/*
 *  ahci.c - AHCI SATA support
 *
 *  Maintained by:  Tejun Heo <tj@kernel.org>
 *                  Please ALWAYS copy linux-ide@vger.kernel.org
 *                  on emails.
 *
 *  Copyright 2004-2005 Red Hat, Inc.
 *
 *
 *  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.*
 *
 * AHCI hardware documentation:
 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <linux/dmi.h>
#include <linux/gfp.h>
#include <linux/msi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>
#include "ahci.h"

#define DRV_NAME        "ahci"
#define DRV_VERSION     "3.0"

enum {
        AHCI_PCI_BAR_STA2X11    = 0,
        AHCI_PCI_BAR_CAVIUM     = 0,
        AHCI_PCI_BAR_ENMOTUS    = 2,
        AHCI_PCI_BAR_STANDARD   = 5,
};

enum board_ids {
        /* board IDs by feature in alphabetical order */
        board_ahci,
        board_ahci_ign_iferr,
        board_ahci_nomsi,
        board_ahci_noncq,
        board_ahci_nosntf,
        board_ahci_yes_fbs,

        /* board IDs for specific chipsets in alphabetical order */
        board_ahci_avn,
        board_ahci_mcp65,
        board_ahci_mcp77,
        board_ahci_mcp89,
        board_ahci_mv,
        board_ahci_sb600,
        board_ahci_sb700,       /* for SB700 and SB800 */
        board_ahci_vt8251,

        /* aliases */
        board_ahci_mcp_linux    = board_ahci_mcp65,
        board_ahci_mcp67        = board_ahci_mcp65,
        board_ahci_mcp73        = board_ahci_mcp65,
        board_ahci_mcp79        = board_ahci_mcp77,
};

static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static void ahci_remove_one(struct pci_dev *dev);
static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
                                 unsigned long deadline);
static int ahci_avn_hardreset(struct ata_link *link, unsigned int *class,
                              unsigned long deadline);
static void ahci_mcp89_apple_enable(struct pci_dev *pdev);
static bool is_mcp89_apple(struct pci_dev *pdev);
static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
                                unsigned long deadline);
#ifdef CONFIG_PM
static int ahci_pci_device_runtime_suspend(struct device *dev);
static int ahci_pci_device_runtime_resume(struct device *dev);
#ifdef CONFIG_PM_SLEEP
static int ahci_pci_device_suspend(struct device *dev);
static int ahci_pci_device_resume(struct device *dev);
#endif
#endif /* CONFIG_PM */

static struct scsi_host_template ahci_sht = {
        AHCI_SHT("ahci"),
};

static struct ata_port_operations ahci_vt8251_ops = {
        .inherits               = &ahci_ops,
        .hardreset              = ahci_vt8251_hardreset,
};

static struct ata_port_operations ahci_p5wdh_ops = {
        .inherits               = &ahci_ops,
        .hardreset              = ahci_p5wdh_hardreset,
};

static struct ata_port_operations ahci_avn_ops = {
        .inherits               = &ahci_ops,
        .hardreset              = ahci_avn_hardreset,
};

static const struct ata_port_info ahci_port_info[] = {
        /* by features */
        [board_ahci] = {
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        [board_ahci_ign_iferr] = {
                AHCI_HFLAGS     (AHCI_HFLAG_IGN_IRQ_IF_ERR),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        [board_ahci_nomsi] = {
                AHCI_HFLAGS     (AHCI_HFLAG_NO_MSI),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        [board_ahci_noncq] = {
                AHCI_HFLAGS     (AHCI_HFLAG_NO_NCQ),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        [board_ahci_nosntf] = {
                AHCI_HFLAGS     (AHCI_HFLAG_NO_SNTF),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        [board_ahci_yes_fbs] = {
                AHCI_HFLAGS     (AHCI_HFLAG_YES_FBS),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        /* by chipsets */
        [board_ahci_avn] = {
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_avn_ops,
        },
        [board_ahci_mcp65] = {
                AHCI_HFLAGS     (AHCI_HFLAG_NO_FPDMA_AA | AHCI_HFLAG_NO_PMP |
                                 AHCI_HFLAG_YES_NCQ),
                .flags          = AHCI_FLAG_COMMON | ATA_FLAG_NO_DIPM,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        [board_ahci_mcp77] = {
                AHCI_HFLAGS     (AHCI_HFLAG_NO_FPDMA_AA | AHCI_HFLAG_NO_PMP),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        [board_ahci_mcp89] = {
                AHCI_HFLAGS     (AHCI_HFLAG_NO_FPDMA_AA),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        [board_ahci_mv] = {
                AHCI_HFLAGS     (AHCI_HFLAG_NO_NCQ | AHCI_HFLAG_NO_MSI |
                                 AHCI_HFLAG_MV_PATA | AHCI_HFLAG_NO_PMP),
                .flags          = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_ops,
        },
        [board_ahci_sb600] = {
                AHCI_HFLAGS     (AHCI_HFLAG_IGN_SERR_INTERNAL |
                                 AHCI_HFLAG_NO_MSI | AHCI_HFLAG_SECT255 |
                                 AHCI_HFLAG_32BIT_ONLY),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_pmp_retry_srst_ops,
        },
        [board_ahci_sb700] = {  /* for SB700 and SB800 */
                AHCI_HFLAGS     (AHCI_HFLAG_IGN_SERR_INTERNAL),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_pmp_retry_srst_ops,
        },
        [board_ahci_vt8251] = {
                AHCI_HFLAGS     (AHCI_HFLAG_NO_NCQ | AHCI_HFLAG_NO_PMP),
                .flags          = AHCI_FLAG_COMMON,
                .pio_mask       = ATA_PIO4,
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &ahci_vt8251_ops,
        },
};

