[PATCH 03/18] ACPICA: Hardware: Add access_width/bit_offset support in acpi_hw_write()
From: Lv Zheng
Date: Wed Dec 28 2016 - 02:31:24 EST
ACPICA commit 1ecab20bbe69a176dfb6da7210fe77aa6b3ad680
This patch adds access_width/bit_offset support in acpi_hw_write().
Lv Zheng.
Link: https://github.com/acpica/acpica/commit/1ecab20b
Signed-off-by: Lv Zheng <lv.zheng@xxxxxxxxx>
Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx>
---
drivers/acpi/acpica/hwregs.c | 62 +++++++++++++++++++++++++++++++++++++-------
1 file changed, 53 insertions(+), 9 deletions(-)
diff --git a/drivers/acpi/acpica/hwregs.c b/drivers/acpi/acpica/hwregs.c
index 115c223..2bc3425 100644
--- a/drivers/acpi/acpica/hwregs.c
+++ b/drivers/acpi/acpica/hwregs.c
@@ -292,6 +292,12 @@ 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 value32;
+ u8 index;
acpi_status status;
ACPI_FUNCTION_NAME(hw_write);
@@ -303,23 +309,61 @@ 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 */
-
- status = acpi_hw_write_port((acpi_io_address)
- address, value, reg->bit_width);
+ 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().
+ */
+ 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 {
+ if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
+ value64 = (u64)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 */
+
+ status = acpi_hw_write_port((acpi_io_address)
+ address +
+ index *
+ ACPI_DIV_8
+ (access_width),
+ 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);
--
2.7.4