LXR qemu/hw/i2c/smbus

   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
  41typedef struct ICH9SMBState {
  42    PCIDevice dev;
  43
  44    PMSMBus smb;
  45} ICH9SMBState;
  46
  47static 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
  57static 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
  74static 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
  89static 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->cannot_instantiate_with_device_add_yet = true;
 107}
 108
 109I2CBus *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
 117static 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
 124static void ich9_smb_register(void)
 125{
 126    type_register_static(&ich9_smb_info);
 127}
 128
 129type_init(ich9_smb_register);
 130