Message-ID: <1431683009-18158-6-git-send-email-yong.wu@mediatek.com>
Date:	Fri, 15 May 2015 17:43:28 +0800
From:	Yong Wu <yong.wu@...iatek.com>
To:	Rob Herring <robh+dt@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Matthias Brugger <matthias.bgg@...il.com>
CC:	Robin Murphy <robin.murphy@....com>,
	Will Deacon <will.deacon@....com>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Tomasz Figa <tfiga@...gle.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	<linux-mediatek@...ts.infradead.org>,
	Sasha Hauer <kernel@...gutronix.de>,
	<srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<iommu@...ts.linux-foundation.org>, <pebolle@...cali.nl>,
	<arnd@...db.de>, <mitchelh@...eaurora.org>, <k.zhang@...iatek.com>,
	<youhua.li@...iatek.com>, Yong Wu <yong.wu@...iatek.com>
Subject: [PATCH v2 5/6] iommu/mediatek: Add mt8173 IOMMU driver

This patch adds support for mediatek m4u (MultiMedia Memory Management Unit).

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/iommu/Kconfig     |  11 +
 drivers/iommu/Makefile    |   1 +
 drivers/iommu/mtk_iommu.c | 657 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 669 insertions(+)
 create mode 100644 drivers/iommu/mtk_iommu.c

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 3d2eac6..da83704 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -359,4 +359,15 @@ config ARM_SMMU
 	  Say Y here if your SoC includes an IOMMU device implementing
 	  the ARM SMMU architecture.
 
+config MTK_IOMMU
+	bool "MTK IOMMU Support"
+	select IOMMU_API
+	select IOMMU_DMA
+	select IOMMU_IO_PGTABLE_SHORT
+	select MTK_SMI
+	help
+	  Support for the IOMMUs on certain Mediatek SOCs.
+
+	  If unsure, say N here.
+
 endif # IOMMU_SUPPORT
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 815b3c8..3224d29 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
 obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o
 obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o
 obj-$(CONFIG_ROCKCHIP_IOMMU) += rockchip-iommu.o
+obj-$(CONFIG_MTK_IOMMU) += mtk_iommu.o
 obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
 obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
 obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
new file mode 100644
index 0000000..378e53e
--- /dev/null
+++ b/drivers/iommu/mtk_iommu.c
@@ -0,0 +1,657 @@
+/*
+ * Copyright (c) 2014-2015 MediaTek Inc.
+ * Author: Yong Wu <yong.wu@...iatek.com>
+ *
+ * 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 <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/iommu.h>
+#include <linux/of_iommu.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma-iommu.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+#include <linux/iopoll.h>
+#include <linux/mtk-smi.h>
+#include <asm/cacheflush.h>
+
+#include "io-pgtable.h"
+
+#define REG_MMU_PT_BASE_ADDR			0x000
+
+#define REG_MMU_INVALIDATE			0x020
+#define F_ALL_INVLD				0x2
+#define F_MMU_INV_RANGE				0x1
+
+#define REG_MMU_INVLD_START_A			0x024
+#define REG_MMU_INVLD_END_A			0x028
+
+#define REG_MMU_INV_SEL				0x038
+#define F_INVLD_EN0				BIT(0)
+#define F_INVLD_EN1				BIT(1)
+
+#define REG_MMU_STANDARD_AXI_MODE		0x048
+#define REG_MMU_DCM_DIS				0x050
+
+#define REG_MMU_CTRL_REG			0x110
