* Copyright (c) 2005, 2006

/* $NetBSD: rt2560.c,v 1.40 2021/12/05 02:47:01 msaitoh Exp $ */
/* $OpenBSD: rt2560.c,v 1.15 2006/04/20 20:31:12 miod Exp $ */
/* $FreeBSD: rt2560.c,v 1.3 2006/03/21 21:15:43 damien Exp $*/

/*-
* Copyright (c) 2005, 2006
* Damien Bergamini <[email protected]>
*
* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rt2560.c,v 1.40 2021/12/05 02:47:01 msaitoh Exp $");

#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/callout.h>
#include <sys/conf.h>
#include <sys/device.h>

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

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

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

#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_rssadapt.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 = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n, x)
#endif

static int rt2560_alloc_tx_ring(struct rt2560_softc *,
struct rt2560_tx_ring *, int);
static void rt2560_reset_tx_ring(struct rt2560_softc *,
struct rt2560_tx_ring *);
static void rt2560_free_tx_ring(struct rt2560_softc *,
struct rt2560_tx_ring *);
static int rt2560_alloc_rx_ring(struct rt2560_softc *,
struct rt2560_rx_ring *, int);
static void rt2560_reset_rx_ring(struct rt2560_softc *,
struct rt2560_rx_ring *);
static void rt2560_free_rx_ring(struct rt2560_softc *,
struct rt2560_rx_ring *);
static struct ieee80211_node *
rt2560_node_alloc(struct ieee80211_node_table *);
static int rt2560_media_change(struct ifnet *);
static void rt2560_next_scan(void *);
static void rt2560_iter_func(void *, struct ieee80211_node *);
static void rt2560_update_rssadapt(void *);
static int rt2560_newstate(struct ieee80211com *, enum ieee80211_state,
int);
static uint16_t rt2560_eeprom_read(struct rt2560_softc *, uint8_t);
static void rt2560_encryption_intr(struct rt2560_softc *);
static void rt2560_tx_intr(struct rt2560_softc *);
static void rt2560_prio_intr(struct rt2560_softc *);
static void rt2560_decryption_intr(struct rt2560_softc *);
static void rt2560_rx_intr(struct rt2560_softc *);
static void rt2560_beacon_expire(struct rt2560_softc *);
static void rt2560_wakeup_expire(struct rt2560_softc *);
static uint8_t rt2560_rxrate(struct rt2560_rx_desc *);
static int rt2560_ack_rate(struct ieee80211com *, int);
static uint16_t rt2560_txtime(int, int, uint32_t);
static uint8_t rt2560_plcp_signal(int);
static void rt2560_setup_tx_desc(struct rt2560_softc *,
struct rt2560_tx_desc *, uint32_t, int, int, int,
bus_addr_t);
static int rt2560_tx_bcn(struct rt2560_softc *, struct mbuf *,
struct ieee80211_node *);
static int rt2560_tx_mgt(struct rt2560_softc *, struct mbuf *,
struct ieee80211_node *);
static struct mbuf *rt2560_get_rts(struct rt2560_softc *,
struct ieee80211_frame *, uint16_t);
static int rt2560_tx_data(struct rt2560_softc *, struct mbuf *,
struct ieee80211_node *);
static void rt2560_start(struct ifnet *);
static void rt2560_watchdog(struct ifnet *);
static int rt2560_reset(struct ifnet *);
static int rt2560_ioctl(struct ifnet *, u_long, void *);
static void rt2560_bbp_write(struct rt2560_softc *, uint8_t, uint8_t);
static uint8_t rt2560_bbp_read(struct rt2560_softc *, uint8_t);
static void rt2560_rf_write(struct rt2560_softc *, uint8_t, uint32_t);
static void rt2560_set_chan(struct rt2560_softc *,
struct ieee80211_channel *);
static void rt2560_disable_rf_tune(struct rt2560_softc *);
static void rt2560_enable_tsf_sync(struct rt2560_softc *);
static void rt2560_update_plcp(struct rt2560_softc *);
static void rt2560_update_slot(struct ifnet *);
static void rt2560_set_basicrates(struct rt2560_softc *);
static void rt2560_update_led(struct rt2560_softc *, int, int);
static void rt2560_set_bssid(struct rt2560_softc *, uint8_t *);
static void rt2560_set_macaddr(struct rt2560_softc *, uint8_t *);
static void rt2560_get_macaddr(struct rt2560_softc *, uint8_t *);
static void rt2560_update_promisc(struct rt2560_softc *);
static void rt2560_set_txantenna(struct rt2560_softc *, int);
static void rt2560_set_rxantenna(struct rt2560_softc *, int);
static const char *rt2560_get_rf(int);
static void rt2560_read_eeprom(struct rt2560_softc *);
static int rt2560_bbp_init(struct rt2560_softc *);
static int rt2560_init(struct ifnet *);
static void rt2560_stop(struct ifnet *, int);
static void rt2560_softintr(void *);

