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2413 lines
70 KiB
2413 lines
70 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* NCR 5380 generic driver routines. These should make it *trivial* |
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* to implement 5380 SCSI drivers under Linux with a non-trantor |
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* architecture. |
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* |
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* Note that these routines also work with NR53c400 family chips. |
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* |
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* Copyright 1993, Drew Eckhardt |
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* Visionary Computing |
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* (Unix and Linux consulting and custom programming) |
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* [email protected] |
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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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* |
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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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/* |
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* With contributions from Ray Van Tassle, Ingmar Baumgart, |
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* Ronald van Cuijlenborg, Alan Cox and others. |
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*/ |
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|
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/* Ported to Atari by Roman Hodek and others. */ |
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|
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/* Adapted for the Sun 3 by Sam Creasey. */ |
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|
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/* |
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* Design |
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* |
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* This is a generic 5380 driver. To use it on a different platform, |
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* one simply writes appropriate system specific macros (ie, data |
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* transfer - some PC's will use the I/O bus, 68K's must use |
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* memory mapped) and drops this file in their 'C' wrapper. |
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* |
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* As far as command queueing, two queues are maintained for |
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* each 5380 in the system - commands that haven't been issued yet, |
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* and commands that are currently executing. This means that an |
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* unlimited number of commands may be queued, letting |
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* more commands propagate from the higher driver levels giving higher |
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* throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, |
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* allowing multiple commands to propagate all the way to a SCSI-II device |
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* while a command is already executing. |
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* |
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* |
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* Issues specific to the NCR5380 : |
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* |
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* When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
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* piece of hardware that requires you to sit in a loop polling for |
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* the REQ signal as long as you are connected. Some devices are |
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* brain dead (ie, many TEXEL CD ROM drives) and won't disconnect |
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* while doing long seek operations. [...] These |
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* broken devices are the exception rather than the rule and I'd rather |
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* spend my time optimizing for the normal case. |
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* |
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* Architecture : |
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* |
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* At the heart of the design is a coroutine, NCR5380_main, |
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* which is started from a workqueue for each NCR5380 host in the |
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* system. It attempts to establish I_T_L or I_T_L_Q nexuses by |
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* removing the commands from the issue queue and calling |
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* NCR5380_select() if a nexus is not established. |
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* |
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* Once a nexus is established, the NCR5380_information_transfer() |
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* phase goes through the various phases as instructed by the target. |
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* if the target goes into MSG IN and sends a DISCONNECT message, |
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* the command structure is placed into the per instance disconnected |
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* queue, and NCR5380_main tries to find more work. If the target is |
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* idle for too long, the system will try to sleep. |
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* |
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* If a command has disconnected, eventually an interrupt will trigger, |
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* calling NCR5380_intr() which will in turn call NCR5380_reselect |
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* to reestablish a nexus. This will run main if necessary. |
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* |
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* On command termination, the done function will be called as |
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* appropriate. |
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* |
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* SCSI pointers are maintained in the SCp field of SCSI command |
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* structures, being initialized after the command is connected |
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* in NCR5380_select, and set as appropriate in NCR5380_information_transfer. |
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* Note that in violation of the standard, an implicit SAVE POINTERS operation |
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* is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. |
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*/ |
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|
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/* |
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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 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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* 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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* |
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* NCR5380_dma_xfer_len - determine size of DMA/PDMA transfer |
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* NCR5380_dma_send_setup - execute DMA/PDMA from memory to 5380 |
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* NCR5380_dma_recv_setup - execute DMA/PDMA from 5380 to memory |
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* NCR5380_dma_residual - residual byte 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. |
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*/ |
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|
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#ifndef NCR5380_io_delay |
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#define NCR5380_io_delay(x) |
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#endif |
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|
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#ifndef NCR5380_acquire_dma_irq |
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#define NCR5380_acquire_dma_irq(x) (1) |
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#endif |
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|
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#ifndef NCR5380_release_dma_irq |
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#define NCR5380_release_dma_irq(x) |
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#endif |
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|
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static unsigned int disconnect_mask = ~0; |
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module_param(disconnect_mask, int, 0444); |
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|
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static int do_abort(struct Scsi_Host *, unsigned int); |
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static void do_reset(struct Scsi_Host *); |
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static void bus_reset_cleanup(struct Scsi_Host *); |
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|
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/** |
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* initialize_SCp - init the scsi pointer field |
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* @cmd: command block to set up |
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* |
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* Set up the internal fields in the SCSI command. |
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*/ |
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|
