summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/ath/ath10k/ahb.c
blob: acec16b9cf49051c6bd4ee3246bf42ef42794d2f (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
/*
 * Copyright (c) 2016 Qualcomm Atheros, Inc. All rights reserved.
 * Copyright (c) 2015 The Linux Foundation. All rights reserved.
 *
 * 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.
 */
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include "core.h"
#include "debug.h"
#include "pci.h"
#include "ahb.h"

static const struct of_device_id ath10k_ahb_of_match[] = {
	{ .compatible = "qcom,ipq4019-wifi",
	  .data = (void *)ATH10K_HW_QCA4019
	},
	{ }
};

MODULE_DEVICE_TABLE(of, ath10k_ahb_of_match);

static inline struct ath10k_ahb *ath10k_ahb_priv(struct ath10k *ar)
{
	return &((struct ath10k_pci *)ar->drv_priv)->ahb[0];
}

static void ath10k_ahb_write32(struct ath10k *ar, u32 offset, u32 value)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	iowrite32(value, ar_ahb->mem + offset);
}

static u32 ath10k_ahb_read32(struct ath10k *ar, u32 offset)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	return ioread32(ar_ahb->mem + offset);
}

static u32 ath10k_ahb_gcc_read32(struct ath10k *ar, u32 offset)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	return ioread32(ar_ahb->gcc_mem + offset);
}

static void ath10k_ahb_tcsr_write32(struct ath10k *ar, u32 offset, u32 value)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	iowrite32(value, ar_ahb->tcsr_mem + offset);
}

static u32 ath10k_ahb_tcsr_read32(struct ath10k *ar, u32 offset)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	return ioread32(ar_ahb->tcsr_mem + offset);
}

static u32 ath10k_ahb_soc_read32(struct ath10k *ar, u32 addr)
{
	return ath10k_ahb_read32(ar, RTC_SOC_BASE_ADDRESS + addr);
}

static int ath10k_ahb_get_num_banks(struct ath10k *ar)
{
	if (ar->hw_rev == ATH10K_HW_QCA4019)
		return 1;

	ath10k_warn(ar, "unknown number of banks, assuming 1\n");
	return 1;
}

static int ath10k_ahb_clock_init(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
	struct device *dev;
	int ret;

	dev = &ar_ahb->pdev->dev;

	ar_ahb->cmd_clk = clk_get(dev, "wifi_wcss_cmd");
	if (IS_ERR_OR_NULL(ar_ahb->cmd_clk)) {
		ath10k_err(ar, "failed to get cmd clk: %ld\n",
			   PTR_ERR(ar_ahb->cmd_clk));
		ret = ar_ahb->cmd_clk ? PTR_ERR(ar_ahb->cmd_clk) : -ENODEV;
		goto out;
	}

	ar_ahb->ref_clk = clk_get(dev, "wifi_wcss_ref");
	if (IS_ERR_OR_NULL(ar_ahb->ref_clk)) {
		ath10k_err(ar, "failed to get ref clk: %ld\n",
			   PTR_ERR(ar_ahb->ref_clk));
		ret = ar_ahb->ref_clk ? PTR_ERR(ar_ahb->ref_clk) : -ENODEV;
		goto err_cmd_clk_put;
	}

	ar_ahb->rtc_clk = clk_get(dev, "wifi_wcss_rtc");
	if (IS_ERR_OR_NULL(ar_ahb->rtc_clk)) {
		ath10k_err(ar, "failed to get rtc clk: %ld\n",
			   PTR_ERR(ar_ahb->rtc_clk));
		ret = ar_ahb->rtc_clk ? PTR_ERR(ar_ahb->rtc_clk) : -ENODEV;
		goto err_ref_clk_put;
	}

	return 0;

err_ref_clk_put:
	clk_put(ar_ahb->ref_clk);

err_cmd_clk_put:
	clk_put(ar_ahb->cmd_clk);

