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sa1111_kbc.c revision 1.10
      1  1.10       ad /*      $NetBSD: sa1111_kbc.c,v 1.10 2008/01/05 00:31:55 ad Exp $ */
      2   1.1      bsh 
      3   1.1      bsh /*
      4   1.3    bjh21  * Copyright (c) 2004  Ben Harris.
      5   1.6      bsh  * Copyright (c) 2002, 2004  Genetec Corporation.  All rights reserved.
      6   1.1      bsh  * Written by Hiroyuki Bessho for Genetec Corporation.
      7   1.1      bsh  *
      8   1.1      bsh  * Redistribution and use in source and binary forms, with or without
      9   1.1      bsh  * modification, are permitted provided that the following conditions
     10   1.1      bsh  * are met:
     11   1.1      bsh  * 1. Redistributions of source code must retain the above copyright
     12   1.1      bsh  *    notice, this list of conditions and the following disclaimer.
     13   1.1      bsh  * 2. Redistributions in binary form must reproduce the above copyright
     14   1.1      bsh  *    notice, this list of conditions and the following disclaimer in the
     15   1.1      bsh  *    documentation and/or other materials provided with the distribution.
     16   1.1      bsh  * 3. The name of Genetec Corporation may not be used to endorse or
     17   1.1      bsh  *    promote products derived from this software without specific prior
     18   1.1      bsh  *    written permission.
     19   1.1      bsh  *
     20   1.1      bsh  * THIS SOFTWARE IS PROVIDED BY GENETEC CORPORATION ``AS IS'' AND
     21   1.1      bsh  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22   1.1      bsh  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23   1.1      bsh  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GENETEC CORPORATION
     24   1.1      bsh  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25   1.1      bsh  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26   1.1      bsh  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27   1.1      bsh  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28   1.1      bsh  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29   1.1      bsh  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30   1.1      bsh  * POSSIBILITY OF SUCH DAMAGE.
     31   1.1      bsh  *
     32   1.1      bsh  * Driver for keyboard controller in SA-1111 companion chip.
     33   1.1      bsh  */
     34   1.1      bsh /*
     35   1.1      bsh  * Copyright (c) 1998
     36   1.1      bsh  *	Matthias Drochner.  All rights reserved.
     37   1.1      bsh  *
     38   1.1      bsh  * Redistribution and use in source and binary forms, with or without
     39   1.1      bsh  * modification, are permitted provided that the following conditions
     40   1.1      bsh  * are met:
     41   1.1      bsh  * 1. Redistributions of source code must retain the above copyright
     42   1.1      bsh  *    notice, this list of conditions and the following disclaimer.
     43   1.1      bsh  * 2. Redistributions in binary form must reproduce the above copyright
     44   1.1      bsh  *    notice, this list of conditions and the following disclaimer in the
     45   1.1      bsh  *    documentation and/or other materials provided with the distribution.
