sata_mv: remove leftovers

[safe/jmp/linux-2.6] / drivers / ata / sata_mv.c

/*
 * sata_mv.c - Marvell SATA support
 *
 * Copyright 2008: Marvell Corporation, all rights reserved.
 * Copyright 2005: EMC Corporation, all rights reserved.
 * Copyright 2005 Red Hat, Inc.  All rights reserved.
 *
 * Please ALWAYS copy linux-ide@vger.kernel.org on emails.
 *
 * 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; version 2 of the License.
 *
 * 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; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/*
 * sata_mv TODO list:
 *
 * --> Errata workaround for NCQ device errors.
 *
 * --> More errata workarounds for PCI-X.
 *
 * --> Complete a full errata audit for all chipsets to identify others.
 *
 * --> Develop a low-power-consumption strategy, and implement it.
 *
 * --> [Experiment, low priority] Investigate interrupt coalescing.
 *       Quite often, especially with PCI Message Signalled Interrupts (MSI),
 *       the overhead reduced by interrupt mitigation is quite often not
 *       worth the latency cost.
 *
 * --> [Experiment, Marvell value added] Is it possible to use target
 *       mode to cross-connect two Linux boxes with Marvell cards?  If so,
 *       creating LibATA target mode support would be very interesting.
 *
 *       Target mode, for those without docs, is the ability to directly
 *       connect two SATA ports.
 */

#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/dmapool.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/ata_platform.h>
#include <linux/mbus.h>
#include <linux/bitops.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <linux/libata.h>

#define DRV_NAME        "sata_mv"
#define DRV_VERSION     "1.26"

enum {
        /* BAR's are enumerated in terms of pci_resource_start() terms */
        MV_PRIMARY_BAR          = 0,    /* offset 0x10: memory space */
        MV_IO_BAR               = 2,    /* offset 0x18: IO space */
        MV_MISC_BAR             = 3,    /* offset 0x1c: FLASH, NVRAM, SRAM */

        MV_MAJOR_REG_AREA_SZ    = 0x10000,      /* 64KB */
        MV_MINOR_REG_AREA_SZ    = 0x2000,       /* 8KB */

        MV_PCI_REG_BASE         = 0,
        MV_IRQ_COAL_REG_BASE    = 0x18000,      /* 6xxx part only */
        MV_IRQ_COAL_CAUSE               = (MV_IRQ_COAL_REG_BASE + 0x08),
        MV_IRQ_COAL_CAUSE_LO            = (MV_IRQ_COAL_REG_BASE + 0x88),
        MV_IRQ_COAL_CAUSE_HI            = (MV_IRQ_COAL_REG_BASE + 0x8c),
        MV_IRQ_COAL_THRESHOLD           = (MV_IRQ_COAL_REG_BASE + 0xcc),
        MV_IRQ_COAL_TIME_THRESHOLD      = (MV_IRQ_COAL_REG_BASE + 0xd0),

        MV_SATAHC0_REG_BASE     = 0x20000,
        MV_FLASH_CTL_OFS        = 0x1046c,
        MV_GPIO_PORT_CTL_OFS    = 0x104f0,
        MV_RESET_CFG_OFS        = 0x180d8,

        MV_PCI_REG_SZ           = MV_MAJOR_REG_AREA_SZ,
        MV_SATAHC_REG_SZ        = MV_MAJOR_REG_AREA_SZ,
        MV_SATAHC_ARBTR_REG_SZ  = MV_MINOR_REG_AREA_SZ,         /* arbiter */
        MV_PORT_REG_SZ          = MV_MINOR_REG_AREA_SZ,

        MV_MAX_Q_DEPTH          = 32,
        MV_MAX_Q_DEPTH_MASK     = MV_MAX_Q_DEPTH - 1,

        /* CRQB needs alignment on a 1KB boundary. Size == 1KB
         * CRPB needs alignment on a 256B boundary. Size == 256B
         * ePRD (SG) entries need alignment on a 16B boundary. Size == 16B
         */
        MV_CRQB_Q_SZ            = (32 * MV_MAX_Q_DEPTH),
        MV_CRPB_Q_SZ            = (8 * MV_MAX_Q_DEPTH),
        MV_MAX_SG_CT            = 256,
        MV_SG_TBL_SZ            = (16 * MV_MAX_SG_CT),

        /* Determine hc from 0-7 port: hc = port >> MV_PORT_HC_SHIFT */
        MV_PORT_HC_SHIFT        = 2,
        MV_PORTS_PER_HC         = (1 << MV_PORT_HC_SHIFT), /* 4 */
        /* Determine hc port from 0-7 port: hardport = port & MV_PORT_MASK */
        MV_PORT_MASK            = (MV_PORTS_PER_HC - 1),   /* 3 */

        /* Host Flags */
        MV_FLAG_DUAL_HC         = (1 << 30),  /* two SATA Host Controllers */
        MV_FLAG_IRQ_COALESCE    = (1 << 29),  /* IRQ coalescing capability */

        MV_COMMON_FLAGS         = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
                                  ATA_FLAG_MMIO | ATA_FLAG_PIO_POLLING,

        MV_GEN_I_FLAGS          = MV_COMMON_FLAGS | ATA_FLAG_NO_ATAPI,

        MV_GEN_II_FLAGS         = MV_COMMON_FLAGS | MV_FLAG_IRQ_COALESCE |
                                  ATA_FLAG_PMP | ATA_FLAG_ACPI_SATA |
                                  ATA_FLAG_NCQ,

        MV_GEN_IIE_FLAGS        = MV_GEN_II_FLAGS | ATA_FLAG_AN,

        CRQB_FLAG_READ          = (1 << 0),
        CRQB_TAG_SHIFT          = 1,
        CRQB_IOID_SHIFT         = 6,    /* CRQB Gen-II/IIE IO Id shift */
        CRQB_PMP_SHIFT          = 12,   /* CRQB Gen-II/IIE PMP shift */
        CRQB_HOSTQ_SHIFT        = 17,   /* CRQB Gen-II/IIE HostQueTag shift */
        CRQB_CMD_ADDR_SHIFT     = 8,
        CRQB_CMD_CS             = (0x2 << 11),
        CRQB_CMD_LAST           = (1 << 15),

        CRPB_FLAG_STATUS_SHIFT  = 8,
        CRPB_IOID_SHIFT_6       = 5,    /* CRPB Gen-II IO Id shift */
        CRPB_IOID_SHIFT_7       = 7,    /* CRPB Gen-IIE IO Id shift */

        EPRD_FLAG_END_OF_TBL    = (1 << 31),

        /* PCI interface registers */

        PCI_COMMAND_OFS         = 0xc00,
        PCI_COMMAND_MRDTRIG     = (1 << 7),     /* PCI Master Read Trigger */

        PCI_MAIN_CMD_STS_OFS    = 0xd30,
        STOP_PCI_MASTER         = (1 << 2),
        PCI_MASTER_EMPTY        = (1 << 3),
        GLOB_SFT_RST            = (1 << 4),

        MV_PCI_MODE_OFS         = 0xd00,
        MV_PCI_MODE_MASK        = 0x30,

        MV_PCI_EXP_ROM_BAR_CTL  = 0xd2c,
        MV_PCI_DISC_TIMER       = 0xd04,
        MV_PCI_MSI_TRIGGER      = 0xc38,
        MV_PCI_SERR_MASK        = 0xc28,
        MV_PCI_XBAR_TMOUT_OFS   = 0x1d04,
        MV_PCI_ERR_LOW_ADDRESS  = 0x1d40,
        MV_PCI_ERR_HIGH_ADDRESS = 0x1d44,
        MV_PCI_ERR_ATTRIBUTE    = 0x1d48,
        MV_PCI_ERR_COMMAND      = 0x1d50,

        PCI_IRQ_CAUSE_OFS       = 0x1d58,
        PCI_IRQ_MASK_OFS        = 0x1d5c,
        PCI_UNMASK_ALL_IRQS     = 0x7fffff,     /* bits 22-0 */

        PCIE_IRQ_CAUSE_OFS      = 0x1900,
        PCIE_IRQ_MASK_OFS       = 0x1910,
        PCIE_UNMASK_ALL_IRQS    = 0x40a,        /* assorted bits */

        /* Host Controller Main Interrupt Cause/Mask registers (1 per-chip) */
        PCI_HC_MAIN_IRQ_CAUSE_OFS = 0x1d60,
        PCI_HC_MAIN_IRQ_MASK_OFS  = 0x1d64,
        SOC_HC_MAIN_IRQ_CAUSE_OFS = 0x20020,
        SOC_HC_MAIN_IRQ_MASK_OFS  = 0x20024,
        ERR_IRQ                 = (1 << 0),     /* shift by port # */
        DONE_IRQ                = (1 << 1),     /* shift by port # */
        HC0_IRQ_PEND            = 0x1ff,        /* bits 0-8 = HC0's ports */
        HC_SHIFT                = 9,            /* bits 9-17 = HC1's ports */
        PCI_ERR                 = (1 << 18),
        TRAN_LO_DONE            = (1 << 19),    /* 6xxx: IRQ coalescing */
        TRAN_HI_DONE            = (1 << 20),    /* 6xxx: IRQ coalescing */
        PORTS_0_3_COAL_DONE     = (1 << 8),
        PORTS_4_7_COAL_DONE     = (1 << 17),
        PORTS_0_7_COAL_DONE     = (1 << 21),    /* 6xxx: IRQ coalescing */
        GPIO_INT                = (1 << 22),
        SELF_INT                = (1 << 23),
        TWSI_INT                = (1 << 24),
        HC_MAIN_RSVD            = (0x7f << 25), /* bits 31-25 */
        HC_MAIN_RSVD_5          = (0x1fff << 19), /* bits 31-19 */
        HC_MAIN_RSVD_SOC        = (0x3fffffb << 6),     /* bits 31-9, 7-6 */

        /* SATAHC registers */
        HC_CFG_OFS              = 0,

        HC_IRQ_CAUSE_OFS        = 0x14,
        DMA_IRQ                 = (1 << 0),     /* shift by port # */
        HC_COAL_IRQ             = (1 << 4),     /* IRQ coalescing */
        DEV_IRQ                 = (1 << 8),     /* shift by port # */

        /* Shadow block registers */
        SHD_BLK_OFS             = 0x100,
        SHD_CTL_AST_OFS         = 0x20,         /* ofs from SHD_BLK_OFS */

        /* SATA registers */
        SATA_STATUS_OFS         = 0x300,  /* ctrl, err regs follow status */
        SATA_ACTIVE_OFS         = 0x350,
        SATA_FIS_IRQ_CAUSE_OFS  = 0x364,
        SATA_FIS_IRQ_AN         = (1 << 9),     /* async notification */

        LTMODE_OFS              = 0x30c,
        LTMODE_BIT8             = (1 << 8),     /* unknown, but necessary */

        PHY_MODE3               = 0x310,
        PHY_MODE4               = 0x314,
        PHY_MODE4_CFG_MASK      = 0x00000003,   /* phy internal config field */
        PHY_MODE4_CFG_VALUE     = 0x00000001,   /* phy internal config field */
        PHY_MODE4_RSVD_ZEROS    = 0x5de3fffa,   /* Gen2e always write zeros */
        PHY_MODE4_RSVD_ONES     = 0x00000005,   /* Gen2e always write ones */

        PHY_MODE2               = 0x330,
        SATA_IFCTL_OFS          = 0x344,
        SATA_TESTCTL_OFS        = 0x348,
        SATA_IFSTAT_OFS         = 0x34c,
        VENDOR_UNIQUE_FIS_OFS   = 0x35c,

        FISCFG_OFS              = 0x360,
        FISCFG_WAIT_DEV_ERR     = (1 << 8),     /* wait for host on DevErr */
        FISCFG_SINGLE_SYNC      = (1 << 16),    /* SYNC on DMA activation */

        MV5_PHY_MODE            = 0x74,
        MV5_LTMODE_OFS          = 0x30,
        MV5_PHY_CTL_OFS         = 0x0C,
        SATA_INTERFACE_CFG_OFS  = 0x050,

        MV_M2_PREAMP_MASK       = 0x7e0,

        /* Port registers */
        EDMA_CFG_OFS            = 0,
        EDMA_CFG_Q_DEPTH        = 0x1f,         /* max device queue depth */
        EDMA_CFG_NCQ            = (1 << 5),     /* for R/W FPDMA queued */
        EDMA_CFG_NCQ_GO_ON_ERR  = (1 << 14),    /* continue on error */
        EDMA_CFG_RD_BRST_EXT    = (1 << 11),    /* read burst 512B */
        EDMA_CFG_WR_BUFF_LEN    = (1 << 13),    /* write buffer 512B */
        EDMA_CFG_EDMA_FBS       = (1 << 16),    /* EDMA FIS-Based Switching */
        EDMA_CFG_FBS            = (1 << 26),    /* FIS-Based Switching */

        EDMA_ERR_IRQ_CAUSE_OFS  = 0x8,
        EDMA_ERR_IRQ_MASK_OFS   = 0xc,
        EDMA_ERR_D_PAR          = (1 << 0),     /* UDMA data parity err */
        EDMA_ERR_PRD_PAR        = (1 << 1),     /* UDMA PRD parity err */
        EDMA_ERR_DEV            = (1 << 2),     /* device error */
        EDMA_ERR_DEV_DCON       = (1 << 3),     /* device disconnect */
        EDMA_ERR_DEV_CON        = (1 << 4),     /* device connected */
        EDMA_ERR_SERR           = (1 << 5),     /* SError bits [WBDST] raised */
        EDMA_ERR_SELF_DIS       = (1 << 7),     /* Gen II/IIE self-disable */
        EDMA_ERR_SELF_DIS_5     = (1 << 8),     /* Gen I self-disable */
        EDMA_ERR_BIST_ASYNC     = (1 << 8),     /* BIST FIS or Async Notify */
        EDMA_ERR_TRANS_IRQ_7    = (1 << 8),     /* Gen IIE transprt layer irq */
        EDMA_ERR_CRQB_PAR       = (1 << 9),     /* CRQB parity error */
        EDMA_ERR_CRPB_PAR       = (1 << 10),    /* CRPB parity error */
        EDMA_ERR_INTRL_PAR      = (1 << 11),    /* internal parity error */
        EDMA_ERR_IORDY          = (1 << 12),    /* IORdy timeout */

        EDMA_ERR_LNK_CTRL_RX    = (0xf << 13),  /* link ctrl rx error */
        EDMA_ERR_LNK_CTRL_RX_0  = (1 << 13),    /* transient: CRC err */
        EDMA_ERR_LNK_CTRL_RX_1  = (1 << 14),    /* transient: FIFO err */
        EDMA_ERR_LNK_CTRL_RX_2  = (1 << 15),    /* fatal: caught SYNC */
        EDMA_ERR_LNK_CTRL_RX_3  = (1 << 16),    /* transient: FIS rx err */

        EDMA_ERR_LNK_DATA_RX    = (0xf << 17),  /* link data rx error */

        EDMA_ERR_LNK_CTRL_TX    = (0x1f << 21), /* link ctrl tx error */
        EDMA_ERR_LNK_CTRL_TX_0  = (1 << 21),    /* transient: CRC err */
        EDMA_ERR_LNK_CTRL_TX_1  = (1 << 22),    /* transient: FIFO err */
        EDMA_ERR_LNK_CTRL_TX_2  = (1 << 23),    /* transient: caught SYNC */
        EDMA_ERR_LNK_CTRL_TX_3  = (1 << 24),    /* transient: caught DMAT */
        EDMA_ERR_LNK_CTRL_TX_4  = (1 << 25),    /* transient: FIS collision */

        EDMA_ERR_LNK_DATA_TX    = (0x1f << 26), /* link data tx error */

        EDMA_ERR_TRANS_PROTO    = (1 << 31),    /* transport protocol error */
        EDMA_ERR_OVERRUN_5      = (1 << 5),
        EDMA_ERR_UNDERRUN_5     = (1 << 6),

        EDMA_ERR_IRQ_TRANSIENT  = EDMA_ERR_LNK_CTRL_RX_0 |
                                  EDMA_ERR_LNK_CTRL_RX_1 |
                                  EDMA_ERR_LNK_CTRL_RX_3 |
                                  EDMA_ERR_LNK_CTRL_TX,

        EDMA_EH_FREEZE          = EDMA_ERR_D_PAR |
                                  EDMA_ERR_PRD_PAR |
                                  EDMA_ERR_DEV_DCON |
                                  EDMA_ERR_DEV_CON |
                                  EDMA_ERR_SERR |
                                  EDMA_ERR_SELF_DIS |
                                  EDMA_ERR_CRQB_PAR |
                                  EDMA_ERR_CRPB_PAR |
                                  EDMA_ERR_INTRL_PAR |
                                  EDMA_ERR_IORDY |
                                  EDMA_ERR_LNK_CTRL_RX_2 |
                                  EDMA_ERR_LNK_DATA_RX |
                                  EDMA_ERR_LNK_DATA_TX |
                                  EDMA_ERR_TRANS_PROTO,

        EDMA_EH_FREEZE_5        = EDMA_ERR_D_PAR |
                                  EDMA_ERR_PRD_PAR |
                                  EDMA_ERR_DEV_DCON |
                                  EDMA_ERR_DEV_CON |
                                  EDMA_ERR_OVERRUN_5 |
                                  EDMA_ERR_UNDERRUN_5 |
                                  EDMA_ERR_SELF_DIS_5 |
                                  EDMA_ERR_CRQB_PAR |
                                  EDMA_ERR_CRPB_PAR |
                                  EDMA_ERR_INTRL_PAR |
                                  EDMA_ERR_IORDY,

