2 * QEMU ICH9 TCO emulation
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
9 #include "qemu/osdep.h"
10 #include "qemu-common.h"
11 #include "sysemu/watchdog.h"
12 #include "hw/i386/ich9.h"
14 #include "hw/acpi/tco.h"
19 #define TCO_DEBUG(fmt, ...) \
21 fprintf(stderr, "%s "fmt, __func__, ## __VA_ARGS__); \
24 #define TCO_DEBUG(fmt, ...) do { } while (0)
28 TCO_RLD_DEFAULT = 0x0000,
29 TCO_DAT_IN_DEFAULT = 0x00,
30 TCO_DAT_OUT_DEFAULT = 0x00,
31 TCO1_STS_DEFAULT = 0x0000,
32 TCO2_STS_DEFAULT = 0x0000,
33 TCO1_CNT_DEFAULT = 0x0000,
34 TCO2_CNT_DEFAULT = 0x0008,
35 TCO_MESSAGE1_DEFAULT = 0x00,
36 TCO_MESSAGE2_DEFAULT = 0x00,
37 TCO_WDCNT_DEFAULT = 0x00,
38 TCO_TMR_DEFAULT = 0x0004,
39 SW_IRQ_GEN_DEFAULT = 0x03,
42 static inline void tco_timer_reload(TCOIORegs *tr)
44 tr->expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
45 ((int64_t)(tr->tco.tmr & TCO_TMR_MASK) * TCO_TICK_NSEC);
46 timer_mod(tr->tco_timer, tr->expire_time);
49 static inline void tco_timer_stop(TCOIORegs *tr)
52 timer_del(tr->tco_timer);
55 static void tco_timer_expired(void *opaque)
57 TCOIORegs *tr = opaque;
58 ICH9LPCPMRegs *pm = container_of(tr, ICH9LPCPMRegs, tco_regs);
59 ICH9LPCState *lpc = container_of(pm, ICH9LPCState, pm);
60 uint32_t gcs = pci_get_long(lpc->chip_config + ICH9_CC_GCS);
63 tr->tco.sts1 |= TCO_TIMEOUT;
64 if (++tr->timeouts_no == 2) {
65 tr->tco.sts2 |= TCO_SECOND_TO_STS;
66 tr->tco.sts2 |= TCO_BOOT_STS;
69 if (!lpc->pin_strap.spkr_hi && !(gcs & ICH9_CC_GCS_NO_REBOOT)) {
70 watchdog_perform_action();
76 if (pm->smi_en & ICH9_PMIO_SMI_EN_TCO_EN) {
79 tr->tco.rld = tr->tco.tmr;
83 /* NOTE: values of 0 or 1 will be ignored by ICH */
84 static inline int can_start_tco_timer(TCOIORegs *tr)
86 return !(tr->tco.cnt1 & TCO_TMR_HLT) && tr->tco.tmr > 1;
89 static uint32_t tco_ioport_readw(TCOIORegs *tr, uint32_t addr)
95 if (tr->expire_time != -1) {
96 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
97 int64_t elapsed = (tr->expire_time - now) / TCO_TICK_NSEC;
98 rld = (uint16_t)elapsed | (tr->tco.rld & ~TCO_RLD_MASK);
120 return tr->tco.wdcnt;
124 return tr->sw_irq_gen;
129 static void tco_ioport_writew(TCOIORegs *tr, uint32_t addr, uint32_t val)
134 if (can_start_tco_timer(tr)) {
135 tr->tco.rld = tr->tco.tmr;
136 tco_timer_reload(tr);
143 tr->tco.sts1 |= SW_TCO_SMI;
148 tr->tco.sts1 |= TCO_INT_STS;
149 /* TODO: cause an interrupt, as selected by the TCO_INT_SEL bits */
152 tr->tco.sts1 = val & TCO1_STS_MASK;
155 tr->tco.sts2 = val & TCO2_STS_MASK;
158 val &= TCO1_CNT_MASK;
160 * once TCO_LOCK bit is set, it can not be cleared by software. a reset
161 * is required to change this bit from 1 to 0 -- it defaults to 0.
163 tr->tco.cnt1 = val | (tr->tco.cnt1 & TCO_LOCK);
164 if (can_start_tco_timer(tr)) {
165 tr->tco.rld = tr->tco.tmr;
166 tco_timer_reload(tr);
187 tr->sw_irq_gen = val;
192 static uint64_t tco_io_readw(void *opaque, hwaddr addr, unsigned width)
194 TCOIORegs *tr = opaque;
195 return tco_ioport_readw(tr, addr);
198 static void tco_io_writew(void *opaque, hwaddr addr, uint64_t val,
201 TCOIORegs *tr = opaque;
202 tco_ioport_writew(tr, addr, val);
205 static const MemoryRegionOps tco_io_ops = {
206 .read = tco_io_readw,
207 .write = tco_io_writew,
208 .valid.min_access_size = 1,
209 .valid.max_access_size = 4,
210 .impl.min_access_size = 1,
211 .impl.max_access_size = 2,
212 .endianness = DEVICE_LITTLE_ENDIAN,
215 void acpi_pm_tco_init(TCOIORegs *tr, MemoryRegion *parent)
219 .rld = TCO_RLD_DEFAULT,
220 .din = TCO_DAT_IN_DEFAULT,
221 .dout = TCO_DAT_OUT_DEFAULT,
222 .sts1 = TCO1_STS_DEFAULT,
223 .sts2 = TCO2_STS_DEFAULT,
224 .cnt1 = TCO1_CNT_DEFAULT,
225 .cnt2 = TCO2_CNT_DEFAULT,
226 .msg1 = TCO_MESSAGE1_DEFAULT,
227 .msg2 = TCO_MESSAGE2_DEFAULT,
228 .wdcnt = TCO_WDCNT_DEFAULT,
229 .tmr = TCO_TMR_DEFAULT,
231 .sw_irq_gen = SW_IRQ_GEN_DEFAULT,
232 .tco_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, tco_timer_expired, tr),
236 memory_region_init_io(&tr->io, memory_region_owner(parent),
237 &tco_io_ops, tr, "sm-tco", ICH9_PMIO_TCO_LEN);
238 memory_region_add_subregion(parent, ICH9_PMIO_TCO_RLD, &tr->io);
241 const VMStateDescription vmstate_tco_io_sts = {
242 .name = "tco io device status",
244 .minimum_version_id = 1,
245 .minimum_version_id_old = 1,
246 .fields = (VMStateField[]) {
247 VMSTATE_UINT16(tco.rld, TCOIORegs),
248 VMSTATE_UINT8(tco.din, TCOIORegs),
249 VMSTATE_UINT8(tco.dout, TCOIORegs),
250 VMSTATE_UINT16(tco.sts1, TCOIORegs),
251 VMSTATE_UINT16(tco.sts2, TCOIORegs),
252 VMSTATE_UINT16(tco.cnt1, TCOIORegs),
253 VMSTATE_UINT16(tco.cnt2, TCOIORegs),
254 VMSTATE_UINT8(tco.msg1, TCOIORegs),
255 VMSTATE_UINT8(tco.msg2, TCOIORegs),
256 VMSTATE_UINT8(tco.wdcnt, TCOIORegs),
257 VMSTATE_UINT16(tco.tmr, TCOIORegs),
258 VMSTATE_UINT8(sw_irq_gen, TCOIORegs),
259 VMSTATE_TIMER_PTR(tco_timer, TCOIORegs),
260 VMSTATE_INT64(expire_time, TCOIORegs),
261 VMSTATE_UINT8(timeouts_no, TCOIORegs),
262 VMSTATE_END_OF_LIST()