Allocate a descriptor ring for EDMA TX completion status.

Configure the hardware with said ring physical address and size.

sys/dev/ath/if_ath_tx_edma.c

@@ -119,17 +119,33 @@ __FBSDID("$FreeBSD$");
 
 /*
  * some general macros
-  */
+ */
 #define	INCR(_l, _sz)		(_l) ++; (_l) &= ((_sz) - 1)
 #define	DECR(_l, _sz)		(_l) --; (_l) &= ((_sz) - 1)
 
+/*
+ * XXX doesn't belong here, and should be tunable
+ */
+#define	ATH_TXSTATUS_RING_SIZE	512
+
 MALLOC_DECLARE(M_ATHDEV);
 
 static int
 ath_edma_dma_txsetup(struct ath_softc *sc)
 {
+	int error;
+
+	error = ath_descdma_alloc_desc(sc, &sc->sc_txsdma,
+	    NULL, "txcomp", sc->sc_tx_statuslen, ATH_TXSTATUS_RING_SIZE);
+	if (error != 0)
+		return (error);
+
+	ath_hal_setuptxstatusring(sc->sc_ah,
+	    (void *) sc->sc_txsdma.dd_desc,
+	    sc->sc_txsdma.dd_desc_paddr,
+	    ATH_TXSTATUS_RING_SIZE);
+
 
-	/* XXX placeholder */
 	return (0);
 }
 
@@ -137,7 +153,7 @@ static int
 ath_edma_dma_txteardown(struct ath_softc *sc)
 {
 
-	/* XXX placeholder */
+	ath_descdma_cleanup(sc, &sc->sc_txsdma, NULL);
 	return (0);
 }
 

sys/dev/ath/if_athvar.h

@@ -557,6 +557,7 @@ struct ath_softc {
 	int			sc_txbuf_cnt;	/* how many buffers avail */
 	struct ath_descdma	sc_txdma_mgmt;	/* mgmt TX descriptors */
 	ath_bufhead		sc_txbuf_mgmt;	/* mgmt transmit buffer */
+	struct ath_descdma	sc_txsdma;	/* EDMA TX status desc's */
 	struct mtx		sc_txbuflock;	/* txbuf lock */
 	char			sc_txname[12];	/* e.g. "ath0_buf" */
 	u_int			sc_txqsetup;	/* h/w queues setup */