1963 lines
52 KiB
C
1963 lines
52 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ralph Campbell and Rick Macklem.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)asc.c 8.2 (Berkeley) 1/4/94
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* $Id: asc.c,v 1.4 1994/05/27 08:39:14 glass Exp $
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1991,1990,1989 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* HISTORY
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* Log: scsi_53C94_hdw.c,v
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* Revision 2.5 91/02/05 17:45:07 mrt
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* Added author notices
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* [91/02/04 11:18:43 mrt]
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*
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* Changed to use new Mach copyright
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* [91/02/02 12:17:20 mrt]
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*
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* Revision 2.4 91/01/08 15:48:24 rpd
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* Added continuation argument to thread_block.
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* [90/12/27 rpd]
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*
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* Revision 2.3 90/12/05 23:34:48 af
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* Recovered from pmax merge.. and from the destruction of a disk.
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* [90/12/03 23:40:40 af]
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*
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* Revision 2.1.1.1 90/11/01 03:39:09 af
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* Created, from the DEC specs:
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* "PMAZ-AA TURBOchannel SCSI Module Functional Specification"
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* Workstation Systems Engineering, Palo Alto, CA. Aug 27, 1990.
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* And from the NCR data sheets
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* "NCR 53C94, 53C95, 53C96 Advances SCSI Controller"
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* [90/09/03 af]
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*/
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/*
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* File: scsi_53C94_hdw.h
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* Author: Alessandro Forin, Carnegie Mellon University
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* Date: 9/90
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*
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* Bottom layer of the SCSI driver: chip-dependent functions
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*
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* This file contains the code that is specific to the NCR 53C94
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* SCSI chip (Host Bus Adapter in SCSI parlance): probing, start
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* operation, and interrupt routine.
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*/
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/*
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* This layer works based on small simple 'scripts' that are installed
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* at the start of the command and drive the chip to completion.
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* The idea comes from the specs of the NCR 53C700 'script' processor.
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*
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* There are various reasons for this, mainly
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* - Performance: identify the common (successful) path, and follow it;
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* at interrupt time no code is needed to find the current status
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* - Code size: it should be easy to compact common operations
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* - Adaptability: the code skeleton should adapt to different chips without
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* terrible complications.
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* - Error handling: and it is easy to modify the actions performed
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* by the scripts to cope with strange but well identified sequences
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*
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*/
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#include <asc.h>
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#if NASC > 0
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/dkstat.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/errno.h>
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#include <machine/machConst.h>
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#include <pmax/dev/device.h>
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#include <pmax/dev/scsi.h>
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#include <pmax/dev/ascreg.h>
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#include <pmax/pmax/asic.h>
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#include <pmax/pmax/kmin.h>
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#include <pmax/pmax/pmaxtype.h>
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#define readback(a) { register int foo; foo = (a); }
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extern int pmax_boardtype;
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/*
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* In 4ns ticks.
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*/
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int asc_to_scsi_period[] = {
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32,
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33,
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34,
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35,
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5,
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5,
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6,
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7,
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8,
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9,
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10,
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11,
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12,
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13,
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14,
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15,
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16,
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17,
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18,
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19,
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20,
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21,
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22,
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23,
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24,
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25,
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26,
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27,
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28,
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29,
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30,
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31,
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};
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/*
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* Internal forward declarations.
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*/
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static void asc_reset();
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static void asc_startcmd();
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#ifdef DEBUG
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int asc_debug = 1;
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int asc_debug_cmd;
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int asc_debug_bn;
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int asc_debug_sz;
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#define NLOG 32
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struct asc_log {
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u_int status;
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u_char state;
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u_char msg;
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int target;
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int resid;
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} asc_log[NLOG], *asc_logp = asc_log;
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#define PACK(unit, status, ss, ir) \
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((unit << 24) | (status << 16) | (ss << 8) | ir)
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#endif
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/*
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* Scripts are entries in a state machine table.
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* A script has four parts: a pre-condition, an action, a command to the chip,
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* and an index into asc_scripts for the next state. The first triggers error
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* handling if not satisfied and in our case it is formed by the
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* values of the interrupt register and status register, this
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* basically captures the phase of the bus and the TC and BS
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* bits. The action part is just a function pointer, and the
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* command is what the 53C94 should be told to do at the end
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* of the action processing. This command is only issued and the
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* script proceeds if the action routine returns TRUE.
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* See asc_intr() for how and where this is all done.
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*/
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typedef struct script {
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int condition; /* expected state at interrupt time */
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int (*action)(); /* extra operations */
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int command; /* command to the chip */
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struct script *next; /* index into asc_scripts for next state */
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} script_t;
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/* Matching on the condition value */
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#define SCRIPT_MATCH(ir, csr) ((ir) | (((csr) & 0x67) << 8))
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/* forward decls of script actions */
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static int script_nop(); /* when nothing needed */
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static int asc_end(); /* all come to an end */
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static int asc_get_status(); /* get status from target */
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static int asc_dma_in(); /* start reading data from target */
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static int asc_last_dma_in(); /* cleanup after all data is read */
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static int asc_resume_in(); /* resume data in after a message */
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static int asc_resume_dma_in(); /* resume DMA after a disconnect */
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static int asc_dma_out(); /* send data to target via dma */
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static int asc_last_dma_out(); /* cleanup after all data is written */
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static int asc_resume_out(); /* resume data out after a message */
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static int asc_resume_dma_out(); /* resume DMA after a disconnect */
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static int asc_sendsync(); /* negotiate sync xfer */
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static int asc_replysync(); /* negotiate sync xfer */
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static int asc_msg_in(); /* process a message byte */
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static int asc_disconnect(); /* process an expected disconnect */
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/* Define the index into asc_scripts for various state transitions */
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#define SCRIPT_DATA_IN 0
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#define SCRIPT_CONTINUE_IN 2
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#define SCRIPT_DATA_OUT 3
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#define SCRIPT_CONTINUE_OUT 5
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#define SCRIPT_SIMPLE 6
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#define SCRIPT_GET_STATUS 7
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#define SCRIPT_MSG_IN 9
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#define SCRIPT_REPLY_SYNC 11
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#define SCRIPT_TRY_SYNC 12
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#define SCRIPT_DISCONNECT 15
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#define SCRIPT_RESEL 16
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#define SCRIPT_RESUME_IN 17
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#define SCRIPT_RESUME_DMA_IN 18
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#define SCRIPT_RESUME_OUT 19
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#define SCRIPT_RESUME_DMA_OUT 20
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#define SCRIPT_RESUME_NO_DATA 21
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/*
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* Scripts
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*/
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script_t asc_scripts[] = {
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/* start data in */
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{SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_DATAI), /* 0 */
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asc_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
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&asc_scripts[SCRIPT_DATA_IN + 1]},
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_STATUS), /* 1 */
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asc_last_dma_in, ASC_CMD_I_COMPLETE,
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&asc_scripts[SCRIPT_GET_STATUS]},
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/* continue data in after a chunk is finished */
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAI), /* 2 */
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asc_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
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&asc_scripts[SCRIPT_DATA_IN + 1]},
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/* start data out */
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{SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_DATAO), /* 3 */
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asc_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
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&asc_scripts[SCRIPT_DATA_OUT + 1]},
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_STATUS), /* 4 */
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asc_last_dma_out, ASC_CMD_I_COMPLETE,
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&asc_scripts[SCRIPT_GET_STATUS]},
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/* continue data out after a chunk is finished */
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAO), /* 5 */
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asc_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
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&asc_scripts[SCRIPT_DATA_OUT + 1]},
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/* simple command with no data transfer */
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{SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_STATUS), /* 6 */
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script_nop, ASC_CMD_I_COMPLETE,
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&asc_scripts[SCRIPT_GET_STATUS]},
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/* get status and finish command */
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{SCRIPT_MATCH(ASC_INT_FC, ASC_PHASE_MSG_IN), /* 7 */
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asc_get_status, ASC_CMD_MSG_ACPT,
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&asc_scripts[SCRIPT_GET_STATUS + 1]},
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{SCRIPT_MATCH(ASC_INT_DISC, 0), /* 8 */
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asc_end, ASC_CMD_NOP,
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&asc_scripts[SCRIPT_GET_STATUS + 1]},
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/* message in */
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{SCRIPT_MATCH(ASC_INT_FC, ASC_PHASE_MSG_IN), /* 9 */
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asc_msg_in, ASC_CMD_MSG_ACPT,
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&asc_scripts[SCRIPT_MSG_IN + 1]},
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_MSG_IN), /* 10 */
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script_nop, ASC_CMD_XFER_INFO,
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&asc_scripts[SCRIPT_MSG_IN]},
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/* send synchonous negotiation reply */
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_MSG_OUT), /* 11 */
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asc_replysync, ASC_CMD_XFER_INFO,
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&asc_scripts[SCRIPT_REPLY_SYNC]},
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/* try to negotiate synchonous transfer parameters */
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{SCRIPT_MATCH(ASC_INT_FC | ASC_INT_BS, ASC_PHASE_MSG_OUT), /* 12 */
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asc_sendsync, ASC_CMD_XFER_INFO,
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&asc_scripts[SCRIPT_TRY_SYNC + 1]},
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_MSG_IN), /* 13 */
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script_nop, ASC_CMD_XFER_INFO,
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&asc_scripts[SCRIPT_MSG_IN]},
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_COMMAND), /* 14 */
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script_nop, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
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&asc_scripts[SCRIPT_RESUME_NO_DATA]},
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/* handle a disconnect */
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{SCRIPT_MATCH(ASC_INT_DISC, ASC_PHASE_DATAO), /* 15 */
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asc_disconnect, ASC_CMD_ENABLE_SEL,
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&asc_scripts[SCRIPT_RESEL]},
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/* reselect sequence: this is just a placeholder so match fails */
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{SCRIPT_MATCH(0, ASC_PHASE_MSG_IN), /* 16 */
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script_nop, ASC_CMD_MSG_ACPT,
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&asc_scripts[SCRIPT_RESEL]},
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/* resume data in after a message */
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAI), /* 17 */
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asc_resume_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
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&asc_scripts[SCRIPT_DATA_IN + 1]},
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/* resume partial DMA data in after a message */
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAI), /* 18 */
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asc_resume_dma_in, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
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&asc_scripts[SCRIPT_DATA_IN + 1]},
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/* resume data out after a message */
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAO), /* 19 */
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asc_resume_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
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&asc_scripts[SCRIPT_DATA_OUT + 1]},
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/* resume partial DMA data out after a message */
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_DATAO), /* 20 */
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asc_resume_dma_out, ASC_CMD_XFER_INFO | ASC_CMD_DMA,
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&asc_scripts[SCRIPT_DATA_OUT + 1]},
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/* resume after a message when there is no more data */
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{SCRIPT_MATCH(ASC_INT_BS, ASC_PHASE_STATUS), /* 21 */
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script_nop, ASC_CMD_I_COMPLETE,
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&asc_scripts[SCRIPT_GET_STATUS]},
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};
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/*
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* State kept for each active SCSI device.
