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The long awaited stability patch set for the aic7xxx driver:

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Simplify the initialization of adapters by pulling all card specific
initialization to the card specific modules.

Update comments and fix formating.

Pass struct ahc_data*'s to functions instead of unit numbers.

Take advantage of the quad word alignment of SCB fields.

Adapt to new sequencer changes:

	1) Waiting scb list no longer has a tail.

	2) Fill the message buffer as appropriate during a parity error.

	3) Count all of the SGs involved in a residual instead of just
	   the current one.

The reset/abort code still needs a lot of work.

Reviewed by:   David Greenman <davidg@FreeBSd.org>
This commit is contained in:
Justin T. Gibbs 1996-01-03 06:32:12 +00:00
parent dad30388b2
commit 6cb248359e
2 changed files with 465 additions and 733 deletions
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1112
sys/i386/scsi/aic7xxx.c
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File diff suppressed because it is too large Load Diff

86
sys/i386/scsi/aic7xxx.h
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@ -20,7 +20,7 @@
* 4. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: aic7xxx.h,v 1.15 1995/11/04 14:43:30 bde Exp $
* $Id: aic7xxx.h,v 1.16 1995/11/05 04:50:55 gibbs Exp $
*/
#ifndef _AIC7XXX_H_
@ -71,6 +71,12 @@ typedef enum {
AHC_FNONE = 0x00,
AHC_INIT = 0x01,
AHC_RUNNING = 0x02,
AHC_USEDEFAULTS = 0x04, /*
* For cards without an seeprom
* or a BIOS to initialize the chip's
* SRAM, we use the default chip and
* target settings.
*/
AHC_EXTSCB = 0x10, /* External SCBs present */
AHC_CHNLB = 0x20, /*
* Second controller on 3940
@ -81,56 +87,41 @@ typedef enum {
/*
* The driver keeps up to MAX_SCB scb structures per card in memory. Only the
* first 26 bytes of the structure are valid for the hardware, the rest used
* for driver level bookeeping. The "__attribute ((packed))" tags ensure that
* gcc does not attempt to pad the long ints in the structure to word
* boundaries since the first 26 bytes of this structure must have the correct
* offsets for the hardware to find them. The driver is further optimized
* so that we only have to download the first 19 bytes since as long
* as we always use S/G, the last fields should be zero anyway.
* first 26 bytes of the structure need to be transfered to the card during
* normal operation. The remaining fields (next_waiting and host_scb) are
* initialized the first time an SCB is allocated in get_scb(). The fields
* starting at byte 32 are used for kernel level bookeeping.
*/
struct scb {
/* ------------ Begin hardware supported fields ---------------- */
/*1*/ u_char control;
#define SCB_NEEDWDTR 0x80 /* Initiate Wide Negotiation */
#define SCB_DISCENB 0x40 /* Disconnection Enable */
#define SCB_TE 0x20 /* Tag enable */
#define SCB_NEEDSDTR 0x10 /* Initiate Sync Negotiation */
#define SCB_NEEDDMA 0x08 /* Refresh SCB from host ram */
#define SCB_DIS 0x04
#define SCB_TAG_TYPE 0x03
#define SIMPLE_QUEUE 0x00
#define HEAD_QUEUE 0x01
#define OR_QUEUE 0x02
/*2*/ u_char target_channel_lun; /* 4/1/3 bits */
/*0*/ u_char control;
/*1*/ u_char target_channel_lun; /* 4/1/3 bits */
/*2*/ u_char target_status;
/*3*/ u_char SG_segment_count;
/*7*/ physaddr SG_list_pointer __attribute__ ((packed));
/*11*/ physaddr cmdpointer __attribute__ ((packed));
/*12*/ u_char cmdlen;
/*14*/ u_char RESERVED[2]; /* must be zero */
/*15*/ u_char target_status;
/*18*/ u_char residual_data_count[3];
/*19*/ u_char residual_SG_segment_count;
/*23*/ physaddr data __attribute__ ((packed));
/*26*/ u_char datalen[3];
#define SCB_DOWN_SIZE 26 /* amount to actually download */
#define SCB_UP_SIZE 26 /*
* amount we need to upload to perform
* a request sense.
/*4*/ physaddr SG_list_pointer;
/*8*/ u_char residual_SG_segment_count;
/*9*/ u_char residual_data_count[3];
/*12*/ physaddr data;
/*16*/ u_long datalen; /* Really only three bits, but its
* faster to treat it as a long on
* a quad boundary.
*/
/*30*/ physaddr host_scb __attribute__ ((packed));
/*31*/ u_char next_waiting; /* Used to thread SCBs awaiting
/*20*/ physaddr cmdpointer;
/*24*/ u_char cmdlen;
/*25*/ u_char RESERVED[2]; /* must be zero */
#define SCB_PIO_TRANSFER_SIZE 26 /*
* amount we need to upload/download
* via rep in/outsb to perform
* a request sense. The second
* RESERVED byte is initialized to
* 0 in get_scb().
*/
/*27*/ u_char next_waiting; /* Used to thread SCBs awaiting
* selection
*/
#define SCB_LIST_NULL 0xff /* SCB list equivelent to NULL */
#if 0
/*
* No real point in transferring this to the
* SCB registers.
*/
unsigned char RESERVED[1];
#endif
/*-----------------end of hardware supported fields----------------*/
/*28*/ physaddr host_scb;
#define SCB_HARDWARE_SIZE 32
/*-----------------end of hardware supported fields----------------*/
struct scb *next; /* in free list */
struct scsi_xfer *xs; /* the scsi_xfer for this cmd */
int flags;
@ -179,7 +170,8 @@ struct ahc_data {
#define AHC_SHOWSCBS 0x0004
#define AHC_SHOWABORTS 0x0008
#define AHC_SHOWSENSE 0x0010
#define AHC_DEBUG
#define AHC_SHOWSCBCNT 0x0020
/* #define AHC_DEBUG */
extern int ahc_debug; /* Initialized in i386/scsi/aic7xxx.c */
@ -214,8 +206,8 @@ extern struct ahc_data *ahcdata[NAHC];
void ahc_reset __P((u_long iobase));
struct ahc_data *ahc_alloc __P((int unit, u_long io_base, ahc_type type, ahc_flag flags));
void ahc_free __P((struct ahc_data *));
int ahc_init __P((int unit));
int ahc_attach __P((int unit));
int ahc_init __P((struct ahc_data *));
int ahc_attach __P((struct ahc_data *));
void ahc_eisa_intr __P((void *arg));
int ahcintr __P((void *arg));