static const struct pci_device_id ahci_pci_tbl[] = {
        /* Intel */
        { PCI_VDEVICE(INTEL, 0x2652), board_ahci }, /* ICH6 */
        { PCI_VDEVICE(INTEL, 0x2653), board_ahci }, /* ICH6M */
        { PCI_VDEVICE(INTEL, 0x27c1), board_ahci }, /* ICH7 */
        { PCI_VDEVICE(INTEL, 0x27c5), board_ahci }, /* ICH7M */
        { PCI_VDEVICE(INTEL, 0x27c3), board_ahci }, /* ICH7R */
        { PCI_VDEVICE(AL, 0x5288), board_ahci_ign_iferr }, /* ULi M5288 */
        { PCI_VDEVICE(INTEL, 0x2681), board_ahci }, /* ESB2 */
        { PCI_VDEVICE(INTEL, 0x2682), board_ahci }, /* ESB2 */
        { PCI_VDEVICE(INTEL, 0x2683), board_ahci }, /* ESB2 */
        { PCI_VDEVICE(INTEL, 0x27c6), board_ahci }, /* ICH7-M DH */
        { PCI_VDEVICE(INTEL, 0x2821), board_ahci }, /* ICH8 */
        { PCI_VDEVICE(INTEL, 0x2822), board_ahci_nosntf }, /* ICH8 */
        { PCI_VDEVICE(INTEL, 0x2824), board_ahci }, /* ICH8 */
        { PCI_VDEVICE(INTEL, 0x2829), board_ahci }, /* ICH8M */
        { PCI_VDEVICE(INTEL, 0x282a), board_ahci }, /* ICH8M */
        { PCI_VDEVICE(INTEL, 0x2922), board_ahci }, /* ICH9 */
        { PCI_VDEVICE(INTEL, 0x2923), board_ahci }, /* ICH9 */
        { PCI_VDEVICE(INTEL, 0x2924), board_ahci }, /* ICH9 */
        { PCI_VDEVICE(INTEL, 0x2925), board_ahci }, /* ICH9 */
        { PCI_VDEVICE(INTEL, 0x2927), board_ahci }, /* ICH9 */
        { PCI_VDEVICE(INTEL, 0x2929), board_ahci }, /* ICH9M */
        { PCI_VDEVICE(INTEL, 0x292a), board_ahci }, /* ICH9M */
        { PCI_VDEVICE(INTEL, 0x292b), board_ahci }, /* ICH9M */
        { PCI_VDEVICE(INTEL, 0x292c), board_ahci }, /* ICH9M */
        { PCI_VDEVICE(INTEL, 0x292f), board_ahci }, /* ICH9M */
        { PCI_VDEVICE(INTEL, 0x294d), board_ahci }, /* ICH9 */
        { PCI_VDEVICE(INTEL, 0x294e), board_ahci }, /* ICH9M */
        { PCI_VDEVICE(INTEL, 0x502a), board_ahci }, /* Tolapai */
        { PCI_VDEVICE(INTEL, 0x502b), board_ahci }, /* Tolapai */
        { PCI_VDEVICE(INTEL, 0x3a05), board_ahci }, /* ICH10 */
        { PCI_VDEVICE(INTEL, 0x3a22), board_ahci }, /* ICH10 */
        { PCI_VDEVICE(INTEL, 0x3a25), board_ahci }, /* ICH10 */
        { PCI_VDEVICE(INTEL, 0x3b22), board_ahci }, /* PCH AHCI */
        { PCI_VDEVICE(INTEL, 0x3b23), board_ahci }, /* PCH AHCI */
        { PCI_VDEVICE(INTEL, 0x3b24), board_ahci }, /* PCH RAID */
        { PCI_VDEVICE(INTEL, 0x3b25), board_ahci }, /* PCH RAID */
        { PCI_VDEVICE(INTEL, 0x3b29), board_ahci }, /* PCH AHCI */
        { PCI_VDEVICE(INTEL, 0x3b2b), board_ahci }, /* PCH RAID */
        { PCI_VDEVICE(INTEL, 0x3b2c), board_ahci }, /* PCH RAID */
        { PCI_VDEVICE(INTEL, 0x3b2f), board_ahci }, /* PCH AHCI */
        { PCI_VDEVICE(INTEL, 0x19b0), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19b1), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19b2), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19b3), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19b4), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19b5), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19b6), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19b7), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19bE), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19bF), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19c0), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19c1), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19c2), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19c3), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19c4), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19c5), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19c6), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19c7), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19cE), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x19cF), board_ahci }, /* DNV AHCI */
        { PCI_VDEVICE(INTEL, 0x1c02), board_ahci }, /* CPT AHCI */
        { PCI_VDEVICE(INTEL, 0x1c03), board_ahci }, /* CPT AHCI */
        { PCI_VDEVICE(INTEL, 0x1c04), board_ahci }, /* CPT RAID */
        { PCI_VDEVICE(INTEL, 0x1c05), board_ahci }, /* CPT RAID */
        { PCI_VDEVICE(INTEL, 0x1c06), board_ahci }, /* CPT RAID */
        { PCI_VDEVICE(INTEL, 0x1c07), board_ahci }, /* CPT RAID */
        { PCI_VDEVICE(INTEL, 0x1d02), board_ahci }, /* PBG AHCI */
        { PCI_VDEVICE(INTEL, 0x1d04), board_ahci }, /* PBG RAID */
        { PCI_VDEVICE(INTEL, 0x1d06), board_ahci }, /* PBG RAID */
        { PCI_VDEVICE(INTEL, 0x2826), board_ahci }, /* PBG RAID */
        { PCI_VDEVICE(INTEL, 0x2323), board_ahci }, /* DH89xxCC AHCI */
        { PCI_VDEVICE(INTEL, 0x1e02), board_ahci }, /* Panther Point AHCI */
        { PCI_VDEVICE(INTEL, 0x1e03), board_ahci }, /* Panther Point AHCI */
        { PCI_VDEVICE(INTEL, 0x1e04), board_ahci }, /* Panther Point RAID */
        { PCI_VDEVICE(INTEL, 0x1e05), board_ahci }, /* Panther Point RAID */
        { PCI_VDEVICE(INTEL, 0x1e06), board_ahci }, /* Panther Point RAID */
        { PCI_VDEVICE(INTEL, 0x1e07), board_ahci }, /* Panther Point RAID */
        { PCI_VDEVICE(INTEL, 0x1e0e), board_ahci }, /* Panther Point RAID */
        { PCI_VDEVICE(INTEL, 0x8c02), board_ahci }, /* Lynx Point AHCI */
        { PCI_VDEVICE(INTEL, 0x8c03), board_ahci }, /* Lynx Point AHCI */
        { PCI_VDEVICE(INTEL, 0x8c04), board_ahci }, /* Lynx Point RAID */
        { PCI_VDEVICE(INTEL, 0x8c05), board_ahci }, /* Lynx Point RAID */
        { PCI_VDEVICE(INTEL, 0x8c06), board_ahci }, /* Lynx Point RAID */
        { PCI_VDEVICE(INTEL, 0x8c07), board_ahci }, /* Lynx Point RAID */
        { PCI_VDEVICE(INTEL, 0x8c0e), board_ahci }, /* Lynx Point RAID */
        { PCI_VDEVICE(INTEL, 0x8c0f), board_ahci }, /* Lynx Point RAID */
        { PCI_VDEVICE(INTEL, 0x9c02), board_ahci }, /* Lynx Point-LP AHCI */
        { PCI_VDEVICE(INTEL, 0x9c03), board_ahci }, /* Lynx Point-LP AHCI */
        { PCI_VDEVICE(INTEL, 0x9c04), board_ahci }, /* Lynx Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x9c05), board_ahci }, /* Lynx Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x9c06), board_ahci }, /* Lynx Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x9c07), board_ahci }, /* Lynx Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x9c0e), board_ahci }, /* Lynx Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x9c0f), board_ahci }, /* Lynx Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x1f22), board_ahci }, /* Avoton AHCI */
        { PCI_VDEVICE(INTEL, 0x1f23), board_ahci }, /* Avoton AHCI */
        { PCI_VDEVICE(INTEL, 0x1f24), board_ahci }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f25), board_ahci }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f26), board_ahci }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f27), board_ahci }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f2e), board_ahci }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f2f), board_ahci }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f32), board_ahci_avn }, /* Avoton AHCI */
        { PCI_VDEVICE(INTEL, 0x1f33), board_ahci_avn }, /* Avoton AHCI */
        { PCI_VDEVICE(INTEL, 0x1f34), board_ahci_avn }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f35), board_ahci_avn }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f36), board_ahci_avn }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f37), board_ahci_avn }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f3e), board_ahci_avn }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x1f3f), board_ahci_avn }, /* Avoton RAID */
        { PCI_VDEVICE(INTEL, 0x2823), board_ahci }, /* Wellsburg RAID */
        { PCI_VDEVICE(INTEL, 0x2827), board_ahci }, /* Wellsburg RAID */
        { PCI_VDEVICE(INTEL, 0x8d02), board_ahci }, /* Wellsburg AHCI */
        { PCI_VDEVICE(INTEL, 0x8d04), board_ahci }, /* Wellsburg RAID */
        { PCI_VDEVICE(INTEL, 0x8d06), board_ahci }, /* Wellsburg RAID */
        { PCI_VDEVICE(INTEL, 0x8d0e), board_ahci }, /* Wellsburg RAID */
        { PCI_VDEVICE(INTEL, 0x8d62), board_ahci }, /* Wellsburg AHCI */
        { PCI_VDEVICE(INTEL, 0x8d64), board_ahci }, /* Wellsburg RAID */
        { PCI_VDEVICE(INTEL, 0x8d66), board_ahci }, /* Wellsburg RAID */
        { PCI_VDEVICE(INTEL, 0x8d6e), board_ahci }, /* Wellsburg RAID */
        { PCI_VDEVICE(INTEL, 0x23a3), board_ahci }, /* Coleto Creek AHCI */
        { PCI_VDEVICE(INTEL, 0x9c83), board_ahci }, /* Wildcat Point-LP AHCI */
        { PCI_VDEVICE(INTEL, 0x9c85), board_ahci }, /* Wildcat Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x9c87), board_ahci }, /* Wildcat Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x9c8f), board_ahci }, /* Wildcat Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x8c82), board_ahci }, /* 9 Series AHCI */
        { PCI_VDEVICE(INTEL, 0x8c83), board_ahci }, /* 9 Series AHCI */
        { PCI_VDEVICE(INTEL, 0x8c84), board_ahci }, /* 9 Series RAID */
        { PCI_VDEVICE(INTEL, 0x8c85), board_ahci }, /* 9 Series RAID */
        { PCI_VDEVICE(INTEL, 0x8c86), board_ahci }, /* 9 Series RAID */
        { PCI_VDEVICE(INTEL, 0x8c87), board_ahci }, /* 9 Series RAID */
        { PCI_VDEVICE(INTEL, 0x8c8e), board_ahci }, /* 9 Series RAID */
        { PCI_VDEVICE(INTEL, 0x8c8f), board_ahci }, /* 9 Series RAID */
        { PCI_VDEVICE(INTEL, 0x9d03), board_ahci }, /* Sunrise Point-LP AHCI */
        { PCI_VDEVICE(INTEL, 0x9d05), board_ahci }, /* Sunrise Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0x9d07), board_ahci }, /* Sunrise Point-LP RAID */
        { PCI_VDEVICE(INTEL, 0xa102), board_ahci }, /* Sunrise Point-H AHCI */
        { PCI_VDEVICE(INTEL, 0xa103), board_ahci }, /* Sunrise Point-H AHCI */
        { PCI_VDEVICE(INTEL, 0xa105), board_ahci }, /* Sunrise Point-H RAID */
        { PCI_VDEVICE(INTEL, 0xa106), board_ahci }, /* Sunrise Point-H RAID */
        { PCI_VDEVICE(INTEL, 0xa107), board_ahci }, /* Sunrise Point-H RAID */
        { PCI_VDEVICE(INTEL, 0xa10f), board_ahci }, /* Sunrise Point-H RAID */
        { PCI_VDEVICE(INTEL, 0x2822), board_ahci }, /* Lewisburg RAID*/
        { PCI_VDEVICE(INTEL, 0x2823), board_ahci }, /* Lewisburg AHCI*/
        { PCI_VDEVICE(INTEL, 0x2826), board_ahci }, /* Lewisburg RAID*/
        { PCI_VDEVICE(INTEL, 0x2827), board_ahci }, /* Lewisburg RAID*/
        { PCI_VDEVICE(INTEL, 0xa182), board_ahci }, /* Lewisburg AHCI*/
        { PCI_VDEVICE(INTEL, 0xa186), board_ahci }, /* Lewisburg RAID*/
        { PCI_VDEVICE(INTEL, 0xa1d2), board_ahci }, /* Lewisburg RAID*/
        { PCI_VDEVICE(INTEL, 0xa1d6), board_ahci }, /* Lewisburg RAID*/
        { PCI_VDEVICE(INTEL, 0xa202), board_ahci }, /* Lewisburg AHCI*/
        { PCI_VDEVICE(INTEL, 0xa206), board_ahci }, /* Lewisburg RAID*/
        { PCI_VDEVICE(INTEL, 0xa252), board_ahci }, /* Lewisburg RAID*/
        { PCI_VDEVICE(INTEL, 0xa256), board_ahci }, /* Lewisburg RAID*/

