hw/acpi/ich9_timer.c

   1 /*
   2  * QEMU ICH9 Timer emulation
   3  *
   4  * Copyright (c) 2024 Dominic Prinz <git@dprinz.de>
   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 "hw/core/cpu.h"
  12 #include "hw/pci/pci.h"
  13 #include "hw/southbridge/ich9.h"
  14 #include "qemu/timer.h"
  15
  16 #include "hw/acpi/ich9_timer.h"
  17
  18 void ich9_pm_update_swsmi_timer(ICH9LPCPMRegs *pm, bool enable)
  19 {
  20     uint16_t swsmi_rate_sel;
  21     int64_t expire_time;
  22     ICH9LPCState *lpc;
  23
  24     if (enable) {
  25         lpc = container_of(pm, ICH9LPCState, pm);
  26         swsmi_rate_sel =
  27             (pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_3) & 0xc0) >> 6;
  28
  29         if (swsmi_rate_sel == 0) {
  30             expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 1500000LL;
  31         } else {
  32             expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
  33                           8 * (1 << swsmi_rate_sel) * 1000000LL;
  34         }
  35
  36         timer_mod(pm->swsmi_timer, expire_time);
  37     } else {
  38         timer_del(pm->swsmi_timer);
  39     }
  40 }
  41
  42 static void ich9_pm_swsmi_timer_expired(void *opaque)
  43 {
  44     ICH9LPCPMRegs *pm = opaque;
  45
  46     pm->smi_sts |= ICH9_PMIO_SMI_STS_SWSMI_STS;
  47     ich9_generate_smi();
  48
  49     ich9_pm_update_swsmi_timer(pm, pm->smi_en & ICH9_PMIO_SMI_EN_SWSMI_EN);
  50 }
  51
  52 void ich9_pm_swsmi_timer_init(ICH9LPCPMRegs *pm)
  53 {
  54     pm->smi_sts_wmask |= ICH9_PMIO_SMI_STS_SWSMI_STS;
  55     pm->swsmi_timer =
  56         timer_new_ns(QEMU_CLOCK_VIRTUAL, ich9_pm_swsmi_timer_expired, pm);
  57 }
  58
  59 void ich9_pm_update_periodic_timer(ICH9LPCPMRegs *pm, bool enable)
  60 {
  61     uint16_t per_smi_sel;
  62     int64_t expire_time;
  63     ICH9LPCState *lpc;
  64
  65     if (enable) {
  66         lpc = container_of(pm, ICH9LPCState, pm);
  67         per_smi_sel = pci_get_word(lpc->d.config + ICH9_LPC_GEN_PMCON_1) & 3;
  68         expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
  69                       8 * (1 << (3 - per_smi_sel)) * NANOSECONDS_PER_SECOND;
  70
  71         timer_mod(pm->periodic_timer, expire_time);
  72     } else {
  73         timer_del(pm->periodic_timer);
  74     }
  75 }
  76
  77 static void ich9_pm_periodic_timer_expired(void *opaque)
  78 {
  79     ICH9LPCPMRegs *pm = opaque;
  80
  81     pm->smi_sts = ICH9_PMIO_SMI_STS_PERIODIC_STS;
  82     ich9_generate_smi();
  83
  84     ich9_pm_update_periodic_timer(pm,
  85                                   pm->smi_en & ICH9_PMIO_SMI_EN_PERIODIC_EN);
  86 }
  87
  88 void ich9_pm_periodic_timer_init(ICH9LPCPMRegs *pm)
  89 {
  90     pm->smi_sts_wmask |= ICH9_PMIO_SMI_STS_PERIODIC_STS;
  91     pm->periodic_timer =
  92         timer_new_ns(QEMU_CLOCK_VIRTUAL, ich9_pm_periodic_timer_expired, pm);
  93 }