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2987 lines
90 KiB
2987 lines
90 KiB
/*
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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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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_transport_spi.h>
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#if (NDEBUG & NDEBUG_LISTS)
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#define LIST(x, y) \
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do { \
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printk("LINE:%d Adding %p to %p\n", \
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__LINE__, (void*)(x), (void*)(y)); \
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if ((x) == (y)) \
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udelay(5); \
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} while (0)
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#define REMOVE(w, x, y, z) \
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do { \
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printk("LINE:%d Removing: %p->%p %p->%p \n", \
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__LINE__, (void*)(w), (void*)(x), \
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(void*)(y), (void*)(z)); \
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if ((x) == (y)) \
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udelay(5); \
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} while (0)
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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 struct 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 SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
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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)->device->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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* been issued, the host->busy array is still employed, as it is without
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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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* 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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/* -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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typedef struct {
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DECLARE_BITMAP(allocated, MAX_TAGS);
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int nr_allocated;
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int queue_size;
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} TAG_ALLOC;
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static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
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|
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static void __init init_tags(void)
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{
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int target, lun;
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TAG_ALLOC *ta;
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if (!setup_use_tagged_queuing)
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return;
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for (target = 0; target < 8; ++target) {
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for (lun = 0; lun < 8; ++lun) {
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ta = &TagAlloc[target][lun];
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bitmap_zero(ta->allocated, MAX_TAGS);
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ta->nr_allocated = 0;
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/* At the beginning, assume the maximum queue size we could
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* support (MAX_TAGS). This value will be decreased if the target
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* returns QUEUE_FULL status.
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*/
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ta->queue_size = MAX_TAGS;
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}
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}
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}
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|
|
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/* Check if we can issue a command to this LUN: First see if the LUN is marked
|
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* busy by an untagged command. If the command should use tagged queuing, also
|
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* check that there is a free tag and the target's queue won't overflow. This
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* function should be called with interrupts disabled to avoid race
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* conditions.
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*/
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static int is_lun_busy(Scsi_Cmnd *cmd, int should_be_tagged)
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{
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SETUP_HOSTDATA(cmd->device->host);
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if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
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return 1;
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if (!should_be_tagged ||
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!setup_use_tagged_queuing || !cmd->device->tagged_supported)
|
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return 0;
|
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if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
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TagAlloc[cmd->device->id][cmd->device->lun].queue_size) {
|
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TAG_PRINTK("scsi%d: target %d lun %d: no free tags\n",
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H_NO(cmd), cmd->device->id, cmd->device->lun);
|
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return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
|
|
* must be called before!), or reserve the LUN in 'busy' if the command is
|
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* untagged.
|
|
*/
|
|
|
|
static void cmd_get_tag(Scsi_Cmnd *cmd, int should_be_tagged)
|
|
{
|
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SETUP_HOSTDATA(cmd->device->host);
|
|
|
|
/* If we or the target don't support tagged queuing, allocate the LUN for
|
|
* an untagged command.
|
|
*/
|
|
if (!should_be_tagged ||
|
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!setup_use_tagged_queuing || !cmd->device->tagged_supported) {
|
|
cmd->tag = TAG_NONE;
|
|
hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
|
|
TAG_PRINTK("scsi%d: target %d lun %d now allocated by untagged "
|
|
"command\n", H_NO(cmd), cmd->device->id, cmd->device->lun);
|
|
} else {
|
|
TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
|
|
|
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cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS);
|
|
set_bit(cmd->tag, ta->allocated);
|
|
ta->nr_allocated++;
|
|
TAG_PRINTK("scsi%d: using tag %d for target %d lun %d "
|
|
"(now %d tags in use)\n",
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H_NO(cmd), cmd->tag, cmd->device->id,
|
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cmd->device->lun, ta->nr_allocated);
|
|
}
|
|
}
|
|
|
|
|
|
/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
|
|
* unlock the LUN.
|
|
*/
|
|
|
|
static void cmd_free_tag(Scsi_Cmnd *cmd)
|
|
{
|
|
SETUP_HOSTDATA(cmd->device->host);
|
|
|
|
if (cmd->tag == TAG_NONE) {
|
|
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
|
|
TAG_PRINTK("scsi%d: target %d lun %d untagged cmd finished\n",
|
|
H_NO(cmd), cmd->device->id, cmd->device->lun);
|
|
} else if (cmd->tag >= MAX_TAGS) {
|
|
printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
|
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H_NO(cmd), cmd->tag);
|
|
} else {
|
|
TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
|
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clear_bit(cmd->tag, ta->allocated);
|
|
ta->nr_allocated--;
|
|
TAG_PRINTK("scsi%d: freed tag %d for target %d lun %d\n",
|
|
H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun);
|
|
}
|
|
}
|
|
|
|
|
|
static void free_all_tags(void)
|
|
{
|
|
int target, lun;
|
|
TAG_ALLOC *ta;
|
|
|
|
if (!setup_use_tagged_queuing)
|
|
return;
|
|
|
|
for (target = 0; target < 8; ++target) {
|
|
for (lun = 0; lun < 8; ++lun) {
|
|
ta = &TagAlloc[target][lun];
|
|
bitmap_zero(ta->allocated, MAX_TAGS);
|
|
ta->nr_allocated = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* SUPPORT_TAGS */
|
|
|
|
|
|
/*
|
|
* Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
|
|
*
|
|
* Purpose: Try to merge several scatter-gather requests into one DMA
|
|
* transfer. This is possible if the scatter buffers lie on
|
|
* physical contiguous addresses.
|
|
*
|
|
* Parameters: Scsi_Cmnd *cmd
|
|
* The command to work on. The first scatter buffer's data are
|
|
* assumed to be already transfered into ptr/this_residual.
|
|
*/
|
|
|
|
static void merge_contiguous_buffers(Scsi_Cmnd *cmd)
|
|
{
|
|
unsigned long endaddr;
|
|
#if (NDEBUG & NDEBUG_MERGING)
|
|
unsigned long oldlen = cmd->SCp.this_residual;
|
|
int cnt = 1;
|
|
#endif
|
|
|
|
for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
|
|
cmd->SCp.buffers_residual &&
|
|
virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) {
|
|
MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
|
|
page_address(sg_page(&cmd->SCp.buffer[1])), endaddr);
|
|
#if (NDEBUG & NDEBUG_MERGING)
|
|
++cnt;
|
|
#endif
|
|
++cmd->SCp.buffer;
|
|
--cmd->SCp.buffers_residual;
|
|
cmd->SCp.this_residual += cmd->SCp.buffer->length;
|
|
endaddr += cmd->SCp.buffer->length;
|
|
}
|
|
#if (NDEBUG & NDEBUG_MERGING)
|
|
if (oldlen != cmd->SCp.this_residual)
|
|
MER_PRINTK("merged %d buffers from %p, new length %08x\n",
|
|
cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Function : void initialize_SCp(Scsi_Cmnd *cmd)
|
|
*
|
|
* Purpose : initialize the saved data pointers for cmd to point to the
|
|
* start of the buffer.
|
|
*
|
|
* Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
|
|
*/
|
|
|
|
static inline void initialize_SCp(Scsi_Cmnd *cmd)
|
|
{
|
|
/*
|
|
* Initialize the Scsi Pointer field so that all of the commands in the
|
|
* various queues are valid.
|
|
*/
|
|
|
|
if (scsi_bufflen(cmd)) {
|
|
cmd->SCp.buffer = scsi_sglist(cmd);
|
|
cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
|
|
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
|
|
cmd->SCp.this_residual = cmd->SCp.buffer->length;
|
|
/* ++roman: Try to merge some scatter-buffers if they are at
|
|
* contiguous physical addresses.
|
|
*/
|
|
merge_contiguous_buffers(cmd);
|
|
} else {
|
|
cmd->SCp.buffer = NULL;
|
|
cmd->SCp.buffers_residual = 0;
|
|
cmd->SCp.ptr = NULL;
|
|
cmd->SCp.this_residual = 0;
|
|
}
|
|
}
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#if NDEBUG
|
|
static struct {
|
|
unsigned char mask;
|
|
const char *name;
|
|
} signals[] = {
|
|
{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
|
|
{ SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
|
|
{ SR_SEL, "SEL" }, {0, NULL}
|
|
}, basrs[] = {
|
|
{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}
|
|
}, icrs[] = {
|
|
{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
|
|
{ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
|
|
{ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
|
|
{0, NULL}
|
|
}, mrs[] = {
|
|
{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
|
|
{MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
|
|
"MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
|
|
{MR_MONITOR_BSY, "MODE MONITOR BSY"},
|
|
{MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
|
|
{0, NULL}
|
|
};
|
|
|
|
/*
|
|
* Function : void NCR5380_print(struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : print the SCSI bus signals for debugging purposes
|
|
*
|
|
* Input : instance - which NCR5380
|
|
*/
|
|
|
|
static void NCR5380_print(struct Scsi_Host *instance)
|
|
{
|
|
unsigned char status, data, basr, mr, icr, i;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
data = NCR5380_read(CURRENT_SCSI_DATA_REG);
|
|
status = NCR5380_read(STATUS_REG);
|
|
mr = NCR5380_read(MODE_REG);
|
|
icr = NCR5380_read(INITIATOR_COMMAND_REG);
|
|
basr = NCR5380_read(BUS_AND_STATUS_REG);
|
|
local_irq_restore(flags);
|
|
printk("STATUS_REG: %02x ", status);
|
|
for (i = 0; signals[i].mask; ++i)
|
|
if (status & signals[i].mask)
|
|
printk(",%s", signals[i].name);
|
|
printk("\nBASR: %02x ", basr);
|
|
for (i = 0; basrs[i].mask; ++i)
|
|
if (basr & basrs[i].mask)
|
|
printk(",%s", basrs[i].name);
|
|
printk("\nICR: %02x ", icr);
|
|
for (i = 0; icrs[i].mask; ++i)
|
|
if (icr & icrs[i].mask)
|
|
printk(",%s", icrs[i].name);
|
|
printk("\nMODE: %02x ", mr);
|
|
for (i = 0; mrs[i].mask; ++i)
|
|
if (mr & mrs[i].mask)
|
|
printk(",%s", mrs[i].name);
|
|
printk("\n");
|
|
}
|
|
|
|
static struct {
|
|
unsigned char value;
|
|
const char *name;
|
|
} phases[] = {
|
|
{PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
|
|
{PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
|
|
{PHASE_UNKNOWN, "UNKNOWN"}
|
|
};
|
|
|
|
/*
|
|
* Function : void NCR5380_print_phase(struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : print the current SCSI phase for debugging purposes
|
|
*
|
|
* Input : instance - which NCR5380
|
|
*/
|
|
|
|
static void NCR5380_print_phase(struct Scsi_Host *instance)
|
|
{
|
|
unsigned char status;
|
|
int i;
|
|
|
|
status = NCR5380_read(STATUS_REG);
|
|
if (!(status & SR_REQ))
|
|
printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
|
|
else {
|
|
for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
|
|
(phases[i].value != (status & PHASE_MASK)); ++i)
|
|
;
|
|
printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
|
|
}
|
|
}
|
|
|
|
#else /* !NDEBUG */
|
|
|
|
/* dummies... */
|
|
static inline void NCR5380_print(struct Scsi_Host *instance)
|
|
{
|
|
};
|
|
static inline void NCR5380_print_phase(struct Scsi_Host *instance)
|
|
{
|
|
};
|
|
|
|
#endif
|
|
|
|
/*
|
|
* ++roman: New scheme of calling NCR5380_main()
|
|
*
|
|
* If we're not in an interrupt, we can call our main directly, it cannot be
|
|
* already running. Else, we queue it on a task queue, if not 'main_running'
|
|
* tells us that a lower level is already executing it. This way,
|
|
* 'main_running' needs not be protected in a special way.