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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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* various queues are valid. |
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*/ |
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|
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if (scsi_bufflen(cmd)) { |
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cmd->SCp.buffer = scsi_sglist(cmd); |
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cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
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cmd->SCp.this_residual = cmd->SCp.buffer->length; |
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} else { |
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cmd->SCp.buffer = NULL; |
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cmd->SCp.ptr = NULL; |
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cmd->SCp.this_residual = 0; |
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} |
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|
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cmd->SCp.Status = 0; |
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cmd->SCp.Message = 0; |
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} |
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|
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static inline void advance_sg_buffer(struct scsi_cmnd *cmd) |
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{ |
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struct scatterlist *s = cmd->SCp.buffer; |
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|
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if (!cmd->SCp.this_residual && s && !sg_is_last(s)) { |
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cmd->SCp.buffer = sg_next(s); |
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cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
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cmd->SCp.this_residual = cmd->SCp.buffer->length; |
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} |
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} |
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|
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static inline void set_resid_from_SCp(struct scsi_cmnd *cmd) |
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{ |
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int resid = cmd->SCp.this_residual; |
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struct scatterlist *s = cmd->SCp.buffer; |
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|
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if (s) |
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while (!sg_is_last(s)) { |
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s = sg_next(s); |
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resid += s->length; |
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} |
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scsi_set_resid(cmd, resid); |
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} |
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|
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/** |
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* NCR5380_poll_politely2 - wait for two chip register values |
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* @hostdata: host private data |
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* @reg1: 5380 register to poll |
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* @bit1: Bitmask to check |
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* @val1: Expected value |
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* @reg2: Second 5380 register to poll |
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* @bit2: Second bitmask to check |
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* @val2: Second expected value |
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* @wait: Time-out in jiffies, 0 if sleeping is not allowed |
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* |
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* Polls the chip in a reasonably efficient manner waiting for an |
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* event to occur. After a short quick poll we begin to yield the CPU |
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* (if possible). In irq contexts the time-out is arbitrarily limited. |
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* Callers may hold locks as long as they are held in irq mode. |
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* |
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* Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. |
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*/ |
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|
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static int NCR5380_poll_politely2(struct NCR5380_hostdata *hostdata, |
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unsigned int reg1, u8 bit1, u8 val1, |
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unsigned int reg2, u8 bit2, u8 val2, |
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unsigned long wait) |
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{ |
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unsigned long n = hostdata->poll_loops; |
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unsigned long deadline = jiffies + wait; |
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|
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do { |
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if ((NCR5380_read(reg1) & bit1) == val1) |
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return 0; |
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if ((NCR5380_read(reg2) & bit2) == val2) |
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return 0; |
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cpu_relax(); |
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} while (n--); |
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|
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if (!wait) |
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return -ETIMEDOUT; |
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|
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/* Repeatedly sleep for 1 ms until deadline */ |
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while (time_is_after_jiffies(deadline)) { |
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schedule_timeout_uninterruptible(1); |
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if ((NCR5380_read(reg1) & bit1) == val1) |
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return 0; |
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if ((NCR5380_read(reg2) & bit2) == val2) |
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return 0; |
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} |
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|
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return -ETIMEDOUT; |
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} |
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|
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#if NDEBUG |
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static struct { |
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unsigned char mask; |
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const char *name; |
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} signals[] = { |
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{SR_DBP, "PARITY"}, |
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{SR_RST, "RST"}, |
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{SR_BSY, "BSY"}, |
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{SR_REQ, "REQ"}, |
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{SR_MSG, "MSG"}, |
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{SR_CD, "CD"}, |
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{SR_IO, "IO"}, |
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{SR_SEL, "SEL"}, |
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{0, NULL} |
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}, |
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basrs[] = { |
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{BASR_END_DMA_TRANSFER, "END OF DMA"}, |
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{BASR_DRQ, "DRQ"}, |
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{BASR_PARITY_ERROR, "PARITY ERROR"}, |
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{BASR_IRQ, "IRQ"}, |
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{BASR_PHASE_MATCH, "PHASE MATCH"}, |
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{BASR_BUSY_ERROR, "BUSY ERROR"}, |
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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_ARBITRATION_PROGRESS, "ARB. IN PROGRESS"}, |
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{ICR_ARBITRATION_LOST, "LOST ARB."}, |
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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, "BLOCK DMA MODE"}, |
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{MR_TARGET, "TARGET"}, |
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{MR_ENABLE_PAR_CHECK, "PARITY CHECK"}, |
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{MR_ENABLE_PAR_INTR, "PARITY INTR"}, |
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{MR_ENABLE_EOP_INTR, "EOP INTR"}, |
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{MR_MONITOR_BSY, "MONITOR BSY"}, |
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{MR_DMA_MODE, "DMA MODE"}, |
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{MR_ARBITRATE, "ARBITRATE"}, |
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{0, NULL} |
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}; |
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|
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/** |
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* NCR5380_print - print scsi bus signals |
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* @instance: adapter state to dump |
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* |
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* Print the SCSI bus signals for debugging purposes |
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*/ |
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|
