linux-kernel - [PATCH 4/5] ARM: trusted_foundations: implement do

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Date:	Tue, 21 Jan 2014 19:10:15 +0900
From:	Alexandre Courbot <acourbot@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Russell King <linux@....linux.org.uk>
CC:	Olof Johansson <olof@...om.net>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<gnurou@...il.com>, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH 4/5] ARM: trusted_foundations: implement do_idle()

Support the do_idle() firmware call, which is necessary to properly
support cpuidle.

Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 arch/arm/firmware/trusted_foundations.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/arm/firmware/trusted_foundations.c b/arch/arm/firmware/trusted_foundations.c
index ef1e3d8f4af0..7c14af809995 100644
--- a/arch/arm/firmware/trusted_foundations.c
+++ b/arch/arm/firmware/trusted_foundations.c
@@ -22,6 +22,15 @@
 
 #define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
 
+#define TF_CPU_PM		 0xfffffffc
+#define TF_CPU_PM_LP0		 0xffffffe3
+#define TF_CPU_PM_LP1		 0xffffffe6
+#define TF_CPU_PM_LP1_NO_MC_CLK	 0xffffffe5
+#define TF_CPU_PM_LP2		 0xffffffe4
+#define TF_CPU_PM_LP2_NOFLUSH_L2 0xffffffe7
+
+static unsigned long cpu_boot_addr;
+
 static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2)
 {
 	asm volatile(
@@ -41,13 +50,22 @@ static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2)
 
 static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
 {
-	tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, boot_addr, 0);
+	cpu_boot_addr = boot_addr;
+	tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, cpu_boot_addr, 0);
+
+	return 0;
+}
+
+static int tf_do_idle(void)
+{
+	tf_generic_smc(TF_CPU_PM, TF_CPU_PM_LP2_NOFLUSH_L2, cpu_boot_addr);
 
 	return 0;
 }
 
 static const struct firmware_ops trusted_foundations_ops = {
 	.set_cpu_boot_addr = tf_set_cpu_boot_addr,
+	.do_idle = tf_do_idle,
 };
 
 void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
-- 
1.8.5.3

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