From b671ad2befe37131af380183760862d5cbad858d Mon Sep 17 00:00:00 2001
From: Kumar Gala <galak@freescale.com>
Date: Wed, 21 Sep 2005 16:52:55 -0500
Subject: [PATCH] powerpc: merged hw_irq.h

Merged hw_irq.h between ppc32 & ppc64.  Added support to use the Book-E
wrtee[i] instructions that allow modifying MSR[EE] atomically.
Additionally, added get_irq_desc() macros to ppc32 to allow mask_irq(),
unmask_irq(), and ack_irq() to be common between ppc32 & ppc64.

Note: because 64-bit Book-E implementations only have a 32-bit MSR the
macro's for Book-E need to come before the PPC64 macro's to ensure the
right thing happends for 64-bit Book-E processors.

Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---
 include/asm-powerpc/hw_irq.h | 115 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 include/asm-powerpc/hw_irq.h

(limited to 'include/asm-powerpc/hw_irq.h')

diff --git a/include/asm-powerpc/hw_irq.h b/include/asm-powerpc/hw_irq.h
new file mode 100644
index 00000000000..605a65e4206
--- /dev/null
+++ b/include/asm-powerpc/hw_irq.h
@@ -0,0 +1,115 @@
+/*
+ * 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/config.h>
+#include <linux/errno.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+#include <asm/irq.h>
+
+extern void timer_interrupt(struct pt_regs *);
+extern void ppc_irq_dispatch_handler(struct pt_regs *regs, int irq);
+
+#ifdef CONFIG_PPC_ISERIES
+
+extern unsigned long local_get_flags(void);
+extern unsigned long local_irq_disable(void);
+extern void local_irq_restore(unsigned long);
+
+#define local_irq_enable()	local_irq_restore(1)
+#define local_save_flags(flags)	((flags) = local_get_flags())
+#define local_irq_save(flags)	((flags) = local_irq_disable())
+
+#define irqs_disabled()		(local_get_flags() == 0)
+
+#else
+
+#if defined(CONFIG_BOOKE)
+#define SET_MSR_EE(x)	mtmsr(x)
+#define local_irq_restore(flags)	__asm__ __volatile__("wrtee %0" : : "r" (flags) : "memory")
+#elif defined(__powerpc64__)
+#define SET_MSR_EE(x)	__mtmsrd(x, 1)
+#define local_irq_restore(flags) do { \
+	__asm__ __volatile__("": : :"memory"); \
+	__mtmsrd((flags), 1); \
+} while(0)
+#else
+#define SET_MSR_EE(x)	mtmsr(x)
+#define local_irq_restore(flags)	mtmsr(flags)
+#endif
+
+static inline void local_irq_disable(void)
+{
+#ifdef CONFIG_BOOKE
+	__asm__ __volatile__("wrteei 0": : :"memory");
+#else
+	unsigned long msr;
+	__asm__ __volatile__("": : :"memory");
+	msr = mfmsr();
+	SET_MSR_EE(msr & ~MSR_EE);
+#endif
+}
+
+static inline void local_irq_enable(void)
+{
+#ifdef CONFIG_BOOKE
+	__asm__ __volatile__("wrteei 1": : :"memory");
+#else
+	unsigned long msr;
+	__asm__ __volatile__("": : :"memory");
+	msr = mfmsr();
+	SET_MSR_EE(msr | MSR_EE);
+#endif
+}
+
+static inline void local_irq_save_ptr(unsigned long *flags)
+{
+	unsigned long msr;
+	msr = mfmsr();
+	*flags = msr;
+#ifdef CONFIG_BOOKE
+	__asm__ __volatile__("wrteei 0": : :"memory");
+#else
+	SET_MSR_EE(msr & ~MSR_EE);
+#endif
+	__asm__ __volatile__("": : :"memory");
+}
+
+#define local_save_flags(flags)	((flags) = mfmsr())
+#define local_irq_save(flags)	local_irq_save_ptr(&flags)
+#define irqs_disabled()		((mfmsr() & MSR_EE) == 0)
+
+#endif /* CONFIG_PPC_ISERIES */
+
+#define mask_irq(irq)						\
+	({							\
+	 	irq_desc_t *desc = get_irq_desc(irq);		\
+		if (desc->handler && desc->handler->disable)	\
+			desc->handler->disable(irq);		\
+	})
+#define unmask_irq(irq)						\
+	({							\
+	 	irq_desc_t *desc = get_irq_desc(irq);		\
+		if (desc->handler && desc->handler->enable)	\
+			desc->handler->enable(irq);		\
+	})
+#define ack_irq(irq)						\
+	({							\
+	 	irq_desc_t *desc = get_irq_desc(irq);		\
+		if (desc->handler && desc->handler->ack)	\
+			desc->handler->ack(irq);		\
+	})
+
+/* Should we handle this via lost interrupts and IPIs or should we don't care like
+ * we do now ? --BenH.
+ */
+struct hw_interrupt_type;
+static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
+
+#endif	/* __KERNEL__ */
+#endif	/* _ASM_POWERPC_HW_IRQ_H */
-- 
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