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/
usr/
src/
linux-headers-3.0.0-14/
arch/
arm/
mach-msm/
include/
mach/
- drwxr-xr-x
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Viewing file:  iommu.h (3.81 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
/* 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 - a single IOMMU hardware instance
* name Human-readable name given to this IOMMU HW instance
* ncb Number of context banks present on this IOMMU HW instance
*/
struct msm_iommu_dev {
const char *name;
int ncb;
};
/**
* struct msm_iommu_ctx_dev - an IOMMU context bank instance
* name Human-readable name given to this context bank
* num Index of this context bank within the hardware
* mids List of Machine IDs that are to be mapped into this context
* bank, terminated by -1. The MID is a set of signals on the
* AXI bus that identifies the function associated with a specific
* memory request. (See ARM spec).
*/
struct msm_iommu_ctx_dev {
const char *name;
int num;
int mids[MAX_NUM_MIDS];
};
/**
* struct msm_iommu_drvdata - A single IOMMU hardware instance
* @base: IOMMU config port base address (VA)
* @ncb The number of contexts on this IOMMU
* @irq: Interrupt number
* @clk: The bus clock for this IOMMU hardware instance
* @pclk: The clock for the IOMMU bus interconnect
*
* A msm_iommu_drvdata holds the global driver data about a single piece
* of an IOMMU hardware instance.
*/
struct msm_iommu_drvdata {
void __iomem *base;
int irq;
int ncb;
struct clk *clk;
struct clk *pclk;
};
/**
* struct msm_iommu_ctx_drvdata - an IOMMU context bank instance
* @num: Hardware context number of this context
* @pdev: Platform device associated wit this HW instance
* @attached_elm: List element for domains to track which devices are
* attached to them
*
* A msm_iommu_ctx_drvdata holds the driver data for a single context bank
* within each IOMMU hardware instance
*/
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
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