|
|
*
|
|
* queue_main() is a utility function for putting our main onto the task
|
|
* queue, if main_running is false. It should be called only from a
|
|
* interrupt or bottom half.
|
|
*/
|
|
|
|
#include <linux/workqueue.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
static volatile int main_running;
|
|
static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
|
|
|
|
static inline void queue_main(void)
|
|
{
|
|
if (!main_running) {
|
|
/* If in interrupt and NCR5380_main() not already running,
|
|
queue it on the 'immediate' task queue, to be processed
|
|
immediately after the current interrupt processing has
|
|
finished. */
|
|
schedule_work(&NCR5380_tqueue);
|
|
}
|
|
/* else: nothing to do: the running NCR5380_main() will pick up
|
|
any newly queued command. */
|
|
}
|
|
|
|
|
|
static inline void NCR5380_all_init(void)
|
|
{
|
|
static int done = 0;
|
|
if (!done) {
|
|
INI_PRINTK("scsi : NCR5380_all_init()\n");
|
|
done = 1;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Function : void NCR58380_print_options (struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : called by probe code indicating the NCR5380 driver
|
|
* options that were selected.
|
|
*
|
|
* Inputs : instance, pointer to this instance. Unused.
|
|
*/
|
|
|
|
static void __init NCR5380_print_options(struct Scsi_Host *instance)
|
|
{
|
|
printk(" generic options"
|
|
#ifdef AUTOSENSE
|
|
" AUTOSENSE"
|
|
#endif
|
|
#ifdef REAL_DMA
|
|
" REAL DMA"
|
|
#endif
|
|
#ifdef PARITY
|
|
" PARITY"
|
|
#endif
|
|
#ifdef SUPPORT_TAGS
|
|
" SCSI-2 TAGGED QUEUING"
|
|
#endif
|
|
);
|
|
printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
|
|
}
|
|
|
|
/*
|
|
* Function : void NCR5380_print_status (struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : print commands in the various queues, called from
|
|
* NCR5380_abort and NCR5380_debug to aid debugging.
|
|
*
|
|
* Inputs : instance, pointer to this instance.
|
|
*/
|
|
|
|
static void NCR5380_print_status(struct Scsi_Host *instance)
|
|
{
|
|
char *pr_bfr;
|
|
char *start;
|
|
int len;
|
|
|
|
NCR_PRINT(NDEBUG_ANY);
|
|
NCR_PRINT_PHASE(NDEBUG_ANY);
|
|
|
|
pr_bfr = (char *)__get_free_page(GFP_ATOMIC);
|
|
if (!pr_bfr) {
|
|
printk("NCR5380_print_status: no memory for print buffer\n");
|
|
return;
|
|
}
|
|
len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
|
|
pr_bfr[len] = 0;
|
|
printk("\n%s\n", pr_bfr);
|
|
free_page((unsigned long)pr_bfr);
|
|
}
|
|
|
|
|
|
/******************************************/
|
|
/*
|
|
* /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
|
|
*
|
|
* *buffer: I/O buffer
|
|
* **start: if inout == FALSE pointer into buffer where user read should start
|
|
* offset: current offset
|
|
* length: length of buffer
|
|
* hostno: Scsi_Host host_no
|
|
* inout: TRUE - user is writing; FALSE - user is reading
|
|
*
|
|
* Return the number of bytes read from or written
|
|
*/
|
|
|
|
#undef SPRINTF
|
|
#define SPRINTF(fmt,args...) \
|
|
do { \
|
|
if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
|
|
pos += sprintf(pos, fmt , ## args); \
|
|
} while(0)
|
|
static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
|
|
|
|
static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
|
|
char **start, off_t offset, int length, int inout)
|
|
{
|
|
char *pos = buffer;
|
|
struct NCR5380_hostdata *hostdata;
|
|
Scsi_Cmnd *ptr;
|
|
unsigned long flags;
|
|
off_t begin = 0;
|
|
#define check_offset() \
|
|
do { \
|
|
if (pos - buffer < offset - begin) { \
|
|
begin += pos - buffer; \
|
|
pos = buffer; \
|
|
} \
|
|
} while (0)
|
|
|
|
hostdata = (struct NCR5380_hostdata *)instance->hostdata;
|
|
|
|
if (inout) /* Has data been written to the file ? */
|
|
return -ENOSYS; /* Currently this is a no-op */
|
|
SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
|
|
check_offset();
|
|
local_irq_save(flags);
|
|
SPRINTF("NCR5380: coroutine is%s running.\n",
|
|
main_running ? "" : "n't");
|
|
check_offset();
|
|
if (!hostdata->connected)
|
|
SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
|
|
else
|
|
pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected,
|
|
pos, buffer, length);
|
|
SPRINTF("scsi%d: issue_queue\n", HOSTNO);
|
|
check_offset();
|
|
for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
|
|
pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
|
|
check_offset();
|
|
}
|
|
|
|
SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
|
|
check_offset();
|
|
for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
|
|
ptr = NEXT(ptr)) {
|
|
pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
|
|
check_offset();
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
*start = buffer + (offset - begin);
|
|
if (pos - buffer < offset - begin)
|
|
return 0;
|
|
else if (pos - buffer - (offset - begin) < length)
|
|
return pos - buffer - (offset - begin);
|
|
return length;
|
|
}
|
|
|
|
static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
|
|
{
|
|
int i, s;
|
|
unsigned char *command;
|
|
SPRINTF("scsi%d: destination target %d, lun %d\n",
|
|
H_NO(cmd), cmd->device->id, cmd->device->lun);
|
|
SPRINTF(" command = ");
|
|
command = cmd->cmnd;
|
|
SPRINTF("%2d (0x%02x)", command[0], command[0]);
|
|
for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
|
|
SPRINTF(" %02x", command[i]);
|
|
SPRINTF("\n");
|
|
return pos;
|
|
}
|
|
|
|
|
|
/*
|
|
* Function : void NCR5380_init (struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : initializes *instance and corresponding 5380 chip.
|
|
*
|
|
* Inputs : instance - instantiation of the 5380 driver.
|
|
*
|
|
* Notes : I assume that the host, hostno, and id bits have been
|
|
* set correctly. I don't care about the irq and other fields.
|
|
*
|
|
*/
|
|
|
|
static int NCR5380_init(struct Scsi_Host *instance, int flags)
|
|
{
|
|
int i;
|
|
SETUP_HOSTDATA(instance);
|
|
|
|
NCR5380_all_init();
|
|
|
|
hostdata->aborted = 0;
|
|
hostdata->id_mask = 1 << instance->this_id;
|
|
hostdata->id_higher_mask = 0;
|
|
for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
|
|
if (i > hostdata->id_mask)
|
|
hostdata->id_higher_mask |= i;
|
|
for (i = 0; i < 8; ++i)
|
|
hostdata->busy[i] = 0;
|
|
#ifdef SUPPORT_TAGS
|
|
init_tags();
|
|
#endif
|
|
#if defined (REAL_DMA)
|
|
hostdata->dma_len = 0;
|
|
#endif
|
|
hostdata->targets_present = 0;
|
|
hostdata->connected = NULL;
|
|
hostdata->issue_queue = NULL;
|
|
hostdata->disconnected_queue = NULL;
|
|
hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
|
|
|
|
if (!the_template) {
|
|
the_template = instance->hostt;
|
|
first_instance = instance;
|
|
}
|
|
|
|
#ifndef AUTOSENSE
|
|
if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
|
|
printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
|
|
" without AUTOSENSE option, contingent allegiance conditions may\n"
|
|
" be incorrectly cleared.\n", HOSTNO);
|
|
#endif /* def AUTOSENSE */
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
NCR5380_write(SELECT_ENABLE_REG, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
|
|
* void (*done)(Scsi_Cmnd *))
|
|
*
|
|
* Purpose : enqueues a SCSI command
|
|
*
|
|
* Inputs : cmd - SCSI command, done - function called on completion, with
|
|
* a pointer to the command descriptor.
|
|
*
|
|
* Returns : 0
|
|
*
|
|
* Side effects :
|
|
* cmd is added to the per instance issue_queue, with minor
|
|
* twiddling done to the host specific fields of cmd. If the
|
|
* main coroutine is not running, it is restarted.
|
|
*
|
|
*/
|
|
|
|
static int NCR5380_queue_command(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
|
|
{
|
|
SETUP_HOSTDATA(cmd->device->host);
|
|
Scsi_Cmnd *tmp;
|
|
int oldto;
|
|
unsigned long flags;
|
|
|
|
#if (NDEBUG & NDEBUG_NO_WRITE)
|
|
switch (cmd->cmnd[0]) {
|
|
case WRITE_6:
|
|
case WRITE_10:
|
|
printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
|
|
H_NO(cmd));
|
|
cmd->result = (DID_ERROR << 16);
|
|
done(cmd);
|
|
return 0;
|
|
}
|
|
#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
|
|
|
|
#ifdef NCR5380_STATS
|
|
# if 0
|
|
if (!hostdata->connected && !hostdata->issue_queue &&
|
|
!hostdata->disconnected_queue) {
|
|
hostdata->timebase = jiffies;
|
|
}
|
|
# endif
|
|
# ifdef NCR5380_STAT_LIMIT
|
|
if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
|
|
# endif
|
|
switch (cmd->cmnd[0]) {
|
|
case WRITE:
|
|
case WRITE_6:
|
|
case WRITE_10:
|
|
hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
|
|
hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
|
|
hostdata->pendingw++;
|
|
break;
|
|
case READ:
|
|
case READ_6:
|
|
case READ_10:
|
|
hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
|
|
hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
|
|
hostdata->pendingr++;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* We use the host_scribble field as a pointer to the next command
|
|
* in a queue
|
|
*/
|
|
|
|
SET_NEXT(cmd, NULL);
|
|
cmd->scsi_done = done;
|
|
|
|
cmd->result = 0;
|
|
|
|
/*
|
|
* Insert the cmd into the issue queue. Note that REQUEST SENSE
|
|
* commands are added to the head of the queue since any command will
|
|
* clear the contingent allegiance condition that exists and the
|
|
* sense data is only guaranteed to be valid while the condition exists.
|
|
*/
|
|
|
|
local_irq_save(flags);
|
|
/* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
|
|
* Otherwise a running NCR5380_main may steal the lock.
|
|
* Lock before actually inserting due to fairness reasons explained in
|
|
* atari_scsi.c. If we insert first, then it's impossible for this driver
|
|
* to release the lock.
