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linux/arch/powerpc/kernel/cpu_setup_6xx.S
Benjamin Herrenschmidt 1f1936ff3f powerpc: Fix some 6xx/7xxx CPU setup functions 
Some of those functions try to adjust the CPU features, for example
to remove NAP support on some revisions. However, they seem to use
r5 as an index into the CPU table entry, which might have been right
a long time ago but no longer is. r4 is the right register to use.

This probably caused some off behaviours on some PowerMac variants
using 750cx or 7455 processor revisions.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: stable@kernel.org
2011-02-07 12:57:11 +11:00

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/*
* This file contains low level CPU setup functions.
* Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org)
*
* 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 <asm/processor.h>
#include <asm/page.h>
#include <asm/cputable.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/cache.h>
#include <asm/mmu.h>
_GLOBAL(__setup_cpu_603)
mflr r5
BEGIN_MMU_FTR_SECTION
li r10,0
mtspr SPRN_SPRG_603_LRU,r10 /* init SW LRU tracking */
END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
BEGIN_FTR_SECTION
bl __init_fpu_registers
END_FTR_SECTION_IFCLR(CPU_FTR_FPU_UNAVAILABLE)
bl setup_common_caches
mtlr r5
blr
_GLOBAL(__setup_cpu_604)
mflr r5
bl setup_common_caches
bl setup_604_hid0
mtlr r5
blr
_GLOBAL(__setup_cpu_750)
mflr r5
bl __init_fpu_registers
bl setup_common_caches
bl setup_750_7400_hid0
mtlr r5
blr
_GLOBAL(__setup_cpu_750cx)
mflr r5
bl __init_fpu_registers
bl setup_common_caches
bl setup_750_7400_hid0
bl setup_750cx
mtlr r5
blr
_GLOBAL(__setup_cpu_750fx)
mflr r5
bl __init_fpu_registers
bl setup_common_caches
bl setup_750_7400_hid0
bl setup_750fx
mtlr r5
blr
_GLOBAL(__setup_cpu_7400)
mflr r5
bl __init_fpu_registers
bl setup_7400_workarounds
bl setup_common_caches
bl setup_750_7400_hid0
mtlr r5
blr
_GLOBAL(__setup_cpu_7410)
mflr r5
bl __init_fpu_registers
bl setup_7410_workarounds
bl setup_common_caches
bl setup_750_7400_hid0
li r3,0
mtspr SPRN_L2CR2,r3
mtlr r5
blr
_GLOBAL(__setup_cpu_745x)
mflr r5
bl setup_common_caches
bl setup_745x_specifics
mtlr r5
blr
/* Enable caches for 603's, 604, 750 & 7400 */
setup_common_caches:
mfspr r11,SPRN_HID0
andi. r0,r11,HID0_DCE
ori r11,r11,HID0_ICE|HID0_DCE
ori r8,r11,HID0_ICFI
bne 1f /* don't invalidate the D-cache */
ori r8,r8,HID0_DCI /* unless it wasn't enabled */
1: sync
mtspr SPRN_HID0,r8 /* enable and invalidate caches */
sync
mtspr SPRN_HID0,r11 /* enable caches */
sync
isync
blr
/* 604, 604e, 604ev, ...
* Enable superscalar execution & branch history table
*/
setup_604_hid0:
mfspr r11,SPRN_HID0
ori r11,r11,HID0_SIED|HID0_BHTE
ori r8,r11,HID0_BTCD
sync
mtspr SPRN_HID0,r8 /* flush branch target address cache */
sync /* on 604e/604r */
mtspr SPRN_HID0,r11
sync
isync
blr
/* 7400 <= rev 2.7 and 7410 rev = 1.0 suffer from some
* erratas we work around here.
* Moto MPC710CE.pdf describes them, those are errata
* #3, #4 and #5
* Note that we assume the firmware didn't choose to
* apply other workarounds (there are other ones documented
* in the .pdf). It appear that Apple firmware only works
* around #3 and with the same fix we use. We may want to
* check if the CPU is using 60x bus mode in which case
* the workaround for errata #4 is useless. Also, we may
* want to explicitly clear HID0_NOPDST as this is not
* needed once we have applied workaround #5 (though it's
* not set by Apple's firmware at least).
