/* * IOMMU API for MTK architected m4u v1 implementations * * Copyright (c) 2015-2016 MediaTek Inc. * Author: Honghui Zhang * * Based on driver/iommu/mtk_iommu.c * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mtk_iommu.h" #define REG_MMU_PT_BASE_ADDR 0x000 #define F_ALL_INVLD 0x2 #define F_MMU_INV_RANGE 0x1 #define F_INVLD_EN0 BIT(0) #define F_INVLD_EN1 BIT(1) #define F_MMU_FAULT_VA_MSK 0xfffff000 #define MTK_PROTECT_PA_ALIGN 128 #define REG_MMU_CTRL_REG 0x210 #define F_MMU_CTRL_COHERENT_EN BIT(8) #define REG_MMU_IVRP_PADDR 0x214 #define REG_MMU_INT_CONTROL 0x220 #define F_INT_TRANSLATION_FAULT BIT(0) #define F_INT_MAIN_MULTI_HIT_FAULT BIT(1) #define F_INT_INVALID_PA_FAULT BIT(2) #define F_INT_ENTRY_REPLACEMENT_FAULT BIT(3) #define F_INT_TABLE_WALK_FAULT BIT(4) #define F_INT_TLB_MISS_FAULT BIT(5) #define F_INT_PFH_DMA_FIFO_OVERFLOW BIT(6) #define F_INT_MISS_DMA_FIFO_OVERFLOW BIT(7) #define F_MMU_TF_PROTECT_SEL(prot) (((prot) & 0x3) << 5) #define F_INT_CLR_BIT BIT(12) #define REG_MMU_FAULT_ST 0x224 #define REG_MMU_FAULT_VA 0x228 #define REG_MMU_INVLD_PA 0x22C #define REG_MMU_INT_ID 0x388 #define REG_MMU_INVALIDATE 0x5c0 #define REG_MMU_INVLD_START_A 0x5c4 #define REG_MMU_INVLD_END_A 0x5c8 #define REG_MMU_INV_SEL 0x5d8 #define REG_MMU_STANDARD_AXI_MODE 0x5e8 #define REG_MMU_DCM 0x5f0 #define F_MMU_DCM_ON BIT(1) #define REG_MMU_CPE_DONE 0x60c #define F_DESC_VALID 0x2 #define F_DESC_NONSEC BIT(3) #define MT2701_M4U_TF_LARB(TF) (6 - (((TF) >> 13) & 0x7)) #define MT2701_M4U_TF_PORT(TF) (((TF) >> 8) & 0xF) /* MTK generation one iommu HW only support 4K size mapping */ #define MT2701_IOMMU_PAGE_SHIFT 12 #define MT2701_IOMMU_PAGE_SIZE (1UL << MT2701_IOMMU_PAGE_SHIFT) /* * MTK m4u support 4GB iova address space, and only support 4K page * mapping. So the pagetable size should be exactly as 4M. */ #define M2701_IOMMU_PGT_SIZE SZ_4M struct mtk_iommu_domain { spinlock_t pgtlock; /* lock for page table */ struct iommu_domain domain; u32 *pgt_va; dma_addr_t pgt_pa; struct mtk_iommu_data *data; }; static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom) { return container_of(dom, struct mtk_iommu_domain, domain); } static const int mt2701_m4u_in_larb[] = { LARB0_PORT_OFFSET, LARB1_PORT_OFFSET, LARB2_PORT_OFFSET, LARB3_PORT_OFFSET }; static inline int mt2701_m4u_to_larb(int id) { int i; for (i = ARRAY_SIZE(mt2701_m4u_in_larb) - 1; i >= 0; i--) if ((id) >= mt2701_m4u_in_larb[i]) return i; return 0; } static inline int mt2701_m4u_to_port(int id) { int larb = mt2701_m4u_to_larb(id); return id - mt2701_m4u_in_larb[larb]; } static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data) { writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, data->base + REG_MMU_INV_SEL); writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE); wmb(); /* Make sure the tlb flush all done */ } static void mtk_iommu_tlb_flush_range(struct mtk_iommu_data *data, unsigned long iova, size_t size) { int ret; u32 tmp; writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0, data->base + REG_MMU_INV_SEL); writel_relaxed(iova & F_MMU_FAULT_VA_MSK, data->base + REG_MMU_INVLD_START_A); writel_relaxed((iova + size - 1) & F_MMU_FAULT_VA_MSK, data->base + REG_MMU_INVLD_END_A); writel_relaxed(F_MMU_INV_RANGE, data->base + REG_MMU_INVALIDATE); ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE, tmp, tmp != 0, 10, 100000); if (ret) { dev_warn(data->dev, "Partial TLB flush timed out, falling back to full flush\n"); mtk_iommu_tlb_flush_all(data); } /* Clear the CPE status */ writel_relaxed(0, data->base + REG_MMU_CPE_DONE); } static irqreturn_t mtk_iommu_isr(int irq, void *dev_id) { struct mtk_iommu_data *data = dev_id; struct mtk_iommu_domain *dom = data->m4u_dom; u32 int_state, regval, fault_iova, fault_pa; unsigned int fault_larb, fault_port; /* Read error information from registers */ int_state = readl_relaxed(data->base + REG_MMU_FAULT_ST); fault_iova = readl_relaxed(data->base + REG_MMU_FAULT_VA); fault_iova &= F_MMU_FAULT_VA_MSK; fault_pa = readl_relaxed(data->base + REG_MMU_INVLD_PA); regval = readl_relaxed(data->base + REG_MMU_INT_ID); fault_larb = MT2701_M4U_TF_LARB(regval); fault_port = MT2701_M4U_TF_PORT(regval); /* * MTK v1 iommu HW could not determine whether the fault is read or * write fault, report as read fault. */ if (report_iommu_fault(&dom->domain, data->dev, fault_iova, IOMMU_FAULT_READ)) dev_err_ratelimited(data->dev, "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d\n", int_state, fault_iova, fault_pa, fault_larb, fault_port); /* Interrupt clear */ regval = readl_relaxed(data->base + REG_MMU_INT_CONTROL); regval |= F_INT_CLR_BIT; writel_relaxed(regval, data->base + REG_MMU_INT_CONTROL); mtk_iommu_tlb_flush_all(data); return IRQ_HANDLED; } static void mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev, bool enable) { struct mtk_smi_larb_iommu *larb_mmu; unsigned int larbid, portid; struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); int i; for (i = 0; i < fwspec->num_ids; ++i) { larbid = mt2701_m4u_to_larb(fwspec->ids[i]); portid = mt2701_m4u_to_port(fwspec->ids[i]); larb_mmu = &data->smi_imu.larb_imu[larbid]; dev_dbg(dev, "%s iommu port: %d\n", enable ? "enable" : "disable", portid); if (enable) larb_mmu->mmu |= MTK_SMI_MMU_EN(portid); else larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid); } } static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data) { struct mtk_iommu_domain *dom = data->m4u_dom; spin_lock_init(&dom->pgtlock); dom->pgt_va = dma_zalloc_coherent(data->dev, M2701_IOMMU_PGT_SIZE, &dom->pgt_pa, GFP_KERNEL); if (!dom->pgt_va) return -ENOMEM; writel(dom->pgt_pa, data->base + REG_MMU_PT_BASE_ADDR); dom->data = data; return 0; } static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type) { struct mtk_iommu_domain *dom; if (type != IOMMU_DOMAIN_UNMANAGED) return NULL; dom = kzalloc(sizeof(*dom), GFP_KERNEL); if (!dom) return NULL; return &dom->domain; } static void mtk_iommu_domain_free(struct iommu_domain *domain) { struct mtk_iommu_domain *dom = to_mtk_domain(domain); struct mtk_iommu_data *data = dom->data; dma_free_coherent(data->dev, M2701_IOMMU_PGT_SIZE, dom->pgt_va, dom->pgt_pa); kfree(to_mtk_domain(domain)); } static int mtk_iommu_attach_device(struct iommu_domain *domain, struct device *dev) { struct mtk_iommu_domain *dom = to_mtk_domain(domain); struct mtk_iommu_data *data = dev_iommu_fwspec_get(dev)->iommu_priv; int ret; if (!data) return -ENODEV; if (!data->m4u_dom) { data->m4u_dom = dom; ret = mtk_iommu_domain_finalise(data); if (ret) { data->m4u_dom = NULL; return ret; } } mtk_iommu_config(data, dev, true); return 0; } static void mtk_iommu_detach_device(struct iommu_domain *domain, struct device *dev) { struct mtk_iommu_data *data = dev_iommu_fwspec_get(dev)->iommu_priv; if (!data) return; mtk_iommu_config(data, dev, false); } static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t size, int prot) { struct mtk_iommu_domain *dom = to_mtk_domain(domain); unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT; unsigned long flags; unsigned int i; u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT); u32 pabase = (u32)paddr; int map_size = 0; spin_lock_irqsave(&dom->pgtlock, flags); for (i = 0; i < page_num; i++) { if (pgt_base_iova[i]) { memset(pgt_base_iova, 0, i * sizeof(u32)); break; } pgt_base_iova[i] = pabase | F_DESC_VALID | F_DESC_NONSEC; pabase += MT2701_IOMMU_PAGE_SIZE; map_size += MT2701_IOMMU_PAGE_SIZE; } spin_unlock_irqrestore(&dom->pgtlock, flags); mtk_iommu_tlb_flush_range(dom->data, iova, size); return map_size == size ? 0 : -EEXIST; } static size_t mtk_iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) { struct mtk_iommu_domain *dom = to_mtk_domain(domain); unsigned long flags; u32 *pgt_base_iova = dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT); unsigned int page_num = size >> MT2701_IOMMU_PAGE_SHIFT; spin_lock_irqsave(&dom->pgtlock, flags); memset(pgt_base_iova, 0, page_num * sizeof(u32)); spin_unlock_irqrestore(&dom->pgtlock, flags); mtk_iommu_tlb_flush_range(dom->data, iova, size); return size; } static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova) { struct mtk_iommu_domain *dom = to_mtk_domain(domain); unsigned long flags; phys_addr_t pa; spin_lock_irqsave(&dom->pgtlock, flags); pa = *(dom->pgt_va + (iova >> MT2701_IOMMU_PAGE_SHIFT)); pa = pa & (~(MT2701_IOMMU_PAGE_SIZE - 1)); spin_unlock_irqrestore(&dom->pgtlock, flags); return pa; } static struct iommu_ops mtk_iommu_ops; /* * MTK generation one iommu HW only support one iommu domain, and all the client * sharing the same iova address space. */ static int mtk_iommu_create_mapping(struct device *dev, struct of_phandle_args *args) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); struct mtk_iommu_data *data; struct platform_device *m4updev; struct dma_iommu_mapping *mtk_mapping; struct device *m4udev; int ret; if (args->args_count != 1) { dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n", args->args_count); return -EINVAL; } if (!fwspec) { ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_ops); if (ret) return ret; fwspec = dev_iommu_fwspec_get(dev); } else if (dev_iommu_fwspec_get(dev)->ops != &mtk_iommu_ops) { return -EINVAL; } if (!fwspec->iommu_priv) { /* Get the m4u device */ m4updev = of_find_device_by_node(args->np); if (WARN_ON(!m4updev)) return -EINVAL; fwspec->iommu_priv = platform_get_drvdata(m4updev); } ret = iommu_fwspec_add_ids(dev, args->args, 1); if (ret) return ret; data = fwspec->iommu_priv; m4udev = data->dev; mtk_mapping = m4udev->archdata.iommu; if (!mtk_mapping) { /* MTK iommu support 4GB iova address space. */ mtk_mapping = arm_iommu_create_mapping(&platform_bus_type, 0, 1ULL << 32); if (IS_ERR(mtk_mapping)) return PTR_ERR(mtk_mapping); m4udev->archdata.iommu = mtk_mapping; } return 