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-rw-r--r--drivers/iommu/mtk_iommu_v1.c767
1 files changed, 767 insertions, 0 deletions
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
new file mode 100644
index 000000000..a978220eb
--- /dev/null
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -0,0 +1,767 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * IOMMU API for MTK architected m4u v1 implementations
+ *
+ * Copyright (c) 2015-2016 MediaTek Inc.
+ * Author: Honghui Zhang <honghui.zhang@mediatek.com>
+ *
+ * Based on driver/iommu/mtk_iommu.c
+ */
+#include <linux/bug.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iommu.h>
+#include <linux/iopoll.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <asm/barrier.h>
+#include <asm/dma-iommu.h>
+#include <dt-bindings/memory/mtk-memory-port.h>
+#include <dt-bindings/memory/mt2701-larb-port.h>
+#include <soc/mediatek/smi.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)
+#define MT2701_LARB_NR_MAX 3
+
+/*
+ * 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_v1_suspend_reg {
+ u32 standard_axi_mode;
+ u32 dcm_dis;
+ u32 ctrl_reg;
+ u32 int_control0;
+};
+
+struct mtk_iommu_v1_data {
+ void __iomem *base;
+ int irq;
+ struct device *dev;
+ struct clk *bclk;
+ phys_addr_t protect_base; /* protect memory base */
+ struct mtk_iommu_v1_domain *m4u_dom;
+
+ struct iommu_device iommu;
+ struct dma_iommu_mapping *mapping;
+ struct mtk_smi_larb_iommu larb_imu[MTK_LARB_NR_MAX];
+
+ struct mtk_iommu_v1_suspend_reg reg;
+};
+
+struct mtk_iommu_v1_domain {
+ spinlock_t pgtlock; /* lock for page table */
+ struct iommu_domain domain;
+ u32 *pgt_va;
+ dma_addr_t pgt_pa;
+ struct mtk_iommu_v1_data *data;
+};
+
+static int mtk_iommu_v1_bind(struct device *dev)
+{
+ struct mtk_iommu_v1_data *data = dev_get_drvdata(dev);
+
+ return component_bind_all(dev, &data->larb_imu);
+}
+
+static void mtk_iommu_v1_unbind(struct device *dev)
+{
+ struct mtk_iommu_v1_data *data = dev_get_drvdata(dev);
+
+ component_unbind_all(dev, &data->larb_imu);
+}
+
+static struct mtk_iommu_v1_domain *to_mtk_domain(struct iommu_domain *dom)
+{
+ return container_of(dom, struct mtk_iommu_v1_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_v1_tlb_flush_all(struct mtk_iommu_v1_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_v1_tlb_flush_range(struct mtk_iommu_v1_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_v1_tlb_flush_all(data);
+ }
+ /* Clear the CPE status */
+ writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
+}
+
+static irqreturn_t mtk_iommu_v1_isr(int irq, void *dev_id)
+{
+ struct mtk_iommu_v1_data *data = dev_id;
+ struct mtk_iommu_v1_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_v1_tlb_flush_all(data);
+
+ return IRQ_HANDLED;
+}
+
+static void mtk_iommu_v1_config(struct mtk_iommu_v1_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->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_v1_domain_finalise(struct mtk_iommu_v1_data *data)
+{
+ struct mtk_iommu_v1_domain *dom = data->m4u_dom;
+
+ spin_lock_init(&dom->pgtlock);
+
+ dom->pgt_va = dma_alloc_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_v1_domain_alloc(unsigned type)
+{
+ struct mtk_iommu_v1_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_v1_domain_free(struct iommu_domain *domain)
+{
+ struct mtk_iommu_v1_domain *dom = to_mtk_domain(domain);
+ struct mtk_iommu_v1_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_v1_attach_device(struct iommu_domain *domain, struct device *dev)
+{
+ struct mtk_iommu_v1_data *data = dev_iommu_priv_get(dev);
+ struct mtk_iommu_v1_domain *dom = to_mtk_domain(domain);
+ struct dma_iommu_mapping *mtk_mapping;
+ int ret;
+
+ /* Only allow the domain created internally. */
+ mtk_mapping = data->mapping;
+ if (mtk_mapping->domain != domain)
+ return 0;
+
+ if (!data->m4u_dom) {
+ data->m4u_dom = dom;
+ ret = mtk_iommu_v1_domain_finalise(data);
+ if (ret) {
+ data->m4u_dom = NULL;
