summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/brcm80211/brcmfmac/bcdc.c
blob: 12c27d13df7f459426e4abf736540c1b502a68e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*******************************************************************************
 * Communicates with the dongle by using dcmd codes.
 * For certain dcmd codes, the dongle interprets string data from the host.
 ******************************************************************************/

#include <linux/types.h>
#include <linux/netdevice.h>

#include <brcmu_utils.h>
#include <brcmu_wifi.h>

#include "dhd.h"
#include "dhd_bus.h"
#include "fwsignal.h"
#include "dhd_dbg.h"
#include "tracepoint.h"
#include "proto.h"
#include "bcdc.h"

struct brcmf_proto_bcdc_dcmd {
	__le32 cmd;	/* dongle command value */
	__le32 len;	/* lower 16: output buflen;
			 * upper 16: input buflen (excludes header) */
	__le32 flags;	/* flag defns given below */
	__le32 status;	/* status code returned from the device */
};

/* Max valid buffer size that can be sent to the dongle */
#define BCDC_MAX_MSG_SIZE	(ETH_FRAME_LEN+ETH_FCS_LEN)

/* BCDC flag definitions */
#define BCDC_DCMD_ERROR		0x01		/* 1=cmd failed */
#define BCDC_DCMD_SET		0x02		/* 0=get, 1=set cmd */
#define BCDC_DCMD_IF_MASK	0xF000		/* I/F index */
#define BCDC_DCMD_IF_SHIFT	12
#define BCDC_DCMD_ID_MASK	0xFFFF0000	/* id an cmd pairing */
#define BCDC_DCMD_ID_SHIFT	16		/* ID Mask shift bits */
#define BCDC_DCMD_ID(flags)	\
	(((flags) & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT)

/*
 * BCDC header - Broadcom specific extension of CDC.
 * Used on data packets to convey priority across USB.
 */
#define	BCDC_HEADER_LEN		4
#define BCDC_PROTO_VER		2	/* Protocol version */
#define BCDC_FLAG_VER_MASK	0xf0	/* Protocol version mask */
#define BCDC_FLAG_VER_SHIFT	4	/* Protocol version shift */
#define BCDC_FLAG_SUM_GOOD	0x04	/* Good RX checksums */
#define BCDC_FLAG_SUM_NEEDED	0x08	/* Dongle needs to do TX checksums */
#define BCDC_PRIORITY_MASK	0x7
#define BCDC_FLAG2_IF_MASK	0x0f	/* packet rx interface in APSTA */
#define BCDC_FLAG2_IF_SHIFT	0

#define BCDC_GET_IF_IDX(hdr) \
	((int)((((hdr)->flags2) & BCDC_FLAG2_IF_MASK) >> BCDC_FLAG2_IF_SHIFT))
#define BCDC_SET_IF_IDX(hdr, idx) \
	((hdr)->flags2 = (((hdr)->flags2 & ~BCDC_FLAG2_IF_MASK) | \
	((idx) << BCDC_FLAG2_IF_SHIFT)))

/**
 * struct brcmf_proto_bcdc_header - BCDC header format
 *
 * @flags: flags contain protocol and checksum info.
 * @priority: 802.1d priority and USB flow control info (bit 4:7).
 * @flags2: additional flags containing dongle interface index.
 * @data_offset: start of packet data. header is following by firmware signals.
 */
struct brcmf_proto_bcdc_header {
	u8 flags;
	u8 priority;
	u8 flags2;
	u8 data_offset;
};

/*
 * maximum length of firmware signal data between
 * the BCDC header and packet data in the tx path.
 */
#define BRCMF_PROT_FW_SIGNAL_MAX_TXBYTES	12

#define RETRIES 2 /* # of retries to retrieve matching dcmd response */
#define BUS_HEADER_LEN	(16+64)		/* Must be atleast SDPCM_RESERVE
					 * (amount of header tha might be added)
					 * plus any space that might be needed
					 * for bus alignment padding.
					 */
struct brcmf_bcdc {
	u16 reqid;
	u8 bus_header[BUS_HEADER_LEN];
	struct brcmf_proto_bcdc_dcmd msg;
	unsigned char buf[BRCMF_DCMD_MAXLEN];
};


static int
brcmf_proto_bcdc_msg(struct brcmf_pub *drvr, int ifidx, uint cmd, void *buf,
		     uint len, bool set)
{
	struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
	struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
	u32 flags;

	brcmf_dbg(BCDC, "Enter\n");

	memset(msg, 0, sizeof(struct brcmf_proto_bcdc_dcmd));

	msg->cmd = cpu_to_le32(cmd);
	msg->len = cpu_to_le32(len);
	flags = (++bcdc->reqid << BCDC_DCMD_ID_SHIFT);
	if (set)
		flags |= BCDC_DCMD_SET;
	flags = (flags & ~BCDC_DCMD_IF_MASK) |
		(ifidx << BCDC_DCMD_IF_SHIFT);
	msg->flags = cpu_to_le32(flags);

	if (buf)
		memcpy(bcdc->buf, buf, len);

