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esp: introduce esp_get_stc() 

This function simplifies reading the STC 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: <20210304221103.6369-11-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-03-04 22:10:31 +00:00
parent c47b5835f5
commit c04ed569b0
1 changed files with 12 additions and 3 deletions
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15
hw/scsi/esp.c
View File

@ -116,6 +116,17 @@ static void esp_set_tc(ESPState *s, uint32_t dmalen)
s->rregs[ESP_TCHI] = dmalen >> 16;
}
static uint32_t esp_get_stc(ESPState *s)
{
uint32_t dmalen;
dmalen = s->wregs[ESP_TCLO];
dmalen |= s->wregs[ESP_TCMID] << 8;
dmalen |= s->wregs[ESP_TCHI] << 16;
return dmalen;
}
static void set_pdma(ESPState *s, enum pdma_origin_id origin,
uint32_t index, uint32_t len)
{
@ -687,9 +698,7 @@ void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val)
if (val & CMD_DMA) {
s->dma = 1;
/* Reload DMA counter. */
s->rregs[ESP_TCLO] = s->wregs[ESP_TCLO];
s->rregs[ESP_TCMID] = s->wregs[ESP_TCMID];
s->rregs[ESP_TCHI] = s->wregs[ESP_TCHI];
esp_set_tc(s, esp_get_stc(s));
} else {
s->dma = 0;
}