        /* JMicron 360/1/3/5/6, match class to avoid IDE function */
        { PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
          PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff, board_ahci_ign_iferr },
        /* JMicron 362B and 362C have an AHCI function with IDE class code */
        { PCI_VDEVICE(JMICRON, 0x2362), board_ahci_ign_iferr },
        { PCI_VDEVICE(JMICRON, 0x236f), board_ahci_ign_iferr },
        /* May need to update quirk_jmicron_async_suspend() for additions */

        /* ATI */
        { PCI_VDEVICE(ATI, 0x4380), board_ahci_sb600 }, /* ATI SB600 */
        { PCI_VDEVICE(ATI, 0x4390), board_ahci_sb700 }, /* ATI SB700/800 */
        { PCI_VDEVICE(ATI, 0x4391), board_ahci_sb700 }, /* ATI SB700/800 */
        { PCI_VDEVICE(ATI, 0x4392), board_ahci_sb700 }, /* ATI SB700/800 */
        { PCI_VDEVICE(ATI, 0x4393), board_ahci_sb700 }, /* ATI SB700/800 */
        { PCI_VDEVICE(ATI, 0x4394), board_ahci_sb700 }, /* ATI SB700/800 */
        { PCI_VDEVICE(ATI, 0x4395), board_ahci_sb700 }, /* ATI SB700/800 */

        /* AMD */
        { PCI_VDEVICE(AMD, 0x7800), board_ahci }, /* AMD Hudson-2 */
        { PCI_VDEVICE(AMD, 0x7900), board_ahci }, /* AMD CZ */
        /* AMD is using RAID class only for ahci controllers */
        { PCI_VENDOR_ID_AMD, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
          PCI_CLASS_STORAGE_RAID << 8, 0xffffff, board_ahci },

        /* VIA */
        { PCI_VDEVICE(VIA, 0x3349), board_ahci_vt8251 }, /* VIA VT8251 */
        { PCI_VDEVICE(VIA, 0x6287), board_ahci_vt8251 }, /* VIA VT8251 */

        /* NVIDIA */
        { PCI_VDEVICE(NVIDIA, 0x044c), board_ahci_mcp65 },      /* MCP65 */
        { PCI_VDEVICE(NVIDIA, 0x044d), board_ahci_mcp65 },      /* MCP65 */
        { PCI_VDEVICE(NVIDIA, 0x044e), board_ahci_mcp65 },      /* MCP65 */
        { PCI_VDEVICE(NVIDIA, 0x044f), board_ahci_mcp65 },      /* MCP65 */
        { PCI_VDEVICE(NVIDIA, 0x045c), board_ahci_mcp65 },      /* MCP65 */
        { PCI_VDEVICE(NVIDIA, 0x045d), board_ahci_mcp65 },      /* MCP65 */
        { PCI_VDEVICE(NVIDIA, 0x045e), board_ahci_mcp65 },      /* MCP65 */
        { PCI_VDEVICE(NVIDIA, 0x045f), board_ahci_mcp65 },      /* MCP65 */
        { PCI_VDEVICE(NVIDIA, 0x0550), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0551), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0552), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0553), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0554), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0555), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0556), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0557), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0558), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0559), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x055a), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x055b), board_ahci_mcp67 },      /* MCP67 */
        { PCI_VDEVICE(NVIDIA, 0x0580), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x0581), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x0582), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x0583), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x0584), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x0585), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x0586), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x0587), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x0588), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x0589), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x058a), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x058b), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x058c), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x058d), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x058e), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x058f), board_ahci_mcp_linux },  /* Linux ID */
        { PCI_VDEVICE(NVIDIA, 0x07f0), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07f1), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07f2), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07f3), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07f4), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07f5), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07f6), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07f7), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07f8), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07f9), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07fa), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x07fb), board_ahci_mcp73 },      /* MCP73 */
        { PCI_VDEVICE(NVIDIA, 0x0ad0), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ad1), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ad2), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ad3), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ad4), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ad5), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ad6), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ad7), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ad8), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ad9), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ada), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0adb), board_ahci_mcp77 },      /* MCP77 */
        { PCI_VDEVICE(NVIDIA, 0x0ab4), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0ab5), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0ab6), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0ab7), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0ab8), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0ab9), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0aba), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0abb), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0abc), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0abd), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0abe), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0abf), board_ahci_mcp79 },      /* MCP79 */
        { PCI_VDEVICE(NVIDIA, 0x0d84), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d85), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d86), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d87), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d88), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d89), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d8a), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d8b), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d8c), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d8d), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d8e), board_ahci_mcp89 },      /* MCP89 */
        { PCI_VDEVICE(NVIDIA, 0x0d8f), board_ahci_mcp89 },      /* MCP89 */

        /* SiS */
        { PCI_VDEVICE(SI, 0x1184), board_ahci },                /* SiS 966 */
        { PCI_VDEVICE(SI, 0x1185), board_ahci },                /* SiS 968 */
        { PCI_VDEVICE(SI, 0x0186), board_ahci },                /* SiS 968 */

        /* ST Microelectronics */
        { PCI_VDEVICE(STMICRO, 0xCC06), board_ahci },           /* ST ConneXt */

