Begin separating out the TX DMA setup in preparation for TX EDMA support.

* Introduce TX DMA setup/teardown methods, mirroring what's done in
  the RX path.

  Although the TX DMA descriptor is setup via ath_desc_alloc() /
  ath_desc_free(), there TX status descriptor ring will be allocated
  in this path.

* Remove some of the TX EDMA capability probing from the RX path and
  push it into the new TX EDMA path.

1 files changed, 162 insertions, 0 deletions

diff --git a/sys/dev/ath/if_ath_tx_edma.c b/sys/dev/ath/if_ath_tx_edma.c
new file mode 100644
index 0000000..c5db404
--- /dev/null
+++ b/sys/dev/ath/if_ath_tx_edma.c
@@ -0,0 +1,162 @@
+/*-
+ * Copyright (c) 2012 Adrian Chadd <adrian@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
+ *    redistribution must be conditioned upon including a substantially
+ *    similar Disclaimer requirement for further binary redistribution.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+ * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Driver for the Atheros Wireless LAN controller.
+ *
+ * This software is derived from work of Atsushi Onoe; his contribution
+ * is greatly appreciated.
+ */
+
+#include "opt_inet.h"
+#include "opt_ath.h"
+/*
+ * This is needed for register operations which are performed
+ * by the driver - eg, calls to ath_hal_gettsf32().
+ *
+ * It's also required for any AH_DEBUG checks in here, eg the
+ * module dependencies.
+ */
+#include "opt_ah.h"
+#include "opt_wlan.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sysctl.h>
+#include <sys/mbuf.h>
+#include <sys/malloc.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/kernel.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/errno.h>
+#include <sys/callout.h>
+#include <sys/bus.h>
+#include <sys/endian.h>
+#include <sys/kthread.h>
+#include <sys/taskqueue.h>
+#include <sys/priv.h>
+#include <sys/module.h>
+#include <sys/ktr.h>
+#include <sys/smp.h>	/* for mp_ncpus */
+
+#include <machine/bus.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#include <net/if_types.h>
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+#include <net/if_llc.h>
+
+#include <net80211/ieee80211_var.h>
+#include <net80211/ieee80211_regdomain.h>
+#ifdef IEEE80211_SUPPORT_SUPERG
+#include <net80211/ieee80211_superg.h>
+#endif
+#ifdef IEEE80211_SUPPORT_TDMA
+#include <net80211/ieee80211_tdma.h>
+#endif
+
+#include <net/bpf.h>
+
+#ifdef INET
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+#endif
+
+#include <dev/ath/if_athvar.h>
+#include <dev/ath/ath_hal/ah_devid.h>		/* XXX for softled */
+#include <dev/ath/ath_hal/ah_diagcodes.h>
+
+#include <dev/ath/if_ath_debug.h>
+#include <dev/ath/if_ath_misc.h>
+#include <dev/ath/if_ath_tsf.h>
+#include <dev/ath/if_ath_tx.h>
+#include <dev/ath/if_ath_sysctl.h>
+#include <dev/ath/if_ath_led.h>
+#include <dev/ath/if_ath_keycache.h>
+#include <dev/ath/if_ath_rx.h>
+#include <dev/ath/if_ath_beacon.h>
+#include <dev/ath/if_athdfs.h>
+
+#ifdef ATH_TX99_DIAG
+#include <dev/ath/ath_tx99/ath_tx99.h>
+#endif
+
+#include <dev/ath/if_ath_tx_edma.h>
+
+/*
+ * some general macros
+  */
+#define	INCR(_l, _sz)		(_l) ++; (_l) &= ((_sz) - 1)
+#define	DECR(_l, _sz)		(_l) --; (_l) &= ((_sz) - 1)
+
+MALLOC_DECLARE(M_ATHDEV);
+
+static int
+ath_edma_dma_txsetup(struct ath_softc *sc)
+{
+
+	/* XXX placeholder */
+	return (0);
+}
+
+static int
+ath_edma_dma_txteardown(struct ath_softc *sc)
+{
+
+	/* XXX placeholder */
+	return (0);
+}
+
+void
+ath_xmit_setup_edma(struct ath_softc *sc)
+{
+
+	/* Fetch EDMA field and buffer sizes */
+	(void) ath_hal_gettxdesclen(sc->sc_ah, &sc->sc_tx_desclen);
+	(void) ath_hal_gettxstatuslen(sc->sc_ah, &sc->sc_tx_statuslen);
+	(void) ath_hal_getntxmaps(sc->sc_ah, &sc->sc_tx_nmaps);
+
+	device_printf(sc->sc_dev, "TX descriptor length: %d\n",
+	    sc->sc_tx_desclen);
+	device_printf(sc->sc_dev, "TX status length: %d\n",
+	    sc->sc_tx_statuslen);
+	device_printf(sc->sc_dev, "TX buffers per descriptor: %d\n",
+	    sc->sc_tx_nmaps);
+
+	sc->sc_tx.xmit_setup = ath_edma_dma_txsetup;
+	sc->sc_tx.xmit_teardown = ath_edma_dma_txteardown;
+}