xref: /linux/drivers/net/wireless/ath/carl9170/fw.c (revision f2ee442115c9b6219083c019939a9cc0c9abb2f8)
1 /*
2  * Atheros CARL9170 driver
3  *
4  * firmware parser
5  *
6  * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; see the file COPYING.  If not, see
20  * http://www.gnu.org/licenses/.
21  */
22 
23 #include <linux/kernel.h>
24 #include <linux/firmware.h>
25 #include <linux/crc32.h>
26 #include <linux/module.h>
27 #include "carl9170.h"
28 #include "fwcmd.h"
29 #include "version.h"
30 
31 #define MAKE_STR(symbol) #symbol
32 #define TO_STR(symbol) MAKE_STR(symbol)
33 #define CARL9170FW_API_VER_STR TO_STR(CARL9170FW_API_MAX_VER)
34 MODULE_VERSION(CARL9170FW_API_VER_STR ":" CARL9170FW_VERSION_GIT);
35 
36 static const u8 otus_magic[4] = { OTUS_MAGIC };
37 
38 static const void *carl9170_fw_find_desc(struct ar9170 *ar, const u8 descid[4],
39 	const unsigned int len, const u8 compatible_revision)
40 {
41 	const struct carl9170fw_desc_head *iter;
42 
43 	carl9170fw_for_each_hdr(iter, ar->fw.desc) {
44 		if (carl9170fw_desc_cmp(iter, descid, len,
45 					compatible_revision))
46 			return (void *)iter;
47 	}
48 
49 	/* needed to find the LAST desc */
50 	if (carl9170fw_desc_cmp(iter, descid, len,
51 				compatible_revision))
52 		return (void *)iter;
53 
54 	return NULL;
55 }
56 
57 static int carl9170_fw_verify_descs(struct ar9170 *ar,
58 	const struct carl9170fw_desc_head *head, unsigned int max_len)
59 {
60 	const struct carl9170fw_desc_head *pos;
61 	unsigned long pos_addr, end_addr;
62 	unsigned int pos_length;
63 
64 	if (max_len < sizeof(*pos))
65 		return -ENODATA;
66 
67 	max_len = min_t(unsigned int, CARL9170FW_DESC_MAX_LENGTH, max_len);
68 
69 	pos = head;
70 	pos_addr = (unsigned long) pos;
71 	end_addr = pos_addr + max_len;
72 
73 	while (pos_addr < end_addr) {
74 		if (pos_addr + sizeof(*head) > end_addr)
75 			return -E2BIG;
76 
77 		pos_length = le16_to_cpu(pos->length);
78 
79 		if (pos_length < sizeof(*head))
80 			return -EBADMSG;
81 
82 		if (pos_length > max_len)
83 			return -EOVERFLOW;
84 
85 		if (pos_addr + pos_length > end_addr)
86 			return -EMSGSIZE;
87 
88 		if (carl9170fw_desc_cmp(pos, LAST_MAGIC,
89 					CARL9170FW_LAST_DESC_SIZE,
90 					CARL9170FW_LAST_DESC_CUR_VER))
91 			return 0;
92 
93 		pos_addr += pos_length;
94 		pos = (void *)pos_addr;
95 		max_len -= pos_length;
96 	}
97 	return -EINVAL;
98 }
99 
100 static void carl9170_fw_info(struct ar9170 *ar)
101 {
102 	const struct carl9170fw_motd_desc *motd_desc;
103 	unsigned int str_ver_len;
104 	u32 fw_date;
105 
106 	dev_info(&ar->udev->dev, "driver   API: %s 2%03d-%02d-%02d [%d-%d]\n",
107 		CARL9170FW_VERSION_GIT, CARL9170FW_VERSION_YEAR,
108 		CARL9170FW_VERSION_MONTH, CARL9170FW_VERSION_DAY,
109 		CARL9170FW_API_MIN_VER, CARL9170FW_API_MAX_VER);
110 
111 	motd_desc = carl9170_fw_find_desc(ar, MOTD_MAGIC,
112 		sizeof(*motd_desc), CARL9170FW_MOTD_DESC_CUR_VER);
113 
114 	if (motd_desc) {
115 		str_ver_len = strnlen(motd_desc->release,
116 			CARL9170FW_MOTD_RELEASE_LEN);
117 
118 		fw_date = le32_to_cpu(motd_desc->fw_year_month_day);
119 
120 		dev_info(&ar->udev->dev, "firmware API: %.*s 2%03d-%02d-%02d\n",
121 			 str_ver_len, motd_desc->release,
