summaryrefslogtreecommitdiffstats
path: root/arch/unicore32/kernel/sleep.S
blob: 23151abe53c67b690033b782336a8193e9b7ebfe (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
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * linux/arch/unicore32/kernel/sleep.S
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 *	Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
 *	Copyright (C) 2001-2010 Guan Xuetao
 */

#include <linux/linkage.h>
#include <asm/assembler.h>
#include <mach/hardware.h>

		.text

pkunity_cpu_save_cp:

	@ get coprocessor registers

	movc	r3, p0.c7, #0			@ PID
	movc	r4, p0.c2, #0			@ translation table base addr
	movc	r5, p0.c1, #0			@ control reg


	@ store them plus current virtual stack ptr on stack
	mov	r6, sp
	stm.w	(r3 - r6), [sp-]

	mov	pc, lr

pkunity_cpu_save_sp:
	@ preserve phys address of stack
	mov	r0, sp
	stw.w	lr, [sp+], #-4
	b.l	sleep_phys_sp
	ldw	r1, =sleep_save_sp
	stw	r0, [r1]
	ldw.w	pc, [sp]+, #4

/*
 * puv3_cpu_suspend()
 *
 * Forces CPU into sleep state.
 *
 * r0 = value for PWRMODE M field for desired sleep state
 */

ENTRY(puv3_cpu_suspend)
	stm.w	(r16 - r27, lr), [sp-]		@ save registers on stack
	stm.w	(r4 - r15), [sp-]		@ save registers on stack

#ifdef	CONFIG_UNICORE_FPU_F64
	sfm.w	(f0  - f7 ), [sp-]
	sfm.w	(f8  - f15), [sp-]
	sfm.w	(f16 - f23), [sp-]
	sfm.w	(f24 - f31), [sp-]
	cff	r4, s31
	stm.w	(r4), [sp-]
#endif
	b.l	pkunity_cpu_save_cp

	b.l	pkunity_cpu_save_sp

	@ clean data cache
	mov	r1, #0
	movc	p0.c5, r1, #14
	nop
	nop
	nop
	nop



	@ DDR2 BaseAddr
	ldw	r0, =(PKUNITY_DDR2CTRL_BASE)

	@ PM BaseAddr
	ldw	r1, =(PKUNITY_PM_BASE)

	@ set PLL_SYS_CFG reg, 275
	movl	r6, #0x00002401
	stw	r6, [r1+], #0x18
	@ set PLL_DDR_CFG reg, 66MHz
	movl	r6, #0x00100c00
	stw	r6, [r1+], #0x1c

	@ set wake up source
	movl	r8, #0x800001ff		@ epip4d
	stw	r8, [r1+], #0xc

	@ set PGSR
	movl	r5, #0x40000
	stw	r5, [r1+], #0x10

	@ prepare DDR2 refresh settings
	ldw	r5, [r0+], #0x24
	or	r5, r5, #0x00000001

	@ prepare PMCR for PLL changing
	movl	r6, #0xc

	@ prepare for closing PLL
	movl	r7, #0x1

	@ prepare sleep mode
	mov	r8, #0x1

@	movl	r0, 0x11111111
@	put_word_ocd r0
	b	pkunity_cpu_do_suspend

	.ltorg
	.align	5
pkunity_cpu_do_suspend:
	b	101f
	@ put DDR2 into self-refresh
100:	stw	r5, [r0+], #0x24
	@ change PLL
	stw	r6, [r1]
	b	1f

	.ltorg
	.align	5
101:	b	102f
	@ wait for PLL changing complete
1:	ldw	r6, [r1+], #0x44
	csub.a	r6, #0x1
	bne	1b
	b	2f

	.ltorg
	.align	5
102:	b	100b
	@ close PLL
2:	stw	r7, [r1+], #0x4
	@ enter sleep mode
	stw	r8, [r1]
3:	b	3b




/*
 * puv3_cpu_resume()
 *
 * entry point from bootloader into kernel during resume
 *
 * Note: Yes, part of the following code is located into the .data section.
 *       This is to allow sleep_save_sp to be accessed with a relative load
 *       while we can't rely on any MMU translation.  We could have put
 *       sleep_save_sp in the .text section as well, but some setups might
 *       insist on it to be truly read-only.
 */

	.data
	.align 5
ENTRY(puv3_cpu_resume)
@	movl	r0, 0x20202020
@	put_word_ocd r0

	ldw	r0, sleep_save_sp		@ stack phys addr
	ldw	r2, =resume_after_mmu		@ its absolute virtual address
	ldm	(r3 - r6), [r0]+		@ CP regs + virt stack ptr
	mov	sp, r6				@ CP regs + virt stack ptr

	mov	r1, #0
	movc	p0.c6, r1, #6			@ invalidate I & D TLBs
	movc	p0.c5, r1, #28			@ invalidate I & D caches, BTB

	movc	p0.c7, r3, #0			@ PID
	movc	p0.c2, r4, #0			@ translation table base addr
	movc	p0.c1, r5, #0			@ control reg, turn on mmu
	nop
	jump	r2
	nop
	nop
	nop
	nop
	nop

sleep_save_sp:
	.word	0				@ preserve stack phys ptr here

	.text
resume_after_mmu:
@	movl	r0, 0x30303030
@	put_word_ocd r0

#ifdef	CONFIG_UNICORE_FPU_F64
	lfm.w	(f0  - f7 ), [sp]+
	lfm.w	(f8  - f15), [sp]+
	lfm.w	(f16 - f23), [sp]+
	lfm.w	(f24 - f31), [sp]+
	ldm.w	(r4), [sp]+
	ctf	r4, s31
#endif
	ldm.w	(r4 - r15), [sp]+		@ restore registers from stack
	ldm.w	(r16 - r27, pc), [sp]+		@ return to caller