Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 690 insertions, 0 deletions

diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c
new file mode 100644
index 000000000000..ce19728aa8a4
--- /dev/null
+++ b/drivers/scsi/ata_piix.c
@@ -0,0 +1,690 @@
+/*
+
+    ata_piix.c - Intel PATA/SATA controllers
+
+    Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+    		    Please ALWAYS copy linux-ide@vger.kernel.org
+		    on emails.
+
+
+	Copyright 2003-2004 Red Hat Inc
+	Copyright 2003-2004 Jeff Garzik
+
+
+	Copyright header from piix.c:
+
+    Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
+    Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
+    Copyright (C) 2003 Red Hat Inc <alan@redhat.com>
+
+    May be copied or modified under the terms of the GNU General Public License
+
+ */
+
+#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.h"
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"ata_piix"
+#define DRV_VERSION	"1.03"
+
+enum {
+	PIIX_IOCFG		= 0x54, /* IDE I/O configuration register */
+	ICH5_PMR		= 0x90, /* port mapping register */
+	ICH5_PCS		= 0x92,	/* port control and status */
+
+	PIIX_FLAG_AHCI		= (1 << 28), /* AHCI possible */
+	PIIX_FLAG_CHECKINTR	= (1 << 29), /* make sure PCI INTx enabled */
+	PIIX_FLAG_COMBINED	= (1 << 30), /* combined mode possible */
+
+	/* combined mode.  if set, PATA is channel 0.
+	 * if clear, PATA is channel 1.
+	 */
+	PIIX_COMB_PATA_P0	= (1 << 1),
+	PIIX_COMB		= (1 << 2), /* combined mode enabled? */
+
+	PIIX_PORT_PRESENT	= (1 << 0),
+	PIIX_PORT_ENABLED	= (1 << 4),
+
+	PIIX_80C_PRI		= (1 << 5) | (1 << 4),
+	PIIX_80C_SEC		= (1 << 7) | (1 << 6),
+
+	ich5_pata		= 0,
+	ich5_sata		= 1,
+	piix4_pata		= 2,
+	ich6_sata		= 3,
+	ich6_sata_rm		= 4,
+	ich7_sata		= 5,
+};
+
+static int piix_init_one (struct pci_dev *pdev,
+				    const struct pci_device_id *ent);
+
+static void piix_pata_phy_reset(struct ata_port *ap);
+static void piix_sata_phy_reset(struct ata_port *ap);
+static void piix_set_piomode (struct ata_port *ap, struct ata_device *adev);
+static void piix_set_dmamode (struct ata_port *ap, struct ata_device *adev);
+
+static unsigned int in_module_init = 1;
+
+static struct pci_device_id piix_pci_tbl[] = {
+#ifdef ATA_ENABLE_PATA
+	{ 0x8086, 0x7111, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix4_pata },
+	{ 0x8086, 0x24db, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_pata },
+	{ 0x8086, 0x25a2, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_pata },
+#endif
+
+	/* NOTE: The following PCI ids must be kept in sync with the
+	 * list in drivers/pci/quirks.c.
