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-rw-r--r--arch/powerpc/kernel/Makefile2
-rw-r--r--arch/powerpc/kernel/dma-iommu.c103
-rw-r--r--arch/powerpc/kernel/dma.c98
3 files changed, 105 insertions, 98 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index ab7d4cbf1e00..09b3cabf2f91 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -73,7 +73,7 @@ obj-y += time.o prom.o traps.o setup-common.o \
73 udbg.o misc.o io.o \ 73 udbg.o misc.o io.o \
74 misc_$(CONFIG_WORD_SIZE).o 74 misc_$(CONFIG_WORD_SIZE).o
75obj-$(CONFIG_PPC32) += entry_32.o setup_32.o 75obj-$(CONFIG_PPC32) += entry_32.o setup_32.o
76obj-$(CONFIG_PPC64) += dma.o iommu.o 76obj-$(CONFIG_PPC64) += dma.o dma-iommu.o iommu.o
77obj-$(CONFIG_KGDB) += kgdb.o 77obj-$(CONFIG_KGDB) += kgdb.o
78obj-$(CONFIG_PPC_MULTIPLATFORM) += prom_init.o 78obj-$(CONFIG_PPC_MULTIPLATFORM) += prom_init.o
79obj-$(CONFIG_MODULES) += ppc_ksyms.o 79obj-$(CONFIG_MODULES) += ppc_ksyms.o
diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
new file mode 100644
index 000000000000..01091f1d508c
--- /dev/null
+++ b/arch/powerpc/kernel/dma-iommu.c
@@ -0,0 +1,103 @@
1/*
2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
3 *
4 * Provide default implementations of the DMA mapping callbacks for
5 * busses using the iommu infrastructure
6 */
7
8#include <asm/iommu.h>
9
10/*
11 * Generic iommu implementation
12 */
13
14/* Allocates a contiguous real buffer and creates mappings over it.
15 * Returns the virtual address of the buffer and sets dma_handle
16 * to the dma address (mapping) of the first page.
17 */
18static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
19 dma_addr_t *dma_handle, gfp_t flag)
20{
21 return iommu_alloc_coherent(dev, dev->archdata.dma_data, size,
22 dma_handle, device_to_mask(dev), flag,
23 dev->archdata.numa_node);
24}
25
26static void dma_iommu_free_coherent(struct device *dev, size_t size,
27 void *vaddr, dma_addr_t dma_handle)
28{
29 iommu_free_coherent(dev->archdata.dma_data, size, vaddr, dma_handle);
30}
31
32/* Creates TCEs for a user provided buffer. The user buffer must be
33 * contiguous real kernel storage (not vmalloc). The address of the buffer
34 * passed here is the kernel (virtual) address of the buffer. The buffer
35 * need not be page aligned, the dma_addr_t returned will point to the same
36 * byte within the page as vaddr.
37 */
38static dma_addr_t dma_iommu_map_single(struct device *dev, void *vaddr,
39 size_t size,
40 enum dma_data_direction direction,
41 struct dma_attrs *attrs)
42{
43 return iommu_map_single(dev, dev->archdata.dma_data, vaddr, size,
44 device_to_mask(dev), direction, attrs);
45}
46
47
48static void dma_iommu_unmap_single(struct device *dev, dma_addr_t dma_handle,
49 size_t size,
50 enum dma_data_direction direction,
51 struct dma_attrs *attrs)
52{
53 iommu_unmap_single(dev->archdata.dma_data, dma_handle, size, direction,
54 attrs);
55}
56
57
58static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
59 int nelems, enum dma_data_direction direction,
60 struct dma_attrs *attrs)
61{
62 return iommu_map_sg(dev, dev->archdata.dma_data, sglist, nelems,
63 device_to_mask(dev), direction, attrs);
64}
65
66static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist,
67 int nelems, enum dma_data_direction direction,
68 struct dma_attrs *attrs)
69{
70 iommu_unmap_sg(dev->archdata.dma_data, sglist, nelems, direction,
71 attrs);
72}
73
74/* We support DMA to/from any memory page via the iommu */
75static int dma_iommu_dma_supported(struct device *dev, u64 mask)
76{
77 struct iommu_table *tbl = dev->archdata.dma_data;
78
79 if (!tbl || tbl->it_offset > mask) {
80 printk(KERN_INFO
81 "Warning: IOMMU offset too big for device mask\n");
82 if (tbl)
83 printk(KERN_INFO
84 "mask: 0x%08lx, table offset: 0x%08lx\n",
85 mask, tbl->it_offset);
86 else
87 printk(KERN_INFO "mask: 0x%08lx, table unavailable\n",
88 mask);
89 return 0;
90 } else
91 return 1;
92}
93
94struct dma_mapping_ops dma_iommu_ops = {
95 .alloc_coherent = dma_iommu_alloc_coherent,
96 .free_coherent = dma_iommu_free_coherent,
97 .map_single = dma_iommu_map_single,
98 .unmap_single = dma_iommu_unmap_single,
99 .map_sg = dma_iommu_map_sg,
100 .unmap_sg = dma_iommu_unmap_sg,
101 .dma_supported = dma_iommu_dma_supported,
102};
103EXPORT_SYMBOL(dma_iommu_ops);
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index ae5708e3a312..44e3486419e1 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -2,111 +2,15 @@
2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation 2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
3 * 3 *
4 * Provide default implementations of the DMA mapping callbacks for 4 * Provide default implementations of the DMA mapping callbacks for
5 * directly mapped busses and busses using the iommu infrastructure 5 * directly mapped busses.
