drivers/ide/pci/alim15x3.c

/*
 * linux/drivers/ide/pci/alim15x3.c		Version 0.25	Jun 9 2007
 *
 *  Copyright (C) 1998-2000 Michel Aubry, Maintainer
 *  Copyright (C) 1998-2000 Andrzej Krzysztofowicz, Maintainer
 *  Copyright (C) 1999-2000 CJ, cjtsai@ali.com.tw, Maintainer
 *
 *  Copyright (C) 1998-2000 Andre Hedrick (andre@linux-ide.org)
 *  May be copied or modified under the terms of the GNU General Public License
 *  Copyright (C) 2002 Alan Cox <alan@redhat.com>
 *  ALi (now ULi M5228) support by Clear Zhang <Clear.Zhang@ali.com.tw>
 *  Copyright (C) 2007 MontaVista Software, Inc. <source@mvista.com>
 *  Copyright (C) 2007 Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
 *
 *  (U)DMA capable version of ali 1533/1543(C), 1535(D)
 *
 **********************************************************************
 *  9/7/99 --Parts from the above author are included and need to be
 *  converted into standard interface, once I finish the thought.
 *
 *  Recent changes
 *	Don't use LBA48 mode on ALi <= 0xC4
 *	Don't poke 0x79 with a non ALi northbridge
 *	Don't flip undefined bits on newer chipsets (fix Fujitsu laptop hang)
 *	Allow UDMA6 on revisions > 0xC4
 *
 *  Documentation
 *	Chipset documentation available under NDA only
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <linux/dmi.h>

#include <asm/io.h>

#define DISPLAY_ALI_TIMINGS

/*
 *	ALi devices are not plug in. Otherwise these static values would
 *	need to go. They ought to go away anyway
 */
 
static u8 m5229_revision;
static u8 chip_is_1543c_e;
static struct pci_dev *isa_dev;

#if defined(DISPLAY_ALI_TIMINGS) && defined(CONFIG_IDE_PROC_FS)
#include <linux/stat.h>
#include <linux/proc_fs.h>

static u8 ali_proc = 0;

static struct pci_dev *bmide_dev;

static char *fifo[4] = {
	"FIFO Off",
	"FIFO On ",
	"DMA mode",
	"PIO mode" };

static char *udmaT[8] = {
	"1.5T",
	"  2T",
	"2.5T",
	"  3T",
	"3.5T",
	"  4T",
	"  6T",
	"  8T"
};

static char *channel_status[8] = {
	"OK            ",
	"busy          ",
	"DRQ           ",
	"DRQ busy      ",
	"error         ",
	"error busy    ",
	"error DRQ     ",
	"error DRQ busy"
};

/**
 *	ali_get_info		-	generate proc file for ALi IDE
 *	@buffer: buffer to fill
 *	@addr: address of user start in buffer
 *	@offset: offset into 'file'
 *	@count: buffer count
 *
 *	Walks the Ali devices and outputs summary data on the tuning and
 *	anything else that will help with debugging
 */
 
static int ali_get_info (char *buffer, char **addr, off_t offset, int count)
{
	unsigned long bibma;
	u8 reg53h, reg5xh, reg5yh, reg5xh1, reg5yh1, c0, c1, rev, tmp;
	char *q, *p = buffer;

	/* fetch rev. */
	pci_read_config_byte(bmide_dev, 0x08, &rev);
	if (rev >= 0xc1)	/* M1543C or newer */
		udmaT[7] = " ???";
	else
		fifo[3]  = "   ???  ";

	/* first fetch bibma: */
	
	bibma = pci_resource_start(bmide_dev, 4);

