705 lines
18 KiB
C
705 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* IOMMU API for MTK architected m4u v1 implementations
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*
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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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* Based on driver/iommu/mtk_iommu.c
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*/
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#include <linux/memblock.h>
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#include <linux/bug.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/dma-mapping.h>
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#include <linux/dma-iommu.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/iommu.h>
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#include <linux/iopoll.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <asm/barrier.h>
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#include <asm/dma-iommu.h>
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#include <linux/init.h>
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#include <dt-bindings/memory/mt2701-larb-port.h>
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#include <soc/mediatek/smi.h>
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#include "mtk_iommu.h"
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#define REG_MMU_PT_BASE_ADDR 0x000
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#define F_ALL_INVLD 0x2
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#define F_MMU_INV_RANGE 0x1
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#define F_INVLD_EN0 BIT(0)
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#define F_INVLD_EN1 BIT(1)
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#define F_MMU_FAULT_VA_MSK 0xfffff000
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#define MTK_PROTECT_PA_ALIGN 128
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#define REG_MMU_CTRL_REG 0x210
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#define F_MMU_CTRL_COHERENT_EN BIT(8)
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#define REG_MMU_IVRP_PADDR 0x214
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#define REG_MMU_INT_CONTROL 0x220
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#define F_INT_TRANSLATION_FAULT BIT(0)
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#define F_INT_MAIN_MULTI_HIT_FAULT BIT(1)
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#define F_INT_INVALID_PA_FAULT BIT(2)
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#define F_INT_ENTRY_REPLACEMENT_FAULT BIT(3)
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#define F_INT_TABLE_WALK_FAULT BIT(4)
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#define F_INT_TLB_MISS_FAULT BIT(5)
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#define F_INT_PFH_DMA_FIFO_OVERFLOW BIT(6)
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#define F_INT_MISS_DMA_FIFO_OVERFLOW BIT(7)
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#define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5)
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#define F_INT_CLR_BIT BIT(12)
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#define REG_MMU_FAULT_ST 0x224
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#define REG_MMU_FAULT_VA 0x228
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#define REG_MMU_INVLD_PA 0x22C
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#define REG_MMU_INT_ID 0x388
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#define REG_MMU_INVALIDATE 0x5c0
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#define REG_MMU_INVLD_START_A 0x5c4
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#define REG_MMU_INVLD_END_A 0x5c8
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#define REG_MMU_INV_SEL 0x5d8
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#define REG_MMU_STANDARD_AXI_MODE 0x5e8
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#define REG_MMU_DCM 0x5f0
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#define F_MMU_DCM_ON BIT(1)
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#define REG_MMU_CPE_DONE 0x60c
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#define F_DESC_VALID 0x2
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#define F_DESC_NONSEC BIT(3)
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#define MT2701_M4U_TF_LARB(TF) (6 - (((TF) >> 13) & 0x7))
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#define MT2701_M4U_TF_PORT(TF) (((TF) >> 8) & 0xF)
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/* MTK generation one iommu HW only support 4K size mapping */
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#define MT2701_IOMMU_PAGE_SHIFT 12
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#define MT2701_IOMMU_PAGE_SIZE (1UL << MT2701_IOMMU_PAGE_SHIFT)
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/*
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* MTK m4u support 4GB iova address space, and only support 4K page
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* mapping. So the pagetable size should be exactly as 4M.
