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Annotation of 43BSDReno/sys/hpdev/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 is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)dma.c       7.1 (Berkeley) 5/8/90
        !            21:  */
        !            22: 
        !            23: /*
        !            24:  * DMA driver
        !            25:  */
        !            26: 
        !            27: #include "param.h"
        !            28: #include "systm.h"
        !            29: #include "time.h"
        !            30: #include "kernel.h"
        !            31: #include "proc.h"
        !            32: #include "dmareg.h"
        !            33: #include "dmavar.h"
        !            34: #include "device.h"
        !            35: 
        !            36: #include "machine/cpu.h"
        !            37: #include "machine/isr.h"
        !            38: 
        !            39: extern void isrlink();
        !            40: extern void printf();
        !            41: extern void panic();
        !            42: extern void _insque();
        !            43: extern void _remque();
        !            44: extern void timeout();
        !            45: extern int splbio();
        !            46: extern void splx();
        !            47: extern u_int kvtop();
        !            48: extern void PCIA();
        !            49: 
        !            50: /*
        !            51:  * The largest single request will be MAXPHYS bytes which will require
        !            52:  * at most MAXPHYS/NBPG+1 chain elements to describe, i.e. if none of
        !            53:  * the buffer pages are physically contiguous (MAXPHYS/NBPG) and the
        !            54:  * buffer is not page aligned (+1).
        !            55:  */
        !            56: #define        DMAMAXIO        (MAXPHYS/NBPG+1)
        !            57: 
        !            58: #define        DMATIMO         15
        !            59: 
        !            60: struct dma_softc {
        !            61:        struct dmadevice *sc_hwaddr;
        !            62:        struct dmaBdevice *sc_Bhwaddr;
        !            63:        int     sc_type;
        !            64:        int     sc_cur;
        !            65:        int     sc_cmd;
        !            66:        int     sc_timo;
        !            67:        int     sc_count[DMAMAXIO+1];
        !            68:        char    *sc_addr[DMAMAXIO+1];
        !            69: } dma_softc[NDMA];
        !            70: 
        !            71: /* types */
        !            72: #define        DMA_B   0
        !            73: #define DMA_C  1
        !            74: 
        !            75: struct devqueue dmachan[NDMA + 1];
        !            76: int    dmaintr();
        !            77: void   dmatimo();
        !            78: 
        !            79: #ifdef DEBUG
        !            80: int    dmadebug = 0;
        !            81: #define DDB_WORD       0x01    /* same as DMAGO_WORD */
        !            82: #define DDB_LWORD      0x02    /* same as DMAGO_LWORD */
        !            83: #define        DDB_FOLLOW      0x04
        !            84: #define DDB_IO         0x08
        !            85: 
        !            86: long   dmahits[NDMA];
        !            87: long   dmamisses[NDMA];
        !            88: long   dmabyte[NDMA];
        !            89: long   dmaword[NDMA];
        !            90: long   dmalword[NDMA];
        !            91: #endif
        !            92: 
        !            93: void
        !            94: dmainit()
        !            95: {
        !            96:        register struct dmareg *dma = (struct dmareg *)DMA_BASE;
        !            97:        register struct dma_softc *dc;
        !            98:        register int i;
        !            99:        char rev;
        !           100: 
        !           101:        /*
        !           102:         * Determine the DMA type.
        !           103:         * Don't know how to easily differentiate the A and B cards,
        !           104:         * so we just hope nobody has an A card (A cards will work if
        !           105:         * DMAINTLVL is set to 3).
