Merge branch 'disintegrate-asm-generic' of git://git.infradead.org/users/dhowells/linux-headers into asm-generic

Patches from David Howells <dhowells@redhat.com>:

This is to complete part of the UAPI disintegration for which the
preparatory patches were pulled recently.

Note that there are some fixup patches which are at the base of the
branch aimed at you, plus all arches get the asm-generic branch merged in too.

* 'disintegrate-asm-generic' of git://git.infradead.org/users/dhowells/linux-headers:
  UAPI: (Scripted) Disintegrate include/asm-generic
  UAPI: Fix conditional header installation handling (notably kvm_para.h on m68k)
  c6x: remove c6x signal.h
  UAPI: Split compound conditionals containing __KERNEL__ in Arm64
  UAPI: Fix the guards on various asm/unistd.h files

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

5 files changed, 327 insertions, 101 deletions

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 2a8e380501e..577baf7d0a8 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -554,7 +554,7 @@ static const struct of_device_id l2x0_ids[] __initconst = {
 int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
 {
 	struct device_node *np;
-	struct l2x0_of_data *data;
+	const struct l2x0_of_data *data;
 	struct resource res;
 
 	np = of_find_matching_node(NULL, l2x0_ids);
diff --git a/arch/arm/mm/cache-tauros2.c b/arch/arm/mm/cache-tauros2.c
index 23a7643e9a8..1be0f4e5e6e 100644
--- a/arch/arm/mm/cache-tauros2.c
+++ b/arch/arm/mm/cache-tauros2.c
@@ -15,8 +15,11 @@
  */
 
 #include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
 #include <asm/cacheflush.h>
 #include <asm/cp15.h>
+#include <asm/cputype.h>
 #include <asm/hardware/cache-tauros2.h>
 
 
@@ -144,25 +147,8 @@ static inline void __init write_extra_features(u32 u)
 	__asm__("mcr p15, 1, %0, c15, c1, 0" : : "r" (u));
 }
 
-static void __init disable_l2_prefetch(void)
-{
-	u32 u;
-
-	/*
-	 * Read the CPU Extra Features register and verify that the
-	 * Disable L2 Prefetch bit is set.
-	 */
-	u = read_extra_features();
-	if (!(u & 0x01000000)) {
-		printk(KERN_INFO "Tauros2: Disabling L2 prefetch.\n");
-		write_extra_features(u | 0x01000000);
-	}
-}
-
 static inline int __init cpuid_scheme(void)
 {
-	extern int processor_id;
-
 	return !!((processor_id & 0x000f0000) == 0x000f0000);
 }
 
@@ -189,12 +175,36 @@ static inline void __init write_actlr(u32 actlr)
 	__asm__("mcr p15, 0, %0, c1, c0, 1\n" : : "r" (actlr));
 }
 
-void __init tauros2_init(void)
+static void enable_extra_feature(unsigned int features)
+{
+	u32 u;
+
+	u = read_extra_features();
+
+	if (features & CACHE_TAUROS2_PREFETCH_ON)
+		u &= ~0x01000000;
+	else
+		u |= 0x01000000;
+	printk(KERN_INFO "Tauros2: %s L2 prefetch.\n",
+			(features & CACHE_TAUROS2_PREFETCH_ON)
+			? "Enabling" : "Disabling");
+
+	if (features & CACHE_TAUROS2_LINEFILL_BURST8)
+		u |= 0x00100000;
+	else
+		u &= ~0x00100000;
+	printk(KERN_INFO "Tauros2: %s line fill burt8.\n",
+			(features & CACHE_TAUROS2_LINEFILL_BURST8)
+			? "Enabling" : "Disabling");
+
+	write_extra_features(u);
+}
+
+static void __init tauros2_internal_init(unsigned int features)
 {
-	extern int processor_id;
-	char *mode;
+	char *mode = NULL;
 
-	disable_l2_prefetch();
+	enable_extra_feature(features);
 