+ return ret;
+ }
+ }
+
+ mtk_iommu_v1_config(data, dev, true);
+ return 0;
+}
+
+static void mtk_iommu_v1_detach_device(struct iommu_domain *domain, struct device *dev)
+{
+ struct mtk_iommu_v1_data *data = dev_iommu_priv_get(dev);
+
+ mtk_iommu_v1_config(data, dev, false);
+}
+
+static int mtk_iommu_v1_map(struct iommu_domain *domain, unsigned long iova,
+ phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+{
+ struct mtk_iommu_v1_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_v1_tlb_flush_range(dom->data, iova, size);
+
+ return map_size == size ? 0 : -EEXIST;
+}
+
+static size_t mtk_iommu_v1_unmap(struct iommu_domain *domain, unsigned long iova,
+ size_t size, struct iommu_iotlb_gather *gather)
+{
+ struct mtk_iommu_v1_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_v1_tlb_flush_range(dom->data, iova, size);
+
+ return size;
+}
+
+static phys_addr_t mtk_iommu_v1_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
+{
+ struct mtk_iommu_v1_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 const struct iommu_ops mtk_iommu_v1_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_v1_create_mapping(struct device *dev, struct of_phandle_args *args)
+{
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+ struct mtk_iommu_v1_data *data;
+ struct platform_device *m4updev;
+ struct dma_iommu_mapping *mtk_mapping;
+ 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_v1_ops);
+ if (ret)
+ return ret;
+ fwspec = dev_iommu_fwspec_get(dev);
+ } else if (dev_iommu_fwspec_get(dev)->ops != &mtk_iommu_v1_ops) {
+ return -EINVAL;
+ }
+
+ if (!dev_iommu_priv_get(dev)) {
+ /* Get the m4u device */
+ m4updev = of_find_device_by_node(args->np);
+ if (WARN_ON(!m4updev))
+ return -EINVAL;
+
+ dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
+ }
+
+ ret = iommu_fwspec_add_ids(dev, args->args, 1);
+ if (ret)
+ return ret;
+
+ data = dev_iommu_priv_get(dev);
+ mtk_mapping = data->mapping;
+ 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);
+
+ data->mapping = mtk_mapping;
+ }
+
+ return 0;
+}
+
+static int mtk_iommu_v1_def_domain_type(struct device *dev)
+{
+ return IOMMU_DOMAIN_UNMANAGED;
+}
+
+static struct iommu_device *mtk_iommu_v1_probe_device(struct device *dev)
+{
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+ struct of_phandle_args iommu_spec;
+ struct mtk_iommu_v1_data *data;
+ int err, idx = 0, larbid, larbidx;
+ struct device_link *link;
+ struct device *larbdev;
+
+ /*
+ * In the deferred case, free the existed fwspec.
+ * Always initialize the fwspec internally.
+ */
+ if (fwspec) {
+ iommu_fwspec_free(dev);
+ fwspec = dev_iommu_fwspec_get(dev);
+ }
+
+ while (!of_parse_phandle_with_args(dev->of_node, "iommus",
+ "#iommu-cells",
+ idx, &iommu_spec)) {
+
+ err = mtk_iommu_v1_create_mapping(dev, &iommu_spec);
+ of_node_put(iommu_spec.np);
+ if (err)
+ return ERR_PTR(err);
+
+ /* dev->iommu_fwspec might have changed */
+ fwspec = dev_iommu_fwspec_get(dev);
+ idx++;
+ }
+
+ if (!fwspec || fwspec->ops != &mtk_iommu_v1_ops)
+ return ERR_PTR(-ENODEV); /* Not a iommu client device */
+
+ data = dev_iommu_priv_get(dev);
+
+ /* Link the consumer device with the smi-larb device(supplier) */
+ larbid = mt2701_m4u_to_larb(fwspec->ids[0]);
+ if (larbid >= MT2701_LARB_NR_MAX)
+ return ERR_PTR(-EINVAL);
+
+ for (idx = 1; idx < fwspec->num_ids; idx++) {
+ larbidx = mt2701_m4u_to_larb(fwspec->ids[idx]);
+ if (larbid != larbidx) {
+ dev_err(dev, "Can only use one larb. Fail@larb%d-%d.\n",
+ larbid, larbidx);
+ return ERR_PTR(-EINVAL);
+ }
+ }
+
+ larbdev = data->larb_imu[larbid].dev;
+ if (!larbdev)
+ return ERR_PTR(-EINVAL);
+
+ link = device_link_add(dev, larbdev,
+ DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
+ if (!link)
+ dev_err(dev, "Unable to link %s\n", dev_name(larbdev));
+
+ return &data->iommu;
+}
+
+static void mtk_iommu_v1_probe_finalize(struct device *dev)
+{
+ struct dma_iommu_mapping *mtk_mapping;
+ struct mtk_iommu_v1_data *data;
+ int err;
