/** @file
  The NvmExpressPei driver is used to manage non-volatile memory subsystem
  which follows NVM Express specification at PEI phase.

  Copyright (c) 2018, Intel Corporation. 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 _NVM_EXPRESS_PEI_HCI_H_
#define _NVM_EXPRESS_PEI_HCI_H_

//
// NVME host controller registers operation definitions
//
#define NVME_GET_CAP(Private, Cap)             NvmeMmioRead  (Cap, Private->MmioBase + NVME_CAP_OFFSET, sizeof (NVME_CAP))
#define NVME_GET_CC(Private, Cc)               NvmeMmioRead  (Cc, Private->MmioBase + NVME_CC_OFFSET, sizeof (NVME_CC))
#define NVME_SET_CC(Private, Cc)               NvmeMmioWrite (Private->MmioBase + NVME_CC_OFFSET, Cc, sizeof (NVME_CC))
#define NVME_GET_CSTS(Private, Csts)           NvmeMmioRead  (Csts, Private->MmioBase + NVME_CSTS_OFFSET, sizeof (NVME_CSTS))
#define NVME_GET_AQA(Private, Aqa)             NvmeMmioRead  (Aqa, Private->MmioBase + NVME_AQA_OFFSET, sizeof (NVME_AQA))
#define NVME_SET_AQA(Private, Aqa)             NvmeMmioWrite (Private->MmioBase + NVME_AQA_OFFSET, Aqa, sizeof (NVME_AQA))
#define NVME_GET_ASQ(Private, Asq)             NvmeMmioRead  (Asq, Private->MmioBase + NVME_ASQ_OFFSET, sizeof (NVME_ASQ))
#define NVME_SET_ASQ(Private, Asq)             NvmeMmioWrite (Private->MmioBase + NVME_ASQ_OFFSET, Asq, sizeof (NVME_ASQ))
#define NVME_GET_ACQ(Private, Acq)             NvmeMmioRead  (Acq, Private->MmioBase + NVME_ACQ_OFFSET, sizeof (NVME_ACQ))
#define NVME_SET_ACQ(Private, Acq)             NvmeMmioWrite (Private->MmioBase + NVME_ACQ_OFFSET, Acq, sizeof (NVME_ACQ))
#define NVME_GET_VER(Private, Ver)             NvmeMmioRead  (Ver, Private->MmioBase + NVME_VER_OFFSET, sizeof (NVME_VER))
#define NVME_SET_SQTDBL(Private, Qid, Sqtdbl)  NvmeMmioWrite (Private->MmioBase + NVME_SQTDBL_OFFSET(Qid, Private->Cap.Dstrd), Sqtdbl, sizeof (NVME_SQTDBL))
#define NVME_SET_CQHDBL(Private, Qid, Cqhdbl)  NvmeMmioWrite (Private->MmioBase + NVME_CQHDBL_OFFSET(Qid, Private->Cap.Dstrd), Cqhdbl, sizeof (NVME_CQHDBL))

//
// Base memory address enum types
//
enum {
  BASEMEM_ASQ,
  BASEMEM_ACQ,
  BASEMEM_SQ,
  BASEMEM_CQ,
  BASEMEM_PRP,
  MAX_BASEMEM_COUNT
};

