aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wimax/i2400m/i2400m.h
blob: c806d4550212111de5c7a1e40c3334ca6349aa68 (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
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
/*
 * Intel Wireless WiMAX Connection 2400m
 * Declarations for bus-generic internal APIs
 *
 *
 * Copyright (C) 2007-2008 Intel Corporation. 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 of 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.
 *
 *
 * Intel Corporation <linux-wimax@intel.com>
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 * Yanir Lubetkin <yanirx.lubetkin@intel.com>
 *  - Initial implementation
 *
 *
 * GENERAL DRIVER ARCHITECTURE
 *
 * The i2400m driver is split in the following two major parts:
 *
 *  - bus specific driver
 *  - bus generic driver (this part)
 *
 * The bus specific driver sets up stuff specific to the bus the
 * device is connected to (USB, SDIO, PCI, tam-tam...non-authoritative
 * nor binding list) which is basically the device-model management
 * (probe/disconnect, etc), moving data from device to kernel and
 * back, doing the power saving details and reseting the device.
 *
 * For details on each bus-specific driver, see it's include file,
 * i2400m-BUSNAME.h
 *
 * The bus-generic functionality break up is:
 *
 *  - Firmware upload: fw.c - takes care of uploading firmware to the
 *        device. bus-specific driver just needs to provides a way to
 *        execute boot-mode commands and to reset the device.
 *
 *  - RX handling: rx.c - receives data from the bus-specific code and
 *        feeds it to the network or WiMAX stack or uses it to modify
 *        the driver state. bus-specific driver only has to receive
 *        frames and pass them to this module.
 *
 *  - TX handling: tx.c - manages the TX FIFO queue and provides means
 *        for the bus-specific TX code to pull data from the FIFO
 *        queue. bus-specific code just pulls frames from this module
 *        to sends them to the device.
 *
 *  - netdev glue: netdev.c - interface with Linux networking
 *        stack. Pass around data frames, and configure when the
 *        device is up and running or shutdown (through ifconfig up /
 *        down). Bus-generic only.
 *
 *  - control ops: control.c - implements various commands for
 *        controlling the device. bus-generic only.
 *
 *  - device model glue: driver.c - implements helpers for the
 *        device-model glue done by the bus-specific layer
 *        (setup/release the driver resources), turning the device on
 *        and off, handling the device reboots/resets and a few simple
 *        WiMAX stack ops.
 *
 * Code is also broken up in linux-glue / device-glue.
 *
 * Linux glue contains functions that deal mostly with gluing with the
 * rest of the Linux kernel.
 *
 * Device-glue are functions that deal mostly with the way the device
 * does things and talk the device's language.
 *
 * device-glue code is licensed BSD so other open source OSes can take
 * it to implement their drivers.
 *
 *
 * APIs AND HEADER FILES
 *
 * This bus generic code exports three APIs:
 *
 *  - HDI (host-device interface) definitions common to all busses
 *    (include/linux/wimax/i2400m.h); these can be also used by user
 *    space code.
 *  - internal API for the bus-generic code
 *  - external API for the bus-specific drivers
 *
 *
 * LIFE CYCLE:
 *
 * When the bus-specific driver probes, it allocates a network device
 * with enough space for it's data structue, that must contain a
 * &struct i2400m at the top.
 *
 * On probe, it needs to fill the i2400m members marked as [fill], as
 * well as i2400m->wimax_dev.net_dev and call i2400m_setup(). The
 * i2400m driver will only register with the WiMAX and network stacks;
 * the only access done to the device is to read the MAC address so we
 * can register a network device.
 *
 * The high-level call flow is:
 *
 * bus_probe()
 *   i2400m_setup()
 *     i2400m->bus_setup()
 *     boot rom initialization / read mac addr
 *     network / WiMAX stacks registration
 *     i2400m_dev_start()
 *       i2400m->bus_dev_start()
 *       i2400m_dev_initialize()
 *
 * The reverse applies for a disconnect() call:
 *
 * bus_disconnect()
 *   i2400m_release()
 *     i2400m_dev_stop()
 *       i2400m_dev_shutdown()
 *       i2400m->bus_dev_stop()
 *     network / WiMAX stack unregistration
 *     i2400m->bus_release()
 *
 * At this point, control and data communications are possible.
 *
 * While the device is up, it might reset. The bus-specific driver has
 * to catch that situation and call i2400m_dev_reset_handle() to deal
 * with it (reset the internal driver structures and go back to square
 * one).
 */

