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 dev->test_mtd.offset = offset;
99 #endif
100
101 out_put_node:
102 of_node_put(np);
103 return ret;
104 #else
105 return -ENOENT;
106 #endif
107 }
108
mt76_get_of_eeprom_from_nvmem(struct mt76_dev * dev,void * eep,int len)109 static int mt76_get_of_eeprom_from_nvmem(struct mt76_dev *dev, void *eep, int len)
110 {
111 struct device_node *np = dev->dev->of_node;
112 struct nvmem_cell *cell;
113 const void *data;
114 size_t retlen;
115 int ret = 0;
116
117 cell = of_nvmem_cell_get(np, "eeprom");
118 if (IS_ERR(cell))
119 return PTR_ERR(cell);
120
121 data = nvmem_cell_read(cell, &retlen);
122 nvmem_cell_put(cell);
123
124 if (IS_ERR(data))
125 return PTR_ERR(data);
126
127 if (retlen < len) {
128 ret = -EINVAL;
129 goto exit;
130 }
131
132 memcpy(eep, data, len);
133
134 exit:
135 kfree(data);
136
137 return ret;
138 }
139
mt76_get_of_eeprom(struct mt76_dev * dev,void * eep,int offset,int len)140 int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
141 {
142 struct device_node *np = dev->dev->of_node;
143 int ret;
144
145 if (!np)
146 return -ENOENT;
147
148 ret = mt76_get_of_eeprom_data(dev, eep, len);
149 if (!ret)
150 return 0;
151
152 ret = mt76_get_of_epprom_from_mtd(dev, eep, offset, len);
153 if (!ret)
154 return 0;
155
156 return mt76_get_of_eeprom_from_nvmem(dev, eep, len);
157 }
158 EXPORT_SYMBOL_GPL(mt76_get_of_eeprom);
159
160 void
mt76_eeprom_override(struct mt76_phy * phy)161 mt76_eeprom_override(struct mt76_phy *phy)
162 {
163 struct mt76_dev *dev = phy->dev;
164 struct device_node *np = dev->dev->of_node;
165
166 of_get_mac_address(np, phy->macaddr);
167
168 if (!is_valid_ether_addr(phy->macaddr)) {
169 eth_random_addr(phy->macaddr);
170 dev_info(dev->dev,
171 "Invalid MAC address, using random address %pM\n",
172 phy->macaddr);
173 }
174 }
175 EXPORT_SYMBOL_GPL(mt76_eeprom_override);
176
mt76_string_prop_find(struct property * prop,const char * str)177 static bool mt76_string_prop_find(struct property *prop, const char *str)
178 {
179 const char *cp = NULL;
180
181 if (!prop || !str || !str[0])
182 return false;
183
184 while ((cp = of_prop_next_string(prop, cp)) != NULL)
185 if (!strcasecmp(cp, str))
186 return true;
187
188 return false;
189 }
190
191 static struct device_node *
mt76_find_power_limits_node(struct mt76_dev * dev)192 mt76_find_power_limits_node(struct mt76_dev *dev)
193 {
194 struct device_node *np = dev->dev->of_node;
195 const char *const region_names[] = {
196 [NL80211_DFS_UNSET] = "ww",
197 [NL80211_DFS_ETSI] = "etsi",
198 [NL80211_DFS_FCC] = "fcc",
199 [NL80211_DFS_JP] = "jp",
200 };
201 struct device_node *cur, *fallback = NULL;
202 const char *region_name = NULL;
203
204 if (dev->region < ARRAY_SIZE(region_names))
205 region_name = region_names[dev->region];
206
207 np = of_get_child_by_name(np, "power-limits");
208 if (!np)
209 return NULL;
210
211 for_each_child_of_node(np, cur) {
212 struct property *country = of_find_property(cur, "country", NULL);
213 struct property *regd = of_find_property(cur, "regdomain", NULL);
214
215 if (!country && !regd) {
216 fallback = cur;
217 continue;
218 }
219
220 if (mt76_string_prop_find(country, dev->alpha2) ||
221 mt76_string_prop_find(regd, region_name)) {
222 of_node_put(np);
223 return cur;
224 }
225 }
226
227 of_node_put(np);
228 return fallback;
229 }
230
231 static const __be32 *
mt76_get_of_array(struct device_node * np,char * name,size_t * len,int min)232 mt76_get_of_array(struct device_node *np, char *name, size_t *len, int min)
233 {
234 struct property *prop = of_find_property(np, name, NULL);
235
236 if (!prop || !prop->value || prop->length < min * 4)
237 return NULL;
238
239 *len = prop->length;
240
241 return prop->value;
242 }
243
244 static struct device_node *
mt76_find_channel_node(struct device_node * np,struct ieee80211_channel * chan)245 mt76_find_channel_node(struct device_node *np, struct ieee80211_channel *chan)
246 {
247 struct device_node *cur;
248 const __be32 *val;
249 size_t len;
250
251 for_each_child_of_node(np, cur) {
252 val = mt76_get_of_array(cur, "channels", &len, 2);
253 if (!val)
254 continue;
255
256 while (len >= 2 * sizeof(*val)) {
257 if (chan->hw_value >= be32_to_cpu(val[0]) &&
