iommu/omap: Remove virtual memory manager

The OMAP3 ISP driver was the only user of the OMAP IOVMM API. Now that
is has been ported to the DMA API, remove the unused virtual memory
manager.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

6 files changed, 6 insertions, 931 deletions

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index d260605e6d5f..154e5a838257 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -143,16 +143,12 @@ config OMAP_IOMMU
 	depends on ARCH_OMAP2PLUS
 	select IOMMU_API
 
-config OMAP_IOVMM
-	tristate "OMAP IO Virtual Memory Manager Support"
-	depends on OMAP_IOMMU
-
 config OMAP_IOMMU_DEBUG
-       tristate "Export OMAP IOMMU/IOVMM internals in DebugFS"
-       depends on OMAP_IOVMM && DEBUG_FS
+       tristate "Export OMAP IOMMU internals in DebugFS"
+       depends on OMAP_IOMMU && DEBUG_FS
        help
          Select this to see extensive information about
-         the internal state of OMAP IOMMU/IOVMM in debugfs.
+         the internal state of OMAP IOMMU in debugfs.
 
          Say N unless you know you need this.
 
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 8893bad048e0..6a4a00ef088b 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -11,7 +11,6 @@ obj-$(CONFIG_IPMMU_VMSA) += ipmmu-vmsa.o
 obj-$(CONFIG_IRQ_REMAP) += intel_irq_remapping.o irq_remapping.o
 obj-$(CONFIG_OMAP_IOMMU) += omap-iommu.o
 obj-$(CONFIG_OMAP_IOMMU) += omap-iommu2.o
-obj-$(CONFIG_OMAP_IOVMM) += omap-iovmm.o
 obj-$(CONFIG_OMAP_IOMMU_DEBUG) += omap-iommu-debug.o
 obj-$(CONFIG_TEGRA_IOMMU_GART) += tegra-gart.o
 obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c
index 80fffba7f12d..531658d17333 100644
--- a/drivers/iommu/omap-iommu-debug.c
+++ b/drivers/iommu/omap-iommu-debug.c
@@ -213,116 +213,6 @@ static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
 	return bytes;
 }
 
-static ssize_t debug_read_mmap(struct file *file, char __user *userbuf,
-			       size_t count, loff_t *ppos)
-{
-	struct device *dev = file->private_data;
-	struct omap_iommu *obj = dev_to_omap_iommu(dev);
-	char *p, *buf;
-	struct iovm_struct *tmp;
-	int uninitialized_var(i);
-	ssize_t bytes;
-
-	buf = (char *)__get_free_page(GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-	p = buf;
-
-	p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n",
-		     "No", "start", "end", "size", "flags");
-	p += sprintf(p, "-------------------------------------------------\n");
-
-	mutex_lock(&iommu_debug_lock);
-
-	list_for_each_entry(tmp, &obj->mmap, list) {
-		size_t len;
-		const char *str = "%3d %08x-%08x %6x %8x\n";
-		const int maxcol = 39;
-
-		len = tmp->da_end - tmp->da_start;
-		p += snprintf(p, maxcol, str,
-			      i, tmp->da_start, tmp->da_end, len, tmp->flags);
-
-		if (PAGE_SIZE - (p - buf) < maxcol)
-			break;
-		i++;
-	}
-
-	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
-
-	mutex_unlock(&iommu_debug_lock);
-	free_page((unsigned long)buf);
-
-	return bytes;
-}
-
-static ssize_t debug_read_mem(struct file *file, char __user *userbuf,
-			      size_t count, loff_t *ppos)
-{
-	struct device *dev = file->private_data;
-	char *p, *buf;
-	struct iovm_struct *area;
-	ssize_t bytes;
-
-	count = min_t(ssize_t, count, PAGE_SIZE);
-
-	buf = (char *)__get_free_page(GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-	p = buf;
-
-	mutex_lock(&iommu_debug_lock);
-
-	area = omap_find_iovm_area(dev, (u32)ppos);
-	if (!area) {
-		bytes = -EINVAL;
-		goto err_out;
-	}
-	memcpy(p, area->va, count);
-	p += count;
-
-	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
-err_out:
-	mutex_unlock(&iommu_debug_lock);
-	free_page((unsigned long)buf);
-
-	return bytes;
-}
-
-static ssize_t debug_write_mem(struct file *file, const char __user *userbuf,
-			       size_t count, loff_t *ppos)
-{
-	struct device *dev = file->private_data;
-	struct iovm_struct *area;
-	char *p, *buf;
-
-	count = min_t(size_t, count, PAGE_SIZE);
-
-	buf = (char *)__get_free_page(GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-	p = buf;
-
-	mutex_lock(&iommu_debug_lock);
-
-	if (copy_from_user(p, userbuf, count)) {
-		count =  -EFAULT;
-		goto err_out;
-	}
-
-	area = omap_find_iovm_area(dev, (u32)ppos);
-	if (!area) {
-		count = -EINVAL;
-		goto err_out;
-	}
-	memcpy(area->va, p, count);
-err_out:
-	mutex_unlock(&iommu_debug_lock);
-	free_page((unsigned long)buf);
-
-	return count;
-}
-
 #define DEBUG_FOPS(name)						\
 	static const struct file_operations debug_##name##_fops = {	\
 		.open = simple_open,					\
@@ -342,8 +232,6 @@ DEBUG_FOPS_RO(ver);
 DEBUG_FOPS_RO(regs);
 DEBUG_FOPS_RO(tlb);
 DEBUG_FOPS(pagetable);
-DEBUG_FOPS_RO(mmap);
-DEBUG_FOPS(mem);
 
