| 1 | ====================================================================
|
|---|
| 2 | eComStation AHCI Driver
|
|---|
| 3 | ====================================================================
|
|---|
| 4 |
|
|---|
| 5 |
|
|---|
| 6 | Introduction
|
|---|
| 7 | ============
|
|---|
| 8 |
|
|---|
| 9 | OS2AHCI is an AHCI driver for eComStation. It supports both ATA and
|
|---|
| 10 | ATAPI devices in a single driver, thus there's no need for an
|
|---|
| 11 | ATAPI/CDROM filter driver.
|
|---|
| 12 |
|
|---|
| 13 |
|
|---|
| 14 | Copyrights
|
|---|
| 15 | ==========
|
|---|
| 16 |
|
|---|
| 17 | Copyright (c) 2011 thi.guten Software Development
|
|---|
| 18 | Copyright (c) 2011 Mensys B.V.
|
|---|
| 19 |
|
|---|
| 20 | Authors: Christian Mueller, Markus Thielen
|
|---|
| 21 |
|
|---|
| 22 | Parts copied from/inspired by the Linux AHCI driver;
|
|---|
| 23 | those parts are (c) Linux AHCI/ATA maintainers
|
|---|
| 24 |
|
|---|
| 25 | This program is free software; you can redistribute it and/or modify
|
|---|
| 26 | it under the terms of the GNU General Public License as published by
|
|---|
| 27 | the Free Software Foundation; either version 2 of the License, or
|
|---|
| 28 | (at your option) any later version.
|
|---|
| 29 |
|
|---|
| 30 | This program is distributed in the hope that it will be useful,
|
|---|
| 31 | but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 32 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 33 | GNU General Public License for more details.
|
|---|
| 34 |
|
|---|
| 35 | You should have received a copy of the GNU General Public License
|
|---|
| 36 | along with this program; if not, write to the Free Software
|
|---|
| 37 | Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|---|
| 38 | MA 02111-1307 USA
|
|---|
| 39 |
|
|---|
| 40 |
|
|---|
| 41 | Licensing and Source Code
|
|---|
| 42 | =========================
|
|---|
| 43 |
|
|---|
| 44 | The *binary* delivery of OS2AHCI.ADD as obtained from ecomstation.nl,
|
|---|
| 45 | or as part of packaged eComStation releases, is licensed to run with
|
|---|
| 46 | eComStation, only.
|
|---|
| 47 |
|
|---|
| 48 | The source code can be retrieved from http://svn.ecomstation.nl;
|
|---|
| 49 | in compliance to the GNU General Public License, the source code
|
|---|
| 50 | can of course be modified/compiled to run on other products as long
|
|---|
| 51 | as modifications will also be published as outlined in the GNU GPL2.
|
|---|
| 52 |
|
|---|
| 53 | The toolchain required for compilation consists of:
|
|---|
| 54 |
|
|---|
| 55 | - IBM OS/2 DDK version 9.23 or later (see ddk\base\h\version.mak)
|
|---|
| 56 | - Microsoft C600
|
|---|
| 57 | - ALP Assembler (part of DDK)
|
|---|
| 58 | - link.exe (part of DDK)
|
|---|
| 59 |
|
|---|
| 60 |
|
|---|
| 61 | Watcom Build
|
|---|
| 62 | ------------
|
|---|
| 63 |
|
|---|
| 64 | The source tree contains several files that were created during an
|
|---|
| 65 | attempt to use the Watcom compiler (e.g. wmakefile); however, the
|
|---|
| 66 | Watcom build is broken and produces a non-working driver.
|
|---|
| 67 |
|
|---|
| 68 |
|
|---|
| 69 | Installation
|
|---|
| 70 | ============
|
|---|
| 71 |
|
|---|
| 72 | - Copy the driver file, OS2AHCI.ADD, to C:\OS2\BOOT
|
|---|
| 73 |
|
|---|
| 74 | - Add the following line to CONFIG.SYS:
|
|---|
| 75 | BASEDEV=OS2AHCI.ADD
|
|---|
| 76 |
|
|---|
| 77 |
|
|---|
| 78 | Driver Command Line Options
|
|---|
| 79 | ===========================
|
|---|
| 80 |
|
|---|
| 81 | Global Options
|
|---|
| 82 |
|
|---|
| 83 | Option Description
|
|---|
| 84 | ------------------------------------------------------------------------------
|
|---|
| 85 | /c:<addr> Set debug COM port base address in hex (default = 3f8);
|
|---|
| 86 | if used, this option should come before any /d options.
