summaryrefslogtreecommitdiffstats
path: root/arch/blackfin/include/asm/irqflags.h
blob: 43eb4749de3d97ad2e6fb23d3fc11edd62afdad0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
/*
 * interface to Blackfin CEC
 *
 * Copyright 2009 Analog Devices Inc.
 * Licensed under the GPL-2 or later.
 */

#ifndef __ASM_BFIN_IRQFLAGS_H__
#define __ASM_BFIN_IRQFLAGS_H__

#include <mach/blackfin.h>

#ifdef CONFIG_SMP
# include <asm/pda.h>
# include <asm/processor.h>
# define bfin_irq_flags cpu_pda[blackfin_core_id()].imask
#else
extern unsigned long bfin_irq_flags;
#endif

static inline notrace void bfin_sti(unsigned long flags)
{
	asm volatile("sti %0;" : : "d" (flags));
}

static inline notrace unsigned long bfin_cli(void)
{
	unsigned long flags;
	asm volatile("cli %0;" : "=d" (flags));
	return flags;
}

#ifdef CONFIG_DEBUG_HWERR
# define bfin_no_irqs 0x3f
#else
# define bfin_no_irqs 0x1f
#endif

/*****************************************************************************/
/*
 * Hard, untraced CPU interrupt flag manipulation and access.
 */
static inline notrace void __hard_local_irq_disable(void)
{
	bfin_cli();
}

static inline notrace void __hard_local_irq_enable(void)
{
	bfin_sti(bfin_irq_flags);
}

static inline notrace unsigned long hard_local_save_flags(void)
{
	return bfin_read_IMASK();
}

static inline notrace unsigned long __hard_local_irq_save(void)
{
	unsigned long flags;
	flags = bfin_cli();
#ifdef CONFIG_DEBUG_HWERR
	bfin_sti(0x3f);
#endif
	return flags;
}

static inline notrace int hard_irqs_disabled_flags(unsigned long flags)
{
	return (flags & ~0x3f) == 0;
}

static inline notrace int hard_irqs_disabled(void)
{
	unsigned long flags = hard_local_save_flags();
	return hard_irqs_disabled_flags(flags);
}

static inline notrace void __hard_local_irq_restore(unsigned long flags)
{
	if (!hard_irqs_disabled_flags(flags))
		__hard_local_irq_enable();
}

/*****************************************************************************/
/*
 * Interrupt pipe handling.
 */
#ifdef CONFIG_IPIPE

#include <linux/compiler.h>
#include <linux/ipipe_trace.h>
/*
 * Way too many inter-deps between low-level headers in this port, so
 * we redeclare the required bits we cannot pick from
 * <asm/ipipe_base.h> to prevent circular dependencies.
 */
void __ipipe_stall_root(void);
void __ipipe_unstall_root(void);
unsigned long __ipipe_test_root(void);
unsigned long __ipipe_test_and_stall_root(void);
void __ipipe_restore_root(unsigned long flags);

#ifdef CONFIG_IPIPE_DEBUG_CONTEXT
struct ipipe_domain;
extern struct ipipe_domain ipipe_root;
void ipipe_check_context(struct ipipe_domain *ipd);
#define __check_irqop_context(ipd)  ipipe_check_context(&ipipe_root)
#else /* !CONFIG_IPIPE_DEBUG_CONTEXT */
#define __check_irqop_context(ipd)  do { } while (0)
#endif /* !CONFIG_IPIPE_DEBUG_CONTEXT */

/*
 * Interrupt pipe interface to linux/irqflags.h.
 */
static inline notrace void arch_local_irq_disable(void)
{
	__check_irqop_context();
	__ipipe_stall_root();
	barrier();
}

static inline notrace void arch_local_irq_enable(void)
{
	barrier();
	__check_irqop_context();
	__ipipe_unstall_root();
}

static inline notrace unsigned long arch_local_save_flags(void)
{
	return __ipipe_test_root() ? bfin_no_irqs : bfin_irq_flags;
}

static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
{
	return flags == bfin_no_irqs;
}

static inline notrace unsigned long arch_local_irq_save(void)
{
	unsigned long flags;

	__check_irqop_context();
	flags = __ipipe_test_and_stall_root() ? bfin_no_irqs : bfin_irq_flags;
	barrier();

	return flags;
}

static inline notrace void arch_local_irq_restore(unsigned long flags)
{
	__check_irqop_context();
	__ipipe_restore_root(flags == bfin_no_irqs);
}

static inline notrace unsigned long arch_mangle_irq_bits(int virt, unsigned long real)
{
	/*
	 * Merge virtual and real interrupt mask bits into a single
	 * 32bit word.
	 */
	return (real & ~(1 << 31)) | ((virt != 0) << 31);
}

static inline notrace int arch_demangle_irq_bits(unsigned long *x)
{
	int virt = (*x & (1 << 31)) != 0;
	*x &= ~(1L << 31);
	return virt;
}

