[PATCH v3 5/6] iommu/mediatek: Add mt8173 IOMMU driver
Yong Wu
yong.wu at mediatek.com
Thu Jul 16 02:04:34 PDT 2015
This patch adds support for mediatek m4u (MultiMedia Memory Management
Unit).
Signed-off-by: Yong Wu <yong.wu at mediatek.com>
---
drivers/iommu/Kconfig | 13 +
drivers/iommu/Makefile | 1 +
drivers/iommu/mtk_iommu.c | 724 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 738 insertions(+)
create mode 100644 drivers/iommu/mtk_iommu.c
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index f50dbf3..3178c12 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -386,4 +386,17 @@ config ARM_SMMU_V3
Say Y here if your system includes an IOMMU device implementing
the ARM SMMUv3 architecture.
+config MTK_IOMMU
+ bool "MTK IOMMU Support"
+ depends on ARCH_MEDIATEK || COMPILE_TEST
+ select IOMMU_API
+ select IOMMU_DMA
+ select IOMMU_IO_PGTABLE_SHORT
+ select MEMORY
+ 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 06df3e6..f4f2f2c 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_ROCKCHIP_IOMMU) += rockchip-iommu.o
obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o
+obj-$(CONFIG_MTK_IOMMU) += mtk_iommu.o
obj-$(CONFIG_SHMOBILE_IOMMU) += shmobile-iommu.o
obj-$(CONFIG_SHMOBILE_IPMMU) += shmobile-ipmmu.o
obj-$(CONFIG_FSL_PAMU) += fsl_pamu.o fsl_pamu_domain.o
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
new file mode 100644
index 0000000..c1c90e6
--- /dev/null
+++ b/drivers/iommu/mtk_iommu.c
@@ -0,0 +1,724 @@
+/*
+ * Copyright (c) 2014-2015 MediaTek Inc.
+ * Author: Yong Wu <yong.wu at mediatek.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/dma-mapping.h>
+#include <linux/dma-iommu.h>
+#include <linux/of_iommu.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/list.h>
+#include <linux/clk.h>
+#include <linux/iopoll.h>
+#include <asm/cacheflush.h>
+#include <soc/mediatek/smi.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
+#define MTK_IOMMU_REG_NR 10
+
+struct mtk_iommu_data {
+ void __iomem *base;
+ int irq;
+ struct device *dev;
+ struct device *larbdev[MTK_IOMMU_LARB_MAX_NR];
+ struct clk *bclk;
+ phys_addr_t protect_base; /* protect memory base */
+ int larb_nr; /* local arbiter number */
+ u32 reg[MTK_IOMMU_REG_NR];
+};
+
+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_data *data;
+ struct iommu_domain domain;
+};
+
+struct mtk_iommu_client_priv {
+ struct list_head client;
+ unsigned int larbid;
+ unsigned int portid;
+ struct device *imudev;
+};
+
+static struct iommu_ops mtk_iommu_ops;
+
+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(const struct mtk_iommu_data *data)
+{
+ u32 val;
+
+ val = readl(data->base + REG_MMU_INT_CONTROL0);
+ val |= F_INT_L2_CLR_BIT;
+ writel(val, data->base + REG_MMU_INT_CONTROL0);
+}
+
+static void mtk_iommu_tlb_flush_all(void *cookie)
+{
+ struct mtk_iommu_domain *domain = cookie;
+ void __iomem *base;
+
+ base = domain->data->base;
+ writel(F_INVLD_EN1 | F_INVLD_EN0, base + REG_MMU_INV_SEL);
+ writel(F_ALL_INVLD, 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 *base = domain->data->base;
+ unsigned int iova_start = iova, iova_end = iova + size - 1;
