tools/brcm/K24/hndtools-mipsel-uclibc-4.2.4/include/linux/interrupt.h

   1 /* interrupt.h */
   2 #ifndef _LINUX_INTERRUPT_H
   3 #define _LINUX_INTERRUPT_H
   4
   5 #include <linux/config.h>
   6 #include <linux/kernel.h>
   7 #include <linux/smp.h>
   8 #include <linux/cache.h>
   9
  10 #include <asm/bitops.h>
  11 #include <asm/atomic.h>
  12 #include <asm/ptrace.h>
  13 #include <asm/system.h>
  14
  15 /* For 2.6.x compatibility */
  16 typedef void irqreturn_t;
  17 #define IRQ_NONE
  18 #define IRQ_HANDLED
  19 #define IRQ_RETVAL(x)
  20
  21 struct irqaction {
  22         void (*handler)(int, void *, struct pt_regs *);
  23         unsigned long flags;
  24         unsigned long mask;
  25         const char *name;
  26         void *dev_id;
  27         struct irqaction *next;
  28 };
  29
  30
  31 /* Who gets which entry in bh_base.  Things which will occur most often
  32    should come first */
  33
  34 enum {
  35         TIMER_BH = 0,
  36         TQUEUE_BH,
  37         DIGI_BH,
  38         SERIAL_BH,
  39         RISCOM8_BH,
  40         SPECIALIX_BH,
  41         AURORA_BH,
  42         ESP_BH,
  43         SCSI_BH,
  44         IMMEDIATE_BH,
  45         CYCLADES_BH,
  46         CM206_BH,
  47         JS_BH,
  48         MACSERIAL_BH,
  49         ISICOM_BH
  50 };
  51
  52 #include <asm/hardirq.h>
  53 #include <asm/softirq.h>
  54
  55
  56
  57 /* PLEASE, avoid to allocate new softirqs, if you need not _really_ high
  58    frequency threaded job scheduling. For almost all the purposes
  59    tasklets are more than enough. F.e. all serial device BHs et
  60    al. should be converted to tasklets, not to softirqs.
  61  */
  62
  63 enum
  64 {
  65         HI_SOFTIRQ=0,
  66         NET_TX_SOFTIRQ,
  67         NET_RX_SOFTIRQ,
  68         TASKLET_SOFTIRQ
  69 };
  70
  71 /* softirq mask and active fields moved to irq_cpustat_t in
  72  * asm/hardirq.h to get better cache usage.  KAO
  73  */
  74
  75 struct softirq_action
  76 {
  77         void    (*action)(struct softirq_action *);
  78         void    *data;
  79 };
  80
  81 asmlinkage void do_softirq(void);
  82 extern void open_softirq(int nr, void (*action)(struct softirq_action*), void *data);
  83 extern void softirq_init(void);
  84 #define __cpu_raise_softirq(cpu, nr) do { softirq_pending(cpu) |= 1UL << (nr); } while (0)
  85 extern void FASTCALL(cpu_raise_softirq(unsigned int cpu, unsigned int nr));
  86 extern void FASTCALL(raise_softirq(unsigned int nr));
  87
  88
  89
  90 /* Tasklets --- multithreaded analogue of BHs.
  91
  92    Main feature differing them of generic softirqs: tasklet
  93    is running only on one CPU simultaneously.
  94
  95    Main feature differing them of BHs: different tasklets
  96    may be run simultaneously on different CPUs.
  97
  98    Properties:
  99    * If tasklet_schedule() is called, then tasklet is guaranteed
 100      to be executed on some cpu at least once after this.
 101    * If the tasklet is already scheduled, but its excecution is still not
 102      started, it will be executed only once.
 103    * If this tasklet is already running on another CPU (or schedule is called
 104      from tasklet itself), it is rescheduled for later.
 105    * Tasklet is strictly serialized wrt itself, but not
 106      wrt another tasklets. If client needs some intertask synchronization,
 107      he makes it with spinlocks.