+#define F_MMU_PREFETCH_RT_REPLACE_MOD		BIT(4)
+#define F_MMU_TF_PROTECT_SEL(prot)		(((prot) & 0x3) << 5)
+#define F_COHERENCE_EN				BIT(8)
+
+#define REG_MMU_IVRP_PADDR			0x114
+#define F_MMU_IVRP_PA_SET(pa)			((pa) >> 1)
+
+#define REG_MMU_INT_CONTROL0			0x120
+#define F_L2_MULIT_HIT_EN			BIT(0)
+#define F_TABLE_WALK_FAULT_INT_EN		BIT(1)
+#define F_PREETCH_FIFO_OVERFLOW_INT_EN		BIT(2)
+#define F_MISS_FIFO_OVERFLOW_INT_EN		BIT(3)
+#define F_PREFETCH_FIFO_ERR_INT_EN		BIT(5)
+#define F_MISS_FIFO_ERR_INT_EN			BIT(6)
+#define F_INT_L2_CLR_BIT			BIT(12)
+
+#define REG_MMU_INT_MAIN_CONTROL		0x124
+#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_TLB_MISS_FAULT			BIT(4)
+#define F_INT_MISS_TRANSATION_FIFO_FAULT	BIT(5)
+#define F_INT_PRETETCH_TRANSATION_FIFO_FAULT	BIT(6)
+
+#define REG_MMU_CPE_DONE			0x12C
+
+#define REG_MMU_FAULT_ST1			0x134
+
+#define REG_MMU_FAULT_VA			0x13c
+#define F_MMU_FAULT_VA_MSK			0xfffff000
+#define F_MMU_FAULT_VA_WRITE_BIT		BIT(1)
+#define F_MMU_FAULT_VA_LAYER_BIT		BIT(0)
+
+#define REG_MMU_INVLD_PA			0x140
+#define REG_MMU_INT_ID				0x150
+#define F_MMU0_INT_ID_LARB_ID(a)		(((a) >> 7) & 0x7)
+#define F_MMU0_INT_ID_PORT_ID(a)		(((a) >> 2) & 0x1f)
+
+#define MTK_PROTECT_PA_ALIGN			(128)
+
+#define MTK_IOMMU_LARB_MAX_NR			8
+
+struct mtk_iommu_info {
+	void __iomem		*base;
+	int			irq;
+	struct device		*dev;
+	struct device		*larbdev[MTK_IOMMU_LARB_MAX_NR];
+	struct clk		*bclk;
+	dma_addr_t		protect_base; /* protect memory base */
+	unsigned int		larb_nr;      /* local arbiter number */
+	unsigned int		larb_portid_base[MTK_IOMMU_LARB_MAX_NR];
+				/* the port id base for each local arbiter */
+};
+
+struct mtk_iommu_domain {
+	struct imu_pgd_t	*pgd;
+	spinlock_t		pgtlock;    /* lock for modifying page table */
+
+	struct io_pgtable_cfg   cfg;
+	struct io_pgtable_ops   *iop;
+
+	struct mtk_iommu_info   *imuinfo;
+	struct iommu_domain	domain;
+};
+
+static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
+{
+	return container_of(dom, struct mtk_iommu_domain, domain);
+}
+
+static void mtk_iommu_clear_intr(void __iomem *m4u_base)
+{
+	u32 val;
+
+	val = readl(m4u_base + REG_MMU_INT_CONTROL0);
+	val |= F_INT_L2_CLR_BIT;
+	writel(val, m4u_base + REG_MMU_INT_CONTROL0);
+}
+
+static void mtk_iommu_tlb_flush_all(void *cookie)
+{
+	struct mtk_iommu_domain *domain = cookie;
+	u32 val;
+
+	val = F_INVLD_EN1 | F_INVLD_EN0;
+	writel(val, domain->imuinfo->base + REG_MMU_INV_SEL);
+	writel(F_ALL_INVLD, domain->imuinfo->base + REG_MMU_INVALIDATE);
+}
+
+static void mtk_iommu_tlb_add_flush(unsigned long iova, size_t size,
+				    bool leaf, void *cookie)
+{
+	struct mtk_iommu_domain *domain = cookie;
+	void __iomem *m4u_base = domain->imuinfo->base;
+	unsigned int iova_start = iova, iova_end = iova + size - 1;
+	int ret;
+	u32 val;
+
+	val = F_INVLD_EN1 | F_INVLD_EN0;
+	writel(val, m4u_base + REG_MMU_INV_SEL);
+
+	writel(iova_start, m4u_base + REG_MMU_INVLD_START_A);
+	writel(iova_end, m4u_base + REG_MMU_INVLD_END_A);
+	writel(F_MMU_INV_RANGE, m4u_base + REG_MMU_INVALIDATE);
+
+	ret = readl_poll_timeout_atomic(m4u_base + REG_MMU_CPE_DONE, val,
+					val != 0, 10, 1000000);
+	if (ret) {
+		dev_warn(domain->imuinfo->dev, "Invalid tlb don't done\n");
+		mtk_iommu_tlb_flush_all(cookie);