 #ifdef CONFIG_CPU_32v5
 	if ((processor_id & 0xff0f0000) == 0x56050000) {
@@ -286,3 +296,34 @@ void __init tauros2_init(void)
 	printk(KERN_INFO "Tauros2: L2 cache support initialised "
 			 "in %s mode.\n", mode);
 }
+
+#ifdef CONFIG_OF
+static const struct of_device_id tauros2_ids[] __initconst = {
+	{ .compatible = "marvell,tauros2-cache"},
+	{}
+};
+#endif
+
+void __init tauros2_init(unsigned int features)
+{
+#ifdef CONFIG_OF
+	struct device_node *node;
+	int ret;
+	unsigned int f;
+
+	node = of_find_matching_node(NULL, tauros2_ids);
+	if (!node) {
+		pr_info("Not found marvell,tauros2-cache, disable it\n");
+		return;
+	}
+
+	ret = of_property_read_u32(node, "marvell,tauros2-cache-features", &f);
+	if (ret) {
+		pr_info("Not found marvell,tauros-cache-features property, "
+			"disable extra features\n");
+		features = 0;
+	} else
+		features = f;
+#endif
+	tauros2_internal_init(features);
+}
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 13f555d6249..477a2d23ddf 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -73,11 +73,18 @@ static dma_addr_t arm_dma_map_page(struct device *dev, struct page *page,
 	     unsigned long offset, size_t size, enum dma_data_direction dir,
 	     struct dma_attrs *attrs)
 {
-	if (!arch_is_coherent() && !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
+	if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
 		__dma_page_cpu_to_dev(page, offset, size, dir);
 	return pfn_to_dma(dev, page_to_pfn(page)) + offset;
 }
 
+static dma_addr_t arm_coherent_dma_map_page(struct device *dev, struct page *page,
+	     unsigned long offset, size_t size, enum dma_data_direction dir,
+	     struct dma_attrs *attrs)
+{
+	return pfn_to_dma(dev, page_to_pfn(page)) + offset;
+}
+
 /**
  * arm_dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
@@ -96,7 +103,7 @@ static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle,
 		size_t size, enum dma_data_direction dir,
 		struct dma_attrs *attrs)
 {
-	if (!arch_is_coherent() && !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
+	if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
 		__dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)),
 				      handle & ~PAGE_MASK, size, dir);
 }
@@ -106,8 +113,7 @@ static void arm_dma_sync_single_for_cpu(struct device *dev,
 {
 	unsigned int offset = handle & (PAGE_SIZE - 1);
 	struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset));
-	if (!arch_is_coherent())
-		__dma_page_dev_to_cpu(page, offset, size, dir);
+	__dma_page_dev_to_cpu(page, offset, size, dir);
 }
 
 static void arm_dma_sync_single_for_device(struct device *dev,
@@ -115,8 +121,7 @@ static void arm_dma_sync_single_for_device(struct device *dev,
 {
 	unsigned int offset = handle & (PAGE_SIZE - 1);
 	struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset));
-	if (!arch_is_coherent())
-		__dma_page_cpu_to_dev(page, offset, size, dir);
+	__dma_page_cpu_to_dev(page, offset, size, dir);
 }
 
 static int arm_dma_set_mask(struct device *dev, u64 dma_mask);
@@ -138,6 +143,22 @@ struct dma_map_ops arm_dma_ops = {
 };
 EXPORT_SYMBOL(arm_dma_ops);
 
+static void *arm_coherent_dma_alloc(struct device *dev, size_t size,
+	dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs);
+static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr,
+				  dma_addr_t handle, struct dma_attrs *attrs);
+
+struct dma_map_ops arm_coherent_dma_ops = {
+	.alloc			= arm_coherent_dma_alloc,
+	.free			= arm_coherent_dma_free,
+	.mmap			= arm_dma_mmap,
+	.get_sgtable		= arm_dma_get_sgtable,
+	.map_page		= arm_coherent_dma_map_page,
+	.map_sg			= arm_dma_map_sg,
+	.set_dma_mask		= arm_dma_set_mask,
+};
+EXPORT_SYMBOL(arm_coherent_dma_ops);
+
 static u64 get_coherent_dma_mask(struct device *dev)
 {
 	u64 mask = (u64)arm_dma_limit;
@@ -586,7 +607,7 @@ static void *__alloc_simple_buffer(struct device *dev, size_t size, gfp_t gfp,
 
 
 static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
-			 gfp_t gfp, pgprot_t prot, const void *caller)
+			 gfp_t gfp, pgprot_t prot, bool is_coherent, const void *caller)
 {
 	u64 mask = get_coherent_dma_mask(dev);
 	struct page *page;
@@ -619,7 +640,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
 	*handle = DMA_ERROR_CODE;
 	size = PAGE_ALIGN(size);
 
