linux-kernel - [PATCH v6 2/6] ARM: at91: pm: Create a procedure for the ULP0 mode

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Date:	Mon, 8 Aug 2016 18:05:01 +0800
From:	Wenyou Yang <wenyou.yang@...el.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Russell King <linux@....linux.org.uk>
CC:	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-clk@...r.kernel.org>, "Rob Herring" <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Brown <broonie@...nel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"Kumar Gala" <galak@...eaurora.org>,
	Wenyou Yang <wenyou.yang@...el.com>
Subject: [PATCH v6 2/6] ARM: at91: pm: Create a procedure for the ULP0 mode

To make the code more legible and prepare to add the ULP1 mode
support in the future, create a separate procedure for the ULP0 mode.

Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---

Changes in v6:
 - Add Acked-by tag.

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 arch/arm/mach-at91/pm_suspend.S | 65 +++++++++++++++++++++++++----------------
 1 file changed, 40 insertions(+), 25 deletions(-)

diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index a25defd..5fcffdc 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -107,7 +107,7 @@ ENTRY(at91_pm_suspend_in_sram)
 
 	ldr	r0, .pm_mode
 	tst	r0, #AT91_PM_SLOW_CLOCK
-	beq	skip_disable_main_clock
+	beq	standby_mode
 
 	ldr	pmc, .pmc_base
 
@@ -131,32 +131,13 @@ ENTRY(at91_pm_suspend_in_sram)
 	orr	tmp1, tmp1, #(1 << 29)		/* bit 29 always set */
 	str	tmp1, [pmc, #AT91_CKGR_PLLAR]
 
-	/* Turn off the main oscillator */
-	ldr	tmp1, [pmc, #AT91_CKGR_MOR]
-	bic	tmp1, tmp1, #AT91_PMC_MOSCEN
-	orr	tmp1, tmp1, #AT91_PMC_KEY
-	str	tmp1, [pmc, #AT91_CKGR_MOR]
-
-skip_disable_main_clock:
-	ldr	pmc, .pmc_base
-
-	/* Wait for interrupt */
-	at91_cpu_idle
-
-	ldr	r0, .pm_mode
-	tst	r0, #AT91_PM_SLOW_CLOCK
-	beq	skip_enable_main_clock
+ulp0_mode:
+	bl	at91_pm_ulp0_mode
+	b	ulp_exit
 
+ulp_exit:
 	ldr	pmc, .pmc_base
 
-	/* Turn on the main oscillator */
-	ldr	tmp1, [pmc, #AT91_CKGR_MOR]
-	orr	tmp1, tmp1, #AT91_PMC_MOSCEN
-	orr	tmp1, tmp1, #AT91_PMC_KEY
-	str	tmp1, [pmc, #AT91_CKGR_MOR]
-
-	wait_moscrdy
-
 	/* Restore PLLA setting */
 	ldr	tmp1, .saved_pllar
 	str	tmp1, [pmc, #AT91_CKGR_PLLAR]
@@ -177,7 +158,15 @@ skip_disable_main_clock:
 
 	wait_mckrdy
 
-skip_enable_main_clock:
+	b	pm_exit
+
+standby_mode:
+	ldr	pmc, .pmc_base
+
+	/* Wait for interrupt */
+	at91_cpu_idle
+
+pm_exit:
 	/* Exit the self-refresh mode */
 	mov	r0, #SRAMC_SELF_FRESH_EXIT
 	bl	at91_sramc_self_refresh
@@ -311,6 +300,32 @@ exit_sramc_sf:
 	mov	pc, lr
 ENDPROC(at91_sramc_self_refresh)
 
+/*
+ * void at91_pm_ulp0_mode(void)
+ */
+ENTRY(at91_pm_ulp0_mode)
+	ldr	pmc, .pmc_base
+
+	/* Turn off the crystal oscillator */
+	ldr	tmp1, [pmc, #AT91_CKGR_MOR]
+	bic	tmp1, tmp1, #AT91_PMC_MOSCEN
+	orr	tmp1, tmp1, #AT91_PMC_KEY
+	str	tmp1, [pmc, #AT91_CKGR_MOR]
+
+	/* Wait for interrupt */
+	at91_cpu_idle
+
+	/* Turn on the crystal oscillator */
+	ldr	tmp1, [pmc, #AT91_CKGR_MOR]
+	orr	tmp1, tmp1, #AT91_PMC_MOSCEN
+	orr	tmp1, tmp1, #AT91_PMC_KEY
+	str	tmp1, [pmc, #AT91_CKGR_MOR]
+
+	wait_moscrdy
+
+	mov	pc, lr
+ENDPROC(at91_pm_ulp0_mode)
+
 .pmc_base:
 	.word 0
 .sramc_base:
-- 
2.7.4