release/src-rt-6.x/linux/linux-2.6/include/asm-sparc64/pci.h

   1 #ifndef __SPARC64_PCI_H
   2 #define __SPARC64_PCI_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/fs.h>
   7 #include <linux/mm.h>
   8
   9 /* Can be used to override the logic in pci_scan_bus for skipping
  10  * already-configured bus numbers - to be used for buggy BIOSes
  11  * or architectures with incomplete PCI setup by the loader.
  12  */
  13 #define pcibios_assign_all_busses()     0
  14 #define pcibios_scan_all_fns(a, b)      0
  15
  16 #define PCIBIOS_MIN_IO          0UL
  17 #define PCIBIOS_MIN_MEM         0UL
  18
  19 #define PCI_IRQ_NONE            0xffffffff
  20
  21 #define PCI_CACHE_LINE_BYTES    64
  22
  23 static inline void pcibios_set_master(struct pci_dev *dev)
  24 {
  25         /* No special bus mastering setup handling */
  26 }
  27
  28 static inline void pcibios_penalize_isa_irq(int irq, int active)
  29 {
  30         /* We don't do dynamic PCI IRQ allocation */
  31 }
  32
  33 /* Dynamic DMA mapping stuff.
  34  */
  35
  36 /* The PCI address space does not equal the physical memory
  37  * address space.  The networking and block device layers use
  38  * this boolean for bounce buffer decisions.
  39  */
  40 #define PCI_DMA_BUS_IS_PHYS     (0)
  41
  42 #include <asm/scatterlist.h>
  43
  44 struct pci_dev;
  45
  46 struct pci_iommu_ops {
  47         void *(*alloc_consistent)(struct pci_dev *, size_t, dma_addr_t *, gfp_t);
  48         void (*free_consistent)(struct pci_dev *, size_t, void *, dma_addr_t);
  49         dma_addr_t (*map_single)(struct pci_dev *, void *, size_t, int);
  50         void (*unmap_single)(struct pci_dev *, dma_addr_t, size_t, int);
  51         int (*map_sg)(struct pci_dev *, struct scatterlist *, int, int);
  52         void (*unmap_sg)(struct pci_dev *, struct scatterlist *, int, int);
  53         void (*dma_sync_single_for_cpu)(struct pci_dev *, dma_addr_t, size_t, int);
  54         void (*dma_sync_sg_for_cpu)(struct pci_dev *, struct scatterlist *, int, int);
  55 };
  56
  57 extern const struct pci_iommu_ops *pci_iommu_ops;
  58
  59 /* Allocate and map kernel buffer using consistent mode DMA for a device.
  60  * hwdev should be valid struct pci_dev pointer for PCI devices.
  61  */
  62 static inline void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle)
  63 {
  64         return pci_iommu_ops->alloc_consistent(hwdev, size, dma_handle, GFP_ATOMIC);
  65 }
  66
  67 /* Free and unmap a consistent DMA buffer.
  68  * cpu_addr is what was returned from pci_alloc_consistent,
  69  * size must be the same as what as passed into pci_alloc_consistent,
  70  * and likewise dma_addr must be the same as what *dma_addrp was set to.
  71  *
  72  * References to the memory and mappings associated with cpu_addr/dma_addr
  73  * past this call are illegal.
  74  */
  75 static inline void pci_free_consistent(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
  76 {
  77         return pci_iommu_ops->free_consistent(hwdev, size, vaddr, dma_handle);
  78 }
  79
  80 /* Map a single buffer of the indicated size for DMA in streaming mode.
  81  * The 32-bit bus address to use is returned.
  82  *
  83  * Once the device is given the dma address, the device owns this memory
  84  * until either pci_unmap_single or pci_dma_sync_single_for_cpu is performed.
  85  */
  86 static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction)
  87 {
  88         return pci_iommu_ops->map_single(hwdev, ptr, size, direction);
  89 }
  90
  91 /* Unmap a single streaming mode DMA translation.  The dma_addr and size
  92  * must match what was provided for in a previous pci_map_single call.  All
  93  * other usages are undefined.
  94  *
  95  * After this call, reads by the cpu to the buffer are guaranteed to see
  96  * whatever the device wrote there.
