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/*
* interface to Blackfin CEC
*
* Copyright 2009 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
#ifndef __ASM_BFIN_IRQFLAGS_H__
#define __ASM_BFIN_IRQFLAGS_H__
#include <mach/blackfin.h>
#ifdef CONFIG_SMP
# include <asm/pda.h>
# include <asm/processor.h>
# define bfin_irq_flags cpu_pda[blackfin_core_id()].imask
#else
extern unsigned long bfin_irq_flags;
#endif
static inline notrace void bfin_sti(unsigned long flags)
{
asm volatile("sti %0;" : : "d" (flags));
}
static inline notrace unsigned long bfin_cli(void)
{
unsigned long flags;
asm volatile("cli %0;" : "=d" (flags));
return flags;
}
#ifdef CONFIG_DEBUG_HWERR
# define bfin_no_irqs 0x3f
#else
# define bfin_no_irqs 0x1f
#endif
/*****************************************************************************/
/*
* Hard, untraced CPU interrupt flag manipulation and access.
*/
static inline notrace void __hard_local_irq_disable(void)
{
bfin_cli();
}
static inline notrace void __hard_local_irq_enable(void)
{
bfin_sti(bfin_irq_flags);
}
static inline notrace unsigned long hard_local_save_flags(void)
{
return bfin_read_IMASK();
}
static inline notrace unsigned long __hard_local_irq_save(void)
{
unsigned long flags;
flags = bfin_cli();
#ifdef CONFIG_DEBUG_HWERR
bfin_sti(0x3f);
#endif
return flags;
}
static inline notrace int hard_irqs_disabled_flags(unsigned long flags)
{
return (flags & ~0x3f) == 0;
}
static inline notrace int hard_irqs_disabled(void)
{
unsigned long flags = hard_local_save_flags();
return hard_irqs_disabled_flags(flags);
}
static inline notrace void __hard_local_irq_restore(unsigned long flags)
{
if (!hard_irqs_disabled_flags(flags))
__hard_local_irq_enable();
}
/*****************************************************************************/
/*
* Interrupt pipe handling.
*/
#ifdef CONFIG_IPIPE
#include <linux/compiler.h>
#include <linux/ipipe_trace.h>
/*
* Way too many inter-deps between low-level headers in this port, so
* we redeclare the required bits we cannot pick from
* <asm/ipipe_base.h> to prevent circular dependencies.
*/
void __ipipe_stall_root(void);
void __ipipe_unstall_root(void);
unsigned long __ipipe_test_root(void);
unsigned long __ipipe_test_and_stall_root(void);
void __ipipe_restore_root(unsigned long flags);
#ifdef CONFIG_IPIPE_DEBUG_CONTEXT
struct ipipe_domain;
extern struct ipipe_domain ipipe_root;
void ipipe_check_context(struct ipipe_domain *ipd);
#define __check_irqop_context(ipd) ipipe_check_context(&ipipe_root)
#else /* !CONFIG_IPIPE_DEBUG_CONTEXT */
#define __check_irqop_context(ipd) do { } while (0)
#endif /* !CONFIG_IPIPE_DEBUG_CONTEXT */
/*
* Interrupt pipe interface to linux/irqflags.h.
*/
static inline notrace void arch_local_irq_disable(void)
{
__check_irqop_context();
__ipipe_stall_root();
barrier();
}
static inline notrace void arch_local_irq_enable(void)
{
barrier();
__check_irqop_context();
__ipipe_unstall_root();
}
static inline notrace unsigned long arch_local_save_flags(void)
{
return __ipipe_test_root() ? bfin_no_irqs : bfin_irq_flags;
}
static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
{
return flags == bfin_no_irqs;
}
static inline notrace unsigned long arch_local_irq_save(void)
{
unsigned long flags;
__check_irqop_context();
flags = __ipipe_test_and_stall_root() ? bfin_no_irqs : bfin_irq_flags;
barrier();
return flags;
}
static inline notrace void arch_local_irq_restore(unsigned long flags)
{
__check_irqop_context();
__ipipe_restore_root(flags == bfin_no_irqs);
}
static inline notrace unsigned long arch_mangle_irq_bits(int virt, unsigned long real)
{
/*
* Merge virtual and real interrupt mask bits into a single
* 32bit word.
