1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | /* * 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 /* * 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 */ |