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NetBSD/sys/arch/vax/boot/mfm.c

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/* $NetBSD: mfm.c,v 1.2 1997/03/15 13:04:28 ragge Exp $ */
/*
* Copyright (c) 1996 Ludd, University of Lule}, Sweden.
* All rights reserved.
*
* This code is derived from software contributed to Ludd by
* Bertram Barth.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed at Ludd, University of
* Lule}, Sweden and its contributors.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* ToDo:
*
* - insert appropriate delays for diskette-drive where needed
* - allow more than one sector per diskette-read
* - check for and handle bad sectors
* - ???
*/
#include "sys/param.h"
#include "sys/reboot.h"
#include "sys/disklabel.h"
#include "lib/libsa/stand.h"
#include "lib/libsa/ufs.h"
#include "../include/pte.h"
#include "../include/sid.h"
#include "../include/mtpr.h"
#include "../include/reg.h"
#include "../include/rpb.h"
#include "ka410.h"
#include "../vsa/hdc9224.h"
#include "data.h"
#include "vaxstand.h"
#define MAX_WAIT (1000*1000) /* # of loop-instructions in seconds */
struct mfm_softc {
int part;
int unit;
};
int mfmstrategy(), mfmopen();
struct disklabel mfmlabel;
struct mfm_softc mfm_softc;
char io_buf[MAXBSIZE];
/*
* These should probably be somewhere else, but ka410 is the only
* one with mfm disks anyway...
*/
volatile unsigned char *ka410_intreq = (void*)0x2008000f;
volatile unsigned char *ka410_intclr = (void*)0x2008000f;
volatile unsigned char *ka410_intmsk = (void*)0x2008000c;
static volatile struct hdc9224_DKCreg *dkc = (void *) 0x200c0000;
static volatile struct hdc9224_UDCreg sreg; /* input */
static volatile struct hdc9224_UDCreg creg; /* output */
/*
* we have to wait 0.7 usec between two accesses to any of the
* dkc-registers, on a VS2000 with 1 MIPS, this is roughly one
* instruction. Thus the loop-overhead will be enough...
*/
static int
sreg_read()
{
int i;
char *p;
dkc->dkc_cmd = 0x40; /* set internal counter to zero */
p = (void *) &sreg;
for (i = 0; i < 10; i++)
*p++ = dkc->dkc_reg; /* dkc_reg auto-increments */
}
static int
creg_write()
{
int i;
char *p;
dkc->dkc_cmd = 0x40; /* set internal counter to zero */
p = (void *) &creg;
for (i = 0; i < 10; i++)
dkc->dkc_reg = *p++; /* dkc_reg auto-increments */
}
/*
* floppies are handled in a quite strange way by this controller...
*
* before reading/writing a sector from/to floppy, we use the SEEK/READ_ID
* command to place the head at the desired location. Then we wait some
* time before issueing the real command in order to let the drive become
* ready...
*/
int
mfm_rxprepare()
{
int error;
error = mfm_command(DKC_CMD_SEEKREADID | 0x04); /* step=1, verify=0 */
if (error) {
printf("error while stepping to position %d/%d/%x. Retry...\n",
creg.udc_dsect, creg.udc_dhead, creg.udc_dcyl);
error = mfm_command(DKC_CMD_SEEKREADID | 0x04);
}
return error;
}
int
mfm_rxselect(unit)
int unit;
{
int error;
/*
* bring "creg" in some known-to-work state and
* select the drive with the DRIVE SELECT command.
*/
creg.udc_dma7 = 0;
creg.udc_dma15 = 0;
creg.udc_dma23 = 0;
creg.udc_dsect = 1; /* sectors are numbered 1..15 !!! */
creg.udc_dhead = 0;
creg.udc_dcyl = 0;
creg.udc_scnt = 0;
creg.udc_rtcnt = UDC_RC_RX33READ;
creg.udc_mode = UDC_MD_RX33;
creg.udc_term = UDC_TC_FDD;
/*
* this is ...
