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phoenix |
/* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by
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Sam Creasey. */
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/*
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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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* ++roman: To port the 5380 driver to the Atari, I had to do some changes in
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* this file, too:
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*
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* - Some of the debug statements were incorrect (undefined variables and the
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* like). I fixed that.
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*
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* - In information_transfer(), I think a #ifdef was wrong. Looking at the
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* possible DMA transfer size should also happen for REAL_DMA. I added this
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* in the #if statement.
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*
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* - When using real DMA, information_transfer() should return in a DATAOUT
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* phase after starting the DMA. It has nothing more to do.
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*
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* - The interrupt service routine should run main after end of DMA, too (not
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* only after RESELECTION interrupts). Additionally, it should _not_ test
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* for more interrupts after running main, since a DMA process may have
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* been started and interrupts are turned on now. The new int could happen
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* inside the execution of NCR5380_intr(), leading to recursive
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* calls.
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*
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* - I've added a function merge_contiguous_buffers() that tries to
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* merge scatter-gather buffers that are located at contiguous
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* physical addresses and can be processed with the same DMA setup.
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* Since most scatter-gather operations work on a page (4K) of
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* 4 buffers (1K), in more than 90% of all cases three interrupts and
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* DMA setup actions are saved.
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*
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* - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
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* and USLEEP, because these were messing up readability and will never be
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* needed for Atari SCSI.
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*
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* - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
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* stuff), and 'main' is executed in a bottom half if awoken by an
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* interrupt.
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*
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* - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
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* constructs. In my eyes, this made the source rather unreadable, so I
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* finally replaced that by the *_PRINTK() macros.
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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. 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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#if (NDEBUG & NDEBUG_LISTS)
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#define LIST(x,y) \
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{ printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
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if ((x)==(y)) udelay(5); }
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#define REMOVE(w,x,y,z) \
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{ printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
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(void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
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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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#endif
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/*
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* Design
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* Issues :
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*
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* The other Linux SCSI drivers were written when Linux was Intel PC-only,
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* and specifically for each board rather than each chip. This makes their
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* adaptation to platforms like the Mac (Some of which use NCR5380's)
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* more difficult than it has to be.
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*
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* Also, many of the SCSI drivers were written before the command queuing
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* routines were implemented, meaning their implementations of queued
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* commands were hacked on rather than designed in from the start.
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*
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* When I designed the Linux SCSI drivers I figured that
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* while having two different SCSI boards in a system might be useful
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* for debugging things, two of the same type wouldn't be used.
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* Well, I was wrong and a number of users have mailed me about running
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* multiple high-performance SCSI boards in a server.
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*
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* Finally, when I get questions from users, I have no idea what
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* revision of my driver they are running.
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*
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* This driver attempts to address these problems :
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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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* 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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* To solve the multiple-boards-in-the-same-system problem,
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* there is a separate instance structure for each instance
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* of a 5380 in the system. So, multiple NCR5380 drivers will
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* be able to coexist with appropriate changes to the high level
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* SCSI code.
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*
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* A NCR5380_PUBLIC_REVISION macro is provided, with the release
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* number (updated for each public release) printed by the
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* NCR5380_print_options command, which should be called from the
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* wrapper detect function, so that I know what release of the driver
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* users are using.
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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 when not running by the interrupt handler,
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* timer, and queue command function. It attempts to establish
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* I_T_L or I_T_L_Q nexuses by removing the commands from the
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* issue queue and calling NCR5380_select() if a nexus
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* 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 USLEEP
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* was defined, and the target is idle for too long, the system
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* 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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* 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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* LINKED - if defined, linked commands are supported.
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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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* SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
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*
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* These macros MUST be defined :
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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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* 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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* If nothing specific to this implementation needs doing (ie, with external
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* hardware), you must also define
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*
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* NCR5380_queue_command
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* NCR5380_reset
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* NCR5380_abort
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* NCR5380_proc_info
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*
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* to be the global entry points into the specific driver, ie
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* #define NCR5380_queue_command t128_queue_command.
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*
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* If this is not done, the routines will be defined as static functions
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* with the NCR5380* names and the user must provide a globally
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* accessible wrapper function.
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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. Before the specific driver initialization
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* code finishes, NCR5380_print_options should be called.
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*/
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static struct Scsi_Host *first_instance = NULL;
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static Scsi_Host_Template *the_template = NULL;
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/* Macros ease life... :-) */
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#define SETUP_HOSTDATA(in) \
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struct NCR5380_hostdata *hostdata = \
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(struct NCR5380_hostdata *)(in)->hostdata
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#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
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#define NEXT(cmd) ((Scsi_Cmnd *)((cmd)->host_scribble))
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#define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble))
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#define HOSTNO instance->host_no
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#define H_NO(cmd) (cmd)->host->host_no
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#ifdef SUPPORT_TAGS
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/*
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* Functions for handling tagged queuing
|
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* =====================================
|
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*
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* ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
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*
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* Using consecutive numbers for the tags is no good idea in my eyes. There
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* could be wrong re-usings if the counter (8 bit!) wraps and some early
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* command has been preempted for a long time. My solution: a bitfield for
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* remembering used tags.
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*
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* There's also the problem that each target has a certain queue size, but we
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* cannot know it in advance :-( We just see a QUEUE_FULL status being
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* returned. So, in this case, the driver internal queue size assumption is
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* reduced to the number of active tags if QUEUE_FULL is returned by the
|
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* target. The command is returned to the mid-level, but with status changed
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* to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
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* correctly.
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*
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* We're also not allowed running tagged commands as long as an untagged
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* command is active. And REQUEST SENSE commands after a contingent allegiance
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* condition _must_ be untagged. To keep track whether an untagged command has
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297 |
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* been issued, the host->busy array is still employed, as it is without
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298 |
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* support for tagged queuing.
|
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*
|
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* One could suspect that there are possible race conditions between
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301 |
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* is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
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* case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
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* which already guaranteed to be running at most once. It is also the only
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* place where tags/LUNs are allocated. So no other allocation can slip
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* between that pair, there could only happen a reselection, which can free a
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* tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
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* important: the tag bit must be cleared before 'nr_allocated' is decreased.
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*/
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309 |
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/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
|
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#undef TAG_NONE
|
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#define TAG_NONE 0xff
|
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|
314 |
|
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/* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
|
315 |
|
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#if (MAX_TAGS % 32) != 0
|
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|
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#error "MAX_TAGS must be a multiple of 32!"
|
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|
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#endif
|
318 |
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|
319 |
|
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typedef struct {
|
320 |
|
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char allocated[MAX_TAGS/8];
|
321 |
|
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int nr_allocated;
|
322 |
|
|
int queue_size;
|
323 |
|
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} TAG_ALLOC;
|
324 |
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|
325 |
|
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static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
|
326 |
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|
327 |
|
|
|
328 |
|
|
static void __init init_tags( void )
|
329 |
|
|
{
|
330 |
|
|
int target, lun;
|
331 |
|
|
TAG_ALLOC *ta;
|
332 |
|
|
|
333 |
|
|
if (!setup_use_tagged_queuing)
|
334 |
|
|
return;
|
335 |
|
|
|
336 |
|
|
for( target = 0; target < 8; ++target ) {
|
337 |
|
|
for( lun = 0; lun < 8; ++lun ) {
|
338 |
|
|
ta = &TagAlloc[target][lun];
|
339 |
|
|
memset( &ta->allocated, 0, MAX_TAGS/8 );
|
340 |
|
|
ta->nr_allocated = 0;
|
341 |
|
|
/* At the beginning, assume the maximum queue size we could
|
342 |
|
|
* support (MAX_TAGS). This value will be decreased if the target
|
343 |
|
|
* returns QUEUE_FULL status.
|
344 |
|
|
*/
|
345 |
|
|
ta->queue_size = MAX_TAGS;
|
346 |
|
|
}
|
347 |
|
|
}
|
348 |
|
|
}
|
349 |
|
|
|
350 |
|
|
|
351 |
|
|
/* Check if we can issue a command to this LUN: First see if the LUN is marked
|
352 |
|
|
* busy by an untagged command. If the command should use tagged queuing, also
|
353 |
|
|
* check that there is a free tag and the target's queue won't overflow. This
|
354 |
|
|
* function should be called with interrupts disabled to avoid race
|
355 |
|
|
* conditions.
|
356 |
|
|
*/
|
357 |
|
|
|
358 |
|
|
static int is_lun_busy( Scsi_Cmnd *cmd, int should_be_tagged )
|
359 |
|
|
{
|
360 |
|
|
SETUP_HOSTDATA(cmd->host);
|
361 |
|
|
|
362 |
|
|
if (hostdata->busy[cmd->target] & (1 << cmd->lun))
|
363 |
|
|
return( 1 );
|
364 |
|
|
if (!should_be_tagged ||
|
365 |
|
|
!setup_use_tagged_queuing || !cmd->device->tagged_supported)
|
366 |
|
|
return( 0 );
|
367 |
|
|
if (TagAlloc[cmd->target][cmd->lun].nr_allocated >=
|
368 |
|
|
TagAlloc[cmd->target][cmd->lun].queue_size ) {
|
369 |
|
|
TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
|
370 |
|
|
H_NO(cmd), cmd->target, cmd->lun );
|
371 |
|
|
return( 1 );
|
372 |
|
|
}
|
373 |
|
|
return( 0 );
|
374 |
|
|
}
|
375 |
|
|
|
376 |
|
|
|
377 |
|
|
/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
|
378 |
|
|
* must be called before!), or reserve the LUN in 'busy' if the command is
|
379 |
|
|
* untagged.
|
380 |
|
|
*/
|
381 |
|
|
|
382 |
|
|
static void cmd_get_tag( Scsi_Cmnd *cmd, int should_be_tagged )
|
383 |
|
|
{
|
384 |
|
|
SETUP_HOSTDATA(cmd->host);
|
385 |
|
|
|
386 |
|
|
/* If we or the target don't support tagged queuing, allocate the LUN for
|
387 |
|
|
* an untagged command.
|
388 |
|
|
*/
|
389 |
|
|
if (!should_be_tagged ||
|
390 |
|
|
!setup_use_tagged_queuing || !cmd->device->tagged_supported) {
|
391 |
|
|
cmd->tag = TAG_NONE;
|
392 |
|
|
hostdata->busy[cmd->target] |= (1 << cmd->lun);
|
393 |
|
|
TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
|
394 |
|
|
"command\n", H_NO(cmd), cmd->target, cmd->lun );
|
395 |
|
|
}
|
396 |
|
|
else {
|
397 |
|
|
TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
|
398 |
|
|
|
399 |
|
|
cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
|
400 |
|
|
set_bit( cmd->tag, &ta->allocated );
|
401 |
|
|
ta->nr_allocated++;
|
402 |
|
|
TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
|
403 |
|
|
"(now %d tags in use)\n",
|
404 |
|
|
H_NO(cmd), cmd->tag, cmd->target, cmd->lun,
|
405 |
|
|
ta->nr_allocated );
|
406 |
|
|
}
|
407 |
|
|
}
|
408 |
|
|
|
409 |
|
|
|
410 |
|
|
/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
|
411 |
|
|
* unlock the LUN.
|
412 |
|
|
*/
|
413 |
|
|
|
414 |
|
|
static void cmd_free_tag( Scsi_Cmnd *cmd )
|
415 |
|
|
{
|
416 |
|
|
SETUP_HOSTDATA(cmd->host);
|
417 |
|
|
|
418 |
|
|
if (cmd->tag == TAG_NONE) {
|
419 |
|
|
hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
|
420 |
|
|
TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
|
421 |
|
|
H_NO(cmd), cmd->target, cmd->lun );
|
422 |
|
|
}
|
423 |
|
|
else if (cmd->tag >= MAX_TAGS) {
|
424 |
|
|
printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
|
425 |
|
|
H_NO(cmd), cmd->tag );
|
426 |
|
|
}
|
427 |
|
|
else {
|
428 |
|
|
TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
|
429 |
|
|
clear_bit( cmd->tag, &ta->allocated );
|
430 |
|
|
ta->nr_allocated--;
|
431 |
|
|
TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
|
432 |
|
|
H_NO(cmd), cmd->tag, cmd->target, cmd->lun );
|
433 |
|
|
}
|
434 |
|
|
}
|
435 |
|
|
|
436 |
|
|
|
437 |
|
|
static void free_all_tags( void )
|
438 |
|
|
{
|
439 |
|
|
int target, lun;
|
440 |
|
|
TAG_ALLOC *ta;
|
441 |
|
|
|
442 |
|
|
if (!setup_use_tagged_queuing)
|
443 |
|
|
return;
|
444 |
|
|
|
445 |
|
|
for( target = 0; target < 8; ++target ) {
|
446 |
|
|
for( lun = 0; lun < 8; ++lun ) {
|
447 |
|
|
ta = &TagAlloc[target][lun];
|
448 |
|
|
memset( &ta->allocated, 0, MAX_TAGS/8 );
|
449 |
|
|
ta->nr_allocated = 0;
|
450 |
|
|
}
|
451 |
|
|
}
|
452 |
|
|
}
|
453 |
|
|
|
454 |
|
|
#endif /* SUPPORT_TAGS */
|
455 |
|
|
|
456 |
|
|
|
457 |
|
|
/*
|
458 |
|
|
* Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
|
459 |
|
|
*
|
460 |
|
|
* Purpose: Try to merge several scatter-gather requests into one DMA
|
461 |
|
|
* transfer. This is possible if the scatter buffers lie on
|
462 |
|
|
* physical contiguous addresses.
|
463 |
|
|
*
|
464 |
|
|
* Parameters: Scsi_Cmnd *cmd
|
465 |
|
|
* The command to work on. The first scatter buffer's data are
|
466 |
|
|
* assumed to be already transfered into ptr/this_residual.
|
467 |
|
|
*/
|
468 |
|
|
|
469 |
|
|
static void merge_contiguous_buffers( Scsi_Cmnd *cmd )
|
470 |
|
|
{
|
471 |
|
|
unsigned long endaddr;
|
472 |
|
|
#if (NDEBUG & NDEBUG_MERGING)
|
473 |
|
|
unsigned long oldlen = cmd->SCp.this_residual;
|
474 |
|
|
int cnt = 1;
|
475 |
|
|
#endif
|
476 |
|
|
|
477 |
|
|
for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
|
478 |
|
|
cmd->SCp.buffers_residual &&
|
479 |
|
|
virt_to_phys(cmd->SCp.buffer[1].address) == endaddr; ) {
|
480 |
|
|
|
481 |
|
|
MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
|
482 |
|
|
cmd->SCp.buffer[1].address, endaddr);
|
483 |
|
|
#if (NDEBUG & NDEBUG_MERGING)
|
484 |
|
|
++cnt;
|
485 |
|
|
#endif
|
486 |
|
|
++cmd->SCp.buffer;
|
487 |
|
|
--cmd->SCp.buffers_residual;
|
488 |
|
|
cmd->SCp.this_residual += cmd->SCp.buffer->length;
|
489 |
|
|
endaddr += cmd->SCp.buffer->length;
|
490 |
|
|
}
|
491 |
|
|
#if (NDEBUG & NDEBUG_MERGING)
|
492 |
|
|
if (oldlen != cmd->SCp.this_residual)
|
493 |
|
|
MER_PRINTK("merged %d buffers from %p, new length %08x\n",
|
494 |
|
|
cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
|
495 |
|
|
#endif
|
496 |
|
|
}
|
497 |
|
|
|
498 |
|
|
/*
|
499 |
|
|
* Function : void initialize_SCp(Scsi_Cmnd *cmd)
|
500 |
|
|
*
|
501 |
|
|
* Purpose : initialize the saved data pointers for cmd to point to the
|
502 |
|
|
* start of the buffer.
|
503 |
|
|
*
|
504 |
|
|
* Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
|
505 |
|
|
*/
|
506 |
|
|
|
507 |
|
|
static __inline__ void initialize_SCp(Scsi_Cmnd *cmd)
|
508 |
|
|
{
|
509 |
|
|
/*
|
510 |
|
|
* Initialize the Scsi Pointer field so that all of the commands in the
|
511 |
|
|
* various queues are valid.
|
512 |
|
|
*/
|
513 |
|
|
|
514 |
|
|
if (cmd->use_sg) {
|
515 |
|
|
cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
|
516 |
|
|
cmd->SCp.buffers_residual = cmd->use_sg - 1;
|
517 |
|
|
cmd->SCp.ptr = (char *) cmd->SCp.buffer->address;
|
518 |
|
|
cmd->SCp.this_residual = cmd->SCp.buffer->length;
|
519 |
|
|
/* ++roman: Try to merge some scatter-buffers if they are at
|
520 |
|
|
* contiguous physical addresses.
