/*      $OpenBSD: rt2560.c,v 1.90 2022/04/21 21:03:02 stsp Exp $  */

/*-
 * 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.
 */

/*-
 * Ralink Technology RT2560 chipset driver
 * http://www.ralinktech.com/
 */

#include "bpfilter.h"

#include <sys/param.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/timeout.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/endian.h>

#include <machine/bus.h>
#include <machine/intr.h>

#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>

#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_amrr.h>
#include <net80211/ieee80211_radiotap.h>

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

#ifdef RAL_DEBUG
#define DPRINTF(x)      do { if (rt2560_debug > 0) printf x; } while (0)
#define DPRINTFN(n, x)  do { if (rt2560_debug >= (n)) printf x; } while (0)
int rt2560_debug = 1;
#else
#define DPRINTF(x)
#define DPRINTFN(n, x)
#endif

int             rt2560_alloc_tx_ring(struct rt2560_softc *,
                    struct rt2560_tx_ring *, int);
void            rt2560_reset_tx_ring(struct rt2560_softc *,
                    struct rt2560_tx_ring *);
void            rt2560_free_tx_ring(struct rt2560_softc *,
                    struct rt2560_tx_ring *);
int             rt2560_alloc_rx_ring(struct rt2560_softc *,
                    struct rt2560_rx_ring *, int);
void            rt2560_reset_rx_ring(struct rt2560_softc *,
                    struct rt2560_rx_ring *);
void            rt2560_free_rx_ring(struct rt2560_softc *,
                    struct rt2560_rx_ring *);
struct          ieee80211_node *rt2560_node_alloc(struct ieee80211com *);
int             rt2560_media_change(struct ifnet *);
void            rt2560_next_scan(void *);
void            rt2560_iter_func(void *, struct ieee80211_node *);
void            rt2560_amrr_timeout(void *);
void            rt2560_newassoc(struct ieee80211com *, struct ieee80211_node *,
                    int);
int             rt2560_newstate(struct ieee80211com *, enum ieee80211_state,
                    int);
uint16_t        rt2560_eeprom_read(struct rt2560_softc *, uint8_t);
void            rt2560_encryption_intr(struct rt2560_softc *);
void            rt2560_tx_intr(struct rt2560_softc *);
void            rt2560_prio_intr(struct rt2560_softc *);
void            rt2560_decryption_intr(struct rt2560_softc *);
void            rt2560_rx_intr(struct rt2560_softc *);
#ifndef IEEE80211_STA_ONLY
void            rt2560_beacon_expire(struct rt2560_softc *);
#endif
void            rt2560_wakeup_expire(struct rt2560_softc *);
#if NBPFILTER > 0
uint8_t         rt2560_rxrate(const struct rt2560_rx_desc *);
#endif
int             rt2560_ack_rate(struct ieee80211com *, int);
uint16_t        rt2560_txtime(int, int, uint32_t);
uint8_t         rt2560_plcp_signal(int);
void            rt2560_setup_tx_desc(struct rt2560_softc *,
                    struct rt2560_tx_desc *, uint32_t, int, int, int,
                    bus_addr_t);
#ifndef IEEE80211_STA_ONLY
int             rt2560_tx_bcn(struct rt2560_softc *, struct mbuf *,
                    struct ieee80211_node *);
#endif
int             rt2560_tx_mgt(struct rt2560_softc *, struct mbuf *,
                    struct ieee80211_node *);
int             rt2560_tx_data(struct rt2560_softc *, struct mbuf *,
                    struct ieee80211_node *);
void            rt2560_start(struct ifnet *);
void            rt2560_watchdog(struct ifnet *);
int             rt2560_ioctl(struct ifnet *, u_long, caddr_t);
void            rt2560_bbp_write(struct rt2560_softc *, uint8_t, uint8_t);
uint8_t         rt2560_bbp_read(struct rt2560_softc *, uint8_t);
void            rt2560_rf_write(struct rt2560_softc *, uint8_t, uint32_t);
void            rt2560_set_chan(struct rt2560_softc *,
                    struct ieee80211_channel *);
void            rt2560_disable_rf_tune(struct rt2560_softc *);
void            rt2560_enable_tsf_sync(struct rt2560_softc *);
void            rt2560_update_plcp(struct rt2560_softc *);
void            rt2560_updateslot(struct ieee80211com *);
void            rt2560_set_slottime(struct rt2560_softc *);
void            rt2560_set_basicrates(struct rt2560_softc *);
void            rt2560_update_led(struct rt2560_softc *, int, int);
void            rt2560_set_bssid(struct rt2560_softc *, uint8_t *);
void            rt2560_set_macaddr(struct rt2560_softc *, uint8_t *);
void            rt2560_get_macaddr(struct rt2560_softc *, uint8_t *);
void            rt2560_update_promisc(struct rt2560_softc *);
void            rt2560_set_txantenna(struct rt2560_softc *, int);
void            rt2560_set_rxantenna(struct rt2560_softc *, int);
const char      *rt2560_get_rf(int);
void            rt2560_read_eeprom(struct rt2560_softc *);
int             rt2560_bbp_init(struct rt2560_softc *);
int             rt2560_init(struct ifnet *);
void            rt2560_stop(struct ifnet *, int);

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;

int
rt2560_attach(void *xsc, int id)
{
        struct rt2560_softc *sc = xsc;
        struct ieee80211com *ic = &sc->sc_ic;
        struct ifnet *ifp = &ic->ic_if;
        int error, i;

        sc->amrr.amrr_min_success_threshold =  1;
        sc->amrr.amrr_max_success_threshold = 15;
        timeout_set(&sc->amrr_to, rt2560_amrr_timeout, sc);
        timeout_set(&sc->scan_to, rt2560_next_scan, sc);

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

        /* retrieve MAC address */
        rt2560_get_macaddr(sc, ic->ic_myaddr);
        printf(", address %s\n", ether_sprintf(ic->ic_myaddr));

        /* retrieve RF rev. no and various other things from EEPROM */
        rt2560_read_eeprom(sc);

        printf("%s: MAC/BBP RT2560 (rev 0x%02x), RF %s\n", sc->sc_dev.dv_xname,
            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) {
                printf("%s: could not allocate Tx ring\n",
                    sc->sc_dev.dv_xname);
                goto fail1;
        }
        error = rt2560_alloc_tx_ring(sc, &sc->atimq, RT2560_ATIM_RING_COUNT);
        if (error != 0) {
                printf("%s: could not allocate ATIM ring\n",
                    sc->sc_dev.dv_xname);
                goto fail2;
        }
        error = rt2560_alloc_tx_ring(sc, &sc->prioq, RT2560_PRIO_RING_COUNT);
        if (error != 0) {
                printf("%s: could not allocate Prio ring\n",
                    sc->sc_dev.dv_xname);
                goto fail3;
        }
        error = rt2560_alloc_tx_ring(sc, &sc->bcnq, RT2560_BEACON_RING_COUNT);
        if (error != 0) {
                printf("%s: could not allocate Beacon ring\n",
                    sc->sc_dev.dv_xname);
                goto fail4;
        }
        error = rt2560_alloc_rx_ring(sc, &sc->rxq, RT2560_RX_RING_COUNT);
        if (error != 0) {
                printf("%s: could not allocate Rx ring\n",
                    sc->sc_dev.dv_xname);
                goto fail5;
        }

        ic->ic_phytype = IEEE80211_T_OFDM; /* not only, but not used */
        ic->ic_opmode = IEEE80211_M_STA; /* default to BSS mode */
        ic->ic_state = IEEE80211_S_INIT;

        /* set device capabilities */
        ic->ic_caps =
            IEEE80211_C_MONITOR |       /* monitor mode supported */
#ifndef IEEE80211_STA_ONLY
            IEEE80211_C_IBSS |          /* IBSS mode supported */
            IEEE80211_C_HOSTAP |        /* HostAp mode supported */
#endif
            IEEE80211_C_TXPMGT |        /* tx power management */
            IEEE80211_C_SHPREAMBLE |    /* short preamble supported */
            IEEE80211_C_SHSLOT |        /* short slot time supported */
            IEEE80211_C_WEP |           /* s/w WEP */
            IEEE80211_C_RSN;            /* WPA/RSN */

        /* set supported .11b and .11g rates */
        ic->ic_sup_rates[IEEE80211_MODE_11B] = ieee80211_std_rateset_11b;
        ic->ic_sup_rates[IEEE80211_MODE_11G] = ieee80211_std_rateset_11g;

        /* set supported .11b and .11g channels (1 through 14) */
        for (i = 1; i <= 14; i++) {
                ic->ic_channels[i].ic_freq =
                    ieee80211_ieee2mhz(i, IEEE80211_CHAN_2GHZ);
                ic->ic_channels[i].ic_flags =
                    IEEE80211_CHAN_CCK | IEEE80211_CHAN_OFDM |
                    IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
        }

        ifp->if_softc = sc;
        ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
        ifp->if_ioctl = rt2560_ioctl;
        ifp->if_start = rt2560_start;
        ifp->if_watchdog = rt2560_watchdog;
        memcpy(ifp->if_xname, sc->sc_dev.dv_xname, IFNAMSIZ);

        if_attach(ifp);
        ieee80211_ifattach(ifp);
        ic->ic_node_alloc = rt2560_node_alloc;
        ic->ic_newassoc = rt2560_newassoc;
        ic->ic_updateslot = rt2560_updateslot;

