2840 lines
91 KiB
C
2840 lines
91 KiB
C
/*
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* NCR 5380 generic driver routines. These should make it *trivial*
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* to implement 5380 SCSI drivers under Linux with a non-trantor
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* architecture.
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*
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* Note that these routines also work with NR53c400 family chips.
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*
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* Copyright 1993, Drew Eckhardt
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* Visionary Computing
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* (Unix and Linux consulting and custom programming)
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* drew@colorado.edu
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* +1 (303) 666-5836
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*
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* DISTRIBUTION RELEASE 6.
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*
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* For more information, please consult
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*
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* NCR 5380 Family
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* SCSI Protocol Controller
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* Databook
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*
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* NCR Microelectronics
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* 1635 Aeroplaza Drive
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* Colorado Springs, CO 80916
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* 1+ (719) 578-3400
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* 1+ (800) 334-5454
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*/
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/*
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* $Log: NCR5380.c,v $
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* Revision 1.10 1998/9/2 Alan Cox
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* (alan@lxorguk.ukuu.org.uk)
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* Fixed up the timer lockups reported so far. Things still suck. Looking
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* forward to 2.3 and per device request queues. Then it'll be possible to
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* SMP thread this beast and improve life no end.
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* Revision 1.9 1997/7/27 Ronald van Cuijlenborg
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* (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl)
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* (hopefully) fixed and enhanced USLEEP
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* added support for DTC3181E card (for Mustek scanner)
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*
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* Revision 1.8 Ingmar Baumgart
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* (ingmar@gonzo.schwaben.de)
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* added support for NCR53C400a card
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*
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* Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
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* added proc_info
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* added support needed for DTC 3180/3280
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* fixed a couple of bugs
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*
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* Revision 1.5 1994/01/19 09:14:57 drew
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* Fixed udelay() hack that was being used on DATAOUT phases
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* instead of a proper wait for the final handshake.
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*
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* Revision 1.4 1994/01/19 06:44:25 drew
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* *** empty log message ***
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*
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* Revision 1.3 1994/01/19 05:24:40 drew
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* Added support for TCR LAST_BYTE_SENT bit.
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*
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* Revision 1.2 1994/01/15 06:14:11 drew
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* REAL DMA support, bug fixes.
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*
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* Revision 1.1 1994/01/15 06:00:54 drew
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* Initial revision
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*
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*/
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/*
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* Further development / testing that should be done :
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* 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
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* code so that everything does the same thing that's done at the
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* end of a pseudo-DMA read operation.
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*
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* 2. Fix REAL_DMA (interrupt driven, polled works fine) -
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* basically, transfer size needs to be reduced by one
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* and the last byte read as is done with PSEUDO_DMA.
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*
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* 4. Test SCSI-II tagged queueing (I have no devices which support
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* tagged queueing)
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*
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* 5. Test linked command handling code after Eric is ready with
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* the high level code.
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*/
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_transport_spi.h>
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#ifndef NDEBUG
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#define NDEBUG 0
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#endif
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#ifndef NDEBUG_ABORT
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#define NDEBUG_ABORT 0
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#endif
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#if (NDEBUG & NDEBUG_LISTS)
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#define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
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#define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); }
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#else
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#define LIST(x,y)
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#define REMOVE(w,x,y,z)
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#endif
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#ifndef notyet
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#undef LINKED
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#undef REAL_DMA
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#endif
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#ifdef REAL_DMA_POLL
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#undef READ_OVERRUNS
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#define READ_OVERRUNS
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#endif
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#ifdef BOARD_REQUIRES_NO_DELAY
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#define io_recovery_delay(x)
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#else
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#define io_recovery_delay(x) udelay(x)
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#endif
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/*
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* Design
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*
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* This is a generic 5380 driver. To use it on a different platform,
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* one simply writes appropriate system specific macros (ie, data
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* transfer - some PC's will use the I/O bus, 68K's must use
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* memory mapped) and drops this file in their 'C' wrapper.
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*
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* (Note from hch: unfortunately it was not enough for the different
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* m68k folks and instead of improving this driver they copied it
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* and hacked it up for their needs. As a consequence they lost
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* most updates to this driver. Maybe someone will fix all these
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* drivers to use a common core one day..)
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*
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* As far as command queueing, two queues are maintained for
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* each 5380 in the system - commands that haven't been issued yet,
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* and commands that are currently executing. This means that an
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* unlimited number of commands may be queued, letting
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* more commands propagate from the higher driver levels giving higher
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* throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
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* allowing multiple commands to propagate all the way to a SCSI-II device
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* while a command is already executing.
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*
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*
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* Issues specific to the NCR5380 :
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*
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* When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
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* piece of hardware that requires you to sit in a loop polling for
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* the REQ signal as long as you are connected. Some devices are
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* brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
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* while doing long seek operations.
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*
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* The workaround for this is to keep track of devices that have
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* disconnected. If the device hasn't disconnected, for commands that
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* should disconnect, we do something like
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*
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* while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
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*
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* Some tweaking of N and M needs to be done. An algorithm based
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* on "time to data" would give the best results as long as short time
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* to datas (ie, on the same track) were considered, however these
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* broken devices are the exception rather than the rule and I'd rather
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* spend my time optimizing for the normal case.
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*
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* Architecture :
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*
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* At the heart of the design is a coroutine, NCR5380_main,
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* which is started from a workqueue for each NCR5380 host in the
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* system. It attempts to establish I_T_L or I_T_L_Q nexuses by
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* removing the commands from the issue queue and calling
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* NCR5380_select() if a nexus is not established.
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*
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* Once a nexus is established, the NCR5380_information_transfer()
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* phase goes through the various phases as instructed by the target.
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* if the target goes into MSG IN and sends a DISCONNECT message,
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* the command structure is placed into the per instance disconnected
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* queue, and NCR5380_main tries to find more work. If the target is
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* idle for too long, the system will try to sleep.
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*
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* If a command has disconnected, eventually an interrupt will trigger,
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* calling NCR5380_intr() which will in turn call NCR5380_reselect
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* to reestablish a nexus. This will run main if necessary.
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*
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* On command termination, the done function will be called as
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* appropriate.
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*
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* SCSI pointers are maintained in the SCp field of SCSI command
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* structures, being initialized after the command is connected
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* in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
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* Note that in violation of the standard, an implicit SAVE POINTERS operation
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* is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
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*/
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/*
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* Using this file :
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* This file a skeleton Linux SCSI driver for the NCR 5380 series
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* of chips. To use it, you write an architecture specific functions
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* and macros and include this file in your driver.
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*
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* These macros control options :
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* AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
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* defined.
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*
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* AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
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* for commands that return with a CHECK CONDITION status.
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*
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* DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
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* transceivers.
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*
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* DONT_USE_INTR - if defined, never use interrupts, even if we probe or
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* override-configure an IRQ.
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*
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* LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
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* bytes at a time. Since interrupts are disabled by default during
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* these transfers, we might need this to give reasonable interrupt
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* service time if the transfer size gets too large.
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*
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* LINKED - if defined, linked commands are supported.
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*
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* PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
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*
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* REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
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*
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* REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
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* rely on phase mismatch and EOP interrupts to determine end
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* of phase.
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*
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* UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
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* only really want to use this if you're having a problem with
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* dropped characters during high speed communications, and even
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* then, you're going to be better off twiddling with transfersize
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* in the high level code.
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*
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* Defaults for these will be provided although the user may want to adjust
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* these to allocate CPU resources to the SCSI driver or "real" code.
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*
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* USLEEP_SLEEP - amount of time, in jiffies, to sleep
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*
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* USLEEP_POLL - amount of time, in jiffies, to poll
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*
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* These macros MUST be defined :
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* NCR5380_local_declare() - declare any local variables needed for your
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* transfer routines.
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*
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* NCR5380_setup(instance) - initialize any local variables needed from a given
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* instance of the host adapter for NCR5380_{read,write,pread,pwrite}
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*
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* NCR5380_read(register) - read from the specified register
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*
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* NCR5380_write(register, value) - write to the specific register
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*
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* NCR5380_implementation_fields - additional fields needed for this
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* specific implementation of the NCR5380
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*
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* Either real DMA *or* pseudo DMA may be implemented
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* REAL functions :
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* NCR5380_REAL_DMA should be defined if real DMA is to be used.
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* Note that the DMA setup functions should return the number of bytes
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* that they were able to program the controller for.
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*
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* Also note that generic i386/PC versions of these macros are
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* available as NCR5380_i386_dma_write_setup,
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* NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
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*
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* NCR5380_dma_write_setup(instance, src, count) - initialize
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* NCR5380_dma_read_setup(instance, dst, count) - initialize
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* NCR5380_dma_residual(instance); - residual count
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*
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* PSEUDO functions :
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* NCR5380_pwrite(instance, src, count)
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* NCR5380_pread(instance, dst, count);
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*
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* The generic driver is initialized by calling NCR5380_init(instance),
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* after setting the appropriate host specific fields and ID. If the
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* driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
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* possible) function may be used.
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*/
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static int do_abort(struct Scsi_Host *host);
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static void do_reset(struct Scsi_Host *host);
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/*
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* initialize_SCp - init the scsi pointer field
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* @cmd: command block to set up
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*
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* Set up the internal fields in the SCSI command.
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*/
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static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
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{
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/*
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* Initialize the Scsi Pointer field so that all of the commands in the
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* various queues are valid.
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*/
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if (scsi_bufflen(cmd)) {
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cmd->SCp.buffer = scsi_sglist(cmd);
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cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
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cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
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cmd->SCp.this_residual = cmd->SCp.buffer->length;
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} else {
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cmd->SCp.buffer = NULL;
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cmd->SCp.buffers_residual = 0;
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cmd->SCp.ptr = NULL;
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cmd->SCp.this_residual = 0;
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}
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}
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/**
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* NCR5380_poll_politely - wait for NCR5380 status bits
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* @instance: controller to poll
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* @reg: 5380 register to poll
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* @bit: Bitmask to check
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* @val: Value required to exit
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*
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* Polls the NCR5380 in a reasonably efficient manner waiting for
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* an event to occur, after a short quick poll we begin giving the
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* CPU back in non IRQ contexts
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*
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* Returns the value of the register or a negative error code.
