summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwlwifi/iwl-trans.h
blob: 0cac2b7af78b99eb1e8c8951a9638c12033e382c (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
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2007 - 2013 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/
#ifndef __iwl_trans_h__
#define __iwl_trans_h__

#include <linux/ieee80211.h>
#include <linux/mm.h> /* for page_address */
#include <linux/lockdep.h>

#include "iwl-debug.h"
#include "iwl-config.h"
#include "iwl-fw.h"

/**
 * DOC: Transport layer - what is it ?
 *
 * The tranport layer is the layer that deals with the HW directly. It provides
 * an abstraction of the underlying HW to the upper layer. The transport layer
 * doesn't provide any policy, algorithm or anything of this kind, but only
 * mechanisms to make the HW do something.It is not completely stateless but
 * close to it.
 * We will have an implementation for each different supported bus.
 */

/**
 * DOC: Life cycle of the transport layer
 *
 * The transport layer has a very precise life cycle.
 *
 *	1) A helper function is called during the module initialization and
 *	   registers the bus driver's ops with the transport's alloc function.
 *	2) Bus's probe calls to the transport layer's allocation functions.
 *	   Of course this function is bus specific.
 *	3) This allocation functions will spawn the upper layer which will
 *	   register mac80211.
 *
 *	4) At some point (i.e. mac80211's start call), the op_mode will call
 *	   the following sequence:
 *	   start_hw
 *	   start_fw
 *
 *	5) Then when finished (or reset):
 *	   stop_fw (a.k.a. stop device for the moment)
 *	   stop_hw
 *
 *	6) Eventually, the free function will be called.
 */

/**
 * DOC: Host command section
 *
 * A host command is a commaned issued by the upper layer to the fw. There are
 * several versions of fw that have several APIs. The transport layer is
 * completely agnostic to these differences.
 * The transport does provide helper functionnality (i.e. SYNC / ASYNC mode),
 */
#define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
#define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
#define MAX_SN ((IEEE80211_SCTL_SEQ) >> 4)
#define SEQ_TO_QUEUE(s)	(((s) >> 8) & 0x1f)
#define QUEUE_TO_SEQ(q)	(((q) & 0x1f) << 8)
#define SEQ_TO_INDEX(s)	((s) & 0xff)
#define INDEX_TO_SEQ(i)	((i) & 0xff)
#define SEQ_RX_FRAME	cpu_to_le16(0x8000)

/**
 * struct iwl_cmd_header
 *
 * This header format appears in the beginning of each command sent from the
 * driver, and each response/notification received from uCode.
 */
struct iwl_cmd_header {
	u8 cmd;		/* Command ID:  REPLY_RXON, etc. */
	u8 flags;	/* 0:5 reserved, 6 abort, 7 internal */
	/*
	 * The driver sets up the sequence number to values of its choosing.
	 * uCode does not use this value, but passes it back to the driver
	 * when sending the response to each driver-originated command, so
	 * the driver can match the response to the command.  Since the values
	 * don't get used by uCode, the driver may set up an arbitrary format.
	 *
	 * There is one exception:  uCode sets bit 15 when it originates
	 * the response/notification, i.e. when the response/notification
	 * is not a direct response to a command sent by the driver.  For
	 * example, uCode issues REPLY_RX when it sends a received frame
	 * to the driver; it is not a direct response to any driver command.
	 *
	 * The Linux driver uses the following format:
	 *
	 *  0:7		tfd index - position within TX queue
	 *  8:12	TX queue id
	 *  13:14	reserved
	 *  15		unsolicited RX or uCode-originated notification
	 */
	__le16 sequence;
} __packed;

/* iwl_cmd_header flags value */
#define IWL_CMD_FAILED_MSK 0x40


#define FH_RSCSR_FRAME_SIZE_MSK		0x00003FFF	/* bits 0-13 */
#define FH_RSCSR_FRAME_INVALID		0x55550000
#define FH_RSCSR_FRAME_ALIGN		0x40

struct iwl_rx_packet {
	/*
	 * The first 4 bytes of the RX frame header contain both the RX frame
	 * size and some flags.
	 * Bit fields:
	 * 31:    flag flush RB request
	 * 30:    flag ignore TC (terminal counter) request
	 * 29:    flag fast IRQ request
	 * 28-14: Reserved
	 * 13-00: RX frame size
	 */
	__le32 len_n_flags;
	struct iwl_cmd_header hdr;
	u8 data[];
} __packed;