/*
* Default values for MAC registers; values taken from the reference driver.
*/
static const struct {
uint32_t reg;
uint32_t val;
} rt2560_def_mac[] = {
{ RT2560_PSCSR0, 0x00020002 },
{ RT2560_PSCSR1, 0x00000002 },
{ RT2560_PSCSR2, 0x00020002 },
{ RT2560_PSCSR3, 0x00000002 },
{ RT2560_TIMECSR, 0x00003f21 },
{ RT2560_CSR9, 0x00000780 },
{ RT2560_CSR11, 0x07041483 },
{ RT2560_CNT3, 0x00000000 },
{ RT2560_TXCSR1, 0x07614562 },
{ RT2560_ARSP_PLCP_0, 0x8c8d8b8a },
{ RT2560_ACKPCTCSR, 0x7038140a },
{ RT2560_ARTCSR1, 0x1d21252d },
{ RT2560_ARTCSR2, 0x1919191d },
{ RT2560_RXCSR0, 0xffffffff },
{ RT2560_RXCSR3, 0xb3aab3af },
{ RT2560_PCICSR, 0x000003b8 },
{ RT2560_PWRCSR0, 0x3f3b3100 },
{ RT2560_GPIOCSR, 0x0000ff00 },
{ RT2560_TESTCSR, 0x000000f0 },
{ RT2560_PWRCSR1, 0x000001ff },
{ RT2560_MACCSR0, 0x00213223 },
{ RT2560_MACCSR1, 0x00235518 },
{ RT2560_RLPWCSR, 0x00000040 },
{ RT2560_RALINKCSR, 0x9a009a11 },
{ RT2560_CSR7, 0xffffffff },
{ RT2560_BBPCSR1, 0x82188200 },
{ RT2560_TXACKCSR0, 0x00000020 },
{ RT2560_SECCSR3, 0x0000e78f }
};

/*
* Default values for BBP registers; values taken from the reference driver.
*/
static const struct {
uint8_t reg;
uint8_t val;
} rt2560_def_bbp[] = {
{ 3, 0x02 },
{ 4, 0x19 },
{ 14, 0x1c },
{ 15, 0x30 },
{ 16, 0xac },
{ 17, 0x48 },
{ 18, 0x18 },
{ 19, 0xff },
{ 20, 0x1e },
{ 21, 0x08 },
{ 22, 0x08 },
{ 23, 0x08 },
{ 24, 0x80 },
{ 25, 0x50 },
{ 26, 0x08 },
{ 27, 0x23 },
{ 30, 0x10 },
{ 31, 0x2b },
{ 32, 0xb9 },
{ 34, 0x12 },
{ 35, 0x50 },
{ 39, 0xc4 },
{ 40, 0x02 },
{ 41, 0x60 },
{ 53, 0x10 },
{ 54, 0x18 },
{ 56, 0x08 },
{ 57, 0x10 },
{ 58, 0x08 },
{ 61, 0x60 },
{ 62, 0x10 },
{ 75, 0xff }
};

/*
* Default values for RF register R2 indexed by channel numbers; values taken
* from the reference driver.
*/
static const uint32_t rt2560_rf2522_r2[] = {
0x307f6, 0x307fb, 0x30800, 0x30805, 0x3080a, 0x3080f, 0x30814,
0x30819, 0x3081e, 0x30823, 0x30828, 0x3082d, 0x30832, 0x3083e
};

static const uint32_t rt2560_rf2523_r2[] = {
0x00327, 0x00328, 0x00329, 0x0032a, 0x0032b, 0x0032c, 0x0032d,
0x0032e, 0x0032f, 0x00340, 0x00341, 0x00342, 0x00343, 0x00346
};

static const uint32_t rt2560_rf2524_r2[] = {
0x00327, 0x00328, 0x00329, 0x0032a, 0x0032b, 0x0032c, 0x0032d,
0x0032e, 0x0032f, 0x00340, 0x00341, 0x00342, 0x00343, 0x00346
};

static const uint32_t rt2560_rf2525_r2[] = {
0x20327, 0x20328, 0x20329, 0x2032a, 0x2032b, 0x2032c, 0x2032d,
0x2032e, 0x2032f, 0x20340, 0x20341, 0x20342, 0x20343, 0x20346
};

static const uint32_t rt2560_rf2525_hi_r2[] = {
0x2032f, 0x20340, 0x20341, 0x20342, 0x20343, 0x20344, 0x20345,
0x20346, 0x20347, 0x20348, 0x20349, 0x2034a, 0x2034b, 0x2034e
};

static const uint32_t rt2560_rf2525e_r2[] = {
0x2044d, 0x2044e, 0x2044f, 0x20460, 0x20461, 0x20462, 0x20463,
0x20464, 0x20465, 0x20466, 0x20467, 0x20468, 0x20469, 0x2046b
};

static const uint32_t rt2560_rf2526_hi_r2[] = {
0x0022a, 0x0022b, 0x0022b, 0x0022c, 0x0022c, 0x0022d, 0x0022d,
0x0022e, 0x0022e, 0x0022f, 0x0022d, 0x00240, 0x00240, 0x00241
};

static const uint32_t rt2560_rf2526_r2[] = {
0x00226, 0x00227, 0x00227, 0x00228, 0x00228, 0x00229, 0x00229,
0x0022a, 0x0022a, 0x0022b, 0x0022b, 0x0022c, 0x0022c, 0x0022d
};