        EDMA_REQ_Q_BASE_HI_OFS  = 0x10,
        EDMA_REQ_Q_IN_PTR_OFS   = 0x14,         /* also contains BASE_LO */

        EDMA_REQ_Q_OUT_PTR_OFS  = 0x18,
        EDMA_REQ_Q_PTR_SHIFT    = 5,

        EDMA_RSP_Q_BASE_HI_OFS  = 0x1c,
        EDMA_RSP_Q_IN_PTR_OFS   = 0x20,
        EDMA_RSP_Q_OUT_PTR_OFS  = 0x24,         /* also contains BASE_LO */
        EDMA_RSP_Q_PTR_SHIFT    = 3,

        EDMA_CMD_OFS            = 0x28,         /* EDMA command register */
        EDMA_EN                 = (1 << 0),     /* enable EDMA */
        EDMA_DS                 = (1 << 1),     /* disable EDMA; self-negated */
        EDMA_RESET              = (1 << 2),     /* reset eng/trans/link/phy */

        EDMA_STATUS_OFS         = 0x30,         /* EDMA engine status */
        EDMA_STATUS_CACHE_EMPTY = (1 << 6),     /* GenIIe command cache empty */
        EDMA_STATUS_IDLE        = (1 << 7),     /* GenIIe EDMA enabled/idle */

        EDMA_IORDY_TMOUT_OFS    = 0x34,
        EDMA_ARB_CFG_OFS        = 0x38,

        EDMA_HALTCOND_OFS       = 0x60,         /* GenIIe halt conditions */


        BMDMA_CMD_OFS           = 0x224,        /* bmdma command register */
        BMDMA_STATUS_OFS        = 0x228,        /* bmdma status register */
        BMDMA_PRD_LOW_OFS       = 0x22c,        /* bmdma PRD addr 31:0 */
        BMDMA_PRD_HIGH_OFS      = 0x230,        /* bmdma PRD addr 63:32 */

        /* Host private flags (hp_flags) */
        MV_HP_FLAG_MSI          = (1 << 0),
        MV_HP_ERRATA_50XXB0     = (1 << 1),
        MV_HP_ERRATA_50XXB2     = (1 << 2),
        MV_HP_ERRATA_60X1B2     = (1 << 3),
        MV_HP_ERRATA_60X1C0     = (1 << 4),
        MV_HP_GEN_I             = (1 << 6),     /* Generation I: 50xx */
        MV_HP_GEN_II            = (1 << 7),     /* Generation II: 60xx */
        MV_HP_GEN_IIE           = (1 << 8),     /* Generation IIE: 6042/7042 */
        MV_HP_PCIE              = (1 << 9),     /* PCIe bus/regs: 7042 */
        MV_HP_CUT_THROUGH       = (1 << 10),    /* can use EDMA cut-through */
        MV_HP_FLAG_SOC          = (1 << 11),    /* SystemOnChip, no PCI */

        /* Port private flags (pp_flags) */
        MV_PP_FLAG_EDMA_EN      = (1 << 0),     /* is EDMA engine enabled? */
        MV_PP_FLAG_NCQ_EN       = (1 << 1),     /* is EDMA set up for NCQ? */
        MV_PP_FLAG_FBS_EN       = (1 << 2),     /* is EDMA set up for FBS? */
        MV_PP_FLAG_DELAYED_EH   = (1 << 3),     /* delayed dev err handling */
};

#define IS_GEN_I(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_I)
#define IS_GEN_II(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_II)
#define IS_GEN_IIE(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_IIE)
#define IS_PCIE(hpriv) ((hpriv)->hp_flags & MV_HP_PCIE)
#define IS_SOC(hpriv) ((hpriv)->hp_flags & MV_HP_FLAG_SOC)

#define WINDOW_CTRL(i)          (0x20030 + ((i) << 4))
#define WINDOW_BASE(i)          (0x20034 + ((i) << 4))

enum {
        /* DMA boundary 0xffff is required by the s/g splitting
         * we need on /length/ in mv_fill-sg().
         */
        MV_DMA_BOUNDARY         = 0xffffU,

        /* mask of register bits containing lower 32 bits
         * of EDMA request queue DMA address
         */
        EDMA_REQ_Q_BASE_LO_MASK = 0xfffffc00U,

        /* ditto, for response queue */
        EDMA_RSP_Q_BASE_LO_MASK = 0xffffff00U,
};

enum chip_type {
        chip_504x,
        chip_508x,
        chip_5080,
        chip_604x,
        chip_608x,
        chip_6042,
        chip_7042,
        chip_soc,
};

/* Command ReQuest Block: 32B */
struct mv_crqb {
        __le32                  sg_addr;
        __le32                  sg_addr_hi;
        __le16                  ctrl_flags;
        __le16                  ata_cmd[11];
};

struct mv_crqb_iie {
        __le32                  addr;
        __le32                  addr_hi;
        __le32                  flags;
        __le32                  len;
        __le32                  ata_cmd[4];
};

/* Command ResPonse Block: 8B */
struct mv_crpb {
        __le16                  id;
        __le16                  flags;
        __le32                  tmstmp;
};

/* EDMA Physical Region Descriptor (ePRD); A.K.A. SG */
struct mv_sg {
        __le32                  addr;
        __le32                  flags_size;
        __le32                  addr_hi;
        __le32                  reserved;
};

struct mv_port_priv {
        struct mv_crqb          *crqb;
        dma_addr_t              crqb_dma;
        struct mv_crpb          *crpb;
        dma_addr_t              crpb_dma;
        struct mv_sg            *sg_tbl[MV_MAX_Q_DEPTH];
        dma_addr_t              sg_tbl_dma[MV_MAX_Q_DEPTH];

        unsigned int            req_idx;
        unsigned int            resp_idx;

        u32                     pp_flags;
        unsigned int            delayed_eh_pmp_map;
};

struct mv_port_signal {
        u32                     amps;
        u32                     pre;
};

struct mv_host_priv {
        u32                     hp_flags;
        u32                     main_irq_mask;
        struct mv_port_signal   signal[8];
        const struct mv_hw_ops  *ops;
        int                     n_ports;
        void __iomem            *base;
        void __iomem            *main_irq_cause_addr;
        void __iomem            *main_irq_mask_addr;
        u32                     irq_cause_ofs;
        u32                     irq_mask_ofs;
        u32                     unmask_all_irqs;
        /*
         * These consistent DMA memory pools give us guaranteed
         * alignment for hardware-accessed data structures,
         * and less memory waste in accomplishing the alignment.
         */
        struct dma_pool         *crqb_pool;
        struct dma_pool         *crpb_pool;
        struct dma_pool         *sg_tbl_pool;
};

struct mv_hw_ops {
        void (*phy_errata)(struct mv_host_priv *hpriv, void __iomem *mmio,
                           unsigned int port);
        void (*enable_leds)(struct mv_host_priv *hpriv, void __iomem *mmio);
        void (*read_preamp)(struct mv_host_priv *hpriv, int idx,
                           void __iomem *mmio);
        int (*reset_hc)(struct mv_host_priv *hpriv, void __iomem *mmio,
                        unsigned int n_hc);
        void (*reset_flash)(struct mv_host_priv *hpriv, void __iomem *mmio);
        void (*reset_bus)(struct ata_host *host, void __iomem *mmio);
};

static int mv_scr_read(struct ata_link *link, unsigned int sc_reg_in, u32 *val);
static int mv_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val);
static int mv5_scr_read(struct ata_link *link, unsigned int sc_reg_in, u32 *val);
static int mv5_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val);
static int mv_port_start(struct ata_port *ap);
static void mv_port_stop(struct ata_port *ap);
static int mv_qc_defer(struct ata_queued_cmd *qc);
static void mv_qc_prep(struct ata_queued_cmd *qc);
static void mv_qc_prep_iie(struct ata_queued_cmd *qc);
static unsigned int mv_qc_issue(struct ata_queued_cmd *qc);
static int mv_hardreset(struct ata_link *link, unsigned int *class,
                        unsigned long deadline);
static void mv_eh_freeze(struct ata_port *ap);
static void mv_eh_thaw(struct ata_port *ap);
static void mv6_dev_config(struct ata_device *dev);

static void mv5_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
                           unsigned int port);
static void mv5_enable_leds(struct mv_host_priv *hpriv, void __iomem *mmio);
static void mv5_read_preamp(struct mv_host_priv *hpriv, int idx,
                           void __iomem *mmio);
static int mv5_reset_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
                        unsigned int n_hc);
static void mv5_reset_flash(struct mv_host_priv *hpriv, void __iomem *mmio);
static void mv5_reset_bus(struct ata_host *host, void __iomem *mmio);

static void mv6_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
                           unsigned int port);
static void mv6_enable_leds(struct mv_host_priv *hpriv, void __iomem *mmio);
static void mv6_read_preamp(struct mv_host_priv *hpriv, int idx,
                           void __iomem *mmio);
static int mv6_reset_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
                        unsigned int n_hc);
static void mv6_reset_flash(struct mv_host_priv *hpriv, void __iomem *mmio);
static void mv_soc_enable_leds(struct mv_host_priv *hpriv,
                                      void __iomem *mmio);
static void mv_soc_read_preamp(struct mv_host_priv *hpriv, int idx,
                                      void __iomem *mmio);
static int mv_soc_reset_hc(struct mv_host_priv *hpriv,
                                  void __iomem *mmio, unsigned int n_hc);
static void mv_soc_reset_flash(struct mv_host_priv *hpriv,
                                      void __iomem *mmio);
static void mv_soc_reset_bus(struct ata_host *host, void __iomem *mmio);
static void mv_reset_pci_bus(struct ata_host *host, void __iomem *mmio);
static void mv_reset_channel(struct mv_host_priv *hpriv, void __iomem *mmio,
                             unsigned int port_no);
static int mv_stop_edma(struct ata_port *ap);
static int mv_stop_edma_engine(void __iomem *port_mmio);
static void mv_edma_cfg(struct ata_port *ap, int want_ncq, int want_edma);

static void mv_pmp_select(struct ata_port *ap, int pmp);
static int mv_pmp_hardreset(struct ata_link *link, unsigned int *class,
                                unsigned long deadline);
static int  mv_softreset(struct ata_link *link, unsigned int *class,
                                unsigned long deadline);
static void mv_pmp_error_handler(struct ata_port *ap);
static void mv_process_crpb_entries(struct ata_port *ap,
                                        struct mv_port_priv *pp);

static unsigned long mv_mode_filter(struct ata_device *dev,
                                    unsigned long xfer_mask);
static void mv_sff_irq_clear(struct ata_port *ap);
static int mv_check_atapi_dma(struct ata_queued_cmd *qc);
static void mv_bmdma_setup(struct ata_queued_cmd *qc);
static void mv_bmdma_start(struct ata_queued_cmd *qc);
static void mv_bmdma_stop(struct ata_queued_cmd *qc);
static u8   mv_bmdma_status(struct ata_port *ap);

/* .sg_tablesize is (MV_MAX_SG_CT / 2) in the structures below
 * because we have to allow room for worst case splitting of
 * PRDs for 64K boundaries in mv_fill_sg().
 */
static struct scsi_host_template mv5_sht = {
        ATA_BASE_SHT(DRV_NAME),
        .sg_tablesize           = MV_MAX_SG_CT / 2,
        .dma_boundary           = MV_DMA_BOUNDARY,
};

static struct scsi_host_template mv6_sht = {
        ATA_NCQ_SHT(DRV_NAME),
        .can_queue              = MV_MAX_Q_DEPTH - 1,
        .sg_tablesize           = MV_MAX_SG_CT / 2,
        .dma_boundary           = MV_DMA_BOUNDARY,
};

static struct ata_port_operations mv5_ops = {
        .inherits               = &ata_sff_port_ops,

        .qc_defer               = mv_qc_defer,
        .qc_prep                = mv_qc_prep,
        .qc_issue               = mv_qc_issue,

        .freeze                 = mv_eh_freeze,
        .thaw                   = mv_eh_thaw,
        .hardreset              = mv_hardreset,
        .error_handler          = ata_std_error_handler, /* avoid SFF EH */
        .post_internal_cmd      = ATA_OP_NULL,

        .scr_read               = mv5_scr_read,
        .scr_write              = mv5_scr_write,

        .port_start             = mv_port_start,
        .port_stop              = mv_port_stop,
};

static struct ata_port_operations mv6_ops = {
        .inherits               = &mv5_ops,
        .dev_config             = mv6_dev_config,
        .scr_read               = mv_scr_read,
        .scr_write              = mv_scr_write,

        .pmp_hardreset          = mv_pmp_hardreset,
        .pmp_softreset          = mv_softreset,
        .softreset              = mv_softreset,
        .error_handler          = mv_pmp_error_handler,

        .sff_irq_clear          = mv_sff_irq_clear,
        .check_atapi_dma        = mv_check_atapi_dma,
        .bmdma_setup            = mv_bmdma_setup,
        .bmdma_start            = mv_bmdma_start,
        .bmdma_stop             = mv_bmdma_stop,
        .bmdma_status           = mv_bmdma_status,
        .mode_filter            = mv_mode_filter,
};

static struct ata_port_operations mv_iie_ops = {
        .inherits               = &mv6_ops,
        .dev_config             = ATA_OP_NULL,
        .qc_prep                = mv_qc_prep_iie,
};

static const struct ata_port_info mv_port_info[] = {
        {  /* chip_504x */
                .flags          = MV_GEN_I_FLAGS,
                .pio_mask       = 0x1f, /* pio0-4 */
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &mv5_ops,
        },
        {  /* chip_508x */
                .flags          = MV_GEN_I_FLAGS | MV_FLAG_DUAL_HC,
                .pio_mask       = 0x1f, /* pio0-4 */
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &mv5_ops,
        },
        {  /* chip_5080 */
                .flags          = MV_GEN_I_FLAGS | MV_FLAG_DUAL_HC,
                .pio_mask       = 0x1f, /* pio0-4 */
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &mv5_ops,
        },
        {  /* chip_604x */
                .flags          = MV_GEN_II_FLAGS,
                .pio_mask       = 0x1f, /* pio0-4 */
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &mv6_ops,
        },
        {  /* chip_608x */
                .flags          = MV_GEN_II_FLAGS | MV_FLAG_DUAL_HC,
                .pio_mask       = 0x1f, /* pio0-4 */
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &mv6_ops,
        },
        {  /* chip_6042 */
                .flags          = MV_GEN_IIE_FLAGS,
                .pio_mask       = 0x1f, /* pio0-4 */
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &mv_iie_ops,
        },
        {  /* chip_7042 */
                .flags          = MV_GEN_IIE_FLAGS,
                .pio_mask       = 0x1f, /* pio0-4 */
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &mv_iie_ops,
        },
        {  /* chip_soc */
                .flags          = MV_GEN_IIE_FLAGS,
                .pio_mask       = 0x1f, /* pio0-4 */
                .udma_mask      = ATA_UDMA6,
                .port_ops       = &mv_iie_ops,
        },
};

static const struct pci_device_id mv_pci_tbl[] = {
        { PCI_VDEVICE(MARVELL, 0x5040), chip_504x },
        { PCI_VDEVICE(MARVELL, 0x5041), chip_504x },
        { PCI_VDEVICE(MARVELL, 0x5080), chip_5080 },
        { PCI_VDEVICE(MARVELL, 0x5081), chip_508x },
        /* RocketRAID 1720/174x have different identifiers */
        { PCI_VDEVICE(TTI, 0x1720), chip_6042 },
        { PCI_VDEVICE(TTI, 0x1740), chip_6042 },
        { PCI_VDEVICE(TTI, 0x1742), chip_6042 },

        { PCI_VDEVICE(MARVELL, 0x6040), chip_604x },
        { PCI_VDEVICE(MARVELL, 0x6041), chip_604x },
        { PCI_VDEVICE(MARVELL, 0x6042), chip_6042 },
        { PCI_VDEVICE(MARVELL, 0x6080), chip_608x },
        { PCI_VDEVICE(MARVELL, 0x6081), chip_608x },

        { PCI_VDEVICE(ADAPTEC2, 0x0241), chip_604x },

        /* Adaptec 1430SA */
        { PCI_VDEVICE(ADAPTEC2, 0x0243), chip_7042 },

        /* Marvell 7042 support */
        { PCI_VDEVICE(MARVELL, 0x7042), chip_7042 },

        /* Highpoint RocketRAID PCIe series */
        { PCI_VDEVICE(TTI, 0x2300), chip_7042 },
        { PCI_VDEVICE(TTI, 0x2310), chip_7042 },

        { }                     /* terminate list */
};

static const struct mv_hw_ops mv5xxx_ops = {
        .phy_errata             = mv5_phy_errata,
        .enable_leds            = mv5_enable_leds,
        .read_preamp            = mv5_read_preamp,
        .reset_hc               = mv5_reset_hc,
        .reset_flash            = mv5_reset_flash,
        .reset_bus              = mv5_reset_bus,
};

static const struct mv_hw_ops mv6xxx_ops = {
        .phy_errata             = mv6_phy_errata,
        .enable_leds            = mv6_enable_leds,
        .read_preamp            = mv6_read_preamp,
        .reset_hc               = mv6_reset_hc,
        .reset_flash            = mv6_reset_flash,
        .reset_bus              = mv_reset_pci_bus,
};

static const struct mv_hw_ops mv_soc_ops = {
        .phy_errata             = mv6_phy_errata,
        .enable_leds            = mv_soc_enable_leds,
        .read_preamp            = mv_soc_read_preamp,
        .reset_hc               = mv_soc_reset_hc,
        .reset_flash            = mv_soc_reset_flash,
        .reset_bus              = mv_soc_reset_bus,
};

