// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * RapidIO mport driver for Tsi721 PCIExpress-to-SRIO bridge
 *
 * Copyright 2011 Integrated Device Technology, Inc.
 * Alexandre Bounine <alexandre.bounine@idt.com>
 * Chul Kim <chul.kim@idt.com>
 */

#include <linux/io.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/kfifo.h>
#include <linux/delay.h>

#include "tsi721.h"

#ifdef DEBUG
u32 tsi_dbg_level;
module_param_named(dbg_level, tsi_dbg_level, uint, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
#endif

static int pcie_mrrs = -1;
module_param(pcie_mrrs, int, S_IRUGO);
MODULE_PARM_DESC(pcie_mrrs, "PCIe MRRS override value (0...5)");

static u8 mbox_sel = 0x0f;
module_param(mbox_sel, byte, S_IRUGO);
MODULE_PARM_DESC(mbox_sel,
                 "RIO Messaging MBOX Selection Mask (default: 0x0f = all)");

static DEFINE_SPINLOCK(tsi721_maint_lock);

static void tsi721_omsg_handler(struct tsi721_device *priv, int ch);
static void tsi721_imsg_handler(struct tsi721_device *priv, int ch);

/**
 * tsi721_lcread - read from local SREP config space
 * @mport: RapidIO master port info
 * @index: ID of RapdiIO interface
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @data: Value to be read into
 *
 * Generates a local SREP space read. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int tsi721_lcread(struct rio_mport *mport, int index, u32 offset,
                         int len, u32 *data)
{
        struct tsi721_device *priv = mport->priv;

        if (len != sizeof(u32))
                return -EINVAL; /* only 32-bit access is supported */

        *data = ioread32(priv->regs + offset);

        return 0;
}

/**
 * tsi721_lcwrite - write into local SREP config space
 * @mport: RapidIO master port info
 * @index: ID of RapdiIO interface
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @data: Value to be written
 *
 * Generates a local write into SREP configuration space. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int tsi721_lcwrite(struct rio_mport *mport, int index, u32 offset,
                          int len, u32 data)
{
        struct tsi721_device *priv = mport->priv;

        if (len != sizeof(u32))
                return -EINVAL; /* only 32-bit access is supported */

        iowrite32(data, priv->regs + offset);

        return 0;
}

/**
 * tsi721_maint_dma - Helper function to generate RapidIO maintenance
 *                    transactions using designated Tsi721 DMA channel.
 * @priv: pointer to tsi721 private data
 * @sys_size: RapdiIO transport system size
 * @destid: Destination ID of transaction
 * @hopcount: Number of hops to target device
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @data: Location to be read from or write into
 * @do_wr: Operation flag (1 == MAINT_WR)
 *
 * Generates a RapidIO maintenance transaction (Read or Write).
 * Returns %0 on success and %-EINVAL or %-EFAULT on failure.
 */
static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
                        u16 destid, u8 hopcount, u32 offset, int len,
                        u32 *data, int do_wr)
{
        void __iomem *regs = priv->regs + TSI721_DMAC_BASE(priv->mdma.ch_id);
        struct tsi721_dma_desc *bd_ptr;
        u32 rd_count, swr_ptr, ch_stat;
        unsigned long flags;
        int i, err = 0;
        u32 op = do_wr ? MAINT_WR : MAINT_RD;

        if (offset > (RIO_MAINT_SPACE_SZ - len) || (len != sizeof(u32)))
                return -EINVAL;

        spin_lock_irqsave(&tsi721_maint_lock, flags);

        bd_ptr = priv->mdma.bd_base;

        rd_count = ioread32(regs + TSI721_DMAC_DRDCNT);

        /* Initialize DMA descriptor */
        bd_ptr[0].type_id = cpu_to_le32((DTYPE2 << 29) | (op << 19) | destid);
        bd_ptr[0].bcount = cpu_to_le32((sys_size << 26) | 0x04);
        bd_ptr[0].raddr_lo = cpu_to_le32((hopcount << 24) | offset);
        bd_ptr[0].raddr_hi = 0;
        if (do_wr)
                bd_ptr[0].data[0] = cpu_to_be32p(data);
        else
                bd_ptr[0].data[0] = 0xffffffff;

        mb();

        /* Start DMA operation */
        iowrite32(rd_count + 2, regs + TSI721_DMAC_DWRCNT);
        ioread32(regs + TSI721_DMAC_DWRCNT);
        i = 0;

        /* Wait until DMA transfer is finished */
        while ((ch_stat = ioread32(regs + TSI721_DMAC_STS))
                                                        & TSI721_DMAC_STS_RUN) {
                udelay(1);
                if (++i >= 5000000) {
                        tsi_debug(MAINT, &priv->pdev->dev,
                                "DMA[%d] read timeout ch_status=%x",
                                priv->mdma.ch_id, ch_stat);
                        if (!do_wr)
                                *data = 0xffffffff;
                        err = -EIO;
                        goto err_out;
                }
        }

        if (ch_stat & TSI721_DMAC_STS_ABORT) {
                /* If DMA operation aborted due to error,
                 * reinitialize DMA channel
                 */
                tsi_debug(MAINT, &priv->pdev->dev, "DMA ABORT ch_stat=%x",
                          ch_stat);
                tsi_debug(MAINT, &priv->pdev->dev,
                          "OP=%d : destid=%x hc=%x off=%x",
                          do_wr ? MAINT_WR : MAINT_RD,
                          destid, hopcount, offset);
                iowrite32(TSI721_DMAC_INT_ALL, regs + TSI721_DMAC_INT);
                iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
                udelay(10);
                iowrite32(0, regs + TSI721_DMAC_DWRCNT);
                udelay(1);
                if (!do_wr)
                        *data = 0xffffffff;
                err = -EIO;
                goto err_out;
        }

        if (!do_wr)
                *data = be32_to_cpu(bd_ptr[0].data[0]);

        /*
         * Update descriptor status FIFO RD pointer.
         * NOTE: Skipping check and clear FIFO entries because we are waiting
         * for transfer to be completed.
         */
        swr_ptr = ioread32(regs + TSI721_DMAC_DSWP);
        iowrite32(swr_ptr, regs + TSI721_DMAC_DSRP);

err_out:
        spin_unlock_irqrestore(&tsi721_maint_lock, flags);

        return err;
}

/**
 * tsi721_cread_dma - Generate a RapidIO maintenance read transaction
 *                    using Tsi721 BDMA engine.
 * @mport: RapidIO master port control structure
 * @index: ID of RapdiIO interface
 * @destid: Destination ID of transaction
 * @hopcount: Number of hops to target device
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @val: Location to be read into
 *
 * Generates a RapidIO maintenance read transaction.
 * Returns %0 on success and %-EINVAL or %-EFAULT on failure.
 */
static int tsi721_cread_dma(struct rio_mport *mport, int index, u16 destid,
                        u8 hopcount, u32 offset, int len, u32 *data)
{
        struct tsi721_device *priv = mport->priv;

        return tsi721_maint_dma(priv, mport->sys_size, destid, hopcount,
                                offset, len, data, 0);
}

/**
 * tsi721_cwrite_dma - Generate a RapidIO maintenance write transaction
 *                     using Tsi721 BDMA engine
 * @mport: RapidIO master port control structure
 * @index: ID of RapdiIO interface
 * @destid: Destination ID of transaction
 * @hopcount: Number of hops to target device
 * @offset: Offset into configuration space
 * @len: Length (in bytes) of the maintenance transaction
 * @val: Value to be written
 *
 * Generates a RapidIO maintenance write transaction.
 * Returns %0 on success and %-EINVAL or %-EFAULT on failure.
 */
static int tsi721_cwrite_dma(struct rio_mport *mport, int index, u16 destid,
                         u8 hopcount, u32 offset, int len, u32 data)
{
        struct tsi721_device *priv = mport->priv;
        u32 temp = data;

        return tsi721_maint_dma(priv, mport->sys_size, destid, hopcount,
                                offset, len, &temp, 1);
}

/**
 * tsi721_pw_handler - Tsi721 inbound port-write interrupt handler
 * @priv:  tsi721 device private structure
 *
 * Handles inbound port-write interrupts. Copies PW message from an internal
 * buffer into PW message FIFO and schedules deferred routine to process
 * queued messages.
 */
static int
tsi721_pw_handler(struct tsi721_device *priv)
{
        u32 pw_stat;
        u32 pw_buf[TSI721_RIO_PW_MSG_SIZE/sizeof(u32)];


        pw_stat = ioread32(priv->regs + TSI721_RIO_PW_RX_STAT);

        if (pw_stat & TSI721_RIO_PW_RX_STAT_PW_VAL) {
                pw_buf[0] = ioread32(priv->regs + TSI721_RIO_PW_RX_CAPT(0));
                pw_buf[1] = ioread32(priv->regs + TSI721_RIO_PW_RX_CAPT(1));
                pw_buf[2] = ioread32(priv->regs + TSI721_RIO_PW_RX_CAPT(2));
                pw_buf[3] = ioread32(priv->regs + TSI721_RIO_PW_RX_CAPT(3));

                /* Queue PW message (if there is room in FIFO),
                 * otherwise discard it.
                 */
                spin_lock(&priv->pw_fifo_lock);
                if (kfifo_avail(&priv->pw_fifo) >= TSI721_RIO_PW_MSG_SIZE)
                        kfifo_in(&priv->pw_fifo, pw_buf,
                                                TSI721_RIO_PW_MSG_SIZE);
                else
                        priv->pw_discard_count++;
                spin_unlock(&priv->pw_fifo_lock);
        }

        /* Clear pending PW interrupts */
        iowrite32(TSI721_RIO_PW_RX_STAT_PW_DISC | TSI721_RIO_PW_RX_STAT_PW_VAL,
                  priv->regs + TSI721_RIO_PW_RX_STAT);

        schedule_work(&priv->pw_work);

        return 0;
}

static void tsi721_pw_dpc(struct work_struct *work)
{
        struct tsi721_device *priv = container_of(work, struct tsi721_device,
                                                    pw_work);
        union rio_pw_msg pwmsg;

        /*
         * Process port-write messages
         */
        while (kfifo_out_spinlocked(&priv->pw_fifo, (unsigned char *)&pwmsg,
                         TSI721_RIO_PW_MSG_SIZE, &priv->pw_fifo_lock)) {
                /* Pass the port-write message to RIO core for processing */
                rio_inb_pwrite_handler(&priv->mport, &pwmsg);
        }
}

/**
 * tsi721_pw_enable - enable/disable port-write interface init
 * @mport: Master port implementing the port write unit
 * @enable:    1=enable; 0=disable port-write message handling
 */
static int tsi721_pw_enable(struct rio_mport *mport, int enable)
{
        struct tsi721_device *priv = mport->priv;
        u32 rval;

        rval = ioread32(priv->regs + TSI721_RIO_EM_INT_ENABLE);

        if (enable)
                rval |= TSI721_RIO_EM_INT_ENABLE_PW_RX;
        else
                rval &= ~TSI721_RIO_EM_INT_ENABLE_PW_RX;

        /* Clear pending PW interrupts */
        iowrite32(TSI721_RIO_PW_RX_STAT_PW_DISC | TSI721_RIO_PW_RX_STAT_PW_VAL,
                  priv->regs + TSI721_RIO_PW_RX_STAT);
        /* Update enable bits */
        iowrite32(rval, priv->regs + TSI721_RIO_EM_INT_ENABLE);

        return 0;
}

/**
 * tsi721_dsend - Send a RapidIO doorbell
 * @mport: RapidIO master port info
 * @index: ID of RapidIO interface
 * @destid: Destination ID of target device
 * @data: 16-bit info field of RapidIO doorbell
 *
 * Sends a RapidIO doorbell message. Always returns %0.
 */
static int tsi721_dsend(struct rio_mport *mport, int index,
                        u16 destid, u16 data)
{
        struct tsi721_device *priv = mport->priv;
        u32 offset;

        offset = (((mport->sys_size) ? RIO_TT_CODE_16 : RIO_TT_CODE_8) << 18) |
                 (destid << 2);

        tsi_debug(DBELL, &priv->pdev->dev,
                  "Send Doorbell 0x%04x to destID 0x%x", data, destid);
        iowrite16be(data, priv->odb_base + offset);

        return 0;
}

/**
 * tsi721_dbell_handler - Tsi721 doorbell interrupt handler
 * @priv: tsi721 device-specific data structure
 *
 * Handles inbound doorbell interrupts. Copies doorbell entry from an internal
 * buffer into DB message FIFO and schedules deferred  routine to process
 * queued DBs.
 */
static int
tsi721_dbell_handler(struct tsi721_device *priv)
{
        u32 regval;

        /* Disable IDB interrupts */
        regval = ioread32(priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
        regval &= ~TSI721_SR_CHINT_IDBQRCV;
        iowrite32(regval,
                priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));

        schedule_work(&priv->idb_work);

        return 0;
}

static void tsi721_db_dpc(struct work_struct *work)
{
        struct tsi721_device *priv = container_of(work, struct tsi721_device,
                                                    idb_work);
        struct rio_mport *mport;
        struct rio_dbell *dbell;
        int found = 0;
        u32 wr_ptr, rd_ptr;
        u64 *idb_entry;
        u32 regval;
        union {
                u64 msg;
                u8  bytes[8];
        } idb;

        /*
         * Process queued inbound doorbells
         */
        mport = &priv->mport;

        wr_ptr = ioread32(priv->regs + TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
        rd_ptr = ioread32(priv->regs + TSI721_IDQ_RP(IDB_QUEUE)) % IDB_QSIZE;

        while (wr_ptr != rd_ptr) {
                idb_entry = (u64 *)(priv->idb_base +
                                        (TSI721_IDB_ENTRY_SIZE * rd_ptr));
                rd_ptr++;
                rd_ptr %= IDB_QSIZE;
                idb.msg = *idb_entry;
                *idb_entry = 0;

