/*-
 * Copyright (c) 2005, 2006
 *      Damien Bergamini <damien.bergamini@free.fr>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/cdefs.h>
/*-
 * Ralink Technology RT2560 chipset driver
 * http://www.ralinktech.com/
 */

#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/endian.h>

#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>

#include <net/bpf.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>

#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_radiotap.h>
#include <net80211/ieee80211_regdomain.h>
#include <net80211/ieee80211_ratectl.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>

#include <dev/ral/rt2560reg.h>
#include <dev/ral/rt2560var.h>

#define RT2560_RSSI(sc, rssi)                                   \
        ((rssi) > (RT2560_NOISE_FLOOR + (sc)->rssi_corr) ?      \
         ((rssi) - RT2560_NOISE_FLOOR - (sc)->rssi_corr) : 0)

#define RAL_DEBUG
#ifdef RAL_DEBUG
#define DPRINTF(sc, fmt, ...) do {                              \
        if (sc->sc_debug > 0)                                   \
                printf(fmt, __VA_ARGS__);                       \
} while (0)
#define DPRINTFN(sc, n, fmt, ...) do {                          \
        if (sc->sc_debug >= (n))                                \
                printf(fmt, __VA_ARGS__);                       \
} while (0)
#else
#define DPRINTF(sc, fmt, ...)
#define DPRINTFN(sc, n, fmt, ...)
#endif

static struct ieee80211vap *rt2560_vap_create(struct ieee80211com *,
                            const char [IFNAMSIZ], int, enum ieee80211_opmode,
                            int, const uint8_t [IEEE80211_ADDR_LEN],
                            const uint8_t [IEEE80211_ADDR_LEN]);
static void             rt2560_vap_delete(struct ieee80211vap *);
static void             rt2560_dma_map_addr(void *, bus_dma_segment_t *, int,
                            int);
static int              rt2560_alloc_tx_ring(struct rt2560_softc *,
                            struct rt2560_tx_ring *, int);
static void             rt2560_reset_tx_ring(struct rt2560_softc *,
                            struct rt2560_tx_ring *);
static void             rt2560_free_tx_ring(struct rt2560_softc *,
                            struct rt2560_tx_ring *);
static int              rt2560_alloc_rx_ring(struct rt2560_softc *,
                            struct rt2560_rx_ring *, int);
static void             rt2560_reset_rx_ring(struct rt2560_softc *,
                            struct rt2560_rx_ring *);
static void             rt2560_free_rx_ring(struct rt2560_softc *,
                            struct rt2560_rx_ring *);
static int              rt2560_newstate(struct ieee80211vap *,
                            enum ieee80211_state, int);
static uint16_t         rt2560_eeprom_read(struct rt2560_softc *, uint8_t);
static void             rt2560_encryption_intr(struct rt2560_softc *);
static void             rt2560_tx_intr(struct rt2560_softc *);
static void             rt2560_prio_intr(struct rt2560_softc *);
static void             rt2560_decryption_intr(struct rt2560_softc *);
static void             rt2560_rx_intr(struct rt2560_softc *);
static void             rt2560_beacon_update(struct ieee80211vap *, int item);
static void             rt2560_beacon_expire(struct rt2560_softc *);
static void             rt2560_wakeup_expire(struct rt2560_softc *);
static void             rt2560_scan_start(struct ieee80211com *);
static void             rt2560_scan_end(struct ieee80211com *);
static void             rt2560_getradiocaps(struct ieee80211com *, int, int *,
                            struct ieee80211_channel[]);
static void             rt2560_set_channel(struct ieee80211com *);
static void             rt2560_setup_tx_desc(struct rt2560_softc *,
                            struct rt2560_tx_desc *, uint32_t, int, int, int,
                            bus_addr_t);
static int              rt2560_tx_bcn(struct rt2560_softc *, struct mbuf *,
                            struct ieee80211_node *);
static int              rt2560_tx_mgt(struct rt2560_softc *, struct mbuf *,
                            struct ieee80211_node *);
static int              rt2560_tx_data(struct rt2560_softc *, struct mbuf *,
                            struct ieee80211_node *);
static int              rt2560_transmit(struct ieee80211com *, struct mbuf *);
static void             rt2560_start(struct rt2560_softc *);
static void             rt2560_watchdog(void *);
static void             rt2560_parent(struct ieee80211com *);
static void             rt2560_bbp_write(struct rt2560_softc *, uint8_t,
                            uint8_t);
static uint8_t          rt2560_bbp_read(struct rt2560_softc *, uint8_t);
static void             rt2560_rf_write(struct rt2560_softc *, uint8_t,
                            uint32_t);
static void             rt2560_set_chan(struct rt2560_softc *,
                            struct ieee80211_channel *);
#if 0
static void             rt2560_disable_rf_tune(struct rt2560_softc *);
#endif
static void             rt2560_enable_tsf_sync(struct rt2560_softc *);
static void             rt2560_enable_tsf(struct rt2560_softc *);
static void             rt2560_update_plcp(struct rt2560_softc *);
static void             rt2560_update_slot(struct ieee80211com *);
static void             rt2560_set_basicrates(struct rt2560_softc *,
                            const struct ieee80211_rateset *);
static void             rt2560_update_led(struct rt2560_softc *, int, int);
static void             rt2560_set_bssid(struct rt2560_softc *, const uint8_t *);
static void             rt2560_set_macaddr(struct rt2560_softc *,
                            const uint8_t *);
static void             rt2560_get_macaddr(struct rt2560_softc *, uint8_t *);
static void             rt2560_update_promisc(struct ieee80211com *);
static const char       *rt2560_get_rf(int);
static void             rt2560_read_config(struct rt2560_softc *);
static int              rt2560_bbp_init(struct rt2560_softc *);
static void             rt2560_set_txantenna(struct rt2560_softc *, int);
static void             rt2560_set_rxantenna(struct rt2560_softc *, int);
static void             rt2560_init_locked(struct rt2560_softc *);
static void             rt2560_init(void *);
static void             rt2560_stop_locked(struct rt2560_softc *);
static int              rt2560_raw_xmit(struct ieee80211_node *, struct mbuf *,
                                const struct ieee80211_bpf_params *);

static const struct {
        uint32_t        reg;
        uint32_t        val;
} rt2560_def_mac[] = {
        RT2560_DEF_MAC
};

static const struct {
        uint8_t reg;
        uint8_t val;
} rt2560_def_bbp[] = {
        RT2560_DEF_BBP
};

static const uint32_t rt2560_rf2522_r2[]    = RT2560_RF2522_R2;
static const uint32_t rt2560_rf2523_r2[]    = RT2560_RF2523_R2;
static const uint32_t rt2560_rf2524_r2[]    = RT2560_RF2524_R2;
static const uint32_t rt2560_rf2525_r2[]    = RT2560_RF2525_R2;
static const uint32_t rt2560_rf2525_hi_r2[] = RT2560_RF2525_HI_R2;
static const uint32_t rt2560_rf2525e_r2[]   = RT2560_RF2525E_R2;
static const uint32_t rt2560_rf2526_r2[]    = RT2560_RF2526_R2;
static const uint32_t rt2560_rf2526_hi_r2[] = RT2560_RF2526_HI_R2;

static const uint8_t rt2560_chan_5ghz[] =
        { 36, 40, 44, 48, 52, 56, 60, 64,
          100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140,
          149, 153, 157, 161 };

static const struct {
        uint8_t         chan;
        uint32_t        r1, r2, r4;
} rt2560_rf5222[] = {
        RT2560_RF5222
};

int
rt2560_attach(device_t dev, int id)
{
        struct rt2560_softc *sc = device_get_softc(dev);
        struct ieee80211com *ic = &sc->sc_ic;
        int error;

        sc->sc_dev = dev;

        mtx_init(&sc->sc_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
            MTX_DEF | MTX_RECURSE);

        callout_init_mtx(&sc->watchdog_ch, &sc->sc_mtx, 0);
        mbufq_init(&sc->sc_snd, ifqmaxlen);

        /* retrieve RT2560 rev. no */
        sc->asic_rev = RAL_READ(sc, RT2560_CSR0);

        /* retrieve RF rev. no and various other things from EEPROM */
        rt2560_read_config(sc);

        device_printf(dev, "MAC/BBP RT2560 (rev 0x%02x), RF %s\n",
            sc->asic_rev, rt2560_get_rf(sc->rf_rev));

        /*
         * Allocate Tx and Rx rings.
         */
        error = rt2560_alloc_tx_ring(sc, &sc->txq, RT2560_TX_RING_COUNT);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not allocate Tx ring\n");
                goto fail1;
        }

        error = rt2560_alloc_tx_ring(sc, &sc->atimq, RT2560_ATIM_RING_COUNT);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not allocate ATIM ring\n");
                goto fail2;
        }

        error = rt2560_alloc_tx_ring(sc, &sc->prioq, RT2560_PRIO_RING_COUNT);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not allocate Prio ring\n");
                goto fail3;
        }

        error = rt2560_alloc_tx_ring(sc, &sc->bcnq, RT2560_BEACON_RING_COUNT);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not allocate Beacon ring\n");
                goto fail4;
        }

        error = rt2560_alloc_rx_ring(sc, &sc->rxq, RT2560_RX_RING_COUNT);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not allocate Rx ring\n");
                goto fail5;
        }

        /* retrieve MAC address */
        rt2560_get_macaddr(sc, ic->ic_macaddr);

        ic->ic_softc = sc;
        ic->ic_name = device_get_nameunit(dev);
        ic->ic_opmode = IEEE80211_M_STA;
        ic->ic_phytype = IEEE80211_T_OFDM; /* not only, but not used */

        /* set device capabilities */
        ic->ic_caps =
                  IEEE80211_C_STA               /* station mode */
                | IEEE80211_C_IBSS              /* ibss, nee adhoc, mode */
                | IEEE80211_C_HOSTAP            /* hostap mode */
                | IEEE80211_C_MONITOR           /* monitor mode */
                | IEEE80211_C_AHDEMO            /* adhoc demo mode */
                | IEEE80211_C_WDS               /* 4-address traffic works */
                | IEEE80211_C_MBSS              /* mesh point link mode */
                | IEEE80211_C_SHPREAMBLE        /* short preamble supported */
                | IEEE80211_C_SHSLOT            /* short slot time supported */
                | IEEE80211_C_WPA               /* capable of WPA1+WPA2 */
                | IEEE80211_C_BGSCAN            /* capable of bg scanning */
#ifdef notyet
                | IEEE80211_C_TXFRAG            /* handle tx frags */
#endif
                ;

        ic->ic_flags_ext |= IEEE80211_FEXT_SEQNO_OFFLOAD;

        rt2560_getradiocaps(ic, IEEE80211_CHAN_MAX, &ic->ic_nchans,
            ic->ic_channels);

        ieee80211_ifattach(ic);
        ic->ic_raw_xmit = rt2560_raw_xmit;
        ic->ic_updateslot = rt2560_update_slot;
        ic->ic_update_promisc = rt2560_update_promisc;
        ic->ic_scan_start = rt2560_scan_start;
        ic->ic_scan_end = rt2560_scan_end;
        ic->ic_getradiocaps = rt2560_getradiocaps;
        ic->ic_set_channel = rt2560_set_channel;

        ic->ic_vap_create = rt2560_vap_create;
        ic->ic_vap_delete = rt2560_vap_delete;
        ic->ic_parent = rt2560_parent;
        ic->ic_transmit = rt2560_transmit;

        ieee80211_radiotap_attach(ic,
            &sc->sc_txtap.wt_ihdr, sizeof(sc->sc_txtap),
                RT2560_TX_RADIOTAP_PRESENT,
            &sc->sc_rxtap.wr_ihdr, sizeof(sc->sc_rxtap),
                RT2560_RX_RADIOTAP_PRESENT);

        /*
         * Add a few sysctl knobs.
         */
#ifdef RAL_DEBUG
        SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
            SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
            "debug", CTLFLAG_RW, &sc->sc_debug, 0, "debug msgs");
#endif
        SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
            SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
            "txantenna", CTLFLAG_RW, &sc->tx_ant, 0, "tx antenna (0=auto)");

        SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
            SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
            "rxantenna", CTLFLAG_RW, &sc->rx_ant, 0, "rx antenna (0=auto)");

        if (bootverbose)
                ieee80211_announce(ic);

        return 0;

fail5:  rt2560_free_tx_ring(sc, &sc->bcnq);
fail4:  rt2560_free_tx_ring(sc, &sc->prioq);
fail3:  rt2560_free_tx_ring(sc, &sc->atimq);
fail2:  rt2560_free_tx_ring(sc, &sc->txq);
fail1:  mtx_destroy(&sc->sc_mtx);

        return ENXIO;
}

int
rt2560_detach(void *xsc)
{
        struct rt2560_softc *sc = xsc;
        struct ieee80211com *ic = &sc->sc_ic;

        rt2560_stop(sc);

        ieee80211_ifdetach(ic);
        mbufq_drain(&sc->sc_snd);

        rt2560_free_tx_ring(sc, &sc->txq);
        rt2560_free_tx_ring(sc, &sc->atimq);
        rt2560_free_tx_ring(sc, &sc->prioq);
        rt2560_free_tx_ring(sc, &sc->bcnq);
        rt2560_free_rx_ring(sc, &sc->rxq);

        mtx_destroy(&sc->sc_mtx);

        return 0;
}

static struct ieee80211vap *
rt2560_vap_create(struct ieee80211com *ic, const char name[IFNAMSIZ], int unit,
    enum ieee80211_opmode opmode, int flags,
    const uint8_t bssid[IEEE80211_ADDR_LEN],
    const uint8_t mac[IEEE80211_ADDR_LEN])
{
        struct rt2560_softc *sc = ic->ic_softc;
        struct rt2560_vap *rvp;
        struct ieee80211vap *vap;

        switch (opmode) {
        case IEEE80211_M_STA:
        case IEEE80211_M_IBSS:
        case IEEE80211_M_AHDEMO:
        case IEEE80211_M_MONITOR:
        case IEEE80211_M_HOSTAP:
        case IEEE80211_M_MBSS:
                /* XXXRP: TBD */
                if (!TAILQ_EMPTY(&ic->ic_vaps)) {
                        device_printf(sc->sc_dev, "only 1 vap supported\n");
                        return NULL;
                }
                if (opmode == IEEE80211_M_STA)
                        flags |= IEEE80211_CLONE_NOBEACONS;
                break;
        case IEEE80211_M_WDS:
                if (TAILQ_EMPTY(&ic->ic_vaps) ||
                    ic->ic_opmode != IEEE80211_M_HOSTAP) {
                        device_printf(sc->sc_dev,
                            "wds only supported in ap mode\n");
                        return NULL;
                }
                /*
                 * Silently remove any request for a unique
                 * bssid; WDS vap's always share the local
                 * mac address.
                 */
                flags &= ~IEEE80211_CLONE_BSSID;
                break;
        default:
                device_printf(sc->sc_dev, "unknown opmode %d\n", opmode);
                return NULL;
        }
        rvp = malloc(sizeof(struct rt2560_vap), M_80211_VAP, M_WAITOK | M_ZERO);
        vap = &rvp->ral_vap;
        ieee80211_vap_setup(ic, vap, name, unit, opmode, flags, bssid);

        /* override state transition machine */
        rvp->ral_newstate = vap->iv_newstate;
        vap->iv_newstate = rt2560_newstate;
        vap->iv_update_beacon = rt2560_beacon_update;

        ieee80211_ratectl_init(vap);
        /* complete setup */
        ieee80211_vap_attach(vap, ieee80211_media_change,
            ieee80211_media_status, mac);
        if (TAILQ_FIRST(&ic->ic_vaps) == vap)
                ic->ic_opmode = opmode;
        return vap;
}

static void
rt2560_vap_delete(struct ieee80211vap *vap)
{
        struct rt2560_vap *rvp = RT2560_VAP(vap);

        ieee80211_ratectl_deinit(vap);
        ieee80211_vap_detach(vap);
        free(rvp, M_80211_VAP);
}

void
rt2560_resume(void *xsc)
{
        struct rt2560_softc *sc = xsc;

        if (sc->sc_ic.ic_nrunning > 0)
                rt2560_init(sc);
}

static void
rt2560_dma_map_addr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
        if (error != 0)
                return;

        KASSERT(nseg == 1, ("too many DMA segments, %d should be 1", nseg));

        *(bus_addr_t *)arg = segs[0].ds_addr;
}

static int
rt2560_alloc_tx_ring(struct rt2560_softc *sc, struct rt2560_tx_ring *ring,
    int count)
{
        int i, error;

        ring->count = count;
        ring->queued = 0;
        ring->cur = ring->next = 0;
        ring->cur_encrypt = ring->next_encrypt = 0;

        error = bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev), 4, 0, 
            BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
            count * RT2560_TX_DESC_SIZE, 1, count * RT2560_TX_DESC_SIZE,
            0, NULL, NULL, &ring->desc_dmat);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not create desc DMA tag\n");
                goto fail;
        }

        error = bus_dmamem_alloc(ring->desc_dmat, (void **)&ring->desc,
            BUS_DMA_NOWAIT | BUS_DMA_ZERO, &ring->desc_map);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not allocate DMA memory\n");
                goto fail;
        }

        error = bus_dmamap_load(ring->desc_dmat, ring->desc_map, ring->desc,
            count * RT2560_TX_DESC_SIZE, rt2560_dma_map_addr, &ring->physaddr,
            0);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not load desc DMA map\n");
                goto fail;
        }

        ring->data = malloc(count * sizeof (struct rt2560_tx_data), M_DEVBUF,
            M_NOWAIT | M_ZERO);
        if (ring->data == NULL) {
                device_printf(sc->sc_dev, "could not allocate soft data\n");
                error = ENOMEM;
                goto fail;
        }

        error = bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev), 1, 0, 
            BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
            MCLBYTES, RT2560_MAX_SCATTER, MCLBYTES, 0, NULL, NULL,
            &ring->data_dmat);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not create data DMA tag\n");
                goto fail;
        }

        for (i = 0; i < count; i++) {
                error = bus_dmamap_create(ring->data_dmat, 0,
                    &ring->data[i].map);
                if (error != 0) {
                        device_printf(sc->sc_dev, "could not create DMA map\n");
                        goto fail;
                }
        }

        return 0;

fail:   rt2560_free_tx_ring(sc, ring);
        return error;
}

static void
rt2560_reset_tx_ring(struct rt2560_softc *sc, struct rt2560_tx_ring *ring)
{
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        int i;

        for (i = 0; i < ring->count; i++) {
                desc = &ring->desc[i];
                data = &ring->data[i];

                if (data->m != NULL) {
                        bus_dmamap_sync(ring->data_dmat, data->map,
                            BUS_DMASYNC_POSTWRITE);
                        bus_dmamap_unload(ring->data_dmat, data->map);
                        m_freem(data->m);
                        data->m = NULL;
                }

                if (data->ni != NULL) {
                        ieee80211_free_node(data->ni);
                        data->ni = NULL;
                }

                desc->flags = 0;
        }

        bus_dmamap_sync(ring->desc_dmat, ring->desc_map, BUS_DMASYNC_PREWRITE);

        ring->queued = 0;
        ring->cur = ring->next = 0;
        ring->cur_encrypt = ring->next_encrypt = 0;
}

static void
rt2560_free_tx_ring(struct rt2560_softc *sc, struct rt2560_tx_ring *ring)
{
        struct rt2560_tx_data *data;
        int i;

        if (ring->desc != NULL) {
                bus_dmamap_sync(ring->desc_dmat, ring->desc_map,
                    BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(ring->desc_dmat, ring->desc_map);
                bus_dmamem_free(ring->desc_dmat, ring->desc, ring->desc_map);
        }

        if (ring->desc_dmat != NULL)
                bus_dma_tag_destroy(ring->desc_dmat);

        if (ring->data != NULL) {
                for (i = 0; i < ring->count; i++) {
                        data = &ring->data[i];

                        if (data->m != NULL) {
                                bus_dmamap_sync(ring->data_dmat, data->map,
                                    BUS_DMASYNC_POSTWRITE);
                                bus_dmamap_unload(ring->data_dmat, data->map);
                                m_freem(data->m);
                        }

                        if (data->ni != NULL)
                                ieee80211_free_node(data->ni);

                        if (data->map != NULL)
                                bus_dmamap_destroy(ring->data_dmat, data->map);
                }

                free(ring->data, M_DEVBUF);
        }

        if (ring->data_dmat != NULL)
                bus_dma_tag_destroy(ring->data_dmat);
}

static int
rt2560_alloc_rx_ring(struct rt2560_softc *sc, struct rt2560_rx_ring *ring,
    int count)
{
        struct rt2560_rx_desc *desc;
        struct rt2560_rx_data *data;
        bus_addr_t physaddr;
        int i, error;

        ring->count = count;
        ring->cur = ring->next = 0;
        ring->cur_decrypt = 0;

        error = bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev), 4, 0, 
            BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
            count * RT2560_RX_DESC_SIZE, 1, count * RT2560_RX_DESC_SIZE,
            0, NULL, NULL, &ring->desc_dmat);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not create desc DMA tag\n");
                goto fail;
        }

        error = bus_dmamem_alloc(ring->desc_dmat, (void **)&ring->desc,
            BUS_DMA_NOWAIT | BUS_DMA_ZERO, &ring->desc_map);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not allocate DMA memory\n");
                goto fail;
        }

        error = bus_dmamap_load(ring->desc_dmat, ring->desc_map, ring->desc,
            count * RT2560_RX_DESC_SIZE, rt2560_dma_map_addr, &ring->physaddr,
            0);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not load desc DMA map\n");
                goto fail;
        }

        ring->data = malloc(count * sizeof (struct rt2560_rx_data), M_DEVBUF,
            M_NOWAIT | M_ZERO);
        if (ring->data == NULL) {
                device_printf(sc->sc_dev, "could not allocate soft data\n");
                error = ENOMEM;
                goto fail;
        }

        /*
         * Pre-allocate Rx buffers and populate Rx ring.
         */
        error = bus_dma_tag_create(bus_get_dma_tag(sc->sc_dev), 1, 0, 
            BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL, MCLBYTES,
            1, MCLBYTES, 0, NULL, NULL, &ring->data_dmat);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not create data DMA tag\n");
                goto fail;
        }

        for (i = 0; i < count; i++) {
                desc = &sc->rxq.desc[i];
                data = &sc->rxq.data[i];

                error = bus_dmamap_create(ring->data_dmat, 0, &data->map);
                if (error != 0) {
                        device_printf(sc->sc_dev, "could not create DMA map\n");
                        goto fail;
                }

                data->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
                if (data->m == NULL) {
                        device_printf(sc->sc_dev,
                            "could not allocate rx mbuf\n");
                        error = ENOMEM;
                        goto fail;
                }

                error = bus_dmamap_load(ring->data_dmat, data->map,
                    mtod(data->m, void *), MCLBYTES, rt2560_dma_map_addr,
                    &physaddr, 0);
                if (error != 0) {
                        device_printf(sc->sc_dev,
                            "could not load rx buf DMA map");
                        goto fail;
                }

                desc->flags = htole32(RT2560_RX_BUSY);
                desc->physaddr = htole32(physaddr);
        }

        bus_dmamap_sync(ring->desc_dmat, ring->desc_map, BUS_DMASYNC_PREWRITE);

        return 0;

fail:   rt2560_free_rx_ring(sc, ring);
        return error;
}

static void
rt2560_reset_rx_ring(struct rt2560_softc *sc, struct rt2560_rx_ring *ring)
{
        int i;

        for (i = 0; i < ring->count; i++) {
                ring->desc[i].flags = htole32(RT2560_RX_BUSY);
                ring->data[i].drop = 0;
        }

        bus_dmamap_sync(ring->desc_dmat, ring->desc_map, BUS_DMASYNC_PREWRITE);

        ring->cur = ring->next = 0;
        ring->cur_decrypt = 0;
}

static void
rt2560_free_rx_ring(struct rt2560_softc *sc, struct rt2560_rx_ring *ring)
{
        struct rt2560_rx_data *data;
        int i;

        if (ring->desc != NULL) {
                bus_dmamap_sync(ring->desc_dmat, ring->desc_map,
                    BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(ring->desc_dmat, ring->desc_map);
                bus_dmamem_free(ring->desc_dmat, ring->desc, ring->desc_map);
        }

        if (ring->desc_dmat != NULL)
                bus_dma_tag_destroy(ring->desc_dmat);

        if (ring->data != NULL) {
                for (i = 0; i < ring->count; i++) {
                        data = &ring->data[i];

