1 /*
2 * QEMU ICH9 TCO emulation
3 *
4 * Copyright (c) 2015 Paulo Alcantara <pcacjr@zytor.com>
5 *
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.
8 */
9
10 #include "qemu/osdep.h"
11 #include "sysemu/watchdog.h"
12 #include "hw/i386/ich9.h"
13 #include "migration/vmstate.h"
14
15 #include "hw/acpi/tco.h"
16 #include "trace.h"
17
18 enum {
19 TCO_RLD_DEFAULT = 0x0000,
20 TCO_DAT_IN_DEFAULT = 0x00,
21 TCO_DAT_OUT_DEFAULT = 0x00,
22 TCO1_STS_DEFAULT = 0x0000,
23 TCO2_STS_DEFAULT = 0x0000,
24 TCO1_CNT_DEFAULT = 0x0000,
25 TCO2_CNT_DEFAULT = 0x0008,
26 TCO_MESSAGE1_DEFAULT = 0x00,
27 TCO_MESSAGE2_DEFAULT = 0x00,
28 TCO_WDCNT_DEFAULT = 0x00,
29 TCO_TMR_DEFAULT = 0x0004,
30 SW_IRQ_GEN_DEFAULT = 0x03,
31 };
32
tco_timer_reload(TCOIORegs * tr)33 static inline void tco_timer_reload(TCOIORegs *tr)
34 {
35 int ticks = tr->tco.tmr & TCO_TMR_MASK;
36 int64_t nsec = (int64_t)ticks * TCO_TICK_NSEC;
37
38 trace_tco_timer_reload(ticks, nsec / 1000000);
39 tr->expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + nsec;
40 timer_mod(tr->tco_timer, tr->expire_time);
41 }
42
tco_timer_stop(TCOIORegs * tr)43 static inline void tco_timer_stop(TCOIORegs *tr)
44 {
45 tr->expire_time = -1;
46 timer_del(tr->tco_timer);
47 }
48
tco_timer_expired(void * opaque)49 static void tco_timer_expired(void *opaque)
50 {
51 TCOIORegs *tr = opaque;
52 ICH9LPCPMRegs *pm = container_of(tr, ICH9LPCPMRegs, tco_regs);
53 ICH9LPCState *lpc = container_of(pm, ICH9LPCState, pm);
54 uint32_t gcs = pci_get_long(lpc->chip_config + ICH9_CC_GCS);
55
56 trace_tco_timer_expired(tr->timeouts_no,
57 lpc->pin_strap.spkr_hi,
58 !!(gcs & ICH9_CC_GCS_NO_REBOOT));
59 tr->tco.rld = 0;
60 tr->tco.sts1 |= TCO_TIMEOUT;
61 if (++tr->timeouts_no == 2) {
62 tr->tco.sts2 |= TCO_SECOND_TO_STS;
63 tr->tco.sts2 |= TCO_BOOT_STS;
64 tr->timeouts_no = 0;
65
66 if (!lpc->pin_strap.spkr_hi && !(gcs & ICH9_CC_GCS_NO_REBOOT)) {
67 watchdog_perform_action();
68 tco_timer_stop(tr);
69 return;
70 }
71 }
72
73 if (pm->smi_en & ICH9_PMIO_SMI_EN_TCO_EN) {
74 ich9_generate_smi();
75 }
76 tr->tco.rld = tr->tco.tmr;
77 tco_timer_reload(tr);
78 }
79
80 /* NOTE: values of 0 or 1 will be ignored by ICH */
can_start_tco_timer(TCOIORegs * tr)81 static inline int can_start_tco_timer(TCOIORegs *tr)
82 {
83 return !(tr->tco.cnt1 & TCO_TMR_HLT) && tr->tco.tmr > 1;
84 }
85
tco_ioport_readw(TCOIORegs * tr,uint32_t addr)86 static uint32_t tco_ioport_readw(TCOIORegs *tr, uint32_t addr)
87 {
88 uint16_t rld;
89
90 switch (addr) {
91 case TCO_RLD:
92 if (tr->expire_time != -1) {
93 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
94 int64_t elapsed = (tr->expire_time - now) / TCO_TICK_NSEC;
95 rld = (uint16_t)elapsed | (tr->tco.rld & ~TCO_RLD_MASK);
96 } else {
97 rld = tr->tco.rld;
98 }
99 return rld;
100 case TCO_DAT_IN:
101 return tr->tco.din;
102 case TCO_DAT_OUT:
103 return tr->tco.dout;
104 case TCO1_STS:
105 return tr->tco.sts1;
106 case TCO2_STS:
107 return tr->tco.sts2;
108 case TCO1_CNT:
109 return tr->tco.cnt1;
110 case TCO2_CNT:
111 return tr->tco.cnt2;
112 case TCO_MESSAGE1:
113 return tr->tco.msg1;
114 case TCO_MESSAGE2:
115 return tr->tco.msg2;
116 case TCO_WDCNT:
117 return tr->tco.wdcnt;
118 case TCO_TMR:
119 return tr->tco.tmr;
120 case SW_IRQ_GEN:
121 return tr->sw_irq_gen;
122 }
123 return 0;
124 }
125
tco_ioport_writew(TCOIORegs * tr,uint32_t addr,uint32_t val)126 static void tco_ioport_writew(TCOIORegs *tr, uint32_t addr, uint32_t val)
127 {
128 switch (addr) {
129 case TCO_RLD:
130 tr->timeouts_no = 0;
131 if (can_start_tco_timer(tr)) {
132 tr->tco.rld = tr->tco.tmr;
133 tco_timer_reload(tr);
134 } else {
135 tr->tco.rld = val;
136 }
137 break;
138 case TCO_DAT_IN:
139 tr->tco.din = val;
140 tr->tco.sts1 |= SW_TCO_SMI;
141 ich9_generate_smi();
142 break;
143 case TCO_DAT_OUT:
144 tr->tco.dout = val;
145 tr->tco.sts1 |= TCO_INT_STS;
146 /* TODO: cause an interrupt, as selected by the TCO_INT_SEL bits */
147 break;
148 case TCO1_STS:
149 tr->tco.sts1 = val & TCO1_STS_MASK;
150 break;
151 case TCO2_STS:
152 tr->tco.sts2 = val & TCO2_STS_MASK;
153 break;
154 case TCO1_CNT:
155 val &= TCO1_CNT_MASK;
156 /*
157 * once TCO_LOCK bit is set, it can not be cleared by software. a reset
158 * is required to change this bit from 1 to 0 -- it defaults to 0.
