/** @file
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Device driver for the Atmel ATSHA204A random number generator.
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Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _ATSHA204A_I2C_HWRNG_DRIVER_H_
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#define _ATSHA204A_I2C_HWRNG_DRIVER_H_
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#include <Uefi.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiLib.h>
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#include <Protocol/Rng.h>
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#include <Protocol/I2cIo.h>
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#define ATSHA204A_OUTPUT_SIZE 32
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#define ATSHA204A_DEV_SIGNATURE SIGNATURE_32('a','t','s','h')
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typedef struct {
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UINT32 Signature;
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EFI_I2C_IO_PROTOCOL *I2cIo;
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EFI_RNG_PROTOCOL Rng;
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} ATSHA204A_DEV;
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#define ATSHA204A_DEV_FROM_THIS(a) \
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CR(a, ATSHA204A_DEV, Rng, ATSHA204A_DEV_SIGNATURE)
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#pragma pack(1)
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typedef struct {
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UINT8 Command;
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UINT8 Count;
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UINT8 Opcode;
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UINT8 Param1;
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UINT16 Param2;
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UINT16 Crc;
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} ATSHA204A_I2C_RNG_COMMAND;
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typedef struct {
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UINT8 Count;
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UINT8 Result[ATSHA204A_OUTPUT_SIZE];
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UINT16 Crc;
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} ATSHA204A_I2C_RNG_RESULT;
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#pragma pack()
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typedef struct {
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UINTN OperationCount;
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EFI_I2C_OPERATION Operation;
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} I2C_RNG_REQUEST;
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#define ATSHA204A_COMMAND 0x3
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#define ATSHA204A_OPCODE_RANDOM 0x1b
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extern EFI_COMPONENT_NAME2_PROTOCOL gAtSha204aDriverComponentName2;
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EFI_STATUS
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AtSha204aInit (
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IN EFI_HANDLE DriverBindingHandle,
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IN EFI_HANDLE ControllerHandle
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);
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EFI_STATUS
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AtSha204aRelease (
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IN EFI_HANDLE DriverBindingHandle,
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IN EFI_HANDLE ControllerHandle
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);
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#endif // _ATSHA204A_I2C_HWRNG_DRIVER_H_
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