From a34a517ac96c6910a3a0aab9513035bfbed0020c Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Wed, 20 Jan 2016 15:01:29 -0800
Subject: avr32: convert to dma_map_ops

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 arch/avr32/mm/dma-coherent.c | 115 ++++++++++++++++++++++++++++++-------------
 1 file changed, 80 insertions(+), 35 deletions(-)

(limited to 'arch/avr32/mm/dma-coherent.c')

diff --git a/arch/avr32/mm/dma-coherent.c b/arch/avr32/mm/dma-coherent.c
index 50cdb5b10f0f..92cf1fb2b3e6 100644
--- a/arch/avr32/mm/dma-coherent.c
+++ b/arch/avr32/mm/dma-coherent.c
@@ -9,9 +9,14 @@
 #include <linux/dma-mapping.h>
 #include <linux/gfp.h>
 #include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/device.h>
+#include <linux/scatterlist.h>
 
-#include <asm/addrspace.h>
+#include <asm/processor.h>
 #include <asm/cacheflush.h>
+#include <asm/io.h>
+#include <asm/addrspace.h>
 
 void dma_cache_sync(struct device *dev, void *vaddr, size_t size, int direction)
 {
@@ -93,60 +98,100 @@ static void __dma_free(struct device *dev, size_t size,
 		__free_page(page++);
 }
 
-void *dma_alloc_coherent(struct device *dev, size_t size,
-			 dma_addr_t *handle, gfp_t gfp)
+static void *avr32_dma_alloc(struct device *dev, size_t size,
+		dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs)
 {
 	struct page *page;
-	void *ret = NULL;
+	dma_addr_t phys;
 
 	page = __dma_alloc(dev, size, handle, gfp);
-	if (page)
-		ret = phys_to_uncached(page_to_phys(page));
+	if (!page)
+		return NULL;
+	phys = page_to_phys(page);
 
-	return ret;
+	if (dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs)) {
+		/* Now, map the page into P3 with write-combining turned on */
+		*handle = phys;
+		return __ioremap(phys, size, _PAGE_BUFFER);
+	} else {
+		return phys_to_uncached(phys);
+	}
 }
-EXPORT_SYMBOL(dma_alloc_coherent);
 
-void dma_free_coherent(struct device *dev, size_t size,
-		       void *cpu_addr, dma_addr_t handle)
+static void avr32_dma_free(struct device *dev, size_t size,
+		void *cpu_addr, dma_addr_t handle, struct dma_attrs *attrs)
 {
-	void *addr = phys_to_cached(uncached_to_phys(cpu_addr));
 	struct page *page;
 
-	pr_debug("dma_free_coherent addr %p (phys %08lx) size %u\n",
-		 cpu_addr, (unsigned long)handle, (unsigned)size);
-	BUG_ON(!virt_addr_valid(addr));
-	page = virt_to_page(addr);
+	if (dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs)) {
+		iounmap(cpu_addr);
+
+		page = phys_to_page(handle);
+	} else {
+		void *addr = phys_to_cached(uncached_to_phys(cpu_addr));
+
+		pr_debug("avr32_dma_free addr %p (phys %08lx) size %u\n",
+			 cpu_addr, (unsigned long)handle, (unsigned)size);
+
+		BUG_ON(!virt_addr_valid(addr));
+		page = virt_to_page(addr);
+	}
+
 	__dma_free(dev, size, page, handle);
 }
-EXPORT_SYMBOL(dma_free_coherent);
 
-void *dma_alloc_writecombine(struct device *dev, size_t size,
-			     dma_addr_t *handle, gfp_t gfp)
+static dma_addr_t avr32_dma_map_page(struct device *dev, struct page *page,
+		unsigned long offset, size_t size,
+		enum dma_data_direction direction, struct dma_attrs *attrs)
 {
-	struct page *page;
-	dma_addr_t phys;
+	void *cpu_addr = page_address(page) + offset;
 
-	page = __dma_alloc(dev, size, handle, gfp);
-	if (!page)
-		return NULL;
+	dma_cache_sync(dev, cpu_addr, size, direction);
+	return virt_to_bus(cpu_addr);
+}
 
-	phys = page_to_phys(page);
-	*handle = phys;
+static int avr32_dma_map_sg(struct device *dev, struct scatterlist *sglist,
+		int nents, enum dma_data_direction direction,
+		struct dma_attrs *attrs)
+{
+	int i;
+	struct scatterlist *sg;
+
+	for_each_sg(sglist, sg, nents, i) {
+		char *virt;
 
-	/* Now, map the page into P3 with write-combining turned on */
-	return __ioremap(phys, size, _PAGE_BUFFER);
+		sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
+		virt = sg_virt(sg);
+		dma_cache_sync(dev, virt, sg->length, direction);
+	}
+
+	return nents;
 }
-EXPORT_SYMBOL(dma_alloc_writecombine);
 
-void dma_free_writecombine(struct device *dev, size_t size,
-			   void *cpu_addr, dma_addr_t handle)
+static void avr32_dma_sync_single_for_device(struct device *dev,
+		dma_addr_t dma_handle, size_t size,
+		enum dma_data_direction direction)
 {
-	struct page *page;
+	dma_cache_sync(dev, bus_to_virt(dma_handle), size, direction);
+}
 
-	iounmap(cpu_addr);
+static void avr32_dma_sync_sg_for_device(struct device *dev,
+		struct scatterlist *sglist, int nents,
+		enum dma_data_direction direction)
+{
+	int i;
+	struct scatterlist *sg;
 
-	page = phys_to_page(handle);
-	__dma_free(dev, size, page, handle);
+	for_each_sg(sglist, sg, nents, i)
+		dma_cache_sync(dev, sg_virt(sg), sg->length, direction);
 }
-EXPORT_SYMBOL(dma_free_writecombine);
+
+struct dma_map_ops avr32_dma_ops = {
+	.alloc			= avr32_dma_alloc,
+	.free			= avr32_dma_free,
+	.map_page		= avr32_dma_map_page,
+	.map_sg			= avr32_dma_map_sg,
+	.sync_single_for_device	= avr32_dma_sync_single_for_device,
+	.sync_sg_for_device	= avr32_dma_sync_sg_for_device,
+};
+EXPORT_SYMBOL(avr32_dma_ops);
-- 
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