     46   1.1      bsh  *
     47   1.1      bsh  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     48   1.1      bsh  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     49   1.1      bsh  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     50   1.1      bsh  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     51   1.1      bsh  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     52   1.1      bsh  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     53   1.1      bsh  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     54   1.1      bsh  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     55   1.1      bsh  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     56   1.1      bsh  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     57   1.1      bsh  */
     58   1.2    lukem 
     59   1.2    lukem #include <sys/cdefs.h>
     60  1.10       ad __KERNEL_RCSID(0, "$NetBSD: sa1111_kbc.c,v 1.10 2008/01/05 00:31:55 ad Exp $");
     61   1.1      bsh 
     62   1.1      bsh #include <sys/param.h>
     63   1.1      bsh #include <sys/systm.h>
     64   1.1      bsh #include <sys/types.h>
     65   1.1      bsh #include <sys/callout.h>
     66   1.1      bsh #include <sys/kernel.h>
     67   1.1      bsh #include <sys/proc.h>
     68   1.1      bsh #include <sys/conf.h>
     69   1.1      bsh #include <sys/device.h>
     70   1.1      bsh #include <sys/malloc.h>
     71   1.1      bsh #include <sys/errno.h>
     72   1.1      bsh #include <sys/queue.h>
     73  1.10       ad #include <sys/bus.h>
     74   1.1      bsh 
     75   1.1      bsh #include <arm/sa11x0/sa1111_reg.h>
     76   1.1      bsh #include <arm/sa11x0/sa1111_var.h>
     77   1.1      bsh 
     78   1.3    bjh21 #include <dev/pckbport/pckbportvar.h>		/* for prototypes */
     79   1.1      bsh 
     80   1.1      bsh #include "pckbd.h"
     81   1.1      bsh #include "rnd.h"
     82   1.1      bsh #include "locators.h"
     83   1.1      bsh 
     84   1.1      bsh struct sackbc_softc {
     85   1.1      bsh 	struct device dev;
     86   1.1      bsh 
     87   1.1      bsh 	bus_space_tag_t    iot;
     88   1.1      bsh 	bus_space_handle_t ioh;
     89   1.1      bsh 
     90   1.1      bsh 	void	*ih_rx;			/* receive interrupt */
     91   1.1      bsh 	int	intr;			/* interrupt number */
     92   1.6      bsh 	int	slot;		/* KBD_SLOT or AUX_SLOT */
     93   1.1      bsh 
     94   1.1      bsh 	int	polling;	/* don't process data in interrupt handler */
     95   1.1      bsh 	int	poll_stat;	/* data read from inr handler if polling */
     96   1.1      bsh 	int	poll_data;	/* status read from intr handler if polling */
     97   1.1      bsh 
     98   1.6      bsh #if NRND > 0
     99   1.6      bsh 	rndsource_element_t	rnd_source;
    100   1.6      bsh #endif
    101   1.3    bjh21 	pckbport_tag_t pt;
    102   1.1      bsh };
    103   1.1      bsh 
    104   1.9    peter static int	sackbc_match(struct device *, struct cfdata *, void *);
    105   1.9    peter static void	sackbc_attach(struct device *, struct device *, void *);
    106   1.3    bjh21 
    107   1.3    bjh21 static int	sackbc_xt_translation(void *, pckbport_slot_t, int);
    108   1.3    bjh21 #define sackbc_send_devcmd	sackbc_send_cmd
    109   1.3    bjh21 static int	sackbc_send_devcmd(void *, pckbport_slot_t, u_char);
    110   1.3    bjh21 static int	sackbc_poll_data1(void *, pckbport_slot_t);
    111   1.3    bjh21 static void	sackbc_slot_enable(void *, pckbport_slot_t, int);
    112   1.3    bjh21 static void	sackbc_intr_establish(void *, pckbport_slot_t);
