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freebsd-nq/sys/i386/scsi/aic7xxx.c
Justin T. Gibbs 8c64b9a600 Add basic support for the 398X cards as multi-channel SCSI host adapters. 
This involves expanding the support of the SEEPROM routines to deal with
the larger SEEPROMs on these cards and providing a mechanism to share
SCB arrays between multiple controllers.

Most of the 398X support came from Dan Eischer.

ahc_data -> ahc_softc

Clean up some more type bogons I missed from the last pass.

Be more clear when handing the NO_MATCH condition.  NO_MATCH can also
happen when the sequencer encounters an SCB we've asked to be aborted.
1996-10-28 06:10:02 +00:00

3045 lines
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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, aic7880, aic7870, aic7860,
* 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 1.80 1996/10/25 06:42:51 gibbs Exp $
*/
/*
* TODO:
* Implement Target Mode
*
* A few notes on features of the driver.
*
* 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 these transactions down on the host adapter is of
* little use. Instead of leaving this idle SCB down on the card we copy
* it 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...
*
* The sequencer maintains two lists of its hardware SCBs. The first is the
* singly linked free list which tracks all SCBs that are not currently in
* use. The second is the doubly linked disconnected list which holds the
* SCBs of transactions that are in the disconnected state sorted most
* recently disconnected first. When the kernel queues a transaction to
* the card, a hardware SCB to "house" this transaction is retrieved from
* either of these two lists. If the SCB came from the disconnected list,
* a check is made to see if any data transfer or SCB linking (more on linking
* in a bit) information has been changed since it was copied from the host
* and if so, DMAs the SCB back up before it can be used. Once a hardware
* SCB has been obtained, the SCB is DMAed from the host. Before any work
* can begin on this SCB, the sequencer must ensure that either the SCB is
* for a tagged transaction or the target is not already working on another
* non-tagged transaction. If a conflict arises in the non-tagged case, the
* sequencer finds the SCB for the active transactions and sets the SCB_LINKED
* field in that SCB to this next SCB to execute. To facilitate finding
* active non-tagged SCBs, the last four bytes of up to the first four hardware
* SCBs serve as a storage area for the currently active SCB ID for each
* target.
*
* When a device reconnects, a search is made of the hardware SCBs to find
* the SCB for this transaction. If the search fails, a hardware SCB is
* pulled from either the free or disconnected SCB list and the proper
* SCB is DMAed from the host. If the SCB_ABORTED control bit is set
* in the control byte of the SCB while it was disconnected, the sequencer
* will send an abort or abort tag message to the target during the
* reconnection and signal the kernel that the abort was successfull.
*
* When a command completes, a check for non-zero status and residuals is
* made. If either of these conditions exists, the SCB is DMAed back up to
* the host so that it can interpret this information. Additionally, in the
* case of bad status, the sequencer generates a special interrupt and pauses
* itself. This allows the host to setup a request sense command if it
* chooses for this target synchronously with the error so that sense
* information isn't lost.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#if defined(__NetBSD__)
#include <sys/device.h>
#include <machine/bus.h>
#include <machine/intr.h>
#endif /* defined(__NetBSD__) */
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_message.h>
#if defined(__NetBSD__)
#include <scsi/scsi_debug.h>
#endif
#include <scsi/scsiconf.h>
#if defined(__FreeBSD__)
#include <machine/clock.h>
#endif
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#if defined(__FreeBSD__)
#include "opt_aic7xxx.h"
#include <i386/scsi/aic7xxx.h>
#include <dev/aic7xxx/aic7xxx_reg.h>
#endif /* defined(__FreeBSD__) */
#if defined(__NetBSD__)
#include <dev/ic/aic7xxxreg.h>
#include <dev/ic/aic7xxxvar.h>
#define bootverbose 1
#if DEBUGTARGET < 0 /* Negative numbrs for disabling cause warnings */
#define DEBUGTARGET 17
#endif
#endif /* defined(__NetBSD__) */
#include <sys/kernel.h>
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#define ALL_TARGETS -1
#if defined(__FreeBSD__)
u_long ahc_unit = 0;
#endif
#ifdef AHC_DEBUG
static int ahc_debug = AHC_DEBUG;
#endif
#ifdef AHC_BROKEN_CACHE
int ahc_broken_cache = 1;
/*
* "wbinvd" cause writing back whole cache (both CPU internal & external)
* to memory, so that the instruction takes a lot of time.
* This makes machine slow.
*/
#define INVALIDATE_CACHE() __asm __volatile("wbinvd")
#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 void ahc_run_waiting_queue __P((struct ahc_softc *ahc));
static struct scb *
ahc_get_scb __P((struct ahc_softc *ahc, u_int32_t flags));
static void ahc_free_scb __P((struct ahc_softc *ahc, struct scb *scb));
static struct scb *
ahc_alloc_scb __P((struct ahc_softc *ahc));
static inline void pause_sequencer __P((struct ahc_softc *ahc));
static inline void unpause_sequencer __P((struct ahc_softc *ahc,
int unpause_always));
static inline void restart_sequencer __P((struct ahc_softc *ahc));
static struct scsi_adapter ahc_switch =
{
ahc_scsi_cmd,
ahcminphys,
NULL,
NULL,
#if defined(__FreeBSD__)
NULL,
"ahc",
{ 0, 0 }
#endif
};
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 */
#if defined(__FreeBSD__)
"ahc",
0,
{ 0, 0 }
#endif
};
static inline void
pause_sequencer(ahc)
struct ahc_softc *ahc;
{
AHC_OUTB(ahc, HCNTRL, ahc->pause);
/*
* Since the sequencer can disable pausing in a critical section, we
* must loop until it actually stops.
*/
while ((AHC_INB(ahc, HCNTRL) & PAUSE) == 0)
;
}
static inline void
unpause_sequencer(ahc, unpause_always)
struct ahc_softc *ahc;
int unpause_always;
{
if (unpause_always
|| (AHC_INB(ahc, INTSTAT) & (SCSIINT | SEQINT | BRKADRINT)) == 0)
AHC_OUTB(ahc, HCNTRL, ahc->unpause);
}
/*
* Restart the sequencer program from address zero
*/
static inline void
restart_sequencer(ahc)
struct ahc_softc *ahc;
{
do {
AHC_OUTB(ahc, SEQCTL, SEQRESET|FASTMODE);
} while ((AHC_INB(ahc, SEQADDR0) != 0)
|| (AHC_INB(ahc, SEQADDR1) != 0));
unpause_sequencer(ahc, /*unpause_always*/TRUE);
}
#if defined(__FreeBSD__)
#define IS_SCSIBUS_B(ahc, sc_link) \
(((u_int32_t)(sc_link)->fordriver) & SELBUSB)
#else /* NetBSD/OpenBSD */
#define IS_SCSIBUS_B(ahc, sc_link) \
((sc_link)->scsibus == (ahc)->sc_link_b.scsibus)
#endif
static u_int8_t ahc_abort_wscb __P((struct ahc_softc *ahc, struct scb *scbp,
u_int8_t scbpos, u_int8_t prev,
struct scb *timedout_scb,
u_int32_t xs_error));
static void ahc_done __P((struct ahc_softc *ahc, struct scb *scbp));
static void ahc_handle_seqint __P((struct ahc_softc *ahc, u_int8_t intstat));
static void ahc_handle_scsiint __P((struct ahc_softc *ahc,
u_int8_t intstat));
static void ahc_loadseq __P((struct ahc_softc *ahc));
static int ahc_match_scb __P((struct scb *scb, int target, char channel));
static int ahc_poll __P((struct ahc_softc *ahc, int wait));
#ifdef AHC_DEBUG
static void ahc_print_scb __P((struct scb *scb));
#endif
static u_int8_t find_scb __P((struct ahc_softc *ahc, struct scb *scb));
static int ahc_reset_channel __P((struct ahc_softc *ahc, char channel,
struct scb *timedout_scb,
u_int32_t xs_error,
int initiate_reset));
static int ahc_reset_device __P((struct ahc_softc *ahc, int target,
char channel, struct scb *timedout_scb,
u_int32_t xs_error));
static void ahc_reset_current_bus __P((struct ahc_softc *ahc));
static void ahc_run_done_queue __P((struct ahc_softc *ahc));
static void ahc_scsirate __P((struct ahc_softc* ahc, u_int8_t *scsirate,
u_int8_t *period, u_int8_t *offset,
char channel, int target));
#if defined(__FreeBSD__)
static timeout_t
ahc_timeout;
#elif defined(__NetBSD__)
static void ahc_timeout __P((void *));
#endif
static u_int8_t ahc_unbusy_target __P((struct ahc_softc *ahc,
int target, char channel));
static void ahc_construct_sdtr __P((struct ahc_softc *ahc, int start_byte,
u_int8_t period, u_int8_t offset));
static void ahc_construct_wdtr __P((struct ahc_softc *ahc, int start_byte,
u_int8_t bus_width));
static void ahc_calc_residual __P((struct scb *scb));
#if defined(__FreeBSD__)
char *ahc_name(ahc)
struct ahc_softc *ahc;
{
static char name[10];
sprintf(name, "ahc%d", ahc->unit);
return (name);
}
#elif defined(__NetBSD__)
struct cfdriver ahc_cd = {
NULL, "ahc", DV_DULL
};
#endif
#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_int8_t 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 {
int sxfr;
/* Rates in Ultra mode have bit 8 of sxfr set */
#define ULTRA_SXFR 0x100
u_int8_t period; /* Period to send to SCSI target */
char *rate;
} ahc_syncrates[] = {
{ 0x100, 12, "20.0" },
{ 0x110, 15, "16.0" },
{ 0x120, 18, "13.4" },
{ 0x000, 25, "10.0" },
{ 0x010, 31, "8.0" },
{ 0x020, 37, "6.67" },
{ 0x030, 43, "5.7" },
{ 0x040, 50, "5.0" },
{ 0x050, 56, "4.4" },
{ 0x060, 62, "4.0" },
{ 0x070, 68, "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.