|
|
* Stop timer for this command while waiting for the lock, or timeouts
|
|
* may happen (and they really do), and it's no good if the command doesn't
|
|
* appear in any of the queues.
|
|
* ++roman: Just disabling the NCR interrupt isn't sufficient here,
|
|
* because also a timer int can trigger an abort or reset, which would
|
|
* alter queues and touch the lock.
|
|
*/
|
|
if (!IS_A_TT()) {
|
|
/* perhaps stop command timer here */
|
|
falcon_get_lock();
|
|
/* perhaps restart command timer here */
|
|
}
|
|
if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
|
|
LIST(cmd, hostdata->issue_queue);
|
|
SET_NEXT(cmd, hostdata->issue_queue);
|
|
hostdata->issue_queue = cmd;
|
|
} else {
|
|
for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
|
|
NEXT(tmp); tmp = NEXT(tmp))
|
|
;
|
|
LIST(cmd, tmp);
|
|
SET_NEXT(tmp, cmd);
|
|
}
|
|
local_irq_restore(flags);
|
|
|
|
QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
|
|
(cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
|
|
|
|
/* If queue_command() is called from an interrupt (real one or bottom
|
|
* half), we let queue_main() do the job of taking care about main. If it
|
|
* is already running, this is a no-op, else main will be queued.
|
|
*
|
|
* If we're not in an interrupt, we can call NCR5380_main()
|
|
* unconditionally, because it cannot be already running.
|
|
*/
|
|
if (in_interrupt() || ((flags >> 8) & 7) >= 6)
|
|
queue_main();
|
|
else
|
|
NCR5380_main(NULL);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function : NCR5380_main (void)
|
|
*
|
|
* Purpose : NCR5380_main is a coroutine that runs as long as more work can
|
|
* be done on the NCR5380 host adapters in a system. Both
|
|
* NCR5380_queue_command() and NCR5380_intr() will try to start it
|
|
* in case it is not running.
|
|
*
|
|
* NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
|
|
* reenable them. This prevents reentrancy and kernel stack overflow.
|
|
*/
|
|
|
|
static void NCR5380_main(struct work_struct *work)
|
|
{
|
|
Scsi_Cmnd *tmp, *prev;
|
|
struct Scsi_Host *instance = first_instance;
|
|
struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
|
|
int done;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* We run (with interrupts disabled) until we're sure that none of
|
|
* the host adapters have anything that can be done, at which point
|
|
* we set main_running to 0 and exit.
|
|
*
|
|
* Interrupts are enabled before doing various other internal
|
|
* instructions, after we've decided that we need to run through
|
|
* the loop again.
|
|
*
|
|
* this should prevent any race conditions.
|
|
*
|
|
* ++roman: Just disabling the NCR interrupt isn't sufficient here,
|
|
* because also a timer int can trigger an abort or reset, which can
|
|
* alter queues and touch the Falcon lock.
|
|
*/
|
|
|
|
/* Tell int handlers main() is now already executing. Note that
|
|
no races are possible here. If an int comes in before
|
|
'main_running' is set here, and queues/executes main via the
|
|
task queue, it doesn't do any harm, just this instance of main
|
|
won't find any work left to do. */
|
|
if (main_running)
|
|
return;
|
|
main_running = 1;
|
|
|
|
local_save_flags(flags);
|
|
do {
|
|
local_irq_disable(); /* Freeze request queues */
|
|
done = 1;
|
|
|
|
if (!hostdata->connected) {
|
|
MAIN_PRINTK("scsi%d: not connected\n", HOSTNO);
|
|
/*
|
|
* Search through the issue_queue for a command destined
|
|
* for a target that's not busy.
|
|
*/
|
|
#if (NDEBUG & NDEBUG_LISTS)
|
|
for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
|
|
tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
|
|
;
|
|
/*printk("%p ", tmp);*/
|
|
if ((tmp == prev) && tmp)
|
|
printk(" LOOP\n");
|
|
/* else printk("\n"); */
|
|
#endif
|
|
for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
|
|
prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
|
|
|
|
#if (NDEBUG & NDEBUG_LISTS)
|
|
if (prev != tmp)
|
|
printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
|
|
tmp, tmp->device->id, hostdata->busy[tmp->device->id],
|
|
tmp->device->lun);
|
|
#endif
|
|
/* When we find one, remove it from the issue queue. */
|
|
/* ++guenther: possible race with Falcon locking */
|
|
if (
|
|
#ifdef SUPPORT_TAGS
|
|
!is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
|
|
#else
|
|
!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
|
|
#endif
|
|
) {
|
|
/* ++guenther: just to be sure, this must be atomic */
|
|
local_irq_disable();
|
|
if (prev) {
|
|
REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
|
|
SET_NEXT(prev, NEXT(tmp));
|
|
} else {
|
|
REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
|
|
hostdata->issue_queue = NEXT(tmp);
|
|
}
|
|
SET_NEXT(tmp, NULL);
|
|
falcon_dont_release++;
|
|
|
|
/* reenable interrupts after finding one */
|
|
local_irq_restore(flags);
|
|
|
|
/*
|
|
* Attempt to establish an I_T_L nexus here.
|
|
* On success, instance->hostdata->connected is set.
|
|
* On failure, we must add the command back to the
|
|
* issue queue so we can keep trying.
|
|
*/
|
|
MAIN_PRINTK("scsi%d: main(): command for target %d "
|
|
"lun %d removed from issue_queue\n",
|
|
HOSTNO, tmp->device->id, tmp->device->lun);
|
|
/*
|
|
* REQUEST SENSE commands are issued without tagged
|
|
* queueing, even on SCSI-II devices because the
|
|
* contingent allegiance condition exists for the
|
|
* entire unit.
|
|
*/
|
|
/* ++roman: ...and the standard also requires that
|
|
* REQUEST SENSE command are untagged.
|
|
*/
|
|
|
|
#ifdef SUPPORT_TAGS
|
|
cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
|
|
#endif
|
|
if (!NCR5380_select(instance, tmp,
|
|
(tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
|
|
TAG_NEXT)) {
|
|
falcon_dont_release--;
|
|
/* release if target did not response! */
|
|
falcon_release_lock_if_possible(hostdata);
|
|
break;
|
|
} else {
|
|
local_irq_disable();
|
|
LIST(tmp, hostdata->issue_queue);
|
|
SET_NEXT(tmp, hostdata->issue_queue);
|
|
hostdata->issue_queue = tmp;
|
|
#ifdef SUPPORT_TAGS
|
|
cmd_free_tag(tmp);
|
|
#endif
|
|
falcon_dont_release--;
|
|
local_irq_restore(flags);
|
|
MAIN_PRINTK("scsi%d: main(): select() failed, "
|
|
"returned to issue_queue\n", HOSTNO);
|
|
if (hostdata->connected)
|
|
break;
|
|
}
|
|
} /* if target/lun/target queue is not busy */
|
|
} /* for issue_queue */
|
|
} /* if (!hostdata->connected) */
|
|
|
|
if (hostdata->connected
|
|
#ifdef REAL_DMA
|
|
&& !hostdata->dma_len
|
|
#endif
|
|
) {
|
|
local_irq_restore(flags);
|
|
MAIN_PRINTK("scsi%d: main: performing information transfer\n",
|
|
HOSTNO);
|
|
NCR5380_information_transfer(instance);
|
|
MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
|
|
done = 0;
|
|
}
|
|
} while (!done);
|
|
|
|
/* Better allow ints _after_ 'main_running' has been cleared, else
|
|
an interrupt could believe we'll pick up the work it left for
|
|
us, but we won't see it anymore here... */
|
|
main_running = 0;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
#ifdef REAL_DMA
|
|
/*
|
|
* Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : Called by interrupt handler when DMA finishes or a phase
|
|
* mismatch occurs (which would finish the DMA transfer).
|
|
*
|
|
* Inputs : instance - this instance of the NCR5380.
|
|
*
|
|
*/
|
|
|
|
static void NCR5380_dma_complete(struct Scsi_Host *instance)
|
|
{
|
|
SETUP_HOSTDATA(instance);
|
|
int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
|
|
unsigned char **data, p;
|
|
volatile int *count;
|
|
|
|
if (!hostdata->connected) {
|
|
printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
|
|
"no connected cmd\n", HOSTNO);
|
|
return;
|
|
}
|
|
|
|
if (atari_read_overruns) {
|
|
p = hostdata->connected->SCp.phase;
|
|
if (p & SR_IO) {
|
|
udelay(10);
|
|
if ((NCR5380_read(BUS_AND_STATUS_REG) &
|
|
(BASR_PHASE_MATCH|BASR_ACK)) ==
|
|
(BASR_PHASE_MATCH|BASR_ACK)) {
|
|
saved_data = NCR5380_read(INPUT_DATA_REG);
|
|
overrun = 1;
|
|
DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO);
|
|
}
|
|
}
|
|
}
|
|
|
|
DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
|
|
HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
|
|
NCR5380_read(STATUS_REG));
|
|
|
|
(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
|
|
hostdata->dma_len = 0;
|
|
|
|
data = (unsigned char **)&hostdata->connected->SCp.ptr;
|
|
count = &hostdata->connected->SCp.this_residual;
|
|
*data += transfered;
|
|
*count -= transfered;
|
|
|
|
if (atari_read_overruns) {
|
|
if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
|
|
cnt = toPIO = atari_read_overruns;
|
|
if (overrun) {
|
|
DMA_PRINTK("Got an input overrun, using saved byte\n");
|
|
*(*data)++ = saved_data;
|
|
(*count)--;
|
|
cnt--;
|
|
toPIO--;
|
|
}
|
|
DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
|
|
NCR5380_transfer_pio(instance, &p, &cnt, data);
|
|
*count -= toPIO - cnt;
|
|
}
|
|
}
|
|
}
|
|
#endif /* REAL_DMA */
|
|
|
|
|
|
/*
|
|
* Function : void NCR5380_intr (int irq)
|
|
*
|
|
* Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
|
|
* from the disconnected queue, and restarting NCR5380_main()
|
|
* as required.
|
|
*
|
|
* Inputs : int irq, irq that caused this interrupt.
|
|
*
|
|
*/
|
|
|
|
static irqreturn_t NCR5380_intr(int irq, void *dev_id)
|
|
{
|
|
struct Scsi_Host *instance = first_instance;
|
|
int done = 1, handled = 0;
|
|
unsigned char basr;
|
|
|
|
INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
|
|
|
|
/* Look for pending interrupts */
|
|
basr = NCR5380_read(BUS_AND_STATUS_REG);
|
|
INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
|
|
/* dispatch to appropriate routine if found and done=0 */
|
|
if (basr & BASR_IRQ) {
|
|
NCR_PRINT(NDEBUG_INTR);
|
|
if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
|
|
done = 0;
|
|
ENABLE_IRQ();
|
|
INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
|
|
NCR5380_reselect(instance);
|
|
(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
} else if (basr & BASR_PARITY_ERROR) {
|
|
INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
|
|
(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
} else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
|
|
INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
|
|
(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
} else {
|
|
/*
|
|
* The rest of the interrupt conditions can occur only during a
|
|
* DMA transfer
|
|
*/
|
|
|
|
#if defined(REAL_DMA)
|
|
/*
|
|
* We should only get PHASE MISMATCH and EOP interrupts if we have
|
|
* DMA enabled, so do a sanity check based on the current setting
|
|
* of the MODE register.
