| 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 | } |