f281233d3e
Move the mid-layer's ->queuecommand() invocation from being locked with the host lock to being unlocked to facilitate speeding up the critical path for drivers who don't need this lock taken anyway. The patch below presents a simple SCSI host lock push-down as an equivalent transformation. No locking or other behavior should change with this patch. All existing bugs and locking orders are preserved. Additionally, add one parameter to queuecommand, struct Scsi_Host * and remove one parameter from queuecommand, void (*done)(struct scsi_cmnd *) Scsi_Host* is a convenient pointer that most host drivers need anyway, and 'done' is redundant to struct scsi_cmnd->scsi_done. Minimal code disturbance was attempted with this change. Most drivers needed only two one-line modifications for their host lock push-down. Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Acked-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
380 lines
9.7 KiB
C
380 lines
9.7 KiB
C
/*
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* Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
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*
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* Sun3 DMA additions by Sam Creasey (sammy@sammy.net)
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*
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* Adapted from mac_scsinew.h:
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*/
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/*
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* Cumana Generic NCR5380 driver defines
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*
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* Copyright 1993, Drew Eckhardt
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* Visionary Computing
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* (Unix and Linux consulting and custom programming)
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* drew@colorado.edu
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* +1 (303) 440-4894
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*
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* ALPHA RELEASE 1.
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*
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* For more information, please consult
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*
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* NCR 5380 Family
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* SCSI Protocol Controller
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* Databook
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*
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* NCR Microelectronics
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* 1635 Aeroplaza Drive
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* Colorado Springs, CO 80916
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* 1+ (719) 578-3400
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* 1+ (800) 334-5454
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*/
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/*
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* $Log: cumana_NCR5380.h,v $
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*/
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#ifndef SUN3_NCR5380_H
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#define SUN3_NCR5380_H
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#define SUN3SCSI_PUBLIC_RELEASE 1
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/*
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* Int: level 2 autovector
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* IO: type 1, base 0x00140000, 5 bits phys space: A<4..0>
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*/
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#define IRQ_SUN3_SCSI 2
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#define IOBASE_SUN3_SCSI 0x00140000
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#define IOBASE_SUN3_VMESCSI 0xff200000
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static int sun3scsi_abort(struct scsi_cmnd *);
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static int sun3scsi_detect (struct scsi_host_template *);
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static const char *sun3scsi_info (struct Scsi_Host *);
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static int sun3scsi_bus_reset(struct scsi_cmnd *);
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static int sun3scsi_queue_command(struct Scsi_Host *, struct scsi_cmnd *);
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static int sun3scsi_release (struct Scsi_Host *);
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#ifndef CMD_PER_LUN
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#define CMD_PER_LUN 2
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#endif
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#ifndef CAN_QUEUE
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#define CAN_QUEUE 16
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#endif
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#ifndef SG_TABLESIZE
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#define SG_TABLESIZE SG_NONE
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#endif
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#ifndef MAX_TAGS
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#define MAX_TAGS 32
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#endif
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#ifndef USE_TAGGED_QUEUING
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#define USE_TAGGED_QUEUING 1
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#endif
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#include <scsi/scsicam.h>
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#ifdef SUN3_SCSI_VME
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#define SUN3_SCSI_NAME "Sun3 NCR5380 VME SCSI"
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#else
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#define SUN3_SCSI_NAME "Sun3 NCR5380 SCSI"
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#endif
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#ifndef HOSTS_C
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#define NCR5380_implementation_fields \
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int port, ctrl
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#define NCR5380_local_declare() \
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struct Scsi_Host *_instance
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#define NCR5380_setup(instance) \
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_instance = instance
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#define NCR5380_read(reg) sun3scsi_read(reg)
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#define NCR5380_write(reg, value) sun3scsi_write(reg, value)
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#define NCR5380_intr sun3scsi_intr
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#define NCR5380_queue_command sun3scsi_queue_command
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#define NCR5380_bus_reset sun3scsi_bus_reset
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#define NCR5380_abort sun3scsi_abort
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#define NCR5380_proc_info sun3scsi_proc_info
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#define NCR5380_dma_xfer_len(i, cmd, phase) \
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sun3scsi_dma_xfer_len(cmd->SCp.this_residual,cmd,((phase) & SR_IO) ? 0 : 1)
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#define NCR5380_dma_write_setup(instance, data, count) sun3scsi_dma_setup(data, count, 1)
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#define NCR5380_dma_read_setup(instance, data, count) sun3scsi_dma_setup(data, count, 0)
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#define NCR5380_dma_residual sun3scsi_dma_residual
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#define BOARD_NORMAL 0
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#define BOARD_NCR53C400 1
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/* additional registers - mainly DMA control regs */
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/* these start at regbase + 8 -- directly after the NCR regs */
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struct sun3_dma_regs {
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unsigned short dma_addr_hi; /* vme only */
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unsigned short dma_addr_lo; /* vme only */
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unsigned short dma_count_hi; /* vme only */
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unsigned short dma_count_lo; /* vme only */
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unsigned short udc_data; /* udc dma data reg (obio only) */
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unsigned short udc_addr; /* uda dma addr reg (obio only) */
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unsigned short fifo_data; /* fifo data reg, holds extra byte on
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odd dma reads */
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unsigned short fifo_count;
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unsigned short csr; /* control/status reg */
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unsigned short bpack_hi; /* vme only */
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unsigned short bpack_lo; /* vme only */
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unsigned short ivect; /* vme only */
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unsigned short fifo_count_hi; /* vme only */
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};
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/* ucd chip specific regs - live in dvma space */
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struct sun3_udc_regs {
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unsigned short rsel; /* select regs to load */
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unsigned short addr_hi; /* high word of addr */
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unsigned short addr_lo; /* low word */
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unsigned short count; /* words to be xfer'd */
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unsigned short mode_hi; /* high word of channel mode */
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unsigned short mode_lo; /* low word of channel mode */
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};
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/* addresses of the udc registers */
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#define UDC_MODE 0x38
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#define UDC_CSR 0x2e /* command/status */
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#define UDC_CHN_HI 0x26 /* chain high word */
