summaryrefslogtreecommitdiff
path: root/arch/arm/mach-tegra/sleep-tegra30.S
blob: 5d8d13aeab937f0f9fd5348cd34cf5e638035769 (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
/*
 * Copyright (c) 2012, NVIDIA Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/linkage.h>

#include <soc/tegra/fuse.h>

#include <asm/asm-offsets.h>
#include <asm/assembler.h>
#include <asm/cache.h>

#include "flowctrl.h"
#include "irammap.h"
#include "sleep.h"

#define EMC_CFG				0xc
#define EMC_ADR_CFG			0x10
#define EMC_TIMING_CONTROL		0x28
#define EMC_REFRESH			0x70
#define EMC_NOP				0xdc
#define EMC_SELF_REF			0xe0
#define EMC_MRW				0xe8
#define EMC_FBIO_CFG5			0x104
#define EMC_AUTO_CAL_CONFIG		0x2a4
#define EMC_AUTO_CAL_INTERVAL		0x2a8
#define EMC_AUTO_CAL_STATUS		0x2ac
#define EMC_REQ_CTRL			0x2b0
#define EMC_CFG_DIG_DLL			0x2bc
#define EMC_EMC_STATUS			0x2b4
#define EMC_ZCAL_INTERVAL		0x2e0
#define EMC_ZQ_CAL			0x2ec
#define EMC_XM2VTTGENPADCTRL		0x310
#define EMC_XM2VTTGENPADCTRL2		0x314

#define PMC_CTRL			0x0
#define PMC_CTRL_SIDE_EFFECT_LP0 (1 << 14) /* enter LP0 when CPU pwr gated */

#define PMC_PLLP_WB0_OVERRIDE		0xf8
#define PMC_IO_DPD_REQ			0x1b8
#define PMC_IO_DPD_STATUS		0x1bc

#define CLK_RESET_CCLK_BURST		0x20
#define CLK_RESET_CCLK_DIVIDER		0x24
#define CLK_RESET_SCLK_BURST		0x28
#define CLK_RESET_SCLK_DIVIDER		0x2c

#define CLK_RESET_PLLC_BASE		0x80
#define CLK_RESET_PLLC_MISC		0x8c
#define CLK_RESET_PLLM_BASE		0x90
#define CLK_RESET_PLLM_MISC		0x9c
#define CLK_RESET_PLLP_BASE		0xa0
#define CLK_RESET_PLLP_MISC		0xac
#define CLK_RESET_PLLA_BASE		0xb0
#define CLK_RESET_PLLA_MISC		0xbc
#define CLK_RESET_PLLX_BASE		0xe0
#define CLK_RESET_PLLX_MISC		0xe4
#define CLK_RESET_PLLX_MISC3		0x518
#define CLK_RESET_PLLX_MISC3_IDDQ	3
#define CLK_RESET_PLLM_MISC_IDDQ	5
#define CLK_RESET_PLLC_MISC_IDDQ	26

#define CLK_RESET_CLK_SOURCE_MSELECT	0x3b4

#define MSELECT_CLKM			(0x3 << 30)

#define LOCK_DELAY 50 /* safety delay after lock is detected */

#define TEGRA30_POWER_HOTPLUG_SHUTDOWN	(1 << 27) /* Hotplug shutdown */

.macro emc_device_mask, rd, base
	ldr	\rd, [\base, #EMC_ADR_CFG]
	tst	\rd, #0x1
	moveq	\rd, #(0x1 << 8)		@ just 1 device
	movne	\rd, #(0x3 << 8)		@ 2 devices
.endm

.macro emc_timing_update, rd, base
	mov	\rd, #1
	str	\rd, [\base, #EMC_TIMING_CONTROL]
1001:
	ldr	\rd, [\base, #EMC_EMC_STATUS]
	tst	\rd, #(0x1<<23)	@ wait EMC_STATUS_TIMING_UPDATE_STALLED is clear
	bne	1001b
.endm

.macro pll_enable, rd, r_car_base, pll_base, pll_misc
	ldr	\rd, [\r_car_base, #\pll_base]
	tst	\rd, #(1 << 30)
	orreq	\rd, \rd, #(1 << 30)
	streq	\rd, [\r_car_base, #\pll_base]
	/* Enable lock detector */
	.if	\pll_misc
	ldr	\rd, [\r_car_base, #\pll_misc]
	bic	\rd, \rd, #(1 << 18)
	str	\rd, [\r_car_base, #\pll_misc]
	ldr	\rd, [\r_car_base, #\pll_misc]
	ldr	\rd, [\r_car_base, #\pll_misc]
	orr	\rd, \rd, #(1 << 18)
	str	\rd, [\r_car_base, #\pll_misc]
	.endif
.endm