    113   1.3    bjh21 static void	sackbc_set_poll(void *, pckbport_slot_t, int);
    114   1.1      bsh 
    115   1.1      bsh CFATTACH_DECL(sackbc, sizeof(struct sackbc_softc), sackbc_match,
    116   1.1      bsh     sackbc_attach, NULL, NULL);
    117   1.1      bsh 
    118   1.3    bjh21 static struct pckbport_accessops const sackbc_ops = {
    119   1.3    bjh21 	sackbc_xt_translation,
    120   1.3    bjh21 	sackbc_send_devcmd,
    121   1.3    bjh21 	sackbc_poll_data1,
    122   1.3    bjh21 	sackbc_slot_enable,
    123   1.3    bjh21 	sackbc_intr_establish,
    124   1.3    bjh21 	sackbc_set_poll
    125   1.3    bjh21 };
    126   1.1      bsh 
    127   1.1      bsh #define	KBD_DELAY	DELAY(8)
    128   1.1      bsh 
    129   1.1      bsh /*#define SACKBCDEBUG*/
    130   1.1      bsh 
    131   1.1      bsh #ifdef SACKBCDEBUG
    132   1.1      bsh #define DPRINTF(arg)  printf arg
    133   1.1      bsh #else
    134   1.1      bsh #define DPRINTF(arg)
    135   1.1      bsh #endif
    136   1.1      bsh 
    137   1.1      bsh 
    138   1.1      bsh static int
    139   1.1      bsh sackbc_match(struct device *parent, struct cfdata *cf, void *aux)
    140   1.1      bsh {
    141   1.1      bsh 	struct sa1111_attach_args *aa = (struct sa1111_attach_args *)aux;
    142   1.1      bsh 
    143   1.5      bsh 	switch (aa->sa_addr) {
    144   1.9    peter 	case SACC_KBD0:
    145   1.9    peter 	case SACC_KBD1:
    146   1.1      bsh 		return 1;
    147   1.1      bsh 	}
    148   1.1      bsh 	return 0;
    149   1.1      bsh }
    150   1.1      bsh 
    151   1.1      bsh #if 0
    152   1.1      bsh static int
    153   1.5      bsh sackbc_txint(void *cookie)
    154   1.1      bsh {
    155   1.1      bsh 	struct sackbc_softc *sc = cookie;
    156   1.1      bsh 
    157   1.5      bsh 	bus_space_read_4(sc->iot, sc->ioh, SACCKBD_STAT);
    158   1.1      bsh 
    159   1.1      bsh 	return 0;
    160   1.1      bsh }
    161   1.1      bsh #endif
    162   1.1      bsh 
    163   1.1      bsh static int
    164   1.5      bsh sackbc_rxint(void *cookie)
    165   1.1      bsh {
    166   1.1      bsh 	struct sackbc_softc *sc = cookie;
    167   1.9    peter 	int stat, code = -1;
    168   1.1      bsh 
    169   1.5      bsh 	stat = bus_space_read_4(sc->iot, sc->ioh, SACCKBD_STAT);
    170   1.5      bsh 	DPRINTF(("sackbc_rxint stat=%x\n", stat));
    171   1.5      bsh 	if (stat & KBDSTAT_RXF) {
    172   1.5      bsh 		code = bus_space_read_4(sc->iot, sc->ioh, SACCKBD_DATA);
    173   1.1      bsh 
    174   1.6      bsh #if NRND > 0
    175   1.6      bsh 		rnd_add_uint32(&sc->rnd_source, (stat<<8)|data);
    176   1.6      bsh #endif
    177   1.6      bsh 
    178   1.5      bsh 		if (sc->polling) {
    179   1.1      bsh 			sc->poll_data = code;
    180   1.1      bsh 			sc->poll_stat = stat;
    181   1.9    peter 		} else
    182   1.6      bsh 			pckbportintr(sc->pt, sc->slot, code);
    183   1.1      bsh 		return 1;
    184   1.1      bsh 	}
    185   1.1      bsh 
    186   1.1      bsh 	return 0;
    187   1.1      bsh }
    188   1.1      bsh 
    189   1.3    bjh21 static void
    190   1.3    bjh21 sackbc_intr_establish(void *cookie, pckbport_slot_t slot)
    191   1.1      bsh {
    192   1.3    bjh21 	struct sackbc_softc *sc = cookie;
    193   1.1      bsh 
    194   1.9    peter 	if (!(sc->polling) && sc->ih_rx == NULL) {
    195   1.5      bsh 		sc->ih_rx = sacc_intr_establish(
    196   1.8  thorpej 			(sacc_chipset_tag_t *) device_parent(&sc->dev),
    197   1.5      bsh 			sc->intr+1, IST_EDGE_RAISE, IPL_TTY, sackbc_rxint, sc);
