[deliverable/linux.git] / drivers / ata / pata_via.c

/*
 * pata_via.c 	- VIA PATA for new ATA layer
 *			  (C) 2005-2006 Red Hat Inc
 *			  Alan Cox <alan@redhat.com>
 *
 *  Documentation
 *	Most chipset documentation available under NDA only
 *
 *  VIA version guide
 *	VIA VT82C561	-	early design, uses ata_generic currently
 *	VIA VT82C576	-	MWDMA, 33Mhz
 *	VIA VT82C586	-	MWDMA, 33Mhz
 *	VIA VT82C586a	-	Added UDMA to 33Mhz
 *	VIA VT82C586b	-	UDMA33
 *	VIA VT82C596a	-	Nonfunctional UDMA66
 *	VIA VT82C596b	-	Working UDMA66
 *	VIA VT82C686	-	Nonfunctional UDMA66
 *	VIA VT82C686a	-	Working UDMA66
 *	VIA VT82C686b	-	Updated to UDMA100
 *	VIA VT8231	-	UDMA100
 *	VIA VT8233	-	UDMA100
 *	VIA VT8233a	-	UDMA133
 *	VIA VT8233c	-	UDMA100
 *	VIA VT8235	-	UDMA133
 *	VIA VT8237	-	UDMA133
 *	VIA VT8237S	-	UDMA133
 *	VIA VT8251	-	UDMA133
 *
 *	Most registers remain compatible across chips. Others start reserved
 *	and acquire sensible semantics if set to 1 (eg cable detect). A few
 *	exceptions exist, notably around the FIFO settings.
 *
 *	One additional quirk of the VIA design is that like ALi they use few
 *	PCI IDs for a lot of chips.
 *
 *	Based heavily on:
 *
 * Version 3.38
 *
 * VIA IDE driver for Linux. Supported southbridges:
 *
 *   vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
 *   vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
 *   vt8235, vt8237
 *
 * Copyright (c) 2000-2002 Vojtech Pavlik
 *
 * Based on the work of:
 *	Michel Aubry
 *	Jeff Garzik
 *	Andre Hedrick

 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/dmi.h>

#define DRV_NAME "pata_via"
#define DRV_VERSION "0.3.3"

/*
 *	The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
 *	driver.
 */

enum {
	VIA_UDMA	= 0x007,
	VIA_UDMA_NONE	= 0x000,
	VIA_UDMA_33	= 0x001,
	VIA_UDMA_66	= 0x002,
	VIA_UDMA_100	= 0x003,
	VIA_UDMA_133	= 0x004,
	VIA_BAD_PREQ	= 0x010, /* Crashes if PREQ# till DDACK# set */
	VIA_BAD_CLK66	= 0x020, /* 66 MHz clock doesn't work correctly */
	VIA_SET_FIFO	= 0x040, /* Needs to have FIFO split set */
	VIA_NO_UNMASK	= 0x080, /* Doesn't work with IRQ unmasking on */
	VIA_BAD_ID	= 0x100, /* Has wrong vendor ID (0x1107) */
	VIA_BAD_AST	= 0x200, /* Don't touch Address Setup Timing */
	VIA_NO_ENABLES	= 0x400, /* Has no enablebits */
	VIA_SATA_PATA	= 0x800, /* SATA/PATA combined configuration */
};

/*
 * VIA SouthBridge chips.
 */

static const struct via_isa_bridge {
	const char *name;
	u16 id;
	u8 rev_min;
	u8 rev_max;
	u16 flags;
} via_isa_bridges[] = {
	{ "vx800",	PCI_DEVICE_ID_VIA_VX800,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8237s",	PCI_DEVICE_ID_VIA_8237S,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8251",	PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "cx700",	PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_SATA_PATA },
	{ "vt6410",	PCI_DEVICE_ID_VIA_6410,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES},
	{ "vt8237a",	PCI_DEVICE_ID_VIA_8237A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8237",	PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8235",	PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8233a",	PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8233c",	PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, VIA_UDMA_100 },
	{ "vt8233",	PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, VIA_UDMA_100 },
	{ "vt8231",	PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, VIA_UDMA_100 },
	{ "vt82c686b",	PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, VIA_UDMA_100 },
	{ "vt82c686a",	PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, VIA_UDMA_66 },
	{ "vt82c686",	PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
	{ "vt82c596b",	PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, VIA_UDMA_66 },
	{ "vt82c596a",	PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
	{ "vt82c586b",	PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
	{ "vt82c586b",	PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
	{ "vt82c586b",	PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
	{ "vt82c586a",	PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
	{ "vt82c586",	PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
	{ "vt82c576",	PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
	{ "vt82c576",	PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
	{ NULL }
};


/*
 *	Cable special cases
 */

static const struct dmi_system_id cable_dmi_table[] = {
	{
		.ident = "Acer Ferrari 3400",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
			DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
		},
	},
	{ }
};

static int via_cable_override(struct pci_dev *pdev)
{
	/* Systems by DMI */
	if (dmi_check_system(cable_dmi_table))
		return 1;
	/* Arima W730-K8/Targa Visionary 811/... */
	if (pdev->subsystem_vendor == 0x161F && pdev->subsystem_device == 0x2032)
		return 1;
	return 0;
}


/**
 *	via_cable_detect	-	cable detection
 *	@ap: ATA port
 *
 *	Perform cable detection. Actually for the VIA case the BIOS
 *	already did this for us. We read the values provided by the
 *	BIOS. If you are using an 8235 in a non-PC configuration you
 *	may need to update this code.
 *
 *	Hotplug also impacts on this.
 */

static int via_cable_detect(struct ata_port *ap) {
	const struct via_isa_bridge *config = ap->host->private_data;
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u32 ata66;

	if (via_cable_override(pdev))
		return ATA_CBL_PATA40_SHORT;

	if ((config->flags & VIA_SATA_PATA) && ap->port_no == 0)
		return ATA_CBL_SATA;