.macro pll_locked, rd, r_car_base, pll_base
1:
	ldr	\rd, [\r_car_base, #\pll_base]
	tst	\rd, #(1 << 27)
	beq	1b
.endm

.macro pll_iddq_exit, rd, car, iddq, iddq_bit
	ldr	\rd, [\car, #\iddq]
	bic	\rd, \rd, #(1<<\iddq_bit)
	str	\rd, [\car, #\iddq]
.endm

.macro pll_iddq_entry, rd, car, iddq, iddq_bit
	ldr	\rd, [\car, #\iddq]
	orr	\rd, \rd, #(1<<\iddq_bit)
	str	\rd, [\car, #\iddq]
.endm

#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
/*
 * tegra30_hotplug_shutdown(void)
 *
 * Powergates the current CPU.
 * Should never return.
 */
ENTRY(tegra30_hotplug_shutdown)
	/* Powergate this CPU */
	mov	r0, #TEGRA30_POWER_HOTPLUG_SHUTDOWN
	bl	tegra30_cpu_shutdown
	ret	lr			@ should never get here
ENDPROC(tegra30_hotplug_shutdown)

/*
 * tegra30_cpu_shutdown(unsigned long flags)
 *
 * Puts the current CPU in wait-for-event mode on the flow controller
 * and powergates it -- flags (in R0) indicate the request type.
 *
 * r10 = SoC ID
 * corrupts r0-r4, r10-r12
 */
ENTRY(tegra30_cpu_shutdown)
	cpu_id	r3
	tegra_get_soc_id TEGRA_APB_MISC_VIRT, r10
	cmp	r10, #TEGRA30
	bne	_no_cpu0_chk	@ It's not Tegra30

	cmp	r3, #0
	reteq	lr		@ Must never be called for CPU 0
_no_cpu0_chk:

	ldr	r12, =TEGRA_FLOW_CTRL_VIRT
	cpu_to_csr_reg r1, r3
	add	r1, r1, r12	@ virtual CSR address for this CPU
	cpu_to_halt_reg r2, r3
	add	r2, r2, r12	@ virtual HALT_EVENTS address for this CPU

	/*
	 * Clear this CPU's "event" and "interrupt" flags and power gate
	 * it when halting but not before it is in the "WFE" state.
	 */
	movw	r12, \
		FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG | \
		FLOW_CTRL_CSR_ENABLE
	cmp	r10, #TEGRA30
	moveq	r4, #(1 << 4)			@ wfe bitmap
	movne	r4, #(1 << 8)			@ wfi bitmap
 ARM(	orr	r12, r12, r4, lsl r3	)
 THUMB(	lsl	r4, r4, r3		)
 THUMB(	orr	r12, r12, r4		)
	str	r12, [r1]

	/* Halt this CPU. */
	mov	r3, #0x400
delay_1:
	subs	r3, r3, #1			@ delay as a part of wfe war.
	bge	delay_1;
	cpsid	a				@ disable imprecise aborts.
	ldr	r3, [r1]			@ read CSR
	str	r3, [r1]			@ clear CSR

	tst	r0, #TEGRA30_POWER_HOTPLUG_SHUTDOWN
	beq	flow_ctrl_setting_for_lp2

	/* flow controller set up for hotplug */
	mov	r3, #FLOW_CTRL_WAITEVENT		@ For hotplug
	b	flow_ctrl_done
flow_ctrl_setting_for_lp2:
	/* flow controller set up for LP2 */
	cmp	r10, #TEGRA30
	moveq   r3, #FLOW_CTRL_WAIT_FOR_INTERRUPT	@ For LP2
	movne	r3, #FLOW_CTRL_WAITEVENT
	orrne	r3, r3, #FLOW_CTRL_HALT_GIC_IRQ
	orrne	r3, r3, #FLOW_CTRL_HALT_GIC_FIQ
flow_ctrl_done:
	cmp	r10, #TEGRA30
	str	r3, [r2]
	ldr	r0, [r2]
	b	wfe_war

__cpu_reset_again:
	dsb
	.align 5
	wfeeq					@ CPU should be power gated here
	wfine
wfe_war:
	b	__cpu_reset_again

	/*
	 * 38 nop's, which fills reset of wfe cache line and
	 * 4 more cachelines with nop
	 */
	.rept 38
	nop
	.endr
	b	.				@ should never get here

