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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6595 | serge | 1 | /****************************************************************************** |
| 2 | * |
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| 3 | * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface |
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| 4 | * |
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| 5 | *****************************************************************************/ |
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| 6 | |||
| 7 | /* |
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| 8 | * Copyright (C) 2000 - 2015, Intel Corp. |
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| 9 | * All rights reserved. |
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| 10 | * |
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| 11 | * Redistribution and use in source and binary forms, with or without |
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| 12 | * modification, are permitted provided that the following conditions |
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| 13 | * are met: |
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| 14 | * 1. Redistributions of source code must retain the above copyright |
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| 15 | * notice, this list of conditions, and the following disclaimer, |
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| 16 | * without modification. |
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| 17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
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| 18 | * substantially similar to the "NO WARRANTY" disclaimer below |
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| 19 | * ("Disclaimer") and any redistribution must be conditioned upon |
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| 20 | * including a substantially similar Disclaimer requirement for further |
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| 21 | * binary redistribution. |
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| 22 | * 3. Neither the names of the above-listed copyright holders nor the names |
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| 23 | * of any contributors may be used to endorse or promote products derived |
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| 24 | * from this software without specific prior written permission. |
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| 25 | * |
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| 26 | * Alternatively, this software may be distributed under the terms of the |
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| 27 | * GNU General Public License ("GPL") version 2 as published by the Free |
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| 28 | * Software Foundation. |
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| 29 | * |
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| 30 | * NO WARRANTY |
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| 31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
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| 34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| 35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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| 39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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| 40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 41 | * POSSIBILITY OF SUCH DAMAGES. |
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| 42 | */ |
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| 43 | |||
| 44 | #include |
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| 45 | #include "accommon.h" |
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| 46 | |||
| 47 | #define _COMPONENT ACPI_HARDWARE |
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| 48 | ACPI_MODULE_NAME("hwacpi") |
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| 49 | |||
| 50 | #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ |
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| 51 | /****************************************************************************** |
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| 52 | * |
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| 53 | * FUNCTION: acpi_hw_set_mode |
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| 54 | * |
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| 55 | * PARAMETERS: mode - SYS_MODE_ACPI or SYS_MODE_LEGACY |
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| 56 | * |
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| 57 | * RETURN: Status |
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| 58 | * |
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| 59 | * DESCRIPTION: Transitions the system into the requested mode. |
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| 60 | * |
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| 61 | ******************************************************************************/ |
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| 62 | acpi_status acpi_hw_set_mode(u32 mode) |
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| 63 | { |
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| 64 | |||
| 65 | acpi_status status; |
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| 66 | |||
| 67 | ACPI_FUNCTION_TRACE(hw_set_mode); |
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| 68 | |||
| 69 | /* If the Hardware Reduced flag is set, machine is always in acpi mode */ |
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| 70 | |||
| 71 | if (acpi_gbl_reduced_hardware) { |
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| 72 | return_ACPI_STATUS(AE_OK); |
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| 73 | } |
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| 74 | |||
| 75 | /* |
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| 76 | * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, |
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| 77 | * system does not support mode transition. |
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| 78 | */ |
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| 79 | if (!acpi_gbl_FADT.smi_command) { |
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| 80 | ACPI_ERROR((AE_INFO, |
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| 81 | "No SMI_CMD in FADT, mode transition failed")); |
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| 82 | return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
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| 83 | } |
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| 84 | |||
| 85 | /* |
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| 86 | * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE |
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| 87 | * in FADT: If it is zero, enabling or disabling is not supported. |
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| 88 | * As old systems may have used zero for mode transition, |
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| 89 | * we make sure both the numbers are zero to determine these |
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| 90 | * transitions are not supported. |
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| 91 | */ |
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| 92 | if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) { |
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| 93 | ACPI_ERROR((AE_INFO, |
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| 94 | "No ACPI mode transition supported in this system " |
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| 95 | "(enable/disable both zero)")); |
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| 96 | return_ACPI_STATUS(AE_OK); |
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| 97 | } |
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| 98 | |||
| 99 | switch (mode) { |
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| 100 | case ACPI_SYS_MODE_ACPI: |
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| 101 | |||
| 102 | /* BIOS should have disabled ALL fixed and GP events */ |
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| 103 | |||
| 104 | status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, |
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| 105 | (u32) acpi_gbl_FADT.acpi_enable, 8); |
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| 106 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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| 107 | "Attempting to enable ACPI mode\n")); |
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| 108 | break; |
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| 109 | |||
| 110 | case ACPI_SYS_MODE_LEGACY: |
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| 111 | /* |
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| 112 | * BIOS should clear all fixed status bits and restore fixed event |
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| 113 | * enable bits to default |
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| 114 | */ |
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| 115 | status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, |
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| 116 | (u32)acpi_gbl_FADT.acpi_disable, 8); |
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| 117 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
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| 118 | "Attempting to enable Legacy (non-ACPI) mode\n")); |
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| 119 | break; |
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| 120 | |||
| 121 | default: |
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| 122 | |||
| 123 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
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| 124 | } |
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| 125 | |||
| 126 | if (ACPI_FAILURE(status)) { |
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| 127 | ACPI_EXCEPTION((AE_INFO, status, |
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| 128 | "Could not write ACPI mode change")); |
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| 129 | return_ACPI_STATUS(status); |
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| 130 | } |
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| 131 | |||
| 132 | return_ACPI_STATUS(AE_OK); |
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| 133 | } |
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| 134 | |||
| 135 | /******************************************************************************* |
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| 136 | * |
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| 137 | * FUNCTION: acpi_hw_get_mode |
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| 138 | * |
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| 139 | * PARAMETERS: none |
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| 140 | * |
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| 141 | * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY |
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| 142 | * |
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| 143 | * DESCRIPTION: Return current operating state of system. Determined by |
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| 144 | * querying the SCI_EN bit. |
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| 145 | * |
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| 146 | ******************************************************************************/ |
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| 147 | |||
| 148 | u32 acpi_hw_get_mode(void) |
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| 149 | { |
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| 150 | acpi_status status; |
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| 151 | u32 value; |
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| 152 | |||
| 153 | ACPI_FUNCTION_TRACE(hw_get_mode); |
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| 154 | |||
| 155 | /* If the Hardware Reduced flag is set, machine is always in acpi mode */ |
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| 156 | |||
| 157 | if (acpi_gbl_reduced_hardware) { |
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| 158 | return_UINT32(ACPI_SYS_MODE_ACPI); |
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| 159 | } |
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| 160 | |||
| 161 | /* |
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| 162 | * ACPI 2.0 clarified that if SMI_CMD in FADT is zero, |
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| 163 | * system does not support mode transition. |
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| 164 | */ |
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| 165 | if (!acpi_gbl_FADT.smi_command) { |
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| 166 | return_UINT32(ACPI_SYS_MODE_ACPI); |
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| 167 | } |
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| 168 | |||
| 169 | status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value); |
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| 170 | if (ACPI_FAILURE(status)) { |
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| 171 | return_UINT32(ACPI_SYS_MODE_LEGACY); |
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| 172 | } |
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| 173 | |||
| 174 | if (value) { |
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| 175 | return_UINT32(ACPI_SYS_MODE_ACPI); |
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| 176 | } else { |
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| 177 | return_UINT32(ACPI_SYS_MODE_LEGACY); |
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| 178 | } |
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| 179 | } |
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| 180 | |||
| 181 | #endif /* !ACPI_REDUCED_HARDWARE */ |