drivers/scsi/aic7xxx/aic7770.c - arm/linux - Git at Google

 /*
  * Product specific probe and attach routines for:
  * 	27/284X and aic7770 motherboard SCSI controllers
  *
  * Copyright (c) 1994-1998, 2000, 2001 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, 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.
  *
  * $Id: //depot/aic7xxx/aic7xxx/aic7770.c#32 $
  *
  * $FreeBSD$
  */

 #ifdef __linux__
 #include "aic7xxx_osm.h"
 #include "aic7xxx_inline.h"
 #include "aic7xxx_93cx6.h"
 #else
 #include <dev/aic7xxx/aic7xxx_osm.h>
 #include <dev/aic7xxx/aic7xxx_inline.h>
 #include <dev/aic7xxx/aic7xxx_93cx6.h>
 #endif

 #define ID_AIC7770	0x04907770
 #define ID_AHA_274x	0x04907771
 #define ID_AHA_284xB	0x04907756 /* BIOS enabled */
 #define ID_AHA_284x	0x04907757 /* BIOS disabled*/
 #define	ID_OLV_274x	0x04907782 /* Olivetti OEM */
 #define	ID_OLV_274xD	0x04907783 /* Olivetti OEM (Differential) */

 static int aic7770_chip_init(struct ahc_softc *ahc);
 static int aha2840_load_seeprom(struct ahc_softc *ahc);
 static ahc_device_setup_t ahc_aic7770_VL_setup;
 static ahc_device_setup_t ahc_aic7770_EISA_setup;
 static ahc_device_setup_t ahc_aic7770_setup;

 struct aic7770_identity aic7770_ident_table[] =
 {
 	{
 		ID_AHA_274x,
 		0xFFFFFFFF,
 		"Adaptec 274X SCSI adapter",
 		ahc_aic7770_EISA_setup
 	},
 	{
 		ID_AHA_284xB,
 		0xFFFFFFFE,
 		"Adaptec 284X SCSI adapter",
 		ahc_aic7770_VL_setup
 	},
 	{
 		ID_AHA_284x,
 		0xFFFFFFFE,
 		"Adaptec 284X SCSI adapter (BIOS Disabled)",
 		ahc_aic7770_VL_setup
 	},
 	{
 		ID_OLV_274x,
 		0xFFFFFFFF,
 		"Adaptec (Olivetti OEM) 274X SCSI adapter",
 		ahc_aic7770_EISA_setup
 	},
 	{
 		ID_OLV_274xD,
 		0xFFFFFFFF,
 		"Adaptec (Olivetti OEM) 274X Differential SCSI adapter",
 		ahc_aic7770_EISA_setup
 	},
 	/* Generic chip probes for devices we don't know 'exactly' */
 	{
 		ID_AIC7770,
 		0xFFFFFFFF,
 		"Adaptec aic7770 SCSI adapter",
 		ahc_aic7770_EISA_setup
 	}
 };
 const int ahc_num_aic7770_devs = ARRAY_SIZE(aic7770_ident_table);

 struct aic7770_identity *
 aic7770_find_device(uint32_t id)
 {
 	struct	aic7770_identity *entry;
 	int	i;

 	for (i = 0; i < ahc_num_aic7770_devs; i++) {
 		entry = &aic7770_ident_table[i];
 		if (entry->full_id == (id & entry->id_mask))
 			return (entry);
 	}
 	return (NULL);
 }

 int
 aic7770_config(struct ahc_softc *ahc, struct aic7770_identity *entry, u_int io)
 {
 	int	error;
 	int	have_seeprom;
 	u_int	hostconf;
 	u_int   irq;
 	u_int	intdef;

 	error = entry->setup(ahc);
 	have_seeprom = 0;
 	if (error != 0)
 		return (error);

 	error = aic7770_map_registers(ahc, io);
 	if (error != 0)
 		return (error);

