121 строка
3.8 KiB
C
121 строка
3.8 KiB
C
/* 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
|