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[karo-tx-linux.git] / kernel / irq / internals.h
1 /*
2  * IRQ subsystem internal functions and variables:
3  *
4  * Do not ever include this file from anything else than
5  * kernel/irq/. Do not even think about using any information outside
6  * of this file for your non core code.
7  */
8 #include <linux/irqdesc.h>
9 #include <linux/kernel_stat.h>
10
11 #ifdef CONFIG_SPARSE_IRQ
12 # define IRQ_BITMAP_BITS        (NR_IRQS + 8196)
13 #else
14 # define IRQ_BITMAP_BITS        NR_IRQS
15 #endif
16
17 #define istate core_internal_state__do_not_mess_with_it
18
19 extern bool noirqdebug;
20
21 /*
22  * Bits used by threaded handlers:
23  * IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
24  * IRQTF_WARNED    - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
25  * IRQTF_AFFINITY  - irq thread is requested to adjust affinity
26  * IRQTF_FORCED_THREAD  - irq action is force threaded
27  */
28 enum {
29         IRQTF_RUNTHREAD,
30         IRQTF_WARNED,
31         IRQTF_AFFINITY,
32         IRQTF_FORCED_THREAD,
33 };
34
35 /*
36  * Bit masks for desc->core_internal_state__do_not_mess_with_it
37  *
38  * IRQS_AUTODETECT              - autodetection in progress
39  * IRQS_SPURIOUS_DISABLED       - was disabled due to spurious interrupt
40  *                                detection
41  * IRQS_POLL_INPROGRESS         - polling in progress
42  * IRQS_ONESHOT                 - irq is not unmasked in primary handler
43  * IRQS_REPLAY                  - irq is replayed
44  * IRQS_WAITING                 - irq is waiting
45  * IRQS_PENDING                 - irq is pending and replayed later
46  * IRQS_SUSPENDED               - irq is suspended
47  */
48 enum {
49         IRQS_AUTODETECT         = 0x00000001,
50         IRQS_SPURIOUS_DISABLED  = 0x00000002,
51         IRQS_POLL_INPROGRESS    = 0x00000008,
52         IRQS_ONESHOT            = 0x00000020,
53         IRQS_REPLAY             = 0x00000040,
54         IRQS_WAITING            = 0x00000080,
55         IRQS_PENDING            = 0x00000200,
56         IRQS_SUSPENDED          = 0x00000800,
57 };
58
59 #include "debug.h"
60 #include "settings.h"
61
62 extern int __irq_set_trigger(struct irq_desc *desc, unsigned long flags);
63 extern void __disable_irq(struct irq_desc *desc);
64 extern void __enable_irq(struct irq_desc *desc);
65
66 extern int irq_startup(struct irq_desc *desc, bool resend);
67 extern void irq_shutdown(struct irq_desc *desc);
68 extern void irq_enable(struct irq_desc *desc);
69 extern void irq_disable(struct irq_desc *desc);
70 extern void irq_percpu_enable(struct irq_desc *desc, unsigned int cpu);
71 extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu);
72 extern void mask_irq(struct irq_desc *desc);
73 extern void unmask_irq(struct irq_desc *desc);
74 extern void unmask_threaded_irq(struct irq_desc *desc);
75
76 #ifdef CONFIG_SPARSE_IRQ
77 static inline void irq_mark_irq(unsigned int irq) { }
78 #else
79 extern void irq_mark_irq(unsigned int irq);
80 #endif
81
82 extern void init_kstat_irqs(struct irq_desc *desc, int node, int nr);
83
84 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action);
85 irqreturn_t handle_irq_event(struct irq_desc *desc);
86
87 /* Resending of interrupts :*/
88 void check_irq_resend(struct irq_desc *desc);
89 bool irq_wait_for_poll(struct irq_desc *desc);
90 void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
91
92 #ifdef CONFIG_PROC_FS
93 extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
94 extern void unregister_irq_proc(unsigned int irq, struct irq_desc *desc);
95 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
96 extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
97 #else
98 static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