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*/
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static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
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{
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NCR5380_local_declare();
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int n = 500; /* At about 8uS a cycle for the cpu access */
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unsigned long end = jiffies + t;
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int r;
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NCR5380_setup(instance);
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while( n-- > 0)
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{
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r = NCR5380_read(reg);
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if((r & bit) == val)
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return 0;
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cpu_relax();
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}
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/* t time yet ? */
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while(time_before(jiffies, end))
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{
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r = NCR5380_read(reg);
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if((r & bit) == val)
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return 0;
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if(!in_interrupt())
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cond_resched();
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else
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cpu_relax();
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}
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return -ETIMEDOUT;
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}
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static struct {
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unsigned char value;
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const char *name;
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} phases[] __maybe_unused = {
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{PHASE_DATAOUT, "DATAOUT"},
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{PHASE_DATAIN, "DATAIN"},
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{PHASE_CMDOUT, "CMDOUT"},
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{PHASE_STATIN, "STATIN"},
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{PHASE_MSGOUT, "MSGOUT"},
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{PHASE_MSGIN, "MSGIN"},
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{PHASE_UNKNOWN, "UNKNOWN"}
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};
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#if NDEBUG
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static struct {
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unsigned char mask;
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const char *name;
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} signals[] = {
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{SR_DBP, "PARITY"},
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{SR_RST, "RST"},
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{SR_BSY, "BSY"},
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{SR_REQ, "REQ"},
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{SR_MSG, "MSG"},
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{SR_CD, "CD"},
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{SR_IO, "IO"},
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{SR_SEL, "SEL"},
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{0, NULL}
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},
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basrs[] = {
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{BASR_ATN, "ATN"},
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{BASR_ACK, "ACK"},
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{0, NULL}
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},
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icrs[] = {
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{ICR_ASSERT_RST, "ASSERT RST"},
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{ICR_ASSERT_ACK, "ASSERT ACK"},
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{ICR_ASSERT_BSY, "ASSERT BSY"},
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{ICR_ASSERT_SEL, "ASSERT SEL"},
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{ICR_ASSERT_ATN, "ASSERT ATN"},
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{ICR_ASSERT_DATA, "ASSERT DATA"},
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{0, NULL}
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},
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mrs[] = {
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{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
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{MR_TARGET, "MODE TARGET"},
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{MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
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{MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
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{MR_MONITOR_BSY, "MODE MONITOR BSY"},
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{MR_DMA_MODE, "MODE DMA"},
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{MR_ARBITRATE, "MODE ARBITRATION"},
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{0, NULL}
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};
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/**
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* NCR5380_print - print scsi bus signals
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* @instance: adapter state to dump
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*
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* Print the SCSI bus signals for debugging purposes
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*
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* Locks: caller holds hostdata lock (not essential)
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*/
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static void NCR5380_print(struct Scsi_Host *instance)
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{
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NCR5380_local_declare();
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unsigned char status, data, basr, mr, icr, i;
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NCR5380_setup(instance);
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data = NCR5380_read(CURRENT_SCSI_DATA_REG);
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status = NCR5380_read(STATUS_REG);
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mr = NCR5380_read(MODE_REG);
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icr = NCR5380_read(INITIATOR_COMMAND_REG);
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basr = NCR5380_read(BUS_AND_STATUS_REG);
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printk("STATUS_REG: %02x ", status);
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for (i = 0; signals[i].mask; ++i)
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if (status & signals[i].mask)
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printk(",%s", signals[i].name);
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printk("\nBASR: %02x ", basr);
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for (i = 0; basrs[i].mask; ++i)
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if (basr & basrs[i].mask)
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printk(",%s", basrs[i].name);
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printk("\nICR: %02x ", icr);
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for (i = 0; icrs[i].mask; ++i)
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if (icr & icrs[i].mask)
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printk(",%s", icrs[i].name);
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printk("\nMODE: %02x ", mr);
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for (i = 0; mrs[i].mask; ++i)
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if (mr & mrs[i].mask)
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printk(",%s", mrs[i].name);
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printk("\n");
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}
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|
|
|
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/*
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* NCR5380_print_phase - show SCSI phase
|
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* @instance: adapter to dump
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*
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* Print the current SCSI phase for debugging purposes
|
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*
|
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* Locks: none
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*/
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|
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static void NCR5380_print_phase(struct Scsi_Host *instance)
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{
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NCR5380_local_declare();
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unsigned char status;
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int i;
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NCR5380_setup(instance);
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status = NCR5380_read(STATUS_REG);
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if (!(status & SR_REQ))
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printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
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else {
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for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
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printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
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}
|
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}
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#endif
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|
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/*
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|
* These need tweaking, and would probably work best as per-device
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|
* flags initialized differently for disk, tape, cd, etc devices.
|
|
* People with broken devices are free to experiment as to what gives
|
|
* the best results for them.
|
|
*
|
|
* USLEEP_SLEEP should be a minimum seek time.
|
|
*
|
|
* USLEEP_POLL should be a maximum rotational latency.
|
|
*/
|
|
#ifndef USLEEP_SLEEP
|
|
/* 20 ms (reasonable hard disk speed) */
|
|
#define USLEEP_SLEEP (20*HZ/1000)
|
|
#endif
|
|
/* 300 RPM (floppy speed) */
|
|
#ifndef USLEEP_POLL
|
|
#define USLEEP_POLL (200*HZ/1000)
|
|
#endif
|
|
#ifndef USLEEP_WAITLONG
|
|
/* RvC: (reasonable time to wait on select error) */
|
|
#define USLEEP_WAITLONG USLEEP_SLEEP
|
|
#endif
|
|
|
|
/*
|
|
* Function : int should_disconnect (unsigned char cmd)
|
|
*
|
|
* Purpose : decide whether a command would normally disconnect or
|
|
* not, since if it won't disconnect we should go to sleep.
|
|
*
|
|
* Input : cmd - opcode of SCSI command
|
|
*
|
|
* Returns : DISCONNECT_LONG if we should disconnect for a really long
|
|
* time (ie always, sleep, look for REQ active, sleep),
|
|
* DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
|
|
* time-to-data delay, DISCONNECT_NONE if this command would return
|
|
* immediately.
|
|
*
|
|
* Future sleep algorithms based on time to data can exploit
|
|
* something like this so they can differentiate between "normal"
|
|
* (ie, read, write, seek) and unusual commands (ie, * format).
|
|
*
|
|
* Note : We don't deal with commands that handle an immediate disconnect,
|
|
*
|
|
*/
|
|
|
|
static int should_disconnect(unsigned char cmd)
|
|
{
|
|
switch (cmd) {
|
|
case READ_6:
|
|
case WRITE_6:
|
|
case SEEK_6:
|
|
case READ_10:
|
|
case WRITE_10:
|
|
case SEEK_10:
|
|
return DISCONNECT_TIME_TO_DATA;
|
|
case FORMAT_UNIT:
|
|
case SEARCH_HIGH:
|
|
case SEARCH_LOW:
|
|
case SEARCH_EQUAL:
|
|
return DISCONNECT_LONG;
|
|
default:
|
|
return DISCONNECT_NONE;
|
|
}
|
|
}
|
|
|
|
static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
|
|
{
|
|
hostdata->time_expires = jiffies + timeout;
|
|
schedule_delayed_work(&hostdata->coroutine, timeout);
|
|
}
|
|
|
|
|
|
static int probe_irq __initdata = 0;
|
|
|
|
/**
|
|
* probe_intr - helper for IRQ autoprobe
|
|
* @irq: interrupt number
|
|
* @dev_id: unused
|
|
* @regs: unused
|
|
*
|
|
* Set a flag to indicate the IRQ in question was received. This is
|
|
* used by the IRQ probe code.
|
|
*/
|
|
|
|
static irqreturn_t __init probe_intr(int irq, void *dev_id)
|
|
{
|
|
probe_irq = irq;
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/**
|
|
* NCR5380_probe_irq - find the IRQ of an NCR5380
|
|
* @instance: NCR5380 controller
|
|
* @possible: bitmask of ISA IRQ lines
|
|
*
|
|
* Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
|
|
* and then looking to see what interrupt actually turned up.
|
|
*
|
|
* Locks: none, irqs must be enabled on entry
|
|
*/
|
|
|
|
static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
|
|
int possible)
|
|
{
|
|
NCR5380_local_declare();
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
unsigned long timeout;
|
|
int trying_irqs, i, mask;
|
|
NCR5380_setup(instance);
|
|
|
|
for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
|
|
if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0))
|
|
trying_irqs |= mask;
|
|
|
|
timeout = jiffies + (250 * HZ / 1000);
|
|
probe_irq = SCSI_IRQ_NONE;
|
|
|
|
/*
|
|
* A interrupt is triggered whenever BSY = false, SEL = true
|
|
* and a bit set in the SELECT_ENABLE_REG is asserted on the
|
|
* SCSI bus.
|
|
*
|
|
* Note that the bus is only driven when the phase control signals
|
|
* (I/O, C/D, and MSG) match those in the TCR, so we must reset that
|
|
* to zero.
|
|
*/
|
|
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
|
|
|
|
while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
|
|
schedule_timeout_uninterruptible(1);
|
|
|
|
NCR5380_write(SELECT_ENABLE_REG, 0);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
|
|
if (trying_irqs & mask)
|
|
free_irq(i, NULL);
|
|
|
|
return probe_irq;
|
|
}
|
|
|
|
/**
|
|
* NCR58380_print_options - show options
|
|
* @instance: unused for now
|
|
*
|
|
* Called by probe code indicating the NCR5380 driver options that
|
|
* were selected. At some point this will switch to runtime options
|
|
* read from the adapter in question
|
|
*
|
|
* Locks: none
|
|
*/
|
|
|
|
static void __init __maybe_unused
|
|
NCR5380_print_options(struct Scsi_Host *instance)
|
|
{
|
|
printk(" generic options"
|
|
#ifdef AUTOPROBE_IRQ
|
|
" AUTOPROBE_IRQ"
|
|
#endif
|
|
#ifdef AUTOSENSE
|
|
" AUTOSENSE"
|
|
#endif
|
|
#ifdef DIFFERENTIAL
|
|
" DIFFERENTIAL"
|
|
#endif
|
|
#ifdef REAL_DMA
|
|
" REAL DMA"
|
|
#endif
|
|
#ifdef REAL_DMA_POLL
|
|
" REAL DMA POLL"
|
|
#endif
|
|
#ifdef PARITY
|
|
" PARITY"
|
|
#endif
|
|
#ifdef PSEUDO_DMA
|
|
" PSEUDO DMA"
|
|
#endif
|
|
#ifdef UNSAFE
|
|
" UNSAFE "
|
|
#endif
|
|
);
|
|
printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
|
|
printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
|
|
if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
|
|
printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* NCR5380_print_status - dump controller info
|
|
* @instance: controller to dump
|
|
*
|
|
* Print commands in the various queues, called from NCR5380_abort
|
|
* and NCR5380_debug to aid debugging.