	/*
	 * at that point bibma+0x2 et bibma+0xa are byte
	 * registers to investigate:
	 */
	c0 = inb(bibma + 0x02);
	c1 = inb(bibma + 0x0a);

	p += sprintf(p,
		"\n                                Ali M15x3 Chipset.\n");
	p += sprintf(p,
		"                                ------------------\n");
	pci_read_config_byte(bmide_dev, 0x78, &reg53h);
	p += sprintf(p, "PCI Clock: %d.\n", reg53h);

	pci_read_config_byte(bmide_dev, 0x53, &reg53h);
	p += sprintf(p,
		"CD_ROM FIFO:%s, CD_ROM DMA:%s\n",
		(reg53h & 0x02) ? "Yes" : "No ",
		(reg53h & 0x01) ? "Yes" : "No " );
	pci_read_config_byte(bmide_dev, 0x74, &reg53h);
	p += sprintf(p,
		"FIFO Status: contains %d Words, runs%s%s\n\n",
		(reg53h & 0x3f),
		(reg53h & 0x40) ? " OVERWR" : "",
		(reg53h & 0x80) ? " OVERRD." : "." );

	p += sprintf(p,
		"-------------------primary channel"
		"-------------------secondary channel"
		"---------\n\n");

	pci_read_config_byte(bmide_dev, 0x09, &reg53h);
	p += sprintf(p,
		"channel status:       %s"
		"                               %s\n",
		(reg53h & 0x20) ? "On " : "Off",
		(reg53h & 0x10) ? "On " : "Off" );

	p += sprintf(p,
		"both channels togth:  %s"
		"                               %s\n",
		(c0&0x80) ? "No " : "Yes",
		(c1&0x80) ? "No " : "Yes" );

	pci_read_config_byte(bmide_dev, 0x76, &reg53h);
	p += sprintf(p,
		"Channel state:        %s                    %s\n",
		channel_status[reg53h & 0x07],
		channel_status[(reg53h & 0x70) >> 4] );

	pci_read_config_byte(bmide_dev, 0x58, &reg5xh);
	pci_read_config_byte(bmide_dev, 0x5c, &reg5yh);
	p += sprintf(p,
		"Add. Setup Timing:    %dT"
		"                                %dT\n",
		(reg5xh & 0x07) ? (reg5xh & 0x07) : 8,
		(reg5yh & 0x07) ? (reg5yh & 0x07) : 8 );

	pci_read_config_byte(bmide_dev, 0x59, &reg5xh);
	pci_read_config_byte(bmide_dev, 0x5d, &reg5yh);
	p += sprintf(p,
		"Command Act. Count:   %dT"
		"                                %dT\n"
		"Command Rec. Count:   %dT"
		"                               %dT\n\n",
		(reg5xh & 0x70) ? ((reg5xh & 0x70) >> 4) : 8,
		(reg5yh & 0x70) ? ((reg5yh & 0x70) >> 4) : 8, 
		(reg5xh & 0x0f) ? (reg5xh & 0x0f) : 16,
		(reg5yh & 0x0f) ? (reg5yh & 0x0f) : 16 );

	p += sprintf(p,
		"----------------drive0-----------drive1"
		"------------drive0-----------drive1------\n\n");
	p += sprintf(p,
		"DMA enabled:      %s              %s"
		"               %s              %s\n",
		(c0&0x20) ? "Yes" : "No ",
		(c0&0x40) ? "Yes" : "No ",
		(c1&0x20) ? "Yes" : "No ",
		(c1&0x40) ? "Yes" : "No " );

	pci_read_config_byte(bmide_dev, 0x54, &reg5xh);
	pci_read_config_byte(bmide_dev, 0x55, &reg5yh);
	q = "FIFO threshold:   %2d Words         %2d Words"
		"          %2d Words         %2d Words\n";
	if (rev < 0xc1) {
		if ((rev == 0x20) &&
		    (pci_read_config_byte(bmide_dev, 0x4f, &tmp), (tmp &= 0x20))) {
			p += sprintf(p, q, 8, 8, 8, 8);
		} else {
			p += sprintf(p, q,
				(reg5xh & 0x03) + 12,
				((reg5xh & 0x30)>>4) + 12,
				(reg5yh & 0x03) + 12,
				((reg5yh & 0x30)>>4) + 12 );
		}
	} else {
		int t1 = (tmp = (reg5xh & 0x03)) ? (tmp << 3) : 4;
		int t2 = (tmp = ((reg5xh & 0x30)>>4)) ? (tmp << 3) : 4;
		int t3 = (tmp = (reg5yh & 0x03)) ? (tmp << 3) : 4;
		int t4 = (tmp = ((reg5yh & 0x30)>>4)) ? (tmp << 3) : 4;
		p += sprintf(p, q, t1, t2, t3, t4);
	}