#ifndef __I2400M_H__
#define __I2400M_H__

#include <linux/usb.h>
#include <linux/netdevice.h>
#include <linux/completion.h>
#include <linux/rwsem.h>
#include <linux/atomic.h>
#include <net/wimax.h>
#include <linux/wimax/i2400m.h>
#include <asm/byteorder.h>

enum {
/* netdev interface */
	/*
	 * Out of NWG spec (R1_v1.2.2), 3.3.3 ASN Bearer Plane MTU Size
	 *
	 * The MTU is 1400 or less
	 */
	I2400M_MAX_MTU = 1400,
};

/* Misc constants */
enum {
	/* Size of the Boot Mode Command buffer */
	I2400M_BM_CMD_BUF_SIZE = 16 * 1024,
	I2400M_BM_ACK_BUF_SIZE = 256,
};

enum {
	/* Maximum number of bus reset can be retried */
	I2400M_BUS_RESET_RETRIES = 3,
};

/**
 * struct i2400m_poke_table - Hardware poke table for the Intel 2400m
 *
 * This structure will be used to create a device specific poke table
 * to put the device in a consistent state at boot time.
 *
 * @address: The device address to poke
 *
 * @data: The data value to poke to the device address
 *
 */
struct i2400m_poke_table{
	__le32 address;
	__le32 data;
};

#define I2400M_FW_POKE(a, d) {		\
	.address = cpu_to_le32(a),	\
	.data = cpu_to_le32(d)		\
}


/**
 * i2400m_reset_type - methods to reset a device
 *
 * @I2400M_RT_WARM: Reset without device disconnection, device handles
 *     are kept valid but state is back to power on, with firmware
 *     re-uploaded.
 * @I2400M_RT_COLD: Tell the device to disconnect itself from the bus
 *     and reconnect. Renders all device handles invalid.
 * @I2400M_RT_BUS: Tells the bus to reset the device; last measure
 *     used when both types above don't work.
 */
enum i2400m_reset_type {
	I2400M_RT_WARM,	/* first measure */
	I2400M_RT_COLD,	/* second measure */
	I2400M_RT_BUS,	/* call in artillery */
};

struct i2400m_reset_ctx;
struct i2400m_roq;
struct i2400m_barker_db;

