arch/sparc/include/asm/pci_32.h

   1 #ifndef __SPARC_PCI_H
   2 #define __SPARC_PCI_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/dma-mapping.h>
   7
   8 /* Can be used to override the logic in pci_scan_bus for skipping
   9  * already-configured bus numbers - to be used for buggy BIOSes
  10  * or architectures with incomplete PCI setup by the loader.
  11  */
  12 #define pcibios_assign_all_busses()     0
  13 #define pcibios_scan_all_fns(a, b)      0
  14
  15 #define PCIBIOS_MIN_IO          0UL
  16 #define PCIBIOS_MIN_MEM         0UL
  17
  18 #define PCI_IRQ_NONE            0xffffffff
  19
  20 static inline void pcibios_set_master(struct pci_dev *dev)
  21 {
  22         /* No special bus mastering setup handling */
  23 }
  24
  25 static inline void pcibios_penalize_isa_irq(int irq, int active)
  26 {
  27         /* We don't do dynamic PCI IRQ allocation */
  28 }
  29
  30 /* Dynamic DMA mapping stuff.
  31  */
  32 #define PCI_DMA_BUS_IS_PHYS     (0)
  33
  34 #include <asm/scatterlist.h>
  35
  36 struct pci_dev;
  37
  38 /* Allocate and map kernel buffer using consistent mode DMA for a device.
  39  * hwdev should be valid struct pci_dev pointer for PCI devices.
  40  */
  41 extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle);
  42
  43 /* Free and unmap a consistent DMA buffer.
  44  * cpu_addr is what was returned from pci_alloc_consistent,
  45  * size must be the same as what as passed into pci_alloc_consistent,
  46  * and likewise dma_addr must be the same as what *dma_addrp was set to.
  47  *
  48  * References to the memory and mappings assosciated with cpu_addr/dma_addr
  49  * past this call are illegal.
  50  */
  51 extern void pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle);
  52
  53 /* Map a single buffer of the indicated size for DMA in streaming mode.
  54  * The 32-bit bus address to use is returned.
  55  *
  56  * Once the device is given the dma address, the device owns this memory
  57  * until either pci_unmap_single or pci_dma_sync_single_for_cpu is performed.
  58  */
  59 extern dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction);
  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 guaranteed to see
  66  * whatever the device wrote there.
  67  */
  68 extern void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction);
  69
  70 /* pci_unmap_{single,page} is not a nop, thus... */
  71 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)       \
  72         dma_addr_t ADDR_NAME;
  73 #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)         \
  74         __u32 LEN_NAME;
  75 #define pci_unmap_addr(PTR, ADDR_NAME)                  \
  76         ((PTR)->ADDR_NAME)
  77 #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)         \
  78         (((PTR)->ADDR_NAME) = (VAL))
  79 #define pci_unmap_len(PTR, LEN_NAME)                    \
  80         ((PTR)->LEN_NAME)
  81 #define pci_unmap_len_set(PTR, LEN_NAME, VAL)           \
  82         (((PTR)->LEN_NAME) = (VAL))
  83
  84 /*
  85  * Same as above, only with pages instead of mapped addresses.
  86  */
  87 extern dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
  88                         unsigned long offset, size_t size, int direction);
  89 extern void pci_unmap_page(struct pci_dev *hwdev,
  90                         dma_addr_t dma_address, size_t size, int direction);
  91
  92 /* Map a set of buffers described by scatterlist in streaming
  93  * mode for DMA.  This is the scather-gather version of the
  94  * above pci_map_single interface.  Here the scatter gather list
  95  * elements are each tagged with the appropriate dma address
  96  * and length.  They are obtained via sg_dma_{address,length}(SG).
  97  *
  98  * NOTE: An implementation may be able to use a smaller number of
  99  *       DMA address/length pairs than there are SG table elements.
 100  *       (for example via virtual mapping capabilities)
 101  *       The routine returns the number of addr/length pairs actually
 102  *       used, at most nents.
 103  *
 104  * Device ownership issues as mentioned above for pci_map_single are
 105  * the same here.
 106  */
 107 extern int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction);
 108
 109 /* Unmap a set of streaming mode DMA translations.
 110  * Again, cpu read rules concerning calls here are the same as for
 111  * pci_unmap_single() above.
 112  */
 113 extern void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nhwents, int direction);
 114
 115 /* Make physical memory consistent for a single
 116  * streaming mode DMA translation after a transfer.
 117  *
 118  * If you perform a pci_map_single() but wish to interrogate the
 119  * buffer using the cpu, yet do not wish to teardown the PCI dma
 120  * mapping, you must call this function before doing so.  At the
 121  * next point you give the PCI dma address back to the card, you
 122  * must first perform a pci_dma_sync_for_device, and then the device
 123  * again owns the buffer.
 124  */
 125 extern void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction);
 126 extern void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction);
 127
 128 /* Make physical memory consistent for a set of streaming
 129  * mode DMA translations after a transfer.
 130  *
 131  * The same as pci_dma_sync_single_* but for a scatter-gather list,
 132  * same rules and usage.
 133  */
 134 extern void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction);
 135 extern void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction);
 136
 137 /* Return whether the given PCI device DMA address mask can
 138  * be supported properly.  For example, if your device can
 139  * only drive the low 24-bits during PCI bus mastering, then
 140  * you would pass 0x00ffffff as the mask to this function.
 141  */
 142 static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
 143 {
 144         return 1;
 145 }
 146
 147 #ifdef CONFIG_PCI
 148 static inline void pci_dma_burst_advice(struct pci_dev *pdev,
 149                                         enum pci_dma_burst_strategy *strat,
 150                                         unsigned long *strategy_parameter)
 151 {
 152         *strat = PCI_DMA_BURST_INFINITY;
 153         *strategy_parameter = ~0UL;
 154 }
 155 #endif
 156
 157 #define PCI_DMA_ERROR_CODE      (~(dma_addr_t)0x0)
 158
 159 static inline int pci_dma_mapping_error(struct pci_dev *pdev,
 160                                         dma_addr_t dma_addr)
 161 {
 162         return (dma_addr == PCI_DMA_ERROR_CODE);
 163 }
 164
 165 struct device_node;
 166 extern struct device_node *pci_device_to_OF_node(struct pci_dev *pdev);
 167
 168 #endif /* __KERNEL__ */
 169
 170 /* generic pci stuff */
 171 #include <asm-generic/pci.h>
 172
 173 #endif /* __SPARC_PCI_H */