path: root/drivers/ide/ide-dma.c

/*
 *  linux/drivers/ide/ide-dma.c		Version 4.10	June 9, 2000
 *
 *  Copyright (c) 1999-2000	Andre Hedrick <andre@linux-ide.org>
 *  May be copied or modified under the terms of the GNU General Public License
 */

/*
 *  Special Thanks to Mark for his Six years of work.
 *
 *  Copyright (c) 1995-1998  Mark Lord
 *  May be copied or modified under the terms of the GNU General Public License
 */

/*
 * This module provides support for the bus-master IDE DMA functions
 * of various PCI chipsets, including the Intel PIIX (i82371FB for
 * the 430 FX chipset), the PIIX3 (i82371SB for the 430 HX/VX and 
 * 440 chipsets), and the PIIX4 (i82371AB for the 430 TX chipset)
 * ("PIIX" stands for "PCI ISA IDE Xcellerator").
 *
 * Pretty much the same code works for other IDE PCI bus-mastering chipsets.
 *
 * DMA is supported for all IDE devices (disk drives, cdroms, tapes, floppies).
 *
 * By default, DMA support is prepared for use, but is currently enabled only
 * for drives which already have DMA enabled (UltraDMA or mode 2 multi/single),
 * or which are recognized as "good" (see table below).  Drives with only mode0
 * or mode1 (multi/single) DMA should also work with this chipset/driver
 * (eg. MC2112A) but are not enabled by default.
 *
 * Use "hdparm -i" to view modes supported by a given drive.
 *
 * The hdparm-3.5 (or later) utility can be used for manually enabling/disabling
 * DMA support, but must be (re-)compiled against this kernel version or later.
 *
 * To enable DMA, use "hdparm -d1 /dev/hd?" on a per-drive basis after booting.
 * If problems arise, ide.c will disable DMA operation after a few retries.
 * This error recovery mechanism works and has been extremely well exercised.
 *
 * IDE drives, depending on their vintage, may support several different modes
 * of DMA operation.  The boot-time modes are indicated with a "*" in
 * the "hdparm -i" listing, and can be changed with *knowledgeable* use of
 * the "hdparm -X" feature.  There is seldom a need to do this, as drives
 * normally power-up with their "best" PIO/DMA modes enabled.
 *
 * Testing has been done with a rather extensive number of drives,
 * with Quantum & Western Digital models generally outperforming the pack,
 * and Fujitsu & Conner (and some Seagate which are really Conner) drives
 * showing more lackluster throughput.
 *
 * Keep an eye on /var/adm/messages for "DMA disabled" messages.
 *
 * Some people have reported trouble with Intel Zappa motherboards.
 * This can be fixed by upgrading the AMI BIOS to version 1.00.04.BS0,
 * available from ftp://ftp.intel.com/pub/bios/10004bs0.exe
 * (thanks to Glen Morrell <glen@spin.Stanford.edu> for researching this).
 *
 * Thanks to "Christopher J. Reimer" <reimer@doe.carleton.ca> for
 * fixing the problem with the BIOS on some Acer motherboards.
 *
 * Thanks to "Benoit Poulot-Cazajous" <poulot@chorus.fr> for testing
 * "TX" chipset compatibility and for providing patches for the "TX" chipset.
 *
 * Thanks to Christian Brunner <chb@muc.de> for taking a good first crack
 * at generic DMA -- his patches were referred to when preparing this code.
 *
 * Most importantly, thanks to Robert Bringman <rob@mars.trion.com>
 * for supplying a Promise UDMA board & WD UDMA drive for this work!
 *
 * And, yes, Intel Zappa boards really *do* use both PIIX IDE ports.
 *
 * ATA-66/100 and recovery functions, I forgot the rest......
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>

#include <asm/io.h>
#include <asm/irq.h>

static const struct drive_list_entry drive_whitelist [] = {

	{ "Micropolis 2112A"	,       "ALL"		},
	{ "CONNER CTMA 4000"	,       "ALL"		},
	{ "CONNER CTT8000-A"	,       "ALL"		},
	{ "ST34342A"		,	"ALL"		},
	{ NULL			,	NULL		}
};

static const struct drive_list_entry drive_blacklist [] = {

	{ "WDC AC11000H"	,	"ALL"		},
	{ "WDC AC22100H"	,	"ALL"		},
	{ "WDC AC32500H"	,	"ALL"		},
	{ "WDC AC33100H"	,	"ALL"		},
	{ "WDC AC31600H"	,	"ALL"		},
	{ "WDC AC32100H"	,	"24.09P07"	},
	{ "WDC AC23200L"	,	"21.10N21"	},
	{ "Compaq CRD-8241B"	,	"ALL"		},
	{ "CRD-8400B"		,	"ALL"		},
	{ "CRD-8480B",			"ALL"		},
	{ "CRD-8482B",			"ALL"		},
 	{ "CRD-84"		,	"ALL"		},
	{ "SanDisk SDP3B"	,	"ALL"		},
	{ "SanDisk SDP3B-64"	,	"ALL"		},
	{ "SANYO CD-ROM CRD"	,	"ALL"		},
	{ "HITACHI CDR-8"	,	"ALL"		},
	{ "HITACHI CDR-8335"	,	"ALL"		},
	{ "HITACHI CDR-8435"	,	"ALL"		},
	{ "Toshiba CD-ROM XM-6202B"	,	"ALL"		},
	{ "CD-532E-A"		,	"ALL"		},
	{ "E-IDE CD-ROM CR-840",	"ALL"		},
	{ "CD-ROM Drive/F5A",	"ALL"		},
	{ "WPI CDD-820",		"ALL"		},
	{ "SAMSUNG CD-ROM SC-148C",	"ALL"		},
	{ "SAMSUNG CD-ROM SC",	"ALL"		},
	{ "SanDisk SDP3B-64"	,	"ALL"		},
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",	"ALL"		},
	{ "_NEC DV5800A",               "ALL"           },  
	{ NULL			,	NULL		}

};

/**
 *	ide_in_drive_list	-	look for drive in black/white list
 *	@id: drive identifier
 *	@drive_table: list to inspect
 *
 *	Look for a drive in the blacklist and the whitelist tables
 *	Returns 1 if the drive is found in the table.
 */

int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
{
	for ( ; drive_table->id_model ; drive_table++)
		if ((!strcmp(drive_table->id_model, id->model)) &&
		    ((strstr(id->fw_rev, drive_table->id_firmware)) ||
		     (!strcmp(drive_table->id_firmware, "ALL"))))
			return 1;
	return 0;
}

/**
 *	ide_dma_intr	-	IDE DMA interrupt handler
 *	@drive: the drive the interrupt is for
 *
 *	Handle an interrupt completing a read/write DMA transfer on an 
 *	IDE device
 */
 
ide_startstop_t ide_dma_intr (ide_drive_t *drive)
{
	u8 stat = 0, dma_stat = 0;

	dma_stat = HWIF(drive)->ide_dma_end(drive);
	stat = HWIF(drive)->INB(IDE_STATUS_REG);	/* get drive status */
	if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) {
		if (!dma_stat) {
			struct request *rq = HWGROUP(drive)->rq;

			if (rq->rq_disk) {
				ide_driver_t *drv;

				drv = *(ide_driver_t **)rq->rq_disk->private_data;
				drv->end_request(drive, 1, <