#if 0
	p += sprintf(p, 
		"FIFO threshold:   %2d Words         %2d Words"
		"          %2d Words         %2d Words\n",
		(reg5xh & 0x03) + 12,
		((reg5xh & 0x30)>>4) + 12,
		(reg5yh & 0x03) + 12,
		((reg5yh & 0x30)>>4) + 12 );
#endif

	p += sprintf(p,
		"FIFO mode:        %s         %s          %s         %s\n",
		fifo[((reg5xh & 0x0c) >> 2)],
		fifo[((reg5xh & 0xc0) >> 6)],
		fifo[((reg5yh & 0x0c) >> 2)],
		fifo[((reg5yh & 0xc0) >> 6)] );

	pci_read_config_byte(bmide_dev, 0x5a, &reg5xh);
	pci_read_config_byte(bmide_dev, 0x5b, &reg5xh1);
	pci_read_config_byte(bmide_dev, 0x5e, &reg5yh);
	pci_read_config_byte(bmide_dev, 0x5f, &reg5yh1);

	p += sprintf(p,/*
		"------------------drive0-----------drive1"
		"------------drive0-----------drive1------\n")*/
		"Dt RW act. Cnt    %2dT              %2dT"
		"               %2dT              %2dT\n"
		"Dt RW rec. Cnt    %2dT              %2dT"
		"               %2dT              %2dT\n\n",
		(reg5xh & 0x70) ? ((reg5xh & 0x70) >> 4) : 8,
		(reg5xh1 & 0x70) ? ((reg5xh1 & 0x70) >> 4) : 8,
		(reg5yh & 0x70) ? ((reg5yh & 0x70) >> 4) : 8,
		(reg5yh1 & 0x70) ? ((reg5yh1 & 0x70) >> 4) : 8,
		(reg5xh & 0x0f) ? (reg5xh & 0x0f) : 16,
		(reg5xh1 & 0x0f) ? (reg5xh1 & 0x0f) : 16,
		(reg5yh & 0x0f) ? (reg5yh & 0x0f) : 16,
		(reg5yh1 & 0x0f) ? (reg5yh1 & 0x0f) : 16 );

	p += sprintf(p,
		"-----------------------------------UDMA Timings"
		"--------------------------------\n\n");

	pci_read_config_byte(bmide_dev, 0x56, &reg5xh);
	pci_read_config_byte(bmide_dev, 0x57, &reg5yh);
	p += sprintf(p,
		"UDMA:             %s               %s"
		"                %s               %s\n"
		"UDMA timings:     %s             %s"
		"              %s             %s\n\n",
		(reg5xh & 0x08) ? "OK" : "No",
		(reg5xh & 0x80) ? "OK" : "No",
		(reg5yh & 0x08) ? "OK" : "No",
		(reg5yh & 0x80) ? "OK" : "No",
		udmaT[(reg5xh & 0x07)],
		udmaT[(reg5xh & 0x70) >> 4],
		udmaT[reg5yh & 0x07],
		udmaT[(reg5yh & 0x70) >> 4] );

	return p-buffer; /* => must be less than 4k! */
}
#endif  /* defined(DISPLAY_ALI_TIMINGS) && defined(CONFIG_IDE_PROC_FS) */

