Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1149 insertions, 0 deletions

diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
new file mode 100644
index 000000000..d8598e44e
--- /dev/null
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -0,0 +1,1149 @@
+/*
+ * IPMMU VMSA
+ *
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ */
+
+#include <linux/bitmap.h>
+#include <linux/delay.h>
+#include <linux/dma-iommu.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_iommu.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+
+#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
+#include <asm/dma-iommu.h>
+#include <asm/pgalloc.h>
+#else
+#define arm_iommu_create_mapping(...)	NULL
+#define arm_iommu_attach_device(...)	-ENODEV
+#define arm_iommu_release_mapping(...)	do {} while (0)
+#define arm_iommu_detach_device(...)	do {} while (0)
+#endif
+
+#include "io-pgtable.h"
+
+#define IPMMU_CTX_MAX 8
+
+struct ipmmu_features {
+	bool use_ns_alias_offset;
+	bool has_cache_leaf_nodes;
+	unsigned int number_of_contexts;
+	bool setup_imbuscr;
+	bool twobit_imttbcr_sl0;
+	bool reserved_context;
+};
+
+struct ipmmu_vmsa_device {
+	struct device *dev;
+	void __iomem *base;
+	struct iommu_device iommu;
+	struct ipmmu_vmsa_device *root;
+	const struct ipmmu_features *features;
+	unsigned int num_utlbs;
+	unsigned int num_ctx;
+	spinlock_t lock;			/* Protects ctx and domains[] */
+	DECLARE_BITMAP(ctx, IPMMU_CTX_MAX);
+	struct ipmmu_vmsa_domain *domains[IPMMU_CTX_MAX];
+
+	struct iommu_group *group;
+	struct dma_iommu_mapping *mapping;
+};
+
+struct ipmmu_vmsa_domain {
+	struct ipmmu_vmsa_device *mmu;
+	struct iommu_domain io_domain;
+
+	struct io_pgtable_cfg cfg;
+	struct io_pgtable_ops *iop;
+
+	unsigned int context_id;
+	struct mutex mutex;			/* Protects mappings */
+};
+
+static struct ipmmu_vmsa_domain *to_vmsa_domain(struct iommu_domain *dom)
+{
+	return container_of(dom, struct ipmmu_vmsa_domain, io_domain);
+}
+
+static struct ipmmu_vmsa_device *to_ipmmu(struct device *dev)
+{
+	return dev->iommu_fwspec ? dev->iommu_fwspec->iommu_priv : NULL;
+}
+
+#define TLB_LOOP_TIMEOUT		100	/* 100us */
+
+/* -----------------------------------------------------------------------------
+ * Registers Definition
+ */
+
+#define IM_NS_ALIAS_OFFSET		0x800
+
+#define IM_CTX_SIZE			0x40
+
+#define IMCTR				0x0000
+#define IMCTR_TRE			(1 << 17)
+#define IMCTR_AFE			(1 << 16)
+#define IMCTR_RTSEL_MASK		(3 << 4)
+#define IMCTR_RTSEL_SHIFT		4
+#define IMCTR_TREN			(1 << 3)
+#define IMCTR_INTEN			(1 << 2)
+#define IMCTR_FLUSH			(1 << 1)
+#define IMCTR_MMUEN			(1 << 0)
+
+#define IMCAAR				0x0004
+
+#define IMTTBCR				0x0008
+#define IMTTBCR_EAE			(1 << 31)
+#define IMTTBCR_PMB			(1 << 30)
+#define IMTTBCR_SH1_NON_SHAREABLE	(0 << 28)
+#define IMTTBCR_SH1_OUTER_SHAREABLE	(2 << 28)
+#define IMTTBCR_SH1_INNER_SHAREABLE	(3 << 28)
+#define IMTTBCR_SH1_MASK		(3 << 28)
+#define IMTTBCR_ORGN1_NC		(0 << 26)
+#define IMTTBCR_ORGN1_WB_WA		(1 << 26)
+#define IMTTBCR_ORGN1_WT		(2 << 26)
+#define IMTTBCR_ORGN1_WB		(3 << 26)
+#define IMTTBCR_ORGN1_MASK		(3 << 26)
+#define IMTTBCR_IRGN1_NC		(0 << 24)
+#define IMTTBCR_IRGN1_WB_WA		(1 << 24)
+#define IMTTBCR_IRGN1_WT		(2 << 24)
+#define IMTTBCR_IRGN1_WB		(3 << 24)
+#define IMTTBCR_IRGN1_MASK		(3 << 24)
+#define IMTTBCR_TSZ1_MASK		(7 << 16)
+#define IMTTBCR_TSZ1_SHIFT		16
+#define IMTTBCR_SH0_NON_SHAREABLE	(0 << 12)
+#define IMTTBCR_SH0_OUTER_SHAREABLE	(2 << 12)
+#define IMTTBCR_SH0_INNER_SHAREABLE	(3 << 12)
+#define IMTTBCR_SH0_MASK		(3 << 12)
+#define IMTTBCR_ORGN0_NC		(0 << 10)
+#define IMTTBCR_ORGN0_WB_WA		(1 << 10)
+#define IMTTBCR_ORGN0_WT		(2 << 10)
+#define IMTTBCR_ORGN0_WB		(3 << 10)
