/*
 * Freescale MPC85xx/MPC86xx RapidIO support
 *
 * Copyright (C) 2007, 2008 Freescale Semiconductor, Inc.
 * Zhang Wei <wei.zhang@freescale.com>
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <mporter@kernel.crashing.org>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/rio.h>
#include <linux/rio_drv.h>
#include <linux/of_platform.h>
#include <linux/delay.h>

#include <asm/io.h>

/* RapidIO definition irq, which read from OF-tree */
#define IRQ_RIO_BELL(m)         (((struct rio_priv *)(m->priv))->bellirq)
#define IRQ_RIO_TX(m)           (((struct rio_priv *)(m->priv))->txirq)
#define IRQ_RIO_RX(m)           (((struct rio_priv *)(m->priv))->rxirq)

#define RIO_ATMU_REGS_OFFSET    0x10c00
#define RIO_P_MSG_REGS_OFFSET   0x11000
#define RIO_S_MSG_REGS_OFFSET   0x13000
#define RIO_ESCSR               0x158
#define RIO_CCSR                0x15c
#define RIO_ISR_AACR            0x10120
#define RIO_ISR_AACR_AA         0x1     /* Accept All ID */
#define RIO_MAINT_WIN_SIZE      0x400000
#define RIO_DBELL_WIN_SIZE      0x1000

#define RIO_MSG_OMR_MUI         0x00000002
#define RIO_MSG_OSR_TE          0x00000080
#define RIO_MSG_OSR_QOI         0x00000020
#define RIO_MSG_OSR_QFI         0x00000010
#define RIO_MSG_OSR_MUB         0x00000004
#define RIO_MSG_OSR_EOMI        0x00000002
#define RIO_MSG_OSR_QEI         0x00000001

#define RIO_MSG_IMR_MI          0x00000002
#define RIO_MSG_ISR_TE          0x00000080
#define RIO_MSG_ISR_QFI         0x00000010
#define RIO_MSG_ISR_DIQI        0x00000001

#define RIO_MSG_DESC_SIZE       32
#define RIO_MSG_BUFFER_SIZE     4096
#define RIO_MIN_TX_RING_SIZE    2
#define RIO_MAX_TX_RING_SIZE    2048
#define RIO_MIN_RX_RING_SIZE    2
#define RIO_MAX_RX_RING_SIZE    2048

#define DOORBELL_DMR_DI         0x00000002
#define DOORBELL_DSR_TE         0x00000080
#define DOORBELL_DSR_QFI        0x00000010
#define DOORBELL_DSR_DIQI       0x00000001
#define DOORBELL_TID_OFFSET     0x02
#define DOORBELL_SID_OFFSET     0x04
#define DOORBELL_INFO_OFFSET    0x06

#define DOORBELL_MESSAGE_SIZE   0x08
#define DBELL_SID(x)            (*(u16 *)(x + DOORBELL_SID_OFFSET))
#define DBELL_TID(x)            (*(u16 *)(x + DOORBELL_TID_OFFSET))
#define DBELL_INF(x)            (*(u16 *)(x + DOORBELL_INFO_OFFSET))

struct rio_atmu_regs {
        u32 rowtar;
        u32 rowtear;
        u32 rowbar;
        u32 pad2;
        u32 rowar;
        u32 pad3[3];
};

struct rio_msg_regs {
        u32 omr;
        u32 osr;
        u32 pad1;
        u32 odqdpar;
        u32 pad2;
        u32 osar;
        u32 odpr;
        u32 odatr;
        u32 odcr;
        u32 pad3;
        u32 odqepar;
        u32 pad4[13];
        u32 imr;
        u32 isr;
        u32 pad5;
        u32 ifqdpar;
        u32 pad6;
        u32 ifqepar;
        u32 pad7[226];
        u32 odmr;
        u32 odsr;
        u32 res0[4];
        u32 oddpr;
        u32 oddatr;
        u32 res1[3];
        u32 odretcr;
        u32 res2[12];
        u32 dmr;
        u32 dsr;
        u32 pad8;
        u32 dqdpar;
        u32 pad9;
        u32 dqepar;
        u32 pad10[26];
        u32 pwmr;
        u32 pwsr;
        u32 pad11;
        u32 pwqbar;
};

struct rio_tx_desc {
        u32 res1;
        u32 saddr;
        u32 dport;
        u32 dattr;
        u32 res2;
        u32 res3;
        u32 dwcnt;
        u32 res4;
};

struct rio_dbell_ring {
        void *virt;
        dma_addr_t phys;
};

struct rio_msg_tx_ring {
        void *virt;
        dma_addr_t phys;
        void *virt_buffer[RIO_MAX_TX_RING_SIZE];
        dma_addr_t phys_buffer[RIO_MAX_TX_RING_SIZE];
        int tx_slot;
        int size;
        void *dev_id;
};

struct rio_msg_rx_ring {
        void *virt;
        dma_addr_t phys;
        void *virt_buffer[RIO_MAX_RX_RING_SIZE];
        int rx_slot;
        int size;
        void *dev_id;
};

struct rio_priv {
        struct device *dev;
        void __iomem *regs_win;
        struct rio_atmu_regs __iomem *atmu_regs;
        struct rio_atmu_regs __iomem *maint_atmu_regs;
        struct rio_atmu_regs __iomem *dbell_atmu_regs;
        void __iomem *dbell_win;
        void __iomem *maint_win;
        struct rio_msg_regs __iomem *msg_regs;
        struct rio_dbell_ring dbell_ring;
        struct rio_msg_tx_ring msg_tx_ring;
        struct rio_msg_rx_ring msg_rx_ring;
        int bellirq;
        int txirq;
        int rxirq;
};

/**
 * fsl_rio_doorbell_send - Send a MPC85xx doorbell message
 * @mport: RapidIO master port info
 * @index: ID of RapidIO interface
 * @destid: Destination ID of target device
 * @data: 16-bit info field of RapidIO doorbell message
 *
 * Sends a MPC85xx doorbell message. Returns %0 on success or
 * %-EINVAL on failure.
 */
static int fsl_rio_doorbell_send(struct rio_mport *mport,
                                int index, u16 destid, u16 data)
{
        struct rio_priv *priv = mport->priv;
        pr_debug("fsl_doorbell_send: index %d destid %4.4x data %4.4x\n",
                 index, destid, data);
        switch (mport->phy_type) {
        case RIO_PHY_PARALLEL:
                out_be32(&priv->dbell_atmu_regs->rowtar, destid << 22);
                out_be16(priv->dbell_win, data);
                break;
        case RIO_PHY_SERIAL:
                /* In the serial version silicons, such as MPC8548, MPC8641,
                 * below operations is must be.
                 */
                out_be32(&priv->msg_regs->odmr, 0x00000000);
                out_be32(&priv->msg_regs->odretcr, 0x00000004);
                out_be32(&priv->msg_regs->oddpr, destid << 16);
                out_be32(&priv->msg_regs->oddatr, data);
                out_be32(&priv->msg_regs->odmr, 0x00000001);
                break;
        }

        return 0;
}

/**
 * fsl_local_config_read - Generate a MPC85xx local config space read
 * @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 MPC85xx local configuration space read. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int fsl_local_config_read(struct rio_mport *mport,
                                int index, u32 offset, int len, u32 *data)
{
        struct rio_priv *priv = mport->priv;
        pr_debug("fsl_local_config_read: index %d offset %8.8x\n", index,
                 offset);
        *data = in_be32(priv->regs_win + offset);

        return 0;
}

/**
 * fsl_local_config_write - Generate a MPC85xx local config space write
 * @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 MPC85xx local configuration space write. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int fsl_local_config_write(struct rio_mport *mport,
                                int index, u32 offset, int len, u32 data)
{
        struct rio_priv *priv = mport->priv;
        pr_debug
            ("fsl_local_config_write: index %d offset %8.8x data %8.8x\n",
             index, offset, data);
        out_be32(priv->regs_win + offset, data);

        return 0;
}

/**
 * fsl_rio_config_read - Generate a MPC85xx read maintenance transaction
 * @mport: RapidIO master port info
 * @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 MPC85xx read maintenance transaction. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int
fsl_rio_config_read(struct rio_mport *mport, int index, u16 destid,
                        u8 hopcount, u32 offset, int len, u32 *val)
{
        struct rio_priv *priv = mport->priv;
        u8 *data;

        pr_debug
            ("fsl_rio_config_read: index %d destid %d hopcount %d offset %8.8x len %d\n",
             index, destid, hopcount, offset, len);
        out_be32(&priv->maint_atmu_regs->rowtar,
                 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));

        data = (u8 *) priv->maint_win + offset;
        switch (len) {
        case 1:
                *val = in_8((u8 *) data);
                break;
        case 2:
                *val = in_be16((u16 *) data);
                break;
        default:
                *val = in_be32((u32 *) data);
                break;
        }

        return 0;
}

/**
 * fsl_rio_config_write - Generate a MPC85xx write maintenance transaction
 * @mport: RapidIO master port info
 * @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 an MPC85xx write maintenance transaction. Returns %0 on
 * success or %-EINVAL on failure.
 */
static int
fsl_rio_config_write(struct rio_mport *mport, int index, u16 destid,
                        u8 hopcount, u32 offset, int len, u32 val)
{
        struct rio_priv *priv = mport->priv;
        u8 *data;
        pr_debug
            ("fsl_rio_config_write: index %d destid %d hopcount %d offset %8.8x len %d val %8.8x\n",
             index, destid, hopcount, offset, len, val);
        out_be32(&priv->maint_atmu_regs->rowtar,
                 (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));

        data = (u8 *) priv->maint_win + offset;
        switch (len) {
        case 1:
                out_8((u8 *) data, val);
                break;
        case 2:
                out_be16((u16 *) data, val);
                break;
        default:
                out_be32((u32 *) data, val);
                break;
        }

        return 0;
}

/**
 * rio_hw_add_outb_message - Add message to the MPC85xx 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
 *
 * Adds the @buffer message to the MPC85xx outbound message queue. Returns
 * %0 on success or %-EINVAL on failure.
 */
int
rio_hw_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
                        void *buffer, size_t len)
{
        struct rio_priv *priv = mport->priv;
        u32 omr;
        struct rio_tx_desc *desc = (struct rio_tx_desc *)priv->msg_tx_ring.virt
                                        + priv->msg_tx_ring.tx_slot;
        int ret = 0;

        pr_debug
            ("RIO: rio_hw_add_outb_message(): destid %4.4x mbox %d buffer %8.8x len %8.8x\n",
             rdev->destid, mbox, (int)buffer, len);

        if ((len < 8) || (len > RIO_MAX_MSG_SIZE)) {
                ret = -EINVAL;
                goto out;
        }

        /* Copy and clear rest of buffer */
        memcpy(priv->msg_tx_ring.virt_buffer[priv->msg_tx_ring.tx_slot], buffer,
                        len);
        if (len < (RIO_MAX_MSG_SIZE - 4))
                memset(priv->msg_tx_ring.virt_buffer[priv->msg_tx_ring.tx_slot]
                                + len, 0, RIO_MAX_MSG_SIZE - len);

        switch (mport->phy_type) {
        case RIO_PHY_PARALLEL:
                /* Set mbox field for message */
                desc->dport = mbox & 0x3;

                /* Enable EOMI interrupt, set priority, and set destid */
                desc->dattr = 0x28000000 | (rdev->destid << 2);
                break;
        case RIO_PHY_SERIAL:
                /* Set mbox field for message, and set destid */
                desc->dport = (rdev->destid << 16) | (mbox & 0x3);

                /* Enable EOMI interrupt and priority */
                desc->dattr = 0x28000000;
                break;
        }

        /* Set transfer size aligned to next power of 2 (in double words) */
        desc->dwcnt = is_power_of_2(len) ? len : 1 << get_bitmask_order(len);

        /* Set snooping and source buffer address */
        desc->saddr = 0x00000004
                | priv->msg_tx_ring.phys_buffer[priv->msg_tx_ring.tx_slot];

        /* Increment enqueue pointer */
        omr = in_be32(&priv->msg_regs->omr);
        out_be32(&priv->msg_regs->omr, omr | RIO_MSG_OMR_MUI);

        /* Go to next descriptor */
        if (++priv->msg_tx_ring.tx_slot == priv->msg_tx_ring.size)
                priv->msg_tx_ring.tx_slot = 0;

      out:
        return ret;
}

EXPORT_SYMBOL_GPL(rio_hw_add_outb_message);

/**
 * fsl_rio_tx_handler - MPC85xx outbound message interrupt handler
 * @irq: Linux interrupt number
 * @dev_instance: Pointer to interrupt-specific data
 *
 * Handles outbound message interrupts. Executes a register outbound
 * mailbox event handler and acks the interrupt occurrence.
 */
static irqreturn_t
fsl_rio_tx_handler(int irq, void *dev_instance)
{
        int osr;
        struct rio_mport *port = (struct rio_mport *)dev_instance;
        struct rio_priv *priv = port->priv;

        osr = in_be32(&priv->msg_regs->osr);

        if (osr & RIO_MSG_OSR_TE) {
                pr_info("RIO: outbound message transmission error\n");
                out_be32(&priv->msg_regs->osr, RIO_MSG_OSR_TE);
                goto out;
        }

        if (osr & RIO_MSG_OSR_QOI) {
                pr_info("RIO: outbound message queue overflow\n");
                out_be32(&priv->msg_regs->osr, RIO_MSG_OSR_QOI);
                goto out;
        }

        if (osr & RIO_MSG_OSR_EOMI) {
                u32 dqp = in_be32(&priv->msg_regs->odqdpar);
                int slot = (dqp - priv->msg_tx_ring.phys) >> 5;
                port->outb_msg[0].mcback(port, priv->msg_tx_ring.dev_id, -1,
                                slot);

                /* Ack the end-of-message interrupt */
                out_be32(&priv->msg_regs->osr, RIO_MSG_OSR_EOMI);
        }

      out:
        return IRQ_HANDLED;
}

/**
 * rio_open_outb_mbox - Initialize MPC85xx outbound mailbox
 * @mport: Master port implementing the outbound message unit
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox to open
 * @entries: Number of entries in the outbound mailbox ring
 *
 * Initializes buffer ring, request the outbound message interrupt,
 * and enables the outbound message unit. Returns %0 on success and
 * %-EINVAL or %-ENOMEM on failure.
 */
int rio_open_outb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
{
        int i, j, rc = 0;
        struct rio_priv *priv = mport->priv;

        if ((entries < RIO_MIN_TX_RING_SIZE) ||
            (entries > RIO_MAX_TX_RING_SIZE) || (!is_power_of_2(entries))) {
                rc = -EINVAL;
                goto out;
        }

        /* Initialize shadow copy ring */
        priv->msg_tx_ring.dev_id = dev_id;
        priv->msg_tx_ring.size = entries;

        for (i = 0; i < priv->msg_tx_ring.size; i++) {
                priv->msg_tx_ring.virt_buffer[i] =
                        dma_alloc_coherent(priv->dev, RIO_MSG_BUFFER_SIZE,
                                &priv->msg_tx_ring.phys_buffer[i], GFP_KERNEL);
                if (!priv->msg_tx_ring.virt_buffer[i]) {
                        rc = -ENOMEM;
                        for (j = 0; j < priv->msg_tx_ring.size; j++)
                                if (priv->msg_tx_ring.virt_buffer[j])
                                        dma_free_coherent(priv->dev,
                                                        RIO_MSG_BUFFER_SIZE,
                                                        priv->msg_tx_ring.
                                                        virt_buffer[j],
                                                        priv->msg_tx_ring.
                                                        phys_buffer[j]);
                        goto out;
                }
        }

        /* Initialize outbound message descriptor ring */
        priv->msg_tx_ring.virt = dma_alloc_coherent(priv->dev,
                                priv->msg_tx_ring.size * RIO_MSG_DESC_SIZE,
                                &priv->msg_tx_ring.phys, GFP_KERNEL);
        if (!priv->msg_tx_ring.virt) {
                rc = -ENOMEM;
                goto out_dma;
        }
        memset(priv->msg_tx_ring.virt, 0,
                        priv->msg_tx_ring.size * RIO_MSG_DESC_SIZE);
        priv->msg_tx_ring.tx_slot = 0;

        /* Point dequeue/enqueue pointers at first entry in ring */
        out_be32(&priv->msg_regs->odqdpar, priv->msg_tx_ring.phys);
        out_be32(&priv->msg_regs->odqepar, priv->msg_tx_ring.phys);

        /* Configure for snooping */
        out_be32(&priv->msg_regs->osar, 0x00000004);

        /* Clear interrupt status */
        out_be32(&priv->msg_regs->osr, 0x000000b3);

        /* Hook up outbound message handler */
        rc = request_irq(IRQ_RIO_TX(mport), fsl_rio_tx_handler, 0,
                         "msg_tx", (void *)mport);
        if (rc < 0)
                goto out_irq;

        /*
         * Configure outbound message unit
         *      Snooping
         *      Interrupts (all enabled, except QEIE)
         *      Chaining mode
         *      Disable
         */
        out_be32(&priv->msg_regs->omr, 0x00100220);

        /* Set number of entries */
        out_be32(&priv->msg_regs->omr,
                 in_be32(&priv->msg_regs->omr) |
                 ((get_bitmask_order(entries) - 2) << 12));

        /* Now enable the unit */
        out_be32(&priv->msg_regs->omr, in_be32(&priv->msg_regs->omr) | 0x1);

      out:
        return rc;

      out_irq:
        dma_free_coherent(priv->dev,
                          priv->msg_tx_ring.size * RIO_MSG_DESC_SIZE,
                          priv->msg_tx_ring.virt, priv->msg_tx_ring.phys);

      out_dma:
        for (i = 0; i < priv->msg_tx_ring.size; i++)
                dma_free_coherent(priv->dev, RIO_MSG_BUFFER_SIZE,
                                  priv->msg_tx_ring.virt_buffer[i],
                                  priv->msg_tx_ring.phys_buffer[i]);

        return rc;
}

/**
 * rio_close_outb_mbox - Shut down MPC85xx outbound mailbox
 * @mport: Master port implementing the outbound message unit
 * @mbox: Mailbox to close
 *
 * Disables the outbound message unit, free all buffers, and
 * frees the outbound message interrupt.
 */
void rio_close_outb_mbox(struct rio_mport *mport, int mbox)
{
        struct rio_priv *priv = mport->priv;
        /* Disable inbound message unit */
        out_be32(&priv->msg_regs->omr, 0);

        /* Free ring */
        dma_free_coherent(priv->dev,
                          priv->msg_tx_ring.size * RIO_MSG_DESC_SIZE,
                          priv->msg_tx_ring.virt, priv->msg_tx_ring.phys);

        /* Free interrupt */
        free_irq(IRQ_RIO_TX(mport), (void *)mport);
}

/**
 * fsl_rio_rx_handler - MPC85xx inbound message interrupt handler
 * @irq: Linux interrupt number
 * @dev_instance: Pointer to interrupt-specific data
 *
 * Handles inbound message interrupts. Executes a registered inbound
 * mailbox event handler and acks the interrupt occurrence.
 */
static irqreturn_t
fsl_rio_rx_handler(int irq, void *dev_instance)
{
        int isr;
        struct rio_mport *port = (struct rio_mport *)dev_instance;
        struct rio_priv *priv = port->priv;

        isr = in_be32(&priv->msg_regs->isr);

        if (isr & RIO_MSG_ISR_TE) {
                pr_info("RIO: inbound message reception error\n");
                out_be32((void *)&priv->msg_regs->isr, RIO_MSG_ISR_TE);
                goto out;
        }

        /* XXX Need to check/dispatch until queue empty */
        if (isr & RIO_MSG_ISR_DIQI) {
                /*
                 * We implement *only* mailbox 0, but can receive messages
                 * for any mailbox/letter to that mailbox destination. So,
                 * make the callback with an unknown/invalid mailbox number
                 * argument.
                 */
                port->inb_msg[0].mcback(port, priv->msg_rx_ring.dev_id, -1, -1);

                /* Ack the queueing interrupt */
                out_be32(&priv->msg_regs->isr, RIO_MSG_ISR_DIQI);
        }

      out:
        return IRQ_HANDLED;
}

/**
 * rio_open_inb_mbox - Initialize MPC85xx inbound mailbox
 * @mport: Master port implementing the inbound message unit
 * @dev_id: Device specific pointer to pass on event
 * @mbox: Mailbox to open
 * @entries: Number of entries in the inbound mailbox ring
 *
 * Initializes buffer ring, request the inbound message interrupt,
 * and enables the inbound message unit. Returns %0 on success
 * and %-EINVAL or %-ENOMEM on failure.
 */
int rio_open_inb_mbox(struct rio_mport *mport, void *dev_id, int mbox, int entries)
{
        int i, rc = 0;
        struct rio_priv *priv = mport->priv;

        if ((entries < RIO_MIN_RX_RING_SIZE) ||
            (entries > RIO_MAX_RX_RING_SIZE) || (!is_power_of_2(entries))) {
                rc = -EINVAL;
                goto out;
        }

        /* Initialize client buffer ring */
        priv->msg_rx_ring.dev_id = dev_id;
        priv->msg_rx_ring.size = entries;
        priv->msg_rx_ring.rx_slot = 0;
        for (i = 0; i < priv->msg_rx_ring.size; i++)
                priv->msg_rx_ring.virt_buffer[i] = NULL;

        /* Initialize inbound message ring */
        priv->msg_rx_ring.virt = dma_alloc_coherent(priv->dev,
                                priv->msg_rx_ring.size * RIO_MAX_MSG_SIZE,
                                &priv->msg_rx_ring.phys, GFP_KERNEL);
        if (!priv->msg_rx_ring.virt) {
                rc = -ENOMEM;
                goto out;
        }

        /* Point dequeue/enqueue pointers at first entry in ring */
        out_be32(&priv->msg_regs->ifqdpar, (u32) priv->msg_rx_ring.phys);
        out_be32(&priv->msg_regs->ifqepar, (u32) priv->msg_rx_ring.phys);

        /* Clear interrupt status */
        out_be32(&priv->msg_regs->isr, 0x00000091);

        /* Hook up inbound message handler */
        rc = request_irq(IRQ_RIO_RX(mport), fsl_rio_rx_handler, 0,
                         "msg_rx", (void *)mport);
        if (rc < 0) {
                dma_free_coherent(priv->dev, RIO_MSG_BUFFER_SIZE,
                                  priv->msg_tx_ring.virt_buffer[i],
                                  priv->msg_tx_ring.phys_buffer[i]);
                goto out;
        }

        /*
         * Configure inbound message unit:
         *      Snooping
         *      4KB max message size
         *      Unmask all interrupt sources
         *      Disable
         */
        out_be32(&priv->msg_regs->imr, 0x001b0060);

        /* Set number of queue entries */
        setbits32(&priv->msg_regs->imr, (get_bitmask_order(entries) - 2) << 12);

        /* Now enable the unit */
        setbits32(&priv->msg_regs->imr, 0x1);

      out:
        return rc;
}

/**
 * rio_close_inb_mbox - Shut down MPC85xx inbound mailbox
 * @mport: Master port implementing the inbound message unit
 * @mbox: Mailbox to close
 *
 * Disables the inbound message unit, free all buffers, and
 * frees the inbound message interrupt.
 */
void rio_close_inb_mbox(struct rio_mport *mport, int mbox)
{
        struct rio_priv *priv = mport->priv;
        /* Disable inbound message unit */
        out_be32(&priv->msg_regs->imr, 0);

        /* Free ring */
        dma_free_coherent(priv->dev, priv->msg_rx_ring.size * RIO_MAX_MSG_SIZE,
                          priv->msg_rx_ring.virt, priv->msg_rx_ring.phys);

        /* Free interrupt */
        free_irq(IRQ_RIO_RX(mport), (void *)mport);
}

/**
 * rio_hw_add_inb_buffer - Add buffer to the MPC85xx inbound message queue
 * @mport: Master port implementing the inbound message unit
 * @mbox: Inbound mailbox number
 * @buf: Buffer to add to inbound queue
 *
 * Adds the @buf buffer to the MPC85xx inbound message queue. Returns
 * %0 on success or %-EINVAL on failure.
 */
int rio_hw_add_inb_buffer(struct rio_mport *mport, int mbox, void *buf)
{
        int rc = 0;
        struct rio_priv *priv = mport->priv;

        pr_debug("RIO: rio_hw_add_inb_buffer(), msg_rx_ring.rx_slot %d\n",
                 priv->msg_rx_ring.rx_slot);

        if (priv->msg_rx_ring.virt_buffer[priv->msg_rx_ring.rx_slot]) {
                printk(KERN_ERR
                       "RIO: error adding inbound buffer %d, buffer exists\n",
                       priv->msg_rx_ring.rx_slot);
                rc = -EINVAL;
                goto out;
        }

        priv->msg_rx_ring.virt_buffer[priv->msg_rx_ring.rx_slot] = buf;
        if (++priv->msg_rx_ring.rx_slot == priv->msg_rx_ring.size)
                priv->msg_rx_ring.rx_slot = 0;

      out:
        return rc;
}

EXPORT_SYMBOL_GPL(rio_hw_add_inb_buffer);

/**
 * rio_hw_get_inb_message - Fetch inbound message from the MPC85xx message unit
 * @mport: Master port implementing the inbound message unit
 * @mbox: Inbound mailbox number
 *
 * Gets the next available inbound message from the inbound message queue.
 * A pointer to the message is returned on success or NULL on failure.
 */
void *rio_hw_get_inb_message(struct rio_mport *mport, int mbox)
{
        struct rio_priv *priv = mport->priv;
        u32 phys_buf, virt_buf;
        void *buf = NULL;
        int buf_idx;

        phys_buf = in_be32(&priv->msg_regs->ifqdpar);

        /* If no more messages, then bail out */
        if (phys_buf == in_be32(&priv->msg_regs->ifqepar))
                goto out2;

        virt_buf = (u32) priv->msg_rx_ring.virt + (phys_buf
                                                - priv->msg_rx_ring.phys);
        buf_idx = (phys_buf - priv->msg_rx_ring.phys) / RIO_MAX_MSG_SIZE;
        buf = priv->msg_rx_ring.virt_buffer[buf_idx];

        if (!buf) {
                printk(KERN_ERR
                       "RIO: inbound message copy failed, no buffers\n");
                goto out1;
        }

        /* Copy max message size, caller is expected to allocate that big */
        memcpy(buf, (void *)virt_buf, RIO_MAX_MSG_SIZE);

        /* Clear the available buffer */
        priv->msg_rx_ring.virt_buffer[buf_idx] = NULL;

      out1:
        setbits32(&priv->msg_regs->imr, RIO_MSG_IMR_MI);

      out2:
        return buf;
}

EXPORT_SYMBOL_GPL(rio_hw_get_inb_message);

/**
 * fsl_rio_dbell_handler - MPC85xx doorbell interrupt handler
 * @irq: Linux interrupt number
 * @dev_instance: Pointer to interrupt-specific data
 *
 * Handles doorbell interrupts. Parses a list of registered
 * doorbell event handlers and executes a matching event handler.
 */
static irqreturn_t
fsl_rio_dbell_handler(int irq, void *dev_instance)
{
        int dsr;
        struct rio_mport *port = (struct rio_mport *)dev_instance;
        struct rio_priv *priv = port->priv;

        dsr = in_be32(&priv->msg_regs->dsr);

        if (dsr & DOORBELL_DSR_TE) {
                pr_info("RIO: doorbell reception error\n");
                out_be32(&priv->msg_regs->dsr, DOORBELL_DSR_TE);
                goto out;
        }

        if (dsr & DOORBELL_DSR_QFI) {
                pr_info("RIO: doorbell queue full\n");
                out_be32(&priv->msg_regs->dsr, DOORBELL_DSR_QFI);
                goto out;
        }

        /* XXX Need to check/dispatch until queue empty */
        if (dsr & DOORBELL_DSR_DIQI) {
                u32 dmsg =
                    (u32) priv->dbell_ring.virt +
                    (in_be32(&priv->msg_regs->dqdpar) & 0xfff);
                struct rio_dbell *dbell;
                int found = 0;

                pr_debug
                    ("RIO: processing doorbell, sid %2.2x tid %2.2x info %4.4x\n",
                     DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));

                list_for_each_entry(dbell, &port->dbells, node) {
                        if ((dbell->res->start <= DBELL_INF(dmsg)) &&
                            (dbell->res->end >= DBELL_INF(dmsg))) {
                                found = 1;
                                break;
                        }
                }
                if (found) {
                        dbell->dinb(port, dbell->dev_id, DBELL_SID(dmsg), DBELL_TID(dmsg),
                                    DBELL_INF(dmsg));
                } else {
                        pr_debug
                            ("RIO: spurious doorbell, sid %2.2x tid %2.2x info %4.4x\n",
                             DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
                }
                setbits32(&priv->msg_regs->dmr, DOORBELL_DMR_DI);
                out_be32(&priv->msg_regs->dsr, DOORBELL_DSR_DIQI);
        }

      out:
        return IRQ_HANDLED;
}

/**
 * fsl_rio_doorbell_init - MPC85xx doorbell interface init
 * @mport: Master port implementing the inbound doorbell unit
 *
 * Initializes doorbell unit hardware and inbound DMA buffer
 * ring. Called from fsl_rio_setup(). Returns %0 on success
 * or %-ENOMEM on failure.
 */
static int fsl_rio_doorbell_init(struct rio_mport *mport)
{
        struct rio_priv *priv = mport->priv;
        int rc = 0;

        /* Map outbound doorbell window immediately after maintenance window */
        priv->dbell_win = ioremap(mport->iores.start + RIO_MAINT_WIN_SIZE,
                            RIO_DBELL_WIN_SIZE);
        if (!priv->dbell_win) {
                printk(KERN_ERR
                       "RIO: unable to map outbound doorbell window\n");
                rc = -ENOMEM;
                goto out;
        }

        /* Initialize inbound doorbells */
        priv->dbell_ring.virt = dma_alloc_coherent(priv->dev, 512 *
                    DOORBELL_MESSAGE_SIZE, &priv->dbell_ring.phys, GFP_KERNEL);
        if (!priv->dbell_ring.virt) {
                printk(KERN_ERR "RIO: unable allocate inbound doorbell ring\n");
                rc = -ENOMEM;
                iounmap(priv->dbell_win);
                goto out;
        }

        /* Point dequeue/enqueue pointers at first entry in ring */
        out_be32(&priv->msg_regs->dqdpar, (u32) priv->dbell_ring.phys);
        out_be32(&priv->msg_regs->dqepar, (u32) priv->dbell_ring.phys);

        /* Clear interrupt status */
        out_be32(&priv->msg_regs->dsr, 0x00000091);

        /* Hook up doorbell handler */
        rc = request_irq(IRQ_RIO_BELL(mport), fsl_rio_dbell_handler, 0,
                         "dbell_rx", (void *)mport);
        if (rc < 0) {
                iounmap(priv->dbell_win);
                dma_free_coherent(priv->dev, 512 * DOORBELL_MESSAGE_SIZE,
                                  priv->dbell_ring.virt, priv->dbell_ring.phys);
                printk(KERN_ERR
                       "MPC85xx RIO: unable to request inbound doorbell irq");
                goto out;
        }

        /* Configure doorbells for snooping, 512 entries, and enable */
        out_be32(&priv->msg_regs->dmr, 0x00108161);

      out:
        return rc;
}

static char *cmdline = NULL;

static int fsl_rio_get_hdid(int index)
{
        /* XXX Need to parse multiple entries in some format */
        if (!cmdline)
                return -1;

        return simple_strtol(cmdline, NULL, 0);
}

static int fsl_rio_get_cmdline(char *s)
{
        if (!s)
                return 0;

        cmdline = s;
        return 1;
}

__setup("riohdid=", fsl_rio_get_cmdline);

static inline void fsl_rio_info(struct device *dev, u32 ccsr)
{
        const char *str;
        if (ccsr & 1) {
                /* Serial phy */
                switch (ccsr >> 30) {
                case 0:
                        str = "1";
                        break;
                case 1:
                        str = "4";
                        break;
                default:
                        str = "Unknown";
                        break;
                }
                dev_info(dev, "Hardware port width: %s\n", str);

                switch ((ccsr >> 27) & 7) {
                case 0:
                        str = "Single-lane 0";
                        break;
                case 1:
                        str = "Single-lane 2";
                        break;
                case 2:
                        str = "Four-lane";
                        break;
                default:
                        str = "Unknown";
                        break;
                }
                dev_info(dev, "Training connection status: %s\n", str);
        } else {
                /* Parallel phy */
                if (!(ccsr & 0x80000000))
                        dev_info(dev, "Output port operating in 8-bit mode\n");
                if (!(ccsr & 0x08000000))
                        dev_info(dev, "Input port operating in 8-bit mode\n");
        }
}

/**
 * fsl_rio_setup - Setup Freescale PowerPC RapidIO interface
 * @dev: of_device pointer
 *
 * Initializes MPC85xx RapidIO hardware interface, configures

 * master port with system-specific info, and registers the
 * master port with the RapidIO subsystem.
 */
int fsl_rio_setup(struct of_device *dev)
{
        struct rio_ops *ops;
        struct rio_mport *port;
        struct rio_priv *priv;
        int rc = 0;
        const u32 *dt_range, *cell;
        struct resource regs;
        int rlen;
        u32 ccsr;
        u64 law_start, law_size;
        int paw, aw, sw;

        if (!dev->node) {
                dev_err(&dev->dev, "Device OF-Node is NULL");
                return -EFAULT;
        }

        rc = of_address_to_resource(dev->node, 0, &regs);
        if (rc) {
                dev_err(&dev->dev, "Can't get %s property 'reg'\n",
                                dev->node->full_name);
                return -EFAULT;
        }
        dev_info(&dev->dev, "Of-device full name %s\n", dev->node->full_name);
        dev_info(&dev->dev, "Regs: %pR\n", &regs);

        dt_range = of_get_property(dev->node, "ranges", &rlen);
        if (!dt_range) {
                dev_err(&dev->dev, "Can't get %s property 'ranges'\n",
                                dev->node->full_name);
                return -EFAULT;
        }

        /* Get node address wide */
        cell = of_get_property(dev->node, "#address-cells", NULL);
        if (cell)
                aw = *cell;
        else
                aw = of_n_addr_cells(dev->node);
        /* Get node size wide */
        cell = of_get_property(dev->node, "#size-cells", NULL);
        if (cell)
                sw = *cell;
        else
                sw = of_n_size_cells(dev->node);
        /* Get parent address wide wide */
        paw = of_n_addr_cells(dev->node);

        law_start = of_read_number(dt_range + aw, paw);
        law_size = of_read_number(dt_range + aw + paw, sw);

        dev_info(&dev->dev, "LAW start 0x%016llx, size 0x%016llx.\n",
                        law_start, law_size);

        ops = kmalloc(sizeof(struct rio_ops), GFP_KERNEL);
        if (!ops) {
                rc = -ENOMEM;
                goto err_ops;
        }
        ops->lcread = fsl_local_config_read;
        ops->lcwrite = fsl_local_config_write;
        ops->cread = fsl_rio_config_read;
        ops->cwrite = fsl_rio_config_write;
        ops->dsend = fsl_rio_doorbell_send;

        port = kzalloc(sizeof(struct rio_mport), GFP_KERNEL);
        if (!port) {
                rc = -ENOMEM;
                goto err_port;
        }
        port->id = 0;
        port->index = 0;

        priv = kzalloc(sizeof(struct rio_priv), GFP_KERNEL);
        if (!priv) {
                printk(KERN_ERR "Can't alloc memory for 'priv'\n");
                rc = -ENOMEM;
                goto err_priv;
        }

        INIT_LIST_HEAD(&port->dbells);
        port->iores.start = law_start;
        port->iores.end = law_start + law_size - 1;
        port->iores.flags = IORESOURCE_MEM;
        port->iores.name = "rio_io_win";

        priv->bellirq = irq_of_parse_and_map(dev->node, 2);
        priv->txirq = irq_of_parse_and_map(dev->node, 3);
        priv->rxirq = irq_of_parse_and_map(dev->node, 4);
        dev_info(&dev->dev, "bellirq: %d, txirq: %d, rxirq %d\n", priv->bellirq,
                                priv->txirq, priv->rxirq);

        rio_init_dbell_res(&port->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff);
        rio_init_mbox_res(&port->riores[RIO_INB_MBOX_RESOURCE], 0, 0);
        rio_init_mbox_res(&port->riores[RIO_OUTB_MBOX_RESOURCE], 0, 0);
        strcpy(port->name, "RIO0 mport");

        priv->dev = &dev->dev;

        port->ops = ops;
        port->host_deviceid = fsl_rio_get_hdid(port->id);

        port->priv = priv;
        rio_register_mport(port);

        priv->regs_win = ioremap(regs.start, regs.end - regs.start + 1);

        /* Probe the master port phy type */
        ccsr = in_be32(priv->regs_win + RIO_CCSR);
        port->phy_type = (ccsr & 1) ? RIO_PHY_SERIAL : RIO_PHY_PARALLEL;
        dev_info(&dev->dev, "RapidIO PHY type: %s\n",
                        (port->phy_type == RIO_PHY_PARALLEL) ? "parallel" :
                        ((port->phy_type == RIO_PHY_SERIAL) ? "serial" :
                         "unknown"));
        /* Checking the port training status */
        if (in_be32((priv->regs_win + RIO_ESCSR)) & 1) {
                dev_err(&dev->dev, "Port is not ready. "
                                   "Try to restart connection...\n");
                switch (port->phy_type) {
                case RIO_PHY_SERIAL:
                        /* Disable ports */
                        out_be32(priv->regs_win + RIO_CCSR, 0);
                        /* Set 1x lane */
                        setbits32(priv->regs_win + RIO_CCSR, 0x02000000);
                        /* Enable ports */
                        setbits32(priv->regs_win + RIO_CCSR, 0x00600000);
                        break;
                case RIO_PHY_PARALLEL:
                        /* Disable ports */
                        out_be32(priv->regs_win + RIO_CCSR, 0x22000000);
                        /* Enable ports */
                        out_be32(priv->regs_win + RIO_CCSR, 0x44000000);
                        break;
                }
                msleep(100);
                if (in_be32((priv->regs_win + RIO_ESCSR)) & 1) {
                        dev_err(&dev->dev, "Port restart failed.\n");
                        rc = -ENOLINK;
                        goto err;
                }
                dev_info(&dev->dev, "Port restart success!\n");
        }
        fsl_rio_info(&dev->dev, ccsr);

        port->sys_size = (in_be32((priv->regs_win + RIO_PEF_CAR))
                                        & RIO_PEF_CTLS) >> 4;
        dev_info(&dev->dev, "RapidIO Common Transport System size: %d\n",
                        port->sys_size ? 65536 : 256);

        priv->atmu_regs = (struct rio_atmu_regs *)(priv->regs_win
                                        + RIO_ATMU_REGS_OFFSET);
        priv->maint_atmu_regs = priv->atmu_regs + 1;
        priv->dbell_atmu_regs = priv->atmu_regs + 2;
        priv->msg_regs = (struct rio_msg_regs *)(priv->regs_win +
                                ((port->phy_type == RIO_PHY_SERIAL) ?
                                RIO_S_MSG_REGS_OFFSET : RIO_P_MSG_REGS_OFFSET));

        /* Set to receive any dist ID for serial RapidIO controller. */
        if (port->phy_type == RIO_PHY_SERIAL)
                out_be32((priv->regs_win + RIO_ISR_AACR), RIO_ISR_AACR_AA);

        /* Configure maintenance transaction window */
        out_be32(&priv->maint_atmu_regs->rowbar, law_start >> 12);
        out_be32(&priv->maint_atmu_regs->rowar, 0x80077015);    /* 4M */

        priv->maint_win = ioremap(law_start, RIO_MAINT_WIN_SIZE);

        /* Configure outbound doorbell window */
        out_be32(&priv->dbell_atmu_regs->rowbar,
                        (law_start + RIO_MAINT_WIN_SIZE) >> 12);
        out_be32(&priv->dbell_atmu_regs->rowar, 0x8004200b);    /* 4k */
        fsl_rio_doorbell_init(port);

        return 0;
err:
        iounmap(priv->regs_win);
        kfree(priv);
err_priv:
        kfree(port);
err_port:
        kfree(ops);
err_ops:
        return rc;
}

/* The probe function for RapidIO peer-to-peer network.
 */
static int __devinit fsl_of_rio_rpn_probe(struct of_device *dev,
                                     const struct of_device_id *match)
{
        int rc;
        printk(KERN_INFO "Setting up RapidIO peer-to-peer network %s\n",
                        dev->node->full_name);

        rc = fsl_rio_setup(dev);
        if (rc)
                goto out;

        /* Enumerate all registered ports */
        rc = rio_init_mports();
out:
        return rc;
};

static const struct of_device_id fsl_of_rio_rpn_ids[] = {
        {
                .compatible = "fsl,rapidio-delta",
        },
        {},
};

static struct of_platform_driver fsl_of_rio_rpn_driver = {
        .name = "fsl-of-rio",
        .match_table = fsl_of_rio_rpn_ids,
        .probe = fsl_of_rio_rpn_probe,
};

static __init int fsl_of_rio_rpn_init(void)
{
        return of_register_platform_driver(&fsl_of_rio_rpn_driver);
}

subsys_initcall(fsl_of_rio_rpn_init);