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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/iommu.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
/* Maximum number of context banks that can be present in IOMMU */
#define IOMMU_MAX_CBS 128
/**
* struct msm_iommu_dev - a single IOMMU hardware instance
* ncb Number of context banks present on this IOMMU HW instance
* dev: IOMMU device
* irq: Interrupt number
* clk: The bus clock for this IOMMU hardware instance
* pclk: The clock for the IOMMU bus interconnect
* dev_node: list head in qcom_iommu_device_list
* dom_node: list head for domain
* ctx_list: list of 'struct msm_iommu_ctx_dev'
* context_map: Bitmap to track allocated context banks
*/
struct msm_iommu_dev {
void __iomem *base;
int ncb;
struct device *dev;
int irq;
struct clk *clk;
struct clk *pclk;
struct list_head dev_node;
struct list_head dom_node;
struct list_head ctx_list;
DECLARE_BITMAP(context_map, IOMMU_MAX_CBS);
struct iommu_device iommu;
};
/**
* struct msm_iommu_ctx_dev - an IOMMU context bank instance
* of_node node ptr of client device
* 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).
* num_mids Total number of mids
* node list head in ctx_list
*/
struct msm_iommu_ctx_dev {
struct device_node *of_node;
int num;
int mids[MAX_NUM_MIDS];
int num_mids;
struct list_head list;
};
/*
* 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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