4f2494cf53
This change introduces a new SCMI protocol driver for Arm systems. The driver currently supports only clock and performance management protocols. Other protocols will be added as and when needed. Clock management protocol is used to configure various clocks available on the platform e.g. HDLCD clock on the Juno platforms. Whereas performance management protocol allows adjustment of various performance domains. Currently this is used to evaluate performance of the Juno platform. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Girish Pathak <girish.pathak@arm.com> Signed-off-by: Evan Lloyd <evan.lloyd@arm.com> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
/** @file
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Copyright (c) 2017-2018, Arm Limited. All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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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_SCMI_PERFORMANCE_PROTOCOL_PRIVATE_H_
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#define ARM_SCMI_PERFORMANCE_PROTOCOL_PRIVATE_H_
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#include <Protocol/ArmScmiPerformanceProtocol.h>
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// Number of performance levels returned by a call to the SCP, Lvls Bits[11:0]
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#define NUM_PERF_LEVELS_MASK 0x0FFF
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#define NUM_PERF_LEVELS(Lvls) (Lvls & NUM_PERF_LEVELS_MASK)
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// Number of performance levels remaining after a call to the SCP, Lvls Bits[31:16]
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#define NUM_REMAIN_PERF_LEVELS_SHIFT 16
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#define NUM_REMAIN_PERF_LEVELS(Lvls) (Lvls >> NUM_REMAIN_PERF_LEVELS_SHIFT)
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/** Return values for SCMI_MESSAGE_ID_PERFORMANCE_DESCRIBE_LEVELS command.
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SCMI Spec § 4.5.2.5
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**/
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typedef struct {
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UINT32 NumLevels;
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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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SCMI_PERFORMANCE_LEVEL PerfLevel[1]; // Offset to array of performance levels
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} PERF_DESCRIBE_LEVELS;
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/** Initialize performance management protocol and install on a given Handle.
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@param[in] Handle Handle to install performance management
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protocol.
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@retval EFI_SUCCESS Performance protocol installed successfully.
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**/
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EFI_STATUS
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ScmiPerformanceProtocolInit (
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IN EFI_HANDLE* Handle
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);
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#endif /* ARM_SCMI_PERFORMANCE_PROTOCOL_PRIVATE_H_ */
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