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Annotation of Net2/arch/hp300/dev/dma.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)dma.c       7.5 (Berkeley) 5/4/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * DMA driver
        !            38:  */
        !            39: 
        !            40: #include "param.h"
        !            41: #include "systm.h"
        !            42: #include "time.h"
        !            43: #include "kernel.h"
        !            44: #include "proc.h"
        !            45: 
        !            46: #include "dmareg.h"
        !            47: #include "dmavar.h"
        !            48: #include "device.h"
        !            49: 
        !            50: #include "../include/cpu.h"
        !            51: #include "../hp300/isr.h"
        !            52: 
        !            53: extern void isrlink();
        !            54: extern void _insque();
        !            55: extern void _remque();
        !            56: extern void timeout();
        !            57: extern u_int kvtop();
        !            58: extern void PCIA();
        !            59: 
        !            60: /*
        !            61:  * The largest single request will be MAXPHYS bytes which will require
        !            62:  * at most MAXPHYS/NBPG+1 chain elements to describe, i.e. if none of
        !            63:  * the buffer pages are physically contiguous (MAXPHYS/NBPG) and the
        !            64:  * buffer is not page aligned (+1).
        !            65:  */
        !            66: #define        DMAMAXIO        (MAXPHYS/NBPG+1)
        !            67: 
        !            68: struct dma_chain {
        !            69:        int     dc_count;
        !            70:        char    *dc_addr;
        !            71: };
        !            72: 
        !            73: struct dma_softc {
        !            74:        struct  dmadevice *sc_hwaddr;
        !            75:        struct  dmaBdevice *sc_Bhwaddr;
        !            76:        char    sc_type;
        !            77:        char    sc_flags;
        !            78:        u_short sc_cmd;
        !            79:        struct  dma_chain *sc_cur;
        !            80:        struct  dma_chain *sc_last;
        !            81:        struct  dma_chain sc_chain[DMAMAXIO];
        !            82: } dma_softc[NDMA];
        !            83: 
        !            84: /* types */
        !            85: #define        DMA_B   0
        !            86: #define DMA_C  1
        !            87: 
        !            88: /* flags */
        !            89: #define DMAF_PCFLUSH   0x01
        !            90: #define DMAF_VCFLUSH   0x02
        !            91: #define DMAF_NOINTR    0x04
        !            92: 
        !            93: struct devqueue dmachan[NDMA + 1];
        !            94: int    dmaintr();
        !            95: 
        !            96: #ifdef DEBUG
        !            97: int    dmadebug = 0;
        !            98: #define DDB_WORD       0x01    /* same as DMAGO_WORD */
        !            99: #define DDB_LWORD      0x02    /* same as DMAGO_LWORD */
        !           100: #define        DDB_FOLLOW      0x04
        !           101: #define DDB_IO         0x08
        !           102: 
        !           103: void   dmatimeout();
        !           104: int    dmatimo[NDMA];
        !           105: 
        !           106: long   dmahits[NDMA];
        !           107: long   dmamisses[NDMA];
        !           108: long   dmabyte[NDMA];
        !           109: long   dmaword[NDMA];
        !           110: long   dmalword[NDMA];
        !           111: #endif
        !           112: 
        !           113: void
        !           114: dmainit()
        !           115: {
        !           116:        register struct dmareg *dma = (struct dmareg *)DMA_BASE;
        !           117:        register struct dma_softc *dc;
        !           118:        register int i;
        !           119:        char rev;
        !           120: 
        !           121:        /*
        !           122:         * Determine the DMA type.
        !           123:         * Don't know how to easily differentiate the A and B cards,
        !           124:         * so we just hope nobody has an A card (A cards will work if
        !           125:         * DMAINTLVL is set to 3).
