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66792b2e44
freebsd-nq/sys/i386/scsi/aic7xxx.c
Justin T. Gibbs 66792b2e44 Disable the selection hardware before acknowledging a SELTO interrupt. 
It seems the 7880 gets confused if you don't do this.
1996-03-11 02:48:41 +00:00

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/*
* Generic driver for the aic7xxx based adaptec SCSI controllers
* Copyright (c) 1994, 1995, 1996 Justin T. Gibbs.
* All rights reserved.
*
* 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
*
* Portions of this driver are based on the FreeBSD 1742 Driver:
*
* Written by Julian Elischer (julian@tfs.com)
* for TRW Financial Systems for use under the MACH(2.5) operating system.
*
* TRW Financial Systems, in accordance with their agreement with Carnegie
* Mellon University, makes this software available to CMU to distribute
* or use in any manner that they see fit as long as this message is kept with
* the software. For this reason TFS also grants any other persons or
* organisations permission to use or modify this software.
*
* TFS supplies this software to be publicly redistributed
* on the understanding that TFS is not responsible for the correct
* functioning of this software in any circumstances.
*
* commenced: Sun Sep 27 18:14:01 PDT 1992
*
* $Id: aic7xxx.c,v 1.56 1996/03/10 07:11:43 gibbs Exp $
*/
/*
* TODO:
* Implement Target Mode
*
*/
#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>
#define PAGESIZ 4096
#define MAX_TAGS 4;
#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;
static int ahc_debug = AHC_SHOWABORTS|AHC_SHOWMISC;
/**** bit definitions for SCSIDEF ****/
#define HSCSIID 0x07 /* our SCSI ID */
#define HWSCSIID 0x0f /* our SCSI ID if Wide Bus */
static u_int32_t ahc_adapter_info __P((int unit));
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,
ahc_adapter_info,
"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_fetch_scb __P((struct ahc_data *ahc, struct scb *scb,
int iosize));
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_active_scb __P((struct ahc_data *ahc));
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, int target));
static inline void ahc_send_scb __P((struct ahc_data *ahc, struct scb *scb));
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->target_channel_lun
,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);
}
static void
ahc_print_active_scb(ahc)
struct ahc_data *ahc;
{
int cur_scb_offset;
u_long iobase = ahc->baseport;
PAUSE_SEQUENCER(ahc);
cur_scb_offset = inb(SCBPTR + iobase);
UNPAUSE_SEQUENCER(ahc);
ahc_print_scb(ahc->scbarray[cur_scb_offset]);
}
#endif
#define PARERR 0x08
#define ILLOPCODE 0x04
#define ILLSADDR 0x02
#define ILLHADDR 0x01
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" },
{ 0x140, 100, "10.0" },
{ 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));
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--) {
DELAY(1000);
if(!(inb(HCNTRL + iobase) & CHIPRST))
break;
}
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, target )
struct ahc_data *ahc;
u_char *scsirate;
short period;
u_char offset;
int target;
{
int i;
for (i = 0; i < ahc_num_syncrates; i++) {
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) {
if (!(ahc_syncrates[i].sxfr & ULTRA_SXFR)) {
printf("ahc%d: target %d requests "
"%sMHz transfers, but adapter "
"in Ultra mode can only sync at "
"10MHz or above\n", ahc->unit,
target, ahc_syncrates[i].rate);
break; /* Use Async */
}
}
else {
if (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);
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_link.
*/
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;
/*
* Prepare the scsibus_data area for the upperlevel
* scsi code.