 	/*
 	 * Before we continue probing the card, ensure that
 	 * its interrupts are *disabled*.  We don't want
 	 * a misstep to hang the machine in an interrupt
 	 * storm.
 	 */
 	ahc_intr_enable(ahc, FALSE);

 	ahc->description = entry->name;
 	error = ahc_softc_init(ahc);
 	if (error != 0)
 		return (error);

 	ahc->bus_chip_init = aic7770_chip_init;

 	error = ahc_reset(ahc, /*reinit*/FALSE);
 	if (error != 0)
 		return (error);

 	/* Make sure we have a valid interrupt vector */
 	intdef = ahc_inb(ahc, INTDEF);
 	irq = intdef & VECTOR;
 	switch (irq) {
 	case 9:
 	case 10:
 	case 11:
 	case 12:
 	case 14:
 	case 15:
 		break;
 	default:
 		printk("aic7770_config: invalid irq setting %d\n", intdef);
 		return (ENXIO);
 	}

 	if ((intdef & EDGE_TRIG) != 0)
 		ahc->flags |= AHC_EDGE_INTERRUPT;

 	switch (ahc->chip & (AHC_EISA|AHC_VL)) {
 	case AHC_EISA:
 	{
 		u_int biosctrl;
 		u_int scsiconf;
 		u_int scsiconf1;

 		biosctrl = ahc_inb(ahc, HA_274_BIOSCTRL);
 		scsiconf = ahc_inb(ahc, SCSICONF);
 		scsiconf1 = ahc_inb(ahc, SCSICONF + 1);

 		/* Get the primary channel information */
 		if ((biosctrl & CHANNEL_B_PRIMARY) != 0)
 			ahc->flags |= 1;

 		if ((biosctrl & BIOSMODE) == BIOSDISABLED) {
 			ahc->flags |= AHC_USEDEFAULTS;
 		} else {
 			if ((ahc->features & AHC_WIDE) != 0) {
 				ahc->our_id = scsiconf1 & HWSCSIID;
 				if (scsiconf & TERM_ENB)
 					ahc->flags |= AHC_TERM_ENB_A;
 			} else {
 				ahc->our_id = scsiconf & HSCSIID;
 				ahc->our_id_b = scsiconf1 & HSCSIID;
 				if (scsiconf & TERM_ENB)
 					ahc->flags |= AHC_TERM_ENB_A;
 				if (scsiconf1 & TERM_ENB)
 					ahc->flags |= AHC_TERM_ENB_B;
 			}
 		}
 		if ((ahc_inb(ahc, HA_274_BIOSGLOBAL) & HA_274_EXTENDED_TRANS))
 			ahc->flags |= AHC_EXTENDED_TRANS_A|AHC_EXTENDED_TRANS_B;
 		break;
 	}
 	case AHC_VL:
 	{
 		have_seeprom = aha2840_load_seeprom(ahc);
 		break;
 	}
 	default:
 		break;
 	}
 	if (have_seeprom == 0) {
 		kfree(ahc->seep_config);
 		ahc->seep_config = NULL;
 	}

 	/*
 	 * Ensure autoflush is enabled
 	 */
 	ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) & ~AUTOFLUSHDIS);

 	/* Setup the FIFO threshold and the bus off time */
 	hostconf = ahc_inb(ahc, HOSTCONF);
 	ahc_outb(ahc, BUSSPD, hostconf & DFTHRSH);
 	ahc_outb(ahc, BUSTIME, (hostconf << 2) & BOFF);

 	ahc->bus_softc.aic7770_softc.busspd = hostconf & DFTHRSH;
 	ahc->bus_softc.aic7770_softc.bustime = (hostconf << 2) & BOFF;

 	/*
 	 * Generic aic7xxx initialization.
 	 */
 	error = ahc_init(ahc);
 	if (error != 0)
 		return (error);

 	error = aic7770_map_int(ahc, irq);
 	if (error != 0)
 		return (error);

 	ahc->init_level++;