/*
 * Functions
 */

static inline void writelfl(unsigned long data, void __iomem *addr)
{
        writel(data, addr);
        (void) readl(addr);     /* flush to avoid PCI posted write */
}

static inline unsigned int mv_hc_from_port(unsigned int port)
{
        return port >> MV_PORT_HC_SHIFT;
}

static inline unsigned int mv_hardport_from_port(unsigned int port)
{
        return port & MV_PORT_MASK;
}

/*
 * Consolidate some rather tricky bit shift calculations.
 * This is hot-path stuff, so not a function.
 * Simple code, with two return values, so macro rather than inline.
 *
 * port is the sole input, in range 0..7.
 * shift is one output, for use with main_irq_cause / main_irq_mask registers.
 * hardport is the other output, in range 0..3.
 *
 * Note that port and hardport may be the same variable in some cases.
 */
#define MV_PORT_TO_SHIFT_AND_HARDPORT(port, shift, hardport)    \
{                                                               \
        shift    = mv_hc_from_port(port) * HC_SHIFT;            \
        hardport = mv_hardport_from_port(port);                 \
        shift   += hardport * 2;                                \
}

static inline void __iomem *mv_hc_base(void __iomem *base, unsigned int hc)
{
        return (base + MV_SATAHC0_REG_BASE + (hc * MV_SATAHC_REG_SZ));
}

static inline void __iomem *mv_hc_base_from_port(void __iomem *base,
                                                 unsigned int port)
{
        return mv_hc_base(base, mv_hc_from_port(port));
}

static inline void __iomem *mv_port_base(void __iomem *base, unsigned int port)
{
        return  mv_hc_base_from_port(base, port) +
                MV_SATAHC_ARBTR_REG_SZ +
                (mv_hardport_from_port(port) * MV_PORT_REG_SZ);
}

static void __iomem *mv5_phy_base(void __iomem *mmio, unsigned int port)
{
        void __iomem *hc_mmio = mv_hc_base_from_port(mmio, port);
        unsigned long ofs = (mv_hardport_from_port(port) + 1) * 0x100UL;

        return hc_mmio + ofs;
}

static inline void __iomem *mv_host_base(struct ata_host *host)
{
        struct mv_host_priv *hpriv = host->private_data;
        return hpriv->base;
}

static inline void __iomem *mv_ap_base(struct ata_port *ap)
{
        return mv_port_base(mv_host_base(ap->host), ap->port_no);
}

static inline int mv_get_hc_count(unsigned long port_flags)
{
        return ((port_flags & MV_FLAG_DUAL_HC) ? 2 : 1);
}

static void mv_set_edma_ptrs(void __iomem *port_mmio,
                             struct mv_host_priv *hpriv,
                             struct mv_port_priv *pp)
{
        u32 index;

        /*
         * initialize request queue
         */
        pp->req_idx &= MV_MAX_Q_DEPTH_MASK;     /* paranoia */
        index = pp->req_idx << EDMA_REQ_Q_PTR_SHIFT;

        WARN_ON(pp->crqb_dma & 0x3ff);
        writel((pp->crqb_dma >> 16) >> 16, port_mmio + EDMA_REQ_Q_BASE_HI_OFS);
        writelfl((pp->crqb_dma & EDMA_REQ_Q_BASE_LO_MASK) | index,
                 port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
        writelfl(index, port_mmio + EDMA_REQ_Q_OUT_PTR_OFS);

        /*
         * initialize response queue
         */
        pp->resp_idx &= MV_MAX_Q_DEPTH_MASK;    /* paranoia */
        index = pp->resp_idx << EDMA_RSP_Q_PTR_SHIFT;

        WARN_ON(pp->crpb_dma & 0xff);
        writel((pp->crpb_dma >> 16) >> 16, port_mmio + EDMA_RSP_Q_BASE_HI_OFS);
        writelfl(index, port_mmio + EDMA_RSP_Q_IN_PTR_OFS);
        writelfl((pp->crpb_dma & EDMA_RSP_Q_BASE_LO_MASK) | index,
                 port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
}

static void mv_set_main_irq_mask(struct ata_host *host,
                                 u32 disable_bits, u32 enable_bits)
{
        struct mv_host_priv *hpriv = host->private_data;
        u32 old_mask, new_mask;

        old_mask = hpriv->main_irq_mask;
        new_mask = (old_mask & ~disable_bits) | enable_bits;
        if (new_mask != old_mask) {
                hpriv->main_irq_mask = new_mask;
                writelfl(new_mask, hpriv->main_irq_mask_addr);
        }
}

static void mv_enable_port_irqs(struct ata_port *ap,
                                     unsigned int port_bits)
{
        unsigned int shift, hardport, port = ap->port_no;
        u32 disable_bits, enable_bits;

        MV_PORT_TO_SHIFT_AND_HARDPORT(port, shift, hardport);

        disable_bits = (DONE_IRQ | ERR_IRQ) << shift;
        enable_bits  = port_bits << shift;
        mv_set_main_irq_mask(ap->host, disable_bits, enable_bits);
}

static void mv_clear_and_enable_port_irqs(struct ata_port *ap,
                                          void __iomem *port_mmio,
                                          unsigned int port_irqs)
{
        struct mv_host_priv *hpriv = ap->host->private_data;
        int hardport = mv_hardport_from_port(ap->port_no);
        void __iomem *hc_mmio = mv_hc_base_from_port(
                                mv_host_base(ap->host), ap->port_no);
        u32 hc_irq_cause;

        /* clear EDMA event indicators, if any */
        writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);

        /* clear pending irq events */
        hc_irq_cause = ~((DEV_IRQ | DMA_IRQ) << hardport);
        writelfl(hc_irq_cause, hc_mmio + HC_IRQ_CAUSE_OFS);

        /* clear FIS IRQ Cause */
        if (IS_GEN_IIE(hpriv))
                writelfl(0, port_mmio + SATA_FIS_IRQ_CAUSE_OFS);

        mv_enable_port_irqs(ap, port_irqs);
}

/**
 *      mv_start_edma - Enable eDMA engine
 *      @base: port base address
 *      @pp: port private data
 *
 *      Verify the local cache of the eDMA state is accurate with a
 *      WARN_ON.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_start_edma(struct ata_port *ap, void __iomem *port_mmio,
                         struct mv_port_priv *pp, u8 protocol)
{
        int want_ncq = (protocol == ATA_PROT_NCQ);

        if (pp->pp_flags & MV_PP_FLAG_EDMA_EN) {
                int using_ncq = ((pp->pp_flags & MV_PP_FLAG_NCQ_EN) != 0);
                if (want_ncq != using_ncq)
                        mv_stop_edma(ap);
        }
        if (!(pp->pp_flags & MV_PP_FLAG_EDMA_EN)) {
                struct mv_host_priv *hpriv = ap->host->private_data;

                mv_edma_cfg(ap, want_ncq, 1);

                mv_set_edma_ptrs(port_mmio, hpriv, pp);
                mv_clear_and_enable_port_irqs(ap, port_mmio, DONE_IRQ|ERR_IRQ);

                writelfl(EDMA_EN, port_mmio + EDMA_CMD_OFS);
                pp->pp_flags |= MV_PP_FLAG_EDMA_EN;
        }
}

static void mv_wait_for_edma_empty_idle(struct ata_port *ap)
{
        void __iomem *port_mmio = mv_ap_base(ap);
        const u32 empty_idle = (EDMA_STATUS_CACHE_EMPTY | EDMA_STATUS_IDLE);
        const int per_loop = 5, timeout = (15 * 1000 / per_loop);
        int i;

        /*
         * Wait for the EDMA engine to finish transactions in progress.
         * No idea what a good "timeout" value might be, but measurements
         * indicate that it often requires hundreds of microseconds
         * with two drives in-use.  So we use the 15msec value above
         * as a rough guess at what even more drives might require.
         */
        for (i = 0; i < timeout; ++i) {
                u32 edma_stat = readl(port_mmio + EDMA_STATUS_OFS);
                if ((edma_stat & empty_idle) == empty_idle)
                        break;
                udelay(per_loop);
        }
        /* ata_port_printk(ap, KERN_INFO, "%s: %u+ usecs\n", __func__, i); */
}

/**
 *      mv_stop_edma_engine - Disable eDMA engine
 *      @port_mmio: io base address
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static int mv_stop_edma_engine(void __iomem *port_mmio)
{
        int i;

        /* Disable eDMA.  The disable bit auto clears. */
        writelfl(EDMA_DS, port_mmio + EDMA_CMD_OFS);

        /* Wait for the chip to confirm eDMA is off. */
        for (i = 10000; i > 0; i--) {
                u32 reg = readl(port_mmio + EDMA_CMD_OFS);
                if (!(reg & EDMA_EN))
                        return 0;
                udelay(10);
        }
        return -EIO;
}

static int mv_stop_edma(struct ata_port *ap)
{
        void __iomem *port_mmio = mv_ap_base(ap);
        struct mv_port_priv *pp = ap->private_data;
        int err = 0;

        if (!(pp->pp_flags & MV_PP_FLAG_EDMA_EN))
                return 0;
        pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
        mv_wait_for_edma_empty_idle(ap);
        if (mv_stop_edma_engine(port_mmio)) {
                ata_port_printk(ap, KERN_ERR, "Unable to stop eDMA\n");
                err = -EIO;
        }
        mv_edma_cfg(ap, 0, 0);
        return err;
}

#ifdef ATA_DEBUG
static void mv_dump_mem(void __iomem *start, unsigned bytes)
{
        int b, w;
        for (b = 0; b < bytes; ) {
                DPRINTK("%p: ", start + b);
                for (w = 0; b < bytes && w < 4; w++) {
                        printk("%08x ", readl(start + b));
                        b += sizeof(u32);
                }
                printk("\n");
        }
}
#endif

static void mv_dump_pci_cfg(struct pci_dev *pdev, unsigned bytes)
{
#ifdef ATA_DEBUG
        int b, w;
        u32 dw;
        for (b = 0; b < bytes; ) {
                DPRINTK("%02x: ", b);
                for (w = 0; b < bytes && w < 4; w++) {
                        (void) pci_read_config_dword(pdev, b, &dw);
                        printk("%08x ", dw);
                        b += sizeof(u32);
                }
                printk("\n");
        }
#endif
}
static void mv_dump_all_regs(void __iomem *mmio_base, int port,
                             struct pci_dev *pdev)
{
#ifdef ATA_DEBUG
        void __iomem *hc_base = mv_hc_base(mmio_base,
                                           port >> MV_PORT_HC_SHIFT);
        void __iomem *port_base;
        int start_port, num_ports, p, start_hc, num_hcs, hc;

        if (0 > port) {
                start_hc = start_port = 0;
                num_ports = 8;          /* shld be benign for 4 port devs */
                num_hcs = 2;
        } else {
                start_hc = port >> MV_PORT_HC_SHIFT;
                start_port = port;
                num_ports = num_hcs = 1;
        }
        DPRINTK("All registers for port(s) %u-%u:\n", start_port,
                num_ports > 1 ? num_ports - 1 : start_port);

        if (NULL != pdev) {
                DPRINTK("PCI config space regs:\n");
                mv_dump_pci_cfg(pdev, 0x68);
        }
        DPRINTK("PCI regs:\n");
        mv_dump_mem(mmio_base+0xc00, 0x3c);
        mv_dump_mem(mmio_base+0xd00, 0x34);
        mv_dump_mem(mmio_base+0xf00, 0x4);
        mv_dump_mem(mmio_base+0x1d00, 0x6c);
        for (hc = start_hc; hc < start_hc + num_hcs; hc++) {
                hc_base = mv_hc_base(mmio_base, hc);
                DPRINTK("HC regs (HC %i):\n", hc);
                mv_dump_mem(hc_base, 0x1c);
        }
        for (p = start_port; p < start_port + num_ports; p++) {
                port_base = mv_port_base(mmio_base, p);
                DPRINTK("EDMA regs (port %i):\n", p);
                mv_dump_mem(port_base, 0x54);
                DPRINTK("SATA regs (port %i):\n", p);
                mv_dump_mem(port_base+0x300, 0x60);
        }
#endif
}

static unsigned int mv_scr_offset(unsigned int sc_reg_in)
{
        unsigned int ofs;

        switch (sc_reg_in) {
        case SCR_STATUS:
        case SCR_CONTROL:
        case SCR_ERROR:
                ofs = SATA_STATUS_OFS + (sc_reg_in * sizeof(u32));
                break;
        case SCR_ACTIVE:
                ofs = SATA_ACTIVE_OFS;   /* active is not with the others */
                break;
        default:
                ofs = 0xffffffffU;
                break;
        }
        return ofs;
}

static int mv_scr_read(struct ata_link *link, unsigned int sc_reg_in, u32 *val)
{
        unsigned int ofs = mv_scr_offset(sc_reg_in);

        if (ofs != 0xffffffffU) {
                *val = readl(mv_ap_base(link->ap) + ofs);
                return 0;
        } else
                return -EINVAL;
}

static int mv_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val)
{
        unsigned int ofs = mv_scr_offset(sc_reg_in);

        if (ofs != 0xffffffffU) {
                writelfl(val, mv_ap_base(link->ap) + ofs);
                return 0;
        } else
                return -EINVAL;
}

static void mv6_dev_config(struct ata_device *adev)
{
        /*
         * Deal with Gen-II ("mv6") hardware quirks/restrictions:
         *
         * Gen-II does not support NCQ over a port multiplier
         *  (no FIS-based switching).
         */
        if (adev->flags & ATA_DFLAG_NCQ) {
                if (sata_pmp_attached(adev->link->ap)) {
                        adev->flags &= ~ATA_DFLAG_NCQ;
                        ata_dev_printk(adev, KERN_INFO,
                                "NCQ disabled for command-based switching\n");
                }
        }
}

static int mv_qc_defer(struct ata_queued_cmd *qc)
{
        struct ata_link *link = qc->dev->link;
        struct ata_port *ap = link->ap;
        struct mv_port_priv *pp = ap->private_data;

        /*
         * Don't allow new commands if we're in a delayed EH state
         * for NCQ and/or FIS-based switching.
         */
        if (pp->pp_flags & MV_PP_FLAG_DELAYED_EH)
                return ATA_DEFER_PORT;
        /*
         * If the port is completely idle, then allow the new qc.
         */
        if (ap->nr_active_links == 0)
                return 0;

        /*
         * The port is operating in host queuing mode (EDMA) with NCQ
         * enabled, allow multiple NCQ commands.  EDMA also allows
         * queueing multiple DMA commands but libata core currently
         * doesn't allow it.
         */
        if ((pp->pp_flags & MV_PP_FLAG_EDMA_EN) &&
            (pp->pp_flags & MV_PP_FLAG_NCQ_EN) && ata_is_ncq(qc->tf.protocol))
                return 0;

        return ATA_DEFER_PORT;
}

static void mv_config_fbs(void __iomem *port_mmio, int want_ncq, int want_fbs)
{
        u32 new_fiscfg, old_fiscfg;
        u32 new_ltmode, old_ltmode;
        u32 new_haltcond, old_haltcond;

        old_fiscfg   = readl(port_mmio + FISCFG_OFS);
        old_ltmode   = readl(port_mmio + LTMODE_OFS);
        old_haltcond = readl(port_mmio + EDMA_HALTCOND_OFS);

        new_fiscfg   = old_fiscfg & ~(FISCFG_SINGLE_SYNC | FISCFG_WAIT_DEV_ERR);
        new_ltmode   = old_ltmode & ~LTMODE_BIT8;
        new_haltcond = old_haltcond | EDMA_ERR_DEV;

        if (want_fbs) {
                new_fiscfg = old_fiscfg | FISCFG_SINGLE_SYNC;
                new_ltmode = old_ltmode | LTMODE_BIT8;
                if (want_ncq)
                        new_haltcond &= ~EDMA_ERR_DEV;
                else
                        new_fiscfg |=  FISCFG_WAIT_DEV_ERR;
        }

        if (new_fiscfg != old_fiscfg)
                writelfl(new_fiscfg, port_mmio + FISCFG_OFS);
        if (new_ltmode != old_ltmode)
                writelfl(new_ltmode, port_mmio + LTMODE_OFS);
        if (new_haltcond != old_haltcond)
                writelfl(new_haltcond, port_mmio + EDMA_HALTCOND_OFS);
}

static void mv_60x1_errata_sata25(struct ata_port *ap, int want_ncq)
{
        struct mv_host_priv *hpriv = ap->host->private_data;
        u32 old, new;

        /* workaround for 88SX60x1 FEr SATA#25 (part 1) */
        old = readl(hpriv->base + MV_GPIO_PORT_CTL_OFS);
        if (want_ncq)
                new = old | (1 << 22);
        else
                new = old & ~(1 << 22);
        if (new != old)
                writel(new, hpriv->base + MV_GPIO_PORT_CTL_OFS);
}

static void mv_edma_cfg(struct ata_port *ap, int want_ncq, int want_edma)
{
        u32 cfg;
        struct mv_port_priv *pp    = ap->private_data;
        struct mv_host_priv *hpriv = ap->host->private_data;
        void __iomem *port_mmio    = mv_ap_base(ap);