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*/
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#define M2701_IOMMU_PGT_SIZE SZ_4M
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struct mtk_iommu_domain {
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spinlock_t pgtlock; /* lock for page table */
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struct iommu_domain domain;
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u32 *pgt_va;
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dma_addr_t pgt_pa;
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struct mtk_iommu_data *data;
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};
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static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
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{
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return container_of(dom, struct mtk_iommu_domain, domain);
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}
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static const int mt2701_m4u_in_larb[] = {
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LARB0_PORT_OFFSET, LARB1_PORT_OFFSET,
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LARB2_PORT_OFFSET, LARB3_PORT_OFFSET
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};
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static inline int mt2701_m4u_to_larb(int id)
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{
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int i;
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for (i = ARRAY_SIZE(mt2701_m4u_in_larb) - 1; i >= 0; i--)
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if ((id) >= mt2701_m4u_in_larb[i])
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return i;
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return 0;
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}
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static inline int mt2701_m4u_to_port(int id)
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{
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int larb = mt2701_m4u_to_larb(id);
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return id - mt2701_m4u_in_larb[larb];
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}
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static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
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{
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writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
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data->base + REG_MMU_INV_SEL);
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writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
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wmb(); /* Make sure the tlb flush all done */
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}
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static void mtk_iommu_tlb_flush_range(struct mtk_iommu_data *data,
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unsigned long iova, size_t size)
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{
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int ret;
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u32 tmp;
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writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
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data->base + REG_MMU_INV_SEL);
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writel_relaxed(iova & F_MMU_FAULT_VA_MSK,
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data->base + REG_MMU_INVLD_START_A);
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writel_relaxed((iova + size - 1) & F_MMU_FAULT_VA_MSK,
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data->base + REG_MMU_INVLD_END_A);
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writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE);
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ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE,
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tmp, tmp != 0, 10, 100000);
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if (ret) {
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dev_warn(data->dev,
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"Partial TLB flush timed out, falling back to full flush\n");
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mtk_iommu_tlb_flush_all(data);
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}
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/* Clear the CPE status */
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writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
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}
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static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
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{
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struct mtk_iommu_data *data = dev_id;
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struct mtk_iommu_domain *dom = data->m4u_dom;
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u32 int_state, regval, fault_iova, fault_pa;
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unsigned int fault_larb, fault_port;
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/* Read error information from registers */
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int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST);
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fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA);
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fault_iova &= F_MMU_FAULT_VA_MSK;
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fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA);
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regval = readl_relaxed(data->base + REG_MMU_INT_ID);
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fault_larb = MT2701_M4U_TF_LARB(regval);
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fault_port = MT2701_M4U_TF_PORT(regval);
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/*
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* MTK v1 iommu HW could not determine whether the fault is read or
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* write fault, report as read fault.
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*/
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if (report_iommu_fault(&dom->domain, data->dev, fault_iova,
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IOMMU_FAULT_READ))
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dev_err_ratelimited(data->dev,
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"fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d\n",
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int_state, fault_iova, fault_pa,
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fault_larb, fault_port);
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/* Interrupt clear */
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regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL);
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regval |= F_INT_CLR_BIT;
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writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL);
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mtk_iommu_tlb_flush_all(data);
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return IRQ_HANDLED;
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}
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static void mtk_iommu_config(struct mtk_iommu_data *data,
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struct device *dev, bool enable)
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{
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struct mtk_smi_larb_iommu *larb_mmu;
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unsigned int larbid, portid;
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struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
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int i;
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for (i = 0; i < fwspec->num_ids; ++i) {
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larbid = mt2701_m4u_to_larb(fwspec->ids[i]);
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portid = mt2701_m4u_to_port(fwspec->ids[i]);
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larb_mmu = &data->larb_imu[larbid];
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dev_dbg(dev, "%s iommu port: %d\n",
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enable ? "enable" : "disable", portid);
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if (enable)
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larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
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else
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larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
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}
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}
