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isp_sbus.c revision 1.73.4.4
      1 /* $NetBSD: isp_sbus.c,v 1.73.4.4 2009/09/16 13:37:57 yamt Exp $ */
      2 /*
      3  * SBus specific probe and attach routines for Qlogic ISP SCSI adapters.
      4  *
      5  * Copyright (C) 1997, 1998, 1999 National Aeronautics & Space Administration
      6  * All rights reserved.
      7  *
      8  * Additional Copyright (C) 2000-2007 by Matthew Jacob
      9  * All rights reserved.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  *
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __KERNEL_RCSID(0, "$NetBSD: isp_sbus.c,v 1.73.4.4 2009/09/16 13:37:57 yamt Exp $");
     37 
     38 #include <sys/param.h>
     39 #include <sys/systm.h>
     40 #include <sys/device.h>
     41 #include <sys/kernel.h>
     42 #include <sys/malloc.h>
     43 #include <sys/queue.h>
     44 #include <dev/ic/isp_netbsd.h>
     45 #include <sys/intr.h>
     46 #include <machine/autoconf.h>
     47 #include <dev/sbus/sbusvar.h>
     48 #include <sys/reboot.h>
     49 
     50 static void isp_sbus_reset0(ispsoftc_t *);
     51 static void isp_sbus_reset1(ispsoftc_t *);
     52 static int isp_sbus_intr(void *);
     53 static int
     54 isp_sbus_rd_isr(ispsoftc_t *, uint32_t *, uint16_t *, uint16_t *);
     55 static uint32_t isp_sbus_rd_reg(ispsoftc_t *, int);
     56 static void isp_sbus_wr_reg (ispsoftc_t *, int, uint32_t);
     57 static int isp_sbus_mbxdma(ispsoftc_t *);
     58 static int isp_sbus_dmasetup(ispsoftc_t *, XS_T *, void *);
     59 static void isp_sbus_dmateardown(ispsoftc_t *, XS_T *, uint32_t);
     60 
     61 #ifndef	ISP_DISABLE_FW
     62 #include <dev/microcode/isp/asm_sbus.h>
     63 #else
     64 #define	ISP_1000_RISC_CODE	NULL
     65 #endif
     66 
     67 static const struct ispmdvec mdvec = {
     68 	isp_sbus_rd_isr,
     69 	isp_sbus_rd_reg,
     70 	isp_sbus_wr_reg,
     71 	isp_sbus_mbxdma,
     72 	isp_sbus_dmasetup,
     73 	isp_sbus_dmateardown,
     74 	isp_sbus_reset0,
     75 	isp_sbus_reset1,
     76 	NULL,
     77 	ISP_1000_RISC_CODE,
     78 	0,
     79 	0
     80 };
     81 
     82 struct isp_sbussoftc {
     83 	ispsoftc_t	sbus_isp;
     84 	struct sbusdev	sbus_sd;
     85 	sdparam		sbus_dev;
     86 	struct scsipi_channel sbus_chan;
     87 	bus_space_tag_t	sbus_bustag;
     88 	bus_space_handle_t sbus_reg;
     89 	int		sbus_node;
     90 	int		sbus_pri;
     91 	struct ispmdvec	sbus_mdvec;
     92 	bus_dmamap_t	*sbus_dmamap;
     93 	int16_t		sbus_poff[_NREG_BLKS];
     94 };
     95 
     96 
     97 static int isp_match(device_t, cfdata_t, void *);
     98 static void isp_sbus_attach(device_t, device_t, void *);
     99 CFATTACH_DECL_NEW(isp_sbus, sizeof (struct isp_sbussoftc),
    100     isp_match, isp_sbus_attach, NULL, NULL);
    101 
    102 static int
    103 isp_match(device_t parent, cfdata_t cf, void *aux)
    104 {
    105 	int rv;
    106 	struct sbus_attach_args *sa = aux;
    107 
    108 	rv = (strcmp(cf->cf_name, sa->sa_name) == 0 ||
    109 		strcmp("PTI,ptisp", sa->sa_name) == 0 ||
    110 		strcmp("ptisp", sa->sa_name) == 0 ||
    111 		strcmp("SUNW,isp", sa->sa_name) == 0 ||
    112 		strcmp("QLGC,isp", sa->sa_name) == 0);
    113 
    114 	return (rv);
    115 }
    116 
    117 
    118 static void
    119 isp_sbus_attach(device_t parent, device_t self, void *aux)
