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qemu/hw/lpc_ich9.c
Laszlo Ersek 0e98b436ec ICH9 LPC: Reset Control Register, basic implementation 
This commit does the same for the ICH9 LPC as commit 1ec4ba74 for the
PIIX3. For the present we're ignoring the Full Reset (FULL_RST) and System
Reset (SYS_RST) bits; the guest can read them back but that's it.

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2013-02-27 17:23:22 +02:00

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/*
* QEMU ICH9 Emulation
*
* Copyright (c) 2006 Fabrice Bellard
* Copyright (c) 2009, 2010, 2011
* Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
* Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
*
* This is based on piix_pci.c, but heavily modified.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu-common.h"
#include "hw.h"
#include "qemu/range.h"
#include "isa.h"
#include "sysbus.h"
#include "pc.h"
#include "apm.h"
#include "ioapic.h"
#include "pci/pci.h"
#include "pci/pcie_host.h"
#include "pci/pci_bridge.h"
#include "ich9.h"
#include "acpi.h"
#include "acpi_ich9.h"
#include "pam.h"
#include "pci/pci_bus.h"
#include "exec/address-spaces.h"
#include "sysemu/sysemu.h"
static int ich9_lpc_sci_irq(ICH9LPCState *lpc);
/*****************************************************************************/
/* ICH9 LPC PCI to ISA bridge */
static void ich9_lpc_reset(DeviceState *qdev);
/* chipset configuration register
* to access chipset configuration registers, pci_[sg]et_{byte, word, long}
* are used.
* Although it's not pci configuration space, it's little endian as Intel.
*/
static void ich9_cc_update_ir(uint8_t irr[PCI_NUM_PINS], uint16_t ir)
{
int intx;
for (intx = 0; intx < PCI_NUM_PINS; intx++) {
irr[intx] = (ir >> (intx * ICH9_CC_DIR_SHIFT)) & ICH9_CC_DIR_MASK;
}
}
static void ich9_cc_update(ICH9LPCState *lpc)
{
int slot;
int pci_intx;
const int reg_offsets[] = {
ICH9_CC_D25IR,
ICH9_CC_D26IR,
ICH9_CC_D27IR,
ICH9_CC_D28IR,
ICH9_CC_D29IR,
ICH9_CC_D30IR,
ICH9_CC_D31IR,
};
const int *offset;
/* D{25 - 31}IR, but D30IR is read only to 0. */
for (slot = 25, offset = reg_offsets; slot < 32; slot++, offset++) {
if (slot == 30) {
continue;
}
ich9_cc_update_ir(lpc->irr[slot],
pci_get_word(lpc->chip_config + *offset));
}
/*
* D30: DMI2PCI bridge
* It is arbitrarily decided how INTx lines of PCI devicesbehind the bridge
* are connected to pirq lines. Our choice is PIRQ[E-H].
* INT[A-D] are connected to PIRQ[E-H]
*/
for (pci_intx = 0; pci_intx < PCI_NUM_PINS; pci_intx++) {
lpc->irr[30][pci_intx] = pci_intx + 4;
}
}
static void ich9_cc_init(ICH9LPCState *lpc)
{
int slot;
int intx;
/* the default irq routing is arbitrary as long as it matches with
* acpi irq routing table.
* The one that is incompatible with piix_pci(= bochs) one is
* intentionally chosen to let the users know that the different
* board is used.
