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e7580e9536
freebsd-skq/sys/i386/scsi/aic7xxx.c
gibbs e7580e9536 Correct a botched commit from yesturday. It helps to bring over the 
right patch file.<sigh>
1996-05-23 15:02:18 +00:00

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/*
* Generic driver for the aic7xxx based adaptec SCSI controllers
* Product specific probe and attach routines can be found in:
* i386/eisa/aic7770.c 27/284X and aic7770 motherboard controllers
* pci/aic7870.c 3940, 2940, aic7870 and aic7850 controllers
*
* Copyright (c) 1994, 1995, 1996 Justin T. Gibbs.
* 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 immediately at the beginning of the file, without modification,
* 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. 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 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 AUTHOR 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.
*
* $Id: aic7xxx.c,v 1.69 1996/05/22 15:32:28 gibbs Exp $
*/
/*
* TODO:
* Implement Target Mode
*
* A few notes on how SCB paging works...
*
* SCB paging takes advantage of the fact that devices stay disconnected
* from the bus a relatively long time and that while they're disconnected,
* having the SCBs for that device down on the host adapter is of little use.
* Instead we copy the SCB back up into kernel memory and reuse the SCB slot
* on the card to schedule another transaction. This can be a real payoff
* when doing random I/O to tagged queueing devices since there are more
* transactions active at once for the device to sort for optimal seek
* reduction. The algorithm goes like this...
*
* At the sequencer level:
* 1) Disconnected SCBs are threaded onto a doubly linked list, headed by
* DISCONNECTED_SCBH using the SCB_NEXT and SCB_PREV fields. The most
* recently disconnected device is always at the head.
*
* 2) The SCB has an added field SCB_TAG that corresponds to the kernel
* SCB number (ie 0-254).
*
* 3) When a command is queued, the hardware index of the SCB it was downloaded
* into is placed into the QINFIFO for easy indexing by the sequencer.
*
* 4) The tag field is used as the tag for tagged-queueing, for determining
* the related kernel SCB, and is the value put into the QOUTFIFO
* so the kernel doesn't have to upload the SCB to determine the kernel SCB
* that completed on command completes.
*
* 5) When a reconnect occurs, the sequencer must scan the SCB array (even
* in the tag case) looking for the appropriate SCB and if it can't find
* it, it interrupts the kernel so it can page the SCB in.
*
* 6) If the sequencer is successful in finding the SCB, it removes it from
* the doubly linked list of disconnected SCBS.
*
* At the kernel level:
* 1) There are four queues that a kernel SCB may reside on:
* free_scbs - SCBs that are not in use and have a hardware slot assigned
* to them.
* page_scbs - SCBs that are not in use and need to have a hardware slot
* assigned to them (i.e. they will most likely cause a page
* out event).
* waiting_scbs - SCBs that are active, don't have an assigned hardware
* slot assigned to them and are waiting for either a
* disconnection or a command complete to free up a slot.
* assigned_scbs - SCBs that were in the waiting_scbs queue, but were
* assigned a slot by ahc_free_scb.
*
* 2) When a new request comes in, an SCB is allocated from the free_scbs or
* page_scbs queue with preference to SCBs on the free_scbs queue.
*
* 3) If there are no free slots (we retrieved the SCB off of the page_scbs
* queue), the SCB is inserted onto the tail of the waiting_scbs list and
* we attempt to run this queue down.
*
* 4) ahc_run_waiing_queues() looks at both the assigned_scbs and waiting_scbs
* queues. In the case of the assigned_scbs, the commands are immediately
* downloaded and started. For waiting_scbs, we page in all that we can
* ensuring we don't create a resource deadlock (see comments in
* ahc_run_waing_queues()).
*
* 5) After we handle a bunch of command completes, we also try running the
* queues since many SCBs may have disconnected since the last command
* was started and we have at least one free slot on the card.
*
* 6) ahc_free_scb looks at the waiting_scbs queue for a transaction
* requiring a slot and moves it to the assigned_scbs queue if it
* finds one. Otherwise it puts the current SCB onto the free_scbs
* queue for later use.
*
* 7) The driver handles page-in requests from the sequencer in response to
* the NO_MATCH sequencer interrupt. For tagged commands, the approprite
* SCB is easily found since the tag is a direct index into our kernel SCB
* array. For non-tagged commands, we keep a separate array of 16 pointers
* that point to the single possible SCB that was paged out for that target.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <machine/clock.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <i386/scsi/aic7xxx.h>
#include <dev/aic7xxx/aic7xxx_reg.h>
#include <sys/kernel.h>
#define KVTOPHYS(x) vtophys(x)
#define MIN(a,b) ((a < b) ? a : b)
#define ALL_TARGETS -1
u_long ahc_unit = 0;
#ifdef AHC_DEBUG
static int ahc_debug = AHC_SHOWSENSE;
#endif
/**** bit definitions for SCSIDEF ****/
#define HSCSIID 0x07 /* our SCSI ID */
#define HWSCSIID 0x0f /* our SCSI ID if Wide Bus */
static void ahcminphys __P((struct buf *bp));
static int32_t ahc_scsi_cmd __P((struct scsi_xfer *xs));
static struct scsi_adapter ahc_switch =
{
ahc_scsi_cmd,
ahcminphys,
0,
0,
0,
"ahc",
{ 0, 0 }
};
/* the below structure is so we have a default dev struct for our link struct */
static struct scsi_device ahc_dev =
{
NULL, /* Use default error handler */
NULL, /* have a queue, served by this */
NULL, /* have no async handler */
NULL, /* Use default 'done' routine */
"ahc",
0,
{ 0, 0 }
};
/*
* Since the sequencer can disable pausing in a critical section, we
* must loop until it actually stops.
* XXX Should add a timeout in here??
*/
#define PAUSE_SEQUENCER(ahc) \
outb(HCNTRL + ahc->baseport, ahc->pause); \
\
while ((inb(HCNTRL + ahc->baseport) & PAUSE) == 0) \
;
#define UNPAUSE_SEQUENCER(ahc) \
outb( HCNTRL + ahc->baseport, ahc->unpause )
/*
* Restart the sequencer program from address zero
*/
#define RESTART_SEQUENCER(ahc) \
do { \
outb( SEQCTL + ahc->baseport, SEQRESET|FASTMODE ); \
} while (inb(SEQADDR0 + ahc->baseport) != 0 && \
inb(SEQADDR1 + ahc->baseport) != 0); \
\
UNPAUSE_SEQUENCER(ahc);
static u_char ahc_abort_wscb __P((struct ahc_data *ahc, struct scb *scbp,
u_char prev, u_long iobase,
u_char timedout_scb, u_int32_t xs_error));
static void ahc_add_waiting_scb __P((u_long iobase, struct scb *scb));
static void ahc_done __P((struct ahc_data *ahc, struct scb *scbp));
static void ahc_free_scb __P((struct ahc_data *ahc, struct scb *scb,
int flags));
static inline void ahc_send_scb __P((struct ahc_data *ahc, struct scb *scb));
static inline void ahc_fetch_scb __P((struct ahc_data *ahc, struct scb *scb));
static inline void ahc_page_scb __P((struct ahc_data *ahc, struct scb *out_scb,
struct scb *in_scb));
static inline void ahc_run_waiting_queues __P((struct ahc_data *ahc));
static struct scb *
ahc_get_scb __P((struct ahc_data *ahc, int flags));
static void ahc_loadseq __P((u_long iobase));
static int ahc_match_scb __P((struct scb *scb, int target, char channel));
static int ahc_poll __P((struct ahc_data *ahc, int wait));
#ifdef AHC_DEBUG
static void ahc_print_scb __P((struct scb *scb));
#endif
static int ahc_reset_channel __P((struct ahc_data *ahc, char channel,
u_char timedout_scb, u_int32_t xs_error,
u_char initiate_reset));
static int ahc_reset_device __P((struct ahc_data *ahc, int target,
char channel, u_char timedout_scb,
u_int32_t xs_error));
static void ahc_reset_current_bus __P((u_long iobase));
static void ahc_run_done_queue __P((struct ahc_data *ahc));
static void ahc_scsirate __P((struct ahc_data* ahc, u_char *scsirate,
int period, int offset, char channel,
int target));
static timeout_t
ahc_timeout;
static void ahc_busy_target __P((int target, char channel,
u_long iobase));
static void ahc_unbusy_target __P((int target, char channel,
u_long iobase));
#ifdef AHC_DEBUG
static void
ahc_print_scb(scb)
struct scb *scb;
{
printf("scb:%p control:0x%x tcl:0x%x cmdlen:%d cmdpointer:0x%lx\n"
,scb
,scb->control
,scb->tcl
,scb->cmdlen
,scb->cmdpointer );
printf(" datlen:%d data:0x%lx segs:0x%x segp:0x%lx\n"
,scb->datalen
,scb->data
,scb->SG_segment_count
,scb->SG_list_pointer);
printf(" sg_addr:%lx sg_len:%ld\n"
,scb->ahc_dma[0].addr
,scb->ahc_dma[0].len);
}
#endif
static struct {
u_char errno;
char *errmesg;
} hard_error[] = {
{ ILLHADDR, "Illegal Host Access" },
{ ILLSADDR, "Illegal Sequencer Address referrenced" },
{ ILLOPCODE, "Illegal Opcode in sequencer program" },
{ PARERR, "Sequencer Ram Parity Error" }
};
/*
* Valid SCSIRATE values. (p. 3-17)
* Provides a mapping of tranfer periods in ns to the proper value to
* stick in the scsiscfr reg to use that transfer rate.
*/
static struct {
short sxfr;
/* Rates in Ultra mode have bit 8 of sxfr set */
#define ULTRA_SXFR 0x100
short period; /* in ns */
char *rate;
} ahc_syncrates[] = {
{ 0x100, 50, "20.0" },
{ 0x110, 62, "16.0" },
{ 0x120, 75, "13.4" },
{ 0x000, 100, "10.0" },
{ 0x010, 125, "8.0" },
{ 0x020, 150, "6.67" },
{ 0x030, 175, "5.7" },
{ 0x040, 200, "5.0" },
{ 0x050, 225, "4.4" },
{ 0x060, 250, "4.0" },
{ 0x070, 275, "3.6" }
};
static int ahc_num_syncrates =
sizeof(ahc_syncrates) / sizeof(ahc_syncrates[0]);
/*
* Allocate a controller structures for a new device and initialize it.
* ahc_reset should be called before now since we assume that the card
* is paused.
*
*/
struct ahc_data *
ahc_alloc(unit, iobase, type, flags)
int unit;
u_long iobase;
ahc_type type;
ahc_flag flags;
{
/*
* find unit and check we have that many defined
*/
struct ahc_data *ahc;
/*
* Allocate a storage area for us
*/
ahc = malloc(sizeof(struct ahc_data), M_TEMP, M_NOWAIT);
if (!ahc) {
printf("ahc%d: cannot malloc!\n", unit);
return NULL;
}
bzero(ahc, sizeof(struct ahc_data));
STAILQ_INIT(&ahc->free_scbs);
STAILQ_INIT(&ahc->page_scbs);
STAILQ_INIT(&ahc->waiting_scbs);
STAILQ_INIT(&ahc->assigned_scbs);
ahc->unit = unit;
ahc->baseport = iobase;
ahc->type = type;
ahc->flags = flags;
ahc->unpause = (inb(HCNTRL + iobase) & IRQMS) | INTEN;
ahc->pause = ahc->unpause | PAUSE;
return (ahc);
}
void
ahc_free(ahc)
struct ahc_data *ahc;
{
free(ahc, M_DEVBUF);
return;
}
void
ahc_reset(iobase)
u_long iobase;
{
u_char hcntrl;
int wait;
/* Retain the IRQ type accross the chip reset */
hcntrl = (inb(HCNTRL + iobase) & IRQMS) | INTEN;
outb(HCNTRL + iobase, CHIPRST | PAUSE);
/*
* Ensure that the reset has finished
*/
wait = 1000;
while (--wait && !(inb(HCNTRL + iobase) & CHIPRSTACK))
DELAY(1000);
if(wait == 0) {
printf("ahc at 0x%lx: WARNING - Failed chip reset! "
"Trying to initialize anyway.\n", iobase);
}
outb(HCNTRL + iobase, hcntrl | PAUSE);
}
/*
* Look up the valid period to SCSIRATE conversion in our table.