 108  */
 109
 110 struct tasklet_struct
 111 {
 112         struct tasklet_struct *next;
 113         unsigned long state;
 114         atomic_t count;
 115         void (*func)(unsigned long);
 116         unsigned long data;
 117 };
 118
 119 #define DECLARE_TASKLET(name, func, data) \
 120 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
 121
 122 #define DECLARE_TASKLET_DISABLED(name, func, data) \
 123 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
 124
 125
 126 enum
 127 {
 128         TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
 129         TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
 130 };
 131
 132 struct tasklet_head
 133 {
 134         struct tasklet_struct *list;
 135 } __attribute__ ((__aligned__(SMP_CACHE_BYTES)));
 136
 137 extern struct tasklet_head tasklet_vec[NR_CPUS];
 138 extern struct tasklet_head tasklet_hi_vec[NR_CPUS];
 139
 140 #ifdef CONFIG_SMP
 141 static inline int tasklet_trylock(struct tasklet_struct *t)
 142 {
 143         return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
 144 }
 145
 146 static inline void tasklet_unlock(struct tasklet_struct *t)
 147 {
 148         smp_mb__before_clear_bit();
 149         clear_bit(TASKLET_STATE_RUN, &(t)->state);
 150 }
 151
 152 static inline void tasklet_unlock_wait(struct tasklet_struct *t)
 153 {
 154         while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
 155 }
 156 #else
 157 #define tasklet_trylock(t) 1
 158 #define tasklet_unlock_wait(t) do { } while (0)
 159 #define tasklet_unlock(t) do { } while (0)
 160 #endif
 161
 162 extern void FASTCALL(__tasklet_schedule(struct tasklet_struct *t));
 163
 164 static inline void tasklet_schedule(struct tasklet_struct *t)
 165 {
 166         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 167                 __tasklet_schedule(t);
 168 }
 169
 170 extern void FASTCALL(__tasklet_hi_schedule(struct tasklet_struct *t));
 171
 172 static inline void tasklet_hi_schedule(struct tasklet_struct *t)
 173 {
 174         if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
 175                 __tasklet_hi_schedule(t);
 176 }
 177
 178
 179 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
 180 {
 181         atomic_inc(&t->count);
 182         smp_mb__after_atomic_inc();
 183 }
 184
 185 static inline void tasklet_disable(struct tasklet_struct *t)
 186 {
 187         tasklet_disable_nosync(t);
 188         tasklet_unlock_wait(t);
 189         smp_mb();
 190 }
 191
 192 static inline void tasklet_enable(struct tasklet_struct *t)
 193 {
 194         smp_mb__before_atomic_dec();
 195         atomic_dec(&t->count);
 196 }
 197
 198 static inline void tasklet_hi_enable(struct tasklet_struct *t)
 199 {
 200         smp_mb__before_atomic_dec();
 201         atomic_dec(&t->count);
 202 }
 203
 204 extern void tasklet_kill(struct tasklet_struct *t);
 205 extern void tasklet_init(struct tasklet_struct *t,
 206                          void (*func)(unsigned long), unsigned long data);
 207
 208 #ifdef CONFIG_SMP
 209
 210 #define SMP_TIMER_NAME(name) name##__thr
 211
 212 #define SMP_TIMER_DEFINE(name, task) \
 213 DECLARE_TASKLET(task, name##__thr, 0); \
 214 static void name (unsigned long dummy) \
 215 { \
 216         tasklet_schedule(&(task)); \
 217 }
 218
 219 #else /* CONFIG_SMP */
 220
 221 #define SMP_TIMER_NAME(name) name
 222 #define SMP_TIMER_DEFINE(name, task)
 223
 224 #endif /* CONFIG_SMP */
 225
 226
 227 /* Old BH definitions */
 228
 229 extern struct tasklet_struct bh_task_vec[];
 230
 231 /* It is exported _ONLY_ for wait_on_irq(). */
 232 extern spinlock_t global_bh_lock;
 233
 234 static inline void mark_bh(int nr)
 235 {
 236         tasklet_hi_schedule(bh_task_vec+nr);
 237 }
 238
 239 extern void init_bh(int nr, void (*routine)(void));
 240 extern void remove_bh(int nr);
 241
 242
 243 /*
 244  * Autoprobing for irqs:
 245  *
 246  * probe_irq_on() and probe_irq_off() provide robust primitives
 247  * for accurate IRQ probing during kernel initialization.  They are
 248  * reasonably simple to use, are not "fooled" by spurious interrupts,
 249  * and, unlike other attempts at IRQ probing, they do not get hung on
 250  * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
 251  *
 252  * For reasonably foolproof probing, use them as follows:
 253  *
 254  * 1. clear and/or mask the device's internal interrupt.
 255  * 2. sti();
 256  * 3. irqs = probe_irq_on();      // "take over" all unassigned idle IRQs
 257  * 4. enable the device and cause it to trigger an interrupt.
 258  * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
 259  * 6. irq = probe_irq_off(irqs);  // get IRQ number, 0=none, negative=multiple
 260  * 7. service the device to clear its pending interrupt.
 261  * 8. loop again if paranoia is required.
 262  *
 263  * probe_irq_on() returns a mask of allocated irq's.
 264  *
 265  * probe_irq_off() takes the mask as a parameter,
 266  * and returns the irq number which occurred,
 267  * or zero if none occurred, or a negative irq number
 268  * if more than one irq occurred.
 269  */
 270 extern unsigned long probe_irq_on(void);        /* returns 0 on failure */
 271 extern int probe_irq_off(unsigned long);        /* returns 0 or negative on failure */
 272 extern unsigned int probe_irq_mask(unsigned long);      /* returns mask of ISA interrupts */
 273
 274 #endif