linux-kernel - [PATCH v2 7/7] ARM: EXYNOS: cpuidle: add secure firmware support to AFTR mode code

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Date:	Mon, 02 Jun 2014 14:35:43 +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 7/7] ARM: EXYNOS: cpuidle: add secure firmware support to
 AFTR mode code

* Use do_idle firmware method instead of cpu_do_idle() on boards with
  secure firmware enabled.

* Use sysram_ns_base_addr + 0x24 address for exynos_boot_vector_addr()
  and sysram_ns_base_addr + 0x20 one for exynos_boot_vector_flag() on
  boards with secure firmware enabled.

This patch fixes hang on an attempt to enter AFTR mode for TRATS2
board (which uses EXYNOS4412 SoC with secure firmware enabled).

This patch shouldn't cause any functionality changes on boards that
don't use secure firmware.

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 arch/arm/mach-exynos/pm.c        | 8 ++++++--
 drivers/cpuidle/cpuidle-exynos.c | 7 ++++++-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
index 0fb9a5a..62a0a5e 100644
--- a/arch/arm/mach-exynos/pm.c
+++ b/arch/arm/mach-exynos/pm.c
@@ -169,7 +169,9 @@ int exynos_cluster_power_state(int cluster)
 
 static inline void __iomem *exynos_boot_vector_addr(void)
 {
-	if (samsung_rev() == EXYNOS4210_REV_1_1)
+	if (firmware_run())
+		return sysram_ns_base_addr + 0x24;
+	else if (samsung_rev() == EXYNOS4210_REV_1_1)
 		return S5P_INFORM7;
 	else if (samsung_rev() == EXYNOS4210_REV_1_0)
 		return sysram_base_addr + 0x24;
@@ -178,7 +180,9 @@ static inline void __iomem *exynos_boot_vector_addr(void)
 
 static inline void __iomem *exynos_boot_vector_flag(void)
 {
-	if (samsung_rev() == EXYNOS4210_REV_1_1)
+	if (firmware_run())
+		return sysram_ns_base_addr + 0x20;
+	else if (samsung_rev() == EXYNOS4210_REV_1_1)
 		return S5P_INFORM6;
 	else if (samsung_rev() == EXYNOS4210_REV_1_0)
 		return sysram_base_addr + 0x20;
diff --git a/drivers/cpuidle/cpuidle-exynos.c b/drivers/cpuidle/cpuidle-exynos.c
index 7c01512..f90a4a0 100644
--- a/drivers/cpuidle/cpuidle-exynos.c
+++ b/drivers/cpuidle/cpuidle-exynos.c
@@ -17,13 +17,18 @@
 #include <asm/proc-fns.h>
 #include <asm/suspend.h>
 #include <asm/cpuidle.h>
+#include <asm/firmware.h>
 
 static void (*exynos_enter_aftr)(void);
 
 static int idle_finisher(unsigned long flags)
 {
 	exynos_enter_aftr();
-	cpu_do_idle();
+	if (firmware_run())
+		/* no need to check the return value on EXYNOS SoCs */
+		call_firmware_op(do_idle, FW_DO_IDLE_AFTR);
+	else
+		cpu_do_idle();
 
 	return 1;
 }
-- 
1.8.2.3

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