diff options
Diffstat (limited to 'arch/ppc/kernel/idle_6xx.S')
| -rw-r--r-- | arch/ppc/kernel/idle_6xx.S | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/arch/ppc/kernel/idle_6xx.S b/arch/ppc/kernel/idle_6xx.S deleted file mode 100644 index 1a2194cf682..00000000000 --- a/arch/ppc/kernel/idle_6xx.S +++ /dev/null @@ -1,233 +0,0 @@ -/* - * This file contains the power_save function for 6xx & 7xxx CPUs - * rewritten in assembler - * - * Warning ! This code assumes that if your machine has a 750fx - * it will have PLL 1 set to low speed mode (used during NAP/DOZE). - * if this is not the case some additional changes will have to - * be done to check a runtime var (a bit like powersave-nap) - * - * 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 <linux/config.h> -#include <linux/threads.h> -#include <asm/processor.h> -#include <asm/page.h> -#include <asm/cputable.h> -#include <asm/thread_info.h> -#include <asm/ppc_asm.h> -#include <asm/asm-offsets.h> - -#undef DEBUG - - .text - -/* - * Init idle, called at early CPU setup time from head.S for each CPU - * Make sure no rest of NAP mode remains in HID0, save default - * values for some CPU specific registers. Called with r24 - * containing CPU number and r3 reloc offset - */ -_GLOBAL(init_idle_6xx) -BEGIN_FTR_SECTION - mfspr r4,SPRN_HID0 - rlwinm r4,r4,0,10,8 /* Clear NAP */ - mtspr SPRN_HID0, r4 - b 1f -END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) - blr -1: - slwi r5,r24,2 - add r5,r5,r3 -BEGIN_FTR_SECTION - mfspr r4,SPRN_MSSCR0 - addis r6,r5, nap_save_msscr0@ha - stw r4,nap_save_msscr0@l(r6) -END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR) -BEGIN_FTR_SECTION - mfspr r4,SPRN_HID1 - addis r6,r5,nap_save_hid1@ha - stw r4,nap_save_hid1@l(r6) -END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX) - blr - -/* - * Here is the power_save_6xx function. This could eventually be - * split into several functions & changing the function pointer - * depending on the various features. - */ -_GLOBAL(ppc6xx_idle) - /* Check if we can nap or doze, put HID0 mask in r3 - */ - lis r3, 0 -BEGIN_FTR_SECTION - lis r3,HID0_DOZE@h -END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) -BEGIN_FTR_SECTION - /* We must dynamically check for the NAP feature as it - * can be cleared by CPU init after the fixups are done - */ - lis r4,cur_cpu_spec@ha - lwz r4,cur_cpu_spec@l(r4) - lwz r4,CPU_SPEC_FEATURES(r4) - andi. r0,r4,CPU_FTR_CAN_NAP - beq 1f - /* Now check if user or arch enabled NAP mode */ - lis r4,powersave_nap@ha - lwz r4,powersave_nap@l(r4) - cmpwi 0,r4,0 - beq 1f - lis r3,HID0_NAP@h -1: -END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) - cmpwi 0,r3,0 - beqlr - - /* Clear MSR:EE */ - mfmsr r7 - rlwinm r0,r7,0,17,15 - mtmsr r0 - - /* Check current_thread_info()->flags */ - rlwinm r4,r1,0,0,18 - lwz r4,TI_FLAGS(r4) - andi. r0,r4,_TIF_NEED_RESCHED - beq 1f - mtmsr r7 /* out of line this ? */ - blr -1: - /* Some pre-nap cleanups needed on some CPUs */ - andis. r0,r3,HID0_NAP@h - beq 2f -BEGIN_FTR_SECTION - /* Disable L2 prefetch on some 745x and try to ensure - * L2 prefetch engines are idle. As explained by errata - * text, we can't be sure they are, we just hope very hard - * that well be enough (sic !). At least I noticed Apple - * doesn't even bother doing the dcbf's here... - */ - mfspr r4,SPRN_MSSCR0 - rlwinm r4,r4,0,0,29 - sync - mtspr SPRN_MSSCR0,r4 - sync - isync - lis r4,KERNELBASE@h - dcbf 0,r4 - dcbf 0,r4 - dcbf 0,r4 - dcbf 0,r4 -END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR) -#ifdef DEBUG - lis r6,nap_enter_count@ha - lwz r4,nap_enter_count@l(r6) - addi r4,r4,1 - stw r4,nap_enter_count@l(r6) -#endif -2: -BEGIN_FTR_SECTION - /* Go to low speed mode on some 750FX */ - lis r4,powersave_lowspeed@ha - lwz r4,powersave_lowspeed@l(r4) - cmpwi 0,r4,0 - beq 1f - mfspr r4,SPRN_HID1 - oris r4,r4,0x0001 - mtspr SPRN_HID1,r4 -1: -END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX) - - /* Go to NAP or DOZE now */ - mfspr r4,SPRN_HID0 - lis r5,(HID0_NAP|HID0_SLEEP)@h -BEGIN_FTR_SECTION - oris r5,r5,HID0_DOZE@h -END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) - andc r4,r4,r5 - or r4,r4,r3 -BEGIN_FTR_SECTION - oris r4,r4,HID0_DPM@h /* that should be done once for all */ -END_FTR_SECTION_IFCLR(CPU_FTR_NO_DPM) - mtspr SPRN_HID0,r4 -BEGIN_FTR_SECTION - DSSALL - sync -END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) - ori r7,r7,MSR_EE /* Could be ommited (already set) */ - oris r7,r7,MSR_POW@h - sync - isync - mtmsr r7 - isync - sync - blr - -/* - * Return from NAP/DOZE mode, restore some CPU specific registers, - * we are called with DR/IR still off and r2 containing physical - * address of current. - */ -_GLOBAL(power_save_6xx_restore) - mfspr r11,SPRN_HID0 - rlwinm. r11,r11,0,10,8 /* Clear NAP & copy NAP bit !state to cr1 EQ */ - cror 4*cr1+eq,4*cr0+eq,4*cr0+eq -BEGIN_FTR_SECTION - rlwinm r11,r11,0,9,7 /* Clear DOZE */ -END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE) - mtspr SPRN_HID0, r11 - -#ifdef DEBUG - beq cr1,1f - lis r11,(nap_return_count-KERNELBASE)@ha - lwz r9,nap_return_count@l(r11) - addi r9,r9,1 - stw r9,nap_return_count@l(r11) -1: -#endif - - rlwinm r9,r1,0,0,18 - tophys(r9,r9) - lwz r11,TI_CPU(r9) - slwi r11,r11,2 - /* Todo make sure all these are in the same page - * and load r22 (@ha part + CPU offset) only once - */ -BEGIN_FTR_SECTION - beq cr1,1f - addis r9,r11,(nap_save_msscr0-KERNELBASE)@ha - lwz r9,nap_save_msscr0@l(r9) - mtspr SPRN_MSSCR0, r9 - sync - isync -1: -END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR) -BEGIN_FTR_SECTION - addis r9,r11,(nap_save_hid1-KERNELBASE)@ha - lwz r9,nap_save_hid1@l(r9) - mtspr SPRN_HID1, r9 -END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX) - b transfer_to_handler_cont - - .data - -_GLOBAL(nap_save_msscr0) - .space 4*NR_CPUS - -_GLOBAL(nap_save_hid1) - .space 4*NR_CPUS - -_GLOBAL(powersave_nap) - .long 0 -_GLOBAL(powersave_lowspeed) - .long 0 - -#ifdef DEBUG -_GLOBAL(nap_enter_count) - .space 4 -_GLOBAL(nap_return_count) - .space 4 -#endif |