/**
 *	ali15x3_tune_pio	-	set up chipset for PIO mode
 *	@drive: drive to tune
 *	@pio: desired mode
 *
 *	Select the best PIO mode for the drive in question.
 *	Then program the controller for this mode.
 *
 *	Returns the PIO mode programmed.
 */
 
static u8 ali15x3_tune_pio (ide_drive_t *drive, u8 pio)
{
	ide_hwif_t *hwif = HWIF(drive);
	struct pci_dev *dev = hwif->pci_dev;
	int s_time, a_time, c_time;
	u8 s_clc, a_clc, r_clc;
	unsigned long flags;
	int bus_speed = system_bus_clock();
	int port = hwif->channel ? 0x5c : 0x58;
	int portFIFO = hwif->channel ? 0x55 : 0x54;
	u8 cd_dma_fifo = 0;
	int unit = drive->select.b.unit & 1;

	pio = ide_get_best_pio_mode(drive, pio, 5);
	s_time = ide_pio_timings[pio].setup_time;
	a_time = ide_pio_timings[pio].active_time;
	if ((s_clc = (s_time * bus_speed + 999) / 1000) >= 8)
		s_clc = 0;
	if ((a_clc = (a_time * bus_speed + 999) / 1000) >= 8)
		a_clc = 0;
	c_time = ide_pio_timings[pio].cycle_time;

#if 0
	if ((r_clc = ((c_time - s_time - a_time) * bus_speed + 999) / 1000) >= 16)
		r_clc = 0;
#endif

	if (!(r_clc = (c_time * bus_speed + 999) / 1000 - a_clc - s_clc)) {
		r_clc = 1;
	} else {
		if (r_clc >= 16)
			r_clc = 0;
	}
	local_irq_save(flags);
	
	/* 
	 * PIO mode => ATA FIFO on, ATAPI FIFO off
	 */
	pci_read_config_byte(dev, portFIFO, &cd_dma_fifo);
	if (drive->media==ide_disk) {
		if (unit) {
			pci_write_config_byte(dev, portFIFO, (cd_dma_fifo & 0x0F) | 0x50);
		} else {
			pci_write_config_byte(dev, portFIFO, (cd_dma_fifo & 0xF0) | 0x05);
		}
	} else {
		if (unit) {
			pci_write_config_byte(dev, portFIFO, cd_dma_fifo & 0x0F);
		} else {
			pci_write_config_byte(dev, portFIFO, cd_dma_fifo & 0xF0);
		}
	}
	
	pci_write_config_byte(dev, port, s_clc);
	pci_write_config_byte(dev, port+drive->select.b.unit+2, (a_clc << 4) | r_clc);
	local_irq_restore(flags);

	/*
	 * setup   active  rec
	 * { 70,   165,    365 },   PIO Mode 0
	 * { 50,   125,    208 },   PIO Mode 1
	 * { 30,   100,    110 },   PIO Mode 2
	 * { 30,   80,     70  },   PIO Mode 3 with IORDY
	 * { 25,   70,     25  },   PIO Mode 4 with IORDY  ns
	 * { 20,   50,     30  }    PIO Mode 5 with IORDY (nonstandard)
	 */

	return pio;
}

/**
 *	ali15x3_tune_drive	-	set up drive for PIO mode
 *	@drive: drive to tune
 *	@pio: desired mode
 *
 *	Program the controller with the best PIO timing for the given drive.
 *	Then set up the drive itself.
 */

static void ali15x3_tune_drive (ide_drive_t *drive, u8 pio)
{
	pio = ali15x3_tune_pio(drive, pio);
	(void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
}

/**
 *	ali_udma_filter		-	compute UDMA mask
 *	@drive: IDE device
 *
 *	Return available UDMA modes.
 *
 *	The actual rules for the ALi are:
 *		No UDMA on revisions <= 0x20
 *		Disk only for revisions < 0xC2
 *		Not WDC drives for revisions < 0xC2
 *
 *	FIXME: WDC ifdef needs to die
 */

static u8 ali_udma_filter(ide_drive_t *drive)
{
	if (m5229_revision > 0x20 && m5229_revision < 0xC2) {
		if (drive->media != ide_disk)
			return 0;
#ifndef CONFIG_WDC_ALI15X3
		if (chip_is_1543c_e && strstr(drive->id->model, "WDC "))
			return 0;
#endif
	}

