pci.h
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上传日期:2013-04-10
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文件大小:8k
- #ifndef __i386_PCI_H
- #define __i386_PCI_H
- #include <linux/config.h>
- #ifdef __KERNEL__
- /* Can be used to override the logic in pci_scan_bus for skipping
- already-configured bus numbers - to be used for buggy BIOSes
- or architectures with incomplete PCI setup by the loader */
- #ifdef CONFIG_PCI
- extern unsigned int pcibios_assign_all_busses(void);
- #else
- #define pcibios_assign_all_busses() 0
- #endif
- extern unsigned long pci_mem_start;
- #define PCIBIOS_MIN_IO 0x1000
- #define PCIBIOS_MIN_MEM (pci_mem_start)
- void pcibios_set_master(struct pci_dev *dev);
- void pcibios_penalize_isa_irq(int irq);
- struct irq_routing_table *pcibios_get_irq_routing_table(void);
- int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);
- /* Dynamic DMA mapping stuff.
- * i386 has everything mapped statically.
- */
- #include <linux/types.h>
- #include <linux/slab.h>
- #include <asm/scatterlist.h>
- #include <linux/string.h>
- #include <asm/io.h>
- struct pci_dev;
- /* The PCI address space does equal the physical memory
- * address space. The networking and block device layers use
- * this boolean for bounce buffer decisions.
- */
- #define PCI_DMA_BUS_IS_PHYS (1)
- /* Allocate and map kernel buffer using consistent mode DMA for a device.
- * hwdev should be valid struct pci_dev pointer for PCI devices,
- * NULL for PCI-like buses (ISA, EISA).
- * Returns non-NULL cpu-view pointer to the buffer if successful and
- * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
- * is undefined.
- */
- extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
- dma_addr_t *dma_handle);
- /* Free and unmap a consistent DMA buffer.
- * cpu_addr is what was returned from pci_alloc_consistent,
- * size must be the same as what as passed into pci_alloc_consistent,
- * and likewise dma_addr must be the same as what *dma_addrp was set to.
- *
- * References to the memory and mappings associated with cpu_addr/dma_addr
- * past this call are illegal.
- */
- extern void pci_free_consistent(struct pci_dev *hwdev, size_t size,
- void *vaddr, dma_addr_t dma_handle);
- /* Map a single buffer of the indicated size for DMA in streaming mode.
- * The 32-bit bus address to use is returned.
- *
- * Once the device is given the dma address, the device owns this memory
- * until either pci_unmap_single or pci_dma_sync_single is performed.
- */
- static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
- size_t size, int direction)
- {
- if (direction == PCI_DMA_NONE)
- out_of_line_bug();
- flush_write_buffers();
- return virt_to_bus(ptr);
- }
- /* Unmap a single streaming mode DMA translation. The dma_addr and size
- * must match what was provided for in a previous pci_map_single call. All
- * other usages are undefined.
- *
- * After this call, reads by the cpu to the buffer are guarenteed to see
- * whatever the device wrote there.
- */
- static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
- size_t size, int direction)
- {
- if (direction == PCI_DMA_NONE)
- out_of_line_bug();
- /* Nothing to do */
- }
- /*
- * pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical
- * to pci_map_single, but takes a struct page instead of a virtual address
- */
- static inline dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
- unsigned long offset, size_t size, int direction)
- {
- if (direction == PCI_DMA_NONE)
- out_of_line_bug();
- return (dma_addr_t)(page - mem_map) * PAGE_SIZE + offset;
- }
- static inline void pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
- size_t size, int direction)
- {
- if (direction == PCI_DMA_NONE)
- out_of_line_bug();
- /* Nothing to do */
- }
- /* pci_unmap_{page,single} is a nop so... */
- #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
- #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
- #define pci_unmap_addr(PTR, ADDR_NAME) (0)
- #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
- #define pci_unmap_len(PTR, LEN_NAME) (0)
- #define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
- /* Map a set of buffers described by scatterlist in streaming
- * mode for DMA. This is the scather-gather version of the
- * above pci_map_single interface. Here the scatter gather list
- * elements are each tagged with the appropriate dma address
- * and length. They are obtained via sg_dma_{address,length}(SG).