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static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data)
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{
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struct mtk_iommu_domain *dom = data->m4u_dom;
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spin_lock_init(&dom->pgtlock);
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dom->pgt_va = dma_alloc_coherent(data->dev, M2701_IOMMU_PGT_SIZE,
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&dom->pgt_pa, GFP_KERNEL);
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if (!dom->pgt_va)
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return -ENOMEM;
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writel(dom->pgt_pa, data->base + REG_MMU_PT_BASE_ADDR);
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dom->data = data;
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return 0;
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}
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static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
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{
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struct mtk_iommu_domain *dom;
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if (type != IOMMU_DOMAIN_UNMANAGED)
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return NULL;
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dom = kzalloc(sizeof(*dom), GFP_KERNEL);
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if (!dom)
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return NULL;
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return &dom->domain;
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}
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static void mtk_iommu_domain_free(struct iommu_domain *domain)
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{
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struct mtk_iommu_domain *dom = to_mtk_domain(domain);
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struct mtk_iommu_data *data = dom->data;
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dma_free_coherent(data->dev, M2701_IOMMU_PGT_SIZE,
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dom->pgt_va, dom->pgt_pa);
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kfree(to_mtk_domain(domain));
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}
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static int mtk_iommu_attach_device(struct iommu_domain *domain,
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struct device *dev)
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{
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struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
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struct mtk_iommu_domain *dom = to_mtk_domain(domain);
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struct dma_iommu_mapping *mtk_mapping;
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int ret;
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/* Only allow the domain created internally. */
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mtk_mapping = data->mapping;
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if (mtk_mapping->domain != domain)
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return 0;
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if (!data->m4u_dom) {
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data->m4u_dom = dom;
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ret = mtk_iommu_domain_finalise(data);
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if (ret) {
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data->m4u_dom = NULL;
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return ret;
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}
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}
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mtk_iommu_config(data, dev, true);
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return 0;
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}
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static void mtk_iommu_detach_device(struct iommu_domain *domain,
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struct device *dev)
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{
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struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
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mtk_iommu_config(data, dev, false);
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}
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static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
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phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
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{
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struct mtk_iommu_domain *dom = to_mtk_domain(domain);
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unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT;
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unsigned long flags;
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unsigned int i;
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u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT);
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u32 pabase = (u32)paddr;
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int map_size = 0;
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spin_lock_irqsave(&dom->pgtlock, flags);
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for (i = 0; i < page_num; i++) {
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if (pgt_base_iova[i]) {
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memset(pgt_base_iova, 0, i * sizeof(u32));
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break;
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}
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pgt_base_iova[i] = pabase | F_DESC_VALID | F_DESC_NONSEC;
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pabase += MT2701_IOMMU_PAGE_SIZE;
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map_size += MT2701_IOMMU_PAGE_SIZE;
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}
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spin_unlock_irqrestore(&dom->pgtlock, flags);
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mtk_iommu_tlb_flush_range(dom->data, iova, size);
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return map_size == size ? 0 : -EEXIST;
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}
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static size_t mtk_iommu_unmap(struct iommu_domain *domain,
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unsigned long iova, size_t size,
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struct iommu_iotlb_gather *gather)
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{
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struct mtk_iommu_domain *dom = to_mtk_domain(domain);
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unsigned long flags;
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u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT);
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unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT;
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spin_lock_irqsave(&dom->pgtlock, flags);
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memset(pgt_base_iova, 0, page_num * sizeof(u32));
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spin_unlock_irqrestore(&dom->pgtlock, flags);
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mtk_iommu_tlb_flush_range(dom->data, iova, size);
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return size;
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}
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static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
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dma_addr_t iova)
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{
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struct mtk_iommu_domain *dom = to_mtk_domain(domain);
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unsigned long flags;
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phys_addr_t pa;
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spin_lock_irqsave(&dom->pgtlock, flags);
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pa = *(dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT));
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pa = pa & (~(MT2701_IOMMU_PAGE_SIZE - 1));
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spin_unlock_irqrestore(&dom->pgtlock, flags);
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return pa;
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}
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static const struct iommu_ops mtk_iommu_ops;
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/*
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* MTK generation one iommu HW only support one iommu domain, and all the client
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* sharing the same iova address space.
