hw/pci-host/gpex.c

   1 /*
   2  * QEMU Generic PCI Express Bridge Emulation
   3  *
   4  * Copyright (C) 2015 Alexander Graf <agraf@suse.de>
   5  *
   6  * Code loosely based on q35.c.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  *
  26  * Check out these documents for more information on the device:
  27  *
  28  * http://www.kernel.org/doc/Documentation/devicetree/bindings/pci/host-generic-pci.txt
  29  * http://www.firmware.org/1275/practice/imap/imap0_9d.pdf
  30  */
  31 #include "qemu/osdep.h"
  32 #include "hw/hw.h"
  33 #include "hw/pci-host/gpex.h"
  34
  35 /****************************************************************************
  36  * GPEX host
  37  */
  38
  39 static void gpex_set_irq(void *opaque, int irq_num, int level)
  40 {
  41     GPEXHost *s = opaque;
  42
  43     qemu_set_irq(s->irq[irq_num], level);
  44 }
  45
  46 int gpex_set_irq_num(GPEXHost *s, int index, int gsi)
  47 {
  48     if (index >= GPEX_NUM_IRQS) {
  49         return -EINVAL;
  50     }
  51
  52     s->irq_num[index] = gsi;
  53     return 0;
  54 }
  55
  56 static PCIINTxRoute gpex_route_intx_pin_to_irq(void *opaque, int pin)
  57 {
  58     PCIINTxRoute route;
  59     GPEXHost *s = opaque;
  60
  61     route.mode = PCI_INTX_ENABLED;
  62     route.irq = s->irq_num[pin];
  63
  64     return route;
  65 }
  66
  67 static void gpex_host_realize(DeviceState *dev, Error **errp)
  68 {
  69     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
  70     GPEXHost *s = GPEX_HOST(dev);
  71     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
  72     PCIExpressHost *pex = PCIE_HOST_BRIDGE(dev);
  73     int i;
  74
  75     pcie_host_mmcfg_init(pex, PCIE_MMCFG_SIZE_MAX);
  76     memory_region_init(&s->io_mmio, OBJECT(s), "gpex_mmio", UINT64_MAX);
  77     memory_region_init(&s->io_ioport, OBJECT(s), "gpex_ioport", 64 * 1024);
  78
  79     sysbus_init_mmio(sbd, &pex->mmio);
  80     sysbus_init_mmio(sbd, &s->io_mmio);
  81     sysbus_init_mmio(sbd, &s->io_ioport);
  82     for (i = 0; i < GPEX_NUM_IRQS; i++) {
  83         sysbus_init_irq(sbd, &s->irq[i]);
  84     }
  85
  86     pci->bus = pci_register_bus(dev, "pcie.0", gpex_set_irq,
  87                                 pci_swizzle_map_irq_fn, s, &s->io_mmio,
  88                                 &s->io_ioport, 0, 4, TYPE_PCIE_BUS);
  89
  90     qdev_set_parent_bus(DEVICE(&s->gpex_root), BUS(pci->bus));
  91     pci_bus_set_route_irq_fn(pci->bus, gpex_route_intx_pin_to_irq);
  92     qdev_init_nofail(DEVICE(&s->gpex_root));
  93 }
  94
  95 static const char *gpex_host_root_bus_path(PCIHostState *host_bridge,
  96                                           PCIBus *rootbus)
  97 {
  98     return "0000:00";
  99 }
 100
 101 static void gpex_host_class_init(ObjectClass *klass, void *data)
 102 {
 103     DeviceClass *dc = DEVICE_CLASS(klass);
 104     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
 105
 106     hc->root_bus_path = gpex_host_root_bus_path;
 107     dc->realize = gpex_host_realize;
 108     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 109     dc->fw_name = "pci";
 110 }
 111
 112 static void gpex_host_initfn(Object *obj)
 113 {
 114     GPEXHost *s = GPEX_HOST(obj);
 115     GPEXRootState *root = &s->gpex_root;
 116
 117     object_initialize(root, sizeof(*root), TYPE_GPEX_ROOT_DEVICE);
 118     object_property_add_child(obj, "gpex_root", OBJECT(root), NULL);
 119     qdev_prop_set_int32(DEVICE(root), "addr", PCI_DEVFN(0, 0));
 120     qdev_prop_set_bit(DEVICE(root), "multifunction", false);
 121 }
 122
 123 static const TypeInfo gpex_host_info = {
 124     .name       = TYPE_GPEX_HOST,
 125     .parent     = TYPE_PCIE_HOST_BRIDGE,
 126     .instance_size = sizeof(GPEXHost),
 127     .instance_init = gpex_host_initfn,
 128     .class_init = gpex_host_class_init,
 129 };
 130
 131 /****************************************************************************
 132  * GPEX Root D0:F0
 133  */
 134
 135 static const VMStateDescription vmstate_gpex_root = {
 136     .name = "gpex_root",
 137     .version_id = 1,
 138     .minimum_version_id = 1,
 139     .fields = (VMStateField[]) {
 140         VMSTATE_PCI_DEVICE(parent_obj, GPEXRootState),
 141         VMSTATE_END_OF_LIST()
 142     }
 143 };
 144
 145 static void gpex_root_class_init(ObjectClass *klass, void *data)
 146 {
 147     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 148     DeviceClass *dc = DEVICE_CLASS(klass);
 149
 150     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 151     dc->desc = "QEMU generic PCIe host bridge";
 152     dc->vmsd = &vmstate_gpex_root;
 153     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 154     k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_HOST;
 155     k->revision = 0;
 156     k->class_id = PCI_CLASS_BRIDGE_HOST;
 157     /*
 158      * PCI-facing part of the host bridge, not usable without the
 159      * host-facing part, which can't be device_add'ed, yet.
 160      */
 161     dc->user_creatable = false;
 162 }
 163
 164 static const TypeInfo gpex_root_info = {
 165     .name = TYPE_GPEX_ROOT_DEVICE,
 166     .parent = TYPE_PCI_DEVICE,
 167     .instance_size = sizeof(GPEXRootState),
 168     .class_init = gpex_root_class_init,
 169 };
 170
 171 static void gpex_register(void)
 172 {
 173     type_register_static(&gpex_root_info);
 174     type_register_static(&gpex_host_info);
 175 }
 176
 177 type_init(gpex_register)