        /* Marvell */
        { PCI_VDEVICE(MARVELL, 0x6145), board_ahci_mv },        /* 6145 */
        { PCI_VDEVICE(MARVELL, 0x6121), board_ahci_mv },        /* 6121 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x9123),
          .class = PCI_CLASS_STORAGE_SATA_AHCI,
          .class_mask = 0xffffff,
          .driver_data = board_ahci_yes_fbs },                  /* 88se9128 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x9125),
          .driver_data = board_ahci_yes_fbs },                  /* 88se9125 */
        { PCI_DEVICE_SUB(PCI_VENDOR_ID_MARVELL_EXT, 0x9178,
                         PCI_VENDOR_ID_MARVELL_EXT, 0x9170),
          .driver_data = board_ahci_yes_fbs },                  /* 88se9170 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x917a),
          .driver_data = board_ahci_yes_fbs },                  /* 88se9172 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x9172),
          .driver_data = board_ahci_yes_fbs },                  /* 88se9182 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x9182),
          .driver_data = board_ahci_yes_fbs },                  /* 88se9172 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x9192),
          .driver_data = board_ahci_yes_fbs },                  /* 88se9172 on some Gigabyte */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x91a0),
          .driver_data = board_ahci_yes_fbs },
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x91a2),        /* 88se91a2 */
          .driver_data = board_ahci_yes_fbs },
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x91a3),
          .driver_data = board_ahci_yes_fbs },
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL_EXT, 0x9230),
          .driver_data = board_ahci_yes_fbs },
        { PCI_DEVICE(PCI_VENDOR_ID_TTI, 0x0642),
          .driver_data = board_ahci_yes_fbs },

        /* Promise */
        { PCI_VDEVICE(PROMISE, 0x3f20), board_ahci },   /* PDC42819 */
        { PCI_VDEVICE(PROMISE, 0x3781), board_ahci },   /* FastTrak TX8660 ahci-mode */

        /* Asmedia */
        { PCI_VDEVICE(ASMEDIA, 0x0601), board_ahci },   /* ASM1060 */
        { PCI_VDEVICE(ASMEDIA, 0x0602), board_ahci },   /* ASM1060 */
        { PCI_VDEVICE(ASMEDIA, 0x0611), board_ahci },   /* ASM1061 */
        { PCI_VDEVICE(ASMEDIA, 0x0612), board_ahci },   /* ASM1062 */

        /*
         * Samsung SSDs found on some macbooks.  NCQ times out if MSI is
         * enabled.  https://bugzilla.kernel.org/show_bug.cgi?id=60731
         */
        { PCI_VDEVICE(SAMSUNG, 0x1600), board_ahci_nomsi },
        { PCI_VDEVICE(SAMSUNG, 0xa800), board_ahci_nomsi },

        /* Enmotus */
        { PCI_DEVICE(0x1c44, 0x8000), board_ahci },

        /* Generic, PCI class code for AHCI */
        { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
          PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff, board_ahci },

        { }     /* terminate list */
};

static const struct dev_pm_ops ahci_pci_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(ahci_pci_device_suspend, ahci_pci_device_resume)
        SET_RUNTIME_PM_OPS(ahci_pci_device_runtime_suspend,
                           ahci_pci_device_runtime_resume, NULL)
};

static struct pci_driver ahci_pci_driver = {
        .name                   = DRV_NAME,
        .id_table               = ahci_pci_tbl,
        .probe                  = ahci_init_one,
        .remove                 = ahci_remove_one,
        .driver = {
                .pm             = &ahci_pci_pm_ops,
        },
};

#if defined(CONFIG_PATA_MARVELL) || defined(CONFIG_PATA_MARVELL_MODULE)
static int marvell_enable;
#else
static int marvell_enable = 1;
#endif
module_param(marvell_enable, int, 0644);
MODULE_PARM_DESC(marvell_enable, "Marvell SATA via AHCI (1 = enabled)");


static void ahci_pci_save_initial_config(struct pci_dev *pdev,
                                         struct ahci_host_priv *hpriv)
{
        if (pdev->vendor == PCI_VENDOR_ID_JMICRON && pdev->device == 0x2361) {
                dev_info(&pdev->dev, "JMB361 has only one port\n");
                hpriv->force_port_map = 1;
        }

        /*
         * Temporary Marvell 6145 hack: PATA port presence
         * is asserted through the standard AHCI port
         * presence register, as bit 4 (counting from 0)
         */
        if (hpriv->flags & AHCI_HFLAG_MV_PATA) {
                if (pdev->device == 0x6121)
                        hpriv->mask_port_map = 0x3;
                else
                        hpriv->mask_port_map = 0xf;
                dev_info(&pdev->dev,
                          "Disabling your PATA port. Use the boot option 'ahci.marvell_enable=0' to avoid this.\n");
        }

        ahci_save_initial_config(&pdev->dev, hpriv);
}

static int ahci_pci_reset_controller(struct ata_host *host)
{
        struct pci_dev *pdev = to_pci_dev(host->dev);

        ahci_reset_controller(host);

        if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
                struct ahci_host_priv *hpriv = host->private_data;
                u16 tmp16;

                /* configure PCS */
                pci_read_config_word(pdev, 0x92, &tmp16);
                if ((tmp16 & hpriv->port_map) != hpriv->port_map) {
                        tmp16 |= hpriv->port_map;
                        pci_write_config_word(pdev, 0x92, tmp16);
                }
        }

        return 0;
}

static void ahci_pci_init_controller(struct ata_host *host)
{
        struct ahci_host_priv *hpriv = host->private_data;
        struct pci_dev *pdev = to_pci_dev(host->dev);
        void __iomem *port_mmio;
        u32 tmp;
        int mv;

        if (hpriv->flags & AHCI_HFLAG_MV_PATA) {
                if (pdev->device == 0x6121)
                        mv = 2;
                else
                        mv = 4;
                port_mmio = __ahci_port_base(host, mv);

                writel(0, port_mmio + PORT_IRQ_MASK);

                /* clear port IRQ */
                tmp = readl(port_mmio + PORT_IRQ_STAT);
                VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
                if (tmp)
                        writel(tmp, port_mmio + PORT_IRQ_STAT);
        }

        ahci_init_controller(host);
}

static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
                                 unsigned long deadline)
{
        struct ata_port *ap = link->ap;
        struct ahci_host_priv *hpriv = ap->host->private_data;
        bool online;
        int rc;

        DPRINTK("ENTER\n");

        ahci_stop_engine(ap);

        rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
                                 deadline, &online, NULL);

        hpriv->start_engine(ap);

        DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);

        /* vt8251 doesn't clear BSY on signature FIS reception,
         * request follow-up softreset.
         */
        return online ? -EAGAIN : rc;
}

static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
                                unsigned long deadline)
{
        struct ata_port *ap = link->ap;
        struct ahci_port_priv *pp = ap->private_data;
        struct ahci_host_priv *hpriv = ap->host->private_data;
        u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
        struct ata_taskfile tf;
        bool online;
        int rc;

        ahci_stop_engine(ap);

        /* clear D2H reception area to properly wait for D2H FIS */
        ata_tf_init(link->device, &tf);
        tf.command = ATA_BUSY;
        ata_tf_to_fis(&tf, 0, 0, d2h_fis);

        rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
                                 deadline, &online, NULL);

        hpriv->start_engine(ap);

        /* The pseudo configuration device on SIMG4726 attached to
         * ASUS P5W-DH Deluxe doesn't send signature FIS after
         * hardreset if no device is attached to the first downstream
         * port && the pseudo device locks up on SRST w/ PMP==0.  To
         * work around this, wait for !BSY only briefly.  If BSY isn't
         * cleared, perform CLO and proceed to IDENTIFY (achieved by
         * ATA_LFLAG_NO_SRST and ATA_LFLAG_ASSUME_ATA).
         *
         * Wait for two seconds.  Devices attached to downstream port
         * which can't process the following IDENTIFY after this will
         * have to be reset again.  For most cases, this should
         * suffice while making probing snappish enough.
         */
        if (online) {
                rc = ata_wait_after_reset(link, jiffies + 2 * HZ,
                                          ahci_check_ready);
                if (rc)
                        ahci_kick_engine(ap);
        }
        return rc;
}

/*
 * ahci_avn_hardreset - attempt more aggressive recovery of Avoton ports.
 *
 * It has been observed with some SSDs that the timing of events in the
 * link synchronization phase can leave the port in a state that can not
 * be recovered by a SATA-hard-reset alone.  The failing signature is
 * SStatus.DET stuck at 1 ("Device presence detected but Phy
 * communication not established").  It was found that unloading and
 * reloading the driver when this problem occurs allows the drive
 * connection to be recovered (DET advanced to 0x3).  The critical
 * component of reloading the driver is that the port state machines are
 * reset by bouncing "port enable" in the AHCI PCS configuration
 * register.  So, reproduce that effect by bouncing a port whenever we
 * see DET==1 after a reset.
 */
static int ahci_avn_hardreset(struct ata_link *link, unsigned int *class,
                              unsigned long deadline)
{
        const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
        struct ata_port *ap = link->ap;
        struct ahci_port_priv *pp = ap->private_data;
        struct ahci_host_priv *hpriv = ap->host->private_data;
        u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
        unsigned long tmo = deadline - jiffies;
        struct ata_taskfile tf;
        bool online;
        int rc, i;