|
|---|
| 87 | /d Debug output on COM port; multiple "/d" options will
|
|---|
| 88 | increase verbosity:
|
|---|
| 89 | 1 = requests
|
|---|
| 90 | 2 = detailed
|
|---|
| 91 | 3 = verbose, including MMIO operations
|
|---|
| 92 | /g:<vendor>:<device> Add generic PCI ID to list of supported AHCI adapters
|
|---|
| 93 | (e.g. /g:8086:2829)
|
|---|
| 94 | /t Perform thorough PCI ID scan; default = on, can be
|
|---|
| 95 | turned off with /!t to perform only a PCI class scan
|
|---|
| 96 | /r Reset ports during initialization (default = off
|
|---|
| 97 | unless the [Intel] AHCI controller was found to be
|
|---|
| 98 | initialized by the BIOS to SATA mode)
|
|---|
| 99 | /a Set adapter for adapter-specific options
|
|---|
| 100 | (default = -1, all adapters)
|
|---|
| 101 | /p Set port for port-specific options
|
|---|
| 102 | (default = -1, all ports)
|
|---|
| 103 |
|
|---|
| 104 | Adapter-specific Options
|
|---|
| 105 |
|
|---|
| 106 | Option Description
|
|---|
| 107 | ------------------------------------------------------------------------------
|
|---|
| 108 | /i Ignore current adapter
|
|---|
| 109 |
|
|---|
| 110 | Port-specific Options
|
|---|
| 111 |
|
|---|
| 112 | Option Description
|
|---|
| 113 | ------------------------------------------------------------------------------
|
|---|
| 114 | /s Enable SCSI emulation for ATAPI units (default = off)
|
|---|
| 115 | SCSI emulation is required for tools like cdrecord.
|
|---|
| 116 | /n Enable NCQ (Native Command Queuing) for hard disks
|
|---|
| 117 | (default = off)
|
|---|
| 118 | /ls Set link speed (default = 0):
|
|---|
| 119 | 0 = maximum,
|
|---|
| 120 | 1 = limit to generation 1
|
|---|
| 121 | 2 = limit to generation 2
|
|---|
| 122 | 3 = limit to generation 3
|
|---|
| 123 | /lp Set link power management (default = 0):
|
|---|
| 124 | 0 = full power management,
|
|---|
| 125 | 1 = transitions to "partial slumber state" disabled,
|
|---|
| 126 | 2 = transitions to "slumber state" disabled,
|
|---|
| 127 | 3 = transitions to both partial and slumber states
|
|---|
| 128 | disabled
|
|---|
| 129 | /4 Force track size to be 56 sectors regardless of the
|
|---|
| 130 | reported disk geometry to optimize partition boundaries
|
|---|
| 131 | for hard disks with 4096 byte sectors.
|
|---|
| 132 |
|
|---|
| 133 | Port-specific options depend on the currently active adapter
|
|---|
| 134 | and port selector (/a and /p). Those selectors are -1 per default
|
|---|
| 135 | which means "all" adapters/ports. The scope can be reduced by limiting
|
|---|
| 136 | it to an adapter (/a) or an adapter and a port (/a and /p). The scope
|
|---|
| 137 | can be reset by setting the corresponding option back to -1.
|
|---|
| 138 |
|
|---|
| 139 | For example:
|
|---|
| 140 |
|
|---|
| 141 | BASEDEV=OS2AHCI.ADD /n /a:0 /p:5 /!n /a:1 /p:-1 /!n
|
|---|
| 142 |
|
|---|
| 143 | This has the following effect:
|
|---|
| 144 |
|
|---|
| 145 | - Enable NCQ for all hard disks
|
|---|
| 146 | - Disable NCQ for hard disk on adapter #0, port #5
|
|---|
| 147 | - Disable NCQ for all hard disks on adapter #1
|
|---|
| 148 |
|
|---|
| 149 |
|
|---|
| 150 | Native Command Queuing
|
|---|
| 151 | ======================
|
|---|
| 152 |
|
|---|
| 153 | Native Command Queuing (NCQ) is a feature which allows sending multiple I/O
|
|---|
| 154 | requests to hard disks before waiting for any of the requests to complete,
|
|---|
| 155 | much like Tagged Command Queuing for SCSI devices. This allows the disks
|
|---|
| 156 | to reorder I/O requests to minimize head movements, resulting in improved
|
|---|
| 157 | performance when executing random I/Os. In practice, this will be most
|
|---|
| 158 | noticable when multiple programs request I/O services to different parts
|
|---|
| 159 | of the disk -- a single program typically won't queue up I/O's but instead
|
|---|
| 160 | will wait for each I/O to complete (with the exception of programs like
|
|---|
| 161 | database servers).