+	}
+	writel(0, m4u_base + REG_MMU_CPE_DONE);
+}
+
+static void mtk_iommu_flush_pgtable(void *ptr, size_t size, void *cookie)
+{
+	/*
+	 * After delete arch_setup_dma_ops,
+	 * This will be replaced with dma_map_page
+	 */
+	 __dma_flush_range(ptr, ptr + size);
+}
+
+static struct iommu_gather_ops mtk_iommu_gather_ops = {
+	.tlb_flush_all = mtk_iommu_tlb_flush_all,
+	.tlb_add_flush = mtk_iommu_tlb_add_flush,
+	.tlb_sync = mtk_iommu_tlb_flush_all,
+	.flush_pgtable = mtk_iommu_flush_pgtable,
+};
+
+static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
+{
+	struct mtk_iommu_domain *mtkdomain = dev_id;
+	struct mtk_iommu_info *piommu = mtkdomain->imuinfo;
+	struct device *dev = piommu->dev;
+	void __iomem *m4u_base = piommu->base;
+	u32 int_state, regval, fault_iova, fault_pa;
+	unsigned int fault_larb, fault_port;
+	bool layer, write;
+
+	int_state = readl(m4u_base + REG_MMU_FAULT_ST1);
+
+	/* read error info from registers */
+	fault_iova = readl(m4u_base + REG_MMU_FAULT_VA);
+	layer = fault_iova & F_MMU_FAULT_VA_LAYER_BIT;
+	write = fault_iova & F_MMU_FAULT_VA_WRITE_BIT;
+	fault_iova &= F_MMU_FAULT_VA_MSK;
+	fault_pa = readl(m4u_base + REG_MMU_INVLD_PA);
+	regval = readl(m4u_base + REG_MMU_INT_ID);
+	fault_larb = F_MMU0_INT_ID_LARB_ID(regval);
+	fault_port = F_MMU0_INT_ID_PORT_ID(regval);
+
+	report_iommu_fault(&mtkdomain->domain, dev, fault_iova,
+			   write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ);
+
+	if (int_state & F_INT_TRANSLATION_FAULT) {
+		dev_err_ratelimited(
+			dev,
+			"fault:iova=0x%x pa=0x%x larb=%d port=%d layer=%d %s\n",
+			fault_iova, fault_pa, fault_larb, fault_port,
+			layer, write ? "write" : "read");
+	}
+
+	if (int_state & F_INT_MAIN_MULTI_HIT_FAULT)
+		dev_err_ratelimited(dev,
+				    "multi-hit!iova=0x%x larb=%d port=%d\n",
+				    fault_iova, fault_larb, fault_port);
+
+	if (int_state & F_INT_INVALID_PA_FAULT) {
+		if (!(int_state & F_INT_TRANSLATION_FAULT))
+			dev_err_ratelimited(
+				dev,
+				"invalid pa!iova=0x%x larb=%d port=%d\n",
+				fault_iova, fault_larb, fault_port);
+	}
+	if (int_state & F_INT_ENTRY_REPLACEMENT_FAULT)
+		dev_err_ratelimited(dev,
+				    "replace-fault!iova=0x%x larb=%d port=%d\n",
+				    fault_iova, fault_larb, fault_port);
+
+	if (int_state & F_INT_TLB_MISS_FAULT)
+		dev_err_ratelimited(dev,
+				    "tlb miss-fault!iova=0x%x larb=%d port=%d\n",
+				    fault_iova, fault_larb, fault_port);
+
+	mtk_iommu_tlb_flush_all(mtkdomain);
+
+	mtk_iommu_clear_intr(m4u_base);
+
+	return IRQ_HANDLED;
+}
+
+static int mtk_iommu_parse_dt(struct platform_device *pdev,
+			      struct mtk_iommu_info *piommu)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *ofnode;
+	struct resource *res;
+	unsigned int i, port_nr, lastportnr = 0;
+	int ret;
+
+	ofnode = dev->of_node;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	piommu->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(piommu->base)) {
+		dev_err(dev, "Failed to get base (%lx)\n",
+			PTR_ERR(piommu->base));
+		ret = PTR_ERR(piommu->base);
+		goto err_parse_dt;
+	}
+
+	piommu->irq = platform_get_irq(pdev, 0);
+	if (piommu->irq < 0) {
+		dev_err(dev, "Failed to get IRQ (%d)\n", piommu->irq);
+		ret = piommu->irq;
+		goto err_parse_dt;