        !           106:         */
        !           107:        if (!badbaddr((char *)&dma->dma_id[2]))
        !           108:                rev = dma->dma_id[2];
        !           109:        else {
        !           110:                rev = 'B';
        !           111: #if !defined(HP320)
        !           112:                panic("dmainit: DMA card requires hp320 support");
        !           113: #endif
        !           114:        }
        !           115: 
        !           116:        dc = &dma_softc[0];
        !           117:        for (i = 0; i < NDMA; i++) {
        !           118:                dc->sc_hwaddr = (i & 1) ? &dma->dma_chan1 : &dma->dma_chan0;
        !           119:                dc->sc_Bhwaddr = (i & 1) ? &dma->dma_Bchan1 : &dma->dma_Bchan0;
        !           120:                dc->sc_type = rev == 'B' ? DMA_B : DMA_C;
        !           121:                dc++;
        !           122:                dmachan[i].dq_forw = dmachan[i].dq_back = &dmachan[i];
        !           123:        }
        !           124:        dmachan[i].dq_forw = dmachan[i].dq_back = &dmachan[i];
        !           125:        timeout(dmatimo, (caddr_t)0, DMATIMO * hz);
        !           126: 
        !           127:        printf("dma: 98620%c with 2 channels, %d bit DMA\n",
        !           128:               rev, rev == 'B' ? 16 : 32);
        !           129: }
        !           130: 
        !           131: int
        !           132: dmareq(dq)
        !           133:        register struct devqueue *dq;
        !           134: {
        !           135:        register int i;
        !           136:        register int chan;
        !           137:        register int s = splbio();
        !           138: 
        !           139:        chan = dq->dq_ctlr;
        !           140:        i = NDMA;
        !           141:        while (--i >= 0) {
        !           142:                if ((chan & (1 << i)) == 0)
        !           143:                        continue;
        !           144:                if (dmachan[i].dq_forw != &dmachan[i])
        !           145:                        continue;
        !           146:                insque(dq, &dmachan[i]);
        !           147:                dq->dq_ctlr = i;
        !           148:                splx(s);
        !           149:                return(1);
        !           150:        }
        !           151:        insque(dq, dmachan[NDMA].dq_back);
        !           152:        splx(s);
        !           153:        return(0);
        !           154: }
        !           155: 
        !           156: void
        !           157: dmafree(dq)
        !           158:        register struct devqueue *dq;
        !           159: {
        !           160:        int unit = dq->dq_ctlr;
        !           161:        register struct dma_softc *dc = &dma_softc[unit];
        !           162:        register struct devqueue *dn;
        !           163:        register int chan, s;
        !           164: 
        !           165:        s = splbio();
        !           166:        dc->sc_timo = 0;
        !           167:        DMA_CLEAR(dc);
        !           168:        remque(dq);
        !           169:        chan = 1 << unit;
        !           170:        for (dn = dmachan[NDMA].dq_forw;
        !           171:             dn != &dmachan[NDMA]; dn = dn->dq_forw) {
        !           172:                if (dn->dq_ctlr & chan) {
        !           173:                        remque((caddr_t)dn);
        !           174:                        insque((caddr_t)dn, (caddr_t)dq->dq_back);
        !           175:                        splx(s);
        !           176:                        dn->dq_ctlr = dq->dq_ctlr;
        !           177:                        (dn->dq_driver->d_start)(dn->dq_unit);
        !           178:                        return;
        !           179:                }
        !           180:        }
        !           181:        splx(s);
        !           182: }
        !           183: 
        !           184: void
        !           185: dmago(unit, addr, count, flags)
        !           186:        int unit;
        !           187:        register char *addr;
        !           188:        register int count;
        !           189:        register int flags;
        !           190: {
        !           191:        register struct dma_softc *dc = &dma_softc[unit];
        !           192:        register char *dmaend = NULL;
        !           193:        register int tcount, i;
        !           194: 
        !           195: #ifdef DEBUG
        !           196:        if (dmadebug & DDB_FOLLOW)
        !           197:                printf("dmago(%d, %x, %x, %x)\n",
        !           198:                       unit, addr, count, flags);
        !           199:        if (flags & DMAGO_LWORD)
        !           200:                dmalword[unit]++;
        !           201:        else if (flags & DMAGO_WORD)
        !           202:                dmaword[unit]++;
        !           203:        else
        !           204:                dmabyte[unit]++;
        !           205: #endif
        !           206: #if defined(HP320)
        !           207:        if (dc->sc_type == DMA_B && (flags & DMAGO_LWORD))
        !           208:                panic("dmago: no can do 32-bit DMA");
        !           209: #endif
        !           210:        /*
        !           211:         * Build the DMA chain
        !           212:         */
        !           213:        for (i = 0; i < DMAMAXIO && count; i++) {
