haraldwolff/qemu-patch-raspberry4
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esp: remove dma_counter from ESPState

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The value of dma_counter is set once at the start of the transfer and remains
the same until the transfer is complete. This allows the check in esp_transfer_data
to be simplified since dma_left will always be non-zero until the transfer is
completed.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210304221103.6369-13-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-03-04 22:10:33 +00:00
parent 96676c2f74
commit 5eb7a23fb2
2 changed files with 1 additions and 6 deletions
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4
hw/scsi/esp.c
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@ -229,7 +229,6 @@ static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid)
if (datalen != 0) {
s->rregs[ESP_RSTAT] = STAT_TC;
s->dma_left = 0;
s->dma_counter = 0;
if (datalen > 0) {
s->rregs[ESP_RSTAT] |= STAT_DI;
} else {
@ -542,7 +541,7 @@ void esp_transfer_data(SCSIRequest *req, uint32_t len)
s->async_buf = scsi_req_get_buf(req);
if (s->dma_left) {
esp_do_dma(s);
} else if (s->dma_counter != 0 && s->ti_size <= 0) {
} else if (s->ti_size <= 0) {
/*
* If this was the last part of a DMA transfer then the
* completion interrupt is deferred to here.
@ -561,7 +560,6 @@ static void handle_ti(ESPState *s)
}
dmalen = esp_get_tc(s);
s->dma_counter = dmalen;
if (s->do_cmd) {
minlen = (dmalen < ESP_CMDBUF_SZ) ? dmalen : ESP_CMDBUF_SZ;

3
include/hw/scsi/esp.h
View file

@ -50,9 +50,6 @@ struct ESPState {
/* The amount of data left in the current DMA transfer. */
uint32_t dma_left;
/* The size of the current DMA transfer. Zero if no transfer is in
progress. */
uint32_t dma_counter;
int dma_enabled;
uint32_t async_len;