        /* XXX RTS causes throughput problems -- where is the bug? */
        ic->ic_rtsthreshold = IEEE80211_RTS_MAX;

        /* override state transition machine */
        sc->sc_newstate = ic->ic_newstate;
        ic->ic_newstate = rt2560_newstate;
        ieee80211_media_init(ifp, rt2560_media_change, ieee80211_media_status);

#if NBPFILTER > 0
        bpfattach(&sc->sc_drvbpf, ifp, DLT_IEEE802_11_RADIO,
            sizeof (struct ieee80211_frame) + 64);

        sc->sc_rxtap_len = sizeof sc->sc_rxtapu;
        sc->sc_rxtap.wr_ihdr.it_len = htole16(sc->sc_rxtap_len);
        sc->sc_rxtap.wr_ihdr.it_present = htole32(RT2560_RX_RADIOTAP_PRESENT);

        sc->sc_txtap_len = sizeof sc->sc_txtapu;
        sc->sc_txtap.wt_ihdr.it_len = htole16(sc->sc_txtap_len);
        sc->sc_txtap.wt_ihdr.it_present = htole32(RT2560_TX_RADIOTAP_PRESENT);
#endif
        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:  return ENXIO;
}

int
rt2560_detach(void *xsc)
{
        struct rt2560_softc *sc = xsc;
        struct ifnet *ifp = &sc->sc_ic.ic_if;

        timeout_del(&sc->scan_to);
        timeout_del(&sc->amrr_to);

        ieee80211_ifdetach(ifp);        /* free all nodes */
        if_detach(ifp);

        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);

        return 0;
}

void
rt2560_suspend(void *xsc)
{
        struct rt2560_softc *sc = xsc;
        struct ifnet *ifp = &sc->sc_ic.ic_if;

        if (ifp->if_flags & IFF_RUNNING)
                rt2560_stop(ifp, 1);
}

void
rt2560_wakeup(void *xsc)
{
        struct rt2560_softc *sc = xsc;
        struct ifnet *ifp = &sc->sc_ic.ic_if;

        if (ifp->if_flags & IFF_UP)
                rt2560_init(ifp);
}

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

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

        error = bus_dmamap_create(sc->sc_dmat, count * RT2560_TX_DESC_SIZE, 1,
            count * RT2560_TX_DESC_SIZE, 0, BUS_DMA_NOWAIT, &ring->map);
        if (error != 0) {
                printf("%s: could not create desc DMA map\n",
                    sc->sc_dev.dv_xname);
                goto fail;
        }

        error = bus_dmamem_alloc(sc->sc_dmat, count * RT2560_TX_DESC_SIZE,
            PAGE_SIZE, 0, &ring->seg, 1, &nsegs, BUS_DMA_NOWAIT | BUS_DMA_ZERO);
        if (error != 0) {
                printf("%s: could not allocate DMA memory\n",
                    sc->sc_dev.dv_xname);
                goto fail;
        }

        error = bus_dmamem_map(sc->sc_dmat, &ring->seg, nsegs,
            count * RT2560_TX_DESC_SIZE, (caddr_t *)&ring->desc,
            BUS_DMA_NOWAIT);
        if (error != 0) {
                printf("%s: can't map desc DMA memory\n",
                    sc->sc_dev.dv_xname);
                goto fail;
        }

        error = bus_dmamap_load(sc->sc_dmat, ring->map, ring->desc,
            count * RT2560_TX_DESC_SIZE, NULL, BUS_DMA_NOWAIT);
        if (error != 0) {
                printf("%s: could not load desc DMA map\n",
                    sc->sc_dev.dv_xname);
                goto fail;
        }

        ring->physaddr = ring->map->dm_segs->ds_addr;

        ring->data = mallocarray(count, sizeof (struct rt2560_tx_data),
            M_DEVBUF, M_NOWAIT | M_ZERO);
        if (ring->data == NULL) {
                printf("%s: could not allocate soft data\n",
                    sc->sc_dev.dv_xname);
                error = ENOMEM;
                goto fail;
        }

        for (i = 0; i < count; i++) {
                error = bus_dmamap_create(sc->sc_dmat, MCLBYTES,
                    RT2560_MAX_SCATTER, MCLBYTES, 0, BUS_DMA_NOWAIT,
                    &ring->data[i].map);
                if (error != 0) {
                        printf("%s: could not create DMA map\n",
                            sc->sc_dev.dv_xname);
                        goto fail;
                }
        }

        return 0;

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

void
rt2560_reset_tx_ring(struct rt2560_softc *sc, struct rt2560_tx_ring *ring)
{
        int i;

        for (i = 0; i < ring->count; i++) {
                struct rt2560_tx_desc *desc = &ring->desc[i];
                struct rt2560_tx_data *data = &ring->data[i];

                if (data->m != NULL) {
                        bus_dmamap_sync(sc->sc_dmat, data->map, 0,
                            data->map->dm_mapsize, BUS_DMASYNC_POSTWRITE);
                        bus_dmamap_unload(sc->sc_dmat, data->map);
                        m_freem(data->m);
                        data->m = NULL;
                }

                /*
                 * The node has already been freed at that point so don't call
                 * ieee80211_release_node() here.
                 */
                data->ni = NULL;

                desc->flags = 0;
        }

        bus_dmamap_sync(sc->sc_dmat, ring->map, 0, ring->map->dm_mapsize,
            BUS_DMASYNC_PREWRITE);

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

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

        if (ring->desc != NULL) {
                bus_dmamap_sync(sc->sc_dmat, ring->map, 0,
                    ring->map->dm_mapsize, BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(sc->sc_dmat, ring->map);
                bus_dmamem_unmap(sc->sc_dmat, (caddr_t)ring->desc,
                    ring->count * RT2560_TX_DESC_SIZE);
                bus_dmamem_free(sc->sc_dmat, &ring->seg, 1);
        }

        if (ring->data != NULL) {
                for (i = 0; i < ring->count; i++) {
                        struct rt2560_tx_data *data = &ring->data[i];

                        if (data->m != NULL) {
                                bus_dmamap_sync(sc->sc_dmat, data->map, 0,
                                    data->map->dm_mapsize,
                                    BUS_DMASYNC_POSTWRITE);
                                bus_dmamap_unload(sc->sc_dmat, data->map);
                                m_freem(data->m);
                        }

                        /*
                         * The node has already been freed at that point so
                         * don't call ieee80211_release_node() here.
                         */
                        data->ni = NULL;

                        if (data->map != NULL)
                                bus_dmamap_destroy(sc->sc_dmat, data->map);
                }
                free(ring->data, M_DEVBUF, ring->count * sizeof *ring->data);
        }
}

int
rt2560_alloc_rx_ring(struct rt2560_softc *sc, struct rt2560_rx_ring *ring,
    int count)
{
        int i, nsegs, error;

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

        error = bus_dmamap_create(sc->sc_dmat, count * RT2560_RX_DESC_SIZE, 1,
            count * RT2560_RX_DESC_SIZE, 0, BUS_DMA_NOWAIT, &ring->map);
        if (error != 0) {
                printf("%s: could not create desc DMA map\n",
                    sc->sc_dev.dv_xname);
                goto fail;
        }

        error = bus_dmamem_alloc(sc->sc_dmat, count * RT2560_RX_DESC_SIZE,
            PAGE_SIZE, 0, &ring->seg, 1, &nsegs, BUS_DMA_NOWAIT | BUS_DMA_ZERO);
        if (error != 0) {
                printf("%s: could not allocate DMA memory\n",
                    sc->sc_dev.dv_xname);
                goto fail;
        }

        error = bus_dmamem_map(sc->sc_dmat, &ring->seg, nsegs,
            count * RT2560_RX_DESC_SIZE, (caddr_t *)&ring->desc,
            BUS_DMA_NOWAIT);
        if (error != 0) {
                printf("%s: can't map desc DMA memory\n",
                    sc->sc_dev.dv_xname);
                goto fail;
        }

        error = bus_dmamap_load(sc->sc_dmat, ring->map, ring->desc,
            count * RT2560_RX_DESC_SIZE, NULL, BUS_DMA_NOWAIT);
        if (error != 0) {
                printf("%s: could not load desc DMA map\n",
                    sc->sc_dev.dv_xname);
                goto fail;
        }

        ring->physaddr = ring->map->dm_segs->ds_addr;

        ring->data = mallocarray(count, sizeof (struct rt2560_rx_data),
            M_DEVBUF, M_NOWAIT | M_ZERO);
        if (ring->data == NULL) {
                printf("%s: could not allocate soft data\n",
                    sc->sc_dev.dv_xname);
                error = ENOMEM;
                goto fail;
        }

        /*
         * Pre-allocate Rx buffers and populate Rx ring.
         */
        for (i = 0; i < count; i++) {
                struct rt2560_rx_desc *desc = &sc->rxq.desc[i];
                struct rt2560_rx_data *data = &sc->rxq.data[i];

                error = bus_dmamap_create(sc->sc_dmat, MCLBYTES, 1, MCLBYTES,
                    0, BUS_DMA_NOWAIT, &data->map);
                if (error != 0) {
                        printf("%s: could not create DMA map\n",
                            sc->sc_dev.dv_xname);
                        goto fail;
                }

