/*
   *  sata_qstor.c - Pacific Digital Corporation QStor SATA
   *
   *  Maintained by:  Mark Lord <mlord@pobox.com>
   *
   *  Copyright 2005 Pacific Digital Corporation.
   *  (OSL/GPL code release authorized by Jalil Fadavi).
   *

   *
   *  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/driver-api/libata.rst

   *
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>

  #include <linux/gfp.h>

  #include <linux/pci.h>

  #include <linux/blkdev.h>
  #include <linux/delay.h>
  #include <linux/interrupt.h>

  #include <linux/device.h>

  #include <scsi/scsi_host.h>

  #include <linux/libata.h>
  
  #define DRV_NAME	"sata_qstor"

  #define DRV_VERSION	"0.09"

  
  enum {

  	QS_MMIO_BAR		= 4,

  	QS_PORTS		= 4,
  	QS_MAX_PRD		= LIBATA_MAX_PRD,
  	QS_CPB_ORDER		= 6,
  	QS_CPB_BYTES		= (1 << QS_CPB_ORDER),
  	QS_PRD_BYTES		= QS_MAX_PRD * 16,
  	QS_PKT_BYTES		= QS_CPB_BYTES + QS_PRD_BYTES,

  	/* global register offsets */
  	QS_HCF_CNFG3		= 0x0003, /* host configuration offset */
  	QS_HID_HPHY		= 0x0004, /* host physical interface info */
  	QS_HCT_CTRL		= 0x00e4, /* global interrupt mask offset */
  	QS_HST_SFF		= 0x0100, /* host status fifo offset */
  	QS_HVS_SERD3		= 0x0393, /* PHY enable offset */
  
  	/* global control bits */
  	QS_HPHY_64BIT		= (1 << 1), /* 64-bit bus detected */
  	QS_CNFG3_GSRST		= 0x01,     /* global chip reset */
  	QS_SERD3_PHY_ENA	= 0xf0,     /* PHY detection ENAble*/
  
  	/* per-channel register offsets */
  	QS_CCF_CPBA		= 0x0710, /* chan CPB base address */
  	QS_CCF_CSEP		= 0x0718, /* chan CPB separation factor */
  	QS_CFC_HUFT		= 0x0800, /* host upstream fifo threshold */
  	QS_CFC_HDFT		= 0x0804, /* host downstream fifo threshold */
  	QS_CFC_DUFT		= 0x0808, /* dev upstream fifo threshold */
  	QS_CFC_DDFT		= 0x080c, /* dev downstream fifo threshold */
  	QS_CCT_CTR0		= 0x0900, /* chan control-0 offset */
  	QS_CCT_CTR1		= 0x0901, /* chan control-1 offset */
  	QS_CCT_CFF		= 0x0a00, /* chan command fifo offset */
  
  	/* channel control bits */
  	QS_CTR0_REG		= (1 << 1),   /* register mode (vs. pkt mode) */
  	QS_CTR0_CLER		= (1 << 2),   /* clear channel errors */
  	QS_CTR1_RDEV		= (1 << 1),   /* sata phy/comms reset */
  	QS_CTR1_RCHN		= (1 << 4),   /* reset channel logic */
  	QS_CCF_RUN_PKT		= 0x107,      /* RUN a new dma PKT */
  
  	/* pkt sub-field headers */
  	QS_HCB_HDR		= 0x01,   /* Host Control Block header */
  	QS_DCB_HDR		= 0x02,   /* Device Control Block header */
  
  	/* pkt HCB flag bits */
  	QS_HF_DIRO		= (1 << 0),   /* data DIRection Out */
  	QS_HF_DAT		= (1 << 3),   /* DATa pkt */
  	QS_HF_IEN		= (1 << 4),   /* Interrupt ENable */
  	QS_HF_VLD		= (1 << 5),   /* VaLiD pkt */
  
  	/* pkt DCB flag bits */
  	QS_DF_PORD		= (1 << 2),   /* Pio OR Dma */
  	QS_DF_ELBA		= (1 << 3),   /* Extended LBA (lba48) */
  