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static void NCR5380_print(struct Scsi_Host *instance) |
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{ |
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struct NCR5380_hostdata *hostdata = shost_priv(instance); |
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unsigned char status, basr, mr, icr, i; |
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|
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status = NCR5380_read(STATUS_REG); |
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mr = NCR5380_read(MODE_REG); |
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icr = NCR5380_read(INITIATOR_COMMAND_REG); |
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basr = NCR5380_read(BUS_AND_STATUS_REG); |
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|
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printk(KERN_DEBUG "SR = 0x%02x : ", status); |
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for (i = 0; signals[i].mask; ++i) |
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if (status & signals[i].mask) |
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printk(KERN_CONT "%s, ", signals[i].name); |
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printk(KERN_CONT "\nBASR = 0x%02x : ", basr); |
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for (i = 0; basrs[i].mask; ++i) |
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if (basr & basrs[i].mask) |
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printk(KERN_CONT "%s, ", basrs[i].name); |
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printk(KERN_CONT "\nICR = 0x%02x : ", icr); |
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for (i = 0; icrs[i].mask; ++i) |
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if (icr & icrs[i].mask) |
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printk(KERN_CONT "%s, ", icrs[i].name); |
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printk(KERN_CONT "\nMR = 0x%02x : ", mr); |
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for (i = 0; mrs[i].mask; ++i) |
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if (mr & mrs[i].mask) |
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printk(KERN_CONT "%s, ", mrs[i].name); |
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printk(KERN_CONT "\n"); |
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} |
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|
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static struct { |
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unsigned char value; |
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const char *name; |
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} phases[] = { |
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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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|
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/** |
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* NCR5380_print_phase - show SCSI phase |
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* @instance: adapter to dump |
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* |
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* Print the current SCSI phase for debugging purposes |
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*/ |
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|
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static void NCR5380_print_phase(struct Scsi_Host *instance) |
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{ |
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struct NCR5380_hostdata *hostdata = shost_priv(instance); |
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unsigned char status; |
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int i; |
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|
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status = NCR5380_read(STATUS_REG); |
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if (!(status & SR_REQ)) |
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shost_printk(KERN_DEBUG, instance, "REQ not asserted, phase unknown.\n"); |
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else { |
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for (i = 0; (phases[i].value != PHASE_UNKNOWN) && |
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(phases[i].value != (status & PHASE_MASK)); ++i) |
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; |
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shost_printk(KERN_DEBUG, instance, "phase %s\n", phases[i].name); |
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} |
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} |
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#endif |
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|
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/** |
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* NCR5380_info - report driver and host information |
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* @instance: relevant scsi host instance |
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* |
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* For use as the host template info() handler. |
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*/ |
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|
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static const char *NCR5380_info(struct Scsi_Host *instance) |
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{ |
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struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
|
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return hostdata->info; |
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} |
|
|
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/** |
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* NCR5380_init - initialise an NCR5380 |
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* @instance: adapter to configure |
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* @flags: control flags |
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* |
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* Initializes *instance and corresponding 5380 chip, |
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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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* |
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* Returns 0 for success |
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*/ |
|
|
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static int NCR5380_init(struct Scsi_Host *instance, int flags) |
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{ |
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struct NCR5380_hostdata *hostdata = shost_priv(instance); |
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int i; |
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unsigned long deadline; |
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unsigned long accesses_per_ms; |
|
|
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instance->max_lun = 7; |
|
|
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hostdata->host = instance; |
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hostdata->id_mask = 1 << instance->this_id; |
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hostdata->id_higher_mask = 0; |
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for (i = hostdata->id_mask; i <= 0x80; i <<= 1) |
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if (i > hostdata->id_mask) |
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hostdata->id_higher_mask |= i; |
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for (i = 0; i < 8; ++i) |
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hostdata->busy[i] = 0; |
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hostdata->dma_len = 0; |
|
|
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spin_lock_init(&hostdata->lock); |
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hostdata->connected = NULL; |
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hostdata->sensing = NULL; |
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INIT_LIST_HEAD(&hostdata->autosense); |
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INIT_LIST_HEAD(&hostdata->unissued); |
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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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1, instance->host_no); |
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if (!hostdata->work_q) |
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return -ENOMEM; |
|
|
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snprintf(hostdata->info, sizeof(hostdata->info), |
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"%s, irq %d, io_port 0x%lx, base 0x%lx, can_queue %d, cmd_per_lun %d, sg_tablesize %d, this_id %d, flags { %s%s%s}", |
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instance->hostt->name, instance->irq, hostdata->io_port, |
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hostdata->base, instance->can_queue, instance->cmd_per_lun, |
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instance->sg_tablesize, instance->this_id, |
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hostdata->flags & FLAG_DMA_FIXUP ? "DMA_FIXUP " : "", |
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hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "", |
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hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : ""); |
|
|
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NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
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NCR5380_write(MODE_REG, MR_BASE); |
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NCR5380_write(TARGET_COMMAND_REG, 0); |
|
NCR5380_write(SELECT_ENABLE_REG, 0); |
|
|
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/* Calibrate register polling loop */ |
|
i = 0; |
|
deadline = jiffies + 1; |
|
do { |
|
cpu_relax(); |
|
} while (time_is_after_jiffies(deadline)); |
|
deadline += msecs_to_jiffies(256); |
|
do { |
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NCR5380_read(STATUS_REG); |
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++i; |
|
cpu_relax(); |
|
} while (time_is_after_jiffies(deadline)); |
|
accesses_per_ms = i / 256; |
|
hostdata->poll_loops = NCR5380_REG_POLL_TIME * accesses_per_ms / 2; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. |
