mirror of
https://github.com/dingusdev/dingusppc.git
synced 2024-08-30 19:29:39 +00:00
248 lines
7.6 KiB
C++
248 lines
7.6 KiB
C++
/*
|
|
DingusPPC - The Experimental PowerPC Macintosh emulator
|
|
Copyright (C) 2018-23 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 DisplayID class implementation. */
|
|
|
|
#include <devices/video/displayid.h>
|
|
#include <loguru.hpp>
|
|
#include <machines/machineproperties.h>
|
|
|
|
#include <cinttypes>
|
|
#include <map>
|
|
#include <string>
|
|
|
|
/** Mapping between monitor IDs and their sense codes. */
|
|
static const std::map<std::string, uint16_t> MonitorIdToCode = {
|
|
{ "MacColor21in" , 0x00FF },
|
|
{ "PortraitGS" , 0x01FF },
|
|
{ "MacRGB12in" , 0x02FF },
|
|
{ "TwoPageGS" , 0x03FF },
|
|
{ "NTSC" , 0x04FF },
|
|
{ "MacRGB15in" , 0x05FF },
|
|
{ "HiRes12-14in" , 0x06FF },
|
|
{ "Multiscan15in" , 0x0603 },
|
|
{ "Multiscan17in" , 0x060B },
|
|
{ "Multiscan20in" , 0x0623 },
|
|
{ "AppleVision1710" , 0x062B }, // this code is assigned to several different monitors!
|
|
{ "PALEncoder" , 0x0700 }, // no clue what it means
|
|
{ "NTSCEncoder" , 0x0714 }, // no clue what it means
|
|
{ "VGA-SVGA" , 0x0717 },
|
|
{ "MacRGB16in" , 0x072D },
|
|
{ "MacRGB19in" , 0x073A },
|
|
{ "PAL" , 0x0730 },
|
|
{ "NotConnected" , 0x07FF }
|
|
};
|
|
|
|
DisplayID::DisplayID()
|
|
{
|
|
// assume a DDC monitor is connected by default
|
|
this->id_kind = Disp_Id_Kind::DDC2B;
|
|
|
|
std::string mon_id = GET_STR_PROP("mon_id");
|
|
if (!mon_id.empty()) {
|
|
if (MonitorIdToCode.count(mon_id)) {
|
|
auto sense_code = MonitorIdToCode.at(mon_id);
|
|
this->std_sense_code = (sense_code >> 8) & 0xFFU;
|
|
this->ext_sense_code = (sense_code >> 0) & 0xFFU;
|
|
this->id_kind = Disp_Id_Kind::AppleSense;
|
|
LOG_F(INFO, "DisplayID mode set to AppleSense");
|
|
LOG_F(INFO, "Standard sense code: 0x%d", this->std_sense_code);
|
|
LOG_F(INFO, "Extended sense code: 0x%X", this->ext_sense_code);
|
|
}
|
|
}
|
|
|
|
/* Initialize DDC I2C bus */
|
|
this->next_state = I2CState::STOP;
|
|
this->prev_state = I2CState::STOP;
|
|
this->last_sda = 1;
|
|
this->last_scl = 1;
|
|
this->data_ptr = 0;
|
|
this->data_pos = 0;
|
|
}
|
|
|
|
DisplayID::DisplayID(uint8_t std_code, uint8_t ext_code)
|
|
{
|
|
this->id_kind = Disp_Id_Kind::AppleSense;
|
|
|
|
this->std_sense_code = std_code;
|
|
this->ext_sense_code = ext_code;
|
|
}
|
|
|
|
uint8_t DisplayID::read_monitor_sense(uint8_t levels, uint8_t dirs)
|
|
{
|
|
uint8_t scl, sda;
|
|
|
|
switch(this->id_kind) {
|
|
case Disp_Id_Kind::DDC2B:
|
|
/* If GPIO pins are in the output mode, pick up their levels.