 	/*
 	 * Enable the board's BUS drivers
 	 */
 	ahc_outb(ahc, BCTL, ENABLE);
 	return (0);
 }

 static int
 aic7770_chip_init(struct ahc_softc *ahc)
 {
 	ahc_outb(ahc, BUSSPD, ahc->bus_softc.aic7770_softc.busspd);
 	ahc_outb(ahc, BUSTIME, ahc->bus_softc.aic7770_softc.bustime);
 	ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) & ~AUTOFLUSHDIS);
 	ahc_outb(ahc, BCTL, ENABLE);
 	return (ahc_chip_init(ahc));
 }

 /*
  * Read the 284x SEEPROM.
  */
 static int
 aha2840_load_seeprom(struct ahc_softc *ahc)
 {
 	struct	seeprom_descriptor sd;
 	struct	seeprom_config *sc;
 	int	have_seeprom;
 	uint8_t scsi_conf;

 	sd.sd_ahc = ahc;
 	sd.sd_control_offset = SEECTL_2840;
 	sd.sd_status_offset = STATUS_2840;
 	sd.sd_dataout_offset = STATUS_2840;
 	sd.sd_chip = C46;
 	sd.sd_MS = 0;
 	sd.sd_RDY = EEPROM_TF;
 	sd.sd_CS = CS_2840;
 	sd.sd_CK = CK_2840;
 	sd.sd_DO = DO_2840;
 	sd.sd_DI = DI_2840;
 	sc = ahc->seep_config;

 	if (bootverbose)
 		printk("%s: Reading SEEPROM...", ahc_name(ahc));
 	have_seeprom = ahc_read_seeprom(&sd, (uint16_t *)sc,
 					/*start_addr*/0, sizeof(*sc)/2);

 	if (have_seeprom) {

 		if (ahc_verify_cksum(sc) == 0) {
 			if(bootverbose)
 				printk ("checksum error\n");
 			have_seeprom = 0;
 		} else if (bootverbose) {
 			printk("done.\n");
 		}
 	}

 	if (!have_seeprom) {
 		if (bootverbose)
 			printk("%s: No SEEPROM available\n", ahc_name(ahc));
 		ahc->flags |= AHC_USEDEFAULTS;
 	} else {
 		/*
 		 * Put the data we've collected down into SRAM
 		 * where ahc_init will find it.
 		 */
 		int	 i;
 		int	 max_targ;
 		uint16_t discenable;

 		max_targ = (ahc->features & AHC_WIDE) != 0 ? 16 : 8;
 		discenable = 0;
 		for (i = 0; i < max_targ; i++){
 			uint8_t target_settings;

 			target_settings = (sc->device_flags[i] & CFXFER) << 4;
 			if (sc->device_flags[i] & CFSYNCH)
 				target_settings |= SOFS;
 			if (sc->device_flags[i] & CFWIDEB)
 				target_settings |= WIDEXFER;
 			if (sc->device_flags[i] & CFDISC)
 				discenable |= (0x01 << i);
 			ahc_outb(ahc, TARG_SCSIRATE + i, target_settings);
 		}
 		ahc_outb(ahc, DISC_DSB, ~(discenable & 0xff));
 		ahc_outb(ahc, DISC_DSB + 1, ~((discenable >> 8) & 0xff));

 		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;

 		if (sc->bios_control & CF284XEXTEND)
 			ahc->flags |= AHC_EXTENDED_TRANS_A;
 		/* Set SCSICONF info */
 		ahc_outb(ahc, SCSICONF, scsi_conf);

 		if (sc->adapter_control & CF284XSTERM)
 			ahc->flags |= AHC_TERM_ENB_A;
 	}
 	return (have_seeprom);
 }

 static int
 ahc_aic7770_VL_setup(struct ahc_softc *ahc)
 {
 	int error;

 	error = ahc_aic7770_setup(ahc);
 	ahc->chip |= AHC_VL;
 	return (error);
 }

 static int
 ahc_aic7770_EISA_setup(struct ahc_softc *ahc)
 {
 	int error;

