4.4BSD/usr/src/sys/hp300/stand/scsi.c
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Van Jacobson of Lawrence Berkeley Laboratory and the Systems
* Programming Group of the University of Utah Computer Science Department.
*
* 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 by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* from: Utah $Hdr: scsi.c 1.3 90/01/27$
*
* @(#)scsi.c 8.1 (Berkeley) 6/10/93
*/
/*
* SCSI bus driver for standalone programs.
*/
#include <sys/param.h>
#include <sys/reboot.h>
#include <hp/dev/device.h>
#include <hp300/dev/scsireg.h>
#include <hp300/stand/scsivar.h>
#include <stand.att/saio.h>
#include <hp300/stand/samachdep.h>
struct scsi_softc scsi_softc[NSCSI];
void scsireset();
int scsi_cmd_wait = 50000; /* use the "real" driver init_wait value */
int scsi_data_wait = 50000; /* use the "real" driver init_wait value */
scsiinit()
{
extern struct hp_hw sc_table[];
register struct hp_hw *hw;
register struct scsi_softc *hs;
register int i, addr;
static int waitset = 0;
i = 0;
for (hw = sc_table; i < NSCSI && hw < &sc_table[MAXCTLRS]; hw++) {
if (!HW_ISSCSI(hw))
continue;
hs = &scsi_softc[i];
hs->sc_addr = hw->hw_kva;
scsireset(i);
if (howto & RB_ASKNAME)
printf("scsi%d at sc%d\n", i, hw->hw_sc);
hw->hw_pa = (caddr_t) i; /* XXX for autoconfig */
hs->sc_alive = 1;
i++;
}
/*
* Adjust the wait values
*/
if (!waitset) {
scsi_cmd_wait *= cpuspeed;
scsi_data_wait *= cpuspeed;
waitset = 1;
}
}
scsialive(unit)
register int unit;
{
if (unit >= NSCSI || scsi_softc[unit].sc_alive == 0)
return (0);
return (1);
}
void
scsireset(unit)
register int unit;
{
volatile register struct scsidevice *hd;
register struct scsi_softc *hs;
u_int i;
hs = &scsi_softc[unit];
hd = (struct scsidevice *)hs->sc_addr;
hd->scsi_id = 0xFF;
DELAY(100);
/*
* Disable interrupts then reset the FUJI chip.
*/
hd->scsi_csr = 0;
hd->scsi_sctl = SCTL_DISABLE | SCTL_CTRLRST;
hd->scsi_scmd = 0;
hd->scsi_tmod = 0;
hd->scsi_pctl = 0;
hd->scsi_temp = 0;
hd->scsi_tch = 0;
hd->scsi_tcm = 0;
hd->scsi_tcl = 0;
hd->scsi_ints = 0;
/*
* Configure the FUJI chip with its SCSI address, all
* interrupts enabled & appropriate parity.
*/
i = (~hd->scsi_hconf) & 0x7;
hs->sc_scsi_addr = 1 << i;
hd->scsi_bdid = i;
if (hd->scsi_hconf & HCONF_PARITY)
hd->scsi_sctl = SCTL_DISABLE | SCTL_ABRT_ENAB |
SCTL_SEL_ENAB | SCTL_RESEL_ENAB |
SCTL_INTR_ENAB | SCTL_PARITY_ENAB;
else
hd->scsi_sctl = SCTL_DISABLE | SCTL_ABRT_ENAB |
SCTL_SEL_ENAB | SCTL_RESEL_ENAB |
SCTL_INTR_ENAB;
hd->scsi_sctl &=~ SCTL_DISABLE;
}
int
scsiabort(hs, hd)
register struct scsi_softc *hs;
volatile register struct scsidevice *hd;
{
printf("scsi%d error: scsiabort\n", hs - scsi_softc);
scsireset(hs - scsi_softc);
DELAY(1000000);
}
static int
issue_select(hd, target, our_addr)
volatile register struct scsidevice *hd;
u_char target, our_addr;
{
if (hd->scsi_ssts & (SSTS_INITIATOR|SSTS_TARGET|SSTS_BUSY))
return (1);
if (hd->scsi_ints & INTS_DISCON)
hd->scsi_ints = INTS_DISCON;
hd->scsi_pctl = 0;
hd->scsi_temp = (1 << target) | our_addr;
/* select timeout is hardcoded to 2ms */
hd->scsi_tch = 0;
hd->scsi_tcm = 32;
hd->scsi_tcl = 4;
hd->scsi_scmd = SCMD_SELECT;
return (0);
}
static int
wait_for_select(hd)
volatile register struct scsidevice *hd;
{
register int wait;
