pci.h
上传用户:lgb322
上传日期:2013-02-24
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文件大小:7k
- #ifndef ASMARM_PCI_H
- #define ASMARM_PCI_H
- #ifdef __KERNEL__
- #include <asm/arch/hardware.h>
- static inline void pcibios_set_master(struct pci_dev *dev)
- {
- /* No special bus mastering setup handling */
- }
- static inline void pcibios_penalize_isa_irq(int irq)
- {
- /* We don't do dynamic PCI IRQ allocation */
- }
- #include <asm/scatterlist.h>
- #include <asm/io.h>
- struct pci_dev;
- /* 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 *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.
- */
- static inline void
- pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr,
- dma_addr_t dma_handle)
- {
- consistent_free(vaddr, size, 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 defined(CONFIG_SA1111)
- extern dma_addr_t sa1111_map_single(struct pci_dev *, void *, size_t, int);
- /*
- * for SA1111 these functions are "magic" and relocate buffers. We
- * only need to do these if hwdev is non-null; otherwise we expect
- * the buffer to already be suitable for DMA.
- */
- if (hwdev != NULL)
- return sa1111_map_single(hwdev, ptr, size, direction);
- #elif defined(CONFIG_ARCH_S3C2410)
- extern dma_addr_t s3c2410_map_single(struct pci_dev *, void *, size_t, int);
- if (hwdev != NULL)
- return s3c2410_map_single(hwdev, ptr, size, direction);
- #endif
- consistent_sync(ptr, size, direction);
- 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 defined(CONFIG_SA1111)
- extern void sa1111_unmap_single(struct pci_dev *, dma_addr_t, size_t, int);
- if (hwdev != NULL)
- sa1111_unmap_single(hwdev, dma_addr, size, direction);
- #elif defined(CONFIG_ARCH_S3C2410)
- extern void s3c2410_unmap_single(struct pci_dev *, dma_addr_t, size_t, int);
- if (hwdev != NULL)
- s3c2410_unmap_single(hwdev, dma_addr, size, direction);
- #endif
- /* nothing to do */
- }
- /* Whether pci_unmap_{single,page} is a nop depends upon the
- * configuration.
- */
- #if defined(CONFIG_SA1111) || defined(CONFIG_ARCH_S3C2410)
- #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
- dma_addr_t ADDR_NAME;
- #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
- __u32 LEN_NAME;
- #define pci_unmap_addr(PTR, ADDR_NAME)
- ((PTR)->ADDR_NAME)
- #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)
- (((PTR)->ADDR_NAME) = (VAL))
- #define pci_unmap_len(PTR, LEN_NAME)
- ((PTR)->LEN_NAME)
- #define pci_unmap_len_set(PTR, LEN_NAME, VAL)
- (((PTR)->LEN_NAME) = (VAL))
- #else /* !(CONFIG_SA1111 || CONFIG_ARCH_S3C2410) */
- #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)
- #endif /* CONFIG_SA1111 */
- /* 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;
- for (i = 0; i < nents; i++, sg++) {
- consistent_sync(sg->address, sg->length, direction);
- sg->dma_address = virt_to_bus(sg->address);
- }
- 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)
- {
- /* 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)
- {
- consistent_sync(bus_to_virt(dma_handle), size, direction);
- }
- /* 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)
- {
- int i;
- for (i = 0; i < nelems; i++, sg++)
- consistent_sync(sg->address, sg->length, direction);
- }
- /* 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)
- {
- return 1;
- }
- /* This isn't fine. */
- #define pci_dac_dma_supported(pci_dev, mask) (0)
- /* Return the index of the PCI controller for device PDEV. */
- #define pci_controller_num(PDEV) (0)
- #endif /* __KERNEL__ */
-
- #endif