|
|
*
|
|
* Locks: called functions disable irqs
|
|
*/
|
|
|
|
static void NCR5380_print_status(struct Scsi_Host *instance)
|
|
{
|
|
NCR5380_dprint(NDEBUG_ANY, instance);
|
|
NCR5380_dprint_phase(NDEBUG_ANY, instance);
|
|
}
|
|
|
|
/******************************************/
|
|
/*
|
|
* /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
|
|
*
|
|
* *buffer: I/O buffer
|
|
* **start: if inout == FALSE pointer into buffer where user read should start
|
|
* offset: current offset
|
|
* length: length of buffer
|
|
* hostno: Scsi_Host host_no
|
|
* inout: TRUE - user is writing; FALSE - user is reading
|
|
*
|
|
* Return the number of bytes read from or written
|
|
*/
|
|
|
|
static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance,
|
|
char *buffer, int length)
|
|
{
|
|
#ifdef DTC_PUBLIC_RELEASE
|
|
dtc_wmaxi = dtc_maxi = 0;
|
|
#endif
|
|
#ifdef PAS16_PUBLIC_RELEASE
|
|
pas_wmaxi = pas_maxi = 0;
|
|
#endif
|
|
return (-ENOSYS); /* Currently this is a no-op */
|
|
}
|
|
|
|
#undef SPRINTF
|
|
#define SPRINTF(args...) seq_printf(m, ## args)
|
|
static
|
|
void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m);
|
|
static
|
|
void lprint_command(unsigned char *cmd, struct seq_file *m);
|
|
static
|
|
void lprint_opcode(int opcode, struct seq_file *m);
|
|
|
|
static int __maybe_unused NCR5380_show_info(struct seq_file *m,
|
|
struct Scsi_Host *instance)
|
|
{
|
|
struct NCR5380_hostdata *hostdata;
|
|
Scsi_Cmnd *ptr;
|
|
|
|
hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
|
|
SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
|
|
if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
|
|
SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
|
|
#ifdef DTC_PUBLIC_RELEASE
|
|
SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
|
|
#endif
|
|
#ifdef T128_PUBLIC_RELEASE
|
|
SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
|
|
#endif
|
|
#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
|
|
SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
|
|
#endif
|
|
#ifdef PAS16_PUBLIC_RELEASE
|
|
SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
|
|
#endif
|
|
|
|
SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
|
|
SPRINTF("io_port: %04x ", (int) instance->io_port);
|
|
if (instance->irq == SCSI_IRQ_NONE)
|
|
SPRINTF("IRQ: None.\n");
|
|
else
|
|
SPRINTF("IRQ: %d.\n", instance->irq);
|
|
|
|
#ifdef DTC_PUBLIC_RELEASE
|
|
SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi);
|
|
#endif
|
|
#ifdef PAS16_PUBLIC_RELEASE
|
|
SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi);
|
|
#endif
|
|
spin_lock_irq(instance->host_lock);
|
|
if (!hostdata->connected)
|
|
SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
|
|
else
|
|
lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m);
|
|
SPRINTF("scsi%d: issue_queue\n", instance->host_no);
|
|
for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
|
|
lprint_Scsi_Cmnd(ptr, m);
|
|
|
|
SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
|
|
for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
|
|
lprint_Scsi_Cmnd(ptr, m);
|
|
spin_unlock_irq(instance->host_lock);
|
|
return 0;
|
|
}
|
|
|
|
static void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m)
|
|
{
|
|
SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
|
|
SPRINTF(" command = ");
|
|
lprint_command(cmd->cmnd, m);
|
|
}
|
|
|
|
static void lprint_command(unsigned char *command, struct seq_file *m)
|
|
{
|
|
int i, s;
|
|
lprint_opcode(command[0], m);
|
|
for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
|
|
SPRINTF("%02x ", command[i]);
|
|
SPRINTF("\n");
|
|
}
|
|
|
|
static void lprint_opcode(int opcode, struct seq_file *m)
|
|
{
|
|
SPRINTF("%2d (0x%02x)", opcode, opcode);
|
|
}
|
|
|
|
|
|
/**
|
|
* NCR5380_init - initialise an NCR5380
|
|
* @instance: adapter to configure
|
|
* @flags: control flags
|
|
*
|
|
* Initializes *instance and corresponding 5380 chip,
|
|
* with flags OR'd into the initial flags value.
|
|
*
|
|
* Notes : I assume that the host, hostno, and id bits have been
|
|
* set correctly. I don't care about the irq and other fields.
|
|
*
|
|
* Returns 0 for success
|
|
*
|
|
* Locks: interrupts must be enabled when we are called
|
|
*/
|
|
|
|
static int NCR5380_init(struct Scsi_Host *instance, int flags)
|
|
{
|
|
NCR5380_local_declare();
|
|
int i, pass;
|
|
unsigned long timeout;
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
|
|
if(in_interrupt())
|
|
printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
|
|
/*
|
|
* On NCR53C400 boards, NCR5380 registers are mapped 8 past
|
|
* the base address.
|
|
*/
|
|
|
|
#ifdef NCR53C400
|
|
if (flags & FLAG_NCR53C400)
|
|
instance->NCR5380_instance_name += NCR53C400_address_adjust;
|
|
#endif
|
|
|
|
NCR5380_setup(instance);
|
|
|
|
hostdata->aborted = 0;
|
|
hostdata->id_mask = 1 << instance->this_id;
|
|
for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
|
|
if (i > hostdata->id_mask)
|
|
hostdata->id_higher_mask |= i;
|
|
for (i = 0; i < 8; ++i)
|
|
hostdata->busy[i] = 0;
|
|
#ifdef REAL_DMA
|
|
hostdata->dmalen = 0;
|
|
#endif
|
|
hostdata->targets_present = 0;
|
|
hostdata->connected = NULL;
|
|
hostdata->issue_queue = NULL;
|
|
hostdata->disconnected_queue = NULL;
|
|
|
|
INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main);
|
|
|
|
#ifdef NCR5380_STATS
|
|
for (i = 0; i < 8; ++i) {
|
|
hostdata->time_read[i] = 0;
|
|
hostdata->time_write[i] = 0;
|
|
hostdata->bytes_read[i] = 0;
|
|
hostdata->bytes_write[i] = 0;
|
|
}
|
|
hostdata->timebase = 0;
|
|
hostdata->pendingw = 0;
|
|
hostdata->pendingr = 0;
|
|
#endif
|
|
|
|
/* The CHECK code seems to break the 53C400. Will check it later maybe */
|
|
if (flags & FLAG_NCR53C400)
|
|
hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
|
|
else
|
|
hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
|
|
|
|
hostdata->host = instance;
|
|
hostdata->time_expires = 0;
|
|
|
|
#ifndef AUTOSENSE
|
|
if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
|
|
printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n"
|
|
" be incorrectly cleared.\n", instance->host_no);
|
|
#endif /* def AUTOSENSE */
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
NCR5380_write(SELECT_ENABLE_REG, 0);
|
|
|
|
#ifdef NCR53C400
|
|
if (hostdata->flags & FLAG_NCR53C400) {
|
|
NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Detect and correct bus wedge problems.
|
|
*
|
|
* If the system crashed, it may have crashed in a state
|
|
* where a SCSI command was still executing, and the
|
|
* SCSI bus is not in a BUS FREE STATE.
|
|
*
|
|
* If this is the case, we'll try to abort the currently
|
|
* established nexus which we know nothing about, and that
|
|
* failing, do a hard reset of the SCSI bus
|
|
*/
|
|
|
|
for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
|
|
switch (pass) {
|
|
case 1:
|
|
case 3:
|
|
case 5:
|
|
printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
|
|
timeout = jiffies + 5 * HZ;
|
|
NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
|
|
break;
|
|
case 2:
|
|
printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
|
|
do_abort(instance);
|
|
break;
|
|
case 4:
|
|
printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
|
|
do_reset(instance);
|
|
break;
|
|
case 6:
|
|
printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
|
|
return -ENXIO;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* NCR5380_exit - remove an NCR5380
|
|
* @instance: adapter to remove
|
|
*/
|
|
|
|
static void NCR5380_exit(struct Scsi_Host *instance)
|
|
{
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
|
|
cancel_delayed_work_sync(&hostdata->coroutine);
|
|
}
|
|
|
|
/**
|
|
* NCR5380_queue_command - queue a command
|
|
* @cmd: SCSI command
|
|
* @done: completion handler
|
|
*
|
|
* cmd is added to the per instance issue_queue, with minor
|
|
* twiddling done to the host specific fields of cmd. If the
|
|
* main coroutine is not running, it is restarted.
|
|
*
|
|
* Locks: host lock taken by caller
|
|
*/
|
|
|
|
static int NCR5380_queue_command_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
|
|
{
|
|
struct Scsi_Host *instance = cmd->device->host;
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
Scsi_Cmnd *tmp;
|
|
|
|
#if (NDEBUG & NDEBUG_NO_WRITE)
|
|
switch (cmd->cmnd[0]) {
|
|
case WRITE_6:
|
|
case WRITE_10:
|
|
printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
|
|
cmd->result = (DID_ERROR << 16);
|
|
done(cmd);
|
|
return 0;
|
|
}
|
|
#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
|
|
|
|
#ifdef NCR5380_STATS
|
|
switch (cmd->cmnd[0]) {
|
|
case WRITE:
|
|
case WRITE_6:
|
|
case WRITE_10:
|
|
hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
|
|
hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
|
|
hostdata->pendingw++;
|
|
break;
|
|
case READ:
|
|
case READ_6:
|
|
case READ_10:
|
|
hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
|
|
hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
|
|
hostdata->pendingr++;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* We use the host_scribble field as a pointer to the next command
|
|
* in a queue
|
|
*/
|
|
|
|
cmd->host_scribble = NULL;
|
|
cmd->scsi_done = done;
|
|
cmd->result = 0;
|
|
|
|
/*
|
|
* Insert the cmd into the issue queue. Note that REQUEST SENSE
|
|
* commands are added to the head of the queue since any command will
|
|
* clear the contingent allegiance condition that exists and the
|
|
* sense data is only guaranteed to be valid while the condition exists.
|
|
*/
|
|
|
|
if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
|
|
LIST(cmd, hostdata->issue_queue);
|
|
cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
|
|
hostdata->issue_queue = cmd;
|
|
} else {
|
|
for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble);
|
|
LIST(cmd, tmp);
|
|
tmp->host_scribble = (unsigned char *) cmd;
|
|
}
|
|
dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"));
|
|
|
|
/* Run the coroutine if it isn't already running. */
|
|
/* Kick off command processing */
|
|
schedule_delayed_work(&hostdata->coroutine, 0);
|
|
return 0;
|
|
}
|
|
|
|
static DEF_SCSI_QCMD(NCR5380_queue_command)
|
|
|
|
/**
|
|
* NCR5380_main - NCR state machines
|
|
*
|
|
* NCR5380_main is a coroutine that runs as long as more work can
|
|
* be done on the NCR5380 host adapters in a system. Both
|
|
* NCR5380_queue_command() and NCR5380_intr() will try to start it
|
|
* in case it is not running.
|
|
*
|
|
* Locks: called as its own thread with no locks held. Takes the
|
|
* host lock and called routines may take the isa dma lock.
|
|
*/
|
|
|
|
static void NCR5380_main(struct work_struct *work)
|
|
{
|
|
struct NCR5380_hostdata *hostdata =
|
|
container_of(work, struct NCR5380_hostdata, coroutine.work);
|
|
struct Scsi_Host *instance = hostdata->host;
|
|
Scsi_Cmnd *tmp, *prev;
|
|
int done;
|
|
|
|
spin_lock_irq(instance->host_lock);
|
|
do {
|
|
/* Lock held here */
|
|
done = 1;
|
|
if (!hostdata->connected && !hostdata->selecting) {
|
|
dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no));
|
|
/*
|
|
* Search through the issue_queue for a command destined
|
|
* for a target that's not busy.
|
|
*/
|
|
for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
|
|
{
|
|
if (prev != tmp)
|
|
dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun));
|
|
/* When we find one, remove it from the issue queue. */
|
|
if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) {
|
|
if (prev) {
|
|
REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
|
|
prev->host_scribble = tmp->host_scribble;
|
|
} else {
|
|
REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
|
|
hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
|
|
}
|
|
tmp->host_scribble = NULL;
|
|
|
|
/*
|
|
* Attempt to establish an I_T_L nexus here.
|
|
* On success, instance->hostdata->connected is set.
|
|
* On failure, we must add the command back to the
|
|
* issue queue so we can keep trying.