+#define IMTTBCR_ORGN0_MASK		(3 << 10)
+#define IMTTBCR_IRGN0_NC		(0 << 8)
+#define IMTTBCR_IRGN0_WB_WA		(1 << 8)
+#define IMTTBCR_IRGN0_WT		(2 << 8)
+#define IMTTBCR_IRGN0_WB		(3 << 8)
+#define IMTTBCR_IRGN0_MASK		(3 << 8)
+#define IMTTBCR_SL0_LVL_2		(0 << 4)
+#define IMTTBCR_SL0_LVL_1		(1 << 4)
+#define IMTTBCR_TSZ0_MASK		(7 << 0)
+#define IMTTBCR_TSZ0_SHIFT		O
+
+#define IMTTBCR_SL0_TWOBIT_LVL_3	(0 << 6)
+#define IMTTBCR_SL0_TWOBIT_LVL_2	(1 << 6)
+#define IMTTBCR_SL0_TWOBIT_LVL_1	(2 << 6)
+
+#define IMBUSCR				0x000c
+#define IMBUSCR_DVM			(1 << 2)
+#define IMBUSCR_BUSSEL_SYS		(0 << 0)
+#define IMBUSCR_BUSSEL_CCI		(1 << 0)
+#define IMBUSCR_BUSSEL_IMCAAR		(2 << 0)
+#define IMBUSCR_BUSSEL_CCI_IMCAAR	(3 << 0)
+#define IMBUSCR_BUSSEL_MASK		(3 << 0)
+
+#define IMTTLBR0			0x0010
+#define IMTTUBR0			0x0014
+#define IMTTLBR1			0x0018
+#define IMTTUBR1			0x001c
+
+#define IMSTR				0x0020
+#define IMSTR_ERRLVL_MASK		(3 << 12)
+#define IMSTR_ERRLVL_SHIFT		12
+#define IMSTR_ERRCODE_TLB_FORMAT	(1 << 8)
+#define IMSTR_ERRCODE_ACCESS_PERM	(4 << 8)
+#define IMSTR_ERRCODE_SECURE_ACCESS	(5 << 8)
+#define IMSTR_ERRCODE_MASK		(7 << 8)
+#define IMSTR_MHIT			(1 << 4)
+#define IMSTR_ABORT			(1 << 2)
+#define IMSTR_PF			(1 << 1)
+#define IMSTR_TF			(1 << 0)
+
+#define IMMAIR0				0x0028
+#define IMMAIR1				0x002c
+#define IMMAIR_ATTR_MASK		0xff
+#define IMMAIR_ATTR_DEVICE		0x04
+#define IMMAIR_ATTR_NC			0x44
+#define IMMAIR_ATTR_WBRWA		0xff
+#define IMMAIR_ATTR_SHIFT(n)		((n) << 3)
+#define IMMAIR_ATTR_IDX_NC		0
+#define IMMAIR_ATTR_IDX_WBRWA		1
+#define IMMAIR_ATTR_IDX_DEV		2
+
+#define IMEAR				0x0030
+
+#define IMPCTR				0x0200
+#define IMPSTR				0x0208
+#define IMPEAR				0x020c
+#define IMPMBA(n)			(0x0280 + ((n) * 4))
+#define IMPMBD(n)			(0x02c0 + ((n) * 4))
+
+#define IMUCTR(n)			((n) < 32 ? IMUCTR0(n) : IMUCTR32(n))
+#define IMUCTR0(n)			(0x0300 + ((n) * 16))
+#define IMUCTR32(n)			(0x0600 + (((n) - 32) * 16))
+#define IMUCTR_FIXADDEN			(1 << 31)
+#define IMUCTR_FIXADD_MASK		(0xff << 16)
+#define IMUCTR_FIXADD_SHIFT		16
+#define IMUCTR_TTSEL_MMU(n)		((n) << 4)
+#define IMUCTR_TTSEL_PMB		(8 << 4)
+#define IMUCTR_TTSEL_MASK		(15 << 4)
+#define IMUCTR_FLUSH			(1 << 1)
+#define IMUCTR_MMUEN			(1 << 0)
+
+#define IMUASID(n)			((n) < 32 ? IMUASID0(n) : IMUASID32(n))
+#define IMUASID0(n)			(0x0308 + ((n) * 16))
+#define IMUASID32(n)			(0x0608 + (((n) - 32) * 16))
+#define IMUASID_ASID8_MASK		(0xff << 8)
+#define IMUASID_ASID8_SHIFT		8
+#define IMUASID_ASID0_MASK		(0xff << 0)
+#define IMUASID_ASID0_SHIFT		0
+
+/* -----------------------------------------------------------------------------
+ * Root device handling
+ */
+
+static struct platform_driver ipmmu_driver;
+
+static bool ipmmu_is_root(struct ipmmu_vmsa_device *mmu)
+{
+	return mmu->root == mmu;
+}
+
+static int __ipmmu_check_device(struct device *dev, void *data)
+{
+	struct ipmmu_vmsa_device *mmu = dev_get_drvdata(dev);
+	struct ipmmu_vmsa_device **rootp = data;
+
+	if (ipmmu_is_root(mmu))
+		*rootp = mmu;
+
+	return 0;
+}
+
+static struct ipmmu_vmsa_device *ipmmu_find_root(void)
+{
+	struct ipmmu_vmsa_device *root = NULL;
+
+	return driver_for_each_device(&ipmmu_driver.driver, NULL, &root,
+				      __ipmmu_check_device) == 0 ? root : NULL;
+}
+
+/* -----------------------------------------------------------------------------
+ * Read/Write Access
+ */
+
+static u32 ipmmu_read(struct ipmmu_vmsa_device *mmu, unsigned int offset)
+{
+	return ioread32(mmu->base + offset);
+}
+
+static void ipmmu_write(struct ipmmu_vmsa_device *mmu, unsigned int offset,
+			u32 data)
+{
+	iowrite32(data, mmu->base + offset);
+}
+
+static u32 ipmmu_ctx_read_root(struct ipmmu_vmsa_domain *domain,
+			       unsigned int reg)
