1 files changed, 123 insertions, 0 deletions
diff --git a/arch/mn10300/include/asm/irqflags.h b/arch/mn10300/include/asm/irqflags.h
new file mode 100644
index 000000000000..5e529a117cb2
--- /dev/null
+++ b/arch/mn10300/include/asm/irqflags.h
@@ -0,0 +1,123 @@
+/* MN10300 IRQ flag handling
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _ASM_IRQFLAGS_H
+#define _ASM_IRQFLAGS_H
+
+#include <asm/cpu-regs.h>
+
+/*
+ * interrupt control
+ * - "disabled": run in IM1/2
+ *   - level 0 - GDB stub
+ *   - level 1 - virtual serial DMA (if present)
+ *   - level 5 - normal interrupt priority
+ *   - level 6 - timer interrupt
+ * - "enabled":  run in IM7
+ */
+#ifdef CONFIG_MN10300_TTYSM
+#define MN10300_CLI_LEVEL	EPSW_IM_2
+#else
+#define MN10300_CLI_LEVEL	EPSW_IM_1
+#endif
+
+#ifndef __ASSEMBLY__
+
+static inline unsigned long arch_local_save_flags(void)
+{
+	unsigned long flags;
+
+	asm volatile("mov epsw,%0" : "=d"(flags));
+	return flags;
+}
+
+static inline void arch_local_irq_disable(void)
+{
+	asm volatile(
+		"	and %0,epsw	\n"
+		"	or %1,epsw	\n"
+		"	nop		\n"
+		"	nop		\n"
+		"	nop		\n"
+		:
+		: "i"(~EPSW_IM), "i"(EPSW_IE | MN10300_CLI_LEVEL)
+		: "memory");
+}
+
+static inline unsigned long arch_local_irq_save(void)
+{
+	unsigned long flags;
+
+	flags = arch_local_save_flags();
+	arch_local_irq_disable();
+	return flags;
+}
+
+/*
+ * we make sure arch_irq_enable() doesn't cause priority inversion
+ */
+extern unsigned long __mn10300_irq_enabled_epsw;
+
+static inline void arch_local_irq_enable(void)
+{
+	unsigned long tmp;
+
+	asm volatile(
+		"	mov	epsw,%0		\n"
+		"	and	%1,%0		\n"
+		"	or	%2,%0		\n"
+		"	mov	%0,epsw		\n"
+		: "=&d"(tmp)
+		: "i"(~EPSW_IM), "r"(__mn10300_irq_enabled_epsw)
+		: "memory");
+}
+
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+	asm volatile(
+		"	mov %0,epsw	\n"
+		"	nop		\n"
+		"	nop		\n"
+		"	nop		\n"
+		:
+		: "d"(flags)
+		: "memory", "cc");
+}
+
+static inline bool arch_irqs_disabled_flags(unsigned long flags)
+{
+	return (flags & EPSW_IM) <= MN10300_CLI_LEVEL;
+}
+
+static inline bool arch_irqs_disabled(void)
+{
+	return arch_irqs_disabled_flags(arch_local_save_flags());
+}
+
+/*
+ * Hook to save power by halting the CPU
+ * - called from the idle loop
+ * - must reenable interrupts (which takes three instruction cycles to complete)
+ */
+static inline void arch_safe_halt(void)
+{
+	asm volatile(
+		"	or	%0,epsw	\n"
+		"	nop		\n"
+		"	nop		\n"
+		"	bset	%2,(%1)	\n"
+		:
+		: "i"(EPSW_IE|EPSW_IM), "n"(&CPUM), "i"(CPUM_SLEEP)
+		: "cc");
+}
+
+#endif /* __ASSEMBLY__ */
+#endif /* _ASM_IRQFLAGS_H */