|
521 |
|
|
*/
|
522 |
|
|
merge_contiguous_buffers( cmd );
|
523 |
|
|
} else {
|
524 |
|
|
cmd->SCp.buffer = NULL;
|
525 |
|
|
cmd->SCp.buffers_residual = 0;
|
526 |
|
|
cmd->SCp.ptr = (char *) cmd->request_buffer;
|
527 |
|
|
cmd->SCp.this_residual = cmd->request_bufflen;
|
528 |
|
|
}
|
529 |
|
|
|
530 |
|
|
}
|
531 |
|
|
|
532 |
|
|
#include <linux/config.h>
|
533 |
|
|
#include <linux/delay.h>
|
534 |
|
|
|
535 |
|
|
#if 1
|
536 |
|
|
static struct {
|
537 |
|
|
unsigned char mask;
|
538 |
|
|
const char * name;}
|
539 |
|
|
signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
|
540 |
|
|
{ SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
|
541 |
|
|
{ SR_SEL, "SEL" }, {0, NULL}},
|
542 |
|
|
basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
|
543 |
|
|
icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
|
544 |
|
|
{ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
|
545 |
|
|
{ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
|
546 |
|
|
{0, NULL}},
|
547 |
|
|
mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
|
548 |
|
|
{MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
|
549 |
|
|
"MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
|
550 |
|
|
{MR_MONITOR_BSY, "MODE MONITOR BSY"},
|
551 |
|
|
{MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
|
552 |
|
|
{0, NULL}};
|
553 |
|
|
|
554 |
|
|
/*
|
555 |
|
|
* Function : void NCR5380_print(struct Scsi_Host *instance)
|
556 |
|
|
*
|
557 |
|
|
* Purpose : print the SCSI bus signals for debugging purposes
|
558 |
|
|
*
|
559 |
|
|
* Input : instance - which NCR5380
|
560 |
|
|
*/
|
561 |
|
|
|
562 |
|
|
static void NCR5380_print(struct Scsi_Host *instance) {
|
563 |
|
|
unsigned char status, data, basr, mr, icr, i;
|
564 |
|
|
unsigned long flags;
|
565 |
|
|
|
566 |
|
|
save_flags(flags);
|
567 |
|
|
cli();
|
568 |
|
|
data = NCR5380_read(CURRENT_SCSI_DATA_REG);
|
569 |
|
|
status = NCR5380_read(STATUS_REG);
|
570 |
|
|
mr = NCR5380_read(MODE_REG);
|
571 |
|
|
icr = NCR5380_read(INITIATOR_COMMAND_REG);
|
572 |
|
|
basr = NCR5380_read(BUS_AND_STATUS_REG);
|
573 |
|
|
restore_flags(flags);
|
574 |
|
|
printk("STATUS_REG: %02x ", status);
|
575 |
|
|
for (i = 0; signals[i].mask ; ++i)
|
576 |
|
|
if (status & signals[i].mask)
|
577 |
|
|
printk(",%s", signals[i].name);
|
578 |
|
|
printk("\nBASR: %02x ", basr);
|
579 |
|
|
for (i = 0; basrs[i].mask ; ++i)
|
580 |
|
|
if (basr & basrs[i].mask)
|
581 |
|
|
printk(",%s", basrs[i].name);
|
582 |
|
|
printk("\nICR: %02x ", icr);
|
583 |
|
|
for (i = 0; icrs[i].mask; ++i)
|
584 |
|
|
if (icr & icrs[i].mask)
|
585 |
|
|
printk(",%s", icrs[i].name);
|
586 |
|
|
printk("\nMODE: %02x ", mr);
|
587 |
|
|
for (i = 0; mrs[i].mask; ++i)
|
588 |
|
|
if (mr & mrs[i].mask)
|
589 |
|
|
printk(",%s", mrs[i].name);
|
590 |
|
|
printk("\n");
|
591 |
|
|
}
|
592 |
|
|
|
593 |
|
|
static struct {
|
594 |
|
|
unsigned char value;
|
595 |
|
|
const char *name;
|
596 |
|
|
} phases[] = {
|
597 |
|
|
{PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
|
598 |
|
|
{PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
|
599 |
|
|
{PHASE_UNKNOWN, "UNKNOWN"}};
|
600 |
|
|
|
601 |
|
|
/*
|
602 |
|
|
* Function : void NCR5380_print_phase(struct Scsi_Host *instance)
|
603 |
|
|
*
|
604 |
|
|
* Purpose : print the current SCSI phase for debugging purposes
|
605 |
|
|
*
|
606 |
|
|
* Input : instance - which NCR5380
|
607 |
|
|
*/
|
608 |
|
|
|
609 |
|
|
static void NCR5380_print_phase(struct Scsi_Host *instance)
|
610 |
|
|
{
|
611 |
|
|
unsigned char status;
|
612 |
|
|
int i;
|
613 |
|
|
|
614 |
|
|
status = NCR5380_read(STATUS_REG);
|
615 |
|
|
if (!(status & SR_REQ))
|
616 |
|
|
printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
|
617 |
|
|
else {
|
618 |
|
|
for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
|
619 |
|
|
(phases[i].value != (status & PHASE_MASK)); ++i);
|
620 |
|
|
printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
|
621 |
|
|
}
|
622 |
|
|
}
|
623 |
|
|
|
624 |
|
|
#else /* !NDEBUG */
|
625 |
|
|
|
626 |
|
|
/* dummies... */
|
627 |
|
|
__inline__ void NCR5380_print(struct Scsi_Host *instance) { };
|
628 |
|
|
__inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
|
629 |
|
|
|
630 |
|
|
#endif
|
631 |
|
|
|
632 |
|
|
/*
|
633 |
|
|
* ++roman: New scheme of calling NCR5380_main()
|
634 |
|
|
*
|
635 |
|
|
* If we're not in an interrupt, we can call our main directly, it cannot be
|
636 |
|
|
* already running. Else, we queue it on a task queue, if not 'main_running'
|
637 |
|
|
* tells us that a lower level is already executing it. This way,
|
638 |
|
|
* 'main_running' needs not be protected in a special way.
|
639 |
|
|
*
|
640 |
|
|
* queue_main() is a utility function for putting our main onto the task
|
641 |
|
|
* queue, if main_running is false. It should be called only from a
|
642 |
|
|
* interrupt or bottom half.
|
643 |
|
|
*/
|
644 |
|
|
|
645 |
|
|
#include <linux/tqueue.h>
|
646 |
|
|
#include <linux/interrupt.h>
|
647 |
|
|
|
648 |
|
|
static volatile int main_running = 0;
|
649 |
|
|
static struct tq_struct NCR5380_tqueue = {
|
650 |
|
|
routine: (void (*)(void*))NCR5380_main /* must have (void *) arg... */
|
651 |
|
|
};
|
652 |
|
|
|
653 |
|
|
static __inline__ void queue_main(void)
|
654 |
|
|
{
|
655 |
|
|
if (!main_running) {
|
656 |
|
|
/* If in interrupt and NCR5380_main() not already running,
|
657 |
|
|
queue it on the 'immediate' task queue, to be processed
|
658 |
|
|
immediately after the current interrupt processing has
|
659 |
|
|
finished. */
|
660 |
|
|
queue_task(&NCR5380_tqueue, &tq_immediate);
|
661 |
|
|
mark_bh(IMMEDIATE_BH);
|
662 |
|
|
}
|
663 |
|
|
/* else: nothing to do: the running NCR5380_main() will pick up
|
664 |
|
|
any newly queued command. */
|
665 |
|
|
}
|
666 |
|
|
|
667 |
|
|
|
668 |
|
|
static inline void NCR5380_all_init (void)
|
669 |
|
|
{
|
670 |
|
|
static int done = 0;
|
671 |
|
|
if (!done) {
|
672 |
|
|
INI_PRINTK("scsi : NCR5380_all_init()\n");
|
673 |
|
|
done = 1;
|
674 |
|
|
}
|
675 |
|
|
}
|
676 |
|
|
|
677 |
|
|
|
678 |
|
|
/*
|
679 |
|
|
* Function : void NCR58380_print_options (struct Scsi_Host *instance)
|
680 |
|
|
*
|
681 |
|
|
* Purpose : called by probe code indicating the NCR5380 driver
|
682 |
|
|
* options that were selected.
|
683 |
|
|
*
|
684 |
|
|
* Inputs : instance, pointer to this instance. Unused.
|
685 |
|
|
*/
|
686 |
|
|
|
687 |
|
|
static void __init NCR5380_print_options (struct Scsi_Host *instance)
|
688 |
|
|
{
|
689 |
|
|
printk(" generic options"
|
690 |
|
|
#ifdef AUTOSENSE
|
691 |
|
|
" AUTOSENSE"
|
692 |
|
|
#endif
|
693 |
|
|
#ifdef REAL_DMA
|
694 |
|
|
" REAL DMA"
|
695 |
|
|
#endif
|
696 |
|
|
#ifdef PARITY
|
697 |
|
|
" PARITY"
|
698 |
|
|
#endif
|
699 |
|
|
#ifdef SUPPORT_TAGS
|
700 |
|
|
" SCSI-2 TAGGED QUEUING"
|
701 |
|
|
#endif
|
702 |
|
|
);
|
703 |
|
|
printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
|
704 |
|
|
}
|
705 |
|
|
|
706 |
|
|
/*
|
707 |
|
|
* Function : void NCR5380_print_status (struct Scsi_Host *instance)
|
708 |
|
|
*
|
709 |
|
|
* Purpose : print commands in the various queues, called from
|
710 |
|
|
* NCR5380_abort and NCR5380_debug to aid debugging.
|
711 |
|
|
*
|
712 |
|
|
* Inputs : instance, pointer to this instance.
|
713 |
|
|
*/
|
714 |
|
|
|
715 |
|
|
static void NCR5380_print_status (struct Scsi_Host *instance)
|
716 |
|
|
{
|
717 |
|
|
char *pr_bfr;
|
718 |
|
|
char *start;
|
719 |
|
|
int len;
|
720 |
|
|
|
721 |
|
|
NCR_PRINT(NDEBUG_ANY);
|
722 |
|
|
NCR_PRINT_PHASE(NDEBUG_ANY);
|
723 |
|
|
|
724 |
|
|
pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
|
725 |
|
|
if (!pr_bfr) {
|
726 |
|
|
printk("NCR5380_print_status: no memory for print buffer\n");
|
727 |
|
|
return;
|
728 |
|
|
}
|
729 |
|
|
len = NCR5380_proc_info(pr_bfr, &start, 0, PAGE_SIZE, HOSTNO, 0);
|
730 |
|
|
pr_bfr[len] = 0;
|
731 |
|
|
printk("\n%s\n", pr_bfr);
|
732 |
|
|
free_page((unsigned long) pr_bfr);
|
733 |
|
|
}
|
734 |
|
|
|
735 |
|
|
|
736 |
|
|
/******************************************/
|
737 |
|
|
/*
|
738 |
|
|
* /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
|
739 |
|
|
*
|
740 |
|
|
* *buffer: I/O buffer
|
741 |
|
|
* **start: if inout == FALSE pointer into buffer where user read should start
|
742 |
|
|
* offset: current offset
|
743 |
|
|
* length: length of buffer
|
744 |
|
|
* hostno: Scsi_Host host_no
|
745 |
|
|
* inout: TRUE - user is writing; FALSE - user is reading
|
746 |
|
|
*
|
747 |
|
|
* Return the number of bytes read from or written
|
748 |
|
|
*/
|
749 |
|
|
|
750 |
|
|
#undef SPRINTF
|
751 |
|
|
#define SPRINTF(fmt,args...) \
|
752 |
|
|
do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
|
753 |
|
|
pos += sprintf(pos, fmt , ## args); } while(0)
|
754 |
|
|
static
|
755 |
|
|
char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
|
756 |
|
|
|
757 |
|
|
static int NCR5380_proc_info (char *buffer, char **start, off_t offset,
|
758 |
|
|
int length, int hostno, int inout)
|
759 |
|
|
{
|
760 |
|
|
char *pos = buffer;
|
761 |
|
|
struct Scsi_Host *instance;
|
762 |
|
|
struct NCR5380_hostdata *hostdata;
|
763 |
|
|
Scsi_Cmnd *ptr;
|
764 |
|
|
unsigned long flags;
|
765 |
|
|
off_t begin = 0;
|
766 |
|
|
#define check_offset() \
|
767 |
|
|
do { \
|
768 |
|
|
if (pos - buffer < offset - begin) { \
|
769 |
|
|
begin += pos - buffer; \
|
770 |
|
|
pos = buffer; \
|
771 |
|
|
} \
|
772 |
|
|
} while (0)
|
773 |
|
|
|
774 |
|
|
for (instance = first_instance; instance && HOSTNO != hostno;
|
775 |
|
|
instance = instance->next)
|
776 |
|
|
;
|
777 |
|
|
if (!instance)
|
778 |
|
|
return(-ESRCH);
|
779 |
|
|
hostdata = (struct NCR5380_hostdata *)instance->hostdata;
|
780 |
|
|
|
781 |
|
|
if (inout) { /* Has data been written to the file ? */
|
782 |
|
|
return(-ENOSYS); /* Currently this is a no-op */
|
783 |
|
|
}
|
784 |
|
|
SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
|
785 |
|
|
check_offset();
|
786 |
|
|
save_flags(flags);
|
787 |
|
|
cli();
|
788 |
|
|
SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
|
789 |
|
|
check_offset();
|
790 |
|
|
if (!hostdata->connected)
|
791 |
|
|
SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
|
792 |
|
|
else
|
793 |
|
|
pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected,
|
794 |
|
|
pos, buffer, length);
|
795 |
|
|
SPRINTF("scsi%d: issue_queue\n", HOSTNO);
|
796 |
|
|
check_offset();
|
797 |
|
|
for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
|
798 |
|
|
pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
|
799 |
|
|
check_offset();
|
800 |
|
|
}
|
801 |
|
|
|
802 |
|
|
SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
|
803 |
|
|
check_offset();
|
804 |
|
|
for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
|
805 |
|
|
ptr = NEXT(ptr)) {
|
806 |
|
|
pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
|
807 |
|
|
check_offset();
|
808 |
|
|
}
|
809 |
|
|
|
810 |
|
|
restore_flags(flags);
|
811 |
|
|
*start = buffer + (offset - begin);
|
812 |
|
|
if (pos - buffer < offset - begin)
|
813 |
|
|
return 0;
|
814 |
|
|
else if (pos - buffer - (offset - begin) < length)
|
815 |
|
|
return pos - buffer - (offset - begin);
|
816 |
|
|
return length;
|
817 |
|
|
}
|
818 |
|
|
|
819 |
|
|
static char *
|
820 |
|
|
lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
|
821 |
|
|
{
|
822 |
|
|
int i, s;
|
823 |
|
|
unsigned char *command;
|
824 |
|
|
SPRINTF("scsi%d: destination target %d, lun %d\n",
|
825 |
|
|
H_NO(cmd), cmd->target, cmd->lun);
|
826 |
|
|
SPRINTF(" command = ");
|
827 |
|
|
command = cmd->cmnd;
|
828 |
|
|
SPRINTF("%2d (0x%02x)", command[0], command[0]);
|
829 |
|
|
for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
|
830 |
|
|
SPRINTF(" %02x", command[i]);
|
831 |
|
|
SPRINTF("\n");
|
832 |
|
|
return pos;
|
833 |
|
|
}
|
834 |
|
|
|
835 |
|
|
|
836 |
|
|
/*
|
837 |
|
|
* Function : void NCR5380_init (struct Scsi_Host *instance)
|
838 |
|
|
*
|
839 |
|
|
* Purpose : initializes *instance and corresponding 5380 chip.
|
840 |
|
|
*
|
841 |
|
|
* Inputs : instance - instantiation of the 5380 driver.
|
842 |
|
|
*
|
843 |
|
|
* Notes : I assume that the host, hostno, and id bits have been
|
844 |
|
|
* set correctly. I don't care about the irq and other fields.
|
845 |
|
|
*
|
846 |
|
|
*/
|
847 |
|
|
|
848 |
|
|
static void __init NCR5380_init (struct Scsi_Host *instance, int flags)
|
849 |
|
|
{
|
850 |
|
|
int i;
|
851 |
|
|
SETUP_HOSTDATA(instance);
|
852 |
|
|
|
853 |
|
|
NCR5380_all_init();
|
854 |
|
|
|
855 |
|
|
hostdata->aborted = 0;
|
856 |
|
|
hostdata->id_mask = 1 << instance->this_id;
|
857 |
|
|
hostdata->id_higher_mask = 0;
|
858 |
|
|
for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
|
859 |
|
|
if (i > hostdata->id_mask)
|
860 |
|
|
hostdata->id_higher_mask |= i;
|
861 |
|
|
for (i = 0; i < 8; ++i)
|
862 |
|
|
hostdata->busy[i] = 0;
|
863 |
|
|
#ifdef SUPPORT_TAGS
|
864 |
|
|
init_tags();
|
865 |
|
|
#endif
|
866 |
|
|
#if defined (REAL_DMA)
|
867 |
|
|
hostdata->dma_len = 0;
|
868 |
|
|
#endif
|
869 |
|
|
hostdata->targets_present = 0;
|
870 |
|
|
hostdata->connected = NULL;
|
871 |
|
|
hostdata->issue_queue = NULL;
|
872 |
|
|
hostdata->disconnected_queue = NULL;
|
873 |
|
|
hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
|
874 |
|
|
|
875 |
|
|
if (!the_template) {
|
876 |
|
|
the_template = instance->hostt;
|
877 |
|
|
first_instance = instance;
|
878 |
|
|
}
|
879 |
|
|
|
880 |
|
|
|
881 |
|
|
#ifndef AUTOSENSE
|
882 |
|
|
if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
|
883 |
|
|
printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
|
884 |
|
|
" without AUTOSENSE option, contingent allegiance conditions may\n"
|
885 |
|
|
" be incorrectly cleared.\n", HOSTNO);
|
886 |
|
|
#endif /* def AUTOSENSE */
|
887 |
|
|
|
888 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
889 |
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
890 |
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
891 |
|
|
NCR5380_write(SELECT_ENABLE_REG, 0);
|
892 |
|
|
}
|
893 |
|
|
|
894 |
|
|
/*
|
895 |
|
|
* Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
|
896 |
|
|
* void (*done)(Scsi_Cmnd *))
|
897 |
|
|
*
|
898 |
|
|
* Purpose : enqueues a SCSI command
|
899 |
|
|
*
|
900 |
|
|
* Inputs : cmd - SCSI command, done - function called on completion, with
|
901 |
|
|
* a pointer to the command descriptor.
|
902 |
|
|
*
|
903 |
|
|
* Returns : 0
|
904 |
|
|
*
|
905 |
|
|
* Side effects :
|
906 |
|
|
* cmd is added to the per instance issue_queue, with minor
|
907 |
|
|
* twiddling done to the host specific fields of cmd. If the
|
908 |
|
|
* main coroutine is not running, it is restarted.
