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NetBSD/sys/dev/ic/wdc.c

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/* $NetBSD: wdc.c,v 1.67 1999/04/11 20:50:28 bouyer Exp $ */
/*
* Copyright (c) 1998 Manuel Bouyer. All rights reserved.
*
* 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 Manuel Bouyer.
* 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.
*/
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum, by Onno van der Linden and by Manuel Bouyer.
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* CODE UNTESTED IN THE CURRENT REVISION:
*
*/
#ifndef WDCDEBUG
#define WDCDEBUG
#endif /* WDCDEBUG */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <machine/intr.h>
#include <machine/bus.h>
#ifndef __BUS_SPACE_HAS_STREAM_METHODS
#define bus_space_write_multi_stream_2 bus_space_write_multi_2
#define bus_space_write_multi_stream_4 bus_space_write_multi_4
#define bus_space_read_multi_stream_2 bus_space_read_multi_2
#define bus_space_read_multi_stream_4 bus_space_read_multi_4
#endif /* __BUS_SPACE_HAS_STREAM_METHODS */
#include <dev/ata/atavar.h>
#include <dev/ata/atareg.h>
#include <dev/ic/wdcreg.h>
#include <dev/ic/wdcvar.h>
#include "atapibus.h"
#define WDCDELAY 100 /* 100 microseconds */
#define WDCNDELAY_RST (WDC_RESET_WAIT * 1000 / WDCDELAY)
#if 0
/* If you enable this, it will report any delays more than WDCDELAY * N long. */
#define WDCNDELAY_DEBUG 50
#endif
LIST_HEAD(xfer_free_list, wdc_xfer) xfer_free_list;
static void __wdcerror __P((struct channel_softc*, char *));
static int __wdcwait_reset __P((struct channel_softc *, int));
void __wdccommand_done __P((struct channel_softc *, struct wdc_xfer *));
void __wdccommand_start __P((struct channel_softc *, struct wdc_xfer *));
int __wdccommand_intr __P((struct channel_softc *, struct wdc_xfer *, int));
int wdprint __P((void *, const char *));
#define DEBUG_INTR 0x01
#define DEBUG_XFERS 0x02
#define DEBUG_STATUS 0x04
#define DEBUG_FUNCS 0x08
#define DEBUG_PROBE 0x10
#ifdef WDCDEBUG
int wdcdebug_mask = 0;
int wdc_nxfer = 0;
#define WDCDEBUG_PRINT(args, level) if (wdcdebug_mask & (level)) printf args
#else
#define WDCDEBUG_PRINT(args, level)
#endif
int
wdprint(aux, pnp)
void *aux;
const char *pnp;
{
struct ata_atapi_attach *aa_link = aux;
if (pnp)
printf("drive at %s", pnp);
printf(" channel %d drive %d", aa_link->aa_channel,
aa_link->aa_drv_data->drive);
return (UNCONF);
}
int
atapi_print(aux, pnp)
void *aux;
const char *pnp;
{
struct ata_atapi_attach *aa_link = aux;
if (pnp)
printf("atapibus at %s", pnp);
printf(" channel %d", aa_link->aa_channel);
return (UNCONF);
}
/* Test to see controller with at last one attached drive is there.
* Returns a bit for each possible drive found (0x01 for drive 0,
* 0x02 for drive 1).
* Logic:
* - If a status register is at 0xff, assume there is no drive here
* (ISA has pull-up resistors). If no drive at all -> return.
* - reset the controller, wait for it to complete (may take up to 31s !).
* If timeout -> return.
* - test ATA/ATAPI signatures. If at last one drive found -> return.
* - try an ATA command on the master.
*/
int
wdcprobe(chp)
struct channel_softc *chp;
{
u_int8_t st0, st1, sc, sn, cl, ch;
u_int8_t ret_value = 0x03;
u_int8_t drive;
/*
* Sanity check to see if the wdc channel responds at all.
*/
if (chp->wdc == NULL ||
(chp->wdc->cap & WDC_CAPABILITY_NO_EXTRA_RESETS) == 0) {
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM);
delay(10);
st0 = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_status);
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM | 0x10);
delay(10);
st1 = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_status);
WDCDEBUG_PRINT(("%s:%d: before reset, st0=0x%x, st1=0x%x\n",
chp->wdc ? chp->wdc->sc_dev.dv_xname : "wdcprobe",
chp->channel, st0, st1), DEBUG_PROBE);
if (st0 == 0xff)
ret_value &= ~0x01;
if (st1 == 0xff)
ret_value &= ~0x02;
if (ret_value == 0)
return 0;
}
/* assert SRST, wait for reset to complete */
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM);
delay(10);
bus_space_write_1(chp->ctl_iot, chp->ctl_ioh, wd_aux_ctlr,
WDCTL_RST | WDCTL_IDS);
DELAY(1000);
bus_space_write_1(chp->ctl_iot, chp->ctl_ioh, wd_aux_ctlr,
WDCTL_IDS);
delay(1000);
(void) bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_error);
bus_space_write_1(chp->ctl_iot, chp->ctl_ioh, wd_aux_ctlr, WDCTL_4BIT);
delay(10);
ret_value = __wdcwait_reset(chp, ret_value);
WDCDEBUG_PRINT(("%s:%d: after reset, ret_value=0x%d\n",
chp->wdc ? chp->wdc->sc_dev.dv_xname : "wdcprobe", chp->channel,
ret_value), DEBUG_PROBE);
/* if reset failed, there's nothing here */
if (ret_value == 0)
return 0;
/*
* Test presence of drives. First test register signatures looking for
* ATAPI devices. If it's not an ATAPI and reset said there may be
* something here assume it's ATA or OLD. Ghost will be killed later in
* attach routine.