/**
 * struct i2400m - descriptor for an Intel 2400m
 *
 * Members marked with [fill] must be filled out/initialized before
 * calling i2400m_setup().
 *
 * Note the @bus_setup/@bus_release, @bus_dev_start/@bus_dev_release
 * call pairs are very much doing almost the same, and depending on
 * the underlying bus, some stuff has to be put in one or the
 * other. The idea of setup/release is that they setup the minimal
 * amount needed for loading firmware, where us dev_start/stop setup
 * the rest needed to do full data/control traffic.
 *
 * @bus_tx_block_size: [fill] SDIO imposes a 256 block size, USB 16,
 *     so we have a tx_blk_size variable that the bus layer sets to
 *     tell the engine how much of that we need.
 *
 * @bus_tx_room_min: [fill] Minimum room required while allocating
 *     TX queue's buffer space for message header. SDIO requires
 *     224 bytes and USB 16 bytes. Refer bus specific driver code
 *     for details.
 *
 * @bus_pl_size_max: [fill] Maximum payload size.
 *
 * @bus_setup: [optional fill] Function called by the bus-generic code
 *     [i2400m_setup()] to setup the basic bus-specific communications
 *     to the the device needed to load firmware. See LIFE CYCLE above.
 *
 *     NOTE: Doesn't need to upload the firmware, as that is taken
 *     care of by the bus-generic code.
 *
 * @bus_release: [optional fill] Function called by the bus-generic
 *     code [i2400m_release()] to shutdown the basic bus-specific
 *     communications to the the device needed to load firmware. See
 *     LIFE CYCLE above.
 *
 *     This function does not need to reset the device, just tear down
 *     all the host resources created to  handle communication with
 *     the device.
 *
 * @bus_dev_start: [optional fill] Function called by the bus-generic
 *     code [i2400m_dev_start()] to do things needed to start the
 *     device. See LIFE CYCLE above.
 *
 *     NOTE: Doesn't need to upload the firmware, as that is taken
 *     care of by the bus-generic code.
 *
 * @bus_dev_stop: [optional fill] Function called by the bus-generic
 *     code [i2400m_dev_stop()] to do things needed for stopping the
 *     device. See LIFE CYCLE above.
 *
 *     This function does not need to reset the device, just tear down
 *     all the host resources created to handle communication with
 *     the device.
 *
 * @bus_tx_kick: [fill] Function called by the bus-generic code to let
 *     the bus-specific code know that there is data available in the
 *     TX FIFO for transmission to the device.
 *
 *     This function cannot sleep.
 *
 * @bus_reset: [fill] Function called by the bus-generic code to reset
 *     the device in in various ways. Doesn't need to wait for the
 *     reset to finish.
 *
 *     If warm or cold reset fail, this function is expected to do a
 *     bus-specific reset (eg: USB reset) to get the device to a
 *     working state (even if it implies device disconecction).
 *
 *     Note the warm reset is used by the firmware uploader to
 *     reinitialize the device.
 *
 *     IMPORTANT: this is called very early in the device setup
 *     process, so it cannot rely on common infrastructure being laid
 *     out.
 *
 *     IMPORTANT: don't call reset on RT_BUS with i2400m->init_mutex
 *     held, as the .pre/.post reset handlers will deadlock.
 *
 * @bus_bm_retries: [fill] How many times shall a firmware upload /
 *     device initialization be retried? Different models of the same
 *     device might need different values, hence it is set by the
 *     bus-specific driver. Note this value is used in two places,
 *     i2400m_fw_dnload() and __i2400m_dev_start(); they won't become
 *     multiplicative (__i2400m_dev_start() calling N times
 *     i2400m_fw_dnload() and this trying N times to download the
 *     firmware), as if __i2400m_dev_start() only retries if the
 *     firmware crashed while initializing the device (not in a
 *     general case).
 *
 * @bus_bm_cmd_send: [fill] Function called to send a boot-mode
 *     command. Flags are defined in 'enum i2400m_bm_cmd_flags'. This
 *     is synchronous and has to return 0 if ok or < 0 errno code in
 *     any error condition.
 *
 * @bus_bm_wait_for_ack: [fill] Function called to wait for a
 *     boot-mode notification (that can be a response to a previously
 *     issued command or an asynchronous one). Will read until all the
 *     indicated size is read or timeout. Reading more or less data
 *     than asked for is an error condition. Return 0 if ok, < 0 errno
 *     code on error.
 *
 *     The caller to this function will check if the response is a
 *     barker that indicates the device going into reset mode.
 *
 * @bus_fw_names: [fill] a NULL-terminated array with the names of the
 *     firmware images to try loading. This is made a list so we can
 *     support backward compatibility of firmware releases (eg: if we
 *     can't find the default v1.4, we try v1.3). In general, the name
 *     should be i2400m-fw-X-VERSION.sbcf, where X is the bus name.
 *     The list is tried in order and the first one that loads is
 *     used. The fw loader will set i2400m->fw_name to point to the
 *     active firmware image.
 *
 * @bus_bm_mac_addr_impaired: [fill] Set to true if the device's MAC
 *     address provided in boot mode is kind of broken and needs to
 *     be re-read later on.
 *
 * @bus_bm_pokes_table: [fill/optional] A table of device addresses
 *     and values that will be poked at device init time to move the
 *     device to the correct state for the type of boot/firmware being
 *     used.  This table MUST be terminated with (0x000000,
 *     0x00000000) or bad things will happen.
 *
 *
 * @wimax_dev: WiMAX generic device for linkage into the kernel WiMAX
 *     stack. Due to the way a net_device is allocated, we need to
 *     force this to be the first field so that we can get from
 *     netdev_priv() the right pointer.
 *
 * @updown: the device is up and ready for transmitting control and
 *     data packets. This implies @ready (communication infrastructure
 *     with the device is ready) and the device's firmware has been
 *     loaded and the device initialized.
 *
 *     Write to it only inside a i2400m->init_mutex protected area
 *     followed with a wmb(); rmb() before accesing (unless locked
 *     inside i2400m->init_mutex). Read access can be loose like that
 *     [just using rmb()] because the paths that use this also do
 *     other error checks later on.
 *
 * @ready: Communication infrastructure with the device is ready, data
 *     frames can start to be passed around (this is lighter than
 *     using the WiMAX state for certain hot paths).
 *
 *     Write to it only inside a i2400m->init_mutex protected area
 *     followed with a wmb(); rmb() before accesing (unless locked
 *     inside i2400m->init_mutex). Read access can be loose like that
 *     [just using rmb()] because the paths that use this also do
 *     other error checks later on.
 *
 * @rx_reorder: 1 if RX reordering is enabled; this can only be
 *     set at probe time.
 *
 * @state: device's state (as reported by it)
 *
 * @state_wq: waitqueue that is woken up whenever the state changes
 *
 * @tx_lock: spinlock to protect TX members
 *
 * @tx_buf: FIFO buffer for TX; we queue data here
 *
 * @tx_in: FIFO index for incoming data. Note this doesn't wrap around
 *     and it is always greater than @tx_out.
 *
 * @tx_out: FIFO index for outgoing data
 *
 * @tx_msg: current TX message that is active in the FIFO for
 *     appending payloads.
 *
 * @tx_sequence: current sequence number for TX messages from the
