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/*
* Standard PCI Bridge Device
*
* Copyright (c) 2011 Red Hat Inc. Author: Michael S. Tsirkin <mst@redhat.com>
*
* http://www.pcisig.com/specifications/conventional/pci_to_pci_bridge_architecture/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "hw/pci/pci_bridge.h"
#include "hw/pci/pci_ids.h"
#include "hw/pci/msi.h"
#include "hw/pci/shpc.h"
#include "hw/pci/slotid_cap.h"
#include "exec/memory.h"
#include "hw/pci/pci_bus.h"
struct PCIBridgeDev {
PCIBridge bridge;
MemoryRegion bar;
uint8_t chassis_nr;
#define PCI_BRIDGE_DEV_F_MSI_REQ 0
uint32_t flags;
};
typedef struct PCIBridgeDev PCIBridgeDev;
/* Mapping mandated by PCI-to-PCI Bridge architecture specification,
* revision 1.2 */
/* Table 9-1: Interrupt Binding for Devices Behind a Bridge */
static int pci_bridge_dev_map_irq_fn(PCIDevice *dev, int irq_num)
{
return (irq_num + PCI_SLOT(dev->devfn)) % PCI_NUM_PINS;
}
static int pci_bridge_dev_initfn(PCIDevice *dev)
{
PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);
PCIBridgeDev *bridge_dev = DO_UPCAST(PCIBridgeDev, bridge, br);
int err;
pci_bridge_map_irq(br, NULL, pci_bridge_dev_map_irq_fn);
err = pci_bridge_initfn(dev);
if (err) {
goto bridge_error;
}
memory_region_init(&bridge_dev->bar, "shpc-bar", shpc_bar_size(dev));
err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0);
if (err) {
goto shpc_error;
}
err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0);
if (err) {
goto slotid_error;
}
if ((bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_MSI_REQ)) &&
msi_supported) {
err = msi_init(dev, 0, 1, true, true);
if (err < 0) {
goto msi_error;
}
}
/* TODO: spec recommends using 64 bit prefetcheable BAR.
* Check whether that works well. */
pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar);
dev->config[PCI_INTERRUPT_PIN] = 0x1;
return 0;
msi_error:
slotid_cap_cleanup(dev);
slotid_error:
shpc_cleanup(dev, &bridge_dev->bar);
shpc_error:
memory_region_destroy(&bridge_dev->bar);
pci_bridge_exitfn(dev);
bridge_error:
return err;
}
static void pci_bridge_dev_exitfn(PCIDevice *dev)
{
PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);
PCIBridgeDev *bridge_dev = DO_UPCAST(PCIBridgeDev, bridge, br);
if (msi_present(dev)) {
msi_uninit(dev);
}
slotid_cap_cleanup(dev);
shpc_cleanup(dev, &bridge_dev->bar);
memory_region_destroy(&bridge_dev->bar);
pci_bridge_exitfn(dev);
}
static void pci_bridge_dev_write_config(PCIDevice *d,
uint32_t address, uint32_t val, int len)
{
pci_bridge_write_config(d, address, val, len);
if (msi_present(d)) {
msi_write_config(d, address, val, len);
}
shpc_cap_write_config(d, address, val, len);
}
static void qdev_pci_bridge_dev_reset(DeviceState *qdev)
{
PCIDevice *dev = DO_UPCAST(PCIDevice, qdev, qdev);
pci_bridge_reset(qdev);
shpc_reset(dev);
}
static Property pci_bridge_dev_properties[] = {
/* Note: 0 is not a legal chassis number. */
DEFINE_PROP_UINT8("chassis_nr", PCIBridgeDev, chassis_nr, 0),
DEFINE_PROP_BIT("msi", PCIBridgeDev, flags, PCI_BRIDGE_DEV_F_MSI_REQ, true),
DEFINE_PROP_END_OF_LIST(),
};
static const VMStateDescription pci_bridge_dev_vmstate = {
.name = "pci_bridge",
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(bridge.dev, PCIBridgeDev),
SHPC_VMSTATE(bridge.dev.shpc, PCIBridgeDev),
VMSTATE_END_OF_LIST()
}
};
static void pci_bridge_dev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
k->init = pci_bridge_dev_initfn;
k->exit = pci_bridge_dev_exitfn;
k->config_write = pci_bridge_dev_write_config;
k->vendor_id = PCI_VENDOR_ID_REDHAT;
k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE;
k->class_id = PCI_CLASS_BRIDGE_PCI;
k->is_bridge = 1,
dc->desc = "Standard PCI Bridge";
dc->reset = qdev_pci_bridge_dev_reset;
dc->props = pci_bridge_dev_properties;
dc->vmsd = &pci_bridge_dev_vmstate;
}
static const TypeInfo pci_bridge_dev_info = {
.name = "pci-bridge",
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(PCIBridgeDev),
.class_init = pci_bridge_dev_class_init,
};
static void pci_bridge_dev_register(void)
{
type_register_static(&pci_bridge_dev_info);
}
type_init(pci_bridge_dev_register);
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