sys/dev/tc/ascvar.h

   1 /*      $NetBSD: ascvar.h,v 1.10 2005/12/11 12:24:00 christos Exp $     */
   2
   3
   4 /*
   5  * State kept for each active SCSI device.
   6  */
   7 struct script;
   8
   9 typedef struct scsi_state {
  10         struct script *script;  /* saved script while processing error */
  11         int     statusByte;     /* status byte returned during STATUS_PHASE */
  12         int     error;          /* errno to pass back to device driver */
  13         u_char  *dmaBufAddr;    /* DMA buffer address */
  14         int     dmalen;         /* amount to transfer in this chunk */
  15         int     dmaresid;       /* amount not transfered if chunk suspended */
  16         int     buflen;         /* total remaining amount of data to transfer */
  17         char    *buf;           /* current pointer within scsicmd->buf */
  18         int     flags;          /* see below */
  19         int     msglen;         /* number of message bytes to read */
  20         int     msgcnt;         /* number of message bytes received */
  21         u_char  sync_period;    /* DMA synchronous period */
  22         u_char  sync_offset;    /* DMA synchronous xfer offset or 0 if async */
  23         u_char  msg_out;        /* next MSG_OUT byte to send */
  24         u_char  msg_in[16];     /* buffer for multibyte messages */
  25 } State;
  26
  27 /* state flags */
  28 #define DISCONN         0x001   /* true if currently disconnected from bus */
  29 #define DMA_IN_PROGRESS 0x002   /* true if data DMA started */
  30 #define DMA_IN          0x004   /* true if reading from SCSI device */
  31 #define DMA_RESUME      0x008   /* true if DMA was interrupted by disc. */
  32 #define DMA_OUT         0x010   /* true if writing to SCSI device */
  33 #define DID_SYNC        0x020   /* true if synchronous offset was negotiated */
  34 #define TRY_SYNC        0x040   /* true if try neg. synchronous offset */
  35 #define PARITY_ERR      0x080   /* true if parity error seen */
  36 #define CHECK_SENSE     0x100   /* true if doing sense command */
  37
  38
  39 /*
  40  * State kept for each active SCSI host interface (53C94).
  41  */
  42
  43 struct asc_softc {
  44         struct device sc_dev;                   /* us as a device */
  45
  46         bus_space_tag_t sc_bst;
  47         bus_space_handle_t sc_bsh;
  48         bus_space_handle_t sc_scsi_bsh;
  49         bus_dma_tag_t sc_dmat;
  50         bus_dmamap_t sc_dmamap;
  51
  52         asc_regmap_t    *regs;          /* chip address */
  53         volatile int    *dmar;          /* DMA address register address */
  54         int             sc_id;          /* SCSI ID of this interface */
  55         int             myidmask;       /* ~(1 << myid) */
  56         int             state;          /* current SCSI connection state */
  57         int             target;         /* target SCSI ID if busy */
  58         struct script   *script;        /* next expected interrupt & action */
  59         ScsiCmd         *cmd[ASC_NCMD]; /* active command indexed by SCSI ID */
  60         State           st[ASC_NCMD];   /* state info for each active command */
  61         /* Start DMA routine */
  62         int  (*dma_start)(struct asc_softc *asc,
  63                                 struct scsi_state *state,
  64                                 void *cp, int flag, int len, int off);
  65         /* End DMA routine */
  66         void    (*dma_end)(struct asc_softc *asc,
  67                                 struct scsi_state *state, int flag);
  68
  69         u_char          *dma_next;
  70         int             dma_xfer;       /* DMA len still to go */
  71         int             min_period;     /* Min transfer period clk/byte */
  72         int             max_period;     /* Max transfer period clk/byte */
  73         int             ccf;            /* CCF, whatever that really is? */
  74         int             timeout_250;    /* 250ms timeout */
  75         int             tb_ticks;       /* 4ns. ticks/tb channel ticks */
  76 };
  77 typedef struct asc_softc *asc_softc_t;
  78
  79 #define ASC_STATE_IDLE          0       /* idle state */
  80 #define ASC_STATE_BUSY          1       /* selecting or currently connected */
  81 #define ASC_STATE_TARGET        2       /* currently selected as target */
  82 #define ASC_STATE_RESEL         3       /* currently waiting for reselect */
  83
  84
  85 #define ASC_SPEED_25_MHZ        250
  86 #define ASC_SPEED_12_5_MHZ      125
  87
  88 void    ascattach(struct asc_softc *asc, int bus_speed);
  89 int     asc_intr(void *asc);
  90
  91 /*
  92  * DMA operations.
  93  */
  94 #define ASCDMA_READ     1
  95 #define ASCDMA_WRITE    2