linux-kernel - [PATCH v11 6/7] ARM: tegra: set CPU reset handler using firmware

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Date:	Sun, 24 Nov 2013 15:30:51 +0900
From:	Alexandre Courbot <acourbot@...dia.com>
To:	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>
Cc:	Tomasz Figa <t.figa@...sung.com>, Olof Johansson <olof@...om.net>,
	Dave Martin <Dave.Martin@....com>,
	Kevin Hilman <khilman@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	gnurou@...il.com, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH v11 6/7] ARM: tegra: set CPU reset handler using firmware

Use a firmware operation to set the CPU reset handler and only resort to
doing it ourselves if there is none defined.

This supports the booting of secondary CPUs on devices using a TrustZone
secure monitor.

Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
Reviewed-by: Tomasz Figa <t.figa@...sung.com>
Reviewed-by: Stephen Warren <swarren@...dia.com>
---
 arch/arm/mach-tegra/reset.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-tegra/reset.c b/arch/arm/mach-tegra/reset.c
index 17c4b6d..146fe8e 100644
--- a/arch/arm/mach-tegra/reset.c
+++ b/arch/arm/mach-tegra/reset.c
@@ -21,6 +21,7 @@
 
 #include <asm/cacheflush.h>
 #include <asm/hardware/cache-l2x0.h>
+#include <asm/firmware.h>
 
 #include "iomap.h"
 #include "irammap.h"
@@ -65,6 +66,7 @@ static void __init tegra_cpu_reset_handler_enable(void)
 	void __iomem *iram_base = IO_ADDRESS(TEGRA_IRAM_RESET_BASE);
 	const u32 reset_address = TEGRA_IRAM_RESET_BASE +
 						tegra_cpu_reset_handler_offset;
+	int err;
 
 	BUG_ON(is_enabled);
 	BUG_ON(tegra_cpu_reset_handler_size > TEGRA_IRAM_RESET_HANDLER_SIZE);
@@ -72,9 +74,18 @@ static void __init tegra_cpu_reset_handler_enable(void)
 	memcpy(iram_base, (void *)__tegra_cpu_reset_handler_start,
 			tegra_cpu_reset_handler_size);
 
-	tegra_cpu_reset_handler_set(reset_address);
-
-	is_enabled = true;
+	err = call_firmware_op(set_cpu_boot_addr, 0, reset_address);
+	switch (err) {
+	case -ENOSYS:
+		tegra_cpu_reset_handler_set(reset_address);
+		/* pass-through */
+	case 0:
+		is_enabled = true;
+		break;
+	default:
+		pr_crit("Cannot set CPU reset handler: %d\n", err);
+		BUG();
+	}
 }
 
 void __init tegra_cpu_reset_handler_init(void)
-- 
1.8.4.2

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