*/
static void
ahc_scsirate(ahc, scsirate, period, offset, channel, target )
struct ahc_data *ahc;
u_char *scsirate;
short period;
u_char offset;
char channel;
int target;
{
int i;
for (i = 0; i < ahc_num_syncrates; i++) {
u_char ultra_enb;
u_char sxfrctl0;
u_long ultra_enb_addr;
if ((ahc_syncrates[i].period - period) >= 0) {
/*
* Watch out for Ultra speeds when ultra is not
* enabled and vice-versa.
*/
if(!(ahc->type & AHC_ULTRA)
&& (ahc_syncrates[i].sxfr & ULTRA_SXFR)) {
/*
* This should only happen if the
* drive is the first to negotiate
* and chooses a high rate. We'll
* just move down the table util
* we hit a non ultra speed.
*/
continue;
}
*scsirate = (ahc_syncrates[i].sxfr) | (offset & 0x0f);
/*
* Ensure Ultra mode is set properly for
* this target.
*/
ultra_enb_addr = ahc->baseport + ULTRA_ENB;
if(channel == 'B' || target > 7)
ultra_enb_addr++;
ultra_enb = inb(ultra_enb_addr);
sxfrctl0 = inb(SXFRCTL0 + ahc->baseport);
if (ahc_syncrates[i].sxfr & ULTRA_SXFR) {
ultra_enb |= 0x01 << (target & 0x07);
sxfrctl0 |= ULTRAEN;
}
else {
ultra_enb &= ~(0x01 << (target & 0x07));
sxfrctl0 &= ~ULTRAEN;
}
outb(ultra_enb_addr, ultra_enb);
outb(SXFRCTL0 + ahc->baseport, sxfrctl0);
if(bootverbose) {
printf("ahc%d: target %d synchronous at %sMHz,"
" offset = 0x%x\n", ahc->unit, target,
ahc_syncrates[i].rate, offset );
}
return;
}
}
/* Default to asyncronous transfers. Also reject this SDTR request. */
*scsirate = 0;
if(bootverbose) {
printf("ahc%d: target %d using asyncronous transfers\n",
ahc->unit, target );
}
}
/*
* Attach all the sub-devices we can find
*/
int
ahc_attach(ahc)
struct ahc_data *ahc;
{
struct scsibus_data *scbus;
/*
* fill in the prototype scsi_links.
*/
ahc->sc_link.adapter_unit = ahc->unit;
ahc->sc_link.adapter_targ = ahc->our_id;
ahc->sc_link.adapter_softc = ahc;
ahc->sc_link.adapter = &ahc_switch;
ahc->sc_link.opennings = 2;
ahc->sc_link.device = &ahc_dev;
ahc->sc_link.flags = DEBUGLEVEL;
ahc->sc_link.fordriver = 0;
if(ahc->type & AHC_TWIN) {
/* Configure the second scsi bus */
ahc->sc_link_b = ahc->sc_link;
ahc->sc_link_b.adapter_targ = ahc->our_id_b;
ahc->sc_link_b.adapter_bus = 1;
ahc->sc_link_b.fordriver = (void *)SELBUSB;
}
/*
* Prepare the scsibus_data area for the upperlevel
* scsi code.
*/
scbus = scsi_alloc_bus();
if(!scbus)
return 0;
scbus->adapter_link = (ahc->flags & AHC_CHANNEL_B_PRIMARY) ?
&ahc->sc_link_b : &ahc->sc_link;
if(ahc->type & AHC_WIDE)
scbus->maxtarg = 15;
/*
* ask the adapter what subunits are present
*/
if(bootverbose)
printf("ahc%d: Probing channel %c\n", ahc->unit,
(ahc->flags & AHC_CHANNEL_B_PRIMARY) ? 'B' : 'A');
scsi_attachdevs(scbus);
scbus = NULL; /* Upper-level SCSI code owns this now */
if(ahc->type & AHC_TWIN) {
scbus = scsi_alloc_bus();
if(!scbus)
return 0;
scbus->adapter_link = (ahc->flags & AHC_CHANNEL_B_PRIMARY) ?
&ahc->sc_link : &ahc->sc_link_b;
if(ahc->type & AHC_WIDE)
scbus->maxtarg = 15;
if(bootverbose)
printf("ahc%d: Probing Channel %c\n", ahc->unit,
(ahc->flags & AHC_CHANNEL_B_PRIMARY) ? 'A': 'B');
scsi_attachdevs(scbus);
scbus = NULL; /* Upper-level SCSI code owns this now */
}
return 1;
}
/*
* Send an SCB down to the card via PIO.
* We assume that the proper SCB is already selected in SCBPTR.
*/
static inline void
ahc_send_scb(ahc, scb)
struct ahc_data *ahc;
struct scb *scb;
{
u_long iobase = ahc->baseport;
outb(SCBCNT + iobase, SCBAUTO);
if( ahc->type == AHC_284 )
/* Can only do 8bit PIO */
outsb(SCBARRAY+iobase, scb, SCB_PIO_TRANSFER_SIZE);
else
outsl(SCBARRAY+iobase, scb,
(SCB_PIO_TRANSFER_SIZE + 3) / 4);
outb(SCBCNT + iobase, 0);
}
/*
* Retrieve an SCB from the card via PIO.
* We assume that the proper SCB is already selected in SCBPTR.
*/
static inline void
ahc_fetch_scb(ahc, scb)
struct ahc_data *ahc;
struct scb *scb;
{
u_long iobase = ahc->baseport;
outb(SCBCNT + iobase, 0x80); /* SCBAUTO */
/* Can only do 8bit PIO for reads */
insb(SCBARRAY+iobase, scb, SCB_PIO_TRANSFER_SIZE);
outb(SCBCNT + iobase, 0);
}
/*
* Swap in_scbp for out_scbp down in the cards SCB array.
* We assume that the SCB for out_scbp is already selected in SCBPTR.
*/
static inline void
ahc_page_scb(ahc, out_scbp, in_scbp)
struct ahc_data *ahc;
struct scb *out_scbp;
struct scb *in_scbp;
{
/* Page-out */
ahc_fetch_scb(ahc, out_scbp);
out_scbp->flags |= SCB_PAGED_OUT;
if(!(out_scbp->control & TAG_ENB))
{
/* Stick in non-tagged array */
int index = (out_scbp->tcl >> 4)
| (out_scbp->tcl & SELBUSB);
ahc->pagedout_ntscbs[index] = out_scbp;
}
/* Page-in */
in_scbp->position = out_scbp->position;
out_scbp->position = SCB_LIST_NULL;
ahc_send_scb(ahc, in_scbp);
in_scbp->flags &= ~SCB_PAGED_OUT;
}
static inline void
ahc_run_waiting_queues(ahc)
struct ahc_data *ahc;
{
struct scb* scb;
u_char cur_scb;
u_long iobase = ahc->baseport;
if(!(ahc->assigned_scbs.stqh_first || ahc->waiting_scbs.stqh_first))
return;
PAUSE_SEQUENCER(ahc);
cur_scb = inb(SCBPTR + iobase);
/*
* First handle SCBs that are waiting but have been
* assigned a slot.
*/
while((scb = ahc->assigned_scbs.stqh_first) != NULL) {
STAILQ_REMOVE_HEAD(&ahc->assigned_scbs, links);
outb(SCBPTR + iobase, scb->position);
ahc_send_scb(ahc, scb);
/* Mark this as an active command */
scb->flags = SCB_ACTIVE;
outb(QINFIFO + iobase, scb->position);
if (!(scb->xs->flags & SCSI_NOMASK)) {
timeout(ahc_timeout, (caddr_t)scb,
(scb->xs->timeout * hz) / 1000);
}
SC_DEBUG(scb->xs->sc_link, SDEV_DB3, ("cmd_sent\n"));
}
/* Now deal with SCBs that require paging */
if((scb = ahc->waiting_scbs.stqh_first) != NULL) {
u_char disc_scb = inb(DISCONNECTED_SCBH + iobase);
u_char active = inb(FLAGS+iobase) & (SELECTED|IDENTIFY_SEEN);
int count = 0;
do {
u_char next_scb;
/* Attempt to page this SCB in */
if(disc_scb == SCB_LIST_NULL)
break;
/*
* Advance disc_scb to the next on in the
* list.
*/
outb(SCBPTR + iobase, disc_scb);
next_scb = inb(SCB_NEXT + iobase);
/*
* We have to be careful about when we allow
* an SCB to be paged out. There must always
* be at least one slot availible for a
* reconnecting target in case it references
* an SCB that has been paged out. Our
* heuristic is that either the disconnected
* list has at least two entries in it or
* there is one entry and the sequencer is
* activily working on an SCB which implies that
* it will either complete or disconnect before
* another reconnection can occur.
*/
if((next_scb != SCB_LIST_NULL) || active)
{
u_char out_scbi;
struct scb* out_scbp;
STAILQ_REMOVE_HEAD(&ahc->waiting_scbs, links);
/*
* Find the in-core SCB for the one
* we're paging out.
*/
out_scbi = inb(SCB_TAG + iobase);
out_scbp = ahc->scbarray[out_scbi];
/* Do the page out */
ahc_page_scb(ahc, out_scbp, scb);
/* Mark this as an active command */
scb->flags = SCB_ACTIVE;
/* Queue the command */
outb(QINFIFO + iobase, scb->position);
if (!(scb->xs->flags & SCSI_NOMASK)) {
timeout(ahc_timeout, (caddr_t)scb,
(scb->xs->timeout * hz) / 1000);
}
SC_DEBUG(scb->xs->sc_link, SDEV_DB3,
("cmd_paged-in\n"));
count++;
/* Advance to the next disconnected SCB */
disc_scb = next_scb;
}
else
break;
} while((scb = ahc->waiting_scbs.stqh_first) != NULL);
if(count) {
/*
* Update the head of the disconnected list.
*/
outb(DISCONNECTED_SCBH + iobase, disc_scb);
if(disc_scb != SCB_LIST_NULL) {
outb(SCBPTR + iobase, disc_scb);
outb(SCB_PREV + iobase, SCB_LIST_NULL);
}
}
}
/* Restore old position */
outb(SCBPTR + iobase, cur_scb);
UNPAUSE_SEQUENCER(ahc);
}
/*
* Add this SCB to the head of the "waiting for selection" list.
