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linux/drivers/scsi/arm/fas216.h
Jeff Garzik f281233d3e SCSI host lock push-down 
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>
2010-11-16 13:33:23 -08:00

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/*
* linux/drivers/acorn/scsi/fas216.h
*
* Copyright (C) 1997-2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* FAS216 generic driver
*/
#ifndef FAS216_H
#define FAS216_H
#ifndef NO_IRQ
#define NO_IRQ 255
#endif
#include <scsi/scsi_eh.h>
#include "queue.h"
#include "msgqueue.h"
/* FAS register definitions */
/* transfer count low */
#define REG_CTCL (0)
#define REG_STCL (0)
/* transfer count medium */
#define REG_CTCM (1)
#define REG_STCM (1)
/* fifo data */
#define REG_FF (2)
/* command */
#define REG_CMD (3)
#define CMD_NOP 0x00
#define CMD_FLUSHFIFO 0x01
#define CMD_RESETCHIP 0x02
#define CMD_RESETSCSI 0x03
#define CMD_TRANSFERINFO 0x10
#define CMD_INITCMDCOMPLETE 0x11
#define CMD_MSGACCEPTED 0x12
#define CMD_PADBYTES 0x18
#define CMD_SETATN 0x1a
#define CMD_RSETATN 0x1b
#define CMD_SELECTWOATN 0x41
#define CMD_SELECTATN 0x42
#define CMD_SELECTATNSTOP 0x43
#define CMD_ENABLESEL 0x44
#define CMD_DISABLESEL 0x45
#define CMD_SELECTATN3 0x46
#define CMD_RESEL3 0x47
#define CMD_WITHDMA 0x80
/* status register (read) */
#define REG_STAT (4)
#define STAT_IO (1 << 0) /* IO phase */
#define STAT_CD (1 << 1) /* CD phase */
#define STAT_MSG (1 << 2) /* MSG phase */
#define STAT_TRANSFERDONE (1 << 3) /* Transfer completed */
#define STAT_TRANSFERCNTZ (1 << 4) /* Transfer counter is zero */
#define STAT_PARITYERROR (1 << 5) /* Parity error */
#define STAT_REALBAD (1 << 6) /* Something bad */
#define STAT_INT (1 << 7) /* Interrupt */
#define STAT_BUSMASK (STAT_MSG|STAT_CD|STAT_IO)
#define STAT_DATAOUT (0) /* Data out */
#define STAT_DATAIN (STAT_IO) /* Data in */
#define STAT_COMMAND (STAT_CD) /* Command out */
#define STAT_STATUS (STAT_CD|STAT_IO) /* Status In */
#define STAT_MESGOUT (STAT_MSG|STAT_CD) /* Message out */
#define STAT_MESGIN (STAT_MSG|STAT_CD|STAT_IO) /* Message In */
/* bus ID for select / reselect */
#define REG_SDID (4)
#define BUSID(target) ((target) & 7)
/* Interrupt status register (read) */
#define REG_INST (5)
#define INST_SELWOATN (1 << 0) /* Select w/o ATN */
#define INST_SELATN (1 << 1) /* Select w/ATN */
#define INST_RESELECTED (1 << 2) /* Reselected */
#define INST_FUNCDONE (1 << 3) /* Function done */
#define INST_BUSSERVICE (1 << 4) /* Bus service */
#define INST_DISCONNECT (1 << 5) /* Disconnect */
#define INST_ILLEGALCMD (1 << 6) /* Illegal command */
#define INST_BUSRESET (1 << 7) /* SCSI Bus reset */
/* Timeout register (write) */
#define REG_STIM (5)
/* Sequence step register (read) */
#define REG_IS (6)
#define IS_BITS 0x07
#define IS_SELARB 0x00 /* Select & Arb ok */
#define IS_MSGBYTESENT 0x01 /* One byte message sent*/
#define IS_NOTCOMMAND 0x02 /* Not in command state */
#define IS_EARLYPHASE 0x03 /* Early phase change */
#define IS_COMPLETE 0x04 /* Command ok */
#define IS_SOF 0x08 /* Sync off flag */
/* Transfer period step (write) */
#define REG_STP (6)
/* Synchronous Offset (write) */
#define REG_SOF (7)
/* Fifo state register (read) */
#define REG_CFIS (7)
#define CFIS_CF 0x1f /* Num bytes in FIFO */
#define CFIS_IS 0xe0 /* Step */
/* config register 1 */
#define REG_CNTL1 (8)
#define CNTL1_CID (7 << 0) /* Chip ID */
#define CNTL1_STE (1 << 3) /* Self test enable */