                /* Process one doorbell */
                list_for_each_entry(dbell, &mport->dbells, node) {
                        if ((dbell->res->start <= DBELL_INF(idb.bytes)) &&
                            (dbell->res->end >= DBELL_INF(idb.bytes))) {
                                found = 1;
                                break;
                        }
                }

                if (found) {
                        dbell->dinb(mport, dbell->dev_id, DBELL_SID(idb.bytes),
                                    DBELL_TID(idb.bytes), DBELL_INF(idb.bytes));
                } else {
                        tsi_debug(DBELL, &priv->pdev->dev,
                                  "spurious IDB sid %2.2x tid %2.2x info %4.4x",
                                  DBELL_SID(idb.bytes), DBELL_TID(idb.bytes),
                                  DBELL_INF(idb.bytes));
                }

                wr_ptr = ioread32(priv->regs +
                                  TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
        }

        iowrite32(rd_ptr & (IDB_QSIZE - 1),
                priv->regs + TSI721_IDQ_RP(IDB_QUEUE));

        /* Re-enable IDB interrupts */
        regval = ioread32(priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
        regval |= TSI721_SR_CHINT_IDBQRCV;
        iowrite32(regval,
                priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));

        wr_ptr = ioread32(priv->regs + TSI721_IDQ_WP(IDB_QUEUE)) % IDB_QSIZE;
        if (wr_ptr != rd_ptr)
                schedule_work(&priv->idb_work);
}

/**
 * tsi721_irqhandler - Tsi721 interrupt handler
 * @irq: Linux interrupt number
 * @ptr: Pointer to interrupt-specific data (tsi721_device structure)
 *
 * Handles Tsi721 interrupts signaled using MSI and INTA. Checks reported
 * interrupt events and calls an event-specific handler(s).
 */
static irqreturn_t tsi721_irqhandler(int irq, void *ptr)
{
        struct tsi721_device *priv = (struct tsi721_device *)ptr;
        u32 dev_int;
        u32 dev_ch_int;
        u32 intval;
        u32 ch_inte;

        /* For MSI mode disable all device-level interrupts */
        if (priv->flags & TSI721_USING_MSI)
                iowrite32(0, priv->regs + TSI721_DEV_INTE);

        dev_int = ioread32(priv->regs + TSI721_DEV_INT);
        if (!dev_int)
                return IRQ_NONE;

        dev_ch_int = ioread32(priv->regs + TSI721_DEV_CHAN_INT);

        if (dev_int & TSI721_DEV_INT_SR2PC_CH) {
                /* Service SR2PC Channel interrupts */
                if (dev_ch_int & TSI721_INT_SR2PC_CHAN(IDB_QUEUE)) {
                        /* Service Inbound Doorbell interrupt */
                        intval = ioread32(priv->regs +
                                                TSI721_SR_CHINT(IDB_QUEUE));
                        if (intval & TSI721_SR_CHINT_IDBQRCV)
                                tsi721_dbell_handler(priv);
                        else
                                tsi_info(&priv->pdev->dev,
                                        "Unsupported SR_CH_INT %x", intval);

                        /* Clear interrupts */
                        iowrite32(intval,
                                priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
                        ioread32(priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
                }
        }

        if (dev_int & TSI721_DEV_INT_SMSG_CH) {
                int ch;

                /*
                 * Service channel interrupts from Messaging Engine
                 */

                if (dev_ch_int & TSI721_INT_IMSG_CHAN_M) { /* Inbound Msg */
                        /* Disable signaled OB MSG Channel interrupts */
                        ch_inte = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
                        ch_inte &= ~(dev_ch_int & TSI721_INT_IMSG_CHAN_M);
                        iowrite32(ch_inte, priv->regs + TSI721_DEV_CHAN_INTE);

                        /*
                         * Process Inbound Message interrupt for each MBOX
                         */
                        for (ch = 4; ch < RIO_MAX_MBOX + 4; ch++) {
                                if (!(dev_ch_int & TSI721_INT_IMSG_CHAN(ch)))
                                        continue;
                                tsi721_imsg_handler(priv, ch);
                        }
                }

                if (dev_ch_int & TSI721_INT_OMSG_CHAN_M) { /* Outbound Msg */
                        /* Disable signaled OB MSG Channel interrupts */
                        ch_inte = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
                        ch_inte &= ~(dev_ch_int & TSI721_INT_OMSG_CHAN_M);
                        iowrite32(ch_inte, priv->regs + TSI721_DEV_CHAN_INTE);

                        /*
                         * Process Outbound Message interrupts for each MBOX
                         */

                        for (ch = 0; ch < RIO_MAX_MBOX; ch++) {
                                if (!(dev_ch_int & TSI721_INT_OMSG_CHAN(ch)))
                                        continue;
                                tsi721_omsg_handler(priv, ch);
                        }
                }
        }

        if (dev_int & TSI721_DEV_INT_SRIO) {
                /* Service SRIO MAC interrupts */
                intval = ioread32(priv->regs + TSI721_RIO_EM_INT_STAT);
                if (intval & TSI721_RIO_EM_INT_STAT_PW_RX)
                        tsi721_pw_handler(priv);
        }

#ifdef CONFIG_RAPIDIO_DMA_ENGINE
        if (dev_int & TSI721_DEV_INT_BDMA_CH) {
                int ch;

                if (dev_ch_int & TSI721_INT_BDMA_CHAN_M) {
                        tsi_debug(DMA, &priv->pdev->dev,
                                  "IRQ from DMA channel 0x%08x", dev_ch_int);

                        for (ch = 0; ch < TSI721_DMA_MAXCH; ch++) {
                                if (!(dev_ch_int & TSI721_INT_BDMA_CHAN(ch)))
                                        continue;
                                tsi721_bdma_handler(&priv->bdma[ch]);
                        }
                }
        }
#endif

        /* For MSI mode re-enable device-level interrupts */
        if (priv->flags & TSI721_USING_MSI) {
                dev_int = TSI721_DEV_INT_SR2PC_CH | TSI721_DEV_INT_SRIO |
                        TSI721_DEV_INT_SMSG_CH | TSI721_DEV_INT_BDMA_CH;
                iowrite32(dev_int, priv->regs + TSI721_DEV_INTE);
        }

        return IRQ_HANDLED;
}

static void tsi721_interrupts_init(struct tsi721_device *priv)
{
        u32 intr;

        /* Enable IDB interrupts */
        iowrite32(TSI721_SR_CHINT_ALL,
                priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
        iowrite32(TSI721_SR_CHINT_IDBQRCV,
                priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));

        /* Enable SRIO MAC interrupts */
        iowrite32(TSI721_RIO_EM_DEV_INT_EN_INT,
                priv->regs + TSI721_RIO_EM_DEV_INT_EN);

        /* Enable interrupts from channels in use */
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
        intr = TSI721_INT_SR2PC_CHAN(IDB_QUEUE) |
                (TSI721_INT_BDMA_CHAN_M &
                 ~TSI721_INT_BDMA_CHAN(TSI721_DMACH_MAINT));
#else
        intr = TSI721_INT_SR2PC_CHAN(IDB_QUEUE);
#endif
        iowrite32(intr, priv->regs + TSI721_DEV_CHAN_INTE);

        if (priv->flags & TSI721_USING_MSIX)
                intr = TSI721_DEV_INT_SRIO;
        else
                intr = TSI721_DEV_INT_SR2PC_CH | TSI721_DEV_INT_SRIO |
                        TSI721_DEV_INT_SMSG_CH | TSI721_DEV_INT_BDMA_CH;

        iowrite32(intr, priv->regs + TSI721_DEV_INTE);
        ioread32(priv->regs + TSI721_DEV_INTE);
}

#ifdef CONFIG_PCI_MSI
/**
 * tsi721_omsg_msix - MSI-X interrupt handler for outbound messaging
 * @irq: Linux interrupt number
 * @ptr: Pointer to interrupt-specific data (tsi721_device structure)
 *
 * Handles outbound messaging interrupts signaled using MSI-X.
 */
static irqreturn_t tsi721_omsg_msix(int irq, void *ptr)
{
        struct tsi721_device *priv = (struct tsi721_device *)ptr;
        int mbox;

        mbox = (irq - priv->msix[TSI721_VECT_OMB0_DONE].vector) % RIO_MAX_MBOX;
        tsi721_omsg_handler(priv, mbox);
        return IRQ_HANDLED;
}

/**
 * tsi721_imsg_msix - MSI-X interrupt handler for inbound messaging
 * @irq: Linux interrupt number
 * @ptr: Pointer to interrupt-specific data (tsi721_device structure)
 *
 * Handles inbound messaging interrupts signaled using MSI-X.
 */
static irqreturn_t tsi721_imsg_msix(int irq, void *ptr)
{
        struct tsi721_device *priv = (struct tsi721_device *)ptr;
        int mbox;

        mbox = (irq - priv->msix[TSI721_VECT_IMB0_RCV].vector) % RIO_MAX_MBOX;
        tsi721_imsg_handler(priv, mbox + 4);
        return IRQ_HANDLED;
}

/**
 * tsi721_srio_msix - Tsi721 MSI-X SRIO MAC interrupt handler
 * @irq: Linux interrupt number
 * @ptr: Pointer to interrupt-specific data (tsi721_device structure)
 *
 * Handles Tsi721 interrupts from SRIO MAC.
 */
static irqreturn_t tsi721_srio_msix(int irq, void *ptr)
{
        struct tsi721_device *priv = (struct tsi721_device *)ptr;
        u32 srio_int;

        /* Service SRIO MAC interrupts */
        srio_int = ioread32(priv->regs + TSI721_RIO_EM_INT_STAT);
        if (srio_int & TSI721_RIO_EM_INT_STAT_PW_RX)
                tsi721_pw_handler(priv);

        return IRQ_HANDLED;
}

/**
 * tsi721_sr2pc_ch_msix - Tsi721 MSI-X SR2PC Channel interrupt handler
 * @irq: Linux interrupt number
 * @ptr: Pointer to interrupt-specific data (tsi721_device structure)
 *
 * Handles Tsi721 interrupts from SR2PC Channel.
 * NOTE: At this moment services only one SR2PC channel associated with inbound
 * doorbells.
 */
static irqreturn_t tsi721_sr2pc_ch_msix(int irq, void *ptr)
{
        struct tsi721_device *priv = (struct tsi721_device *)ptr;
        u32 sr_ch_int;

        /* Service Inbound DB interrupt from SR2PC channel */
        sr_ch_int = ioread32(priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
        if (sr_ch_int & TSI721_SR_CHINT_IDBQRCV)
                tsi721_dbell_handler(priv);

        /* Clear interrupts */
        iowrite32(sr_ch_int, priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
        /* Read back to ensure that interrupt was cleared */
        sr_ch_int = ioread32(priv->regs + TSI721_SR_CHINT(IDB_QUEUE));

        return IRQ_HANDLED;
}

/**
 * tsi721_request_msix - register interrupt service for MSI-X mode.
 * @priv: tsi721 device-specific data structure
 *
 * Registers MSI-X interrupt service routines for interrupts that are active
 * immediately after mport initialization. Messaging interrupt service routines
 * should be registered during corresponding open requests.
 */
static int tsi721_request_msix(struct tsi721_device *priv)
{
        int err = 0;

        err = request_irq(priv->msix[TSI721_VECT_IDB].vector,
                        tsi721_sr2pc_ch_msix, 0,
                        priv->msix[TSI721_VECT_IDB].irq_name, (void *)priv);
        if (err)
                return err;

        err = request_irq(priv->msix[TSI721_VECT_PWRX].vector,
                        tsi721_srio_msix, 0,
                        priv->msix[TSI721_VECT_PWRX].irq_name, (void *)priv);
        if (err) {
                free_irq(priv->msix[TSI721_VECT_IDB].vector, (void *)priv);
                return err;
        }

        return 0;
}

/**
 * tsi721_enable_msix - Attempts to enable MSI-X support for Tsi721.
 * @priv: pointer to tsi721 private data
 *
 * Configures MSI-X support for Tsi721. Supports only an exact number
 * of requested vectors.
 */
static int tsi721_enable_msix(struct tsi721_device *priv)
{
        struct msix_entry entries[TSI721_VECT_MAX];
        int err;
        int i;

        entries[TSI721_VECT_IDB].entry = TSI721_MSIX_SR2PC_IDBQ_RCV(IDB_QUEUE);
        entries[TSI721_VECT_PWRX].entry = TSI721_MSIX_SRIO_MAC_INT;

        /*
         * Initialize MSI-X entries for Messaging Engine:
         * this driver supports four RIO mailboxes (inbound and outbound)
         * NOTE: Inbound message MBOX 0...4 use IB channels 4...7. Therefore
         * offset +4 is added to IB MBOX number.
         */
        for (i = 0; i < RIO_MAX_MBOX; i++) {
                entries[TSI721_VECT_IMB0_RCV + i].entry =
                                        TSI721_MSIX_IMSG_DQ_RCV(i + 4);
                entries[TSI721_VECT_IMB0_INT + i].entry =
                                        TSI721_MSIX_IMSG_INT(i + 4);
                entries[TSI721_VECT_OMB0_DONE + i].entry =
                                        TSI721_MSIX_OMSG_DONE(i);
                entries[TSI721_VECT_OMB0_INT + i].entry =
                                        TSI721_MSIX_OMSG_INT(i);
        }

#ifdef CONFIG_RAPIDIO_DMA_ENGINE
        /*
         * Initialize MSI-X entries for Block DMA Engine:
         * this driver supports XXX DMA channels
         * (one is reserved for SRIO maintenance transactions)
         */
        for (i = 0; i < TSI721_DMA_CHNUM; i++) {
                entries[TSI721_VECT_DMA0_DONE + i].entry =
                                        TSI721_MSIX_DMACH_DONE(i);
                entries[TSI721_VECT_DMA0_INT + i].entry =
                                        TSI721_MSIX_DMACH_INT(i);
        }
#endif /* CONFIG_RAPIDIO_DMA_ENGINE */

        err = pci_enable_msix_exact(priv->pdev, entries, ARRAY_SIZE(entries));
        if (err) {
                tsi_err(&priv->pdev->dev,
                        "Failed to enable MSI-X (err=%d)", err);
                return err;
        }

