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mesh: fix writes to BusStatus0 & BusStatus1 registers.

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This commit is contained in:
Maxim Poliakovski 2024-07-24 17:48:57 +02:00
parent ebc618adea
commit 19ecc4f945
2 changed files with 35 additions and 12 deletions
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46
devices/common/scsi/mesh.cpp
View File

@ -115,19 +115,11 @@ void MeshController::write(uint8_t reg_offset, uint8_t value) {
case MeshReg::Sequence:
perform_command(value);
break;
case MeshReg::BusStatus0:
this->update_bus_status((this->bus_stat & 0xFF00U) | value);
break;
case MeshReg::BusStatus1:
new_stat = value << 8;
if (new_stat != this->bus_stat) {
for (uint16_t mask = SCSI_CTRL_RST; mask >= SCSI_CTRL_SEL; mask >>= 1) {
if ((new_stat ^ this->bus_stat) & mask) {
if (new_stat & mask)
this->bus_obj->assert_ctrl_line(this->src_id, mask);
else
this->bus_obj->release_ctrl_line(this->src_id, mask);
}
}
this->bus_stat = new_stat;
}
this->update_bus_status((this->bus_stat & 0xFFU) | (value << 8));
break;
case MeshReg::IntMask:
this->int_mask = value;
@ -248,6 +240,36 @@ void MeshController::perform_command(const uint8_t cmd) {
}
}
void MeshController::update_bus_status(const uint16_t new_stat) {
uint16_t mask;
// update the lower part (BusStatus0)
if ((new_stat ^ this->bus_stat) & 0xFF) {
for (mask = SCSI_CTRL_REQ; mask >= SCSI_CTRL_IO; mask >>= 1) {
if ((new_stat ^ this->bus_stat) & mask) {
if (new_stat & mask)
this->bus_obj->assert_ctrl_line(this->src_id, mask);
else
this->bus_obj->release_ctrl_line(this->src_id, mask);
}
}
}
// update the upper part (BusStatus1)
if ((new_stat ^ this->bus_stat) & 0xFF00U) {
for (mask = SCSI_CTRL_RST; mask >= SCSI_CTRL_SEL; mask >>= 1) {
if ((new_stat ^ this->bus_stat) & mask) {
if (new_stat & mask)
this->bus_obj->assert_ctrl_line(this->src_id, mask);
else
this->bus_obj->release_ctrl_line(this->src_id, mask);
}
}
}
this->bus_stat = new_stat;
}
void MeshController::step_completed() {
this->int_stat |= INT_CMD_DONE;
update_irq();

1
devices/common/scsi/mesh.h
View File

@ -141,6 +141,7 @@ public:
protected:
void reset(bool is_hard_reset);
void perform_command(const uint8_t cmd);
void update_bus_status(const uint16_t new_stat);
private:
uint8_t chip_id;