ENDPROC(tegra30_cpu_shutdown)
#endif

#ifdef CONFIG_PM_SLEEP
/*
 * tegra30_sleep_core_finish(unsigned long v2p)
 *
 * Enters suspend in LP0 or LP1 by turning off the MMU and jumping to
 * tegra30_tear_down_core in IRAM
 */
ENTRY(tegra30_sleep_core_finish)
	/* Flush, disable the L1 data cache and exit SMP */
	bl	tegra_disable_clean_inv_dcache

	/*
	 * Preload all the address literals that are needed for the
	 * CPU power-gating process, to avoid loading from SDRAM which
	 * are not supported once SDRAM is put into self-refresh.
	 * LP0 / LP1 use physical address, since the MMU needs to be
	 * disabled before putting SDRAM into self-refresh to avoid
	 * memory access due to page table walks.
	 */
	mov32	r4, TEGRA_PMC_BASE
	mov32	r5, TEGRA_CLK_RESET_BASE
	mov32	r6, TEGRA_FLOW_CTRL_BASE
	mov32	r7, TEGRA_TMRUS_BASE

	mov32	r3, tegra_shut_off_mmu
	add	r3, r3, r0

	mov32	r0, tegra30_tear_down_core
	mov32	r1, tegra30_iram_start
	sub	r0, r0, r1
	mov32	r1, TEGRA_IRAM_LPx_RESUME_AREA
	add	r0, r0, r1

	ret	r3
ENDPROC(tegra30_sleep_core_finish)

/*
 * tegra30_sleep_cpu_secondary_finish(unsigned long v2p)
 *
 * Enters LP2 on secondary CPU by exiting coherency and powergating the CPU.
 */
ENTRY(tegra30_sleep_cpu_secondary_finish)
	mov	r7, lr

	/* Flush and disable the L1 data cache */
	mov 	r0, #TEGRA_FLUSH_CACHE_LOUIS
	bl	tegra_disable_clean_inv_dcache

	/* Powergate this CPU. */
	mov	r0, #0                          @ power mode flags (!hotplug)
	bl	tegra30_cpu_shutdown
	mov	r0, #1                          @ never return here
	ret	r7
ENDPROC(tegra30_sleep_cpu_secondary_finish)

/*
 * tegra30_tear_down_cpu
 *
 * Switches the CPU to enter sleep.
 */
ENTRY(tegra30_tear_down_cpu)
	mov32	r6, TEGRA_FLOW_CTRL_BASE

	b	tegra30_enter_sleep
ENDPROC(tegra30_tear_down_cpu)

/* START OF ROUTINES COPIED TO IRAM */
	.align L1_CACHE_SHIFT
	.globl tegra30_iram_start
tegra30_iram_start:

/*
 * tegra30_lp1_reset
 *
 * reset vector for LP1 restore; copied into IRAM during suspend.
 * Brings the system back up to a safe staring point (SDRAM out of
 * self-refresh, PLLC, PLLM and PLLP reenabled, CPU running on PLLX,
 * system clock running on the same PLL that it suspended at), and
 * jumps to tegra_resume to restore virtual addressing.
 * The physical address of tegra_resume expected to be stored in
 * PMC_SCRATCH41.
 *
 * NOTE: THIS *MUST* BE RELOCATED TO TEGRA_IRAM_LPx_RESUME_AREA.
 */
ENTRY(tegra30_lp1_reset)
	/*
	 * The CPU and system bus are running at 32KHz and executing from
	 * IRAM when this code is executed; immediately switch to CLKM and
	 * enable PLLP, PLLM, PLLC, PLLA and PLLX.
	 */
	mov32	r0, TEGRA_CLK_RESET_BASE

	mov	r1, #(1 << 28)
	str	r1, [r0, #CLK_RESET_SCLK_BURST]
	str	r1, [r0, #CLK_RESET_CCLK_BURST]
	mov	r1, #0
	str	r1, [r0, #CLK_RESET_CCLK_DIVIDER]
	str	r1, [r0, #CLK_RESET_SCLK_DIVIDER]

	tegra_get_soc_id TEGRA_APB_MISC_BASE, r10
	cmp	r10, #TEGRA30
	beq	_no_pll_iddq_exit

	pll_iddq_exit r1, r0, CLK_RESET_PLLM_MISC, CLK_RESET_PLLM_MISC_IDDQ
	pll_iddq_exit r1, r0, CLK_RESET_PLLC_MISC, CLK_RESET_PLLC_MISC_IDDQ
	pll_iddq_exit r1, r0, CLK_RESET_PLLX_MISC3, CLK_RESET_PLLX_MISC3_IDDQ

