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u-boot/arch/arm/cpu/armv7/psci.S
Peng Fan fea7452c15 armv7: psci: cpu_off: flush D-Cache before disable D-Cache 
Before disable cache, need to first flush cache.

There maybe dirty data in D-Cache before disable D-Cache.
After disable D-Cache, the first store instructions in
psci_v7_flush_dcache_all will directly store registers
{r4-r5, r7, r9-r11, lr} to memory.
If there is dirty data before disable D-Cache,
psci_v7_flush_dcache_all will flush data to memory,
and may overwrite the memory that hold the registers
{r4-r5, r7, r9-r11, lr}.

So before disable cache, first flush D-Cache.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Hongbo Zhang <hongbo.zhang@nxp.com>
Cc: York Sun <york.sun@nxp.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Tom Rini <trini@konsulko.com>
2016-11-29 08:15:31 -05:00

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/*
* Copyright (C) 2013,2014 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <linux/linkage.h>
#include <asm/macro.h>
#include <asm/psci.h>
.pushsection ._secure.text, "ax"
.arch_extension sec
.align 5
.globl _psci_vectors
_psci_vectors:
b default_psci_vector @ reset
b default_psci_vector @ undef
b _smc_psci @ smc
b default_psci_vector @ pabort
b default_psci_vector @ dabort
b default_psci_vector @ hyp
b default_psci_vector @ irq
b psci_fiq_enter @ fiq
ENTRY(psci_fiq_enter)
movs pc, lr
ENDPROC(psci_fiq_enter)
.weak psci_fiq_enter
ENTRY(default_psci_vector)
movs pc, lr
ENDPROC(default_psci_vector)
.weak default_psci_vector
ENTRY(psci_version)
ENTRY(psci_cpu_suspend)
ENTRY(psci_cpu_off)
ENTRY(psci_cpu_on)
ENTRY(psci_affinity_info)
ENTRY(psci_migrate)
ENTRY(psci_migrate_info_type)
ENTRY(psci_migrate_info_up_cpu)
ENTRY(psci_system_off)
ENTRY(psci_system_reset)
ENTRY(psci_features)
ENTRY(psci_cpu_freeze)
ENTRY(psci_cpu_default_suspend)
ENTRY(psci_node_hw_state)
ENTRY(psci_system_suspend)
ENTRY(psci_set_suspend_mode)
ENTRY(psi_stat_residency)
ENTRY(psci_stat_count)
mov r0, #ARM_PSCI_RET_NI @ Return -1 (Not Implemented)
mov pc, lr
ENDPROC(psci_stat_count)
ENDPROC(psi_stat_residency)
ENDPROC(psci_set_suspend_mode)
ENDPROC(psci_system_suspend)
ENDPROC(psci_node_hw_state)
ENDPROC(psci_cpu_default_suspend)
ENDPROC(psci_cpu_freeze)
ENDPROC(psci_features)
ENDPROC(psci_system_reset)
ENDPROC(psci_system_off)
ENDPROC(psci_migrate_info_up_cpu)
ENDPROC(psci_migrate_info_type)
ENDPROC(psci_migrate)
ENDPROC(psci_affinity_info)
ENDPROC(psci_cpu_on)
ENDPROC(psci_cpu_off)
ENDPROC(psci_cpu_suspend)
ENDPROC(psci_version)
.weak psci_version
.weak psci_cpu_suspend
.weak psci_cpu_off
.weak psci_cpu_on
.weak psci_affinity_info
.weak psci_migrate
.weak psci_migrate_info_type
.weak psci_migrate_info_up_cpu
.weak psci_system_off
.weak psci_system_reset
.weak psci_features
.weak psci_cpu_freeze
.weak psci_cpu_default_suspend
.weak psci_node_hw_state
.weak psci_system_suspend
.weak psci_set_suspend_mode
.weak psi_stat_residency
.weak psci_stat_count
_psci_table:
.word ARM_PSCI_FN_CPU_SUSPEND
.word psci_cpu_suspend
.word ARM_PSCI_FN_CPU_OFF
.word psci_cpu_off
.word ARM_PSCI_FN_CPU_ON
.word psci_cpu_on
.word ARM_PSCI_FN_MIGRATE
.word psci_migrate
.word ARM_PSCI_0_2_FN_PSCI_VERSION
.word psci_version
.word ARM_PSCI_0_2_FN_CPU_SUSPEND
.word psci_cpu_suspend
.word ARM_PSCI_0_2_FN_CPU_OFF
.word psci_cpu_off
.word ARM_PSCI_0_2_FN_CPU_ON
.word psci_cpu_on
.word ARM_PSCI_0_2_FN_AFFINITY_INFO
.word psci_affinity_info
.word ARM_PSCI_0_2_FN_MIGRATE
.word psci_migrate