        /* set up non-NCQ EDMA configuration */
        cfg = EDMA_CFG_Q_DEPTH;         /* always 0x1f for *all* chips */
        pp->pp_flags &= ~(MV_PP_FLAG_FBS_EN | MV_PP_FLAG_NCQ_EN);

        if (IS_GEN_I(hpriv))
                cfg |= (1 << 8);        /* enab config burst size mask */

        else if (IS_GEN_II(hpriv)) {
                cfg |= EDMA_CFG_RD_BRST_EXT | EDMA_CFG_WR_BUFF_LEN;
                mv_60x1_errata_sata25(ap, want_ncq);

        } else if (IS_GEN_IIE(hpriv)) {
                int want_fbs = sata_pmp_attached(ap);
                /*
                 * Possible future enhancement:
                 *
                 * The chip can use FBS with non-NCQ, if we allow it,
                 * But first we need to have the error handling in place
                 * for this mode (datasheet section 7.3.15.4.2.3).
                 * So disallow non-NCQ FBS for now.
                 */
                want_fbs &= want_ncq;

                mv_config_fbs(port_mmio, want_ncq, want_fbs);

                if (want_fbs) {
                        pp->pp_flags |= MV_PP_FLAG_FBS_EN;
                        cfg |= EDMA_CFG_EDMA_FBS; /* FIS-based switching */
                }

                cfg |= (1 << 23);       /* do not mask PM field in rx'd FIS */
                if (want_edma) {
                        cfg |= (1 << 22); /* enab 4-entry host queue cache */
                        if (!IS_SOC(hpriv))
                                cfg |= (1 << 18); /* enab early completion */
                }
                if (hpriv->hp_flags & MV_HP_CUT_THROUGH)
                        cfg |= (1 << 17); /* enab cut-thru (dis stor&forwrd) */
        }

        if (want_ncq) {
                cfg |= EDMA_CFG_NCQ;
                pp->pp_flags |=  MV_PP_FLAG_NCQ_EN;
        }

        writelfl(cfg, port_mmio + EDMA_CFG_OFS);
}

static void mv_port_free_dma_mem(struct ata_port *ap)
{
        struct mv_host_priv *hpriv = ap->host->private_data;
        struct mv_port_priv *pp = ap->private_data;
        int tag;

        if (pp->crqb) {
                dma_pool_free(hpriv->crqb_pool, pp->crqb, pp->crqb_dma);
                pp->crqb = NULL;
        }
        if (pp->crpb) {
                dma_pool_free(hpriv->crpb_pool, pp->crpb, pp->crpb_dma);
                pp->crpb = NULL;
        }
        /*
         * For GEN_I, there's no NCQ, so we have only a single sg_tbl.
         * For later hardware, we have one unique sg_tbl per NCQ tag.
         */
        for (tag = 0; tag < MV_MAX_Q_DEPTH; ++tag) {
                if (pp->sg_tbl[tag]) {
                        if (tag == 0 || !IS_GEN_I(hpriv))
                                dma_pool_free(hpriv->sg_tbl_pool,
                                              pp->sg_tbl[tag],
                                              pp->sg_tbl_dma[tag]);
                        pp->sg_tbl[tag] = NULL;
                }
        }
}

/**
 *      mv_port_start - Port specific init/start routine.
 *      @ap: ATA channel to manipulate
 *
 *      Allocate and point to DMA memory, init port private memory,
 *      zero indices.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static int mv_port_start(struct ata_port *ap)
{
        struct device *dev = ap->host->dev;
        struct mv_host_priv *hpriv = ap->host->private_data;
        struct mv_port_priv *pp;
        int tag;

        pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
        if (!pp)
                return -ENOMEM;
        ap->private_data = pp;

        pp->crqb = dma_pool_alloc(hpriv->crqb_pool, GFP_KERNEL, &pp->crqb_dma);
        if (!pp->crqb)
                return -ENOMEM;
        memset(pp->crqb, 0, MV_CRQB_Q_SZ);

        pp->crpb = dma_pool_alloc(hpriv->crpb_pool, GFP_KERNEL, &pp->crpb_dma);
        if (!pp->crpb)
                goto out_port_free_dma_mem;
        memset(pp->crpb, 0, MV_CRPB_Q_SZ);

        /* 6041/6081 Rev. "C0" (and newer) are okay with async notify */
        if (hpriv->hp_flags & MV_HP_ERRATA_60X1C0)
                ap->flags |= ATA_FLAG_AN;
        /*
         * For GEN_I, there's no NCQ, so we only allocate a single sg_tbl.
         * For later hardware, we need one unique sg_tbl per NCQ tag.
         */
        for (tag = 0; tag < MV_MAX_Q_DEPTH; ++tag) {
                if (tag == 0 || !IS_GEN_I(hpriv)) {
                        pp->sg_tbl[tag] = dma_pool_alloc(hpriv->sg_tbl_pool,
                                              GFP_KERNEL, &pp->sg_tbl_dma[tag]);
                        if (!pp->sg_tbl[tag])
                                goto out_port_free_dma_mem;
                } else {
                        pp->sg_tbl[tag]     = pp->sg_tbl[0];
                        pp->sg_tbl_dma[tag] = pp->sg_tbl_dma[0];
                }
        }
        mv_edma_cfg(ap, 0, 0);
        return 0;

out_port_free_dma_mem:
        mv_port_free_dma_mem(ap);
        return -ENOMEM;
}

/**
 *      mv_port_stop - Port specific cleanup/stop routine.
 *      @ap: ATA channel to manipulate
 *
 *      Stop DMA, cleanup port memory.
 *
 *      LOCKING:
 *      This routine uses the host lock to protect the DMA stop.
 */
static void mv_port_stop(struct ata_port *ap)
{
        mv_stop_edma(ap);
        mv_enable_port_irqs(ap, 0);
        mv_port_free_dma_mem(ap);
}

/**
 *      mv_fill_sg - Fill out the Marvell ePRD (scatter gather) entries
 *      @qc: queued command whose SG list to source from
 *
 *      Populate the SG list and mark the last entry.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_fill_sg(struct ata_queued_cmd *qc)
{
        struct mv_port_priv *pp = qc->ap->private_data;
        struct scatterlist *sg;
        struct mv_sg *mv_sg, *last_sg = NULL;
        unsigned int si;

        mv_sg = pp->sg_tbl[qc->tag];
        for_each_sg(qc->sg, sg, qc->n_elem, si) {
                dma_addr_t addr = sg_dma_address(sg);
                u32 sg_len = sg_dma_len(sg);

                while (sg_len) {
                        u32 offset = addr & 0xffff;
                        u32 len = sg_len;

                        if (offset + len > 0x10000)
                                len = 0x10000 - offset;

                        mv_sg->addr = cpu_to_le32(addr & 0xffffffff);
                        mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
                        mv_sg->flags_size = cpu_to_le32(len & 0xffff);
                        mv_sg->reserved = 0;

                        sg_len -= len;
                        addr += len;

                        last_sg = mv_sg;
                        mv_sg++;
                }
        }

        if (likely(last_sg))
                last_sg->flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL);
        mb(); /* ensure data structure is visible to the chipset */
}

static void mv_crqb_pack_cmd(__le16 *cmdw, u8 data, u8 addr, unsigned last)
{
        u16 tmp = data | (addr << CRQB_CMD_ADDR_SHIFT) | CRQB_CMD_CS |
                (last ? CRQB_CMD_LAST : 0);
        *cmdw = cpu_to_le16(tmp);
}

/**
 *      mv_mode_filter - Allow ATAPI DMA only on GenII chips.
 *      @dev: device whose xfer modes are being configured.
 *
 *      Only the GenII hardware can use DMA with ATAPI drives.
 */
static unsigned long mv_mode_filter(struct ata_device *adev,
                                    unsigned long xfer_mask)
{
        if (adev->class == ATA_DEV_ATAPI) {
                struct mv_host_priv *hpriv = adev->link->ap->host->private_data;
                if (!IS_GEN_II(hpriv)) {
                        xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
                        ata_dev_printk(adev, KERN_INFO,
                                "ATAPI DMA not supported on this chipset\n");
                }
        }
        return xfer_mask;
}

/**
 *      mv_sff_irq_clear - Clear hardware interrupt after DMA.
 *      @ap: Port associated with this ATA transaction.
 *
 *      We need this only for ATAPI bmdma transactions,
 *      as otherwise we experience spurious interrupts
 *      after libata-sff handles the bmdma interrupts.
 */
static void mv_sff_irq_clear(struct ata_port *ap)
{
        mv_clear_and_enable_port_irqs(ap, mv_ap_base(ap), ERR_IRQ);
}

/**
 *      mv_check_atapi_dma - Filter ATAPI cmds which are unsuitable for DMA.
 *      @qc: queued command to check for chipset/DMA compatibility.
 *
 *      The bmdma engines cannot handle speculative data sizes
 *      (bytecount under/over flow).  So only allow DMA for
 *      data transfer commands with known data sizes.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static int mv_check_atapi_dma(struct ata_queued_cmd *qc)
{
        struct scsi_cmnd *scmd = qc->scsicmd;

        if (scmd) {
                switch (scmd->cmnd[0]) {
                case READ_6:
                case READ_10:
                case READ_12:
                case WRITE_6:
                case WRITE_10:
                case WRITE_12:
                case GPCMD_READ_CD:
                case GPCMD_SEND_DVD_STRUCTURE:
                case GPCMD_SEND_CUE_SHEET:
                        return 0; /* DMA is safe */
                }
        }
        return -EOPNOTSUPP; /* use PIO instead */
}

/**
 *      mv_bmdma_setup - Set up BMDMA transaction
 *      @qc: queued command to prepare DMA for.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_bmdma_setup(struct ata_queued_cmd *qc)
{
        struct ata_port *ap = qc->ap;
        void __iomem *port_mmio = mv_ap_base(ap);
        struct mv_port_priv *pp = ap->private_data;

        mv_fill_sg(qc);

        /* clear all DMA cmd bits */
        writel(0, port_mmio + BMDMA_CMD_OFS);

        /* load PRD table addr. */
        writel((pp->sg_tbl_dma[qc->tag] >> 16) >> 16,
                port_mmio + BMDMA_PRD_HIGH_OFS);
        writelfl(pp->sg_tbl_dma[qc->tag],
                port_mmio + BMDMA_PRD_LOW_OFS);

        /* issue r/w command */
        ap->ops->sff_exec_command(ap, &qc->tf);
}

/**
 *      mv_bmdma_start - Start a BMDMA transaction
 *      @qc: queued command to start DMA on.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_bmdma_start(struct ata_queued_cmd *qc)
{
        struct ata_port *ap = qc->ap;
        void __iomem *port_mmio = mv_ap_base(ap);
        unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
        u32 cmd = (rw ? 0 : ATA_DMA_WR) | ATA_DMA_START;

        /* start host DMA transaction */
        writelfl(cmd, port_mmio + BMDMA_CMD_OFS);
}

/**
 *      mv_bmdma_stop - Stop BMDMA transfer
 *      @qc: queued command to stop DMA on.
 *
 *      Clears the ATA_DMA_START flag in the bmdma control register
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_bmdma_stop(struct ata_queued_cmd *qc)
{
        struct ata_port *ap = qc->ap;
        void __iomem *port_mmio = mv_ap_base(ap);
        u32 cmd;

        /* clear start/stop bit */
        cmd = readl(port_mmio + BMDMA_CMD_OFS);
        cmd &= ~ATA_DMA_START;
        writelfl(cmd, port_mmio + BMDMA_CMD_OFS);

        /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
        ata_sff_dma_pause(ap);
}

/**
 *      mv_bmdma_status - Read BMDMA status
 *      @ap: port for which to retrieve DMA status.
 *
 *      Read and return equivalent of the sff BMDMA status register.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static u8 mv_bmdma_status(struct ata_port *ap)
{
        void __iomem *port_mmio = mv_ap_base(ap);
        u32 reg, status;

        /*
         * Other bits are valid only if ATA_DMA_ACTIVE==0,
         * and the ATA_DMA_INTR bit doesn't exist.
         */
        reg = readl(port_mmio + BMDMA_STATUS_OFS);
        if (reg & ATA_DMA_ACTIVE)
                status = ATA_DMA_ACTIVE;
        else
                status = (reg & ATA_DMA_ERR) | ATA_DMA_INTR;
        return status;
}

/**
 *      mv_qc_prep - Host specific command preparation.
 *      @qc: queued command to prepare
 *
 *      This routine simply redirects to the general purpose routine
 *      if command is not DMA.  Else, it handles prep of the CRQB
 *      (command request block), does some sanity checking, and calls
 *      the SG load routine.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_qc_prep(struct ata_queued_cmd *qc)
{
        struct ata_port *ap = qc->ap;
        struct mv_port_priv *pp = ap->private_data;
        __le16 *cw;
        struct ata_taskfile *tf;
        u16 flags = 0;
        unsigned in_index;

        if ((qc->tf.protocol != ATA_PROT_DMA) &&
            (qc->tf.protocol != ATA_PROT_NCQ))
                return;

        /* Fill in command request block
         */
        if (!(qc->tf.flags & ATA_TFLAG_WRITE))
                flags |= CRQB_FLAG_READ;
        WARN_ON(MV_MAX_Q_DEPTH <= qc->tag);
        flags |= qc->tag << CRQB_TAG_SHIFT;
        flags |= (qc->dev->link->pmp & 0xf) << CRQB_PMP_SHIFT;

        /* get current queue index from software */
        in_index = pp->req_idx;

        pp->crqb[in_index].sg_addr =
                cpu_to_le32(pp->sg_tbl_dma[qc->tag] & 0xffffffff);
        pp->crqb[in_index].sg_addr_hi =
                cpu_to_le32((pp->sg_tbl_dma[qc->tag] >> 16) >> 16);
        pp->crqb[in_index].ctrl_flags = cpu_to_le16(flags);

        cw = &pp->crqb[in_index].ata_cmd[0];
        tf = &qc->tf;

        /* Sadly, the CRQB cannot accomodate all registers--there are
         * only 11 bytes...so we must pick and choose required
         * registers based on the command.  So, we drop feature and
         * hob_feature for [RW] DMA commands, but they are needed for
         * NCQ.  NCQ will drop hob_nsect, which is not needed there
         * (nsect is used only for the tag; feat/hob_feat hold true nsect).
         */
        switch (tf->command) {
        case ATA_CMD_READ:
        case ATA_CMD_READ_EXT:
        case ATA_CMD_WRITE:
        case ATA_CMD_WRITE_EXT:
        case ATA_CMD_WRITE_FUA_EXT:
                mv_crqb_pack_cmd(cw++, tf->hob_nsect, ATA_REG_NSECT, 0);
                break;
        case ATA_CMD_FPDMA_READ:
        case ATA_CMD_FPDMA_WRITE:
                mv_crqb_pack_cmd(cw++, tf->hob_feature, ATA_REG_FEATURE, 0);
                mv_crqb_pack_cmd(cw++, tf->feature, ATA_REG_FEATURE, 0);
                break;
        default:
                /* The only other commands EDMA supports in non-queued and
                 * non-NCQ mode are: [RW] STREAM DMA and W DMA FUA EXT, none
                 * of which are defined/used by Linux.  If we get here, this
                 * driver needs work.
                 *
                 * FIXME: modify libata to give qc_prep a return value and
                 * return error here.
                 */
                BUG_ON(tf->command);
                break;
        }
        mv_crqb_pack_cmd(cw++, tf->nsect, ATA_REG_NSECT, 0);
        mv_crqb_pack_cmd(cw++, tf->hob_lbal, ATA_REG_LBAL, 0);
        mv_crqb_pack_cmd(cw++, tf->lbal, ATA_REG_LBAL, 0);
        mv_crqb_pack_cmd(cw++, tf->hob_lbam, ATA_REG_LBAM, 0);
        mv_crqb_pack_cmd(cw++, tf->lbam, ATA_REG_LBAM, 0);
        mv_crqb_pack_cmd(cw++, tf->hob_lbah, ATA_REG_LBAH, 0);
        mv_crqb_pack_cmd(cw++, tf->lbah, ATA_REG_LBAH, 0);
        mv_crqb_pack_cmd(cw++, tf->device, ATA_REG_DEVICE, 0);
        mv_crqb_pack_cmd(cw++, tf->command, ATA_REG_CMD, 1);    /* last */

        if (!(qc->flags & ATA_QCFLAG_DMAMAP))
                return;
        mv_fill_sg(qc);
}

/**
 *      mv_qc_prep_iie - Host specific command preparation.
 *      @qc: queued command to prepare
 *
 *      This routine simply redirects to the general purpose routine
 *      if command is not DMA.  Else, it handles prep of the CRQB
 *      (command request block), does some sanity checking, and calls
 *      the SG load routine.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
{
        struct ata_port *ap = qc->ap;
        struct mv_port_priv *pp = ap->private_data;
        struct mv_crqb_iie *crqb;
        struct ata_taskfile *tf;
        unsigned in_index;
        u32 flags = 0;

        if ((qc->tf.protocol != ATA_PROT_DMA) &&
            (qc->tf.protocol != ATA_PROT_NCQ))
                return;

