kernel/generic/include/ddi/irq.h

   1 /*
   2  * Copyright (c) 2006 Jakub Jermar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup genericddi
  30  * @{
  31  */
  32 /** @file
  33  */
  34
  35 #ifndef KERN_IRQ_H_
  36 #define KERN_IRQ_H_
  37
  38 typedef enum {
  39         CMD_MEM_READ_1 = 0,
  40         CMD_MEM_READ_2,
  41         CMD_MEM_READ_4,
  42         CMD_MEM_READ_8,
  43         CMD_MEM_WRITE_1,
  44         CMD_MEM_WRITE_2,
  45         CMD_MEM_WRITE_4,
  46         CMD_MEM_WRITE_8,
  47         CMD_PORT_READ_1,
  48         CMD_PORT_WRITE_1,
  49         CMD_IA64_GETCHAR,
  50         CMD_PPC32_GETCHAR,
  51         CMD_LAST
  52 } irq_cmd_type;
  53
  54 typedef struct {
  55         irq_cmd_type cmd;
  56         void *addr;
  57         unsigned long long value;
  58         int dstarg;
  59 } irq_cmd_t;
  60
  61 typedef struct {
  62         unsigned int cmdcount;
  63         irq_cmd_t *cmds;
  64 } irq_code_t;
  65
  66 #ifdef KERNEL
  67
  68 #include <arch/types.h>
  69 #include <adt/list.h>
  70 #include <synch/spinlock.h>
  71 #include <proc/task.h>
  72
  73 typedef enum {
  74         IRQ_DECLINE,            /**< Decline to service. */
  75         IRQ_ACCEPT              /**< Accept to service. */
  76 } irq_ownership_t;
  77
  78 typedef enum {
  79         IRQ_TRIGGER_LEVEL = 1,
  80         IRQ_TRIGGER_EDGE
  81 } irq_trigger_t;
  82
  83 struct irq;
  84 typedef void (* irq_handler_t)(struct irq *irq, void *arg, ...);
  85
  86
  87
  88 /** IPC notification config structure.
  89  *
  90  * Primarily, this structure is encapsulated in the irq_t structure.
  91  * It is protected by irq_t::lock.
  92  */
  93 typedef struct {
  94         /** When false, notifications are not sent. */
  95         bool notify;
  96         /** Answerbox for notifications. */
  97         answerbox_t *answerbox;
  98         /** Method to be used for the notification. */
  99         unative_t method;
 100         /** Top-half pseudocode. */
 101         irq_code_t *code;
 102         /** Counter. */
 103         count_t counter;
 104         /**
 105          * Link between IRQs that are notifying the same answerbox. The list is
 106          * protected by the answerbox irq_lock.
 107          */
 108         link_t link;
 109 } ipc_notif_cfg_t;
 110
 111 /** Structure representing one device IRQ.
 112  *
 113  * If one device has multiple interrupts, there will be multiple irq_t
 114  * instantions with the same devno.
 115  */
 116 typedef struct irq {
 117         /** Hash table link. */
 118         link_t link;
 119
 120         /** Lock protecting everything in this structure
 121          *  except the link member. When both the IRQ
 122          *  hash table lock and this lock are to be acquired,
 123          *  this lock must not be taken first.
 124          */
 125         SPINLOCK_DECLARE(lock);
 126
 127         /** Unique device number. -1 if not yet assigned. */
 128         devno_t devno;
 129
 130         /** Actual IRQ number. -1 if not yet assigned. */
 131         inr_t inr;
 132         /** Trigger level of the IRQ.*/
 133         irq_trigger_t trigger;
 134         /** Claim ownership of the IRQ. */
 135         irq_ownership_t (* claim)(void);
 136         /** Handler for this IRQ and device. */
 137         irq_handler_t handler;
 138         /** Argument for the handler. */
 139         void *arg;
 140
 141         /** Notification configuration structure. */
 142         ipc_notif_cfg_t notif_cfg;
 143 } irq_t;
 144
 145 extern void irq_init(count_t inrs, count_t chains);
 146 extern void irq_initialize(irq_t *irq);
 147 extern void irq_register(irq_t *irq);
 148 extern irq_t *irq_dispatch_and_lock(inr_t inr);
 149 extern irq_t *irq_find_and_lock(inr_t inr, devno_t devno);
 150
 151 #endif
 152
 153 #endif
 154
 155 /** @}
 156  */