//
// All of base memories are 4K(0x1000) alignment
//
#define ALIGN(v, a)                          (UINTN)((((v) - 1) | ((a) - 1)) + 1)
#define NVME_MEM_BASE(Private)               ((UINTN)(Private->Buffer))
#define NVME_ASQ_BASE(Private)               (ALIGN (NVME_MEM_BASE(Private) + ((NvmeBaseMemPageOffset (BASEMEM_ASQ))                                * EFI_PAGE_SIZE), EFI_PAGE_SIZE))
#define NVME_ACQ_BASE(Private)               (ALIGN (NVME_MEM_BASE(Private) + ((NvmeBaseMemPageOffset (BASEMEM_ACQ))                                * EFI_PAGE_SIZE), EFI_PAGE_SIZE))
#define NVME_SQ_BASE(Private, Index)         (ALIGN (NVME_MEM_BASE(Private) + ((NvmeBaseMemPageOffset (BASEMEM_SQ) + ((Index)*(NVME_MAX_QUEUES-1))) * EFI_PAGE_SIZE), EFI_PAGE_SIZE))
#define NVME_CQ_BASE(Private, Index)         (ALIGN (NVME_MEM_BASE(Private) + ((NvmeBaseMemPageOffset (BASEMEM_CQ) + ((Index)*(NVME_MAX_QUEUES-1))) * EFI_PAGE_SIZE), EFI_PAGE_SIZE))
#define NVME_PRP_BASE(Private)               (ALIGN (NVME_MEM_BASE(Private) + ((NvmeBaseMemPageOffset (BASEMEM_PRP))                                * EFI_PAGE_SIZE), EFI_PAGE_SIZE))


/**
  Transfer MMIO Data to memory.

  @param[in,out] MemBuffer    Destination: Memory address.
  @param[in] MmioAddr         Source: MMIO address.
  @param[in] Size             Size for read.

  @retval EFI_SUCCESS         MMIO read sucessfully.

**/
EFI_STATUS
NvmeMmioRead (
  IN OUT VOID *MemBuffer,
  IN     UINTN MmioAddr,
  IN     UINTN Size
  );

/**
  Transfer memory data to MMIO.

  @param[in,out] MmioAddr    Destination: MMIO address.
  @param[in] MemBuffer       Source: Memory address.
  @param[in] Size            Size for write.

  @retval EFI_SUCCESS        MMIO write sucessfully.

**/
EFI_STATUS
NvmeMmioWrite (
  IN OUT UINTN MmioAddr,
  IN     VOID *MemBuffer,
  IN     UINTN Size
  );

/**
  Get the page offset for specific NVME based memory.

  @param[in] BaseMemIndex    The Index of BaseMem (0-based).

  @retval - The page count for specific BaseMem Index

**/
UINT32
NvmeBaseMemPageOffset (
  IN UINTN              BaseMemIndex
  );

/**
  Disable the Nvm Express controller.

  @param[in] Private     The pointer to the PEI_NVME_CONTROLLER_PRIVATE_DATA data structure.

  @return EFI_SUCCESS    Successfully disable the controller.
  @return others         Fail to disable the controller.

**/
EFI_STATUS
NvmeDisableController (
  IN PEI_NVME_CONTROLLER_PRIVATE_DATA    *Private
  );

/**
  Initialize the Nvm Express controller.

  @param[in] Private     The pointer to the PEI_NVME_CONTROLLER_PRIVATE_DATA data structure.

  @retval EFI_SUCCESS    The NVM Express Controller is initialized successfully.
  @retval Others         A device error occurred while initializing the controller.

**/
EFI_STATUS
NvmeControllerInit (
  IN PEI_NVME_CONTROLLER_PRIVATE_DATA    *Private
  );

/**
  Get specified identify namespace data.

  @param[in] Private        The pointer to the PEI_NVME_CONTROLLER_PRIVATE_DATA data structure.
  @param[in] NamespaceId    The specified namespace identifier.
  @param[in] Buffer         The buffer used to store the identify namespace data.

  @return EFI_SUCCESS         Successfully get the identify namespace data.
  @return EFI_DEVICE_ERROR    Fail to get the identify namespace data.

**/
EFI_STATUS
NvmeIdentifyNamespace (
  IN PEI_NVME_CONTROLLER_PRIVATE_DATA    *Private,
  IN UINT32                              NamespaceId,
  IN VOID                                *Buffer
  );

/**
  Free the resources allocated by an NVME controller.

  @param[in] Private     The pointer to the PEI_NVME_CONTROLLER_PRIVATE_DATA data structure.

**/
VOID
NvmeFreeControllerResource (
  IN PEI_NVME_CONTROLLER_PRIVATE_DATA    *Private
  );

#endif