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esp.c: zero command register when TI command terminates due to phase change

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This is the behaviour documented in the datasheet and allows the state machine
to correctly process multiple consecutive TI commands.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Helge Deller <deller@gmx.de>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20240112125420.514425-63-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2024-01-12 12:53:54 +00:00
parent 036120f3af
commit cb22ce5038
1 changed files with 8 additions and 0 deletions
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8
hw/scsi/esp.c
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@ -519,6 +519,7 @@ static void esp_do_dma(ESPState *s)
/* ATN remains asserted until TC == 0 */
if (esp_get_tc(s) == 0) {
esp_set_phase(s, STAT_CD);
s->rregs[ESP_CMD] = 0;
s->rregs[ESP_RSEQ] = SEQ_CD;
s->rregs[ESP_RINTR] |= INTR_BS;
esp_raise_irq(s);
@ -717,6 +718,7 @@ static void esp_do_nodma(ESPState *s)
*/
s->cmdfifo_cdb_offset = fifo8_num_used(&s->cmdfifo);
esp_set_phase(s, STAT_CD);
s->rregs[ESP_CMD] = 0;
s->rregs[ESP_RSEQ] = SEQ_CD;
s->rregs[ESP_RINTR] |= INTR_BS;
esp_raise_irq(s);
@ -831,6 +833,11 @@ void esp_command_complete(SCSIRequest *req, size_t resid)
*/
s->rregs[ESP_RINTR] |= INTR_BS | INTR_FC;
break;
case CMD_TI | CMD_DMA:
case CMD_TI:
s->rregs[ESP_CMD] = 0;
break;
}
/* Raise bus service interrupt to indicate change to STATUS phase */
@ -885,6 +892,7 @@ void esp_transfer_data(SCSIRequest *req, uint32_t len)
* Bus service interrupt raised because of initial change to
* DATA phase
*/
s->rregs[ESP_CMD] = 0;
s->rregs[ESP_RINTR] |= INTR_BS;
break;
}