|
|
*/
|
|
dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun));
|
|
|
|
/*
|
|
* A successful selection is defined as one that
|
|
* leaves us with the command connected and
|
|
* in hostdata->connected, OR has terminated the
|
|
* command.
|
|
*
|
|
* With successful commands, we fall through
|
|
* and see if we can do an information transfer,
|
|
* with failures we will restart.
|
|
*/
|
|
hostdata->selecting = NULL;
|
|
/* RvC: have to preset this to indicate a new command is being performed */
|
|
|
|
if (!NCR5380_select(instance, tmp,
|
|
/*
|
|
* REQUEST SENSE commands are issued without tagged
|
|
* queueing, even on SCSI-II devices because the
|
|
* contingent allegiance condition exists for the
|
|
* entire unit.
|
|
*/
|
|
(tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
|
|
break;
|
|
} else {
|
|
LIST(tmp, hostdata->issue_queue);
|
|
tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
|
|
hostdata->issue_queue = tmp;
|
|
done = 0;
|
|
dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no));
|
|
}
|
|
/* lock held here still */
|
|
} /* if target/lun is not busy */
|
|
} /* for */
|
|
/* exited locked */
|
|
} /* if (!hostdata->connected) */
|
|
if (hostdata->selecting) {
|
|
tmp = (Scsi_Cmnd *) hostdata->selecting;
|
|
/* Selection will drop and retake the lock */
|
|
if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) {
|
|
/* Ok ?? */
|
|
} else {
|
|
/* RvC: device failed, so we wait a long time
|
|
this is needed for Mustek scanners, that
|
|
do not respond to commands immediately
|
|
after a scan */
|
|
printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id);
|
|
LIST(tmp, hostdata->issue_queue);
|
|
tmp->host_scribble = (unsigned char *) hostdata->issue_queue;
|
|
hostdata->issue_queue = tmp;
|
|
NCR5380_set_timer(hostdata, USLEEP_WAITLONG);
|
|
}
|
|
} /* if hostdata->selecting */
|
|
if (hostdata->connected
|
|
#ifdef REAL_DMA
|
|
&& !hostdata->dmalen
|
|
#endif
|
|
&& (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies))
|
|
) {
|
|
dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no));
|
|
NCR5380_information_transfer(instance);
|
|
dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no));
|
|
done = 0;
|
|
} else
|
|
break;
|
|
} while (!done);
|
|
|
|
spin_unlock_irq(instance->host_lock);
|
|
}
|
|
|
|
#ifndef DONT_USE_INTR
|
|
|
|
/**
|
|
* NCR5380_intr - generic NCR5380 irq handler
|
|
* @irq: interrupt number
|
|
* @dev_id: device info
|
|
*
|
|
* Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
|
|
* from the disconnected queue, and restarting NCR5380_main()
|
|
* as required.
|
|
*
|
|
* Locks: takes the needed instance locks
|
|
*/
|
|
|
|
static irqreturn_t NCR5380_intr(int dummy, void *dev_id)
|
|
{
|
|
NCR5380_local_declare();
|
|
struct Scsi_Host *instance = dev_id;
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
int done;
|
|
unsigned char basr;
|
|
unsigned long flags;
|
|
|
|
dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n",
|
|
instance->irq));
|
|
|
|
do {
|
|
done = 1;
|
|
spin_lock_irqsave(instance->host_lock, flags);
|
|
/* Look for pending interrupts */
|
|
NCR5380_setup(instance);
|
|
basr = NCR5380_read(BUS_AND_STATUS_REG);
|
|
/* XXX dispatch to appropriate routine if found and done=0 */
|
|
if (basr & BASR_IRQ) {
|
|
NCR5380_dprint(NDEBUG_INTR, instance);
|
|
if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
|
|
done = 0;
|
|
dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no));
|
|
NCR5380_reselect(instance);
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
} else if (basr & BASR_PARITY_ERROR) {
|
|
dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no));
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
} else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
|
|
dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no));
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
} else {
|
|
#if defined(REAL_DMA)
|
|
/*
|
|
* We should only get PHASE MISMATCH and EOP interrupts
|
|
* if we have DMA enabled, so do a sanity check based on
|
|
* the current setting of the MODE register.
|
|
*/
|
|
|
|
if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) {
|
|
int transferred;
|
|
|
|
if (!hostdata->connected)
|
|
panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno);
|
|
|
|
transferred = (hostdata->dmalen - NCR5380_dma_residual(instance));
|
|
hostdata->connected->SCp.this_residual -= transferred;
|
|
hostdata->connected->SCp.ptr += transferred;
|
|
hostdata->dmalen = 0;
|
|
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
|
|
/* FIXME: we need to poll briefly then defer a workqueue task ! */
|
|
NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ);
|
|
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
}
|
|
#else
|
|
dprintk(NDEBUG_INTR, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)));
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
#endif
|
|
}
|
|
} /* if BASR_IRQ */
|
|
spin_unlock_irqrestore(instance->host_lock, flags);
|
|
if(!done)
|
|
schedule_delayed_work(&hostdata->coroutine, 0);
|
|
} while (!done);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
#endif
|
|
|
|
/**
|
|
* collect_stats - collect stats on a scsi command
|
|
* @hostdata: adapter
|
|
* @cmd: command being issued
|
|
*
|
|
* Update the statistical data by parsing the command in question
|
|
*/
|
|
|
|
static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd)
|
|
{
|
|
#ifdef NCR5380_STATS
|
|
switch (cmd->cmnd[0]) {
|
|
case WRITE:
|
|
case WRITE_6:
|
|
case WRITE_10:
|
|
hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase);
|
|
hostdata->pendingw--;
|
|
break;
|
|
case READ:
|
|
case READ_6:
|
|
case READ_10:
|
|
hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase);
|
|
hostdata->pendingr--;
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
|
|
* int tag);
|
|
*
|
|
* Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
|
|
* including ARBITRATION, SELECTION, and initial message out for
|
|
* IDENTIFY and queue messages.
|
|
*
|
|
* Inputs : instance - instantiation of the 5380 driver on which this
|
|
* target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
|
|
* new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
|
|
* the command that is presently connected.
|
|
*
|
|
* Returns : -1 if selection could not execute for some reason,
|
|
* 0 if selection succeeded or failed because the target
|
|
* did not respond.
|
|
*
|
|
* Side effects :
|
|
* If bus busy, arbitration failed, etc, NCR5380_select() will exit
|
|
* with registers as they should have been on entry - ie
|
|
* SELECT_ENABLE will be set appropriately, the NCR5380
|
|
* will cease to drive any SCSI bus signals.
|
|
*
|
|
* If successful : I_T_L or I_T_L_Q nexus will be established,
|
|
* instance->connected will be set to cmd.
|
|
* SELECT interrupt will be disabled.
|
|
*
|
|
* If failed (no target) : cmd->scsi_done() will be called, and the
|
|
* cmd->result host byte set to DID_BAD_TARGET.
|
|
*
|
|
* Locks: caller holds hostdata lock in IRQ mode
|
|
*/
|
|
|
|
static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag)
|
|
{
|
|
NCR5380_local_declare();
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
unsigned char tmp[3], phase;
|
|
unsigned char *data;
|
|
int len;
|
|
unsigned long timeout;
|
|
unsigned char value;
|
|
int err;
|
|
NCR5380_setup(instance);
|
|
|
|
if (hostdata->selecting)
|
|
goto part2;
|
|
|
|
hostdata->restart_select = 0;
|
|
|
|
NCR5380_dprint(NDEBUG_ARBITRATION, instance);
|
|
dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id));
|
|
|
|
/*
|
|
* Set the phase bits to 0, otherwise the NCR5380 won't drive the
|
|
* data bus during SELECTION.
|
|
*/
|
|
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
|
|
/*
|
|
* Start arbitration.
|
|
*/
|
|
|
|
NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
|
|
NCR5380_write(MODE_REG, MR_ARBITRATE);
|
|
|
|
|
|
/* We can be relaxed here, interrupts are on, we are
|
|
in workqueue context, the birds are singing in the trees */
|
|
spin_unlock_irq(instance->host_lock);
|
|
err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ);
|
|
spin_lock_irq(instance->host_lock);
|
|
if (err < 0) {
|
|
printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__);
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
goto failed;
|
|
}
|
|
|
|
dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no));
|
|
|
|
/*
|
|
* The arbitration delay is 2.2us, but this is a minimum and there is
|
|
* no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
|
|
* the integral nature of udelay().
|
|
*
|
|
*/
|
|
|
|
udelay(3);
|
|
|
|
/* Check for lost arbitration */
|
|
if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no));
|
|
goto failed;
|
|
}
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
|
|
|
|
if (!(hostdata->flags & FLAG_DTC3181E) &&
|
|
/* RvC: DTC3181E has some trouble with this
|
|
* so we simply removed it. Seems to work with
|
|
* only Mustek scanner attached
|
|
*/
|
|
(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no));
|
|
goto failed;
|
|
}
|
|
/*
|
|
* Again, bus clear + bus settle time is 1.2us, however, this is
|
|
* a minimum so we'll udelay ceil(1.2)
|
|
*/
|
|
|
|
udelay(2);
|
|
|
|
dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no));
|
|
|
|
/*
|
|
* Now that we have won arbitration, start Selection process, asserting
|
|
* the host and target ID's on the SCSI bus.
|
|
*/
|
|
|
|
NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
|
|
|
|
/*
|
|
* Raise ATN while SEL is true before BSY goes false from arbitration,
|
|
* since this is the only way to guarantee that we'll get a MESSAGE OUT
|
|
* phase immediately after selection.
|
|
*/
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
|
|
/*
|
|
* Reselect interrupts must be turned off prior to the dropping of BSY,
|
|
* otherwise we will trigger an interrupt.
|
|
*/
|
|
NCR5380_write(SELECT_ENABLE_REG, 0);
|
|
|
|
/*
|
|
* The initiator shall then wait at least two deskew delays and release
|
|
* the BSY signal.
|
|
*/
|
|
udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
|
|
|
|
/* Reset BSY */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
|
|
|
|
/*
|
|
* Something weird happens when we cease to drive BSY - looks
|
|
* like the board/chip is letting us do another read before the
|
|
* appropriate propagation delay has expired, and we're confusing
|
|
* a BSY signal from ourselves as the target's response to SELECTION.
|
|
*
|
|
* A small delay (the 'C++' frontend breaks the pipeline with an
|
|
* unnecessary jump, making it work on my 386-33/Trantor T128, the
|
|
* tighter 'C' code breaks and requires this) solves the problem -
|
|
* the 1 us delay is arbitrary, and only used because this delay will
|
|
* be the same on other platforms and since it works here, it should
|
|
* work there.
|
|
*
|
|
* wingel suggests that this could be due to failing to wait
|
|
* one deskew delay.
|
|
*/
|
|
|
|
udelay(1);
|
|
|
|
dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)));
|
|
|
|
/*
|
|
* The SCSI specification calls for a 250 ms timeout for the actual
|
|
* selection.
|
|
*/
|
|
|
|
timeout = jiffies + (250 * HZ / 1000);
|
|
|
|
/*
|
|
* XXX very interesting - we're seeing a bounce where the BSY we
|
|
* asserted is being reflected / still asserted (propagation delay?)
