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 memory_region_destroy(&bridge_dev->bar); 85 pci_bridge_exitfn(dev); 86 bridge_error: 87 return err; 88 } 89 90 static void pci_bridge_dev_exitfn(PCIDevice *dev) 91 { 92 PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); 93 if (msi_present(dev)) { 94 msi_uninit(dev); 95 } 96 slotid_cap_cleanup(dev); 97 shpc_cleanup(dev, &bridge_dev->bar); 98 memory_region_destroy(&bridge_dev->bar); 99 pci_bridge_exitfn(dev); 100 } 101 102 static void pci_bridge_dev_write_config(PCIDevice *d, 103 uint32_t address, uint32_t val, int len) 104 { 105 pci_bridge_write_config(d, address, val, len); 106 if (msi_present(d)) { 107 msi_write_config(d, address, val, len); 108 } 109 shpc_cap_write_config(d, address, val, len); 110 } 111 112 static void qdev_pci_bridge_dev_reset(DeviceState *qdev) 113 { 114 PCIDevice *dev = PCI_DEVICE(qdev); 115 116 pci_bridge_reset(qdev); 117 shpc_reset(dev); 118 } 119 120 static Property pci_bridge_dev_properties[] = { 121 /* Note: 0 is not a legal chassis number. */ 122 DEFINE_PROP_UINT8("chassis_nr", PCIBridgeDev, chassis_nr, 0), 123 DEFINE_PROP_BIT("msi", PCIBridgeDev, flags, PCI_BRIDGE_DEV_F_MSI_REQ, true), 124 DEFINE_PROP_END_OF_LIST(), 125 }; 126 127 static const VMStateDescription pci_bridge_dev_vmstate = { 128 .name = "pci_bridge", 129 .fields = (VMStateField[]) { 130 VMSTATE_PCI_DEVICE(parent_obj, PCIBridge), 131 SHPC_VMSTATE(shpc, PCIDevice), 132 VMSTATE_END_OF_LIST() 133 } 134 }; 135 136 static void pci_bridge_dev_class_init(ObjectClass *klass, void *data) 137 { 138 DeviceClass *dc = DEVICE_CLASS(klass); 139 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 140 HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); 141 142 k->init = pci_bridge_dev_initfn; 143 k->exit = pci_bridge_dev_exitfn; 144 k->config_write = pci_bridge_dev_write_config; 145 k->vendor_id = PCI_VENDOR_ID_REDHAT; 146 k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE; 147 k->class_id = PCI_CLASS_BRIDGE_PCI; 148 k->is_bridge = 1, 149 dc->desc = "Standard PCI Bridge"; 150 dc->reset = qdev_pci_bridge_dev_reset; 151 dc->props = pci_bridge_dev_properties; 152 dc->vmsd = &pci_bridge_dev_vmstate; 153 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 154 hc->plug = shpc_device_hotplug_cb; 155 hc->unplug = shpc_device_hot_unplug_cb; 156 } 157 158 static const TypeInfo pci_bridge_dev_info = { 159 .name = TYPE_PCI_BRIDGE_DEV, 160 .parent = TYPE_PCI_BRIDGE, 161 .instance_size = sizeof(PCIBridgeDev), 162 .class_init = pci_bridge_dev_class_init, 163 .interfaces = (InterfaceInfo[]) { 164 { TYPE_HOTPLUG_HANDLER }, 165 { } 166 } 167 }; 168 169 static void pci_bridge_dev_register(void) 170 { 171 type_register_static(&pci_bridge_dev_info); 172 } 173 174 type_init(pci_bridge_dev_register); 175