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 /* status32 Bits as encoded/expected by CLRI/SETI */
22 #define CLRI_STATUS_IE_BIT	4
23 
24 #define CLRI_STATUS_E_MASK	0xF
25 #define CLRI_STATUS_IE_MASK	(1 << CLRI_STATUS_IE_BIT)
26 
27 #define AUX_USER_SP		0x00D
28 #define AUX_IRQ_CTRL		0x00E
29 #define AUX_IRQ_ACT		0x043	/* Active Intr across all levels */
30 #define AUX_IRQ_LVL_PEND	0x200	/* Pending Intr across all levels */
31 #define AUX_IRQ_HINT		0x201	/* For generating Soft Interrupts */
32 #define AUX_IRQ_PRIORITY	0x206
33 #define ICAUSE			0x40a
34 #define AUX_IRQ_SELECT		0x40b
35 #define AUX_IRQ_ENABLE		0x40c
36 
37 /* Was Intr taken in User Mode */
38 #define AUX_IRQ_ACT_BIT_U	31
39 
40 /*
41  * User space should be interruptable even by lowest prio interrupt
42  * Safe even if actual interrupt priorities is fewer or even one
43  */
44 #define ARCV2_IRQ_DEF_PRIO	15
45 
46 /* seed value for status register */
47 #define ISA_INIT_STATUS_BITS	(STATUS_IE_MASK | STATUS_AD_MASK | \
48 					(ARCV2_IRQ_DEF_PRIO << 1))
49 
50 /* SLEEP needs default irq priority (<=) which can interrupt the doze */
51 #define ISA_SLEEP_ARG		(0x10 | ARCV2_IRQ_DEF_PRIO)
52 
53 #ifndef __ASSEMBLY__
54 
55 /*
56  * Save IRQ state and disable IRQs
57  */
58 static inline long arch_local_irq_save(void)
59 {
60 	unsigned long flags;
61 
62 	__asm__ __volatile__("	clri %0	\n" : "=r" (flags) : : "memory");
63 
64 	return flags;
65 }
66 
67 /*
68  * restore saved IRQ state
69  */
70 static inline void arch_local_irq_restore(unsigned long flags)
71 {
72 	__asm__ __volatile__("	seti %0	\n" : : "r" (flags) : "memory");
73 }
74 
75 /*
76  * Unconditionally Enable IRQs
77  */
78 static inline void arch_local_irq_enable(void)
79 {
80 	unsigned int irqact = read_aux_reg(AUX_IRQ_ACT);
81 
82 	if (irqact & 0xffff)
83 		write_aux_reg(AUX_IRQ_ACT, irqact & ~0xffff);
84 
85 	__asm__ __volatile__("	seti	\n" : : : "memory");
86 }
87 
88 /*
89  * Unconditionally Disable IRQs
90  */
91 static inline void arch_local_irq_disable(void)
92 {
93 	__asm__ __volatile__("	clri	\n" : : : "memory");
94 }
95 
96 /*
97  * save IRQ state
98  */
99 static inline long arch_local_save_flags(void)
100 {
101 	unsigned long temp;
102 
103 	__asm__ __volatile__(
104 	"	lr  %0, [status32]	\n"
105 	: "=&r"(temp)
106 	:
107 	: "memory");
108 
109 	/* To be compatible with irq_save()/irq_restore()
110 	 * encode the irq bits as expected by CLRI/SETI
111 	 * (this was needed to make CONFIG_TRACE_IRQFLAGS work)
112 	 */
113 	temp = (1 << 5) |
114 		((!!(temp & STATUS_IE_MASK)) << CLRI_STATUS_IE_BIT) |
115 		(temp & CLRI_STATUS_E_MASK);
116 	return temp;
117 }
118 
119 /*
120  * Query IRQ state
121  */
122 static inline int arch_irqs_disabled_flags(unsigned long flags)
123 {
124 	return !(flags & CLRI_STATUS_IE_MASK);
125 }
126 
127 static inline int arch_irqs_disabled(void)
128 {
129 	return arch_irqs_disabled_flags(arch_local_save_flags());
130 }
131 
132 static inline void arc_softirq_trigger(int irq)
133 {
134 	write_aux_reg(AUX_IRQ_HINT, irq);
135 }
136 
137 static inline void arc_softirq_clear(int irq)
138 {
139 	write_aux_reg(AUX_IRQ_HINT, 0);
140 }
141 
142 #else
143 
144 #ifdef CONFIG_TRACE_IRQFLAGS
145 
146 .macro TRACE_ASM_IRQ_DISABLE
147 	bl	trace_hardirqs_off
148 .endm
149 
150 .macro TRACE_ASM_IRQ_ENABLE
151 	bl	trace_hardirqs_on
152 .endm
153 
154 #else
155 
156 .macro TRACE_ASM_IRQ_DISABLE
157 .endm
158 
159 .macro TRACE_ASM_IRQ_ENABLE
160 .endm
161 
162 #endif
163 .macro IRQ_DISABLE  scratch
164 	clri
165 	TRACE_ASM_IRQ_DISABLE
166 .endm
167 
168 .macro IRQ_ENABLE  scratch
169 	TRACE_ASM_IRQ_ENABLE
170 	seti
171 .endm
172 
173 #endif	/* __ASSEMBLY__ */
174 
175 #endif
176