|
|
* and it's detecting as true. Sigh.
|
|
*/
|
|
|
|
hostdata->select_time = 0; /* we count the clock ticks at which we polled */
|
|
hostdata->selecting = cmd;
|
|
|
|
part2:
|
|
/* RvC: here we enter after a sleeping period, or immediately after
|
|
execution of part 1
|
|
we poll only once ech clock tick */
|
|
value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO);
|
|
|
|
if (!value && (hostdata->select_time < HZ/4)) {
|
|
/* RvC: we still must wait for a device response */
|
|
hostdata->select_time++; /* after 25 ticks the device has failed */
|
|
NCR5380_set_timer(hostdata, 1);
|
|
return 0; /* RvC: we return here with hostdata->selecting set,
|
|
to go to sleep */
|
|
}
|
|
|
|
hostdata->selecting = NULL;/* clear this pointer, because we passed the
|
|
waiting period */
|
|
if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
NCR5380_reselect(instance);
|
|
printk("scsi%d : reselection after won arbitration?\n", instance->host_no);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
return -1;
|
|
}
|
|
/*
|
|
* No less than two deskew delays after the initiator detects the
|
|
* BSY signal is true, it shall release the SEL signal and may
|
|
* change the DATA BUS. -wingel
|
|
*/
|
|
|
|
udelay(1);
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
|
|
if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
if (hostdata->targets_present & (1 << scmd_id(cmd))) {
|
|
printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no);
|
|
if (hostdata->restart_select)
|
|
printk(KERN_DEBUG "\trestart select\n");
|
|
NCR5380_dprint(NDEBUG_SELECTION, instance);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
return -1;
|
|
}
|
|
cmd->result = DID_BAD_TARGET << 16;
|
|
collect_stats(hostdata, cmd);
|
|
cmd->scsi_done(cmd);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no));
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
return 0;
|
|
}
|
|
hostdata->targets_present |= (1 << scmd_id(cmd));
|
|
|
|
/*
|
|
* Since we followed the SCSI spec, and raised ATN while SEL
|
|
* was true but before BSY was false during selection, the information
|
|
* transfer phase should be a MESSAGE OUT phase so that we can send the
|
|
* IDENTIFY message.
|
|
*
|
|
* If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
|
|
* message (2 bytes) with a tag ID that we increment with every command
|
|
* until it wraps back to 0.
|
|
*
|
|
* XXX - it turns out that there are some broken SCSI-II devices,
|
|
* which claim to support tagged queuing but fail when more than
|
|
* some number of commands are issued at once.
|
|
*/
|
|
|
|
/* Wait for start of REQ/ACK handshake */
|
|
|
|
spin_unlock_irq(instance->host_lock);
|
|
err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
|
|
spin_lock_irq(instance->host_lock);
|
|
|
|
if(err) {
|
|
printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
goto failed;
|
|
}
|
|
|
|
dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id));
|
|
tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun);
|
|
|
|
len = 1;
|
|
cmd->tag = 0;
|
|
|
|
/* Send message(s) */
|
|
data = tmp;
|
|
phase = PHASE_MSGOUT;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no));
|
|
/* XXX need to handle errors here */
|
|
hostdata->connected = cmd;
|
|
hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
|
|
|
|
initialize_SCp(cmd);
|
|
|
|
return 0;
|
|
|
|
/* Selection failed */
|
|
failed:
|
|
return -1;
|
|
|
|
}
|
|
|
|
/*
|
|
* Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
|
|
* unsigned char *phase, int *count, unsigned char **data)
|
|
*
|
|
* Purpose : transfers data in given phase using polled I/O
|
|
*
|
|
* Inputs : instance - instance of driver, *phase - pointer to
|
|
* what phase is expected, *count - pointer to number of
|
|
* bytes to transfer, **data - pointer to data pointer.
|
|
*
|
|
* Returns : -1 when different phase is entered without transferring
|
|
* maximum number of bytes, 0 if all bytes or transferred or exit
|
|
* is in same phase.
|
|
*
|
|
* Also, *phase, *count, *data are modified in place.
|
|
*
|
|
* XXX Note : handling for bus free may be useful.
|
|
*/
|
|
|
|
/*
|
|
* Note : this code is not as quick as it could be, however it
|
|
* IS 100% reliable, and for the actual data transfer where speed
|
|
* counts, we will always do a pseudo DMA or DMA transfer.
|
|
*/
|
|
|
|
static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
|
|
NCR5380_local_declare();
|
|
unsigned char p = *phase, tmp;
|
|
int c = *count;
|
|
unsigned char *d = *data;
|
|
/*
|
|
* RvC: some administrative data to process polling time
|
|
*/
|
|
int break_allowed = 0;
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
NCR5380_setup(instance);
|
|
|
|
if (!(p & SR_IO))
|
|
dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c));
|
|
else
|
|
dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c));
|
|
|
|
/*
|
|
* The NCR5380 chip will only drive the SCSI bus when the
|
|
* phase specified in the appropriate bits of the TARGET COMMAND
|
|
* REGISTER match the STATUS REGISTER
|
|
*/
|
|
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
|
|
|
|
/* RvC: don't know if this is necessary, but other SCSI I/O is short
|
|
* so breaks are not necessary there
|
|
*/
|
|
if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) {
|
|
break_allowed = 1;
|
|
}
|
|
do {
|
|
/*
|
|
* Wait for assertion of REQ, after which the phase bits will be
|
|
* valid
|
|
*/
|
|
|
|
/* RvC: we simply poll once, after that we stop temporarily
|
|
* and let the device buffer fill up
|
|
* if breaking is not allowed, we keep polling as long as needed
|
|
*/
|
|
|
|
/* FIXME */
|
|
while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed);
|
|
if (!(tmp & SR_REQ)) {
|
|
/* timeout condition */
|
|
NCR5380_set_timer(hostdata, USLEEP_SLEEP);
|
|
break;
|
|
}
|
|
|
|
dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no));
|
|
|
|
/* Check for phase mismatch */
|
|
if ((tmp & PHASE_MASK) != p) {
|
|
dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no));
|
|
NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance);
|
|
break;
|
|
}
|
|
/* Do actual transfer from SCSI bus to / from memory */
|
|
if (!(p & SR_IO))
|
|
NCR5380_write(OUTPUT_DATA_REG, *d);
|
|
else
|
|
*d = NCR5380_read(CURRENT_SCSI_DATA_REG);
|
|
|
|
++d;
|
|
|
|
/*
|
|
* The SCSI standard suggests that in MSGOUT phase, the initiator
|
|
* should drop ATN on the last byte of the message phase
|
|
* after REQ has been asserted for the handshake but before
|
|
* the initiator raises ACK.
|
|
*/
|
|
|
|
if (!(p & SR_IO)) {
|
|
if (!((p & SR_MSG) && c > 1)) {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
|
|
NCR5380_dprint(NDEBUG_PIO, instance);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK);
|
|
} else {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN);
|
|
NCR5380_dprint(NDEBUG_PIO, instance);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
|
|
}
|
|
} else {
|
|
NCR5380_dprint(NDEBUG_PIO, instance);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
|
|
}
|
|
|
|
/* FIXME - if this fails bus reset ?? */
|
|
NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ);
|
|
dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no));
|
|
|
|
/*
|
|
* We have several special cases to consider during REQ/ACK handshaking :
|
|
* 1. We were in MSGOUT phase, and we are on the last byte of the
|
|
* message. ATN must be dropped as ACK is dropped.
|
|
*
|
|
* 2. We are in a MSGIN phase, and we are on the last byte of the
|
|
* message. We must exit with ACK asserted, so that the calling
|
|
* code may raise ATN before dropping ACK to reject the message.
|
|
*
|
|
* 3. ACK and ATN are clear and the target may proceed as normal.
|
|
*/
|
|
if (!(p == PHASE_MSGIN && c == 1)) {
|
|
if (p == PHASE_MSGOUT && c > 1)
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
else
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
}
|
|
} while (--c);
|
|
|
|
dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c));
|
|
|
|
*count = c;
|
|
*data = d;
|
|
tmp = NCR5380_read(STATUS_REG);
|
|
if (tmp & SR_REQ)
|
|
*phase = tmp & PHASE_MASK;
|
|
else
|
|
*phase = PHASE_UNKNOWN;
|
|
|
|
if (!c || (*phase == p))
|
|
return 0;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* do_reset - issue a reset command
|
|
* @host: adapter to reset
|
|
*
|
|
* Issue a reset sequence to the NCR5380 and try and get the bus
|
|
* back into sane shape.
|
|
*
|
|
* Locks: caller holds queue lock
|
|
*/
|
|
|
|
static void do_reset(struct Scsi_Host *host) {
|
|
NCR5380_local_declare();
|
|
NCR5380_setup(host);
|
|
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
|
|
udelay(25);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
}
|
|
|
|
/*
|
|
* Function : do_abort (Scsi_Host *host)
|
|
*
|
|
* Purpose : abort the currently established nexus. Should only be
|
|
* called from a routine which can drop into a
|
|
*
|
|
* Returns : 0 on success, -1 on failure.
|
|
*
|
|
* Locks: queue lock held by caller
|
|
* FIXME: sort this out and get new_eh running
|
|
*/
|
|
|
|
static int do_abort(struct Scsi_Host *host) {
|
|
NCR5380_local_declare();
|
|
unsigned char *msgptr, phase, tmp;
|
|
int len;
|
|
int rc;
|
|
NCR5380_setup(host);
|
|
|
|
|
|
/* Request message out phase */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
|
|
/*
|
|
* Wait for the target to indicate a valid phase by asserting
|
|
* REQ. Once this happens, we'll have either a MSGOUT phase
|
|
* and can immediately send the ABORT message, or we'll have some
|
|
* other phase and will have to source/sink data.
|
|
*
|
|
* We really don't care what value was on the bus or what value
|
|
* the target sees, so we just handshake.
|
|
*/
|
|
|
|
rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ);
|
|
|
|
if(rc < 0)
|
|
return -1;
|
|
|
|
tmp = (unsigned char)rc;
|
|
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
|
|
|
|
if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
|
|
rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
if(rc == -1)
|
|
return -1;
|
|
}
|
|
tmp = ABORT;
|
|
msgptr = &tmp;
|
|
len = 1;
|
|
phase = PHASE_MSGOUT;
|
|
NCR5380_transfer_pio(host, &phase, &len, &msgptr);
|
|
|
|
/*
|
|
* If we got here, and the command completed successfully,
|
|
* we're about to go into bus free state.
|
|
*/
|
|
|
|
return len ? -1 : 0;
|
|
}
|
|
|
|
#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
|
|
/*
|
|
* Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
|
|
* unsigned char *phase, int *count, unsigned char **data)
|
|
*
|
|
* Purpose : transfers data in given phase using either real
|
|
* or pseudo DMA.
|
|
*
|
|
* Inputs : instance - instance of driver, *phase - pointer to
|
|
* what phase is expected, *count - pointer to number of
|
|
* bytes to transfer, **data - pointer to data pointer.
|
|
*
|
|
* Returns : -1 when different phase is entered without transferring
|
|
* maximum number of bytes, 0 if all bytes or transferred or exit
|
|
* is in same phase.
|
|
*
|
|
* Also, *phase, *count, *data are modified in place.
