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escc: implement reset commands.

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This commit is contained in:
Maxim Poliakovski 2022-02-23 22:23:02 +01:00
parent c946693450
commit 205b5a4956
2 changed files with 83 additions and 2 deletions
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72
devices/serial/escc.cpp
View File

@ -1,6 +1,6 @@
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 divingkatae and maximum
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
@ -35,16 +35,27 @@ EsccController::EsccController()
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)
{
switch(reg_offset) {
case EsccReg::Port_B_Cmd:
LOG_F(9, "ESCC: reading Port B register RR%d", this->reg_ptr);
this->reg_ptr = 0;
return this->ch_b->read_reg(reg_offset);
break;
case EsccReg::Port_A_Cmd:
LOG_F(9, "ESCC: reading Port A register RR%d", this->reg_ptr);
this->reg_ptr = 0;
return this->ch_a->read_reg(reg_offset);
break;
default:
LOG_F(INFO, "ESCC: reading register %d", reg_offset);
@ -70,7 +81,29 @@ void EsccController::write(uint8_t reg_offset, uint8_t value)
void EsccController::write_internal(EsccChannel *ch, uint8_t value)
{
if (this->reg_ptr) {
ch->write_reg(this->reg_ptr, value);
// 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;
@ -82,9 +115,44 @@ void EsccController::write_internal(EsccChannel *ch, uint8_t value)
}
}
// ======================== ESCC Channel methods ==============================
void EsccChannel::reset(bool hw_reset)
{
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;
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)
{
this->write_regs[reg_num] = value;
LOG_F(9, "ESCC: writing 0x%X to Channel %s WR%d", value, this->name.c_str(),
reg_num);
}
uint8_t EsccChannel::read_reg(int reg_num)
{
return 0;
}

13
devices/serial/escc.h
View File

@ -50,16 +50,26 @@ enum WR0Cmd : uint8_t {
Point_High = 1,
};
/** ESCC reset commands. */
enum {
RESET_ESCC = 0xC0,
RESET_CH_A = 0x80,
RESET_CH_B = 0x40
};
/** ESCC Channel class. */
class EsccChannel {
public:
EsccChannel(std::string name) { this->name = name; };
~EsccChannel() = default;
void reset(bool hw_reset);
uint8_t read_reg(int reg_num);
void write_reg(int reg_num, uint8_t value);
private:
std::string name;
uint8_t read_regs[16];
uint8_t write_regs[16];
};
@ -74,12 +84,15 @@ public:
void write(uint8_t reg_offset, uint8_t value);
private:
void reset();
void write_internal(EsccChannel* ch, uint8_t value);
std::unique_ptr<EsccChannel> ch_a;
std::unique_ptr<EsccChannel> ch_b;
int reg_ptr; // register pointer for reading/writing (same for both channels)
uint8_t master_int_cntrl;
uint8_t int_vec;
};
#endif // ESCC_H