	/* Early chips are 40 wire */
	if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
		return ATA_CBL_PATA40;
	/* UDMA 66 chips have only drive side logic */
	else if ((config->flags & VIA_UDMA) < VIA_UDMA_100)
		return ATA_CBL_PATA_UNK;
	/* UDMA 100 or later */
	pci_read_config_dword(pdev, 0x50, &ata66);
	/* Check both the drive cable reporting bits, we might not have
	   two drives */
	if (ata66 & (0x10100000 >> (16 * ap->port_no)))
		return ATA_CBL_PATA80;
	/* Check with ACPI so we can spot BIOS reported SATA bridges */
	if (ata_acpi_init_gtm(ap) &&
	    ata_acpi_cbl_80wire(ap, ata_acpi_init_gtm(ap)))
		return ATA_CBL_PATA80;
	return ATA_CBL_PATA40;
}

static int via_pre_reset(struct ata_link *link, unsigned long deadline)
{
	struct ata_port *ap = link->ap;
	const struct via_isa_bridge *config = ap->host->private_data;

	if (!(config->flags & VIA_NO_ENABLES)) {
		static const struct pci_bits via_enable_bits[] = {
			{ 0x40, 1, 0x02, 0x02 },
			{ 0x40, 1, 0x01, 0x01 }
		};
		struct pci_dev *pdev = to_pci_dev(ap->host->dev);
		if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
			return -ENOENT;
	}

	return ata_std_prereset(link, deadline);
}


/**
 *	via_error_handler		-	reset for VIA chips
 *	@ap: ATA port
 *
 *	Handle the reset callback for the later chips with cable detect
 */

static void via_error_handler(struct ata_port *ap)
{
	ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}

/**
 *	via_do_set_mode	-	set initial PIO mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 *	@mode: ATA mode being programmed
 *	@tdiv: Clocks per PCI clock
 *	@set_ast: Set to program address setup
 *	@udma_type: UDMA mode/format of registers
 *
 *	Program the VIA registers for DMA and PIO modes. Uses the ata timing
 *	support in order to compute modes.
 *
 *	FIXME: Hotplug will require we serialize multiple mode changes
 *	on the two channels.
 */

static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	struct ata_device *peer = ata_dev_pair(adev);
	struct ata_timing t, p;
	static int via_clock = 33333;	/* Bus clock in kHZ - ought to be tunable one day */
	unsigned long T =  1000000000 / via_clock;
	unsigned long UT = T/tdiv;
	int ut;
	int offset = 3 - (2*ap->port_no) - adev->devno;

	/* Calculate the timing values we require */
	ata_timing_compute(adev, mode, &t, T, UT);

	/* We share 8bit timing so we must merge the constraints */
	if (peer) {
		if (peer->pio_mode) {
			ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
			ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
		}
	}

	/* Address setup is programmable but breaks on UDMA133 setups */
	if (set_ast) {
		u8 setup;	/* 2 bits per drive */
		int shift = 2 * offset;

		pci_read_config_byte(pdev, 0x4C, &setup);
		setup &= ~(3 << shift);
		setup |= FIT(t.setup, 1, 4) << shift;	/* 1,4 or 1,4 - 1  FIXME */
		pci_write_config_byte(pdev, 0x4C, setup);
	}

	/* Load the PIO mode bits */
	pci_write_config_byte(pdev, 0x4F - ap->port_no,
		((FIT(t.act8b, 1, 16) - 1) << 4) | (FIT(t.rec8b, 1, 16) - 1));
	pci_write_config_byte(pdev, 0x48 + offset,
		((FIT(t.active, 1, 16) - 1) << 4) | (FIT(t.recover, 1, 16) - 1));

	/* Load the UDMA bits according to type */
	switch(udma_type) {
		default:
			/* BUG() ? */
			/* fall through */
		case 33:
			ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 5) - 2)) : 0x03;
			break;
		case 66:
			ut = t.udma ? (0xe8 | (FIT(t.udma, 2, 9) - 2)) : 0x0f;
			break;
		case 100:
			ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
			break;
		case 133:
			ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
			break;
	}

	/* Set UDMA unless device is not UDMA capable */
	if (udma_type && t.udma) {
		u8 cable80_status;

		/* Get 80-wire cable detection bit */
		pci_read_config_byte(pdev, 0x50 + offset, &cable80_status);
		cable80_status &= 0x10;

		pci_write_config_byte(pdev, 0x50 + offset, ut | cable80_status);
	}
}

static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	const struct via_isa_bridge *config = ap->host->private_data;
	int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
	int mode = config->flags & VIA_UDMA;
	static u8 tclock[5] = { 1, 1, 2, 3, 4 };
	static u8 udma[5] = { 0, 33, 66, 100, 133 };

	via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
}

static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
	const struct via_isa_bridge *config = ap->host->private_data;
	int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
	int mode = config->flags & VIA_UDMA;
	static u8 tclock[5] = { 1, 1, 2, 3, 4 };
	static u8 udma[5] = { 0, 33, 66, 100, 133 };

	via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
}

static struct scsi_host_template via_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations via_port_ops = {
	.inherits	= &ata_bmdma_port_ops,
	.cable_detect	= via_cable_detect,
	.set_piomode	= via_set_piomode,
	.set_dmamode	= via_set_dmamode,
	.error_handler	= via_error_handler,
};

static struct ata_port_operations via_port_ops_noirq = {
	.inherits	= &via_port_ops,
	.data_xfer	= ata_data_xfer_noirq,
};

/**
 *	via_config_fifo		-	set up the FIFO
 *	@pdev: PCI device
 *	@flags: configuration flags
 *
 *	Set the FIFO properties for this device if necessary. Used both on
 *	set up and on and the resume path
 */

static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
{
	u8 enable;

	/* 0x40 low bits indicate enabled channels */
	pci_read_config_byte(pdev, 0x40 , &enable);
	enable &= 3;

	if (flags & VIA_SET_FIFO) {
		static const u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
		u8 fifo;

		pci_read_config_byte(pdev, 0x43, &fifo);

