Initial import

1 files changed, 212 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
new file mode 100644
index 000000000..b59ac27a6
--- /dev/null
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
+ */
+#ifndef _ASM_POWERPC_HW_IRQ_H
+#define _ASM_POWERPC_HW_IRQ_H
+
+#ifdef __KERNEL__
+
+#include <linux/errno.h>
+#include <linux/compiler.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+
+#ifdef CONFIG_PPC64
+
+/*
+ * PACA flags in paca->irq_happened.
+ *
+ * This bits are set when interrupts occur while soft-disabled
+ * and allow a proper replay. Additionally, PACA_IRQ_HARD_DIS
+ * is set whenever we manually hard disable.
+ */
+#define PACA_IRQ_HARD_DIS	0x01
+#define PACA_IRQ_DBELL		0x02
+#define PACA_IRQ_EE		0x04
+#define PACA_IRQ_DEC		0x08 /* Or FIT */
+#define PACA_IRQ_EE_EDGE	0x10 /* BookE only */
+#define PACA_IRQ_HMI		0x20
+
+#endif /* CONFIG_PPC64 */
+
+#ifndef __ASSEMBLY__
+
+extern void __replay_interrupt(unsigned int vector);
+
+extern void timer_interrupt(struct pt_regs *);
+extern void performance_monitor_exception(struct pt_regs *regs);
+extern void WatchdogException(struct pt_regs *regs);
+extern void unknown_exception(struct pt_regs *regs);
+
+#ifdef CONFIG_PPC64
+#include <asm/paca.h>
+
+static inline unsigned long arch_local_save_flags(void)
+{
+	unsigned long flags;
+
+	asm volatile(
+		"lbz %0,%1(13)"
+		: "=r" (flags)
+		: "i" (offsetof(struct paca_struct, soft_enabled)));
+
+	return flags;
+}
+
+static inline unsigned long arch_local_irq_disable(void)
+{
+	unsigned long flags, zero;
+
+	asm volatile(
+		"li %1,0; lbz %0,%2(13); stb %1,%2(13)"
+		: "=r" (flags), "=&r" (zero)
+		: "i" (offsetof(struct paca_struct, soft_enabled))
+		: "memory");
+
+	return flags;
+}
+
+extern void arch_local_irq_restore(unsigned long);
+
+static inline void arch_local_irq_enable(void)
+{
+	arch_local_irq_restore(1);
+}
+
+static inline unsigned long arch_local_irq_save(void)
+{
+	return arch_local_irq_disable();
+}
+
+static inline bool arch_irqs_disabled_flags(unsigned long flags)
+{
+	return flags == 0;
+}
+
+static inline bool arch_irqs_disabled(void)
+{
+	return arch_irqs_disabled_flags(arch_local_save_flags());
+}
+
+#ifdef CONFIG_PPC_BOOK3E
+#define __hard_irq_enable()	asm volatile("wrteei 1" : : : "memory")
+#define __hard_irq_disable()	asm volatile("wrteei 0" : : : "memory")
+#else
+#define __hard_irq_enable()	__mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
+#define __hard_irq_disable()	__mtmsrd(local_paca->kernel_msr, 1)
+#endif
+
+#define hard_irq_disable()	do {			\
+	u8 _was_enabled;				\
+	__hard_irq_disable();				\
+	_was_enabled = local_paca->soft_enabled;	\
+	local_paca->soft_enabled = 0;			\
+	local_paca->irq_happened |= PACA_IRQ_HARD_DIS;	\
+	if (_was_enabled)				\
+		trace_hardirqs_off();			\
+} while(0)
+
+static inline bool lazy_irq_pending(void)
+{
+	return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
+}
+
+/*
+ * This is called by asynchronous interrupts to conditionally
+ * re-enable hard interrupts when soft-disabled after having
+ * cleared the source of the interrupt
+ */
+static inline void may_hard_irq_enable(void)
+{
+	get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
+	if (!(get_paca()->irq_happened & PACA_IRQ_EE))
+		__hard_irq_enable();
+}
+
+static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
+{
+	return !regs->softe;
+}
+
+extern bool prep_irq_for_idle(void);
+
+#else /* CONFIG_PPC64 */
+
+#define SET_MSR_EE(x)	mtmsr(x)
+
+static inline unsigned long arch_local_save_flags(void)
+{
+	return mfmsr();
+}
+
+static inline void arch_local_irq_restore(unsigned long flags)
+{
+#if defined(CONFIG_BOOKE)
+	asm volatile("wrtee %0" : : "r" (flags) : "memory");
+#else
+	mtmsr(flags);
+#endif
+}
+
+static inline unsigned long arch_local_irq_save(void)
+{
+	unsigned long flags = arch_local_save_flags();
+#ifdef CONFIG_BOOKE
+	asm volatile("wrteei 0" : : : "memory");
+#else
+	SET_MSR_EE(flags & ~MSR_EE);
+#endif
+	return flags;
+}
+
+static inline void arch_local_irq_disable(void)
+{
+#ifdef CONFIG_BOOKE
+	asm volatile("wrteei 0" : : : "memory");
+#else
+	arch_local_irq_save();
+#endif
+}
+
+static inline void arch_local_irq_enable(void)
+{
+#ifdef CONFIG_BOOKE
+	asm volatile("wrteei 1" : : : "memory");
+#else
+	unsigned long msr = mfmsr();
+	SET_MSR_EE(msr | MSR_EE);
+#endif
+}
+
+static inline bool arch_irqs_disabled_flags(unsigned long flags)
+{
+	return (flags & MSR_EE) == 0;
+}
+
+static inline bool arch_irqs_disabled(void)
+{
+	return arch_irqs_disabled_flags(arch_local_save_flags());
+}
+
+#define hard_irq_disable()		arch_local_irq_disable()
+
+static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
+{
+	return !(regs->msr & MSR_EE);
+}
+
+static inline void may_hard_irq_enable(void) { }
+
+#endif /* CONFIG_PPC64 */
+
+#define ARCH_IRQ_INIT_FLAGS	IRQ_NOREQUEST
+
+/*
+ * interrupt-retrigger: should we handle this via lost interrupts and IPIs
+ * or should we not care like we do now ? --BenH.
+ */
+struct irq_chip;
+
+#endif  /* __ASSEMBLY__ */
+#endif	/* __KERNEL__ */
+#endif	/* _ASM_POWERPC_HW_IRQ_H */