                MGETHDR(data->m, M_DONTWAIT, MT_DATA);
                if (data->m == NULL) {
                        printf("%s: could not allocate rx mbuf\n",
                            sc->sc_dev.dv_xname);
                        error = ENOMEM;
                        goto fail;
                }
                MCLGET(data->m, M_DONTWAIT);
                if (!(data->m->m_flags & M_EXT)) {
                        printf("%s: could not allocate rx mbuf cluster\n",
                            sc->sc_dev.dv_xname);
                        error = ENOMEM;
                        goto fail;
                }

                error = bus_dmamap_load(sc->sc_dmat, data->map,
                    mtod(data->m, void *), MCLBYTES, NULL, BUS_DMA_NOWAIT);
                if (error != 0) {
                        printf("%s: could not load rx buf DMA map",
                            sc->sc_dev.dv_xname);
                        goto fail;
                }

                desc->flags = htole32(RT2560_RX_BUSY);
                desc->physaddr = htole32(data->map->dm_segs->ds_addr);
        }

        bus_dmamap_sync(sc->sc_dmat, ring->map, 0, ring->map->dm_mapsize,
            BUS_DMASYNC_PREWRITE);

        return 0;

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

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(sc->sc_dmat, ring->map, 0, ring->map->dm_mapsize,
            BUS_DMASYNC_PREWRITE);

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

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

        if (ring->desc != NULL) {
                bus_dmamap_sync(sc->sc_dmat, ring->map, 0,
                    ring->map->dm_mapsize, BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(sc->sc_dmat, ring->map);
                bus_dmamem_unmap(sc->sc_dmat, (caddr_t)ring->desc,
                    ring->count * RT2560_RX_DESC_SIZE);
                bus_dmamem_free(sc->sc_dmat, &ring->seg, 1);
        }

        if (ring->data != NULL) {
                for (i = 0; i < ring->count; i++) {
                        struct rt2560_rx_data *data = &ring->data[i];

                        if (data->m != NULL) {
                                bus_dmamap_sync(sc->sc_dmat, data->map, 0,
                                    data->map->dm_mapsize,
                                    BUS_DMASYNC_POSTREAD);
                                bus_dmamap_unload(sc->sc_dmat, data->map);
                                m_freem(data->m);
                        }

                        if (data->map != NULL)
                                bus_dmamap_destroy(sc->sc_dmat, data->map);
                }
                free(ring->data, M_DEVBUF, ring->count * sizeof *ring->data);
        }
}

struct ieee80211_node *
rt2560_node_alloc(struct ieee80211com *ic)
{
        return malloc(sizeof (struct rt2560_node), M_DEVBUF,
            M_NOWAIT | M_ZERO);
}

int
rt2560_media_change(struct ifnet *ifp)
{
        int error;

        error = ieee80211_media_change(ifp);
        if (error != ENETRESET)
                return error;

        if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP | IFF_RUNNING))
                rt2560_init(ifp);

        return 0;
}

/*
 * This function is called periodically (every 200ms) during scanning to
 * switch from one channel to another.
 */
void
rt2560_next_scan(void *arg)
{
        struct rt2560_softc *sc = arg;
        struct ieee80211com *ic = &sc->sc_ic;
        struct ifnet *ifp = &ic->ic_if;
        int s;

        s = splnet();
        if (ic->ic_state == IEEE80211_S_SCAN)
                ieee80211_next_scan(ifp);
        splx(s);
}

/*
 * This function is called for each neighbor node.
 */
void
rt2560_iter_func(void *arg, struct ieee80211_node *ni)
{
        struct rt2560_softc *sc = arg;
        struct rt2560_node *rn = (struct rt2560_node *)ni;

        ieee80211_amrr_choose(&sc->amrr, ni, &rn->amn);
}

void
rt2560_amrr_timeout(void *arg)
{
        struct rt2560_softc *sc = arg;
        struct ieee80211com *ic = &sc->sc_ic;
        int s;

        s = splnet();
        if (ic->ic_opmode == IEEE80211_M_STA)
                rt2560_iter_func(sc, ic->ic_bss);
#ifndef IEEE80211_STA_ONLY
        else
                ieee80211_iterate_nodes(ic, rt2560_iter_func, sc);
#endif
        splx(s);

        timeout_add_msec(&sc->amrr_to, 500);
}

void
rt2560_newassoc(struct ieee80211com *ic, struct ieee80211_node *ni, int isnew)
{
        struct rt2560_softc *sc = ic->ic_softc;
        int i;

        ieee80211_amrr_node_init(&sc->amrr, &((struct rt2560_node *)ni)->amn);

        /* set rate to some reasonable initial value */
        for (i = ni->ni_rates.rs_nrates - 1;
             i > 0 && (ni->ni_rates.rs_rates[i] & IEEE80211_RATE_VAL) > 72;
             i--);
        ni->ni_txrate = i;
}

int
rt2560_newstate(struct ieee80211com *ic, enum ieee80211_state nstate, int arg)
{
        struct rt2560_softc *sc = ic->ic_if.if_softc;
        enum ieee80211_state ostate;
        struct ieee80211_node *ni;
        int error = 0;

        ostate = ic->ic_state;
        timeout_del(&sc->scan_to);
        timeout_del(&sc->amrr_to);

        switch (nstate) {
        case IEEE80211_S_INIT:
                if (ostate == IEEE80211_S_RUN) {
                        /* abort TSF synchronization */
                        RAL_WRITE(sc, RT2560_CSR14, 0);

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

        case IEEE80211_S_SCAN:
                rt2560_set_chan(sc, ic->ic_bss->ni_chan);
                timeout_add_msec(&sc->scan_to, 200);
                break;

        case IEEE80211_S_AUTH:
                rt2560_set_chan(sc, ic->ic_bss->ni_chan);
                break;

        case IEEE80211_S_ASSOC:
                rt2560_set_chan(sc, ic->ic_bss->ni_chan);
                break;

        case IEEE80211_S_RUN:
                rt2560_set_chan(sc, ic->ic_bss->ni_chan);

                ni = ic->ic_bss;

                if (ic->ic_opmode != IEEE80211_M_MONITOR) {
                        rt2560_update_plcp(sc);
                        rt2560_set_slottime(sc);
                        rt2560_set_basicrates(sc);
                        rt2560_set_bssid(sc, ni->ni_bssid);
                }

#ifndef IEEE80211_STA_ONLY
                if (ic->ic_opmode == IEEE80211_M_HOSTAP ||
                    ic->ic_opmode == IEEE80211_M_IBSS) {
                        struct mbuf *m = ieee80211_beacon_alloc(ic, ni);
                        if (m == NULL) {
                                printf("%s: could not allocate beacon\n",
                                    sc->sc_dev.dv_xname);
                                error = ENOBUFS;
                                break;
                        }

                        error = rt2560_tx_bcn(sc, m, ni);
                        if (error != 0)
                                break;
                }
#endif

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

                if (ic->ic_opmode == IEEE80211_M_STA) {
                        /* fake a join to init the tx rate */
                        rt2560_newassoc(ic, ni, 1);
                }

                if (ic->ic_opmode != IEEE80211_M_MONITOR) {
                        /* start automatic rate control timer */
                        if (ic->ic_fixed_rate == -1)
                                timeout_add_msec(&sc->amrr_to, 500);

                        rt2560_enable_tsf_sync(sc);
                }
                break;
        }

        return (error != 0) ? error : sc->sc_newstate(ic, nstate, arg);
}

/*
 * Read 16 bits at address 'addr' from the serial EEPROM (either 93C46 or
 * 93C66).
 */
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.
 */
void
rt2560_encryption_intr(struct rt2560_softc *sc)
{
        int hw;

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

        for (; sc->txq.next_encrypt != hw;) {
                struct rt2560_tx_desc *desc =
                    &sc->txq.desc[sc->txq.next_encrypt];

                bus_dmamap_sync(sc->sc_dmat, sc->txq.map,
                    sc->txq.next_encrypt * RT2560_TX_DESC_SIZE,
                    RT2560_TX_DESC_SIZE, BUS_DMASYNC_POSTREAD);

                if (letoh32(desc->flags) &
                    (RT2560_TX_BUSY | RT2560_TX_CIPHER_BUSY))
                        break;

                /* for TKIP, swap eiv field to fix a bug in ASIC */
                if ((letoh32(desc->flags) & RT2560_TX_CIPHER_MASK) ==
                    RT2560_TX_CIPHER_TKIP)
                        desc->eiv = swap32(desc->eiv);

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

                bus_dmamap_sync(sc->sc_dmat, sc->txq.map,
                    sc->txq.next_encrypt * RT2560_TX_DESC_SIZE,
                    RT2560_TX_DESC_SIZE, BUS_DMASYNC_PREWRITE);

