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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/mesh.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/scsi/mesh.h')
-rw-r--r--drivers/scsi/mesh.h127
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/scsi/mesh.h b/drivers/scsi/mesh.h
new file mode 100644
index 000000000000..4fdb81fa55e2
--- /dev/null
+++ b/drivers/scsi/mesh.h
@@ -0,0 +1,127 @@
+/*
+ * 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 */