4 #include <linux/config.h>
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 */
13 extern unsigned int pcibios_assign_all_busses(void);
15 #define pcibios_assign_all_busses() 0
18 extern unsigned long pci_mem_start;
19 #define PCIBIOS_MIN_IO 0x1000
20 #define PCIBIOS_MIN_MEM (pci_mem_start)
22 void pcibios_set_master(struct pci_dev *dev);
23 void pcibios_penalize_isa_irq(int irq);
24 struct irq_routing_table *pcibios_get_irq_routing_table(void);
25 int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);
27 /* Dynamic DMA mapping stuff.
28 * i386 has everything mapped statically.
31 #include <linux/types.h>
32 #include <linux/slab.h>
33 #include <asm/scatterlist.h>
34 #include <linux/string.h>
39 /* The PCI address space does equal the physical memory
40 * address space. The networking and block device layers use
41 * this boolean for bounce buffer decisions.
43 #define PCI_DMA_BUS_IS_PHYS (1)
45 /* Allocate and map kernel buffer using consistent mode DMA for a device.
46 * hwdev should be valid struct pci_dev pointer for PCI devices,
47 * NULL for PCI-like buses (ISA, EISA).
48 * Returns non-NULL cpu-view pointer to the buffer if successful and
49 * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
52 extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
53 dma_addr_t *dma_handle);
55 /* Free and unmap a consistent DMA buffer.
56 * cpu_addr is what was returned from pci_alloc_consistent,
57 * size must be the same as what as passed into pci_alloc_consistent,
58 * and likewise dma_addr must be the same as what *dma_addrp was set to.
60 * References to the memory and mappings associated with cpu_addr/dma_addr
61 * past this call are illegal.
63 extern void pci_free_consistent(struct pci_dev *hwdev, size_t size,
64 void *vaddr, dma_addr_t dma_handle);
66 /* Map a single buffer of the indicated size for DMA in streaming mode.
67 * The 32-bit bus address to use is returned.
69 * Once the device is given the dma address, the device owns this memory
70 * until either pci_unmap_single or pci_dma_sync_single is performed.
72 static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
73 size_t size, int direction)
75 if (direction == PCI_DMA_NONE)
77 flush_write_buffers();
78 return virt_to_bus(ptr);
81 /* Unmap a single streaming mode DMA translation. The dma_addr and size
82 * must match what was provided for in a previous pci_map_single call. All
83 * other usages are undefined.
85 * After this call, reads by the cpu to the buffer are guarenteed to see
86 * whatever the device wrote there.
88 static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
89 size_t size, int direction)
91 if (direction == PCI_DMA_NONE)
97 * pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical
98 * to pci_map_single, but takes a struct page instead of a virtual address
100 static inline dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
101 unsigned long offset, size_t size, int direction)
103 if (direction == PCI_DMA_NONE)
106 return ((dma_addr_t)(page - mem_map) *
107 (dma_addr_t) PAGE_SIZE +
108 (dma_addr_t) offset);
111 static inline void pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
112 size_t size, int direction)
114 if (direction == PCI_DMA_NONE)
119 /* pci_unmap_{page,single} is a nop so... */
120 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
121 #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
122 #define pci_unmap_addr(PTR, ADDR_NAME) (0)
123 #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
124 #define pci_unmap_len(PTR, LEN_NAME) (0)
125 #define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
127 /* Map a set of buffers described by scatterlist in streaming
128 * mode for DMA. This is the scather-gather version of the
129 * above pci_map_single interface. Here the scatter gather list
130 * elements are each tagged with the appropriate dma address
131 * and length. They are obtained via sg_dma_{address,length}(SG).
133 * NOTE: An implementation may be able to use a smaller number of
134 * DMA address/length pairs than there are SG table elements.
135 * (for example via virtual mapping capabilities)
136 * The routine returns the number of addr/length pairs actually
137 * used, at most nents.
139 * Device ownership issues as mentioned above for pci_map_single are
142 static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
143 int nents, int direction)
147 if (direction == PCI_DMA_NONE)
153 for (i = 0; i < nents; i++ ) {
154 if (sg[i].address && sg[i].page)
156 else if (!sg[i].address && !sg[i].page)
160 sg[i].dma_address = virt_to_bus(sg[i].address);
162 sg[i].dma_address = page_to_bus(sg[i].page) + sg[i].offset;
165 flush_write_buffers();
169 /* Unmap a set of streaming mode DMA translations.
170 * Again, cpu read rules concerning calls here are the same as for
171 * pci_unmap_single() above.
173 static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
174 int nents, int direction)
176 if (direction == PCI_DMA_NONE)
181 /* Make physical memory consistent for a single
182 * streaming mode DMA translation after a transfer.
184 * If you perform a pci_map_single() but wish to interrogate the
185 * buffer using the cpu, yet do not wish to teardown the PCI dma
186 * mapping, you must call this function before doing so. At the
187 * next point you give the PCI dma address back to the card, the
188 * device again owns the buffer.
190 static inline void pci_dma_sync_single(struct pci_dev *hwdev,
191 dma_addr_t dma_handle,
192 size_t size, int direction)
194 if (direction == PCI_DMA_NONE)
196 flush_write_buffers();
199 /* Make physical memory consistent for a set of streaming
200 * mode DMA translations after a transfer.
202 * The same as pci_dma_sync_single but for a scatter-gather list,
203 * same rules and usage.
205 static inline void pci_dma_sync_sg(struct pci_dev *hwdev,
206 struct scatterlist *sg,
207 int nelems, int direction)
209 if (direction == PCI_DMA_NONE)
211 flush_write_buffers();
214 /* Return whether the given PCI device DMA address mask can
215 * be supported properly. For example, if your device can
216 * only drive the low 24-bits during PCI bus mastering, then
217 * you would pass 0x00ffffff as the mask to this function.
219 static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
222 * we fall back to GFP_DMA when the mask isn't all 1s,
223 * so we can't guarantee allocations that must be
224 * within a tighter range than GFP_DMA..
226 if(mask < 0x00ffffff)
232 /* This is always fine. */
233 #define pci_dac_dma_supported(pci_dev, mask) (1)
235 static __inline__ dma64_addr_t
236 pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
238 return ((dma64_addr_t) page_to_bus(page) +
239 (dma64_addr_t) offset);
242 static __inline__ struct page *
243 pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
245 unsigned long poff = (dma_addr >> PAGE_SHIFT);
247 return mem_map + poff;
250 static __inline__ unsigned long
251 pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
253 return (dma_addr & ~PAGE_MASK);
256 static __inline__ void
257 pci_dac_dma_sync_single(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
259 flush_write_buffers();
262 /* These macros should be used after a pci_map_sg call has been done
263 * to get bus addresses of each of the SG entries and their lengths.
264 * You should only work with the number of sg entries pci_map_sg
267 #define sg_dma_address(sg) ((sg)->dma_address)
268 #define sg_dma_len(sg) ((sg)->length)
270 /* Return the index of the PCI controller for device. */
271 static inline int pci_controller_num(struct pci_dev *dev)
276 #define HAVE_PCI_MMAP
277 extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
278 enum pci_mmap_state mmap_state, int write_combine);
280 #endif /* __KERNEL__ */
282 #endif /* __i386_PCI_H */