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linux/drivers/scsi/wd33c93.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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/*
* wd33c93.h - Linux device driver definitions for the
* Commodore Amiga A2091/590 SCSI controller card
*
* IMPORTANT: This file is for version 1.25 - 09/Jul/1997
*
* Copyright (c) 1996 John Shifflett, GeoLog Consulting
* john@geolog.com
* jshiffle@netcom.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef WD33C93_H
#define WD33C93_H
#define PROC_INTERFACE /* add code for /proc/scsi/wd33c93/xxx interface */
#ifdef PROC_INTERFACE
#define PROC_STATISTICS /* add code for keeping various real time stats */
#endif
#define SYNC_DEBUG /* extra info on sync negotiation printed */
#define DEBUGGING_ON /* enable command-line debugging bitmask */
#define DEBUG_DEFAULTS 0 /* default debugging bitmask */
#ifdef DEBUGGING_ON
#define DB(f,a) if (hostdata->args & (f)) a;
#else
#define DB(f,a)
#endif
#define uchar unsigned char
/* wd register names */
#define WD_OWN_ID 0x00
#define WD_CONTROL 0x01
#define WD_TIMEOUT_PERIOD 0x02
#define WD_CDB_1 0x03
#define WD_CDB_2 0x04
#define WD_CDB_3 0x05
#define WD_CDB_4 0x06
#define WD_CDB_5 0x07
#define WD_CDB_6 0x08
#define WD_CDB_7 0x09
#define WD_CDB_8 0x0a
#define WD_CDB_9 0x0b
#define WD_CDB_10 0x0c
#define WD_CDB_11 0x0d
#define WD_CDB_12 0x0e
#define WD_TARGET_LUN 0x0f
#define WD_COMMAND_PHASE 0x10
#define WD_SYNCHRONOUS_TRANSFER 0x11
#define WD_TRANSFER_COUNT_MSB 0x12
#define WD_TRANSFER_COUNT 0x13
#define WD_TRANSFER_COUNT_LSB 0x14
#define WD_DESTINATION_ID 0x15
#define WD_SOURCE_ID 0x16
#define WD_SCSI_STATUS 0x17
#define WD_COMMAND 0x18
#define WD_DATA 0x19
#define WD_QUEUE_TAG 0x1a
#define WD_AUXILIARY_STATUS 0x1f
/* WD commands */
#define WD_CMD_RESET 0x00
#define WD_CMD_ABORT 0x01
#define WD_CMD_ASSERT_ATN 0x02
#define WD_CMD_NEGATE_ACK 0x03
#define WD_CMD_DISCONNECT 0x04
#define WD_CMD_RESELECT 0x05
#define WD_CMD_SEL_ATN 0x06
#define WD_CMD_SEL 0x07
#define WD_CMD_SEL_ATN_XFER 0x08
#define WD_CMD_SEL_XFER 0x09
#define WD_CMD_RESEL_RECEIVE 0x0a
#define WD_CMD_RESEL_SEND 0x0b
#define WD_CMD_WAIT_SEL_RECEIVE 0x0c
#define WD_CMD_TRANS_ADDR 0x18
#define WD_CMD_TRANS_INFO 0x20
#define WD_CMD_TRANSFER_PAD 0x21
#define WD_CMD_SBT_MODE 0x80
/* ASR register */
#define ASR_INT (0x80)
#define ASR_LCI (0x40)
#define ASR_BSY (0x20)
#define ASR_CIP (0x10)
#define ASR_PE (0x02)
#define ASR_DBR (0x01)
/* SCSI Bus Phases */
#define PHS_DATA_OUT 0x00
#define PHS_DATA_IN 0x01
#define PHS_COMMAND 0x02
#define PHS_STATUS 0x03
#define PHS_MESS_OUT 0x06
#define PHS_MESS_IN 0x07
/* Command Status Register definitions */
/* reset state interrupts */
#define CSR_RESET 0x00
#define CSR_RESET_AF 0x01
/* successful completion interrupts */
#define CSR_RESELECT 0x10
#define CSR_SELECT 0x11
#define CSR_SEL_XFER_DONE 0x16
#define CSR_XFER_DONE 0x18
/* paused or aborted interrupts */
#define CSR_MSGIN 0x20
#define CSR_SDP 0x21
#define CSR_SEL_ABORT 0x22
#define CSR_RESEL_ABORT 0x25
#define CSR_RESEL_ABORT_AM 0x27
#define CSR_ABORT 0x28
/* terminated interrupts */
#define CSR_INVALID 0x40
#define CSR_UNEXP_DISC 0x41