+	 */
+
+	{ 0x8086, 0x24d1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },
+	{ 0x8086, 0x24df, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },
+	{ 0x8086, 0x25a3, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },
+	{ 0x8086, 0x25b0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },
+	{ 0x8086, 0x2651, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata },
+	{ 0x8086, 0x2652, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_rm },
+	{ 0x8086, 0x2653, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_rm },
+	{ 0x8086, 0x27c0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich7_sata },
+	{ 0x8086, 0x27c4, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich7_sata },
+
+	{ }	/* terminate list */
+};
+
+static struct pci_driver piix_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= piix_pci_tbl,
+	.probe			= piix_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static Scsi_Host_Template piix_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.eh_strategy_handler	= ata_scsi_error,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.max_sectors		= ATA_MAX_SECTORS,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.bios_param		= ata_std_bios_param,
+	.ordered_flush		= 1,
+};
+
+static struct ata_port_operations piix_pata_ops = {
+	.port_disable		= ata_port_disable,
+	.set_piomode		= piix_set_piomode,
+	.set_dmamode		= piix_set_dmamode,
+
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+
+	.phy_reset		= piix_pata_phy_reset,
+
+	.bmdma_setup		= ata_bmdma_setup,
+	.bmdma_start		= ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+
+	.eng_timeout		= ata_eng_timeout,
+
+	.irq_handler		= ata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+};
+
+static struct ata_port_operations piix_sata_ops = {
+	.port_disable		= ata_port_disable,
+
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+
+	.phy_reset		= piix_sata_phy_reset,
+
+	.bmdma_setup		= ata_bmdma_setup,
+	.bmdma_start		= ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+
+	.eng_timeout		= ata_eng_timeout,
+
+	.irq_handler		= ata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+};
+
+static struct ata_port_info piix_port_info[] = {
+	/* ich5_pata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST |
+				  PIIX_FLAG_CHECKINTR,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+#if 0
+		.mwdma_mask	= 0x06, /* mwdma1-2 */
+#else
+		.mwdma_mask	= 0x00, /* mwdma broken */
+#endif
+		.udma_mask	= 0x3f, /* udma0-5 */
+		.port_ops	= &piix_pata_ops,
+	},
+
+	/* ich5_sata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_SRST |
+				  PIIX_FLAG_COMBINED | PIIX_FLAG_CHECKINTR,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+
+	/* piix4_pata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+#if 0
+		.mwdma_mask	= 0x06, /* mwdma1-2 */
+#else
+		.mwdma_mask	= 0x00, /* mwdma broken */
+#endif
+		.udma_mask	= ATA_UDMA_MASK_40C,
+		.port_ops	= &piix_pata_ops,
+	},
+
+	/* ich6_sata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_SRST |
+				  PIIX_FLAG_COMBINED | PIIX_FLAG_CHECKINTR |
+				  ATA_FLAG_SLAVE_POSS,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+
+	/* ich6_sata_rm */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_SRST |
+				  PIIX_FLAG_COMBINED | PIIX_FLAG_CHECKINTR |
+				  ATA_FLAG_SLAVE_POSS | PIIX_FLAG_AHCI,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+
+	/* ich7_sata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_SRST |
+				  PIIX_FLAG_COMBINED | PIIX_FLAG_CHECKINTR |
+				  ATA_FLAG_SLAVE_POSS | PIIX_FLAG_AHCI,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+};
+
+static struct pci_bits piix_enable_bits[] = {
+	{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
+	{ 0x43U, 1U, 0x80UL, 0x80UL },	/* port 1 */
+};
+
+MODULE_AUTHOR("Andre Hedrick, Alan Cox, Andrzej Krzysztofowicz, Jeff Garzik");
+MODULE_DESCRIPTION("SCSI low-level driver for Intel PIIX/ICH ATA controllers");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, piix_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+/**
+ *	piix_pata_cbl_detect - Probe host controller cable detect info
+ *	@ap: Port for which cable detect info is desired
+ *
+ *	Read 80c cable indicator from ATA PCI device's PCI config
+ *	register.  This register is normally set by firmware (BIOS).
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+static void piix_pata_cbl_detect(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	u8 tmp, mask;
+
+	/* no 80c support in host controller? */
+	if ((ap->udma_mask & ~ATA_UDMA_MASK_40C) == 0)
+		goto cbl40;
+
+	/* check BIOS cable detect results */
+	mask = ap->hard_port_no == 0 ? PIIX_80C_PRI : PIIX_80C_SEC;
+	pci_read_config_byte(pdev, PIIX_IOCFG, &tmp);
+	if ((tmp & mask) == 0)
+		goto cbl40;
+
+	ap->cbl = ATA_CBL_PATA80;
+	return;
+
+cbl40:
+	ap->cbl = ATA_CBL_PATA40;
+	ap->udma_mask &= ATA_UDMA_MASK_40C;
+}
+
+/**
+ *	piix_pata_phy_reset - Probe specified port on PATA host controller
+ *	@ap: Port to probe
+ *
+ *	Probe PATA phy.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void piix_pata_phy_reset(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+
+	if (!pci_test_config_bits(pdev, &piix_enable_bits[ap->hard_port_no])) {
+		ata_port_disable(ap);
+		printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
+		return;
+	}
+
+	piix_pata_cbl_detect(ap);
+
+	ata_port_probe(ap);
+
+	ata_bus_reset(ap);
+}
+
+/**
+ *	piix_sata_probe - Probe PCI device for present SATA devices
+ *	@ap: Port associated with the PCI device we wish to probe
+ *
+ *	Reads SATA PCI device's PCI config register Port Configuration
+ *	and Status (PCS) to determine port and device availability.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ *
+ *	RETURNS:
+ *	Non-zero if device detected, zero otherwise.