*/
static
void ahc_add_waiting_scb (iobase, scb)
u_long iobase;
struct scb *scb;
{
u_char next;
u_char curscb;
curscb = inb(SCBPTR + iobase);
next = inb(WAITING_SCBH + iobase);
outb(SCBPTR+iobase, scb->position);
outb(SCB_NEXT+iobase, next);
outb(WAITING_SCBH + iobase, scb->position);
outb(SCBPTR + iobase, curscb);
}
/*
* Catch an interrupt from the adapter
*/
void
ahc_intr(arg)
void *arg;
{
int intstat;
u_char status;
u_long iobase;
struct scb *scb = NULL;
struct scsi_xfer *xs = NULL;
struct ahc_data *ahc = (struct ahc_data *)arg;
iobase = ahc->baseport;
intstat = inb(INTSTAT + iobase);
/*
* Is this interrupt for me? or for
* someone who is sharing my interrupt
*/
if (!(intstat & INT_PEND))
return;
if (intstat & BRKADRINT) {
/* We upset the sequencer :-( */
/* Lookup the error message */
int i, error = inb(ERROR + iobase);
int num_errors = sizeof(hard_error)/sizeof(hard_error[0]);
for(i = 0; error != 1 && i < num_errors; i++)
error >>= 1;
panic("ahc%d: brkadrint, %s at seqaddr = 0x%x\n",
ahc->unit, hard_error[i].errmesg,
(inb(SEQADDR1 + iobase) << 8) |
inb(SEQADDR0 + iobase));
}
if (intstat & SEQINT) {
/*
* This code isn't used by the SCB page-in code. It
* should probably be moved to cut out the extra
* inb.
*/
u_short targ_mask;
u_char target = (inb(SCSIID + iobase) >> 4) & 0x0f;
u_char scratch_offset = target;
char channel =
inb(SBLKCTL + iobase) & SELBUSB ? 'B': 'A';
if (channel == 'B')
scratch_offset += 8;
targ_mask = (0x01 << scratch_offset);
switch (intstat & SEQINT_MASK) {
case BAD_PHASE:
printf("ahc%d:%c:%d: unknown scsi bus phase. "
"Attempting to continue\n",
ahc->unit, channel, target);
break;
case SEND_REJECT:
{
u_char rejbyte = inb(REJBYTE + iobase);
if(( rejbyte & 0xf0) == 0x20) {
/* Tagged Message */
printf("\nahc%d:%c:%d: Tagged message "
"received without identify. "
"Disabling tagged commands "
"for this target.\n",
ahc->unit, channel, target);
ahc->tagenable &= ~targ_mask;
}
else
printf("ahc%d:%c:%d: Warning - "
"unknown message recieved from "
"target (0x%x - 0x%x). Rejecting\n",
ahc->unit, channel, target,
rejbyte, inb(REJBYTE_EXT + iobase));
break;
}
case NO_IDENT:
panic("ahc%d:%c:%d: Target did not send an IDENTIFY "
"message. SAVED_TCL == 0x%x\n",
ahc->unit, channel, target,
inb(SAVED_TCL + iobase));
break;
case NO_MATCH:
if(ahc->flags & AHC_PAGESCBS) {
/* SCB Page-in request */
u_char tag;
u_char next;
u_char disc_scb;
struct scb *outscb;
u_char arg_1 = inb(ARG_1 + iobase);
if(arg_1 == SCB_LIST_NULL) {
/* Non-tagged command */
int index = target |
(channel == 'B' ? SELBUSB : 0);
scb = ahc->pagedout_ntscbs[index];
}
else
scb = ahc->scbarray[arg_1];
/*
* Now to pick the SCB to page out.
* Either take a free SCB, an assigned SCB,
* an SCB that just completed, the first
* one on the disconnected SCB list, or
* as a last resort a queued SCB.
*/
if(ahc->free_scbs.stqh_first) {
outscb = ahc->free_scbs.stqh_first;
STAILQ_REMOVE_HEAD(&ahc->free_scbs,
links);
scb->position = outscb->position;
outscb->position = SCB_LIST_NULL;
STAILQ_INSERT_HEAD(&ahc->page_scbs,
outscb, links);
outb(SCBPTR + iobase, scb->position);
ahc_send_scb(ahc, scb);
scb->flags &= ~SCB_PAGED_OUT;
goto pagein_done;
}
if(ahc->assigned_scbs.stqh_first) {
outscb = ahc->assigned_scbs.stqh_first;
STAILQ_REMOVE_HEAD(&ahc->assigned_scbs,
links);
scb->position = outscb->position;
outscb->position = SCB_LIST_NULL;
STAILQ_INSERT_HEAD(&ahc->waiting_scbs,
outscb, links);
outscb->flags = SCB_WAITINGQ;
outb(SCBPTR + iobase, scb->position);
ahc_send_scb(ahc, scb);
scb->flags &= ~SCB_PAGED_OUT;
goto pagein_done;
}
if(intstat & CMDCMPLT) {
int scb_index;
outb(CLRINT + iobase, CLRCMDINT);
scb_index = inb(QOUTFIFO + iobase);
if(!(inb(QOUTCNT + iobase) & ahc->qcntmask))
intstat &= ~CMDCMPLT;
outscb = ahc->scbarray[scb_index];
if (!outscb || !(outscb->flags & SCB_ACTIVE)) {
printf("ahc%d: WARNING "
"no command for scb %d (cmdcmplt)\n",
ahc->unit, scb_index );
/* Fall through in hopes of finding another SCB */
}
else {
scb->position = outscb->position;
outscb->position = SCB_LIST_NULL;
outb(SCBPTR + iobase, scb->position);
ahc_send_scb(ahc, scb);
scb->flags &= ~SCB_PAGED_OUT;
untimeout(ahc_timeout, (caddr_t)outscb);
ahc_done(ahc, outscb);
goto pagein_done;
}
}
disc_scb = inb(DISCONNECTED_SCBH + iobase);
if(disc_scb != SCB_LIST_NULL) {
outb(SCBPTR + iobase, disc_scb);
tag = inb(SCB_TAG + iobase);
outscb = ahc->scbarray[tag];
next = inb(SCB_NEXT + iobase);
if(next != SCB_LIST_NULL) {
outb(SCBPTR + iobase, next);
outb(SCB_PREV + iobase,
SCB_LIST_NULL);
outb(SCBPTR + iobase, disc_scb);
}
outb(DISCONNECTED_SCBH + iobase, next);
ahc_page_scb(ahc, outscb, scb);
}
else if(inb(QINCNT + iobase) & ahc->qcntmask) {
/* Pull one of our queued commands as a last resort */
disc_scb = inb(QINFIFO + iobase);
outb(SCBPTR + iobase, disc_scb);
tag = inb(SCB_TAG + iobase);
outscb = ahc->scbarray[tag];
if((outscb->control & 0x23) != TAG_ENB) {
/*
* This is not a simple tagged command
* so its position in the queue
* matters. Take the command at the
* end of the queue instead.
*/
int i;
u_char saved_queue[AHC_SCB_MAX];
u_char queued = inb(QINCNT + iobase) & ahc->qcntmask;
/* Count the command we removed already */
saved_queue[0] = disc_scb;
queued++;
/* Empty the input queue */
for (i = 1; i < queued; i++)
saved_queue[i] = inb(QINFIFO + iobase);
/* Put everyone back put the last entry */
queued--;
for (i = 0; i < queued; i++)
outb (QINFIFO + iobase, saved_queue[i]);
outb(SCBPTR + iobase, saved_queue[queued]);
tag = inb(SCB_TAG + iobase);
outscb = ahc->scbarray[tag];
}
untimeout(ahc_timeout, (caddr_t)outscb);
scb->position = outscb->position;
outscb->position = SCB_LIST_NULL;
STAILQ_INSERT_HEAD(&ahc->waiting_scbs,
outscb, links);
outscb->flags = SCB_WAITINGQ;
ahc_send_scb(ahc, scb);
scb->flags &= ~SCB_PAGED_OUT;
}
else
panic("Page-in request with no candidates");
pagein_done:
outb(RETURN_1 + iobase, SCB_PAGEDIN);
}
else {
printf("ahc%d:%c:%d: no active SCB for "
"reconnecting target - "
"issuing ABORT\n", ahc->unit, channel,
target);
printf("SAVED_TCL == 0x%x\n",
inb(SAVED_TCL + iobase));
ahc_unbusy_target(target, channel, iobase);
outb(SCB_CONTROL + iobase, 0);
outb(CLRSINT1 + iobase, CLRSELTIMEO);
outb(RETURN_1 + iobase, 0);
}
break;
case SDTR_MSG:
{
short period;
u_char offset, rate;
u_char targ_scratch;
u_char maxoffset;
/*
* Help the sequencer to translate the
* negotiated transfer rate. Transfer is
* 1/4 the period in ns as is returned by
* the sync negotiation message. So, we must
* multiply by four
*/
period = inb(ARG_1 + iobase) << 2;
offset = inb(ACCUM + iobase);
targ_scratch = inb(TARG_SCRATCH + iobase
+ scratch_offset);
if(targ_scratch & WIDEXFER)
maxoffset = 0x08;
else
maxoffset = 0x0f;
ahc_scsirate(ahc, &rate, period,
MIN(offset, maxoffset),
channel, target);
/* Preserve the WideXfer flag */
targ_scratch = rate | (targ_scratch & WIDEXFER);
outb(TARG_SCRATCH + iobase + scratch_offset,
targ_scratch);
outb(SCSIRATE + iobase, targ_scratch);
if( (targ_scratch & 0x0f) == 0 )
{
/*
* The requested rate was so low
* that asyncronous transfers are
* faster (not to mention the
* controller won't support them),
* so we issue a message reject to
* ensure we go to asyncronous
* transfers.
*/
outb(RETURN_1 + iobase, SEND_REJ);
}
/* See if we initiated Sync Negotiation */
else if(ahc->sdtrpending & targ_mask)
{
/*
* Don't send an SDTR back to
* the target
*/
outb(RETURN_1 + iobase, 0);
}
else{
/*
* Send our own SDTR in reply
*/
#ifdef AHC_DEBUG
if(ahc_debug & AHC_SHOWMISC)
printf("Sending SDTR!!\n");
#endif
outb(RETURN_1 + iobase, SEND_SDTR);
}
/*
* Negate the flags
*/
ahc->needsdtr &= ~targ_mask;
ahc->sdtrpending &= ~targ_mask;
break;
}
case WDTR_MSG:
{
u_char scratch, bus_width;
bus_width = inb(ARG_1 + iobase);
scratch = inb(TARG_SCRATCH + iobase
+ scratch_offset);
if(ahc->wdtrpending & targ_mask)
{
/*
* Don't send a WDTR back to the
* target, since we asked first.
*/
outb(RETURN_1 + iobase, 0);
switch(bus_width)
{
case BUS_8_BIT:
scratch &= 0x7f;
break;
case BUS_16_BIT:
if(bootverbose)
printf("ahc%d: target "
"%d using 16Bit "
"transfers\n",
ahc->unit,
target);
scratch |= 0x80;
break;
case BUS_32_BIT:
/*
* How can we do 32bit
* transfers on a 16bit
* bus?
