1.\" $NetBSD: pciide.4,v 1.46 2002/11/25 22:50:49 bouyer Exp $ 2.\" 3.\" Copyright (c) 1998 Manuel Bouyer. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. All advertising materials mentioning features or use of this software 14.\" must display the following acknowledgement: 15.\" This product includes software developed by the University of 16.\" California, Berkeley and its contributors. 17.\" 4. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31.\" 32.Dd October 7, 2002 33.Dt PCIIDE 4 34.Os 35.Sh NAME 36.Nm pciide 37.Nd PCI IDE disk controllers driver 38.Sh SYNOPSIS 39.Cd "pciide* at pci? dev ? function ? flags 0x0000" 40.Cd "pciide* at pnpbios? index ?" 41.Cd "options PCIIDE_CMD064x_DISABLE" 42.Cd "options PCIIDE_AMD756_ENABLEDMA" 43.Cd "options PCIIDE_CMD0646U_ENABLEUDMA" 44.Sh DESCRIPTION 45The 46.Nm 47driver supports the PCI IDE controllers as specified in the 48"PCI IDE controller specification, revision 1.0" draft, and provides the core 49functions for the 50.Ic wd 51and 52.Ic atapi 53drivers. 54This driver include specific, enhanced support for the CMD Tech 55PCI0640 controller, and IDE DMA/Ultra-DMA support for the following 56controllers: 57.Bl -dash -compact -offset indent 58.It 59Acard ATP850 (Ultra/33) and ATP860 (Ultra/66) IDE Controllers 60.It 61Acer labs M5229 IDE Controller 62.It 63Advanced Micro Devices AMD-756, 766, and 768 IDE Controllers 64.It 65CMD Tech PCI0643, PCI0646, PCI0648, and PCI0649 IDE Controllers 66.It 67Contaq Microsystems/Cypress CY82C693 IDE Controller 68.It 69HighPoint HPT366 Ultra/66, HPT370 Ultra/100, HPT372, and HPT374 Ultra/133 70IDE controller 71.It 72Intel PIIX, PIIX3, and PIIX4 IDE Controllers 73.It 74Intel 82801 (ICH/ICH0/ICH2/ICH4) IDE Controllers 75.It 76OPTi 82c621 (plus a few of its derivatives) IDE Controllers 77.It 78Promise PDC20246 (Ultra/33), PDC20262 (Ultra/66), PDC20265/PDC20267 (Ultra100), 79PDC20268 (Ultra/100TX2 and Ultra/100TX2v2), Ultra/133, Ultra/133TX2 and 80Ultra/133TX2v2 PCI IDE controllers 81.It 82Silicon Image 0680 IDE controller 83.It 84Silicon Integrated System 5597/5598 IDE controller 85.It 86VIA Technologies VT82C586, VT82C586A, VT82C596A, VT82C686A, VT8233A, 87and VT8235 IDE Controllers 88.El 89Some of these controllers are only available in multifunction PCI chips. 90.Pp 91The 0x0001 flag forces the 92.Nm 93driver to use DMA when there is no explicit DMA mode setting support for 94the controller but DMA is present. 95If the BIOS didn't set up the controller 96properly, this can cause a machine hang. 97.Pp 98The 0x0002 flag forces the 99.Nm 100driver to disable DMA on chipsets for which DMA would normally be 101enabled. 102This can be used as a debugging aid, or to work around 103problems where the IDE controller is wired up to the system incorrectly. 104.Sh SEE ALSO 105.Xr intro 4 , 106.Xr pci 4 , 107.Xr pnpbios 4 , 108.Xr scsi 4 , 109.Xr wd 4 , 110.Xr wdc 4 111.Sh BUGS 112There's no way to reliably know if a PCI064x controller is enabled or not. 113If the driver finds a PCI064x, it will assume it is enabled unless the 114PCIIDE_CMD064x_DISABLE option is specified in the kernel config file. 115This will be a problem only if the controller has been disabled in the BIOS 116and another controller has been installed and uses the ISA legacy I/O ports 117and interrupts. 118.Pp 119The PCI0646U controller is known to be buggy with Ultra-DMA transfers, so 120Ultra-DMA is disabled by default for this controller. 121To enable Ultra-DMA, use the PCIIDE_CMD0646U_ENABLEUDMA option. 122Ultra-DMA can eventually be disabled on a per-drive basis with config 123flags, see 124.Xr wd 4 . 125.Pp 126The AMD756 chip revision D2 has a bug affecting DMA (but not Ultra-DMA) 127modes. 128The workaround documented by AMD is to not use DMA on any drive which 129does not support Ultra-DMA modes. 130This does not appear to be necessary on all drives, the 131PCIIDE_AMD756_ENABLEDMA option can be used to force multiword DMA 132on the buggy revisions. 133Multiword DMA can eventually be disabled on a 134per-drive basis with config flags, see 135.Xr wd 4 . 136The bug, if triggered, will cause a total system hang. 137.Pp 138The timings used for the PIO and DMA modes for controllers listed above 139are for a PCI bus running at 30 or 33 MHz (except the OPTi controller, 140which supports both 25 and 33 MHz PCI bus timings). 141This driver may not work properly on overclocked systems. 142