diff options
Diffstat (limited to 'drivers/ide/ide-dma.c')
-rw-r--r-- | drivers/ide/ide-dma.c | 52 |
1 files changed, 4 insertions, 48 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c index d0e7b537353e..2de99e4be5c9 100644 --- a/drivers/ide/ide-dma.c +++ b/drivers/ide/ide-dma.c | |||
@@ -1,9 +1,13 @@ | |||
1 | /* | 1 | /* |
2 | * IDE DMA support (including IDE PCI BM-DMA). | ||
3 | * | ||
2 | * Copyright (C) 1995-1998 Mark Lord | 4 | * Copyright (C) 1995-1998 Mark Lord |
3 | * Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org> | 5 | * Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org> |
4 | * Copyright (C) 2004, 2007 Bartlomiej Zolnierkiewicz | 6 | * Copyright (C) 2004, 2007 Bartlomiej Zolnierkiewicz |
5 | * | 7 | * |
6 | * May be copied or modified under the terms of the GNU General Public License | 8 | * May be copied or modified under the terms of the GNU General Public License |
9 | * | ||
10 | * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies). | ||
7 | */ | 11 | */ |
8 | 12 | ||
9 | /* | 13 | /* |
@@ -11,49 +15,6 @@ | |||
11 | */ | 15 | */ |
12 | 16 | ||
13 | /* | 17 | /* |
14 | * This module provides support for the bus-master IDE DMA functions | ||
15 | * of various PCI chipsets, including the Intel PIIX (i82371FB for | ||
16 | * the 430 FX chipset), the PIIX3 (i82371SB for the 430 HX/VX and | ||
17 | * 440 chipsets), and the PIIX4 (i82371AB for the 430 TX chipset) | ||
18 | * ("PIIX" stands for "PCI ISA IDE Xcellerator"). | ||
19 | * | ||
20 | * Pretty much the same code works for other IDE PCI bus-mastering chipsets. | ||
21 | * | ||
22 | * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies). | ||
23 | * | ||
24 | * By default, DMA support is prepared for use, but is currently enabled only | ||
25 | * for drives which already have DMA enabled (UltraDMA or mode 2 multi/single), | ||
26 | * or which are recognized as "good" (see table below). Drives with only mode0 | ||
27 | * or mode1 (multi/single) DMA should also work with this chipset/driver | ||
28 | * (eg. MC2112A) but are not enabled by default. | ||
29 | * | ||
30 | * Use "hdparm -i" to view modes supported by a given drive. | ||
31 | * | ||
32 | * The hdparm-3.5 (or later) utility can be used for manually enabling/disabling | ||
33 | * DMA support, but must be (re-)compiled against this kernel version or later. | ||
34 | * | ||
35 | * To enable DMA, use "hdparm -d1 /dev/hd?" on a per-drive basis after booting. | ||
36 | * If problems arise, ide.c will disable DMA operation after a few retries. | ||
37 | * This error recovery mechanism works and has been extremely well exercised. | ||
38 | * | ||
39 | * IDE drives, depending on their vintage, may support several different modes | ||
40 | * of DMA operation. The boot-time modes are indicated with a "*" in | ||
41 | * the "hdparm -i" listing, and can be changed with *knowledgeable* use of | ||
42 | * the "hdparm -X" feature. There is seldom a need to do this, as drives | ||
43 | * normally power-up with their "best" PIO/DMA modes enabled. | ||
44 | * | ||
45 | * Testing has been done with a rather extensive number of drives, | ||
46 | * with Quantum & Western Digital models generally outperforming the pack, | ||
47 | * and Fujitsu & Conner (and some Seagate which are really Conner) drives | ||
48 | * showing more lackluster throughput. | ||
49 | * | ||
50 | * Keep an eye on /var/adm/messages for "DMA disabled" messages. | ||
51 | * | ||
52 | * Some people have reported trouble with Intel Zappa motherboards. | ||
53 | * This can be fixed by upgrading the AMI BIOS to version 1.00.04.BS0, | ||
54 | * available from ftp://ftp.intel.com/pub/bios/10004bs0.exe | ||
55 | * (thanks to Glen Morrell <glen@spin.Stanford.edu> for researching this). | ||
56 | * | ||
57 | * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for | 18 | * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for |
58 | * fixing the problem with the BIOS on some Acer motherboards. | 19 | * fixing the problem with the BIOS on some Acer motherboards. |
59 | * | 20 | * |
@@ -65,11 +26,6 @@ | |||
65 | * | 26 | * |
66 | * Most importantly, thanks to Robert Bringman <rob@mars.trion.com> | 27 | * Most importantly, thanks to Robert Bringman <rob@mars.trion.com> |
67 | * for supplying a Promise UDMA board & WD UDMA drive for this work! | 28 | * for supplying a Promise UDMA board & WD UDMA drive for this work! |
68 | * | ||
69 | * And, yes, Intel Zappa boards really *do* use both PIIX IDE ports. | ||
70 | * | ||
71 | * ATA-66/100 and recovery functions, I forgot the rest...... | ||
72 | * | ||
73 | */ | 29 | */ |
74 | 30 | ||
75 | #include <linux/module.h> | 31 | #include <linux/module.h> |