*/
error = mfm_command(DKC_CMD_DRSEL_RX33 | unit);
if ((error != 0) || (sreg.udc_dstat & UDC_DS_READY == 0)) {
printf("\nfloppy-drive not ready (new floppy inserted?)\n\n");
creg.udc_rtcnt &= ~UDC_RC_INVRDY; /* clear INVRDY-flag */
error = mfm_command(DKC_CMD_DRSEL_RX33 | unit);
if ((error != 0) || (sreg.udc_dstat & UDC_DS_READY == 0)) {
printf("diskette not ready(1): %x/%x\n",
error, sreg.udc_dstat);
printf("floppy-drive offline?\n");
return (-1);
}
if (sreg.udc_dstat & UDC_DS_TRK00)
error = mfm_command(DKC_CMD_STEPIN_FDD);
else
error = mfm_command(DKC_CMD_STEPOUT_FDD);
/*
* now ready should be 0, cause INVRDY is not set
* (retrying a command makes this fail...)
*/
if ((error != 0) || (sreg.udc_dstat & UDC_DS_READY == 1)) {
printf("diskette not ready(2): %x/%x\n",
error, sreg.udc_dstat);
}
creg.udc_rtcnt |= UDC_RC_INVRDY;
error = mfm_command(DKC_CMD_DRSEL_RX33 | unit);
if ((error != 0) || (sreg.udc_dstat & UDC_DS_READY == 0)) {
printf("diskette not ready(3): %x/%x\n",
error, sreg.udc_dstat);
printf("no floppy inserted or floppy-door open\n");
return (-1);
}
printf("floppy-drive reselected.\n");
}
return (error);
}
int
mfm_rdselect(unit)
int unit;
{
int error;
/*
* bring "creg" in some known-to-work state and
* select the drive with the DRIVE SELECT command.
*/
creg.udc_dma7 = 0;
creg.udc_dma15 = 0;
creg.udc_dma23 = 0;
creg.udc_dsect = 0; /* sectors are numbered 0..16 */
creg.udc_dhead = 0;
creg.udc_dcyl = 0;
creg.udc_scnt = 0;
creg.udc_rtcnt = UDC_RC_HDD_READ;
creg.udc_mode = UDC_MD_HDD;
creg.udc_term = UDC_TC_HDD;
error = mfm_command(DKC_CMD_DRSEL_HDD | unit);
return (error);
}
static int mfm_retry = 0;
int
mfm_command(cmd)
int cmd;
{
int termcode, ready, i;
creg_write(); /* write command-registers */
*ka410_intclr = INTR_DC;
dkc->dkc_cmd = cmd; /* issue command */
for (i = 0; i < MAX_WAIT; i++) {
if (*ka410_intreq & INTR_DC) /* wait for interrupt */
break;
}
if ((*ka410_intreq & INTR_DC) == 0)
printf("timeout in mfm_command...\n");
sreg_read(); /* read status-registers */
if (dkc->dkc_stat == (DKC_ST_DONE | DKC_TC_SUCCESS))
return (0);
if (sreg.udc_cstat & UDC_CS_ECCERR) {
printf(
"\nspurious(?) ECC/CRC error at s%d/t%d/c%d [s%d/t%d/c%d(%d)]\n",
sreg.udc_csect, sreg.udc_chead, sreg.udc_ccyl,
creg.udc_dsect, creg.udc_dhead, creg.udc_dcyl,creg.udc_scnt);
if (sreg.udc_csect != creg.udc_dsect + creg.udc_scnt - 1) {
printf("DMA: %x %x %x [%x]\n",
sreg.udc_dma23, sreg.udc_dma15,
sreg.udc_dma7, 512 * (sreg.udc_csect -
creg.udc_dsect));
creg.udc_scnt = creg.udc_scnt -
(sreg.udc_csect - creg.udc_dsect) - 1;
creg.udc_dsect = sreg.udc_csect + 1;
creg.udc_dma23 = sreg.udc_dma23;
creg.udc_dma15 = sreg.udc_dma15 + 2;
creg.udc_dma7 = 0;
printf("Retry starting from s%d/t%d/c%d (%d). ",
creg.udc_dsect, creg.udc_dhead, creg.udc_dcyl,
creg.udc_scnt);
}
goto retry;
}
termcode = (dkc->dkc_stat & DKC_ST_TERMCOD) >> 3;