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*/
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static int mtk_iommu_create_mapping(struct device *dev,
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struct of_phandle_args *args)
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{
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struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
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struct mtk_iommu_data *data;
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struct platform_device *m4updev;
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struct dma_iommu_mapping *mtk_mapping;
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int ret;
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if (args->args_count != 1) {
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dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n",
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args->args_count);
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return -EINVAL;
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}
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if (!fwspec) {
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ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_ops);
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if (ret)
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return ret;
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fwspec = dev_iommu_fwspec_get(dev);
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} else if (dev_iommu_fwspec_get(dev)->ops != &mtk_iommu_ops) {
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return -EINVAL;
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}
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if (!dev_iommu_priv_get(dev)) {
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/* Get the m4u device */
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m4updev = of_find_device_by_node(args->np);
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if (WARN_ON(!m4updev))
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return -EINVAL;
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dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
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}
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ret = iommu_fwspec_add_ids(dev, args->args, 1);
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if (ret)
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return ret;
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data = dev_iommu_priv_get(dev);
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mtk_mapping = data->mapping;
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if (!mtk_mapping) {
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/* MTK iommu support 4GB iova address space. */
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mtk_mapping = arm_iommu_create_mapping(&platform_bus_type,
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0, 1ULL << 32);
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if (IS_ERR(mtk_mapping))
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return PTR_ERR(mtk_mapping);
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data->mapping = mtk_mapping;
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}
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return 0;
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}
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static int mtk_iommu_def_domain_type(struct device *dev)
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{
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return IOMMU_DOMAIN_UNMANAGED;
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}
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static struct iommu_device *mtk_iommu_probe_device(struct device *dev)
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{
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struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
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struct of_phandle_args iommu_spec;
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struct mtk_iommu_data *data;
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int err, idx = 0;
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while (!of_parse_phandle_with_args(dev->of_node, "iommus",
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"#iommu-cells",
