100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef MSM_IOMMU_H
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#define MSM_IOMMU_H
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#include <linux/interrupt.h>
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#include <linux/clk.h>
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/* Sharability attributes of MSM IOMMU mappings */
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#define MSM_IOMMU_ATTR_NON_SH 0x0
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#define MSM_IOMMU_ATTR_SH 0x4
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/* Cacheability attributes of MSM IOMMU mappings */
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#define MSM_IOMMU_ATTR_NONCACHED 0x0
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#define MSM_IOMMU_ATTR_CACHED_WB_WA 0x1
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#define MSM_IOMMU_ATTR_CACHED_WB_NWA 0x2
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#define MSM_IOMMU_ATTR_CACHED_WT 0x3
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/* Mask for the cache policy attribute */
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#define MSM_IOMMU_CP_MASK 0x03
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/* Maximum number of Machine IDs that we are allowing to be mapped to the same
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* context bank. The number of MIDs mapped to the same CB does not affect
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* performance, but there is a practical limit on how many distinct MIDs may
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* be present. These mappings are typically determined at design time and are
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* not expected to change at run time.
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*/
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#define MAX_NUM_MIDS 32
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/* Maximum number of context banks that can be present in IOMMU */
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#define IOMMU_MAX_CBS 128
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/**
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* struct msm_iommu_dev - a single IOMMU hardware instance
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* ncb Number of context banks present on this IOMMU HW instance
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* dev: IOMMU device
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* irq: Interrupt number
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* clk: The bus clock for this IOMMU hardware instance
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* pclk: The clock for the IOMMU bus interconnect
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* dev_node: list head in qcom_iommu_device_list
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* dom_node: list head for domain
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* ctx_list: list of 'struct msm_iommu_ctx_dev'
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* context_map: Bitmap to track allocated context banks
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*/
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struct msm_iommu_dev {
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void __iomem *base;
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int ncb;
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struct device *dev;
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int irq;
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struct clk *clk;
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struct clk *pclk;
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struct list_head dev_node;
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struct list_head dom_node;
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struct list_head ctx_list;
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DECLARE_BITMAP(context_map, IOMMU_MAX_CBS);
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};
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/**
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* struct msm_iommu_ctx_dev - an IOMMU context bank instance
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* of_node node ptr of client device
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* num Index of this context bank within the hardware
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* mids List of Machine IDs that are to be mapped into this context
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* bank, terminated by -1. The MID is a set of signals on the
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* AXI bus that identifies the function associated with a specific
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* memory request. (See ARM spec).
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* num_mids Total number of mids
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* node list head in ctx_list
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*/
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struct msm_iommu_ctx_dev {
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struct device_node *of_node;
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int num;
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int mids[MAX_NUM_MIDS];
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int num_mids;
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struct list_head list;
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};
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/*
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* Interrupt handler for the IOMMU context fault interrupt. Hooking the
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* interrupt is not supported in the API yet, but this will print an error
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* message and dump useful IOMMU registers.
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*/
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irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id);
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#endif
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