hexagon: use generic dma_noncoherent_ops

Switch to the generic noncoherent direct mapping implementation.

Signed-off-by: Christoph Hellwig <hch@lst.de>

4 files changed, 11 insertions, 180 deletions

diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index 89a4b22f34d9..6cee842a9b44 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -4,6 +4,7 @@ comment "Linux Kernel Configuration for Hexagon"
 
 config HEXAGON
         def_bool y
+        select ARCH_HAS_SYNC_DMA_FOR_DEVICE
         select ARCH_NO_PREEMPT
         select HAVE_OPROFILE
         # Other pending projects/to-do items.
@@ -29,6 +30,7 @@ config HEXAGON
         select GENERIC_CLOCKEVENTS_BROADCAST
         select MODULES_USE_ELF_RELA
         select GENERIC_CPU_DEVICES
+        select DMA_NONCOHERENT_OPS
         ---help---
           Qualcomm Hexagon is a processor architecture designed for high
           performance and low power across a wide variety of applications.
diff --git a/arch/hexagon/include/asm/Kbuild b/arch/hexagon/include/asm/Kbuild
index dd2fd9c0d292..47c4da3d64a4 100644
--- a/arch/hexagon/include/asm/Kbuild
+++ b/arch/hexagon/include/asm/Kbuild
@@ -6,6 +6,7 @@ generic-y += compat.h
 generic-y += current.h
 generic-y += device.h
 generic-y += div64.h
+generic-y += dma-mapping.h
 generic-y += emergency-restart.h
 generic-y += extable.h
 generic-y += fb.h
diff --git a/arch/hexagon/include/asm/dma-mapping.h b/arch/hexagon/include/asm/dma-mapping.h
deleted file mode 100644
index 263f6acbfb0f..000000000000
--- a/arch/hexagon/include/asm/dma-mapping.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * DMA operations for the Hexagon architecture
- *
- * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- */
-
-#ifndef _ASM_DMA_MAPPING_H
-#define _ASM_DMA_MAPPING_H
-
-#include <linux/types.h>
-#include <linux/cache.h>
-#include <linux/mm.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-debug.h>
-#include <asm/io.h>
-
-struct device;
-
-extern const struct dma_map_ops *dma_ops;
-
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
-        return dma_ops;
-}
-
-#endif
diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c
index 9e46556a227d..ffc4ae8e126f 100644
--- a/arch/hexagon/kernel/dma.c
+++ b/arch/hexagon/kernel/dma.c
@@ -18,32 +18,19 @@
  * 02110-1301, USA.
  */
 
-#include <linux/dma-mapping.h>
-#include <linux/dma-direct.h>
+#include <linux/dma-noncoherent.h>
 #include <linux/bootmem.h>
 #include <linux/genalloc.h>
-#include <asm/dma-mapping.h>
 #include <linux/module.h>
 #include <asm/page.h>
 
-#define HEXAGON_MAPPING_ERROR   0
-
-const struct dma_map_ops *dma_ops;
-EXPORT_SYMBOL(dma_ops);
-
-static inline void *dma_addr_to_virt(dma_addr_t dma_addr)
-{
-        return phys_to_virt((unsigned long) dma_addr);
-}
-
 static struct gen_pool *coherent_pool;
 
 
 /* Allocates from a pool of uncached memory that was reserved at boot time */
 
-static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size,
-                                 dma_addr_t *dma_addr, gfp_t flag,
-                                 unsigned long attrs)
+void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_addr,
+                gfp_t flag, unsigned long attrs)
 {
         void *ret;
 
@@ -75,58 +62,17 @@ static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size,
         return ret;
 }
 
-static void hexagon_free_coherent(struct device *dev, size_t size, void *vaddr,
-                                  dma_addr_t dma_addr, unsigned long attrs)
+void arch_dma_free(struct device *dev, size_t size, void *vaddr,
+                dma_addr_t dma_addr, unsigned long attrs)
 {
         gen_pool_free(coherent_pool, (unsigned long) vaddr, size);
 }
 
