From: Wenyou Yang <wenyou.yang@atmel.com>
To: <nicolas.ferre@atmel.com>, <linux@maxim.org.za>,
<linux@arm.linux.org.uk>
Cc: <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <sylvain.rochet@finsecur.com>,
<alexandre.belloni@free-electrons.com>,
<patrice.vilchez@atmel.com>, <sergei.shtylyov@cogentembedded.com>,
<mark.rutland@arm.com>, <lorenzo.pieralisi@arm.com>,
<wenyou.yang@atmel.com>
Subject: [PATCH 1/3] pm: at91: pm_suspend: add the WFI instruction support for ARMv7
Date: Thu, 12 Feb 2015 10:51:26 +0800 [thread overview]
Message-ID: <1423709486-8382-1-git-send-email-wenyou.yang@atmel.com> (raw)
In-Reply-To: <1423709441-8342-1-git-send-email-wenyou.yang@atmel.com>
Add the WFI instruction to make the cpu to the idle state.
In the meanwhile, disable the processor's clock.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
---
arch/arm/mach-at91/pm_suspend.S | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index bebe3de..1c7256a 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -51,6 +51,24 @@ tmp2 .req r5
beq 1b
.endm
+/*
+ * Put the processor to enter the idle state
+ */
+ .macro at91_cpu_idle
+
+#if defined(CONFIG_CPU_V7)
+ mov tmp1, #AT91_PMC_PCK
+ str tmp1, [pmc, #AT91_PMC_SCDR]
+
+ dsb
+
+ wfi @ Wait For Interrupt
+#else
+ mcr p15, 0, tmp1, c7, c0, 4
+#endif
+
+ .endm
+
.text
/*
@@ -120,7 +138,7 @@ skip_disable_main_clock:
ldr pmc, .pmc_base
/* Wait for interrupt */
- mcr p15, 0, tmp1, c7, c0, 4
+ at91_cpu_idle
ldr r0, .pm_mode
tst r0, #AT91_PM_SLOW_CLOCK
--
1.7.9.5
next prev parent reply other threads:[~2015-02-12 2:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-12 2:50 [PATCH 0/3] AT91 pm fixes for 3.21 Wenyou Yang
2015-02-12 2:51 ` Wenyou Yang [this message]
2015-02-17 10:22 ` [PATCH 1/3] pm: at91: pm_suspend: add the WFI instruction support for ARMv7 Alexandre Belloni
2015-02-12 2:52 ` [PATCH 2/3] pm: at91: pm_suspend: MOR register KEY was missing Wenyou Yang
2015-02-17 10:24 ` Alexandre Belloni
2015-02-12 2:52 ` [PATCH 3/3] pm: at91: flush data cache and clean, invalidate and disable the L2 cache Wenyou Yang
2015-02-17 10:25 ` Alexandre Belloni
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