-	if (arch_is_coherent() || nommu())
+	if (is_coherent || nommu())
 		addr = __alloc_simple_buffer(dev, size, gfp, &page);
 	else if (gfp & GFP_ATOMIC)
 		addr = __alloc_from_pool(size, &page);
@@ -647,7 +668,20 @@ void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
 	if (dma_alloc_from_coherent(dev, size, handle, &memory))
 		return memory;
 
-	return __dma_alloc(dev, size, handle, gfp, prot,
+	return __dma_alloc(dev, size, handle, gfp, prot, false,
+			   __builtin_return_address(0));
+}
+
+static void *arm_coherent_dma_alloc(struct device *dev, size_t size,
+	dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs)
+{
+	pgprot_t prot = __get_dma_pgprot(attrs, pgprot_kernel);
+	void *memory;
+
+	if (dma_alloc_from_coherent(dev, size, handle, &memory))
+		return memory;
+
+	return __dma_alloc(dev, size, handle, gfp, prot, true,
 			   __builtin_return_address(0));
 }
 
@@ -684,8 +718,9 @@ int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
 /*
  * Free a buffer as defined by the above mapping.
  */
-void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
-		  dma_addr_t handle, struct dma_attrs *attrs)
+static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
+			   dma_addr_t handle, struct dma_attrs *attrs,
+			   bool is_coherent)
 {
 	struct page *page = pfn_to_page(dma_to_pfn(dev, handle));
 
@@ -694,7 +729,7 @@ void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
 
 	size = PAGE_ALIGN(size);
 
-	if (arch_is_coherent() || nommu()) {
+	if (is_coherent || nommu()) {
 		__dma_free_buffer(page, size);
 	} else if (__free_from_pool(cpu_addr, size)) {
 		return;
@@ -710,6 +745,18 @@ void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
 	}
 }
 
+void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
+		  dma_addr_t handle, struct dma_attrs *attrs)
+{
+	__arm_dma_free(dev, size, cpu_addr, handle, attrs, false);
+}
+
+static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr,
+				  dma_addr_t handle, struct dma_attrs *attrs)
+{
+	__arm_dma_free(dev, size, cpu_addr, handle, attrs, true);
+}
+
 int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
 		 void *cpu_addr, dma_addr_t handle, size_t size,
 		 struct dma_attrs *attrs)
@@ -1012,11 +1059,12 @@ static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, gfp_t
 		if (!pages[i])
 			goto error;
 
-		if (order)
+		if (order) {
 			split_page(pages[i], order);
-		j = 1 << order;
-		while (--j)
-			pages[i + j] = pages[i] + j;
+			j = 1 << order;
+			while (--j)
+				pages[i + j] = pages[i] + j;
+		}
 
 		__dma_clear_buffer(pages[i], PAGE_SIZE << order);
 		i += 1 << order;
@@ -1303,7 +1351,8 @@ static int arm_iommu_get_sgtable(struct device *dev, struct sg_table *sgt,
  */
 static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
 			  size_t size, dma_addr_t *handle,
-			  enum dma_data_direction dir, struct dma_attrs *attrs)
+			  enum dma_data_direction dir, struct dma_attrs *attrs,
+			  bool is_coherent)
 {
 	struct dma_iommu_mapping *mapping = dev->archdata.mapping;
 	dma_addr_t iova, iova_base;
@@ -1322,8 +1371,8 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
 		phys_addr_t phys = page_to_phys(sg_page(s));
 		unsigned int len = PAGE_ALIGN(s->offset + s->length);
 
