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freebsd-dev/sys/dev/ath/if_ath_tx_edma.c

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/*-
* 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)
/*
* XXX doesn't belong here, and should be tunable
*/
#define ATH_TXSTATUS_RING_SIZE 512
MALLOC_DECLARE(M_ATHDEV);
/*
* Re-initialise the DMA FIFO with the current contents of
* said FIFO.
*
* This should only be called as part of the chip reset path, as it
* assumes the FIFO is currently empty.
*
* TODO: verify that a cold/warm reset does clear the TX FIFO, so
* writing in a partially-filled FIFO will not cause double-entries
* to appear.
*/
static void
ath_edma_dma_restart(struct ath_softc *sc, struct ath_txq *txq)
{
device_printf(sc->sc_dev, "%s: called: txq=%p, qnum=%d\n",
__func__,
txq,
txq->axq_qnum);
}
/*
* Handoff this frame to the hardware.
*
* For the multicast queue, this will treat it as a software queue
* and append it to the list, after updating the MORE_DATA flag
* in the previous frame. The cabq processing code will ensure
* that the queue contents gets transferred over.
*
* For the hardware queues, this will queue a frame to the queue
* like before, then populate the FIFO from that. Since the
* EDMA hardware has 8 FIFO slots per TXQ, this ensures that
* frames such as management frames don't get prematurely dropped.
*
* This does imply that a similar flush-hwq-to-fifoq method will
* need to be called from the processq function, before the
* per-node software scheduler is called.
*/
static void
ath_edma_xmit_handoff(struct ath_softc *sc, struct ath_txq *txq,
struct ath_buf *bf)
{
device_printf(sc->sc_dev, "%s: called; bf=%p, txq=%p, qnum=%d\n",
__func__,
bf,
txq,
txq->axq_qnum);
/*
* XXX For now this is a placeholder; free the buffer
* and inform the stack that the TX failed.
*/
ath_tx_default_comp(sc, bf, 1);
}
static int
ath_edma_setup_txfifo(struct ath_softc *sc, int qnum)
{
struct ath_tx_edma_fifo *te = &sc->sc_txedma[qnum];
te->m_fifo = malloc(sizeof(struct ath_buf *) * HAL_TXFIFO_DEPTH,
M_ATHDEV,
M_NOWAIT | M_ZERO);
if (te->m_fifo == NULL) {
device_printf(sc->sc_dev, "%s: malloc failed\n",
__func__);
return (-ENOMEM);
}
/*
* Set initial "empty" state.
*/
te->m_fifo_head = te->m_fifo_tail = te->m_fifo_depth = 0;
return (0);
}
static int
ath_edma_free_txfifo(struct ath_softc *sc, int qnum)
{
struct ath_tx_edma_fifo *te = &sc->sc_txedma[qnum];
/* XXX TODO: actually deref the ath_buf entries? */
free(te->m_fifo, M_ATHDEV);
return (0);
}
static int
ath_edma_dma_txsetup(struct ath_softc *sc)
{
int error;
int i;
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);
for (i = 0; i < HAL_NUM_TX_QUEUES; i++) {
ath_edma_setup_txfifo(sc, i);
}
return (0);
}
static int
ath_edma_dma_txteardown(struct ath_softc *sc)
{
int i;
for (i = 0; i < HAL_NUM_TX_QUEUES; i++) {
ath_edma_free_txfifo(sc, i);
}
ath_descdma_cleanup(sc, &sc->sc_txsdma, NULL);
return (0);
}
static int
ath_edma_tx_processq(struct ath_softc *sc, struct ath_txq *txq, int dosched)
{
return (0);
}
static void
ath_edma_tx_draintxq(struct ath_softc *sc, struct ath_txq *txq)
{
}
static void
ath_edma_tx_proc(void *arg, int npending)
{
struct ath_softc *sc = (struct ath_softc *) arg;
device_printf(sc->sc_dev, "%s: called, npending=%d\n",
__func__, npending);
}
static void
ath_edma_attach_comp_func(struct ath_softc *sc)
{
TASK_INIT(&sc->sc_txtask, 0, ath_edma_tx_proc, sc);
}
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;
sc->sc_tx.xmit_attach_comp_func = ath_edma_attach_comp_func;
sc->sc_tx.xmit_dma_restart = ath_edma_dma_restart;
sc->sc_tx.xmit_handoff = ath_edma_xmit_handoff;
sc->sc_tx.xmit_processq = ath_edma_tx_processq;
sc->sc_tx.xmit_drainq = ath_edma_tx_draintxq;
}
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