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 (mtd_is_bitflip(ret))
69 ret = 0;
70 if (ret) {
71 dev_err(dev->dev, "reading EEPROM from mtd %s failed: %i\n",
72 part, ret);
73 goto out_put_node;
74 }
75
76 if (retlen < len) {
77 ret = -EINVAL;
78 goto out_put_node;
79 }
80
81 if (of_property_read_bool(dev->dev->of_node, "big-endian")) {
82 u8 *data = (u8 *)eep;
83 int i;
84
85 /* convert eeprom data in Little Endian */
86 for (i = 0; i < round_down(len, 2); i += 2)
87 put_unaligned_le16(get_unaligned_be16(&data[i]),
88 &data[i]);
89 }
90
91 #ifdef CONFIG_NL80211_TESTMODE
92 dev->test_mtd.name = devm_kstrdup(dev->dev, part, GFP_KERNEL);
93 dev->test_mtd.offset = offset;
94 #endif
95
96 out_put_node:
97 of_node_put(np);
98 return ret;
99 #else
100 return -ENOENT;
101 #endif
102 }
103 EXPORT_SYMBOL_GPL(mt76_get_of_eeprom);
104
105 void
mt76_eeprom_override(struct mt76_phy * phy)106 mt76_eeprom_override(struct mt76_phy *phy)
107 {
108 struct mt76_dev *dev = phy->dev;
109 struct device_node *np = dev->dev->of_node;
110
111 of_get_mac_address(np, phy->macaddr);
112
113 if (!is_valid_ether_addr(phy->macaddr)) {
114 eth_random_addr(phy->macaddr);
115 dev_info(dev->dev,
116 "Invalid MAC address, using random address %pM\n",
117 phy->macaddr);
118 }
119 }
120 EXPORT_SYMBOL_GPL(mt76_eeprom_override);
121
mt76_string_prop_find(struct property * prop,const char * str)122 static bool mt76_string_prop_find(struct property *prop, const char *str)
123 {
124 const char *cp = NULL;
125
126 if (!prop || !str || !str[0])
127 return false;
128
129 while ((cp = of_prop_next_string(prop, cp)) != NULL)
130 if (!strcasecmp(cp, str))
131 return true;
132
133 return false;
134 }
135
136 static struct device_node *
mt76_find_power_limits_node(struct mt76_dev * dev)137 mt76_find_power_limits_node(struct mt76_dev *dev)
138 {
139 struct device_node *np = dev->dev->of_node;
140 const char *const region_names[] = {
141 [NL80211_DFS_ETSI] = "etsi",
142 [NL80211_DFS_FCC] = "fcc",
143 [NL80211_DFS_JP] = "jp",
144 };
145 struct device_node *cur, *fallback = NULL;
146 const char *region_name = NULL;
147
148 if (dev->region < ARRAY_SIZE(region_names))
149 region_name = region_names[dev->region];
150
151 np = of_get_child_by_name(np, "power-limits");
152 if (!np)
153 return NULL;
154
155 for_each_child_of_node(np, cur) {
156 struct property *country = of_find_property(cur, "country", NULL);
157 struct property *regd = of_find_property(cur, "regdomain", NULL);
158
159 if (!country && !regd) {
160 fallback = cur;
161 continue;
162 }
163
164 if (mt76_string_prop_find(country, dev->alpha2) ||
165 mt76_string_prop_find(regd, region_name)) {
166 of_node_put(np);
167 return cur;
168 }
169 }
170
171 of_node_put(np);
172 return fallback;
173 }
174
175 static const __be32 *
mt76_get_of_array(struct device_node * np,char * name,size_t * len,int min)176 mt76_get_of_array(struct device_node *np, char *name, size_t *len, int min)
177 {
178 struct property *prop = of_find_property(np, name, NULL);
179
180 if (!prop || !prop->value || prop->length < min * 4)
181 return NULL;
182
183 *len = prop->length;
184
185 return prop->value;
186 }
187
188 static struct device_node *
mt76_find_channel_node(struct device_node * np,struct ieee80211_channel * chan)189 mt76_find_channel_node(struct device_node *np, struct ieee80211_channel *chan)
190 {
191 struct device_node *cur;
192 const __be32 *val;
193 size_t len;
194
195 for_each_child_of_node(np, cur) {
196 val = mt76_get_of_array(cur, "channels", &len, 2);
197 if (!val)
198 continue;
199
200 while (len >= 2 * sizeof(*val)) {
201 if (chan->hw_value >= be32_to_cpu(val[0]) &&
202 chan->hw_value <= be32_to_cpu(val[1]))
203 return cur;
204
205 val += 2;
206 len -= 2 * sizeof(*val);
207 }
208 }
209
210 return NULL;
211 }
212
213 static s8
mt76_get_txs_delta(struct device_node * np,u8 nss)214 mt76_get_txs_delta(struct device_node *np, u8 nss)
215 {