*/
setup_7400_workarounds:
mfpvr r3
rlwinm r3,r3,0,20,31
cmpwi 0,r3,0x0207
ble 1f
blr
setup_7410_workarounds:
mfpvr r3
rlwinm r3,r3,0,20,31
cmpwi 0,r3,0x0100
bnelr
1:
mfspr r11,SPRN_MSSSR0
/* Errata #3: Set L1OPQ_SIZE to 0x10 */
rlwinm r11,r11,0,9,6
oris r11,r11,0x0100
/* Errata #4: Set L2MQ_SIZE to 1 (check for MPX mode first ?) */
oris r11,r11,0x0002
/* Errata #5: Set DRLT_SIZE to 0x01 */
rlwinm r11,r11,0,5,2
oris r11,r11,0x0800
sync
mtspr SPRN_MSSSR0,r11
sync
isync
blr
/* 740/750/7400/7410
* Enable Store Gathering (SGE), Address Brodcast (ABE),
* Branch History Table (BHTE), Branch Target ICache (BTIC)
* Dynamic Power Management (DPM), Speculative (SPD)
* Clear Instruction cache throttling (ICTC)
*/
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
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
mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */
isync
mtspr SPRN_HID0,r11
sync
isync
blr
/* 750cx specific
* Looks like we have to disable NAP feature for some PLL settings...
* (waiting for confirmation)
*/
setup_750cx:
mfspr r10, SPRN_HID1
rlwinm r10,r10,4,28,31
cmpwi cr0,r10,7
cmpwi cr1,r10,9
cmpwi cr2,r10,11
cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
cror 4*cr0+eq,4*cr0+eq,4*cr2+eq
bnelr
lwz r6,CPU_SPEC_FEATURES(r4)
li r7,CPU_FTR_CAN_NAP
andc r6,r6,r7
stw r6,CPU_SPEC_FEATURES(r4)
blr
/* 750fx specific
*/
setup_750fx:
blr
/* MPC 745x
* Enable Store Gathering (SGE), Branch Folding (FOLD)
* Branch History Table (BHTE), Branch Target ICache (BTIC)
* Dynamic Power Management (DPM), Speculative (SPD)
* Ensure our data cache instructions really operate.
* Timebase has to be running or we wouldn't have made it here,
* just ensure we don't disable it.
* Clear Instruction cache throttling (ICTC)
* Enable L2 HW prefetch
*/
setup_745x_specifics:
/* We check for the presence of an L3 cache setup by
* the firmware. If any, we disable NAP capability as
* it's known to be bogus on rev 2.1 and earlier
*/
BEGIN_FTR_SECTION
mfspr r11,SPRN_L3CR
andis. r11,r11,L3CR_L3E@h
beq 1f
END_FTR_SECTION_IFSET(CPU_FTR_L3CR)
lwz r6,CPU_SPEC_FEATURES(r4)
andi. r0,r6,CPU_FTR_L3_DISABLE_NAP
beq 1f
li r7,CPU_FTR_CAN_NAP
andc r6,r6,r7
stw r6,CPU_SPEC_FEATURES(r4)
1:
mfspr r11,SPRN_HID0
/* All of the bits we have to set.....
*/
ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE
ori r11,r11,HID0_LRSTK | HID0_BTIC
oris r11,r11,HID0_DPM@h
BEGIN_MMU_FTR_SECTION
oris r11,r11,HID0_HIGH_BAT@h
END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
BEGIN_FTR_SECTION
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)
/* All of the bits we have to clear....
*/
li r3,HID0_SPD | HID0_NOPDST | HID0_NOPTI
andc r11,r11,r3 /* clear SPD: enable speculative */
li r3,0
mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */
isync
mtspr SPRN_HID0,r11
sync
isync
/* Enable L2 HW prefetch, if L2 is enabled
*/
mfspr r3,SPRN_L2CR
andis. r3,r3,L2CR_L2E@h
beqlr
mfspr r3,SPRN_MSSCR0
ori r3,r3,3
sync
mtspr SPRN_MSSCR0,r3
sync
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
#define CS_HID2 8
#define CS_MSSCR0 12
#define CS_MSSSR0 16
#define CS_ICTRL 20
#define CS_LDSTCR 24
#define CS_LDSTDB 28
#define CS_SIZE 32
.data
.balign L1_CACHE_BYTES
cpu_state_storage:
.space CS_SIZE
.balign L1_CACHE_BYTES,0
.text
/* Called in normal context to backup CPU 0 state. This
* does not include cache settings. This function is also
* called for machine sleep. This does not include the MMU
* setup, BATs, etc... but rather the "special" registers
* like HID0, HID1, MSSCR0, etc...