+	}
+
+	piommu->bclk = devm_clk_get(dev, "bclk");
+	if (IS_ERR(piommu->bclk)) {
+		dev_err(dev, "Failed to get the bclk (%lx)\n",
+			PTR_ERR(piommu->bclk));
+		ret = PTR_ERR(piommu->bclk);
+		goto err_parse_dt;
+	}
+
+	ret = of_property_count_u32_elems(ofnode, "larb-portes-nr");
+	if (ret < 0) {
+		dev_err(dev, "Failed to get larb-portes-nr\n");
+		goto err_parse_dt;
+	} else {
+		piommu->larb_nr = ret;
+	}
+
+	for (i = 0; i < piommu->larb_nr; i++) {
+		ret = of_property_read_u32_index(ofnode, "larb-portes-nr",
+						 i, &port_nr);
+		if (ret) {
+			dev_err(dev, "Failed to get the port nr@...b%d\n", i);
+			goto err_parse_dt;
+		} else {
+			piommu->larb_portid_base[i] = lastportnr;
+			lastportnr += port_nr;
+		}
+	}
+	piommu->larb_portid_base[i] = lastportnr;
+
+	for (i = 0; i < piommu->larb_nr; i++) {
+		struct device_node *larbnode;
+		struct platform_device *plarbdev;
+
+		larbnode = of_parse_phandle(ofnode, "larb", i);
+		if (!larbnode) {
+			dev_err(dev, "Failed to get the larb property\n");
+			ret = -EINVAL;
+			goto err_parse_dt;
+		}
+		plarbdev = of_find_device_by_node(larbnode);
+		of_node_put(larbnode);
+		if (!plarbdev) {
+			dev_err(dev, "Failed to get the dev@...b%d\n", i);
+			ret = -EINVAL;
+			goto err_parse_dt;
+		} else {
+			piommu->larbdev[i] = &plarbdev->dev;
+		}
+	}
+
+	return 0;
+
+err_parse_dt:
+	return ret;
+}
+
+static int mtk_iommu_hw_init(const struct mtk_iommu_domain *mtkdomain)
+{
+	struct mtk_iommu_info *piommu = mtkdomain->imuinfo;
+	void __iomem *m4u_base = piommu->base;
+	u32 regval;
+	int ret = 0;
+
+	ret = clk_prepare_enable(piommu->bclk);
+	if (ret)
+		return -ENODEV;
+
+	writel(mtkdomain->cfg.arm_short_cfg.ttbr[0],
+	       m4u_base + REG_MMU_PT_BASE_ADDR);
+
+	regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
+		F_MMU_TF_PROTECT_SEL(2) |
+		F_COHERENCE_EN;
+	writel(regval, m4u_base + REG_MMU_CTRL_REG);
+
+	regval = F_L2_MULIT_HIT_EN |
+		F_TABLE_WALK_FAULT_INT_EN |
+		F_PREETCH_FIFO_OVERFLOW_INT_EN |
+		F_MISS_FIFO_OVERFLOW_INT_EN |
+		F_PREFETCH_FIFO_ERR_INT_EN |
+		F_MISS_FIFO_ERR_INT_EN;
+	writel(regval, m4u_base + REG_MMU_INT_CONTROL0);
+
+	regval = F_INT_TRANSLATION_FAULT |
+		F_INT_MAIN_MULTI_HIT_FAULT |
+		F_INT_INVALID_PA_FAULT |
+		F_INT_ENTRY_REPLACEMENT_FAULT |
+		F_INT_TLB_MISS_FAULT |
+		F_INT_MISS_TRANSATION_FIFO_FAULT |
+		F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
+	writel(regval, m4u_base + REG_MMU_INT_MAIN_CONTROL);
+
+	regval = ALIGN(piommu->protect_base, MTK_PROTECT_PA_ALIGN);
+	regval = (u32)F_MMU_IVRP_PA_SET(regval);
+	writel(regval, m4u_base + REG_MMU_IVRP_PADDR);
+
+	writel(0, m4u_base + REG_MMU_DCM_DIS);
+	writel(0, m4u_base + REG_MMU_STANDARD_AXI_MODE);
+
+	if (devm_request_irq(piommu->dev, piommu->irq, mtk_iommu_isr, 0,
+			     dev_name(piommu->dev), (void *)mtkdomain)) {
+		dev_err(piommu->dev, "Failed @ IRQ-%d Request\n", piommu->irq);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int mtk_iommu_config_port(struct mtk_iommu_info *piommu,
+				 int portid, bool iommuen)
+{
+	bool validlarb = false;
+	int i, larbid, larbportid;
+	int ret;
+
+	if (portid >= piommu->larb_portid_base[piommu->larb_nr]) {
+		dev_err(piommu->dev, "Invalid portid (%d)\n", portid);
+		return -EINVAL;
