2 .\" Device driver optimized for the Symbios/LSI 53C896/53C895A/53C1010
3 .\" PCI SCSI controllers.
5 .\" Copyright (C) 1999-2000 Gerard Roudier <groudier@club-internet.fr>
7 .\" This driver also supports the following Symbios/LSI PCI SCSI chips:
8 .\" 53C810A, 53C825A, 53C860, 53C875, 53C876, 53C885, 53C895,
9 .\" 53C810, 53C815, 53C825 and the 53C1510D is 53C8XX mode.
12 .\" This driver for FreeBSD-CAM is derived from the Linux sym53c8xx driver.
13 .\" Copyright (C) 1998-1999 Gerard Roudier
15 .\" The sym53c8xx driver is derived from the ncr53c8xx driver that had been
16 .\" a port of the FreeBSD ncr driver to Linux-1.2.13.
18 .\" The original ncr driver has been written for 386bsd and FreeBSD by
19 .\" Wolfgang Stanglmeier <wolf@cologne.de>
20 .\" Stefan Esser <se@mi.Uni-Koeln.de>
21 .\" Copyright (C) 1994 Wolfgang Stanglmeier
23 .\" The initialization code, and part of the code that addresses
24 .\" FreeBSD-CAM services is based on the aic7xxx driver for FreeBSD-CAM
25 .\" written by Justin T. Gibbs.
27 .\" Other major contributions:
29 .\" NVRAM detection and reading.
30 .\" Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
32 .\" ----------------------------------------------------------------------------
34 .\" Redistribution and use in source and binary forms, with or without
35 .\" modification, are permitted provided that the following conditions
37 .\" 1. Redistributions of source code must retain the above copyright
38 .\" notice, this list of conditions and the following disclaimer.
39 .\" 2. Redistributions in binary form must reproduce the above copyright
40 .\" notice, this list of conditions and the following disclaimer in the
41 .\" documentation and/or other materials provided with the distribution.
42 .\" 3. The name of the author may not be used to endorse or promote products
43 .\" derived from this software without specific prior written permission.
45 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
46 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
49 .\" ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 .Nd NCR/Symbios/LSI Logic 53C8XX PCI SCSI host adapter driver
66 To compile this driver into the kernel,
67 place the following lines in your
68 kernel configuration file:
69 .Bd -ragged -offset indent
74 To disable PCI parity checking (needed for broken bridges):
75 .Cd "options SYM_SETUP_PCI_PARITY=<boolean>"
77 To control driver probing against HVD buses:
78 .Cd "options SYM_SETUP_SCSI_DIFF=<bit combination>"
80 Alternatively, to load the driver as a
81 module at boot time, place the following line in
83 .Bd -literal -offset indent
87 This driver provides support for the Symbios/LSI Logic 53C8XX
90 Driver features include support for wide SCSI busses and fast10, fast20,
91 fast40 and fast80-dt synchronous data transfers depending on controller
93 It also provides generic SCSI features such as tagged command
94 queueing and auto-request sense.
95 This driver is configured by default
96 for a maximum of 446 outstanding commands per bus, 8 LUNs per target
97 and 64 tagged tasks per LUN.
98 These numbers are not so much limited by design
99 as they are considered reasonable values for current SCSI technology.
100 These values can be increased by changing appropriate
101 constants in driver header files (not recommended).
103 This driver supports the entire Symbios 53C8XX family of PCI SCSI
105 It also offers the advantage of architectural improvements available
106 only with newer chips.
109 notably handles phase mismatch from SCRIPTS for the 53C896, 53C895A,
111 As a result, it guarantees that no more than 1 interrupt
112 per IO completion is delivered to the CPU, and that the SCRIPTS processor
113 is never stalled waiting for CPU attention in normal situations.
116 also uses LOAD/STORE SCRIPTS instructions for chips that support it.
117 Only the early 810, 815 and 825 NCR chips do not support LOAD/STORE.
118 Use of LOAD/STORE instead of MEMORY MOVE allows SCRIPTS to access IO
119 registers internal to the chip (no external PCI cycles).
120 As a result, the driver guarantees that no PCI self-mastering will occur
121 for chips that support LOAD/STORE.
123 LOAD/STORE instructions are also faster than MEMORY MOVE because
124 they do not involve the chip DMA FIFO and are coded on 2 DWORDs
127 For the early NCR 810, 815 and 825 chips, the driver uses a separate
128 SCRIPTS set that uses MEMORY MOVE instructions for data movements.
129 This is because LOAD/STORE are not supported by these chips.
131 HVD/LVD capable controllers (895, 895A, 896, and 897) report
132 the actual bus mode in the STEST4 chip IO registers.
