hw/pci_bridge_dev.c

   1 /*
   2  * Standard PCI Bridge Device
   3  *
   4  * Copyright (c) 2011 Red Hat Inc. Author: Michael S. Tsirkin <mst@redhat.com>
   5  *
   6  * http://www.pcisig.com/specifications/conventional/pci_to_pci_bridge_architecture/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "hw/pci/pci_bridge.h"
  23 #include "hw/pci/pci_ids.h"
  24 #include "hw/pci/msi.h"
  25 #include "hw/pci/shpc.h"
  26 #include "hw/pci/slotid_cap.h"
  27 #include "exec/memory.h"
  28 #include "hw/pci/pci_bus.h"
  29
  30 struct PCIBridgeDev {
  31     PCIBridge bridge;
  32     MemoryRegion bar;
  33     uint8_t chassis_nr;
  34 #define PCI_BRIDGE_DEV_F_MSI_REQ 0
  35     uint32_t flags;
  36 };
  37 typedef struct PCIBridgeDev PCIBridgeDev;
  38
  39 static int pci_bridge_dev_initfn(PCIDevice *dev)
  40 {
  41     PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);
  42     PCIBridgeDev *bridge_dev = DO_UPCAST(PCIBridgeDev, bridge, br);
  43     int err;
  44
  45     err = pci_bridge_initfn(dev, TYPE_PCI_BUS);
  46     if (err) {
  47         goto bridge_error;
  48     }
  49     memory_region_init(&bridge_dev->bar, "shpc-bar", shpc_bar_size(dev));
  50     err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0);
  51     if (err) {
  52         goto shpc_error;
  53     }
  54     err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0);
  55     if (err) {
  56         goto slotid_error;
  57     }
  58     if ((bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_MSI_REQ)) &&
  59         msi_supported) {
  60         err = msi_init(dev, 0, 1, true, true);
  61         if (err < 0) {
  62             goto msi_error;
  63         }
  64     }
  65     /* TODO: spec recommends using 64 bit prefetcheable BAR.
  66      * Check whether that works well. */
  67     pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
  68                      PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar);
  69     dev->config[PCI_INTERRUPT_PIN] = 0x1;
  70     return 0;
  71 msi_error:
  72     slotid_cap_cleanup(dev);
  73 slotid_error:
  74     shpc_cleanup(dev, &bridge_dev->bar);
  75 shpc_error:
  76     memory_region_destroy(&bridge_dev->bar);
  77     pci_bridge_exitfn(dev);
  78 bridge_error:
  79     return err;
  80 }
  81
  82 static void pci_bridge_dev_exitfn(PCIDevice *dev)
  83 {
  84     PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);
  85     PCIBridgeDev *bridge_dev = DO_UPCAST(PCIBridgeDev, bridge, br);
  86     if (msi_present(dev)) {
  87         msi_uninit(dev);
  88     }
  89     slotid_cap_cleanup(dev);
  90     shpc_cleanup(dev, &bridge_dev->bar);
  91     memory_region_destroy(&bridge_dev->bar);
  92     pci_bridge_exitfn(dev);
  93 }
  94
  95 static void pci_bridge_dev_write_config(PCIDevice *d,
  96                                         uint32_t address, uint32_t val, int len)
  97 {
  98     pci_bridge_write_config(d, address, val, len);
  99     if (msi_present(d)) {
 100         msi_write_config(d, address, val, len);
 101     }
 102     shpc_cap_write_config(d, address, val, len);
 103 }
 104
 105 static void qdev_pci_bridge_dev_reset(DeviceState *qdev)
 106 {
 107     PCIDevice *dev = DO_UPCAST(PCIDevice, qdev, qdev);
 108
 109     pci_bridge_reset(qdev);
 110     shpc_reset(dev);
 111 }
 112
 113 static Property pci_bridge_dev_properties[] = {
 114                     /* Note: 0 is not a legal chassis number. */
 115     DEFINE_PROP_UINT8("chassis_nr", PCIBridgeDev, chassis_nr, 0),
 116     DEFINE_PROP_BIT("msi", PCIBridgeDev, flags, PCI_BRIDGE_DEV_F_MSI_REQ, true),
 117     DEFINE_PROP_END_OF_LIST(),
 118 };
 119
 120 static const VMStateDescription pci_bridge_dev_vmstate = {
 121     .name = "pci_bridge",
 122     .fields = (VMStateField[]) {
 123         VMSTATE_PCI_DEVICE(bridge.dev, PCIBridgeDev),
 124         SHPC_VMSTATE(bridge.dev.shpc, PCIBridgeDev),
 125         VMSTATE_END_OF_LIST()
 126     }
 127 };
 128
 129 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data)
 130 {
 131     DeviceClass *dc = DEVICE_CLASS(klass);
 132     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 133     k->init = pci_bridge_dev_initfn;
 134     k->exit = pci_bridge_dev_exitfn;
 135     k->config_write = pci_bridge_dev_write_config;
 136     k->vendor_id = PCI_VENDOR_ID_REDHAT;
 137     k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE;
 138     k->class_id = PCI_CLASS_BRIDGE_PCI;
 139     k->is_bridge = 1,
 140     dc->desc = "Standard PCI Bridge";
 141     dc->reset = qdev_pci_bridge_dev_reset;
 142     dc->props = pci_bridge_dev_properties;
 143     dc->vmsd = &pci_bridge_dev_vmstate;
 144 }
 145
 146 static const TypeInfo pci_bridge_dev_info = {
 147     .name = "pci-bridge",
 148     .parent        = TYPE_PCI_DEVICE,
 149     .instance_size = sizeof(PCIBridgeDev),
 150     .class_init = pci_bridge_dev_class_init,
 151 };
 152
 153 static void pci_bridge_dev_register(void)
 154 {
 155     type_register_static(&pci_bridge_dev_info);
 156 }
 157
 158 type_init(pci_bridge_dev_register);