mirror of https://github.com/akuker/RASCSI.git
219 lines
6.7 KiB
C++
219 lines
6.7 KiB
C++
//---------------------------------------------------------------------------
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//
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// SCSI Target Emulator PiSCSI
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// for Raspberry Pi
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//
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// Powered by XM6 TypeG Technology.
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// Copyright (C) 2016-2020 GIMONS
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//
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//---------------------------------------------------------------------------
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#pragma once
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#include "hal/bus.h"
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#include "shared/scsi.h"
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#include <memory>
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#include <vector>
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#ifdef __linux__
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#include <linux/gpio.h>
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#endif
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//---------------------------------------------------------------------------
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//
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// Connection method definitions
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//
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//---------------------------------------------------------------------------
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//#define CONNECT_TYPE_STANDARD // Standard (SCSI logic, standard pin assignment)
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//#define CONNECT_TYPE_FULLSPEC // Full spec (SCSI logic, standard pin assignment)
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//#define CONNECT_TYPE_AIBOM // AIBOM version (positive logic, unique pin assignment)
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//#define CONNECT_TYPE_GAMERNIUM // GAMERnium.com version (standard logic, unique pin assignment)
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#if defined CONNECT_TYPE_STANDARD
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#include "hal/connection_type/connection_standard.h"
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#elif defined CONNECT_TYPE_FULLSPEC
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#include "hal/connection_type/connection_fullspec.h"
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#elif defined CONNECT_TYPE_AIBOM
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#include "hal/connection_type/connection_aibom.h"
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#elif defined CONNECT_TYPE_GAMERNIUM
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#include "hal/connection_type/connection_gamernium.h"
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#else
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#error Invalid connection type or none specified
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#endif
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// #define ENABLE_GPIO_TRACE
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#ifdef ENABLE_GPIO_TRACE
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#define GPIO_FUNCTION_TRACE LOGTRACE("%s", __PRETTY_FUNCTION__)
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#else
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#define GPIO_FUNCTION_TRACE
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#endif
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using namespace std;
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//---------------------------------------------------------------------------
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//
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// Signal control logic and pin assignment customization
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//
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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//
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// SIGNAL_CONTROL_MODE: Signal control mode selection
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// You can customize the signal control logic from Version 1.22
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//
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// 0:SCSI logical specification
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// Conversion board using 74LS641-1 etc. directly connected or published on HP
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// True : 0V
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// False : Open collector output (disconnect from bus)
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//
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// 1:Negative logic specification (when using conversion board for negative logic -> SCSI logic)
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// There is no conversion board with this specification at this time
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// True : 0V -> (CONVERT) -> 0V
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// False : 3.3V -> (CONVERT) -> Open collector output
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//
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// 2:Positive logic specification (when using the conversion board for positive logic -> SCSI logic)
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// PiSCSI Adapter Rev.C @132sync etc.
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//
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// True : 3.3V -> (CONVERT) -> 0V
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// False : 0V -> (CONVERT) -> Open collector output
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//
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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//
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// Control signal pin assignment setting
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// GPIO pin mapping table for control signals.
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//
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// Control signal:
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// PIN_ACT
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// Signal that indicates the status of processing SCSI command.
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// PIN_ENB
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// Signal that indicates the valid signal from start to finish.
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// PIN_TAD
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// Signal that indicates the input/output direction of the target signal (BSY,IO,CD,MSG,REG).
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// PIN_IND
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// Signal that indicates the input/output direction of the initiator signal (SEL, ATN, RST, ACK).
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// PIN_DTD
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// Signal that indicates the input/output direction of the data lines (DT0...DT7,DP).
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//
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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//
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// Control signal output logic
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// 0V:FALSE 3.3V:TRUE
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//
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// ACT_ON
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// PIN_ACT signal
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// ENB_ON
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// PIN_ENB signal
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// TAD_IN
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// PIN_TAD This is the logic when inputting.
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// IND_IN
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// PIN_ENB This is the logic when inputting.
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// DTD_IN
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// PIN_ENB This is the logic when inputting.
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//
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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//
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// SCSI signal pin assignment setting
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// GPIO pin mapping table for SCSI signals.
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// PIN_DT0～PIN_SEL
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//
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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//
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// Constant declarations (GPIO)
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//
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//---------------------------------------------------------------------------
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const static int GPIO_INPUT = 0;
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const static int GPIO_OUTPUT = 1;
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const static int GPIO_IRQ_IN = 3;
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const static int GPIO_PULLNONE = 0;
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const static int GPIO_PULLDOWN = 1;
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const static int GPIO_PULLUP = 2;
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//---------------------------------------------------------------------------
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//
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// Constant declarations (Control signals)
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//
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//---------------------------------------------------------------------------
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#define ACT_OFF !ACT_ON
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#define ENB_OFF !ENB_ON
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#define TAD_OUT !TAD_IN
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#define IND_OUT !IND_IN
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#define DTD_OUT !DTD_IN
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//---------------------------------------------------------------------------
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//
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// Constant declarations (SCSI)
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//
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//---------------------------------------------------------------------------
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#define IN GPIO_INPUT
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#define OUT GPIO_OUTPUT
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const static int ON = 1;
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const static int OFF = 0;
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//---------------------------------------------------------------------------
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//
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// Class definition
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//
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//---------------------------------------------------------------------------
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class GPIOBUS : public BUS
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{
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public:
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// Basic Functions
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GPIOBUS() = default;
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// Destructor
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~GPIOBUS() override = default;
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// Initialization
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bool Init(mode_e mode = mode_e::TARGET) override;
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// Command receive handshake
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int CommandHandShake(vector<uint8_t>&) override;
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// Data receive handshake
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int ReceiveHandShake(uint8_t *, int) override;
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// Data transmission handshake
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int SendHandShake(uint8_t *, int, int) override;
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// SEL signal event polling
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bool PollSelectEvent() override;
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// Clear SEL signal event
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void ClearSelectEvent() override;
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protected:
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virtual void MakeTable() = 0;
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bool GetSignal(int pin) const override = 0;
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void SetSignal(int pin, bool ast) override = 0;
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bool WaitSignal(int pin, bool ast);
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// Wait for a signal to change
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virtual bool WaitREQ(bool ast) = 0;
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virtual bool WaitACK(bool ast) = 0;
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// Interrupt control
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virtual void EnableIRQ() = 0;
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virtual void DisableIRQ() = 0;
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// Set GPIO output signal
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virtual void PinSetSignal(int pin, bool ast) = 0;
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// Set GPIO drive strength
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virtual void DrvConfig(uint32_t drive) = 0;
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// Operation mode
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mode_e actmode = mode_e::TARGET;
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#ifdef __linux__
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// SEL signal event request
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struct gpioevent_request selevreq = {};
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// epoll file descriptor
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int epfd = 0;
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#endif
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};
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