^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2000 - 2020, Intel Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *****************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <acpi/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include "accommon.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define _COMPONENT ACPI_HARDWARE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) ACPI_MODULE_NAME("hwacpi")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * FUNCTION: acpi_hw_set_mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * PARAMETERS: mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * RETURN: Status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * DESCRIPTION: Transitions the system into the requested mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) ******************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) acpi_status acpi_hw_set_mode(u32 mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) ACPI_FUNCTION_TRACE(hw_set_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /* If the Hardware Reduced flag is set, machine is always in acpi mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) if (acpi_gbl_reduced_hardware) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return_ACPI_STATUS(AE_OK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * system does not support mode transition.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (!acpi_gbl_FADT.smi_command) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ACPI_ERROR((AE_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) "No SMI_CMD in FADT, mode transition failed"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * in FADT: If it is zero, enabling or disabling is not supported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * As old systems may have used zero for mode transition,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * we make sure both the numbers are zero to determine these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * transitions are not supported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ACPI_ERROR((AE_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) "No ACPI mode transition supported in this system "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) "(enable/disable both zero)"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return_ACPI_STATUS(AE_OK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) switch (mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) case ACPI_SYS_MODE_ACPI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /* BIOS should have disabled ALL fixed and GP events */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) (u32) acpi_gbl_FADT.acpi_enable, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) "Attempting to enable ACPI mode\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) case ACPI_SYS_MODE_LEGACY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * BIOS should clear all fixed status bits and restore fixed event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * enable bits to default
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) (u32)acpi_gbl_FADT.acpi_disable, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) "Attempting to enable Legacy (non-ACPI) mode\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return_ACPI_STATUS(AE_BAD_PARAMETER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (ACPI_FAILURE(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) ACPI_EXCEPTION((AE_INFO, status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) "Could not write ACPI mode change"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return_ACPI_STATUS(status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return_ACPI_STATUS(AE_OK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /*******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * FUNCTION: acpi_hw_get_mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * PARAMETERS: none
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * DESCRIPTION: Return current operating state of system. Determined by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * querying the SCI_EN bit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ******************************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) u32 acpi_hw_get_mode(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) u32 value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) ACPI_FUNCTION_TRACE(hw_get_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* If the Hardware Reduced flag is set, machine is always in acpi mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (acpi_gbl_reduced_hardware) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return_UINT32(ACPI_SYS_MODE_ACPI);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * system does not support mode transition.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (!acpi_gbl_FADT.smi_command) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return_UINT32(ACPI_SYS_MODE_ACPI);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (ACPI_FAILURE(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return_UINT32(ACPI_SYS_MODE_LEGACY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (value) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return_UINT32(ACPI_SYS_MODE_ACPI);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return_UINT32(ACPI_SYS_MODE_LEGACY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) #endif /* !ACPI_REDUCED_HARDWARE */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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