*/
#if defined(__FreeBSD__)
struct ahc_softc *
ahc_alloc(unit, iobase, maddr, type, flags, scb_data)
int unit;
u_int32_t iobase;
#elif defined(__NetBSD__)
void
ahc_construct(ahc, bc, ioh, maddr, type, flags)
struct ahc_softc *ahc;
bus_chipset_tag_t bc;
bus_io_handle_t ioh;
#endif
vm_offset_t maddr;
ahc_type type;
ahc_flag flags;
struct scb_data *scb_data;
{
/*
* find unit and check we have that many defined
*/
#if defined(__FreeBSD__)
struct ahc_softc *ahc;
size_t alloc_size;
/*
* Allocate a storage area for us
*/
if (scb_data == NULL)
/*
* We are not sharing SCB space with another controller
* so allocate our own SCB data space.
*/
alloc_size = sizeof(struct full_ahc_softc);
else
alloc_size = sizeof(struct ahc_softc);
ahc = malloc(alloc_size, M_DEVBUF, M_NOWAIT);
if (!ahc) {
printf("ahc%d: cannot malloc!\n", unit);
return NULL;
}
bzero(ahc, alloc_size);
#endif
if (scb_data == NULL) {
struct full_ahc_softc* full_softc = (struct full_ahc_softc*)ahc;
ahc->scb_data = &full_softc->scb_data_storage;
STAILQ_INIT(&ahc->scb_data->free_scbs);
} else
ahc->scb_data = scb_data;
STAILQ_INIT(&ahc->waiting_scbs);
#if defined(__FreeBSD__)
ahc->unit = unit;
#endif
#if defined(__FreeBSD__)
ahc->baseport = iobase;
#elif defined(__NetBSD__)
ahc->sc_bc = bc;
ahc->sc_ioh = ioh;
#endif
ahc->maddr = (volatile u_int8_t *)maddr;
ahc->type = type;
ahc->flags = flags;
ahc->unpause = (AHC_INB(ahc, HCNTRL) & IRQMS) | INTEN;
ahc->pause = ahc->unpause | PAUSE;
#if defined(__FreeBSD__)
return (ahc);
#endif
}
void
ahc_free(ahc)
struct ahc_softc *ahc;
{
#if defined(__FreeBSD__)
free(ahc, M_DEVBUF);
return;
#endif
}
void
#if defined(__FreeBSD__)
ahc_reset(iobase)
u_int32_t iobase;
#elif defined(__NetBSD__)
ahc_reset(devname, bc, ioh)
char *devname;
bus_chipset_tag_t bc;
bus_io_handle_t ioh;
#endif
{
u_int8_t hcntrl;
int wait;
/* Retain the IRQ type accross the chip reset */
#if defined(__FreeBSD__)
hcntrl = (inb(HCNTRL + iobase) & IRQMS) | INTEN;
outb(HCNTRL + iobase, CHIPRST | PAUSE);
#elif defined(__NetBSD__)
hcntrl = (bus_io_read_1(bc, ioh, HCNTRL) & IRQMS) | INTEN;
bus_io_write_1(bc, ioh, HCNTRL, CHIPRST | PAUSE);
#endif
/*
* Ensure that the reset has finished
*/
wait = 1000;
#if defined(__FreeBSD__)
while (--wait && !(inb(HCNTRL + iobase) & CHIPRSTACK))
#elif defined(__NetBSD__)
while (--wait && !(bus_io_read_1(bc, ioh, HCNTRL) & CHIPRSTACK))
#endif
DELAY(1000);
if (wait == 0) {
#if defined(__FreeBSD__)
printf("ahc at 0x%lx: WARNING - Failed chip reset! "
"Trying to initialize anyway.\n", iobase);
#elif defined(__NetBSD__)
printf("%s: WARNING - Failed chip reset! "
"Trying to initialize anyway.\n", devname);
#endif
}
#if defined(__FreeBSD__)
outb(HCNTRL + iobase, hcntrl | PAUSE);
#elif defined(__NetBSD__)
bus_io_write_1(bc, ioh, HCNTRL, hcntrl | PAUSE);
#endif
}
/*
* Look up the valid period to SCSIRATE conversion in our table.
*/
static void
ahc_scsirate(ahc, scsirate, period, offset, channel, target )
struct ahc_softc *ahc;
u_int8_t *scsirate;
u_int8_t *period;
u_int8_t *offset;
char channel;
int target;
{
int i;
u_int32_t ultra_enb_addr;
u_int8_t sxfrctl0;
u_int8_t ultra_enb;
i = ahc_num_syncrates; /* Default to async */
if (*period >= ahc_syncrates[0].period && *offset != 0) {
for (i = 0; i < ahc_num_syncrates; i++) {
if (*period <= ahc_syncrates[i].period) {
/*
* 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 & 0xF0)
| (*offset & 0x0f);
*period = ahc_syncrates[i].period;
if (bootverbose) {
printf("%s: target %d synchronous at "
"%sMHz, offset = 0x%x\n",
ahc_name(ahc), target,
ahc_syncrates[i].rate, *offset );
}
break;
}
}
}
if (i >= ahc_num_syncrates) {
/* Use asyncronous transfers. */
*scsirate = 0;
*period = 0;
*offset = 0;
if (bootverbose)
printf("%s: target %d using asyncronous transfers\n",
ahc_name(ahc), target );
}
/*
* Ensure Ultra mode is set properly for
* this target.
*/
ultra_enb_addr = ULTRA_ENB;
if (channel == 'B' || target > 7)
ultra_enb_addr++;
ultra_enb = AHC_INB(ahc, ultra_enb_addr);
sxfrctl0 = AHC_INB(ahc, SXFRCTL0);
if (*scsirate != 0 && ahc_syncrates[i].sxfr & ULTRA_SXFR) {
ultra_enb |= 0x01 << (target & 0x07);
sxfrctl0 |= ULTRAEN;
} else {
ultra_enb &= ~(0x01 << (target & 0x07));
sxfrctl0 &= ~ULTRAEN;
}
AHC_OUTB(ahc, ultra_enb_addr, ultra_enb);
AHC_OUTB(ahc, SXFRCTL0, sxfrctl0);
}
#if defined(__NetBSD__)
int
ahcprint(aux, name)
void *aux;
char *name;
{
if (name != NULL)
printf("%s: scsibus ", name);
return UNCONF;
}
#endif
/*
* Attach all the sub-devices we can find
*/
int
ahc_attach(ahc)
struct ahc_softc *ahc;
{
struct scsibus_data *scbus;
#ifdef AHC_BROKEN_CACHE
if (cpu_class == CPUCLASS_386) /* doesn't have "wbinvd" instruction */
ahc_broken_cache = 0;
#endif
/*
* fill in the prototype scsi_links.
*/
#if defined(__FreeBSD__)
ahc->sc_link.adapter_unit = ahc->unit;
ahc->sc_link.adapter_targ = ahc->our_id;
ahc->sc_link.fordriver = 0;
#elif defined(__NetBSD__)
ahc->sc_link.adapter_target = ahc->our_id;
#endif
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;
if (ahc->type & AHC_TWIN) {
/* Configure the second scsi bus */
ahc->sc_link_b = ahc->sc_link;
#if defined(__FreeBSD__)
ahc->sc_link_b.adapter_targ = ahc->our_id_b;
ahc->sc_link_b.adapter_bus = 1;
ahc->sc_link_b.fordriver = (void *)SELBUSB;
#elif defined(__NetBSD__)
ahc->sc_link_b.adapter_target = ahc->our_id_b;
#endif
}
#if defined(__FreeBSD__)
/*
* 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 */
}
#elif defined(__NetBSD__)
/*
* XXX - Update MI SCSI code
*
* if(ahc->type & AHC_WIDE)
* max target of both channel A and B = 15;
*/
/*
* ask the adapter what subunits are present
*/
if ((ahc->flags & AHC_CHANNEL_B_PRIMARY) == 0) {
/* make IS_SCSIBUS_B() == false, while probing channel A */
ahc->sc_link_b.scsibus = 0xff;
if (ahc->type & AHC_TWIN)
printf("%s: Probing channel A\n", ahc_name(ahc));
config_found((void *)ahc, &ahc->sc_link, ahcprint);
if (ahc->type & AHC_TWIN) {
printf("%s: Probing channel B\n", ahc_name(ahc));
config_found((void *)ahc, &ahc->sc_link_b, ahcprint);
}
} else {
/*
* if implementation of IS_SCSIBUS_B() is changed to use
* ahc->sc_link.scsibus, then "ahc->sc_link.scsibus = 0xff;"
* is needed, here.
*/
/* assert(ahc->type & AHC_TWIN); */
printf("%s: Probing channel B\n", ahc_name(ahc));
config_found((void *)ahc, &ahc->sc_link_b, ahcprint);
printf("%s: Probing channel A\n", ahc_name(ahc));
config_found((void *)ahc, &ahc->sc_link, ahcprint);
}
#endif
return 1;
}
/*
* Catch an interrupt from the adapter
*/
#if defined(__FreeBSD__)
void
#elif defined (__NetBSD__)
int
#endif
ahc_intr(arg)
void *arg;
{
struct ahc_softc *ahc;
u_int8_t intstat;
ahc = (struct ahc_softc *)arg;
intstat = AHC_INB(ahc, INTSTAT);
/*
* Is this interrupt for me? or for
* someone who is sharing my interrupt
*/
if (!(intstat & INT_PEND))
#if defined(__FreeBSD__)
return;
#elif defined(__NetBSD__)
return 0;
#endif
if (intstat & BRKADRINT) {
/*
* We upset the sequencer :-(
* Lookup the error message
*/
int i, error, num_errors;
error = AHC_INB(ahc, ERROR);
num_errors = sizeof(hard_error)/sizeof(hard_error[0]);
for (i = 0; error != 1 && i < num_errors; i++)
error >>= 1;
panic("%s: brkadrint, %s at seqaddr = 0x%x\n",
ahc_name(ahc), hard_error[i].errmesg,
(AHC_INB(ahc, SEQADDR1) << 8) |
AHC_INB(ahc, SEQADDR0));
}
if (intstat & SEQINT)
ahc_handle_seqint(ahc, intstat);
if (intstat & SCSIINT)
ahc_handle_scsiint(ahc, intstat);
if (intstat & CMDCMPLT) {
struct scb *scb;
u_int8_t scb_index;
u_int8_t qoutcnt;
int int_cleared;
int_cleared = 0;
while (qoutcnt = (AHC_INB(ahc, QOUTCNT) & ahc->qcntmask)) {
for (; qoutcnt > 0; qoutcnt--) {
scb_index = AHC_INB(ahc, QOUTFIFO);
scb = ahc->scb_data->scbarray[scb_index];
if (!scb || !(scb->flags & SCB_ACTIVE)) {
printf("%s: WARNING "
"no command for scb %d "
"(cmdcmplt)\nQOUTCNT == %d\n",
ahc_name(ahc), scb_index,
qoutcnt);
continue;
}
untimeout(ahc_timeout, (caddr_t)scb);
/*
* Save off the residual if there is one.
