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_HINT            0x201   /* For generating Soft Interrupts */
  26 #define AUX_IRQ_PRIORITY        0x206
  27 #define ICAUSE                  0x40a
  28 #define AUX_IRQ_SELECT          0x40b
  29 #define AUX_IRQ_ENABLE          0x40c
  30
  31 /* Was Intr taken in User Mode */
  32 #define AUX_IRQ_ACT_BIT_U       31
  33
  34 /* 0 is highest level, but taken by FIRQs, if present in design */
  35 #define ARCV2_IRQ_DEF_PRIO              0
  36
  37 /* seed value for status register */
  38 #define ISA_INIT_STATUS_BITS    (STATUS_IE_MASK | STATUS_AD_MASK | \
  39                                         (ARCV2_IRQ_DEF_PRIO << 1))
  40
  41 /* SLEEP needs default irq priority (<=) which can interrupt the doze */
  42 #define ISA_SLEEP_ARG           (0x10 | ARCV2_IRQ_DEF_PRIO)
  43
  44 #ifndef __ASSEMBLY__
  45
  46 /*
  47  * Save IRQ state and disable IRQs
  48  */
  49 static inline long arch_local_irq_save(void)
  50 {
  51         unsigned long flags;
  52
  53         __asm__ __volatile__("  clri %0 \n" : "=r" (flags) : : "memory");
  54
  55         return flags;
  56 }
  57
  58 /*
  59  * restore saved IRQ state
  60  */
  61 static inline void arch_local_irq_restore(unsigned long flags)
  62 {
  63         __asm__ __volatile__("  seti %0 \n" : : "r" (flags) : "memory");
  64 }
  65
  66 /*
  67  * Unconditionally Enable IRQs
  68  */
  69 static inline void arch_local_irq_enable(void)
  70 {
  71         unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
  72
  73         if (irqact & 0xffff)
  74                 write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
  75
  76         __asm__ __volatile__("  seti    \n" : : : "memory");
  77 }
  78
  79 /*
  80  * Unconditionally Disable IRQs
  81  */
  82 static inline void arch_local_irq_disable(void)
  83 {
  84         __asm__ __volatile__("  clri    \n" : : : "memory");
  85 }
  86
  87 /*
  88  * save IRQ state
  89  */
  90 static inline long arch_local_save_flags(void)
  91 {
  92         unsigned long temp;
  93
  94         __asm__ __volatile__(
  95         "       lr  %0, [status32]      \n"
  96         : "=&r"(temp)
  97         :
  98         : "memory");
  99
 100         return temp;
 101 }
 102
 103 /*
 104  * Query IRQ state
 105  */
 106 static inline int arch_irqs_disabled_flags(unsigned long flags)
 107 {
 108         return !(flags & (STATUS_IE_MASK));
 109 }
 110
 111 static inline int arch_irqs_disabled(void)
 112 {
 113         return arch_irqs_disabled_flags(arch_local_save_flags());
 114 }
 115
 116 static inline void arc_softirq_trigger(int irq)
 117 {
 118         write_aux_reg(AUX_IRQ_HINT, irq);
 119 }
 120
 121 static inline void arc_softirq_clear(int irq)
 122 {
 123         write_aux_reg(AUX_IRQ_HINT, 0);
 124 }
 125
 126 #else
 127
 128 .macro IRQ_DISABLE  scratch
 129         clri
 130 .endm
 131
 132 .macro IRQ_ENABLE  scratch
 133         seti
 134 .endm
 135
 136 #endif  /* __ASSEMBLY__ */
 137
 138 #endif