tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __SPARC_PCI_H
2#define __SPARC_PCI_H
3
4#ifdef __KERNEL__
5
6#include <linux/dma-mapping.h>
7
8/* Can be used to override the logic in pci_scan_bus for skipping
9 * already-configured bus numbers - to be used for buggy BIOSes
10 * or architectures with incomplete PCI setup by the loader.
11 */
12#define pcibios_assign_all_busses() 0
13#define pcibios_scan_all_fns(a, b) 0
14
15#define PCIBIOS_MIN_IO 0UL
16#define PCIBIOS_MIN_MEM 0UL
17
18#define PCI_IRQ_NONE 0xffffffff
19
20static inline void pcibios_set_master(struct pci_dev *dev)
21{
22 /* No special bus mastering setup handling */
23}
24
25static inline void pcibios_penalize_isa_irq(int irq, int active)
26{
27 /* We don't do dynamic PCI IRQ allocation */
28}
29
30/* Dynamic DMA mapping stuff.
31 */
32#define PCI_DMA_BUS_IS_PHYS (0)
33
34#include <asm/scatterlist.h>
35
36struct pci_dev;
37
38/* Allocate and map kernel buffer using consistent mode DMA for a device.
39 * hwdev should be valid struct pci_dev pointer for PCI devices.
40 */
41extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle);
42
43/* Free and unmap a consistent DMA buffer.
44 * cpu_addr is what was returned from pci_alloc_consistent,
45 * size must be the same as what as passed into pci_alloc_consistent,
46 * and likewise dma_addr must be the same as what *dma_addrp was set to.
47 *
48 * References to the memory and mappings assosciated with cpu_addr/dma_addr
49 * past this call are illegal.
50 */
51extern void pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle);
52
53/* Map a single buffer of the indicated size for DMA in streaming mode.
54 * The 32-bit bus address to use is returned.
55 *
56 * Once the device is given the dma address, the device owns this memory
57 * until either pci_unmap_single or pci_dma_sync_single_for_cpu is performed.
58 */
59extern dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction);
60
61/* Unmap a single streaming mode DMA translation. The dma_addr and size
62 * must match what was provided for in a previous pci_map_single call. All
63 * other usages are undefined.
64 *
65 * After this call, reads by the cpu to the buffer are guaranteed to see
66 * whatever the device wrote there.
67 */
68extern void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction);
69
70/* pci_unmap_{single,page} is not a nop, thus... */
71#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) \
72 dma_addr_t ADDR_NAME;
73#define DECLARE_PCI_UNMAP_LEN(LEN_NAME) \
74 __u32 LEN_NAME;
75#define pci_unmap_addr(PTR, ADDR_NAME) \
76 ((PTR)->ADDR_NAME)
77#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) \
78 (((PTR)->ADDR_NAME) = (VAL))
79#define pci_unmap_len(PTR, LEN_NAME) \
80 ((PTR)->LEN_NAME)
81#define pci_unmap_len_set(PTR, LEN_NAME, VAL) \
82 (((PTR)->LEN_NAME) = (VAL))
83
84/*
85 * Same as above, only with pages instead of mapped addresses.
86 */
87extern dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
88 unsigned long offset, size_t size, int direction);
89extern void pci_unmap_page(struct pci_dev *hwdev,
90 dma_addr_t dma_address, size_t size, int direction);
91
92/* Map a set of buffers described by scatterlist in streaming
93 * mode for DMA. This is the scather-gather version of the
94 * above pci_map_single interface. Here the scatter gather list
95 * elements are each tagged with the appropriate dma address
96 * and length. They are obtained via sg_dma_{address,length}(SG).
97 *
98 * NOTE: An implementation may be able to use a smaller number of
99 * DMA address/length pairs than there are SG table elements.
100 * (for example via virtual mapping capabilities)
101 * The routine returns the number of addr/length pairs actually
102 * used, at most nents.
103 *
104 * Device ownership issues as mentioned above for pci_map_single are
105 * the same here.
106 */
107extern int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction);
108
109/* Unmap a set of streaming mode DMA translations.
110 * Again, cpu read rules concerning calls here are the same as for
111 * pci_unmap_single() above.
112 */
113extern void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nhwents, int direction);
114
115/* Make physical memory consistent for a single
116 * streaming mode DMA translation after a transfer.
117 *
118 * If you perform a pci_map_single() but wish to interrogate the
119 * buffer using the cpu, yet do not wish to teardown the PCI dma
120 * mapping, you must call this function before doing so. At the
121 * next point you give the PCI dma address back to the card, you
122 * must first perform a pci_dma_sync_for_device, and then the device
123 * again owns the buffer.
124 */
125extern void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction);
126extern void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction);
127
128/* Make physical memory consistent for a set of streaming
129 * mode DMA translations after a transfer.
130 *
131 * The same as pci_dma_sync_single_* but for a scatter-gather list,
132 * same rules and usage.
133 */
134extern void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction);
135extern void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction);
136
137/* Return whether the given PCI device DMA address mask can
138 * be supported properly. For example, if your device can
139 * only drive the low 24-bits during PCI bus mastering, then
140 * you would pass 0x00ffffff as the mask to this function.
141 */
142static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
143{
144 return 1;
145}
146
147#ifdef CONFIG_PCI
148static inline void pci_dma_burst_advice(struct pci_dev *pdev,
149 enum pci_dma_burst_strategy *strat,
150 unsigned long *strategy_parameter)
151{
152 *strat = PCI_DMA_BURST_INFINITY;
153 *strategy_parameter = ~0UL;
154}
155#endif
156
157#define PCI_DMA_ERROR_CODE (~(dma_addr_t)0x0)
158
159static inline int pci_dma_mapping_error(struct pci_dev *pdev,
160 dma_addr_t dma_addr)
161{
162 return (dma_addr == PCI_DMA_ERROR_CODE);
163}
164
165struct device_node;
166extern struct device_node *pci_device_to_OF_node(struct pci_dev *pdev);
167
168#endif /* __KERNEL__ */
169
170/* generic pci stuff */
171#include <asm-generic/pci.h>
172
173#endif /* __SPARC_PCI_H */