*/
if (scb->hscb->residual_SG_segment_count != 0)
ahc_calc_residual(scb);
ahc_done(ahc, scb);
}
AHC_OUTB(ahc, CLRINT, CLRCMDINT);
int_cleared++;
}
if (int_cleared == 0)
AHC_OUTB(ahc, CLRINT, CLRCMDINT);
}
if (ahc->waiting_scbs.stqh_first != NULL)
ahc_run_waiting_queue(ahc);
#if defined(__NetBSD__)
return 1;
#endif
}
static void
ahc_handle_seqint(ahc, intstat)
struct ahc_softc *ahc;
u_int8_t intstat;
{
struct scb *scb;
u_int16_t targ_mask;
u_int8_t target = (AHC_INB(ahc, SCSIID) >> 4) & 0x0f;
int scratch_offset = target;
char channel = AHC_INB(ahc, SBLKCTL) & SELBUSB ? 'B': 'A';
if (channel == 'B')
scratch_offset += 8;
targ_mask = (0x01 << scratch_offset);
switch (intstat & SEQINT_MASK) {
case NO_MATCH:
{
/*
* This could be for a normal abort request.
* Figure out the SCB that we were trying to find
* and only give an error if we didn't ask for this
* to happen.
*/
u_int8_t scb_index;
u_int8_t busy_scbid;
busy_scbid = ahc_unbusy_target(ahc, target, channel);
scb_index = AHC_INB(ahc, ARG_1);
if (scb_index == SCB_LIST_NULL)
/* Untagged Request */
scb_index = busy_scbid;
if (scb_index < ahc->scb_data->numscbs) {
scb = ahc->scb_data->scbarray[busy_scbid];
if (scb->hscb->control & ABORT_SCB) {
sc_print_addr(scb->xs->sc_link);
printf(" - SCB abort successfull\n");
break;
}
}
printf("%s:%c:%d: no active SCB for reconnecting "
"target - issuing ABORT\n",
ahc_name(ahc), channel, target);
printf("SAVED_TCL == 0x%x\n",
AHC_INB(ahc, SAVED_TCL));
break;
}
case NO_MATCH_BUSY:
{
/* The SCB that wanted to link in is in CUR_SCBID */
u_int8_t scb_index;
u_int8_t busy_scbindex;
struct scb *busy_scb = NULL;
scb_index = AHC_INB(ahc, CUR_SCBID);
scb = ahc->scb_data->scbarray[scb_index];
/* Find the busy SCB and unbusy this target */
busy_scbindex = ahc_unbusy_target(ahc, scb->xs->sc_link->target,
channel);
if (busy_scbindex == SCB_LIST_NULL)
panic("%s:%c:%d: Target busy link failure, but "
"the target is not busy!\n",
ahc_name(ahc), channel, target);
busy_scb = ahc->scb_data->scbarray[busy_scbindex];
/* Busy SCB should be aborted */
if ((busy_scb != NULL)
&& (busy_scb->hscb->control & ABORT_SCB) == 0
&& (busy_scb->hscb->control & SCB_ACTIVE) != 0) {
panic("%s:%c:%d: Target busy link failure, but "
"busy SCB exists!\n",
ahc_name(ahc), channel, target);
}
if ((scb->hscb->control & ABORT_SCB) == 0) {
/* We didn't want to abort this one too */
AHC_OUTB(ahc, QINFIFO, scb_index);
} else
/* It's been aborted */
ahc_done(ahc, scb);
restart_sequencer(ahc);
}
case SEND_REJECT:
{
u_int8_t rejbyte = AHC_INB(ahc, REJBYTE);
printf("%s:%c:%d: Warning - unknown message recieved from "
"target (0x%x). Rejecting\n",
ahc_name(ahc), channel, target, rejbyte);
break;
}
case NO_IDENT:
panic("%s:%c:%d: Target did not send an IDENTIFY message. "
"SAVED_TCL == 0x%x\n",
ahc_name(ahc), channel, target,
AHC_INB(ahc, SAVED_TCL));
break;
case BAD_PHASE:
printf("%s:%c:%d: unknown scsi bus phase. Attempting to "
"continue\n", ahc_name(ahc), channel, target);
break;
case EXTENDED_MSG:
{
u_int8_t message_length;
u_int8_t message_code;
message_length = AHC_INB(ahc, MSGIN_EXT_LEN);
message_code = AHC_INB(ahc, MSGIN_EXT_OPCODE);
switch (message_code) {
case MSG_EXT_SDTR:
{
u_int8_t period;
u_int8_t offset;
u_int8_t saved_offset;
u_int8_t targ_scratch;
u_int8_t maxoffset;
u_int8_t rate;
if (message_length != MSG_EXT_SDTR_LEN) {
AHC_OUTB(ahc, RETURN_1, SEND_REJ);
ahc->sdtrpending &= ~targ_mask;
break;
}
period = AHC_INB(ahc, MSGIN_EXT_BYTE0);
saved_offset = AHC_INB(ahc, MSGIN_EXT_BYTE1);
targ_scratch = AHC_INB(ahc, TARG_SCRATCH
+ scratch_offset);
if (targ_scratch & WIDEXFER)
maxoffset = MAX_OFFSET_16BIT;
else
maxoffset = MAX_OFFSET_8BIT;
offset = MIN(saved_offset, maxoffset);
ahc_scsirate(ahc, &rate, &period, &offset,
channel, target);
/* Preserve the WideXfer flag */
targ_scratch = rate | (targ_scratch & WIDEXFER);
/*
* Update both the target scratch area and the
* current SCSIRATE.
*/
AHC_OUTB(ahc, TARG_SCRATCH + scratch_offset,
targ_scratch);
AHC_OUTB(ahc, SCSIRATE, targ_scratch);
/*
* See if we initiated Sync Negotiation
* and didn't have to fall down to async
* transfers.
*/
if ((ahc->sdtrpending & targ_mask) != 0
&& (saved_offset == offset)) {
/*
* Don't send an SDTR back to
* the target
*/
AHC_OUTB(ahc, RETURN_1, 0);
ahc->needsdtr &= ~targ_mask;
ahc->sdtrpending &= ~targ_mask;
} else {
/*
* Send our own SDTR in reply
*/
printf("Sending SDTR!!\n");
ahc_construct_sdtr(ahc, /*start_byte*/0,
period, offset);
AHC_OUTB(ahc, RETURN_1, SEND_MSG);
/*
* If we aren't starting a re-negotiation
* because we had to go async in response
* to a "too low" response from the target
* clear the needsdtr flag for this target.
*/
if ((ahc->sdtrpending & targ_mask) == 0)
ahc->needsdtr &= ~targ_mask;
else
ahc->sdtrpending |= targ_mask;
}
break;
}
case MSG_EXT_WDTR:
{
u_int8_t scratch, bus_width;
if (message_length != MSG_EXT_WDTR_LEN) {
AHC_OUTB(ahc, RETURN_1, SEND_REJ);
ahc->wdtrpending &= ~targ_mask;
break;
}
bus_width = AHC_INB(ahc, MSGIN_EXT_BYTE0);
scratch = AHC_INB(ahc, TARG_SCRATCH
+ scratch_offset);
if (ahc->wdtrpending & targ_mask) {
/*
* Don't send a WDTR back to the
* target, since we asked first.
*/
AHC_OUTB(ahc, RETURN_1, 0);
switch (bus_width){
case BUS_8_BIT:
scratch &= 0x7f;
break;
case BUS_16_BIT:
if (bootverbose)
printf("%s: target %d using "
"16Bit transfers\n",
ahc_name(ahc), target);
scratch |= WIDEXFER;
break;
case BUS_32_BIT:
/*
* How can we do 32bit transfers
* on a 16bit bus?
*/
AHC_OUTB(ahc, RETURN_1, SEND_REJ);
printf("%s: target %d requested 32Bit "
"transfers. Rejecting...\n",
ahc_name(ahc), 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("%s: target %d "
"using 16Bit "
"transfers\n",
ahc_name(ahc),
target);
scratch |= WIDEXFER;
} else
bus_width = BUS_8_BIT;
break;
default:
break;
}
ahc_construct_wdtr(ahc, /*start_byte*/0,
bus_width);
AHC_OUTB(ahc, RETURN_1, SEND_MSG);
}
ahc->needwdtr &= ~targ_mask;
ahc->wdtrpending &= ~targ_mask;
AHC_OUTB(ahc, TARG_SCRATCH + scratch_offset, scratch);
AHC_OUTB(ahc, SCSIRATE, scratch);
break;
}
default:
/* Unknown extended message. Reject it. */
AHC_OUTB(ahc, RETURN_1, SEND_REJ);
}
}
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_int8_t targ_scratch;
targ_scratch = AHC_INB(ahc, TARG_SCRATCH
+ 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("%s:%c:%d: refuses WIDE negotiation. Using "
"8bit transfers\n", ahc_name(ahc),
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("%s:%c:%d: refuses syncronous negotiation. "
"Using asyncronous transfers\n",
ahc_name(ahc),
channel, target);
} else {
/*
* Otherwise, we ignore it.
*/
#ifdef AHC_DEBUG
if (ahc_debug & AHC_SHOWMISC)
printf("%s:%c:%d: Message reject -- ignored\n",
ahc_name(ahc), channel, target);
#endif
break;
}
AHC_OUTB(ahc, TARG_SCRATCH + scratch_offset, targ_scratch);
AHC_OUTB(ahc, SCSIRATE, targ_scratch);
break;
}
case BAD_STATUS:
{
u_int8_t scb_index;
struct scsi_xfer *xs;
struct hardware_scb *hscb;
/*
* 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. The sequencer will already have
* dma'd the SCB back up to us, so we can reference
* the in kernel copy directly.
