hdlcd.hh

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/*
 * Copyright (c) 2010-2013, 2015, 2017 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * Authors: Chris Emmons
 *          Andreas Sandberg
 */


#ifndef __DEV_ARM_HDLCD_HH__
#define __DEV_ARM_HDLCD_HH__

#include <fstream>
#include <memory>

#include "base/bitmap.hh"
#include "base/framebuffer.hh"
#include "base/output.hh"
#include "dev/arm/amba_device.hh"
#include "dev/pixelpump.hh"
#include "sim/serialize.hh"

class VncInput;
struct HDLcdParams;
class HDLcdPixelPump;

class HDLcd: public AmbaDmaDevice
{
  public:
    HDLcd(const HDLcdParams *p);
    ~HDLcd();

    void regStats() override;

    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;

    void drainResume() override;

  public: // IO device interface
    Tick read(PacketPtr pkt) override;
    Tick write(PacketPtr pkt) override;

    AddrRangeList getAddrRanges() const override { return addrRanges; }

  protected: // Parameters
    VncInput *vnc;
    const bool workaroundSwapRB;
    const bool workaroundDmaLineCount;
    const AddrRangeList addrRanges;
    const bool enableCapture;
    const Addr pixelBufferSize;
    const Tick virtRefreshRate;

  protected: // Register handling
    enum RegisterOffset {
        Version          = 0x0000,
        Int_RawStat      = 0x0010,
        Int_Clear        = 0x0014,
        Int_Mask         = 0x0018,
        Int_Status       = 0x001C,
        Fb_Base          = 0x0100,
        Fb_Line_Length   = 0x0104,
        Fb_Line_Count    = 0x0108,
        Fb_Line_Pitch    = 0x010C,
        Bus_Options      = 0x0110,
        V_Sync           = 0x0200,
        V_Back_Porch     = 0x0204,
        V_Data           = 0x0208,
        V_Front_Porch    = 0x020C,
        H_Sync           = 0x0210,
        H_Back_Porch     = 0x0214,
        H_Data           = 0x0218,
        H_Front_Porch    = 0x021C,
        Polarities       = 0x0220,
        Command          = 0x0230,
        Pixel_Format     = 0x0240,
        Red_Select       = 0x0244,
        Green_Select     = 0x0248,
        Blue_Select      = 0x024C,
    };

    static constexpr size_t BUS_OPTIONS_RESETV = 0x408;

    static constexpr size_t VERSION_RESETV = 0x1CDC0000;

    static constexpr size_t AXI_PORT_WIDTH = 8;

    static constexpr size_t MAX_BURST_LEN = 16;

    static constexpr size_t MAX_PIXEL_SIZE = 4;

    BitUnion32(VersionReg)
        Bitfield<7,0>   version_minor;
        Bitfield<15,8>  version_major;
        Bitfield<31,16> product_id;
    EndBitUnion(VersionReg)

    static constexpr uint32_t INT_DMA_END = (1UL << 0);
    static constexpr uint32_t INT_BUS_ERROR = (1UL << 1);
    static constexpr uint32_t INT_VSYNC = (1UL << 2);
    static constexpr uint32_t INT_UNDERRUN = (1UL << 3);

    BitUnion32(FbLineCountReg)
        Bitfield<11,0>  fb_line_count;
        Bitfield<31,12> reserved_31_12;
    EndBitUnion(FbLineCountReg)

    BitUnion32(BusOptsReg)
        Bitfield<4,0>   burst_len;
        Bitfield<7,5>   reserved_7_5;
        Bitfield<11,8>  max_outstanding;
        Bitfield<31,12> reserved_31_12;
    EndBitUnion(BusOptsReg)

    BitUnion32(TimingReg)
        Bitfield<11,0>  val;
        Bitfield<31,12> reserved_31_12;
    EndBitUnion(TimingReg)

    BitUnion32(PolaritiesReg)
        Bitfield<0>    vsync_polarity;
        Bitfield<1>    hsync_polarity;
        Bitfield<2>    dataen_polarity;
        Bitfield<3>    data_polarity;
        Bitfield<4>    pxlclk_polarity;
        Bitfield<31,5> reserved_31_5;
    EndBitUnion(PolaritiesReg)

    BitUnion32(CommandReg)
        Bitfield<0>    enable;
        Bitfield<31,1> reserved_31_1;
    EndBitUnion(CommandReg)

