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esp: introduce esp_pdma_read() and esp_pdma_write() functions 

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210304221103.6369-16-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-03-04 22:10:36 +00:00
parent b76624de50
commit 761bef75dd
1 changed files with 20 additions and 8 deletions
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28
hw/scsi/esp.c
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@ -151,6 +151,20 @@ static uint8_t *get_pdma_buf(ESPState *s)
return NULL;
}
static uint8_t esp_pdma_read(ESPState *s)
{
uint8_t *buf = get_pdma_buf(s);
return buf[s->pdma_cur++];
}
static void esp_pdma_write(ESPState *s, uint8_t val)
{
uint8_t *buf = get_pdma_buf(s);
buf[s->pdma_cur++] = val;
}
static int get_cmd_cb(ESPState *s)
{
int target;
@ -909,7 +923,6 @@ static void sysbus_esp_pdma_write(void *opaque, hwaddr addr,
SysBusESPState *sysbus = opaque;
ESPState *s = ESP(&sysbus->esp);
uint32_t dmalen = esp_get_tc(s);
uint8_t *buf = get_pdma_buf(s);
trace_esp_pdma_write(size);
@ -918,13 +931,13 @@ static void sysbus_esp_pdma_write(void *opaque, hwaddr addr,
}
switch (size) {
case 1:
buf[s->pdma_cur++] = val;
esp_pdma_write(s, val);
s->pdma_len--;
dmalen--;
break;
case 2:
buf[s->pdma_cur++] = val >> 8;
buf[s->pdma_cur++] = val;
esp_pdma_write(s, val >> 8);
esp_pdma_write(s, val);
s->pdma_len -= 2;
dmalen -= 2;
break;
@ -943,7 +956,6 @@ static uint64_t sysbus_esp_pdma_read(void *opaque, hwaddr addr,
SysBusESPState *sysbus = opaque;
ESPState *s = ESP(&sysbus->esp);
uint32_t dmalen = esp_get_tc(s);
uint8_t *buf = get_pdma_buf(s);
uint64_t val = 0;
trace_esp_pdma_read(size);
@ -953,13 +965,13 @@ static uint64_t sysbus_esp_pdma_read(void *opaque, hwaddr addr,
}
switch (size) {
case 1:
val = buf[s->pdma_cur++];
val = esp_pdma_read(s);
s->pdma_len--;
dmalen--;
break;
case 2:
val = buf[s->pdma_cur++];
val = (val << 8) | buf[s->pdma_cur++];
val = esp_pdma_read(s);
val = (val << 8) | esp_pdma_read(s);
s->pdma_len -= 2;
dmalen -= 2;
break;