#define CNTL1_PERE (1 << 4) /* Parity enable reporting en. */
#define CNTL1_PTE (1 << 5) /* Parity test enable */
#define CNTL1_DISR (1 << 6) /* Disable Irq on SCSI reset */
#define CNTL1_ETM (1 << 7) /* Extended Timing Mode */
/* Clock conversion factor (read) */
#define REG_CLKF (9)
#define CLKF_F37MHZ 0x00 /* 35.01 - 40 MHz */
#define CLKF_F10MHZ 0x02 /* 10 MHz */
#define CLKF_F12MHZ 0x03 /* 10.01 - 15 MHz */
#define CLKF_F17MHZ 0x04 /* 15.01 - 20 MHz */
#define CLKF_F22MHZ 0x05 /* 20.01 - 25 MHz */
#define CLKF_F27MHZ 0x06 /* 25.01 - 30 MHz */
#define CLKF_F32MHZ 0x07 /* 30.01 - 35 MHz */
/* Chip test register (write) */
#define REG_FTM (10)
#define TEST_FTM 0x01 /* Force target mode */
#define TEST_FIM 0x02 /* Force initiator mode */
#define TEST_FHI 0x04 /* Force high impedance mode */
/* Configuration register 2 (read/write) */
#define REG_CNTL2 (11)
#define CNTL2_PGDP (1 << 0) /* Pass Th/Generate Data Parity */
#define CNTL2_PGRP (1 << 1) /* Pass Th/Generate Reg Parity */
#define CNTL2_ACDPE (1 << 2) /* Abort on Cmd/Data Parity Err */
#define CNTL2_S2FE (1 << 3) /* SCSI2 Features Enable */
#define CNTL2_TSDR (1 << 4) /* Tristate DREQ */
#define CNTL2_SBO (1 << 5) /* Select Byte Order */
#define CNTL2_ENF (1 << 6) /* Enable features */
#define CNTL2_DAE (1 << 7) /* Data Alignment Enable */
/* Configuration register 3 (read/write) */
#define REG_CNTL3 (12)
#define CNTL3_BS8 (1 << 0) /* Burst size 8 */
#define CNTL3_MDM (1 << 1) /* Modify DMA mode */
#define CNTL3_LBTM (1 << 2) /* Last Byte Transfer mode */
#define CNTL3_FASTCLK (1 << 3) /* Fast SCSI clocking */
#define CNTL3_FASTSCSI (1 << 4) /* Fast SCSI */
#define CNTL3_G2CB (1 << 5) /* Group2 SCSI support */
#define CNTL3_QTAG (1 << 6) /* Enable 3 byte msgs */
#define CNTL3_ADIDCHK (1 << 7) /* Additional ID check */
/* High transfer count (read/write) */
#define REG_CTCH (14)
#define REG_STCH (14)
/* ID register (read only) */
#define REG_ID (14)
/* Data alignment */
#define REG_DAL (15)
typedef enum {
PHASE_IDLE, /* we're not planning on doing anything */
PHASE_SELECTION, /* selecting a device */
PHASE_SELSTEPS, /* selection with command steps */
PHASE_COMMAND, /* command sent */
PHASE_MESSAGESENT, /* selected, and we're sending cmd */
PHASE_DATAOUT, /* data out to device */
PHASE_DATAIN, /* data in from device */
PHASE_MSGIN, /* message in from device */
PHASE_MSGIN_DISCONNECT, /* disconnecting from bus */
PHASE_MSGOUT, /* after message out phase */
PHASE_MSGOUT_EXPECT, /* expecting message out */
PHASE_STATUS, /* status from device */
PHASE_DONE /* Command complete */
} phase_t;
typedef enum {
DMA_OUT, /* DMA from memory to chip */
DMA_IN /* DMA from chip to memory */
} fasdmadir_t;
typedef enum {
fasdma_none, /* No dma */
fasdma_pio, /* PIO mode */
fasdma_pseudo, /* Pseudo DMA */
fasdma_real_block, /* Real DMA, on block by block basis */
fasdma_real_all /* Real DMA, on request by request */
} fasdmatype_t;
typedef enum {
neg_wait, /* Negociate with device */
neg_inprogress, /* Negociation sent */
neg_complete, /* Negociation complete */
neg_targcomplete, /* Target completed negociation */
neg_invalid /* Negociation not supported */
} neg_t;
#define MAGIC 0x441296bdUL
#define NR_MSGS 8
#define FASCAP_DMA (1 << 0)
#define FASCAP_PSEUDODMA (1 << 1)
typedef struct {
unsigned long magic_start;
spinlock_t host_lock;
struct Scsi_Host *host; /* host */