	/* Send request */
	return brcmf_bus_txctl(drvr->bus_if, (unsigned char *)&bcdc->msg,
			       len + sizeof(struct brcmf_proto_bcdc_dcmd));
}

static int brcmf_proto_bcdc_cmplt(struct brcmf_pub *drvr, u32 id, u32 len)
{
	int ret;
	struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;

	brcmf_dbg(BCDC, "Enter\n");
	len += sizeof(struct brcmf_proto_bcdc_dcmd);
	do {
		ret = brcmf_bus_rxctl(drvr->bus_if, (unsigned char *)&bcdc->msg,
				      len);
		if (ret < 0)
			break;
	} while (BCDC_DCMD_ID(le32_to_cpu(bcdc->msg.flags)) != id);

	return ret;
}

static int
brcmf_proto_bcdc_query_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
			    void *buf, uint len)
{
	struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
	struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
	void *info;
	int ret = 0, retries = 0;
	u32 id, flags;

	brcmf_dbg(BCDC, "Enter, cmd %d len %d\n", cmd, len);

	ret = brcmf_proto_bcdc_msg(drvr, ifidx, cmd, buf, len, false);
	if (ret < 0) {
		brcmf_err("brcmf_proto_bcdc_msg failed w/status %d\n",
			  ret);
		goto done;
	}

retry:
	/* wait for interrupt and get first fragment */
	ret = brcmf_proto_bcdc_cmplt(drvr, bcdc->reqid, len);
	if (ret < 0)
		goto done;

	flags = le32_to_cpu(msg->flags);
	id = (flags & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT;

	if ((id < bcdc->reqid) && (++retries < RETRIES))
		goto retry;
	if (id != bcdc->reqid) {
		brcmf_err("%s: unexpected request id %d (expected %d)\n",
			  brcmf_ifname(drvr, ifidx), id, bcdc->reqid);
		ret = -EINVAL;
		goto done;
	}

	/* Check info buffer */
	info = (void *)&msg[1];

	/* Copy info buffer */
	if (buf) {
		if (ret < (int)len)
			len = ret;
		memcpy(buf, info, len);
	}

	/* Check the ERROR flag */
	if (flags & BCDC_DCMD_ERROR)
		ret = le32_to_cpu(msg->status);

done:
	return ret;
}

static int
brcmf_proto_bcdc_set_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
			  void *buf, uint len)
{
	struct brcmf_bcdc *bcdc = (struct brcmf_bcdc *)drvr->proto->pd;
	struct brcmf_proto_bcdc_dcmd *msg = &bcdc->msg;
	int ret = 0;
	u32 flags, id;

	brcmf_dbg(BCDC, "Enter, cmd %d len %d\n", cmd, len);

	ret = brcmf_proto_bcdc_msg(drvr, ifidx, cmd, buf, len, true);
	if (ret < 0)
		goto done;

	ret = brcmf_proto_bcdc_cmplt(drvr, bcdc->reqid, len);
	if (ret < 0)
		goto done;

	flags = le32_to_cpu(msg->flags);
	id = (flags & BCDC_DCMD_ID_MASK) >> BCDC_DCMD_ID_SHIFT;

	if (id != bcdc->reqid) {
		brcmf_err("%s: unexpected request id %d (expected %d)\n",
			  brcmf_ifname(drvr, ifidx), id, bcdc->reqid);
		ret = -EINVAL;
		goto done;
	}

	/* Check the ERROR flag */
	if (flags & BCDC_DCMD_ERROR)
		ret = le32_to_cpu(msg->status);

done:
	return ret;
}

static void
brcmf_proto_bcdc_hdrpush(struct brcmf_pub *drvr, int ifidx, u8 offset,
			 struct sk_buff *pktbuf)
{
	struct brcmf_proto_bcdc_header *h;

	brcmf_dbg(BCDC, "Enter\n");