	mov32	r7, TEGRA_TMRUS_BASE
	ldr	r1, [r7]
	add	r1, r1, #2
	wait_until r1, r7, r3

	/* enable PLLM via PMC */
	mov32	r2, TEGRA_PMC_BASE
	ldr	r1, [r2, #PMC_PLLP_WB0_OVERRIDE]
	orr	r1, r1, #(1 << 12)
	str	r1, [r2, #PMC_PLLP_WB0_OVERRIDE]

	pll_enable r1, r0, CLK_RESET_PLLM_BASE, 0
	pll_enable r1, r0, CLK_RESET_PLLC_BASE, 0
	pll_enable r1, r0, CLK_RESET_PLLX_BASE, 0

	b	_pll_m_c_x_done

_no_pll_iddq_exit:
	/* enable PLLM via PMC */
	mov32	r2, TEGRA_PMC_BASE
	ldr	r1, [r2, #PMC_PLLP_WB0_OVERRIDE]
	orr	r1, r1, #(1 << 12)
	str	r1, [r2, #PMC_PLLP_WB0_OVERRIDE]

	pll_enable r1, r0, CLK_RESET_PLLM_BASE, CLK_RESET_PLLM_MISC
	pll_enable r1, r0, CLK_RESET_PLLC_BASE, CLK_RESET_PLLC_MISC
	pll_enable r1, r0, CLK_RESET_PLLX_BASE, CLK_RESET_PLLX_MISC

_pll_m_c_x_done:
	pll_enable r1, r0, CLK_RESET_PLLP_BASE, CLK_RESET_PLLP_MISC
	pll_enable r1, r0, CLK_RESET_PLLA_BASE, CLK_RESET_PLLA_MISC

	pll_locked r1, r0, CLK_RESET_PLLM_BASE
	pll_locked r1, r0, CLK_RESET_PLLP_BASE
	pll_locked r1, r0, CLK_RESET_PLLA_BASE
	pll_locked r1, r0, CLK_RESET_PLLC_BASE
	pll_locked r1, r0, CLK_RESET_PLLX_BASE

	mov32	r7, TEGRA_TMRUS_BASE
	ldr	r1, [r7]
	add	r1, r1, #LOCK_DELAY
	wait_until r1, r7, r3

	adr	r5, tegra_sdram_pad_save

	ldr	r4, [r5, #0x18]		@ restore CLK_SOURCE_MSELECT
	str	r4, [r0, #CLK_RESET_CLK_SOURCE_MSELECT]

	ldr	r4, [r5, #0x1C]		@ restore SCLK_BURST
	str	r4, [r0, #CLK_RESET_SCLK_BURST]

	cmp	r10, #TEGRA30
	movweq	r4, #:lower16:((1 << 28) | (0x8))	@ burst policy is PLLX
	movteq	r4, #:upper16:((1 << 28) | (0x8))
	movwne	r4, #:lower16:((1 << 28) | (0xe))
	movtne	r4, #:upper16:((1 << 28) | (0xe))
	str	r4, [r0, #CLK_RESET_CCLK_BURST]

	/* Restore pad power state to normal */
	ldr	r1, [r5, #0x14]		@ PMC_IO_DPD_STATUS
	mvn	r1, r1
	bic	r1, r1, #(1 << 31)
	orr	r1, r1, #(1 << 30)
	str	r1, [r2, #PMC_IO_DPD_REQ]	@ DPD_OFF

	cmp	r10, #TEGRA30
	movweq	r0, #:lower16:TEGRA_EMC_BASE	@ r0 reserved for emc base
	movteq	r0, #:upper16:TEGRA_EMC_BASE
	cmp	r10, #TEGRA114
	movweq	r0, #:lower16:TEGRA_EMC0_BASE
	movteq	r0, #:upper16:TEGRA_EMC0_BASE
	cmp	r10, #TEGRA124
	movweq	r0, #:lower16:TEGRA124_EMC_BASE
	movteq	r0, #:upper16:TEGRA124_EMC_BASE

exit_self_refresh:
	ldr	r1, [r5, #0xC]		@ restore EMC_XM2VTTGENPADCTRL
	str	r1, [r0, #EMC_XM2VTTGENPADCTRL]
	ldr	r1, [r5, #0x10]		@ restore EMC_XM2VTTGENPADCTRL2
	str	r1, [r0, #EMC_XM2VTTGENPADCTRL2]
	ldr	r1, [r5, #0x8]		@ restore EMC_AUTO_CAL_INTERVAL
	str	r1, [r0, #EMC_AUTO_CAL_INTERVAL]

