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
arch_local_save_flags(void)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
arch_local_irq_disable(void)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
arch_local_irq_enable(void)71 static inline void arch_local_irq_enable(void)
72 {
73 arch_local_irq_restore(1);
74 }
75
arch_local_irq_save(void)76 static inline unsigned long arch_local_irq_save(void)
77 {
78 return arch_local_irq_disable();
79 }
80
arch_irqs_disabled_flags(unsigned long flags)81 static inline bool arch_irqs_disabled_flags(unsigned long flags)
82 {
83 return flags == 0;
84 }
85
arch_irqs_disabled(void)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
lazy_irq_pending(void)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 */
may_hard_irq_enable(void)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
arch_irq_disabled_regs(struct pt_regs * regs)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
arch_local_save_flags(void)137 static inline unsigned long arch_local_save_flags(void)
138 {
139 return mfmsr();
140 }
141
arch_local_irq_restore(unsigned long flags)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
arch_local_irq_save(void)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
arch_local_irq_disable(void)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
arch_local_irq_enable(void)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
arch_irqs_disabled_flags(unsigned long flags)181 static inline bool arch_irqs_disabled_flags(unsigned long flags)
182 {
183 return (flags & MSR_EE) == 0;
184 }
185
arch_irqs_disabled(void)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
arch_irq_disabled_regs(struct pt_regs * regs)193 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
194 {
195 return !(regs->msr & MSR_EE);
196 }
197
may_hard_irq_enable(void)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 */
213