		/* Clear PREQ# until DDACK# for errata */
		if (flags & VIA_BAD_PREQ)
			fifo &= 0x7F;
		else
			fifo &= 0x9f;
		/* Turn on FIFO for enabled channels */
		fifo |= fifo_setting[enable];
		pci_write_config_byte(pdev, 0x43, fifo);
	}
}

/**
 *	via_init_one		-	discovery callback
 *	@pdev: PCI device
 *	@id: PCI table info
 *
 *	A VIA IDE interface has been discovered. Figure out what revision
 *	and perform configuration work before handing it to the ATA layer
 */

static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
	/* Early VIA without UDMA support */
	static const struct ata_port_info via_mwdma_info = {
		.sht = &via_sht,
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.port_ops = &via_port_ops
	};
	/* Ditto with IRQ masking required */
	static const struct ata_port_info via_mwdma_info_borked = {
		.sht = &via_sht,
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.port_ops = &via_port_ops_noirq,
	};
	/* VIA UDMA 33 devices (and borked 66) */
	static const struct ata_port_info via_udma33_info = {
		.sht = &via_sht,
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.udma_mask = ATA_UDMA2,
		.port_ops = &via_port_ops
	};
	/* VIA UDMA 66 devices */
	static const struct ata_port_info via_udma66_info = {
		.sht = &via_sht,
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.udma_mask = ATA_UDMA4,
		.port_ops = &via_port_ops
	};
	/* VIA UDMA 100 devices */
	static const struct ata_port_info via_udma100_info = {
		.sht = &via_sht,
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.udma_mask = ATA_UDMA5,
		.port_ops = &via_port_ops
	};
	/* UDMA133 with bad AST (All current 133) */
	static const struct ata_port_info via_udma133_info = {
		.sht = &via_sht,
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.udma_mask = ATA_UDMA6,	/* FIXME: should check north bridge */
		.port_ops = &via_port_ops
	};
	struct ata_port_info type;
	const struct ata_port_info *ppi[] = { &type, NULL };
	struct pci_dev *isa = NULL;
	const struct via_isa_bridge *config;
	static int printed_version;
	u8 enable;
	u32 timing;
	int rc;

	if (!printed_version++)
		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");

	rc = pcim_enable_device(pdev);
	if (rc)
		return rc;

	/* To find out how the IDE will behave and what features we
	   actually have to look at the bridge not the IDE controller */
	for (config = via_isa_bridges; config->id; config++)
		if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
			!!(config->flags & VIA_BAD_ID),
			config->id, NULL))) {

			if (isa->revision >= config->rev_min &&
			    isa->revision <= config->rev_max)
				break;
			pci_dev_put(isa);
		}

	if (!config->id) {
		printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
		return -ENODEV;
	}
	pci_dev_put(isa);

	/* 0x40 low bits indicate enabled channels */
	pci_read_config_byte(pdev, 0x40 , &enable);
	enable &= 3;
	if (enable == 0) {
		return -ENODEV;
	}

	/* Initialise the FIFO for the enabled channels. */
	via_config_fifo(pdev, config->flags);

	/* Clock set up */
	switch(config->flags & VIA_UDMA) {
		case VIA_UDMA_NONE:
			if (config->flags & VIA_NO_UNMASK)
				type = via_mwdma_info_borked;
			else
				type = via_mwdma_info;
			break;
		case VIA_UDMA_33:
			type = via_udma33_info;
			break;
		case VIA_UDMA_66:
			type = via_udma66_info;
			/* The 66 MHz devices require we enable the clock */
			pci_read_config_dword(pdev, 0x50, &timing);
			timing |= 0x80008;
			pci_write_config_dword(pdev, 0x50, timing);
			break;
		case VIA_UDMA_100:
			type = via_udma100_info;
			break;
		case VIA_UDMA_133:
			type = via_udma133_info;
			break;
		default:
			WARN_ON(1);
			return -ENODEV;
	}

	if (config->flags & VIA_BAD_CLK66) {
		/* Disable the 66MHz clock on problem devices */
		pci_read_config_dword(pdev, 0x50, &timing);
		timing &= ~0x80008;
		pci_write_config_dword(pdev, 0x50, timing);
	}

	/* We have established the device type, now fire it up */
	type.private_data = (void *)config;

	return ata_pci_init_one(pdev, ppi);
}

#ifdef CONFIG_PM
/**
 *	via_reinit_one		-	reinit after resume
 *	@pdev; PCI device
 *
 *	Called when the VIA PATA device is resumed. We must then
 *	reconfigure the fifo and other setup we may have altered. In
 *	addition the kernel needs to have the resume methods on PCI
 *	quirk supported.
 */

static int via_reinit_one(struct pci_dev *pdev)
{
	u32 timing;
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
	const struct via_isa_bridge *config = host->private_data;
	int rc;

	rc = ata_pci_device_do_resume(pdev);
	if (rc)
		return rc;

	via_config_fifo(pdev, config->flags);

	if ((config->flags & VIA_UDMA) == VIA_UDMA_66) {
		/* The 66 MHz devices require we enable the clock */
		pci_read_config_dword(pdev, 0x50, &timing);
		timing |= 0x80008;
		pci_write_config_dword(pdev, 0x50, timing);
	}
	if (config->flags & VIA_BAD_CLK66) {
		/* Disable the 66MHz clock on problem devices */
		pci_read_config_dword(pdev, 0x50, &timing);
		timing &= ~0x80008;
		pci_write_config_dword(pdev, 0x50, timing);
	}

	ata_host_resume(host);
	return 0;
}
#endif

static const struct pci_device_id via[] = {
	{ PCI_VDEVICE(VIA, 0x0571), },
	{ PCI_VDEVICE(VIA, 0x0581), },
	{ PCI_VDEVICE(VIA, 0x1571), },
	{ PCI_VDEVICE(VIA, 0x3164), },
	{ PCI_VDEVICE(VIA, 0x5324), },