  	/* PCI device IDs */
  	board_2068_idx		= 0,	/* QStor 4-port SATA/RAID */
  };

  enum {
  	QS_DMA_BOUNDARY		= ~0UL
  };

  typedef enum { qs_state_mmio, qs_state_pkt } qs_state_t;

  
  struct qs_port_priv {
  	u8			*pkt;
  	dma_addr_t		pkt_dma;
  	qs_state_t		state;
  };

  static int qs_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
  static int qs_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);

  static int qs_ata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);

  static int qs_port_start(struct ata_port *ap);

  static void qs_host_stop(struct ata_host *host);

  static void qs_qc_prep(struct ata_queued_cmd *qc);

  static unsigned int qs_qc_issue(struct ata_queued_cmd *qc);

  static int qs_check_atapi_dma(struct ata_queued_cmd *qc);

  static void qs_freeze(struct ata_port *ap);
  static void qs_thaw(struct ata_port *ap);

  static int qs_prereset(struct ata_link *link, unsigned long deadline);

  static void qs_error_handler(struct ata_port *ap);

  static struct scsi_host_template qs_ata_sht = {

  	ATA_BASE_SHT(DRV_NAME),

  	.sg_tablesize		= QS_MAX_PRD,

  	.dma_boundary		= QS_DMA_BOUNDARY,

  };

  static struct ata_port_operations qs_ata_ops = {
  	.inherits		= &ata_sff_port_ops,

  	.check_atapi_dma	= qs_check_atapi_dma,

  	.qc_prep		= qs_qc_prep,
  	.qc_issue		= qs_qc_issue,

  	.freeze			= qs_freeze,
  	.thaw			= qs_thaw,

  	.prereset		= qs_prereset,
  	.softreset		= ATA_OP_NULL,

  	.error_handler		= qs_error_handler,

  	.lost_interrupt		= ATA_OP_NULL,

  	.scr_read		= qs_scr_read,
  	.scr_write		= qs_scr_write,

  	.port_start		= qs_port_start,

  	.host_stop		= qs_host_stop,

  };

  static const struct ata_port_info qs_port_info[] = {

  	/* board_2068_idx */
  	{

  		.flags		= ATA_FLAG_SATA | ATA_FLAG_PIO_POLLING,

  		.pio_mask	= ATA_PIO4_ONLY,

  		.udma_mask	= ATA_UDMA6,

  		.port_ops	= &qs_ata_ops,
  	},
  };

  static const struct pci_device_id qs_ata_pci_tbl[] = {

  	{ PCI_VDEVICE(PDC, 0x2068), board_2068_idx },

  
  	{ }	/* terminate list */
  };
  
  static struct pci_driver qs_ata_pci_driver = {
  	.name			= DRV_NAME,
  	.id_table		= qs_ata_pci_tbl,
  	.probe			= qs_ata_init_one,
  	.remove			= ata_pci_remove_one,
  };

  static void __iomem *qs_mmio_base(struct ata_host *host)
  {
  	return host->iomap[QS_MMIO_BAR];
  }

  static int qs_check_atapi_dma(struct ata_queued_cmd *qc)
  {
  	return 1;	/* ATAPI DMA not supported */
  }

  static inline void qs_enter_reg_mode(struct ata_port *ap)
  {

  	u8 __iomem *chan = qs_mmio_base(ap->host) + (ap->port_no * 0x4000);

  	struct qs_port_priv *pp = ap->private_data;

  	pp->state = qs_state_mmio;

  	writeb(QS_CTR0_REG, chan + QS_CCT_CTR0);
  	readb(chan + QS_CCT_CTR0);        /* flush */
  }
  
  static inline void qs_reset_channel_logic(struct ata_port *ap)
  {

  	u8 __iomem *chan = qs_mmio_base(ap->host) + (ap->port_no * 0x4000);

  
  	writeb(QS_CTR1_RCHN, chan + QS_CCT_CTR1);
  	readb(chan + QS_CCT_CTR0);        /* flush */
  	qs_enter_reg_mode(ap);
  }

  static void qs_freeze(struct ata_port *ap)

