aha152x.c

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/* aha152x.c -- Adaptec AHA-152x driver
 * Author: J黵gen E. Fischer, [e-mail]
 * Copyright 1993-1999 J黵gen E. Fischer
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 *
 * $Id: aha152x.c,v 2.3 2000/11/04 16:40:26 fischer Exp $
 *
 * $Log: aha152x.c,v $
 * Revision 2.3  2000/11/04 16:40:26  fischer
 * - handle data overruns
 * - extend timeout for data phases
 *
 * Revision 2.2  2000/08/08 19:54:53  fischer
 * - minor changes
 *
 * Revision 2.1  2000/05/17 16:23:17  fischer
 * - signature update
 * - fix for data out w/o scatter gather
 *
 * Revision 2.0  1999/12/25 15:07:32  fischer
 * - interrupt routine completly reworked
 * - basic support for new eh code
 *
 * Revision 1.21  1999/11/10 23:46:36  fischer
 * - default to synchronous operation
 * - synchronous negotiation fixed
 * - added timeout to loops
 * - debugging output can be controlled through procfs
 *
 * Revision 1.20  1999/11/07 18:37:31  fischer
 * - synchronous operation works
 * - resid support for sg driver
 *
 * Revision 1.19  1999/11/02 22:39:59  fischer
 * - moved leading comments to README.aha152x
 * - new additional module parameters
 * - updates for 2.3
 * - support for the Tripace TC1550 controller
 * - interrupt handling changed
 *
 * Revision 1.18  1996/09/07 20:10:40  fischer
 * - fixed can_queue handling (multiple outstanding commands working again)
 *
 * Revision 1.17  1996/08/17 16:05:14  fischer
 * - biosparam improved
 * - interrupt verification
 * - updated documentation
 * - cleanups
 *
 * Revision 1.16  1996/06/09 00:04:56  root
 * - added configuration symbols for insmod (aha152x/aha152x1)
 *
 * Revision 1.15  1996/04/30 14:52:06  fischer
 * - proc info fixed
 * - support for extended translation for >1GB disks
 *
 * Revision 1.14  1996/01/17  15:11:20  fischer
 * - fixed lockup in MESSAGE IN phase after reconnection
 *
 * Revision 1.13  1996/01/09  02:15:53  fischer
 * - some cleanups
 * - moved request_irq behind controller initialization
 *   (to avoid spurious interrupts)
 *
 * Revision 1.12  1995/12/16  12:26:07  fischer
 * - barrier()s added
 * - configurable RESET delay added
 *
 * Revision 1.11  1995/12/06  21:18:35  fischer
 * - some minor updates
 *
 * Revision 1.10  1995/07/22  19:18:45  fischer
 * - support for 2 controllers
 * - started synchronous data transfers (not working yet)
 *
 * Revision 1.9  1995/03/18  09:20:24  root
 * - patches for PCMCIA and modules
 *
 * Revision 1.8  1995/01/21  22:07:19  root
 * - snarf_region => request_region
 * - aha152x_intr interface change
 *
 * Revision 1.7  1995/01/02  23:19:36  root
 * - updated COMMAND_SIZE to cmd_len
 * - changed sti() to restore_flags()
 * - fixed some #ifdef which generated warnings
 *
 * Revision 1.6  1994/11/24  20:35:27  root
 * - problem with odd number of bytes in fifo fixed
 *
 * Revision 1.5  1994/10/30  14:39:56  root
 * - abort code fixed
 * - debugging improved
 *
 * Revision 1.4  1994/09/12  11:33:01  root
 * - irqaction to request_irq
 * - abortion updated
 *
 * Revision 1.3  1994/08/04  13:53:05  root
 * - updates for mid-level-driver changes
 * - accept unexpected BUSFREE phase as error condition
 * - parity check now configurable