out:
	return ret;
}

static void ath10k_ahb_clock_deinit(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	if (!IS_ERR_OR_NULL(ar_ahb->cmd_clk))
		clk_put(ar_ahb->cmd_clk);

	if (!IS_ERR_OR_NULL(ar_ahb->ref_clk))
		clk_put(ar_ahb->ref_clk);

	if (!IS_ERR_OR_NULL(ar_ahb->rtc_clk))
		clk_put(ar_ahb->rtc_clk);

	ar_ahb->cmd_clk = NULL;
	ar_ahb->ref_clk = NULL;
	ar_ahb->rtc_clk = NULL;
}

static int ath10k_ahb_clock_enable(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
	struct device *dev;
	int ret;

	dev = &ar_ahb->pdev->dev;

	if (IS_ERR_OR_NULL(ar_ahb->cmd_clk) ||
	    IS_ERR_OR_NULL(ar_ahb->ref_clk) ||
	    IS_ERR_OR_NULL(ar_ahb->rtc_clk)) {
		ath10k_err(ar, "clock(s) is/are not initialized\n");
		ret = -EIO;
		goto out;
	}

	ret = clk_prepare_enable(ar_ahb->cmd_clk);
	if (ret) {
		ath10k_err(ar, "failed to enable cmd clk: %d\n", ret);
		goto out;
	}

	ret = clk_prepare_enable(ar_ahb->ref_clk);
	if (ret) {
		ath10k_err(ar, "failed to enable ref clk: %d\n", ret);
		goto err_cmd_clk_disable;
	}

	ret = clk_prepare_enable(ar_ahb->rtc_clk);
	if (ret) {
		ath10k_err(ar, "failed to enable rtc clk: %d\n", ret);
		goto err_ref_clk_disable;
	}

	return 0;

err_ref_clk_disable:
	clk_disable_unprepare(ar_ahb->ref_clk);

err_cmd_clk_disable:
	clk_disable_unprepare(ar_ahb->cmd_clk);

out:
	return ret;
}

static void ath10k_ahb_clock_disable(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	if (!IS_ERR_OR_NULL(ar_ahb->cmd_clk))
		clk_disable_unprepare(ar_ahb->cmd_clk);

	if (!IS_ERR_OR_NULL(ar_ahb->ref_clk))
		clk_disable_unprepare(ar_ahb->ref_clk);

	if (!IS_ERR_OR_NULL(ar_ahb->rtc_clk))
		clk_disable_unprepare(ar_ahb->rtc_clk);
}

static int ath10k_ahb_rst_ctrl_init(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
	struct device *dev;
	int ret;

	dev = &ar_ahb->pdev->dev;

	ar_ahb->core_cold_rst = reset_control_get(dev, "wifi_core_cold");
	if (IS_ERR_OR_NULL(ar_ahb->core_cold_rst)) {
		ath10k_err(ar, "failed to get core cold rst ctrl: %ld\n",
			   PTR_ERR(ar_ahb->core_cold_rst));
		ret = ar_ahb->core_cold_rst ?
			PTR_ERR(ar_ahb->core_cold_rst) : -ENODEV;
		goto out;
	}

	ar_ahb->radio_cold_rst = reset_control_get(dev, "wifi_radio_cold");
	if (IS_ERR_OR_NULL(ar_ahb->radio_cold_rst)) {
		ath10k_err(ar, "failed to get radio cold rst ctrl: %ld\n",
			   PTR_ERR(ar_ahb->radio_cold_rst));
		ret = ar_ahb->radio_cold_rst ?
			PTR_ERR(ar_ahb->radio_cold_rst) : -ENODEV;
		goto err_core_cold_rst_put;
	}

	ar_ahb->radio_warm_rst = reset_control_get(dev, "wifi_radio_warm");
	if (IS_ERR_OR_NULL(ar_ahb->radio_warm_rst)) {
		ath10k_err(ar, "failed to get radio warm rst ctrl: %ld\n",
			   PTR_ERR(ar_ahb->radio_warm_rst));
		ret = ar_ahb->radio_warm_rst ?
			PTR_ERR(ar_ahb->radio_warm_rst) : -ENODEV;
		goto err_radio_cold_rst_put;
	}