	return drive->hwif->ultra_mask;
}

/**
 *	ali15x3_tune_chipset	-	set up chipset/drive for new speed
 *	@drive: drive to configure for
 *	@xferspeed: desired speed
 *
 *	Configure the hardware for the desired IDE transfer mode.
 *	We also do the needed drive configuration through helpers
 */
 
static int ali15x3_tune_chipset (ide_drive_t *drive, u8 xferspeed)
{
	ide_hwif_t *hwif	= HWIF(drive);
	struct pci_dev *dev	= hwif->pci_dev;
	u8 speed		= ide_rate_filter(drive, xferspeed);
	u8 speed1		= speed;
	u8 unit			= (drive->select.b.unit & 0x01);
	u8 tmpbyte		= 0x00;
	int m5229_udma		= (hwif->channel) ? 0x57 : 0x56;

	if (speed == XFER_UDMA_6)
		speed1 = 0x47;

	if (speed < XFER_UDMA_0) {
		u8 ultra_enable	= (unit) ? 0x7f : 0xf7;
		/*
		 * clear "ultra enable" bit
		 */
		pci_read_config_byte(dev, m5229_udma, &tmpbyte);
		tmpbyte &= ultra_enable;
		pci_write_config_byte(dev, m5229_udma, tmpbyte);

		if (speed < XFER_SW_DMA_0)
			(void) ali15x3_tune_pio(drive, speed - XFER_PIO_0);
	} else {
		pci_read_config_byte(dev, m5229_udma, &tmpbyte);
		tmpbyte &= (0x0f << ((1-unit) << 2));
		/*
		 * enable ultra dma and set timing
		 */
		tmpbyte |= ((0x08 | ((4-speed1)&0x07)) << (unit << 2));
		pci_write_config_byte(dev, m5229_udma, tmpbyte);
		if (speed >= XFER_UDMA_3) {
			pci_read_config_byte(dev, 0x4b, &tmpbyte);
			tmpbyte |= 1;
			pci_write_config_byte(dev, 0x4b, tmpbyte);
		}
	}
	return (ide_config_drive_speed(drive, speed));
}

/**
 *	ali15x3_config_drive_for_dma	-	configure for DMA
 *	@drive: drive to configure
 *
 *	Configure a drive for DMA operation. If DMA is not possible we
 *	drop the drive into PIO mode instead.
 */

static int ali15x3_config_drive_for_dma(ide_drive_t *drive)
{
	drive->init_speed = 0;

	if (ide_tune_dma(drive))
		return 0;

	ali15x3_tune_drive(drive, 255);

	return -1;
}

/**
 *	ali15x3_dma_setup	-	begin a DMA phase
 *	@drive:	target device
 *
 *	Returns 1 if the DMA cannot be performed, zero on success.
 */

static int ali15x3_dma_setup(ide_drive_t *drive)
{
	if (m5229_revision < 0xC2 && drive->media != ide_disk) {
		if (rq_data_dir(drive->hwif->hwgroup->rq))
			return 1;	/* try PIO instead of DMA */
	}
	return ide_dma_setup(drive);
}

/**
 *	init_chipset_ali15x3	-	Initialise an ALi IDE controller
 *	@dev: PCI device
 *	@name: Name of the controller
 *
 *	This function initializes the ALI IDE controller and where 
 *	appropriate also sets up the 1533 southbridge.
 */
  
static unsigned int __devinit init_chipset_ali15x3 (struct pci_dev *dev, const char *name)
{
	unsigned long flags;
	u8 tmpbyte;
	struct pci_dev *north = pci_get_slot(dev->bus, PCI_DEVFN(0,0));

	m5229_revision = dev->revision;

	isa_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);