 *
 * Revision 1.2  1994/07/03  12:56:36  root
 * - cleaned up debugging code
 * - more tweaking on reset delays
 * - updated abort/reset code (pretty untested...)
 *
 * Revision 1.1  1994/05/28  21:18:49  root
 * - update for mid-level interface change (abort-reset)
 * - delays after resets adjusted for some slow devices
 *
 * Revision 1.0  1994/03/25  12:52:00  root
 * - Fixed "more data than expected" problem
 * - added new BIOS signatures
 *
 * Revision 0.102  1994/01/31  20:44:12  root
 * - minor changes in insw/outsw handling
 *
 * Revision 0.101  1993/12/13  01:16:27  root
 * - fixed STATUS phase (non-GOOD stati were dropped sometimes;
 *   fixes problems with CD-ROM sector size detection & media change)
 *
 * Revision 0.100  1993/12/10  16:58:47  root
 * - fix for unsuccessful selections in case of non-continuous id assignments
 *   on the scsi bus.
 *
 * Revision 0.99  1993/10/24  16:19:59  root
 * - fixed DATA IN (rare read errors gone)
 *
 * Revision 0.98  1993/10/17  12:54:44  root
 * - fixed some recent fixes (shame on me)
 * - moved initialization of scratch area to aha152x_queue
 *
 * Revision 0.97  1993/10/09  18:53:53  root
 * - DATA IN fixed. Rarely left data in the fifo.
 *
 * Revision 0.96  1993/10/03  00:53:59  root
 * - minor changes on DATA IN
 *
 * Revision 0.95  1993/09/24  10:36:01  root
 * - change handling of MSGI after reselection
 * - fixed sti/cli
 * - minor changes
 *
 * Revision 0.94  1993/09/18  14:08:22  root
 * - fixed bug in multiple outstanding command code
 * - changed detection
 * - support for kernel command line configuration
 * - reset corrected
 * - changed message handling
 *
 * Revision 0.93  1993/09/15  20:41:19  root
 * - fixed bugs with multiple outstanding commands
 *
 * Revision 0.92  1993/09/13  02:46:33  root
 * - multiple outstanding commands work (no problems with IBM drive)
 *
 * Revision 0.91  1993/09/12  20:51:46  root
 * added multiple outstanding commands
 * (some problem with this $%&? IBM device remain)
 *
 * Revision 0.9  1993/09/12  11:11:22  root
 * - corrected auto-configuration
 * - changed the auto-configuration (added some '#define's)
 * - added support for dis-/reconnection
 *
 * Revision 0.8  1993/09/06  23:09:39  root
 * - added support for the drive activity light
 * - minor changes
 *
 * Revision 0.7  1993/09/05  14:30:15  root
 * - improved phase detection
 * - now using the new snarf_region code of 0.99pl13
 *
 * Revision 0.6  1993/09/02  11:01:38  root
 * first public release; added some signatures and biosparam()
 *
 * Revision 0.5  1993/08/30  10:23:30  root
 * fixed timing problems with my IBM drive
 *
 * Revision 0.4  1993/08/29  14:06:52  root
 * fixed some problems with timeouts due incomplete commands
 *
 * Revision 0.3  1993/08/28  15:55:03  root
 * writing data works too.  mounted and worked on a dos partition
 *
 * Revision 0.2  1993/08/27  22:42:07  root
 * reading data works.  Mounted a msdos partition.
 *
 * Revision 0.1  1993/08/25  13:38:30  root
 * first "damn thing doesn't work" version
 *
 * Revision 0.0  1993/08/14  19:54:25  root
 * empty function bodies; detect() works.
 *
 *
 **************************************************************************
 