/*
 * Interface to various arch routines that may be traced.
 */
#ifdef CONFIG_IPIPE_TRACE_IRQSOFF
static inline notrace void hard_local_irq_disable(void)
{
	if (!hard_irqs_disabled()) {
		__hard_local_irq_disable();
		ipipe_trace_begin(0x80000000);
	}
}

static inline notrace void hard_local_irq_enable(void)
{
	if (hard_irqs_disabled()) {
		ipipe_trace_end(0x80000000);
		__hard_local_irq_enable();
	}
}

static inline notrace unsigned long hard_local_irq_save(void)
{
	unsigned long flags = hard_local_save_flags();
	if (!hard_irqs_disabled_flags(flags)) {
		__hard_local_irq_disable();
		ipipe_trace_begin(0x80000001);
	}
	return flags;
}

static inline notrace void hard_local_irq_restore(unsigned long flags)
{
	if (!hard_irqs_disabled_flags(flags)) {
		ipipe_trace_end(0x80000001);
		__hard_local_irq_enable();
	}
}

#else /* !CONFIG_IPIPE_TRACE_IRQSOFF */
# define hard_local_irq_disable()	__hard_local_irq_disable()
# define hard_local_irq_enable()	__hard_local_irq_enable()
# define hard_local_irq_save()		__hard_local_irq_save()
# define hard_local_irq_restore(flags)	__hard_local_irq_restore(flags)
#endif /* !CONFIG_IPIPE_TRACE_IRQSOFF */

#define hard_local_irq_save_cond()		hard_local_irq_save()
#define hard_local_irq_restore_cond(flags)	hard_local_irq_restore(flags)

#else /* !CONFIG_IPIPE */

/*
 * Direct interface to linux/irqflags.h.
 */
#define arch_local_save_flags()		hard_local_save_flags()
#define arch_local_irq_save(flags)	__hard_local_irq_save()
#define arch_local_irq_restore(flags)	__hard_local_irq_restore(flags)
#define arch_local_irq_enable()		__hard_local_irq_enable()
#define arch_local_irq_disable()	__hard_local_irq_disable()
#define arch_irqs_disabled_flags(flags)	hard_irqs_disabled_flags(flags)
#define arch_irqs_disabled()		hard_irqs_disabled()

/*
 * Interface to various arch routines that may be traced.
 */
#define hard_local_irq_save()		__hard_local_irq_save()
#define hard_local_irq_restore(flags)	__hard_local_irq_restore(flags)
#define hard_local_irq_enable()		__hard_local_irq_enable()
#define hard_local_irq_disable()	__hard_local_irq_disable()
#define hard_local_irq_save_cond()		hard_local_save_flags()
#define hard_local_irq_restore_cond(flags)	do { (void)(flags); } while (0)

#endif /* !CONFIG_IPIPE */

#ifdef CONFIG_SMP
#define hard_local_irq_save_smp()		hard_local_irq_save()
#define hard_local_irq_restore_smp(flags)	hard_local_irq_restore(flags)
#else
#define hard_local_irq_save_smp()		hard_local_save_flags()
#define hard_local_irq_restore_smp(flags)	do { (void)(flags); } while (0)
#endif

/*
 * Remap the arch-neutral IRQ state manipulation macros to the
 * blackfin-specific hard_local_irq_* API.
 */
#define local_irq_save_hw(flags)			\
	do {						\
		(flags) = hard_local_irq_save();	\
	} while (0)
#define local_irq_restore_hw(flags)		\
	do {					\
		hard_local_irq_restore(flags);	\
	} while (0)
#define local_irq_disable_hw()			\
	do {					\
		hard_local_irq_disable();	\
	} while (0)
#define local_irq_enable_hw()			\
	do {					\
		hard_local_irq_enable();	\
	} while (0)
#define local_irq_save_hw_notrace(flags)		\
	do {						\
		(flags) = __hard_local_irq_save();	\
	} while (0)
#define local_irq_restore_hw_notrace(flags)		\
	do {						\
		__hard_local_irq_restore(flags);	\
	} while (0)

#define irqs_disabled_hw()	hard_irqs_disabled()

#endif