mirror of
https://github.com/akuker/RASCSI.git
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515 lines
16 KiB
C++
515 lines
16 KiB
C++
//---------------------------------------------------------------------------
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//
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// SCSI Target Emulator RaSCSI Reloaded
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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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// [ GPIO-SCSI bus ]
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//
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//---------------------------------------------------------------------------
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#pragma once
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#include "shared/config.h"
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#include "shared/scsi.h"
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#include "bus.h"
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#include <array>
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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/gpiobus_standard.h"
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#elif defined CONNECT_TYPE_FULLSPEC
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#include "hal/gpiobus_fullspec.h"
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#elif defined CONNECT_TYPE_AIBOM
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#include "hal/gpiobus_aibom.h"
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#elif defined CONNECT_TYPE_GAMERNIUM
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#include "hal/gpiobus_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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using namespace std; //NOSONAR Not relevant for rascsi
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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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// RaSCSI 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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#define ALL_SCSI_PINS \
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((1<<PIN_DT0)|\
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(1<<PIN_DT1)|\
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(1<<PIN_DT2)|\
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(1<<PIN_DT3)|\
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(1<<PIN_DT4)|\
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(1<<PIN_DT5)|\
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(1<<PIN_DT6)|\
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(1<<PIN_DT7)|\
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(1<<PIN_DP)|\
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(1<<PIN_ATN)|\
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(1<<PIN_RST)|\
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(1<<PIN_ACK)|\
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(1<<PIN_REQ)|\
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(1<<PIN_MSG)|\
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(1<<PIN_CD)|\
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(1<<PIN_IO)|\
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(1<<PIN_BSY)|\
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(1<<PIN_SEL))
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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 uint32_t SYST_OFFSET = 0x00003000;
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const static uint32_t IRPT_OFFSET = 0x0000B200;
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const static uint32_t ARMT_OFFSET = 0x0000B400;
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const static uint32_t PADS_OFFSET = 0x00100000;
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const static uint32_t GPIO_OFFSET = 0x00200000;
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const static uint32_t QA7_OFFSET = 0x01000000;
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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_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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const static int GPIO_FSEL_0 = 0;
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const static int GPIO_FSEL_1 = 1;
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const static int GPIO_FSEL_2 = 2;
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const static int GPIO_FSEL_3 = 3;
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const static int GPIO_SET_0 = 7;
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const static int GPIO_CLR_0 = 10;
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const static int GPIO_LEV_0 = 13;
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const static int GPIO_EDS_0 = 16;
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const static int GPIO_REN_0 = 19;
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const static int GPIO_FEN_0 = 22;
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const static int GPIO_HEN_0 = 25;
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const static int GPIO_LEN_0 = 28;
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const static int GPIO_AREN_0 = 31;
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const static int GPIO_AFEN_0 = 34;
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const static int GPIO_PUD = 37;
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const static int GPIO_CLK_0 = 38;
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const static int GPIO_GPPINMUXSD = 52;
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const static int GPIO_PUPPDN0 = 57;
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const static int GPIO_PUPPDN1 = 58;
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const static int GPIO_PUPPDN3 = 59;
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const static int GPIO_PUPPDN4 = 60;
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const static int PAD_0_27 = 11;
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const static int SYST_CS = 0;
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const static int SYST_CLO = 1;
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const static int SYST_CHI = 2;
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const static int SYST_C0 = 3;
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const static int SYST_C1 = 4;
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const static int SYST_C2 = 5;
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const static int SYST_C3 = 6;
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const static int ARMT_LOAD = 0;
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const static int ARMT_VALUE = 1;
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const static int ARMT_CTRL = 2;
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const static int ARMT_CLRIRQ = 3;
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const static int ARMT_RAWIRQ = 4;
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const static int ARMT_MSKIRQ = 5;
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const static int ARMT_RELOAD = 6;
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const static int ARMT_PREDIV = 7;
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const static int ARMT_FREERUN = 8;
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const static int IRPT_PND_IRQ_B = 0;
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const static int IRPT_PND_IRQ_1 = 1;
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const static int IRPT_PND_IRQ_2 = 2;