*
* int[A-D] -> pirq[E-F]
* avoid pirq A-D because they are used for pci express port
*/
for (slot = 0; slot < PCI_SLOT_MAX; slot++) {
for (intx = 0; intx < PCI_NUM_PINS; intx++) {
lpc->irr[slot][intx] = (slot + intx) % 4 + 4;
}
}
ich9_cc_update(lpc);
}
static void ich9_cc_reset(ICH9LPCState *lpc)
{
uint8_t *c = lpc->chip_config;
memset(lpc->chip_config, 0, sizeof(lpc->chip_config));
pci_set_long(c + ICH9_CC_D31IR, ICH9_CC_DIR_DEFAULT);
pci_set_long(c + ICH9_CC_D30IR, ICH9_CC_D30IR_DEFAULT);
pci_set_long(c + ICH9_CC_D29IR, ICH9_CC_DIR_DEFAULT);
pci_set_long(c + ICH9_CC_D28IR, ICH9_CC_DIR_DEFAULT);
pci_set_long(c + ICH9_CC_D27IR, ICH9_CC_DIR_DEFAULT);
pci_set_long(c + ICH9_CC_D26IR, ICH9_CC_DIR_DEFAULT);
pci_set_long(c + ICH9_CC_D25IR, ICH9_CC_DIR_DEFAULT);
ich9_cc_update(lpc);
}
static void ich9_cc_addr_len(uint64_t *addr, unsigned *len)
{
*addr &= ICH9_CC_ADDR_MASK;
if (*addr + *len >= ICH9_CC_SIZE) {
*len = ICH9_CC_SIZE - *addr;
}
}
/* val: little endian */
static void ich9_cc_write(void *opaque, hwaddr addr,
uint64_t val, unsigned len)
{
ICH9LPCState *lpc = (ICH9LPCState *)opaque;
ich9_cc_addr_len(&addr, &len);
memcpy(lpc->chip_config + addr, &val, len);
pci_bus_fire_intx_routing_notifier(lpc->d.bus);
ich9_cc_update(lpc);
}
/* return value: little endian */
static uint64_t ich9_cc_read(void *opaque, hwaddr addr,
unsigned len)
{
ICH9LPCState *lpc = (ICH9LPCState *)opaque;
uint32_t val = 0;
ich9_cc_addr_len(&addr, &len);
memcpy(&val, lpc->chip_config + addr, len);
return val;
}
/* IRQ routing */
/* */
static void ich9_lpc_rout(uint8_t pirq_rout, int *pic_irq, int *pic_dis)
{
*pic_irq = pirq_rout & ICH9_LPC_PIRQ_ROUT_MASK;
*pic_dis = pirq_rout & ICH9_LPC_PIRQ_ROUT_IRQEN;
}
static void ich9_lpc_pic_irq(ICH9LPCState *lpc, int pirq_num,
int *pic_irq, int *pic_dis)
{
switch (pirq_num) {
case 0 ... 3: /* A-D */
ich9_lpc_rout(lpc->d.config[ICH9_LPC_PIRQA_ROUT + pirq_num],
pic_irq, pic_dis);
return;
case 4 ... 7: /* E-H */
ich9_lpc_rout(lpc->d.config[ICH9_LPC_PIRQE_ROUT + (pirq_num - 4)],
pic_irq, pic_dis);
return;
default:
break;
}
abort();
}
/* pic_irq: i8254 irq 0-15 */
static void ich9_lpc_update_pic(ICH9LPCState *lpc, int pic_irq)
{
int i, pic_level;
/* The pic level is the logical OR of all the PCI irqs mapped to it */
pic_level = 0;
for (i = 0; i < ICH9_LPC_NB_PIRQS; i++) {
int tmp_irq;
int tmp_dis;
ich9_lpc_pic_irq(lpc, i, &tmp_irq, &tmp_dis);
if (!tmp_dis && pic_irq == tmp_irq) {
pic_level |= pci_bus_get_irq_level(lpc->d.bus, i);
}
}
if (pic_irq == ich9_lpc_sci_irq(lpc)) {
pic_level |= lpc->sci_level;
}
qemu_set_irq(lpc->pic[pic_irq], pic_level);
}
/* pirq: pirq[A-H] 0-7*/
static void ich9_lpc_update_by_pirq(ICH9LPCState *lpc, int pirq)
{
int pic_irq;
int pic_dis;
ich9_lpc_pic_irq(lpc, pirq, &pic_irq, &pic_dis);
assert(pic_irq < ICH9_LPC_PIC_NUM_PINS);
if (pic_dis) {
return;
}
ich9_lpc_update_pic(lpc, pic_irq);
}
/* APIC mode: GSIx: PIRQ[A-H] -> GSI 16, ... no pirq shares same APIC pins. */
static int ich9_pirq_to_gsi(int pirq)
{
return pirq + ICH9_LPC_PIC_NUM_PINS;
}
static int ich9_gsi_to_pirq(int gsi)
{
return gsi - ICH9_LPC_PIC_NUM_PINS;
}
static void ich9_lpc_update_apic(ICH9LPCState *lpc, int gsi)
{
int level = 0;
if (gsi >= ICH9_LPC_PIC_NUM_PINS) {
level |= pci_bus_get_irq_level(lpc->d.bus, ich9_gsi_to_pirq(gsi));
}
if (gsi == ich9_lpc_sci_irq(lpc)) {
level |= lpc->sci_level;
}
qemu_set_irq(lpc->ioapic[gsi], level);
}
void ich9_lpc_set_irq(void *opaque, int pirq, int level)
{
ICH9LPCState *lpc = opaque;
assert(0 <= pirq);
assert(pirq < ICH9_LPC_NB_PIRQS);
ich9_lpc_update_apic(lpc, ich9_pirq_to_gsi(pirq));
ich9_lpc_update_by_pirq(lpc, pirq);
}
/* return the pirq number (PIRQ[A-H]:0-7) corresponding to
* a given device irq pin.
