scsi_asc.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char *sccsid = "@(#)scsi_asc.c	4.11      (ULTRIX)  2/26/91";
#endif lint

extern dumphex();
/************************************************************************
 *									*
 *			Copyright (c) 1989 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any	other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or	reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/************************************************************************
 *
 * scsi_asc.c
 *
 * 3MAX SCSI device driver (ASC routines)		
 *
 * 01/29/91	Robin Miller
 *   o	Setup address/count for various CD-ROM commands which require
 *	data in/data out.
 *   o	Added support for disk send/receive diagnostic functions.
 *
 * 12/05/90	Robin Miller
 *   o	Added support for 10-byte Read/Write CDB's.
 *   o	Use function sz_cdb_length() to obtain the Command Descriptor
 *	Block (CDB) length.
 *
 * 11/27/90     Maria Vella             v00.00.37
 *	Removed two calls to DELAY() in asc_phase_change() which were
 *	there for debugging purposes and should have been removed. 
 *	They caused the loss of 1/10th of a second of time on the
 *	system clock.  Fixes QAR #06476.
 *
 * 10/07/90     Maria Vella             v00.00.36
 *
 *	a.  Major modifications to add PDMA support.
 *	b.  Fixed QAR having to do with setting sz_unit_rcvdiag[] in
 *          ascprobe().  Was being indexed by targid.
 *     
 * 08/30/90	Robin Miller		v00.00.35
 *	Added check in probe routine to recognize RX26 device type
 *	and setup accordingly for floppy device.
 *
 * 08/24/90     Maria Vella             v00.00.34
 *      a.  In asc_state_change(), added check for selection completed
 *          but no command phase asserted by target due to the target
 *          being busy.  Problem shows up when RDAT is attached and
 *          doing its diagnostics while booting.  This must have
 *          fallen through the cracks during the past few modofications.
 *
 * 08/10/90     Maria Vella             v00.00.33
 *     
 *      a.  In asc_state_change(), added check for all 4 states in
 *          which a Request Sense command failed selection due to a
 *          reselection from another device.

