aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/alchemy/common/sleeper.S
blob: 77f3c743b716428c106066042c4f926ef900f7af (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
/*
 * Copyright 2002 Embedded Edge, LLC
 * Author: dan@embeddededge.com
 *
 * Sleep helper for Au1xxx sleep mode.
 *
 * This program is free software; you can redistribute	it and/or modify it
 * under  the terms of	the GNU General	 Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>

	.extern __flush_cache_all

	.text
	.set noreorder
	.set noat
	.align	5


/* preparatory stuff */
.macro	SETUP_SLEEP
	subu	sp, PT_SIZE
	sw	$1, PT_R1(sp)
	sw	$2, PT_R2(sp)
	sw	$3, PT_R3(sp)
	sw	$4, PT_R4(sp)
	sw	$5, PT_R5(sp)
	sw	$6, PT_R6(sp)
	sw	$7, PT_R7(sp)
	sw	$16, PT_R16(sp)
	sw	$17, PT_R17(sp)
	sw	$18, PT_R18(sp)
	sw	$19, PT_R19(sp)
	sw	$20, PT_R20(sp)
	sw	$21, PT_R21(sp)
	sw	$22, PT_R22(sp)
	sw	$23, PT_R23(sp)
	sw	$26, PT_R26(sp)
	sw	$27, PT_R27(sp)
	sw	$28, PT_R28(sp)
	sw	$30, PT_R30(sp)
	sw	$31, PT_R31(sp)
	mfc0	k0, CP0_STATUS
	sw	k0, 0x20(sp)
	mfc0	k0, CP0_CONTEXT
	sw	k0, 0x1c(sp)
	mfc0	k0, CP0_PAGEMASK
	sw	k0, 0x18(sp)
	mfc0	k0, CP0_CONFIG
	sw	k0, 0x14(sp)

	/* flush caches to make sure context is in memory */
	la	t1, __flush_cache_all
	lw	t0, 0(t1)
	jalr	t0
	 nop

	/* Now set up the scratch registers so the boot rom will
	 * return to this point upon wakeup.
	 * sys_scratch0 : SP
	 * sys_scratch1 : RA
	 */
	lui	t3, 0xb190		/* sys_xxx */
	sw	sp, 0x0018(t3)
	la	k0, alchemy_sleep_wakeup	/* resume path */
	sw	k0, 0x001c(t3)
.endm

.macro	DO_SLEEP
	/* put power supply and processor to sleep */
	sw	zero, 0x0078(t3)	/* sys_slppwr */
	sync
	sw	zero, 0x007c(t3)	/* sys_sleep */
	sync
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	nop
.endm

/* sleep code for Au1000/Au1100/Au1500 memory controller type */
LEAF(alchemy_sleep_au1000)

	SETUP_SLEEP

	/* cache following instructions, as memory gets put to sleep */
	la	t0, 1f
	.set	mips3
	cache	0x14, 0(t0)
	cache	0x14, 32(t0)
	cache	0x14, 64(t0)
	cache	0x14, 96(t0)
	.set	mips0

1:	lui 	a0, 0xb400		/* mem_xxx */
	sw	zero, 0x001c(a0) 	/* Precharge */
	sync
	sw	zero, 0x0020(a0)	/* Auto Refresh */
	sync
	sw	zero, 0x0030(a0)  	/* Sleep */
	sync

	DO_SLEEP

END(alchemy_sleep_au1000)

/* sleep code for Au1550/Au1200 memory controller type */
LEAF(alchemy_sleep_au1550)

	SETUP_SLEEP

	/* cache following instructions, as memory gets put to sleep */
	la	t0, 1f
	.set	mips3
	cache	0x14, 0(t0)
	cache	0x14, 32(t0)
	cache	0x14, 64(t0)
	cache	0x14, 96(t0)
	.set	mips0

1:	lui 	a0, 0xb400		/* mem_xxx */
	sw	zero, 0x08c0(a0) 	/* Precharge */
	sync
	sw	zero, 0x08d0(a0)	/* Self Refresh */
	sync

	/* wait for sdram to enter self-refresh mode */
	lui 	t0, 0x0100
2:	lw 	t1, 0x0850(a0)		/* mem_sdstat */
	and	t2, t1, t0
	beq	t2, zero, 2b
	 nop

	/* disable SDRAM clocks */
	lui	t0, 0xcfff
	ori	t0, t0, 0xffff
	lw 	t1, 0x0840(a0)		/* mem_sdconfiga */
	and 	t1, t0, t1		/* clear CE[1:0] */
	sw 	t1, 0x0840(a0)		/* mem_sdconfiga */
	sync

	DO_SLEEP

END(alchemy_sleep_au1550)


	/* This is where we return upon wakeup.
	 * Reload all of the registers and return.
	 */
LEAF(alchemy_sleep_wakeup)
	lw	k0, 0x20(sp)
	mtc0	k0, CP0_STATUS
	lw	k0, 0x1c(sp)
	mtc0	k0, CP0_CONTEXT
	lw	k0, 0x18(sp)
	mtc0	k0, CP0_PAGEMASK
	lw	k0, 0x14(sp)
	mtc0	k0, CP0_CONFIG

	/* We need to catch the early Alchemy SOCs with
	 * the write-only Config[OD] bit and set it back to one...
	 */
	jal	au1x00_fixup_config_od
	 nop
	lw	$1, PT_R1(sp)
	lw	$2, PT_R2(sp)
	lw	$3, PT_R3(sp)
	lw	$4, PT_R4(sp)
	lw	$5, PT_R5(sp)
	lw	$6, PT_R6(sp)
	lw	$7, PT_R7(sp)
	lw	$16, PT_R16(sp)
	lw	$17, PT_R17(sp)
	lw	$18, PT_R18(sp)
	lw	$19, PT_R19(sp)
	lw	$20, PT_R20(sp)
	lw	$21, PT_R21(sp)
	lw	$22, PT_R22(sp)
	lw	$23, PT_R23(sp)
	lw	$26, PT_R26(sp)
	lw	$27, PT_R27(sp)
	lw	$28, PT_R28(sp)
	lw	$30, PT_R30(sp)
	lw	$31, PT_R31(sp)
	jr	ra
	 addiu	sp, PT_SIZE
END(alchemy_sleep_wakeup)