122 			 CARL9170FW_GET_YEAR(fw_date),
123 			 CARL9170FW_GET_MONTH(fw_date),
124 			 CARL9170FW_GET_DAY(fw_date));
125 
126 		strlcpy(ar->hw->wiphy->fw_version, motd_desc->release,
127 			sizeof(ar->hw->wiphy->fw_version));
128 	}
129 }
130 
131 static bool valid_dma_addr(const u32 address)
132 {
133 	if (address >= AR9170_SRAM_OFFSET &&
134 	    address < (AR9170_SRAM_OFFSET + AR9170_SRAM_SIZE))
135 		return true;
136 
137 	return false;
138 }
139 
140 static bool valid_cpu_addr(const u32 address)
141 {
142 	if (valid_dma_addr(address) || (address >= AR9170_PRAM_OFFSET &&
143 	    address < (AR9170_PRAM_OFFSET + AR9170_PRAM_SIZE)))
144 		return true;
145 
146 	return false;
147 }
148 
149 static int carl9170_fw(struct ar9170 *ar, const __u8 *data, size_t len)
150 {
151 	const struct carl9170fw_otus_desc *otus_desc;
152 	const struct carl9170fw_chk_desc *chk_desc;
153 	const struct carl9170fw_last_desc *last_desc;
154 	const struct carl9170fw_txsq_desc *txsq_desc;
155 	u16 if_comb_types;
156 
157 	last_desc = carl9170_fw_find_desc(ar, LAST_MAGIC,
158 		sizeof(*last_desc), CARL9170FW_LAST_DESC_CUR_VER);
159 	if (!last_desc)
160 		return -EINVAL;
161 
162 	otus_desc = carl9170_fw_find_desc(ar, OTUS_MAGIC,
163 		sizeof(*otus_desc), CARL9170FW_OTUS_DESC_CUR_VER);
164 	if (!otus_desc) {
165 		dev_err(&ar->udev->dev, "failed to find compatible firmware "
166 			"descriptor.\n");
167 		return -ENODATA;
168 	}
169 
170 	chk_desc = carl9170_fw_find_desc(ar, CHK_MAGIC,
171 		sizeof(*chk_desc), CARL9170FW_CHK_DESC_CUR_VER);
172 
173 	if (chk_desc) {
174 		unsigned long fin, diff;
175 		unsigned int dsc_len;
176 		u32 crc32;
177 
178 		dsc_len = min_t(unsigned int, len,
179 			(unsigned long)chk_desc - (unsigned long)otus_desc);
180 
181 		fin = (unsigned long) last_desc + sizeof(*last_desc);
182 		diff = fin - (unsigned long) otus_desc;
183 
184 		if (diff < len)
185 			len -= diff;
186 
187 		if (len < 256)
188 			return -EIO;
189 
190 		crc32 = crc32_le(~0, data, len);
191 		if (cpu_to_le32(crc32) != chk_desc->fw_crc32) {
192 			dev_err(&ar->udev->dev, "fw checksum test failed.\n");
193 			return -ENOEXEC;
194 		}
195 
196 		crc32 = crc32_le(crc32, (void *)otus_desc, dsc_len);
197 		if (cpu_to_le32(crc32) != chk_desc->hdr_crc32) {
198 			dev_err(&ar->udev->dev, "descriptor check failed.\n");
199 			return -EINVAL;
200 		}
201 	} else {
202 		dev_warn(&ar->udev->dev, "Unprotected firmware image.\n");
203 	}
204 
205 #define SUPP(feat)						\
206 	(carl9170fw_supports(otus_desc->feature_set, feat))
207 
208 	if (!SUPP(CARL9170FW_DUMMY_FEATURE)) {
209 		dev_err(&ar->udev->dev, "invalid firmware descriptor "
210 			"format detected.\n");
211 		return -EINVAL;
212 	}
213 
214 	ar->fw.api_version = otus_desc->api_ver;
215 
216 	if (ar->fw.api_version < CARL9170FW_API_MIN_VER ||
217 	    ar->fw.api_version > CARL9170FW_API_MAX_VER) {
218 		dev_err(&ar->udev->dev, "unsupported firmware api version.\n");
219 		return -EINVAL;
220 	}
221 
222 	if (!SUPP(CARL9170FW_COMMAND_PHY) || SUPP(CARL9170FW_UNUSABLE) ||
223 	    !SUPP(CARL9170FW_HANDLE_BACK_REQ)) {
224 		dev_err(&ar->udev->dev, "firmware does support "
225 			"mandatory features.\n");
