/*
* allocate an SCQ
*/
struct patm_scd *
patm_scd_alloc(struct patm_softc *sc)
{
u_int sram, next; /* SRAM address of this and next SCD */
int error;
void *p;
struct patm_scd *scd;
bus_dmamap_t map;
bus_addr_t phy;
/* get an SCD from the free list */
if ((sram = sc->scd_free) == 0)
return (NULL);
next = patm_sram_read(sc, sram);
/* allocate memory for the queue and our host stuff */
error = bus_dmamem_alloc(sc->scd_tag, &p, BUS_DMA_NOWAIT, &map);
if (error != 0)
return (NULL);
phy = 0x3ff;
error = bus_dmamap_load(sc->scd_tag, map, p, sizeof(scd->scq),
patm_load_callback, &phy, BUS_DMA_NOWAIT);
if (error != 0) {
bus_dmamem_free(sc->scd_tag, p, map);
return (NULL);
}
KASSERT((phy & 0x1ff) == 0, ("SCD not aligned %lx", (u_long)phy));
scd = p;
bzero(scd, sizeof(*scd));
scd->sram = sram;
scd->phy = phy;
scd->map = map;
scd->space = IDT_SCQ_SIZE;
scd->last_tag = IDT_TSQE_TAG_SPACE - 1;
scd->q.ifq_maxlen = PATM_TX_IFQLEN;
/* remove the scd from the free list */
sc->scd_free = next;
LIST_INSERT_HEAD(&sc->scd_list, scd, link);
return (scd);
}
static __inline u_int
rct_read(struct patm_softc *sc, u_int cid, u_int w)
{
return (patm_sram_read(sc, sc->mmap->rct +
cid * IDT_RCT_ENTRY_SIZE + w));
}