	ar_ahb->radio_srif_rst = reset_control_get(dev, "wifi_radio_srif");
	if (IS_ERR_OR_NULL(ar_ahb->radio_srif_rst)) {
		ath10k_err(ar, "failed to get radio srif rst ctrl: %ld\n",
			   PTR_ERR(ar_ahb->radio_srif_rst));
		ret = ar_ahb->radio_srif_rst ?
			PTR_ERR(ar_ahb->radio_srif_rst) : -ENODEV;
		goto err_radio_warm_rst_put;
	}

	ar_ahb->cpu_init_rst = reset_control_get(dev, "wifi_cpu_init");
	if (IS_ERR_OR_NULL(ar_ahb->cpu_init_rst)) {
		ath10k_err(ar, "failed to get cpu init rst ctrl: %ld\n",
			   PTR_ERR(ar_ahb->cpu_init_rst));
		ret = ar_ahb->cpu_init_rst ?
			PTR_ERR(ar_ahb->cpu_init_rst) : -ENODEV;
		goto err_radio_srif_rst_put;
	}

	return 0;

err_radio_srif_rst_put:
	reset_control_put(ar_ahb->radio_srif_rst);

err_radio_warm_rst_put:
	reset_control_put(ar_ahb->radio_warm_rst);

err_radio_cold_rst_put:
	reset_control_put(ar_ahb->radio_cold_rst);

err_core_cold_rst_put:
	reset_control_put(ar_ahb->core_cold_rst);

out:
	return ret;
}

static void ath10k_ahb_rst_ctrl_deinit(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	if (!IS_ERR_OR_NULL(ar_ahb->core_cold_rst))
		reset_control_put(ar_ahb->core_cold_rst);

	if (!IS_ERR_OR_NULL(ar_ahb->radio_cold_rst))
		reset_control_put(ar_ahb->radio_cold_rst);

	if (!IS_ERR_OR_NULL(ar_ahb->radio_warm_rst))
		reset_control_put(ar_ahb->radio_warm_rst);

	if (!IS_ERR_OR_NULL(ar_ahb->radio_srif_rst))
		reset_control_put(ar_ahb->radio_srif_rst);

	if (!IS_ERR_OR_NULL(ar_ahb->cpu_init_rst))
		reset_control_put(ar_ahb->cpu_init_rst);

	ar_ahb->core_cold_rst = NULL;
	ar_ahb->radio_cold_rst = NULL;
	ar_ahb->radio_warm_rst = NULL;
	ar_ahb->radio_srif_rst = NULL;
	ar_ahb->cpu_init_rst = NULL;
}

static int ath10k_ahb_release_reset(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
	int ret;

	if (IS_ERR_OR_NULL(ar_ahb->radio_cold_rst) ||
	    IS_ERR_OR_NULL(ar_ahb->radio_warm_rst) ||
	    IS_ERR_OR_NULL(ar_ahb->radio_srif_rst) ||
	    IS_ERR_OR_NULL(ar_ahb->cpu_init_rst)) {
		ath10k_err(ar, "rst ctrl(s) is/are not initialized\n");
		return -EINVAL;
	}

	ret = reset_control_deassert(ar_ahb->radio_cold_rst);
	if (ret) {
		ath10k_err(ar, "failed to deassert radio cold rst: %d\n", ret);
		return ret;
	}

	ret = reset_control_deassert(ar_ahb->radio_warm_rst);
	if (ret) {
		ath10k_err(ar, "failed to deassert radio warm rst: %d\n", ret);
		return ret;
	}

	ret = reset_control_deassert(ar_ahb->radio_srif_rst);
	if (ret) {
		ath10k_err(ar, "failed to deassert radio srif rst: %d\n", ret);
		return ret;
	}

	ret = reset_control_deassert(ar_ahb->cpu_init_rst);
	if (ret) {
		ath10k_err(ar, "failed to deassert cpu init rst: %d\n", ret);
		return ret;
	}

	return 0;
}

static void ath10k_ahb_halt_axi_bus(struct ath10k *ar, u32 haltreq_reg,
				    u32 haltack_reg)
{
	unsigned long timeout;
	u32 val;