  {

  	u8 __iomem *mmio_base = qs_mmio_base(ap->host);
  
  	writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */
  	qs_enter_reg_mode(ap);

  }

  static void qs_thaw(struct ata_port *ap)

  {

  	u8 __iomem *mmio_base = qs_mmio_base(ap->host);
  
  	qs_enter_reg_mode(ap);
  	writeb(1, mmio_base + QS_HCT_CTRL); /* enable host interrupts */
  }
  
  static int qs_prereset(struct ata_link *link, unsigned long deadline)
  {
  	struct ata_port *ap = link->ap;

  	qs_reset_channel_logic(ap);

  	return ata_sff_prereset(link, deadline);

  }

  static int qs_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)

  {
  	if (sc_reg > SCR_CONTROL)

  		return -EINVAL;

  	*val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 8));

  	return 0;

  }

  static void qs_error_handler(struct ata_port *ap)
  {
  	qs_enter_reg_mode(ap);

  	ata_sff_error_handler(ap);

  }

  static int qs_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)

  {
  	if (sc_reg > SCR_CONTROL)

  		return -EINVAL;

  	writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 8));

  	return 0;

  }

  static unsigned int qs_fill_sg(struct ata_queued_cmd *qc)

  {

  	struct scatterlist *sg;

  	struct ata_port *ap = qc->ap;
  	struct qs_port_priv *pp = ap->private_data;

  	u8 *prd = pp->pkt + QS_CPB_BYTES;

  	unsigned int si;

  	for_each_sg(qc->sg, sg, qc->n_elem, si) {

  		u64 addr;
  		u32 len;
  
  		addr = sg_dma_address(sg);
  		*(__le64 *)prd = cpu_to_le64(addr);
  		prd += sizeof(u64);
  
  		len = sg_dma_len(sg);
  		*(__le32 *)prd = cpu_to_le32(len);
  		prd += sizeof(u64);

  		VPRINTK("PRD[%u] = (0x%llX, 0x%X)
  ", si,

  					(unsigned long long)addr, len);
  	}

  	return si;

  }
  
  static void qs_qc_prep(struct ata_queued_cmd *qc)
  {
  	struct qs_port_priv *pp = qc->ap->private_data;
  	u8 dflags = QS_DF_PORD, *buf = pp->pkt;
  	u8 hflags = QS_HF_DAT | QS_HF_IEN | QS_HF_VLD;
  	u64 addr;

  	unsigned int nelem;

  
  	VPRINTK("ENTER
  ");
  
  	qs_enter_reg_mode(qc->ap);

  	if (qc->tf.protocol != ATA_PROT_DMA)

  		return;

  	nelem = qs_fill_sg(qc);

  
  	if ((qc->tf.flags & ATA_TFLAG_WRITE))
  		hflags |= QS_HF_DIRO;
  	if ((qc->tf.flags & ATA_TFLAG_LBA48))
  		dflags |= QS_DF_ELBA;
  
  	/* host control block (HCB) */
  	buf[ 0] = QS_HCB_HDR;
  	buf[ 1] = hflags;

  	*(__le32 *)(&buf[ 4]) = cpu_to_le32(qc->nbytes);

  	*(__le32 *)(&buf[ 8]) = cpu_to_le32(nelem);

  	addr = ((u64)pp->pkt_dma) + QS_CPB_BYTES;
  	*(__le64 *)(&buf[16]) = cpu_to_le64(addr);
  
  	/* device control block (DCB) */
  	buf[24] = QS_DCB_HDR;
  	buf[28] = dflags;
  
  	/* frame information structure (FIS) */

  	ata_tf_to_fis(&qc->tf, 0, 1, &buf[32]);

  }
  
  static inline void qs_packet_start(struct ata_queued_cmd *qc)
  {
  	struct ata_port *ap = qc->ap;

  	u8 __iomem *chan = qs_mmio_base(ap->host) + (ap->port_no * 0x4000);

