242 lines
6.7 KiB
C
242 lines
6.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Core ACPI (Advanced Configuration and Power Interface) support
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*
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* Copyright 2019 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef __DM_ACPI_H__
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#define __DM_ACPI_H__
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/* Allow operations to be optional for ACPI */
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#if CONFIG_IS_ENABLED(ACPIGEN)
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#define ACPI_OPS_PTR(_ptr) .acpi_ops = _ptr,
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#else
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#define ACPI_OPS_PTR(_ptr)
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#endif
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/* Length of an ACPI name string, excluding null terminator */
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#define ACPI_NAME_LEN 4
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/* Length of an ACPI name string including nul terminator */
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#define ACPI_NAME_MAX (ACPI_NAME_LEN + 1)
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/* Number of nested objects supported */
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#define ACPIGEN_LENSTACK_SIZE 10
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#if !defined(__ACPI__)
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struct nhlt;
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struct udevice;
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/** enum acpi_dump_option - selects what ACPI information to dump */
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enum acpi_dump_option {
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ACPI_DUMP_LIST, /* Just the list of items */
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ACPI_DUMP_CONTENTS, /* Include the binary contents also */
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};
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/**
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* struct acpi_ctx - Context used for writing ACPI tables
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*
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* This contains a few useful pieces of information used when writing
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*
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* @base: Base address of ACPI tables
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* @current: Current address for writing
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* @rsdp: Pointer to the Root System Description Pointer, typically used when
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* adding a new table. The RSDP holds pointers to the RSDT and XSDT.
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* @rsdt: Pointer to the Root System Description Table
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* @xsdt: Pointer to the Extended System Description Table
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* @nhlt: Intel Non-High-Definition-Audio Link Table (NHLT) pointer, used to
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* build up information that audio codecs need to provide in the NHLT ACPI
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* table
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* @len_stack: Stack of 'length' words to fix up later
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* @ltop: Points to current top of stack (0 = empty)
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*/
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struct acpi_ctx {
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void *base;
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void *current;
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struct acpi_rsdp *rsdp;
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struct acpi_rsdt *rsdt;
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struct acpi_xsdt *xsdt;
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struct nhlt *nhlt;
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char *len_stack[ACPIGEN_LENSTACK_SIZE];
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int ltop;
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};
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/**
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* struct acpi_ops - ACPI operations supported by driver model
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*/
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struct acpi_ops {
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/**
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* get_name() - Obtain the ACPI name of a device
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*
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* @dev: Device to check
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* @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
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* bytes
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* @return 0 if OK, -ENOENT if no name is available, other -ve value on
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* other error
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*/
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int (*get_name)(const struct udevice *dev, char *out_name);
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/**
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* write_tables() - Write out any tables required by this device
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*
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* @dev: Device to write
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* @ctx: ACPI context to use
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* @return 0 if OK, -ve on error
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*/
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int (*write_tables)(const struct udevice *dev, struct acpi_ctx *ctx);
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/**
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* fill_ssdt() - Generate SSDT code for a device
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*
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* This is called to create the SSDT code. The method should write out
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* whatever ACPI code is needed by this device. It will end up in the
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* SSDT table.
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*
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* Note that this is called 'fill' because the entire contents of the
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* SSDT is build by calling this method on all devices.
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*
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* @dev: Device to write
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* @ctx: ACPI context to use
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* @return 0 if OK, -ve on error
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*/
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int (*fill_ssdt)(const struct udevice *dev, struct acpi_ctx *ctx);
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/**
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* inject_dsdt() - Generate DSDT code for a device
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*
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* This is called to create the DSDT code. The method should write out
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* whatever ACPI code is needed by this device. It will end up in the
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* DSDT table.
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*
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* Note that this is called 'inject' because the output of calling this
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* method on all devices is injected into the DSDT, the bulk of which
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* is written in .asl files for the board.