226 		return -ECANCELED;
227 	}
228 
229 	if (ilog2(le32_to_cpu(otus_desc->feature_set)) >=
230 		__CARL9170FW_FEATURE_NUM) {
231 		dev_warn(&ar->udev->dev, "driver does not support all "
232 			 "firmware features.\n");
233 	}
234 
235 	if (!SUPP(CARL9170FW_COMMAND_CAM)) {
236 		dev_info(&ar->udev->dev, "crypto offloading is disabled "
237 			 "by firmware.\n");
238 		ar->disable_offload = true;
239 	}
240 
241 	if (SUPP(CARL9170FW_PSM) && SUPP(CARL9170FW_FIXED_5GHZ_PSM))
242 		ar->hw->flags |= IEEE80211_HW_SUPPORTS_PS;
243 
244 	if (!SUPP(CARL9170FW_USB_INIT_FIRMWARE)) {
245 		dev_err(&ar->udev->dev, "firmware does not provide "
246 			"mandatory interfaces.\n");
247 		return -EINVAL;
248 	}
249 
250 	if (SUPP(CARL9170FW_MINIBOOT))
251 		ar->fw.offset = le16_to_cpu(otus_desc->miniboot_size);
252 	else
253 		ar->fw.offset = 0;
254 
255 	if (SUPP(CARL9170FW_USB_DOWN_STREAM)) {
256 		ar->hw->extra_tx_headroom += sizeof(struct ar9170_stream);
257 		ar->fw.tx_stream = true;
258 	}
259 
260 	if (SUPP(CARL9170FW_USB_UP_STREAM))
261 		ar->fw.rx_stream = true;
262 
263 	if (SUPP(CARL9170FW_RX_FILTER)) {
264 		ar->fw.rx_filter = true;
265 		ar->rx_filter_caps = FIF_FCSFAIL | FIF_PLCPFAIL |
266 			FIF_CONTROL | FIF_PSPOLL | FIF_OTHER_BSS |
267 			FIF_PROMISC_IN_BSS;
268 	}
269 
270 	if (SUPP(CARL9170FW_HW_COUNTERS))
271 		ar->fw.hw_counters = true;
272 
273 	if (SUPP(CARL9170FW_WOL))
274 		device_set_wakeup_enable(&ar->udev->dev, true);
275 
276 	if_comb_types = BIT(NL80211_IFTYPE_STATION) |
277 			BIT(NL80211_IFTYPE_P2P_CLIENT);
278 
279 	ar->fw.vif_num = otus_desc->vif_num;
280 	ar->fw.cmd_bufs = otus_desc->cmd_bufs;
281 	ar->fw.address = le32_to_cpu(otus_desc->fw_address);
282 	ar->fw.rx_size = le16_to_cpu(otus_desc->rx_max_frame_len);
283 	ar->fw.mem_blocks = min_t(unsigned int, otus_desc->tx_descs, 0xfe);
284 	atomic_set(&ar->mem_free_blocks, ar->fw.mem_blocks);
285 	ar->fw.mem_block_size = le16_to_cpu(otus_desc->tx_frag_len);
286 
287 	if (ar->fw.vif_num >= AR9170_MAX_VIRTUAL_MAC || !ar->fw.vif_num ||
288 	    ar->fw.mem_blocks < 16 || !ar->fw.cmd_bufs ||
289 	    ar->fw.mem_block_size < 64 || ar->fw.mem_block_size > 512 ||
290 	    ar->fw.rx_size > 32768 || ar->fw.rx_size < 4096 ||
291 	    !valid_cpu_addr(ar->fw.address)) {
292 		dev_err(&ar->udev->dev, "firmware shows obvious signs of "
293 			"malicious tampering.\n");
294 		return -EINVAL;
295 	}
296 
297 	ar->fw.beacon_addr = le32_to_cpu(otus_desc->bcn_addr);
298 	ar->fw.beacon_max_len = le16_to_cpu(otus_desc->bcn_len);
299 
300 	if (valid_dma_addr(ar->fw.beacon_addr) && ar->fw.beacon_max_len >=
301 	    AR9170_MAC_BCN_LENGTH_MAX) {
302 		ar->hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_ADHOC);
303 
304 		if (SUPP(CARL9170FW_WLANTX_CAB)) {
305 			if_comb_types |=
306 				BIT(NL80211_IFTYPE_AP) |
307 				BIT(NL80211_IFTYPE_P2P_GO);
308 		}
309 	}
310 
311 	ar->if_comb_limits[0].max = ar->fw.vif_num;
312 	ar->if_comb_limits[0].types = if_comb_types;
313 
314 	ar->if_combs[0].num_different_channels = 1;
315 	ar->if_combs[0].max_interfaces = ar->fw.vif_num;
316 	ar->if_combs[0].limits = ar->if_comb_limits;
317 	ar->if_combs[0].n_limits = ARRAY_SIZE(ar->if_comb_limits);
