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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2005-05-01 18:22:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-01 18:22:34 -0700 |
| commit | 15fd56867b6b94dc829d880bc078428eb41859c8 (patch) | |
| tree | 2cadd2a246de12dade57a75cc57c296070d58712 | |
| parent | 7da21a02b3587157bd43910ea6d4c76661228ebb (diff) | |
| download | linux-15fd56867b6b94dc829d880bc078428eb41859c8.tar.gz linux-15fd56867b6b94dc829d880bc078428eb41859c8.tar.bz2 linux-15fd56867b6b94dc829d880bc078428eb41859c8.zip | |
[PATCH] ppc32: Workaround a cache flush issue on sleep
We are experiencing a problem when flushing the CPU caches before sleep
on some laptop models using the 750FX CPU rev 1.X. While I haven't been
able to figure out a proper explanation for what's going on, I do have a
workaround that seem to work reliably and allows those machine to sleep
and wakeup properly again.
I'll re-update that code if/when I ever find exactly what is happening
with those CPU revisions.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/ppc/platforms/pmac_cache.S | 54 |
1 files changed, 42 insertions, 12 deletions
diff --git a/arch/ppc/platforms/pmac_cache.S b/arch/ppc/platforms/pmac_cache.S index da34a9bc9299..fb977de6b704 100644 --- a/arch/ppc/platforms/pmac_cache.S +++ b/arch/ppc/platforms/pmac_cache.S @@ -64,27 +64,39 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) mtspr SPRN_HID0,r4 /* Disable DPM */ sync - /* disp-flush L1 */ - li r4,0x4000 - mtctr r4 + /* Disp-flush L1. We have a weird problem here that I never + * totally figured out. On 750FX, using the ROM for the flush + * results in a non-working flush. We use that workaround for + * now until I finally understand what's going on. --BenH + */ + + /* ROM base by default */ lis r4,0xfff0 -1: lwzx r0,r0,r4 + mfpvr r3 + srwi r3,r3,16 + cmplwi cr0,r3,0x7000 + bne+ 1f + /* RAM base on 750FX */ + li r4,0 +1: li r4,0x4000 + mtctr r4 +1: lwz r0,0(r4) addi r4,r4,32 bdnz 1b sync isync - /* disable / invalidate / enable L1 data */ + /* Disable / invalidate / enable L1 data */ mfspr r3,SPRN_HID0 - rlwinm r0,r0,0,~HID0_DCE + rlwinm r3,r3,0,~(HID0_DCE | HID0_ICE) mtspr SPRN_HID0,r3 sync isync - ori r3,r3,HID0_DCE|HID0_DCI + ori r3,r3,(HID0_DCE|HID0_DCI|HID0_ICE|HID0_ICFI) sync isync mtspr SPRN_HID0,r3 - xori r3,r3,HID0_DCI + xori r3,r3,(HID0_DCI|HID0_ICFI) mtspr SPRN_HID0,r3 sync @@ -110,11 +122,20 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) lis r4,2 mtctr r4 lis r4,0xfff0 -1: lwzx r0,r0,r4 +1: lwz r0,0(r4) + addi r4,r4,32 + bdnz 1b + sync + isync + lis r4,2 + mtctr r4 + lis r4,0xfff0 +1: dcbf 0,r4 addi r4,r4,32 bdnz 1b sync isync + /* now disable L2 */ rlwinm r5,r5,0,~L2CR_L2E b 2f @@ -135,6 +156,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) mtspr SPRN_L2CR,r4 sync isync + + /* Wait for the invalidation to complete */ +1: mfspr r3,SPRN_L2CR + rlwinm. r0,r3,0,31,31 + bne 1b + + /* Clear L2I */ xoris r4,r4,L2CR_L2I@h sync mtspr SPRN_L2CR,r4 @@ -142,14 +170,16 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) /* now disable the L1 data cache */ mfspr r0,SPRN_HID0 - rlwinm r0,r0,0,~HID0_DCE + rlwinm r0,r0,0,~(HID0_DCE|HID0_ICE) mtspr SPRN_HID0,r0 sync isync /* Restore HID0[DPM] to whatever it was before */ sync - mtspr SPRN_HID0,r8 + mfspr r0,SPRN_HID0 + rlwimi r0,r8,0,11,11 /* Turn back HID0[DPM] */ + mtspr SPRN_HID0,r0 sync /* restore DR and EE */ @@ -201,7 +231,7 @@ flush_disable_745x: mtctr r4 li r4,0 1: - lwzx r0,r0,r4 + lwz r0,0(r4) addi r4,r4,32 /* Go to start of next cache line */ bdnz 1b isync |