|
|
*/
|
|
|
|
if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
|
|
((basr & BASR_END_DMA_TRANSFER) ||
|
|
!(basr & BASR_PHASE_MATCH))) {
|
|
|
|
INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
|
|
NCR5380_dma_complete( instance );
|
|
done = 0;
|
|
ENABLE_IRQ();
|
|
} else
|
|
#endif /* REAL_DMA */
|
|
{
|
|
/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
|
|
if (basr & BASR_PHASE_MATCH)
|
|
printk(KERN_NOTICE "scsi%d: unknown interrupt, "
|
|
"BASR 0x%x, MR 0x%x, SR 0x%x\n",
|
|
HOSTNO, basr, NCR5380_read(MODE_REG),
|
|
NCR5380_read(STATUS_REG));
|
|
(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
}
|
|
} /* if !(SELECTION || PARITY) */
|
|
handled = 1;
|
|
} /* BASR & IRQ */ else {
|
|
printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
|
|
"BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
|
|
NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
|
|
(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
}
|
|
|
|
if (!done) {
|
|
INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
|
|
/* Put a call to NCR5380_main() on the queue... */
|
|
queue_main();
|
|
}
|
|
return IRQ_RETVAL(handled);
|
|
}
|
|
|
|
#ifdef NCR5380_STATS
|
|
static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd)
|
|
{
|
|
# ifdef NCR5380_STAT_LIMIT
|
|
if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
|
|
# endif
|
|
switch (cmd->cmnd[0]) {
|
|
case WRITE:
|
|
case WRITE_6:
|
|
case WRITE_10:
|
|
hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
|
|
/*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
|
|
hostdata->pendingw--;
|
|
break;
|
|
case READ:
|
|
case READ_6:
|
|
case READ_10:
|
|
hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
|
|
/*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
|
|
hostdata->pendingr--;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
|
|
* int tag);
|
|
*
|
|
* Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
|
|
* including ARBITRATION, SELECTION, and initial message out for
|
|
* IDENTIFY and queue messages.
|
|
*
|
|
* Inputs : instance - instantiation of the 5380 driver on which this
|
|
* target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
|
|
* new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
|
|
* the command that is presently connected.
|
|
*
|
|
* Returns : -1 if selection could not execute for some reason,
|
|
* 0 if selection succeeded or failed because the target
|
|
* did not respond.
|
|
*
|
|
* Side effects :
|
|
* If bus busy, arbitration failed, etc, NCR5380_select() will exit
|
|
* with registers as they should have been on entry - ie
|
|
* SELECT_ENABLE will be set appropriately, the NCR5380
|
|
* will cease to drive any SCSI bus signals.
|
|
*
|
|
* If successful : I_T_L or I_T_L_Q nexus will be established,
|
|
* instance->connected will be set to cmd.
|
|
* SELECT interrupt will be disabled.
|
|
*
|
|
* If failed (no target) : cmd->scsi_done() will be called, and the
|
|
* cmd->result host byte set to DID_BAD_TARGET.
|
|
*/
|
|
|
|
static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
|
|
{
|
|
SETUP_HOSTDATA(instance);
|
|
unsigned char tmp[3], phase;
|
|
unsigned char *data;
|
|
int len;
|
|
unsigned long timeout;
|
|
unsigned long flags;
|
|
|
|
hostdata->restart_select = 0;
|
|
NCR_PRINT(NDEBUG_ARBITRATION);
|
|
ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
|
|
instance->this_id);
|
|
|
|
/*
|
|
* Set the phase bits to 0, otherwise the NCR5380 won't drive the
|
|
* data bus during SELECTION.
|
|
*/
|
|
|
|
local_irq_save(flags);
|
|
if (hostdata->connected) {
|
|
local_irq_restore(flags);
|
|
return -1;
|
|
}
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
|
|
/*
|
|
* Start arbitration.
|
|
*/
|
|
|
|
NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
|
|
NCR5380_write(MODE_REG, MR_ARBITRATE);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
/* Wait for arbitration logic to complete */
|
|
#if defined(NCR_TIMEOUT)
|
|
{
|
|
unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
|
|
|
|
while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
|
|
time_before(jiffies, timeout) && !hostdata->connected)
|
|
;
|
|
if (time_after_eq(jiffies, timeout)) {
|
|
printk("scsi : arbitration timeout at %d\n", __LINE__);
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
return -1;
|
|
}
|
|
}
|
|
#else /* NCR_TIMEOUT */
|
|
while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
|
|
!hostdata->connected)
|
|
;
|
|
#endif
|
|
|
|
ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
|
|
|
|
if (hostdata->connected) {
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
return -1;
|
|
}
|
|
/*
|
|
* The arbitration delay is 2.2us, but this is a minimum and there is
|
|
* no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
|
|
* the integral nature of udelay().
|
|
*
|
|
*/
|
|
|
|
udelay(3);
|
|
|
|
/* Check for lost arbitration */
|
|
if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
|
|
(NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
|
|
(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
|
|
hostdata->connected) {
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
|
|
HOSTNO);
|
|
return -1;
|
|
}
|
|
|
|
/* after/during arbitration, BSY should be asserted.
|
|
IBM DPES-31080 Version S31Q works now */
|
|
/* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
|
|
NCR5380_write(INITIATOR_COMMAND_REG,
|
|
ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
|
|
|
|
if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
|
|
hostdata->connected) {
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
|
|
HOSTNO);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Again, bus clear + bus settle time is 1.2us, however, this is
|
|
* a minimum so we'll udelay ceil(1.2)
|
|
*/
|
|
|
|
#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
|
|
/* ++roman: But some targets (see above :-) seem to need a bit more... */
|
|
udelay(15);
|
|
#else
|
|
udelay(2);
|
|
#endif
|
|
|
|
if (hostdata->connected) {
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
return -1;
|
|
}
|
|
|
|
ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
|
|
|
|
/*
|
|
* Now that we have won arbitration, start Selection process, asserting
|
|
* the host and target ID's on the SCSI bus.
|
|
*/
|
|
|
|
NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
|
|
|
|
/*
|
|
* Raise ATN while SEL is true before BSY goes false from arbitration,
|
|
* since this is the only way to guarantee that we'll get a MESSAGE OUT
|
|
* phase immediately after selection.
|
|
*/
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
|
|
ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
|
|
/*
|
|
* Reselect interrupts must be turned off prior to the dropping of BSY,
|
|
* otherwise we will trigger an interrupt.
|
|
*/
|
|
|
|
if (hostdata->connected) {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
return -1;
|
|
}
|
|
|
|
NCR5380_write(SELECT_ENABLE_REG, 0);
|
|
|
|
/*
|
|
* The initiator shall then wait at least two deskew delays and release
|
|
* the BSY signal.
|
|
*/
|
|
udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
|
|
|
|
/* Reset BSY */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
|
|
ICR_ASSERT_ATN | ICR_ASSERT_SEL));
|
|
|
|
/*
|
|
* Something weird happens when we cease to drive BSY - looks
|
|
* like the board/chip is letting us do another read before the
|
|
* appropriate propagation delay has expired, and we're confusing
|
|
* a BSY signal from ourselves as the target's response to SELECTION.
|
|
*
|
|
* A small delay (the 'C++' frontend breaks the pipeline with an
|
|
* unnecessary jump, making it work on my 386-33/Trantor T128, the
|
|
* tighter 'C' code breaks and requires this) solves the problem -
|
|
* the 1 us delay is arbitrary, and only used because this delay will
|
|
* be the same on other platforms and since it works here, it should
|
|
* work there.
|
|
*
|
|
* wingel suggests that this could be due to failing to wait
|
|
* one deskew delay.
|
|
*/
|
|
|
|
udelay(1);
|
|
|
|
SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
|
|
|
|
/*
|
|
* The SCSI specification calls for a 250 ms timeout for the actual
|
|
* selection.
|
|
*/
|
|
|
|
timeout = jiffies + 25;
|
|
|
|
/*
|
|
* XXX very interesting - we're seeing a bounce where the BSY we
|
|
* asserted is being reflected / still asserted (propagation delay?)
|
|
* and it's detecting as true. Sigh.
|
|
*/
|
|
|
|
#if 0
|
|
/* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
|
|
* IO while SEL is true. But again, there are some disks out the in the
|
|
* world that do that nevertheless. (Somebody claimed that this announces
|
|
* reselection capability of the target.) So we better skip that test and
|
|
* only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
|
|
*/
|
|
|
|
while (time_before(jiffies, timeout) &&
|
|
!(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO)))
|
|
;
|
|
|
|
if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
NCR5380_reselect(instance);
|
|
printk(KERN_ERR "scsi%d: reselection after won arbitration?\n",
|
|
HOSTNO);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
return -1;
|
|
}
|
|
#else
|
|
while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY))
|
|
;
|
|
#endif
|
|
|
|
/*
|
|
* No less than two deskew delays after the initiator detects the
|
|
* BSY signal is true, it shall release the SEL signal and may
|
|
* change the DATA BUS. -wingel
|
|
*/
|
|
|
|
udelay(1);
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
|
|
if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
if (hostdata->targets_present & (1 << cmd->device->id)) {
|
|
printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
|
|
if (hostdata->restart_select)
|
|
printk(KERN_NOTICE "\trestart select\n");
|
|
NCR_PRINT(NDEBUG_ANY);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
return -1;
|
|
}
|
|
cmd->result = DID_BAD_TARGET << 16;
|
|
#ifdef NCR5380_STATS
|
|
collect_stats(hostdata, cmd);
|
|
#endif
|
|
#ifdef SUPPORT_TAGS
|
|
cmd_free_tag(cmd);
|
|
#endif
|
|
cmd->scsi_done(cmd);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
return 0;
|
|
}
|
|
|
|
hostdata->targets_present |= (1 << cmd->device->id);
|
|
|
|
/*
|
|
* Since we followed the SCSI spec, and raised ATN while SEL
|
|
* was true but before BSY was false during selection, the information
|
|
* transfer phase should be a MESSAGE OUT phase so that we can send the
|
|
* IDENTIFY message.
|
|
*
|
|
* If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
|
|
* message (2 bytes) with a tag ID that we increment with every command
|
|
* until it wraps back to 0.
|
|
*
|
|
* XXX - it turns out that there are some broken SCSI-II devices,
|
|
* which claim to support tagged queuing but fail when more than
|
|
* some number of commands are issued at once.
