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