+
+ writel(F_INVLD_EN1 | F_INVLD_EN0, base + REG_MMU_INV_SEL);
+
+ writel(iova_start, base + REG_MMU_INVLD_START_A);
+ writel(iova_end, base + REG_MMU_INVLD_END_A);
+ writel(F_MMU_INV_RANGE, base + REG_MMU_INVALIDATE);
+}
+
+static void mtk_iommu_tlb_sync(void *cookie)
+{
+ struct mtk_iommu_domain *domain = cookie;
+ void __iomem *base = domain->data->base;
+ int ret;
+ u32 tmp;
+
+ ret = readl_poll_timeout_atomic(base + REG_MMU_CPE_DONE, tmp,
+ tmp != 0, 10, 1000000);
+ if (ret) {
+ dev_warn(domain->data->dev,
+ "Partial TLB flush timed out, falling back to full flush\n");
+ mtk_iommu_tlb_flush_all(cookie);
+ }
+ writel(0, base + REG_MMU_CPE_DONE);
+}
+
+static void mtk_iommu_flush_pgtable(void *ptr, size_t size, void *cookie)
+{
+ struct mtk_iommu_domain *domain = cookie;
+ unsigned long offset = (unsigned long)ptr & ~PAGE_MASK;
+
+ dma_map_page(domain->data->dev, virt_to_page(ptr), offset,
+ size, DMA_TO_DEVICE);
+}
+
+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_sync,
+ .flush_pgtable = mtk_iommu_flush_pgtable,
+};
+
+static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
+{
+ struct mtk_iommu_domain *mtkdom = dev_id;
+ struct mtk_iommu_data *data = mtkdom->data;
+ u32 int_state, regval, fault_iova, fault_pa;
+ unsigned int fault_larb, fault_port;
+ bool layer, write;
+
+ int_state = readl(data->base + REG_MMU_FAULT_ST1);
+
+ /* read error info from registers */
+ fault_iova = readl(data->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(data->base + REG_MMU_INVLD_PA);
+ regval = readl(data->base + REG_MMU_INT_ID);
+ fault_larb = F_MMU0_INT_ID_LARB_ID(regval);
+ fault_port = F_MMU0_INT_ID_PORT_ID(regval);
+
+ if (report_iommu_fault(&mtkdom->domain, data->dev, fault_iova,
+ write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) {
+ dev_err_ratelimited(
+ data->dev,
+ "fault type=0x%x iova=0x%x pa=0x%x larb=%d port=%d layer=%d %s\n",
+ int_state, fault_iova, fault_pa, fault_larb, fault_port,
+ layer, write ? "write" : "read");
+ }
+
+ mtk_iommu_tlb_flush_all(mtkdom);
+ mtk_iommu_clear_intr(data);
+
+ return IRQ_HANDLED;
+}
+
+static int mtk_iommu_parse_dt(struct platform_device *pdev,
+ struct mtk_iommu_data *data)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *ofnode;
+ struct resource *res;
+ int i;
+
+ ofnode = dev->of_node;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ data->base = devm_ioremap_resource(&pdev->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);
+
+ data->larb_nr = of_count_phandle_with_args(
+ ofnode, "mediatek,larb", NULL);
+ if (data->larb_nr < 0)
+ return data->larb_nr;
+
+ for (i = 0; i < data->larb_nr; i++) {
+ struct device_node *larbnode;
+ struct platform_device *plarbdev;
+
+ larbnode = of_parse_phandle(ofnode, "mediatek,larb", i);
+ if (!larbnode)
+ return -EINVAL;
+
+ plarbdev = of_find_device_by_node(larbnode);
+ of_node_put(larbnode);
+ if (!plarbdev)
+ return -EPROBE_DEFER;
+ data->larbdev[i] = &plarbdev->dev;
+ }
+
+ return 0;
+}
+
+static int mtk_iommu_hw_init(const struct mtk_iommu_domain *mtkdom)
+{
+ struct mtk_iommu_data *data = mtkdom->data;