258 chan->hw_value <= be32_to_cpu(val[1]))
259 return cur;
260
261 val += 2;
262 len -= 2 * sizeof(*val);
263 }
264 }
265
266 return NULL;
267 }
268
269 static s8
mt76_get_txs_delta(struct device_node * np,u8 nss)270 mt76_get_txs_delta(struct device_node *np, u8 nss)
271 {
272 const __be32 *val;
273 size_t len;
274
275 val = mt76_get_of_array(np, "txs-delta", &len, nss);
276 if (!val)
277 return 0;
278
279 return be32_to_cpu(val[nss - 1]);
280 }
281
282 static void
mt76_apply_array_limit(s8 * pwr,size_t pwr_len,const __be32 * data,s8 target_power,s8 nss_delta,s8 * max_power)283 mt76_apply_array_limit(s8 *pwr, size_t pwr_len, const __be32 *data,
284 s8 target_power, s8 nss_delta, s8 *max_power)
285 {
286 int i;
287
288 if (!data)
289 return;
290
291 for (i = 0; i < pwr_len; i++) {
292 pwr[i] = min_t(s8, target_power,
293 be32_to_cpu(data[i]) + nss_delta);
294 *max_power = max(*max_power, pwr[i]);
295 }
296 }
297
298 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)299 mt76_apply_multi_array_limit(s8 *pwr, size_t pwr_len, s8 pwr_num,
300 const __be32 *data, size_t len, s8 target_power,
301 s8 nss_delta, s8 *max_power)
302 {
303 int i, cur;
304
305 if (!data)
306 return;
307
308 len /= 4;
309 cur = be32_to_cpu(data[0]);
310 for (i = 0; i < pwr_num; i++) {
311 if (len < pwr_len + 1)
312 break;
313
314 mt76_apply_array_limit(pwr + pwr_len * i, pwr_len, data + 1,
315 target_power, nss_delta, max_power);
316 if (--cur > 0)
317 continue;
318
319 data += pwr_len + 1;
320 len -= pwr_len + 1;
321 if (!len)
322 break;
323
324 cur = be32_to_cpu(data[0]);
325 }
326 }
327
mt76_get_rate_power_limits(struct mt76_phy * phy,struct ieee80211_channel * chan,struct mt76_power_limits * dest,s8 target_power)328 s8 mt76_get_rate_power_limits(struct mt76_phy *phy,
329 struct ieee80211_channel *chan,
330 struct mt76_power_limits *dest,
331 s8 target_power)
332 {
333 struct mt76_dev *dev = phy->dev;
334 struct device_node *np;
335 const __be32 *val;
336 char name[16];
337 u32 mcs_rates = dev->drv->mcs_rates;
338 u32 ru_rates = ARRAY_SIZE(dest->ru[0]);
339 char band;
340 size_t len;
341 s8 max_power = 0;
342 s8 txs_delta;
343
344 if (!mcs_rates)
345 mcs_rates = 10;
346
347 memset(dest, target_power, sizeof(*dest));
348
349 if (!IS_ENABLED(CONFIG_OF))
350 return target_power;
351
352 np = mt76_find_power_limits_node(dev);
353 if (!np)
354 return target_power;
355
356 switch (chan->band) {
357 case NL80211_BAND_2GHZ:
358 band = '2';
359 break;
360 case NL80211_BAND_5GHZ:
361 band = '5';
362 break;
363 case NL80211_BAND_6GHZ:
364 band = '6';
365 break;
366 default:
367 return target_power;
368 }
369
370 snprintf(name, sizeof(name), "txpower-%cg", band);
371 np = of_get_child_by_name(np, name);
372 if (!np)
373 return target_power;
374
375 np = mt76_find_channel_node(np, chan);
376 if (!np)
377 return target_power;
378
379 txs_delta = mt76_get_txs_delta(np, hweight8(phy->antenna_mask));
380
381 val = mt76_get_of_array(np, "rates-cck", &len, ARRAY_SIZE(dest->cck));
382 mt76_apply_array_limit(dest->cck, ARRAY_SIZE(dest->cck), val,
383 target_power, txs_delta, &max_power);
384
385 val = mt76_get_of_array(np, "rates-ofdm",
386 &len, ARRAY_SIZE(dest->ofdm));
387 mt76_apply_array_limit(dest->ofdm, ARRAY_SIZE(dest->ofdm), val,
388 target_power, txs_delta, &max_power);
389
390 val = mt76_get_of_array(np, "rates-mcs", &len, mcs_rates + 1);
391 mt76_apply_multi_array_limit(dest->mcs[0], ARRAY_SIZE(dest->mcs[0]),
392 ARRAY_SIZE(dest->mcs), val, len,
393 target_power, txs_delta, &max_power);
394
395 val = mt76_get_of_array(np, "rates-ru", &len, ru_rates + 1);
396 mt76_apply_multi_array_limit(dest->ru[0], ARRAY_SIZE(dest->ru[0]),
397 ARRAY_SIZE(dest->ru), val, len,
398 target_power, txs_delta, &max_power);
399
400 return max_power;
401 }
402 EXPORT_SYMBOL_GPL(mt76_get_rate_power_limits);
403
404 int
mt76_eeprom_init(struct mt76_dev * dev,int len)405 mt76_eeprom_init(struct mt76_dev *dev, int len)
406 {
407 dev->eeprom.size = len;
408 dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
409 if (!dev->eeprom.data)
410 return -ENOMEM;
411
412 return !mt76_get_of_eeprom(dev, dev->eeprom.data, 0, len);
413 }
414 EXPORT_SYMBOL_GPL(mt76_eeprom_init);
415