diff options
Diffstat (limited to 'hw/acpi/tco.c')
| -rw-r--r-- | hw/acpi/tco.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/hw/acpi/tco.c b/hw/acpi/tco.c new file mode 100644 index 0000000000..1794a54545 --- /dev/null +++ b/hw/acpi/tco.c @@ -0,0 +1,264 @@ +/* + * 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-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 (!(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() + } +}; |