        DPRINTK("ENTER\n");

        ahci_stop_engine(ap);

        for (i = 0; i < 2; i++) {
                u16 val;
                u32 sstatus;
                int port = ap->port_no;
                struct ata_host *host = ap->host;
                struct pci_dev *pdev = to_pci_dev(host->dev);

                /* clear D2H reception area to properly wait for D2H FIS */
                ata_tf_init(link->device, &tf);
                tf.command = ATA_BUSY;
                ata_tf_to_fis(&tf, 0, 0, d2h_fis);

                rc = sata_link_hardreset(link, timing, deadline, &online,
                                ahci_check_ready);

                if (sata_scr_read(link, SCR_STATUS, &sstatus) != 0 ||
                                (sstatus & 0xf) != 1)
                        break;

                ata_link_printk(link, KERN_INFO, "avn bounce port%d\n",
                                port);

                pci_read_config_word(pdev, 0x92, &val);
                val &= ~(1 << port);
                pci_write_config_word(pdev, 0x92, val);
                ata_msleep(ap, 1000);
                val |= 1 << port;
                pci_write_config_word(pdev, 0x92, val);
                deadline += tmo;
        }

        hpriv->start_engine(ap);

        if (online)
                *class = ahci_dev_classify(ap);

        DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
        return rc;
}


#ifdef CONFIG_PM
static void ahci_pci_disable_interrupts(struct ata_host *host)
{
        struct ahci_host_priv *hpriv = host->private_data;
        void __iomem *mmio = hpriv->mmio;
        u32 ctl;

        /* AHCI spec rev1.1 section 8.3.3:
         * Software must disable interrupts prior to requesting a
         * transition of the HBA to D3 state.
         */
        ctl = readl(mmio + HOST_CTL);
        ctl &= ~HOST_IRQ_EN;
        writel(ctl, mmio + HOST_CTL);
        readl(mmio + HOST_CTL); /* flush */
}

static int ahci_pci_device_runtime_suspend(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct ata_host *host = pci_get_drvdata(pdev);

        ahci_pci_disable_interrupts(host);
        return 0;
}

static int ahci_pci_device_runtime_resume(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct ata_host *host = pci_get_drvdata(pdev);
        int rc;

        rc = ahci_pci_reset_controller(host);
        if (rc)
                return rc;
        ahci_pci_init_controller(host);
        return 0;
}

#ifdef CONFIG_PM_SLEEP
static int ahci_pci_device_suspend(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct ata_host *host = pci_get_drvdata(pdev);
        struct ahci_host_priv *hpriv = host->private_data;

        if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
                dev_err(&pdev->dev,
                        "BIOS update required for suspend/resume\n");
                return -EIO;
        }

        ahci_pci_disable_interrupts(host);
        return ata_host_suspend(host, PMSG_SUSPEND);
}

static int ahci_pci_device_resume(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct ata_host *host = pci_get_drvdata(pdev);
        int rc;

        /* Apple BIOS helpfully mangles the registers on resume */
        if (is_mcp89_apple(pdev))
                ahci_mcp89_apple_enable(pdev);

        if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
                rc = ahci_pci_reset_controller(host);
                if (rc)
                        return rc;

                ahci_pci_init_controller(host);
        }

        ata_host_resume(host);

        return 0;
}
#endif

#endif /* CONFIG_PM */

static int ahci_configure_dma_masks(struct pci_dev *pdev, int using_dac)
{
        int rc;

        /*
         * If the device fixup already set the dma_mask to some non-standard
         * value, don't extend it here. This happens on STA2X11, for example.
         */
        if (pdev->dma_mask && pdev->dma_mask < DMA_BIT_MASK(32))
                return 0;

        if (using_dac &&
            !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\n");
                                return rc;
                        }
                }
        } else {
                rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
                if (rc) {
                        dev_err(&pdev->dev, "32-bit DMA enable failed\n");
                        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\n");
                        return rc;
                }
        }
        return 0;
}

static void ahci_pci_print_info(struct ata_host *host)
{
        struct pci_dev *pdev = to_pci_dev(host->dev);
        u16 cc;
        const char *scc_s;

        pci_read_config_word(pdev, 0x0a, &cc);
        if (cc == PCI_CLASS_STORAGE_IDE)
                scc_s = "IDE";
        else if (cc == PCI_CLASS_STORAGE_SATA)
                scc_s = "SATA";
        else if (cc == PCI_CLASS_STORAGE_RAID)
                scc_s = "RAID";
        else
                scc_s = "unknown";

        ahci_print_info(host, scc_s);
}

/* On ASUS P5W DH Deluxe, the second port of PCI device 00:1f.2 is
 * hardwired to on-board SIMG 4726.  The chipset is ICH8 and doesn't
 * support PMP and the 4726 either directly exports the device
 * attached to the first downstream port or acts as a hardware storage
 * controller and emulate a single ATA device (can be RAID 0/1 or some
 * other configuration).
 *
 * When there's no device attached to the first downstream port of the
 * 4726, "Config Disk" appears, which is a pseudo ATA device to
 * configure the 4726.  However, ATA emulation of the device is very
 * lame.  It doesn't send signature D2H Reg FIS after the initial
 * hardreset, pukes on SRST w/ PMP==0 and has bunch of other issues.
 *
 * The following function works around the problem by always using
 * hardreset on the port and not depending on receiving signature FIS
 * afterward.  If signature FIS isn't received soon, ATA class is
 * assumed without follow-up softreset.
 */
static void ahci_p5wdh_workaround(struct ata_host *host)
{
        static const struct dmi_system_id sysids[] = {
                {
                        .ident = "P5W DH Deluxe",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR,
                                          "ASUSTEK COMPUTER INC"),
                                DMI_MATCH(DMI_PRODUCT_NAME, "P5W DH Deluxe"),
                        },
                },
                { }
        };
        struct pci_dev *pdev = to_pci_dev(host->dev);

        if (pdev->bus->number == 0 && pdev->devfn == PCI_DEVFN(0x1f, 2) &&
            dmi_check_system(sysids)) {
                struct ata_port *ap = host->ports[1];

                dev_info(&pdev->dev,
                         "enabling ASUS P5W DH Deluxe on-board SIMG4726 workaround\n");

                ap->ops = &ahci_p5wdh_ops;
                ap->link.flags |= ATA_LFLAG_NO_SRST | ATA_LFLAG_ASSUME_ATA;
        }
}

/*
 * Macbook7,1 firmware forcibly disables MCP89 AHCI and changes PCI ID when
 * booting in BIOS compatibility mode.  We restore the registers but not ID.
 */
static void ahci_mcp89_apple_enable(struct pci_dev *pdev)
{
        u32 val;

        printk(KERN_INFO "ahci: enabling MCP89 AHCI mode\n");

        pci_read_config_dword(pdev, 0xf8, &val);
        val |= 1 << 0x1b;
        /* the following changes the device ID, but appears not to affect function */
        /* val = (val & ~0xf0000000) | 0x80000000; */
        pci_write_config_dword(pdev, 0xf8, val);

        pci_read_config_dword(pdev, 0x54c, &val);
        val |= 1 << 0xc;
        pci_write_config_dword(pdev, 0x54c, val);

        pci_read_config_dword(pdev, 0x4a4, &val);
        val &= 0xff;
        val |= 0x01060100;
        pci_write_config_dword(pdev, 0x4a4, val);

        pci_read_config_dword(pdev, 0x54c, &val);
        val &= ~(1 << 0xc);
        pci_write_config_dword(pdev, 0x54c, val);

        pci_read_config_dword(pdev, 0xf8, &val);
        val &= ~(1 << 0x1b);
        pci_write_config_dword(pdev, 0xf8, val);
}

static bool is_mcp89_apple(struct pci_dev *pdev)
{
        return pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
                pdev->device == PCI_DEVICE_ID_NVIDIA_NFORCE_MCP89_SATA &&
                pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE &&
                pdev->subsystem_device == 0xcb89;
}

