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