From: Hongbo Zhang <hongbo.zh...@nxp.com>
For the robustness of codes, while powering on a CPU, it is better to check
if the target CPU is already on or in the process of power on, if yes the
power on routine shouldn't be executed further and should return with the
corresponding status immediately.
Signed-off-by: Hongbo Zhang <hongbo.zh...@nxp.com>
---
arch/arm/cpu/armv7/ls102xa/psci.S | 29 +++++++++++++++++++++++++++++
arch/arm/include/asm/psci.h | 5 +++++
2 files changed, 34 insertions(+)
diff --git a/arch/arm/cpu/armv7/ls102xa/psci.S
b/arch/arm/cpu/armv7/ls102xa/psci.S
index 9de812f..4cb960a 100644
--- a/arch/arm/cpu/armv7/ls102xa/psci.S
+++ b/arch/arm/cpu/armv7/ls102xa/psci.S
@@ -67,6 +67,22 @@ psci_cpu_on:
beq out_psci_cpu_on
mov r1, r0
+ bl psci_get_cpu_stack_top
+ sub r0, r0, #PSCI_CPU_STATUS_OFFSET
+ ldr r5, [r0]
+
+ cmp r5, #PSCI_CPU_STATUS_ON
+ moveq r0, #PSCI_RET_ALREADY_ON
+ beq out_psci_cpu_on
+
+ cmp r5, #PSCI_CPU_STATUS_ON_PENDING
+ moveq r0, #PSCI_RET_ON_PENDING
+ beq out_psci_cpu_on
+
+ mov r5, #PSCI_CPU_STATUS_ON_PENDING
+ str r5, [r0]
+ dsb
+
bl psci_cpu_on_common
@ Get DCFG base address
@@ -124,6 +140,12 @@ holdoff_release:
rev r6, r6
str r6, [r4, #DCFG_CCSR_SCRATCHRW1]
+ mov r0, r1
+ bl psci_get_cpu_stack_top
+ sub r0, r0, #PSCI_CPU_STATUS_OFFSET
+ mov r5, #PSCI_CPU_STATUS_ON
+ str r5, [r0]
+
isb
dsb
@@ -138,6 +160,13 @@ out_psci_cpu_on:
psci_cpu_off:
bl psci_cpu_off_common
+ bl psci_get_cpu_id
+ bl psci_get_cpu_stack_top
+ sub r0, r0, #PSCI_CPU_STATUS_OFFSET
+ mov r5, #PSCI_CPU_STATUS_OFF
+ str r5, [r0]
+ dsb
+
1: wfi
b 1b
diff --git a/arch/arm/include/asm/psci.h b/arch/arm/include/asm/psci.h
index 32ae359..535b77f 100644
--- a/arch/arm/include/asm/psci.h
+++ b/arch/arm/include/asm/psci.h
@@ -22,6 +22,7 @@
#define PSCI_PERCPU_STACK_SIZE 0x400
#define PSCI_TARGET_PC_OFFSET (PSCI_PERCPU_STACK_SIZE - 4)
#define PSCI_CONTEXT_ID_OFFSET (PSCI_PERCPU_STACK_SIZE - 8)
+#define PSCI_CPU_STATUS_OFFSET (PSCI_PERCPU_STACK_SIZE - 12)
/* PSCI interfaces */
#define PSCI_FN_BASE 0x84000000
@@ -47,6 +48,10 @@
#define PSCI_FN_STAT_COUNT PSCI_FN_ID(17)
+#define PSCI_CPU_STATUS_OFF 0
+#define PSCI_CPU_STATUS_ON 1
+#define PSCI_CPU_STATUS_ON_PENDING 2
+
/* PSCI return values */
#define PSCI_RET_SUCCESS 0
#define PSCI_RET_NOT_SUPPORTED (-1)
--
2.1.4
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