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

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

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

void
rt2560_tx_intr(struct rt2560_softc *sc)
{
        struct ieee80211com *ic = &sc->sc_ic;
        struct ifnet *ifp = &ic->ic_if;

        for (;;) {
                struct rt2560_tx_desc *desc = &sc->txq.desc[sc->txq.next];
                struct rt2560_tx_data *data = &sc->txq.data[sc->txq.next];
                struct rt2560_node *rn;

                bus_dmamap_sync(sc->sc_dmat, sc->txq.map,
                    sc->txq.next * RT2560_TX_DESC_SIZE, RT2560_TX_DESC_SIZE,
                    BUS_DMASYNC_POSTREAD);

                if ((letoh32(desc->flags) & RT2560_TX_BUSY) ||
                    (letoh32(desc->flags) & RT2560_TX_CIPHER_BUSY) ||
                    !(letoh32(desc->flags) & RT2560_TX_VALID))
                        break;

                rn = (struct rt2560_node *)data->ni;

                switch (letoh32(desc->flags) & RT2560_TX_RESULT_MASK) {
                case RT2560_TX_SUCCESS:
                        DPRINTFN(10, ("data frame sent successfully\n"));
                        rn->amn.amn_txcnt++;
                        break;

                case RT2560_TX_SUCCESS_RETRY:
                        DPRINTFN(9, ("data frame sent after %u retries\n",
                            (letoh32(desc->flags) >> 5) & 0x7));
                        rn->amn.amn_txcnt++;
                        rn->amn.amn_retrycnt++;
                        break;

                case RT2560_TX_FAIL_RETRY:
                        DPRINTFN(9, ("sending data frame failed (too much "
                            "retries)\n"));
                        rn->amn.amn_txcnt++;
                        rn->amn.amn_retrycnt++;
                        ifp->if_oerrors++;
                        break;

                case RT2560_TX_FAIL_INVALID:
                case RT2560_TX_FAIL_OTHER:
                default:
                        DPRINTF(("%s: sending data frame failed 0x%08x\n",
                            sc->sc_dev.dv_xname, letoh32(desc->flags)));
                        ifp->if_oerrors++;
                        break;
                }

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

                bus_dmamap_sync(sc->sc_dmat, sc->txq.map,
                    sc->txq.next * RT2560_TX_DESC_SIZE, RT2560_TX_DESC_SIZE,
                    BUS_DMASYNC_PREWRITE);

                bus_dmamap_sync(sc->sc_dmat, data->map, 0,
                    data->map->dm_mapsize, BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(sc->sc_dmat, data->map);
                m_freem(data->m);
                data->m = NULL;
                ieee80211_release_node(ic, data->ni);
                data->ni = NULL;

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

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

        if (sc->txq.queued == 0 && sc->prioq.queued == 0)
                sc->sc_tx_timer = 0;
        if (sc->txq.queued < RT2560_TX_RING_COUNT - 1) {
                sc->sc_flags &= ~RT2560_DATA_OACTIVE;
                if (!(sc->sc_flags & (RT2560_DATA_OACTIVE|RT2560_PRIO_OACTIVE)))
                        ifq_clr_oactive(&ifp->if_snd);
                rt2560_start(ifp);
        }
}

void
rt2560_prio_intr(struct rt2560_softc *sc)
{
        struct ieee80211com *ic = &sc->sc_ic;
        struct ifnet *ifp = &ic->ic_if;

        for (;;) {
                struct rt2560_tx_desc *desc = &sc->prioq.desc[sc->prioq.next];
                struct rt2560_tx_data *data = &sc->prioq.data[sc->prioq.next];

                bus_dmamap_sync(sc->sc_dmat, sc->prioq.map,
                    sc->prioq.next * RT2560_TX_DESC_SIZE, RT2560_TX_DESC_SIZE,
                    BUS_DMASYNC_POSTREAD);

                if ((letoh32(desc->flags) & RT2560_TX_BUSY) ||
                    !(letoh32(desc->flags) & RT2560_TX_VALID))
                        break;

                switch (letoh32(desc->flags) & RT2560_TX_RESULT_MASK) {
                case RT2560_TX_SUCCESS:
                        DPRINTFN(10, ("mgt frame sent successfully\n"));
                        break;

                case RT2560_TX_SUCCESS_RETRY:
                        DPRINTFN(9, ("mgt frame sent after %u retries\n",
                            (letoh32(desc->flags) >> 5) & 0x7));
                        break;

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

                case RT2560_TX_FAIL_INVALID:
                case RT2560_TX_FAIL_OTHER:
                default:
                        DPRINTF(("%s: sending mgt frame failed 0x%08x\n",
                            sc->sc_dev.dv_xname, letoh32(desc->flags)));
                        break;
                }

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

                bus_dmamap_sync(sc->sc_dmat, sc->prioq.map,
                    sc->prioq.next * RT2560_TX_DESC_SIZE, RT2560_TX_DESC_SIZE,
                    BUS_DMASYNC_PREWRITE);

                bus_dmamap_sync(sc->sc_dmat, data->map, 0,
                    data->map->dm_mapsize, BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(sc->sc_dmat, data->map);
                m_freem(data->m);
                data->m = NULL;
                ieee80211_release_node(ic, data->ni);
                data->ni = NULL;

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

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

        if (sc->txq.queued == 0 && sc->prioq.queued == 0)
                sc->sc_tx_timer = 0;
        if (sc->prioq.queued < RT2560_PRIO_RING_COUNT) {
                sc->sc_flags &= ~RT2560_PRIO_OACTIVE;
                if (!(sc->sc_flags & (RT2560_DATA_OACTIVE|RT2560_PRIO_OACTIVE)))
                        ifq_clr_oactive(&ifp->if_snd);
                rt2560_start(ifp);
        }
}

/*
 * Some frames were processed by the hardware cipher engine and are ready for
 * transmission to the IEEE802.11 layer.
 */
void
rt2560_decryption_intr(struct rt2560_softc *sc)
{
        struct mbuf_list ml = MBUF_LIST_INITIALIZER();
        struct ieee80211com *ic = &sc->sc_ic;
        struct ifnet *ifp = &ic->ic_if;
        struct ieee80211_frame *wh;
        struct ieee80211_rxinfo rxi;
        struct ieee80211_node *ni;
        struct mbuf *mnew, *m;
        int hw, error;

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

        for (; sc->rxq.cur_decrypt != hw;) {
                struct rt2560_rx_desc *desc =
                    &sc->rxq.desc[sc->rxq.cur_decrypt];
                struct rt2560_rx_data *data =
                    &sc->rxq.data[sc->rxq.cur_decrypt];

                bus_dmamap_sync(sc->sc_dmat, sc->rxq.map,
                    sc->rxq.cur_decrypt * RT2560_TX_DESC_SIZE,
                    RT2560_TX_DESC_SIZE, BUS_DMASYNC_POSTREAD);

                if (letoh32(desc->flags) &
                    (RT2560_RX_BUSY | RT2560_RX_CIPHER_BUSY))
                        break;

                if (data->drop) {
                        ifp->if_ierrors++;
                        goto skip;
                }

                if ((letoh32(desc->flags) & RT2560_RX_CIPHER_MASK) != 0 &&
                    (letoh32(desc->flags) & RT2560_RX_ICV_ERROR)) {
                        ifp->if_ierrors++;
                        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.
                 */
                MGETHDR(mnew, M_DONTWAIT, MT_DATA);
                if (mnew == NULL) {
                        ifp->if_ierrors++;
                        goto skip;
                }
                MCLGET(mnew, M_DONTWAIT);
                if (!(mnew->m_flags & M_EXT)) {
                        m_freem(mnew);
                        ifp->if_ierrors++;
                        goto skip;
                }

                bus_dmamap_sync(sc->sc_dmat, data->map, 0,
                    data->map->dm_mapsize, BUS_DMASYNC_POSTREAD);
                bus_dmamap_unload(sc->sc_dmat, data->map);

                error = bus_dmamap_load(sc->sc_dmat, data->map,
                    mtod(mnew, void *), MCLBYTES, NULL, BUS_DMA_NOWAIT);
                if (error != 0) {
                        m_freem(mnew);

                        /* try to reload the old mbuf */
                        error = bus_dmamap_load(sc->sc_dmat, data->map,
                            mtod(data->m, void *), MCLBYTES, NULL,
                            BUS_DMA_NOWAIT);
                        if (error != 0) {
                                /* very unlikely that it will fail... */
                                panic("%s: could not load old rx mbuf",
                                    sc->sc_dev.dv_xname);
                        }
                        /* physical address may have changed */
                        desc->physaddr = htole32(data->map->dm_segs->ds_addr);
                        ifp->if_ierrors++;
                        goto skip;
                }

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

                /* finalize mbuf */
                m->m_pkthdr.len = m->m_len =
                    (letoh32(desc->flags) >> 16) & 0xfff;

#if NBPFILTER > 0
                if (sc->sc_drvbpf != NULL) {
                        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 = rt2560_rxrate(desc);
                        tap->wr_chan_freq = htole16(ic->ic_ibss_chan->ic_freq);
                        tap->wr_chan_flags =
                            htole16(ic->ic_ibss_chan->ic_flags);
                        tap->wr_antenna = sc->rx_ant;
                        tap->wr_antsignal = desc->rssi;

                        bpf_mtap_hdr(sc->sc_drvbpf, tap, sc->sc_txtap_len, m,
                            BPF_DIRECTION_IN);
                }
#endif
                wh = mtod(m, struct ieee80211_frame *);
                ni = ieee80211_find_rxnode(ic, wh);