*/
return (real & ~(1 << 31)) | ((virt != 0) << 31);
}
static inline notrace int arch_demangle_irq_bits(unsigned long *x)
{
int virt = (*x & (1 << 31)) != 0;
*x &= ~(1L << 31);
return virt;
}
/*
* Interface to various arch routines that may be traced.
*/
#ifdef CONFIG_IPIPE_TRACE_IRQSOFF
static inline notrace void hard_local_irq_disable(void)
{
if (!hard_irqs_disabled()) {
__hard_local_irq_disable();
ipipe_trace_begin(0x80000000);
}
}
static inline notrace void hard_local_irq_enable(void)
{
if (hard_irqs_disabled()) {
ipipe_trace_end(0x80000000);
__hard_local_irq_enable();
}
}
static inline notrace unsigned long hard_local_irq_save(void)
{
unsigned long flags = hard_local_save_flags();
if (!hard_irqs_disabled_flags(flags)) {
__hard_local_irq_disable();
ipipe_trace_begin(0x80000001);
}
return flags;
}
static inline notrace void hard_local_irq_restore(unsigned long flags)
{
if (!hard_irqs_disabled_flags(flags)) {
ipipe_trace_end(0x80000001);
__hard_local_irq_enable();
}
}
#else /* !CONFIG_IPIPE_TRACE_IRQSOFF */
# define hard_local_irq_disable() __hard_local_irq_disable()
# define hard_local_irq_enable() __hard_local_irq_enable()
# define hard_local_irq_save() __hard_local_irq_save()
# define hard_local_irq_restore(flags) __hard_local_irq_restore(flags)
#endif /* !CONFIG_IPIPE_TRACE_IRQSOFF */
#define hard_local_irq_save_cond() hard_local_irq_save()
#define hard_local_irq_restore_cond(flags) hard_local_irq_restore(flags)
#else /* !CONFIG_IPIPE */
/*
* Direct interface to linux/irqflags.h.
*/
#define arch_local_save_flags() hard_local_save_flags()
#define arch_local_irq_save(flags) __hard_local_irq_save()
#define arch_local_irq_restore(flags) __hard_local_irq_restore(flags)
#define arch_local_irq_enable() __hard_local_irq_enable()
#define arch_local_irq_disable() __hard_local_irq_disable()
#define arch_irqs_disabled_flags(flags) hard_irqs_disabled_flags(flags)
#define arch_irqs_disabled() hard_irqs_disabled()
/*
* Interface to various arch routines that may be traced.
*/
#define hard_local_irq_save() __hard_local_irq_save()
#define hard_local_irq_restore(flags) __hard_local_irq_restore(flags)
#define hard_local_irq_enable() __hard_local_irq_enable()
#define hard_local_irq_disable() __hard_local_irq_disable()
#define hard_local_irq_save_cond() hard_local_save_flags()
#define hard_local_irq_restore_cond(flags) do { (void)(flags); } while (0)
#endif /* !CONFIG_IPIPE */
#ifdef CONFIG_SMP
#define hard_local_irq_save_smp() hard_local_irq_save()
#define hard_local_irq_restore_smp(flags) hard_local_irq_restore(flags)
#else
#define hard_local_irq_save_smp() hard_local_save_flags()
#define hard_local_irq_restore_smp(flags) do { (void)(flags); } while (0)
#endif
/*
* Remap the arch-neutral IRQ state manipulation macros to the
* blackfin-specific hard_local_irq_* API.
*/
#define local_irq_save_hw(flags) \
do { \
(flags) = hard_local_irq_save(); \
} while (0)
#define local_irq_restore_hw(flags) \
do { \
hard_local_irq_restore(flags); \
} while (0)
#define local_irq_disable_hw() \
do { \
hard_local_irq_disable(); \
} while (0)
#define local_irq_enable_hw() \
do { \
hard_local_irq_enable(); \
} while (0)
#define local_irq_save_hw_notrace(flags) \
do { \
(flags) = __hard_local_irq_save(); \
} while (0)
#define local_irq_restore_hw_notrace(flags) \
do { \
__hard_local_irq_restore(flags); \
} while (0)
#define irqs_disabled_hw() hard_irqs_disabled()
#endif
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