1.\" $NetBSD: pciide.4,v 1.22 2000/07/07 09:53:28 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 15, 1998 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.Sh DESCRIPTION 44The 45.Nm pciide 46driver supports the PCI IDE controllers as specified in the 47"PCI IDE controller specification, revision 1.0" draft, and provides the core 48functions for the 49.Nm wd 50and 51.Nm atapi 52drivers. This driver include specific, enhanced support for the CMD Tech 53PCI0640 controller, and IDE DMA/Ultra-DMA support for the following 54controllers: 55.Bl -dash -compact -offset indent 56.It 57Acer labs M5229 IDE Controller 58.It 59Advanced Micro Devices AMD-756 IDE Controllers 60.It 61CMD Tech PCI0643, PCI0646, PCI0648 and PCI0649 IDE Controllers 62.It 63Contaq Microsystems/Cypress CY82C693 IDE Controller 64.It 65HighPoint HPT366 Ultra/66 IDE controller 66.It 67Intel PIIX, PIIX3 and PIIX4 IDE Controllers 68.It 69Intel 82801 (ICH/ICH0) IDE Controllers 70.It 71OPTi 82c621 (plus a few of its derivatives) IDE Controllers 72.It 73Promise PDC20246 (Ultra/33), PDC20262 (Ultra/66), and Ultra100 (in Ultra/66 74mode only) PCI IDE controllers 75.It 76Silicon Integrated System 5597/5598 IDE controller 77.It 78VIA Technologies VT82C586 and VT82C586A IDE Controllers 79.El 80Some of these controllers are only available in multifunction PCI chips. 81.Pp 82The 0x0001 flag forces the 83.Nm 84driver to use DMA when there is no explicit DMA mode setting support for 85the controller but DMA is present. If the BIOS didn't set up the controller 86properly, this can cause a machine hang. 87.Sh BUGS 88There's no way to reliably know if a PCI064x controller is enabled or not. 89If the driver finds a PCI064x, it will assume it is enabled unless the 90PCIIDE_CMD064x_DISABLE option is specified in the kernel config file. 91This will be a problem only if the controller has been disabled in the BIOS 92and another controller has been installed and uses the ISA legacy I/O ports 93and interrupts. 94.Pp 95The AMD756 chip revision D2 has a bug affecting DMA (but not Ultra-DMA) 96modes. The workaround documented by AMD is to not use DMA on any drive which 97does not support Ultra-DMA modes. This does not appear to be necessary on all 98drives, the PCIIDE_AMD756_ENABLEDMA option can be used to force multiword DMA 99on the buggy revisions. Multiword DMA eventually be disabled on a per-drive 100basis with config flags, see 101.Xr wd 4 . 102The bug, if triggered, will cause a total system hang. 103.Pp 104The timings used for the PIO and DMA modes for controllers listed above 105are for a PCI bus running at 30 or 33 Mhz (except the OPTi controller, 106which supports both 25 and 33 Mhz PCI bus timings). This driver may not 107work properly on overclocked systems. 108.Sh SEE ALSO 109.Xr intro 4 , 110.Xr pci 4 , 111.Xr pnpbios 4 , 112.Xr scsi 4 , 113.Xr wd 4 , 114.Xr wdc 4 115