*/
_GLOBAL(__save_cpu_setup)
/* Some CR fields are volatile, we back it up all */
mfcr r7
/* Get storage ptr */
lis r5,cpu_state_storage@h
ori r5,r5,cpu_state_storage@l
/* Save HID0 (common to all CONFIG_6xx cpus) */
mfspr r3,SPRN_HID0
stw r3,CS_HID0(r5)
/* Now deal with CPU type dependent registers */
mfspr r3,SPRN_PVR
srwi r3,r3,16
cmplwi cr0,r3,0x8000 /* 7450 */
cmplwi cr1,r3,0x000c /* 7400 */
cmplwi cr2,r3,0x800c /* 7410 */
cmplwi cr3,r3,0x8001 /* 7455 */
cmplwi cr4,r3,0x8002 /* 7457 */
cmplwi cr5,r3,0x8003 /* 7447A */
cmplwi cr6,r3,0x7000 /* 750FX */
cmplwi cr7,r3,0x8004 /* 7448 */
/* cr1 is 7400 || 7410 */
cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
/* cr0 is 74xx */
cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
bne 1f
/* Backup 74xx specific regs */
mfspr r4,SPRN_MSSCR0
stw r4,CS_MSSCR0(r5)
mfspr r4,SPRN_MSSSR0
stw r4,CS_MSSSR0(r5)
beq cr1,1f
/* Backup 745x specific registers */
mfspr r4,SPRN_HID1
stw r4,CS_HID1(r5)
mfspr r4,SPRN_ICTRL
stw r4,CS_ICTRL(r5)
mfspr r4,SPRN_LDSTCR
stw r4,CS_LDSTCR(r5)
mfspr r4,SPRN_LDSTDB
stw r4,CS_LDSTDB(r5)
1:
bne cr6,1f
/* Backup 750FX specific registers */
mfspr r4,SPRN_HID1
stw r4,CS_HID1(r5)
/* If rev 2.x, backup HID2 */
mfspr r3,SPRN_PVR
andi. r3,r3,0xff00
cmpwi cr0,r3,0x0200
bne 1f
mfspr r4,SPRN_HID2
stw r4,CS_HID2(r5)
1:
mtcr r7
blr
/* Called with no MMU context (typically MSR:IR/DR off) to
* restore CPU state as backed up by the previous
* function. This does not include cache setting
*/
_GLOBAL(__restore_cpu_setup)
/* Some CR fields are volatile, we back it up all */
mfcr r7
/* Get storage ptr */
lis r5,(cpu_state_storage-KERNELBASE)@h
ori r5,r5,cpu_state_storage@l
/* Restore HID0 */
lwz r3,CS_HID0(r5)
sync
isync
mtspr SPRN_HID0,r3
sync
isync
/* Now deal with CPU type dependent registers */
mfspr r3,SPRN_PVR
srwi r3,r3,16
cmplwi cr0,r3,0x8000 /* 7450 */
cmplwi cr1,r3,0x000c /* 7400 */
cmplwi cr2,r3,0x800c /* 7410 */
cmplwi cr3,r3,0x8001 /* 7455 */
cmplwi cr4,r3,0x8002 /* 7457 */
cmplwi cr5,r3,0x8003 /* 7447A */
cmplwi cr6,r3,0x7000 /* 750FX */
cmplwi cr7,r3,0x8004 /* 7448 */
/* cr1 is 7400 || 7410 */
cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
/* cr0 is 74xx */
cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
bne 2f
/* Restore 74xx specific regs */
lwz r4,CS_MSSCR0(r5)
sync
mtspr SPRN_MSSCR0,r4
sync
isync
lwz r4,CS_MSSSR0(r5)
sync
mtspr SPRN_MSSSR0,r4
sync
isync
bne cr2,1f
/* Clear 7410 L2CR2 */
li r4,0
mtspr SPRN_L2CR2,r4
1: beq cr1,2f
/* Restore 745x specific registers */
lwz r4,CS_HID1(r5)
sync
mtspr SPRN_HID1,r4
isync
sync
lwz r4,CS_ICTRL(r5)
sync
mtspr SPRN_ICTRL,r4
isync
sync
lwz r4,CS_LDSTCR(r5)
sync
mtspr SPRN_LDSTCR,r4
isync
sync
lwz r4,CS_LDSTDB(r5)
sync
mtspr SPRN_LDSTDB,r4
isync
sync
2: bne cr6,1f
/* Restore 750FX specific registers
* that is restore HID2 on rev 2.x and PLL config & switch
* to PLL 0 on all
*/
/* If rev 2.x, restore HID2 with low voltage bit cleared */
mfspr r3,SPRN_PVR
andi. r3,r3,0xff00
cmpwi cr0,r3,0x0200
bne 4f
lwz r4,CS_HID2(r5)
rlwinm r4,r4,0,19,17
mtspr SPRN_HID2,r4
sync
4:
lwz r4,CS_HID1(r5)
rlwinm r5,r4,0,16,14
mtspr SPRN_HID1,r5
/* Wait for PLL to stabilize */
mftbl r5
3: mftbl r6
sub r6,r6,r5
cmplwi cr0,r6,10000
ble 3b
/* Setup final PLL */
mtspr SPRN_HID1,r4
1:
mtcr r7
blr
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