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linux-next/drivers/scsi/aha1542.h
Jeff Garzik f281233d3e SCSI host lock push-down 
Move the mid-layer's ->queuecommand() invocation from being locked
with the host lock to being unlocked to facilitate speeding up the
critical path for drivers who don't need this lock taken anyway.

The patch below presents a simple SCSI host lock push-down as an
equivalent transformation.  No locking or other behavior should change
with this patch.  All existing bugs and locking orders are preserved.

Additionally, add one parameter to queuecommand,
	struct Scsi_Host *
and remove one parameter from queuecommand,
	void (*done)(struct scsi_cmnd *)

Scsi_Host* is a convenient pointer that most host drivers need anyway,
and 'done' is redundant to struct scsi_cmnd->scsi_done.

Minimal code disturbance was attempted with this change.  Most drivers
needed only two one-line modifications for their host lock push-down.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-16 13:33:23 -08:00

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#ifndef _AHA1542_H
/* $Id: aha1542.h,v 1.1 1992/07/24 06:27:38 root Exp root $
*
* Header file for the adaptec 1542 driver for Linux
*
* $Log: aha1542.h,v $
* Revision 1.1 1992/07/24 06:27:38 root
* Initial revision
*
* Revision 1.2 1992/07/04 18:41:49 root
* Replaced distribution with current drivers
*
* Revision 1.3 1992/06/23 23:58:20 root
* Fixes.
*
* Revision 1.2 1992/05/26 22:13:23 root
* Changed bug that prevented DMA above first 2 mbytes.
*
* Revision 1.1 1992/05/22 21:00:29 root
* Initial revision
*
* Revision 1.1 1992/04/24 18:01:50 root
* Initial revision
*
* Revision 1.1 1992/04/02 03:23:13 drew
* Initial revision
*
* Revision 1.3 1992/01/27 14:46:29 tthorn
* *** empty log message ***
*
*/
#include <linux/types.h>
/* I/O Port interface 4.2 */
/* READ */
#define STATUS(base) base
#define STST 0x80 /* Self Test in Progress */
#define DIAGF 0x40 /* Internal Diagnostic Failure */
#define INIT 0x20 /* Mailbox Initialization Required */
#define IDLE 0x10 /* SCSI Host Adapter Idle */
#define CDF 0x08 /* Command/Data Out Port Full */
#define DF 0x04 /* Data In Port Full */
#define INVDCMD 0x01 /* Invalid H A Command */
#define STATMASK 0xfd /* 0x02 is reserved */
#define INTRFLAGS(base) (STATUS(base)+2)
#define ANYINTR 0x80 /* Any Interrupt */
#define SCRD 0x08 /* SCSI Reset Detected */
#define HACC 0x04 /* HA Command Complete */
#define MBOA 0x02 /* MBO Empty */
#define MBIF 0x01 /* MBI Full */
#define INTRMASK 0x8f
/* WRITE */
#define CONTROL(base) STATUS(base)
#define HRST 0x80 /* Hard Reset */
#define SRST 0x40 /* Soft Reset */
#define IRST 0x20 /* Interrupt Reset */
#define SCRST 0x10 /* SCSI Bus Reset */
/* READ/WRITE */
#define DATA(base) (STATUS(base)+1)
#define CMD_NOP 0x00 /* No Operation */
#define CMD_MBINIT 0x01 /* Mailbox Initialization */
#define CMD_START_SCSI 0x02 /* Start SCSI Command */
#define CMD_INQUIRY 0x04 /* Adapter Inquiry */
#define CMD_EMBOI 0x05 /* Enable MailBox Out Interrupt */
#define CMD_BUSON_TIME 0x07 /* Set Bus-On Time */
#define CMD_BUSOFF_TIME 0x08 /* Set Bus-Off Time */
#define CMD_DMASPEED 0x09 /* Set AT Bus Transfer Speed */
#define CMD_RETDEVS 0x0a /* Return Installed Devices */
#define CMD_RETCONF 0x0b /* Return Configuration Data */
#define CMD_RETSETUP 0x0d /* Return Setup Data */
#define CMD_ECHO 0x1f /* ECHO Command Data */
#define CMD_EXTBIOS 0x28 /* Return extend bios information only 1542C */
#define CMD_MBENABLE 0x29 /* Set Mailbox Interface enable only 1542C */
/* Mailbox Definition 5.2.1 and 5.2.2 */
struct mailbox {
unchar status; /* Command/Status */
unchar ccbptr[3]; /* msb, .., lsb */
};
/* This is used with scatter-gather */
struct chain {
unchar datalen[3]; /* Size of this part of chain */
unchar dataptr[3]; /* Location of data */
};
/* These belong in scsi.h also */
static inline void any2scsi(u8 *p, u32 v)
{
p[0] = v >> 16;
p[1] = v >> 8;
p[2] = v;
}
#define scsi2int(up) ( (((long)*(up)) << 16) + (((long)(up)[1]) << 8) + ((long)(up)[2]) )
#define xany2scsi(up, p) \
(up)[0] = ((long)(p)) >> 24; \
(up)[1] = ((long)(p)) >> 16; \
(up)[2] = ((long)(p)) >> 8; \
(up)[3] = ((long)(p));
#define xscsi2int(up) ( (((long)(up)[0]) << 24) + (((long)(up)[1]) << 16) \
+ (((long)(up)[2]) << 8) + ((long)(up)[3]) )
#define MAX_CDB 12
#define MAX_SENSE 14
struct ccb { /* Command Control Block 5.3 */
unchar op; /* Command Control Block Operation Code */
unchar idlun; /* op=0,2:Target Id, op=1:Initiator Id */
/* Outbound data transfer, length is checked*/
/* Inbound data transfer, length is checked */
/* Logical Unit Number */
unchar cdblen; /* SCSI Command Length */
unchar rsalen; /* Request Sense Allocation Length/Disable */
unchar datalen[3]; /* Data Length (msb, .., lsb) */
unchar dataptr[3]; /* Data Pointer */
unchar linkptr[3]; /* Link Pointer */
unchar commlinkid; /* Command Linking Identifier */
unchar hastat; /* Host Adapter Status (HASTAT) */
unchar tarstat; /* Target Device Status */
unchar reserved[2];
unchar cdb[MAX_CDB+MAX_SENSE];/* SCSI Command Descriptor Block */
/* REQUEST SENSE */
};
static int aha1542_detect(struct scsi_host_template *);
static int aha1542_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
static int aha1542_bus_reset(Scsi_Cmnd * SCpnt);
static int aha1542_dev_reset(Scsi_Cmnd * SCpnt);
static int aha1542_host_reset(Scsi_Cmnd * SCpnt);
#if 0
static int aha1542_old_abort(Scsi_Cmnd * SCpnt);
static int aha1542_old_reset(Scsi_Cmnd *, unsigned int);
#endif
static int aha1542_biosparam(struct scsi_device *, struct block_device *,
sector_t, int *);
#define AHA1542_MAILBOXES 8
#define AHA1542_SCATTER 16
#define AHA1542_CMDLUN 1
#endif
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