    120 {
    121 	int freq, ispburst, sbusburst;
    122 	struct sbus_attach_args *sa = aux;
    123 	struct isp_sbussoftc *sbc = device_private(self);
    124 	struct sbus_softc *sbsc = device_private(parent);
    125 	ispsoftc_t *isp = &sbc->sbus_isp;
    126 
    127 	isp->isp_osinfo.dev = self;
    128 
    129 	printf(" for %s\n", sa->sa_name);
    130 
    131 	isp->isp_nchan = isp->isp_osinfo.adapter.adapt_nchannels = 1;
    132 
    133 	sbc->sbus_bustag = sa->sa_bustag;
    134 	if (sa->sa_nintr != 0)
    135 		sbc->sbus_pri = sa->sa_pri;
    136 	sbc->sbus_mdvec = mdvec;
    137 
    138 	if (sa->sa_npromvaddrs) {
    139 		sbus_promaddr_to_handle(sa->sa_bustag,
    140 			sa->sa_promvaddrs[0], &sbc->sbus_reg);
    141 	} else {
    142 		if (sbus_bus_map(sa->sa_bustag,	sa->sa_slot, sa->sa_offset,
    143 			sa->sa_size, 0, &sbc->sbus_reg) != 0) {
    144 			aprint_error_dev(self, "cannot map registers\n");
    145 			return;
    146 		}
    147 	}
    148 	sbc->sbus_node = sa->sa_node;
    149 
    150 	freq = prom_getpropint(sa->sa_node, "clock-frequency", 0);
    151 	if (freq) {
    152 		/*
    153 		 * Convert from HZ to MHz, rounding up.
    154 		 */
    155 		freq = (freq + 500000)/1000000;
    156 	}
    157 	sbc->sbus_mdvec.dv_clock = freq;
    158 
    159 	/*
    160 	 * Now figure out what the proper burst sizes, etc., to use.
    161 	 * Unfortunately, there is no ddi_dma_burstsizes here which
    162 	 * walks up the tree finding the limiting burst size node (if
    163 	 * any).
    164 	 */
    165 	sbusburst = sbsc->sc_burst;
    166 	if (sbusburst == 0)
    167 		sbusburst = SBUS_BURST_32 - 1;
    168 	ispburst = prom_getpropint(sa->sa_node, "burst-sizes", -1);
    169 	if (ispburst == -1) {
    170 		ispburst = sbusburst;
    171 	}
    172 	ispburst &= sbusburst;
    173 	ispburst &= ~(1 << 7);
    174 	ispburst &= ~(1 << 6);
    175 	sbc->sbus_mdvec.dv_conf1 =  0;
    176 	if (ispburst & (1 << 5)) {
    177 		sbc->sbus_mdvec.dv_conf1 = BIU_SBUS_CONF1_FIFO_32;
    178 	} else if (ispburst & (1 << 4)) {
    179 		sbc->sbus_mdvec.dv_conf1 = BIU_SBUS_CONF1_FIFO_16;
    180 	} else if (ispburst & (1 << 3)) {
    181 		sbc->sbus_mdvec.dv_conf1 =
    182 		    BIU_SBUS_CONF1_BURST8 | BIU_SBUS_CONF1_FIFO_8;
    183 	}
    184 	if (sbc->sbus_mdvec.dv_conf1) {
    185 		sbc->sbus_mdvec.dv_conf1 |= BIU_BURST_ENABLE;
    186 	}
    187 
    188 	isp->isp_mdvec = &sbc->sbus_mdvec;
    189 	isp->isp_bustype = ISP_BT_SBUS;
    190 	isp->isp_type = ISP_HA_SCSI_UNKNOWN;
    191 	isp->isp_param = &sbc->sbus_dev;
    192 	isp->isp_dmatag = sa->sa_dmatag;
    193 	ISP_MEMZERO(isp->isp_param, sizeof (sdparam));
    194 	isp->isp_osinfo.chan = &sbc->sbus_chan;
    195 
    196 	sbc->sbus_poff[BIU_BLOCK >> _BLK_REG_SHFT] = BIU_REGS_OFF;
    197 	sbc->sbus_poff[MBOX_BLOCK >> _BLK_REG_SHFT] = SBUS_MBOX_REGS_OFF;
    198 	sbc->sbus_poff[SXP_BLOCK >> _BLK_REG_SHFT] = SBUS_SXP_REGS_OFF;
    199 	sbc->sbus_poff[RISC_BLOCK >> _BLK_REG_SHFT] = SBUS_RISC_REGS_OFF;
    200 	sbc->sbus_poff[DMA_BLOCK >> _BLK_REG_SHFT] = DMA_REGS_OFF;
    201 
    202 	/* Establish interrupt channel */
    203 	bus_intr_establish(sbc->sbus_bustag, sbc->sbus_pri, IPL_BIO,
    204 	    isp_sbus_intr, sbc);
    205 	sbus_establish(&sbc->sbus_sd, self);
    206 
    207 	/*
    208 	 * Set up logging levels.
