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[src/trunk]: src/sys/arch/arc/dev Moved from /cvsroot/syssrc/sys/arch/pica/de...
details: https://anonhg.NetBSD.org/src/rev/ed615e230e08
branches: trunk
changeset: 480956:ed615e230e08
user: soda <soda%NetBSD.org@localhost>
date: Sun Jan 23 20:08:05 2000 +0000
description:
Moved from /cvsroot/syssrc/sys/arch/pica/dev/asc.c,v
diffstat:
sys/arch/arc/dev/asc.c | 2066 ++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 2066 insertions(+), 0 deletions(-)
diffs (truncated from 2070 to 300 lines):
diff -r 402974cd097d -r ed615e230e08 sys/arch/arc/dev/asc.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arc/dev/asc.c Sun Jan 23 20:08:05 2000 +0000
@@ -0,0 +1,2066 @@
+/* $NetBSD: asc.c,v 1.19 2000/01/23 20:08:06 soda Exp $ */
+
+/*-
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Ralph Campbell and Rick Macklem.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)asc.c 8.3 (Berkeley) 7/3/94
+ */
+
+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ * Software Distribution Coordinator or Software.Distribution%CS.CMU.EDU@localhost
+ * School of Computer Science
+ * Carnegie Mellon University
+ * Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie the
+ * rights to redistribute these changes.
+ */
+
+/*
+ * HISTORY
+ * Log: scsi_53C94_hdw.c,v
+ * Revision 2.5 91/02/05 17:45:07 mrt
+ * Added author notices
+ * [91/02/04 11:18:43 mrt]
+ *
+ * Changed to use new Mach copyright
+ * [91/02/02 12:17:20 mrt]
+ *
+ * Revision 2.4 91/01/08 15:48:24 rpd
+ * Added continuation argument to thread_block.
+ * [90/12/27 rpd]
+ *
+ * Revision 2.3 90/12/05 23:34:48 af
+ * Recovered from pmax merge.. and from the destruction of a disk.
+ * [90/12/03 23:40:40 af]
+ *
+ * Revision 2.1.1.1 90/11/01 03:39:09 af
+ * Created, from the DEC specs:
+ * "PMAZ-AA TURBOchannel SCSI Module Functional Specification"
+ * Workstation Systems Engineering, Palo Alto, CA. Aug 27, 1990.
+ * And from the NCR data sheets
+ * "NCR 53C94, 53C95, 53C96 Advances SCSI Controller"
+ * [90/09/03 af]
+ */
+
+/*
+ * File: scsi_53C94_hdw.h
+ * Author: Alessandro Forin, Carnegie Mellon University
+ * Date: 9/90
+ *
+ * Bottom layer of the SCSI driver: chip-dependent functions
+ *
+ * This file contains the code that is specific to the NCR 53C94
+ * SCSI chip (Host Bus Adapter in SCSI parlance): probing, start
+ * operation, and interrupt routine.
+ */
+
+/*
+ * This layer works based on small simple 'scripts' that are installed
+ * at the start of the command and drive the chip to completion.
+ * The idea comes from the specs of the NCR 53C700 'script' processor.
+ *
+ * There are various reasons for this, mainly
+ * - Performance: identify the common (successful) path, and follow it;
+ * at interrupt time no code is needed to find the current status
+ * - Code size: it should be easy to compact common operations
+ * - Adaptability: the code skeleton should adapt to different chips without
+ * terrible complications.
+ * - Error handling: and it is easy to modify the actions performed
+ * by the scripts to cope with strange but well identified sequences
+ *
+ */
+
+#include <asc.h>
+#if NASC > 0
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/dkstat.h>
+#include <sys/buf.h>
+#include <sys/proc.h>
+#include <sys/conf.h>
+#include <sys/errno.h>
+#include <sys/device.h>
+
+#include <dev/scsipi/scsi_all.h>
+#include <dev/scsipi/scsipi_all.h>
+#include <dev/scsipi/scsiconf.h>
+
+#include <machine/cpu.h>
+#include <machine/autoconf.h>
+#include <machine/bus.h>
+
+#include <pica/dev/dma.h>
+#include <pica/dev/scsi.h>
+#include <pica/dev/ascreg.h>
+
+#include <pica/pica/pica.h>
+#include <pica/pica/picatype.h>
+
+
+#define readback(a) { register int foo; foo = (a); }
+extern int cputype;
+
+/*
+ * In 4ns ticks.
