From: <Claudiu.Beznea@microchip.com>
To: <robh+dt@kernel.org>, <mark.rutland@arm.com>,
<Nicolas.Ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
<Ludovic.Desroches@microchip.com>, <linux@armlinux.org.uk>,
<mturquette@baylibre.com>, <sboyd@kernel.org>
Cc: devicetree@vger.kernel.org, Claudiu.Beznea@microchip.com,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org
Subject: [PATCH 7/8] ARM: at91: pm: disable RC oscillator in ULP0
Date: Thu, 14 Feb 2019 15:55:01 +0000 [thread overview]
Message-ID: <1550159642-26878-8-git-send-email-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <1550159642-26878-1-git-send-email-claudiu.beznea@microchip.com>
From: Claudiu Beznea <claudiu.beznea@microchip.com>
Disable RC oscillator in ULP0 as datasheet specifies.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
arch/arm/mach-at91/pm_suspend.S | 39 +++++++++++++++++++++++++++++++++++++--
1 file changed, 37 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-at91/pm_suspend.S b/arch/arm/mach-at91/pm_suspend.S
index 8b18cad1dcf5..5c33023f9129 100644
--- a/arch/arm/mach-at91/pm_suspend.S
+++ b/arch/arm/mach-at91/pm_suspend.S
@@ -178,11 +178,46 @@ ENDPROC(at91_backup_mode)
orr tmp1, tmp1, #AT91_PMC_KEY
str tmp1, [pmc, #AT91_CKGR_MOR]
+ /* Save RC oscillator state */
+ ldr tmp1, [pmc, #AT91_PMC_SR]
+ str tmp1, .saved_osc_status
+ tst tmp1, #AT91_PMC_MOSCRCS
+ bne 1f
+
+ /* Turn off RC oscillator */
+ ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ bic tmp1, tmp1, #AT91_PMC_MOSCRCEN
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ /* Wait main RC disabled done */
+2: ldr tmp1, [pmc, #AT91_PMC_SR]
+ tst tmp1, #AT91_PMC_MOSCRCS
+ bne 2b
+
/* Wait for interrupt */
- at91_cpu_idle
+1: at91_cpu_idle
- /* Turn on the crystal oscillator */
+ /* Restore RC oscillator state */
+ ldr tmp1, .saved_osc_status
+ tst tmp1, #AT91_PMC_MOSCRCS
+ beq 4f
+
+ /* Turn on RC oscillator */
ldr tmp1, [pmc, #AT91_CKGR_MOR]
+ orr tmp1, tmp1, #AT91_PMC_MOSCRCEN
+ bic tmp1, tmp1, #AT91_PMC_KEY_MASK
+ orr tmp1, tmp1, #AT91_PMC_KEY
+ str tmp1, [pmc, #AT91_CKGR_MOR]
+
+ /* Wait main RC stabilization */
+3: ldr tmp1, [pmc, #AT91_PMC_SR]
+ tst tmp1, #AT91_PMC_MOSCRCS
+ beq 3b
+
+ /* Turn on the crystal oscillator */
+4: ldr tmp1, [pmc, #AT91_CKGR_MOR]
orr tmp1, tmp1, #AT91_PMC_MOSCEN
orr tmp1, tmp1, #AT91_PMC_KEY
str tmp1, [pmc, #AT91_CKGR_MOR]
--
2.7.4
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next prev parent reply other threads:[~2019-02-14 15:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-14 15:54 [PATCH 0/8] add power management support for SAM9X60 Claudiu.Beznea
2019-02-14 15:54 ` [PATCH 1/8] ARM: at91: pm: introduce at91_soc_pm structure Claudiu.Beznea
2019-02-14 15:54 ` [PATCH 2/8] dt-bindings: arm: atmel: add binding for SAM9X60 SoC Claudiu.Beznea
2019-02-14 15:54 ` [PATCH 3/8] ARM: at91: pm: initial PM support for SAM9X60 Claudiu.Beznea
2019-02-14 15:54 ` [PATCH 4/8] ARM: at91: pm: keep at91_pm_backup_init() only for SAMA5D2 SoCs Claudiu.Beznea
2019-02-14 15:54 ` [PATCH 5/8] ARM: at91: pm: add support for per SoC wakeup source configuration Claudiu.Beznea
2019-02-14 15:54 ` [PATCH 6/8] ARM: at91: pm: add ULP1 support for SAM9X60 Claudiu.Beznea
2019-02-16 0:23 ` Stephen Boyd
2019-02-14 15:55 ` Claudiu.Beznea [this message]
2019-02-14 15:55 ` [PATCH 8/8] ARM: at91: pm: do not disable/enable PLLA for ULP modes Claudiu.Beznea
2019-02-25 10:46 ` [PATCH 0/8] add power management support for SAM9X60 Alexandre Belloni
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