  
  	VPRINTK("ENTER, ap %p
  ", ap);
  
  	writeb(QS_CTR0_CLER, chan + QS_CCT_CTR0);
  	wmb();                             /* flush PRDs and pkt to memory */
  	writel(QS_CCF_RUN_PKT, chan + QS_CCT_CFF);
  	readl(chan + QS_CCT_CFF);          /* flush */
  }

  static unsigned int qs_qc_issue(struct ata_queued_cmd *qc)

  {
  	struct qs_port_priv *pp = qc->ap->private_data;
  
  	switch (qc->tf.protocol) {
  	case ATA_PROT_DMA:

  		pp->state = qs_state_pkt;
  		qs_packet_start(qc);
  		return 0;

  	case ATAPI_PROT_DMA:

  		BUG();
  		break;
  
  	default:
  		break;
  	}
  
  	pp->state = qs_state_mmio;

  	return ata_sff_qc_issue(qc);

  }

  static void qs_do_or_die(struct ata_queued_cmd *qc, u8 status)
  {
  	qc->err_mask |= ac_err_mask(status);
  
  	if (!qc->err_mask) {
  		ata_qc_complete(qc);
  	} else {
  		struct ata_port    *ap  = qc->ap;
  		struct ata_eh_info *ehi = &ap->link.eh_info;
  
  		ata_ehi_clear_desc(ehi);
  		ata_ehi_push_desc(ehi, "status 0x%02X", status);
  
  		if (qc->err_mask == AC_ERR_DEV)
  			ata_port_abort(ap);
  		else
  			ata_port_freeze(ap);
  	}
  }

  static inline unsigned int qs_intr_pkt(struct ata_host *host)

  {
  	unsigned int handled = 0;
  	u8 sFFE;

  	u8 __iomem *mmio_base = qs_mmio_base(host);

  
  	do {
  		u32 sff0 = readl(mmio_base + QS_HST_SFF);
  		u32 sff1 = readl(mmio_base + QS_HST_SFF + 4);
  		u8 sEVLD = (sff1 >> 30) & 0x01;	/* valid flag */
  		sFFE  = sff1 >> 31;		/* empty flag */
  
  		if (sEVLD) {
  			u8 sDST = sff0 >> 16;	/* dev status */
  			u8 sHST = sff1 & 0x3f;	/* host status */
  			unsigned int port_no = (sff1 >> 8) & 0x03;

  			struct ata_port *ap = host->ports[port_no];

  			struct qs_port_priv *pp = ap->private_data;
  			struct ata_queued_cmd *qc;

  
  			DPRINTK("SFF=%08x%08x: sCHAN=%u sHST=%d sDST=%02x
  ",
  					sff1, sff0, port_no, sHST, sDST);
  			handled = 1;

  			if (!pp || pp->state != qs_state_pkt)
  				continue;
  			qc = ata_qc_from_tag(ap, ap->link.active_tag);
  			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
  				switch (sHST) {
  				case 0: /* successful CPB */
  				case 3: /* device error */
  					qs_enter_reg_mode(qc->ap);
  					qs_do_or_die(qc, sDST);
  					break;
  				default:
  					break;

  				}
  			}
  		}
  	} while (!sFFE);
  	return handled;
  }

  static inline unsigned int qs_intr_mmio(struct ata_host *host)

  {
  	unsigned int handled = 0, port_no;

  	for (port_no = 0; port_no < host->n_ports; ++port_no) {

  		struct ata_port *ap = host->ports[port_no];
  		struct qs_port_priv *pp = ap->private_data;
  		struct ata_queued_cmd *qc;
  
  		qc = ata_qc_from_tag(ap, ap->link.active_tag);
  		if (!qc) {
  			/*
  			 * The qstor hardware generates spurious
  			 * interrupts from time to time when switching
  			 * in and out of packet mode.  There's no
  			 * obvious way to know if we're here now due
  			 * to that, so just ack the irq and pretend we
  			 * knew it was ours.. (ugh).  This does not
  			 * affect packet mode.
  			 */
  			ata_sff_check_status(ap);
  			handled = 1;
  			continue;

  		}

  
  		if (!pp || pp->state != qs_state_mmio)
  			continue;
  		if (!(qc->tf.flags & ATA_TFLAG_POLLING))

  			handled |= ata_sff_port_intr(ap, qc);

