pci.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:7k
- #ifndef __ASM_SH_PCI_H
- #define __ASM_SH_PCI_H
- #ifdef __KERNEL__
- #include <linux/config.h>
- /* 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 */
- #define pcibios_assign_all_busses() 1
- #if defined(CONFIG_CPU_SUBTYPE_ST40STB1)
- /* These are currently the correct values for the STM overdrive board.
- * We need some way of setting this on a board specific way, it will
- * not be the same on other boards I think
- */
- #define PCIBIOS_MIN_IO 0x2000
- #define PCIBIOS_MIN_MEM 0x10000000
- #elif defined(CONFIG_SH_DREAMCAST)
- #define PCIBIOS_MIN_IO 0x2000
- #define PCIBIOS_MIN_MEM 0x10000000
- #elif defined(CONFIG_SH_BIGSUR) && defined(CONFIG_CPU_SUBTYPE_SH7751)
- #define PCIBIOS_MIN_IO 0x2000
- #define PCIBIOS_MIN_MEM 0xFD000000
- #elif defined(CONFIG_SH_7751_SOLUTION_ENGINE)
- #define PCIBIOS_MIN_IO 0x4000
- #define PCIBIOS_MIN_MEM 0xFD000000
- #endif
- struct pci_dev;
- extern void pcibios_set_master(struct pci_dev *dev);
- static inline void pcibios_penalize_isa_irq(int irq)
- {
- /* We don't do dynamic PCI IRQ allocation */
- }
- /* Dynamic DMA mapping stuff.
- * SuperH has everything mapped statically like x86.
- */
- #include <linux/types.h>
- #include <linux/slab.h>
- #include <asm/scatterlist.h>
- #include <linux/string.h>
- #include <asm/io.h>
- /* 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)
- BUG();
- #ifdef CONFIG_SH_PCIDMA_NONCOHERENT
- dma_cache_wback_inv(ptr, size);
- #endif
- return virt_to_bus(ptr);
- }
- /* pci_unmap_{single,page} being a nop depends upon the
- * configuration.
- */
- #ifdef CONFIG_SH_PCIDMA_NONCOHERENT
- #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
- #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
- /* 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)
- {
- /* Nothing to do */
- }
- /* 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)
- {
- #ifdef CONFIG_SH_PCIDMA_NONCOHERENT
- int i;
- for (i=0; i<nents; i++)
- dma_cache_wback_inv(sg[i].address, sg[i].length);
- #endif
- if (direction == PCI_DMA_NONE)
- BUG();
- 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)
- {
- if (direction == PCI_DMA_NONE)
- BUG();
- #ifdef CONFIG_SH_PCIDMA_NONCOHERENT
- dma_cache_wback_inv(bus_to_virt(dma_handle), size);
- #endif
-
- }
- /* 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)
- BUG();
- #ifdef CONFIG_SH_PCIDMA_NONCOHERENT
- int i;
- for (i=0; i<nelems; i++)
- dma_cache_wback_inv(sg[i].address, sg[i].length);
- #endif
- }
- /* 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;
- }
- /* Not supporting more than 32-bit PCI bus addresses now, but
- * must satisfy references to this function. Change if needed.
- */
- #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)
- /* 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, or alternatively stop on the first sg_dma_len(sg) which
- * is 0.
- */
- #define sg_dma_address(sg) (virt_to_bus((sg)->address))
- #define sg_dma_len(sg) ((sg)->length)
- #endif /* __KERNEL__ */
- #endif /* __ASM_SH_PCI_H */