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RASCSI/cpp/hal/gpiobus_virtual.cpp
Uwe Seimet baf89dcf86
Use standard C++ timer for long timeouts (#1327), remove unused code (#1328) 
* Replace timer in WaitSignal()

' Remove unused code

* Remove unused file
2023-11-14 16:03:25 +01:00

560 lines
14 KiB
C++
Raw Blame History

//---------------------------------------------------------------------------
//
// SCSI Target Emulator PiSCSI
// for Raspberry Pi
//
// Powered by XM6 TypeG Technology.
// Copyright (C) 2016-2020 GIMONS
//
//---------------------------------------------------------------------------
#include "hal/gpiobus_virtual.h"
#include "hal/gpiobus.h"
#include "hal/systimer.h"
#include "hal/log.h"
#include <cstddef>
#include <map>
#include <memory>
#include <string.h>
#ifdef __linux__
#include <sys/epoll.h>
#endif
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
using namespace std;
bool GPIOBUS_Virtual::Init(mode_e mode)
{
GPIO_FUNCTION_TRACE
GPIOBUS::Init(mode);
#ifdef SHARED_MEMORY_GPIO
// Create a shared memory region that can be accessed as a virtual "SCSI bus"
// mutual exclusion semaphore, mutex_sem with an initial value 0.
if ((mutex_sem = sem_open(SHARED_MEM_MUTEX_NAME.c_str(), O_CREAT, 0660, 0)) == SEM_FAILED) {
LOGERROR("Unable to open shared memory semaphore %s. Are you running as root?", SHARED_MEM_MUTEX_NAME.c_str());
}
// Get shared memory
if ((fd_shm = shm_open(SHARED_MEM_NAME.c_str(), O_RDWR | O_CREAT | O_EXCL, 0660)) == -1) {
LOGERROR("Unable to open shared memory %s. Are you running as root?", SHARED_MEM_NAME.c_str());
sem_close(mutex_sem);
}
if (ftruncate(fd_shm, sizeof(uint32_t)) == -1) {
LOGERROR("Unable to read shared memory");
sem_close(mutex_sem);
shm_unlink(SHARED_MEM_NAME.c_str());
return false;
}
signals = static_cast<uint32_t *>(mmap(NULL, sizeof(uint32_t), PROT_READ | PROT_WRITE, MAP_SHARED, fd_shm, 0));
if (static_cast<void *>(signals) == MAP_FAILED) {
LOGERROR("Unabled to map shared memory");
sem_close(mutex_sem);
shm_unlink(SHARED_MEM_NAME.c_str());
}
#else
signals = make_shared<uint32_t>(0);
#endif
return true;
}
void GPIOBUS_Virtual::Cleanup()
{
// Set control signals
PinSetSignal(PIN_ENB, OFF);
PinSetSignal(PIN_ACT, OFF);
PinSetSignal(PIN_TAD, OFF);
PinSetSignal(PIN_IND, OFF);
PinSetSignal(PIN_DTD, OFF);
PinConfig(PIN_ACT, GPIO_INPUT);
PinConfig(PIN_TAD, GPIO_INPUT);
PinConfig(PIN_IND, GPIO_INPUT);
PinConfig(PIN_DTD, GPIO_INPUT);
// Initialize all signals
for (int i = 0; SignalTable[i] >= 0; i++) {
int pin = SignalTable[i];
PinSetSignal(pin, OFF);
PinConfig(pin, GPIO_INPUT);
PullConfig(pin, GPIO_PULLNONE);
}
#ifdef SHARED_MEMORY_GPIO
munmap(static_cast<void *>(signals), sizeof(uint32_t));
shm_unlink(SHARED_MEM_NAME.c_str());
sem_close(mutex_sem);
#endif
}
void GPIOBUS_Virtual::Reset()
{
#if defined(__x86_64__) || defined(__X86__)
return;
#else
int i;
int j;
// Turn off active signal
SetControl(PIN_ACT, ACT_OFF);
// Set all signals to off
for (i = 0;; i++) {
j = SignalTable[i];
if (j < 0) {
break;
}
SetSignal(j, OFF);
}
if (actmode == mode_e::TARGET) {
// Target mode
// Set target signal to input