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*/
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typedef struct scsi_state {
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script_t *script; /* saved script while processing error */
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int statusByte; /* status byte returned during STATUS_PHASE */
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int error; /* errno to pass back to device driver */
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u_char *dmaBufAddr; /* DMA buffer address */
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u_int dmaBufSize; /* DMA buffer size */
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int dmalen; /* amount to transfer in this chunk */
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int dmaresid; /* amount not transfered if chunk suspended */
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int buflen; /* total remaining amount of data to transfer */
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char *buf; /* current pointer within scsicmd->buf */
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int flags; /* see below */
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int msglen; /* number of message bytes to read */
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int msgcnt; /* number of message bytes received */
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u_char sync_period; /* DMA synchronous period */
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u_char sync_offset; /* DMA synchronous xfer offset or 0 if async */
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u_char msg_out; /* next MSG_OUT byte to send */
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u_char msg_in[16]; /* buffer for multibyte messages */
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} State;
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/* state flags */
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#define DISCONN 0x01 /* true if currently disconnected from bus */
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#define DMA_IN_PROGRESS 0x02 /* true if data DMA started */
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#define DMA_IN 0x04 /* true if reading from SCSI device */
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#define DMA_OUT 0x10 /* true if writing to SCSI device */
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#define DID_SYNC 0x20 /* true if synchronous offset was negotiated */
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#define TRY_SYNC 0x40 /* true if try neg. synchronous offset */
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#define PARITY_ERR 0x80 /* true if parity error seen */
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/*
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* State kept for each active SCSI host interface (53C94).
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*/
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struct asc_softc {
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asc_regmap_t *regs; /* chip address */
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volatile int *dmar; /* DMA address register address */
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u_char *buff; /* RAM buffer address (uncached) */
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int myid; /* SCSI ID of this interface */
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int myidmask; /* ~(1 << myid) */
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int state; /* current SCSI connection state */
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int target; /* target SCSI ID if busy */
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script_t *script; /* next expected interrupt & action */
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ScsiCmd *cmd[ASC_NCMD]; /* active command indexed by SCSI ID */
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State st[ASC_NCMD]; /* state info for each active command */
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void (*dma_start)(); /* Start dma routine */
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void (*dma_end)(); /* End dma routine */
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u_char *dma_next;
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int dma_xfer; /* Dma len still to go */
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int min_period; /* Min transfer period clk/byte */
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int max_period; /* Max transfer period clk/byte */
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int ccf; /* CCF, whatever that really is? */
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int timeout_250; /* 250ms timeout */
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int tb_ticks; /* 4ns. ticks/tb channel ticks */
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} asc_softc[NASC];
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#define ASC_STATE_IDLE 0 /* idle state */
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#define ASC_STATE_BUSY 1 /* selecting or currently connected */
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#define ASC_STATE_TARGET 2 /* currently selected as target */
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#define ASC_STATE_RESEL 3 /* currently waiting for reselect */
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typedef struct asc_softc *asc_softc_t;
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/*
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* Dma operations.
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*/
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#define ASCDMA_READ 1
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#define ASCDMA_WRITE 2
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static void tb_dma_start(), tb_dma_end(), asic_dma_start(), asic_dma_end();
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extern u_long asc_iomem;
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extern u_long asic_base;
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/*
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* Definition of the controller for the auto-configuration program.
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*/
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int asc_probe();
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void asc_start();
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void asc_intr();
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struct driver ascdriver = {
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"asc", asc_probe, asc_start, 0, asc_intr,
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};
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/*
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* Test to see if device is present.
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* Return true if found and initialized ok.
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*/
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asc_probe(cp)
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register struct pmax_ctlr *cp;
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{
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register asc_softc_t asc;
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register asc_regmap_t *regs;
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int unit, id, s, i;
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int bufsiz;
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if ((unit = cp->pmax_unit) >= NASC)
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return (0);
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if (badaddr(cp->pmax_addr + ASC_OFFSET_53C94, 1))
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return (0);
|
|
asc = &asc_softc[unit];
|
|
|
|
/*
|
|
* Initialize hw descriptor, cache some pointers
|
|
*/
|
|
asc->regs = (asc_regmap_t *)(cp->pmax_addr + ASC_OFFSET_53C94);
|
|
|
|
/*
|
|
* Set up machine dependencies.
|
|
* 1) how to do dma
|
|
* 2) timing based on turbochannel frequency
|
|
*/
|
|
switch (pmax_boardtype) {
|
|
case DS_3MIN:
|
|
case DS_MAXINE:
|
|
case DS_3MAXPLUS:
|
|
if (unit == 0) {
|
|
asc->buff = (u_char *)MACH_PHYS_TO_UNCACHED(asc_iomem);
|
|
bufsiz = 8192;
|
|
*((volatile int *)ASIC_REG_SCSI_DMAPTR(asic_base)) = -1;
|
|
*((volatile int *)ASIC_REG_SCSI_DMANPTR(asic_base)) = -1;
|
|
*((volatile int *)ASIC_REG_SCSI_SCR(asic_base)) = 0;
|
|
asc->dma_start = asic_dma_start;
|
|
asc->dma_end = asic_dma_end;
|
|
break;
|
|
}
|
|
/*
|
|
* Fall through for turbochannel option.
|
|
*/
|
|
case DS_3MAX:
|
|
default:
|
|
asc->dmar = (volatile int *)(cp->pmax_addr + ASC_OFFSET_DMAR);
|
|
asc->buff = (u_char *)(cp->pmax_addr + ASC_OFFSET_RAM);
|
|
bufsiz = PER_TGT_DMA_SIZE;
|
|
asc->dma_start = tb_dma_start;
|
|
asc->dma_end = tb_dma_end;
|
|
};
|
|
/*
|
|
* Now for timing. The 3max has a 25Mhz tb whereas the 3min and
|
|
* maxine are 12.5Mhz.
