1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
4 */
5
6 #ifndef __ASM_IRQFLAGS_ARCV2_H
7 #define __ASM_IRQFLAGS_ARCV2_H
8
9 #include <asm/arcregs.h>
10
11 /* status32 Bits */
12 #define STATUS_AD_BIT 19 /* Disable Align chk: core supports non-aligned */
13 #define STATUS_IE_BIT 31
14
15 #define STATUS_AD_MASK (1<<STATUS_AD_BIT)
16 #define STATUS_IE_MASK (1<<STATUS_IE_BIT)
17
18 /* status32 Bits as encoded/expected by CLRI/SETI */
19 #define CLRI_STATUS_IE_BIT 4
20
21 #define CLRI_STATUS_E_MASK 0xF
22 #define CLRI_STATUS_IE_MASK (1 << CLRI_STATUS_IE_BIT)
23
24 #define AUX_USER_SP 0x00D
25 #define AUX_IRQ_CTRL 0x00E
26 #define AUX_IRQ_ACT 0x043 /* Active Intr across all levels */
27 #define AUX_IRQ_LVL_PEND 0x200 /* Pending Intr across all levels */
28 #define AUX_IRQ_HINT 0x201 /* For generating Soft Interrupts */
29 #define AUX_IRQ_PRIORITY 0x206
30 #define ICAUSE 0x40a
31 #define AUX_IRQ_SELECT 0x40b
32 #define AUX_IRQ_ENABLE 0x40c
33
34 /* Was Intr taken in User Mode */
35 #define AUX_IRQ_ACT_BIT_U 31
36
37 /*
38 * Hardware supports 16 priorities (0 highest, 15 lowest)
39 * Linux by default runs at 1, priority 0 reserved for NMI style interrupts
40 */
41 #define ARCV2_IRQ_DEF_PRIO 1
42
43 /* seed value for status register */
44 #ifdef CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS
45 #define __AD_ENB STATUS_AD_MASK
46 #else
47 #define __AD_ENB 0
48 #endif
49
50 #define ISA_INIT_STATUS_BITS (STATUS_IE_MASK | __AD_ENB | \
51 (ARCV2_IRQ_DEF_PRIO << 1))
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 >> 1) & 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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.