/* $NetBSD: aic7xxx_seeprom.c,v 1.14 2022/09/25 18:43:32 thorpej Exp $ */

/* $NetBSD: aic7xxx_seeprom.c,v 1.14 2022/09/25 18:43:32 thorpej Exp $ */

/*
* Product specific probe and attach routines for:
* 3940, 2940, aic7895, aic7890, aic7880,
* aic7870, aic7860 and aic7850 SCSI controllers
*
* Copyright (c) 1994-2001 Justin T. Gibbs.
* Copyright (c) 2000-2001 Adaptec Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*
* This file was originally split off from the PCI code by
* Jason Thorpe <[email protected]>. This version was split off
* from the FreeBSD source file aic7xxx_pci.c by Frank van der Linden
* <[email protected]>
*
* $Id: aic7xxx_seeprom.c,v 1.14 2022/09/25 18:43:32 thorpej Exp $
*
* $FreeBSD: src/sys/dev/aic7xxx/aic7xxx_pci.c,v 1.22 2003/01/20 20:44:55 gibbs Exp $
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: aic7xxx_seeprom.c,v 1.14 2022/09/25 18:43:32 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/queue.h>
#include <sys/device.h>
#include <sys/reboot.h> /* for AB_* needed by bootverbose */

#include <sys/bus.h>
#include <sys/intr.h>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>

#include <dev/ic/aic7xxx_osm.h>
#include <dev/ic/aic7xxx_inline.h>

#include <dev/ic/smc93cx6var.h>

#define DEVCONFIG 0x40
#define STPWLEVEL 0x00000002

static void configure_termination(struct ahc_softc *,
struct seeprom_descriptor *, u_int, u_int *);
static int verify_seeprom_cksum(struct seeprom_config *sc);

static void ahc_new_term_detect(struct ahc_softc *, int *, int *, int *,
int *, int *);
static void aic787X_cable_detect(struct ahc_softc *, int *, int *, int *,
int *);
static void aic785X_cable_detect(struct ahc_softc *, int *, int *, int *);
static void write_brdctl(struct ahc_softc *, u_int8_t);
static u_int8_t read_brdctl(struct ahc_softc *);
static void ahc_parse_pci_eeprom(struct ahc_softc *, struct seeprom_config *);

/*
* Check the external port logic for a serial eeprom
* and termination/cable detection contrls.
*/
void
ahc_check_extport(struct ahc_softc *ahc, u_int *sxfrctl1)
{
struct seeprom_descriptor sd;
struct seeprom_config *sc;
int have_seeprom;
int have_autoterm;

sd.sd_tag = ahc->tag;
sd.sd_bsh = ahc->bsh;
sd.sd_regsize = 1;
sd.sd_control_offset = SEECTL;
sd.sd_status_offset = SEECTL;
sd.sd_dataout_offset = SEECTL;
sc = ahc->seep_config;

/*
* For some multi-channel devices, the c46 is simply too
* small to work. For the other controller types, we can
* get our information from either SEEPROM type. Set the
* type to start our probe with accordingly.
*/
if (ahc->flags & AHC_LARGE_SEEPROM)
sd.sd_chip = C56_66;
else
sd.sd_chip = C46;

sd.sd_MS = SEEMS;
sd.sd_RDY = SEERDY;
sd.sd_CS = SEECS;
sd.sd_CK = SEECK;
sd.sd_DO = SEEDO;
sd.sd_DI = SEEDI;

have_seeprom = ahc_acquire_seeprom(ahc, &sd);
if (have_seeprom) {

if (bootverbose)
printf("%s: Reading SEEPROM...", ahc_name(ahc));

for (;;) {
u_int start_addr;

start_addr = 32 * (ahc->channel - 'A');
have_seeprom = read_seeprom(&sd, (uint16_t *)sc,
start_addr,
sizeof(*sc)/2);

if (have_seeprom)
have_seeprom = verify_seeprom_cksum(sc);

if (have_seeprom != 0 || sd.sd_chip == C56_66) {
if (bootverbose) {
if (have_seeprom == 0)
printf ("checksum error\n");
else
printf ("done.\n");
}
break;
}
sd.sd_chip = C56_66;
}
ahc_release_seeprom(&sd);
}