        /* Fill in Gen IIE command request block */
        if (!(qc->tf.flags & ATA_TFLAG_WRITE))
                flags |= CRQB_FLAG_READ;

        WARN_ON(MV_MAX_Q_DEPTH <= qc->tag);
        flags |= qc->tag << CRQB_TAG_SHIFT;
        flags |= qc->tag << CRQB_HOSTQ_SHIFT;
        flags |= (qc->dev->link->pmp & 0xf) << CRQB_PMP_SHIFT;

        /* get current queue index from software */
        in_index = pp->req_idx;

        crqb = (struct mv_crqb_iie *) &pp->crqb[in_index];
        crqb->addr = cpu_to_le32(pp->sg_tbl_dma[qc->tag] & 0xffffffff);
        crqb->addr_hi = cpu_to_le32((pp->sg_tbl_dma[qc->tag] >> 16) >> 16);
        crqb->flags = cpu_to_le32(flags);

        tf = &qc->tf;
        crqb->ata_cmd[0] = cpu_to_le32(
                        (tf->command << 16) |
                        (tf->feature << 24)
                );
        crqb->ata_cmd[1] = cpu_to_le32(
                        (tf->lbal << 0) |
                        (tf->lbam << 8) |
                        (tf->lbah << 16) |
                        (tf->device << 24)
                );
        crqb->ata_cmd[2] = cpu_to_le32(
                        (tf->hob_lbal << 0) |
                        (tf->hob_lbam << 8) |
                        (tf->hob_lbah << 16) |
                        (tf->hob_feature << 24)
                );
        crqb->ata_cmd[3] = cpu_to_le32(
                        (tf->nsect << 0) |
                        (tf->hob_nsect << 8)
                );

        if (!(qc->flags & ATA_QCFLAG_DMAMAP))
                return;
        mv_fill_sg(qc);
}

/**
 *      mv_qc_issue - Initiate a command to the host
 *      @qc: queued command to start
 *
 *      This routine simply redirects to the general purpose routine
 *      if command is not DMA.  Else, it sanity checks our local
 *      caches of the request producer/consumer indices then enables
 *      DMA and bumps the request producer index.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
{
        static int limit_warnings = 10;
        struct ata_port *ap = qc->ap;
        void __iomem *port_mmio = mv_ap_base(ap);
        struct mv_port_priv *pp = ap->private_data;
        u32 in_index;
        unsigned int port_irqs = DONE_IRQ | ERR_IRQ;

        switch (qc->tf.protocol) {
        case ATA_PROT_DMA:
        case ATA_PROT_NCQ:
                mv_start_edma(ap, port_mmio, pp, qc->tf.protocol);
                pp->req_idx = (pp->req_idx + 1) & MV_MAX_Q_DEPTH_MASK;
                in_index = pp->req_idx << EDMA_REQ_Q_PTR_SHIFT;

                /* Write the request in pointer to kick the EDMA to life */
                writelfl((pp->crqb_dma & EDMA_REQ_Q_BASE_LO_MASK) | in_index,
                                        port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
                return 0;

        case ATA_PROT_PIO:
                /*
                 * Errata SATA#16, SATA#24: warn if multiple DRQs expected.
                 *
                 * Someday, we might implement special polling workarounds
                 * for these, but it all seems rather unnecessary since we
                 * normally use only DMA for commands which transfer more
                 * than a single block of data.
                 *
                 * Much of the time, this could just work regardless.
                 * So for now, just log the incident, and allow the attempt.
                 */
                if (limit_warnings > 0 && (qc->nbytes / qc->sect_size) > 1) {
                        --limit_warnings;
                        ata_link_printk(qc->dev->link, KERN_WARNING, DRV_NAME
                                        ": attempting PIO w/multiple DRQ: "
                                        "this may fail due to h/w errata\n");
                }
                /* drop through */
        case ATAPI_PROT_PIO:
                port_irqs = ERR_IRQ;    /* leave DONE_IRQ masked for PIO */
                /* drop through */
        default:
                /*
                 * We're about to send a non-EDMA capable command to the
                 * port.  Turn off EDMA so there won't be problems accessing
                 * shadow block, etc registers.
                 */
                mv_stop_edma(ap);
                mv_clear_and_enable_port_irqs(ap, mv_ap_base(ap), port_irqs);
                mv_pmp_select(ap, qc->dev->link->pmp);
                return ata_sff_qc_issue(qc);
        }
}

static struct ata_queued_cmd *mv_get_active_qc(struct ata_port *ap)
{
        struct mv_port_priv *pp = ap->private_data;
        struct ata_queued_cmd *qc;

        if (pp->pp_flags & MV_PP_FLAG_NCQ_EN)
                return NULL;
        qc = ata_qc_from_tag(ap, ap->link.active_tag);
        if (qc) {
                if (qc->tf.flags & ATA_TFLAG_POLLING)
                        qc = NULL;
                else if (!(qc->flags & ATA_QCFLAG_ACTIVE))
                        qc = NULL;
        }
        return qc;
}

static void mv_pmp_error_handler(struct ata_port *ap)
{
        unsigned int pmp, pmp_map;
        struct mv_port_priv *pp = ap->private_data;

        if (pp->pp_flags & MV_PP_FLAG_DELAYED_EH) {
                /*
                 * Perform NCQ error analysis on failed PMPs
                 * before we freeze the port entirely.
                 *
                 * The failed PMPs are marked earlier by mv_pmp_eh_prep().
                 */
                pmp_map = pp->delayed_eh_pmp_map;
                pp->pp_flags &= ~MV_PP_FLAG_DELAYED_EH;
                for (pmp = 0; pmp_map != 0; pmp++) {
                        unsigned int this_pmp = (1 << pmp);
                        if (pmp_map & this_pmp) {
                                struct ata_link *link = &ap->pmp_link[pmp];
                                pmp_map &= ~this_pmp;
                                ata_eh_analyze_ncq_error(link);
                        }
                }
                ata_port_freeze(ap);
        }
        sata_pmp_error_handler(ap);
}

static unsigned int mv_get_err_pmp_map(struct ata_port *ap)
{
        void __iomem *port_mmio = mv_ap_base(ap);

        return readl(port_mmio + SATA_TESTCTL_OFS) >> 16;
}

static void mv_pmp_eh_prep(struct ata_port *ap, unsigned int pmp_map)
{
        struct ata_eh_info *ehi;
        unsigned int pmp;

        /*
         * Initialize EH info for PMPs which saw device errors
         */
        ehi = &ap->link.eh_info;
        for (pmp = 0; pmp_map != 0; pmp++) {
                unsigned int this_pmp = (1 << pmp);
                if (pmp_map & this_pmp) {
                        struct ata_link *link = &ap->pmp_link[pmp];

                        pmp_map &= ~this_pmp;
                        ehi = &link->eh_info;
                        ata_ehi_clear_desc(ehi);
                        ata_ehi_push_desc(ehi, "dev err");
                        ehi->err_mask |= AC_ERR_DEV;
                        ehi->action |= ATA_EH_RESET;
                        ata_link_abort(link);
                }
        }
}

static int mv_req_q_empty(struct ata_port *ap)
{
        void __iomem *port_mmio = mv_ap_base(ap);
        u32 in_ptr, out_ptr;

        in_ptr  = (readl(port_mmio + EDMA_REQ_Q_IN_PTR_OFS)
                        >> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK;
        out_ptr = (readl(port_mmio + EDMA_REQ_Q_OUT_PTR_OFS)
                        >> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK;
        return (in_ptr == out_ptr);     /* 1 == queue_is_empty */
}

static int mv_handle_fbs_ncq_dev_err(struct ata_port *ap)
{
        struct mv_port_priv *pp = ap->private_data;
        int failed_links;
        unsigned int old_map, new_map;

        /*
         * Device error during FBS+NCQ operation:
         *
         * Set a port flag to prevent further I/O being enqueued.
         * Leave the EDMA running to drain outstanding commands from this port.
         * Perform the post-mortem/EH only when all responses are complete.
         * Follow recovery sequence from 6042/7042 datasheet (7.3.15.4.2.2).
         */
        if (!(pp->pp_flags & MV_PP_FLAG_DELAYED_EH)) {
                pp->pp_flags |= MV_PP_FLAG_DELAYED_EH;
                pp->delayed_eh_pmp_map = 0;
        }
        old_map = pp->delayed_eh_pmp_map;
        new_map = old_map | mv_get_err_pmp_map(ap);

        if (old_map != new_map) {
                pp->delayed_eh_pmp_map = new_map;
                mv_pmp_eh_prep(ap, new_map & ~old_map);
        }
        failed_links = hweight16(new_map);

        ata_port_printk(ap, KERN_INFO, "%s: pmp_map=%04x qc_map=%04x "
                        "failed_links=%d nr_active_links=%d\n",
                        __func__, pp->delayed_eh_pmp_map,
                        ap->qc_active, failed_links,
                        ap->nr_active_links);

        if (ap->nr_active_links <= failed_links && mv_req_q_empty(ap)) {
                mv_process_crpb_entries(ap, pp);
                mv_stop_edma(ap);
                mv_eh_freeze(ap);
                ata_port_printk(ap, KERN_INFO, "%s: done\n", __func__);
                return 1;       /* handled */
        }
        ata_port_printk(ap, KERN_INFO, "%s: waiting\n", __func__);
        return 1;       /* handled */
}

static int mv_handle_fbs_non_ncq_dev_err(struct ata_port *ap)
{
        /*
         * Possible future enhancement:
         *
         * FBS+non-NCQ operation is not yet implemented.
         * See related notes in mv_edma_cfg().
         *
         * Device error during FBS+non-NCQ operation:
         *
         * We need to snapshot the shadow registers for each failed command.
         * Follow recovery sequence from 6042/7042 datasheet (7.3.15.4.2.3).
         */
        return 0;       /* not handled */
}

static int mv_handle_dev_err(struct ata_port *ap, u32 edma_err_cause)
{
        struct mv_port_priv *pp = ap->private_data;

        if (!(pp->pp_flags & MV_PP_FLAG_EDMA_EN))
                return 0;       /* EDMA was not active: not handled */
        if (!(pp->pp_flags & MV_PP_FLAG_FBS_EN))
                return 0;       /* FBS was not active: not handled */

        if (!(edma_err_cause & EDMA_ERR_DEV))
                return 0;       /* non DEV error: not handled */
        edma_err_cause &= ~EDMA_ERR_IRQ_TRANSIENT;
        if (edma_err_cause & ~(EDMA_ERR_DEV | EDMA_ERR_SELF_DIS))
                return 0;       /* other problems: not handled */

        if (pp->pp_flags & MV_PP_FLAG_NCQ_EN) {
                /*
                 * EDMA should NOT have self-disabled for this case.
                 * If it did, then something is wrong elsewhere,
                 * and we cannot handle it here.
                 */
                if (edma_err_cause & EDMA_ERR_SELF_DIS) {
                        ata_port_printk(ap, KERN_WARNING,
                                "%s: err_cause=0x%x pp_flags=0x%x\n",
                                __func__, edma_err_cause, pp->pp_flags);
                        return 0; /* not handled */
                }
                return mv_handle_fbs_ncq_dev_err(ap);
        } else {
                /*
                 * EDMA should have self-disabled for this case.
                 * If it did not, then something is wrong elsewhere,
                 * and we cannot handle it here.
                 */
                if (!(edma_err_cause & EDMA_ERR_SELF_DIS)) {
                        ata_port_printk(ap, KERN_WARNING,
                                "%s: err_cause=0x%x pp_flags=0x%x\n",
                                __func__, edma_err_cause, pp->pp_flags);
                        return 0; /* not handled */
                }
                return mv_handle_fbs_non_ncq_dev_err(ap);
        }
        return 0;       /* not handled */
}

static void mv_unexpected_intr(struct ata_port *ap, int edma_was_enabled)
{
        struct ata_eh_info *ehi = &ap->link.eh_info;
        char *when = "idle";

        ata_ehi_clear_desc(ehi);
        if (!ap || (ap->flags & ATA_FLAG_DISABLED)) {
                when = "disabled";
        } else if (edma_was_enabled) {
                when = "EDMA enabled";
        } else {
                struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->link.active_tag);
                if (qc && (qc->tf.flags & ATA_TFLAG_POLLING))
                        when = "polling";
        }
        ata_ehi_push_desc(ehi, "unexpected device interrupt while %s", when);
        ehi->err_mask |= AC_ERR_OTHER;
        ehi->action   |= ATA_EH_RESET;
        ata_port_freeze(ap);
}

/**
 *      mv_err_intr - Handle error interrupts on the port
 *      @ap: ATA channel to manipulate
 *
 *      Most cases require a full reset of the chip's state machine,
 *      which also performs a COMRESET.
 *      Also, if the port disabled DMA, update our cached copy to match.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_err_intr(struct ata_port *ap)
{
        void __iomem *port_mmio = mv_ap_base(ap);
        u32 edma_err_cause, eh_freeze_mask, serr = 0;
        u32 fis_cause = 0;
        struct mv_port_priv *pp = ap->private_data;
        struct mv_host_priv *hpriv = ap->host->private_data;
        unsigned int action = 0, err_mask = 0;
        struct ata_eh_info *ehi = &ap->link.eh_info;
        struct ata_queued_cmd *qc;
        int abort = 0;

        /*
         * Read and clear the SError and err_cause bits.
         * For GenIIe, if EDMA_ERR_TRANS_IRQ_7 is set, we also must read/clear
         * the FIS_IRQ_CAUSE register before clearing edma_err_cause.
         */
        sata_scr_read(&ap->link, SCR_ERROR, &serr);
        sata_scr_write_flush(&ap->link, SCR_ERROR, serr);

        edma_err_cause = readl(port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
        if (IS_GEN_IIE(hpriv) && (edma_err_cause & EDMA_ERR_TRANS_IRQ_7)) {
                fis_cause = readl(port_mmio + SATA_FIS_IRQ_CAUSE_OFS);
                writelfl(~fis_cause, port_mmio + SATA_FIS_IRQ_CAUSE_OFS);
        }
        writelfl(~edma_err_cause, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);

        if (edma_err_cause & EDMA_ERR_DEV) {
                /*
                 * Device errors during FIS-based switching operation
                 * require special handling.
                 */
                if (mv_handle_dev_err(ap, edma_err_cause))
                        return;
        }

        qc = mv_get_active_qc(ap);
        ata_ehi_clear_desc(ehi);
        ata_ehi_push_desc(ehi, "edma_err_cause=%08x pp_flags=%08x",
                          edma_err_cause, pp->pp_flags);

        if (IS_GEN_IIE(hpriv) && (edma_err_cause & EDMA_ERR_TRANS_IRQ_7)) {
                ata_ehi_push_desc(ehi, "fis_cause=%08x", fis_cause);
                if (fis_cause & SATA_FIS_IRQ_AN) {
                        u32 ec = edma_err_cause &
                               ~(EDMA_ERR_TRANS_IRQ_7 | EDMA_ERR_IRQ_TRANSIENT);
                        sata_async_notification(ap);
                        if (!ec)
                                return; /* Just an AN; no need for the nukes */
                        ata_ehi_push_desc(ehi, "SDB notify");
                }
        }
        /*
         * All generations share these EDMA error cause bits:
         */
        if (edma_err_cause & EDMA_ERR_DEV) {
                err_mask |= AC_ERR_DEV;
                action |= ATA_EH_RESET;
                ata_ehi_push_desc(ehi, "dev error");
        }
        if (edma_err_cause & (EDMA_ERR_D_PAR | EDMA_ERR_PRD_PAR |
                        EDMA_ERR_CRQB_PAR | EDMA_ERR_CRPB_PAR |
                        EDMA_ERR_INTRL_PAR)) {
                err_mask |= AC_ERR_ATA_BUS;
                action |= ATA_EH_RESET;
                ata_ehi_push_desc(ehi, "parity error");
        }
        if (edma_err_cause & (EDMA_ERR_DEV_DCON | EDMA_ERR_DEV_CON)) {
                ata_ehi_hotplugged(ehi);
                ata_ehi_push_desc(ehi, edma_err_cause & EDMA_ERR_DEV_DCON ?
                        "dev disconnect" : "dev connect");
                action |= ATA_EH_RESET;
        }