*/
int ich9_lpc_map_irq(PCIDevice *pci_dev, int intx)
{
BusState *bus = qdev_get_parent_bus(&pci_dev->qdev);
PCIBus *pci_bus = PCI_BUS(bus);
PCIDevice *lpc_pdev =
pci_bus->devices[PCI_DEVFN(ICH9_LPC_DEV, ICH9_LPC_FUNC)];
ICH9LPCState *lpc = ICH9_LPC_DEVICE(lpc_pdev);
return lpc->irr[PCI_SLOT(pci_dev->devfn)][intx];
}
PCIINTxRoute ich9_route_intx_pin_to_irq(void *opaque, int pirq_pin)
{
ICH9LPCState *lpc = opaque;
PCIINTxRoute route;
int pic_irq;
int pic_dis;
assert(0 <= pirq_pin);
assert(pirq_pin < ICH9_LPC_NB_PIRQS);
route.mode = PCI_INTX_ENABLED;
ich9_lpc_pic_irq(lpc, pirq_pin, &pic_irq, &pic_dis);
if (!pic_dis) {
if (pic_irq < ICH9_LPC_PIC_NUM_PINS) {
route.irq = pic_irq;
} else {
route.mode = PCI_INTX_DISABLED;
route.irq = -1;
}
} else {
route.irq = ich9_pirq_to_gsi(pirq_pin);
}
return route;
}
static int ich9_lpc_sci_irq(ICH9LPCState *lpc)
{
switch (lpc->d.config[ICH9_LPC_ACPI_CTRL] &
ICH9_LPC_ACPI_CTRL_SCI_IRQ_SEL_MASK) {
case ICH9_LPC_ACPI_CTRL_9:
return 9;
case ICH9_LPC_ACPI_CTRL_10:
return 10;
case ICH9_LPC_ACPI_CTRL_11:
return 11;
case ICH9_LPC_ACPI_CTRL_20:
return 20;
case ICH9_LPC_ACPI_CTRL_21:
return 21;
default:
/* reserved */
break;
}
return -1;
}
static void ich9_set_sci(void *opaque, int irq_num, int level)
{
ICH9LPCState *lpc = opaque;
int irq;
assert(irq_num == 0);
level = !!level;
if (level == lpc->sci_level) {
return;
}
lpc->sci_level = level;
irq = ich9_lpc_sci_irq(lpc);
if (irq < 0) {
return;
}
ich9_lpc_update_apic(lpc, irq);
if (irq < ICH9_LPC_PIC_NUM_PINS) {
ich9_lpc_update_pic(lpc, irq);
}
}
void ich9_lpc_pm_init(PCIDevice *lpc_pci, qemu_irq cmos_s3)
{
ICH9LPCState *lpc = ICH9_LPC_DEVICE(lpc_pci);
qemu_irq *sci_irq;
sci_irq = qemu_allocate_irqs(ich9_set_sci, lpc, 1);
ich9_pm_init(lpc_pci, &lpc->pm, sci_irq[0], cmos_s3);
ich9_lpc_reset(&lpc->d.qdev);
}
/* APM */
static void ich9_apm_ctrl_changed(uint32_t val, void *arg)
{
ICH9LPCState *lpc = arg;
/* ACPI specs 3.0, 4.7.2.5 */
acpi_pm1_cnt_update(&lpc->pm.acpi_regs,
val == ICH9_APM_ACPI_ENABLE,
val == ICH9_APM_ACPI_DISABLE);
/* SMI_EN = PMBASE + 30. SMI control and enable register */
if (lpc->pm.smi_en & ICH9_PMIO_SMI_EN_APMC_EN) {
cpu_interrupt(first_cpu, CPU_INTERRUPT_SMI);
}
}
/* config:PMBASE */
static void
ich9_lpc_pmbase_update(ICH9LPCState *lpc)
{
uint32_t pm_io_base = pci_get_long(lpc->d.config + ICH9_LPC_PMBASE);
pm_io_base &= ICH9_LPC_PMBASE_BASE_ADDRESS_MASK;
ich9_pm_iospace_update(&lpc->pm, pm_io_base);
}
/* config:RBCA */
static void ich9_lpc_rcba_update(ICH9LPCState *lpc, uint32_t rbca_old)
{
uint32_t rbca = pci_get_long(lpc->d.config + ICH9_LPC_RCBA);
if (rbca_old & ICH9_LPC_RCBA_EN) {
