4bc42357a9
MAXPHYS should be based on PAGE_SIZE rather than SYM_CONF_DMA_BOUNDARY. While at it, reuse the SYM_CONF_MAX_SG macro for specifying the maximum number of DMA tags so sym(4) itself doesn't size memory beyond what's required for handling MAXPHYS. PR: 168928 MFC after: 3 days
302 lines
8.9 KiB
C
302 lines
8.9 KiB
C
/*-
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* Device driver optimized for the Symbios/LSI 53C896/53C895A/53C1010
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* PCI-SCSI controllers.
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*
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* Copyright (C) 1999-2001 Gerard Roudier <groudier@free.fr>
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*
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* This driver also supports the following Symbios/LSI PCI-SCSI chips:
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* 53C810A, 53C825A, 53C860, 53C875, 53C876, 53C885, 53C895,
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* 53C810, 53C815, 53C825 and the 53C1510D is 53C8XX mode.
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*
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*
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* This driver for FreeBSD-CAM is derived from the Linux sym53c8xx driver.
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* Copyright (C) 1998-1999 Gerard Roudier
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*
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* The sym53c8xx driver is derived from the ncr53c8xx driver that had been
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* a port of the FreeBSD ncr driver to Linux-1.2.13.
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*
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* The original ncr driver has been written for 386bsd and FreeBSD by
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* Wolfgang Stanglmeier <wolf@cologne.de>
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* Stefan Esser <se@mi.Uni-Koeln.de>
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* Copyright (C) 1994 Wolfgang Stanglmeier
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*
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* The initialisation code, and part of the code that addresses
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* FreeBSD-CAM services is based on the aic7xxx driver for FreeBSD-CAM
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* written by Justin T. Gibbs.
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*
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* Other major contributions:
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*
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* NVRAM detection and reading.
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* Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
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*
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*-----------------------------------------------------------------------------
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* 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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/* $FreeBSD$ */
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#ifndef SYM_CONF_H
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#define SYM_CONF_H
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/*-------------------------------------------------------------------
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* Static configuration.
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*-------------------------------------------------------------------
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*/
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/*
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* Also support early NCR 810, 815 and 825 chips.
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*/
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#define SYM_CONF_GENERIC_SUPPORT
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/*
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* Use Normal IO instead of MMIO.
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*/
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/* #define SYM_CONF_IOMAPPED */
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/*
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* Max tags for a device (logical unit)
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* We use a power of 2, (7) means 2<<7=128
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* Maximum is 8 -> 256 tags
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*/
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#define SYM_CONF_MAX_TAG_ORDER (6)
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/*
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* DMA boundary
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* We need to ensure 16 MB boundaries not to be crossed during DMA of
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* each segment, due to some chips being flawed.
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*/
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#define SYM_CONF_DMA_BOUNDARY (1UL << 24)
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/*
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* Max number of scatter/gather entries for an I/O.
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* Each entry costs 8 bytes in the internal CCB data structure.
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* We use at most 33 segments but also no more than required for handling
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* MAXPHYS.
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*/
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#define SYM_CONF_MAX_SG (MIN(33, (MAXPHYS / PAGE_SIZE) + 1))
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/*
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* Max number of targets.
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* Maximum is 16 and you are advised not to change this value.
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*/
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#define SYM_CONF_MAX_TARGET (16)
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/*
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* Max number of logical units.
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* SPI-2 allows up to 64 logical units, but in real life, target
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* that implements more that 7 logical units are pretty rare.
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* Anyway, the cost of accepting up to 64 logical unit is low in
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* this driver, thus going with the maximum is acceptable.
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*/
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#define SYM_CONF_MAX_LUN (64)
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/*
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* Max number of IO control blocks queued to the controller.
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* Each entry needs 8 bytes and the queues are allocated contiguously.
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* Since we donnot want to allocate more than a page, the theorical
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* maximum is PAGE_SIZE/8. For safety, we announce a bit less to the
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* access method. :)
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* When not supplied, as it is suggested, the driver compute some
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* good value for this parameter.
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*/
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/* #define SYM_CONF_MAX_START (PAGE_SIZE/8 - 16) */
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/*
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* Support for NVRAM.
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*/
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#define SYM_CONF_NVRAM_SUPPORT
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/* #define SYM_CONF_NVRAM_SUPPORT */
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/*
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* Support for Immediate Arbitration.
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* Not advised.
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*/
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/* #define SYM_CONF_IARB_SUPPORT */
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/*-------------------------------------------------------------------
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* Configuration that could be dynamic if it was possible
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* to pass arguments to the driver.
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*-------------------------------------------------------------------
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*/
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/*
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* HOST default scsi id.
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*/
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#define SYM_SETUP_HOST_ID 7
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/*
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* Max synchronous transfers.
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*/
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#define SYM_SETUP_MIN_SYNC (9)
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/*
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* Max wide order.