+ */
+static int piix_sata_probe (struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	int combined = (ap->flags & ATA_FLAG_SLAVE_POSS);
+	int orig_mask, mask, i;
+	u8 pcs;
+
+	mask = (PIIX_PORT_PRESENT << ap->hard_port_no) |
+	       (PIIX_PORT_ENABLED << ap->hard_port_no);
+
+	pci_read_config_byte(pdev, ICH5_PCS, &pcs);
+	orig_mask = (int) pcs & 0xff;
+
+	/* TODO: this is vaguely wrong for ICH6 combined mode,
+	 * where only two of the four SATA ports are mapped
+	 * onto a single ATA channel.  It is also vaguely inaccurate
+	 * for ICH5, which has only two ports.  However, this is ok,
+	 * as further device presence detection code will handle
+	 * any false positives produced here.
+	 */
+
+	for (i = 0; i < 4; i++) {
+		mask = (PIIX_PORT_PRESENT << i) | (PIIX_PORT_ENABLED << i);
+
+		if ((orig_mask & mask) == mask)
+			if (combined || (i == ap->hard_port_no))
+				return 1;
+	}
+
+	return 0;
+}
+
+/**
+ *	piix_sata_phy_reset - Probe specified port on SATA host controller
+ *	@ap: Port to probe
+ *
+ *	Probe SATA phy.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void piix_sata_phy_reset(struct ata_port *ap)
+{
+	if (!piix_sata_probe(ap)) {
+		ata_port_disable(ap);
+		printk(KERN_INFO "ata%u: SATA port has no device.\n", ap->id);
+		return;
+	}
+
+	ap->cbl = ATA_CBL_SATA;
+
+	ata_port_probe(ap);
+
+	ata_bus_reset(ap);
+}
+
+/**
+ *	piix_set_piomode - Initialize host controller PATA PIO timings
+ *	@ap: Port whose timings we are configuring
+ *	@adev: um
+ *	@pio: PIO mode, 0 - 4
+ *
+ *	Set PIO mode for device, in host controller PCI config space.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void piix_set_piomode (struct ata_port *ap, struct ata_device *adev)
+{
+	unsigned int pio	= adev->pio_mode - XFER_PIO_0;
+	struct pci_dev *dev	= to_pci_dev(ap->host_set->dev);
+	unsigned int is_slave	= (adev->devno != 0);
+	unsigned int master_port= ap->hard_port_no ? 0x42 : 0x40;
+	unsigned int slave_port	= 0x44;
+	u16 master_data;
+	u8 slave_data;
+
+	static const	 /* ISP  RTC */
+	u8 timings[][2]	= { { 0, 0 },
+			    { 0, 0 },
+			    { 1, 0 },
+			    { 2, 1 },
+			    { 2, 3 }, };
+
+	pci_read_config_word(dev, master_port, &master_data);
+	if (is_slave) {
+		master_data |= 0x4000;
+		/* enable PPE, IE and TIME */
+		master_data |= 0x0070;
+		pci_read_config_byte(dev, slave_port, &slave_data);
+		slave_data &= (ap->hard_port_no ? 0x0f : 0xf0);
+		slave_data |=
+			(timings[pio][0] << 2) |
+			(timings[pio][1] << (ap->hard_port_no ? 4 : 0));
+	} else {
+		master_data &= 0xccf8;
+		/* enable PPE, IE and TIME */
+		master_data |= 0x0007;
+		master_data |=
+			(timings[pio][0] << 12) |
+			(timings[pio][1] << 8);
+	}
+	pci_write_config_word(dev, master_port, master_data);
+	if (is_slave)
+		pci_write_config_byte(dev, slave_port, slave_data);
+}
+
+/**
+ *	piix_set_dmamode - Initialize host controller PATA PIO timings
+ *	@ap: Port whose timings we are configuring
+ *	@adev: um