        /*
         * Gen-I has a different SELF_DIS bit,
         * different FREEZE bits, and no SERR bit:
         */
        if (IS_GEN_I(hpriv)) {
                eh_freeze_mask = EDMA_EH_FREEZE_5;
                if (edma_err_cause & EDMA_ERR_SELF_DIS_5) {
                        pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
                        ata_ehi_push_desc(ehi, "EDMA self-disable");
                }
        } else {
                eh_freeze_mask = EDMA_EH_FREEZE;
                if (edma_err_cause & EDMA_ERR_SELF_DIS) {
                        pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
                        ata_ehi_push_desc(ehi, "EDMA self-disable");
                }
                if (edma_err_cause & EDMA_ERR_SERR) {
                        ata_ehi_push_desc(ehi, "SError=%08x", serr);
                        err_mask |= AC_ERR_ATA_BUS;
                        action |= ATA_EH_RESET;
                }
        }

        if (!err_mask) {
                err_mask = AC_ERR_OTHER;
                action |= ATA_EH_RESET;
        }

        ehi->serror |= serr;
        ehi->action |= action;

        if (qc)
                qc->err_mask |= err_mask;
        else
                ehi->err_mask |= err_mask;

        if (err_mask == AC_ERR_DEV) {
                /*
                 * Cannot do ata_port_freeze() here,
                 * because it would kill PIO access,
                 * which is needed for further diagnosis.
                 */
                mv_eh_freeze(ap);
                abort = 1;
        } else if (edma_err_cause & eh_freeze_mask) {
                /*
                 * Note to self: ata_port_freeze() calls ata_port_abort()
                 */
                ata_port_freeze(ap);
        } else {
                abort = 1;
        }

        if (abort) {
                if (qc)
                        ata_link_abort(qc->dev->link);
                else
                        ata_port_abort(ap);
        }
}

static void mv_process_crpb_response(struct ata_port *ap,
                struct mv_crpb *response, unsigned int tag, int ncq_enabled)
{
        struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);

        if (qc) {
                u8 ata_status;
                u16 edma_status = le16_to_cpu(response->flags);
                /*
                 * edma_status from a response queue entry:
                 *   LSB is from EDMA_ERR_IRQ_CAUSE_OFS (non-NCQ only).
                 *   MSB is saved ATA status from command completion.
                 */
                if (!ncq_enabled) {
                        u8 err_cause = edma_status & 0xff & ~EDMA_ERR_DEV;
                        if (err_cause) {
                                /*
                                 * Error will be seen/handled by mv_err_intr().
                                 * So do nothing at all here.
                                 */
                                return;
                        }
                }
                ata_status = edma_status >> CRPB_FLAG_STATUS_SHIFT;
                if (!ac_err_mask(ata_status))
                        ata_qc_complete(qc);
                /* else: leave it for mv_err_intr() */
        } else {
                ata_port_printk(ap, KERN_ERR, "%s: no qc for tag=%d\n",
                                __func__, tag);
        }
}

static void mv_process_crpb_entries(struct ata_port *ap, struct mv_port_priv *pp)
{
        void __iomem *port_mmio = mv_ap_base(ap);
        struct mv_host_priv *hpriv = ap->host->private_data;
        u32 in_index;
        bool work_done = false;
        int ncq_enabled = (pp->pp_flags & MV_PP_FLAG_NCQ_EN);

        /* Get the hardware queue position index */
        in_index = (readl(port_mmio + EDMA_RSP_Q_IN_PTR_OFS)
                        >> EDMA_RSP_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK;

        /* Process new responses from since the last time we looked */
        while (in_index != pp->resp_idx) {
                unsigned int tag;
                struct mv_crpb *response = &pp->crpb[pp->resp_idx];

                pp->resp_idx = (pp->resp_idx + 1) & MV_MAX_Q_DEPTH_MASK;

                if (IS_GEN_I(hpriv)) {
                        /* 50xx: no NCQ, only one command active at a time */
                        tag = ap->link.active_tag;
                } else {
                        /* Gen II/IIE: get command tag from CRPB entry */
                        tag = le16_to_cpu(response->id) & 0x1f;
                }
                mv_process_crpb_response(ap, response, tag, ncq_enabled);
                work_done = true;
        }

        /* Update the software queue position index in hardware */
        if (work_done)
                writelfl((pp->crpb_dma & EDMA_RSP_Q_BASE_LO_MASK) |
                         (pp->resp_idx << EDMA_RSP_Q_PTR_SHIFT),
                         port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
}

static void mv_port_intr(struct ata_port *ap, u32 port_cause)
{
        struct mv_port_priv *pp;
        int edma_was_enabled;

        if (!ap || (ap->flags & ATA_FLAG_DISABLED)) {
                mv_unexpected_intr(ap, 0);
                return;
        }
        /*
         * Grab a snapshot of the EDMA_EN flag setting,
         * so that we have a consistent view for this port,
         * even if something we call of our routines changes it.
         */
        pp = ap->private_data;
        edma_was_enabled = (pp->pp_flags & MV_PP_FLAG_EDMA_EN);
        /*
         * Process completed CRPB response(s) before other events.
         */
        if (edma_was_enabled && (port_cause & DONE_IRQ)) {
                mv_process_crpb_entries(ap, pp);
                if (pp->pp_flags & MV_PP_FLAG_DELAYED_EH)
                        mv_handle_fbs_ncq_dev_err(ap);
        }
        /*
         * Handle chip-reported errors, or continue on to handle PIO.
         */
        if (unlikely(port_cause & ERR_IRQ)) {
                mv_err_intr(ap);
        } else if (!edma_was_enabled) {
                struct ata_queued_cmd *qc = mv_get_active_qc(ap);
                if (qc)
                        ata_sff_host_intr(ap, qc);
                else
                        mv_unexpected_intr(ap, edma_was_enabled);
        }
}

/**
 *      mv_host_intr - Handle all interrupts on the given host controller
 *      @host: host specific structure
 *      @main_irq_cause: Main interrupt cause register for the chip.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static int mv_host_intr(struct ata_host *host, u32 main_irq_cause)
{
        struct mv_host_priv *hpriv = host->private_data;
        void __iomem *mmio = hpriv->base, *hc_mmio;
        unsigned int handled = 0, port;

        for (port = 0; port < hpriv->n_ports; port++) {
                struct ata_port *ap = host->ports[port];
                unsigned int p, shift, hardport, port_cause;

                MV_PORT_TO_SHIFT_AND_HARDPORT(port, shift, hardport);
                /*
                 * Each hc within the host has its own hc_irq_cause register,
                 * where the interrupting ports bits get ack'd.
                 */
                if (hardport == 0) {    /* first port on this hc ? */
                        u32 hc_cause = (main_irq_cause >> shift) & HC0_IRQ_PEND;
                        u32 port_mask, ack_irqs;
                        /*
                         * Skip this entire hc if nothing pending for any ports
                         */
                        if (!hc_cause) {
                                port += MV_PORTS_PER_HC - 1;
                                continue;
                        }
                        /*
                         * We don't need/want to read the hc_irq_cause register,
                         * because doing so hurts performance, and
                         * main_irq_cause already gives us everything we need.
                         *
                         * But we do have to *write* to the hc_irq_cause to ack
                         * the ports that we are handling this time through.
                         *
                         * This requires that we create a bitmap for those
                         * ports which interrupted us, and use that bitmap
                         * to ack (only) those ports via hc_irq_cause.
                         */
                        ack_irqs = 0;
                        for (p = 0; p < MV_PORTS_PER_HC; ++p) {
                                if ((port + p) >= hpriv->n_ports)
                                        break;
                                port_mask = (DONE_IRQ | ERR_IRQ) << (p * 2);
                                if (hc_cause & port_mask)
                                        ack_irqs |= (DMA_IRQ | DEV_IRQ) << p;
                        }
                        hc_mmio = mv_hc_base_from_port(mmio, port);
                        writelfl(~ack_irqs, hc_mmio + HC_IRQ_CAUSE_OFS);
                        handled = 1;
                }
                /*
                 * Handle interrupts signalled for this port:
                 */
                port_cause = (main_irq_cause >> shift) & (DONE_IRQ | ERR_IRQ);
                if (port_cause)
                        mv_port_intr(ap, port_cause);
        }
        return handled;
}

static int mv_pci_error(struct ata_host *host, void __iomem *mmio)
{
        struct mv_host_priv *hpriv = host->private_data;
        struct ata_port *ap;
        struct ata_queued_cmd *qc;
        struct ata_eh_info *ehi;
        unsigned int i, err_mask, printed = 0;
        u32 err_cause;

        err_cause = readl(mmio + hpriv->irq_cause_ofs);

        dev_printk(KERN_ERR, host->dev, "PCI ERROR; PCI IRQ cause=0x%08x\n",
                   err_cause);

        DPRINTK("All regs @ PCI error\n");
        mv_dump_all_regs(mmio, -1, to_pci_dev(host->dev));

        writelfl(0, mmio + hpriv->irq_cause_ofs);

        for (i = 0; i < host->n_ports; i++) {
                ap = host->ports[i];
                if (!ata_link_offline(&ap->link)) {
                        ehi = &ap->link.eh_info;
                        ata_ehi_clear_desc(ehi);
                        if (!printed++)
                                ata_ehi_push_desc(ehi,
                                        "PCI err cause 0x%08x", err_cause);
                        err_mask = AC_ERR_HOST_BUS;
                        ehi->action = ATA_EH_RESET;
                        qc = ata_qc_from_tag(ap, ap->link.active_tag);
                        if (qc)
                                qc->err_mask |= err_mask;
                        else
                                ehi->err_mask |= err_mask;

                        ata_port_freeze(ap);
                }
        }
        return 1;       /* handled */
}

/**
 *      mv_interrupt - Main interrupt event handler
 *      @irq: unused
 *      @dev_instance: private data; in this case the host structure
 *
 *      Read the read only register to determine if any host
 *      controllers have pending interrupts.  If so, call lower level
 *      routine to handle.  Also check for PCI errors which are only
 *      reported here.
 *
 *      LOCKING:
 *      This routine holds the host lock while processing pending
 *      interrupts.
 */
static irqreturn_t mv_interrupt(int irq, void *dev_instance)
{
        struct ata_host *host = dev_instance;
        struct mv_host_priv *hpriv = host->private_data;
        unsigned int handled = 0;
        int using_msi = hpriv->hp_flags & MV_HP_FLAG_MSI;
        u32 main_irq_cause, pending_irqs;

        spin_lock(&host->lock);

        /* for MSI:  block new interrupts while in here */
        if (using_msi)
                writel(0, hpriv->main_irq_mask_addr);

        main_irq_cause = readl(hpriv->main_irq_cause_addr);
        pending_irqs   = main_irq_cause & hpriv->main_irq_mask;
        /*
         * Deal with cases where we either have nothing pending, or have read
         * a bogus register value which can indicate HW removal or PCI fault.
         */
        if (pending_irqs && main_irq_cause != 0xffffffffU) {
                if (unlikely((pending_irqs & PCI_ERR) && !IS_SOC(hpriv)))
                        handled = mv_pci_error(host, hpriv->base);
                else
                        handled = mv_host_intr(host, pending_irqs);
        }

        /* for MSI: unmask; interrupt cause bits will retrigger now */
        if (using_msi)
                writel(hpriv->main_irq_mask, hpriv->main_irq_mask_addr);

        spin_unlock(&host->lock);

        return IRQ_RETVAL(handled);
}

static unsigned int mv5_scr_offset(unsigned int sc_reg_in)
{
        unsigned int ofs;

        switch (sc_reg_in) {
        case SCR_STATUS:
        case SCR_ERROR:
        case SCR_CONTROL:
                ofs = sc_reg_in * sizeof(u32);
                break;
        default:
                ofs = 0xffffffffU;
                break;
        }
        return ofs;
}

static int mv5_scr_read(struct ata_link *link, unsigned int sc_reg_in, u32 *val)
{
        struct mv_host_priv *hpriv = link->ap->host->private_data;
        void __iomem *mmio = hpriv->base;
        void __iomem *addr = mv5_phy_base(mmio, link->ap->port_no);
        unsigned int ofs = mv5_scr_offset(sc_reg_in);

        if (ofs != 0xffffffffU) {
                *val = readl(addr + ofs);
                return 0;
        } else
                return -EINVAL;
}

static int mv5_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val)
{
        struct mv_host_priv *hpriv = link->ap->host->private_data;
        void __iomem *mmio = hpriv->base;
        void __iomem *addr = mv5_phy_base(mmio, link->ap->port_no);
        unsigned int ofs = mv5_scr_offset(sc_reg_in);

        if (ofs != 0xffffffffU) {
                writelfl(val, addr + ofs);
                return 0;
        } else
                return -EINVAL;
}

static void mv5_reset_bus(struct ata_host *host, void __iomem *mmio)
{
        struct pci_dev *pdev = to_pci_dev(host->dev);
        int early_5080;

        early_5080 = (pdev->device == 0x5080) && (pdev->revision == 0);

        if (!early_5080) {
                u32 tmp = readl(mmio + MV_PCI_EXP_ROM_BAR_CTL);
                tmp |= (1 << 0);
                writel(tmp, mmio + MV_PCI_EXP_ROM_BAR_CTL);
        }

        mv_reset_pci_bus(host, mmio);
}

static void mv5_reset_flash(struct mv_host_priv *hpriv, void __iomem *mmio)
{
        writel(0x0fcfffff, mmio + MV_FLASH_CTL_OFS);
}

static void mv5_read_preamp(struct mv_host_priv *hpriv, int idx,
                           void __iomem *mmio)
{
        void __iomem *phy_mmio = mv5_phy_base(mmio, idx);
        u32 tmp;

        tmp = readl(phy_mmio + MV5_PHY_MODE);

        hpriv->signal[idx].pre = tmp & 0x1800;  /* bits 12:11 */
        hpriv->signal[idx].amps = tmp & 0xe0;   /* bits 7:5 */
}

static void mv5_enable_leds(struct mv_host_priv *hpriv, void __iomem *mmio)
{
        u32 tmp;

        writel(0, mmio + MV_GPIO_PORT_CTL_OFS);

        /* FIXME: handle MV_HP_ERRATA_50XXB2 errata */

        tmp = readl(mmio + MV_PCI_EXP_ROM_BAR_CTL);
        tmp |= ~(1 << 0);
        writel(tmp, mmio + MV_PCI_EXP_ROM_BAR_CTL);
}

static void mv5_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
                           unsigned int port)
{
        void __iomem *phy_mmio = mv5_phy_base(mmio, port);
        const u32 mask = (1<<12) | (1<<11) | (1<<7) | (1<<6) | (1<<5);
        u32 tmp;
        int fix_apm_sq = (hpriv->hp_flags & MV_HP_ERRATA_50XXB0);

        if (fix_apm_sq) {
                tmp = readl(phy_mmio + MV5_LTMODE_OFS);
                tmp |= (1 << 19);
                writel(tmp, phy_mmio + MV5_LTMODE_OFS);

                tmp = readl(phy_mmio + MV5_PHY_CTL_OFS);
                tmp &= ~0x3;
                tmp |= 0x1;
                writel(tmp, phy_mmio + MV5_PHY_CTL_OFS);
        }

        tmp = readl(phy_mmio + MV5_PHY_MODE);
        tmp &= ~mask;
        tmp |= hpriv->signal[port].pre;
        tmp |= hpriv->signal[port].amps;
        writel(tmp, phy_mmio + MV5_PHY_MODE);
}


#undef ZERO
#define ZERO(reg) writel(0, port_mmio + (reg))
static void mv5_reset_hc_port(struct mv_host_priv *hpriv, void __iomem *mmio,
                             unsigned int port)
{
        void __iomem *port_mmio = mv_port_base(mmio, port);

        mv_reset_channel(hpriv, mmio, port);

        ZERO(0x028);    /* command */
        writel(0x11f, port_mmio + EDMA_CFG_OFS);
        ZERO(0x004);    /* timer */
        ZERO(0x008);    /* irq err cause */
        ZERO(0x00c);    /* irq err mask */
        ZERO(0x010);    /* rq bah */
        ZERO(0x014);    /* rq inp */
        ZERO(0x018);    /* rq outp */
        ZERO(0x01c);    /* respq bah */
        ZERO(0x024);    /* respq outp */
        ZERO(0x020);    /* respq inp */
        ZERO(0x02c);    /* test control */
        writel(0xbc, port_mmio + EDMA_IORDY_TMOUT_OFS);
}
#undef ZERO

#define ZERO(reg) writel(0, hc_mmio + (reg))
static void mv5_reset_one_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
                        unsigned int hc)
{
        void __iomem *hc_mmio = mv_hc_base(mmio, hc);
        u32 tmp;

        ZERO(0x00c);
        ZERO(0x010);
        ZERO(0x014);
        ZERO(0x018);

        tmp = readl(hc_mmio + 0x20);
        tmp &= 0x1c1c1c1c;
        tmp |= 0x03030303;
        writel(tmp, hc_mmio + 0x20);
}
#undef ZERO

static int mv5_reset_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
                        unsigned int n_hc)
{
        unsigned int hc, port;

        for (hc = 0; hc < n_hc; hc++) {
                for (port = 0; port < MV_PORTS_PER_HC; port++)
                        mv5_reset_hc_port(hpriv, mmio,
                                          (hc * MV_PORTS_PER_HC) + port);

                mv5_reset_one_hc(hpriv, mmio, hc);
        }

        return 0;
}

#undef ZERO
#define ZERO(reg) writel(0, mmio + (reg))
static void mv_reset_pci_bus(struct ata_host *host, void __iomem *mmio)
{
        struct mv_host_priv *hpriv = host->private_data;
        u32 tmp;

        tmp = readl(mmio + MV_PCI_MODE_OFS);
        tmp &= 0xff00ffff;
        writel(tmp, mmio + MV_PCI_MODE_OFS);

        ZERO(MV_PCI_DISC_TIMER);
        ZERO(MV_PCI_MSI_TRIGGER);
        writel(0x000100ff, mmio + MV_PCI_XBAR_TMOUT_OFS);
        ZERO(MV_PCI_SERR_MASK);
        ZERO(hpriv->irq_cause_ofs);
        ZERO(hpriv->irq_mask_ofs);
        ZERO(MV_PCI_ERR_LOW_ADDRESS);
        ZERO(MV_PCI_ERR_HIGH_ADDRESS);
        ZERO(MV_PCI_ERR_ATTRIBUTE);
        ZERO(MV_PCI_ERR_COMMAND);
}
#undef ZERO

static void mv6_reset_flash(struct mv_host_priv *hpriv, void __iomem *mmio)
{
        u32 tmp;

        mv5_reset_flash(hpriv, mmio);

        tmp = readl(mmio + MV_GPIO_PORT_CTL_OFS);
        tmp &= 0x3;
        tmp |= (1 << 5) | (1 << 6);
        writel(tmp, mmio + MV_GPIO_PORT_CTL_OFS);
}

