summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/include/asm/hw_irq.h
blob: 102abd6dbc0a811172a9e16b8e5470c9d64396e0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/*
 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
 */
#ifndef _ASM_POWERPC_HW_IRQ_H
#define _ASM_POWERPC_HW_IRQ_H

#ifdef __KERNEL__

#include <linux/errno.h>
#include <linux/compiler.h>
#include <asm/ptrace.h>
#include <asm/processor.h>

#ifdef CONFIG_PPC64

/*
 * PACA flags in paca->irq_happened.
 *
 * This bits are set when interrupts occur while soft-disabled
 * and allow a proper replay. Additionally, PACA_IRQ_HARD_DIS
 * is set whenever we manually hard disable.
 */
#define PACA_IRQ_HARD_DIS	0x01
#define PACA_IRQ_DBELL		0x02
#define PACA_IRQ_EE		0x04
#define PACA_IRQ_DEC		0x08 /* Or FIT */
#define PACA_IRQ_EE_EDGE	0x10 /* BookE only */

#endif /* CONFIG_PPC64 */

#ifndef __ASSEMBLY__

extern void __replay_interrupt(unsigned int vector);

extern void timer_interrupt(struct pt_regs *);

#ifdef CONFIG_PPC64
#include <asm/paca.h>

static inline unsigned long arch_local_save_flags(void)
{
	unsigned long flags;

	asm volatile(
		"lbz %0,%1(13)"
		: "=r" (flags)
		: "i" (offsetof(struct paca_struct, soft_enabled)));

	return flags;
}

static inline unsigned long arch_local_irq_disable(void)
{
	unsigned long flags, zero;

	asm volatile(
		"li %1,0; lbz %0,%2(13); stb %1,%2(13)"
		: "=r" (flags), "=&r" (zero)
		: "i" (offsetof(struct paca_struct, soft_enabled))
		: "memory");

	return flags;
}

extern void arch_local_irq_restore(unsigned long);

static inline void arch_local_irq_enable(void)
{
	arch_local_irq_restore(1);
}

static inline unsigned long arch_local_irq_save(void)
{
	return arch_local_irq_disable();
}

static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
	return flags == 0;
}

static inline bool arch_irqs_disabled(void)
{
	return arch_irqs_disabled_flags(arch_local_save_flags());
}

#ifdef CONFIG_PPC_BOOK3E
#define __hard_irq_enable()	asm volatile("wrteei 1" : : : "memory");
#define __hard_irq_disable()	asm volatile("wrteei 0" : : : "memory");
#else
#define __hard_irq_enable()	__mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
#define __hard_irq_disable()	__mtmsrd(local_paca->kernel_msr, 1)
#endif

static inline void hard_irq_disable(void)
{
	__hard_irq_disable();
	get_paca()->soft_enabled = 0;
	get_paca()->irq_happened |= PACA_IRQ_HARD_DIS;
}

/* include/linux/interrupt.h needs hard_irq_disable to be a macro */
#define hard_irq_disable	hard_irq_disable

/*
 * This is called by asynchronous interrupts to conditionally
 * re-enable hard interrupts when soft-disabled after having
 * cleared the source of the interrupt
 */
static inline void may_hard_irq_enable(void)
{
	get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
	if (!(get_paca()->irq_happened & PACA_IRQ_EE))
		__hard_irq_enable();
}

static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
{
	return !regs->softe;
}

#else /* CONFIG_PPC64 */

#define SET_MSR_EE(x)	mtmsr(x)

static inline unsigned long arch_local_save_flags(void)
{
	return mfmsr();
}

static inline void arch_local_irq_restore(unsigned long flags)
{
#if defined(CONFIG_BOOKE)
	asm volatile("wrtee %0" : : "r" (flags) : "memory");
#else
	mtmsr(flags);
#endif
}

static inline unsigned long arch_local_irq_save(void)
{
	unsigned long flags = arch_local_save_flags();
#ifdef CONFIG_BOOKE
	asm volatile("wrteei 0" : : : "memory");
#else
	SET_MSR_EE(flags & ~MSR_EE);
#endif
	return flags;
}

static inline void arch_local_irq_disable(void)
{
#ifdef CONFIG_BOOKE
	asm volatile("wrteei 0" : : : "memory");
#else
	arch_local_irq_save();
#endif
}

static inline void arch_local_irq_enable(void)
{
#ifdef CONFIG_BOOKE
	asm volatile("wrteei 1" : : : "memory");
#else
	unsigned long msr = mfmsr();
	SET_MSR_EE(msr | MSR_EE);
#endif
}

static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
	return (flags & MSR_EE) == 0;
}

static inline bool arch_irqs_disabled(void)
{
	return arch_irqs_disabled_flags(arch_local_save_flags());
}

#define hard_irq_disable()		arch_local_irq_disable()

static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
{
	return !(regs->msr & MSR_EE);
}

static inline void may_hard_irq_enable(void) { }

#endif /* CONFIG_PPC64 */

#define ARCH_IRQ_INIT_FLAGS	IRQ_NOREQUEST

/*
 * interrupt-retrigger: should we handle this via lost interrupts and IPIs
 * or should we not care like we do now ? --BenH.
 */
struct irq_chip;

#endif  /* __ASSEMBLY__ */
#endif	/* __KERNEL__ */
#endif	/* _ASM_POWERPC_HW_IRQ_H */