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 #include "hw/hotplug.h" 30 31 #define TYPE_PCI_BRIDGE_DEV "pci-bridge" 32 #define PCI_BRIDGE_DEV(obj) \ 33 OBJECT_CHECK(PCIBridgeDev, (obj), TYPE_PCI_BRIDGE_DEV) 34 35 struct PCIBridgeDev { 36 /*< private >*/ 37 PCIBridge parent_obj; 38 /*< public >*/ 39 40 MemoryRegion bar; 41 uint8_t chassis_nr; 42 #define PCI_BRIDGE_DEV_F_MSI_REQ 0 43 uint32_t flags; 44 }; 45 typedef struct PCIBridgeDev PCIBridgeDev; 46 47 static int pci_bridge_dev_initfn(PCIDevice *dev) 48 { 49 PCIBridge *br = PCI_BRIDGE(dev); 50 PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); 51 int err; 52 53 err = pci_bridge_initfn(dev, TYPE_PCI_BUS); 54 if (err) { 55 goto bridge_error; 56 } 57 dev->config[PCI_INTERRUPT_PIN] = 0x1; 58 memory_region_init(&bridge_dev->bar, OBJECT(dev), "shpc-bar", shpc_bar_size(dev)); 59 err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0); 60 if (err) { 61 goto shpc_error; 62 } 63 err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0); 64 if (err) { 65 goto slotid_error; 66 } 67 if ((bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_MSI_REQ)) && 68 msi_supported) { 69 err = msi_init(dev, 0, 1, true, true); 70 if (err < 0) { 71 goto msi_error; 72 } 73 } 74 /* TODO: spec recommends using 64 bit prefetcheable BAR. 75 * Check whether that works well. */ 76 pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY | 77 PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar); 78 return 0; 79 msi_error: 80 slotid_cap_cleanup(dev); 81 slotid_error: 82 shpc_cleanup(dev, &bridge_dev->bar); 83 shpc_error: 84 pci_bridge_exitfn(dev); 85 bridge_error: 86 return err; 87 } 88 89 static void pci_bridge_dev_exitfn(PCIDevice *dev) 90 { 91 PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); 92 if (msi_present(dev)) { 93 msi_uninit(dev); 94 } 95 slotid_cap_cleanup(dev); 96 shpc_cleanup(dev, &bridge_dev->bar); 97 pci_bridge_exitfn(dev); 98 } 99 100 static void pci_bridge_dev_instance_finalize(Object *obj) 101 { 102 shpc_free(PCI_DEVICE(obj)); 103 } 104 105 static void pci_bridge_dev_write_config(PCIDevice *d, 106 uint32_t address, uint32_t val, int len) 107 { 108 pci_bridge_write_config(d, address, val, len); 109 if (msi_present(d)) { 110 msi_write_config(d, address, val, len); 111 } 112 shpc_cap_write_config(d, address, val, len); 113 } 114 115 static void qdev_pci_bridge_dev_reset(DeviceState *qdev) 116 { 117 PCIDevice *dev = PCI_DEVICE(qdev); 118 119 pci_bridge_reset(qdev); 120 shpc_reset(dev); 121 } 122 123 static Property pci_bridge_dev_properties[] = { 124 /* Note: 0 is not a legal chassis number. */ 125 DEFINE_PROP_UINT8("chassis_nr", PCIBridgeDev, chassis_nr, 0), 126 DEFINE_PROP_BIT("msi", PCIBridgeDev, flags, PCI_BRIDGE_DEV_F_MSI_REQ, true), 127 DEFINE_PROP_END_OF_LIST(), 128 }; 129 130 static const VMStateDescription pci_bridge_dev_vmstate = { 131 .name = "pci_bridge", 132 .fields = (VMStateField[]) { 133 VMSTATE_PCI_DEVICE(parent_obj, PCIBridge), 134 SHPC_VMSTATE(shpc, PCIDevice), 135 VMSTATE_END_OF_LIST() 136 } 137 }; 138 139 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data) 140 { 141 DeviceClass *dc = DEVICE_CLASS(klass); 142 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 143 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 144 145 k->init = pci_bridge_dev_initfn; 146 k->exit = pci_bridge_dev_exitfn; 147 k->config_write = pci_bridge_dev_write_config; 148 k->vendor_id = PCI_VENDOR_ID_REDHAT; 149 k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE; 150 k->class_id = PCI_CLASS_BRIDGE_PCI; 151 k->is_bridge = 1, 152 dc->desc = "Standard PCI Bridge"; 153 dc->reset = qdev_pci_bridge_dev_reset; 154 dc->props = pci_bridge_dev_properties; 155 dc->vmsd = &pci_bridge_dev_vmstate; 156 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 157 hc->plug = shpc_device_hotplug_cb; 158 hc->unplug_request = shpc_device_hot_unplug_request_cb; 159 } 160 161 static const TypeInfo pci_bridge_dev_info = { 162 .name = TYPE_PCI_BRIDGE_DEV, 163 .parent = TYPE_PCI_BRIDGE, 164 .instance_size = sizeof(PCIBridgeDev), 165 .class_init = pci_bridge_dev_class_init, 166 .instance_finalize = pci_bridge_dev_instance_finalize, 167 .interfaces = (InterfaceInfo[]) { 168 { TYPE_HOTPLUG_HANDLER }, 169 { } 170 } 171 }; 172 173 static void pci_bridge_dev_register(void) 174 { 175 type_register_static(&pci_bridge_dev_info); 176 } 177 178 type_init(pci_bridge_dev_register); 179