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esp: introduce esp_get_tc() and esp_set_tc() 

These functions simplify reading and writing the TC register value without having to
manually shift each individual 8-bit value.

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: <20210304221103.6369-10-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-03-04 22:10:30 +00:00
parent 4ca2ba6fb0
commit c47b5835f5
1 changed files with 23 additions and 15 deletions
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38
hw/scsi/esp.c
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@ -98,6 +98,24 @@ void esp_request_cancelled(SCSIRequest *req)
}
}
static uint32_t esp_get_tc(ESPState *s)
{
uint32_t dmalen;
dmalen = s->rregs[ESP_TCLO];
dmalen |= s->rregs[ESP_TCMID] << 8;
dmalen |= s->rregs[ESP_TCHI] << 16;
return dmalen;
}
static void esp_set_tc(ESPState *s, uint32_t dmalen)
{
s->rregs[ESP_TCLO] = dmalen;
s->rregs[ESP_TCMID] = dmalen >> 8;
s->rregs[ESP_TCHI] = dmalen >> 16;
}
static void set_pdma(ESPState *s, enum pdma_origin_id origin,
uint32_t index, uint32_t len)
{
@ -157,9 +175,7 @@ static uint32_t get_cmd(ESPState *s, uint8_t *buf, uint8_t buflen)
target = s->wregs[ESP_WBUSID] & BUSID_DID;
if (s->dma) {
dmalen = s->rregs[ESP_TCLO];
dmalen |= s->rregs[ESP_TCMID] << 8;
dmalen |= s->rregs[ESP_TCHI] << 16;
dmalen = esp_get_tc(s);
if (dmalen > buflen) {
return 0;
}
@ -348,9 +364,7 @@ static void esp_dma_done(ESPState *s)
s->rregs[ESP_RINTR] = INTR_BS;
s->rregs[ESP_RSEQ] = 0;
s->rregs[ESP_RFLAGS] = 0;
s->rregs[ESP_TCLO] = 0;
s->rregs[ESP_TCMID] = 0;
s->rregs[ESP_TCHI] = 0;
esp_set_tc(s, 0);
esp_raise_irq(s);
}
@ -535,9 +549,7 @@ static void handle_ti(ESPState *s)
return;
}
dmalen = s->rregs[ESP_TCLO];
dmalen |= s->rregs[ESP_TCMID] << 8;
dmalen |= s->rregs[ESP_TCHI] << 16;
dmalen = esp_get_tc(s);
if (dmalen == 0) {
dmalen = 0x10000;
}
@ -888,9 +900,7 @@ static void sysbus_esp_pdma_write(void *opaque, hwaddr addr,
trace_esp_pdma_write(size);
dmalen = s->rregs[ESP_TCLO];
dmalen |= s->rregs[ESP_TCMID] << 8;
dmalen |= s->rregs[ESP_TCHI] << 16;
dmalen = esp_get_tc(s);
if (dmalen == 0 || s->pdma_len == 0) {
return;
}
@ -907,9 +917,7 @@ static void sysbus_esp_pdma_write(void *opaque, hwaddr addr,
dmalen -= 2;
break;
}
s->rregs[ESP_TCLO] = dmalen & 0xff;
s->rregs[ESP_TCMID] = dmalen >> 8;
s->rregs[ESP_TCHI] = dmalen >> 16;
esp_set_tc(s, dmalen);
if (s->pdma_len == 0 && s->pdma_cb) {
esp_lower_drq(s);
s->pdma_cb(s);