-		if (!arch_is_coherent() &&
-		    !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
+		if (!is_coherent &&
+			!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
 			__dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
 
 		ret = iommu_map(mapping->domain, iova, phys, len, 0);
@@ -1341,20 +1390,9 @@ fail:
 	return ret;
 }
 
-/**
- * arm_iommu_map_sg - map a set of SG buffers for streaming mode DMA
- * @dev: valid struct device pointer
- * @sg: list of buffers
- * @nents: number of buffers to map
- * @dir: DMA transfer direction
- *
- * Map a set of buffers described by scatterlist in streaming mode for DMA.
- * The scatter gather list elements are merged together (if possible) and
- * tagged with the appropriate dma address and length. They are obtained via
- * sg_dma_{address,length}.
- */
-int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
-		     enum dma_data_direction dir, struct dma_attrs *attrs)
+static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+		     enum dma_data_direction dir, struct dma_attrs *attrs,
+		     bool is_coherent)
 {
 	struct scatterlist *s = sg, *dma = sg, *start = sg;
 	int i, count = 0;
@@ -1370,7 +1408,7 @@ int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 
 		if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) {
 			if (__map_sg_chunk(dev, start, size, &dma->dma_address,
-			    dir, attrs) < 0)
+			    dir, attrs, is_coherent) < 0)
 				goto bad_mapping;
 
 			dma->dma_address += offset;
@@ -1383,7 +1421,8 @@ int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 		}
 		size += s->length;
 	}
-	if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs) < 0)
+	if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs,
+		is_coherent) < 0)
 		goto bad_mapping;
 
 	dma->dma_address += offset;
@@ -1398,17 +1437,44 @@ bad_mapping:
 }
 
 /**
- * arm_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
+ * arm_coherent_iommu_map_sg - map a set of SG buffers for streaming mode DMA
  * @dev: valid struct device pointer
  * @sg: list of buffers
- * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
- * @dir: DMA transfer direction (same as was passed to dma_map_sg)
+ * @nents: number of buffers to map
+ * @dir: DMA transfer direction
  *
- * Unmap a set of streaming mode DMA translations.  Again, CPU access
- * rules concerning calls here are the same as for dma_unmap_single().
+ * Map a set of i/o coherent buffers described by scatterlist in streaming
+ * mode for DMA. The scatter gather list elements are merged together (if
+ * possible) and tagged with the appropriate dma address and length. They are
+ * obtained via sg_dma_{address,length}.
  */
-void arm_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
-			enum dma_data_direction dir, struct dma_attrs *attrs)
+int arm_coherent_iommu_map_sg(struct device *dev, struct scatterlist *sg,
+		int nents, enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+	return __iommu_map_sg(dev, sg, nents, dir, attrs, true);
+}
+
+/**
+ * arm_iommu_map_sg - map a set of SG buffers for streaming mode DMA
+ * @dev: valid struct device pointer
+ * @sg: list of buffers
+ * @nents: number of buffers to map
+ * @dir: DMA transfer direction
+ *
+ * Map a set of buffers described by scatterlist in streaming mode for DMA.
+ * The scatter gather list elements are merged together (if possible) and
+ * tagged with the appropriate dma address and length. They are obtained via
+ * sg_dma_{address,length}.
+ */
+int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg,
+		int nents, enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+	return __iommu_map_sg(dev, sg, nents, dir, attrs, false);
+}
+
+static void __iommu_unmap_sg(struct device *dev, struct scatterlist *sg,
+		int nents, enum dma_data_direction dir, struct dma_attrs *attrs,
+		bool is_coherent)
 {
 	struct scatterlist *s;
 	int i;
@@ -1417,7 +1483,7 @@ void arm_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
 		if (sg_dma_len(s))
 			__iommu_remove_mapping(dev, sg_dma_address(s),
 					       sg_dma_len(s));
-		if (!arch_is_coherent() &&
+		if (!is_coherent &&
 		    !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
 			__dma_page_dev_to_cpu(sg_page(s), s->offset,
 					      s->length, dir);
@@ -1425,6 +1491,38 @@ void arm_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
 }
 