 *     device to the host.
 *
 * @tx_msg_size: size of the current message being transmitted by the
 *     bus-specific code.
 *
 * @tx_pl_num: total number of payloads sent
 *
 * @tx_pl_max: maximum number of payloads sent in a TX message
 *
 * @tx_pl_min: minimum number of payloads sent in a TX message
 *
 * @tx_num: number of TX messages sent
 *
 * @tx_size_acc: number of bytes in all TX messages sent
 *     (this is different to net_dev's statistics as it also counts
 *     control messages).
 *
 * @tx_size_min: smallest TX message sent.
 *
 * @tx_size_max: biggest TX message sent.
 *
 * @rx_lock: spinlock to protect RX members and rx_roq_refcount.
 *
 * @rx_pl_num: total number of payloads received
 *
 * @rx_pl_max: maximum number of payloads received in a RX message
 *
 * @rx_pl_min: minimum number of payloads received in a RX message
 *
 * @rx_num: number of RX messages received
 *
 * @rx_size_acc: number of bytes in all RX messages received
 *     (this is different to net_dev's statistics as it also counts
 *     control messages).
 *
 * @rx_size_min: smallest RX message received.
 *
 * @rx_size_max: buggest RX message received.
 *
 * @rx_roq: RX ReOrder queues. (fw >= v1.4) When packets are received
 *     out of order, the device will ask the driver to hold certain
 *     packets until the ones that are received out of order can be
 *     delivered. Then the driver can release them to the host. See
 *     drivers/net/i2400m/rx.c for details.
 *
 * @rx_roq_refcount: refcount rx_roq. This refcounts any access to
 *     rx_roq thus preventing rx_roq being destroyed when rx_roq
 *     is being accessed. rx_roq_refcount is protected by rx_lock.
 *
 * @rx_reports: reports received from the device that couldn't be
 *     processed because the driver wasn't still ready; when ready,
 *     they are pulled from here and chewed.
 *
 * @rx_reports_ws: Work struct used to kick a scan of the RX reports
 *     list and to process each.
 *
 * @src_mac_addr: MAC address used to make ethernet packets be coming
 *     from. This is generated at i2400m_setup() time and used during
 *     the life cycle of the instance. See i2400m_fake_eth_header().
 *
 * @init_mutex: Mutex used for serializing the device bringup
 *     sequence; this way if the device reboots in the middle, we
 *     don't try to do a bringup again while we are tearing down the
 *     one that failed.
 *
 *     Can't reuse @msg_mutex because from within the bringup sequence
 *     we need to send messages to the device and thus use @msg_mutex.
 *
 * @msg_mutex: mutex used to send control commands to the device (we
 *     only allow one at a time, per host-device interface design).
 *
 * @msg_completion: used to wait for an ack to a control command sent
 *     to the device.
 *
 * @ack_skb: used to store the actual ack to a control command if the
 *     reception of the command was successful. Otherwise, a ERR_PTR()
 *     errno code that indicates what failed with the ack reception.
 *
 *     Only valid after @msg_completion is woken up. Only updateable
 *     if @msg_completion is armed. Only touched by
 *     i2400m_msg_to_dev().
 *
 *     Protected by @rx_lock. In theory the command execution flow is
 *     sequential, but in case the device sends an out-of-phase or
 *     very delayed response, we need to avoid it trampling current
 *     execution.
 *
 * @bm_cmd_buf: boot mode command buffer for composing firmware upload
 *     commands.
 *
 *     USB can't r/w to stack, vmalloc, etc...as well, we end up
 *     having to alloc/free a lot to compose commands, so we use these
 *     for stagging and not having to realloc all the time.
 *
 *     This assumes the code always runs serialized. Only one thread
 *     can call i2400m_bm_cmd() at the same time.
 *
 * @bm_ack_buf: boot mode acknoledge buffer for staging reception of
 *     responses to commands.
 *
 *     See @bm_cmd_buf.
 *
 * @work_queue: work queue for processing device reports. This
 *     workqueue cannot be used for processing TX or RX to the device,
 *     as from it we'll process device reports, which might require
 *     further communication with the device.
 *
 * @debugfs_dentry: hookup for debugfs files.
 *     These have to be in a separate directory, a child of
 *     (wimax_dev->debugfs_dentry) so they can be removed when the
 *     module unloads, as we don't keep each dentry.
 *
 * @fw_name: name of the firmware image that is currently being used.
 *
 * @fw_version: version of the firmware interface, Major.minor,
 *     encoded in the high word and low word (major << 16 | minor).
 *
 * @fw_hdrs: NULL terminated array of pointers to the firmware
 *     headers. This is only available during firmware load time.
 *
 * @fw_cached: Used to cache firmware when the system goes to
 *     suspend/standby/hibernation (as on resume we can't read it). If
 *     NULL, no firmware was cached, read it. If ~0, you can't read
 *     any firmware files (the system still didn't come out of suspend
 *     and failed to cache one), so abort; otherwise, a valid cached
 *     firmware to be used. Access to this variable is protected by
 *     the spinlock i2400m->rx_lock.
 *
 * @barker: barker type that the device uses; this is initialized by
 *     i2400m_is_boot_barker() the first time it is called. Then it
 *     won't change during the life cycle of the device and every time
 *     a boot barker is received, it is just verified for it being the
 *     same.
 *
 * @pm_notifier: used to register for PM events
 *
 * @bus_reset_retries: counter for the number of bus resets attempted for
 *	this boot. It's not for tracking the number of bus resets during
 *	the whole driver life cycle (from insmod to rmmod) but for the
 *	number of dev_start() executed until dev_start() returns a success
 *	(ie: a good boot means a dev_stop() followed by a successful
 *	dev_start()). dev_reset_handler() increments this counter whenever
 *	it is triggering a bus reset. It checks this counter to decide if a
 *	subsequent bus reset should be retried. dev_reset_handler() retries
 *	the bus reset until dev_start() succeeds or the counter reaches
 *	I2400M_BUS_RESET_RETRIES. The counter is cleared to 0 in
 *	dev_reset_handle() when dev_start() returns a success,
 *	ie: a successul boot is completed.
 *
 * @alive: flag to denote if the device *should* be alive. This flag is
 *	everything like @updown (see doc for @updown) except reflecting
 *	the device state *we expect* rather than the actual state as denoted
 *	by @updown. It is set 1 whenever @updown is set 1 in dev_start().
 *	Then the device is expected to be alive all the time
 *	(i2400m->alive remains 1) until the driver is removed. Therefore
 *	all the device reboot events detected can be still handled properly
 *	by either dev_reset_handle() or .pre_reset/.post_reset as long as
 *	the driver presents. It is set 0 along with @updown in dev_stop().
 *
 * @error_recovery: flag to denote if we are ready to take an error recovery.
 *	0 for ready to take an error recovery; 1 for not ready. It is
 *	initialized to 1 while probe() since we don't tend to take any error
 *	recovery during probe(). It is decremented by 1 whenever dev_start()
 *	succeeds to indicate we are ready to take error recovery from now on.
 *	It is checked every time we wanna schedule an error recovery. If an
 *	error recovery is already in place (error_recovery was set 1), we
 *	should not schedule another one until the last one is done.
 */
struct i2400m {
	struct wimax_dev wimax_dev;	/* FIRST! See doc */

