/** @file

  Copyright (c) 2012-2018, ARM Ltd. All rights reserved.

  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.

**/

#include <PiDxe.h>

#include <Library/ArmPlatformSysConfigLib.h>
#include <Library/IoLib.h>
#include <Library/PcdLib.h>
#include <Library/DebugLib.h>
#include <Library/DxeServicesTableLib.h>
#include <Library/LcdPlatformLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>

#include <Protocol/EdidDiscovered.h>
#include <Protocol/EdidActive.h>

#include <ArmPlatform.h>

typedef struct {
  UINT32                     Mode;
  UINT32                     HorizontalResolution;
  UINT32                     VerticalResolution;
  LCD_BPP                    Bpp;
  UINT32                     OscFreq;

  // These are used by HDLCD
  UINT32                     HSync;
  UINT32                     HBackPorch;
  UINT32                     HFrontPorch;
  UINT32                     VSync;
  UINT32                     VBackPorch;
  UINT32                     VFrontPorch;
} LCD_RESOLUTION;

LCD_RESOLUTION mResolutions[] = {
  { // Mode 0 : VGA : 640 x 480 x 24 bpp
    VGA, VGA_H_RES_PIXELS, VGA_V_RES_PIXELS, LCD_BITS_PER_PIXEL_24,
    VGA_OSC_FREQUENCY,
    VGA_H_SYNC, VGA_H_BACK_PORCH, VGA_H_FRONT_PORCH,
    VGA_V_SYNC, VGA_V_BACK_PORCH, VGA_V_FRONT_PORCH
  },
  { // Mode 1 : SVGA : 800 x 600 x 24 bpp
    SVGA, SVGA_H_RES_PIXELS, SVGA_V_RES_PIXELS, LCD_BITS_PER_PIXEL_24,
    SVGA_OSC_FREQUENCY,
    SVGA_H_SYNC, SVGA_H_BACK_PORCH, SVGA_H_FRONT_PORCH,
    SVGA_V_SYNC, SVGA_V_BACK_PORCH, SVGA_V_FRONT_PORCH
  },
  { // Mode 2 : XGA : 1024 x 768 x 24 bpp
    XGA, XGA_H_RES_PIXELS, XGA_V_RES_PIXELS, LCD_BITS_PER_PIXEL_24,
    XGA_OSC_FREQUENCY,
    XGA_H_SYNC, XGA_H_BACK_PORCH, XGA_H_FRONT_PORCH,
    XGA_V_SYNC, XGA_V_BACK_PORCH, XGA_V_FRONT_PORCH
  },
  { // Mode 3 : SXGA : 1280 x 1024 x 24 bpp
    SXGA, SXGA_H_RES_PIXELS, SXGA_V_RES_PIXELS, LCD_BITS_PER_PIXEL_24,
    (SXGA_OSC_FREQUENCY/2),
    SXGA_H_SYNC, SXGA_H_BACK_PORCH, SXGA_H_FRONT_PORCH,
    SXGA_V_SYNC, SXGA_V_BACK_PORCH, SXGA_V_FRONT_PORCH
  },
  { // Mode 4 : UXGA : 1600 x 1200 x 24 bpp
    UXGA, UXGA_H_RES_PIXELS, UXGA_V_RES_PIXELS, LCD_BITS_PER_PIXEL_24,
    (UXGA_OSC_FREQUENCY/2),
    UXGA_H_SYNC, UXGA_H_BACK_PORCH, UXGA_H_FRONT_PORCH,
    UXGA_V_SYNC, UXGA_V_BACK_PORCH, UXGA_V_FRONT_PORCH
  },
  { // Mode 5 : HD : 1920 x 1080 x 24 bpp
    HD, HD_H_RES_PIXELS, HD_V_RES_PIXELS, LCD_BITS_PER_PIXEL_24,
    (HD_OSC_FREQUENCY/2),
    HD_H_SYNC, HD_H_BACK_PORCH, HD_H_FRONT_PORCH,
    HD_V_SYNC, HD_V_BACK_PORCH, HD_V_FRONT_PORCH
  }
};

EFI_EDID_DISCOVERED_PROTOCOL  mEdidDiscovered = {
  0,
  NULL
};

EFI_EDID_ACTIVE_PROTOCOL      mEdidActive = {
  0,
  NULL
};

EFI_STATUS
LcdPlatformInitializeDisplay (
  IN EFI_HANDLE   Handle
  )
{
  EFI_STATUS  Status;

  // Set the FPGA multiplexer to select the video output from the
  // motherboard or the daughterboard
  Status = ArmPlatformSysConfigSet (
             SYS_CFG_MUXFPGA,
             ARM_VE_DAUGHTERBOARD_1_SITE
             );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  // Install the EDID Protocols
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &Handle,
                  &gEfiEdidDiscoveredProtocolGuid,
                  &mEdidDiscovered,
                  &gEfiEdidActiveProtocolGuid,
                  &mEdidActive,
                  NULL
                  );

  return Status;
}

EFI_STATUS
LcdPlatformGetVram (
  OUT EFI_PHYSICAL_ADDRESS*  VramBaseAddress,
  OUT UINTN*                 VramSize
  )
{
  EFI_STATUS              Status;
  EFI_ALLOCATE_TYPE       AllocationType;

  // Set the vram size
  *VramSize = LCD_VRAM_SIZE;

  *VramBaseAddress = (EFI_PHYSICAL_ADDRESS)LCD_VRAM_CORE_TILE_BASE;

