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  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_PIO_READ_8 = 1,
  40.     CMD_PIO_READ_16,
  41.     CMD_PIO_READ_32,
  42.     CMD_PIO_WRITE_8,
  43.     CMD_PIO_WRITE_16,
  44.     CMD_PIO_WRITE_32,
  45.     CMD_BTEST,
  46.     CMD_PREDICATE,
  47.     CMD_ACCEPT,
  48.     CMD_DECLINE,
  49.     CMD_LAST
  50. } irq_cmd_type;
  51.  
  52. typedef struct {
  53.     irq_cmd_type cmd;
  54.     void *addr;
  55.     unsigned long long value;
  56.     unsigned int srcarg;
  57.     unsigned int dstarg;
  58. } irq_cmd_t;
  59.  
  60. typedef struct {
  61.     unsigned int cmdcount;
  62.     irq_cmd_t *cmds;
  63. } irq_code_t;
  64.  
  65. #ifdef KERNEL
  66.  
  67. #include <arch/types.h>
  68. #include <adt/list.h>
  69. #include <adt/hash_table.h>
  70. #include <synch/spinlock.h>
  71. #include <proc/task.h>
  72. #include <ipc/ipc.h>
  73.  
  74. typedef enum {
  75.     IRQ_DECLINE,        /**< Decline to service. */
  76.     IRQ_ACCEPT      /**< Accept to service. */
  77. } irq_ownership_t;
  78.  
  79. typedef enum {
  80.     IRQ_TRIGGER_LEVEL = 1,
  81.     IRQ_TRIGGER_EDGE
  82. } irq_trigger_t;
  83.  
  84. struct irq;
  85. typedef void (* irq_handler_t)(struct irq *);
  86.  
  87. /** Type for function used to clear the interrupt. */
  88. typedef void (* cir_t)(void *, inr_t);
  89.  
  90. /** IPC notification config structure.
  91.  *
  92.  * Primarily, this structure is encapsulated in the irq_t structure.
  93.  * It is protected by irq_t::lock.
  94.  */
  95. typedef struct {
  96.     /** When false, notifications are not sent. */
  97.     bool notify;
  98.     /** Answerbox for notifications. */
  99.     answerbox_t *answerbox;
  100.     /** Method to be used for the notification. */
  101.     unative_t method;
  102.     /** Arguments that will be sent if the IRQ is claimed. */
  103.     unative_t scratch[IPC_CALL_LEN];
  104.     /** Top-half pseudocode. */
  105.     irq_code_t *code;
  106.     /** Counter. */
  107.     size_t counter;
  108.     /**
  109.      * Link between IRQs that are notifying the same answerbox. The list is
  110.      * protected by the answerbox irq_lock.
  111.      */
  112.     link_t link;
  113. } ipc_notif_cfg_t;
  114.  
  115. /** Structure representing one device IRQ.
  116.  *
  117.  * If one device has multiple interrupts, there will be multiple irq_t
  118.  * instantions with the same devno.
  119.  */
  120. typedef struct irq {
  121.     /** Hash table link. */
  122.     link_t link;
  123.  
  124.     /** Lock protecting everything in this structure
  125.      *  except the link member. When both the IRQ
  126.      *  hash table lock and this lock are to be acquired,
  127.      *  this lock must not be taken first.
  128.      */
  129.     SPINLOCK_DECLARE(lock);
  130.    
  131.     /** Send EOI before processing the interrupt.
  132.      *  This is essential for timer interrupt which
  133.      *  has to be acknowledged before doing preemption
  134.      *  to make sure another timer interrupt will
  135.      *  be eventually generated.
  136.      */
  137.     bool preack;
  138.  
  139.     /** Unique device number. -1 if not yet assigned. */
  140.     devno_t devno;
  141.  
  142.     /** Actual IRQ number. -1 if not yet assigned. */
  143.     inr_t inr;
  144.     /** Trigger level of the IRQ. */
  145.     irq_trigger_t trigger;
  146.     /** Claim ownership of the IRQ. */
  147.     irq_ownership_t (* claim)(struct irq *);
  148.     /** Handler for this IRQ and device. */
  149.     irq_handler_t handler;
  150.     /** Instance argument for the handler and the claim function. */
  151.     void *instance;
  152.  
  153.     /** Clear interrupt routine. */
  154.     cir_t cir;
  155.     /** First argument to the clear interrupt routine. */
  156.     void *cir_arg;
  157.  
  158.     /** Notification configuration structure. */
  159.     ipc_notif_cfg_t notif_cfg;
  160. } irq_t;
  161.  
  162. SPINLOCK_EXTERN(irq_uspace_hash_table_lock);
  163. extern hash_table_t irq_uspace_hash_table;
  164.  
  165. extern void irq_init(size_t, size_t);
  166. extern void irq_initialize(irq_t *);
  167. extern void irq_register(irq_t *);
  168. extern irq_t *irq_dispatch_and_lock(inr_t);
  169.  
  170. #endif
  171.  
  172. #endif
  173.  
  174. /** @}
  175.  */
  176.