|
909 |
|
|
*
|
910 |
|
|
*/
|
911 |
|
|
|
912 |
|
|
/* Only make static if a wrapper function is used */
|
913 |
|
|
static int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
|
914 |
|
|
{
|
915 |
|
|
SETUP_HOSTDATA(cmd->host);
|
916 |
|
|
Scsi_Cmnd *tmp;
|
917 |
|
|
unsigned long flags;
|
918 |
|
|
extern int update_timeout(Scsi_Cmnd * SCset, int timeout);
|
919 |
|
|
|
920 |
|
|
#if (NDEBUG & NDEBUG_NO_WRITE)
|
921 |
|
|
switch (cmd->cmnd[0]) {
|
922 |
|
|
case WRITE_6:
|
923 |
|
|
case WRITE_10:
|
924 |
|
|
printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
|
925 |
|
|
H_NO(cmd));
|
926 |
|
|
cmd->result = (DID_ERROR << 16);
|
927 |
|
|
done(cmd);
|
928 |
|
|
return 0;
|
929 |
|
|
}
|
930 |
|
|
#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
|
931 |
|
|
|
932 |
|
|
|
933 |
|
|
#ifdef NCR5380_STATS
|
934 |
|
|
# if 0
|
935 |
|
|
if (!hostdata->connected && !hostdata->issue_queue &&
|
936 |
|
|
!hostdata->disconnected_queue) {
|
937 |
|
|
hostdata->timebase = jiffies;
|
938 |
|
|
}
|
939 |
|
|
# endif
|
940 |
|
|
# ifdef NCR5380_STAT_LIMIT
|
941 |
|
|
if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
|
942 |
|
|
# endif
|
943 |
|
|
switch (cmd->cmnd[0])
|
944 |
|
|
{
|
945 |
|
|
case WRITE:
|
946 |
|
|
case WRITE_6:
|
947 |
|
|
case WRITE_10:
|
948 |
|
|
hostdata->time_write[cmd->target] -= (jiffies - hostdata->timebase);
|
949 |
|
|
hostdata->bytes_write[cmd->target] += cmd->request_bufflen;
|
950 |
|
|
hostdata->pendingw++;
|
951 |
|
|
break;
|
952 |
|
|
case READ:
|
953 |
|
|
case READ_6:
|
954 |
|
|
case READ_10:
|
955 |
|
|
hostdata->time_read[cmd->target] -= (jiffies - hostdata->timebase);
|
956 |
|
|
hostdata->bytes_read[cmd->target] += cmd->request_bufflen;
|
957 |
|
|
hostdata->pendingr++;
|
958 |
|
|
break;
|
959 |
|
|
}
|
960 |
|
|
#endif
|
961 |
|
|
|
962 |
|
|
/*
|
963 |
|
|
* We use the host_scribble field as a pointer to the next command
|
964 |
|
|
* in a queue
|
965 |
|
|
*/
|
966 |
|
|
|
967 |
|
|
NEXT(cmd) = NULL;
|
968 |
|
|
cmd->scsi_done = done;
|
969 |
|
|
|
970 |
|
|
cmd->result = 0;
|
971 |
|
|
|
972 |
|
|
|
973 |
|
|
/*
|
974 |
|
|
* Insert the cmd into the issue queue. Note that REQUEST SENSE
|
975 |
|
|
* commands are added to the head of the queue since any command will
|
976 |
|
|
* clear the contingent allegiance condition that exists and the
|
977 |
|
|
* sense data is only guaranteed to be valid while the condition exists.
|
978 |
|
|
*/
|
979 |
|
|
|
980 |
|
|
save_flags(flags);
|
981 |
|
|
cli();
|
982 |
|
|
/* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
|
983 |
|
|
* Otherwise a running NCR5380_main may steal the lock.
|
984 |
|
|
* Lock before actually inserting due to fairness reasons explained in
|
985 |
|
|
* atari_scsi.c. If we insert first, then it's impossible for this driver
|
986 |
|
|
* to release the lock.
|
987 |
|
|
* Stop timer for this command while waiting for the lock, or timeouts
|
988 |
|
|
* may happen (and they really do), and it's no good if the command doesn't
|
989 |
|
|
* appear in any of the queues.
|
990 |
|
|
* ++roman: Just disabling the NCR interrupt isn't sufficient here,
|
991 |
|
|
* because also a timer int can trigger an abort or reset, which would
|
992 |
|
|
* alter queues and touch the lock.
|
993 |
|
|
*/
|
994 |
|
|
if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
|
995 |
|
|
LIST(cmd, hostdata->issue_queue);
|
996 |
|
|
NEXT(cmd) = hostdata->issue_queue;
|
997 |
|
|
hostdata->issue_queue = cmd;
|
998 |
|
|
} else {
|
999 |
|
|
for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
|
1000 |
|
|
NEXT(tmp); tmp = NEXT(tmp))
|
1001 |
|
|
;
|
1002 |
|
|
LIST(cmd, tmp);
|
1003 |
|
|
NEXT(tmp) = cmd;
|
1004 |
|
|
}
|
1005 |
|
|
|
1006 |
|
|
restore_flags(flags);
|
1007 |
|
|
|
1008 |
|
|
QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
|
1009 |
|
|
(cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
|
1010 |
|
|
|
1011 |
|
|
/* If queue_command() is called from an interrupt (real one or bottom
|
1012 |
|
|
* half), we let queue_main() do the job of taking care about main. If it
|
1013 |
|
|
* is already running, this is a no-op, else main will be queued.
|
1014 |
|
|
*
|
1015 |
|
|
* If we're not in an interrupt, we can call NCR5380_main()
|
1016 |
|
|
* unconditionally, because it cannot be already running.
|
1017 |
|
|
*/
|
1018 |
|
|
if (in_interrupt() || ((flags >> 8) & 7) >= 6)
|
1019 |
|
|
queue_main();
|
1020 |
|
|
else
|
1021 |
|
|
NCR5380_main();
|
1022 |
|
|
return 0;
|
1023 |
|
|
}
|
1024 |
|
|
|
1025 |
|
|
/*
|
1026 |
|
|
* Function : NCR5380_main (void)
|
1027 |
|
|
*
|
1028 |
|
|
* Purpose : NCR5380_main is a coroutine that runs as long as more work can
|
1029 |
|
|
* be done on the NCR5380 host adapters in a system. Both
|
1030 |
|
|
* NCR5380_queue_command() and NCR5380_intr() will try to start it
|
1031 |
|
|
* in case it is not running.
|
1032 |
|
|
*
|
1033 |
|
|
* NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
|
1034 |
|
|
* reenable them. This prevents reentrancy and kernel stack overflow.
|
1035 |
|
|
*/
|
1036 |
|
|
|
1037 |
|
|
static void NCR5380_main (void)
|
1038 |
|
|
{
|
1039 |
|
|
Scsi_Cmnd *tmp, *prev;
|
1040 |
|
|
struct Scsi_Host *instance = first_instance;
|
1041 |
|
|
struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
|
1042 |
|
|
int done;
|
1043 |
|
|
unsigned long flags;
|
1044 |
|
|
|
1045 |
|
|
/*
|
1046 |
|
|
* We run (with interrupts disabled) until we're sure that none of
|
1047 |
|
|
* the host adapters have anything that can be done, at which point
|
1048 |
|
|
* we set main_running to 0 and exit.
|
1049 |
|
|
*
|
1050 |
|
|
* Interrupts are enabled before doing various other internal
|
1051 |
|
|
* instructions, after we've decided that we need to run through
|
1052 |
|
|
* the loop again.
|
1053 |
|
|
*
|
1054 |
|
|
* this should prevent any race conditions.
|
1055 |
|
|
*
|
1056 |
|
|
* ++roman: Just disabling the NCR interrupt isn't sufficient here,
|
1057 |
|
|
* because also a timer int can trigger an abort or reset, which can
|
1058 |
|
|
* alter queues and touch the Falcon lock.
|
1059 |
|
|
*/
|
1060 |
|
|
|
1061 |
|
|
/* Tell int handlers main() is now already executing. Note that
|
1062 |
|
|
no races are possible here. If an int comes in before
|
1063 |
|
|
'main_running' is set here, and queues/executes main via the
|
1064 |
|
|
task queue, it doesn't do any harm, just this instance of main
|
1065 |
|
|
won't find any work left to do. */
|
1066 |
|
|
if (main_running)
|
1067 |
|
|
return;
|
1068 |
|
|
main_running = 1;
|
1069 |
|
|
|
1070 |
|
|
save_flags(flags);
|
1071 |
|
|
do {
|
1072 |
|
|
cli(); /* Freeze request queues */
|
1073 |
|
|
done = 1;
|
1074 |
|
|
|
1075 |
|
|
if (!hostdata->connected) {
|
1076 |
|
|
MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
|
1077 |
|
|
/*
|
1078 |
|
|
* Search through the issue_queue for a command destined
|
1079 |
|
|
* for a target that's not busy.
|
1080 |
|
|
*/
|
1081 |
|
|
#if (NDEBUG & NDEBUG_LISTS)
|
1082 |
|
|
for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
|
1083 |
|
|
tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
|
1084 |
|
|
;
|
1085 |
|
|
if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
|
1086 |
|
|
#endif
|
1087 |
|
|
for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
|
1088 |
|
|
prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
|
1089 |
|
|
|
1090 |
|
|
#if (NDEBUG & NDEBUG_LISTS)
|
1091 |
|
|
if (prev != tmp)
|
1092 |
|
|
printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
|
1093 |
|
|
tmp, tmp->target, hostdata->busy[tmp->target],
|
1094 |
|
|
tmp->lun);
|
1095 |
|
|
#endif
|
1096 |
|
|
/* When we find one, remove it from the issue queue. */
|
1097 |
|
|
/* ++guenther: possible race with Falcon locking */
|
1098 |
|
|
if (
|
1099 |
|
|
#ifdef SUPPORT_TAGS
|
1100 |
|
|
!is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
|
1101 |
|
|
#else
|
1102 |
|
|
!(hostdata->busy[tmp->target] & (1 << tmp->lun))
|
1103 |
|
|
#endif
|
1104 |
|
|
) {
|
1105 |
|
|
cli(); /* ++guenther: just to be sure, this must be atomic */
|
1106 |
|
|
if (prev) {
|
1107 |
|
|
REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
|
1108 |
|
|
NEXT(prev) = NEXT(tmp);
|
1109 |
|
|
} else {
|
1110 |
|
|
REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
|
1111 |
|
|
hostdata->issue_queue = NEXT(tmp);
|
1112 |
|
|
}
|
1113 |
|
|
NEXT(tmp) = NULL;
|
1114 |
|
|
|
1115 |
|
|
/* reenable interrupts after finding one */
|
1116 |
|
|
restore_flags(flags);
|
1117 |
|
|
|
1118 |
|
|
/*
|
1119 |
|
|
* Attempt to establish an I_T_L nexus here.
|
1120 |
|
|
* On success, instance->hostdata->connected is set.
|
1121 |
|
|
* On failure, we must add the command back to the
|
1122 |
|
|
* issue queue so we can keep trying.
|
1123 |
|
|
*/
|
1124 |
|
|
MAIN_PRINTK("scsi%d: main(): command for target %d "
|
1125 |
|
|
"lun %d removed from issue_queue\n",
|
1126 |
|
|
HOSTNO, tmp->target, tmp->lun);
|
1127 |
|
|
/*
|
1128 |
|
|
* REQUEST SENSE commands are issued without tagged
|
1129 |
|
|
* queueing, even on SCSI-II devices because the
|
1130 |
|
|
* contingent allegiance condition exists for the
|
1131 |
|
|
* entire unit.
|
1132 |
|
|
*/
|
1133 |
|
|
/* ++roman: ...and the standard also requires that
|
1134 |
|
|
* REQUEST SENSE command are untagged.
|
1135 |
|
|
*/
|
1136 |
|
|
|
1137 |
|
|
#ifdef SUPPORT_TAGS
|
1138 |
|
|
cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
|
1139 |
|
|
#endif
|
1140 |
|
|
if (!NCR5380_select(instance, tmp,
|
1141 |
|
|
(tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
|
1142 |
|
|
TAG_NEXT)) {
|
1143 |
|
|
break;
|
1144 |
|
|
} else {
|
1145 |
|
|
cli();
|
1146 |
|
|
LIST(tmp, hostdata->issue_queue);
|
1147 |
|
|
NEXT(tmp) = hostdata->issue_queue;
|
1148 |
|
|
hostdata->issue_queue = tmp;
|
1149 |
|
|
#ifdef SUPPORT_TAGS
|
1150 |
|
|
cmd_free_tag( tmp );
|
1151 |
|
|
#endif
|
1152 |
|
|
restore_flags(flags);
|
1153 |
|
|
MAIN_PRINTK("scsi%d: main(): select() failed, "
|
1154 |
|
|
"returned to issue_queue\n", HOSTNO);
|
1155 |
|
|
if (hostdata->connected)
|
1156 |
|
|
break;
|
1157 |
|
|
}
|
1158 |
|
|
} /* if target/lun/target queue is not busy */
|
1159 |
|
|
} /* for issue_queue */
|
1160 |
|
|
} /* if (!hostdata->connected) */
|
1161 |
|
|
if (hostdata->connected
|
1162 |
|
|
#ifdef REAL_DMA
|
1163 |
|
|
&& !hostdata->dma_len
|
1164 |
|
|
#endif
|
1165 |
|
|
) {
|
1166 |
|
|
restore_flags(flags);
|
1167 |
|
|
MAIN_PRINTK("scsi%d: main: performing information transfer\n",
|
1168 |
|
|
HOSTNO);
|
1169 |
|
|
NCR5380_information_transfer(instance);
|
1170 |
|
|
MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
|
1171 |
|
|
done = 0;
|
1172 |
|
|
}
|
1173 |
|
|
} while (!done);
|
1174 |
|
|
|
1175 |
|
|
/* Better allow ints _after_ 'main_running' has been cleared, else
|
1176 |
|
|
an interrupt could believe we'll pick up the work it left for
|
1177 |
|
|
us, but we won't see it anymore here... */
|
1178 |
|
|
main_running = 0;
|
1179 |
|
|
restore_flags(flags);
|
1180 |
|
|
}
|
1181 |
|
|
|
1182 |
|
|
|
1183 |
|
|
#ifdef REAL_DMA
|
1184 |
|
|
/*
|
1185 |
|
|
* Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
|
1186 |
|
|
*
|
1187 |
|
|
* Purpose : Called by interrupt handler when DMA finishes or a phase
|
1188 |
|
|
* mismatch occurs (which would finish the DMA transfer).
|
1189 |
|
|
*
|
1190 |
|
|
* Inputs : instance - this instance of the NCR5380.
|
1191 |
|
|
*
|
1192 |
|
|
*/
|
1193 |
|
|
|
1194 |
|
|
static void NCR5380_dma_complete( struct Scsi_Host *instance )
|
1195 |
|
|
{
|
1196 |
|
|
SETUP_HOSTDATA(instance);
|
1197 |
|
|
int transfered;
|
1198 |
|
|
unsigned char **data;
|
1199 |
|
|
volatile int *count;
|
1200 |
|
|
|
1201 |
|
|
if (!hostdata->connected) {
|
1202 |
|
|
printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
|
1203 |
|
|
"no connected cmd\n", HOSTNO);
|
1204 |
|
|
return;
|
1205 |
|
|
}
|
1206 |
|
|
|
1207 |
|
|
DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
|
1208 |
|
|
HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
|
1209 |
|
|
NCR5380_read(STATUS_REG));
|
1210 |
|
|
|
1211 |
|
|
if((sun3scsi_dma_finish(hostdata->connected->request.cmd))) {
|
1212 |
|
|
printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
|
1213 |
|
|
printk("please e-mail sammy@sammy.net with a description of how this\n");
|
1214 |
|
|
printk("error was produced.\n");
|
1215 |
|
|
BUG();
|
1216 |
|
|
}
|
1217 |
|
|
|
1218 |
|
|
/* make sure we're not stuck in a data phase */
|
1219 |
|
|
if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
|
1220 |
|
|
BASR_ACK)) ==
|
1221 |
|
|
(BASR_PHASE_MATCH | BASR_ACK)) {
|
1222 |
|
|
printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
|
1223 |
|
|
printk("scsi%d: bus stuck in data phase -- probably a single byte "
|
1224 |
|
|
"overrun!\n", HOSTNO);
|
1225 |
|
|
printk("not prepared for this error!\n");
|
1226 |
|
|
printk("please e-mail sammy@sammy.net with a description of how this\n");
|
1227 |
|
|
printk("error was produced.\n");
|
1228 |
|
|
BUG();
|
1229 |
|
|
}
|
1230 |
|
|
|
1231 |
|
|
|
1232 |
|
|
|
1233 |
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
1234 |
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
1235 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
1236 |
|
|
|
1237 |
|
|
transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
|
1238 |
|
|
hostdata->dma_len = 0;
|
1239 |
|
|
|
1240 |
|
|
data = (unsigned char **) &(hostdata->connected->SCp.ptr);
|
1241 |
|
|
count = &(hostdata->connected->SCp.this_residual);
|
1242 |
|
|
*data += transfered;
|
1243 |
|
|
*count -= transfered;
|
1244 |
|
|
|
1245 |
|
|
}
|
1246 |
|
|
#endif /* REAL_DMA */
|
1247 |
|
|
|
1248 |
|
|
|
1249 |
|
|
/*
|
1250 |
|
|
* Function : void NCR5380_intr (int irq)
|
1251 |
|
|
*
|
1252 |
|
|
* Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
|
1253 |
|
|
* from the disconnected queue, and restarting NCR5380_main()
|
1254 |
|
|
* as required.
|
1255 |
|
|
*
|
1256 |
|
|
* Inputs : int irq, irq that caused this interrupt.