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*
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* @dev: Device to write
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* @ctx: ACPI context to use
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* @return 0 if OK, -ve on error
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*/
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int (*inject_dsdt)(const struct udevice *dev, struct acpi_ctx *ctx);
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/**
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* setup_nhlt() - Set up audio information for this device
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*
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* The method can add information to ctx->nhlt if it likes
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*
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* @return 0 if OK, -ENODATA if nothing to add, -ve on error
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*/
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int (*setup_nhlt)(const struct udevice *dev, struct acpi_ctx *ctx);
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};
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#define device_get_acpi_ops(dev) ((dev)->driver->acpi_ops)
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/**
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* acpi_get_name() - Obtain the ACPI name of a device
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*
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* @dev: Device to check
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* @out_name: Place to put the name, must hold at least ACPI_NAME_MAX
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* bytes
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* @return 0 if OK, -ENOENT if no name is available, other -ve value on
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* other error
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*/
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int acpi_get_name(const struct udevice *dev, char *out_name);
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/**
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* acpi_copy_name() - Copy an ACPI name to an output buffer
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*
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* This convenience function can be used to return a literal string as a name
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* in functions that implement the get_name() method.
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*
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* For example:
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*
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* static int mydev_get_name(const struct udevice *dev, char *out_name)
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* {
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* return acpi_copy_name(out_name, "WIBB");
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* }
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*
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* @out_name: Place to put the name
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* @name: Name to copy
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* @return 0 (always)
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*/
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int acpi_copy_name(char *out_name, const char *name);
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/**
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* acpi_write_dev_tables() - Write ACPI tables required by devices
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*
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* This scans through all devices and tells them to write any tables they want
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* to write.
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*
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* @return 0 if OK, -ve if any device returned an error
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*/
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int acpi_write_dev_tables(struct acpi_ctx *ctx);
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/**
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* acpi_fill_ssdt() - Generate ACPI tables for SSDT
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*
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* This is called to create the SSDT code for all devices.
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*
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* @ctx: ACPI context to use
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* @return 0 if OK, -ve on error
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*/
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int acpi_fill_ssdt(struct acpi_ctx *ctx);
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/**
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* acpi_inject_dsdt() - Generate ACPI tables for DSDT
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*
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* This is called to create the DSDT code for all devices.
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*
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* @ctx: ACPI context to use
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* @return 0 if OK, -ve on error
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*/
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int acpi_inject_dsdt(struct acpi_ctx *ctx);
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/**
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* acpi_setup_nhlt() - Set up audio information
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*
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* This is called to set up the nhlt information for all devices.
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*
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* @ctx: ACPI context to use
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* @nhlt: Pointer to nhlt information to add to
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* @return 0 if OK, -ve on error
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*/
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int acpi_setup_nhlt(struct acpi_ctx *ctx, struct nhlt *nhlt);
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/**
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* acpi_dump_items() - Dump out the collected ACPI items
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*
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* This lists the ACPI DSDT and SSDT items generated by the various U-Boot
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* drivers.
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*
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* @option: Sets what should be dumpyed
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*/
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void acpi_dump_items(enum acpi_dump_option option);
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/**
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* acpi_get_path() - Get the full ACPI path for a device
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*
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* This checks for any override in the device tree and calls acpi_device_path()
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* if not
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*
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* @dev: Device to check
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* @out_path: Buffer to place the path in (should be ACPI_PATH_MAX long)
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* @maxlen: Size of buffer (typically ACPI_PATH_MAX)
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* @return 0 if OK, -ve on error
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*/
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int acpi_get_path(const struct udevice *dev, char *out_path, int maxlen);
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/**
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* acpi_reset_items() - Reset the list of ACPI items to empty
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*
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* This list keeps track of DSDT and SSDT items that are generated
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* programmatically. The 'acpi items' command shows the list. Use this function
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* to empty the list, before writing new items.
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*/
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void acpi_reset_items(void);
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#endif /* __ACPI__ */
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#endif
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