318 
319 	ar->hw->wiphy->iface_combinations = ar->if_combs;
320 	ar->hw->wiphy->n_iface_combinations = ARRAY_SIZE(ar->if_combs);
321 
322 	ar->hw->wiphy->interface_modes |= if_comb_types;
323 
324 	txsq_desc = carl9170_fw_find_desc(ar, TXSQ_MAGIC,
325 		sizeof(*txsq_desc), CARL9170FW_TXSQ_DESC_CUR_VER);
326 
327 	if (txsq_desc) {
328 		ar->fw.tx_seq_table = le32_to_cpu(txsq_desc->seq_table_addr);
329 		if (!valid_cpu_addr(ar->fw.tx_seq_table))
330 			return -EINVAL;
331 	} else {
332 		ar->fw.tx_seq_table = 0;
333 	}
334 
335 #undef SUPPORTED
336 	return 0;
337 }
338 
339 static struct carl9170fw_desc_head *
340 carl9170_find_fw_desc(struct ar9170 *ar, const __u8 *fw_data, const size_t len)
341 
342 {
343 	int scan = 0, found = 0;
344 
345 	if (!carl9170fw_size_check(len)) {
346 		dev_err(&ar->udev->dev, "firmware size is out of bound.\n");
347 		return NULL;
348 	}
349 
350 	while (scan < len - sizeof(struct carl9170fw_desc_head)) {
351 		if (fw_data[scan++] == otus_magic[found])
352 			found++;
353 		else
354 			found = 0;
355 
356 		if (scan >= len)
357 			break;
358 
359 		if (found == sizeof(otus_magic))
360 			break;
361 	}
362 
363 	if (found != sizeof(otus_magic))
364 		return NULL;
365 
366 	return (void *)&fw_data[scan - found];
367 }
368 
369 int carl9170_fw_fix_eeprom(struct ar9170 *ar)
370 {
371 	const struct carl9170fw_fix_desc *fix_desc = NULL;
372 	unsigned int i, n, off;
373 	u32 *data = (void *)&ar->eeprom;
374 
375 	fix_desc = carl9170_fw_find_desc(ar, FIX_MAGIC,
376 		sizeof(*fix_desc), CARL9170FW_FIX_DESC_CUR_VER);
377 
378 	if (!fix_desc)
379 		return 0;
380 
381 	n = (le16_to_cpu(fix_desc->head.length) - sizeof(*fix_desc)) /
382 	    sizeof(struct carl9170fw_fix_entry);
383 
384 	for (i = 0; i < n; i++) {
385 		off = le32_to_cpu(fix_desc->data[i].address) -
386 		      AR9170_EEPROM_START;
387 
388 		if (off >= sizeof(struct ar9170_eeprom) || (off & 3)) {
389 			dev_err(&ar->udev->dev, "Skip invalid entry %d\n", i);
390 			continue;
391 		}
392 
393 		data[off / sizeof(*data)] &=
394 			le32_to_cpu(fix_desc->data[i].mask);
395 		data[off / sizeof(*data)] |=
396 			le32_to_cpu(fix_desc->data[i].value);
397 	}
398 
399 	return 0;
400 }
401 
402 int carl9170_parse_firmware(struct ar9170 *ar)
403 {
404 	const struct carl9170fw_desc_head *fw_desc = NULL;
405 	const struct firmware *fw = ar->fw.fw;
406 	unsigned long header_offset = 0;
407 	int err;
408 
409 	if (WARN_ON(!fw))
410 		return -EINVAL;
411 
412 	fw_desc = carl9170_find_fw_desc(ar, fw->data, fw->size);
413 
414 	if (!fw_desc) {
415 		dev_err(&ar->udev->dev, "unsupported firmware.\n");
416 		return -ENODATA;
417 	}
418 
419 	header_offset = (unsigned long)fw_desc - (unsigned long)fw->data;
420 
421 	err = carl9170_fw_verify_descs(ar, fw_desc, fw->size - header_offset);
422 	if (err) {
423 		dev_err(&ar->udev->dev, "damaged firmware (%d).\n", err);
424 		return err;
425 	}
426 
427 	ar->fw.desc = fw_desc;
428 
429 	carl9170_fw_info(ar);
430 
431 	err = carl9170_fw(ar, fw->data, fw->size);
432 	if (err) {
433 		dev_err(&ar->udev->dev, "failed to parse firmware (%d).\n",
434 			err);
435 		return err;
436 	}
437 
438 	return 0;
439 }
440