ready = sreg.udc_dstat & UDC_DS_READY;
printf("cmd:0x%x: termcode=0x%x, status=0x%x, cstat=0x%x, dstat=0x%x\n",
cmd, termcode, dkc->dkc_stat, sreg.udc_cstat, sreg.udc_dstat);
if (dkc->dkc_stat & DKC_ST_BADSECT)
printf("bad sector found: s%d/t%d/c%d\n", creg.udc_dsect,
creg.udc_dhead, creg.udc_dcyl);
retry:
if ((mfm_retry == 0) && (sreg.udc_cstat & UDC_CS_RETREQ)) {
mfm_retry = 1;
printf("Retrying... ");
mfm_command(cmd);
printf("Retry done.\n");
mfm_retry = 0;
}
return ((dkc->dkc_stat & DKC_ST_TERMCOD) >> 3);
}
/*
* on-disk geometry block
*/
#define _aP __attribute__ ((packed)) /* force byte-alignment */
volatile struct mfm_xbn {
char mbz[10];/* 10 bytes of zero */
long xbn_count _aP; /* number of XBNs */
long dbn_count _aP; /* number of DBNs */
long lbn_count _aP; /* number of LBNs (Logical-Block-Numbers) */
long rbn_count _aP; /* number of RBNs (Replacement-Block-Numbers) */
short nspt; /* number of sectors per track */
short ntracks;/* number of tracks */
short ncylinders; /* number of cylinders */
short precomp;/* first cylinder for write precompensation */
short reduced;/* first cylinder for reduced write current */
short seek_rate; /* seek rate or zero for buffered
* seeks */
short crc_eec;/* 0 if CRC is being used or 1 if ECC is
* being used */
short rct; /* "replacement control table" (RCT) */
short rct_ncopies; /* number of copies of the RCT */
long media_id _aP; /* media identifier */
short interleave; /* sector-to-sector interleave */
short headskew; /* head-to-head skew */
short cylskew;/* cylinder-to-cylinder skew */
short gap0_size; /* size of GAP 0 in the MFM format */
short gap1_size; /* size of GAP 1 in the MFM format */
short gap2_size; /* size of GAP 2 in the MFM format */
short gap3_size; /* size of GAP 3 in the MFM format */
short sync_value; /* sync value used to start a track
* when formatting */
char reserved[32]; /* reserved for use by the RQDX1/2/3
* formatter */
short serial_number; /* serial number */
char fill[412]; /* Filler bytes to the end of the
* block */
short checksum; /* checksum over the XBN */
} mfm_xbn;
#ifdef verbose
display_xbn(p)
struct mfm_xbn *p;
{
printf("**DiskData** XBNs: %d, DBNs: %d, LBNs: %d, RBNs: %d\n",
p->xbn_count, p->dbn_count, p->lbn_count, p->rbn_count);
printf("sect/track: %d, tracks: %d, cyl: %d, precomp/reduced: %d/%d\n",
p->nspt, p->ntracks, p->ncylinders, p->precomp, p->reduced);
printf("seek-rate: %d, crc/eec: %s, RCT: %d, RCT-copies: %d\n",
p->seek_rate, p->crc_eec ? "EEC" : "CRC", p->rct, p->rct_ncopies);
printf("media-ID: 0x%x, interleave: %d, headskew: %d, cylskew: %d\n",
&p->media_id, p->interleave, p->headskew, p->cylskew);
printf("gap0: %d, gap1: %d, gap2: %d, gap3: %d, sync-value: %d\n",
p->gap0_size, p->gap1_size, p->gap2_size, p->gap3_size,
p->sync_value);
printf("serial: %d, checksum: %d, size: %d, reserved: %32c\n",