|
* @instance: adapter to check |
|
* |
|
* If the system crashed, it may have crashed with a connected target and |
|
* the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the |
|
* currently established nexus, which we know nothing about. Failing that |
|
* do a bus reset. |
|
* |
|
* Note that a bus reset will cause the chip to assert IRQ. |
|
* |
|
* Returns 0 if successful, otherwise -ENXIO. |
|
*/ |
|
|
|
static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
int pass; |
|
|
|
for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { |
|
switch (pass) { |
|
case 1: |
|
case 3: |
|
case 5: |
|
shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); |
|
NCR5380_poll_politely(hostdata, |
|
STATUS_REG, SR_BSY, 0, 5 * HZ); |
|
break; |
|
case 2: |
|
shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); |
|
do_abort(instance, 1); |
|
break; |
|
case 4: |
|
shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); |
|
do_reset(instance); |
|
/* Wait after a reset; the SCSI standard calls for |
|
* 250ms, we wait 500ms to be on the safe side. |
|
* But some Toshiba CD-ROMs need ten times that. |
|
*/ |
|
if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
|
msleep(2500); |
|
else |
|
msleep(500); |
|
break; |
|
case 6: |
|
shost_printk(KERN_ERR, instance, "bus locked solid\n"); |
|
return -ENXIO; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
/** |
|
* NCR5380_exit - remove an NCR5380 |
|
* @instance: adapter to remove |
|
* |
|
* Assumes that no more work can be queued (e.g. by NCR5380_intr). |
|
*/ |
|
|
|
static void NCR5380_exit(struct Scsi_Host *instance) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
|
|
cancel_work_sync(&hostdata->main_task); |
|
destroy_workqueue(hostdata->work_q); |
|
} |
|
|
|
/** |
|
* complete_cmd - finish processing a command and return it to the SCSI ML |
|
* @instance: the host instance |
|
* @cmd: command to complete |
|
*/ |
|
|
|
static void complete_cmd(struct Scsi_Host *instance, |
|
struct scsi_cmnd *cmd) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
|
|
dsprintk(NDEBUG_QUEUES, instance, "complete_cmd: cmd %p\n", cmd); |
|
|
|
if (hostdata->sensing == cmd) { |
|
/* Autosense processing ends here */ |
|
if (get_status_byte(cmd) != SAM_STAT_GOOD) { |
|
scsi_eh_restore_cmnd(cmd, &hostdata->ses); |
|
} else { |
|
scsi_eh_restore_cmnd(cmd, &hostdata->ses); |
|
set_status_byte(cmd, SAM_STAT_CHECK_CONDITION); |
|
} |
|
hostdata->sensing = NULL; |
|
} |
|
|
|
cmd->scsi_done(cmd); |
|
} |
|
|
|
/** |
|
* NCR5380_queue_command - queue a command |
|
* @instance: the relevant SCSI adapter |
|
* @cmd: SCSI command |
|
* |
|
* 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(struct Scsi_Host *instance, |
|
struct scsi_cmnd *cmd) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
|
unsigned long flags; |
|
|
|
#if (NDEBUG & NDEBUG_NO_WRITE) |
|
switch (cmd->cmnd[0]) { |
|
case WRITE_6: |
|
case WRITE_10: |
|
shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); |
|
cmd->result = (DID_ERROR << 16); |
|
cmd->scsi_done(cmd); |
|
return 0; |
|
} |
|
#endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
|
|
|
cmd->result = 0; |
|
|
|
spin_lock_irqsave(&hostdata->lock, flags); |
|
|
|
if (!NCR5380_acquire_dma_irq(instance)) { |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
|
|
return SCSI_MLQUEUE_HOST_BUSY; |
|
} |
|
|
|
/* |
|
* Insert the cmd into the issue queue. Note that REQUEST SENSE |
|
* commands are added to the head of the queue since any command will |
|
* clear the contingent allegiance condition that exists and the |
|
* sense data is only guaranteed to be valid while the condition exists. |
|
*/ |
|
|
|
if (cmd->cmnd[0] == REQUEST_SENSE) |
|
list_add(&ncmd->list, &hostdata->unissued); |
|
else |
|
list_add_tail(&ncmd->list, &hostdata->unissued); |
|
|
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
|
|
dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", |
|
cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
|
|
|
/* Kick off command processing */ |
|
queue_work(hostdata->work_q, &hostdata->main_task); |
|
return 0; |
|
} |
|
|
|
static inline void maybe_release_dma_irq(struct Scsi_Host *instance) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
|
|
/* Caller does the locking needed to set & test these data atomically */ |
|
if (list_empty(&hostdata->disconnected) && |
|
list_empty(&hostdata->unissued) && |
|
list_empty(&hostdata->autosense) && |
|
!hostdata->connected && |
|
!hostdata->selecting) { |
|
NCR5380_release_dma_irq(instance); |
|
} |
|
} |
|
|
|
/** |
|
* dequeue_next_cmd - dequeue a command for processing |
|
* @instance: the scsi host instance |
|
* |
|
* Priority is given to commands on the autosense queue. These commands |
|
* need autosense because of a CHECK CONDITION result. |
|
* |
|
* Returns a command pointer if a command is found for a target that is |
|
* not already busy. Otherwise returns NULL. |
|
*/ |
|
|
|
static struct scsi_cmnd *dequeue_next_cmd(struct Scsi_Host *instance) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
struct NCR5380_cmd *ncmd; |
|
struct scsi_cmnd *cmd; |
|
|
|
if (hostdata->sensing || list_empty(&hostdata->autosense)) { |
|
list_for_each_entry(ncmd, &hostdata->unissued, list) { |
|
cmd = NCR5380_to_scmd(ncmd); |
|
dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n", |
|
cmd, scmd_id(cmd), hostdata->busy[scmd_id(cmd)], cmd->device->lun); |
|
|
|
if (!(hostdata->busy[scmd_id(cmd)] & (1 << cmd->device->lun))) { |
|
list_del(&ncmd->list); |
|
dsprintk(NDEBUG_QUEUES, instance, |
|
"dequeue: removed %p from issue queue\n", cmd); |
|
return cmd; |
|
} |
|
} |
|
} else { |
|
/* Autosense processing begins here */ |
|
ncmd = list_first_entry(&hostdata->autosense, |
|
struct NCR5380_cmd, list); |
|
list_del(&ncmd->list); |
|
cmd = NCR5380_to_scmd(ncmd); |
|
dsprintk(NDEBUG_QUEUES, instance, |
|
"dequeue: removed %p from autosense queue\n", cmd); |
|
scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); |
|
hostdata->sensing = cmd; |
|
return cmd; |
|
} |
|
return NULL; |
|
} |
|
|
|
static void requeue_cmd(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
|
|
|
if (hostdata->sensing == cmd) { |
|
scsi_eh_restore_cmnd(cmd, &hostdata->ses); |
|
list_add(&ncmd->list, &hostdata->autosense); |
|
hostdata->sensing = NULL; |
|
} else |
|
list_add(&ncmd->list, &hostdata->unissued); |
|
} |
|
|
|
/** |
|
* NCR5380_main - NCR state machines |
|
* |
|
* NCR5380_main is a coroutine that runs as long as more work can |
|
* be done on the NCR5380 host adapters in a system. Both |
|
* NCR5380_queue_command() and NCR5380_intr() will try to start it |
|
* in case it is not running. |
|
*/ |
|
|
|
static void NCR5380_main(struct work_struct *work) |
|
{ |
|
struct NCR5380_hostdata *hostdata = |
|
container_of(work, struct NCR5380_hostdata, main_task); |
|
struct Scsi_Host *instance = hostdata->host; |
|
int done; |
|
|
|
do { |
|
done = 1; |
|
|
|
spin_lock_irq(&hostdata->lock); |
|
while (!hostdata->connected && !hostdata->selecting) { |
|
struct scsi_cmnd *cmd = dequeue_next_cmd(instance); |
|
|
|
if (!cmd) |
|
break; |
|
|
|
dsprintk(NDEBUG_MAIN, instance, "main: dequeued %p\n", cmd); |
|
|
|
/* |
|
* 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. |
|
*/ |
|
/* |
|
* REQUEST SENSE commands are issued without tagged |
|
* queueing, even on SCSI-II devices because the |
|
* contingent allegiance condition exists for the |
|
* entire unit. |
|
*/ |
|
|
|
if (!NCR5380_select(instance, cmd)) { |
|
dsprintk(NDEBUG_MAIN, instance, "main: select complete\n"); |
|
} else { |
|
dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, instance, |
|
"main: select failed, returning %p to queue\n", cmd); |
|
requeue_cmd(instance, cmd); |
|
} |
|
} |
|
if (hostdata->connected && !hostdata->dma_len) { |
|
dsprintk(NDEBUG_MAIN, instance, "main: performing information transfer\n"); |
|
NCR5380_information_transfer(instance); |
|
done = 0; |
|
} |
|
if (!hostdata->connected) { |
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
|
maybe_release_dma_irq(instance); |
|
} |
|
spin_unlock_irq(&hostdata->lock); |
|
if (!done) |
|
cond_resched(); |
|
} while (!done); |
|
} |
|
|
|
/* |
|
* NCR5380_dma_complete - finish DMA transfer |
|
* @instance: the scsi host instance |
|
* |
|
* Called by the interrupt handler when DMA finishes or a phase |
|
* mismatch occurs (which would end the DMA transfer). |
|
*/ |
|
|
|
static void NCR5380_dma_complete(struct Scsi_Host *instance) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
int transferred; |
|
unsigned char **data; |
|
int *count; |
|
int saved_data = 0, overrun = 0; |
|
unsigned char p; |
|
|
|
if (hostdata->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; |
|
dsprintk(NDEBUG_DMA, instance, "read overrun handled\n"); |
|
} |
|
} |
|
} |
|
|
|
#ifdef CONFIG_SUN3 |
|
if (sun3scsi_dma_finish(hostdata->connected->sc_data_direction)) { |
|
pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", |
|
instance->host_no); |
|
BUG(); |
|
} |
|
|
|
if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == |
|
(BASR_PHASE_MATCH | BASR_ACK)) { |
|
pr_err("scsi%d: BASR %02x\n", instance->host_no, |
|
NCR5380_read(BUS_AND_STATUS_REG)); |
|
pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n", |
|
instance->host_no); |
|
BUG(); |
|
} |
|
#endif |
|
|
|
NCR5380_write(MODE_REG, MR_BASE); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
|
|
|
transferred = hostdata->dma_len - NCR5380_dma_residual(hostdata); |
|
hostdata->dma_len = 0; |
|
|
|
data = (unsigned char **)&hostdata->connected->SCp.ptr; |
|
count = &hostdata->connected->SCp.this_residual; |
|
*data += transferred; |
|
*count -= transferred; |
|
|
|
if (hostdata->read_overruns) { |
|
int cnt, toPIO; |
|
|
|
if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { |
|
cnt = toPIO = hostdata->read_overruns; |
|
if (overrun) { |
|
dsprintk(NDEBUG_DMA, instance, |
|
"Got an input overrun, using saved byte\n"); |
|
*(*data)++ = saved_data; |
|
(*count)--; |
|
cnt--; |
|
toPIO--; |
|
} |
|
if (toPIO > 0) { |
|
dsprintk(NDEBUG_DMA, instance, |
|
"Doing %d byte PIO to 0x%p\n", cnt, *data); |
|
NCR5380_transfer_pio(instance, &p, &cnt, data, 0); |
|
*count -= toPIO - cnt; |
|
} |
|
} |
|
} |
|
} |
|
|
|
/** |
|
* NCR5380_intr - generic NCR5380 irq handler |
|
* @irq: interrupt number |
|
* @dev_id: device info |
|
* |
|
* Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
|
* from the disconnected queue, and restarting NCR5380_main() |
|
* as required. |
|
* |
|
* The chip can assert IRQ in any of six different conditions. The IRQ flag |
|
