diff options
Diffstat (limited to 'usr/src/common/acpica/hardware/hwacpi.c')
| -rw-r--r-- | usr/src/common/acpica/hardware/hwacpi.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/usr/src/common/acpica/hardware/hwacpi.c b/usr/src/common/acpica/hardware/hwacpi.c new file mode 100644 index 0000000000..73512128d5 --- /dev/null +++ b/usr/src/common/acpica/hardware/hwacpi.c @@ -0,0 +1,221 @@ +/****************************************************************************** + * + * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2016, Intel Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + +#include "acpi.h" +#include "accommon.h" + + +#define _COMPONENT ACPI_HARDWARE + ACPI_MODULE_NAME ("hwacpi") + + +#if (!ACPI_REDUCED_HARDWARE) /* Entire module */ +/****************************************************************************** + * + * FUNCTION: AcpiHwSetMode + * + * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY + * + * RETURN: Status + * + * DESCRIPTION: Transitions the system into the requested mode. + * + ******************************************************************************/ + +ACPI_STATUS +AcpiHwSetMode ( + UINT32 Mode) +{ + + ACPI_STATUS Status; + UINT32 Retry; + + + ACPI_FUNCTION_TRACE (HwSetMode); + + + /* If the Hardware Reduced flag is set, machine is always in acpi mode */ + + if (AcpiGbl_ReducedHardware) + { + return_ACPI_STATUS (AE_OK); + } + + /* + * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, + * system does not support mode transition. + */ + if (!AcpiGbl_FADT.SmiCommand) + { + ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed")); + return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); + } + + /* + * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE + * in FADT: If it is zero, enabling or disabling is not supported. + * As old systems may have used zero for mode transition, + * we make sure both the numbers are zero to determine these + * transitions are not supported. + */ + if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable) + { + ACPI_ERROR ((AE_INFO, + "No ACPI mode transition supported in this system " + "(enable/disable both zero)")); + return_ACPI_STATUS (AE_OK); + } + + switch (Mode) + { + case ACPI_SYS_MODE_ACPI: + + /* BIOS should have disabled ALL fixed and GP events */ + + Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, + (UINT32) AcpiGbl_FADT.AcpiEnable, 8); + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n")); + break; + + case ACPI_SYS_MODE_LEGACY: + /* + * BIOS should clear all fixed status bits and restore fixed event + * enable bits to default + */ + Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, + (UINT32) AcpiGbl_FADT.AcpiDisable, 8); + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Attempting to enable Legacy (non-ACPI) mode\n")); + break; + + default: + + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + if (ACPI_FAILURE (Status)) + { + ACPI_EXCEPTION ((AE_INFO, Status, + "Could not write ACPI mode change")); + return_ACPI_STATUS (Status); + } + + /* + * Some hardware takes a LONG time to switch modes. Give them 3 sec to + * do so, but allow faster systems to proceed more quickly. + */ + Retry = 3000; + while (Retry) + { + if (AcpiHwGetMode () == Mode) + { + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Mode %X successfully enabled\n", Mode)); + return_ACPI_STATUS (AE_OK); + } + AcpiOsStall (ACPI_USEC_PER_MSEC); + Retry--; + } + + ACPI_ERROR ((AE_INFO, "Hardware did not change modes")); + return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiHwGetMode + * + * PARAMETERS: none + * + * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY + * + * DESCRIPTION: Return current operating state of system. Determined by + * querying the SCI_EN bit. + * + ******************************************************************************/ + +UINT32 +AcpiHwGetMode ( + void) +{ + ACPI_STATUS Status; + UINT32 Value; + + + ACPI_FUNCTION_TRACE (HwGetMode); + + + /* If the Hardware Reduced flag is set, machine is always in acpi mode */ + + if (AcpiGbl_ReducedHardware) + { + return_UINT32 (ACPI_SYS_MODE_ACPI); + } + + /* + * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, + * system does not support mode transition. + */ + if (!AcpiGbl_FADT.SmiCommand) + { + return_UINT32 (ACPI_SYS_MODE_ACPI); + } + + Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value); + if (ACPI_FAILURE (Status)) + { + return_UINT32 (ACPI_SYS_MODE_LEGACY); + } + + if (Value) + { + return_UINT32 (ACPI_SYS_MODE_ACPI); + } + else + { + return_UINT32 (ACPI_SYS_MODE_LEGACY); + } +} + +#endif /* !ACPI_REDUCED_HARDWARE */ |