hw/i2c/smbus_ich9.c

   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/i386/pc.h"
  30 #include "hw/i2c/pm_smbus.h"
  31 #include "hw/pci/pci.h"
  32 #include "sysemu/sysemu.h"
  33 #include "hw/i2c/i2c.h"
  34 #include "hw/i2c/smbus.h"
  35
  36 #include "hw/i386/ich9.h"
  37
  38 #define ICH9_SMB_DEVICE(obj) \
  39      OBJECT_CHECK(ICH9SMBState, (obj), TYPE_ICH9_SMB_DEVICE)
  40
  41 typedef struct ICH9SMBState {
  42     PCIDevice dev;
  43
  44     PMSMBus smb;
  45 } ICH9SMBState;
  46
  47 static const VMStateDescription vmstate_ich9_smbus = {
  48     .name = "ich9_smb",
  49     .version_id = 1,
  50     .minimum_version_id = 1,
  51     .fields = (VMStateField[]) {
  52         VMSTATE_PCI_DEVICE(dev, struct ICH9SMBState),
  53         VMSTATE_END_OF_LIST()
  54     }
  55 };
  56
  57 static void ich9_smbus_write_config(PCIDevice *d, uint32_t address,
  58                                     uint32_t val, int len)
  59 {
  60     ICH9SMBState *s = ICH9_SMB_DEVICE(d);
  61
  62     pci_default_write_config(d, address, val, len);
  63     if (range_covers_byte(address, len, ICH9_SMB_HOSTC)) {
  64         uint8_t hostc = s->dev.config[ICH9_SMB_HOSTC];
  65         if ((hostc & ICH9_SMB_HOSTC_HST_EN) &&
  66             !(hostc & ICH9_SMB_HOSTC_I2C_EN)) {
  67             memory_region_set_enabled(&s->smb.io, true);
  68         } else {
  69             memory_region_set_enabled(&s->smb.io, false);
  70         }
  71     }
  72 }
  73
  74 static void ich9_smbus_realize(PCIDevice *d, Error **errp)
  75 {
  76     ICH9SMBState *s = ICH9_SMB_DEVICE(d);
  77
  78     /* TODO? D31IP.SMIP in chipset configuration space */
  79     pci_config_set_interrupt_pin(d->config, 0x01); /* interrupt pin 1 */
  80
  81     pci_set_byte(d->config + ICH9_SMB_HOSTC, 0);
  82     /* TODO bar0, bar1: 64bit BAR support*/
  83
  84     pm_smbus_init(&d->qdev, &s->smb);
  85     pci_register_bar(d, ICH9_SMB_SMB_BASE_BAR, PCI_BASE_ADDRESS_SPACE_IO,
  86                      &s->smb.io);
  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->vmsd = &vmstate_ich9_smbus;
  99     dc->desc = "ICH9 SMBUS Bridge";
 100     k->realize = ich9_smbus_realize;
 101     k->config_write = ich9_smbus_write_config;
 102     /*
 103      * Reason: part of ICH9 southbridge, needs to be wired up by
 104      * pc_q35_init()
 105      */
 106     dc->user_creatable = false;
 107 }
 108
 109 I2CBus *ich9_smb_init(PCIBus *bus, int devfn, uint32_t smb_io_base)
 110 {
 111     PCIDevice *d =
 112         pci_create_simple_multifunction(bus, devfn, true, TYPE_ICH9_SMB_DEVICE);
 113     ICH9SMBState *s = ICH9_SMB_DEVICE(d);
 114     return s->smb.smbus;
 115 }
 116
 117 static const TypeInfo ich9_smb_info = {
 118     .name   = TYPE_ICH9_SMB_DEVICE,
 119     .parent = TYPE_PCI_DEVICE,
 120     .instance_size = sizeof(ICH9SMBState),
 121     .class_init = ich9_smb_class_init,
 122 };
 123
 124 static void ich9_smb_register(void)
 125 {
 126     type_register_static(&ich9_smb_info);
 127 }
 128
 129 type_init(ich9_smb_register);