+ *	@udma: udma mode, 0 - 6
+ *
+ *	Set UDMA mode for device, in host controller PCI config space.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void piix_set_dmamode (struct ata_port *ap, struct ata_device *adev)
+{
+	unsigned int udma	= adev->dma_mode; /* FIXME: MWDMA too */
+	struct pci_dev *dev	= to_pci_dev(ap->host_set->dev);
+	u8 maslave		= ap->hard_port_no ? 0x42 : 0x40;
+	u8 speed		= udma;
+	unsigned int drive_dn	= (ap->hard_port_no ? 2 : 0) + adev->devno;
+	int a_speed		= 3 << (drive_dn * 4);
+	int u_flag		= 1 << drive_dn;
+	int v_flag		= 0x01 << drive_dn;
+	int w_flag		= 0x10 << drive_dn;
+	int u_speed		= 0;
+	int			sitre;
+	u16			reg4042, reg4a;
+	u8			reg48, reg54, reg55;
+
+	pci_read_config_word(dev, maslave, &reg4042);
+	DPRINTK("reg4042 = 0x%04x\n", reg4042);
+	sitre = (reg4042 & 0x4000) ? 1 : 0;
+	pci_read_config_byte(dev, 0x48, &reg48);
+	pci_read_config_word(dev, 0x4a, &reg4a);
+	pci_read_config_byte(dev, 0x54, &reg54);
+	pci_read_config_byte(dev, 0x55, &reg55);
+
+	switch(speed) {
+		case XFER_UDMA_4:
+		case XFER_UDMA_2:	u_speed = 2 << (drive_dn * 4); break;
+		case XFER_UDMA_6:
+		case XFER_UDMA_5:
+		case XFER_UDMA_3:
+		case XFER_UDMA_1:	u_speed = 1 << (drive_dn * 4); break;
+		case XFER_UDMA_0:	u_speed = 0 << (drive_dn * 4); break;
+		case XFER_MW_DMA_2:
+		case XFER_MW_DMA_1:	break;
+		default:
+			BUG();
+			return;
+	}
+
+	if (speed >= XFER_UDMA_0) {
+		if (!(reg48 & u_flag))
+			pci_write_config_byte(dev, 0x48, reg48 | u_flag);
+		if (speed == XFER_UDMA_5) {
+			pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
+		} else {
+			pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
+		}
+		if ((reg4a & a_speed) != u_speed)
+			pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
+		if (speed > XFER_UDMA_2) {
+			if (!(reg54 & v_flag))
+				pci_write_config_byte(dev, 0x54, reg54 | v_flag);
+		} else
+			pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
+	} else {
+		if (reg48 & u_flag)
+			pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
+		if (reg4a & a_speed)
+			pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
+		if (reg54 & v_flag)
+			pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
+		if (reg55 & w_flag)
+			pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
+	}
+}
+
+/* move to PCI layer, integrate w/ MSI stuff */
+static void pci_enable_intx(struct pci_dev *pdev)
+{
+	u16 pci_command;
+
+	pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
+	if (pci_command & PCI_COMMAND_INTX_DISABLE) {
+		pci_command &= ~PCI_COMMAND_INTX_DISABLE;
+		pci_write_config_word(pdev, PCI_COMMAND, pci_command);
+	}
+}
+
+#define AHCI_PCI_BAR 5
+#define AHCI_GLOBAL_CTL 0x04
+#define AHCI_ENABLE (1 << 31)
+static int piix_disable_ahci(struct pci_dev *pdev)
+{
+	void *mmio;
+	unsigned long addr;
+	u32 tmp;
+	int rc = 0;
+
+	/* BUG: pci_enable_device has not yet been called.  This
+	 * works because this device is usually set up by BIOS.
