Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
ff2e6d7e | 2 | * This file contains the power_save function for 970-family CPUs. |
1da177e4 LT |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
1da177e4 LT |
10 | #include <linux/threads.h> |
11 | #include <asm/processor.h> | |
12 | #include <asm/page.h> | |
13 | #include <asm/cputable.h> | |
14 | #include <asm/thread_info.h> | |
15 | #include <asm/ppc_asm.h> | |
0013a854 | 16 | #include <asm/asm-offsets.h> |
7230c564 | 17 | #include <asm/irqflags.h> |
1da177e4 LT |
18 | |
19 | #undef DEBUG | |
20 | ||
21 | .text | |
22 | ||
1da177e4 LT |
23 | _GLOBAL(power4_idle) |
24 | BEGIN_FTR_SECTION | |
25 | blr | |
26 | END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP) | |
1da177e4 | 27 | /* Now check if user or arch enabled NAP mode */ |
e58c3495 DG |
28 | LOAD_REG_ADDRBASE(r3,powersave_nap) |
29 | lwz r4,ADDROFF(powersave_nap)(r3) | |
1da177e4 LT |
30 | cmpwi 0,r4,0 |
31 | beqlr | |
32 | ||
7230c564 | 33 | /* Hard disable interrupts */ |
d04c56f7 PM |
34 | mfmsr r7 |
35 | rldicl r0,r7,48,1 | |
36 | rotldi r0,r0,16 | |
7230c564 BH |
37 | mtmsrd r0,1 |
38 | ||
39 | /* Check if something happened while soft-disabled */ | |
40 | lbz r0,PACAIRQHAPPENED(r13) | |
41 | cmpwi cr0,r0,0 | |
42 | bnelr | |
43 | ||
44 | /* Soft-enable interrupts */ | |
45 | #ifdef CONFIG_TRACE_IRQFLAGS | |
46 | mflr r0 | |
47 | std r0,16(r1) | |
48 | stdu r1,-128(r1) | |
b1576fec | 49 | bl trace_hardirqs_on |
7230c564 BH |
50 | addi r1,r1,128 |
51 | ld r0,16(r1) | |
52 | mtlr r0 | |
01e8ec44 | 53 | mfmsr r7 |
7230c564 BH |
54 | #endif /* CONFIG_TRACE_IRQFLAGS */ |
55 | ||
d04c56f7 PM |
56 | li r0,1 |
57 | stb r0,PACASOFTIRQEN(r13) /* we'll hard-enable shortly */ | |
1da177e4 LT |
58 | BEGIN_FTR_SECTION |
59 | DSSALL | |
60 | sync | |
61 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) | |
9778b696 | 62 | CURRENT_THREAD_INFO(r9, r1) |
f39224a8 PM |
63 | ld r8,TI_LOCAL_FLAGS(r9) /* set napping bit */ |
64 | ori r8,r8,_TLF_NAPPING /* so when we take an exception */ | |
65 | std r8,TI_LOCAL_FLAGS(r9) /* it will return to our caller */ | |
ff2e6d7e | 66 | ori r7,r7,MSR_EE |
1da177e4 | 67 | oris r7,r7,MSR_POW@h |
f39224a8 | 68 | 1: sync |
1da177e4 LT |
69 | isync |
70 | mtmsrd r7 | |
71 | isync | |
f39224a8 PM |
72 | b 1b |
73 |