+{
+	return ipmmu_read(domain->mmu->root,
+			  domain->context_id * IM_CTX_SIZE + reg);
+}
+
+static void ipmmu_ctx_write_root(struct ipmmu_vmsa_domain *domain,
+				 unsigned int reg, u32 data)
+{
+	ipmmu_write(domain->mmu->root,
+		    domain->context_id * IM_CTX_SIZE + reg, data);
+}
+
+static void ipmmu_ctx_write_all(struct ipmmu_vmsa_domain *domain,
+				unsigned int reg, u32 data)
+{
+	if (domain->mmu != domain->mmu->root)
+		ipmmu_write(domain->mmu,
+			    domain->context_id * IM_CTX_SIZE + reg, data);
+
+	ipmmu_write(domain->mmu->root,
+		    domain->context_id * IM_CTX_SIZE + reg, data);
+}
+
+/* -----------------------------------------------------------------------------
+ * TLB and microTLB Management
+ */
+
+/* Wait for any pending TLB invalidations to complete */
+static void ipmmu_tlb_sync(struct ipmmu_vmsa_domain *domain)
+{
+	unsigned int count = 0;
+
+	while (ipmmu_ctx_read_root(domain, IMCTR) & IMCTR_FLUSH) {
+		cpu_relax();
+		if (++count == TLB_LOOP_TIMEOUT) {
+			dev_err_ratelimited(domain->mmu->dev,
+			"TLB sync timed out -- MMU may be deadlocked\n");
+			return;
+		}
+		udelay(1);
+	}
+}
+
+static void ipmmu_tlb_invalidate(struct ipmmu_vmsa_domain *domain)
+{
+	u32 reg;
+
+	reg = ipmmu_ctx_read_root(domain, IMCTR);
+	reg |= IMCTR_FLUSH;
+	ipmmu_ctx_write_all(domain, IMCTR, reg);
+
+	ipmmu_tlb_sync(domain);
+}
+
+/*
+ * Enable MMU translation for the microTLB.
+ */
+static void ipmmu_utlb_enable(struct ipmmu_vmsa_domain *domain,
+			      unsigned int utlb)
+{
+	struct ipmmu_vmsa_device *mmu = domain->mmu;
+
+	/*
+	 * TODO: Reference-count the microTLB as several bus masters can be
+	 * connected to the same microTLB.
+	 */
+
+	/* TODO: What should we set the ASID to ? */
+	ipmmu_write(mmu, IMUASID(utlb), 0);
+	/* TODO: Do we need to flush the microTLB ? */
+	ipmmu_write(mmu, IMUCTR(utlb),
+		    IMUCTR_TTSEL_MMU(domain->context_id) | IMUCTR_FLUSH |
+		    IMUCTR_MMUEN);
+}
+
+/*
+ * Disable MMU translation for the microTLB.
+ */
+static void ipmmu_utlb_disable(struct ipmmu_vmsa_domain *domain,
+			       unsigned int utlb)
+{
+	struct ipmmu_vmsa_device *mmu = domain->mmu;
+
+	ipmmu_write(mmu, IMUCTR(utlb), 0);
+}
+
+static void ipmmu_tlb_flush_all(void *cookie)
+{
+	struct ipmmu_vmsa_domain *domain = cookie;
+
+	ipmmu_tlb_invalidate(domain);
+}
+
+static void ipmmu_tlb_add_flush(unsigned long iova, size_t size,
+				size_t granule, bool leaf, void *cookie)
+{
+	/* The hardware doesn't support selective TLB flush. */
+}
+
+static const struct iommu_gather_ops ipmmu_gather_ops = {
+	.tlb_flush_all = ipmmu_tlb_flush_all,
+	.tlb_add_flush = ipmmu_tlb_add_flush,
+	.tlb_sync = ipmmu_tlb_flush_all,
+};
+
+/* -----------------------------------------------------------------------------
+ * Domain/Context Management
+ */
+
+static int ipmmu_domain_allocate_context(struct ipmmu_vmsa_device *mmu,
+					 struct ipmmu_vmsa_domain *domain)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&mmu->lock, flags);
+
+	ret = find_first_zero_bit(mmu->ctx, mmu->num_ctx);
+	if (ret != mmu->num_ctx) {
+		mmu->domains[ret] = domain;
+		set_bit(ret, mmu->ctx);
+	} else
+		ret = -EBUSY;
+
+	spin_unlock_irqrestore(&mmu->lock, flags);
+
+	return ret;
+}
+
+static void ipmmu_domain_free_context(struct ipmmu_vmsa_device *mmu,
+				      unsigned int context_id)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&mmu->lock, flags);
+
+	clear_bit(context_id, mmu->ctx);
+	mmu->domains[context_id] = NULL;
+
+	spin_unlock_irqrestore(&mmu->lock, flags);
+}
+
+static int ipmmu_domain_init_context(struct ipmmu_vmsa_domain *domain)
+{
+	u64 ttbr;
+	u32 tmp;
+	int ret;
+
+	/*
+	 * Allocate the page table operations.
