1 /* 2 * ACPI implementation 3 * 4 * Copyright (c) 2006 Fabrice Bellard 5 * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp> 6 * VA Linux Systems Japan K.K. 7 * Copyright (C) 2012 Jason Baron <jbaron@redhat.com> 8 * 9 * This is based on acpi.c, but heavily rewritten. 10 * 11 * This library is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU Lesser General Public 13 * License version 2 as published by the Free Software Foundation. 14 * 15 * This library is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with this library; if not, see <http://www.gnu.org/licenses/> 22 * 23 * Contributions after 2012-01-13 are licensed under the terms of the 24 * GNU GPL, version 2 or (at your option) any later version. 25 * 26 */ 27 #include "qemu/osdep.h" 28 #include "hw/hw.h" 29 #include "hw/i2c/pm_smbus.h" 30 #include "hw/pci/pci.h" 31 #include "sysemu/sysemu.h" 32 33 #include "hw/i386/ich9.h" 34 35 #define ICH9_SMB_DEVICE(obj) \ 36 OBJECT_CHECK(ICH9SMBState, (obj), TYPE_ICH9_SMB_DEVICE) 37 38 typedef struct ICH9SMBState { 39 PCIDevice dev; 40 41 bool irq_enabled; 42 43 PMSMBus smb; 44 } ICH9SMBState; 45 46 static const VMStateDescription vmstate_ich9_smbus = { 47 .name = "ich9_smb", 48 .version_id = 1, 49 .minimum_version_id = 1, 50 .fields = (VMStateField[]) { 51 VMSTATE_PCI_DEVICE(dev, struct ICH9SMBState), 52 VMSTATE_END_OF_LIST() 53 } 54 }; 55 56 static void ich9_smbus_write_config(PCIDevice *d, uint32_t address, 57 uint32_t val, int len) 58 { 59 ICH9SMBState *s = ICH9_SMB_DEVICE(d); 60 61 pci_default_write_config(d, address, val, len); 62 if (range_covers_byte(address, len, ICH9_SMB_HOSTC)) { 63 uint8_t hostc = s->dev.config[ICH9_SMB_HOSTC]; 64 if (hostc & ICH9_SMB_HOSTC_HST_EN) { 65 memory_region_set_enabled(&s->smb.io, true); 66 } else { 67 memory_region_set_enabled(&s->smb.io, false); 68 } 69 s->smb.i2c_enable = (hostc & ICH9_SMB_HOSTC_I2C_EN) != 0; 70 if (hostc & ICH9_SMB_HOSTC_SSRESET) { 71 s->smb.reset(&s->smb); 72 s->dev.config[ICH9_SMB_HOSTC] &= ~ICH9_SMB_HOSTC_SSRESET; 73 } 74 } 75 } 76 77 static void ich9_smbus_realize(PCIDevice *d, Error **errp) 78 { 79 ICH9SMBState *s = ICH9_SMB_DEVICE(d); 80 81 /* TODO? D31IP.SMIP in chipset configuration space */ 82 pci_config_set_interrupt_pin(d->config, 0x01); /* interrupt pin 1 */ 83 84 pci_set_byte(d->config + ICH9_SMB_HOSTC, 0); 85 /* TODO bar0, bar1: 64bit BAR support*/ 86 87 pm_smbus_init(&d->qdev, &s->smb, false); 88 pci_register_bar(d, ICH9_SMB_SMB_BASE_BAR, PCI_BASE_ADDRESS_SPACE_IO, 89 &s->smb.io); 90 } 91 92 static void ich9_smb_class_init(ObjectClass *klass, void *data) 93 { 94 DeviceClass *dc = DEVICE_CLASS(klass); 95 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 96 97 k->vendor_id = PCI_VENDOR_ID_INTEL; 98 k->device_id = PCI_DEVICE_ID_INTEL_ICH9_6; 99 k->revision = ICH9_A2_SMB_REVISION; 100 k->class_id = PCI_CLASS_SERIAL_SMBUS; 101 dc->vmsd = &vmstate_ich9_smbus; 102 dc->desc = "ICH9 SMBUS Bridge"; 103 k->realize = ich9_smbus_realize; 104 k->config_write = ich9_smbus_write_config; 105 /* 106 * Reason: part of ICH9 southbridge, needs to be wired up by 107 * pc_q35_init() 108 */ 109 dc->user_creatable = false; 110 } 111 112 static void ich9_smb_set_irq(PMSMBus *pmsmb, bool enabled) 113 { 114 ICH9SMBState *s = pmsmb->opaque; 115 116 if (enabled == s->irq_enabled) { 117 return; 118 } 119 120 s->irq_enabled = enabled; 121 pci_set_irq(&s->dev, enabled); 122 } 123 124 I2CBus *ich9_smb_init(PCIBus *bus, int devfn, uint32_t smb_io_base) 125 { 126 PCIDevice *d = 127 pci_create_simple_multifunction(bus, devfn, true, TYPE_ICH9_SMB_DEVICE); 128 ICH9SMBState *s = ICH9_SMB_DEVICE(d); 129 s->smb.set_irq = ich9_smb_set_irq; 130 s->smb.opaque = s; 131 return s->smb.smbus; 132 } 133 134 static const TypeInfo ich9_smb_info = { 135 .name = TYPE_ICH9_SMB_DEVICE, 136 .parent = TYPE_PCI_DEVICE, 137 .instance_size = sizeof(ICH9SMBState), 138 .class_init = ich9_smb_class_init, 139 .interfaces = (InterfaceInfo[]) { 140 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 141 { }, 142 }, 143 }; 144 145 static void ich9_smb_register(void) 146 { 147 type_register_static(&ich9_smb_info); 148 } 149 150 type_init(ich9_smb_register); 151