#define CSR_TIMEOUT 0x42
#define CSR_PARITY 0x43
#define CSR_PARITY_ATN 0x44
#define CSR_BAD_STATUS 0x45
#define CSR_UNEXP 0x48
/* service required interrupts */
#define CSR_RESEL 0x80
#define CSR_RESEL_AM 0x81
#define CSR_DISC 0x85
#define CSR_SRV_REQ 0x88
/* Own ID/CDB Size register */
#define OWNID_EAF 0x08
#define OWNID_EHP 0x10
#define OWNID_RAF 0x20
#define OWNID_FS_8 0x00
#define OWNID_FS_12 0x40
#define OWNID_FS_16 0x80
/* define these so we don't have to change a2091.c, etc. */
#define WD33C93_FS_8_10 OWNID_FS_8
#define WD33C93_FS_12_15 OWNID_FS_12
#define WD33C93_FS_16_20 OWNID_FS_16
/* pass input-clock explicitly. accepted mhz values are 8-10,12-20 */
#define WD33C93_FS_MHZ(mhz) (mhz)
/* Control register */
#define CTRL_HSP 0x01
#define CTRL_HA 0x02
#define CTRL_IDI 0x04
#define CTRL_EDI 0x08
#define CTRL_HHP 0x10
#define CTRL_POLLED 0x00
#define CTRL_BURST 0x20
#define CTRL_BUS 0x40
#define CTRL_DMA 0x80
/* Timeout Period register */
#define TIMEOUT_PERIOD_VALUE 20 /* 20 = 200 ms */
/* Synchronous Transfer Register */
#define STR_FSS 0x80
/* Destination ID register */
#define DSTID_DPD 0x40
#define DATA_OUT_DIR 0
#define DATA_IN_DIR 1
#define DSTID_SCC 0x80
/* Source ID register */
#define SRCID_MASK 0x07
#define SRCID_SIV 0x08
#define SRCID_DSP 0x20
#define SRCID_ES 0x40
#define SRCID_ER 0x80
/* This is what the 3393 chip looks like to us */
typedef struct {
#ifdef CONFIG_WD33C93_PIO
unsigned int SASR;
unsigned int SCMD;
#else
volatile unsigned char *SASR;
volatile unsigned char *SCMD;
#endif
} wd33c93_regs;
typedef int (*dma_setup_t) (struct scsi_cmnd *SCpnt, int dir_in);
typedef void (*dma_stop_t) (struct Scsi_Host *instance,
struct scsi_cmnd *SCpnt, int status);
#define ILLEGAL_STATUS_BYTE 0xff
#define DEFAULT_SX_PER 376 /* (ns) fairly safe */
#define DEFAULT_SX_OFF 0 /* aka async */
#define OPTIMUM_SX_PER 252 /* (ns) best we can do (mult-of-4) */
#define OPTIMUM_SX_OFF 12 /* size of wd3393 fifo */
struct sx_period {
unsigned int period_ns;
uchar reg_value;
};
/* FEF: defines for hostdata->dma_buffer_pool */
#define BUF_CHIP_ALLOCED 0
#define BUF_SCSI_ALLOCED 1
struct WD33C93_hostdata {
struct Scsi_Host *next;
wd33c93_regs regs;
spinlock_t lock;
uchar clock_freq;
uchar chip; /* what kind of wd33c93? */
uchar microcode; /* microcode rev */
uchar dma_buffer_pool; /* FEF: buffer from chip_ram? */
int dma_dir; /* data transfer dir. */
dma_setup_t dma_setup;
dma_stop_t dma_stop;
unsigned int dma_xfer_mask;
uchar *dma_bounce_buffer;
unsigned int dma_bounce_len;
volatile uchar busy[8]; /* index = target, bit = lun */
volatile struct scsi_cmnd *input_Q; /* commands waiting to be started */
volatile struct scsi_cmnd *selecting; /* trying to select this command */
volatile struct scsi_cmnd *connected; /* currently connected command */
volatile struct scsi_cmnd *disconnected_Q;/* commands waiting for reconnect */
uchar state; /* what we are currently doing */
uchar dma; /* current state of DMA (on/off) */
uchar level2; /* extent to which Level-2 commands are used */
uchar disconnect; /* disconnect/reselect policy */
unsigned int args; /* set from command-line argument */
uchar incoming_msg[8]; /* filled during message_in phase */