|
|---|
| 162 |
|
|---|
| 163 | While we believe NCQ will work with the majority of controllers and hard
|
|---|
| 164 | disks, it's currently turned off by default until we have more feedback
|
|---|
| 165 | from eComStation users. In order to turn on NCQ, just add the command line
|
|---|
| 166 | option "/n" to OS2AHCI.ADD.
|
|---|
| 167 |
|
|---|
| 168 |
|
|---|
| 169 | Interoperability With IDE Drivers
|
|---|
| 170 | =================================
|
|---|
| 171 |
|
|---|
| 172 | There are three kinds of IDE/ATA/SATA controllers:
|
|---|
| 173 |
|
|---|
| 174 | 1. Legacy controllers (IDE or SATA) without AHCI support
|
|---|
| 175 | This kind of controller will only be recognized by IDE drivers
|
|---|
| 176 | (IBM1S506.ADD or DANIS506.ADD).
|
|---|
| 177 |
|
|---|
| 178 | 2. AHCI-capable controllers which supports IDE/SATA legacy interfaces
|
|---|
| 179 | This kind of controller will work with IDE or AHCI drivers and it's
|
|---|
| 180 | up to the user to decide which driver to use.
|
|---|
| 181 |
|
|---|
| 182 | 3. AHCI-only controllers
|
|---|
| 183 | This kind of controller will only be recognized by OS2AHCI.
|
|---|
| 184 |
|
|---|
| 185 | If there's a mix of controllers of types 1 and 3, both an IDE and an AHCI
|
|---|
| 186 | driver will be required.
|
|---|
| 187 |
|
|---|
| 188 | If type 2 controllers are involved, it's up to the user to decide which
|
|---|
| 189 | driver to use. Both DANIS506.ADD and OS2AHCI.ADD will verify whether another
|
|---|
| 190 | driver has already allocated the corresponding adapter, thus the only
|
|---|
| 191 | decision to take for mixed configurations is whether type-2 controllers
|
|---|
| 192 | should be handled by DANIS506.ADD or OS2AHCI.ADD and this can be done by
|
|---|
| 193 | having the desired driver's BASEDEV statement coming first in CONFIG.SYS.
|
|---|
| 194 |
|
|---|
| 195 | NOTE: Older versions of DANIS506.ADD did not verify whether the resources
|
|---|
| 196 | of a particular adapter were already allocated by another driver.
|
|---|
| 197 | DANIS506.ADD 1.8.8 or later is required for this to work.
|
|---|
| 198 |
|
|---|
| 199 | When using earlier versions of DANI1S506.ADD, the options "/A:x /I"
|
|---|
| 200 | will be required to tell DANI1S506.ADD to ignore adapters to be
|
|---|
| 201 | driven by OS2AHCI.ADD. The same applies to IBM1S506.ADD
|
|---|
| 202 |
|
|---|
| 203 | Mixed Controller Example
|
|---|
| 204 | ------------------------
|
|---|
| 205 |
|
|---|
| 206 | Assume a DELL D630 or a Thinkpad T60. The hard disk is attached to the
|
|---|
| 207 | SATA/AHCI controller of the ICH-7 hub while the CDROM is attached to the
|
|---|
| 208 | legacy PATA IDE controller. This allows two different configurations:
|
|---|
| 209 |
|
|---|
| 210 | 1. Drive HDD and CDROM via DANIS506.ADD
|
|---|
| 211 | 2. Drive HDD via OS2AHCI.ADD and CDROM via DANI1S506.ADD
|
|---|
| 212 |
|
|---|
| 213 | OS2AHCI.ADD can't drive the CDROM because it's attached to a legacy PATA
|
|---|
| 214 | IDE controller which doesn't support AHCI.