SetControl(PIN_TAD, TAD_IN);
SetMode(PIN_BSY, IN);
SetMode(PIN_MSG, IN);
SetMode(PIN_CD, IN);
SetMode(PIN_REQ, IN);
SetMode(PIN_IO, IN);
// Set the initiator signal to input
SetControl(PIN_IND, IND_IN);
SetMode(PIN_SEL, IN);
SetMode(PIN_ATN, IN);
SetMode(PIN_ACK, IN);
SetMode(PIN_RST, IN);
// Set data bus signals to input
SetControl(PIN_DTD, DTD_IN);
SetMode(PIN_DT0, IN);
SetMode(PIN_DT1, IN);
SetMode(PIN_DT2, IN);
SetMode(PIN_DT3, IN);
SetMode(PIN_DT4, IN);
SetMode(PIN_DT5, IN);
SetMode(PIN_DT6, IN);
SetMode(PIN_DT7, IN);
SetMode(PIN_DP, IN);
} else {
// Initiator mode
// Set target signal to input
SetControl(PIN_TAD, TAD_IN);
SetMode(PIN_BSY, IN);
SetMode(PIN_MSG, IN);
SetMode(PIN_CD, IN);
SetMode(PIN_REQ, IN);
SetMode(PIN_IO, IN);
// Set the initiator signal to output
SetControl(PIN_IND, IND_OUT);
SetMode(PIN_SEL, OUT);
SetMode(PIN_ATN, OUT);
SetMode(PIN_ACK, OUT);
SetMode(PIN_RST, OUT);
// Set the data bus signals to output
SetControl(PIN_DTD, DTD_OUT);
SetMode(PIN_DT0, OUT);
SetMode(PIN_DT1, OUT);
SetMode(PIN_DT2, OUT);
SetMode(PIN_DT3, OUT);
SetMode(PIN_DT4, OUT);
SetMode(PIN_DT5, OUT);
SetMode(PIN_DT6, OUT);
SetMode(PIN_DT7, OUT);
SetMode(PIN_DP, OUT);
}
// Initialize all signals
signals = 0;
#endif // ifdef __x86_64__ || __X86__
}
void GPIOBUS_Virtual::SetENB(bool ast)
{
PinSetSignal(PIN_ENB, ast ? ENB_ON : ENB_OFF);
}
bool GPIOBUS_Virtual::GetBSY() const
{
return GetSignal(PIN_BSY);
}
void GPIOBUS_Virtual::SetBSY(bool ast)
{
// Set BSY signal
SetSignal(PIN_BSY, ast);
if (actmode == mode_e::TARGET) {
if (ast) {
// Turn on ACTIVE signal
SetControl(PIN_ACT, ACT_ON);
// Set Target signal to output
SetControl(PIN_TAD, TAD_OUT);
SetMode(PIN_BSY, OUT);
SetMode(PIN_MSG, OUT);
SetMode(PIN_CD, OUT);
SetMode(PIN_REQ, OUT);
SetMode(PIN_IO, OUT);
} else {
// Turn off the ACTIVE signal
SetControl(PIN_ACT, ACT_OFF);
// Set the target signal to input
SetControl(PIN_TAD, TAD_IN);
SetMode(PIN_BSY, IN);
SetMode(PIN_MSG, IN);
SetMode(PIN_CD, IN);
SetMode(PIN_REQ, IN);
SetMode(PIN_IO, IN);
}
}
}
bool GPIOBUS_Virtual::GetSEL() const
{
return GetSignal(PIN_SEL);
}
void GPIOBUS_Virtual::SetSEL(bool ast)
{
if (actmode == mode_e::INITIATOR && ast) {
// Turn on ACTIVE signal
SetControl(PIN_ACT, ACT_ON);
}
// Set SEL signal
SetSignal(PIN_SEL, ast);
}
bool GPIOBUS_Virtual::GetATN() const
{
return GetSignal(PIN_ATN);
}
void GPIOBUS_Virtual::SetATN(bool ast)
{
SetSignal(PIN_ATN, ast);
}
bool GPIOBUS_Virtual::GetACK() const
{
return GetSignal(PIN_ACK);
}
void GPIOBUS_Virtual::SetACK(bool ast)
{
SetSignal(PIN_ACK, ast);
}
bool GPIOBUS_Virtual::GetACT() const
{
return GetSignal(PIN_ACT);
}
void GPIOBUS_Virtual::SetACT(bool ast)
{
SetSignal(PIN_ACT, ast);
}
bool GPIOBUS_Virtual::GetRST() const
{
return GetSignal(PIN_RST);
}
void GPIOBUS_Virtual::SetRST(bool ast)
{
SetSignal(PIN_RST, ast);
}
bool GPIOBUS_Virtual::GetMSG() const
{
return GetSignal(PIN_MSG);
}
void GPIOBUS_Virtual::SetMSG(bool ast)
{
SetSignal(PIN_MSG, ast);
}
bool GPIOBUS_Virtual::GetCD() const
{
return GetSignal(PIN_CD);
}
void GPIOBUS_Virtual::SetCD(bool ast)
{
SetSignal(PIN_CD, ast);
}
bool GPIOBUS_Virtual::GetIO()
{