/* only some SB600 ahci controllers can do 64bit DMA */
static bool ahci_sb600_enable_64bit(struct pci_dev *pdev)
{
        static const struct dmi_system_id sysids[] = {
                /*
                 * The oldest version known to be broken is 0901 and
                 * working is 1501 which was released on 2007-10-26.
                 * Enable 64bit DMA on 1501 and anything newer.
                 *
                 * Please read bko#9412 for more info.
                 */
                {
                        .ident = "ASUS M2A-VM",
                        .matches = {
                                DMI_MATCH(DMI_BOARD_VENDOR,
                                          "ASUSTeK Computer INC."),
                                DMI_MATCH(DMI_BOARD_NAME, "M2A-VM"),
                        },
                        .driver_data = "20071026",      /* yyyymmdd */
                },
                /*
                 * All BIOS versions for the MSI K9A2 Platinum (MS-7376)
                 * support 64bit DMA.
                 *
                 * BIOS versions earlier than 1.5 had the Manufacturer DMI
                 * fields as "MICRO-STAR INTERANTIONAL CO.,LTD".
                 * This spelling mistake was fixed in BIOS version 1.5, so
                 * 1.5 and later have the Manufacturer as
                 * "MICRO-STAR INTERNATIONAL CO.,LTD".
                 * So try to match on DMI_BOARD_VENDOR of "MICRO-STAR INTER".
                 *
                 * BIOS versions earlier than 1.9 had a Board Product Name
                 * DMI field of "MS-7376". This was changed to be
                 * "K9A2 Platinum (MS-7376)" in version 1.9, but we can still
                 * match on DMI_BOARD_NAME of "MS-7376".
                 */
                {
                        .ident = "MSI K9A2 Platinum",
                        .matches = {
                                DMI_MATCH(DMI_BOARD_VENDOR,
                                          "MICRO-STAR INTER"),
                                DMI_MATCH(DMI_BOARD_NAME, "MS-7376"),
                        },
                },
                /*
                 * All BIOS versions for the MSI K9AGM2 (MS-7327) support
                 * 64bit DMA.
                 *
                 * This board also had the typo mentioned above in the
                 * Manufacturer DMI field (fixed in BIOS version 1.5), so
                 * match on DMI_BOARD_VENDOR of "MICRO-STAR INTER" again.
                 */
                {
                        .ident = "MSI K9AGM2",
                        .matches = {
                                DMI_MATCH(DMI_BOARD_VENDOR,
                                          "MICRO-STAR INTER"),
                                DMI_MATCH(DMI_BOARD_NAME, "MS-7327"),
                        },
                },
                /*
                 * All BIOS versions for the Asus M3A support 64bit DMA.
                 * (all release versions from 0301 to 1206 were tested)
                 */
                {
                        .ident = "ASUS M3A",
                        .matches = {
                                DMI_MATCH(DMI_BOARD_VENDOR,
                                          "ASUSTeK Computer INC."),
                                DMI_MATCH(DMI_BOARD_NAME, "M3A"),
                        },
                },
                { }
        };
        const struct dmi_system_id *match;
        int year, month, date;
        char buf[9];

        match = dmi_first_match(sysids);
        if (pdev->bus->number != 0 || pdev->devfn != PCI_DEVFN(0x12, 0) ||
            !match)
                return false;

        if (!match->driver_data)
                goto enable_64bit;

        dmi_get_date(DMI_BIOS_DATE, &year, &month, &date);
        snprintf(buf, sizeof(buf), "%04d%02d%02d", year, month, date);

        if (strcmp(buf, match->driver_data) >= 0)
                goto enable_64bit;
        else {
                dev_warn(&pdev->dev,
                         "%s: BIOS too old, forcing 32bit DMA, update BIOS\n",
                         match->ident);
                return false;
        }

enable_64bit:
        dev_warn(&pdev->dev, "%s: enabling 64bit DMA\n", match->ident);
        return true;
}

static bool ahci_broken_system_poweroff(struct pci_dev *pdev)
{
        static const struct dmi_system_id broken_systems[] = {
                {
                        .ident = "HP Compaq nx6310",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                                DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6310"),
                        },
                        /* PCI slot number of the controller */
                        .driver_data = (void *)0x1FUL,
                },
                {
                        .ident = "HP Compaq 6720s",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                                DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6720s"),
                        },
                        /* PCI slot number of the controller */
                        .driver_data = (void *)0x1FUL,
                },

                { }     /* terminate list */
        };
        const struct dmi_system_id *dmi = dmi_first_match(broken_systems);

        if (dmi) {
                unsigned long slot = (unsigned long)dmi->driver_data;
                /* apply the quirk only to on-board controllers */
                return slot == PCI_SLOT(pdev->devfn);
        }

        return false;
}

static bool ahci_broken_suspend(struct pci_dev *pdev)
{
        static const struct dmi_system_id sysids[] = {
                /*
                 * On HP dv[4-6] and HDX18 with earlier BIOSen, link
                 * to the harddisk doesn't become online after
                 * resuming from STR.  Warn and fail suspend.
                 *
                 * http://bugzilla.kernel.org/show_bug.cgi?id=12276
                 *
                 * Use dates instead of versions to match as HP is
                 * apparently recycling both product and version
                 * strings.
                 *
                 * http://bugzilla.kernel.org/show_bug.cgi?id=15462
                 */
                {
                        .ident = "dv4",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                                DMI_MATCH(DMI_PRODUCT_NAME,
                                          "HP Pavilion dv4 Notebook PC"),
                        },
                        .driver_data = "20090105",      /* F.30 */
                },
                {
                        .ident = "dv5",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                                DMI_MATCH(DMI_PRODUCT_NAME,
                                          "HP Pavilion dv5 Notebook PC"),
                        },
                        .driver_data = "20090506",      /* F.16 */
                },
                {
                        .ident = "dv6",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                                DMI_MATCH(DMI_PRODUCT_NAME,
                                          "HP Pavilion dv6 Notebook PC"),
                        },
                        .driver_data = "20090423",      /* F.21 */
                },
                {
                        .ident = "HDX18",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
                                DMI_MATCH(DMI_PRODUCT_NAME,
                                          "HP HDX18 Notebook PC"),
                        },
                        .driver_data = "20090430",      /* F.23 */
                },
                /*
                 * Acer eMachines G725 has the same problem.  BIOS
                 * V1.03 is known to be broken.  V3.04 is known to
                 * work.  Between, there are V1.06, V2.06 and V3.03
                 * that we don't have much idea about.  For now,
                 * blacklist anything older than V3.04.
                 *
                 * http://bugzilla.kernel.org/show_bug.cgi?id=15104
                 */
                {
                        .ident = "G725",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR, "eMachines"),
                                DMI_MATCH(DMI_PRODUCT_NAME, "eMachines G725"),
                        },
                        .driver_data = "20091216",      /* V3.04 */
                },
                { }     /* terminate list */
        };
        const struct dmi_system_id *dmi = dmi_first_match(sysids);
        int year, month, date;
        char buf[9];

        if (!dmi || pdev->bus->number || pdev->devfn != PCI_DEVFN(0x1f, 2))
                return false;

        dmi_get_date(DMI_BIOS_DATE, &year, &month, &date);
        snprintf(buf, sizeof(buf), "%04d%02d%02d", year, month, date);

        return strcmp(buf, dmi->driver_data) < 0;
}

static bool ahci_broken_online(struct pci_dev *pdev)
{
#define ENCODE_BUSDEVFN(bus, slot, func)                        \
        (void *)(unsigned long)(((bus) << 8) | PCI_DEVFN((slot), (func)))
        static const struct dmi_system_id sysids[] = {
                /*
                 * There are several gigabyte boards which use
                 * SIMG5723s configured as hardware RAID.  Certain
                 * 5723 firmware revisions shipped there keep the link
                 * online but fail to answer properly to SRST or
                 * IDENTIFY when no device is attached downstream
                 * causing libata to retry quite a few times leading
                 * to excessive detection delay.
                 *
                 * As these firmwares respond to the second reset try
                 * with invalid device signature, considering unknown
                 * sig as offline works around the problem acceptably.
                 */
                {
                        .ident = "EP45-DQ6",
                        .matches = {
                                DMI_MATCH(DMI_BOARD_VENDOR,
                                          "Gigabyte Technology Co., Ltd."),
                                DMI_MATCH(DMI_BOARD_NAME, "EP45-DQ6"),
                        },
                        .driver_data = ENCODE_BUSDEVFN(0x0a, 0x00, 0),
                },
                {
                        .ident = "EP45-DS5",
                        .matches = {
                                DMI_MATCH(DMI_BOARD_VENDOR,
                                          "Gigabyte Technology Co., Ltd."),
                                DMI_MATCH(DMI_BOARD_NAME, "EP45-DS5"),
                        },
                        .driver_data = ENCODE_BUSDEVFN(0x03, 0x00, 0),
                },
                { }     /* terminate list */
        };
#undef ENCODE_BUSDEVFN
        const struct dmi_system_id *dmi = dmi_first_match(sysids);
        unsigned int val;

