mirror of
https://github.com/dingusdev/dingusppc.git
synced 2024-12-27 00:29:18 +00:00
334 lines
9.4 KiB
C++
334 lines
9.4 KiB
C++
/*
|
|
DingusPPC - The Experimental PowerPC Macintosh emulator
|
|
Copyright (C) 2018-22 divingkatae and maximum
|
|
(theweirdo) spatium
|
|
|
|
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/** @file Enhanced Serial Communications Controller (ESCC) emulation. */
|
|
|
|
#include <devices/deviceregistry.h>
|
|
#include <devices/serial/chario.h>
|
|
#include <devices/serial/escc.h>
|
|
#include <loguru.hpp>
|
|
#include <machines/machineproperties.h>
|
|
|
|
#include <cinttypes>
|
|
#include <memory>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
/** Remap the compatible addressing scheme to MacRISC one. */
|
|
const uint8_t compat_to_macrisc[6] = {
|
|
EsccReg::Port_B_Cmd, EsccReg::Port_A_Cmd,
|
|
EsccReg::Port_B_Data, EsccReg::Port_A_Data,
|
|
EsccReg::Enh_Reg_B, EsccReg::Enh_Reg_A
|
|
};
|
|
|
|
EsccController::EsccController()
|
|
{
|
|
// allocate channels
|
|
this->ch_a = std::unique_ptr<EsccChannel> (new EsccChannel("A"));
|
|
this->ch_b = std::unique_ptr<EsccChannel> (new EsccChannel("B"));
|
|
|
|
// attach backends
|
|
std::string backend_name = GET_STR_PROP("serial_backend");
|
|
|
|
this->ch_a->attach_backend(
|
|
(backend_name == "stdio") ? CHARIO_BE_STDIO :
|
|
#ifdef _WIN32
|
|
#else
|
|
(backend_name == "socket") ? CHARIO_BE_SOCKET :
|
|
#endif
|
|
CHARIO_BE_NULL
|
|
);
|
|
this->ch_b->attach_backend(CHARIO_BE_NULL);
|
|
|
|
this->reg_ptr = 0;
|
|
}
|
|
|
|
void EsccController::reset()
|
|
{
|
|
this->master_int_cntrl &= 0xFC;
|
|
this->master_int_cntrl |= 0xC0;
|
|
|
|
this->ch_a->reset(true);
|
|
this->ch_b->reset(true);
|
|
}
|
|
|
|
uint8_t EsccController::read(uint8_t reg_offset)
|
|
{
|
|
uint8_t result = 0;
|
|
|
|
switch(reg_offset) {
|
|
case EsccReg::Port_B_Cmd:
|
|
LOG_F(9, "ESCC: reading Port B register RR%d", this->reg_ptr);
|
|
if (this->reg_ptr == 2) {
|
|
// TODO: implement interrupt vector modifications
|
|
result = this->int_vec;
|
|
} else {
|
|
result = this->ch_b->read_reg(this->reg_ptr);
|
|
}
|
|
this->reg_ptr = 0;
|
|
break;
|
|
case EsccReg::Port_A_Cmd:
|
|
LOG_F(9, "ESCC: reading Port A register RR%d", this->reg_ptr);
|
|
if (this->reg_ptr == 2) {
|
|
return this->int_vec;
|
|
} else {
|
|
return this->ch_a->read_reg(this->reg_ptr);
|
|
}
|
|
break;
|
|
case EsccReg::Port_B_Data:
|
|
return this->ch_b->receive_byte();
|
|
case EsccReg::Port_A_Data:
|
|
return this->ch_a->receive_byte();
|
|
default:
|
|
LOG_F(9, "ESCC: reading from unimplemented register 0x%x", reg_offset);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
void EsccController::write(uint8_t reg_offset, uint8_t value)
|
|
{
|
|
switch(reg_offset) {
|
|
case EsccReg::Port_B_Cmd:
|
|
this->write_internal(this->ch_b.get(), value);
|
|
break;
|
|
