linux-kernel - [PATCHv2 6/8] ARM: EXYNOS: Enter a15 lowpower mode for Exynos3250 based on Cortex-a7

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-id: <1397527192-21988-7-git-send-email-cw00.choi@samsung.com>
Date:	Tue, 15 Apr 2014 10:59:50 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux@....linux.org.uk, ben-linux@...ff.org, kgene.kim@...sung.com,
	t.figa@...sung.com, thomas.abraham@...aro.org,
	kyungmin.park@...sung.com, cw00.choi@...sung.com,
	sw0312.kim@...sung.com, hyunhee.kim@...sung.com,
	yj44.cho@...sung.com, chanho61.park@...sung.com, arnd@...db.de,
	olof@...om.net, marc.zyngier@....com,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: [PATCHv2 6/8] ARM: EXYNOS: Enter a15 lowpower mode for Exynos3250
 based on Cortex-a7

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

Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 arch/arm/mach-exynos/hotplug.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index 5eead53..99e54e0 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -135,16 +135,22 @@ 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
+	 * we're ready for shutdown now, so do it. Exynos4 is A9 based
+	 * while Exynos5 is A15/Exynos3 is A7; check the CPU part
 	 * number by reading the Main ID register and then perform the
 	 * appropriate sequence for entering low power.
 	 */
-	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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/