[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 <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

include/asm-ppc/hw_irq.h

···
-/*
- * Copyright (C) 1999 Cort Dougan <[e-mail]>
- */
-#ifdef __KERNEL__
-#ifndef _PPC_HW_IRQ_H
-#define _PPC_HW_IRQ_H
-
-#include <asm/ptrace.h>
-#include <asm/reg.h>
-#include <asm/irq.h>
-
-extern void timer_interrupt(struct pt_regs *);
-
-#define irqs_disabled()	((mfmsr() & MSR_EE) == 0)
-
-static inline void local_irq_disable(void)
-{
-	unsigned long msr;
-	msr = mfmsr();
-	mtmsr(msr & ~MSR_EE);
-	__asm__ __volatile__("": : :"memory");
-}
-
-static inline void local_irq_enable(void)
-{
-	unsigned long msr;
-	__asm__ __volatile__("": : :"memory");
-	msr = mfmsr();
-	mtmsr(msr | MSR_EE);
-}
-
-static inline void local_irq_save_ptr(unsigned long *flags)
-{
-	unsigned long msr;
-	msr = mfmsr();
-	*flags = msr;
-	mtmsr(msr & ~MSR_EE);
-	__asm__ __volatile__("": : :"memory");
-}
-
-#define local_save_flags(flags)		((flags) = mfmsr())
-#define local_irq_save(flags)		local_irq_save_ptr(&flags)
-#define local_irq_restore(flags)	mtmsr(flags)
-
-extern void do_lost_interrupts(unsigned long);
-
-#define mask_irq(irq) ({if (irq_desc[irq].handler && irq_desc[irq].handler->disable) irq_desc[irq].handler->disable(irq);})
-#define unmask_irq(irq) ({if (irq_desc[irq].handler && irq_desc[irq].handler->enable) irq_desc[irq].handler->enable(irq);})
-#define ack_irq(irq) ({if (irq_desc[irq].handler && irq_desc[irq].handler->ack) irq_desc[irq].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 /* _PPC_HW_IRQ_H */
-#endif /* __KERNEL__ */

include/asm-ppc/irq.h

···
  */
 #define ARCH_HAS_IRQ_PER_CPU
 
+#define get_irq_desc(irq) (&irq_desc[(irq)])
+
+/* Define a way to iterate across irqs. */
+#define for_each_irq(i) \
+	for ((i) = 0; (i) < NR_IRQS; ++(i))
+
 #if defined(CONFIG_40x)
 #include <asm/ibm4xx.h>
 

include/asm-ppc64/hw_irq.h include/asm-powerpc/hw_irq.h

···
 /*
  * Copyright (C) 1999 Cort Dougan <[e-mail]>
- *
- * Use inline IRQs where possible - Anton Blanchard <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
  */
+#ifndef _ASM_POWERPC_HW_IRQ_H
+#define _ASM_POWERPC_HW_IRQ_H
+
 #ifdef __KERNEL__
-#ifndef _PPC64_HW_IRQ_H
-#define _PPC64_HW_IRQ_H
 
 #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 *);
···
 
 #else
 
-#define local_save_flags(flags)	((flags) = mfmsr())
+#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;
-	msr = mfmsr();
-	__mtmsrd(msr & ~MSR_EE, 1);
 	__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();
-	__mtmsrd(msr | MSR_EE, 1);
+	SET_MSR_EE(msr | MSR_EE);
+#endif
 }
 
-static inline void __do_save_and_cli(unsigned long *flags)
+static inline void local_irq_save_ptr(unsigned long *flags)
 {
 	unsigned long msr;
 	msr = mfmsr();
 	*flags = msr;
-	__mtmsrd(msr & ~MSR_EE, 1);
+#ifdef CONFIG_BOOKE
+	__asm__ __volatile__("wrteei 0": : :"memory");
+#else
+	SET_MSR_EE(msr & ~MSR_EE);
+#endif
 	__asm__ __volatile__("": : :"memory");
 }
 
-#define local_irq_save(flags)          __do_save_and_cli(&flags)
-
-#define irqs_disabled()				\
-({						\
-	unsigned long flags;			\
-	local_save_flags(flags);		\
-	!(flags & MSR_EE);			\
-})
+#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 */
 
···
  */
 struct hw_interrupt_type;
 static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
- 
-#endif /* _PPC64_HW_IRQ_H */
-#endif /* __KERNEL__ */
+
+#endif	/* __KERNEL__ */
+#endif	/* _ASM_POWERPC_HW_IRQ_H */