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Annotation of researchv10no/sys/io/rco.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * to do:
        !             3:  *     check overflow of user read (bp->b_count)
        !             4:  *     does the address loaded into the registers
        !             5:  *     have to be on a 2k boundary?
        !             6:  */
        !             7: #include "sys/param.h"
        !             8: #include "sys/conf.h"
        !             9: #include "sys/user.h"
        !            10: #include "sys/buf.h"
        !            11: #include "sys/ubaddr.h"
        !            12: #include "sys/pte.h"
        !            13: 
        !            14: #include "sys/rco.h"
        !            15: #include "sys/rcocmd.h"
        !            16: 
        !            17: /*
        !            18:  * hardware
        !            19:  */
        !            20: struct device {
        !            21:        u_short csr;            /* control/status register */
        !            22:        u_short vr;             /* virtual register (write only)*/
        !            23:        u_short ar;             /* address register */
        !            24:        u_short xar;            /* extended address register */
        !            25: };
        !            26: 
        !            27: #define        GO      01
        !            28: #define ERROR  016             /* 02 = FAULT, 04 = TIMEOUT, 010 = OVERFLO */
        !            29: #define RESL   060
        !            30: #define HALF   0100
        !            31: #define READY  0200
        !            32: #define UBACT  07400
        !            33: #define UBALOW 010000
        !            34: #define TEOP   020000
        !            35: #define        IENABLE 040000
        !            36: 
        !            37: #define NUBMREG        4
        !            38: #define IOCHUNK (NBPG*NUBMREG)
        !            39: 
        !            40: /*
        !            41:  * config glue
        !            42:  */
        !            43: int rcoopen(), rcoclose(), rcoread(), rcoioctl();
        !            44: 
        !            45: extern struct rco rco[];
        !            46: extern struct ubaddr rcoaddr[];
        !            47: extern int rcocnt;
        !            48: struct cdevsw rcocdev = cdinit(rcoopen, rcoclose, rcoread, nodev, rcoioctl);
        !            49: 
        !            50: #define OPEN   0x01
        !            51: #define BUSY   0x02
        !            52: 
        !            53: rcoopen(d, f)
        !            54: {
        !            55:        register int dev;
        !            56:        register struct rco *rp;
        !            57: 
        !            58:        if((dev = minor(d)) >= rcocnt) {
        !            59:                u.u_error = ENODEV;
        !            60:                return;
        !            61:        }
        !            62:        if((rp = &rco[dev])->flags&OPEN) {
        !            63:                u.u_error = EBUSY;
        !            64:                return;
        !            65:        }
        !            66:        if((rp->addr = (struct device *)ubaddr(&rcoaddr[dev])) == 0
        !            67:          || ubbadaddr(rcoaddr[dev].ubno, (caddr_t)rp->addr, sizeof(u_short))) {
        !            68:                printf("rco%d absent\n", dev);
        !            69:                u.u_error = ENODEV;
        !            70:                return;
        !            71:        }
        !            72:        rp->flags = OPEN;
        !            73:        rp->addr->csr = 0;
        !            74:        rp->dither = 0;
        !            75:        rp->resol = 2;
        !            76: }
        !            77: 
        !            78: rcoclose(d)
        !            79: {
        !            80:        rco[minor(d)].flags &= ~OPEN;
        !            81: }
        !            82: 
        !            83: rcominp(bp)
        !            84: struct buf *bp;
        !            85: {
        !            86: }
        !            87: 
        !            88: rcostrategy(bp)
        !            89: register struct buf *bp;
        !            90: {
        !            91:        register struct rco *rp = &rco[minor(bp->b_dev)];
        !            92:        register uaddr_t uaddr;
        !            93:        register int s, ubno;
        !            94:        u_short csr;
        !            95: 
        !            96:        csr = IENABLE | ((rp->dither << 6) & HALF) | ((rp->resol << 4) & RESL);