    BitUnion32(PixelFormatReg)
        Bitfield<2,0>  reserved_2_0;
        Bitfield<4,3>  bytes_per_pixel;
        Bitfield<30,5> reserved_30_5;
        Bitfield<31>   big_endian;
    EndBitUnion(PixelFormatReg)

    BitUnion32(ColorSelectReg)
        Bitfield<4,0>   offset;
        Bitfield<7,5>   reserved_7_5;
        Bitfield<11,8>  size;
        Bitfield<15,12> reserved_15_12;
        Bitfield<23,16> default_color;
        Bitfield<31,24> reserved_31_24;
    EndBitUnion(ColorSelectReg)
    const VersionReg version;       
    uint32_t int_rawstat;           
    uint32_t int_mask;              
    uint32_t fb_base;               
    uint32_t fb_line_length;        
    FbLineCountReg fb_line_count;   
    int32_t fb_line_pitch;          
    BusOptsReg bus_options;         
    TimingReg v_sync;               
    TimingReg v_back_porch;         
    TimingReg v_data;               
    TimingReg v_front_porch;        
    TimingReg h_sync;               
    TimingReg h_back_porch;         
    TimingReg h_data;               
    TimingReg h_front_porch;        
    PolaritiesReg polarities;       
    CommandReg command;             
    PixelFormatReg pixel_format;    
    ColorSelectReg red_select;      
    ColorSelectReg green_select;    
    ColorSelectReg blue_select;     
    uint32_t readReg(Addr offset);
    void writeReg(Addr offset, uint32_t value);

    PixelConverter pixelConverter() const;
    DisplayTimings displayTimings() const;

    void createDmaEngine();

    void cmdEnable();
    void cmdDisable();

    bool enabled() const { return command.enable; }

  public: // Pixel pump callbacks
    bool pxlNext(Pixel &p);
    void pxlVSyncBegin();
    void pxlVSyncEnd();
    void pxlUnderrun();
    void pxlFrameDone();

  protected: // Interrupt handling
    void setInterrupts(uint32_t ints, uint32_t mask);

    void intMask(uint32_t mask) { setInterrupts(int_rawstat, mask); }

    void intRaise(uint32_t ints) {
        setInterrupts(int_rawstat | ints, int_mask);
    }

    void intClear(uint32_t ints) {
        setInterrupts(int_rawstat & ~ints, int_mask);
    }

    uint32_t intStatus() const { return int_rawstat & int_mask; }

  protected: // Pixel output
    class PixelPump : public BasePixelPump
    {
      public:
        PixelPump(HDLcd &p, ClockDomain &pxl_clk, unsigned pixel_chunk)
            : BasePixelPump(p, pxl_clk, pixel_chunk), parent(p) {}

        void dumpSettings();

      protected:
        bool nextPixel(Pixel &p) override { return parent.pxlNext(p); }

        void onVSyncBegin() override { return parent.pxlVSyncBegin(); }
        void onVSyncEnd() override { return parent.pxlVSyncEnd(); }

        void onUnderrun(unsigned x, unsigned y) override {
            parent.pxlUnderrun();
        }

        void onFrameDone() override { parent.pxlFrameDone(); }

      protected:
        HDLcd &parent;
    };

    void virtRefresh();
    EventWrapper<HDLcd, &HDLcd::virtRefresh> virtRefreshEvent;

    Bitmap bmp;

    OutputStream *pic;

    PixelConverter conv;

    PixelPump pixelPump;

  protected: // DMA handling
    class DmaEngine : public DmaReadFifo
    {
      public:
        DmaEngine(HDLcd &_parent, size_t size,
                  unsigned request_size, unsigned max_pending,
                  size_t line_size, ssize_t line_pitch, unsigned num_lines);

        void startFrame(Addr fb_base);
        void abortFrame();
        void dumpSettings();

        void serialize(CheckpointOut &cp) const override;
        void unserialize(CheckpointIn &cp) override;

      protected:
        void onEndOfBlock() override;
        void onIdle() override;

        HDLcd &parent;
        const size_t lineSize;
        const ssize_t linePitch;
        const unsigned numLines;

        Addr nextLineAddr;
        Addr frameEnd;
    };

    std::unique_ptr<DmaEngine> dmaEngine;

  protected: // Statistics
    struct {
        Stats::Scalar underruns;
    } stats;
};

#endif