 #define __DEBUG_ADD_FILE(attr, mode)					\
 	{								\
@@ -389,8 +277,6 @@ static int iommu_debug_register(struct device *dev, void *data)
 	DEBUG_ADD_FILE_RO(regs);
 	DEBUG_ADD_FILE_RO(tlb);
 	DEBUG_ADD_FILE(pagetable);
-	DEBUG_ADD_FILE_RO(mmap);
-	DEBUG_ADD_FILE(mem);
 
 	return 0;
 
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 895af06a667f..61599e2b33ca 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -959,31 +959,18 @@ static int omap_iommu_probe(struct platform_device *pdev)
 			return err;
 		if (obj->nr_tlb_entries != 32 && obj->nr_tlb_entries != 8)
 			return -EINVAL;
-		/*
-		 * da_start and da_end are needed for omap-iovmm, so hardcode
-		 * these values as used by OMAP3 ISP - the only user for
-		 * omap-iovmm
-		 */
-		obj->da_start = 0;
-		obj->da_end = 0xfffff000;
 		if (of_find_property(of, "ti,iommu-bus-err-back", NULL))
 			obj->has_bus_err_back = MMU_GP_REG_BUS_ERR_BACK_EN;
 	} else {
 		obj->nr_tlb_entries = pdata->nr_tlb_entries;
 		obj->name = pdata->name;
-		obj->da_start = pdata->da_start;
-		obj->da_end = pdata->da_end;
 	}
-	if (obj->da_end <= obj->da_start)
-		return -EINVAL;
 
 	obj->dev = &pdev->dev;
 	obj->ctx = (void *)obj + sizeof(*obj);
 
 	spin_lock_init(&obj->iommu_lock);
-	mutex_init(&obj->mmap_lock);
 	spin_lock_init(&obj->page_table_lock);
-	INIT_LIST_HEAD(&obj->mmap);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	obj->regbase = devm_ioremap_resource(obj->dev, res);
diff --git a/drivers/iommu/omap-iommu.h b/drivers/iommu/omap-iommu.h
index ea920c3e94ff..1275a822934b 100644
--- a/drivers/iommu/omap-iommu.h
+++ b/drivers/iommu/omap-iommu.h
@@ -46,12 +46,7 @@ struct omap_iommu {
 
 	int		nr_tlb_entries;
 
-	struct list_head	mmap;
-	struct mutex		mmap_lock; /* protect mmap */
-
 	void *ctx; /* iommu context: registres saved area */
-	u32 da_start;
-	u32 da_end;
 
 	int has_bus_err_back;
 };
@@ -154,9 +149,12 @@ static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
 #define MMU_RAM_PADDR_MASK \
 	((~0UL >> MMU_RAM_PADDR_SHIFT) << MMU_RAM_PADDR_SHIFT)
 