        !            97:        ubno = rcoaddr[minor(bp->b_dev)].ubno;
        !            98:        rp->ubm = ubmalloc(ubno, IOCHUNK+(IOCHUNK-1), UBDP|USLP);
        !            99:        rp->chunkubm = (rp->ubm + (NUBMREG-1)) & ~(NUBMREG-1);
        !           100:        rp->pte = btopte(bp);
        !           101:        uaddr = ubmsetmap(ubno, rp->pte, NUBMREG, rp->chunkubm);
        !           102:        rp->pte += NUBMREG;
        !           103:        s = spl5();
        !           104:        rp->flags |= BUSY;
        !           105:        rp->addr->ar = uaddr & 0x7FE;           /* bits 10-1 */
        !           106:        rp->addr->xar = (uaddr >> 8) & 0x3FF8;  /* bits 21-11 */
        !           107:        while((rp->addr->csr&READY) == 0)
        !           108:                ;
        !           109:        rp->addr->csr = csr;
        !           110:        for(rp->mreg = NUBMREG; rp->mreg; rp->mreg--)
        !           111:                rp->addr->vr = 1;
        !           112:        DELAY(50000);
        !           113:        rp->addr->csr = csr | GO;
        !           114:        if(tsleep((caddr_t)bp, PRIBIO+1, 20) != TS_OK) {
        !           115:                bp->b_flags |=  B_ERROR;
        !           116:                iodone(bp);
        !           117:        }
        !           118:        rp->addr->csr = 0;
        !           119:        rp->flags &= ~BUSY;
        !           120:        splx(s);
        !           121:        bp->b_resid = 0;
        !           122:        ubmfree(ubno, rp->ubm);
        !           123: }
        !           124: 
        !           125: rcoread(d)
        !           126: {
        !           127:        if((((int)u.u_base) & (IOALIGN-1))) {
        !           128:                u.u_error = EFAULT;
        !           129:                return;
        !           130:        }
        !           131:        physio(rcostrategy, &rco[minor(d)].buf, d, B_READ, rcominp);
        !           132: }
        !           133: 
        !           134: rcoioctl(dev, cmd, addr, flag)
        !           135: caddr_t addr;
        !           136: {
        !           137:        register struct rco *rp = &rco[minor(dev)];
        !           138:        int i;
        !           139: 
        !           140:        if(copyin(addr, (caddr_t)&i, sizeof(i))) {
        !           141:                u.u_error = EFAULT;
        !           142:                return;
        !           143:        }
        !           144:        switch(cmd) {
        !           145: 
        !           146:        case RCORES:
        !           147:                rp->resol = i;
        !           148:                break;
        !           149: 
        !           150:        case RCODITHER:
        !           151:                rp->dither = i;
        !           152:                break;
        !           153: 
        !           154:        default:
        !           155:                u.u_error = ENXIO;
        !           156:        }
        !           157: }
        !           158: 
        !           159: rco0int(d)
        !           160: {
        !           161:        register struct rco *rp = &rco[d];
        !           162:        register struct buf *bp;
        !           163:        ubm_t ubm;
        !           164:        u_short csr;
        !           165: 
        !           166:        if((rp->flags & (BUSY|OPEN)) != (BUSY|OPEN)) {
        !           167:                printf("rco%d: not busy interrupt\n", d);
        !           168:                rp->addr->csr = 0;
        !           169:                return;
        !           170:        }
        !           171:        if((csr = rp->addr->csr) & GO) {
        !           172:                ubm = rp->chunkubm + rp->mreg++;
        !           173:                (void) ubmsetmap(rcoaddr[d].ubno, rp->pte++, 1, ubm);
        !           174:                if(rp->mreg > (NUBMREG-1))
        !           175:                        rp->mreg = 0;
        !           176:                rp->addr->vr = 1;
        !           177:                return;
        !           178:        }
        !           179:        bp = &rp->buf;
        !           180:        if((csr & ERROR) || (csr & TEOP) == 0) {
        !           181:                printf("rco%d: csr=0%o\n", d, csr);
        !           182:                bp->b_flags |= B_ERROR;
        !           183:        }
        !           184:        rp->addr->csr = 0;
        !           185:        iodone(bp);
        !           186: }

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