1 /*
2  * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8 
9 #ifndef __ASM_IRQFLAGS_ARCV2_H
10 #define __ASM_IRQFLAGS_ARCV2_H
11 
12 #include <asm/arcregs.h>
13 
14 /* status32 Bits */
15 #define STATUS_AD_BIT	19   /* Disable Align chk: core supports non-aligned */
16 #define STATUS_IE_BIT	31
17 
18 #define STATUS_AD_MASK		(1<<STATUS_AD_BIT)
19 #define STATUS_IE_MASK		(1<<STATUS_IE_BIT)
20 
21 #define AUX_USER_SP		0x00D
22 #define AUX_IRQ_CTRL		0x00E
23 #define AUX_IRQ_ACT		0x043	/* Active Intr across all levels */
24 #define AUX_IRQ_LVL_PEND	0x200	/* Pending Intr across all levels */
25 #define AUX_IRQ_PRIORITY	0x206
26 #define ICAUSE			0x40a
27 #define AUX_IRQ_SELECT		0x40b
28 #define AUX_IRQ_ENABLE		0x40c
29 
30 /* Was Intr taken in User Mode */
31 #define AUX_IRQ_ACT_BIT_U	31
32 
33 /* 0 is highest level, but taken by FIRQs, if present in design */
34 #define ARCV2_IRQ_DEF_PRIO		0
35 
36 /* seed value for status register */
37 #define ISA_INIT_STATUS_BITS	(STATUS_IE_MASK | STATUS_AD_MASK | \
38 					(ARCV2_IRQ_DEF_PRIO << 1))
39 
40 #ifndef __ASSEMBLY__
41 
42 /*
43  * Save IRQ state and disable IRQs
44  */
45 static inline long arch_local_irq_save(void)
46 {
47 	unsigned long flags;
48 
49 	__asm__ __volatile__("	clri %0	\n" : "=r" (flags) : : "memory");
50 
51 	return flags;
52 }
53 
54 /*
55  * restore saved IRQ state
56  */
57 static inline void arch_local_irq_restore(unsigned long flags)
58 {
59 	__asm__ __volatile__("	seti %0	\n" : : "r" (flags) : "memory");
60 }
61 
62 /*
63  * Unconditionally Enable IRQs
64  */
65 static inline void arch_local_irq_enable(void)
66 {
67 	unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
68 
69 	if (irqact & 0xffff)
70 		write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
71 
72 	__asm__ __volatile__("	seti	\n" : : : "memory");
73 }
74 
75 /*
76  * Unconditionally Disable IRQs
77  */
78 static inline void arch_local_irq_disable(void)
79 {
80 	__asm__ __volatile__("	clri	\n" : : : "memory");
81 }
82 
83 /*
84  * save IRQ state
85  */
86 static inline long arch_local_save_flags(void)
87 {
88 	unsigned long temp;
89 
90 	__asm__ __volatile__(
91 	"	lr  %0, [status32]	\n"
92 	: "=&r"(temp)
93 	:
94 	: "memory");
95 
96 	return temp;
97 }
98 
99 /*
100  * Query IRQ state
101  */
102 static inline int arch_irqs_disabled_flags(unsigned long flags)
103 {
104 	return !(flags & (STATUS_IE_MASK));
105 }
106 
107 static inline int arch_irqs_disabled(void)
108 {
109 	return arch_irqs_disabled_flags(arch_local_save_flags());
110 }
111 
112 #else
113 
114 .macro IRQ_DISABLE  scratch
115 	clri
116 .endm
117 
118 .macro IRQ_ENABLE  scratch
119 	seti
120 .endm
121 
122 #endif	/* __ASSEMBLY__ */
123 
124 #endif
125