FreeBSD/Linux Kernel Cross Reference
sys/dev/sym/sym_conf.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      *  Device driver optimized for the Symbios/LSI 53C896/53C895A/53C1010 
      *  PCI-SCSI controllers.
      *
      *  Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
      *
      *  This driver also supports the following Symbios/LSI PCI-SCSI chips:
     *      53C810A, 53C825A, 53C860, 53C875, 53C876, 53C885, 53C895,
     *      53C810,  53C815,  53C825 and the 53C1510D is 53C8XX mode.
     *
     *  
     *  This driver for FreeBSD-CAM is derived from the Linux sym53c8xx driver.
     *  Copyright (C) 1998-1999  Gerard Roudier
     *
     *  The sym53c8xx driver is derived from the ncr53c8xx driver that had been 
     *  a port of the FreeBSD ncr driver to Linux-1.2.13.
     *
     *  The original ncr driver has been written for 386bsd and FreeBSD by
     *          Wolfgang Stanglmeier        <wolf@cologne.de>
     *          Stefan Esser                <se@mi.Uni-Koeln.de>
     *  Copyright (C) 1994  Wolfgang Stanglmeier
     *
     *  The initialisation code, and part of the code that addresses 
     *  FreeBSD-CAM services is based on the aic7xxx driver for FreeBSD-CAM 
     *  written by Justin T. Gibbs.
     *
     *  Other major contributions:
     *
     *  NVRAM detection and reading.
     *  Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
     *
     *-----------------------------------------------------------------------------
     *
     * 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. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHOR 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.
     */
    
    /* $FreeBSD$ */
    
    #ifndef SYM_CONF_H
    #define SYM_CONF_H
    
    /*-------------------------------------------------------------------
     *  Static configuration.
     *-------------------------------------------------------------------
     */
    
    /*
     *  Also support early NCR 810, 815 and 825 chips.
     */
    #define SYM_CONF_GENERIC_SUPPORT
    
    /*
     *  Use Normal IO instead of MMIO.
     */
    /* #define SYM_CONF_IOMAPPED */
    
    /*
     *  Max tags for a device (logical unit)
     *      We use a power of 2, (7) means 2<<7=128
     *  Maximum is 8 -> 256 tags
     */
    #define SYM_CONF_MAX_TAG_ORDER  (6)
    
    /*
     *  DMA boundary
     *  We need to ensure 16 MB boundaries not to be crossed during DMA of
     *  each segment, due to some chips being flawed.
     */
    #define SYM_CONF_DMA_BOUNDARY   (1UL << 24)
    
    /*
     *  Max number of scatter/gather entries for an I/O.
     *  Each entry costs 8 bytes in the internal CCB data structure.
     *  We use at most 33 segments but also no more than required for handling
     *  legacy MAXPHYS == 128 * 1024.
     */
   #define SYM_CONF_MAX_SG         (MIN(33, (128 * 1024 / PAGE_SIZE) + 1))
   
   /*
    *  Max number of targets.
    *  Maximum is 16 and you are advised not to change this value.
    */
   #define SYM_CONF_MAX_TARGET     (16)
   
   /*
    *  Max number of logical units.
    *  SPI-2 allows up to 64 logical units, but in real life, target
    *  that implements more that 7 logical units are pretty rare.
    *  Anyway, the cost of accepting up to 64 logical unit is low in 
    *  this driver, thus going with the maximum is acceptable.
    */
   #define SYM_CONF_MAX_LUN                (64)
   
   /*
    *  Max number of IO control blocks queued to the controller.
    *  Each entry needs 8 bytes and the queues are allocated contiguously.
    *  Since we donnot want to allocate more than a page, the theorical 
    *  maximum is PAGE_SIZE/8. For safety, we announce a bit less to the 
    *  access method. :)
    *  When not supplied, as it is suggested, the driver compute some 
    *  good value for this parameter.
    */
   /* #define SYM_CONF_MAX_START   (PAGE_SIZE/8 - 16) */
   
   /*
    *  Support for NVRAM.
    */
   #define SYM_CONF_NVRAM_SUPPORT
   /* #define SYM_CONF_NVRAM_SUPPORT */
   
   /*
    *  Support for Immediate Arbitration.
    *  Not advised.
    */
   /* #define SYM_CONF_IARB_SUPPORT */
   
   /*-------------------------------------------------------------------
    *  Configuration that could be dynamic if it was possible 
    *  to pass arguments to the driver.
    *-------------------------------------------------------------------
    */
   