	/* Issue halt axi bus request */
	val = ath10k_ahb_tcsr_read32(ar, haltreq_reg);
	val |= AHB_AXI_BUS_HALT_REQ;
	ath10k_ahb_tcsr_write32(ar, haltreq_reg, val);

	/* Wait for axi bus halted ack */
	timeout = jiffies + msecs_to_jiffies(ATH10K_AHB_AXI_BUS_HALT_TIMEOUT);
	do {
		val = ath10k_ahb_tcsr_read32(ar, haltack_reg);
		if (val & AHB_AXI_BUS_HALT_ACK)
			break;

		mdelay(1);
	} while (time_before(jiffies, timeout));

	if (!(val & AHB_AXI_BUS_HALT_ACK)) {
		ath10k_err(ar, "failed to halt axi bus: %d\n", val);
		return;
	}

	ath10k_dbg(ar, ATH10K_DBG_AHB, "axi bus halted\n");
}

static void ath10k_ahb_halt_chip(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
	u32 core_id, glb_cfg_reg, haltreq_reg, haltack_reg;
	u32 val;
	int ret;

	if (IS_ERR_OR_NULL(ar_ahb->core_cold_rst) ||
	    IS_ERR_OR_NULL(ar_ahb->radio_cold_rst) ||
	    IS_ERR_OR_NULL(ar_ahb->radio_warm_rst) ||
	    IS_ERR_OR_NULL(ar_ahb->radio_srif_rst) ||
	    IS_ERR_OR_NULL(ar_ahb->cpu_init_rst)) {
		ath10k_err(ar, "rst ctrl(s) is/are not initialized\n");
		return;
	}

	core_id = ath10k_ahb_read32(ar, ATH10K_AHB_WLAN_CORE_ID_REG);

	switch (core_id) {
	case 0:
		glb_cfg_reg = ATH10K_AHB_TCSR_WIFI0_GLB_CFG;
		haltreq_reg = ATH10K_AHB_TCSR_WCSS0_HALTREQ;
		haltack_reg = ATH10K_AHB_TCSR_WCSS0_HALTACK;
		break;
	case 1:
		glb_cfg_reg = ATH10K_AHB_TCSR_WIFI1_GLB_CFG;
		haltreq_reg = ATH10K_AHB_TCSR_WCSS1_HALTREQ;
		haltack_reg = ATH10K_AHB_TCSR_WCSS1_HALTACK;
		break;
	default:
		ath10k_err(ar, "invalid core id %d found, skipping reset sequence\n",
			   core_id);
		return;
	}

	ath10k_ahb_halt_axi_bus(ar, haltreq_reg, haltack_reg);

	val = ath10k_ahb_tcsr_read32(ar, glb_cfg_reg);
	val |= TCSR_WIFIX_GLB_CFG_DISABLE_CORE_CLK;
	ath10k_ahb_tcsr_write32(ar, glb_cfg_reg, val);

	ret = reset_control_assert(ar_ahb->core_cold_rst);
	if (ret)
		ath10k_err(ar, "failed to assert core cold rst: %d\n", ret);
	msleep(1);

	ret = reset_control_assert(ar_ahb->radio_cold_rst);
	if (ret)
		ath10k_err(ar, "failed to assert radio cold rst: %d\n", ret);
	msleep(1);

	ret = reset_control_assert(ar_ahb->radio_warm_rst);
	if (ret)
		ath10k_err(ar, "failed to assert radio warm rst: %d\n", ret);
	msleep(1);

	ret = reset_control_assert(ar_ahb->radio_srif_rst);
	if (ret)
		ath10k_err(ar, "failed to assert radio srif rst: %d\n", ret);
	msleep(1);

	ret = reset_control_assert(ar_ahb->cpu_init_rst);
	if (ret)
		ath10k_err(ar, "failed to assert cpu init rst: %d\n", ret);
	msleep(10);