*/
for (drive = 0; drive < 2; drive++) {
if ((ret_value & (0x01 << drive)) == 0)
continue;
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM | (drive << 4));
delay(10);
/* Save registers contents */
sc = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_seccnt);
sn = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_sector);
cl = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_cyl_lo);
ch = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_cyl_hi);
WDCDEBUG_PRINT(("%s:%d:%d: after reset, sc=0x%x sn=0x%x "
"cl=0x%x ch=0x%x\n",
chp->wdc ? chp->wdc->sc_dev.dv_xname : "wdcprobe",
chp->channel, drive, sc, sn, cl, ch), DEBUG_PROBE);
/*
* sc is supposted to be 0x1 for ATAPI but at last one drive
* set it to 0x0 - or maybe it's the controller.
*/
if ((sc == 0x00 || sc == 0x01) && sn == 0x01 &&
cl == 0x14 && ch == 0xeb) {
chp->ch_drive[drive].drive_flags |= DRIVE_ATAPI;
} else {
chp->ch_drive[drive].drive_flags |= DRIVE_ATA;
if (chp->wdc == NULL ||
(chp->wdc->cap & WDC_CAPABILITY_PREATA) != 0)
chp->ch_drive[drive].drive_flags |= DRIVE_OLD;
}
}
return (ret_value);
}
void
wdcattach(chp)
struct channel_softc *chp;
{
int channel_flags, ctrl_flags, i, error;
struct ata_atapi_attach aa_link;
struct ataparams params;
static int inited = 0;
if ((error = wdc_addref(chp)) != 0) {
printf("%s: unable to enable controller\n",
chp->wdc->sc_dev.dv_xname);
return;
}
if (wdcprobe(chp) == 0) {
/* If no drives, abort attach here. */
wdc_delref(chp);
return;
}
/* init list only once */
if (inited == 0) {
LIST_INIT(&xfer_free_list);
inited++;
}
TAILQ_INIT(&chp->ch_queue->sc_xfer);
for (i = 0; i < 2; i++) {
chp->ch_drive[i].chnl_softc = chp;
chp->ch_drive[i].drive = i;
/* If controller can't do 16bit flag the drives as 32bit */
if ((chp->wdc->cap &
(WDC_CAPABILITY_DATA16 | WDC_CAPABILITY_DATA32)) ==
WDC_CAPABILITY_DATA32)
chp->ch_drive[i].drive_flags |= DRIVE_CAP32;
if ((chp->ch_drive[i].drive_flags & DRIVE) == 0)
continue;
/* Issue a IDENTIFY command, to try to detect slave ghost */
if (ata_get_params(&chp->ch_drive[i], AT_POLL, &params) ==
CMD_OK) {
/* If IDENTIFY succeded, this is not an OLD ctrl */
chp->ch_drive[0].drive_flags &= ~DRIVE_OLD;
chp->ch_drive[1].drive_flags &= ~DRIVE_OLD;
} else {
chp->ch_drive[i].drive_flags &=
~(DRIVE_ATA | DRIVE_ATAPI);
WDCDEBUG_PRINT(("%s:%d:%d: IDENTIFY failed\n",
chp->wdc->sc_dev.dv_xname,
chp->channel, i), DEBUG_PROBE);
if ((chp->ch_drive[i].drive_flags & DRIVE_OLD) == 0)
continue;
/* Pre-ATA drive ? */
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM | (i << 4));
delay(100);
if (wait_for_ready(chp, 10000) != 0) {
WDCDEBUG_PRINT(("%s:%d:%d: not ready\n",
chp->wdc->sc_dev.dv_xname,
chp->channel, i), DEBUG_PROBE);
chp->ch_drive[i].drive_flags &= ~DRIVE_OLD;
continue;
}
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh,
wd_command, WDCC_RECAL);
if (wait_for_ready(chp, 10000) != 0) {
WDCDEBUG_PRINT(("%s:%d:%d: WDCC_RECAL failed\n",
chp->wdc->sc_dev.dv_xname,
chp->channel, i), DEBUG_PROBE);
chp->ch_drive[i].drive_flags &= ~DRIVE_OLD;
}
}
}
ctrl_flags = chp->wdc->sc_dev.dv_cfdata->cf_flags;
channel_flags = (ctrl_flags >> (NBBY * chp->channel)) & 0xff;
WDCDEBUG_PRINT(("wdcattach: ch_drive_flags 0x%x 0x%x\n",
chp->ch_drive[0].drive_flags, chp->ch_drive[1].drive_flags),
DEBUG_PROBE);
/* If no drives, abort here */
if ((chp->ch_drive[0].drive_flags & DRIVE) == 0 &&
(chp->ch_drive[1].drive_flags & DRIVE) == 0)
return;
/*
* Attach an ATAPI bus, if needed.