        if (!dmi)
                return false;

        val = (unsigned long)dmi->driver_data;

        return pdev->bus->number == (val >> 8) && pdev->devfn == (val & 0xff);
}

static bool ahci_broken_devslp(struct pci_dev *pdev)
{
        /* device with broken DEVSLP but still showing SDS capability */
        static const struct pci_device_id ids[] = {
                { PCI_VDEVICE(INTEL, 0x0f23)}, /* Valleyview SoC */
                {}
        };

        return pci_match_id(ids, pdev);
}

#ifdef CONFIG_ATA_ACPI
static void ahci_gtf_filter_workaround(struct ata_host *host)
{
        static const struct dmi_system_id sysids[] = {
                /*
                 * Aspire 3810T issues a bunch of SATA enable commands
                 * via _GTF including an invalid one and one which is
                 * rejected by the device.  Among the successful ones
                 * is FPDMA non-zero offset enable which when enabled
                 * only on the drive side leads to NCQ command
                 * failures.  Filter it out.
                 */
                {
                        .ident = "Aspire 3810T",
                        .matches = {
                                DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                                DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3810T"),
                        },
                        .driver_data = (void *)ATA_ACPI_FILTER_FPDMA_OFFSET,
                },
                { }
        };
        const struct dmi_system_id *dmi = dmi_first_match(sysids);
        unsigned int filter;
        int i;

        if (!dmi)
                return;

        filter = (unsigned long)dmi->driver_data;
        dev_info(host->dev, "applying extra ACPI _GTF filter 0x%x for %s\n",
                 filter, dmi->ident);

        for (i = 0; i < host->n_ports; i++) {
                struct ata_port *ap = host->ports[i];
                struct ata_link *link;
                struct ata_device *dev;

                ata_for_each_link(link, ap, EDGE)
                        ata_for_each_dev(dev, link, ALL)
                                dev->gtf_filter |= filter;
        }
}
#else
static inline void ahci_gtf_filter_workaround(struct ata_host *host)
{}
#endif

#ifdef CONFIG_ARM64
/*
 * Due to ERRATA#22536, ThunderX needs to handle HOST_IRQ_STAT differently.
 * Workaround is to make sure all pending IRQs are served before leaving
 * handler.
 */
static irqreturn_t ahci_thunderx_irq_handler(int irq, void *dev_instance)
{
        struct ata_host *host = dev_instance;
        struct ahci_host_priv *hpriv;
        unsigned int rc = 0;
        void __iomem *mmio;
        u32 irq_stat, irq_masked;
        unsigned int handled = 1;

        VPRINTK("ENTER\n");
        hpriv = host->private_data;
        mmio = hpriv->mmio;
        irq_stat = readl(mmio + HOST_IRQ_STAT);
        if (!irq_stat)
                return IRQ_NONE;

        do {
                irq_masked = irq_stat & hpriv->port_map;
                spin_lock(&host->lock);
                rc = ahci_handle_port_intr(host, irq_masked);
                if (!rc)
                        handled = 0;
                writel(irq_stat, mmio + HOST_IRQ_STAT);
                irq_stat = readl(mmio + HOST_IRQ_STAT);
                spin_unlock(&host->lock);
        } while (irq_stat);
        VPRINTK("EXIT\n");

        return IRQ_RETVAL(handled);
}
#endif

/*
 * ahci_init_msix() - optionally enable per-port MSI-X otherwise defer
 * to single msi.
 */
static int ahci_init_msix(struct pci_dev *pdev, unsigned int n_ports,
                          struct ahci_host_priv *hpriv, unsigned long flags)
{
        int nvec, i, rc;

        /* Do not init MSI-X if MSI is disabled for the device */
        if (hpriv->flags & AHCI_HFLAG_NO_MSI)
                return -ENODEV;

        nvec = pci_msix_vec_count(pdev);
        if (nvec < 0)
                return nvec;

        /*
         * Proper MSI-X implementations will have a vector per-port.
         * Barring that, we prefer single-MSI over single-MSIX.  If this
         * check fails (not enough MSI-X vectors for all ports) we will
         * be called again with the flag clear iff ahci_init_msi()
         * fails.
         */
        if (flags & AHCI_HFLAG_MULTI_MSIX) {
                if (nvec < n_ports)
                        return -ENODEV;
                nvec = n_ports;
        } else if (nvec) {
                nvec = 1;
        } else {
                /*
                 * Emit dev_err() since this was the non-legacy irq
                 * method of last resort.
                 */
                rc = -ENODEV;
                goto fail;
        }

        for (i = 0; i < nvec; i++)
                hpriv->msix[i].entry = i;
        rc = pci_enable_msix_exact(pdev, hpriv->msix, nvec);
        if (rc < 0)
                goto fail;

        if (nvec > 1)
                hpriv->flags |= AHCI_HFLAG_MULTI_MSIX;
        hpriv->irq = hpriv->msix[0].vector; /* for single msi-x */

        return nvec;
fail:
        dev_err(&pdev->dev,
                "failed to enable MSI-X with error %d, # of vectors: %d\n",
                rc, nvec);

        return rc;
}

static int ahci_init_msi(struct pci_dev *pdev, unsigned int n_ports,
                        struct ahci_host_priv *hpriv)
{
        int rc, nvec;

        if (hpriv->flags & AHCI_HFLAG_NO_MSI)
                return -ENODEV;

        nvec = pci_msi_vec_count(pdev);
        if (nvec < 0)
                return nvec;

        /*
         * If number of MSIs is less than number of ports then Sharing Last
         * Message mode could be enforced. In this case assume that advantage
         * of multipe MSIs is negated and use single MSI mode instead.
         */
        if (nvec < n_ports)
                goto single_msi;

        rc = pci_enable_msi_exact(pdev, nvec);
        if (rc == -ENOSPC)
                goto single_msi;
        if (rc < 0)
                return rc;

        /* fallback to single MSI mode if the controller enforced MRSM mode */
        if (readl(hpriv->mmio + HOST_CTL) & HOST_MRSM) {
                pci_disable_msi(pdev);
                printk(KERN_INFO "ahci: MRSM is on, fallback to single MSI\n");
                goto single_msi;
        }

        if (nvec > 1)
                hpriv->flags |= AHCI_HFLAG_MULTI_MSI;

        goto out;

single_msi:
        nvec = 1;

        rc = pci_enable_msi(pdev);
        if (rc < 0)
                return rc;
out:
        hpriv->irq = pdev->irq;

        return nvec;
}

static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
                                struct ahci_host_priv *hpriv)
{
        int nvec;

        /*
         * Try to enable per-port MSI-X.  If the host is not capable
         * fall back to single MSI before finally attempting single
         * MSI-X.
         */
        nvec = ahci_init_msix(pdev, n_ports, hpriv, AHCI_HFLAG_MULTI_MSIX);
        if (nvec >= 0)
                return nvec;

        nvec = ahci_init_msi(pdev, n_ports, hpriv);
        if (nvec >= 0)
                return nvec;

        /* try single-msix */
        nvec = ahci_init_msix(pdev, n_ports, hpriv, 0);
        if (nvec >= 0)
                return nvec;

        /* legacy intx interrupts */
        pci_intx(pdev, 1);
        hpriv->irq = pdev->irq;

        return 0;
}

static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        unsigned int board_id = ent->driver_data;
        struct ata_port_info pi = ahci_port_info[board_id];
        const struct ata_port_info *ppi[] = { &pi, NULL };
        struct device *dev = &pdev->dev;
        struct ahci_host_priv *hpriv;
        struct ata_host *host;
        int n_ports, i, rc;
        int ahci_pci_bar = AHCI_PCI_BAR_STANDARD;

