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/* 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");
}
static inline void arch_local_cli(void)
{
asm volatile(
" and %0,epsw \n"
" nop \n"
" nop \n"
" nop \n"
:
: "i"(~EPSW_IE)
: "memory"
);
}
static inline unsigned long arch_local_cli_save(void)
{
unsigned long flags = arch_local_save_flags();
arch_local_cli();
return flags;
}
static inline void arch_local_sti(void)
{
asm volatile(
" or %0,epsw \n"
:
: "i"(EPSW_IE)
: "memory");
}
static inline void arch_local_change_intr_mask_level(unsigned long level)
{
asm volatile(
" and %0,epsw \n"
" or %1,epsw \n"
:
: "i"(~EPSW_IM), "i"(EPSW_IE | level)
: "cc", "memory");
}
#else /* !__ASSEMBLY__ */
#define LOCAL_SAVE_FLAGS(reg) \
mov epsw,reg
#define LOCAL_IRQ_DISABLE \
and ~EPSW_IM,epsw; \
or EPSW_IE|MN10300_CLI_LEVEL,epsw; \
nop; \
nop; \
nop
#define LOCAL_IRQ_ENABLE \
or EPSW_IE|EPSW_IM_7,epsw
#define LOCAL_IRQ_RESTORE(reg) \
mov reg,epsw
#define LOCAL_CLI_SAVE(reg) \
mov epsw,reg; \
and ~EPSW_IE,epsw; \
nop; \
nop; \
nop
#define LOCAL_CLI \
and ~EPSW_IE,epsw; \
nop; \
nop; \
nop
#define LOCAL_STI \
or EPSW_IE,epsw
#define LOCAL_CHANGE_INTR_MASK_LEVEL(level) \
and ~EPSW_IM,epsw; \
or EPSW_IE|(level),epsw
#endif /* __ASSEMBLY__ */
#endif /* _ASM_IRQFLAGS_H */
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