 * 07/14/90	mitch mcconnell		v00.00.32
 *	a.  Newest attempt to fix RDAT problem.  When a select failed due
 *	    to being reselected, the code essentially restarted the entire
 *	    command by setting state/event back to begin/cont.  If the 
 *	    command which failed was a RQSNS, the "restart" would cause
 *	    the drive to send the next data record, and the RQSNS info
 *	    was lost.  The fix is to use the pxstate field in the softc
 *	    (as the  Vax code does) to store the state to return to in
 *	    this situation.
 *	b.  Changed retry states to RETRY_CMD and RETRY_SNS. 
 *
 *
 * 07/14/90	mitch mcconnell		v00.00.31
 *	a.  Reset chip values for req/ack offset as soon as they are
 *	    renegotiated. (on hold...)
 *	b.  Removed poll mode for RQSNS.  Now will be handled in state
 *	    machine in scsi.c.  Fix for RDAT reselect timeout problem.
 *
 * 06/06/90	Bill Dallas
 *	In asc_startdma() got rid of hard define of SZ_RQSNS_LEN.
 *	Used scsi command packet for the lenght.
 *
 * 03/14/90	John A. Gallant
 *	Added checks within the data moving code to not go past the true
 *	end of the user's buffer for reads and writes.  Added zero fill
 *	for writes less than a sector size.
 *
 * 03/01/90     Janet Schank
 *      Added retries on busy target in the probe routine.
 *
 * 01/18/90	Mitchell McConnell	v00.00.30
 *  a.	Fixed bug in asc_scsistart for "INTP not set", where printing
 *	SCSI cdb was not incrementing a pointer.  (Only if SZDEBUG on).
 *  b.	Recompiled everything to make sure SZDEBUG off works.
 *
 * 12/22/89	Mitchell McConnell	v00.00.29
 *  a.	Checkpoint version. 
 *  b.	Added more debug tools for rz56 problem.
 *  c.	Re-compile with temporary rz56 "fix" - set req/ack offset to 7.
 *
 * 12/20/89	Mitchell McConnell	v00.00.28
 *  a.	Made the cnf1,2, & 3 registers variables.  Now set cnf3 to
 *	use the 8 byte threshhold for data phase transfers.  
 *  b.	Now set up sync offset and sync per registers even for
 *	Select W/O ATN, since this mode is used for the Request
 *	Sense after a Check Condition.
 *  c.	Fixed bug in asc_busy_target - was hard-coded for a single
 *	controller.
 *
 * 12/14/89	Mitchell McConnell	v00.00.27
 *  o 	Made the sync. xfer per. and req/ack variables which can be
 *	set via xkvar.
 *  o	Removed asc_was_reset as redundant.
 *  o	In asc_reset_disc..., added test for sc_attached after checking
 *	sc_alive.
 *  o	In asc_dumpregs, use the stored version of sr,isr, and ssr 
 *	registers, since re-reading the chip may give misleading results.
 *
 * 12/11/89	Mitchell McConnell	v00.00.26
 *  o	Moved call to asc_reset_discon_io_tasks to asc_reset() as it
 *	is in PMAX.  Because of this, we were not recovering properly
 *	from parity errors.
 *
 * 12/08/89	Mitchell McConnell	v00.00.25
 *  o	Changed parameter for get_sys_ptes from hard-coded 130
 *	to btoc(64k) + 2.          (per Fred Canter).
 *  o	Now use sc_oddbyte as a flag sc_no_disconnects to allow a
 *	particular target to run without disconnecting.
 *
 * 12/06/89	Mitchell McConnell	v00.00.24
 *  o	Statistics were not getting updated because the 53C94 select &
 *	transfer command bypassed asc_sendcmd.  Now collect them in
 *	ascintr (yecchh!) when we know the select & transfer completed
 *	succesfully.
 *
 * 12/01/89	Mitchell McConnell	v00.00.23
 *  o	Another attempt to fix RQSNS problem.  While attempting to select
 *	a target for the RQSNS, we were reselected by a different target.
 *	This made things go quite haywire.  Fix is to not reenable selection
 *	for the 53C94 chip when we get a status of CHECK CONDITION.
 *
 * 11/29/89	Mitchell McConnell	v00.00.22
 *  o	Hack fix for state machine problem with RQSNS - now we will treat
 *	sc_actcmd as a polled command and not return until finished.  See
 *	additional comments in asc_scsistart.
 *
 * 11/08/89	Mitchell McConnell	v00.00.21
 *  o	Checkpoint version.
 *  o   Added ifdef'ed test statements for error logging.
 *
 * 11/03/89	Mitchell McConnell	v00.00.20
 *  o	Merged with ISIS pool.
 *
 * 10/31/89	Mitchell McConnell	v00.00.19
 *  o	a. Add controller to some PRINTD's to debug multiple controllers.
 *  o   Added #defines to compensate for hard-coded references to sii 
 *	in softc, e.g., sc_ascnum is really sc_siinum, (the controller
 *	number).
 *  o	Replaced large amount of asc_probe to be consistent with vax/pmax.
 *	No longer call routine asc_dodev.
 *  o	Added call to get_scsiid for host adapter id.
 *
 * 10/25/89	Mitchell McConnell	v00.00.18
 *  o	a. Fixed bug in asc_data_intr.  Only call restartdma if the
 *	   current phase is still DATAI/DATAO, else asc_phase_change
 *	   will handle it.
 *	b. Adjust asc_dboff_len in asc_data_intr.  It used to be done
 *	   in asc_msgin when SDP was received.
 *	c. Put in print_sense routine as a PRINTD for SCSID_CMD_EXP.
 *
 * 10/23/89	Mitchell McConnell	v00.00.17
 *  o	a. Checkpoint.  Fixed several bugs working on new DMA code.
 *  o	b. Fixed mixup between fstate values (SZ_DATAO_PHA, etc.) and
 *	   SCSI phase (SCS_DATAO).  