|
1257 |
|
|
*
|
1258 |
|
|
*/
|
1259 |
|
|
|
1260 |
|
|
static void NCR5380_intr (int irq, void *dev_id, struct pt_regs *regs)
|
1261 |
|
|
{
|
1262 |
|
|
struct Scsi_Host *instance = first_instance;
|
1263 |
|
|
int done = 1;
|
1264 |
|
|
unsigned char basr;
|
1265 |
|
|
|
1266 |
|
|
INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
|
1267 |
|
|
|
1268 |
|
|
/* Look for pending interrupts */
|
1269 |
|
|
basr = NCR5380_read(BUS_AND_STATUS_REG);
|
1270 |
|
|
INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
|
1271 |
|
|
/* dispatch to appropriate routine if found and done=0 */
|
1272 |
|
|
if (basr & BASR_IRQ) {
|
1273 |
|
|
NCR_PRINT(NDEBUG_INTR);
|
1274 |
|
|
if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
|
1275 |
|
|
done = 0;
|
1276 |
|
|
ENABLE_IRQ();
|
1277 |
|
|
INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
|
1278 |
|
|
NCR5380_reselect(instance);
|
1279 |
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
1280 |
|
|
}
|
1281 |
|
|
else if (basr & BASR_PARITY_ERROR) {
|
1282 |
|
|
INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
|
1283 |
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
1284 |
|
|
}
|
1285 |
|
|
else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
|
1286 |
|
|
INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
|
1287 |
|
|
(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
1288 |
|
|
}
|
1289 |
|
|
else {
|
1290 |
|
|
/*
|
1291 |
|
|
* The rest of the interrupt conditions can occur only during a
|
1292 |
|
|
* DMA transfer
|
1293 |
|
|
*/
|
1294 |
|
|
|
1295 |
|
|
#if defined(REAL_DMA)
|
1296 |
|
|
/*
|
1297 |
|
|
* We should only get PHASE MISMATCH and EOP interrupts if we have
|
1298 |
|
|
* DMA enabled, so do a sanity check based on the current setting
|
1299 |
|
|
* of the MODE register.
|
1300 |
|
|
*/
|
1301 |
|
|
|
1302 |
|
|
if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
|
1303 |
|
|
((basr & BASR_END_DMA_TRANSFER) ||
|
1304 |
|
|
!(basr & BASR_PHASE_MATCH))) {
|
1305 |
|
|
|
1306 |
|
|
INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
|
1307 |
|
|
NCR5380_dma_complete( instance );
|
1308 |
|
|
done = 0;
|
1309 |
|
|
ENABLE_IRQ();
|
1310 |
|
|
} else
|
1311 |
|
|
#endif /* REAL_DMA */
|
1312 |
|
|
{
|
1313 |
|
|
/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
|
1314 |
|
|
if (basr & BASR_PHASE_MATCH)
|
1315 |
|
|
INT_PRINTK("scsi%d: unknown interrupt, "
|
1316 |
|
|
"BASR 0x%x, MR 0x%x, SR 0x%x\n",
|
1317 |
|
|
HOSTNO, basr, NCR5380_read(MODE_REG),
|
1318 |
|
|
NCR5380_read(STATUS_REG));
|
1319 |
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
1320 |
|
|
#ifdef SUN3_SCSI_VME
|
1321 |
|
|
dregs->csr |= CSR_DMA_ENABLE;
|
1322 |
|
|
#endif
|
1323 |
|
|
}
|
1324 |
|
|
} /* if !(SELECTION || PARITY) */
|
1325 |
|
|
} /* BASR & IRQ */
|
1326 |
|
|
else {
|
1327 |
|
|
|
1328 |
|
|
printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
|
1329 |
|
|
"BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
|
1330 |
|
|
NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
|
1331 |
|
|
(void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
1332 |
|
|
#ifdef SUN3_SCSI_VME
|
1333 |
|
|
dregs->csr |= CSR_DMA_ENABLE;
|
1334 |
|
|
#endif
|
1335 |
|
|
}
|
1336 |
|
|
|
1337 |
|
|
if (!done) {
|
1338 |
|
|
INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
|
1339 |
|
|
/* Put a call to NCR5380_main() on the queue... */
|
1340 |
|
|
queue_main();
|
1341 |
|
|
}
|
1342 |
|
|
}
|
1343 |
|
|
|
1344 |
|
|
#ifdef NCR5380_STATS
|
1345 |
|
|
static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd)
|
1346 |
|
|
{
|
1347 |
|
|
# ifdef NCR5380_STAT_LIMIT
|
1348 |
|
|
if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
|
1349 |
|
|
# endif
|
1350 |
|
|
switch (cmd->cmnd[0])
|
1351 |
|
|
{
|
1352 |
|
|
case WRITE:
|
1353 |
|
|
case WRITE_6:
|
1354 |
|
|
case WRITE_10:
|
1355 |
|
|
hostdata->time_write[cmd->target] += (jiffies - hostdata->timebase);
|
1356 |
|
|
/*hostdata->bytes_write[cmd->target] += cmd->request_bufflen;*/
|
1357 |
|
|
hostdata->pendingw--;
|
1358 |
|
|
break;
|
1359 |
|
|
case READ:
|
1360 |
|
|
case READ_6:
|
1361 |
|
|
case READ_10:
|
1362 |
|
|
hostdata->time_read[cmd->target] += (jiffies - hostdata->timebase);
|
1363 |
|
|
/*hostdata->bytes_read[cmd->target] += cmd->request_bufflen;*/
|
1364 |
|
|
hostdata->pendingr--;
|
1365 |
|
|
break;
|
1366 |
|
|
}
|
1367 |
|
|
}
|
1368 |
|
|
#endif
|
1369 |
|
|
|
1370 |
|
|
/*
|
1371 |
|
|
* Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
|
1372 |
|
|
* int tag);
|
1373 |
|
|
*
|
1374 |
|
|
* Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
|
1375 |
|
|
* including ARBITRATION, SELECTION, and initial message out for
|
1376 |
|
|
* IDENTIFY and queue messages.
|
1377 |
|
|
*
|
1378 |
|
|
* Inputs : instance - instantiation of the 5380 driver on which this
|
1379 |
|
|
* target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
|
1380 |
|
|
* new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
|
1381 |
|
|
* the command that is presently connected.
|
1382 |
|
|
*
|
1383 |
|
|
* Returns : -1 if selection could not execute for some reason,
|
1384 |
|
|
* 0 if selection succeeded or failed because the target
|
1385 |
|
|
* did not respond.
|
1386 |
|
|
*
|
1387 |
|
|
* Side effects :
|
1388 |
|
|
* If bus busy, arbitration failed, etc, NCR5380_select() will exit
|
1389 |
|
|
* with registers as they should have been on entry - ie
|
1390 |
|
|
* SELECT_ENABLE will be set appropriately, the NCR5380
|
1391 |
|
|
* will cease to drive any SCSI bus signals.
|
1392 |
|
|
*
|
1393 |
|
|
* If successful : I_T_L or I_T_L_Q nexus will be established,
|
1394 |
|
|
* instance->connected will be set to cmd.
|
1395 |
|
|
* SELECT interrupt will be disabled.
|
1396 |
|
|
*
|
1397 |
|
|
* If failed (no target) : cmd->scsi_done() will be called, and the
|
1398 |
|
|
* cmd->result host byte set to DID_BAD_TARGET.
|
1399 |
|
|
*/
|
1400 |
|
|
|
1401 |
|
|
static int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
|
1402 |
|
|
{
|
1403 |
|
|
SETUP_HOSTDATA(instance);
|
1404 |
|
|
unsigned char tmp[3], phase;
|
1405 |
|
|
unsigned char *data;
|
1406 |
|
|
int len;
|
1407 |
|
|
unsigned long timeout;
|
1408 |
|
|
unsigned long flags;
|
1409 |
|
|
|
1410 |
|
|
hostdata->restart_select = 0;
|
1411 |
|
|
NCR_PRINT(NDEBUG_ARBITRATION);
|
1412 |
|
|
ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
|
1413 |
|
|
instance->this_id);
|
1414 |
|
|
|
1415 |
|
|
/*
|
1416 |
|
|
* Set the phase bits to 0, otherwise the NCR5380 won't drive the
|
1417 |
|
|
* data bus during SELECTION.
|
1418 |
|
|
*/
|
1419 |
|
|
|
1420 |
|
|
save_flags(flags);
|
1421 |
|
|
cli();
|
1422 |
|
|
if (hostdata->connected) {
|
1423 |
|
|
restore_flags(flags);
|
1424 |
|
|
return -1;
|
1425 |
|
|
}
|
1426 |
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
1427 |
|
|
|
1428 |
|
|
|
1429 |
|
|
/*
|
1430 |
|
|
* Start arbitration.
|
1431 |
|
|
*/
|
1432 |
|
|
|
1433 |
|
|
NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
|
1434 |
|
|
NCR5380_write(MODE_REG, MR_ARBITRATE);
|
1435 |
|
|
|
1436 |
|
|
restore_flags(flags);
|
1437 |
|
|
|
1438 |
|
|
/* Wait for arbitration logic to complete */
|
1439 |
|
|
#if NCR_TIMEOUT
|
1440 |
|
|
{
|
1441 |
|
|
unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
|
1442 |
|
|
|
1443 |
|
|
while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
|
1444 |
|
|
&& time_before(jiffies, timeout) && !hostdata->connected)
|
1445 |
|
|
;
|
1446 |
|
|
if (time_after_eq(jiffies, timeout))
|
1447 |
|
|
{
|
1448 |
|
|
printk("scsi : arbitration timeout at %d\n", __LINE__);
|
1449 |
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
1450 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
1451 |
|
|
return -1;
|
1452 |
|
|
}
|
1453 |
|
|
}
|
1454 |
|
|
#else /* NCR_TIMEOUT */
|
1455 |
|
|
while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
|
1456 |
|
|
&& !hostdata->connected);
|
1457 |
|
|
#endif
|
1458 |
|
|
|
1459 |
|
|
ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
|
1460 |
|
|
|
1461 |
|
|
if (hostdata->connected) {
|
1462 |
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
1463 |
|
|
return -1;
|
1464 |
|
|
}
|
1465 |
|
|
/*
|
1466 |
|
|
* The arbitration delay is 2.2us, but this is a minimum and there is
|
1467 |
|
|
* no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
|
1468 |
|
|
* the integral nature of udelay().
|
1469 |
|
|
*
|
1470 |
|
|
*/
|
1471 |
|
|
|
1472 |
|
|
udelay(3);
|
1473 |
|
|
|
1474 |
|
|
/* Check for lost arbitration */
|
1475 |
|
|
if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
|
1476 |
|
|
(NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
|
1477 |
|
|
(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
|
1478 |
|
|
hostdata->connected) {
|
1479 |
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
1480 |
|
|
ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
|
1481 |
|
|
HOSTNO);
|
1482 |
|
|
return -1;
|
1483 |
|
|
}
|
1484 |
|
|
|
1485 |
|
|
/* after/during arbitration, BSY should be asserted.
|
1486 |
|
|
IBM DPES-31080 Version S31Q works now */
|
1487 |
|
|
/* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
|
1488 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
|
1489 |
|
|
ICR_ASSERT_BSY ) ;
|
1490 |
|
|
|
1491 |
|
|
if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
|
1492 |
|
|
hostdata->connected) {
|
1493 |
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
1494 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
1495 |
|
|
ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
|
1496 |
|
|
HOSTNO);
|
1497 |
|
|
return -1;
|
1498 |
|
|
}
|
1499 |
|
|
|
1500 |
|
|
/*
|
1501 |
|
|
* Again, bus clear + bus settle time is 1.2us, however, this is
|
1502 |
|
|
* a minimum so we'll udelay ceil(1.2)
|
1503 |
|
|
*/
|
1504 |
|
|
|
1505 |
|
|
#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
|
1506 |
|
|
/* ++roman: But some targets (see above :-) seem to need a bit more... */
|
1507 |
|
|
udelay(15);
|
1508 |
|
|
#else
|
1509 |
|
|
udelay(2);
|
1510 |
|
|
#endif
|
1511 |
|
|
|
1512 |
|
|
if (hostdata->connected) {
|
1513 |
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
1514 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
1515 |
|
|
return -1;
|
1516 |
|
|
}
|
1517 |
|
|
|
1518 |
|
|
ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
|
1519 |
|
|
|
1520 |
|
|
/*
|
1521 |
|
|
* Now that we have won arbitration, start Selection process, asserting
|
1522 |
|
|
* the host and target ID's on the SCSI bus.
|
1523 |
|
|
*/
|
1524 |
|
|
|
1525 |
|
|
NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->target)));
|
1526 |
|
|
|
1527 |
|
|
/*
|
1528 |
|
|
* Raise ATN while SEL is true before BSY goes false from arbitration,
|
1529 |
|
|
* since this is the only way to guarantee that we'll get a MESSAGE OUT
|
1530 |
|
|
* phase immediately after selection.
|
1531 |
|
|
*/
|
1532 |
|
|
|
1533 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
|
1534 |
|
|
ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
|
1535 |
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
1536 |
|
|
|
1537 |
|
|
/*
|
1538 |
|
|
* Reselect interrupts must be turned off prior to the dropping of BSY,
|
1539 |
|
|
* otherwise we will trigger an interrupt.
|
1540 |
|
|
*/
|
1541 |
|
|
|
1542 |
|
|
if (hostdata->connected) {
|
1543 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
1544 |
|
|
return -1;
|
1545 |
|
|
}
|
1546 |
|
|
|
1547 |
|
|
NCR5380_write(SELECT_ENABLE_REG, 0);
|
1548 |
|
|
|
1549 |
|
|
/*
|
1550 |
|
|
* The initiator shall then wait at least two deskew delays and release
|
1551 |
|
|
* the BSY signal.
|
1552 |
|
|
*/
|
1553 |
|
|
udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
|
1554 |
|
|
|
1555 |
|
|
/* Reset BSY */
|
1556 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
|
1557 |
|
|
ICR_ASSERT_ATN | ICR_ASSERT_SEL));
|
1558 |
|
|
|
1559 |
|
|
/*
|
1560 |
|
|
* Something weird happens when we cease to drive BSY - looks
|
1561 |
|
|
* like the board/chip is letting us do another read before the
|
1562 |
|
|
* appropriate propagation delay has expired, and we're confusing
|
1563 |
|
|
* a BSY signal from ourselves as the target's response to SELECTION.
|
1564 |
|
|
*
|
1565 |
|
|
* A small delay (the 'C++' frontend breaks the pipeline with an
|
1566 |
|
|
* unnecessary jump, making it work on my 386-33/Trantor T128, the
|
1567 |
|
|
* tighter 'C' code breaks and requires this) solves the problem -
|
1568 |
|
|
* the 1 us delay is arbitrary, and only used because this delay will
|
1569 |
|
|
* be the same on other platforms and since it works here, it should
|
1570 |
|
|
* work there.
|
1571 |
|
|
*
|
1572 |
|
|
* wingel suggests that this could be due to failing to wait
|
1573 |
|
|
* one deskew delay.
|
1574 |
|
|
*/
|
1575 |
|
|
|
1576 |
|
|
udelay(1);
|
1577 |
|
|
|
1578 |
|
|
SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->target);
|
1579 |
|
|
|
1580 |
|
|
/*
|
1581 |
|
|
* The SCSI specification calls for a 250 ms timeout for the actual
|
1582 |
|
|
* selection.
|
1583 |
|
|
*/
|
1584 |
|
|
|
1585 |
|
|
timeout = jiffies + 25;
|
1586 |
|
|
|
1587 |
|
|
/*
|
1588 |
|
|
* XXX very interesting - we're seeing a bounce where the BSY we
|
1589 |
|
|
* asserted is being reflected / still asserted (propagation delay?)
|
1590 |
|
|
* and it's detecting as true. Sigh.
|
1591 |
|
|
*/
|
1592 |
|
|
|
1593 |
|
|
#if 0
|
1594 |
|
|
/* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
|
1595 |
|
|
* IO while SEL is true. But again, there are some disks out the in the
|
1596 |
|
|
* world that do that nevertheless. (Somebody claimed that this announces
|
1597 |
|
|
* reselection capability of the target.) So we better skip that test and
|
1598 |
|
|
* only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
|
1599 |
|
|
*/
|
1600 |
|
|
|
1601 |
|
|
while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
|
1602 |
|
|
(SR_BSY | SR_IO)));
|
1603 |
|
|
|
1604 |
|
|
if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
|
1605 |
|
|
(SR_SEL | SR_IO)) {
|
1606 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
1607 |
|
|
NCR5380_reselect(instance);
|
1608 |
|
|
printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
|
1609 |
|
|
HOSTNO);
|
1610 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
1611 |
|
|
return -1;
|
1612 |
|
|
}
|
1613 |
|
|
#else
|
1614 |
|
|
while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
|
1615 |
|
|
#endif
|
1616 |
|
|
|
1617 |
|
|
/*
|
1618 |
|
|
* No less than two deskew delays after the initiator detects the
|
1619 |
|
|
* BSY signal is true, it shall release the SEL signal and may
|
1620 |
|
|
* change the DATA BUS. -wingel
|
1621 |
|
|
*/
|
1622 |
|
|
|
1623 |
|
|
udelay(1);
|
1624 |
|
|
|
1625 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
1626 |
|
|
|
1627 |
|
|
if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
|
1628 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
1629 |
|
|
if (hostdata->targets_present & (1 << cmd->target)) {
|
1630 |
|
|
printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
|
1631 |
|
|
if (hostdata->restart_select)
|
1632 |
|
|
printk(KERN_NOTICE "\trestart select\n");
|
1633 |
|
|
NCR_PRINT(NDEBUG_ANY);
|
1634 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
1635 |
|
|
return -1;
|
1636 |
|
|
}
|
1637 |
|
|
cmd->result = DID_BAD_TARGET << 16;
|
1638 |
|
|
#ifdef NCR5380_STATS
|
1639 |
|
|
collect_stats(hostdata, cmd);
|
1640 |
|
|
#endif
|
1641 |
|
|
#ifdef SUPPORT_TAGS
|
1642 |
|
|
cmd_free_tag( cmd );
|
1643 |
|
|
#endif
|
1644 |
|
|
cmd->scsi_done(cmd);
|
1645 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
1646 |
|
|
SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
|
1647 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
1648 |
|
|
return 0;
|
1649 |
|
|
}
|
1650 |
|
|
|
1651 |
|
|
hostdata->targets_present |= (1 << cmd->target);
|
1652 |
|
|
|
1653 |
|
|
/*
|
1654 |
|
|
* Since we followed the SCSI spec, and raised ATN while SEL
|
1655 |
|
|
* was true but before BSY was false during selection, the information
|
1656 |
|
|
* transfer phase should be a MESSAGE OUT phase so that we can send the
|
1657 |
|
|
* IDENTIFY message.