	unsigned updown:1;		/* Network device is up or down */
	unsigned boot_mode:1;		/* is the device in boot mode? */
	unsigned sboot:1;		/* signed or unsigned fw boot */
	unsigned ready:1;		/* Device comm infrastructure ready */
	unsigned rx_reorder:1;		/* RX reorder is enabled */
	u8 trace_msg_from_user;		/* echo rx msgs to 'trace' pipe */
					/* typed u8 so /sys/kernel/debug/u8 can tweak */
	enum i2400m_system_state state;
	wait_queue_head_t state_wq;	/* Woken up when on state updates */

	size_t bus_tx_block_size;
	size_t bus_tx_room_min;
	size_t bus_pl_size_max;
	unsigned bus_bm_retries;

	int (*bus_setup)(struct i2400m *);
	int (*bus_dev_start)(struct i2400m *);
	void (*bus_dev_stop)(struct i2400m *);
	void (*bus_release)(struct i2400m *);
	void (*bus_tx_kick)(struct i2400m *);
	int (*bus_reset)(struct i2400m *, enum i2400m_reset_type);
	ssize_t (*bus_bm_cmd_send)(struct i2400m *,
				   const struct i2400m_bootrom_header *,
				   size_t, int flags);
	ssize_t (*bus_bm_wait_for_ack)(struct i2400m *,
				       struct i2400m_bootrom_header *, size_t);
	const char **bus_fw_names;
	unsigned bus_bm_mac_addr_impaired:1;
	const struct i2400m_poke_table *bus_bm_pokes_table;

	spinlock_t tx_lock;		/* protect TX state */
	void *tx_buf;
	size_t tx_in, tx_out;
	struct i2400m_msg_hdr *tx_msg;
	size_t tx_sequence, tx_msg_size;
	/* TX stats */
	unsigned tx_pl_num, tx_pl_max, tx_pl_min,
		tx_num, tx_size_acc, tx_size_min, tx_size_max;