 	error = ahc_aic7770_setup(ahc);
 	ahc->chip |= AHC_EISA;
 	return (error);
 }

 static int
 ahc_aic7770_setup(struct ahc_softc *ahc)
 {
 	ahc->channel = 'A';
 	ahc->channel_b = 'B';
 	ahc->chip = AHC_AIC7770;
 	ahc->features = AHC_AIC7770_FE;
 	ahc->bugs |= AHC_TMODE_WIDEODD_BUG;
 	ahc->flags |= AHC_PAGESCBS;
 	ahc->instruction_ram_size = 448;
 	return (0);
 }
	/*
	* Product specific probe and attach routines for:
	* 27/284X and aic7770 motherboard SCSI controllers
	*
	* Copyright (c) 1994-1998, 2000, 2001 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, 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.
	*
	* $Id: //depot/aic7xxx/aic7xxx/aic7770.c#32 $
	*
	* $FreeBSD$
	*/

	#ifdef __linux__
	#include "aic7xxx_osm.h"
	#include "aic7xxx_inline.h"
	#include "aic7xxx_93cx6.h"
	#else
	#include <dev/aic7xxx/aic7xxx_osm.h>
	#include <dev/aic7xxx/aic7xxx_inline.h>
	#include <dev/aic7xxx/aic7xxx_93cx6.h>
	#endif

	#define ID_AIC7770 0x04907770
	#define ID_AHA_274x 0x04907771
	#define ID_AHA_284xB 0x04907756 /* BIOS enabled */
	#define ID_AHA_284x 0x04907757 /* BIOS disabled*/
	#define ID_OLV_274x 0x04907782 /* Olivetti OEM */
	#define ID_OLV_274xD 0x04907783 /* Olivetti OEM (Differential) */

	static int aic7770_chip_init(struct ahc_softc *ahc);
	static int aha2840_load_seeprom(struct ahc_softc *ahc);
	static ahc_device_setup_t ahc_aic7770_VL_setup;
	static ahc_device_setup_t ahc_aic7770_EISA_setup;
	static ahc_device_setup_t ahc_aic7770_setup;

	struct aic7770_identity aic7770_ident_table[] =
	{
	{
	ID_AHA_274x,
	0xFFFFFFFF,
	"Adaptec 274X SCSI adapter",
	ahc_aic7770_EISA_setup
	},
	{
	ID_AHA_284xB,
	0xFFFFFFFE,
	"Adaptec 284X SCSI adapter",
	ahc_aic7770_VL_setup
	},
	{
	ID_AHA_284x,
	0xFFFFFFFE,
	"Adaptec 284X SCSI adapter (BIOS Disabled)",
	ahc_aic7770_VL_setup
	},
	{
	ID_OLV_274x,
	0xFFFFFFFF,
	"Adaptec (Olivetti OEM) 274X SCSI adapter",
	ahc_aic7770_EISA_setup
	},
	{
	ID_OLV_274xD,
	0xFFFFFFFF,
	"Adaptec (Olivetti OEM) 274X Differential SCSI adapter",
	ahc_aic7770_EISA_setup
	},
	/* Generic chip probes for devices we don't know 'exactly' */
	{
	ID_AIC7770,
	0xFFFFFFFF,
	"Adaptec aic7770 SCSI adapter",
	ahc_aic7770_EISA_setup
	}
	};
	const int ahc_num_aic7770_devs = ARRAY_SIZE(aic7770_ident_table);

	struct aic7770_identity *
	aic7770_find_device(uint32_t id)
	{
	struct aic7770_identity *entry;
	int i;

	for (i = 0; i < ahc_num_aic7770_devs; i++) {
	entry = &aic7770_ident_table[i];
	if (entry->full_id == (id & entry->id_mask))
	return (entry);
	}
	return (NULL);
	}

	int
	aic7770_config(struct ahc_softc ahc, struct aic7770_identity entry, u_int io)
	{
	int error;
	int have_seeprom;
	u_int hostconf;
	u_int irq;
	u_int intdef;

	error = entry->setup(ahc);
	have_seeprom = 0;
	if (error != 0)
	return (error);

	error = aic7770_map_registers(ahc, io);
	if (error != 0)
	return (error);