|
1658 |
|
|
*
|
1659 |
|
|
* If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
|
1660 |
|
|
* message (2 bytes) with a tag ID that we increment with every command
|
1661 |
|
|
* until it wraps back to 0.
|
1662 |
|
|
*
|
1663 |
|
|
* XXX - it turns out that there are some broken SCSI-II devices,
|
1664 |
|
|
* which claim to support tagged queuing but fail when more than
|
1665 |
|
|
* some number of commands are issued at once.
|
1666 |
|
|
*/
|
1667 |
|
|
|
1668 |
|
|
/* Wait for start of REQ/ACK handshake */
|
1669 |
|
|
while (!(NCR5380_read(STATUS_REG) & SR_REQ));
|
1670 |
|
|
|
1671 |
|
|
SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
|
1672 |
|
|
HOSTNO, cmd->target);
|
1673 |
|
|
tmp[0] = IDENTIFY(1, cmd->lun);
|
1674 |
|
|
|
1675 |
|
|
#ifdef SUPPORT_TAGS
|
1676 |
|
|
if (cmd->tag != TAG_NONE) {
|
1677 |
|
|
tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
|
1678 |
|
|
tmp[2] = cmd->tag;
|
1679 |
|
|
len = 3;
|
1680 |
|
|
} else
|
1681 |
|
|
len = 1;
|
1682 |
|
|
#else
|
1683 |
|
|
len = 1;
|
1684 |
|
|
cmd->tag=0;
|
1685 |
|
|
#endif /* SUPPORT_TAGS */
|
1686 |
|
|
|
1687 |
|
|
/* Send message(s) */
|
1688 |
|
|
data = tmp;
|
1689 |
|
|
phase = PHASE_MSGOUT;
|
1690 |
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
1691 |
|
|
SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
|
1692 |
|
|
/* XXX need to handle errors here */
|
1693 |
|
|
hostdata->connected = cmd;
|
1694 |
|
|
#ifndef SUPPORT_TAGS
|
1695 |
|
|
hostdata->busy[cmd->target] |= (1 << cmd->lun);
|
1696 |
|
|
#endif
|
1697 |
|
|
#ifdef SUN3_SCSI_VME
|
1698 |
|
|
dregs->csr |= CSR_INTR;
|
1699 |
|
|
#endif
|
1700 |
|
|
initialize_SCp(cmd);
|
1701 |
|
|
|
1702 |
|
|
|
1703 |
|
|
return 0;
|
1704 |
|
|
}
|
1705 |
|
|
|
1706 |
|
|
/*
|
1707 |
|
|
* Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
|
1708 |
|
|
* unsigned char *phase, int *count, unsigned char **data)
|
1709 |
|
|
*
|
1710 |
|
|
* Purpose : transfers data in given phase using polled I/O
|
1711 |
|
|
*
|
1712 |
|
|
* Inputs : instance - instance of driver, *phase - pointer to
|
1713 |
|
|
* what phase is expected, *count - pointer to number of
|
1714 |
|
|
* bytes to transfer, **data - pointer to data pointer.
|
1715 |
|
|
*
|
1716 |
|
|
* Returns : -1 when different phase is entered without transferring
|
1717 |
|
|
* maximum number of bytes, 0 if all bytes are transfered or exit
|
1718 |
|
|
* is in same phase.
|
1719 |
|
|
*
|
1720 |
|
|
* Also, *phase, *count, *data are modified in place.
|
1721 |
|
|
*
|
1722 |
|
|
* XXX Note : handling for bus free may be useful.
|
1723 |
|
|
*/
|
1724 |
|
|
|
1725 |
|
|
/*
|
1726 |
|
|
* Note : this code is not as quick as it could be, however it
|
1727 |
|
|
* IS 100% reliable, and for the actual data transfer where speed
|
1728 |
|
|
* counts, we will always do a pseudo DMA or DMA transfer.
|
1729 |
|
|
*/
|
1730 |
|
|
|
1731 |
|
|
static int NCR5380_transfer_pio( struct Scsi_Host *instance,
|
1732 |
|
|
unsigned char *phase, int *count,
|
1733 |
|
|
unsigned char **data)
|
1734 |
|
|
{
|
1735 |
|
|
register unsigned char p = *phase, tmp;
|
1736 |
|
|
register int c = *count;
|
1737 |
|
|
register unsigned char *d = *data;
|
1738 |
|
|
|
1739 |
|
|
/*
|
1740 |
|
|
* The NCR5380 chip will only drive the SCSI bus when the
|
1741 |
|
|
* phase specified in the appropriate bits of the TARGET COMMAND
|
1742 |
|
|
* REGISTER match the STATUS REGISTER
|
1743 |
|
|
*/
|
1744 |
|
|
|
1745 |
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
|
1746 |
|
|
|
1747 |
|
|
do {
|
1748 |
|
|
/*
|
1749 |
|
|
* Wait for assertion of REQ, after which the phase bits will be
|
1750 |
|
|
* valid
|
1751 |
|
|
*/
|
1752 |
|
|
while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
|
1753 |
|
|
|
1754 |
|
|
HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
|
1755 |
|
|
|
1756 |
|
|
/* Check for phase mismatch */
|
1757 |
|
|
if ((tmp & PHASE_MASK) != p) {
|
1758 |
|
|
PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
|
1759 |
|
|
NCR_PRINT_PHASE(NDEBUG_PIO);
|
1760 |
|
|
break;
|
1761 |
|
|
}
|
1762 |
|
|
|
1763 |
|
|
/* Do actual transfer from SCSI bus to / from memory */
|
1764 |
|
|
if (!(p & SR_IO))
|
1765 |
|
|
NCR5380_write(OUTPUT_DATA_REG, *d);
|
1766 |
|
|
else
|
1767 |
|
|
*d = NCR5380_read(CURRENT_SCSI_DATA_REG);
|
1768 |
|
|
|
1769 |
|
|
++d;
|
1770 |
|
|
|
1771 |
|
|
/*
|
1772 |
|
|
* The SCSI standard suggests that in MSGOUT phase, the initiator
|
1773 |
|
|
* should drop ATN on the last byte of the message phase
|
1774 |
|
|
* after REQ has been asserted for the handshake but before
|
1775 |
|
|
* the initiator raises ACK.
|
1776 |
|
|
*/
|
1777 |
|
|
|
1778 |
|
|
if (!(p & SR_IO)) {
|
1779 |
|
|
if (!((p & SR_MSG) && c > 1)) {
|
1780 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
1781 |
|
|
ICR_ASSERT_DATA);
|
1782 |
|
|
NCR_PRINT(NDEBUG_PIO);
|
1783 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
1784 |
|
|
ICR_ASSERT_DATA | ICR_ASSERT_ACK);
|
1785 |
|
|
} else {
|
1786 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
1787 |
|
|
ICR_ASSERT_DATA | ICR_ASSERT_ATN);
|
1788 |
|
|
NCR_PRINT(NDEBUG_PIO);
|
1789 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
1790 |
|
|
ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
|
1791 |
|
|
}
|
1792 |
|
|
} else {
|
1793 |
|
|
NCR_PRINT(NDEBUG_PIO);
|
1794 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
|
1795 |
|
|
}
|
1796 |
|
|
|
1797 |
|
|
while (NCR5380_read(STATUS_REG) & SR_REQ);
|
1798 |
|
|
|
1799 |
|
|
HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
|
1800 |
|
|
|
1801 |
|
|
/*
|
1802 |
|
|
* We have several special cases to consider during REQ/ACK handshaking :
|
1803 |
|
|
* 1. We were in MSGOUT phase, and we are on the last byte of the
|
1804 |
|
|
* message. ATN must be dropped as ACK is dropped.
|
1805 |
|
|
*
|
1806 |
|
|
* 2. We are in a MSGIN phase, and we are on the last byte of the
|
1807 |
|
|
* message. We must exit with ACK asserted, so that the calling
|
1808 |
|
|
* code may raise ATN before dropping ACK to reject the message.
|
1809 |
|
|
*
|
1810 |
|
|
* 3. ACK and ATN are clear and the target may proceed as normal.
|
1811 |
|
|
*/
|
1812 |
|
|
if (!(p == PHASE_MSGIN && c == 1)) {
|
1813 |
|
|
if (p == PHASE_MSGOUT && c > 1)
|
1814 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
1815 |
|
|
else
|
1816 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
1817 |
|
|
}
|
1818 |
|
|
} while (--c);
|
1819 |
|
|
|
1820 |
|
|
PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
|
1821 |
|
|
|
1822 |
|
|
*count = c;
|
1823 |
|
|
*data = d;
|
1824 |
|
|
tmp = NCR5380_read(STATUS_REG);
|
1825 |
|
|
/* The phase read from the bus is valid if either REQ is (already)
|
1826 |
|
|
* asserted or if ACK hasn't been released yet. The latter is the case if
|
1827 |
|
|
* we're in MSGIN and all wanted bytes have been received. */
|
1828 |
|
|
if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
|
1829 |
|
|
*phase = tmp & PHASE_MASK;
|
1830 |
|
|
else
|
1831 |
|
|
*phase = PHASE_UNKNOWN;
|
1832 |
|
|
|
1833 |
|
|
if (!c || (*phase == p))
|
1834 |
|
|
return 0;
|
1835 |
|
|
else
|
1836 |
|
|
return -1;
|
1837 |
|
|
}
|
1838 |
|
|
|
1839 |
|
|
/*
|
1840 |
|
|
* Function : do_abort (Scsi_Host *host)
|
1841 |
|
|
*
|
1842 |
|
|
* Purpose : abort the currently established nexus. Should only be
|
1843 |
|
|
* called from a routine which can drop into a
|
1844 |
|
|
*
|
1845 |
|
|
* Returns : 0 on success, -1 on failure.
|
1846 |
|
|
*/
|
1847 |
|
|
|
1848 |
|
|
static int do_abort (struct Scsi_Host *host)
|
1849 |
|
|
{
|
1850 |
|
|
unsigned char tmp, *msgptr, phase;
|
1851 |
|
|
int len;
|
1852 |
|
|
|
1853 |
|
|
/* Request message out phase */
|
1854 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
1855 |
|
|
|
1856 |
|
|
/*
|
1857 |
|
|
* Wait for the target to indicate a valid phase by asserting
|
1858 |
|
|
* REQ. Once this happens, we'll have either a MSGOUT phase
|
1859 |
|
|
* and can immediately send the ABORT message, or we'll have some
|
1860 |
|
|
* other phase and will have to source/sink data.
|
1861 |
|
|
*
|
1862 |
|
|
* We really don't care what value was on the bus or what value
|
1863 |
|
|
* the target sees, so we just handshake.
|
1864 |
|
|
*/
|
1865 |
|
|
|
1866 |
|
|
while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ);
|
1867 |
|
|
|
1868 |
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
|
1869 |
|
|
|
1870 |
|
|
if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
|
1871 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
|
1872 |
|
|
ICR_ASSERT_ACK);
|
1873 |
|
|
while (NCR5380_read(STATUS_REG) & SR_REQ);
|
1874 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
1875 |
|
|
}
|
1876 |
|
|
|
1877 |
|
|
tmp = ABORT;
|
1878 |
|
|
msgptr = &tmp;
|
1879 |
|
|
len = 1;
|
1880 |
|
|
phase = PHASE_MSGOUT;
|
1881 |
|
|
NCR5380_transfer_pio (host, &phase, &len, &msgptr);
|
1882 |
|
|
|
1883 |
|
|
/*
|
1884 |
|
|
* If we got here, and the command completed successfully,
|
1885 |
|
|
* we're about to go into bus free state.
|
1886 |
|
|
*/
|
1887 |
|
|
|
1888 |
|
|
return len ? -1 : 0;
|
1889 |
|
|
}
|
1890 |
|
|
|
1891 |
|
|
#if defined(REAL_DMA)
|
1892 |
|
|
/*
|
1893 |
|
|
* Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
|
1894 |
|
|
* unsigned char *phase, int *count, unsigned char **data)
|
1895 |
|
|
*
|
1896 |
|
|
* Purpose : transfers data in given phase using either real
|
1897 |
|
|
* or pseudo DMA.
|
1898 |
|
|
*
|
1899 |
|
|
* Inputs : instance - instance of driver, *phase - pointer to
|
1900 |
|
|
* what phase is expected, *count - pointer to number of
|
1901 |
|
|
* bytes to transfer, **data - pointer to data pointer.
|
1902 |
|
|
*
|
1903 |
|
|
* Returns : -1 when different phase is entered without transferring
|
1904 |
|
|
* maximum number of bytes, 0 if all bytes or transfered or exit
|
1905 |
|
|
* is in same phase.
|
1906 |
|
|
*
|
1907 |
|
|
* Also, *phase, *count, *data are modified in place.
|
1908 |
|
|
*
|
1909 |
|
|
*/
|
1910 |
|
|
|
1911 |
|
|
|
1912 |
|
|
static int NCR5380_transfer_dma( struct Scsi_Host *instance,
|
1913 |
|
|
unsigned char *phase, int *count,
|
1914 |
|
|
unsigned char **data)
|
1915 |
|
|
{
|
1916 |
|
|
SETUP_HOSTDATA(instance);
|
1917 |
|
|
register int c = *count;
|
1918 |
|
|
register unsigned char p = *phase;
|
1919 |
|
|
unsigned long flags;
|
1920 |
|
|
|
1921 |
|
|
/* sanity check */
|
1922 |
|
|
if(!sun3_dma_setup_done) {
|
1923 |
|
|
printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
|
1924 |
|
|
BUG();
|
1925 |
|
|
}
|
1926 |
|
|
hostdata->dma_len = c;
|
1927 |
|
|
|
1928 |
|
|
DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
|
1929 |
|
|
HOSTNO, (p & SR_IO) ? "reading" : "writing",
|
1930 |
|
|
c, (p & SR_IO) ? "to" : "from", *data);
|
1931 |
|
|
|
1932 |
|
|
/* netbsd turns off ints here, why not be safe and do it too */
|
1933 |
|
|
save_flags(flags);
|
1934 |
|
|
cli();
|
1935 |
|
|
|
1936 |
|
|
/* send start chain */
|
1937 |
|
|
sun3scsi_dma_start(c, *data);
|
1938 |
|
|
|
1939 |
|
|
if (p & SR_IO) {
|
1940 |
|
|
NCR5380_write(TARGET_COMMAND_REG, 1);
|
1941 |
|
|
NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
1942 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, 0);
|
1943 |
|
|
NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
|
1944 |
|
|
NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
|
1945 |
|
|
} else {
|
1946 |
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
1947 |
|
|
NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
1948 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
|
1949 |
|
|
NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
|
1950 |
|
|
NCR5380_write(START_DMA_SEND_REG, 0);
|
1951 |
|
|
}
|
1952 |
|
|
|
1953 |
|
|
#ifdef SUN3_SCSI_VME
|
1954 |
|
|
dregs->csr |= CSR_DMA_ENABLE;
|
1955 |
|
|
#endif
|
1956 |
|
|
|
1957 |
|
|
restore_flags(flags);
|
1958 |
|
|
|
1959 |
|
|
sun3_dma_active = 1;
|
1960 |
|
|
return 0;
|
1961 |
|
|
}
|
1962 |
|
|
#endif /* defined(REAL_DMA) */
|
1963 |
|
|
|
1964 |
|
|
/*
|
1965 |
|
|
* Function : NCR5380_information_transfer (struct Scsi_Host *instance)
|
1966 |
|
|
*
|
1967 |
|
|
* Purpose : run through the various SCSI phases and do as the target
|
1968 |
|
|
* directs us to. Operates on the currently connected command,
|
1969 |
|
|
* instance->connected.
|
1970 |
|
|
*
|
1971 |
|
|
* Inputs : instance, instance for which we are doing commands
|
1972 |
|
|
*
|
1973 |
|
|
* Side effects : SCSI things happen, the disconnected queue will be
|
1974 |
|
|
* modified if a command disconnects, *instance->connected will
|
1975 |
|
|
* change.
|
1976 |
|
|
*
|
1977 |
|
|
* XXX Note : we need to watch for bus free or a reset condition here
|
1978 |
|
|
* to recover from an unexpected bus free condition.
