summaryrefslogtreecommitdiff
path: root/arch/mn10300/include/asm/irqflags.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mn10300/include/asm/irqflags.h')
-rw-r--r--arch/mn10300/include/asm/irqflags.h123
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 00000000000..5e529a117cb
--- /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 */