6 */ 6 */
7 7
8#include <linux/device.h> 8#include <linux/device.h>
9#include <linux/dma-mapping.h> 9#include <linux/dma-mapping.h>
10#include <asm/bug.h> 10#include <asm/bug.h>
11#include <asm/iommu.h>
12#include <asm/abs_addr.h> 11#include <asm/abs_addr.h>
13 12
14/* 13/*
15 * Generic iommu implementation
16 */
17
18/* Allocates a contiguous real buffer and creates mappings over it.
19 * Returns the virtual address of the buffer and sets dma_handle
20 * to the dma address (mapping) of the first page.
21 */
22static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
23 dma_addr_t *dma_handle, gfp_t flag)
24{
25 return iommu_alloc_coherent(dev, dev->archdata.dma_data, size,
26 dma_handle, device_to_mask(dev), flag,
27 dev->archdata.numa_node);
28}
29
30static void dma_iommu_free_coherent(struct device *dev, size_t size,
31 void *vaddr, dma_addr_t dma_handle)
32{
33 iommu_free_coherent(dev->archdata.dma_data, size, vaddr, dma_handle);
34}
35
36/* Creates TCEs for a user provided buffer. The user buffer must be
37 * contiguous real kernel storage (not vmalloc). The address of the buffer
38 * passed here is the kernel (virtual) address of the buffer. The buffer
39 * need not be page aligned, the dma_addr_t returned will point to the same
40 * byte within the page as vaddr.
41 */
42static dma_addr_t dma_iommu_map_single(struct device *dev, void *vaddr,
43 size_t size,
44 enum dma_data_direction direction,
45 struct dma_attrs *attrs)
46{
47 return iommu_map_single(dev, dev->archdata.dma_data, vaddr, size,
48 device_to_mask(dev), direction, attrs);
49}
50
51
52static void dma_iommu_unmap_single(struct device *dev, dma_addr_t dma_handle,
53 size_t size,
54 enum dma_data_direction direction,
55 struct dma_attrs *attrs)
56{
57 iommu_unmap_single(dev->archdata.dma_data, dma_handle, size, direction,
58 attrs);
59}
60
61
62static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
63 int nelems, enum dma_data_direction direction,
64 struct dma_attrs *attrs)
65{
66 return iommu_map_sg(dev, dev->archdata.dma_data, sglist, nelems,
67 device_to_mask(dev), direction, attrs);
68}
69
70static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist,
71 int nelems, enum dma_data_direction direction,
72 struct dma_attrs *attrs)
73{
74 iommu_unmap_sg(dev->archdata.dma_data, sglist, nelems, direction,
75 attrs);
76}
77
78/* We support DMA to/from any memory page via the iommu */
79static int dma_iommu_dma_supported(struct device *dev, u64 mask)
80{
81 struct iommu_table *tbl = dev->archdata.dma_data;
82
83 if (!tbl || tbl->it_offset > mask) {
84 printk(KERN_INFO
85 "Warning: IOMMU offset too big for device mask\n");
86 if (tbl)
87 printk(KERN_INFO
88 "mask: 0x%08lx, table offset: 0x%08lx\n",
89 mask, tbl->it_offset);
90 else
91 printk(KERN_INFO "mask: 0x%08lx, table unavailable\n",
92 mask);
93 return 0;
94 } else
95 return 1;
96}
97
98struct dma_mapping_ops dma_iommu_ops = {
99 .alloc_coherent = dma_iommu_alloc_coherent,
100 .free_coherent = dma_iommu_free_coherent,
101 .map_single = dma_iommu_map_single,
102 .unmap_single = dma_iommu_unmap_single,
103 .map_sg = dma_iommu_map_sg,
104 .unmap_sg = dma_iommu_unmap_sg,
105 .dma_supported = dma_iommu_dma_supported,
106};
107EXPORT_SYMBOL(dma_iommu_ops);
108
109/*
110 * Generic direct DMA implementation 14 * Generic direct DMA implementation
111 * 15 *
112 * This implementation supports a per-device offset that can be applied if 16 * This implementation supports a per-device offset that can be applied if
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-07 08:13:59 -0500