                /* send the frame to the 802.11 layer */
                memset(&rxi, 0, sizeof(rxi));
                rxi.rxi_rssi = desc->rssi;
                rxi.rxi_tstamp = 0;     /* unused */
                ieee80211_inputm(ifp, m, ni, &rxi, &ml);

                /* node is no longer needed */
                ieee80211_release_node(ic, ni);

skip:           desc->flags = htole32(RT2560_RX_BUSY);

                bus_dmamap_sync(sc->sc_dmat, sc->rxq.map,
                    sc->rxq.cur_decrypt * RT2560_TX_DESC_SIZE,
                    RT2560_TX_DESC_SIZE, BUS_DMASYNC_PREWRITE);

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

                sc->rxq.cur_decrypt =
                    (sc->rxq.cur_decrypt + 1) % RT2560_RX_RING_COUNT;
        }
        if_input(ifp, &ml);
}

/*
 * Some frames were received. Pass them to the hardware cipher engine before
 * sending them to the 802.11 layer.
 */
void
rt2560_rx_intr(struct rt2560_softc *sc)
{
        for (;;) {
                struct rt2560_rx_desc *desc = &sc->rxq.desc[sc->rxq.cur];
                struct rt2560_rx_data *data = &sc->rxq.data[sc->rxq.cur];

                bus_dmamap_sync(sc->sc_dmat, sc->rxq.map,
                    sc->rxq.cur * RT2560_RX_DESC_SIZE, RT2560_RX_DESC_SIZE,
                    BUS_DMASYNC_POSTREAD);

                if (letoh32(desc->flags) &
                    (RT2560_RX_BUSY | RT2560_RX_CIPHER_BUSY))
                        break;

                data->drop = 0;

                if (letoh32(desc->flags) &
                    (RT2560_RX_PHY_ERROR | RT2560_RX_CRC_ERROR)) {
                        /*
                         * This should not happen since we did not request
                         * to receive those frames when we filled RXCSR0.
                         */
                        DPRINTFN(5, ("PHY or CRC error flags 0x%08x\n",
                            letoh32(desc->flags)));
                        data->drop = 1;
                }

                if (((letoh32(desc->flags) >> 16) & 0xfff) > MCLBYTES) {
                        DPRINTFN(5, ("bad length\n"));
                        data->drop = 1;
                }

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

                bus_dmamap_sync(sc->sc_dmat, sc->rxq.map,
                    sc->rxq.cur * RT2560_RX_DESC_SIZE, RT2560_RX_DESC_SIZE,
                    BUS_DMASYNC_PREWRITE);

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

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

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

#ifndef IEEE80211_STA_ONLY
/*
 * This function is called in HostAP or IBSS modes when it's time to send a
 * new beacon (every ni_intval milliseconds).
 */
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)
                return;

        data = &sc->bcnq.data[sc->bcnq.next];

        if (sc->sc_flags & RT2560_UPDATE_SLOT) {
                sc->sc_flags &= ~RT2560_UPDATE_SLOT;
                sc->sc_flags |= RT2560_SET_SLOTTIME;
        } else if (sc->sc_flags & RT2560_SET_SLOTTIME) {
                sc->sc_flags &= ~RT2560_SET_SLOTTIME;
                rt2560_set_slottime(sc);
        }

        if (ic->ic_curmode == IEEE80211_MODE_11G) {
                /* update ERP Information Element */
                *sc->erp = ic->ic_bss->ni_erp;
                bus_dmamap_sync(sc->sc_dmat, data->map, 0,
                    data->map->dm_mapsize, BUS_DMASYNC_PREWRITE);
        }

#if defined(RT2560_DEBUG) && NBPFILTER > 0
        if (ic->ic_rawbpf != NULL)
                bpf_mtap(ic->ic_rawbpf, data->m, BPF_DIRECTION_OUT);
#endif

        DPRINTFN(15, ("beacon expired\n"));
}
#endif

void
rt2560_wakeup_expire(struct rt2560_softc *sc)
{
        DPRINTFN(15, ("wakeup expired\n"));
}

int
rt2560_intr(void *arg)
{
        struct rt2560_softc *sc = arg;
        struct ifnet *ifp = &sc->sc_ic.ic_if;
        uint32_t r;

        r = RAL_READ(sc, RT2560_CSR7);
        if (__predict_false(r == 0xffffffff))
                return 0;       /* device likely went away */
        if (r == 0)
                return 0;       /* not for us */

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

        /* acknowledge interrupts */
        RAL_WRITE(sc, RT2560_CSR7, r);

        /* don't re-enable interrupts if we're shutting down */
        if (!(ifp->if_flags & IFF_RUNNING))
                return 0;

#ifndef IEEE80211_STA_ONLY
        if (r & RT2560_BEACON_EXPIRE)
                rt2560_beacon_expire(sc);
#endif

        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);

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

        return 1;
}

/* quickly determine if a given rate is CCK or OFDM */
#define RAL_RATE_IS_OFDM(rate) ((rate) >= 12 && (rate) != 22)

#define RAL_ACK_SIZE    14      /* 10 + 4(FCS) */
#define RAL_CTS_SIZE    14      /* 10 + 4(FCS) */

#define RAL_SIFS                10      /* us */

#define RT2560_RXTX_TURNAROUND  10      /* us */

/*
 * This function is only used by the Rx radiotap code. It returns the rate at
 * which a given frame was received.
 */
#if NBPFILTER > 0
uint8_t
rt2560_rxrate(const struct rt2560_rx_desc *desc)
{
        if (letoh32(desc->flags) & RT2560_RX_OFDM) {
                /* reverse function of rt2560_plcp_signal */
                switch (desc->rate) {
                case 0xb:       return 12;
                case 0xf:       return 18;
                case 0xa:       return 24;
                case 0xe:       return 36;
                case 0x9:       return 48;
                case 0xd:       return 72;
                case 0x8:       return 96;
                case 0xc:       return 108;
                }
        } else {
                if (desc->rate == 10)
                        return 2;
                if (desc->rate == 20)
                        return 4;
                if (desc->rate == 55)
                        return 11;
                if (desc->rate == 110)
                        return 22;
        }
        return 2;       /* should not get there */
}
#endif

/*
 * Return the expected ack rate for a frame transmitted at rate `rate'.
 */
int
rt2560_ack_rate(struct ieee80211com *ic, int rate)
{
        switch (rate) {
        /* CCK rates */
        case 2:
                return 2;
        case 4:
        case 11:
        case 22:
                return (ic->ic_curmode == IEEE80211_MODE_11B) ? 4 : rate;

        /* OFDM rates */
        case 12:
        case 18:
                return 12;
        case 24:
        case 36:
                return 24;
        case 48:
        case 72:
        case 96:
        case 108:
                return 48;
        }

        /* default to 1Mbps */
        return 2;
}

/*
 * Compute the duration (in us) needed to transmit `len' bytes at rate `rate'.
 * The function automatically determines the operating mode depending on the
 * given rate. `flags' indicates whether short preamble is in use or not.
 */
uint16_t
rt2560_txtime(int len, int rate, uint32_t flags)
{
        uint16_t txtime;

        if (RAL_RATE_IS_OFDM(rate)) {
                /* IEEE Std 802.11g-2003, pp. 44 */
                txtime = (8 + 4 * len + 3 + rate - 1) / rate;
                txtime = 16 + 4 + 4 * txtime + 6;
        } else {
                /* IEEE Std 802.11b-1999, pp. 28 */
                txtime = (16 * len + rate - 1) / rate;
                if (rate != 2 && (flags & IEEE80211_F_SHPREAMBLE))
                        txtime +=  72 + 24;
                else
                        txtime += 144 + 48;
        }
        return txtime;
}

uint8_t
rt2560_plcp_signal(int rate)
{
        switch (rate) {
        /* CCK rates (returned values are device-dependent) */
        case 2:         return 0x0;
        case 4:         return 0x1;
        case 11:        return 0x2;
        case 22:        return 0x3;

        /* 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;

        /* unsupported rates (should not get there) */
        default:        return 0xff;
        }
}

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->flags |= encrypt ? htole32(RT2560_TX_CIPHER_BUSY) :
            htole32(RT2560_TX_BUSY | RT2560_TX_VALID);

        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 (RAL_RATE_IS_OFDM(rate)) {
                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 = (16 * len + rate - 1) / 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;
        }
}

#ifndef IEEE80211_STA_ONLY
int
rt2560_tx_bcn(struct rt2560_softc *sc, struct mbuf *m0,
    struct ieee80211_node *ni)
{
        struct ieee80211com *ic = &sc->sc_ic;
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        int rate = 2, error;

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

        error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, m0,
            BUS_DMA_NOWAIT);
        if (error != 0) {
                printf("%s: can't map mbuf (error %d)\n",
                    sc->sc_dev.dv_xname, error);
                m_freem(m0);
                return error;
        }

        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,
            data->map->dm_segs->ds_addr);

        bus_dmamap_sync(sc->sc_dmat, data->map, 0, data->map->dm_mapsize,
            BUS_DMASYNC_PREWRITE);
        bus_dmamap_sync(sc->sc_dmat, sc->bcnq.map,
            sc->bcnq.cur * RT2560_TX_DESC_SIZE, RT2560_TX_DESC_SIZE,
            BUS_DMASYNC_PREWRITE);