+ void __iomem *base = data->base;
+ u32 regval;
+ int ret = 0;
+
+ ret = clk_prepare_enable(data->bclk);
+ if (ret) {
+ dev_err(data->dev, "Failed to enable iommu clk(%d)\n", ret);
+ return ret;
+ }
+
+ writel(mtkdom->cfg.arm_short_cfg.ttbr[0], base + REG_MMU_PT_BASE_ADDR);
+
+ regval = F_MMU_PREFETCH_RT_REPLACE_MOD |
+ F_MMU_TF_PROTECT_SEL(2) |
+ F_COHERENCE_EN;
+ writel(regval, 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, 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, base + REG_MMU_INT_MAIN_CONTROL);
+
+ regval = ALIGN(data->protect_base, MTK_PROTECT_PA_ALIGN);
+ regval = F_MMU_IVRP_PA_SET(regval);
+ writel(regval, base + REG_MMU_IVRP_PADDR);
+
+ writel(0, base + REG_MMU_DCM_DIS);
+ writel(0, base + REG_MMU_STANDARD_AXI_MODE);
+
+ if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
+ dev_name(data->dev), (void *)mtkdom)) {
+ writel(0, 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 int mtk_iommu_config(struct mtk_iommu_domain *mtkdom,
+ struct device *dev, bool enable)
+{
+ struct mtk_iommu_data *data = mtkdom->data;
+ struct mtk_iommu_client_priv *head, *cur, *next;
+
+ head = dev->archdata.iommu;
+ list_for_each_entry_safe(cur, next, &head->client, client) {
+ if (cur->larbid >= data->larb_nr) {
+ dev_err(data->dev, "Invalid larb:%d\n", cur->larbid);
+ return -EINVAL;
+ }
+
+ if (enable) {
+ mtk_smi_config_port(data->larbdev[cur->larbid],
+ cur->portid, true);
+ } else {
+ mtk_smi_config_port(data->larbdev[cur->larbid],
+ cur->portid, false);
+ list_del(&cur->client);
+ kfree(cur);
+ }
+ }
+
+ if (!enable)
+ kfree(head);
+ return 0;
+}
+
+static int mtk_iommu_init_domain_context(struct mtk_iommu_domain *dom)
+{
+ int ret;
+
+ if (dom->iop)
+ return 0;
+
+ spin_lock_init(&dom->pgtlock);
+ dom->cfg.quirks = IO_PGTABLE_QUIRK_ARM_NS |
+ IO_PGTABLE_QUIRK_SHORT_SUPERSECTION |
+ IO_PGTABLE_QUIRK_SHORT_MTK;
+ dom->cfg.pgsize_bitmap = mtk_iommu_ops.pgsize_bitmap,
+ dom->cfg.ias = 32;
+ dom->cfg.oas = 32;
+ dom->cfg.tlb = &mtk_iommu_gather_ops;
+
+ dom->iop = alloc_io_pgtable_ops(ARM_SHORT_DESC, &dom->cfg, dom);
+ if (!dom->iop) {
+ pr_err("Failed to alloc io pgtable\n");
+ return -EINVAL;
+ }
+
+ /* Update our support page sizes bitmap */
+ mtk_iommu_ops.pgsize_bitmap = dom->cfg.pgsize_bitmap;
+
+ ret = mtk_iommu_hw_init(dom);
+ if (ret)
+ free_io_pgtable_ops(dom->iop);
+
+ 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 NULL;
+
+ priv->domain.geometry.aperture_start = 0;
+ priv->domain.geometry.aperture_end = (1ULL << 32) - 1;
+ priv->domain.geometry.force_aperture = true;
+
+ return &priv->domain;
+}
+
+static void mtk_iommu_domain_free(struct iommu_domain *domain)
+{
+ kfree(to_mtk_domain(domain));
+}
+
+static int mtk_iommu_attach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct mtk_iommu_domain *priv = to_mtk_domain(domain);
+ struct iommu_group *group;
+ struct mtk_iommu_client_priv *devpriv;
+ struct device *imudev;
+ int ret;
+
+ devpriv = dev->archdata.iommu;
+ imudev = devpriv->imudev;
+
+ /*
+ * Reserve one iommu domain as the m4u domain which
+ * all Multimedia modules share and free the others.