.word ARM_PSCI_0_2_FN_MIGRATE_INFO_TYPE
.word psci_migrate_info_type
.word ARM_PSCI_0_2_FN_MIGRATE_INFO_UP_CPU
.word psci_migrate_info_up_cpu
.word ARM_PSCI_0_2_FN_SYSTEM_OFF
.word psci_system_off
.word ARM_PSCI_0_2_FN_SYSTEM_RESET
.word psci_system_reset
.word ARM_PSCI_1_0_FN_PSCI_FEATURES
.word psci_features
.word ARM_PSCI_1_0_FN_CPU_FREEZE
.word psci_cpu_freeze
.word ARM_PSCI_1_0_FN_CPU_DEFAULT_SUSPEND
.word psci_cpu_default_suspend
.word ARM_PSCI_1_0_FN_NODE_HW_STATE
.word psci_node_hw_state
.word ARM_PSCI_1_0_FN_SYSTEM_SUSPEND
.word psci_system_suspend
.word ARM_PSCI_1_0_FN_SET_SUSPEND_MODE
.word psci_set_suspend_mode
.word ARM_PSCI_1_0_FN_STAT_RESIDENCY
.word psi_stat_residency
.word ARM_PSCI_1_0_FN_STAT_COUNT
.word psci_stat_count
.word 0
.word 0
_smc_psci:
push {r4-r7,lr}
@ Switch to secure
mrc p15, 0, r7, c1, c1, 0
bic r4, r7, #1
mcr p15, 0, r4, c1, c1, 0
isb
adr r4, _psci_table
1: ldr r5, [r4] @ Load PSCI function ID
ldr r6, [r4, #4] @ Load target PC
cmp r5, #0 @ If reach the end, bail out
moveq r0, #ARM_PSCI_RET_INVAL @ Return -2 (Invalid)
beq 2f
cmp r0, r5 @ If not matching, try next entry
addne r4, r4, #8
bne 1b
blx r6 @ Execute PSCI function
@ Switch back to non-secure
2: mcr p15, 0, r7, c1, c1, 0
pop {r4-r7, lr}
movs pc, lr @ Return to the kernel
@ Requires dense and single-cluster CPU ID space
ENTRY(psci_get_cpu_id)
mrc p15, 0, r0, c0, c0, 5 /* read MPIDR */
and r0, r0, #0xff /* return CPU ID in cluster */
bx lr
ENDPROC(psci_get_cpu_id)
.weak psci_get_cpu_id
/* Imported from Linux kernel */
ENTRY(psci_v7_flush_dcache_all)
stmfd sp!, {r4-r5, r7, r9-r11, lr}
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
ldmfd sp!, {r4-r5, r7, r9-r11, lr}
bx lr
ENDPROC(psci_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_enable_smp)
mrc p15, 0, r0, c1, c0, 1 @ ACTLR
orr r0, r0, #(1 << 6) @ Set SMP bit
mcr p15, 0, r0, c1, c0, 1 @ ACTLR
isb
bx lr
ENDPROC(psci_enable_smp)
.weak psci_enable_smp
ENTRY(psci_cpu_off_common)
push {lr}
bl psci_v7_flush_dcache_all
clrex @ Why???
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 psci_v7_flush_dcache_all
clrex @ Why???
bl psci_disable_smp
pop {lr}
bx lr
ENDPROC(psci_cpu_off_common)
@ The stacks are allocated in reverse order, i.e.
@ the stack for CPU0 has the highest memory address.
@
@ -------------------- __secure_stack_end
@ | CPU0 target PC |
@ |------------------|
@ | |
@ | CPU0 stack |
@ | |
@ |------------------| __secure_stack_end - 1KB
@ | . |
@ | . |
@ | . |
@ | . |
@ -------------------- __secure_stack_start
@
@ This expects CPU ID in r0 and returns stack top in r0
LENTRY(psci_get_cpu_stack_top)
@ stack top = __secure_stack_end - (cpuid << ARM_PSCI_STACK_SHIFT)
ldr r3, =__secure_stack_end
sub r0, r3, r0, LSL #ARM_PSCI_STACK_SHIFT
sub r0, r0, #4 @ Save space for target PC
bx lr
ENDPROC(psci_get_cpu_stack_top)
@ {r0, r1, r2, ip} from _do_nonsec_entry(kernel_entry, 0, machid, r2) in
@ arch/arm/lib/bootm.c:boot_jump_linux() must remain unchanged across
@ this function.
ENTRY(psci_stack_setup)
mov r6, lr
mov r7, r0
bl psci_get_cpu_id @ CPU ID => r0
bl psci_get_cpu_stack_top @ stack top => r0
mov sp, r0
mov r0, r7
bx r6
ENDPROC(psci_stack_setup)
ENTRY(psci_arch_init)
mov pc, lr
ENDPROC(psci_arch_init)
.weak psci_arch_init
ENTRY(psci_cpu_entry)
bl psci_enable_smp
bl _nonsec_init
bl psci_get_cpu_id @ CPU ID => r0
bl psci_get_target_pc @ target PC => r0
b _do_nonsec_entry
ENDPROC(psci_cpu_entry)
.popsection
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