Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6
[pandora-kernel.git] / arch / ia64 / hp / common / hwsw_iommu.c
1 /*
2  * Copyright (c) 2004 Hewlett-Packard Development Company, L.P.
3  *   Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4  *
5  * This is a pseudo I/O MMU which dispatches to the hardware I/O MMU
6  * whenever possible.  We assume that the hardware I/O MMU requires
7  * full 32-bit addressability, as is the case, e.g., for HP zx1-based
8  * systems (there, the I/O MMU window is mapped at 3-4GB).  If a
9  * device doesn't provide full 32-bit addressability, we fall back on
10  * the sw I/O TLB.  This is good enough to let us support broken
11  * hardware such as soundcards which have a DMA engine that can
12  * address only 28 bits.
13  */
14
15 #include <linux/device.h>
16
17 #include <asm/machvec.h>
18
19 /* swiotlb declarations & definitions: */
20 extern int swiotlb_late_init_with_default_size (size_t size);
21 extern ia64_mv_dma_alloc_coherent       swiotlb_alloc_coherent;
22 extern ia64_mv_dma_free_coherent        swiotlb_free_coherent;
23 extern ia64_mv_dma_map_single_attrs     swiotlb_map_single_attrs;
24 extern ia64_mv_dma_unmap_single_attrs   swiotlb_unmap_single_attrs;
25 extern ia64_mv_dma_map_sg_attrs         swiotlb_map_sg_attrs;
26 extern ia64_mv_dma_unmap_sg_attrs       swiotlb_unmap_sg_attrs;
27 extern ia64_mv_dma_supported            swiotlb_dma_supported;
28 extern ia64_mv_dma_mapping_error        swiotlb_dma_mapping_error;
29
30 /* hwiommu declarations & definitions: */
31
32 extern ia64_mv_dma_alloc_coherent       sba_alloc_coherent;
33 extern ia64_mv_dma_free_coherent        sba_free_coherent;
34 extern ia64_mv_dma_map_single_attrs     sba_map_single_attrs;
35 extern ia64_mv_dma_unmap_single_attrs   sba_unmap_single_attrs;
36 extern ia64_mv_dma_map_sg_attrs         sba_map_sg_attrs;
37 extern ia64_mv_dma_unmap_sg_attrs       sba_unmap_sg_attrs;
38 extern ia64_mv_dma_supported            sba_dma_supported;
39 extern ia64_mv_dma_mapping_error        sba_dma_mapping_error;
40
41 #define hwiommu_alloc_coherent          sba_alloc_coherent
42 #define hwiommu_free_coherent           sba_free_coherent
43 #define hwiommu_map_single_attrs        sba_map_single_attrs
44 #define hwiommu_unmap_single_attrs      sba_unmap_single_attrs
45 #define hwiommu_map_sg_attrs            sba_map_sg_attrs
46 #define hwiommu_unmap_sg_attrs          sba_unmap_sg_attrs
47 #define hwiommu_dma_supported           sba_dma_supported
48 #define hwiommu_dma_mapping_error       sba_dma_mapping_error
49 #define hwiommu_sync_single_for_cpu     machvec_dma_sync_single
50 #define hwiommu_sync_sg_for_cpu         machvec_dma_sync_sg
51 #define hwiommu_sync_single_for_device  machvec_dma_sync_single
52 #define hwiommu_sync_sg_for_device      machvec_dma_sync_sg
53
54
55 /*
56  * Note: we need to make the determination of whether or not to use
57  * the sw I/O TLB based purely on the device structure.  Anything else
58  * would be unreliable or would be too intrusive.
