forked from Minki/linux
ncr5380: Fix trailing whitespace using regexp
This patch is the result of the following substitution. It removes any
tabs and spaces at the end of a line.
perl -i -pe 's,[\t ]+$,,' drivers/scsi/{atari_,}NCR5380.c
This removes some unimportant discrepancies between the two core driver
forks so that the important ones become obvious, to facilitate
reunification.
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain
Martin K. Petersen
parent
c16df32e5f
commit
aff0cf9a7e
@ -1,4 +1,4 @@
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/*
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/*
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* NCR 5380 generic driver routines. These should make it *trivial*
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* to implement 5380 SCSI drivers under Linux with a non-trantor
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* architecture.
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@ -6,12 +6,12 @@
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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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* 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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* For more information, please consult
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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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@ -30,16 +30,16 @@
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*/
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/*
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* Further development / testing that should be done :
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* Further development / testing that should be done :
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* 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
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* code so that everything does the same thing that's done at the
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* code so that everything does the same thing that's done at the
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* end of a pseudo-DMA read operation.
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*
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* 2. Fix REAL_DMA (interrupt driven, polled works fine) -
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* basically, transfer size needs to be reduced by one
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* basically, transfer size needs to be reduced by one
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* and the last byte read as is done with PSEUDO_DMA.
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*
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* 4. Test SCSI-II tagged queueing (I have no devices which support
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*
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* 4. Test SCSI-II tagged queueing (I have no devices which support
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* tagged queueing)
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*/
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@ -56,27 +56,27 @@
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/*
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* Design
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*
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* This is a generic 5380 driver. To use it on a different platform,
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* 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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* 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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* 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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* and commands that are currently executing. This means that an
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* unlimited number of commands may be queued, letting
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* more commands propagate from the higher driver levels giving higher
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* throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
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* allowing multiple commands to propagate all the way to a SCSI-II device
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* while a command is already executing.
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*
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*
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* Issues specific to the NCR5380 :
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* 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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* 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. [...] 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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@ -87,23 +87,23 @@
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* which is started from a workqueue for each NCR5380 host in the
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* system. It attempts to establish I_T_L or I_T_L_Q nexuses by
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* removing the commands from the issue queue and calling
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* NCR5380_select() if a nexus is not established.
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* NCR5380_select() if a nexus is not established.
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*
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* Once a nexus is established, the NCR5380_information_transfer()
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* phase goes through the various phases as instructed by the target.
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* if the target goes into MSG IN and sends a DISCONNECT message,
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* the command structure is placed into the per instance disconnected
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* queue, and NCR5380_main tries to find more work. If the target is
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* queue, and NCR5380_main tries to find more work. If the target is
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* idle for too long, the system will try to sleep.
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*
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* If a command has disconnected, eventually an interrupt will trigger,
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* calling NCR5380_intr() which will in turn call NCR5380_reselect
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* to reestablish a nexus. This will run main if necessary.
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*
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* On command termination, the done function will be called as
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* 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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* 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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@ -113,18 +113,18 @@
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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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* of chips. To use it, you write an architecture specific functions
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* and macros and include this file in your driver.
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*
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* These macros control options :
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* AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
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* These macros control options :
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* AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
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* defined.
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*
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*
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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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* for commands that return with a CHECK CONDITION status.
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*
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* DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
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* transceivers.
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* transceivers.
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*
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* DONT_USE_INTR - if defined, never use interrupts, even if we probe or
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* override-configure an IRQ.
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@ -134,25 +134,25 @@
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* REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
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*
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* REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
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* rely on phase mismatch and EOP interrupts to determine end
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* rely on phase mismatch and EOP interrupts to determine end
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* of phase.
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*
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* These macros MUST be defined :
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*
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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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* NCR5380_write(register, value) - write to the specific register
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*
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* NCR5380_implementation_fields - additional fields needed for this
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* NCR5380_implementation_fields - additional fields needed for this
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* specific implementation of the NCR5380
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*
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* Either real DMA *or* pseudo DMA may be implemented
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* REAL functions :
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* 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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* 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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* 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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@ -165,7 +165,7 @@
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* NCR5380_pread(instance, dst, count);
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*
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* The generic driver is initialized by calling NCR5380_init(instance),
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* after setting the appropriate host specific fields and ID. If the
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* after setting the appropriate host specific fields and ID. If the
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* driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
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* possible) function may be used.