                        if (data->m != NULL) {
                                bus_dmamap_sync(ring->data_dmat, data->map,
                                    BUS_DMASYNC_POSTREAD);
                                bus_dmamap_unload(ring->data_dmat, data->map);
                                m_freem(data->m);
                        }

                        if (data->map != NULL)
                                bus_dmamap_destroy(ring->data_dmat, data->map);
                }

                free(ring->data, M_DEVBUF);
        }

        if (ring->data_dmat != NULL)
                bus_dma_tag_destroy(ring->data_dmat);
}

static int
rt2560_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
        struct rt2560_vap *rvp = RT2560_VAP(vap);
        struct rt2560_softc *sc = vap->iv_ic->ic_softc;
        int error;

        if (nstate == IEEE80211_S_INIT && vap->iv_state == IEEE80211_S_RUN) {
                /* abort TSF synchronization */
                RAL_WRITE(sc, RT2560_CSR14, 0);

                /* turn association led off */
                rt2560_update_led(sc, 0, 0);
        }

        error = rvp->ral_newstate(vap, nstate, arg);

        if (error == 0 && nstate == IEEE80211_S_RUN) {
                struct ieee80211_node *ni = vap->iv_bss;
                struct mbuf *m;

                if (vap->iv_opmode != IEEE80211_M_MONITOR) {
                        rt2560_update_plcp(sc);
                        rt2560_set_basicrates(sc, &ni->ni_rates);
                        rt2560_set_bssid(sc, ni->ni_bssid);
                }

                if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
                    vap->iv_opmode == IEEE80211_M_IBSS ||
                    vap->iv_opmode == IEEE80211_M_MBSS) {
                        m = ieee80211_beacon_alloc(ni);
                        if (m == NULL) {
                                device_printf(sc->sc_dev,
                                    "could not allocate beacon\n");
                                return ENOBUFS;
                        }
                        ieee80211_ref_node(ni);
                        error = rt2560_tx_bcn(sc, m, ni);
                        if (error != 0)
                                return error;
                }

                /* turn association led on */
                rt2560_update_led(sc, 1, 0);

                if (vap->iv_opmode != IEEE80211_M_MONITOR)
                        rt2560_enable_tsf_sync(sc);
                else
                        rt2560_enable_tsf(sc);
        }
        return error;
}

/*
 * Read 16 bits at address 'addr' from the serial EEPROM (either 93C46 or
 * 93C66).
 */
static uint16_t
rt2560_eeprom_read(struct rt2560_softc *sc, uint8_t addr)
{
        uint32_t tmp;
        uint16_t val;
        int n;

        /* clock C once before the first command */
        RT2560_EEPROM_CTL(sc, 0);

        RT2560_EEPROM_CTL(sc, RT2560_S);
        RT2560_EEPROM_CTL(sc, RT2560_S | RT2560_C);
        RT2560_EEPROM_CTL(sc, RT2560_S);

        /* write start bit (1) */
        RT2560_EEPROM_CTL(sc, RT2560_S | RT2560_D);
        RT2560_EEPROM_CTL(sc, RT2560_S | RT2560_D | RT2560_C);

        /* write READ opcode (10) */
        RT2560_EEPROM_CTL(sc, RT2560_S | RT2560_D);
        RT2560_EEPROM_CTL(sc, RT2560_S | RT2560_D | RT2560_C);
        RT2560_EEPROM_CTL(sc, RT2560_S);
        RT2560_EEPROM_CTL(sc, RT2560_S | RT2560_C);

        /* write address (A5-A0 or A7-A0) */
        n = (RAL_READ(sc, RT2560_CSR21) & RT2560_93C46) ? 5 : 7;
        for (; n >= 0; n--) {
                RT2560_EEPROM_CTL(sc, RT2560_S |
                    (((addr >> n) & 1) << RT2560_SHIFT_D));
                RT2560_EEPROM_CTL(sc, RT2560_S |
                    (((addr >> n) & 1) << RT2560_SHIFT_D) | RT2560_C);
        }

        RT2560_EEPROM_CTL(sc, RT2560_S);

        /* read data Q15-Q0 */
        val = 0;
        for (n = 15; n >= 0; n--) {
                RT2560_EEPROM_CTL(sc, RT2560_S | RT2560_C);
                tmp = RAL_READ(sc, RT2560_CSR21);
                val |= ((tmp & RT2560_Q) >> RT2560_SHIFT_Q) << n;
                RT2560_EEPROM_CTL(sc, RT2560_S);
        }

        RT2560_EEPROM_CTL(sc, 0);

        /* clear Chip Select and clock C */
        RT2560_EEPROM_CTL(sc, RT2560_S);
        RT2560_EEPROM_CTL(sc, 0);
        RT2560_EEPROM_CTL(sc, RT2560_C);

        return val;
}

/*
 * Some frames were processed by the hardware cipher engine and are ready for
 * transmission.
 */
static void
rt2560_encryption_intr(struct rt2560_softc *sc)
{
        struct rt2560_tx_desc *desc;
        int hw;

        /* retrieve last descriptor index processed by cipher engine */
        hw = RAL_READ(sc, RT2560_SECCSR1) - sc->txq.physaddr;
        hw /= RT2560_TX_DESC_SIZE;

        bus_dmamap_sync(sc->txq.desc_dmat, sc->txq.desc_map,
            BUS_DMASYNC_POSTREAD);

        while (sc->txq.next_encrypt != hw) {
                if (sc->txq.next_encrypt == sc->txq.cur_encrypt) {
                        printf("hw encrypt %d, cur_encrypt %d\n", hw,
                            sc->txq.cur_encrypt);
                        break;
                }

                desc = &sc->txq.desc[sc->txq.next_encrypt];

                if ((le32toh(desc->flags) & RT2560_TX_BUSY) ||
                    (le32toh(desc->flags) & RT2560_TX_CIPHER_BUSY))
                        break;

                /* for TKIP, swap eiv field to fix a bug in ASIC */
                if ((le32toh(desc->flags) & RT2560_TX_CIPHER_MASK) ==
                    RT2560_TX_CIPHER_TKIP)
                        desc->eiv = bswap32(desc->eiv);

                /* mark the frame ready for transmission */
                desc->flags |= htole32(RT2560_TX_VALID);
                desc->flags |= htole32(RT2560_TX_BUSY);

                DPRINTFN(sc, 15, "encryption done idx=%u\n",
                    sc->txq.next_encrypt);

                sc->txq.next_encrypt =
                    (sc->txq.next_encrypt + 1) % RT2560_TX_RING_COUNT;
        }

        bus_dmamap_sync(sc->txq.desc_dmat, sc->txq.desc_map,
            BUS_DMASYNC_PREWRITE);

        /* kick Tx */
        RAL_WRITE(sc, RT2560_TXCSR0, RT2560_KICK_TX);
}

static void
rt2560_tx_intr(struct rt2560_softc *sc)
{
        struct ieee80211_ratectl_tx_status *txs = &sc->sc_txs;
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        struct mbuf *m;
        struct ieee80211_node *ni;
        uint32_t flags;
        int status;

        bus_dmamap_sync(sc->txq.desc_dmat, sc->txq.desc_map,
            BUS_DMASYNC_POSTREAD);

        txs->flags = IEEE80211_RATECTL_STATUS_LONG_RETRY;
        for (;;) {
                desc = &sc->txq.desc[sc->txq.next];
                data = &sc->txq.data[sc->txq.next];

                flags = le32toh(desc->flags);
                if ((flags & RT2560_TX_BUSY) ||
                    (flags & RT2560_TX_CIPHER_BUSY) ||
                    !(flags & RT2560_TX_VALID))
                        break;

                m = data->m;
                ni = data->ni;

                switch (flags & RT2560_TX_RESULT_MASK) {
                case RT2560_TX_SUCCESS:
                        txs->status = IEEE80211_RATECTL_TX_SUCCESS;
                        txs->long_retries = 0;

                        DPRINTFN(sc, 10, "%s\n", "data frame sent successfully");
                        if (data->rix != IEEE80211_FIXED_RATE_NONE)
                                ieee80211_ratectl_tx_complete(ni, txs);
                        status = 0;
                        break;

                case RT2560_TX_SUCCESS_RETRY:
                        txs->status = IEEE80211_RATECTL_TX_SUCCESS;
                        txs->long_retries = RT2560_TX_RETRYCNT(flags);

                        DPRINTFN(sc, 9, "data frame sent after %u retries\n",
                            txs->long_retries);
                        if (data->rix != IEEE80211_FIXED_RATE_NONE)
                                ieee80211_ratectl_tx_complete(ni, txs);
                        status = 0;
                        break;

                case RT2560_TX_FAIL_RETRY:
                        txs->status = IEEE80211_RATECTL_TX_FAIL_LONG;
                        txs->long_retries = RT2560_TX_RETRYCNT(flags);

                        DPRINTFN(sc, 9, "data frame failed after %d retries\n",
                            txs->long_retries);
                        if (data->rix != IEEE80211_FIXED_RATE_NONE)
                                ieee80211_ratectl_tx_complete(ni, txs);
                        status = 1;
                        break;

                case RT2560_TX_FAIL_INVALID:
                case RT2560_TX_FAIL_OTHER:
                default:
                        device_printf(sc->sc_dev, "sending data frame failed "
                            "0x%08x\n", flags);
                        status = 1;
                }

                bus_dmamap_sync(sc->txq.data_dmat, data->map,
                    BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(sc->txq.data_dmat, data->map);

                ieee80211_tx_complete(ni, m, status);
                data->ni = NULL;
                data->m = NULL;

                /* descriptor is no longer valid */
                desc->flags &= ~htole32(RT2560_TX_VALID);

                DPRINTFN(sc, 15, "tx done idx=%u\n", sc->txq.next);

                sc->txq.queued--;
                sc->txq.next = (sc->txq.next + 1) % RT2560_TX_RING_COUNT;
        }

        bus_dmamap_sync(sc->txq.desc_dmat, sc->txq.desc_map,
            BUS_DMASYNC_PREWRITE);

        if (sc->prioq.queued == 0 && sc->txq.queued == 0)
                sc->sc_tx_timer = 0;

        if (sc->txq.queued < RT2560_TX_RING_COUNT - 1)
                rt2560_start(sc);
}

static void
rt2560_prio_intr(struct rt2560_softc *sc)
{
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        struct ieee80211_node *ni;
        struct mbuf *m;
        int flags;

        bus_dmamap_sync(sc->prioq.desc_dmat, sc->prioq.desc_map,
            BUS_DMASYNC_POSTREAD);

        for (;;) {
                desc = &sc->prioq.desc[sc->prioq.next];
                data = &sc->prioq.data[sc->prioq.next];

                flags = le32toh(desc->flags);
                if ((flags & RT2560_TX_BUSY) || (flags & RT2560_TX_VALID) == 0)
                        break;

                switch (flags & RT2560_TX_RESULT_MASK) {
                case RT2560_TX_SUCCESS:
                        DPRINTFN(sc, 10, "%s\n", "mgt frame sent successfully");
                        break;

                case RT2560_TX_SUCCESS_RETRY:
                        DPRINTFN(sc, 9, "mgt frame sent after %u retries\n",
                            (flags >> 5) & 0x7);
                        break;

                case RT2560_TX_FAIL_RETRY:
                        DPRINTFN(sc, 9, "%s\n",
                            "sending mgt frame failed (too much retries)");
                        break;

                case RT2560_TX_FAIL_INVALID:
                case RT2560_TX_FAIL_OTHER:
                default:
                        device_printf(sc->sc_dev, "sending mgt frame failed "
                            "0x%08x\n", flags);
                        break;
                }

                bus_dmamap_sync(sc->prioq.data_dmat, data->map,
                    BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(sc->prioq.data_dmat, data->map);

                m = data->m;
                data->m = NULL;
                ni = data->ni;
                data->ni = NULL;

                /* descriptor is no longer valid */
                desc->flags &= ~htole32(RT2560_TX_VALID);

                DPRINTFN(sc, 15, "prio done idx=%u\n", sc->prioq.next);

                sc->prioq.queued--;
                sc->prioq.next = (sc->prioq.next + 1) % RT2560_PRIO_RING_COUNT;

                if (m->m_flags & M_TXCB)
                        ieee80211_process_callback(ni, m,
                                (flags & RT2560_TX_RESULT_MASK) &~
                                (RT2560_TX_SUCCESS | RT2560_TX_SUCCESS_RETRY));
                m_freem(m);
                ieee80211_free_node(ni);
        }

        bus_dmamap_sync(sc->prioq.desc_dmat, sc->prioq.desc_map,
            BUS_DMASYNC_PREWRITE);

        if (sc->prioq.queued == 0 && sc->txq.queued == 0)
                sc->sc_tx_timer = 0;

        if (sc->prioq.queued < RT2560_PRIO_RING_COUNT)
                rt2560_start(sc);
}

