drivers/scsi/sata_via.c - maze/linux - Git at Google

 /*
  *  sata_via.c - VIA Serial ATA controllers
  *
  *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
  * 		   Please ALWAYS copy linux-ide@vger.kernel.org
  		   on emails.
  *
  *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
  *  Copyright 2003-2004 Jeff Garzik
  *
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2, or (at your option)
  *  any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; see the file COPYING.  If not, write to
  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  *
  *  libata documentation is available via 'make {ps|pdf}docs',
  *  as Documentation/DocBook/libata.*
  *
  *  Hardware documentation available under NDA.
  *
  *
  *  To-do list:
  *  - VT6421 PATA support
  *
  */

 #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 <linux/device.h>
 #include <scsi/scsi_host.h>
 #include <linux/libata.h>
 #include <asm/io.h>

 #define DRV_NAME	"sata_via"
 #define DRV_VERSION	"1.1"

 enum board_ids_enum {
 	vt6420,
 	vt6421,
 };

 enum {
 	SATA_CHAN_ENAB		= 0x40, /* SATA channel enable */
 	SATA_INT_GATE		= 0x41, /* SATA interrupt gating */
 	SATA_NATIVE_MODE	= 0x42, /* Native mode enable */
 	SATA_PATA_SHARING	= 0x49, /* PATA/SATA sharing func ctrl */

 	PORT0			= (1 << 1),
 	PORT1			= (1 << 0),
 	ALL_PORTS		= PORT0 | PORT1,
 	N_PORTS			= 2,

 	NATIVE_MODE_ALL		= (1 << 7) | (1 << 6) | (1 << 5) | (1 << 4),

 	SATA_EXT_PHY		= (1 << 6), /* 0==use PATA, 1==ext phy */
 	SATA_2DEV		= (1 << 5), /* SATA is master/slave */
 };

 static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
 static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg);
 static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);

 static const struct pci_device_id svia_pci_tbl[] = {
 	{ 0x1106, 0x3149, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6420 },
 	{ 0x1106, 0x3249, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6421 },

 	{ }	/* terminate list */
 };

 static struct pci_driver svia_pci_driver = {
 	.name			= DRV_NAME,
 	.id_table		= svia_pci_tbl,
 	.probe			= svia_init_one,
 	.remove			= ata_pci_remove_one,
 };

 static struct scsi_host_template svia_sht = {
 	.module			= THIS_MODULE,
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
 	.eh_timed_out		= ata_scsi_timed_out,
 	.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,
 };

 static const struct ata_port_operations svia_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		= 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,

 	.scr_read		= svia_scr_read,
 	.scr_write		= svia_scr_write,

 	.port_start		= ata_port_start,
 	.port_stop		= ata_port_stop,
 	.host_stop		= ata_host_stop,
 };

 static struct ata_port_info svia_port_info = {
 	.sht		= &svia_sht,
 	.host_flags	= ATA_FLAG_SATA | ATA_FLAG_SRST | ATA_FLAG_NO_LEGACY,
 	.pio_mask	= 0x1f,
 	.mwdma_mask	= 0x07,
 	.udma_mask	= 0x7f,
 	.port_ops	= &svia_sata_ops,
 };

 MODULE_AUTHOR("Jeff Garzik");
 MODULE_DESCRIPTION("SCSI low-level driver for VIA SATA controllers");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, svia_pci_tbl);
 MODULE_VERSION(DRV_VERSION);

 static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg)
 {
 	if (sc_reg > SCR_CONTROL)
 		return 0xffffffffU;
 	return inl(ap->ioaddr.scr_addr + (4 * sc_reg));
 }

 static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
 {
 	if (sc_reg > SCR_CONTROL)
 		return;
 	outl(val, ap->ioaddr.scr_addr + (4 * sc_reg));
 }

 static const unsigned int svia_bar_sizes[] = {
 	8, 4, 8, 4, 16, 256
 };

 static const unsigned int vt6421_bar_sizes[] = {
 	16, 16, 16, 16, 32, 128
 };

 static unsigned long svia_scr_addr(unsigned long addr, unsigned int port)
 {
 	return addr + (port * 128);
 }

 static unsigned long vt6421_scr_addr(unsigned long addr, unsigned int port)
 {
 	return addr + (port * 64);
 }

 static void vt6421_init_addrs(struct ata_probe_ent *probe_ent,
 			      struct pci_dev *pdev,
 			      unsigned int port)
 {
 	unsigned long reg_addr = pci_resource_start(pdev, port);
 	unsigned long bmdma_addr = pci_resource_start(pdev, 4) + (port * 8);
 	unsigned long scr_addr;