*/
if ((chp->ch_drive[0].drive_flags & DRIVE_ATAPI) ||
(chp->ch_drive[1].drive_flags & DRIVE_ATAPI)) {
#if NATAPIBUS > 0
wdc_atapibus_attach(chp);
#else
/*
* Fills in a fake aa_link and call config_found, so that
* the config machinery will print
* "atapibus at xxx not configured"
*/
memset(&aa_link, 0, sizeof(struct ata_atapi_attach));
aa_link.aa_type = T_ATAPI;
aa_link.aa_channel = chp->channel;
aa_link.aa_openings = 1;
aa_link.aa_drv_data = 0;
aa_link.aa_bus_private = NULL;
(void)config_found(&chp->wdc->sc_dev, (void *)&aa_link,
atapi_print);
#endif
}
for (i = 0; i < 2; i++) {
if ((chp->ch_drive[i].drive_flags &
(DRIVE_ATA | DRIVE_OLD)) == 0) {
continue;
}
memset(&aa_link, 0, sizeof(struct ata_atapi_attach));
aa_link.aa_type = T_ATA;
aa_link.aa_channel = chp->channel;
aa_link.aa_openings = 1;
aa_link.aa_drv_data = &chp->ch_drive[i];
if (config_found(&chp->wdc->sc_dev, (void *)&aa_link, wdprint))
wdc_probe_caps(&chp->ch_drive[i]);
}
/*
* reset drive_flags for unnatached devices, reset state for attached
* ones
*/
for (i = 0; i < 2; i++) {
if (chp->ch_drive[i].drv_softc == NULL)
chp->ch_drive[i].drive_flags = 0;
else
chp->ch_drive[i].state = 0;
}
/*
* Reset channel. The probe, with some combinations of ATA/ATAPI
* devices keep it in a mostly working, but strange state (with busy
* led on)
*/
if ((chp->wdc->cap & WDC_CAPABILITY_NO_EXTRA_RESETS) == 0) {
wdcreset(chp, VERBOSE);
/*
* Read status registers to avoid spurious interrupts.
*/
for (i = 1; i >= 0; i--) {
if (chp->ch_drive[i].drive_flags & DRIVE) {
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh,
wd_sdh, WDSD_IBM | (i << 4));
if (wait_for_unbusy(chp, 10000) < 0)
printf("%s:%d:%d: device busy\n",
chp->wdc->sc_dev.dv_xname,
chp->channel, i);
}
}
}
wdc_delref(chp);
}
/*
* Start I/O on a controller, for the given channel.
* The first xfer may be not for our channel if the channel queues
* are shared.
*/
void
wdcstart(chp)
struct channel_softc *chp;
{
struct wdc_xfer *xfer;
#ifdef WDC_DIAGNOSTIC
int spl1, spl2;
spl1 = splbio();
spl2 = splbio();
if (spl2 != spl1) {
printf("wdcstart: not at splbio()\n");
panic("wdcstart");
}
splx(spl2);
splx(spl1);
#endif /* WDC_DIAGNOSTIC */
/* is there a xfer ? */
if ((xfer = chp->ch_queue->sc_xfer.tqh_first) == NULL)
return;
/* adjust chp, in case we have a shared queue */
chp = xfer->chp;
if ((chp->ch_flags & WDCF_ACTIVE) != 0 ) {
return; /* channel aleady active */
}
#ifdef DIAGNOSTIC
if ((chp->ch_flags & WDCF_IRQ_WAIT) != 0)
panic("wdcstart: channel waiting for irq\n");
#endif
if (chp->wdc->cap & WDC_CAPABILITY_HWLOCK)
if (!(*chp->wdc->claim_hw)(chp, 0))
return;
WDCDEBUG_PRINT(("wdcstart: xfer %p channel %d drive %d\n", xfer,
chp->channel, xfer->drive), DEBUG_XFERS);
chp->ch_flags |= WDCF_ACTIVE;
if (chp->ch_drive[xfer->drive].drive_flags & DRIVE_RESET) {
chp->ch_drive[xfer->drive].drive_flags &= ~DRIVE_RESET;
chp->ch_drive[xfer->drive].state = 0;
}
xfer->c_start(chp, xfer);
}
/* restart an interrupted I/O */
void
wdcrestart(v)
void *v;
{
struct channel_softc *chp = v;
int s;
s = splbio();
wdcstart(chp);
splx(s);
}
/*
* Interrupt routine for the controller. Acknowledge the interrupt, check for
* errors on the current operation, mark it done if necessary, and start the
* next request. Also check for a partially done transfer, and continue with
* the next chunk if so.
*/
int
wdcintr(arg)
void *arg;
{
struct channel_softc *chp = arg;
struct wdc_xfer *xfer;
if ((chp->ch_flags & WDCF_IRQ_WAIT) == 0) {
WDCDEBUG_PRINT(("wdcintr: inactive controller\n"), DEBUG_INTR);
return 0;
}
WDCDEBUG_PRINT(("wdcintr\n"), DEBUG_INTR);
untimeout(wdctimeout, chp);
chp->ch_flags &= ~WDCF_IRQ_WAIT;
xfer = chp->ch_queue->sc_xfer.tqh_first;
return xfer->c_intr(chp, xfer, 1);
}
/* Put all disk in RESET state */
void wdc_reset_channel(drvp)
struct ata_drive_datas *drvp;
{
struct channel_softc *chp = drvp->chnl_softc;
int drive;
WDCDEBUG_PRINT(("ata_reset_channel %s:%d for drive %d\n",
chp->wdc->sc_dev.dv_xname, chp->channel, drvp->drive),
DEBUG_FUNCS);
(void) wdcreset(chp, VERBOSE);
for (drive = 0; drive < 2; drive++) {
chp->ch_drive[drive].state = 0;
}
}
int
wdcreset(chp, verb)
struct channel_softc *chp;
int verb;
{
int drv_mask1, drv_mask2;
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM); /* master */
bus_space_write_1(chp->ctl_iot, chp->ctl_ioh, wd_aux_ctlr,