        /*
         * Store pointer to ERP Information Element so that we can update it
         * dynamically when the slot time changes.
         * XXX: this is ugly since it depends on how net80211 builds beacon
         * frames but ieee80211_beacon_alloc() don't store offsets for us.
         */
        if (ic->ic_curmode == IEEE80211_MODE_11G) {
                sc->erp =
                    mtod(m0, uint8_t *) +
                    sizeof (struct ieee80211_frame) +
                    8 + 2 + 2 +
                    ((ic->ic_userflags & IEEE80211_F_HIDENWID) ?
                        1 : 2 + ni->ni_esslen) +
                    2 + min(ni->ni_rates.rs_nrates, IEEE80211_RATE_SIZE) +
                    2 + 1 +
                    ((ic->ic_opmode == IEEE80211_M_IBSS) ? 4 : 6) +
                    2;
        }

        return 0;
}
#endif

int
rt2560_tx_mgt(struct rt2560_softc *sc, struct mbuf *m0,
    struct ieee80211_node *ni)
{
        struct ieee80211com *ic = &sc->sc_ic;
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        struct ieee80211_frame *wh;
        uint16_t dur;
        uint32_t flags = 0;
        int rate = 2, error;

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

        error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, m0,
            BUS_DMA_NOWAIT);
        if (error != 0) {
                printf("%s: can't map mbuf (error %d)\n",
                    sc->sc_dev.dv_xname, error);
                m_freem(m0);
                return error;
        }

#if NBPFILTER > 0
        if (sc->sc_drvbpf != NULL) {
                struct rt2560_tx_radiotap_header *tap = &sc->sc_txtap;

                tap->wt_flags = 0;
                tap->wt_rate = rate;
                tap->wt_chan_freq = htole16(ic->ic_ibss_chan->ic_freq);
                tap->wt_chan_flags = htole16(ic->ic_ibss_chan->ic_flags);
                tap->wt_antenna = sc->tx_ant;

                bpf_mtap_hdr(sc->sc_drvbpf, tap, sc->sc_txtap_len, m0,
                    BPF_DIRECTION_OUT);
        }
#endif

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

        wh = mtod(m0, struct ieee80211_frame *);

        if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
                flags |= RT2560_TX_NEED_ACK;

                dur = rt2560_txtime(RAL_ACK_SIZE, rate, ic->ic_flags) +
                    RAL_SIFS;
                *(uint16_t *)wh->i_dur = htole16(dur);

#ifndef IEEE80211_STA_ONLY
                /* tell hardware to set timestamp for probe responses */
                if ((wh->i_fc[0] &
                    (IEEE80211_FC0_TYPE_MASK | IEEE80211_FC0_SUBTYPE_MASK)) ==
                    (IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP))
                        flags |= RT2560_TX_TIMESTAMP;
#endif
        }

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

        bus_dmamap_sync(sc->sc_dmat, data->map, 0, data->map->dm_mapsize,
            BUS_DMASYNC_PREWRITE);
        bus_dmamap_sync(sc->sc_dmat, sc->prioq.map,
            sc->prioq.cur * RT2560_TX_DESC_SIZE, RT2560_TX_DESC_SIZE,
            BUS_DMASYNC_PREWRITE);

        DPRINTFN(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;
}

int
rt2560_tx_data(struct rt2560_softc *sc, struct mbuf *m0,
    struct ieee80211_node *ni)
{
        struct ieee80211com *ic = &sc->sc_ic;
        struct rt2560_tx_ring *txq = &sc->txq;
        struct rt2560_tx_desc *desc;
        struct rt2560_tx_data *data;
        struct ieee80211_frame *wh;
        struct ieee80211_key *k;
        struct mbuf *m1;
        uint16_t dur;
        uint32_t flags = 0;
        int pktlen, rate, needcts = 0, needrts = 0, error;

        wh = mtod(m0, struct ieee80211_frame *);

        if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
                k = ieee80211_get_txkey(ic, wh, ni);

                if ((m0 = ieee80211_encrypt(ic, m0, k)) == NULL)
                        return ENOBUFS;

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

        /* compute actual packet length (including CRC and crypto overhead) */
        pktlen = m0->m_pkthdr.len + IEEE80211_CRC_LEN;

        /* pickup a rate */
        if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
            ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) ==
             IEEE80211_FC0_TYPE_MGT)) {
                /* mgmt/multicast frames are sent at the lowest avail. rate */
                rate = ni->ni_rates.rs_rates[0];
        } else if (ic->ic_fixed_rate != -1) {
                rate = ic->ic_sup_rates[ic->ic_curmode].
                    rs_rates[ic->ic_fixed_rate];
        } else
                rate = ni->ni_rates.rs_rates[ni->ni_txrate];
        if (rate == 0)
                rate = 2;       /* XXX should not happen */
        rate &= IEEE80211_RATE_VAL;

        /*
         * Packet Bursting: backoff after ppb=8 frames to give other STAs a
         * chance to contend for the wireless medium.
         */
        if (ic->ic_opmode == IEEE80211_M_STA && (ni->ni_txseq & 7))
                flags |= RT2560_TX_IFS_SIFS;

        /* check if RTS/CTS or CTS-to-self protection must be used */
        if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
                /* multicast frames are not sent at OFDM rates in 802.11b/g */
                if (pktlen > ic->ic_rtsthreshold) {
                        needrts = 1;    /* RTS/CTS based on frame length */
                } else if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
                    RAL_RATE_IS_OFDM(rate)) {
                        if (ic->ic_protmode == IEEE80211_PROT_CTSONLY)
                                needcts = 1;    /* CTS-to-self */
                        else if (ic->ic_protmode == IEEE80211_PROT_RTSCTS)
                                needrts = 1;    /* RTS/CTS */
                }
        }
        if (needrts || needcts) {
                struct mbuf *mprot;
                int protrate, ackrate;

                protrate = 2;   /* XXX */
                ackrate  = rt2560_ack_rate(ic, rate);

                dur = rt2560_txtime(pktlen, rate, ic->ic_flags) +
                      rt2560_txtime(RAL_ACK_SIZE, ackrate, ic->ic_flags) +
                      2 * RAL_SIFS;
                if (needrts) {
                        dur += rt2560_txtime(RAL_CTS_SIZE, rt2560_ack_rate(ic,
                            protrate), ic->ic_flags) + RAL_SIFS;
                        mprot = ieee80211_get_rts(ic, wh, dur);
                } else {
                        mprot = ieee80211_get_cts_to_self(ic, dur);
                }
                if (mprot == NULL) {
                        printf("%s: could not allocate protection frame\n",
                            sc->sc_dev.dv_xname);
                        m_freem(m0);
                        return ENOBUFS;
                }

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

                error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, mprot,
                    BUS_DMA_NOWAIT);
                if (error != 0) {
                        printf("%s: can't map mbuf (error %d)\n",
                            sc->sc_dev.dv_xname, error);
                        m_freem(mprot);
                        m_freem(m0);
                        return error;
                }

                data->m = mprot;
                /* avoid multiple free() of the same node for each fragment */
                data->ni = ieee80211_ref_node(ni);

                /* XXX may want to pass the protection frame to BPF */

                rt2560_setup_tx_desc(sc, desc,
                    (needrts ? RT2560_TX_NEED_ACK : 0) | RT2560_TX_MORE_FRAG,
                    mprot->m_pkthdr.len, protrate, 1,
                    data->map->dm_segs->ds_addr);

                bus_dmamap_sync(sc->sc_dmat, data->map, 0,
                    data->map->dm_mapsize, BUS_DMASYNC_PREWRITE);
                bus_dmamap_sync(sc->sc_dmat, txq->map,
                    txq->cur_encrypt * RT2560_TX_DESC_SIZE,
                    RT2560_TX_DESC_SIZE, BUS_DMASYNC_PREWRITE);

                txq->queued++;
                if (++txq->cur_encrypt >= txq->count)
                        txq->cur_encrypt = 0;

                flags |= RT2560_TX_LONG_RETRY | RT2560_TX_IFS_SIFS;
        }

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

        error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, m0,
            BUS_DMA_NOWAIT);
        if (error != 0 && error != EFBIG) {
                printf("%s: can't map mbuf (error %d)\n",
                    sc->sc_dev.dv_xname, error);
                m_freem(m0);
                return error;
        }
        if (error != 0) {
                /* too many fragments, linearize */
                MGETHDR(m1, M_DONTWAIT, MT_DATA);
                if (m1 == NULL) {
                        m_freem(m0);
                        return ENOBUFS;
                }
                if (m0->m_pkthdr.len > MHLEN) {
                        MCLGET(m1, M_DONTWAIT);
                        if (!(m1->m_flags & M_EXT)) {
                                m_freem(m0);
                                m_freem(m1);
                                return ENOBUFS;
                        }
                }
                m_copydata(m0, 0, m0->m_pkthdr.len, mtod(m1, caddr_t));
                m1->m_pkthdr.len = m1->m_len = m0->m_pkthdr.len;
                m_freem(m0);
                m0 = m1;

                error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, m0,
                    BUS_DMA_NOWAIT);
                if (error != 0) {
                        printf("%s: can't map mbuf (error %d)\n",
                            sc->sc_dev.dv_xname, error);
                        m_freem(m0);
                        return error;
                }

