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Viewing changes to arch/mn10300/include/asm/irqflags.h

  • Committer: Bazaar Package Importer
  • Author(s): Ben Hutchings, Ben Hutchings, Aurelien Jarno, Martin Michlmayr
  • Date: 2011-04-06 13:53:30 UTC
  • mfrom: (43.1.5 sid)
  • Revision ID: james.westby@ubuntu.com-20110406135330-wjufxhd0tvn3zx4z
Tags: 2.6.38-3
http://bugs.debian.org/620124
http://bugs.debian.org/620284
http://bugs.debian.org/620204
[ Ben Hutchings ]
* [ppc64] Add to linux-tools package architectures (Closes: #620124)
* [amd64] Save cr4 to mmu_cr4_features at boot time (Closes: #620284)
* appletalk: Fix bugs introduced when removing use of BKL
* ALSA: Fix yet another race in disconnection
* cciss: Fix lost command issue
* ath9k: Fix kernel panic in AR2427
* ses: Avoid kernel panic when lun 0 is not mapped
* PCI/ACPI: Report ASPM support to BIOS if not disabled from command line

[ Aurelien Jarno ]
* rtlwifi: fix build when PCI is not enabled.

[ Martin Michlmayr ]
* rtlwifi: Eliminate udelay calls with too large values (Closes: #620204)

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arch/mn10300/include/asm/irqflags.h
 
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 - GDB stub
 
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
 
 
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
 
 
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
 
 
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
 
 
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
 
 
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
 
 
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
 
 
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
 */
 
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
 
 
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
 
 
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
 
 
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
 
 
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 */