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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)
/* status32 Bits as encoded/expected by CLRI/SETI */
#define CLRI_STATUS_IE_BIT 4
#define CLRI_STATUS_E_MASK 0xF
#define CLRI_STATUS_IE_MASK (1 << CLRI_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_HINT 0x201 /* For generating Soft Interrupts */
#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
/*
* Hardware supports 16 priorities (0 highest, 15 lowest)
* Linux by default runs at 1, priority 0 reserved for NMI style interrupts
*/
#define ARCV2_IRQ_DEF_PRIO 1
/* seed value for status register */
#ifdef CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS
#define __AD_ENB STATUS_AD_MASK
#else
#define __AD_ENB 0
#endif
#define ISA_INIT_STATUS_BITS (STATUS_IE_MASK | __AD_ENB | \
(ARCV2_IRQ_DEF_PRIO << 1))
#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");
/* To be compatible with irq_save()/irq_restore()
* encode the irq bits as expected by CLRI/SETI
* (this was needed to make CONFIG_TRACE_IRQFLAGS work)
*/
temp = (1 << 5) |
((!!(temp & STATUS_IE_MASK)) << CLRI_STATUS_IE_BIT) |
((temp >> 1) & CLRI_STATUS_E_MASK);
return temp;
}
/*
* Query IRQ state
*/
static inline int arch_irqs_disabled_flags(unsigned long flags)
{
return !(flags & CLRI_STATUS_IE_MASK);
}
static inline int arch_irqs_disabled(void)
{
return arch_irqs_disabled_flags(arch_local_save_flags());
}
static inline void arc_softirq_trigger(int irq)
{
write_aux_reg(AUX_IRQ_HINT, irq);
}
static inline void arc_softirq_clear(int irq)
{
write_aux_reg(AUX_IRQ_HINT, 0);
}
#else
#ifdef CONFIG_TRACE_IRQFLAGS
.macro TRACE_ASM_IRQ_DISABLE
bl trace_hardirqs_off
.endm
.macro TRACE_ASM_IRQ_ENABLE
bl trace_hardirqs_on
.endm
#else
.macro TRACE_ASM_IRQ_DISABLE
.endm
.macro TRACE_ASM_IRQ_ENABLE
.endm
#endif
.macro IRQ_DISABLE scratch
clri
TRACE_ASM_IRQ_DISABLE
.endm
.macro IRQ_ENABLE scratch
TRACE_ASM_IRQ_ENABLE
seti
.endm
#endif /* __ASSEMBLY__ */
#endif
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