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*/
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@ -182,8 +182,8 @@ static void do_reset(struct Scsi_Host *);
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static inline void initialize_SCp(struct scsi_cmnd *cmd)
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{
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/*
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* Initialize the Scsi Pointer field so that all of the commands in the
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/*
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* Initialize the Scsi Pointer field so that all of the commands in the
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* various queues are valid.
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*/
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@ -268,12 +268,12 @@ static struct {
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unsigned char value;
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const char *name;
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} phases[] __maybe_unused = {
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{PHASE_DATAOUT, "DATAOUT"},
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{PHASE_DATAIN, "DATAIN"},
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{PHASE_CMDOUT, "CMDOUT"},
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{PHASE_STATIN, "STATIN"},
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{PHASE_MSGOUT, "MSGOUT"},
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{PHASE_MSGIN, "MSGIN"},
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{PHASE_DATAOUT, "DATAOUT"},
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{PHASE_DATAIN, "DATAIN"},
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{PHASE_CMDOUT, "CMDOUT"},
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{PHASE_STATIN, "STATIN"},
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{PHASE_MSGOUT, "MSGOUT"},
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{PHASE_MSGIN, "MSGIN"},
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{PHASE_UNKNOWN, "UNKNOWN"}
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};
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@ -281,39 +281,39 @@ static struct {
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static struct {
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unsigned char mask;
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const char *name;
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} signals[] = {
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{SR_DBP, "PARITY"},
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{SR_RST, "RST"},
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{SR_BSY, "BSY"},
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{SR_REQ, "REQ"},
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{SR_MSG, "MSG"},
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{SR_CD, "CD"},
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{SR_IO, "IO"},
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{SR_SEL, "SEL"},
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} signals[] = {
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{SR_DBP, "PARITY"},
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{SR_RST, "RST"},
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{SR_BSY, "BSY"},
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{SR_REQ, "REQ"},
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{SR_MSG, "MSG"},
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{SR_CD, "CD"},
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{SR_IO, "IO"},
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{SR_SEL, "SEL"},
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{0, NULL}
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},
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},
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basrs[] = {
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{BASR_ATN, "ATN"},
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{BASR_ACK, "ACK"},
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{BASR_ATN, "ATN"},
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{BASR_ACK, "ACK"},
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{0, NULL}
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},
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icrs[] = {
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{ICR_ASSERT_RST, "ASSERT RST"},
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{ICR_ASSERT_ACK, "ASSERT ACK"},
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{ICR_ASSERT_BSY, "ASSERT BSY"},
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{ICR_ASSERT_SEL, "ASSERT SEL"},
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{ICR_ASSERT_ATN, "ASSERT ATN"},
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{ICR_ASSERT_DATA, "ASSERT DATA"},
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},
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icrs[] = {
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{ICR_ASSERT_RST, "ASSERT RST"},
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{ICR_ASSERT_ACK, "ASSERT ACK"},
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{ICR_ASSERT_BSY, "ASSERT BSY"},
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{ICR_ASSERT_SEL, "ASSERT SEL"},
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{ICR_ASSERT_ATN, "ASSERT ATN"},
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{ICR_ASSERT_DATA, "ASSERT DATA"},
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{0, NULL}
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},
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mrs[] = {
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{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
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{MR_TARGET, "MODE TARGET"},
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{MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
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{MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
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{MR_MONITOR_BSY, "MODE MONITOR BSY"},
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{MR_DMA_MODE, "MODE DMA"},
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{MR_ARBITRATE, "MODE ARBITRATION"},
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},
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mrs[] = {
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{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
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{MR_TARGET, "MODE TARGET"},
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{MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
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{MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
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{MR_MONITOR_BSY, "MODE MONITOR BSY"},
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{MR_DMA_MODE, "MODE DMA"},
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{MR_ARBITRATE, "MODE ARBITRATION"},
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{0, NULL}
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};
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@ -388,7 +388,7 @@ static int probe_irq __initdata;
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* Set a flag to indicate the IRQ in question was received. This is
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* used by the IRQ probe code.
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*/
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static irqreturn_t __init probe_intr(int irq, void *dev_id)
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{
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probe_irq = irq;
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@ -420,7 +420,7 @@ static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
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/*
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* A interrupt is triggered whenever BSY = false, SEL = true
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* and a bit set in the SELECT_ENABLE_REG is asserted on the
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* and a bit set in the SELECT_ENABLE_REG is asserted on the
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* SCSI bus.
