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| author | Mark Cave-Ayland | 2021-03-04 23:10:32 +0100 |
|---|---|---|
| committer | Mark Cave-Ayland | 2021-03-07 11:39:05 +0100 |
| commit | 96676c2f749d9da99ee03ec0eee342bd7d09de26 (patch) | |
| tree | 851ddeebaf32c4bc681f3f0b0c85a4a2419b09c9 /hw/scsi/esp.c | |
| parent | esp: introduce esp_get_stc() (diff) | |
| download | qemu-96676c2f749d9da99ee03ec0eee342bd7d09de26.tar.gz qemu-96676c2f749d9da99ee03ec0eee342bd7d09de26.tar.xz qemu-96676c2f749d9da99ee03ec0eee342bd7d09de26.zip | |
esp: apply transfer length adjustment when STC is zero at TC load time
Perform the length adjustment whereby a value of 0 in the STC represents
a transfer length of 0x10000 at the point where the TC is loaded at the
start of a DMA command rather than just when a TI (Transfer Information)
command is executed. This better matches the description as given in the
datasheet.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210304221103.6369-12-mark.cave-ayland@ilande.co.uk>
Diffstat (limited to 'hw/scsi/esp.c')
| -rw-r--r-- | hw/scsi/esp.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 125bdea32a..349067eb6a 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -561,9 +561,6 @@ static void handle_ti(ESPState *s) } dmalen = esp_get_tc(s); - if (dmalen == 0) { - dmalen = 0x10000; - } s->dma_counter = dmalen; if (s->do_cmd) { @@ -698,7 +695,11 @@ void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val) if (val & CMD_DMA) { s->dma = 1; /* Reload DMA counter. */ - esp_set_tc(s, esp_get_stc(s)); + if (esp_get_stc(s) == 0) { + esp_set_tc(s, 0x10000); + } else { + esp_set_tc(s, esp_get_stc(s)); + } } else { s->dma = 0; } |