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218 lines
6.9 KiB
C
218 lines
6.9 KiB
C
/** @file
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Copyright (c) 2017-2021, 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_SCMI_CLOCK_PROTOCOL_H_
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#define ARM_SCMI_CLOCK_PROTOCOL_H_
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#include <Protocol/ArmScmi.h>
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#define ARM_SCMI_CLOCK_PROTOCOL_GUID {\
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0x91ce67a8, 0xe0aa, 0x4012, {0xb9, 0x9f, 0xb6, 0xfc, 0xf3, 0x4, 0x8e, 0xaa} \
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}
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extern EFI_GUID gArmScmiClockProtocolGuid;
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// Message Type for clock management protocol.
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typedef enum {
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ScmiMessageIdClockAttributes = 0x3,
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ScmiMessageIdClockDescribeRates = 0x4,
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ScmiMessageIdClockRateSet = 0x5,
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ScmiMessageIdClockRateGet = 0x6,
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ScmiMessageIdClockConfigSet = 0x7
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} SCMI_MESSAGE_ID_CLOCK;
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typedef enum {
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ScmiClockRateFormatDiscrete, // Non-linear range.
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ScmiClockRateFormatLinear // Linear range.
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} SCMI_CLOCK_RATE_FORMAT;
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// Clock management protocol version.
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#define SCMI_CLOCK_PROTOCOL_VERSION 0x10000
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#define SCMI_CLOCK_PROTOCOL_PENDING_ASYNC_RATES_MASK 0xFFU
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#define SCMI_CLOCK_PROTOCOL_PENDING_ASYNC_RATES_SHIFT 16
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#define SCMI_CLOCK_PROTOCOL_NUM_CLOCKS_MASK 0xFFFFU
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/** Total number of pending asynchronous clock rates changes
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supported by the SCP, Attr Bits[23:16]
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*/
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#define SCMI_CLOCK_PROTOCOL_MAX_ASYNC_CLK_RATES(Attr) ( \
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(Attr >> SCMI_CLOCK_PROTOCOL_PENDING_ASYNC_RATES_SHIFT) && \
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SCMI_CLOCK_PROTOCOL_PENDING_ASYNC_RATES_MASK)
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// Total of clock devices supported by the SCP, Attr Bits[15:0]
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#define SCMI_CLOCK_PROTOCOL_TOTAL_CLKS(Attr) (Attr & SCMI_CLOCK_PROTOCOL_NUM_CLOCKS_MASK)
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#pragma pack(1)
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/* Depending on the format (linear/non-linear) supported by a clock device
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either Rate or Min/Max/Step triplet is valid.
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*/
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typedef struct {
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UINT64 Min;
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UINT64 Max;
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UINT64 Step;
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} SCMI_CLOCK_RATE_CONTINUOUS;
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typedef struct {
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UINT64 Rate;
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} SCMI_CLOCK_RATE_DISCRETE;
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typedef union {
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SCMI_CLOCK_RATE_CONTINUOUS ContinuousRate;
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SCMI_CLOCK_RATE_DISCRETE DiscreteRate;
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} SCMI_CLOCK_RATE;
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#pragma pack()
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typedef struct _SCMI_CLOCK_PROTOCOL SCMI_CLOCK_PROTOCOL;
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// Protocol Interface functions.
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/** Return version of the clock management protocol supported by SCP firmware.
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@param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.
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@param[out] Version Version of the supported SCMI Clock management protocol.
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@retval EFI_SUCCESS The version is returned.
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@retval EFI_DEVICE_ERROR SCP returns an SCMI error.
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@retval !(EFI_SUCCESS) Other errors.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *SCMI_CLOCK_GET_VERSION)(
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IN SCMI_CLOCK_PROTOCOL *This,
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OUT UINT32 *Version
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);
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/** Return total number of clock devices supported by the clock management
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protocol.
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@param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.
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@param[out] TotalClocks Total number of clocks supported.
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@retval EFI_SUCCESS Total number of clocks supported is returned.
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@retval EFI_DEVICE_ERROR SCP returns an SCMI error.