        /*
         * Copy MSI-X vector information into tsi721 private structure
         */
        priv->msix[TSI721_VECT_IDB].vector = entries[TSI721_VECT_IDB].vector;
        snprintf(priv->msix[TSI721_VECT_IDB].irq_name, IRQ_DEVICE_NAME_MAX,
                 DRV_NAME "-idb@pci:%s", pci_name(priv->pdev));
        priv->msix[TSI721_VECT_PWRX].vector = entries[TSI721_VECT_PWRX].vector;
        snprintf(priv->msix[TSI721_VECT_PWRX].irq_name, IRQ_DEVICE_NAME_MAX,
                 DRV_NAME "-pwrx@pci:%s", pci_name(priv->pdev));

        for (i = 0; i < RIO_MAX_MBOX; i++) {
                priv->msix[TSI721_VECT_IMB0_RCV + i].vector =
                                entries[TSI721_VECT_IMB0_RCV + i].vector;
                snprintf(priv->msix[TSI721_VECT_IMB0_RCV + i].irq_name,
                         IRQ_DEVICE_NAME_MAX, DRV_NAME "-imbr%d@pci:%s",
                         i, pci_name(priv->pdev));

                priv->msix[TSI721_VECT_IMB0_INT + i].vector =
                                entries[TSI721_VECT_IMB0_INT + i].vector;
                snprintf(priv->msix[TSI721_VECT_IMB0_INT + i].irq_name,
                         IRQ_DEVICE_NAME_MAX, DRV_NAME "-imbi%d@pci:%s",
                         i, pci_name(priv->pdev));

                priv->msix[TSI721_VECT_OMB0_DONE + i].vector =
                                entries[TSI721_VECT_OMB0_DONE + i].vector;
                snprintf(priv->msix[TSI721_VECT_OMB0_DONE + i].irq_name,
                         IRQ_DEVICE_NAME_MAX, DRV_NAME "-ombd%d@pci:%s",
                         i, pci_name(priv->pdev));

                priv->msix[TSI721_VECT_OMB0_INT + i].vector =
                                entries[TSI721_VECT_OMB0_INT + i].vector;
                snprintf(priv->msix[TSI721_VECT_OMB0_INT + i].irq_name,
                         IRQ_DEVICE_NAME_MAX, DRV_NAME "-ombi%d@pci:%s",
                         i, pci_name(priv->pdev));
        }

#ifdef CONFIG_RAPIDIO_DMA_ENGINE
        for (i = 0; i < TSI721_DMA_CHNUM; i++) {
                priv->msix[TSI721_VECT_DMA0_DONE + i].vector =
                                entries[TSI721_VECT_DMA0_DONE + i].vector;
                snprintf(priv->msix[TSI721_VECT_DMA0_DONE + i].irq_name,
                         IRQ_DEVICE_NAME_MAX, DRV_NAME "-dmad%d@pci:%s",
                         i, pci_name(priv->pdev));

                priv->msix[TSI721_VECT_DMA0_INT + i].vector =
                                entries[TSI721_VECT_DMA0_INT + i].vector;
                snprintf(priv->msix[TSI721_VECT_DMA0_INT + i].irq_name,
                         IRQ_DEVICE_NAME_MAX, DRV_NAME "-dmai%d@pci:%s",
                         i, pci_name(priv->pdev));
        }
#endif /* CONFIG_RAPIDIO_DMA_ENGINE */

        return 0;
}
#endif /* CONFIG_PCI_MSI */

static int tsi721_request_irq(struct tsi721_device *priv)
{
        int err;

#ifdef CONFIG_PCI_MSI
        if (priv->flags & TSI721_USING_MSIX)
                err = tsi721_request_msix(priv);
        else
#endif
                err = request_irq(priv->pdev->irq, tsi721_irqhandler,
                          (priv->flags & TSI721_USING_MSI) ? 0 : IRQF_SHARED,
                          DRV_NAME, (void *)priv);

        if (err)
                tsi_err(&priv->pdev->dev,
                        "Unable to allocate interrupt, err=%d", err);

        return err;
}

static void tsi721_free_irq(struct tsi721_device *priv)
{
#ifdef CONFIG_PCI_MSI
        if (priv->flags & TSI721_USING_MSIX) {
                free_irq(priv->msix[TSI721_VECT_IDB].vector, (void *)priv);
                free_irq(priv->msix[TSI721_VECT_PWRX].vector, (void *)priv);
        } else
#endif
        free_irq(priv->pdev->irq, (void *)priv);
}

static int
tsi721_obw_alloc(struct tsi721_device *priv, struct tsi721_obw_bar *pbar,
                 u32 size, int *win_id)
{
        u64 win_base;
        u64 bar_base;
        u64 bar_end;
        u32 align;
        struct tsi721_ob_win *win;
        struct tsi721_ob_win *new_win = NULL;
        int new_win_idx = -1;
        int i = 0;

        bar_base = pbar->base;
        bar_end =  bar_base + pbar->size;
        win_base = bar_base;
        align = size/TSI721_PC2SR_ZONES;

        while (i < TSI721_IBWIN_NUM) {
                for (i = 0; i < TSI721_IBWIN_NUM; i++) {
                        if (!priv->ob_win[i].active) {
                                if (new_win == NULL) {
                                        new_win = &priv->ob_win[i];
                                        new_win_idx = i;
                                }
                                continue;
                        }

                        /*
                         * If this window belongs to the current BAR check it
                         * for overlap
                         */
                        win = &priv->ob_win[i];

                        if (win->base >= bar_base && win->base < bar_end) {
                                if (win_base < (win->base + win->size) &&
                                                (win_base + size) > win->base) {
                                        /* Overlap detected */
                                        win_base = win->base + win->size;
                                        win_base = ALIGN(win_base, align);
                                        break;
                                }
                        }
                }
        }

        if (win_base + size > bar_end)
                return -ENOMEM;

        if (!new_win) {
                tsi_err(&priv->pdev->dev, "OBW count tracking failed");
                return -EIO;
        }

        new_win->active = true;
        new_win->base = win_base;
        new_win->size = size;
        new_win->pbar = pbar;
        priv->obwin_cnt--;
        pbar->free -= size;
        *win_id = new_win_idx;
        return 0;
}

static int tsi721_map_outb_win(struct rio_mport *mport, u16 destid, u64 rstart,
                        u32 size, u32 flags, dma_addr_t *laddr)
{
        struct tsi721_device *priv = mport->priv;
        int i;
        struct tsi721_obw_bar *pbar;
        struct tsi721_ob_win *ob_win;
        int obw = -1;
        u32 rval;
        u64 rio_addr;
        u32 zsize;
        int ret = -ENOMEM;

        tsi_debug(OBW, &priv->pdev->dev,
                  "did=%d ra=0x%llx sz=0x%x", destid, rstart, size);

        if (!is_power_of_2(size) || (size < 0x8000) || (rstart & (size - 1)))
                return -EINVAL;

        if (priv->obwin_cnt == 0)
                return -EBUSY;

        for (i = 0; i < 2; i++) {
                if (priv->p2r_bar[i].free >= size) {
                        pbar = &priv->p2r_bar[i];
                        ret = tsi721_obw_alloc(priv, pbar, size, &obw);
                        if (!ret)
                                break;
                }
        }

        if (ret)
                return ret;

        WARN_ON(obw == -1);
        ob_win = &priv->ob_win[obw];
        ob_win->destid = destid;
        ob_win->rstart = rstart;
        tsi_debug(OBW, &priv->pdev->dev,
                  "allocated OBW%d @%llx", obw, ob_win->base);

        /*
         * Configure Outbound Window
         */

        zsize = size/TSI721_PC2SR_ZONES;
        rio_addr = rstart;

        /*
         * Program Address Translation Zones:
         *  This implementation uses all 8 zones associated wit window.
         */
        for (i = 0; i < TSI721_PC2SR_ZONES; i++) {

                while (ioread32(priv->regs + TSI721_ZONE_SEL) &
                        TSI721_ZONE_SEL_GO) {
                        udelay(1);
                }

                rval = (u32)(rio_addr & TSI721_LUT_DATA0_ADD) |
                        TSI721_LUT_DATA0_NREAD | TSI721_LUT_DATA0_NWR;
                iowrite32(rval, priv->regs + TSI721_LUT_DATA0);
                rval = (u32)(rio_addr >> 32);
                iowrite32(rval, priv->regs + TSI721_LUT_DATA1);
                rval = destid;
                iowrite32(rval, priv->regs + TSI721_LUT_DATA2);

                rval = TSI721_ZONE_SEL_GO | (obw << 3) | i;
                iowrite32(rval, priv->regs + TSI721_ZONE_SEL);

                rio_addr += zsize;
        }

        iowrite32(TSI721_OBWIN_SIZE(size) << 8,
                  priv->regs + TSI721_OBWINSZ(obw));
        iowrite32((u32)(ob_win->base >> 32), priv->regs + TSI721_OBWINUB(obw));
        iowrite32((u32)(ob_win->base & TSI721_OBWINLB_BA) | TSI721_OBWINLB_WEN,
                  priv->regs + TSI721_OBWINLB(obw));

        *laddr = ob_win->base;
        return 0;
}

static void tsi721_unmap_outb_win(struct rio_mport *mport,
                                  u16 destid, u64 rstart)
{
        struct tsi721_device *priv = mport->priv;
        struct tsi721_ob_win *ob_win;
        int i;

        tsi_debug(OBW, &priv->pdev->dev, "did=%d ra=0x%llx", destid, rstart);

        for (i = 0; i < TSI721_OBWIN_NUM; i++) {
                ob_win = &priv->ob_win[i];

                if (ob_win->active &&
                    ob_win->destid == destid && ob_win->rstart == rstart) {
                        tsi_debug(OBW, &priv->pdev->dev,
                                  "free OBW%d @%llx", i, ob_win->base);
                        ob_win->active = false;
                        iowrite32(0, priv->regs + TSI721_OBWINLB(i));
                        ob_win->pbar->free += ob_win->size;
                        priv->obwin_cnt++;
                        break;
                }
        }
}

/**
 * tsi721_init_pc2sr_mapping - initializes outbound (PCIe->SRIO)
 * translation regions.
 * @priv: pointer to tsi721 private data
 *
 * Disables SREP translation regions.
 */
static void tsi721_init_pc2sr_mapping(struct tsi721_device *priv)
{
        int i, z;
        u32 rval;

        /* Disable all PC2SR translation windows */
        for (i = 0; i < TSI721_OBWIN_NUM; i++)
                iowrite32(0, priv->regs + TSI721_OBWINLB(i));

        /* Initialize zone lookup tables to avoid ECC errors on reads */
        iowrite32(0, priv->regs + TSI721_LUT_DATA0);
        iowrite32(0, priv->regs + TSI721_LUT_DATA1);
        iowrite32(0, priv->regs + TSI721_LUT_DATA2);

        for (i = 0; i < TSI721_OBWIN_NUM; i++) {
                for (z = 0; z < TSI721_PC2SR_ZONES; z++) {
                        while (ioread32(priv->regs + TSI721_ZONE_SEL) &
                                TSI721_ZONE_SEL_GO) {
                                udelay(1);
                        }
                        rval = TSI721_ZONE_SEL_GO | (i << 3) | z;
                        iowrite32(rval, priv->regs + TSI721_ZONE_SEL);
                }
        }

        if (priv->p2r_bar[0].size == 0 && priv->p2r_bar[1].size == 0) {
                priv->obwin_cnt = 0;
                return;
        }

        priv->p2r_bar[0].free = priv->p2r_bar[0].size;
        priv->p2r_bar[1].free = priv->p2r_bar[1].size;

        for (i = 0; i < TSI721_OBWIN_NUM; i++)
                priv->ob_win[i].active = false;

        priv->obwin_cnt = TSI721_OBWIN_NUM;
}

/**
 * tsi721_rio_map_inb_mem -- Mapping inbound memory region.
 * @mport: RapidIO master port
 * @lstart: Local memory space start address.
 * @rstart: RapidIO space start address.
 * @size: The mapping region size.
 * @flags: Flags for mapping. 0 for using default flags.
 *
 * Return: 0 -- Success.
 *
 * This function will create the inbound mapping
 * from rstart to lstart.
 */
static int tsi721_rio_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
                u64 rstart, u64 size, u32 flags)
{
        struct tsi721_device *priv = mport->priv;
        int i, avail = -1;
        u32 regval;
        struct tsi721_ib_win *ib_win;
        bool direct = (lstart == rstart);
        u64 ibw_size;
        dma_addr_t loc_start;
        u64 ibw_start;
        struct tsi721_ib_win_mapping *map = NULL;
        int ret = -EBUSY;

        /* Max IBW size supported by HW is 16GB */
        if (size > 0x400000000UL)
                return -EINVAL;

        if (direct) {
                /* Calculate minimal acceptable window size and base address */

                ibw_size = roundup_pow_of_two(size);
                ibw_start = lstart & ~(ibw_size - 1);

                tsi_debug(IBW, &priv->pdev->dev,
                        "Direct (RIO_0x%llx -> PCIe_%pad), size=0x%llx, ibw_start = 0x%llx",
                        rstart, &lstart, size, ibw_start);

                while ((lstart + size) > (ibw_start + ibw_size)) {
                        ibw_size *= 2;
                        ibw_start = lstart & ~(ibw_size - 1);
                        /* Check for crossing IBW max size 16GB */
                        if (ibw_size > 0x400000000UL)
                                return -EBUSY;
                }

                loc_start = ibw_start;

                map = kzalloc(sizeof(struct tsi721_ib_win_mapping), GFP_ATOMIC);
                if (map == NULL)
                        return -ENOMEM;

        } else {
                tsi_debug(IBW, &priv->pdev->dev,
                        "Translated (RIO_0x%llx -> PCIe_%pad), size=0x%llx",
                        rstart, &lstart, size);

                if (!is_power_of_2(size) || size < 0x1000 ||
                    ((u64)lstart & (size - 1)) || (rstart & (size - 1)))
                        return -EINVAL;
                if (priv->ibwin_cnt == 0)
                        return -EBUSY;
                ibw_start = rstart;
                ibw_size = size;
                loc_start = lstart;
        }

        /*
         * Scan for overlapping with active regions and mark the first available
         * IB window at the same time.
         */
        for (i = 0; i < TSI721_IBWIN_NUM; i++) {
                ib_win = &priv->ib_win[i];

                if (!ib_win->active) {
                        if (avail == -1) {
                                avail = i;
                                ret = 0;
                        }
                } else if (ibw_start < (ib_win->rstart + ib_win->size) &&
                           (ibw_start + ibw_size) > ib_win->rstart) {
                        /* Return error if address translation involved */
                        if (!direct || ib_win->xlat) {
                                ret = -EFAULT;
                                break;
                        }