WDCTL_RST | WDCTL_IDS);
delay(1000);
bus_space_write_1(chp->ctl_iot, chp->ctl_ioh, wd_aux_ctlr,
WDCTL_IDS);
delay(1000);
(void) bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_error);
bus_space_write_1(chp->ctl_iot, chp->ctl_ioh, wd_aux_ctlr,
WDCTL_4BIT);
drv_mask1 = (chp->ch_drive[0].drive_flags & DRIVE) ? 0x01:0x00;
drv_mask1 |= (chp->ch_drive[1].drive_flags & DRIVE) ? 0x02:0x00;
drv_mask2 = __wdcwait_reset(chp, drv_mask1);
if (verb && drv_mask2 != drv_mask1) {
printf("%s channel %d: reset failed for",
chp->wdc->sc_dev.dv_xname, chp->channel);
if ((drv_mask1 & 0x01) != 0 && (drv_mask2 & 0x01) == 0)
printf(" drive 0");
if ((drv_mask1 & 0x02) != 0 && (drv_mask2 & 0x02) == 0)
printf(" drive 1");
printf("\n");
}
return (drv_mask1 != drv_mask2) ? 1 : 0;
}
static int
__wdcwait_reset(chp, drv_mask)
struct channel_softc *chp;
int drv_mask;
{
int timeout;
u_int8_t st0, st1;
/* wait for BSY to deassert */
for (timeout = 0; timeout < WDCNDELAY_RST;timeout++) {
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM); /* master */
delay(10);
st0 = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_status);
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM | 0x10); /* slave */
delay(10);
st1 = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_status);
if ((drv_mask & 0x01) == 0) {
/* no master */
if ((drv_mask & 0x02) != 0 && (st1 & WDCS_BSY) == 0) {
/* No master, slave is ready, it's done */
goto end;
}
} else if ((drv_mask & 0x02) == 0) {
/* no slave */
if ((drv_mask & 0x01) != 0 && (st0 & WDCS_BSY) == 0) {
/* No slave, master is ready, it's done */
goto end;
}
} else {
/* Wait for both master and slave to be ready */
if ((st0 & WDCS_BSY) == 0 && (st1 & WDCS_BSY) == 0) {
goto end;
}
}
delay(WDCDELAY);
}
/* Reset timed out. Maybe it's because drv_mask was not rigth */
if (st0 & WDCS_BSY)
drv_mask &= ~0x01;
if (st1 & WDCS_BSY)
drv_mask &= ~0x02;
end:
WDCDEBUG_PRINT(("%s:%d: wdcwait_reset() end, st0=0x%x, st1=0x%x\n",
chp->wdc ? chp->wdc->sc_dev.dv_xname : "wdcprobe", chp->channel,
st0, st1), DEBUG_PROBE);
return drv_mask;
}
/*
* Wait for a drive to be !BSY, and have mask in its status register.
* return -1 for a timeout after "timeout" ms.
*/
int
wdcwait(chp, mask, bits, timeout)
struct channel_softc *chp;
int mask, bits, timeout;
{
u_char status;
int time = 0;
#ifdef WDCNDELAY_DEBUG
extern int cold;
#endif
WDCDEBUG_PRINT(("wdcwait %s:%d\n", chp->wdc ?chp->wdc->sc_dev.dv_xname
:"none", chp->channel), DEBUG_STATUS);
chp->ch_error = 0;
timeout = timeout * 1000 / WDCDELAY; /* delay uses microseconds */
for (;;) {
chp->ch_status = status =
bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_status);
if ((status & WDCS_BSY) == 0 && (status & mask) == bits)
break;
if (++time > timeout) {
WDCDEBUG_PRINT(("wdcwait: timeout, status %x "
"error %x\n", status,
bus_space_read_1(chp->cmd_iot, chp->cmd_ioh,
wd_error)),
DEBUG_STATUS);
return -1;
}
delay(WDCDELAY);
}
if (status & WDCS_ERR)
chp->ch_error = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh,
wd_error);
#ifdef WDCNDELAY_DEBUG
/* After autoconfig, there should be no long delays. */
if (!cold && time > WDCNDELAY_DEBUG) {
struct wdc_xfer *xfer = chp->ch_queue->sc_xfer.tqh_first;
if (xfer == NULL)
printf("%s channel %d: warning: busy-wait took %dus\n",
chp->wdc->sc_dev.dv_xname, chp->channel,
WDCDELAY * time);
else
printf("%s:%d:%d: warning: busy-wait took %dus\n",
chp->wdc->sc_dev.dv_xname, chp->channel,
xfer->drive,
WDCDELAY * time);
}
#endif
return 0;
}
void
wdctimeout(arg)
void *arg;
{
struct channel_softc *chp = (struct channel_softc *)arg;
struct wdc_xfer *xfer = chp->ch_queue->sc_xfer.tqh_first;
int s;
WDCDEBUG_PRINT(("wdctimeout\n"), DEBUG_FUNCS);
s = splbio();
if ((chp->ch_flags & WDCF_IRQ_WAIT) != 0) {
__wdcerror(chp, "lost interrupt");
printf("\ttype: %s\n", (xfer->c_flags & C_ATAPI) ?
"atapi":"ata");
printf("\tc_bcount: %d\n", xfer->c_bcount);
printf("\tc_skip: %d\n", xfer->c_skip);
/*
* Call the interrupt routine. If we just missed and interrupt,
* it will do what's needed. Else, it will take the needed
* action (reset the device).
*/
xfer->c_flags |= C_TIMEOU;
chp->ch_flags &= ~WDCF_IRQ_WAIT;
xfer->c_intr(chp, xfer, 1);
} else
__wdcerror(chp, "missing untimeout");
splx(s);
}
/*
* Probe drive's capabilites, for use by the controller later
* Assumes drvp points to an existing drive.
