alim15x3.c

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		pci_write_config_byte(dev, m5229_udma, tmpbyte);

		/*
		 * FIXME: Oh, my... DMA timings are never set.
		 */
	} 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);
		}
	}
}

/**
 *	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);
		/*
		 * check m1533, 0x5e, bit 1~4 == 1001 => & 00011110 = 00010010
		 */
		if (m5229_revision >= 0x20 && isa_dev) {
			pci_read_config_byte(isa_dev, 0x5e, &tmpbyte);
			chip_is_1543c_e = ((tmpbyte & 0x1e) == 0x12) ? 1: 0;
		}
		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:
	/*
	 * 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.
	 */
	if (m5229_revision >= 0x20) {
		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);
	}
	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;

	/* Mitac 8317 (Winbook-A) and relatives */
	if (pdev->subsystem_vendor == 0x1071 &&
	    pdev->subsystem_device == 0x8317)
		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;
		}
	}

	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->set_pio_mode = &ali_set_pio_mode;
	hwif->set_dma_mode = &ali_set_dma_mode;
	hwif->udma_filter = &ali_udma_filter;

	if (hwif->dma_base == 0)
		return;

	hwif->dma_setup = &ali15x3_dma_setup;

	if (hwif->cbl != ATA_CBL_PATA40_SHORT)
		hwif->cbl = ata66_ali15x3(hwif);
}

/**
 *	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 const struct ide_port_info ali15x3_chipset __devinitdata = {
	.name		= "ALI15X3",
	.init_chipset	= init_chipset_ali15x3,
	.init_hwif	= init_hwif_ali15x3,
	.init_dma	= init_dma_ali15x3,
	.host_flags	= IDE_HFLAG_BOOTABLE,
	.pio_mask	= ATA_PIO5,
	.swdma_mask	= ATA_SWDMA2,
	.mwdma_mask	= ATA_MWDMA2,
};

/**
 *	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) },
		{ },
	};

	struct ide_port_info d = ali15x3_chipset;
	u8 rev = dev->revision;

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

	/* don't use LBA48 DMA on ALi devices before rev 0xC5 */
	if (rev <= 0xC4)
		d.host_flags |= IDE_HFLAG_NO_LBA48_DMA;

	if (rev >= 0x20) {
		if (rev == 0x20)
			d.host_flags |= IDE_HFLAG_NO_ATAPI_DMA;

		if (rev < 0xC2)
			d.udma_mask = ATA_UDMA2;
		else if (rev == 0xC2 || rev == 0xC3)
			d.udma_mask = ATA_UDMA4;
		else if (rev == 0xC4)
			d.udma_mask = ATA_UDMA5;
		else
			d.udma_mask = ATA_UDMA6;
	}

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


static const struct pci_device_id alim15x3_pci_tbl[] = {
	{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5229), 0 },
	{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5228), 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");