|
|
*/
|
|
|
|
/* Wait for start of REQ/ACK handshake */
|
|
while (!(NCR5380_read(STATUS_REG) & SR_REQ))
|
|
;
|
|
|
|
SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
|
|
HOSTNO, cmd->device->id);
|
|
tmp[0] = IDENTIFY(1, cmd->device->lun);
|
|
|
|
#ifdef SUPPORT_TAGS
|
|
if (cmd->tag != TAG_NONE) {
|
|
tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
|
|
tmp[2] = cmd->tag;
|
|
len = 3;
|
|
} else
|
|
len = 1;
|
|
#else
|
|
len = 1;
|
|
cmd->tag = 0;
|
|
#endif /* SUPPORT_TAGS */
|
|
|
|
/* Send message(s) */
|
|
data = tmp;
|
|
phase = PHASE_MSGOUT;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
|
|
/* XXX need to handle errors here */
|
|
hostdata->connected = cmd;
|
|
#ifndef SUPPORT_TAGS
|
|
hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
|
|
#endif
|
|
|
|
initialize_SCp(cmd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
|
|
* unsigned char *phase, int *count, unsigned char **data)
|
|
*
|
|
* Purpose : transfers data in given phase using polled I/O
|
|
*
|
|
* Inputs : instance - instance of driver, *phase - pointer to
|
|
* what phase is expected, *count - pointer to number of
|
|
* bytes to transfer, **data - pointer to data pointer.
|
|
*
|
|
* Returns : -1 when different phase is entered without transferring
|
|
* maximum number of bytes, 0 if all bytes are transfered or exit
|
|
* is in same phase.
|
|
*
|
|
* Also, *phase, *count, *data are modified in place.
|
|
*
|
|
* XXX Note : handling for bus free may be useful.
|
|
*/
|
|
|
|
/*
|
|
* Note : this code is not as quick as it could be, however it
|
|
* IS 100% reliable, and for the actual data transfer where speed
|
|
* counts, we will always do a pseudo DMA or DMA transfer.
|
|
*/
|
|
|
|
static int NCR5380_transfer_pio(struct Scsi_Host *instance,
|
|
unsigned char *phase, int *count,
|
|
unsigned char **data)
|
|
{
|
|
register unsigned char p = *phase, tmp;
|
|
register int c = *count;
|
|
register unsigned char *d = *data;
|
|
|
|
/*
|
|
* The NCR5380 chip will only drive the SCSI bus when the
|
|
* phase specified in the appropriate bits of the TARGET COMMAND
|
|
* REGISTER match the STATUS REGISTER
|
|
*/
|
|
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
|
|
|
|
do {
|
|
/*
|
|
* Wait for assertion of REQ, after which the phase bits will be
|
|
* valid
|
|
*/
|
|
while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
|
|
;
|
|
|
|
HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
|
|
|
|
/* Check for phase mismatch */
|
|
if ((tmp & PHASE_MASK) != p) {
|
|
PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
|
|
NCR_PRINT_PHASE(NDEBUG_PIO);
|
|
break;
|
|
}
|
|
|
|
/* Do actual transfer from SCSI bus to / from memory */
|
|
if (!(p & SR_IO))
|
|
NCR5380_write(OUTPUT_DATA_REG, *d);
|
|
else
|
|
*d = NCR5380_read(CURRENT_SCSI_DATA_REG);
|
|
|
|
++d;
|
|
|
|
/*
|
|
* The SCSI standard suggests that in MSGOUT phase, the initiator
|
|
* should drop ATN on the last byte of the message phase
|
|
* after REQ has been asserted for the handshake but before
|
|
* the initiator raises ACK.
|
|
*/
|
|
|
|
if (!(p & SR_IO)) {
|
|
if (!((p & SR_MSG) && c > 1)) {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
|
|
NCR_PRINT(NDEBUG_PIO);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
|
ICR_ASSERT_DATA | ICR_ASSERT_ACK);
|
|
} else {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
|
ICR_ASSERT_DATA | ICR_ASSERT_ATN);
|
|
NCR_PRINT(NDEBUG_PIO);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
|
ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
|
|
}
|
|
} else {
|
|
NCR_PRINT(NDEBUG_PIO);
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
|
|
}
|
|
|
|
while (NCR5380_read(STATUS_REG) & SR_REQ)
|
|
;
|
|
|
|
HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
|
|
|
|
/*
|
|
* We have several special cases to consider during REQ/ACK handshaking :
|
|
* 1. We were in MSGOUT phase, and we are on the last byte of the
|
|
* message. ATN must be dropped as ACK is dropped.
|
|
*
|
|
* 2. We are in a MSGIN phase, and we are on the last byte of the
|
|
* message. We must exit with ACK asserted, so that the calling
|
|
* code may raise ATN before dropping ACK to reject the message.
|
|
*
|
|
* 3. ACK and ATN are clear and the target may proceed as normal.
|
|
*/
|
|
if (!(p == PHASE_MSGIN && c == 1)) {
|
|
if (p == PHASE_MSGOUT && c > 1)
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
else
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
}
|
|
} while (--c);
|
|
|
|
PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
|
|
|
|
*count = c;
|
|
*data = d;
|
|
tmp = NCR5380_read(STATUS_REG);
|
|
/* The phase read from the bus is valid if either REQ is (already)
|
|
* asserted or if ACK hasn't been released yet. The latter is the case if
|
|
* we're in MSGIN and all wanted bytes have been received.
|
|
*/
|
|
if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
|
|
*phase = tmp & PHASE_MASK;
|
|
else
|
|
*phase = PHASE_UNKNOWN;
|
|
|
|
if (!c || (*phase == p))
|
|
return 0;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Function : do_abort (Scsi_Host *host)
|
|
*
|
|
* Purpose : abort the currently established nexus. Should only be
|
|
* called from a routine which can drop into a
|
|
*
|
|
* Returns : 0 on success, -1 on failure.
|
|
*/
|
|
|
|
static int do_abort(struct Scsi_Host *host)
|
|
{
|
|
unsigned char tmp, *msgptr, phase;
|
|
int len;
|
|
|
|
/* Request message out phase */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
|
|
/*
|
|
* Wait for the target to indicate a valid phase by asserting
|
|
* REQ. Once this happens, we'll have either a MSGOUT phase
|
|
* and can immediately send the ABORT message, or we'll have some
|
|
* other phase and will have to source/sink data.
|
|
*
|
|
* We really don't care what value was on the bus or what value
|
|
* the target sees, so we just handshake.
|
|
*/
|
|
|
|
while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
|
|
;
|
|
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
|
|
|
|
if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
|
|
ICR_ASSERT_ACK);
|
|
while (NCR5380_read(STATUS_REG) & SR_REQ)
|
|
;
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
}
|
|
|
|
tmp = ABORT;
|
|
msgptr = &tmp;
|
|
len = 1;
|
|
phase = PHASE_MSGOUT;
|
|
NCR5380_transfer_pio(host, &phase, &len, &msgptr);
|
|
|
|
/*
|
|
* If we got here, and the command completed successfully,
|
|
* we're about to go into bus free state.
|
|
*/
|
|
|
|
return len ? -1 : 0;
|
|
}
|
|
|
|
#if defined(REAL_DMA)
|
|
/*
|
|
* Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
|
|
* unsigned char *phase, int *count, unsigned char **data)
|
|
*
|
|
* Purpose : transfers data in given phase using either real
|
|
* or pseudo DMA.
|
|
*
|
|
* Inputs : instance - instance of driver, *phase - pointer to
|
|
* what phase is expected, *count - pointer to number of
|
|
* bytes to transfer, **data - pointer to data pointer.
|
|
*
|
|
* Returns : -1 when different phase is entered without transferring
|
|
* maximum number of bytes, 0 if all bytes or transfered or exit
|
|
* is in same phase.
|
|
*
|
|
* Also, *phase, *count, *data are modified in place.
|
|
*
|
|
*/
|
|
|
|
|
|
static int NCR5380_transfer_dma(struct Scsi_Host *instance,
|
|
unsigned char *phase, int *count,
|
|
unsigned char **data)
|
|
{
|
|
SETUP_HOSTDATA(instance);
|
|
register int c = *count;
|
|
register unsigned char p = *phase;
|
|
register unsigned char *d = *data;
|
|
unsigned char tmp;
|
|
unsigned long flags;
|
|
|
|
if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
|
|
*phase = tmp;
|
|
return -1;
|
|
}
|
|
|
|
if (atari_read_overruns && (p & SR_IO))
|
|
c -= atari_read_overruns;
|
|
|
|
DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
|
|
HOSTNO, (p & SR_IO) ? "reading" : "writing",
|
|
c, (p & SR_IO) ? "to" : "from", d);
|
|
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
|
|
|
|
#ifdef REAL_DMA
|
|
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
|
|
#endif /* def REAL_DMA */
|
|
|
|
if (IS_A_TT()) {
|
|
/* On the Medusa, it is a must to initialize the DMA before
|
|
* starting the NCR. This is also the cleaner way for the TT.
|
|
*/
|
|
local_irq_save(flags);
|
|
hostdata->dma_len = (p & SR_IO) ?
|
|
NCR5380_dma_read_setup(instance, d, c) :
|
|
NCR5380_dma_write_setup(instance, d, c);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
if (p & SR_IO)
|
|
NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
|
|
else {
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
|
|
NCR5380_write(START_DMA_SEND_REG, 0);
|
|
}
|
|
|
|
if (!IS_A_TT()) {
|
|
/* On the Falcon, the DMA setup must be done after the last */
|
|
/* NCR access, else the DMA setup gets trashed!
|
|
*/
|
|
local_irq_save(flags);
|
|
hostdata->dma_len = (p & SR_IO) ?
|
|
NCR5380_dma_read_setup(instance, d, c) :
|
|
NCR5380_dma_write_setup(instance, d, c);
|
|
local_irq_restore(flags);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* defined(REAL_DMA) */
|
|
|
|
/*
|
|
* Function : NCR5380_information_transfer (struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : run through the various SCSI phases and do as the target
|
|
* directs us to. Operates on the currently connected command,
|
|
* instance->connected.
|
|
*
|
|
* Inputs : instance, instance for which we are doing commands
|
|
*
|
|
* Side effects : SCSI things happen, the disconnected queue will be
|
|
* modified if a command disconnects, *instance->connected will
|
|
* change.
|
|
*
|
|
* XXX Note : we need to watch for bus free or a reset condition here
|
|
* to recover from an unexpected bus free condition.
|
|
*/
|
|
|
|
static void NCR5380_information_transfer(struct Scsi_Host *instance)
|
|
{
|
|
SETUP_HOSTDATA(instance);
|
|
unsigned long flags;
|
|
unsigned char msgout = NOP;
|
|
int sink = 0;
|
|
int len;
|
|
#if defined(REAL_DMA)
|
|
int transfersize;
|
|
#endif
|
|
unsigned char *data;
|
|
unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
|
|
Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
|
|
|
|
while (1) {
|
|
tmp = NCR5380_read(STATUS_REG);
|
|
/* We only have a valid SCSI phase when REQ is asserted */
|
|
if (tmp & SR_REQ) {
|
|
phase = (tmp & PHASE_MASK);
|
|
if (phase != old_phase) {
|
|
old_phase = phase;
|
|
NCR_PRINT_PHASE(NDEBUG_INFORMATION);
|
|
}
|
|
|
|
if (sink && (phase != PHASE_MSGOUT)) {
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
|
|
ICR_ASSERT_ACK);
|
|
while (NCR5380_read(STATUS_REG) & SR_REQ)
|
|
;
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
|
ICR_ASSERT_ATN);
|
|
sink = 0;
|
|
continue;
|
|
}
|
|
|
|
switch (phase) {
|
|
case PHASE_DATAOUT:
|
|
#if (NDEBUG & NDEBUG_NO_DATAOUT)
|
|
printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
|
|
"aborted\n", HOSTNO);
|
|
sink = 1;
|
|
do_abort(instance);
|
|
cmd->result = DID_ERROR << 16;
|
|
cmd->scsi_done(cmd);
|
|
return;
|
|
#endif
|
|
case PHASE_DATAIN:
|
|
/*
|
|
* If there is no room left in the current buffer in the
|
|
* scatter-gather list, move onto the next one.