	{ },
};

static struct pci_driver via_pci_driver = {
	.name 		= DRV_NAME,
	.id_table	= via,
	.probe 		= via_init_one,
	.remove		= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend	= ata_pci_device_suspend,
	.resume		= via_reinit_one,
#endif
};

static int __init via_init(void)
{
	return pci_register_driver(&via_pci_driver);
}

static void __exit via_exit(void)
{
	pci_unregister_driver(&via_pci_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for VIA PATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, via);
MODULE_VERSION(DRV_VERSION);

module_init(via_init);
module_exit(via_exit);
Commit	Line	Data
669a5db4 JG	1	/*
	2	* pata_via.c - VIA PATA for new ATA layer
	3	* (C) 2005-2006 Red Hat Inc
	4	* Alan Cox <alan@redhat.com>
	5	*
	6	* Documentation
	7	* Most chipset documentation available under NDA only
	8	*
	9	* VIA version guide
	10	* VIA VT82C561 - early design, uses ata_generic currently
	11	* VIA VT82C576 - MWDMA, 33Mhz
	12	* VIA VT82C586 - MWDMA, 33Mhz
	13	* VIA VT82C586a - Added UDMA to 33Mhz
	14	* VIA VT82C586b - UDMA33
	15	* VIA VT82C596a - Nonfunctional UDMA66
	16	* VIA VT82C596b - Working UDMA66
	17	* VIA VT82C686 - Nonfunctional UDMA66
	18	* VIA VT82C686a - Working UDMA66
	19	* VIA VT82C686b - Updated to UDMA100
	20	* VIA VT8231 - UDMA100
	21	* VIA VT8233 - UDMA100
	22	* VIA VT8233a - UDMA133
	23	* VIA VT8233c - UDMA100
	24	* VIA VT8235 - UDMA133
	25	* VIA VT8237 - UDMA133
05c39e50	26	* VIA VT8237S - UDMA133
75f609d2	27	* VIA VT8251 - UDMA133
669a5db4 JG	28	*
	29	* Most registers remain compatible across chips. Others start reserved
	30	* and acquire sensible semantics if set to 1 (eg cable detect). A few
	31	* exceptions exist, notably around the FIFO settings.
	32	*
	33	* One additional quirk of the VIA design is that like ALi they use few
	34	* PCI IDs for a lot of chips.
	35	*
	36	* Based heavily on:
	37	*
	38	* Version 3.38
	39	*
	40	* VIA IDE driver for Linux. Supported southbridges:
	41	*
	42	* vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
	43	* vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
	44	* vt8235, vt8237
	45	*
	46	* Copyright (c) 2000-2002 Vojtech Pavlik
	47	*
	48	* Based on the work of:
	49	* Michel Aubry
	50	* Jeff Garzik
	51	* Andre Hedrick
	52
	53	*/
	54
	55	#include <linux/kernel.h>
	56	#include <linux/module.h>
	57	#include <linux/pci.h>
	58	#include <linux/init.h>
	59	#include <linux/blkdev.h>
	60	#include <linux/delay.h>
	61	#include <scsi/scsi_host.h>
	62	#include <linux/libata.h>
cf5792d2	63	#include <linux/dmi.h>
669a5db4 JG	64
669a5db4 JG	65	#define DRV_NAME "pata_via"
943547ab	66	#define DRV_VERSION "0.3.3"
669a5db4 JG	67
	68	/*
	69	* The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
	70	* driver.
	71	*/
	72
	73	enum {
	74	VIA_UDMA = 0x007,
	75	VIA_UDMA_NONE = 0x000,
	76	VIA_UDMA_33 = 0x001,
	77	VIA_UDMA_66 = 0x002,
	78	VIA_UDMA_100 = 0x003,
	79	VIA_UDMA_133 = 0x004,
	80	VIA_BAD_PREQ = 0x010, /* Crashes if PREQ# till DDACK# set */
	81	VIA_BAD_CLK66 = 0x020, /* 66 MHz clock doesn't work correctly */
	82	VIA_SET_FIFO = 0x040, /* Needs to have FIFO split set */
	83	VIA_NO_UNMASK = 0x080, /* Doesn't work with IRQ unmasking on */
	84	VIA_BAD_ID = 0x100, /* Has wrong vendor ID (0x1107) */
	85	VIA_BAD_AST = 0x200, /* Don't touch Address Setup Timing */
	86	VIA_NO_ENABLES = 0x400, /* Has no enablebits */
7585eb1b	87	VIA_SATA_PATA = 0x800, /* SATA/PATA combined configuration */
669a5db4 JG	88	};
	89
	90	/*
	91	* VIA SouthBridge chips.
	92	*/
	93
	94	static const struct via_isa_bridge {
	95	const char *name;
	96	u16 id;
	97	u8 rev_min;
	98	u8 rev_max;
	99	u16 flags;
	100	} via_isa_bridges[] = {
b311ec4a	101	{ "vx800", PCI_DEVICE_ID_VIA_VX800, 0x00, 0x2f, VIA_UDMA_133 \| VIA_BAD_AST },
e0b874df	102	{ "vt8237s", PCI_DEVICE_ID_VIA_8237S, 0x00, 0x2f, VIA_UDMA_133 \| VIA_BAD_AST },
75f609d2	103	{ "vt8251", PCI_DEVICE_ID_VIA_8251, 0x00, 0x2f, VIA_UDMA_133 \| VIA_BAD_AST },
7585eb1b	104	{ "cx700", PCI_DEVICE_ID_VIA_CX700, 0x00, 0x2f, VIA_UDMA_133 \| VIA_BAD_AST \| VIA_SATA_PATA },
669a5db4 JG	105	{ "vt6410", PCI_DEVICE_ID_VIA_6410, 0x00, 0x2f, VIA_UDMA_133 \| VIA_BAD_AST \| VIA_NO_ENABLES},
	106	{ "vt8237a", PCI_DEVICE_ID_VIA_8237A, 0x00, 0x2f, VIA_UDMA_133 \| VIA_BAD_AST },
	107	{ "vt8237", PCI_DEVICE_ID_VIA_8237, 0x00, 0x2f, VIA_UDMA_133 \| VIA_BAD_AST },
	108	{ "vt8235", PCI_DEVICE_ID_VIA_8235, 0x00, 0x2f, VIA_UDMA_133 \| VIA_BAD_AST },
