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/*
* Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_IRQFLAGS_ARCV2_H
#define __ASM_IRQFLAGS_ARCV2_H
#include <asm/arcregs.h>
/* status32 Bits */
#define STATUS_AD_BIT 19 /* Disable Align chk: core supports non-aligned */
#define STATUS_IE_BIT 31
#define STATUS_AD_MASK (1<<STATUS_AD_BIT)
#define STATUS_IE_MASK (1<<STATUS_IE_BIT)
#define AUX_USER_SP 0x00D
#define AUX_IRQ_CTRL 0x00E
#define AUX_IRQ_ACT 0x043 /* Active Intr across all levels */
#define AUX_IRQ_LVL_PEND 0x200 /* Pending Intr across all levels */
#define AUX_IRQ_PRIORITY 0x206
#define ICAUSE 0x40a
#define AUX_IRQ_SELECT 0x40b
#define AUX_IRQ_ENABLE 0x40c
/* Was Intr taken in User Mode */
#define AUX_IRQ_ACT_BIT_U 31
/*
* User space should be interruptable even by lowest prio interrupt
* Safe even if actual interrupt priorities is fewer or even one
*/
#define ARCV2_IRQ_DEF_PRIO 15
/* seed value for status register */
#define ISA_INIT_STATUS_BITS (STATUS_IE_MASK | STATUS_AD_MASK | \
(ARCV2_IRQ_DEF_PRIO << 1))
/* SLEEP needs default irq priority (<=) which can interrupt the doze */
#define ISA_SLEEP_ARG (0x10 | ARCV2_IRQ_DEF_PRIO)
#ifndef __ASSEMBLY__
/*
* Save IRQ state and disable IRQs
*/
static inline long arch_local_irq_save(void)
{
unsigned long flags;
__asm__ __volatile__(" clri %0 \n" : "=r" (flags) : : "memory");
return flags;
}
/*
* restore saved IRQ state
*/
static inline void arch_local_irq_restore(unsigned long flags)
{
__asm__ __volatile__(" seti %0 \n" : : "r" (flags) : "memory");
}
/*
* Unconditionally Enable IRQs
*/
static inline void arch_local_irq_enable(void)
{
unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
if (irqact & 0xffff)
write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
__asm__ __volatile__(" seti \n" : : : "memory");
}
/*
* Unconditionally Disable IRQs
*/
static inline void arch_local_irq_disable(void)
{
__asm__ __volatile__(" clri \n" : : : "memory");
}
/*
* save IRQ state
*/
static inline long arch_local_save_flags(void)
{
unsigned long temp;
__asm__ __volatile__(
" lr %0, [status32] \n"
: "=&r"(temp)
:
: "memory");
return temp;
}
/*
* Query IRQ state
*/
static inline int arch_irqs_disabled_flags(unsigned long flags)
{
return !(flags & (STATUS_IE_MASK));
}
static inline int arch_irqs_disabled(void)
{
return arch_irqs_disabled_flags(arch_local_save_flags());
}
#else
.macro IRQ_DISABLE scratch
clri
.endm
.macro IRQ_ENABLE scratch
seti
.endm
#endif /* __ASSEMBLY__ */
#endif
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