|
|
*/
|
|
switch (pmax_boardtype) {
|
|
case DS_3MAX:
|
|
case DS_3MAXPLUS:
|
|
asc->min_period = ASC_MIN_PERIOD25;
|
|
asc->max_period = ASC_MAX_PERIOD25;
|
|
asc->ccf = ASC_CCF(25);
|
|
asc->timeout_250 = ASC_TIMEOUT_250(25, asc->ccf);
|
|
asc->tb_ticks = 10;
|
|
break;
|
|
case DS_3MIN:
|
|
case DS_MAXINE:
|
|
default:
|
|
asc->min_period = ASC_MIN_PERIOD12;
|
|
asc->max_period = ASC_MAX_PERIOD12;
|
|
asc->ccf = ASC_CCF(13);
|
|
asc->timeout_250 = ASC_TIMEOUT_250(13, asc->ccf);
|
|
asc->tb_ticks = 20;
|
|
break;
|
|
};
|
|
|
|
asc->state = ASC_STATE_IDLE;
|
|
asc->target = -1;
|
|
|
|
regs = asc->regs;
|
|
|
|
/*
|
|
* Reset chip, fully. Note that interrupts are already enabled.
|
|
*/
|
|
s = splbio();
|
|
|
|
/* preserve our ID for now */
|
|
asc->myid = regs->asc_cnfg1 & ASC_CNFG1_MY_BUS_ID;
|
|
asc->myidmask = ~(1 << asc->myid);
|
|
|
|
asc_reset(asc, regs);
|
|
|
|
/*
|
|
* Our SCSI id on the bus.
|
|
* The user can set this via the prom on 3maxen/pmaxen.
|
|
* If this changes it is easy to fix: make a default that
|
|
* can be changed as boot arg.
|
|
*/
|
|
#ifdef unneeded
|
|
regs->asc_cnfg1 = (regs->asc_cnfg1 & ~ASC_CNFG1_MY_BUS_ID) |
|
|
(scsi_initiator_id[unit] & 0x7);
|
|
#endif
|
|
id = regs->asc_cnfg1 & ASC_CNFG1_MY_BUS_ID;
|
|
splx(s);
|
|
|
|
/*
|
|
* Statically partition the DMA buffer between targets.
|
|
* This way we will eventually be able to attach/detach
|
|
* drives on-fly. And 18k/target is plenty for normal use.
|
|
*/
|
|
|
|
/*
|
|
* Give each target its own DMA buffer region.
|
|
* We may want to try ping ponging buffers later.
|
|
*/
|
|
for (i = 0; i < ASC_NCMD; i++) {
|
|
asc->st[i].dmaBufAddr = asc->buff + bufsiz * i;
|
|
asc->st[i].dmaBufSize = bufsiz;
|
|
}
|
|
printf("asc%d at nexus0 csr 0x%x priority %d SCSI id %d\n",
|
|
unit, cp->pmax_addr, cp->pmax_pri, id);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Start activity on a SCSI device.
|
|
* We maintain information on each device separately since devices can
|
|
* connect/disconnect during an operation.
|
|
*/
|
|
void
|
|
asc_start(scsicmd)
|
|
register ScsiCmd *scsicmd; /* command to start */
|
|
{
|
|
register struct scsi_device *sdp = scsicmd->sd;
|
|
register asc_softc_t asc = &asc_softc[sdp->sd_ctlr];
|
|
int s;
|
|
|
|
s = splbio();
|
|
/*
|
|
* Check if another command is already in progress.
|
|
* We may have to change this if we allow SCSI devices with
|
|
* separate LUNs.
|
|
*/
|
|
if (asc->cmd[sdp->sd_drive]) {
|
|
printf("asc%d: device %s busy at start\n", sdp->sd_ctlr,
|
|
sdp->sd_driver->d_name);
|
|
(*sdp->sd_driver->d_done)(scsicmd->unit, EBUSY,
|
|
scsicmd->buflen, 0);
|
|
splx(s);
|
|
}
|
|
asc->cmd[sdp->sd_drive] = scsicmd;
|
|
asc_startcmd(asc, sdp->sd_drive);
|
|
splx(s);
|
|
}
|
|
|
|
static void
|
|
asc_reset(asc, regs)
|
|
asc_softc_t asc;
|
|
asc_regmap_t *regs;
|
|
{
|
|
|
|
/*
|
|
* Reset chip and wait till done
|
|
*/
|
|
regs->asc_cmd = ASC_CMD_RESET;
|
|
MachEmptyWriteBuffer(); DELAY(25);
|
|
|
|
/* spec says this is needed after reset */
|
|
regs->asc_cmd = ASC_CMD_NOP;
|
|
MachEmptyWriteBuffer(); DELAY(25);
|
|
|
|
/*
|
|
* Set up various chip parameters
|
|
*/
|
|
regs->asc_ccf = asc->ccf;
|
|
MachEmptyWriteBuffer(); DELAY(25);
|
|
regs->asc_sel_timo = asc->timeout_250;
|
|
/* restore our ID */
|
|
regs->asc_cnfg1 = asc->myid | ASC_CNFG1_P_CHECK;
|
|
/* include ASC_CNFG2_SCSI2 if you want to allow SCSI II commands */
|
|
regs->asc_cnfg2 = /* ASC_CNFG2_RFB | ASC_CNFG2_SCSI2 | */ ASC_CNFG2_EPL;
|
|
regs->asc_cnfg3 = 0;
|
|
/* zero anything else */
|
|
ASC_TC_PUT(regs, 0);
|
|
regs->asc_syn_p = asc->min_period;
|
|
regs->asc_syn_o = 0; /* async for now */
|
|
MachEmptyWriteBuffer();
|
|
}
|
|
|
|
/*
|
|
* Start a SCSI command on a target.
|
|
*/
|
|
static void
|
|
asc_startcmd(asc, target)
|
|
asc_softc_t asc;
|
|
int target;
|
|
{
|
|
register asc_regmap_t *regs;
|
|
register ScsiCmd *scsicmd;
|
|
register State *state;
|
|
int len;
|
|
|
|
/*
|
|
* See if another target is currently selected on this SCSI bus.
|
|
*/
|
|
if (asc->target >= 0)
|
|
return;
|
|
|
|
regs = asc->regs;
|
|
|
|
/*
|
|
* If a reselection is in progress, it is Ok to ignore it since
|
|
* the ASC will automatically cancel the command and flush
|
|
* the FIFO if the ASC is reselected before the command starts.
|
|
* If we try to use ASC_CMD_DISABLE_SEL, we can hang the system if
|
|
* a reselect occurs before starting the command.
|
|
*/
|
|
|
|
asc->state = ASC_STATE_BUSY;
|
|
asc->target = target;
|
|
|
|
/* cache some pointers */
|
|
scsicmd = asc->cmd[target];
|
|
state = &asc->st[target];
|
|
|
|
#ifdef DEBUG
|
|
if (asc_debug > 1) {
|
|
printf("asc_startcmd: %s target %d cmd %x len %d\n",
|
|
scsicmd->sd->sd_driver->d_name, target,
|
|
scsicmd->cmd[0], scsicmd->buflen);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Init the chip and target state.
|
|
*/
|
|
state->flags = state->flags & DID_SYNC;
|
|
state->error = 0;
|
|
state->script = (script_t *)0;
|
|
state->msg_out = SCSI_NO_OP;
|
|
|
|
/*
|
|
* Copy command data to the DMA buffer.