/**
 * enum CMD_MODE - how to send the host commands ?
 *
 * @CMD_SYNC: The caller will be stalled until the fw responds to the command
 * @CMD_ASYNC: Return right away and don't want for the response
 * @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
 *	response. The caller needs to call iwl_free_resp when done.
 * @CMD_ON_DEMAND: This command is sent by the test mode pipe.
 */
enum CMD_MODE {
	CMD_SYNC		= 0,
	CMD_ASYNC		= BIT(0),
	CMD_WANT_SKB		= BIT(1),
	CMD_ON_DEMAND		= BIT(2),
};

#define DEF_CMD_PAYLOAD_SIZE 320

/**
 * struct iwl_device_cmd
 *
 * For allocation of the command and tx queues, this establishes the overall
 * size of the largest command we send to uCode, except for commands that
 * aren't fully copied and use other TFD space.
 */
struct iwl_device_cmd {
	struct iwl_cmd_header hdr;	/* uCode API */
	u8 payload[DEF_CMD_PAYLOAD_SIZE];
} __packed;

#define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))

/*
 * number of transfer buffers (fragments) per transmit frame descriptor;
 * this is just the driver's idea, the hardware supports 20
 */
#define IWL_MAX_CMD_TBS_PER_TFD	2

/**
 * struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
 *
 * @IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
 *	ring. The transport layer doesn't map the command's buffer to DMA, but
 *	rather copies it to an previously allocated DMA buffer. This flag tells
 *	the transport layer not to copy the command, but to map the existing
 *	buffer (that is passed in) instead. This saves the memcpy and allows
 *	commands that are bigger than the fixed buffer to be submitted.
 *	Note that a TFD entry after a NOCOPY one cannot be a normal copied one.
 * @IWL_HCMD_DFL_DUP: Only valid without NOCOPY, duplicate the memory for this
 *	chunk internally and free it again after the command completes. This
 *	can (currently) be used only once per command.
 *	Note that a TFD entry after a DUP one cannot be a normal copied one.
 */
enum iwl_hcmd_dataflag {
	IWL_HCMD_DFL_NOCOPY	= BIT(0),
	IWL_HCMD_DFL_DUP	= BIT(1),
};

/**
 * struct iwl_host_cmd - Host command to the uCode
 *
 * @data: array of chunks that composes the data of the host command
 * @resp_pkt: response packet, if %CMD_WANT_SKB was set
 * @_rx_page_order: (internally used to free response packet)
 * @_rx_page_addr: (internally used to free response packet)
 * @handler_status: return value of the handler of the command
 *	(put in setup_rx_handlers) - valid for SYNC mode only
 * @flags: can be CMD_*
 * @len: array of the lenths of the chunks in data
 * @dataflags: IWL_HCMD_DFL_*
 * @id: id of the host command
 */
struct iwl_host_cmd {
	const void *data[IWL_MAX_CMD_TBS_PER_TFD];
	struct iwl_rx_packet *resp_pkt;
	unsigned long _rx_page_addr;
	u32 _rx_page_order;
	int handler_status;

	u32 flags;
	u16 len[IWL_MAX_CMD_TBS_PER_TFD];
	u8 dataflags[IWL_MAX_CMD_TBS_PER_TFD];
	u8 id;
};

static inline void iwl_free_resp(struct iwl_host_cmd *cmd)
{
	free_pages(cmd->_rx_page_addr, cmd->_rx_page_order);
}

struct iwl_rx_cmd_buffer {
	struct page *_page;
	int _offset;
	bool _page_stolen;
	u32 _rx_page_order;
	unsigned int truesize;
};

static inline void *rxb_addr(struct iwl_rx_cmd_buffer *r)
{
	return (void *)((unsigned long)page_address(r->_page) + r->_offset);
}

static inline int rxb_offset(struct iwl_rx_cmd_buffer *r)
{
	return r->_offset;
}

static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
{
	r->_page_stolen = true;
	get_page(r->_page);
	return r->_page;
}

static inline void iwl_free_rxb(struct iwl_rx_cmd_buffer *r)
{
	__free_pages(r->_page, r->_rx_page_order);
}

#define MAX_NO_RECLAIM_CMDS	6

#define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))

/*
 * Maximum number of HW queues the transport layer
 * currently supports
 */
#define IWL_MAX_HW_QUEUES		32
#define IWL_INVALID_STATION	255
#define IWL_MAX_TID_COUNT	8
#define IWL_FRAME_LIMIT	64