	/* Clear halt req and core clock disable req before
	 * deasserting wifi core reset.
	 */
	val = ath10k_ahb_tcsr_read32(ar, haltreq_reg);
	val &= ~AHB_AXI_BUS_HALT_REQ;
	ath10k_ahb_tcsr_write32(ar, haltreq_reg, val);

	val = ath10k_ahb_tcsr_read32(ar, glb_cfg_reg);
	val &= ~TCSR_WIFIX_GLB_CFG_DISABLE_CORE_CLK;
	ath10k_ahb_tcsr_write32(ar, glb_cfg_reg, val);

	ret = reset_control_deassert(ar_ahb->core_cold_rst);
	if (ret)
		ath10k_err(ar, "failed to deassert core cold rst: %d\n", ret);

	ath10k_dbg(ar, ATH10K_DBG_AHB, "core %d reset done\n", core_id);
}

static irqreturn_t ath10k_ahb_interrupt_handler(int irq, void *arg)
{
	struct ath10k *ar = arg;
	struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);

	if (!ath10k_pci_irq_pending(ar))
		return IRQ_NONE;

	ath10k_pci_disable_and_clear_legacy_irq(ar);
	tasklet_schedule(&ar_pci->intr_tq);

	return IRQ_HANDLED;
}

static int ath10k_ahb_request_irq_legacy(struct ath10k *ar)
{
	struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
	int ret;

	ret = request_irq(ar_ahb->irq,
			  ath10k_ahb_interrupt_handler,
			  IRQF_SHARED, "ath10k_ahb", ar);
	if (ret) {
		ath10k_warn(ar, "failed to request legacy irq %d: %d\n",
			    ar_ahb->irq, ret);
		return ret;
	}
	ar_pci->oper_irq_mode = ATH10K_PCI_IRQ_LEGACY;

	return 0;
}

static void ath10k_ahb_release_irq_legacy(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	free_irq(ar_ahb->irq, ar);
}

static void ath10k_ahb_irq_disable(struct ath10k *ar)
{
	ath10k_ce_disable_interrupts(ar);
	ath10k_pci_disable_and_clear_legacy_irq(ar);
}

static int ath10k_ahb_resource_init(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
	struct platform_device *pdev;
	struct device *dev;
	struct resource *res;
	int ret;

	pdev = ar_ahb->pdev;
	dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ath10k_err(ar, "failed to get memory resource\n");
		ret = -ENXIO;
		goto out;
	}

	ar_ahb->mem = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ar_ahb->mem)) {
		ath10k_err(ar, "mem ioremap error\n");
		ret = PTR_ERR(ar_ahb->mem);
		goto out;
	}

	ar_ahb->mem_len = resource_size(res);

	ar_ahb->gcc_mem = ioremap_nocache(ATH10K_GCC_REG_BASE,
					  ATH10K_GCC_REG_SIZE);
	if (!ar_ahb->gcc_mem) {
		ath10k_err(ar, "gcc mem ioremap error\n");
		ret = -ENOMEM;
		goto err_mem_unmap;
	}

	ar_ahb->tcsr_mem = ioremap_nocache(ATH10K_TCSR_REG_BASE,
					   ATH10K_TCSR_REG_SIZE);
	if (!ar_ahb->tcsr_mem) {
		ath10k_err(ar, "tcsr mem ioremap error\n");
		ret = -ENOMEM;
		goto err_gcc_mem_unmap;
	}

	ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
	if (ret) {
		ath10k_err(ar, "failed to set 32-bit dma mask: %d\n", ret);
		goto err_tcsr_mem_unmap;
	}