if (!have_seeprom) {
/*
* Pull scratch ram settings and treat them as
* if they are the contents of an seeprom if
* the 'ADPT' signature is found in SCB2.
* We manually compose the data as 16bit values
* to avoid endian issues.
*/
ahc_outb(ahc, SCBPTR, 2);
if (ahc_inb(ahc, SCB_BASE) == 'A'
&& ahc_inb(ahc, SCB_BASE + 1) == 'D'
&& ahc_inb(ahc, SCB_BASE + 2) == 'P'
&& ahc_inb(ahc, SCB_BASE + 3) == 'T') {
uint16_t *sc_data;
int i;

sc_data = (uint16_t *)sc;
for (i = 0; i < 32; i++, sc_data++) {
int j;

j = i * 2;
*sc_data = ahc_inb(ahc, SRAM_BASE + j)
| ahc_inb(ahc, SRAM_BASE + j + 1) << 8;
}
have_seeprom = verify_seeprom_cksum(sc);
if (have_seeprom)
ahc->flags |= AHC_SCB_CONFIG_USED;
}
/*
* Clear any SCB parity errors in case this data and
* its associated parity was not initialized by the BIOS
*/
ahc_outb(ahc, CLRINT, CLRPARERR);
ahc_outb(ahc, CLRINT, CLRBRKADRINT);
}

if (!have_seeprom) {
if (bootverbose)
printf("%s: No SEEPROM available.\n", ahc_name(ahc));
ahc->flags |= AHC_USEDEFAULTS;
free(ahc->seep_config, M_DEVBUF);
ahc->seep_config = NULL;
sc = NULL;
} else {
ahc_parse_pci_eeprom(ahc, sc);
}

/*
* Cards that have the external logic necessary to talk to
* a SEEPROM, are almost certain to have the remaining logic
* necessary for auto-termination control. This assumption
* hasn't failed yet...
*/
have_autoterm = have_seeprom;

/*
* Some low-cost chips have SEEPROM and auto-term control built
* in, instead of using a GAL. They can tell us directly
* if the termination logic is enabled.
*/
if ((ahc->features & AHC_SPIOCAP) != 0) {
if ((ahc_inb(ahc, SPIOCAP) & SSPIOCPS) == 0)
have_autoterm = FALSE;
}

if (have_autoterm) {
ahc_acquire_seeprom(ahc, &sd);
configure_termination(ahc, &sd, sc->adapter_control, sxfrctl1);
ahc_release_seeprom(&sd);
} else if (have_seeprom) {
*sxfrctl1 &= ~STPWEN;
if ((sc->adapter_control & CFSTERM) != 0)
*sxfrctl1 |= STPWEN;
if (bootverbose)
printf("%s: Low byte termination %sabled\n",
ahc_name(ahc),
(*sxfrctl1 & STPWEN) ? "en" : "dis");
}
}

static void
ahc_parse_pci_eeprom(struct ahc_softc *ahc, struct seeprom_config *sc)
{
/*
* Put the data we've collected down into SRAM
* where ahc_init will find it.
*/
int i;
int max_targ = sc->max_targets & CFMAXTARG;
u_int scsi_conf;
uint16_t discenable;
uint16_t ultraenb;

discenable = 0;
ultraenb = 0;
if ((sc->adapter_control & CFULTRAEN) != 0) {
/*
* Determine if this adapter has a "newstyle"
* SEEPROM format.
*/
for (i = 0; i < max_targ; i++) {
if ((sc->device_flags[i] & CFSYNCHISULTRA) != 0) {
ahc->flags |= AHC_NEWEEPROM_FMT;
break;
}
}
}

for (i = 0; i < max_targ; i++) {
u_int scsirate;
uint16_t target_mask;

target_mask = 0x01 << i;
if (sc->device_flags[i] & CFDISC)
discenable |= target_mask;
if ((ahc->flags & AHC_NEWEEPROM_FMT) != 0) {
if ((sc->device_flags[i] & CFSYNCHISULTRA) != 0)
ultraenb |= target_mask;
} else if ((sc->adapter_control & CFULTRAEN) != 0) {
ultraenb |= target_mask;
}
if ((sc->device_flags[i] & CFXFER) == 0x04
&& (ultraenb & target_mask) != 0) {
/* Treat 10MHz as a non-ultra speed */
sc->device_flags[i] &= ~CFXFER;
ultraenb &= ~target_mask;
}
if ((ahc->features & AHC_ULTRA2) != 0) {
u_int offset;

if (sc->device_flags[i] & CFSYNCH)
offset = MAX_OFFSET_ULTRA2;
else
offset = 0;
ahc_outb(ahc, TARG_OFFSET + i, offset);