#if defined(DISPLAY_ALI_TIMINGS) && defined(CONFIG_IDE_PROC_FS)
	if (!ali_proc) {
		ali_proc = 1;
		bmide_dev = dev;
		ide_pci_create_host_proc("ali", ali_get_info);
	}
#endif  /* defined(DISPLAY_ALI_TIMINGS) && defined(CONFIG_IDE_PROC_FS) */

	local_irq_save(flags);

	if (m5229_revision < 0xC2) {
		/*
		 * revision 0x20 (1543-E, 1543-F)
		 * revision 0xC0, 0xC1 (1543C-C, 1543C-D, 1543C-E)
		 * clear CD-ROM DMA write bit, m5229, 0x4b, bit 7
		 */
		pci_read_config_byte(dev, 0x4b, &tmpbyte);
		/*
		 * clear bit 7
		 */
		pci_write_config_byte(dev, 0x4b, tmpbyte & 0x7F);
		goto out;
	}

	/*
	 * 1543C-B?, 1535, 1535D, 1553
	 * Note 1: not all "motherboard" support this detection
	 * Note 2: if no udma 66 device, the detection may "error".
	 *         but in this case, we will not set the device to
	 *         ultra 66, the detection result is not important
	 */

	/*
	 * enable "Cable Detection", m5229, 0x4b, bit3
	 */
	pci_read_config_byte(dev, 0x4b, &tmpbyte);
	pci_write_config_byte(dev, 0x4b, tmpbyte | 0x08);

	/*
	 * We should only tune the 1533 enable if we are using an ALi
	 * North bridge. We might have no north found on some zany
	 * box without a device at 0:0.0. The ALi bridge will be at
	 * 0:0.0 so if we didn't find one we know what is cooking.
	 */
	if (north && north->vendor != PCI_VENDOR_ID_AL)
		goto out;

	if (m5229_revision < 0xC5 && isa_dev)
	{	
		/*
		 * set south-bridge's enable bit, m1533, 0x79
		 */

		pci_read_config_byte(isa_dev, 0x79, &tmpbyte);
		if (m5229_revision == 0xC2) {
			/*
			 * 1543C-B0 (m1533, 0x79, bit 2)
			 */
			pci_write_config_byte(isa_dev, 0x79, tmpbyte | 0x04);
		} else if (m5229_revision >= 0xC3) {
			/*
			 * 1553/1535 (m1533, 0x79, bit 1)
			 */
			pci_write_config_byte(isa_dev, 0x79, tmpbyte | 0x02);
		}
	}
out:
	pci_dev_put(north);
	pci_dev_put(isa_dev);
	local_irq_restore(flags);
	return 0;
}

/*
 *	Cable special cases
 */

static const struct dmi_system_id cable_dmi_table[] = {
	{
		.ident = "HP Pavilion N5430",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
			DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
		},
	},
	{
		.ident = "Toshiba Satellite S1800-814",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
			DMI_MATCH(DMI_PRODUCT_NAME, "S1800-814"),
		},
	},
	{ }
};

static int ali_cable_override(struct pci_dev *pdev)
{
	/* Fujitsu P2000 */
	if (pdev->subsystem_vendor == 0x10CF &&
	    pdev->subsystem_device == 0x10AF)
		return 1;

	/* Systems by DMI */
	if (dmi_check_system(cable_dmi_table))
		return 1;

	return 0;
}

/**
 *	ata66_ali15x3	-	check for UDMA 66 support
 *	@hwif: IDE interface
 *
 *	This checks if the controller and the cable are capable
 *	of UDMA66 transfers. It doesn't check the drives.
 *	But see note 2 below!
 *
 *	FIXME: frobs bits that are not defined on newer ALi devicea
 */

static u8 __devinit ata66_ali15x3(ide_hwif_t *hwif)
{
	struct pci_dev *dev	= hwif->pci_dev;
	unsigned long flags;
	u8 cbl = ATA_CBL_PATA40, tmpbyte;

	local_irq_save(flags);

	if (m5229_revision >= 0xC2) {
		/*
		 * m5229 80-pin cable detection (from Host View)
		 *
		 * 0x4a bit0 is 0 => primary channel has 80-pin
		 * 0x4a bit1 is 0 => secondary channel has 80-pin
		 *
		 * Certain laptops use short but suitable cables
		 * and don't implement the detect logic.
		 */
		if (ali_cable_override(dev))
			cbl = ATA_CBL_PATA40_SHORT;
		else {
			pci_read_config_byte(dev, 0x4a, &tmpbyte);
			if ((tmpbyte & (1 << hwif->channel)) == 0)
				cbl = ATA_CBL_PATA80;
		}
	} else {
		/*
		 * check m1533, 0x5e, bit 1~4 == 1001 => & 00011110 = 00010010
		 */
		pci_read_config_byte(isa_dev, 0x5e, &tmpbyte);
		chip_is_1543c_e = ((tmpbyte & 0x1e) == 0x12) ? 1: 0;
	}

