summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/ath/ath6kl/htc.h
blob: 8ce0c2c07ded8b14398cddf9af42a2aff2b3e74b (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
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
/*
 * Copyright (c) 2004-2011 Atheros Communications Inc.
 *
 * 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.
 */

#ifndef HTC_H
#define HTC_H

#include "common.h"

/* frame header flags */

/* send direction */
#define HTC_FLAGS_NEED_CREDIT_UPDATE (1 << 0)
#define HTC_FLAGS_SEND_BUNDLE        (1 << 1)

/* receive direction */
#define HTC_FLG_RX_UNUSED        (1 << 0)
#define HTC_FLG_RX_TRAILER       (1 << 1)
/* Bundle count maske and shift */
#define HTC_FLG_RX_BNDL_CNT	 (0xF0)
#define HTC_FLG_RX_BNDL_CNT_S	 4

#define HTC_HDR_LENGTH  (sizeof(struct htc_frame_hdr))
#define HTC_MAX_PAYLOAD_LENGTH   (4096 - sizeof(struct htc_frame_hdr))

/* HTC control message IDs */

#define HTC_MSG_READY_ID		1
#define HTC_MSG_CONN_SVC_ID		2
#define HTC_MSG_CONN_SVC_RESP_ID	3
#define HTC_MSG_SETUP_COMPLETE_ID	4
#define HTC_MSG_SETUP_COMPLETE_EX_ID	5

#define HTC_MAX_CTRL_MSG_LEN  256

#define HTC_VERSION_2P0  0x00
#define HTC_VERSION_2P1  0x01

#define HTC_SERVICE_META_DATA_MAX_LENGTH 128

#define HTC_CONN_FLGS_THRESH_LVL_QUAT		0x0
#define HTC_CONN_FLGS_THRESH_LVL_HALF		0x1
#define HTC_CONN_FLGS_THRESH_LVL_THREE_QUAT	0x2
#define HTC_CONN_FLGS_REDUCE_CRED_DRIB		0x4
#define HTC_CONN_FLGS_THRESH_MASK		0x3

/* connect response status codes */
#define HTC_SERVICE_SUCCESS      0
#define HTC_SERVICE_NOT_FOUND    1
#define HTC_SERVICE_FAILED       2

/* no resources (i.e. no more endpoints) */
#define HTC_SERVICE_NO_RESOURCES 3

/* specific service is not allowing any more endpoints */
#define HTC_SERVICE_NO_MORE_EP   4

/* report record IDs */
#define HTC_RECORD_NULL             0
#define HTC_RECORD_CREDITS          1
#define HTC_RECORD_LOOKAHEAD        2
#define HTC_RECORD_LOOKAHEAD_BUNDLE 3

#define HTC_SETUP_COMP_FLG_RX_BNDL_EN     (1 << 0)

#define MAKE_SERVICE_ID(group, index) \
	(int)(((int)group << 8) | (int)(index))

/* NOTE: service ID of 0x0000 is reserved and should never be used */
#define HTC_CTRL_RSVD_SVC MAKE_SERVICE_ID(RSVD_SERVICE_GROUP, 1)
#define WMI_CONTROL_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 0)
#define WMI_DATA_BE_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 1)
#define WMI_DATA_BK_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 2)
#define WMI_DATA_VI_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 3)
#define WMI_DATA_VO_SVC   MAKE_SERVICE_ID(WMI_SERVICE_GROUP, 4)
#define WMI_MAX_SERVICES  5

/* reserved and used to flush ALL packets */
#define HTC_TX_PACKET_TAG_ALL          0
#define HTC_SERVICE_TX_PACKET_TAG      1
#define HTC_TX_PACKET_TAG_USER_DEFINED (HTC_SERVICE_TX_PACKET_TAG + 9)

/* more packets on this endpoint are being fetched */
#define HTC_RX_FLAGS_INDICATE_MORE_PKTS  (1 << 0)

/* TODO.. for BMI */
#define ENDPOINT1 0
/* TODO -remove me, but we have to fix BMI first */
#define HTC_MAILBOX_NUM_MAX    4

/* enable send bundle padding for this endpoint */
#define HTC_FLGS_TX_BNDL_PAD_EN	 (1 << 0)
#define HTC_EP_ACTIVE                            ((u32) (1u << 31))

/* HTC operational parameters */
#define HTC_TARGET_RESPONSE_TIMEOUT        2000	/* in ms */
#define HTC_TARGET_DEBUG_INTR_MASK         0x01
#define HTC_TARGET_CREDIT_INTR_MASK        0xF0

#define HTC_HOST_MAX_MSG_PER_BUNDLE        8
#define HTC_MIN_HTC_MSGS_TO_BUNDLE         2