        VPRINTK("ENTER\n");

        WARN_ON((int)ATA_MAX_QUEUE > AHCI_MAX_CMDS);

        ata_print_version_once(&pdev->dev, DRV_VERSION);

        /* The AHCI driver can only drive the SATA ports, the PATA driver
           can drive them all so if both drivers are selected make sure
           AHCI stays out of the way */
        if (pdev->vendor == PCI_VENDOR_ID_MARVELL && !marvell_enable)
                return -ENODEV;

        /* Apple BIOS on MCP89 prevents us using AHCI */
        if (is_mcp89_apple(pdev))
                ahci_mcp89_apple_enable(pdev);

        /* Promise's PDC42819 is a SAS/SATA controller that has an AHCI mode.
         * At the moment, we can only use the AHCI mode. Let the users know
         * that for SAS drives they're out of luck.
         */
        if (pdev->vendor == PCI_VENDOR_ID_PROMISE)
                dev_info(&pdev->dev,
                         "PDC42819 can only drive SATA devices with this driver\n");

        /* Some devices use non-standard BARs */
        if (pdev->vendor == PCI_VENDOR_ID_STMICRO && pdev->device == 0xCC06)
                ahci_pci_bar = AHCI_PCI_BAR_STA2X11;
        else if (pdev->vendor == 0x1c44 && pdev->device == 0x8000)
                ahci_pci_bar = AHCI_PCI_BAR_ENMOTUS;
        else if (pdev->vendor == 0x177d && pdev->device == 0xa01c)
                ahci_pci_bar = AHCI_PCI_BAR_CAVIUM;

        /* acquire resources */
        rc = pcim_enable_device(pdev);
        if (rc)
                return rc;

        if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
            (pdev->device == 0x2652 || pdev->device == 0x2653)) {
                u8 map;

                /* ICH6s share the same PCI ID for both piix and ahci
                 * modes.  Enabling ahci mode while MAP indicates
                 * combined mode is a bad idea.  Yield to ata_piix.
                 */
                pci_read_config_byte(pdev, ICH_MAP, &map);
                if (map & 0x3) {
                        dev_info(&pdev->dev,
                                 "controller is in combined mode, can't enable AHCI mode\n");
                        return -ENODEV;
                }
        }

        /* AHCI controllers often implement SFF compatible interface.
         * Grab all PCI BARs just in case.
         */
        rc = pcim_iomap_regions_request_all(pdev, 1 << ahci_pci_bar, DRV_NAME);
        if (rc == -EBUSY)
                pcim_pin_device(pdev);
        if (rc)
                return rc;

        hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
        if (!hpriv)
                return -ENOMEM;
        hpriv->flags |= (unsigned long)pi.private_data;

        /* MCP65 revision A1 and A2 can't do MSI */
        if (board_id == board_ahci_mcp65 &&
            (pdev->revision == 0xa1 || pdev->revision == 0xa2))
                hpriv->flags |= AHCI_HFLAG_NO_MSI;

        /* SB800 does NOT need the workaround to ignore SERR_INTERNAL */
        if (board_id == board_ahci_sb700 && pdev->revision >= 0x40)
                hpriv->flags &= ~AHCI_HFLAG_IGN_SERR_INTERNAL;

        /* only some SB600s can do 64bit DMA */
        if (ahci_sb600_enable_64bit(pdev))
                hpriv->flags &= ~AHCI_HFLAG_32BIT_ONLY;

        hpriv->mmio = pcim_iomap_table(pdev)[ahci_pci_bar];

        /* must set flag prior to save config in order to take effect */
        if (ahci_broken_devslp(pdev))
                hpriv->flags |= AHCI_HFLAG_NO_DEVSLP;

#ifdef CONFIG_ARM64
        if (pdev->vendor == 0x177d && pdev->device == 0xa01c)
                hpriv->irq_handler = ahci_thunderx_irq_handler;
#endif

        /* save initial config */
        ahci_pci_save_initial_config(pdev, hpriv);

        /* prepare host */
        if (hpriv->cap & HOST_CAP_NCQ) {
                pi.flags |= ATA_FLAG_NCQ;
                /*
                 * Auto-activate optimization is supposed to be
                 * supported on all AHCI controllers indicating NCQ
                 * capability, but it seems to be broken on some
                 * chipsets including NVIDIAs.
                 */
                if (!(hpriv->flags & AHCI_HFLAG_NO_FPDMA_AA))
                        pi.flags |= ATA_FLAG_FPDMA_AA;

                /*
                 * All AHCI controllers should be forward-compatible
                 * with the new auxiliary field. This code should be
                 * conditionalized if any buggy AHCI controllers are
                 * encountered.
                 */
                pi.flags |= ATA_FLAG_FPDMA_AUX;
        }

        if (hpriv->cap & HOST_CAP_PMP)
                pi.flags |= ATA_FLAG_PMP;

        ahci_set_em_messages(hpriv, &pi);

        if (ahci_broken_system_poweroff(pdev)) {
                pi.flags |= ATA_FLAG_NO_POWEROFF_SPINDOWN;
                dev_info(&pdev->dev,
                        "quirky BIOS, skipping spindown on poweroff\n");
        }

        if (ahci_broken_suspend(pdev)) {
                hpriv->flags |= AHCI_HFLAG_NO_SUSPEND;
                dev_warn(&pdev->dev,
                         "BIOS update required for suspend/resume\n");
        }

        if (ahci_broken_online(pdev)) {
                hpriv->flags |= AHCI_HFLAG_SRST_TOUT_IS_OFFLINE;
                dev_info(&pdev->dev,
                         "online status unreliable, applying workaround\n");
        }

        /* CAP.NP sometimes indicate the index of the last enabled
         * port, at other times, that of the last possible port, so
         * determining the maximum port number requires looking at
         * both CAP.NP and port_map.
         */
        n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));

        host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
        if (!host)
                return -ENOMEM;
        host->private_data = hpriv;
        hpriv->msix = devm_kzalloc(&pdev->dev,
                        sizeof(struct msix_entry) * n_ports, GFP_KERNEL);
        if (!hpriv->msix)
                return -ENOMEM;
        ahci_init_interrupts(pdev, n_ports, hpriv);

        if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
                host->flags |= ATA_HOST_PARALLEL_SCAN;
        else
                dev_info(&pdev->dev, "SSS flag set, parallel bus scan disabled\n");

        if (pi.flags & ATA_FLAG_EM)
                ahci_reset_em(host);

        for (i = 0; i < host->n_ports; i++) {
                struct ata_port *ap = host->ports[i];

                ata_port_pbar_desc(ap, ahci_pci_bar, -1, "abar");
                ata_port_pbar_desc(ap, ahci_pci_bar,
                                   0x100 + ap->port_no * 0x80, "port");

                /* set enclosure management message type */
                if (ap->flags & ATA_FLAG_EM)
                        ap->em_message_type = hpriv->em_msg_type;


                /* disabled/not-implemented port */
                if (!(hpriv->port_map & (1 << i)))
                        ap->ops = &ata_dummy_port_ops;
        }

        /* apply workaround for ASUS P5W DH Deluxe mainboard */
        ahci_p5wdh_workaround(host);

        /* apply gtf filter quirk */
        ahci_gtf_filter_workaround(host);

        /* initialize adapter */
        rc = ahci_configure_dma_masks(pdev, hpriv->cap & HOST_CAP_64);
        if (rc)
                return rc;

        rc = ahci_pci_reset_controller(host);
        if (rc)
                return rc;

        ahci_pci_init_controller(host);
        ahci_pci_print_info(host);

        pci_set_master(pdev);

        rc = ahci_host_activate(host, &ahci_sht);
        if (rc)
                return rc;

        pm_runtime_put_noidle(&pdev->dev);
        return 0;
}

static void ahci_remove_one(struct pci_dev *pdev)
{
        pm_runtime_get_noresume(&pdev->dev);
        ata_pci_remove_one(pdev);
}

module_pci_driver(ahci_pci_driver);

MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("AHCI SATA low-level driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ahci_pci_tbl);
MODULE_VERSION(DRV_VERSION);