struct scsi_cmnd *SCpnt; /* currently processing command */
struct scsi_cmnd *origSCpnt; /* original connecting command */
struct scsi_cmnd *reqSCpnt; /* request sense command */
struct scsi_cmnd *rstSCpnt; /* reset command */
struct scsi_cmnd *pending_SCpnt[8]; /* per-device pending commands */
int next_pending; /* next pending device */
/*
* Error recovery
*/
wait_queue_head_t eh_wait;
struct timer_list eh_timer;
unsigned int rst_dev_status;
unsigned int rst_bus_status;
/* driver information */
struct {
phase_t phase; /* current phase */
void __iomem *io_base; /* iomem base of FAS216 */
unsigned int io_shift; /* shift to adjust reg offsets by */
unsigned char cfg[4]; /* configuration registers */
const char *type; /* chip type */
unsigned int irq; /* interrupt */
int dma; /* dma channel */
struct scsi_pointer SCp; /* current commands data pointer */
MsgQueue_t msgs; /* message queue for connected device */
unsigned int async_stp; /* Async transfer STP value */
unsigned char msgin_fifo; /* bytes in fifo at time of message in */
unsigned char message[256]; /* last message received from device */
unsigned char disconnectable:1; /* this command can be disconnected */
unsigned char aborting:1; /* aborting command */
} scsi;
/* statistics information */
struct {
unsigned int queues;
unsigned int removes;
unsigned int fins;
unsigned int reads;
unsigned int writes;
unsigned int miscs;
unsigned int disconnects;
unsigned int aborts;
unsigned int bus_resets;
unsigned int host_resets;
} stats;
/* configuration information */
struct {
unsigned char clockrate; /* clock rate of FAS device (MHz) */
unsigned char select_timeout; /* timeout (R5) */
unsigned char sync_max_depth; /* Synchronous xfer max fifo depth */
unsigned char wide_max_size; /* Maximum wide transfer size */
unsigned char cntl3; /* Control Reg 3 */
unsigned int asyncperiod; /* Async transfer period (ns) */
unsigned int capabilities; /* driver capabilities */
unsigned int disconnect_ok:1; /* Disconnects allowed? */
} ifcfg;
/* queue handling */
struct {
Queue_t issue; /* issue queue */
Queue_t disconnected; /* disconnected command queue */
} queues;
/* per-device info */
struct fas216_device {
unsigned char disconnect_ok:1; /* device can disconnect */
unsigned char parity_enabled:1; /* parity checking enabled */
unsigned char parity_check:1; /* need to check parity checking */
unsigned char period; /* sync xfer period in (*4ns) */
unsigned char stp; /* synchronous transfer period */
unsigned char sof; /* synchronous offset register */
unsigned char wide_xfer; /* currently negociated wide transfer */
neg_t sync_state; /* synchronous transfer mode */
neg_t wide_state; /* wide transfer mode */
} device[8];
unsigned long busyluns[64/sizeof(unsigned long)];/* array of bits indicating LUNs busy */
/* dma */
struct {
fasdmatype_t transfer_type; /* current type of DMA transfer */
fasdmatype_t (*setup) (struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, fasdmatype_t min_dma);
void (*pseudo)(struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, int transfer);
void (*stop) (struct Scsi_Host *host, struct scsi_pointer *SCp);
} dma;
/* miscellaneous */
int internal_done; /* flag to indicate request done */
struct scsi_eh_save ses; /* holds request sense restore info */
unsigned long magic_end;
} FAS216_Info;
/* Function: int fas216_init (struct Scsi_Host *instance)
* Purpose : initialise FAS/NCR/AMD SCSI structures.