+#define MMU_RAM_ENDIAN_SHIFT	9
 #define MMU_RAM_ENDIAN_MASK	(1 << MMU_RAM_ENDIAN_SHIFT)
+#define MMU_RAM_ENDIAN_LITTLE	(0 << MMU_RAM_ENDIAN_SHIFT)
 #define MMU_RAM_ENDIAN_BIG	(1 << MMU_RAM_ENDIAN_SHIFT)
 
+#define MMU_RAM_ELSZ_SHIFT	7
 #define MMU_RAM_ELSZ_MASK	(3 << MMU_RAM_ELSZ_SHIFT)
 #define MMU_RAM_ELSZ_8		(0 << MMU_RAM_ELSZ_SHIFT)
 #define MMU_RAM_ELSZ_16		(1 << MMU_RAM_ELSZ_SHIFT)
diff --git a/drivers/iommu/omap-iovmm.c b/drivers/iommu/omap-iovmm.c
deleted file mode 100644
index f583ba049168..000000000000
--- a/drivers/iommu/omap-iovmm.c
+++ /dev/null
@@ -1,791 +0,0 @@
-/*
- * omap iommu: simple virtual address space management
- *
- * Copyright (C) 2008-2009 Nokia Corporation
- *
- * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.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.
- */
-
-#include <linux/module.h>
-#include <linux/err.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-#include <linux/device.h>
-#include <linux/scatterlist.h>
-#include <linux/iommu.h>
-#include <linux/omap-iommu.h>
-#include <linux/platform_data/iommu-omap.h>
-
-#include <asm/cacheflush.h>
-#include <asm/mach/map.h>
-
-#include "omap-iopgtable.h"
-#include "omap-iommu.h"
-
-/*
- * IOVMF_FLAGS: attribute for iommu virtual memory area(iovma)
- *
- * lower 16 bit is used for h/w and upper 16 bit is for s/w.
- */
-#define IOVMF_SW_SHIFT		16
-
-/*
- * iovma: h/w flags derived from cam and ram attribute
- */
-#define IOVMF_CAM_MASK		(~((1 << 10) - 1))
-#define IOVMF_RAM_MASK		(~IOVMF_CAM_MASK)
-
-#define IOVMF_PGSZ_MASK		(3 << 0)
-#define IOVMF_PGSZ_1M		MMU_CAM_PGSZ_1M
-#define IOVMF_PGSZ_64K		MMU_CAM_PGSZ_64K
-#define IOVMF_PGSZ_4K		MMU_CAM_PGSZ_4K
-#define IOVMF_PGSZ_16M		MMU_CAM_PGSZ_16M
-
-#define IOVMF_ENDIAN_MASK	(1 << 9)
-#define IOVMF_ENDIAN_BIG	MMU_RAM_ENDIAN_BIG
-
-#define IOVMF_ELSZ_MASK		(3 << 7)
-#define IOVMF_ELSZ_16		MMU_RAM_ELSZ_16
-#define IOVMF_ELSZ_32		MMU_RAM_ELSZ_32
-#define IOVMF_ELSZ_NONE		MMU_RAM_ELSZ_NONE
-
-#define IOVMF_MIXED_MASK	(1 << 6)
-#define IOVMF_MIXED		MMU_RAM_MIXED
-
-/*
- * iovma: s/w flags, used for mapping and umapping internally.
- */
-#define IOVMF_MMIO		(1 << IOVMF_SW_SHIFT)
-#define IOVMF_ALLOC		(2 << IOVMF_SW_SHIFT)
-#define IOVMF_ALLOC_MASK	(3 << IOVMF_SW_SHIFT)
-
-/* "superpages" is supported just with physically linear pages */
-#define IOVMF_DISCONT		(1 << (2 + IOVMF_SW_SHIFT))
-#define IOVMF_LINEAR		(2 << (2 + IOVMF_SW_SHIFT))
-#define IOVMF_LINEAR_MASK	(3 << (2 + IOVMF_SW_SHIFT))
-
-#define IOVMF_DA_FIXED		(1 << (4 + IOVMF_SW_SHIFT))
-
-static struct kmem_cache *iovm_area_cachep;
-
-/* return the offset of the first scatterlist entry in a sg table */
-static unsigned int sgtable_offset(const struct sg_table *sgt)
-{
-	if (!sgt || !sgt->nents)
-		return 0;
-
-	return sgt->sgl->offset;
-}
-
-/* return total bytes of sg buffers */
-static size_t sgtable_len(const struct sg_table *sgt)
-{
-	unsigned int i, total = 0;
-	struct scatterlist *sg;
-
-	if (!sgt)
-		return 0;
-
-	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
-		size_t bytes;
-
-		bytes = sg->length + sg->offset;
-
-		if (!iopgsz_ok(bytes)) {
-			pr_err("%s: sg[%d] not iommu pagesize(%u %u)\n",