* XXX this should be a controller-indep function
*/
void
wdc_probe_caps(drvp)
struct ata_drive_datas *drvp;
{
struct ataparams params, params2;
struct channel_softc *chp = drvp->chnl_softc;
struct device *drv_dev = drvp->drv_softc;
struct wdc_softc *wdc = chp->wdc;
int i, printed;
char *sep = "";
int cf_flags;
if (ata_get_params(drvp, AT_POLL, &params) != CMD_OK) {
/* IDENTIFY failed. Can't tell more about the device */
return;
}
if ((wdc->cap & (WDC_CAPABILITY_DATA16 | WDC_CAPABILITY_DATA32)) ==
(WDC_CAPABILITY_DATA16 | WDC_CAPABILITY_DATA32)) {
/*
* Controller claims 16 and 32 bit transfers.
* Re-do an IDENTIFY with 32-bit transfers,
* and compare results.
*/
drvp->drive_flags |= DRIVE_CAP32;
ata_get_params(drvp, AT_POLL, &params2);
if (memcmp(&params, &params2, sizeof(struct ataparams)) != 0) {
/* Not good. fall back to 16bits */
drvp->drive_flags &= ~DRIVE_CAP32;
} else {
printf("%s: 32-bits data port", drv_dev->dv_xname);
}
}
#if 0 /* Some ultra-DMA drives claims to only support ATA-3. sigh */
if (params.atap_ata_major > 0x01 &&
params.atap_ata_major != 0xffff) {
for (i = 14; i > 0; i--) {
if (params.atap_ata_major & (1 << i)) {
if ((drvp->drive_flags & DRIVE_CAP32) == 0)
printf("%s: ", drv_dev->dv_xname);
else
printf(", ");
printf("ATA version %d\n", i);
drvp->ata_vers = i;
break;
}
}
} else
#endif
if (drvp->drive_flags & DRIVE_CAP32)
printf("\n");
/* An ATAPI device is at last PIO mode 3 */
if (drvp->drive_flags & DRIVE_ATAPI)
drvp->PIO_mode = 3;
/*
* It's not in the specs, but it seems that some drive
* returns 0xffff in atap_extensions when this field is invalid
*/
if (params.atap_extensions != 0xffff &&
(params.atap_extensions & WDC_EXT_MODES)) {
printed = 0;
/*
* XXX some drives report something wrong here (they claim to
* support PIO mode 8 !). As mode is coded on 3 bits in
* SET FEATURE, limit it to 7 (so limit i to 4).
* If higther mode than 7 is found, abort.
*/
for (i = 7; i >= 0; i--) {
if ((params.atap_piomode_supp & (1 << i)) == 0)
continue;
if (i > 4)
return;
/*
* See if mode is accepted.
* If the controller can't set its PIO mode,
* assume the defaults are good, so don't try
* to set it
*/
if ((wdc->cap & WDC_CAPABILITY_MODE) != 0)
if (ata_set_mode(drvp, 0x08 | (i + 3),
AT_POLL) != CMD_OK)
continue;
if (!printed) {
printf("%s: drive supports PIO mode %d",
drv_dev->dv_xname, i + 3);
sep = ",";
printed = 1;
}
/*
* If controller's driver can't set its PIO mode,
* get the highter one for the drive.
*/
if ((wdc->cap & WDC_CAPABILITY_MODE) == 0 ||
wdc->PIO_cap >= i + 3) {
drvp->PIO_mode = i + 3;
drvp->PIO_cap = i + 3;
break;
}
}
if (!printed) {
/*
* We didn't find a valid PIO mode.
* Assume the values returned for DMA are buggy too
*/
return;
}
drvp->drive_flags |= DRIVE_MODE;
printed = 0;
for (i = 7; i >= 0; i--) {
if ((params.atap_dmamode_supp & (1 << i)) == 0)
continue;
if ((wdc->cap & WDC_CAPABILITY_DMA) &&
(wdc->cap & WDC_CAPABILITY_MODE))
if (ata_set_mode(drvp, 0x20 | i, AT_POLL)
!= CMD_OK)
continue;
if (!printed) {
printf("%s DMA mode %d", sep, i);
sep = ",";
printed = 1;
}
if (wdc->cap & WDC_CAPABILITY_DMA) {
if ((wdc->cap & WDC_CAPABILITY_MODE) &&
wdc->DMA_cap < i)
continue;
drvp->DMA_mode = i;
drvp->DMA_cap = i;
drvp->drive_flags |= DRIVE_DMA;
}
break;
}
if (params.atap_extensions & WDC_EXT_UDMA_MODES) {
for (i = 7; i >= 0; i--) {
if ((params.atap_udmamode_supp & (1 << i))
== 0)
continue;
if ((wdc->cap & WDC_CAPABILITY_MODE) &&
(wdc->cap & WDC_CAPABILITY_UDMA))
if (ata_set_mode(drvp, 0x40 | i,
AT_POLL) != CMD_OK)
continue;
printf("%s Ultra-DMA mode %d", sep, i);
sep = ",";
if (wdc->cap & WDC_CAPABILITY_UDMA) {
if ((wdc->cap & WDC_CAPABILITY_MODE) &&
wdc->UDMA_cap < i)
continue;
drvp->UDMA_mode = i;
drvp->UDMA_cap = i;
drvp->drive_flags |= DRIVE_UDMA;
}
break;
}
}
printf("\n");
}
/* Try to guess ATA version here, if it didn't get reported */
if (drvp->ata_vers == 0) {
if (drvp->drive_flags & DRIVE_UDMA)
drvp->ata_vers = 4; /* should be at last ATA-4 */
else if (drvp->PIO_cap > 2)
drvp->ata_vers = 2; /* should be at last ATA-2 */
}
cf_flags = drv_dev->dv_cfdata->cf_flags;
if (cf_flags & ATA_CONFIG_PIO_SET) {
drvp->PIO_mode =
(cf_flags & ATA_CONFIG_PIO_MODES) >> ATA_CONFIG_PIO_OFF;
drvp->drive_flags |= DRIVE_MODE;