|
|
*/
|
|
len = scsicmd->cmdlen;
|
|
state->dmalen = len;
|
|
bcopy(scsicmd->cmd, state->dmaBufAddr, len);
|
|
|
|
/* check for simple SCSI command with no data transfer */
|
|
if ((state->buflen = scsicmd->buflen) == 0) {
|
|
/* check for sync negotiation */
|
|
if ((scsicmd->flags & SCSICMD_USE_SYNC) &&
|
|
!(state->flags & DID_SYNC)) {
|
|
asc->script = &asc_scripts[SCRIPT_TRY_SYNC];
|
|
state->flags |= TRY_SYNC;
|
|
} else
|
|
asc->script = &asc_scripts[SCRIPT_SIMPLE];
|
|
state->buf = (char *)0;
|
|
} else if (scsicmd->flags & SCSICMD_DATA_TO_DEVICE) {
|
|
asc->script = &asc_scripts[SCRIPT_DATA_OUT];
|
|
state->buf = scsicmd->buf;
|
|
state->flags |= DMA_OUT;
|
|
} else {
|
|
asc->script = &asc_scripts[SCRIPT_DATA_IN];
|
|
state->buf = scsicmd->buf;
|
|
state->flags |= DMA_IN;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
asc_debug_cmd = scsicmd->cmd[0];
|
|
if (scsicmd->cmd[0] == SCSI_READ_EXT) {
|
|
asc_debug_bn = (scsicmd->cmd[2] << 24) |
|
|
(scsicmd->cmd[3] << 16) |
|
|
(scsicmd->cmd[4] << 8) |
|
|
scsicmd->cmd[5];
|
|
asc_debug_sz = (scsicmd->cmd[7] << 8) | scsicmd->cmd[8];
|
|
}
|
|
asc_logp->status = PACK(asc - asc_softc, 0, 0, asc_debug_cmd);
|
|
asc_logp->target = asc->target;
|
|
asc_logp->state = asc->script - asc_scripts;
|
|
asc_logp->msg = SCSI_DIS_REC_IDENTIFY;
|
|
asc_logp->resid = scsicmd->buflen;
|
|
if (++asc_logp >= &asc_log[NLOG])
|
|
asc_logp = asc_log;
|
|
#endif
|
|
|
|
/* preload the FIFO with the message to be sent */
|
|
regs->asc_fifo = SCSI_DIS_REC_IDENTIFY;
|
|
MachEmptyWriteBuffer();
|
|
|
|
/* initialize the DMA */
|
|
(*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_WRITE);
|
|
ASC_TC_PUT(regs, len);
|
|
readback(regs->asc_cmd);
|
|
|
|
regs->asc_dbus_id = target;
|
|
readback(regs->asc_dbus_id);
|
|
regs->asc_syn_p = state->sync_period;
|
|
readback(regs->asc_syn_p);
|
|
regs->asc_syn_o = state->sync_offset;
|
|
readback(regs->asc_syn_o);
|
|
|
|
if (state->flags & TRY_SYNC)
|
|
regs->asc_cmd = ASC_CMD_SEL_ATN_STOP;
|
|
else
|
|
regs->asc_cmd = ASC_CMD_SEL_ATN | ASC_CMD_DMA;
|
|
readback(regs->asc_cmd);
|
|
}
|
|
|
|
/*
|
|
* Interrupt routine
|
|
* Take interrupts from the chip
|
|
*
|
|
* Implementation:
|
|
* Move along the current command's script if
|
|
* all is well, invoke error handler if not.
|
|
*/
|
|
void
|
|
asc_intr(unit)
|
|
int unit;
|
|
{
|
|
register asc_softc_t asc = &asc_softc[unit];
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state;
|
|
register script_t *scpt;
|
|
register int ss, ir, status;
|
|
|
|
/* collect ephemeral information */
|
|
status = regs->asc_status;
|
|
again:
|
|
ss = regs->asc_ss;
|
|
ir = regs->asc_intr; /* this resets the previous two */
|
|
scpt = asc->script;
|
|
|
|
#ifdef DEBUG
|
|
asc_logp->status = PACK(unit, status, ss, ir);
|
|
asc_logp->target = (asc->state == ASC_STATE_BUSY) ? asc->target : -1;
|
|
asc_logp->state = scpt - asc_scripts;
|
|
asc_logp->msg = -1;
|
|
asc_logp->resid = 0;
|
|
if (++asc_logp >= &asc_log[NLOG])
|
|
asc_logp = asc_log;
|
|
if (asc_debug > 2)
|
|
printf("asc_intr: status %x ss %x ir %x cond %d:%x\n",
|
|
status, ss, ir, scpt - asc_scripts, scpt->condition);
|
|
#endif
|
|
|
|
/* check the expected state */
|
|
if (SCRIPT_MATCH(ir, status) == scpt->condition) {
|
|
/*
|
|
* Perform the appropriate operation, then proceed.
|
|
*/
|
|
if ((*scpt->action)(asc, status, ss, ir)) {
|
|
regs->asc_cmd = scpt->command;
|
|
readback(regs->asc_cmd);
|
|
asc->script = scpt->next;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Check for parity error.
|
|
* Hardware will automatically set ATN
|
|
* to request the device for a MSG_OUT phase.
|
|
*/
|
|
if (status & ASC_CSR_PE) {
|
|
printf("asc%d: SCSI device %d: incomming parity error seen\n",
|
|
asc - asc_softc, asc->target);
|
|
asc->st[asc->target].flags |= PARITY_ERR;
|
|
}
|
|
|
|
/*
|
|
* Check for gross error.
|
|
* Probably a bug in a device driver.
|
|
*/
|
|
if (status & ASC_CSR_GE) {
|
|
printf("asc%d: SCSI device %d: gross error\n",
|
|
asc - asc_softc, asc->target);
|
|
goto abort;
|
|
}
|
|
|
|
/* check for message in or out */
|
|
if ((ir & ~ASC_INT_FC) == ASC_INT_BS) {
|
|
register int len, fifo;
|
|
|
|
state = &asc->st[asc->target];
|
|
switch (ASC_PHASE(status)) {
|
|
case ASC_PHASE_DATAI:
|
|
case ASC_PHASE_DATAO:
|
|
ASC_TC_GET(regs, len);
|
|
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
|
|
printf("asc_intr: data overrun: buflen %d dmalen %d tc %d fifo %d\n",
|
|
state->buflen, state->dmalen, len, fifo);
|
|
goto abort;
|
|
|
|
case ASC_PHASE_MSG_IN:
|
|
break;
|
|
|
|
case ASC_PHASE_MSG_OUT:
|
|
/*
|
|
* Check for parity error.
|
|
* Hardware will automatically set ATN
|
|
* to request the device for a MSG_OUT phase.
|
|
*/
|
|
if (state->flags & PARITY_ERR) {
|
|
state->flags &= ~PARITY_ERR;
|
|
state->msg_out = SCSI_MESSAGE_PARITY_ERROR;
|
|
/* reset message in counter */
|
|
state->msglen = 0;
|
|
} else
|
|
state->msg_out = SCSI_NO_OP;
|
|
regs->asc_fifo = state->msg_out;
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO;
|
|
readback(regs->asc_cmd);
|
|
goto done;
|
|
|
|
case ASC_PHASE_STATUS:
|
|
/* probably an error in the SCSI command */
|
|
asc->script = &asc_scripts[SCRIPT_GET_STATUS];
|
|
regs->asc_cmd = ASC_CMD_I_COMPLETE;
|
|
readback(regs->asc_cmd);
|
|
goto done;
|
|
|
|
default:
|
|
goto abort;
|
|
}
|
|
|
|
if (state->script)
|
|
goto abort;
|
|
|
|
/* check for DMA in progress */
|
|
ASC_TC_GET(regs, len);
|
|
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
|
|
/* flush any data in the FIFO */
|
|
if (fifo) {
|
|
if (state->flags & DMA_OUT)
|
|
len += fifo;
|
|
else if (state->flags & DMA_IN) {
|
|
u_char *cp;
|
|
|
|
printf("asc_intr: IN: dmalen %d len %d fifo %d\n",
|
|
state->dmalen, len, fifo); /* XXX */
|
|
len += fifo;
|
|
cp = state->dmaBufAddr + (state->dmalen - len);
|
|
while (fifo-- > 0)
|
|
*cp++ = regs->asc_fifo;
|
|
} else
|
|
printf("asc_intr: dmalen %d len %d fifo %d\n",
|
|
state->dmalen, len, fifo); /* XXX */
|
|
regs->asc_cmd = ASC_CMD_FLUSH;
|
|
readback(regs->asc_cmd);
|
|
DELAY(2);
|
|
}
|
|
if (len && (state->flags & DMA_IN_PROGRESS)) {
|
|
/* save number of bytes still to be sent or received */
|
|
state->dmaresid = len;
|
|
state->flags &= ~DMA_IN_PROGRESS;
|
|
#ifdef DEBUG
|
|
if (asc_logp == asc_log)
|
|
asc_log[NLOG - 1].resid = len;
|
|
else
|
|
asc_logp[-1].resid = len;
|
|
#endif
|
|
/* setup state to resume to */
|
|
if (state->flags & DMA_IN) {
|
|
/*
|
|
* Since the ASC_CNFG3_SRB bit of the
|
|
* cnfg3 register bit is not set,
|
|
* we just transferred an extra byte.
|
|
* Since we can't resume on an odd byte
|
|
* boundary, we copy the valid data out
|
|
* and resume DMA at the start address.