u_char ints;
wait = scsi_data_wait;
while ((ints = hd->scsi_ints) == 0) {
if (--wait < 0)
return (1);
DELAY(1);
}
hd->scsi_ints = ints;
return (!(hd->scsi_ssts & SSTS_INITIATOR));
}
static int
ixfer_start(hd, len, phase, wait)
volatile register struct scsidevice *hd;
int len;
u_char phase;
register int wait;
{
hd->scsi_tch = len >> 16;
hd->scsi_tcm = len >> 8;
hd->scsi_tcl = len;
hd->scsi_pctl = phase;
hd->scsi_tmod = 0; /*XXX*/
hd->scsi_scmd = SCMD_XFR | SCMD_PROG_XFR;
/* wait for xfer to start or svc_req interrupt */
while ((hd->scsi_ssts & SSTS_BUSY) == 0) {
if (hd->scsi_ints || --wait < 0)
return (0);
DELAY(1);
}
return (1);
}
static int
ixfer_out(hd, len, buf)
volatile register struct scsidevice *hd;
int len;
register u_char *buf;
{
register int wait = scsi_data_wait;
for (; len > 0; --len) {
while (hd->scsi_ssts & SSTS_DREG_FULL) {
if (hd->scsi_ints || --wait < 0)
return (len);
DELAY(1);
}
hd->scsi_dreg = *buf++;
}
return (0);
}
static int
ixfer_in(hd, len, buf)
volatile register struct scsidevice *hd;
int len;
register u_char *buf;
{
register int wait = scsi_data_wait;
for (; len > 0; --len) {
while (hd->scsi_ssts & SSTS_DREG_EMPTY) {
if (hd->scsi_ints || --wait < 0) {
while (! (hd->scsi_ssts & SSTS_DREG_EMPTY)) {
*buf++ = hd->scsi_dreg;
--len;
}
return (len);
}
DELAY(1);
}
*buf++ = hd->scsi_dreg;
}
return (len);
}
static int
scsiicmd(hs, target, cbuf, clen, buf, len, xferphase)
struct scsi_softc *hs;
int target;
u_char *cbuf;
int clen;
u_char *buf;
int len;
u_char xferphase;
{
volatile register struct scsidevice *hd =
(struct scsidevice *)hs->sc_addr;
u_char phase, ints;
register int wait;
/* select the SCSI bus (it's an error if bus isn't free) */
if (issue_select(hd, target, hs->sc_scsi_addr))
return (-2);
if (wait_for_select(hd))
return (-2);
/*
* Wait for a phase change (or error) then let the device
* sequence us through the various SCSI phases.
*/
hs->sc_stat = -1;
phase = CMD_PHASE;
while (1) {
wait = scsi_cmd_wait;
switch (phase) {
case CMD_PHASE:
if (ixfer_start(hd, clen, phase, wait))
if (ixfer_out(hd, clen, cbuf))
goto abort;
phase = xferphase;
break;
case DATA_IN_PHASE:
if (len <= 0)
goto abort;
wait = scsi_data_wait;
if (ixfer_start(hd, len, phase, wait) ||
!(hd->scsi_ssts & SSTS_DREG_EMPTY))
ixfer_in(hd, len, buf);
phase = STATUS_PHASE;
break;
case DATA_OUT_PHASE:
if (len <= 0)
goto abort;
wait = scsi_data_wait;
if (ixfer_start(hd, len, phase, wait))
if (ixfer_out(hd, len, buf))
goto abort;
phase = STATUS_PHASE;
break;
case STATUS_PHASE:
wait = scsi_data_wait;
if (ixfer_start(hd, sizeof(hs->sc_stat), phase, wait) ||
!(hd->scsi_ssts & SSTS_DREG_EMPTY))
ixfer_in(hd, sizeof(hs->sc_stat), &hs->sc_stat);
phase = MESG_IN_PHASE;
break;
case MESG_IN_PHASE:
if (ixfer_start(hd, sizeof(hs->sc_msg), phase, wait) ||
!(hd->scsi_ssts & SSTS_DREG_EMPTY)) {
ixfer_in(hd, sizeof(hs->sc_msg), &hs->sc_msg);
hd->scsi_scmd = SCMD_RST_ACK;
}
phase = BUS_FREE_PHASE;
break;
case BUS_FREE_PHASE:
goto out;
default:
printf("scsi%d: unexpected scsi phase %d\n",
hs - scsi_softc, phase);
goto abort;
}
#ifdef SLOWSCSI
/*
* XXX we have wierd transient problems with booting from
* slow scsi disks on fast machines. I have never been
* able to pin the problem down, but a large delay here
* seems to always work.