*/
scb_index = AHC_INB(ahc, SCB_TAG);
scb = ahc->scb_data->scbarray[scb_index];
hscb = scb->hscb;
/*
* Set the default return value to 0 (don't
* send sense). The sense code will change
* this if needed and this reduces code
* duplication.
*/
AHC_OUTB(ahc, RETURN_1, 0);
if (!(scb && (scb->flags & SCB_ACTIVE))) {
printf("%s:%c:%d: ahc_intr - referenced scb "
"not valid during seqint 0x%x scb(%d)\n",
ahc_name(ahc),
channel, target, intstat,
scb_index);
goto clear;
}
xs = scb->xs;
xs->status = hscb->status;
switch (hscb->status){
case SCSI_OK:
printf("%s: Interrupted for staus of"
" 0???\n", ahc_name(ahc));
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);
/*
* Save off the residual if there is one.
*/
if (hscb->residual_SG_segment_count != 0)
ahc_calc_residual(scb);
#ifdef AHC_DEBUG
if (ahc_debug & AHC_SHOWSENSE) {
sc_print_addr(xs->sc_link);
printf("Sending Sense\n");
}
#endif
#if defined(__FreeBSD__)
sc->op_code = REQUEST_SENSE;
#elif defined(__NetBSD__)
sc->opcode = REQUEST_SENSE;
#endif
sc->byte2 = xs->sc_link->lun << 5;
sc->length = sizeof(struct scsi_sense_data);
sc->control = 0;
sg->addr = vtophys(&xs->sense);
sg->len = sizeof(struct scsi_sense_data);
hscb->control &= DISCENB;
hscb->status = 0;
hscb->SG_segment_count = 1;
hscb->SG_list_pointer = vtophys(sg);
hscb->data = sg->addr;
hscb->datalen &= 0xFF000000;
hscb->datalen |= sg->len;
hscb->cmdpointer = vtophys(sc);
hscb->cmdlen = sizeof(*sc);
scb->flags |= SCB_SENSE;
AHC_OUTB(ahc, RETURN_1, 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 someday
* handle this properly.
*/
printf("Queue Full\n");
xs->error = XS_BUSY;
break;
default:
sc_print_addr(xs->sc_link);
printf("unexpected targ_status: %x\n", hscb->status);
xs->error = XS_DRIVER_STUFFUP;
break;
}
break;
}
case ABORT_TAG:
{
u_int8_t scb_index;
struct scsi_xfer *xs;
scb_index = AHC_INB(ahc, SCB_TAG);
scb = ahc->scb_data->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 = AHC_INB(ahc, SCB_TAG);
scb = ahc->scb_data->scbarray[scb_index];
/*
* This SCB had MK_MESSAGE set in its control byte,
* informing the sequencer that we wanted to send a
* special message to this target.
*/
if (scb->flags & SCB_DEVICE_RESET) {
AHC_OUTB(ahc, MSG0,
MSG_BUS_DEV_RESET);
AHC_OUTB(ahc, MSG_LEN, 1);
printf("Bus Device Reset Message Sent\n");
} else if (scb->flags & SCB_MSGOUT_WDTR) {
ahc_construct_wdtr(ahc, AHC_INB(ahc, MSG_LEN),
BUS_16_BIT);
} else if (scb->flags & SCB_MSGOUT_SDTR) {
u_int8_t target_scratch;
u_int8_t ultraenable;
int sxfr;
int i;
/* Pull the user defined setting */
target_scratch = AHC_INB(ahc, TARG_SCRATCH
+ scratch_offset);
sxfr = target_scratch & SXFR;
if (scratch_offset < 8)
ultraenable = AHC_INB(ahc, ULTRA_ENB);
else
ultraenable = AHC_INB(ahc, ULTRA_ENB + 1);
if (ultraenable & targ_mask)
/* Want an ultra speed in the table */
sxfr |= 0x100;
for (i = 0; i < ahc_num_syncrates; i++)
if (sxfr == ahc_syncrates[i].sxfr)
break;
ahc_construct_sdtr(ahc, AHC_INB(ahc, MSG_LEN),
ahc_syncrates[i].period,
(target_scratch & WIDEXFER) ?
MAX_OFFSET_16BIT : MAX_OFFSET_8BIT);
} 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_int8_t scbindex = AHC_INB(ahc, SCB_TAG);
scb = ahc->scb_data->scbarray[scbindex];
if (scb->flags & SCB_DEVICE_RESET) {
u_int8_t targ_scratch;
int found;
/*
* Go back to async/narrow transfers and
* renegotiate.
*/
ahc_unbusy_target(ahc, target, channel);
ahc->needsdtr |= ahc->needsdtr_orig & targ_mask;
ahc->needwdtr |= ahc->needwdtr_orig & targ_mask;
ahc->sdtrpending &= ~targ_mask;
ahc->wdtrpending &= ~targ_mask;
targ_scratch = AHC_INB(ahc, TARG_SCRATCH
+ scratch_offset);
targ_scratch &= SXFR;
AHC_OUTB(ahc, TARG_SCRATCH + scratch_offset,
targ_scratch);
found = ahc_reset_device(ahc, target,
channel, 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;
}
case DATA_OVERRUN:
{
/*
* When the sequencer detects an overrun, it
* sets STCNT to 0x00ffffff and allows the
* target to complete its transfer in
* BITBUCKET mode.
*/
u_int8_t scbindex = AHC_INB(ahc, SCB_TAG);
u_int32_t overrun;
scb = ahc->scb_data->scbarray[scbindex];
overrun = AHC_INB(ahc, STCNT0)
| (AHC_INB(ahc, STCNT1) << 8)
| (AHC_INB(ahc, STCNT2) << 16);
overrun = 0x00ffffff - overrun;
sc_print_addr(scb->xs->sc_link);
printf("data overrun of %d bytes detected."
" Forcing a retry.\n", overrun);
/*
* Set this and it will take affect when the
* target does a command complete.
*/
scb->xs->error = XS_DRIVER_STUFFUP;
break;
}
#if NOT_YET
/* XXX Fill these in later */
case MESG_BUFFER_BUSY:
break;
case MSGIN_PHASEMIS:
break;
#endif
default:
printf("ahc_intr: seqint, "
"intstat == 0x%x, scsisigi = 0x%x\n",
intstat, AHC_INB(ahc, SCSISIGI));
break;
}
clear:
/*
* Clear the upper byte that holds SEQINT status
* codes and clear the SEQINT bit.
*/
AHC_OUTB(ahc, CLRINT, CLRSEQINT);
/*
* The sequencer is paused immediately on
* a SEQINT, so we should restart it when
* we're done.
*/
unpause_sequencer(ahc, /*unpause_always*/TRUE);
}
static void
ahc_handle_scsiint(ahc, intstat)
struct ahc_softc *ahc;
u_int8_t intstat;
{
u_int8_t scb_index;
u_int8_t status;
struct scb *scb;
scb_index = AHC_INB(ahc, SCB_TAG);
status = AHC_INB(ahc, SSTAT1);
scb = ahc->scb_data->scbarray[scb_index];
if (status & SCSIRSTI) {
char channel;
channel = (AHC_INB(ahc, SBLKCTL) & SELBUSB) ? 'B' : 'A';
printf("%s: Someone reset channel %c\n",
ahc_name(ahc), channel);
ahc_reset_channel(ahc,
channel,
NULL,
XS_BUSY,
/* Initiate Reset */FALSE);
scb = NULL;
} else if (!(scb && (scb->flags & SCB_ACTIVE))){
printf("%s: ahc_intr - referenced scb not "
"valid during scsiint 0x%x scb(%d)\n",
ahc_name(ahc), status, scb_index);
AHC_OUTB(ahc, CLRSINT1, status);
unpause_sequencer(ahc, /*unpause_always*/TRUE);
AHC_OUTB(ahc, CLRINT, CLRSCSIINT);
scb = NULL;
} else if (status & SCSIPERR) {
/*
* Determine the bus phase and
* queue an appropriate message
*/
char *phase;
u_int8_t mesg_out = MSG_NOOP;
u_int8_t lastphase = AHC_INB(ahc, LASTPHASE);
struct scsi_xfer *xs;
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_ERR;
break;
case P_COMMAND:
phase = "Command";
break;
case P_MESGOUT:
phase = "Message-Out";
break;
case P_STATUS:
phase = "Status";
mesg_out = MSG_INITIATOR_DET_ERR;
break;
case P_MESGIN:
phase = "Message-In";
mesg_out = 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_NOOP) {
AHC_OUTB(ahc, MSG0, mesg_out);
AHC_OUTB(ahc, MSG_LEN, 1);
} else
/*
* Should we allow the target to make
* this decision for us?
*/
xs->error = XS_DRIVER_STUFFUP;
} else if (status & SELTO) {
struct scsi_xfer *xs;
u_int8_t scbptr;
u_int8_t nextscb;
u_int8_t flags;
xs = scb->xs;
xs->error = XS_SELTIMEOUT;
/*
* Clear any pending messages for the timed out
* target, and mark the target as free
*/
flags = AHC_INB(ahc, FLAGS);
AHC_OUTB(ahc, MSG_LEN, 0);
ahc_unbusy_target(ahc, xs->sc_link->target,
IS_SCSIBUS_B(ahc, xs->sc_link) ? 'B' : 'A');
/* Stop the selection */
AHC_OUTB(ahc, SCSISEQ, 0);
AHC_OUTB(ahc, SCB_CONTROL, 0);
AHC_OUTB(ahc, CLRSINT1, CLRSELTIMEO);
AHC_OUTB(ahc, CLRINT, CLRSCSIINT);
/* Shift the waiting Q forward. */
scbptr = AHC_INB(ahc, WAITING_SCBH);
AHC_OUTB(ahc, SCBPTR, scbptr);
nextscb = AHC_INB(ahc, SCB_NEXT);
AHC_OUTB(ahc, WAITING_SCBH, nextscb);
/* Put this SCB back on the free list */
nextscb = AHC_INB(ahc, FREE_SCBH);
AHC_OUTB(ahc, SCB_NEXT, nextscb);
AHC_OUTB(ahc, FREE_SCBH, scbptr);
restart_sequencer(ahc);
} else if (!(status & BUSFREE)) {
sc_print_addr(scb->xs->sc_link);
printf("Unknown SCSIINT. Status = 0x%x\n", status);
AHC_OUTB(ahc, CLRSINT1, status);
unpause_sequencer(ahc, /*unpause_always*/TRUE);
AHC_OUTB(ahc, CLRINT, CLRSCSIINT);
scb = NULL;
}
if (scb != NULL) {
/* We want to process the command */
untimeout(ahc_timeout, (caddr_t)scb);
ahc_done(ahc, scb);
}
}
/*
* 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_softc *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 defined(__NetBSD__)
if (xs->error != XS_NOERROR) {
/* Don't override the error value. */
} else if (scb->flags & SCB_ABORTED) {
xs->error = XS_DRIVER_STUFFUP;
} else
#endif
if (scb->flags & SCB_SENSE)
xs->error = XS_SENSE;
if (scb->flags & SCB_SENTORDEREDTAG)
ahc->in_timeout = FALSE;
#if defined(__FreeBSD__)
if ((xs->flags & SCSI_ERR_OK) && !(xs->error == XS_SENSE)) {
/* All went correctly OR errors expected */
xs->error = XS_NOERROR;
}
#elif defined(__NetBSD__)
/*
* Since NetBSD doesn't have error ignoring operation mode
* (SCSI_ERR_OK in FreeBSD), we don't have to care this case.