|
|
*/
|
|
if (len & 1) {
|
|
printf("asc_intr: msg in len %d (fifo %d)\n",
|
|
len, fifo); /* XXX */
|
|
len = state->dmalen - len;
|
|
goto do_in;
|
|
}
|
|
state->script =
|
|
&asc_scripts[SCRIPT_RESUME_DMA_IN];
|
|
} else if (state->flags & DMA_OUT)
|
|
state->script =
|
|
&asc_scripts[SCRIPT_RESUME_DMA_OUT];
|
|
else
|
|
state->script = asc->script;
|
|
} else if (state->flags & DMA_IN) {
|
|
if (len)
|
|
printf("asc_intr: 1: len %d (fifo %d)\n", len,
|
|
fifo); /* XXX */
|
|
/* setup state to resume to */
|
|
if (state->flags & DMA_IN_PROGRESS) {
|
|
len = state->dmalen;
|
|
state->flags &= ~DMA_IN_PROGRESS;
|
|
do_in:
|
|
(*asc->dma_end)(asc, state, ASCDMA_READ);
|
|
bcopy(state->dmaBufAddr, state->buf, len);
|
|
state->buf += len;
|
|
state->buflen -= len;
|
|
}
|
|
if (state->buflen)
|
|
state->script =
|
|
&asc_scripts[SCRIPT_RESUME_IN];
|
|
else
|
|
state->script =
|
|
&asc_scripts[SCRIPT_RESUME_NO_DATA];
|
|
} else if (state->flags & DMA_OUT) {
|
|
if (len)
|
|
printf("asc_intr: 2: len %d (fifo %d)\n", len,
|
|
fifo); /* XXX */
|
|
/*
|
|
* If this is the last chunk, the next expected
|
|
* state is to get status.
|
|
*/
|
|
if (state->flags & DMA_IN_PROGRESS) {
|
|
state->flags &= ~DMA_IN_PROGRESS;
|
|
(*asc->dma_end)(asc, state, ASCDMA_WRITE);
|
|
len = state->dmalen;
|
|
state->buf += len;
|
|
state->buflen -= len;
|
|
}
|
|
if (state->buflen)
|
|
state->script =
|
|
&asc_scripts[SCRIPT_RESUME_OUT];
|
|
else
|
|
state->script =
|
|
&asc_scripts[SCRIPT_RESUME_NO_DATA];
|
|
} else if (asc->script == &asc_scripts[SCRIPT_SIMPLE])
|
|
state->script = &asc_scripts[SCRIPT_RESUME_NO_DATA];
|
|
else
|
|
state->script = asc->script;
|
|
|
|
/* setup to receive a message */
|
|
asc->script = &asc_scripts[SCRIPT_MSG_IN];
|
|
state->msglen = 0;
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO;
|
|
readback(regs->asc_cmd);
|
|
goto done;
|
|
}
|
|
|
|
/* check for SCSI bus reset */
|
|
if (ir & ASC_INT_RESET) {
|
|
register int i;
|
|
|
|
printf("asc%d: SCSI bus reset!!\n", asc - asc_softc);
|
|
/* need to flush any pending commands */
|
|
for (i = 0; i < ASC_NCMD; i++) {
|
|
if (!asc->cmd[i])
|
|
continue;
|
|
asc->st[i].error = EIO;
|
|
asc_end(asc, 0, 0, 0);
|
|
}
|
|
/* rearbitrate synchronous offset */
|
|
for (i = 0; i < ASC_NCMD; i++) {
|
|
asc->st[i].sync_offset = 0;
|
|
asc->st[i].flags = 0;
|
|
}
|
|
asc->target = -1;
|
|
return;
|
|
}
|
|
|
|
/* check for command errors */
|
|
if (ir & ASC_INT_ILL)
|
|
goto abort;
|
|
|
|
/* check for disconnect */
|
|
if (ir & ASC_INT_DISC) {
|
|
state = &asc->st[asc->target];
|
|
switch (ASC_SS(ss)) {
|
|
case 0: /* device did not respond */
|
|
/* check for one of the starting scripts */
|
|
switch (asc->script - asc_scripts) {
|
|
case SCRIPT_TRY_SYNC:
|
|
case SCRIPT_SIMPLE:
|
|
case SCRIPT_DATA_IN:
|
|
case SCRIPT_DATA_OUT:
|
|
if (regs->asc_flags & ASC_FLAGS_FIFO_CNT) {
|
|
regs->asc_cmd = ASC_CMD_FLUSH;
|
|
readback(regs->asc_cmd);
|
|
}
|
|
state->error = ENXIO;
|
|
asc_end(asc, status, ss, ir);
|
|
return;
|
|
}
|
|
/* FALLTHROUGH */
|
|
|
|
default:
|
|
printf("asc%d: SCSI device %d: unexpected disconnect\n",
|
|
asc - asc_softc, asc->target);
|
|
/*
|
|
* On rare occasions my RZ24 does a disconnect during
|
|
* data in phase and the following seems to keep it
|
|
* happy.
|
|
* XXX Should a scsi disk ever do this??
|
|
*/
|
|
asc->script = &asc_scripts[SCRIPT_RESEL];
|
|
asc->state = ASC_STATE_RESEL;
|
|
state->flags |= DISCONN;
|
|
regs->asc_cmd = ASC_CMD_ENABLE_SEL;
|
|
readback(regs->asc_cmd);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* check for reselect */
|
|
if (ir & ASC_INT_RESEL) {
|
|
unsigned fifo, id, msg;
|
|
|
|
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
|
|
if (fifo < 2)
|
|
goto abort;
|
|
/* read unencoded SCSI ID and convert to binary */
|
|
msg = regs->asc_fifo & asc->myidmask;
|
|
for (id = 0; (msg & 1) == 0; id++)
|
|
msg >>= 1;
|
|
/* read identify message */
|
|
msg = regs->asc_fifo;
|
|
#ifdef DEBUG
|
|
if (asc_logp == asc_log)
|
|
asc_log[NLOG - 1].msg = msg;
|
|
else
|
|
asc_logp[-1].msg = msg;
|
|
#endif
|
|
asc->state = ASC_STATE_BUSY;
|
|
asc->target = id;
|
|
state = &asc->st[id];
|
|
asc->script = state->script;
|
|
state->script = (script_t *)0;
|
|
if (!(state->flags & DISCONN))
|
|
goto abort;
|
|
state->flags &= ~DISCONN;
|
|
regs->asc_syn_p = state->sync_period;
|
|
regs->asc_syn_o = state->sync_offset;
|
|
regs->asc_cmd = ASC_CMD_MSG_ACPT;
|
|
readback(regs->asc_cmd);
|
|
goto done;
|
|
}
|
|
|
|
/* check if we are being selected as a target */
|
|
if (ir & (ASC_INT_SEL | ASC_INT_SEL_ATN))
|
|
goto abort;
|
|
|
|
/*
|
|
* 'ir' must be just ASC_INT_FC.
|
|
* This is normal if canceling an ASC_ENABLE_SEL.
|
|
*/
|
|
|
|
done:
|
|
MachEmptyWriteBuffer();
|
|
/* watch out for HW race conditions and setup & hold time violations */
|
|
ir = regs->asc_status;
|
|
while (ir != (status = regs->asc_status))
|
|
ir = status;
|
|
if (status & ASC_CSR_INT)
|
|
goto again;
|
|
return;
|
|
|
|
abort:
|
|
#ifdef DEBUG
|
|
asc_DumpLog("asc_intr");
|
|
#endif
|
|
#if 0
|
|
panic("asc_intr");
|
|
#else
|
|
for (;;);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* All the many little things that the interrupt
|
|
* routine might switch to.
|
|
*/
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
script_nop(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_get_status(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register int data;
|
|
|
|
/*
|
|
* Get the last two bytes in the FIFO.
