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
17 #define pcibios_scan_all_fns() 0
19 extern unsigned long pci_mem_start;
20 #define PCIBIOS_MIN_IO 0x1000
21 #define PCIBIOS_MIN_MEM (pci_mem_start)
23 void pcibios_config_init(void);
24 struct pci_bus * pcibios_scan_root(int bus);
25 extern int (*pci_config_read)(int seg, int bus, int dev, int fn, int reg, int len, u32 *value);
26 extern int (*pci_config_write)(int seg, int bus, int dev, int fn, int reg, int len, u32 value);
28 void pcibios_set_master(struct pci_dev *dev);
29 void pcibios_penalize_isa_irq(int irq);
30 struct irq_routing_table *pcibios_get_irq_routing_table(void);
31 int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);
33 /* Dynamic DMA mapping stuff.
34 * i386 has everything mapped statically.
37 #include <linux/types.h>
38 #include <linux/slab.h>
39 #include <asm/scatterlist.h>
40 #include <linux/string.h>
45 /* The PCI address space does equal the physical memory
46 * address space. The networking and block device layers use
47 * this boolean for bounce buffer decisions.
49 #define PCI_DMA_BUS_IS_PHYS (1)
51 /* Allocate and map kernel buffer using consistent mode DMA for a device.
52 * hwdev should be valid struct pci_dev pointer for PCI devices,
53 * NULL for PCI-like buses (ISA, EISA).
54 * Returns non-NULL cpu-view pointer to the buffer if successful and
55 * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
58 extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
59 dma_addr_t *dma_handle);
61 /* Free and unmap a consistent DMA buffer.
62 * cpu_addr is what was returned from pci_alloc_consistent,
63 * size must be the same as what as passed into pci_alloc_consistent,
64 * and likewise dma_addr must be the same as what *dma_addrp was set to.
66 * References to the memory and mappings associated with cpu_addr/dma_addr
67 * past this call are illegal.
69 extern void pci_free_consistent(struct pci_dev *hwdev, size_t size,
70 void *vaddr, dma_addr_t dma_handle);
72 /* Map a single buffer of the indicated size for DMA in streaming mode.
73 * The 32-bit bus address to use is returned.
75 * Once the device is given the dma address, the device owns this memory
76 * until either pci_unmap_single or pci_dma_sync_single is performed.
78 static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
79 size_t size, int direction)
81 if (direction == PCI_DMA_NONE)
83 flush_write_buffers();
84 return virt_to_bus(ptr);
87 /* Unmap a single streaming mode DMA translation. The dma_addr and size
88 * must match what was provided for in a previous pci_map_single call. All
89 * other usages are undefined.
91 * After this call, reads by the cpu to the buffer are guarenteed to see
92 * whatever the device wrote there.
94 static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
95 size_t size, int direction)
97 if (direction == PCI_DMA_NONE)
103 * pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical
104 * to pci_map_single, but takes a struct page instead of a virtual address
106 static inline dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
107 unsigned long offset, size_t size, int direction)
109 if (direction == PCI_DMA_NONE)
112 return ((dma_addr_t)(page - mem_map) *
113 (dma_addr_t) PAGE_SIZE +
114 (dma_addr_t) offset);
117 static inline void pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
118 size_t size, int direction)
120 if (direction == PCI_DMA_NONE)
125 /* pci_unmap_{page,single} is a nop so... */
126 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
127 #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
128 #define pci_unmap_addr(PTR, ADDR_NAME) (0)
129 #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
130 #define pci_unmap_len(PTR, LEN_NAME) (0)
131 #define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
133 /* Map a set of buffers described by scatterlist in streaming
134 * mode for DMA. This is the scather-gather version of the
135 * above pci_map_single interface. Here the scatter gather list
136 * elements are each tagged with the appropriate dma address
137 * and length. They are obtained via sg_dma_{address,length}(SG).
139 * NOTE: An implementation may be able to use a smaller number of
140 * DMA address/length pairs than there are SG table elements.
141 * (for example via virtual mapping capabilities)
142 * The routine returns the number of addr/length pairs actually
143 * used, at most nents.
145 * Device ownership issues as mentioned above for pci_map_single are
148 static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
149 int nents, int direction)
153 if (direction == PCI_DMA_NONE)
159 for (i = 0; i < nents; i++ ) {
160 if (sg[i].address && sg[i].page)
162 else if (!sg[i].address && !sg[i].page)
166 sg[i].dma_address = virt_to_bus(sg[i].address);
168 sg[i].dma_address = page_to_bus(sg[i].page) + sg[i].offset;
171 flush_write_buffers();
175 /* Unmap a set of streaming mode DMA translations.
176 * Again, cpu read rules concerning calls here are the same as for
177 * pci_unmap_single() above.
179 static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
180 int nents, int direction)
182 if (direction == PCI_DMA_NONE)
187 /* Make physical memory consistent for a single
188 * streaming mode DMA translation after a transfer.
190 * If you perform a pci_map_single() but wish to interrogate the
191 * buffer using the cpu, yet do not wish to teardown the PCI dma
192 * mapping, you must call this function before doing so. At the
193 * next point you give the PCI dma address back to the card, the
194 * device again owns the buffer.
196 static inline void pci_dma_sync_single(struct pci_dev *hwdev,
197 dma_addr_t dma_handle,
198 size_t size, int direction)
200 if (direction == PCI_DMA_NONE)
202 flush_write_buffers();
205 /* Make physical memory consistent for a set of streaming
206 * mode DMA translations after a transfer.
208 * The same as pci_dma_sync_single but for a scatter-gather list,
209 * same rules and usage.
211 static inline void pci_dma_sync_sg(struct pci_dev *hwdev,
212 struct scatterlist *sg,
213 int nelems, int direction)
215 if (direction == PCI_DMA_NONE)
217 flush_write_buffers();
220 /* Return whether the given PCI device DMA address mask can
221 * be supported properly. For example, if your device can
222 * only drive the low 24-bits during PCI bus mastering, then
223 * you would pass 0x00ffffff as the mask to this function.
225 static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
228 * we fall back to GFP_DMA when the mask isn't all 1s,
229 * so we can't guarantee allocations that must be
230 * within a tighter range than GFP_DMA..
232 if(mask < 0x00ffffff)
238 /* This is always fine. */
239 #define pci_dac_dma_supported(pci_dev, mask) (1)
241 static __inline__ dma64_addr_t
242 pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
244 return ((dma64_addr_t) page_to_bus(page) +
245 (dma64_addr_t) offset);
248 static __inline__ struct page *
249 pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
251 unsigned long poff = (dma_addr >> PAGE_SHIFT);
253 return mem_map + poff;
256 static __inline__ unsigned long
257 pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
259 return (dma_addr & ~PAGE_MASK);
262 static __inline__ void
263 pci_dac_dma_sync_single(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
265 flush_write_buffers();
268 /* These macros should be used after a pci_map_sg call has been done
269 * to get bus addresses of each of the SG entries and their lengths.
270 * You should only work with the number of sg entries pci_map_sg
273 #define sg_dma_address(sg) ((sg)->dma_address)
274 #define sg_dma_len(sg) ((sg)->length)
276 /* Return the index of the PCI controller for device. */
277 static inline int pci_controller_num(struct pci_dev *dev)
282 #define HAVE_PCI_MMAP
283 extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
284 enum pci_mmap_state mmap_state, int write_combine);
286 #endif /* __KERNEL__ */
288 #endif /* __i386_PCI_H */