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In MediaTek's IOMMU design, When a iommu translation fault occurs
(HW can NOT translate the destination address to a valid physical
address), the IOMMU HW output the dirty data into a special memory
to avoid corrupting the main memory, this is called "protect memory".
the register(0x114) for protect memory is a little different between
mt8173 and mt2712.
In the mt8173, bit[30:6] in the register represents [31:7] of the
physical address. In the 4GB mode, the register bit[31] should be 1.
While in the mt2712, the bits don't shift. bit[31:7] in the register
represents [31:7] in the physical address, and bit[1:0] in the
register represents bit[33:32] of the physical address if it has.
Fixes: e6dec92308 ("iommu/mediatek: Add mt2712 IOMMU support")
Reported-by: Honghui Zhang <honghui.zhang@mediatek.com>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
/*
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* Copyright (c) 2015-2016 MediaTek Inc.
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* Author: Honghui Zhang <honghui.zhang@mediatek.com>
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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 as
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* 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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#ifndef _MTK_IOMMU_H_
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#define _MTK_IOMMU_H_
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#include <linux/clk.h>
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#include <linux/component.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/iommu.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <soc/mediatek/smi.h>
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#include "io-pgtable.h"
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struct mtk_iommu_suspend_reg {
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u32 standard_axi_mode;
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u32 dcm_dis;
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u32 ctrl_reg;
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u32 int_control0;
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u32 int_main_control;
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u32 ivrp_paddr;
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};
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enum mtk_iommu_plat {
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M4U_MT2701,
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M4U_MT2712,
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M4U_MT8173,
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};
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struct mtk_iommu_domain;
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struct mtk_iommu_data {
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void __iomem *base;
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int irq;
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struct device *dev;
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struct clk *bclk;
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phys_addr_t protect_base; /* protect memory base */
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struct mtk_iommu_suspend_reg reg;
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struct mtk_iommu_domain *m4u_dom;
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struct iommu_group *m4u_group;
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struct mtk_smi_iommu smi_imu; /* SMI larb iommu info */
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bool enable_4GB;
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bool tlb_flush_active;
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struct iommu_device iommu;
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enum mtk_iommu_plat m4u_plat;
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struct list_head list;
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};
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static inline int compare_of(struct device *dev, void *data)
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{
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return dev->of_node == data;
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}
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static inline void release_of(struct device *dev, void *data)
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{
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of_node_put(data);
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}
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static inline int mtk_iommu_bind(struct device *dev)
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{
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struct mtk_iommu_data *data = dev_get_drvdata(dev);
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return component_bind_all(dev, &data->smi_imu);
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}
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static inline void mtk_iommu_unbind(struct device *dev)
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{
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struct mtk_iommu_data *data = dev_get_drvdata(dev);
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component_unbind_all(dev, &data->smi_imu);
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}
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#endif
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