        !           214:                dc->sc_addr[i] = (char *)kvtop(addr);
        !           215:                tcount = dc->sc_count[i] =
        !           216:                        MIN(count, NBPG - ((int)addr & PGOFSET));
        !           217:                addr += dc->sc_count[i];
        !           218:                count -= tcount;
        !           219:                if (flags & (DMAGO_WORD|DMAGO_LWORD))
        !           220:                        tcount >>= (flags & DMAGO_WORD) ? 1 : 2;
        !           221:                if (dc->sc_addr[i] == dmaend
        !           222: #if defined(HP320)
        !           223:                    /* only 16-bit count on 98620B */
        !           224:                    && (dc->sc_type != DMA_B ||
        !           225:                        dc->sc_count[i-1] + tcount <= 65536)
        !           226: #endif
        !           227:                ) {
        !           228: #ifdef DEBUG
        !           229:                        dmahits[unit]++;
        !           230: #endif
        !           231:                        dmaend += dc->sc_count[i];
        !           232:                        dc->sc_count[i-1] += tcount;
        !           233:                        i--;
        !           234:                } else {
        !           235: #ifdef DEBUG
        !           236:                        dmamisses[unit]++;
        !           237: #endif
        !           238:                        dmaend = dc->sc_addr[i] + dc->sc_count[i];
        !           239:                        dc->sc_count[i] = tcount;
        !           240:                }
        !           241:        }
        !           242:        if (count)
        !           243:                panic("dmago maxphys");
        !           244:        dc->sc_count[i] = 0;
        !           245:        dc->sc_cur = 0;
        !           246:        /*
        !           247:         * Set up the command word based on flags
        !           248:         */
        !           249:        dc->sc_cmd = DMA_ENAB | DMA_IPL(DMAINTLVL) | DMA_START;
        !           250:        if ((flags & DMAGO_READ) == 0)
        !           251:                dc->sc_cmd |= DMA_WRT;
        !           252:        if (flags & DMAGO_LWORD)
        !           253:                dc->sc_cmd |= DMA_LWORD;
        !           254:        else if (flags & DMAGO_WORD)
        !           255:                dc->sc_cmd |= DMA_WORD;
        !           256:        if (flags & DMAGO_PRI)
        !           257:                dc->sc_cmd |= DMA_PRI;
        !           258: 
        !           259:        /*
        !           260:         * We should be able to skip the dma completion interrupt
        !           261:         * if we only have one segment in the chain since many
        !           262:         * devices generate their own completion interrupt.
        !           263:         * However, on a 370 we have to take the interrupt on
        !           264:         * read transfers to invalidate the external cache.
        !           265:         */
        !           266:        if ((flags & DMAGO_NOINT) && i == 1
        !           267: #if defined(HP370)
        !           268:            && ((flags & DMAGO_READ) == 0 || ectype != EC_PHYS)
        !           269: #endif
        !           270:        )
        !           271:                dc->sc_cmd &= ~DMA_ENAB;
        !           272: #ifdef DEBUG
        !           273: #if defined(HP320)
        !           274:        /* would this hurt? */
        !           275:        if (dc->sc_type == DMA_B)
        !           276:                dc->sc_cmd &= ~DMA_START;
        !           277: #endif
        !           278:        if (dmadebug & DDB_IO)
        !           279:                if ((dmadebug&DDB_WORD) && (dc->sc_cmd&DMA_WORD) ||
        !           280:                    (dmadebug&DDB_LWORD) && (dc->sc_cmd&DMA_LWORD)) {
        !           281:                        printf("dmago: cmd %x\n", dc->sc_cmd);
        !           282:                        for (i = 0; dc->sc_count[i]; i++) 
        !           283:                                printf("  %d: %d@%x\n",
        !           284:                                       i, dc->sc_count[i], dc->sc_addr[i]);
        !           285:                }
        !           286: #endif
        !           287: 
        !           288:        /*
        !           289:         * Load and arm the channel
        !           290:         */
        !           291:        dc->sc_timo = 1;
        !           292:        DMA_ARM(dc, 0);
        !           293: }
        !           294: 
        !           295: void
        !           296: dmastop(unit)
        !           297:        register int unit;
        !           298: {
        !           299:        register struct dma_softc *dc = &dma_softc[unit];
        !           300:        register struct devqueue *dq;
        !           301: 
        !           302: #ifdef DEBUG
        !           303:        if (dmadebug & DDB_FOLLOW)
        !           304:                printf("dmastop(%d)\n", unit);
        !           305: #endif
        !           306:        dc->sc_timo = 0;
        !           307:        DMA_CLEAR(dc);
        !           308: 
        !           309:        /*
        !           310:         * We may get this interrupt after a device service routine
        !           311:         * has freed the dma channel.  So, ignore the intr if there's
        !           312:         * nothing on the queue.