/*
* For dual-band RF, RF registers R1 and R4 also depend on channel number;
* values taken from the reference driver.
*/
static const struct {
uint8_t chan;
uint32_t r1;
uint32_t r2;
uint32_t r4;
} rt2560_rf5222[] = {
{ 1, 0x08808, 0x0044d, 0x00282 },
{ 2, 0x08808, 0x0044e, 0x00282 },
{ 3, 0x08808, 0x0044f, 0x00282 },
{ 4, 0x08808, 0x00460, 0x00282 },
{ 5, 0x08808, 0x00461, 0x00282 },
{ 6, 0x08808, 0x00462, 0x00282 },
{ 7, 0x08808, 0x00463, 0x00282 },
{ 8, 0x08808, 0x00464, 0x00282 },
{ 9, 0x08808, 0x00465, 0x00282 },
{ 10, 0x08808, 0x00466, 0x00282 },
{ 11, 0x08808, 0x00467, 0x00282 },
{ 12, 0x08808, 0x00468, 0x00282 },
{ 13, 0x08808, 0x00469, 0x00282 },
{ 14, 0x08808, 0x0046b, 0x00286 },

{ 36, 0x08804, 0x06225, 0x00287 },
{ 40, 0x08804, 0x06226, 0x00287 },
{ 44, 0x08804, 0x06227, 0x00287 },
{ 48, 0x08804, 0x06228, 0x00287 },
{ 52, 0x08804, 0x06229, 0x00287 },
{ 56, 0x08804, 0x0622a, 0x00287 },
{ 60, 0x08804, 0x0622b, 0x00287 },
{ 64, 0x08804, 0x0622c, 0x00287 },

{ 100, 0x08804, 0x02200, 0x00283 },
{ 104, 0x08804, 0x02201, 0x00283 },
{ 108, 0x08804, 0x02202, 0x00283 },
{ 112, 0x08804, 0x02203, 0x00283 },
{ 116, 0x08804, 0x02204, 0x00283 },
{ 120, 0x08804, 0x02205, 0x00283 },
{ 124, 0x08804, 0x02206, 0x00283 },
{ 128, 0x08804, 0x02207, 0x00283 },
{ 132, 0x08804, 0x02208, 0x00283 },
{ 136, 0x08804, 0x02209, 0x00283 },
{ 140, 0x08804, 0x0220a, 0x00283 },

{ 149, 0x08808, 0x02429, 0x00281 },
{ 153, 0x08808, 0x0242b, 0x00281 },
{ 157, 0x08808, 0x0242d, 0x00281 },
{ 161, 0x08808, 0x0242f, 0x00281 }
};

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

callout_init(&sc->scan_ch, 0);
callout_init(&sc->rssadapt_ch, 0);

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

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

aprint_normal_dev(sc->sc_dev, "802.11 address %s\n",
ether_sprintf(ic->ic_myaddr));

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

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

sc->sc_soft_ih = softint_establish(SOFTINT_NET, rt2560_softintr, sc);
if (sc->sc_soft_ih == NULL) {
aprint_error_dev(sc->sc_dev, "could not establish softint\n)");
goto fail0;
}

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

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

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

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

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

ifp->if_softc = sc;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_init = rt2560_init;
ifp->if_stop = rt2560_stop;
ifp->if_ioctl = rt2560_ioctl;
ifp->if_start = rt2560_start;
ifp->if_watchdog = rt2560_watchdog;
IFQ_SET_READY(&ifp->if_snd);
memcpy(ifp->if_xname, device_xname(sc->sc_dev), IFNAMSIZ);

ic->ic_ifp = ifp;
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_IBSS | /* IBSS mode supported */
IEEE80211_C_MONITOR | /* monitor mode supported */
IEEE80211_C_HOSTAP | /* HostAp mode supported */
IEEE80211_C_TXPMGT | /* tx power management */
IEEE80211_C_SHPREAMBLE | /* short preamble supported */
IEEE80211_C_SHSLOT | /* short slot time supported */
IEEE80211_C_WPA; /* 802.11i */

if (sc->rf_rev == RT2560_RF_5222) {
/* set supported .11a rates */
ic->ic_sup_rates[IEEE80211_MODE_11A] = ieee80211_std_rateset_11a;

/* set supported .11a channels */
for (i = 36; i <= 64; i += 4) {
ic->ic_channels[i].ic_freq =
ieee80211_ieee2mhz(i, IEEE80211_CHAN_5GHZ);
ic->ic_channels[i].ic_flags = IEEE80211_CHAN_A;
}
for (i = 100; i <= 140; i += 4) {
ic->ic_channels[i].ic_freq =
ieee80211_ieee2mhz(i, IEEE80211_CHAN_5GHZ);
ic->ic_channels[i].ic_flags = IEEE80211_CHAN_A;
}
for (i = 149; i <= 161; i += 4) {
ic->ic_channels[i].ic_freq =
ieee80211_ieee2mhz(i, IEEE80211_CHAN_5GHZ);
ic->ic_channels[i].ic_flags = IEEE80211_CHAN_A;
}
}

/* 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;
}

if_initialize(ifp);
ieee80211_ifattach(ic);
/* Use common softint-based if_input */
ifp->if_percpuq = if_percpuq_create(ifp);
if_register(ifp);

ic->ic_node_alloc = rt2560_node_alloc;
ic->ic_updateslot = rt2560_update_slot;
ic->ic_reset = rt2560_reset;

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

bpf_attach2(ifp, DLT_IEEE802_11_RADIO,
sizeof(struct ieee80211_frame) + 64, &sc->sc_drvbpf);

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);

sc->dwelltime = 200;

ieee80211_announce(ic);

if (pmf_device_register(sc->sc_dev, NULL, NULL))
pmf_class_network_register(sc->sc_dev, ifp);
else
aprint_error_dev(sc->sc_dev,
"couldn't establish power handler\n");