    209 	 */
    210 #ifdef	ISP_LOGDEFAULT
    211 	isp->isp_dblev = ISP_LOGDEFAULT;
    212 #else
    213 	isp->isp_dblev = ISP_LOGWARN|ISP_LOGERR;
    214 	if (bootverbose)
    215 		isp->isp_dblev |= ISP_LOGCONFIG|ISP_LOGINFO;
    216 #ifdef	SCSIDEBUG
    217 	isp->isp_dblev |= ISP_LOGDEBUG1|ISP_LOGDEBUG2;
    218 #endif
    219 #ifdef	DEBUG
    220 	isp->isp_dblev |= ISP_LOGDEBUG0;
    221 #endif
    222 #endif
    223 
    224 	isp->isp_confopts = device_cfdata(self)->cf_flags;
    225 	SDPARAM(isp, 0)->role = ISP_DEFAULT_ROLES;
    226 
    227 	/*
    228 	 * There's no tool on sparc to set NVRAM for ISPs, so ignore it.
    229 	 */
    230 	isp->isp_confopts |= ISP_CFG_NONVRAM;
    231 
    232 	/*
    233 	 * Mark things if we're a PTI SBus adapter.
    234 	 */
    235 	if (strcmp("PTI,ptisp", sa->sa_name) == 0 ||
    236 	    strcmp("ptisp", sa->sa_name) == 0) {
    237 		SDPARAM(isp, 0)->isp_ptisp = 1;
    238 	}
    239 	ISP_LOCK(isp);
    240 	isp_reset(isp, 1);
    241 	if (isp->isp_state != ISP_RESETSTATE) {
    242 		ISP_UNLOCK(isp);
    243 		return;
    244 	}
    245 	ISP_ENABLE_INTS(isp);
    246 	isp_init(isp);
    247 	if (isp->isp_state != ISP_INITSTATE) {
    248 		isp_uninit(isp);
    249 		ISP_UNLOCK(isp);
    250 		return;
    251 	}
    252 
    253 	/*
    254 	 * do generic attach.
    255 	 */
    256 	ISP_UNLOCK(isp);
    257 	isp_attach(isp);
    258 }
    259 
    260 
    261 static void
    262 isp_sbus_reset0(ispsoftc_t *isp)
    263 {
    264 	ISP_DISABLE_INTS(isp);
    265 }
    266 
    267 static void
    268 isp_sbus_reset1(ispsoftc_t *isp)
    269 {
    270 	ISP_ENABLE_INTS(isp);
    271 }
    272 
    273 static int
    274 isp_sbus_intr(void *arg)
    275 {
    276 	uint32_t isr;
    277 	uint16_t sema, mbox;
    278 	ispsoftc_t *isp = arg;
    279 
    280 	if (ISP_READ_ISR(isp, &isr, &sema, &mbox) == 0) {
    281 		isp->isp_intbogus++;
    282 		return (0);
    283 	} else {
    284 		struct isp_sbussoftc *sbc = arg;
    285 		sbc->sbus_isp.isp_osinfo.onintstack = 1;
    286 		isp_intr(isp, isr, sema, mbox);
    287 		sbc->sbus_isp.isp_osinfo.onintstack = 0;
    288 		return (1);
    289 	}
    290 }
    291 
    292 #define	IspVirt2Off(a, x)	\
    293 	(((struct isp_sbussoftc *)a)->sbus_poff[((x) & _BLK_REG_MASK) >> \
    294 	_BLK_REG_SHFT] + ((x) & 0xff))
    295 
    296 #define	BXR2(sbc, off)		\
    297 	bus_space_read_2(sbc->sbus_bustag, sbc->sbus_reg, off)
    298 
    299 static int
    300 isp_sbus_rd_isr(ispsoftc_t *isp, uint32_t *isrp,
    301     uint16_t *semap, uint16_t *mbp)
    302 {
    303 	struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
    304 	uint32_t isr;
    305 	uint16_t sema;
    306 
    307 	isr = BXR2(sbc, IspVirt2Off(isp, BIU_ISR));
    308 	sema = BXR2(sbc, IspVirt2Off(isp, BIU_SEMA));
    309 	isp_prt(isp, ISP_LOGDEBUG3, "ISR 0x%x SEMA 0x%x", isr, sema);
    310 	isr &= INT_PENDING_MASK(isp);
    311 	sema &= BIU_SEMA_LOCK;
