/* SPDX-License-Identifier: GPL-2.0-only */
/*
* linux / drivers / acorn / scsi / fas216 . h
*
* Copyright ( C ) 1997 - 2000 Russell King
*
* FAS216 generic driver
*/
#ifndef FAS216_H
#define FAS216_H
#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 0 x00
#define CMD_FLUSHFIFO 0 x01
#define CMD_RESETCHIP 0 x02
#define CMD_RESETSCSI 0 x03
#define CMD_TRANSFERINFO 0 x10
#define CMD_INITCMDCOMPLETE 0 x11
#define CMD_MSGACCEPTED 0 x12
#define CMD_PADBYTES 0 x18
#define CMD_SETATN 0 x1a
#define CMD_RSETATN 0 x1b
#define CMD_SELECTWOATN 0 x41
#define CMD_SELECTATN 0 x42
#define CMD_SELECTATNSTOP 0 x43
#define CMD_ENABLESEL 0 x44
#define CMD_DISABLESEL 0 x45
#define CMD_SELECTATN3 0 x46
#define CMD_RESEL3 0 x47
#define CMD_WITHDMA 0 x80
/* 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 0 x07
#define IS_SELARB 0 x00 /* Select & Arb ok */
#define IS_MSGBYTESENT 0 x01 /* One byte message sent*/
#define IS_NOTCOMMAND 0 x02 /* Not in command state */
#define IS_EARLYPHASE 0 x03 /* Early phase change */
#define IS_COMPLETE 0 x04 /* Command ok */
#define IS_SOF 0 x08 /* 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 0 x1f /* Num bytes in FIFO */
#define CFIS_IS 0 xe0 /* 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 0 x00 /* 35.01 - 40 MHz */
#define CLKF_F10MHZ 0 x02 /* 10 MHz */
#define CLKF_F12MHZ 0 x03 /* 10.01 - 15 MHz */
#define CLKF_F17MHZ 0 x04 /* 15.01 - 20 MHz */
#define CLKF_F22MHZ 0 x05 /* 20.01 - 25 MHz */
#define CLKF_F27MHZ 0 x06 /* 25.01 - 30 MHz */
#define CLKF_F32MHZ 0 x07 /* 30.01 - 35 MHz */
/* Chip test register (write) */
#define REG_FTM (10 )
#define TEST_FTM 0 x01 /* Force target mode */
#define TEST_FIM 0 x02 /* Force initiator mode */
#define TEST_FHI 0 x04 /* 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, /* Negotiate with device */
neg_inprogress, /* Negotiation sent */
neg_complete, /* Negotiation complete */
neg_targcomplete, /* Target completed negotiation */
neg_invalid /* Negotiation not supported */
} neg_t;
#define MAGIC 0 x441296bdUL
#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;
/* driver-private data per SCSI command. */
struct fas216_cmd_priv {
/*
* @ scsi_pointer must be the first member . See also arm_scsi_pointer ( ) .
*/
struct scsi_pointer scsi_pointer;
void (*scsi_done)(struct scsi_cmnd *cmd);
};
static inline struct fas216_cmd_priv *fas216_cmd_priv(struct scsi_cmnd *cmd)
{
return scsi_cmd_priv(cmd);
}
/* 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 void fas216_print_host(FAS216_Info *info, struct seq_file *m);
extern void fas216_print_stats(FAS216_Info *info, struct seq_file *m);
extern void fas216_print_devices(FAS216_Info *info, struct seq_file *m);
/* 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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