1 #ifndef __ASM_SH_PCI_H
2 #define __ASM_SH_PCI_H
3
4 #ifdef __KERNEL__
5
6 /* Can be used to override the logic in pci_scan_bus for skipping
7 already-configured bus numbers - to be used for buggy BIOSes
8 or architectures with incomplete PCI setup by the loader */
9
10 #define pcibios_assign_all_busses() 0
11
12 /* These are currently the correct values for the STM overdrive board.
13 * We need some way of setting this on a board specific way, it will
14 * not be the same on other boards I think
15 */
16 #if 1 /* def CONFIG_SH_OVERDRIVE */
17 #define PCIBIOS_MIN_IO 0x2000
18 #define PCIBIOS_MIN_MEM 0x10000000
19 #endif
20
21 static inline void pcibios_set_master(struct pci_dev *dev)
22 {
23 /* No special bus mastering setup handling */
24 }
25
26 static inline void pcibios_penalize_isa_irq(int irq)
27 {
28 /* We don't do dynamic PCI IRQ allocation */
29 }
30
31 /* Dynamic DMA mapping stuff.
32 * SuperH has everything mapped statically like x86.
33 */
34
35 #include <linux/types.h>
36 #include <linux/slab.h>
37 #include <asm/scatterlist.h>
38 #include <linux/string.h>
39 #include <asm/io.h>
40
41 struct pci_dev;
42
43 /* Allocate and map kernel buffer using consistent mode DMA for a device.
44 * hwdev should be valid struct pci_dev pointer for PCI devices,
45 * NULL for PCI-like buses (ISA, EISA).
46 * Returns non-NULL cpu-view pointer to the buffer if successful and
47 * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
48 * is undefined.
49 */
50 extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
51 dma_addr_t *dma_handle);
52
53 /* Free and unmap a consistent DMA buffer.
54 * cpu_addr is what was returned from pci_alloc_consistent,
55 * size must be the same as what as passed into pci_alloc_consistent,
56 * and likewise dma_addr must be the same as what *dma_addrp was set to.
57 *
58 * References to the memory and mappings associated with cpu_addr/dma_addr
59 * past this call are illegal.
60 */
61 extern void pci_free_consistent(struct pci_dev *hwdev, size_t size,
62 void *vaddr, dma_addr_t dma_handle);
63
64 /* Map a single buffer of the indicated size for DMA in streaming mode.
65 * The 32-bit bus address to use is returned.
66 *
67 * Once the device is given the dma address, the device owns this memory
68 * until either pci_unmap_single or pci_dma_sync_single is performed.
69 */
70 static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
71 size_t size,int directoin)
72 {
73 return virt_to_bus(ptr);
74 }
75
76 /* Unmap a single streaming mode DMA translation. The dma_addr and size
77 * must match what was provided for in a previous pci_map_single call. All
78 * other usages are undefined.
79 *
80 * After this call, reads by the cpu to the buffer are guarenteed to see
81 * whatever the device wrote there.
82 */
83 static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
84 size_t size,int direction)
85 {
86 /* Nothing to do */
87 }
88
89 /* Map a set of buffers described by scatterlist in streaming
90 * mode for DMA. This is the scather-gather version of the
91 * above pci_map_single interface. Here the scatter gather list
92 * elements are each tagged with the appropriate dma address
93 * and length. They are obtained via sg_dma_{address,length}(SG).
94 *
95 * NOTE: An implementation may be able to use a smaller number of
96 * DMA address/length pairs than there are SG table elements.
97 * (for example via virtual mapping capabilities)
98 * The routine returns the number of addr/length pairs actually
99 * used, at most nents.
100 *
101 * Device ownership issues as mentioned above for pci_map_single are
102 * the same here.
103 */
104 static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
105 int nents,int direction)
106 {
107 return nents;
108 }
109
110 /* Unmap a set of streaming mode DMA translations.
111 * Again, cpu read rules concerning calls here are the same as for
112 * pci_unmap_single() above.
113 */
114 static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
115 int nents,int direction)
116 {
117 /* Nothing to do */
118 }
119
120 /* Make physical memory consistent for a single
121 * streaming mode DMA translation after a transfer.
122 *
123 * If you perform a pci_map_single() but wish to interrogate the
124 * buffer using the cpu, yet do not wish to teardown the PCI dma
125 * mapping, you must call this function before doing so. At the
126 * next point you give the PCI dma address back to the card, the
127 * device again owns the buffer.
128 */
129 static inline void pci_dma_sync_single(struct pci_dev *hwdev,
130 dma_addr_t dma_handle,
131 size_t size,int direction)
132 {
133 /* Nothing to do */
134 }
135
136 /* Make physical memory consistent for a set of streaming
137 * mode DMA translations after a transfer.
138 *
139 * The same as pci_dma_sync_single but for a scatter-gather list,
140 * same rules and usage.
141 */
142 static inline void pci_dma_sync_sg(struct pci_dev *hwdev,
143 struct scatterlist *sg,
144 int nelems,int direction)
145 {
146 /* Nothing to do */
147 }
148
149 /* These macros should be used after a pci_map_sg call has been done
150 * to get bus addresses of each of the SG entries and their lengths.
151 * You should only work with the number of sg entries pci_map_sg
152 * returns, or alternatively stop on the first sg_dma_len(sg) which
153 * is 0.
154 */
155 #define sg_dma_address(sg) (virt_to_bus((sg)->address))
156 #define sg_dma_len(sg) ((sg)->length)
157
158 #endif /* __KERNEL__ */
159
160
161 #endif /* __ASM_SH_PCI_H */
162
163
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