr);
177 }
178 }
179 EXPORT_SYMBOL_GPL(mt76_eeprom_override);
180
mt76_string_prop_find(struct property * prop,const char * str)181 static bool mt76_string_prop_find(struct property *prop, const char *str)
182 {
183 const char *cp = NULL;
184
185 if (!prop || !str || !str[0])
186 return false;
187
188 while ((cp = of_prop_next_string(prop, cp)) != NULL)
189 if (!strcasecmp(cp, str))
190 return true;
191
192 return false;
193 }
194
195 static struct device_node *
mt76_find_power_limits_node(struct mt76_dev * dev)196 mt76_find_power_limits_node(struct mt76_dev *dev)
197 {
198 struct device_node *np = dev->dev->of_node;
199 const char *const region_names[] = {
200 [NL80211_DFS_UNSET] = "ww",
201 [NL80211_DFS_ETSI] = "etsi",
202 [NL80211_DFS_FCC] = "fcc",
203 [NL80211_DFS_JP] = "jp",
204 };
205 struct device_node *cur, *fallback = NULL;
206 const char *region_name = NULL;
207
208 if (dev->region < ARRAY_SIZE(region_names))
209 region_name = region_names[dev->region];
210
211 np = of_get_child_by_name(np, "power-limits");
212 if (!np)
213 return NULL;
214
215 for_each_child_of_node(np, cur) {
216 struct property *country = of_find_property(cur, "country", NULL);
217 struct property *regd = of_find_property(cur, "regdomain", NULL);
218
219 if (!country && !regd) {
220 fallback = cur;
221 continue;
222 }
223
224 if (mt76_string_prop_find(country, dev->alpha2) ||
225 mt76_string_prop_find(regd, region_name)) {
226 of_node_put(np);
227 return cur;
228 }
229 }
230
231 of_node_put(np);
232 return fallback;
233 }
234
235 static const __be32 *
mt76_get_of_array(struct device_node * np,char * name,size_t * len,int min)236 mt76_get_of_array(struct device_node *np, char *name, size_t *len, int min)
237 {
238 struct property *prop = of_find_property(np, name, NULL);
239
240 if (!prop || !prop->value || prop->length < min * 4)
241 return NULL;
242
243 *len = prop->length;
244
245 return prop->value;
246 }
247
248 static struct device_node *
mt76_find_channel_node(struct device_node * np,struct ieee80211_channel * chan)249 mt76_find_channel_node(struct device_node *np, struct ieee80211_channel *chan)
250 {
251 struct device_node *cur;
252 const __be32 *val;
253 size_t len;
254
255 for_each_child_of_node(np, cur) {
256 val = mt76_get_of_array(cur, "channels", &len, 2);
257 if (!val)
258 continue;
259
260 while (len >= 2 * sizeof(*val)) {
261 if (chan->hw_value >= be32_to_cpu(val[0]) &&
262 chan->hw_value <= be32_to_cpu(val[1]))
263 return cur;
264
265 val += 2;
266 len -= 2 * sizeof(*val);
267 }
268 }
269
270 return NULL;
271 }
272
273 static s8
mt76_get_txs_delta(struct device_node * np,u8 nss)274 mt76_get_txs_delta(struct device_node *np, u8 nss)
275 {
276 const __be32 *val;
277 size_t len;
278
279 val = mt76_get_of_array(np, "txs-delta", &len, nss);
280 if (!val)
281 return 0;
282
283 return be32_to_cpu(val[nss - 1]);
284 }
285
286 static void
mt76_apply_array_limit(s8 * pwr,size_t pwr_len,const __be32 * data,s8 target_power,s8 nss_delta,s8 * max_power)287 mt76_apply_array_limit(s8 *pwr, size_t pwr_len, const __be32 *data,
288 s8 target_power, s8 nss_delta, s8 *max_power)
289 {
290 int i;
291
292 if (!data)
293 return;
294
295 for (i = 0; i < pwr_len; i++) {
296 pwr[i] = min_t(s8, target_power,
297 be32_to_cpu(data[i]) + nss_delta);
298 *max_power = max(*max_power, pwr[i]);