+	 *
+	 * VMSA states in section B3.6.3 "Control of Secure or Non-secure memory
+	 * access, Long-descriptor format" that the NStable bit being set in a
+	 * table descriptor will result in the NStable and NS bits of all child
+	 * entries being ignored and considered as being set. The IPMMU seems
+	 * not to comply with this, as it generates a secure access page fault
+	 * if any of the NStable and NS bits isn't set when running in
+	 * non-secure mode.
+	 */
+	domain->cfg.quirks = IO_PGTABLE_QUIRK_ARM_NS;
+	domain->cfg.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K;
+	domain->cfg.ias = 32;
+	domain->cfg.oas = 40;
+	domain->cfg.tlb = &ipmmu_gather_ops;
+	domain->io_domain.geometry.aperture_end = DMA_BIT_MASK(32);
+	domain->io_domain.geometry.force_aperture = true;
+	/*
+	 * TODO: Add support for coherent walk through CCI with DVM and remove
+	 * cache handling. For now, delegate it to the io-pgtable code.
+	 */
+	domain->cfg.iommu_dev = domain->mmu->root->dev;
+
+	/*
+	 * Find an unused context.
+	 */
+	ret = ipmmu_domain_allocate_context(domain->mmu->root, domain);
+	if (ret < 0)
+		return ret;
+
+	domain->context_id = ret;
+
+	domain->iop = alloc_io_pgtable_ops(ARM_32_LPAE_S1, &domain->cfg,
+					   domain);
+	if (!domain->iop) {
+		ipmmu_domain_free_context(domain->mmu->root,
+					  domain->context_id);
+		return -EINVAL;
+	}
+
+	/* TTBR0 */
+	ttbr = domain->cfg.arm_lpae_s1_cfg.ttbr[0];
+	ipmmu_ctx_write_root(domain, IMTTLBR0, ttbr);
+	ipmmu_ctx_write_root(domain, IMTTUBR0, ttbr >> 32);
+
+	/*
+	 * TTBCR
+	 * We use long descriptors with inner-shareable WBWA tables and allocate
+	 * the whole 32-bit VA space to TTBR0.
+	 */
+	if (domain->mmu->features->twobit_imttbcr_sl0)
+		tmp = IMTTBCR_SL0_TWOBIT_LVL_1;
+	else
+		tmp = IMTTBCR_SL0_LVL_1;
+
+	ipmmu_ctx_write_root(domain, IMTTBCR, IMTTBCR_EAE |
+			     IMTTBCR_SH0_INNER_SHAREABLE | IMTTBCR_ORGN0_WB_WA |
+			     IMTTBCR_IRGN0_WB_WA | tmp);
+
+	/* MAIR0 */
+	ipmmu_ctx_write_root(domain, IMMAIR0,
+			     domain->cfg.arm_lpae_s1_cfg.mair[0]);
+
+	/* IMBUSCR */
+	if (domain->mmu->features->setup_imbuscr)
+		ipmmu_ctx_write_root(domain, IMBUSCR,
+				     ipmmu_ctx_read_root(domain, IMBUSCR) &
+				     ~(IMBUSCR_DVM | IMBUSCR_BUSSEL_MASK));
+
+	/*
+	 * IMSTR
+	 * Clear all interrupt flags.
+	 */
+	ipmmu_ctx_write_root(domain, IMSTR, ipmmu_ctx_read_root(domain, IMSTR));
+
+	/*
+	 * IMCTR
+	 * Enable the MMU and interrupt generation. The long-descriptor
+	 * translation table format doesn't use TEX remapping. Don't enable AF
+	 * software management as we have no use for it. Flush the TLB as
+	 * required when modifying the context registers.
+	 */
+	ipmmu_ctx_write_all(domain, IMCTR,
+			    IMCTR_INTEN | IMCTR_FLUSH | IMCTR_MMUEN);
+
+	return 0;
+}
+
+static void ipmmu_domain_destroy_context(struct ipmmu_vmsa_domain *domain)
+{
+	if (!domain->mmu)
+		return;
+
+	/*
+	 * Disable the context. Flush the TLB as required when modifying the
+	 * context registers.
+	 *
+	 * TODO: Is TLB flush really needed ?