	/* RX stuff */
	/* protect RX state and rx_roq_refcount */
	spinlock_t rx_lock;
	unsigned rx_pl_num, rx_pl_max, rx_pl_min,
		rx_num, rx_size_acc, rx_size_min, rx_size_max;
	struct i2400m_roq *rx_roq;	/* access is refcounted */
	struct kref rx_roq_refcount;	/* refcount access to rx_roq */
	u8 src_mac_addr[ETH_HLEN];
	struct list_head rx_reports;	/* under rx_lock! */
	struct work_struct rx_report_ws;

	struct mutex msg_mutex;		/* serialize command execution */
	struct completion msg_completion;
	struct sk_buff *ack_skb;	/* protected by rx_lock */

	void *bm_ack_buf;		/* for receiving acks over USB */
	void *bm_cmd_buf;		/* for issuing commands over USB */

	struct workqueue_struct *work_queue;

	struct mutex init_mutex;	/* protect bringup seq */
	struct i2400m_reset_ctx *reset_ctx;	/* protected by init_mutex */

	struct work_struct wake_tx_ws;
	struct sk_buff *wake_tx_skb;

	struct work_struct reset_ws;
	const char *reset_reason;

	struct work_struct recovery_ws;

	struct dentry *debugfs_dentry;
	const char *fw_name;		/* name of the current firmware image */
	unsigned long fw_version;	/* version of the firmware interface */
	const struct i2400m_bcf_hdr **fw_hdrs;
	struct i2400m_fw *fw_cached;	/* protected by rx_lock */
	struct i2400m_barker_db *barker;

	struct notifier_block pm_notifier;

	/* counting bus reset retries in this boot */
	atomic_t bus_reset_retries;

	/* if the device is expected to be alive */
	unsigned alive;

	/* 0 if we are ready for error recovery; 1 if not ready  */
	atomic_t error_recovery;

};


/*
 * Bus-generic internal APIs
 * -------------------------
 */

static inline
struct i2400m *wimax_dev_to_i2400m(struct wimax_dev *wimax_dev)
{
	return container_of(wimax_dev, struct i2400m, wimax_dev);
}

static inline
struct i2400m *net_dev_to_i2400m(struct net_device *net_dev)
{
	return wimax_dev_to_i2400m(netdev_priv(net_dev));
}

/*
 * Boot mode support
 */

/**
 * i2400m_bm_cmd_flags - flags to i2400m_bm_cmd()
 *
 * @I2400M_BM_CMD_RAW: send the command block as-is, without doing any
 *     extra processing for adding CRC.
 */
enum i2400m_bm_cmd_flags {
	I2400M_BM_CMD_RAW	= 1 << 2,
};

/**
 * i2400m_bri - Boot-ROM indicators
 *
 * Flags for i2400m_bootrom_init() and i2400m_dev_bootstrap() [which
 * are passed from things like i2400m_setup()]. Can be combined with
 * |.
 *
 * @I2400M_BRI_SOFT: The device rebooted already and a reboot
 *     barker received, proceed directly to ack the boot sequence.
 * @I2400M_BRI_NO_REBOOT: Do not reboot the device and proceed
 *     directly to wait for a reboot barker from the device.
 * @I2400M_BRI_MAC_REINIT: We need to reinitialize the boot
 *     rom after reading the MAC address. This is quite a dirty hack,
 *     if you ask me -- the device requires the bootrom to be
 *     initialized after reading the MAC address.
 */
enum i2400m_bri {
	I2400M_BRI_SOFT       = 1 << 1,
	I2400M_BRI_NO_REBOOT  = 1 << 2,
	I2400M_BRI_MAC_REINIT = 1 << 3,
};

extern void i2400m_bm_cmd_prepare(struct i2400m_bootrom_header *);
extern int i2400m_dev_bootstrap(struct i2400m *, enum i2400m_bri);
extern int i2400m_read_mac_addr(struct i2400m *);
extern int i2400m_bootrom_init(struct i2400m *, enum i2400m_bri);
extern int i2400m_is_boot_barker(struct i2400m *, const void *, size_t);
static inline
int i2400m_is_d2h_barker(const void *buf)
{
	const __le32 *barker = buf;
	return le32_to_cpu(*barker) == I2400M_D2H_MSG_BARKER;
}
extern void i2400m_unknown_barker(struct i2400m *, const void *, size_t);