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*
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* Note that the bus is only driven when the phase control signals
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@ -435,7 +435,7 @@ static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
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while (probe_irq == NO_IRQ && time_before(jiffies, timeout))
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schedule_timeout_uninterruptible(1);
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NCR5380_write(SELECT_ENABLE_REG, 0);
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NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
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@ -530,7 +530,7 @@ static int __maybe_unused NCR5380_show_info(struct seq_file *m,
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* with flags OR'd into the initial flags value.
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*
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* Notes : I assume that the host, hostno, and id bits have been
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* set correctly. I don't care about the irq and other fields.
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* set correctly. I don't care about the irq and other fields.
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*
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* Returns 0 for success
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*/
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@ -561,7 +561,7 @@ static int NCR5380_init(struct Scsi_Host *instance, int flags)
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INIT_LIST_HEAD(&hostdata->disconnected);
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hostdata->flags = flags;
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INIT_WORK(&hostdata->main_task, NCR5380_main);
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hostdata->work_q = alloc_workqueue("ncr5380_%d",
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WQ_UNBOUND | WQ_MEM_RECLAIM,
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@ -720,10 +720,10 @@ static int NCR5380_queue_command(struct Scsi_Host *instance,
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spin_lock_irqsave(&hostdata->lock, flags);
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/*
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* Insert the cmd into the issue queue. Note that REQUEST SENSE
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/*
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* Insert the cmd into the issue queue. Note that REQUEST SENSE
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* commands are added to the head of the queue since any command will
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* clear the contingent allegiance condition that exists and the
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* clear the contingent allegiance condition that exists and the
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* sense data is only guaranteed to be valid while the condition exists.
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*/
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@ -803,9 +803,9 @@ static void requeue_cmd(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
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/**
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* NCR5380_main - NCR state machines
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*
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* NCR5380_main is a coroutine that runs as long as more work can
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* be done on the NCR5380 host adapters in a system. Both
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* NCR5380_queue_command() and NCR5380_intr() will try to start it
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* NCR5380_main is a coroutine that runs as long as more work can
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* be done on the NCR5380 host adapters in a system. Both
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* NCR5380_queue_command() and NCR5380_intr() will try to start it
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* in case it is not running.
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*/
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@ -816,7 +816,7 @@ static void NCR5380_main(struct work_struct *work)
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struct Scsi_Host *instance = hostdata->host;
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struct scsi_cmnd *cmd;
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int done;
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do {
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done = 1;
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@ -975,37 +975,37 @@ static irqreturn_t NCR5380_intr(int irq, void *dev_id)
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return IRQ_RETVAL(handled);
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}
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#endif
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#endif
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/*
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/*
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* Function : int NCR5380_select(struct Scsi_Host *instance,
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* struct scsi_cmnd *cmd)
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*
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* Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
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* including ARBITRATION, SELECTION, and initial message out for
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* IDENTIFY and queue messages.
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* including ARBITRATION, SELECTION, and initial message out for
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* IDENTIFY and queue messages.
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*
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* Inputs : instance - instantiation of the 5380 driver on which this
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* Inputs : instance - instantiation of the 5380 driver on which this
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* target lives, cmd - SCSI command to execute.
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*
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*
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* Returns cmd if selection failed but should be retried,
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* NULL if selection failed and should not be retried, or
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* NULL if selection succeeded (hostdata->connected == cmd).
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*
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* Side effects :
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* If bus busy, arbitration failed, etc, NCR5380_select() will exit
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* Side effects :
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* If bus busy, arbitration failed, etc, NCR5380_select() will exit
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* with registers as they should have been on entry - ie
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* SELECT_ENABLE will be set appropriately, the NCR5380
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* will cease to drive any SCSI bus signals.
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*
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* If successful : I_T_L or I_T_L_Q nexus will be established,
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* instance->connected will be set to cmd.
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* If successful : I_T_L or I_T_L_Q nexus will be established,
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* instance->connected will be set to cmd.
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* SELECT interrupt will be disabled.
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*
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* If failed (no target) : cmd->scsi_done() will be called, and the
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* If failed (no target) : cmd->scsi_done() will be called, and the
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* cmd->result host byte set to DID_BAD_TARGET.
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*/
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static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
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struct scsi_cmnd *cmd)
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{
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@ -1028,14 +1028,14 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
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*/
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hostdata->selecting = cmd;
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/*
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* Set the phase bits to 0, otherwise the NCR5380 won't drive the
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/*
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* Set the phase bits to 0, otherwise the NCR5380 won't drive the
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* data bus during SELECTION.