/*
* The ultra enable bits contain the
* high bit of the ultra2 sync rate
* field.
*/
scsirate = (sc->device_flags[i] & CFXFER)
| ((ultraenb & target_mask) ? 0x8 : 0x0);
if (sc->device_flags[i] & CFWIDEB)
scsirate |= WIDEXFER;
} else {
scsirate = (sc->device_flags[i] & CFXFER) << 4;
if (sc->device_flags[i] & CFSYNCH)
scsirate |= SOFS;
if (sc->device_flags[i] & CFWIDEB)
scsirate |= WIDEXFER;
}
ahc_outb(ahc, TARG_SCSIRATE + i, scsirate);
}
ahc->our_id = sc->brtime_id & CFSCSIID;

scsi_conf = (ahc->our_id & 0x7);
if (sc->adapter_control & CFSPARITY)
scsi_conf |= ENSPCHK;
if (sc->adapter_control & CFRESETB)
scsi_conf |= RESET_SCSI;

ahc->flags |= (sc->adapter_control & CFBOOTCHAN) >> CFBOOTCHANSHIFT;

if (sc->bios_control & CFEXTEND)
ahc->flags |= AHC_EXTENDED_TRANS_A;

if (sc->bios_control & CFBIOSEN)
ahc->flags |= AHC_BIOS_ENABLED;
if (ahc->features & AHC_ULTRA
&& (ahc->flags & AHC_NEWEEPROM_FMT) == 0) {
/* Should we enable Ultra mode? */
if (!(sc->adapter_control & CFULTRAEN))
/* Treat us as a non-ultra card */
ultraenb = 0;
}

if (sc->signature == CFSIGNATURE
|| sc->signature == CFSIGNATURE2) {
uint32_t devconfig;

/* Honor the STPWLEVEL settings */
devconfig = pci_conf_read(ahc->bd->pc, ahc->bd->tag, DEVCONFIG);
devconfig &= ~STPWLEVEL;
if ((sc->bios_control & CFSTPWLEVEL) != 0)
devconfig |= STPWLEVEL;
pci_conf_write(ahc->bd->pc, ahc->bd->tag, DEVCONFIG, devconfig);
}
/* Set SCSICONF info */
ahc_outb(ahc, SCSICONF, scsi_conf);
ahc_outb(ahc, DISC_DSB, ~(discenable & 0xff));
ahc_outb(ahc, DISC_DSB + 1, ~((discenable >> 8) & 0xff));
ahc_outb(ahc, ULTRA_ENB, ultraenb & 0xff);
ahc_outb(ahc, ULTRA_ENB + 1, (ultraenb >> 8) & 0xff);
}

static void
configure_termination(struct ahc_softc *ahc,
struct seeprom_descriptor *sd,
u_int adapter_control,
u_int *sxfrctl1)
{
uint8_t brddat;

brddat = 0;

/*
* Update the settings in sxfrctl1 to match the
* termination settings
*/
*sxfrctl1 = 0;