-			       __func__, i, bytes, sg->offset);
-			return 0;
-		}
-
-		if (i && sg->offset) {
-			pr_err("%s: sg[%d] offset not allowed in internal entries\n",
-				__func__, i);
-			return 0;
-		}
-
-		total += bytes;
-	}
-
-	return total;
-}
-#define sgtable_ok(x)	(!!sgtable_len(x))
-
-static unsigned max_alignment(u32 addr)
-{
-	int i;
-	unsigned pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, };
-	for (i = 0; i < ARRAY_SIZE(pagesize) && addr & (pagesize[i] - 1); i++)
-		;
-	return (i < ARRAY_SIZE(pagesize)) ? pagesize[i] : 0;
-}
-
-/*
- * calculate the optimal number sg elements from total bytes based on
- * iommu superpages
- */
-static unsigned sgtable_nents(size_t bytes, u32 da, u32 pa)
-{
-	unsigned nr_entries = 0, ent_sz;
-
-	if (!PAGE_ALIGNED(bytes)) {
-		pr_err("%s: wrong size %08x\n", __func__, bytes);
-		return 0;
-	}
-
-	while (bytes) {
-		ent_sz = max_alignment(da | pa);
-		ent_sz = min_t(unsigned, ent_sz, iopgsz_max(bytes));
-		nr_entries++;
-		da += ent_sz;
-		pa += ent_sz;
-		bytes -= ent_sz;
-	}
-
-	return nr_entries;
-}
-
-/* allocate and initialize sg_table header(a kind of 'superblock') */
-static struct sg_table *sgtable_alloc(const size_t bytes, u32 flags,
-							u32 da, u32 pa)
-{
-	unsigned int nr_entries;
-	int err;
-	struct sg_table *sgt;
-
-	if (!bytes)
-		return ERR_PTR(-EINVAL);
-
-	if (!PAGE_ALIGNED(bytes))
-		return ERR_PTR(-EINVAL);
-
-	if (flags & IOVMF_LINEAR) {
-		nr_entries = sgtable_nents(bytes, da, pa);
-		if (!nr_entries)
-			return ERR_PTR(-EINVAL);
-	} else
-		nr_entries =  bytes / PAGE_SIZE;
-
-	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
-	if (!sgt)
-		return ERR_PTR(-ENOMEM);
-
-	err = sg_alloc_table(sgt, nr_entries, GFP_KERNEL);
-	if (err) {
-		kfree(sgt);
-		return ERR_PTR(err);
-	}
-
-	pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries);
-
-	return sgt;
-}
-
-/* free sg_table header(a kind of superblock) */
-static void sgtable_free(struct sg_table *sgt)
-{
-	if (!sgt)
-		return;
-
-	sg_free_table(sgt);
-	kfree(sgt);
-
-	pr_debug("%s: sgt:%p\n", __func__, sgt);
-}
-
-/* map 'sglist' to a contiguous mpu virtual area and return 'va' */
-static void *vmap_sg(const struct sg_table *sgt)
-{
-	u32 va;
-	size_t total;
-	unsigned int i;
-	struct scatterlist *sg;
-	struct vm_struct *new;
-	const struct mem_type *mtype;
-
-	mtype = get_mem_type(MT_DEVICE);
-	if (!mtype)
-		return ERR_PTR(-EINVAL);
-
-	total = sgtable_len(sgt);
-	if (!total)
-		return ERR_PTR(-EINVAL);
-
-	new = __get_vm_area(total, VM_IOREMAP, VMALLOC_START, VMALLOC_END);
-	if (!new)
-		return ERR_PTR(-ENOMEM);
-	va = (u32)new->addr;
-
-	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
-		size_t bytes;
-		u32 pa;
-		int err;
-
-		pa = sg_phys(sg) - sg->offset;
-		bytes = sg->length + sg->offset;
-
-		BUG_ON(bytes != PAGE_SIZE);
-
-		err = ioremap_page(va,  pa, mtype);
-		if (err)
-			goto err_out;
-
-		va += bytes;
-	}
-
-	flush_cache_vmap((unsigned long)new->addr,
-				(unsigned long)(new->addr + total));
-	return new->addr;
-
-err_out:
-	WARN_ON(1); /* FIXME: cleanup some mpu mappings */
-	vunmap(new->addr);
-	return ERR_PTR(-EAGAIN);
-}
-
