1 /* MN10300 IRQ flag handling
2 *
3 * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12 #ifndef _ASM_IRQFLAGS_H
13 #define _ASM_IRQFLAGS_H
14
15 #include <asm/cpu-regs.h>
16 #ifndef __ASSEMBLY__
17 #include <linux/smp.h>
18 #endif
19
20 /*
21 * interrupt control
22 * - "disabled": run in IM1/2
23 * - level 0 - kernel debugger
24 * - level 1 - virtual serial DMA (if present)
25 * - level 5 - normal interrupt priority
26 * - level 6 - timer interrupt
27 * - "enabled": run in IM7
28 */
29 #define MN10300_CLI_LEVEL (CONFIG_LINUX_CLI_LEVEL << EPSW_IM_SHIFT)
30
31 #ifndef __ASSEMBLY__
32
arch_local_save_flags(void)33 static inline unsigned long arch_local_save_flags(void)
34 {
35 unsigned long flags;
36
37 asm volatile("mov epsw,%0" : "=d"(flags));
38 return flags;
39 }
40
arch_local_irq_disable(void)41 static inline void arch_local_irq_disable(void)
42 {
43 asm volatile(
44 " and %0,epsw \n"
45 " or %1,epsw \n"
46 " nop \n"
47 " nop \n"
48 " nop \n"
49 :
50 : "i"(~EPSW_IM), "i"(EPSW_IE | MN10300_CLI_LEVEL)
51 : "memory");
52 }
53
arch_local_irq_save(void)54 static inline unsigned long arch_local_irq_save(void)
55 {
56 unsigned long flags;
57
58 flags = arch_local_save_flags();
59 arch_local_irq_disable();
60 return flags;
61 }
62
63 /*
64 * we make sure arch_irq_enable() doesn't cause priority inversion
65 */
66 extern unsigned long __mn10300_irq_enabled_epsw[];
67
arch_local_irq_enable(void)68 static inline void arch_local_irq_enable(void)
69 {
70 unsigned long tmp;
71 int cpu = raw_smp_processor_id();
72
73 asm volatile(
74 " mov epsw,%0 \n"
75 " and %1,%0 \n"
76 " or %2,%0 \n"
77 " mov %0,epsw \n"
78 : "=&d"(tmp)
79 : "i"(~EPSW_IM), "r"(__mn10300_irq_enabled_epsw[cpu])
80 : "memory", "cc");
81 }
82
arch_local_irq_restore(unsigned long flags)83 static inline void arch_local_irq_restore(unsigned long flags)
84 {
85 asm volatile(
86 " mov %0,epsw \n"
87 " nop \n"
88 " nop \n"
89 " nop \n"
90 :
91 : "d"(flags)
92 : "memory", "cc");
93 }
94
arch_irqs_disabled_flags(unsigned long flags)95 static inline bool arch_irqs_disabled_flags(unsigned long flags)
96 {
97 return (flags & (EPSW_IE | EPSW_IM)) != (EPSW_IE | EPSW_IM_7);
98 }
99
arch_irqs_disabled(void)100 static inline bool arch_irqs_disabled(void)
101 {
102 return arch_irqs_disabled_flags(arch_local_save_flags());
103 }
104
105 /*
106 * Hook to save power by halting the CPU
107 * - called from the idle loop
108 * - must reenable interrupts (which takes three instruction cycles to complete)
109 */
arch_safe_halt(void)110 static inline void arch_safe_halt(void)
111 {
112 #ifdef CONFIG_SMP
113 arch_local_irq_enable();
114 #else
115 asm volatile(
116 " or %0,epsw \n"
117 " nop \n"
118 " nop \n"
119 " bset %2,(%1) \n"
120 :
121 : "i"(EPSW_IE|EPSW_IM), "n"(&CPUM), "i"(CPUM_SLEEP)
122 : "cc");
123 #endif
124 }
125
126 #define __sleep_cpu() \
127 do { \
128 asm volatile( \
129 " bset %1,(%0)\n" \
130 "1: btst %1,(%0)\n" \
131 " bne 1b\n" \
132 : \
133 : "i"(&CPUM), "i"(CPUM_SLEEP) \
134 : "cc" \
135 ); \
136 } while (0)
137
arch_local_cli(void)138 static inline void arch_local_cli(void)
139 {
140 asm volatile(
141 " and %0,epsw \n"
142 " nop \n"
143 " nop \n"
144 " nop \n"
145 :
146 : "i"(~EPSW_IE)
147 : "memory"
148 );
149 }
150
arch_local_cli_save(void)151 static inline unsigned long arch_local_cli_save(void)
152 {
153 unsigned long flags = arch_local_save_flags();
154 arch_local_cli();
155 return flags;
156 }
157
arch_local_sti(void)158 static inline void arch_local_sti(void)
159 {
160 asm volatile(
161 " or %0,epsw \n"
162 :
163 : "i"(EPSW_IE)
164 : "memory");
165 }
166
arch_local_change_intr_mask_level(unsigned long level)167 static inline void arch_local_change_intr_mask_level(unsigned long level)
168 {
169 asm volatile(
170 " and %0,epsw \n"
171 " or %1,epsw \n"
172 :
173 : "i"(~EPSW_IM), "i"(EPSW_IE | level)
174 : "cc", "memory");
175 }
176
177 #else /* !__ASSEMBLY__ */
178
179 #define LOCAL_SAVE_FLAGS(reg) \
180 mov epsw,reg
181
182 #define LOCAL_IRQ_DISABLE \
183 and ~EPSW_IM,epsw; \
184 or EPSW_IE|MN10300_CLI_LEVEL,epsw; \
185 nop; \
186 nop; \
187 nop
188
189 #define LOCAL_IRQ_ENABLE \
190 or EPSW_IE|EPSW_IM_7,epsw
191
192 #define LOCAL_IRQ_RESTORE(reg) \
193 mov reg,epsw
194
195 #define LOCAL_CLI_SAVE(reg) \
196 mov epsw,reg; \
197 and ~EPSW_IE,epsw; \
198 nop; \
199 nop; \
200 nop
201
202 #define LOCAL_CLI \
203 and ~EPSW_IE,epsw; \
204 nop; \
205 nop; \
206 nop
207
208 #define LOCAL_STI \
209 or EPSW_IE,epsw
210
211 #define LOCAL_CHANGE_INTR_MASK_LEVEL(level) \
212 and ~EPSW_IM,epsw; \
213 or EPSW_IE|(level),epsw
214
215 #endif /* __ASSEMBLY__ */
216 #endif /* _ASM_IRQFLAGS_H */
217