static void
esp_dma_go(struct ncr53c9x_softc *sc)
{
struct esp_softc *esc = (struct esp_softc *)sc;
DMA_GO(esc->sc_dma);
}
int
bppwrite(dev_t dev, struct uio *uio, int flags)
{
struct bpp_softc *sc;
struct lsi64854_softc *lsi;
int error = 0;
int s;
sc = device_lookup_private(&bpp_cd, BPPUNIT(dev));
lsi = &sc->sc_lsi64854;
/*
* Wait until the DMA engine is free.
*/
s = splbpp();
while ((sc->sc_flags & BPP_LOCKED) != 0) {
if ((flags & IO_NDELAY) != 0) {
splx(s);
return EWOULDBLOCK;
}
sc->sc_flags |= BPP_WANT;
error = tsleep(sc->sc_buf, PZERO|PCATCH, "bppwrite", 0);
if (error != 0) {
splx(s);
return error;
}
}
sc->sc_flags |= BPP_LOCKED;
splx(s);
/*
* Move data from user space into our private buffer
* and start DMA.
*/
while (uio->uio_resid > 0) {
uint8_t *bp = sc->sc_buf;
size_t len = min(sc->sc_bufsz, uio->uio_resid);
if ((error = uiomove(bp, len, uio)) != 0)
break;
while (len > 0) {
uint8_t tcr;
size_t size = len;
DMA_SETUP(lsi, &bp, &len, 0, &size);
#ifdef DEBUG
if (bppdebug) {
int i;
uint8_t *b = bp;
printf("bpp: writing %ld : ", len);
for (i = 0; i < len; i++)
printf("%c(0x%x)", b[i], b[i]);
printf("\n");
}
#endif
/* Clear direction control bit */
tcr = bus_space_read_1(lsi->sc_bustag, lsi->sc_regs,
L64854_REG_TCR);
tcr &= ~BPP_TCR_DIR;
bus_space_write_1(lsi->sc_bustag, lsi->sc_regs,
L64854_REG_TCR, tcr);
/* Enable DMA */
s = splbpp();
DMA_GO(lsi);
error = tsleep(sc, PZERO|PCATCH, "bppdma", 0);
splx(s);
if (error != 0)
goto out;
/* Bail out if bottom half reported an error */
if ((error = sc->sc_error) != 0)
goto out;
/*
* lsi64854_pp_intr() does this part.
*
* len -= size;
*/
}
}
out:
DPRINTF(("bpp done %x\n", error));
s = splbpp();
sc->sc_flags &= ~BPP_LOCKED;
if ((sc->sc_flags & BPP_WANT) != 0) {
sc->sc_flags &= ~BPP_WANT;
wakeup(sc->sc_buf);
}
splx(s);
return error;
}