 see README.aha152x for configuration details

 **************************************************************************/

#include <linux/module.h>

#if defined(PCMCIA)
#undef MODULE
#endif

#include <linux/sched.h>
#include <asm/io.h>
#include <linux/blk.h>
#include "scsi.h"
#include "sd.h"
#include "hosts.h"
#include "constants.h"
#include <asm/system.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <asm/semaphore.h>
#include <linux/spinlock.h>

#include "aha152x.h"
#include <linux/stat.h>

#include <scsi/scsicam.h>

/* DEFINES */

/* For PCMCIA cards, always use AUTOCONF */
#if defined(PCMCIA) || defined(MODULE)
#if !defined(AUTOCONF)
#define AUTOCONF
#endif
#endif

#if !defined(AUTOCONF) && !defined(SETUP0)
#error define AUTOCONF or SETUP0
#endif

#if defined(AHA152X_DEBUG)
#define DEBUG_DEFAULT debug_eh

#define DPRINTK(when,msgs...) \
	do { if(HOSTDATA(shpnt)->debug & (when)) printk(msgs); } while(0)

#define DO_LOCK(flags)	\
	do { \
		if(spin_is_locked(&QLOCK)) { \
			DPRINTK(debug_intr, DEBUG_LEAD "(%s:%d) already locked at %s:%d\n", CMDINFO(CURRENT_SC), __FUNCTION__, __LINE__, QLOCKER, QLOCKERL); \
		} \
		DPRINTK(debug_locks, DEBUG_LEAD "(%s:%d) locking\n", CMDINFO(CURRENT_SC), __FUNCTION__, __LINE__); \
		spin_lock_irqsave(&QLOCK,flags); \
		DPRINTK(debug_locks, DEBUG_LEAD "(%s:%d) locked\n", CMDINFO(CURRENT_SC), __FUNCTION__, __LINE__); \
		QLOCKER=__FUNCTION__; \
		QLOCKERL=__LINE__; \
	} while(0)

#define DO_UNLOCK(flags)	\
	do { \
		DPRINTK(debug_locks, DEBUG_LEAD "(%s:%d) unlocking (locked at %s:%d)\n", CMDINFO(CURRENT_SC), __FUNCTION__, __LINE__, QLOCKER, QLOCKERL); \
		spin_unlock_irqrestore(&QLOCK,flags); \
		DPRINTK(debug_locks, DEBUG_LEAD "(%s:%d) unlocked\n", CMDINFO(CURRENT_SC), __FUNCTION__, __LINE__); \
		QLOCKER="(not locked)"; \
		QLOCKERL=0; \
	} while(0)

#else
#define DPRINTK(when,msgs...)
#define	DO_LOCK(flags)		spin_lock_irqsave(&QLOCK,flags)
#define	DO_UNLOCK(flags)	spin_unlock_irqrestore(&QLOCK,flags)
#endif

#define LEAD		"(scsi%d:%d:%d) "
#define WARN_LEAD	KERN_WARNING	LEAD
#define INFO_LEAD	KERN_INFO	LEAD
#define NOTE_LEAD	KERN_NOTICE	LEAD
#define ERR_LEAD	KERN_ERR	LEAD
#define DEBUG_LEAD	KERN_DEBUG	LEAD
#define CMDINFO(cmd) \
			(cmd) ? ((cmd)->host->host_no) : -1, \
                        (cmd) ? ((cmd)->target & 0x0f) : -1, \
			(cmd) ? ((cmd)->lun & 0x07) : -1

#define DELAY_DEFAULT 100

/* possible irq range */
#if defined(PCMCIA)
#define IRQ_MIN 0
#define IRQ_MAX 16
#else
#define IRQ_MIN 9
#define IRQ_MAX 12
#endif
#define IRQS    IRQ_MAX-IRQ_MIN+1

enum {
	not_issued	= 0x0001,	/* command not yet issued */
	selecting	= 0x0002, 	/* target is beeing selected */
	identified	= 0x0004,	/* IDENTIFY was sent */
	disconnected	= 0x0008,	/* target disconnected */
	completed	= 0x0010,	/* target sent COMMAND COMPLETE */ 
	aborted		= 0x0020,	/* ABORT was sent */
	resetted	= 0x0040,	/* BUS DEVICE RESET was sent */
	spiordy		= 0x0080,	/* waiting for SPIORDY to raise */
	syncneg		= 0x0100,	/* synchronous negotiation in progress */
	aborting	= 0x0200,	/* ABORT is pending */
	resetting	= 0x0400,	/* BUS DEVICE RESET is pending */
};

#if defined(MODULE)
MODULE_AUTHOR("J黵gen Fischer");
MODULE_DESCRIPTION(AHA152X_REVID);
MODULE_PARM(io, "1-2i");
MODULE_PARM_DESC(io,"base io address of controller");
static int io[] = {0, 0};

MODULE_PARM(irq, "1-2i");
MODULE_PARM_DESC(irq,"interrupt for controller");
static int irq[] = {0, 0};

MODULE_PARM(scsiid, "1-2i");
MODULE_PARM_DESC(scsiid,"scsi id of controller");
static int scsiid[] = {7, 7};

MODULE_PARM(reconnect, "1-2i");
MODULE_PARM_DESC(reconnect,"allow targets to disconnect");
static int reconnect[] = {1, 1};

MODULE_PARM(parity, "1-2i");
MODULE_PARM_DESC(parity,"use scsi parity");
static int parity[] = {1, 1};

MODULE_PARM(sync, "1-2i");
MODULE_PARM_DESC(sync,"use synchronous transfers");
static int sync[] = {1, 1};

