linux-kernel - [PATCH v2 2/7] ARM: EXYNOS: add support for firmware-assisted c15resume

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Date:	Mon, 02 Jun 2014 14:35:38 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Kukjin Kim <kgene.kim@...sung.com>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	b.zolnierkie@...sung.com
Subject: [PATCH v2 2/7] ARM: EXYNOS: add support for firmware-assisted c15resume

From: Tomasz Figa <t.figa@...sung.com>

This change is a preparation for adding secure firmware support to
EXYNOS cpuidle driver.

This patch shouldn't cause any functionality changes.

Signed-off-by: Tomasz Figa <t.figa@...sung.com>
[bzolnier: splitted out from bigger patch]
Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
---
 arch/arm/include/asm/firmware.h | 4 ++++
 arch/arm/mach-exynos/firmware.c | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/arm/include/asm/firmware.h b/arch/arm/include/asm/firmware.h
index c72ec47..70883c7 100644
--- a/arch/arm/include/asm/firmware.h
+++ b/arch/arm/include/asm/firmware.h
@@ -41,6 +41,10 @@ struct firmware_ops {
 	 * Initializes L2 cache
 	 */
 	int (*l2x0_init)(void);
+	/*
+	 * Restores coprocessor 15 registers
+	 */
+	int (*c15resume)(u32 *regs);
 };
 
 /* Global pointer for current firmware_ops structure, can't be NULL. */
diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
index eb91d23..195b65c 100644
--- a/arch/arm/mach-exynos/firmware.c
+++ b/arch/arm/mach-exynos/firmware.c
@@ -64,10 +64,18 @@ static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
 	return 0;
 }
 
+static int exynos_c15resume(u32 *regs)
+{
+	exynos_smc(SMC_CMD_C15RESUME, regs[0], regs[1], 0);
+
+	return 0;
+}
+
 static const struct firmware_ops exynos_firmware_ops = {
 	.do_idle		= exynos_do_idle,
 	.set_cpu_boot_addr	= exynos_set_cpu_boot_addr,
 	.cpu_boot		= exynos_cpu_boot,
+	.c15resume	= exynos_c15resume,
 };
 
 void __init exynos_firmware_init(void)
-- 
1.8.2.3

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