        !           126:         */
        !           127:        if (!badbaddr((char *)&dma->dma_id[2]))
        !           128:                rev = dma->dma_id[2];
        !           129:        else {
        !           130:                rev = 'B';
        !           131: #if !defined(HP320)
        !           132:                panic("dmainit: DMA card requires hp320 support");
        !           133: #endif
        !           134:        }
        !           135: 
        !           136:        dc = &dma_softc[0];
        !           137:        for (i = 0; i < NDMA; i++) {
        !           138:                dc->sc_hwaddr = (i & 1) ? &dma->dma_chan1 : &dma->dma_chan0;
        !           139:                dc->sc_Bhwaddr = (i & 1) ? &dma->dma_Bchan1 : &dma->dma_Bchan0;
        !           140:                dc->sc_type = rev == 'B' ? DMA_B : DMA_C;
        !           141:                dc++;
        !           142:                dmachan[i].dq_forw = dmachan[i].dq_back = &dmachan[i];
        !           143:        }
        !           144:        dmachan[i].dq_forw = dmachan[i].dq_back = &dmachan[i];
        !           145: #ifdef DEBUG
        !           146:        /* make sure timeout is really not needed */
        !           147:        timeout(dmatimeout, 0, 30 * hz);
        !           148: #endif
        !           149: 
        !           150:        printf("dma: 98620%c with 2 channels, %d bit DMA\n",
        !           151:               rev, rev == 'B' ? 16 : 32);
        !           152: }
        !           153: 
        !           154: int
        !           155: dmareq(dq)
        !           156:        register struct devqueue *dq;
        !           157: {
        !           158:        register int i;
        !           159:        register int chan;
        !           160:        register int s = splbio();
        !           161: 
        !           162:        chan = dq->dq_ctlr;
        !           163:        i = NDMA;
        !           164:        while (--i >= 0) {
        !           165:                if ((chan & (1 << i)) == 0)
        !           166:                        continue;
        !           167:                if (dmachan[i].dq_forw != &dmachan[i])
        !           168:                        continue;
        !           169:                insque(dq, &dmachan[i]);
        !           170:                dq->dq_ctlr = i;
        !           171:                splx(s);
        !           172:                return(1);
        !           173:        }
        !           174:        insque(dq, dmachan[NDMA].dq_back);
        !           175:        splx(s);
        !           176:        return(0);
        !           177: }
        !           178: 
        !           179: void
        !           180: dmafree(dq)
        !           181:        register struct devqueue *dq;
        !           182: {
        !           183:        int unit = dq->dq_ctlr;
        !           184:        register struct dma_softc *dc = &dma_softc[unit];
        !           185:        register struct devqueue *dn;
        !           186:        register int chan, s;
        !           187: 
        !           188:        s = splbio();
        !           189: #ifdef DEBUG
        !           190:        dmatimo[unit] = 0;
        !           191: #endif
        !           192:        DMA_CLEAR(dc);
        !           193:        /*
        !           194:         * XXX we may not always go thru the flush code in dmastop()
        !           195:         */
        !           196: #if defined(HP360) || defined(HP370)
        !           197:        if (dc->sc_flags & DMAF_PCFLUSH) {
        !           198:                PCIA();
        !           199:                dc->sc_flags &= ~DMAF_PCFLUSH;
        !           200:        }
        !           201: #endif
        !           202: #if defined(HP320) || defined(HP350)
        !           203:        if (dc->sc_flags & DMAF_VCFLUSH) {
        !           204:                /*
        !           205:                 * 320/350s have VACs that may also need flushing.
        !           206:                 * In our case we only flush the supervisor side
        !           207:                 * because we know that if we are DMAing to user
        !           208:                 * space, the physical pages will also be mapped
        !           209:                 * in kernel space (via vmapbuf) and hence cache-
        !           210:                 * inhibited by the pmap module due to the multiple
        !           211:                 * mapping.
        !           212:                 */
        !           213:                DCIS();
        !           214:                dc->sc_flags &= ~DMAF_VCFLUSH;
        !           215:        }
        !           216: #endif
        !           217:        remque(dq);
        !           218:        chan = 1 << unit;
        !           219:        for (dn = dmachan[NDMA].dq_forw;
        !           220:             dn != &dmachan[NDMA]; dn = dn->dq_forw) {
        !           221:                if (dn->dq_ctlr & chan) {
        !           222:                        remque((caddr_t)dn);
        !           223:                        insque((caddr_t)dn, (caddr_t)dq->dq_back);
        !           224:                        splx(s);
        !           225:                        dn->dq_ctlr = dq->dq_ctlr;
        !           226:                        (dn->dq_driver->d_start)(dn->dq_unit);
        !           227:                        return;
        !           228:                }
        !           229:        }
        !           230:        splx(s);
        !           231: }
        !           232: 
        !           233: void
        !           234: dmago(unit, addr, count, flags)
        !           235:        int unit;
        !           236:        register char *addr;
        !           237:        register int count;
        !           238:        register int flags;
        !           239: {
        !           240:        register struct dma_softc *dc = &dma_softc[unit];
        !           241:        register struct dma_chain *dcp;
        !           242:        register char *dmaend = NULL;
        !           243:        register int tcount;
        !           244: 
        !           245:        if (count > MAXPHYS)
        !           246:                panic("dmago: count > MAXPHYS");
        !           247: #if defined(HP320)
        !           248:        if (dc->sc_type == DMA_B && (flags & DMAGO_LWORD))
        !           249:                panic("dmago: no can do 32-bit DMA");
        !           250: #endif
        !           251: #ifdef DEBUG
        !           252:        if (dmadebug & DDB_FOLLOW)