	/*
	* Before we continue probing the card, ensure that
	* its interrupts are disabled. We don't want
	* a misstep to hang the machine in an interrupt
	* storm.
	*/
	ahc_intr_enable(ahc, FALSE);

	ahc->description = entry->name;
	error = ahc_softc_init(ahc);
	if (error != 0)
	return (error);

	ahc->bus_chip_init = aic7770_chip_init;

	error = ahc_reset(ahc, /reinit/FALSE);
	if (error != 0)
	return (error);

	/* Make sure we have a valid interrupt vector */
	intdef = ahc_inb(ahc, INTDEF);
	irq = intdef & VECTOR;
	switch (irq) {
	case 9:
	case 10:
	case 11:
	case 12:
	case 14:
	case 15:
	break;
	default:
	printk("aic7770_config: invalid irq setting %d\n", intdef);
	return (ENXIO);
	}

	if ((intdef & EDGE_TRIG) != 0)
	ahc->flags \|= AHC_EDGE_INTERRUPT;

	switch (ahc->chip & (AHC_EISA\|AHC_VL)) {
	case AHC_EISA:
	{
	u_int biosctrl;
	u_int scsiconf;
	u_int scsiconf1;

	biosctrl = ahc_inb(ahc, HA_274_BIOSCTRL);
	scsiconf = ahc_inb(ahc, SCSICONF);
	scsiconf1 = ahc_inb(ahc, SCSICONF + 1);

	/* Get the primary channel information */
	if ((biosctrl & CHANNEL_B_PRIMARY) != 0)
	ahc->flags \|= 1;

	if ((biosctrl & BIOSMODE) == BIOSDISABLED) {
	ahc->flags \|= AHC_USEDEFAULTS;
	} else {
	if ((ahc->features & AHC_WIDE) != 0) {
	ahc->our_id = scsiconf1 & HWSCSIID;
	if (scsiconf & TERM_ENB)
	ahc->flags \|= AHC_TERM_ENB_A;
	} else {
	ahc->our_id = scsiconf & HSCSIID;
	ahc->our_id_b = scsiconf1 & HSCSIID;
	if (scsiconf & TERM_ENB)
	ahc->flags \|= AHC_TERM_ENB_A;
	if (scsiconf1 & TERM_ENB)
	ahc->flags \|= AHC_TERM_ENB_B;
	}
	}
	if ((ahc_inb(ahc, HA_274_BIOSGLOBAL) & HA_274_EXTENDED_TRANS))
	ahc->flags \|= AHC_EXTENDED_TRANS_A\|AHC_EXTENDED_TRANS_B;
	break;
	}
	case AHC_VL:
	{
	have_seeprom = aha2840_load_seeprom(ahc);
	break;
	}
	default:
	break;
	}
	if (have_seeprom == 0) {
	kfree(ahc->seep_config);
	ahc->seep_config = NULL;
	}

	/*
	* Ensure autoflush is enabled
	*/
	ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) & ~AUTOFLUSHDIS);

	/* Setup the FIFO threshold and the bus off time */
	hostconf = ahc_inb(ahc, HOSTCONF);
	ahc_outb(ahc, BUSSPD, hostconf & DFTHRSH);
	ahc_outb(ahc, BUSTIME, (hostconf << 2) & BOFF);

	ahc->bus_softc.aic7770_softc.busspd = hostconf & DFTHRSH;
	ahc->bus_softc.aic7770_softc.bustime = (hostconf << 2) & BOFF;

	/*
	* Generic aic7xxx initialization.
	*/
	error = ahc_init(ahc);
	if (error != 0)
	return (error);

	error = aic7770_map_int(ahc, irq);
	if (error != 0)
	return (error);

	ahc->init_level++;

	/*
	* Enable the board's BUS drivers
	*/
	ahc_outb(ahc, BCTL, ENABLE);
	return (0);
	}

	static int
	aic7770_chip_init(struct ahc_softc *ahc)
	{
	ahc_outb(ahc, BUSSPD, ahc->bus_softc.aic7770_softc.busspd);
	ahc_outb(ahc, BUSTIME, ahc->bus_softc.aic7770_softc.bustime);
	ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) & ~AUTOFLUSHDIS);
	ahc_outb(ahc, BCTL, ENABLE);
	return (ahc_chip_init(ahc));
	}