|
|
*/
|
|
if ((data = regs->asc_flags & ASC_FLAGS_FIFO_CNT) != 2) {
|
|
printf("asc_get_status: fifo cnt %d\n", data); /* XXX */
|
|
asc_DumpLog("get_status"); /* XXX */
|
|
if (data < 2) {
|
|
asc->regs->asc_cmd = ASC_CMD_MSG_ACPT;
|
|
readback(asc->regs->asc_cmd);
|
|
return (0);
|
|
}
|
|
do {
|
|
data = regs->asc_fifo;
|
|
} while ((regs->asc_flags & ASC_FLAGS_FIFO_CNT) > 2);
|
|
}
|
|
|
|
/* save the status byte */
|
|
asc->st[asc->target].statusByte = data = regs->asc_fifo;
|
|
#ifdef DEBUG
|
|
if (asc_logp == asc_log)
|
|
asc_log[NLOG - 1].msg = data;
|
|
else
|
|
asc_logp[-1].msg = data;
|
|
#endif
|
|
|
|
/* get the (presumed) command_complete message */
|
|
if ((data = regs->asc_fifo) == SCSI_COMMAND_COMPLETE)
|
|
return (1);
|
|
|
|
#ifdef DEBUG
|
|
printf("asc_get_status: status %x cmd %x\n",
|
|
asc->st[asc->target].statusByte, data);
|
|
asc_DumpLog("asc_get_status");
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_end(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register ScsiCmd *scsicmd;
|
|
register State *state;
|
|
register int i, target;
|
|
|
|
asc->state = ASC_STATE_IDLE;
|
|
target = asc->target;
|
|
asc->target = -1;
|
|
scsicmd = asc->cmd[target];
|
|
asc->cmd[target] = (ScsiCmd *)0;
|
|
state = &asc->st[target];
|
|
|
|
#ifdef DEBUG
|
|
if (asc_debug > 1) {
|
|
printf("asc_end: %s target %d cmd %x err %d resid %d\n",
|
|
scsicmd->sd->sd_driver->d_name, target,
|
|
scsicmd->cmd[0], state->error, state->buflen);
|
|
}
|
|
#endif
|
|
#ifdef DIAGNOSTIC
|
|
if (target < 0 || !scsicmd)
|
|
panic("asc_end");
|
|
#endif
|
|
|
|
/* look for disconnected devices */
|
|
for (i = 0; i < ASC_NCMD; i++) {
|
|
if (!asc->cmd[i] || !(asc->st[i].flags & DISCONN))
|
|
continue;
|
|
asc->regs->asc_cmd = ASC_CMD_ENABLE_SEL;
|
|
readback(asc->regs->asc_cmd);
|
|
asc->state = ASC_STATE_RESEL;
|
|
asc->script = &asc_scripts[SCRIPT_RESEL];
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Look for another device that is ready.
|
|
* May want to keep last one started and increment for fairness
|
|
* rather than always starting at zero.
|
|
*/
|
|
for (i = 0; i < ASC_NCMD; i++) {
|
|
/* don't restart a disconnected command */
|
|
if (!asc->cmd[i] || (asc->st[i].flags & DISCONN))
|
|
continue;
|
|
asc_startcmd(asc, i);
|
|
break;
|
|
}
|
|
|
|
/* signal device driver that the command is done */
|
|
(*scsicmd->sd->sd_driver->d_done)(scsicmd->unit, state->error,
|
|
state->buflen, state->statusByte);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_dma_in(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
register int len;
|
|
|
|
/* check for previous chunk in buffer */
|
|
if (state->flags & DMA_IN_PROGRESS) {
|
|
/*
|
|
* Only count bytes that have been copied to memory.
|
|
* There may be some bytes in the FIFO if synchonous transfers
|
|
* are in progress.
|
|
*/
|
|
(*asc->dma_end)(asc, state, ASCDMA_READ);
|
|
ASC_TC_GET(regs, len);
|
|
len = state->dmalen - len;
|
|
bcopy(state->dmaBufAddr, state->buf, len);
|
|
state->buf += len;
|
|
state->buflen -= len;
|
|
}
|
|
|
|
/* setup to start reading the next chunk */
|
|
len = state->buflen;
|
|
if (len > state->dmaBufSize)
|
|
len = state->dmaBufSize;
|
|
state->dmalen = len;
|
|
(*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_READ);
|
|
ASC_TC_PUT(regs, len);
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_dma_in: buflen %d, len %d\n", state->buflen, len);
|
|
#endif
|
|
|
|
/* check for next chunk */
|
|
state->flags |= DMA_IN_PROGRESS;
|
|
if (len != state->buflen) {
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
|
|
readback(regs->asc_cmd);
|
|
asc->script = &asc_scripts[SCRIPT_CONTINUE_IN];
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_last_dma_in(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
register int len, fifo;
|
|
|
|
/* copy data from buffer to main memory */
|
|
(*asc->dma_end)(asc, state, ASCDMA_READ);
|
|
ASC_TC_GET(regs, len);
|
|
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_last_dma_in: buflen %d dmalen %d tc %d fifo %d\n",
|
|
state->buflen, state->dmalen, len, fifo);
|
|
#endif
|
|
if (fifo) {
|
|
/* device must be trying to send more than we expect */
|
|
regs->asc_cmd = ASC_CMD_FLUSH;
|
|
readback(regs->asc_cmd);
|
|
}
|
|
state->flags &= ~DMA_IN_PROGRESS;
|
|
len = state->dmalen - len;
|
|
state->buflen -= len;
|
|
bcopy(state->dmaBufAddr, state->buf, len);
|
|
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_resume_in(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
register int len;
|
|
|
|
/* setup to start reading the next chunk */
|
|
len = state->buflen;
|
|
if (len > state->dmaBufSize)
|
|
len = state->dmaBufSize;
|
|
state->dmalen = len;
|
|
(*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_READ);
|
|
ASC_TC_PUT(regs, len);
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_resume_in: buflen %d, len %d\n", state->buflen,
|
|
len);
|
|
#endif
|
|
|
|
/* check for next chunk */
|
|
state->flags |= DMA_IN_PROGRESS;
|
|
if (len != state->buflen) {
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
|
|
readback(regs->asc_cmd);
|
|
asc->script = &asc_scripts[SCRIPT_CONTINUE_IN];
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_resume_dma_in(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
register int len, off;
|
|
|
|
/* setup to finish reading the current chunk */
|
|
len = state->dmaresid;
|
|
off = state->dmalen - len;
|
|
if ((off & 1) && state->sync_offset) {
|
|
printf("asc_resume_dma_in: odd xfer dmalen %d len %d off %d\n",
|
|
state->dmalen, len, off); /* XXX */
|
|
regs->asc_res_fifo = state->dmaBufAddr[off];
|
|
}
|
|
(*asc->dma_start)(asc, state, state->dmaBufAddr + off, ASCDMA_READ);
|
|
ASC_TC_PUT(regs, len);
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_resume_dma_in: buflen %d dmalen %d len %d off %d\n",
|
|
state->dmalen, state->buflen, len, off);
|
|
#endif
|
|
|
|
/* check for next chunk */
|
|
state->flags |= DMA_IN_PROGRESS;
|
|
if (state->dmalen != state->buflen) {
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
|
|
readback(regs->asc_cmd);
|
|
asc->script = &asc_scripts[SCRIPT_CONTINUE_IN];
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_dma_out(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
register int len, fifo;
|
|
|
|
if (state->flags & DMA_IN_PROGRESS) {
|
|
/* check to be sure previous chunk was finished */
|
|
ASC_TC_GET(regs, len);
|
|
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
|
|
if (len || fifo)
|
|
printf("asc_dma_out: buflen %d dmalen %d tc %d fifo %d\n",
|
|
state->buflen, state->dmalen, len, fifo); /* XXX */
|
|
len += fifo;
|
|
len = state->dmalen - len;
|
|
state->buf += len;
|
|
state->buflen -= len;
|
|
}
|
|
|
|
/* setup for this chunk */
|
|
len = state->buflen;
|
|
if (len > state->dmaBufSize)
|
|
len = state->dmaBufSize;
|
|
state->dmalen = len;
|
|
bcopy(state->buf, state->dmaBufAddr, len);
|
|
(*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_WRITE);
|
|
ASC_TC_PUT(regs, len);
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_dma_out: buflen %d, len %d\n", state->buflen, len);
|
|
#endif
|
|
|
|
/* check for next chunk */
|
|
state->flags |= DMA_IN_PROGRESS;
|
|
if (len != state->buflen) {
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
|
|
readback(regs->asc_cmd);
|
|
asc->script = &asc_scripts[SCRIPT_CONTINUE_OUT];
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_last_dma_out(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
register int len, fifo;
|
|
|
|
ASC_TC_GET(regs, len);
|
|
fifo = regs->asc_flags & ASC_FLAGS_FIFO_CNT;
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_last_dma_out: buflen %d dmalen %d tc %d fifo %d\n",