  97  */
  98 static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr, size_t size, int direction)
  99 {
 100         pci_iommu_ops->unmap_single(hwdev, dma_addr, size, direction);
 101 }
 102
 103 /* No highmem on sparc64, plus we have an IOMMU, so mapping pages is easy. */
 104 #define pci_map_page(dev, page, off, size, dir) \
 105         pci_map_single(dev, (page_address(page) + (off)), size, dir)
 106 #define pci_unmap_page(dev,addr,sz,dir) pci_unmap_single(dev,addr,sz,dir)
 107
 108 /* pci_unmap_{single,page} is not a nop, thus... */
 109 #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)       \
 110         dma_addr_t ADDR_NAME;
 111 #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)         \
 112         __u32 LEN_NAME;
 113 #define pci_unmap_addr(PTR, ADDR_NAME)                  \
 114         ((PTR)->ADDR_NAME)
 115 #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)         \
 116         (((PTR)->ADDR_NAME) = (VAL))
 117 #define pci_unmap_len(PTR, LEN_NAME)                    \
 118         ((PTR)->LEN_NAME)
 119 #define pci_unmap_len_set(PTR, LEN_NAME, VAL)           \
 120         (((PTR)->LEN_NAME) = (VAL))
 121
 122 /* Map a set of buffers described by scatterlist in streaming
 123  * mode for DMA.  This is the scatter-gather version of the
 124  * above pci_map_single interface.  Here the scatter gather list
 125  * elements are each tagged with the appropriate dma address
 126  * and length.  They are obtained via sg_dma_{address,length}(SG).
 127  *
 128  * NOTE: An implementation may be able to use a smaller number of
 129  *       DMA address/length pairs than there are SG table elements.
 130  *       (for example via virtual mapping capabilities)
 131  *       The routine returns the number of addr/length pairs actually
 132  *       used, at most nents.
 133  *
 134  * Device ownership issues as mentioned above for pci_map_single are
 135  * the same here.
 136  */
 137 static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
 138 {
 139         return pci_iommu_ops->map_sg(hwdev, sg, nents, direction);
 140 }
 141
 142 /* Unmap a set of streaming mode DMA translations.
 143  * Again, cpu read rules concerning calls here are the same as for
 144  * pci_unmap_single() above.
 145  */
 146 static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nhwents, int direction)
 147 {
 148         pci_iommu_ops->unmap_sg(hwdev, sg, nhwents, direction);
 149 }
 150
 151 /* Make physical memory consistent for a single
 152  * streaming mode DMA translation after a transfer.
 153  *
 154  * If you perform a pci_map_single() but wish to interrogate the
 155  * buffer using the cpu, yet do not wish to teardown the PCI dma
 156  * mapping, you must call this function before doing so.  At the
 157  * next point you give the PCI dma address back to the card, you
 158  * must first perform a pci_dma_sync_for_device, and then the
 159  * device again owns the buffer.
 160  */
 161 static inline void pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t dma_handle, size_t size, int direction)
 162 {
 163         pci_iommu_ops->dma_sync_single_for_cpu(hwdev, dma_handle, size, direction);
 164 }
 165
 166 static inline void
 167 pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t dma_handle,
 168                                size_t size, int direction)
 169 {
 170         /* No flushing needed to sync cpu writes to the device.  */
 171         BUG_ON(direction == PCI_DMA_NONE);
 172 }
 173
 174 /* Make physical memory consistent for a set of streaming
 175  * mode DMA translations after a transfer.
 176  *
 177  * The same as pci_dma_sync_single_* but for a scatter-gather list,
 178  * same rules and usage.
 179  */
 180 static inline void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nelems, int direction)
 181 {
 182         pci_iommu_ops->dma_sync_sg_for_cpu(hwdev, sg, nelems, direction);
 183 }
 184
 185 static inline void
 186 pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg,
 187                         int nelems, int direction)
 188 {
 189         /* No flushing needed to sync cpu writes to the device.  */
 190         BUG_ON(direction == PCI_DMA_NONE);
 191 }
 192
 193 /* Return whether the given PCI device DMA address mask can
 194  * be supported properly.  For example, if your device can
 195  * only drive the low 24-bits during PCI bus mastering, then
 196  * you would pass 0x00ffffff as the mask to this function.