|
|
*
|
|
* Locks: io_request lock held by caller
|
|
*/
|
|
|
|
|
|
static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) {
|
|
NCR5380_local_declare();
|
|
register int c = *count;
|
|
register unsigned char p = *phase;
|
|
register unsigned char *d = *data;
|
|
unsigned char tmp;
|
|
int foo;
|
|
#if defined(REAL_DMA_POLL)
|
|
int cnt, toPIO;
|
|
unsigned char saved_data = 0, overrun = 0, residue;
|
|
#endif
|
|
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
|
|
NCR5380_setup(instance);
|
|
|
|
if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
|
|
*phase = tmp;
|
|
return -1;
|
|
}
|
|
#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
|
|
#ifdef READ_OVERRUNS
|
|
if (p & SR_IO) {
|
|
c -= 2;
|
|
}
|
|
#endif
|
|
dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d));
|
|
hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
|
|
#endif
|
|
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
|
|
|
|
#ifdef REAL_DMA
|
|
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
|
|
#elif defined(REAL_DMA_POLL)
|
|
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
|
|
#else
|
|
/*
|
|
* Note : on my sample board, watch-dog timeouts occurred when interrupts
|
|
* were not disabled for the duration of a single DMA transfer, from
|
|
* before the setting of DMA mode to after transfer of the last byte.
|
|
*/
|
|
|
|
#if defined(PSEUDO_DMA) && defined(UNSAFE)
|
|
spin_unlock_irq(instance->host_lock);
|
|
#endif
|
|
/* KLL May need eop and parity in 53c400 */
|
|
if (hostdata->flags & FLAG_NCR53C400)
|
|
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE |
|
|
MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR |
|
|
MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
|
|
else
|
|
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
|
|
#endif /* def REAL_DMA */
|
|
|
|
dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)));
|
|
|
|
/*
|
|
* On the PAS16 at least I/O recovery delays are not needed here.
|
|
* Everyone else seems to want them.
|
|
*/
|
|
|
|
if (p & SR_IO) {
|
|
io_recovery_delay(1);
|
|
NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
|
|
} else {
|
|
io_recovery_delay(1);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
|
|
io_recovery_delay(1);
|
|
NCR5380_write(START_DMA_SEND_REG, 0);
|
|
io_recovery_delay(1);
|
|
}
|
|
|
|
#if defined(REAL_DMA_POLL)
|
|
do {
|
|
tmp = NCR5380_read(BUS_AND_STATUS_REG);
|
|
} while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
|
|
|
|
/*
|
|
At this point, either we've completed DMA, or we have a phase mismatch,
|
|
or we've unexpectedly lost BUSY (which is a real error).
|
|
|
|
For write DMAs, we want to wait until the last byte has been
|
|
transferred out over the bus before we turn off DMA mode. Alas, there
|
|
seems to be no terribly good way of doing this on a 5380 under all
|
|
conditions. For non-scatter-gather operations, we can wait until REQ
|
|
and ACK both go false, or until a phase mismatch occurs. Gather-writes
|
|
are nastier, since the device will be expecting more data than we
|
|
are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
|
|
could test LAST BIT SENT to assure transfer (I imagine this is precisely
|
|
why this signal was added to the newer chips) but on the older 538[01]
|
|
this signal does not exist. The workaround for this lack is a watchdog;
|
|
we bail out of the wait-loop after a modest amount of wait-time if
|
|
the usual exit conditions are not met. Not a terribly clean or
|
|
correct solution :-%
|
|
|
|
Reads are equally tricky due to a nasty characteristic of the NCR5380.
|
|
If the chip is in DMA mode for an READ, it will respond to a target's
|
|
REQ by latching the SCSI data into the INPUT DATA register and asserting
|
|
ACK, even if it has _already_ been notified by the DMA controller that
|
|
the current DMA transfer has completed! If the NCR5380 is then taken
|
|
out of DMA mode, this already-acknowledged byte is lost.
|
|
|
|
This is not a problem for "one DMA transfer per command" reads, because
|
|
the situation will never arise... either all of the data is DMA'ed
|
|
properly, or the target switches to MESSAGE IN phase to signal a
|
|
disconnection (either operation bringing the DMA to a clean halt).
|
|
However, in order to handle scatter-reads, we must work around the
|
|
problem. The chosen fix is to DMA N-2 bytes, then check for the
|
|
condition before taking the NCR5380 out of DMA mode. One or two extra
|
|
bytes are transferred via PIO as necessary to fill out the original
|
|
request.
|
|
*/
|
|
|
|
if (p & SR_IO) {
|
|
#ifdef READ_OVERRUNS
|
|
udelay(10);
|
|
if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) {
|
|
saved_data = NCR5380_read(INPUT_DATA_REGISTER);
|
|
overrun = 1;
|
|
}
|
|
#endif
|
|
} else {
|
|
int limit = 100;
|
|
while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
|
|
if (!(tmp & BASR_PHASE_MATCH))
|
|
break;
|
|
if (--limit < 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)));
|
|
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
residue = NCR5380_dma_residual(instance);
|
|
c -= residue;
|
|
*count -= c;
|
|
*data += c;
|
|
*phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
|
|
|
|
#ifdef READ_OVERRUNS
|
|
if (*phase == p && (p & SR_IO) && residue == 0) {
|
|
if (overrun) {
|
|
dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n"));
|
|
**data = saved_data;
|
|
*data += 1;
|
|
*count -= 1;
|
|
cnt = toPIO = 1;
|
|
} else {
|
|
printk("No overrun??\n");
|
|
cnt = toPIO = 2;
|
|
}
|
|
dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data));
|
|
NCR5380_transfer_pio(instance, phase, &cnt, data);
|
|
*count -= toPIO - cnt;
|
|
}
|
|
#endif
|
|
|
|
dprintk(NDEBUG_DMA, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count)));
|
|
return 0;
|
|
|
|
#elif defined(REAL_DMA)
|
|
return 0;
|
|
#else /* defined(REAL_DMA_POLL) */
|
|
if (p & SR_IO) {
|
|
#ifdef DMA_WORKS_RIGHT
|
|
foo = NCR5380_pread(instance, d, c);
|
|
#else
|
|
int diff = 1;
|
|
if (hostdata->flags & FLAG_NCR53C400) {
|
|
diff = 0;
|
|
}
|
|
if (!(foo = NCR5380_pread(instance, d, c - diff))) {
|
|
/*
|
|
* We can't disable DMA mode after successfully transferring
|
|
* what we plan to be the last byte, since that would open up
|
|
* a race condition where if the target asserted REQ before
|
|
* we got the DMA mode reset, the NCR5380 would have latched
|
|
* an additional byte into the INPUT DATA register and we'd
|
|
* have dropped it.
|
|
*
|
|
* The workaround was to transfer one fewer bytes than we
|
|
* intended to with the pseudo-DMA read function, wait for
|
|
* the chip to latch the last byte, read it, and then disable
|
|
* pseudo-DMA mode.
|
|
*
|
|
* After REQ is asserted, the NCR5380 asserts DRQ and ACK.
|
|
* REQ is deasserted when ACK is asserted, and not reasserted
|
|
* until ACK goes false. Since the NCR5380 won't lower ACK
|
|
* until DACK is asserted, which won't happen unless we twiddle
|
|
* the DMA port or we take the NCR5380 out of DMA mode, we
|
|
* can guarantee that we won't handshake another extra
|
|
* byte.
|
|
*/
|
|
|
|
if (!(hostdata->flags & FLAG_NCR53C400)) {
|
|
while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
|
|
/* Wait for clean handshake */
|
|
while (NCR5380_read(STATUS_REG) & SR_REQ);
|
|
d[c - 1] = NCR5380_read(INPUT_DATA_REG);
|
|
}
|
|
}
|
|
#endif
|
|
} else {
|
|
#ifdef DMA_WORKS_RIGHT
|
|
foo = NCR5380_pwrite(instance, d, c);
|
|
#else
|
|
int timeout;
|
|
dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c));
|
|
if (!(foo = NCR5380_pwrite(instance, d, c))) {
|
|
/*
|
|
* Wait for the last byte to be sent. If REQ is being asserted for
|
|
* the byte we're interested, we'll ACK it and it will go false.
|
|
*/
|
|
if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
|
|
timeout = 20000;
|
|
while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
|
|
|
|
if (!timeout)
|
|
dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no));
|
|
|
|
if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
|
|
hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
|
|
if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
|
|
hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
|
|
dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no));
|
|
}
|
|
}
|
|
} else {
|
|
dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n"));
|
|
while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
|
|
dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n"));
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
|
|
dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n"));
|
|
if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
|
|
dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n"));
|
|
NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
} else {
|
|
printk("53C400w: IRQ NOT THERE!\n");
|
|
}
|
|
}
|
|
*data = d + c;
|
|
*count = 0;
|
|
*phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
|
|
#if defined(PSEUDO_DMA) && defined(UNSAFE)
|
|
spin_lock_irq(instance->host_lock);
|
|
#endif /* defined(REAL_DMA_POLL) */
|
|
return foo;
|
|
#endif /* def REAL_DMA */
|
|
}
|
|
#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
|
|
|
|
/*
|
|
* Function : NCR5380_information_transfer (struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : run through the various SCSI phases and do as the target
|
|
* directs us to. Operates on the currently connected command,
|
|
* instance->connected.
|
|
*
|
|
* Inputs : instance, instance for which we are doing commands
|
|
*
|
|
* Side effects : SCSI things happen, the disconnected queue will be
|
|
* modified if a command disconnects, *instance->connected will
|
|
* change.
|
|
*
|
|
* XXX Note : we need to watch for bus free or a reset condition here
|
|
* to recover from an unexpected bus free condition.
|
|
*
|
|
* Locks: io_request_lock held by caller in IRQ mode
|
|
*/
|
|
|
|
static void NCR5380_information_transfer(struct Scsi_Host *instance) {
|
|
NCR5380_local_declare();
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata;
|
|
unsigned char msgout = NOP;
|
|
int sink = 0;
|
|
int len;
|
|
#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
|
|
int transfersize;
|
|
#endif
|
|
unsigned char *data;
|
|
unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
|
|
Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
|
|
/* RvC: we need to set the end of the polling time */
|
|
unsigned long poll_time = jiffies + USLEEP_POLL;
|
|
|
|
NCR5380_setup(instance);
|
|
|
|
while (1) {
|
|
tmp = NCR5380_read(STATUS_REG);
|
|
/* We only have a valid SCSI phase when REQ is asserted */
|
|
if (tmp & SR_REQ) {
|
|
phase = (tmp & PHASE_MASK);
|
|
if (phase != old_phase) {
|
|
old_phase = phase;
|
|
NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
|
|
}
|
|
if (sink && (phase != PHASE_MSGOUT)) {
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
|
|
while (NCR5380_read(STATUS_REG) & SR_REQ);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
sink = 0;
|
|
continue;
|
|
}
|
|
switch (phase) {
|
|
case PHASE_DATAIN:
|
|
case PHASE_DATAOUT:
|
|
#if (NDEBUG & NDEBUG_NO_DATAOUT)
|
|
printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no);
|
|
sink = 1;
|
|
do_abort(instance);
|
|
cmd->result = DID_ERROR << 16;
|
|
cmd->scsi_done(cmd);
|
|
return;
|
|
#endif
|
|
/*
|
|
* If there is no room left in the current buffer in the
|
|
* scatter-gather list, move onto the next one.