/* packet flags */

#define HTC_RX_PKT_IGNORE_LOOKAHEAD      (1 << 0)
#define HTC_RX_PKT_REFRESH_HDR           (1 << 1)
#define HTC_RX_PKT_PART_OF_BUNDLE        (1 << 2)
#define HTC_RX_PKT_NO_RECYCLE            (1 << 3)

#define NUM_CONTROL_BUFFERS     8
#define NUM_CONTROL_TX_BUFFERS  2
#define NUM_CONTROL_RX_BUFFERS  (NUM_CONTROL_BUFFERS - NUM_CONTROL_TX_BUFFERS)

#define HTC_RECV_WAIT_BUFFERS        (1 << 0)
#define HTC_OP_STATE_STOPPING        (1 << 0)

/*
 * The frame header length and message formats defined herein were selected
 * to accommodate optimal alignment for target processing. This reduces
 * code size and improves performance. Any changes to the header length may
 * alter the alignment and cause exceptions on the target. When adding to
 * the messagestructures insure that fields are properly aligned.
 */

/* HTC frame header
 *
 * NOTE: do not remove or re-arrange the fields, these are minimally
 * required to take advantage of 4-byte lookaheads in some hardware
 * implementations.
 */
struct htc_frame_hdr {
	u8 eid;
	u8 flags;

	/* length of data (including trailer) that follows the header */
	__le16 payld_len;

	/* end of 4-byte lookahead */

	u8 ctrl[2];
} __packed;

/* HTC ready message */
struct htc_ready_msg {
	__le16 msg_id;
	__le16 cred_cnt;
	__le16 cred_sz;
	u8 max_ep;
	u8 pad;
} __packed;

/* extended HTC ready message */
struct htc_ready_ext_msg {
	struct htc_ready_msg ver2_0_info;
	u8 htc_ver;
	u8 msg_per_htc_bndl;
} __packed;

/* connect service */
struct htc_conn_service_msg {
	__le16 msg_id;
	__le16 svc_id;
	__le16 conn_flags;
	u8 svc_meta_len;
	u8 pad;
} __packed;

/* connect response */
struct htc_conn_service_resp {
	__le16 msg_id;
	__le16 svc_id;
	u8 status;
	u8 eid;
	__le16 max_msg_sz;
	u8 svc_meta_len;
	u8 pad;
} __packed;

struct htc_setup_comp_msg {
	__le16 msg_id;
} __packed;

/* extended setup completion message */
struct htc_setup_comp_ext_msg {
	__le16 msg_id;
	__le32 flags;
	u8 msg_per_rxbndl;
	u8 Rsvd[3];
} __packed;

struct htc_record_hdr {
	u8 rec_id;
	u8 len;
} __packed;

struct htc_credit_report {
	u8 eid;
	u8 credits;
} __packed;

/*
 * NOTE: The lk_ahd array is guarded by a pre_valid
 * and Post Valid guard bytes. The pre_valid bytes must
 * equal the inverse of the post_valid byte.
 */
struct htc_lookahead_report {
	u8 pre_valid;
	u8 lk_ahd[4];
	u8 post_valid;
} __packed;

struct htc_bundle_lkahd_rpt {
	u8 lk_ahd[4];
} __packed;

/* Current service IDs */

enum htc_service_grp_ids {
	RSVD_SERVICE_GROUP = 0,
	WMI_SERVICE_GROUP = 1,

	HTC_TEST_GROUP = 254,
	HTC_SERVICE_GROUP_LAST = 255
};

/* ------ endpoint IDS ------ */

enum htc_endpoint_id {
	ENDPOINT_UNUSED = -1,
	ENDPOINT_0 = 0,
	ENDPOINT_1 = 1,
	ENDPOINT_2 = 2,
	ENDPOINT_3,
	ENDPOINT_4,
	ENDPOINT_5,
	ENDPOINT_6,
	ENDPOINT_7,
	ENDPOINT_8,
	ENDPOINT_MAX,
};

struct htc_tx_packet_info {
	u16 tag;
	int cred_used;
	u8 flags;
	int seqno;
};

struct htc_rx_packet_info {
	u32 exp_hdr;
	u32 rx_flags;
	u32 indicat_flags;
};

struct htc_target;

/* wrapper around endpoint-specific packets */
struct htc_packet {
	struct list_head list;

	/* caller's per packet specific context */
	void *pkt_cntxt;

	/*
	 * the true buffer start , the caller can store the real
	 * buffer start here.  In receive callbacks, the HTC layer
	 * sets buf to the start of the payload past the header.
	 * This field allows the caller to reset buf when it recycles
	 * receive packets back to HTC.
	 */
	u8 *buf_start;