   /*
    *  HOST default scsi id.
    */
   #define SYM_SETUP_HOST_ID       7
   
   /*
    *  Max synchronous transfers.
    */
   #define SYM_SETUP_MIN_SYNC      (9)
   
   /*
    *  Max wide order.
    */
   #define SYM_SETUP_MAX_WIDE      (1)
   
   /*
    *  Max SCSI offset.
    */
   #define SYM_SETUP_MAX_OFFS      (63)
   
   /*
    *  Default number of tags.
    */
   #define SYM_SETUP_MAX_TAG       (1<<SYM_CONF_MAX_TAG_ORDER)
   
   /*
    *  SYMBIOS NVRAM format support.
    */
   #define SYM_SETUP_SYMBIOS_NVRAM (1)
   
   /*
    *  TEKRAM NVRAM format support.
    */
   #define SYM_SETUP_TEKRAM_NVRAM  (1)
   
   /*
    *  PCI parity checking.
    *  It should not be an option, but some poor or broken 
    *  PCI-HOST bridges have been reported to make problems 
    *  when this feature is enabled.
    *  Setting this option to 0 tells the driver not to 
    *  enable the checking against PCI parity.
    */
   #ifndef SYM_SETUP_PCI_PARITY
   #define SYM_SETUP_PCI_PARITY    (1)
   #endif
   
   /*
    *  SCSI parity checking.
    */
   #define SYM_SETUP_SCSI_PARITY   (1)
   
   /*
    *  SCSI activity LED.
    */
   #define SYM_SETUP_SCSI_LED      (0)
   
   /*
    *  SCSI High Voltage Differential support.
    *
    *  HVD/LVD/SE capable controllers (895, 895A, 896, 1010) 
    *  report the actual SCSI BUS mode from the STEST4 IO 
    *  register.
    *
    *  But for HVD/SE only capable chips (825a, 875, 885), 
    *  the driver uses some heuristic to probe against HVD. 
    *  Normally, the chip senses the DIFFSENS signal and 
    *  should switch its BUS tranceivers to high impedance 
    *  in situation of the driver having been wrong about 
    *  the actual BUS mode. May-be, the BUS mode probing of 
    *  the driver is safe, but, given that it may be partially 
    *  based on some previous IO register settings, it 
    *  cannot be stated so. Thus, decision has been taken 
    *  to require a user option to be set for the DIFF probing 
    *  to be applied for the 825a, 875 and 885 chips.
    *  
    *  This setup option works as follows:
    *
    *    0  ->  HVD only supported for 895, 895A, 896, 1010.
    *    1  ->  HVD probed  for 825A, 875, 885.
    *    2  ->  HVD assumed for 825A, 875, 885 (not advised).
    */
   #ifndef SYM_SETUP_SCSI_DIFF
   #define SYM_SETUP_SCSI_DIFF     (0)
   #endif
   
   /*
    *  IRQ mode.
    */
   #define SYM_SETUP_IRQ_MODE      (0)
   
   /*
    *  Check SCSI BUS signal on reset.
    */
   #define SYM_SETUP_SCSI_BUS_CHECK        (1)
   
   /*
    *  Max burst for PCI (1<<value)
    *  7 means: (1<<7) = 128 DWORDS.
    */
   #define SYM_SETUP_BURST_ORDER   (7)
   
   /*
    *  Only relevant if IARB support configured.
    *  - Max number of successive settings of IARB hints.
    *  - Set IARB on arbitration lost.
    */
   #define SYM_CONF_IARB_MAX 3
   #define SYM_CONF_SET_IARB_ON_ARB_LOST 1
   
   /*
    *  Returning wrong residuals may make problems.
    *  When zero, this define tells the driver to 
    *  always return 0 as transfer residual.
    *  Btw, all my testings of residuals have succeeded.
    */
   #define SYM_CONF_RESIDUAL_SUPPORT 1
   
   /*
    *  Supported maximum number of LUNs to announce to 
    *  the access method.
    *  The driver supports up to 64 LUNs per target as 
    *  required by SPI-2/SPI-3. However some SCSI devices  
    *  designed prior to these specifications or not being  
    *  conformant may be highly confused when they are 
    *  asked about a LUN > 7.
    */
   #ifndef SYM_SETUP_MAX_LUN
   #define SYM_SETUP_MAX_LUN       (8)
   #endif
   
   #endif /* SYM_CONF_H */

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