arch/arc/include/asm/irqflags.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 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_ARC_IRQFLAGS_H
  10 #define __ASM_ARC_IRQFLAGS_H
  11
  12 /* vineetg: March 2010 : local_irq_save( ) optimisation
  13  *  -Remove explicit mov of current status32 into reg, that is not needed
  14  *  -Use BIC  insn instead of INVERTED + AND
  15  *  -Conditionally disable interrupts (if they are not enabled, don't disable)
  16 */
  17
  18 #ifdef __KERNEL__
  19
  20 #include <asm/arcregs.h>
  21
  22 #ifndef __ASSEMBLY__
  23
  24 /******************************************************************
  25  * IRQ Control Macros
  26  ******************************************************************/
  27
  28 /*
  29  * Save IRQ state and disable IRQs
  30  */
  31 static inline long arch_local_irq_save(void)
  32 {
  33         unsigned long temp, flags;
  34
  35         __asm__ __volatile__(
  36         "       lr  %1, [status32]      \n"
  37         "       bic %0, %1, %2          \n"
  38         "       and.f 0, %1, %2 \n"
  39         "       flag.nz %0              \n"
  40         : "=r"(temp), "=r"(flags)
  41         : "n"((STATUS_E1_MASK | STATUS_E2_MASK))
  42         : "cc");
  43
  44         return flags;
  45 }
  46
  47 /*
  48  * restore saved IRQ state
  49  */
  50 static inline void arch_local_irq_restore(unsigned long flags)
  51 {
  52
  53         __asm__ __volatile__(
  54         "       flag %0                 \n"
  55         :
  56         : "r"(flags));
  57 }
  58
  59 /*
  60  * Unconditionally Enable IRQs
  61  */
  62 extern void arch_local_irq_enable(void);
  63
  64 /*
  65  * Unconditionally Disable IRQs
  66  */
  67 static inline void arch_local_irq_disable(void)
  68 {
  69         unsigned long temp;
  70
  71         __asm__ __volatile__(
  72         "       lr  %0, [status32]      \n"
  73         "       and %0, %0, %1          \n"
  74         "       flag %0                 \n"
  75         : "=&r"(temp)
  76         : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK)));
  77 }
  78
  79 /*
  80  * save IRQ state
  81  */
  82 static inline long arch_local_save_flags(void)
  83 {
  84         unsigned long temp;
  85
  86         __asm__ __volatile__(
  87         "       lr  %0, [status32]      \n"
  88         : "=&r"(temp));
  89
  90         return temp;
  91 }
  92
  93 /*
  94  * Query IRQ state
  95  */
  96 static inline int arch_irqs_disabled_flags(unsigned long flags)
  97 {
  98         return !(flags & (STATUS_E1_MASK
  99 #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
 100                         | STATUS_E2_MASK
 101 #endif
 102                 ));
 103 }
 104
 105 static inline int arch_irqs_disabled(void)
 106 {
 107         return arch_irqs_disabled_flags(arch_local_save_flags());
 108 }
 109
 110 static inline void arch_mask_irq(unsigned int irq)
 111 {
 112         unsigned int ienb;
 113
 114         ienb = read_aux_reg(AUX_IENABLE);
 115         ienb &= ~(1 << irq);
 116         write_aux_reg(AUX_IENABLE, ienb);
 117 }
 118
 119 static inline void arch_unmask_irq(unsigned int irq)
 120 {
 121         unsigned int ienb;
 122
 123         ienb = read_aux_reg(AUX_IENABLE);
 124         ienb |= (1 << irq);
 125         write_aux_reg(AUX_IENABLE, ienb);
 126 }
 127
 128 #else
 129
 130 .macro IRQ_DISABLE  scratch
 131         lr      \scratch, [status32]
 132         bic     \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
 133         flag    \scratch
 134 .endm
 135
 136 .macro IRQ_DISABLE_SAVE  scratch, save
 137         lr      \scratch, [status32]
 138         mov     \save, \scratch         /* Make a copy */
 139         bic     \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
 140         flag    \scratch
 141 .endm
 142
 143 .macro IRQ_ENABLE  scratch
 144         lr      \scratch, [status32]
 145         or      \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
 146         flag    \scratch
 147 .endm
 148
 149 #endif  /* __ASSEMBLY__ */
 150
 151 #endif  /* KERNEL */
 152
 153 #endif