* is then cleared by reading the Reset Parity/Interrupt Register (RPIR). |
|
* Three of these six conditions are latched in the Bus and Status Register: |
|
* - End of DMA (cleared by ending DMA Mode) |
|
* - Parity error (cleared by reading RPIR) |
|
* - Loss of BSY (cleared by reading RPIR) |
|
* Two conditions have flag bits that are not latched: |
|
* - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) |
|
* - Bus reset (non-maskable) |
|
* The remaining condition has no flag bit at all: |
|
* - Selection/reselection |
|
* |
|
* Hence, establishing the cause(s) of any interrupt is partly guesswork. |
|
* In "The DP8490 and DP5380 Comparison Guide", National Semiconductor |
|
* claimed that "the design of the [DP8490] interrupt logic ensures |
|
* interrupts will not be lost (they can be on the DP5380)." |
|
* The L5380/53C80 datasheet from LOGIC Devices has more details. |
|
* |
|
* Checking for bus reset by reading RST is futile because of interrupt |
|
* latency, but a bus reset will reset chip logic. Checking for parity error |
|
* is unnecessary because that interrupt is never enabled. A Loss of BSY |
|
* condition will clear DMA Mode. We can tell when this occurs because the |
|
* the Busy Monitor interrupt is enabled together with DMA Mode. |
|
*/ |
|
|
|
static irqreturn_t __maybe_unused NCR5380_intr(int irq, void *dev_id) |
|
{ |
|
struct Scsi_Host *instance = dev_id; |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
int handled = 0; |
|
unsigned char basr; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&hostdata->lock, flags); |
|
|
|
basr = NCR5380_read(BUS_AND_STATUS_REG); |
|
if (basr & BASR_IRQ) { |
|
unsigned char mr = NCR5380_read(MODE_REG); |
|
unsigned char sr = NCR5380_read(STATUS_REG); |
|
|
|
dsprintk(NDEBUG_INTR, instance, "IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", |
|
irq, basr, sr, mr); |
|
|
|
if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { |
|
/* Probably End of DMA, Phase Mismatch or Loss of BSY. |
|
* We ack IRQ after clearing Mode Register. Workarounds |
|
* for End of DMA errata need to happen in DMA Mode. |
|
*/ |
|
|
|
dsprintk(NDEBUG_INTR, instance, "interrupt in DMA mode\n"); |
|
|
|
if (hostdata->connected) { |
|
NCR5380_dma_complete(instance); |
|
queue_work(hostdata->work_q, &hostdata->main_task); |
|
} else { |
|
NCR5380_write(MODE_REG, MR_BASE); |
|
NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
|
} |
|
} else if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && |
|
(sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { |
|
/* Probably reselected */ |
|
NCR5380_write(SELECT_ENABLE_REG, 0); |
|
NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
|
|
|
dsprintk(NDEBUG_INTR, instance, "interrupt with SEL and IO\n"); |
|
|
|
if (!hostdata->connected) { |
|
NCR5380_reselect(instance); |
|
queue_work(hostdata->work_q, &hostdata->main_task); |
|
} |
|
if (!hostdata->connected) |
|
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
|
} else { |
|
/* Probably Bus Reset */ |
|
NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
|
|
|
if (sr & SR_RST) { |
|
/* Certainly Bus Reset */ |
|
shost_printk(KERN_WARNING, instance, |
|
"bus reset interrupt\n"); |
|
bus_reset_cleanup(instance); |
|
} else { |
|
dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n"); |
|
} |
|
#ifdef SUN3_SCSI_VME |
|
dregs->csr |= CSR_DMA_ENABLE; |
|
#endif |
|
} |
|
handled = 1; |
|
} else { |
|
dsprintk(NDEBUG_INTR, instance, "interrupt without IRQ bit\n"); |
|
#ifdef SUN3_SCSI_VME |
|
dregs->csr |= CSR_DMA_ENABLE; |
|
#endif |
|
} |
|
|
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
|
|
return IRQ_RETVAL(handled); |
|
} |
|
|
|
/** |
|
* NCR5380_select - attempt arbitration and selection for a given command |
|
* @instance: the Scsi_Host instance |
|
* @cmd: the scsi_cmnd to execute |
|
* |
|
* This routine establishes an I_T_L nexus for a SCSI command. This involves |
|
* ARBITRATION, SELECTION and MESSAGE OUT phases and an IDENTIFY message. |
|
* |
|
* Returns true if the operation should be retried. |
|
* Returns false if it should not be retried. |
|
* |
|
* 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 : the I_T_L nexus will be established, and |
|
* hostdata->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 bool NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd) |
|
__releases(&hostdata->lock) __acquires(&hostdata->lock) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
unsigned char tmp[3], phase; |
|
unsigned char *data; |
|
int len; |
|
int err; |
|
bool ret = true; |
|
bool can_disconnect = instance->irq != NO_IRQ && |
|
cmd->cmnd[0] != REQUEST_SENSE && |
|
(disconnect_mask & BIT(scmd_id(cmd))); |
|
|
|
NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
|
dsprintk(NDEBUG_ARBITRATION, instance, "starting arbitration, id = %d\n", |
|
instance->this_id); |
|
|
|
/* |
|
* Arbitration and selection phases are slow and involve dropping the |
|
* lock, so we have to watch out for EH. An exception handler may |
|
* change 'selecting' to NULL. This function will then return false |
|
* so that the caller will forget about 'cmd'. (During information |
|
* transfer phases, EH may change 'connected' to NULL.) |
|
*/ |
|
hostdata->selecting = cmd; |
|
|
|
/* |
|
* Set the phase bits to 0, otherwise the NCR5380 won't drive the |
|
* data bus during SELECTION. |
|
*/ |
|
|
|
NCR5380_write(TARGET_COMMAND_REG, 0); |
|
|
|
/* |
|
* Start arbitration. |
|
*/ |
|
|
|
NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
|
NCR5380_write(MODE_REG, MR_ARBITRATE); |
|
|
|
/* The chip now waits for BUS FREE phase. Then after the 800 ns |
|
* Bus Free Delay, arbitration will begin. |
|
*/ |
|
|
|
spin_unlock_irq(&hostdata->lock); |
|
err = NCR5380_poll_politely2(hostdata, MODE_REG, MR_ARBITRATE, 0, |
|
INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, |
|
ICR_ARBITRATION_PROGRESS, HZ); |
|
spin_lock_irq(&hostdata->lock); |
|
if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { |
|
/* Reselection interrupt */ |
|
goto out; |
|
} |
|
if (!hostdata->selecting) { |
|
/* Command was aborted */ |
|
NCR5380_write(MODE_REG, MR_BASE); |
|
return false; |
|
} |
|
if (err < 0) { |
|
NCR5380_write(MODE_REG, MR_BASE); |
|
shost_printk(KERN_ERR, instance, |
|
"select: arbitration timeout\n"); |
|
goto out; |
|
} |
|
spin_unlock_irq(&hostdata->lock); |
|
|
|
/* The SCSI-2 arbitration delay is 2.4 us */ |
|
udelay(3); |
|
|
|
/* Check for lost arbitration */ |
|
if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || |
|
(NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || |
|
(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
|
NCR5380_write(MODE_REG, MR_BASE); |
|
dsprintk(NDEBUG_ARBITRATION, instance, "lost arbitration, deasserting MR_ARBITRATE\n"); |
|
spin_lock_irq(&hostdata->lock); |
|
goto out; |
|
} |
|
|
|
/* After/during arbitration, BSY should be asserted. |
|
* IBM DPES-31080 Version S31Q works now |
|
* Tnx to [email protected] for finding this! (Roman) |
|
*/ |
|
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 |
|
* a minimum so we'll udelay ceil(1.2) |
|
*/ |
|
|
|
if (hostdata->flags & FLAG_TOSHIBA_DELAY) |
|
udelay(15); |
|
else |
|
udelay(2); |
|
|
|
spin_lock_irq(&hostdata->lock); |
|
|
|
/* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ |
|
if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) |
|
goto out; |
|
|
|
if (!hostdata->selecting) { |
|
NCR5380_write(MODE_REG, MR_BASE); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
return false; |
|
} |
|
|
|
dsprintk(NDEBUG_ARBITRATION, instance, "won arbitration\n"); |
|
|
|
/* |
|
* Now that we have won arbitration, start Selection process, asserting |
|
* the host and target ID's on the SCSI bus. |
|
*/ |
|
|
|
NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask | (1 << scmd_id(cmd))); |
|
|
|
/* |
|
* Raise ATN while SEL is true before BSY goes false from arbitration, |
|
* since this is the only way to guarantee that we'll get a MESSAGE OUT |
|
* phase immediately after selection. |
|
*/ |
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY | |
|
ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL); |
|
NCR5380_write(MODE_REG, MR_BASE); |
|
|
|
/* |
|
* Reselect interrupts must be turned off prior to the dropping of BSY, |
|
* otherwise we will trigger an interrupt. |
|
*/ |
|
NCR5380_write(SELECT_ENABLE_REG, 0); |
|
|
|
spin_unlock_irq(&hostdata->lock); |
|
|
|
/* |
|
* 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); |
|
|
|
dsprintk(NDEBUG_SELECTION, instance, "selecting target %d\n", scmd_id(cmd)); |
|
|
|
/* |
|
* The SCSI specification calls for a 250 ms timeout for the actual |
|
* selection. |
|
*/ |
|
|
|
err = NCR5380_poll_politely(hostdata, STATUS_REG, SR_BSY, SR_BSY, |
|
msecs_to_jiffies(250)); |
|
|
|
if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
|
spin_lock_irq(&hostdata->lock); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
NCR5380_reselect(instance); |
|
shost_printk(KERN_ERR, instance, "reselection after won arbitration?\n"); |
|
goto out; |
|
} |
|
|
|
if (err < 0) { |
|
spin_lock_irq(&hostdata->lock); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
|
|
/* Can't touch cmd if it has been reclaimed by the scsi ML */ |
|
if (!hostdata->selecting) |
|
return false; |
|
|
|
cmd->result = DID_BAD_TARGET << 16; |
|
complete_cmd(instance, cmd); |
|
dsprintk(NDEBUG_SELECTION, instance, |
|
"target did not respond within 250ms\n"); |
|
ret = false; |
|
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 |
|
* change the DATA BUS. -wingel |
|
*/ |
|
|
|
udelay(1); |
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
|
|
|
/* |
|
* 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. |
|
*/ |
|
|
|
/* Wait for start of REQ/ACK handshake */ |
|
|
|
err = NCR5380_poll_politely(hostdata, STATUS_REG, SR_REQ, SR_REQ, HZ); |
|
spin_lock_irq(&hostdata->lock); |
|
if (err < 0) { |
|
shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
goto out; |
|
} |
|
if (!hostdata->selecting) { |
|
do_abort(instance, 0); |
|
return false; |
|
} |
|
|
|
dsprintk(NDEBUG_SELECTION, instance, "target %d selected, going into MESSAGE OUT phase.\n", |
|
scmd_id(cmd)); |
|
tmp[0] = IDENTIFY(can_disconnect, cmd->device->lun); |
|
|
|
len = 1; |
|
data = tmp; |
|
phase = PHASE_MSGOUT; |
|
NCR5380_transfer_pio(instance, &phase, &len, &data, 0); |
|
if (len) { |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
cmd->result = DID_ERROR << 16; |
|
complete_cmd(instance, cmd); |
|
dsprintk(NDEBUG_SELECTION, instance, "IDENTIFY message transfer failed\n"); |
|
ret = false; |
|
goto out; |
|
} |
|
|
|
dsprintk(NDEBUG_SELECTION, instance, "nexus established.\n"); |