	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
	if (ret) {
		ath10k_err(ar, "failed to set 32-bit consistent dma: %d\n",
			   ret);
		goto err_tcsr_mem_unmap;
	}

	ret = ath10k_ahb_clock_init(ar);
	if (ret)
		goto err_tcsr_mem_unmap;

	ret = ath10k_ahb_rst_ctrl_init(ar);
	if (ret)
		goto err_clock_deinit;

	ar_ahb->irq = platform_get_irq_byname(pdev, "legacy");
	if (ar_ahb->irq < 0) {
		ath10k_err(ar, "failed to get irq number: %d\n", ar_ahb->irq);
		goto err_clock_deinit;
	}

	ath10k_dbg(ar, ATH10K_DBG_BOOT, "irq: %d\n", ar_ahb->irq);

	ath10k_dbg(ar, ATH10K_DBG_BOOT, "mem: 0x%p mem_len: %lu gcc mem: 0x%p tcsr_mem: 0x%p\n",
		   ar_ahb->mem, ar_ahb->mem_len,
		   ar_ahb->gcc_mem, ar_ahb->tcsr_mem);
	return 0;

err_clock_deinit:
	ath10k_ahb_clock_deinit(ar);

err_tcsr_mem_unmap:
	iounmap(ar_ahb->tcsr_mem);

err_gcc_mem_unmap:
	ar_ahb->tcsr_mem = NULL;
	iounmap(ar_ahb->gcc_mem);

err_mem_unmap:
	ar_ahb->gcc_mem = NULL;
	devm_iounmap(&pdev->dev, ar_ahb->mem);

out:
	ar_ahb->mem = NULL;
	return ret;
}

static void ath10k_ahb_resource_deinit(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
	struct device *dev;

	dev = &ar_ahb->pdev->dev;

	if (ar_ahb->mem)
		devm_iounmap(dev, ar_ahb->mem);

	if (ar_ahb->gcc_mem)
		iounmap(ar_ahb->gcc_mem);

	if (ar_ahb->tcsr_mem)
		iounmap(ar_ahb->tcsr_mem);

	ar_ahb->mem = NULL;
	ar_ahb->gcc_mem = NULL;
	ar_ahb->tcsr_mem = NULL;

	ath10k_ahb_clock_deinit(ar);
	ath10k_ahb_rst_ctrl_deinit(ar);
}

static int ath10k_ahb_prepare_device(struct ath10k *ar)
{
	u32 val;
	int ret;

	ret = ath10k_ahb_clock_enable(ar);
	if (ret) {
		ath10k_err(ar, "failed to enable clocks\n");
		return ret;
	}

	/* Clock for the target is supplied from outside of target (ie,
	 * external clock module controlled by the host). Target needs
	 * to know what frequency target cpu is configured which is needed
	 * for target internal use. Read target cpu frequency info from
	 * gcc register and write into target's scratch register where
	 * target expects this information.
	 */
	val = ath10k_ahb_gcc_read32(ar, ATH10K_AHB_GCC_FEPLL_PLL_DIV);
	ath10k_ahb_write32(ar, ATH10K_AHB_WIFI_SCRATCH_5_REG, val);

	ret = ath10k_ahb_release_reset(ar);
	if (ret)
		goto err_clk_disable;

	ath10k_ahb_irq_disable(ar);

	ath10k_ahb_write32(ar, FW_INDICATOR_ADDRESS, FW_IND_HOST_READY);

	ret = ath10k_pci_wait_for_target_init(ar);
	if (ret)
		goto err_halt_chip;

	return 0;

err_halt_chip:
	ath10k_ahb_halt_chip(ar);

err_clk_disable:
	ath10k_ahb_clock_disable(ar);

	return ret;
}

static int ath10k_ahb_chip_reset(struct ath10k *ar)
{
	int ret;

	ath10k_ahb_halt_chip(ar);
	ath10k_ahb_clock_disable(ar);