/* Make/grok boot-rom header commands */

static inline
__le32 i2400m_brh_command(enum i2400m_brh_opcode opcode, unsigned use_checksum,
			  unsigned direct_access)
{
	return cpu_to_le32(
		I2400M_BRH_SIGNATURE
		| (direct_access ? I2400M_BRH_DIRECT_ACCESS : 0)
		| I2400M_BRH_RESPONSE_REQUIRED /* response always required */
		| (use_checksum ? I2400M_BRH_USE_CHECKSUM : 0)
		| (opcode & I2400M_BRH_OPCODE_MASK));
}

static inline
void i2400m_brh_set_opcode(struct i2400m_bootrom_header *hdr,
			   enum i2400m_brh_opcode opcode)
{
	hdr->command = cpu_to_le32(
		(le32_to_cpu(hdr->command) & ~I2400M_BRH_OPCODE_MASK)
		| (opcode & I2400M_BRH_OPCODE_MASK));
}

static inline
unsigned i2400m_brh_get_opcode(const struct i2400m_bootrom_header *hdr)
{
	return le32_to_cpu(hdr->command) & I2400M_BRH_OPCODE_MASK;
}

static inline
unsigned i2400m_brh_get_response(const struct i2400m_bootrom_header *hdr)
{
	return (le32_to_cpu(hdr->command) & I2400M_BRH_RESPONSE_MASK)
		>> I2400M_BRH_RESPONSE_SHIFT;
}

static inline
unsigned i2400m_brh_get_use_checksum(const struct i2400m_bootrom_header *hdr)
{
	return le32_to_cpu(hdr->command) & I2400M_BRH_USE_CHECKSUM;
}

static inline
unsigned i2400m_brh_get_response_required(
	const struct i2400m_bootrom_header *hdr)
{
	return le32_to_cpu(hdr->command) & I2400M_BRH_RESPONSE_REQUIRED;
}

static inline
unsigned i2400m_brh_get_direct_access(const struct i2400m_bootrom_header *hdr)
{
	return le32_to_cpu(hdr->command) & I2400M_BRH_DIRECT_ACCESS;
}

static inline
unsigned i2400m_brh_get_signature(const struct i2400m_bootrom_header *hdr)
{
	return (le32_to_cpu(hdr->command) & I2400M_BRH_SIGNATURE_MASK)
		>> I2400M_BRH_SIGNATURE_SHIFT;
}


/*
 * Driver / device setup and internal functions
 */
extern void i2400m_init(struct i2400m *);
extern int i2400m_reset(struct i2400m *, enum i2400m_reset_type);
extern void i2400m_netdev_setup(struct net_device *net_dev);
extern int i2400m_sysfs_setup(struct device_driver *);
extern void i2400m_sysfs_release(struct device_driver *);
extern int i2400m_tx_setup(struct i2400m *);
extern void i2400m_wake_tx_work(struct work_struct *);
extern void i2400m_tx_release(struct i2400m *);

extern int i2400m_rx_setup(struct i2400m *);
extern void i2400m_rx_release(struct i2400m *);

extern void i2400m_fw_cache(struct i2400m *);
extern void i2400m_fw_uncache(struct i2400m *);

extern void i2400m_net_rx(struct i2400m *, struct sk_buff *, unsigned,
			  const void *, int);
extern void i2400m_net_erx(struct i2400m *, struct sk_buff *,
			   enum i2400m_cs);
extern void i2400m_net_wake_stop(struct i2400m *);
enum i2400m_pt;
extern int i2400m_tx(struct i2400m *, const void *, size_t, enum i2400m_pt);

#ifdef CONFIG_DEBUG_FS
extern int i2400m_debugfs_add(struct i2400m *);
extern void i2400m_debugfs_rm(struct i2400m *);
#else
static inline int i2400m_debugfs_add(struct i2400m *i2400m)
{
	return 0;
}
static inline void i2400m_debugfs_rm(struct i2400m *i2400m) {}
#endif

/* Initialize/shutdown the device */
extern int i2400m_dev_initialize(struct i2400m *);
extern void i2400m_dev_shutdown(struct i2400m *);

extern struct attribute_group i2400m_dev_attr_group;