0; } static int mtk_iommu_add_device(struct device *dev) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); struct dma_iommu_mapping *mtk_mapping; struct of_phandle_args iommu_spec; struct of_phandle_iterator it; struct mtk_iommu_data *data; struct iommu_group *group; int err; of_for_each_phandle(&it, err, dev->of_node, "iommus", "#iommu-cells", 0) { int count = of_phandle_iterator_args(&it, iommu_spec.args, MAX_PHANDLE_ARGS); iommu_spec.np = of_node_get(it.node); iommu_spec.args_count = count; mtk_iommu_create_mapping(dev, &iommu_spec); of_node_put(iommu_spec.np); } if (!fwspec || fwspec->ops != &mtk_iommu_ops) return -ENODEV; /* Not a iommu client device */ /* * This is a short-term bodge because the ARM DMA code doesn't * understand multi-device groups, but we have to call into it * successfully (and not just rely on a normal IOMMU API attach * here) in order to set the correct DMA API ops on @dev. */ group = iommu_group_alloc(); if (IS_ERR(group)) return PTR_ERR(group); err = iommu_group_add_device(group, dev); iommu_group_put(group); if (err) return err; data = fwspec->iommu_priv; mtk_mapping = data->dev->archdata.iommu; err = arm_iommu_attach_device(dev, mtk_mapping); if (err) { iommu_group_remove_device(dev); return err; } return iommu_device_link(&data->iommu, dev);; } static void mtk_iommu_remove_device(struct device *dev) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); struct mtk_iommu_data *data; if (!fwspec || fwspec->ops != &mtk_iommu_ops) return; data = fwspec->iommu_priv; iommu_device_unlink(&data->iommu, dev); iommu_group_remove_device(dev); 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 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, .add_device = mtk_iommu_add_device, .remove_device = mtk_iommu_remove_device, .pgsize_bitmap = ~0UL << MT2701_IOMMU_PAGE_SHIFT, }; 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; struct of_phandle_args larb_spec; struct of_phandle_iterator it; void *protect; int larb_nr, ret, err; 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 = 0; of_for_each_phandle(&it, err, dev->of_node, "mediatek,larbs", NULL, 0) { struct platform_device *plarbdev; int count = of_phandle_iterator_args(&it, larb_spec.args, MAX_PHANDLE_ARGS); if (count) continue; larb_spec.np = of_node_get(it.node); if (!of_device_is_available(larb_spec.np)) continue; plarbdev = of_find_device_by_node(larb_spec.np); if (!plarbdev) { plarbdev = of_platform_device_create( larb_spec.np, NULL, platform_bus_type.dev_root); if (!plarbdev) { of_node_put(larb_spec.np); return -EPROBE_DEFER; } } data->smi_imu.larb_imu[larb_nr].dev = &plarbdev->dev; component_match_add_release(dev, &match, release_of, compare_of, larb_spec.np); larb_nr++; } data->smi_imu.larb_nr = larb_nr; 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; iommu_device_set_ops(&data->iommu, &mtk_iommu_ops); ret = iommu_device_register(&data->iommu); if (ret) return ret; if (!iommu_present(&platform_bus_type)) bus_set_iommu(&platform_bus_type, &mtk_iommu_ops); return component_master_add_with_match(dev, &mtk_iommu_com_ops, match); } 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, } }; static int __init m4u_init(void) { return platform_driver_register(&mtk_iommu_driver); } subsys_initcall(m4u_init);