    312 	if (isr == 0 && sema == 0) {
    313 		return (0);
    314 	}
    315 	*isrp = isr;
    316 	if ((*semap = sema) != 0) {
    317 		*mbp = BXR2(sbc, IspVirt2Off(isp, OUTMAILBOX0));
    318 	}
    319 	return (1);
    320 }
    321 
    322 static uint32_t
    323 isp_sbus_rd_reg(ispsoftc_t *isp, int regoff)
    324 {
    325 	struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
    326 	int offset = sbc->sbus_poff[(regoff & _BLK_REG_MASK) >> _BLK_REG_SHFT];
    327 	offset += (regoff & 0xff);
    328 	return (bus_space_read_2(sbc->sbus_bustag, sbc->sbus_reg, offset));
    329 }
    330 
    331 static void
    332 isp_sbus_wr_reg(ispsoftc_t *isp, int regoff, uint32_t val)
    333 {
    334 	struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
    335 	int offset = sbc->sbus_poff[(regoff & _BLK_REG_MASK) >> _BLK_REG_SHFT];
    336 	offset += (regoff & 0xff);
    337 	bus_space_write_2(sbc->sbus_bustag, sbc->sbus_reg, offset, val);
    338 }
    339 
    340 static int
    341 isp_sbus_mbxdma(ispsoftc_t *isp)
    342 {
    343 	struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
    344 	bus_dma_segment_t reqseg, rspseg;
    345 	int reqrs, rsprs, i, progress;
    346 	size_t n;
    347 	bus_size_t len;
    348 
    349 	if (isp->isp_rquest_dma)
    350 		return (0);
    351 
    352 	n = isp->isp_maxcmds * sizeof (XS_T *);
    353 	isp->isp_xflist = (XS_T **) malloc(n, M_DEVBUF, M_WAITOK);
    354 	if (isp->isp_xflist == NULL) {
    355 		isp_prt(isp, ISP_LOGERR, "cannot alloc xflist array");
    356 		return (1);
    357 	}
    358 	ISP_MEMZERO(isp->isp_xflist, n);
    359 	n = sizeof (bus_dmamap_t) * isp->isp_maxcmds;
    360 	sbc->sbus_dmamap = (bus_dmamap_t *) malloc(n, M_DEVBUF, M_WAITOK);
    361 	if (sbc->sbus_dmamap == NULL) {
    362 		free(isp->isp_xflist, M_DEVBUF);
    363 		isp->isp_xflist = NULL;
    364 		isp_prt(isp, ISP_LOGERR, "cannot alloc dmamap array");
    365 		return (1);
    366 	}
    367 	for (i = 0; i < isp->isp_maxcmds; i++) {
    368 		/* Allocate a DMA handle */
    369 		if (bus_dmamap_create(isp->isp_dmatag, MAXPHYS, 1, MAXPHYS,
    370 		    1 << 24, BUS_DMA_NOWAIT, &sbc->sbus_dmamap[i]) != 0) {
    371 			isp_prt(isp, ISP_LOGERR, "cmd DMA maps create error");
    372 			break;
    373 		}
    374 	}
    375 	if (i < isp->isp_maxcmds) {
    376 		while (--i >= 0) {
    377 			bus_dmamap_destroy(isp->isp_dmatag,
    378 			    sbc->sbus_dmamap[i]);
    379 		}
    380 		free(isp->isp_xflist, M_DEVBUF);
    381 		free(sbc->sbus_dmamap, M_DEVBUF);
    382 		isp->isp_xflist = NULL;
    383 		sbc->sbus_dmamap = NULL;
    384 		return (1);
    385 	}
    386 
    387 	/*
    388 	 * Allocate and map the request and response queues
    389 	 */
    390 	progress = 0;
    391 	len = ISP_QUEUE_SIZE(RQUEST_QUEUE_LEN(isp));
    392 	if (bus_dmamem_alloc(isp->isp_dmatag, len, 0, 0, &reqseg, 1, &reqrs,
    393 	    BUS_DMA_NOWAIT)) {
    394 		goto dmafail;
    395 	}
