+/*
+ * RP04/RP06 disk driver
+ */
+
+#include "../h/param.h"
+#include "../h/uba.h"
+#include "../h/systm.h"
+#include "../h/buf.h"
+#include "../h/conf.h"
+#include "../h/dir.h"
+#include "../h/user.h"
+#include "../h/map.h"
+#include "../h/mba.h"
+
+#define DK_N 0
+
+struct device
+{
+ int hpcs1; /* control and Status register 1 */
+ int hpds; /* Drive Status */
+ int hper1; /* Error register 1 */
+ int hpmr; /* Maintenance */
+ int hpas; /* Attention Summary */
+ int hpda; /* Desired address register */
+ int hpdt; /* Drive type */
+ int hpla; /* Look ahead */
+ int hpsn; /* serial number */
+ int hpof; /* Offset register */
+ int hpdc; /* Desired Cylinder address register */
+ int hpcc; /* Current Cylinder */
+ int hper2; /* Error register 2 */
+ int hper3; /* Error register 3 */
+ int hpec1; /* Burst error bit position */
+ int hpec2; /* Burst error bit pattern */
+};
+
+#define HPADDR ((struct device *)(MBA0 + MBA_ERB))
+#define NHP 1
+#define NSECT 22
+#define NTRAC 19
+#define SDIST 2
+#define RDIST 6
+
+struct size
+{
+ daddr_t nblocks;
+ int cyloff;
+} hp_sizes[8] =
+{
+ 9614, 0, /* cyl 0 thru 23 */
+ 65536, 44, /* cyl 44 thru 200 */
+ 65536, 201, /* cyl 201 thru 514 */
+ 65536, 515, /* cyl 515 thru 671 */
+ 65536, 358, /* cyl 358 thru 407 */
+ 0, 0,
+ 328548, 25, /* cyl 25 thru 810 */
+ 322278, 44, /* cyl 44 thru 717 */
+};
+
+#define P400 020
+#define M400 0220
+#define P800 040
+#define M800 0240
+#define P1200 060
+#define M1200 0260
+int hp_offset[16] =
+{
+ P400, M400, P400, M400,
+ P800, M800, P800, M800,
+ P1200, M1200, P1200, M1200,
+ 0, 0, 0, 0,
+};
+
+struct buf hptab;
+struct buf rhpbuf;
+struct buf hputab[NHP];
+
+#define GO 01
+#define PRESET 020
+#define RTC 016
+#define OFFSET 014
+#define SEARCH 030
+#define RECAL 06
+#define DCLR 010
+#define WCOM 060
+#define RCOM 070
+
+#define IE 0100
+#define PIP 020000
+#define DRY 0200
+#define ERR 040000
+#define TRE 040000
+#define DCK 0100000
+#define WLE 04000
+#define ECH 0100
+#define VV 0100
+#define DPR 0400
+#define MOL 010000
+#define FMT22 010000
+
+#define b_cylin b_resid
+
+daddr_t dkblock();
+
+hpstrategy(bp)
+register struct buf *bp;
+{
+ register struct buf *dp;
+ register unit;
+ long sz, bn;
+
+ unit = minor(bp->b_dev) & 077;
+ sz = bp->b_bcount;
+ sz = (sz+511) >> 9;
+ if (unit >= (NHP<<3) ||
+ bp->b_blkno < 0 ||
+ (bn = dkblock(bp))+sz > hp_sizes[unit&07].nblocks) {
+ bp->b_flags |= B_ERROR;
+ iodone(bp);
+ return;
+ }
+ bp->b_cylin = bn/(NSECT*NTRAC) + hp_sizes[unit&07].cyloff;
+ unit = dkunit(bp);
+ dp = &hputab[unit];
+ spl5();
+ disksort(dp, bp);
+ if (dp->b_active == 0) {
+ hpustart(unit);
+ if(hptab.b_active == 0)
+ hpstart();
+ }
+ spl0();
+}
+
+hpustart(unit)
+register unit;
+{
+ register struct buf *bp, *dp;
+ register struct device *hpaddr;
+ daddr_t bn;
+ int sn, cn, csn;
+
+ ((struct mba_regs *)MBA0)->mba_cr |= MBAIE;
+ HPADDR->hpas = 1<<unit;
+
+ if(unit >= NHP)
+ return;
+ dk_busy &= ~(1<<(unit+DK_N));
+ dp = &hputab[unit];
+ if((bp=dp->b_actf) == NULL)
+ return;
+ hpaddr = (struct device *)((int *)HPADDR + 32*unit);
+ if((hpaddr->hpds & VV) == 0) {
+ hpaddr->hpcs1 = PRESET|GO;
+ hpaddr->hpof = FMT22;
+ }
+ if(dp->b_active)
+ goto done;
+ dp->b_active++;
+ if ((hpaddr->hpds & (DPR|MOL)) != (DPR|MOL))
+ goto done;
+
+ bn = dkblock(bp);
+ cn = bp->b_cylin;
+ sn = bn%(NSECT*NTRAC);
+ sn = (sn+NSECT-SDIST)%NSECT;
+
+ if((hpaddr->hpcc & 0xffff) != cn)
+ goto search;
+ csn = ((hpaddr->hpla & 0xffff)>>6) - sn + SDIST - 1;
