/*
* QEMU ICH9 TCO emulation
*
* Copyright (c) 2015 Paulo Alcantara <pcacjr@zytor.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "sysemu/watchdog.h"
#include "hw/i386/ich9.h"
#include "hw/acpi/tco.h"
//#define DEBUG
#ifdef DEBUG
#define TCO_DEBUG(fmt, ...) \
do { \
fprintf(stderr, "%s "fmt, __func__, ## __VA_ARGS__); \
} while (0)
#else
#define TCO_DEBUG(fmt, ...) do { } while (0)
#endif
enum {
TCO_RLD_DEFAULT = 0x0000,
TCO_DAT_IN_DEFAULT = 0x00,
TCO_DAT_OUT_DEFAULT = 0x00,
TCO1_STS_DEFAULT = 0x0000,
TCO2_STS_DEFAULT = 0x0000,
TCO1_CNT_DEFAULT = 0x0000,
TCO2_CNT_DEFAULT = 0x0008,
TCO_MESSAGE1_DEFAULT = 0x00,
TCO_MESSAGE2_DEFAULT = 0x00,
TCO_WDCNT_DEFAULT = 0x00,
TCO_TMR_DEFAULT = 0x0004,
SW_IRQ_GEN_DEFAULT = 0x03,
};
static inline void tco_timer_reload(TCOIORegs *tr)
{
tr->expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
((int64_t)(tr->tco.tmr & TCO_TMR_MASK) * TCO_TICK_NSEC);
timer_mod(tr->tco_timer, tr->expire_time);
}
static inline void tco_timer_stop(TCOIORegs *tr)
{
tr->expire_time = -1;
}
static void tco_timer_expired(void *opaque)
{
TCOIORegs *tr = opaque;
ICH9LPCPMRegs *pm = container_of(tr, ICH9LPCPMRegs, tco_regs);
ICH9LPCState *lpc = container_of(pm, ICH9LPCState, pm);
uint32_t gcs = pci_get_long(lpc->chip_config + ICH9_CC_GCS);
tr->tco.rld = 0;
tr->tco.sts1 |= TCO_TIMEOUT;
if (++tr->timeouts_no == 2) {
tr->tco.sts2 |= TCO_SECOND_TO_STS;
tr->tco.sts2 |= TCO_BOOT_STS;
tr->timeouts_no = 0;
if (!lpc->pin_strap.spkr_hi && !(gcs & ICH9_CC_GCS_NO_REBOOT)) {
watchdog_perform_action();
tco_timer_stop(tr);
return;
}
}
if (pm->smi_en & ICH9_PMIO_SMI_EN_TCO_EN) {
ich9_generate_smi();
} else {
ich9_generate_nmi();
}
tr->tco.rld = tr->tco.tmr;
tco_timer_reload(tr);
}
/* NOTE: values of 0 or 1 will be ignored by ICH */
static inline int can_start_tco_timer(TCOIORegs *tr)
{
return !(tr->tco.cnt1 & TCO_TMR_HLT) && tr->tco.tmr > 1;
}
static uint32_t tco_ioport_readw(TCOIORegs *tr, uint32_t addr)
{
uint16_t rld;
switch (addr) {
case TCO_RLD:
if (tr->expire_time != -1) {
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
int64_t elapsed = (tr->expire_time - now) / TCO_TICK_NSEC;
rld = (uint16_t)elapsed | (tr->tco.rld & ~TCO_RLD_MASK);
} else {
rld = tr->tco.rld;
}
return rld;
case TCO_DAT_IN:
return tr->tco.din;
case TCO_DAT_OUT:
return tr->tco.dout;
case TCO1_STS:
return tr->tco.sts1;
case TCO2_STS:
return tr->tco.sts2;
case TCO1_CNT:
return tr->tco.cnt1;
case TCO2_CNT:
return tr->tco.cnt2;
case TCO_MESSAGE1:
return tr->tco.msg1;
case TCO_MESSAGE2:
return tr->tco.msg2;
case TCO_WDCNT:
return tr->tco.wdcnt;
case TCO_TMR:
return tr->tco.tmr;
case SW_IRQ_GEN:
return tr->sw_irq_gen;
}
return 0;
}
static void tco_ioport_writew(TCOIORegs *tr, uint32_t addr, uint32_t val)
{
switch (addr) {
case TCO_RLD:
tr->timeouts_no = 0;
if (can_start_tco_timer(tr)) {
tr->tco.rld = tr->tco.tmr;
tco_timer_reload(tr);
} else {
tr->tco.rld = val;
}
break;
case TCO_DAT_IN:
tr->tco.din = val;
tr->tco.sts1 |= SW_TCO_SMI;
ich9_generate_smi();
break;
case TCO_DAT_OUT:
tr->tco.dout = val;
tr->tco.sts1 |= TCO_INT_STS;
/* TODO: cause an interrupt, as selected by the TCO_INT_SEL bits */
break;
case TCO1_STS:
tr->tco.sts1 = val & TCO1_STS_MASK;
break;
case TCO2_STS:
tr->tco.sts2 = val & TCO2_STS_MASK;
break;
case TCO1_CNT:
val &= TCO1_CNT_MASK;
/*
* once TCO_LOCK bit is set, it can not be cleared by software. a reset
* is required to change this bit from 1 to 0 -- it defaults to 0.
