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sc53c94: support selection and command transfer.

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This commit is contained in:
Maxim Poliakovski 2022-10-25 02:48:21 +02:00
parent c51ea575ca
commit 4f6bd16f3a
1 changed files with 28 additions and 6 deletions
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34
devices/common/scsi/sc53c94.cpp
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@ -30,6 +30,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
#include <machines/machinebase.h>
#include <cinttypes>
#include <cstring>
Sc53C94::Sc53C94(uint8_t chip_id, uint8_t my_id) : ScsiDevice(my_id)
{
@ -172,7 +173,7 @@ void Sc53C94::update_command_reg(uint8_t cmd)
void Sc53C94::exec_command()
{
uint8_t cmd = this->cmd_fifo[0] & 0x7F;
uint8_t cmd = this->cur_cmd = this->cmd_fifo[0] & 0x7F;
bool is_dma_cmd = !!(this->cmd_fifo[0] & 0x80);
if (is_dma_cmd) {
@ -192,7 +193,7 @@ void Sc53C94::exec_command()
exec_next_command();
break;
case CMD_CLEAR_FIFO:
this->data_fifo_pos = 0; // set the bottom of the FIFO to zero
this->data_fifo_pos = 0; // set the bottom of the data FIFO to zero
this->data_fifo[0] = 0;
exec_next_command();
break;
@ -225,7 +226,7 @@ void Sc53C94::exec_command()
this->seq_step = 0;
this->cmd_steps = sel_no_atn_desc;
this->cur_state = SeqState::BUS_FREE;
sequencer();
this->sequencer();
LOG_F(INFO, "SC53C94: SELECT W/O ATN command started");
break;
case CMD_ENA_SEL_RESEL:
@ -316,6 +317,7 @@ void Sc53C94::sequencer()
break;
case SeqState::SEL_END:
if (this->bus_obj->end_selection(this->my_bus_id, this->target_id)) {
this->bus_obj->release_ctrl_line(this->my_bus_id, SCSI_CTRL_SEL);
LOG_F(INFO, "SC53C94: selection completed");
this->cmd_steps++;
} else { // selection timeout
@ -327,6 +329,9 @@ void Sc53C94::sequencer()
exec_next_command();
}
break;
case SeqState::CMD_BEGIN:
LOG_F(INFO, "CMD_BEGIN reached");
break;
default:
ABORT_F("SC53C94: unimplemented sequencer state %d", this->cur_state);
}
@ -345,12 +350,22 @@ void Sc53C94::update_irq()
void Sc53C94::notify(ScsiBus* bus_obj, ScsiMsg msg_type, int param)
{
switch (msg_type) {
case ScsiMsg::BUS_PHASE_CHANGE:
switch (param) {
case ScsiPhase::COMMAND:
this->cur_state = SeqState::CMD_BEGIN;
this->sequencer();
break;
default:
LOG_F(WARNING, "SC53C94: ignore bus phase change %d message", param);
}
break;
case ScsiMsg::CONFIRM_SEL:
if (this->target_id == param) {
// cancel selection timeout timer
TimerManager::get_instance()->cancel_timer(this->seq_timer_id);
this->cur_state = SeqState::SEL_END;
sequencer();
this->sequencer();
} else {
LOG_F(WARNING, "SC53C94: ignore invalid selection confirmation message");
}
@ -362,11 +377,18 @@ void Sc53C94::notify(ScsiBus* bus_obj, ScsiMsg msg_type, int param)
bool Sc53C94::send_bytes(uint8_t* dst_ptr, int count)
{
if ((this->data_fifo_pos - this->data_fifo_read_pos) < count) {
if (this->data_fifo_pos < count) {
return false;
}
std::memcpy(dst_ptr, &this->data_fifo[this->data_fifo_read_pos], count);
// move data out of the data FIFO
std::memcpy(dst_ptr, this->data_fifo, count);
// remove the just readed data from the data FIFO
this->data_fifo_pos -= count;
if (this->data_fifo_pos > 0) {
std::memcpy(this->data_fifo, &this->data_fifo[count], this->data_fifo_pos);
}
return true;
}