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idx, &iommu_spec)) {
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err = mtk_iommu_create_mapping(dev, &iommu_spec);
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of_node_put(iommu_spec.np);
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if (err)
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return ERR_PTR(err);
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/* dev->iommu_fwspec might have changed */
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fwspec = dev_iommu_fwspec_get(dev);
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idx++;
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}
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if (!fwspec || fwspec->ops != &mtk_iommu_ops)
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return ERR_PTR(-ENODEV); /* Not a iommu client device */
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data = dev_iommu_priv_get(dev);
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return &data->iommu;
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}
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static void mtk_iommu_probe_finalize(struct device *dev)
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{
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struct dma_iommu_mapping *mtk_mapping;
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struct mtk_iommu_data *data;
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int err;
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data = dev_iommu_priv_get(dev);
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mtk_mapping = data->mapping;
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err = arm_iommu_attach_device(dev, mtk_mapping);
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if (err)
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dev_err(dev, "Can't create IOMMU mapping - DMA-OPS will not work\n");
|
|
}
|
|
|
|
static void mtk_iommu_release_device(struct device *dev)
|
|
{
|
|
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
|
|
|
|
if (!fwspec || fwspec->ops != &mtk_iommu_ops)
|
|
return;
|
|
|
|
iommu_fwspec_free(dev);
|
|
}
|
|
|
|
static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
|
|
{
|
|
u32 regval;
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(data->bclk);
|
|
if (ret) {
|
|
dev_err(data->dev, "Failed to enable iommu bclk(%d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
regval = F_MMU_CTRL_COHERENT_EN | F_MMU_TF_PROTECT_SEL(2);
|
|
writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
|
|
|
|
regval = F_INT_TRANSLATION_FAULT |
|
|
F_INT_MAIN_MULTI_HIT_FAULT |
|
|
F_INT_INVALID_PA_FAULT |
|
|
F_INT_ENTRY_REPLACEMENT_FAULT |
|
|
F_INT_TABLE_WALK_FAULT |
|
|
F_INT_TLB_MISS_FAULT |
|
|
F_INT_PFH_DMA_FIFO_OVERFLOW |
|
|
F_INT_MISS_DMA_FIFO_OVERFLOW;
|
|
writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL);
|
|
|
|
/* protect memory,hw will write here while translation fault */
|
|
writel_relaxed(data->protect_base,
|
|
data->base + REG_MMU_IVRP_PADDR);
|
|
|
|
writel_relaxed(F_MMU_DCM_ON, data->base + REG_MMU_DCM);
|
|
|
|
if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
|
|
dev_name(data->dev), (void *)data)) {
|
|
writel_relaxed(0, data->base + REG_MMU_PT_BASE_ADDR);
|
|
clk_disable_unprepare(data->bclk);
|
|
dev_err(data->dev, "Failed @ IRQ-%d Request\n", data->irq);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iommu_ops mtk_iommu_ops = {
|
|
.domain_alloc = mtk_iommu_domain_alloc,
|
|
.domain_free = mtk_iommu_domain_free,
|
|
.attach_dev = mtk_iommu_attach_device,
|
|
.detach_dev = mtk_iommu_detach_device,
|
|
.map = mtk_iommu_map,
|
|
.unmap = mtk_iommu_unmap,
|
|
.iova_to_phys = mtk_iommu_iova_to_phys,
|
|
.probe_device = mtk_iommu_probe_device,
|
|
.probe_finalize = mtk_iommu_probe_finalize,
|
|
.release_device = mtk_iommu_release_device,
|
|
.def_domain_type = mtk_iommu_def_domain_type,
|
|
.device_group = generic_device_group,
|
|
.pgsize_bitmap = ~0UL << MT2701_IOMMU_PAGE_SHIFT,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static const struct of_device_id mtk_iommu_of_ids[] = {
|
|
{ .compatible = "mediatek,mt2701-m4u", },
|
|
{}
|
|
};
|
|
|
|
static const struct component_master_ops mtk_iommu_com_ops = {
|
|
.bind = mtk_iommu_bind,
|
|
.unbind = mtk_iommu_unbind,
|
|
};
|
|
|
|
static int mtk_iommu_probe(struct platform_device *pdev)
|
|
{
|
|
struct mtk_iommu_data *data;
|
|
struct device *dev = &pdev->dev;
|
|
struct resource *res;
|
