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[PATCH] ppc32: Fix errata for some G3 CPUs

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Some G3 CPUs can crash in funny way if a store from an FPU register
instruction is executed on a register that has never been initialized since
power on.  This patch fixes it by making sure all FP registers have been
properly initialized at kernel boot and when waking from sleep.  It also makes
the code that decides wether HID0_BTIC and HID0_DPM are allowed on a given CPU
smarter (it can actually _clear_ them now if they are not allowed instead of
just setting them when they are allowed in case the firmware got them wrong)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Benjamin Herrenschmidt 2005-05-01 08:58:40 -07:00 committed by Linus Torvalds
parent b207a290ea
commit f1c55dea0b
2 changed files with 40 additions and 6 deletions
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40
arch/ppc/kernel/cpu_setup_6xx.S
View File

@ -30,12 +30,14 @@ _GLOBAL(__setup_cpu_604)
blr
_GLOBAL(__setup_cpu_750)
mflr r4
bl __init_fpu_registers
bl setup_common_caches
bl setup_750_7400_hid0
mtlr r4
blr
_GLOBAL(__setup_cpu_750cx)
mflr r4
bl __init_fpu_registers
bl setup_common_caches
bl setup_750_7400_hid0
bl setup_750cx
@ -43,6 +45,7 @@ _GLOBAL(__setup_cpu_750cx)
blr
_GLOBAL(__setup_cpu_750fx)
mflr r4
bl __init_fpu_registers
bl setup_common_caches
bl setup_750_7400_hid0
bl setup_750fx
@ -50,6 +53,7 @@ _GLOBAL(__setup_cpu_750fx)
blr
_GLOBAL(__setup_cpu_7400)
mflr r4
bl __init_fpu_registers
bl setup_7400_workarounds
bl setup_common_caches
bl setup_750_7400_hid0
@ -57,6 +61,7 @@ _GLOBAL(__setup_cpu_7400)
blr
_GLOBAL(__setup_cpu_7410)
mflr r4
bl __init_fpu_registers
bl setup_7410_workarounds
bl setup_common_caches
bl setup_750_7400_hid0
@ -152,9 +157,13 @@ setup_7410_workarounds:
setup_750_7400_hid0:
mfspr r11,SPRN_HID0
ori r11,r11,HID0_SGE | HID0_ABE | HID0_BHTE | HID0_BTIC
oris r11,r11,HID0_DPM@h
BEGIN_FTR_SECTION
oris r11,r11,HID0_DPM@h /* enable dynamic power mgmt */
END_FTR_SECTION_IFCLR(CPU_FTR_NO_DPM)
xori r11,r11,HID0_BTIC
END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
BEGIN_FTR_SECTION
xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */
END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
li r3,HID0_SPD
andc r11,r11,r3 /* clear SPD: enable speculative */
li r3,0
@ -218,13 +227,15 @@ setup_745x_specifics:
/* All of the bits we have to set.....
*/
ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE | HID0_LRSTK | HID0_BTIC
ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE
ori r11,r11,HID0_LRSTK | HID0_BTIC
oris r11,r11,HID0_DPM@h
BEGIN_FTR_SECTION
xori r11,r11,HID0_BTIC
END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
BEGIN_FTR_SECTION
oris r11,r11,HID0_DPM@h /* enable dynamic power mgmt */
END_FTR_SECTION_IFCLR(CPU_FTR_NO_DPM)
xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */
END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
/* All of the bits we have to clear....
*/
@ -248,6 +259,25 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NO_DPM)
isync
blr
/*
* Initialize the FPU registers. This is needed to work around an errata
* in some 750 cpus where using a not yet initialized FPU register after
* power on reset may hang the CPU
*/
_GLOBAL(__init_fpu_registers)
mfmsr r10
ori r11,r10,MSR_FP
mtmsr r11
isync
addis r9,r3,empty_zero_page@ha
addi r9,r9,empty_zero_page@l
REST_32FPRS(0,r9)
sync
mtmsr r10
isync
blr
/* Definitions for the table use to save CPU states */
#define CS_HID0 0
#define CS_HID1 4

4
arch/ppc/platforms/pmac_sleep.S
View File

@ -267,6 +267,10 @@ grackle_wake_up:
/* Restore various CPU config stuffs */
bl __restore_cpu_setup
/* Make sure all FPRs have been initialized */
bl reloc_offset
bl __init_fpu_registers
/* Invalidate & enable L1 cache, we don't care about
* whatever the ROM may have tried to write to memory
*/