	/* Push BDC header used to convey priority for buses that don't */
	skb_push(pktbuf, BCDC_HEADER_LEN);

	h = (struct brcmf_proto_bcdc_header *)(pktbuf->data);

	h->flags = (BCDC_PROTO_VER << BCDC_FLAG_VER_SHIFT);
	if (pktbuf->ip_summed == CHECKSUM_PARTIAL)
		h->flags |= BCDC_FLAG_SUM_NEEDED;

	h->priority = (pktbuf->priority & BCDC_PRIORITY_MASK);
	h->flags2 = 0;
	h->data_offset = offset;
	BCDC_SET_IF_IDX(h, ifidx);
	trace_brcmf_bcdchdr(pktbuf->data);
}

static int
brcmf_proto_bcdc_hdrpull(struct brcmf_pub *drvr, bool do_fws, u8 *ifidx,
			 struct sk_buff *pktbuf)
{
	struct brcmf_proto_bcdc_header *h;

	brcmf_dbg(BCDC, "Enter\n");

	/* Pop BCDC header used to convey priority for buses that don't */
	if (pktbuf->len <= BCDC_HEADER_LEN) {
		brcmf_dbg(INFO, "rx data too short (%d <= %d)\n",
			  pktbuf->len, BCDC_HEADER_LEN);
		return -EBADE;
	}

	trace_brcmf_bcdchdr(pktbuf->data);
	h = (struct brcmf_proto_bcdc_header *)(pktbuf->data);

	*ifidx = BCDC_GET_IF_IDX(h);
	if (*ifidx >= BRCMF_MAX_IFS) {
		brcmf_err("rx data ifnum out of range (%d)\n", *ifidx);
		return -EBADE;
	}
	/* The ifidx is the idx to map to matching netdev/ifp. When receiving
	 * events this is easy because it contains the bssidx which maps
	 * 1-on-1 to the netdev/ifp. But for data frames the ifidx is rcvd.
	 * bssidx 1 is used for p2p0 and no data can be received or
	 * transmitted on it. Therefor bssidx is ifidx + 1 if ifidx > 0
	 */
	if (*ifidx)
		(*ifidx)++;

	if (((h->flags & BCDC_FLAG_VER_MASK) >> BCDC_FLAG_VER_SHIFT) !=
	    BCDC_PROTO_VER) {
		brcmf_err("%s: non-BCDC packet received, flags 0x%x\n",
			  brcmf_ifname(drvr, *ifidx), h->flags);
		return -EBADE;
	}

	if (h->flags & BCDC_FLAG_SUM_GOOD) {
		brcmf_dbg(BCDC, "%s: BDC rcv, good checksum, flags 0x%x\n",
			  brcmf_ifname(drvr, *ifidx), h->flags);
		pktbuf->ip_summed = CHECKSUM_UNNECESSARY;
	}

	pktbuf->priority = h->priority & BCDC_PRIORITY_MASK;

	skb_pull(pktbuf, BCDC_HEADER_LEN);
	if (do_fws)
		brcmf_fws_hdrpull(drvr, *ifidx, h->data_offset << 2, pktbuf);
	else
		skb_pull(pktbuf, h->data_offset << 2);

	if (pktbuf->len == 0)
		return -ENODATA;
	return 0;
}

static int
brcmf_proto_bcdc_txdata(struct brcmf_pub *drvr, int ifidx, u8 offset,
			struct sk_buff *pktbuf)
{
	brcmf_proto_bcdc_hdrpush(drvr, ifidx, offset, pktbuf);
	return brcmf_bus_txdata(drvr->bus_if, pktbuf);
}


int brcmf_proto_bcdc_attach(struct brcmf_pub *drvr)
{
	struct brcmf_bcdc *bcdc;

	bcdc = kzalloc(sizeof(*bcdc), GFP_ATOMIC);
	if (!bcdc)
		goto fail;

	/* ensure that the msg buf directly follows the cdc msg struct */
	if ((unsigned long)(&bcdc->msg + 1) != (unsigned long)bcdc->buf) {
		brcmf_err("struct brcmf_proto_bcdc is not correctly defined\n");
		goto fail;
	}

	drvr->proto->hdrpull = brcmf_proto_bcdc_hdrpull;
	drvr->proto->query_dcmd = brcmf_proto_bcdc_query_dcmd;
	drvr->proto->set_dcmd = brcmf_proto_bcdc_set_dcmd;
	drvr->proto->txdata = brcmf_proto_bcdc_txdata;
	drvr->proto->pd = bcdc;

	drvr->hdrlen += BCDC_HEADER_LEN + BRCMF_PROT_FW_SIGNAL_MAX_TXBYTES;
	drvr->bus_if->maxctl = BRCMF_DCMD_MAXLEN +
			sizeof(struct brcmf_proto_bcdc_dcmd);
	return 0;

fail:
	kfree(bcdc);
	return -ENOMEM;
}

void brcmf_proto_bcdc_detach(struct brcmf_pub *drvr)
{
	kfree(drvr->proto->pd);
	drvr->proto->pd = NULL;
}