	/* Relock DLL */
	ldr	r1, [r0, #EMC_CFG_DIG_DLL]
	orr	r1, r1, #(1 << 30)	@ set DLL_RESET
	str	r1, [r0, #EMC_CFG_DIG_DLL]

	emc_timing_update r1, r0

	cmp	r10, #TEGRA114
	movweq	r1, #:lower16:TEGRA_EMC1_BASE
	movteq	r1, #:upper16:TEGRA_EMC1_BASE
	cmpeq	r0, r1

	ldr	r1, [r0, #EMC_AUTO_CAL_CONFIG]
	orr	r1, r1, #(1 << 31)	@ set AUTO_CAL_ACTIVE
	orreq	r1, r1, #(1 << 27)	@ set slave mode for channel 1
	str	r1, [r0, #EMC_AUTO_CAL_CONFIG]

emc_wait_auto_cal_onetime:
	ldr	r1, [r0, #EMC_AUTO_CAL_STATUS]
	tst	r1, #(1 << 31)		@ wait until AUTO_CAL_ACTIVE is cleared
	bne	emc_wait_auto_cal_onetime

	ldr	r1, [r0, #EMC_CFG]
	bic	r1, r1, #(1 << 31)	@ disable DRAM_CLK_STOP_PD
	str	r1, [r0, #EMC_CFG]

	mov	r1, #0
	str	r1, [r0, #EMC_SELF_REF]	@ take DRAM out of self refresh
	mov	r1, #1
	cmp	r10, #TEGRA30
	streq	r1, [r0, #EMC_NOP]
	streq	r1, [r0, #EMC_NOP]
	streq	r1, [r0, #EMC_REFRESH]

	emc_device_mask r1, r0

exit_selfrefresh_loop:
	ldr	r2, [r0, #EMC_EMC_STATUS]
	ands	r2, r2, r1
	bne	exit_selfrefresh_loop

	lsr	r1, r1, #8		@ devSel, bit0:dev0, bit1:dev1

	mov32	r7, TEGRA_TMRUS_BASE
	ldr	r2, [r0, #EMC_FBIO_CFG5]

	and	r2, r2,	#3		@ check DRAM_TYPE
	cmp	r2, #2
	beq	emc_lpddr2

	/* Issue a ZQ_CAL for dev0 - DDR3 */
	mov32	r2, 0x80000011		@ DEV_SELECTION=2, LENGTH=LONG, CMD=1
	str	r2, [r0, #EMC_ZQ_CAL]
	ldr	r2, [r7]
	add	r2, r2, #10
	wait_until r2, r7, r3

	tst	r1, #2
	beq	zcal_done

	/* Issue a ZQ_CAL for dev1 - DDR3 */
	mov32	r2, 0x40000011		@ DEV_SELECTION=1, LENGTH=LONG, CMD=1
	str	r2, [r0, #EMC_ZQ_CAL]
	ldr	r2, [r7]
	add	r2, r2, #10
	wait_until r2, r7, r3
	b	zcal_done

emc_lpddr2:
	/* Issue a ZQ_CAL for dev0 - LPDDR2 */
	mov32	r2, 0x800A00AB		@ DEV_SELECTION=2, MA=10, OP=0xAB
	str	r2, [r0, #EMC_MRW]
	ldr	r2, [r7]
	add	r2, r2, #1
	wait_until r2, r7, r3

	tst	r1, #2
	beq	zcal_done

	/* Issue a ZQ_CAL for dev0 - LPDDR2 */
	mov32	r2, 0x400A00AB		@ DEV_SELECTION=1, MA=10, OP=0xAB
	str	r2, [r0, #EMC_MRW]
	ldr	r2, [r7]
	add	r2, r2, #1
	wait_until r2, r7, r3

zcal_done:
	mov	r1, #0			@ unstall all transactions
	str	r1, [r0, #EMC_REQ_CTRL]
	ldr	r1, [r5, #0x4]		@ restore EMC_ZCAL_INTERVAL
	str	r1, [r0, #EMC_ZCAL_INTERVAL]
	ldr	r1, [r5, #0x0]		@ restore EMC_CFG
	str	r1, [r0, #EMC_CFG]

	/* Tegra114 had dual EMC channel, now config the other one */
	cmp	r10, #TEGRA114
	bne	__no_dual_emc_chanl
	mov32	r1, TEGRA_EMC1_BASE
	cmp	r0, r1
	movne	r0, r1
	addne	r5, r5, #0x20
	bne	exit_self_refresh
__no_dual_emc_chanl:

	mov32	r0, TEGRA_PMC_BASE
	ldr	r0, [r0, #PMC_SCRATCH41]
	ret	r0			@ jump to tegra_resume
ENDPROC(tegra30_lp1_reset)