+	}
+
+	for (i = piommu->larb_nr - 1; i >= 0; i--) {
+		if (portid >= piommu->larb_portid_base[i]) {
+			larbid = i;
+			larbportid = portid -
+					piommu->larb_portid_base[i];
+			validlarb = true;
+			break;
+		}
+	}
+
+	if (validlarb) {
+		ret = mtk_smi_config_port(piommu->larbdev[larbid],
+					  larbportid, iommuen);
+		if (ret) {
+			dev_err(piommu->dev,
+				"Failed to config port portid-%d\n", portid);
+		}
+	} else {
+		ret = -EINVAL;
+		dev_err(piommu->dev, "Failed to find out portid-%d\n", portid);
+	}
+	return ret;
+}
+
+static int mtk_iommu_dev_enable_iommu(struct mtk_iommu_info *imuinfo,
+				      struct device *dev, bool enable)
+{
+	struct of_phandle_args out_args = {0};
+	struct device *imudev = imuinfo->dev;
+	unsigned int i = 0;
+	int ret = 0;
+
+	while (!of_parse_phandle_with_args(dev->of_node, "iommus",
+					   "#iommu-cells", i++, &out_args)) {
+		if (out_args.np != imudev->of_node)
+			continue;
+		if (out_args.args_count != 1) {
+			dev_err(imudev,
+				"invalid #iommu-cells property for IOMMU\n");
+		}
+
+		dev_dbg(imudev, "%s iommu @ port:%d\n",
+			enable ? "enable" : "disable", out_args.args[0]);
+
+		ret = mtk_iommu_config_port(imuinfo, out_args.args[0], enable);
+		if (!ret)
+			dev->archdata.dma_ops = (enable) ?
+					imudev->archdata.dma_ops : NULL;
+		else
+			break;
+	}
+	return ret;
+}
+
+static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
+{
+	struct mtk_iommu_domain *priv;
+
+	/* We only support unmanaged domains for now */
+	if (type != IOMMU_DOMAIN_UNMANAGED)
+		return NULL;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return ERR_PTR(-ENOMEM);
+
+	priv->cfg.quirks = IO_PGTABLE_QUIRK_ARM_NS;
+	priv->cfg.pgsize_bitmap = SZ_16M | SZ_1M | SZ_64K | SZ_4K,
+	priv->cfg.ias = 32;
+	priv->cfg.oas = 32;
+	priv->cfg.tlb = &mtk_iommu_gather_ops;
+
+	priv->iop = alloc_io_pgtable_ops(ARM_SHORT_DESC, &priv->cfg, priv);
+	if (!priv->iop) {
+		pr_err("Failed to alloc io pgtable@MTK iommu\n");
+		goto err_free_priv;
+	}
+
+	spin_lock_init(&priv->pgtlock);
+
+	priv->domain.geometry.aperture_start = 0;
+	priv->domain.geometry.aperture_end = ~0;
+	priv->domain.geometry.force_aperture = true;
+
+	return &priv->domain;
+
+err_free_priv:
+	kfree(priv);
+	return NULL;
+}
+
+static void mtk_iommu_domain_free(struct iommu_domain *domain)
+{
+	struct mtk_iommu_domain *priv = to_mtk_domain(domain);
+
+	free_io_pgtable_ops(priv->iop);
+	kfree(priv);
+}
+
+static int mtk_iommu_attach_device(struct iommu_domain *domain,
+				   struct device *dev)
+{
+	struct mtk_iommu_domain *priv = to_mtk_domain(domain);
+	int ret;
+
+	/* word around for arch_setup_dma_ops */
+	if (!priv->imuinfo)
+		ret = 0;
+	else
+		ret = mtk_iommu_dev_enable_iommu(priv->imuinfo, dev, true);
+	return ret;
+}
+
+static void mtk_iommu_detach_device(struct iommu_domain *domain,
+				    struct device *dev)
+{
+	struct mtk_iommu_domain *priv = to_mtk_domain(domain);
+
+	mtk_iommu_dev_enable_iommu(priv->imuinfo, 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 *priv = to_mtk_domain(domain);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&priv->pgtlock, flags);
+	ret = priv->iop->map(priv->iop, iova, paddr, size, prot);
+	spin_unlock_irqrestore(&priv->pgtlock, flags);