int incoming_ptr; /* mainly used with EXTENDED messages */
uchar outgoing_msg[8]; /* send this during next message_out */
int outgoing_len; /* length of outgoing message */
unsigned int default_sx_per; /* default transfer period for SCSI bus */
uchar sync_xfer[8]; /* sync_xfer reg settings per target */
uchar sync_stat[8]; /* status of sync negotiation per target */
uchar no_sync; /* bitmask: don't do sync on these targets */
uchar no_dma; /* set this flag to disable DMA */
uchar dma_mode; /* DMA Burst Mode or Single Byte DMA */
uchar fast; /* set this flag to enable Fast SCSI */
struct sx_period sx_table[9]; /* transfer periods for actual DTC-setting */
#ifdef PROC_INTERFACE
uchar proc; /* bitmask: what's in proc output */
#ifdef PROC_STATISTICS
unsigned long cmd_cnt[8]; /* # of commands issued per target */
unsigned long int_cnt; /* # of interrupts serviced */
unsigned long pio_cnt; /* # of pio data transfers */
unsigned long dma_cnt; /* # of DMA data transfers */
unsigned long disc_allowed_cnt[8]; /* # of disconnects allowed per target */
unsigned long disc_done_cnt[8]; /* # of disconnects done per target*/
#endif
#endif
};
/* defines for hostdata->chip */
#define C_WD33C93 0
#define C_WD33C93A 1
#define C_WD33C93B 2
#define C_UNKNOWN_CHIP 100
/* defines for hostdata->state */
#define S_UNCONNECTED 0
#define S_SELECTING 1
#define S_RUNNING_LEVEL2 2
#define S_CONNECTED 3
#define S_PRE_TMP_DISC 4
#define S_PRE_CMP_DISC 5
/* defines for hostdata->dma */
#define D_DMA_OFF 0
#define D_DMA_RUNNING 1
/* defines for hostdata->level2 */
/* NOTE: only the first 3 are implemented so far */
#define L2_NONE 1 /* no combination commands - we get lots of ints */
#define L2_SELECT 2 /* start with SEL_ATN_XFER, but never resume it */
#define L2_BASIC 3 /* resume after STATUS ints & RDP messages */
#define L2_DATA 4 /* resume after DATA_IN/OUT ints */
#define L2_MOST 5 /* resume after anything except a RESELECT int */
#define L2_RESELECT 6 /* resume after everything, including RESELECT ints */
#define L2_ALL 7 /* always resume */
/* defines for hostdata->disconnect */
#define DIS_NEVER 0
#define DIS_ADAPTIVE 1
#define DIS_ALWAYS 2
/* defines for hostdata->args */
#define DB_TEST1 1<<0
#define DB_TEST2 1<<1
#define DB_QUEUE_COMMAND 1<<2
#define DB_EXECUTE 1<<3
#define DB_INTR 1<<4
#define DB_TRANSFER 1<<5
#define DB_MASK 0x3f
/* defines for hostdata->sync_stat[] */
#define SS_UNSET 0
#define SS_FIRST 1
#define SS_WAITING 2
#define SS_SET 3
/* defines for hostdata->proc */
#define PR_VERSION 1<<0
#define PR_INFO 1<<1
#define PR_STATISTICS 1<<2
#define PR_CONNECTED 1<<3
#define PR_INPUTQ 1<<4
#define PR_DISCQ 1<<5
#define PR_TEST 1<<6
#define PR_STOP 1<<7
void wd33c93_init (struct Scsi_Host *instance, const wd33c93_regs regs,
dma_setup_t setup, dma_stop_t stop, int clock_freq);
int wd33c93_abort (struct scsi_cmnd *cmd);
int wd33c93_queuecommand (struct Scsi_Host *h, struct scsi_cmnd *cmd);
void wd33c93_intr (struct Scsi_Host *instance);
int wd33c93_proc_info(struct Scsi_Host *, char *, char **, off_t, int, int);
int wd33c93_host_reset (struct scsi_cmnd *);
#endif /* WD33C93_H */
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