	/*
	 * CD_ROM DMA on (m5229, 0x53, bit0)
	 *      Enable this bit even if we want to use PIO
	 * PIO FIFO off (m5229, 0x53, bit1)
	 *      The hardware will use 0x54h and 0x55h to control PIO FIFO
	 *	(Not on later devices it seems)
	 *
	 *	0x53 changes meaning on later revs - we must no touch
	 *	bit 1 on them. Need to check if 0x20 is the right break
	 */
	 
	pci_read_config_byte(dev, 0x53, &tmpbyte);
	
	if(m5229_revision <= 0x20)
		tmpbyte = (tmpbyte & (~0x02)) | 0x01;
	else if (m5229_revision == 0xc7 || m5229_revision == 0xc8)
		tmpbyte |= 0x03;
	else
		tmpbyte |= 0x01;

	pci_write_config_byte(dev, 0x53, tmpbyte);

	local_irq_restore(flags);

	return cbl;
}

/**
 *	init_hwif_common_ali15x3	-	Set up ALI IDE hardware
 *	@hwif: IDE interface
 *
 *	Initialize the IDE structure side of the ALi 15x3 driver.
 */
 
static void __devinit init_hwif_common_ali15x3 (ide_hwif_t *hwif)
{
	hwif->autodma = 0;
	hwif->tuneproc = &ali15x3_tune_drive;
	hwif->speedproc = &ali15x3_tune_chipset;
	hwif->udma_filter = &ali_udma_filter;

	/* don't use LBA48 DMA on ALi devices before rev 0xC5 */
	hwif->no_lba48_dma = (m5229_revision <= 0xC4) ? 1 : 0;

	if (!hwif->dma_base) {
		hwif->drives[0].autotune = 1;
		hwif->drives[1].autotune = 1;
		return;
	}

	if (m5229_revision > 0x20)
		hwif->atapi_dma = 1;

	if (m5229_revision <= 0x20)
		hwif->ultra_mask = 0x00; /* no udma */
	else if (m5229_revision < 0xC2)
		hwif->ultra_mask = 0x07; /* udma0-2 */
	else if (m5229_revision == 0xC2 || m5229_revision == 0xC3)
		hwif->ultra_mask = 0x1f; /* udma0-4 */
	else if (m5229_revision == 0xC4)
		hwif->ultra_mask = 0x3f; /* udma0-5 */
	else
		hwif->ultra_mask = 0x7f; /* udma0-6 */

	hwif->mwdma_mask = 0x07;
	hwif->swdma_mask = 0x07;

        if (m5229_revision >= 0x20) {
                /*
                 * M1543C or newer for DMAing
                 */
                hwif->ide_dma_check = &ali15x3_config_drive_for_dma;
		hwif->dma_setup = &ali15x3_dma_setup;
		if (!noautodma)
			hwif->autodma = 1;

		if (hwif->cbl != ATA_CBL_PATA40_SHORT)
			hwif->cbl = ata66_ali15x3(hwif);
	}
	hwif->drives[0].autodma = hwif->autodma;
	hwif->drives[1].autodma = hwif->autodma;
}

