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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