59  */
60 static inline int
61 use_swiotlb (struct device *dev)
62 {
63         return dev && dev->dma_mask && !hwiommu_dma_supported(dev, *dev->dma_mask);
64 }
65
66 void __init
67 hwsw_init (void)
68 {
69         /* default to a smallish 2MB sw I/O TLB */
70         if (swiotlb_late_init_with_default_size (2 * (1<<20)) != 0) {
71 #ifdef CONFIG_IA64_GENERIC
72                 /* Better to have normal DMA than panic */
73                 printk(KERN_WARNING "%s: Failed to initialize software I/O TLB,"
74                        " reverting to hpzx1 platform vector\n", __func__);
75                 machvec_init("hpzx1");
76 #else
77                 panic("Unable to initialize software I/O TLB services");
78 #endif
79         }
80 }
81
82 void *
83 hwsw_alloc_coherent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flags)
84 {
85         if (use_swiotlb(dev))
86                 return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
87         else
88                 return hwiommu_alloc_coherent(dev, size, dma_handle, flags);
89 }
90
91 void
92 hwsw_free_coherent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle)
93 {
94         if (use_swiotlb(dev))
95                 swiotlb_free_coherent(dev, size, vaddr, dma_handle);
96         else
97                 hwiommu_free_coherent(dev, size, vaddr, dma_handle);
98 }
99
100 dma_addr_t
101 hwsw_map_single_attrs(struct device *dev, void *addr, size_t size, int dir,
102                        struct dma_attrs *attrs)
103 {
104         if (use_swiotlb(dev))
105                 return swiotlb_map_single_attrs(dev, addr, size, dir, attrs);
106         else
107                 return hwiommu_map_single_attrs(dev, addr, size, dir, attrs);
108 }
109 EXPORT_SYMBOL(hwsw_map_single_attrs);
110
111 void
112 hwsw_unmap_single_attrs(struct device *dev, dma_addr_t iova, size_t size,
113                          int dir, struct dma_attrs *attrs)
114 {
115         if (use_swiotlb(dev))
116                 return swiotlb_unmap_single_attrs(dev, iova, size, dir, attrs);
117         else
118                 return hwiommu_unmap_single_attrs(dev, iova, size, dir, attrs);
119 }
120 EXPORT_SYMBOL(hwsw_unmap_single_attrs);
121
122 int
123 hwsw_map_sg_attrs(struct device *dev, struct scatterlist *sglist, int nents,
124                    int dir, struct dma_attrs *attrs)
125 {
126         if (use_swiotlb(dev))
127                 return swiotlb_map_sg_attrs(dev, sglist, nents, dir, attrs);
128         else
129                 return hwiommu_map_sg_attrs(dev, sglist, nents, dir, attrs);
130 }
131 EXPORT_SYMBOL(hwsw_map_sg_attrs);
132
133 void
134 hwsw_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist, int nents,
135                      int dir, struct dma_attrs *attrs)
136 {
137         if (use_swiotlb(dev))
138                 return swiotlb_unmap_sg_attrs(dev, sglist, nents, dir, attrs);
139         else
140                 return hwiommu_unmap_sg_attrs(dev, sglist, nents, dir, attrs);
141 }
142 EXPORT_SYMBOL(hwsw_unmap_sg_attrs);
143
144 void
145 hwsw_sync_single_for_cpu (struct device *dev, dma_addr_t addr, size_t size, int dir)
146 {
147         if (use_swiotlb(dev))
148                 swiotlb_sync_single_for_cpu(dev, addr, size, dir);
149         else
150                 hwiommu_sync_single_for_cpu(dev, addr, size, dir);
151 }
152
153 void
154 hwsw_sync_sg_for_cpu (struct device *dev, struct scatterlist *sg, int nelems, int dir)
155 {
156         if (use_swiotlb(dev))
157                 swiotlb_sync_sg_for_cpu(dev, sg, nelems, dir);
158         else
159                 hwiommu_sync_sg_for_cpu(dev, sg, nelems, dir);
160 }
161
162 void
163 hwsw_sync_single_for_device (struct device *dev, dma_addr_t addr, size_t size, int dir)
164 {
165         if (use_swiotlb(dev))
166                 swiotlb_sync_single_for_device(dev, addr, size, dir);
167         else
168                 hwiommu_sync_single_for_device(dev, addr, size, dir);
169 }
170
171 void
172 hwsw_sync_sg_for_device (struct device *dev, struct scatterlist *sg, int nelems, int dir)
173 {
174         if (use_swiotlb(dev))
175                 swiotlb_sync_sg_for_device(dev, sg, nelems, dir);
176         else
177                 hwiommu_sync_sg_for_device(dev, sg, nelems, dir);
178 }
179
180 int
181 hwsw_dma_supported (struct device *dev, u64 mask)
182 {
183         if (hwiommu_dma_supported(dev, mask))
184                 return 1;
185         return swiotlb_dma_supported(dev, mask);
186 }
187
188 int
189 hwsw_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
190 {
191         return hwiommu_dma_mapping_error(dev, dma_addr) ||
192                 swiotlb_dma_mapping_error(dev, dma_addr);
193 }
194
195 EXPORT_SYMBOL(hwsw_dma_mapping_error);
196 EXPORT_SYMBOL(hwsw_dma_supported);
197 EXPORT_SYMBOL(hwsw_alloc_coherent);
198 EXPORT_SYMBOL(hwsw_free_coherent);
199 EXPORT_SYMBOL(hwsw_sync_single_for_cpu);
200 EXPORT_SYMBOL(hwsw_sync_single_for_device);
201 EXPORT_SYMBOL(hwsw_sync_sg_for_cpu);
202 EXPORT_SYMBOL(hwsw_sync_sg_for_device);