|
|
*/
|
|
|
|
if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
|
|
++cmd->SCp.buffer;
|
|
--cmd->SCp.buffers_residual;
|
|
cmd->SCp.this_residual = cmd->SCp.buffer->length;
|
|
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
|
|
dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual));
|
|
}
|
|
/*
|
|
* The preferred transfer method is going to be
|
|
* PSEUDO-DMA for systems that are strictly PIO,
|
|
* since we can let the hardware do the handshaking.
|
|
*
|
|
* For this to work, we need to know the transfersize
|
|
* ahead of time, since the pseudo-DMA code will sit
|
|
* in an unconditional loop.
|
|
*/
|
|
|
|
#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
|
|
/* KLL
|
|
* PSEUDO_DMA is defined here. If this is the g_NCR5380
|
|
* driver then it will always be defined, so the
|
|
* FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
|
|
* NCR5380 case. I think this is a fairly clean solution.
|
|
* We supplement these 2 if's with the flag.
|
|
*/
|
|
#ifdef NCR5380_dma_xfer_len
|
|
if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
|
|
#else
|
|
transfersize = cmd->transfersize;
|
|
|
|
#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
|
|
if (transfersize > 512)
|
|
transfersize = 512;
|
|
#endif /* LIMIT_TRANSFERSIZE */
|
|
|
|
if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
|
|
/* Limit transfers to 32K, for xx400 & xx406
|
|
* pseudoDMA that transfers in 128 bytes blocks. */
|
|
if (transfersize > 32 * 1024)
|
|
transfersize = 32 * 1024;
|
|
#endif
|
|
len = transfersize;
|
|
if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
|
|
/*
|
|
* If the watchdog timer fires, all future accesses to this
|
|
* device will use the polled-IO.
|
|
*/
|
|
scmd_printk(KERN_INFO, cmd,
|
|
"switching to slow handshake\n");
|
|
cmd->device->borken = 1;
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
sink = 1;
|
|
do_abort(instance);
|
|
cmd->result = DID_ERROR << 16;
|
|
cmd->scsi_done(cmd);
|
|
/* XXX - need to source or sink data here, as appropriate */
|
|
} else
|
|
cmd->SCp.this_residual -= transfersize - len;
|
|
} else
|
|
#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
|
|
NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **)
|
|
&cmd->SCp.ptr);
|
|
break;
|
|
case PHASE_MSGIN:
|
|
len = 1;
|
|
data = &tmp;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
cmd->SCp.Message = tmp;
|
|
|
|
switch (tmp) {
|
|
/*
|
|
* Linking lets us reduce the time required to get the
|
|
* next command out to the device, hopefully this will
|
|
* mean we don't waste another revolution due to the delays
|
|
* required by ARBITRATION and another SELECTION.
|
|
*
|
|
* In the current implementation proposal, low level drivers
|
|
* merely have to start the next command, pointed to by
|
|
* next_link, done() is called as with unlinked commands.
|
|
*/
|
|
#ifdef LINKED
|
|
case LINKED_CMD_COMPLETE:
|
|
case LINKED_FLG_CMD_COMPLETE:
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun));
|
|
/*
|
|
* Sanity check : A linked command should only terminate with
|
|
* one of these messages if there are more linked commands
|
|
* available.
|
|
*/
|
|
if (!cmd->next_link) {
|
|
printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun);
|
|
sink = 1;
|
|
do_abort(instance);
|
|
return;
|
|
}
|
|
initialize_SCp(cmd->next_link);
|
|
/* The next command is still part of this process */
|
|
cmd->next_link->tag = cmd->tag;
|
|
cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
|
|
dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun));
|
|
collect_stats(hostdata, cmd);
|
|
cmd->scsi_done(cmd);
|
|
cmd = hostdata->connected;
|
|
break;
|
|
#endif /* def LINKED */
|
|
case ABORT:
|
|
case COMMAND_COMPLETE:
|
|
/* Accept message by clearing ACK */
|
|
sink = 1;
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
hostdata->connected = NULL;
|
|
dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun));
|
|
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
|
|
|
|
/*
|
|
* I'm not sure what the correct thing to do here is :
|
|
*
|
|
* If the command that just executed is NOT a request
|
|
* sense, the obvious thing to do is to set the result
|
|
* code to the values of the stored parameters.
|
|
*
|
|
* If it was a REQUEST SENSE command, we need some way
|
|
* to differentiate between the failure code of the original
|
|
* and the failure code of the REQUEST sense - the obvious
|
|
* case is success, where we fall through and leave the result
|
|
* code unchanged.
|
|
*
|
|
* The non-obvious place is where the REQUEST SENSE failed
|
|
*/
|
|
|
|
if (cmd->cmnd[0] != REQUEST_SENSE)
|
|
cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
|
|
else if (status_byte(cmd->SCp.Status) != GOOD)
|
|
cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
|
|
|
|
#ifdef AUTOSENSE
|
|
if ((cmd->cmnd[0] == REQUEST_SENSE) &&
|
|
hostdata->ses.cmd_len) {
|
|
scsi_eh_restore_cmnd(cmd, &hostdata->ses);
|
|
hostdata->ses.cmd_len = 0 ;
|
|
}
|
|
|
|
if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
|
|
scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
|
|
|
|
dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no));
|
|
|
|
LIST(cmd, hostdata->issue_queue);
|
|
cmd->host_scribble = (unsigned char *)
|
|
hostdata->issue_queue;
|
|
hostdata->issue_queue = (Scsi_Cmnd *) cmd;
|
|
dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no));
|
|
} else
|
|
#endif /* def AUTOSENSE */
|
|
{
|
|
collect_stats(hostdata, cmd);
|
|
cmd->scsi_done(cmd);
|
|
}
|
|
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
/*
|
|
* Restore phase bits to 0 so an interrupted selection,
|
|
* arbitration can resume.
|
|
*/
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
|
|
while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
|
|
barrier();
|
|
return;
|
|
case MESSAGE_REJECT:
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
switch (hostdata->last_message) {
|
|
case HEAD_OF_QUEUE_TAG:
|
|
case ORDERED_QUEUE_TAG:
|
|
case SIMPLE_QUEUE_TAG:
|
|
cmd->device->simple_tags = 0;
|
|
hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
case DISCONNECT:{
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
cmd->device->disconnect = 1;
|
|
LIST(cmd, hostdata->disconnected_queue);
|
|
cmd->host_scribble = (unsigned char *)
|
|
hostdata->disconnected_queue;
|
|
hostdata->connected = NULL;
|
|
hostdata->disconnected_queue = cmd;
|
|
dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun));
|
|
/*
|
|
* Restore phase bits to 0 so an interrupted selection,
|
|
* arbitration can resume.
|
|
*/
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
|
|
/* Enable reselect interrupts */
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
/* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/
|
|
/* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */
|
|
while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
|
|
barrier();
|
|
return;
|
|
}
|
|
/*
|
|
* The SCSI data pointer is *IMPLICITLY* saved on a disconnect
|
|
* operation, in violation of the SCSI spec so we can safely
|
|
* ignore SAVE/RESTORE pointers calls.
|
|
*
|
|
* Unfortunately, some disks violate the SCSI spec and
|
|
* don't issue the required SAVE_POINTERS message before
|
|
* disconnecting, and we have to break spec to remain
|
|
* compatible.
|
|
*/
|
|
case SAVE_POINTERS:
|
|
case RESTORE_POINTERS:
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
break;
|
|
case EXTENDED_MESSAGE:
|
|
/*
|
|
* Extended messages are sent in the following format :
|
|
* Byte
|
|
* 0 EXTENDED_MESSAGE == 1
|
|
* 1 length (includes one byte for code, doesn't
|
|
* include first two bytes)
|
|
* 2 code
|
|
* 3..length+1 arguments
|
|
*
|
|
* Start the extended message buffer with the EXTENDED_MESSAGE
|
|
* byte, since spi_print_msg() wants the whole thing.
|
|
*/
|
|
extended_msg[0] = EXTENDED_MESSAGE;
|
|
/* Accept first byte by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no));
|
|
|
|
len = 2;
|
|
data = extended_msg + 1;
|
|
phase = PHASE_MSGIN;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
|
|
dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]));
|
|
|
|
if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) {
|
|
/* Accept third byte by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
len = extended_msg[1] - 1;
|
|
data = extended_msg + 3;
|
|
phase = PHASE_MSGIN;
|
|
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len));
|
|
|
|
switch (extended_msg[2]) {
|
|
case EXTENDED_SDTR:
|
|
case EXTENDED_WDTR:
|
|
case EXTENDED_MODIFY_DATA_POINTER:
|
|
case EXTENDED_EXTENDED_IDENTIFY:
|
|
tmp = 0;
|
|
}
|
|
} else if (len) {
|
|
printk("scsi%d: error receiving extended message\n", instance->host_no);
|
|
tmp = 0;
|
|
} else {
|
|
printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]);
|
|
tmp = 0;
|
|
}
|
|
/* Fall through to reject message */
|
|
|
|
/*
|
|
* If we get something weird that we aren't expecting,
|
|
* reject it.
|
|
*/
|
|
default:
|
|
if (!tmp) {
|
|
printk("scsi%d: rejecting message ", instance->host_no);
|
|
spi_print_msg(extended_msg);
|
|
printk("\n");
|
|
} else if (tmp != EXTENDED_MESSAGE)
|
|
scmd_printk(KERN_INFO, cmd,
|
|
"rejecting unknown message %02x\n",tmp);
|
|
else
|
|
scmd_printk(KERN_INFO, cmd,
|
|
"rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]);
|
|
|
|
msgout = MESSAGE_REJECT;
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
break;
|
|
} /* switch (tmp) */
|
|
break;
|
|
case PHASE_MSGOUT:
|
|
len = 1;
|
|
data = &msgout;
|
|
hostdata->last_message = msgout;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
if (msgout == ABORT) {
|
|
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
|
|
hostdata->connected = NULL;
|
|
cmd->result = DID_ERROR << 16;
|
|
collect_stats(hostdata, cmd);
|
|
cmd->scsi_done(cmd);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
return;
|
|
}
|
|
msgout = NOP;
|
|
break;
|
|
case PHASE_CMDOUT:
|
|
len = cmd->cmd_len;
|
|
data = cmd->cmnd;
|
|
/*
|
|
* XXX for performance reasons, on machines with a
|
|
* PSEUDO-DMA architecture we should probably
|
|
* use the dma transfer function.
|
|
*/
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) {
|
|
NCR5380_set_timer(hostdata, USLEEP_SLEEP);
|
|
dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
|
|
return;
|
|
}
|
|
break;
|
|
case PHASE_STATIN:
|
|
len = 1;
|
|
data = &tmp;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
cmd->SCp.Status = tmp;
|
|
break;
|
|
default:
|
|
printk("scsi%d : unknown phase\n", instance->host_no);
|
|
NCR5380_dprint(NDEBUG_ALL, instance);
|
|
} /* switch(phase) */
|
|
} /* if (tmp * SR_REQ) */
|
|
else {
|
|
/* RvC: go to sleep if polling time expired
|
|
*/
|
|
if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) {
|
|
NCR5380_set_timer(hostdata, USLEEP_SLEEP);
|
|
dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires));
|
|
return;
|
|
}
|
|
}
|
|
} /* while (1) */
|
|
}
|
|
|
|
/*
|
|
* Function : void NCR5380_reselect (struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : does reselection, initializing the instance->connected
|
|
* field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
|
|
* nexus has been reestablished,
|
|
*
|
|
* Inputs : instance - this instance of the NCR5380.
