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kernel_optimize_test/drivers/scsi/wd33c93.h
peter fuerst a5d8421b2f [SCSI] wd33c93: Fast SCSI with WD33C93B 
Attached are patches, which help to utilize more of the WD33C93B SCSI
controller's capabilities.

1) Added/changed all the necessary code to enable Burst Mode DMA. Only
   Single Byte DMA was used before.

2) Added/changed all the necessary code to enable Fast-10 SCSI transfers.

3) The original driver inadvertently used a transfer period of 1000-800ns
   (the lowest possible transfer rate) for asynchronous data transfers,
   instead of the (configurable) default period intended for this purpose,
   if the target responded to a SDTR not with a Reject-message, but with
   a zero-SDTR. This issue was fixed.
   Moreover, in case of a Reject the driver used the default-period's
   initialization-value instead of its (maybe smaller) current value. The
   missing assignment was added.

4) The driver's commandline- and proc-file-interface was augmented to
   handle the new options properly.

The WD33C93 manual, found at
http://www.datasheet.in/datasheet-html/W/D/3/WD33C93B_WesternDigital.pdf.html,
was very helpful.

Signed-off-by: peter fuerst <post@pfrst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-02-16 09:22:11 -06:00

354 lines
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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 explicitely. 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_cmnd *cmd,
void (*done)(struct scsi_cmnd *));
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 *);
void wd33c93_release(void);
#endif /* WD33C93_H */
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