	/*
	* Read the 284x SEEPROM.
	*/
	static int
	aha2840_load_seeprom(struct ahc_softc *ahc)
	{
	struct seeprom_descriptor sd;
	struct seeprom_config *sc;
	int have_seeprom;
	uint8_t scsi_conf;

	sd.sd_ahc = ahc;
	sd.sd_control_offset = SEECTL_2840;
	sd.sd_status_offset = STATUS_2840;
	sd.sd_dataout_offset = STATUS_2840;
	sd.sd_chip = C46;
	sd.sd_MS = 0;
	sd.sd_RDY = EEPROM_TF;
	sd.sd_CS = CS_2840;
	sd.sd_CK = CK_2840;
	sd.sd_DO = DO_2840;
	sd.sd_DI = DI_2840;
	sc = ahc->seep_config;

	if (bootverbose)
	printk("%s: Reading SEEPROM...", ahc_name(ahc));
	have_seeprom = ahc_read_seeprom(&sd, (uint16_t *)sc,
	/start_addr/0, sizeof(*sc)/2);

	if (have_seeprom) {

	if (ahc_verify_cksum(sc) == 0) {
	if(bootverbose)
	printk ("checksum error\n");
	have_seeprom = 0;
	} else if (bootverbose) {
	printk("done.\n");
	}
	}

	if (!have_seeprom) {
	if (bootverbose)
	printk("%s: No SEEPROM available\n", ahc_name(ahc));
	ahc->flags \|= AHC_USEDEFAULTS;
	} else {
	/*
	* Put the data we've collected down into SRAM
	* where ahc_init will find it.
	*/
	int i;
	int max_targ;
	uint16_t discenable;

	max_targ = (ahc->features & AHC_WIDE) != 0 ? 16 : 8;
	discenable = 0;
	for (i = 0; i < max_targ; i++){
	uint8_t target_settings;

	target_settings = (sc->device_flags[i] & CFXFER) << 4;
	if (sc->device_flags[i] & CFSYNCH)
	target_settings \|= SOFS;
	if (sc->device_flags[i] & CFWIDEB)
	target_settings \|= WIDEXFER;
	if (sc->device_flags[i] & CFDISC)
	discenable \|= (0x01 << i);
	ahc_outb(ahc, TARG_SCSIRATE + i, target_settings);
	}
	ahc_outb(ahc, DISC_DSB, ~(discenable & 0xff));
	ahc_outb(ahc, DISC_DSB + 1, ~((discenable >> 8) & 0xff));

	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;

	if (sc->bios_control & CF284XEXTEND)
	ahc->flags \|= AHC_EXTENDED_TRANS_A;
	/* Set SCSICONF info */
	ahc_outb(ahc, SCSICONF, scsi_conf);

	if (sc->adapter_control & CF284XSTERM)
	ahc->flags \|= AHC_TERM_ENB_A;
	}
	return (have_seeprom);
	}

	static int
	ahc_aic7770_VL_setup(struct ahc_softc *ahc)
	{
	int error;

	error = ahc_aic7770_setup(ahc);
	ahc->chip \|= AHC_VL;
	return (error);
	}

	static int
	ahc_aic7770_EISA_setup(struct ahc_softc *ahc)
	{
	int error;

	error = ahc_aic7770_setup(ahc);
	ahc->chip \|= AHC_EISA;
	return (error);
	}

	static int
	ahc_aic7770_setup(struct ahc_softc *ahc)
	{
	ahc->channel = 'A';
	ahc->channel_b = 'B';
	ahc->chip = AHC_AIC7770;
	ahc->features = AHC_AIC7770_FE;
	ahc->bugs \|= AHC_TMODE_WIDEODD_BUG;
	ahc->flags \|= AHC_PAGESCBS;
	ahc->instruction_ram_size = 448;
	return (0);
	}