	109	{ "vt8233a", PCI_DEVICE_ID_VIA_8233A, 0x00, 0x2f, VIA_UDMA_133 \| VIA_BAD_AST },
	110	{ "vt8233c", PCI_DEVICE_ID_VIA_8233C_0, 0x00, 0x2f, VIA_UDMA_100 },
	111	{ "vt8233", PCI_DEVICE_ID_VIA_8233_0, 0x00, 0x2f, VIA_UDMA_100 },
	112	{ "vt8231", PCI_DEVICE_ID_VIA_8231, 0x00, 0x2f, VIA_UDMA_100 },
	113	{ "vt82c686b", PCI_DEVICE_ID_VIA_82C686, 0x40, 0x4f, VIA_UDMA_100 },
	114	{ "vt82c686a", PCI_DEVICE_ID_VIA_82C686, 0x10, 0x2f, VIA_UDMA_66 },
	115	{ "vt82c686", PCI_DEVICE_ID_VIA_82C686, 0x00, 0x0f, VIA_UDMA_33 \| VIA_BAD_CLK66 },
	116	{ "vt82c596b", PCI_DEVICE_ID_VIA_82C596, 0x10, 0x2f, VIA_UDMA_66 },
	117	{ "vt82c596a", PCI_DEVICE_ID_VIA_82C596, 0x00, 0x0f, VIA_UDMA_33 \| VIA_BAD_CLK66 },
	118	{ "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 \| VIA_SET_FIFO },
	119	{ "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 \| VIA_SET_FIFO \| VIA_BAD_PREQ },
	120	{ "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 \| VIA_SET_FIFO },
	121	{ "vt82c586a", PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 \| VIA_SET_FIFO },
	122	{ "vt82c586", PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE \| VIA_SET_FIFO },
	123	{ "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE \| VIA_SET_FIFO \| VIA_NO_UNMASK },
	124	{ "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE \| VIA_SET_FIFO \| VIA_NO_UNMASK \| VIA_BAD_ID },
	125	{ NULL }
	126	};
	127
cf5792d2 AC	128
	129	/*
	130	* Cable special cases
	131	*/
	132
1855256c	133	static const struct dmi_system_id cable_dmi_table[] = {
cf5792d2 AC	134	{
	135	.ident = "Acer Ferrari 3400",
	136	.matches = {
	137	DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
	138	DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
	139	},
	140	},
	141	{ }
	142	};
	143
	144	static int via_cable_override(struct pci_dev *pdev)
	145	{
	146	/* Systems by DMI */
	147	if (dmi_check_system(cable_dmi_table))
	148	return 1;
9edbdbea AC	149	/* Arima W730-K8/Targa Visionary 811/... */
	150	if (pdev->subsystem_vendor == 0x161F && pdev->subsystem_device == 0x2032)
	151	return 1;
cf5792d2 AC	152	return 0;
	153	}
	154
	155
669a5db4 JG	156	/**
	157	* via_cable_detect - cable detection
	158	* @ap: ATA port
	159	*
	160	* Perform cable detection. Actually for the VIA case the BIOS
	161	* already did this for us. We read the values provided by the
	162	* BIOS. If you are using an 8235 in a non-PC configuration you
	163	* may need to update this code.
	164	*
	165	* Hotplug also impacts on this.
	166	*/
	167
	168	static int via_cable_detect(struct ata_port *ap) {
97cb81c3	169	const struct via_isa_bridge *config = ap->host->private_data;
669a5db4 JG	170	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	171	u32 ata66;
	172
cf5792d2 AC	173	if (via_cable_override(pdev))
	174	return ATA_CBL_PATA40_SHORT;
	175
7585eb1b TH	176	if ((config->flags & VIA_SATA_PATA) && ap->port_no == 0)
	177	return ATA_CBL_SATA;
	178
97cb81c3 AC	179	/* Early chips are 40 wire */
	180	if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
	181	return ATA_CBL_PATA40;
	182	/* UDMA 66 chips have only drive side logic */
b447916e	183	else if ((config->flags & VIA_UDMA) < VIA_UDMA_100)
97cb81c3 AC	184	return ATA_CBL_PATA_UNK;
97cb81c3 AC	185	/* UDMA 100 or later */
669a5db4 JG	186	pci_read_config_dword(pdev, 0x50, &ata66);
	187	/* Check both the drive cable reporting bits, we might not have
	188	two drives */
	189	if (ata66 & (0x10100000 >> (16 * ap->port_no)))
	190	return ATA_CBL_PATA80;
7d73a363	191	/* Check with ACPI so we can spot BIOS reported SATA bridges */
021ee9a6 TH	192	if (ata_acpi_init_gtm(ap) &&
021ee9a6 TH	193	ata_acpi_cbl_80wire(ap, ata_acpi_init_gtm(ap)))
7d73a363	194	return ATA_CBL_PATA80;
97cb81c3	195	return ATA_CBL_PATA40;
669a5db4 JG	196	}
669a5db4 JG	197
cc0680a5	198	static int via_pre_reset(struct ata_link *link, unsigned long deadline)
669a5db4	199	{
cc0680a5	200	struct ata_port *ap = link->ap;
669a5db4 JG	201	const struct via_isa_bridge *config = ap->host->private_data;
	202
	203	if (!(config->flags & VIA_NO_ENABLES)) {
	204	static const struct pci_bits via_enable_bits[] = {
	205	{ 0x40, 1, 0x02, 0x02 },
	206	{ 0x40, 1, 0x01, 0x01 }
	207	};
669a5db4	208	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
c961922b AC	209	if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
c961922b AC	210	return -ENOENT;
669a5db4	211	}
d4b2bab4	212
cc0680a5	213	return ata_std_prereset(link, deadline);
669a5db4 JG	214	}
	215
	216
	217	/**
