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  * User space should be interruptable even by lowest prio interrupt
  42  * Safe even if actual interrupt priorities is fewer or even one
  43  */
  44 #define ARCV2_IRQ_DEF_PRIO      15
  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 /* SLEEP needs default irq priority (<=) which can interrupt the doze */
  51 #define ISA_SLEEP_ARG           (0x10 | ARCV2_IRQ_DEF_PRIO)
  52
  53 #ifndef __ASSEMBLY__
  54
  55 /*
  56  * Save IRQ state and disable IRQs
  57  */
  58 static inline long arch_local_irq_save(void)
  59 {
  60         unsigned long flags;
  61
  62         __asm__ __volatile__("  clri %0 \n" : "=r" (flags) : : "memory");
  63
  64         return flags;
  65 }
  66
  67 /*
  68  * restore saved IRQ state
  69  */
  70 static inline void arch_local_irq_restore(unsigned long flags)
  71 {
  72         __asm__ __volatile__("  seti %0 \n" : : "r" (flags) : "memory");
  73 }
  74
  75 /*
  76  * Unconditionally Enable IRQs
  77  */
  78 static inline void arch_local_irq_enable(void)
  79 {
  80         unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
  81
  82         if (irqact & 0xffff)
  83                 write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
  84
  85         __asm__ __volatile__("  seti    \n" : : : "memory");
  86 }
  87
  88 /*
  89  * Unconditionally Disable IRQs
  90  */
  91 static inline void arch_local_irq_disable(void)
  92 {
  93         __asm__ __volatile__("  clri    \n" : : : "memory");
  94 }
  95
  96 /*
  97  * save IRQ state
  98  */
  99 static inline long arch_local_save_flags(void)
 100 {
 101         unsigned long temp;
 102
 103         __asm__ __volatile__(
 104         "       lr  %0, [status32]      \n"
 105         : "=&r"(temp)
 106         :
 107         : "memory");
 108
 109         /* To be compatible with irq_save()/irq_restore()
 110          * encode the irq bits as expected by CLRI/SETI
 111          * (this was needed to make CONFIG_TRACE_IRQFLAGS work)
 112          */
 113         temp = (1 << 5) |
 114                 ((!!(temp & STATUS_IE_MASK)) << CLRI_STATUS_IE_BIT) |
 115                 ((temp >> 1) & CLRI_STATUS_E_MASK);
 116         return temp;
 117 }
 118
 119 /*
 120  * Query IRQ state
 121  */
 122 static inline int arch_irqs_disabled_flags(unsigned long flags)
 123 {
 124         return !(flags & CLRI_STATUS_IE_MASK);
 125 }
 126
 127 static inline int arch_irqs_disabled(void)
 128 {
 129         return arch_irqs_disabled_flags(arch_local_save_flags());
 130 }
 131
 132 static inline void arc_softirq_trigger(int irq)
 133 {
 134         write_aux_reg(AUX_IRQ_HINT, irq);
 135 }
 136
 137 static inline void arc_softirq_clear(int irq)
 138 {
 139         write_aux_reg(AUX_IRQ_HINT, 0);
 140 }
 141
 142 #else
 143
 144 #ifdef CONFIG_TRACE_IRQFLAGS
 145
 146 .macro TRACE_ASM_IRQ_DISABLE
 147         bl      trace_hardirqs_off
 148 .endm
 149
 150 .macro TRACE_ASM_IRQ_ENABLE
 151         bl      trace_hardirqs_on
 152 .endm
 153
 154 #else
 155
 156 .macro TRACE_ASM_IRQ_DISABLE
 157 .endm
 158
 159 .macro TRACE_ASM_IRQ_ENABLE
 160 .endm
 161
 162 #endif
 163 .macro IRQ_DISABLE  scratch
 164         clri
 165         TRACE_ASM_IRQ_DISABLE
 166 .endm
 167
 168 .macro IRQ_ENABLE  scratch
 169         TRACE_ASM_IRQ_ENABLE
 170         seti
 171 .endm
 172
 173 #endif  /* __ASSEMBLY__ */
 174
 175 #endif