        !           253:                printf("dmago(%d, %x, %x, %x)\n",
        !           254:                       unit, addr, count, flags);
        !           255:        if (flags & DMAGO_LWORD)
        !           256:                dmalword[unit]++;
        !           257:        else if (flags & DMAGO_WORD)
        !           258:                dmaword[unit]++;
        !           259:        else
        !           260:                dmabyte[unit]++;
        !           261: #endif
        !           262:        /*
        !           263:         * Build the DMA chain
        !           264:         */
        !           265:        for (dcp = dc->sc_chain; count > 0; dcp++) {
        !           266:                dcp->dc_addr = (char *) kvtop(addr);
        !           267:                if (count < (tcount = NBPG - ((int)addr & PGOFSET)))
        !           268:                        tcount = count;
        !           269:                dcp->dc_count = tcount;
        !           270:                addr += tcount;
        !           271:                count -= tcount;
        !           272:                if (flags & DMAGO_LWORD)
        !           273:                        tcount >>= 2;
        !           274:                else if (flags & DMAGO_WORD)
        !           275:                        tcount >>= 1;
        !           276:                if (dcp->dc_addr == dmaend
        !           277: #if defined(HP320)
        !           278:                    /* only 16-bit count on 98620B */
        !           279:                    && (dc->sc_type != DMA_B ||
        !           280:                        (dcp-1)->dc_count + tcount <= 65536)
        !           281: #endif
        !           282:                ) {
        !           283: #ifdef DEBUG
        !           284:                        dmahits[unit]++;
        !           285: #endif
        !           286:                        dmaend += dcp->dc_count;
        !           287:                        (--dcp)->dc_count += tcount;
        !           288:                } else {
        !           289: #ifdef DEBUG
        !           290:                        dmamisses[unit]++;
        !           291: #endif
        !           292:                        dmaend = dcp->dc_addr + dcp->dc_count;
        !           293:                        dcp->dc_count = tcount;
        !           294:                }
        !           295:        }
        !           296:        dc->sc_cur = dc->sc_chain;
        !           297:        dc->sc_last = --dcp;
        !           298:        dc->sc_flags = 0;
        !           299:        /*
        !           300:         * Set up the command word based on flags
        !           301:         */
        !           302:        dc->sc_cmd = DMA_ENAB | DMA_IPL(DMAINTLVL) | DMA_START;
        !           303:        if ((flags & DMAGO_READ) == 0)
        !           304:                dc->sc_cmd |= DMA_WRT;
        !           305:        if (flags & DMAGO_LWORD)
        !           306:                dc->sc_cmd |= DMA_LWORD;
        !           307:        else if (flags & DMAGO_WORD)
        !           308:                dc->sc_cmd |= DMA_WORD;
        !           309:        if (flags & DMAGO_PRI)
        !           310:                dc->sc_cmd |= DMA_PRI;
        !           311: #if defined(HP360) || defined(HP370)
        !           312:        /*
        !           313:         * Remember if we need to flush external physical cache when
        !           314:         * DMA is done.  We only do this if we are reading (writing memory).
        !           315:         */
        !           316:        if (ectype == EC_PHYS && (flags & DMAGO_READ))
        !           317:                dc->sc_flags |= DMAF_PCFLUSH;
        !           318: #endif
        !           319: #if defined(HP320) || defined(HP350)
        !           320:        if (ectype == EC_VIRT && (flags & DMAGO_READ))
        !           321:                dc->sc_flags |= DMAF_VCFLUSH;
        !           322: #endif
        !           323:        /*
        !           324:         * Remember if we can skip the dma completion interrupt on
        !           325:         * the last segment in the chain.
        !           326:         */
        !           327:        if (flags & DMAGO_NOINT) {
        !           328:                if (dc->sc_cur == dc->sc_last)
        !           329:                        dc->sc_cmd &= ~DMA_ENAB;
        !           330:                else
        !           331:                        dc->sc_flags |= DMAF_NOINTR;
        !           332:        }
        !           333: #ifdef DEBUG
        !           334:        if (dmadebug & DDB_IO)
        !           335:                if ((dmadebug&DDB_WORD) && (dc->sc_cmd&DMA_WORD) ||
        !           336:                    (dmadebug&DDB_LWORD) && (dc->sc_cmd&DMA_LWORD)) {
        !           337:                        printf("dmago: cmd %x, flags %x\n",
        !           338:                               dc->sc_cmd, dc->sc_flags);
        !           339:                        for (dcp = dc->sc_chain; dcp <= dc->sc_last; dcp++)
        !           340:                                printf("  %d: %d@%x\n", dcp-dc->sc_chain,
        !           341:                                       dcp->dc_count, dcp->dc_addr);
        !           342:                }
        !           343:        dmatimo[unit] = 1;
        !           344: #endif
        !           345:        DMA_ARM(dc);
        !           346: }
        !           347: 
        !           348: void
        !           349: dmastop(unit)
        !           350:        register int unit;
        !           351: {
        !           352:        register struct dma_softc *dc = &dma_softc[unit];
        !           353:        register struct devqueue *dq;
        !           354: 
        !           355: #ifdef DEBUG
        !           356:        if (dmadebug & DDB_FOLLOW)
        !           357:                printf("dmastop(%d)\n", unit);
        !           358:        dmatimo[unit] = 0;
        !           359: #endif
        !           360:        DMA_CLEAR(dc);
        !           361: #if defined(HP360) || defined(HP370)
        !           362:        if (dc->sc_flags & DMAF_PCFLUSH) {
        !           363:                PCIA();
        !           364:                dc->sc_flags &= ~DMAF_PCFLUSH;
        !           365:        }
        !           366: #endif
        !           367: #if defined(HP320) || defined(HP350)
        !           368:        if (dc->sc_flags & DMAF_VCFLUSH) {
        !           369:                /*
        !           370:                 * 320/350s have VACs that may also need flushing.
