diff options
Diffstat (limited to 'drivers/acpi/acpica/hwacpi.c')
| -rw-r--r-- | drivers/acpi/acpica/hwacpi.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/drivers/acpi/acpica/hwacpi.c b/drivers/acpi/acpica/hwacpi.c index b44274a0b62..1e66d960fc1 100644 --- a/drivers/acpi/acpica/hwacpi.c +++ b/drivers/acpi/acpica/hwacpi.c @@ -1,4 +1,3 @@ - /****************************************************************************** * * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface @@ -6,7 +5,7 @@ *****************************************************************************/ /* - * Copyright (C) 2000 - 2010, Intel Corp. + * Copyright (C) 2000 - 2014, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -48,11 +47,12 @@ #define _COMPONENT ACPI_HARDWARE ACPI_MODULE_NAME("hwacpi") +#if (!ACPI_REDUCED_HARDWARE) /* Entire module */ /****************************************************************************** * * FUNCTION: acpi_hw_set_mode * - * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY + * PARAMETERS: mode - SYS_MODE_ACPI or SYS_MODE_LEGACY * * RETURN: Status * @@ -66,6 +66,12 @@ acpi_status acpi_hw_set_mode(u32 mode) ACPI_FUNCTION_TRACE(hw_set_mode); + /* If the Hardware Reduced flag is set, machine is always in acpi mode */ + + if (acpi_gbl_reduced_hardware) { + return_ACPI_STATUS(AE_OK); + } + /* * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, * system does not support mode transition. @@ -102,19 +108,18 @@ acpi_status acpi_hw_set_mode(u32 mode) break; case ACPI_SYS_MODE_LEGACY: - /* * BIOS should clear all fixed status bits and restore fixed event * enable bits to default */ status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, - (u32) acpi_gbl_FADT.acpi_disable, - 8); + (u32)acpi_gbl_FADT.acpi_disable, 8); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Attempting to enable Legacy (non-ACPI) mode\n")); break; default: + return_ACPI_STATUS(AE_BAD_PARAMETER); } @@ -135,7 +140,7 @@ acpi_status acpi_hw_set_mode(u32 mode) * * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY * - * DESCRIPTION: Return current operating state of system. Determined by + * DESCRIPTION: Return current operating state of system. Determined by * querying the SCI_EN bit. * ******************************************************************************/ @@ -147,6 +152,12 @@ u32 acpi_hw_get_mode(void) ACPI_FUNCTION_TRACE(hw_get_mode); + /* If the Hardware Reduced flag is set, machine is always in acpi mode */ + + if (acpi_gbl_reduced_hardware) { + return_UINT32(ACPI_SYS_MODE_ACPI); + } + /* * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, * system does not support mode transition. @@ -166,3 +177,5 @@ u32 acpi_hw_get_mode(void) return_UINT32(ACPI_SYS_MODE_LEGACY); } } + +#endif /* !ACPI_REDUCED_HARDWARE */ |