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[PATCH v2 11/42] esp: apply transfer length adjustment when STC is zero
From: |
Mark Cave-Ayland |
Subject: |
[PATCH v2 11/42] esp: apply transfer length adjustment when STC is zero at TC load time |
Date: |
Tue, 9 Feb 2021 19:29:47 +0000 |
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>
---
hw/scsi/esp.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index a1acc2c9bd..02b7876394 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -562,9 +562,6 @@ static void handle_ti(ESPState *s)
}
dmalen = esp_get_tc(s);
- if (dmalen == 0) {
- dmalen = 0x10000;
- }
s->dma_counter = dmalen;
if (s->do_cmd) {
@@ -699,7 +696,11 @@ 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;
}
--
2.20.1
- [PATCH v2 06/42] esp: fix esp_reg_read() trace event, (continued)
- [PATCH v2 06/42] esp: fix esp_reg_read() trace event, Mark Cave-Ayland, 2021/02/09
- [PATCH v2 07/42] esp: add PDMA trace events, Mark Cave-Ayland, 2021/02/09
- [PATCH v2 08/42] esp: determine transfer direction directly from SCSI phase, Mark Cave-Ayland, 2021/02/09
- [PATCH v2 09/42] esp: introduce esp_get_tc() and esp_set_tc(), Mark Cave-Ayland, 2021/02/09
- [PATCH v2 10/42] esp: introduce esp_get_stc(), Mark Cave-Ayland, 2021/02/09
[PATCH v2 11/42] esp: apply transfer length adjustment when STC is zero at TC load time,
Mark Cave-Ayland <=
[PATCH v2 12/42] esp: remove dma_counter from ESPState, Mark Cave-Ayland, 2021/02/09
[PATCH v2 13/42] esp: remove dma_left from ESPState, Mark Cave-Ayland, 2021/02/09
[PATCH v2 14/42] esp: remove minlen restriction in handle_ti, Mark Cave-Ayland, 2021/02/09
[PATCH v2 15/42] esp: introduce esp_pdma_read() and esp_pdma_write() functions, Mark Cave-Ayland, 2021/02/09