|
1979 |
|
|
*/
|
1980 |
|
|
|
1981 |
|
|
static void NCR5380_information_transfer (struct Scsi_Host *instance)
|
1982 |
|
|
{
|
1983 |
|
|
SETUP_HOSTDATA(instance);
|
1984 |
|
|
unsigned long flags;
|
1985 |
|
|
unsigned char msgout = NOP;
|
1986 |
|
|
int sink = 0;
|
1987 |
|
|
int len;
|
1988 |
|
|
#if defined(REAL_DMA)
|
1989 |
|
|
int transfersize;
|
1990 |
|
|
#endif
|
1991 |
|
|
unsigned char *data;
|
1992 |
|
|
unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
|
1993 |
|
|
Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
|
1994 |
|
|
|
1995 |
|
|
#ifdef SUN3_SCSI_VME
|
1996 |
|
|
dregs->csr |= CSR_INTR;
|
1997 |
|
|
#endif
|
1998 |
|
|
|
1999 |
|
|
while (1) {
|
2000 |
|
|
tmp = NCR5380_read(STATUS_REG);
|
2001 |
|
|
/* We only have a valid SCSI phase when REQ is asserted */
|
2002 |
|
|
if (tmp & SR_REQ) {
|
2003 |
|
|
phase = (tmp & PHASE_MASK);
|
2004 |
|
|
if (phase != old_phase) {
|
2005 |
|
|
old_phase = phase;
|
2006 |
|
|
NCR_PRINT_PHASE(NDEBUG_INFORMATION);
|
2007 |
|
|
}
|
2008 |
|
|
|
2009 |
|
|
if(phase == PHASE_CMDOUT) {
|
2010 |
|
|
void *d;
|
2011 |
|
|
unsigned long count;
|
2012 |
|
|
|
2013 |
|
|
if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
|
2014 |
|
|
count = cmd->SCp.buffer->length;
|
2015 |
|
|
d = cmd->SCp.buffer->address;
|
2016 |
|
|
} else {
|
2017 |
|
|
count = cmd->SCp.this_residual;
|
2018 |
|
|
d = cmd->SCp.ptr;
|
2019 |
|
|
}
|
2020 |
|
|
#ifdef REAL_DMA
|
2021 |
|
|
/* this command setup for dma yet? */
|
2022 |
|
|
if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
|
2023 |
|
|
!= cmd))
|
2024 |
|
|
{
|
2025 |
|
|
if((cmd->request.cmd == 0) || (cmd->request.cmd == 1)) {
|
2026 |
|
|
sun3scsi_dma_setup(d, count,
|
2027 |
|
|
cmd->request.cmd);
|
2028 |
|
|
sun3_dma_setup_done = cmd;
|
2029 |
|
|
}
|
2030 |
|
|
}
|
2031 |
|
|
#endif
|
2032 |
|
|
#ifdef SUN3_SCSI_VME
|
2033 |
|
|
dregs->csr |= CSR_INTR;
|
2034 |
|
|
#endif
|
2035 |
|
|
}
|
2036 |
|
|
|
2037 |
|
|
|
2038 |
|
|
if (sink && (phase != PHASE_MSGOUT)) {
|
2039 |
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
|
2040 |
|
|
|
2041 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
|
2042 |
|
|
ICR_ASSERT_ACK);
|
2043 |
|
|
while (NCR5380_read(STATUS_REG) & SR_REQ);
|
2044 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
2045 |
|
|
ICR_ASSERT_ATN);
|
2046 |
|
|
sink = 0;
|
2047 |
|
|
continue;
|
2048 |
|
|
}
|
2049 |
|
|
|
2050 |
|
|
switch (phase) {
|
2051 |
|
|
case PHASE_DATAOUT:
|
2052 |
|
|
#if (NDEBUG & NDEBUG_NO_DATAOUT)
|
2053 |
|
|
printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
|
2054 |
|
|
"aborted\n", HOSTNO);
|
2055 |
|
|
sink = 1;
|
2056 |
|
|
do_abort(instance);
|
2057 |
|
|
cmd->result = DID_ERROR << 16;
|
2058 |
|
|
cmd->done(cmd);
|
2059 |
|
|
return;
|
2060 |
|
|
#endif
|
2061 |
|
|
case PHASE_DATAIN:
|
2062 |
|
|
/*
|
2063 |
|
|
* If there is no room left in the current buffer in the
|
2064 |
|
|
* scatter-gather list, move onto the next one.
|
2065 |
|
|
*/
|
2066 |
|
|
if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
|
2067 |
|
|
++cmd->SCp.buffer;
|
2068 |
|
|
--cmd->SCp.buffers_residual;
|
2069 |
|
|
cmd->SCp.this_residual = cmd->SCp.buffer->length;
|
2070 |
|
|
cmd->SCp.ptr = cmd->SCp.buffer->address;
|
2071 |
|
|
|
2072 |
|
|
/* ++roman: Try to merge some scatter-buffers if
|
2073 |
|
|
* they are at contiguous physical addresses.
|
2074 |
|
|
*/
|
2075 |
|
|
// merge_contiguous_buffers( cmd );
|
2076 |
|
|
INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
|
2077 |
|
|
HOSTNO, cmd->SCp.this_residual,
|
2078 |
|
|
cmd->SCp.buffers_residual);
|
2079 |
|
|
}
|
2080 |
|
|
|
2081 |
|
|
/*
|
2082 |
|
|
* The preferred transfer method is going to be
|
2083 |
|
|
* PSEUDO-DMA for systems that are strictly PIO,
|
2084 |
|
|
* since we can let the hardware do the handshaking.
|
2085 |
|
|
*
|
2086 |
|
|
* For this to work, we need to know the transfersize
|
2087 |
|
|
* ahead of time, since the pseudo-DMA code will sit
|
2088 |
|
|
* in an unconditional loop.
|
2089 |
|
|
*/
|
2090 |
|
|
|
2091 |
|
|
/* ++roman: I suggest, this should be
|
2092 |
|
|
* #if def(REAL_DMA)
|
2093 |
|
|
* instead of leaving REAL_DMA out.
|
2094 |
|
|
*/
|
2095 |
|
|
|
2096 |
|
|
#if defined(REAL_DMA)
|
2097 |
|
|
// if (!cmd->device->borken &&
|
2098 |
|
|
if((transfersize =
|
2099 |
|
|
NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
|
2100 |
|
|
len = transfersize;
|
2101 |
|
|
cmd->SCp.phase = phase;
|
2102 |
|
|
|
2103 |
|
|
if (NCR5380_transfer_dma(instance, &phase,
|
2104 |
|
|
&len, (unsigned char **) &cmd->SCp.ptr)) {
|
2105 |
|
|
/*
|
2106 |
|
|
* If the watchdog timer fires, all future
|
2107 |
|
|
* accesses to this device will use the
|
2108 |
|
|
* polled-IO. */
|
2109 |
|
|
printk(KERN_NOTICE "scsi%d: switching target %d "
|
2110 |
|
|
"lun %d to slow handshake\n", HOSTNO,
|
2111 |
|
|
cmd->target, cmd->lun);
|
2112 |
|
|
cmd->device->borken = 1;
|
2113 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
2114 |
|
|
ICR_ASSERT_ATN);
|
2115 |
|
|
sink = 1;
|
2116 |
|
|
do_abort(instance);
|
2117 |
|
|
cmd->result = DID_ERROR << 16;
|
2118 |
|
|
cmd->done(cmd);
|
2119 |
|
|
/* XXX - need to source or sink data here, as appropriate */
|
2120 |
|
|
} else {
|
2121 |
|
|
#ifdef REAL_DMA
|
2122 |
|
|
/* ++roman: When using real DMA,
|
2123 |
|
|
* information_transfer() should return after
|
2124 |
|
|
* starting DMA since it has nothing more to
|
2125 |
|
|
* do.
|
2126 |
|
|
*/
|
2127 |
|
|
return;
|
2128 |
|
|
#else
|
2129 |
|
|
cmd->SCp.this_residual -= transfersize - len;
|
2130 |
|
|
#endif
|
2131 |
|
|
}
|
2132 |
|
|
} else
|
2133 |
|
|
#endif /* defined(REAL_DMA) */
|
2134 |
|
|
NCR5380_transfer_pio(instance, &phase,
|
2135 |
|
|
(int *) &cmd->SCp.this_residual, (unsigned char **)
|
2136 |
|
|
&cmd->SCp.ptr);
|
2137 |
|
|
#ifdef REAL_DMA
|
2138 |
|
|
/* if we had intended to dma that command clear it */
|
2139 |
|
|
if(sun3_dma_setup_done == cmd)
|
2140 |
|
|
sun3_dma_setup_done = NULL;
|
2141 |
|
|
#endif
|
2142 |
|
|
|
2143 |
|
|
break;
|
2144 |
|
|
case PHASE_MSGIN:
|
2145 |
|
|
len = 1;
|
2146 |
|
|
data = &tmp;
|
2147 |
|
|
NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
|
2148 |
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
2149 |
|
|
cmd->SCp.Message = tmp;
|
2150 |
|
|
|
2151 |
|
|
switch (tmp) {
|
2152 |
|
|
/*
|
2153 |
|
|
* Linking lets us reduce the time required to get the
|
2154 |
|
|
* next command out to the device, hopefully this will
|
2155 |
|
|
* mean we don't waste another revolution due to the delays
|
2156 |
|
|
* required by ARBITRATION and another SELECTION.
|
2157 |
|
|
*
|
2158 |
|
|
* In the current implementation proposal, low level drivers
|
2159 |
|
|
* merely have to start the next command, pointed to by
|
2160 |
|
|
* next_link, done() is called as with unlinked commands.
|
2161 |
|
|
*/
|
2162 |
|
|
#ifdef LINKED
|
2163 |
|
|
case LINKED_CMD_COMPLETE:
|
2164 |
|
|
case LINKED_FLG_CMD_COMPLETE:
|
2165 |
|
|
/* Accept message by clearing ACK */
|
2166 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
2167 |
|
|
|
2168 |
|
|
LNK_PRINTK("scsi%d: target %d lun %d linked command "
|
2169 |
|
|
"complete.\n", HOSTNO, cmd->target, cmd->lun);
|
2170 |
|
|
|
2171 |
|
|
/* Enable reselect interrupts */
|
2172 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
2173 |
|
|
/*
|
2174 |
|
|
* Sanity check : A linked command should only terminate
|
2175 |
|
|
* with one of these messages if there are more linked
|
2176 |
|
|
* commands available.
|
2177 |
|
|
*/
|
2178 |
|
|
|
2179 |
|
|
if (!cmd->next_link) {
|
2180 |
|
|
printk(KERN_NOTICE "scsi%d: target %d lun %d "
|
2181 |
|
|
"linked command complete, no next_link\n",
|
2182 |
|
|
HOSTNO, cmd->target, cmd->lun);
|
2183 |
|
|
sink = 1;
|
2184 |
|
|
do_abort (instance);
|
2185 |
|
|
return;
|
2186 |
|
|
}
|
2187 |
|
|
|
2188 |
|
|
initialize_SCp(cmd->next_link);
|
2189 |
|
|
/* The next command is still part of this process; copy it
|
2190 |
|
|
* and don't free it! */
|
2191 |
|
|
cmd->next_link->tag = cmd->tag;
|
2192 |
|
|
cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
|
2193 |
|
|
LNK_PRINTK("scsi%d: target %d lun %d linked request "
|
2194 |
|
|
"done, calling scsi_done().\n",
|
2195 |
|
|
HOSTNO, cmd->target, cmd->lun);
|
2196 |
|
|
#ifdef NCR5380_STATS
|
2197 |
|
|
collect_stats(hostdata, cmd);
|
2198 |
|
|
#endif
|
2199 |
|
|
cmd->scsi_done(cmd);
|
2200 |
|
|
cmd = hostdata->connected;
|
2201 |
|
|
break;
|
2202 |
|
|
#endif /* def LINKED */
|
2203 |
|
|
case ABORT:
|
2204 |
|
|
case COMMAND_COMPLETE:
|
2205 |
|
|
/* Accept message by clearing ACK */
|
2206 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
2207 |
|
|
hostdata->connected = NULL;
|
2208 |
|
|
QU_PRINTK("scsi%d: command for target %d, lun %d "
|
2209 |
|
|
"completed\n", HOSTNO, cmd->target, cmd->lun);
|
2210 |
|
|
#ifdef SUPPORT_TAGS
|
2211 |
|
|
cmd_free_tag( cmd );
|
2212 |
|
|
if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
|
2213 |
|
|
/* Turn a QUEUE FULL status into BUSY, I think the
|
2214 |
|
|
* mid level cannot handle QUEUE FULL :-( (The
|
2215 |
|
|
* command is retried after BUSY). Also update our
|
2216 |
|
|
* queue size to the number of currently issued
|
2217 |
|
|
* commands now.
|
2218 |
|
|
*/
|
2219 |
|
|
/* ++Andreas: the mid level code knows about
|
2220 |
|
|
QUEUE_FULL now. */
|
2221 |
|
|
TAG_ALLOC *ta = &TagAlloc[cmd->target][cmd->lun];
|
2222 |
|
|
TAG_PRINTK("scsi%d: target %d lun %d returned "
|
2223 |
|
|
"QUEUE_FULL after %d commands\n",
|
2224 |
|
|
HOSTNO, cmd->target, cmd->lun,
|
2225 |
|
|
ta->nr_allocated);
|
2226 |
|
|
if (ta->queue_size > ta->nr_allocated)
|
2227 |
|
|
ta->nr_allocated = ta->queue_size;
|
2228 |
|
|
}
|
2229 |
|
|
#else
|
2230 |
|
|
hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
|
2231 |
|
|
#endif
|
2232 |
|
|
/* Enable reselect interrupts */
|
2233 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
2234 |
|
|
|
2235 |
|
|
/*
|
2236 |
|
|
* I'm not sure what the correct thing to do here is :
|
2237 |
|
|
*
|
2238 |
|
|
* If the command that just executed is NOT a request
|
2239 |
|
|
* sense, the obvious thing to do is to set the result
|
2240 |
|
|
* code to the values of the stored parameters.
|
2241 |
|
|
*
|
2242 |
|
|
* If it was a REQUEST SENSE command, we need some way to
|
2243 |
|
|
* differentiate between the failure code of the original
|
2244 |
|
|
* and the failure code of the REQUEST sense - the obvious
|
2245 |
|
|
* case is success, where we fall through and leave the
|
2246 |
|
|
* result code unchanged.
|
2247 |
|
|
*
|
2248 |
|
|
* The non-obvious place is where the REQUEST SENSE failed
|
2249 |
|
|
*/
|
2250 |
|
|
|
2251 |
|
|
if (cmd->cmnd[0] != REQUEST_SENSE)
|
2252 |
|
|
cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
|
2253 |
|
|
else if (status_byte(cmd->SCp.Status) != GOOD)
|
2254 |
|
|
cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
|
2255 |
|
|
|
2256 |
|
|
#ifdef AUTOSENSE
|
2257 |
|
|
if ((cmd->cmnd[0] != REQUEST_SENSE) &&
|
2258 |
|
|
(status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
|
2259 |
|
|
ASEN_PRINTK("scsi%d: performing request sense\n",
|
2260 |
|
|
HOSTNO);
|
2261 |
|
|
cmd->cmnd[0] = REQUEST_SENSE;
|
2262 |
|
|
cmd->cmnd[1] &= 0xe0;
|
2263 |
|
|
cmd->cmnd[2] = 0;
|
2264 |
|
|
cmd->cmnd[3] = 0;
|
2265 |
|
|
cmd->cmnd[4] = sizeof(cmd->sense_buffer);
|
2266 |
|
|
cmd->cmnd[5] = 0;
|
2267 |
|
|
cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
|
2268 |
|
|
|
2269 |
|
|
cmd->use_sg = 0;
|
2270 |
|
|
/* this is initialized from initialize_SCp
|
2271 |
|
|
cmd->SCp.buffer = NULL;
|
2272 |
|
|
cmd->SCp.buffers_residual = 0;
|
2273 |
|
|
*/
|
2274 |
|
|
cmd->request_buffer = (char *) cmd->sense_buffer;
|
2275 |
|
|
cmd->request_bufflen = sizeof(cmd->sense_buffer);
|
2276 |
|
|
|
2277 |
|
|
save_flags(flags);
|
2278 |
|
|
cli();
|
2279 |
|
|
LIST(cmd,hostdata->issue_queue);
|
2280 |
|
|
NEXT(cmd) = hostdata->issue_queue;
|
2281 |
|
|
hostdata->issue_queue = (Scsi_Cmnd *) cmd;
|
2282 |
|
|
restore_flags(flags);
|
2283 |
|
|
QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
|
2284 |
|
|
"issue queue\n", H_NO(cmd));
|
2285 |
|
|
} else
|
2286 |
|
|
#endif /* def AUTOSENSE */
|
2287 |
|
|
{
|
2288 |
|
|
#ifdef NCR5380_STATS
|
2289 |
|
|
collect_stats(hostdata, cmd);
|
2290 |
|
|
#endif
|
2291 |
|
|
cmd->scsi_done(cmd);
|
2292 |
|
|
}
|
2293 |
|
|
|
2294 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
2295 |
|
|
/*
|
2296 |
|
|
* Restore phase bits to 0 so an interrupted selection,
|
2297 |
|
|
* arbitration can resume.
|
2298 |
|
|
*/
|
2299 |
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
2300 |
|
|
|
2301 |
|
|
while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
|
2302 |
|
|
barrier();
|
2303 |
|
|
|
2304 |
|
|
return;
|
2305 |
|
|
case MESSAGE_REJECT:
|
2306 |
|
|
/* Accept message by clearing ACK */
|
2307 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
2308 |
|
|
/* Enable reselect interrupts */
|
2309 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
2310 |
|
|
switch (hostdata->last_message) {
|
2311 |
|
|
case HEAD_OF_QUEUE_TAG:
|
2312 |
|
|
case ORDERED_QUEUE_TAG:
|
2313 |
|
|
case SIMPLE_QUEUE_TAG:
|
2314 |
|
|
/* The target obviously doesn't support tagged
|
2315 |
|
|
* queuing, even though it announced this ability in
|
2316 |
|
|
* its INQUIRY data ?!? (maybe only this LUN?) Ok,
|
2317 |
|
|
* clear 'tagged_supported' and lock the LUN, since
|
2318 |
|
|
* the command is treated as untagged further on.