|
|
In the input mode, GPIO pins will be read "high" */
|
|
scl = (dirs & 2) ? !!(levels & 2) : 1;
|
|
sda = (dirs & 4) ? !!(levels & 4) : 1;
|
|
|
|
return update_ddc_i2c(sda, scl);
|
|
case Disp_Id_Kind::AppleSense:
|
|
switch ((dirs << 3) | levels) {
|
|
case 0x23: // Sense line 2 pulled low
|
|
return ((this->ext_sense_code >> 4) & 3);
|
|
case 0x15: // Sense line 1 pulled low
|
|
return (((this->ext_sense_code & 8) >> 1) |
|
|
((this->ext_sense_code & 4) >> 2));
|
|
case 0xE: // Sense line 0 pulled low
|
|
return ((this->ext_sense_code & 3) << 1);
|
|
default:
|
|
return this->std_sense_code;
|
|
}
|
|
}
|
|
}
|
|
|
|
uint8_t DisplayID::set_result(uint8_t sda, uint8_t scl)
|
|
{
|
|
uint16_t data_out;
|
|
|
|
this->last_sda = sda;
|
|
this->last_scl = scl;
|
|
|
|
data_out = 0;
|
|
|
|
if (scl) {
|
|
data_out |= 2;
|
|
}
|
|
|
|
if (sda) {
|
|
data_out |= 4;
|
|
}
|
|
|
|
return data_out;
|
|
}
|
|
|
|
uint8_t DisplayID::update_ddc_i2c(uint8_t sda, uint8_t scl)
|
|
{
|
|
bool clk_gone_high = false;
|
|
|
|
if (scl != this->last_scl) {
|
|
this->last_scl = scl;
|
|
if (scl) {
|
|
clk_gone_high = true;
|
|
}
|
|
}
|
|
|
|
if (sda != this->last_sda) {
|
|
/* START = SDA goes high to low while SCL is high */
|
|
/* STOP = SDA goes low to high while SCL is high */
|
|
if (this->last_scl) {
|
|
if (!sda) {
|
|
LOG_F(9, "DDC-I2C: START condition detected!");
|
|
this->next_state = I2CState::DEV_ADDR;
|
|
this->bit_count = 0;
|
|
} else {
|
|
LOG_F(9, "DDC-I2C: STOP condition detected!");
|
|
this->next_state = I2CState::STOP;
|
|
}
|
|
}
|
|
return set_result(sda, scl);
|
|
}
|
|
|
|
if (!clk_gone_high) {
|
|
return set_result(sda, scl);
|
|
}
|
|
|
|
switch (this->next_state) {
|
|
case I2CState::STOP:
|
|
break;
|
|
|
|
case I2CState::ACK:
|
|
this->bit_count = 0;
|
|
this->byte = 0;
|
|
switch (this->prev_state) {
|
|
case I2CState::DEV_ADDR:
|
|
if ((dev_addr & 0xFE) == 0xA0) {
|
|
sda = 0; /* send ACK */
|
|
} else {
|
|
LOG_F(ERROR, "DDC-I2C: unknown device address 0x%X", this->dev_addr);
|
|
sda = 1; /* send NACK */
|
|
}
|
|
if (this->dev_addr & 1) {
|
|
this->next_state = I2CState::DATA;
|
|
this->data_ptr = this->edid;
|
|
this->data_pos = 0;
|
|
this->byte = this->data_ptr[this->data_pos++];
|
|
} else {
|
|
this->next_state = I2CState::REG_ADDR;
|
|
}
|
|
break;
|
|
case I2CState::REG_ADDR:
|
|
this->next_state = I2CState::DATA;
|
|
if (!this->reg_addr) {
|
|
sda = 0; /* send ACK */
|
|
} else {
|
|
LOG_F(ERROR, "DDC-I2C: unknown register address 0x%X", this->reg_addr);
|
|
sda = 1; /* send NACK */
|
|
}
|
|
break;
|
|
case I2CState::DATA:
|
|
this->next_state = I2CState::DATA;
|
|
if (dev_addr & 1) {
|
|
if (!sda) {
|
|
/* load next data byte */
|
|
if (data_pos < 128)
|
|
this->byte = this->data_ptr[this->data_pos++];
|
|
else
|
|
this->byte = 0;
|
|
} else {
|
|
LOG_F(ERROR, "DDC-I2C: Oops! NACK received");
|
|
}
|
|
} else {
|
|
sda = 0; /* send ACK */
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case I2CState::DEV_ADDR:
|
|
case I2CState::REG_ADDR:
|
|
this->byte = (this->byte << 1) | this->last_sda;
|
|
if (this->bit_count++ >= 7) {
|
|
this->bit_count = 0;
|
|
this->prev_state = this->next_state;
|
|
this->next_state = I2CState::ACK;
|
|
if (this->prev_state == I2CState::DEV_ADDR) {
|
|
LOG_F(9, "DDC-I2C: device address received, addr=0x%X", this->byte);
|
|
this->dev_addr = this->byte;
|
|
} else {
|
|
LOG_F(9, "DDC-I2C: register address received, addr=0x%X", this->byte);
|
|
this->reg_addr = this->byte;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case I2CState::DATA:
|
|
sda = (this->byte >> (7 - this->bit_count)) & 1;
|
|
if (this->bit_count++ >= 7) {
|
|
this->bit_count = 0;
|
|
this->prev_state = this->next_state;
|
|
this->next_state = I2CState::ACK;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return set_result(sda, scl);
|
|
}
|