	218	* via_error_handler - reset for VIA chips
	219	* @ap: ATA port
	220	*
	221	* Handle the reset callback for the later chips with cable detect
	222	*/
	223
	224	static void via_error_handler(struct ata_port *ap)
	225	{
	226	ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
	227	}
	228
	229	/**
	230	* via_do_set_mode - set initial PIO mode data
	231	* @ap: ATA interface
	232	* @adev: ATA device
	233	* @mode: ATA mode being programmed
	234	* @tdiv: Clocks per PCI clock
	235	* @set_ast: Set to program address setup
	236	* @udma_type: UDMA mode/format of registers
	237	*
	238	* Program the VIA registers for DMA and PIO modes. Uses the ata timing
	239	* support in order to compute modes.
	240	*
	241	* FIXME: Hotplug will require we serialize multiple mode changes
	242	* on the two channels.
	243	*/
	244
	245	static void via_do_set_mode(struct ata_port ap, struct ata_device adev, int mode, int tdiv, int set_ast, int udma_type)
	246	{
	247	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	248	struct ata_device *peer = ata_dev_pair(adev);
	249	struct ata_timing t, p;
	250	static int via_clock = 33333; /* Bus clock in kHZ - ought to be tunable one day */
	251	unsigned long T = 1000000000 / via_clock;
	252	unsigned long UT = T/tdiv;
	253	int ut;
	254	int offset = 3 - (2*ap->port_no) - adev->devno;
	255
669a5db4 JG	256	/* Calculate the timing values we require */
	257	ata_timing_compute(adev, mode, &t, T, UT);
	258
	259	/* We share 8bit timing so we must merge the constraints */
	260	if (peer) {
	261	if (peer->pio_mode) {
	262	ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
	263	ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
	264	}
	265	}
	266
	267	/* Address setup is programmable but breaks on UDMA133 setups */
	268	if (set_ast) {
	269	u8 setup; /* 2 bits per drive */
	270	int shift = 2 * offset;
	271
	272	pci_read_config_byte(pdev, 0x4C, &setup);
	273	setup &= ~(3 << shift);
	274	setup \|= FIT(t.setup, 1, 4) << shift; /* 1,4 or 1,4 - 1 FIXME */
	275	pci_write_config_byte(pdev, 0x4C, setup);
	276	}
	277
	278	/* Load the PIO mode bits */
	279	pci_write_config_byte(pdev, 0x4F - ap->port_no,
	280	((FIT(t.act8b, 1, 16) - 1) << 4) \| (FIT(t.rec8b, 1, 16) - 1));
	281	pci_write_config_byte(pdev, 0x48 + offset,
	282	((FIT(t.active, 1, 16) - 1) << 4) \| (FIT(t.recover, 1, 16) - 1));
	283
	284	/* Load the UDMA bits according to type */
	285	switch(udma_type) {
	286	default:
	287	/* BUG() ? */
	288	/* fall through */
	289	case 33:
	290	ut = t.udma ? (0xe0 \| (FIT(t.udma, 2, 5) - 2)) : 0x03;
	291	break;
	292	case 66:
	293	ut = t.udma ? (0xe8 \| (FIT(t.udma, 2, 9) - 2)) : 0x0f;
	294	break;
	295	case 100:
	296	ut = t.udma ? (0xe0 \| (FIT(t.udma, 2, 9) - 2)) : 0x07;
	297	break;
	298	case 133:
	299	ut = t.udma ? (0xe0 \| (FIT(t.udma, 2, 9) - 2)) : 0x07;
	300	break;
	301	}
08ebd43d	302
669a5db4	303	/* Set UDMA unless device is not UDMA capable */
943547ab	304	if (udma_type && t.udma) {
08ebd43d LR	305	u8 cable80_status;
	306
	307	/* Get 80-wire cable detection bit */
	308	pci_read_config_byte(pdev, 0x50 + offset, &cable80_status);
	309	cable80_status &= 0x10;
	310
	311	pci_write_config_byte(pdev, 0x50 + offset, ut \| cable80_status);
	312	}
669a5db4 JG	313	}
	314
	315	static void via_set_piomode(struct ata_port ap, struct ata_device adev)
	316	{
	317	const struct via_isa_bridge *config = ap->host->private_data;
	318	int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
	319	int mode = config->flags & VIA_UDMA;
	320	static u8 tclock[5] = { 1, 1, 2, 3, 4 };
	321	static u8 udma[5] = { 0, 33, 66, 100, 133 };
	322
	323	via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
	324	}
	325
	326	static void via_set_dmamode(struct ata_port ap, struct ata_device adev)
	327	{
	328	const struct via_isa_bridge *config = ap->host->private_data;
	329	int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
	330	int mode = config->flags & VIA_UDMA;
	331	static u8 tclock[5] = { 1, 1, 2, 3, 4 };
	332	static u8 udma[5] = { 0, 33, 66, 100, 133 };
	333
	334	via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
	335	}
	336
	337	static struct scsi_host_template via_sht = {
68d1d07b	338	ATA_BMDMA_SHT(DRV_NAME),
669a5db4 JG	339	};
	340
	341	static struct ata_port_operations via_port_ops = {
029cfd6b TH	342	.inherits = &ata_bmdma_port_ops,
029cfd6b TH	343	.cable_detect = via_cable_detect,
669a5db4 JG	344	.set_piomode = via_set_piomode,
669a5db4 JG	345	.set_dmamode = via_set_dmamode,