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

#if NBPFILTER > 0
        if (sc->sc_drvbpf != NULL) {
                struct rt2560_tx_radiotap_header *tap = &sc->sc_txtap;

                tap->wt_flags = 0;
                tap->wt_rate = rate;
                tap->wt_chan_freq = htole16(ic->ic_ibss_chan->ic_freq);
                tap->wt_chan_flags = htole16(ic->ic_ibss_chan->ic_flags);
                tap->wt_antenna = sc->tx_ant;

                bpf_mtap_hdr(sc->sc_drvbpf, tap, sc->sc_txtap_len, m0,
                    BPF_DIRECTION_OUT);
        }
#endif

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

        if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
                flags |= RT2560_TX_NEED_ACK;

                dur = rt2560_txtime(RAL_ACK_SIZE, rt2560_ack_rate(ic, rate),
                    ic->ic_flags) + RAL_SIFS;
                *(uint16_t *)wh->i_dur = htole16(dur);
        }

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

        bus_dmamap_sync(sc->sc_dmat, data->map, 0, data->map->dm_mapsize,
            BUS_DMASYNC_PREWRITE);
        bus_dmamap_sync(sc->sc_dmat, txq->map,
            txq->cur_encrypt * RT2560_TX_DESC_SIZE, RT2560_TX_DESC_SIZE,
            BUS_DMASYNC_PREWRITE);

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

        /* kick encrypt */
        txq->queued++;
        if (++txq->cur_encrypt >= txq->count)
                txq->cur_encrypt = 0;
        RAL_WRITE(sc, RT2560_SECCSR1, RT2560_KICK_ENCRYPT);

        return 0;
}

void
rt2560_start(struct ifnet *ifp)
{
        struct rt2560_softc *sc = ifp->if_softc;
        struct ieee80211com *ic = &sc->sc_ic;
        struct mbuf *m0;
        struct ieee80211_node *ni;

        /*
         * net80211 may still try to send management frames even if the
         * IFF_RUNNING flag is not set...
         */
        if (!(ifp->if_flags & IFF_RUNNING) || ifq_is_oactive(&ifp->if_snd))
                return;

        for (;;) {
                if (mq_len(&ic->ic_mgtq) > 0) {
                        if (sc->prioq.queued >= RT2560_PRIO_RING_COUNT) {
                                ifq_set_oactive(&ifp->if_snd);
                                sc->sc_flags |= RT2560_PRIO_OACTIVE;
                                break;
                        }

                        m0 = mq_dequeue(&ic->ic_mgtq);
                        if (m0 == NULL)
                                continue;
                        ni = m0->m_pkthdr.ph_cookie;
#if NBPFILTER > 0
                        if (ic->ic_rawbpf != NULL)
                                bpf_mtap(ic->ic_rawbpf, m0, BPF_DIRECTION_OUT);
#endif
                        if (rt2560_tx_mgt(sc, m0, ni) != 0)
                                break;

                } else {
                        /* Because RTS/CTS requires an extra frame we need
                         * space for 2 frames on the regular Tx queue. */
                        if (sc->txq.queued >= RT2560_TX_RING_COUNT - 1) {
                                ifq_set_oactive(&ifp->if_snd);
                                sc->sc_flags |= RT2560_DATA_OACTIVE;
                                break;
                        }

                        if (ic->ic_state != IEEE80211_S_RUN)
                                break;

                        m0 = ifq_dequeue(&ifp->if_snd);
                        if (m0 == NULL)
                                break;
#if NBPFILTER > 0
                        if (ifp->if_bpf != NULL)
                                bpf_mtap(ifp->if_bpf, m0, BPF_DIRECTION_OUT);
#endif
                        m0 = ieee80211_encap(ifp, m0, &ni);
                        if (m0 == NULL)
                                continue;
#if NBPFILTER > 0
                        if (ic->ic_rawbpf != NULL)
                                bpf_mtap(ic->ic_rawbpf, m0, BPF_DIRECTION_OUT);
#endif
                        if (rt2560_tx_data(sc, m0, ni) != 0) {
                                if (ni != NULL)
                                        ieee80211_release_node(ic, ni);
                                ifp->if_oerrors++;
                                break;
                        }
                }

                sc->sc_tx_timer = 5;
                ifp->if_timer = 1;
        }
}

void
rt2560_watchdog(struct ifnet *ifp)
{
        struct rt2560_softc *sc = ifp->if_softc;

        ifp->if_timer = 0;

        if (sc->sc_tx_timer > 0) {
                if (--sc->sc_tx_timer == 0) {
                        printf("%s: device timeout\n", sc->sc_dev.dv_xname);
                        rt2560_init(ifp);
                        ifp->if_oerrors++;
                        return;
                }
                ifp->if_timer = 1;
        }

        ieee80211_watchdog(ifp);
}

int
rt2560_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
        struct rt2560_softc *sc = ifp->if_softc;
        struct ieee80211com *ic = &sc->sc_ic;
        int s, error = 0;

        s = splnet();

        switch (cmd) {
        case SIOCSIFADDR:
                ifp->if_flags |= IFF_UP;
                /* FALLTHROUGH */
        case SIOCSIFFLAGS:
                if (ifp->if_flags & IFF_UP) {
                        if (ifp->if_flags & IFF_RUNNING)
                                rt2560_update_promisc(sc);
                        else
                                rt2560_init(ifp);
                } else {
                        if (ifp->if_flags & IFF_RUNNING)
                                rt2560_stop(ifp, 1);
                }
                break;

        case SIOCS80211CHANNEL:
                /*
                 * This allows for fast channel switching in monitor mode
                 * (used by kismet). In IBSS mode, we must explicitly reset
                 * the interface to generate a new beacon frame.
                 */
                error = ieee80211_ioctl(ifp, cmd, data);
                if (error == ENETRESET &&
                    ic->ic_opmode == IEEE80211_M_MONITOR) {
                        if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) ==
                            (IFF_UP | IFF_RUNNING))
                                rt2560_set_chan(sc, ic->ic_ibss_chan);
                        error = 0;
                }
                break;

        default:
                error = ieee80211_ioctl(ifp, cmd, data);
        }

        if (error == ENETRESET) {
                if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) ==
                    (IFF_UP | IFF_RUNNING))
                        rt2560_init(ifp);
                error = 0;
        }

        splx(s);

        return error;
}

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) {
                printf("%s: could not write to BBP\n", sc->sc_dev.dv_xname);
                return;
        }

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

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

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) {
                printf("%s: could not read from BBP\n", sc->sc_dev.dv_xname);
                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);
        }

        printf("%s: could not read from BBP\n", sc->sc_dev.dv_xname);
        return 0;
}

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) {
                printf("%s: could not write to RF\n", sc->sc_dev.dv_xname);
                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(15, ("RF R[%u] <- 0x%05x\n", reg & 0x3, val & 0xfffff));
}

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

        chan = ieee80211_chan2ieee(ic, c);
        if (chan == 0 || chan == IEEE80211_CHAN_ANY)
                return;

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

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

        switch (sc->rf_rev) {
        case RT2560_RF_2522:
                rt2560_rf_write(sc, RT2560_RF1, 0x00814);
                rt2560_rf_write(sc, RT2560_RF2, rt2560_rf2522_r2[chan - 1]);
                rt2560_rf_write(sc, RT2560_RF3, power << 7 | 0x00040);
                break;

        case RT2560_RF_2523:
                rt2560_rf_write(sc, RT2560_RF1, 0x08804);
                rt2560_rf_write(sc, RT2560_RF2, rt2560_rf2523_r2[chan - 1]);
                rt2560_rf_write(sc, RT2560_RF3, power << 7 | 0x38044);
                rt2560_rf_write(sc, RT2560_RF4,
                    (chan == 14) ? 0x00280 : 0x00286);
                break;

        case RT2560_RF_2524:
                rt2560_rf_write(sc, RT2560_RF1, 0x0c808);
                rt2560_rf_write(sc, RT2560_RF2, rt2560_rf2524_r2[chan - 1]);
                rt2560_rf_write(sc, RT2560_RF3, power << 7 | 0x00040);
                rt2560_rf_write(sc, RT2560_RF4,
                    (chan == 14) ? 0x00280 : 0x00286);
                break;

        case RT2560_RF_2525:
                rt2560_rf_write(sc, RT2560_RF1, 0x08808);
                rt2560_rf_write(sc, RT2560_RF2, rt2560_rf2525_hi_r2[chan - 1]);
                rt2560_rf_write(sc, RT2560_RF3, power << 7 | 0x18044);
                rt2560_rf_write(sc, RT2560_RF4,
                    (chan == 14) ? 0x00280 : 0x00286);

                rt2560_rf_write(sc, RT2560_RF1, 0x08808);
                rt2560_rf_write(sc, RT2560_RF2, rt2560_rf2525_r2[chan - 1]);
                rt2560_rf_write(sc, RT2560_RF3, power << 7 | 0x18044);
                rt2560_rf_write(sc, RT2560_RF4,
                    (chan == 14) ? 0x00280 : 0x00286);
                break;

        case RT2560_RF_2525E:
                rt2560_rf_write(sc, RT2560_RF1, 0x08808);
                rt2560_rf_write(sc, RT2560_RF2, rt2560_rf2525e_r2[chan - 1]);
                rt2560_rf_write(sc, RT2560_RF3, power << 7 | 0x18044);
                rt2560_rf_write(sc, RT2560_RF4,
                    (chan == 14) ? 0x00286 : 0x00282);
                break;

        case RT2560_RF_2526:
                rt2560_rf_write(sc, RT2560_RF2, rt2560_rf2526_hi_r2[chan - 1]);
                rt2560_rf_write(sc, RT2560_RF4,
                   (chan & 1) ? 0x00386 : 0x00381);
                rt2560_rf_write(sc, RT2560_RF1, 0x08804);

                rt2560_rf_write(sc, RT2560_RF2, rt2560_rf2526_r2[chan - 1]);
                rt2560_rf_write(sc, RT2560_RF3, power << 7 | 0x18044);
                rt2560_rf_write(sc, RT2560_RF4,
                    (chan & 1) ? 0x00386 : 0x00381);
                break;
        }

        if (ic->ic_opmode != IEEE80211_M_MONITOR &&
            ic->ic_state != IEEE80211_S_SCAN) {
                /* 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);

