linux-kernel - [PATCHv4 3/7] ARM: EXYNOS: Support secondary CPU boot of Exynos3250

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Date:	Fri, 25 Apr 2014 10:16:08 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	kgene.kim@...sung.com, t.figa@...sung.com
Cc:	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	ben-linux@...ff.org, arnd@...db.de, olof@...om.net,
	marc.zyngier@....com, thomas.abraham@...aro.org,
	kyungmin.park@...sung.com, cw00.choi@...sung.com,
	inki.dae@...sung.com, sw0312.kim@...sung.com,
	hyunhee.kim@...sung.com, yj44.cho@...sung.com,
	chanho61.park@...sung.com, sajjan.linux@...il.com,
	tushar.behera@...aro.org, sachin.kamat@...aro.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: [PATCHv4 3/7] ARM: EXYNOS: Support secondary CPU boot of Exynos3250

This patch fix the offset of CPU boot address and don't need to send smc call
of SMC_CMD_CPU1BOOT command for secondary CPU boot because Exynos3250 removes
WFE in secure mode.

Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 arch/arm/mach-exynos/firmware.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
index aa01c42..386d01d 100644
--- a/arch/arm/mach-exynos/firmware.c
+++ b/arch/arm/mach-exynos/firmware.c
@@ -31,11 +31,17 @@ static int exynos_do_idle(void)
 static int exynos_cpu_boot(int cpu)
 {
 	/*
+	 * Exynos3250 doesn't need to send smc command for secondary CPU boot
+	 * because Exynos3250 removes WFE in secure mode.
+	 */
+	if (soc_is_exynos3250())
+		return 0;
+	/*
 	 * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
 	 * But, Exynos4212 has only one secondary CPU so second parameter
 	 * isn't used for informing secure firmware about CPU id.
 	 */
-	if (soc_is_exynos4212())
+	else if (soc_is_exynos4212())
 		cpu = 0;
 
 	exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
@@ -46,7 +52,7 @@ static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
 {
 	void __iomem *boot_reg = S5P_VA_SYSRAM_NS + 0x1c;
 
-	if (!soc_is_exynos4212())
+	if (!soc_is_exynos4212() && !soc_is_exynos3250())
 		boot_reg += 4*cpu;
 
 	__raw_writel(boot_addr, boot_reg);
-- 
1.8.0

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