 	probe_ent->port[port].cmd_addr = reg_addr;
 	probe_ent->port[port].altstatus_addr =
 	probe_ent->port[port].ctl_addr = (reg_addr + 8) | ATA_PCI_CTL_OFS;
 	probe_ent->port[port].bmdma_addr = bmdma_addr;

 	scr_addr = vt6421_scr_addr(pci_resource_start(pdev, 5), port);
 	probe_ent->port[port].scr_addr = scr_addr;

 	ata_std_ports(&probe_ent->port[port]);
 }

 static struct ata_probe_ent *vt6420_init_probe_ent(struct pci_dev *pdev)
 {
 	struct ata_probe_ent *probe_ent;
 	struct ata_port_info *ppi = &svia_port_info;

 	probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
 	if (!probe_ent)
 		return NULL;

 	probe_ent->port[0].scr_addr =
 		svia_scr_addr(pci_resource_start(pdev, 5), 0);
 	probe_ent->port[1].scr_addr =
 		svia_scr_addr(pci_resource_start(pdev, 5), 1);

 	return probe_ent;
 }

 static struct ata_probe_ent *vt6421_init_probe_ent(struct pci_dev *pdev)
 {
 	struct ata_probe_ent *probe_ent;
 	unsigned int i;

 	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
 	if (!probe_ent)
 		return NULL;

 	memset(probe_ent, 0, sizeof(*probe_ent));
 	probe_ent->dev = pci_dev_to_dev(pdev);
 	INIT_LIST_HEAD(&probe_ent->node);

 	probe_ent->sht		= &svia_sht;
 	probe_ent->host_flags	= ATA_FLAG_SATA | ATA_FLAG_SATA_RESET |
 				  ATA_FLAG_NO_LEGACY;
 	probe_ent->port_ops	= &svia_sata_ops;
 	probe_ent->n_ports	= N_PORTS;
 	probe_ent->irq		= pdev->irq;
 	probe_ent->irq_flags	= SA_SHIRQ;
 	probe_ent->pio_mask	= 0x1f;
 	probe_ent->mwdma_mask	= 0x07;
 	probe_ent->udma_mask	= 0x7f;

 	for (i = 0; i < N_PORTS; i++)
 		vt6421_init_addrs(probe_ent, pdev, i);

 	return probe_ent;
 }

 static void svia_configure(struct pci_dev *pdev)
 {
 	u8 tmp8;

 	pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &tmp8);
 	dev_printk(KERN_INFO, &pdev->dev, "routed to hard irq line %d\n",
 	       (int) (tmp8 & 0xf0) == 0xf0 ? 0 : tmp8 & 0x0f);

 	/* make sure SATA channels are enabled */
 	pci_read_config_byte(pdev, SATA_CHAN_ENAB, &tmp8);
 	if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
 		dev_printk(KERN_DEBUG, &pdev->dev,
 			   "enabling SATA channels (0x%x)\n",
 		           (int) tmp8);
 		tmp8 |= ALL_PORTS;
 		pci_write_config_byte(pdev, SATA_CHAN_ENAB, tmp8);
 	}

 	/* make sure interrupts for each channel sent to us */
 	pci_read_config_byte(pdev, SATA_INT_GATE, &tmp8);
 	if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
 		dev_printk(KERN_DEBUG, &pdev->dev,
 			   "enabling SATA channel interrupts (0x%x)\n",
 		           (int) tmp8);
 		tmp8 |= ALL_PORTS;
 		pci_write_config_byte(pdev, SATA_INT_GATE, tmp8);
 	}

 	/* make sure native mode is enabled */
 	pci_read_config_byte(pdev, SATA_NATIVE_MODE, &tmp8);
 	if ((tmp8 & NATIVE_MODE_ALL) != NATIVE_MODE_ALL) {
 		dev_printk(KERN_DEBUG, &pdev->dev,
 			   "enabling SATA channel native mode (0x%x)\n",
 		           (int) tmp8);
 		tmp8 |= NATIVE_MODE_ALL;
 		pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
 	}
 }

 static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	static int printed_version;
 	unsigned int i;
 	int rc;
 	struct ata_probe_ent *probe_ent;
 	int board_id = (int) ent->driver_data;
 	const int *bar_sizes;
 	int pci_dev_busy = 0;
 	u8 tmp8;

