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sc53c94: preliminary support for CMD_XFER_PAD_BYTES.

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MkLinux uses this command during synchronous transfer
negotiation.
This commit is contained in:
Maxim Poliakovski
2025-04-11 15:56:03 +02:00
parent a75d806108
commit 4312450b70
2 changed files with 19 additions and 4 deletions
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17
devices/common/scsi/sc53c94.cpp
View File

@@ -345,6 +345,21 @@ void Sc53C94::exec_command()
this->update_irq();
exec_next_command();
break;
case CMD_XFER_PAD_BYTES:
if (this->bus_obj->current_phase() != ScsiPhase::COMMAND)
ABORT_F("%s: unsupported phase %d in CMD_XFER_PAD_BYTES",
this->name.c_str(), this->bus_obj->current_phase());
std::memset(this->data_fifo, 0, DATA_FIFO_MAX);
// FIXME: does the non-DMA version of this command use the transfer counter?
this->data_fifo_pos = std::min((int)this->set_xfer_count, DATA_FIFO_MAX);
this->cur_state = SeqState::SEND_CMD;
this->sequencer();
if (this->bus_obj->current_phase() != ScsiPhase::COMMAND) {
this->int_status |= INTSTAT_SR;
this->update_irq();
exec_next_command();
}
break;
case CMD_RESET_ATN:
this->bus_obj->release_ctrl_line(this->my_bus_id, SCSI_CTRL_ATN);
exec_next_command();
@@ -407,8 +422,6 @@ void Sc53C94::exec_next_command()
}
}
constexpr auto DATA_FIFO_MAX = 16;
void Sc53C94::fifo_push(const uint8_t data)
{
if (this->data_fifo_pos < DATA_FIFO_MAX) {

6
devices/common/scsi/sc53c94.h
View File

@@ -94,7 +94,7 @@ enum {
CMD_XFER = 0x10,
CMD_COMPLETE_STEPS = 0x11,
CMD_MSG_ACCEPTED = 0x12,
//CMD_TRANSFER_PAD_BYTES = 0x18,
CMD_XFER_PAD_BYTES = 0x18,
CMD_SET_ATN = 0x1A, // no interrupt
CMD_RESET_ATN = 0x1B, // no interrupt
@@ -182,6 +182,8 @@ namespace SeqState {
};
};
constexpr auto DATA_FIFO_MAX = 16;
/** Sequence descriptor for multistep commands. */
typedef struct {
int step_num;
@@ -268,7 +270,7 @@ private:
uint32_t my_timer_id = 0;
uint8_t cmd_fifo[2];
uint8_t data_fifo[16];
uint8_t data_fifo[DATA_FIFO_MAX];
int cmd_fifo_pos = 0;
int data_fifo_pos = 0;
int bytes_out = 0;