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ARM: Factor out reusable psci_cpu_off_common

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Move parts of sunxi's psci_cpu_off into psci_cpu_off_common, namely
cache disabling and flushing, clrex and the disabling of SMP for the
dying CPU. These steps are apparently generic for ARMv7 and will be
reused for Tegra124 support.

As the way of disabled SMP is not architectural, though commonly done
via ACLTR, the related function can be overloaded.

CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Jan Kiszka 2015-04-21 07:18:27 +02:00 committed by Tom Warren
parent 680f396851
commit b0206e7d26
2 changed files with 78 additions and 62 deletions
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77
arch/arm/cpu/armv7/psci.S
View File

@ -107,4 +107,81 @@ ENTRY(psci_get_cpu_id)
ENDPROC(psci_get_cpu_id)
.weak psci_get_cpu_id
/* Imported from Linux kernel */
LENTRY(v7_flush_dcache_all)
dmb @ ensure ordering with previous memory accesses
mrc p15, 1, r0, c0, c0, 1 @ read clidr
ands r3, r0, #0x7000000 @ extract loc from clidr
mov r3, r3, lsr #23 @ left align loc bit field
beq finished @ if loc is 0, then no need to clean
mov r10, #0 @ start clean at cache level 0
flush_levels:
add r2, r10, r10, lsr #1 @ work out 3x current cache level
mov r1, r0, lsr r2 @ extract cache type bits from clidr
and r1, r1, #7 @ mask of the bits for current cache only
cmp r1, #2 @ see what cache we have at this level
blt skip @ skip if no cache, or just i-cache
mrs r9, cpsr @ make cssr&csidr read atomic
mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
isb @ isb to sych the new cssr&csidr
mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
msr cpsr_c, r9
and r2, r1, #7 @ extract the length of the cache lines
add r2, r2, #4 @ add 4 (line length offset)
ldr r4, =0x3ff
ands r4, r4, r1, lsr #3 @ find maximum number on the way size
clz r5, r4 @ find bit position of way size increment
ldr r7, =0x7fff
ands r7, r7, r1, lsr #13 @ extract max number of the index size
loop1:
mov r9, r7 @ create working copy of max index
loop2:
orr r11, r10, r4, lsl r5 @ factor way and cache number into r11
orr r11, r11, r9, lsl r2 @ factor index number into r11
mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
subs r9, r9, #1 @ decrement the index
bge loop2
subs r4, r4, #1 @ decrement the way
bge loop1
skip:
add r10, r10, #2 @ increment cache number
cmp r3, r10
bgt flush_levels
finished:
mov r10, #0 @ swith back to cache level 0
mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
dsb st
isb
bx lr
ENDPROC(v7_flush_dcache_all)
ENTRY(psci_disable_smp)
mrc p15, 0, r0, c1, c0, 1 @ ACTLR
bic r0, r0, #(1 << 6) @ Clear SMP bit
mcr p15, 0, r0, c1, c0, 1 @ ACTLR
isb
dsb
bx lr
ENDPROC(psci_disable_smp)
.weak psci_disable_smp
ENTRY(psci_cpu_off_common)
push {lr}
mrc p15, 0, r0, c1, c0, 0 @ SCTLR
bic r0, r0, #(1 << 2) @ Clear C bit
mcr p15, 0, r0, c1, c0, 0 @ SCTLR
isb
dsb
bl v7_flush_dcache_all
clrex @ Why???
bl psci_disable_smp
pop {lr}
bx lr
ENDPROC(psci_cpu_off_common)
.popsection

63
arch/arm/cpu/armv7/sunxi/psci.S
View File

@ -200,53 +200,6 @@ psci_cpu_on:
_target_pc:
.word 0
/* Imported from Linux kernel */
v7_flush_dcache_all:
dmb @ ensure ordering with previous memory accesses
mrc p15, 1, r0, c0, c0, 1 @ read clidr
ands r3, r0, #0x7000000 @ extract loc from clidr
mov r3, r3, lsr #23 @ left align loc bit field
beq finished @ if loc is 0, then no need to clean
mov r10, #0 @ start clean at cache level 0
flush_levels:
add r2, r10, r10, lsr #1 @ work out 3x current cache level
mov r1, r0, lsr r2 @ extract cache type bits from clidr
and r1, r1, #7 @ mask of the bits for current cache only
cmp r1, #2 @ see what cache we have at this level
blt skip @ skip if no cache, or just i-cache
mrs r9, cpsr @ make cssr&csidr read atomic
mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
isb @ isb to sych the new cssr&csidr
mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
msr cpsr_c, r9
and r2, r1, #7 @ extract the length of the cache lines
add r2, r2, #4 @ add 4 (line length offset)
ldr r4, =0x3ff
ands r4, r4, r1, lsr #3 @ find maximum number on the way size
clz r5, r4 @ find bit position of way size increment
ldr r7, =0x7fff
ands r7, r7, r1, lsr #13 @ extract max number of the index size
loop1:
mov r9, r7 @ create working copy of max index
loop2:
orr r11, r10, r4, lsl r5 @ factor way and cache number into r11
orr r11, r11, r9, lsl r2 @ factor index number into r11
mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
subs r9, r9, #1 @ decrement the index
bge loop2
subs r4, r4, #1 @ decrement the way
bge loop1
skip:
add r10, r10, #2 @ increment cache number
cmp r3, r10
bgt flush_levels
finished:
mov r10, #0 @ swith back to cache level 0
mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
dsb st
isb
bx lr
_sunxi_cpu_entry:
@ Set SMP bit
mrc p15, 0, r0, c1, c0, 1
@ -262,21 +215,7 @@ _sunxi_cpu_entry:
.globl psci_cpu_off
psci_cpu_off:
mrc p15, 0, r0, c1, c0, 0 @ SCTLR
bic r0, r0, #(1 << 2) @ Clear C bit
mcr p15, 0, r0, c1, c0, 0 @ SCTLR
isb
dsb
bl v7_flush_dcache_all
clrex @ Why???
mrc p15, 0, r0, c1, c0, 1 @ ACTLR
bic r0, r0, #(1 << 6) @ Clear SMP bit
mcr p15, 0, r0, c1, c0, 1 @ ACTLR
isb
dsb
bl psci_cpu_off_common
@ Ask CPU0 to pull the rug...
movw r0, #(GICD_BASE & 0xffff)