include/asm-sparc/pci.h

   1 #ifndef __SPARC_PCI_H
   2 #define __SPARC_PCI_H
   3
   4 #ifdef __KERNEL__
   5
   6 /* Can be used to override the logic in pci_scan_bus for skipping
   7  * already-configured bus numbers - to be used for buggy BIOSes
   8  * or architectures with incomplete PCI setup by the loader.
   9  */
  10 #define pcibios_assign_all_busses()     0
  11
  12 #define PCIBIOS_MIN_IO          0UL
  13 #define PCIBIOS_MIN_MEM         0UL
  14
  15 extern inline void pcibios_set_master(struct pci_dev *dev)
  16 {
  17         /* No special bus mastering setup handling */
  18 }
  19
  20 extern inline void pcibios_penalize_isa_irq(int irq)
  21 {
  22         /* We don't do dynamic PCI IRQ allocation */
  23 }
  24
  25 /* Dynamic DMA mapping stuff.
  26  */
  27
  28 #include <asm/scatterlist.h>
  29
  30 struct pci_dev;
  31
  32 /* Allocate and map kernel buffer using consistent mode DMA for a device.
  33  * hwdev should be valid struct pci_dev pointer for PCI devices.
  34  */
  35 extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle);
  36
  37 /* Free and unmap a consistent DMA buffer.
  38  * cpu_addr is what was returned from pci_alloc_consistent,
  39  * size must be the same as what as passed into pci_alloc_consistent,
  40  * and likewise dma_addr must be the same as what *dma_addrp was set to.
  41  *
  42  * References to the memory and mappings assosciated with cpu_addr/dma_addr
  43  * past this call are illegal.
  44  */
  45 extern void pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle);
  46
  47 /* Map a single buffer of the indicated size for DMA in streaming mode.
  48  * The 32-bit bus address to use is returned.
  49  *
  50  * Once the device is given the dma address, the device owns this memory
  51  * until either pci_unmap_single or pci_dma_sync_single is performed.
  52  */
  53 extern dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction);
  54
  55 /* Unmap a single streaming mode DMA translation.  The dma_addr and size
  56  * must match what was provided for in a previous pci_map_single call.  All
  57  * other usages are undefined.
  58  *
  59  * After this call, reads by the cpu to the buffer are guarenteed to see
  60  * whatever the device wrote there.
  61  */
  62 extern void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction);
  63
  64 /* Map a set of buffers described by scatterlist in streaming
  65  * mode for DMA.  This is the scather-gather version of the
  66  * above pci_map_single interface.  Here the scatter gather list
  67  * elements are each tagged with the appropriate dma address
  68  * and length.  They are obtained via sg_dma_{address,length}(SG).
  69  *
  70  * NOTE: An implementation may be able to use a smaller number of
  71  *       DMA address/length pairs than there are SG table elements.
  72  *       (for example via virtual mapping capabilities)
  73  *       The routine returns the number of addr/length pairs actually
  74  *       used, at most nents.
  75  *
  76  * Device ownership issues as mentioned above for pci_map_single are
  77  * the same here.
  78  */
  79 extern int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction);
  80
  81 /* Unmap a set of streaming mode DMA translations.
  82  * Again, cpu read rules concerning calls here are the same as for
  83  * pci_unmap_single() above.
  84  */
  85 extern void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nhwents, int direction);
  86
  87 /* Make physical memory consistent for a single
  88  * streaming mode DMA translation after a transfer.
  89  *
  90  * If you perform a pci_map_single() but wish to interrogate the
  91  * buffer using the cpu, yet do not wish to teardown the PCI dma
  92  * mapping, you must call this function before doing so.  At the
  93  * next point you give the PCI dma address back to the card, the
  94  * device again owns the buffer.
  95  */
  96 extern void pci_dma_sync_single(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction);
  97
  98 /* Make physical memory consistent for a set of streaming
  99  * mode DMA translations after a transfer.
 100  *
 101  * The same as pci_dma_sync_single but for a scatter-gather list,
 102  * same rules and usage.
 103  */
 104 extern void pci_dma_sync_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction);
 105
 106 /* Return whether the given PCI device DMA address mask can
 107  * be supported properly.  For example, if your device can
 108  * only drive the low 24-bits during PCI bus mastering, then
 109  * you would pass 0x00ffffff as the mask to this function.
 110  */
 111 extern inline int pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask)
 112 {
 113         return 1;
 114 }
 115
 116 #endif /* __KERNEL__ */
 117
 118 #endif /* __SPARC_PCI_H */