Logo Search packages:      
Sourcecode: linux version File versions  Download package

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__

#ifdef CONFIG_SMP
# include <asm/pda.h>
# include <asm/processor.h>
/* Forward decl needed due to cdef inter dependencies */
static inline uint32_t __pure bfin_dspid(void);
# define blackfin_core_id() (bfin_dspid() & 0xff)
# 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_IPIPE

#include <linux/ipipe_base.h>
#include <linux/ipipe_trace.h>

#ifdef CONFIG_DEBUG_HWERR
# define bfin_no_irqs 0x3f
#else
# define bfin_no_irqs 0x1f
#endif

#define raw_local_irq_disable()                       \
      do {                                \
            ipipe_check_context(ipipe_root_domain);   \
            __ipipe_stall_root();               \
            barrier();                    \
      } while (0)

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

#define raw_local_save_flags_ptr(x)                         \
      do {                                            \
            *(x) = __ipipe_test_root() ? bfin_no_irqs : bfin_irq_flags; \
      } while (0)

#define raw_local_save_flags(x)           raw_local_save_flags_ptr(&(x))

#define raw_irqs_disabled_flags(x)  ((x) == bfin_no_irqs)

#define raw_local_irq_save_ptr(x)                           \
      do {                                            \
            *(x) = __ipipe_test_and_stall_root() ? bfin_no_irqs : bfin_irq_flags; \
            barrier();                                \
      } while (0)

#define raw_local_irq_save(x)                   \
      do {                                \
            ipipe_check_context(ipipe_root_domain);   \
            raw_local_irq_save_ptr(&(x));       \
      } while (0)

static inline unsigned long raw_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 raw_demangle_irq_bits(unsigned long *x)
{
      int virt = (*x & (1 << 31)) != 0;
      *x &= ~(1L << 31);
      return virt;
}

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

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

#define local_save_flags_hw(flags)              \
      do {                                \
            (flags) = bfin_read_IMASK();        \
      } while (0)

#define irqs_disabled_flags_hw(flags) (((flags) & ~0x3f) == 0)

#define irqs_disabled_hw()                \
      ({                            \
      unsigned long flags;                \
      local_save_flags_hw(flags);         \
      irqs_disabled_flags_hw(flags);            \
      })

static inline void local_irq_save_ptr_hw(unsigned long *flags)
{
      *flags = bfin_cli();
#ifdef CONFIG_DEBUG_HWERR
      bfin_sti(0x3f);
#endif
}

#define local_irq_save_hw_notrace(flags)        \
      do {                                \
            local_irq_save_ptr_hw(&(flags));    \
      } while (0)

static inline void local_irq_restore_hw_notrace(unsigned long flags)
{
      if (!irqs_disabled_flags_hw(flags))
            local_irq_enable_hw_notrace();
}

#ifdef CONFIG_IPIPE_TRACE_IRQSOFF
# define local_irq_disable_hw()                       \
      do {                                \
            if (!irqs_disabled_hw()) {          \
                  local_irq_disable_hw_notrace();     \
                  ipipe_trace_begin(0x80000000);      \
            }                             \
      } while (0)
# define local_irq_enable_hw()                        \
      do {                                \
            if (irqs_disabled_hw()) {           \
                  ipipe_trace_end(0x80000000);  \
                  local_irq_enable_hw_notrace();      \
            }                             \
      } while (0)
# define local_irq_save_hw(flags)               \
      do {                                \
            local_save_flags_hw(flags);         \
            if (!irqs_disabled_flags_hw(flags)) {     \
                  local_irq_disable_hw_notrace();     \
                  ipipe_trace_begin(0x80000001);      \
            }                             \
      } while (0)
# define local_irq_restore_hw(flags)                  \
      do {                                \
            if (!irqs_disabled_flags_hw(flags)) {     \
                  ipipe_trace_end(0x80000001);  \
                  local_irq_enable_hw_notrace();      \
            }                             \
      } while (0)
#else /* !CONFIG_IPIPE_TRACE_IRQSOFF */
# define local_irq_disable_hw()           local_irq_disable_hw_notrace()
# define local_irq_enable_hw()            local_irq_enable_hw_notrace()
# define local_irq_save_hw(flags)   local_irq_save_hw_notrace(flags)
# define local_irq_restore_hw(flags)      local_irq_restore_hw_notrace(flags)
#endif /* !CONFIG_IPIPE_TRACE_IRQSOFF */

#else /* CONFIG_IPIPE */

static inline void raw_local_irq_disable(void)
{
      bfin_cli();
}
static inline void raw_local_irq_enable(void)
{
      bfin_sti(bfin_irq_flags);
}

#define raw_local_save_flags(flags) do { (flags) = bfin_read_IMASK(); } while (0)

#define raw_irqs_disabled_flags(flags) (((flags) & ~0x3f) == 0)

static inline unsigned long __raw_local_irq_save(void)
{
      unsigned long flags = bfin_cli();
#ifdef CONFIG_DEBUG_HWERR
      bfin_sti(0x3f);
#endif
      return flags;
}
#define raw_local_irq_save(flags) do { (flags) = __raw_local_irq_save(); } while (0)

#define local_irq_save_hw(flags)    raw_local_irq_save(flags)
#define local_irq_restore_hw(flags) raw_local_irq_restore(flags)
#define local_irq_enable_hw()       raw_local_irq_enable()
#define local_irq_disable_hw()            raw_local_irq_disable()
#define irqs_disabled_hw()          irqs_disabled()

#endif /* !CONFIG_IPIPE */

static inline void raw_local_irq_restore(unsigned long flags)
{
      if (!raw_irqs_disabled_flags(flags))
            raw_local_irq_enable();
}

#endif

Generated by  Doxygen 1.6.0   Back to index