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: softint_disestablish(sc->sc_soft_ih);
sc->sc_soft_ih = NULL;
fail0: return ENXIO;
}

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

callout_stop(&sc->scan_ch);
callout_stop(&sc->rssadapt_ch);

pmf_device_deregister(sc->sc_dev);

rt2560_stop(ifp, 1);

ieee80211_ifdetach(&sc->sc_ic); /* 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);

if (sc->sc_soft_ih != NULL) {
softint_disestablish(sc->sc_soft_ih);
sc->sc_soft_ih = NULL;
}

return 0;
}

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) {
aprint_error_dev(sc->sc_dev, "could not create desc DMA map\n");
goto fail;
}

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

error = bus_dmamem_map(sc->sc_dmat, &ring->seg, nsegs,
count * RT2560_TX_DESC_SIZE, (void **)&ring->desc,
BUS_DMA_NOWAIT);
if (error != 0) {
aprint_error_dev(sc->sc_dev, "could not map desc DMA memory\n");
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) {
aprint_error_dev(sc->sc_dev, "could not load desc DMA map\n");
goto fail;
}

memset(ring->desc, 0, count * RT2560_TX_DESC_SIZE);
ring->physaddr = ring->map->dm_segs->ds_addr;

ring->data = malloc(count * sizeof (struct rt2560_tx_data), M_DEVBUF,
M_WAITOK | M_ZERO);

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) {
aprint_error_dev(sc->sc_dev, "could not create DMA map\n");
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)
{
struct rt2560_tx_desc *desc;
struct rt2560_tx_data *data;
int i;

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

if (data->m != NULL) {
bus_dmamap_sync(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;
}

if (data->ni != NULL) {
ieee80211_free_node(data->ni);
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)
{
struct rt2560_tx_data *data;
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, (void *)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++) {
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);
}

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

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

int
rt2560_alloc_rx_ring(struct rt2560_softc *sc, struct rt2560_rx_ring *ring,
int count)
{
struct rt2560_rx_desc *desc;
struct rt2560_rx_data *data;
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) {
aprint_error_dev(sc->sc_dev, "could not create desc DMA map\n");
goto fail;
}

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

error = bus_dmamem_map(sc->sc_dmat, &ring->seg, nsegs,
count * RT2560_RX_DESC_SIZE, (void **)&ring->desc,
BUS_DMA_NOWAIT);
if (error != 0) {
aprint_error_dev(sc->sc_dev, "could not map desc DMA memory\n");
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) {
aprint_error_dev(sc->sc_dev, "could not load desc DMA map\n");
goto fail;
}

memset(ring->desc, 0, count * RT2560_RX_DESC_SIZE);
ring->physaddr = ring->map->dm_segs->ds_addr;

ring->data = malloc(count * sizeof (struct rt2560_rx_data), M_DEVBUF,
M_WAITOK | M_ZERO);

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

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

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

MCLGET(data->m, M_DONTWAIT);
if (!(data->m->m_flags & M_EXT)) {
aprint_error_dev(sc->sc_dev, "could not allocate rx mbuf cluster\n");
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) {
aprint_error_dev(sc->sc_dev, "could not load rx buf DMA map");
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)
{
struct rt2560_rx_data *data;
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, (void *)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++) {
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);
}
}

struct ieee80211_node *
rt2560_node_alloc(struct ieee80211_node_table *nt)
{
struct rt2560_node *rn;

rn = malloc(sizeof (struct rt2560_node), M_80211_NODE,
M_NOWAIT | M_ZERO);

return (rn != NULL) ? &rn->ni : NULL;
}

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;
int s;

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

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

ieee80211_rssadapt_updatestats(&rn->rssadapt);
}

/*
* This function is called periodically (every 100ms) in RUN state to update
* the rate adaptation statistics.
*/
void
rt2560_update_rssadapt(void *arg)
{
struct rt2560_softc *sc = arg;
struct ieee80211com *ic = &sc->sc_ic;
int s;

s = splnet();
ieee80211_iterate_nodes(&ic->ic_sta, rt2560_iter_func, arg);

callout_reset(&sc->rssadapt_ch, hz / 10, rt2560_update_rssadapt, sc);
splx(s);
}

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

ostate = ic->ic_state;
callout_stop(&sc->scan_ch);

switch (nstate) {
case IEEE80211_S_INIT:
callout_stop(&sc->rssadapt_ch);

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_curchan);
callout_reset(&sc->scan_ch, (sc->dwelltime * hz) / 1000,
rt2560_next_scan, sc);
break;

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

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

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

ni = ic->ic_bss;

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

if (ic->ic_opmode == IEEE80211_M_HOSTAP ||
ic->ic_opmode == IEEE80211_M_IBSS) {
m = ieee80211_beacon_alloc(ic, ni, &sc->sc_bo);
if (m == NULL) {
aprint_error_dev(sc->sc_dev, "could not allocate beacon\n");
error = ENOBUFS;
break;
}

ieee80211_ref_node(ni);
error = rt2560_tx_bcn(sc, m, ni);
if (error != 0)
break;
}

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

if (ic->ic_opmode != IEEE80211_M_MONITOR) {
callout_reset(&sc->rssadapt_ch, hz / 10,
rt2560_update_rssadapt, sc);
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)
{
struct rt2560_tx_desc *desc;
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;) {
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 (le32toh(desc->flags) &
(RT2560_TX_BUSY | RT2560_TX_CIPHER_BUSY))
break;