|
struct component_match *match = NULL;
|
|
void *protect;
|
|
int larb_nr, ret, i;
|
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->dev = dev;
|
|
|
|
/* Protect memory. HW will access here while translation fault.*/
|
|
protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2,
|
|
GFP_KERNEL | GFP_DMA);
|
|
if (!protect)
|
|
return -ENOMEM;
|
|
data->protect_base = ALIGN(virt_to_phys(protect), MTK_PROTECT_PA_ALIGN);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
data->base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(data->base))
|
|
return PTR_ERR(data->base);
|
|
|
|
data->irq = platform_get_irq(pdev, 0);
|
|
if (data->irq < 0)
|
|
return data->irq;
|
|
|
|
data->bclk = devm_clk_get(dev, "bclk");
|
|
if (IS_ERR(data->bclk))
|
|
return PTR_ERR(data->bclk);
|
|
|
|
larb_nr = of_count_phandle_with_args(dev->of_node,
|
|
"mediatek,larbs", NULL);
|
|
if (larb_nr < 0)
|
|
return larb_nr;
|
|
|
|
for (i = 0; i < larb_nr; i++) {
|
|
struct device_node *larbnode;
|
|
struct platform_device *plarbdev;
|
|
|
|
larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i);
|
|
if (!larbnode)
|
|
return -EINVAL;
|
|
|
|
if (!of_device_is_available(larbnode)) {
|
|
of_node_put(larbnode);
|
|
continue;
|
|
}
|
|
|
|
plarbdev = of_find_device_by_node(larbnode);
|
|
if (!plarbdev) {
|
|
of_node_put(larbnode);
|
|
return -EPROBE_DEFER;
|
|
}
|
|
data->larb_imu[i].dev = &plarbdev->dev;
|
|
|
|
component_match_add_release(dev, &match, release_of,
|
|
compare_of, larbnode);
|
|
}
|
|
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
ret = mtk_iommu_hw_init(data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
|
|
dev_name(&pdev->dev));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = iommu_device_register(&data->iommu, &mtk_iommu_ops, dev);
|
|
if (ret)
|
|
goto out_sysfs_remove;
|
|
|
|
if (!iommu_present(&platform_bus_type)) {
|
|
ret = bus_set_iommu(&platform_bus_type, &mtk_iommu_ops);
|
|
if (ret)
|
|
goto out_dev_unreg;
|
|
}
|
|
|
|
ret = component_master_add_with_match(dev, &mtk_iommu_com_ops, match);
|
|
if (ret)
|
|
goto out_bus_set_null;
|
|
return ret;
|
|
|
|
out_bus_set_null:
|
|
bus_set_iommu(&platform_bus_type, NULL);
|
|
out_dev_unreg:
|
|
iommu_device_unregister(&data->iommu);
|
|
out_sysfs_remove:
|
|
iommu_device_sysfs_remove(&data->iommu);
|
|
return ret;
|
|
}
|
|
|
|
static int mtk_iommu_remove(struct platform_device *pdev)
|
|
{
|
|
struct mtk_iommu_data *data = platform_get_drvdata(pdev);
|
|
|
|
iommu_device_sysfs_remove(&data->iommu);
|
|
iommu_device_unregister(&data->iommu);
|
|
|
|
if (iommu_present(&platform_bus_type))
|
|
bus_set_iommu(&platform_bus_type, NULL);
|
|
|
|
clk_disable_unprepare(data->bclk);
|
|
devm_free_irq(&pdev->dev, data->irq, data);
|
|
component_master_del(&pdev->dev, &mtk_iommu_com_ops);
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused mtk_iommu_suspend(struct device *dev)
|
|
{
|
|
struct mtk_iommu_data *data = dev_get_drvdata(dev);
|
|
struct mtk_iommu_suspend_reg *reg = &data->reg;
|
|
void __iomem *base = data->base;
|
|
|
|
reg->standard_axi_mode = readl_relaxed(base +
|
|
REG_MMU_STANDARD_AXI_MODE);
|
|
reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM);
|
|
reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG);
|
|
reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL);
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused mtk_iommu_resume(struct device *dev)
|
|
{
|
|
struct mtk_iommu_data *data = dev_get_drvdata(dev);
|
|
struct mtk_iommu_suspend_reg *reg = &data->reg;
|
|
void __iomem *base = data->base;
|
|
|
|
writel_relaxed(data->m4u_dom->pgt_pa, base + REG_MMU_PT_BASE_ADDR);
|
|
writel_relaxed(reg->standard_axi_mode,
|
|
base + REG_MMU_STANDARD_AXI_MODE);
|
|
writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM);
|
|
writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG);
|
|
writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL);
|
|
writel_relaxed(data->protect_base, base + REG_MMU_IVRP_PADDR);
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops mtk_iommu_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
|
|
};
|
|
|
|
static struct platform_driver mtk_iommu_driver = {
|
|
.probe = mtk_iommu_probe,
|
|
.remove = mtk_iommu_remove,
|
|
.driver = {
|
|
.name = "mtk-iommu-v1",
|
|
.of_match_table = mtk_iommu_of_ids,
|
|
.pm = &mtk_iommu_pm_ops,
|
|
}
|
|
};
|
|
module_platform_driver(mtk_iommu_driver);
|
|
|
|
MODULE_DESCRIPTION("IOMMU API for MediaTek M4U v1 implementations");
|
|
MODULE_LICENSE("GPL v2");
|