216 const __be32 *val;
217 size_t len;
218
219 val = mt76_get_of_array(np, "txs-delta", &len, nss);
220 if (!val)
221 return 0;
222
223 return be32_to_cpu(val[nss - 1]);
224 }
225
226 static void
mt76_apply_array_limit(s8 * pwr,size_t pwr_len,const __be32 * data,s8 target_power,s8 nss_delta,s8 * max_power)227 mt76_apply_array_limit(s8 *pwr, size_t pwr_len, const __be32 *data,
228 s8 target_power, s8 nss_delta, s8 *max_power)
229 {
230 int i;
231
232 if (!data)
233 return;
234
235 for (i = 0; i < pwr_len; i++) {
236 pwr[i] = min_t(s8, target_power,
237 be32_to_cpu(data[i]) + nss_delta);
238 *max_power = max(*max_power, pwr[i]);
239 }
240 }
241
242 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)243 mt76_apply_multi_array_limit(s8 *pwr, size_t pwr_len, s8 pwr_num,
244 const __be32 *data, size_t len, s8 target_power,
245 s8 nss_delta, s8 *max_power)
246 {
247 int i, cur;
248
249 if (!data)
250 return;
251
252 len /= 4;
253 cur = be32_to_cpu(data[0]);
254 for (i = 0; i < pwr_num; i++) {
255 if (len < pwr_len + 1)
256 break;
257
258 mt76_apply_array_limit(pwr + pwr_len * i, pwr_len, data + 1,
259 target_power, nss_delta, max_power);
260 if (--cur > 0)
261 continue;
262
263 data += pwr_len + 1;
264 len -= pwr_len + 1;
265 if (!len)
266 break;
267
268 cur = be32_to_cpu(data[0]);
269 }
270 }
271
mt76_get_rate_power_limits(struct mt76_phy * phy,struct ieee80211_channel * chan,struct mt76_power_limits * dest,s8 target_power)272 s8 mt76_get_rate_power_limits(struct mt76_phy *phy,
273 struct ieee80211_channel *chan,
274 struct mt76_power_limits *dest,
275 s8 target_power)
276 {
277 struct mt76_dev *dev = phy->dev;
278 struct device_node *np;
279 const __be32 *val;
280 char name[16];
281 u32 mcs_rates = dev->drv->mcs_rates;
282 u32 ru_rates = ARRAY_SIZE(dest->ru[0]);
283 char band;
284 size_t len;
285 s8 max_power = 0;
286 s8 txs_delta;
287
288 if (!mcs_rates)
289 mcs_rates = 10;
290
291 memset(dest, target_power, sizeof(*dest));
292
293 if (!IS_ENABLED(CONFIG_OF))
294 return target_power;
295
296 np = mt76_find_power_limits_node(dev);
297 if (!np)
298 return target_power;
299
300 switch (chan->band) {
301 case NL80211_BAND_2GHZ:
302 band = '2';
303 break;
304 case NL80211_BAND_5GHZ:
305 band = '5';
306 break;
307 case NL80211_BAND_6GHZ:
308 band = '6';
309 break;
310 default:
311 return target_power;
312 }
313
314 snprintf(name, sizeof(name), "txpower-%cg", band);
315 np = of_get_child_by_name(np, name);
316 if (!np)
317 return target_power;
318
319 np = mt76_find_channel_node(np, chan);
320 if (!np)
321 return target_power;
322
323 txs_delta = mt76_get_txs_delta(np, hweight8(phy->antenna_mask));
324
325 val = mt76_get_of_array(np, "rates-cck", &len, ARRAY_SIZE(dest->cck));
326 mt76_apply_array_limit(dest->cck, ARRAY_SIZE(dest->cck), val,
327 target_power, txs_delta, &max_power);
328
329 val = mt76_get_of_array(np, "rates-ofdm",
330 &len, ARRAY_SIZE(dest->ofdm));
331 mt76_apply_array_limit(dest->ofdm, ARRAY_SIZE(dest->ofdm), val,
332 target_power, txs_delta, &max_power);
333
334 val = mt76_get_of_array(np, "rates-mcs", &len, mcs_rates + 1);
335 mt76_apply_multi_array_limit(dest->mcs[0], ARRAY_SIZE(dest->mcs[0]),
336 ARRAY_SIZE(dest->mcs), val, len,
337 target_power, txs_delta, &max_power);
338
339 val = mt76_get_of_array(np, "rates-ru", &len, ru_rates + 1);
340 mt76_apply_multi_array_limit(dest->ru[0], ARRAY_SIZE(dest->ru[0]),
341 ARRAY_SIZE(dest->ru), val, len,
342 target_power, txs_delta, &max_power);
343
344 return max_power;
345 }
346 EXPORT_SYMBOL_GPL(mt76_get_rate_power_limits);
347
348 int
mt76_eeprom_init(struct mt76_dev * dev,int len)349 mt76_eeprom_init(struct mt76_dev *dev, int len)
350 {
351 dev->eeprom.size = len;
352 dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
353 if (!dev->eeprom.data)
354 return -ENOMEM;
355
356 return !mt76_get_of_eeprom(dev, dev->eeprom.data, 0, len);
357 }
358 EXPORT_SYMBOL_GPL(mt76_eeprom_init);
359