case EsccReg::Port_A_Cmd:
|
|
this->write_internal(this->ch_a.get(), value);
|
|
break;
|
|
case EsccReg::Port_B_Data:
|
|
this->ch_b->send_byte(value);
|
|
break;
|
|
case EsccReg::Port_A_Data:
|
|
this->ch_a->send_byte(value);
|
|
break;
|
|
default:
|
|
LOG_F(9, "ESCC: writing 0x%X to unimplemented register 0x%x", value, reg_offset);
|
|
}
|
|
}
|
|
|
|
void EsccController::write_internal(EsccChannel *ch, uint8_t value)
|
|
{
|
|
if (this->reg_ptr) {
|
|
// chip-specific registers
|
|
if (this->reg_ptr == 9) {
|
|
// see if some reset is requested
|
|
switch(value & 0xC0) {
|
|
case RESET_CH_B:
|
|
this->master_int_cntrl &= 0xDF;
|
|
this->ch_b->reset(false);
|
|
break;
|
|
case RESET_CH_A:
|
|
this->master_int_cntrl &= 0xDF;
|
|
this->ch_a->reset(false);
|
|
break;
|
|
case RESET_ESCC:
|
|
this->reset();
|
|
break;
|
|
}
|
|
|
|
this->master_int_cntrl = value & 0x3F;
|
|
} else if (this->reg_ptr == 2) {
|
|
this->int_vec = value;
|
|
} else { // channel-specific registers
|
|
ch->write_reg(this->reg_ptr, value);
|
|
}
|
|
this->reg_ptr = 0;
|
|
} else {
|
|
this->reg_ptr = value & 7;
|
|
switch(value >> 3) {
|
|
case WR0Cmd::Point_High:
|
|
this->reg_ptr |= 8;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// ======================== ESCC Channel methods ==============================
|
|
void EsccChannel::attach_backend(int id)
|
|
{
|
|
switch(id) {
|
|
case CHARIO_BE_NULL:
|
|
this->chario = std::unique_ptr<CharIoBackEnd> (new CharIoNull);
|
|
break;
|
|
case CHARIO_BE_STDIO:
|
|
this->chario = std::unique_ptr<CharIoBackEnd> (new CharIoStdin);
|
|
break;
|
|
#ifdef _WIN32
|
|
#else
|
|
case CHARIO_BE_SOCKET:
|
|
this->chario = std::unique_ptr<CharIoBackEnd> (new CharIoSocket);
|
|
break;
|
|
#endif
|
|
default:
|
|
LOG_F(ERROR, "ESCC: unknown backend ID %d, using NULL instead", id);
|
|
this->chario = std::unique_ptr<CharIoBackEnd> (new CharIoNull);
|
|
}
|
|
}
|
|
|
|
void EsccChannel::reset(bool hw_reset)
|
|
{
|
|
this->chario->rcv_disable();
|
|
|
|
this->write_regs[1] &= 0x24;
|
|
this->write_regs[3] &= 0xFE;
|
|
this->write_regs[4] |= 0x04;
|
|
this->write_regs[5] &= 0x61;
|
|
this->write_regs[15] = 0xF8;
|
|
|
|
this->read_regs[0] &= 0x3C;
|
|
this->read_regs[0] |= 0x44;
|
|
this->read_regs[1] = 0x06;
|
|
this->read_regs[3] = 0x00;
|
|
this->read_regs[10] = 0x00;
|
|
|
|
// initialize DPLL
|
|
this->dpll_active = 0;
|
|
this->dpll_mode = DpllMode::NRZI;
|
|
this->dpll_clock_src = 0;
|
|
|
|
// initialize Baud Rate Generator (BRG)
|
|
this->brg_active = 0;
|
|
this->brg_clock_src = 0;
|
|
|
|
if (hw_reset) {
|
|
this->write_regs[10] = 0;
|
|
this->write_regs[11] = 8;
|
|
this->write_regs[14] &= 0xC0;
|
|
this->write_regs[14] |= 0x20;
|
|
} else {
|
|
this->write_regs[10] &= 0x60;
|
|
this->write_regs[14] &= 0xC3;
|
|
this->write_regs[14] |= 0x20;
|
|
}
|
|
}
|
|
|
|