                        /*
                         * Direct mappings usually are larger than originally
                         * requested fragments - check if this new request fits
                         * into it.
                         */
                        if (rstart >= ib_win->rstart &&
                            (rstart + size) <= (ib_win->rstart +
                                                        ib_win->size)) {
                                /* We are in - no further mapping required */
                                map->lstart = lstart;
                                list_add_tail(&map->node, &ib_win->mappings);
                                return 0;
                        }

                        ret = -EFAULT;
                        break;
                }
        }

        if (ret)
                goto out;
        i = avail;

        /* Sanity check: available IB window must be disabled at this point */
        regval = ioread32(priv->regs + TSI721_IBWIN_LB(i));
        if (WARN_ON(regval & TSI721_IBWIN_LB_WEN)) {
                ret = -EIO;
                goto out;
        }

        ib_win = &priv->ib_win[i];
        ib_win->active = true;
        ib_win->rstart = ibw_start;
        ib_win->lstart = loc_start;
        ib_win->size = ibw_size;
        ib_win->xlat = (lstart != rstart);
        INIT_LIST_HEAD(&ib_win->mappings);

        /*
         * When using direct IBW mapping and have larger than requested IBW size
         * we can have multiple local memory blocks mapped through the same IBW
         * To handle this situation we maintain list of "clients" for such IBWs.
         */
        if (direct) {
                map->lstart = lstart;
                list_add_tail(&map->node, &ib_win->mappings);
        }

        iowrite32(TSI721_IBWIN_SIZE(ibw_size) << 8,
                        priv->regs + TSI721_IBWIN_SZ(i));

        iowrite32(((u64)loc_start >> 32), priv->regs + TSI721_IBWIN_TUA(i));
        iowrite32(((u64)loc_start & TSI721_IBWIN_TLA_ADD),
                  priv->regs + TSI721_IBWIN_TLA(i));

        iowrite32(ibw_start >> 32, priv->regs + TSI721_IBWIN_UB(i));
        iowrite32((ibw_start & TSI721_IBWIN_LB_BA) | TSI721_IBWIN_LB_WEN,
                priv->regs + TSI721_IBWIN_LB(i));

        priv->ibwin_cnt--;

        tsi_debug(IBW, &priv->pdev->dev,
                "Configured IBWIN%d (RIO_0x%llx -> PCIe_%pad), size=0x%llx",
                i, ibw_start, &loc_start, ibw_size);

        return 0;
out:
        kfree(map);
        return ret;
}

/**
 * tsi721_rio_unmap_inb_mem -- Unmapping inbound memory region.
 * @mport: RapidIO master port
 * @lstart: Local memory space start address.
 */
static void tsi721_rio_unmap_inb_mem(struct rio_mport *mport,
                                dma_addr_t lstart)
{
        struct tsi721_device *priv = mport->priv;
        struct tsi721_ib_win *ib_win;
        int i;

        tsi_debug(IBW, &priv->pdev->dev,
                "Unmap IBW mapped to PCIe_%pad", &lstart);

        /* Search for matching active inbound translation window */
        for (i = 0; i < TSI721_IBWIN_NUM; i++) {
                ib_win = &priv->ib_win[i];

                /* Address translating IBWs must to be an exact march */
                if (!ib_win->active ||
                    (ib_win->xlat && lstart != ib_win->lstart))
                        continue;

                if (lstart >= ib_win->lstart &&
                    lstart < (ib_win->lstart + ib_win->size)) {

                        if (!ib_win->xlat) {
                                struct tsi721_ib_win_mapping *map;
                                int found = 0;

                                list_for_each_entry(map,
                                                    &ib_win->mappings, node) {
                                        if (map->lstart == lstart) {
                                                list_del(&map->node);
                                                kfree(map);
                                                found = 1;
                                                break;
                                        }
                                }

                                if (!found)
                                        continue;

                                if (!list_empty(&ib_win->mappings))
                                        break;
                        }

                        tsi_debug(IBW, &priv->pdev->dev, "Disable IBWIN_%d", i);
                        iowrite32(0, priv->regs + TSI721_IBWIN_LB(i));
                        ib_win->active = false;
                        priv->ibwin_cnt++;
                        break;
                }
        }

        if (i == TSI721_IBWIN_NUM)
                tsi_debug(IBW, &priv->pdev->dev,
                        "IB window mapped to %pad not found", &lstart);
}

/**
 * tsi721_init_sr2pc_mapping - initializes inbound (SRIO->PCIe)
 * translation regions.
 * @priv: pointer to tsi721 private data
 *
 * Disables inbound windows.
 */
static void tsi721_init_sr2pc_mapping(struct tsi721_device *priv)
{
        int i;

        /* Disable all SR2PC inbound windows */
        for (i = 0; i < TSI721_IBWIN_NUM; i++)
                iowrite32(0, priv->regs + TSI721_IBWIN_LB(i));
        priv->ibwin_cnt = TSI721_IBWIN_NUM;
}

/*
 * tsi721_close_sr2pc_mapping - closes all active inbound (SRIO->PCIe)
 * translation regions.
 * @priv: pointer to tsi721 device private data
 */
static void tsi721_close_sr2pc_mapping(struct tsi721_device *priv)
{
        struct tsi721_ib_win *ib_win;
        int i;

        /* Disable all active SR2PC inbound windows */
        for (i = 0; i < TSI721_IBWIN_NUM; i++) {
                ib_win = &priv->ib_win[i];
                if (ib_win->active) {
                        iowrite32(0, priv->regs + TSI721_IBWIN_LB(i));
                        ib_win->active = false;
                }
        }
}

/**
 * tsi721_port_write_init - Inbound port write interface init
 * @priv: pointer to tsi721 private data
 *
 * Initializes inbound port write handler.
 * Returns %0 on success or %-ENOMEM on failure.
 */
static int tsi721_port_write_init(struct tsi721_device *priv)
{
        priv->pw_discard_count = 0;
        INIT_WORK(&priv->pw_work, tsi721_pw_dpc);
        spin_lock_init(&priv->pw_fifo_lock);
        if (kfifo_alloc(&priv->pw_fifo,
                        TSI721_RIO_PW_MSG_SIZE * 32, GFP_KERNEL)) {
                tsi_err(&priv->pdev->dev, "PW FIFO allocation failed");
                return -ENOMEM;
        }

        /* Use reliable port-write capture mode */
        iowrite32(TSI721_RIO_PW_CTL_PWC_REL, priv->regs + TSI721_RIO_PW_CTL);
        return 0;
}

static void tsi721_port_write_free(struct tsi721_device *priv)
{
        kfifo_free(&priv->pw_fifo);
}

static int tsi721_doorbell_init(struct tsi721_device *priv)
{
        /* Outbound Doorbells do not require any setup.
         * Tsi721 uses dedicated PCI BAR1 to generate doorbells.
         * That BAR1 was mapped during the probe routine.
         */

        /* Initialize Inbound Doorbell processing DPC and queue */
        priv->db_discard_count = 0;
        INIT_WORK(&priv->idb_work, tsi721_db_dpc);

        /* Allocate buffer for inbound doorbells queue */
        priv->idb_base = dma_alloc_coherent(&priv->pdev->dev,
                                            IDB_QSIZE * TSI721_IDB_ENTRY_SIZE,
                                            &priv->idb_dma, GFP_KERNEL);
        if (!priv->idb_base)
                return -ENOMEM;

        tsi_debug(DBELL, &priv->pdev->dev,
                  "Allocated IDB buffer @ %p (phys = %pad)",
                  priv->idb_base, &priv->idb_dma);

        iowrite32(TSI721_IDQ_SIZE_VAL(IDB_QSIZE),
                priv->regs + TSI721_IDQ_SIZE(IDB_QUEUE));
        iowrite32(((u64)priv->idb_dma >> 32),
                priv->regs + TSI721_IDQ_BASEU(IDB_QUEUE));
        iowrite32(((u64)priv->idb_dma & TSI721_IDQ_BASEL_ADDR),
                priv->regs + TSI721_IDQ_BASEL(IDB_QUEUE));
        /* Enable accepting all inbound doorbells */
        iowrite32(0, priv->regs + TSI721_IDQ_MASK(IDB_QUEUE));

        iowrite32(TSI721_IDQ_INIT, priv->regs + TSI721_IDQ_CTL(IDB_QUEUE));

        iowrite32(0, priv->regs + TSI721_IDQ_RP(IDB_QUEUE));

        return 0;
}

static void tsi721_doorbell_free(struct tsi721_device *priv)
{
        if (priv->idb_base == NULL)
                return;

        /* Free buffer allocated for inbound doorbell queue */
        dma_free_coherent(&priv->pdev->dev, IDB_QSIZE * TSI721_IDB_ENTRY_SIZE,
                          priv->idb_base, priv->idb_dma);
        priv->idb_base = NULL;
}

/**
 * tsi721_bdma_maint_init - Initialize maintenance request BDMA channel.
 * @priv: pointer to tsi721 private data
 *
 * Initialize BDMA channel allocated for RapidIO maintenance read/write
 * request generation
 * Returns %0 on success or %-ENOMEM on failure.
 */
static int tsi721_bdma_maint_init(struct tsi721_device *priv)
{
        struct tsi721_dma_desc *bd_ptr;
        u64             *sts_ptr;
        dma_addr_t      bd_phys, sts_phys;
        int             sts_size;
        int             bd_num = 2;
        void __iomem    *regs;

        tsi_debug(MAINT, &priv->pdev->dev,
                  "Init BDMA_%d Maintenance requests", TSI721_DMACH_MAINT);

        /*
         * Initialize DMA channel for maintenance requests
         */

        priv->mdma.ch_id = TSI721_DMACH_MAINT;
        regs = priv->regs + TSI721_DMAC_BASE(TSI721_DMACH_MAINT);

        /* Allocate space for DMA descriptors */
        bd_ptr = dma_alloc_coherent(&priv->pdev->dev,
                                    bd_num * sizeof(struct tsi721_dma_desc),
                                    &bd_phys, GFP_KERNEL);
        if (!bd_ptr)
                return -ENOMEM;

        priv->mdma.bd_num = bd_num;
        priv->mdma.bd_phys = bd_phys;
        priv->mdma.bd_base = bd_ptr;

        tsi_debug(MAINT, &priv->pdev->dev, "DMA descriptors @ %p (phys = %pad)",
                  bd_ptr, &bd_phys);

        /* Allocate space for descriptor status FIFO */
        sts_size = (bd_num >= TSI721_DMA_MINSTSSZ) ?
                                        bd_num : TSI721_DMA_MINSTSSZ;
        sts_size = roundup_pow_of_two(sts_size);
        sts_ptr = dma_alloc_coherent(&priv->pdev->dev,
                                     sts_size * sizeof(struct tsi721_dma_sts),
                                     &sts_phys, GFP_KERNEL);
        if (!sts_ptr) {
                /* Free space allocated for DMA descriptors */
                dma_free_coherent(&priv->pdev->dev,
                                  bd_num * sizeof(struct tsi721_dma_desc),
                                  bd_ptr, bd_phys);
                priv->mdma.bd_base = NULL;
                return -ENOMEM;
        }

        priv->mdma.sts_phys = sts_phys;
        priv->mdma.sts_base = sts_ptr;
        priv->mdma.sts_size = sts_size;

        tsi_debug(MAINT, &priv->pdev->dev,
                "desc status FIFO @ %p (phys = %pad) size=0x%x",
                sts_ptr, &sts_phys, sts_size);

        /* Initialize DMA descriptors ring */
        bd_ptr[bd_num - 1].type_id = cpu_to_le32(DTYPE3 << 29);
        bd_ptr[bd_num - 1].next_lo = cpu_to_le32((u64)bd_phys &
                                                 TSI721_DMAC_DPTRL_MASK);
        bd_ptr[bd_num - 1].next_hi = cpu_to_le32((u64)bd_phys >> 32);

        /* Setup DMA descriptor pointers */
        iowrite32(((u64)bd_phys >> 32), regs + TSI721_DMAC_DPTRH);
        iowrite32(((u64)bd_phys & TSI721_DMAC_DPTRL_MASK),
                regs + TSI721_DMAC_DPTRL);

        /* Setup descriptor status FIFO */
        iowrite32(((u64)sts_phys >> 32), regs + TSI721_DMAC_DSBH);
        iowrite32(((u64)sts_phys & TSI721_DMAC_DSBL_MASK),
                regs + TSI721_DMAC_DSBL);
        iowrite32(TSI721_DMAC_DSSZ_SIZE(sts_size),
                regs + TSI721_DMAC_DSSZ);

        /* Clear interrupt bits */
        iowrite32(TSI721_DMAC_INT_ALL, regs + TSI721_DMAC_INT);

        ioread32(regs + TSI721_DMAC_INT);

        /* Toggle DMA channel initialization */
        iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
        ioread32(regs + TSI721_DMAC_CTL);
        udelay(10);

        return 0;
}

static int tsi721_bdma_maint_free(struct tsi721_device *priv)
{
        u32 ch_stat;
        struct tsi721_bdma_maint *mdma = &priv->mdma;
        void __iomem *regs = priv->regs + TSI721_DMAC_BASE(mdma->ch_id);

        if (mdma->bd_base == NULL)
                return 0;

        /* Check if DMA channel still running */
        ch_stat = ioread32(regs + TSI721_DMAC_STS);
        if (ch_stat & TSI721_DMAC_STS_RUN)
                return -EFAULT;

        /* Put DMA channel into init state */
        iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);

        /* Free space allocated for DMA descriptors */
        dma_free_coherent(&priv->pdev->dev,
                mdma->bd_num * sizeof(struct tsi721_dma_desc),
                mdma->bd_base, mdma->bd_phys);
        mdma->bd_base = NULL;

        /* Free space allocated for status FIFO */
        dma_free_coherent(&priv->pdev->dev,
                mdma->sts_size * sizeof(struct tsi721_dma_sts),
                mdma->sts_base, mdma->sts_phys);
        mdma->sts_base = NULL;
        return 0;
}

/* Enable Inbound Messaging Interrupts */
static void
tsi721_imsg_interrupt_enable(struct tsi721_device *priv, int ch,
                                  u32 inte_mask)
{
        u32 rval;

        if (!inte_mask)
                return;