bool ast = GetSignal(PIN_IO);
if (actmode == mode_e::INITIATOR) {
// Change the data input/output direction by IO signal
if (ast) {
SetControl(PIN_DTD, DTD_IN);
SetMode(PIN_DT0, IN);
SetMode(PIN_DT1, IN);
SetMode(PIN_DT2, IN);
SetMode(PIN_DT3, IN);
SetMode(PIN_DT4, IN);
SetMode(PIN_DT5, IN);
SetMode(PIN_DT6, IN);
SetMode(PIN_DT7, IN);
SetMode(PIN_DP, IN);
} else {
SetControl(PIN_DTD, DTD_OUT);
SetMode(PIN_DT0, OUT);
SetMode(PIN_DT1, OUT);
SetMode(PIN_DT2, OUT);
SetMode(PIN_DT3, OUT);
SetMode(PIN_DT4, OUT);
SetMode(PIN_DT5, OUT);
SetMode(PIN_DT6, OUT);
SetMode(PIN_DT7, OUT);
SetMode(PIN_DP, OUT);
}
}
return ast;
}
void GPIOBUS_Virtual::SetIO(bool ast)
{
SetSignal(PIN_IO, ast);
if (actmode == mode_e::TARGET) {
// Change the data input/output direction by IO signal
if (ast) {
SetControl(PIN_DTD, DTD_OUT);
SetDAT(0);
SetMode(PIN_DT0, OUT);
SetMode(PIN_DT1, OUT);
SetMode(PIN_DT2, OUT);
SetMode(PIN_DT3, OUT);
SetMode(PIN_DT4, OUT);
SetMode(PIN_DT5, OUT);
SetMode(PIN_DT6, OUT);
SetMode(PIN_DT7, OUT);
SetMode(PIN_DP, OUT);
} else {
SetControl(PIN_DTD, DTD_IN);
SetMode(PIN_DT0, IN);
SetMode(PIN_DT1, IN);
SetMode(PIN_DT2, IN);
SetMode(PIN_DT3, IN);
SetMode(PIN_DT4, IN);
SetMode(PIN_DT5, IN);
SetMode(PIN_DT6, IN);
SetMode(PIN_DT7, IN);
SetMode(PIN_DP, IN);
}
}
}
bool GPIOBUS_Virtual::GetREQ() const
{
return GetSignal(PIN_REQ);
}
void GPIOBUS_Virtual::SetREQ(bool ast)
{
SetSignal(PIN_REQ, ast);
}
//---------------------------------------------------------------------------
//
// Get data signals
//
//---------------------------------------------------------------------------
uint8_t GPIOBUS_Virtual::GetDAT()
{
GPIO_FUNCTION_TRACE
uint32_t data = Acquire();
data = ((data >> (PIN_DT0 - 0)) & (1 << 0)) | ((data >> (PIN_DT1 - 1)) & (1 << 1)) |
((data >> (PIN_DT2 - 2)) & (1 << 2)) | ((data >> (PIN_DT3 - 3)) & (1 << 3)) |
((data >> (PIN_DT4 - 4)) & (1 << 4)) | ((data >> (PIN_DT5 - 5)) & (1 << 5)) |
((data >> (PIN_DT6 - 6)) & (1 << 6)) | ((data >> (PIN_DT7 - 7)) & (1 << 7));
return (uint8_t)data;
}
//---------------------------------------------------------------------------
//
// Set data signals
//
//---------------------------------------------------------------------------
void GPIOBUS_Virtual::SetDAT(uint8_t dat)
{
GPIO_FUNCTION_TRACE
auto new_dat = static_cast<byte>(dat);
PinSetSignal(PIN_DT0, (new_dat & ((byte)1 << 0)) != (byte)0);
PinSetSignal(PIN_DT1, (new_dat & ((byte)1 << 1)) != (byte)0);
PinSetSignal(PIN_DT2, (new_dat & ((byte)1 << 2)) != (byte)0);
PinSetSignal(PIN_DT3, (new_dat & ((byte)1 << 3)) != (byte)0);
PinSetSignal(PIN_DT4, (new_dat & ((byte)1 << 4)) != (byte)0);
PinSetSignal(PIN_DT5, (new_dat & ((byte)1 << 5)) != (byte)0);
PinSetSignal(PIN_DT6, (new_dat & ((byte)1 << 6)) != (byte)0);
PinSetSignal(PIN_DT7, (new_dat & ((byte)1 << 7)) != (byte)0);
}
//---------------------------------------------------------------------------
//
// Create work table
//
//---------------------------------------------------------------------------
void GPIOBUS_Virtual::MakeTable(void)
{
GPIO_FUNCTION_TRACE
}
//---------------------------------------------------------------------------
//
