powerpc/dma: use the generic direct mapping bypass

Now that we've switched all the powerpc nommu and swiotlb methods to
use the generic dma_direct_* calls we can remove these ops vectors
entirely and rely on the common direct mapping bypass that avoids
indirect function calls entirely.  This also allows to remove a whole
lot of boilerplate code related to setting up these operations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

5 files changed, 2 insertions, 123 deletions

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 9bb12cd642ef..8809e287b80d 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -36,7 +36,7 @@ obj-y				:= cputable.o ptrace.o syscalls.o \
 				   process.o systbl.o idle.o \
 				   signal.o sysfs.o cacheinfo.o time.o \
 				   prom.o traps.o setup-common.o \
-				   udbg.o misc.o io.o dma.o misc_$(BITS).o \
+				   udbg.o misc.o io.o misc_$(BITS).o \
 				   of_platform.o prom_parse.o
 obj-$(CONFIG_PPC64)		+= setup_64.o sys_ppc32.o \
 				   signal_64.o ptrace32.o \
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 3a15a7d945e9..132d61c91629 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -10,70 +10,12 @@
  * option) any later version.
  *
  */
-
-#include <linux/dma-direct.h>
 #include <linux/memblock.h>
-#include <linux/pfn.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.h>
-#include <linux/pci.h>
-
 #include <asm/machdep.h>
 #include <asm/swiotlb.h>
-#include <asm/dma.h>
 
 unsigned int ppc_swiotlb_enable;
 
-/*
- * At the moment, all platforms that use this code only require
- * swiotlb to be used if we're operating on HIGHMEM.  Since
- * we don't ever call anything other than map_sg, unmap_sg,
- * map_page, and unmap_page on highmem, use normal dma_ops
- * for everything else.
- */
-const struct dma_map_ops powerpc_swiotlb_dma_ops = {
-	.alloc = dma_direct_alloc,
-	.free = dma_direct_free,
-	.map_sg = dma_direct_map_sg,
-	.unmap_sg = dma_direct_unmap_sg,
-	.dma_supported = dma_direct_supported,
-	.map_page = dma_direct_map_page,
-	.unmap_page = dma_direct_unmap_page,
-	.sync_single_for_cpu = dma_direct_sync_single_for_cpu,
-	.sync_single_for_device = dma_direct_sync_single_for_device,
-	.sync_sg_for_cpu = dma_direct_sync_sg_for_cpu,
-	.sync_sg_for_device = dma_direct_sync_sg_for_device,
-	.get_required_mask = dma_direct_get_required_mask,
-};
-
-static int ppc_swiotlb_bus_notify(struct notifier_block *nb,
-				  unsigned long action, void *data)
-{
-	struct device *dev = data;
-
-	/* We are only intereted in device addition */
-	if (action != BUS_NOTIFY_ADD_DEVICE)
-		return 0;
-
-	/* May need to bounce if the device can't address all of DRAM */
-	if ((dma_get_mask(dev) + 1) < memblock_end_of_DRAM())
-		set_dma_ops(dev, &powerpc_swiotlb_dma_ops);
-
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block ppc_swiotlb_plat_bus_notifier = {
-	.notifier_call = ppc_swiotlb_bus_notify,
-	.priority = 0,
-};
-
-int __init swiotlb_setup_bus_notifier(void)
-{
-	bus_register_notifier(&platform_bus_type,
-			      &ppc_swiotlb_plat_bus_notifier);
-	return 0;
-}
-
 void __init swiotlb_detect_4g(void)
 {
 	if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
deleted file mode 100644
index b9f7283e7224..000000000000
--- a/arch/powerpc/kernel/dma.c
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
- *
- * Provide default implementations of the DMA mapping callbacks for
- * directly mapped busses.
- */
-
-#include <linux/device.h>
-#include <linux/dma-direct.h>
-#include <linux/dma-debug.h>
-#include <linux/gfp.h>
-#include <linux/memblock.h>
-#include <linux/export.h>
-#include <linux/pci.h>
-#include <asm/vio.h>
-#include <asm/bug.h>
-#include <asm/machdep.h>
-#include <asm/swiotlb.h>
-#include <asm/iommu.h>
-
-/*
- * Generic direct DMA implementation
- *
- * This implementation supports a per-device offset that can be applied if
- * the address at which memory is visible to devices is not 0. Platform code
- * can set archdata.dma_data to an unsigned long holding the offset. By
- * default the offset is PCI_DRAM_OFFSET.
- */
-
-const struct dma_map_ops dma_nommu_ops = {
-#ifdef CONFIG_NOT_COHERENT_CACHE
-	.alloc				= __dma_nommu_alloc_coherent,
-	.free				= __dma_nommu_free_coherent,
-#else
-	.alloc				= dma_direct_alloc,
-	.free				= dma_direct_free,
-#endif
-	.map_sg				= dma_direct_map_sg,
-	.dma_supported			= dma_direct_supported,
-	.map_page			= dma_direct_map_page,
-	.get_required_mask		= dma_direct_get_required_mask,
-#ifdef CONFIG_NOT_COHERENT_CACHE
-	.unmap_sg			= dma_direct_unmap_sg,
-	.unmap_page			= dma_direct_unmap_page,
-	.sync_single_for_cpu 		= dma_direct_sync_single_for_cpu,
-	.sync_single_for_device 	= dma_direct_sync_single_for_device,
-	.sync_sg_for_cpu 		= dma_direct_sync_sg_for_cpu,
-	.sync_sg_for_device 		= dma_direct_sync_sg_for_device,
-#endif
-};
-EXPORT_SYMBOL(dma_nommu_ops);
-
-static int __init dma_init(void)
-{
-#ifdef CONFIG_IBMVIO
-	dma_debug_add_bus(&vio_bus_type);
-#endif
-
-       return 0;
-}
-fs_initcall(dma_init);
-
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index a84707680525..23989175349c 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -62,7 +62,7 @@ resource_size_t isa_mem_base;
 EXPORT_SYMBOL(isa_mem_base);
 
 
-static const struct dma_map_ops *pci_dma_ops = &dma_nommu_ops;
+static const struct dma_map_ops *pci_dma_ops;
 
 void set_pci_dma_ops(const struct dma_map_ops *dma_ops)
 {
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index ca00fbb97cf8..fa606aa98f6d 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -791,7 +791,6 @@ void arch_setup_pdev_archdata(struct platform_device *pdev)
 {
 	pdev->archdata.dma_mask = DMA_BIT_MASK(32);
 	pdev->dev.dma_mask = &pdev->archdata.dma_mask;
- 	set_dma_ops(&pdev->dev, &dma_nommu_ops);
 }
 
 static __init void print_system_info(void)