        /* Clear pending Inbound Messaging interrupts */
        iowrite32(inte_mask, priv->regs + TSI721_IBDMAC_INT(ch));

        /* Enable Inbound Messaging interrupts */
        rval = ioread32(priv->regs + TSI721_IBDMAC_INTE(ch));
        iowrite32(rval | inte_mask, priv->regs + TSI721_IBDMAC_INTE(ch));

        if (priv->flags & TSI721_USING_MSIX)
                return; /* Finished if we are in MSI-X mode */

        /*
         * For MSI and INTA interrupt signalling we need to enable next levels
         */

        /* Enable Device Channel Interrupt */
        rval = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
        iowrite32(rval | TSI721_INT_IMSG_CHAN(ch),
                  priv->regs + TSI721_DEV_CHAN_INTE);
}

/* Disable Inbound Messaging Interrupts */
static void
tsi721_imsg_interrupt_disable(struct tsi721_device *priv, int ch,
                                   u32 inte_mask)
{
        u32 rval;

        if (!inte_mask)
                return;

        /* Clear pending Inbound Messaging interrupts */
        iowrite32(inte_mask, priv->regs + TSI721_IBDMAC_INT(ch));

        /* Disable Inbound Messaging interrupts */
        rval = ioread32(priv->regs + TSI721_IBDMAC_INTE(ch));
        rval &= ~inte_mask;
        iowrite32(rval, priv->regs + TSI721_IBDMAC_INTE(ch));

        if (priv->flags & TSI721_USING_MSIX)
                return; /* Finished if we are in MSI-X mode */

        /*
         * For MSI and INTA interrupt signalling we need to disable next levels
         */

        /* Disable Device Channel Interrupt */
        rval = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
        rval &= ~TSI721_INT_IMSG_CHAN(ch);
        iowrite32(rval, priv->regs + TSI721_DEV_CHAN_INTE);
}

/* Enable Outbound Messaging interrupts */
static void
tsi721_omsg_interrupt_enable(struct tsi721_device *priv, int ch,
                                  u32 inte_mask)
{
        u32 rval;

        if (!inte_mask)
                return;

        /* Clear pending Outbound Messaging interrupts */
        iowrite32(inte_mask, priv->regs + TSI721_OBDMAC_INT(ch));

        /* Enable Outbound Messaging channel interrupts */
        rval = ioread32(priv->regs + TSI721_OBDMAC_INTE(ch));
        iowrite32(rval | inte_mask, priv->regs + TSI721_OBDMAC_INTE(ch));

        if (priv->flags & TSI721_USING_MSIX)
                return; /* Finished if we are in MSI-X mode */

        /*
         * For MSI and INTA interrupt signalling we need to enable next levels
         */

        /* Enable Device Channel Interrupt */
        rval = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
        iowrite32(rval | TSI721_INT_OMSG_CHAN(ch),
                  priv->regs + TSI721_DEV_CHAN_INTE);
}

/* Disable Outbound Messaging interrupts */
static void
tsi721_omsg_interrupt_disable(struct tsi721_device *priv, int ch,
                                   u32 inte_mask)
{
        u32 rval;

        if (!inte_mask)
                return;

        /* Clear pending Outbound Messaging interrupts */
        iowrite32(inte_mask, priv->regs + TSI721_OBDMAC_INT(ch));

        /* Disable Outbound Messaging interrupts */
        rval = ioread32(priv->regs + TSI721_OBDMAC_INTE(ch));
        rval &= ~inte_mask;
        iowrite32(rval, priv->regs + TSI721_OBDMAC_INTE(ch));

        if (priv->flags & TSI721_USING_MSIX)
                return; /* Finished if we are in MSI-X mode */

        /*
         * For MSI and INTA interrupt signalling we need to disable next levels
         */

        /* Disable Device Channel Interrupt */
        rval = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
        rval &= ~TSI721_INT_OMSG_CHAN(ch);
        iowrite32(rval, priv->regs + TSI721_DEV_CHAN_INTE);
}

/**
 * tsi721_add_outb_message - Add message to the Tsi721 outbound message queue
 * @mport: Master port with outbound message queue
 * @rdev: Target of outbound message
 * @mbox: Outbound mailbox
 * @buffer: Message to add to outbound queue
 * @len: Length of message
 */
static int
tsi721_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
                        void *buffer, size_t len)
{
        struct tsi721_device *priv = mport->priv;
        struct tsi721_omsg_desc *desc;
        u32 tx_slot;
        unsigned long flags;

        if (!priv->omsg_init[mbox] ||
            len > TSI721_MSG_MAX_SIZE || len < 8)
                return -EINVAL;

        spin_lock_irqsave(&priv->omsg_ring[mbox].lock, flags);

        tx_slot = priv->omsg_ring[mbox].tx_slot;

        /* Copy copy message into transfer buffer */
        memcpy(priv->omsg_ring[mbox].omq_base[tx_slot], buffer, len);

        if (len & 0x7)
                len += 8;

        /* Build descriptor associated with buffer */
        desc = priv->omsg_ring[mbox].omd_base;
        desc[tx_slot].type_id = cpu_to_le32((DTYPE4 << 29) | rdev->destid);
#ifdef TSI721_OMSG_DESC_INT
        /* Request IOF_DONE interrupt generation for each N-th frame in queue */
        if (tx_slot % 4 == 0)
                desc[tx_slot].type_id |= cpu_to_le32(TSI721_OMD_IOF);
#endif
        desc[tx_slot].msg_info =
                cpu_to_le32((mport->sys_size << 26) | (mbox << 22) |
                            (0xe << 12) | (len & 0xff8));
        desc[tx_slot].bufptr_lo =
                cpu_to_le32((u64)priv->omsg_ring[mbox].omq_phys[tx_slot] &
                            0xffffffff);
        desc[tx_slot].bufptr_hi =
                cpu_to_le32((u64)priv->omsg_ring[mbox].omq_phys[tx_slot] >> 32);

        priv->omsg_ring[mbox].wr_count++;

        /* Go to next descriptor */
        if (++priv->omsg_ring[mbox].tx_slot == priv->omsg_ring[mbox].size) {
                priv->omsg_ring[mbox].tx_slot = 0;
                /* Move through the ring link descriptor at the end */
                priv->omsg_ring[mbox].wr_count++;
        }

        mb();

        /* Set new write count value */
        iowrite32(priv->omsg_ring[mbox].wr_count,
                priv->regs + TSI721_OBDMAC_DWRCNT(mbox));
        ioread32(priv->regs + TSI721_OBDMAC_DWRCNT(mbox));

        spin_unlock_irqrestore(&priv->omsg_ring[mbox].lock, flags);

        return 0;
}

/**
 * tsi721_omsg_handler - Outbound Message Interrupt Handler
 * @priv: pointer to tsi721 private data
 * @ch:   number of OB MSG channel to service
 *
 * Services channel interrupts from outbound messaging engine.
 */
static void tsi721_omsg_handler(struct tsi721_device *priv, int ch)
{
        u32 omsg_int;
        struct rio_mport *mport = &priv->mport;
        void *dev_id = NULL;
        u32 tx_slot = 0xffffffff;
        int do_callback = 0;

        spin_lock(&priv->omsg_ring[ch].lock);

        omsg_int = ioread32(priv->regs + TSI721_OBDMAC_INT(ch));

        if (omsg_int & TSI721_OBDMAC_INT_ST_FULL)
                tsi_info(&priv->pdev->dev,
                        "OB MBOX%d: Status FIFO is full", ch);

        if (omsg_int & (TSI721_OBDMAC_INT_DONE | TSI721_OBDMAC_INT_IOF_DONE)) {
                u32 srd_ptr;
                u64 *sts_ptr, last_ptr = 0, prev_ptr = 0;
                int i, j;

                /*
                 * Find last successfully processed descriptor
                 */

                /* Check and clear descriptor status FIFO entries */
                srd_ptr = priv->omsg_ring[ch].sts_rdptr;
                sts_ptr = priv->omsg_ring[ch].sts_base;
                j = srd_ptr * 8;
                while (sts_ptr[j]) {
                        for (i = 0; i < 8 && sts_ptr[j]; i++, j++) {
                                prev_ptr = last_ptr;
                                last_ptr = le64_to_cpu(sts_ptr[j]);
                                sts_ptr[j] = 0;
                        }

                        ++srd_ptr;
                        srd_ptr %= priv->omsg_ring[ch].sts_size;
                        j = srd_ptr * 8;
                }

                if (last_ptr == 0)
                        goto no_sts_update;

                priv->omsg_ring[ch].sts_rdptr = srd_ptr;
                iowrite32(srd_ptr, priv->regs + TSI721_OBDMAC_DSRP(ch));

                if (!mport->outb_msg[ch].mcback)
                        goto no_sts_update;

                /* Inform upper layer about transfer completion */

                tx_slot = (last_ptr - (u64)priv->omsg_ring[ch].omd_phys)/
                                                sizeof(struct tsi721_omsg_desc);

                /*
                 * Check if this is a Link Descriptor (LD).
                 * If yes, ignore LD and use descriptor processed
                 * before LD.
                 */
                if (tx_slot == priv->omsg_ring[ch].size) {
                        if (prev_ptr)
                                tx_slot = (prev_ptr -
                                        (u64)priv->omsg_ring[ch].omd_phys)/
                                                sizeof(struct tsi721_omsg_desc);
                        else
                                goto no_sts_update;
                }

                if (tx_slot >= priv->omsg_ring[ch].size)
                        tsi_debug(OMSG, &priv->pdev->dev,
                                  "OB_MSG tx_slot=%x > size=%x",
                                  tx_slot, priv->omsg_ring[ch].size);
                WARN_ON(tx_slot >= priv->omsg_ring[ch].size);

                /* Move slot index to the next message to be sent */
                ++tx_slot;
                if (tx_slot == priv->omsg_ring[ch].size)
                        tx_slot = 0;

                dev_id = priv->omsg_ring[ch].dev_id;
                do_callback = 1;
        }

no_sts_update:

        if (omsg_int & TSI721_OBDMAC_INT_ERROR) {
                /*
                * Outbound message operation aborted due to error,
                * reinitialize OB MSG channel
                */

                tsi_debug(OMSG, &priv->pdev->dev, "OB MSG ABORT ch_stat=%x",
                          ioread32(priv->regs + TSI721_OBDMAC_STS(ch)));

                iowrite32(TSI721_OBDMAC_INT_ERROR,
                                priv->regs + TSI721_OBDMAC_INT(ch));
                iowrite32(TSI721_OBDMAC_CTL_RETRY_THR | TSI721_OBDMAC_CTL_INIT,
                                priv->regs + TSI721_OBDMAC_CTL(ch));
                ioread32(priv->regs + TSI721_OBDMAC_CTL(ch));

                /* Inform upper level to clear all pending tx slots */
                dev_id = priv->omsg_ring[ch].dev_id;
                tx_slot = priv->omsg_ring[ch].tx_slot;
                do_callback = 1;

                /* Synch tx_slot tracking */
                iowrite32(priv->omsg_ring[ch].tx_slot,
                        priv->regs + TSI721_OBDMAC_DRDCNT(ch));
                ioread32(priv->regs + TSI721_OBDMAC_DRDCNT(ch));
                priv->omsg_ring[ch].wr_count = priv->omsg_ring[ch].tx_slot;
                priv->omsg_ring[ch].sts_rdptr = 0;
        }

        /* Clear channel interrupts */
        iowrite32(omsg_int, priv->regs + TSI721_OBDMAC_INT(ch));

        if (!(priv->flags & TSI721_USING_MSIX)) {
                u32 ch_inte;

                /* Re-enable channel interrupts */
                ch_inte = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
                ch_inte |= TSI721_INT_OMSG_CHAN(ch);
                iowrite32(ch_inte, priv->regs + TSI721_DEV_CHAN_INTE);
        }

        spin_unlock(&priv->omsg_ring[ch].lock);

        if (mport->outb_msg[ch].mcback && do_callback)
                mport->outb_msg[ch].mcback(mport, dev_id, ch, tx_slot);
}

/**
 * tsi721_open_outb_mbox - Initialize Tsi721 outbound mailbox
 * @mport: Master port implementing Outbound Messaging Engine
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox to open
 * @entries: Number of entries in the outbound mailbox ring
 */
static int tsi721_open_outb_mbox(struct rio_mport *mport, void *dev_id,
                                 int mbox, int entries)
{
        struct tsi721_device *priv = mport->priv;
        struct tsi721_omsg_desc *bd_ptr;
        int i, rc = 0;

        if ((entries < TSI721_OMSGD_MIN_RING_SIZE) ||
            (entries > (TSI721_OMSGD_RING_SIZE)) ||
            (!is_power_of_2(entries)) || mbox >= RIO_MAX_MBOX) {
                rc = -EINVAL;
                goto out;
        }

        if ((mbox_sel & (1 << mbox)) == 0) {
                rc = -ENODEV;
                goto out;
        }

        priv->omsg_ring[mbox].dev_id = dev_id;
        priv->omsg_ring[mbox].size = entries;
        priv->omsg_ring[mbox].sts_rdptr = 0;
        spin_lock_init(&priv->omsg_ring[mbox].lock);

        /* Outbound Msg Buffer allocation based on
           the number of maximum descriptor entries */
        for (i = 0; i < entries; i++) {
                priv->omsg_ring[mbox].omq_base[i] =
                        dma_alloc_coherent(
                                &priv->pdev->dev, TSI721_MSG_BUFFER_SIZE,
                                &priv->omsg_ring[mbox].omq_phys[i],
                                GFP_KERNEL);
                if (priv->omsg_ring[mbox].omq_base[i] == NULL) {
                        tsi_debug(OMSG, &priv->pdev->dev,
                                  "ENOMEM for OB_MSG_%d data buffer", mbox);
                        rc = -ENOMEM;
                        goto out_buf;
                }
        }

        /* Outbound message descriptor allocation */
        priv->omsg_ring[mbox].omd_base = dma_alloc_coherent(
                                &priv->pdev->dev,
                                (entries + 1) * sizeof(struct tsi721_omsg_desc),
                                &priv->omsg_ring[mbox].omd_phys, GFP_KERNEL);
        if (priv->omsg_ring[mbox].omd_base == NULL) {
                tsi_debug(OMSG, &priv->pdev->dev,
                        "ENOMEM for OB_MSG_%d descriptor memory", mbox);
                rc = -ENOMEM;
                goto out_buf;
        }

        priv->omsg_ring[mbox].tx_slot = 0;