 /**
+ * arm_coherent_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
+ * @dev: valid struct device pointer
+ * @sg: list of buffers
+ * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
+ * @dir: DMA transfer direction (same as was passed to dma_map_sg)
+ *
+ * Unmap a set of streaming mode DMA translations.  Again, CPU access
+ * rules concerning calls here are the same as for dma_unmap_single().
+ */
+void arm_coherent_iommu_unmap_sg(struct device *dev, struct scatterlist *sg,
+		int nents, enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+	__iommu_unmap_sg(dev, sg, nents, dir, attrs, true);
+}
+
+/**
+ * arm_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
+ * @dev: valid struct device pointer
+ * @sg: list of buffers
+ * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
+ * @dir: DMA transfer direction (same as was passed to dma_map_sg)
+ *
+ * Unmap a set of streaming mode DMA translations.  Again, CPU access
+ * rules concerning calls here are the same as for dma_unmap_single().
+ */
+void arm_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
+			enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+	__iommu_unmap_sg(dev, sg, nents, dir, attrs, false);
+}
+
+/**
  * arm_iommu_sync_sg_for_cpu
  * @dev: valid struct device pointer
  * @sg: list of buffers
@@ -1438,8 +1536,7 @@ void arm_iommu_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 	int i;
 
 	for_each_sg(sg, s, nents, i)
-		if (!arch_is_coherent())
-			__dma_page_dev_to_cpu(sg_page(s), s->offset, s->length, dir);
+		__dma_page_dev_to_cpu(sg_page(s), s->offset, s->length, dir);
 
 }
 
@@ -1457,22 +1554,21 @@ void arm_iommu_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 	int i;
 
 	for_each_sg(sg, s, nents, i)
-		if (!arch_is_coherent())
-			__dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
+		__dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
 }
 
 
 /**
- * arm_iommu_map_page
+ * arm_coherent_iommu_map_page
  * @dev: valid struct device pointer
  * @page: page that buffer resides in
  * @offset: offset into page for start of buffer
  * @size: size of buffer to map
  * @dir: DMA transfer direction
  *
- * IOMMU aware version of arm_dma_map_page()
+ * Coherent IOMMU aware version of arm_dma_map_page()
  */
-static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page,
+static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *page,
 	     unsigned long offset, size_t size, enum dma_data_direction dir,
 	     struct dma_attrs *attrs)
 {
@@ -1480,9 +1576,6 @@ static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page,
 	dma_addr_t dma_addr;
 	int ret, len = PAGE_ALIGN(size + offset);
 
-	if (!arch_is_coherent() && !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
-		__dma_page_cpu_to_dev(page, offset, size, dir);
-
 	dma_addr = __alloc_iova(mapping, len);
 	if (dma_addr == DMA_ERROR_CODE)
 		return dma_addr;
@@ -1498,6 +1591,51 @@ fail:
 }
 
 /**
+ * arm_iommu_map_page
+ * @dev: valid struct device pointer
+ * @page: page that buffer resides in
+ * @offset: offset into page for start of buffer
+ * @size: size of buffer to map
+ * @dir: DMA transfer direction
+ *
+ * IOMMU aware version of arm_dma_map_page()
+ */
+static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page,
+	     unsigned long offset, size_t size, enum dma_data_direction dir,
+	     struct dma_attrs *attrs)
+{
+	if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
+		__dma_page_cpu_to_dev(page, offset, size, dir);
+
+	return arm_coherent_iommu_map_page(dev, page, offset, size, dir, attrs);
+}
+
+/**
+ * arm_coherent_iommu_unmap_page
+ * @dev: valid struct device pointer
+ * @handle: DMA address of buffer
+ * @size: size of buffer (same as passed to dma_map_page)
+ * @dir: DMA transfer direction (same as passed to dma_map_page)
+ *
+ * Coherent IOMMU aware version of arm_dma_unmap_page()
+ */
+static void arm_coherent_iommu_unmap_page(struct device *dev, dma_addr_t handle,
+		size_t size, enum dma_data_direction dir,
+		struct dma_attrs *attrs)
+{
+	struct dma_iommu_mapping *mapping = dev->archdata.mapping;
+	dma_addr_t iova = handle & PAGE_MASK;
+	int offset = handle & ~PAGE_MASK;
+	int len = PAGE_ALIGN(size + offset);
+
+	if (!iova)
+		return;
+
+	iommu_unmap(mapping->domain, iova, len);
+	__free_iova(mapping, iova, len);
+}
+
+/**
  * arm_iommu_unmap_page
  * @dev: valid struct device pointer
  * @handle: DMA address of buffer
@@ -1519,7 +1657,7 @@ static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle,
 	if (!iova)
 		return;
 