p->serial_number, p->checksum, sizeof(*p), p->reserved);
}
#endif
mfmopen(f, adapt, ctlr, unit, part)
struct open_file *f;
int ctlr, unit, part;
{
char *msg;
struct disklabel *lp = &mfmlabel;
volatile struct mfm_softc *msc = &mfm_softc;
int i, err;
bzero(lp, sizeof(struct disklabel));
msc->unit = unit;
msc->part = part;
err = mfmstrategy(msc, F_READ, LABELSECTOR, DEV_BSIZE, io_buf, &i);
if (err) {
printf("reading disklabel: %s\n", strerror(err));
return 0;
}
msg = getdisklabel(io_buf + LABELOFFSET, lp);
if (msg)
printf("getdisklabel: %s\n", msg);
f->f_devdata = (void *) msc;
{
int k;
unsigned char *ucp;
struct mfm_xbn *xp;
/* mfmstrategy(msc, F_READ, -16, 8192, io_buf, &i); */
mfmstrategy(msc, F_READ, -16, 512, io_buf, &i);
#ifdef verbose
printf("dumping raw disk-block #0:\n");
ucp = io_buf;
for (k = 0; k < 128; k++) {
if (ucp[k] < 0x10)
printf("0");
printf("%x ", ucp[k]);
if (k % 8 == 7)
printf(" ");
if (k % 16 == 15)
printf("\n");
}
printf("\n");
xp = (void *) io_buf;
display_xbn(xp);
printf("\n");
#endif
}
if (unit == 2) { /* floppy! */
if (lp->d_ntracks != 2) {
#ifdef verbose
printf("changing number of tracks from %d to %d.\n",
lp->d_ntracks, 2);
#endif
lp->d_ntracks = 2;
}
} else { /* hard-disk */
unsigned short *usp = (void *) io_buf;
#ifdef verbose
printf("label says: s/t/c = %d/%d/%d\n",
lp->d_nsectors, lp->d_ntracks, lp->d_ncylinders);
#endif
if (lp->d_nsectors != usp[13]) {
#ifdef verbose
printf("changing number of sectors from %d to %d.\n",
lp->d_nsectors, usp[13]);
#endif
lp->d_nsectors = usp[13];
}
if (lp->d_ntracks != usp[14]) {
#ifdef verbose
printf("changing number of heads/tracks from %d to %d.\n",
lp->d_ntracks, usp[14]);
#endif
lp->d_ntracks = usp[14];
}
if (lp->d_ncylinders != usp[15]) {
#ifdef verbose
printf("changing number of cylinders from %d to %d.\n",
lp->d_ncylinders, usp[15]);
#endif
lp->d_ncylinders = usp[15];
}
lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
}
return (0);
}
mfm_rxstrategy(msc, func, dblk, size, buf, rsize)
struct mfm_softc *msc;
int func;
daddr_t dblk;
char *buf;
int size, *rsize;
{
struct disklabel *lp;
int block, sect, head, cyl, scount, i, cmd, res, sval;
lp = &mfmlabel;
block = (dblk < 0 ? 0 : dblk + lp->d_partitions[msc->part].p_offset);
mfm_rxselect(msc->unit);
/*
* if label is empty, assume RX33
*/
if (lp->d_nsectors == 0)
lp->d_nsectors = 15;
if (lp->d_ntracks == 0)
lp->d_ntracks = 2;
if (lp->d_secpercyl == 0)
lp->d_secpercyl = 30;
bzero((void *) 0x200D0000, size);
scount = size / 512;
while (scount) {
/*
* prepare drive/operation parameter
*/
cyl = block / lp->d_secpercyl;
sect = block % lp->d_secpercyl;
head = sect / lp->d_nsectors;
sect = sect % lp->d_nsectors;
/*
* *rsize = 512; /* one sector after the other
* ...
*/
*rsize = 512 * min(scount, lp->d_nsectors - sect);
/*
* now initialize the register values ...