-static inline void vunmap_sg(const void *va)
-{
-	vunmap(va);
-}
-
-static struct iovm_struct *__find_iovm_area(struct omap_iommu *obj,
-							const u32 da)
-{
-	struct iovm_struct *tmp;
-
-	list_for_each_entry(tmp, &obj->mmap, list) {
-		if ((da >= tmp->da_start) && (da < tmp->da_end)) {
-			size_t len;
-
-			len = tmp->da_end - tmp->da_start;
-
-			dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n",
-				__func__, tmp->da_start, da, tmp->da_end, len,
-				tmp->flags);
-
-			return tmp;
-		}
-	}
-
-	return NULL;
-}
-
-/**
- * omap_find_iovm_area  -  find iovma which includes @da
- * @dev:	client device
- * @da:		iommu device virtual address
- *
- * Find the existing iovma starting at @da
- */
-struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da)
-{
-	struct omap_iommu *obj = dev_to_omap_iommu(dev);
-	struct iovm_struct *area;
-
-	mutex_lock(&obj->mmap_lock);
-	area = __find_iovm_area(obj, da);
-	mutex_unlock(&obj->mmap_lock);
-
-	return area;
-}
-EXPORT_SYMBOL_GPL(omap_find_iovm_area);
-
-/*
- * This finds the hole(area) which fits the requested address and len
- * in iovmas mmap, and returns the new allocated iovma.
- */
-static struct iovm_struct *alloc_iovm_area(struct omap_iommu *obj, u32 da,
-					   size_t bytes, u32 flags)
-{
-	struct iovm_struct *new, *tmp;
-	u32 start, prev_end, alignment;
-
-	if (!obj || !bytes)
-		return ERR_PTR(-EINVAL);
-
-	start = da;
-	alignment = PAGE_SIZE;
-
-	if (~flags & IOVMF_DA_FIXED) {
-		/* Don't map address 0 */
-		start = obj->da_start ? obj->da_start : alignment;
-
-		if (flags & IOVMF_LINEAR)
-			alignment = iopgsz_max(bytes);
-		start = roundup(start, alignment);
-	} else if (start < obj->da_start || start > obj->da_end ||
-					obj->da_end - start < bytes) {
-		return ERR_PTR(-EINVAL);
-	}
-
-	tmp = NULL;
-	if (list_empty(&obj->mmap))
-		goto found;
-
-	prev_end = 0;
-	list_for_each_entry(tmp, &obj->mmap, list) {
-
-		if (prev_end > start)
-			break;
-
-		if (tmp->da_start > start && (tmp->da_start - start) >= bytes)
-			goto found;
-
-		if (tmp->da_end >= start && ~flags & IOVMF_DA_FIXED)
-			start = roundup(tmp->da_end + 1, alignment);
-
-		prev_end = tmp->da_end;
-	}
-
-	if ((start >= prev_end) && (obj->da_end - start >= bytes))
-		goto found;
-
-	dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n",
-		__func__, da, bytes, flags);
-
-	return ERR_PTR(-EINVAL);
-
-found:
-	new = kmem_cache_zalloc(iovm_area_cachep, GFP_KERNEL);
-	if (!new)
-		return ERR_PTR(-ENOMEM);
-
-	new->iommu = obj;
-	new->da_start = start;
-	new->da_end = start + bytes;
-	new->flags = flags;
-
-	/*
-	 * keep ascending order of iovmas
-	 */
-	if (tmp)
-		list_add_tail(&new->list, &tmp->list);
-	else
-		list_add(&new->list, &obj->mmap);
-
-	dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n",
-		__func__, new->da_start, start, new->da_end, bytes, flags);
-
-	return new;
-}
-
-static void free_iovm_area(struct omap_iommu *obj, struct iovm_struct *area)
-{
-	size_t bytes;
-
-	BUG_ON(!obj || !area);
-
-	bytes = area->da_end - area->da_start;
-
-	dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n",
-		__func__, area->da_start, area->da_end, bytes, area->flags);
-