*/
#endif
xs->flags |= ITSDONE;
#ifdef AHC_TAGENABLE
/*
* This functionality is provided by the generic SCSI layer
* in FreeBSD 2.2.
*/
if (xs->cmd->opcode == INQUIRY && xs->error == XS_NOERROR) {
struct scsi_inquiry_data *inq_data;
u_int16_t mask = 0x01 << (xs->sc_link->target |
(scb->hscb->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("%s: target %d Tagged Queuing Device\n",
ahc_name(ahc), xs->sc_link->target);
ahc->tagenable |= mask;
if (ahc->scb_data->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_TAGENABLE */
ahc_free_scb(ahc, scb);
scsi_done(xs);
}
/*
* Start the board, ready for normal operation
*/
int
ahc_init(ahc)
struct ahc_softc *ahc;
{
u_int8_t scsi_conf, sblkctl, i;
u_int16_t 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 = AHC_INB(ahc, SBLKCTL) & 0x0a)) {
case 0:
ahc->our_id = (AHC_INB(ahc, SCSICONF) & HSCSIID);
ahc->flags &= ~AHC_CHANNEL_B_PRIMARY;
if ((ahc->type & AHC_39X) != 0) {
char channel = 'A';
if ((ahc->flags & (AHC_CHNLB|AHC_CHNLC)) != 0)
channel = ahc->flags & AHC_CHNLB ? 'B' : 'C';
printf("Channel %c, SCSI Id=%d, ", channel,
ahc->our_id);
} else
printf("Single Channel, SCSI Id=%d, ", ahc->our_id);
AHC_OUTB(ahc, FLAGS, SINGLE_BUS | (ahc->flags & AHC_PAGESCBS));
break;
case 2:
ahc->our_id = (AHC_INB(ahc, SCSICONF + 1) & HWSCSIID);
ahc->flags &= ~AHC_CHANNEL_B_PRIMARY;
if ((ahc->type & AHC_39X) != 0) {
char channel = 'A';
if ((ahc->flags & (AHC_CHNLB|AHC_CHNLC)) != 0)
channel = ahc->flags & AHC_CHNLB ? 'B' : 'C';
printf("Wide Channel %c, SCSI Id=%d, ", channel,
ahc->our_id);
} else
printf("Wide Channel, SCSI Id=%d, ", ahc->our_id);
ahc->type |= AHC_WIDE;
AHC_OUTB(ahc, FLAGS, WIDE_BUS | (ahc->flags & AHC_PAGESCBS));
break;
case 8:
ahc->our_id = (AHC_INB(ahc, SCSICONF) & HSCSIID);
ahc->our_id_b = (AHC_INB(ahc, SCSICONF + 1) & HSCSIID);
printf("Twin Channel, A SCSI Id=%d, B SCSI Id=%d, ",
ahc->our_id, ahc->our_id_b);
ahc->type |= AHC_TWIN;
AHC_OUTB(ahc, FLAGS, TWIN_BUS | (ahc->flags & AHC_PAGESCBS));
break;
default:
printf(" Unsupported adapter type. Ignoring\n");
return(-1);
}
/* Determine the number of SCBs and initialize them */
if (ahc->scb_data->maxhscbs == 0) {
/* SCB 0 heads the free list */
AHC_OUTB(ahc, FREE_SCBH, 0);
for (i = 0; i < AHC_SCB_MAX; i++) {
AHC_OUTB(ahc, SCBPTR, i);
AHC_OUTB(ahc, SCB_CONTROL, i);
if(AHC_INB(ahc, SCB_CONTROL) != i)
break;
AHC_OUTB(ahc, SCBPTR, 0);
if(AHC_INB(ahc, SCB_CONTROL) != 0)
break;
AHC_OUTB(ahc, SCBPTR, i);
/* Clear the control byte. */
AHC_OUTB(ahc, SCB_CONTROL, 0);
/* Set the next pointer */
AHC_OUTB(ahc, SCB_NEXT, i+1);
/* No Busy non-tagged targets yet */
AHC_OUTB(ahc, SCB_ACTIVE0, SCB_LIST_NULL);
AHC_OUTB(ahc, SCB_ACTIVE1, SCB_LIST_NULL);
AHC_OUTB(ahc, SCB_ACTIVE2, SCB_LIST_NULL);
AHC_OUTB(ahc, SCB_ACTIVE3, SCB_LIST_NULL);
}
/* Make that the last SCB terminates the free list */
AHC_OUTB(ahc, SCBPTR, i-1);
AHC_OUTB(ahc, SCB_NEXT, SCB_LIST_NULL);
/* Ensure we clear the 0 SCB's control byte. */
AHC_OUTB(ahc, SCBPTR, 0);
AHC_OUTB(ahc, SCB_CONTROL, 0);
ahc->scb_data->maxhscbs = i;
}
if ((ahc->scb_data->maxhscbs < AHC_SCB_MAX)
&& (ahc->flags & AHC_PAGESCBS)) {
ahc->scb_data->maxscbs = AHC_SCB_MAX;
printf("%d/%d SCBs\n", ahc->scb_data->maxhscbs,
ahc->scb_data->maxscbs);
} else {
ahc->scb_data->maxscbs = ahc->scb_data->maxhscbs;
ahc->flags &= ~AHC_PAGESCBS;
printf("%d SCBs\n", ahc->scb_data->maxhscbs);
}
#ifdef AHC_DEBUG
if (ahc_debug & AHC_SHOWMISC) {
printf("%s: hardware scb %d bytes; kernel scb %d bytes; "
"ahc_dma %d bytes\n",
ahc_name(ahc),
sizeof(struct hardware_scb),
sizeof(struct scb),
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
*/
AHC_OUTB(ahc, SCSIID, ahc->our_id_b);
scsi_conf = AHC_INB(ahc, SCSICONF + 1);
AHC_OUTB(ahc, SXFRCTL1, (scsi_conf & (ENSPCHK|STIMESEL))
| ENSTIMER|ACTNEGEN|STPWEN);
AHC_OUTB(ahc, SIMODE1, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
if (ahc->type & AHC_ULTRA)
AHC_OUTB(ahc, SXFRCTL0, DFON|SPIOEN|ULTRAEN);
else
AHC_OUTB(ahc, SXFRCTL0, DFON|SPIOEN);
if (scsi_conf & RESET_SCSI) {
/* Reset the bus */
if (bootverbose)
printf("%s: Reseting Channel B\n",
ahc_name(ahc));
AHC_OUTB(ahc, SCSISEQ, SCSIRSTO);
DELAY(1000);
AHC_OUTB(ahc, SCSISEQ, 0);
/* Ensure we don't get a RSTI interrupt from this */
AHC_OUTB(ahc, CLRSINT1, CLRSCSIRSTI);
AHC_OUTB(ahc, CLRINT, CLRSCSIINT);
}
/* Select Channel A */
AHC_OUTB(ahc, SBLKCTL, 0);
}
AHC_OUTB(ahc, SCSIID, ahc->our_id);
scsi_conf = AHC_INB(ahc, SCSICONF);
AHC_OUTB(ahc, SXFRCTL1, (scsi_conf & (ENSPCHK|STIMESEL))
| ENSTIMER|ACTNEGEN|STPWEN);
AHC_OUTB(ahc, SIMODE1, ENSELTIMO|ENSCSIRST|ENSCSIPERR);
if (ahc->type & AHC_ULTRA)
AHC_OUTB(ahc, SXFRCTL0, DFON|SPIOEN|ULTRAEN);
else
AHC_OUTB(ahc, SXFRCTL0, DFON|SPIOEN);
if (scsi_conf & RESET_SCSI) {
/* Reset the bus */
if (bootverbose)
printf("%s: Reseting Channel A\n", ahc_name(ahc));
AHC_OUTB(ahc, SCSISEQ, SCSIRSTO);
DELAY(1000);
AHC_OUTB(ahc, SCSISEQ, 0);
/* Ensure we don't get a RSTI interrupt from this */
AHC_OUTB(ahc, CLRSINT1, CLRSCSIRSTI);
AHC_OUTB(ahc, CLRINT, 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("%s: Host Adapter Bios disabled. Using default SCSI "
"device parameters\n", ahc_name(ahc));
ahc->discenable = 0xff;
} else
ahc->discenable = ~((AHC_INB(ahc, DISC_DSB + 1) << 8)
| AHC_INB(ahc, DISC_DSB));
if (!(ahc->type & (AHC_WIDE|AHC_TWIN)))
max_targ = 7;
for (i = 0; i <= max_targ; i++) {
u_int8_t 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 = AHC_INB(ahc, TARG_SCRATCH + i);
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_int8_t 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);
}
}
}
AHC_OUTB(ahc, TARG_SCRATCH+i,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) == 0)
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;
AHC_OUTB(ahc, ULTRA_ENB, ultraenable & 0xff);
AHC_OUTB(ahc, ULTRA_ENB + 1, (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 hardware SCBs
*/
AHC_OUTB(ahc, SCBCOUNT, ahc->scb_data->maxhscbs);
/*
* 2's compliment of maximum tag value
*/
i = ahc->scb_data->maxscbs;
AHC_OUTB(ahc, COMP_SCBCOUNT, -i & 0xff);
/*
* Allocate enough "hardware scbs" to handle
* the maximum number of concurrent transactions
* we can have active. We have to use contigmalloc
* if this array crosses a page boundary since the
* sequencer depends on this array being physically
* contiguous.
