1 #ifndef __SPARC_PCI_H
2 #define __SPARC_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 #define PCIBIOS_MIN_IO 0UL
13 #define PCIBIOS_MIN_MEM 0UL
14
15 extern inline void pcibios_set_master(struct pci_dev *dev)
16 {
17 /* No special bus mastering setup handling */
18 }
19
20 extern inline void pcibios_penalize_isa_irq(int irq)
21 {
22 /* We don't do dynamic PCI IRQ allocation */
23 }
24
25 /* Dynamic DMA mapping stuff.
26 */
27
28 #include <asm/scatterlist.h>
29
30 struct pci_dev;
31
32 /* Allocate and map kernel buffer using consistent mode DMA for a device.
33 * hwdev should be valid struct pci_dev pointer for PCI devices.
34 */
35 extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle);
36
37 /* Free and unmap a consistent DMA buffer.
38 * cpu_addr is what was returned from pci_alloc_consistent,
39 * size must be the same as what as passed into pci_alloc_consistent,
40 * and likewise dma_addr must be the same as what *dma_addrp was set to.
41 *
42 * References to the memory and mappings assosciated with cpu_addr/dma_addr
43 * past this call are illegal.
44 */
45 extern void pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle);
46
47 /* Map a single buffer of the indicated size for DMA in streaming mode.
48 * The 32-bit bus address to use is returned.
49 *
50 * Once the device is given the dma address, the device owns this memory
51 * until either pci_unmap_single or pci_dma_sync_single is performed.
52 */
53 extern dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction);
54
55 /* Unmap a single streaming mode DMA translation. The dma_addr and size
56 * must match what was provided for in a previous pci_map_single call. All
57 * other usages are undefined.
58 *
59 * After this call, reads by the cpu to the buffer are guarenteed to see
60 * whatever the device wrote there.
61 */
62 extern void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction);
63
64 /* Map a set of buffers described by scatterlist in streaming
65 * mode for DMA. This is the scather-gather version of the
66 * above pci_map_single interface. Here the scatter gather list
67 * elements are each tagged with the appropriate dma address
68 * and length. They are obtained via sg_dma_{address,length}(SG).
69 *
70 * NOTE: An implementation may be able to use a smaller number of
71 * DMA address/length pairs than there are SG table elements.
72 * (for example via virtual mapping capabilities)
73 * The routine returns the number of addr/length pairs actually
74 * used, at most nents.
75 *
76 * Device ownership issues as mentioned above for pci_map_single are
77 * the same here.
78 */
79 extern int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction);
80
81 /* Unmap a set of streaming mode DMA translations.
82 * Again, cpu read rules concerning calls here are the same as for
83 * pci_unmap_single() above.
84 */
85 extern void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nhwents, int direction);
86
87 /* Make physical memory consistent for a single
88 * streaming mode DMA translation after a transfer.
89 *
90 * If you perform a pci_map_single() but wish to interrogate the
91 * buffer using the cpu, yet do not wish to teardown the PCI dma
92 * mapping, you must call this function before doing so. At the
93 * next point you give the PCI dma address back to the card, the
94 * device again owns the buffer.
95 */
96 extern void pci_dma_sync_single(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction);
97
98 /* Make physical memory consistent for a set of streaming
99 * mode DMA translations after a transfer.
100 *
101 * The same as pci_dma_sync_single but for a scatter-gather list,
102 * same rules and usage.
103 */
104 extern void pci_dma_sync_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction);
105
106 /* Return whether the given PCI device DMA address mask can
107 * be supported properly. For example, if your device can
108 * only drive the low 24-bits during PCI bus mastering, then
109 * you would pass 0x00ffffff as the mask to this function.
110 */
111 extern inline int pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask)
112 {
113 return 1;
114 }
115
116 #endif /* __KERNEL__ */
117
118 #endif /* __SPARC_PCI_H */
119
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