ACPI_FUNCTION_NAME(acpi_read);
/*
- * Must have a valid pointer to a GAS structure, and
- * a non-zero address within. However, don't return an error
- * because the PM1A/B code must not fail if B isn't present.
+ * Must have a valid pointer to a GAS structure, and a non-zero address
+ * within.
*/
if (!reg) {
- return (AE_OK);
+ return (AE_BAD_PARAMETER);
}
/* Get a local copy of the address. Handles possible alignment issues */
ACPI_MOVE_64_TO_64(&address, ®->address);
if (!address) {
- return (AE_OK);
+ return (AE_BAD_ADDRESS);
}
/* Supported widths are 8/16/32 */
*value = 0;
/*
- * Two address spaces supported: Memory or IO.
- * PCI_Config is not supported here because the GAS struct is insufficient
+ * Two address spaces supported: Memory or IO. PCI_Config is
+ * not supported here because the GAS structure is insufficient
*/
switch (reg->space_id) {
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
case ACPI_ADR_SPACE_SYSTEM_IO:
status =
- acpi_os_read_port((acpi_io_address) address, value, width);
+ acpi_hw_read_port((acpi_io_address) address, value, width);
break;
default:
ACPI_FUNCTION_NAME(acpi_write);
/*
- * Must have a valid pointer to a GAS structure, and
- * a non-zero address within. However, don't return an error
- * because the PM1A/B code must not fail if B isn't present.
+ * Must have a valid pointer to a GAS structure, and a non-zero address
+ * within.
*/
if (!reg) {
- return (AE_OK);
+ return (AE_BAD_PARAMETER);
}
/* Get a local copy of the address. Handles possible alignment issues */
ACPI_MOVE_64_TO_64(&address, ®->address);
if (!address) {
- return (AE_OK);
+ return (AE_BAD_ADDRESS);
}
/* Supported widths are 8/16/32 */
case ACPI_ADR_SPACE_SYSTEM_IO:
- status = acpi_os_write_port((acpi_io_address) address, value,
+ status = acpi_hw_write_port((acpi_io_address) address, value,
width);
break;
/*******************************************************************************
*
- * FUNCTION: acpi_get_register_unlocked
+ * FUNCTION: acpi_read_bit_register
*
- * PARAMETERS: register_id - ID of ACPI bit_register to access
- * return_value - Value that was read from the register
+ * PARAMETERS: register_id - ID of ACPI Bit Register to access
+ * return_value - Value that was read from the register,
+ * normalized to bit position zero.
*
- * RETURN: Status and the value read from specified Register. Value
+ * RETURN: Status and the value read from the specified Register. Value
* returned is normalized to bit0 (is shifted all the way right)
*
* DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
*
+ * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
+ * PM2 Control.
+ *
+ * Note: The hardware lock is not required when reading the ACPI bit registers
+ * since almost all of them are single bit and it does not matter that
+ * the parent hardware register can be split across two physical
+ * registers. The only multi-bit field is SLP_TYP in the PM1 control
+ * register, but this field does not cross an 8-bit boundary (nor does
+ * it make much sense to actually read this field.)
+ *
******************************************************************************/
-acpi_status acpi_get_register_unlocked(u32 register_id, u32 *return_value)
+acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value)
{
- u32 register_value = 0;
struct acpi_bit_register_info *bit_reg_info;
+ u32 register_value;
+ u32 value;
acpi_status status;
- ACPI_FUNCTION_TRACE(acpi_get_register_unlocked);
+ ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id);
/* Get the info structure corresponding to the requested ACPI Register */
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
- /* Read from the register */
+ /* Read the entire parent register */
status = acpi_hw_register_read(bit_reg_info->parent_register,
®ister_value);
-
- if (ACPI_SUCCESS(status)) {
-
- /* Normalize the value that was read */
-
- register_value =
- ((register_value & bit_reg_info->access_bit_mask)
- >> bit_reg_info->bit_position);
-
- *return_value = register_value;
-
- ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n",
- register_value,
- bit_reg_info->parent_register));
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
}
- return_ACPI_STATUS(status);
-}
+ /* Normalize the value that was read, mask off other bits */
-ACPI_EXPORT_SYMBOL(acpi_get_register_unlocked)
+ value = ((register_value & bit_reg_info->access_bit_mask)
+ >> bit_reg_info->bit_position);
-/*******************************************************************************
- *
- * FUNCTION: acpi_get_register
- *
- * PARAMETERS: register_id - ID of ACPI bit_register to access
- * return_value - Value that was read from the register
- *
- * RETURN: Status and the value read from specified Register. Value
- * returned is normalized to bit0 (is shifted all the way right)
- *
- * DESCRIPTION: ACPI bit_register read function.
