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131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/** @file
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Copyright (c) 2017-2018, Arm Limited. All rights reserved.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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System Control and Management Interface V1.0
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http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/
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DEN0056A_System_Control_and_Management_Interface.pdf
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**/
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#ifndef ARM_MTL_LIB_H_
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#define ARM_MTL_LIB_H_
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#include <Uefi/UefiBaseType.h>
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// Ideally we don't need packed struct. However we can't rely on compilers.
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#pragma pack(1)
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typedef struct {
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UINT32 Reserved1;
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UINT32 ChannelStatus;
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UINT64 Reserved2;
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UINT32 Flags;
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UINT32 Length;
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UINT32 MessageHeader;
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// NOTE: Since EDK2 does not allow flexible array member [] we declare
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// here array of 1 element length. However below is used as a variable
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// length array.
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UINT32 Payload[1]; // size less object gives offset to payload.
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} MTL_MAILBOX;
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#pragma pack()
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// Channel Type, Low-priority, and High-priority
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typedef enum {
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MTL_CHANNEL_TYPE_LOW = 0,
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MTL_CHANNEL_TYPE_HIGH = 1
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} MTL_CHANNEL_TYPE;
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typedef struct {
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UINT64 PhysicalAddress;
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UINT32 ModifyMask;
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UINT32 PreserveMask;
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} MTL_DOORBELL;
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typedef struct {
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MTL_CHANNEL_TYPE ChannelType;
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MTL_MAILBOX *CONST MailBox;
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MTL_DOORBELL DoorBell;
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} MTL_CHANNEL;
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/** Wait until channel is free.
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@param[in] Channel Pointer to a channel.
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@param[in] TimeOutInMicroSeconds Time out in micro seconds.
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@retval EFI_SUCCESS Channel is free.
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@retval EFI_TIMEOUT Time out error.
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**/
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EFI_STATUS
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MtlWaitUntilChannelFree (
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IN MTL_CHANNEL *Channel,
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IN UINTN TimeOutInMicroSeconds
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);
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/** Return the address of the message payload.
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@param[in] Channel Pointer to a channel.
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@retval UINT32* Pointer to the payload.
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**/
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UINT32 *
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MtlGetChannelPayload (
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IN MTL_CHANNEL *Channel
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);
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/** Return pointer to a channel for the requested channel type.
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@param[in] ChannelType ChannelType, Low or High priority channel.
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MTL_CHANNEL_TYPE_LOW or
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MTL_CHANNEL_TYPE_HIGH
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@param[out] Channel Holds pointer to the channel.
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@retval EFI_SUCCESS Pointer to channel is returned.
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@retval EFI_UNSUPPORTED Requested channel type not supported.
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**/
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EFI_STATUS
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MtlGetChannel (
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IN MTL_CHANNEL_TYPE ChannelType,
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OUT MTL_CHANNEL **Channel
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);
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/** Mark the channel busy and ring the doorbell.
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@param[in] Channel Pointer to a channel.
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@param[in] MessageHeader Message header.
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@param[out] PayloadLength Message length.
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@retval EFI_SUCCESS Message sent successfully.
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@retval EFI_DEVICE_ERROR Channel is busy.
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**/
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EFI_STATUS
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MtlSendMessage (
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IN MTL_CHANNEL *Channel,
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IN UINT32 MessageHeader,
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OUT UINT32 PayloadLength
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);
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/** Wait for a response on a channel.
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If channel is free after sending message, it implies SCP responded
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with a response on the channel.
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@param[in] Channel Pointer to a channel.
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@retval EFI_SUCCESS Message received successfully.
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@retval EFI_TIMEOUT Time out error.
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**/
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EFI_STATUS
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MtlReceiveMessage (
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IN MTL_CHANNEL *Channel,
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OUT UINT32 *MessageHeader,
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OUT UINT32 *PayloadLength
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);
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#endif /* ARM_MTL_LIB_H_ */
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