-	list_del(&area->list);
-	kmem_cache_free(iovm_area_cachep, area);
-}
-
-/**
- * omap_da_to_va - convert (d) to (v)
- * @dev:	client device
- * @da:		iommu device virtual address
- * @va:		mpu virtual address
- *
- * Returns mpu virtual addr which corresponds to a given device virtual addr
- */
-void *omap_da_to_va(struct device *dev, u32 da)
-{
-	struct omap_iommu *obj = dev_to_omap_iommu(dev);
-	void *va = NULL;
-	struct iovm_struct *area;
-
-	mutex_lock(&obj->mmap_lock);
-
-	area = __find_iovm_area(obj, da);
-	if (!area) {
-		dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da);
-		goto out;
-	}
-	va = area->va;
-out:
-	mutex_unlock(&obj->mmap_lock);
-
-	return va;
-}
-EXPORT_SYMBOL_GPL(omap_da_to_va);
-
-static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va)
-{
-	unsigned int i;
-	struct scatterlist *sg;
-	void *va = _va;
-	void *va_end;
-
-	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
-		struct page *pg;
-		const size_t bytes = PAGE_SIZE;
-
-		/*
-		 * iommu 'superpage' isn't supported with 'omap_iommu_vmalloc()'
-		 */
-		pg = vmalloc_to_page(va);
-		BUG_ON(!pg);
-		sg_set_page(sg, pg, bytes, 0);
-
-		va += bytes;
-	}
-
-	va_end = _va + PAGE_SIZE * i;
-}
-
-static inline void sgtable_drain_vmalloc(struct sg_table *sgt)
-{
-	/*
-	 * Actually this is not necessary at all, just exists for
-	 * consistency of the code readability.
-	 */
-	BUG_ON(!sgt);
-}
-
-/* create 'da' <-> 'pa' mapping from 'sgt' */
-static int map_iovm_area(struct iommu_domain *domain, struct iovm_struct *new,
-			const struct sg_table *sgt, u32 flags)
-{
-	int err;
-	unsigned int i, j;
-	struct scatterlist *sg;
-	u32 da = new->da_start;
-
-	if (!domain || !sgt)
-		return -EINVAL;
-
-	BUG_ON(!sgtable_ok(sgt));
-
-	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
-		u32 pa;
-		size_t bytes;
-
-		pa = sg_phys(sg) - sg->offset;
-		bytes = sg->length + sg->offset;
-
-		flags &= ~IOVMF_PGSZ_MASK;
-
-		if (bytes_to_iopgsz(bytes) < 0)
-			goto err_out;
-
-		pr_debug("%s: [%d] %08x %08x(%x)\n", __func__,
-			 i, da, pa, bytes);
-
-		err = iommu_map(domain, da, pa, bytes, flags);
-		if (err)
-			goto err_out;
-
-		da += bytes;
-	}
-	return 0;
-
-err_out:
-	da = new->da_start;
-
-	for_each_sg(sgt->sgl, sg, i, j) {
-		size_t bytes;
-
-		bytes = sg->length + sg->offset;
-
-		/* ignore failures.. we're already handling one */
-		iommu_unmap(domain, da, bytes);
-
-		da += bytes;
-	}
-	return err;
-}
-
-/* release 'da' <-> 'pa' mapping */
-static void unmap_iovm_area(struct iommu_domain *domain, struct omap_iommu *obj,
-						struct iovm_struct *area)
-{
-	u32 start;
-	size_t total = area->da_end - area->da_start;
-	const struct sg_table *sgt = area->sgt;
-	struct scatterlist *sg;
-	int i;
-	size_t unmapped;
-
-	BUG_ON(!sgtable_ok(sgt));
-	BUG_ON((!total) || !PAGE_ALIGNED(total));
-
-	start = area->da_start;
-	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
-		size_t bytes;
-
-		bytes = sg->length + sg->offset;
-
-		unmapped = iommu_unmap(domain, start, bytes);
-		if (unmapped < bytes)
-			break;
-
-		dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n",
-				__func__, start, bytes, area->flags);
-
