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From: Chanwoo Choi <cw00.choi@samsung.com>
To: linux-kernel@vger.kernel.org
Cc: linux@arm.linux.org.uk, ben-linux@fluff.org,
	kgene.kim@samsung.com, t.figa@samsung.com, arnd@arndb.de,
	olof@lixom.net, marc.zyngier@arm.com, thomas.abraham@linaro.org,
	kyungmin.park@samsung.com, cw00.choi@samsung.com,
	sw0312.kim@samsung.com, hyunhee.kim@samsung.com,
	yj44.cho@samsung.com, chanho61.park@samsung.com,
	sajjan.linux@gmail.com, tushar.behera@linaro.org,
	sachin.kamat@linaro.org, linux-samsung-soc@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org
Subject: [PATCHv3 4/7] ARM: EXYNOS: Enter a15 lowpower mode for Exynos3250 based on Cortex-a7
Date: Fri, 18 Apr 2014 10:15:25 +0900	[thread overview]
Message-ID: <1397783728-6193-5-git-send-email-cw00.choi@samsung.com> (raw)
In-Reply-To: <1397783728-6193-1-git-send-email-cw00.choi@samsung.com>

This patch decide proper lowpower mode of either a15 or a9 according to own ID
from Main ID register.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Marc Zynigier <marc.zyngier@arm.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 arch/arm/mach-exynos/hotplug.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index 5eead53..acf3119 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -135,16 +135,21 @@ void __ref exynos_cpu_die(unsigned int cpu)
 	int primary_part = 0;
 
 	/*
-	 * we're ready for shutdown now, so do it.
-	 * Exynos4 is A9 based while Exynos5 is A15; check the CPU part
-	 * number by reading the Main ID register and then perform the
-	 * appropriate sequence for entering low power.
+	 * Prepare the CPU for shutting down. The required sequence of
+	 * operations depends on core type. CPUID part number can be used to
+	 * determine the right way.
 	 */
-	asm("mrc p15, 0, %0, c0, c0, 0" : "=r"(primary_part) : : "cc");
-	if ((primary_part & 0xfff0) == 0xc0f0)
+	primary_part = read_cpuid_part_number();
+
+	switch (primary_part) {
+	case ARM_CPU_PART_CORTEX_A7:
+	case ARM_CPU_PART_CORTEX_A15:
 		cpu_enter_lowpower_a15();
-	else
+		break;
+	default:
 		cpu_enter_lowpower_a9();
+		break;
+	}
 
 	platform_do_lowpower(cpu, &spurious);
 
-- 
1.8.0


WARNING: multiple messages have this Message-ID (diff)
From: cw00.choi@samsung.com (Chanwoo Choi)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCHv3 4/7] ARM: EXYNOS: Enter a15 lowpower mode for Exynos3250 based on Cortex-a7
Date: Fri, 18 Apr 2014 10:15:25 +0900	[thread overview]
Message-ID: <1397783728-6193-5-git-send-email-cw00.choi@samsung.com> (raw)
In-Reply-To: <1397783728-6193-1-git-send-email-cw00.choi@samsung.com>

This patch decide proper lowpower mode of either a15 or a9 according to own ID
from Main ID register.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Marc Zynigier <marc.zyngier@arm.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 arch/arm/mach-exynos/hotplug.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index 5eead53..acf3119 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -135,16 +135,21 @@ void __ref exynos_cpu_die(unsigned int cpu)
 	int primary_part = 0;
 
 	/*
-	 * we're ready for shutdown now, so do it.
-	 * Exynos4 is A9 based while Exynos5 is A15; check the CPU part
-	 * number by reading the Main ID register and then perform the
-	 * appropriate sequence for entering low power.
+	 * Prepare the CPU for shutting down. The required sequence of
+	 * operations depends on core type. CPUID part number can be used to
+	 * determine the right way.
 	 */
-	asm("mrc p15, 0, %0, c0, c0, 0" : "=r"(primary_part) : : "cc");
-	if ((primary_part & 0xfff0) == 0xc0f0)
+	primary_part = read_cpuid_part_number();
+
+	switch (primary_part) {
+	case ARM_CPU_PART_CORTEX_A7:
+	case ARM_CPU_PART_CORTEX_A15:
 		cpu_enter_lowpower_a15();
-	else
+		break;
+	default:
 		cpu_enter_lowpower_a9();
+		break;
+	}
 
 	platform_do_lowpower(cpu, &spurious);
 
-- 
1.8.0

  parent reply	other threads:[~2014-04-18  1:16 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-18  1:15 [PATCHv3 0/7] Support new Exynos3250 SoC based on Cortex-A7 dual core Chanwoo Choi
2014-04-18  1:15 ` Chanwoo Choi
2014-04-18  1:15 ` Chanwoo Choi
2014-04-18  1:15 ` [PATCHv3 1/7] ARM: EXYNOS: Add Exynos3250 SoC ID Chanwoo Choi
2014-04-18  1:15   ` Chanwoo Choi
2014-04-18  1:15 ` [PATCHv3 2/7] ARM: EXYNOS: Support secondary CPU boot of Exynos4212 Chanwoo Choi
2014-04-18  1:15   ` Chanwoo Choi
2014-04-18  1:15 ` [PATCHv3 3/7] ARM: EXYNOS: Support secondary CPU boot of Exynos3250 Chanwoo Choi
2014-04-18  1:15   ` Chanwoo Choi
2014-04-18  1:15 ` Chanwoo Choi [this message]
2014-04-18  1:15   ` [PATCHv3 4/7] ARM: EXYNOS: Enter a15 lowpower mode for Exynos3250 based on Cortex-a7 Chanwoo Choi
2014-04-18  1:15 ` [PATCHv3 5/7] clk: samsung: exynos3250: Add clocks using common clock framework Chanwoo Choi
2014-04-18  1:15   ` Chanwoo Choi
2014-04-18  1:15 ` [PATCHv3 6/7] dt-bindings: add documentation for Exynos3250 clock controller Chanwoo Choi
2014-04-18  1:15   ` Chanwoo Choi
2014-04-18  1:15   ` Chanwoo Choi
2014-04-18  1:15 ` [PATCHv3 7/7] ARM: dts: Add device tree sources for Exynos3250 Chanwoo Choi
2014-04-18  1:15   ` Chanwoo Choi
2014-04-18  1:15   ` Chanwoo Choi
2014-04-21  1:10 ` [PATCHv3 0/7] Support new Exynos3250 SoC based on Cortex-A7 dual core Chanwoo Choi
2014-04-21  1:10   ` Chanwoo Choi

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