This patch adds support for mediatek m4u (MultiMedia Memory Management Unit). Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx> --- drivers/iommu/Kconfig | 13 + drivers/iommu/Makefile | 1 + drivers/iommu/mtk_iommu.c | 714 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 728 insertions(+) create mode 100644 drivers/iommu/mtk_iommu.c diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 3abd066..f0ae553e 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..3c4f1b5 --- /dev/null +++ b/drivers/iommu/mtk_iommu.c @@ -0,0 +1,714 @@ +/* + * Copyright (c) 2014-2015 MediaTek Inc. + * Author: Yong Wu <yong.wu@xxxxxxxxxxxx> + * + * 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_suspend_reg { + u32 standard_axi_mode; + u32 dcm_dis; + u32 ctrl_reg; + u32 ivrp_paddr; + u32 int_control0; + u32 int_main_control; +}; + +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 */ + struct mtk_iommu_suspend_reg reg; +}; + +struct mtk_iommu_domain { + struct imu_pgd_t *pgd; + spinlock_t pgtlock; /* lock for 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; +}; + +static struct iommu_ops mtk_iommu_ops; + +/* + * There is only one iommu domain called the m4u domain that + * all Multimedia modules share. + */ +static struct mtk_iommu_domain *m4udom; + +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_relaxed(data->base + REG_MMU_INT_CONTROL0); + val |= F_INT_L2_CLR_BIT; + writel_relaxed(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_relaxed(F_INVLD_EN1 | F_INVLD_EN0, base + REG_MMU_INV_SEL); + writel_relaxed(F_ALL_INVLD, base + REG_MMU_INVALIDATE); + mb();/* Make sure flush all done */ +} + +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_relaxed(F_INVLD_EN1 | F_INVLD_EN0, base + REG_MMU_INV_SEL); + + writel_relaxed(iova_start, base + REG_MMU_INVLD_START_A); + writel_relaxed(iova_end, base + REG_MMU_INVLD_END_A); + writel_relaxed(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_relaxed(0, base + REG_MMU_CPE_DONE); +} + +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, +}; + +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_relaxed(data->base + REG_MMU_FAULT_ST1); + + /* read error info from registers */ + fault_iova = readl_relaxed(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_relaxed(data->base + REG_MMU_INVLD_PA); + regval = readl_relaxed(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_clear_intr(data); + mtk_iommu_tlb_flush_all(mtkdom); + + 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_relaxed(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_relaxed(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_relaxed(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_relaxed(regval, base + REG_MMU_INT_MAIN_CONTROL); + + regval = ALIGN(data->protect_base, MTK_PROTECT_PA_ALIGN); + regval = F_MMU_IVRP_PA_SET(regval); + writel_relaxed(regval, base + REG_MMU_IVRP_PADDR); + + writel_relaxed(0, base + REG_MMU_DCM_DIS); + writel_relaxed(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_relaxed(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; + } + + mtk_smi_config_port(data->larbdev[cur->larbid], + cur->portid, enable); + if (!enable) { + list_del(&cur->client); + kfree(cur); + } + } + + if (!enable) { + kfree(head); + dev->archdata.iommu = NULL; + } + 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_NO_XN | + IO_PGTABLE_QUIRK_SHORT_NO_PERMS; + 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->cfg.iommu_dev = dom->data->dev; + + dom->iop = alloc_io_pgtable_ops(ARM_SHORT_DESC, &dom->cfg, dom); + if (!dom->iop) { + dev_err(dom->data->dev, "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; + + if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA) + return NULL; + + if (m4udom)/* The m4u domain exist. */ + return &m4udom->domain; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return NULL; + + priv->domain.geometry.aperture_start = 0; + priv->domain.geometry.aperture_end = DMA_BIT_MASK(32); + priv->domain.geometry.force_aperture = true; + + m4udom = priv; + + 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; + int ret; + + 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 iommu_group *group; + int ret; + + if (!dev->archdata.iommu) /* 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; + } + + ret = iommu_attach_group(&m4udom->domain, group); + if (ret) + dev_err(dev, "Failed to attach IOMMU group\n"); + +err_group_put: + iommu_group_put(group); + return ret; +} + +static void mtk_iommu_remove_device(struct device *dev) +{ + if (!dev->archdata.iommu) + return; + + iommu_group_remove_device(dev); +} + +static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args) +{ + struct mtk_iommu_client_priv *head, *priv, *next; + + 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) { + head = kzalloc(sizeof(*head), GFP_KERNEL); + if (!head) + return -ENOMEM; + + dev->archdata.iommu = head; + INIT_LIST_HEAD(&head->client); + } 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, + .remove_device = mtk_iommu_remove_device, + .of_xlate = mtk_iommu_of_xlate, + .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_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_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; + + if (!m4udom)/* There is no iommu client */ + return 0; + + data->dev = dev; + m4udom->data = data; + dev_set_drvdata(dev, m4udom); + + return 0; +} + +static int mtk_iommu_remove(struct platform_device *pdev) +{ + struct mtk_iommu_domain *mtkdom = dev_get_drvdata(&pdev->dev); + + if (!mtkdom) + return 0; + + free_io_pgtable_ops(mtkdom->iop); /* Destroy domain context */ + 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_suspend_reg *reg = &mtkdom->data->reg; + void __iomem *base = mtkdom->data->base; + + reg->standard_axi_mode = readl_relaxed(base + + REG_MMU_STANDARD_AXI_MODE); + reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM_DIS); + reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG); + reg->ivrp_paddr = readl_relaxed(base + REG_MMU_IVRP_PADDR); + reg->int_control0 = readl_relaxed(base + REG_MMU_INT_CONTROL0); + reg->int_main_control = readl_relaxed(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_suspend_reg *reg = &mtkdom->data->reg; + void __iomem *base = mtkdom->data->base; + + writel_relaxed(mtkdom->cfg.arm_short_cfg.ttbr[0], + 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_DIS); + writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG); + writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR); + writel_relaxed(reg->int_control0, base + REG_MMU_INT_CONTROL0); + writel_relaxed(reg->int_main_control, 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); -- 1.8.1.1.dirty -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html