*/
DELAY(1000);
#endif
/* wait for last command to complete */
while ((ints = hd->scsi_ints) == 0) {
if (--wait < 0)
goto abort;
DELAY(1);
}
hd->scsi_ints = ints;
if (ints & INTS_SRV_REQ)
phase = hd->scsi_psns & PHASE;
else if (ints & INTS_DISCON)
goto out;
else if ((ints & INTS_CMD_DONE) == 0)
goto abort;
}
abort:
scsiabort(hs, hd);
out:
return (hs->sc_stat);
}
int
scsi_test_unit_rdy(ctlr, slave)
int ctlr, slave;
{
register struct scsi_softc *hs = &scsi_softc[ctlr];
static struct scsi_cdb6 cdb = { CMD_TEST_UNIT_READY };
return (scsiicmd(hs, slave, &cdb, sizeof(cdb), (u_char *)0, 0,
STATUS_PHASE));
}
int
scsi_request_sense(ctlr, slave, buf, len)
int ctlr, slave;
u_char *buf;
unsigned len;
{
register struct scsi_softc *hs = &scsi_softc[ctlr];
static struct scsi_cdb6 cdb = { CMD_REQUEST_SENSE };
cdb.len = len;
return (scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len,
DATA_IN_PHASE));
}
int
scsi_read_capacity(ctlr, slave, buf, len)
int ctlr, slave;
u_char *buf;
unsigned len;
{
register struct scsi_softc *hs = &scsi_softc[ctlr];
static struct scsi_cdb10 cdb = { CMD_READ_CAPACITY };
return (scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len,
DATA_IN_PHASE));
}
int
scsi_tt_read(ctlr, slave, buf, len, blk, nblk)
int ctlr, slave;
u_char *buf;
u_int len;
daddr_t blk;
u_int nblk;
{
register struct scsi_softc *hs = &scsi_softc[ctlr];
struct scsi_cdb10 cdb;
bzero(&cdb, sizeof(cdb));
cdb.cmd = CMD_READ_EXT;
cdb.lbah = blk >> 24;
cdb.lbahm = blk >> 16;
cdb.lbalm = blk >> 8;
cdb.lbal = blk;
cdb.lenh = nblk >> (8 + DEV_BSHIFT);
cdb.lenl = nblk >> DEV_BSHIFT;
return (scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len,
DATA_IN_PHASE));
}
int
scsi_tt_write(ctlr, slave, buf, len, blk, nblk)
int ctlr, slave;
u_char *buf;
u_int len;
daddr_t blk;
u_int nblk;
{
register struct scsi_softc *hs = &scsi_softc[ctlr];
struct scsi_cdb10 cdb;
bzero(&cdb, sizeof(cdb));
cdb.cmd = CMD_WRITE_EXT;
cdb.lbah = blk >> 24;
cdb.lbahm = blk >> 16;
cdb.lbalm = blk >> 8;
cdb.lbal = blk;
cdb.lenh = nblk >> (8 + DEV_BSHIFT);
cdb.lenl = nblk >> DEV_BSHIFT;
return (scsiicmd(hs, slave, &cdb, sizeof(cdb), buf, len,
DATA_OUT_PHASE));
}