|
|
*/
|
|
|
|
if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
|
|
++cmd->SCp.buffer;
|
|
--cmd->SCp.buffers_residual;
|
|
cmd->SCp.this_residual = cmd->SCp.buffer->length;
|
|
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
|
|
/* ++roman: Try to merge some scatter-buffers if
|
|
* they are at contiguous physical addresses.
|
|
*/
|
|
merge_contiguous_buffers(cmd);
|
|
INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
|
|
HOSTNO, cmd->SCp.this_residual,
|
|
cmd->SCp.buffers_residual);
|
|
}
|
|
|
|
/*
|
|
* The preferred transfer method is going to be
|
|
* PSEUDO-DMA for systems that are strictly PIO,
|
|
* since we can let the hardware do the handshaking.
|
|
*
|
|
* For this to work, we need to know the transfersize
|
|
* ahead of time, since the pseudo-DMA code will sit
|
|
* in an unconditional loop.
|
|
*/
|
|
|
|
/* ++roman: I suggest, this should be
|
|
* #if def(REAL_DMA)
|
|
* instead of leaving REAL_DMA out.
|
|
*/
|
|
|
|
#if defined(REAL_DMA)
|
|
if (!cmd->device->borken &&
|
|
(transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
|
|
len = transfersize;
|
|
cmd->SCp.phase = phase;
|
|
if (NCR5380_transfer_dma(instance, &phase,
|
|
&len, (unsigned char **)&cmd->SCp.ptr)) {
|
|
/*
|
|
* If the watchdog timer fires, all future
|
|
* accesses to this device will use the
|
|
* polled-IO. */
|
|
printk(KERN_NOTICE "scsi%d: switching target %d "
|
|
"lun %d to slow handshake\n", HOSTNO,
|
|
cmd->device->id, cmd->device->lun);
|
|
cmd->device->borken = 1;
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
|
|
ICR_ASSERT_ATN);
|
|
sink = 1;
|
|
do_abort(instance);
|
|
cmd->result = DID_ERROR << 16;
|
|
cmd->scsi_done(cmd);
|
|
/* XXX - need to source or sink data here, as appropriate */
|
|
} else {
|
|
#ifdef REAL_DMA
|
|
/* ++roman: When using real DMA,
|
|
* information_transfer() should return after
|
|
* starting DMA since it has nothing more to
|
|
* do.
|
|
*/
|
|
return;
|
|
#else
|
|
cmd->SCp.this_residual -= transfersize - len;
|
|
#endif
|
|
}
|
|
} else
|
|
#endif /* defined(REAL_DMA) */
|
|
NCR5380_transfer_pio(instance, &phase,
|
|
(int *)&cmd->SCp.this_residual,
|
|
(unsigned char **)&cmd->SCp.ptr);
|
|
break;
|
|
case PHASE_MSGIN:
|
|
len = 1;
|
|
data = &tmp;
|
|
NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
cmd->SCp.Message = tmp;
|
|
|
|
switch (tmp) {
|
|
/*
|
|
* Linking lets us reduce the time required to get the
|
|
* next command out to the device, hopefully this will
|
|
* mean we don't waste another revolution due to the delays
|
|
* required by ARBITRATION and another SELECTION.
|
|
*
|
|
* In the current implementation proposal, low level drivers
|
|
* merely have to start the next command, pointed to by
|
|
* next_link, done() is called as with unlinked commands.
|
|
*/
|
|
#ifdef LINKED
|
|
case LINKED_CMD_COMPLETE:
|
|
case LINKED_FLG_CMD_COMPLETE:
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
LNK_PRINTK("scsi%d: target %d lun %d linked command "
|
|
"complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
|
|
|
|
/* Enable reselect interrupts */
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
/*
|
|
* Sanity check : A linked command should only terminate
|
|
* with one of these messages if there are more linked
|
|
* commands available.
|
|
*/
|
|
|
|
if (!cmd->next_link) {
|
|
printk(KERN_NOTICE "scsi%d: target %d lun %d "
|
|
"linked command complete, no next_link\n",
|
|
HOSTNO, cmd->device->id, cmd->device->lun);
|
|
sink = 1;
|
|
do_abort(instance);
|
|
return;
|
|
}
|
|
|
|
initialize_SCp(cmd->next_link);
|
|
/* The next command is still part of this process; copy it
|
|
* and don't free it! */
|
|
cmd->next_link->tag = cmd->tag;
|
|
cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
|
|
LNK_PRINTK("scsi%d: target %d lun %d linked request "
|
|
"done, calling scsi_done().\n",
|
|
HOSTNO, cmd->device->id, cmd->device->lun);
|
|
#ifdef NCR5380_STATS
|
|
collect_stats(hostdata, cmd);
|
|
#endif
|
|
cmd->scsi_done(cmd);
|
|
cmd = hostdata->connected;
|
|
break;
|
|
#endif /* def LINKED */
|
|
case ABORT:
|
|
case COMMAND_COMPLETE:
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
/* ++guenther: possible race with Falcon locking */
|
|
falcon_dont_release++;
|
|
hostdata->connected = NULL;
|
|
QU_PRINTK("scsi%d: command for target %d, lun %d "
|
|
"completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
|
|
#ifdef SUPPORT_TAGS
|
|
cmd_free_tag(cmd);
|
|
if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
|
|
/* Turn a QUEUE FULL status into BUSY, I think the
|
|
* mid level cannot handle QUEUE FULL :-( (The
|
|
* command is retried after BUSY). Also update our
|
|
* queue size to the number of currently issued
|
|
* commands now.
|
|
*/
|
|
/* ++Andreas: the mid level code knows about
|
|
QUEUE_FULL now. */
|
|
TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
|
|
TAG_PRINTK("scsi%d: target %d lun %d returned "
|
|
"QUEUE_FULL after %d commands\n",
|
|
HOSTNO, cmd->device->id, cmd->device->lun,
|
|
ta->nr_allocated);
|
|
if (ta->queue_size > ta->nr_allocated)
|
|
ta->nr_allocated = ta->queue_size;
|
|
}
|
|
#else
|
|
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
|
|
#endif
|
|
/* Enable reselect interrupts */
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
|
|
/*
|
|
* I'm not sure what the correct thing to do here is :
|
|
*
|
|
* If the command that just executed is NOT a request
|
|
* sense, the obvious thing to do is to set the result
|
|
* code to the values of the stored parameters.
|
|
*
|
|
* If it was a REQUEST SENSE command, we need some way to
|
|
* differentiate between the failure code of the original
|
|
* and the failure code of the REQUEST sense - the obvious
|
|
* case is success, where we fall through and leave the
|
|
* result code unchanged.
|
|
*
|
|
* The non-obvious place is where the REQUEST SENSE failed
|
|
*/
|
|
|
|
if (cmd->cmnd[0] != REQUEST_SENSE)
|
|
cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
|
|
else if (status_byte(cmd->SCp.Status) != GOOD)
|
|
cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
|
|
|
|
#ifdef AUTOSENSE
|
|
if ((cmd->cmnd[0] == REQUEST_SENSE) &&
|
|
hostdata->ses.cmd_len) {
|
|
scsi_eh_restore_cmnd(cmd, &hostdata->ses);
|
|
hostdata->ses.cmd_len = 0 ;
|
|
}
|
|
|
|
if ((cmd->cmnd[0] != REQUEST_SENSE) &&
|
|
(status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
|
|
scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
|
|
|
|
ASEN_PRINTK("scsi%d: performing request sense\n", HOSTNO);
|
|
|
|
local_irq_save(flags);
|
|
LIST(cmd,hostdata->issue_queue);
|
|
SET_NEXT(cmd, hostdata->issue_queue);
|
|
hostdata->issue_queue = (Scsi_Cmnd *) cmd;
|
|
local_irq_restore(flags);
|
|
QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
|
|
"issue queue\n", H_NO(cmd));
|
|
} else
|
|
#endif /* def AUTOSENSE */
|
|
{
|
|
#ifdef NCR5380_STATS
|
|
collect_stats(hostdata, cmd);
|
|
#endif
|
|
cmd->scsi_done(cmd);
|
|
}
|
|
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
/*
|
|
* Restore phase bits to 0 so an interrupted selection,
|
|
* arbitration can resume.
|
|
*/
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
|
|
while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
|
|
barrier();
|
|
|
|
falcon_dont_release--;
|
|
/* ++roman: For Falcon SCSI, release the lock on the
|
|
* ST-DMA here if no other commands are waiting on the
|
|
* disconnected queue.
|
|
*/
|
|
falcon_release_lock_if_possible(hostdata);
|
|
return;
|
|
case MESSAGE_REJECT:
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
/* Enable reselect interrupts */
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
switch (hostdata->last_message) {
|
|
case HEAD_OF_QUEUE_TAG:
|
|
case ORDERED_QUEUE_TAG:
|
|
case SIMPLE_QUEUE_TAG:
|
|
/* The target obviously doesn't support tagged
|
|
* queuing, even though it announced this ability in
|
|
* its INQUIRY data ?!? (maybe only this LUN?) Ok,
|
|
* clear 'tagged_supported' and lock the LUN, since
|
|
* the command is treated as untagged further on.
|
|
*/
|
|
cmd->device->tagged_supported = 0;
|
|
hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
|
|
cmd->tag = TAG_NONE;
|
|
TAG_PRINTK("scsi%d: target %d lun %d rejected "
|
|
"QUEUE_TAG message; tagged queuing "
|
|
"disabled\n",
|
|
HOSTNO, cmd->device->id, cmd->device->lun);
|
|
break;
|
|
}
|
|
break;
|
|
case DISCONNECT:
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
local_irq_save(flags);
|
|
cmd->device->disconnect = 1;
|
|
LIST(cmd,hostdata->disconnected_queue);
|
|
SET_NEXT(cmd, hostdata->disconnected_queue);
|
|
hostdata->connected = NULL;
|
|
hostdata->disconnected_queue = cmd;
|
|
local_irq_restore(flags);
|
|
QU_PRINTK("scsi%d: command for target %d lun %d was "
|
|
"moved from connected to the "
|
|
"disconnected_queue\n", HOSTNO,
|
|
cmd->device->id, cmd->device->lun);
|
|
/*
|
|
* Restore phase bits to 0 so an interrupted selection,
|
|
* arbitration can resume.
|
|
*/
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
|
|
/* Enable reselect interrupts */
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
/* Wait for bus free to avoid nasty timeouts */
|
|
while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
|
|
barrier();
|
|
return;
|
|
/*
|
|
* The SCSI data pointer is *IMPLICITLY* saved on a disconnect
|
|
* operation, in violation of the SCSI spec so we can safely
|
|
* ignore SAVE/RESTORE pointers calls.