|
|
*
|
|
* Locks: io_request_lock held by caller if IRQ driven
|
|
*/
|
|
|
|
static void NCR5380_reselect(struct Scsi_Host *instance) {
|
|
NCR5380_local_declare();
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
|
|
instance->hostdata;
|
|
unsigned char target_mask;
|
|
unsigned char lun, phase;
|
|
int len;
|
|
unsigned char msg[3];
|
|
unsigned char *data;
|
|
Scsi_Cmnd *tmp = NULL, *prev;
|
|
int abort = 0;
|
|
NCR5380_setup(instance);
|
|
|
|
/*
|
|
* Disable arbitration, etc. since the host adapter obviously
|
|
* lost, and tell an interrupted NCR5380_select() to restart.
|
|
*/
|
|
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
hostdata->restart_select = 1;
|
|
|
|
target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
|
|
dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no));
|
|
|
|
/*
|
|
* At this point, we have detected that our SCSI ID is on the bus,
|
|
* SEL is true and BSY was false for at least one bus settle delay
|
|
* (400 ns).
|
|
*
|
|
* We must assert BSY ourselves, until the target drops the SEL
|
|
* signal.
|
|
*/
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
|
|
|
|
/* FIXME: timeout too long, must fail to workqueue */
|
|
if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0)
|
|
abort = 1;
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
/*
|
|
* Wait for target to go into MSGIN.
|
|
* FIXME: timeout needed and fail to work queeu
|
|
*/
|
|
|
|
if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ))
|
|
abort = 1;
|
|
|
|
len = 1;
|
|
data = msg;
|
|
phase = PHASE_MSGIN;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
|
|
if (!(msg[0] & 0x80)) {
|
|
printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no);
|
|
spi_print_msg(msg);
|
|
abort = 1;
|
|
} else {
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
lun = (msg[0] & 0x07);
|
|
|
|
/*
|
|
* We need to add code for SCSI-II to track which devices have
|
|
* I_T_L_Q nexuses established, and which have simple I_T_L
|
|
* nexuses so we can chose to do additional data transfer.
|
|
*/
|
|
|
|
/*
|
|
* Find the command corresponding to the I_T_L or I_T_L_Q nexus we
|
|
* just reestablished, and remove it from the disconnected queue.
|
|
*/
|
|
|
|
|
|
for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
|
|
if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
|
|
) {
|
|
if (prev) {
|
|
REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
|
|
prev->host_scribble = tmp->host_scribble;
|
|
} else {
|
|
REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
|
|
hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
|
|
}
|
|
tmp->host_scribble = NULL;
|
|
break;
|
|
}
|
|
if (!tmp) {
|
|
printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun);
|
|
/*
|
|
* Since we have an established nexus that we can't do anything with,
|
|
* we must abort it.
|
|
*/
|
|
abort = 1;
|
|
}
|
|
}
|
|
|
|
if (abort) {
|
|
do_abort(instance);
|
|
} else {
|
|
hostdata->connected = tmp;
|
|
dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : called by interrupt handler when DMA finishes or a phase
|
|
* mismatch occurs (which would finish the DMA transfer).
|
|
*
|
|
* Inputs : instance - this instance of the NCR5380.
|
|
*
|
|
* Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
|
|
* nexus has been reestablished, on failure NULL is returned.
|
|
*/
|
|
|
|
#ifdef REAL_DMA
|
|
static void NCR5380_dma_complete(NCR5380_instance * instance) {
|
|
NCR5380_local_declare();
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
int transferred;
|
|
NCR5380_setup(instance);
|
|
|
|
/*
|
|
* XXX this might not be right.
|
|
*
|
|
* Wait for final byte to transfer, ie wait for ACK to go false.
|
|
*
|
|
* We should use the Last Byte Sent bit, unfortunately this is
|
|
* not available on the 5380/5381 (only the various CMOS chips)
|
|
*
|
|
* FIXME: timeout, and need to handle long timeout/irq case
|
|
*/
|
|
|
|
NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
|
|
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
/*
|
|
* The only places we should see a phase mismatch and have to send
|
|
* data from the same set of pointers will be the data transfer
|
|
* phases. So, residual, requested length are only important here.
|
|
*/
|
|
|
|
if (!(hostdata->connected->SCp.phase & SR_CD)) {
|
|
transferred = instance->dmalen - NCR5380_dma_residual();
|
|
hostdata->connected->SCp.this_residual -= transferred;
|
|
hostdata->connected->SCp.ptr += transferred;
|
|
}
|
|
}
|
|
#endif /* def REAL_DMA */
|
|
|
|
/*
|
|
* Function : int NCR5380_abort (Scsi_Cmnd *cmd)
|
|
*
|
|
* Purpose : abort a command
|
|
*
|
|
* Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
|
|
* host byte of the result field to, if zero DID_ABORTED is
|
|
* used.
|
|
*
|
|
* Returns : 0 - success, -1 on failure.
|
|
*
|
|
* XXX - there is no way to abort the command that is currently
|
|
* connected, you have to wait for it to complete. If this is
|
|
* a problem, we could implement longjmp() / setjmp(), setjmp()
|
|
* called where the loop started in NCR5380_main().
|
|
*
|
|
* Locks: host lock taken by caller
|
|
*/
|
|
|
|
static int NCR5380_abort(Scsi_Cmnd * cmd) {
|
|
NCR5380_local_declare();
|
|
struct Scsi_Host *instance = cmd->device->host;
|
|
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
|
|
Scsi_Cmnd *tmp, **prev;
|
|
|
|
printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no);
|
|
scsi_print_command(cmd);
|
|
|
|
NCR5380_print_status(instance);
|
|
|
|
NCR5380_setup(instance);
|
|
|
|
dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no));
|
|
dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)));
|
|
|
|
#if 0
|
|
/*
|
|
* Case 1 : If the command is the currently executing command,
|
|
* we'll set the aborted flag and return control so that
|
|
* information transfer routine can exit cleanly.
|
|
*/
|
|
|
|
if (hostdata->connected == cmd) {
|
|
dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no));
|
|
hostdata->aborted = 1;
|
|
/*
|
|
* We should perform BSY checking, and make sure we haven't slipped
|
|
* into BUS FREE.
|
|
*/
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
|
|
/*
|
|
* Since we can't change phases until we've completed the current
|
|
* handshake, we have to source or sink a byte of data if the current
|
|
* phase is not MSGOUT.
|
|
*/
|
|
|
|
/*
|
|
* Return control to the executing NCR drive so we can clear the
|
|
* aborted flag and get back into our main loop.
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Case 2 : If the command hasn't been issued yet, we simply remove it
|
|
* from the issue queue.
|
|
*/
|
|
|
|
dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no));
|
|
for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
|
|
if (cmd == tmp) {
|
|
REMOVE(5, *prev, tmp, tmp->host_scribble);
|
|
(*prev) = (Scsi_Cmnd *) tmp->host_scribble;
|
|
tmp->host_scribble = NULL;
|
|
tmp->result = DID_ABORT << 16;
|
|
dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no));
|
|
tmp->scsi_done(tmp);
|
|
return SUCCESS;
|
|
}
|
|
#if (NDEBUG & NDEBUG_ABORT)
|
|
/* KLL */
|
|
else if (prev == tmp)
|
|
printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no);
|
|
#endif
|
|
|
|
/*
|
|
* Case 3 : If any commands are connected, we're going to fail the abort
|
|
* and let the high level SCSI driver retry at a later time or
|
|
* issue a reset.
|
|
*
|
|
* Timeouts, and therefore aborted commands, will be highly unlikely
|
|
* and handling them cleanly in this situation would make the common
|
|
* case of noresets less efficient, and would pollute our code. So,
|
|
* we fail.
|
|
*/
|
|
|
|
if (hostdata->connected) {
|
|
dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no));
|
|
return FAILED;
|
|
}
|
|
/*
|
|
* Case 4: If the command is currently disconnected from the bus, and
|
|
* there are no connected commands, we reconnect the I_T_L or
|
|
* I_T_L_Q nexus associated with it, go into message out, and send
|
|
* an abort message.
|
|
*
|
|
* This case is especially ugly. In order to reestablish the nexus, we
|
|
* need to call NCR5380_select(). The easiest way to implement this
|
|
* function was to abort if the bus was busy, and let the interrupt
|
|
* handler triggered on the SEL for reselect take care of lost arbitrations
|
|
* where necessary, meaning interrupts need to be enabled.
|
|
*
|
|
* When interrupts are enabled, the queues may change - so we
|
|
* can't remove it from the disconnected queue before selecting it
|
|
* because that could cause a failure in hashing the nexus if that
|
|
* device reselected.
|
|
*
|
|
* Since the queues may change, we can't use the pointers from when we
|
|
* first locate it.
|
|
*
|
|
* So, we must first locate the command, and if NCR5380_select()
|
|
* succeeds, then issue the abort, relocate the command and remove
|
|
* it from the disconnected queue.
|
|
*/
|
|
|
|
for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble)
|
|
if (cmd == tmp) {
|
|
dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no));
|
|
|
|
if (NCR5380_select(instance, cmd, (int) cmd->tag))
|
|
return FAILED;
|
|
dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no));
|
|
|
|
do_abort(instance);
|
|
|
|
for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble)
|
|
if (cmd == tmp) {
|
|
REMOVE(5, *prev, tmp, tmp->host_scribble);
|
|
*prev = (Scsi_Cmnd *) tmp->host_scribble;
|
|
tmp->host_scribble = NULL;
|
|
tmp->result = DID_ABORT << 16;
|
|
tmp->scsi_done(tmp);
|
|
return SUCCESS;
|
|
}
|
|
}
|
|
/*
|
|
* Case 5 : If we reached this point, the command was not found in any of
|
|
* the queues.
|
|
*
|
|
* We probably reached this point because of an unlikely race condition
|
|
* between the command completing successfully and the abortion code,
|
|
* so we won't panic, but we will notify the user in case something really
|
|
* broke.
|
|
*/
|
|
printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
|
|
" before abortion\n", instance->host_no);
|
|
return FAILED;
|
|
}
|
|
|
|
|
|
/*
|
|
* Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd)
|
|
*
|
|
* Purpose : reset the SCSI bus.
|
|
*
|
|
* Returns : SUCCESS
|
|
*
|
|
* Locks: host lock taken by caller
|
|
*/
|
|
|
|
static int NCR5380_bus_reset(Scsi_Cmnd * cmd)
|
|
{
|
|
struct Scsi_Host *instance = cmd->device->host;
|
|
|
|
NCR5380_local_declare();
|
|
NCR5380_setup(instance);
|
|
NCR5380_print_status(instance);
|
|
|
|
spin_lock_irq(instance->host_lock);
|
|
do_reset(instance);
|
|
spin_unlock_irq(instance->host_lock);
|
|
|
|
return SUCCESS;
|
|
}
|