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 #define ISA_INIT_STATUS_BITS    (STATUS_IE_MASK | STATUS_AD_MASK | \
  48                                         (ARCV2_IRQ_DEF_PRIO << 1))
  49
  50 #ifndef __ASSEMBLY__
  51
  52 /*
  53  * Save IRQ state and disable IRQs
  54  */
  55 static inline long arch_local_irq_save(void)
  56 {
  57         unsigned long flags;
  58
  59         __asm__ __volatile__("  clri %0 \n" : "=r" (flags) : : "memory");
  60
  61         return flags;
  62 }
  63
  64 /*
  65  * restore saved IRQ state
  66  */
  67 static inline void arch_local_irq_restore(unsigned long flags)
  68 {
  69         __asm__ __volatile__("  seti %0 \n" : : "r" (flags) : "memory");
  70 }
  71
  72 /*
  73  * Unconditionally Enable IRQs
  74  */
  75 static inline void arch_local_irq_enable(void)
  76 {
  77         unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
  78
  79         if (irqact & 0xffff)
  80                 write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
  81
  82         __asm__ __volatile__("  seti    \n" : : : "memory");
  83 }
  84
  85 /*
  86  * Unconditionally Disable IRQs
  87  */
  88 static inline void arch_local_irq_disable(void)
  89 {
  90         __asm__ __volatile__("  clri    \n" : : : "memory");
  91 }
  92
  93 /*
  94  * save IRQ state
  95  */
  96 static inline long arch_local_save_flags(void)
  97 {
  98         unsigned long temp;
  99
 100         __asm__ __volatile__(
 101         "       lr  %0, [status32]      \n"
 102         : "=&r"(temp)
 103         :
 104         : "memory");
 105
 106         /* To be compatible with irq_save()/irq_restore()
 107          * encode the irq bits as expected by CLRI/SETI
 108          * (this was needed to make CONFIG_TRACE_IRQFLAGS work)
 109          */
 110         temp = (1 << 5) |
 111                 ((!!(temp & STATUS_IE_MASK)) << CLRI_STATUS_IE_BIT) |
 112                 ((temp >> 1) & CLRI_STATUS_E_MASK);
 113         return temp;
 114 }
 115
 116 /*
 117  * Query IRQ state
 118  */
 119 static inline int arch_irqs_disabled_flags(unsigned long flags)
 120 {
 121         return !(flags & CLRI_STATUS_IE_MASK);
 122 }
 123
 124 static inline int arch_irqs_disabled(void)
 125 {
 126         return arch_irqs_disabled_flags(arch_local_save_flags());
 127 }
 128
 129 static inline void arc_softirq_trigger(int irq)
 130 {
 131         write_aux_reg(AUX_IRQ_HINT, irq);
 132 }
 133
 134 static inline void arc_softirq_clear(int irq)
 135 {
 136         write_aux_reg(AUX_IRQ_HINT, 0);
 137 }
 138
 139 #else
 140
 141 #ifdef CONFIG_TRACE_IRQFLAGS
 142
 143 .macro TRACE_ASM_IRQ_DISABLE
 144         bl      trace_hardirqs_off
 145 .endm
 146
 147 .macro TRACE_ASM_IRQ_ENABLE
 148         bl      trace_hardirqs_on
 149 .endm
 150
 151 #else
 152
 153 .macro TRACE_ASM_IRQ_DISABLE
 154 .endm
 155
 156 .macro TRACE_ASM_IRQ_ENABLE
 157 .endm
 158
 159 #endif
 160 .macro IRQ_DISABLE  scratch
 161         clri
 162         TRACE_ASM_IRQ_DISABLE
 163 .endm
 164
 165 .macro IRQ_ENABLE  scratch
 166         TRACE_ASM_IRQ_ENABLE
 167         seti
 168 .endm
 169
 170 #endif  /* __ASSEMBLY__ */
 171
 172 #endif