+	 */
+	ipmmu_ctx_write_all(domain, IMCTR, IMCTR_FLUSH);
+	ipmmu_tlb_sync(domain);
+	ipmmu_domain_free_context(domain->mmu->root, domain->context_id);
+}
+
+/* -----------------------------------------------------------------------------
+ * Fault Handling
+ */
+
+static irqreturn_t ipmmu_domain_irq(struct ipmmu_vmsa_domain *domain)
+{
+	const u32 err_mask = IMSTR_MHIT | IMSTR_ABORT | IMSTR_PF | IMSTR_TF;
+	struct ipmmu_vmsa_device *mmu = domain->mmu;
+	u32 status;
+	u32 iova;
+
+	status = ipmmu_ctx_read_root(domain, IMSTR);
+	if (!(status & err_mask))
+		return IRQ_NONE;
+
+	iova = ipmmu_ctx_read_root(domain, IMEAR);
+
+	/*
+	 * Clear the error status flags. Unlike traditional interrupt flag
+	 * registers that must be cleared by writing 1, this status register
+	 * seems to require 0. The error address register must be read before,
+	 * otherwise its value will be 0.
+	 */
+	ipmmu_ctx_write_root(domain, IMSTR, 0);
+
+	/* Log fatal errors. */
+	if (status & IMSTR_MHIT)
+		dev_err_ratelimited(mmu->dev, "Multiple TLB hits @0x%08x\n",
+				    iova);
+	if (status & IMSTR_ABORT)
+		dev_err_ratelimited(mmu->dev, "Page Table Walk Abort @0x%08x\n",
+				    iova);
+
+	if (!(status & (IMSTR_PF | IMSTR_TF)))
+		return IRQ_NONE;
+
+	/*
+	 * Try to handle page faults and translation faults.
+	 *
+	 * TODO: We need to look up the faulty device based on the I/O VA. Use
+	 * the IOMMU device for now.
+	 */
+	if (!report_iommu_fault(&domain->io_domain, mmu->dev, iova, 0))
+		return IRQ_HANDLED;
+
+	dev_err_ratelimited(mmu->dev,
+			    "Unhandled fault: status 0x%08x iova 0x%08x\n",
+			    status, iova);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ipmmu_irq(int irq, void *dev)
+{
+	struct ipmmu_vmsa_device *mmu = dev;
+	irqreturn_t status = IRQ_NONE;
+	unsigned int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&mmu->lock, flags);
+
+	/*
+	 * Check interrupts for all active contexts.
+	 */
+	for (i = 0; i < mmu->num_ctx; i++) {
+		if (!mmu->domains[i])
+			continue;
+		if (ipmmu_domain_irq(mmu->domains[i]) == IRQ_HANDLED)
+			status = IRQ_HANDLED;
+	}
+
+	spin_unlock_irqrestore(&mmu->lock, flags);
+
+	return status;
+}
+
+/* -----------------------------------------------------------------------------
+ * IOMMU Operations
+ */
+
+static struct iommu_domain *__ipmmu_domain_alloc(unsigned type)
+{
+	struct ipmmu_vmsa_domain *domain;
+
+	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
+	if (!domain)
+		return NULL;
+
+	mutex_init(&domain->mutex);
+
+	return &domain->io_domain;
+}
+
+static struct iommu_domain *ipmmu_domain_alloc(unsigned type)
+{
+	struct iommu_domain *io_domain = NULL;
+
+	switch (type) {
+	case IOMMU_DOMAIN_UNMANAGED:
+		io_domain = __ipmmu_domain_alloc(type);
+		break;
+
+	case IOMMU_DOMAIN_DMA:
+		io_domain = __ipmmu_domain_alloc(type);
+		if (io_domain && iommu_get_dma_cookie(io_domain)) {
+			kfree(io_domain);
+			io_domain = NULL;
+		}
+		break;
+	}
+
+	return io_domain;
+}
+
+static void ipmmu_domain_free(struct iommu_domain *io_domain)
+{
+	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
+
+	/*
+	 * Free the domain resources. We assume that all devices have already
+	 * been detached.
+	 */
+	iommu_put_dma_cookie(io_domain);
+	ipmmu_domain_destroy_context(domain);
+	free_io_pgtable_ops(domain->iop);
+	kfree(domain);
+}
+
+static int ipmmu_attach_device(struct iommu_domain *io_domain,
+			       struct device *dev)
+{
+	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+	struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
+	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
+	unsigned int i;
+	int ret = 0;
+
+	if (!mmu) {
+		dev_err(dev, "Cannot attach to IPMMU\n");
+		return -ENXIO;
+	}
+
+	mutex_lock(&domain->mutex);
+
+	if (!domain->mmu) {
+		/* The domain hasn't been used yet, initialize it. */
+		domain->mmu = mmu;
+		ret = ipmmu_domain_init_context(domain);
+		if (ret < 0) {
+			dev_err(dev, "Unable to initialize IPMMU context\n");
+			domain->mmu = NULL;
+		} else {
+			dev_info(dev, "Using IPMMU context %u\n",
+				 domain->context_id);
+		}
+	} else if (domain->mmu != mmu) {
+		/*
+		 * Something is wrong, we can't attach two devices using
+		 * different IOMMUs to the same domain.
