FreeBSD/Linux Kernel Cross Reference
sys/include/asm-mips64/pci.h

     /*
      * This file is subject to the terms and conditions of the GNU General Public
      * License.  See the file "COPYING" in the main directory of this archive
      * for more details.
      */
     #ifndef _ASM_PCI_H
     #define _ASM_PCI_H
     
     #include <linux/config.h>
    
    #ifdef __KERNEL__
    
    /* Can be used to override the logic in pci_scan_bus for skipping
       already-configured bus numbers - to be used for buggy BIOSes
       or architectures with incomplete PCI setup by the loader */
    
    #ifdef CONFIG_PCI
    extern unsigned int pcibios_assign_all_busses(void);
    #else
    #define pcibios_assign_all_busses()     0
    #endif
    
    #define PCIBIOS_MIN_IO          0x1000
    #define PCIBIOS_MIN_MEM         0x10000000
    
    extern void pcibios_set_master(struct pci_dev *dev);
    
    static inline void pcibios_penalize_isa_irq(int irq)
    {
            /* We don't do dynamic PCI IRQ allocation */
    }
    
    /*
     * Dynamic DMA mapping stuff.
     * MIPS has everything mapped statically.
     */
    
    #include <linux/types.h>
    #include <linux/slab.h>
    #include <asm/scatterlist.h>
    #include <linux/string.h>
    #include <asm/io.h>
    
    #if (defined(CONFIG_DDB5074) || defined(CONFIG_DDB5476))
    #undef PCIBIOS_MIN_IO
    #undef PCIBIOS_MIN_MEM
    #define PCIBIOS_MIN_IO          0x0100000
    #define PCIBIOS_MIN_MEM         0x1000000
    #endif
    
    struct pci_dev;
    
    /*
     * The PCI address space does equal the physical memory address space.  The
     * networking and block device layers use this boolean for bounce buffer
     * decisions.
     */
    #define PCI_DMA_BUS_IS_PHYS     (1)
    
    /*
     * Allocate and map kernel buffer using consistent mode DMA for a device.
     * hwdev should be valid struct pci_dev pointer for PCI devices,
     * NULL for PCI-like buses (ISA, EISA).
     * Returns non-NULL cpu-view pointer to the buffer if successful and
     * sets *dma_addrp to the pci side dma address as well, else *dma_addrp
     * is undefined.
     */
    extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
                                      dma_addr_t *dma_handle);
    
    /*
     * Free and unmap a consistent DMA buffer.
     * cpu_addr is what was returned from pci_alloc_consistent,
     * size must be the same as what as passed into pci_alloc_consistent,
     * and likewise dma_addr must be the same as what *dma_addrp was set to.
     *
     * References to the memory and mappings associated with cpu_addr/dma_addr
     * past this call are illegal.
     */
    extern void pci_free_consistent(struct pci_dev *hwdev, size_t size,
                                    void *vaddr, dma_addr_t dma_handle);
    
    /*
     * Map a single buffer of the indicated size for DMA in streaming mode.
     * The 32-bit bus address to use is returned.
     *
     * Once the device is given the dma address, the device owns this memory
     * until either pci_unmap_single or pci_dma_sync_single is performed.
     */
    static inline dma_addr_t pci_map_single(struct pci_dev *hwdev, void *ptr,
                                            size_t size, int direction)
    {
            unsigned long addr = (unsigned long) ptr;
    
            if (direction == PCI_DMA_NONE)
                    out_of_line_bug();
    
            dma_cache_wback_inv(addr, size);
    
           return bus_to_baddr(hwdev->bus, __pa(ptr));
   }
   
   /*
    * Unmap a single streaming mode DMA translation.  The dma_addr and size
    * must match what was provided for in a previous pci_map_single call.  All
    * other usages are undefined.
    *
    * After this call, reads by the cpu to the buffer are guarenteed to see
    * whatever the device wrote there.
    */
   static inline void pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
                                       size_t size, int direction)
   {
           if (direction == PCI_DMA_NONE)
                   out_of_line_bug();
   
           if (direction != PCI_DMA_TODEVICE) {
                   unsigned long addr;
   
                   addr = baddr_to_bus(hwdev->bus, dma_addr) + PAGE_OFFSET;
                   dma_cache_wback_inv(addr, size);
           }
   }
   
   /*
    * pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical
    * to pci_map_single, but takes a struct page instead of a virtual address
    */
   static inline dma_addr_t pci_map_page(struct pci_dev *hwdev, struct page *page,
                                         unsigned long offset, size_t size,
                                         int direction)
   {
           unsigned long addr;
   
           if (direction == PCI_DMA_NONE)
                   out_of_line_bug();
   
           addr = (unsigned long) page_address(page) + offset;
           dma_cache_wback_inv(addr, size);
   
           return bus_to_baddr(hwdev->bus, page_to_phys(page) + offset);
   }
   
   static inline void pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
                                     size_t size, int direction)
   {
           if (direction == PCI_DMA_NONE)
                   out_of_line_bug();
   
           if (direction != PCI_DMA_TODEVICE) {
                   unsigned long addr;
   
                   addr = baddr_to_bus(hwdev->bus, dma_address) + PAGE_OFFSET;
                   dma_cache_wback_inv(addr, size);
           }
   }
   
