arch/arc/include/asm/irqflags-arcv2.h

   1 /*
   2  * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef __ASM_IRQFLAGS_ARCV2_H
  10 #define __ASM_IRQFLAGS_ARCV2_H
  11
  12 #include <asm/arcregs.h>
  13
  14 /* status32 Bits */
  15 #define STATUS_AD_BIT   19   /* Disable Align chk: core supports non-aligned */
  16 #define STATUS_IE_BIT   31
  17
  18 #define STATUS_AD_MASK          (1<<STATUS_AD_BIT)
  19 #define STATUS_IE_MASK          (1<<STATUS_IE_BIT)
  20
  21 #define AUX_USER_SP             0x00D
  22 #define AUX_IRQ_CTRL            0x00E
  23 #define AUX_IRQ_ACT             0x043   /* Active Intr across all levels */
  24 #define AUX_IRQ_LVL_PEND        0x200   /* Pending Intr across all levels */
  25 #define AUX_IRQ_PRIORITY        0x206
  26 #define ICAUSE                  0x40a
  27 #define AUX_IRQ_SELECT          0x40b
  28 #define AUX_IRQ_ENABLE          0x40c
  29
  30 /* Was Intr taken in User Mode */
  31 #define AUX_IRQ_ACT_BIT_U       31
  32
  33 /* 0 is highest level, but taken by FIRQs, if present in design */
  34 #define ARCV2_IRQ_DEF_PRIO              0
  35
  36 /* seed value for status register */
  37 #define ISA_INIT_STATUS_BITS    (STATUS_IE_MASK | STATUS_AD_MASK | \
  38                                         (ARCV2_IRQ_DEF_PRIO << 1))
  39
  40 #ifndef __ASSEMBLY__
  41
  42 /*
  43  * Save IRQ state and disable IRQs
  44  */
  45 static inline long arch_local_irq_save(void)
  46 {
  47         unsigned long flags;
  48
  49         __asm__ __volatile__("  clri %0 \n" : "=r" (flags) : : "memory");
  50
  51         return flags;
  52 }
  53
  54 /*
  55  * restore saved IRQ state
  56  */
  57 static inline void arch_local_irq_restore(unsigned long flags)
  58 {
  59         __asm__ __volatile__("  seti %0 \n" : : "r" (flags) : "memory");
  60 }
  61
  62 /*
  63  * Unconditionally Enable IRQs
  64  */
  65 static inline void arch_local_irq_enable(void)
  66 {
  67         unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
  68
  69         if (irqact & 0xffff)
  70                 write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
  71
  72         __asm__ __volatile__("  seti    \n" : : : "memory");
  73 }
  74
  75 /*
  76  * Unconditionally Disable IRQs
  77  */
  78 static inline void arch_local_irq_disable(void)
  79 {
  80         __asm__ __volatile__("  clri    \n" : : : "memory");
  81 }
  82
  83 /*
  84  * save IRQ state
  85  */
  86 static inline long arch_local_save_flags(void)
  87 {
  88         unsigned long temp;
  89
  90         __asm__ __volatile__(
  91         "       lr  %0, [status32]      \n"
  92         : "=&r"(temp)
  93         :
  94         : "memory");
  95
  96         return temp;
  97 }
  98
  99 /*
 100  * Query IRQ state
 101  */
 102 static inline int arch_irqs_disabled_flags(unsigned long flags)
 103 {
 104         return !(flags & (STATUS_IE_MASK));
 105 }
 106
 107 static inline int arch_irqs_disabled(void)
 108 {
 109         return arch_irqs_disabled_flags(arch_local_save_flags());
 110 }
 111
 112 #else
 113
 114 .macro IRQ_DISABLE  scratch
 115         clri
 116 .endm
 117
 118 .macro IRQ_ENABLE  scratch
 119         seti
 120 .endm
 121
 122 #endif  /* __ASSEMBLY__ */
 123
 124 #endif