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

/* mark the frame ready for transmission */
desc->flags |= htole32(RT2560_TX_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_ifp;
struct rt2560_tx_desc *desc;
struct rt2560_tx_data *data;
struct rt2560_node *rn;
int s;

s = splnet();

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

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

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

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

switch (le32toh(desc->flags) & RT2560_TX_RESULT_MASK) {
case RT2560_TX_SUCCESS:
DPRINTFN(10, ("data frame sent successfully\n"));
if (data->id.id_node != NULL) {
ieee80211_rssadapt_raise_rate(ic,
&rn->rssadapt, &data->id);
}
if_statinc(ifp, if_opackets);
break;

case RT2560_TX_SUCCESS_RETRY:
DPRINTFN(9, ("data frame sent after %u retries\n",
(le32toh(desc->flags) >> 5) & 0x7));
if_statinc(ifp, if_opackets);
break;

case RT2560_TX_FAIL_RETRY:
DPRINTFN(9, ("sending data frame failed (too much "
"retries)\n"));
if (data->id.id_node != NULL) {
ieee80211_rssadapt_lower_rate(ic, data->ni,
&rn->rssadapt, &data->id);
}
if_statinc(ifp, if_oerrors);
break;

case RT2560_TX_FAIL_INVALID:
case RT2560_TX_FAIL_OTHER:
default:
aprint_error_dev(sc->sc_dev,
"sending data frame failed 0x%08x\n",
le32toh(desc->flags));
if_statinc(ifp, if_oerrors);
}

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_free_node(data->ni);
data->ni = NULL;

/* 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);

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

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

sc->sc_tx_timer = 0;
ifp->if_flags &= ~IFF_OACTIVE;
rt2560_start(ifp); /* in softint */

splx(s);
}

void
rt2560_prio_intr(struct rt2560_softc *sc)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = ic->ic_ifp;
struct rt2560_tx_desc *desc;
struct rt2560_tx_data *data;
int s;

s = splnet();

for (;;) {
desc = &sc->prioq.desc[sc->prioq.next];
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 ((le32toh(desc->flags) & RT2560_TX_BUSY) ||
!(le32toh(desc->flags) & RT2560_TX_VALID))
break;

switch (le32toh(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",
(le32toh(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:
aprint_error_dev(sc->sc_dev, "sending mgt frame failed 0x%08x\n",
le32toh(desc->flags));
}

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_free_node(data->ni);
data->ni = NULL;

/* 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);

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

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

sc->sc_tx_timer = 0;
ifp->if_flags &= ~IFF_OACTIVE;
rt2560_start(ifp); /* in softint */

splx(s);
}

/*
* 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 ieee80211com *ic = &sc->sc_ic;
struct ifnet *ifp = ic->ic_ifp;
struct rt2560_rx_desc *desc;
struct rt2560_rx_data *data;
struct rt2560_node *rn;
struct ieee80211_frame *wh;
struct ieee80211_node *ni;
struct mbuf *mnew, *m;
int hw, error, s;

/* 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;) {
desc = &sc->rxq.desc[sc->rxq.cur_decrypt];
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 (le32toh(desc->flags) &
(RT2560_RX_BUSY | RT2560_RX_CIPHER_BUSY))
break;

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

if ((le32toh(desc->flags) & RT2560_RX_CIPHER_MASK) != 0 &&
(le32toh(desc->flags) & RT2560_RX_ICV_ERROR)) {
if_statinc(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) {
if_statinc(ifp, if_ierrors);
goto skip;
}

MCLGET(mnew, M_DONTWAIT);
if (!(mnew->m_flags & M_EXT)) {
m_freem(mnew);
if_statinc(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",
device_xname(sc->sc_dev));
}
/* physical address may have changed */
desc->physaddr = htole32(data->map->dm_segs->ds_addr);
if_statinc(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_set_rcvif(m, ifp);
m->m_pkthdr.len = m->m_len =
(le32toh(desc->flags) >> 16) & 0xfff;

s = splnet();

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_mtap2(sc->sc_drvbpf, tap, sc->sc_txtap_len, m,
BPF_D_IN);
}

wh = mtod(m, struct ieee80211_frame *);
ni = ieee80211_find_rxnode(ic,
(struct ieee80211_frame_min *)wh);

/* send the frame to the 802.11 layer */
ieee80211_input(ic, m, ni, desc->rssi, 0);

/* give rssi to the rate adatation algorithm */
rn = (struct rt2560_node *)ni;
ieee80211_rssadapt_input(ic, ni, &rn->rssadapt, desc->rssi);

/* node is no longer needed */
ieee80211_free_node(ni);

splx(s);

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;
}

/*
* In HostAP mode, ieee80211_input() will enqueue packets in if_snd
* without calling if_start().
*/
s = splnet();
if (!IFQ_IS_EMPTY(&ifp->if_snd) && !(ifp->if_flags & IFF_OACTIVE))
rt2560_start(ifp);
splx(s);
}

/*
* 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)
{
struct rt2560_rx_desc *desc;
struct rt2560_rx_data *data;

for (;;) {
desc = &sc->rxq.desc[sc->rxq.cur];
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 (le32toh(desc->flags) &
(RT2560_RX_BUSY | RT2560_RX_CIPHER_BUSY))
break;

data->drop = 0;

if (le32toh(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",
le32toh(desc->flags)));
data->drop = 1;
}

if (((le32toh(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);
}

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

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

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

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

ieee80211_beacon_update(ic, data->ni, &sc->sc_bo, data->m, 1);

bpf_mtap3(ic->ic_rawbpf, data->m, BPF_D_OUT);
rt2560_tx_bcn(sc, data->m, data->ni);