|
|
|
hostdata->connected = cmd; |
|
hostdata->busy[cmd->device->id] |= 1 << cmd->device->lun; |
|
|
|
#ifdef SUN3_SCSI_VME |
|
dregs->csr |= CSR_INTR; |
|
#endif |
|
|
|
initialize_SCp(cmd); |
|
|
|
ret = false; |
|
|
|
out: |
|
if (!hostdata->selecting) |
|
return false; |
|
hostdata->selecting = NULL; |
|
return ret; |
|
} |
|
|
|
/* |
|
* 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, |
|
* can_sleep - 1 or 0 when sleeping is permitted or not, respectively. |
|
* |
|
* Returns : -1 when different phase is entered without transferring |
|
* maximum number of bytes, 0 if all bytes are transferred or exit |
|
* is in same phase. |
|
* |
|
* Also, *phase, *count, *data are modified in place. |
|
* |
|
* XXX Note : handling for bus free may be useful. |
|
*/ |
|
|
|
/* |
|
* Note : this code is not as quick as it could be, however it |
|
* IS 100% reliable, and for the actual data transfer where speed |
|
* counts, we will always do a pseudo DMA or DMA transfer. |
|
*/ |
|
|
|
static int NCR5380_transfer_pio(struct Scsi_Host *instance, |
|
unsigned char *phase, int *count, |
|
unsigned char **data, unsigned int can_sleep) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
unsigned char p = *phase, tmp; |
|
int c = *count; |
|
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 |
|
*/ |
|
|
|
if (NCR5380_poll_politely(hostdata, STATUS_REG, SR_REQ, SR_REQ, |
|
HZ * can_sleep) < 0) |
|
break; |
|
|
|
dsprintk(NDEBUG_HANDSHAKE, instance, "REQ asserted\n"); |
|
|
|
/* Check for phase mismatch */ |
|
if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { |
|
dsprintk(NDEBUG_PIO, instance, "phase mismatch\n"); |
|
NCR5380_dprint_phase(NDEBUG_PIO, instance); |
|
break; |
|
} |
|
|
|
/* Do actual transfer from SCSI bus to / from memory */ |
|
if (!(p & SR_IO)) |
|
NCR5380_write(OUTPUT_DATA_REG, *d); |
|
else |
|
*d = NCR5380_read(CURRENT_SCSI_DATA_REG); |
|
|
|
++d; |
|
|
|
/* |
|
* The SCSI standard suggests that in MSGOUT phase, the initiator |
|
* should drop ATN on the last byte of the message phase |
|
* after REQ has been asserted for the handshake but before |
|
* the initiator raises ACK. |
|
*/ |
|
|
|
if (!(p & SR_IO)) { |
|
if (!((p & SR_MSG) && c > 1)) { |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); |
|
NCR5380_dprint(NDEBUG_PIO, instance); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
|
ICR_ASSERT_DATA | ICR_ASSERT_ACK); |
|
} else { |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
|
ICR_ASSERT_DATA | ICR_ASSERT_ATN); |
|
NCR5380_dprint(NDEBUG_PIO, instance); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
|
ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
|
} |
|
} else { |
|
NCR5380_dprint(NDEBUG_PIO, instance); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
|
} |
|
|
|
if (NCR5380_poll_politely(hostdata, |
|
STATUS_REG, SR_REQ, 0, 5 * HZ * can_sleep) < 0) |
|
break; |
|
|
|
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 |
|
* 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); |
|
|
|
dsprintk(NDEBUG_PIO, instance, "residual %d\n", 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 applies if |
|
* we're in MSG IN, DATA IN or STATUS and all bytes have been received. |
|
*/ |
|
if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) |
|
*phase = tmp & PHASE_MASK; |
|
else |
|
*phase = PHASE_UNKNOWN; |
|
|
|
if (!c || (*phase == p)) |
|
return 0; |
|
else |
|
return -1; |
|
} |
|
|
|
/** |
|
* do_reset - issue a reset command |
|
* @instance: adapter to reset |
|
* |
|
* Issue a reset sequence to the NCR5380 and try and get the bus |
|
* back into sane shape. |
|
* |
|
* This clears the reset interrupt flag because there may be no handler for |
|
* 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) |
|
{ |
|
struct NCR5380_hostdata __maybe_unused *hostdata = shost_priv(instance); |
|
unsigned long flags; |
|
|
|
local_irq_save(flags); |
|
NCR5380_write(TARGET_COMMAND_REG, |
|
PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
|
udelay(50); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
(void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
|
local_irq_restore(flags); |
|
} |
|
|
|
/** |
|
* do_abort - abort the currently established nexus by going to |
|
* MESSAGE OUT phase and sending an ABORT message. |
|
* @instance: relevant scsi host instance |
|
* @can_sleep: 1 or 0 when sleeping is permitted or not, respectively |
|
* |
|
* Returns 0 on success, negative error code on failure. |
|
*/ |
|
|
|
static int do_abort(struct Scsi_Host *instance, unsigned int can_sleep) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
unsigned char *msgptr, phase, tmp; |
|
int len; |
|
int rc; |
|
|
|
/* Request message out phase */ |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
|
|
|
/* |
|
* Wait for the target to indicate a valid phase by asserting |
|
* REQ. Once this happens, we'll have either a MSGOUT phase |
|
* and can immediately send the ABORT message, or we'll have some |
|
* other phase and will have to source/sink data. |
|
* |
|
* We really don't care what value was on the bus or what value |
|
* the target sees, so we just handshake. |
|
*/ |
|
|
|
rc = NCR5380_poll_politely(hostdata, STATUS_REG, SR_REQ, SR_REQ, |
|
10 * HZ * can_sleep); |
|
if (rc < 0) |
|
goto out; |
|
|
|
tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; |
|
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
|
|
|
if (tmp != PHASE_MSGOUT) { |
|
NCR5380_write(INITIATOR_COMMAND_REG, |
|
ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
|
rc = NCR5380_poll_politely(hostdata, STATUS_REG, SR_REQ, 0, |
|
3 * HZ * can_sleep); |
|
if (rc < 0) |
|
goto out; |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
|
} |
|
|
|
tmp = ABORT; |
|
msgptr = &tmp; |
|
len = 1; |
|
phase = PHASE_MSGOUT; |
|
NCR5380_transfer_pio(instance, &phase, &len, &msgptr, can_sleep); |
|
if (len) |
|
rc = -ENXIO; |
|
|
|
/* |
|
* If we got here, and the command completed successfully, |
|
* we're about to go into bus free state. |
|
*/ |
|
|
|
out: |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
return rc; |
|
} |
|
|
|
/* |
|
* Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, |
|
* unsigned char *phase, int *count, unsigned char **data) |
|
* |
|
* Purpose : transfers data in given phase using either real |
|
* or pseudo DMA. |
|
* |
|
* Inputs : instance - instance of driver, *phase - pointer to |
|
* what phase is expected, *count - pointer to number of |
|
* bytes to transfer, **data - pointer to data pointer. |
|
* |
|
* Returns : -1 when different phase is entered without transferring |
|
* maximum number of bytes, 0 if all bytes or transferred or exit |
|
* is in same phase. |
|
* |
|
* Also, *phase, *count, *data are modified in place. |
|
*/ |
|
|
|
|
|
static int NCR5380_transfer_dma(struct Scsi_Host *instance, |
|
unsigned char *phase, int *count, |
|
unsigned char **data) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
int c = *count; |
|
unsigned char p = *phase; |
|
unsigned char *d = *data; |
|
unsigned char tmp; |
|
int result = 0; |
|
|
|
if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { |
|
*phase = tmp; |
|
return -1; |
|
} |
|
|
|
hostdata->connected->SCp.phase = p; |
|
|
|
if (p & SR_IO) { |
|
if (hostdata->read_overruns) |
|
c -= hostdata->read_overruns; |
|
else if (hostdata->flags & FLAG_DMA_FIXUP) |
|
--c; |
|
} |
|
|
|
dsprintk(NDEBUG_DMA, instance, "initializing DMA %s: length %d, address %p\n", |
|
(p & SR_IO) ? "receive" : "send", c, d); |
|
|
|
#ifdef CONFIG_SUN3 |
|
/* send start chain */ |
|
sun3scsi_dma_start(c, *data); |
|
#endif |
|
|
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
|
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | |
|
MR_ENABLE_EOP_INTR); |
|
|
|
if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) { |
|
/* On the Medusa, it is a must to initialize the DMA before |
|
* starting the NCR. This is also the cleaner way for the TT. |
|
*/ |
|
if (p & SR_IO) |
|
result = NCR5380_dma_recv_setup(hostdata, d, c); |
|
else |
|
result = NCR5380_dma_send_setup(hostdata, d, c); |
|
} |
|
|
|
/* |
|
* On the PAS16 at least I/O recovery delays are not needed here. |
|
* Everyone else seems to want them. |
|
*/ |
|
|
|
if (p & SR_IO) { |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
NCR5380_io_delay(1); |
|
NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
|
} else { |
|
NCR5380_io_delay(1); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); |
|
NCR5380_io_delay(1); |
|
NCR5380_write(START_DMA_SEND_REG, 0); |
|
NCR5380_io_delay(1); |
|
} |
|
|
|
#ifdef CONFIG_SUN3 |
|
#ifdef SUN3_SCSI_VME |
|
dregs->csr |= CSR_DMA_ENABLE; |
|
#endif |
|
sun3_dma_active = 1; |
|
#endif |
|
|
|
if (hostdata->flags & FLAG_LATE_DMA_SETUP) { |
|
/* On the Falcon, the DMA setup must be done after the last |
|
* NCR access, else the DMA setup gets trashed! |
|
*/ |
|
if (p & SR_IO) |
|
result = NCR5380_dma_recv_setup(hostdata, d, c); |
|
else |
|
result = NCR5380_dma_send_setup(hostdata, d, c); |
|
} |
|
|
|
/* On failure, NCR5380_dma_xxxx_setup() returns a negative int. */ |
|
if (result < 0) |
|
return result; |
|
|
|
/* For real DMA, result is the byte count. DMA interrupt is expected. */ |
|
if (result > 0) { |
|
hostdata->dma_len = result; |
|
return 0; |
|
} |
|
|
|
/* The result is zero iff pseudo DMA send/receive was completed. */ |
|
hostdata->dma_len = c; |
|
|
|
/* |
|
* A note regarding the DMA errata workarounds for early NMOS silicon. |
|
* |
|
* For DMA sends, we want to wait until the last byte has been |
|
* transferred out over the bus before we turn off DMA mode. Alas, there |
|
* seems to be no terribly good way of doing this on a 5380 under all |
|
* conditions. For non-scatter-gather operations, we can wait until REQ |
|
* and ACK both go false, or until a phase mismatch occurs. Gather-sends |
|
* are nastier, since the device will be expecting more data than we |
|
* are prepared to send it, and REQ will remain asserted. On a 53C8[01] we |
|
* could test Last Byte Sent to assure transfer (I imagine this is precisely |
|
* why this signal was added to the newer chips) but on the older 538[01] |
|
* this signal does not exist. The workaround for this lack is a watchdog; |
|
* we bail out of the wait-loop after a modest amount of wait-time if |
|
* the usual exit conditions are not met. Not a terribly clean or |
|
* correct solution :-% |
|
* |
|
* DMA receive is equally tricky due to a nasty characteristic of the NCR5380. |
|
* If the chip is in DMA receive mode, it will respond to a target's |
|
* REQ by latching the SCSI data into the INPUT DATA register and asserting |
|