|
|
state->buflen, state->dmalen, len, fifo);
|
|
#endif
|
|
if (fifo) {
|
|
len += fifo;
|
|
regs->asc_cmd = ASC_CMD_FLUSH;
|
|
readback(regs->asc_cmd);
|
|
printf("asc_last_dma_out: buflen %d dmalen %d tc %d fifo %d\n",
|
|
state->buflen, state->dmalen, len, fifo);
|
|
}
|
|
state->flags &= ~DMA_IN_PROGRESS;
|
|
len = state->dmalen - len;
|
|
state->buflen -= len;
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_resume_out(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
register int len;
|
|
|
|
/* setup for this chunk */
|
|
len = state->buflen;
|
|
if (len > state->dmaBufSize)
|
|
len = state->dmaBufSize;
|
|
state->dmalen = len;
|
|
bcopy(state->buf, state->dmaBufAddr, len);
|
|
(*asc->dma_start)(asc, state, state->dmaBufAddr, ASCDMA_WRITE);
|
|
ASC_TC_PUT(regs, len);
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_resume_out: buflen %d, len %d\n", state->buflen,
|
|
len);
|
|
#endif
|
|
|
|
/* check for next chunk */
|
|
state->flags |= DMA_IN_PROGRESS;
|
|
if (len != state->buflen) {
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
|
|
readback(regs->asc_cmd);
|
|
asc->script = &asc_scripts[SCRIPT_CONTINUE_OUT];
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_resume_dma_out(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
register int len, off;
|
|
|
|
/* setup to finish writing this chunk */
|
|
len = state->dmaresid;
|
|
off = state->dmalen - len;
|
|
if (off & 1) {
|
|
printf("asc_resume_dma_out: odd xfer dmalen %d len %d off %d\n",
|
|
state->dmalen, len, off); /* XXX */
|
|
regs->asc_fifo = state->dmaBufAddr[off];
|
|
off++;
|
|
len--;
|
|
}
|
|
(*asc->dma_start)(asc, state, state->dmaBufAddr + off, ASCDMA_WRITE);
|
|
ASC_TC_PUT(regs, len);
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_resume_dma_out: buflen %d dmalen %d len %d off %d\n",
|
|
state->dmalen, state->buflen, len, off);
|
|
#endif
|
|
|
|
/* check for next chunk */
|
|
state->flags |= DMA_IN_PROGRESS;
|
|
if (state->dmalen != state->buflen) {
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO | ASC_CMD_DMA;
|
|
readback(regs->asc_cmd);
|
|
asc->script = &asc_scripts[SCRIPT_CONTINUE_OUT];
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_sendsync(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
|
|
/* send the extended synchronous negotiation message */
|
|
regs->asc_fifo = SCSI_EXTENDED_MSG;
|
|
MachEmptyWriteBuffer();
|
|
regs->asc_fifo = 3;
|
|
MachEmptyWriteBuffer();
|
|
regs->asc_fifo = SCSI_SYNCHRONOUS_XFER;
|
|
MachEmptyWriteBuffer();
|
|
regs->asc_fifo = SCSI_MIN_PERIOD;
|
|
MachEmptyWriteBuffer();
|
|
regs->asc_fifo = ASC_MAX_OFFSET;
|
|
/* state to resume after we see the sync reply message */
|
|
state->script = asc->script + 2;
|
|
state->msglen = 0;
|
|
return (1);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_replysync(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_replysync: %x %x\n",
|
|
asc_to_scsi_period[state->sync_period] * asc->tb_ticks,
|
|
state->sync_offset);
|
|
#endif
|
|
/* send synchronous transfer in response to a request */
|
|
regs->asc_fifo = SCSI_EXTENDED_MSG;
|
|
MachEmptyWriteBuffer();
|
|
regs->asc_fifo = 3;
|
|
MachEmptyWriteBuffer();
|
|
regs->asc_fifo = SCSI_SYNCHRONOUS_XFER;
|
|
MachEmptyWriteBuffer();
|
|
regs->asc_fifo = asc_to_scsi_period[state->sync_period] * asc->tb_ticks;
|
|
MachEmptyWriteBuffer();
|
|
regs->asc_fifo = state->sync_offset;
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO;
|
|
readback(regs->asc_cmd);
|
|
|
|
/* return to the appropriate script */
|
|
if (!state->script) {
|
|
#ifdef DEBUG
|
|
asc_DumpLog("asc_replsync");
|
|
#endif
|
|
panic("asc_replysync");
|
|
}
|
|
asc->script = state->script;
|
|
state->script = (script_t *)0;
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_msg_in(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register asc_regmap_t *regs = asc->regs;
|
|
register State *state = &asc->st[asc->target];
|
|
register int msg;
|
|
int i;
|
|
|
|
/* read one message byte */
|
|
msg = regs->asc_fifo;
|
|
#ifdef DEBUG
|
|
if (asc_logp == asc_log)
|
|
asc_log[NLOG - 1].msg = msg;
|
|
else
|
|
asc_logp[-1].msg = msg;
|
|
#endif
|
|
|
|
/* check for multi-byte message */
|
|
if (state->msglen != 0) {
|
|
/* first byte is the message length */
|
|
if (state->msglen < 0) {
|
|
state->msglen = msg;
|
|
return (1);
|
|
}
|
|
if (state->msgcnt >= state->msglen)
|
|
goto abort;
|
|
state->msg_in[state->msgcnt++] = msg;
|
|
|
|
/* did we just read the last byte of the message? */
|
|
if (state->msgcnt != state->msglen)
|
|
return (1);
|
|
|
|
/* process an extended message */
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_msg_in: msg %x %x %x\n",
|
|
state->msg_in[0],
|
|
state->msg_in[1],
|
|
state->msg_in[2]);
|
|
#endif
|
|
switch (state->msg_in[0]) {
|
|
case SCSI_SYNCHRONOUS_XFER:
|
|
state->flags |= DID_SYNC;
|
|
state->sync_offset = state->msg_in[2];
|
|
|
|
/* convert SCSI period to ASC period */
|
|
i = state->msg_in[1] / asc->tb_ticks;
|
|
if (i < asc->min_period)
|
|
i = asc->min_period;
|
|
else if (i >= asc->max_period) {
|
|
/* can't do sync transfer, period too long */
|
|
printf("asc%d: SCSI device %d: sync xfer period too long (%d)\n",
|
|
asc - asc_softc, asc->target, i);
|
|
i = asc->max_period;
|
|
state->sync_offset = 0;
|
|
}
|
|
if ((i * asc->tb_ticks) != state->msg_in[1])
|
|
i++;
|
|
state->sync_period = i & 0x1F;
|
|
|
|
/*
|
|
* If this is a request, check minimums and
|
|
* send back an acknowledge.
|
|
*/
|
|
if (!(state->flags & TRY_SYNC)) {
|
|
regs->asc_cmd = ASC_CMD_SET_ATN;
|
|
readback(regs->asc_cmd);
|
|
|
|
if (state->sync_period < asc->min_period)
|
|
state->sync_period =
|
|
asc->min_period;
|
|
if (state->sync_offset > ASC_MAX_OFFSET)
|
|
state->sync_offset =
|
|
ASC_MAX_OFFSET;
|
|
asc->script = &asc_scripts[SCRIPT_REPLY_SYNC];
|
|
regs->asc_syn_p = state->sync_period;
|
|
readback(regs->asc_syn_p);
|
|
regs->asc_syn_o = state->sync_offset;
|
|
readback(regs->asc_syn_o);
|
|
regs->asc_cmd = ASC_CMD_MSG_ACPT;
|
|
readback(regs->asc_cmd);
|
|
return (0);
|
|
}
|
|
|
|
regs->asc_syn_p = state->sync_period;
|
|
readback(regs->asc_syn_p);
|
|
regs->asc_syn_o = state->sync_offset;
|
|
readback(regs->asc_syn_o);
|
|
goto done;
|
|
|
|
default:
|
|
printf("asc%d: SCSI device %d: rejecting extended message 0x%x\n",
|
|
asc - asc_softc, asc->target,
|
|
state->msg_in[0]);
|
|
goto reject;
|
|
}
|
|
}
|
|
|
|
/* process first byte of a message */
|
|
#ifdef DEBUG
|
|
if (asc_debug > 2)
|
|
printf("asc_msg_in: msg %x\n", msg);
|
|
#endif
|
|
switch (msg) {
|
|
#if 0
|
|
case SCSI_MESSAGE_REJECT:
|
|
printf(" did not like SYNCH xfer "); /* XXX */
|
|
state->flags |= DID_SYNC;
|
|
regs->asc_cmd = ASC_CMD_MSG_ACPT;
|
|
readback(regs->asc_cmd);
|
|
status = asc_wait(regs, ASC_CSR_INT);
|
|
ir = regs->asc_intr;
|
|
/* some just break out here, some dont */
|
|
if (ASC_PHASE(status) == ASC_PHASE_MSG_OUT) {
|
|
regs->asc_fifo = SCSI_ABORT;
|
|
regs->asc_cmd = ASC_CMD_XFER_INFO;
|
|
readback(regs->asc_cmd);
|
|
status = asc_wait(regs, ASC_CSR_INT);
|
|
ir = regs->asc_intr;
|
|
}
|
|
if (ir & ASC_INT_DISC) {
|
|
asc_end(asc, status, 0, ir);
|
|
return (0);
|
|
}
|
|
goto status;
|
|
#endif
|
|
|
|
case SCSI_EXTENDED_MSG: /* read an extended message */
|
|
/* setup to read message length next */
|
|
state->msglen = -1;
|
|
state->msgcnt = 0;
|
|
return (1);
|
|
|
|
case SCSI_NO_OP:
|
|
break;
|
|
|
|
case SCSI_SAVE_DATA_POINTER:
|
|
/* expect another message */
|
|
return (1);
|
|
|
|
case SCSI_RESTORE_POINTERS:
|
|
/*
|
|
* Need to do the following if resuming synchonous data in
|
|
* on an odd byte boundary.