    396 	progress++;
    397 	if (bus_dmamem_map(isp->isp_dmatag, &reqseg, reqrs, len,
    398 	    (void *)&isp->isp_rquest, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) {
    399 		goto dmafail;
    400 	}
    401 	progress++;
    402 	if (bus_dmamap_create(isp->isp_dmatag, len, 1, len, 1 << 24,
    403 	    BUS_DMA_NOWAIT, &isp->isp_rqdmap) != 0) {
    404 		goto dmafail;
    405 	}
    406 	progress++;
    407 	if (bus_dmamap_load(isp->isp_dmatag, isp->isp_rqdmap,
    408 	    isp->isp_rquest, len, NULL, BUS_DMA_NOWAIT) != 0) {
    409 		goto dmafail;
    410 	}
    411 	progress++;
    412 	isp->isp_rquest_dma = isp->isp_rqdmap->dm_segs[0].ds_addr;
    413 
    414 	len = ISP_QUEUE_SIZE(RESULT_QUEUE_LEN(isp));
    415 	if (bus_dmamem_alloc(isp->isp_dmatag, len, 0, 0, &rspseg, 1, &rsprs,
    416 	    BUS_DMA_NOWAIT)) {
    417 		goto dmafail;
    418 	}
    419 	progress++;
    420 	if (bus_dmamem_map(isp->isp_dmatag, &rspseg, rsprs, len,
    421 	    (void *)&isp->isp_result, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) {
    422 		goto dmafail;
    423 	}
    424 	progress++;
    425 	if (bus_dmamap_create(isp->isp_dmatag, len, 1, len, 1 << 24,
    426 	    BUS_DMA_NOWAIT, &isp->isp_rsdmap) != 0) {
    427 		goto dmafail;
    428 	}
    429 	progress++;
    430 	if (bus_dmamap_load(isp->isp_dmatag, isp->isp_rsdmap,
    431 	    isp->isp_result, len, NULL, BUS_DMA_NOWAIT) != 0) {
    432 		goto dmafail;
    433 	}
    434 	isp->isp_result_dma = isp->isp_rsdmap->dm_segs[0].ds_addr;
    435 
    436 	return (0);
    437 
    438 dmafail:
    439 	isp_prt(isp, ISP_LOGERR, "Mailbox DMA Setup Failure");
    440 
    441 	if (progress >= 8) {
    442 		bus_dmamap_unload(isp->isp_dmatag, isp->isp_rsdmap);
    443 	}
    444 	if (progress >= 7) {
    445 		bus_dmamap_destroy(isp->isp_dmatag, isp->isp_rsdmap);
    446 	}
    447 	if (progress >= 6) {
    448 		bus_dmamem_unmap(isp->isp_dmatag,
    449 		    isp->isp_result, ISP_QUEUE_SIZE(RESULT_QUEUE_LEN(isp)));
    450 	}
    451 	if (progress >= 5) {
    452 		bus_dmamem_free(isp->isp_dmatag, &rspseg, rsprs);
    453 	}
    454 
    455 	if (progress >= 4) {
    456 		bus_dmamap_unload(isp->isp_dmatag, isp->isp_rqdmap);
    457 	}
    458 	if (progress >= 3) {
    459 		bus_dmamap_destroy(isp->isp_dmatag, isp->isp_rqdmap);
    460 	}
    461 	if (progress >= 2) {
    462 		bus_dmamem_unmap(isp->isp_dmatag,
    463 		    isp->isp_rquest, ISP_QUEUE_SIZE(RQUEST_QUEUE_LEN(isp)));
    464 	}
    465 	if (progress >= 1) {
    466 		bus_dmamem_free(isp->isp_dmatag, &reqseg, reqrs);
    467 	}
    468 
    469 	for (i = 0; i < isp->isp_maxcmds; i++) {
    470 		bus_dmamap_destroy(isp->isp_dmatag, sbc->sbus_dmamap[i]);
    471 	}
    472 	free(sbc->sbus_dmamap, M_DEVBUF);
    473 	free(isp->isp_xflist, M_DEVBUF);
    474 	isp->isp_xflist = NULL;
    475 	sbc->sbus_dmamap = NULL;
    476 	return (1);
    477 }
    478 
    479 /*
    480  * Map a DMA request.