  	}
  	return handled;
  }

  static irqreturn_t qs_intr(int irq, void *dev_instance)

  {

  	struct ata_host *host = dev_instance;

  	unsigned int handled = 0;

  	unsigned long flags;

  
  	VPRINTK("ENTER
  ");

  	spin_lock_irqsave(&host->lock, flags);

  	handled  = qs_intr_pkt(host) | qs_intr_mmio(host);

  	spin_unlock_irqrestore(&host->lock, flags);

  
  	VPRINTK("EXIT
  ");
  
  	return IRQ_RETVAL(handled);
  }

  static void qs_ata_setup_port(struct ata_ioports *port, void __iomem *base)

  {
  	port->cmd_addr		=
  	port->data_addr		= base + 0x400;
  	port->error_addr	=
  	port->feature_addr	= base + 0x408; /* hob_feature = 0x409 */
  	port->nsect_addr	= base + 0x410; /* hob_nsect   = 0x411 */
  	port->lbal_addr		= base + 0x418; /* hob_lbal    = 0x419 */
  	port->lbam_addr		= base + 0x420; /* hob_lbam    = 0x421 */
  	port->lbah_addr		= base + 0x428; /* hob_lbah    = 0x429 */
  	port->device_addr	= base + 0x430;
  	port->status_addr	=
  	port->command_addr	= base + 0x438;
  	port->altstatus_addr	=
  	port->ctl_addr		= base + 0x440;
  	port->scr_addr		= base + 0xc00;
  }
  
  static int qs_port_start(struct ata_port *ap)
  {

  	struct device *dev = ap->host->dev;

  	struct qs_port_priv *pp;

  	void __iomem *mmio_base = qs_mmio_base(ap->host);

  	void __iomem *chan = mmio_base + (ap->port_no * 0x4000);
  	u64 addr;

  	pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
  	if (!pp)
  		return -ENOMEM;
  	pp->pkt = dmam_alloc_coherent(dev, QS_PKT_BYTES, &pp->pkt_dma,
  				      GFP_KERNEL);
  	if (!pp->pkt)
  		return -ENOMEM;

  	memset(pp->pkt, 0, QS_PKT_BYTES);
  	ap->private_data = pp;

  	qs_enter_reg_mode(ap);

  	addr = (u64)pp->pkt_dma;
  	writel((u32) addr,        chan + QS_CCF_CPBA);
  	writel((u32)(addr >> 32), chan + QS_CCF_CPBA + 4);
  	return 0;

  }

  static void qs_host_stop(struct ata_host *host)

  {

  	void __iomem *mmio_base = qs_mmio_base(host);

  
  	writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */
  	writeb(QS_CNFG3_GSRST, mmio_base + QS_HCF_CNFG3); /* global reset */
  }

  static void qs_host_init(struct ata_host *host, unsigned int chip_id)

  {

  	void __iomem *mmio_base = host->iomap[QS_MMIO_BAR];

  	unsigned int port_no;
  
  	writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */
  	writeb(QS_CNFG3_GSRST, mmio_base + QS_HCF_CNFG3); /* global reset */
  
  	/* reset each channel in turn */

  	for (port_no = 0; port_no < host->n_ports; ++port_no) {

  		u8 __iomem *chan = mmio_base + (port_no * 0x4000);
  		writeb(QS_CTR1_RDEV|QS_CTR1_RCHN, chan + QS_CCT_CTR1);
  		writeb(QS_CTR0_REG, chan + QS_CCT_CTR0);
  		readb(chan + QS_CCT_CTR0);        /* flush */
  	}
  	writeb(QS_SERD3_PHY_ENA, mmio_base + QS_HVS_SERD3); /* enable phy */

  	for (port_no = 0; port_no < host->n_ports; ++port_no) {

  		u8 __iomem *chan = mmio_base + (port_no * 0x4000);
  		/* set FIFO depths to same settings as Windows driver */
  		writew(32, chan + QS_CFC_HUFT);
  		writew(32, chan + QS_CFC_HDFT);
  		writew(10, chan + QS_CFC_DUFT);
  		writew( 8, chan + QS_CFC_DDFT);
  		/* set CPB size in bytes, as a power of two */
  		writeb(QS_CPB_ORDER,    chan + QS_CCF_CSEP);
  	}
  	writeb(1, mmio_base + QS_HCT_CTRL); /* enable host interrupts */
  }
  