*/
scbus = scsi_alloc_bus();
if(!scbus)
return 0;
scbus->adapter_link = &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 A\n", ahc->unit);
scsi_attachdevs(scbus);
scbus = NULL; /* Upper-level SCSI code owns this now */
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;
scbus = scsi_alloc_bus();
if(!scbus)
return 0;
scbus->adapter_link = &ahc->sc_link_b;
if(ahc->type & AHC_WIDE)
scbus->maxtarg = 15;
if(bootverbose)
printf("ahc%d: Probing Channel B\n", ahc->unit);
scsi_attachdevs(scbus);
scbus = NULL; /* Upper-level SCSI code owns this now */
}
return 1;
}
/* Send an SCB down to the card via PIO maintaining the SCB pointer */
static inline void
ahc_send_scb(ahc, scb)
struct ahc_data *ahc;
struct scb *scb;
{
u_long iobase = ahc->baseport;
u_char cur_scb;
cur_scb = inb(SCBPTR + iobase);
outb(SCBPTR + iobase, scb->position);
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);
outb(SCBPTR + iobase, cur_scb);
}
static inline void
ahc_fetch_scb(ahc, scb, iosize)
struct ahc_data *ahc;
struct scb *scb;
int iosize;
{
u_long iobase = ahc->baseport;
outb(SCBCNT + iobase, 0x80); /* SCBAUTO */
/* Can only do 8bit PIO for reads */
insb(SCBARRAY+iobase, scb, iosize);
outb(SCBCNT + iobase, 0);
}
/*
* 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_WAITING+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) {
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:
panic("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). Rejecting\n",
ahc->unit, channel, target,
rejbyte);
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:
{
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(SCBARRAY + iobase, 0);
outb(CLRSINT1 + iobase, CLRSELTIMEO);
RESTART_SEQUENCER(ahc);
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),
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:
/* Negotiate 16_BITS */
bus_width = BUS_16_BIT;
case BUS_16_BIT:
if(bootverbose)
printf("ahc%d: target "
"%d using 16Bit "
"transfers\n",
ahc->unit,
target);
scratch |= 0x80;
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(SCBPTR + 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;
ahc_fetch_scb(ahc, scb, SCB_PIO_TRANSFER_SIZE);
#ifdef AHC_DEBUG
if((ahc_debug & AHC_SHOWSCBS)
&& xs->sc_link->target == DEBUGTARG)
ahc_print_scb(scb);
#endif
xs->status = scb->target_status;
switch(scb->target_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)) {
u_char control = scb->control;
u_short active;
struct ahc_dma_seg *sg = scb->ahc_dma;
struct scsi_sense *sc = &(scb->sense_cmd);
u_char tcl = scb->target_channel_lun;
#ifdef AHC_DEBUG
if(ahc_debug & AHC_SHOWSENSE)
{
sc_print_addr(xs->sc_link);
printf("Sending Sense\n");
}
#endif
bzero(scb, SCB_PIO_TRANSFER_SIZE);
scb->control |= control & DISCENB;
scb->flags |= SCB_SENSE;
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->target_channel_lun = tcl;
scb->SG_segment_count = 1;
scb->SG_list_pointer = KVTOPHYS(sg);
scb->cmdpointer = KVTOPHYS(sc);
scb->cmdlen = sizeof(*sc);
scb->data = sg->addr;
scb->datalen = sg->len;
ahc_send_scb(ahc, scb);
outb(SCB_NEXT_WAITING+iobase,
SCB_LIST_NULL);
/*
* 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");
xs->error = XS_BUSY;
break;
default:
sc_print_addr(xs->sc_link);
printf("unexpected targ_status: %x\n",
scb->target_status);
xs->error = XS_DRIVER_STUFFUP;
break;
}
break;
}
case RESIDUAL:
{
int scb_index;
scb_index = inb(SCBPTR + 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.
*/
scb->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;
scb->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"
,scb->xs->resid);
}
#endif
}
break;
}
case ABORT_TAG:
{
int scb_index;
scb_index = inb(SCBPTR + 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");
scb->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(SCBPTR + 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);
}
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(SCBPTR + 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
case PARITY_ERROR:
{
/*
* Determine the bus phase and
* queue an appropriate message
*/
char *phase;
u_char mesg_out = MSG_NOP;
u_char lastphase = inb(LASTPHASE + iobase);
int scb_index = inb(SCBPTR + iobase);
scb = ahc->scbarray[scb_index];
sc_print_addr(scb->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?
*/
scb->xs->error = XS_DRIVER_STUFFUP;
break;
}
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(SCBPTR + iobase);
status = inb(SSTAT1 + iobase);
scb = ahc->scbarray[scb_index];
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;
goto cmdcomplete;
}
xs = scb->xs;
if (status & SCSIRSTI) {
u_char channel;
PAUSE_SEQUENCER(ahc);
channel = inb(SBLKCTL + iobase);
if( !(inb(SCSISEQ + iobase ) & SCSIRSTO)
&& (ahc->flags & AHC_TWIN) )
{
/* Its on the other bus */
channel ^= SELBUSB;
}
ahc_reset_channel(ahc,
channel & SELBUSB ? 'B' : 'A',
SCB_LIST_NULL,
XS_BUSY,
/* Initiate Reset */FALSE);
ahc_run_done_queue(ahc);
}
if (status & SELTO) {
u_char waiting;
u_char flags;
xs->error = XS_TIMEOUT;
/*
* Stop the Selection
*/
outb(SCSISEQ + iobase, 0);
/*
* 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(SCBARRAY + 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_WAITING + 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);
}
}
cmdcomplete:
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));
}
}
/*
* 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 ((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->target_channel_lun & 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;
#ifdef QUEUE_FULL_SUPPORTED
xs->sc_link->opennings += 2;
#endif
}
}
#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;
int max_targ = 15;
/*
* Assume we have a board at this stage and it has been reset.