}
if ((wdc->cap & WDC_CAPABILITY_DMA) == 0) {
/* don't care about DMA modes */
return;
}
if (cf_flags & ATA_CONFIG_DMA_SET) {
if ((cf_flags & ATA_CONFIG_DMA_MODES) ==
ATA_CONFIG_DMA_DISABLE) {
drvp->drive_flags &= ~DRIVE_DMA;
} else {
drvp->DMA_mode = (cf_flags & ATA_CONFIG_DMA_MODES) >>
ATA_CONFIG_DMA_OFF;
drvp->drive_flags |= DRIVE_DMA | DRIVE_MODE;
}
}
if (cf_flags & ATA_CONFIG_UDMA_SET) {
if ((cf_flags & ATA_CONFIG_UDMA_MODES) ==
ATA_CONFIG_UDMA_DISABLE) {
drvp->drive_flags &= ~DRIVE_UDMA;
} else {
drvp->UDMA_mode = (cf_flags & ATA_CONFIG_UDMA_MODES) >>
ATA_CONFIG_UDMA_OFF;
drvp->drive_flags |= DRIVE_UDMA | DRIVE_MODE;
}
}
}
/*
* downgrade the transfer mode of a drive after an error. return 1 if
* downgrade was possible, 0 otherwise.
*/
int
wdc_downgrade_mode(drvp)
struct ata_drive_datas *drvp;
{
struct channel_softc *chp = drvp->chnl_softc;
struct device *drv_dev = drvp->drv_softc;
struct wdc_softc *wdc = chp->wdc;
int cf_flags = drv_dev->dv_cfdata->cf_flags;
/* if drive or controller don't know its mode, we can't do much */
if ((drvp->drive_flags & DRIVE_MODE) == 0 ||
(wdc->cap & WDC_CAPABILITY_MODE) == 0)
return 0;
/* current drive mode was set by a config flag, let it this way */
if ((cf_flags & ATA_CONFIG_PIO_SET) ||
(cf_flags & ATA_CONFIG_DMA_SET) ||
(cf_flags & ATA_CONFIG_UDMA_SET))
return 0;
/*
* If we were using ultra-DMA, don't downgrade to multiword DMA
* if we noticed a CRC error. It has been noticed that CRC errors
* in ultra-DMA lead to silent data corruption in multiword DMA.
* Data corruption is less likely to occur in PIO mode.
*/
if ((drvp->drive_flags & DRIVE_UDMA) &&
(drvp->drive_flags & DRIVE_DMAERR) == 0) {
drvp->drive_flags &= ~DRIVE_UDMA;
drvp->drive_flags |= DRIVE_DMA;
drvp->DMA_mode = drvp->DMA_cap;
printf("%s: transfer error, downgrading to DMA mode %d\n",
drv_dev->dv_xname, drvp->DMA_mode);
} else if (drvp->drive_flags & (DRIVE_DMA | DRIVE_UDMA)) {
drvp->drive_flags &= ~(DRIVE_DMA | DRIVE_UDMA);
drvp->PIO_mode = drvp->PIO_cap;
printf("%s: transfer error, downgrading to PIO mode %d\n",
drv_dev->dv_xname, drvp->PIO_mode);
} else /* already using PIO, can't downgrade */
return 0;
wdc->set_modes(chp);
/* reset the channel, which will shedule all drives for setup */
wdc_reset_channel(drvp);
return 1;
}
int
wdc_exec_command(drvp, wdc_c)
struct ata_drive_datas *drvp;
struct wdc_command *wdc_c;
{
struct channel_softc *chp = drvp->chnl_softc;
struct wdc_xfer *xfer;
int s, ret;
WDCDEBUG_PRINT(("wdc_exec_command %s:%d:%d\n",
chp->wdc->sc_dev.dv_xname, chp->channel, drvp->drive),
DEBUG_FUNCS);
/* set up an xfer and queue. Wait for completion */
xfer = wdc_get_xfer(wdc_c->flags & AT_WAIT ? WDC_CANSLEEP :
WDC_NOSLEEP);
if (xfer == NULL) {
return WDC_TRY_AGAIN;
}
if (wdc_c->flags & AT_POLL)
xfer->c_flags |= C_POLL;
xfer->drive = drvp->drive;
xfer->databuf = wdc_c->data;
xfer->c_bcount = wdc_c->bcount;
xfer->cmd = wdc_c;
xfer->c_start = __wdccommand_start;
xfer->c_intr = __wdccommand_intr;
s = splbio();
wdc_exec_xfer(chp, xfer);
#ifdef DIAGNOSTIC
if ((wdc_c->flags & AT_POLL) != 0 &&
(wdc_c->flags & AT_DONE) == 0)
panic("wdc_exec_command: polled command not done\n");
#endif
if (wdc_c->flags & AT_DONE) {
ret = WDC_COMPLETE;
} else {
if (wdc_c->flags & AT_WAIT) {
tsleep(wdc_c, PRIBIO, "wdccmd", 0);
ret = WDC_COMPLETE;
} else {
ret = WDC_QUEUED;
}
}
splx(s);
return ret;
}
void
__wdccommand_start(chp, xfer)
struct channel_softc *chp;
struct wdc_xfer *xfer;
{
int drive = xfer->drive;
struct wdc_command *wdc_c = xfer->cmd;
WDCDEBUG_PRINT(("__wdccommand_start %s:%d:%d\n",
chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive),
DEBUG_FUNCS);
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM | (drive << 4));
if (wdcwait(chp, wdc_c->r_st_bmask, wdc_c->r_st_bmask,
wdc_c->timeout) != 0) {
wdc_c->flags |= AT_TIMEOU;
__wdccommand_done(chp, xfer);
return;
}
wdccommand(chp, drive, wdc_c->r_command, wdc_c->r_cyl, wdc_c->r_head,
wdc_c->r_sector, wdc_c->r_count, wdc_c->r_precomp);
if ((wdc_c->flags & AT_POLL) == 0) {
chp->ch_flags |= WDCF_IRQ_WAIT; /* wait for interrupt */
timeout(wdctimeout, chp, wdc_c->timeout / 1000 * hz);
return;
}
/*
* Polled command. Wait for drive ready or drq. Done in intr().