        /* Outbound message descriptor status FIFO allocation */
        priv->omsg_ring[mbox].sts_size = roundup_pow_of_two(entries + 1);
        priv->omsg_ring[mbox].sts_base = dma_alloc_coherent(&priv->pdev->dev,
                                                            priv->omsg_ring[mbox].sts_size * sizeof(struct tsi721_dma_sts),
                                                            &priv->omsg_ring[mbox].sts_phys,
                                                            GFP_KERNEL);
        if (priv->omsg_ring[mbox].sts_base == NULL) {
                tsi_debug(OMSG, &priv->pdev->dev,
                        "ENOMEM for OB_MSG_%d status FIFO", mbox);
                rc = -ENOMEM;
                goto out_desc;
        }

        /*
         * Configure Outbound Messaging Engine
         */

        /* Setup Outbound Message descriptor pointer */
        iowrite32(((u64)priv->omsg_ring[mbox].omd_phys >> 32),
                        priv->regs + TSI721_OBDMAC_DPTRH(mbox));
        iowrite32(((u64)priv->omsg_ring[mbox].omd_phys &
                                        TSI721_OBDMAC_DPTRL_MASK),
                        priv->regs + TSI721_OBDMAC_DPTRL(mbox));

        /* Setup Outbound Message descriptor status FIFO */
        iowrite32(((u64)priv->omsg_ring[mbox].sts_phys >> 32),
                        priv->regs + TSI721_OBDMAC_DSBH(mbox));
        iowrite32(((u64)priv->omsg_ring[mbox].sts_phys &
                                        TSI721_OBDMAC_DSBL_MASK),
                        priv->regs + TSI721_OBDMAC_DSBL(mbox));
        iowrite32(TSI721_DMAC_DSSZ_SIZE(priv->omsg_ring[mbox].sts_size),
                priv->regs + (u32)TSI721_OBDMAC_DSSZ(mbox));

        /* Enable interrupts */

#ifdef CONFIG_PCI_MSI
        if (priv->flags & TSI721_USING_MSIX) {
                int idx = TSI721_VECT_OMB0_DONE + mbox;

                /* Request interrupt service if we are in MSI-X mode */
                rc = request_irq(priv->msix[idx].vector, tsi721_omsg_msix, 0,
                                 priv->msix[idx].irq_name, (void *)priv);

                if (rc) {
                        tsi_debug(OMSG, &priv->pdev->dev,
                                "Unable to get MSI-X IRQ for OBOX%d-DONE",
                                mbox);
                        goto out_stat;
                }

                idx = TSI721_VECT_OMB0_INT + mbox;
                rc = request_irq(priv->msix[idx].vector, tsi721_omsg_msix, 0,
                                 priv->msix[idx].irq_name, (void *)priv);

                if (rc) {
                        tsi_debug(OMSG, &priv->pdev->dev,
                                "Unable to get MSI-X IRQ for MBOX%d-INT", mbox);
                        idx = TSI721_VECT_OMB0_DONE + mbox;
                        free_irq(priv->msix[idx].vector, (void *)priv);
                        goto out_stat;
                }
        }
#endif /* CONFIG_PCI_MSI */

        tsi721_omsg_interrupt_enable(priv, mbox, TSI721_OBDMAC_INT_ALL);

        /* Initialize Outbound Message descriptors ring */
        bd_ptr = priv->omsg_ring[mbox].omd_base;
        bd_ptr[entries].type_id = cpu_to_le32(DTYPE5 << 29);
        bd_ptr[entries].msg_info = 0;
        bd_ptr[entries].next_lo =
                cpu_to_le32((u64)priv->omsg_ring[mbox].omd_phys &
                TSI721_OBDMAC_DPTRL_MASK);
        bd_ptr[entries].next_hi =

                cpu_to_le32((u64)priv->omsg_ring[mbox].omd_phys >> 32);
        priv->omsg_ring[mbox].wr_count = 0;
        mb();

        /* Initialize Outbound Message engine */
        iowrite32(TSI721_OBDMAC_CTL_RETRY_THR | TSI721_OBDMAC_CTL_INIT,
                  priv->regs + TSI721_OBDMAC_CTL(mbox));
        ioread32(priv->regs + TSI721_OBDMAC_DWRCNT(mbox));
        udelay(10);

        priv->omsg_init[mbox] = 1;

        return 0;

#ifdef CONFIG_PCI_MSI
out_stat:
        dma_free_coherent(&priv->pdev->dev,
                priv->omsg_ring[mbox].sts_size * sizeof(struct tsi721_dma_sts),
                priv->omsg_ring[mbox].sts_base,
                priv->omsg_ring[mbox].sts_phys);

        priv->omsg_ring[mbox].sts_base = NULL;
#endif /* CONFIG_PCI_MSI */

out_desc:
        dma_free_coherent(&priv->pdev->dev,
                (entries + 1) * sizeof(struct tsi721_omsg_desc),
                priv->omsg_ring[mbox].omd_base,
                priv->omsg_ring[mbox].omd_phys);

        priv->omsg_ring[mbox].omd_base = NULL;

out_buf:
        for (i = 0; i < priv->omsg_ring[mbox].size; i++) {
                if (priv->omsg_ring[mbox].omq_base[i]) {
                        dma_free_coherent(&priv->pdev->dev,
                                TSI721_MSG_BUFFER_SIZE,
                                priv->omsg_ring[mbox].omq_base[i],
                                priv->omsg_ring[mbox].omq_phys[i]);

                        priv->omsg_ring[mbox].omq_base[i] = NULL;
                }
        }

out:
        return rc;
}

/**
 * tsi721_close_outb_mbox - Close Tsi721 outbound mailbox
 * @mport: Master port implementing the outbound message unit
 * @mbox: Mailbox to close
 */
static void tsi721_close_outb_mbox(struct rio_mport *mport, int mbox)
{
        struct tsi721_device *priv = mport->priv;
        u32 i;

        if (!priv->omsg_init[mbox])
                return;
        priv->omsg_init[mbox] = 0;

        /* Disable Interrupts */

        tsi721_omsg_interrupt_disable(priv, mbox, TSI721_OBDMAC_INT_ALL);

#ifdef CONFIG_PCI_MSI
        if (priv->flags & TSI721_USING_MSIX) {
                free_irq(priv->msix[TSI721_VECT_OMB0_DONE + mbox].vector,
                         (void *)priv);
                free_irq(priv->msix[TSI721_VECT_OMB0_INT + mbox].vector,
                         (void *)priv);
        }
#endif /* CONFIG_PCI_MSI */

        /* Free OMSG Descriptor Status FIFO */
        dma_free_coherent(&priv->pdev->dev,
                priv->omsg_ring[mbox].sts_size * sizeof(struct tsi721_dma_sts),
                priv->omsg_ring[mbox].sts_base,
                priv->omsg_ring[mbox].sts_phys);

        priv->omsg_ring[mbox].sts_base = NULL;

        /* Free OMSG descriptors */
        dma_free_coherent(&priv->pdev->dev,
                (priv->omsg_ring[mbox].size + 1) *
                        sizeof(struct tsi721_omsg_desc),
                priv->omsg_ring[mbox].omd_base,
                priv->omsg_ring[mbox].omd_phys);

        priv->omsg_ring[mbox].omd_base = NULL;

        /* Free message buffers */
        for (i = 0; i < priv->omsg_ring[mbox].size; i++) {
                if (priv->omsg_ring[mbox].omq_base[i]) {
                        dma_free_coherent(&priv->pdev->dev,
                                TSI721_MSG_BUFFER_SIZE,
                                priv->omsg_ring[mbox].omq_base[i],
                                priv->omsg_ring[mbox].omq_phys[i]);

                        priv->omsg_ring[mbox].omq_base[i] = NULL;
                }
        }
}

/**
 * tsi721_imsg_handler - Inbound Message Interrupt Handler
 * @priv: pointer to tsi721 private data
 * @ch: inbound message channel number to service
 *
 * Services channel interrupts from inbound messaging engine.
 */
static void tsi721_imsg_handler(struct tsi721_device *priv, int ch)
{
        u32 mbox = ch - 4;
        u32 imsg_int;
        struct rio_mport *mport = &priv->mport;

        spin_lock(&priv->imsg_ring[mbox].lock);

        imsg_int = ioread32(priv->regs + TSI721_IBDMAC_INT(ch));

        if (imsg_int & TSI721_IBDMAC_INT_SRTO)
                tsi_info(&priv->pdev->dev, "IB MBOX%d SRIO timeout", mbox);

        if (imsg_int & TSI721_IBDMAC_INT_PC_ERROR)
                tsi_info(&priv->pdev->dev, "IB MBOX%d PCIe error", mbox);

        if (imsg_int & TSI721_IBDMAC_INT_FQ_LOW)
                tsi_info(&priv->pdev->dev, "IB MBOX%d IB free queue low", mbox);

        /* Clear IB channel interrupts */
        iowrite32(imsg_int, priv->regs + TSI721_IBDMAC_INT(ch));

        /* If an IB Msg is received notify the upper layer */
        if (imsg_int & TSI721_IBDMAC_INT_DQ_RCV &&
                mport->inb_msg[mbox].mcback)
                mport->inb_msg[mbox].mcback(mport,
                                priv->imsg_ring[mbox].dev_id, mbox, -1);

        if (!(priv->flags & TSI721_USING_MSIX)) {
                u32 ch_inte;

                /* Re-enable channel interrupts */
                ch_inte = ioread32(priv->regs + TSI721_DEV_CHAN_INTE);
                ch_inte |= TSI721_INT_IMSG_CHAN(ch);
                iowrite32(ch_inte, priv->regs + TSI721_DEV_CHAN_INTE);
        }

        spin_unlock(&priv->imsg_ring[mbox].lock);
}

/**
 * tsi721_open_inb_mbox - Initialize Tsi721 inbound mailbox
 * @mport: Master port implementing the Inbound Messaging Engine
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox to open
 * @entries: Number of entries in the inbound mailbox ring
 */
static int tsi721_open_inb_mbox(struct rio_mport *mport, void *dev_id,
                                int mbox, int entries)
{
        struct tsi721_device *priv = mport->priv;
        int ch = mbox + 4;
        int i;
        u64 *free_ptr;
        int rc = 0;

        if ((entries < TSI721_IMSGD_MIN_RING_SIZE) ||
            (entries > TSI721_IMSGD_RING_SIZE) ||
            (!is_power_of_2(entries)) || mbox >= RIO_MAX_MBOX) {
                rc = -EINVAL;
                goto out;
        }

        if ((mbox_sel & (1 << mbox)) == 0) {
                rc = -ENODEV;
                goto out;
        }

        /* Initialize IB Messaging Ring */
        priv->imsg_ring[mbox].dev_id = dev_id;
        priv->imsg_ring[mbox].size = entries;
        priv->imsg_ring[mbox].rx_slot = 0;
        priv->imsg_ring[mbox].desc_rdptr = 0;
        priv->imsg_ring[mbox].fq_wrptr = 0;
        for (i = 0; i < priv->imsg_ring[mbox].size; i++)
                priv->imsg_ring[mbox].imq_base[i] = NULL;
        spin_lock_init(&priv->imsg_ring[mbox].lock);

        /* Allocate buffers for incoming messages */
        priv->imsg_ring[mbox].buf_base =
                dma_alloc_coherent(&priv->pdev->dev,
                                   entries * TSI721_MSG_BUFFER_SIZE,
                                   &priv->imsg_ring[mbox].buf_phys,
                                   GFP_KERNEL);

        if (priv->imsg_ring[mbox].buf_base == NULL) {
                tsi_err(&priv->pdev->dev,
                        "Failed to allocate buffers for IB MBOX%d", mbox);
                rc = -ENOMEM;
                goto out;
        }

        /* Allocate memory for circular free list */
        priv->imsg_ring[mbox].imfq_base =
                dma_alloc_coherent(&priv->pdev->dev,
                                   entries * 8,
                                   &priv->imsg_ring[mbox].imfq_phys,
                                   GFP_KERNEL);

        if (priv->imsg_ring[mbox].imfq_base == NULL) {
                tsi_err(&priv->pdev->dev,
                        "Failed to allocate free queue for IB MBOX%d", mbox);
                rc = -ENOMEM;
                goto out_buf;
        }

        /* Allocate memory for Inbound message descriptors */
        priv->imsg_ring[mbox].imd_base =
                dma_alloc_coherent(&priv->pdev->dev,
                                   entries * sizeof(struct tsi721_imsg_desc),
                                   &priv->imsg_ring[mbox].imd_phys, GFP_KERNEL);

        if (priv->imsg_ring[mbox].imd_base == NULL) {
                tsi_err(&priv->pdev->dev,
                        "Failed to allocate descriptor memory for IB MBOX%d",
                        mbox);
                rc = -ENOMEM;
                goto out_dma;
        }

        /* Fill free buffer pointer list */
        free_ptr = priv->imsg_ring[mbox].imfq_base;
        for (i = 0; i < entries; i++)
                free_ptr[i] = cpu_to_le64(
                                (u64)(priv->imsg_ring[mbox].buf_phys) +
                                i * 0x1000);

        mb();

        /*
         * For mapping of inbound SRIO Messages into appropriate queues we need
         * to set Inbound Device ID register in the messaging engine. We do it
         * once when first inbound mailbox is requested.
         */
        if (!(priv->flags & TSI721_IMSGID_SET)) {
                iowrite32((u32)priv->mport.host_deviceid,
                        priv->regs + TSI721_IB_DEVID);
                priv->flags |= TSI721_IMSGID_SET;
        }

        /*
         * Configure Inbound Messaging channel (ch = mbox + 4)
         */

        /* Setup Inbound Message free queue */
        iowrite32(((u64)priv->imsg_ring[mbox].imfq_phys >> 32),
                priv->regs + TSI721_IBDMAC_FQBH(ch));
        iowrite32(((u64)priv->imsg_ring[mbox].imfq_phys &
                        TSI721_IBDMAC_FQBL_MASK),
                priv->regs+TSI721_IBDMAC_FQBL(ch));
        iowrite32(TSI721_DMAC_DSSZ_SIZE(entries),
                priv->regs + TSI721_IBDMAC_FQSZ(ch));

