include/hw/timer/i8254_internal.h

   1 /*
   2  * QEMU 8253/8254 - internal interfaces
   3  *
   4  * Copyright (c) 2011 Jan Kiszka, Siemens AG
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #ifndef QEMU_I8254_INTERNAL_H
  26 #define QEMU_I8254_INTERNAL_H
  27
  28 #include "hw/hw.h"
  29 #include "hw/isa/isa.h"
  30 #include "qemu/timer.h"
  31
  32 typedef struct PITChannelState {
  33     int count; /* can be 65536 */
  34     uint16_t latched_count;
  35     uint8_t count_latched;
  36     uint8_t status_latched;
  37     uint8_t status;
  38     uint8_t read_state;
  39     uint8_t write_state;
  40     uint8_t write_latch;
  41     uint8_t rw_mode;
  42     uint8_t mode;
  43     uint8_t bcd; /* not supported */
  44     uint8_t gate; /* timer start */
  45     int64_t count_load_time;
  46     /* irq handling */
  47     int64_t next_transition_time;
  48     QEMUTimer *irq_timer;
  49     qemu_irq irq;
  50     uint32_t irq_disabled;
  51 } PITChannelState;
  52
  53 typedef struct PITCommonState {
  54     ISADevice dev;
  55     MemoryRegion ioports;
  56     uint32_t iobase;
  57     PITChannelState channels[3];
  58 } PITCommonState;
  59
  60 typedef struct PITCommonClass {
  61     ISADeviceClass parent_class;
  62
  63     void (*set_channel_gate)(PITCommonState *s, PITChannelState *sc, int val);
  64     void (*get_channel_info)(PITCommonState *s, PITChannelState *sc,
  65                              PITChannelInfo *info);
  66     void (*pre_save)(PITCommonState *s);
  67     void (*post_load)(PITCommonState *s);
  68 } PITCommonClass;
  69
  70 int pit_get_out(PITChannelState *s, int64_t current_time);
  71 int64_t pit_get_next_transition_time(PITChannelState *s, int64_t current_time);
  72 void pit_get_channel_info_common(PITCommonState *s, PITChannelState *sc,
  73                                  PITChannelInfo *info);
  74 void pit_reset_common(PITCommonState *s);
  75
  76 #endif /* QEMU_I8254_INTERNAL_H */