[U-Boot] [PATCH 13/15] ARM: PSCI: Add helper functions to access per-CPU target PC storage

[Chen-Yu Tsai]

Now that we have a data section, add helper functions to save and fetch
per-CPU target PC.

Signed-off-by: Chen-Yu Tsai <wens at csie.org>
---
 arch/arm/cpu/armv7/Makefile      |  1 +
 arch/arm/cpu/armv7/psci-common.c | 39 +++++++++++++++++++++++++++++++++++++++
 arch/arm/include/asm/psci.h      |  4 ++++
 3 files changed, 44 insertions(+)
 create mode 100644 arch/arm/cpu/armv7/psci-common.c

diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index 328c4b10e976..730b59986a01 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -26,6 +26,7 @@ endif
 
 ifneq ($(CONFIG_ARMV7_PSCI),)
 obj-y	+= psci.o
+obj-y	+= psci-common.o
 endif
 
 obj-$(CONFIG_IPROC) += iproc-common/
diff --git a/arch/arm/cpu/armv7/psci-common.c b/arch/arm/cpu/armv7/psci-common.c
new file mode 100644
index 000000000000..d14b6937473f
--- /dev/null
+++ b/arch/arm/cpu/armv7/psci-common.c
@@ -0,0 +1,39 @@
+/*
+ * Common PSCI functions
+ *
+ * Copyright (C) 2016 Chen-Yu Tsai
+ * Author: Chen-Yu Tsai <wens at csie.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <asm/armv7.h>
+#include <asm/macro.h>
+#include <asm/psci.h>
+#include <asm/secure.h>
+#include <linux/linkage.h>
+
+static u32 psci_target_pc[CONFIG_ARMV7_PSCI_NR_CPUS] __secure_data = { 0 };
+
+void __secure psci_save_target_pc(int cpu, u32 pc)
+{
+	psci_target_pc[cpu] = pc;
+	DSB;
+}
+
+u32 __secure psci_get_target_pc(int cpu)
+{
+	return psci_target_pc[cpu];
+}
+
diff --git a/arch/arm/include/asm/psci.h b/arch/arm/include/asm/psci.h
index dab576997654..a0da02300700 100644
--- a/arch/arm/include/asm/psci.h
+++ b/arch/arm/include/asm/psci.h
@@ -54,6 +54,10 @@
 #ifndef __ASSEMBLY__
 #include <asm/types.h>
 
+/* These 2 helper functions assume cpu < CONFIG_ARMV7_PSCI_NR_CPUS */
+u32 psci_get_target_pc(int cpu);
+void psci_save_target_pc(int cpu, u32 pc);
+
 void psci_cpu_entry(void);
 u32 psci_get_cpu_id(void);
 u32 psci_get_cpu_stack_top(int cpu);
-- 
2.8.1