    198   1.5      bsh 		if (sc->ih_rx == NULL) {
    199   1.5      bsh 			printf("%s: can't establish interrupt\n",
    200   1.5      bsh 			    sc->dev.dv_xname);
    201   1.1      bsh 		}
    202   1.1      bsh 	}
    203   1.1      bsh }
    204   1.1      bsh 
    205   1.1      bsh static void
    206   1.5      bsh sackbc_disable_intrhandler(struct sackbc_softc *sc)
    207   1.1      bsh {
    208   1.5      bsh 	if (sc->polling && sc->ih_rx) {
    209   1.5      bsh 		sacc_intr_disestablish(
    210   1.8  thorpej 			(sacc_chipset_tag_t *) device_parent(&sc->dev),
    211   1.5      bsh 			sc->ih_rx);
    212   1.1      bsh 		sc->ih_rx = NULL;
    213   1.1      bsh 	}
    214   1.1      bsh }
    215   1.1      bsh 
    216   1.1      bsh static	void
    217   1.1      bsh sackbc_attach(struct device *parent, struct device *self, void *aux)
    218   1.1      bsh {
    219   1.1      bsh 	struct sackbc_softc *sc = (struct sackbc_softc *)self;
    220   1.1      bsh 	struct sacc_softc *psc = (struct sacc_softc *)parent;
    221   1.1      bsh 	struct sa1111_attach_args *aa = (struct sa1111_attach_args *)aux;
    222   1.3    bjh21 	struct device *child;
    223   1.1      bsh 	uint32_t tmp, clock_bit;
    224   1.6      bsh 	int intr, slot;
    225   1.1      bsh 
    226   1.5      bsh 	switch (aa->sa_addr) {
    227   1.1      bsh 	case SACC_KBD0: clock_bit = (1<<6); intr = 21; break;
    228   1.1      bsh 	case SACC_KBD1: clock_bit = (1<<5); intr = 18; break;
    229   1.1      bsh 	default:
    230   1.1      bsh 		return;
    231   1.1      bsh 	}
    232   1.1      bsh 
    233   1.5      bsh 	if (aa->sa_size <= 0)
    234   1.1      bsh 		aa->sa_size = SACCKBD_SIZE;
    235   1.5      bsh 	if (aa->sa_intr == SACCCF_INTR_DEFAULT)
    236   1.1      bsh 		aa->sa_intr = intr;
    237   1.1      bsh 
    238   1.1      bsh 	sc->iot = psc->sc_iot;
    239   1.5      bsh 	if (bus_space_subregion(psc->sc_iot, psc->sc_ioh,
    240   1.5      bsh 	    aa->sa_addr, aa->sa_size, &sc->ioh)) {
    241   1.5      bsh 		printf(": can't map subregion\n");
    242   1.1      bsh 		return;
    243   1.1      bsh 	}
    244   1.1      bsh 
    245   1.1      bsh 	/* enable clock for PS/2 kbd or mouse */
    246   1.5      bsh 	tmp = bus_space_read_4(psc->sc_iot, psc->sc_ioh, SACCSC_SKPCR);
    247   1.5      bsh 	bus_space_write_4(psc->sc_iot, psc->sc_ioh, SACCSC_SKPCR,
    248   1.5      bsh 	    tmp | clock_bit);
    249   1.1      bsh 
    250   1.1      bsh 	sc->ih_rx = NULL;
    251   1.1      bsh 	sc->intr = aa->sa_intr;
    252   1.1      bsh 	sc->polling = 0;
    253   1.1      bsh 
    254   1.5      bsh 	tmp = bus_space_read_4(sc->iot, sc->ioh, SACCKBD_CR);
    255   1.5      bsh 	bus_space_write_4(sc->iot, sc->ioh, SACCKBD_CR, tmp | KBDCR_ENA);
    256   1.1      bsh 
    257   1.1      bsh 	/* XXX: this is necessary to get keyboard working. but I don't know why */
    258   1.5      bsh 	bus_space_write_4(sc->iot, sc->ioh, SACCKBD_CLKDIV, 2);
    259   1.1      bsh 
    260   1.5      bsh 	tmp = bus_space_read_4(sc->iot, sc->ioh, SACCKBD_STAT);
    261   1.5      bsh 	if ((tmp & KBDSTAT_ENA) == 0) {
    262   1.1      bsh 		printf("??? can't enable KBD controller\n");
    263   1.1      bsh 		return;
    264   1.1      bsh 	}
    265   1.1      bsh 
    266   1.1      bsh 	printf("\n");
    267   1.1      bsh 
    268   1.3    bjh21 	sc->pt = pckbport_attach(sc, &sackbc_ops);
    269   1.1      bsh 
    270   1.6      bsh 	/*
    271   1.9    peter 	 * Although there is no such thing as SLOT for SA-1111 kbd
    272   1.6      bsh 	 * controller, pckbd and pms drivers require it.
