1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
4 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
5 */
6
7 #ifndef __ASM_IRQFLAGS_ARCOMPACT_H
8 #define __ASM_IRQFLAGS_ARCOMPACT_H
9
10 /* vineetg: March 2010 : local_irq_save( ) optimisation
11 * -Remove explicit mov of current status32 into reg, that is not needed
12 * -Use BIC insn instead of INVERTED + AND
13 * -Conditionally disable interrupts (if they are not enabled, don't disable)
14 */
15
16 #include <asm/arcregs.h>
17
18 /* status32 Reg bits related to Interrupt Handling */
19 #define STATUS_E1_BIT 1 /* Int 1 enable */
20 #define STATUS_E2_BIT 2 /* Int 2 enable */
21 #define STATUS_A1_BIT 3 /* Int 1 active */
22 #define STATUS_A2_BIT 4 /* Int 2 active */
23 #define STATUS_AE_BIT 5 /* Exception active */
24
25 #define STATUS_E1_MASK (1<<STATUS_E1_BIT)
26 #define STATUS_E2_MASK (1<<STATUS_E2_BIT)
27 #define STATUS_A1_MASK (1<<STATUS_A1_BIT)
28 #define STATUS_A2_MASK (1<<STATUS_A2_BIT)
29 #define STATUS_AE_MASK (1<<STATUS_AE_BIT)
30 #define STATUS_IE_MASK (STATUS_E1_MASK | STATUS_E2_MASK)
31
32 /* Other Interrupt Handling related Aux regs */
33 #define AUX_IRQ_LEV 0x200 /* IRQ Priority: L1 or L2 */
34 #define AUX_IRQ_HINT 0x201 /* For generating Soft Interrupts */
35 #define AUX_IRQ_LV12 0x43 /* interrupt level register */
36
37 #define AUX_IENABLE 0x40c
38 #define AUX_ITRIGGER 0x40d
39 #define AUX_IPULSE 0x415
40
41 #define ISA_INIT_STATUS_BITS STATUS_IE_MASK
42
43 #ifndef __ASSEMBLY__
44
45 /******************************************************************
46 * IRQ Control Macros
47 *
48 * All of them have "memory" clobber (compiler barrier) which is needed to
49 * ensure that LD/ST requiring irq safetly (R-M-W when LLSC is not available)
50 * are redone after IRQs are re-enabled (and gcc doesn't reuse stale register)
51 *
52 * Noted at the time of Abilis Timer List corruption
53 * Orig Bug + Rejected solution : https://lkml.org/lkml/2013/3/29/67
54 * Reasoning : https://lkml.org/lkml/2013/4/8/15
55 *
56 ******************************************************************/
57
58 /*
59 * Save IRQ state and disable IRQs
60 */
arch_local_irq_save(void)61 static inline long arch_local_irq_save(void)
62 {
63 unsigned long temp, flags;
64
65 __asm__ __volatile__(
66 " lr %1, [status32] \n"
67 " bic %0, %1, %2 \n"
68 " and.f 0, %1, %2 \n"
69 " flag.nz %0 \n"
70 : "=r"(temp), "=r"(flags)
71 : "n"((STATUS_E1_MASK | STATUS_E2_MASK))
72 : "memory", "cc");
73
74 return flags;
75 }
76
77 /*
78 * restore saved IRQ state
79 */
arch_local_irq_restore(unsigned long flags)80 static inline void arch_local_irq_restore(unsigned long flags)
81 {
82
83 __asm__ __volatile__(
84 " flag %0 \n"
85 :
86 : "r"(flags)
87 : "memory");
88 }
89
90 /*
91 * Unconditionally Enable IRQs
92 */
arch_local_irq_enable(void)93 static inline void arch_local_irq_enable(void)
94 {
95 unsigned long temp;
96
97 __asm__ __volatile__(
98 " lr %0, [status32] \n"
99 " or %0, %0, %1 \n"
100 " flag %0 \n"
101 : "=&r"(temp)
102 : "n"((STATUS_E1_MASK | STATUS_E2_MASK))
103 : "cc", "memory");
104 }
105
106
107 /*
108 * Unconditionally Disable IRQs
109 */
arch_local_irq_disable(void)110 static inline void arch_local_irq_disable(void)
111 {
112 unsigned long temp;
113
114 __asm__ __volatile__(
115 " lr %0, [status32] \n"
116 " and %0, %0, %1 \n"
117 " flag %0 \n"
118 : "=&r"(temp)
119 : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK))
120 : "memory");
121 }
122
123 /*
124 * save IRQ state
125 */
arch_local_save_flags(void)126 static inline long arch_local_save_flags(void)
127 {
128 unsigned long temp;
129
130 __asm__ __volatile__(
131 " lr %0, [status32] \n"
132 : "=&r"(temp)
133 :
134 : "memory");
135
136 return temp;
137 }
138
139 /*
140 * Query IRQ state
141 */
arch_irqs_disabled_flags(unsigned long flags)142 static inline int arch_irqs_disabled_flags(unsigned long flags)
143 {
144 return !(flags & (STATUS_E1_MASK
145 #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
146 | STATUS_E2_MASK
147 #endif
148 ));
149 }
150
arch_irqs_disabled(void)151 static inline int arch_irqs_disabled(void)
152 {
153 return arch_irqs_disabled_flags(arch_local_save_flags());
154 }
155
156 #else
157
158 #ifdef CONFIG_TRACE_IRQFLAGS
159
160 .macro TRACE_ASM_IRQ_DISABLE
161 bl trace_hardirqs_off
162 .endm
163
164 .macro TRACE_ASM_IRQ_ENABLE
165 bl trace_hardirqs_on
166 .endm
167
168 #else
169
170 .macro TRACE_ASM_IRQ_DISABLE
171 .endm
172
173 .macro TRACE_ASM_IRQ_ENABLE
174 .endm
175
176 #endif
177
178 .macro IRQ_DISABLE scratch
179 lr \scratch, [status32]
180 bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
181 flag \scratch
182 TRACE_ASM_IRQ_DISABLE
183 .endm
184
185 .macro IRQ_ENABLE scratch
186 TRACE_ASM_IRQ_ENABLE
187 lr \scratch, [status32]
188 or \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK)
189 flag \scratch
190 .endm
191
192 #endif /* __ASSEMBLY__ */
193
194 #endif
195
