diff mbox series

[v2,40/42] esp: add trivial implementation of the ESP_RFLAGS register

Message ID 20210209193018.31339-41-mark.cave-ayland@ilande.co.uk
State New
Headers show
Series esp: consolidate PDMA transfer buffers and other fixes | expand

Commit Message

Mark Cave-Ayland Feb. 9, 2021, 7:30 p.m. UTC 
The bottom 5 bits contain the number of bytes remaining in the FIFO which is
trivial to implement with Fifo8 (the remaining bits are unimplemented and left
as 0 for now).

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/scsi/esp.c | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Philippe Mathieu-Daudé Feb. 23, 2021, 6:51 p.m. UTC | #1 
On 2/9/21 8:30 PM, Mark Cave-Ayland wrote:
> The bottom 5 bits contain the number of bytes remaining in the FIFO which is
> trivial to implement with Fifo8 (the remaining bits are unimplemented and left
> as 0 for now).
> 
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
>  hw/scsi/esp.c | 4 ++++
>  1 file changed, 4 insertions(+)

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Laurent Vivier March 3, 2021, 8:19 p.m. UTC | #2 
Le 09/02/2021 à 20:30, Mark Cave-Ayland a écrit :
> The bottom 5 bits contain the number of bytes remaining in the FIFO which is
> trivial to implement with Fifo8 (the remaining bits are unimplemented and left
> as 0 for now).
> 
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
>  hw/scsi/esp.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
> index 9dd9947307..1f01f2314b 100644
> --- a/hw/scsi/esp.c
> +++ b/hw/scsi/esp.c
> @@ -825,6 +825,10 @@ uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
>              val = s->rregs[saddr];
>          }
>          break;
> +     case ESP_RFLAGS:
> +        /* Bottom 5 bits indicate number of bytes in FIFO */
> +        val = fifo8_num_used(&s->fifo);
> +        break;
>      default:
>          val = s->rregs[saddr];
>          break;
> 

Reviewed-by: Laurent Vivier <laurent@vivier.eu>
diff mbox series

Patch

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index 9dd9947307..1f01f2314b 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -825,6 +825,10 @@  uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
             val = s->rregs[saddr];
         }
         break;
+     case ESP_RFLAGS:
+        /* Bottom 5 bits indicate number of bytes in FIFO */
+        val = fifo8_num_used(&s->fifo);
+        break;
     default:
         val = s->rregs[saddr];
         break;