2 /******************************************************************************
4 * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
6 *****************************************************************************/
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47 #include <contrib/dev/acpica/include/acpi.h>
48 #include <contrib/dev/acpica/include/accommon.h>
51 #define _COMPONENT ACPI_HARDWARE
52 ACPI_MODULE_NAME ("hwacpi")
55 /******************************************************************************
57 * FUNCTION: AcpiHwSetMode
59 * PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
63 * DESCRIPTION: Transitions the system into the requested mode.
65 ******************************************************************************/
76 ACPI_FUNCTION_TRACE (HwSetMode);
79 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
80 * system does not support mode transition.
82 if (!AcpiGbl_FADT.SmiCommand)
84 ACPI_ERROR ((AE_INFO, "No SMI_CMD in FADT, mode transition failed"));
85 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
89 * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
90 * in FADT: If it is zero, enabling or disabling is not supported.
91 * As old systems may have used zero for mode transition,
92 * we make sure both the numbers are zero to determine these
93 * transitions are not supported.
95 if (!AcpiGbl_FADT.AcpiEnable && !AcpiGbl_FADT.AcpiDisable)
98 "No ACPI mode transition supported in this system "
99 "(enable/disable both zero)"));
100 return_ACPI_STATUS (AE_OK);
105 case ACPI_SYS_MODE_ACPI:
107 /* BIOS should have disabled ALL fixed and GP events */
109 Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
110 (UINT32) AcpiGbl_FADT.AcpiEnable, 8);
111 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Attempting to enable ACPI mode\n"));
114 case ACPI_SYS_MODE_LEGACY:
117 * BIOS should clear all fixed status bits and restore fixed event
118 * enable bits to default
120 Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand,
121 (UINT32) AcpiGbl_FADT.AcpiDisable, 8);
122 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
123 "Attempting to enable Legacy (non-ACPI) mode\n"));
127 return_ACPI_STATUS (AE_BAD_PARAMETER);
130 if (ACPI_FAILURE (Status))
132 ACPI_EXCEPTION ((AE_INFO, Status,
133 "Could not write ACPI mode change"));
134 return_ACPI_STATUS (Status);
138 * Some hardware takes a LONG time to switch modes. Give them 3 sec to
139 * do so, but allow faster systems to proceed more quickly.
144 if (AcpiHwGetMode() == Mode)
146 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Mode %X successfully enabled\n",
148 return_ACPI_STATUS (AE_OK);
154 ACPI_ERROR ((AE_INFO, "Hardware did not change modes"));
155 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
159 /*******************************************************************************
161 * FUNCTION: AcpiHwGetMode
165 * RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
167 * DESCRIPTION: Return current operating state of system. Determined by
168 * querying the SCI_EN bit.
170 ******************************************************************************/
180 ACPI_FUNCTION_TRACE (HwGetMode);
184 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
185 * system does not support mode transition.
187 if (!AcpiGbl_FADT.SmiCommand)
189 return_UINT32 (ACPI_SYS_MODE_ACPI);
192 Status = AcpiReadBitRegister (ACPI_BITREG_SCI_ENABLE, &Value);
193 if (ACPI_FAILURE (Status))
195 return_UINT32 (ACPI_SYS_MODE_LEGACY);
200 return_UINT32 (ACPI_SYS_MODE_ACPI);
204 return_UINT32 (ACPI_SYS_MODE_LEGACY);