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

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

 	rc = pci_request_regions(pdev, DRV_NAME);
 	if (rc) {
 		pci_dev_busy = 1;
 		goto err_out;
 	}

 	if (board_id == vt6420) {
 		pci_read_config_byte(pdev, SATA_PATA_SHARING, &tmp8);
 		if (tmp8 & SATA_2DEV) {
 			dev_printk(KERN_ERR, &pdev->dev,
 				   "SATA master/slave not supported (0x%x)\n",
 		       		   (int) tmp8);
 			rc = -EIO;
 			goto err_out_regions;
 		}

 		bar_sizes = &svia_bar_sizes[0];
 	} else {
 		bar_sizes = &vt6421_bar_sizes[0];
 	}

 	for (i = 0; i < ARRAY_SIZE(svia_bar_sizes); i++)
 		if ((pci_resource_start(pdev, i) == 0) ||
 		    (pci_resource_len(pdev, i) < bar_sizes[i])) {
 			dev_printk(KERN_ERR, &pdev->dev,
 				   "invalid PCI BAR %u (sz 0x%lx, val 0x%lx)\n",
 				   i,
 			           pci_resource_start(pdev, i),
 			           pci_resource_len(pdev, i));
 			rc = -ENODEV;
 			goto err_out_regions;
 		}

 	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
 	if (rc)
 		goto err_out_regions;
 	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
 	if (rc)
 		goto err_out_regions;

 	if (board_id == vt6420)
 		probe_ent = vt6420_init_probe_ent(pdev);
 	else
 		probe_ent = vt6421_init_probe_ent(pdev);

 	if (!probe_ent) {
 		dev_printk(KERN_ERR, &pdev->dev, "out of memory\n");
 		rc = -ENOMEM;
 		goto err_out_regions;
 	}

 	svia_configure(pdev);

 	pci_set_master(pdev);

 	/* FIXME: check ata_device_add return value */
 	ata_device_add(probe_ent);
 	kfree(probe_ent);

 	return 0;

 err_out_regions:
 	pci_release_regions(pdev);
 err_out:
 	if (!pci_dev_busy)
 		pci_disable_device(pdev);
 	return rc;
 }

 static int __init svia_init(void)
 {
 	return pci_module_init(&svia_pci_driver);
 }

 static void __exit svia_exit(void)
 {
 	pci_unregister_driver(&svia_pci_driver);
 }

 module_init(svia_init);
 module_exit(svia_exit);
	/*
	* sata_via.c - VIA Serial ATA controllers
	*
	* Maintained by: Jeff Garzik <jgarzik@pobox.com>
	* Please ALWAYS copy linux-ide@vger.kernel.org
	on emails.
	*
	* Copyright 2003-2004 Red Hat, Inc. All rights reserved.
	* Copyright 2003-2004 Jeff Garzik
	*
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2, or (at your option)
	* any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; see the file COPYING. If not, write to
	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	*
	* libata documentation is available via 'make {ps\|pdf}docs',
	* as Documentation/DocBook/libata.*
	*
	* Hardware documentation available under NDA.
	*
	*
	* To-do list:
	* - VT6421 PATA support
	*
	*/

	#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 <linux/device.h>
	#include <scsi/scsi_host.h>
	#include <linux/libata.h>
	#include <asm/io.h>

	#define DRV_NAME "sata_via"
	#define DRV_VERSION "1.1"

	enum board_ids_enum {
	vt6420,
	vt6421,
	};

	enum {
	SATA_CHAN_ENAB = 0x40, /* SATA channel enable */
	SATA_INT_GATE = 0x41, /* SATA interrupt gating */
	SATA_NATIVE_MODE = 0x42, /* Native mode enable */
	SATA_PATA_SHARING = 0x49, /* PATA/SATA sharing func ctrl */

	PORT0 = (1 << 1),
	PORT1 = (1 << 0),
	ALL_PORTS = PORT0 \| PORT1,
	N_PORTS = 2,

	NATIVE_MODE_ALL = (1 << 7) \| (1 << 6) \| (1 << 5) \| (1 << 4),

	SATA_EXT_PHY = (1 << 6), /* 0==use PATA, 1==ext phy */
	SATA_2DEV = (1 << 5), /* SATA is master/slave */
	};

	static int svia_init_one (struct pci_dev pdev, const struct pci_device_id ent);
	static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg);
	static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);

	static const struct pci_device_id svia_pci_tbl[] = {
	{ 0x1106, 0x3149, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6420 },
	{ 0x1106, 0x3249, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6421 },

