1 /*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 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_ARC_IRQFLAGS_H
10 #define __ASM_ARC_IRQFLAGS_H
11
12 /* vineetg: March 2010 : local_irq_save( ) optimisation
13 * -Remove explicit mov of current status32 into reg, that is not needed
14 * -Use BIC insn instead of INVERTED + AND
15 * -Conditionally disable interrupts (if they are not enabled, don't disable)
16 */
17
18 #include <asm/arcregs.h>
19
20 /* status32 Reg bits related to Interrupt Handling */
21 #define STATUS_E1_BIT 1 /* Int 1 enable */
22 #define STATUS_E2_BIT 2 /* Int 2 enable */
23 #define STATUS_A1_BIT 3 /* Int 1 active */
24 #define STATUS_A2_BIT 4 /* Int 2 active */
25
26 #define STATUS_E1_MASK (1<<STATUS_E1_BIT)
27 #define STATUS_E2_MASK (1<<STATUS_E2_BIT)
28 #define STATUS_A1_MASK (1<<STATUS_A1_BIT)
29 #define STATUS_A2_MASK (1<<STATUS_A2_BIT)
30
31 /* Other Interrupt Handling related Aux regs */
32 #define AUX_IRQ_LEV 0x200 /* IRQ Priority: L1 or L2 */
33 #define AUX_IRQ_HINT 0x201 /* For generating Soft Interrupts */
34 #define AUX_IRQ_LV12 0x43 /* interrupt level register */
35
36 #define AUX_IENABLE 0x40c
37 #define AUX_ITRIGGER 0x40d
38 #define AUX_IPULSE 0x415
39
40 #ifndef __ASSEMBLY__
41
42 /******************************************************************
43 * IRQ Control Macros
44 ******************************************************************/
45
46 /*
47 * Save IRQ state and disable IRQs
48 */
arch_local_irq_save(void)49 static inline long arch_local_irq_save(void)
50 {
51 unsigned long temp, flags;
52
53 __asm__ __volatile__(
54 " lr %1, [status32] \n"
55 " bic %0, %1, %2 \n"
56 " and.f 0, %1, %2 \n"
57 " flag.nz %0 \n"
58 : "=r"(temp), "=r"(flags)
59 : "n"((STATUS_E1_MASK | STATUS_E2_MASK))
60 : "memory", "cc");
61
62 return flags;
63 }
64
65 /*
66 * restore saved IRQ state
67 */
arch_local_irq_restore(unsigned long flags)68 static inline void arch_local_irq_restore(unsigned long flags)
69 {
70
71 __asm__ __volatile__(
72 " flag %0 \n"
73 :
74 : "r"(flags)
75 : "memory");
76 }
77
78 /*
79 * Unconditionally Enable IRQs
80 */
81 extern void arch_local_irq_enable(void);
82
83 /*
84 * Unconditionally Disable IRQs
85 */
arch_local_irq_disable(void)86 static inline void arch_local_irq_disable(void)
87 {
88 unsigned long temp;
89
90 __asm__ __volatile__(
91 " lr %0, [status32] \n"
92 " and %0, %0, %1 \n"
93 " flag %0 \n"
94 : "=&r"(temp)
95 : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK))
96 : "memory");
97 }
98
99 /*
100 * save IRQ state
101 */
arch_local_save_flags(void)102 static inline long arch_local_save_flags(void)
103 {
104 unsigned long temp;
105
106 __asm__ __volatile__(
107 " lr %0, [status32] \n"
108 : "=&r"(temp)
109 :
110 : "memory");
111
112 return temp;
113 }
114
115 /*
116 * Query IRQ state
117 */
arch_irqs_disabled_flags(unsigned long flags)118 static inline int arch_irqs_disabled_flags(unsigned long flags)
119 {
120 return !(flags & (STATUS_E1_MASK
121 #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
122 | STATUS_E2_MASK
123 #endif
124 ));
125 }
126
arch_irqs_disabled(void)127 static inline int arch_irqs_disabled(void)
128 {
129 return arch_irqs_disabled_flags(arch_local_save_flags());
130 }
131
132 #else
133
134 #ifdef CONFIG_TRACE_IRQFLAGS
135
136 .macro TRACE_ASM_IRQ_DISABLE
137 bl trace_hardirqs_off
138 .endm
139
140 .macro TRACE_ASM_IRQ_ENABLE
141 bl trace_hardirqs_on
142 .endm
143
144 #else
145
146 .macro TRACE_ASM_IRQ_DISABLE
147 .endm
148
149 .macro TRACE_ASM_IRQ_ENABLE
150 .endm
151
152 #endif
153
154 .macro IRQ_DISABLE scratch
155 lr \scratch, [status32]
156 bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
157 flag \scratch
158 TRACE_ASM_IRQ_DISABLE
159 .endm
160
161 .macro IRQ_ENABLE scratch
162 TRACE_ASM_IRQ_ENABLE
163 lr \scratch, [status32]
164 or \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
165 flag \scratch
166 .endm
167
168 #endif /* __ASSEMBLY__ */
169
170 #endif
171