	/*
	 * Pointer to the start of the buffer. In the transmit
	 * direction this points to the start of the payload. In the
	 * receive direction, however, the buffer when queued up
	 * points to the start of the HTC header but when returned
	 * to the caller points to the start of the payload
	 */
	u8 *buf;
	u32 buf_len;

	/* actual length of payload */
	u32 act_len;

	/* endpoint that this packet was sent/recv'd from */
	enum htc_endpoint_id endpoint;

	/* completion status */

	int status;
	union {
		struct htc_tx_packet_info tx;
		struct htc_rx_packet_info rx;
	} info;

	void (*completion) (struct htc_target *, struct htc_packet *);
	struct htc_target *context;
};

enum htc_send_full_action {
	HTC_SEND_FULL_KEEP = 0,
	HTC_SEND_FULL_DROP = 1,
};

struct htc_ep_callbacks {
	void (*rx) (struct htc_target *, struct htc_packet *);
	void (*rx_refill) (struct htc_target *, enum htc_endpoint_id endpoint);
	enum htc_send_full_action (*tx_full) (struct htc_target *,
					      struct htc_packet *);
	struct htc_packet *(*rx_allocthresh) (struct htc_target *,
					      enum htc_endpoint_id, int);
	int rx_alloc_thresh;
	int rx_refill_thresh;
};

/* service connection information */
struct htc_service_connect_req {
	u16 svc_id;
	u16 conn_flags;
	struct htc_ep_callbacks ep_cb;
	int max_txq_depth;
	u32 flags;
	unsigned int max_rxmsg_sz;
};

/* service connection response information */
struct htc_service_connect_resp {
	u8 buf_len;
	u8 act_len;
	enum htc_endpoint_id endpoint;
	unsigned int len_max;
	u8 resp_code;
};

/* endpoint distributionstructure */
struct htc_endpoint_credit_dist {
	struct list_head list;

	/* Service ID (set by HTC) */
	u16 svc_id;

	/* endpoint for this distributionstruct (set by HTC) */
	enum htc_endpoint_id endpoint;

	u32 dist_flags;

	/*
	 * credits for normal operation, anything above this
	 * indicates the endpoint is over-subscribed.
	 */
	int cred_norm;

	/* floor for credit distribution */
	int cred_min;

	int cred_assngd;

	/* current credits available */
	int credits;

	/*
	 * pending credits to distribute on this endpoint, this
	 * is set by HTC when credit reports arrive.  The credit
	 * distribution functions sets this to zero when it distributes
	 * the credits.
	 */
	int cred_to_dist;

	/*
	 * the number of credits that the current pending TX packet needs
	 * to transmit. This is set by HTC when endpoint needs credits in
	 * order to transmit.
	 */
	int seek_cred;

	/* size in bytes of each credit */
	int cred_sz;

	/* credits required for a maximum sized messages */
	int cred_per_msg;

	/* reserved for HTC use */
	void *htc_rsvd;

	/*
	 * current depth of TX queue , i.e. messages waiting for credits
	 * This field is valid only when HTC_CREDIT_DIST_ACTIVITY_CHANGE
	 * or HTC_CREDIT_DIST_SEND_COMPLETE is indicated on an endpoint
	 * that has non-zero credits to recover.
	 */
	int txq_depth;
};

/*
 * credit distibution code that is passed into the distrbution function,
 * there are mandatory and optional codes that must be handled
 */
enum htc_credit_dist_reason {
	HTC_CREDIT_DIST_SEND_COMPLETE = 0,
	HTC_CREDIT_DIST_ACTIVITY_CHANGE = 1,
	HTC_CREDIT_DIST_SEEK_CREDITS,
};

struct htc_credit_state_info {
	int total_avail_credits;
	int cur_free_credits;
	struct list_head lowestpri_ep_dist;
};

/* endpoint statistics */
struct htc_endpoint_stats {
	/*
	 * number of times the host set the credit-low flag in a send
	 * message on this endpoint
	 */
	u32 cred_low_indicate;

	u32 tx_issued;
	u32 tx_pkt_bundled;
	u32 tx_bundles;
	u32 tx_dropped;

	/* running count of total credit reports received for this endpoint */
	u32 tx_cred_rpt;

	/* credit reports received from this endpoint's RX packets */
	u32 cred_rpt_from_rx;

	/* credit reports received from RX packets of other endpoints */
	u32 cred_rpt_from_other;

	/* credit reports received from endpoint 0 RX packets */
	u32 cred_rpt_ep0;

	/* count of credits received via Rx packets on this endpoint */
	u32 cred_from_rx;

	/* count of credits received via another endpoint */
	u32 cred_from_other;

	/* count of credits received via another endpoint */
	u32 cred_from_ep0;

	/* count of consummed credits */
	u32 cred_cosumd;