-		BUG_ON(!PAGE_ALIGNED(bytes));
-
-		total -= bytes;
-		start += bytes;
-	}
-	BUG_ON(total);
-}
-
-/* template function for all unmapping */
-static struct sg_table *unmap_vm_area(struct iommu_domain *domain,
-				      struct omap_iommu *obj, const u32 da,
-				      void (*fn)(const void *), u32 flags)
-{
-	struct sg_table *sgt = NULL;
-	struct iovm_struct *area;
-
-	if (!PAGE_ALIGNED(da)) {
-		dev_err(obj->dev, "%s: alignment err(%08x)\n", __func__, da);
-		return NULL;
-	}
-
-	mutex_lock(&obj->mmap_lock);
-
-	area = __find_iovm_area(obj, da);
-	if (!area) {
-		dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da);
-		goto out;
-	}
-
-	if ((area->flags & flags) != flags) {
-		dev_err(obj->dev, "%s: wrong flags(%08x)\n", __func__,
-			area->flags);
-		goto out;
-	}
-	sgt = (struct sg_table *)area->sgt;
-
-	unmap_iovm_area(domain, obj, area);
-
-	fn(area->va);
-
-	dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", __func__,
-		area->da_start, da, area->da_end,
-		area->da_end - area->da_start, area->flags);
-
-	free_iovm_area(obj, area);
-out:
-	mutex_unlock(&obj->mmap_lock);
-
-	return sgt;
-}
-
-static u32 map_iommu_region(struct iommu_domain *domain, struct omap_iommu *obj,
-				u32 da, const struct sg_table *sgt, void *va,
-				size_t bytes, u32 flags)
-{
-	int err = -ENOMEM;
-	struct iovm_struct *new;
-
-	mutex_lock(&obj->mmap_lock);
-
-	new = alloc_iovm_area(obj, da, bytes, flags);
-	if (IS_ERR(new)) {
-		err = PTR_ERR(new);
-		goto err_alloc_iovma;
-	}
-	new->va = va;
-	new->sgt = sgt;
-
-	if (map_iovm_area(domain, new, sgt, new->flags))
-		goto err_map;
-
-	mutex_unlock(&obj->mmap_lock);
-
-	dev_dbg(obj->dev, "%s: da:%08x(%x) flags:%08x va:%p\n",
-		__func__, new->da_start, bytes, new->flags, va);
-
-	return new->da_start;
-
-err_map:
-	free_iovm_area(obj, new);
-err_alloc_iovma:
-	mutex_unlock(&obj->mmap_lock);
-	return err;
-}
-
-static inline u32
-__iommu_vmap(struct iommu_domain *domain, struct omap_iommu *obj,
-				u32 da, const struct sg_table *sgt,
-				void *va, size_t bytes, u32 flags)
-{
-	return map_iommu_region(domain, obj, da, sgt, va, bytes, flags);
-}
-
-/**
- * omap_iommu_vmap  -  (d)-(p)-(v) address mapper
- * @domain:	iommu domain
- * @dev:	client device
- * @sgt:	address of scatter gather table
- * @flags:	iovma and page property
- *
- * Creates 1-n-1 mapping with given @sgt and returns @da.
- * All @sgt element must be io page size aligned.
- */
-u32 omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
-		const struct sg_table *sgt, u32 flags)
-{
-	struct omap_iommu *obj = dev_to_omap_iommu(dev);
-	size_t bytes;
-	void *va = NULL;
-
-	if (!obj || !obj->dev || !sgt)
-		return -EINVAL;
-
-	bytes = sgtable_len(sgt);
-	if (!bytes)
-		return -EINVAL;
-	bytes = PAGE_ALIGN(bytes);
-
-	if (flags & IOVMF_MMIO) {
-		va = vmap_sg(sgt);
-		if (IS_ERR(va))
-			return PTR_ERR(va);
-	}
-
-	flags |= IOVMF_DISCONT;
-	flags |= IOVMF_MMIO;
-
-	da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags);
-	if (IS_ERR_VALUE(da))
-		vunmap_sg(va);
-
-	return da + sgtable_offset(sgt);
-}
-EXPORT_SYMBOL_GPL(omap_iommu_vmap);
-
-/**
- * omap_iommu_vunmap  -  release virtual mapping obtained by 'omap_iommu_vmap()'