 *  o	c. Removed calls to asc_getactive_target.  Made inline code for
 *	   ascintr, elsewhere it is passed as an argument.
 *  o	d. Moved get of savcnt from SDP to MESSI.  By the time we know
 *	   we have SDP, the TC is always zero, since we use DMA for 
 *	   message bytes.
 *  o	e. Moved setting of DMA_DISC flag to SDP message.  PMAX driver 
 *	   makes assumption that DISC will always follow SDP, AND polls
 *	   for it anyway.  Because we handle each message byte individually,
 *	   the test for prevpha == DATAI/DATAO does not work.
 *	   
 * 10/20/89	Mitchell McConnell	v00.00.16
 *  o	a. Fairly radical changes to ascintr DMA handling to more exactly
 *	imitate PMAX SII.
 *  o	b. Make test for phase mismatch (BS || FC) && (PHASE(sr) != fstate).
 *  o	c. Moved data phase handling to new routine asc_data_intr().
 *
 * 10/19/89	Mitchell McConnell	v00.00.15
 *  o   a. Checkpoint.  Flush FIFO fix for 14 (what alliteration!) appears
 *	to have worked.
 *  o	b. In ascintr, try and simultate the SII_MIS (phase mismatch) code.
 *	Instead of BS || FC, now test for BS && (current phase != fstate).
 *
 * 10/17/89	Mitchell McConnell	v00.00.14
 *  o	Checkpoint version.  Both dskx and mtx running simultaneously.
 *  o	Added support to print sense information for debugging.
 *  o	Removed flush fifo at data out phase.
 *
 * 10/17/89	Mitchell McConnell	v00.00.13
 *  o	Added check for !RSEL in state_change.  More printfs to find 
 *	out why reselect is not working.	
 *  o	Removed call to sz_start for reselect case.  Should get restarted
 *	when the reselecting target finishes and disconnects. 
 *  o	Check for scsi_bus_idle in scsistart.  If not idle, return
 *	BUSBUSY.  Removed setting scsi_bus_idle to 0 for BUSY and
 *	command complete cases in ascintr.
 *  o	When reselected, reset the synchronous offset and period registers
 *	for the appropriate values for that target. 
 *  
 * 10/13/89	Mitchell McConnell	v00.00.12
 *  o	Fixed bug that kept disconnect/reconnect from working! 
 *	Initialization sc did not occur because asc_nNASC was equal to
 *	4.  
 *
 * 10/11/89	Mitchell McConnell	v00.00.11
 *  o	Checkpoint version.  Putting printfs in start to find out why
 *	bpcount = 0 when starting DMA.
 *  o	Fixed asc_state_change to recognize reselection during selection.
 *	Must reset state of target which was selecting to Bus Busy so it
 *	will retry later.  Also, must set sc_active to the new target id!
 *
 * 10/09/89	Mitchell McConnell	v00.00.10
 *  o	Fixed bug for synchronous data transfer.  NEVER issue Flush
 *	FIFO when the phase = sync. data in.
 *  o	Fixed bug in ascintr- when checking for state change, used
 *	wrong mnemonic for testing the RESELECT bit in the isr.
 *
 * 10/03/89	Mitchell McConnell	v00.00.09
 *  o	Several misc. bug fixes, esp. invalid use of GETCNTR macro
 *	in asc_ext_messg.
 *  o	Added call to prom_getenv for scsiid of controller.
 *  o 	Began adding support for scsi_logerr (with ifdefs) in
 *	place of mprintf's.  Before release, the mprintfs will
 *	go away, leaving only the error logging. Changed calls
 *	to asc_dumpregs to use 'who' parameter, since scsi_logerr
 *	also calls it.
 *
 * 09/28/89	Mitchell McConnell	v00.00.08
 *  o	Newest attempt at handling extended messages.  Initially,
 *	always DMA one message byte.  If it is an extended message,
 *	set the EXTMESSG flag in szflags.  Issue the MSGACPT
 *	command and return.  If the last command was MSGACPT,
 *	issue a DMA XINFO command to get the length byte.
 *      At the next interrupt, if the EXTMESSG flag is already
 *	set and the last command was DMA XINFO, save the length
 *	byte and issue MSGACPT.  If the last command was MSGACPT,
 *	issue a DMA XINFO for the remaining bytes of the extended
 *	message.  The next interrupt should be FC and (msg in?).
 *	Check the Transfer Count register.  If > 1, copy the
 *	remaining extended message bytes and go process the 
 *	message.  Issue MSGACPT to release ACK.  The next (and
 *	final) interrupt should be BS with phase COMMAND.
 *
 * 09/26/89	Mitchell McConnell	v00.00.07
 *  o	Control version - first built under new "isis-sys" pool.
 *  o   Fixed bug in ascintr - used ASC_XINFO instead of 
 *	(ASC_DMA | ASC_XINFO).
 *
 * 09/21/89	Mitchell McConnell	v00.00.06
 *
 *  o	First version to support reads and writes.  Attempt to keep
 *	some rudimentary form of version control until placed under
 *	SCCS.
 *
 *  o	Removed the 'attn' flag from asc_senddata, since it was not
 *	being used, and anyway, the ASC will assert ATN when sending
 *	bytes to the target during message out phase.
 *
 *  0	Give some more intelligence to asc_select_target to know 
 *	whether to issue the SELECT with or without ATN.  For now,
 *	just use the asc_sentsync (sp?) as a flag.  This assumes that
 *	the ONLY time we will need to do this is after a reset to
 *	(re)set the synchronous parameters.
 *   
 *  o	Try using DMA to send command
 ***********************************************************************/

