tco.c (7514B)
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 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 43 static inline void tco_timer_stop(TCOIORegs *tr) 44 { 45 tr->expire_time = -1; 46 timer_del(tr->tco_timer); 47 } 48 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 */ 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 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 } 125 126 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 } 188 189 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 } 194 195 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 }; 211 212 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 .fields = (VMStateField[]) { 243 VMSTATE_UINT16(tco.rld, TCOIORegs), 244 VMSTATE_UINT8(tco.din, TCOIORegs), 245 VMSTATE_UINT8(tco.dout, TCOIORegs), 246 VMSTATE_UINT16(tco.sts1, TCOIORegs), 247 VMSTATE_UINT16(tco.sts2, TCOIORegs), 248 VMSTATE_UINT16(tco.cnt1, TCOIORegs), 249 VMSTATE_UINT16(tco.cnt2, TCOIORegs), 250 VMSTATE_UINT8(tco.msg1, TCOIORegs), 251 VMSTATE_UINT8(tco.msg2, TCOIORegs), 252 VMSTATE_UINT8(tco.wdcnt, TCOIORegs), 253 VMSTATE_UINT16(tco.tmr, TCOIORegs), 254 VMSTATE_UINT8(sw_irq_gen, TCOIORegs), 255 VMSTATE_TIMER_PTR(tco_timer, TCOIORegs), 256 VMSTATE_INT64(expire_time, TCOIORegs), 257 VMSTATE_UINT8(timeouts_no, TCOIORegs), 258 VMSTATE_END_OF_LIST() 259 } 260 };