    481  * We're guaranteed that rq->req_handle is a value from 1 to isp->isp_maxcmds.
    482  */
    483 
    484 static int
    485 isp_sbus_dmasetup(struct ispsoftc *isp, struct scsipi_xfer *xs, void *arg)
    486 {
    487 	struct isp_sbussoftc *sbc = (struct isp_sbussoftc *)isp;
    488 	ispreq_t *rq = arg;
    489 	bus_dmamap_t dmap;
    490 	bus_dma_segment_t *dm_segs;
    491 	uint32_t nsegs;
    492 	isp_ddir_t ddir;
    493 
    494 	dmap = sbc->sbus_dmamap[isp_handle_index(rq->req_handle)];
    495 	if (xs->datalen == 0) {
    496 		ddir = ISP_NOXFR;
    497 		nsegs = 0;
    498 		dm_segs = NULL;
    499 	 } else {
    500 		int error;
    501 		uint32_t flag, flg2;
    502 
    503 		if (xs->xs_control & XS_CTL_DATA_IN) {
    504 			flg2 = BUS_DMASYNC_PREREAD;
    505 			flag = BUS_DMA_READ;
    506 			ddir = ISP_FROM_DEVICE;
    507 		} else {
    508 			flg2 = BUS_DMASYNC_PREWRITE;
    509 			flag = BUS_DMA_WRITE;
    510 			ddir = ISP_TO_DEVICE;
    511 		}
    512 		error = bus_dmamap_load(isp->isp_dmatag, dmap, xs->data, xs->datalen,
    513 		    NULL, ((xs->xs_control & XS_CTL_NOSLEEP) ? BUS_DMA_NOWAIT : BUS_DMA_WAITOK) | BUS_DMA_STREAMING | flag);
    514 		if (error) {
    515 			isp_prt(isp, ISP_LOGWARN, "unable to load DMA (%d)", error);
    516 			XS_SETERR(xs, HBA_BOTCH);
    517 			if (error == EAGAIN || error == ENOMEM) {
    518 				return (CMD_EAGAIN);
    519 			} else {
    520 				return (CMD_COMPLETE);
    521 			}
    522 		}
    523 		dm_segs = dmap->dm_segs;
    524 		nsegs = dmap->dm_nsegs;
    525 		bus_dmamap_sync(isp->isp_dmatag, dmap, 0, dmap->dm_mapsize, flg2);
    526 	}
    527 
    528 	if (isp_send_cmd(isp, rq, dm_segs, nsegs, xs->datalen, ddir) != CMD_QUEUED) {
    529 		return (CMD_EAGAIN);
    530 	} else {
    531 		return (CMD_QUEUED);
    532 	}
    533 }
    534 
    535 static void
    536 isp_sbus_dmateardown(ispsoftc_t *isp, XS_T *xs, uint32_t handle)
    537 {
    538 	struct isp_sbussoftc *sbc = (struct isp_sbussoftc *) isp;
    539 	bus_dmamap_t dmap;
    540 
    541 	dmap = sbc->sbus_dmamap[isp_handle_index(handle)];
    542 
    543 	if (dmap->dm_nsegs == 0) {
    544 		panic("%s: DMA map not already allocated",
    545 		    device_xname(isp->isp_osinfo.dev));
    546 		/* NOTREACHED */
    547 	}
    548 	bus_dmamap_sync(isp->isp_dmatag, dmap, 0,
    549 	    xs->datalen, (xs->xs_control & XS_CTL_DATA_IN)?
    550 	    BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
    551 	bus_dmamap_unload(isp->isp_dmatag, dmap);
    552 }
    553