/**
 * enum iwl_wowlan_status - WoWLAN image/device status
 * @IWL_D3_STATUS_ALIVE: firmware is still running after resume
 * @IWL_D3_STATUS_RESET: device was reset while suspended
 */
enum iwl_d3_status {
	IWL_D3_STATUS_ALIVE,
	IWL_D3_STATUS_RESET,
};

/**
 * struct iwl_trans_config - transport configuration
 *
 * @op_mode: pointer to the upper layer.
 * @cmd_queue: the index of the command queue.
 *	Must be set before start_fw.
 * @cmd_fifo: the fifo for host commands
 * @no_reclaim_cmds: Some devices erroneously don't set the
 *	SEQ_RX_FRAME bit on some notifications, this is the
 *	list of such notifications to filter. Max length is
 *	%MAX_NO_RECLAIM_CMDS.
 * @n_no_reclaim_cmds: # of commands in list
 * @rx_buf_size_8k: 8 kB RX buffer size needed for A-MSDUs,
 *	if unset 4k will be the RX buffer size
 * @bc_table_dword: set to true if the BC table expects the byte count to be
 *	in DWORD (as opposed to bytes)
 * @queue_watchdog_timeout: time (in ms) after which queues
 *	are considered stuck and will trigger device restart
 * @command_names: array of command names, must be 256 entries
 *	(one for each command); for debugging only
 */
struct iwl_trans_config {
	struct iwl_op_mode *op_mode;

	u8 cmd_queue;
	u8 cmd_fifo;
	const u8 *no_reclaim_cmds;
	int n_no_reclaim_cmds;

	bool rx_buf_size_8k;
	bool bc_table_dword;
	unsigned int queue_watchdog_timeout;
	const char **command_names;
};

struct iwl_trans;

/**
 * struct iwl_trans_ops - transport specific operations
 *
 * All the handlers MUST be implemented
 *
 * @start_hw: starts the HW- from that point on, the HW can send interrupts
 *	May sleep
 * @stop_hw: stops the HW- from that point on, the HW will be in low power but
 *	will still issue interrupt if the HW RF kill is triggered unless
 *	op_mode_leaving is true.
 *	May sleep
 * @start_fw: allocates and inits all the resources for the transport
 *	layer. Also kick a fw image.
 *	May sleep
 * @fw_alive: called when the fw sends alive notification. If the fw provides
 *	the SCD base address in SRAM, then provide it here, or 0 otherwise.
 *	May sleep
 * @stop_device:stops the whole device (embedded CPU put to reset)
 *	May sleep
 * @d3_suspend: put the device into the correct mode for WoWLAN during
 *	suspend. This is optional, if not implemented WoWLAN will not be
 *	supported. This callback may sleep.
 * @d3_resume: resume the device after WoWLAN, enabling the opmode to
 *	talk to the WoWLAN image to get its status. This is optional, if not
 *	implemented WoWLAN will not be supported. This callback may sleep.
 * @send_cmd:send a host command. Must return -ERFKILL if RFkill is asserted.
 *	If RFkill is asserted in the middle of a SYNC host command, it must
 *	return -ERFKILL straight away.
 *	May sleep only if CMD_SYNC is set
 * @tx: send an skb
 *	Must be atomic
 * @reclaim: free packet until ssn. Returns a list of freed packets.
 *	Must be atomic
 * @txq_enable: setup a queue. To setup an AC queue, use the
 *	iwl_trans_ac_txq_enable wrapper. fw_alive must have been called before
 *	this one. The op_mode must not configure the HCMD queue. May sleep.
 * @txq_disable: de-configure a Tx queue to send AMPDUs
 *	Must be atomic
 * @wait_tx_queue_empty: wait until all tx queues are empty
 *	May sleep
 * @dbgfs_register: add the dbgfs files under this directory. Files will be
 *	automatically deleted.
 * @suspend: stop the device unless WoWLAN is configured
 * @resume: resume activity of the device
 * @write8: write a u8 to a register at offset ofs from the BAR
 * @write32: write a u32 to a register at offset ofs from the BAR
 * @read32: read a u32 register at offset ofs from the BAR
 * @read_prph: read a DWORD from a periphery register
 * @write_prph: write a DWORD to a periphery register
 * @read_mem: read device's SRAM in DWORD
 * @write_mem: write device's SRAM in DWORD. If %buf is %NULL, then the memory
 *	will be zeroed.
 * @configure: configure parameters required by the transport layer from
 *	the op_mode. May be called several times before start_fw, can't be
 *	called after that.
 * @set_pmi: set the power pmi state
 * @grab_nic_access: wake the NIC to be able to access non-HBUS regs.
 *	Sleeping is not allowed between grab_nic_access and
 *	release_nic_access.
 * @release_nic_access: let the NIC go to sleep. The "flags" parameter
 *	must be the same one that was sent before to the grab_nic_access.
 * @set_bits_mask - set SRAM register according to value and mask.
 */
struct iwl_trans_ops {