MODULE_PARM(delay, "1-2i");
MODULE_PARM_DESC(delay,"scsi reset delay");
static int delay[] = {DELAY_DEFAULT, DELAY_DEFAULT};

MODULE_PARM(exttrans, "1-2i");
MODULE_PARM_DESC(exttrans,"use extended translation");
static int exttrans[] = {0, 0};

#if !defined(AHA152X_DEBUG)
MODULE_PARM(aha152x, "1-8i");
MODULE_PARM_DESC(aha152x, "parameters for first controller");
static int aha152x[] = {0, 11, 7, 1, 1, 0, DELAY_DEFAULT, 0};

MODULE_PARM(aha152x1, "1-8i");
MODULE_PARM_DESC(aha152x1, "parameters for second controller");
static int aha152x1[] = {0, 11, 7, 1, 1, 0, DELAY_DEFAULT, 0};
#else
MODULE_PARM(debug, "1-2i");
MODULE_PARM_DESC(debug, "flags for driver debugging");
static int debug[] = {DEBUG_DEFAULT, DEBUG_DEFAULT};

MODULE_PARM(aha152x, "1-9i");
MODULE_PARM_DESC(aha152x, "parameters for first controller");
static int aha152x[]   = {0, 11, 7, 1, 1, 1, DELAY_DEFAULT, 0, DEBUG_DEFAULT};

MODULE_PARM(aha152x1, "1-9i");
MODULE_PARM_DESC(aha152x1, "parameters for second controller");
static int aha152x1[]  = {0, 11, 7, 1, 1, 1, DELAY_DEFAULT, 0, DEBUG_DEFAULT};
#endif /* !defined(AHA152X_DEBUG) */
#endif /* MODULE */

/* set by aha152x_setup according to the command line */
static int setup_count = 0;
static int registered_count = 0;
static struct aha152x_setup {
	int io_port;
	int irq;
	int scsiid;
	int reconnect;
	int parity;
	int synchronous;
	int delay;
	int ext_trans;
	int tc1550;
#if defined(AHA152X_DEBUG)
	int debug;
#endif
	char *conf;
} setup[2];

static struct Scsi_Host *aha152x_host[IRQS];

/*
 * internal states of the host
 *
 */ 
enum aha152x_state {
	idle=0,
	unknown,
	seldo,
	seldi,
	selto,
	busfree,
	msgo,
	cmd,
	msgi,
	status,
	datai,
	datao,
	parerr,
	rsti,
	maxstate
};

/*
 * current state information of the host
 *
 */
struct aha152x_hostdata {
	Scsi_Cmnd *issue_SC;
		/* pending commands to issue */

	Scsi_Cmnd *current_SC;
		/* current command on the bus */

	Scsi_Cmnd *disconnected_SC;
		/* commands that disconnected */

	Scsi_Cmnd *done_SC;
		/* command that was completed */

	spinlock_t lock;
		/* host lock */

#if defined(AHA152X_DEBUG)
	char *locker;	/* which function has the lock */
	int lockerl;	/* where did it get it */

	int debug;	/* current debugging setting */
#endif

#if defined(AHA152X_STAT)
	int           total_commands;
	int	      disconnections;
	int	      busfree_without_any_action;
	int	      busfree_without_old_command;
	int	      busfree_without_new_command;
	int	      busfree_without_done_command;
	int	      busfree_with_check_condition;
	int           count[maxstate];
	int           count_trans[maxstate];
	unsigned long time[maxstate];
#endif

	int commands;		/* current number of commands */

	int reconnect;		/* disconnection allowed */
	int parity;		/* parity checking enabled */
	int synchronous;	/* synchronous transferes enabled */
	int delay;		/* reset out delay */
	int ext_trans;		/* extended translation enabled */

	int swint; 		/* software-interrupt was fired during detect() */
	int service;		/* bh needs to be run */
	int in_intr;		/* bh is running */

	/* current state,
	   previous state,
	   last state different from current state */
	enum aha152x_state state, prevstate, laststate;

	int target;
		/* reconnecting target */

	unsigned char syncrate[8];
		/* current synchronous transfer agreements */

	unsigned char syncneg[8];
		/* 0: no negotiation;
		 * 1: negotiation in progress;
		 * 2: negotiation completed
		 */

	int cmd_i;
		/* number of sent bytes of current command */

	int msgi_len;
		/* number of received message bytes */