acpi_status acpi_hw_register_write(u32 register_id, u32 value)
{
acpi_status status;
u32 read_value;
ACPI_FUNCTION_TRACE(hw_register_write);
switch (register_id) {
case ACPI_REGISTER_PM1_STATUS:
value &= ~ACPI_PM1_STATUS_PRESERVED_BITS;
status = acpi_hw_write_multiple(value,
&acpi_gbl_xpm1a_status,
&acpi_gbl_xpm1b_status);
break;
case ACPI_REGISTER_PM1_ENABLE:
status = acpi_hw_write_multiple(value,
&acpi_gbl_xpm1a_enable,
&acpi_gbl_xpm1b_enable);
break;
case ACPI_REGISTER_PM1_CONTROL:
status = acpi_hw_read_multiple(&read_value,
&acpi_gbl_FADT.
xpm1a_control_block,
&acpi_gbl_FADT.
xpm1b_control_block);
if (ACPI_FAILURE(status)) {
goto exit;
}
ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS,
read_value);
status = acpi_hw_write_multiple(value,
&acpi_gbl_FADT.
xpm1a_control_block,
&acpi_gbl_FADT.
xpm1b_control_block);
break;
case ACPI_REGISTER_PM2_CONTROL:
status =
acpi_hw_read(&read_value,
&acpi_gbl_FADT.xpm2_control_block);
if (ACPI_FAILURE(status)) {
goto exit;
}
ACPI_INSERT_BITS(value, ACPI_PM2_CONTROL_PRESERVED_BITS,
read_value);
status =
acpi_hw_write(value, &acpi_gbl_FADT.xpm2_control_block);
break;
case ACPI_REGISTER_PM_TIMER:
status = acpi_hw_write(value, &acpi_gbl_FADT.xpm_timer_block);
break;
case ACPI_REGISTER_SMI_COMMAND_BLOCK:
status =
acpi_hw_write_port(acpi_gbl_FADT.smi_command, value, 8);
break;
default:
ACPI_ERROR((AE_INFO, "Unknown Register ID: %X", register_id));
status = AE_BAD_PARAMETER;
break;
}
exit:
return_ACPI_STATUS(status);
}
acpi_status acpi_hw_register_write(u32 register_id, u32 value)
{
acpi_status status;
u32 read_value;
struct acpi_generic_address reg;
ACPI_FUNCTION_TRACE(hw_register_write);
switch (register_id) {
case ACPI_REGISTER_PM1_STATUS: /* PM1 A/B: 16-bit access each */
/*
* Handle the "ignored" bit in PM1 Status. According to the ACPI
* specification, ignored bits are to be preserved when writing.
* Normally, this would mean a read/modify/write sequence. However,
* preserving a bit in the status register is different. Writing a
* one clears the status, and writing a zero preserves the status.
* Therefore, we must always write zero to the ignored bit.
*
* This behavior is clarified in the ACPI 4.0 specification.
*/
value &= ~ACPI_PM1_STATUS_PRESERVED_BITS;
status = acpi_hw_write_multiple(value,
&acpi_gbl_xpm1a_status,
&acpi_gbl_xpm1b_status);
break;
case ACPI_REGISTER_PM1_ENABLE: /* PM1 A/B: 16-bit access each */
status = acpi_hw_write_multiple(value,
&acpi_gbl_xpm1a_enable,
&acpi_gbl_xpm1b_enable);
break;
case ACPI_REGISTER_PM1_CONTROL: /* PM1 A/B: 16-bit access each */
/*
* Perform a read first to preserve certain bits (per ACPI spec)
* Note: This includes SCI_EN, we never want to change this bit
*/
status = acpi_hw_read_multiple(&read_value,
&acpi_gbl_FADT.
xpm1a_control_block,
&acpi_gbl_FADT.
xpm1b_control_block);
if (ACPI_FAILURE(status)) {
goto exit;
}
/* Insert the bits to be preserved */
ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS,
read_value);
/* Now we can write the data */
status = acpi_hw_write_multiple(value,
&acpi_gbl_FADT.
xpm1a_control_block,
&acpi_gbl_FADT.
xpm1b_control_block);
break;
case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
/*
* For control registers, all reserved bits must be preserved,
* as per the ACPI spec.