+ */
+ if (!imudev->archdata.iommu)
+ imudev->archdata.iommu = priv;
+ else if (imudev->archdata.iommu != priv)
+ iommu_domain_free(domain);
+
+ group = iommu_group_get(dev);
+ if (!group)
+ return 0;
+ iommu_group_put(group);
+
+ ret = mtk_iommu_init_domain_context(priv);
+ if (ret)
+ return ret;
+
+ return mtk_iommu_config(priv, dev, true);;
+}
+
+static void mtk_iommu_detach_device(struct iommu_domain *domain,
+ struct device *dev)
+{
+ mtk_iommu_config(to_mtk_domain(domain), 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;
+ size_t unmapsize;
+
+ spin_lock_irqsave(&priv->pgtlock, flags);
+ unmapsize = priv->iop->unmap(priv->iop, iova, size);
+ spin_unlock_irqrestore(&priv->pgtlock, flags);
+
+ return unmapsize;
+}
+
+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 int mtk_iommu_add_device(struct device *dev)
+{
+ struct mtk_iommu_domain *mtkdom;
+ struct iommu_group *group;
+ struct mtk_iommu_client_priv *devhead;
+ int ret;
+
+ if (!dev->archdata.dma_ops)/* Not a iommu client device */
+ return -ENODEV;
+
+ group = iommu_group_get(dev);
+ if (!group) {
+ group = iommu_group_alloc();
+ if (IS_ERR(group)) {
+ dev_err(dev, "Failed to allocate IOMMU group\n");
+ return PTR_ERR(group);
+ }
+ }
+
+ ret = iommu_group_add_device(group, dev);
+ if (ret) {
+ dev_err(dev, "Failed to add IOMMU group\n");
+ goto err_group_put;
+ }
+
+ /* get the mtk_iommu_domain from the iommu device */
+ devhead = dev->archdata.iommu;
+ mtkdom = devhead->imudev->archdata.iommu;
+ ret = iommu_attach_group(&mtkdom->domain, group);
+ if (ret)
+ dev_err(dev, "Failed to attach IOMMU group\n");
+
+err_group_put:
+ iommu_group_put(group);
+ return ret;
+}
+
+int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
+{
+ struct mtk_iommu_client_priv *head, *priv, *next;
+ struct platform_device *imupdev;
+ struct device *imudev;
+
+ if (args->args_count != 2) {
+ dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n",
+ args->args_count);
+ return -EINVAL;
+ }
+
+ if (!dev->archdata.iommu) {
+ /* Get the iommu device */
+ imupdev = of_find_device_by_node(args->np);
+ of_node_put(args->np);
+ if (WARN_ON(!imupdev))
+ return -EINVAL;
+ imudev = &imupdev->dev;
+
+ head = kzalloc(sizeof(*head), GFP_KERNEL);
+ if (!head)
+ return -ENOMEM;
+
+ dev->archdata.iommu = head;
+ INIT_LIST_HEAD(&head->client);
+ head->imudev = imudev;
+ } else {
+ head = dev->archdata.iommu;
+ }
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ goto err_free_mem;
+
+ priv->larbid = args->args[0];
+ priv->portid = args->args[1];
+ list_add_tail(&priv->client, &head->client);
+
+ return 0;
+
+err_free_mem:
+ list_for_each_entry_safe(priv, next, &head->client, client)
+ kfree(priv);
+ kfree(head);
+ dev->archdata.iommu = NULL;
+ return -ENOMEM;
+}
+
+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,
+ .add_device = mtk_iommu_add_device,
+ .of_xlate = mtk_iommu_of_xlate,
+ .pgsize_bitmap = -1UL,
+};
+
+static const struct of_device_id mtk_iommu_of_ids[] = {
+ { .compatible = "mediatek,mt8173-m4u", },
+ {}
+};
+
+static int mtk_iommu_init_fn(struct device_node *np)