|
2319 |
|
|
*/
|
2320 |
|
|
cmd->device->tagged_supported = 0;
|
2321 |
|
|
hostdata->busy[cmd->target] |= (1 << cmd->lun);
|
2322 |
|
|
cmd->tag = TAG_NONE;
|
2323 |
|
|
TAG_PRINTK("scsi%d: target %d lun %d rejected "
|
2324 |
|
|
"QUEUE_TAG message; tagged queuing "
|
2325 |
|
|
"disabled\n",
|
2326 |
|
|
HOSTNO, cmd->target, cmd->lun);
|
2327 |
|
|
break;
|
2328 |
|
|
}
|
2329 |
|
|
break;
|
2330 |
|
|
case DISCONNECT:
|
2331 |
|
|
/* Accept message by clearing ACK */
|
2332 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
2333 |
|
|
save_flags(flags);
|
2334 |
|
|
cli();
|
2335 |
|
|
cmd->device->disconnect = 1;
|
2336 |
|
|
LIST(cmd,hostdata->disconnected_queue);
|
2337 |
|
|
NEXT(cmd) = hostdata->disconnected_queue;
|
2338 |
|
|
hostdata->connected = NULL;
|
2339 |
|
|
hostdata->disconnected_queue = cmd;
|
2340 |
|
|
restore_flags(flags);
|
2341 |
|
|
QU_PRINTK("scsi%d: command for target %d lun %d was "
|
2342 |
|
|
"moved from connected to the "
|
2343 |
|
|
"disconnected_queue\n", HOSTNO,
|
2344 |
|
|
cmd->target, cmd->lun);
|
2345 |
|
|
/*
|
2346 |
|
|
* Restore phase bits to 0 so an interrupted selection,
|
2347 |
|
|
* arbitration can resume.
|
2348 |
|
|
*/
|
2349 |
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
2350 |
|
|
|
2351 |
|
|
/* Enable reselect interrupts */
|
2352 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
2353 |
|
|
/* Wait for bus free to avoid nasty timeouts */
|
2354 |
|
|
while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
|
2355 |
|
|
barrier();
|
2356 |
|
|
#ifdef SUN3_SCSI_VME
|
2357 |
|
|
dregs->csr |= CSR_DMA_ENABLE;
|
2358 |
|
|
#endif
|
2359 |
|
|
return;
|
2360 |
|
|
/*
|
2361 |
|
|
* The SCSI data pointer is *IMPLICITLY* saved on a disconnect
|
2362 |
|
|
* operation, in violation of the SCSI spec so we can safely
|
2363 |
|
|
* ignore SAVE/RESTORE pointers calls.
|
2364 |
|
|
*
|
2365 |
|
|
* Unfortunately, some disks violate the SCSI spec and
|
2366 |
|
|
* don't issue the required SAVE_POINTERS message before
|
2367 |
|
|
* disconnecting, and we have to break spec to remain
|
2368 |
|
|
* compatible.
|
2369 |
|
|
*/
|
2370 |
|
|
case SAVE_POINTERS:
|
2371 |
|
|
case RESTORE_POINTERS:
|
2372 |
|
|
/* Accept message by clearing ACK */
|
2373 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
2374 |
|
|
/* Enable reselect interrupts */
|
2375 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
2376 |
|
|
break;
|
2377 |
|
|
case EXTENDED_MESSAGE:
|
2378 |
|
|
/*
|
2379 |
|
|
* Extended messages are sent in the following format :
|
2380 |
|
|
* Byte
|
2381 |
|
|
* 0 EXTENDED_MESSAGE == 1
|
2382 |
|
|
* 1 length (includes one byte for code, doesn't
|
2383 |
|
|
* include first two bytes)
|
2384 |
|
|
* 2 code
|
2385 |
|
|
* 3..length+1 arguments
|
2386 |
|
|
*
|
2387 |
|
|
* Start the extended message buffer with the EXTENDED_MESSAGE
|
2388 |
|
|
* byte, since print_msg() wants the whole thing.
|
2389 |
|
|
*/
|
2390 |
|
|
extended_msg[0] = EXTENDED_MESSAGE;
|
2391 |
|
|
/* Accept first byte by clearing ACK */
|
2392 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
2393 |
|
|
|
2394 |
|
|
EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
|
2395 |
|
|
|
2396 |
|
|
len = 2;
|
2397 |
|
|
data = extended_msg + 1;
|
2398 |
|
|
phase = PHASE_MSGIN;
|
2399 |
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
2400 |
|
|
EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
|
2401 |
|
|
(int)extended_msg[1], (int)extended_msg[2]);
|
2402 |
|
|
|
2403 |
|
|
if (!len && extended_msg[1] <=
|
2404 |
|
|
(sizeof (extended_msg) - 1)) {
|
2405 |
|
|
/* Accept third byte by clearing ACK */
|
2406 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
2407 |
|
|
len = extended_msg[1] - 1;
|
2408 |
|
|
data = extended_msg + 3;
|
2409 |
|
|
phase = PHASE_MSGIN;
|
2410 |
|
|
|
2411 |
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
2412 |
|
|
EXT_PRINTK("scsi%d: message received, residual %d\n",
|
2413 |
|
|
HOSTNO, len);
|
2414 |
|
|
|
2415 |
|
|
switch (extended_msg[2]) {
|
2416 |
|
|
case EXTENDED_SDTR:
|
2417 |
|
|
case EXTENDED_WDTR:
|
2418 |
|
|
case EXTENDED_MODIFY_DATA_POINTER:
|
2419 |
|
|
case EXTENDED_EXTENDED_IDENTIFY:
|
2420 |
|
|
tmp = 0;
|
2421 |
|
|
}
|
2422 |
|
|
} else if (len) {
|
2423 |
|
|
printk(KERN_NOTICE "scsi%d: error receiving "
|
2424 |
|
|
"extended message\n", HOSTNO);
|
2425 |
|
|
tmp = 0;
|
2426 |
|
|
} else {
|
2427 |
|
|
printk(KERN_NOTICE "scsi%d: extended message "
|
2428 |
|
|
"code %02x length %d is too long\n",
|
2429 |
|
|
HOSTNO, extended_msg[2], extended_msg[1]);
|
2430 |
|
|
tmp = 0;
|
2431 |
|
|
}
|
2432 |
|
|
/* Fall through to reject message */
|
2433 |
|
|
|
2434 |
|
|
/*
|
2435 |
|
|
* If we get something weird that we aren't expecting,
|
2436 |
|
|
* reject it.
|
2437 |
|
|
*/
|
2438 |
|
|
default:
|
2439 |
|
|
if (!tmp) {
|
2440 |
|
|
printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
|
2441 |
|
|
print_msg (extended_msg);
|
2442 |
|
|
printk("\n");
|
2443 |
|
|
} else if (tmp != EXTENDED_MESSAGE)
|
2444 |
|
|
printk(KERN_DEBUG "scsi%d: rejecting unknown "
|
2445 |
|
|
"message %02x from target %d, lun %d\n",
|
2446 |
|
|
HOSTNO, tmp, cmd->target, cmd->lun);
|
2447 |
|
|
else
|
2448 |
|
|
printk(KERN_DEBUG "scsi%d: rejecting unknown "
|
2449 |
|
|
"extended message "
|
2450 |
|
|
"code %02x, length %d from target %d, lun %d\n",
|
2451 |
|
|
HOSTNO, extended_msg[1], extended_msg[0],
|
2452 |
|
|
cmd->target, cmd->lun);
|
2453 |
|
|
|
2454 |
|
|
|
2455 |
|
|
msgout = MESSAGE_REJECT;
|
2456 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
2457 |
|
|
ICR_ASSERT_ATN);
|
2458 |
|
|
break;
|
2459 |
|
|
} /* switch (tmp) */
|
2460 |
|
|
break;
|
2461 |
|
|
case PHASE_MSGOUT:
|
2462 |
|
|
len = 1;
|
2463 |
|
|
data = &msgout;
|
2464 |
|
|
hostdata->last_message = msgout;
|
2465 |
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
2466 |
|
|
if (msgout == ABORT) {
|
2467 |
|
|
#ifdef SUPPORT_TAGS
|
2468 |
|
|
cmd_free_tag( cmd );
|
2469 |
|
|
#else
|
2470 |
|
|
hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
|
2471 |
|
|
#endif
|
2472 |
|
|
hostdata->connected = NULL;
|
2473 |
|
|
cmd->result = DID_ERROR << 16;
|
2474 |
|
|
#ifdef NCR5380_STATS
|
2475 |
|
|
collect_stats(hostdata, cmd);
|
2476 |
|
|
#endif
|
2477 |
|
|
cmd->scsi_done(cmd);
|
2478 |
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
2479 |
|
|
return;
|
2480 |
|
|
}
|
2481 |
|
|
msgout = NOP;
|
2482 |
|
|
break;
|
2483 |
|
|
case PHASE_CMDOUT:
|
2484 |
|
|
len = cmd->cmd_len;
|
2485 |
|
|
data = cmd->cmnd;
|
2486 |
|
|
/*
|
2487 |
|
|
* XXX for performance reasons, on machines with a
|
2488 |
|
|
* PSEUDO-DMA architecture we should probably
|
2489 |
|
|
* use the dma transfer function.
|
2490 |
|
|
*/
|
2491 |
|
|
NCR5380_transfer_pio(instance, &phase, &len,
|
2492 |
|
|
&data);
|
2493 |
|
|
break;
|
2494 |
|
|
case PHASE_STATIN:
|
2495 |
|
|
len = 1;
|
2496 |
|
|
data = &tmp;
|
2497 |
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
2498 |
|
|
cmd->SCp.Status = tmp;
|
2499 |
|
|
break;
|
2500 |
|
|
default:
|
2501 |
|
|
printk("scsi%d: unknown phase\n", HOSTNO);
|
2502 |
|
|
NCR_PRINT(NDEBUG_ANY);
|
2503 |
|
|
} /* switch(phase) */
|
2504 |
|
|
} /* if (tmp * SR_REQ) */
|
2505 |
|
|
} /* while (1) */
|
2506 |
|
|
}
|
2507 |
|
|
|
2508 |
|
|
/*
|
2509 |
|
|
* Function : void NCR5380_reselect (struct Scsi_Host *instance)
|
2510 |
|
|
*
|
2511 |
|
|
* Purpose : does reselection, initializing the instance->connected
|
2512 |
|
|
* field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
|
2513 |
|
|
* nexus has been reestablished,
|
2514 |
|
|
*
|
2515 |
|
|
* Inputs : instance - this instance of the NCR5380.
|
2516 |
|
|
*
|
2517 |
|
|
*/
|
2518 |
|
|
|
2519 |
|
|
/* it might eventually prove necessary to do a dma setup on
|
2520 |
|
|
reselection, but it doesn't seem to be needed now -- sam */
|
2521 |
|
|
|
2522 |
|
|
static void NCR5380_reselect (struct Scsi_Host *instance)
|
2523 |
|
|
{
|
2524 |
|
|
SETUP_HOSTDATA(instance);
|
2525 |
|
|
unsigned char target_mask;
|
2526 |
|
|
unsigned char lun;
|
2527 |
|
|
#ifdef SUPPORT_TAGS
|
2528 |
|
|
unsigned char tag;
|
2529 |
|
|
#endif
|
2530 |
|
|
unsigned char msg[3];
|
2531 |
|
|
Scsi_Cmnd *tmp = NULL, *prev;
|
2532 |
|
|
/* unsigned long flags; */
|
2533 |
|
|
|
2534 |
|
|
/*
|
2535 |
|
|
* Disable arbitration, etc. since the host adapter obviously
|
2536 |
|
|
* lost, and tell an interrupted NCR5380_select() to restart.
|
2537 |
|
|
*/
|
2538 |
|
|
|
2539 |
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
2540 |
|
|
hostdata->restart_select = 1;
|
2541 |
|
|
|
2542 |
|
|
target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
|
2543 |
|
|
|
2544 |
|
|
RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
|
2545 |
|
|
|
2546 |
|
|
/*
|
2547 |
|
|
* At this point, we have detected that our SCSI ID is on the bus,
|
2548 |
|
|
* SEL is true and BSY was false for at least one bus settle delay
|
2549 |
|
|
* (400 ns).
|
2550 |
|
|
*
|
2551 |
|
|
* We must assert BSY ourselves, until the target drops the SEL
|
2552 |
|
|
* signal.
|
2553 |
|
|
*/
|
2554 |
|
|
|
2555 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
|
2556 |
|
|
|
2557 |
|
|
while (NCR5380_read(STATUS_REG) & SR_SEL);
|
2558 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
2559 |
|
|
|
2560 |
|
|
/*
|
2561 |
|
|
* Wait for target to go into MSGIN.
|
2562 |
|
|
*/
|
2563 |
|
|
|
2564 |
|
|
while (!(NCR5380_read(STATUS_REG) & SR_REQ));
|
2565 |
|
|
|
2566 |
|
|
#if 1
|
2567 |
|
|
// acknowledge toggle to MSGIN
|
2568 |
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
|
2569 |
|
|
|
2570 |
|
|
// peek at the byte without really hitting the bus
|
2571 |
|
|
msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
|
2572 |
|
|
#endif
|
2573 |
|
|
|
2574 |
|
|
if (!msg[0] & 0x80) {
|
2575 |
|
|
printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
|
2576 |
|
|
print_msg(msg);
|
2577 |
|
|
do_abort(instance);
|
2578 |
|
|
return;
|
2579 |
|
|
}
|
2580 |
|
|
lun = (msg[0] & 0x07);
|
2581 |
|
|
|
2582 |
|
|
/*
|
2583 |
|
|
* Find the command corresponding to the I_T_L or I_T_L_Q nexus we
|
2584 |
|
|
* just reestablished, and remove it from the disconnected queue.
|
2585 |
|
|
*/
|
2586 |
|
|
|
2587 |
|
|
for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
|
2588 |
|
|
tmp; prev = tmp, tmp = NEXT(tmp) ) {
|
2589 |
|
|
if ((target_mask == (1 << tmp->target)) && (lun == tmp->lun)
|
2590 |
|
|
#ifdef SUPPORT_TAGS
|
2591 |
|
|
&& (tag == tmp->tag)
|
2592 |
|
|
#endif
|
2593 |
|
|
) {
|
2594 |
|
|
if (prev) {
|
2595 |
|
|
REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
|
2596 |
|
|
NEXT(prev) = NEXT(tmp);
|
2597 |
|
|
} else {
|
2598 |
|
|
REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
|
2599 |
|
|
hostdata->disconnected_queue = NEXT(tmp);
|
2600 |
|
|
}
|
2601 |
|
|
NEXT(tmp) = NULL;
|
2602 |
|
|
break;
|
2603 |
|
|
}
|
2604 |
|
|
}
|
2605 |
|
|
|
2606 |
|
|
if (!tmp) {
|
2607 |
|
|
printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
|
2608 |
|
|
#ifdef SUPPORT_TAGS
|
2609 |
|
|
"tag %d "
|
2610 |
|
|
#endif
|
2611 |
|
|
"not in disconnected_queue.\n",
|
2612 |
|
|
HOSTNO, target_mask, lun
|
2613 |
|
|
#ifdef SUPPORT_TAGS
|
2614 |
|
|
, tag
|
2615 |
|
|
#endif
|
2616 |
|
|
);
|
2617 |
|
|
/*
|
2618 |
|
|
* Since we have an established nexus that we can't do anything
|
2619 |
|
|
* with, we must abort it.
|
2620 |
|
|
*/
|
2621 |
|
|
do_abort(instance);
|
2622 |
|
|
return;
|
2623 |
|
|
}
|
2624 |
|
|
#if 1
|
2625 |
|
|
/* engage dma setup for the command we just saw */
|
2626 |
|
|
{
|
2627 |
|
|
void *d;
|
2628 |
|
|
unsigned long count;
|
2629 |
|
|
|
2630 |
|
|
if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
|
2631 |
|
|
count = tmp->SCp.buffer->length;
|
2632 |
|
|
d = tmp->SCp.buffer->address;
|
2633 |
|
|
} else {
|
2634 |
|
|
count = tmp->SCp.this_residual;
|
2635 |
|
|
d = tmp->SCp.ptr;
|
2636 |
|
|
}
|
2637 |
|
|
#ifdef REAL_DMA
|
2638 |
|
|
/* setup this command for dma if not already */
|
2639 |
|
|
if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
|
2640 |
|
|
!= tmp))
|
2641 |
|
|
{
|
2642 |
|
|
sun3scsi_dma_setup(d, count,
|
2643 |
|
|
tmp->request.cmd);
|
2644 |
|
|
sun3_dma_setup_done = tmp;
|
2645 |
|
|
}
|
2646 |
|
|
#endif
|
2647 |
|
|
}
|
2648 |
|
|
#endif
|
2649 |
|
|
|
2650 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
|
2651 |
|
|
/* Accept message by clearing ACK */
|
2652 |
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
2653 |
|
|
|
2654 |
|
|
#ifdef SUPPORT_TAGS
|
2655 |
|
|
/* If the phase is still MSGIN, the target wants to send some more
|
2656 |
|
|
* messages. In case it supports tagged queuing, this is probably a
|
2657 |
|
|
* SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
|
2658 |
|
|
*/
|
2659 |
|
|
tag = TAG_NONE;
|
2660 |
|
|
if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
|
2661 |
|
|
/* Accept previous IDENTIFY message by clearing ACK */
|
2662 |
|
|
NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
|
2663 |
|
|
len = 2;
|
2664 |
|
|
data = msg+1;
|
2665 |
|
|
if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
|
2666 |
|
|
msg[1] == SIMPLE_QUEUE_TAG)
|
2667 |
|
|
tag = msg[2];
|
2668 |
|
|
TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
|
2669 |
|
|
"reselection\n", HOSTNO, target_mask, lun, tag);
|
2670 |
|
|
}
|
2671 |
|
|
#endif
|
2672 |
|
|
|
2673 |
|
|
hostdata->connected = tmp;
|
2674 |
|
|
RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
|
2675 |
|
|
HOSTNO, tmp->target, tmp->lun, tmp->tag);
|
2676 |
|
|
}
|
2677 |
|
|
|
2678 |
|
|
|
2679 |
|
|
/*
|
2680 |
|
|
* Function : int NCR5380_abort (Scsi_Cmnd *cmd)
|
2681 |
|
|
*
|
2682 |
|
|
* Purpose : abort a command
|
2683 |
|
|
*
|
2684 |
|
|
* Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
|
2685 |
|
|
* host byte of the result field to, if zero DID_ABORTED is
|
2686 |
|
|
* used.
|
2687 |
|
|
*
|
2688 |
|
|
* Returns : 0 - success, -1 on failure.