+ if(csn < 0)
+ csn += NSECT;
+ if(csn > NSECT-RDIST)
+ goto done;
+
+search:
+ hpaddr->hpdc = cn;
+ hpaddr->hpda = sn;
+ hpaddr->hpcs1 = SEARCH|GO;
+ unit += DK_N;
+ dk_busy |= 1<<unit;
+ dk_numb[unit] += 1;
+ return;
+
+done:
+ dp->b_forw = NULL;
+ if(hptab.b_actf == NULL)
+ hptab.b_actf = dp; else
+ hptab.b_actl->b_forw = dp;
+ hptab.b_actl = dp;
+}
+
+hpstart()
+{
+ register struct buf *bp, *dp;
+ register unit;
+ register struct device *hpaddr;
+ daddr_t bn;
+ int dn, sn, tn, cn;
+
+loop:
+ if ((dp = hptab.b_actf) == NULL)
+ return;
+ if ((bp = dp->b_actf) == NULL) {
+ hptab.b_actf = dp->b_forw;
+ goto loop;
+ }
+ hptab.b_active++;
+ unit = minor(bp->b_dev) & 077;
+ dn = dkunit(bp);
+ bn = dkblock(bp);
+ cn = bn/(NSECT*NTRAC) + hp_sizes[unit&07].cyloff;
+ sn = bn%(NSECT*NTRAC);
+ tn = sn/NSECT;
+ sn = sn%NSECT;
+
+ hpaddr = (struct device *)((int *)HPADDR + 32*dn);
+ if ((hpaddr->hpds & (DPR|MOL)) != (DPR|MOL)) {
+ hptab.b_active = 0;
+ hptab.b_errcnt = 0;
+ dp->b_actf = bp->av_forw;
+ bp->b_flags |= B_ERROR;
+ iodone(bp);
+ goto loop;
+ }
+ if(hptab.b_errcnt >= 16) {
+ hpaddr->hpof = hp_offset[hptab.b_errcnt & 017] | FMT22;
+ ((struct mba_regs *)MBA0)->mba_cr &= ~MBAIE;
+ hpaddr->hpcs1 = OFFSET|GO;
+ while(hpaddr->hpds & PIP)
+ ;
+ ((struct mba_regs *)MBA0)->mba_cr |= MBAIE;
+ }
+ hpaddr->hpdc = cn;
+ hpaddr->hpda = (tn << 8) + sn;
+ mbastart(bp, hpaddr);
+
+ dk_busy |= 1<<(DK_N+NHP);
+ dk_numb[DK_N+NHP] += 1;
+ unit = bp->b_bcount>>6;
+ dk_wds[DK_N+NHP] += unit;
+}
+
+hpintr(mbastat, as)
+{
+ register struct buf *bp, *dp;
+ register unit;
+ register struct device *hpaddr;
+ int i, j;
+
+ if(hptab.b_active) {
+ dk_busy &= ~(1<<(DK_N+NHP));
+ dp = hptab.b_actf;
+ bp = dp->b_actf;
+ unit = dkunit(bp);
+ hpaddr = (struct device *)((int *)HPADDR + 32*unit);
+ if (hpaddr->hpds & ERR || mbastat & MBAEBITS) { /* error bit */
+ while((hpaddr->hpds & DRY) == 0)
+ ;
+ if(++hptab.b_errcnt > 28 || hpaddr->hper1&WLE)
+ bp->b_flags |= B_ERROR; else
+ hptab.b_active = 0;
+ if(hptab.b_errcnt > 27)
+ deverror(bp, mbastat, hpaddr->hper1);
+ if((bp->b_flags&B_PHYS) == 0 &&
+ (hpaddr->hper1 & (DCK|ECH)) == DCK) {
+ i = (hpaddr->hpec1 & 0xffff) - 1;
+ j = i&037;
+ i =>> 5;
+ if(i >= 0 && i <128) {
+ bp->b_un.b_words[i] =^ (hpaddr->hpec2 & 0xffff) << j;
+ bp->b_un.b_words[i+1] =^ (hpaddr->hpec2 & 0xffff) >> (32-j);
+ }
+ hptab.b_active++;
+ printf("%D ", bp->b_blkno);
+ prdev("ECC", bp->b_dev);
+ }
+ hpaddr->hpcs1 = DCLR|GO;
+ if((hptab.b_errcnt&07) == 4) {
+ ((struct mba_regs *)MBA0)->mba_cr &= ~MBAIE;
+ hpaddr->hpcs1 = RECAL|GO;
+ while(hpaddr->hpds & PIP)
+ ;
+ ((struct mba_regs *)MBA0)->mba_cr |= MBAIE;
+ }
+ }
+ if(hptab.b_active) {
+ if(hptab.b_errcnt) {
+ ((struct mba_regs *)MBA0)->mba_cr &= ~MBAIE;
+ hpaddr->hpcs1 = RTC|GO;
+ while(hpaddr->hpds & PIP)
+ ;
+ ((struct mba_regs *)MBA0)->mba_cr |= MBAIE;
+ }
+ hptab.b_active = 0;
+ hptab.b_errcnt = 0;
+ hptab.b_actf = dp->b_forw;
+ dp->b_active = 0;
+ dp->b_errcnt = 0;
+ dp->b_actf = bp->av_forw;
+ bp->b_resid = -(((struct mba_regs *)MBA0)->mba_bcr) & 0xffff;
+ iodone(bp);
+ if(dp->b_actf)
+ hpustart(unit);
+ }
+ as &= ~(1<<unit);
+ } else {
+ if(as == 0)
+ ((struct mba_regs *)MBA0)->mba_cr |= MBAIE;
+ }
+ for(unit=0; unit<NHP; unit++)
+ if(as & (1<<unit))
+ hpustart(unit);
+ hpstart();
+}
+
+hpread(dev)
+{
+
+ physio(hpstrategy, &rhpbuf, dev, B_READ);
+}
+
+hpwrite(dev)
+{
+
+ physio(hpstrategy, &rhpbuf, dev, B_WRITE);
+}
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