*/
if (ahc->scb_data->hscbs == NULL) {
size_t array_size;
u_int32_t hscb_physaddr;
array_size = ahc->scb_data->maxscbs*sizeof(struct hardware_scb);
if (array_size > PAGE_SIZE) {
ahc->scb_data->hscbs = (struct hardware_scb *)
contigmalloc(array_size, M_DEVBUF,
M_NOWAIT, 0ul, 0xffffffff, PAGE_SIZE,
0x10000);
} else {
ahc->scb_data->hscbs = (struct hardware_scb *)
malloc(array_size, M_DEVBUF, M_NOWAIT);
}
if (ahc->scb_data->hscbs == NULL) {
printf("%s: unable to allocate hardware SCB array. "
"Failing attach\n");
return (-1);
}
/* Tell the sequencer where it can find the hscb array. */
hscb_physaddr = vtophys(ahc->scb_data->hscbs);
AHC_OUTB(ahc, HSCB_ADDR0, hscb_physaddr & 0xFF);
AHC_OUTB(ahc, HSCB_ADDR1, (hscb_physaddr >> 8)& 0xFF);
AHC_OUTB(ahc, HSCB_ADDR2, (hscb_physaddr >> 16)& 0xFF);
AHC_OUTB(ahc, HSCB_ADDR3, (hscb_physaddr >> 24)& 0xFF);
}
/*
* Q-Full-Count. Some cards have more Q space
* then SCBs.
*/
if (ahc->type & AHC_AIC7770) {
ahc->qfullcount = 4;
ahc->qcntmask = 0x07;
} else if (ahc->type & AHC_AIC7850) {
ahc->qfullcount = 8;
ahc->qcntmask = 0x0f;
} else if (ahc->scb_data->maxhscbs == 255) {
/* 7870/7880 with external SRAM */
ahc->qfullcount = 255;
ahc->qcntmask = 0xff;
} else {
/* 7870/7880 */
ahc->qfullcount = 16;
ahc->qcntmask = 0x1f;
}
/*
* QCount mask to deal with broken aic7850s that
* sporatically get garbage in the upper bits of
* their QCount registers.
*
* QFullCount to guard against overflowing the
* QINFIFO or QOUTFIFO when we are paging SCBs.
*/
AHC_OUTB(ahc, QCNTMASK, ahc->qcntmask);
AHC_OUTB(ahc, QFULLCNT, ahc->qfullcount);
/* We don't have any waiting selections */
AHC_OUTB(ahc, WAITING_SCBH, SCB_LIST_NULL);
/* Our disconnection list is empty too */
AHC_OUTB(ahc, DISCONNECTED_SCBH, SCB_LIST_NULL);
/* Message out buffer starts empty */
AHC_OUTB(ahc, MSG_LEN, 0x00);
/*
* Load the Sequencer program and Enable the adapter
* in "fast" mode.
*/
if (bootverbose)
printf("%s: Downloading Sequencer Program...",
ahc_name(ahc));
ahc_loadseq(ahc);
if (bootverbose)
printf("Done\n");
AHC_OUTB(ahc, SEQCTL, FASTMODE);
unpause_sequencer(ahc, /*unpause_always*/TRUE);
/*
* 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);
}
#if defined(__NetBSD__)
minphys(bp);
#endif
}
/*
* 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 hardware_scb *hscb;
struct ahc_softc *ahc;
u_int16_t mask;
int flags;
int s;
ahc = (struct ahc_softc *)xs->sc_link->adapter_softc;
mask = (0x01 << (xs->sc_link->target
| (IS_SCSIBUS_B(ahc, xs->sc_link) ? SELBUSB : 0)));
SC_DEBUG(xs->sc_link, SDEV_DB2, ("ahc_scsi_cmd\n"));
flags = xs->flags;
/*
* get an scb to use. If the transfer
* is from a buf (possibly from interrupt time)
* then we can't allow it to sleep
*/
if ((scb = ahc_get_scb(ahc, flags)) == NULL) {
xs->error = XS_DRIVER_STUFFUP;
return (TRY_AGAIN_LATER);
}
hscb = scb->hscb;
SC_DEBUG(xs->sc_link, SDEV_DB3, ("start scb(%p)\n", scb));
scb->xs = xs;
/*
* Put all the arguments for the xfer in the scb
*/
if (ahc->discenable & mask)
hscb->control |= DISCENB;
if (flags & SCSI_RESET) {
scb->flags |= SCB_DEVICE_RESET|SCB_IMMED;
hscb->control |= MK_MESSAGE;
} else if ((ahc->needwdtr & mask) && !(ahc->wdtrpending & mask)) {
ahc->wdtrpending |= mask;
hscb->control |= MK_MESSAGE;
scb->flags |= SCB_MSGOUT_WDTR;
} else if((ahc->needsdtr & mask) && !(ahc->sdtrpending & mask)) {
ahc->sdtrpending |= mask;
hscb->control |= MK_MESSAGE;
scb->flags |= SCB_MSGOUT_SDTR;
} else if (ahc->orderedtag & mask) {
/* XXX this should be handled by the upper SCSI layer */
printf("Ordered Tag sent\n");
hscb->control |= MSG_ORDERED_Q_TAG;
ahc->orderedtag &= ~mask;
} else if (hscb->control & DISCENB) {
if (ahc->tagenable & mask)
hscb->control |= TAG_ENB;
}
hscb->tcl = ((xs->sc_link->target << 4) & 0xF0)
| (IS_SCSIBUS_B(ahc,xs->sc_link)? SELBUSB : 0)
| (xs->sc_link->lun & 0x07);
hscb->cmdlen = xs->cmdlen;
hscb->cmdpointer = vtophys(xs->cmd);
xs->resid = 0;
xs->status = 0;
/* Only use S/G if non-zero length */
if (xs->datalen) {
int seg;
u_int32_t datalen;
vm_offset_t vaddr;
u_int32_t paddr;
u_int32_t nextpaddr;
struct ahc_dma_seg *sg;
seg = 0;
datalen = xs->datalen;
vaddr = (vm_offset_t)xs->data;
paddr = vtophys(vaddr);
sg = scb->ahc_dma;
hscb->SG_list_pointer = vtophys(sg);
while ((datalen > 0) && (seg < AHC_NSEG)) {
/* put in the base address and length */
sg->addr = paddr;
sg->len = 0;
/* do it at least once */
nextpaddr = paddr;
while ((datalen > 0) && (paddr == nextpaddr)) {
u_int32_t size;
/*
* This page is contiguous (physically)
* with the the last, just extend the
* length
*/
/* how far to the end of the page */
nextpaddr = (paddr & (~PAGE_MASK)) + PAGE_SIZE;
/*
* Compute the maximum size
*/
size = nextpaddr - paddr;
if (size > datalen)
size = datalen;
sg->len += size;
vaddr += size;
datalen -= size;
if (datalen > 0)
paddr = vtophys(vaddr);
}
/*
* next page isn't contiguous, finish the seg
*/
seg++;
sg++;
}
hscb->SG_segment_count = seg;
/* Copy the first SG into the data pointer area */
hscb->data = scb->ahc_dma->addr;
hscb->datalen = scb->ahc_dma->len | (SCB_LIST_NULL << 24);
if (datalen) {
/* there's still data, must have run out of segs! */
printf("%s: ahc_scsi_cmd: more than %d DMA segs\n",
ahc_name(ahc), AHC_NSEG);
xs->error = XS_DRIVER_STUFFUP;
ahc_free_scb(ahc, scb);
return (COMPLETE);
}
#ifdef AHC_BROKEN_CACHE
if (ahc_broken_cache)
INVALIDATE_CACHE();
#endif
} else {
/*
* No data xfer, use non S/G values
*/
hscb->SG_segment_count = 0;
hscb->SG_list_pointer = 0;
hscb->data = 0;
hscb->datalen = (SCB_LIST_NULL << 24);
}
#ifdef AHC_DEBUG
if((ahc_debug & AHC_SHOWSCBS) && (xs->sc_link->target == DEBUGTARGET))
ahc_print_scb(scb);
#endif
s = splbio();
STAILQ_INSERT_TAIL(&ahc->waiting_scbs, scb, links);
scb->flags |= SCB_ACTIVE;
ahc_run_waiting_queue(ahc);
if ((flags & SCSI_NOMASK) == 0) {
timeout(ahc_timeout, (caddr_t)scb, (xs->timeout * hz) / 1000);
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) == 0); /* a non command complete intr */
splx(s);
return (COMPLETE);
}
/*
* Look for space in the QINFIFO and queue as many SCBs in the waiting
* queue as possible. Assumes that it is called at splbio().
*/
static void
ahc_run_waiting_queue(ahc)
struct ahc_softc *ahc;
{
struct scb *scb;
/*
* On aic78X0 chips, we rely on Auto Access Pause (AAP)
* instead of doing an explicit pause/unpause.
*/
if ((ahc->type & AHC_AIC78X0) == 0)
pause_sequencer(ahc);
while ((scb = ahc->waiting_scbs.stqh_first) != NULL) {
if (ahc->curqincnt >= ahc->qfullcount) {
ahc->curqincnt = AHC_INB(ahc, QINCNT) & ahc->qcntmask;
if (ahc->curqincnt >= ahc->qfullcount)
/* Still no space */
break;
}
STAILQ_REMOVE_HEAD(&ahc->waiting_scbs, links);
AHC_OUTB(ahc, QINFIFO, scb->hscb->tag);
if ((ahc->flags & AHC_PAGESCBS) != 0)
/*
* We only care about this statistic when paging
* since it is impossible to overflow the qinfifo
* in the non-paging case.
*/
ahc->curqincnt++;
}
if ((ahc->type & AHC_AIC78X0) == 0)
unpause_sequencer(ahc, /*Unpause always*/FALSE);
}
/*
* A scb (and hence an scb entry on the board is put onto the
* free list.
