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 #define pcibios_scan_all_fns(a, b)      0
  12
  13 #define PCIBIOS_MIN_IO          0UL
  14 #define PCIBIOS_MIN_MEM         0UL
  15
  16 #define PCI_IRQ_NONE            0xffffffff
  17
  18 static inline void pcibios_set_master(struct pci_dev *dev)
  19 {
  20         /* No special bus mastering setup handling */
  21 }
  22
  23 static inline void pcibios_penalize_isa_irq(int irq, int active)
  24 {
  25         /* We don't do dynamic PCI IRQ allocation */
  26 }
  27
  28 /* Dynamic DMA mapping stuff.
  29  */
  30 #define PCI_DMA_BUS_IS_PHYS     (0)
  31
  32 #include <asm/scatterlist.h>
  33
  34 struct pci_dev;
  35
  36 /* Allocate and map kernel buffer using consistent mode DMA for a device.
  37  * hwdev should be valid struct pci_dev pointer for PCI devices.
  38  */
  39 extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle);
  40
  41 /* Free and unmap a consistent DMA buffer.
  42  * cpu_addr is what was returned from pci_alloc_consistent,
  43  * size must be the same as what as passed into pci_alloc_consistent,
  44  * and likewise dma_addr must be the same as what *dma_addrp was set to.
  45  *
  46  * References to the memory and mappings assosciated with cpu_addr/dma_addr
  47  * past this call are illegal.
  48  */
  49 extern void pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle);
  50
  51 /* Map a single buffer of the indicated size for DMA in streaming mode.
  52  * The 32-bit bus address to use is returned.
  53  *
  54  * Once the device is given the dma address, the device owns this memory
  55  * until either pci_unmap_single or pci_dma_sync_single_for_cpu is performed.
  56  */
  57 extern dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction);
  58
  59 /* Unmap a single streaming mode DMA translation.  The dma_addr and size
  60  * must match what was provided for in a previous pci_map_single call.  All
  61  * other usages are undefined.
  62  *
  63  * After this call, reads by the cpu to the buffer are guaranteed to see
  64  * whatever the device wrote there.
  65  */
  66 extern void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction);
  67
  68 /* pci_unmap_{single,page} is not a nop, thus... */
  69 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)       \
  70         dma_addr_t ADDR_NAME;
  71 #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)         \
  72         __u32 LEN_NAME;
  73 #define pci_unmap_addr(PTR, ADDR_NAME)                  \
  74         ((PTR)->ADDR_NAME)
  75 #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)         \
  76         (((PTR)->ADDR_NAME) = (VAL))
  77 #define pci_unmap_len(PTR, LEN_NAME)                    \
  78         ((PTR)->LEN_NAME)
  79 #define pci_unmap_len_set(PTR, LEN_NAME, VAL)           \
  80         (((PTR)->LEN_NAME) = (VAL))
  81
  82 /*
  83  * Same as above, only with pages instead of mapped addresses.
  84  */
  85 extern dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
  86                         unsigned long offset, size_t size, int direction);
  87 extern void pci_unmap_page(struct pci_dev *hwdev,
  88                         dma_addr_t dma_address, size_t size, int direction);
  89
  90 /* Map a set of buffers described by scatterlist in streaming
  91  * mode for DMA.  This is the scather-gather version of the
  92  * above pci_map_single interface.  Here the scatter gather list
  93  * elements are each tagged with the appropriate dma address
  94  * and length.  They are obtained via sg_dma_{address,length}(SG).
  95  *
  96  * NOTE: An implementation may be able to use a smaller number of
  97  *       DMA address/length pairs than there are SG table elements.
  98  *       (for example via virtual mapping capabilities)
  99  *       The routine returns the number of addr/length pairs actually
 100  *       used, at most nents.
 101  *
 102  * Device ownership issues as mentioned above for pci_map_single are
 103  * the same here.
 104  */
 105 extern int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction);
 106
 107 /* Unmap a set of streaming mode DMA translations.
 108  * Again, cpu read rules concerning calls here are the same as for
 109  * pci_unmap_single() above.
 110  */
 111 extern void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nhwents, int direction);
 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, you
 120  * must first perform a pci_dma_sync_for_device, and then the device
 121  * again owns the buffer.
 122  */
 123 extern void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction);
 124 extern void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction);
 125
 126 /* Make physical memory consistent for a set of streaming
 127  * mode DMA translations after a transfer.
 128  *
 129  * The same as pci_dma_sync_single_* but for a scatter-gather list,
 130  * same rules and usage.
 131  */
 132 extern void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction);
 133 extern void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction);
 134
 135 /* Return whether the given PCI device DMA address mask can
 136  * be supported properly.  For example, if your device can
 137  * only drive the low 24-bits during PCI bus mastering, then
 138  * you would pass 0x00ffffff as the mask to this function.
 139  */
 140 static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
 141 {
 142         return 1;
 143 }
 144
 145 #ifdef CONFIG_PCI
 146 static inline void pci_dma_burst_advice(struct pci_dev *pdev,
 147                                         enum pci_dma_burst_strategy *strat,
 148                                         unsigned long *strategy_parameter)
 149 {
 150         *strat = PCI_DMA_BURST_INFINITY;
 151         *strategy_parameter = ~0UL;
 152 }
 153 #endif
 154
 155 #define PCI_DMA_ERROR_CODE      (~(dma_addr_t)0x0)
 156
 157 static inline int pci_dma_mapping_error(dma_addr_t dma_addr)
 158 {
 159         return (dma_addr == PCI_DMA_ERROR_CODE);
 160 }
 161
 162 struct device_node;
 163 extern struct device_node *pci_device_to_OF_node(struct pci_dev *pdev);
 164
 165 #endif /* __KERNEL__ */
 166
 167 /* generic pci stuff */
 168 #include <asm-generic/pci.h>
 169
 170 #endif /* __SPARC_PCI_H */