/*
 * Some frames were processed by the hardware cipher engine and are ready for
 * handoff to the IEEE802.11 layer.
 */
static void
rt2560_decryption_intr(struct rt2560_softc *sc)
{
        struct ieee80211com *ic = &sc->sc_ic;
        struct rt2560_rx_desc *desc;
        struct rt2560_rx_data *data;
        bus_addr_t physaddr;
        struct ieee80211_frame *wh;
        struct ieee80211_node *ni;
        struct mbuf *mnew, *m;
        int hw, error;
        int8_t rssi, nf;

        /* retrieve last descriptor index processed by cipher engine */
        hw = RAL_READ(sc, RT2560_SECCSR0) - sc->rxq.physaddr;
        hw /= RT2560_RX_DESC_SIZE;

        bus_dmamap_sync(sc->rxq.desc_dmat, sc->rxq.desc_map,
            BUS_DMASYNC_POSTREAD);

        for (; sc->rxq.cur_decrypt != hw;) {
                desc = &sc->rxq.desc[sc->rxq.cur_decrypt];
                data = &sc->rxq.data[sc->rxq.cur_decrypt];

                if ((le32toh(desc->flags) & RT2560_RX_BUSY) ||
                    (le32toh(desc->flags) & RT2560_RX_CIPHER_BUSY))
                        break;

                if (data->drop) {
                        counter_u64_add(ic->ic_ierrors, 1);
                        goto skip;
                }

                if ((le32toh(desc->flags) & RT2560_RX_CIPHER_MASK) != 0 &&
                    (le32toh(desc->flags) & RT2560_RX_ICV_ERROR)) {
                        counter_u64_add(ic->ic_ierrors, 1);
                        goto skip;
                }

                /*
                 * Try to allocate a new mbuf for this ring element and load it
                 * before processing the current mbuf. If the ring element
                 * cannot be loaded, drop the received packet and reuse the old
                 * mbuf. In the unlikely case that the old mbuf can't be
                 * reloaded either, explicitly panic.
                 */
                mnew = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
                if (mnew == NULL) {
                        counter_u64_add(ic->ic_ierrors, 1);
                        goto skip;
                }

                bus_dmamap_sync(sc->rxq.data_dmat, data->map,
                    BUS_DMASYNC_POSTREAD);
                bus_dmamap_unload(sc->rxq.data_dmat, data->map);

                error = bus_dmamap_load(sc->rxq.data_dmat, data->map,
                    mtod(mnew, void *), MCLBYTES, rt2560_dma_map_addr,
                    &physaddr, 0);
                if (error != 0) {
                        m_freem(mnew);

                        /* try to reload the old mbuf */
                        error = bus_dmamap_load(sc->rxq.data_dmat, data->map,
                            mtod(data->m, void *), MCLBYTES,
                            rt2560_dma_map_addr, &physaddr, 0);
                        if (error != 0) {
                                /* very unlikely that it will fail... */
                                panic("%s: could not load old rx mbuf",
                                    device_get_name(sc->sc_dev));
                        }
                        counter_u64_add(ic->ic_ierrors, 1);
                        goto skip;
                }

                /*
                 * New mbuf successfully loaded, update Rx ring and continue
                 * processing.
                 */
                m = data->m;
                data->m = mnew;
                desc->physaddr = htole32(physaddr);

                /* finalize mbuf */
                m->m_pkthdr.len = m->m_len =
                    (le32toh(desc->flags) >> 16) & 0xfff;

                rssi = RT2560_RSSI(sc, desc->rssi);
                nf = RT2560_NOISE_FLOOR;
                if (ieee80211_radiotap_active(ic)) {
                        struct rt2560_rx_radiotap_header *tap = &sc->sc_rxtap;
                        uint32_t tsf_lo, tsf_hi;

                        /* get timestamp (low and high 32 bits) */
                        tsf_hi = RAL_READ(sc, RT2560_CSR17);
                        tsf_lo = RAL_READ(sc, RT2560_CSR16);

                        tap->wr_tsf =
                            htole64(((uint64_t)tsf_hi << 32) | tsf_lo);
                        tap->wr_flags = 0;
                        tap->wr_rate = ieee80211_plcp2rate(desc->rate,
                            (desc->flags & htole32(RT2560_RX_OFDM)) ?
                                IEEE80211_T_OFDM : IEEE80211_T_CCK);
                        tap->wr_antenna = sc->rx_ant;
                        tap->wr_antsignal = nf + rssi;
                        tap->wr_antnoise = nf;
                }

                sc->sc_flags |= RT2560_F_INPUT_RUNNING;
                RAL_UNLOCK(sc);
                wh = mtod(m, struct ieee80211_frame *);
                ni = ieee80211_find_rxnode(ic,
                    (struct ieee80211_frame_min *)wh);
                if (ni != NULL) {
                        (void) ieee80211_input(ni, m, rssi, nf);
                        ieee80211_free_node(ni);
                } else
                        (void) ieee80211_input_all(ic, m, rssi, nf);

                RAL_LOCK(sc);
                sc->sc_flags &= ~RT2560_F_INPUT_RUNNING;
skip:           desc->flags = htole32(RT2560_RX_BUSY);

                DPRINTFN(sc, 15, "decryption done idx=%u\n", sc->rxq.cur_decrypt);

                sc->rxq.cur_decrypt =
                    (sc->rxq.cur_decrypt + 1) % RT2560_RX_RING_COUNT;
        }

        bus_dmamap_sync(sc->rxq.desc_dmat, sc->rxq.desc_map,
            BUS_DMASYNC_PREWRITE);
}

/*
 * Some frames were received. Pass them to the hardware cipher engine before
 * sending them to the 802.11 layer.
 */
static void
rt2560_rx_intr(struct rt2560_softc *sc)
{
        struct rt2560_rx_desc *desc;
        struct rt2560_rx_data *data;

        bus_dmamap_sync(sc->rxq.desc_dmat, sc->rxq.desc_map,
            BUS_DMASYNC_POSTREAD);

        for (;;) {
                desc = &sc->rxq.desc[sc->rxq.cur];
                data = &sc->rxq.data[sc->rxq.cur];

                if ((le32toh(desc->flags) & RT2560_RX_BUSY) ||
                    (le32toh(desc->flags) & RT2560_RX_CIPHER_BUSY))
                        break;

                data->drop = 0;

                if ((le32toh(desc->flags) & RT2560_RX_PHY_ERROR) ||
                    (le32toh(desc->flags) & RT2560_RX_CRC_ERROR)) {
                        /*
                         * This should not happen since we did not request
                         * to receive those frames when we filled RXCSR0.
                         */
                        DPRINTFN(sc, 5, "PHY or CRC error flags 0x%08x\n",
                            le32toh(desc->flags));
                        data->drop = 1;
                }

                if (((le32toh(desc->flags) >> 16) & 0xfff) > MCLBYTES) {
                        DPRINTFN(sc, 5, "%s\n", "bad length");
                        data->drop = 1;
                }

                /* mark the frame for decryption */
                desc->flags |= htole32(RT2560_RX_CIPHER_BUSY);

                DPRINTFN(sc, 15, "rx done idx=%u\n", sc->rxq.cur);

                sc->rxq.cur = (sc->rxq.cur + 1) % RT2560_RX_RING_COUNT;
        }

        bus_dmamap_sync(sc->rxq.desc_dmat, sc->rxq.desc_map,
            BUS_DMASYNC_PREWRITE);

        /* kick decrypt */
        RAL_WRITE(sc, RT2560_SECCSR0, RT2560_KICK_DECRYPT);
}

static void
rt2560_beacon_update(struct ieee80211vap *vap, int item)
{
        struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;

        setbit(bo->bo_flags, item);
}

/*
 * This function is called periodically in IBSS mode when a new beacon must be
 * sent out.
 */
static void
rt2560_beacon_expire(struct rt2560_softc *sc)
{
        struct ieee80211com *ic = &sc->sc_ic;
        struct rt2560_tx_data *data;

        if (ic->ic_opmode != IEEE80211_M_IBSS &&
            ic->ic_opmode != IEEE80211_M_HOSTAP &&
            ic->ic_opmode != IEEE80211_M_MBSS)
                return; 

        data = &sc->bcnq.data[sc->bcnq.next];
        /*
         * Don't send beacon if bsschan isn't set
         */
        if (data->ni == NULL)
                return;

        bus_dmamap_sync(sc->bcnq.data_dmat, data->map, BUS_DMASYNC_POSTWRITE);
        bus_dmamap_unload(sc->bcnq.data_dmat, data->map);

        /* XXX 1 =>'s mcast frames which means all PS sta's will wakeup! */
        ieee80211_beacon_update(data->ni, data->m, 1);

        rt2560_tx_bcn(sc, data->m, data->ni);

        DPRINTFN(sc, 15, "%s", "beacon expired\n");

        sc->bcnq.next = (sc->bcnq.next + 1) % RT2560_BEACON_RING_COUNT;
}

/* ARGSUSED */
static void
rt2560_wakeup_expire(struct rt2560_softc *sc)
{
        DPRINTFN(sc, 2, "%s", "wakeup expired\n");
}

void
rt2560_intr(void *arg)
{
        struct rt2560_softc *sc = arg;
        uint32_t r;

        RAL_LOCK(sc);

        /* disable interrupts */
        RAL_WRITE(sc, RT2560_CSR8, 0xffffffff);

        /* don't re-enable interrupts if we're shutting down */
        if (!(sc->sc_flags & RT2560_F_RUNNING)) {
                RAL_UNLOCK(sc);
                return;
        }

        r = RAL_READ(sc, RT2560_CSR7);
        RAL_WRITE(sc, RT2560_CSR7, r);

        if (r & RT2560_BEACON_EXPIRE)
                rt2560_beacon_expire(sc);

        if (r & RT2560_WAKEUP_EXPIRE)
                rt2560_wakeup_expire(sc);

        if (r & RT2560_ENCRYPTION_DONE)
                rt2560_encryption_intr(sc);

        if (r & RT2560_TX_DONE)
                rt2560_tx_intr(sc);

        if (r & RT2560_PRIO_DONE)
                rt2560_prio_intr(sc);

        if (r & RT2560_DECRYPTION_DONE)
                rt2560_decryption_intr(sc);

        if (r & RT2560_RX_DONE) {
                rt2560_rx_intr(sc);
                rt2560_encryption_intr(sc);
        }

        /* re-enable interrupts */
        RAL_WRITE(sc, RT2560_CSR8, RT2560_INTR_MASK);

        RAL_UNLOCK(sc);
}

#define RAL_SIFS                10      /* us */

#define RT2560_TXRX_TURNAROUND  10      /* us */

static uint8_t
rt2560_plcp_signal(int rate)
{
        switch (rate) {
        /* OFDM rates (cf IEEE Std 802.11a-1999, pp. 14 Table 80) */
        case 12:        return 0xb;
        case 18:        return 0xf;
        case 24:        return 0xa;
        case 36:        return 0xe;
        case 48:        return 0x9;
        case 72:        return 0xd;
        case 96:        return 0x8;
        case 108:       return 0xc;

        /* CCK rates (NB: not IEEE std, device-specific) */
        case 2:         return 0x0;
        case 4:         return 0x1;
        case 11:        return 0x2;
        case 22:        return 0x3;
        }
        return 0xff;            /* XXX unsupported/unknown rate */
}

static void
rt2560_setup_tx_desc(struct rt2560_softc *sc, struct rt2560_tx_desc *desc,
    uint32_t flags, int len, int rate, int encrypt, bus_addr_t physaddr)
{
        struct ieee80211com *ic = &sc->sc_ic;
        uint16_t plcp_length;
        int remainder;

        desc->flags = htole32(flags);
        desc->flags |= htole32(len << 16);

        desc->physaddr = htole32(physaddr);
        desc->wme = htole16(
            RT2560_AIFSN(2) |
            RT2560_LOGCWMIN(3) |
            RT2560_LOGCWMAX(8));

