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_HINT		0x201	/* For generating Soft Interrupts */
26 #define AUX_IRQ_PRIORITY	0x206
27 #define ICAUSE			0x40a
28 #define AUX_IRQ_SELECT		0x40b
29 #define AUX_IRQ_ENABLE		0x40c
30 
31 /* Was Intr taken in User Mode */
32 #define AUX_IRQ_ACT_BIT_U	31
33 
34 /*
35  * User space should be interruptable even by lowest prio interrupt
36  * Safe even if actual interrupt priorities is fewer or even one
37  */
38 #define ARCV2_IRQ_DEF_PRIO	15
39 
40 /* seed value for status register */
41 #define ISA_INIT_STATUS_BITS	(STATUS_IE_MASK | STATUS_AD_MASK | \
42 					(ARCV2_IRQ_DEF_PRIO << 1))
43 
44 /* SLEEP needs default irq priority (<=) which can interrupt the doze */
45 #define ISA_SLEEP_ARG		(0x10 | ARCV2_IRQ_DEF_PRIO)
46 
47 #ifndef __ASSEMBLY__
48 
49 /*
50  * Save IRQ state and disable IRQs
51  */
52 static inline long arch_local_irq_save(void)
53 {
54 	unsigned long flags;
55 
56 	__asm__ __volatile__("	clri %0	\n" : "=r" (flags) : : "memory");
57 
58 	return flags;
59 }
60 
61 /*
62  * restore saved IRQ state
63  */
64 static inline void arch_local_irq_restore(unsigned long flags)
65 {
66 	__asm__ __volatile__("	seti %0	\n" : : "r" (flags) : "memory");
67 }
68 
69 /*
70  * Unconditionally Enable IRQs
71  */
72 static inline void arch_local_irq_enable(void)
73 {
74 	unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
75 
76 	if (irqact & 0xffff)
77 		write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
78 
79 	__asm__ __volatile__("	seti	\n" : : : "memory");
80 }
81 
82 /*
83  * Unconditionally Disable IRQs
84  */
85 static inline void arch_local_irq_disable(void)
86 {
87 	__asm__ __volatile__("	clri	\n" : : : "memory");
88 }
89 
90 /*
91  * save IRQ state
92  */
93 static inline long arch_local_save_flags(void)
94 {
95 	unsigned long temp;
96 
97 	__asm__ __volatile__(
98 	"	lr  %0, [status32]	\n"
99 	: "=&r"(temp)
100 	:
101 	: "memory");
102 
103 	return temp;
104 }
105 
106 /*
107  * Query IRQ state
108  */
109 static inline int arch_irqs_disabled_flags(unsigned long flags)
110 {
111 	return !(flags & (STATUS_IE_MASK));
112 }
113 
114 static inline int arch_irqs_disabled(void)
115 {
116 	return arch_irqs_disabled_flags(arch_local_save_flags());
117 }
118 
119 static inline void arc_softirq_trigger(int irq)
120 {
121 	write_aux_reg(AUX_IRQ_HINT, irq);
122 }
123 
124 static inline void arc_softirq_clear(int irq)
125 {
126 	write_aux_reg(AUX_IRQ_HINT, 0);
127 }
128 
129 #else
130 
131 .macro IRQ_DISABLE  scratch
132 	clri
133 .endm
134 
135 .macro IRQ_ENABLE  scratch
136 	seti
137 .endm
138 
139 #endif	/* __ASSEMBLY__ */
140 
141 #endif
142