669a5db4	346	.error_handler = via_error_handler,
669a5db4 JG	347	};
	348
	349	static struct ata_port_operations via_port_ops_noirq = {
029cfd6b	350	.inherits = &via_port_ops,
0d5ff566	351	.data_xfer = ata_data_xfer_noirq,
669a5db4 JG	352	};
669a5db4 JG	353
627d2d32 A	354	/**
	355	* via_config_fifo - set up the FIFO
	356	* @pdev: PCI device
	357	* @flags: configuration flags
	358	*
3a4fa0a2	359	* Set the FIFO properties for this device if necessary. Used both on
627d2d32 A	360	* set up and on and the resume path
	361	*/
	362
	363	static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
	364	{
	365	u8 enable;
f20b16ff	366
627d2d32 A	367	/* 0x40 low bits indicate enabled channels */
	368	pci_read_config_byte(pdev, 0x40 , &enable);
	369	enable &= 3;
f20b16ff	370
627d2d32	371	if (flags & VIA_SET_FIFO) {
73720861	372	static const u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
627d2d32 A	373	u8 fifo;
	374
	375	pci_read_config_byte(pdev, 0x43, &fifo);
	376
	377	/* Clear PREQ# until DDACK# for errata */
	378	if (flags & VIA_BAD_PREQ)
	379	fifo &= 0x7F;
	380	else
	381	fifo &= 0x9f;
	382	/* Turn on FIFO for enabled channels */
	383	fifo \|= fifo_setting[enable];
	384	pci_write_config_byte(pdev, 0x43, fifo);
	385	}
	386	}
	387
669a5db4 JG	388	/**
669a5db4 JG	389	* via_init_one - discovery callback
627d2d32	390	* @pdev: PCI device
669a5db4 JG	391	* @id: PCI table info
	392	*
	393	* A VIA IDE interface has been discovered. Figure out what revision
	394	* and perform configuration work before handing it to the ATA layer
	395	*/
	396
	397	static int via_init_one(struct pci_dev pdev, const struct pci_device_id id)
	398	{
	399	/* Early VIA without UDMA support */
1626aeb8	400	static const struct ata_port_info via_mwdma_info = {
669a5db4	401	.sht = &via_sht,
464cf177	402	.flags = ATA_FLAG_SLAVE_POSS,
669a5db4 JG	403	.pio_mask = 0x1f,
	404	.mwdma_mask = 0x07,
	405	.port_ops = &via_port_ops
	406	};
	407	/* Ditto with IRQ masking required */
1626aeb8	408	static const struct ata_port_info via_mwdma_info_borked = {
669a5db4	409	.sht = &via_sht,
464cf177	410	.flags = ATA_FLAG_SLAVE_POSS,
669a5db4 JG	411	.pio_mask = 0x1f,
	412	.mwdma_mask = 0x07,
	413	.port_ops = &via_port_ops_noirq,
	414	};
	415	/* VIA UDMA 33 devices (and borked 66) */
1626aeb8	416	static const struct ata_port_info via_udma33_info = {
669a5db4	417	.sht = &via_sht,
464cf177	418	.flags = ATA_FLAG_SLAVE_POSS,
669a5db4 JG	419	.pio_mask = 0x1f,
669a5db4 JG	420	.mwdma_mask = 0x07,
bf6263a8	421	.udma_mask = ATA_UDMA2,
669a5db4 JG	422	.port_ops = &via_port_ops
	423	};
	424	/* VIA UDMA 66 devices */
1626aeb8	425	static const struct ata_port_info via_udma66_info = {
669a5db4	426	.sht = &via_sht,
464cf177	427	.flags = ATA_FLAG_SLAVE_POSS,
669a5db4 JG	428	.pio_mask = 0x1f,
669a5db4 JG	429	.mwdma_mask = 0x07,
bf6263a8	430	.udma_mask = ATA_UDMA4,
669a5db4 JG	431	.port_ops = &via_port_ops
	432	};
	433	/* VIA UDMA 100 devices */
1626aeb8	434	static const struct ata_port_info via_udma100_info = {
669a5db4	435	.sht = &via_sht,
464cf177	436	.flags = ATA_FLAG_SLAVE_POSS,
669a5db4 JG	437	.pio_mask = 0x1f,
669a5db4 JG	438	.mwdma_mask = 0x07,
bf6263a8	439	.udma_mask = ATA_UDMA5,
669a5db4 JG	440	.port_ops = &via_port_ops
	441	};
	442	/* UDMA133 with bad AST (All current 133) */
1626aeb8	443	static const struct ata_port_info via_udma133_info = {
669a5db4	444	.sht = &via_sht,
464cf177	445	.flags = ATA_FLAG_SLAVE_POSS,
669a5db4 JG	446	.pio_mask = 0x1f,
669a5db4 JG	447	.mwdma_mask = 0x07,
bf6263a8	448	.udma_mask = ATA_UDMA6, /* FIXME: should check north bridge */
669a5db4 JG	449	.port_ops = &via_port_ops
669a5db4 JG	450	};
1626aeb8 TH	451	struct ata_port_info type;
1626aeb8 TH	452	const struct ata_port_info *ppi[] = { &type, NULL };
669a5db4 JG	453	struct pci_dev *isa = NULL;
	454	const struct via_isa_bridge *config;
	455	static int printed_version;
669a5db4 JG	456	u8 enable;
669a5db4 JG	457	u32 timing;
f08048e9	458	int rc;
669a5db4 JG	459
	460	if (!printed_version++)
	461	dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
	462
f08048e9 TH	463	rc = pcim_enable_device(pdev);
	464	if (rc)
	465	return rc;
	466
669a5db4 JG	467	/* To find out how the IDE will behave and what features we
	468	actually have to look at the bridge not the IDE controller */
	469	for (config = via_isa_bridges; config->id; config++)
	470	if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
	471	!!(config->flags & VIA_BAD_ID),