*/
/* 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);
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);
break;
case 2:
ahc->our_id = (inb(SCSICONF + 1 + iobase) & HWSCSIID);
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);
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);
break;
default:
printf(" Unsupported adapter type. Ignoring\n");
return(-1);
}
printf("%d SCBs\n", ahc->maxscbs);
#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) & (ENSPCHK|STIMESEL);
outb(SXFRCTL1 + iobase, scsi_conf|ENSTIMER|ACTNEGEN|STPWEN);
outb(SIMODE1 + iobase, ENSELTIMO|ENSCSIRST);
if(ahc->type & AHC_ULTRA)
outb(SXFRCTL0 + iobase, DFON|SPIOEN|ULTRAEN);
else
outb(SXFRCTL0 + iobase, DFON|SPIOEN);
/* Reset the bus */
outb(SCSISEQ + iobase, SCSIRSTO);
DELAY(1000);
outb(SCSISEQ + iobase, 0);
/* Select Channel A */
outb(SBLKCTL + iobase, 0);
}
outb(SCSIID + iobase, ahc->our_id);
scsi_conf = inb(SCSICONF + iobase) & (ENSPCHK|STIMESEL);
outb(SXFRCTL1 + iobase, scsi_conf|ENSTIMER|ACTNEGEN|STPWEN);
outb(SIMODE1 + iobase, ENSELTIMO|ENSCSIRST);
if(ahc->type & AHC_ULTRA)
outb(SXFRCTL0 + iobase, DFON|SPIOEN|ULTRAEN);
else
outb(SXFRCTL0 + iobase, DFON|SPIOEN);
/* Reset the bus */
outb(SCSISEQ + iobase, SCSIRSTO);
DELAY(1000);
outb(SCSISEQ + iobase, 0);
/*
* 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;
}
}
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;
#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
/*
* Clear the control byte for every SCB so that the sequencer
* doesn't get confused and think that one of them is valid
*/
for(i = 0; i < ahc->maxscbs; i++) {
outb(SCBPTR + iobase, i);
outb(SCBARRAY + iobase, 0);
}
/*
* Set the number of availible SCBs
*/
outb(SCBCOUNT + iobase, ahc->maxscbs);
/*
* 2s compliment of SCBCOUNT
*/
i = ahc->maxscbs;
outb(COMP_SCBCOUNT + iobase, -i & 0xff);
/* 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 );
outb( WAITING_SCBT + 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) * PAGESIZ)) {
bp->b_bcount = ((AHC_NSEG - 1) * PAGESIZ);
}
}
/*
* 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->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->target_channel_lun = ((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 & (~(PAGESIZ - 1)))
+ PAGESIZ;
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 & (~(PAGESIZ - 1)))
+ PAGESIZ;
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++;
}
} /*end of iov/kv decision */
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
if (!(flags & SCSI_NOMASK)) {
s = splbio();
PAUSE_SEQUENCER(ahc);
ahc_send_scb(ahc, scb);
outb(QINFIFO + ahc->baseport, scb->position);
UNPAUSE_SEQUENCER(ahc);
timeout(ahc_timeout, (caddr_t)scb, (xs->timeout * hz) / 1000);
splx(s);
SC_DEBUG(xs->sc_link, SDEV_DB3, ("cmd_sent\n"));
return (SUCCESSFULLY_QUEUED);
}
/*
* If we can't use interrupts, poll for completion
*/
s = splbio();
PAUSE_SEQUENCER(ahc);
ahc_send_scb(ahc, scb);
outb(QINFIFO + ahc->baseport, scb->position);
UNPAUSE_SEQUENCER(ahc);
SC_DEBUG(xs->sc_link, SDEV_DB3, ("cmd_wait\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);
}
/*
* Return some information to the caller about
* the adapter and it's capabilities.
