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 /* SLEEP needs default irq priority (<=) which can interrupt the doze */
  41 #define ISA_SLEEP_ARG           (0x10 | ARCV2_IRQ_DEF_PRIO)
  42
  43 #ifndef __ASSEMBLY__
  44
  45 /*
  46  * Save IRQ state and disable IRQs
  47  */
  48 static inline long arch_local_irq_save(void)
  49 {
  50         unsigned long flags;
  51
  52         __asm__ __volatile__("  clri %0 \n" : "=r" (flags) : : "memory");
  53
  54         return flags;
  55 }
  56
  57 /*
  58  * restore saved IRQ state
  59  */
  60 static inline void arch_local_irq_restore(unsigned long flags)
  61 {
  62         __asm__ __volatile__("  seti %0 \n" : : "r" (flags) : "memory");
  63 }
  64
  65 /*
  66  * Unconditionally Enable IRQs
  67  */
  68 static inline void arch_local_irq_enable(void)
  69 {
  70         unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
  71
  72         if (irqact & 0xffff)
  73                 write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
  74
  75         __asm__ __volatile__("  seti    \n" : : : "memory");
  76 }
  77
  78 /*
  79  * Unconditionally Disable IRQs
  80  */
  81 static inline void arch_local_irq_disable(void)
  82 {
  83         __asm__ __volatile__("  clri    \n" : : : "memory");
  84 }
  85
  86 /*
  87  * save IRQ state
  88  */
  89 static inline long arch_local_save_flags(void)
  90 {
  91         unsigned long temp;
  92
  93         __asm__ __volatile__(
  94         "       lr  %0, [status32]      \n"
  95         : "=&r"(temp)
  96         :
  97         : "memory");
  98
  99         return temp;
 100 }
 101
 102 /*
 103  * Query IRQ state
 104  */
 105 static inline int arch_irqs_disabled_flags(unsigned long flags)
 106 {
 107         return !(flags & (STATUS_IE_MASK));
 108 }
 109
 110 static inline int arch_irqs_disabled(void)
 111 {
 112         return arch_irqs_disabled_flags(arch_local_save_flags());
 113 }
 114
 115 #else
 116
 117 .macro IRQ_DISABLE  scratch
 118         clri
 119 .endm
 120
 121 .macro IRQ_ENABLE  scratch
 122         seti
 123 .endm
 124
 125 #endif  /* __ASSEMBLY__ */
 126
 127 #endif