*/
outb(RETURN_1 + iobase,
SEND_REJ);
printf("ahc%d: target "
"%d requested 32Bit "
"transfers. "
"Rejecting...\n",
ahc->unit, target);
break;
default:
break;
}
}
else {
/*
* Send our own WDTR in reply
*/
switch(bus_width)
{
case BUS_8_BIT:
scratch &= 0x7f;
break;
case BUS_32_BIT:
case BUS_16_BIT:
if(ahc->type & AHC_WIDE) {
/* Negotiate 16_BITS */
bus_width = BUS_16_BIT;
if(bootverbose)
printf("ahc%d: "
"target %d "
"using 16Bit "
"transfers\n",
ahc->unit,
target);
scratch |= 0x80;
}
else
bus_width = BUS_8_BIT;
break;
default:
break;
}
outb(RETURN_1 + iobase,
bus_width | SEND_WDTR);
}
ahc->needwdtr &= ~targ_mask;
ahc->wdtrpending &= ~targ_mask;
outb(TARG_SCRATCH + iobase + scratch_offset,
scratch);
outb(SCSIRATE + iobase, scratch);
break;
}
case REJECT_MSG:
{
/*
* What we care about here is if we had an
* outstanding SDTR or WDTR message for this
* target. If we did, this is a signal that
* the target is refusing negotiation.
*/
u_char targ_scratch;
targ_scratch = inb(TARG_SCRATCH + iobase
+ scratch_offset);
if(ahc->wdtrpending & targ_mask){
/* note 8bit xfers and clear flag */
targ_scratch &= 0x7f;
ahc->needwdtr &= ~targ_mask;
ahc->wdtrpending &= ~targ_mask;
printf("ahc%d:%c:%d: refuses "
"WIDE negotiation. Using "
"8bit transfers\n",
ahc->unit, channel, target);
}
else if(ahc->sdtrpending & targ_mask){
/* note asynch xfers and clear flag */
targ_scratch &= 0xf0;
ahc->needsdtr &= ~targ_mask;
ahc->sdtrpending &= ~targ_mask;
printf("ahc%d:%c:%d: refuses "
"syncronous negotiation. Using "
"asyncronous transfers\n",
ahc->unit, channel, target);
}
else {
/*
* Otherwise, we ignore it.
*/
#ifdef AHC_DEBUG
if(ahc_debug & AHC_SHOWMISC)
printf("ahc%d:%c:%d: Message
reject -- ignored\n",
ahc->unit, channel,
target);
#endif
break;
}
outb(TARG_SCRATCH + iobase + scratch_offset,
targ_scratch);
outb(SCSIRATE + iobase, targ_scratch);
break;
}
case BAD_STATUS:
{
int scb_index;
/* The sequencer will notify us when a command
* has an error that would be of interest to
* the kernel. This allows us to leave the sequencer
* running in the common case of command completes
* without error.
*/
scb_index = inb(SCB_TAG + iobase);
scb = ahc->scbarray[scb_index];
/*
* Set the default return value to 0 (don't
* send sense). The sense code will change
* this if needed and this reduces code
* duplication.
*/
outb(RETURN_1 + iobase, 0);
if (!(scb && (scb->flags & SCB_ACTIVE))) {
printf("ahc%d:%c:%d: ahc_intr - referenced scb "
"not valid during seqint 0x%x scb(%d)\n",
ahc->unit, channel, target, intstat,
scb_index);
goto clear;
}
xs = scb->xs;
scb->status = inb(SCB_TARGET_STATUS + iobase);
#ifdef AHC_DEBUG
if((ahc_debug & AHC_SHOWSCBS)
&& xs->sc_link->target == DEBUGTARG)
ahc_print_scb(scb);
#endif
xs->status = scb->status;
switch(scb->status){
case SCSI_OK:
printf("ahc%d: Interrupted for staus of"
" 0???\n", ahc->unit);
break;
case SCSI_CHECK:
#ifdef AHC_DEBUG
if(ahc_debug & AHC_SHOWSENSE)
{
sc_print_addr(xs->sc_link);
printf("requests Check Status\n");
}
#endif
if((xs->error == XS_NOERROR) &&
!(scb->flags & SCB_SENSE)) {
struct ahc_dma_seg *sg = scb->ahc_dma;
struct scsi_sense *sc = &(scb->sense_cmd);
#ifdef AHC_DEBUG
if(ahc_debug & AHC_SHOWSENSE)
{
sc_print_addr(xs->sc_link);
printf("Sending Sense\n");
}
#endif
sc->op_code = REQUEST_SENSE;
sc->byte2 = xs->sc_link->lun << 5;
sc->length = sizeof(struct scsi_sense_data);
sc->control = 0;
sg->addr = KVTOPHYS(&xs->sense);
sg->len = sizeof(struct scsi_sense_data);
scb->control &= DISCENB;
scb->status = 0;
scb->SG_segment_count = 1;
scb->SG_list_pointer = KVTOPHYS(sg);
scb->data = sg->addr;
scb->datalen = sg->len;
scb->cmdpointer = KVTOPHYS(sc);
scb->cmdlen = sizeof(*sc);
scb->flags |= SCB_SENSE;
ahc_send_scb(ahc, scb);
/*
* Ensure that the target is "BUSY"
* so we don't get overlapping
* commands if we happen to be doing
* tagged I/O.
*/
ahc_busy_target(target,channel,iobase);
/*
* Make us the next command to run
*/
ahc_add_waiting_scb(iobase, scb);
outb(RETURN_1 + iobase, SEND_SENSE);
break;
}
/*
* Clear the SCB_SENSE Flag and have
* the sequencer do a normal command
* complete with either a "DRIVER_STUFFUP"
* error or whatever other error condition
* we already had.
*/
scb->flags &= ~SCB_SENSE;
if(xs->error == XS_NOERROR)
xs->error = XS_DRIVER_STUFFUP;
break;
case SCSI_BUSY:
xs->error = XS_BUSY;
sc_print_addr(xs->sc_link);
printf("Target Busy\n");
break;
case SCSI_QUEUE_FULL:
/*
* The upper level SCSI code will eventually
* handle this properly.
*/
sc_print_addr(xs->sc_link);
printf("Queue Full\n");
scb->flags = SCB_ASSIGNEDQ;
STAILQ_INSERT_TAIL(&ahc->assigned_scbs,
scb, links);
break;
default:
sc_print_addr(xs->sc_link);
printf("unexpected targ_status: %x\n",
scb->status);
xs->error = XS_DRIVER_STUFFUP;
break;
}
break;
}
case RESIDUAL:
{
int scb_index;
scb_index = inb(SCB_TAG + iobase);
scb = ahc->scbarray[scb_index];
xs = scb->xs;
/*
* Don't clobber valid resid info with
* a resid coming from a check sense
* operation.
*/
if(!(scb->flags & SCB_SENSE)) {
int resid_sgs;
/*
* Remainder of the SG where the transfer
* stopped.
*/
xs->resid =
(inb(iobase+SCB_RESID_DCNT2)<<16) |
(inb(iobase+SCB_RESID_DCNT1)<<8) |
inb(iobase+SCB_RESID_DCNT0);
/*
* Add up the contents of all residual
* SG segments that are after the SG where
* the transfer stopped.
*/
resid_sgs = inb(SCB_RESID_SGCNT + iobase) - 1;
while(resid_sgs > 0) {
int sg;
sg = scb->SG_segment_count - resid_sgs;
xs->resid += scb->ahc_dma[sg].len;
resid_sgs--;
}
xs->flags |= SCSI_RESID_VALID;
#ifdef AHC_DEBUG
if(ahc_debug & AHC_SHOWMISC) {
sc_print_addr(xs->sc_link);
printf("Handled Residual of %ld bytes\n"
,xs->resid);
}
#endif
}
break;
}
case ABORT_TAG:
{
int scb_index;
scb_index = inb(SCB_TAG + iobase);
scb = ahc->scbarray[scb_index];
xs = scb->xs;
/*
* We didn't recieve a valid tag back from
* the target on a reconnect.
*/
sc_print_addr(xs->sc_link);
printf("invalid tag recieved -- sending ABORT_TAG\n");
xs->error = XS_DRIVER_STUFFUP;
untimeout(ahc_timeout, (caddr_t)scb);
ahc_done(ahc, scb);
break;
}
case AWAITING_MSG:
{
int scb_index;
scb_index = inb(SCB_TAG + iobase);
scb = ahc->scbarray[scb_index];
/*
* This SCB had a zero length command, informing
* the sequencer that we wanted to send a special
* message to this target. We only do this for
* BUS_DEVICE_RESET messages currently.
*/
if(scb->flags & SCB_DEVICE_RESET)
{
outb(MSG0 + iobase,
MSG_BUS_DEVICE_RESET);
outb(MSG_LEN + iobase, 1);
printf("Bus Device Reset Message Sent\n");
}
else
panic("ahc_intr: AWAITING_MSG for an SCB that "
"does not have a waiting message");
break;
}
case IMMEDDONE:
{
/*
* Take care of device reset messages
*/
u_char scbindex = inb(SCB_TAG + iobase);
scb = ahc->scbarray[scbindex];
if(scb->flags & SCB_DEVICE_RESET) {
u_char targ_scratch;
int found;
/*
* Go back to async/narrow transfers and
* renegotiate.
*/
ahc_unbusy_target(target, channel, iobase);
ahc->needsdtr |= ahc->needsdtr_orig & targ_mask;
ahc->needwdtr |= ahc->needwdtr_orig & targ_mask;
ahc->sdtrpending &= ~targ_mask;
ahc->wdtrpending &= ~targ_mask;
targ_scratch = inb(TARG_SCRATCH + iobase
+ scratch_offset);
targ_scratch &= SXFR;
outb(TARG_SCRATCH + iobase + scratch_offset,
targ_scratch);
found = ahc_reset_device(ahc, target,
channel, SCB_LIST_NULL,
XS_NOERROR);
sc_print_addr(scb->xs->sc_link);
printf("Bus Device Reset delivered. "
"%d SCBs aborted\n", found);
ahc->in_timeout = FALSE;
ahc_run_done_queue(ahc);
}
else
panic("ahc_intr: Immediate complete for "
"unknown operation.");
break;
}
#if NOT_YET
/* XXX Fill these in later */
case MESG_BUFFER_BUSY:
break;
case MSGIN_PHASEMIS:
break;
#endif
default:
printf("ahc: seqint, "
"intstat == 0x%x, scsisigi = 0x%x\n",
intstat, inb(SCSISIGI + iobase));
break;
}
clear:
/*
* Clear the upper byte that holds SEQINT status
* codes and clear the SEQINT bit.
*/
outb(CLRINT + iobase, CLRSEQINT);
/*
* The sequencer is paused immediately on
* a SEQINT, so we should restart it when
* we leave this section.
*/
UNPAUSE_SEQUENCER(ahc);
}
if (intstat & SCSIINT) {
int scb_index = inb(SCB_TAG + iobase);
status = inb(SSTAT1 + iobase);
scb = ahc->scbarray[scb_index];
if (status & SCSIRSTI) {
char channel;
channel = inb(SBLKCTL + iobase);
channel = channel & SELBUSB ? 'B' : 'A';
printf("ahc%d: Someone reset channel %c\n",
ahc->unit, channel);
ahc_reset_channel(ahc,
channel,
SCB_LIST_NULL,
XS_BUSY,
/* Initiate Reset */FALSE);
scb = NULL;
}
else if (!(scb && (scb->flags & SCB_ACTIVE))){
printf("ahc%d: ahc_intr - referenced scb not "
"valid during scsiint 0x%x scb(%d)\n",
ahc->unit, status, scb_index);
outb(CLRSINT1 + iobase, status);
UNPAUSE_SEQUENCER(ahc);
outb(CLRINT + iobase, CLRSCSIINT);
scb = NULL;
}
else if (status & SCSIPERR) {
/*
* Determine the bus phase and
* queue an appropriate message
*/
char *phase;
u_char mesg_out = MSG_NOP;
u_char lastphase = inb(LASTPHASE + iobase);
xs = scb->xs;
sc_print_addr(xs->sc_link);
switch(lastphase) {
case P_DATAOUT:
phase = "Data-Out";
break;
case P_DATAIN:
phase = "Data-In";
mesg_out = MSG_INITIATOR_DET_ERROR;
break;
case P_COMMAND:
phase = "Command";
break;
case P_MESGOUT:
phase = "Message-Out";
break;
case P_STATUS:
phase = "Status";
mesg_out = MSG_INITIATOR_DET_ERROR;
break;
case P_MESGIN:
phase = "Message-In";
mesg_out = MSG_MSG_PARITY_ERROR;
break;
default:
phase = "unknown";
break;
}
printf("parity error during %s phase.\n", phase);
/*
* We've set the hardware to assert ATN if we
* get a parity error on "in" phases, so all we
* need to do is stuff the message buffer with
* the appropriate message. In phases have set
* mesg_out to something other than MSG_NOP.