159 */
160 tr->tco.cnt1 = val | (tr->tco.cnt1 & TCO_LOCK);
161 if (can_start_tco_timer(tr)) {
162 tr->tco.rld = tr->tco.tmr;
163 tco_timer_reload(tr);
164 } else {
165 tco_timer_stop(tr);
166 }
167 break;
168 case TCO2_CNT:
169 tr->tco.cnt2 = val;
170 break;
171 case TCO_MESSAGE1:
172 tr->tco.msg1 = val;
173 break;
174 case TCO_MESSAGE2:
175 tr->tco.msg2 = val;
176 break;
177 case TCO_WDCNT:
178 tr->tco.wdcnt = val;
179 break;
180 case TCO_TMR:
181 tr->tco.tmr = val;
182 break;
183 case SW_IRQ_GEN:
184 tr->sw_irq_gen = val;
185 break;
186 }
187 }
188
tco_io_readw(void * opaque,hwaddr addr,unsigned width)189 static uint64_t tco_io_readw(void *opaque, hwaddr addr, unsigned width)
190 {
191 TCOIORegs *tr = opaque;
192 return tco_ioport_readw(tr, addr);
193 }
194
tco_io_writew(void * opaque,hwaddr addr,uint64_t val,unsigned width)195 static void tco_io_writew(void *opaque, hwaddr addr, uint64_t val,
196 unsigned width)
197 {
198 TCOIORegs *tr = opaque;
199 tco_ioport_writew(tr, addr, val);
200 }
201
202 static const MemoryRegionOps tco_io_ops = {
203 .read = tco_io_readw,
204 .write = tco_io_writew,
205 .valid.min_access_size = 1,
206 .valid.max_access_size = 4,
207 .impl.min_access_size = 1,
208 .impl.max_access_size = 2,
209 .endianness = DEVICE_LITTLE_ENDIAN,
210 };
211
acpi_pm_tco_init(TCOIORegs * tr,MemoryRegion * parent)212 void acpi_pm_tco_init(TCOIORegs *tr, MemoryRegion *parent)
213 {
214 *tr = (TCOIORegs) {
215 .tco = {
216 .rld = TCO_RLD_DEFAULT,
217 .din = TCO_DAT_IN_DEFAULT,
218 .dout = TCO_DAT_OUT_DEFAULT,
219 .sts1 = TCO1_STS_DEFAULT,
220 .sts2 = TCO2_STS_DEFAULT,
221 .cnt1 = TCO1_CNT_DEFAULT,
222 .cnt2 = TCO2_CNT_DEFAULT,
223 .msg1 = TCO_MESSAGE1_DEFAULT,
224 .msg2 = TCO_MESSAGE2_DEFAULT,
225 .wdcnt = TCO_WDCNT_DEFAULT,
226 .tmr = TCO_TMR_DEFAULT,
227 },
228 .sw_irq_gen = SW_IRQ_GEN_DEFAULT,
229 .tco_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, tco_timer_expired, tr),
230 .expire_time = -1,
231 .timeouts_no = 0,
232 };
233 memory_region_init_io(&tr->io, memory_region_owner(parent),
234 &tco_io_ops, tr, "sm-tco", ICH9_PMIO_TCO_LEN);
235 memory_region_add_subregion(parent, ICH9_PMIO_TCO_RLD, &tr->io);
236 }
237
238 const VMStateDescription vmstate_tco_io_sts = {
239 .name = "tco io device status",
240 .version_id = 1,
241 .minimum_version_id = 1,
242 .minimum_version_id_old = 1,
243 .fields = (VMStateField[]) {
244 VMSTATE_UINT16(tco.rld, TCOIORegs),
245 VMSTATE_UINT8(tco.din, TCOIORegs),
246 VMSTATE_UINT8(tco.dout, TCOIORegs),
247 VMSTATE_UINT16(tco.sts1, TCOIORegs),
248 VMSTATE_UINT16(tco.sts2, TCOIORegs),
249 VMSTATE_UINT16(tco.cnt1, TCOIORegs),
250 VMSTATE_UINT16(tco.cnt2, TCOIORegs),
251 VMSTATE_UINT8(tco.msg1, TCOIORegs),
252 VMSTATE_UINT8(tco.msg2, TCOIORegs),
253 VMSTATE_UINT8(tco.wdcnt, TCOIORegs),
254 VMSTATE_UINT16(tco.tmr, TCOIORegs),
255 VMSTATE_UINT8(sw_irq_gen, TCOIORegs),
256 VMSTATE_TIMER_PTR(tco_timer, TCOIORegs),
257 VMSTATE_INT64(expire_time, TCOIORegs),
258 VMSTATE_UINT8(timeouts_no, TCOIORegs),
259 VMSTATE_END_OF_LIST()
260 }
261 };
262