-	if (!arch_is_coherent() && !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
+	if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
 		__dma_page_dev_to_cpu(page, offset, size, dir);
 
 	iommu_unmap(mapping->domain, iova, len);
@@ -1537,8 +1675,7 @@ static void arm_iommu_sync_single_for_cpu(struct device *dev,
 	if (!iova)
 		return;
 
-	if (!arch_is_coherent())
-		__dma_page_dev_to_cpu(page, offset, size, dir);
+	__dma_page_dev_to_cpu(page, offset, size, dir);
 }
 
 static void arm_iommu_sync_single_for_device(struct device *dev,
@@ -1572,6 +1709,19 @@ struct dma_map_ops iommu_ops = {
 	.sync_sg_for_device	= arm_iommu_sync_sg_for_device,
 };
 
+struct dma_map_ops iommu_coherent_ops = {
+	.alloc		= arm_iommu_alloc_attrs,
+	.free		= arm_iommu_free_attrs,
+	.mmap		= arm_iommu_mmap_attrs,
+	.get_sgtable	= arm_iommu_get_sgtable,
+
+	.map_page	= arm_coherent_iommu_map_page,
+	.unmap_page	= arm_coherent_iommu_unmap_page,
+
+	.map_sg		= arm_coherent_iommu_map_sg,
+	.unmap_sg	= arm_coherent_iommu_unmap_sg,
+};
+
 /**
  * arm_iommu_create_mapping
  * @bus: pointer to the bus holding the client device (for IOMMU calls)
@@ -1665,7 +1815,7 @@ int arm_iommu_attach_device(struct device *dev,
 	dev->archdata.mapping = mapping;
 	set_dma_ops(dev, &iommu_ops);
 
-	pr_info("Attached IOMMU controller to %s device.\n", dev_name(dev));
+	pr_debug("Attached IOMMU controller to %s device.\n", dev_name(dev));
 	return 0;
 }
 
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 566750fa57d..9d869f93a3d 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -36,6 +36,7 @@
 #include <asm/system_info.h>
 
 #include <asm/mach/map.h>
+#include <asm/mach/pci.h>
 #include "mm.h"
 
 int ioremap_page(unsigned long virt, unsigned long phys,
@@ -383,3 +384,16 @@ void __arm_iounmap(volatile void __iomem *io_addr)
 	arch_iounmap(io_addr);
 }
 EXPORT_SYMBOL(__arm_iounmap);
+
+#ifdef CONFIG_PCI
+int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
+{
+	BUG_ON(offset + SZ_64K > IO_SPACE_LIMIT);
+
+	return ioremap_page_range(PCI_IO_VIRT_BASE + offset,
+				  PCI_IO_VIRT_BASE + offset + SZ_64K,
+				  phys_addr,
+				  __pgprot(get_mem_type(MT_DEVICE)->prot_pte));
+}
+EXPORT_SYMBOL_GPL(pci_ioremap_io);
+#endif
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index c2fa21d0103..941dfb9e9a7 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -31,6 +31,7 @@
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
+#include <asm/mach/pci.h>
 
 #include "mm.h"
 
@@ -216,7 +217,7 @@ static struct mem_type mem_types[] = {
 		.prot_l1	= PMD_TYPE_TABLE,
 		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_WB,
 		.domain		= DOMAIN_IO,
-	},	
+	},
 	[MT_DEVICE_WC] = {	/* ioremap_wc */
 		.prot_pte	= PROT_PTE_DEVICE | L_PTE_MT_DEV_WC,
 		.prot_l1	= PMD_TYPE_TABLE,
@@ -422,17 +423,6 @@ static void __init build_mem_type_table(void)
 	vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;
 