* Wait for at last 400ns for status bit to be valid.
*/
delay(10);
__wdccommand_intr(chp, xfer, 0);
}
int
__wdccommand_intr(chp, xfer, irq)
struct channel_softc *chp;
struct wdc_xfer *xfer;
int irq;
{
struct wdc_command *wdc_c = xfer->cmd;
int bcount = wdc_c->bcount;
char *data = wdc_c->data;
WDCDEBUG_PRINT(("__wdccommand_intr %s:%d:%d\n",
chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive), DEBUG_INTR);
if (wdcwait(chp, wdc_c->r_st_pmask, wdc_c->r_st_pmask,
(irq == 0) ? wdc_c->timeout : 0)) {
if (irq && (xfer->c_flags & C_TIMEOU) == 0)
return 0; /* IRQ was not for us */
wdc_c->flags |= AT_TIMEOU;
__wdccommand_done(chp, xfer);
return 1;
}
if (wdc_c->flags & AT_READ) {
if (chp->ch_drive[xfer->drive].drive_flags & DRIVE_CAP32) {
bus_space_read_multi_4(chp->data32iot, chp->data32ioh,
0, (u_int32_t*)data, bcount >> 2);
data += bcount & 0xfffffffc;
bcount = bcount & 0x03;
}
if (bcount > 0)
bus_space_read_multi_2(chp->cmd_iot, chp->cmd_ioh,
wd_data, (u_int16_t *)data, bcount >> 1);
} else if (wdc_c->flags & AT_WRITE) {
if (chp->ch_drive[xfer->drive].drive_flags & DRIVE_CAP32) {
bus_space_write_multi_4(chp->data32iot, chp->data32ioh,
0, (u_int32_t*)data, bcount >> 2);
data += bcount & 0xfffffffc;
bcount = bcount & 0x03;
}
if (bcount > 0)
bus_space_write_multi_2(chp->cmd_iot, chp->cmd_ioh,
wd_data, (u_int16_t *)data, bcount >> 1);
}
__wdccommand_done(chp, xfer);
return 1;
}
void
__wdccommand_done(chp, xfer)
struct channel_softc *chp;
struct wdc_xfer *xfer;
{
int needdone = xfer->c_flags & C_NEEDDONE;
struct wdc_command *wdc_c = xfer->cmd;
WDCDEBUG_PRINT(("__wdccommand_done %s:%d:%d\n",
chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive), DEBUG_FUNCS);
if (chp->ch_status & WDCS_DWF)
wdc_c->flags |= AT_DF;
if (chp->ch_status & WDCS_ERR) {
wdc_c->flags |= AT_ERROR;
wdc_c->r_error = chp->ch_error;
}
wdc_c->flags |= AT_DONE;
if (wdc_c->flags & AT_READREG && (wdc_c->flags & (AT_ERROR | AT_DF))
== 0) {
wdc_c->r_head = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh,
wd_sdh);
wdc_c->r_cyl = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh,
wd_cyl_hi) << 8;
wdc_c->r_cyl |= bus_space_read_1(chp->cmd_iot, chp->cmd_ioh,
wd_cyl_lo);
wdc_c->r_sector = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh,
wd_sector);
wdc_c->r_count = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh,
wd_seccnt);
wdc_c->r_error = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh,
wd_error);
wdc_c->r_precomp = bus_space_read_1(chp->cmd_iot, chp->cmd_ioh,
wd_precomp);
}
wdc_free_xfer(chp, xfer);
if (needdone) {
if (wdc_c->flags & AT_WAIT)
wakeup(wdc_c);
else
wdc_c->callback(wdc_c->callback_arg);
}
wdcstart(chp);
return;
}
/*
* Send a command. The drive should be ready.
* Assumes interrupts are blocked.
*/
void
wdccommand(chp, drive, command, cylin, head, sector, count, precomp)
struct channel_softc *chp;
u_int8_t drive;
u_int8_t command;
u_int16_t cylin;
u_int8_t head, sector, count, precomp;
{
WDCDEBUG_PRINT(("wdccommand %s:%d:%d: command=0x%x cylin=%d head=%d "
"sector=%d count=%d precomp=%d\n", chp->wdc->sc_dev.dv_xname,
chp->channel, drive, command, cylin, head, sector, count, precomp),
DEBUG_FUNCS);
/* Select drive, head, and addressing mode. */
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM | (drive << 4) | head);
/* Load parameters. wd_features(ATA/ATAPI) = wd_precomp(ST506) */
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_precomp,
precomp);
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_cyl_lo, cylin);
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_cyl_hi, cylin >> 8);
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sector, sector);
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_seccnt, count);
/* Send command. */
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_command, command);
return;
}
/*
* Simplified version of wdccommand(). Unbusy/ready/drq must be
* tested by the caller.