+		 */
+		dev_err(dev, "Can't attach IPMMU %s to domain on IPMMU %s\n",
+			dev_name(mmu->dev), dev_name(domain->mmu->dev));
+		ret = -EINVAL;
+	} else
+		dev_info(dev, "Reusing IPMMU context %u\n", domain->context_id);
+
+	mutex_unlock(&domain->mutex);
+
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < fwspec->num_ids; ++i)
+		ipmmu_utlb_enable(domain, fwspec->ids[i]);
+
+	return 0;
+}
+
+static void ipmmu_detach_device(struct iommu_domain *io_domain,
+				struct device *dev)
+{
+	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
+	unsigned int i;
+
+	for (i = 0; i < fwspec->num_ids; ++i)
+		ipmmu_utlb_disable(domain, fwspec->ids[i]);
+
+	/*
+	 * TODO: Optimize by disabling the context when no device is attached.
+	 */
+}
+
+static int ipmmu_map(struct iommu_domain *io_domain, unsigned long iova,
+		     phys_addr_t paddr, size_t size, int prot)
+{
+	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
+
+	if (!domain)
+		return -ENODEV;
+
+	return domain->iop->map(domain->iop, iova, paddr, size, prot);
+}
+
+static size_t ipmmu_unmap(struct iommu_domain *io_domain, unsigned long iova,
+			  size_t size)
+{
+	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
+
+	return domain->iop->unmap(domain->iop, iova, size);
+}
+
+static void ipmmu_iotlb_sync(struct iommu_domain *io_domain)
+{
+	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
+
+	if (domain->mmu)
+		ipmmu_tlb_flush_all(domain);
+}
+
+static phys_addr_t ipmmu_iova_to_phys(struct iommu_domain *io_domain,
+				      dma_addr_t iova)
+{
+	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
+
+	/* TODO: Is locking needed ? */
+
+	return domain->iop->iova_to_phys(domain->iop, iova);
+}
+
+static int ipmmu_init_platform_device(struct device *dev,
+				      struct of_phandle_args *args)
+{
+	struct platform_device *ipmmu_pdev;
+
+	ipmmu_pdev = of_find_device_by_node(args->np);
+	if (!ipmmu_pdev)
+		return -ENODEV;
+
+	dev->iommu_fwspec->iommu_priv = platform_get_drvdata(ipmmu_pdev);
+	return 0;
+}
+
+static bool ipmmu_slave_whitelist(struct device *dev)
+{
+	/* By default, do not allow use of IPMMU */
+	return false;
+}
+
+static const struct soc_device_attribute soc_rcar_gen3[] = {
+	{ .soc_id = "r8a7795", },
+	{ .soc_id = "r8a7796", },
+	{ .soc_id = "r8a77965", },
+	{ .soc_id = "r8a77970", },
+	{ .soc_id = "r8a77995", },
+	{ /* sentinel */ }
+};
+
+static int ipmmu_of_xlate(struct device *dev,
+			  struct of_phandle_args *spec)
+{
+	/* For R-Car Gen3 use a white list to opt-in slave devices */
+	if (soc_device_match(soc_rcar_gen3) && !ipmmu_slave_whitelist(dev))
+		return -ENODEV;
+
+	iommu_fwspec_add_ids(dev, spec->args, 1);
+
+	/* Initialize once - xlate() will call multiple times */
+	if (to_ipmmu(dev))
+		return 0;
+
+	return ipmmu_init_platform_device(dev, spec);
+}
+
+static int ipmmu_init_arm_mapping(struct device *dev)
+{
+	struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
+	struct iommu_group *group;
+	int ret;
+
+	/* Create a device group and add the device to it. */
+	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);
+	iommu_group_put(group);
+
+	if (ret < 0) {
+		dev_err(dev, "Failed to add device to IPMMU group\n");
+		return ret;
+	}
+
+	/*
+	 * Create the ARM mapping, used by the ARM DMA mapping core to allocate
+	 * VAs. This will allocate a corresponding IOMMU domain.
+	 *
+	 * TODO:
+	 * - Create one mapping per context (TLB).
+	 * - Make the mapping size configurable ? We currently use a 2GB mapping
+	 *   at a 1GB offset to ensure that NULL VAs will fault.