        /* setup PLCP fields */
        desc->plcp_signal  = rt2560_plcp_signal(rate);
        desc->plcp_service = 4;

        len += IEEE80211_CRC_LEN;
        if (ieee80211_rate2phytype(ic->ic_rt, rate) == IEEE80211_T_OFDM) {
                desc->flags |= htole32(RT2560_TX_OFDM);

                plcp_length = len & 0xfff;
                desc->plcp_length_hi = plcp_length >> 6;
                desc->plcp_length_lo = plcp_length & 0x3f;
        } else {
                plcp_length = howmany(16 * len, rate);
                if (rate == 22) {
                        remainder = (16 * len) % 22;
                        if (remainder != 0 && remainder < 7)
                                desc->plcp_service |= RT2560_PLCP_LENGEXT;
                }
                desc->plcp_length_hi = plcp_length >> 8;
                desc->plcp_length_lo = plcp_length & 0xff;

                if (rate != 2 && (ic->ic_flags & IEEE80211_F_SHPREAMBLE))
                        desc->plcp_signal |= 0x08;
        }

        if (!encrypt)
                desc->flags |= htole32(RT2560_TX_VALID);
        desc->flags |= encrypt ? htole32(RT2560_TX_CIPHER_BUSY)
                               : htole32(RT2560_TX_BUSY);
}

static int
rt2560_tx_bcn(struct rt2560_softc *sc, struct mbuf *m0,
    struct ieee80211_node *ni)
{
        struct ieee80211vap *vap = ni->ni_vap;
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        bus_dma_segment_t segs[RT2560_MAX_SCATTER];
        int nsegs, rate, error;

        desc = &sc->bcnq.desc[sc->bcnq.cur];
        data = &sc->bcnq.data[sc->bcnq.cur];

        /* XXX maybe a separate beacon rate? */
        rate = vap->iv_txparms[ieee80211_chan2mode(ni->ni_chan)].mgmtrate;

        error = bus_dmamap_load_mbuf_sg(sc->bcnq.data_dmat, data->map, m0,
            segs, &nsegs, BUS_DMA_NOWAIT);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not map mbuf (error %d)\n",
                    error);
                m_freem(m0);
                return error;
        }

        if (ieee80211_radiotap_active_vap(vap)) {
                struct rt2560_tx_radiotap_header *tap = &sc->sc_txtap;

                tap->wt_flags = 0;
                tap->wt_rate = rate;
                tap->wt_antenna = sc->tx_ant;

                ieee80211_radiotap_tx(vap, m0);
        }

        data->m = m0;
        data->ni = ni;

        rt2560_setup_tx_desc(sc, desc, RT2560_TX_IFS_NEWBACKOFF |
            RT2560_TX_TIMESTAMP, m0->m_pkthdr.len, rate, 0, segs->ds_addr);

        DPRINTFN(sc, 10, "sending beacon frame len=%u idx=%u rate=%u\n",
            m0->m_pkthdr.len, sc->bcnq.cur, rate);

        bus_dmamap_sync(sc->bcnq.data_dmat, data->map, BUS_DMASYNC_PREWRITE);
        bus_dmamap_sync(sc->bcnq.desc_dmat, sc->bcnq.desc_map,
            BUS_DMASYNC_PREWRITE);

        sc->bcnq.cur = (sc->bcnq.cur + 1) % RT2560_BEACON_RING_COUNT;

        return 0;
}

static int
rt2560_tx_mgt(struct rt2560_softc *sc, struct mbuf *m0,
    struct ieee80211_node *ni)
{
        struct ieee80211vap *vap = ni->ni_vap;
        struct ieee80211com *ic = ni->ni_ic;
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        struct ieee80211_frame *wh;
        struct ieee80211_key *k;
        bus_dma_segment_t segs[RT2560_MAX_SCATTER];
        uint16_t dur;
        uint32_t flags = 0;
        int nsegs, rate, error;

        desc = &sc->prioq.desc[sc->prioq.cur];
        data = &sc->prioq.data[sc->prioq.cur];

        rate = ni->ni_txparms->mgmtrate;

        wh = mtod(m0, struct ieee80211_frame *);

        ieee80211_output_seqno_assign(ni, -1, m0);

        if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
                k = ieee80211_crypto_encap(ni, m0);
                if (k == NULL) {
                        m_freem(m0);
                        return ENOBUFS;
                }
        }

        error = bus_dmamap_load_mbuf_sg(sc->prioq.data_dmat, data->map, m0,
            segs, &nsegs, 0);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not map mbuf (error %d)\n",
                    error);
                m_freem(m0);
                return error;
        }

        if (ieee80211_radiotap_active_vap(vap)) {
                struct rt2560_tx_radiotap_header *tap = &sc->sc_txtap;

                tap->wt_flags = 0;
                tap->wt_rate = rate;
                tap->wt_antenna = sc->tx_ant;

                ieee80211_radiotap_tx(vap, m0);
        }

        data->m = m0;
        data->ni = ni;
        /* management frames are not taken into account for amrr */
        data->rix = IEEE80211_FIXED_RATE_NONE;

        wh = mtod(m0, struct ieee80211_frame *);

        if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
                flags |= RT2560_TX_ACK;

                dur = ieee80211_ack_duration(ic->ic_rt,
                    rate, ic->ic_flags & IEEE80211_F_SHPREAMBLE);
                *(uint16_t *)wh->i_dur = htole16(dur);

                /* tell hardware to add timestamp for probe responses */
                if (IEEE80211_IS_MGMT_PROBE_RESP(wh))
                        flags |= RT2560_TX_TIMESTAMP;
        }

        rt2560_setup_tx_desc(sc, desc, flags, m0->m_pkthdr.len, rate, 0,
            segs->ds_addr);

        bus_dmamap_sync(sc->prioq.data_dmat, data->map, BUS_DMASYNC_PREWRITE);
        bus_dmamap_sync(sc->prioq.desc_dmat, sc->prioq.desc_map,
            BUS_DMASYNC_PREWRITE);

        DPRINTFN(sc, 10, "sending mgt frame len=%u idx=%u rate=%u\n",
            m0->m_pkthdr.len, sc->prioq.cur, rate);

        /* kick prio */
        sc->prioq.queued++;
        sc->prioq.cur = (sc->prioq.cur + 1) % RT2560_PRIO_RING_COUNT;
        RAL_WRITE(sc, RT2560_TXCSR0, RT2560_KICK_PRIO);

        return 0;
}

static int
rt2560_sendprot(struct rt2560_softc *sc,
    const struct mbuf *m, struct ieee80211_node *ni, int prot, int rate)
{
        struct ieee80211com *ic = ni->ni_ic;
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        struct mbuf *mprot;
        int protrate, flags, error;
        bus_dma_segment_t segs[RT2560_MAX_SCATTER];
        int nsegs;

        mprot = ieee80211_alloc_prot(ni, m, rate, prot);
        if (mprot == NULL) {
                if_inc_counter(ni->ni_vap->iv_ifp, IFCOUNTER_OERRORS, 1);
                device_printf(sc->sc_dev,
                    "could not allocate mbuf for protection mode %d\n", prot);
                return ENOBUFS;
        }

        desc = &sc->txq.desc[sc->txq.cur_encrypt];
        data = &sc->txq.data[sc->txq.cur_encrypt];

        error = bus_dmamap_load_mbuf_sg(sc->txq.data_dmat, data->map,
            mprot, segs, &nsegs, 0);
        if (error != 0) {
                device_printf(sc->sc_dev,
                    "could not map mbuf (error %d)\n", error);
                m_freem(mprot);
                return error;
        }

        data->m = mprot;
        data->ni = ieee80211_ref_node(ni);
        /* ctl frames are not taken into account for amrr */
        data->rix = IEEE80211_FIXED_RATE_NONE;

        protrate = ieee80211_ctl_rate(ic->ic_rt, rate);
        flags = RT2560_TX_MORE_FRAG;
        if (prot == IEEE80211_PROT_RTSCTS)
                flags |= RT2560_TX_ACK;

        rt2560_setup_tx_desc(sc, desc, flags, mprot->m_pkthdr.len, protrate, 1,
            segs->ds_addr);

        bus_dmamap_sync(sc->txq.data_dmat, data->map,
            BUS_DMASYNC_PREWRITE);

        sc->txq.queued++;
        sc->txq.cur_encrypt = (sc->txq.cur_encrypt + 1) % RT2560_TX_RING_COUNT;

        return 0;
}

static int
rt2560_tx_raw(struct rt2560_softc *sc, struct mbuf *m0,
    struct ieee80211_node *ni, const struct ieee80211_bpf_params *params)
{
        struct ieee80211vap *vap = ni->ni_vap;
        struct ieee80211com *ic = ni->ni_ic;
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        bus_dma_segment_t segs[RT2560_MAX_SCATTER];
        uint32_t flags;
        int nsegs, rate, error;

        desc = &sc->prioq.desc[sc->prioq.cur];
        data = &sc->prioq.data[sc->prioq.cur];

        rate = params->ibp_rate0;
        if (!ieee80211_isratevalid(ic->ic_rt, rate)) {
                /* XXX fall back to mcast/mgmt rate? */
                m_freem(m0);
                return EINVAL;
        }

        flags = 0;
        if ((params->ibp_flags & IEEE80211_BPF_NOACK) == 0)
                flags |= RT2560_TX_ACK;
        if (params->ibp_flags & (IEEE80211_BPF_RTS|IEEE80211_BPF_CTS)) {
                error = rt2560_sendprot(sc, m0, ni,
                    params->ibp_flags & IEEE80211_BPF_RTS ?
                         IEEE80211_PROT_RTSCTS : IEEE80211_PROT_CTSONLY,
                    rate);
                if (error) {
                        m_freem(m0);
                        return error;
                }
                flags |= RT2560_TX_LONG_RETRY | RT2560_TX_IFS_SIFS;
        }

        error = bus_dmamap_load_mbuf_sg(sc->prioq.data_dmat, data->map, m0,
            segs, &nsegs, 0);
        if (error != 0) {
                device_printf(sc->sc_dev, "could not map mbuf (error %d)\n",
                    error);
                m_freem(m0);
                return error;
        }

        if (ieee80211_radiotap_active_vap(vap)) {
                struct rt2560_tx_radiotap_header *tap = &sc->sc_txtap;

                tap->wt_flags = 0;
                tap->wt_rate = rate;
                tap->wt_antenna = sc->tx_ant;

                ieee80211_radiotap_tx(ni->ni_vap, m0);
        }

        data->m = m0;
        data->ni = ni;

        /* XXX need to setup descriptor ourself */
        rt2560_setup_tx_desc(sc, desc, flags, m0->m_pkthdr.len,
            rate, (params->ibp_flags & IEEE80211_BPF_CRYPTO) != 0,
            segs->ds_addr);

        bus_dmamap_sync(sc->prioq.data_dmat, data->map, BUS_DMASYNC_PREWRITE);
        bus_dmamap_sync(sc->prioq.desc_dmat, sc->prioq.desc_map,
            BUS_DMASYNC_PREWRITE);

        DPRINTFN(sc, 10, "sending raw frame len=%u idx=%u rate=%u\n",
            m0->m_pkthdr.len, sc->prioq.cur, rate);

        /* kick prio */
        sc->prioq.queued++;
        sc->prioq.cur = (sc->prioq.cur + 1) % RT2560_PRIO_RING_COUNT;
        RAL_WRITE(sc, RT2560_TXCSR0, RT2560_KICK_PRIO);

        return 0;
}

static int
rt2560_tx_data(struct rt2560_softc *sc, struct mbuf *m0,
    struct ieee80211_node *ni)
{
        struct ieee80211vap *vap = ni->ni_vap;
        struct ieee80211com *ic = ni->ni_ic;
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        struct ieee80211_frame *wh;
        const struct ieee80211_txparam *tp = ni->ni_txparms;
        struct ieee80211_key *k;
        struct mbuf *mnew;
        bus_dma_segment_t segs[RT2560_MAX_SCATTER];
        uint16_t dur;
        uint32_t flags;
        int nsegs, rate, error;

        wh = mtod(m0, struct ieee80211_frame *);

        if (m0->m_flags & M_EAPOL) {
                rate = tp->mgmtrate;
        } else if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
                rate = tp->mcastrate;
        } else if (tp->ucastrate != IEEE80211_FIXED_RATE_NONE) {
                rate = tp->ucastrate;
        } else {
                (void) ieee80211_ratectl_rate(ni, NULL, 0);
                rate = ieee80211_node_get_txrate_dot11rate(ni);
        }

        if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
                k = ieee80211_crypto_encap(ni, m0);
                if (k == NULL) {
                        m_freem(m0);
                        return ENOBUFS;
                }