/**
 *	init_hwif_ali15x3	-	Initialize the ALI IDE x86 stuff
 *	@hwif: interface to configure
 *
 *	Obtain the IRQ tables for an ALi based IDE solution on the PC
 *	class platforms. This part of the code isn't applicable to the
 *	Sparc systems
 */

static void __devinit init_hwif_ali15x3 (ide_hwif_t *hwif)
{
	u8 ideic, inmir;
	s8 irq_routing_table[] = { -1,  9, 3, 10, 4,  5, 7,  6,
				      1, 11, 0, 12, 0, 14, 0, 15 };
	int irq = -1;

	if (hwif->pci_dev->device == PCI_DEVICE_ID_AL_M5229)
		hwif->irq = hwif->channel ? 15 : 14;

	if (isa_dev) {
		/*
		 * read IDE interface control
		 */
		pci_read_config_byte(isa_dev, 0x58, &ideic);

		/* bit0, bit1 */
		ideic = ideic & 0x03;

		/* get IRQ for IDE Controller */
		if ((hwif->channel && ideic == 0x03) ||
		    (!hwif->channel && !ideic)) {
			/*
			 * get SIRQ1 routing table
			 */
			pci_read_config_byte(isa_dev, 0x44, &inmir);
			inmir = inmir & 0x0f;
			irq = irq_routing_table[inmir];
		} else if (hwif->channel && !(ideic & 0x01)) {
			/*
			 * get SIRQ2 routing table
			 */
			pci_read_config_byte(isa_dev, 0x75, &inmir);
			inmir = inmir & 0x0f;
			irq = irq_routing_table[inmir];
		}
		if(irq >= 0)
			hwif->irq = irq;
	}

	init_hwif_common_ali15x3(hwif);
}

/**
 *	init_dma_ali15x3	-	set up DMA on ALi15x3
 *	@hwif: IDE interface
 *	@dmabase: DMA interface base PCI address
 *
 *	Set up the DMA functionality on the ALi 15x3. For the ALi
 *	controllers this is generic so we can let the generic code do
 *	the actual work.
 */

static void __devinit init_dma_ali15x3 (ide_hwif_t *hwif, unsigned long dmabase)
{
	if (m5229_revision < 0x20)
		return;
	if (!hwif->channel)
		outb(inb(dmabase + 2) & 0x60, dmabase + 2);
	ide_setup_dma(hwif, dmabase, 8);
}

static ide_pci_device_t ali15x3_chipset __devinitdata = {
	.name		= "ALI15X3",
	.init_chipset	= init_chipset_ali15x3,
	.init_hwif	= init_hwif_ali15x3,
	.init_dma	= init_dma_ali15x3,
	.autodma	= AUTODMA,
	.bootable	= ON_BOARD,
	.pio_mask	= ATA_PIO5,
};

/**
 *	alim15x3_init_one	-	set up an ALi15x3 IDE controller
 *	@dev: PCI device to set up
 *
 *	Perform the actual set up for an ALi15x3 that has been found by the
 *	hot plug layer.
 */
 
static int __devinit alim15x3_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
	static struct pci_device_id ati_rs100[] = {
		{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RS100) },
		{ },
	};

	ide_pci_device_t *d = &ali15x3_chipset;

	if (pci_dev_present(ati_rs100))
		printk(KERN_WARNING "alim15x3: ATI Radeon IGP Northbridge is not yet fully tested.\n");

#if defined(CONFIG_SPARC64)
	d->init_hwif = init_hwif_common_ali15x3;
#endif /* CONFIG_SPARC64 */
	return ide_setup_pci_device(dev, d);
}


static struct pci_device_id alim15x3_pci_tbl[] = {
	{ PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M5229, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M5228, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, alim15x3_pci_tbl);

static struct pci_driver driver = {
	.name		= "ALI15x3_IDE",
	.id_table	= alim15x3_pci_tbl,
	.probe		= alim15x3_init_one,
};

static int __init ali15x3_ide_init(void)
{
	return ide_pci_register_driver(&driver);
}

module_init(ali15x3_ide_init);

MODULE_AUTHOR("Michael Aubry, Andrzej Krzysztofowicz, CJ, Andre Hedrick, Alan Cox");
MODULE_DESCRIPTION("PCI driver module for ALi 15x3 IDE");
MODULE_LICENSE("GPL");