- *
- * NOTE: An implementation may be able to use a smaller number of
- * DMA address/length pairs than there are SG table elements.
- * (for example via virtual mapping capabilities)
- * The routine returns the number of addr/length pairs actually
- * used, at most nents.
- *
- * Device ownership issues as mentioned above for pci_map_single are
- * the same here.
- */
- static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
- int nents, int direction)
- {
- int i;
- if (direction == PCI_DMA_NONE)
- out_of_line_bug();
-
- /*
- * temporary 2.4 hack
- */
- for (i = 0; i < nents; i++ ) {
- if (sg[i].address && sg[i].page)
- out_of_line_bug();
- else if (!sg[i].address && !sg[i].page)
- out_of_line_bug();
-
- if (sg[i].address)
- sg[i].dma_address = virt_to_bus(sg[i].address);
- else
- sg[i].dma_address = page_to_bus(sg[i].page) + sg[i].offset;
- }
-
- flush_write_buffers();
- return nents;
- }
- /* Unmap a set of streaming mode DMA translations.
- * Again, cpu read rules concerning calls here are the same as for
- * pci_unmap_single() above.
- */
- static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
- int nents, int direction)
- {
- if (direction == PCI_DMA_NONE)
- out_of_line_bug();
- /* Nothing to do */
- }
- /* Make physical memory consistent for a single
- * streaming mode DMA translation after a transfer.
- *
- * If you perform a pci_map_single() but wish to interrogate the
- * buffer using the cpu, yet do not wish to teardown the PCI dma
- * mapping, you must call this function before doing so. At the
- * next point you give the PCI dma address back to the card, the
- * device again owns the buffer.
- */
- static inline void pci_dma_sync_single(struct pci_dev *hwdev,
- dma_addr_t dma_handle,
- size_t size, int direction)
- {
- if (direction == PCI_DMA_NONE)
- out_of_line_bug();
- flush_write_buffers();
- }
- /* Make physical memory consistent for a set of streaming
- * mode DMA translations after a transfer.
- *
- * The same as pci_dma_sync_single but for a scatter-gather list,
- * same rules and usage.
- */
- static inline void pci_dma_sync_sg(struct pci_dev *hwdev,
- struct scatterlist *sg,
- int nelems, int direction)
- {
- if (direction == PCI_DMA_NONE)
- out_of_line_bug();
- flush_write_buffers();
- }
- /* Return whether the given PCI device DMA address mask can
- * be supported properly. For example, if your device can
- * only drive the low 24-bits during PCI bus mastering, then
- * you would pass 0x00ffffff as the mask to this function.
- */
- static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
- {
- /*
- * we fall back to GFP_DMA when the mask isn't all 1s,
- * so we can't guarantee allocations that must be
- * within a tighter range than GFP_DMA..
- */
- if(mask < 0x00ffffff)
- return 0;
- return 1;
- }
- /* This is always fine. */
- #define pci_dac_dma_supported(pci_dev, mask) (1)
- static __inline__ dma64_addr_t
- pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
- {
- return ((dma64_addr_t) page_to_bus(page) +
- (dma64_addr_t) offset);
- }
- static __inline__ struct page *
- pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
- {
- unsigned long poff = (dma_addr >> PAGE_SHIFT);
- return mem_map + poff;
- }
- static __inline__ unsigned long
- pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
- {
- return (dma_addr & ~PAGE_MASK);
- }
- static __inline__ void
- pci_dac_dma_sync_single(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
- {
- flush_write_buffers();
- }
- /* These macros should be used after a pci_map_sg call has been done
- * to get bus addresses of each of the SG entries and their lengths.
- * You should only work with the number of sg entries pci_map_sg
- * returns.
- */
- #define sg_dma_address(sg) ((sg)->dma_address)
- #define sg_dma_len(sg) ((sg)->length)
- /* Return the index of the PCI controller for device. */
- static inline int pci_controller_num(struct pci_dev *dev)
- {
- return 0;
- }
- #define HAVE_PCI_MMAP
- extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
- enum pci_mmap_state mmap_state, int write_combine);
- #endif /* __KERNEL__ */
- #endif /* __i386_PCI_H */