99 static inline void unregister_irq_proc(unsigned int irq, struct irq_desc *desc) { }
100 static inline void register_handler_proc(unsigned int irq,
101                                          struct irqaction *action) { }
102 static inline void unregister_handler_proc(unsigned int irq,
103                                            struct irqaction *action) { }
104 #endif
105
106 extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
107
108 extern void irq_set_thread_affinity(struct irq_desc *desc);
109
110 extern int irq_do_set_affinity(struct irq_data *data,
111                                const struct cpumask *dest, bool force);
112
113 /* Inline functions for support of irq chips on slow busses */
114 static inline void chip_bus_lock(struct irq_desc *desc)
115 {
116         if (unlikely(desc->irq_data.chip->irq_bus_lock))
117                 desc->irq_data.chip->irq_bus_lock(&desc->irq_data);
118 }
119
120 static inline void chip_bus_sync_unlock(struct irq_desc *desc)
121 {
122         if (unlikely(desc->irq_data.chip->irq_bus_sync_unlock))
123                 desc->irq_data.chip->irq_bus_sync_unlock(&desc->irq_data);
124 }
125
126 #define _IRQ_DESC_CHECK         (1 << 0)
127 #define _IRQ_DESC_PERCPU        (1 << 1)
128
129 #define IRQ_GET_DESC_CHECK_GLOBAL       (_IRQ_DESC_CHECK)
130 #define IRQ_GET_DESC_CHECK_PERCPU       (_IRQ_DESC_CHECK | _IRQ_DESC_PERCPU)
131
132 struct irq_desc *
133 __irq_get_desc_lock(unsigned int irq, unsigned long *flags, bool bus,
134                     unsigned int check);
135 void __irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags, bool bus);
136
137 static inline struct irq_desc *
138 irq_get_desc_buslock(unsigned int irq, unsigned long *flags, unsigned int check)
139 {
140         return __irq_get_desc_lock(irq, flags, true, check);
141 }
142
143 static inline void
144 irq_put_desc_busunlock(struct irq_desc *desc, unsigned long flags)
145 {
146         __irq_put_desc_unlock(desc, flags, true);
147 }
148
149 static inline struct irq_desc *
150 irq_get_desc_lock(unsigned int irq, unsigned long *flags, unsigned int check)
151 {
152         return __irq_get_desc_lock(irq, flags, false, check);
153 }
154
155 static inline void
156 irq_put_desc_unlock(struct irq_desc *desc, unsigned long flags)
157 {
158         __irq_put_desc_unlock(desc, flags, false);
159 }
160
161 /*
162  * Manipulation functions for irq_data.state
163  */
164 static inline void irqd_set_move_pending(struct irq_data *d)
165 {
166         __irqd_to_state(d) |= IRQD_SETAFFINITY_PENDING;
167 }
168
169 static inline void irqd_clr_move_pending(struct irq_data *d)
170 {
171         __irqd_to_state(d) &= ~IRQD_SETAFFINITY_PENDING;
172 }
173
174 static inline void irqd_clear(struct irq_data *d, unsigned int mask)
175 {
176         __irqd_to_state(d) &= ~mask;
177 }
178
179 static inline void irqd_set(struct irq_data *d, unsigned int mask)
180 {
181         __irqd_to_state(d) |= mask;
182 }
183
184 static inline bool irqd_has_set(struct irq_data *d, unsigned int mask)
185 {
186         return __irqd_to_state(d) & mask;
187 }
188
189 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
190 {
191         __this_cpu_inc(*desc->kstat_irqs);
192         __this_cpu_inc(kstat.irqs_sum);
193 }
194
195 static inline int irq_desc_get_node(struct irq_desc *desc)
196 {
197         return irq_data_get_node(&desc->irq_data);
198 }
199
200 #ifdef CONFIG_PM_SLEEP
201 bool irq_pm_check_wakeup(struct irq_desc *desc);
202 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
203 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
204 #else
205 static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
206 static inline void
207 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
208 static inline void
209 irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { }
210 #endif