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*/
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|
||||
NCR5380_write(TARGET_COMMAND_REG, 0);
|
||||
|
||||
/*
|
||||
/*
|
||||
* Start arbitration.
|
||||
*/
|
||||
|
||||
@ -1081,8 +1081,8 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
|
||||
NCR5380_write(INITIATOR_COMMAND_REG,
|
||||
ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
|
||||
|
||||
/*
|
||||
* Again, bus clear + bus settle time is 1.2us, however, this is
|
||||
/*
|
||||
* Again, bus clear + bus settle time is 1.2us, however, this is
|
||||
* a minimum so we'll udelay ceil(1.2)
|
||||
*/
|
||||
|
||||
@ -1105,14 +1105,14 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
|
||||
|
||||
dsprintk(NDEBUG_ARBITRATION, instance, "won arbitration\n");
|
||||
|
||||
/*
|
||||
* Now that we have won arbitration, start Selection process, asserting
|
||||
/*
|
||||
* Now that we have won arbitration, start Selection process, asserting
|
||||
* the host and target ID's on the SCSI bus.
|
||||
*/
|
||||
|
||||
NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd))));
|
||||
|
||||
/*
|
||||
/*
|
||||
* Raise ATN while SEL is true before BSY goes false from arbitration,
|
||||
* since this is the only way to guarantee that we'll get a MESSAGE OUT
|
||||
* phase immediately after selection.
|
||||
@ -1121,7 +1121,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
|
||||
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.
|
||||
*/
|
||||
@ -1130,7 +1130,7 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
|
||||
spin_unlock_irq(&hostdata->lock);
|
||||
|
||||
/*
|
||||
* The initiator shall then wait at least two deskew delays and release
|
||||
* 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 */
|
||||
@ -1138,17 +1138,17 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
|
||||
/* 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
|
||||
* 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
|
||||
* 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
|
||||
@ -1159,8 +1159,8 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
|
||||
|
||||
dsprintk(NDEBUG_SELECTION, instance, "selecting target %d\n", scmd_id(cmd));
|
||||
|
||||
/*
|
||||
* The SCSI specification calls for a 250 ms timeout for the actual
|
||||
/*
|
||||
* The SCSI specification calls for a 250 ms timeout for the actual
|
||||
* selection.
|
||||
*/
|
||||
|
||||
@ -1191,9 +1191,9 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
|
||||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* No less than two deskew delays after the initiator detects the
|
||||
* BSY signal is true, it shall release the SEL signal and may
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
|
||||
@ -1202,11 +1202,11 @@ static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
|
||||
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
|
||||
|
||||
/*
|
||||
* Since we followed the SCSI spec, and raised ATN while SEL
|
||||
* 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.
|
||||
@ -1259,16 +1259,16 @@ out:
|
||||
return cmd;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
|
||||
/*
|
||||
* 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
|
||||
* Inputs : instance - instance of driver, *phase - pointer to
|
||||
* what phase is expected, *count - pointer to number of
|
||||
* bytes to transfer, **data - pointer to data pointer.
|
||||
*
|
||||
*
|
||||
* Returns : -1 when different phase is entered without transferring
|
||||
* maximum number of bytes, 0 if all bytes or transferred or exit
|
||||
* is in same phase.
|
||||
@ -1279,7 +1279,7 @@ out:
|
||||
*/
|
||||
|
||||
/*
|
||||
* Note : this code is not as quick as it could be, however it
|
||||
* 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.
|
||||
*/
|
||||
@ -1289,8 +1289,8 @@ static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase
|
||||
int c = *count;
|
||||
unsigned char *d = *data;
|
||||
|
||||
/*
|
||||
* The NCR5380 chip will only drive the SCSI bus when the
|
||||
/*
|
||||
* 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
|
||||
*/
|
||||
@ -1298,9 +1298,9 @@ static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase
|
||||
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
|
||||
|
||||
do {
|
||||
/*
|
||||
* Wait for assertion of REQ, after which the phase bits will be
|
||||
* valid
|
||||
/*
|
||||
* Wait for assertion of REQ, after which the phase bits will be
|
||||
* valid
|
||||
*/
|
||||
|
||||
if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0)
|
||||
@ -1322,7 +1322,7 @@ static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase
|
||||
|
||||
++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
|
||||
@ -1351,11 +1351,11 @@ static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase
|
||||
dsprintk(NDEBUG_HANDSHAKE, instance, "REQ negated, handshake complete\n");
|
||||
|
||||
/*
|
||||
* 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
|
||||
* 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
|
||||
* 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.
