288 lines
8.8 KiB
C
288 lines
8.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Device properties, a temporary data structure for adding to ACPI code
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*
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* Copyright 2019 Google LLC
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* Mostly taken from coreboot file acpi_device.h
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*/
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#ifndef __ACPI_DP_H
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#define __ACPI_DP_H
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struct acpi_ctx;
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#include <acpi/acpi_device.h>
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/*
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* Writing Device Properties objects via _DSD
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*
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* This is described in ACPI 6.3 section 6.2.5
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*
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* This provides a structure to handle nested device-specific data which ends
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* up in a _DSD table.
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*
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* https://www.kernel.org/doc/html/latest/firmware-guide/acpi/DSD-properties-rules.html
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* https://uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf
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* https://uefi.org/sites/default/files/resources/_DSD-hierarchical-data-extension-UUID-v1.1.pdf
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*
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* The Device Property Hierarchy can be multiple levels deep with multiple
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* children possible in each level. In order to support this flexibility
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* the device property hierarchy must be built up before being written out.
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*
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* For example:
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*
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* Child table with string and integer:
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* struct acpi_dp *child = acpi_dp_new_table("CHLD");
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* acpi_dp_add_string(child, "childstring", "CHILD");
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* acpi_dp_add_integer(child, "childint", 100);
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*
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* _DSD table with integer and gpio and child pointer:
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* struct acpi_dp *dsd = acpi_dp_new_table("_DSD");
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* acpi_dp_add_integer(dsd, "number1", 1);
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* acpi_dp_add_gpio(dsd, "gpio", "\_SB.PCI0.GPIO", 0, 0, 1);
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* acpi_dp_add_child(dsd, "child", child);
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*
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* Write entries into SSDT and clean up resources:
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* acpi_dp_write(dsd);
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*
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* Name(_DSD, Package() {
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* ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301")
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* Package() {
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* Package() { "gpio", Package() { \_SB.PCI0.GPIO, 0, 0, 0 } }
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* Package() { "number1", 1 }
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* }
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* ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b")
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* Package() {
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* Package() { "child", CHLD }
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* }
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* }
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* Name(CHLD, Package() {
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* ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301")
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* Package() {
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* Package() { "childstring", "CHILD" }
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* Package() { "childint", 100 }
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* }
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* }
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*/
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#define ACPI_DP_UUID "daffd814-6eba-4d8c-8a91-bc9bbf4aa301"
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#define ACPI_DP_CHILD_UUID "dbb8e3e6-5886-4ba6-8795-1319f52a966b"
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/**
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* enum acpi_dp_type - types of device property objects
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*
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* These refer to the types defined by struct acpi_dp below
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*
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* @ACPI_DP_TYPE_UNKNOWN: Unknown / do not use
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* @ACPI_DP_TYPE_INTEGER: Integer value (u64) in @integer
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* @ACPI_DP_TYPE_STRING: String value in @string
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* @ACPI_DP_TYPE_REFERENCE: Reference to another object, with value in @string
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* @ACPI_DP_TYPE_TABLE: Type for a top-level table which may have children
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* @ACPI_DP_TYPE_ARRAY: Array of items with first item in @array and following
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* items linked from that item's @next
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* @ACPI_DP_TYPE_CHILD: Child object, with siblings in that child's @next
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*/
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enum acpi_dp_type {
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ACPI_DP_TYPE_UNKNOWN,
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ACPI_DP_TYPE_INTEGER,
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ACPI_DP_TYPE_STRING,
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ACPI_DP_TYPE_REFERENCE,
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ACPI_DP_TYPE_TABLE,
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ACPI_DP_TYPE_ARRAY,
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ACPI_DP_TYPE_CHILD,
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};
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/**
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* struct acpi_dp - ACPI device properties
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*
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* @type: Table type
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* @name: Name of object, typically _DSD but could be CHLD for a child object.
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* This can be NULL if there is no name
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* @next: Next object in list (next array element or next sibling)
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* @child: Pointer to first child, if @type == ACPI_DP_TYPE_CHILD, else NULL
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* @array: First array element, if @type == ACPI_DP_TYPE_ARRAY, else NULL
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* @integer: Integer value of the property, if @type == ACPI_DP_TYPE_INTEGER
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* @string: String value of the property, if @type == ACPI_DP_TYPE_STRING;
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* child name if @type == ACPI_DP_TYPE_CHILD;
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* reference name if @type == ACPI_DP_TYPE_REFERENCE;
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*/
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struct acpi_dp {
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enum acpi_dp_type type;
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const char *name;
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struct acpi_dp *next;
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union {
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struct acpi_dp *child;
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struct acpi_dp *array;
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};
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union {
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u64 integer;
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const char *string;
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};
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};
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/**
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* acpi_dp_new_table() - Start a new Device Property table
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*
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* @ref: ACPI reference (e.g. "_DSD")
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* @return pointer to table, or NULL if out of memory
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*/
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struct acpi_dp *acpi_dp_new_table(const char *ref);
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/**
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* acpi_dp_add_integer() - Add integer Device Property
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*
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* A new node is added to the end of the property list of @dp
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*
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* @dp: Table to add this property to
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* @name: Name of property, or NULL for none
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* @value: Integer value
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* @return pointer to new node, or NULL if out of memory
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*/
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struct acpi_dp *acpi_dp_add_integer(struct acpi_dp *dp, const char *name,
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u64 value);
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/**
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* acpi_dp_add_string() - Add string Device Property
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*
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* A new node is added to the end of the property list of @dp
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*
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* @dp: Table to add this property to
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* @name: Name of property, or NULL for none
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* @string: String value
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* @return pointer to new node, or NULL if out of memory
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*/
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struct acpi_dp *acpi_dp_add_string(struct acpi_dp *dp, const char *name,
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const char *string);
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/**
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* acpi_dp_add_reference() - Add reference Device Property
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*
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* A new node is added to the end of the property list of @dp
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*
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* @dp: Table to add this property to
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* @name: Name of property, or NULL for none
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* @reference: Reference value
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* @return pointer to new node, or NULL if out of memory
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*/
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struct acpi_dp *acpi_dp_add_reference(struct acpi_dp *dp, const char *name,
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const char *reference);
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/**
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* acpi_dp_add_array() - Add array Device Property
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*
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* A new node is added to the end of the property list of @dp, with the array
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* attached to that.
