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
  32 #include "qemu/osdep.h"
  33 #include "qapi/error.h"
  34 #include "hw/irq.h"
  35 #include "hw/pci-host/gpex.h"
  36 #include "hw/qdev-properties.h"
  37 #include "migration/vmstate.h"
  38 #include "qemu/module.h"
  39
  40 /****************************************************************************
  41  * GPEX host
  42  */
  43
  44 static void gpex_set_irq(void *opaque, int irq_num, int level)
  45 {
  46     GPEXHost *s = opaque;
  47
  48     qemu_set_irq(s->irq[irq_num], level);
  49 }
  50
  51 int gpex_set_irq_num(GPEXHost *s, int index, int gsi)
  52 {
  53     if (index >= GPEX_NUM_IRQS) {
  54         return -EINVAL;
  55     }
  56
  57     s->irq_num[index] = gsi;
  58     return 0;
  59 }
  60
  61 static PCIINTxRoute gpex_route_intx_pin_to_irq(void *opaque, int pin)
  62 {
  63     PCIINTxRoute route;
  64     GPEXHost *s = opaque;
  65     int gsi = s->irq_num[pin];
  66
  67     route.irq = gsi;
  68     if (gsi < 0) {
  69         route.mode = PCI_INTX_DISABLED;
  70     } else {
  71         route.mode = PCI_INTX_ENABLED;
  72     }
  73
  74     return route;
  75 }
  76
  77 static void gpex_host_realize(DeviceState *dev, Error **errp)
  78 {
  79     PCIHostState *pci = PCI_HOST_BRIDGE(dev);
  80     GPEXHost *s = GPEX_HOST(dev);
  81     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
  82     PCIExpressHost *pex = PCIE_HOST_BRIDGE(dev);
  83     int i;
  84
  85     pcie_host_mmcfg_init(pex, PCIE_MMCFG_SIZE_MAX);
  86     memory_region_init(&s->io_mmio, OBJECT(s), "gpex_mmio", UINT64_MAX);
  87     memory_region_init(&s->io_ioport, OBJECT(s), "gpex_ioport", 64 * 1024);
  88
  89     sysbus_init_mmio(sbd, &pex->mmio);
  90     sysbus_init_mmio(sbd, &s->io_mmio);
  91     sysbus_init_mmio(sbd, &s->io_ioport);
  92     for (i = 0; i < GPEX_NUM_IRQS; i++) {
  93         sysbus_init_irq(sbd, &s->irq[i]);
  94         s->irq_num[i] = -1;
  95     }
  96
  97     pci->bus = pci_register_root_bus(dev, "pcie.0", gpex_set_irq,
  98                                      pci_swizzle_map_irq_fn, s, &s->io_mmio,
  99                                      &s->io_ioport, 0, 4, TYPE_PCIE_BUS);
 100
 101     pci_bus_set_route_irq_fn(pci->bus, gpex_route_intx_pin_to_irq);
 102     qdev_realize(DEVICE(&s->gpex_root), BUS(pci->bus), &error_fatal);
 103 }
 104
 105 static const char *gpex_host_root_bus_path(PCIHostState *host_bridge,
 106                                           PCIBus *rootbus)
 107 {
 108     return "0000:00";
 109 }
 110
 111 static void gpex_host_class_init(ObjectClass *klass, void *data)
 112 {
 113     DeviceClass *dc = DEVICE_CLASS(klass);
 114     PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
 115
 116     hc->root_bus_path = gpex_host_root_bus_path;
 117     dc->realize = gpex_host_realize;
 118     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 119     dc->fw_name = "pci";
 120 }
 121
 122 static void gpex_host_initfn(Object *obj)
 123 {
 124     GPEXHost *s = GPEX_HOST(obj);
 125     GPEXRootState *root = &s->gpex_root;
 126
 127     object_initialize_child(obj, "gpex_root",  root, sizeof(*root),
 128                             TYPE_GPEX_ROOT_DEVICE, &error_abort, NULL);
 129     qdev_prop_set_int32(DEVICE(root), "addr", PCI_DEVFN(0, 0));
 130     qdev_prop_set_bit(DEVICE(root), "multifunction", false);
 131 }
 132
 133 static const TypeInfo gpex_host_info = {
 134     .name       = TYPE_GPEX_HOST,
 135     .parent     = TYPE_PCIE_HOST_BRIDGE,
 136     .instance_size = sizeof(GPEXHost),
 137     .instance_init = gpex_host_initfn,
 138     .class_init = gpex_host_class_init,
 139 };
 140
 141 /****************************************************************************
 142  * GPEX Root D0:F0
 143  */
 144
 145 static const VMStateDescription vmstate_gpex_root = {
 146     .name = "gpex_root",
 147     .version_id = 1,
 148     .minimum_version_id = 1,
 149     .fields = (VMStateField[]) {
 150         VMSTATE_PCI_DEVICE(parent_obj, GPEXRootState),
 151         VMSTATE_END_OF_LIST()
 152     }
 153 };
 154
 155 static void gpex_root_class_init(ObjectClass *klass, void *data)
 156 {
 157     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 158     DeviceClass *dc = DEVICE_CLASS(klass);
 159
 160     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 161     dc->desc = "QEMU generic PCIe host bridge";
 162     dc->vmsd = &vmstate_gpex_root;
 163     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 164     k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_HOST;
 165     k->revision = 0;
 166     k->class_id = PCI_CLASS_BRIDGE_HOST;
 167     /*
 168      * PCI-facing part of the host bridge, not usable without the
 169      * host-facing part, which can't be device_add'ed, yet.
 170      */
 171     dc->user_creatable = false;
 172 }
 173
 174 static const TypeInfo gpex_root_info = {
 175     .name = TYPE_GPEX_ROOT_DEVICE,
 176     .parent = TYPE_PCI_DEVICE,
 177     .instance_size = sizeof(GPEXRootState),
 178     .class_init = gpex_root_class_init,
 179     .interfaces = (InterfaceInfo[]) {
 180         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
 181         { },
 182     },
 183 };
 184
 185 static void gpex_register(void)
 186 {
 187     type_register_static(&gpex_root_info);
 188     type_register_static(&gpex_host_info);
 189 }
 190
 191 type_init(gpex_register)