        /* Setup Inbound Message descriptor queue */
        iowrite32(((u64)priv->imsg_ring[mbox].imd_phys >> 32),
                priv->regs + TSI721_IBDMAC_DQBH(ch));
        iowrite32(((u32)priv->imsg_ring[mbox].imd_phys &
                   (u32)TSI721_IBDMAC_DQBL_MASK),
                priv->regs+TSI721_IBDMAC_DQBL(ch));
        iowrite32(TSI721_DMAC_DSSZ_SIZE(entries),
                priv->regs + TSI721_IBDMAC_DQSZ(ch));

        /* Enable interrupts */

#ifdef CONFIG_PCI_MSI
        if (priv->flags & TSI721_USING_MSIX) {
                int idx = TSI721_VECT_IMB0_RCV + mbox;

                /* Request interrupt service if we are in MSI-X mode */
                rc = request_irq(priv->msix[idx].vector, tsi721_imsg_msix, 0,
                                 priv->msix[idx].irq_name, (void *)priv);

                if (rc) {
                        tsi_debug(IMSG, &priv->pdev->dev,
                                "Unable to get MSI-X IRQ for IBOX%d-DONE",
                                mbox);
                        goto out_desc;
                }

                idx = TSI721_VECT_IMB0_INT + mbox;
                rc = request_irq(priv->msix[idx].vector, tsi721_imsg_msix, 0,
                                 priv->msix[idx].irq_name, (void *)priv);

                if (rc) {
                        tsi_debug(IMSG, &priv->pdev->dev,
                                "Unable to get MSI-X IRQ for IBOX%d-INT", mbox);
                        free_irq(
                                priv->msix[TSI721_VECT_IMB0_RCV + mbox].vector,
                                (void *)priv);
                        goto out_desc;
                }
        }
#endif /* CONFIG_PCI_MSI */

        tsi721_imsg_interrupt_enable(priv, ch, TSI721_IBDMAC_INT_ALL);

        /* Initialize Inbound Message Engine */
        iowrite32(TSI721_IBDMAC_CTL_INIT, priv->regs + TSI721_IBDMAC_CTL(ch));
        ioread32(priv->regs + TSI721_IBDMAC_CTL(ch));
        udelay(10);
        priv->imsg_ring[mbox].fq_wrptr = entries - 1;
        iowrite32(entries - 1, priv->regs + TSI721_IBDMAC_FQWP(ch));

        priv->imsg_init[mbox] = 1;
        return 0;

#ifdef CONFIG_PCI_MSI
out_desc:
        dma_free_coherent(&priv->pdev->dev,
                priv->imsg_ring[mbox].size * sizeof(struct tsi721_imsg_desc),
                priv->imsg_ring[mbox].imd_base,
                priv->imsg_ring[mbox].imd_phys);

        priv->imsg_ring[mbox].imd_base = NULL;
#endif /* CONFIG_PCI_MSI */

out_dma:
        dma_free_coherent(&priv->pdev->dev,
                priv->imsg_ring[mbox].size * 8,
                priv->imsg_ring[mbox].imfq_base,
                priv->imsg_ring[mbox].imfq_phys);

        priv->imsg_ring[mbox].imfq_base = NULL;

out_buf:
        dma_free_coherent(&priv->pdev->dev,
                priv->imsg_ring[mbox].size * TSI721_MSG_BUFFER_SIZE,
                priv->imsg_ring[mbox].buf_base,
                priv->imsg_ring[mbox].buf_phys);

        priv->imsg_ring[mbox].buf_base = NULL;

out:
        return rc;
}

/**
 * tsi721_close_inb_mbox - Shut down Tsi721 inbound mailbox
 * @mport: Master port implementing the Inbound Messaging Engine
 * @mbox: Mailbox to close
 */
static void tsi721_close_inb_mbox(struct rio_mport *mport, int mbox)
{
        struct tsi721_device *priv = mport->priv;
        u32 rx_slot;
        int ch = mbox + 4;

        if (!priv->imsg_init[mbox]) /* mbox isn't initialized yet */
                return;
        priv->imsg_init[mbox] = 0;

        /* Disable Inbound Messaging Engine */

        /* Disable Interrupts */
        tsi721_imsg_interrupt_disable(priv, ch, TSI721_OBDMAC_INT_MASK);

#ifdef CONFIG_PCI_MSI
        if (priv->flags & TSI721_USING_MSIX) {
                free_irq(priv->msix[TSI721_VECT_IMB0_RCV + mbox].vector,
                                (void *)priv);
                free_irq(priv->msix[TSI721_VECT_IMB0_INT + mbox].vector,
                                (void *)priv);
        }
#endif /* CONFIG_PCI_MSI */

        /* Clear Inbound Buffer Queue */
        for (rx_slot = 0; rx_slot < priv->imsg_ring[mbox].size; rx_slot++)
                priv->imsg_ring[mbox].imq_base[rx_slot] = NULL;

        /* Free memory allocated for message buffers */
        dma_free_coherent(&priv->pdev->dev,
                priv->imsg_ring[mbox].size * TSI721_MSG_BUFFER_SIZE,
                priv->imsg_ring[mbox].buf_base,
                priv->imsg_ring[mbox].buf_phys);

        priv->imsg_ring[mbox].buf_base = NULL;

        /* Free memory allocated for free pointr list */
        dma_free_coherent(&priv->pdev->dev,
                priv->imsg_ring[mbox].size * 8,
                priv->imsg_ring[mbox].imfq_base,
                priv->imsg_ring[mbox].imfq_phys);

        priv->imsg_ring[mbox].imfq_base = NULL;

        /* Free memory allocated for RX descriptors */
        dma_free_coherent(&priv->pdev->dev,
                priv->imsg_ring[mbox].size * sizeof(struct tsi721_imsg_desc),
                priv->imsg_ring[mbox].imd_base,
                priv->imsg_ring[mbox].imd_phys);

        priv->imsg_ring[mbox].imd_base = NULL;
}

/**
 * tsi721_add_inb_buffer - Add buffer to the Tsi721 inbound message queue
 * @mport: Master port implementing the Inbound Messaging Engine
 * @mbox: Inbound mailbox number
 * @buf: Buffer to add to inbound queue
 */
static int tsi721_add_inb_buffer(struct rio_mport *mport, int mbox, void *buf)
{
        struct tsi721_device *priv = mport->priv;
        u32 rx_slot;
        int rc = 0;

        rx_slot = priv->imsg_ring[mbox].rx_slot;
        if (priv->imsg_ring[mbox].imq_base[rx_slot]) {
                tsi_err(&priv->pdev->dev,
                        "Error adding inbound buffer %d, buffer exists",
                        rx_slot);
                rc = -EINVAL;
                goto out;
        }

        priv->imsg_ring[mbox].imq_base[rx_slot] = buf;

        if (++priv->imsg_ring[mbox].rx_slot == priv->imsg_ring[mbox].size)
                priv->imsg_ring[mbox].rx_slot = 0;

out:
        return rc;
}

/**
 * tsi721_get_inb_message - Fetch inbound message from the Tsi721 MSG Queue
 * @mport: Master port implementing the Inbound Messaging Engine
 * @mbox: Inbound mailbox number
 *
 * Returns pointer to the message on success or NULL on failure.
 */
static void *tsi721_get_inb_message(struct rio_mport *mport, int mbox)
{
        struct tsi721_device *priv = mport->priv;
        struct tsi721_imsg_desc *desc;
        u32 rx_slot;
        void *rx_virt = NULL;
        u64 rx_phys;
        void *buf = NULL;
        u64 *free_ptr;
        int ch = mbox + 4;
        int msg_size;

        if (!priv->imsg_init[mbox])
                return NULL;

        desc = priv->imsg_ring[mbox].imd_base;
        desc += priv->imsg_ring[mbox].desc_rdptr;

        if (!(le32_to_cpu(desc->msg_info) & TSI721_IMD_HO))
                goto out;

        rx_slot = priv->imsg_ring[mbox].rx_slot;
        while (priv->imsg_ring[mbox].imq_base[rx_slot] == NULL) {
                if (++rx_slot == priv->imsg_ring[mbox].size)
                        rx_slot = 0;
        }

        rx_phys = ((u64)le32_to_cpu(desc->bufptr_hi) << 32) |
                        le32_to_cpu(desc->bufptr_lo);

        rx_virt = priv->imsg_ring[mbox].buf_base +
                  (rx_phys - (u64)priv->imsg_ring[mbox].buf_phys);

        buf = priv->imsg_ring[mbox].imq_base[rx_slot];
        msg_size = le32_to_cpu(desc->msg_info) & TSI721_IMD_BCOUNT;
        if (msg_size == 0)
                msg_size = RIO_MAX_MSG_SIZE;

        memcpy(buf, rx_virt, msg_size);
        priv->imsg_ring[mbox].imq_base[rx_slot] = NULL;

        desc->msg_info &= cpu_to_le32(~TSI721_IMD_HO);
        if (++priv->imsg_ring[mbox].desc_rdptr == priv->imsg_ring[mbox].size)
                priv->imsg_ring[mbox].desc_rdptr = 0;

        iowrite32(priv->imsg_ring[mbox].desc_rdptr,
                priv->regs + TSI721_IBDMAC_DQRP(ch));

        /* Return free buffer into the pointer list */
        free_ptr = priv->imsg_ring[mbox].imfq_base;
        free_ptr[priv->imsg_ring[mbox].fq_wrptr] = cpu_to_le64(rx_phys);

        if (++priv->imsg_ring[mbox].fq_wrptr == priv->imsg_ring[mbox].size)
                priv->imsg_ring[mbox].fq_wrptr = 0;

        iowrite32(priv->imsg_ring[mbox].fq_wrptr,
                priv->regs + TSI721_IBDMAC_FQWP(ch));
out:
        return buf;
}

/**
 * tsi721_messages_init - Initialization of Messaging Engine
 * @priv: pointer to tsi721 private data
 *
 * Configures Tsi721 messaging engine.
 */
static int tsi721_messages_init(struct tsi721_device *priv)
{
        int     ch;

        iowrite32(0, priv->regs + TSI721_SMSG_ECC_LOG);
        iowrite32(0, priv->regs + TSI721_RETRY_GEN_CNT);
        iowrite32(0, priv->regs + TSI721_RETRY_RX_CNT);

        /* Set SRIO Message Request/Response Timeout */
        iowrite32(TSI721_RQRPTO_VAL, priv->regs + TSI721_RQRPTO);

        /* Initialize Inbound Messaging Engine Registers */
        for (ch = 0; ch < TSI721_IMSG_CHNUM; ch++) {
                /* Clear interrupt bits */
                iowrite32(TSI721_IBDMAC_INT_MASK,
                        priv->regs + TSI721_IBDMAC_INT(ch));
                /* Clear Status */
                iowrite32(0, priv->regs + TSI721_IBDMAC_STS(ch));

                iowrite32(TSI721_SMSG_ECC_COR_LOG_MASK,
                                priv->regs + TSI721_SMSG_ECC_COR_LOG(ch));
                iowrite32(TSI721_SMSG_ECC_NCOR_MASK,
                                priv->regs + TSI721_SMSG_ECC_NCOR(ch));
        }

        return 0;
}

/**
 * tsi721_query_mport - Fetch inbound message from the Tsi721 MSG Queue
 * @mport: Master port implementing the Inbound Messaging Engine
 * @mbox: Inbound mailbox number
 *
 * Returns pointer to the message on success or NULL on failure.
 */
static int tsi721_query_mport(struct rio_mport *mport,
                              struct rio_mport_attr *attr)
{
        struct tsi721_device *priv = mport->priv;
        u32 rval;

        rval = ioread32(priv->regs + 0x100 + RIO_PORT_N_ERR_STS_CSR(0, 0));
        if (rval & RIO_PORT_N_ERR_STS_PORT_OK) {
                rval = ioread32(priv->regs + 0x100 + RIO_PORT_N_CTL2_CSR(0, 0));
                attr->link_speed = (rval & RIO_PORT_N_CTL2_SEL_BAUD) >> 28;
                rval = ioread32(priv->regs + 0x100 + RIO_PORT_N_CTL_CSR(0, 0));
                attr->link_width = (rval & RIO_PORT_N_CTL_IPW) >> 27;
        } else
                attr->link_speed = RIO_LINK_DOWN;

#ifdef CONFIG_RAPIDIO_DMA_ENGINE
        attr->flags = RIO_MPORT_DMA | RIO_MPORT_DMA_SG;
        attr->dma_max_sge = 0;
        attr->dma_max_size = TSI721_BDMA_MAX_BCOUNT;
        attr->dma_align = 0;
#else
        attr->flags = 0;
#endif
        return 0;
}

/**
 * tsi721_disable_ints - disables all device interrupts
 * @priv: pointer to tsi721 private data
 */
static void tsi721_disable_ints(struct tsi721_device *priv)
{
        int ch;

        /* Disable all device level interrupts */
        iowrite32(0, priv->regs + TSI721_DEV_INTE);

        /* Disable all Device Channel interrupts */
        iowrite32(0, priv->regs + TSI721_DEV_CHAN_INTE);

        /* Disable all Inbound Msg Channel interrupts */
        for (ch = 0; ch < TSI721_IMSG_CHNUM; ch++)
                iowrite32(0, priv->regs + TSI721_IBDMAC_INTE(ch));

        /* Disable all Outbound Msg Channel interrupts */
        for (ch = 0; ch < TSI721_OMSG_CHNUM; ch++)
                iowrite32(0, priv->regs + TSI721_OBDMAC_INTE(ch));

        /* Disable all general messaging interrupts */
        iowrite32(0, priv->regs + TSI721_SMSG_INTE);

        /* Disable all BDMA Channel interrupts */
        for (ch = 0; ch < TSI721_DMA_MAXCH; ch++)
                iowrite32(0,
                        priv->regs + TSI721_DMAC_BASE(ch) + TSI721_DMAC_INTE);

        /* Disable all general BDMA interrupts */
        iowrite32(0, priv->regs + TSI721_BDMA_INTE);

        /* Disable all SRIO Channel interrupts */
        for (ch = 0; ch < TSI721_SRIO_MAXCH; ch++)
                iowrite32(0, priv->regs + TSI721_SR_CHINTE(ch));