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const static int IRPT_FIQ_CNTL = 3;
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const static int IRPT_ENB_IRQ_1 = 4;
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const static int IRPT_ENB_IRQ_2 = 5;
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const static int IRPT_ENB_IRQ_B = 6;
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const static int IRPT_DIS_IRQ_1 = 7;
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const static int IRPT_DIS_IRQ_2 = 8;
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const static int IRPT_DIS_IRQ_B = 9;
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const static int QA7_CORE0_TINTC = 16;
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const static int GPIO_IRQ = (32 + 20); // GPIO3
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#define GPIO_INEDGE ((1 << PIN_BSY) | \
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(1 << PIN_SEL) | \
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(1 << PIN_ATN) | \
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(1 << PIN_ACK) | \
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(1 << PIN_RST))
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#define GPIO_MCI ((1 << PIN_MSG) | \
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(1 << PIN_CD) | \
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(1 << PIN_IO))
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//---------------------------------------------------------------------------
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//
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// Constant declarations (GIC)
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//
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//---------------------------------------------------------------------------
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const static uint32_t ARM_GICD_BASE = 0xFF841000;
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const static uint32_t ARM_GICC_BASE = 0xFF842000;
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const static uint32_t ARM_GIC_END = 0xFF847FFF;
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const static int GICD_CTLR = 0x000;
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const static int GICD_IGROUPR0 = 0x020;
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const static int GICD_ISENABLER0 = 0x040;
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const static int GICD_ICENABLER0 = 0x060;
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const static int GICD_ISPENDR0 = 0x080;
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const static int GICD_ICPENDR0 = 0x0A0;
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const static int GICD_ISACTIVER0 = 0x0C0;
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const static int GICD_ICACTIVER0 = 0x0E0;
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const static int GICD_IPRIORITYR0 = 0x100;
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const static int GICD_ITARGETSR0 = 0x200;
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const static int GICD_ICFGR0 = 0x300;
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const static int GICD_SGIR = 0x3C0;
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const static int GICC_CTLR = 0x000;
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const static int GICC_PMR = 0x001;
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const static int GICC_IAR = 0x003;
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const static int GICC_EOIR = 0x004;
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//---------------------------------------------------------------------------
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//
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// Constant declarations (GIC IRQ)
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//
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//---------------------------------------------------------------------------
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const static int GIC_IRQLOCAL0 = (16 + 14);
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const static int GIC_GPIO_IRQ = (32 + 116); // GPIO3
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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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// Constant declarations (bus control timing)
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//
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//---------------------------------------------------------------------------
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// SCSI Bus timings taken from:
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// https://www.staff.uni-mainz.de/tacke/scsi/SCSI2-05.html
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const static int SCSI_DELAY_ARBITRATION_DELAY_NS = 2400;
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const static int SCSI_DELAY_ASSERTION_PERIOD_NS = 90;
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const static int SCSI_DELAY_BUS_CLEAR_DELAY_NS = 800;
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const static int SCSI_DELAY_BUS_FREE_DELAY_NS = 800;
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const static int SCSI_DELAY_BUS_SET_DELAY_NS = 1800;
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const static int SCSI_DELAY_BUS_SETTLE_DELAY_NS = 400;
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const static int SCSI_DELAY_CABLE_SKEW_DELAY_NS = 10;
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const static int SCSI_DELAY_DATA_RELEASE_DELAY_NS = 400;
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const static int SCSI_DELAY_DESKEW_DELAY_NS = 45;
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const static int SCSI_DELAY_DISCONNECTION_DELAY_US = 200;
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const static int SCSI_DELAY_HOLD_TIME_NS = 45;
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const static int SCSI_DELAY_NEGATION_PERIOD_NS = 90;
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const static int SCSI_DELAY_POWER_ON_TO_SELECTION_TIME_S = 10; // (recommended)
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const static int SCSI_DELAY_RESET_TO_SELECTION_TIME_US = 250*1000; // (recommended)
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const static int SCSI_DELAY_RESET_HOLD_TIME_US = 25;
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const static int SCSI_DELAY_SELECTION_ABORT_TIME_US = 200;
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const static int SCSI_DELAY_SELECTION_TIMEOUT_DELAY_NS = 250*1000; // (recommended)
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const static int SCSI_DELAY_FAST_ASSERTION_PERIOD_NS = 30;
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const static int SCSI_DELAY_FAST_CABLE_SKEW_DELAY_NS = 5;
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const static int SCSI_DELAY_FAST_DESKEW_DELAY_NS = 20;
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const static int SCSI_DELAY_FAST_HOLD_TIME_NS = 10;
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const static int SCSI_DELAY_FAST_NEGATION_PERIOD_NS = 30;
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// The DaynaPort SCSI Link do a short delay in the middle of transfering
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// a packet. This is the number of uS that will be delayed between the
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// header and the actual data.
