mesh.h
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上传日期:2013-02-24
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- /*
- * mesh.h: definitions for the driver for the MESH SCSI bus adaptor
- * (Macintosh Enhanced SCSI Hardware) found on Power Macintosh computers.
- *
- * Copyright (C) 1996 Paul Mackerras.
- */
- #ifndef _MESH_H
- #define _MESH_H
- int mesh_detect(Scsi_Host_Template *);
- int mesh_release(struct Scsi_Host *);
- int mesh_command(Scsi_Cmnd *);
- int mesh_queue(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
- int mesh_abort(Scsi_Cmnd *);
- int mesh_reset(Scsi_Cmnd *, unsigned int);
- #define SCSI_MESH {
- proc_name: "mesh",
- name: "MESH",
- detect: mesh_detect,
- release: mesh_release,
- command: mesh_command,
- queuecommand: mesh_queue,
- abort: mesh_abort,
- reset: mesh_reset,
- can_queue: 20,
- this_id: 7,
- sg_tablesize: SG_ALL,
- cmd_per_lun: 2,
- use_clustering: DISABLE_CLUSTERING,
- use_new_eh_code: 1,
- }
- /*
- * Registers in the MESH controller.
- */
- struct mesh_regs {
- unsigned char count_lo;
- char pad0[15];
- unsigned char count_hi;
- char pad1[15];
- unsigned char fifo;
- char pad2[15];
- unsigned char sequence;
- char pad3[15];
- unsigned char bus_status0;
- char pad4[15];
- unsigned char bus_status1;
- char pad5[15];
- unsigned char fifo_count;
- char pad6[15];
- unsigned char exception;
- char pad7[15];
- unsigned char error;
- char pad8[15];
- unsigned char intr_mask;
- char pad9[15];
- unsigned char interrupt;
- char pad10[15];
- unsigned char source_id;
- char pad11[15];
- unsigned char dest_id;
- char pad12[15];
- unsigned char sync_params;
- char pad13[15];
- unsigned char mesh_id;
- char pad14[15];
- unsigned char sel_timeout;
- char pad15[15];
- };
- /* Bits in the sequence register. */
- #define SEQ_DMA_MODE 0x80 /* use DMA for data transfer */
- #define SEQ_TARGET 0x40 /* put the controller into target mode */
- #define SEQ_ATN 0x20 /* assert ATN signal */
- #define SEQ_ACTIVE_NEG 0x10 /* use active negation on REQ/ACK */
- #define SEQ_CMD 0x0f /* command bits: */
- #define SEQ_ARBITRATE 1 /* get the bus */
- #define SEQ_SELECT 2 /* select a target */
- #define SEQ_COMMAND 3 /* send a command */
- #define SEQ_STATUS 4 /* receive status */
- #define SEQ_DATAOUT 5 /* send data */
- #define SEQ_DATAIN 6 /* receive data */
- #define SEQ_MSGOUT 7 /* send a message */
- #define SEQ_MSGIN 8 /* receive a message */
- #define SEQ_BUSFREE 9 /* look for bus free */
- #define SEQ_ENBPARITY 0x0a /* enable parity checking */
- #define SEQ_DISPARITY 0x0b /* disable parity checking */
- #define SEQ_ENBRESEL 0x0c /* enable reselection */
- #define SEQ_DISRESEL 0x0d /* disable reselection */
- #define SEQ_RESETMESH 0x0e /* reset the controller */
- #define SEQ_FLUSHFIFO 0x0f /* clear out the FIFO */
- /* Bits in the bus_status0 and bus_status1 registers:
- these correspond directly to the SCSI bus control signals. */
- #define BS0_REQ 0x20
- #define BS0_ACK 0x10
- #define BS0_ATN 0x08
- #define BS0_MSG 0x04
- #define BS0_CD 0x02
- #define BS0_IO 0x01
- #define BS1_RST 0x80
- #define BS1_BSY 0x40
- #define BS1_SEL 0x20
- /* Bus phases defined by the bits in bus_status0 */
- #define BS0_PHASE (BS0_MSG+BS0_CD+BS0_IO)
- #define BP_DATAOUT 0
- #define BP_DATAIN BS0_IO
- #define BP_COMMAND BS0_CD
- #define BP_STATUS (BS0_CD+BS0_IO)
- #define BP_MSGOUT (BS0_MSG+BS0_CD)
- #define BP_MSGIN (BS0_MSG+BS0_CD+BS0_IO)
- /* Bits in the exception register. */
- #define EXC_SELWATN 0x20 /* (as target) we were selected with ATN */
- #define EXC_SELECTED 0x10 /* (as target) we were selected w/o ATN */
- #define EXC_RESELECTED 0x08 /* (as initiator) we were reselected */
- #define EXC_ARBLOST 0x04 /* we lost arbitration */
- #define EXC_PHASEMM 0x02 /* SCSI phase mismatch */
- #define EXC_SELTO 0x01 /* selection timeout */
- /* Bits in the error register */
- #define ERR_UNEXPDISC 0x40 /* target unexpectedly disconnected */
- #define ERR_SCSIRESET 0x20 /* SCSI bus got reset on us */
- #define ERR_SEQERR 0x10 /* we did something the chip didn't like */
- #define ERR_PARITY 0x01 /* parity error was detected */
- /* Bits in the interrupt and intr_mask registers */
- #define INT_ERROR 0x04 /* error interrupt */
- #define INT_EXCEPTION 0x02 /* exception interrupt */
- #define INT_CMDDONE 0x01 /* command done interrupt */
- /* Fields in the sync_params register */
- #define SYNC_OFF(x) ((x) >> 4) /* offset field */
- #define SYNC_PER(x) ((x) & 0xf) /* period field */
- #define SYNC_PARAMS(o, p) (((o) << 4) | (p))
- #define ASYNC_PARAMS 2 /* sync_params value for async xfers */
- /*
- * Assuming a clock frequency of 50MHz:
- *
- * The transfer period with SYNC_PER(sync_params) == x
- * is (x + 2) * 40ns, except that x == 0 gives 100ns.
- *
- * The units of the sel_timeout register are 10ms.
- */
- #endif /* _MESH_H */