	.align	L1_CACHE_SHIFT
tegra30_sdram_pad_address:
	.word	TEGRA_EMC_BASE + EMC_CFG				@0x0
	.word	TEGRA_EMC_BASE + EMC_ZCAL_INTERVAL			@0x4
	.word	TEGRA_EMC_BASE + EMC_AUTO_CAL_INTERVAL			@0x8
	.word	TEGRA_EMC_BASE + EMC_XM2VTTGENPADCTRL			@0xc
	.word	TEGRA_EMC_BASE + EMC_XM2VTTGENPADCTRL2			@0x10
	.word	TEGRA_PMC_BASE + PMC_IO_DPD_STATUS			@0x14
	.word	TEGRA_CLK_RESET_BASE + CLK_RESET_CLK_SOURCE_MSELECT	@0x18
	.word	TEGRA_CLK_RESET_BASE + CLK_RESET_SCLK_BURST		@0x1c
tegra30_sdram_pad_address_end:

tegra114_sdram_pad_address:
	.word	TEGRA_EMC0_BASE + EMC_CFG				@0x0
	.word	TEGRA_EMC0_BASE + EMC_ZCAL_INTERVAL			@0x4
	.word	TEGRA_EMC0_BASE + EMC_AUTO_CAL_INTERVAL			@0x8
	.word	TEGRA_EMC0_BASE + EMC_XM2VTTGENPADCTRL			@0xc
	.word	TEGRA_EMC0_BASE + EMC_XM2VTTGENPADCTRL2			@0x10
	.word	TEGRA_PMC_BASE + PMC_IO_DPD_STATUS			@0x14
	.word	TEGRA_CLK_RESET_BASE + CLK_RESET_CLK_SOURCE_MSELECT	@0x18
	.word	TEGRA_CLK_RESET_BASE + CLK_RESET_SCLK_BURST		@0x1c
	.word	TEGRA_EMC1_BASE + EMC_CFG				@0x20
	.word	TEGRA_EMC1_BASE + EMC_ZCAL_INTERVAL			@0x24
	.word	TEGRA_EMC1_BASE + EMC_AUTO_CAL_INTERVAL			@0x28
	.word	TEGRA_EMC1_BASE + EMC_XM2VTTGENPADCTRL			@0x2c
	.word	TEGRA_EMC1_BASE + EMC_XM2VTTGENPADCTRL2			@0x30
tegra114_sdram_pad_adress_end:

tegra124_sdram_pad_address:
	.word	TEGRA124_EMC_BASE + EMC_CFG				@0x0
	.word	TEGRA124_EMC_BASE + EMC_ZCAL_INTERVAL			@0x4
	.word	TEGRA124_EMC_BASE + EMC_AUTO_CAL_INTERVAL		@0x8
	.word	TEGRA124_EMC_BASE + EMC_XM2VTTGENPADCTRL		@0xc
	.word	TEGRA124_EMC_BASE + EMC_XM2VTTGENPADCTRL2		@0x10
	.word	TEGRA_PMC_BASE + PMC_IO_DPD_STATUS			@0x14
	.word	TEGRA_CLK_RESET_BASE + CLK_RESET_CLK_SOURCE_MSELECT	@0x18
	.word	TEGRA_CLK_RESET_BASE + CLK_RESET_SCLK_BURST		@0x1c
tegra124_sdram_pad_address_end:

tegra30_sdram_pad_size:
	.word	tegra30_sdram_pad_address_end - tegra30_sdram_pad_address

tegra114_sdram_pad_size:
	.word	tegra114_sdram_pad_adress_end - tegra114_sdram_pad_address

	.type	tegra_sdram_pad_save, %object
tegra_sdram_pad_save:
	.rept (tegra114_sdram_pad_adress_end - tegra114_sdram_pad_address) / 4
	.long	0
	.endr

/*
 * tegra30_tear_down_core
 *
 * copied into and executed from IRAM
 * puts memory in self-refresh for LP0 and LP1
 */
tegra30_tear_down_core:
	bl	tegra30_sdram_self_refresh
	bl	tegra30_switch_cpu_to_clk32k
	b	tegra30_enter_sleep