299 }
300 }
301
302 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)303 mt76_apply_multi_array_limit(s8 *pwr, size_t pwr_len, s8 pwr_num,
304 const __be32 *data, size_t len, s8 target_power,
305 s8 nss_delta, s8 *max_power)
306 {
307 int i, cur;
308
309 if (!data)
310 return;
311
312 len /= 4;
313 cur = be32_to_cpu(data[0]);
314 for (i = 0; i < pwr_num; i++) {
315 if (len < pwr_len + 1)
316 break;
317
318 mt76_apply_array_limit(pwr + pwr_len * i, pwr_len, data + 1,
319 target_power, nss_delta, max_power);
320 if (--cur > 0)
321 continue;
322
323 data += pwr_len + 1;
324 len -= pwr_len + 1;
325 if (!len)
326 break;
327
328 cur = be32_to_cpu(data[0]);
329 }
330 }
331
mt76_get_rate_power_limits(struct mt76_phy * phy,struct ieee80211_channel * chan,struct mt76_power_limits * dest,s8 target_power)332 s8 mt76_get_rate_power_limits(struct mt76_phy *phy,
333 struct ieee80211_channel *chan,
334 struct mt76_power_limits *dest,
335 s8 target_power)
336 {
337 struct mt76_dev *dev = phy->dev;
338 struct device_node *np;
339 const __be32 *val;
340 char name[16];
341 u32 mcs_rates = dev->drv->mcs_rates;
342 u32 ru_rates = ARRAY_SIZE(dest->ru[0]);
343 char band;
344 size_t len;
345 s8 max_power = 0;
346 s8 txs_delta;
347
348 if (!mcs_rates)
349 mcs_rates = 10;
350
351 memset(dest, target_power, sizeof(*dest));
352
353 if (!IS_ENABLED(CONFIG_OF))
354 return target_power;
355
356 np = mt76_find_power_limits_node(dev);
357 if (!np)
358 return target_power;
359
360 switch (chan->band) {
361 case NL80211_BAND_2GHZ:
362 band = '2';
363 break;
364 case NL80211_BAND_5GHZ:
365 band = '5';
366 break;
367 case NL80211_BAND_6GHZ:
368 band = '6';
369 break;
370 default:
371 return target_power;
372 }
373
374 snprintf(name, sizeof(name), "txpower-%cg", band);
375 np = of_get_child_by_name(np, name);
376 if (!np)
377 return target_power;
378
379 np = mt76_find_channel_node(np, chan);
380 if (!np)
381 return target_power;
382
383 txs_delta = mt76_get_txs_delta(np, hweight8(phy->antenna_mask));
384
385 val = mt76_get_of_array(np, "rates-cck", &len, ARRAY_SIZE(dest->cck));
386 mt76_apply_array_limit(dest->cck, ARRAY_SIZE(dest->cck), val,
387 target_power, txs_delta, &max_power);
388
389 val = mt76_get_of_array(np, "rates-ofdm",
390 &len, ARRAY_SIZE(dest->ofdm));
391 mt76_apply_array_limit(dest->ofdm, ARRAY_SIZE(dest->ofdm), val,
392 target_power, txs_delta, &max_power);
393
394 val = mt76_get_of_array(np, "rates-mcs", &len, mcs_rates + 1);
395 mt76_apply_multi_array_limit(dest->mcs[0], ARRAY_SIZE(dest->mcs[0]),
396 ARRAY_SIZE(dest->mcs), val, len,
397 target_power, txs_delta, &max_power);
398
399 val = mt76_get_of_array(np, "rates-ru", &len, ru_rates + 1);
400 mt76_apply_multi_array_limit(dest->ru[0], ARRAY_SIZE(dest->ru[0]),
401 ARRAY_SIZE(dest->ru), val, len,
402 target_power, txs_delta, &max_power);
403
404 return max_power;
405 }
406 EXPORT_SYMBOL_GPL(mt76_get_rate_power_limits);
407
408 int
mt76_eeprom_init(struct mt76_dev * dev,int len)409 mt76_eeprom_init(struct mt76_dev *dev, int len)
410 {
411 dev->eeprom.size = len;
412 dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
413 if (!dev->eeprom.data)
414 return -ENOMEM;
415
416 return !mt76_get_of_eeprom(dev, dev->eeprom.data, 0, len);
417 }
418 EXPORT_SYMBOL_GPL(mt76_eeprom_init);
419