Move libata to drivers/ata.

1 files changed, 730 insertions, 0 deletions

diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
new file mode 100644
index 0000000000..71bd6712b3
--- /dev/null
+++ b/drivers/ata/sata_qstor.c
@@ -0,0 +1,730 @@
+/*
+ *  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/DocBook/libata.*
+ *
+ */
+
+#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/interrupt.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <asm/io.h>
+#include <linux/libata.h>
+
+#define DRV_NAME        "sata_qstor"
+#define DRV_VERSION     "0.06"
+
+enum {
+        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_idle, qs_state_pkt, qs_state_mmio } qs_state_t;
+
+struct qs_port_priv {
+        u8                      *pkt;
+        dma_addr_t              pkt_dma;
+        qs_state_t              state;
+};
+
+static u32 qs_scr_read (struct ata_port *ap, unsigned int sc_reg);
+static void qs_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int qs_ata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static irqreturn_t qs_intr (int irq, void *dev_instance, struct pt_regs *regs);
+static int qs_port_start(struct ata_port *ap);
+static void qs_host_stop(struct ata_host_set *host_set);
+static void qs_port_stop(struct ata_port *ap);
+static void qs_phy_reset(struct ata_port *ap);
+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_bmdma_stop(struct ata_queued_cmd *qc);
+static u8 qs_bmdma_status(struct ata_port *ap);
+static void qs_irq_clear(struct ata_port *ap);
+static void qs_eng_timeout(struct ata_port *ap);
+
+static struct scsi_host_template qs_ata_sht = {
+        .module                 = THIS_MODULE,
+        .name                   = DRV_NAME,
+        .ioctl                  = ata_scsi_ioctl,
+        .queuecommand           = ata_scsi_queuecmd,
+        .can_queue              = ATA_DEF_QUEUE,
+        .this_id                = ATA_SHT_THIS_ID,
+        .sg_tablesize           = QS_MAX_PRD,
+        .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
+        .emulated               = ATA_SHT_EMULATED,
+        //FIXME .use_clustering         = ATA_SHT_USE_CLUSTERING,
+        .use_clustering         = ENABLE_CLUSTERING,
+        .proc_name              = DRV_NAME,
+        .dma_boundary           = QS_DMA_BOUNDARY,
+        .slave_configure        = ata_scsi_slave_config,
+        .slave_destroy          = ata_scsi_slave_destroy,
+        .bios_param             = ata_std_bios_param,
+};
+
+static const struct ata_port_operations qs_ata_ops = {
+        .port_disable           = ata_port_disable,
+        .tf_load                = ata_tf_load,
+        .tf_read                = ata_tf_read,
+        .check_status           = ata_check_status,
+        .check_atapi_dma        = qs_check_atapi_dma,
+        .exec_command           = ata_exec_command,
+        .dev_select             = ata_std_dev_select,
+        .phy_reset              = qs_phy_reset,
+        .qc_prep                = qs_qc_prep,
+        .qc_issue               = qs_qc_issue,
+        .data_xfer              = ata_mmio_data_xfer,
+        .eng_timeout            = qs_eng_timeout,
+        .irq_handler            = qs_intr,
+        .irq_clear              = qs_irq_clear,
+        .scr_read               = qs_scr_read,
+        .scr_write              = qs_scr_write,
+        .port_start             = qs_port_start,
+        .port_stop              = qs_port_stop,
+        .host_stop              = qs_host_stop,
+        .bmdma_stop             = qs_bmdma_stop,
+        .bmdma_status           = qs_bmdma_status,
+};
+
+static const struct ata_port_info qs_port_info[] = {
+        /* board_2068_idx */
+        {
+                .sht            = &qs_ata_sht,
+                .host_flags     = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+                                  ATA_FLAG_SATA_RESET |
+                                  //FIXME ATA_FLAG_SRST |
+                                  ATA_FLAG_MMIO | ATA_FLAG_PIO_POLLING,
+                .pio_mask       = 0x10, /* pio4 */
+                .udma_mask      = 0x7f, /* udma0-6 */
+                .port_ops       = &qs_ata_ops,
+        },
+};
+
+static const struct pci_device_id qs_ata_pci_tbl[] = {