+	 */
+	if (!mmu->mapping) {
+		struct dma_iommu_mapping *mapping;
+
+		mapping = arm_iommu_create_mapping(&platform_bus_type,
+						   SZ_1G, SZ_2G);
+		if (IS_ERR(mapping)) {
+			dev_err(mmu->dev, "failed to create ARM IOMMU mapping\n");
+			ret = PTR_ERR(mapping);
+			goto error;
+		}
+
+		mmu->mapping = mapping;
+	}
+
+	/* Attach the ARM VA mapping to the device. */
+	ret = arm_iommu_attach_device(dev, mmu->mapping);
+	if (ret < 0) {
+		dev_err(dev, "Failed to attach device to VA mapping\n");
+		goto error;
+	}
+
+	return 0;
+
+error:
+	iommu_group_remove_device(dev);
+	if (mmu->mapping)
+		arm_iommu_release_mapping(mmu->mapping);
+
+	return ret;
+}
+
+static int ipmmu_add_device(struct device *dev)
+{
+	struct iommu_group *group;
+
+	/*
+	 * Only let through devices that have been verified in xlate()
+	 */
+	if (!to_ipmmu(dev))
+		return -ENODEV;
+
+	if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_IOMMU_DMA))
+		return ipmmu_init_arm_mapping(dev);
+
+	group = iommu_group_get_for_dev(dev);
+	if (IS_ERR(group))
+		return PTR_ERR(group);
+
+	iommu_group_put(group);
+	return 0;
+}
+
+static void ipmmu_remove_device(struct device *dev)
+{
+	arm_iommu_detach_device(dev);
+	iommu_group_remove_device(dev);
+}
+
+static struct iommu_group *ipmmu_find_group(struct device *dev)
+{
+	struct ipmmu_vmsa_device *mmu = to_ipmmu(dev);
+	struct iommu_group *group;
+
+	if (mmu->group)
+		return iommu_group_ref_get(mmu->group);
+
+	group = iommu_group_alloc();
+	if (!IS_ERR(group))
+		mmu->group = group;
+
+	return group;
+}
+
+static const struct iommu_ops ipmmu_ops = {
+	.domain_alloc = ipmmu_domain_alloc,
+	.domain_free = ipmmu_domain_free,
+	.attach_dev = ipmmu_attach_device,
+	.detach_dev = ipmmu_detach_device,
+	.map = ipmmu_map,
+	.unmap = ipmmu_unmap,
+	.flush_iotlb_all = ipmmu_iotlb_sync,
+	.iotlb_sync = ipmmu_iotlb_sync,
+	.iova_to_phys = ipmmu_iova_to_phys,
+	.add_device = ipmmu_add_device,
+	.remove_device = ipmmu_remove_device,
+	.device_group = ipmmu_find_group,
+	.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
+	.of_xlate = ipmmu_of_xlate,
+};
+
+/* -----------------------------------------------------------------------------
+ * Probe/remove and init
+ */
+
+static void ipmmu_device_reset(struct ipmmu_vmsa_device *mmu)
+{
+	unsigned int i;
+
+	/* Disable all contexts. */
+	for (i = 0; i < mmu->num_ctx; ++i)
+		ipmmu_write(mmu, i * IM_CTX_SIZE + IMCTR, 0);
+}
+
+static const struct ipmmu_features ipmmu_features_default = {
+	.use_ns_alias_offset = true,
+	.has_cache_leaf_nodes = false,
+	.number_of_contexts = 1, /* software only tested with one context */
+	.setup_imbuscr = true,
+	.twobit_imttbcr_sl0 = false,
+	.reserved_context = false,
+};
+
+static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
+	.use_ns_alias_offset = false,
+	.has_cache_leaf_nodes = true,
+	.number_of_contexts = 8,
+	.setup_imbuscr = false,
+	.twobit_imttbcr_sl0 = true,
+	.reserved_context = true,
+};
+
+static const struct of_device_id ipmmu_of_ids[] = {
+	{
+		.compatible = "renesas,ipmmu-vmsa",
+		.data = &ipmmu_features_default,
+	}, {
+		.compatible = "renesas,ipmmu-r8a7795",
+		.data = &ipmmu_features_rcar_gen3,
+	}, {
+		.compatible = "renesas,ipmmu-r8a7796",
+		.data = &ipmmu_features_rcar_gen3,
+	}, {
+		.compatible = "renesas,ipmmu-r8a77965",
+		.data = &ipmmu_features_rcar_gen3,
+	}, {
+		.compatible = "renesas,ipmmu-r8a77970",
+		.data = &ipmmu_features_rcar_gen3,
+	}, {
+		.compatible = "renesas,ipmmu-r8a77995",
+		.data = &ipmmu_features_rcar_gen3,
+	}, {
+		/* Terminator */
+	},
+};
+
+MODULE_DEVICE_TABLE(of, ipmmu_of_ids);
+
+static int ipmmu_probe(struct platform_device *pdev)
+{
+	struct ipmmu_vmsa_device *mmu;
+	struct resource *res;
+	int irq;
+	int ret;
+
+	mmu = devm_kzalloc(&pdev->dev, sizeof(*mmu), GFP_KERNEL);
+	if (!mmu) {
+		dev_err(&pdev->dev, "cannot allocate device data\n");
+		return -ENOMEM;
+	}
+
+	mmu->dev = &pdev->dev;
+	mmu->num_utlbs = 48;
+	spin_lock_init(&mmu->lock);
+	bitmap_zero(mmu->ctx, IPMMU_CTX_MAX);
+	mmu->features = of_device_get_match_data(&pdev->dev);
+	dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40));
+
+	/* Map I/O memory and request IRQ. */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mmu->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mmu->base))
+		return PTR_ERR(mmu->base);
+
+	/*
+	 * The IPMMU has two register banks, for secure and non-secure modes.