+
+ data = dev_iommu_priv_get(dev);
+ mtk_mapping = data->mapping;
+
+ err = arm_iommu_attach_device(dev, mtk_mapping);
+ if (err)
+ dev_err(dev, "Can't create IOMMU mapping - DMA-OPS will not work\n");
+}
+
+static void mtk_iommu_v1_release_device(struct device *dev)
+{
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+ struct mtk_iommu_v1_data *data;
+ struct device *larbdev;
+ unsigned int larbid;
+
+ data = dev_iommu_priv_get(dev);
+ larbid = mt2701_m4u_to_larb(fwspec->ids[0]);
+ larbdev = data->larb_imu[larbid].dev;
+ device_link_remove(dev, larbdev);
+}
+
+static int mtk_iommu_v1_hw_init(const struct mtk_iommu_v1_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_v1_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_v1_ops = {
+ .domain_alloc = mtk_iommu_v1_domain_alloc,
+ .probe_device = mtk_iommu_v1_probe_device,
+ .probe_finalize = mtk_iommu_v1_probe_finalize,
+ .release_device = mtk_iommu_v1_release_device,
+ .def_domain_type = mtk_iommu_v1_def_domain_type,
+ .device_group = generic_device_group,
+ .pgsize_bitmap = ~0UL << MT2701_IOMMU_PAGE_SHIFT,
+ .owner = THIS_MODULE,
+ .default_domain_ops = &(const struct iommu_domain_ops) {
+ .attach_dev = mtk_iommu_v1_attach_device,
+ .detach_dev = mtk_iommu_v1_detach_device,
+ .map = mtk_iommu_v1_map,
+ .unmap = mtk_iommu_v1_unmap,
+ .iova_to_phys = mtk_iommu_v1_iova_to_phys,
+ .free = mtk_iommu_v1_domain_free,
+ }
+};
+
+static const struct of_device_id mtk_iommu_v1_of_ids[] = {
+ { .compatible = "mediatek,mt2701-m4u", },
+ {}
+};
+
+static const struct component_master_ops mtk_iommu_v1_com_ops = {
+ .bind = mtk_iommu_v1_bind,
+ .unbind = mtk_iommu_v1_unbind,
+};
+
+static int mtk_iommu_v1_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mtk_iommu_v1_data *data;
+ 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 -ENODEV;
+ }
+ if (!plarbdev->dev.driver) {
+ of_node_put(larbnode);
+ return -EPROBE_DEFER;
+ }
+ data->larb_imu[i].dev = &plarbdev->dev;
+
+ component_match_add_release(dev, &match, component_release_of,
+ component_compare_of, larbnode);
+ }
+
+ platform_set_drvdata(pdev, data);
+
+ ret = mtk_iommu_v1_hw_init(data);
+ if (ret)
+ return ret;
+
+ ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
+ dev_name(&pdev->dev));
+ if (ret)
+ goto out_clk_unprepare;
+
+ ret = iommu_device_register(&data->iommu, &mtk_iommu_v1_ops, dev);
+ if (ret)
+ goto out_sysfs_remove;
+
+ ret = component_master_add_with_match(dev, &mtk_iommu_v1_com_ops, match);
+ if (ret)
+ goto out_dev_unreg;
+ return ret;
+
+out_dev_unreg:
+ iommu_device_unregister(&data->iommu);
+out_sysfs_remove:
+ iommu_device_sysfs_remove(&data->iommu);
+out_clk_unprepare:
+ clk_disable_unprepare(data->bclk);
+ return ret;
+}
+
+static int mtk_iommu_v1_remove(struct platform_device *pdev)
+{
+ struct mtk_iommu_v1_data *data = platform_get_drvdata(pdev);
+
+ iommu_device_sysfs_remove(&data->iommu);
+ iommu_device_unregister(&data->iommu);
+
+ clk_disable_unprepare(data->bclk);
+ devm_free_irq(&pdev->dev, data->irq, data);
+ component_master_del(&pdev->dev, &mtk_iommu_v1_com_ops);
+ return 0;
+}
+
+static int __maybe_unused mtk_iommu_v1_suspend(struct device *dev)
+{
+ struct mtk_iommu_v1_data *data = dev_get_drvdata(dev);
+ struct mtk_iommu_v1_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_v1_resume(struct device *dev)
+{
+ struct mtk_iommu_v1_data *data = dev_get_drvdata(dev);
+ struct mtk_iommu_v1_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_v1_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(mtk_iommu_v1_suspend, mtk_iommu_v1_resume)
+};
+
+static struct platform_driver mtk_iommu_v1_driver = {
+ .probe = mtk_iommu_v1_probe,
+ .remove = mtk_iommu_v1_remove,
+ .driver = {
+ .name = "mtk-iommu-v1",
+ .of_match_table = mtk_iommu_v1_of_ids,
+ .pm = &mtk_iommu_v1_pm_ops,
+ }
+};
+module_platform_driver(mtk_iommu_v1_driver);
+
+MODULE_DESCRIPTION("IOMMU API for MediaTek M4U v1 implementations");
+MODULE_LICENSE("GPL v2");