/*
 * tegra30_switch_cpu_to_clk32k
 *
 * In LP0 and LP1 all PLLs will be turned off. Switching the CPU and System CLK
 * to the 32KHz clock.
 * r4 = TEGRA_PMC_BASE
 * r5 = TEGRA_CLK_RESET_BASE
 * r6 = TEGRA_FLOW_CTRL_BASE
 * r7 = TEGRA_TMRUS_BASE
 * r10= SoC ID
 */
tegra30_switch_cpu_to_clk32k:
	/*
	 * start by jumping to CLKM to safely disable PLLs, then jump to
	 * CLKS.
	 */
	mov	r0, #(1 << 28)
	str	r0, [r5, #CLK_RESET_SCLK_BURST]
	/* 2uS delay delay between changing SCLK and CCLK */
	ldr	r1, [r7]
	add	r1, r1, #2
	wait_until r1, r7, r9
	str	r0, [r5, #CLK_RESET_CCLK_BURST]
	mov	r0, #0
	str	r0, [r5, #CLK_RESET_CCLK_DIVIDER]
	str	r0, [r5, #CLK_RESET_SCLK_DIVIDER]

	/* switch the clock source of mselect to be CLK_M */
	ldr	r0, [r5, #CLK_RESET_CLK_SOURCE_MSELECT]
	orr	r0, r0, #MSELECT_CLKM
	str	r0, [r5, #CLK_RESET_CLK_SOURCE_MSELECT]

	/* 2uS delay delay between changing SCLK and disabling PLLs */
	ldr	r1, [r7]
	add	r1, r1, #2
	wait_until r1, r7, r9

	/* disable PLLM via PMC in LP1 */
	ldr	r0, [r4, #PMC_PLLP_WB0_OVERRIDE]
	bic	r0, r0, #(1 << 12)
	str	r0, [r4, #PMC_PLLP_WB0_OVERRIDE]

	/* disable PLLP, PLLA, PLLC and PLLX */
	ldr	r0, [r5, #CLK_RESET_PLLP_BASE]
	bic	r0, r0, #(1 << 30)
	str	r0, [r5, #CLK_RESET_PLLP_BASE]
	ldr	r0, [r5, #CLK_RESET_PLLA_BASE]
	bic	r0, r0, #(1 << 30)
	str	r0, [r5, #CLK_RESET_PLLA_BASE]
	ldr	r0, [r5, #CLK_RESET_PLLC_BASE]
	bic	r0, r0, #(1 << 30)
	str	r0, [r5, #CLK_RESET_PLLC_BASE]
	ldr	r0, [r5, #CLK_RESET_PLLX_BASE]
	bic	r0, r0, #(1 << 30)
	str	r0, [r5, #CLK_RESET_PLLX_BASE]

	cmp	r10, #TEGRA30
	beq	_no_pll_in_iddq
	pll_iddq_entry r1, r5, CLK_RESET_PLLX_MISC3, CLK_RESET_PLLX_MISC3_IDDQ
_no_pll_in_iddq:

	/* switch to CLKS */
	mov	r0, #0	/* brust policy = 32KHz */
	str	r0, [r5, #CLK_RESET_SCLK_BURST]

	ret	lr

/*
 * tegra30_enter_sleep
 *
 * uses flow controller to enter sleep state
 * executes from IRAM with SDRAM in selfrefresh when target state is LP0 or LP1
 * executes from SDRAM with target state is LP2
 * r6 = TEGRA_FLOW_CTRL_BASE
 */
tegra30_enter_sleep:
	cpu_id	r1

	cpu_to_csr_reg	r2, r1
	ldr	r0, [r6, r2]
	orr	r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
	orr	r0, r0, #FLOW_CTRL_CSR_ENABLE
	str	r0, [r6, r2]

	tegra_get_soc_id TEGRA_APB_MISC_BASE, r10
	cmp	r10, #TEGRA30
	mov	r0, #FLOW_CTRL_WAIT_FOR_INTERRUPT
	orreq	r0, r0, #FLOW_CTRL_HALT_CPU_IRQ | FLOW_CTRL_HALT_CPU_FIQ
	orrne   r0, r0, #FLOW_CTRL_HALT_LIC_IRQ | FLOW_CTRL_HALT_LIC_FIQ

	cpu_to_halt_reg r2, r1
	str	r0, [r6, r2]
	dsb
	ldr	r0, [r6, r2] /* memory barrier */

halted:
	isb
	dsb
	wfi	/* CPU should be power gated here */

	/* !!!FIXME!!! Implement halt failure handler */
	b	halted

/*
 * tegra30_sdram_self_refresh
 *
 * called with MMU off and caches disabled
 * must be executed from IRAM
 * r4 = TEGRA_PMC_BASE
 * r5 = TEGRA_CLK_RESET_BASE
 * r6 = TEGRA_FLOW_CTRL_BASE
 * r7 = TEGRA_TMRUS_BASE
 * r10= SoC ID
 */
tegra30_sdram_self_refresh:

	adr	r8, tegra_sdram_pad_save
	tegra_get_soc_id TEGRA_APB_MISC_BASE, r10
	cmp	r10, #TEGRA30
	adreq	r2, tegra30_sdram_pad_address
	ldreq	r3, tegra30_sdram_pad_size
	cmp	r10, #TEGRA114
	adreq	r2, tegra114_sdram_pad_address
	ldreq	r3, tegra114_sdram_pad_size
	cmp	r10, #TEGRA124
	adreq	r2, tegra124_sdram_pad_address
	ldreq	r3, tegra30_sdram_pad_size

	mov	r9, #0

padsave:
	ldr	r0, [r2, r9]		@ r0 is the addr in the pad_address

	ldr	r1, [r0]
	str	r1, [r8, r9]		@ save the content of the addr

	add	r9, r9, #4
	cmp	r3, r9
	bne	padsave
padsave_done:

	dsb

	cmp	r10, #TEGRA30
	ldreq	r0, =TEGRA_EMC_BASE	@ r0 reserved for emc base addr
	cmp	r10, #TEGRA114
	ldreq	r0, =TEGRA_EMC0_BASE
	cmp	r10, #TEGRA124
	ldreq	r0, =TEGRA124_EMC_BASE

enter_self_refresh:
	cmp	r10, #TEGRA30
	mov	r1, #0
	str	r1, [r0, #EMC_ZCAL_INTERVAL]
	str	r1, [r0, #EMC_AUTO_CAL_INTERVAL]
	ldr	r1, [r0, #EMC_CFG]
	bic	r1, r1, #(1 << 28)
	bicne	r1, r1, #(1 << 29)
	str	r1, [r0, #EMC_CFG]	@ disable DYN_SELF_REF

	emc_timing_update r1, r0

	ldr	r1, [r7]
	add	r1, r1, #5
	wait_until r1, r7, r2

emc_wait_auto_cal:
	ldr	r1, [r0, #EMC_AUTO_CAL_STATUS]
	tst	r1, #(1 << 31)		@ wait until AUTO_CAL_ACTIVE is cleared
	bne	emc_wait_auto_cal

	mov	r1, #3
	str	r1, [r0, #EMC_REQ_CTRL]	@ stall incoming DRAM requests

emcidle:
	ldr	r1, [r0, #EMC_EMC_STATUS]
	tst	r1, #4
	beq	emcidle

	mov	r1, #1
	str	r1, [r0, #EMC_SELF_REF]

	emc_device_mask r1, r0

emcself:
	ldr	r2, [r0, #EMC_EMC_STATUS]
	and	r2, r2, r1
	cmp	r2, r1
	bne	emcself			@ loop until DDR in self-refresh

	/* Put VTTGEN in the lowest power mode */
	ldr	r1, [r0, #EMC_XM2VTTGENPADCTRL]
	mov32	r2, 0xF8F8FFFF	@ clear XM2VTTGEN_DRVUP and XM2VTTGEN_DRVDN
	and	r1, r1, r2
	str	r1, [r0, #EMC_XM2VTTGENPADCTRL]
	ldr	r1, [r0, #EMC_XM2VTTGENPADCTRL2]
	cmp	r10, #TEGRA30
	orreq	r1, r1, #7		@ set E_NO_VTTGEN
	orrne	r1, r1, #0x3f
	str	r1, [r0, #EMC_XM2VTTGENPADCTRL2]

	emc_timing_update r1, r0

	/* Tegra114 had dual EMC channel, now config the other one */
	cmp	r10, #TEGRA114
	bne	no_dual_emc_chanl
	mov32	r1, TEGRA_EMC1_BASE
	cmp	r0, r1
	movne	r0, r1
	bne	enter_self_refresh
no_dual_emc_chanl:

	ldr	r1, [r4, #PMC_CTRL]
	tst	r1, #PMC_CTRL_SIDE_EFFECT_LP0
	bne	pmc_io_dpd_skip
	/*
	 * Put DDR_DATA, DISC_ADDR_CMD, DDR_ADDR_CMD, POP_ADDR_CMD, POP_CLK
	 * and COMP in the lowest power mode when LP1.
	 */
	mov32	r1, 0x8EC00000
	str	r1, [r4, #PMC_IO_DPD_REQ]
pmc_io_dpd_skip:

	dsb

	ret	lr

	.ltorg
/* dummy symbol for end of IRAM */
	.align L1_CACHE_SHIFT
	.global tegra30_iram_end
tegra30_iram_end:
	b	.
#endif