|
2689 |
|
|
*
|
2690 |
|
|
* XXX - there is no way to abort the command that is currently
|
2691 |
|
|
* connected, you have to wait for it to complete. If this is
|
2692 |
|
|
* a problem, we could implement longjmp() / setjmp(), setjmp()
|
2693 |
|
|
* called where the loop started in NCR5380_main().
|
2694 |
|
|
*/
|
2695 |
|
|
|
2696 |
|
|
static int NCR5380_abort (Scsi_Cmnd *cmd)
|
2697 |
|
|
{
|
2698 |
|
|
struct Scsi_Host *instance = cmd->host;
|
2699 |
|
|
SETUP_HOSTDATA(instance);
|
2700 |
|
|
Scsi_Cmnd *tmp, **prev;
|
2701 |
|
|
unsigned long flags;
|
2702 |
|
|
|
2703 |
|
|
printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
|
2704 |
|
|
print_Scsi_Cmnd (cmd);
|
2705 |
|
|
|
2706 |
|
|
NCR5380_print_status (instance);
|
2707 |
|
|
|
2708 |
|
|
save_flags(flags);
|
2709 |
|
|
cli();
|
2710 |
|
|
|
2711 |
|
|
ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
|
2712 |
|
|
NCR5380_read(BUS_AND_STATUS_REG),
|
2713 |
|
|
NCR5380_read(STATUS_REG));
|
2714 |
|
|
|
2715 |
|
|
#if 1
|
2716 |
|
|
/*
|
2717 |
|
|
* Case 1 : If the command is the currently executing command,
|
2718 |
|
|
* we'll set the aborted flag and return control so that
|
2719 |
|
|
* information transfer routine can exit cleanly.
|
2720 |
|
|
*/
|
2721 |
|
|
|
2722 |
|
|
if (hostdata->connected == cmd) {
|
2723 |
|
|
|
2724 |
|
|
ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
|
2725 |
|
|
/*
|
2726 |
|
|
* We should perform BSY checking, and make sure we haven't slipped
|
2727 |
|
|
* into BUS FREE.
|
2728 |
|
|
*/
|
2729 |
|
|
|
2730 |
|
|
/* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
|
2731 |
|
|
/*
|
2732 |
|
|
* Since we can't change phases until we've completed the current
|
2733 |
|
|
* handshake, we have to source or sink a byte of data if the current
|
2734 |
|
|
* phase is not MSGOUT.
|
2735 |
|
|
*/
|
2736 |
|
|
|
2737 |
|
|
/*
|
2738 |
|
|
* Return control to the executing NCR drive so we can clear the
|
2739 |
|
|
* aborted flag and get back into our main loop.
|
2740 |
|
|
*/
|
2741 |
|
|
|
2742 |
|
|
if (do_abort(instance) == 0) {
|
2743 |
|
|
hostdata->aborted = 1;
|
2744 |
|
|
hostdata->connected = NULL;
|
2745 |
|
|
cmd->result = DID_ABORT << 16;
|
2746 |
|
|
#ifdef SUPPORT_TAGS
|
2747 |
|
|
cmd_free_tag( cmd );
|
2748 |
|
|
#else
|
2749 |
|
|
hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
|
2750 |
|
|
#endif
|
2751 |
|
|
restore_flags(flags);
|
2752 |
|
|
cmd->scsi_done(cmd);
|
2753 |
|
|
return SCSI_ABORT_SUCCESS;
|
2754 |
|
|
} else {
|
2755 |
|
|
/* restore_flags(flags); */
|
2756 |
|
|
printk("scsi%d: abort of connected command failed!\n", HOSTNO);
|
2757 |
|
|
return SCSI_ABORT_ERROR;
|
2758 |
|
|
}
|
2759 |
|
|
}
|
2760 |
|
|
#endif
|
2761 |
|
|
|
2762 |
|
|
/*
|
2763 |
|
|
* Case 2 : If the command hasn't been issued yet, we simply remove it
|
2764 |
|
|
* from the issue queue.
|
2765 |
|
|
*/
|
2766 |
|
|
for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue),
|
2767 |
|
|
tmp = (Scsi_Cmnd *) hostdata->issue_queue;
|
2768 |
|
|
tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
|
2769 |
|
|
if (cmd == tmp) {
|
2770 |
|
|
REMOVE(5, *prev, tmp, NEXT(tmp));
|
2771 |
|
|
(*prev) = NEXT(tmp);
|
2772 |
|
|
NEXT(tmp) = NULL;
|
2773 |
|
|
tmp->result = DID_ABORT << 16;
|
2774 |
|
|
restore_flags(flags);
|
2775 |
|
|
ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
|
2776 |
|
|
HOSTNO);
|
2777 |
|
|
/* Tagged queuing note: no tag to free here, hasn't been assigned
|
2778 |
|
|
* yet... */
|
2779 |
|
|
tmp->scsi_done(tmp);
|
2780 |
|
|
return SCSI_ABORT_SUCCESS;
|
2781 |
|
|
}
|
2782 |
|
|
|
2783 |
|
|
/*
|
2784 |
|
|
* Case 3 : If any commands are connected, we're going to fail the abort
|
2785 |
|
|
* and let the high level SCSI driver retry at a later time or
|
2786 |
|
|
* issue a reset.
|
2787 |
|
|
*
|
2788 |
|
|
* Timeouts, and therefore aborted commands, will be highly unlikely
|
2789 |
|
|
* and handling them cleanly in this situation would make the common
|
2790 |
|
|
* case of noresets less efficient, and would pollute our code. So,
|
2791 |
|
|
* we fail.
|
2792 |
|
|
*/
|
2793 |
|
|
|
2794 |
|
|
if (hostdata->connected) {
|
2795 |
|
|
restore_flags(flags);
|
2796 |
|
|
ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
|
2797 |
|
|
return SCSI_ABORT_SNOOZE;
|
2798 |
|
|
}
|
2799 |
|
|
|
2800 |
|
|
/*
|
2801 |
|
|
* Case 4: If the command is currently disconnected from the bus, and
|
2802 |
|
|
* there are no connected commands, we reconnect the I_T_L or
|
2803 |
|
|
* I_T_L_Q nexus associated with it, go into message out, and send
|
2804 |
|
|
* an abort message.
|
2805 |
|
|
*
|
2806 |
|
|
* This case is especially ugly. In order to reestablish the nexus, we
|
2807 |
|
|
* need to call NCR5380_select(). The easiest way to implement this
|
2808 |
|
|
* function was to abort if the bus was busy, and let the interrupt
|
2809 |
|
|
* handler triggered on the SEL for reselect take care of lost arbitrations
|
2810 |
|
|
* where necessary, meaning interrupts need to be enabled.
|
2811 |
|
|
*
|
2812 |
|
|
* When interrupts are enabled, the queues may change - so we
|
2813 |
|
|
* can't remove it from the disconnected queue before selecting it
|
2814 |
|
|
* because that could cause a failure in hashing the nexus if that
|
2815 |
|
|
* device reselected.
|
2816 |
|
|
*
|
2817 |
|
|
* Since the queues may change, we can't use the pointers from when we
|
2818 |
|
|
* first locate it.
|
2819 |
|
|
*
|
2820 |
|
|
* So, we must first locate the command, and if NCR5380_select()
|
2821 |
|
|
* succeeds, then issue the abort, relocate the command and remove
|
2822 |
|
|
* it from the disconnected queue.
|
2823 |
|
|
*/
|
2824 |
|
|
|
2825 |
|
|
for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
|
2826 |
|
|
tmp = NEXT(tmp))
|
2827 |
|
|
if (cmd == tmp) {
|
2828 |
|
|
restore_flags(flags);
|
2829 |
|
|
ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
|
2830 |
|
|
|
2831 |
|
|
if (NCR5380_select (instance, cmd, (int) cmd->tag))
|
2832 |
|
|
return SCSI_ABORT_BUSY;
|
2833 |
|
|
|
2834 |
|
|
ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
|
2835 |
|
|
|
2836 |
|
|
do_abort (instance);
|
2837 |
|
|
|
2838 |
|
|
save_flags(flags);
|
2839 |
|
|
cli();
|
2840 |
|
|
for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue),
|
2841 |
|
|
tmp = (Scsi_Cmnd *) hostdata->disconnected_queue;
|
2842 |
|
|
tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
|
2843 |
|
|
if (cmd == tmp) {
|
2844 |
|
|
REMOVE(5, *prev, tmp, NEXT(tmp));
|
2845 |
|
|
*prev = NEXT(tmp);
|
2846 |
|
|
NEXT(tmp) = NULL;
|
2847 |
|
|
tmp->result = DID_ABORT << 16;
|
2848 |
|
|
/* We must unlock the tag/LUN immediately here, since the
|
2849 |
|
|
* target goes to BUS FREE and doesn't send us another
|
2850 |
|
|
* message (COMMAND_COMPLETE or the like)
|
2851 |
|
|
*/
|
2852 |
|
|
#ifdef SUPPORT_TAGS
|
2853 |
|
|
cmd_free_tag( tmp );
|
2854 |
|
|
#else
|
2855 |
|
|
hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
|
2856 |
|
|
#endif
|
2857 |
|
|
restore_flags(flags);
|
2858 |
|
|
tmp->scsi_done(tmp);
|
2859 |
|
|
return SCSI_ABORT_SUCCESS;
|
2860 |
|
|
}
|
2861 |
|
|
}
|
2862 |
|
|
|
2863 |
|
|
/*
|
2864 |
|
|
* Case 5 : If we reached this point, the command was not found in any of
|
2865 |
|
|
* the queues.
|
2866 |
|
|
*
|
2867 |
|
|
* We probably reached this point because of an unlikely race condition
|
2868 |
|
|
* between the command completing successfully and the abortion code,
|
2869 |
|
|
* so we won't panic, but we will notify the user in case something really
|
2870 |
|
|
* broke.
|
2871 |
|
|
*/
|
2872 |
|
|
|
2873 |
|
|
restore_flags(flags);
|
2874 |
|
|
printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
|
2875 |
|
|
KERN_INFO " before abortion\n", HOSTNO);
|
2876 |
|
|
|
2877 |
|
|
return SCSI_ABORT_NOT_RUNNING;
|
2878 |
|
|
}
|
2879 |
|
|
|
2880 |
|
|
|
2881 |
|
|
/*
|
2882 |
|
|
* Function : int NCR5380_reset (Scsi_Cmnd *cmd, unsigned int reset_flags)
|
2883 |
|
|
*
|
2884 |
|
|
* Purpose : reset the SCSI bus.
|
2885 |
|
|
*
|
2886 |
|
|
* Returns : SCSI_RESET_WAKEUP
|
2887 |
|
|
*
|
2888 |
|
|
*/
|
2889 |
|
|
|
2890 |
|
|
static int NCR5380_reset( Scsi_Cmnd *cmd, unsigned int reset_flags)
|
2891 |
|
|
{
|
2892 |
|
|
SETUP_HOSTDATA(cmd->host);
|
2893 |
|
|
int i;
|
2894 |
|
|
unsigned long flags;
|
2895 |
|
|
#if 1
|
2896 |
|
|
Scsi_Cmnd *connected, *disconnected_queue;
|
2897 |
|
|
#endif
|
2898 |
|
|
|
2899 |
|
|
|
2900 |
|
|
NCR5380_print_status (cmd->host);
|
2901 |
|
|
|
2902 |
|
|
/* get in phase */
|
2903 |
|
|
NCR5380_write( TARGET_COMMAND_REG,
|
2904 |
|
|
PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
|
2905 |
|
|
/* assert RST */
|
2906 |
|
|
NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
|
2907 |
|
|
udelay (40);
|
2908 |
|
|
/* reset NCR registers */
|
2909 |
|
|
NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
|
2910 |
|
|
NCR5380_write( MODE_REG, MR_BASE );
|
2911 |
|
|
NCR5380_write( TARGET_COMMAND_REG, 0 );
|
2912 |
|
|
NCR5380_write( SELECT_ENABLE_REG, 0 );
|
2913 |
|
|
/* ++roman: reset interrupt condition! otherwise no interrupts don't get
|
2914 |
|
|
* through anymore ... */
|
2915 |
|
|
(void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
|
2916 |
|
|
|
2917 |
|
|
#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
|
2918 |
|
|
/* XXX see below XXX */
|
2919 |
|
|
|
2920 |
|
|
/* MSch: old-style reset: actually abort all command processing here */
|
2921 |
|
|
|
2922 |
|
|
/* After the reset, there are no more connected or disconnected commands
|
2923 |
|
|
* and no busy units; to avoid problems with re-inserting the commands
|
2924 |
|
|
* into the issue_queue (via scsi_done()), the aborted commands are
|
2925 |
|
|
* remembered in local variables first.
|
2926 |
|
|
*/
|
2927 |
|
|
save_flags(flags);
|
2928 |
|
|
cli();
|
2929 |
|
|
connected = (Scsi_Cmnd *)hostdata->connected;
|
2930 |
|
|
hostdata->connected = NULL;
|
2931 |
|
|
disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
|
2932 |
|
|
hostdata->disconnected_queue = NULL;
|
2933 |
|
|
#ifdef SUPPORT_TAGS
|
2934 |
|
|
free_all_tags();
|
2935 |
|
|
#endif
|
2936 |
|
|
for( i = 0; i < 8; ++i )
|
2937 |
|
|
hostdata->busy[i] = 0;
|
2938 |
|
|
#ifdef REAL_DMA
|
2939 |
|
|
hostdata->dma_len = 0;
|
2940 |
|
|
#endif
|
2941 |
|
|
restore_flags(flags);
|
2942 |
|
|
|
2943 |
|
|
/* In order to tell the mid-level code which commands were aborted,
|
2944 |
|
|
* set the command status to DID_RESET and call scsi_done() !!!
|
2945 |
|
|
* This ultimately aborts processing of these commands in the mid-level.
|
2946 |
|
|
*/
|
2947 |
|
|
|
2948 |
|
|
if ((cmd = connected)) {
|
2949 |
|
|
ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
|
2950 |
|
|
cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
|
2951 |
|
|
cmd->scsi_done( cmd );
|
2952 |
|
|
}
|
2953 |
|
|
|
2954 |
|
|
for (i = 0; (cmd = disconnected_queue); ++i) {
|
2955 |
|
|
disconnected_queue = NEXT(cmd);
|
2956 |
|
|
NEXT(cmd) = NULL;
|
2957 |
|
|
cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
|
2958 |
|
|
cmd->scsi_done( cmd );
|
2959 |
|
|
}
|
2960 |
|
|
if (i > 0)
|
2961 |
|
|
ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
|
2962 |
|
|
|
2963 |
|
|
|
2964 |
|
|
/* since all commands have been explicitly terminated, we need to tell
|
2965 |
|
|
* the midlevel code that the reset was SUCCESSFUL, and there is no
|
2966 |
|
|
* need to 'wake up' the commands by a request_sense
|
2967 |
|
|
*/
|
2968 |
|
|
return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
|
2969 |
|
|
#else /* 1 */
|
2970 |
|
|
|
2971 |
|
|
/* MSch: new-style reset handling: let the mid-level do what it can */
|
2972 |
|
|
|
2973 |
|
|
/* ++guenther: MID-LEVEL IS STILL BROKEN.
|
2974 |
|
|
* Mid-level is supposed to requeue all commands that were active on the
|
2975 |
|
|
* various low-level queues. In fact it does this, but that's not enough
|
2976 |
|
|
* because all these commands are subject to timeout. And if a timeout
|
2977 |
|
|
* happens for any removed command, *_abort() is called but all queues
|
2978 |
|
|
* are now empty. Abort then gives up the falcon lock, which is fatal,
|
2979 |
|
|
* since the mid-level will queue more commands and must have the lock
|
2980 |
|
|
* (it's all happening inside timer interrupt handler!!).
|
2981 |
|
|
* Even worse, abort will return NOT_RUNNING for all those commands not
|
2982 |
|
|
* on any queue, so they won't be retried ...
|
2983 |
|
|
*
|
2984 |
|
|
* Conclusion: either scsi.c disables timeout for all resetted commands
|
2985 |
|
|
* immediately, or we loose! As of linux-2.0.20 it doesn't.
|
2986 |
|
|
*/
|
2987 |
|
|
|
2988 |
|
|
/* After the reset, there are no more connected or disconnected commands
|
2989 |
|
|
* and no busy units; so clear the low-level status here to avoid
|
2990 |
|
|
* conflicts when the mid-level code tries to wake up the affected
|
2991 |
|
|
* commands!
|
2992 |
|
|
*/
|
2993 |
|
|
|
2994 |
|
|
if (hostdata->issue_queue)
|
2995 |
|
|
ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
|
2996 |
|
|
if (hostdata->connected)
|
2997 |
|
|
ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
|
2998 |
|
|
if (hostdata->disconnected_queue)
|
2999 |
|
|
ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
|
3000 |
|
|
|
3001 |
|
|
save_flags(flags);
|
3002 |
|
|
cli();
|
3003 |
|
|
hostdata->issue_queue = NULL;
|
3004 |
|
|
hostdata->connected = NULL;
|
3005 |
|
|
hostdata->disconnected_queue = NULL;
|
3006 |
|
|
#ifdef SUPPORT_TAGS
|
3007 |
|
|
free_all_tags();
|
3008 |
|
|
#endif
|
3009 |
|
|
for( i = 0; i < 8; ++i )
|
3010 |
|
|
hostdata->busy[i] = 0;
|
3011 |
|
|
#ifdef REAL_DMA
|
3012 |
|
|
hostdata->dma_len = 0;
|
3013 |
|
|
#endif
|
3014 |
|
|
restore_flags(flags);
|
3015 |
|
|
|
3016 |
|
|
/* we did no complete reset of all commands, so a wakeup is required */
|
3017 |
|
|
return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
|
3018 |
|
|
#endif /* 1 */
|
3019 |
|
|
}
|
3020 |
|
|
|
3021 |
|
|
/* Local Variables: */
|
3022 |
|
|
/* tab-width: 8 */
|
3023 |
|
|
/* End: */
|