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2
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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
12int 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 char *part;
19 phandle phandle;
20 int size;
21 size_t retlen;
22 int ret;
23
24 if (!np)
25 return -ENOENT;
26
27 list = of_get_property(np, "mediatek,mtd-eeprom", &size);
28 if (!list)
29 return -ENOENT;
30
31 phandle = be32_to_cpup(list++);
32 if (!phandle)
33 return -ENOENT;
34
35 np = of_find_node_by_phandle(phandle);
36 if (!np)
37 return -EINVAL;
38
39 part = of_get_property(np, "label", NULL);
40 if (!part)
41 part = np->name;
42
43 mtd = get_mtd_device_nm(part);
44 if (IS_ERR(mtd)) {
45 ret = PTR_ERR(mtd);
46 goto out_put_node;
47 }
48
49 if (size <= sizeof(*list)) {
50 ret = -EINVAL;
51 goto out_put_node;
52 }
53
54 offset = be32_to_cpup(list);
55 ret = mtd_read(mtd, offset, len, &retlen, eep);
56 put_mtd_device(mtd);
57 if (ret)
58 goto out_put_node;
59
60 if (retlen < len) {
61 ret = -EINVAL;
62 goto out_put_node;
63 }
64
65 if (of_property_read_bool(dev->dev->of_node, "big-endian")) {
66 u8 *data = (u8 *)eep;
67 int i;
68
69
70 for (i = 0; i < round_down(len, 2); i += 2)
71 put_unaligned_le16(get_unaligned_be16(&data[i]),
72 &data[i]);
73 }
74
75#ifdef CONFIG_NL80211_TESTMODE
76 dev->test_mtd.name = devm_kstrdup(dev->dev, part, GFP_KERNEL);
77 dev->test_mtd.offset = offset;
78#endif
79
80out_put_node:
81 of_node_put(np);
82 return ret;
83#else
84 return -ENOENT;
85#endif
86}
87EXPORT_SYMBOL_GPL(mt76_get_of_eeprom);
88
89void
90mt76_eeprom_override(struct mt76_phy *phy)
91{
92 struct mt76_dev *dev = phy->dev;
93 struct device_node *np = dev->dev->of_node;
94
95 of_get_mac_address(np, phy->macaddr);
96
97 if (!is_valid_ether_addr(phy->macaddr)) {
98 eth_random_addr(phy->macaddr);
99 dev_info(dev->dev,
100 "Invalid MAC address, using random address %pM\n",
101 phy->macaddr);
102 }
103}
104EXPORT_SYMBOL_GPL(mt76_eeprom_override);
105
106static bool mt76_string_prop_find(struct property *prop, const char *str)
107{
108 const char *cp = NULL;
109
110 if (!prop || !str || !str[0])
111 return false;
112
113 while ((cp = of_prop_next_string(prop, cp)) != NULL)
114 if (!strcasecmp(cp, str))
115 return true;
116
117 return false;
118}
119
120static struct device_node *
121mt76_find_power_limits_node(struct mt76_dev *dev)
122{
123 struct device_node *np = dev->dev->of_node;
124 const char *const region_names[] = {
125 [NL80211_DFS_ETSI] = "etsi",
126 [NL80211_DFS_FCC] = "fcc",
127 [NL80211_DFS_JP] = "jp",
128 };
129 struct device_node *cur, *fallback = NULL;
130 const char *region_name = NULL;
131
132 if (dev->region < ARRAY_SIZE(region_names))
133 region_name = region_names[dev->region];
134
135 np = of_get_child_by_name(np, "power-limits");
136 if (!np)
137 return NULL;
138
139 for_each_child_of_node(np, cur) {
140 struct property *country = of_find_property(cur, "country", NULL);
141 struct property *regd = of_find_property(cur, "regdomain", NULL);
142
143 if (!country && !regd) {
144 fallback = cur;
145 continue;
146 }
147
148 if (mt76_string_prop_find(country, dev->alpha2) ||
149 mt76_string_prop_find(regd, region_name))
150 return cur;
151 }
152
153 return fallback;
154}
155
156static const __be32 *
157mt76_get_of_array(struct device_node *np, char *name, size_t *len, int min)
158{
159 struct property *prop = of_find_property(np, name, NULL);
160
161 if (!prop || !prop->value || prop->length < min * 4)
162 return NULL;
163
164 *len = prop->length;
165
166 return prop->value;
167}
168
169static struct device_node *
170mt76_find_channel_node(struct device_node *np, struct ieee80211_channel *chan)
171{
172 struct device_node *cur;
173 const __be32 *val;
174 size_t len;
175
176 for_each_child_of_node(np, cur) {
177 val = mt76_get_of_array(cur, "channels", &len, 2);