+ */
+int asc_to_scsi_period[] = {
+ 32,
+ 33,
+ 34,
+ 35,
+ 5,
+ 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,
+};
+
+/*
+ * Internal forward declarations.
+ */
+static void asc_reset();
+static void asc_startcmd();
+
+#ifdef DEBUG
+int asc_debug = 1;
+int asc_debug_cmd;
+int asc_debug_bn;
+int asc_debug_sz;
+#define NLOG 16
+struct asc_log {
+ u_int status;
+ u_char state;
+ u_char msg;
+ int target;
+ int resid;
+} asc_log[NLOG], *asc_logp = asc_log;
+#define PACK(unit, status, ss, ir) \
+ ((unit << 24) | (status << 16) | (ss << 8) | ir)
+#endif
+
+/*
+ * Scripts are entries in a state machine table.
+ * A script has four parts: a pre-condition, an action, a command to the chip,
+ * and an index into asc_scripts for the next state. The first triggers error
+ * handling if not satisfied and in our case it is formed by the
+ * values of the interrupt register and status register, this
+ * basically captures the phase of the bus and the TC and BS
+ * bits. The action part is just a function pointer, and the
+ * command is what the 53C94 should be told to do at the end
+ * of the action processing. This command is only issued and the
+ * script proceeds if the action routine returns TRUE.
+ * See asc_intr() for how and where this is all done.
+ */
+typedef struct script {
+ int condition; /* expected state at interrupt time */
+ int (*action)(); /* extra operations */
+ int command; /* command to the chip */
+ struct script *next; /* index into asc_scripts for next state */
+} script_t;
+
+/* Matching on the condition value */
+#define SCRIPT_MATCH(ir, csr) ((ir) | (((csr) & 0x67) << 8))
+
+/* forward decls of script actions */
+static int script_nop(); /* when nothing needed */
+static int asc_end(); /* all come to an end */
+static int asc_get_status(); /* get status from target */
+static int asc_dma_in(); /* start reading data from target */
+static int asc_last_dma_in(); /* cleanup after all data is read */
+static int asc_resume_in(); /* resume data in after a message */
+static int asc_resume_dma_in(); /* resume DMA after a disconnect */
+static int asc_dma_out(); /* send data to target via dma */
+static int asc_last_dma_out(); /* cleanup after all data is written */
+static int asc_resume_out(); /* resume data out after a message */
+static int asc_resume_dma_out(); /* resume DMA after a disconnect */
+static int asc_sendsync(); /* negotiate sync xfer */
+static int asc_replysync(); /* negotiate sync xfer */
+static int asc_msg_in(); /* process a message byte */
+static int asc_disconnect(); /* process an expected disconnect */
+
+/* Define the index into asc_scripts for various state transitions */
+#define SCRIPT_DATA_IN 0
+#define SCRIPT_CONTINUE_IN 2
+#define SCRIPT_DATA_OUT 3
+#define SCRIPT_CONTINUE_OUT 5
+#define SCRIPT_SIMPLE 6
+#define SCRIPT_GET_STATUS 7
+#define SCRIPT_DONE 8
+#define SCRIPT_MSG_IN 9
+#define SCRIPT_REPLY_SYNC 11
+#define SCRIPT_TRY_SYNC 12
+#define SCRIPT_DISCONNECT 15
+#define SCRIPT_RESEL 16
+#define SCRIPT_RESUME_IN 17
+#define SCRIPT_RESUME_DMA_IN 18
+#define SCRIPT_RESUME_OUT 19
+#define SCRIPT_RESUME_DMA_OUT 20
+#define SCRIPT_RESUME_NO_DATA 21
+
+/*
+ * Scripts
+ */
+script_t asc_scripts[] = {
+ /* start data in */
+ {SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_DATAI), /* 0 */
+ asc_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
+ &asc_scripts[SCRIPT_DATA_IN + 1]},
+ {SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_STATUS), /* 1 */
+ asc_last_dma_in, ASC_CMD_I_COMPLETE,
+ &asc_scripts[SCRIPT_GET_STATUS]},
+
+ /* continue data in after a chunk is finished */
+ {SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAI), /* 2 */
+ asc_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
+ &asc_scripts[SCRIPT_DATA_IN + 1]},
+
+ /* start data out */
+ {SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_DATAO), /* 3 */
+ asc_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
+ &asc_scripts[SCRIPT_DATA_OUT + 1]},
+ {SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_STATUS), /* 4 */
+ asc_last_dma_out, ASC_CMD_I_COMPLETE,
+ &asc_scripts[SCRIPT_GET_STATUS]},
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