*/
if(mesg_out != MSG_NOP) {
outb(MSG0 + iobase, mesg_out);
outb(MSG_LEN + iobase, 1);
}
else
/*
* Should we allow the target to make
* this decision for us?
*/
xs->error = XS_DRIVER_STUFFUP;
}
else if (status & SELTO) {
u_char waiting;
u_char flags;
xs = scb->xs;
xs->error = XS_SELTIMEOUT;
/*
* Clear any pending messages for the timed out
* target, and mark the target as free
*/
flags = inb(FLAGS + iobase);
outb(MSG_LEN + iobase, 0);
ahc_unbusy_target(xs->sc_link->target,
((long)xs->sc_link->fordriver & SELBUSB)
? 'B' : 'A',
iobase);
outb(SCB_CONTROL + iobase, 0);
outb(CLRSINT1 + iobase, CLRSELTIMEO);
outb(CLRINT + iobase, CLRSCSIINT);
/* Shift the waiting for selection queue forward */
waiting = inb(WAITING_SCBH + iobase);
outb(SCBPTR + iobase, waiting);
waiting = inb(SCB_NEXT + iobase);
outb(WAITING_SCBH + iobase, waiting);
RESTART_SEQUENCER(ahc);
}
else if (!(status & BUSFREE)) {
sc_print_addr(xs->sc_link);
printf("Unknown SCSIINT. Status = 0x%x\n", status);
outb(CLRSINT1 + iobase, status);
UNPAUSE_SEQUENCER(ahc);
outb(CLRINT + iobase, CLRSCSIINT);
scb = NULL;
}
if(scb != NULL) {
/* We want to process the command */
untimeout(ahc_timeout, (caddr_t)scb);
ahc_done(ahc, scb);
}
}
if (intstat & CMDCMPLT) {
int scb_index;
do {
scb_index = inb(QOUTFIFO + iobase);
scb = ahc->scbarray[scb_index];
if (!scb || !(scb->flags & SCB_ACTIVE)) {
printf("ahc%d: WARNING "
"no command for scb %d (cmdcmplt)\n"
"QOUTCNT == %d\n",
ahc->unit, scb_index,
inb(QOUTCNT + iobase));
outb(CLRINT + iobase, CLRCMDINT);
continue;
}
outb(CLRINT + iobase, CLRCMDINT);
untimeout(ahc_timeout, (caddr_t)scb);
ahc_done(ahc, scb);
} while (inb(QOUTCNT + iobase) & ahc->qcntmask);
ahc_run_waiting_queues(ahc);
}
}
/*
* We have a scb which has been processed by the
* adaptor, now we look to see how the operation
* went.
*/
static void
ahc_done(ahc, scb)
struct ahc_data *ahc;
struct scb *scb;
{
struct scsi_xfer *xs = scb->xs;
SC_DEBUG(xs->sc_link, SDEV_DB2, ("ahc_done\n"));
/*
* Put the results of the operation
* into the xfer and call whoever started it
*/
if(scb->flags & SCB_SENSE)
xs->error = XS_SENSE;
if(scb->flags & SCB_SENTORDEREDTAG)
ahc->in_timeout = FALSE;
if ((xs->flags & SCSI_ERR_OK) && !(xs->error == XS_SENSE)) {
/* All went correctly OR errors expected */
xs->error = XS_NOERROR;
}
xs->flags |= ITSDONE;
#ifdef AHC_TAGENABLE
if(xs->cmd->opcode == 0x12 && xs->error == XS_NOERROR)
{
struct scsi_inquiry_data *inq_data;
u_short mask = 0x01 << (xs->sc_link->target |
(scb->tcl & 0x08));
/*
* Sneak a look at the results of the SCSI Inquiry
* command and see if we can do Tagged queing. This
* should really be done by the higher level drivers.
*/
inq_data = (struct scsi_inquiry_data *)xs->data;
if((inq_data->flags & SID_CmdQue) && !(ahc->tagenable & mask))
{
printf("ahc%d: target %d Tagged Queuing Device\n",
ahc->unit, xs->sc_link->target);
ahc->tagenable |= mask;
if(ahc->maxhscbs >= 16 || (ahc->flags & AHC_PAGESCBS)) {
/* Default to 8 tags */
xs->sc_link->opennings += 6;
}
else
{
/*
* Default to 4 tags on whimpy
* cards that don't have much SCB
* space and can't page. This prevents
* a single device from hogging all
* slots. We should really have a better
* way of providing fairness.
*/
xs->sc_link->opennings += 2;
}
}
}
#endif
ahc_free_scb(ahc, scb, xs->flags);
scsi_done(xs);
}
/*
* Start the board, ready for normal operation
*/
int
ahc_init(ahc)
struct ahc_data *ahc;
{
u_long iobase = ahc->baseport;
u_char scsi_conf, sblkctl, i;
u_short ultraenable = 0;
int max_targ = 15;
/*
* Assume we have a board at this stage and it has been reset.
*/
/* Handle the SCBPAGING option */
#ifndef AHC_SCBPAGING_ENABLE
ahc->flags &= ~AHC_PAGESCBS;
#endif
/* Determine channel configuration and who we are on the scsi bus. */
switch ( (sblkctl = inb(SBLKCTL + iobase) & 0x0a) ) {
case 0:
ahc->our_id = (inb(SCSICONF + iobase) & HSCSIID);
ahc->flags &= ~AHC_CHANNEL_B_PRIMARY;
if(ahc->type == AHC_394)
printf("Channel %c, SCSI Id=%d, ",
ahc->flags & AHC_CHNLB ? 'B' : 'A',
ahc->our_id);
else
printf("Single Channel, SCSI Id=%d, ", ahc->our_id);
outb(FLAGS + iobase, SINGLE_BUS | (ahc->flags & AHC_PAGESCBS));
break;
case 2:
ahc->our_id = (inb(SCSICONF + 1 + iobase) & HWSCSIID);
ahc->flags &= ~AHC_CHANNEL_B_PRIMARY;
if(ahc->type == AHC_394)
printf("Wide Channel %c, SCSI Id=%d, ",
ahc->flags & AHC_CHNLB ? 'B' : 'A',
ahc->our_id);
else
printf("Wide Channel, SCSI Id=%d, ", ahc->our_id);
ahc->type |= AHC_WIDE;
outb(FLAGS + iobase, WIDE_BUS | (ahc->flags & AHC_PAGESCBS));
break;
case 8:
ahc->our_id = (inb(SCSICONF + iobase) & HSCSIID);
ahc->our_id_b = (inb(SCSICONF + 1 + iobase) & HSCSIID);
printf("Twin Channel, A SCSI Id=%d, B SCSI Id=%d, ",
ahc->our_id, ahc->our_id_b);
ahc->type |= AHC_TWIN;
outb(FLAGS + iobase, TWIN_BUS | (ahc->flags & AHC_PAGESCBS));
break;
default:
printf(" Unsupported adapter type. Ignoring\n");
return(-1);
}
/* Determine the number of SCBs */
{
outb(SCBPTR + iobase, 0);
outb(SCB_CONTROL + iobase, 0);
for(i = 1; i < AHC_SCB_MAX; i++) {
outb(SCBPTR + iobase, i);
outb(SCB_CONTROL + iobase, i);
if(inb(SCB_CONTROL + iobase) != i)
break;
outb(SCBPTR + iobase, 0);
if(inb(SCB_CONTROL + iobase) != 0)
break;
/* Clear the control byte. */
outb(SCBPTR + iobase, i);
outb(SCB_CONTROL + iobase, 0);
ahc->qcntmask |= i; /* Update the count mask. */
}
/* Ensure we clear the 0 SCB's control byte. */
outb(SCBPTR + iobase, 0);
outb(SCB_CONTROL + iobase, 0);
ahc->qcntmask |= i;
ahc->maxhscbs = i;
}
if((ahc->maxhscbs < AHC_SCB_MAX) && (ahc->flags & AHC_PAGESCBS))
ahc->maxscbs = AHC_SCB_MAX;
else {
ahc->maxscbs = ahc->maxhscbs;
ahc->flags &= ~AHC_PAGESCBS;
}
printf("%d SCBs\n", ahc->maxhscbs);
#ifdef AHC_DEBUG
if(ahc_debug & AHC_SHOWMISC) {
struct scb test;
printf("ahc%d: hardware scb %ld bytes; kernel scb; "
"ahc_dma %d bytes\n",
ahc->unit, (u_long)&(test.next) - (u_long)(&test),
sizeof(test),
sizeof(struct ahc_dma_seg));
}
#endif /* AHC_DEBUG */
/* Set the SCSI Id, SXFRCTL0, SXFRCTL1, and SIMODE1, for both channels*/
if(ahc->type & AHC_TWIN)
{
/*
* The device is gated to channel B after a chip reset,
* so set those values first
*/
outb(SCSIID + iobase, ahc->our_id_b);
scsi_conf = inb(SCSICONF + 1 + iobase);
outb(SXFRCTL1 + iobase, (scsi_conf & (ENSPCHK|STIMESEL))
| ENSTIMER|ACTNEGEN|STPWEN);
outb(SIMODE1 + iobase, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
if(ahc->type & AHC_ULTRA)
outb(SXFRCTL0 + iobase, DFON|SPIOEN|ULTRAEN);
else
outb(SXFRCTL0 + iobase, DFON|SPIOEN);
if(scsi_conf & RESET_SCSI) {
/* Reset the bus */
if(bootverbose)
printf("Reseting Channel B\n");
outb(SCSISEQ + iobase, SCSIRSTO);
DELAY(1000);
outb(SCSISEQ + iobase, 0);
/* Ensure we don't get a RSTI interrupt from this */
outb(CLRSINT1 + iobase, CLRSCSIRSTI);
outb(CLRINT + iobase, CLRSCSIINT);
}
/* Select Channel A */
outb(SBLKCTL + iobase, 0);
}
outb(SCSIID + iobase, ahc->our_id);
scsi_conf = inb(SCSICONF + iobase);
outb(SXFRCTL1 + iobase, (scsi_conf & (ENSPCHK|STIMESEL))
| ENSTIMER|ACTNEGEN|STPWEN);
outb(SIMODE1 + iobase, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
if(ahc->type & AHC_ULTRA)
outb(SXFRCTL0 + iobase, DFON|SPIOEN|ULTRAEN);
else
outb(SXFRCTL0 + iobase, DFON|SPIOEN);
if(scsi_conf & RESET_SCSI) {
/* Reset the bus */
if(bootverbose)
printf("Reseting Channel A\n");
outb(SCSISEQ + iobase, SCSIRSTO);
DELAY(1000);
outb(SCSISEQ + iobase, 0);
/* Ensure we don't get a RSTI interrupt from this */
outb(CLRSINT1 + iobase, CLRSCSIRSTI);
outb(CLRINT + iobase, CLRSCSIINT);
}
/*
* Look at the information that board initialization or
* the board bios has left us. In the lower four bits of each
* target's scratch space any value other than 0 indicates
* that we should initiate syncronous transfers. If it's zero,
* the user or the BIOS has decided to disable syncronous
* negotiation to that target so we don't activate the needsdtr
* flag.