+{
+ struct platform_device *pdev;
+
+ pdev = of_platform_device_create(np, NULL, platform_bus_type.dev_root);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ of_iommu_set_ops(np, &mtk_iommu_ops);
+
+ return 0;
+}
+
+IOMMU_OF_DECLARE(mtkm4u, "mediatek,mt8173-m4u", mtk_iommu_init_fn);
+
+static int mtk_iommu_probe(struct platform_device *pdev)
+{
+ struct mtk_iommu_domain *mtkdom;
+ struct mtk_iommu_data *data;
+ struct device *dev = &pdev->dev;
+ void __iomem *protect;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* Protect memory. HW will access here while translation fault.*/
+ protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, GFP_KERNEL);
+ if (!protect)
+ return -ENOMEM;
+ data->protect_base = virt_to_phys(protect);
+
+ ret = mtk_iommu_parse_dt(pdev, data);
+ if (ret)
+ return ret;
+
+ mtkdom = dev->archdata.iommu;
+ if (!mtkdom)/* There is no iommu client device */
+ return 0;
+
+ mtkdom->data = data;
+ data->dev = dev;
+ dev_set_drvdata(dev, mtkdom);
+
+ return 0;
+}
+
+static int mtk_iommu_remove(struct platform_device *pdev)
+{
+ struct mtk_iommu_domain *mtkdom = dev_get_drvdata(&pdev->dev);
+
+ /* Destroy domain context */
+ free_io_pgtable_ops(mtkdom->iop);
+
+ clk_disable_unprepare(mtkdom->data->bclk);
+ return 0;
+}
+
+static int mtk_iommu_suspend(struct device *dev)
+{
+ struct mtk_iommu_domain *mtkdom = dev_get_drvdata(dev);
+ struct mtk_iommu_data *data = mtkdom->data;
+ void __iomem *base = data->base;
+ unsigned int i = 0;
+
+ data->reg[i++] = readl(base + REG_MMU_PT_BASE_ADDR);
+ data->reg[i++] = readl(base + REG_MMU_STANDARD_AXI_MODE);
+ data->reg[i++] = readl(base + REG_MMU_DCM_DIS);
+ data->reg[i++] = readl(base + REG_MMU_CTRL_REG);
+ data->reg[i++] = readl(base + REG_MMU_IVRP_PADDR);
+ data->reg[i++] = readl(base + REG_MMU_INT_CONTROL0);
+ data->reg[i++] = readl(base + REG_MMU_INT_MAIN_CONTROL);
+ return 0;
+}
+
+static int mtk_iommu_resume(struct device *dev)
+{
+ struct mtk_iommu_domain *mtkdom = dev_get_drvdata(dev);
+ struct mtk_iommu_data *data = mtkdom->data;
+ void __iomem *base = data->base;
+ unsigned int i = 0;
+
+ writel(data->reg[i++], base + REG_MMU_PT_BASE_ADDR);
+ writel(data->reg[i++], base + REG_MMU_STANDARD_AXI_MODE);
+ writel(data->reg[i++], base + REG_MMU_DCM_DIS);
+ writel(data->reg[i++], base + REG_MMU_CTRL_REG);
+ writel(data->reg[i++], base + REG_MMU_IVRP_PADDR);
+ writel(data->reg[i++], base + REG_MMU_INT_CONTROL0);
+ writel(data->reg[i++], base + REG_MMU_INT_MAIN_CONTROL);
+ return 0;
+}
+
+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",
+ .of_match_table = mtk_iommu_of_ids,
+ .pm = &mtk_iommu_pm_ops,
+ }
+};
+
+static int __init mtk_iommu_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&mtk_iommu_driver);
+ if (ret) {
+ pr_err("%s: Failed to register driver\n", __func__);
+ return ret;
+ }
+
+ if (!iommu_present(&platform_bus_type))
+ bus_set_iommu(&platform_bus_type, &mtk_iommu_ops);
+
+ return 0;
+}
+
+subsys_initcall(mtk_iommu_init);
--
1.7.9.5
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