|
|---|
| 215 |
|
|---|
| 216 | - If OS2AHCI.ADD comes first in CONFIG.SYS, it will take over the SATA/AHCI
|
|---|
| 217 | controller and drive the HDD. DANIS506.ADD will take care of the PATA/IDE
|
|---|
| 218 | controller for the CDROM.
|
|---|
| 219 | - If DANIS506.ADD comes first in CONFIG.SYS, it will take over both the
|
|---|
| 220 | SATA/AHCI and the PATA/IDE controller and OS2AHCI.ADD will silently exit.
|
|---|
| 221 |
|
|---|
| 222 | Advantages of AHCI
|
|---|
| 223 | ------------------
|
|---|
| 224 |
|
|---|
| 225 | The interfaces provided by the various [Intel] controllers could be
|
|---|
| 226 | summarized like this (the term ATA as driver interface being a bit of our
|
|---|
| 227 | own invention):
|
|---|
| 228 |
|
|---|
| 229 | - Intel PIIX: IDE (I/O registers) and ATA (taskfile)
|
|---|
| 230 | - Intel ICH6: IDE (I/O registers), ATA (taskfile) and SATA
|
|---|
| 231 | (FIS, vendor-specific)
|
|---|
| 232 | - Intel ICH7: IDE (I/O registers), ATA (taskfile), SATA
|
|---|
| 233 | (FIS, vendor-specific) and AHCI (FIS)
|
|---|
| 234 | - Intel PCH: AHCI (FIS)
|
|---|
| 235 |
|
|---|
| 236 | Taskfiles are regions in memory with ATA commands which the IDE/ATA
|
|---|
| 237 | controller can read and process autonomously. FIS (Frame Information
|
|---|
| 238 | Structures) are pretty much the same but they are specific to the SATA
|
|---|
| 239 | communication protocol on the serial link. The most important FIS type
|
|---|
| 240 | for AHCI drivers is the H2D (host to device) FIS which basically contains
|
|---|
| 241 | the ATA command to be executed.
|
|---|
| 242 |
|
|---|
| 243 | The big advantage of AHCI controllers, apart from being vendor-neutral,
|
|---|
| 244 | is that they take care of a lot of things which previous-generation
|
|---|
| 245 | drivers like DANI1S506 would have to do step by step. For example, in
|
|---|
| 246 | order to send an ATAPI command, DANIS506 would have to do the following:
|
|---|
| 247 |
|
|---|
| 248 | * Send ATA "PACKET" command to device (via IDE registers, ATA taskfiles
|
|---|
| 249 | or SATA FIS)
|
|---|
| 250 | * Wait until device signals via interrupt it's ready for the ATAPI command
|
|---|
| 251 | * Send ATAPI command to device via PIO
|
|---|
| 252 | * Wait until device signals via interrupt it's ready to transfer data
|
|---|
| 253 | * Send/Receive any data that might come along with the ATAPI command via
|
|---|
| 254 | PIO, or wait for DMA transfer to complete
|
|---|
| 255 | * Wait until device signals via interrupt that command and data transfer
|
|---|
| 256 | have completed
|
|---|
| 257 |
|
|---|
| 258 | For OS2AHCI, the same operation looks like this:
|
|---|
| 259 |
|
|---|
| 260 | * Fill in AHCI command header, FIS with ATA "PACKET" command and the ATAPI
|
|---|
| 261 | command
|
|---|
| 262 | * Tell port engine to process the command
|
|---|
| 263 | * Wait until controller signals via interrupt that command and data
|
|---|
| 264 | transfer have completed
|
|---|
| 265 |
|
|---|
| 266 | The AHCI controller automatically takes care of all underlying bits and
|
|---|
| 267 | pieces. OS2AHCI doesn't even have to know whether a particular message is
|
|---|
| 268 | sent via PIO or DMA because this is handled by the AHCI controller, too.
|
|---|
| 269 | And the whole concept of PIO and DMA is only relevant between AHCI controller
|
|---|
| 270 | and the device -- all transfers between OS2AHCI and the AHCI controller are
|
|---|
| 271 | always done via DMA.
|
|---|
| 272 |
|
|---|