*/
ahc->needsdtr_orig = 0;
ahc->needwdtr_orig = 0;
/* Grab the disconnection disable table and invert it for our needs */
if(ahc->flags & AHC_USEDEFAULTS) {
printf("ahc%d: Host Adapter Bios disabled. Using default SCSI "
"device parameters\n", ahc->unit);
ahc->discenable = 0xff;
}
else
ahc->discenable = ~((inb(DISC_DSB + iobase + 1) << 8)
| inb(DISC_DSB + iobase));
if(!(ahc->type & (AHC_WIDE|AHC_TWIN)))
max_targ = 7;
for(i = 0; i <= max_targ; i++){
u_char target_settings;
if (ahc->flags & AHC_USEDEFAULTS) {
target_settings = 0; /* 10MHz */
ahc->needsdtr_orig |= (0x01 << i);
ahc->needwdtr_orig |= (0x01 << i);
}
else {
/* Take the settings leftover in scratch RAM. */
target_settings = inb(TARG_SCRATCH + i + iobase);
if(target_settings & 0x0f){
ahc->needsdtr_orig |= (0x01 << i);
/*Default to a asyncronous transfers(0 offset)*/
target_settings &= 0xf0;
}
if(target_settings & 0x80){
ahc->needwdtr_orig |= (0x01 << i);
/*
* We'll set the Wide flag when we
* are successful with Wide negotiation.
* Turn it off for now so we aren't
* confused.
*/
target_settings &= 0x7f;
}
if(ahc->type & AHC_ULTRA) {
/*
* Enable Ultra for any target that
* has a valid ultra syncrate setting.
*/
u_char rate = target_settings & 0x70;
if(rate == 0x00 || rate == 0x10 ||
rate == 0x20 || rate == 0x40) {
if(rate == 0x40) {
/* Treat 10MHz specially */
target_settings &= ~0x70;
}
else
ultraenable |= (0x01 << i);
}
}
}
outb(TARG_SCRATCH+i+iobase,target_settings);
}
/*
* If we are not a WIDE device, forget WDTR. This
* makes the driver work on some cards that don't
* leave these fields cleared when the BIOS is not
* installed.
*/
if(!(ahc->type & AHC_WIDE))
ahc->needwdtr_orig = 0;
ahc->needsdtr = ahc->needsdtr_orig;
ahc->needwdtr = ahc->needwdtr_orig;
ahc->sdtrpending = 0;
ahc->wdtrpending = 0;
ahc->tagenable = 0;
ahc->orderedtag = 0;
outb(ULTRA_ENB + iobase, ultraenable & 0xff);
outb(ULTRA_ENB + 1 + iobase, (ultraenable >> 8) & 0xff);
#ifdef AHC_DEBUG
/* How did we do? */
if(ahc_debug & AHC_SHOWMISC)
printf("NEEDSDTR == 0x%x\nNEEDWDTR == 0x%x\n"
"DISCENABLE == 0x%x\n", ahc->needsdtr,
ahc->needwdtr, ahc->discenable);
#endif
/*
* Set the number of availible SCBs
*/
outb(SCBCOUNT + iobase, ahc->maxhscbs);
/*
* 2's compliment of maximum tag value
*/
i = ahc->maxscbs;
outb(COMP_SCBCOUNT + iobase, -i & 0xff);
/*
* QCount mask to deal with broken aic7850s that
* sporatically get garbage in the upper bits of
* their QCount registers.
*/
outb(QCNTMASK + iobase, ahc->qcntmask);
/* We don't have any busy targets right now */
outb(ACTIVE_A + iobase, 0);
outb(ACTIVE_B + iobase, 0);
/* We don't have any waiting selections */
outb(WAITING_SCBH + iobase, SCB_LIST_NULL);
/* Our disconnection list is empty too */
outb(DISCONNECTED_SCBH + iobase, SCB_LIST_NULL);
/* Message out buffer starts empty */
outb(MSG_LEN + iobase, 0x00);
/*
* Load the Sequencer program and Enable the adapter
* in "fast" mode.
*/
if(bootverbose)
printf("ahc%d: Downloading Sequencer Program...", ahc->unit);
ahc_loadseq(iobase);
if(bootverbose)
printf("Done\n");
outb(SEQCTL + iobase, FASTMODE);
UNPAUSE_SEQUENCER(ahc);
/*
* Note that we are going and return (to probe)
*/
ahc->flags |= AHC_INIT;
return (0);
}
static void
ahcminphys(bp)
struct buf *bp;
{
/*
* Even though the card can transfer up to 16megs per command
* we are limited by the number of segments in the dma segment
* list that we can hold. The worst case is that all pages are
* discontinuous physically, hense the "page per segment" limit
* enforced here.
*/
if (bp->b_bcount > ((AHC_NSEG - 1) * PAGE_SIZE)) {
bp->b_bcount = ((AHC_NSEG - 1) * PAGE_SIZE);
}
}
/*
* start a scsi operation given the command and
* the data address, target, and lun all of which
* are stored in the scsi_xfer struct
*/
static int32_t
ahc_scsi_cmd(xs)
struct scsi_xfer *xs;
{
struct scb *scb;
struct ahc_dma_seg *sg;
int seg; /* scatter gather seg being worked on */
int thiskv;
physaddr thisphys, nextphys;
int bytes_this_seg, bytes_this_page, datalen, flags;
struct ahc_data *ahc;
u_short mask;
int s;
ahc = (struct ahc_data *)xs->sc_link->adapter_softc;
mask = (0x01 << (xs->sc_link->target
| ((u_long)xs->sc_link->fordriver & 0x08)));
SC_DEBUG(xs->sc_link, SDEV_DB2, ("ahc_scsi_cmd\n"));
/*
* get an scb to use. If the transfer
* is from a buf (possibly from interrupt time)
* then we can't allow it to sleep
*/
flags = xs->flags;
if (flags & ITSDONE) {
printf("ahc%d: Already done?", ahc->unit);
xs->flags &= ~ITSDONE;
}
if (!(flags & INUSE)) {
printf("ahc%d: Not in use?", ahc->unit);
xs->flags |= INUSE;
}
if (!(scb = ahc_get_scb(ahc, flags))) {
xs->error = XS_DRIVER_STUFFUP;
return (TRY_AGAIN_LATER);
}
SC_DEBUG(xs->sc_link, SDEV_DB3, ("start scb(%p)\n", scb));
scb->xs = xs;
if (flags & SCSI_RESET)
scb->flags |= SCB_DEVICE_RESET|SCB_IMMED;
/*
* Put all the arguments for the xfer in the scb
*/
if(ahc->tagenable & mask) {
scb->control |= TAG_ENB;
if(ahc->orderedtag & mask) {
printf("Ordered Tag sent\n");
scb->control |= 0x02;
ahc->orderedtag &= ~mask;
}
}
if(ahc->discenable & mask)
scb->control |= DISCENB;
if((ahc->needwdtr & mask) && !(ahc->wdtrpending & mask))
{
scb->control |= NEEDWDTR;
ahc->wdtrpending |= mask;
}
else if((ahc->needsdtr & mask) && !(ahc->sdtrpending & mask))
{
scb->control |= NEEDSDTR;
ahc->sdtrpending |= mask;
}
scb->tcl = ((xs->sc_link->target << 4) & 0xF0) |
((u_long)xs->sc_link->fordriver & 0x08) |
(xs->sc_link->lun & 0x07);
scb->cmdlen = xs->cmdlen;
scb->cmdpointer = KVTOPHYS(xs->cmd);
xs->resid = 0;
xs->status = 0;
if (xs->datalen) { /* should use S/G only if not zero length */
scb->SG_list_pointer = KVTOPHYS(scb->ahc_dma);
sg = scb->ahc_dma;
seg = 0;
/*
* Set up the scatter gather block
*/
SC_DEBUG(xs->sc_link, SDEV_DB4,
("%ld @%p:- ", xs->datalen, xs->data));
datalen = xs->datalen;
thiskv = (int) xs->data;
thisphys = KVTOPHYS(thiskv);
while ((datalen) && (seg < AHC_NSEG)) {
bytes_this_seg = 0;
/* put in the base address */
sg->addr = thisphys;
SC_DEBUGN(xs->sc_link, SDEV_DB4, ("0x%lx", thisphys));
/* do it at least once */
nextphys = thisphys;
while ((datalen) && (thisphys == nextphys)) {
/*
* This page is contiguous (physically)
* with the the last, just extend the
* length
*/
/* how far to the end of the page */
nextphys = (thisphys & (~(PAGE_SIZE- 1)))
+ PAGE_SIZE;
bytes_this_page = nextphys - thisphys;
/**** or the data ****/
bytes_this_page = min(bytes_this_page ,datalen);
bytes_this_seg += bytes_this_page;
datalen -= bytes_this_page;
/* get more ready for the next page */
thiskv = (thiskv & (~(PAGE_SIZE - 1)))
+ PAGE_SIZE;
if (datalen)
thisphys = KVTOPHYS(thiskv);
}
/*
* next page isn't contiguous, finish the seg
*/
SC_DEBUGN(xs->sc_link, SDEV_DB4,
("(0x%x)", bytes_this_seg));
sg->len = bytes_this_seg;
sg++;
seg++;
}
scb->SG_segment_count = seg;
/* Copy the first SG into the data pointer area */
scb->data = scb->ahc_dma->addr;
scb->datalen = scb->ahc_dma->len;
SC_DEBUGN(xs->sc_link, SDEV_DB4, ("\n"));
if (datalen) {
/* there's still data, must have run out of segs! */
printf("ahc_scsi_cmd%d: more than %d DMA segs\n",
ahc->unit, AHC_NSEG);
xs->error = XS_DRIVER_STUFFUP;
ahc_free_scb(ahc, scb, flags);
return (COMPLETE);
}
}
else {
/*
* No data xfer, use non S/G values
*/
scb->SG_segment_count = 0;
scb->SG_list_pointer = 0;
scb->data = 0;
scb->datalen = 0;
}
#ifdef AHC_DEBUG
if((ahc_debug & AHC_SHOWSCBS) && (xs->sc_link->target == DEBUGTARG))
ahc_print_scb(scb);
#endif
s = splbio();
if( scb->position != SCB_LIST_NULL )
{
/* We already have a valid slot */
u_long iobase = ahc->baseport;
u_char curscb;
PAUSE_SEQUENCER(ahc);
curscb = inb(SCBPTR + iobase);
outb(SCBPTR + iobase, scb->position);
ahc_send_scb(ahc, scb);
outb(SCBPTR + iobase, curscb);
outb(QINFIFO + iobase, scb->position);
UNPAUSE_SEQUENCER(ahc);
scb->flags = SCB_ACTIVE;
if (!(flags & SCSI_NOMASK)) {
timeout(ahc_timeout, (caddr_t)scb,
(xs->timeout * hz) / 1000);
}
SC_DEBUG(xs->sc_link, SDEV_DB3, ("cmd_sent\n"));
}
else {
scb->flags = SCB_WAITINGQ;
STAILQ_INSERT_TAIL(&ahc->waiting_scbs, scb, links);
ahc_run_waiting_queues(ahc);
}
if (!(flags & SCSI_NOMASK)) {
splx(s);
return (SUCCESSFULLY_QUEUED);
}
/*
* If we can't use interrupts, poll for completion
*/
SC_DEBUG(xs->sc_link, SDEV_DB3, ("cmd_poll\n"));
do {
if (ahc_poll(ahc, xs->timeout)) {
if (!(xs->flags & SCSI_SILENT))
printf("cmd fail\n");
ahc_timeout(scb);
break;
}
} while (!(xs->flags & ITSDONE)); /* a non command complete intr */
splx(s);
return (COMPLETE);
}
/*
* A scb (and hence an scb entry on the board is put onto the
* free list.