	int (*start_hw)(struct iwl_trans *iwl_trans);
	void (*stop_hw)(struct iwl_trans *iwl_trans, bool op_mode_leaving);
	int (*start_fw)(struct iwl_trans *trans, const struct fw_img *fw,
			bool run_in_rfkill);
	void (*fw_alive)(struct iwl_trans *trans, u32 scd_addr);
	void (*stop_device)(struct iwl_trans *trans);

	void (*d3_suspend)(struct iwl_trans *trans);
	int (*d3_resume)(struct iwl_trans *trans, enum iwl_d3_status *status);

	int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);

	int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
		  struct iwl_device_cmd *dev_cmd, int queue);
	void (*reclaim)(struct iwl_trans *trans, int queue, int ssn,
			struct sk_buff_head *skbs);

	void (*txq_enable)(struct iwl_trans *trans, int queue, int fifo,
			   int sta_id, int tid, int frame_limit, u16 ssn);
	void (*txq_disable)(struct iwl_trans *trans, int queue);

	int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
	int (*wait_tx_queue_empty)(struct iwl_trans *trans);
#ifdef CONFIG_PM_SLEEP
	int (*suspend)(struct iwl_trans *trans);
	int (*resume)(struct iwl_trans *trans);
#endif
	void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
	void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
	u32 (*read32)(struct iwl_trans *trans, u32 ofs);
	u32 (*read_prph)(struct iwl_trans *trans, u32 ofs);
	void (*write_prph)(struct iwl_trans *trans, u32 ofs, u32 val);
	int (*read_mem)(struct iwl_trans *trans, u32 addr,
			void *buf, int dwords);
	int (*write_mem)(struct iwl_trans *trans, u32 addr,
			 void *buf, int dwords);
	void (*configure)(struct iwl_trans *trans,
			  const struct iwl_trans_config *trans_cfg);
	void (*set_pmi)(struct iwl_trans *trans, bool state);
	bool (*grab_nic_access)(struct iwl_trans *trans, bool silent,
				unsigned long *flags);
	void (*release_nic_access)(struct iwl_trans *trans,
				   unsigned long *flags);
	void (*set_bits_mask)(struct iwl_trans *trans, u32 reg, u32 mask,
			      u32 value);
};

/**
 * enum iwl_trans_state - state of the transport layer
 *
 * @IWL_TRANS_NO_FW: no fw has sent an alive response
 * @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
 */
enum iwl_trans_state {
	IWL_TRANS_NO_FW = 0,
	IWL_TRANS_FW_ALIVE	= 1,
};

/**
 * struct iwl_trans - transport common data
 *
 * @ops - pointer to iwl_trans_ops
 * @op_mode - pointer to the op_mode
 * @cfg - pointer to the configuration
 * @dev - pointer to struct device * that represents the device
 * @hw_id: a u32 with the ID of the device / subdevice.
 *	Set during transport allocation.
 * @hw_id_str: a string with info about HW ID. Set during transport allocation.
 * @pm_support: set to true in start_hw if link pm is supported
 * @dev_cmd_pool: pool for Tx cmd allocation - for internal use only.
 *	The user should use iwl_trans_{alloc,free}_tx_cmd.
 * @dev_cmd_headroom: room needed for the transport's private use before the
 *	device_cmd for Tx - for internal use only
 *	The user should use iwl_trans_{alloc,free}_tx_cmd.
 * @rx_mpdu_cmd: MPDU RX command ID, must be assigned by opmode before
 *	starting the firmware, used for tracing
 * @rx_mpdu_cmd_hdr_size: used for tracing, amount of data before the
 *	start of the 802.11 header in the @rx_mpdu_cmd
 */
struct iwl_trans {
	const struct iwl_trans_ops *ops;
	struct iwl_op_mode *op_mode;
	const struct iwl_cfg *cfg;
	enum iwl_trans_state state;

	struct device *dev;
	u32 hw_rev;
	u32 hw_id;
	char hw_id_str[52];

	u8 rx_mpdu_cmd, rx_mpdu_cmd_hdr_size;

	bool pm_support;