/*
* SEECS must be on for the GALS to latch
* the data properly. Be sure to leave MS
* on or we will release the seeprom.
*/
SEEPROM_OUTB(sd, sd->sd_MS | sd->sd_CS);
if ((adapter_control & CFAUTOTERM) != 0
|| (ahc->features & AHC_NEW_TERMCTL) != 0) {
int internal50_present;
int internal68_present;
int externalcable_present;
int eeprom_present;
int enableSEC_low;
int enableSEC_high;
int enablePRI_low;
int enablePRI_high;
int sum;

enableSEC_low = 0;
enableSEC_high = 0;
enablePRI_low = 0;
enablePRI_high = 0;
if ((ahc->features & AHC_NEW_TERMCTL) != 0) {
ahc_new_term_detect(ahc, &enableSEC_low,
&enableSEC_high,
&enablePRI_low,
&enablePRI_high,
&eeprom_present);
if ((adapter_control & CFSEAUTOTERM) == 0) {
if (bootverbose)
printf("%s: Manual SE Termination\n",
ahc_name(ahc));
enableSEC_low = (adapter_control & CFSELOWTERM);
enableSEC_high =
(adapter_control & CFSEHIGHTERM);
}
if ((adapter_control & CFAUTOTERM) == 0) {
if (bootverbose)
printf("%s: Manual LVD Termination\n",
ahc_name(ahc));
enablePRI_low = (adapter_control & CFSTERM);
enablePRI_high = (adapter_control & CFWSTERM);
}
/* Make the table calculations below happy */
internal50_present = 0;
internal68_present = 1;
externalcable_present = 1;
} else if ((ahc->features & AHC_SPIOCAP) != 0) {
aic785X_cable_detect(ahc, &internal50_present,
&externalcable_present,
&eeprom_present);
/* Can never support a wide connector. */
internal68_present = 0;
} else {
aic787X_cable_detect(ahc, &internal50_present,
&internal68_present,
&externalcable_present,
&eeprom_present);
}

if ((ahc->features & AHC_WIDE) == 0)
internal68_present = 0;

if (bootverbose
&& (ahc->features & AHC_ULTRA2) == 0) {
printf("%s: internal 50 cable %s present",
ahc_name(ahc),
internal50_present ? "is":"not");

if ((ahc->features & AHC_WIDE) != 0)
printf(", internal 68 cable %s present",
internal68_present ? "is":"not");
printf("\n%s: external cable %s present\n",
ahc_name(ahc),
externalcable_present ? "is":"not");
}
if (bootverbose)
printf("%s: BIOS eeprom %s present\n",
ahc_name(ahc), eeprom_present ? "is" : "not");

if ((ahc->flags & AHC_INT50_SPEEDFLEX) != 0) {
/*
* The 50 pin connector is a separate bus,
* so force it to always be terminated.
* In the future, perform current sensing
* to determine if we are in the middle of
* a properly terminated bus.
*/
internal50_present = 0;
}

/*
* Now set the termination based on what
* we found.
* Flash Enable = BRDDAT7
* Secondary High Term Enable = BRDDAT6
* Secondary Low Term Enable = BRDDAT5 (7890)
* Primary High Term Enable = BRDDAT4 (7890)
*/
if ((ahc->features & AHC_ULTRA2) == 0
&& (internal50_present != 0)
&& (internal68_present != 0)
&& (externalcable_present != 0)) {
printf("%s: Illegal cable configuration!!. "
"Only two connectors on the "
"adapter may be used at a "
"time!\n", ahc_name(ahc));

/*
* Pretend there are no cables in the hope
* that having all of the termination on
* gives us a more stable bus.
*/
internal50_present = 0;
internal68_present = 0;
externalcable_present = 0;
}

if ((ahc->features & AHC_WIDE) != 0
&& ((externalcable_present == 0)
|| (internal68_present == 0)
|| (enableSEC_high != 0))) {
brddat |= BRDDAT6;
if (bootverbose) {
if ((ahc->flags & AHC_INT50_SPEEDFLEX) != 0)
printf("%s: 68 pin termination "
"Enabled\n", ahc_name(ahc));
else
printf("%s: %sHigh byte termination "
"Enabled\n", ahc_name(ahc),
enableSEC_high ? "Secondary "
: "");
}
}

sum = internal50_present + internal68_present
+ externalcable_present;
if (sum < 2 || (enableSEC_low != 0)) {
if ((ahc->features & AHC_ULTRA2) != 0)
brddat |= BRDDAT5;
else
*sxfrctl1 |= STPWEN;
if (bootverbose) {
if ((ahc->flags & AHC_INT50_SPEEDFLEX) != 0)
printf("%s: 50 pin termination "
"Enabled\n", ahc_name(ahc));
else
printf("%s: %sLow byte termination "
"Enabled\n", ahc_name(ahc),
enableSEC_low ? "Secondary "
: "");
}
}

if (enablePRI_low != 0) {
*sxfrctl1 |= STPWEN;
if (bootverbose)
printf("%s: Primary Low Byte termination "
"Enabled\n", ahc_name(ahc));
}