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#define UDC_CHN_LO 0x22 /* chain lo word */
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#define UDC_CURA_HI 0x1a /* cur reg A high */
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#define UDC_CURA_LO 0x0a /* cur reg A low */
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#define UDC_CURB_HI 0x12 /* cur reg B high */
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#define UDC_CURB_LO 0x02 /* cur reg B low */
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#define UDC_MODE_HI 0x56 /* mode reg high */
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#define UDC_MODE_LO 0x52 /* mode reg low */
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#define UDC_COUNT 0x32 /* words to xfer */
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/* some udc commands */
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#define UDC_RESET 0
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#define UDC_CHN_START 0xa0 /* start chain */
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#define UDC_INT_ENABLE 0x32 /* channel 1 int on */
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/* udc mode words */
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#define UDC_MODE_HIWORD 0x40
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#define UDC_MODE_LSEND 0xc2
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#define UDC_MODE_LRECV 0xd2
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/* udc reg selections */
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#define UDC_RSEL_SEND 0x282
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#define UDC_RSEL_RECV 0x182
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/* bits in csr reg */
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#define CSR_DMA_ACTIVE 0x8000
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#define CSR_DMA_CONFLICT 0x4000
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#define CSR_DMA_BUSERR 0x2000
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#define CSR_FIFO_EMPTY 0x400 /* fifo flushed? */
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#define CSR_SDB_INT 0x200 /* sbc interrupt pending */
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#define CSR_DMA_INT 0x100 /* dma interrupt pending */
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#define CSR_LEFT 0xc0
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#define CSR_LEFT_3 0xc0
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#define CSR_LEFT_2 0x80
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#define CSR_LEFT_1 0x40
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#define CSR_PACK_ENABLE 0x20
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#define CSR_DMA_ENABLE 0x10
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#define CSR_SEND 0x8 /* 1 = send 0 = recv */
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#define CSR_FIFO 0x2 /* reset fifo */
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#define CSR_INTR 0x4 /* interrupt enable */
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#define CSR_SCSI 0x1
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#define VME_DATA24 0x3d00
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// debugging printk's, taken from atari_scsi.h
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/* Debugging printk definitions:
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*
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* ARB -> arbitration
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* ASEN -> auto-sense
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* DMA -> DMA
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* HSH -> PIO handshake
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* INF -> information transfer
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* INI -> initialization
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* INT -> interrupt
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* LNK -> linked commands
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* MAIN -> NCR5380_main() control flow
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* NDAT -> no data-out phase
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* NWR -> no write commands
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* PIO -> PIO transfers
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* PDMA -> pseudo DMA (unused on Atari)
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* QU -> queues
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* RSL -> reselections
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* SEL -> selections
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* USL -> usleep cpde (unused on Atari)
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* LBS -> last byte sent (unused on Atari)
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* RSS -> restarting of selections
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* EXT -> extended messages
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* ABRT -> aborting and resetting
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* TAG -> queue tag handling
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* MER -> merging of consec. buffers
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*
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*/
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#include "NCR5380.h"
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#if NDEBUG & NDEBUG_ARBITRATION
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#define ARB_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define ARB_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_AUTOSENSE
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#define ASEN_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define ASEN_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_DMA
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#define DMA_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define DMA_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_HANDSHAKE
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#define HSH_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define HSH_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_INFORMATION
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#define INF_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define INF_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_INIT
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#define INI_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define INI_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_INTR
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#define INT_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define INT_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_LINKED
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#define LNK_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define LNK_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_MAIN
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#define MAIN_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define MAIN_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_NO_DATAOUT
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#define NDAT_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define NDAT_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_NO_WRITE
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#define NWR_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define NWR_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_PIO
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#define PIO_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define PIO_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_PSEUDO_DMA
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#define PDMA_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define PDMA_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_QUEUES
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#define QU_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define QU_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_RESELECTION
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#define RSL_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define RSL_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_SELECTION
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#define SEL_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define SEL_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_USLEEP
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#define USL_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define USL_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_LAST_BYTE_SENT
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#define LBS_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define LBS_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_RESTART_SELECT
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#define RSS_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define RSS_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_EXTENDED
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#define EXT_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define EXT_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_ABORT
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#define ABRT_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define ABRT_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_TAGS
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#define TAG_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define TAG_PRINTK(format, args...)
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#endif
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#if NDEBUG & NDEBUG_MERGING
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#define MER_PRINTK(format, args...) \
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printk(KERN_DEBUG format , ## args)
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#else
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#define MER_PRINTK(format, args...)
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#endif
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/* conditional macros for NCR5380_print_{,phase,status} */
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#define NCR_PRINT(mask) \
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((NDEBUG & (mask)) ? NCR5380_print(instance) : (void)0)
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#define NCR_PRINT_PHASE(mask) \
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((NDEBUG & (mask)) ? NCR5380_print_phase(instance) : (void)0)
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#define NCR_PRINT_STATUS(mask) \
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((NDEBUG & (mask)) ? NCR5380_print_status(instance) : (void)0)
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#endif /* ndef HOSTS_C */
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#endif /* SUN3_NCR5380_H */
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