+        { PCI_VENDOR_ID_PDC, 0x2068, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+          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 int qs_check_atapi_dma(struct ata_queued_cmd *qc)
+{
+        return 1;       /* ATAPI DMA not supported */
+}
+
+static void qs_bmdma_stop(struct ata_queued_cmd *qc)
+{
+        /* nothing */
+}
+
+static u8 qs_bmdma_status(struct ata_port *ap)
+{
+        return 0;
+}
+
+static void qs_irq_clear(struct ata_port *ap)
+{
+        /* nothing */
+}
+
+static inline void qs_enter_reg_mode(struct ata_port *ap)
+{
+        u8 __iomem *chan = ap->host_set->mmio_base + (ap->port_no * 0x4000);
+
+        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 = ap->host_set->mmio_base + (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_phy_reset(struct ata_port *ap)
+{
+        struct qs_port_priv *pp = ap->private_data;
+
+        pp->state = qs_state_idle;
+        qs_reset_channel_logic(ap);
+        sata_phy_reset(ap);
+}
+
+static void qs_eng_timeout(struct ata_port *ap)
+{
+        struct qs_port_priv *pp = ap->private_data;
+
+        if (pp->state != qs_state_idle) /* healthy paranoia */
+                pp->state = qs_state_mmio;
+        qs_reset_channel_logic(ap);
+        ata_eng_timeout(ap);
+}
+
+static u32 qs_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+        if (sc_reg > SCR_CONTROL)
+                return ~0U;
+        return readl((void __iomem *)(ap->ioaddr.scr_addr + (sc_reg * 8)));
+}
+
+static void qs_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
+{
+        if (sc_reg > SCR_CONTROL)
+                return;
+        writel(val, (void __iomem *)(ap->ioaddr.scr_addr + (sc_reg * 8)));
+}
+
+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;
+        unsigned int nelem;
+        u8 *prd = pp->pkt + QS_CPB_BYTES;
+
+        WARN_ON(qc->__sg == NULL);
+        WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
+
+        nelem = 0;
+        ata_for_each_sg(sg, qc) {
+                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)\n", nelem,
+                                        (unsigned long long)addr, len);
+                nelem++;
+        }
+
+        return nelem;
+}
+
+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\n");
+
+        qs_enter_reg_mode(qc->ap);
+        if (qc->tf.protocol != ATA_PROT_DMA) {
+                ata_qc_prep(qc);
+                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->nsect * ATA_SECT_SIZE);
+        *(__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, &buf[32], 0);
+}
+
+static inline void qs_packet_start(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        u8 __iomem *chan = ap->host_set->mmio_base + (ap->port_no * 0x4000);
+
+        VPRINTK("ENTER, ap %p\n", 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 ATA_PROT_ATAPI_DMA:
+                BUG();
+                break;
+
+        default:
+                break;
+        }
+
+        pp->state = qs_state_mmio;
+        return ata_qc_issue_prot(qc);
+}
+
+static inline unsigned int qs_intr_pkt(struct ata_host_set *host_set)
+{
+        unsigned int handled = 0;
+        u8 sFFE;
+        u8 __iomem *mmio_base = host_set->mmio_base;
+
+        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_set->ports[port_no];
+
+                        DPRINTK("SFF=%08x%08x: sCHAN=%u sHST=%d sDST=%02x\n",
+                                        sff1, sff0, port_no, sHST, sDST);
+                        handled = 1;
+                        if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
+                                struct ata_queued_cmd *qc;
+                                struct qs_port_priv *pp = ap->private_data;
+                                if (!pp || pp->state != qs_state_pkt)
+                                        continue;
+                                qc = ata_qc_from_tag(ap, ap->active_tag);
+                                if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
+                                        switch (sHST) {
+                                        case 0: /* successful CPB */
+                                        case 3: /* device error */
+                                                pp->state = qs_state_idle;
+                                                qs_enter_reg_mode(qc->ap);
+                                                qc->err_mask |= ac_err_mask(sDST);