void EsccChannel::write_reg(int reg_num, uint8_t value)
|
|
{
|
|
switch (reg_num) {
|
|
case 3:
|
|
if ((this->write_regs[3] ^ value) & 0x10) {
|
|
this->write_regs[3] |= 0x10;
|
|
this->read_regs[0] |= 0x10; // set SYNC_HUNT flag
|
|
LOG_F(9, "ESCC: Hunt mode entered.");
|
|
}
|
|
if ((this->write_regs[3] ^ value) & 1) {
|
|
if (value & 1) {
|
|
this->write_regs[3] |= 0x1;
|
|
this->chario->rcv_enable();
|
|
LOG_F(9, "ESCC: receiver enabled.");
|
|
} else {
|
|
this->write_regs[3] ^= 0x1;
|
|
this->chario->rcv_disable();
|
|
LOG_F(9, "ESCC: receiver disabled.");
|
|
this->write_regs[3] |= 0x10; // enter HUNT mode
|
|
this->read_regs[0] |= 0x10; // set SYNC_HUNT flag
|
|
}
|
|
}
|
|
this->write_regs[3] = (this->write_regs[3] & 0x11) | (value & 0xEE);
|
|
return;
|
|
case 7:
|
|
if (this->write_regs[15] & 1) {
|
|
this->wr7_enh = value;
|
|
return;
|
|
}
|
|
break;
|
|
case 14:
|
|
switch (value >> 5) {
|
|
case DPLL_NULL_CMD:
|
|
break;
|
|
case DPLL_ENTER_SRC_MODE:
|
|
this->dpll_active = 1;
|
|
this->read_regs[10] &= 0x3F;
|
|
break;
|
|
case DPLL_DISABLE:
|
|
this->dpll_active = 0;
|
|
// fallthrough
|
|
case DPLL_RST_MISSING_CLK:
|
|
this->read_regs[10] &= 0x3F;
|
|
break;
|
|
case DPLL_SET_SRC_BGR:
|
|
this->dpll_clock_src = 0;
|
|
break;
|
|
case DPLL_SET_SRC_RTXC:
|
|
this->dpll_clock_src = 1;
|
|
break;
|
|
case DPLL_SET_FM_MODE:
|
|
this->dpll_mode = DpllMode::FM;
|
|
break;
|
|
case DPLL_SET_NRZI_MODE:
|
|
this->dpll_mode = DpllMode::NRZI;
|
|
break;
|
|
default:
|
|
LOG_F(WARNING, "ESCC: unimplemented DPLL command %d", value >> 5);
|
|
}
|
|
if (value & 0x1C) { // Local Loopback, Auto Echo DTR/REQ bits set
|
|
LOG_F(WARNING, "ESCC: unexpected value in WR14 = 0x%X", value);
|
|
}
|
|
if (this->brg_active ^ (value & 1)) {
|
|
this->brg_active = value & 1;
|
|
LOG_F(9, "ESCC: BRG %s", this->brg_active ? "enabled" : "disabled");
|
|
}
|
|
return;
|
|
}
|
|
|
|
this->write_regs[reg_num] = value;
|
|
}
|
|
|
|
uint8_t EsccChannel::read_reg(int reg_num)
|
|
{
|
|
if (!reg_num) {
|
|
if (this->chario->rcv_char_available()) {
|
|
this->read_regs[0] |= 1;
|
|
}
|
|
}
|
|
return this->read_regs[reg_num];
|
|
}
|
|
|
|
void EsccChannel::send_byte(uint8_t value)
|
|
{
|
|
// TODO: put one byte into the Data FIFO
|
|
|
|
this->chario->xmit_char(value);
|
|
}
|
|
|
|
uint8_t EsccChannel::receive_byte()
|
|
{
|
|
// TODO: remove one byte from the Receive FIFO
|
|
|
|
uint8_t c;
|
|
|
|
this->chario->rcv_char(&c);
|
|
this->read_regs[0] &= ~1;
|
|
return c;
|
|
}
|
|
|
|
static const vector<string> CharIoBackends = {"null", "stdio", "socket"};
|
|
|
|
static const PropMap Escc_Properties = {
|
|
{"serial_backend", new StrProperty("null", CharIoBackends)},
|
|
};
|
|
|
|
static const DeviceDescription Escc_Descriptor = {
|
|
EsccController::create, {}, Escc_Properties
|
|
};
|
|
|
|
REGISTER_DEVICE(Escc, Escc_Descriptor);
|