|
|
regs->asc_cnfg2 |= ASC_CNFG2_RFB;
|
|
*/
|
|
break;
|
|
|
|
case SCSI_DISCONNECT:
|
|
if (state->flags & DISCONN)
|
|
goto abort;
|
|
state->flags |= DISCONN;
|
|
regs->asc_cmd = ASC_CMD_MSG_ACPT;
|
|
readback(regs->asc_cmd);
|
|
asc->script = &asc_scripts[SCRIPT_DISCONNECT];
|
|
return (0);
|
|
|
|
default:
|
|
printf("asc%d: SCSI device %d: rejecting message 0x%x\n",
|
|
asc - asc_softc, asc->target, msg);
|
|
reject:
|
|
/* request a message out before acknowledging this message */
|
|
state->msg_out = SCSI_MESSAGE_REJECT;
|
|
regs->asc_cmd = ASC_CMD_SET_ATN;
|
|
readback(regs->asc_cmd);
|
|
}
|
|
|
|
done:
|
|
/* return to original script */
|
|
regs->asc_cmd = ASC_CMD_MSG_ACPT;
|
|
readback(regs->asc_cmd);
|
|
if (!state->script) {
|
|
abort:
|
|
#ifdef DEBUG
|
|
asc_DumpLog("asc_msg_in");
|
|
#endif
|
|
panic("asc_msg_in");
|
|
}
|
|
asc->script = state->script;
|
|
state->script = (script_t *)0;
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
asc_disconnect(asc, status, ss, ir)
|
|
register asc_softc_t asc;
|
|
register int status, ss, ir;
|
|
{
|
|
register State *state = &asc->st[asc->target];
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (!(state->flags & DISCONN)) {
|
|
printf("asc_disconnect: device %d: DISCONN not set!\n",
|
|
asc->target);
|
|
}
|
|
#endif
|
|
asc->target = -1;
|
|
asc->state = ASC_STATE_RESEL;
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* DMA handling routines. For a turbochannel device, just set the dmar.
|
|
* For the I/O ASIC, handle the actual DMA interface.
|
|
*/
|
|
static void
|
|
tb_dma_start(asc, state, cp, flag)
|
|
asc_softc_t asc;
|
|
State *state;
|
|
caddr_t cp;
|
|
int flag;
|
|
{
|
|
|
|
if (flag == ASCDMA_WRITE)
|
|
*asc->dmar = ASC_DMAR_WRITE | ASC_DMA_ADDR(cp);
|
|
else
|
|
*asc->dmar = ASC_DMA_ADDR(cp);
|
|
}
|
|
|
|
static void
|
|
tb_dma_end(asc, state, flag)
|
|
asc_softc_t asc;
|
|
State *state;
|
|
int flag;
|
|
{
|
|
|
|
}
|
|
|
|
static void
|
|
asic_dma_start(asc, state, cp, flag)
|
|
asc_softc_t asc;
|
|
State *state;
|
|
caddr_t cp;
|
|
int flag;
|
|
{
|
|
register volatile u_int *ssr = (volatile u_int *)
|
|
ASIC_REG_CSR(asic_base);
|
|
u_int phys, nphys;
|
|
|
|
/* stop DMA engine first */
|
|
*ssr &= ~ASIC_CSR_DMAEN_SCSI;
|
|
*((volatile int *)ASIC_REG_SCSI_SCR(asic_base)) = 0;
|
|
|
|
phys = MACH_CACHED_TO_PHYS(cp);
|
|
cp = (caddr_t)pmax_trunc_page(cp + NBPG);
|
|
nphys = MACH_CACHED_TO_PHYS(cp);
|
|
|
|
asc->dma_next = cp;
|
|
asc->dma_xfer = state->dmalen - (nphys - phys);
|
|
|
|
*(volatile int *)ASIC_REG_SCSI_DMAPTR(asic_base) =
|
|
ASIC_DMA_ADDR(phys);
|
|
*(volatile int *)ASIC_REG_SCSI_DMANPTR(asic_base) =
|
|
ASIC_DMA_ADDR(nphys);
|
|
if (flag == ASCDMA_READ)
|
|
*ssr |= ASIC_CSR_SCSI_DIR | ASIC_CSR_DMAEN_SCSI;
|
|
else
|
|
*ssr = (*ssr & ~ASIC_CSR_SCSI_DIR) | ASIC_CSR_DMAEN_SCSI;
|
|
MachEmptyWriteBuffer();
|
|
}
|
|
|
|
static void
|
|
asic_dma_end(asc, state, flag)
|
|
asc_softc_t asc;
|
|
State *state;
|
|
int flag;
|
|
{
|
|
register volatile u_int *ssr = (volatile u_int *)
|
|
ASIC_REG_CSR(asic_base);
|
|
register volatile u_int *dmap = (volatile u_int *)
|
|
ASIC_REG_SCSI_DMAPTR(asic_base);
|
|
register u_short *to;
|
|
register int w;
|
|
int nb;
|
|
|
|
*ssr &= ~ASIC_CSR_DMAEN_SCSI;
|
|
to = (u_short *)MACH_PHYS_TO_CACHED(*dmap >> 3);
|
|
*dmap = -1;
|
|
*((volatile int *)ASIC_REG_SCSI_DMANPTR(asic_base)) = -1;
|
|
MachEmptyWriteBuffer();
|
|
|
|
if (flag == ASCDMA_READ) {
|
|
MachFlushDCache(MACH_PHYS_TO_CACHED(
|
|
MACH_UNCACHED_TO_PHYS(state->dmaBufAddr)), state->dmalen);
|
|
if (nb = *((int *)ASIC_REG_SCSI_SCR(asic_base))) {
|
|
/* pick up last upto6 bytes, sigh. */
|
|
|
|
/* Last byte really xferred is.. */
|
|
w = *(int *)ASIC_REG_SCSI_SDR0(asic_base);
|
|
*to++ = w;
|
|
if (--nb > 0) {
|
|
w >>= 16;
|
|
*to++ = w;
|
|
}
|
|
if (--nb > 0) {
|
|
w = *(int *)ASIC_REG_SCSI_SDR1(asic_base);
|
|
*to++ = w;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef notdef
|
|
/*
|
|
* Called by asic_intr() for scsi dma pointer update interrupts.
|
|
*/
|
|
void
|
|
asc_dma_intr()
|
|
{
|
|
asc_softc_t asc = &asc_softc[0];
|
|
u_int next_phys;
|
|
|
|
asc->dma_xfer -= NBPG;
|
|
if (asc->dma_xfer <= -NBPG) {
|
|
volatile u_int *ssr = (volatile u_int *)
|
|
ASIC_REG_CSR(asic_base);
|
|
*ssr &= ~ASIC_CSR_DMAEN_SCSI;
|
|
} else {
|
|
asc->dma_next += NBPG;
|
|
next_phys = MACH_CACHED_TO_PHYS(asc->dma_next);
|
|
}
|
|
*(volatile int *)ASIC_REG_SCSI_DMANPTR(asic_base) =
|
|
ASIC_DMA_ADDR(next_phys);
|
|
MachEmptyWriteBuffer();
|
|
}
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
asc_DumpLog(str)
|
|
char *str;
|
|
{
|
|
register struct asc_log *lp;
|
|
register u_int status;
|
|
|
|
printf("asc: %s: cmd %x bn %d cnt %d\n", str, asc_debug_cmd,
|
|
asc_debug_bn, asc_debug_sz);
|
|
lp = asc_logp;
|
|
do {
|
|
status = lp->status;
|
|
printf("asc%d tgt %d status %x ss %x ir %x cond %d:%x msg %x resid %d\n",
|
|
status >> 24,
|
|
lp->target,
|
|
(status >> 16) & 0xFF,
|
|
(status >> 8) & 0xFF,
|
|
status & 0XFF,
|
|
lp->state,
|
|
asc_scripts[lp->state].condition,
|
|
lp->msg, lp->resid);
|
|
if (++lp >= &asc_log[NLOG])
|
|
lp = asc_log;
|
|
} while (lp != asc_logp);
|
|
}
|
|
#endif
|
|
|
|
#endif /* NASC > 0 */
|