system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-11-05 18:23:50 +00:00
Code Issues Projects Releases Packages Wiki Activity

ACPICA: ACPI 2.0, Hardware: Add access_width/bit_offset support for acpi_hw_write()

Browse source 
ACPICA commit 48eea5e7993ccb7189bd63cd726e02adafee6057

This patch adds access_width/bit_offset support in acpi_hw_write().
Lv Zheng.

Link: https://github.com/acpica/acpica/commit/48eea5e7
Link: https://bugs.acpica.org/show_bug.cgi?id=1240
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lv Zheng 2016-05-05 13:00:29 +08:00 committed by Rafael J. Wysocki
parent c3bc26d4b4
commit 66b1ed5aa8
1 changed files with 136 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

144
drivers/acpi/acpica/hwregs.c
View file

@ -311,6 +311,12 @@ acpi_status acpi_hw_read(u32 *value, struct acpi_generic_address *reg)
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);
@ -322,23 +328,145 @@ acpi_status acpi_hw_write(u32 value, struct acpi_generic_address *reg)
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
*/
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 */
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));
status = acpi_hw_write_port((acpi_io_address)
address, value, reg->bit_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++;
}
ACPI_DEBUG_PRINT((ACPI_DB_IO,
"Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n",
value, reg->bit_width, ACPI_FORMAT_UINT64(address),
value, access_width, ACPI_FORMAT_UINT64(address),
acpi_ut_get_region_name(reg->space_id)));
return (status);