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*
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* @dp: Table to add this property to
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* @name: Name of property, or NULL for none
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* @return pointer to new node, or NULL if out of memory
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*/
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struct acpi_dp *acpi_dp_add_array(struct acpi_dp *dp, struct acpi_dp *array);
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/**
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* acpi_dp_add_integer_array() - Add an array of integers
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*
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* A new node is added to the end of the property list of @dp, with the array
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* attached to that. Each element of the array becomes a new node.
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*
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* @dp: Table to add this property to
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* @name: Name of property, or NULL for none
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* @return pointer to new array node, or NULL if out of memory
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*/
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struct acpi_dp *acpi_dp_add_integer_array(struct acpi_dp *dp, const char *name,
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u64 *array, int len);
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/**
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* acpi_dp_add_child() - Add a child table of Device Properties
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*
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* A new node is added as a child of @dp
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*
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* @dp: Table to add this child to
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* @name: Name of child, or NULL for none
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* @child: Child node to add
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* @return pointer to new child node, or NULL if out of memory
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*/
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struct acpi_dp *acpi_dp_add_child(struct acpi_dp *dp, const char *name,
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struct acpi_dp *child);
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/**
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* acpi_dp_add_gpio() - Add a GPIO to a list of Device Properties
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*
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* A new node is added to the end of the property list of @dp, with the
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* GPIO properties added to the the new node
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*
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* @dp: Table to add this property to
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* @name: Name of property
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* @ref: Reference to device with a _CRS containing GpioIO or GpioInt
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* @index: Index of the GPIO resource in _CRS starting from zero
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* @pin: Pin in the GPIO resource, typically zero
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* @polarity: GPIO polarity. Note that ACPI_IRQ_ACTIVE_BOTH is not supported
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* @return pointer to new node, or NULL if out of memory
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*/
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struct acpi_dp *acpi_dp_add_gpio(struct acpi_dp *dp, const char *name,
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const char *ref, int index, int pin,
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enum acpi_gpio_polarity polarity);
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/**
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* acpi_dp_write() - Write Device Property hierarchy and clean up resources
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*
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* This writes the table using acpigen and then frees it
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*
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* @ctx: ACPI context
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* @table: Table to write
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* @return 0 if OK, -ve on error
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*/
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int acpi_dp_write(struct acpi_ctx *ctx, struct acpi_dp *table);
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/**
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* acpi_dp_ofnode_copy_int() - Copy a property from device tree to DP
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*
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* This copies an integer property from the device tree to the ACPI DP table.
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*
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* @node: Node to copy from
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* @dp: DP to copy to
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* @prop: Property name to copy
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* @return 0 if OK, -ve on error
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*/
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int acpi_dp_ofnode_copy_int(ofnode node, struct acpi_dp *dp, const char *prop);
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/**
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* acpi_dp_ofnode_copy_str() - Copy a property from device tree to DP
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*
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* This copies a string property from the device tree to the ACPI DP table.
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*
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* @node: Node to copy from
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* @dp: DP to copy to
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* @prop: Property name to copy
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* @return 0 if OK, -ve on error
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*/
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int acpi_dp_ofnode_copy_str(ofnode node, struct acpi_dp *dp, const char *prop);
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/**
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* acpi_dp_dev_copy_int() - Copy a property from device tree to DP
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*
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* This copies an integer property from the device tree to the ACPI DP table.
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*
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* @dev: Device to copy from
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* @dp: DP to copy to
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* @prop: Property name to copy
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* @return 0 if OK, -ve on error
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*/
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int acpi_dp_dev_copy_int(const struct udevice *dev, struct acpi_dp *dp,
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const char *prop);
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/**
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* acpi_dp_dev_copy_str() - Copy a property from device tree to DP
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*
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* This copies a string property from the device tree to the ACPI DP table.
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*
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* @dev: Device to copy from
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* @dp: DP to copy to
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* @prop: Property name to copy
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* @return 0 if OK, -ve on error
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*/
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int acpi_dp_dev_copy_str(const struct udevice *dev, struct acpi_dp *dp,
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const char *prop);
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#endif
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