*/
tr->tco.cnt1 = val | (tr->tco.cnt1 & TCO_LOCK);
if (can_start_tco_timer(tr)) {
tr->tco.rld = tr->tco.tmr;
tco_timer_reload(tr);
} else {
tco_timer_stop(tr);
}
break;
case TCO2_CNT:
tr->tco.cnt2 = val;
break;
case TCO_MESSAGE1:
tr->tco.msg1 = val;
break;
case TCO_MESSAGE2:
tr->tco.msg2 = val;
break;
case TCO_WDCNT:
tr->tco.wdcnt = val;
break;
case TCO_TMR:
tr->tco.tmr = val;
break;
case SW_IRQ_GEN:
tr->sw_irq_gen = val;
break;
}
}
static uint64_t tco_io_readw(void *opaque, hwaddr addr, unsigned width)
{
TCOIORegs *tr = opaque;
return tco_ioport_readw(tr, addr);
}
static void tco_io_writew(void *opaque, hwaddr addr, uint64_t val,
unsigned width)
{
TCOIORegs *tr = opaque;
tco_ioport_writew(tr, addr, val);
}
static const MemoryRegionOps tco_io_ops = {
.read = tco_io_readw,
.write = tco_io_writew,
.valid.min_access_size = 1,
.valid.max_access_size = 4,
.impl.min_access_size = 1,
.impl.max_access_size = 2,
.endianness = DEVICE_LITTLE_ENDIAN,
};
void acpi_pm_tco_init(TCOIORegs *tr, MemoryRegion *parent)
{
*tr = (TCOIORegs) {
.tco = {
.rld = TCO_RLD_DEFAULT,
.din = TCO_DAT_IN_DEFAULT,
.dout = TCO_DAT_OUT_DEFAULT,
.sts1 = TCO1_STS_DEFAULT,
.sts2 = TCO2_STS_DEFAULT,
.cnt1 = TCO1_CNT_DEFAULT,
.cnt2 = TCO2_CNT_DEFAULT,
.msg1 = TCO_MESSAGE1_DEFAULT,
.msg2 = TCO_MESSAGE2_DEFAULT,
.wdcnt = TCO_WDCNT_DEFAULT,
.tmr = TCO_TMR_DEFAULT,
},
.sw_irq_gen = SW_IRQ_GEN_DEFAULT,
.tco_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, tco_timer_expired, tr),
.expire_time = -1,
.timeouts_no = 0,
};
memory_region_init_io(&tr->io, memory_region_owner(parent),
&tco_io_ops, tr, "sm-tco", ICH9_PMIO_TCO_LEN);
memory_region_add_subregion(parent, ICH9_PMIO_TCO_RLD, &tr->io);
}
const VMStateDescription vmstate_tco_io_sts = {
.name = "tco io device status",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT16(tco.rld, TCOIORegs),
VMSTATE_UINT8(tco.din, TCOIORegs),
VMSTATE_UINT8(tco.dout, TCOIORegs),
VMSTATE_UINT16(tco.sts1, TCOIORegs),
VMSTATE_UINT16(tco.sts2, TCOIORegs),
VMSTATE_UINT16(tco.cnt1, TCOIORegs),
VMSTATE_UINT16(tco.cnt2, TCOIORegs),
VMSTATE_UINT8(tco.msg1, TCOIORegs),
VMSTATE_UINT8(tco.msg2, TCOIORegs),
VMSTATE_UINT8(tco.wdcnt, TCOIORegs),
VMSTATE_UINT16(tco.tmr, TCOIORegs),
VMSTATE_UINT8(sw_irq_gen, TCOIORegs),
VMSTATE_TIMER_PTR(tco_timer, TCOIORegs),
VMSTATE_INT64(expire_time, TCOIORegs),
VMSTATE_UINT8(timeouts_no, TCOIORegs),
VMSTATE_END_OF_LIST()
}
};