/*
* Setup STPWEN before setting up the rest of
* the termination per the tech note on the U160 cards.
*/
ahc_outb(ahc, SXFRCTL1, *sxfrctl1);

if (enablePRI_high != 0) {
brddat |= BRDDAT4;
if (bootverbose)
printf("%s: Primary High Byte "
"termination Enabled\n",
ahc_name(ahc));
}

write_brdctl(ahc, brddat);

} else {
if ((adapter_control & CFSTERM) != 0) {
*sxfrctl1 |= STPWEN;

if (bootverbose)
printf("%s: %sLow byte termination Enabled\n",
ahc_name(ahc),
(ahc->features & AHC_ULTRA2) ? "Primary "
: "");
}

if ((adapter_control & CFWSTERM) != 0
&& (ahc->features & AHC_WIDE) != 0) {
brddat |= BRDDAT6;
if (bootverbose)
printf("%s: %sHigh byte termination Enabled\n",
ahc_name(ahc),
(ahc->features & AHC_ULTRA2)
? "Secondary " : "");
}

/*
* Setup STPWEN before setting up the rest of
* the termination per the tech note on the U160 cards.
*/
ahc_outb(ahc, SXFRCTL1, *sxfrctl1);

if ((ahc->features & AHC_WIDE) != 0)
write_brdctl(ahc, brddat);
}
SEEPROM_OUTB(sd, sd->sd_MS); /* Clear CS */
}

static void
ahc_new_term_detect(struct ahc_softc *ahc, int *enableSEC_low,
int *enableSEC_high, int *enablePRI_low,
int *enablePRI_high, int *eeprom_present)
{
uint8_t brdctl;

/*
* BRDDAT7 = Eeprom
* BRDDAT6 = Enable Secondary High Byte termination
* BRDDAT5 = Enable Secondary Low Byte termination
* BRDDAT4 = Enable Primary high byte termination
* BRDDAT3 = Enable Primary low byte termination
*/
brdctl = read_brdctl(ahc);
*eeprom_present = brdctl & BRDDAT7;
*enableSEC_high = (brdctl & BRDDAT6);
*enableSEC_low = (brdctl & BRDDAT5);
*enablePRI_high = (brdctl & BRDDAT4);
*enablePRI_low = (brdctl & BRDDAT3);
}

static void
aic787X_cable_detect(struct ahc_softc *ahc, int *internal50_present,
int *internal68_present, int *externalcable_present,
int *eeprom_present)
{
uint8_t brdctl;

/*
* First read the status of our cables.
* Set the rom bank to 0 since the
* bank setting serves as a multiplexor
* for the cable detection logic.
* BRDDAT5 controls the bank switch.
*/
write_brdctl(ahc, 0);

/*
* Now read the state of the internal
* connectors. BRDDAT6 is INT50 and
* BRDDAT7 is INT68.
*/
brdctl = read_brdctl(ahc);
*internal50_present = (brdctl & BRDDAT6) ? 0 : 1;
*internal68_present = (brdctl & BRDDAT7) ? 0 : 1;

/*
* Set the rom bank to 1 and determine
* the other signals.
*/
write_brdctl(ahc, BRDDAT5);

/*
* Now read the state of the external
* connectors. BRDDAT6 is EXT68 and
* BRDDAT7 is EPROMPS.
*/
brdctl = read_brdctl(ahc);
*externalcable_present = (brdctl & BRDDAT6) ? 0 : 1;
*eeprom_present = (brdctl & BRDDAT7) ? 1 : 0;
}

static void
aic785X_cable_detect(struct ahc_softc *ahc, int *internal50_present,
int *externalcable_present, int *eeprom_present)
{
uint8_t brdctl;
uint8_t spiocap;

spiocap = ahc_inb(ahc, SPIOCAP);
spiocap &= ~SOFTCMDEN;
spiocap |= EXT_BRDCTL;
ahc_outb(ahc, SPIOCAP, spiocap);
ahc_outb(ahc, BRDCTL, BRDRW|BRDCS);
ahc_outb(ahc, BRDCTL, 0);
brdctl = ahc_inb(ahc, BRDCTL);
*internal50_present = (brdctl & BRDDAT5) ? 0 : 1;
*externalcable_present = (brdctl & BRDDAT6) ? 0 : 1;