* Params : instance - a driver-specific filled-out structure
* Returns : 0 on success
*/
extern int fas216_init (struct Scsi_Host *instance);
/* Function: int fas216_add (struct Scsi_Host *instance, struct device *dev)
* Purpose : initialise FAS/NCR/AMD SCSI ic.
* Params : instance - a driver-specific filled-out structure
* Returns : 0 on success
*/
extern int fas216_add (struct Scsi_Host *instance, struct device *dev);
/* Function: int fas216_queue_command(struct Scsi_Host *h, struct scsi_cmnd *SCpnt)
* Purpose : queue a command for adapter to process.
* Params : h - host adapter
* : SCpnt - Command to queue
* Returns : 0 - success, else error
*/
extern int fas216_queue_command(struct Scsi_Host *h, struct scsi_cmnd *SCpnt);
/* Function: int fas216_noqueue_command(struct Scsi_Host *h, struct scsi_cmnd *SCpnt)
* Purpose : queue a command for adapter to process, and process it to completion.
* Params : h - host adapter
* : SCpnt - Command to queue
* Returns : 0 - success, else error
*/
extern int fas216_noqueue_command(struct Scsi_Host *, struct scsi_cmnd *)
/* Function: irqreturn_t fas216_intr (FAS216_Info *info)
* Purpose : handle interrupts from the interface to progress a command
* Params : info - interface to service
*/
extern irqreturn_t fas216_intr (FAS216_Info *info);
extern void fas216_remove (struct Scsi_Host *instance);
/* Function: void fas216_release (struct Scsi_Host *instance)
* Purpose : release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
* Params : instance - a driver-specific filled-out structure
* Returns : 0 on success
*/
extern void fas216_release (struct Scsi_Host *instance);
extern int fas216_print_host(FAS216_Info *info, char *buffer);
extern int fas216_print_stats(FAS216_Info *info, char *buffer);
extern int fas216_print_devices(FAS216_Info *info, char *buffer);
/* Function: int fas216_eh_abort(struct scsi_cmnd *SCpnt)
* Purpose : abort this command
* Params : SCpnt - command to abort
* Returns : FAILED if unable to abort
*/
extern int fas216_eh_abort(struct scsi_cmnd *SCpnt);
/* Function: int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
* Purpose : Reset the device associated with this command
* Params : SCpnt - command specifing device to reset
* Returns : FAILED if unable to reset
*/
extern int fas216_eh_device_reset(struct scsi_cmnd *SCpnt);
/* Function: int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
* Purpose : Reset the complete bus associated with this command
* Params : SCpnt - command specifing bus to reset
* Returns : FAILED if unable to reset
*/
extern int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt);
/* Function: int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
* Purpose : Reset the host associated with this command
* Params : SCpnt - command specifing host to reset
* Returns : FAILED if unable to reset
*/
extern int fas216_eh_host_reset(struct scsi_cmnd *SCpnt);
#endif /* FAS216_H */
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