hw/smbus_ich9.c

   1 /*
   2  * ACPI implementation
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License version 2 as published by the Free Software Foundation.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  17  */
  18 /*
  19  *  Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
  20  *                     VA Linux Systems Japan K.K.
  21  *  Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
  22  *
  23  *  This is based on acpi.c, but heavily rewritten.
  24  */
  25 #include "hw.h"
  26 #include "pc.h"
  27 #include "pm_smbus.h"
  28 #include "pci.h"
  29 #include "sysemu.h"
  30 #include "i2c.h"
  31 #include "smbus.h"
  32
  33 #include "ich9.h"
  34
  35 #define TYPE_ICH9_SMB_DEVICE "ICH9 SMB"
  36 #define ICH9_SMB_DEVICE(obj) \
  37      OBJECT_CHECK(ICH9SMBState, (obj), TYPE_ICH9_SMB_DEVICE)
  38
  39 typedef struct ICH9SMBState {
  40     PCIDevice dev;
  41
  42     PMSMBus smb;
  43 } ICH9SMBState;
  44
  45 static const VMStateDescription vmstate_ich9_smbus = {
  46     .name = "ich9_smb",
  47     .version_id = 1,
  48     .minimum_version_id = 1,
  49     .minimum_version_id_old = 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             !(hostc & ICH9_SMB_HOSTC_I2C_EN)) {
  66             memory_region_set_enabled(&s->smb.io, true);
  67         } else {
  68             memory_region_set_enabled(&s->smb.io, false);
  69         }
  70     }
  71 }
  72
  73 static int ich9_smbus_initfn(PCIDevice *d)
  74 {
  75     ICH9SMBState *s = ICH9_SMB_DEVICE(d);
  76
  77     /* TODO? D31IP.SMIP in chipset configuration space */
  78     pci_config_set_interrupt_pin(d->config, 0x01); /* interrupt pin 1 */
  79
  80     pci_set_byte(d->config + ICH9_SMB_HOSTC, 0);
  81     /* TODO bar0, bar1: 64bit BAR support*/
  82
  83     pm_smbus_init(&d->qdev, &s->smb);
  84     pci_register_bar(d, ICH9_SMB_SMB_BASE_BAR, PCI_BASE_ADDRESS_SPACE_IO,
  85                      &s->smb.io);
  86     return 0;
  87 }
  88
  89 static void ich9_smb_class_init(ObjectClass *klass, void *data)
  90 {
  91     DeviceClass *dc = DEVICE_CLASS(klass);
  92     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
  93
  94     k->vendor_id = PCI_VENDOR_ID_INTEL;
  95     k->device_id = PCI_DEVICE_ID_INTEL_ICH9_6;
  96     k->revision = ICH9_A2_SMB_REVISION;
  97     k->class_id = PCI_CLASS_SERIAL_SMBUS;
  98     dc->no_user = 1;
  99     dc->vmsd = &vmstate_ich9_smbus;
 100     dc->desc = "ICH9 SMBUS Bridge";
 101     k->init = ich9_smbus_initfn;
 102     k->config_write = ich9_smbus_write_config;
 103 }
 104
 105 i2c_bus *ich9_smb_init(PCIBus *bus, int devfn, uint32_t smb_io_base)
 106 {
 107     PCIDevice *d =
 108         pci_create_simple_multifunction(bus, devfn, true, TYPE_ICH9_SMB_DEVICE);
 109     ICH9SMBState *s = ICH9_SMB_DEVICE(d);
 110     return s->smb.smbus;
 111 }
 112
 113 static const TypeInfo ich9_smb_info = {
 114     .name   = TYPE_ICH9_SMB_DEVICE,
 115     .parent = TYPE_PCI_DEVICE,
 116     .instance_size = sizeof(ICH9SMBState),
 117     .class_init = ich9_smb_class_init,
 118 };
 119
 120 static void ich9_smb_register(void)
 121 {
 122     type_register_static(&ich9_smb_info);
 123 }
 124
 125 type_init(ich9_smb_register);