arch/blackfin/include/asm/pci.h

   1 /* Changed from asm-m68k version, Lineo Inc.    May 2001        */
   2
   3 #ifndef _ASM_BFIN_PCI_H
   4 #define _ASM_BFIN_PCI_H
   5
   6 #include <asm/scatterlist.h>
   7
   8 /*
   9  *
  10  * Written by Wout Klaren.
  11  */
  12
  13 /* Added by Chang Junxiao */
  14 #define PCIBIOS_MIN_IO 0x00001000
  15 #define PCIBIOS_MIN_MEM 0x10000000
  16
  17 #define PCI_DMA_BUS_IS_PHYS       (1)
  18 struct pci_ops;
  19
  20 /*
  21  * Structure with hardware dependent information and functions of the
  22  * PCI bus.
  23  */
  24 struct pci_bus_info {
  25
  26         /*
  27          * Resources of the PCI bus.
  28          */
  29         struct resource mem_space;
  30         struct resource io_space;
  31
  32         /*
  33          * System dependent functions.
  34          */
  35         struct pci_ops *bfin_pci_ops;
  36         void (*fixup) (int pci_modify);
  37         void (*conf_device) (unsigned char bus, unsigned char device_fn);
  38 };
  39
  40 #define pcibios_assign_all_busses()     0
  41 static inline void pcibios_set_master(struct pci_dev *dev)
  42 {
  43
  44         /* No special bus mastering setup handling */
  45 }
  46 static inline void pcibios_penalize_isa_irq(int irq)
  47 {
  48
  49         /* We don't do dynamic PCI IRQ allocation */
  50 }
  51 static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
  52                                         size_t size, int direction)
  53 {
  54         if (direction == PCI_DMA_NONE)
  55                 BUG();
  56
  57          /* return virt_to_bus(ptr); */
  58         return (dma_addr_t) ptr;
  59 }
  60
  61 /* Unmap a single streaming mode DMA translation.  The dma_addr and size
  62  * must match what was provided for in a previous pci_map_single call.  All
  63  * other usages are undefined.
  64  *
  65  * After this call, reads by the cpu to the buffer are guarenteed to see
  66  * whatever the device wrote there.
  67  */
  68 static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
  69                                     size_t size, int direction)
  70 {
  71         if (direction == PCI_DMA_NONE)
  72                 BUG();
  73
  74         /* Nothing to do */
  75 }
  76
  77 /* Map a set of buffers described by scatterlist in streaming
  78  * mode for DMA.  This is the scather-gather version of the
  79  * above pci_map_single interface.  Here the scatter gather list
  80  * elements are each tagged with the appropriate dma address
  81  * and length.  They are obtained via sg_dma_{address,length}(SG).
  82  *
  83  * NOTE: An implementation may be able to use a smaller number of
  84  *       DMA address/length pairs than there are SG table elements.
  85  *       (for example via virtual mapping capabilities)
  86  *       The routine returns the number of addr/length pairs actually
  87  *       used, at most nents.
  88  *
  89  * Device ownership issues as mentioned above for pci_map_single are
  90  * the same here.
  91  */
  92 static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
  93                              int nents, int direction)
  94 {
  95         if (direction == PCI_DMA_NONE)
  96                 BUG();
  97         return nents;
  98 }
  99
 100 /* Unmap a set of streaming mode DMA translations.
 101  * Again, cpu read rules concerning calls here are the same as for
 102  * pci_unmap_single() above.
 103  */
 104 static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
 105                                 int nents, int direction)
 106 {
 107         if (direction == PCI_DMA_NONE)
 108                 BUG();
 109
 110         /* Nothing to do */
 111 }
 112
 113 /* Make physical memory consistent for a single
 114  * streaming mode DMA translation after a transfer.
 115  *
 116  * If you perform a pci_map_single() but wish to interrogate the
 117  * buffer using the cpu, yet do not wish to teardown the PCI dma
 118  * mapping, you must call this function before doing so.  At the
 119  * next point you give the PCI dma address back to the card, the
 120  * device again owns the buffer.
 121  */
 122 static inline void pci_dma_sync_single(struct pci_dev *hwdev,
 123                                        dma_addr_t dma_handle, size_t size,
 124                                        int direction)
 125 {
 126         if (direction == PCI_DMA_NONE)
 127                 BUG();
 128
 129         /* Nothing to do */
 130 }
 131
 132 /* Make physical memory consistent for a set of streaming
 133  * mode DMA translations after a transfer.
 134  *
 135  * The same as pci_dma_sync_single but for a scatter-gather list,
 136  * same rules and usage.
 137  */
 138 static inline void pci_dma_sync_sg(struct pci_dev *hwdev,
 139                                    struct scatterlist *sg, int nelems,
 140                                    int direction)
 141 {
 142         if (direction == PCI_DMA_NONE)
 143                 BUG();
 144
 145         /* Nothing to do */
 146 }
 147
 148 #endif                          /* _ASM_BFIN_PCI_H */