- *
- ******************************************************************************/
-acpi_status acpi_get_register(u32 register_id, u32 *return_value)
-{
- acpi_status status;
- acpi_cpu_flags flags;
-
- flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
- status = acpi_get_register_unlocked(register_id, return_value);
- acpi_os_release_lock(acpi_gbl_hardware_lock, flags);
+ ACPI_DEBUG_PRINT((ACPI_DB_IO,
+ "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n",
+ register_id, bit_reg_info->parent_register,
+ register_value, value));
- return (status);
+ *return_value = value;
+ return_ACPI_STATUS(AE_OK);
}
-ACPI_EXPORT_SYMBOL(acpi_get_register)
+ACPI_EXPORT_SYMBOL(acpi_read_bit_register)
/*******************************************************************************
*
- * FUNCTION: acpi_set_register
+ * FUNCTION: acpi_write_bit_register
*
- * PARAMETERS: register_id - ID of ACPI bit_register to access
- * Value - (only used on write) value to write to the
- * Register, NOT pre-normalized to the bit pos
+ * PARAMETERS: register_id - ID of ACPI Bit Register to access
+ * Value - Value to write to the register, in bit
+ * position zero. The bit is automaticallly
+ * shifted to the correct position.
*
* RETURN: Status
*
- * DESCRIPTION: ACPI Bit Register write function.
+ * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock
+ * since most operations require a read/modify/write sequence.
+ *
+ * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
+ * PM2 Control.
+ *
+ * Note that at this level, the fact that there may be actually two
+ * hardware registers (A and B - and B may not exist) is abstracted.
*
******************************************************************************/
-acpi_status acpi_set_register(u32 register_id, u32 value)
+acpi_status acpi_write_bit_register(u32 register_id, u32 value)
{
- u32 register_value = 0;
struct acpi_bit_register_info *bit_reg_info;
- acpi_status status;
acpi_cpu_flags lock_flags;
+ u32 register_value;
+ acpi_status status = AE_OK;
- ACPI_FUNCTION_TRACE_U32(acpi_set_register, register_id);
+ ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id);
/* Get the info structure corresponding to the requested ACPI Register */
bit_reg_info = acpi_hw_get_bit_register_info(register_id);
if (!bit_reg_info) {
- ACPI_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X",
- register_id));
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
- /* Always do a register read first so we can insert the new bits */
-
- status = acpi_hw_register_read(bit_reg_info->parent_register,
- ®ister_value);
- if (ACPI_FAILURE(status)) {
- goto unlock_and_exit;
- }
-
/*
- * Decode the Register ID
- * Register ID = [Register block ID] | [bit ID]
- *
- * Check bit ID to fine locate Register offset.
- * Check Mask to determine Register offset, and then read-write.
+ * At this point, we know that the parent register is one of the
+ * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control
*/
- switch (bit_reg_info->parent_register) {
- case ACPI_REGISTER_PM1_STATUS:
-
+ if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) {
/*
- * Status Registers are different from the rest. Clear by
- * writing 1, and writing 0 has no effect. So, the only relevant
- * information is the single bit we're interested in, all others should
- * be written as 0 so they will be left unchanged.
+ * 1) Case for PM1 Enable, PM1 Control, and PM2 Control
+ *
+ * Perform a register read to preserve the bits that we are not
+ * interested in
*/
- value = ACPI_REGISTER_PREPARE_BITS(value,
- bit_reg_info->bit_position,
- bit_reg_info->
- access_bit_mask);
- if (value) {
- status =
- acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
- (u16) value);
- register_value = 0;
- }
- break;
-
- case ACPI_REGISTER_PM1_ENABLE:
-
- ACPI_REGISTER_INSERT_VALUE(register_value,
- bit_reg_info->bit_position,
- bit_reg_info->access_bit_mask,
- value);
-
- status = acpi_hw_register_write(ACPI_REGISTER_PM1_ENABLE,
- (u16) register_value);
- break;
-
- case ACPI_REGISTER_PM1_CONTROL:
-
- /*
- * Write the PM1 Control register.
