diff options
Diffstat (limited to 'drivers/acpi/acpica/hwacpi.c')
| -rw-r--r-- | drivers/acpi/acpica/hwacpi.c | 56 |
1 files changed, 26 insertions, 30 deletions
diff --git a/drivers/acpi/acpica/hwacpi.c b/drivers/acpi/acpica/hwacpi.c index a9d4fea4167..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 - 2008, 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 * @@ -63,10 +63,15 @@ acpi_status acpi_hw_set_mode(u32 mode) { acpi_status status; - u32 retry; 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. @@ -86,7 +91,8 @@ acpi_status acpi_hw_set_mode(u32 mode) */ if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) { ACPI_ERROR((AE_INFO, - "No ACPI mode transition supported in this system (enable/disable both zero)")); + "No ACPI mode transition supported in this system " + "(enable/disable both zero)")); return_ACPI_STATUS(AE_OK); } @@ -95,26 +101,25 @@ acpi_status acpi_hw_set_mode(u32 mode) /* BIOS should have disabled ALL fixed and GP events */ - status = acpi_os_write_port(acpi_gbl_FADT.smi_command, + status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, (u32) acpi_gbl_FADT.acpi_enable, 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 = acpi_os_write_port(acpi_gbl_FADT.smi_command, - (u32) acpi_gbl_FADT.acpi_disable, - 8); + status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, + (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); } @@ -124,24 +129,7 @@ acpi_status acpi_hw_set_mode(u32 mode) 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 (acpi_hw_get_mode() == mode) { - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Mode %X successfully enabled\n", - mode)); - return_ACPI_STATUS(AE_OK); - } - acpi_os_stall(1000); - retry--; - } - - ACPI_ERROR((AE_INFO, "Hardware did not change modes")); - return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); + return_ACPI_STATUS(AE_OK); } /******************************************************************************* @@ -152,7 +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. * ******************************************************************************/ @@ -164,6 +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. @@ -172,7 +166,7 @@ u32 acpi_hw_get_mode(void) return_UINT32(ACPI_SYS_MODE_ACPI); } - status = acpi_get_register(ACPI_BITREG_SCI_ENABLE, &value); + status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value); if (ACPI_FAILURE(status)) { return_UINT32(ACPI_SYS_MODE_LEGACY); } @@ -183,3 +177,5 @@ u32 acpi_hw_get_mode(void) return_UINT32(ACPI_SYS_MODE_LEGACY); } } + +#endif /* !ACPI_REDUCED_HARDWARE */ |