	/* count of credits returned */
	u32 cred_retnd;

	u32 rx_pkts;

	/* count of lookahead records found in Rx msg */
	u32 rx_lkahds;

	/* count of recv packets received in a bundle */
	u32 rx_bundl;

	/* count of number of bundled lookaheads */
	u32 rx_bundle_lkahd;

	/* count of the number of bundle indications from the HTC header */
	u32 rx_bundle_from_hdr;

	/* the number of times the recv allocation threshold was hit */
	u32 rx_alloc_thresh_hit;

	/* total number of bytes */
	u32 rxalloc_thresh_byte;
};

struct htc_endpoint {
	enum htc_endpoint_id eid;
	u16 svc_id;
	struct list_head txq;
	struct list_head rx_bufq;
	struct htc_endpoint_credit_dist cred_dist;
	struct htc_ep_callbacks ep_cb;
	int max_txq_depth;
	int len_max;
	int tx_proc_cnt;
	int rx_proc_cnt;
	struct htc_target *target;
	u8 seqno;
	u32 conn_flags;
	struct htc_endpoint_stats ep_st;
};

struct htc_control_buffer {
	struct htc_packet packet;
	u8 *buf;
};

struct ath6kl_device;

/* our HTC target state */
struct htc_target {
	struct htc_endpoint endpoint[ENDPOINT_MAX];
	struct list_head cred_dist_list;
	struct list_head free_ctrl_txbuf;
	struct list_head free_ctrl_rxbuf;
	struct htc_credit_state_info *cred_dist_cntxt;
	int tgt_creds;
	unsigned int tgt_cred_sz;
	spinlock_t htc_lock;
	spinlock_t rx_lock;
	spinlock_t tx_lock;
	struct ath6kl_device *dev;
	u32 htc_flags;
	u32 rx_st_flags;
	enum htc_endpoint_id ep_waiting;
	u8 htc_tgt_ver;

	/* max messages per bundle for HTC */
	int msg_per_bndl_max;

	bool tx_bndl_enable;
	int rx_bndl_enable;
	int max_rx_bndl_sz;
	int max_tx_bndl_sz;

	u32 block_sz;
	u32 block_mask;

	int max_scat_entries;
	int max_xfer_szper_scatreq;

	int chk_irq_status_cnt;
};

void *ath6kl_htc_create(struct ath6kl *ar);
void ath6kl_htc_set_credit_dist(struct htc_target *target,
				struct htc_credit_state_info *cred_info,
				u16 svc_pri_order[], int len);
int ath6kl_htc_wait_target(struct htc_target *target);
int ath6kl_htc_start(struct htc_target *target);
int ath6kl_htc_conn_service(struct htc_target *target,
			    struct htc_service_connect_req *req,
			    struct htc_service_connect_resp *resp);
int ath6kl_htc_tx(struct htc_target *target, struct htc_packet *packet);
void ath6kl_htc_stop(struct htc_target *target);
void ath6kl_htc_cleanup(struct htc_target *target);
void ath6kl_htc_flush_txep(struct htc_target *target,
			   enum htc_endpoint_id endpoint, u16 tag);
void ath6kl_htc_flush_rx_buf(struct htc_target *target);
void ath6kl_htc_indicate_activity_change(struct htc_target *target,
					 enum htc_endpoint_id endpoint,
					 bool active);
int ath6kl_htc_get_rxbuf_num(struct htc_target *target,
			     enum htc_endpoint_id endpoint);
int ath6kl_htc_add_rxbuf_multiple(struct htc_target *target,
				  struct list_head *pktq);
int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target,
				     u32 msg_look_ahead[], int *n_pkts);

static inline void set_htc_pkt_info(struct htc_packet *packet, void *context,
				    u8 *buf, unsigned int len,
				    enum htc_endpoint_id eid, u16 tag)
{
	packet->pkt_cntxt = context;
	packet->buf = buf;
	packet->act_len = len;
	packet->endpoint = eid;
	packet->info.tx.tag = tag;
}

static inline void htc_rxpkt_reset(struct htc_packet *packet)
{
	packet->buf = packet->buf_start;
	packet->act_len = 0;
}

static inline void set_htc_rxpkt_info(struct htc_packet *packet, void *context,
				      u8 *buf, unsigned long len,
				      enum htc_endpoint_id eid)
{
	packet->pkt_cntxt = context;
	packet->buf = buf;
	packet->buf_start = buf;
	packet->buf_len = len;
	packet->endpoint = eid;
}

static inline int get_queue_depth(struct list_head *queue)
{
	struct list_head *tmp_list;
	int depth = 0;

	list_for_each(tmp_list, queue)
	    depth++;

	return depth;
}

#endif