        !           371:                 * In our case we only flush the supervisor side
        !           372:                 * because we know that if we are DMAing to user
        !           373:                 * space, the physical pages will also be mapped
        !           374:                 * in kernel space (via vmapbuf) and hence cache-
        !           375:                 * inhibited by the pmap module due to the multiple
        !           376:                 * mapping.
        !           377:                 */
        !           378:                DCIS();
        !           379:                dc->sc_flags &= ~DMAF_VCFLUSH;
        !           380:        }
        !           381: #endif
        !           382:        /*
        !           383:         * We may get this interrupt after a device service routine
        !           384:         * has freed the dma channel.  So, ignore the intr if there's
        !           385:         * nothing on the queue.
        !           386:         */
        !           387:        dq = dmachan[unit].dq_forw;
        !           388:        if (dq != &dmachan[unit])
        !           389:                (dq->dq_driver->d_done)(dq->dq_unit);
        !           390: }
        !           391: 
        !           392: int
        !           393: dmaintr()
        !           394: {
        !           395:        register struct dma_softc *dc;
        !           396:        register int i, stat;
        !           397:        int found = 0;
        !           398: 
        !           399: #ifdef DEBUG
        !           400:        if (dmadebug & DDB_FOLLOW)
        !           401:                printf("dmaintr\n");
        !           402: #endif
        !           403:        for (i = 0, dc = dma_softc; i < NDMA; i++, dc++) {
        !           404:                stat = DMA_STAT(dc);
        !           405:                if ((stat & DMA_INTR) == 0)
        !           406:                        continue;
        !           407:                found++;
        !           408: #ifdef DEBUG
        !           409:                if (dmadebug & DDB_IO) {
        !           410:                        if ((dmadebug&DDB_WORD) && (dc->sc_cmd&DMA_WORD) ||
        !           411:                            (dmadebug&DDB_LWORD) && (dc->sc_cmd&DMA_LWORD))
        !           412:                                printf("dmaintr: unit %d stat %x next %d\n",
        !           413:                                       i, stat, (dc->sc_cur-dc->sc_chain)+1);
        !           414:                }
        !           415:                if (stat & DMA_ARMED)
        !           416:                        printf("dma%d: intr when armed\n", i);
        !           417: #endif
        !           418:                if (++dc->sc_cur <= dc->sc_last) {
        !           419: #ifdef DEBUG
        !           420:                        dmatimo[i] = 1;
        !           421: #endif
        !           422:                        /*
        !           423:                         * Last chain segment, disable DMA interrupt.
        !           424:                         */
        !           425:                        if (dc->sc_cur == dc->sc_last &&
        !           426:                            (dc->sc_flags & DMAF_NOINTR))
        !           427:                                dc->sc_cmd &= ~DMA_ENAB;
        !           428:                        DMA_CLEAR(dc);
        !           429:                        DMA_ARM(dc);
        !           430:                } else
        !           431:                        dmastop(i);
        !           432:        }
        !           433:        return(found);
        !           434: }
        !           435: 
        !           436: #ifdef DEBUG
        !           437: void
        !           438: dmatimeout()
        !           439: {
        !           440:        register int i, s;
        !           441: 
        !           442:        for (i = 0; i < NDMA; i++) {
        !           443:                s = splbio();
        !           444:                if (dmatimo[i]) {
        !           445:                        if (dmatimo[i] > 1)
        !           446:                                printf("dma%d: timeout #%d\n",
        !           447:                                       i, dmatimo[i]-1);
        !           448:                        dmatimo[i]++;
        !           449:                }
        !           450:                splx(s);
        !           451:        }
        !           452:        timeout(dmatimeout, (caddr_t)0, 30 * hz);
        !           453: }
        !           454: #endif

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