|
|
*
|
|
* Unfortunately, some disks violate the SCSI spec and
|
|
* don't issue the required SAVE_POINTERS message before
|
|
* disconnecting, and we have to break spec to remain
|
|
* compatible.
|
|
*/
|
|
case SAVE_POINTERS:
|
|
case RESTORE_POINTERS:
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
/* Enable reselect interrupts */
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
break;
|
|
case EXTENDED_MESSAGE:
|
|
/*
|
|
* Extended messages are sent in the following format :
|
|
* Byte
|
|
* 0 EXTENDED_MESSAGE == 1
|
|
* 1 length (includes one byte for code, doesn't
|
|
* include first two bytes)
|
|
* 2 code
|
|
* 3..length+1 arguments
|
|
*
|
|
* Start the extended message buffer with the EXTENDED_MESSAGE
|
|
* byte, since spi_print_msg() wants the whole thing.
|
|
*/
|
|
extended_msg[0] = EXTENDED_MESSAGE;
|
|
/* Accept first byte by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
|
|
|
|
len = 2;
|
|
data = extended_msg + 1;
|
|
phase = PHASE_MSGIN;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
|
|
(int)extended_msg[1], (int)extended_msg[2]);
|
|
|
|
if (!len && extended_msg[1] <=
|
|
(sizeof(extended_msg) - 1)) {
|
|
/* Accept third byte by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
len = extended_msg[1] - 1;
|
|
data = extended_msg + 3;
|
|
phase = PHASE_MSGIN;
|
|
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
EXT_PRINTK("scsi%d: message received, residual %d\n",
|
|
HOSTNO, len);
|
|
|
|
switch (extended_msg[2]) {
|
|
case EXTENDED_SDTR:
|
|
case EXTENDED_WDTR:
|
|
case EXTENDED_MODIFY_DATA_POINTER:
|
|
case EXTENDED_EXTENDED_IDENTIFY:
|
|
tmp = 0;
|
|
}
|
|
} else if (len) {
|
|
printk(KERN_NOTICE "scsi%d: error receiving "
|
|
"extended message\n", HOSTNO);
|
|
tmp = 0;
|
|
} else {
|
|
printk(KERN_NOTICE "scsi%d: extended message "
|
|
"code %02x length %d is too long\n",
|
|
HOSTNO, extended_msg[2], extended_msg[1]);
|
|
tmp = 0;
|
|
}
|
|
/* Fall through to reject message */
|
|
|
|
/*
|
|
* If we get something weird that we aren't expecting,
|
|
* reject it.
|
|
*/
|
|
default:
|
|
if (!tmp) {
|
|
printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
|
|
spi_print_msg(extended_msg);
|
|
printk("\n");
|
|
} else if (tmp != EXTENDED_MESSAGE)
|
|
printk(KERN_DEBUG "scsi%d: rejecting unknown "
|
|
"message %02x from target %d, lun %d\n",
|
|
HOSTNO, tmp, cmd->device->id, cmd->device->lun);
|
|
else
|
|
printk(KERN_DEBUG "scsi%d: rejecting unknown "
|
|
"extended message "
|
|
"code %02x, length %d from target %d, lun %d\n",
|
|
HOSTNO, extended_msg[1], extended_msg[0],
|
|
cmd->device->id, cmd->device->lun);
|
|
|
|
|
|
msgout = MESSAGE_REJECT;
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
|
break;
|
|
} /* switch (tmp) */
|
|
break;
|
|
case PHASE_MSGOUT:
|
|
len = 1;
|
|
data = &msgout;
|
|
hostdata->last_message = msgout;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
if (msgout == ABORT) {
|
|
#ifdef SUPPORT_TAGS
|
|
cmd_free_tag(cmd);
|
|
#else
|
|
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
|
|
#endif
|
|
hostdata->connected = NULL;
|
|
cmd->result = DID_ERROR << 16;
|
|
#ifdef NCR5380_STATS
|
|
collect_stats(hostdata, cmd);
|
|
#endif
|
|
cmd->scsi_done(cmd);
|
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
|
falcon_release_lock_if_possible(hostdata);
|
|
return;
|
|
}
|
|
msgout = NOP;
|
|
break;
|
|
case PHASE_CMDOUT:
|
|
len = cmd->cmd_len;
|
|
data = cmd->cmnd;
|
|
/*
|
|
* XXX for performance reasons, on machines with a
|
|
* PSEUDO-DMA architecture we should probably
|
|
* use the dma transfer function.
|
|
*/
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
break;
|
|
case PHASE_STATIN:
|
|
len = 1;
|
|
data = &tmp;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
cmd->SCp.Status = tmp;
|
|
break;
|
|
default:
|
|
printk("scsi%d: unknown phase\n", HOSTNO);
|
|
NCR_PRINT(NDEBUG_ANY);
|
|
} /* switch(phase) */
|
|
} /* if (tmp * SR_REQ) */
|
|
} /* while (1) */
|
|
}
|
|
|
|
/*
|
|
* Function : void NCR5380_reselect (struct Scsi_Host *instance)
|
|
*
|
|
* Purpose : does reselection, initializing the instance->connected
|
|
* field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
|
|
* nexus has been reestablished,
|
|
*
|
|
* Inputs : instance - this instance of the NCR5380.
|
|
*
|
|
*/
|
|
|
|
|
|
static void NCR5380_reselect(struct Scsi_Host *instance)
|
|
{
|
|
SETUP_HOSTDATA(instance);
|
|
unsigned char target_mask;
|
|
unsigned char lun, phase;
|
|
int len;
|
|
#ifdef SUPPORT_TAGS
|
|
unsigned char tag;
|
|
#endif
|
|
unsigned char msg[3];
|
|
unsigned char *data;
|
|
Scsi_Cmnd *tmp = NULL, *prev;
|
|
/* unsigned long flags; */
|
|
|
|
/*
|
|
* Disable arbitration, etc. since the host adapter obviously
|
|
* lost, and tell an interrupted NCR5380_select() to restart.
|
|
*/
|
|
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
hostdata->restart_select = 1;
|
|
|
|
target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
|
|
|
|
RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
|
|
|
|
/*
|
|
* At this point, we have detected that our SCSI ID is on the bus,
|
|
* SEL is true and BSY was false for at least one bus settle delay
|
|
* (400 ns).
|
|
*
|
|
* We must assert BSY ourselves, until the target drops the SEL
|
|
* signal.
|
|
*/
|
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
|
|
|
|
while (NCR5380_read(STATUS_REG) & SR_SEL)
|
|
;
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
/*
|
|
* Wait for target to go into MSGIN.
|
|
*/
|
|
|
|
while (!(NCR5380_read(STATUS_REG) & SR_REQ))
|
|
;
|
|
|
|
len = 1;
|
|
data = msg;
|
|
phase = PHASE_MSGIN;
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data);
|
|
|
|
if (!(msg[0] & 0x80)) {
|
|
printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
|
|
spi_print_msg(msg);
|
|
do_abort(instance);
|
|
return;
|
|
}
|
|
lun = (msg[0] & 0x07);
|
|
|
|
#ifdef SUPPORT_TAGS
|
|
/* If the phase is still MSGIN, the target wants to send some more
|
|
* messages. In case it supports tagged queuing, this is probably a
|
|
* SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
|
|
*/
|
|
tag = TAG_NONE;
|
|
if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
|
|
/* Accept previous IDENTIFY message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
len = 2;
|
|
data = msg + 1;
|
|
if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
|
|
msg[1] == SIMPLE_QUEUE_TAG)
|
|
tag = msg[2];
|
|
TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
|
|
"reselection\n", HOSTNO, target_mask, lun, tag);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Find the command corresponding to the I_T_L or I_T_L_Q nexus we
|
|
* just reestablished, and remove it from the disconnected queue.
|
|
*/
|
|
|
|
for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
|
|
tmp; prev = tmp, tmp = NEXT(tmp)) {
|
|
if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
|
|
#ifdef SUPPORT_TAGS
|
|
&& (tag == tmp->tag)
|
|
#endif
|
|
) {
|
|
/* ++guenther: prevent race with falcon_release_lock */
|
|
falcon_dont_release++;
|
|
if (prev) {
|
|
REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
|
|
SET_NEXT(prev, NEXT(tmp));
|
|
} else {
|
|
REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
|
|
hostdata->disconnected_queue = NEXT(tmp);
|
|
}
|
|
SET_NEXT(tmp, NULL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!tmp) {
|
|
printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
|
|
#ifdef SUPPORT_TAGS
|
|
"tag %d "
|
|
#endif
|
|
"not in disconnected_queue.\n",
|
|
HOSTNO, target_mask, lun
|
|
#ifdef SUPPORT_TAGS
|
|
, tag
|
|
#endif
|
|
);
|
|
/*
|
|
* Since we have an established nexus that we can't do anything
|
|
* with, we must abort it.
|
|
*/
|
|
do_abort(instance);
|
|
return;
|
|
}
|
|
|
|
/* Accept message by clearing ACK */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
|
|
hostdata->connected = tmp;
|
|
RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
|
|
HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
|
|
falcon_dont_release--;
|
|
}
|
|
|
|
|
|
/*
|
|
* Function : int NCR5380_abort (Scsi_Cmnd *cmd)
|
|
*
|
|
* Purpose : abort a command
|
|
*
|
|
* Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
|
|
* host byte of the result field to, if zero DID_ABORTED is
|
|
* used.
|
|
*
|
|
* Returns : 0 - success, -1 on failure.
|
|
*
|
|
* XXX - there is no way to abort the command that is currently
|
|
* connected, you have to wait for it to complete. If this is
|
|
* a problem, we could implement longjmp() / setjmp(), setjmp()
|
|
* called where the loop started in NCR5380_main().
|
|
*/
|
|
|
|
static
|
|
int NCR5380_abort(Scsi_Cmnd *cmd)
|
|
{
|
|
struct Scsi_Host *instance = cmd->device->host;
|
|
SETUP_HOSTDATA(instance);
|
|
Scsi_Cmnd *tmp, **prev;
|
|
unsigned long flags;
|
|
|
|
printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
|
|
scsi_print_command(cmd);
|
|
|
|
NCR5380_print_status(instance);
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (!IS_A_TT() && !falcon_got_lock)
|
|
printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
|
|
HOSTNO);
|
|
|
|
ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
|
|
NCR5380_read(BUS_AND_STATUS_REG),
|
|
NCR5380_read(STATUS_REG));
|
|
|
|
#if 1
|
|
/*
|
|
* Case 1 : If the command is the currently executing command,
|
|
* we'll set the aborted flag and return control so that
|
|
* information transfer routine can exit cleanly.
|
|
*/
|
|
|
|
if (hostdata->connected == cmd) {
|
|
|
|
ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
|
|
/*
|
|
* We should perform BSY checking, and make sure we haven't slipped
|
|
* into BUS FREE.
|
|
*/
|
|
|
|
/* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
|
|
/*
|
|
* Since we can't change phases until we've completed the current
|
|
* handshake, we have to source or sink a byte of data if the current
|
|
* phase is not MSGOUT.
|
|
*/
|
|
|
|
/*
|
|
* Return control to the executing NCR drive so we can clear the
|
|
* aborted flag and get back into our main loop.