*/
status =
acpi_hw_read(&read_value,
&acpi_gbl_FADT.xpm2_control_block);
if (ACPI_FAILURE(status)) {
goto exit;
}
/* Insert the bits to be preserved */
ACPI_INSERT_BITS(value, ACPI_PM2_CONTROL_PRESERVED_BITS,
read_value);
status =
acpi_hw_write(value, &acpi_gbl_FADT.xpm2_control_block);
break;
case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
status = acpi_hw_write(value, &acpi_gbl_FADT.xpm_timer_block);
break;
case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
/* SMI_CMD is currently always in IO space */
status =
acpi_hw_write_port(acpi_gbl_FADT.smi_command, value, 8);
break;
case ACPI_REGISTER_GPE0_STATUS:
reg = acpi_gbl_FADT.xgpe0_block;
reg.bit_width = 32;
reg.address = 0x420;
status = acpi_hw_write(value, ®);
break;
case ACPI_REGISTER_GPE0_ENABLE:
reg = acpi_gbl_FADT.xgpe0_block;
reg.bit_width = 32;
reg.address = 0x428;
status = acpi_hw_write(value, ®);
break;
default:
ACPI_ERROR((AE_INFO, "Unknown Register ID: 0x%X", register_id));
status = AE_BAD_PARAMETER;
break;
}
exit:
return_ACPI_STATUS(status);
}
ACPI_STATUS
AcpiHwRegisterWrite (
UINT32 RegisterId,
UINT32 Value)
{
ACPI_STATUS Status;
UINT32 ReadValue;
ACPI_FUNCTION_TRACE (HwRegisterWrite);
switch (RegisterId)
{
case ACPI_REGISTER_PM1_STATUS: /* PM1 A/B: 16-bit access each */
/*
* Handle the "ignored" bit in PM1 Status. According to the ACPI
* specification, ignored bits are to be preserved when writing.
* Normally, this would mean a read/modify/write sequence. However,
* preserving a bit in the status register is different. Writing a
* one clears the status, and writing a zero preserves the status.
* Therefore, we must always write zero to the ignored bit.
*
* This behavior is clarified in the ACPI 4.0 specification.
*/
Value &= ~ACPI_PM1_STATUS_PRESERVED_BITS;
Status = AcpiHwWriteMultiple (Value,
&AcpiGbl_XPm1aStatus,
&AcpiGbl_XPm1bStatus);
break;
case ACPI_REGISTER_PM1_ENABLE: /* PM1 A/B: 16-bit access each */
Status = AcpiHwWriteMultiple (Value,
&AcpiGbl_XPm1aEnable,
&AcpiGbl_XPm1bEnable);
break;
case ACPI_REGISTER_PM1_CONTROL: /* PM1 A/B: 16-bit access each */
/*
* Perform a read first to preserve certain bits (per ACPI spec)
* Note: This includes SCI_EN, we never want to change this bit
*/
Status = AcpiHwReadMultiple (&ReadValue,
&AcpiGbl_FADT.XPm1aControlBlock,
&AcpiGbl_FADT.XPm1bControlBlock);
if (ACPI_FAILURE (Status))
{
goto Exit;
}
/* Insert the bits to be preserved */
ACPI_INSERT_BITS (Value, ACPI_PM1_CONTROL_PRESERVED_BITS, ReadValue);
/* Now we can write the data */
Status = AcpiHwWriteMultiple (Value,
&AcpiGbl_FADT.XPm1aControlBlock,
&AcpiGbl_FADT.XPm1bControlBlock);
break;
case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
/*
* For control registers, all reserved bits must be preserved,
* as per the ACPI spec.
*/
Status = AcpiHwRead (&ReadValue, &AcpiGbl_FADT.XPm2ControlBlock);
if (ACPI_FAILURE (Status))
{
goto Exit;
}
/* Insert the bits to be preserved */
ACPI_INSERT_BITS (Value, ACPI_PM2_CONTROL_PRESERVED_BITS, ReadValue);
Status = AcpiHwWrite (Value, &AcpiGbl_FADT.XPm2ControlBlock);
break;
case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
Status = AcpiHwWrite (Value, &AcpiGbl_FADT.XPmTimerBlock);
break;
case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
/* SMI_CMD is currently always in IO space */
Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, Value, 8);
break;
default:
ACPI_ERROR ((AE_INFO, "Unknown Register ID: 0x%X",
RegisterId));
Status = AE_BAD_PARAMETER;
break;
}
Exit:
return_ACPI_STATUS (Status);
}
