iommu.h

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/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef MSM_IOMMU_H
#define MSM_IOMMU_H

#include <linux/interrupt.h>
#include <linux/clk.h>

/* Sharability attributes of MSM IOMMU mappings */
#define MSM_IOMMU_ATTR_NON_SH       0x0
#define MSM_IOMMU_ATTR_SH       0x4

/* Cacheability attributes of MSM IOMMU mappings */
#define MSM_IOMMU_ATTR_NONCACHED    0x0
#define MSM_IOMMU_ATTR_CACHED_WB_WA 0x1
#define MSM_IOMMU_ATTR_CACHED_WB_NWA    0x2
#define MSM_IOMMU_ATTR_CACHED_WT    0x3

/* Mask for the cache policy attribute */
#define MSM_IOMMU_CP_MASK       0x03

/* Maximum number of Machine IDs that we are allowing to be mapped to the same
 * context bank. The number of MIDs mapped to the same CB does not affect
 * performance, but there is a practical limit on how many distinct MIDs may
 * be present. These mappings are typically determined at design time and are
 * not expected to change at run time.
 */
#define MAX_NUM_MIDS    32

struct msm_iommu_dev {
    const char *name;
    int ncb;
};

struct msm_iommu_ctx_dev {
    const char *name;
    int num;
    int mids[MAX_NUM_MIDS];
};


struct msm_iommu_drvdata {
    void __iomem *base;
    int irq;
    int ncb;
    struct clk *clk;
    struct clk *pclk;
};

struct msm_iommu_ctx_drvdata {
    int num;
    struct platform_device *pdev;
    struct list_head attached_elm;
};

/*
 * Look up an IOMMU context device by its context name. NULL if none found.
 * Useful for testing and drivers that do not yet fully have IOMMU stuff in
 * their platform devices.
 */
struct device *msm_iommu_get_ctx(const char *ctx_name);

/*
 * Interrupt handler for the IOMMU context fault interrupt. Hooking the
 * interrupt is not supported in the API yet, but this will print an error
 * message and dump useful IOMMU registers.
 */
irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id);

#endif