DPRINTFN(15, ("beacon expired\n"));

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

static 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_if;
uint32_t r;

if (!device_is_active(sc->sc_dev))
return 0;

if ((r = RAL_READ(sc, RT2560_CSR7)) == 0)
return 0; /* not for us */

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

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

softint_schedule(sc->sc_soft_ih);
return 1;
}

static void
rt2560_softintr(void *arg)
{
struct rt2560_softc *sc = arg;
struct ifnet *ifp = &sc->sc_if;
uint32_t r;

if (!device_is_active(sc->sc_dev) || !(ifp->if_flags & IFF_RUNNING))
return;

if ((r = RAL_READ(sc, RT2560_CSR7)) == 0)
goto out;

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

if (r & RT2560_BEACON_EXPIRE)
rt2560_beacon_expire(sc);

if (r & RT2560_WAKEUP_EXPIRE)
rt2560_wakeup_expire(sc);

if (r & RT2560_ENCRYPTION_DONE)
rt2560_encryption_intr(sc);

if (r & RT2560_TX_DONE)
rt2560_tx_intr(sc);

if (r & RT2560_PRIO_DONE)
rt2560_prio_intr(sc);

if (r & RT2560_DECRYPTION_DONE)
rt2560_decryption_intr(sc);

if (r & RT2560_RX_DONE)
rt2560_rx_intr(sc);

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

/* 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.
*/
static uint8_t
rt2560_rxrate(struct rt2560_rx_desc *desc)
{
if (le32toh(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 */
}

/*
* Return the expected ack rate for a frame transmitted at rate `rate'.
* XXX: this should depend on the destination node basic rate set.
*/
static 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.
*/
static uint16_t
rt2560_txtime(int len, int rate, uint32_t flags)
{
uint16_t txtime;

if (RAL_RATE_IS_OFDM(rate)) {
/* IEEE Std 802.11a-1999, pp. 37 */
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;
}

static 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;
}
}

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

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

static int
rt2560_tx_bcn(struct rt2560_softc *sc, struct mbuf *m0,
struct ieee80211_node *ni)
{
struct rt2560_tx_desc *desc;
struct rt2560_tx_data *data;
int rate, error;

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

rate = IEEE80211_IS_CHAN_5GHZ(ni->ni_chan) ? 12 : 2;

error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, m0,
BUS_DMA_NOWAIT);
if (error != 0) {
aprint_error_dev(sc->sc_dev, "could not map mbuf (error %d)\n",
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);

return 0;
}

static 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;
struct ieee80211_key *k;
uint16_t dur;
uint32_t flags = 0;
int rate, error;

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

rate = IEEE80211_IS_CHAN_5GHZ(ni->ni_chan) ? 12 : 2;

wh = mtod(m0, struct ieee80211_frame *);

if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
k = ieee80211_crypto_encap(ic, ni, m0);
if (k == NULL) {
m_freem(m0);
return ENOBUFS;
}

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

error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, m0,
BUS_DMA_NOWAIT);
if (error != 0) {
aprint_error_dev(sc->sc_dev, "could not map mbuf (error %d)\n",
error);
m_freem(m0);
return error;
}

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_mtap2(sc->sc_drvbpf, tap, sc->sc_txtap_len, m0, BPF_D_OUT);
}

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

wh = mtod(m0, struct ieee80211_frame *);

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

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

/* tell hardware to add 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;
}

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;
}

/*
* Build a RTS control frame.
*/
static struct mbuf *
rt2560_get_rts(struct rt2560_softc *sc, struct ieee80211_frame *wh,
uint16_t dur)
{
struct ieee80211_frame_rts *rts;
struct mbuf *m;

MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
sc->sc_ic.ic_stats.is_tx_nobuf++;
aprint_error_dev(sc->sc_dev, "could not allocate RTS frame\n");
return NULL;
}

rts = mtod(m, struct ieee80211_frame_rts *);

rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_CTL |
IEEE80211_FC0_SUBTYPE_RTS;
rts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
*(uint16_t *)rts->i_dur = htole16(dur);
IEEE80211_ADDR_COPY(rts->i_ra, wh->i_addr1);
IEEE80211_ADDR_COPY(rts->i_ta, wh->i_addr2);

m->m_pkthdr.len = m->m_len = sizeof (struct ieee80211_frame_rts);

return m;
}

static int
rt2560_tx_data(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 rt2560_node *rn;
struct ieee80211_rateset *rs;
struct ieee80211_frame *wh;
struct ieee80211_key *k;
struct mbuf *mnew;
uint16_t dur;
uint32_t flags = 0;
int rate, error;

wh = mtod(m0, struct ieee80211_frame *);

if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) {
rs = &ic->ic_sup_rates[ic->ic_curmode];
rate = rs->rs_rates[ic->ic_fixed_rate];
} else {
rs = &ni->ni_rates;
rn = (struct rt2560_node *)ni;
ni->ni_txrate = ieee80211_rssadapt_choose(&rn->rssadapt, rs,
wh, m0->m_pkthdr.len, -1, NULL, 0);
rate = rs->rs_rates[ni->ni_txrate];
}
rate &= IEEE80211_RATE_VAL;

if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
k = ieee80211_crypto_encap(ic, ni, m0);
if (k == NULL) {
m_freem(m0);
return ENOBUFS;
}