	ret = ath10k_ahb_prepare_device(ar);
	if (ret)
		return ret;

	return 0;
}

static int ath10k_ahb_wake_target_cpu(struct ath10k *ar)
{
	u32 addr, val;

	addr = SOC_CORE_BASE_ADDRESS | CORE_CTRL_ADDRESS;
	val = ath10k_ahb_read32(ar, addr);
	val |= ATH10K_AHB_CORE_CTRL_CPU_INTR_MASK;
	ath10k_ahb_write32(ar, addr, val);

	return 0;
}

static int ath10k_ahb_hif_start(struct ath10k *ar)
{
	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot ahb hif start\n");

	ath10k_ce_enable_interrupts(ar);
	ath10k_pci_enable_legacy_irq(ar);

	ath10k_pci_rx_post(ar);

	return 0;
}

static void ath10k_ahb_hif_stop(struct ath10k *ar)
{
	struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);

	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot ahb hif stop\n");

	ath10k_ahb_irq_disable(ar);
	synchronize_irq(ar_ahb->irq);

	ath10k_pci_flush(ar);
}

static int ath10k_ahb_hif_power_up(struct ath10k *ar)
{
	int ret;

	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot ahb hif power up\n");

	ret = ath10k_ahb_chip_reset(ar);
	if (ret) {
		ath10k_err(ar, "failed to reset chip: %d\n", ret);
		goto out;
	}

	ret = ath10k_pci_init_pipes(ar);
	if (ret) {
		ath10k_err(ar, "failed to initialize CE: %d\n", ret);
		goto out;
	}

	ret = ath10k_pci_init_config(ar);
	if (ret) {
		ath10k_err(ar, "failed to setup init config: %d\n", ret);
		goto err_ce_deinit;
	}

	ret = ath10k_ahb_wake_target_cpu(ar);
	if (ret) {
		ath10k_err(ar, "could not wake up target CPU: %d\n", ret);
		goto err_ce_deinit;
	}

	return 0;

err_ce_deinit:
	ath10k_pci_ce_deinit(ar);
out:
	return ret;
}

static const struct ath10k_hif_ops ath10k_ahb_hif_ops = {
	.tx_sg                  = ath10k_pci_hif_tx_sg,
	.diag_read              = ath10k_pci_hif_diag_read,
	.diag_write             = ath10k_pci_diag_write_mem,
	.exchange_bmi_msg       = ath10k_pci_hif_exchange_bmi_msg,
	.start                  = ath10k_ahb_hif_start,
	.stop                   = ath10k_ahb_hif_stop,
	.map_service_to_pipe    = ath10k_pci_hif_map_service_to_pipe,
	.get_default_pipe       = ath10k_pci_hif_get_default_pipe,
	.send_complete_check    = ath10k_pci_hif_send_complete_check,
	.get_free_queue_number  = ath10k_pci_hif_get_free_queue_number,
	.power_up               = ath10k_ahb_hif_power_up,
	.power_down             = ath10k_pci_hif_power_down,
	.read32                 = ath10k_ahb_read32,
	.write32                = ath10k_ahb_write32,
};

static const struct ath10k_bus_ops ath10k_ahb_bus_ops = {
	.read32		= ath10k_ahb_read32,
	.write32	= ath10k_ahb_write32,
	.get_num_banks	= ath10k_ahb_get_num_banks,
};

static int ath10k_ahb_probe(struct platform_device *pdev)
{
	struct ath10k *ar;
	struct ath10k_ahb *ar_ahb;
	struct ath10k_pci *ar_pci;
	const struct of_device_id *of_id;
	enum ath10k_hw_rev hw_rev;
	size_t size;
	int ret;
	u32 chip_id;

	of_id = of_match_device(ath10k_ahb_of_match, &pdev->dev);
	if (!of_id) {
		dev_err(&pdev->dev, "failed to find matching device tree id\n");
		return -EINVAL;
	}

	hw_rev = (enum ath10k_hw_rev)of_id->data;

