From: Sudeep Holla <sudeep.holla@xxxxxxx> ACPICA commit fad527b6e76babc7527c41325bfbef6bd1a1132b FFH(Fixed Function Hardware) Opregion is approved to be added in ACPI 6.5 via code first approach [1]. It requires special context data similar to GPIO and Generic Serial Bus as it needs to know platform specific offset and length. Add support for the special context data needed by FFH Opregion. FFH op_region enables advanced use of FFH on some architectures. For example, it could be used to easily proxy AML code to architecture-specific behavior (to ensure it is OS initiated) Actual behavior of FFH is ofcourse architecture specific and depends on the FFH bindings. The offset and length could have arch specific meaning or usage. Link: https://bugzilla.tianocore.org/show_bug.cgi?id=3598 # [1] Link: https://github.com/acpica/acpica/commit/fad527b6 Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx> Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> --- drivers/acpi/acpica/evregion.c | 9 +++++++++ drivers/acpi/acpica/exfield.c | 8 ++++++-- drivers/acpi/acpica/exserial.c | 6 ++++++ include/acpi/acconfig.h | 2 ++ include/acpi/actypes.h | 7 +++++++ 5 files changed, 30 insertions(+), 2 deletions(-) Index: linux-pm/drivers/acpi/acpica/evregion.c =================================================================== --- linux-pm.orig/drivers/acpi/acpica/evregion.c +++ linux-pm/drivers/acpi/acpica/evregion.c @@ -172,6 +172,15 @@ acpi_ev_address_space_dispatch(union acp ctx->subspace_id = (u8)region_obj->region.address; } + if (region_obj->region.space_id == + ACPI_ADR_SPACE_FIXED_HARDWARE) { + struct acpi_ffh_info *ctx = + handler_desc->address_space.context; + + ctx->length = region_obj->region.length; + ctx->offset = region_obj->region.address; + } + /* * We must exit the interpreter because the region setup will * potentially execute control methods (for example, the _REG method Index: linux-pm/drivers/acpi/acpica/exfield.c =================================================================== --- linux-pm.orig/drivers/acpi/acpica/exfield.c +++ linux-pm/drivers/acpi/acpica/exfield.c @@ -141,7 +141,9 @@ acpi_ex_read_data_from_field(struct acpi || obj_desc->field.region_obj->region.space_id == ACPI_ADR_SPACE_IPMI || obj_desc->field.region_obj->region.space_id == - ACPI_ADR_SPACE_PLATFORM_RT)) { + ACPI_ADR_SPACE_PLATFORM_RT + || obj_desc->field.region_obj->region.space_id == + ACPI_ADR_SPACE_FIXED_HARDWARE)) { /* SMBus, GSBus, IPMI serial */ @@ -305,7 +307,9 @@ acpi_ex_write_data_to_field(union acpi_o || obj_desc->field.region_obj->region.space_id == ACPI_ADR_SPACE_IPMI || obj_desc->field.region_obj->region.space_id == - ACPI_ADR_SPACE_PLATFORM_RT)) { + ACPI_ADR_SPACE_PLATFORM_RT + || obj_desc->field.region_obj->region.space_id == + ACPI_ADR_SPACE_FIXED_HARDWARE)) { /* SMBus, GSBus, IPMI serial */ Index: linux-pm/drivers/acpi/acpica/exserial.c =================================================================== --- linux-pm.orig/drivers/acpi/acpica/exserial.c +++ linux-pm/drivers/acpi/acpica/exserial.c @@ -323,6 +323,12 @@ acpi_ex_write_serial_bus(union acpi_oper function = ACPI_WRITE; break; + case ACPI_ADR_SPACE_FIXED_HARDWARE: + + buffer_length = ACPI_FFH_INPUT_BUFFER_SIZE; + function = ACPI_WRITE; + break; + default: return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID); } Index: linux-pm/include/acpi/acconfig.h =================================================================== --- linux-pm.orig/include/acpi/acconfig.h +++ linux-pm/include/acpi/acconfig.h @@ -190,6 +190,8 @@ #define ACPI_PRM_INPUT_BUFFER_SIZE 26 +#define ACPI_FFH_INPUT_BUFFER_SIZE 256 + /* _sx_d and _sx_w control methods */ #define ACPI_NUM_sx_d_METHODS 4 Index: linux-pm/include/acpi/actypes.h =================================================================== --- linux-pm.orig/include/acpi/actypes.h +++ linux-pm/include/acpi/actypes.h @@ -1116,6 +1116,13 @@ struct acpi_pcc_info { u8 *internal_buffer; }; +/* Special Context data for FFH Opregion (ACPI 6.5) */ + +struct acpi_ffh_info { + u64 offset; + u64 length; +}; + typedef acpi_status (*acpi_adr_space_setup) (acpi_handle region_handle, u32 function,