*/
static u_int32_t
ahc_adapter_info(unit)
int unit;
{
return (2); /* 2 outstanding requests at a time per device */
}
/*
* 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;
{
unsigned int opri;
opri = splbio();
scb->flags = SCB_FREE;
scb->next = ahc->free_scb;
ahc->free_scb = scb;
#ifdef AHC_DEBUG
ahc->activescbs--;
#endif
/*
* If there were none, wake abybody waiting for
* one to come free, starting with queued entries
*/
if (!scb->next) {
wakeup((caddr_t)&ahc->free_scb);
}
splx(opri);
}
/*
* Get a free scb
* If there are none, see if we can allocate a
* new one. 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 (!(scbp = ahc->free_scb)) {
if (ahc->numscbs < ahc->maxscbs) {
scbp = (struct scb *) malloc(sizeof(struct scb),
M_TEMP, M_NOWAIT);
if (scbp) {
bzero(scbp, sizeof(struct scb));
scbp->position = ahc->numscbs;
ahc->numscbs++;
scbp->flags = SCB_ACTIVE;
/*
* Place in the scbarray
* Never is removed. Position
* in ahc->scbarray is the scbarray
* position on the board we will
* load it into.
*/
ahc->scbarray[scbp->position] = scbp;
} else {
printf("ahc%d: Can't malloc SCB\n", ahc->unit);
}
break;
} else {
if (!(flags & SCSI_NOSLEEP)) {
tsleep((caddr_t)&ahc->free_scb, PRIBIO,
"ahcscb", 0);
continue;
}
break;
}
}
if (scbp) {
/* Get SCB from from free list */
ahc->free_scb = scbp->next;
scbp->control = 0;
scbp->flags = SCB_ACTIVE;
#ifdef AHC_DEBUG
ahc->activescbs++;
if((ahc_debug & AHC_SHOWSCBCNT)
&& (ahc->activescbs == ahc->maxscbs))
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 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, h, found;
u_char bus_state;
u_long iobase;
s = splbio();
h = splhigh();
if (!(scb->flags & SCB_ACTIVE)) {
/* Previous timeout took care of me already */
splx(h);
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(h);
splx(s);
return;
}
}
ahc->in_timeout = TRUE;
splx(h);
/*
* 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->target_channel_lun & SELBUSB)
? 'B': 'A';
found = ahc_reset_channel(ahc, channel, scb->position,
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 {
/*
* 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.
*/
u_char active_scb, control;
struct scb *active_scbp;
active_scb = inb(SCBPTR + iobase);
active_scbp = ahc->scbarray[active_scb];
control = inb(SCB_CONTROL + iobase);
/* Test to see if scb is disconnected */
outb(SCBPTR + iobase, scb->position);
if(inb(SCB_CONTROL + iobase) & DISCONNECTED) {
scb->flags |= SCB_DEVICE_RESET|SCB_ABORTED;
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);
}
/* 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);
}
else {
/* No active target? Try reseting the bus */
char channel = (scb->target_channel_lun & SELBUSB)
? 'B': 'A';
found = ahc_reset_channel(ahc, channel, scb->position,
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;
}
}
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.
*/
{
int saved_queue[AHC_SCB_MAX];
int queued = inb(QINCNT + iobase);
for (i = 0; i < (queued - found); i++) {
saved_queue[i] = inb(QINFIFO + iobase);
scbp = ahc->scbarray[saved_queue[i]];
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(SCBPTR + iobase, scbp->position);
outb(SCBARRAY + 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) {
scbp = ahc->scbarray[next];
/*
* Select the SCB.
*/
if (ahc_match_scb(scbp, target, channel)) {
next = ahc_abort_wscb(ahc, scbp, prev,
iobase, timedout_scb, xs_error);
found++;
}
else {
outb(SCBPTR + iobase, scbp->position);
prev = next;
next = inb(SCB_NEXT_WAITING + 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);
outb(SCBPTR + iobase, scbp->position);
outb(SCBARRAY + iobase, 0);
scbp->flags = SCB_ABORTED|SCB_QUEUED_FOR_DONE;
scbp->xs->error |= xs_error;
if(scbp->position != 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->target_channel_lun >> 4) & 0x0f);
char channel = (scbp->target_channel_lun & 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_WAITING + iobase);
/* Clear the necessary fields */
outb(SCB_CONTROL + iobase, 0);
outb(SCB_NEXT_WAITING + 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_WAITING + 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->position != 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);
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);
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->target_channel_lun >> 4) & 0x0f;
char chan = (scb->target_channel_lun & SELBUSB) ? 'B' : 'A';
if (target == ALL_TARGETS)
return (chan == channel);
else
return ((chan == channel) && (targ == target));
}
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