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*/
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#define SYM_SETUP_MAX_WIDE (1)
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/*
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* Max SCSI offset.
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*/
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#define SYM_SETUP_MAX_OFFS (63)
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/*
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* Default number of tags.
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*/
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#define SYM_SETUP_MAX_TAG (1<<SYM_CONF_MAX_TAG_ORDER)
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/*
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* SYMBIOS NVRAM format support.
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*/
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#define SYM_SETUP_SYMBIOS_NVRAM (1)
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/*
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* TEKRAM NVRAM format support.
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*/
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#define SYM_SETUP_TEKRAM_NVRAM (1)
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/*
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* PCI parity checking.
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* It should not be an option, but some poor or broken
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* PCI-HOST bridges have been reported to make problems
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* when this feature is enabled.
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* Setting this option to 0 tells the driver not to
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* enable the checking against PCI parity.
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*/
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#ifndef SYM_SETUP_PCI_PARITY
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#define SYM_SETUP_PCI_PARITY (1)
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#endif
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/*
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* SCSI parity checking.
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*/
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#define SYM_SETUP_SCSI_PARITY (1)
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/*
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* SCSI activity LED.
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*/
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#define SYM_SETUP_SCSI_LED (0)
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/*
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* SCSI High Voltage Differential support.
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*
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* HVD/LVD/SE capable controllers (895, 895A, 896, 1010)
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* report the actual SCSI BUS mode from the STEST4 IO
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* register.
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*
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* But for HVD/SE only capable chips (825a, 875, 885),
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* the driver uses some heuristic to probe against HVD.
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* Normally, the chip senses the DIFFSENS signal and
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* should switch its BUS tranceivers to high impedance
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* in situation of the driver having been wrong about
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* the actual BUS mode. May-be, the BUS mode probing of
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* the driver is safe, but, given that it may be partially
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* based on some previous IO register settings, it
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* cannot be stated so. Thus, decision has been taken
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* to require a user option to be set for the DIFF probing
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* to be applied for the 825a, 875 and 885 chips.
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*
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* This setup option works as follows:
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*
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* 0 -> HVD only supported for 895, 895A, 896, 1010.
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* 1 -> HVD probed for 825A, 875, 885.
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* 2 -> HVD assumed for 825A, 875, 885 (not advised).
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*/
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#ifndef SYM_SETUP_SCSI_DIFF
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#define SYM_SETUP_SCSI_DIFF (0)
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#endif
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/*
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* IRQ mode.
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*/
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#define SYM_SETUP_IRQ_MODE (0)
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/*
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* Check SCSI BUS signal on reset.
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*/
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#define SYM_SETUP_SCSI_BUS_CHECK (1)
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/*
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* Max burst for PCI (1<<value)
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* 7 means: (1<<7) = 128 DWORDS.
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*/
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#define SYM_SETUP_BURST_ORDER (7)
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/*
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* Only relevant if IARB support configured.
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* - Max number of successive settings of IARB hints.
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* - Set IARB on arbitration lost.
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*/
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#define SYM_CONF_IARB_MAX 3
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#define SYM_CONF_SET_IARB_ON_ARB_LOST 1
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/*
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* Returning wrong residuals may make problems.
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* When zero, this define tells the driver to
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* always return 0 as transfer residual.
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* Btw, all my testings of residuals have succeeded.
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*/
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#define SYM_CONF_RESIDUAL_SUPPORT 1
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/*
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* Supported maximum number of LUNs to announce to
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* the access method.
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* The driver supports up to 64 LUNs per target as
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* required by SPI-2/SPI-3. However some SCSI devices
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* designed prior to these specifications or not being
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* conformant may be highly confused when they are
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* asked about a LUN > 7.
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*/
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#ifndef SYM_SETUP_MAX_LUN
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#define SYM_SETUP_MAX_LUN (8)
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#endif
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/*
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* Low priority probe map.
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*
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* This option is used as a bitmap to tell the driver
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* about chips that are to be claimed with a low priority
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* (-2000) by the probe method. This allows any other driver
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* that may return some higher priority value for the same
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* chips to take precedence over this driver (sym).
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* This option may be used when both the ncr driver and this
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* driver are configured.
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*
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* Bits are to be coded as follows:
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* 0x01 -> 810a, 860
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* 0x02 -> 825a, 875, 885, 895
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* 0x04 -> 895a, 896, 1510d
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* 0x08 -> 1010
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* 0x40 -> 810, 815, 825
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*
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* For example, value 5 tells the driver to claim support
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* for 810a, 860, 895a, 896 and 1510d with low priority,
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* allowing the ncr driver to take precedence if configured.
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*/
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#ifndef SYM_SETUP_LP_PROBE_MAP
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#define SYM_SETUP_LP_PROBE_MAP 0
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#endif
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#endif /* SYM_CONF_H */
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