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
|
/*
* SA11x0 Assembler Sleep/WakeUp Management Routines
*
* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License.
*
* History:
*
* 2001-02-06: Cliff Brake Initial code
*
* 2001-08-29: Nicolas Pitre Simplified.
*
* 2002-05-27: Nicolas Pitre Revisited, more cleanup and simplification.
* Storage is on the stack now.
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/arch/hardware.h>
.text
/*
* sa1100_cpu_suspend()
*
* Causes sa11x0 to enter sleep state
*
*/
ENTRY(sa1100_cpu_suspend)
stmfd sp!, {r4 - r12, lr} @ save registers on stack
@ get coprocessor registers
mrc p15, 0, r4, c3, c0, 0 @ domain ID
mrc p15, 0, r5, c2, c0, 0 @ translation table base addr
mrc p15, 0, r6, c13, c0, 0 @ PID
mrc p15, 0, r7, c1, c0, 0 @ control reg
@ store them plus current virtual stack ptr on stack
mov r8, sp
stmfd sp!, {r4 - r8}
@ preserve phys address of stack
mov r0, sp
bl sleep_phys_sp
ldr r1, =sleep_save_sp
str r0, [r1]
@ clean data cache and invalidate WB
bl v4wb_flush_kern_cache_all
@ disable clock switching
mcr p15, 0, r1, c15, c2, 2
@ Adjust memory timing before lowering CPU clock
@ Clock speed adjustment without changing memory timing makes
@ CPU hang in some cases
ldr r0, =MDREFR
ldr r1, [r0]
orr r1, r1, #MDREFR_K1DB2
str r1, [r0]
@ delay 90us and set CPU PLL to lowest speed
@ fixes resume problem on high speed SA1110
mov r0, #90
bl __udelay
ldr r0, =PPCR
mov r1, #0
str r1, [r0]
mov r0, #90
bl __udelay
/*
* SA1110 SDRAM controller workaround. register values:
*
* r0 = &MSC0
* r1 = &MSC1
* r2 = &MSC2
* r3 = MSC0 value
* r4 = MSC1 value
* r5 = MSC2 value
* r6 = &MDREFR
* r7 = first MDREFR value
* r8 = second MDREFR value
* r9 = &MDCNFG
* r10 = MDCNFG value
* r11 = third MDREFR value
* r12 = &PMCR
* r13 = PMCR value (1)
*/
ldr r0, =MSC0
ldr r1, =MSC1
ldr r2, =MSC2
ldr r3, [r0]
bic r3, r3, #FMsk(MSC_RT)
bic r3, r3, #FMsk(MSC_RT)<<16
ldr r4, [r1]
bic r4, r4, #FMsk(MSC_RT)
bic r4, r4, #FMsk(MSC_RT)<<16
ldr r5, [r2]
bic r5, r5, #FMsk(MSC_RT)
bic r5, r5, #FMsk(MSC_RT)<<16
ldr r6, =MDREFR
ldr r7, [r6]
bic r7, r7, #0x0000FF00
bic r7, r7, #0x000000F0
orr r8, r7, #MDREFR_SLFRSH
ldr r9, =MDCNFG
ldr r10, [r9]
bic r10, r10, #(MDCNFG_DE0+MDCNFG_DE1)
bic r10, r10, #(MDCNFG_DE2+MDCNFG_DE3)
bic r11, r8, #MDREFR_SLFRSH
bic r11, r11, #MDREFR_E1PIN
ldr r12, =PMCR
mov r13, #PMCR_SF
b sa1110_sdram_controller_fix
.align 5
sa1110_sdram_controller_fix:
@ Step 1 clear RT field of all MSCx registers
str r3, [r0]
str r4, [r1]
str r5, [r2]
@ Step 2 clear DRI field in MDREFR
str r7, [r6]
@ Step 3 set SLFRSH bit in MDREFR
str r8, [r6]
@ Step 4 clear DE bis in MDCNFG
str r10, [r9]
@ Step 5 clear DRAM refresh control register
str r11, [r6]
@ Wow, now the hardware suspend request pins can be used, that makes them functional for
@ about 7 ns out of the entire time that the CPU is running!
@ Step 6 set force sleep bit in PMCR
str r13, [r12]
20: b 20b @ loop waiting for sleep
/*
* cpu_sa1100_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(sa1100_cpu_resume)
mov r0, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
msr cpsr_c, r0 @ set SVC, irqs off
ldr r0, sleep_save_sp @ stack phys addr
ldr r2, =resume_after_mmu @ its absolute virtual address
ldmfd r0, {r4 - r7, sp} @ CP regs + virt stack ptr
mov r1, #0
mcr p15, 0, r1, c8, c7, 0 @ flush I+D TLBs
mcr p15, 0, r1, c7, c7, 0 @ flush I&D cache
mcr p15, 0, r1, c9, c0, 0 @ invalidate RB
mcr p15, 0, r1, c9, c0, 5 @ allow user space to use RB
mcr p15, 0, r4, c3, c0, 0 @ domain ID
mcr p15, 0, r5, c2, c0, 0 @ translation table base addr
mcr p15, 0, r6, c13, c0, 0 @ PID
b resume_turn_on_mmu @ cache align execution
.align 5
resume_turn_on_mmu:
mcr p15, 0, r7, c1, c0, 0 @ turn on MMU, caches, etc.
nop
mov pc, r2 @ jump to virtual addr
nop
nop
nop
sleep_save_sp:
.word 0 @ preserve stack phys ptr here
.text
resume_after_mmu:
mcr p15, 0, r1, c15, c1, 2 @ enable clock switching
ldmfd sp!, {r4 - r12, pc} @ return to caller
|
