hw/isa/i82378.c

   1 /*
   2  * QEMU Intel i82378 emulation (PCI to ISA bridge)
   3  *
   4  * Copyright (c) 2010-2011 Hervé Poussineau
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "hw/pci/pci_device.h"
  22 #include "hw/irq.h"
  23 #include "hw/intc/i8259.h"
  24 #include "hw/timer/i8254.h"
  25 #include "migration/vmstate.h"
  26 #include "hw/audio/pcspk.h"
  27 #include "qom/object.h"
  28
  29 #define TYPE_I82378 "i82378"
  30 OBJECT_DECLARE_SIMPLE_TYPE(I82378State, I82378)
  31
  32 struct I82378State {
  33     PCIDevice parent_obj;
  34
  35     qemu_irq cpu_intr;
  36     qemu_irq *isa_irqs_in;
  37 };
  38
  39 static const VMStateDescription vmstate_i82378 = {
  40     .name = "pci-i82378",
  41     .version_id = 0,
  42     .minimum_version_id = 0,
  43     .fields = (VMStateField[]) {
  44         VMSTATE_PCI_DEVICE(parent_obj, I82378State),
  45         VMSTATE_END_OF_LIST()
  46     },
  47 };
  48
  49 static void i82378_request_out0_irq(void *opaque, int irq, int level)
  50 {
  51     I82378State *s = opaque;
  52     qemu_set_irq(s->cpu_intr, level);
  53 }
  54
  55 static void i82378_request_pic_irq(void *opaque, int irq, int level)
  56 {
  57     DeviceState *dev = opaque;
  58     I82378State *s = I82378(dev);
  59
  60     qemu_set_irq(s->isa_irqs_in[irq], level);
  61 }
  62
  63 static void i82378_realize(PCIDevice *pci, Error **errp)
  64 {
  65     DeviceState *dev = DEVICE(pci);
  66     I82378State *s = I82378(dev);
  67     uint8_t *pci_conf;
  68     ISABus *isabus;
  69     ISADevice *pit;
  70
  71     pci_conf = pci->config;
  72     pci_set_word(pci_conf + PCI_COMMAND,
  73                  PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
  74     pci_set_word(pci_conf + PCI_STATUS,
  75                  PCI_STATUS_DEVSEL_MEDIUM);
  76
  77     pci_config_set_interrupt_pin(pci_conf, 1); /* interrupt pin 0 */
  78
  79     isabus = isa_bus_new(dev, get_system_memory(),
  80                          pci_address_space_io(pci), errp);
  81     if (!isabus) {
  82         return;
  83     }
  84
  85     /* This device has:
  86        2 82C59 (irq)
  87        1 82C54 (pit)
  88        2 82C37 (dma)
  89        NMI
  90        Utility Bus Support Registers
  91
  92        All devices accept byte access only, except timer
  93      */
  94
  95     /* 2 82C59 (irq) */
  96     s->isa_irqs_in = i8259_init(isabus,
  97                                 qemu_allocate_irq(i82378_request_out0_irq,
  98                                                   s, 0));
  99     isa_bus_register_input_irqs(isabus, s->isa_irqs_in);
 100
 101     /* 1 82C54 (pit) */
 102     pit = i8254_pit_init(isabus, 0x40, 0, NULL);
 103
 104     /* speaker */
 105     pcspk_init(isa_new(TYPE_PC_SPEAKER), isabus, pit);
 106
 107     /* 2 82C37 (dma) */
 108     isa_create_simple(isabus, "i82374");
 109 }
 110
 111 static void i82378_init(Object *obj)
 112 {
 113     DeviceState *dev = DEVICE(obj);
 114     I82378State *s = I82378(obj);
 115
 116     qdev_init_gpio_out(dev, &s->cpu_intr, 1);
 117     qdev_init_gpio_in(dev, i82378_request_pic_irq, 16);
 118 }
 119
 120 static void i82378_class_init(ObjectClass *klass, void *data)
 121 {
 122     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 123     DeviceClass *dc = DEVICE_CLASS(klass);
 124
 125     k->realize = i82378_realize;
 126     k->vendor_id = PCI_VENDOR_ID_INTEL;
 127     k->device_id = PCI_DEVICE_ID_INTEL_82378;
 128     k->revision = 0x03;
 129     k->class_id = PCI_CLASS_BRIDGE_ISA;
 130     dc->vmsd = &vmstate_i82378;
 131     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 132 }
 133
 134 static const TypeInfo i82378_type_info = {
 135     .name = TYPE_I82378,
 136     .parent = TYPE_PCI_DEVICE,
 137     .instance_size = sizeof(I82378State),
 138     .instance_init = i82378_init,
 139     .class_init = i82378_class_init,
 140     .interfaces = (InterfaceInfo[]) {
 141         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 142         { },
 143     },
 144 };
 145
 146 static void i82378_register_types(void)
 147 {
 148     type_register_static(&i82378_type_info);
 149 }
 150
 151 type_init(i82378_register_types)