178 if (!val)
179 continue;
180
181 while (len >= 2 * sizeof(*val)) {
182 if (chan->hw_value >= be32_to_cpu(val[0]) &&
183 chan->hw_value <= be32_to_cpu(val[1]))
184 return cur;
185
186 val += 2;
187 len -= 2 * sizeof(*val);
188 }
189 }
190
191 return NULL;
192}
193
194static s8
195mt76_get_txs_delta(struct device_node *np, u8 nss)
196{
197 const __be32 *val;
198 size_t len;
199
200 val = mt76_get_of_array(np, "txs-delta", &len, nss);
201 if (!val)
202 return 0;
203
204 return be32_to_cpu(val[nss - 1]);
205}
206
207static void
208mt76_apply_array_limit(s8 *pwr, size_t pwr_len, const __be32 *data,
209 s8 target_power, s8 nss_delta, s8 *max_power)
210{
211 int i;
212
213 if (!data)
214 return;
215
216 for (i = 0; i < pwr_len; i++) {
217 pwr[i] = min_t(s8, target_power,
218 be32_to_cpu(data[i]) + nss_delta);
219 *max_power = max(*max_power, pwr[i]);
220 }
221}
222
223static void
224mt76_apply_multi_array_limit(s8 *pwr, size_t pwr_len, s8 pwr_num,
225 const __be32 *data, size_t len, s8 target_power,
226 s8 nss_delta, s8 *max_power)
227{
228 int i, cur;
229
230 if (!data)
231 return;
232
233 len /= 4;
234 cur = be32_to_cpu(data[0]);
235 for (i = 0; i < pwr_num; i++) {
236 if (len < pwr_len + 1)
237 break;
238
239 mt76_apply_array_limit(pwr + pwr_len * i, pwr_len, data + 1,
240 target_power, nss_delta, max_power);
241 if (--cur > 0)
242 continue;
243
244 data += pwr_len + 1;
245 len -= pwr_len + 1;
246 if (!len)
247 break;
248
249 cur = be32_to_cpu(data[0]);
250 }
251}
252
253s8 mt76_get_rate_power_limits(struct mt76_phy *phy,
254 struct ieee80211_channel *chan,
255 struct mt76_power_limits *dest,
256 s8 target_power)
257{
258 struct mt76_dev *dev = phy->dev;
259 struct device_node *np;
260 const __be32 *val;
261 char name[16];
262 u32 mcs_rates = dev->drv->mcs_rates;
263 u32 ru_rates = ARRAY_SIZE(dest->ru[0]);
264 char band;
265 size_t len;
266 s8 max_power = 0;
267 s8 txs_delta;
268
269 if (!mcs_rates)
270 mcs_rates = 10;
271
272 memset(dest, target_power, sizeof(*dest));
273
274 if (!IS_ENABLED(CONFIG_OF))
275 return target_power;
276
277 np = mt76_find_power_limits_node(dev);
278 if (!np)
279 return target_power;
280
281 switch (chan->band) {
282 case NL80211_BAND_2GHZ:
283 band = '2';
284 break;
285 case NL80211_BAND_5GHZ:
286 band = '5';
287 break;
288 default:
289 return target_power;
290 }
291
292 snprintf(name, sizeof(name), "txpower-%cg", band);
293 np = of_get_child_by_name(np, name);
294 if (!np)
295 return target_power;
296
297 np = mt76_find_channel_node(np, chan);
298 if (!np)
299 return target_power;
300
301 txs_delta = mt76_get_txs_delta(np, hweight8(phy->antenna_mask));
302
303 val = mt76_get_of_array(np, "rates-cck", &len, ARRAY_SIZE(dest->cck));
304 mt76_apply_array_limit(dest->cck, ARRAY_SIZE(dest->cck), val,
305 target_power, txs_delta, &max_power);
306
307 val = mt76_get_of_array(np, "rates-ofdm",
308 &len, ARRAY_SIZE(dest->ofdm));
309 mt76_apply_array_limit(dest->ofdm, ARRAY_SIZE(dest->ofdm), val,
310 target_power, txs_delta, &max_power);
311
312 val = mt76_get_of_array(np, "rates-mcs", &len, mcs_rates + 1);
313 mt76_apply_multi_array_limit(dest->mcs[0], ARRAY_SIZE(dest->mcs[0]),
314 ARRAY_SIZE(dest->mcs), val, len,
315 target_power, txs_delta, &max_power);
316
317 val = mt76_get_of_array(np, "rates-ru", &len, ru_rates + 1);
318 mt76_apply_multi_array_limit(dest->ru[0], ARRAY_SIZE(dest->ru[0]),
319 ARRAY_SIZE(dest->ru), val, len,
320 target_power, txs_delta, &max_power);
321
322 return max_power;
323}
324EXPORT_SYMBOL_GPL(mt76_get_rate_power_limits);
325
326int
327mt76_eeprom_init(struct mt76_dev *dev, int len)
328{
329 dev->eeprom.size = len;
330 dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
331 if (!dev->eeprom.data)
332 return -ENOMEM;
333
334 return !mt76_get_of_eeprom(dev, dev->eeprom.data, 0, len);
335}
336EXPORT_SYMBOL_GPL(mt76_eeprom_init);
337