  /*
   * The QStor understands 64-bit buses, and uses 64-bit fields
   * for DMA pointers regardless of bus width.  We just have to
   * make sure our DMA masks are set appropriately for whatever
   * bridge lies between us and the QStor, and then the DMA mapping
   * code will ensure we only ever "see" appropriate buffer addresses.
   * If we're 32-bit limited somewhere, then our 64-bit fields will
   * just end up with zeros in the upper 32-bits, without any special
   * logic required outside of this routine (below).
   */
  static int qs_set_dma_masks(struct pci_dev *pdev, void __iomem *mmio_base)
  {
  	u32 bus_info = readl(mmio_base + QS_HID_HPHY);
  	int rc, have_64bit_bus = (bus_info & QS_HPHY_64BIT);
  
  	if (have_64bit_bus &&

  	    !dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
  		rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));

  		if (rc) {

  			rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));

  			if (rc) {

  				dev_err(&pdev->dev,
  					"64-bit DMA enable failed
  ");

  				return rc;
  			}
  		}
  	} else {

  		rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));

  		if (rc) {

  			dev_err(&pdev->dev, "32-bit DMA enable failed
  ");

  			return rc;
  		}

  		rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));

  		if (rc) {

  			dev_err(&pdev->dev,

  				"32-bit consistent DMA enable failed
  ");

  			return rc;
  		}
  	}
  	return 0;
  }
  
  static int qs_ata_init_one(struct pci_dev *pdev,
  				const struct pci_device_id *ent)
  {

  	unsigned int board_idx = (unsigned int) ent->driver_data;

  	const struct ata_port_info *ppi[] = { &qs_port_info[board_idx], NULL };
  	struct ata_host *host;

  	int rc, port_no;

  	ata_print_version_once(&pdev->dev, DRV_VERSION);

  	/* alloc host */
  	host = ata_host_alloc_pinfo(&pdev->dev, ppi, QS_PORTS);
  	if (!host)
  		return -ENOMEM;
  
  	/* acquire resources and fill host */

  	rc = pcim_enable_device(pdev);

  	if (rc)
  		return rc;

  	if ((pci_resource_flags(pdev, QS_MMIO_BAR) & IORESOURCE_MEM) == 0)

  		return -ENODEV;

  	rc = pcim_iomap_regions(pdev, 1 << QS_MMIO_BAR, DRV_NAME);
  	if (rc)
  		return rc;

  	host->iomap = pcim_iomap_table(pdev);

  	rc = qs_set_dma_masks(pdev, host->iomap[QS_MMIO_BAR]);

  	if (rc)

  		return rc;

  	for (port_no = 0; port_no < host->n_ports; ++port_no) {

  		struct ata_port *ap = host->ports[port_no];
  		unsigned int offset = port_no * 0x4000;
  		void __iomem *chan = host->iomap[QS_MMIO_BAR] + offset;
  
  		qs_ata_setup_port(&ap->ioaddr, chan);
  
  		ata_port_pbar_desc(ap, QS_MMIO_BAR, -1, "mmio");
  		ata_port_pbar_desc(ap, QS_MMIO_BAR, offset, "port");

  	}

  	/* initialize adapter */

  	qs_host_init(host, board_idx);

  	pci_set_master(pdev);
  	return ata_host_activate(host, pdev->irq, qs_intr, IRQF_SHARED,
  				 &qs_ata_sht);

  }

  module_pci_driver(qs_ata_pci_driver);

  
  MODULE_AUTHOR("Mark Lord");
  MODULE_DESCRIPTION("Pacific Digital Corporation QStor SATA low-level driver");
  MODULE_LICENSE("GPL");
  MODULE_DEVICE_TABLE(pci, qs_ata_pci_tbl);
  MODULE_VERSION(DRV_VERSION);