*/
static void
ahc_free_scb(ahc, scb, flags)
struct ahc_data *ahc;
int flags;
struct scb *scb;
{
struct scb *wscb;
unsigned int opri;
opri = splbio();
scb->flags = SCB_FREE;
if(scb->position == SCB_LIST_NULL) {
STAILQ_INSERT_HEAD(&ahc->page_scbs, scb, links);
if(!scb->links.stqe_next && !ahc->free_scbs.stqh_first)
/*
* If there were no SCBs availible, wake anybody waiting
* for one to come free.
*/
wakeup((caddr_t)&ahc->free_scbs);
}
/*
* If there are any SCBS on the waiting queue,
* assign the slot of this "freed" SCB to the first
* one. We'll run the waiting queues after all command
* completes for a particular interrupt are completed
* or when we start another command.
*/
else if((wscb = ahc->waiting_scbs.stqh_first) != NULL) {
wscb->position = scb->position;
STAILQ_REMOVE_HEAD(&ahc->waiting_scbs, links);
STAILQ_INSERT_HEAD(&ahc->assigned_scbs, wscb, links);
wscb->flags = SCB_ASSIGNEDQ;
/*
* The "freed" SCB will need to be assigned a slot
* before being used, so put it in the page_scbs
* queue.
*/
scb->position = SCB_LIST_NULL;
STAILQ_INSERT_HEAD(&ahc->page_scbs, scb, links);
if(!scb->links.stqe_next && !ahc->free_scbs.stqh_first)
/*
* If there were no SCBs availible, wake anybody waiting
* for one to come free.
*/
wakeup((caddr_t)&ahc->free_scbs);
}
else {
STAILQ_INSERT_HEAD(&ahc->free_scbs, scb, links);
#ifdef AHC_DEBUG
ahc->activescbs--;
#endif
if(!scb->links.stqe_next && !ahc->page_scbs.stqh_first)
/*
* If there were no SCBs availible, wake anybody waiting
* for one to come free.
*/
wakeup((caddr_t)&ahc->free_scbs);
}
splx(opri);
}
/*
* Get a free scb, either one already assigned to a hardware slot
* on the adapter or one that will require an SCB to be paged out before
* use. If there are none, see if we can allocate a new SCB. Otherwise
* either return an error or sleep.
*/
static struct scb *
ahc_get_scb(ahc, flags)
struct ahc_data *ahc;
int flags;
{
unsigned opri;
struct scb *scbp;
opri = splbio();
/*
* If we can and have to, sleep waiting for one to come free
* but only if we can't allocate a new one.
*/
while (1) {
if((scbp = ahc->free_scbs.stqh_first)) {
STAILQ_REMOVE_HEAD(&ahc->free_scbs, links);
}
else if((scbp = ahc->page_scbs.stqh_first)) {
STAILQ_REMOVE_HEAD(&ahc->page_scbs, links);
}
else if (ahc->numscbs < ahc->maxscbs) {
scbp = (struct scb *) malloc(sizeof(struct scb),
M_TEMP, M_NOWAIT);
if (scbp) {
bzero(scbp, sizeof(struct scb));
scbp->tag = ahc->numscbs;
if( ahc->numscbs < ahc->maxhscbs )
scbp->position = ahc->numscbs;
else
scbp->position = SCB_LIST_NULL;
ahc->numscbs++;
/*
* Place in the scbarray
* Never is removed.
*/
ahc->scbarray[scbp->tag] = scbp;
}
else {
printf("ahc%d: Can't malloc SCB\n", ahc->unit);
}
}
else {
if (!(flags & SCSI_NOSLEEP)) {
tsleep((caddr_t)&ahc->free_scbs, PRIBIO,
"ahcscb", 0);
continue;
}
}
break;
}
if (scbp) {
scbp->control = 0;
scbp->status = 0;
scbp->flags = 0;
#ifdef AHC_DEBUG
ahc->activescbs++;
if((ahc_debug & AHC_SHOWSCBCNT)
&& (ahc->activescbs == ahc->maxhscbs))
printf("ahc%d: Max SCBs active\n", ahc->unit);
#endif
}
splx(opri);
return (scbp);
}
static void ahc_loadseq(iobase)
u_long iobase;
{
static unsigned char seqprog[] = {
# include "aic7xxx_seq.h"
};
outb(SEQCTL + iobase, PERRORDIS|SEQRESET|LOADRAM);
outsb(SEQRAM + iobase, seqprog, sizeof(seqprog));
outb(SEQCTL + iobase, FASTMODE|SEQRESET);
do {
outb(SEQCTL + iobase, SEQRESET|FASTMODE);
} while (inb(SEQADDR0 + iobase) != 0 &&
inb(SEQADDR1 + iobase) != 0);
}
/*
* Function to poll for command completion when
* interrupts are disabled (crash dumps)
*/
static int
ahc_poll(ahc, wait)
struct ahc_data *ahc;
int wait; /* in msec */
{
u_long iobase = ahc->baseport;
u_long stport = INTSTAT + iobase;
while (--wait) {
DELAY(1000);
if (inb(stport) & INT_PEND)
break;
} if (wait == 0) {
printf("ahc%d: board is not responding\n", ahc->unit);
return (EIO);
}
ahc_intr((void *)ahc);
return (0);
}
static void
ahc_timeout(arg)
void *arg;
{
struct scb *scb = (struct scb *)arg;
struct ahc_data *ahc;
int s, found;
u_char bus_state;
u_long iobase;
char channel;
s = splbio();
if (!(scb->flags & SCB_ACTIVE)) {
/* Previous timeout took care of me already */
splx(s);
return;
}
ahc = (struct ahc_data *)scb->xs->sc_link->adapter_softc;
if (ahc->in_timeout) {
/*
* Some other SCB has started a recovery operation
* and is still working on cleaning things up.
*/
if (scb->flags & SCB_TIMEDOUT) {
/*
* This SCB has been here before and is not the
* recovery SCB. Cut our losses and panic. Its
* better to do this than trash a filesystem.
*/
panic("ahc%d: Timed-out command times out "
"again\n", ahc->unit);
}
else if (!(scb->flags & SCB_ABORTED))
{
/*
* This is not the SCB that started this timeout
* processing. Give this scb another lifetime so
* that it can continue once we deal with the
* timeout.
*/
scb->flags |= SCB_TIMEDOUT;
timeout(ahc_timeout, (caddr_t)scb,
(scb->xs->timeout * hz) / 1000);
splx(s);
return;
}
}
ahc->in_timeout = TRUE;
/*
* Ensure that the card doesn't do anything
* behind our back.
*/
PAUSE_SEQUENCER(ahc);
sc_print_addr(scb->xs->sc_link);
printf("timed out ");
/*
* Take a snapshot of the bus state and print out
* some information so we can track down driver bugs.
*/
iobase = ahc->baseport;
bus_state = inb(iobase + LASTPHASE);
switch(bus_state & PHASE_MASK)
{
case P_DATAOUT:
printf("in dataout phase");
break;
case P_DATAIN:
printf("in datain phase");
break;
case P_COMMAND:
printf("in command phase");
break;
case P_MESGOUT:
printf("in message out phase");
break;
case P_STATUS:
printf("in status phase");
break;
case P_MESGIN:
printf("in message in phase");
break;
default:
printf("while idle, LASTPHASE == 0x%x",
bus_state);
/*
* We aren't in a valid phase, so assume we're
* idle.
*/
bus_state = 0;
break;
}
printf(", SCSISIGI == 0x%x\n", inb(iobase + SCSISIGI));
/* Decide our course of action */
if(scb->flags & SCB_ABORTED)
{
/*
* Been down this road before.
* Do a full bus reset.
*/
char channel = (scb->tcl & SELBUSB)
? 'B': 'A';
found = ahc_reset_channel(ahc, channel, scb->tag,
XS_TIMEOUT, /*Initiate Reset*/TRUE);
printf("ahc%d: Issued Channel %c Bus Reset #1. "
"%d SCBs aborted\n", ahc->unit, channel, found);
ahc->in_timeout = FALSE;
}
else if(scb->control & TAG_ENB) {
/*
* We could be starving this command
* try sending an ordered tag command
* to the target we come from.
*/
scb->flags |= SCB_ABORTED|SCB_SENTORDEREDTAG;
ahc->orderedtag |= 0xFF;
timeout(ahc_timeout, (caddr_t)scb, (5 * hz));
UNPAUSE_SEQUENCER(ahc);
printf("Ordered Tag queued\n");
goto done;
}
else {
/*
* Send a Bus Device Reset Message:
* The target that is holding up the bus may not
* be the same as the one that triggered this timeout
* (different commands have different timeout lengths).
* It is also impossible to get a message to a target
* if we are in a "frozen" data transfer phase. Our
* strategy here is to queue a bus device reset message
* to the timed out target if it is disconnected.
* Otherwise, if we have an active target we stuff the
* message buffer with a bus device reset message and
* assert ATN in the hopes that the target will let go
* of the bus and finally disconnect. If this fails,
* we'll get another timeout 2 seconds later which will
* cause a bus reset.
*
* XXX If the SCB is paged out, we simply reset the
* bus. We should probably queue a new command
* instead.
*/
/* Test to see if scb is disconnected */
if( !(scb->flags & SCB_PAGED_OUT ) ){
u_char active_scb;
struct scb *active_scbp;
active_scb = inb(SCBPTR + iobase);
active_scbp = ahc->scbarray[inb(SCB_TAG + iobase)];
outb(SCBPTR + iobase, scb->position);
if(inb(SCB_CONTROL + iobase) & DISCONNECTED) {
if(ahc->flags & AHC_PAGESCBS) {
/*
* Pull this SCB out of the
* disconnected list.