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const static int SCSI_DELAY_SEND_DATA_DAYNAPORT_US = 100;
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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 final : 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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~GPIOBUS() override = default;
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// Destructor
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bool Init(mode_e mode = mode_e::TARGET) override;
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// Initialization
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void Reset() override;
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// Reset
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void Cleanup() override;
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// Cleanup
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//---------------------------------------------------------------------------
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//
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// Bus signal acquisition
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//
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//---------------------------------------------------------------------------
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inline uint32_t Acquire() override
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{
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#if defined(__x86_64__) || defined(__X86__)
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// Only used for development/debugging purposes. Isn't really applicable
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// to any real-world RaSCSI application
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return 0;
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#else
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signals = *level;
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#if SIGNAL_CONTROL_MODE < 2
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// Invert if negative logic (internal processing is unified to positive logic)
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signals = ~signals;
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#endif // SIGNAL_CONTROL_MODE
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return signals;
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#endif // ifdef __x86_64__ || __X86__
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}
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void SetENB(bool ast);
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// Set ENB signal
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bool GetBSY() const override;
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// Get BSY signal
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void SetBSY(bool ast) override;
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// Set BSY signal
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bool GetSEL() const override;
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// Get SEL signal
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void SetSEL(bool ast) override;
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// Set SEL signal
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bool GetATN() const override;
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// Get ATN signal
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void SetATN(bool ast) override;
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// Set ATN signal
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bool GetACK() const override;
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// Get ACK signal
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void SetACK(bool ast) override;
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// Set ACK signal
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bool GetACT() const;
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// Get ACT signal
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void SetACT(bool ast);
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// Set ACT signal
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bool GetRST() const override;
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// Get RST signal
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void SetRST(bool ast) override;
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// Set RST signal
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bool GetMSG() const override;
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// Get MSG signal
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void SetMSG(bool ast) override;
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// Set MSG signal
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bool GetCD() const override;
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// Get CD signal
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void SetCD(bool ast) override;
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// Set CD signal
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bool GetIO() override;
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// Get IO signal
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void SetIO(bool ast) override;
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// Set IO signal
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bool GetREQ() const override;
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// Get REQ signal
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void SetREQ(bool ast) override;
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// Set REQ signal
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uint8_t GetDAT() override;
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// Get DAT signal
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void SetDAT(uint8_t dat) override;
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// Set DAT signal
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bool GetDP() const override;
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// Get Data parity signal
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int CommandHandShake(vector<uint8_t>&) override;
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// Command receive handshake
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int ReceiveHandShake(uint8_t *buf, int count) override;
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// Data receive handshake
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int SendHandShake(uint8_t *buf, int count, int delay_after_bytes) override;
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// Data transmission handshake
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static BUS::phase_t GetPhaseRaw(uint32_t raw_data);
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// Get the phase based on raw data
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#ifdef USE_SEL_EVENT_ENABLE
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// SEL signal interrupt
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bool PollSelectEvent() override;
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// SEL signal event polling
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void ClearSelectEvent() override;
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// Clear SEL signal event
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#endif
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private:
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// SCSI I/O signal control
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void MakeTable();
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// Create work data
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void SetControl(int pin, bool ast);
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// Set Control Signal
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void SetMode(int pin, int mode);
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// Set SCSI I/O mode
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bool GetSignal(int pin) const override;
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// Get SCSI input signal value
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void SetSignal(int pin, bool ast) override;
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// Set SCSI output signal value
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bool WaitSignal(int pin, int ast);
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// Wait for a signal to change
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// Interrupt control
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void DisableIRQ();
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// IRQ Disabled
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void EnableIRQ();
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// IRQ Enabled
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// GPIO pin functionality settings
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void PinConfig(int pin, int mode);
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// GPIO pin direction setting
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void PullConfig(int pin, int mode);
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// GPIO pin pull up/down resistor setting
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void PinSetSignal(int pin, bool ast);
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// Set GPIO output signal
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void DrvConfig(uint32_t drive);
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// Set GPIO drive strength
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mode_e actmode = mode_e::TARGET; // Operation mode
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#if !defined(__x86_64__) && !defined(__X86__)
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uint32_t baseaddr = 0; // Base address
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#endif
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int rpitype = 0; // Type of Raspberry Pi
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volatile uint32_t *gpio = nullptr; // GPIO register
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volatile uint32_t *pads = nullptr; // PADS register
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#if !defined(__x86_64__) && !defined(__X86__)
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volatile uint32_t *level = nullptr; // GPIO input level
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#endif
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volatile uint32_t *irpctl = nullptr; // Interrupt control register
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volatile uint32_t irptenb; // Interrupt enabled state
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volatile uint32_t *qa7regs = nullptr; // QA7 register
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volatile int tintcore; // Interupt control target CPU.
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volatile uint32_t tintctl; // Interupt control
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volatile uint32_t giccpmr; // GICC priority setting
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#if !defined(__x86_64__) && !defined(__X86__)
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volatile uint32_t *gicd = nullptr; // GIC Interrupt distributor register
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#endif
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volatile uint32_t *gicc = nullptr; // GIC CPU interface register
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array<uint32_t, 4> gpfsel; // GPFSEL0-4 backup values
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uint32_t signals = 0; // All bus signals
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#ifdef USE_SEL_EVENT_ENABLE
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struct gpioevent_request selevreq = {}; // SEL signal event request
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int epfd; // epoll file descriptor
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#endif // USE_SEL_EVENT_ENABLE
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#if SIGNAL_CONTROL_MODE == 0
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array<array<uint32_t, 256>, 3> tblDatMsk; // Data mask table
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array<array<uint32_t, 256>, 3> tblDatSet; // Data setting table
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#else
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array<uint32_t, 256> tblDatMsk = {}; // Data mask table
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array<uint32_t, 256> tblDatSet = {}; // Table setting table
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#endif
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static const array<int, 19> SignalTable; // signal table
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};
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