  // Allocate the VRAM from the DRAM so that nobody else uses it.
  if (*VramBaseAddress == 0) {
    AllocationType = AllocateAnyPages;
  } else {
    AllocationType = AllocateAddress;
  }
  Status = gBS->AllocatePages (
                  AllocationType,
                  EfiBootServicesData,
                  EFI_SIZE_TO_PAGES (((UINTN)LCD_VRAM_SIZE)),
                  VramBaseAddress
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  // Mark the VRAM as write-combining.
  // The VRAM is inside the DRAM, which is cacheable.
  Status = gDS->SetMemorySpaceAttributes (
                  *VramBaseAddress,
                  *VramSize,
                  EFI_MEMORY_WC
                  );
  ASSERT_EFI_ERROR (Status);
  if (EFI_ERROR (Status)) {
    gBS->FreePages (*VramBaseAddress, EFI_SIZE_TO_PAGES (*VramSize));
    return Status;
  }

  return EFI_SUCCESS;
}

UINT32
LcdPlatformGetMaxMode (VOID)
{
  // The following line will report correctly the total number of graphics modes
  // that could be supported by the graphics driver
  return (sizeof (mResolutions) / sizeof (LCD_RESOLUTION));
}

EFI_STATUS
LcdPlatformSetMode (
  IN UINT32                         ModeNumber
  )
{
  EFI_STATUS            Status;

  if (ModeNumber >= LcdPlatformGetMaxMode ()) {
    return EFI_INVALID_PARAMETER;
  }

  // Set the video mode oscillator
  do {
    Status = ArmPlatformSysConfigSetDevice (
               SYS_CFG_OSC_SITE1,
               PcdGet32 (PcdHdLcdVideoModeOscId),
               mResolutions[ModeNumber].OscFreq
               );
  } while (Status == EFI_TIMEOUT);
  if (EFI_ERROR (Status)) {
    ASSERT_EFI_ERROR (Status);
    return Status;
  }

  // Set the DVI into the new mode
  do {
    Status = ArmPlatformSysConfigSet (
               SYS_CFG_DVIMODE,
               mResolutions[ModeNumber].Mode
               );
  } while (Status == EFI_TIMEOUT);
  if (EFI_ERROR (Status)) {
    ASSERT_EFI_ERROR (Status);
    return Status;
  }

  // Set the multiplexer
  Status = ArmPlatformSysConfigSet (
             SYS_CFG_MUXFPGA,
             ARM_VE_DAUGHTERBOARD_1_SITE
             );
  if (EFI_ERROR (Status)) {
    ASSERT_EFI_ERROR (Status);
    return Status;
  }

  return Status;
}

EFI_STATUS
LcdPlatformQueryMode (
  IN  UINT32                                ModeNumber,
  OUT EFI_GRAPHICS_OUTPUT_MODE_INFORMATION  *Info
  )
{
  if (ModeNumber >= LcdPlatformGetMaxMode ()) {
    return EFI_INVALID_PARAMETER;
  }

  Info->Version = 0;
  Info->HorizontalResolution = mResolutions[ModeNumber].HorizontalResolution;
  Info->VerticalResolution = mResolutions[ModeNumber].VerticalResolution;
  Info->PixelsPerScanLine = mResolutions[ModeNumber].HorizontalResolution;

  switch (mResolutions[ModeNumber].Bpp) {
  case LCD_BITS_PER_PIXEL_24:
    Info->PixelFormat                   = PixelRedGreenBlueReserved8BitPerColor;
    Info->PixelInformation.RedMask      = LCD_24BPP_RED_MASK;
    Info->PixelInformation.GreenMask    = LCD_24BPP_GREEN_MASK;
    Info->PixelInformation.BlueMask     = LCD_24BPP_BLUE_MASK;
    Info->PixelInformation.ReservedMask = LCD_24BPP_RESERVED_MASK;
    break;

  case LCD_BITS_PER_PIXEL_16_555:
  case LCD_BITS_PER_PIXEL_16_565:
  case LCD_BITS_PER_PIXEL_12_444:
  case LCD_BITS_PER_PIXEL_8:
  case LCD_BITS_PER_PIXEL_4:
  case LCD_BITS_PER_PIXEL_2:
  case LCD_BITS_PER_PIXEL_1:
  default:
    // These are not supported
    ASSERT (FALSE);
    break;
  }

  return EFI_SUCCESS;
}

EFI_STATUS
LcdPlatformGetTimings (
  IN  UINT32                              ModeNumber,
  OUT UINT32*                             HRes,
  OUT UINT32*                             HSync,
  OUT UINT32*                             HBackPorch,
  OUT UINT32*                             HFrontPorch,
  OUT UINT32*                             VRes,
  OUT UINT32*                             VSync,
  OUT UINT32*                             VBackPorch,
  OUT UINT32*                             VFrontPorch
  )
{
  if (ModeNumber >= LcdPlatformGetMaxMode ()) {
    return EFI_INVALID_PARAMETER;
  }

  *HRes           = mResolutions[ModeNumber].HorizontalResolution;
  *HSync          = mResolutions[ModeNumber].HSync;
  *HBackPorch     = mResolutions[ModeNumber].HBackPorch;
  *HFrontPorch    = mResolutions[ModeNumber].HFrontPorch;
  *VRes           = mResolutions[ModeNumber].VerticalResolution;
  *VSync          = mResolutions[ModeNumber].VSync;
  *VBackPorch     = mResolutions[ModeNumber].VBackPorch;
  *VFrontPorch    = mResolutions[ModeNumber].VFrontPorch;

  return EFI_SUCCESS;
}

EFI_STATUS
LcdPlatformGetBpp (
  IN  UINT32                              ModeNumber,
  OUT LCD_BPP  *                          Bpp
  )
{
  if (ModeNumber >= LcdPlatformGetMaxMode ()) {
    return EFI_INVALID_PARAMETER;
  }

  *Bpp = mResolutions[ModeNumber].Bpp;

  return EFI_SUCCESS;
}