#define SZDEBUG

char  asc_version[] = "ASC Version 00.00.32b";

#define ASC_LOGERR	1      
#define ASC_TEST_LOG	1
#define ASCDEBUG	1 

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

/* WARNING! If the softc EVER changes, these defines need to be re-examined.*/

#define	sc_ascnum		sc_siinum
#define sc_ascsentsync		sc_siisentsync
#define sc_ascdmacount		sc_siidmacount
#define sc_ascreqack		sc_siireqack
#define sc_ascdboff		sc_siidboff
#define enable_sel_rsel 	use_programmed_io 
#define sc_no_disconnects 	sc_oddbyte

#include "../data/scsi_data.c"
#include "scsi_debug.h"
#include "../../tc/tc.h"
#include "pdma3min.h"

#define MAXASC nNASC

extern char szbufmap[];
extern int scsidebug;
extern short sz_timetable[];
extern int cpu;

int asc_wait_after_inquiry = 1000;

int asc_sync_xfer_per = ASC_SYNC_XFER_PER;
int asc_sync_xfer_reg = ASC_SYNC_XFER_REG;
char asc_def_cnf1 = ASC_C1_PARITY;
char asc_def_cnf2 = 0;
char asc_def_cnf3 = 0; 

/*
 * Autoconfiguration information
 */
extern  u_short szstd[];
int     szslave(), szattach(), sz_start(), szerror(), ascprobe();
struct	uba_driver ascdriver = { ascprobe, szslave, szattach, sz_start,
				 szstd, "rz", szdinfo, "asc", szminfo,
				 0 };

int asc_busy_target();			/* for forward reference */

short asc_wait_count = ASC_WAIT_COUNT;	/* Delay count for ASC chip */
short asc_reject_message = 0;		/* Message Reject Flag      */
short asc_assert_attn = 0;		/* Assert Attention Flag    */
short asc_nNASC = NASC;			/* Number of ASC controllers*/
short asc_firstcall = 1;		/* First call to probe flag */

#if ASC_TEST_LOG
short	asc_tested_log = 1;
#endif ASC_TEST_LOG

/*
 * Number of seconds to wait for SCSI devices
 * to come ready enough to respond to inquiry
 * after bus reset. Needs to be a variable so
 * users can change it (I am such a nice guy).
 * Factory default is 7 seconds (in scsi_data.c).
 */

extern int sz_wait_for_devices;
extern int sz_max_wait_for_devices;

extern int asc_scsistart();
extern int asc_reset();
extern int tc_addr_to_name();

extern struct scsi_devtab szp_rz_udt;
extern struct scsi_devtab szp_tz_udt;
extern struct scsi_devtab szp_cz_udt;
extern int szp_nrz;
extern int szp_ntz;
extern int szp_ncz;
extern int szp_nrx;
extern int rz_max_xfer;
extern int cz_max_xfer;
extern int tz_max_xfer;
extern int rzcomplete();
extern int tzcomplete();

/******************************************************************
 *
 * Name:	ascprobe
 *
 * Abstract:	Probe for any SCSI devices on this controller.
 *		Initialize any fields in the softc structure.  For
 *		each possible target:
 *	    	    o	build SCSI Inquiry command
 *		    o	call asc_scsistart()
 *		    o	if command successful,
 *			    initialize target-specific data structures
 *			    allocate PTEs for buffer mapping
 *			    call szattach()
 *			    set up buffer for non-DMA commands
 *
 *		Clear any pending interrupts for this controller.
 *
 * Inputs:
 *
 * 	cntrl	- the controller number for this bus.
 *
 * Outputs:	None.
 *
 * Return values: None.
 *
 ******************************************************************/

/* rpbfix: fake out the config process */
extern int cpu;

ascprobe(vbaddr, um) 
volatile char *vbaddr;		/* base address for this option slot */
register struct uba_ctlr *um;
{
	ASC_REG *ascaddr;	/* pointer for the ASC registers */
	int targid, unit;
	int dboff;
	int rz_slotsize, tz_slotsize, cz_slotsize;
	int i, s, stat;
	struct sz_inq_dt *idp;
	struct sz_rdcap_dt *rdp;
	struct scsi_devtab *sdp;
	struct scsi_devtab *usdp;
	int sdp_match;
	char *p;
	char *env;
	int alive;
	int retries, status;
	int cntlr = um->um_ctlr;
	register struct sz_softc *sc = &sz_softc[cntlr];
        char modname[TC_ROMNAMLEN+1];
        int opt_type=0;

	s = splbio();

	alive = 1; 		/* On 3MAX asc is always present */
        sc->ioasicp = 0;

	if ((cpu == DS_5000_100) && (cntlr == 0))  
            {
            sc->ioasicp =  (char *) PHYS_TO_K1( BASE_IOASIC );
            }

	/*
	 * Initialize certain fields in the softc structure
	 * and reset the ASC chip.
	 */

	if (alive) {
	    sc->sc_ascnum = cntlr;		/* save a pointer to the asc */
	    sc->sc_slotvaddr = vbaddr;		/* init the base address */
	    sc->sc_sysid = get_scsiid(um->um_ctlr);