134 allows the driver to safely probe against bus mode and to set up the chip
136 By default the driver only supports HVD for these chips.
137 For other chips that can support HVD but not LVD, the driver has to probe
138 implementation dependent registers (GPIO) in order to detect HVD bus mode.
139 Only HVD implementations that conform with Symbios Logic recommendations can
140 be detected by the driver.
142 .Ar SYM_SETUP_SCSI_DIFF
143 kernel option is assigned
144 a value of 1, the driver will also probe against HVD for 825a, 875, 876 and
145 885 chips, assuming Symbios Logic compatible implementation of HVD.
148 .Ar SYM_SETUP_PCI_PARITY
149 is assigned a value of 0, the
150 driver will not enable PCI parity checking for 53C8XX devices.
152 checking should not be an option for PCI SCSI controllers, but some
153 systems have been reported to fail using 53C8XX chips, due to spurious or
154 permanent PCI parity errors detected.
155 This option is supplied for
156 convenience but it is neither recommended nor supported.
158 This driver offers other options
159 that are not currently exported to the user.
160 They are defined and documented in the
163 Changing these options is not recommended unless absolutely necessary.
165 options are planned to be exported through
167 or an equivalent mechanism
168 in a future driver releases and therefore,
169 no compatibility is guaranteed.
171 At initialization, the driver tries to detect and read user settings from
173 The Symbios/Logic NVRAM layout and the Tekram NVRAM
174 layout are currently supported.
175 If the reading of the NVRAM succeeds, the
176 following settings are taken into account and reported to CAM:
177 .Bl -column "SCSI parity checking" "Symbios"
178 .It Em "Host settings Symbios Tekram"
179 .It "SCSI parity checking Y N"
180 .It "Host SCSI ident Y Y"
181 .It "Verbose messages Y N"
182 .It "Scan targets hi-lo Y N"
183 .It "Avoid SCSI bus reset Y N"
185 .Bl -column "Synchronous period" "Symbios"
186 .It Em "Device settings Symbios Tekram"
187 .It "Synchronous period Y Y"
188 .It "SCSI bus width Y Y"
189 .It "Queue tag enable Y Y"
190 .It "Number of tags NA Y"
191 .It "Disconnect enable Y Y"
192 .It "Scan at boot time Y N"
196 Devices that are configured as disabled for 'scan' in the NVRAM are not
197 reported to CAM at system start-up.
198 They can be discovered later using
200 .Ql camcontrol rescan
203 The table below summarizes the main features and capabilities of the
204 NCR/Symbios/LSI Logic 53C8XX family of PCI SCSI controllers.
205 .Bl -column sym53c1510d "80MHz" "Width" "SRAM" "PCI64"
206 .It Em "Chip Sync Width SRAM PCI64 Supported"
207 .It "sym53c810 10MHz 8Bit N N Y"
208 .It "sym53c810a 10MHz 8Bit N N Y"
209 .It "sym53c815 10MHz 8Bit N N Y"
210 .It "sym53c825 10MHz 16Bit N N Y"
211 .It "sym53c825a 10MHz 16Bit 4KB N Y"
212 .It "sym53c860 20MHz 8Bit N N Y"
213 .It "sym53c875 20MHz 16Bit 4KB N Y"
214 .It "sym53c876 20MHz 16Bit 4KB N Y"
215 .It "sym53c885 20MHz 16Bit 4KB N Y"
216 .It "sym53c895 40MHz 16Bit 4KB N Y"
217 .It "sym53c895A 40MHz 16Bit 8KB N Y"
218 .It "sym53c896 40MHz 16Bit 8KB Y Y"
219 .It "sym53c897 40MHz 16Bit 8KB Y Y"
220 .It "sym53c1510D 40MHz 16Bit 4KB Y Y"
221 .It "sym53c1010 80MHz 16Bit 8KB Y Y"
226 driver provides support for the following Symbios/LSI Logic PCI SCSI
266 The SCSI controllers supported by
268 can be either embedded on a motherboard, or on
269 one of the following add-on boards:
275 Data Technology DTC3130 (all variants)
279 Diamond FirePort (all)
285 Tekram DC390W, 390U, 390F, 390U2B, 390U2W, 390U3D, and 390U3W
290 The DEC KZPCA-AA is a rebadged SYM8952U.
306 driver was written by
308 and is derived from the
309 Linux sym53c8xx driver from the same author.
310 The sym53c8xx driver is derived from the ncr53c8xx driver,
311 which was ported from the
314 driver to Linux-1.2.13.
317 driver was written for
322 .An Wolfgang Stanglmeier