*/
creg.udc_dma7 = 0;
creg.udc_dma15 = 0;
creg.udc_dma23 = 0;
creg.udc_dsect = sect + 1; /* sectors are numbered 1..15
* !!! */
head |= (cyl >> 4) & 0x70;
creg.udc_dhead = head;
creg.udc_dcyl = cyl;
creg.udc_scnt = *rsize / 512;
if (func == F_WRITE) {
creg.udc_rtcnt = UDC_RC_RX33WRT;
creg.udc_mode = UDC_MD_RX33;
creg.udc_term = UDC_TC_FDD;
mfm_rxprepare();
/* copy from buf */
bcopy(buf, (void *) 0x200D0000, *rsize);
res = mfm_command(DKC_CMD_WRITE_RX33);
} else {
creg.udc_rtcnt = UDC_RC_RX33READ;
creg.udc_mode = UDC_MD_RX33;
creg.udc_term = UDC_TC_FDD;
mfm_rxprepare();
/* clear disk buffer */
bzero((void *) 0x200D0000, *rsize);
res = mfm_command(DKC_CMD_READ_RX33);
/* copy to buf */
bcopy((void *) 0x200D0000, buf, *rsize);
}
scount -= *rsize / 512;
block += *rsize / 512;
buf += *rsize;
}
*rsize = size;
return 0;
}
mfm_rdstrategy(msc, func, dblk, size, buf, rsize)
struct mfm_softc *msc;
int func;
daddr_t dblk;
char *buf;
int size, *rsize;
{
struct disklabel *lp;
int block, sect, head, cyl, scount, i, cmd, res, sval;
lp = &mfmlabel;
block = (dblk < 0 ? 0 : dblk + lp->d_partitions[msc->part].p_offset);
/*
* if label is empty, assume RD32 (XXX this must go away!!!)
*/
if (lp->d_nsectors == 0)
lp->d_nsectors = 17;
if (lp->d_ntracks == 0)
lp->d_ntracks = 6;
if (lp->d_secpercyl == 0)
lp->d_secpercyl = 102;
mfm_rdselect(msc->unit);
bzero((void *) 0x200D0000, size);
scount = size / 512;
while (scount) {
/*
* prepare drive/operation parameter
*/
cyl = block / lp->d_secpercyl;
sect = block % lp->d_secpercyl;
head = sect / lp->d_nsectors;
sect = sect % lp->d_nsectors;
if (dblk < 0) {
#ifdef verbose
printf("using raw diskblock-data!\n");
printf("block %d, dblk %d ==> cyl %d, head %d, sect %d\n",
block, dblk, cyl, sect, head);
#endif
} else
cyl += 1; /* first cylinder is reserved for
* controller! */
*rsize = 512 * min(scount, lp->d_nsectors - sect);
/*
* now re-initialize the register values ...
*/
creg.udc_dma7 = 0;
creg.udc_dma15 = 0;
creg.udc_dma23 = 0;
creg.udc_dsect = sect;
head |= (cyl >> 4) & 0x70;
creg.udc_dhead = head;
creg.udc_dcyl = cyl;
creg.udc_scnt = *rsize / 512;
if (func == F_WRITE) {
creg.udc_rtcnt = UDC_RC_HDD_WRT;
creg.udc_mode = UDC_MD_HDD;
creg.udc_term = UDC_TC_HDD;
cmd = DKC_CMD_WRITE_HDD;
bcopy(buf, (void *) 0x200D0000, *rsize);
res = mfm_command(cmd);
} else {
creg.udc_rtcnt = UDC_RC_HDD_READ;
creg.udc_mode = UDC_MD_HDD;
creg.udc_term = UDC_TC_HDD;
cmd = DKC_CMD_READ_HDD;
bzero((void *) 0x200D0000, *rsize);
res = mfm_command(cmd);
bcopy((void *) 0x200D0000, buf, *rsize);
}
scount -= *rsize / 512;
block += *rsize / 512;
buf += *rsize;
}
/*
* unselect the drive ...
*/
mfm_command(DKC_CMD_DRDESELECT);
*rsize = size;
return 0;
}
int
mfmstrategy(msc, func, dblk, size, buf, rsize)
struct mfm_softc *msc;
int func;
daddr_t dblk;
char *buf;
int size, *rsize;
{
int res = -1;
switch (msc->unit) {
case 0:
case 1:
res = mfm_rdstrategy(msc, func, dblk, size, buf, rsize);
break;
case 2:
res = mfm_rxstrategy(msc, func, dblk, size, buf, rsize);
break;
default:
printf("invalid unit %d in mfmstrategy()\n");
}
return (res);
}
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