// Control signal setting
//
//---------------------------------------------------------------------------
void GPIOBUS_Virtual::SetControl(int pin, bool ast)
{
LOGTRACE("%s hwpin: %d", __PRETTY_FUNCTION__, (int)pin)
PinSetSignal(pin, ast);
}
//---------------------------------------------------------------------------
//
// Input/output mode setting
//
//---------------------------------------------------------------------------
void GPIOBUS_Virtual::SetMode(int hw_pin, int mode)
{
// Doesn't do anything for virtual gpio bus
(void)hw_pin;
(void)mode;
}
//---------------------------------------------------------------------------
//
// Get input signal value
//
//---------------------------------------------------------------------------
bool GPIOBUS_Virtual::GetSignal(int hw_pin) const
{
GPIO_FUNCTION_TRACE
uint32_t signal_value = 0;
#ifdef SHARED_MEMORY_GPIO
if (sem_wait(mutex_sem) == -1) {
LOGERROR("Unable to lock the shared memory")
return false;
}
#endif
signal_value = *signals;
#ifdef SHARED_MEMORY_GPIO
if (sem_post(mutex_sem) == -1) {
LOGERROR("Unable to release the shared memory")
return false;
}
#endif
return (signal_value >> hw_pin) & 1;
}
//---------------------------------------------------------------------------
//
// Set output signal value
//
//---------------------------------------------------------------------------
void GPIOBUS_Virtual::SetSignal(int hw_pin, bool ast)
{
GPIO_FUNCTION_TRACE
PinSetSignal(hw_pin, ast);
}
void GPIOBUS_Virtual::DisableIRQ()
{
GPIO_FUNCTION_TRACE
// Nothing to do for virtual gpio bus
}
void GPIOBUS_Virtual::EnableIRQ()
{
GPIO_FUNCTION_TRACE
// Nothing to do for virtual gpio bus
}
//---------------------------------------------------------------------------
//
// Set output pin
//
//---------------------------------------------------------------------------
void GPIOBUS_Virtual::PinSetSignal(int hw_pin, bool ast)
{
LOGTRACE("%s hwpin: %d", __PRETTY_FUNCTION__, (int)hw_pin)
// Check for invalid pin
if (hw_pin < 0) {
return;
}
#ifdef SHARED_MEMORY_GPIO
if (sem_wait(mutex_sem) == -1) {
LOGERROR("Unable to lock the shared memory")
return;
}
#endif
if (ast) {
// Set the "gpio" bit
*signals |= 0x1 << hw_pin;
} else {
// Clear the "gpio" bit
*signals ^= ~(0x1 << hw_pin);
}
#ifdef SHARED_MEMORY_GPIO
if (sem_post(mutex_sem) == -1) {
LOGERROR("Unable to release the shared memory")
return;
}
#endif
}
//---------------------------------------------------------------------------
//
// Set the signal drive strength
//
//---------------------------------------------------------------------------
void GPIOBUS_Virtual::DrvConfig(uint32_t drive)
{
(void)drive;
// Nothing to do for virtual GPIO
}
uint32_t GPIOBUS_Virtual::Acquire()
{
GPIO_FUNCTION_TRACE;
uint32_t signal_value = 0;
#ifdef SHARED_MEMORY_GPIO
if (sem_wait(mutex_sem) == -1) {
LOGERROR("Unable to lock the shared memory")
return false;
}
#endif
signal_value = *signals;
#ifdef SHARED_MEMORY_GPIO
if (sem_post(mutex_sem) == -1) {
LOGERROR("Unable to release the shared memory")
return false;
}
#endif
return signal_value;
}
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