 	/*
-	 * Enable CPU-specific coherency if supported.
-	 * (Only available on XSC3 at the moment.)
-	 */
-	if (arch_is_coherent() && cpu_is_xsc3()) {
-		mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
-		mem_types[MT_MEMORY].prot_pte |= L_PTE_SHARED;
-		mem_types[MT_MEMORY_DMA_READY].prot_pte |= L_PTE_SHARED;
-		mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_S;
-		mem_types[MT_MEMORY_NONCACHED].prot_pte |= L_PTE_SHARED;
-	}
-	/*
 	 * ARMv6 and above have extended page tables.
 	 */
 	if (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP)) {
@@ -777,14 +767,27 @@ void __init iotable_init(struct map_desc *io_desc, int nr)
 		create_mapping(md);
 		vm->addr = (void *)(md->virtual & PAGE_MASK);
 		vm->size = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK));
-		vm->phys_addr = __pfn_to_phys(md->pfn); 
-		vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING; 
+		vm->phys_addr = __pfn_to_phys(md->pfn);
+		vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING;
 		vm->flags |= VM_ARM_MTYPE(md->type);
 		vm->caller = iotable_init;
 		vm_area_add_early(vm++);
 	}
 }
 
+void __init vm_reserve_area_early(unsigned long addr, unsigned long size,
+				  void *caller)
+{
+	struct vm_struct *vm;
+
+	vm = early_alloc_aligned(sizeof(*vm), __alignof__(*vm));
+	vm->addr = (void *)addr;
+	vm->size = size;
+	vm->flags = VM_IOREMAP | VM_ARM_EMPTY_MAPPING;
+	vm->caller = caller;
+	vm_area_add_early(vm);
+}
+
 #ifndef CONFIG_ARM_LPAE
 
 /*
@@ -802,14 +805,7 @@ void __init iotable_init(struct map_desc *io_desc, int nr)
 
 static void __init pmd_empty_section_gap(unsigned long addr)
 {
-	struct vm_struct *vm;
-
-	vm = early_alloc_aligned(sizeof(*vm), __alignof__(*vm));
-	vm->addr = (void *)addr;
-	vm->size = SECTION_SIZE;
-	vm->flags = VM_IOREMAP | VM_ARM_EMPTY_MAPPING;
-	vm->caller = pmd_empty_section_gap;
-	vm_area_add_early(vm);
+	vm_reserve_area_early(addr, SECTION_SIZE, pmd_empty_section_gap);
 }
 
 static void __init fill_pmd_gaps(void)
@@ -858,6 +854,28 @@ static void __init fill_pmd_gaps(void)
 #define fill_pmd_gaps() do { } while (0)
 #endif
 
+#if defined(CONFIG_PCI) && !defined(CONFIG_NEED_MACH_IO_H)
+static void __init pci_reserve_io(void)
+{
+	struct vm_struct *vm;
+	unsigned long addr;
+
+	/* we're still single threaded hence no lock needed here */
+	for (vm = vmlist; vm; vm = vm->next) {
+		if (!(vm->flags & VM_ARM_STATIC_MAPPING))
+			continue;
+		addr = (unsigned long)vm->addr;
+		addr &= ~(SZ_2M - 1);
+		if (addr == PCI_IO_VIRT_BASE)
+			return;
+
+	}
+	vm_reserve_area_early(PCI_IO_VIRT_BASE, SZ_2M, pci_reserve_io);
+}
+#else
+#define pci_reserve_io() do { } while (0)
+#endif
+
 static void * __initdata vmalloc_min =
 	(void *)(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET);
 
@@ -1141,6 +1159,9 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
 		mdesc->map_io();
 	fill_pmd_gaps();
 
+	/* Reserve fixed i/o space in VMALLOC region */
+	pci_reserve_io();
+
 	/*
 	 * Finally flush the caches and tlb to ensure that we're in a
 	 * consistent state wrt the writebuffer.  This also ensures that