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

/*
* IEEE Std 802.11-1999, pp 82: "A STA shall use an RTS/CTS exchange
* for directed frames only when the length of the MPDU is greater
* than the length threshold indicated by [...]" ic_rtsthreshold.
*/
if (!IEEE80211_IS_MULTICAST(wh->i_addr1) &&
m0->m_pkthdr.len > ic->ic_rtsthreshold) {
struct mbuf *m;
int rtsrate, ackrate;

rtsrate = IEEE80211_IS_CHAN_5GHZ(ni->ni_chan) ? 12 : 2;
ackrate = rt2560_ack_rate(ic, rate);

dur = rt2560_txtime(m0->m_pkthdr.len + 4, rate, ic->ic_flags) +
rt2560_txtime(RAL_CTS_SIZE, rtsrate, ic->ic_flags) +
rt2560_txtime(RAL_ACK_SIZE, ackrate, ic->ic_flags) +
3 * RAL_SIFS;

m = rt2560_get_rts(sc, wh, dur);

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

error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, m,
BUS_DMA_NOWAIT);
if (error != 0) {
aprint_error_dev(sc->sc_dev, "could not map mbuf (error %d)\n",
error);
m_freem(m);
m_freem(m0);
return error;
}

/* avoid multiple free() of the same node for each fragment */
ieee80211_ref_node(ni);

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

/* RTS frames are not taken into account for rssadapt */
data->id.id_node = NULL;

rt2560_setup_tx_desc(sc, desc, RT2560_TX_ACK |
RT2560_TX_MORE_FRAG, m->m_pkthdr.len, rtsrate, 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, sc->txq.map,
sc->txq.cur_encrypt * RT2560_TX_DESC_SIZE,
RT2560_TX_DESC_SIZE, BUS_DMASYNC_PREWRITE);

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

/*
* IEEE Std 802.11-1999: when an RTS/CTS exchange is used, the
* asynchronous data frame shall be transmitted after the CTS
* frame and a SIFS period.
*/
flags |= RT2560_TX_LONG_RETRY | RT2560_TX_IFS_SIFS;
}

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

error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, m0,
BUS_DMA_NOWAIT);
if (error != 0 && error != EFBIG) {
aprint_error_dev(sc->sc_dev, "could not map mbuf (error %d)\n",
error);
m_freem(m0);
return error;
}
if (error != 0) {
/* too many fragments, linearize */

MGETHDR(mnew, M_DONTWAIT, MT_DATA);
if (mnew == NULL) {
m_freem(m0);
return ENOMEM;
}

m_copy_pkthdr(mnew, m0);
if (m0->m_pkthdr.len > MHLEN) {
MCLGET(mnew, M_DONTWAIT);
if (!(mnew->m_flags & M_EXT)) {
m_freem(m0);
m_freem(mnew);
return ENOMEM;
}
}

m_copydata(m0, 0, m0->m_pkthdr.len, mtod(mnew, void *));
m_freem(m0);
mnew->m_len = mnew->m_pkthdr.len;
m0 = mnew;

error = bus_dmamap_load_mbuf(sc->sc_dmat, data->map, m0,
BUS_DMA_NOWAIT);
if (error != 0) {
aprint_error_dev(sc->sc_dev, "could not map mbuf (error %d)\n",
error);
m_freem(m0);
return error;
}

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

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_mtap2(sc->sc_drvbpf, tap, sc->sc_txtap_len, m0, BPF_D_OUT);
}

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

/* remember link conditions for rate adaptation algorithm */
if (ic->ic_fixed_rate == IEEE80211_FIXED_RATE_NONE) {
data->id.id_len = m0->m_pkthdr.len;
data->id.id_rateidx = ni->ni_txrate;
data->id.id_node = ni;
data->id.id_rssi = ni->ni_rssi;
} else
data->id.id_node = NULL;

if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
flags |= RT2560_TX_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, sc->txq.map,
sc->txq.cur_encrypt * RT2560_TX_DESC_SIZE, RT2560_TX_DESC_SIZE,
BUS_DMASYNC_PREWRITE);

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

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

return 0;
}

static 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;
struct ether_header *eh;

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

for (;;) {
IF_POLL(&ic->ic_mgtq, m0);
if (m0 != NULL) {
if (sc->prioq.queued >= RT2560_PRIO_RING_COUNT) {
ifp->if_flags |= IFF_OACTIVE;
break;
}
IF_DEQUEUE(&ic->ic_mgtq, m0);
if (m0 == NULL)
break;

ni = M_GETCTX(m0, struct ieee80211_node *);
M_CLEARCTX(m0);
bpf_mtap3(ic->ic_rawbpf, m0, BPF_D_OUT);
if (rt2560_tx_mgt(sc, m0, ni) != 0)
break;