* ACK, even if it has _already_ been notified by the DMA controller that |
|
* the current DMA transfer has completed! If the NCR5380 is then taken |
|
* out of DMA mode, this already-acknowledged byte is lost. This is |
|
* not a problem for "one DMA transfer per READ command", because |
|
* the situation will never arise... either all of the data is DMA'ed |
|
* properly, or the target switches to MESSAGE IN phase to signal a |
|
* disconnection (either operation bringing the DMA to a clean halt). |
|
* However, in order to handle scatter-receive, we must work around the |
|
* problem. The chosen fix is to DMA fewer bytes, then check for the |
|
* condition before taking the NCR5380 out of DMA mode. One or two extra |
|
* bytes are transferred via PIO as necessary to fill out the original |
|
* request. |
|
*/ |
|
|
|
if (hostdata->flags & FLAG_DMA_FIXUP) { |
|
if (p & SR_IO) { |
|
/* |
|
* The workaround was to transfer fewer bytes than we |
|
* intended to with the pseudo-DMA read function, wait for |
|
* the chip to latch the last byte, read it, and then disable |
|
* pseudo-DMA mode. |
|
* |
|
* After REQ is asserted, the NCR5380 asserts DRQ and ACK. |
|
* REQ is deasserted when ACK is asserted, and not reasserted |
|
* until ACK goes false. Since the NCR5380 won't lower ACK |
|
* until DACK is asserted, which won't happen unless we twiddle |
|
* the DMA port or we take the NCR5380 out of DMA mode, we |
|
* can guarantee that we won't handshake another extra |
|
* byte. |
|
*/ |
|
|
|
if (NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, |
|
BASR_DRQ, BASR_DRQ, 0) < 0) { |
|
result = -1; |
|
shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n"); |
|
} |
|
if (NCR5380_poll_politely(hostdata, STATUS_REG, |
|
SR_REQ, 0, 0) < 0) { |
|
result = -1; |
|
shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n"); |
|
} |
|
d[*count - 1] = NCR5380_read(INPUT_DATA_REG); |
|
} else { |
|
/* |
|
* 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(hostdata, |
|
BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ, |
|
BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, 0) < 0) { |
|
result = -1; |
|
shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n"); |
|
} |
|
} |
|
} |
|
|
|
NCR5380_dma_complete(instance); |
|
return result; |
|
} |
|
|
|
/* |
|
* 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) |
|
__releases(&hostdata->lock) __acquires(&hostdata->lock) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
unsigned char msgout = NOP; |
|
int sink = 0; |
|
int len; |
|
int transfersize; |
|
unsigned char *data; |
|
unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; |
|
struct scsi_cmnd *cmd; |
|
|
|
#ifdef SUN3_SCSI_VME |
|
dregs->csr |= CSR_INTR; |
|
#endif |
|
|
|
while ((cmd = hostdata->connected)) { |
|
struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); |
|
|
|
tmp = NCR5380_read(STATUS_REG); |
|
/* We only have a valid SCSI phase when REQ is asserted */ |
|
if (tmp & SR_REQ) { |
|
phase = (tmp & PHASE_MASK); |
|
if (phase != old_phase) { |
|
old_phase = phase; |
|
NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
|
} |
|
#ifdef CONFIG_SUN3 |
|
if (phase == PHASE_CMDOUT && |
|
sun3_dma_setup_done != cmd) { |
|
int count; |
|
|
|
advance_sg_buffer(cmd); |
|
|
|
count = sun3scsi_dma_xfer_len(hostdata, cmd); |
|
|
|
if (count > 0) { |
|
if (cmd->sc_data_direction == DMA_TO_DEVICE) |
|
sun3scsi_dma_send_setup(hostdata, |
|
cmd->SCp.ptr, count); |
|
else |
|
sun3scsi_dma_recv_setup(hostdata, |
|
cmd->SCp.ptr, count); |
|
sun3_dma_setup_done = cmd; |
|
} |
|
#ifdef SUN3_SCSI_VME |
|
dregs->csr |= CSR_INTR; |
|
#endif |
|
} |
|
#endif /* CONFIG_SUN3 */ |
|
|
|
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) |
|
shost_printk(KERN_DEBUG, instance, "NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n"); |
|
sink = 1; |
|
do_abort(instance, 0); |
|
cmd->result = DID_ERROR << 16; |
|
complete_cmd(instance, cmd); |
|
hostdata->connected = NULL; |
|
hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun); |
|
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. |
|
*/ |
|
|
|
advance_sg_buffer(cmd); |
|
dsprintk(NDEBUG_INFORMATION, instance, |
|
"this residual %d, sg ents %d\n", |
|
cmd->SCp.this_residual, |
|
sg_nents(cmd->SCp.buffer)); |
|
|
|
/* |
|
* 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. |
|
*/ |
|
|
|
transfersize = 0; |
|
if (!cmd->device->borken) |
|
transfersize = NCR5380_dma_xfer_len(hostdata, cmd); |
|
|
|
if (transfersize > 0) { |
|
len = transfersize; |
|
if (NCR5380_transfer_dma(instance, &phase, |
|
&len, (unsigned char **)&cmd->SCp.ptr)) { |
|
/* |
|
* If the watchdog timer fires, all future |
|
* accesses to this device will use the |
|
* polled-IO. |
|
*/ |
|
scmd_printk(KERN_INFO, cmd, |
|
"switching to slow handshake\n"); |
|
cmd->device->borken = 1; |
|
do_reset(instance); |
|
bus_reset_cleanup(instance); |
|
} |
|
} else { |
|
/* Transfer a small chunk so that the |
|
* irq mode lock is not held too long. |
|
*/ |
|
transfersize = min(cmd->SCp.this_residual, |
|
NCR5380_PIO_CHUNK_SIZE); |
|
len = transfersize; |
|
NCR5380_transfer_pio(instance, &phase, &len, |
|
(unsigned char **)&cmd->SCp.ptr, |
|
0); |
|
cmd->SCp.this_residual -= transfersize - len; |
|
} |
|
#ifdef CONFIG_SUN3 |
|
if (sun3_dma_setup_done == cmd) |
|
sun3_dma_setup_done = NULL; |
|
#endif |
|
return; |
|
case PHASE_MSGIN: |
|
len = 1; |
|
data = &tmp; |
|
NCR5380_transfer_pio(instance, &phase, &len, &data, 0); |
|
cmd->SCp.Message = tmp; |
|
|
|
switch (tmp) { |
|
case ABORT: |
|
set_host_byte(cmd, DID_ABORT); |
|
fallthrough; |
|
case COMMAND_COMPLETE: |
|
/* Accept message by clearing ACK */ |
|
sink = 1; |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
dsprintk(NDEBUG_QUEUES, instance, |
|
"COMMAND COMPLETE %p target %d lun %llu\n", |
|
cmd, scmd_id(cmd), cmd->device->lun); |
|
|
|
hostdata->connected = NULL; |
|
hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun); |
|
|
|
set_status_byte(cmd, cmd->SCp.Status); |
|
|
|
set_resid_from_SCp(cmd); |
|
|
|
if (cmd->cmnd[0] == REQUEST_SENSE) |
|
complete_cmd(instance, cmd); |
|
else { |
|
if (cmd->SCp.Status == SAM_STAT_CHECK_CONDITION || |
|
cmd->SCp.Status == SAM_STAT_COMMAND_TERMINATED) { |
|
dsprintk(NDEBUG_QUEUES, instance, "autosense: adding cmd %p to tail of autosense queue\n", |
|
cmd); |
|
list_add_tail(&ncmd->list, |
|
&hostdata->autosense); |
|
} else |
|
complete_cmd(instance, cmd); |
|
} |
|
|
|
/* |
|
* Restore phase bits to 0 so an interrupted selection, |
|
* arbitration can resume. |
|
*/ |
|
NCR5380_write(TARGET_COMMAND_REG, 0); |
|
|
|
return; |
|
case MESSAGE_REJECT: |
|
/* Accept message by clearing ACK */ |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
switch (hostdata->last_message) { |
|
case HEAD_OF_QUEUE_TAG: |
|
case ORDERED_QUEUE_TAG: |
|
case SIMPLE_QUEUE_TAG: |
|
cmd->device->simple_tags = 0; |
|
hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); |
|
break; |
|
default: |
|
break; |
|
} |
|
break; |
|
case DISCONNECT: |
|
/* Accept message by clearing ACK */ |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
hostdata->connected = NULL; |
|
list_add(&ncmd->list, &hostdata->disconnected); |
|
dsprintk(NDEBUG_INFORMATION | NDEBUG_QUEUES, |
|
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, |
|
* arbitration can resume. |
|
*/ |
|
NCR5380_write(TARGET_COMMAND_REG, 0); |
|
|
|
#ifdef SUN3_SCSI_VME |
|
dregs->csr |= CSR_DMA_ENABLE; |
|
#endif |
|
return; |
|
/* |
|
* The SCSI data pointer is *IMPLICITLY* saved on a disconnect |
|
* operation, in violation of the SCSI spec so we can safely |
|
* ignore SAVE/RESTORE pointers calls. |
|
* |
|
* Unfortunately, some disks violate the SCSI spec and |
|
* don't issue the required SAVE_POINTERS message before |
|
* disconnecting, and we have to break spec to remain |
|
* compatible. |
|
*/ |
|
case SAVE_POINTERS: |
|
case RESTORE_POINTERS: |
|
/* Accept message by clearing ACK */ |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
break; |
|
case EXTENDED_MESSAGE: |
|
/* |
|
* Start the 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); |
|
|
|
spin_unlock_irq(&hostdata->lock); |
|
|
|
dsprintk(NDEBUG_EXTENDED, instance, "receiving extended message\n"); |
|
|
|
len = 2; |
|
data = extended_msg + 1; |
|
phase = PHASE_MSGIN; |
|
NCR5380_transfer_pio(instance, &phase, &len, &data, 1); |
|
dsprintk(NDEBUG_EXTENDED, instance, "length %d, code 0x%02x\n", |
|
(int)extended_msg[1], |
|
(int)extended_msg[2]); |
|
|
|
if (!len && extended_msg[1] > 0 && |
|
extended_msg[1] <= sizeof(extended_msg) - 2) { |
|
/* 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, 1); |
|
dsprintk(NDEBUG_EXTENDED, instance, "message received, residual %d\n", |
|
len); |
|
|
|
switch (extended_msg[2]) { |
|
case EXTENDED_SDTR: |
|
case EXTENDED_WDTR: |
|
tmp = 0; |
|
} |
|
} else if (len) { |
|
shost_printk(KERN_ERR, instance, "error receiving extended message\n"); |
|
tmp = 0; |
|
} else { |
|
shost_printk(KERN_NOTICE, instance, "extended message code %02x length %d is too long\n", |
|
extended_msg[2], extended_msg[1]); |
|
tmp = 0; |
|
} |
|
|
|
spin_lock_irq(&hostdata->lock); |
|
if (!hostdata->connected) |
|
return; |
|
|
|
/* Reject message */ |
|
fallthrough; |
|
default: |
|
/* |
|
* If we get something weird that we aren't expecting, |
|
* log it. |
|
*/ |
|
if (tmp == EXTENDED_MESSAGE) |
|
scmd_printk(KERN_INFO, cmd, |
|
"rejecting unknown extended message code %02x, length %d\n", |
|
extended_msg[2], extended_msg[1]); |
|
else if (tmp) |
|
scmd_printk(KERN_INFO, cmd, |
|
"rejecting unknown message code %02x\n", |
|
tmp); |
|
|
|
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, 0); |
|
if (msgout == ABORT) { |
|
hostdata->connected = NULL; |
|
hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun); |
|
cmd->result = DID_ERROR << 16; |
|
complete_cmd(instance, cmd); |
|
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, 0); |
|
break; |
|
case PHASE_STATIN: |
|
len = 1; |
|
data = &tmp; |
|
NCR5380_transfer_pio(instance, &phase, &len, &data, 0); |
|
cmd->SCp.Status = tmp; |
|
break; |
|
default: |
|
shost_printk(KERN_ERR, instance, "unknown phase\n"); |
|
NCR5380_dprint(NDEBUG_ANY, instance); |
|
} /* switch(phase) */ |
|
} else { |
|
spin_unlock_irq(&hostdata->lock); |
|
NCR5380_poll_politely(hostdata, STATUS_REG, SR_REQ, SR_REQ, HZ); |
|
spin_lock_irq(&hostdata->lock); |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* 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) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
unsigned char target_mask; |
|
unsigned char lun; |
|
unsigned char msg[3]; |
|
struct NCR5380_cmd *ncmd; |
|