+                                                ata_qc_complete(qc);
+                                                break;
+                                        default:
+                                                break;
+                                        }
+                                }
+                        }
+                }
+        } while (!sFFE);
+        return handled;
+}
+
+static inline unsigned int qs_intr_mmio(struct ata_host_set *host_set)
+{
+        unsigned int handled = 0, port_no;
+
+        for (port_no = 0; port_no < host_set->n_ports; ++port_no) {
+                struct ata_port *ap;
+                ap = host_set->ports[port_no];
+                if (ap &&
+                    !(ap->flags & ATA_FLAG_DISABLED)) {
+                        struct ata_queued_cmd *qc;
+                        struct qs_port_priv *pp = ap->private_data;
+                        if (!pp || pp->state != qs_state_mmio)
+                                continue;
+                        qc = ata_qc_from_tag(ap, ap->active_tag);
+                        if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
+
+                                /* check main status, clearing INTRQ */
+                                u8 status = ata_check_status(ap);
+                                if ((status & ATA_BUSY))
+                                        continue;
+                                DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
+                                        ap->id, qc->tf.protocol, status);
+
+                                /* complete taskfile transaction */
+                                pp->state = qs_state_idle;
+                                qc->err_mask |= ac_err_mask(status);
+                                ata_qc_complete(qc);
+                                handled = 1;
+                        }
+                }
+        }
+        return handled;
+}
+
+static irqreturn_t qs_intr(int irq, void *dev_instance, struct pt_regs *regs)
+{
+        struct ata_host_set *host_set = dev_instance;
+        unsigned int handled = 0;
+
+        VPRINTK("ENTER\n");
+
+        spin_lock(&host_set->lock);
+        handled  = qs_intr_pkt(host_set) | qs_intr_mmio(host_set);
+        spin_unlock(&host_set->lock);
+
+        VPRINTK("EXIT\n");
+
+        return IRQ_RETVAL(handled);
+}
+
+static void qs_ata_setup_port(struct ata_ioports *port, unsigned long 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_set->dev;
+        struct qs_port_priv *pp;
+        void __iomem *mmio_base = ap->host_set->mmio_base;
+        void __iomem *chan = mmio_base + (ap->port_no * 0x4000);
+        u64 addr;
+        int rc;
+
+        rc = ata_port_start(ap);
+        if (rc)
+                return rc;
+        qs_enter_reg_mode(ap);
+        pp = kzalloc(sizeof(*pp), GFP_KERNEL);
+        if (!pp) {
+                rc = -ENOMEM;
+                goto err_out;
+        }
+        pp->pkt = dma_alloc_coherent(dev, QS_PKT_BYTES, &pp->pkt_dma,
+                                                                GFP_KERNEL);
+        if (!pp->pkt) {
+                rc = -ENOMEM;
+                goto err_out_kfree;
+        }
+        memset(pp->pkt, 0, QS_PKT_BYTES);
+        ap->private_data = pp;
+
+        addr = (u64)pp->pkt_dma;
+        writel((u32) addr,        chan + QS_CCF_CPBA);
+        writel((u32)(addr >> 32), chan + QS_CCF_CPBA + 4);
+        return 0;
+
+err_out_kfree:
+        kfree(pp);
+err_out:
+        ata_port_stop(ap);
+        return rc;
+}
+
+static void qs_port_stop(struct ata_port *ap)
+{
+        struct device *dev = ap->host_set->dev;
+        struct qs_port_priv *pp = ap->private_data;
+
+        if (pp != NULL) {
+                ap->private_data = NULL;
+                if (pp->pkt != NULL)
+                        dma_free_coherent(dev, QS_PKT_BYTES, pp->pkt,
+                                                                pp->pkt_dma);
+                kfree(pp);
+        }
+        ata_port_stop(ap);
+}
+
+static void qs_host_stop(struct ata_host_set *host_set)
+{
+        void __iomem *mmio_base = host_set->mmio_base;
+        struct pci_dev *pdev = to_pci_dev(host_set->dev);
+
+        writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */
+        writeb(QS_CNFG3_GSRST, mmio_base + QS_HCF_CNFG3); /* global reset */
+
+        pci_iounmap(pdev, mmio_base);
+}
+
+static void qs_host_init(unsigned int chip_id, struct ata_probe_ent *pe)
+{
+        void __iomem *mmio_base = pe->mmio_base;
+        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 < pe->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 < pe->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 &&
+            !pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
+                rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
+                if (rc) {
+                        rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+                        if (rc) {
+                                dev_printk(KERN_ERR, &pdev->dev,
+                                           "64-bit DMA enable failed\n");
+                                return rc;
+                        }
+                }
+        } else {
+                rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+                if (rc) {
+                        dev_printk(KERN_ERR, &pdev->dev,
+                                "32-bit DMA enable failed\n");
+                        return rc;
+                }
+                rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+                if (rc) {
+                        dev_printk(KERN_ERR, &pdev->dev,
+                                "32-bit consistent DMA enable failed\n");
+                        return rc;
+                }
+        }
+        return 0;
+}
+
+static int qs_ata_init_one(struct pci_dev *pdev,
+                                const struct pci_device_id *ent)
+{
+        static int printed_version;
+        struct ata_probe_ent *probe_ent = NULL;
+        void __iomem *mmio_base;
+        unsigned int board_idx = (unsigned int) ent->driver_data;
+        int rc, port_no;
+
+        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)
+                goto err_out;
+
+        if ((pci_resource_flags(pdev, 4) & IORESOURCE_MEM) == 0) {
+                rc = -ENODEV;
+                goto err_out_regions;
+        }
+
+        mmio_base = pci_iomap(pdev, 4, 0);
+        if (mmio_base == NULL) {
+                rc = -ENOMEM;
+                goto err_out_regions;
+        }
+
+        rc = qs_set_dma_masks(pdev, mmio_base);
+        if (rc)
+                goto err_out_iounmap;
+
+        probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+        if (probe_ent == NULL) {
+                rc = -ENOMEM;
+                goto err_out_iounmap;
+        }
+
+        memset(probe_ent, 0, sizeof(*probe_ent));
+        probe_ent->dev = pci_dev_to_dev(pdev);
+        INIT_LIST_HEAD(&probe_ent->node);
+
+        probe_ent->sht          = qs_port_info[board_idx].sht;
+        probe_ent->host_flags   = qs_port_info[board_idx].host_flags;
+        probe_ent->pio_mask     = qs_port_info[board_idx].pio_mask;
+        probe_ent->mwdma_mask   = qs_port_info[board_idx].mwdma_mask;
+        probe_ent->udma_mask    = qs_port_info[board_idx].udma_mask;
+        probe_ent->port_ops     = qs_port_info[board_idx].port_ops;
+
+        probe_ent->irq          = pdev->irq;
+        probe_ent->irq_flags    = IRQF_SHARED;
+        probe_ent->mmio_base    = mmio_base;
+        probe_ent->n_ports      = QS_PORTS;
+
+        for (port_no = 0; port_no < probe_ent->n_ports; ++port_no) {
+                unsigned long chan = (unsigned long)mmio_base +
+                                                        (port_no * 0x4000);
+                qs_ata_setup_port(&probe_ent->port[port_no], chan);
+        }
+
+        pci_set_master(pdev);
+
+        /* initialize adapter */
+        qs_host_init(board_idx, probe_ent);
+
+        rc = ata_device_add(probe_ent);
+        kfree(probe_ent);
+        if (rc != QS_PORTS)
+                goto err_out_iounmap;
+        return 0;
+
+err_out_iounmap:
+        pci_iounmap(pdev, mmio_base);
+err_out_regions:
+        pci_release_regions(pdev);
+err_out:
+        pci_disable_device(pdev);
+        return rc;
+}
+
+static int __init qs_ata_init(void)
+{
+        return pci_register_driver(&qs_ata_pci_driver);
+}
+
+static void __exit qs_ata_exit(void)
+{
+        pci_unregister_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);
+
+module_init(qs_ata_init);
+module_exit(qs_ata_exit);