} else {
if (ic->ic_state != IEEE80211_S_RUN)
break;
IFQ_DEQUEUE(&ifp->if_snd, m0);
if (m0 == NULL)
break;
if (sc->txq.queued >= RT2560_TX_RING_COUNT - 1) {
ifp->if_flags |= IFF_OACTIVE;
break;
}

if (m0->m_len < sizeof (struct ether_header) &&
!(m0 = m_pullup(m0, sizeof (struct ether_header))))
continue;

eh = mtod(m0, struct ether_header *);
ni = ieee80211_find_txnode(ic, eh->ether_dhost);
if (ni == NULL) {
m_freem(m0);
continue;
}
bpf_mtap(ifp, m0, BPF_D_OUT);

m0 = ieee80211_encap(ic, m0, ni);
if (m0 == NULL) {
ieee80211_free_node(ni);
continue;
}

bpf_mtap3(ic->ic_rawbpf, m0, BPF_D_OUT);

if (rt2560_tx_data(sc, m0, ni) != 0) {
ieee80211_free_node(ni);
if_statinc(ifp, if_oerrors);
break;
}
}

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

static 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) {
aprint_error_dev(sc->sc_dev, "device timeout\n");
rt2560_init(ifp);
if_statinc(ifp, if_oerrors);
return;
}
ifp->if_timer = 1;
}

ieee80211_watchdog(&sc->sc_ic);
}

/*
* This function allows for fast channel switching in monitor mode (used by
* net-mgmt/kismet). In IBSS mode, we must explicitly reset the interface to
* generate a new beacon frame.
*/
static int
rt2560_reset(struct ifnet *ifp)
{
struct rt2560_softc *sc = ifp->if_softc;
struct ieee80211com *ic = &sc->sc_ic;

if (ic->ic_opmode != IEEE80211_M_MONITOR)
return ENETRESET;

rt2560_set_chan(sc, ic->ic_curchan);

return 0;
}

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

s = splnet();

switch (cmd) {
case SIOCSIFFLAGS:
if ((error = ifioctl_common(ifp, cmd, data)) != 0)
break;
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 SIOCADDMULTI:
case SIOCDELMULTI:
/* XXX no h/w multicast filter? --dyoung */
if ((error = ether_ioctl(ifp, cmd, data)) == ENETRESET)
error = 0;
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(ic, cmd, data);
if (error == ENETRESET &&
ic->ic_opmode == IEEE80211_M_MONITOR) {
rt2560_set_chan(sc, ic->ic_ibss_chan);
error = 0;
}
break;

default:
error = ieee80211_ioctl(ic, 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;
}

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

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

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

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

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

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);
}

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

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

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

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

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

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

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

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

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

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

rt2560_rf_write(sc, RT2560_RF1, rt2560_rf5222[i].r1);
rt2560_rf_write(sc, RT2560_RF2, rt2560_rf5222[i].r2);
rt2560_rf_write(sc, RT2560_RF3, power << 7 | 0x00040);
rt2560_rf_write(sc, RT2560_RF4, rt2560_rf5222[i].r4);
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.
*/
static 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.
*/
static 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);
else
tmp |= RT2560_ENABLE_TSF_SYNC(2) |
RT2560_ENABLE_BEACON_GENERATOR;
RAL_WRITE(sc, RT2560_CSR14, tmp);

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

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

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

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

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

/*
* IEEE 802.11a uses short slot time. Refer to IEEE Std 802.11-1999 pp. 85 to
* know how these values are computed.
*/
static void
rt2560_update_slot(struct ifnet *ifp)
{
struct rt2560_softc *sc = ifp->if_softc;
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) ? 9 : 20;

/* 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));
}

static 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 if (IEEE80211_IS_CHAN_5GHZ(ic->ic_bss->ni_chan)) {
/* 11a basic rates: 6, 12, 24Mbps */
RAL_WRITE(sc, RT2560_ARSP_PLCP_1, 0x150);
} else {
/* 11g basic rates: 1, 2, 5.5, 11, 6, 12, 24Mbps */
RAL_WRITE(sc, RT2560_ARSP_PLCP_1, 0x15f);
}
}

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

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

static void
rt2560_set_bssid(struct rt2560_softc *sc, 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)));
}

static 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)));
}

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

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

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

static void
rt2560_update_promisc(struct rt2560_softc *sc)
{
struct ifnet *ifp = &sc->sc_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"));
}

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

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

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

rt2560_bbp_write(sc, RT2560_BBP_TX, tx);

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

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

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

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

rt2560_bbp_write(sc, RT2560_BBP_RX, rx);
}

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

static void
rt2560_read_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;
}
}

static int
rt2560_bbp_init(struct rt2560_softc *sc)
{
#define N(a) (sizeof (a) / sizeof ((a)[0]))
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) {
aprint_error_dev(sc->sc_dev, "timeout waiting for BBP\n");
return EIO;
}

/* initialize BBP registers to default values */
for (i = 0; i < N(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;
#undef N
}

static int
rt2560_init(struct ifnet *ifp)
{
#define N(a) (sizeof (a) / sizeof ((a)[0]))
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) {
aprint_error_dev(sc->sc_dev, "could not enable device\n");
return EIO;
}
sc->sc_flags |= RT2560_ENABLED;
}

rt2560_stop(ifp, 1);

/* 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 < N(rt2560_def_mac); i++)
RAL_WRITE(sc, rt2560_def_mac[i].reg, rt2560_def_mac[i].val);

IEEE80211_ADDR_COPY(ic->ic_myaddr, CLLADDR(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_update_slot(ifp);
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;
if (ic->ic_opmode != IEEE80211_M_HOSTAP)
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_OACTIVE;
ifp->if_flags |= IFF_RUNNING;

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;
#undef N
}

static 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;
ifp->if_timer = 0;
ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);

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);
}