	{ } /* terminate list */
	};

	static struct pci_driver svia_pci_driver = {
	.name = DRV_NAME,
	.id_table = svia_pci_tbl,
	.probe = svia_init_one,
	.remove = ata_pci_remove_one,
	};

	static struct scsi_host_template svia_sht = {
	.module = THIS_MODULE,
	.name = DRV_NAME,
	.ioctl = ata_scsi_ioctl,
	.queuecommand = ata_scsi_queuecmd,
	.eh_timed_out = ata_scsi_timed_out,
	.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,
	};

	static const struct ata_port_operations svia_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 = 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,

	.scr_read = svia_scr_read,
	.scr_write = svia_scr_write,

	.port_start = ata_port_start,
	.port_stop = ata_port_stop,
	.host_stop = ata_host_stop,
	};

	static struct ata_port_info svia_port_info = {
	.sht = &svia_sht,
	.host_flags = ATA_FLAG_SATA \| ATA_FLAG_SRST \| ATA_FLAG_NO_LEGACY,
	.pio_mask = 0x1f,
	.mwdma_mask = 0x07,
	.udma_mask = 0x7f,
	.port_ops = &svia_sata_ops,
	};

	MODULE_AUTHOR("Jeff Garzik");
	MODULE_DESCRIPTION("SCSI low-level driver for VIA SATA controllers");
	MODULE_LICENSE("GPL");
	MODULE_DEVICE_TABLE(pci, svia_pci_tbl);
	MODULE_VERSION(DRV_VERSION);

	static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg)
	{
	if (sc_reg > SCR_CONTROL)
	return 0xffffffffU;
	return inl(ap->ioaddr.scr_addr + (4 * sc_reg));
	}

	static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
	{
	if (sc_reg > SCR_CONTROL)
	return;
	outl(val, ap->ioaddr.scr_addr + (4 * sc_reg));
	}

	static const unsigned int svia_bar_sizes[] = {
	8, 4, 8, 4, 16, 256
	};

	static const unsigned int vt6421_bar_sizes[] = {
	16, 16, 16, 16, 32, 128
	};

	static unsigned long svia_scr_addr(unsigned long addr, unsigned int port)
	{
	return addr + (port * 128);
	}

	static unsigned long vt6421_scr_addr(unsigned long addr, unsigned int port)
	{
	return addr + (port * 64);
	}

	static void vt6421_init_addrs(struct ata_probe_ent *probe_ent,
	struct pci_dev *pdev,
	unsigned int port)
	{
	unsigned long reg_addr = pci_resource_start(pdev, port);
	unsigned long bmdma_addr = pci_resource_start(pdev, 4) + (port * 8);
	unsigned long scr_addr;

	probe_ent->port[port].cmd_addr = reg_addr;
	probe_ent->port[port].altstatus_addr =
	probe_ent->port[port].ctl_addr = (reg_addr + 8) \| ATA_PCI_CTL_OFS;
	probe_ent->port[port].bmdma_addr = bmdma_addr;

	scr_addr = vt6421_scr_addr(pci_resource_start(pdev, 5), port);
	probe_ent->port[port].scr_addr = scr_addr;

	ata_std_ports(&probe_ent->port[port]);
	}

	static struct ata_probe_ent vt6420_init_probe_ent(struct pci_dev pdev)
	{
	struct ata_probe_ent *probe_ent;
	struct ata_port_info *ppi = &svia_port_info;

	probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY \| ATA_PORT_SECONDARY);
	if (!probe_ent)
	return NULL;

	probe_ent->port[0].scr_addr =
	svia_scr_addr(pci_resource_start(pdev, 5), 0);
	probe_ent->port[1].scr_addr =
	svia_scr_addr(pci_resource_start(pdev, 5), 1);

	return probe_ent;
	}

	static struct ata_probe_ent vt6421_init_probe_ent(struct pci_dev pdev)
	{
	struct ata_probe_ent *probe_ent;
	unsigned int i;

	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
	if (!probe_ent)
	return NULL;

	memset(probe_ent, 0, sizeof(*probe_ent));
	probe_ent->dev = pci_dev_to_dev(pdev);
	INIT_LIST_HEAD(&probe_ent->node);

	probe_ent->sht = &svia_sht;
	probe_ent->host_flags = ATA_FLAG_SATA \| ATA_FLAG_SATA_RESET \|
	ATA_FLAG_NO_LEGACY;
	probe_ent->port_ops = &svia_sata_ops;
	probe_ent->n_ports = N_PORTS;
	probe_ent->irq = pdev->irq;
	probe_ent->irq_flags = SA_SHIRQ;
	probe_ent->pio_mask = 0x1f;
	probe_ent->mwdma_mask = 0x07;
	probe_ent->udma_mask = 0x7f;

	for (i = 0; i < N_PORTS; i++)
	vt6421_init_addrs(probe_ent, pdev, i);

	return probe_ent;
	}

	static void svia_configure(struct pci_dev *pdev)
	{
	u8 tmp8;

	pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &tmp8);
	dev_printk(KERN_INFO, &pdev->dev, "routed to hard irq line %d\n",
	(int) (tmp8 & 0xf0) == 0xf0 ? 0 : tmp8 & 0x0f);