struct scsi_cmnd *tmp; |
|
|
|
/* |
|
* Disable arbitration, etc. since the host adapter obviously |
|
* lost, and tell an interrupted NCR5380_select() to restart. |
|
*/ |
|
|
|
NCR5380_write(MODE_REG, MR_BASE); |
|
|
|
target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); |
|
if (!target_mask || target_mask & (target_mask - 1)) { |
|
shost_printk(KERN_WARNING, instance, |
|
"reselect: bad target_mask 0x%02x\n", target_mask); |
|
return; |
|
} |
|
|
|
/* |
|
* 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); |
|
if (NCR5380_poll_politely(hostdata, |
|
STATUS_REG, SR_SEL, 0, 0) < 0) { |
|
shost_printk(KERN_ERR, instance, "reselect: !SEL timeout\n"); |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
return; |
|
} |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
|
|
/* |
|
* Wait for target to go into MSGIN. |
|
*/ |
|
|
|
if (NCR5380_poll_politely(hostdata, |
|
STATUS_REG, SR_REQ, SR_REQ, 0) < 0) { |
|
if ((NCR5380_read(STATUS_REG) & (SR_BSY | SR_SEL)) == 0) |
|
/* BUS FREE phase */ |
|
return; |
|
shost_printk(KERN_ERR, instance, "reselect: REQ timeout\n"); |
|
do_abort(instance, 0); |
|
return; |
|
} |
|
|
|
#ifdef CONFIG_SUN3 |
|
/* acknowledge toggle to MSGIN */ |
|
NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); |
|
|
|
/* peek at the byte without really hitting the bus */ |
|
msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); |
|
#else |
|
{ |
|
int len = 1; |
|
unsigned char *data = msg; |
|
unsigned char phase = PHASE_MSGIN; |
|
|
|
NCR5380_transfer_pio(instance, &phase, &len, &data, 0); |
|
|
|
if (len) { |
|
do_abort(instance, 0); |
|
return; |
|
} |
|
} |
|
#endif /* CONFIG_SUN3 */ |
|
|
|
if (!(msg[0] & 0x80)) { |
|
shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); |
|
spi_print_msg(msg); |
|
printk("\n"); |
|
do_abort(instance, 0); |
|
return; |
|
} |
|
lun = msg[0] & 0x07; |
|
|
|
/* |
|
* We need to add code for SCSI-II to track which devices have |
|
* I_T_L_Q nexuses established, and which have simple I_T_L |
|
* nexuses so we can chose to do additional data transfer. |
|
*/ |
|
|
|
/* |
|
* Find the command corresponding to the I_T_L or I_T_L_Q nexus we |
|
* just reestablished, and remove it from the disconnected queue. |
|
*/ |
|
|
|
tmp = NULL; |
|
list_for_each_entry(ncmd, &hostdata->disconnected, list) { |
|
struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); |
|
|
|
if (target_mask == (1 << scmd_id(cmd)) && |
|
lun == (u8)cmd->device->lun) { |
|
list_del(&ncmd->list); |
|
tmp = cmd; |
|
break; |
|
} |
|
} |
|
|
|
if (tmp) { |
|
dsprintk(NDEBUG_RESELECTION | NDEBUG_QUEUES, instance, |
|
"reselect: removed %p from disconnected queue\n", tmp); |
|
} else { |
|
int target = ffs(target_mask) - 1; |
|
|
|
shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", |
|
target_mask, lun); |
|
/* |
|
* Since we have an established nexus that we can't do anything |
|
* with, we must abort it. |
|
*/ |
|
if (do_abort(instance, 0) == 0) |
|
hostdata->busy[target] &= ~(1 << lun); |
|
return; |
|
} |
|
|
|
#ifdef CONFIG_SUN3 |
|
if (sun3_dma_setup_done != tmp) { |
|
int count; |
|
|
|
advance_sg_buffer(tmp); |
|
|
|
count = sun3scsi_dma_xfer_len(hostdata, tmp); |
|
|
|
if (count > 0) { |
|
if (tmp->sc_data_direction == DMA_TO_DEVICE) |
|
sun3scsi_dma_send_setup(hostdata, |
|
tmp->SCp.ptr, count); |
|
else |
|
sun3scsi_dma_recv_setup(hostdata, |
|
tmp->SCp.ptr, count); |
|
sun3_dma_setup_done = tmp; |
|
} |
|
} |
|
|
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
|
#endif /* CONFIG_SUN3 */ |
|
|
|
/* Accept message by clearing ACK */ |
|
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
|
|
|
hostdata->connected = tmp; |
|
dsprintk(NDEBUG_RESELECTION, instance, "nexus established, target %d, lun %llu\n", |
|
scmd_id(tmp), tmp->device->lun); |
|
} |
|
|
|
/** |
|
* list_find_cmd - test for presence of a command in a linked list |
|
* @haystack: list of commands |
|
* @needle: command to search for |
|
*/ |
|
|
|
static bool list_find_cmd(struct list_head *haystack, |
|
struct scsi_cmnd *needle) |
|
{ |
|
struct NCR5380_cmd *ncmd; |
|
|
|
list_for_each_entry(ncmd, haystack, list) |
|
if (NCR5380_to_scmd(ncmd) == needle) |
|
return true; |
|
return false; |
|
} |
|
|
|
/** |
|
* list_remove_cmd - remove a command from linked list |
|
* @haystack: list of commands |
|
* @needle: command to remove |
|
*/ |
|
|
|
static bool list_del_cmd(struct list_head *haystack, |
|
struct scsi_cmnd *needle) |
|
{ |
|
if (list_find_cmd(haystack, needle)) { |
|
struct NCR5380_cmd *ncmd = scsi_cmd_priv(needle); |
|
|
|
list_del(&ncmd->list); |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
/** |
|
* NCR5380_abort - scsi host eh_abort_handler() method |
|
* @cmd: the command to be aborted |
|
* |
|
* Try to abort a given command by removing it from queues and/or sending |
|
* the target an abort message. This may not succeed in causing a target |
|
* to abort the command. Nonetheless, the low-level driver must forget about |
|
* the command because the mid-layer reclaims it and it may be re-issued. |
|
* |
|
* The normal path taken by a command is as follows. For EH we trace this |
|
* same path to locate and abort the command. |
|
* |
|
* unissued -> selecting -> [unissued -> selecting ->]... connected -> |
|
* [disconnected -> connected ->]... |
|
* [autosense -> connected ->] done |
|
* |
|
* If cmd was not found at all then presumably it has already been completed, |
|
* in which case return SUCCESS to try to avoid further EH measures. |
|
* |
|
* If the command has not completed yet, we must not fail to find it. |
|
* We have no option but to forget the aborted command (even if it still |
|
* lacks sense data). The mid-layer may re-issue a command that is in error |
|
* recovery (see scsi_send_eh_cmnd), but the logic and data structures in |
|
* this driver are such that a command can appear on one queue only. |
|
* |
|
* The lock protects driver data structures, but EH handlers also use it |
|
* to serialize their own execution and prevent their own re-entry. |
|
*/ |
|
|
|
static int NCR5380_abort(struct scsi_cmnd *cmd) |
|
{ |
|
struct Scsi_Host *instance = cmd->device->host; |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
unsigned long flags; |
|
int result = SUCCESS; |
|
|
|
spin_lock_irqsave(&hostdata->lock, flags); |
|
|
|
#if (NDEBUG & NDEBUG_ANY) |
|
scmd_printk(KERN_INFO, cmd, __func__); |
|
#endif |
|
NCR5380_dprint(NDEBUG_ANY, instance); |
|
NCR5380_dprint_phase(NDEBUG_ANY, instance); |
|
|
|
if (list_del_cmd(&hostdata->unissued, cmd)) { |
|
dsprintk(NDEBUG_ABORT, instance, |
|
"abort: removed %p from issue queue\n", cmd); |
|
cmd->result = DID_ABORT << 16; |
|
cmd->scsi_done(cmd); /* No tag or busy flag to worry about */ |
|
goto out; |
|
} |
|
|
|
if (hostdata->selecting == cmd) { |
|
dsprintk(NDEBUG_ABORT, instance, |
|
"abort: cmd %p == selecting\n", cmd); |
|
hostdata->selecting = NULL; |
|
cmd->result = DID_ABORT << 16; |
|
complete_cmd(instance, cmd); |
|
goto out; |
|
} |
|
|
|
if (list_del_cmd(&hostdata->disconnected, cmd)) { |
|
dsprintk(NDEBUG_ABORT, instance, |
|
"abort: removed %p from disconnected list\n", cmd); |
|
/* Can't call NCR5380_select() and send ABORT because that |
|
* means releasing the lock. Need a bus reset. |
|
*/ |
|
set_host_byte(cmd, DID_ERROR); |
|
complete_cmd(instance, cmd); |
|
result = FAILED; |
|
goto out; |
|
} |
|
|
|
if (hostdata->connected == cmd) { |
|
dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd); |
|
hostdata->connected = NULL; |
|
hostdata->dma_len = 0; |
|
if (do_abort(instance, 0) < 0) { |
|
set_host_byte(cmd, DID_ERROR); |
|
complete_cmd(instance, cmd); |
|
result = FAILED; |
|
goto out; |
|
} |
|
set_host_byte(cmd, DID_ABORT); |
|
complete_cmd(instance, cmd); |
|
goto out; |
|
} |
|
|
|
if (list_del_cmd(&hostdata->autosense, cmd)) { |
|
dsprintk(NDEBUG_ABORT, instance, |
|
"abort: removed %p from sense queue\n", cmd); |
|
complete_cmd(instance, cmd); |
|
} |
|
|
|
out: |
|
if (result == FAILED) |
|
dsprintk(NDEBUG_ABORT, instance, "abort: failed to abort %p\n", cmd); |
|
else { |
|
hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun); |
|
dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd); |
|
} |
|
|
|
queue_work(hostdata->work_q, &hostdata->main_task); |
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
|
|
return result; |
|
} |
|
|
|
|
|
static void bus_reset_cleanup(struct Scsi_Host *instance) |
|
{ |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
int i; |
|
struct NCR5380_cmd *ncmd; |
|
|
|
/* reset NCR registers */ |
|
NCR5380_write(MODE_REG, MR_BASE); |
|
NCR5380_write(TARGET_COMMAND_REG, 0); |
|
NCR5380_write(SELECT_ENABLE_REG, 0); |
|
|
|
/* 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->selecting) { |
|
hostdata->selecting->result = DID_RESET << 16; |
|
complete_cmd(instance, hostdata->selecting); |
|
hostdata->selecting = NULL; |
|
} |
|
|
|
list_for_each_entry(ncmd, &hostdata->disconnected, list) { |
|
struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); |
|
|
|
set_host_byte(cmd, DID_RESET); |
|
complete_cmd(instance, cmd); |
|
} |
|
INIT_LIST_HEAD(&hostdata->disconnected); |
|
|
|
list_for_each_entry(ncmd, &hostdata->autosense, list) { |
|
struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); |
|
|
|
cmd->scsi_done(cmd); |
|
} |
|
INIT_LIST_HEAD(&hostdata->autosense); |
|
|
|
if (hostdata->connected) { |
|
set_host_byte(hostdata->connected, DID_RESET); |
|
complete_cmd(instance, hostdata->connected); |
|
hostdata->connected = NULL; |
|
} |
|
|
|
for (i = 0; i < 8; ++i) |
|
hostdata->busy[i] = 0; |
|
hostdata->dma_len = 0; |
|
|
|
queue_work(hostdata->work_q, &hostdata->main_task); |
|
} |
|
|
|
/** |
|
* NCR5380_host_reset - reset the SCSI host |
|
* @cmd: SCSI command undergoing EH |
|
* |
|
* Returns SUCCESS |
|
*/ |
|
|
|
static int NCR5380_host_reset(struct scsi_cmnd *cmd) |
|
{ |
|
struct Scsi_Host *instance = cmd->device->host; |
|
struct NCR5380_hostdata *hostdata = shost_priv(instance); |
|
unsigned long flags; |
|
struct NCR5380_cmd *ncmd; |
|
|
|
spin_lock_irqsave(&hostdata->lock, flags); |
|
|
|
#if (NDEBUG & NDEBUG_ANY) |
|
shost_printk(KERN_INFO, instance, __func__); |
|
#endif |
|
NCR5380_dprint(NDEBUG_ANY, instance); |
|
NCR5380_dprint_phase(NDEBUG_ANY, instance); |
|
|
|
list_for_each_entry(ncmd, &hostdata->unissued, list) { |
|
struct scsi_cmnd *scmd = NCR5380_to_scmd(ncmd); |
|
|
|
scmd->result = DID_RESET << 16; |
|
scmd->scsi_done(scmd); |
|
} |
|
INIT_LIST_HEAD(&hostdata->unissued); |
|
|
|
do_reset(instance); |
|
bus_reset_cleanup(instance); |
|
|
|
spin_unlock_irqrestore(&hostdata->lock, flags); |
|
|
|
return SUCCESS; |
|
}
|
|
|