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@retval !(EFI_SUCCESS) Other errors.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *SCMI_CLOCK_GET_TOTAL_CLOCKS)(
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IN SCMI_CLOCK_PROTOCOL *This,
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OUT UINT32 *TotalClocks
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);
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/** Return attributes of a clock device.
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@param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.
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@param[in] ClockId Identifier for the clock device.
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@param[out] Enabled If TRUE, the clock device is enabled.
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@param[out] ClockAsciiName A NULL terminated ASCII string with the clock
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name, of up to 16 bytes.
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@retval EFI_SUCCESS Clock device attributes are returned.
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@retval EFI_DEVICE_ERROR SCP returns an SCMI error.
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@retval !(EFI_SUCCESS) Other errors.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *SCMI_CLOCK_GET_CLOCK_ATTRIBUTES)(
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IN SCMI_CLOCK_PROTOCOL *This,
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IN UINT32 ClockId,
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OUT BOOLEAN *Enabled,
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OUT CHAR8 *ClockAsciiName
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);
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/** Return list of rates supported by a given clock device.
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@param[in] This A pointer to SCMI_CLOCK_PROTOCOL Instance.
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@param[in] ClockId Identifier for the clock device.
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@param[out] Format ScmiClockRateFormatDiscrete: Clock device
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supports range of clock rates which are non-linear.
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ScmiClockRateFormatLinear: Clock device supports
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range of linear clock rates from Min to Max in steps.
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@param[out] TotalRates Total number of rates.
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@param[in,out] RateArraySize Size of the RateArray.
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@param[out] RateArray List of clock rates.
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@retval EFI_SUCCESS List of clock rates are returned.
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@retval EFI_DEVICE_ERROR SCP returns an SCMI error.
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@retval EFI_BUFFER_TOO_SMALL RateArraySize is too small for the result.
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It has been updated to the size needed.
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@retval !(EFI_SUCCESS) Other errors.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *SCMI_CLOCK_DESCRIBE_RATES)(
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IN SCMI_CLOCK_PROTOCOL *This,
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IN UINT32 ClockId,
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OUT SCMI_CLOCK_RATE_FORMAT *Format,
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OUT UINT32 *TotalRates,
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IN OUT UINT32 *RateArraySize,
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OUT SCMI_CLOCK_RATE *RateArray
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);
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/** Get clock rate.
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@param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.
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@param[in] ClockId Identifier for the clock device.
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@param[out] Rate Clock rate.
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@retval EFI_SUCCESS Clock rate is returned.
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@retval EFI_DEVICE_ERROR SCP returns an SCMI error.
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@retval !(EFI_SUCCESS) Other errors.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *SCMI_CLOCK_RATE_GET)(
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IN SCMI_CLOCK_PROTOCOL *This,
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IN UINT32 ClockId,
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OUT UINT64 *Rate
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);
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/** Set clock rate.
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@param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.
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@param[in] ClockId Identifier for the clock device.
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@param[in] Rate Clock rate.
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@retval EFI_SUCCESS Clock rate set success.
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@retval EFI_DEVICE_ERROR SCP returns an SCMI error.
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@retval !(EFI_SUCCESS) Other errors.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *SCMI_CLOCK_RATE_SET)(
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IN SCMI_CLOCK_PROTOCOL *This,
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IN UINT32 ClockId,
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IN UINT64 Rate
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);
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typedef struct _SCMI_CLOCK_PROTOCOL {
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SCMI_CLOCK_GET_VERSION GetVersion;
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SCMI_CLOCK_GET_TOTAL_CLOCKS GetTotalClocks;
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SCMI_CLOCK_GET_CLOCK_ATTRIBUTES GetClockAttributes;
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SCMI_CLOCK_DESCRIBE_RATES DescribeRates;
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SCMI_CLOCK_RATE_GET RateGet;
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SCMI_CLOCK_RATE_SET RateSet;
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} SCMI_CLOCK_PROTOCOL;
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#endif /* ARM_SCMI_CLOCK_PROTOCOL_H_ */
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