+	 * The bank mapped at the beginning of the IPMMU address space
+	 * corresponds to the running mode of the CPU. When running in secure
+	 * mode the non-secure register bank is also available at an offset.
+	 *
+	 * Secure mode operation isn't clearly documented and is thus currently
+	 * not implemented in the driver. Furthermore, preliminary tests of
+	 * non-secure operation with the main register bank were not successful.
+	 * Offset the registers base unconditionally to point to the non-secure
+	 * alias space for now.
+	 */
+	if (mmu->features->use_ns_alias_offset)
+		mmu->base += IM_NS_ALIAS_OFFSET;
+
+	mmu->num_ctx = min_t(unsigned int, IPMMU_CTX_MAX,
+			     mmu->features->number_of_contexts);
+
+	irq = platform_get_irq(pdev, 0);
+
+	/*
+	 * Determine if this IPMMU instance is a root device by checking for
+	 * the lack of has_cache_leaf_nodes flag or renesas,ipmmu-main property.
+	 */
+	if (!mmu->features->has_cache_leaf_nodes ||
+	    !of_find_property(pdev->dev.of_node, "renesas,ipmmu-main", NULL))
+		mmu->root = mmu;
+	else
+		mmu->root = ipmmu_find_root();
+
+	/*
+	 * Wait until the root device has been registered for sure.
+	 */
+	if (!mmu->root)
+		return -EPROBE_DEFER;
+
+	/* Root devices have mandatory IRQs */
+	if (ipmmu_is_root(mmu)) {
+		if (irq < 0) {
+			dev_err(&pdev->dev, "no IRQ found\n");
+			return irq;
+		}
+
+		ret = devm_request_irq(&pdev->dev, irq, ipmmu_irq, 0,
+				       dev_name(&pdev->dev), mmu);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "failed to request IRQ %d\n", irq);
+			return ret;
+		}
+
+		ipmmu_device_reset(mmu);
+
+		if (mmu->features->reserved_context) {
+			dev_info(&pdev->dev, "IPMMU context 0 is reserved\n");
+			set_bit(0, mmu->ctx);
+		}
+	}
+
+	/*
+	 * Register the IPMMU to the IOMMU subsystem in the following cases:
+	 * - R-Car Gen2 IPMMU (all devices registered)
+	 * - R-Car Gen3 IPMMU (leaf devices only - skip root IPMMU-MM device)
+	 */
+	if (!mmu->features->has_cache_leaf_nodes || !ipmmu_is_root(mmu)) {
+		ret = iommu_device_sysfs_add(&mmu->iommu, &pdev->dev, NULL,
+					     dev_name(&pdev->dev));
+		if (ret)
+			return ret;
+
+		iommu_device_set_ops(&mmu->iommu, &ipmmu_ops);
+		iommu_device_set_fwnode(&mmu->iommu,
+					&pdev->dev.of_node->fwnode);
+
+		ret = iommu_device_register(&mmu->iommu);
+		if (ret)
+			return ret;
+
+#if defined(CONFIG_IOMMU_DMA)
+		if (!iommu_present(&platform_bus_type))
+			bus_set_iommu(&platform_bus_type, &ipmmu_ops);
+#endif
+	}
+
+	/*
+	 * We can't create the ARM mapping here as it requires the bus to have
+	 * an IOMMU, which only happens when bus_set_iommu() is called in
+	 * ipmmu_init() after the probe function returns.
+	 */
+
+	platform_set_drvdata(pdev, mmu);
+
+	return 0;
+}
+
+static int ipmmu_remove(struct platform_device *pdev)
+{
+	struct ipmmu_vmsa_device *mmu = platform_get_drvdata(pdev);
+
+	iommu_device_sysfs_remove(&mmu->iommu);
+	iommu_device_unregister(&mmu->iommu);
+
+	arm_iommu_release_mapping(mmu->mapping);
+
+	ipmmu_device_reset(mmu);
+
+	return 0;
+}
+
+static struct platform_driver ipmmu_driver = {
+	.driver = {
+		.name = "ipmmu-vmsa",
+		.of_match_table = of_match_ptr(ipmmu_of_ids),
+	},
+	.probe = ipmmu_probe,
+	.remove	= ipmmu_remove,
+};
+
+static int __init ipmmu_init(void)
+{
+	struct device_node *np;
+	static bool setup_done;
+	int ret;
+
+	if (setup_done)
+		return 0;
+
+	np = of_find_matching_node(NULL, ipmmu_of_ids);
+	if (!np)
+		return 0;
+
+	of_node_put(np);
+
+	ret = platform_driver_register(&ipmmu_driver);
+	if (ret < 0)
+		return ret;
+
+#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
+	if (!iommu_present(&platform_bus_type))
+		bus_set_iommu(&platform_bus_type, &ipmmu_ops);
+#endif
+
+	setup_done = true;
+	return 0;
+}
+
+static void __exit ipmmu_exit(void)
+{
+	return platform_driver_unregister(&ipmmu_driver);
+}
+
+subsys_initcall(ipmmu_init);
+module_exit(ipmmu_exit);
+
+MODULE_DESCRIPTION("IOMMU API for Renesas VMSA-compatible IPMMU");
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
+MODULE_LICENSE("GPL v2");