/**
 *      mv6_reset_hc - Perform the 6xxx global soft reset
 *      @mmio: base address of the HBA
 *
 *      This routine only applies to 6xxx parts.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static int mv6_reset_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
                        unsigned int n_hc)
{
        void __iomem *reg = mmio + PCI_MAIN_CMD_STS_OFS;
        int i, rc = 0;
        u32 t;

        /* Following procedure defined in PCI "main command and status
         * register" table.
         */
        t = readl(reg);
        writel(t | STOP_PCI_MASTER, reg);

        for (i = 0; i < 1000; i++) {
                udelay(1);
                t = readl(reg);
                if (PCI_MASTER_EMPTY & t)
                        break;
        }
        if (!(PCI_MASTER_EMPTY & t)) {
                printk(KERN_ERR DRV_NAME ": PCI master won't flush\n");
                rc = 1;
                goto done;
        }

        /* set reset */
        i = 5;
        do {
                writel(t | GLOB_SFT_RST, reg);
                t = readl(reg);
                udelay(1);
        } while (!(GLOB_SFT_RST & t) && (i-- > 0));

        if (!(GLOB_SFT_RST & t)) {
                printk(KERN_ERR DRV_NAME ": can't set global reset\n");
                rc = 1;
                goto done;
        }

        /* clear reset and *reenable the PCI master* (not mentioned in spec) */
        i = 5;
        do {
                writel(t & ~(GLOB_SFT_RST | STOP_PCI_MASTER), reg);
                t = readl(reg);
                udelay(1);
        } while ((GLOB_SFT_RST & t) && (i-- > 0));

        if (GLOB_SFT_RST & t) {
                printk(KERN_ERR DRV_NAME ": can't clear global reset\n");
                rc = 1;
        }
done:
        return rc;
}

static void mv6_read_preamp(struct mv_host_priv *hpriv, int idx,
                           void __iomem *mmio)
{
        void __iomem *port_mmio;
        u32 tmp;

        tmp = readl(mmio + MV_RESET_CFG_OFS);
        if ((tmp & (1 << 0)) == 0) {
                hpriv->signal[idx].amps = 0x7 << 8;
                hpriv->signal[idx].pre = 0x1 << 5;
                return;
        }

        port_mmio = mv_port_base(mmio, idx);
        tmp = readl(port_mmio + PHY_MODE2);

        hpriv->signal[idx].amps = tmp & 0x700;  /* bits 10:8 */
        hpriv->signal[idx].pre = tmp & 0xe0;    /* bits 7:5 */
}

static void mv6_enable_leds(struct mv_host_priv *hpriv, void __iomem *mmio)
{
        writel(0x00000060, mmio + MV_GPIO_PORT_CTL_OFS);
}

static void mv6_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
                           unsigned int port)
{
        void __iomem *port_mmio = mv_port_base(mmio, port);

        u32 hp_flags = hpriv->hp_flags;
        int fix_phy_mode2 =
                hp_flags & (MV_HP_ERRATA_60X1B2 | MV_HP_ERRATA_60X1C0);
        int fix_phy_mode4 =
                hp_flags & (MV_HP_ERRATA_60X1B2 | MV_HP_ERRATA_60X1C0);
        u32 m2, m3;

        if (fix_phy_mode2) {
                m2 = readl(port_mmio + PHY_MODE2);
                m2 &= ~(1 << 16);
                m2 |= (1 << 31);
                writel(m2, port_mmio + PHY_MODE2);

                udelay(200);

                m2 = readl(port_mmio + PHY_MODE2);
                m2 &= ~((1 << 16) | (1 << 31));
                writel(m2, port_mmio + PHY_MODE2);

                udelay(200);
        }

        /*
         * Gen-II/IIe PHY_MODE3 errata RM#2:
         * Achieves better receiver noise performance than the h/w default:
         */
        m3 = readl(port_mmio + PHY_MODE3);
        m3 = (m3 & 0x1f) | (0x5555601 << 5);

        /* Guideline 88F5182 (GL# SATA-S11) */
        if (IS_SOC(hpriv))
                m3 &= ~0x1c;

        if (fix_phy_mode4) {
                u32 m4 = readl(port_mmio + PHY_MODE4);
                /*
                 * Enforce reserved-bit restrictions on GenIIe devices only.
                 * For earlier chipsets, force only the internal config field
                 *  (workaround for errata FEr SATA#10 part 1).
                 */
                if (IS_GEN_IIE(hpriv))
                        m4 = (m4 & ~PHY_MODE4_RSVD_ZEROS) | PHY_MODE4_RSVD_ONES;
                else
                        m4 = (m4 & ~PHY_MODE4_CFG_MASK) | PHY_MODE4_CFG_VALUE;
                writel(m4, port_mmio + PHY_MODE4);
        }
        /*
         * Workaround for 60x1-B2 errata SATA#13:
         * Any write to PHY_MODE4 (above) may corrupt PHY_MODE3,
         * so we must always rewrite PHY_MODE3 after PHY_MODE4.
         */
        writel(m3, port_mmio + PHY_MODE3);

        /* Revert values of pre-emphasis and signal amps to the saved ones */
        m2 = readl(port_mmio + PHY_MODE2);

        m2 &= ~MV_M2_PREAMP_MASK;
        m2 |= hpriv->signal[port].amps;
        m2 |= hpriv->signal[port].pre;
        m2 &= ~(1 << 16);

        /* according to mvSata 3.6.1, some IIE values are fixed */
        if (IS_GEN_IIE(hpriv)) {
                m2 &= ~0xC30FF01F;
                m2 |= 0x0000900F;
        }

        writel(m2, port_mmio + PHY_MODE2);
}

/* TODO: use the generic LED interface to configure the SATA Presence */
/* & Acitivy LEDs on the board */
static void mv_soc_enable_leds(struct mv_host_priv *hpriv,
                                      void __iomem *mmio)
{
        return;
}

static void mv_soc_read_preamp(struct mv_host_priv *hpriv, int idx,
                           void __iomem *mmio)
{
        void __iomem *port_mmio;
        u32 tmp;

        port_mmio = mv_port_base(mmio, idx);
        tmp = readl(port_mmio + PHY_MODE2);

        hpriv->signal[idx].amps = tmp & 0x700;  /* bits 10:8 */
        hpriv->signal[idx].pre = tmp & 0xe0;    /* bits 7:5 */
}

#undef ZERO
#define ZERO(reg) writel(0, port_mmio + (reg))
static void mv_soc_reset_hc_port(struct mv_host_priv *hpriv,
                                        void __iomem *mmio, unsigned int port)
{
        void __iomem *port_mmio = mv_port_base(mmio, port);

        mv_reset_channel(hpriv, mmio, port);

        ZERO(0x028);            /* command */
        writel(0x101f, port_mmio + EDMA_CFG_OFS);
        ZERO(0x004);            /* timer */
        ZERO(0x008);            /* irq err cause */
        ZERO(0x00c);            /* irq err mask */
        ZERO(0x010);            /* rq bah */
        ZERO(0x014);            /* rq inp */
        ZERO(0x018);            /* rq outp */
        ZERO(0x01c);            /* respq bah */
        ZERO(0x024);            /* respq outp */
        ZERO(0x020);            /* respq inp */
        ZERO(0x02c);            /* test control */
        writel(0xbc, port_mmio + EDMA_IORDY_TMOUT_OFS);
}

#undef ZERO

#define ZERO(reg) writel(0, hc_mmio + (reg))
static void mv_soc_reset_one_hc(struct mv_host_priv *hpriv,
                                       void __iomem *mmio)
{
        void __iomem *hc_mmio = mv_hc_base(mmio, 0);

        ZERO(0x00c);
        ZERO(0x010);
        ZERO(0x014);

}

#undef ZERO

static int mv_soc_reset_hc(struct mv_host_priv *hpriv,
                                  void __iomem *mmio, unsigned int n_hc)
{
        unsigned int port;

        for (port = 0; port < hpriv->n_ports; port++)
                mv_soc_reset_hc_port(hpriv, mmio, port);

        mv_soc_reset_one_hc(hpriv, mmio);

        return 0;
}

static void mv_soc_reset_flash(struct mv_host_priv *hpriv,
                                      void __iomem *mmio)
{
        return;
}

static void mv_soc_reset_bus(struct ata_host *host, void __iomem *mmio)
{
        return;
}

static void mv_setup_ifcfg(void __iomem *port_mmio, int want_gen2i)
{
        u32 ifcfg = readl(port_mmio + SATA_INTERFACE_CFG_OFS);

        ifcfg = (ifcfg & 0xf7f) | 0x9b1000;     /* from chip spec */
        if (want_gen2i)
                ifcfg |= (1 << 7);              /* enable gen2i speed */
        writelfl(ifcfg, port_mmio + SATA_INTERFACE_CFG_OFS);
}

static void mv_reset_channel(struct mv_host_priv *hpriv, void __iomem *mmio,
                             unsigned int port_no)
{
        void __iomem *port_mmio = mv_port_base(mmio, port_no);

        /*
         * The datasheet warns against setting EDMA_RESET when EDMA is active
         * (but doesn't say what the problem might be).  So we first try
         * to disable the EDMA engine before doing the EDMA_RESET operation.
         */
        mv_stop_edma_engine(port_mmio);
        writelfl(EDMA_RESET, port_mmio + EDMA_CMD_OFS);

        if (!IS_GEN_I(hpriv)) {
                /* Enable 3.0gb/s link speed: this survives EDMA_RESET */
                mv_setup_ifcfg(port_mmio, 1);
        }
        /*
         * Strobing EDMA_RESET here causes a hard reset of the SATA transport,
         * link, and physical layers.  It resets all SATA interface registers
         * (except for SATA_INTERFACE_CFG), and issues a COMRESET to the dev.
         */
        writelfl(EDMA_RESET, port_mmio + EDMA_CMD_OFS);
        udelay(25);     /* allow reset propagation */
        writelfl(0, port_mmio + EDMA_CMD_OFS);

        hpriv->ops->phy_errata(hpriv, mmio, port_no);

        if (IS_GEN_I(hpriv))
                mdelay(1);
}

static void mv_pmp_select(struct ata_port *ap, int pmp)
{
        if (sata_pmp_supported(ap)) {
                void __iomem *port_mmio = mv_ap_base(ap);
                u32 reg = readl(port_mmio + SATA_IFCTL_OFS);
                int old = reg & 0xf;

                if (old != pmp) {
                        reg = (reg & ~0xf) | pmp;
                        writelfl(reg, port_mmio + SATA_IFCTL_OFS);
                }
        }
}

static int mv_pmp_hardreset(struct ata_link *link, unsigned int *class,
                                unsigned long deadline)
{
        mv_pmp_select(link->ap, sata_srst_pmp(link));
        return sata_std_hardreset(link, class, deadline);
}

static int mv_softreset(struct ata_link *link, unsigned int *class,
                                unsigned long deadline)
{
        mv_pmp_select(link->ap, sata_srst_pmp(link));
        return ata_sff_softreset(link, class, deadline);
}

static int mv_hardreset(struct ata_link *link, unsigned int *class,
                        unsigned long deadline)
{
        struct ata_port *ap = link->ap;
        struct mv_host_priv *hpriv = ap->host->private_data;
        struct mv_port_priv *pp = ap->private_data;
        void __iomem *mmio = hpriv->base;
        int rc, attempts = 0, extra = 0;
        u32 sstatus;
        bool online;

        mv_reset_channel(hpriv, mmio, ap->port_no);
        pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;

        /* Workaround for errata FEr SATA#10 (part 2) */
        do {
                const unsigned long *timing =
                                sata_ehc_deb_timing(&link->eh_context);

                rc = sata_link_hardreset(link, timing, deadline + extra,
                                         &online, NULL);
                rc = online ? -EAGAIN : rc;
                if (rc)
                        return rc;
                sata_scr_read(link, SCR_STATUS, &sstatus);
                if (!IS_GEN_I(hpriv) && ++attempts >= 5 && sstatus == 0x121) {
                        /* Force 1.5gb/s link speed and try again */
                        mv_setup_ifcfg(mv_ap_base(ap), 0);
                        if (time_after(jiffies + HZ, deadline))
                                extra = HZ; /* only extend it once, max */
                }
        } while (sstatus != 0x0 && sstatus != 0x113 && sstatus != 0x123);
        mv_edma_cfg(ap, 0, 0);

        return rc;
}

static void mv_eh_freeze(struct ata_port *ap)
{
        mv_stop_edma(ap);
        mv_enable_port_irqs(ap, 0);
}

static void mv_eh_thaw(struct ata_port *ap)
{
        struct mv_host_priv *hpriv = ap->host->private_data;
        unsigned int port = ap->port_no;
        unsigned int hardport = mv_hardport_from_port(port);
        void __iomem *hc_mmio = mv_hc_base_from_port(hpriv->base, port);
        void __iomem *port_mmio = mv_ap_base(ap);
        u32 hc_irq_cause;

        /* clear EDMA errors on this port */
        writel(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);

        /* clear pending irq events */
        hc_irq_cause = ~((DEV_IRQ | DMA_IRQ) << hardport);
        writelfl(hc_irq_cause, hc_mmio + HC_IRQ_CAUSE_OFS);

        mv_enable_port_irqs(ap, ERR_IRQ);
}

/**
 *      mv_port_init - Perform some early initialization on a single port.
 *      @port: libata data structure storing shadow register addresses
 *      @port_mmio: base address of the port
 *
 *      Initialize shadow register mmio addresses, clear outstanding
 *      interrupts on the port, and unmask interrupts for the future
 *      start of the port.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_port_init(struct ata_ioports *port,  void __iomem *port_mmio)
{
        void __iomem *shd_base = port_mmio + SHD_BLK_OFS;
        unsigned serr_ofs;

        /* PIO related setup
         */
        port->data_addr = shd_base + (sizeof(u32) * ATA_REG_DATA);
        port->error_addr =
                port->feature_addr = shd_base + (sizeof(u32) * ATA_REG_ERR);
        port->nsect_addr = shd_base + (sizeof(u32) * ATA_REG_NSECT);
        port->lbal_addr = shd_base + (sizeof(u32) * ATA_REG_LBAL);
        port->lbam_addr = shd_base + (sizeof(u32) * ATA_REG_LBAM);
        port->lbah_addr = shd_base + (sizeof(u32) * ATA_REG_LBAH);
        port->device_addr = shd_base + (sizeof(u32) * ATA_REG_DEVICE);
        port->status_addr =
                port->command_addr = shd_base + (sizeof(u32) * ATA_REG_STATUS);
        /* special case: control/altstatus doesn't have ATA_REG_ address */
        port->altstatus_addr = port->ctl_addr = shd_base + SHD_CTL_AST_OFS;

        /* unused: */
        port->cmd_addr = port->bmdma_addr = port->scr_addr = NULL;

        /* Clear any currently outstanding port interrupt conditions */
        serr_ofs = mv_scr_offset(SCR_ERROR);
        writelfl(readl(port_mmio + serr_ofs), port_mmio + serr_ofs);
        writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);

        /* unmask all non-transient EDMA error interrupts */
        writelfl(~EDMA_ERR_IRQ_TRANSIENT, port_mmio + EDMA_ERR_IRQ_MASK_OFS);