        /* Disable all general SR2PC interrupts */
        iowrite32(0, priv->regs + TSI721_SR2PC_GEN_INTE);

        /* Disable all PC2SR interrupts */
        iowrite32(0, priv->regs + TSI721_PC2SR_INTE);

        /* Disable all I2C interrupts */
        iowrite32(0, priv->regs + TSI721_I2C_INT_ENABLE);

        /* Disable SRIO MAC interrupts */
        iowrite32(0, priv->regs + TSI721_RIO_EM_INT_ENABLE);
        iowrite32(0, priv->regs + TSI721_RIO_EM_DEV_INT_EN);
}

static struct rio_ops tsi721_rio_ops = {
        .lcread                 = tsi721_lcread,
        .lcwrite                = tsi721_lcwrite,
        .cread                  = tsi721_cread_dma,
        .cwrite                 = tsi721_cwrite_dma,
        .dsend                  = tsi721_dsend,
        .open_inb_mbox          = tsi721_open_inb_mbox,
        .close_inb_mbox         = tsi721_close_inb_mbox,
        .open_outb_mbox         = tsi721_open_outb_mbox,
        .close_outb_mbox        = tsi721_close_outb_mbox,
        .add_outb_message       = tsi721_add_outb_message,
        .add_inb_buffer         = tsi721_add_inb_buffer,
        .get_inb_message        = tsi721_get_inb_message,
        .map_inb                = tsi721_rio_map_inb_mem,
        .unmap_inb              = tsi721_rio_unmap_inb_mem,
        .pwenable               = tsi721_pw_enable,
        .query_mport            = tsi721_query_mport,
        .map_outb               = tsi721_map_outb_win,
        .unmap_outb             = tsi721_unmap_outb_win,
};

static void tsi721_mport_release(struct device *dev)
{
        struct rio_mport *mport = to_rio_mport(dev);

        tsi_debug(EXIT, dev, "%s id=%d", mport->name, mport->id);
}

/**
 * tsi721_setup_mport - Setup Tsi721 as RapidIO subsystem master port
 * @priv: pointer to tsi721 private data
 *
 * Configures Tsi721 as RapidIO master port.
 */
static int tsi721_setup_mport(struct tsi721_device *priv)
{
        struct pci_dev *pdev = priv->pdev;
        int err = 0;
        struct rio_mport *mport = &priv->mport;

        err = rio_mport_initialize(mport);
        if (err)
                return err;

        mport->ops = &tsi721_rio_ops;
        mport->index = 0;
        mport->sys_size = 0; /* small system */
        mport->priv = (void *)priv;
        mport->phys_efptr = 0x100;
        mport->phys_rmap = 1;
        mport->dev.parent = &pdev->dev;
        mport->dev.release = tsi721_mport_release;

        INIT_LIST_HEAD(&mport->dbells);

        rio_init_dbell_res(&mport->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff);
        rio_init_mbox_res(&mport->riores[RIO_INB_MBOX_RESOURCE], 0, 3);
        rio_init_mbox_res(&mport->riores[RIO_OUTB_MBOX_RESOURCE], 0, 3);
        snprintf(mport->name, RIO_MAX_MPORT_NAME, "%s(%s)",
                 dev_driver_string(&pdev->dev), dev_name(&pdev->dev));

        /* Hook up interrupt handler */

#ifdef CONFIG_PCI_MSI
        if (!tsi721_enable_msix(priv))
                priv->flags |= TSI721_USING_MSIX;
        else if (!pci_enable_msi(pdev))
                priv->flags |= TSI721_USING_MSI;
        else
                tsi_debug(MPORT, &pdev->dev,
                         "MSI/MSI-X is not available. Using legacy INTx.");
#endif /* CONFIG_PCI_MSI */

        err = tsi721_request_irq(priv);

        if (err) {
                tsi_err(&pdev->dev, "Unable to get PCI IRQ %02X (err=0x%x)",
                        pdev->irq, err);
                return err;
        }

#ifdef CONFIG_RAPIDIO_DMA_ENGINE
        err = tsi721_register_dma(priv);
        if (err)
                goto err_exit;
#endif
        /* Enable SRIO link */
        iowrite32(ioread32(priv->regs + TSI721_DEVCTL) |
                  TSI721_DEVCTL_SRBOOT_CMPL,
                  priv->regs + TSI721_DEVCTL);

        if (mport->host_deviceid >= 0)
                iowrite32(RIO_PORT_GEN_HOST | RIO_PORT_GEN_MASTER |
                          RIO_PORT_GEN_DISCOVERED,
                          priv->regs + (0x100 + RIO_PORT_GEN_CTL_CSR));
        else
                iowrite32(0, priv->regs + (0x100 + RIO_PORT_GEN_CTL_CSR));

        err = rio_register_mport(mport);
        if (err) {
                tsi721_unregister_dma(priv);
                goto err_exit;
        }

        return 0;

err_exit:
        tsi721_free_irq(priv);
        return err;
}

static int tsi721_probe(struct pci_dev *pdev,
                                  const struct pci_device_id *id)
{
        struct tsi721_device *priv;
        int err;

        priv = kzalloc(sizeof(struct tsi721_device), GFP_KERNEL);
        if (!priv) {
                err = -ENOMEM;
                goto err_exit;
        }

        err = pci_enable_device(pdev);
        if (err) {
                tsi_err(&pdev->dev, "Failed to enable PCI device");
                goto err_clean;
        }

        priv->pdev = pdev;

#ifdef DEBUG
        {
                int i;

                for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
                        tsi_debug(INIT, &pdev->dev, "res%d %pR",
                                  i, &pdev->resource[i]);
                }
        }
#endif
        /*
         * Verify BAR configuration
         */

        /* BAR_0 (registers) must be 512KB+ in 32-bit address space */
        if (!(pci_resource_flags(pdev, BAR_0) & IORESOURCE_MEM) ||
            pci_resource_flags(pdev, BAR_0) & IORESOURCE_MEM_64 ||
            pci_resource_len(pdev, BAR_0) < TSI721_REG_SPACE_SIZE) {
                tsi_err(&pdev->dev, "Missing or misconfigured CSR BAR0");
                err = -ENODEV;
                goto err_disable_pdev;
        }

        /* BAR_1 (outbound doorbells) must be 16MB+ in 32-bit address space */
        if (!(pci_resource_flags(pdev, BAR_1) & IORESOURCE_MEM) ||
            pci_resource_flags(pdev, BAR_1) & IORESOURCE_MEM_64 ||
            pci_resource_len(pdev, BAR_1) < TSI721_DB_WIN_SIZE) {
                tsi_err(&pdev->dev, "Missing or misconfigured Doorbell BAR1");
                err = -ENODEV;
                goto err_disable_pdev;
        }

        /*
         * BAR_2 and BAR_4 (outbound translation) must be in 64-bit PCIe address
         * space.
         * NOTE: BAR_2 and BAR_4 are not used by this version of driver.
         * It may be a good idea to keep them disabled using HW configuration
         * to save PCI memory space.
         */

        priv->p2r_bar[0].size = priv->p2r_bar[1].size = 0;

        if (pci_resource_flags(pdev, BAR_2) & IORESOURCE_MEM_64) {
                if (pci_resource_flags(pdev, BAR_2) & IORESOURCE_PREFETCH)
                        tsi_debug(INIT, &pdev->dev,
                                 "Prefetchable OBW BAR2 will not be used");
                else {
                        priv->p2r_bar[0].base = pci_resource_start(pdev, BAR_2);
                        priv->p2r_bar[0].size = pci_resource_len(pdev, BAR_2);
                }
        }

        if (pci_resource_flags(pdev, BAR_4) & IORESOURCE_MEM_64) {
                if (pci_resource_flags(pdev, BAR_4) & IORESOURCE_PREFETCH)
                        tsi_debug(INIT, &pdev->dev,
                                 "Prefetchable OBW BAR4 will not be used");
                else {
                        priv->p2r_bar[1].base = pci_resource_start(pdev, BAR_4);
                        priv->p2r_bar[1].size = pci_resource_len(pdev, BAR_4);
                }
        }

        err = pci_request_regions(pdev, DRV_NAME);
        if (err) {
                tsi_err(&pdev->dev, "Unable to obtain PCI resources");
                goto err_disable_pdev;
        }

        pci_set_master(pdev);

        priv->regs = pci_ioremap_bar(pdev, BAR_0);
        if (!priv->regs) {
                tsi_err(&pdev->dev, "Unable to map device registers space");
                err = -ENOMEM;
                goto err_free_res;
        }

        priv->odb_base = pci_ioremap_bar(pdev, BAR_1);
        if (!priv->odb_base) {
                tsi_err(&pdev->dev, "Unable to map outbound doorbells space");
                err = -ENOMEM;
                goto err_unmap_bars;
        }

        /* Configure DMA attributes. */
        if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
                err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
                if (err) {
                        tsi_err(&pdev->dev, "Unable to set DMA mask");
                        goto err_unmap_bars;
                }

                if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)))
                        tsi_info(&pdev->dev, "Unable to set consistent DMA mask");
        } else {
                err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
                if (err)
                        tsi_info(&pdev->dev, "Unable to set consistent DMA mask");
        }

        BUG_ON(!pci_is_pcie(pdev));

        /* Clear "no snoop" and "relaxed ordering" bits. */
        pcie_capability_clear_and_set_word(pdev, PCI_EXP_DEVCTL,
                PCI_EXP_DEVCTL_RELAX_EN | PCI_EXP_DEVCTL_NOSNOOP_EN, 0);

        /* Override PCIe Maximum Read Request Size setting if requested */
        if (pcie_mrrs >= 0) {
                if (pcie_mrrs <= 5)
                        pcie_capability_clear_and_set_word(pdev, PCI_EXP_DEVCTL,
                                        PCI_EXP_DEVCTL_READRQ, pcie_mrrs << 12);
                else
                        tsi_info(&pdev->dev,
                                 "Invalid MRRS override value %d", pcie_mrrs);
        }

        /* Set PCIe completion timeout to 1-10ms */
        pcie_capability_clear_and_set_word(pdev, PCI_EXP_DEVCTL2,
                                           PCI_EXP_DEVCTL2_COMP_TIMEOUT, 0x2);

        /*
         * FIXUP: correct offsets of MSI-X tables in the MSI-X Capability Block
         */
        pci_write_config_dword(pdev, TSI721_PCIECFG_EPCTL, 0x01);
        pci_write_config_dword(pdev, TSI721_PCIECFG_MSIXTBL,
                                                TSI721_MSIXTBL_OFFSET);
        pci_write_config_dword(pdev, TSI721_PCIECFG_MSIXPBA,
                                                TSI721_MSIXPBA_OFFSET);
        pci_write_config_dword(pdev, TSI721_PCIECFG_EPCTL, 0);
        /* End of FIXUP */

        tsi721_disable_ints(priv);

        tsi721_init_pc2sr_mapping(priv);
        tsi721_init_sr2pc_mapping(priv);

        if (tsi721_bdma_maint_init(priv)) {
                tsi_err(&pdev->dev, "BDMA initialization failed");
                err = -ENOMEM;
                goto err_unmap_bars;
        }

        err = tsi721_doorbell_init(priv);
        if (err)
                goto err_free_bdma;

        tsi721_port_write_init(priv);

        err = tsi721_messages_init(priv);
        if (err)
                goto err_free_consistent;

        err = tsi721_setup_mport(priv);
        if (err)
                goto err_free_consistent;

        pci_set_drvdata(pdev, priv);
        tsi721_interrupts_init(priv);

        return 0;

err_free_consistent:
        tsi721_port_write_free(priv);
        tsi721_doorbell_free(priv);
err_free_bdma:
        tsi721_bdma_maint_free(priv);
err_unmap_bars:
        if (priv->regs)
                iounmap(priv->regs);
        if (priv->odb_base)
                iounmap(priv->odb_base);
err_free_res:
        pci_release_regions(pdev);
        pci_clear_master(pdev);
err_disable_pdev:
        pci_disable_device(pdev);
err_clean:
        kfree(priv);
err_exit:
        return err;
}

static void tsi721_remove(struct pci_dev *pdev)
{
        struct tsi721_device *priv = pci_get_drvdata(pdev);

        tsi_debug(EXIT, &pdev->dev, "enter");

        tsi721_disable_ints(priv);
        tsi721_free_irq(priv);
        flush_scheduled_work();
        rio_unregister_mport(&priv->mport);

        tsi721_unregister_dma(priv);
        tsi721_bdma_maint_free(priv);
        tsi721_doorbell_free(priv);
        tsi721_port_write_free(priv);
        tsi721_close_sr2pc_mapping(priv);

        if (priv->regs)
                iounmap(priv->regs);
        if (priv->odb_base)
                iounmap(priv->odb_base);
#ifdef CONFIG_PCI_MSI
        if (priv->flags & TSI721_USING_MSIX)
                pci_disable_msix(priv->pdev);
        else if (priv->flags & TSI721_USING_MSI)
                pci_disable_msi(priv->pdev);
#endif
        pci_release_regions(pdev);
        pci_clear_master(pdev);
        pci_disable_device(pdev);
        pci_set_drvdata(pdev, NULL);
        kfree(priv);
        tsi_debug(EXIT, &pdev->dev, "exit");
}

static void tsi721_shutdown(struct pci_dev *pdev)
{
        struct tsi721_device *priv = pci_get_drvdata(pdev);

        tsi_debug(EXIT, &pdev->dev, "enter");

        tsi721_disable_ints(priv);
        tsi721_dma_stop_all(priv);
        pci_clear_master(pdev);
        pci_disable_device(pdev);
}

static const struct pci_device_id tsi721_pci_tbl[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_IDT, PCI_DEVICE_ID_TSI721) },
        { 0, }  /* terminate list */
};

MODULE_DEVICE_TABLE(pci, tsi721_pci_tbl);

static struct pci_driver tsi721_driver = {
        .name           = "tsi721",
        .id_table       = tsi721_pci_tbl,
        .probe          = tsi721_probe,
        .remove         = tsi721_remove,
        .shutdown       = tsi721_shutdown,
};

module_pci_driver(tsi721_driver);

MODULE_DESCRIPTION("IDT Tsi721 PCIExpress-to-SRIO bridge driver");