acpi_status acpi_hw_write(u32 value, struct acpi_generic_address *reg)
{
u64 address;
- u8 access_width;
- u32 bit_width;
- u8 bit_offset;
- u64 value64;
- u32 new_value32, old_value32;
- u8 index;
acpi_status status;
ACPI_FUNCTION_NAME(hw_write);
return (status);
}
- /* Convert access_width into number of bits based */
-
- access_width = acpi_hw_get_access_bit_width(reg, 32);
- bit_width = reg->bit_offset + reg->bit_width;
- bit_offset = reg->bit_offset;
-
/*
* Two address spaces supported: Memory or IO. PCI_Config is
* not supported here because the GAS structure is insufficient
*/
- index = 0;
- while (bit_width) {
- /*
- * Use offset style bit reads because "Index * AccessWidth" is
- * ensured to be less than 32-bits by acpi_hw_validate_register().
- */
- new_value32 = ACPI_GET_BITS(&value, index * access_width,
- ACPI_MASK_BITS_ABOVE_32
- (access_width));
-
- if (bit_offset >= access_width) {
- bit_offset -= access_width;
- } else {
- /*
- * Use offset style bit masks because access_width is ensured
- * to be less than 32-bits by acpi_hw_validate_register() and
- * bit_offset/bit_width is less than access_width here.
- */
- if (bit_offset) {
- new_value32 &= ACPI_MASK_BITS_BELOW(bit_offset);
- }
- if (bit_width < access_width) {
- new_value32 &= ACPI_MASK_BITS_ABOVE(bit_width);
- }
-
- if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
- if (bit_offset || bit_width < access_width) {
- /*
- * Read old values in order not to modify the bits that
- * are beyond the register bit_width/bit_offset setting.
- */
- status =
- acpi_os_read_memory((acpi_physical_address)
- address +
- index *
- ACPI_DIV_8
- (access_width),
- &value64,
- access_width);
- old_value32 = (u32)value64;
-
- /*
- * Use offset style bit masks because access_width is
- * ensured to be less than 32-bits by
- * acpi_hw_validate_register() and bit_offset/bit_width is
- * less than access_width here.
- */
- if (bit_offset) {
- old_value32 &=
- ACPI_MASK_BITS_ABOVE
- (bit_offset);
- bit_offset = 0;
- }
- if (bit_width < access_width) {
- old_value32 &=
- ACPI_MASK_BITS_BELOW
- (bit_width);
- }
-
- new_value32 |= old_value32;
- }
-
- value64 = (u64)new_value32;
- status =
- acpi_os_write_memory((acpi_physical_address)
- address +
- index *
- ACPI_DIV_8
- (access_width),
- value64, access_width);
- } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
-
- if (bit_offset || bit_width < access_width) {
- /*
- * Read old values in order not to modify the bits that
- * are beyond the register bit_width/bit_offset setting.
- */
- status =
- acpi_hw_read_port((acpi_io_address)
- address +
- index *
- ACPI_DIV_8
- (access_width),
- &old_value32,
- access_width);
-
- /*
- * Use offset style bit masks because access_width is
- * ensured to be less than 32-bits by
- * acpi_hw_validate_register() and bit_offset/bit_width is
- * less than access_width here.
- */
- if (bit_offset) {
- old_value32 &=
- ACPI_MASK_BITS_ABOVE
- (bit_offset);
- bit_offset = 0;
- }
- if (bit_width < access_width) {
- old_value32 &=
- ACPI_MASK_BITS_BELOW
- (bit_width);
- }
-
- new_value32 |= old_value32;
- }
-
- status = acpi_hw_write_port((acpi_io_address)
- address +
- index *
- ACPI_DIV_8
- (access_width),
- new_value32,
- access_width);
- }
- }
-
- /*
- * Index * access_width is ensured to be less than 32-bits by
- * acpi_hw_validate_register().
- */
- bit_width -=
- bit_width > access_width ? access_width : bit_width;
- index++;
+ if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
+ status = acpi_os_write_memory((acpi_physical_address)
+ address, (u64)value,
+ reg->bit_width);
+ } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
+
+ status = acpi_hw_write_port((acpi_io_address)
+ address, value, reg->bit_width);
}
ACPI_DEBUG_PRINT((ACPI_DB_IO,
"Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n",
- value, access_width, ACPI_FORMAT_UINT64(address),
+ value, reg->bit_width, ACPI_FORMAT_UINT64(address),
acpi_ut_get_region_name(reg->space_id)));
return (status);
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