-static int check_addr(const char *name, struct device *hwdev,
-                      dma_addr_t bus, size_t size)
-{
-        if (hwdev && hwdev->dma_mask && !dma_capable(hwdev, bus, size)) {
-                if (*hwdev->dma_mask >= DMA_BIT_MASK(32))
-                        printk(KERN_ERR
-                                "%s: overflow %Lx+%zu of device mask %Lx\n",
-                                name, (long long)bus, size,
-                                (long long)*hwdev->dma_mask);
-                return 0;
-        }
-        return 1;
-}
-
-static int hexagon_map_sg(struct device *hwdev, struct scatterlist *sg,
-                          int nents, enum dma_data_direction dir,
-                          unsigned long attrs)
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+                size_t size, enum dma_data_direction dir)
 {
-        struct scatterlist *s;
-        int i;
-
-        WARN_ON(nents == 0 || sg[0].length == 0);
-
-        for_each_sg(sg, s, nents, i) {
-                s->dma_address = sg_phys(s);
-                if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
-                        return 0;
-
-                s->dma_length = s->length;
+        void *addr = phys_to_virt(paddr);
 
-                if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
-                        continue;
-
-                flush_dcache_range(dma_addr_to_virt(s->dma_address),
-                                   dma_addr_to_virt(s->dma_address + s->length));
-        }
-
-        return nents;
-}
-
-/*
- * address is virtual
- */
-static inline void dma_sync(void *addr, size_t size,
-                            enum dma_data_direction dir)
-{
         switch (dir) {
         case DMA_TO_DEVICE:
                 hexagon_clean_dcache_range((unsigned long) addr,
@@ -144,81 +90,3 @@ static inline void dma_sync(void *addr, size_t size,
                 BUG();
         }
 }
-
-/**
- * hexagon_map_page() - maps an address for device DMA
- * @dev:        pointer to DMA device
- * @page:       pointer to page struct of DMA memory
- * @offset:     offset within page
- * @size:       size of memory to map
- * @dir:        transfer direction
- * @attrs:      pointer to DMA attrs (not used)
- *
- * Called to map a memory address to a DMA address prior
- * to accesses to/from device.
- *
- * We don't particularly have many hoops to jump through
- * so far.  Straight translation between phys and virtual.
- *
- * DMA is not cache coherent so sync is necessary; this
- * seems to be a convenient place to do it.
- *
- */
-static dma_addr_t hexagon_map_page(struct device *dev, struct page *page,
-                                   unsigned long offset, size_t size,
-                                   enum dma_data_direction dir,
-                                   unsigned long attrs)
-{
-        dma_addr_t bus = page_to_phys(page) + offset;
-        WARN_ON(size == 0);
-
-        if (!check_addr("map_single", dev, bus, size))
-                return HEXAGON_MAPPING_ERROR;
-
-        if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
-                dma_sync(dma_addr_to_virt(bus), size, dir);
-
-        return bus;
-}
-
-static void hexagon_sync_single_for_device(struct device *dev,
-                                        dma_addr_t dma_handle, size_t size,
-                                        enum dma_data_direction dir)
-{
-        dma_sync(dma_addr_to_virt(dma_handle), size, dir);
-}
-
-static void hexagon_sync_sg_for_device(struct device *dev,
-                struct scatterlist *sgl, int nents, enum dma_data_direction dir)
-{
-        struct scatterlist *sg;
-        int i;
-
-        for_each_sg(sgl, sg, nents, i)
-                hexagon_sync_single_for_device(dev, sg_dma_address(sg),
-                                sg->length, dir);
-}
-
-
-static int hexagon_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
-        return dma_addr == HEXAGON_MAPPING_ERROR;
-}
-
-const struct dma_map_ops hexagon_dma_ops = {
-        .alloc          = hexagon_dma_alloc_coherent,
-        .free           = hexagon_free_coherent,
-        .map_sg         = hexagon_map_sg,
-        .map_page       = hexagon_map_page,
-        .sync_single_for_device = hexagon_sync_single_for_device,
-        .sync_sg_for_device = hexagon_sync_sg_for_device,
-        .mapping_error  = hexagon_mapping_error,
-};
-
-void __init hexagon_dma_init(void)
-{
-        if (dma_ops)
-                return;
-
-        dma_ops = &hexagon_dma_ops;
-}