    273   1.6      bsh 	 */
    274   1.9    peter 	for (slot = PCKBPORT_KBD_SLOT; slot <= PCKBPORT_AUX_SLOT; ++slot) {
    275   1.6      bsh 		child = pckbport_attach_slot(self, sc->pt, slot);
    276   1.6      bsh 
    277   1.6      bsh 		if (child == NULL)
    278   1.6      bsh 			continue;
    279   1.6      bsh 		sc->slot = slot;
    280   1.6      bsh #if NRND > 0
    281   1.6      bsh 		rnd_attach_source(&sc->rnd_source, child->dv_xname,
    282   1.6      bsh 		    RND_TYPE_TTY, 0);
    283   1.1      bsh #endif
    284   1.6      bsh 		/* only one of KBD_SLOT or AUX_SLOT is used. */
    285   1.6      bsh 		break;
    286   1.6      bsh 	}
    287   1.1      bsh }
    288   1.1      bsh 
    289   1.1      bsh 
    290   1.1      bsh static inline int
    291   1.5      bsh sackbc_wait_output(struct sackbc_softc *sc)
    292   1.1      bsh {
    293   1.1      bsh 	u_int i, stat;
    294   1.1      bsh 
    295   1.1      bsh 	for (i = 100000; i; i--){
    296   1.1      bsh 		stat = bus_space_read_4(sc->iot, sc->ioh, SACCKBD_STAT);
    297   1.1      bsh 		delay(100);
    298   1.5      bsh 		if (stat & KBDSTAT_TXE)
    299   1.1      bsh 			return 1;
    300   1.1      bsh 	}
    301   1.1      bsh 	return 0;
    302   1.1      bsh }
    303   1.1      bsh 
    304   1.1      bsh static int
    305   1.5      bsh sackbc_poll_data1(void *cookie, pckbport_slot_t slot)
    306   1.1      bsh {
    307   1.3    bjh21 	struct sackbc_softc *sc = cookie;
    308   1.1      bsh 	int i, s, stat, c = -1;
    309   1.1      bsh 
    310   1.1      bsh 	s = spltty();
    311   1.1      bsh 
    312   1.1      bsh 	if (sc->polling){
    313   1.1      bsh 		stat	= sc->poll_stat;
    314   1.1      bsh 		c	= sc->poll_data;
    315   1.1      bsh 		sc->poll_data = -1;
    316   1.1      bsh 		sc->poll_stat = -1;
    317   1.5      bsh 		if (stat >= 0 &&
    318   1.5      bsh 		    (stat & (KBDSTAT_RXF|KBDSTAT_STP)) == KBDSTAT_RXF) {
    319   1.1      bsh 			splx(s);
    320   1.1      bsh 			return c;
    321   1.1      bsh 		}
    322   1.1      bsh 	}
    323   1.1      bsh 
    324   1.1      bsh 	/* if 1 port read takes 1us (?), this polls for 100ms */
    325   1.1      bsh 	for (i = 100000; i; i--) {
    326   1.1      bsh 		stat = bus_space_read_4(sc->iot, sc->ioh, SACCKBD_STAT);
    327   1.5      bsh 		if ((stat & (KBDSTAT_RXF|KBDSTAT_STP)) == KBDSTAT_RXF) {
    328   1.1      bsh 			KBD_DELAY;
    329   1.1      bsh 			c = bus_space_read_4(sc->iot, sc->ioh, SACCKBD_DATA);
    330   1.1      bsh 			break;
    331   1.1      bsh 		}
    332   1.1      bsh 	}
    333   1.1      bsh 
    334   1.1      bsh 	splx(s);
    335   1.9    peter 	return c;
    336   1.1      bsh }
    337   1.1      bsh 
    338   1.1      bsh static int
    339   1.5      bsh sackbc_send_cmd(void *cookie, pckbport_slot_t slot, u_char val)
    340   1.1      bsh {
    341   1.3    bjh21 	struct sackbc_softc *sc = cookie;
    342   1.3    bjh21 
    343   1.5      bsh 	if (!sackbc_wait_output(sc))
    344   1.9    peter 		return 0;
    345   1.5      bsh 	bus_space_write_1(sc->iot, sc->ioh, SACCKBD_DATA, val);
    346   1.9    peter 	return 1;
    347   1.1      bsh }
    348   1.1      bsh 
    349   1.1      bsh 
    350   1.1      bsh /*
    351   1.1      bsh  * Glue functions for pckbd on sackbc.
