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esp: move pdma_len and TC logic into esp_pdma_read()/esp_pdma_write()

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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: <20210304221103.6369-18-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-03-04 22:10:38 +00:00
parent 6e3fafa8bb
commit 8da90e8194
1 changed files with 32 additions and 18 deletions
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50
hw/scsi/esp.c
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@ -153,22 +153,45 @@ static uint8_t *get_pdma_buf(ESPState *s)
static uint8_t esp_pdma_read(ESPState *s)
{
uint32_t dmalen = esp_get_tc(s);
uint8_t val;
if (dmalen == 0 || s->pdma_len == 0) {
return 0;
}
switch (s->pdma_origin) {
case PDMA:
return s->pdma_buf[s->pdma_cur++];
val = s->pdma_buf[s->pdma_cur++];
break;
case TI:
return s->ti_buf[s->pdma_cur++];
val = s->ti_buf[s->pdma_cur++];
break;
case CMD:
return s->cmdbuf[s->pdma_cur++];
val = s->cmdbuf[s->pdma_cur++];
break;
case ASYNC:
return s->async_buf[s->pdma_cur++];
val = s->async_buf[s->pdma_cur++];
break;
default:
g_assert_not_reached();
}
s->pdma_len--;
dmalen--;
esp_set_tc(s, dmalen);
return val;
}
static void esp_pdma_write(ESPState *s, uint8_t val)
{
uint32_t dmalen = esp_get_tc(s);
if (dmalen == 0 || s->pdma_len == 0) {
return;
}
switch (s->pdma_origin) {
case PDMA:
s->pdma_buf[s->pdma_cur++] = val;
@ -185,6 +208,10 @@ static void esp_pdma_write(ESPState *s, uint8_t val)
default:
g_assert_not_reached();
}
s->pdma_len--;
dmalen--;
esp_set_tc(s, dmalen);
}
static int get_cmd_cb(ESPState *s)
@ -944,27 +971,18 @@ 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);
trace_esp_pdma_write(size);
if (dmalen == 0 || s->pdma_len == 0) {
return;
}
switch (size) {
case 1:
esp_pdma_write(s, val);
s->pdma_len--;
dmalen--;
break;
case 2:
esp_pdma_write(s, val >> 8);
esp_pdma_write(s, val);
s->pdma_len -= 2;
dmalen -= 2;
break;
}
esp_set_tc(s, dmalen);
if (s->pdma_len == 0 && s->pdma_cb) {
esp_lower_drq(s);
s->pdma_cb(s);
@ -988,17 +1006,13 @@ static uint64_t sysbus_esp_pdma_read(void *opaque, hwaddr addr,
switch (size) {
case 1:
val = esp_pdma_read(s);
s->pdma_len--;
dmalen--;
break;
case 2:
val = esp_pdma_read(s);
val = (val << 8) | esp_pdma_read(s);
s->pdma_len -= 2;
dmalen -= 2;
break;
}
esp_set_tc(s, dmalen);
dmalen = esp_get_tc(s);
if (dmalen == 0 || (s->pdma_len == 0 && s->pdma_cb)) {
esp_lower_drq(s);
s->pdma_cb(s);