*eeprom_present = (ahc_inb(ahc, SPIOCAP) & EEPROM) ? 1 : 0;
}

int
ahc_acquire_seeprom(struct ahc_softc *ahc, struct seeprom_descriptor *sd)
{
int wait;

if ((ahc->features & AHC_SPIOCAP) != 0
&& (ahc_inb(ahc, SPIOCAP) & SEEPROM) == 0)
return (0);

/*
* Request access of the memory port. When access is
* granted, SEERDY will go high. We use a 1 second
* timeout which should be near 1 second more than
* is needed. Reason: after the chip reset, there
* should be no contention.
*/
SEEPROM_OUTB(sd, sd->sd_MS);
wait = 1000; /* 1 second timeout in msec */
while (--wait && ((SEEPROM_STATUS_INB(sd) & sd->sd_RDY) == 0)) {
ahc_delay(1000); /* delay 1 msec */
}
if ((SEEPROM_STATUS_INB(sd) & sd->sd_RDY) == 0) {
SEEPROM_OUTB(sd, 0);
return (0);
}
return(1);
}

void
ahc_release_seeprom(struct seeprom_descriptor *sd)
{
/* Release access to the memory port and the serial EEPROM. */
SEEPROM_OUTB(sd, 0);
}

static void
write_brdctl(struct ahc_softc *ahc, uint8_t value)
{
uint8_t brdctl;

if ((ahc->chip & AHC_CHIPID_MASK) == AHC_AIC7895) {
brdctl = BRDSTB;
if (ahc->channel == 'B')
brdctl |= BRDCS;
} else if ((ahc->features & AHC_ULTRA2) != 0) {
brdctl = 0;
} else {
brdctl = BRDSTB|BRDCS;
}
ahc_outb(ahc, BRDCTL, brdctl);
ahc_flush_device_writes(ahc);
brdctl |= value;
ahc_outb(ahc, BRDCTL, brdctl);
ahc_flush_device_writes(ahc);
if ((ahc->features & AHC_ULTRA2) != 0)
brdctl |= BRDSTB_ULTRA2;
else
brdctl &= ~BRDSTB;
ahc_outb(ahc, BRDCTL, brdctl);
ahc_flush_device_writes(ahc);
if ((ahc->features & AHC_ULTRA2) != 0)
brdctl = 0;
else
brdctl &= ~BRDCS;
ahc_outb(ahc, BRDCTL, brdctl);
}

static uint8_t
read_brdctl(struct ahc_softc *ahc)
{
uint8_t brdctl;
uint8_t value;

if ((ahc->chip & AHC_CHIPID_MASK) == AHC_AIC7895) {
brdctl = BRDRW;
if (ahc->channel == 'B')
brdctl |= BRDCS;
} else if ((ahc->features & AHC_ULTRA2) != 0) {
brdctl = BRDRW_ULTRA2;
} else {
brdctl = BRDRW|BRDCS;
}
ahc_outb(ahc, BRDCTL, brdctl);
ahc_flush_device_writes(ahc);
value = ahc_inb(ahc, BRDCTL);
ahc_outb(ahc, BRDCTL, 0);
return (value);
}

static int
verify_seeprom_cksum(struct seeprom_config *sc)
{
int i;
int maxaddr;
uint32_t checksum;
uint16_t *scarray;

maxaddr = (sizeof(*sc)/2) - 1;
checksum = 0;
scarray = (uint16_t *)sc;

for (i = 0; i < maxaddr; i++)
checksum = checksum + scarray[i];
if (checksum == 0
|| (checksum & 0xFFFF) != sc->checksum) {
return (0);
} else {
return(1);
}
}