*/
static void
ahc_free_scb(ahc, scb)
struct ahc_softc *ahc;
struct scb *scb;
{
struct hardware_scb *hscb;
int opri;
hscb = scb->hscb;
opri = splbio();
/* Clean up for the next user */
scb->flags = SCB_FREE;
hscb->control = 0;
hscb->status = 0;
STAILQ_INSERT_HEAD(&ahc->scb_data->free_scbs, scb, links);
if (scb->links.stqe_next == NULL) {
/*
* If there were no SCBs availible, wake anybody waiting
* for one to come free.
*/
wakeup((caddr_t)&ahc->scb_data->free_scbs);
}
#ifdef AHC_DEBUG
ahc->activescbs--;
#endif
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_softc *ahc;
u_int32_t flags;
{
struct scb *scbp;
int opri;
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->scb_data->free_scbs.stqh_first)) {
STAILQ_REMOVE_HEAD(&ahc->scb_data->free_scbs, links);
} else if(ahc->scb_data->numscbs < ahc->scb_data->maxscbs) {
scbp = ahc_alloc_scb(ahc);
if (scbp == NULL)
printf("%s: Can't malloc SCB\n", ahc_name(ahc));
} else if ((flags & SCSI_NOSLEEP) == 0) {
tsleep((caddr_t)&ahc->scb_data->free_scbs, PRIBIO,
"ahcscb", 0);
continue;
}
break;
}
#ifdef AHC_DEBUG
if (scbp) {
ahc->activescbs++;
if((ahc_debug & AHC_SHOWSCBCNT)
&& (ahc->activescbs == ahc->scb_data->maxhscbs))
printf("%s: Max SCBs active\n", ahc_name(ahc));
}
#endif
splx(opri);
return (scbp);
}
static struct scb *
ahc_alloc_scb(ahc)
struct ahc_softc *ahc;
{
static struct ahc_dma_seg *next_sg_array = NULL;
static int sg_arrays_free = 0;
struct scb *newscb;
newscb = (struct scb *) malloc(sizeof(struct scb), M_DEVBUF, M_NOWAIT);
if (newscb != NULL) {
bzero(newscb, sizeof(struct scb));
if (next_sg_array == NULL) {
size_t alloc_size = sizeof(struct ahc_dma_seg)
* AHC_NSEG;
sg_arrays_free = PAGE_SIZE / alloc_size;
alloc_size *= sg_arrays_free;
if (alloc_size == 0)
panic("%s: SG list doesn't fit in a page",
ahc_name(ahc));
next_sg_array = (struct ahc_dma_seg *)
malloc(alloc_size, M_DEVBUF, M_NOWAIT);
}
if (next_sg_array != NULL) {
struct hardware_scb *hscb;
newscb->ahc_dma = next_sg_array;
sg_arrays_free--;
if (sg_arrays_free == 0)
next_sg_array = NULL;
else
next_sg_array = &next_sg_array[AHC_NSEG];
hscb = &ahc->scb_data->hscbs[ahc->scb_data->numscbs];
newscb->hscb = hscb;
hscb->control = 0;
hscb->status = 0;
hscb->tag = ahc->scb_data->numscbs;
hscb->residual_data_count[2] = 0;
hscb->residual_data_count[1] = 0;
hscb->residual_data_count[0] = 0;
hscb->residual_SG_segment_count = 0;
ahc->scb_data->numscbs++;
/*
* Place in the scbarray
* Never is removed.
*/
ahc->scb_data->scbarray[hscb->tag] = newscb;
} else {
free(newscb, M_DEVBUF);
newscb = NULL;
}
}
return newscb;
}
static void ahc_loadseq(ahc)
struct ahc_softc *ahc;
{
static u_char seqprog[] = {
# include "aic7xxx_seq.h"
};
AHC_OUTB(ahc, SEQCTL, PERRORDIS|SEQRESET|LOADRAM);
AHC_OUTSB(ahc, SEQRAM, seqprog, sizeof(seqprog));
do {
AHC_OUTB(ahc, SEQCTL, SEQRESET|FASTMODE);
} while ((AHC_INB(ahc, SEQADDR0) != 0)
|| (AHC_INB(ahc, SEQADDR1) != 0));
}
/*
* Function to poll for command completion when
* interrupts are disabled (crash dumps)
*/
static int
ahc_poll(ahc, wait)
struct ahc_softc *ahc;
int wait; /* in msec */
{
while (--wait) {
DELAY(1000);
if (AHC_INB(ahc, INTSTAT) & INT_PEND)
break;
} if (wait == 0) {
printf("%s: board is not responding\n", ahc_name(ahc));
return (EIO);
}
ahc_intr((void *)ahc);
return (0);
}
static void
ahc_timeout(arg)
void *arg;
{
struct scb *scb = (struct scb *)arg;
struct ahc_softc *ahc;
int s, found;
u_char bus_state;
s = splbio();
if (!(scb->flags & SCB_ACTIVE)) {
/* Previous timeout took care of me already */
splx(s);
return;
}
ahc = (struct ahc_softc *)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("%s: Timed-out command times out "
"again\n", ahc_name(ahc));
} else if ((scb->flags & (SCB_ABORTED | SCB_DEVICE_RESET
| SCB_SENTORDEREDTAG)) == 0) {
/*
* 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.
*/
bus_state = AHC_INB(ahc, 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", AHC_INB(ahc, SCSISIGI));
/* Decide our course of action */
if (scb->flags & SCB_ABORTED) {
/*
* Been down this road before.
* Do a full bus reset.
*/
char channel = (scb->hscb->tcl & SELBUSB)
? 'B': 'A';
found = ahc_reset_channel(ahc, channel, scb,
XS_TIMEOUT, /*Initiate Reset*/TRUE);
printf("%s: Issued Channel %c Bus Reset. "
"%d SCBs aborted\n", ahc_name(ahc), channel, found);
ahc->in_timeout = FALSE;
} else if ((scb->hscb->control & TAG_ENB) != 0
&& (scb->flags & SCB_SENTORDEREDTAG) == 0) {
/*
* We could be starving this command
* try sending an ordered tag command
* to the target we come from.
*/
scb->flags |= SCB_SENTORDEREDTAG;
ahc->orderedtag |= 0xFF;
timeout(ahc_timeout, (caddr_t)scb, (5 * hz));
unpause_sequencer(ahc, /*unpause_always*/FALSE);
printf("Ordered Tag queued\n");
} else {
/*
* Send an Abort 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).
* Our strategy here is to queue an abort message
* to the timed out target if it is disconnected.
* Otherwise, if we have an active target we stuff the
* message buffer with an abort message and assert ATN
* in the hopes that the target will let go of the bus
* and go to the mesgout phase. If this fails, we'll
* get another timeout 2 seconds later which will attempt
* a bus reset.
*/
u_int8_t saved_scbptr;
u_int8_t active_scb_index;
struct scb *active_scb;
saved_scbptr = AHC_INB(ahc, SCBPTR);
active_scb_index = AHC_INB(ahc, SCB_TAG);
active_scb = ahc->scb_data->scbarray[active_scb_index];
if (bus_state != 0) {
/* Send the abort to the active SCB */
AHC_OUTB(ahc, MSG_LEN, 1);
AHC_OUTB(ahc, MSG0,
(active_scb->hscb->control & TAG_ENB) == 0 ?
MSG_ABORT : MSG_ABORT_TAG);
AHC_OUTB(ahc, SCSISIGO, bus_state|ATNO);
sc_print_addr(active_scb->xs->sc_link);
printf("abort message in message buffer\n");
active_scb->flags |= SCB_ABORTED;
if (active_scb != scb) {
untimeout(ahc_timeout,
(caddr_t)active_scb);
/* Give scb a new lease on life */
timeout(ahc_timeout, (caddr_t)scb,
(scb->xs->timeout * hz) / 1000);
}
timeout(ahc_timeout, (caddr_t)active_scb, (2 * hz));
unpause_sequencer(ahc, /*unpause_always*/FALSE);
} else {
u_int8_t hscb_index;
int disconnected;
disconnected = FALSE;
hscb_index = find_scb(ahc, scb);
if (hscb_index == SCB_LIST_NULL)
disconnected = TRUE;
else {
AHC_OUTB(ahc, SCBPTR, hscb_index);
if (AHC_INB(ahc, SCB_CONTROL) & DISCONNECTED)
disconnected = TRUE;
}
scb->flags |= SCB_ABORTED;
if (disconnected) {
/* Simply set the ABORT_SCB control bit */
scb->hscb->control |= ABORT_SCB;
if (hscb_index != SCB_LIST_NULL)
AHC_OUTB(ahc, SCB_CONTROL, ABORT_SCB);
timeout(ahc_timeout, (caddr_t)scb, (2 * hz));
}
AHC_OUTB(ahc, SCBPTR, saved_scbptr);
unpause_sequencer(ahc, /*unpause_always*/FALSE);
if (!disconnected)
/* Go "immediatly" to the bus reset */
timeout(ahc_timeout, (caddr_t)scb, hz / 2);
}
}
splx(s);
}
/*
* Look through the SCB array of the card and attempt to find the
* hardware SCB that corresponds to the passed in SCB. Return
* SCB_LIST_NULL if unsuccessful. This routine assumes that the
* card is already paused.
*/
static u_int8_t
find_scb(ahc, scb)
struct ahc_softc *ahc;
struct scb *scb;
{
u_int8_t saved_scbptr;
u_int8_t curindex;
saved_scbptr = AHC_INB(ahc, SCBPTR);
curindex = 0;
for (curindex = 0; curindex < ahc->scb_data->maxhscbs; curindex++) {
AHC_OUTB(ahc, SCBPTR, curindex);
if (AHC_INB(ahc, SCB_TAG) == scb->hscb->tag)
break;
}
AHC_OUTB(ahc, SCBPTR, saved_scbptr);
if (curindex > ahc->scb_data->maxhscbs)
curindex = SCB_LIST_NULL;
return curindex;
}
/*
* 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_softc *ahc;
int target;
char channel;
struct scb *timedout_scb;
u_int32_t xs_error;
{
struct scb *scbp;
u_char active_scb;
int i = 0;
int found = 0;
/* restore this when we're done */
active_scb = AHC_INB(ahc, SCBPTR);
/*
* Search the QINFIFO.