    352   1.1      bsh  * These functions emulate those in dev/ic/pckbc.c.
    353   1.1      bsh  *
    354   1.1      bsh  */
    355   1.1      bsh 
    356   1.1      bsh /*
    357   1.1      bsh  * switch scancode translation on / off
    358   1.1      bsh  * return nonzero on success
    359   1.1      bsh  */
    360   1.3    bjh21 static int
    361   1.3    bjh21 sackbc_xt_translation(void *self, pckbport_slot_t slot, int on)
    362   1.1      bsh {
    363   1.1      bsh 	/* KBD/Mouse controller doesn't have scancode translation */
    364   1.1      bsh 	return !on;
    365   1.1      bsh }
    366   1.1      bsh 
    367   1.3    bjh21 static void
    368   1.3    bjh21 sackbc_slot_enable(void *self, pckbport_slot_t slot, int on)
    369   1.1      bsh {
    370   1.1      bsh #if 0
    371   1.1      bsh 	struct sackbc_softc *sc = (struct sackbc_softc *) self;
    372   1.1      bsh 	int cmd;
    373   1.1      bsh 
    374   1.1      bsh 	cmd = on ? KBC_KBDENABLE : KBC_KBDDISABLE;
    375   1.5      bsh 	if (!sackbc_send_cmd(sc, cmd))
    376   1.1      bsh 		printf("sackbc_slot_enable(%d) failed\n", on);
    377   1.1      bsh #endif
    378   1.1      bsh }
    379   1.1      bsh 
    380   1.1      bsh 
    381   1.3    bjh21 static void
    382   1.3    bjh21 sackbc_set_poll(void *self, pckbport_slot_t slot, int on)
    383   1.1      bsh {
    384   1.1      bsh 	struct sackbc_softc *sc = (struct sackbc_softc *)self;
    385   1.1      bsh 	int s;
    386   1.1      bsh 
    387   1.1      bsh 	s = spltty();
    388   1.1      bsh 
    389   1.5      bsh 	if (sc->polling != on) {
    390   1.1      bsh 
    391   1.1      bsh 		sc->polling = on;
    392   1.1      bsh 
    393   1.5      bsh 		if (on) {
    394   1.1      bsh 			sc->poll_data = sc->poll_stat = -1;
    395   1.1      bsh 			sackbc_disable_intrhandler(sc);
    396   1.9    peter 		} else {
    397   1.1      bsh 			/*
    398   1.1      bsh 			 * If disabling polling on a device that's
    399   1.1      bsh 			 * been configured, make sure there are no
    400   1.1      bsh 			 * bytes left in the FIFO, holding up the
    401   1.1      bsh 			 * interrupt line.  Otherwise we won't get any
    402   1.1      bsh 			 * further interrupts.
    403   1.1      bsh 			 */
    404   1.1      bsh 			sackbc_rxint(sc);
    405   1.6      bsh 			sackbc_intr_establish(sc, sc->slot);
    406   1.1      bsh 		}
    407   1.1      bsh 	}
    408   1.1      bsh 	splx(s);
    409   1.1      bsh }
    410