        !           313:         */
        !           314:        dq = dmachan[unit].dq_forw;
        !           315:        if (dq != &dmachan[unit]) {
        !           316: #if defined(HP370)
        !           317:                /*
        !           318:                 * The 370 has an 64k external physical address cache.
        !           319:                 * In theory, we should only need to flush it when
        !           320:                 * DMAing to memory.
        !           321:                 */
        !           322:                if (ectype == EC_PHYS && (dc->sc_cmd & DMA_WRT) == 0)
        !           323:                        PCIA();
        !           324: #endif
        !           325:                (dq->dq_driver->d_done)(dq->dq_unit);
        !           326:        }
        !           327: }
        !           328: 
        !           329: int
        !           330: dmaintr()
        !           331: {
        !           332:        register struct dma_softc *dc;
        !           333:        register int i, j, stat;
        !           334:        int found = 0;
        !           335: 
        !           336: #ifdef DEBUG
        !           337:        if (dmadebug & DDB_FOLLOW)
        !           338:                printf("dmaintr\n");
        !           339: #endif
        !           340:        for (i = 0, dc = dma_softc; i < NDMA; i++, dc++) {
        !           341:                stat = DMA_STAT(dc);
        !           342:                if ((stat & DMA_INTR) == 0)
        !           343:                        continue;
        !           344:                found++;
        !           345: #ifdef DEBUG
        !           346:                if (dmadebug & DDB_IO) {
        !           347:                        if ((dmadebug&DDB_WORD) && (dc->sc_cmd&DMA_WORD) ||
        !           348:                            (dmadebug&DDB_LWORD) && (dc->sc_cmd&DMA_LWORD))
        !           349:                                printf("dmaintr: unit %d stat %x next %d\n",
        !           350:                                       i, stat, dc->sc_cur+1);
        !           351:                }
        !           352:                if (stat & DMA_ARMED)
        !           353:                        printf("dma%d: intr when armed\n", i);
        !           354: #endif
        !           355:                j = ++dc->sc_cur;
        !           356:                if (j < DMAMAXIO && dc->sc_count[j]) {
        !           357:                        dc->sc_timo = 1;
        !           358:                        DMA_CLEAR(dc);
        !           359:                        DMA_ARM(dc, j);
        !           360:                } else
        !           361:                        dmastop(i);
        !           362:        }
        !           363:        return(found);
        !           364: }
        !           365: 
        !           366: void
        !           367: dmatimo()
        !           368: {
        !           369:        register int i, s;
        !           370:        register struct dma_softc *dc = &dma_softc[0];
        !           371: 
        !           372:        for (i = 0; i < NDMA; i++, dc++) {
        !           373:                s = splbio();
        !           374:                if (dc->sc_timo) {
        !           375:                        if (dc->sc_timo == 1)
        !           376:                                dc->sc_timo++;
        !           377:                        else
        !           378:                                dmastop(i);
        !           379:                }
        !           380:                splx(s);
        !           381:        }
        !           382:        timeout(dmatimo, (caddr_t)0, DMATIMO * hz);
        !           383: }

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