	size = sizeof(*ar_pci) + sizeof(*ar_ahb);
	ar = ath10k_core_create(size, &pdev->dev, ATH10K_BUS_AHB,
				hw_rev, &ath10k_ahb_hif_ops);
	if (!ar) {
		dev_err(&pdev->dev, "failed to allocate core\n");
		return -ENOMEM;
	}

	ath10k_dbg(ar, ATH10K_DBG_BOOT, "ahb probe\n");

	ar_pci = ath10k_pci_priv(ar);
	ar_ahb = ath10k_ahb_priv(ar);

	ar_ahb->pdev = pdev;
	platform_set_drvdata(pdev, ar);

	ret = ath10k_ahb_resource_init(ar);
	if (ret)
		goto err_core_destroy;

	ar->dev_id = 0;
	ar_pci->mem = ar_ahb->mem;
	ar_pci->mem_len = ar_ahb->mem_len;
	ar_pci->ar = ar;
	ar_pci->bus_ops = &ath10k_ahb_bus_ops;

	ret = ath10k_pci_setup_resource(ar);
	if (ret) {
		ath10k_err(ar, "failed to setup resource: %d\n", ret);
		goto err_resource_deinit;
	}

	ath10k_pci_init_irq_tasklets(ar);

	ret = ath10k_ahb_request_irq_legacy(ar);
	if (ret)
		goto err_free_pipes;

	ret = ath10k_ahb_prepare_device(ar);
	if (ret)
		goto err_free_irq;

	ath10k_pci_ce_deinit(ar);

	chip_id = ath10k_ahb_soc_read32(ar, SOC_CHIP_ID_ADDRESS);
	if (chip_id == 0xffffffff) {
		ath10k_err(ar, "failed to get chip id\n");
		goto err_halt_device;
	}

	ret = ath10k_core_register(ar, chip_id);
	if (ret) {
		ath10k_err(ar, "failed to register driver core: %d\n", ret);
		goto err_halt_device;
	}

	return 0;

err_halt_device:
	ath10k_ahb_halt_chip(ar);
	ath10k_ahb_clock_disable(ar);

err_free_irq:
	ath10k_ahb_release_irq_legacy(ar);

err_free_pipes:
	ath10k_pci_free_pipes(ar);

err_resource_deinit:
	ath10k_ahb_resource_deinit(ar);

err_core_destroy:
	ath10k_core_destroy(ar);
	platform_set_drvdata(pdev, NULL);

	return ret;
}

static int ath10k_ahb_remove(struct platform_device *pdev)
{
	struct ath10k *ar = platform_get_drvdata(pdev);
	struct ath10k_ahb *ar_ahb;

	if (!ar)
		return -EINVAL;

	ar_ahb = ath10k_ahb_priv(ar);

	if (!ar_ahb)
		return -EINVAL;

	ath10k_dbg(ar, ATH10K_DBG_AHB, "ahb remove\n");

	ath10k_core_unregister(ar);
	ath10k_ahb_irq_disable(ar);
	ath10k_ahb_release_irq_legacy(ar);
	ath10k_pci_release_resource(ar);
	ath10k_ahb_halt_chip(ar);
	ath10k_ahb_clock_disable(ar);
	ath10k_ahb_resource_deinit(ar);
	ath10k_core_destroy(ar);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver ath10k_ahb_driver = {
	.driver         = {
		.name   = "ath10k_ahb",
		.of_match_table = ath10k_ahb_of_match,
	},
	.probe  = ath10k_ahb_probe,
	.remove = ath10k_ahb_remove,
};

int ath10k_ahb_init(void)
{
	int ret;

	ret = platform_driver_register(&ath10k_ahb_driver);
	if (ret)
		printk(KERN_ERR "failed to register ath10k ahb driver: %d\n",
		       ret);
	return ret;
}

void ath10k_ahb_exit(void)
{
	platform_driver_unregister(&ath10k_ahb_driver);
}