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esp.c: introduce esp_update_drq() and update esp_fifo_{push, pop}_buf() to use it

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This new function sets the DRQ line correctly according to the current transfer
mode, direction and FIFO contents. Update esp_fifo_push_buf() and esp_fifo_pop_buf()
to use it so that DRQ is always set correctly when reading/writing multiple bytes
to/from the FIFO.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20240324191707.623175-15-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 2024-03-24 19:17:03 +00:00
parent 2c1017bfc2
commit 743d873645
1 changed files with 47 additions and 1 deletions
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48
hw/scsi/esp.c
View file

@ -124,6 +124,48 @@ void esp_request_cancelled(SCSIRequest *req)
}
}
static void esp_update_drq(ESPState *s)
{
bool to_device;
switch (esp_get_phase(s)) {
case STAT_MO:
case STAT_CD:
case STAT_DO:
to_device = true;
break;
case STAT_DI:
case STAT_ST:
case STAT_MI:
to_device = false;
break;
default:
return;
}
if (s->dma) {
/* DMA request so update DRQ according to transfer direction */
if (to_device) {
if (fifo8_num_free(&s->fifo) < 2) {
esp_lower_drq(s);
} else {
esp_raise_drq(s);
}
} else {
if (fifo8_num_used(&s->fifo) < 2) {
esp_lower_drq(s);
} else {
esp_raise_drq(s);
}
}
} else {
/* Not a DMA request */
esp_lower_drq(s);
}
}
static void esp_fifo_push(ESPState *s, uint8_t val)
{
if (fifo8_num_used(&s->fifo) == s->fifo.capacity) {
@ -137,6 +179,7 @@ static void esp_fifo_push(ESPState *s, uint8_t val)
static void esp_fifo_push_buf(ESPState *s, uint8_t *buf, int len)
{
fifo8_push_all(&s->fifo, buf, len);
esp_update_drq(s);
}
static uint8_t esp_fifo_pop(ESPState *s)
@ -180,7 +223,10 @@ static uint32_t esp_fifo8_pop_buf(Fifo8 *fifo, uint8_t *dest, int maxlen)
static uint32_t esp_fifo_pop_buf(ESPState *s, uint8_t *dest, int maxlen)
{
return esp_fifo8_pop_buf(&s->fifo, dest, maxlen);
uint32_t len = esp_fifo8_pop_buf(&s->fifo, dest, maxlen);
esp_update_drq(s);
return len;
}
static uint32_t esp_get_tc(ESPState *s)