diff options
Diffstat (limited to 'sys/alpha/tc/ascvar.h')
| -rw-r--r-- | sys/alpha/tc/ascvar.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/sys/alpha/tc/ascvar.h b/sys/alpha/tc/ascvar.h new file mode 100644 index 0000000..7132925 --- /dev/null +++ b/sys/alpha/tc/ascvar.h @@ -0,0 +1,92 @@ +/* $Id$ */ +/* $NetBSD: ascvar.h,v 1.4 1997/11/28 18:23:40 mhitch Exp $ */ + + +/* + * State kept for each active SCSI device. + */ +struct script; + +typedef struct scsi_state { + struct script *script; /* saved script while processing error */ + int statusByte; /* status byte returned during STATUS_PHASE */ + int error; /* errno to pass back to device driver */ + u_char *dmaBufAddr; /* DMA buffer address */ + int dmalen; /* amount to transfer in this chunk */ + int dmaresid; /* amount not transfered if chunk suspended */ + int buflen; /* total remaining amount of data to transfer */ + char *buf; /* current pointer within scsicmd->buf */ + int flags; /* see below */ + int msglen; /* number of message bytes to read */ + int msgcnt; /* number of message bytes received */ + u_char sync_period; /* DMA synchronous period */ + u_char sync_offset; /* DMA synchronous xfer offset or 0 if async */ + u_char msg_out; /* next MSG_OUT byte to send */ + u_char msg_in[16]; /* buffer for multibyte messages */ +} State; + +/* state flags */ +#define DISCONN 0x001 /* true if currently disconnected from bus */ +#define DMA_IN_PROGRESS 0x002 /* true if data DMA started */ +#define DMA_IN 0x004 /* true if reading from SCSI device */ +#define DMA_RESUME 0x08 /* true if DMA was interrupted by disc. */ +#define DMA_OUT 0x010 /* true if writing to SCSI device */ +#define DID_SYNC 0x020 /* true if synchronous offset was negotiated */ +#define TRY_SYNC 0x040 /* true if try neg. synchronous offset */ +#define PARITY_ERR 0x080 /* true if parity error seen */ +#define CHECK_SENSE 0x100 /* true if doing sense command */ + + +/* + * State kept for each active SCSI host interface (53C94). + */ + +struct asc_softc { + struct device sc_dev; /* us as a device */ + asc_regmap_t *regs; /* chip address */ + volatile int *dmar; /* DMA address register address */ + int sc_id; /* SCSI ID of this interface */ + int myidmask; /* ~(1 << myid) */ + int state; /* current SCSI connection state */ + int target; /* target SCSI ID if busy */ + struct script *script; /* next expected interrupt & action */ + ScsiCmd *cmd[ASC_NCMD]; /* active command indexed by SCSI ID */ + State st[ASC_NCMD]; /* state info for each active command */ + /* Start dma routine */ + int (*dma_start) __P((struct asc_softc *asc, + struct scsi_state *state, + caddr_t cp, int flag, int len, int off)); + /* End dma routine */ + void (*dma_end) __P((struct asc_softc *asc, + struct scsi_state *state, int flag)); + + u_char *dma_next; + int dma_xfer; /* Dma len still to go */ + int min_period; /* Min transfer period clk/byte */ + int max_period; /* Max transfer period clk/byte */ + int ccf; /* CCF, whatever that really is? */ + int timeout_250; /* 250ms timeout */ + int tb_ticks; /* 4ns. ticks/tb channel ticks */ +#ifdef USE_NEW_SCSI + struct scsipi_link sc_link; /* scsipi link struct */ +#endif +}; +typedef struct asc_softc *asc_softc_t; + +#define ASC_STATE_IDLE 0 /* idle state */ +#define ASC_STATE_BUSY 1 /* selecting or currently connected */ +#define ASC_STATE_TARGET 2 /* currently selected as target */ +#define ASC_STATE_RESEL 3 /* currently waiting for reselect */ + + +#define ASC_SPEED_25_MHZ 250 +#define ASC_SPEED_12_5_MHZ 125 + +void ascattach __P((struct asc_softc *asc, int bus_speed)); +int asc_intr __P ((void *asc)); + +/* + * Dma operations. + */ +#define ASCDMA_READ 1 +#define ASCDMA_WRITE 2 |