	472	config->id, NULL))) {
	473
44c10138 AK	474	if (isa->revision >= config->rev_min &&
44c10138 AK	475	isa->revision <= config->rev_max)
669a5db4 JG	476	break;
	477	pci_dev_put(isa);
	478	}
	479
	480	if (!config->id) {
	481	printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
	482	return -ENODEV;
	483	}
	484	pci_dev_put(isa);
	485
	486	/* 0x40 low bits indicate enabled channels */
	487	pci_read_config_byte(pdev, 0x40 , &enable);
	488	enable &= 3;
	489	if (enable == 0) {
	490	return -ENODEV;
	491	}
	492
	493	/* Initialise the FIFO for the enabled channels. */
627d2d32	494	via_config_fifo(pdev, config->flags);
f20b16ff	495
669a5db4 JG	496	/* Clock set up */
	497	switch(config->flags & VIA_UDMA) {
	498	case VIA_UDMA_NONE:
	499	if (config->flags & VIA_NO_UNMASK)
1626aeb8	500	type = via_mwdma_info_borked;
669a5db4	501	else
1626aeb8	502	type = via_mwdma_info;
669a5db4 JG	503	break;
669a5db4 JG	504	case VIA_UDMA_33:
1626aeb8	505	type = via_udma33_info;
669a5db4 JG	506	break;
669a5db4 JG	507	case VIA_UDMA_66:
1626aeb8	508	type = via_udma66_info;
669a5db4 JG	509	/* The 66 MHz devices require we enable the clock */
	510	pci_read_config_dword(pdev, 0x50, &timing);
	511	timing \|= 0x80008;
	512	pci_write_config_dword(pdev, 0x50, timing);
	513	break;
	514	case VIA_UDMA_100:
1626aeb8	515	type = via_udma100_info;
669a5db4 JG	516	break;
669a5db4 JG	517	case VIA_UDMA_133:
1626aeb8	518	type = via_udma133_info;
669a5db4 JG	519	break;
	520	default:
	521	WARN_ON(1);
	522	return -ENODEV;
	523	}
	524
	525	if (config->flags & VIA_BAD_CLK66) {
	526	/* Disable the 66MHz clock on problem devices */
	527	pci_read_config_dword(pdev, 0x50, &timing);
	528	timing &= ~0x80008;
	529	pci_write_config_dword(pdev, 0x50, timing);
	530	}
	531
	532	/* We have established the device type, now fire it up */
1626aeb8	533	type.private_data = (void *)config;
669a5db4	534
1626aeb8	535	return ata_pci_init_one(pdev, ppi);
669a5db4 JG	536	}
669a5db4 JG	537
438ac6d5	538	#ifdef CONFIG_PM
627d2d32 A	539	/**
	540	* via_reinit_one - reinit after resume
	541	* @pdev; PCI device
	542	*
	543	* Called when the VIA PATA device is resumed. We must then
	544	* reconfigure the fifo and other setup we may have altered. In
	545	* addition the kernel needs to have the resume methods on PCI
	546	* quirk supported.
	547	*/
	548
	549	static int via_reinit_one(struct pci_dev *pdev)
	550	{
	551	u32 timing;
	552	struct ata_host *host = dev_get_drvdata(&pdev->dev);
	553	const struct via_isa_bridge *config = host->private_data;
f08048e9 TH	554	int rc;
	555
	556	rc = ata_pci_device_do_resume(pdev);
	557	if (rc)
	558	return rc;
f20b16ff	559
627d2d32 A	560	via_config_fifo(pdev, config->flags);
	561
	562	if ((config->flags & VIA_UDMA) == VIA_UDMA_66) {
	563	/* The 66 MHz devices require we enable the clock */
	564	pci_read_config_dword(pdev, 0x50, &timing);
	565	timing \|= 0x80008;
	566	pci_write_config_dword(pdev, 0x50, timing);
	567	}
	568	if (config->flags & VIA_BAD_CLK66) {
	569	/* Disable the 66MHz clock on problem devices */
	570	pci_read_config_dword(pdev, 0x50, &timing);
	571	timing &= ~0x80008;
	572	pci_write_config_dword(pdev, 0x50, timing);
	573	}
f08048e9 TH	574
	575	ata_host_resume(host);
	576	return 0;
627d2d32	577	}
438ac6d5	578	#endif
627d2d32	579
669a5db4	580	static const struct pci_device_id via[] = {
52df0ee0 JG	581	{ PCI_VDEVICE(VIA, 0x0571), },
	582	{ PCI_VDEVICE(VIA, 0x0581), },
	583	{ PCI_VDEVICE(VIA, 0x1571), },
	584	{ PCI_VDEVICE(VIA, 0x3164), },
	585	{ PCI_VDEVICE(VIA, 0x5324), },
2d2744fc JG	586
2d2744fc JG	587	{ },
669a5db4 JG	588	};
	589
	590	static struct pci_driver via_pci_driver = {
2d2744fc	591	.name = DRV_NAME,
669a5db4 JG	592	.id_table = via,
669a5db4 JG	593	.probe = via_init_one,
627d2d32	594	.remove = ata_pci_remove_one,
438ac6d5	595	#ifdef CONFIG_PM
627d2d32 A	596	.suspend = ata_pci_device_suspend,
627d2d32 A	597	.resume = via_reinit_one,
438ac6d5	598	#endif
669a5db4 JG	599	};
	600
	601	static int __init via_init(void)
	602	{
	603	return pci_register_driver(&via_pci_driver);
	604	}
	605
669a5db4 JG	606	static void __exit via_exit(void)
	607	{
	608	pci_unregister_driver(&via_pci_driver);
	609	}
	610
669a5db4 JG	611	MODULE_AUTHOR("Alan Cox");
	612	MODULE_DESCRIPTION("low-level driver for VIA PATA");
	613	MODULE_LICENSE("GPL");
	614	MODULE_DEVICE_TABLE(pci, via);
	615	MODULE_VERSION(DRV_VERSION);
	616
	617	module_init(via_init);
	618	module_exit(via_exit);