arch/powerpc/include/asm/hw_irq.h

   1 /*
   2  * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
   3  */
   4 #ifndef _ASM_POWERPC_HW_IRQ_H
   5 #define _ASM_POWERPC_HW_IRQ_H
   6
   7 #ifdef __KERNEL__
   8
   9 #include <linux/errno.h>
  10 #include <linux/compiler.h>
  11 #include <asm/ptrace.h>
  12 #include <asm/processor.h>
  13
  14 #ifdef CONFIG_PPC64
  15
  16 /*
  17  * PACA flags in paca->irq_happened.
  18  *
  19  * This bits are set when interrupts occur while soft-disabled
  20  * and allow a proper replay. Additionally, PACA_IRQ_HARD_DIS
  21  * is set whenever we manually hard disable.
  22  */
  23 #define PACA_IRQ_HARD_DIS       0x01
  24 #define PACA_IRQ_DBELL          0x02
  25 #define PACA_IRQ_EE             0x04
  26 #define PACA_IRQ_DEC            0x08 /* Or FIT */
  27 #define PACA_IRQ_EE_EDGE        0x10 /* BookE only */
  28 #define PACA_IRQ_HMI            0x20
  29
  30 #endif /* CONFIG_PPC64 */
  31
  32 #ifndef __ASSEMBLY__
  33
  34 extern void __replay_interrupt(unsigned int vector);
  35
  36 extern void timer_interrupt(struct pt_regs *);
  37 extern void performance_monitor_exception(struct pt_regs *regs);
  38 extern void WatchdogException(struct pt_regs *regs);
  39 extern void unknown_exception(struct pt_regs *regs);
  40
  41 #ifdef CONFIG_PPC64
  42 #include <asm/paca.h>
  43
  44 static inline unsigned long arch_local_save_flags(void)
  45 {
  46         unsigned long flags;
  47
  48         asm volatile(
  49                 "lbz %0,%1(13)"
  50                 : "=r" (flags)
  51                 : "i" (offsetof(struct paca_struct, soft_enabled)));
  52
  53         return flags;
  54 }
  55
  56 static inline unsigned long arch_local_irq_disable(void)
  57 {
  58         unsigned long flags, zero;
  59
  60         asm volatile(
  61                 "li %1,0; lbz %0,%2(13); stb %1,%2(13)"
  62                 : "=r" (flags), "=&r" (zero)
  63                 : "i" (offsetof(struct paca_struct, soft_enabled))
  64                 : "memory");
  65
  66         return flags;
  67 }
  68
  69 extern void arch_local_irq_restore(unsigned long);
  70
  71 static inline void arch_local_irq_enable(void)
  72 {
  73         arch_local_irq_restore(1);
  74 }
  75
  76 static inline unsigned long arch_local_irq_save(void)
  77 {
  78         return arch_local_irq_disable();
  79 }
  80
  81 static inline bool arch_irqs_disabled_flags(unsigned long flags)
  82 {
  83         return flags == 0;
  84 }
  85
  86 static inline bool arch_irqs_disabled(void)
  87 {
  88         return arch_irqs_disabled_flags(arch_local_save_flags());
  89 }
  90
  91 #ifdef CONFIG_PPC_BOOK3E
  92 #define __hard_irq_enable()     asm volatile("wrteei 1" : : : "memory")
  93 #define __hard_irq_disable()    asm volatile("wrteei 0" : : : "memory")
  94 #else
  95 #define __hard_irq_enable()     __mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
  96 #define __hard_irq_disable()    __mtmsrd(local_paca->kernel_msr, 1)
  97 #endif
  98
  99 #define hard_irq_disable()      do {                    \
 100         u8 _was_enabled;                                \
 101         __hard_irq_disable();                           \
 102         _was_enabled = local_paca->soft_enabled;        \
 103         local_paca->soft_enabled = 0;                   \
 104         local_paca->irq_happened |= PACA_IRQ_HARD_DIS;  \
 105         if (_was_enabled)                               \
 106                 trace_hardirqs_off();                   \
 107 } while(0)
 108
 109 static inline bool lazy_irq_pending(void)
 110 {
 111         return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
 112 }
 113
 114 /*
 115  * This is called by asynchronous interrupts to conditionally
 116  * re-enable hard interrupts when soft-disabled after having
 117  * cleared the source of the interrupt
 118  */
 119 static inline void may_hard_irq_enable(void)
 120 {
 121         get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
 122         if (!(get_paca()->irq_happened & PACA_IRQ_EE))
 123                 __hard_irq_enable();
 124 }
 125
 126 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 127 {
 128         return !regs->softe;
 129 }
 130
 131 extern bool prep_irq_for_idle(void);
 132
 133 #else /* CONFIG_PPC64 */
 134
 135 #define SET_MSR_EE(x)   mtmsr(x)
 136
 137 static inline unsigned long arch_local_save_flags(void)
 138 {
 139         return mfmsr();
 140 }
 141
 142 static inline void arch_local_irq_restore(unsigned long flags)
 143 {
 144 #if defined(CONFIG_BOOKE)
 145         asm volatile("wrtee %0" : : "r" (flags) : "memory");
 146 #else
 147         mtmsr(flags);
 148 #endif
 149 }
 150
 151 static inline unsigned long arch_local_irq_save(void)
 152 {
 153         unsigned long flags = arch_local_save_flags();
 154 #ifdef CONFIG_BOOKE
 155         asm volatile("wrteei 0" : : : "memory");
 156 #else
 157         SET_MSR_EE(flags & ~MSR_EE);
 158 #endif
 159         return flags;
 160 }
 161
 162 static inline void arch_local_irq_disable(void)
 163 {
 164 #ifdef CONFIG_BOOKE
 165         asm volatile("wrteei 0" : : : "memory");
 166 #else
 167         arch_local_irq_save();
 168 #endif
 169 }
 170
 171 static inline void arch_local_irq_enable(void)
 172 {
 173 #ifdef CONFIG_BOOKE
 174         asm volatile("wrteei 1" : : : "memory");
 175 #else
 176         unsigned long msr = mfmsr();
 177         SET_MSR_EE(msr | MSR_EE);
 178 #endif
 179 }
 180
 181 static inline bool arch_irqs_disabled_flags(unsigned long flags)
 182 {
 183         return (flags & MSR_EE) == 0;
 184 }
 185
 186 static inline bool arch_irqs_disabled(void)
 187 {
 188         return arch_irqs_disabled_flags(arch_local_save_flags());
 189 }
 190
 191 #define hard_irq_disable()              arch_local_irq_disable()
 192
 193 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 194 {
 195         return !(regs->msr & MSR_EE);
 196 }
 197
 198 static inline void may_hard_irq_enable(void) { }
 199
 200 #endif /* CONFIG_PPC64 */
 201
 202 #define ARCH_IRQ_INIT_FLAGS     IRQ_NOREQUEST
 203
 204 /*
 205  * interrupt-retrigger: should we handle this via lost interrupts and IPIs
 206  * or should we not care like we do now ? --BenH.
 207  */
 208 struct irq_chip;
 209
 210 #endif  /* __ASSEMBLY__ */
 211 #endif  /* __KERNEL__ */
 212 #endif  /* _ASM_POWERPC_HW_IRQ_H */