*/
{
u_int8_t saved_queue[AHC_SCB_MAX];
u_int8_t queued = AHC_INB(ahc, QINCNT) & ahc->qcntmask;
for (i = 0; i < (queued - found); i++) {
saved_queue[i] = AHC_INB(ahc, QINFIFO);
scbp = ahc->scb_data->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 != timedout_scb)
untimeout(ahc_timeout, (caddr_t)scbp);
i--;
found++;
}
}
/* Now put the saved scbs back. */
for (queued = 0; queued < i; queued++) {
AHC_OUTB(ahc, QINFIFO, saved_queue[queued]);
}
}
/*
* Search waiting for selection list.
*/
{
u_int8_t next, prev;
next = AHC_INB(ahc, WAITING_SCBH); /* Start at head of list. */
prev = SCB_LIST_NULL;
while (next != SCB_LIST_NULL) {
AHC_OUTB(ahc, SCBPTR, next);
scbp = ahc->scb_data->scbarray[AHC_INB(ahc, SCB_TAG)];
if (ahc_match_scb(scbp, target, channel)) {
next = ahc_abort_wscb(ahc, scbp, next, prev,
timedout_scb, xs_error);
found++;
} else {
prev = next;
next = AHC_INB(ahc, SCB_NEXT);
}
}
}
/*
* 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->scb_data->numscbs; i++) {
scbp = ahc->scb_data->scbarray[i];
if ((scbp->flags & SCB_ACTIVE)
&& ahc_match_scb(scbp, target, channel)) {
/* Ensure the target is "free" */
ahc_unbusy_target(ahc, target, channel);
scbp->flags = SCB_ABORTED|SCB_QUEUED_FOR_DONE;
scbp->xs->error |= xs_error;
if (scbp != timedout_scb)
untimeout(ahc_timeout, (caddr_t)scbp);
found++;
}
}
AHC_OUTB(ahc, SCBPTR, 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, scbpos, prev, timedout_scb, xs_error)
struct ahc_softc *ahc;
struct scb *scbp;
u_int8_t scbpos;
u_int8_t prev;
struct scb *timedout_scb;
u_int32_t xs_error;
{
u_int8_t curscb, next;
int target = ((scbp->hscb->tcl >> 4) & 0x0f);
char channel = (scbp->hscb->tcl & SELBUSB) ? 'B' : 'A';
/*
* Select the SCB we want to abort and
* pull the next pointer out of it.
*/
curscb = AHC_INB(ahc, SCBPTR);
AHC_OUTB(ahc, SCBPTR, scbpos);
next = AHC_INB(ahc, SCB_NEXT);
/* Clear the necessary fields */
AHC_OUTB(ahc, SCB_CONTROL, 0);
AHC_OUTB(ahc, SCB_NEXT, SCB_LIST_NULL);
ahc_unbusy_target(ahc, target, channel);
/* update the waiting list */
if (prev == SCB_LIST_NULL)
/* First in the list */
AHC_OUTB(ahc, WAITING_SCBH, next);
else {
/*
* Select the scb that pointed to us
* and update its next pointer.
*/
AHC_OUTB(ahc, SCBPTR, prev);
AHC_OUTB(ahc, SCB_NEXT, next);
}
/*
* Point us back at the original scb position
* and inform the SCSI system that the command
* has been aborted.
*/
AHC_OUTB(ahc, SCBPTR, curscb);
scbp->flags = SCB_ABORTED|SCB_QUEUED_FOR_DONE;
scbp->xs->error |= xs_error;
if (scbp != timedout_scb)
untimeout(ahc_timeout, (caddr_t)scbp);
return next;
}
static u_int8_t
ahc_unbusy_target(ahc, target, channel)
struct ahc_softc *ahc;
int target;
char channel;
{
u_int8_t active_scb;
u_int8_t info_scb;
u_int8_t busy_scbid;
u_int32_t scb_offset;
info_scb = target / 4;
if (channel == 'B')
info_scb += 2;
active_scb = AHC_INB(ahc, SCBPTR);
AHC_OUTB(ahc, SCBPTR, info_scb);
scb_offset = SCB_ACTIVE0 + (target & 0x03);
busy_scbid = AHC_INB(ahc, scb_offset);
AHC_OUTB(ahc, scb_offset, SCB_LIST_NULL);
AHC_OUTB(ahc, SCBPTR, active_scb);
return busy_scbid;
}
static void
ahc_reset_current_bus(ahc)
struct ahc_softc *ahc;
{
AHC_OUTB(ahc, SCSISEQ, SCSIRSTO);
DELAY(1000);
AHC_OUTB(ahc, SCSISEQ, 0);
}
static int
ahc_reset_channel(ahc, channel, timedout_scb, xs_error, initiate_reset)
struct ahc_softc *ahc;
char channel;
struct scb *timedout_scb;
u_int32_t xs_error;
int initiate_reset;
{
u_int8_t sblkctl;
char cur_channel;
u_int32_t offset, offset_max;
int found;
int target;
int maxtarget;
maxtarget = 8;
/*
* 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;
offset = TARG_SCRATCH + 8;
offset_max = TARG_SCRATCH + 16;
} else if (ahc->type & AHC_WIDE){
ahc->needsdtr = ahc->needsdtr_orig;
ahc->needwdtr = ahc->needwdtr_orig;
ahc->sdtrpending = 0;
ahc->wdtrpending = 0;
maxtarget = 16;
offset = TARG_SCRATCH;
offset_max = TARG_SCRATCH + 16;
} else {
ahc->needsdtr |= (ahc->needsdtr_orig & 0x00ff);
ahc->sdtrpending &= 0xff00;
offset = TARG_SCRATCH;
offset_max = TARG_SCRATCH + 8;
}
for (target = 0; target < maxtarget; target++)
ahc_unbusy_target(ahc, target, channel);
for (; offset < offset_max; offset++) {
/*
* Revert to async/narrow transfers
* until we renegotiate.
*/
u_int8_t targ_scratch;
targ_scratch = AHC_INB(ahc, offset);
targ_scratch &= SXFR;
AHC_OUTB(ahc, offset, targ_scratch);
}
/*
* Reset the bus if we are initiating this reset and
* restart/unpause the sequencer
*/
sblkctl = AHC_INB(ahc, SBLKCTL);
cur_channel = (sblkctl & SELBUSB) ? 'B' : 'A';
if (cur_channel != channel) {
/* Case 1: Command for another bus is active
* Stealthily reset the other bus without
* upsetting the current bus.
*/
AHC_OUTB(ahc, SBLKCTL, sblkctl ^ SELBUSB);
if (initiate_reset)
ahc_reset_current_bus(ahc);
AHC_OUTB(ahc, CLRSINT1, CLRSCSIRSTI|CLRSELTIMEO);
AHC_OUTB(ahc, CLRINT, CLRSCSIINT);
AHC_OUTB(ahc, SBLKCTL, sblkctl);
unpause_sequencer(ahc, /*unpause_always*/TRUE);
} else {
/* Case 2: A command from this bus is active or we're idle */
if (initiate_reset)
ahc_reset_current_bus(ahc);
AHC_OUTB(ahc, CLRSINT1, CLRSCSIRSTI|CLRSELTIMEO);
AHC_OUTB(ahc, CLRINT, CLRSCSIINT);
restart_sequencer(ahc);
}
ahc_run_done_queue(ahc);
return found;
}
void
ahc_run_done_queue(ahc)
struct ahc_softc *ahc;
{
int i;
struct scb *scbp;
for (i = 0; i < ahc->scb_data->numscbs; i++) {
scbp = ahc->scb_data->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->hscb->tcl >> 4) & 0x0f;
char chan = (scb->hscb->tcl & SELBUSB) ? 'B' : 'A';
if (target == ALL_TARGETS)
return (chan == channel);
else
return ((chan == channel) && (targ == target));
}
static void
ahc_construct_sdtr(ahc, start_byte, period, offset)
struct ahc_softc *ahc;
int start_byte;
u_int8_t period;
u_int8_t offset;
{
AHC_OUTB(ahc, MSG0 + start_byte, MSG_EXTENDED);
AHC_OUTB(ahc, MSG1 + start_byte, MSG_EXT_SDTR_LEN);
AHC_OUTB(ahc, MSG2 + start_byte, MSG_EXT_SDTR);
AHC_OUTB(ahc, MSG3 + start_byte, period);
AHC_OUTB(ahc, MSG4 + start_byte, offset);
AHC_OUTB(ahc, MSG_LEN, start_byte + 5);
}
static void
ahc_construct_wdtr(ahc, start_byte, bus_width)
struct ahc_softc *ahc;
int start_byte;
u_int8_t bus_width;
{
AHC_OUTB(ahc, MSG0 + start_byte, MSG_EXTENDED);
AHC_OUTB(ahc, MSG1 + start_byte, MSG_EXT_WDTR_LEN);
AHC_OUTB(ahc, MSG2 + start_byte, MSG_EXT_WDTR);
AHC_OUTB(ahc, MSG3 + start_byte, bus_width);
AHC_OUTB(ahc, MSG_LEN, start_byte + 4);
}
static void
ahc_calc_residual(scb)
struct scb *scb;
{
struct scsi_xfer *xs;
struct hardware_scb *hscb;
int resid_sgs;
xs = scb->xs;
hscb = scb->hscb;
if ((scb->flags & SCB_SENSE) == 0) {
/*
* Remainder of the SG where the transfer
* stopped.
*/
xs->resid = (hscb->residual_data_count[2] <<16) |
(hscb->residual_data_count[1] <<8) |
(hscb->residual_data_count[0]);
/*
* Add up the contents of all residual
* SG segments that are after the SG where
* the transfer stopped.
*/
resid_sgs = hscb->residual_SG_segment_count - 1;
while (resid_sgs > 0) {
int sg;
sg = hscb->SG_segment_count - resid_sgs;
xs->resid += scb->ahc_dma[sg].len;
resid_sgs--;
}
#if defined(__FreeBSD__)
xs->flags |= SCSI_RESID_VALID;
#elif defined(__NetBSD__)
/* XXX - Update to do this right */
#endif
}
/*
* Clean out the residual information in this SCB for the
* next consumer of this SCB.
*/
hscb->residual_data_count[2] = 0;
hscb->residual_data_count[1] = 0;
hscb->residual_data_count[0] = 0;
hscb->residual_SG_segment_count = 0;
#ifdef AHC_DEBUG
if (ahc_debug & AHC_SHOWMISC) {
sc_print_addr(xs->sc_link);
printf("Handled Residual of %ld bytes\n" ,xs->resid);
}
#endif
}
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