Hello.
On 1/26/2015 1:06 PM, Wenyou Yang wrote:
Signed-off-by: Wenyou Yang <[email protected]>
---
arch/arm/mach-at91/pm_suspend.S | 54 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 53 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index 122a3f1..e796722 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -53,6 +53,58 @@ mode .req r6
beq 1b
.endm
+/*
+ * Put the processor to enter the WFI state
+ */
+ .macro _do_wfi
+
+#if defined(CONFIG_CPU_V7)
+ /*
+ * Execute an ISB instruction to flush the pipeline to ensure
+ * that all of operations have beem completed.
Been.
+ */
+ isb
+
+ /*
+ * Execute an ISB instruction to ensure that all of the
ISB again, while you're executing DSB/DMB?
+ * CP15 register changes have been committed.
+ */
+ dsb
+ dmb
+
+ /* Disable the processor's clock */
+ mov tmp1, #AT91_PMC_PCK
What's 'tmp1'? Is that a register name?
+ str tmp1, [pmc, #AT91_PMC_SCDR]
+
+ /* Execute a WFI instruction */
Self-obvious comment, I'd say...
+ wfi @ Wait For Interrupt
+
+ /*
+ * CPU can specualatively prefetch the instructions
Speculatively.
[...]
WBR, Sergei
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