memory_region_del_subregion(get_system_memory(), &lpc->rbca_mem);
}
if (rbca & ICH9_LPC_RCBA_EN) {
memory_region_add_subregion_overlap(get_system_memory(),
rbca & ICH9_LPC_RCBA_BA_MASK,
&lpc->rbca_mem, 1);
}
}
static int ich9_lpc_post_load(void *opaque, int version_id)
{
ICH9LPCState *lpc = opaque;
ich9_lpc_pmbase_update(lpc);
ich9_lpc_rcba_update(lpc, 0 /* disabled ICH9_LPC_RBCA_EN */);
return 0;
}
static void ich9_lpc_config_write(PCIDevice *d,
uint32_t addr, uint32_t val, int len)
{
ICH9LPCState *lpc = ICH9_LPC_DEVICE(d);
uint32_t rbca_old = pci_get_long(d->config + ICH9_LPC_RCBA);
pci_default_write_config(d, addr, val, len);
if (ranges_overlap(addr, len, ICH9_LPC_PMBASE, 4)) {
ich9_lpc_pmbase_update(lpc);
}
if (ranges_overlap(addr, len, ICH9_LPC_RCBA, 4)) {
ich9_lpc_rcba_update(lpc, rbca_old);
}
if (ranges_overlap(addr, len, ICH9_LPC_PIRQA_ROUT, 4)) {
pci_bus_fire_intx_routing_notifier(lpc->d.bus);
}
if (ranges_overlap(addr, len, ICH9_LPC_PIRQE_ROUT, 4)) {
pci_bus_fire_intx_routing_notifier(lpc->d.bus);
}
}
static void ich9_lpc_reset(DeviceState *qdev)
{
PCIDevice *d = PCI_DEVICE(qdev);
ICH9LPCState *lpc = ICH9_LPC_DEVICE(d);
uint32_t rbca_old = pci_get_long(d->config + ICH9_LPC_RCBA);
int i;
for (i = 0; i < 4; i++) {
pci_set_byte(d->config + ICH9_LPC_PIRQA_ROUT + i,
ICH9_LPC_PIRQ_ROUT_DEFAULT);
}
for (i = 0; i < 4; i++) {
pci_set_byte(d->config + ICH9_LPC_PIRQE_ROUT + i,
ICH9_LPC_PIRQ_ROUT_DEFAULT);
}
pci_set_byte(d->config + ICH9_LPC_ACPI_CTRL, ICH9_LPC_ACPI_CTRL_DEFAULT);
pci_set_long(d->config + ICH9_LPC_PMBASE, ICH9_LPC_PMBASE_DEFAULT);
pci_set_long(d->config + ICH9_LPC_RCBA, ICH9_LPC_RCBA_DEFAULT);
ich9_cc_reset(lpc);
ich9_lpc_pmbase_update(lpc);
ich9_lpc_rcba_update(lpc, rbca_old);
lpc->sci_level = 0;
lpc->rst_cnt = 0;
}
static const MemoryRegionOps rbca_mmio_ops = {
.read = ich9_cc_read,
.write = ich9_cc_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void ich9_lpc_machine_ready(Notifier *n, void *opaque)
{
ICH9LPCState *s = container_of(n, ICH9LPCState, machine_ready);
uint8_t *pci_conf;
pci_conf = s->d.config;
if (isa_is_ioport_assigned(0x3f8)) {
/* com1 */
pci_conf[0x82] |= 0x01;
}
if (isa_is_ioport_assigned(0x2f8)) {
/* com2 */
pci_conf[0x82] |= 0x02;
}
if (isa_is_ioport_assigned(0x378)) {
/* lpt */
pci_conf[0x82] |= 0x04;
}
if (isa_is_ioport_assigned(0x3f0)) {
/* floppy */
pci_conf[0x82] |= 0x08;
}
}
/* reset control */
static void ich9_rst_cnt_write(void *opaque, hwaddr addr, uint64_t val,
unsigned len)
{
ICH9LPCState *lpc = opaque;
if (val & 4) {
qemu_system_reset_request();
return;
}
lpc->rst_cnt = val & 0xA; /* keep FULL_RST (bit 3) and SYS_RST (bit 1) */
}
