linux-imx

/*

 * omap iommu: main structures

 *

 * Copyright (C) 2008-2009 Nokia Corporation

 *

 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

#ifndef _OMAP_IOMMU_H

#define _OMAP_IOMMU_H

​

#include <linux/bitops.h>

#include <linux/iommu.h>

​

#define for_each_iotlb_cr(obj, n, __i, cr)              \

    for (__i = 0;                           \

         (__i < (n)) && (cr = __iotlb_read_cr((obj), __i), true);   \

         __i++)

​

struct iotlb_entry {

    u32 da;

    u32 pa;

    u32 pgsz, prsvd, valid;

    u32 endian, elsz, mixed;

};

​

/**

 * struct omap_iommu_device - omap iommu device data

 * @pgtable:    page table used by an omap iommu attached to a domain

 * @iommu_dev:  pointer to store an omap iommu instance attached to a domain

 */

struct omap_iommu_device {

    u32 *pgtable;

    struct omap_iommu *iommu_dev;

};

​

/**

 * struct omap_iommu_domain - omap iommu domain

 * @num_iommus: number of iommus in this domain

 * @iommus: omap iommu device data for all iommus in this domain

 * @dev:    Device using this domain.

 * @lock:   domain lock, should be taken when attaching/detaching

 * @domain: generic domain handle used by iommu core code

 */

struct omap_iommu_domain {

    u32 num_iommus;

    struct omap_iommu_device *iommus;

    struct device *dev;

    spinlock_t lock;

    struct iommu_domain domain;

};

​

struct omap_iommu {

    const char  *name;

    void __iomem    *regbase;

    struct regmap   *syscfg;

    struct device   *dev;

    struct iommu_domain *domain;

    struct dentry   *debug_dir;

​

    spinlock_t  iommu_lock; /* global for this whole object */

​

    /*

     * We don't change iopgd for a situation like pgd for a task,

     * but share it globally for each iommu.

     */

    u32     *iopgd;

    spinlock_t  page_table_lock; /* protect iopgd */

    dma_addr_t  pd_dma;

​

    int     nr_tlb_entries;

​

    void *ctx; /* iommu context: registres saved area */

​

    int has_bus_err_back;

    u32 id;

​

    struct iommu_device iommu;

    struct iommu_group *group;

};

​

/**

 * struct omap_iommu_arch_data - omap iommu private data

 * @iommu_dev: handle of the iommu device

 *

 * This is an omap iommu private data object, which binds an iommu user

 * to its iommu device. This object should be placed at the iommu user's

 * dev_archdata so generic IOMMU API can be used without having to