esp: raise interrupt after every non-DMA byte transferred to the FIFO

This matches the description in the datasheet and is required as support for
non-DMA transfers is added.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210304221103.6369-36-mark.cave-ayland@ilande.co.uk>

1 files changed, 6 insertions, 0 deletions

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index eb6681ca66..4ac299651f 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -760,6 +760,12 @@ void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val)
             s->ti_size++;
             s->ti_buf[s->ti_wptr++] = val & 0xff;
         }
+
+        /* Non-DMA transfers raise an interrupt after every byte */
+        if (s->rregs[ESP_CMD] == CMD_TI) {
+            s->rregs[ESP_RINTR] |= INTR_FC | INTR_BS;
+            esp_raise_irq(s);
+        }
         break;
     case ESP_CMD:
         s->rregs[saddr] = val;