|
||||
*
|
||||
@ -1400,7 +1400,7 @@ static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase
|
||||
* it. When the driver is initialized, the NCR5380_intr() handler has not yet
|
||||
* been installed. And when in EH we may have released the ST DMA interrupt.
|
||||
*/
|
||||
|
||||
|
||||
static void do_reset(struct Scsi_Host *instance)
|
||||
{
|
||||
unsigned long flags;
|
||||
@ -1432,12 +1432,12 @@ static int do_abort(struct Scsi_Host *instance)
|
||||
/* 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
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
@ -1447,7 +1447,7 @@ static int do_abort(struct Scsi_Host *instance)
|
||||
goto timeout;
|
||||
|
||||
tmp = NCR5380_read(STATUS_REG) & PHASE_MASK;
|
||||
|
||||
|
||||
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
|
||||
|
||||
if (tmp != PHASE_MSGOUT) {
|
||||
@ -1476,17 +1476,17 @@ timeout:
|
||||
}
|
||||
|
||||
#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
|
||||
/*
|
||||
* Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
|
||||
/*
|
||||
* 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
|
||||
* Inputs : instance - instance of driver, *phase - pointer to
|
||||
* what phase is expected, *count - pointer to number of
|
||||
* bytes to transfer, **data - pointer to data pointer.
|
||||
*
|
||||
*
|
||||
* Returns : -1 when different phase is entered without transferring
|
||||
* maximum number of bytes, 0 if all bytes or transferred or exit
|
||||
* is in same phase.
|
||||
@ -1533,7 +1533,7 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase
|
||||
#else
|
||||
/*
|
||||
* Note : on my sample board, watch-dog timeouts occurred when interrupts
|
||||
* were not disabled for the duration of a single DMA transfer, from
|
||||
* were not disabled for the duration of a single DMA transfer, from
|
||||
* before the setting of DMA mode to after transfer of the last byte.
|
||||
*/
|
||||
|
||||
@ -1546,7 +1546,7 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase
|
||||
|
||||
dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
|
||||
|
||||
/*
|
||||
/*
|
||||
* On the PAS16 at least I/O recovery delays are not needed here.
|
||||
* Everyone else seems to want them.
|
||||
*/
|
||||
@ -1661,24 +1661,24 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase
|
||||
hostdata->flags & FLAG_NO_DMA_FIXUP ? c : c - 1);
|
||||
if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) {
|
||||
/*
|
||||
* We can't disable DMA mode after successfully transferring
|
||||
* We can't disable DMA mode after successfully transferring
|
||||
* what we plan to be the last byte, since that would open up
|
||||
* a race condition where if the target asserted REQ before
|
||||
* a race condition where if the target asserted REQ before
|
||||
* we got the DMA mode reset, the NCR5380 would have latched
|
||||
* an additional byte into the INPUT DATA register and we'd
|
||||
* have dropped it.
|
||||
*
|
||||
* The workaround was to transfer one fewer bytes than we
|
||||
* intended to with the pseudo-DMA read function, wait for
|
||||
*
|
||||
* The workaround was to transfer one fewer bytes than we
|
||||
* intended to with the pseudo-DMA read function, wait for
|
||||
* the chip to latch the last byte, read it, and then disable
|
||||
* pseudo-DMA mode.
|
||||
*
|
||||
*
|
||||
* After REQ is asserted, the NCR5380 asserts DRQ and ACK.
|
||||
* REQ is deasserted when ACK is asserted, and not reasserted
|
||||
* until ACK goes false. Since the NCR5380 won't lower ACK
|
||||
* until DACK is asserted, which won't happen unless we twiddle
|
||||
* the DMA port or we take the NCR5380 out of DMA mode, we
|
||||
* can guarantee that we won't handshake another extra
|
||||
* the DMA port or we take the NCR5380 out of DMA mode, we
|
||||
* can guarantee that we won't handshake another extra
|
||||
* byte.
|
||||
*/
|
||||
|
||||
@ -1698,8 +1698,8 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase
|
||||
foo = NCR5380_pwrite(instance, d, c);
|
||||
if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) {
|
||||
/*
|
||||
* Wait for the last byte to be sent. If REQ is being asserted for
|
||||
* the byte we're interested, we'll ACK it and it will go false.
|
||||
* Wait for the last byte to be sent. If REQ is being asserted for
|
||||
* the byte we're interested, we'll ACK it and it will go false.
