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
mt76_get_of_eeprom(struct mt76_dev * dev,void * eep,int offset,int len)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
mt76_eeprom_override(struct mt76_phy * phy)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
mt76_string_prop_find(struct property * prop,const char * str)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 *
mt76_find_power_limits_node(struct mt76_dev * dev)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 *
mt76_get_of_array(struct device_node * np,char * name,size_t * len,int min)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 *
mt76_find_channel_node(struct device_node * np,struct ieee80211_channel * chan)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
mt76_get_txs_delta(struct device_node * np,u8 nss)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
mt76_apply_array_limit(s8 * pwr,size_t pwr_len,const __be32 * data,s8 target_power,s8 nss_delta,s8 * max_power)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
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)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
mt76_get_rate_power_limits(struct mt76_phy * phy,struct ieee80211_channel * chan,struct mt76_power_limits * dest,s8 target_power)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
mt76_eeprom_init(struct mt76_dev * dev,int len)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