	/* make sure SATA channels are enabled */
	pci_read_config_byte(pdev, SATA_CHAN_ENAB, &tmp8);
	if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
	dev_printk(KERN_DEBUG, &pdev->dev,
	"enabling SATA channels (0x%x)\n",
	(int) tmp8);
	tmp8 \|= ALL_PORTS;
	pci_write_config_byte(pdev, SATA_CHAN_ENAB, tmp8);
	}

	/* make sure interrupts for each channel sent to us */
	pci_read_config_byte(pdev, SATA_INT_GATE, &tmp8);
	if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
	dev_printk(KERN_DEBUG, &pdev->dev,
	"enabling SATA channel interrupts (0x%x)\n",
	(int) tmp8);
	tmp8 \|= ALL_PORTS;
	pci_write_config_byte(pdev, SATA_INT_GATE, tmp8);
	}

	/* make sure native mode is enabled */
	pci_read_config_byte(pdev, SATA_NATIVE_MODE, &tmp8);
	if ((tmp8 & NATIVE_MODE_ALL) != NATIVE_MODE_ALL) {
	dev_printk(KERN_DEBUG, &pdev->dev,
	"enabling SATA channel native mode (0x%x)\n",
	(int) tmp8);
	tmp8 \|= NATIVE_MODE_ALL;
	pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
	}
	}

	static int svia_init_one (struct pci_dev pdev, const struct pci_device_id ent)
	{
	static int printed_version;
	unsigned int i;
	int rc;
	struct ata_probe_ent *probe_ent;
	int board_id = (int) ent->driver_data;
	const int *bar_sizes;
	int pci_dev_busy = 0;
	u8 tmp8;

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

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

	rc = pci_request_regions(pdev, DRV_NAME);
	if (rc) {
	pci_dev_busy = 1;
	goto err_out;
	}

	if (board_id == vt6420) {
	pci_read_config_byte(pdev, SATA_PATA_SHARING, &tmp8);
	if (tmp8 & SATA_2DEV) {
	dev_printk(KERN_ERR, &pdev->dev,
	"SATA master/slave not supported (0x%x)\n",
	(int) tmp8);
	rc = -EIO;
	goto err_out_regions;
	}

	bar_sizes = &svia_bar_sizes[0];
	} else {
	bar_sizes = &vt6421_bar_sizes[0];
	}

	for (i = 0; i < ARRAY_SIZE(svia_bar_sizes); i++)
	if ((pci_resource_start(pdev, i) == 0) \|\|
	(pci_resource_len(pdev, i) < bar_sizes[i])) {
	dev_printk(KERN_ERR, &pdev->dev,
	"invalid PCI BAR %u (sz 0x%lx, val 0x%lx)\n",
	i,
	pci_resource_start(pdev, i),
	pci_resource_len(pdev, i));
	rc = -ENODEV;
	goto err_out_regions;
	}

	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
	if (rc)
	goto err_out_regions;
	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
	if (rc)
	goto err_out_regions;

	if (board_id == vt6420)
	probe_ent = vt6420_init_probe_ent(pdev);
	else
	probe_ent = vt6421_init_probe_ent(pdev);

	if (!probe_ent) {
	dev_printk(KERN_ERR, &pdev->dev, "out of memory\n");
	rc = -ENOMEM;
	goto err_out_regions;
	}

	svia_configure(pdev);

	pci_set_master(pdev);

	/* FIXME: check ata_device_add return value */
	ata_device_add(probe_ent);
	kfree(probe_ent);

	return 0;

	err_out_regions:
	pci_release_regions(pdev);
	err_out:
	if (!pci_dev_busy)
	pci_disable_device(pdev);
	return rc;
	}

	static int __init svia_init(void)
	{
	return pci_module_init(&svia_pci_driver);
	}

	static void __exit svia_exit(void)
	{
	pci_unregister_driver(&svia_pci_driver);
	}

	module_init(svia_init);
	module_exit(svia_exit);