include/asm-arm/pci.h

   1 #ifndef ASMARM_PCI_H
   2 #define ASMARM_PCI_H
   3
   4 #ifdef __KERNEL__
   5
   6 #define pcibios_assign_all_busses()     0
   7
   8 #define PCIBIOS_MIN_IO          0x8000
   9 #define PCIBIOS_MIN_MEM         0x40000000
  10
  11 extern inline void pcibios_set_master(struct pci_dev *dev)
  12 {
  13         /* No special bus mastering setup handling */
  14 }
  15
  16 extern inline void pcibios_penalize_isa_irq(int irq)
  17 {
  18         /* We don't do dynamic PCI IRQ allocation */
  19 }
  20
  21 #include <asm/scatterlist.h>
  22 #include <asm/io.h>
  23
  24 struct pci_dev;
  25
  26 /* Allocate and map kernel buffer using consistent mode DMA for a device.
  27  * hwdev should be valid struct pci_dev pointer for PCI devices,
  28  * NULL for PCI-like buses (ISA, EISA).
  29  * Returns non-NULL cpu-view pointer to the buffer if successful and
  30  * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
  31  * is undefined.
  32  */
  33 extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *handle);
  34
  35 /* Free and unmap a consistent DMA buffer.
  36  * cpu_addr is what was returned from pci_alloc_consistent,
  37  * size must be the same as what as passed into pci_alloc_consistent,
  38  * and likewise dma_addr must be the same as what *dma_addrp was set to.
  39  *
  40  * References to the memory and mappings associated with cpu_addr/dma_addr
  41  * past this call are illegal.
  42  */
  43 extern inline void
  44 pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr,
  45                     dma_addr_t dma_handle)
  46 {
  47         consistent_free(vaddr);
  48 }
  49
  50 /* Map a single buffer of the indicated size for DMA in streaming mode.
  51  * The 32-bit bus address to use is returned.
  52  *
  53  * Once the device is given the dma address, the device owns this memory
  54  * until either pci_unmap_single or pci_dma_sync_single is performed.
  55  */
  56 extern inline dma_addr_t
  57 pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction)
  58 {
  59         consistent_sync(ptr, size, direction);
  60         return virt_to_bus(ptr);
  61 }
  62
  63 /* Unmap a single streaming mode DMA translation.  The dma_addr and size
  64  * must match what was provided for in a previous pci_map_single call.  All
  65  * other usages are undefined.
  66  *
  67  * After this call, reads by the cpu to the buffer are guarenteed to see
  68  * whatever the device wrote there.
  69  */
  70 extern inline void
  71 pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction)
  72 {
  73         /* nothing to do */
  74 }
  75
  76 /* Map a set of buffers described by scatterlist in streaming
  77  * mode for DMA.  This is the scather-gather version of the
  78  * above pci_map_single interface.  Here the scatter gather list
  79  * elements are each tagged with the appropriate dma address
  80  * and length.  They are obtained via sg_dma_{address,length}(SG).
  81  *
  82  * NOTE: An implementation may be able to use a smaller number of
  83  *       DMA address/length pairs than there are SG table elements.
  84  *       (for example via virtual mapping capabilities)
  85  *       The routine returns the number of addr/length pairs actually
  86  *       used, at most nents.
  87  *
  88  * Device ownership issues as mentioned above for pci_map_single are
  89  * the same here.
  90  */
  91 extern inline int
  92 pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
  93 {
  94         int i;
  95
  96         for (i = 0; i < nents; i++, sg++)
  97                 consistent_sync(sg->address, sg->length, direction);
  98
  99         return nents;
 100 }
 101
 102 /* Unmap a set of streaming mode DMA translations.
 103  * Again, cpu read rules concerning calls here are the same as for
 104  * pci_unmap_single() above.
 105  */
 106 extern inline void
 107 pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
 108 {
 109         /* nothing to do */
 110 }
 111
 112 /* Make physical memory consistent for a single
 113  * streaming mode DMA translation after a transfer.
 114  *
 115  * If you perform a pci_map_single() but wish to interrogate the
 116  * buffer using the cpu, yet do not wish to teardown the PCI dma
 117  * mapping, you must call this function before doing so.  At the
 118  * next point you give the PCI dma address back to the card, the
 119  * device again owns the buffer.
 120  */
 121 extern inline void
 122 pci_dma_sync_single(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction)
 123 {
 124         consistent_sync(bus_to_virt(dma_handle), size, direction);
 125 }
 126
 127 /* Make physical memory consistent for a set of streaming
 128  * mode DMA translations after a transfer.
 129  *
 130  * The same as pci_dma_sync_single but for a scatter-gather list,
 131  * same rules and usage.
 132  */
 133 extern inline void
 134 pci_dma_sync_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction)
 135 {
 136         int i;
 137
 138         for (i = 0; i < nelems; i++, sg++)
 139                 consistent_sync(sg->address, sg->length, 3);
 140 }
 141
 142 /* Return whether the given PCI device DMA address mask can
 143  * be supported properly.  For example, if your device can
 144  * only drive the low 24-bits during PCI bus mastering, then
 145  * you would pass 0x00ffffff as the mask to this function.
 146  */
 147 extern inline int pci_dma_supported(struct pci_dev *hwdev, dma_addr_t mask)
 148 {
 149         return 1;
 150 }
 151
 152 /* These macros should be used after a pci_map_sg call has been done
 153  * to get bus addresses of each of the SG entries and their lengths.
 154  * You should only work with the number of sg entries pci_map_sg
 155  * returns, or alternatively stop on the first sg_dma_len(sg) which
 156  * is 0.
 157  */
 158 #define sg_dma_address(sg)      (virt_to_bus((sg)->address))
 159 #define sg_dma_len(sg)          ((sg)->length)
 160
 161 #endif /* __KERNEL__ */
 162
 163 #endif