+	 */
+
+	addr = pci_resource_start(pdev, AHCI_PCI_BAR);
+	if (!addr || !pci_resource_len(pdev, AHCI_PCI_BAR))
+		return 0;
+	
+	mmio = ioremap(addr, 64);
+	if (!mmio)
+		return -ENOMEM;
+	
+	tmp = readl(mmio + AHCI_GLOBAL_CTL);
+	if (tmp & AHCI_ENABLE) {
+		tmp &= ~AHCI_ENABLE;
+		writel(tmp, mmio + AHCI_GLOBAL_CTL);
+
+		tmp = readl(mmio + AHCI_GLOBAL_CTL);
+		if (tmp & AHCI_ENABLE)
+			rc = -EIO;
+	}
+	
+	iounmap(mmio);
+	return rc;
+}
+
+/**
+ *	piix_init_one - Register PIIX ATA PCI device with kernel services
+ *	@pdev: PCI device to register
+ *	@ent: Entry in piix_pci_tbl matching with @pdev
+ *
+ *	Called from kernel PCI layer.  We probe for combined mode (sigh),
+ *	and then hand over control to libata, for it to do the rest.
+ *
+ *	LOCKING:
+ *	Inherited from PCI layer (may sleep).
+ *
+ *	RETURNS:
+ *	Zero on success, or -ERRNO value.
+ */
+
+static int piix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_port_info *port_info[2];
+	unsigned int combined = 0, n_ports = 1;
+	unsigned int pata_chan = 0, sata_chan = 0;
+
+	if (!printed_version++)
+		printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
+
+	/* no hotplugging support (FIXME) */
+	if (!in_module_init)
+		return -ENODEV;
+
+	port_info[0] = &piix_port_info[ent->driver_data];
+	port_info[1] = NULL;
+
+	if (port_info[0]->host_flags & PIIX_FLAG_AHCI) {
+		int rc = piix_disable_ahci(pdev);
+		if (rc)
+			return rc;
+	}
+
+	if (port_info[0]->host_flags & PIIX_FLAG_COMBINED) {
+		u8 tmp;
+		pci_read_config_byte(pdev, ICH5_PMR, &tmp);
+
+		if (tmp & PIIX_COMB) {
+			combined = 1;
+			if (tmp & PIIX_COMB_PATA_P0)
+				sata_chan = 1;
+			else
+				pata_chan = 1;
+		}
+	}
+
+	/* On ICH5, some BIOSen disable the interrupt using the
+	 * PCI_COMMAND_INTX_DISABLE bit added in PCI 2.3.
+	 * On ICH6, this bit has the same effect, but only when
+	 * MSI is disabled (and it is disabled, as we don't use
+	 * message-signalled interrupts currently).
+	 */
+	if (port_info[0]->host_flags & PIIX_FLAG_CHECKINTR)
+		pci_enable_intx(pdev);
+
+	if (combined) {
+		port_info[sata_chan] = &piix_port_info[ent->driver_data];
+		port_info[sata_chan]->host_flags |= ATA_FLAG_SLAVE_POSS;
+		port_info[pata_chan] = &piix_port_info[ich5_pata];
+		n_ports++;
+
+		printk(KERN_WARNING DRV_NAME ": combined mode detected\n");
+	}
+
+	return ata_pci_init_one(pdev, port_info, n_ports);
+}
+
+/**
+ *	piix_init -
+ *
+ *	LOCKING:
+ *
+ *	RETURNS:
+ *
+ */
+
+static int __init piix_init(void)
+{
+	int rc;
+
+	DPRINTK("pci_module_init\n");
+	rc = pci_module_init(&piix_pci_driver);
+	if (rc)
+		return rc;
+
+	in_module_init = 0;
+
+	DPRINTK("done\n");
+	return 0;
+}
+
+/**
+ *	piix_exit -
+ *
+ *	LOCKING:
+ *
+ */
+
+static void __exit piix_exit(void)
+{
+	pci_unregister_driver(&piix_pci_driver);
+}
+
+module_init(piix_init);
+module_exit(piix_exit);
+