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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>
176 lines
4.6 KiB
C
176 lines
4.6 KiB
C
/*
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* This driver adapted from Drew Eckhardt's Trantor T128 driver
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*
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* Copyright 1993, Drew Eckhardt
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* Visionary Computing
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* (Unix and Linux consulting and custom programming)
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* drew@colorado.edu
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* +1 (303) 666-5836
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*
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* ( Based on T128 - DISTRIBUTION RELEASE 3. )
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*
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* Modified to work with the Pro Audio Spectrum/Studio 16
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* by John Weidman.
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*
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*
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* For more information, please consult
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*
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* Media Vision
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* (510) 770-8600
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* (800) 348-7116
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*
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* and
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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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#ifndef PAS16_H
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#define PAS16_H
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#define PAS16_PUBLIC_RELEASE 3
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#define PDEBUG_INIT 0x1
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#define PDEBUG_TRANSFER 0x2
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#define PAS16_DEFAULT_BASE_1 0x388
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#define PAS16_DEFAULT_BASE_2 0x384
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#define PAS16_DEFAULT_BASE_3 0x38c
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#define PAS16_DEFAULT_BASE_4 0x288
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#define PAS16_DEFAULT_BOARD_1_IRQ 10
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#define PAS16_DEFAULT_BOARD_2_IRQ 12
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#define PAS16_DEFAULT_BOARD_3_IRQ 14
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#define PAS16_DEFAULT_BOARD_4_IRQ 15
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/*
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* The Pro Audio Spectrum boards are I/O mapped. They use a Zilog 5380
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* SCSI controller, which is the equivalent of NCR's 5380. "Pseudo-DMA"
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* architecture is used, where a PAL drives the DMA signals on the 5380
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* allowing fast, blind transfers with proper handshaking.
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*/
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/* The Time-out Counter register is used to safe-guard against a stuck
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* bus (in the case of RDY driven handshake) or a stuck byte (if 16-Bit
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* DMA conversion is used). The counter uses a 28.224MHz clock
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* divided by 14 as its clock source. In the case of a stuck byte in
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* the holding register, an interrupt is generated (and mixed with the
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* one with the drive) using the CD-ROM interrupt pointer.
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*/
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#define P_TIMEOUT_COUNTER_REG 0x4000
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#define P_TC_DISABLE 0x80 /* Set to 0 to enable timeout int. */
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/* Bits D6-D0 contain timeout count */
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#define P_TIMEOUT_STATUS_REG_OFFSET 0x4001
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#define P_TS_TIM 0x80 /* check timeout status */
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/* Bits D6-D4 N/U */
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#define P_TS_ARM_DRQ_INT 0x08 /* Arm DRQ Int. When set high,
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* the next rising edge will
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* cause a CD-ROM interrupt.
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* When set low, the interrupt
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* will be cleared. There is
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* no status available for
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* this interrupt.
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*/
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#define P_TS_ENABLE_TO_ERR_INTERRUPT /* Enable timeout error int. */
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#define P_TS_ENABLE_WAIT /* Enable Wait */
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#define P_TS_CT 0x01 /* clear timeout. Note: writing
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* to this register clears the
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* timeout error int. or status
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*/
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/*
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* The data register reads/writes to/from the 5380 in pseudo-DMA mode
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*/
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#define P_DATA_REG_OFFSET 0x5c00 /* rw */
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#define P_STATUS_REG_OFFSET 0x5c01 /* ro */
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#define P_ST_RDY 0x80 /* 5380 DDRQ Status */
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#define P_IRQ_STATUS 0x5c03
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#define P_IS_IRQ 0x80 /* DIRQ status */
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#define PCB_CONFIG 0x803
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#define MASTER_ADDRESS_PTR 0x9a01 /* Fixed position - no relo */
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#define SYS_CONFIG_4 0x8003
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#define WAIT_STATE 0xbc00
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#define OPERATION_MODE_1 0xec03
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#define IO_CONFIG_3 0xf002
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#ifndef ASM
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static int pas16_abort(Scsi_Cmnd *);
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static int pas16_biosparam(struct scsi_device *, struct block_device *,
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sector_t, int*);
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static int pas16_detect(struct scsi_host_template *);
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static int pas16_queue_command(struct Scsi_Host *, struct scsi_cmnd *);
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static int pas16_bus_reset(Scsi_Cmnd *);
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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 32
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#endif
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#ifndef HOSTS_C
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#define NCR5380_implementation_fields \
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volatile unsigned short io_port
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#define NCR5380_local_declare() \
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volatile unsigned short io_port
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#define NCR5380_setup(instance) \
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io_port = (instance)->io_port
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#define PAS16_io_port(reg) ( io_port + pas16_offset[(reg)] )
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#if !(PDEBUG & PDEBUG_TRANSFER)
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#define NCR5380_read(reg) ( inb(PAS16_io_port(reg)) )
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#define NCR5380_write(reg, value) ( outb((value),PAS16_io_port(reg)) )
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#else
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#define NCR5380_read(reg) \
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(((unsigned char) printk("scsi%d : read register %d at io_port %04x\n"\
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, instance->hostno, (reg), PAS16_io_port(reg))), inb( PAS16_io_port(reg)) )
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#define NCR5380_write(reg, value) \
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(printk("scsi%d : write %02x to register %d at io_port %04x\n", \
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instance->hostno, (value), (reg), PAS16_io_port(reg)), \
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outb( (value),PAS16_io_port(reg) ) )
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#endif
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#define NCR5380_intr pas16_intr
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#define do_NCR5380_intr do_pas16_intr
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#define NCR5380_queue_command pas16_queue_command
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#define NCR5380_abort pas16_abort
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#define NCR5380_bus_reset pas16_bus_reset
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#define NCR5380_proc_info pas16_proc_info
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/* 15 14 12 10 7 5 3
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1101 0100 1010 1000 */
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#define PAS16_IRQS 0xd4a8
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#endif /* else def HOSTS_C */
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#endif /* ndef ASM */
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#endif /* PAS16_H */
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