                /* packet header may have moved, reset our local pointer */
                wh = mtod(m0, struct ieee80211_frame *);
        }

        flags = 0;
        if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
                int prot = IEEE80211_PROT_NONE;
                if (m0->m_pkthdr.len + IEEE80211_CRC_LEN > vap->iv_rtsthreshold)
                        prot = IEEE80211_PROT_RTSCTS;
                else if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
                    ieee80211_rate2phytype(ic->ic_rt, rate) == IEEE80211_T_OFDM)
                        prot = ic->ic_protmode;
                if (prot != IEEE80211_PROT_NONE) {
                        error = rt2560_sendprot(sc, m0, ni, prot, rate);
                        if (error) {
                                m_freem(m0);
                                return error;
                        }
                        flags |= RT2560_TX_LONG_RETRY | RT2560_TX_IFS_SIFS;
                }
        }

        data = &sc->txq.data[sc->txq.cur_encrypt];
        desc = &sc->txq.desc[sc->txq.cur_encrypt];

        error = bus_dmamap_load_mbuf_sg(sc->txq.data_dmat, data->map, m0,
            segs, &nsegs, 0);
        if (error != 0 && error != EFBIG) {
                device_printf(sc->sc_dev, "could not map mbuf (error %d)\n",
                    error);
                m_freem(m0);
                return error;
        }
        if (error != 0) {
                mnew = m_defrag(m0, M_NOWAIT);
                if (mnew == NULL) {
                        device_printf(sc->sc_dev,
                            "could not defragment mbuf\n");
                        m_freem(m0);
                        return ENOBUFS;
                }
                m0 = mnew;

                error = bus_dmamap_load_mbuf_sg(sc->txq.data_dmat, data->map,
                    m0, segs, &nsegs, 0);
                if (error != 0) {
                        device_printf(sc->sc_dev,
                            "could not map mbuf (error %d)\n", error);
                        m_freem(m0);
                        return error;
                }

                /* packet header may have moved, reset our local pointer */
                wh = mtod(m0, struct ieee80211_frame *);
        }

        if (ieee80211_radiotap_active_vap(vap)) {
                struct rt2560_tx_radiotap_header *tap = &sc->sc_txtap;

                tap->wt_flags = 0;
                tap->wt_rate = rate;
                tap->wt_antenna = sc->tx_ant;

                ieee80211_radiotap_tx(vap, m0);
        }

        data->m = m0;
        data->ni = ni;

        /* remember link conditions for rate adaptation algorithm */
        if (tp->ucastrate == IEEE80211_FIXED_RATE_NONE) {
                data->rix = ieee80211_node_get_txrate_dot11rate(ni);
                /* XXX probably need last rssi value and not avg */
                data->rssi = ic->ic_node_getrssi(ni);
        } else
                data->rix = IEEE80211_FIXED_RATE_NONE;

        if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
                flags |= RT2560_TX_ACK;

                dur = ieee80211_ack_duration(ic->ic_rt,
                    rate, ic->ic_flags & IEEE80211_F_SHPREAMBLE);
                *(uint16_t *)wh->i_dur = htole16(dur);
        }

        rt2560_setup_tx_desc(sc, desc, flags, m0->m_pkthdr.len, rate, 1,
            segs->ds_addr);

        bus_dmamap_sync(sc->txq.data_dmat, data->map, BUS_DMASYNC_PREWRITE);
        bus_dmamap_sync(sc->txq.desc_dmat, sc->txq.desc_map,
            BUS_DMASYNC_PREWRITE);

        DPRINTFN(sc, 10, "sending data frame len=%u idx=%u rate=%u\n",
            m0->m_pkthdr.len, sc->txq.cur_encrypt, rate);

        /* kick encrypt */
        sc->txq.queued++;
        sc->txq.cur_encrypt = (sc->txq.cur_encrypt + 1) % RT2560_TX_RING_COUNT;
        RAL_WRITE(sc, RT2560_SECCSR1, RT2560_KICK_ENCRYPT);

        return 0;
}

static int
rt2560_transmit(struct ieee80211com *ic, struct mbuf *m)   
{
        struct rt2560_softc *sc = ic->ic_softc;
        int error;

        RAL_LOCK(sc);
        if ((sc->sc_flags & RT2560_F_RUNNING) == 0) {
                RAL_UNLOCK(sc);
                return (ENXIO);
        }
        error = mbufq_enqueue(&sc->sc_snd, m);
        if (error) {
                RAL_UNLOCK(sc);
                return (error);
        }
        rt2560_start(sc);
        RAL_UNLOCK(sc);

        return (0);
}

static void
rt2560_start(struct rt2560_softc *sc)
{
        struct ieee80211_node *ni;
        struct mbuf *m;

        RAL_LOCK_ASSERT(sc);

        while (sc->txq.queued < RT2560_TX_RING_COUNT - 1 &&
            (m = mbufq_dequeue(&sc->sc_snd)) != NULL) {
                ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
                if (rt2560_tx_data(sc, m, ni) != 0) {
                        if_inc_counter(ni->ni_vap->iv_ifp,
                            IFCOUNTER_OERRORS, 1);
                        ieee80211_free_node(ni);
                        break;
                }
                sc->sc_tx_timer = 5;
        }
}

static void
rt2560_watchdog(void *arg)
{
        struct rt2560_softc *sc = arg;

        RAL_LOCK_ASSERT(sc);

        KASSERT(sc->sc_flags & RT2560_F_RUNNING, ("not running"));

        if (sc->sc_invalid)             /* card ejected */
                return;

        rt2560_encryption_intr(sc);
        rt2560_tx_intr(sc);

        if (sc->sc_tx_timer > 0 && --sc->sc_tx_timer == 0) {
                device_printf(sc->sc_dev, "device timeout\n");
                rt2560_init_locked(sc);
                counter_u64_add(sc->sc_ic.ic_oerrors, 1);
                /* NB: callout is reset in rt2560_init() */
                return;
        }
        callout_reset(&sc->watchdog_ch, hz, rt2560_watchdog, sc);
}

static void
rt2560_parent(struct ieee80211com *ic)
{
        struct rt2560_softc *sc = ic->ic_softc;
        int startall = 0;

        RAL_LOCK(sc);
        if (ic->ic_nrunning > 0) {
                if ((sc->sc_flags & RT2560_F_RUNNING) == 0) {
                        rt2560_init_locked(sc);
                        startall = 1;
                } else
                        rt2560_update_promisc(ic);
        } else if (sc->sc_flags & RT2560_F_RUNNING)
                rt2560_stop_locked(sc);
        RAL_UNLOCK(sc);
        if (startall)
                ieee80211_start_all(ic);
}

static void
rt2560_bbp_write(struct rt2560_softc *sc, uint8_t reg, uint8_t val)
{
        uint32_t tmp;
        int ntries;

        for (ntries = 0; ntries < 100; ntries++) {
                if (!(RAL_READ(sc, RT2560_BBPCSR) & RT2560_BBP_BUSY))
                        break;
                DELAY(1);
        }
        if (ntries == 100) {
                device_printf(sc->sc_dev, "could not write to BBP\n");
                return;
        }

        tmp = RT2560_BBP_WRITE | RT2560_BBP_BUSY | reg << 8 | val;
        RAL_WRITE(sc, RT2560_BBPCSR, tmp);

        DPRINTFN(sc, 15, "BBP R%u <- 0x%02x\n", reg, val);
}

static uint8_t
rt2560_bbp_read(struct rt2560_softc *sc, uint8_t reg)
{
        uint32_t val;
        int ntries;

        for (ntries = 0; ntries < 100; ntries++) {
                if (!(RAL_READ(sc, RT2560_BBPCSR) & RT2560_BBP_BUSY))
                        break;
                DELAY(1);
        }
        if (ntries == 100) {
                device_printf(sc->sc_dev, "could not read from BBP\n");
                return 0;
        }

        val = RT2560_BBP_BUSY | reg << 8;
        RAL_WRITE(sc, RT2560_BBPCSR, val);

        for (ntries = 0; ntries < 100; ntries++) {
                val = RAL_READ(sc, RT2560_BBPCSR);
                if (!(val & RT2560_BBP_BUSY))
                        return val & 0xff;
                DELAY(1);
        }

        device_printf(sc->sc_dev, "could not read from BBP\n");
        return 0;
}

static void
rt2560_rf_write(struct rt2560_softc *sc, uint8_t reg, uint32_t val)
{
        uint32_t tmp;
        int ntries;

        for (ntries = 0; ntries < 100; ntries++) {
                if (!(RAL_READ(sc, RT2560_RFCSR) & RT2560_RF_BUSY))
                        break;
                DELAY(1);
        }
        if (ntries == 100) {
                device_printf(sc->sc_dev, "could not write to RF\n");
                return;
        }

        tmp = RT2560_RF_BUSY | RT2560_RF_20BIT | (val & 0xfffff) << 2 |
            (reg & 0x3);
        RAL_WRITE(sc, RT2560_RFCSR, tmp);

        /* remember last written value in sc */
        sc->rf_regs[reg] = val;

        DPRINTFN(sc, 15, "RF R[%u] <- 0x%05x\n", reg & 0x3, val & 0xfffff);
}

static void
rt2560_set_chan(struct rt2560_softc *sc, struct ieee80211_channel *c)
{
        struct ieee80211com *ic = &sc->sc_ic;
        uint8_t power, tmp;
        u_int i, chan;

        chan = ieee80211_chan2ieee(ic, c);
        KASSERT(chan != 0 && chan != IEEE80211_CHAN_ANY, ("chan 0x%x", chan));

        if (IEEE80211_IS_CHAN_2GHZ(c))
                power = min(sc->txpow[chan - 1], 31);
        else
                power = 31;

        /* adjust txpower using ifconfig settings */
        power -= (100 - ic->ic_txpowlimit) / 8;

        DPRINTFN(sc, 2, "setting channel to %u, txpower to %u\n", chan, power);

        switch (sc->rf_rev) {
        case RT2560_RF_2522:
                rt2560_rf_write(sc, RAL_RF1, 0x00814);
                rt2560_rf_write(sc, RAL_RF2, rt2560_rf2522_r2[chan - 1]);
                rt2560_rf_write(sc, RAL_RF3, power << 7 | 0x00040);
                break;

        case RT2560_RF_2523:
                rt2560_rf_write(sc, RAL_RF1, 0x08804);
                rt2560_rf_write(sc, RAL_RF2, rt2560_rf2523_r2[chan - 1]);
                rt2560_rf_write(sc, RAL_RF3, power << 7 | 0x38044);
                rt2560_rf_write(sc, RAL_RF4, (chan == 14) ? 0x00280 : 0x00286);
                break;

        case RT2560_RF_2524:
                rt2560_rf_write(sc, RAL_RF1, 0x0c808);
                rt2560_rf_write(sc, RAL_RF2, rt2560_rf2524_r2[chan - 1]);
                rt2560_rf_write(sc, RAL_RF3, power << 7 | 0x00040);
                rt2560_rf_write(sc, RAL_RF4, (chan == 14) ? 0x00280 : 0x00286);
                break;

        case RT2560_RF_2525:
                rt2560_rf_write(sc, RAL_RF1, 0x08808);
                rt2560_rf_write(sc, RAL_RF2, rt2560_rf2525_hi_r2[chan - 1]);
                rt2560_rf_write(sc, RAL_RF3, power << 7 | 0x18044);
                rt2560_rf_write(sc, RAL_RF4, (chan == 14) ? 0x00280 : 0x00286);

                rt2560_rf_write(sc, RAL_RF1, 0x08808);
                rt2560_rf_write(sc, RAL_RF2, rt2560_rf2525_r2[chan - 1]);
                rt2560_rf_write(sc, RAL_RF3, power << 7 | 0x18044);
                rt2560_rf_write(sc, RAL_RF4, (chan == 14) ? 0x00280 : 0x00286);
                break;

        case RT2560_RF_2525E:
                rt2560_rf_write(sc, RAL_RF1, 0x08808);
                rt2560_rf_write(sc, RAL_RF2, rt2560_rf2525e_r2[chan - 1]);
                rt2560_rf_write(sc, RAL_RF3, power << 7 | 0x18044);
                rt2560_rf_write(sc, RAL_RF4, (chan == 14) ? 0x00286 : 0x00282);
                break;

        case RT2560_RF_2526:
                rt2560_rf_write(sc, RAL_RF2, rt2560_rf2526_hi_r2[chan - 1]);
                rt2560_rf_write(sc, RAL_RF4, (chan & 1) ? 0x00386 : 0x00381);
                rt2560_rf_write(sc, RAL_RF1, 0x08804);

                rt2560_rf_write(sc, RAL_RF2, rt2560_rf2526_r2[chan - 1]);
                rt2560_rf_write(sc, RAL_RF3, power << 7 | 0x18044);
                rt2560_rf_write(sc, RAL_RF4, (chan & 1) ? 0x00386 : 0x00381);
                break;