        VPRINTK("EDMA cfg=0x%08x EDMA IRQ err cause/mask=0x%08x/0x%08x\n",
                readl(port_mmio + EDMA_CFG_OFS),
                readl(port_mmio + EDMA_ERR_IRQ_CAUSE_OFS),
                readl(port_mmio + EDMA_ERR_IRQ_MASK_OFS));
}

static unsigned int mv_in_pcix_mode(struct ata_host *host)
{
        struct mv_host_priv *hpriv = host->private_data;
        void __iomem *mmio = hpriv->base;
        u32 reg;

        if (IS_SOC(hpriv) || !IS_PCIE(hpriv))
                return 0;       /* not PCI-X capable */
        reg = readl(mmio + MV_PCI_MODE_OFS);
        if ((reg & MV_PCI_MODE_MASK) == 0)
                return 0;       /* conventional PCI mode */
        return 1;       /* chip is in PCI-X mode */
}

static int mv_pci_cut_through_okay(struct ata_host *host)
{
        struct mv_host_priv *hpriv = host->private_data;
        void __iomem *mmio = hpriv->base;
        u32 reg;

        if (!mv_in_pcix_mode(host)) {
                reg = readl(mmio + PCI_COMMAND_OFS);
                if (reg & PCI_COMMAND_MRDTRIG)
                        return 0; /* not okay */
        }
        return 1; /* okay */
}

static int mv_chip_id(struct ata_host *host, unsigned int board_idx)
{
        struct pci_dev *pdev = to_pci_dev(host->dev);
        struct mv_host_priv *hpriv = host->private_data;
        u32 hp_flags = hpriv->hp_flags;

        switch (board_idx) {
        case chip_5080:
                hpriv->ops = &mv5xxx_ops;
                hp_flags |= MV_HP_GEN_I;

                switch (pdev->revision) {
                case 0x1:
                        hp_flags |= MV_HP_ERRATA_50XXB0;
                        break;
                case 0x3:
                        hp_flags |= MV_HP_ERRATA_50XXB2;
                        break;
                default:
                        dev_printk(KERN_WARNING, &pdev->dev,
                           "Applying 50XXB2 workarounds to unknown rev\n");
                        hp_flags |= MV_HP_ERRATA_50XXB2;
                        break;
                }
                break;

        case chip_504x:
        case chip_508x:
                hpriv->ops = &mv5xxx_ops;
                hp_flags |= MV_HP_GEN_I;

                switch (pdev->revision) {
                case 0x0:
                        hp_flags |= MV_HP_ERRATA_50XXB0;
                        break;
                case 0x3:
                        hp_flags |= MV_HP_ERRATA_50XXB2;
                        break;
                default:
                        dev_printk(KERN_WARNING, &pdev->dev,
                           "Applying B2 workarounds to unknown rev\n");
                        hp_flags |= MV_HP_ERRATA_50XXB2;
                        break;
                }
                break;

        case chip_604x:
        case chip_608x:
                hpriv->ops = &mv6xxx_ops;
                hp_flags |= MV_HP_GEN_II;

                switch (pdev->revision) {
                case 0x7:
                        hp_flags |= MV_HP_ERRATA_60X1B2;
                        break;
                case 0x9:
                        hp_flags |= MV_HP_ERRATA_60X1C0;
                        break;
                default:
                        dev_printk(KERN_WARNING, &pdev->dev,
                                   "Applying B2 workarounds to unknown rev\n");
                        hp_flags |= MV_HP_ERRATA_60X1B2;
                        break;
                }
                break;

        case chip_7042:
                hp_flags |= MV_HP_PCIE | MV_HP_CUT_THROUGH;
                if (pdev->vendor == PCI_VENDOR_ID_TTI &&
                    (pdev->device == 0x2300 || pdev->device == 0x2310))
                {
                        /*
                         * Highpoint RocketRAID PCIe 23xx series cards:
                         *
                         * Unconfigured drives are treated as "Legacy"
                         * by the BIOS, and it overwrites sector 8 with
                         * a "Lgcy" metadata block prior to Linux boot.
                         *
                         * Configured drives (RAID or JBOD) leave sector 8
                         * alone, but instead overwrite a high numbered
                         * sector for the RAID metadata.  This sector can
                         * be determined exactly, by truncating the physical
                         * drive capacity to a nice even GB value.
                         *
                         * RAID metadata is at: (dev->n_sectors & ~0xfffff)
                         *
                         * Warn the user, lest they think we're just buggy.
                         */
                        printk(KERN_WARNING DRV_NAME ": Highpoint RocketRAID"
                                " BIOS CORRUPTS DATA on all attached drives,"
                                " regardless of if/how they are configured."
                                " BEWARE!\n");
                        printk(KERN_WARNING DRV_NAME ": For data safety, do not"
                                " use sectors 8-9 on \"Legacy\" drives,"
                                " and avoid the final two gigabytes on"
                                " all RocketRAID BIOS initialized drives.\n");
                }
                /* drop through */
        case chip_6042:
                hpriv->ops = &mv6xxx_ops;
                hp_flags |= MV_HP_GEN_IIE;
                if (board_idx == chip_6042 && mv_pci_cut_through_okay(host))
                        hp_flags |= MV_HP_CUT_THROUGH;

                switch (pdev->revision) {
                case 0x2: /* Rev.B0: the first/only public release */
                        hp_flags |= MV_HP_ERRATA_60X1C0;
                        break;
                default:
                        dev_printk(KERN_WARNING, &pdev->dev,
                           "Applying 60X1C0 workarounds to unknown rev\n");
                        hp_flags |= MV_HP_ERRATA_60X1C0;
                        break;
                }
                break;
        case chip_soc:
                hpriv->ops = &mv_soc_ops;
                hp_flags |= MV_HP_FLAG_SOC | MV_HP_GEN_IIE |
                        MV_HP_ERRATA_60X1C0;
                break;

        default:
                dev_printk(KERN_ERR, host->dev,
                           "BUG: invalid board index %u\n", board_idx);
                return 1;
        }

        hpriv->hp_flags = hp_flags;
        if (hp_flags & MV_HP_PCIE) {
                hpriv->irq_cause_ofs    = PCIE_IRQ_CAUSE_OFS;
                hpriv->irq_mask_ofs     = PCIE_IRQ_MASK_OFS;
                hpriv->unmask_all_irqs  = PCIE_UNMASK_ALL_IRQS;
        } else {
                hpriv->irq_cause_ofs    = PCI_IRQ_CAUSE_OFS;
                hpriv->irq_mask_ofs     = PCI_IRQ_MASK_OFS;
                hpriv->unmask_all_irqs  = PCI_UNMASK_ALL_IRQS;
        }

        return 0;
}

/**
 *      mv_init_host - Perform some early initialization of the host.
 *      @host: ATA host to initialize
 *      @board_idx: controller index
 *
 *      If possible, do an early global reset of the host.  Then do
 *      our port init and clear/unmask all/relevant host interrupts.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static int mv_init_host(struct ata_host *host, unsigned int board_idx)
{
        int rc = 0, n_hc, port, hc;
        struct mv_host_priv *hpriv = host->private_data;
        void __iomem *mmio = hpriv->base;

        rc = mv_chip_id(host, board_idx);
        if (rc)
                goto done;

        if (IS_SOC(hpriv)) {
                hpriv->main_irq_cause_addr = mmio + SOC_HC_MAIN_IRQ_CAUSE_OFS;
                hpriv->main_irq_mask_addr  = mmio + SOC_HC_MAIN_IRQ_MASK_OFS;
        } else {
                hpriv->main_irq_cause_addr = mmio + PCI_HC_MAIN_IRQ_CAUSE_OFS;
                hpriv->main_irq_mask_addr  = mmio + PCI_HC_MAIN_IRQ_MASK_OFS;
        }

        /* initialize shadow irq mask with register's value */
        hpriv->main_irq_mask = readl(hpriv->main_irq_mask_addr);

        /* global interrupt mask: 0 == mask everything */
        mv_set_main_irq_mask(host, ~0, 0);

        n_hc = mv_get_hc_count(host->ports[0]->flags);

        for (port = 0; port < host->n_ports; port++)
                hpriv->ops->read_preamp(hpriv, port, mmio);

        rc = hpriv->ops->reset_hc(hpriv, mmio, n_hc);
        if (rc)
                goto done;

        hpriv->ops->reset_flash(hpriv, mmio);
        hpriv->ops->reset_bus(host, mmio);
        hpriv->ops->enable_leds(hpriv, mmio);

        for (port = 0; port < host->n_ports; port++) {
                struct ata_port *ap = host->ports[port];
                void __iomem *port_mmio = mv_port_base(mmio, port);

                mv_port_init(&ap->ioaddr, port_mmio);

#ifdef CONFIG_PCI
                if (!IS_SOC(hpriv)) {
                        unsigned int offset = port_mmio - mmio;
                        ata_port_pbar_desc(ap, MV_PRIMARY_BAR, -1, "mmio");
                        ata_port_pbar_desc(ap, MV_PRIMARY_BAR, offset, "port");
                }
#endif
        }

        for (hc = 0; hc < n_hc; hc++) {
                void __iomem *hc_mmio = mv_hc_base(mmio, hc);

                VPRINTK("HC%i: HC config=0x%08x HC IRQ cause "
                        "(before clear)=0x%08x\n", hc,
                        readl(hc_mmio + HC_CFG_OFS),
                        readl(hc_mmio + HC_IRQ_CAUSE_OFS));

                /* Clear any currently outstanding hc interrupt conditions */
                writelfl(0, hc_mmio + HC_IRQ_CAUSE_OFS);
        }

        /* Clear any currently outstanding host interrupt conditions */
        writelfl(0, mmio + hpriv->irq_cause_ofs);

        /* and unmask interrupt generation for host regs */
        writelfl(hpriv->unmask_all_irqs, mmio + hpriv->irq_mask_ofs);

        /*
         * enable only global host interrupts for now.
         * The per-port interrupts get done later as ports are set up.
         */
        mv_set_main_irq_mask(host, 0, PCI_ERR);
done:
        return rc;
}

static int mv_create_dma_pools(struct mv_host_priv *hpriv, struct device *dev)
{
        hpriv->crqb_pool   = dmam_pool_create("crqb_q", dev, MV_CRQB_Q_SZ,
                                                             MV_CRQB_Q_SZ, 0);
        if (!hpriv->crqb_pool)
                return -ENOMEM;

        hpriv->crpb_pool   = dmam_pool_create("crpb_q", dev, MV_CRPB_Q_SZ,
                                                             MV_CRPB_Q_SZ, 0);
        if (!hpriv->crpb_pool)
                return -ENOMEM;

        hpriv->sg_tbl_pool = dmam_pool_create("sg_tbl", dev, MV_SG_TBL_SZ,
                                                             MV_SG_TBL_SZ, 0);
        if (!hpriv->sg_tbl_pool)
                return -ENOMEM;

        return 0;
}

static void mv_conf_mbus_windows(struct mv_host_priv *hpriv,
                                 struct mbus_dram_target_info *dram)
{
        int i;

        for (i = 0; i < 4; i++) {
                writel(0, hpriv->base + WINDOW_CTRL(i));
                writel(0, hpriv->base + WINDOW_BASE(i));
        }

        for (i = 0; i < dram->num_cs; i++) {
                struct mbus_dram_window *cs = dram->cs + i;

                writel(((cs->size - 1) & 0xffff0000) |
                        (cs->mbus_attr << 8) |
                        (dram->mbus_dram_target_id << 4) | 1,
                        hpriv->base + WINDOW_CTRL(i));
                writel(cs->base, hpriv->base + WINDOW_BASE(i));
        }
}

/**
 *      mv_platform_probe - handle a positive probe of an soc Marvell
 *      host
 *      @pdev: platform device found
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static int mv_platform_probe(struct platform_device *pdev)
{
        static int printed_version;
        const struct mv_sata_platform_data *mv_platform_data;
        const struct ata_port_info *ppi[] =
            { &mv_port_info[chip_soc], NULL };
        struct ata_host *host;
        struct mv_host_priv *hpriv;
        struct resource *res;
        int n_ports, rc;

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

        /*
         * Simple resource validation ..
         */
        if (unlikely(pdev->num_resources != 2)) {
                dev_err(&pdev->dev, "invalid number of resources\n");
                return -EINVAL;
        }

        /*
         * Get the register base first
         */
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (res == NULL)
                return -EINVAL;

        /* allocate host */
        mv_platform_data = pdev->dev.platform_data;
        n_ports = mv_platform_data->n_ports;

        host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
        hpriv = devm_kzalloc(&pdev->dev, sizeof(*hpriv), GFP_KERNEL);

        if (!host || !hpriv)
                return -ENOMEM;
        host->private_data = hpriv;
        hpriv->n_ports = n_ports;

        host->iomap = NULL;
        hpriv->base = devm_ioremap(&pdev->dev, res->start,
                                   res->end - res->start + 1);
        hpriv->base -= MV_SATAHC0_REG_BASE;

        /*
         * (Re-)program MBUS remapping windows if we are asked to.
         */
        if (mv_platform_data->dram != NULL)
                mv_conf_mbus_windows(hpriv, mv_platform_data->dram);

        rc = mv_create_dma_pools(hpriv, &pdev->dev);
        if (rc)
                return rc;

        /* initialize adapter */
        rc = mv_init_host(host, chip_soc);
        if (rc)
                return rc;

        dev_printk(KERN_INFO, &pdev->dev,
                   "slots %u ports %d\n", (unsigned)MV_MAX_Q_DEPTH,
                   host->n_ports);

        return ata_host_activate(host, platform_get_irq(pdev, 0), mv_interrupt,
                                 IRQF_SHARED, &mv6_sht);
}

/*
 *
 *      mv_platform_remove    -       unplug a platform interface
 *      @pdev: platform device
 *
 *      A platform bus SATA device has been unplugged. Perform the needed
 *      cleanup. Also called on module unload for any active devices.
 */
static int __devexit mv_platform_remove(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct ata_host *host = dev_get_drvdata(dev);

        ata_host_detach(host);
        return 0;
}

static struct platform_driver mv_platform_driver = {
        .probe                  = mv_platform_probe,
        .remove                 = __devexit_p(mv_platform_remove),
        .driver                 = {
                                   .name = DRV_NAME,
                                   .owner = THIS_MODULE,
                                  },
};


#ifdef CONFIG_PCI
static int mv_pci_init_one(struct pci_dev *pdev,
                           const struct pci_device_id *ent);


static struct pci_driver mv_pci_driver = {
        .name                   = DRV_NAME,
        .id_table               = mv_pci_tbl,
        .probe                  = mv_pci_init_one,
        .remove                 = ata_pci_remove_one,
};

/*
 * module options
 */
static int msi;       /* Use PCI msi; either zero (off, default) or non-zero */


/* move to PCI layer or libata core? */
static int pci_go_64(struct pci_dev *pdev)
{
        int rc;

        if (!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 rc;
}

/**
 *      mv_print_info - Dump key info to kernel log for perusal.
 *      @host: ATA host to print info about
 *
 *      FIXME: complete this.
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static void mv_print_info(struct ata_host *host)
{
        struct pci_dev *pdev = to_pci_dev(host->dev);
        struct mv_host_priv *hpriv = host->private_data;
        u8 scc;
        const char *scc_s, *gen;

        /* Use this to determine the HW stepping of the chip so we know
         * what errata to workaround
         */
        pci_read_config_byte(pdev, PCI_CLASS_DEVICE, &scc);
        if (scc == 0)
                scc_s = "SCSI";
        else if (scc == 0x01)
                scc_s = "RAID";
        else
                scc_s = "?";

        if (IS_GEN_I(hpriv))
                gen = "I";
        else if (IS_GEN_II(hpriv))
                gen = "II";
        else if (IS_GEN_IIE(hpriv))
                gen = "IIE";
        else
                gen = "?";

        dev_printk(KERN_INFO, &pdev->dev,
               "Gen-%s %u slots %u ports %s mode IRQ via %s\n",
               gen, (unsigned)MV_MAX_Q_DEPTH, host->n_ports,
               scc_s, (MV_HP_FLAG_MSI & hpriv->hp_flags) ? "MSI" : "INTx");
}

/**
 *      mv_pci_init_one - handle a positive probe of a PCI Marvell host
 *      @pdev: PCI device found
 *      @ent: PCI device ID entry for the matched host
 *
 *      LOCKING:
 *      Inherited from caller.
 */
static int mv_pci_init_one(struct pci_dev *pdev,
                           const struct pci_device_id *ent)
{
        static int printed_version;
        unsigned int board_idx = (unsigned int)ent->driver_data;
        const struct ata_port_info *ppi[] = { &mv_port_info[board_idx], NULL };
        struct ata_host *host;
        struct mv_host_priv *hpriv;
        int n_ports, rc;

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

        /* allocate host */
        n_ports = mv_get_hc_count(ppi[0]->flags) * MV_PORTS_PER_HC;

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

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

        rc = pcim_iomap_regions(pdev, 1 << MV_PRIMARY_BAR, DRV_NAME);
        if (rc == -EBUSY)
                pcim_pin_device(pdev);
        if (rc)
                return rc;
        host->iomap = pcim_iomap_table(pdev);
        hpriv->base = host->iomap[MV_PRIMARY_BAR];

        rc = pci_go_64(pdev);
        if (rc)
                return rc;

        rc = mv_create_dma_pools(hpriv, &pdev->dev);
        if (rc)
                return rc;

        /* initialize adapter */
        rc = mv_init_host(host, board_idx);
        if (rc)
                return rc;

        /* Enable message-switched interrupts, if requested */
        if (msi && pci_enable_msi(pdev) == 0)
                hpriv->hp_flags |= MV_HP_FLAG_MSI;

        mv_dump_pci_cfg(pdev, 0x68);
        mv_print_info(host);

        pci_set_master(pdev);
        pci_try_set_mwi(pdev);
        return ata_host_activate(host, pdev->irq, mv_interrupt, IRQF_SHARED,
                                 IS_GEN_I(hpriv) ? &mv5_sht : &mv6_sht);
}
#endif

static int mv_platform_probe(struct platform_device *pdev);
static int __devexit mv_platform_remove(struct platform_device *pdev);

static int __init mv_init(void)
{
        int rc = -ENODEV;
#ifdef CONFIG_PCI
        rc = pci_register_driver(&mv_pci_driver);
        if (rc < 0)
                return rc;
#endif
        rc = platform_driver_register(&mv_platform_driver);

#ifdef CONFIG_PCI
        if (rc < 0)
                pci_unregister_driver(&mv_pci_driver);
#endif
        return rc;
}

static void __exit mv_exit(void)
{
#ifdef CONFIG_PCI
        pci_unregister_driver(&mv_pci_driver);
#endif
        platform_driver_unregister(&mv_platform_driver);
}

MODULE_AUTHOR("Brett Russ");
MODULE_DESCRIPTION("SCSI low-level driver for Marvell SATA controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, mv_pci_tbl);
MODULE_VERSION(DRV_VERSION);
MODULE_ALIAS("platform:" DRV_NAME);

#ifdef CONFIG_PCI
module_param(msi, int, 0444);
MODULE_PARM_DESC(msi, "Enable use of PCI MSI (0=off, 1=on)");
#endif

module_init(mv_init);
module_exit(mv_exit);