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 /* status32 Bits as encoded/expected by CLRI/SETI */
  22 #define CLRI_STATUS_IE_BIT      4
  23
  24 #define CLRI_STATUS_E_MASK      0xF
  25 #define CLRI_STATUS_IE_MASK     (1 << CLRI_STATUS_IE_BIT)
  26
  27 #define AUX_USER_SP             0x00D
  28 #define AUX_IRQ_CTRL            0x00E
  29 #define AUX_IRQ_ACT             0x043   /* Active Intr across all levels */
  30 #define AUX_IRQ_LVL_PEND        0x200   /* Pending Intr across all levels */
  31 #define AUX_IRQ_HINT            0x201   /* For generating Soft Interrupts */
  32 #define AUX_IRQ_PRIORITY        0x206
  33 #define ICAUSE                  0x40a
  34 #define AUX_IRQ_SELECT          0x40b
  35 #define AUX_IRQ_ENABLE          0x40c
  36
  37 /* Was Intr taken in User Mode */
  38 #define AUX_IRQ_ACT_BIT_U       31
  39
  40 /*
  41  * Hardware supports 16 priorities (0 highest, 15 lowest)
  42  * Linux by default runs at 1, priority 0 reserved for NMI style interrupts
  43  */
  44 #define ARCV2_IRQ_DEF_PRIO      1
  45
  46 /* seed value for status register */
  47 #ifdef CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS
  48 #define __AD_ENB        STATUS_AD_MASK
  49 #else
  50 #define __AD_ENB        0
  51 #endif
  52
  53 #define ISA_INIT_STATUS_BITS    (STATUS_IE_MASK | __AD_ENB | \
  54                                         (ARCV2_IRQ_DEF_PRIO << 1))
  55
  56 #ifndef __ASSEMBLY__
  57
  58 /*
  59  * Save IRQ state and disable IRQs
  60  */
  61 static inline long arch_local_irq_save(void)
  62 {
  63         unsigned long flags;
  64
  65         __asm__ __volatile__("  clri %0 \n" : "=r" (flags) : : "memory");
  66
  67         return flags;
  68 }
  69
  70 /*
  71  * restore saved IRQ state
  72  */
  73 static inline void arch_local_irq_restore(unsigned long flags)
  74 {
  75         __asm__ __volatile__("  seti %0 \n" : : "r" (flags) : "memory");
  76 }
  77
  78 /*
  79  * Unconditionally Enable IRQs
  80  */
  81 static inline void arch_local_irq_enable(void)
  82 {
  83         unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
  84
  85         if (irqact & 0xffff)
  86                 write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
  87
  88         __asm__ __volatile__("  seti    \n" : : : "memory");
  89 }
  90
  91 /*
  92  * Unconditionally Disable IRQs
  93  */
  94 static inline void arch_local_irq_disable(void)
  95 {
  96         __asm__ __volatile__("  clri    \n" : : : "memory");
  97 }
  98
  99 /*
 100  * save IRQ state
 101  */
 102 static inline long arch_local_save_flags(void)
 103 {
 104         unsigned long temp;
 105
 106         __asm__ __volatile__(
 107         "       lr  %0, [status32]      \n"
 108         : "=&r"(temp)
 109         :
 110         : "memory");
 111
 112         /* To be compatible with irq_save()/irq_restore()
 113          * encode the irq bits as expected by CLRI/SETI
 114          * (this was needed to make CONFIG_TRACE_IRQFLAGS work)
 115          */
 116         temp = (1 << 5) |
 117                 ((!!(temp & STATUS_IE_MASK)) << CLRI_STATUS_IE_BIT) |
 118                 ((temp >> 1) & CLRI_STATUS_E_MASK);
 119         return temp;
 120 }
 121
 122 /*
 123  * Query IRQ state
 124  */
 125 static inline int arch_irqs_disabled_flags(unsigned long flags)
 126 {
 127         return !(flags & CLRI_STATUS_IE_MASK);
 128 }
 129
 130 static inline int arch_irqs_disabled(void)
 131 {
 132         return arch_irqs_disabled_flags(arch_local_save_flags());
 133 }
 134
 135 static inline void arc_softirq_trigger(int irq)
 136 {
 137         write_aux_reg(AUX_IRQ_HINT, irq);
 138 }
 139
 140 static inline void arc_softirq_clear(int irq)
 141 {
 142         write_aux_reg(AUX_IRQ_HINT, 0);
 143 }
 144
 145 #else
 146
 147 #ifdef CONFIG_TRACE_IRQFLAGS
 148
 149 .macro TRACE_ASM_IRQ_DISABLE
 150         bl      trace_hardirqs_off
 151 .endm
 152
 153 .macro TRACE_ASM_IRQ_ENABLE
 154         bl      trace_hardirqs_on
 155 .endm
 156
 157 #else
 158
 159 .macro TRACE_ASM_IRQ_DISABLE
 160 .endm
 161
 162 .macro TRACE_ASM_IRQ_ENABLE
 163 .endm
 164
 165 #endif
 166 .macro IRQ_DISABLE  scratch
 167         clri
 168         TRACE_ASM_IRQ_DISABLE
 169 .endm
 170
 171 .macro IRQ_ENABLE  scratch
 172         TRACE_ASM_IRQ_ENABLE
 173         seti
 174 .endm
 175
 176 #endif  /* __ASSEMBLY__ */
 177
 178 #endif