*/
u_char prev = inb(SCB_PREV + iobase);
u_char next = inb(SCB_NEXT + iobase);
if(prev == SCB_LIST_NULL) {
/* At the head */
outb(DISCONNECTED_SCBH + iobase,
next );
}
else {
outb(SCBPTR + iobase, prev);
outb(SCB_NEXT + iobase, next);
if(next != SCB_LIST_NULL) {
outb(SCBPTR + iobase,
next);
outb(SCB_PREV + iobase,
prev);
}
outb(SCBPTR + iobase,
scb->position);
}
}
scb->flags |= SCB_DEVICE_RESET|SCB_ABORTED;
scb->control &= DISCENB;
scb->cmdlen = 0;
scb->SG_segment_count = 0;
scb->SG_list_pointer = 0;
scb->data = 0;
scb->datalen = 0;
ahc_send_scb(ahc, scb);
ahc_add_waiting_scb(iobase, scb);
timeout(ahc_timeout, (caddr_t)scb, (2 * hz));
sc_print_addr(scb->xs->sc_link);
printf("BUS DEVICE RESET message queued.\n");
outb(SCBPTR + iobase, active_scb);
UNPAUSE_SEQUENCER(ahc);
goto done;
}
/* Is the active SCB really active? */
else if((active_scbp->flags & SCB_ACTIVE) && bus_state){
outb(MSG_LEN + iobase, 1);
outb(MSG0 + iobase, MSG_BUS_DEVICE_RESET);
outb(SCSISIGO + iobase, bus_state|ATNO);
sc_print_addr(active_scbp->xs->sc_link);
printf("asserted ATN - device reset in "
"message buffer\n");
active_scbp->flags |= SCB_DEVICE_RESET
| SCB_ABORTED;
if(active_scbp != scb) {
untimeout(ahc_timeout,
(caddr_t)active_scbp);
/* Give scb a new lease on life */
timeout(ahc_timeout, (caddr_t)scb,
(scb->xs->timeout * hz) / 1000);
}
timeout(ahc_timeout, (caddr_t)active_scbp,
(2 * hz));
outb(SCBPTR + iobase, active_scb);
UNPAUSE_SEQUENCER(ahc);
goto done;
}
}
/*
* No active target or a paged out SCB.
* Try reseting the bus.
*/
channel = (scb->tcl & SELBUSB) ? 'B': 'A';
found = ahc_reset_channel(ahc, channel, scb->tag,
XS_TIMEOUT,
/*Initiate Reset*/TRUE);
printf("ahc%d: Issued Channel %c Bus Reset #2. "
"%d SCBs aborted\n", ahc->unit, channel,
found);
ahc->in_timeout = FALSE;
}
done:
splx(s);
}
/*
* The device at the given target/channel has been reset. Abort
* all active and queued scbs for that target/channel.
*/
static int
ahc_reset_device(ahc, target, channel, timedout_scb, xs_error)
struct ahc_data *ahc;
int target;
char channel;
u_char timedout_scb;
u_int32_t xs_error;
{
u_long iobase = ahc->baseport;
struct scb *scbp;
u_char active_scb;
int i = 0;
int found = 0;
/* restore this when we're done */
active_scb = inb(SCBPTR + iobase);
/*
* Search the QINFIFO.
*/
{
u_char saved_queue[AHC_SCB_MAX];
u_char queued = inb(QINCNT + iobase) & ahc->qcntmask;
for (i = 0; i < (queued - found); i++) {
saved_queue[i] = inb(QINFIFO + iobase);
outb(SCBPTR + iobase, saved_queue[i]);
scbp = ahc->scbarray[inb(SCB_TAG + iobase)];
if (ahc_match_scb (scbp, target, channel)){
/*
* We found an scb that needs to be aborted.
*/
scbp->flags = SCB_ABORTED|SCB_QUEUED_FOR_DONE;
scbp->xs->error |= xs_error;
if(scbp->position != timedout_scb)
untimeout(ahc_timeout, (caddr_t)scbp);
outb(SCB_CONTROL + iobase, 0);
i--;
found++;
}
}
/* Now put the saved scbs back. */
for (queued = 0; queued < i; queued++) {
outb (QINFIFO + iobase, saved_queue[queued]);
}
}
/*
* Search waiting for selection list.
*/
{
u_char next, prev;
next = inb(WAITING_SCBH + iobase); /* Start at head of list. */
prev = SCB_LIST_NULL;
while (next != SCB_LIST_NULL) {
outb(SCBPTR + iobase, next);
scbp = ahc->scbarray[inb(SCB_TAG + iobase)];
/*
* Select the SCB.
*/
if (ahc_match_scb(scbp, target, channel)) {
next = ahc_abort_wscb(ahc, scbp, prev,
iobase, timedout_scb, xs_error);
found++;
}
else {
prev = next;
next = inb(SCB_NEXT + iobase);
}
}
}
/*
* Go through the entire SCB array now and look for
* commands for this target that are active. These
* are other (most likely tagged) commands that
* were disconnected when the reset occured.
*/
for(i = 0; i < ahc->numscbs; i++) {
scbp = ahc->scbarray[i];
if((scbp->flags & SCB_ACTIVE)
&& ahc_match_scb(scbp, target, channel)) {
/* Ensure the target is "free" */
ahc_unbusy_target(target, channel, iobase);
if( !(scbp->flags & SCB_PAGED_OUT) )
{
outb(SCBPTR + iobase, scbp->position);
outb(SCB_CONTROL + iobase, 0);
}
scbp->flags = SCB_ABORTED|SCB_QUEUED_FOR_DONE;
scbp->xs->error |= xs_error;
if(scbp->tag != timedout_scb)
untimeout(ahc_timeout, (caddr_t)scbp);
found++;
}
}
outb(SCBPTR + iobase, active_scb);
return found;
}
/*
* Manipulate the waiting for selection list and return the
* scb that follows the one that we remove.
*/
static u_char
ahc_abort_wscb (ahc, scbp, prev, iobase, timedout_scb, xs_error)
struct ahc_data *ahc;
struct scb *scbp;
u_char prev;
u_long iobase;
u_char timedout_scb;
u_int32_t xs_error;
{
u_char curscbp, next;
int target = ((scbp->tcl >> 4) & 0x0f);
char channel = (scbp->tcl & SELBUSB) ? 'B' : 'A';
/*
* Select the SCB we want to abort and
* pull the next pointer out of it.
*/
curscbp = inb(SCBPTR + iobase);
outb(SCBPTR + iobase, scbp->position);
next = inb(SCB_NEXT + iobase);
/* Clear the necessary fields */
outb(SCB_CONTROL + iobase, 0);
outb(SCB_NEXT + iobase, SCB_LIST_NULL);
ahc_unbusy_target(target, channel, iobase);
/* update the waiting list */
if( prev == SCB_LIST_NULL )
/* First in the list */
outb(WAITING_SCBH + iobase, next);
else {
/*
* Select the scb that pointed to us
* and update its next pointer.
*/
outb(SCBPTR + iobase, prev);
outb(SCB_NEXT + iobase, next);
}
/*
* Point us back at the original scb position
* and inform the SCSI system that the command
* has been aborted.
*/
outb(SCBPTR + iobase, curscbp);
scbp->flags = SCB_ABORTED|SCB_QUEUED_FOR_DONE;
scbp->xs->error |= xs_error;
if(scbp->tag != timedout_scb)
untimeout(ahc_timeout, (caddr_t)scbp);
return next;
}
static void
ahc_busy_target(target, channel, iobase)
u_char target;
char channel;
u_long iobase;
{
u_char active;
u_long active_port = ACTIVE_A + iobase;
if(target > 0x07 || channel == 'B') {
/*
* targets on the Second channel or
* above id 7 store info in byte two
* of HA_ACTIVE
*/
active_port++;
}
active = inb(active_port);
active |= (0x01 << (target & 0x07));
outb(active_port, active);
}
static void
ahc_unbusy_target(target, channel, iobase)
u_char target;
char channel;
u_long iobase;
{
u_char active;
u_long active_port = ACTIVE_A + iobase;
if(target > 0x07 || channel == 'B') {
/*
* targets on the Second channel or
* above id 7 store info in byte two
* of HA_ACTIVE
*/
active_port++;
}
active = inb(active_port);
active &= ~(0x01 << (target & 0x07));
outb(active_port, active);
}
static void
ahc_reset_current_bus(iobase)
u_long iobase;
{
outb(SCSISEQ + iobase, SCSIRSTO);
DELAY(1000);
outb(SCSISEQ + iobase, 0);
}
static int
ahc_reset_channel(ahc, channel, timedout_scb, xs_error, initiate_reset)
struct ahc_data *ahc;
char channel;
u_char timedout_scb;
u_int32_t xs_error;
u_char initiate_reset;
{
u_long iobase = ahc->baseport;
u_char sblkctl;
char cur_channel;
u_long offset, offset_max;
int found;
/*
* Clean up all the state information for the
* pending transactions on this bus.
*/
found = ahc_reset_device(ahc, ALL_TARGETS, channel,
timedout_scb, xs_error);
if(channel == 'B'){
ahc->needsdtr |= (ahc->needsdtr_orig & 0xff00);
ahc->sdtrpending &= 0x00ff;
outb(ACTIVE_B + iobase, 0);
offset = TARG_SCRATCH + iobase + 8;
offset_max = TARG_SCRATCH + iobase + 16;
}
else if (ahc->type & AHC_WIDE){
ahc->needsdtr = ahc->needsdtr_orig;
ahc->needwdtr = ahc->needwdtr_orig;
ahc->sdtrpending = 0;
ahc->wdtrpending = 0;
outb(ACTIVE_A + iobase, 0);
outb(ACTIVE_B + iobase, 0);
offset = TARG_SCRATCH + iobase;
offset_max = TARG_SCRATCH + iobase + 16;
}
else{
ahc->needsdtr |= (ahc->needsdtr_orig & 0x00ff);
ahc->sdtrpending &= 0xff00;
outb(ACTIVE_A + iobase, 0);
offset = TARG_SCRATCH + iobase;
offset_max = TARG_SCRATCH + iobase + 8;
}
for(;offset < offset_max;offset++) {
/*
* Revert to async/narrow transfers
* until we renegotiate.
*/
u_char targ_scratch;
targ_scratch = inb(offset);
targ_scratch &= SXFR;
outb(offset, targ_scratch);
}
/*
* Reset the bus if we are initiating this reset and
* restart/unpause the sequencer
*/
/* Case 1: Command for another bus is active */
sblkctl = inb(SBLKCTL + iobase);
cur_channel = (sblkctl & SELBUSB) ? 'B' : 'A';
if(cur_channel != channel)
{
/*
* Stealthily reset the other bus
* without upsetting the current bus
*/
outb(SBLKCTL + iobase, sblkctl ^ SELBUSB);
if( initiate_reset )
{
ahc_reset_current_bus(iobase);
}
outb(CLRSINT1 + iobase, CLRSCSIRSTI|CLRSELTIMEO);
outb(CLRINT + iobase, CLRSCSIINT);
outb(SBLKCTL + iobase, sblkctl);
UNPAUSE_SEQUENCER(ahc);
}
/* Case 2: A command from this bus is active or we're idle */
else {
if( initiate_reset )
{
ahc_reset_current_bus(iobase);
}
outb(CLRSINT1 + iobase, CLRSCSIRSTI|CLRSELTIMEO);
outb(CLRINT + iobase, CLRSCSIINT);
RESTART_SEQUENCER(ahc);
}
ahc_run_done_queue(ahc);
return found;
}
void
ahc_run_done_queue(ahc)
struct ahc_data *ahc;
{
int i;
struct scb *scbp;
for(i = 0; i < ahc->numscbs; i++) {
scbp = ahc->scbarray[i];
if(scbp->flags & SCB_QUEUED_FOR_DONE)
ahc_done(ahc, scbp);
}
}
static int
ahc_match_scb (scb, target, channel)
struct scb *scb;
int target;
char channel;
{
int targ = (scb->tcl >> 4) & 0x0f;
char chan = (scb->tcl & SELBUSB) ? 'B' : 'A';
if (target == ALL_TARGETS)
return (chan == channel);
else
return ((chan == channel) && (targ == target));
}
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