|
|
*/
|
|
|
|
if (do_abort(instance) == 0) {
|
|
hostdata->aborted = 1;
|
|
hostdata->connected = NULL;
|
|
cmd->result = DID_ABORT << 16;
|
|
#ifdef SUPPORT_TAGS
|
|
cmd_free_tag(cmd);
|
|
#else
|
|
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
|
|
#endif
|
|
local_irq_restore(flags);
|
|
cmd->scsi_done(cmd);
|
|
falcon_release_lock_if_possible(hostdata);
|
|
return SCSI_ABORT_SUCCESS;
|
|
} else {
|
|
/* local_irq_restore(flags); */
|
|
printk("scsi%d: abort of connected command failed!\n", HOSTNO);
|
|
return SCSI_ABORT_ERROR;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Case 2 : If the command hasn't been issued yet, we simply remove it
|
|
* from the issue queue.
|
|
*/
|
|
for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue),
|
|
tmp = (Scsi_Cmnd *)hostdata->issue_queue;
|
|
tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
|
|
if (cmd == tmp) {
|
|
REMOVE(5, *prev, tmp, NEXT(tmp));
|
|
(*prev) = NEXT(tmp);
|
|
SET_NEXT(tmp, NULL);
|
|
tmp->result = DID_ABORT << 16;
|
|
local_irq_restore(flags);
|
|
ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
|
|
HOSTNO);
|
|
/* Tagged queuing note: no tag to free here, hasn't been assigned
|
|
* yet... */
|
|
tmp->scsi_done(tmp);
|
|
falcon_release_lock_if_possible(hostdata);
|
|
return SCSI_ABORT_SUCCESS;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Case 3 : If any commands are connected, we're going to fail the abort
|
|
* and let the high level SCSI driver retry at a later time or
|
|
* issue a reset.
|
|
*
|
|
* Timeouts, and therefore aborted commands, will be highly unlikely
|
|
* and handling them cleanly in this situation would make the common
|
|
* case of noresets less efficient, and would pollute our code. So,
|
|
* we fail.
|
|
*/
|
|
|
|
if (hostdata->connected) {
|
|
local_irq_restore(flags);
|
|
ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
|
|
return SCSI_ABORT_SNOOZE;
|
|
}
|
|
|
|
/*
|
|
* Case 4: If the command is currently disconnected from the bus, and
|
|
* there are no connected commands, we reconnect the I_T_L or
|
|
* I_T_L_Q nexus associated with it, go into message out, and send
|
|
* an abort message.
|
|
*
|
|
* This case is especially ugly. In order to reestablish the nexus, we
|
|
* need to call NCR5380_select(). The easiest way to implement this
|
|
* function was to abort if the bus was busy, and let the interrupt
|
|
* handler triggered on the SEL for reselect take care of lost arbitrations
|
|
* where necessary, meaning interrupts need to be enabled.
|
|
*
|
|
* When interrupts are enabled, the queues may change - so we
|
|
* can't remove it from the disconnected queue before selecting it
|
|
* because that could cause a failure in hashing the nexus if that
|
|
* device reselected.
|
|
*
|
|
* Since the queues may change, we can't use the pointers from when we
|
|
* first locate it.
|
|
*
|
|
* So, we must first locate the command, and if NCR5380_select()
|
|
* succeeds, then issue the abort, relocate the command and remove
|
|
* it from the disconnected queue.
|
|
*/
|
|
|
|
for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
|
|
tmp = NEXT(tmp)) {
|
|
if (cmd == tmp) {
|
|
local_irq_restore(flags);
|
|
ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
|
|
|
|
if (NCR5380_select(instance, cmd, (int)cmd->tag))
|
|
return SCSI_ABORT_BUSY;
|
|
|
|
ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
|
|
|
|
do_abort(instance);
|
|
|
|
local_irq_save(flags);
|
|
for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue),
|
|
tmp = (Scsi_Cmnd *)hostdata->disconnected_queue;
|
|
tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
|
|
if (cmd == tmp) {
|
|
REMOVE(5, *prev, tmp, NEXT(tmp));
|
|
*prev = NEXT(tmp);
|
|
SET_NEXT(tmp, NULL);
|
|
tmp->result = DID_ABORT << 16;
|
|
/* We must unlock the tag/LUN immediately here, since the
|
|
* target goes to BUS FREE and doesn't send us another
|
|
* message (COMMAND_COMPLETE or the like)
|
|
*/
|
|
#ifdef SUPPORT_TAGS
|
|
cmd_free_tag(tmp);
|
|
#else
|
|
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
|
|
#endif
|
|
local_irq_restore(flags);
|
|
tmp->scsi_done(tmp);
|
|
falcon_release_lock_if_possible(hostdata);
|
|
return SCSI_ABORT_SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Case 5 : If we reached this point, the command was not found in any of
|
|
* the queues.
|
|
*
|
|
* We probably reached this point because of an unlikely race condition
|
|
* between the command completing successfully and the abortion code,
|
|
* so we won't panic, but we will notify the user in case something really
|
|
* broke.
|
|
*/
|
|
|
|
local_irq_restore(flags);
|
|
printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
|
|
KERN_INFO " before abortion\n", HOSTNO);
|
|
|
|
/* Maybe it is sufficient just to release the ST-DMA lock... (if
|
|
* possible at all) At least, we should check if the lock could be
|
|
* released after the abort, in case it is kept due to some bug.
|
|
*/
|
|
falcon_release_lock_if_possible(hostdata);
|
|
|
|
return SCSI_ABORT_NOT_RUNNING;
|
|
}
|
|
|
|
|
|
/*
|
|
* Function : int NCR5380_reset (Scsi_Cmnd *cmd)
|
|
*
|
|
* Purpose : reset the SCSI bus.
|
|
*
|
|
* Returns : SCSI_RESET_WAKEUP
|
|
*
|
|
*/
|
|
|
|
static int NCR5380_bus_reset(Scsi_Cmnd *cmd)
|
|
{
|
|
SETUP_HOSTDATA(cmd->device->host);
|
|
int i;
|
|
unsigned long flags;
|
|
#if 1
|
|
Scsi_Cmnd *connected, *disconnected_queue;
|
|
#endif
|
|
|
|
if (!IS_A_TT() && !falcon_got_lock)
|
|
printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
|
|
H_NO(cmd));
|
|
|
|
NCR5380_print_status(cmd->device->host);
|
|
|
|
/* get in phase */
|
|
NCR5380_write(TARGET_COMMAND_REG,
|
|
PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
|
|
/* assert RST */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
|
|
udelay(40);
|
|
/* reset NCR registers */
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
|
|
NCR5380_write(MODE_REG, MR_BASE);
|
|
NCR5380_write(TARGET_COMMAND_REG, 0);
|
|
NCR5380_write(SELECT_ENABLE_REG, 0);
|
|
/* ++roman: reset interrupt condition! otherwise no interrupts don't get
|
|
* through anymore ... */
|
|
(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
|
|
|
|
#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
|
|
/* XXX see below XXX */
|
|
|
|
/* MSch: old-style reset: actually abort all command processing here */
|
|
|
|
/* After the reset, there are no more connected or disconnected commands
|
|
* and no busy units; to avoid problems with re-inserting the commands
|
|
* into the issue_queue (via scsi_done()), the aborted commands are
|
|
* remembered in local variables first.
|
|
*/
|
|
local_irq_save(flags);
|
|
connected = (Scsi_Cmnd *)hostdata->connected;
|
|
hostdata->connected = NULL;
|
|
disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
|
|
hostdata->disconnected_queue = NULL;
|
|
#ifdef SUPPORT_TAGS
|
|
free_all_tags();
|
|
#endif
|
|
for (i = 0; i < 8; ++i)
|
|
hostdata->busy[i] = 0;
|
|
#ifdef REAL_DMA
|
|
hostdata->dma_len = 0;
|
|
#endif
|
|
local_irq_restore(flags);
|
|
|
|
/* In order to tell the mid-level code which commands were aborted,
|
|
* set the command status to DID_RESET and call scsi_done() !!!
|
|
* This ultimately aborts processing of these commands in the mid-level.
|
|
*/
|
|
|
|
if ((cmd = connected)) {
|
|
ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
|
|
cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
|
|
cmd->scsi_done(cmd);
|
|
}
|
|
|
|
for (i = 0; (cmd = disconnected_queue); ++i) {
|
|
disconnected_queue = NEXT(cmd);
|
|
SET_NEXT(cmd, NULL);
|
|
cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
|
|
cmd->scsi_done(cmd);
|
|
}
|
|
if (i > 0)
|
|
ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
|
|
|
|
/* The Falcon lock should be released after a reset...
|
|
*/
|
|
/* ++guenther: moved to atari_scsi_reset(), to prevent a race between
|
|
* unlocking and enabling dma interrupt.
|
|
*/
|
|
/* falcon_release_lock_if_possible( hostdata );*/
|
|
|
|
/* since all commands have been explicitly terminated, we need to tell
|
|
* the midlevel code that the reset was SUCCESSFUL, and there is no
|
|
* need to 'wake up' the commands by a request_sense
|
|
*/
|
|
return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
|
|
#else /* 1 */
|
|
|
|
/* MSch: new-style reset handling: let the mid-level do what it can */
|
|
|
|
/* ++guenther: MID-LEVEL IS STILL BROKEN.
|
|
* Mid-level is supposed to requeue all commands that were active on the
|
|
* various low-level queues. In fact it does this, but that's not enough
|
|
* because all these commands are subject to timeout. And if a timeout
|
|
* happens for any removed command, *_abort() is called but all queues
|
|
* are now empty. Abort then gives up the falcon lock, which is fatal,
|
|
* since the mid-level will queue more commands and must have the lock
|
|
* (it's all happening inside timer interrupt handler!!).
|
|
* Even worse, abort will return NOT_RUNNING for all those commands not
|
|
* on any queue, so they won't be retried ...
|
|
*
|
|
* Conclusion: either scsi.c disables timeout for all resetted commands
|
|
* immediately, or we lose! As of linux-2.0.20 it doesn't.
|
|
*/
|
|
|
|
/* After the reset, there are no more connected or disconnected commands
|
|
* and no busy units; so clear the low-level status here to avoid
|
|
* conflicts when the mid-level code tries to wake up the affected
|
|
* commands!
|
|
*/
|
|
|
|
if (hostdata->issue_queue)
|
|
ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
|
|
if (hostdata->connected)
|
|
ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
|
|
if (hostdata->disconnected_queue)
|
|
ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
|
|
|
|
local_irq_save(flags);
|
|
hostdata->issue_queue = NULL;
|
|
hostdata->connected = NULL;
|
|
hostdata->disconnected_queue = NULL;
|
|
#ifdef SUPPORT_TAGS
|
|
free_all_tags();
|
|
#endif
|
|
for (i = 0; i < 8; ++i)
|
|
hostdata->busy[i] = 0;
|
|
#ifdef REAL_DMA
|
|
hostdata->dma_len = 0;
|
|
#endif
|
|
local_irq_restore(flags);
|
|
|
|
/* we did no complete reset of all commands, so a wakeup is required */
|
|
return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
|
|
#endif /* 1 */
|
|
}
|
|
|