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sc53c94: fix setting internal transfer counter.

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This commit is contained in:
Maxim Poliakovski 2022-10-31 23:10:22 +01:00
parent 3f2b77fd59
commit c7ceb9d6b9
2 changed files with 13 additions and 1 deletions
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12
devices/common/scsi/sc53c94.cpp
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@ -111,6 +111,12 @@ uint8_t Sc53C94::read(uint8_t reg_offset)
void Sc53C94::write(uint8_t reg_offset, uint8_t value)
{
switch (reg_offset) {
case Write::Reg53C94::Xfer_Cnt_LSB:
this->set_xfer_count = (this->set_xfer_count & ~0xFFU) | value;
break;
case Write::Reg53C94::Xfer_Cnt_MSB:
this->set_xfer_count = (this->set_xfer_count & ~0xFF00U) | (value << 8);
break;
case Write::Reg53C94::Command:
update_command_reg(value);
break;
@ -184,6 +190,9 @@ void Sc53C94::exec_command()
this->xfer_count = this->set_xfer_count & 0xFFFFFFUL;
} else { // standard mode: 16-bit
this->xfer_count = this->set_xfer_count & 0xFFFFUL;
if (!this->xfer_count) {
this->xfer_count = 65536;
}
}
}
@ -240,6 +249,7 @@ void Sc53C94::exec_command()
LOG_F(ERROR, "SC53C94: invalid/unimplemented command 0x%X", cmd);
this->cmd_fifo_pos--; // remove invalid command from FIFO
this->int_status |= INTSTAT_ICMD;
this->update_irq();
}
}
@ -256,7 +266,7 @@ void Sc53C94::exec_next_command()
void Sc53C94::fifo_push(const uint8_t data)
{
if (this->data_fifo_pos < 16) {
if (this->data_fifo_pos < DATA_FIFO_MAX) {
this->data_fifo[this->data_fifo_pos++] = data;
} else {
LOG_F(ERROR, "SC53C94: data FIFO overflow!");

2
devices/common/scsi/sc53c94.h
View File

@ -35,6 +35,8 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
#include <cinttypes>
#include <memory>
#define DATA_FIFO_MAX 16
/** 53C94 read registers */
namespace Read {
enum Reg53C94 : uint8_t {