static uint64_t ich9_rst_cnt_read(void *opaque, hwaddr addr, unsigned len)
{
ICH9LPCState *lpc = opaque;
return lpc->rst_cnt;
}
static const MemoryRegionOps ich9_rst_cnt_ops = {
.read = ich9_rst_cnt_read,
.write = ich9_rst_cnt_write,
.endianness = DEVICE_LITTLE_ENDIAN
};
static int ich9_lpc_initfn(PCIDevice *d)
{
ICH9LPCState *lpc = ICH9_LPC_DEVICE(d);
ISABus *isa_bus;
isa_bus = isa_bus_new(&d->qdev, get_system_io());
pci_set_long(d->wmask + ICH9_LPC_PMBASE,
ICH9_LPC_PMBASE_BASE_ADDRESS_MASK);
memory_region_init_io(&lpc->rbca_mem, &rbca_mmio_ops, lpc,
"lpc-rbca-mmio", ICH9_CC_SIZE);
lpc->isa_bus = isa_bus;
ich9_cc_init(lpc);
apm_init(d, &lpc->apm, ich9_apm_ctrl_changed, lpc);
lpc->machine_ready.notify = ich9_lpc_machine_ready;
qemu_add_machine_init_done_notifier(&lpc->machine_ready);
memory_region_init_io(&lpc->rst_cnt_mem, &ich9_rst_cnt_ops, lpc,
"lpc-reset-control", 1);
memory_region_add_subregion_overlap(pci_address_space_io(d),
ICH9_RST_CNT_IOPORT, &lpc->rst_cnt_mem,
1);
return 0;
}
static bool ich9_rst_cnt_needed(void *opaque)
{
ICH9LPCState *lpc = opaque;
return (lpc->rst_cnt != 0);
}
static const VMStateDescription vmstate_ich9_rst_cnt = {
.name = "ICH9LPC/rst_cnt",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT8(rst_cnt, ICH9LPCState),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_ich9_lpc = {
.name = "ICH9LPC",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.post_load = ich9_lpc_post_load,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(d, ICH9LPCState),
VMSTATE_STRUCT(apm, ICH9LPCState, 0, vmstate_apm, APMState),
VMSTATE_STRUCT(pm, ICH9LPCState, 0, vmstate_ich9_pm, ICH9LPCPMRegs),
VMSTATE_UINT8_ARRAY(chip_config, ICH9LPCState, ICH9_CC_SIZE),
VMSTATE_UINT32(sci_level, ICH9LPCState),
VMSTATE_END_OF_LIST()
},
.subsections = (VMStateSubsection[]) {
{
.vmsd = &vmstate_ich9_rst_cnt,
.needed = ich9_rst_cnt_needed
},
{ 0 }
}
};
static void ich9_lpc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
dc->reset = ich9_lpc_reset;
k->init = ich9_lpc_initfn;
dc->vmsd = &vmstate_ich9_lpc;
dc->no_user = 1;
k->config_write = ich9_lpc_config_write;
dc->desc = "ICH9 LPC bridge";
k->vendor_id = PCI_VENDOR_ID_INTEL;
k->device_id = PCI_DEVICE_ID_INTEL_ICH9_8;
k->revision = ICH9_A2_LPC_REVISION;
k->class_id = PCI_CLASS_BRIDGE_ISA;
}
static const TypeInfo ich9_lpc_info = {
.name = TYPE_ICH9_LPC_DEVICE,
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(struct ICH9LPCState),
.class_init = ich9_lpc_class_init,
};
static void ich9_lpc_register(void)
{
type_register_static(&ich9_lpc_info);
}
type_init(ich9_lpc_register);
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