+
+	return ret;
+}
+
+static size_t mtk_iommu_unmap(struct iommu_domain *domain,
+			      unsigned long iova, size_t size)
+{
+	struct mtk_iommu_domain *priv = to_mtk_domain(domain);
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->pgtlock, flags);
+	priv->iop->unmap(priv->iop, iova, size);
+	spin_unlock_irqrestore(&priv->pgtlock, flags);
+
+	return size;
+}
+
+static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
+					  dma_addr_t iova)
+{
+	struct mtk_iommu_domain *priv = to_mtk_domain(domain);
+	unsigned long flags;
+	phys_addr_t pa;
+
+	spin_lock_irqsave(&priv->pgtlock, flags);
+	pa = priv->iop->iova_to_phys(priv->iop, iova);
+	spin_unlock_irqrestore(&priv->pgtlock, flags);
+
+	return pa;
+}
+
+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,
+	.map_sg = default_iommu_map_sg,
+	.iova_to_phys = mtk_iommu_iova_to_phys,
+	.pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
+};
+
+static const struct of_device_id mtk_iommu_of_ids[] = {
+	{ .compatible = "mediatek,mt8173-m4u",
+	},
+	{}
+};
+
+static int mtk_iommu_probe(struct platform_device *pdev)
+{
+	struct iommu_domain	*domain;
+	struct mtk_iommu_domain	*mtk_domain;
+	struct mtk_iommu_info	*piommu;
+	void __iomem		*protect;
+	int			ret;
+
+	piommu = devm_kzalloc(&pdev->dev, sizeof(*piommu), GFP_KERNEL);
+	if (!piommu)
+		return -ENOMEM;
+
+	piommu->dev = &pdev->dev;
+
+	/*
+	 * Alloc for Protect memory.
+	 * HW will access here while translation fault.
+	 */
+	protect = devm_kzalloc(piommu->dev, MTK_PROTECT_PA_ALIGN * 2,
+			       GFP_KERNEL);
+	if (!protect)
+		return -ENOMEM;
+	piommu->protect_base = dma_map_single(piommu->dev, protect,
+					      MTK_PROTECT_PA_ALIGN * 2,
+					      DMA_TO_DEVICE); /* clean cache */
+
+	ret = mtk_iommu_parse_dt(pdev, piommu);
+	if (ret)
+		return ret;
+
+	/*
+	 * arch_setup_dma_ops is not proper.
+	 * It should be replaced it with iommu_dma_create_domain
+	 * in next dma patch.
+	 */
+	arch_setup_dma_ops(piommu->dev, 0, (1ULL << 32) - 1, &mtk_iommu_ops, 0);
+
+	domain = iommu_dma_raw_domain(get_dma_domain(piommu->dev));
+	if (!domain) {
+		dev_err(piommu->dev, "Failed to get iommu domain\n");
+		ret = -EINVAL;
+		goto err_free_domain;
+	}
+
+	mtk_domain = to_mtk_domain(domain);
+	mtk_domain->imuinfo = piommu;
+
+	dev_set_drvdata(piommu->dev, piommu);
+
+	ret = mtk_iommu_hw_init(mtk_domain);
+	if (ret < 0) {
+		dev_err(piommu->dev, "Failed @ HW init\n");
+		goto err_free_domain;
+	}
+
+	return 0;
+
+err_free_domain:
+	arch_teardown_dma_ops(piommu->dev);
+	return ret;
+}
+
+static int mtk_iommu_remove(struct platform_device *pdev)
+{
+	struct mtk_iommu_info *piommu =	dev_get_drvdata(&pdev->dev);
+
+	arch_teardown_dma_ops(piommu->dev);
+
+	dma_unmap_single(piommu->dev, piommu->protect_base,
+			 MTK_PROTECT_PA_ALIGN * 2, DMA_TO_DEVICE);
+
+	return 0;
+}
+
+static struct platform_driver mtk_iommu_driver = {
+	.probe	= mtk_iommu_probe,
+	.remove	= mtk_iommu_remove,
+	.driver	= {
+		.name = "mtkiommu",
+		.of_match_table = mtk_iommu_of_ids,
+	}
+};
+
+static int __init mtk_iommu_init(void)
+{
+	return platform_driver_register(&mtk_iommu_driver);
+}
+
+subsys_initcall(mtk_iommu_init);
+
-- 
1.8.1.1.dirty

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