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/** @file
Device driver for the Atmel ATSHA204A random number generator.
Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD
License which accompanies this distribution. The full text of the license may
be found at http://opensource.org/licenses/bsd-license.php.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#ifndef _ATSHA204A_I2C_HWRNG_DRIVER_H_
#define _ATSHA204A_I2C_HWRNG_DRIVER_H_
#include <Uefi.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Protocol/Rng.h>
#include <Protocol/I2cIo.h>
#define ATSHA204A_OUTPUT_SIZE 32
#define ATSHA204A_DEV_SIGNATURE SIGNATURE_32('a','t','s','h')
typedef struct {
UINT32 Signature;
EFI_I2C_IO_PROTOCOL *I2cIo;
EFI_RNG_PROTOCOL Rng;
} ATSHA204A_DEV;
#define ATSHA204A_DEV_FROM_THIS(a) \
CR(a, ATSHA204A_DEV, Rng, ATSHA204A_DEV_SIGNATURE)
#pragma pack(1)
typedef struct {
UINT8 Command;
UINT8 Count;
UINT8 Opcode;
UINT8 Param1;
UINT16 Param2;
UINT16 Crc;
} ATSHA204A_I2C_RNG_COMMAND;
typedef struct {
UINT8 Count;
UINT8 Result[ATSHA204A_OUTPUT_SIZE];
UINT16 Crc;
} ATSHA204A_I2C_RNG_RESULT;
#pragma pack()
typedef struct {
UINTN OperationCount;
EFI_I2C_OPERATION Operation;
} I2C_RNG_REQUEST;
#define ATSHA204A_COMMAND 0x3
#define ATSHA204A_OPCODE_RANDOM 0x1b
extern EFI_COMPONENT_NAME2_PROTOCOL gAtSha204aDriverComponentName2;
EFI_STATUS
AtSha204aInit (
IN EFI_HANDLE DriverBindingHandle,
IN EFI_HANDLE ControllerHandle
);
EFI_STATUS
AtSha204aRelease (
IN EFI_HANDLE DriverBindingHandle,
IN EFI_HANDLE ControllerHandle
);
#endif // _ATSHA204A_I2C_HWRNG_DRIVER_H_
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