*/
void
wdccommandshort(chp, drive, command)
struct channel_softc *chp;
int drive;
int command;
{
WDCDEBUG_PRINT(("wdccommandshort %s:%d:%d command 0x%x\n",
chp->wdc->sc_dev.dv_xname, chp->channel, drive, command),
DEBUG_FUNCS);
/* Select drive. */
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_sdh,
WDSD_IBM | (drive << 4));
bus_space_write_1(chp->cmd_iot, chp->cmd_ioh, wd_command, command);
}
/* Add a command to the queue and start controller. Must be called at splbio */
void
wdc_exec_xfer(chp, xfer)
struct channel_softc *chp;
struct wdc_xfer *xfer;
{
WDCDEBUG_PRINT(("wdc_exec_xfer %p channel %d drive %d\n", xfer,
chp->channel, xfer->drive), DEBUG_XFERS);
/* complete xfer setup */
xfer->chp = chp;
/*
* If we are a polled command, and the list is not empty,
* we are doing a dump. Drop the list to allow the polled command
* to complete, we're going to reboot soon anyway.
*/
if ((xfer->c_flags & C_POLL) != 0 &&
chp->ch_queue->sc_xfer.tqh_first != NULL) {
TAILQ_INIT(&chp->ch_queue->sc_xfer);
}
/* insert at the end of command list */
TAILQ_INSERT_TAIL(&chp->ch_queue->sc_xfer,xfer , c_xferchain);
WDCDEBUG_PRINT(("wdcstart from wdc_exec_xfer, flags 0x%x\n",
chp->ch_flags), DEBUG_XFERS);
wdcstart(chp);
xfer->c_flags |= C_NEEDDONE; /* we can now call upper level done() */
}
struct wdc_xfer *
wdc_get_xfer(flags)
int flags;
{
struct wdc_xfer *xfer;
int s;
s = splbio();
if ((xfer = xfer_free_list.lh_first) != NULL) {
LIST_REMOVE(xfer, free_list);
splx(s);
#ifdef DIAGNOSTIC
if ((xfer->c_flags & C_INUSE) != 0)
panic("wdc_get_xfer: xfer already in use\n");
#endif
} else {
splx(s);
WDCDEBUG_PRINT(("wdc:making xfer %d\n",wdc_nxfer), DEBUG_XFERS);
xfer = malloc(sizeof(*xfer), M_DEVBUF,
((flags & WDC_NOSLEEP) != 0 ? M_NOWAIT : M_WAITOK));
if (xfer == NULL)
return 0;
#ifdef DIAGNOSTIC
xfer->c_flags &= ~C_INUSE;
#endif
#ifdef WDCDEBUG
wdc_nxfer++;
#endif
}
#ifdef DIAGNOSTIC
if ((xfer->c_flags & C_INUSE) != 0)
panic("wdc_get_xfer: xfer already in use\n");
#endif
memset(xfer, 0, sizeof(struct wdc_xfer));
xfer->c_flags = C_INUSE;
return xfer;
}
void
wdc_free_xfer(chp, xfer)
struct channel_softc *chp;
struct wdc_xfer *xfer;
{
struct wdc_softc *wdc = chp->wdc;
int s;
if (wdc->cap & WDC_CAPABILITY_HWLOCK)
(*wdc->free_hw)(chp);
s = splbio();
chp->ch_flags &= ~WDCF_ACTIVE;
TAILQ_REMOVE(&chp->ch_queue->sc_xfer, xfer, c_xferchain);
xfer->c_flags &= ~C_INUSE;
LIST_INSERT_HEAD(&xfer_free_list, xfer, free_list);
splx(s);
}
static void
__wdcerror(chp, msg)
struct channel_softc *chp;
char *msg;
{
struct wdc_xfer *xfer = chp->ch_queue->sc_xfer.tqh_first;
if (xfer == NULL)
printf("%s:%d: %s\n", chp->wdc->sc_dev.dv_xname, chp->channel,
msg);
else
printf("%s:%d:%d: %s\n", chp->wdc->sc_dev.dv_xname,
chp->channel, xfer->drive, msg);
}
/*
* the bit bucket
*/
void
wdcbit_bucket(chp, size)
struct channel_softc *chp;
int size;
{
for (; size >= 2; size -= 2)
(void)bus_space_read_2(chp->cmd_iot, chp->cmd_ioh, wd_data);
if (size)
(void)bus_space_read_1(chp->cmd_iot, chp->cmd_ioh, wd_data);
}
int
wdc_addref(chp)
struct channel_softc *chp;
{
struct wdc_softc *wdc = chp->wdc;
struct scsipi_adapter *adapter = &wdc->sc_atapi_adapter;
int s, error = 0;
s = splbio();
if (adapter->scsipi_refcnt++ == 0 &&
adapter->scsipi_enable != NULL) {
error = (*adapter->scsipi_enable)(wdc, 1);
if (error)
adapter->scsipi_refcnt--;
}
splx(s);
return (error);
}
void
wdc_delref(chp)
struct channel_softc *chp;
{
struct wdc_softc *wdc = chp->wdc;
struct scsipi_adapter *adapter = &wdc->sc_atapi_adapter;
int s;
s = splbio();
if (adapter->scsipi_refcnt-- == 1 &&
adapter->scsipi_enable != NULL)
(void) (*adapter->scsipi_enable)(wdc, 0);
splx(s);
}
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