 197  */
 198 extern int pci_dma_supported(struct pci_dev *hwdev, u64 mask);
 199
 200 /* PCI IOMMU mapping bypass support. */
 201
 202 /* PCI 64-bit addressing works for all slots on all controller
 203  * types on sparc64.  However, it requires that the device
 204  * can drive enough of the 64 bits.
 205  */
 206 #define PCI64_REQUIRED_MASK     (~(dma64_addr_t)0)
 207 #define PCI64_ADDR_BASE         0xfffc000000000000UL
 208
 209 /* Usage of the pci_dac_foo interfaces is only valid if this
 210  * test passes.
 211  */
 212 #define pci_dac_dma_supported(pci_dev, mask) \
 213         ((((mask) & PCI64_REQUIRED_MASK) == PCI64_REQUIRED_MASK) ? 1 : 0)
 214
 215 static inline dma64_addr_t
 216 pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
 217 {
 218         return (PCI64_ADDR_BASE +
 219                 __pa(page_address(page)) + offset);
 220 }
 221
 222 static inline struct page *
 223 pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
 224 {
 225         unsigned long paddr = (dma_addr & PAGE_MASK) - PCI64_ADDR_BASE;
 226
 227         return virt_to_page(__va(paddr));
 228 }
 229
 230 static inline unsigned long
 231 pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
 232 {
 233         return (dma_addr & ~PAGE_MASK);
 234 }
 235
 236 static inline void
 237 pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
 238 {
 239         /* DAC cycle addressing does not make use of the
 240          * PCI controller's streaming cache, so nothing to do.
 241          */
 242 }
 243
 244 static inline void
 245 pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
 246 {
 247         /* DAC cycle addressing does not make use of the
 248          * PCI controller's streaming cache, so nothing to do.
 249          */
 250 }
 251
 252 #define PCI_DMA_ERROR_CODE      (~(dma_addr_t)0x0)
 253
 254 static inline int pci_dma_mapping_error(dma_addr_t dma_addr)
 255 {
 256         return (dma_addr == PCI_DMA_ERROR_CODE);
 257 }
 258
 259 #ifdef CONFIG_PCI
 260 static inline void pci_dma_burst_advice(struct pci_dev *pdev,
 261                                         enum pci_dma_burst_strategy *strat,
 262                                         unsigned long *strategy_parameter)
 263 {
 264         unsigned long cacheline_size;
 265         u8 byte;
 266
 267         pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);
 268         if (byte == 0)
 269                 cacheline_size = 1024;
 270         else
 271                 cacheline_size = (int) byte * 4;
 272
 273         *strat = PCI_DMA_BURST_BOUNDARY;
 274         *strategy_parameter = cacheline_size;
 275 }
 276 #endif
 277
 278 /* Return the index of the PCI controller for device PDEV. */
 279
 280 extern int pci_domain_nr(struct pci_bus *bus);
 281 static inline int pci_proc_domain(struct pci_bus *bus)
 282 {
 283         return 1;
 284 }
 285
 286 /* Platform support for /proc/bus/pci/X/Y mmap()s. */
 287
 288 #define HAVE_PCI_MMAP
 289 #define HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 290 #define get_pci_unmapped_area get_fb_unmapped_area
 291
 292 extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 293                                enum pci_mmap_state mmap_state,
 294                                int write_combine);
 295
 296 extern void
 297 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 298                         struct resource *res);
 299
 300 extern void
 301 pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
 302                         struct pci_bus_region *region);
 303
 304 extern struct resource *pcibios_select_root(struct pci_dev *, struct resource *);
 305
 306 static inline void pcibios_add_platform_entries(struct pci_dev *dev)
 307 {
 308 }
 309
 310 static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
 311 {
 312         return PCI_IRQ_NONE;
 313 }
 314
 315 struct device_node;
 316 extern struct device_node *pci_device_to_OF_node(struct pci_dev *pdev);
 317
 318 #endif /* __KERNEL__ */
 319
 320 #endif /* __SPARC64_PCI_H */