projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| fc4033b2 KG |
1 | /* |
| 2 | * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved. | |
| 3 | * Dave Liu <daveliu@freescale.com> | |
| 4 | * copy from idle_6xx.S and modify for e500 based processor, | |
| 5 | * implement the power_save function in idle. | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU General Public License | |
| 9 | * as published by the Free Software Foundation; either version | |
| 10 | * 2 of the License, or (at your option) any later version. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/threads.h> | |
| 14 | #include <asm/reg.h> | |
| 15 | #include <asm/page.h> | |
| 16 | #include <asm/cputable.h> | |
| 17 | #include <asm/thread_info.h> | |
| 18 | #include <asm/ppc_asm.h> | |
| 19 | #include <asm/asm-offsets.h> | |
| 2c86cd18 | 20 | #include <asm/feature-fixups.h> |
| fc4033b2 KG |
21 | |
| 22 | .text | |
| 23 | ||
| 24 | _GLOBAL(e500_idle) | |
| 9778b696 | 25 | CURRENT_THREAD_INFO(r3, r1) |
| fc4033b2 KG |
26 | lwz r4,TI_LOCAL_FLAGS(r3) /* set napping bit */ |
| 27 | ori r4,r4,_TLF_NAPPING /* so when we take an exception */ | |
| 28 | stw r4,TI_LOCAL_FLAGS(r3) /* it will return to our caller */ | |
| 29 | ||
| e33ee8b6 | 30 | #ifdef CONFIG_PPC_E500MC |
| ebf714ff SW |
31 | wrteei 1 |
| 32 | 1: wait | |
| 33 | ||
| 34 | /* | |
| 35 | * Guard against spurious wakeups (e.g. from a hypervisor) -- | |
| 36 | * any real interrupt will cause us to return to LR due to | |
| 37 | * _TLF_NAPPING. | |
| 38 | */ | |
| 39 | b 1b | |
| 40 | #else | |
| fc4033b2 KG |
41 | /* Check if we can nap or doze, put HID0 mask in r3 */ |
| 42 | lis r3,0 | |
| 43 | BEGIN_FTR_SECTION | |
| 44 | lis r3,HID0_DOZE@h | |
| 45 | END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) | |
| 46 | ||
| 47 | BEGIN_FTR_SECTION | |
| 48 | /* Now check if user enabled NAP mode */ | |
| 49 | lis r4,powersave_nap@ha | |
| 50 | lwz r4,powersave_nap@l(r4) | |
| 51 | cmpwi 0,r4,0 | |
| 52 | beq 1f | |
| 53 | stwu r1,-16(r1) | |
| 54 | mflr r0 | |
| 55 | stw r0,20(r1) | |
| 56 | bl flush_dcache_L1 | |
| 57 | lwz r0,20(r1) | |
| 58 | addi r1,r1,16 | |
| 59 | mtlr r0 | |
| 60 | lis r3,HID0_NAP@h | |
| 61 | END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) | |
| 62 | 1: | |
| 63 | /* Go to NAP or DOZE now */ | |
| 64 | mfspr r4,SPRN_HID0 | |
| 65 | rlwinm r4,r4,0,~(HID0_DOZE|HID0_NAP|HID0_SLEEP) | |
| 66 | or r4,r4,r3 | |
| 67 | isync | |
| 68 | mtspr SPRN_HID0,r4 | |
| 69 | isync | |
| 70 | ||
| 71 | mfmsr r7 | |
| 72 | oris r7,r7,MSR_WE@h | |
| 73 | ori r7,r7,MSR_EE | |
| 74 | msync | |
| 75 | mtmsr r7 | |
| 76 | isync | |
| 77 | 2: b 2b | |
| ebf714ff | 78 | #endif /* !E500MC */ |
| fc4033b2 KG |
79 | |
| 80 | /* | |
| 81 | * Return from NAP/DOZE mode, restore some CPU specific registers, | |
| 82 | * r2 containing physical address of current. | |
| 83 | * r11 points to the exception frame (physical address). | |
| 84 | * We have to preserve r10. | |
| 85 | */ | |
| 86 | _GLOBAL(power_save_ppc32_restore) | |
| 87 | lwz r9,_LINK(r11) /* interrupted in e500_idle */ | |
| 88 | stw r9,_NIP(r11) /* make it do a blr */ | |
| 89 | ||
| 90 | #ifdef CONFIG_SMP | |
| 9778b696 | 91 | CURRENT_THREAD_INFO(r12, r1) |
| fc4033b2 KG |
92 | lwz r11,TI_CPU(r12) /* get cpu number * 4 */ |
| 93 | slwi r11,r11,2 | |
| 94 | #else | |
| 95 | li r11,0 | |
| 96 | #endif | |
| 7888bc2b | 97 | |
| fc4033b2 | 98 | b transfer_to_handler_cont |