- * Note that at this level, the fact that there are actually TWO
- * registers (A and B - and B may not exist) is abstracted.
- */
- ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n",
- register_value));
-
- ACPI_REGISTER_INSERT_VALUE(register_value,
- bit_reg_info->bit_position,
- bit_reg_info->access_bit_mask,
- value);
-
- status = acpi_hw_register_write(ACPI_REGISTER_PM1_CONTROL,
- (u16) register_value);
- break;
-
- case ACPI_REGISTER_PM2_CONTROL:
-
- status = acpi_hw_register_read(ACPI_REGISTER_PM2_CONTROL,
+ status = acpi_hw_register_read(bit_reg_info->parent_register,
®ister_value);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
- ACPI_DEBUG_PRINT((ACPI_DB_IO,
- "PM2 control: Read %X from %8.8X%8.8X\n",
- register_value,
- ACPI_FORMAT_UINT64(acpi_gbl_FADT.
- xpm2_control_block.
- address)));
-
+ /*
+ * Insert the input bit into the value that was just read
+ * and write the register
+ */
ACPI_REGISTER_INSERT_VALUE(register_value,
bit_reg_info->bit_position,
bit_reg_info->access_bit_mask,
value);
- ACPI_DEBUG_PRINT((ACPI_DB_IO,
- "About to write %4.4X to %8.8X%8.8X\n",
- register_value,
- ACPI_FORMAT_UINT64(acpi_gbl_FADT.
- xpm2_control_block.
- address)));
+ status = acpi_hw_register_write(bit_reg_info->parent_register,
+ register_value);
+ } else {
+ /*
+ * 2) Case for PM1 Status
+ *
+ * The Status register is different from the rest. Clear an event
+ * by writing 1, writing 0 has no effect. So, the only relevant
+ * information is the single bit we're interested in, all others
+ * should be written as 0 so they will be left unchanged.
+ */
+ register_value = ACPI_REGISTER_PREPARE_BITS(value,
+ bit_reg_info->
+ bit_position,
+ bit_reg_info->
+ access_bit_mask);
- status = acpi_hw_register_write(ACPI_REGISTER_PM2_CONTROL,
- (u8) (register_value));
- break;
+ /* No need to write the register if value is all zeros */
- default:
- break;
+ if (register_value) {
+ status =
+ acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
+ register_value);
+ }
}
- unlock_and_exit:
-
- acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
-
- /* Normalize the value that was read */
+ ACPI_DEBUG_PRINT((ACPI_DB_IO,
+ "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n",
+ register_id, bit_reg_info->parent_register, value,
+ register_value));
- ACPI_DEBUG_EXEC(register_value =
- ((register_value & bit_reg_info->access_bit_mask) >>
- bit_reg_info->bit_position));
+unlock_and_exit:
- ACPI_DEBUG_PRINT((ACPI_DB_IO,
- "Set bits: %8.8X actual %8.8X register %X\n", value,
- register_value, bit_reg_info->parent_register));
+ acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
return_ACPI_STATUS(status);
}
-ACPI_EXPORT_SYMBOL(acpi_set_register)
+ACPI_EXPORT_SYMBOL(acpi_write_bit_register)
/*******************************************************************************
*
/* It must be of type Package */
- else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) {
+ else if (info->return_object->common.type != ACPI_TYPE_PACKAGE) {
ACPI_ERROR((AE_INFO,
"Sleep State return object is not a Package"));
status = AE_AML_OPERAND_TYPE;
/* The first two elements must both be of type Integer */
- else if ((ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[0])
+ else if (((info->return_object->package.elements[0])->common.type
!= ACPI_TYPE_INTEGER) ||
- (ACPI_GET_OBJECT_TYPE(info->return_object->package.elements[1])
+ ((info->return_object->package.elements[1])->common.type
!= ACPI_TYPE_INTEGER)) {
ACPI_ERROR((AE_INFO,
- "Sleep State return package elements are not both Integers (%s, %s)",
+ "Sleep State return package elements are not both Integers "
+ "(%s, %s)",
acpi_ut_get_object_type_name(info->return_object->
package.elements[0]),
acpi_ut_get_object_type_name(info->return_object->
projects / linux-2.6-omap-h63xx.git / blobdiff