        /* dual-band RF */
        case RT2560_RF_5222:
                for (i = 0; rt2560_rf5222[i].chan != chan; i++);

                rt2560_rf_write(sc, RAL_RF1, rt2560_rf5222[i].r1);
                rt2560_rf_write(sc, RAL_RF2, rt2560_rf5222[i].r2);
                rt2560_rf_write(sc, RAL_RF3, power << 7 | 0x00040);
                rt2560_rf_write(sc, RAL_RF4, rt2560_rf5222[i].r4);
                break;
        default: 
                printf("unknown ral rev=%d\n", sc->rf_rev);
        }

        /* XXX */
        if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
                /* set Japan filter bit for channel 14 */
                tmp = rt2560_bbp_read(sc, 70);

                tmp &= ~RT2560_JAPAN_FILTER;
                if (chan == 14)
                        tmp |= RT2560_JAPAN_FILTER;

                rt2560_bbp_write(sc, 70, tmp);

                /* clear CRC errors */
                RAL_READ(sc, RT2560_CNT0);
        }
}

static void
rt2560_getradiocaps(struct ieee80211com *ic,
    int maxchans, int *nchans, struct ieee80211_channel chans[])
{
        struct rt2560_softc *sc = ic->ic_softc;
        uint8_t bands[IEEE80211_MODE_BYTES];

        memset(bands, 0, sizeof(bands));
        setbit(bands, IEEE80211_MODE_11B);
        setbit(bands, IEEE80211_MODE_11G);
        ieee80211_add_channels_default_2ghz(chans, maxchans, nchans, bands, 0);

        if (sc->rf_rev == RT2560_RF_5222) {
                setbit(bands, IEEE80211_MODE_11A);
                ieee80211_add_channel_list_5ghz(chans, maxchans, nchans,
                    rt2560_chan_5ghz, nitems(rt2560_chan_5ghz), bands, 0);
        }
}

static void
rt2560_set_channel(struct ieee80211com *ic)
{
        struct rt2560_softc *sc = ic->ic_softc;

        RAL_LOCK(sc);
        rt2560_set_chan(sc, ic->ic_curchan);
        RAL_UNLOCK(sc);

}

#if 0
/*
 * Disable RF auto-tuning.
 */
static void
rt2560_disable_rf_tune(struct rt2560_softc *sc)
{
        uint32_t tmp;

        if (sc->rf_rev != RT2560_RF_2523) {
                tmp = sc->rf_regs[RAL_RF1] & ~RAL_RF1_AUTOTUNE;
                rt2560_rf_write(sc, RAL_RF1, tmp);
        }

        tmp = sc->rf_regs[RAL_RF3] & ~RAL_RF3_AUTOTUNE;
        rt2560_rf_write(sc, RAL_RF3, tmp);

        DPRINTFN(sc, 2, "%s", "disabling RF autotune\n");
}
#endif

/*
 * Refer to IEEE Std 802.11-1999 pp. 123 for more information on TSF
 * synchronization.
 */
static void
rt2560_enable_tsf_sync(struct rt2560_softc *sc)
{
        struct ieee80211com *ic = &sc->sc_ic;
        struct ieee80211vap *vap = TAILQ_FIRST(&ic->ic_vaps);
        uint16_t logcwmin, preload;
        uint32_t tmp;

        /* first, disable TSF synchronization */
        RAL_WRITE(sc, RT2560_CSR14, 0);

        tmp = 16 * vap->iv_bss->ni_intval;
        RAL_WRITE(sc, RT2560_CSR12, tmp);

        RAL_WRITE(sc, RT2560_CSR13, 0);

        logcwmin = 5;
        preload = (vap->iv_opmode == IEEE80211_M_STA) ? 384 : 1024;
        tmp = logcwmin << 16 | preload;
        RAL_WRITE(sc, RT2560_BCNOCSR, tmp);

        /* finally, enable TSF synchronization */
        tmp = RT2560_ENABLE_TSF | RT2560_ENABLE_TBCN;
        if (ic->ic_opmode == IEEE80211_M_STA)
                tmp |= RT2560_ENABLE_TSF_SYNC(1);
        else
                tmp |= RT2560_ENABLE_TSF_SYNC(2) |
                       RT2560_ENABLE_BEACON_GENERATOR;
        RAL_WRITE(sc, RT2560_CSR14, tmp);

        DPRINTF(sc, "%s", "enabling TSF synchronization\n");
}

static void
rt2560_enable_tsf(struct rt2560_softc *sc)
{
        RAL_WRITE(sc, RT2560_CSR14, 0);
        RAL_WRITE(sc, RT2560_CSR14,
            RT2560_ENABLE_TSF_SYNC(2) | RT2560_ENABLE_TSF);
}

static void
rt2560_update_plcp(struct rt2560_softc *sc)
{
        struct ieee80211com *ic = &sc->sc_ic;

        /* no short preamble for 1Mbps */
        RAL_WRITE(sc, RT2560_PLCP1MCSR, 0x00700400);

        if (!(ic->ic_flags & IEEE80211_F_SHPREAMBLE)) {
                /* values taken from the reference driver */
                RAL_WRITE(sc, RT2560_PLCP2MCSR,   0x00380401);
                RAL_WRITE(sc, RT2560_PLCP5p5MCSR, 0x00150402);
                RAL_WRITE(sc, RT2560_PLCP11MCSR,  0x000b8403);
        } else {
                /* same values as above or'ed 0x8 */
                RAL_WRITE(sc, RT2560_PLCP2MCSR,   0x00380409);
                RAL_WRITE(sc, RT2560_PLCP5p5MCSR, 0x0015040a);
                RAL_WRITE(sc, RT2560_PLCP11MCSR,  0x000b840b);
        }

        DPRINTF(sc, "updating PLCP for %s preamble\n",
            (ic->ic_flags & IEEE80211_F_SHPREAMBLE) ? "short" : "long");
}

/*
 * This function can be called by ieee80211_set_shortslottime(). Refer to
 * IEEE Std 802.11-1999 pp. 85 to know how these values are computed.
 */
static void
rt2560_update_slot(struct ieee80211com *ic)
{
        struct rt2560_softc *sc = ic->ic_softc;
        uint8_t slottime;
        uint16_t tx_sifs, tx_pifs, tx_difs, eifs;
        uint32_t tmp;

#ifndef FORCE_SLOTTIME
        slottime = IEEE80211_GET_SLOTTIME(ic);
#else
        /*
         * Setting slot time according to "short slot time" capability
         * in beacon/probe_resp seems to cause problem to acknowledge
         * certain AP's data frames transimitted at CCK/DS rates: the
         * problematic AP keeps retransmitting data frames, probably
         * because MAC level acks are not received by hardware.
         * So we cheat a little bit here by claiming we are capable of
         * "short slot time" but setting hardware slot time to the normal
         * slot time.  ral(4) does not seem to have trouble to receive
         * frames transmitted using short slot time even if hardware
         * slot time is set to normal slot time.  If we didn't use this
         * trick, we would have to claim that short slot time is not
         * supported; this would give relative poor RX performance
         * (-1Mb~-2Mb lower) and the _whole_ BSS would stop using short
         * slot time.
         */
        slottime = IEEE80211_DUR_SLOT;
#endif

        /* update the MAC slot boundaries */
        tx_sifs = RAL_SIFS - RT2560_TXRX_TURNAROUND;
        tx_pifs = tx_sifs + slottime;
        tx_difs = IEEE80211_DUR_DIFS(tx_sifs, slottime);
        eifs = (ic->ic_curmode == IEEE80211_MODE_11B) ? 364 : 60;

        tmp = RAL_READ(sc, RT2560_CSR11);
        tmp = (tmp & ~0x1f00) | slottime << 8;
        RAL_WRITE(sc, RT2560_CSR11, tmp);

        tmp = tx_pifs << 16 | tx_sifs;
        RAL_WRITE(sc, RT2560_CSR18, tmp);

        tmp = eifs << 16 | tx_difs;
        RAL_WRITE(sc, RT2560_CSR19, tmp);

        DPRINTF(sc, "setting slottime to %uus\n", slottime);
}

static void
rt2560_set_basicrates(struct rt2560_softc *sc,
    const struct ieee80211_rateset *rs)
{
        struct ieee80211com *ic = &sc->sc_ic;
        uint32_t mask = 0;
        uint8_t rate;
        int i;

        for (i = 0; i < rs->rs_nrates; i++) {
                rate = rs->rs_rates[i];

                if (!(rate & IEEE80211_RATE_BASIC))
                        continue;

                mask |= 1 << ieee80211_legacy_rate_lookup(ic->ic_rt,
                    IEEE80211_RV(rate));
        }

        RAL_WRITE(sc, RT2560_ARSP_PLCP_1, mask);

        DPRINTF(sc, "Setting basic rate mask to 0x%x\n", mask);
}

static void
rt2560_update_led(struct rt2560_softc *sc, int led1, int led2)
{
        uint32_t tmp;

        /* set ON period to 70ms and OFF period to 30ms */
        tmp = led1 << 16 | led2 << 17 | 70 << 8 | 30;
        RAL_WRITE(sc, RT2560_LEDCSR, tmp);
}

static void
rt2560_set_bssid(struct rt2560_softc *sc, const uint8_t *bssid)
{
        uint32_t tmp;

        tmp = bssid[0] | bssid[1] << 8 | bssid[2] << 16 | bssid[3] << 24;
        RAL_WRITE(sc, RT2560_CSR5, tmp);

        tmp = bssid[4] | bssid[5] << 8;
        RAL_WRITE(sc, RT2560_CSR6, tmp);

        DPRINTF(sc, "setting BSSID to %6D\n", bssid, ":");
}

static void
rt2560_set_macaddr(struct rt2560_softc *sc, const uint8_t *addr)
{
        uint32_t tmp;

        tmp = addr[0] | addr[1] << 8 | addr[2] << 16 | addr[3] << 24;
        RAL_WRITE(sc, RT2560_CSR3, tmp);

        tmp = addr[4] | addr[5] << 8;
        RAL_WRITE(sc, RT2560_CSR4, tmp);

        DPRINTF(sc, "setting MAC address to %6D\n", addr, ":");
}

static void
rt2560_get_macaddr(struct rt2560_softc *sc, uint8_t *addr)
{
        uint32_t tmp;

        tmp = RAL_READ(sc, RT2560_CSR3);
        addr[0] = tmp & 0xff;
        addr[1] = (tmp >>  8) & 0xff;
        addr[2] = (tmp >> 16) & 0xff;
        addr[3] = (tmp >> 24);

        tmp = RAL_READ(sc, RT2560_CSR4);
        addr[4] = tmp & 0xff;
        addr[5] = (tmp >> 8) & 0xff;
}

static void
rt2560_update_promisc(struct ieee80211com *ic)
{
        struct rt2560_softc *sc = ic->ic_softc;
        uint32_t tmp;

        tmp = RAL_READ(sc, RT2560_RXCSR0);

        tmp &= ~RT2560_DROP_NOT_TO_ME;
        if (ic->ic_promisc == 0)
                tmp |= RT2560_DROP_NOT_TO_ME;

        RAL_WRITE(sc, RT2560_RXCSR0, tmp);

        DPRINTF(sc, "%s promiscuous mode\n",
            (ic->ic_promisc > 0) ?  "entering" : "leaving");
}

static const char *
rt2560_get_rf(int rev)
{
        switch (rev) {
        case RT2560_RF_2522:    return "RT2522";
        case RT2560_RF_2523:    return "RT2523";
        case RT2560_RF_2524:    return "RT2524";
        case RT2560_RF_2525:    return "RT2525";
        case RT2560_RF_2525E:   return "RT2525e";
        case RT2560_RF_2526:    return "RT2526";
        case RT2560_RF_5222:    return "RT5222";
        default:                return "unknown";
        }
}

static void
rt2560_read_config(struct rt2560_softc *sc)
{
        uint16_t val;
        int i;

        val = rt2560_eeprom_read(sc, RT2560_EEPROM_CONFIG0);
        sc->rf_rev =   (val >> 11) & 0x7;
        sc->hw_radio = (val >> 10) & 0x1;
        sc->led_mode = (val >> 6)  & 0x7;
        sc->rx_ant =   (val >> 4)  & 0x3;
        sc->tx_ant =   (val >> 2)  & 0x3;
        sc->nb_ant =   val & 0x3;

