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esp.c: improve ESP_RSEQ logic consolidation 

The ESP_RSEQ logic is scattered in a few places throughout the ESP state machine
which is mainly because the ESP_RSEQ register isn't always reset when executing
an ESP select command. Once this is done, the ESP_RSEQ register only needs to be
updated at the point where the sequencer command completes.

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: <20240112125420.514425-76-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 12:54:07 +00:00
parent 8ba3204893
commit 9b2cdca2d9
1 changed files with 8 additions and 6 deletions
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14
hw/scsi/esp.c
View File

@ -230,6 +230,7 @@ static int esp_select(ESPState *s)
target = s->wregs[ESP_WBUSID] & BUSID_DID;
s->ti_size = 0;
s->rregs[ESP_RSEQ] = SEQ_0;
if (s->current_req) {
/* Started a new command before the old one finished. Cancel it. */
@ -241,7 +242,6 @@ static int esp_select(ESPState *s)
/* No such drive */
s->rregs[ESP_RSTAT] = 0;
s->rregs[ESP_RINTR] = INTR_DC;
s->rregs[ESP_RSEQ] = SEQ_0;
esp_raise_irq(s);
return -1;
}
@ -250,7 +250,6 @@ static int esp_select(ESPState *s)
* Note that we deliberately don't raise the IRQ here: this will be done
* either in esp_transfer_data() or esp_command_complete()
*/
s->rregs[ESP_RSEQ] = SEQ_CD;
return 0;
}
@ -358,7 +357,6 @@ static void handle_s_without_atn(ESPState *s)
}
esp_set_phase(s, STAT_CD);
s->rregs[ESP_RSEQ] = SEQ_CD;
s->cmdfifo_cdb_offset = 0;
if (s->dma) {
@ -380,7 +378,6 @@ static void handle_satn_stop(ESPState *s)
}
esp_set_phase(s, STAT_MO);
s->rregs[ESP_RSEQ] = SEQ_MO;
s->cmdfifo_cdb_offset = 0;
if (s->dma) {
@ -456,6 +453,7 @@ static void esp_do_dma(ESPState *s)
if (fifo8_num_used(&s->cmdfifo) >= 1) {
/* First byte received, switch to command phase */
esp_set_phase(s, STAT_CD);
s->rregs[ESP_RSEQ] = SEQ_CD;
s->cmdfifo_cdb_offset = 1;
if (fifo8_num_used(&s->cmdfifo) > 1) {
@ -468,11 +466,11 @@ static void esp_do_dma(ESPState *s)
case CMD_SELATNS | CMD_DMA:
if (fifo8_num_used(&s->cmdfifo) == 1) {
/* First byte received, stop in message out phase */
s->rregs[ESP_RSEQ] = SEQ_MO;
s->cmdfifo_cdb_offset = 1;
/* Raise command completion interrupt */
s->rregs[ESP_RINTR] |= INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
esp_raise_irq(s);
}
break;
@ -482,7 +480,6 @@ static void esp_do_dma(ESPState *s)
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);
}
@ -726,6 +723,7 @@ static void esp_do_nodma(ESPState *s)
if (fifo8_num_used(&s->cmdfifo) >= 1) {
/* First byte received, switch to command phase */
esp_set_phase(s, STAT_CD);
s->rregs[ESP_RSEQ] = SEQ_CD;
s->cmdfifo_cdb_offset = 1;
if (fifo8_num_used(&s->cmdfifo) > 1) {
@ -738,6 +736,7 @@ static void esp_do_nodma(ESPState *s)
case CMD_SELATNS:
if (fifo8_num_used(&s->cmdfifo) >= 1) {
/* First byte received, stop in message out phase */
s->rregs[ESP_RSEQ] = SEQ_MO;
s->cmdfifo_cdb_offset = 1;
/* Raise command completion interrupt */
@ -903,6 +902,7 @@ void esp_command_complete(SCSIRequest *req, size_t resid)
* and function complete interrupt
*/
s->rregs[ESP_RINTR] |= INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
break;
case CMD_TI | CMD_DMA:
@ -948,6 +948,7 @@ void esp_transfer_data(SCSIRequest *req, uint32_t len)
* so raise deferred bus service and function complete interrupt
*/
s->rregs[ESP_RINTR] |= INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
break;
case CMD_SELATNS | CMD_DMA:
@ -957,6 +958,7 @@ void esp_transfer_data(SCSIRequest *req, uint32_t len)
* completion interrupt
*/
s->rregs[ESP_RINTR] |= INTR_BS;
s->rregs[ESP_RSEQ] = SEQ_MO;
break;
case CMD_TI | CMD_DMA: