/*
 * Support for the Tundra Universe I/II VME-PCI Bridge Chips
 *
 * Author: Martyn Welch <martyn.welch@ge.com>
 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
 *
 * Based on work by Tom Armistead and Ajit Prem
 * Copyright 2004 Motorola Inc.
 *
 * Derived from ca91c042.c by Michael Wyrick
 *
 * 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/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/poll.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/vme.h>

#include "../vme_bridge.h"
#include "vme_ca91cx42.h"

static int ca91cx42_probe(struct pci_dev *, const struct pci_device_id *);
static void ca91cx42_remove(struct pci_dev *);

/* Module parameters */
static int geoid;

static const char driver_name[] = "vme_ca91cx42";

static const struct pci_device_id ca91cx42_ids[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_TUNDRA, PCI_DEVICE_ID_TUNDRA_CA91C142) },
        { },
};

MODULE_DEVICE_TABLE(pci, ca91cx42_ids);

static struct pci_driver ca91cx42_driver = {
        .name = driver_name,
        .id_table = ca91cx42_ids,
        .probe = ca91cx42_probe,
        .remove = ca91cx42_remove,
};

static u32 ca91cx42_DMA_irqhandler(struct ca91cx42_driver *bridge)
{
        wake_up(&bridge->dma_queue);

        return CA91CX42_LINT_DMA;
}

static u32 ca91cx42_LM_irqhandler(struct ca91cx42_driver *bridge, u32 stat)
{
        int i;
        u32 serviced = 0;

        for (i = 0; i < 4; i++) {
                if (stat & CA91CX42_LINT_LM[i]) {
                        /* We only enable interrupts if the callback is set */
                        bridge->lm_callback[i](bridge->lm_data[i]);
                        serviced |= CA91CX42_LINT_LM[i];
                }
        }

        return serviced;
}

/* XXX This needs to be split into 4 queues */
static u32 ca91cx42_MB_irqhandler(struct ca91cx42_driver *bridge, int mbox_mask)
{
        wake_up(&bridge->mbox_queue);

        return CA91CX42_LINT_MBOX;
}

static u32 ca91cx42_IACK_irqhandler(struct ca91cx42_driver *bridge)
{
        wake_up(&bridge->iack_queue);

        return CA91CX42_LINT_SW_IACK;
}

static u32 ca91cx42_VERR_irqhandler(struct vme_bridge *ca91cx42_bridge)
{
        int val;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;

        val = ioread32(bridge->base + DGCS);

        if (!(val & 0x00000800)) {
                dev_err(ca91cx42_bridge->parent, "ca91cx42_VERR_irqhandler DMA "
                        "Read Error DGCS=%08X\n", val);
        }

        return CA91CX42_LINT_VERR;
}

static u32 ca91cx42_LERR_irqhandler(struct vme_bridge *ca91cx42_bridge)
{
        int val;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;

        val = ioread32(bridge->base + DGCS);

        if (!(val & 0x00000800))
                dev_err(ca91cx42_bridge->parent, "ca91cx42_LERR_irqhandler DMA "
                        "Read Error DGCS=%08X\n", val);

        return CA91CX42_LINT_LERR;
}


static u32 ca91cx42_VIRQ_irqhandler(struct vme_bridge *ca91cx42_bridge,
        int stat)
{
        int vec, i, serviced = 0;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;


        for (i = 7; i > 0; i--) {
                if (stat & (1 << i)) {
                        vec = ioread32(bridge->base +
                                CA91CX42_V_STATID[i]) & 0xff;

                        vme_irq_handler(ca91cx42_bridge, i, vec);

                        serviced |= (1 << i);
                }
        }

        return serviced;
}

static irqreturn_t ca91cx42_irqhandler(int irq, void *ptr)
{
        u32 stat, enable, serviced = 0;
        struct vme_bridge *ca91cx42_bridge;
        struct ca91cx42_driver *bridge;

        ca91cx42_bridge = ptr;

        bridge = ca91cx42_bridge->driver_priv;

        enable = ioread32(bridge->base + LINT_EN);
        stat = ioread32(bridge->base + LINT_STAT);

        /* Only look at unmasked interrupts */
        stat &= enable;

        if (unlikely(!stat))
                return IRQ_NONE;

        if (stat & CA91CX42_LINT_DMA)
                serviced |= ca91cx42_DMA_irqhandler(bridge);
        if (stat & (CA91CX42_LINT_LM0 | CA91CX42_LINT_LM1 | CA91CX42_LINT_LM2 |
                        CA91CX42_LINT_LM3))
                serviced |= ca91cx42_LM_irqhandler(bridge, stat);
        if (stat & CA91CX42_LINT_MBOX)
                serviced |= ca91cx42_MB_irqhandler(bridge, stat);
        if (stat & CA91CX42_LINT_SW_IACK)
                serviced |= ca91cx42_IACK_irqhandler(bridge);
        if (stat & CA91CX42_LINT_VERR)
                serviced |= ca91cx42_VERR_irqhandler(ca91cx42_bridge);
        if (stat & CA91CX42_LINT_LERR)
                serviced |= ca91cx42_LERR_irqhandler(ca91cx42_bridge);
        if (stat & (CA91CX42_LINT_VIRQ1 | CA91CX42_LINT_VIRQ2 |
                        CA91CX42_LINT_VIRQ3 | CA91CX42_LINT_VIRQ4 |
                        CA91CX42_LINT_VIRQ5 | CA91CX42_LINT_VIRQ6 |
                        CA91CX42_LINT_VIRQ7))
                serviced |= ca91cx42_VIRQ_irqhandler(ca91cx42_bridge, stat);

        /* Clear serviced interrupts */
        iowrite32(serviced, bridge->base + LINT_STAT);

        return IRQ_HANDLED;
}

static int ca91cx42_irq_init(struct vme_bridge *ca91cx42_bridge)
{
        int result, tmp;
        struct pci_dev *pdev;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;

        /* Need pdev */
        pdev = to_pci_dev(ca91cx42_bridge->parent);

        /* Disable interrupts from PCI to VME */
        iowrite32(0, bridge->base + VINT_EN);

        /* Disable PCI interrupts */
        iowrite32(0, bridge->base + LINT_EN);
        /* Clear Any Pending PCI Interrupts */
        iowrite32(0x00FFFFFF, bridge->base + LINT_STAT);

        result = request_irq(pdev->irq, ca91cx42_irqhandler, IRQF_SHARED,
                        driver_name, ca91cx42_bridge);
        if (result) {
                dev_err(&pdev->dev, "Can't get assigned pci irq vector %02X\n",
                       pdev->irq);
                return result;
        }

        /* Ensure all interrupts are mapped to PCI Interrupt 0 */
        iowrite32(0, bridge->base + LINT_MAP0);
        iowrite32(0, bridge->base + LINT_MAP1);
        iowrite32(0, bridge->base + LINT_MAP2);

        /* Enable DMA, mailbox & LM Interrupts */
        tmp = CA91CX42_LINT_MBOX3 | CA91CX42_LINT_MBOX2 | CA91CX42_LINT_MBOX1 |
                CA91CX42_LINT_MBOX0 | CA91CX42_LINT_SW_IACK |
                CA91CX42_LINT_VERR | CA91CX42_LINT_LERR | CA91CX42_LINT_DMA;

        iowrite32(tmp, bridge->base + LINT_EN);

        return 0;
}

static void ca91cx42_irq_exit(struct ca91cx42_driver *bridge,
        struct pci_dev *pdev)
{
        struct vme_bridge *ca91cx42_bridge;

        /* Disable interrupts from PCI to VME */
        iowrite32(0, bridge->base + VINT_EN);

        /* Disable PCI interrupts */
        iowrite32(0, bridge->base + LINT_EN);
        /* Clear Any Pending PCI Interrupts */
        iowrite32(0x00FFFFFF, bridge->base + LINT_STAT);

        ca91cx42_bridge = container_of((void *)bridge, struct vme_bridge,
                                       driver_priv);
        free_irq(pdev->irq, ca91cx42_bridge);
}

static int ca91cx42_iack_received(struct ca91cx42_driver *bridge, int level)
{
        u32 tmp;

        tmp = ioread32(bridge->base + LINT_STAT);

        if (tmp & (1 << level))
                return 0;
        else
                return 1;
}

/*
 * Set up an VME interrupt
 */
static void ca91cx42_irq_set(struct vme_bridge *ca91cx42_bridge, int level,
        int state, int sync)

{
        struct pci_dev *pdev;
        u32 tmp;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;

        /* Enable IRQ level */
        tmp = ioread32(bridge->base + LINT_EN);

        if (state == 0)
                tmp &= ~CA91CX42_LINT_VIRQ[level];
        else
                tmp |= CA91CX42_LINT_VIRQ[level];

        iowrite32(tmp, bridge->base + LINT_EN);

        if ((state == 0) && (sync != 0)) {
                pdev = to_pci_dev(ca91cx42_bridge->parent);

                synchronize_irq(pdev->irq);
        }
}

static int ca91cx42_irq_generate(struct vme_bridge *ca91cx42_bridge, int level,
        int statid)
{
        u32 tmp;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;

        /* Universe can only generate even vectors */
        if (statid & 1)
                return -EINVAL;

        mutex_lock(&bridge->vme_int);

        tmp = ioread32(bridge->base + VINT_EN);

        /* Set Status/ID */
        iowrite32(statid << 24, bridge->base + STATID);

        /* Assert VMEbus IRQ */
        tmp = tmp | (1 << (level + 24));
        iowrite32(tmp, bridge->base + VINT_EN);

        /* Wait for IACK */
        wait_event_interruptible(bridge->iack_queue,
                                 ca91cx42_iack_received(bridge, level));

        /* Return interrupt to low state */
        tmp = ioread32(bridge->base + VINT_EN);
        tmp = tmp & ~(1 << (level + 24));
        iowrite32(tmp, bridge->base + VINT_EN);

        mutex_unlock(&bridge->vme_int);

        return 0;
}

static int ca91cx42_slave_set(struct vme_slave_resource *image, int enabled,
        unsigned long long vme_base, unsigned long long size,
        dma_addr_t pci_base, u32 aspace, u32 cycle)
{
        unsigned int i, addr = 0, granularity;
        unsigned int temp_ctl = 0;
        unsigned int vme_bound, pci_offset;
        struct vme_bridge *ca91cx42_bridge;
        struct ca91cx42_driver *bridge;

        ca91cx42_bridge = image->parent;

        bridge = ca91cx42_bridge->driver_priv;

        i = image->number;

        switch (aspace) {
        case VME_A16:
                addr |= CA91CX42_VSI_CTL_VAS_A16;
                break;
        case VME_A24:
                addr |= CA91CX42_VSI_CTL_VAS_A24;
                break;
        case VME_A32:
                addr |= CA91CX42_VSI_CTL_VAS_A32;
                break;
        case VME_USER1:
                addr |= CA91CX42_VSI_CTL_VAS_USER1;
                break;
        case VME_USER2:
                addr |= CA91CX42_VSI_CTL_VAS_USER2;
                break;
        case VME_A64:
        case VME_CRCSR:
        case VME_USER3:
        case VME_USER4:
        default:
                dev_err(ca91cx42_bridge->parent, "Invalid address space\n");
                return -EINVAL;
                break;
        }

        /*
         * Bound address is a valid address for the window, adjust
         * accordingly
         */
        vme_bound = vme_base + size;
        pci_offset = pci_base - vme_base;

        if ((i == 0) || (i == 4))
                granularity = 0x1000;
        else
                granularity = 0x10000;

        if (vme_base & (granularity - 1)) {
                dev_err(ca91cx42_bridge->parent, "Invalid VME base "
                        "alignment\n");
                return -EINVAL;
        }
        if (vme_bound & (granularity - 1)) {
                dev_err(ca91cx42_bridge->parent, "Invalid VME bound "
                        "alignment\n");
                return -EINVAL;
        }
        if (pci_offset & (granularity - 1)) {
                dev_err(ca91cx42_bridge->parent, "Invalid PCI Offset "
                        "alignment\n");
                return -EINVAL;
        }

        /* Disable while we are mucking around */
        temp_ctl = ioread32(bridge->base + CA91CX42_VSI_CTL[i]);
        temp_ctl &= ~CA91CX42_VSI_CTL_EN;
        iowrite32(temp_ctl, bridge->base + CA91CX42_VSI_CTL[i]);

        /* Setup mapping */
        iowrite32(vme_base, bridge->base + CA91CX42_VSI_BS[i]);
        iowrite32(vme_bound, bridge->base + CA91CX42_VSI_BD[i]);
        iowrite32(pci_offset, bridge->base + CA91CX42_VSI_TO[i]);

        /* Setup address space */
        temp_ctl &= ~CA91CX42_VSI_CTL_VAS_M;
        temp_ctl |= addr;

        /* Setup cycle types */
        temp_ctl &= ~(CA91CX42_VSI_CTL_PGM_M | CA91CX42_VSI_CTL_SUPER_M);
        if (cycle & VME_SUPER)
                temp_ctl |= CA91CX42_VSI_CTL_SUPER_SUPR;
        if (cycle & VME_USER)
                temp_ctl |= CA91CX42_VSI_CTL_SUPER_NPRIV;
        if (cycle & VME_PROG)
                temp_ctl |= CA91CX42_VSI_CTL_PGM_PGM;
        if (cycle & VME_DATA)
                temp_ctl |= CA91CX42_VSI_CTL_PGM_DATA;

        /* Write ctl reg without enable */
        iowrite32(temp_ctl, bridge->base + CA91CX42_VSI_CTL[i]);

        if (enabled)
                temp_ctl |= CA91CX42_VSI_CTL_EN;

        iowrite32(temp_ctl, bridge->base + CA91CX42_VSI_CTL[i]);

        return 0;
}

static int ca91cx42_slave_get(struct vme_slave_resource *image, int *enabled,
        unsigned long long *vme_base, unsigned long long *size,
        dma_addr_t *pci_base, u32 *aspace, u32 *cycle)
{
        unsigned int i, granularity = 0, ctl = 0;
        unsigned long long vme_bound, pci_offset;
        struct ca91cx42_driver *bridge;

        bridge = image->parent->driver_priv;

        i = image->number;

        if ((i == 0) || (i == 4))
                granularity = 0x1000;
        else
                granularity = 0x10000;

        /* Read Registers */
        ctl = ioread32(bridge->base + CA91CX42_VSI_CTL[i]);

        *vme_base = ioread32(bridge->base + CA91CX42_VSI_BS[i]);
        vme_bound = ioread32(bridge->base + CA91CX42_VSI_BD[i]);
        pci_offset = ioread32(bridge->base + CA91CX42_VSI_TO[i]);

        *pci_base = (dma_addr_t)*vme_base + pci_offset;
        *size = (unsigned long long)((vme_bound - *vme_base) + granularity);

        *enabled = 0;
        *aspace = 0;
        *cycle = 0;

        if (ctl & CA91CX42_VSI_CTL_EN)
                *enabled = 1;

        if ((ctl & CA91CX42_VSI_CTL_VAS_M) == CA91CX42_VSI_CTL_VAS_A16)
                *aspace = VME_A16;
        if ((ctl & CA91CX42_VSI_CTL_VAS_M) == CA91CX42_VSI_CTL_VAS_A24)
                *aspace = VME_A24;
        if ((ctl & CA91CX42_VSI_CTL_VAS_M) == CA91CX42_VSI_CTL_VAS_A32)
                *aspace = VME_A32;
        if ((ctl & CA91CX42_VSI_CTL_VAS_M) == CA91CX42_VSI_CTL_VAS_USER1)
                *aspace = VME_USER1;
        if ((ctl & CA91CX42_VSI_CTL_VAS_M) == CA91CX42_VSI_CTL_VAS_USER2)
                *aspace = VME_USER2;

        if (ctl & CA91CX42_VSI_CTL_SUPER_SUPR)
                *cycle |= VME_SUPER;
        if (ctl & CA91CX42_VSI_CTL_SUPER_NPRIV)
                *cycle |= VME_USER;
        if (ctl & CA91CX42_VSI_CTL_PGM_PGM)
                *cycle |= VME_PROG;
        if (ctl & CA91CX42_VSI_CTL_PGM_DATA)
                *cycle |= VME_DATA;

        return 0;
}

/*
 * Allocate and map PCI Resource
 */
static int ca91cx42_alloc_resource(struct vme_master_resource *image,
        unsigned long long size)
{
        unsigned long long existing_size;
        int retval = 0;
        struct pci_dev *pdev;
        struct vme_bridge *ca91cx42_bridge;

        ca91cx42_bridge = image->parent;

        /* Find pci_dev container of dev */
        if (!ca91cx42_bridge->parent) {
                dev_err(ca91cx42_bridge->parent, "Dev entry NULL\n");
                return -EINVAL;
        }
        pdev = to_pci_dev(ca91cx42_bridge->parent);

        existing_size = (unsigned long long)(image->bus_resource.end -
                image->bus_resource.start);

        /* If the existing size is OK, return */
        if (existing_size == (size - 1))
                return 0;

        if (existing_size != 0) {
                iounmap(image->kern_base);
                image->kern_base = NULL;
                kfree(image->bus_resource.name);
                release_resource(&image->bus_resource);
                memset(&image->bus_resource, 0, sizeof(image->bus_resource));
        }

        if (!image->bus_resource.name) {
                image->bus_resource.name = kmalloc(VMENAMSIZ+3, GFP_ATOMIC);
                if (!image->bus_resource.name) {
                        retval = -ENOMEM;
                        goto err_name;
                }
        }

        sprintf((char *)image->bus_resource.name, "%s.%d",
                ca91cx42_bridge->name, image->number);

        image->bus_resource.start = 0;
        image->bus_resource.end = (unsigned long)size;
        image->bus_resource.flags = IORESOURCE_MEM;

        retval = pci_bus_alloc_resource(pdev->bus,
                &image->bus_resource, size, 0x10000, PCIBIOS_MIN_MEM,
                0, NULL, NULL);
        if (retval) {
                dev_err(ca91cx42_bridge->parent, "Failed to allocate mem "
                        "resource for window %d size 0x%lx start 0x%lx\n",
                        image->number, (unsigned long)size,
                        (unsigned long)image->bus_resource.start);
                goto err_resource;
        }

        image->kern_base = ioremap_nocache(
                image->bus_resource.start, size);
        if (!image->kern_base) {
                dev_err(ca91cx42_bridge->parent, "Failed to remap resource\n");
                retval = -ENOMEM;
                goto err_remap;
        }

        return 0;

err_remap:
        release_resource(&image->bus_resource);
err_resource:
        kfree(image->bus_resource.name);
        memset(&image->bus_resource, 0, sizeof(image->bus_resource));
err_name:
        return retval;
}

/*
 * Free and unmap PCI Resource
 */
static void ca91cx42_free_resource(struct vme_master_resource *image)
{
        iounmap(image->kern_base);
        image->kern_base = NULL;
        release_resource(&image->bus_resource);
        kfree(image->bus_resource.name);
        memset(&image->bus_resource, 0, sizeof(image->bus_resource));
}


static int ca91cx42_master_set(struct vme_master_resource *image, int enabled,
        unsigned long long vme_base, unsigned long long size, u32 aspace,
        u32 cycle, u32 dwidth)
{
        int retval = 0;
        unsigned int i, granularity = 0;
        unsigned int temp_ctl = 0;
        unsigned long long pci_bound, vme_offset, pci_base;
        struct vme_bridge *ca91cx42_bridge;
        struct ca91cx42_driver *bridge;

        ca91cx42_bridge = image->parent;

        bridge = ca91cx42_bridge->driver_priv;

        i = image->number;

        if ((i == 0) || (i == 4))
                granularity = 0x1000;
        else
                granularity = 0x10000;

        /* Verify input data */
        if (vme_base & (granularity - 1)) {
                dev_err(ca91cx42_bridge->parent, "Invalid VME Window "
                        "alignment\n");
                retval = -EINVAL;
                goto err_window;
        }
        if (size & (granularity - 1)) {
                dev_err(ca91cx42_bridge->parent, "Invalid VME Window "
                        "alignment\n");
                retval = -EINVAL;
                goto err_window;
        }

        spin_lock(&image->lock);

        /*
         * Let's allocate the resource here rather than further up the stack as
         * it avoids pushing loads of bus dependent stuff up the stack
         */
        retval = ca91cx42_alloc_resource(image, size);
        if (retval) {
                spin_unlock(&image->lock);
                dev_err(ca91cx42_bridge->parent, "Unable to allocate memory "
                        "for resource name\n");
                retval = -ENOMEM;
                goto err_res;
        }

        pci_base = (unsigned long long)image->bus_resource.start;

        /*
         * Bound address is a valid address for the window, adjust
         * according to window granularity.
         */
        pci_bound = pci_base + size;
        vme_offset = vme_base - pci_base;

        /* Disable while we are mucking around */
        temp_ctl = ioread32(bridge->base + CA91CX42_LSI_CTL[i]);
        temp_ctl &= ~CA91CX42_LSI_CTL_EN;
        iowrite32(temp_ctl, bridge->base + CA91CX42_LSI_CTL[i]);

        /* Setup cycle types */
        temp_ctl &= ~CA91CX42_LSI_CTL_VCT_M;
        if (cycle & VME_BLT)
                temp_ctl |= CA91CX42_LSI_CTL_VCT_BLT;
        if (cycle & VME_MBLT)
                temp_ctl |= CA91CX42_LSI_CTL_VCT_MBLT;

        /* Setup data width */
        temp_ctl &= ~CA91CX42_LSI_CTL_VDW_M;
        switch (dwidth) {
        case VME_D8:
                temp_ctl |= CA91CX42_LSI_CTL_VDW_D8;
                break;
        case VME_D16:
                temp_ctl |= CA91CX42_LSI_CTL_VDW_D16;
                break;
        case VME_D32:
                temp_ctl |= CA91CX42_LSI_CTL_VDW_D32;
                break;
        case VME_D64:
                temp_ctl |= CA91CX42_LSI_CTL_VDW_D64;
                break;
        default:
                spin_unlock(&image->lock);
                dev_err(ca91cx42_bridge->parent, "Invalid data width\n");
                retval = -EINVAL;
                goto err_dwidth;
                break;
        }

        /* Setup address space */
        temp_ctl &= ~CA91CX42_LSI_CTL_VAS_M;
        switch (aspace) {
        case VME_A16:
                temp_ctl |= CA91CX42_LSI_CTL_VAS_A16;
                break;
        case VME_A24:
                temp_ctl |= CA91CX42_LSI_CTL_VAS_A24;
                break;
        case VME_A32:
                temp_ctl |= CA91CX42_LSI_CTL_VAS_A32;
                break;
        case VME_CRCSR:
                temp_ctl |= CA91CX42_LSI_CTL_VAS_CRCSR;
                break;
        case VME_USER1:
                temp_ctl |= CA91CX42_LSI_CTL_VAS_USER1;
                break;
        case VME_USER2:
                temp_ctl |= CA91CX42_LSI_CTL_VAS_USER2;
                break;
        case VME_A64:
        case VME_USER3:
        case VME_USER4:
        default:
                spin_unlock(&image->lock);
                dev_err(ca91cx42_bridge->parent, "Invalid address space\n");
                retval = -EINVAL;
                goto err_aspace;
                break;
        }

        temp_ctl &= ~(CA91CX42_LSI_CTL_PGM_M | CA91CX42_LSI_CTL_SUPER_M);
        if (cycle & VME_SUPER)
                temp_ctl |= CA91CX42_LSI_CTL_SUPER_SUPR;
        if (cycle & VME_PROG)
                temp_ctl |= CA91CX42_LSI_CTL_PGM_PGM;

        /* Setup mapping */
        iowrite32(pci_base, bridge->base + CA91CX42_LSI_BS[i]);
        iowrite32(pci_bound, bridge->base + CA91CX42_LSI_BD[i]);
        iowrite32(vme_offset, bridge->base + CA91CX42_LSI_TO[i]);

        /* Write ctl reg without enable */
        iowrite32(temp_ctl, bridge->base + CA91CX42_LSI_CTL[i]);

        if (enabled)
                temp_ctl |= CA91CX42_LSI_CTL_EN;

        iowrite32(temp_ctl, bridge->base + CA91CX42_LSI_CTL[i]);

        spin_unlock(&image->lock);
        return 0;

err_aspace:
err_dwidth:
        ca91cx42_free_resource(image);
err_res:
err_window:
        return retval;
}

static int __ca91cx42_master_get(struct vme_master_resource *image,
        int *enabled, unsigned long long *vme_base, unsigned long long *size,
        u32 *aspace, u32 *cycle, u32 *dwidth)
{
        unsigned int i, ctl;
        unsigned long long pci_base, pci_bound, vme_offset;
        struct ca91cx42_driver *bridge;

        bridge = image->parent->driver_priv;

        i = image->number;

        ctl = ioread32(bridge->base + CA91CX42_LSI_CTL[i]);

        pci_base = ioread32(bridge->base + CA91CX42_LSI_BS[i]);
        vme_offset = ioread32(bridge->base + CA91CX42_LSI_TO[i]);
        pci_bound = ioread32(bridge->base + CA91CX42_LSI_BD[i]);

        *vme_base = pci_base + vme_offset;
        *size = (unsigned long long)(pci_bound - pci_base);

        *enabled = 0;
        *aspace = 0;
        *cycle = 0;
        *dwidth = 0;

        if (ctl & CA91CX42_LSI_CTL_EN)
                *enabled = 1;

        /* Setup address space */
        switch (ctl & CA91CX42_LSI_CTL_VAS_M) {
        case CA91CX42_LSI_CTL_VAS_A16:
                *aspace = VME_A16;
                break;
        case CA91CX42_LSI_CTL_VAS_A24:
                *aspace = VME_A24;
                break;
        case CA91CX42_LSI_CTL_VAS_A32:
                *aspace = VME_A32;
                break;
        case CA91CX42_LSI_CTL_VAS_CRCSR:
                *aspace = VME_CRCSR;
                break;
        case CA91CX42_LSI_CTL_VAS_USER1:
                *aspace = VME_USER1;
                break;
        case CA91CX42_LSI_CTL_VAS_USER2:
                *aspace = VME_USER2;
                break;
        }

        /* XXX Not sure howto check for MBLT */
        /* Setup cycle types */
        if (ctl & CA91CX42_LSI_CTL_VCT_BLT)
                *cycle |= VME_BLT;
        else
                *cycle |= VME_SCT;

        if (ctl & CA91CX42_LSI_CTL_SUPER_SUPR)
                *cycle |= VME_SUPER;
        else
                *cycle |= VME_USER;

        if (ctl & CA91CX42_LSI_CTL_PGM_PGM)
                *cycle = VME_PROG;
        else
                *cycle = VME_DATA;

        /* Setup data width */
        switch (ctl & CA91CX42_LSI_CTL_VDW_M) {
        case CA91CX42_LSI_CTL_VDW_D8:
                *dwidth = VME_D8;
                break;
        case CA91CX42_LSI_CTL_VDW_D16:
                *dwidth = VME_D16;
                break;
        case CA91CX42_LSI_CTL_VDW_D32:
                *dwidth = VME_D32;
                break;
        case CA91CX42_LSI_CTL_VDW_D64:
                *dwidth = VME_D64;
                break;
        }

        return 0;
}

static int ca91cx42_master_get(struct vme_master_resource *image, int *enabled,
        unsigned long long *vme_base, unsigned long long *size, u32 *aspace,
        u32 *cycle, u32 *dwidth)
{
        int retval;

        spin_lock(&image->lock);

        retval = __ca91cx42_master_get(image, enabled, vme_base, size, aspace,
                cycle, dwidth);

        spin_unlock(&image->lock);

        return retval;
}

static ssize_t ca91cx42_master_read(struct vme_master_resource *image,
        void *buf, size_t count, loff_t offset)
{
        ssize_t retval;
        void __iomem *addr = image->kern_base + offset;
        unsigned int done = 0;
        unsigned int count32;

        if (count == 0)
                return 0;

        spin_lock(&image->lock);

        /* The following code handles VME address alignment. We cannot use
         * memcpy_xxx here because it may cut data transfers in to 8-bit
         * cycles when D16 or D32 cycles are required on the VME bus.
         * On the other hand, the bridge itself assures that the maximum data
         * cycle configured for the transfer is used and splits it
         * automatically for non-aligned addresses, so we don't want the
         * overhead of needlessly forcing small transfers for the entire cycle.
         */
        if ((uintptr_t)addr & 0x1) {
                *(u8 *)buf = ioread8(addr);
                done += 1;
                if (done == count)
                        goto out;
        }
        if ((uintptr_t)(addr + done) & 0x2) {
                if ((count - done) < 2) {
                        *(u8 *)(buf + done) = ioread8(addr + done);
                        done += 1;
                        goto out;
                } else {
                        *(u16 *)(buf + done) = ioread16(addr + done);
                        done += 2;
                }
        }

        count32 = (count - done) & ~0x3;
        while (done < count32) {
                *(u32 *)(buf + done) = ioread32(addr + done);
                done += 4;
        }

        if ((count - done) & 0x2) {
                *(u16 *)(buf + done) = ioread16(addr + done);
                done += 2;
        }
        if ((count - done) & 0x1) {
                *(u8 *)(buf + done) = ioread8(addr + done);
                done += 1;
        }
out:
        retval = count;
        spin_unlock(&image->lock);

        return retval;
}

static ssize_t ca91cx42_master_write(struct vme_master_resource *image,
        void *buf, size_t count, loff_t offset)
{
        ssize_t retval;
        void __iomem *addr = image->kern_base + offset;
        unsigned int done = 0;
        unsigned int count32;

        if (count == 0)
                return 0;

        spin_lock(&image->lock);

        /* Here we apply for the same strategy we do in master_read
         * function in order to assure the correct cycles.
         */
        if ((uintptr_t)addr & 0x1) {
                iowrite8(*(u8 *)buf, addr);
                done += 1;
                if (done == count)
                        goto out;
        }
        if ((uintptr_t)(addr + done) & 0x2) {
                if ((count - done) < 2) {
                        iowrite8(*(u8 *)(buf + done), addr + done);
                        done += 1;
                        goto out;
                } else {
                        iowrite16(*(u16 *)(buf + done), addr + done);
                        done += 2;
                }
        }

        count32 = (count - done) & ~0x3;
        while (done < count32) {
                iowrite32(*(u32 *)(buf + done), addr + done);
                done += 4;
        }

        if ((count - done) & 0x2) {
                iowrite16(*(u16 *)(buf + done), addr + done);
                done += 2;
        }
        if ((count - done) & 0x1) {
                iowrite8(*(u8 *)(buf + done), addr + done);
                done += 1;
        }
out:
        retval = count;

        spin_unlock(&image->lock);

        return retval;
}

static unsigned int ca91cx42_master_rmw(struct vme_master_resource *image,
        unsigned int mask, unsigned int compare, unsigned int swap,
        loff_t offset)
{
        u32 result;
        uintptr_t pci_addr;
        int i;
        struct ca91cx42_driver *bridge;
        struct device *dev;

        bridge = image->parent->driver_priv;
        dev = image->parent->parent;

        /* Find the PCI address that maps to the desired VME address */
        i = image->number;

        /* Locking as we can only do one of these at a time */
        mutex_lock(&bridge->vme_rmw);

        /* Lock image */
        spin_lock(&image->lock);

        pci_addr = (uintptr_t)image->kern_base + offset;

        /* Address must be 4-byte aligned */
        if (pci_addr & 0x3) {
                dev_err(dev, "RMW Address not 4-byte aligned\n");
                result = -EINVAL;
                goto out;
        }

        /* Ensure RMW Disabled whilst configuring */
        iowrite32(0, bridge->base + SCYC_CTL);

        /* Configure registers */
        iowrite32(mask, bridge->base + SCYC_EN);
        iowrite32(compare, bridge->base + SCYC_CMP);
        iowrite32(swap, bridge->base + SCYC_SWP);
        iowrite32(pci_addr, bridge->base + SCYC_ADDR);

        /* Enable RMW */
        iowrite32(CA91CX42_SCYC_CTL_CYC_RMW, bridge->base + SCYC_CTL);

        /* Kick process off with a read to the required address. */
        result = ioread32(image->kern_base + offset);

        /* Disable RMW */
        iowrite32(0, bridge->base + SCYC_CTL);

out:
        spin_unlock(&image->lock);

        mutex_unlock(&bridge->vme_rmw);

        return result;
}

static int ca91cx42_dma_list_add(struct vme_dma_list *list,
        struct vme_dma_attr *src, struct vme_dma_attr *dest, size_t count)
{
        struct ca91cx42_dma_entry *entry, *prev;
        struct vme_dma_pci *pci_attr;
        struct vme_dma_vme *vme_attr;
        dma_addr_t desc_ptr;
        int retval = 0;
        struct device *dev;

        dev = list->parent->parent->parent;

        /* XXX descriptor must be aligned on 64-bit boundaries */
        entry = kmalloc(sizeof(*entry), GFP_KERNEL);
        if (!entry) {
                retval = -ENOMEM;
                goto err_mem;
        }

        /* Test descriptor alignment */
        if ((unsigned long)&entry->descriptor & CA91CX42_DCPP_M) {
                dev_err(dev, "Descriptor not aligned to 16 byte boundary as "
                        "required: %p\n", &entry->descriptor);
                retval = -EINVAL;
                goto err_align;
        }

        memset(&entry->descriptor, 0, sizeof(entry->descriptor));

        if (dest->type == VME_DMA_VME) {
                entry->descriptor.dctl |= CA91CX42_DCTL_L2V;
                vme_attr = dest->private;
                pci_attr = src->private;
        } else {
                vme_attr = src->private;
                pci_attr = dest->private;
        }

        /* Check we can do fulfill required attributes */
        if ((vme_attr->aspace & ~(VME_A16 | VME_A24 | VME_A32 | VME_USER1 |
                VME_USER2)) != 0) {

                dev_err(dev, "Unsupported cycle type\n");
                retval = -EINVAL;
                goto err_aspace;
        }

        if ((vme_attr->cycle & ~(VME_SCT | VME_BLT | VME_SUPER | VME_USER |
                VME_PROG | VME_DATA)) != 0) {

                dev_err(dev, "Unsupported cycle type\n");
                retval = -EINVAL;
                goto err_cycle;
        }

        /* Check to see if we can fulfill source and destination */
        if (!(((src->type == VME_DMA_PCI) && (dest->type == VME_DMA_VME)) ||
                ((src->type == VME_DMA_VME) && (dest->type == VME_DMA_PCI)))) {

                dev_err(dev, "Cannot perform transfer with this "
                        "source-destination combination\n");
                retval = -EINVAL;
                goto err_direct;
        }

        /* Setup cycle types */
        if (vme_attr->cycle & VME_BLT)
                entry->descriptor.dctl |= CA91CX42_DCTL_VCT_BLT;

        /* Setup data width */
        switch (vme_attr->dwidth) {
        case VME_D8:
                entry->descriptor.dctl |= CA91CX42_DCTL_VDW_D8;
                break;
        case VME_D16:
                entry->descriptor.dctl |= CA91CX42_DCTL_VDW_D16;
                break;
        case VME_D32:
                entry->descriptor.dctl |= CA91CX42_DCTL_VDW_D32;
                break;
        case VME_D64:
                entry->descriptor.dctl |= CA91CX42_DCTL_VDW_D64;
                break;
        default:
                dev_err(dev, "Invalid data width\n");
                return -EINVAL;
        }

        /* Setup address space */
        switch (vme_attr->aspace) {
        case VME_A16:
                entry->descriptor.dctl |= CA91CX42_DCTL_VAS_A16;
                break;
        case VME_A24:
                entry->descriptor.dctl |= CA91CX42_DCTL_VAS_A24;
                break;
        case VME_A32:
                entry->descriptor.dctl |= CA91CX42_DCTL_VAS_A32;
                break;
        case VME_USER1:
                entry->descriptor.dctl |= CA91CX42_DCTL_VAS_USER1;
                break;
        case VME_USER2:
                entry->descriptor.dctl |= CA91CX42_DCTL_VAS_USER2;
                break;
        default:
                dev_err(dev, "Invalid address space\n");
                return -EINVAL;
                break;
        }

        if (vme_attr->cycle & VME_SUPER)
                entry->descriptor.dctl |= CA91CX42_DCTL_SUPER_SUPR;
        if (vme_attr->cycle & VME_PROG)
                entry->descriptor.dctl |= CA91CX42_DCTL_PGM_PGM;

        entry->descriptor.dtbc = count;
        entry->descriptor.dla = pci_attr->address;
        entry->descriptor.dva = vme_attr->address;
        entry->descriptor.dcpp = CA91CX42_DCPP_NULL;

        /* Add to list */
        list_add_tail(&entry->list, &list->entries);

        /* Fill out previous descriptors "Next Address" */
        if (entry->list.prev != &list->entries) {
                prev = list_entry(entry->list.prev, struct ca91cx42_dma_entry,
                        list);
                /* We need the bus address for the pointer */
                desc_ptr = virt_to_bus(&entry->descriptor);
                prev->descriptor.dcpp = desc_ptr & ~CA91CX42_DCPP_M;
        }

        return 0;

err_cycle:
err_aspace:
err_direct:
err_align:
        kfree(entry);
err_mem:
        return retval;
}

static int ca91cx42_dma_busy(struct vme_bridge *ca91cx42_bridge)
{
        u32 tmp;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;

        tmp = ioread32(bridge->base + DGCS);

        if (tmp & CA91CX42_DGCS_ACT)
                return 0;
        else
                return 1;
}

static int ca91cx42_dma_list_exec(struct vme_dma_list *list)
{
        struct vme_dma_resource *ctrlr;
        struct ca91cx42_dma_entry *entry;
        int retval;
        dma_addr_t bus_addr;
        u32 val;
        struct device *dev;
        struct ca91cx42_driver *bridge;

        ctrlr = list->parent;

        bridge = ctrlr->parent->driver_priv;
        dev = ctrlr->parent->parent;

        mutex_lock(&ctrlr->mtx);

        if (!(list_empty(&ctrlr->running))) {
                /*
                 * XXX We have an active DMA transfer and currently haven't
                 *     sorted out the mechanism for "pending" DMA transfers.
                 *     Return busy.
                 */
                /* Need to add to pending here */
                mutex_unlock(&ctrlr->mtx);
                return -EBUSY;
        } else {
                list_add(&list->list, &ctrlr->running);
        }

        /* Get first bus address and write into registers */
        entry = list_first_entry(&list->entries, struct ca91cx42_dma_entry,
                list);

        bus_addr = virt_to_bus(&entry->descriptor);

        mutex_unlock(&ctrlr->mtx);

        iowrite32(0, bridge->base + DTBC);
        iowrite32(bus_addr & ~CA91CX42_DCPP_M, bridge->base + DCPP);

        /* Start the operation */
        val = ioread32(bridge->base + DGCS);

        /* XXX Could set VMEbus On and Off Counters here */
        val &= (CA91CX42_DGCS_VON_M | CA91CX42_DGCS_VOFF_M);

        val |= (CA91CX42_DGCS_CHAIN | CA91CX42_DGCS_STOP | CA91CX42_DGCS_HALT |
                CA91CX42_DGCS_DONE | CA91CX42_DGCS_LERR | CA91CX42_DGCS_VERR |
                CA91CX42_DGCS_PERR);

        iowrite32(val, bridge->base + DGCS);

        val |= CA91CX42_DGCS_GO;

        iowrite32(val, bridge->base + DGCS);

        retval = wait_event_interruptible(bridge->dma_queue,
                                          ca91cx42_dma_busy(ctrlr->parent));

        if (retval) {
                val = ioread32(bridge->base + DGCS);
                iowrite32(val | CA91CX42_DGCS_STOP_REQ, bridge->base + DGCS);
                /* Wait for the operation to abort */
                wait_event(bridge->dma_queue,
                           ca91cx42_dma_busy(ctrlr->parent));
                retval = -EINTR;
                goto exit;
        }

        /*
         * Read status register, this register is valid until we kick off a
         * new transfer.
         */
        val = ioread32(bridge->base + DGCS);

        if (val & (CA91CX42_DGCS_LERR | CA91CX42_DGCS_VERR |
                CA91CX42_DGCS_PERR)) {

                dev_err(dev, "ca91c042: DMA Error. DGCS=%08X\n", val);
                val = ioread32(bridge->base + DCTL);
                retval = -EIO;
        }

exit:
        /* Remove list from running list */
        mutex_lock(&ctrlr->mtx);
        list_del(&list->list);
        mutex_unlock(&ctrlr->mtx);

        return retval;

}

static int ca91cx42_dma_list_empty(struct vme_dma_list *list)
{
        struct list_head *pos, *temp;
        struct ca91cx42_dma_entry *entry;

        /* detach and free each entry */
        list_for_each_safe(pos, temp, &list->entries) {
                list_del(pos);
                entry = list_entry(pos, struct ca91cx42_dma_entry, list);
                kfree(entry);
        }

        return 0;
}

/*
 * All 4 location monitors reside at the same base - this is therefore a
 * system wide configuration.
 *
 * This does not enable the LM monitor - that should be done when the first
 * callback is attached and disabled when the last callback is removed.
 */
static int ca91cx42_lm_set(struct vme_lm_resource *lm,
        unsigned long long lm_base, u32 aspace, u32 cycle)
{
        u32 temp_base, lm_ctl = 0;
        int i;
        struct ca91cx42_driver *bridge;
        struct device *dev;

        bridge = lm->parent->driver_priv;
        dev = lm->parent->parent;

        /* Check the alignment of the location monitor */
        temp_base = (u32)lm_base;
        if (temp_base & 0xffff) {
                dev_err(dev, "Location monitor must be aligned to 64KB "
                        "boundary");
                return -EINVAL;
        }

        mutex_lock(&lm->mtx);

        /* If we already have a callback attached, we can't move it! */
        for (i = 0; i < lm->monitors; i++) {
                if (bridge->lm_callback[i]) {
                        mutex_unlock(&lm->mtx);
                        dev_err(dev, "Location monitor callback attached, "
                                "can't reset\n");
                        return -EBUSY;
                }
        }

        switch (aspace) {
        case VME_A16:
                lm_ctl |= CA91CX42_LM_CTL_AS_A16;
                break;
        case VME_A24:
                lm_ctl |= CA91CX42_LM_CTL_AS_A24;
                break;
        case VME_A32:
                lm_ctl |= CA91CX42_LM_CTL_AS_A32;
                break;
        default:
                mutex_unlock(&lm->mtx);
                dev_err(dev, "Invalid address space\n");
                return -EINVAL;
                break;
        }

        if (cycle & VME_SUPER)
                lm_ctl |= CA91CX42_LM_CTL_SUPR;
        if (cycle & VME_USER)
                lm_ctl |= CA91CX42_LM_CTL_NPRIV;
        if (cycle & VME_PROG)
                lm_ctl |= CA91CX42_LM_CTL_PGM;
        if (cycle & VME_DATA)
                lm_ctl |= CA91CX42_LM_CTL_DATA;

        iowrite32(lm_base, bridge->base + LM_BS);
        iowrite32(lm_ctl, bridge->base + LM_CTL);

        mutex_unlock(&lm->mtx);

        return 0;
}

/* Get configuration of the callback monitor and return whether it is enabled
 * or disabled.
 */
static int ca91cx42_lm_get(struct vme_lm_resource *lm,
        unsigned long long *lm_base, u32 *aspace, u32 *cycle)
{
        u32 lm_ctl, enabled = 0;
        struct ca91cx42_driver *bridge;

        bridge = lm->parent->driver_priv;

        mutex_lock(&lm->mtx);

        *lm_base = (unsigned long long)ioread32(bridge->base + LM_BS);
        lm_ctl = ioread32(bridge->base + LM_CTL);

        if (lm_ctl & CA91CX42_LM_CTL_EN)
                enabled = 1;

        if ((lm_ctl & CA91CX42_LM_CTL_AS_M) == CA91CX42_LM_CTL_AS_A16)
                *aspace = VME_A16;
        if ((lm_ctl & CA91CX42_LM_CTL_AS_M) == CA91CX42_LM_CTL_AS_A24)
                *aspace = VME_A24;
        if ((lm_ctl & CA91CX42_LM_CTL_AS_M) == CA91CX42_LM_CTL_AS_A32)
                *aspace = VME_A32;

        *cycle = 0;
        if (lm_ctl & CA91CX42_LM_CTL_SUPR)
                *cycle |= VME_SUPER;
        if (lm_ctl & CA91CX42_LM_CTL_NPRIV)
                *cycle |= VME_USER;
        if (lm_ctl & CA91CX42_LM_CTL_PGM)
                *cycle |= VME_PROG;
        if (lm_ctl & CA91CX42_LM_CTL_DATA)
                *cycle |= VME_DATA;

        mutex_unlock(&lm->mtx);

        return enabled;
}

/*
 * Attach a callback to a specific location monitor.
 *
 * Callback will be passed the monitor triggered.
 */
static int ca91cx42_lm_attach(struct vme_lm_resource *lm, int monitor,
        void (*callback)(void *), void *data)
{
        u32 lm_ctl, tmp;
        struct ca91cx42_driver *bridge;
        struct device *dev;

        bridge = lm->parent->driver_priv;
        dev = lm->parent->parent;

        mutex_lock(&lm->mtx);

        /* Ensure that the location monitor is configured - need PGM or DATA */
        lm_ctl = ioread32(bridge->base + LM_CTL);
        if ((lm_ctl & (CA91CX42_LM_CTL_PGM | CA91CX42_LM_CTL_DATA)) == 0) {
                mutex_unlock(&lm->mtx);
                dev_err(dev, "Location monitor not properly configured\n");
                return -EINVAL;
        }

        /* Check that a callback isn't already attached */
        if (bridge->lm_callback[monitor]) {
                mutex_unlock(&lm->mtx);
                dev_err(dev, "Existing callback attached\n");
                return -EBUSY;
        }

        /* Attach callback */
        bridge->lm_callback[monitor] = callback;
        bridge->lm_data[monitor] = data;

        /* Enable Location Monitor interrupt */
        tmp = ioread32(bridge->base + LINT_EN);
        tmp |= CA91CX42_LINT_LM[monitor];
        iowrite32(tmp, bridge->base + LINT_EN);

        /* Ensure that global Location Monitor Enable set */
        if ((lm_ctl & CA91CX42_LM_CTL_EN) == 0) {
                lm_ctl |= CA91CX42_LM_CTL_EN;
                iowrite32(lm_ctl, bridge->base + LM_CTL);
        }

        mutex_unlock(&lm->mtx);

        return 0;
}

/*
 * Detach a callback function forn a specific location monitor.
 */
static int ca91cx42_lm_detach(struct vme_lm_resource *lm, int monitor)
{
        u32 tmp;
        struct ca91cx42_driver *bridge;

        bridge = lm->parent->driver_priv;

        mutex_lock(&lm->mtx);

        /* Disable Location Monitor and ensure previous interrupts are clear */
        tmp = ioread32(bridge->base + LINT_EN);
        tmp &= ~CA91CX42_LINT_LM[monitor];
        iowrite32(tmp, bridge->base + LINT_EN);

        iowrite32(CA91CX42_LINT_LM[monitor],
                 bridge->base + LINT_STAT);

        /* Detach callback */
        bridge->lm_callback[monitor] = NULL;
        bridge->lm_data[monitor] = NULL;

        /* If all location monitors disabled, disable global Location Monitor */
        if ((tmp & (CA91CX42_LINT_LM0 | CA91CX42_LINT_LM1 | CA91CX42_LINT_LM2 |
                        CA91CX42_LINT_LM3)) == 0) {
                tmp = ioread32(bridge->base + LM_CTL);
                tmp &= ~CA91CX42_LM_CTL_EN;
                iowrite32(tmp, bridge->base + LM_CTL);
        }

        mutex_unlock(&lm->mtx);

        return 0;
}

static int ca91cx42_slot_get(struct vme_bridge *ca91cx42_bridge)
{
        u32 slot = 0;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;

        if (!geoid) {
                slot = ioread32(bridge->base + VCSR_BS);
                slot = ((slot & CA91CX42_VCSR_BS_SLOT_M) >> 27);
        } else
                slot = geoid;

        return (int)slot;

}

static void *ca91cx42_alloc_consistent(struct device *parent, size_t size,
        dma_addr_t *dma)
{
        struct pci_dev *pdev;

        /* Find pci_dev container of dev */
        pdev = to_pci_dev(parent);

        return pci_alloc_consistent(pdev, size, dma);
}

static void ca91cx42_free_consistent(struct device *parent, size_t size,
        void *vaddr, dma_addr_t dma)
{
        struct pci_dev *pdev;

        /* Find pci_dev container of dev */
        pdev = to_pci_dev(parent);

        pci_free_consistent(pdev, size, vaddr, dma);
}

/*
 * Configure CR/CSR space
 *
 * Access to the CR/CSR can be configured at power-up. The location of the
 * CR/CSR registers in the CR/CSR address space is determined by the boards
 * Auto-ID or Geographic address. This function ensures that the window is
 * enabled at an offset consistent with the boards geopgraphic address.
 */
static int ca91cx42_crcsr_init(struct vme_bridge *ca91cx42_bridge,
        struct pci_dev *pdev)
{
        unsigned int crcsr_addr;
        int tmp, slot;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;

        slot = ca91cx42_slot_get(ca91cx42_bridge);

        /* Write CSR Base Address if slot ID is supplied as a module param */
        if (geoid)
                iowrite32(geoid << 27, bridge->base + VCSR_BS);

        dev_info(&pdev->dev, "CR/CSR Offset: %d\n", slot);
        if (slot == 0) {
                dev_err(&pdev->dev, "Slot number is unset, not configuring "
                        "CR/CSR space\n");
                return -EINVAL;
        }

        /* Allocate mem for CR/CSR image */
        bridge->crcsr_kernel = pci_zalloc_consistent(pdev, VME_CRCSR_BUF_SIZE,
                                                     &bridge->crcsr_bus);
        if (!bridge->crcsr_kernel) {
                dev_err(&pdev->dev, "Failed to allocate memory for CR/CSR "
                        "image\n");
                return -ENOMEM;
        }

        crcsr_addr = slot * (512 * 1024);
        iowrite32(bridge->crcsr_bus - crcsr_addr, bridge->base + VCSR_TO);

        tmp = ioread32(bridge->base + VCSR_CTL);
        tmp |= CA91CX42_VCSR_CTL_EN;
        iowrite32(tmp, bridge->base + VCSR_CTL);

        return 0;
}

static void ca91cx42_crcsr_exit(struct vme_bridge *ca91cx42_bridge,
        struct pci_dev *pdev)
{
        u32 tmp;
        struct ca91cx42_driver *bridge;

        bridge = ca91cx42_bridge->driver_priv;

        /* Turn off CR/CSR space */
        tmp = ioread32(bridge->base + VCSR_CTL);
        tmp &= ~CA91CX42_VCSR_CTL_EN;
        iowrite32(tmp, bridge->base + VCSR_CTL);

        /* Free image */
        iowrite32(0, bridge->base + VCSR_TO);

        pci_free_consistent(pdev, VME_CRCSR_BUF_SIZE, bridge->crcsr_kernel,
                bridge->crcsr_bus);
}

static int ca91cx42_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
        int retval, i;
        u32 data;
        struct list_head *pos = NULL, *n;
        struct vme_bridge *ca91cx42_bridge;
        struct ca91cx42_driver *ca91cx42_device;
        struct vme_master_resource *master_image;
        struct vme_slave_resource *slave_image;
        struct vme_dma_resource *dma_ctrlr;
        struct vme_lm_resource *lm;

        /* We want to support more than one of each bridge so we need to
         * dynamically allocate the bridge structure
         */
        ca91cx42_bridge = kzalloc(sizeof(*ca91cx42_bridge), GFP_KERNEL);
        if (!ca91cx42_bridge) {
                retval = -ENOMEM;
                goto err_struct;
        }
        vme_init_bridge(ca91cx42_bridge);

        ca91cx42_device = kzalloc(sizeof(*ca91cx42_device), GFP_KERNEL);
        if (!ca91cx42_device) {
                retval = -ENOMEM;
                goto err_driver;
        }

        ca91cx42_bridge->driver_priv = ca91cx42_device;

        /* Enable the device */
        retval = pci_enable_device(pdev);
        if (retval) {
                dev_err(&pdev->dev, "Unable to enable device\n");
                goto err_enable;
        }

        /* Map Registers */
        retval = pci_request_regions(pdev, driver_name);
        if (retval) {
                dev_err(&pdev->dev, "Unable to reserve resources\n");
                goto err_resource;
        }

        /* map registers in BAR 0 */
        ca91cx42_device->base = ioremap_nocache(pci_resource_start(pdev, 0),
                4096);
        if (!ca91cx42_device->base) {
                dev_err(&pdev->dev, "Unable to remap CRG region\n");
                retval = -EIO;
                goto err_remap;
        }

        /* Check to see if the mapping worked out */
        data = ioread32(ca91cx42_device->base + CA91CX42_PCI_ID) & 0x0000FFFF;
        if (data != PCI_VENDOR_ID_TUNDRA) {
                dev_err(&pdev->dev, "PCI_ID check failed\n");
                retval = -EIO;
                goto err_test;
        }

        /* Initialize wait queues & mutual exclusion flags */
        init_waitqueue_head(&ca91cx42_device->dma_queue);
        init_waitqueue_head(&ca91cx42_device->iack_queue);
        mutex_init(&ca91cx42_device->vme_int);
        mutex_init(&ca91cx42_device->vme_rmw);

        ca91cx42_bridge->parent = &pdev->dev;
        strcpy(ca91cx42_bridge->name, driver_name);

        /* Setup IRQ */
        retval = ca91cx42_irq_init(ca91cx42_bridge);
        if (retval != 0) {
                dev_err(&pdev->dev, "Chip Initialization failed.\n");
                goto err_irq;
        }

        /* Add master windows to list */
        for (i = 0; i < CA91C142_MAX_MASTER; i++) {
                master_image = kmalloc(sizeof(*master_image), GFP_KERNEL);
                if (!master_image) {
                        retval = -ENOMEM;
                        goto err_master;
                }
                master_image->parent = ca91cx42_bridge;
                spin_lock_init(&master_image->lock);
                master_image->locked = 0;
                master_image->number = i;
                master_image->address_attr = VME_A16 | VME_A24 | VME_A32 |
                        VME_CRCSR | VME_USER1 | VME_USER2;
                master_image->cycle_attr = VME_SCT | VME_BLT | VME_MBLT |
                        VME_SUPER | VME_USER | VME_PROG | VME_DATA;
                master_image->width_attr = VME_D8 | VME_D16 | VME_D32 | VME_D64;
                memset(&master_image->bus_resource, 0,
                       sizeof(master_image->bus_resource));
                master_image->kern_base  = NULL;
                list_add_tail(&master_image->list,
                        &ca91cx42_bridge->master_resources);
        }

        /* Add slave windows to list */
        for (i = 0; i < CA91C142_MAX_SLAVE; i++) {
                slave_image = kmalloc(sizeof(*slave_image), GFP_KERNEL);
                if (!slave_image) {
                        retval = -ENOMEM;
                        goto err_slave;
                }
                slave_image->parent = ca91cx42_bridge;
                mutex_init(&slave_image->mtx);
                slave_image->locked = 0;
                slave_image->number = i;
                slave_image->address_attr = VME_A24 | VME_A32 | VME_USER1 |
                        VME_USER2;

                /* Only windows 0 and 4 support A16 */
                if (i == 0 || i == 4)
                        slave_image->address_attr |= VME_A16;

                slave_image->cycle_attr = VME_SCT | VME_BLT | VME_MBLT |
                        VME_SUPER | VME_USER | VME_PROG | VME_DATA;
                list_add_tail(&slave_image->list,
                        &ca91cx42_bridge->slave_resources);
        }

        /* Add dma engines to list */
        for (i = 0; i < CA91C142_MAX_DMA; i++) {
                dma_ctrlr = kmalloc(sizeof(*dma_ctrlr), GFP_KERNEL);
                if (!dma_ctrlr) {
                        retval = -ENOMEM;
                        goto err_dma;
                }
                dma_ctrlr->parent = ca91cx42_bridge;
                mutex_init(&dma_ctrlr->mtx);
                dma_ctrlr->locked = 0;
                dma_ctrlr->number = i;
                dma_ctrlr->route_attr = VME_DMA_VME_TO_MEM |
                        VME_DMA_MEM_TO_VME;
                INIT_LIST_HEAD(&dma_ctrlr->pending);
                INIT_LIST_HEAD(&dma_ctrlr->running);
                list_add_tail(&dma_ctrlr->list,
                        &ca91cx42_bridge->dma_resources);
        }

        /* Add location monitor to list */
        lm = kmalloc(sizeof(*lm), GFP_KERNEL);
        if (!lm) {
                retval = -ENOMEM;
                goto err_lm;
        }
        lm->parent = ca91cx42_bridge;
        mutex_init(&lm->mtx);
        lm->locked = 0;
        lm->number = 1;
        lm->monitors = 4;
        list_add_tail(&lm->list, &ca91cx42_bridge->lm_resources);

        ca91cx42_bridge->slave_get = ca91cx42_slave_get;
        ca91cx42_bridge->slave_set = ca91cx42_slave_set;
        ca91cx42_bridge->master_get = ca91cx42_master_get;
        ca91cx42_bridge->master_set = ca91cx42_master_set;
        ca91cx42_bridge->master_read = ca91cx42_master_read;
        ca91cx42_bridge->master_write = ca91cx42_master_write;
        ca91cx42_bridge->master_rmw = ca91cx42_master_rmw;
        ca91cx42_bridge->dma_list_add = ca91cx42_dma_list_add;
        ca91cx42_bridge->dma_list_exec = ca91cx42_dma_list_exec;
        ca91cx42_bridge->dma_list_empty = ca91cx42_dma_list_empty;
        ca91cx42_bridge->irq_set = ca91cx42_irq_set;
        ca91cx42_bridge->irq_generate = ca91cx42_irq_generate;
        ca91cx42_bridge->lm_set = ca91cx42_lm_set;
        ca91cx42_bridge->lm_get = ca91cx42_lm_get;
        ca91cx42_bridge->lm_attach = ca91cx42_lm_attach;
        ca91cx42_bridge->lm_detach = ca91cx42_lm_detach;
        ca91cx42_bridge->slot_get = ca91cx42_slot_get;
        ca91cx42_bridge->alloc_consistent = ca91cx42_alloc_consistent;
        ca91cx42_bridge->free_consistent = ca91cx42_free_consistent;

        data = ioread32(ca91cx42_device->base + MISC_CTL);
        dev_info(&pdev->dev, "Board is%s the VME system controller\n",
                (data & CA91CX42_MISC_CTL_SYSCON) ? "" : " not");
        dev_info(&pdev->dev, "Slot ID is %d\n",
                ca91cx42_slot_get(ca91cx42_bridge));

        if (ca91cx42_crcsr_init(ca91cx42_bridge, pdev))
                dev_err(&pdev->dev, "CR/CSR configuration failed.\n");

        /* Need to save ca91cx42_bridge pointer locally in link list for use in
         * ca91cx42_remove()
         */
        retval = vme_register_bridge(ca91cx42_bridge);
        if (retval != 0) {
                dev_err(&pdev->dev, "Chip Registration failed.\n");
                goto err_reg;
        }

        pci_set_drvdata(pdev, ca91cx42_bridge);

        return 0;

err_reg:
        ca91cx42_crcsr_exit(ca91cx42_bridge, pdev);
err_lm:
        /* resources are stored in link list */
        list_for_each_safe(pos, n, &ca91cx42_bridge->lm_resources) {
                lm = list_entry(pos, struct vme_lm_resource, list);
                list_del(pos);
                kfree(lm);
        }
err_dma:
        /* resources are stored in link list */
        list_for_each_safe(pos, n, &ca91cx42_bridge->dma_resources) {
                dma_ctrlr = list_entry(pos, struct vme_dma_resource, list);
                list_del(pos);
                kfree(dma_ctrlr);
        }
err_slave:
        /* resources are stored in link list */
        list_for_each_safe(pos, n, &ca91cx42_bridge->slave_resources) {
                slave_image = list_entry(pos, struct vme_slave_resource, list);
                list_del(pos);
                kfree(slave_image);
        }
err_master:
        /* resources are stored in link list */
        list_for_each_safe(pos, n, &ca91cx42_bridge->master_resources) {
                master_image = list_entry(pos, struct vme_master_resource,
                        list);
                list_del(pos);
                kfree(master_image);
        }

        ca91cx42_irq_exit(ca91cx42_device, pdev);
err_irq:
err_test:
        iounmap(ca91cx42_device->base);
err_remap:
        pci_release_regions(pdev);
err_resource:
        pci_disable_device(pdev);
err_enable:
        kfree(ca91cx42_device);
err_driver:
        kfree(ca91cx42_bridge);
err_struct:
        return retval;

}

static void ca91cx42_remove(struct pci_dev *pdev)
{
        struct list_head *pos = NULL, *n;
        struct vme_master_resource *master_image;
        struct vme_slave_resource *slave_image;
        struct vme_dma_resource *dma_ctrlr;
        struct vme_lm_resource *lm;
        struct ca91cx42_driver *bridge;
        struct vme_bridge *ca91cx42_bridge = pci_get_drvdata(pdev);

        bridge = ca91cx42_bridge->driver_priv;


        /* Turn off Ints */
        iowrite32(0, bridge->base + LINT_EN);

        /* Turn off the windows */
        iowrite32(0x00800000, bridge->base + LSI0_CTL);
        iowrite32(0x00800000, bridge->base + LSI1_CTL);
        iowrite32(0x00800000, bridge->base + LSI2_CTL);
        iowrite32(0x00800000, bridge->base + LSI3_CTL);
        iowrite32(0x00800000, bridge->base + LSI4_CTL);
        iowrite32(0x00800000, bridge->base + LSI5_CTL);
        iowrite32(0x00800000, bridge->base + LSI6_CTL);
        iowrite32(0x00800000, bridge->base + LSI7_CTL);
        iowrite32(0x00F00000, bridge->base + VSI0_CTL);
        iowrite32(0x00F00000, bridge->base + VSI1_CTL);
        iowrite32(0x00F00000, bridge->base + VSI2_CTL);
        iowrite32(0x00F00000, bridge->base + VSI3_CTL);
        iowrite32(0x00F00000, bridge->base + VSI4_CTL);
        iowrite32(0x00F00000, bridge->base + VSI5_CTL);
        iowrite32(0x00F00000, bridge->base + VSI6_CTL);
        iowrite32(0x00F00000, bridge->base + VSI7_CTL);

        vme_unregister_bridge(ca91cx42_bridge);

        ca91cx42_crcsr_exit(ca91cx42_bridge, pdev);

        /* resources are stored in link list */
        list_for_each_safe(pos, n, &ca91cx42_bridge->lm_resources) {
                lm = list_entry(pos, struct vme_lm_resource, list);
                list_del(pos);
                kfree(lm);
        }

        /* resources are stored in link list */
        list_for_each_safe(pos, n, &ca91cx42_bridge->dma_resources) {
                dma_ctrlr = list_entry(pos, struct vme_dma_resource, list);
                list_del(pos);
                kfree(dma_ctrlr);
        }

        /* resources are stored in link list */
        list_for_each_safe(pos, n, &ca91cx42_bridge->slave_resources) {
                slave_image = list_entry(pos, struct vme_slave_resource, list);
                list_del(pos);
                kfree(slave_image);
        }

        /* resources are stored in link list */
        list_for_each_safe(pos, n, &ca91cx42_bridge->master_resources) {
                master_image = list_entry(pos, struct vme_master_resource,
                        list);
                list_del(pos);
                kfree(master_image);
        }

        ca91cx42_irq_exit(bridge, pdev);

        iounmap(bridge->base);

        pci_release_regions(pdev);

        pci_disable_device(pdev);

        kfree(ca91cx42_bridge);
}

module_pci_driver(ca91cx42_driver);

MODULE_PARM_DESC(geoid, "Override geographical addressing");
module_param(geoid, int, 0);

MODULE_DESCRIPTION("VME driver for the Tundra Universe II VME bridge");
MODULE_LICENSE("GPL");