/* HDI message's payload description handling */

static inline
size_t i2400m_pld_size(const struct i2400m_pld *pld)
{
	return I2400M_PLD_SIZE_MASK & le32_to_cpu(pld->val);
}

static inline
enum i2400m_pt i2400m_pld_type(const struct i2400m_pld *pld)
{
	return (I2400M_PLD_TYPE_MASK & le32_to_cpu(pld->val))
		>> I2400M_PLD_TYPE_SHIFT;
}

static inline
void i2400m_pld_set(struct i2400m_pld *pld, size_t size,
		    enum i2400m_pt type)
{
	pld->val = cpu_to_le32(
		((type << I2400M_PLD_TYPE_SHIFT) & I2400M_PLD_TYPE_MASK)
		|  (size & I2400M_PLD_SIZE_MASK));
}


/*
 * API for the bus-specific drivers
 * --------------------------------
 */

static inline
struct i2400m *i2400m_get(struct i2400m *i2400m)
{
	dev_hold(i2400m->wimax_dev.net_dev);
	return i2400m;
}

static inline
void i2400m_put(struct i2400m *i2400m)
{
	dev_put(i2400m->wimax_dev.net_dev);
}

extern int i2400m_dev_reset_handle(struct i2400m *, const char *);
extern int i2400m_pre_reset(struct i2400m *);
extern int i2400m_post_reset(struct i2400m *);
extern void i2400m_error_recovery(struct i2400m *);

/*
 * _setup()/_release() are called by the probe/disconnect functions of
 * the bus-specific drivers.
 */
extern int i2400m_setup(struct i2400m *, enum i2400m_bri bm_flags);
extern void i2400m_release(struct i2400m *);

extern int i2400m_rx(struct i2400m *, struct sk_buff *);
extern struct i2400m_msg_hdr *i2400m_tx_msg_get(struct i2400m *, size_t *);
extern void i2400m_tx_msg_sent(struct i2400m *);


/*
 * Utility functions
 */

static inline
struct device *i2400m_dev(struct i2400m *i2400m)
{
	return i2400m->wimax_dev.net_dev->dev.parent;
}

extern int i2400m_msg_check_status(const struct i2400m_l3l4_hdr *,
				   char *, size_t);
extern int i2400m_msg_size_check(struct i2400m *,
				 const struct i2400m_l3l4_hdr *, size_t);
extern struct sk_buff *i2400m_msg_to_dev(struct i2400m *, const void *, size_t);
extern void i2400m_msg_to_dev_cancel_wait(struct i2400m *, int);
extern void i2400m_report_hook(struct i2400m *,
			       const struct i2400m_l3l4_hdr *, size_t);
extern void i2400m_report_hook_work(struct work_struct *);
extern int i2400m_cmd_enter_powersave(struct i2400m *);
extern int i2400m_cmd_exit_idle(struct i2400m *);
extern struct sk_buff *i2400m_get_device_info(struct i2400m *);
extern int i2400m_firmware_check(struct i2400m *);
extern int i2400m_set_idle_timeout(struct i2400m *, unsigned);

static inline
struct usb_endpoint_descriptor *usb_get_epd(struct usb_interface *iface, int ep)
{
	return &iface->cur_altsetting->endpoint[ep].desc;
}

extern int i2400m_op_rfkill_sw_toggle(struct wimax_dev *,
				      enum wimax_rf_state);
extern void i2400m_report_tlv_rf_switches_status(
	struct i2400m *, const struct i2400m_tlv_rf_switches_status *);

/*
 * Helpers for firmware backwards compatibility
 *
 * As we aim to support at least the firmware version that was
 * released with the previous kernel/driver release, some code will be
 * conditionally executed depending on the firmware version. On each
 * release, the code to support fw releases past the last two ones
 * will be purged.
 *
 * By making it depend on this macros, it is easier to keep it a tab
 * on what has to go and what not.
 */
static inline
unsigned i2400m_le_v1_3(struct i2400m *i2400m)
{
	/* running fw is lower or v1.3 */
	return i2400m->fw_version <= 0x00090001;
}

static inline
unsigned i2400m_ge_v1_4(struct i2400m *i2400m)
{
	/* running fw is higher or v1.4 */
	return i2400m->fw_version >= 0x00090002;
}


/*
 * Do a millisecond-sleep for allowing wireshark to dump all the data
 * packets. Used only for debugging.
 */
static inline
void __i2400m_msleep(unsigned ms)
{
#if 1
#else
	msleep(ms);
#endif
}


/* module initialization helpers */
extern int i2400m_barker_db_init(const char *);
extern void i2400m_barker_db_exit(void);



#endif /* #ifndef __I2400M_H__ */