	/* The following fields are internal only */
	struct kmem_cache *dev_cmd_pool;
	size_t dev_cmd_headroom;
	char dev_cmd_pool_name[50];

	struct dentry *dbgfs_dir;

#ifdef CONFIG_LOCKDEP
	struct lockdep_map sync_cmd_lockdep_map;
#endif

	/* pointer to trans specific struct */
	/*Ensure that this pointer will always be aligned to sizeof pointer */
	char trans_specific[0] __aligned(sizeof(void *));
};

static inline void iwl_trans_configure(struct iwl_trans *trans,
				       const struct iwl_trans_config *trans_cfg)
{
	trans->op_mode = trans_cfg->op_mode;

	trans->ops->configure(trans, trans_cfg);
}

static inline int iwl_trans_start_hw(struct iwl_trans *trans)
{
	might_sleep();

	return trans->ops->start_hw(trans);
}

static inline void iwl_trans_stop_hw(struct iwl_trans *trans,
				     bool op_mode_leaving)
{
	might_sleep();

	trans->ops->stop_hw(trans, op_mode_leaving);

	if (op_mode_leaving)
		trans->op_mode = NULL;

	trans->state = IWL_TRANS_NO_FW;
}

static inline void iwl_trans_fw_alive(struct iwl_trans *trans, u32 scd_addr)
{
	might_sleep();

	trans->state = IWL_TRANS_FW_ALIVE;

	trans->ops->fw_alive(trans, scd_addr);
}

static inline int iwl_trans_start_fw(struct iwl_trans *trans,
				     const struct fw_img *fw,
				     bool run_in_rfkill)
{
	might_sleep();

	WARN_ON_ONCE(!trans->rx_mpdu_cmd);

	return trans->ops->start_fw(trans, fw, run_in_rfkill);
}

static inline void iwl_trans_stop_device(struct iwl_trans *trans)
{
	might_sleep();

	trans->ops->stop_device(trans);

	trans->state = IWL_TRANS_NO_FW;
}

static inline void iwl_trans_d3_suspend(struct iwl_trans *trans)
{
	might_sleep();
	trans->ops->d3_suspend(trans);
}

static inline int iwl_trans_d3_resume(struct iwl_trans *trans,
				      enum iwl_d3_status *status)
{
	might_sleep();
	return trans->ops->d3_resume(trans, status);
}

static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
				     struct iwl_host_cmd *cmd)
{
	int ret;

	WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
		  "%s bad state = %d", __func__, trans->state);

	if (!(cmd->flags & CMD_ASYNC))
		lock_map_acquire_read(&trans->sync_cmd_lockdep_map);

	ret = trans->ops->send_cmd(trans, cmd);

	if (!(cmd->flags & CMD_ASYNC))
		lock_map_release(&trans->sync_cmd_lockdep_map);

	return ret;
}

static inline struct iwl_device_cmd *
iwl_trans_alloc_tx_cmd(struct iwl_trans *trans)
{
	u8 *dev_cmd_ptr = kmem_cache_alloc(trans->dev_cmd_pool, GFP_ATOMIC);

	if (unlikely(dev_cmd_ptr == NULL))
		return NULL;

	return (struct iwl_device_cmd *)
			(dev_cmd_ptr + trans->dev_cmd_headroom);
}

static inline void iwl_trans_free_tx_cmd(struct iwl_trans *trans,
					 struct iwl_device_cmd *dev_cmd)
{
	u8 *dev_cmd_ptr = (u8 *)dev_cmd - trans->dev_cmd_headroom;

	kmem_cache_free(trans->dev_cmd_pool, dev_cmd_ptr);
}

static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
			       struct iwl_device_cmd *dev_cmd, int queue)
{
	WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
		  "%s bad state = %d", __func__, trans->state);

	return trans->ops->tx(trans, skb, dev_cmd, queue);
}

static inline void iwl_trans_reclaim(struct iwl_trans *trans, int queue,
				     int ssn, struct sk_buff_head *skbs)
{
	WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
		  "%s bad state = %d", __func__, trans->state);

	trans->ops->reclaim(trans, queue, ssn, skbs);
}

static inline void iwl_trans_txq_disable(struct iwl_trans *trans, int queue)
{
	WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
		  "%s bad state = %d", __func__, trans->state);

	trans->ops->txq_disable(trans, queue);
}

static inline void iwl_trans_txq_enable(struct iwl_trans *trans, int queue,
					int fifo, int sta_id, int tid,
					int frame_limit, u16 ssn)
{
	might_sleep();

	WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
		  "%s bad state = %d", __func__, trans->state);

	trans->ops->txq_enable(trans, queue, fifo, sta_id, tid,
				 frame_limit, ssn);
}

static inline void iwl_trans_ac_txq_enable(struct iwl_trans *trans, int queue,
					   int fifo)
{
	iwl_trans_txq_enable(trans, queue, fifo, IWL_INVALID_STATION,
			     IWL_MAX_TID_COUNT, IWL_FRAME_LIMIT, 0);
}

static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
{
	WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
		  "%s bad state = %d", __func__, trans->state);

	return trans->ops->wait_tx_queue_empty(trans);
}

static inline int iwl_trans_dbgfs_register(struct iwl_trans *trans,
					   struct dentry *dir)
{
	return trans->ops->dbgfs_register(trans, dir);
}

#ifdef CONFIG_PM_SLEEP
static inline int iwl_trans_suspend(struct iwl_trans *trans)
{
	return trans->ops->suspend(trans);
}

static inline int iwl_trans_resume(struct iwl_trans *trans)
{
	return trans->ops->resume(trans);
}
#endif

static inline void iwl_trans_write8(struct iwl_trans *trans, u32 ofs, u8 val)
{
	trans->ops->write8(trans, ofs, val);
}

static inline void iwl_trans_write32(struct iwl_trans *trans, u32 ofs, u32 val)
{
	trans->ops->write32(trans, ofs, val);
}

static inline u32 iwl_trans_read32(struct iwl_trans *trans, u32 ofs)
{
	return trans->ops->read32(trans, ofs);
}

static inline u32 iwl_trans_read_prph(struct iwl_trans *trans, u32 ofs)
{
	return trans->ops->read_prph(trans, ofs);
}

static inline void iwl_trans_write_prph(struct iwl_trans *trans, u32 ofs,
					u32 val)
{
	return trans->ops->write_prph(trans, ofs, val);
}

static inline int iwl_trans_read_mem(struct iwl_trans *trans, u32 addr,
				     void *buf, int dwords)
{
	return trans->ops->read_mem(trans, addr, buf, dwords);
}

#define iwl_trans_read_mem_bytes(trans, addr, buf, bufsize)		      \
	do {								      \
		if (__builtin_constant_p(bufsize))			      \
			BUILD_BUG_ON((bufsize) % sizeof(u32));		      \
		iwl_trans_read_mem(trans, addr, buf, (bufsize) / sizeof(u32));\
	} while (0)

static inline u32 iwl_trans_read_mem32(struct iwl_trans *trans, u32 addr)
{
	u32 value;

	if (WARN_ON(iwl_trans_read_mem(trans, addr, &value, 1)))
		return 0xa5a5a5a5;

	return value;
}

static inline int iwl_trans_write_mem(struct iwl_trans *trans, u32 addr,
				      void *buf, int dwords)
{
	return trans->ops->write_mem(trans, addr, buf, dwords);
}

static inline u32 iwl_trans_write_mem32(struct iwl_trans *trans, u32 addr,
					u32 val)
{
	return iwl_trans_write_mem(trans, addr, &val, 1);
}

static inline void iwl_trans_set_pmi(struct iwl_trans *trans, bool state)
{
	trans->ops->set_pmi(trans, state);
}

static inline void
iwl_trans_set_bits_mask(struct iwl_trans *trans, u32 reg, u32 mask, u32 value)
{
	trans->ops->set_bits_mask(trans, reg, mask, value);
}

#define iwl_trans_grab_nic_access(trans, silent, flags)	\
	__cond_lock(nic_access,				\
		    likely((trans)->ops->grab_nic_access(trans, silent, flags)))

static inline void __releases(nic_access)
iwl_trans_release_nic_access(struct iwl_trans *trans, unsigned long *flags)
{
	trans->ops->release_nic_access(trans, flags);
	__release(nic_access);
}

/*****************************************************
* driver (transport) register/unregister functions
******************************************************/
int __must_check iwl_pci_register_driver(void);
void iwl_pci_unregister_driver(void);

static inline void trans_lockdep_init(struct iwl_trans *trans)
{
#ifdef CONFIG_LOCKDEP
	static struct lock_class_key __key;

	lockdep_init_map(&trans->sync_cmd_lockdep_map, "sync_cmd_lockdep_map",
			 &__key, 0);
#endif
}

#endif /* __iwl_trans_h__ */