        /* read default values for BBP registers */
        for (i = 0; i < 16; i++) {
                val = rt2560_eeprom_read(sc, RT2560_EEPROM_BBP_BASE + i);
                if (val == 0 || val == 0xffff)
                        continue;

                sc->bbp_prom[i].reg = val >> 8;
                sc->bbp_prom[i].val = val & 0xff;
        }

        /* read Tx power for all b/g channels */
        for (i = 0; i < 14 / 2; i++) {
                val = rt2560_eeprom_read(sc, RT2560_EEPROM_TXPOWER + i);
                sc->txpow[i * 2] = val & 0xff;
                sc->txpow[i * 2 + 1] = val >> 8;
        }
        for (i = 0; i < 14; ++i) {
                if (sc->txpow[i] > 31)
                        sc->txpow[i] = 24;
        }

        val = rt2560_eeprom_read(sc, RT2560_EEPROM_CALIBRATE);
        if ((val & 0xff) == 0xff)
                sc->rssi_corr = RT2560_DEFAULT_RSSI_CORR;
        else
                sc->rssi_corr = val & 0xff;
        DPRINTF(sc, "rssi correction %d, calibrate 0x%02x\n",
                 sc->rssi_corr, val);
}

static void
rt2560_scan_start(struct ieee80211com *ic)
{
        struct rt2560_softc *sc = ic->ic_softc;

        /* abort TSF synchronization */
        RAL_WRITE(sc, RT2560_CSR14, 0);
        rt2560_set_bssid(sc, ieee80211broadcastaddr);
}

static void
rt2560_scan_end(struct ieee80211com *ic)
{
        struct rt2560_softc *sc = ic->ic_softc;
        struct ieee80211vap *vap = ic->ic_scan->ss_vap;

        rt2560_enable_tsf_sync(sc);
        /* XXX keep local copy */
        rt2560_set_bssid(sc, vap->iv_bss->ni_bssid);
}

static int
rt2560_bbp_init(struct rt2560_softc *sc)
{
        int i, ntries;

        /* wait for BBP to be ready */
        for (ntries = 0; ntries < 100; ntries++) {
                if (rt2560_bbp_read(sc, RT2560_BBP_VERSION) != 0)
                        break;
                DELAY(1);
        }
        if (ntries == 100) {
                device_printf(sc->sc_dev, "timeout waiting for BBP\n");
                return EIO;
        }

        /* initialize BBP registers to default values */
        for (i = 0; i < nitems(rt2560_def_bbp); i++) {
                rt2560_bbp_write(sc, rt2560_def_bbp[i].reg,
                    rt2560_def_bbp[i].val);
        }

        /* initialize BBP registers to values stored in EEPROM */
        for (i = 0; i < 16; i++) {
                if (sc->bbp_prom[i].reg == 0 && sc->bbp_prom[i].val == 0)
                        break;
                rt2560_bbp_write(sc, sc->bbp_prom[i].reg, sc->bbp_prom[i].val);
        }
        rt2560_bbp_write(sc, 17, 0x48); /* XXX restore bbp17 */

        return 0;
}

static void
rt2560_set_txantenna(struct rt2560_softc *sc, int antenna)
{
        uint32_t tmp;
        uint8_t tx;

        tx = rt2560_bbp_read(sc, RT2560_BBP_TX) & ~RT2560_BBP_ANTMASK;
        if (antenna == 1)
                tx |= RT2560_BBP_ANTA;
        else if (antenna == 2)
                tx |= RT2560_BBP_ANTB;
        else
                tx |= RT2560_BBP_DIVERSITY;

        /* need to force I/Q flip for RF 2525e, 2526 and 5222 */
        if (sc->rf_rev == RT2560_RF_2525E || sc->rf_rev == RT2560_RF_2526 ||
            sc->rf_rev == RT2560_RF_5222)
                tx |= RT2560_BBP_FLIPIQ;

        rt2560_bbp_write(sc, RT2560_BBP_TX, tx);

        /* update values for CCK and OFDM in BBPCSR1 */
        tmp = RAL_READ(sc, RT2560_BBPCSR1) & ~0x00070007;
        tmp |= (tx & 0x7) << 16 | (tx & 0x7);
        RAL_WRITE(sc, RT2560_BBPCSR1, tmp);
}

static void
rt2560_set_rxantenna(struct rt2560_softc *sc, int antenna)
{
        uint8_t rx;

        rx = rt2560_bbp_read(sc, RT2560_BBP_RX) & ~RT2560_BBP_ANTMASK;
        if (antenna == 1)
                rx |= RT2560_BBP_ANTA;
        else if (antenna == 2)
                rx |= RT2560_BBP_ANTB;
        else
                rx |= RT2560_BBP_DIVERSITY;

        /* need to force no I/Q flip for RF 2525e and 2526 */
        if (sc->rf_rev == RT2560_RF_2525E || sc->rf_rev == RT2560_RF_2526)
                rx &= ~RT2560_BBP_FLIPIQ;

        rt2560_bbp_write(sc, RT2560_BBP_RX, rx);
}

static void
rt2560_init_locked(struct rt2560_softc *sc)
{
        struct ieee80211com *ic = &sc->sc_ic;
        struct ieee80211vap *vap = TAILQ_FIRST(&ic->ic_vaps);
        uint32_t tmp;
        int i;

        RAL_LOCK_ASSERT(sc);

        rt2560_stop_locked(sc);

        /* setup tx rings */
        tmp = RT2560_PRIO_RING_COUNT << 24 |
              RT2560_ATIM_RING_COUNT << 16 |
              RT2560_TX_RING_COUNT   <<  8 |
              RT2560_TX_DESC_SIZE;

        /* rings must be initialized in this exact order */
        RAL_WRITE(sc, RT2560_TXCSR2, tmp);
        RAL_WRITE(sc, RT2560_TXCSR3, sc->txq.physaddr);
        RAL_WRITE(sc, RT2560_TXCSR5, sc->prioq.physaddr);
        RAL_WRITE(sc, RT2560_TXCSR4, sc->atimq.physaddr);
        RAL_WRITE(sc, RT2560_TXCSR6, sc->bcnq.physaddr);

        /* setup rx ring */
        tmp = RT2560_RX_RING_COUNT << 8 | RT2560_RX_DESC_SIZE;

        RAL_WRITE(sc, RT2560_RXCSR1, tmp);
        RAL_WRITE(sc, RT2560_RXCSR2, sc->rxq.physaddr);

        /* initialize MAC registers to default values */
        for (i = 0; i < nitems(rt2560_def_mac); i++)
                RAL_WRITE(sc, rt2560_def_mac[i].reg, rt2560_def_mac[i].val);

        rt2560_set_macaddr(sc, vap ? vap->iv_myaddr : ic->ic_macaddr);

        /* set basic rate set (will be updated later) */
        RAL_WRITE(sc, RT2560_ARSP_PLCP_1, 0x153);

        rt2560_update_slot(ic);
        rt2560_update_plcp(sc);
        rt2560_update_led(sc, 0, 0);

        RAL_WRITE(sc, RT2560_CSR1, RT2560_RESET_ASIC);
        RAL_WRITE(sc, RT2560_CSR1, RT2560_HOST_READY);

        if (rt2560_bbp_init(sc) != 0) {
                rt2560_stop_locked(sc);
                return;
        }

        rt2560_set_txantenna(sc, sc->tx_ant);
        rt2560_set_rxantenna(sc, sc->rx_ant);

        /* set default BSS channel */
        rt2560_set_chan(sc, ic->ic_curchan);

        /* kick Rx */
        tmp = RT2560_DROP_PHY_ERROR | RT2560_DROP_CRC_ERROR;
        if (ic->ic_opmode != IEEE80211_M_MONITOR) {
                tmp |= RT2560_DROP_CTL | RT2560_DROP_VERSION_ERROR;
                if (ic->ic_opmode != IEEE80211_M_HOSTAP &&
                    ic->ic_opmode != IEEE80211_M_MBSS)
                        tmp |= RT2560_DROP_TODS;
                if (ic->ic_promisc == 0)
                        tmp |= RT2560_DROP_NOT_TO_ME;
        }
        RAL_WRITE(sc, RT2560_RXCSR0, tmp);

        /* clear old FCS and Rx FIFO errors */
        RAL_READ(sc, RT2560_CNT0);
        RAL_READ(sc, RT2560_CNT4);

        /* clear any pending interrupts */
        RAL_WRITE(sc, RT2560_CSR7, 0xffffffff);

        /* enable interrupts */
        RAL_WRITE(sc, RT2560_CSR8, RT2560_INTR_MASK);

        sc->sc_flags |= RT2560_F_RUNNING;

        callout_reset(&sc->watchdog_ch, hz, rt2560_watchdog, sc);
}

static void
rt2560_init(void *priv)
{
        struct rt2560_softc *sc = priv;
        struct ieee80211com *ic = &sc->sc_ic;

        RAL_LOCK(sc);
        rt2560_init_locked(sc);
        RAL_UNLOCK(sc);

        if (sc->sc_flags & RT2560_F_RUNNING)
                ieee80211_start_all(ic);                /* start all vap's */
}

static void
rt2560_stop_locked(struct rt2560_softc *sc)
{
        volatile int *flags = &sc->sc_flags;

        RAL_LOCK_ASSERT(sc);

        while (*flags & RT2560_F_INPUT_RUNNING)
                msleep(sc, &sc->sc_mtx, 0, "ralrunning", hz/10);

        callout_stop(&sc->watchdog_ch);
        sc->sc_tx_timer = 0;

        if (sc->sc_flags & RT2560_F_RUNNING) {
                sc->sc_flags &= ~RT2560_F_RUNNING;

                /* abort Tx */
                RAL_WRITE(sc, RT2560_TXCSR0, RT2560_ABORT_TX);
                
                /* disable Rx */
                RAL_WRITE(sc, RT2560_RXCSR0, RT2560_DISABLE_RX);

                /* reset ASIC (imply reset BBP) */
                RAL_WRITE(sc, RT2560_CSR1, RT2560_RESET_ASIC);
                RAL_WRITE(sc, RT2560_CSR1, 0);

                /* disable interrupts */
                RAL_WRITE(sc, RT2560_CSR8, 0xffffffff);
                
                /* reset Tx and Rx rings */
                rt2560_reset_tx_ring(sc, &sc->txq);
                rt2560_reset_tx_ring(sc, &sc->atimq);
                rt2560_reset_tx_ring(sc, &sc->prioq);
                rt2560_reset_tx_ring(sc, &sc->bcnq);
                rt2560_reset_rx_ring(sc, &sc->rxq);
        }
}

void
rt2560_stop(void *arg)
{
        struct rt2560_softc *sc = arg;

        RAL_LOCK(sc);
        rt2560_stop_locked(sc);
        RAL_UNLOCK(sc);
}

static int
rt2560_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
        const struct ieee80211_bpf_params *params)
{
        struct ieee80211com *ic = ni->ni_ic;
        struct rt2560_softc *sc = ic->ic_softc;

        RAL_LOCK(sc);

        /* prevent management frames from being sent if we're not ready */
        if (!(sc->sc_flags & RT2560_F_RUNNING)) {
                RAL_UNLOCK(sc);
                m_freem(m);
                return ENETDOWN;
        }
        if (sc->prioq.queued >= RT2560_PRIO_RING_COUNT) {
                RAL_UNLOCK(sc);
                m_freem(m);
                return ENOBUFS;         /* XXX */
        }

        if (params == NULL) {
                /*
                 * Legacy path; interpret frame contents to decide
                 * precisely how to send the frame.
                 */
                if (rt2560_tx_mgt(sc, m, ni) != 0)
                        goto bad;
        } else {
                /*
                 * Caller supplied explicit parameters to use in
                 * sending the frame.
                 */
                if (rt2560_tx_raw(sc, m, ni, params))
                        goto bad;
        }
        sc->sc_tx_timer = 5;

        RAL_UNLOCK(sc);

        return 0;
bad:
        RAL_UNLOCK(sc);
        return EIO;             /* XXX */
}