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irqflags.h

/*
 * 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 void bfin_sti(unsigned long flags)
{
      asm volatile("sti %0;" : : "d" (flags));
}

static inline 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 void __hard_local_irq_disable(void)
{
      bfin_cli();
}

static inline void __hard_local_irq_enable(void)
{
      bfin_sti(bfin_irq_flags);
}

static inline unsigned long hard_local_save_flags(void)
{
      return bfin_read_IMASK();
}

static inline 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 int hard_irqs_disabled_flags(unsigned long flags)
{
      return (flags & ~0x3f) == 0;
}

static inline int hard_irqs_disabled(void)
{
      unsigned long flags = hard_local_save_flags();
      return hard_irqs_disabled_flags(flags);
}

static inline 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_base.h>
#include <linux/ipipe_trace.h>

/*
 * Interrupt pipe interface to linux/irqflags.h.
 */
static inline void arch_local_irq_disable(void)
{
      ipipe_check_context(ipipe_root_domain);
      __ipipe_stall_root();
      barrier();
}

static inline void arch_local_irq_enable(void)
{
      barrier();
      ipipe_check_context(ipipe_root_domain);
      __ipipe_unstall_root();
}

static inline unsigned long arch_local_save_flags(void)
{
      return __ipipe_test_root() ? bfin_no_irqs : bfin_irq_flags;
}

static inline int arch_irqs_disabled_flags(unsigned long flags)
{
      return flags == bfin_no_irqs;
}

static inline void arch_local_irq_save_ptr(unsigned long *_flags)
{
      x = __ipipe_test_and_stall_root() ? bfin_no_irqs : bfin_irq_flags;
      barrier();
}

static inline unsigned long arch_local_irq_save(void)
{
      ipipe_check_context(ipipe_root_domain);
      return __hard_local_irq_save();
}

static inline 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 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 void hard_local_irq_disable(void)
{
      if (!hard_irqs_disabled()) {
            __hard_local_irq_disable();
            ipipe_trace_begin(0x80000000);
      }
}

static inline void hard_local_irq_enable(void)
{
      if (hard_irqs_disabled()) {
            ipipe_trace_end(0x80000000);
            __hard_local_irq_enable();
      }
}

static inline 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 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 */

#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()


#endif /* !CONFIG_IPIPE */
#endif

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