- * @domain:	iommu domain
- * @dev:	client device
- * @da:		iommu device virtual address
- *
- * Free the iommu virtually contiguous memory area starting at
- * @da, which was returned by 'omap_iommu_vmap()'.
- */
-struct sg_table *
-omap_iommu_vunmap(struct iommu_domain *domain, struct device *dev, u32 da)
-{
-	struct omap_iommu *obj = dev_to_omap_iommu(dev);
-	struct sg_table *sgt;
-	/*
-	 * 'sgt' is allocated before 'omap_iommu_vmalloc()' is called.
-	 * Just returns 'sgt' to the caller to free
-	 */
-	da &= PAGE_MASK;
-	sgt = unmap_vm_area(domain, obj, da, vunmap_sg,
-					IOVMF_DISCONT | IOVMF_MMIO);
-	if (!sgt)
-		dev_dbg(obj->dev, "%s: No sgt\n", __func__);
-	return sgt;
-}
-EXPORT_SYMBOL_GPL(omap_iommu_vunmap);
-
-/**
- * omap_iommu_vmalloc  -  (d)-(p)-(v) address allocator and mapper
- * @dev:	client device
- * @da:		contiguous iommu virtual memory
- * @bytes:	allocation size
- * @flags:	iovma and page property
- *
- * Allocate @bytes linearly and creates 1-n-1 mapping and returns
- * @da again, which might be adjusted if 'IOVMF_DA_FIXED' is not set.
- */
-u32
-omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev, u32 da,
-						size_t bytes, u32 flags)
-{
-	struct omap_iommu *obj = dev_to_omap_iommu(dev);
-	void *va;
-	struct sg_table *sgt;
-
-	if (!obj || !obj->dev || !bytes)
-		return -EINVAL;
-
-	bytes = PAGE_ALIGN(bytes);
-
-	va = vmalloc(bytes);
-	if (!va)
-		return -ENOMEM;
-
-	flags |= IOVMF_DISCONT;
-	flags |= IOVMF_ALLOC;
-
-	sgt = sgtable_alloc(bytes, flags, da, 0);
-	if (IS_ERR(sgt)) {
-		da = PTR_ERR(sgt);
-		goto err_sgt_alloc;
-	}
-	sgtable_fill_vmalloc(sgt, va);
-
-	da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags);
-	if (IS_ERR_VALUE(da))
-		goto err_iommu_vmap;
-
-	return da;
-
-err_iommu_vmap:
-	sgtable_drain_vmalloc(sgt);
-	sgtable_free(sgt);
-err_sgt_alloc:
-	vfree(va);
-	return da;
-}
-EXPORT_SYMBOL_GPL(omap_iommu_vmalloc);
-
-/**
- * omap_iommu_vfree  -  release memory allocated by 'omap_iommu_vmalloc()'
- * @dev:	client device
- * @da:		iommu device virtual address
- *
- * Frees the iommu virtually continuous memory area starting at
- * @da, as obtained from 'omap_iommu_vmalloc()'.
- */
-void omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
-								const u32 da)
-{
-	struct omap_iommu *obj = dev_to_omap_iommu(dev);
-	struct sg_table *sgt;
-
-	sgt = unmap_vm_area(domain, obj, da, vfree,
-						IOVMF_DISCONT | IOVMF_ALLOC);
-	if (!sgt)
-		dev_dbg(obj->dev, "%s: No sgt\n", __func__);
-	sgtable_free(sgt);
-}
-EXPORT_SYMBOL_GPL(omap_iommu_vfree);
-
-static int __init iovmm_init(void)
-{
-	const unsigned long flags = SLAB_HWCACHE_ALIGN;
-	struct kmem_cache *p;
-
-	p = kmem_cache_create("iovm_area_cache", sizeof(struct iovm_struct), 0,
-			      flags, NULL);
-	if (!p)
-		return -ENOMEM;
-	iovm_area_cachep = p;
-
-	return 0;
-}
-module_init(iovmm_init);
-
-static void __exit iovmm_exit(void)
-{
-	kmem_cache_destroy(iovm_area_cachep);
-}
-module_exit(iovmm_exit);
-
-MODULE_DESCRIPTION("omap iommu: simple virtual address space management");
-MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
-MODULE_LICENSE("GPL v2");