|
||||
*/
|
||||
if (NCR5380_poll_politely2(instance,
|
||||
BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ,
|
||||
@ -1723,17 +1723,17 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase
|
||||
/*
|
||||
* 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,
|
||||
* 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
|
||||
* 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
|
||||
* XXX Note : we need to watch for bus free or a reset condition here
|
||||
* to recover from an unexpected bus free condition.
|
||||
*/
|
||||
|
||||
@ -1780,7 +1780,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) {
|
||||
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.
|
||||
*/
|
||||
@ -1795,7 +1795,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) {
|
||||
cmd->SCp.buffers_residual);
|
||||
}
|
||||
/*
|
||||
* The preferred transfer method is going to be
|
||||
* 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.
|
||||
*
|
||||
@ -1871,8 +1871,8 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) {
|
||||
complete_cmd(instance, cmd);
|
||||
}
|
||||
|
||||
/*
|
||||
* Restore phase bits to 0 so an interrupted selection,
|
||||
/*
|
||||
* Restore phase bits to 0 so an interrupted selection,
|
||||
* arbitration can resume.
|
||||
*/
|
||||
NCR5380_write(TARGET_COMMAND_REG, 0);
|
||||
@ -1903,8 +1903,8 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) {
|
||||
instance, "connected command %p for target %d lun %llu moved to disconnected queue\n",
|
||||
cmd, scmd_id(cmd), cmd->device->lun);
|
||||
|
||||
/*
|
||||
* Restore phase bits to 0 so an interrupted selection,
|
||||
/*
|
||||
* Restore phase bits to 0 so an interrupted selection,
|
||||
* arbitration can resume.
|
||||
*/
|
||||
NCR5380_write(TARGET_COMMAND_REG, 0);
|
||||
@ -1913,14 +1913,14 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) {
|
||||
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
|
||||
return;
|
||||
}
|
||||
/*
|
||||
/*
|
||||
* The SCSI data pointer is *IMPLICITLY* saved on a disconnect
|
||||
* operation, in violation of the SCSI spec so we can safely
|
||||
* operation, in violation of the SCSI spec so we can safely
|
||||
* ignore SAVE/RESTORE pointers calls.
|
||||
*
|
||||
* Unfortunately, some disks violate the SCSI spec and
|
||||
* 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
|
||||
* disconnecting, and we have to break spec to remain
|
||||
* compatible.
|
||||
*/
|
||||
case SAVE_POINTERS:
|
||||
@ -1983,8 +1983,8 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) {
|
||||
|
||||
/* Fall through to reject message */
|
||||
|
||||
/*
|
||||
* If we get something weird that we aren't expecting,
|
||||
/*
|
||||
* If we get something weird that we aren't expecting,
|
||||
* reject it.
|
||||
*/
|
||||
default:
|
||||
@ -2021,10 +2021,10 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) {
|
||||
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.
|
||||
/*
|
||||
* 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;
|
||||
@ -2049,10 +2049,10 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance) {
|
||||
/*
|
||||
* Function : void NCR5380_reselect (struct Scsi_Host *instance)
|
||||
*
|
||||
* Purpose : does reselection, initializing the instance->connected
|
||||
* 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.
|
||||
*/
|
||||
|
||||
@ -2077,7 +2077,7 @@ static void NCR5380_reselect(struct Scsi_Host *instance) {
|
||||
|
||||
dsprintk(NDEBUG_RESELECTION, instance, "reselect\n");
|
||||
|
||||
/*
|
||||
/*
|
||||
* 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).
|
||||
@ -2172,7 +2172,7 @@ static void NCR5380_reselect(struct Scsi_Host *instance) {
|
||||
* 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).
|
||||
* mismatch occurs (which would finish the DMA transfer).
|
||||
*
|
||||
* Inputs : instance - this instance of the NCR5380.
|
||||
*
|
||||
@ -2190,7 +2190,7 @@ static void NCR5380_dma_complete(NCR5380_instance * instance) {
|
||||
*
|
||||
* Wait for final byte to transfer, ie wait for ACK to go false.
|
||||
*
|
||||
* We should use the Last Byte Sent bit, unfortunately this is
|
||||
* We should use the Last Byte Sent bit, unfortunately this is
|
||||
* not available on the 5380/5381 (only the various CMOS chips)
|
||||
*
|
||||
* FIXME: timeout, and need to handle long timeout/irq case
|
||||
|
||||
Loading…
Reference in New Issue
Block a user