[PATCH v2] ARM: ARMv7-M: implement restart routine common to all v7-M machines
Uwe Kleine-König
u.kleine-koenig at pengutronix.de
Thu Aug 15 11:45:36 EDT 2013
The newly introduced function is to be used as .restart callback for
ARMv7-M machines. The used register is architecturally defined, so it
should work for all M-class machines.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
Changes since v1, sent with Message-Id:
1376494625-25496-1-git-send-email-u.kleine-koenig at pengutronix.de:
- add a more verbose change log
- rename arch/arm/kernel/common-v7m.c to arch/arm/kernel/v7m.c
arch/arm/include/asm/v7m.h | 12 ++++++++++++
arch/arm/kernel/Makefile | 2 +-
arch/arm/kernel/v7m.c | 19 +++++++++++++++++++
3 files changed, 32 insertions(+), 1 deletion(-)
create mode 100644 arch/arm/kernel/v7m.c
diff --git a/arch/arm/include/asm/v7m.h b/arch/arm/include/asm/v7m.h
index fa88d09..615781c 100644
--- a/arch/arm/include/asm/v7m.h
+++ b/arch/arm/include/asm/v7m.h
@@ -15,6 +15,10 @@
#define V7M_SCB_VTOR 0x08
+#define V7M_SCB_AIRCR 0x0c
+#define V7M_SCB_AIRCR_VECTKEY (0x05fa << 16)
+#define V7M_SCB_AIRCR_SYSRESETREQ (1 << 2)
+
#define V7M_SCB_SCR 0x10
#define V7M_SCB_SCR_SLEEPDEEP (1 << 2)
@@ -42,3 +46,11 @@
*/
#define EXC_RET_STACK_MASK 0x00000004
#define EXC_RET_THREADMODE_PROCESSSTACK 0xfffffffd
+
+#ifndef __ASSEMBLY__
+
+enum reboot_mode;
+
+void armv7m_restart(enum reboot_mode mode, const char *cmd);
+
+#endif /* __ASSEMBLY__ */
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 86d10dd..5140df5f 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -24,7 +24,7 @@ obj-$(CONFIG_ATAGS_PROC) += atags_proc.o
obj-$(CONFIG_DEPRECATED_PARAM_STRUCT) += atags_compat.o
ifeq ($(CONFIG_CPU_V7M),y)
-obj-y += entry-v7m.o
+obj-y += entry-v7m.o v7m.o
else
obj-y += entry-armv.o
endif
diff --git a/arch/arm/kernel/v7m.c b/arch/arm/kernel/v7m.c
new file mode 100644
index 0000000..4d2cba9
--- /dev/null
+++ b/arch/arm/kernel/v7m.c
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2013 Uwe Kleine-Koenig for Pengutronix
+ *
+ * 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.
+ */
+#include <linux/io.h>
+#include <linux/reboot.h>
+#include <asm/barrier.h>
+#include <asm/v7m.h>
+
+void armv7m_restart(enum reboot_mode mode, const char *cmd)
+{
+ dsb();
+ __raw_writel(V7M_SCB_AIRCR_VECTKEY | V7M_SCB_AIRCR_SYSRESETREQ,
+ BASEADDR_V7M_SCB + V7M_SCB_AIRCR);
+ dsb();
+}
--
1.8.4.rc0
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