                DELAY(1000); /* RF needs a 1ms delay here */
                rt2560_disable_rf_tune(sc);

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

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

        if (sc->rf_rev != RT2560_RF_2523) {
                tmp = sc->rf_regs[RT2560_RF1] & ~RT2560_RF1_AUTOTUNE;
                rt2560_rf_write(sc, RT2560_RF1, tmp);
        }

        tmp = sc->rf_regs[RT2560_RF3] & ~RT2560_RF3_AUTOTUNE;
        rt2560_rf_write(sc, RT2560_RF3, tmp);

        DPRINTFN(2, ("disabling RF autotune\n"));
}

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

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

        tmp = 16 * ic->ic_bss->ni_intval;
        RAL_WRITE(sc, RT2560_CSR12, tmp);

        RAL_WRITE(sc, RT2560_CSR13, 0);

        logcwmin = 5;
        preload = (ic->ic_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);
#ifndef IEEE80211_STA_ONLY
        else
                tmp |= RT2560_ENABLE_TSF_SYNC(2) |
                       RT2560_ENABLE_BEACON_GENERATOR;
#endif
        RAL_WRITE(sc, RT2560_CSR14, tmp);

        DPRINTF(("enabling TSF synchronization\n"));
}

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

void
rt2560_updateslot(struct ieee80211com *ic)
{
        struct rt2560_softc *sc = ic->ic_if.if_softc;

#ifndef IEEE80211_STA_ONLY
        if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
                /*
                 * In HostAP mode, we defer setting of new slot time until
                 * updated ERP Information Element has propagated to all
                 * associated STAs.
                 */
                sc->sc_flags |= RT2560_UPDATE_SLOT;
        } else
#endif
                rt2560_set_slottime(sc);
}

/*
 * IEEE 802.11a (and possibly 802.11g) use short slot time. Refer to
 * IEEE Std 802.11-1999 pp. 85 to know how these values are computed.
 */
void
rt2560_set_slottime(struct rt2560_softc *sc)
{
        struct ieee80211com *ic = &sc->sc_ic;
        uint8_t slottime;
        uint16_t sifs, pifs, difs, eifs;
        uint32_t tmp;

        slottime = (ic->ic_flags & IEEE80211_F_SHSLOT) ?
            IEEE80211_DUR_DS_SHSLOT : IEEE80211_DUR_DS_SLOT;

        /* define the MAC slot boundaries */
        sifs = RAL_SIFS - RT2560_RXTX_TURNAROUND;
        pifs = sifs + slottime;
        difs = sifs + 2 * 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 = pifs << 16 | sifs;
        RAL_WRITE(sc, RT2560_CSR18, tmp);

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

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

void
rt2560_set_basicrates(struct rt2560_softc *sc)
{
        struct ieee80211com *ic = &sc->sc_ic;

        /* update basic rate set */
        if (ic->ic_curmode == IEEE80211_MODE_11B) {
                /* 11b basic rates: 1, 2Mbps */
                RAL_WRITE(sc, RT2560_ARSP_PLCP_1, 0x3);
        } else {
                /* 11b/g basic rates: 1, 2, 5.5, 11Mbps */
                RAL_WRITE(sc, RT2560_ARSP_PLCP_1, 0xf);
        }
}

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);
}

void
rt2560_set_bssid(struct rt2560_softc *sc, 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(("setting BSSID to %s\n", ether_sprintf(bssid)));
}

void
rt2560_set_macaddr(struct rt2560_softc *sc, 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(("setting MAC address to %s\n", ether_sprintf(addr)));
}

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;
}

void
rt2560_update_promisc(struct rt2560_softc *sc)
{
        struct ifnet *ifp = &sc->sc_ic.ic_if;
        uint32_t tmp;

        tmp = RAL_READ(sc, RT2560_RXCSR0);

        tmp &= ~RT2560_DROP_NOT_TO_ME;
        if (!(ifp->if_flags & IFF_PROMISC))
                tmp |= RT2560_DROP_NOT_TO_ME;

        RAL_WRITE(sc, RT2560_RXCSR0, tmp);

        DPRINTF(("%s promiscuous mode\n", (ifp->if_flags & IFF_PROMISC) ?
            "entering" : "leaving"));
}

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);
}

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);
}

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";
        }
}

void
rt2560_read_eeprom(struct rt2560_softc *sc)
{
        uint16_t val;
        int i;

        val = rt2560_eeprom_read(sc, RT2560_EEPROM_CONFIG0);
        sc->rf_rev =   (val >> 11) & 0x1f;
        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);
                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 >> 8;
                sc->txpow[i * 2 + 1] = val & 0xff;
        }
}

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) {
                printf("%s: timeout waiting for BBP\n", sc->sc_dev.dv_xname);
                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);
        }
#if 0
        /* initialize BBP registers to values stored in EEPROM */
        for (i = 0; i < 16; i++) {
                if (sc->bbp_prom[i].reg == 0xff)
                        continue;
                rt2560_bbp_write(sc, sc->bbp_prom[i].reg, sc->bbp_prom[i].val);
        }
#endif

        return 0;
}

int
rt2560_init(struct ifnet *ifp)
{
        struct rt2560_softc *sc = ifp->if_softc;
        struct ieee80211com *ic = &sc->sc_ic;
        uint32_t tmp;
        int i;

        /* for CardBus, power on the socket */
        if (!(sc->sc_flags & RT2560_ENABLED)) {
                if (sc->sc_enable != NULL && (*sc->sc_enable)(sc) != 0) {
                        printf("%s: could not enable device\n",
                            sc->sc_dev.dv_xname);
                        return EIO;
                }
                sc->sc_flags |= RT2560_ENABLED;
        }

        rt2560_stop(ifp, 0);

        /* 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);

        IEEE80211_ADDR_COPY(ic->ic_myaddr, LLADDR(ifp->if_sadl));
        rt2560_set_macaddr(sc, ic->ic_myaddr);

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

        rt2560_set_slottime(sc);
        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(ifp, 1);
                return EIO;
        }

        rt2560_set_txantenna(sc, 1);
        rt2560_set_rxantenna(sc, 1);

        /* set default BSS channel */
        ic->ic_bss->ni_chan = ic->ic_ibss_chan;
        rt2560_set_chan(sc, ic->ic_bss->ni_chan);

        /* 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;
#ifndef IEEE80211_STA_ONLY
                if (ic->ic_opmode != IEEE80211_M_HOSTAP)
#endif
                        tmp |= RT2560_DROP_TODS;
                if (!(ifp->if_flags & IFF_PROMISC))
                        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);

        ifp->if_flags |= IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);

        if (ic->ic_opmode == IEEE80211_M_MONITOR)
                ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
        else
                ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);

        return 0;
}

void
rt2560_stop(struct ifnet *ifp, int disable)
{
        struct rt2560_softc *sc = ifp->if_softc;
        struct ieee80211com *ic = &sc->sc_ic;

        sc->sc_tx_timer = 0;
        sc->sc_flags &= ~(RT2560_PRIO_OACTIVE|RT2560_DATA_OACTIVE);
        ifp->if_timer = 0;
        ifp->if_flags &= ~IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);

        ieee80211_new_state(ic, IEEE80211_S_INIT, -1);  /* free all nodes */

        /* abort Tx */
        RAL_WRITE(sc, RT2560_TXCSR0, RT2560_ABORT_TX);

        /* disable Rx */
        RAL_WRITE(sc, RT2560_RXCSR0, RT2560_DISABLE_RX);

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

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

        /* clear any pending interrupt */
        RAL_WRITE(sc, RT2560_CSR7, 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);

        /* for CardBus, power down the socket */
        if (disable && sc->sc_disable != NULL) {
                if (sc->sc_flags & RT2560_ENABLED) {
                        (*sc->sc_disable)(sc);
                        sc->sc_flags &= ~RT2560_ENABLED;
                }
        }
}

struct cfdriver ral_cd = {
        NULL, "ral", DV_IFNET
};