   /* pci_unmap_{page,single} is a nop so... */
   #define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
   #define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
   #define pci_unmap_addr(PTR, ADDR_NAME)          (0)
   #define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
   #define pci_unmap_len(PTR, LEN_NAME)            (0)
   #define pci_unmap_len_set(PTR, LEN_NAME, VAL)   do { } while (0)
   
   /*
    * Map a set of buffers described by scatterlist in streaming
    * mode for DMA.  This is the scather-gather version of the
    * above pci_map_single interface.  Here the scatter gather list
    * elements are each tagged with the appropriate dma address
    * and length.  They are obtained via sg_dma_{address,length}(SG).
    *
    * NOTE: An implementation may be able to use a smaller number of
    *       DMA address/length pairs than there are SG table elements.
    *       (for example via virtual mapping capabilities)
    *       The routine returns the number of addr/length pairs actually
    *       used, at most nents.
    *
    * Device ownership issues as mentioned above for pci_map_single are
    * the same here.
    */
   static inline int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
                                int nents, int direction)
   {
           int i;
   
           if (direction == PCI_DMA_NONE)
                   out_of_line_bug();
   
           for (i = 0; i < nents; i++, sg++) {
                   if (sg->address && sg->page)
                           out_of_line_bug();
                   else if (!sg->address && !sg->page)
                           out_of_line_bug();
   
                   if (sg->address) {
                           dma_cache_wback_inv((unsigned long)sg->address,
                                               sg->length);
                           sg->dma_address = bus_to_baddr(hwdev->bus, __pa(sg->address));
                   } else {
                           sg->dma_address = page_to_bus(sg->page) +
                                             sg->offset;
                           dma_cache_wback_inv((unsigned long)
                                   (page_address(sg->page) + sg->offset),
                                   sg->length);
                   }
           }
   
           return nents;
   }
   
   /*
    * Unmap a set of streaming mode DMA translations.
    * Again, cpu read rules concerning calls here are the same as for
    * pci_unmap_single() above.
    */
   static inline void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
                                   int nents, int direction)
   {
           int i;
   
           if (direction == PCI_DMA_NONE)
                   out_of_line_bug();
   
           if (direction == PCI_DMA_TODEVICE)
                   return;
   
           for (i = 0; i < nents; i++, sg++) {
                   if (sg->address && sg->page)
                           out_of_line_bug();
                   else if (!sg->address && !sg->page)
                           out_of_line_bug();
   
                   if (!sg->address)
                           continue;
                   dma_cache_wback_inv((unsigned long)sg->address, sg->length);
           }
   }
   
   /*
    * Make physical memory consistent for a single
    * streaming mode DMA translation after a transfer.
    *
    * If you perform a pci_map_single() but wish to interrogate the
    * buffer using the cpu, yet do not wish to teardown the PCI dma
    * mapping, you must call this function before doing so.  At the
    * next point you give the PCI dma address back to the card, the
    * device again owns the buffer.
    */
   static inline void pci_dma_sync_single(struct pci_dev *hwdev,
                                          dma_addr_t dma_handle,
                                          size_t size, int direction)
   {
           unsigned long addr;
   
           if (direction == PCI_DMA_NONE)
                   out_of_line_bug();
   
           addr = baddr_to_bus(hwdev->bus, dma_handle) + PAGE_OFFSET;
           dma_cache_wback_inv(addr, size);
   }
   
   /*
    * Make physical memory consistent for a set of streaming
    * mode DMA translations after a transfer.
    *
    * The same as pci_dma_sync_single but for a scatter-gather list,
    * same rules and usage.
    */
   static inline void pci_dma_sync_sg(struct pci_dev *hwdev,
                                      struct scatterlist *sg,
                                      int nelems, int direction)
   {
   #ifdef CONFIG_NONCOHERENT_IO
           int i;
   #endif
   
           if (direction == PCI_DMA_NONE)
                   out_of_line_bug();
   
           /* Make sure that gcc doesn't leave the empty loop body.  */
   #ifdef CONFIG_NONCOHERENT_IO
           for (i = 0; i < nelems; i++, sg++)
                   dma_cache_wback_inv((unsigned long)sg->address, sg->length);
   #endif
   }
   
   /*
    * Return whether the given PCI device DMA address mask can
    * be supported properly.  For example, if your device can
    * only drive the low 24-bits during PCI bus mastering, then
    * you would pass 0x00ffffff as the mask to this function.
    */
   static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
   {
           /*
            * we fall back to GFP_DMA when the mask isn't all 1s,
            * so we can't guarantee allocations that must be
            * within a tighter range than GFP_DMA..
            */
   #ifdef CONFIG_ISA
           if (mask < 0x00ffffff)
                   return 0;
   #endif
   
           return 1;
   }
   
   /* This is always fine. */
   #define pci_dac_dma_supported(pci_dev, mask)    (1)
   
   static inline dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
           struct page *page, unsigned long offset, int direction)
   {
           dma64_addr_t addr = page_to_phys(page) + offset;
   
           return (dma64_addr_t) bus_to_baddr(pdev->bus, addr);
   }
   
   static inline struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
           dma64_addr_t dma_addr)
   {
           unsigned long poff = baddr_to_bus(pdev->bus, dma_addr) >> PAGE_SHIFT;
   
           return mem_map + poff;
   }
   
   static inline unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
           dma64_addr_t dma_addr)
   {
           return dma_addr & ~PAGE_MASK;
   }
   
   static inline void pci_dac_dma_sync_single(struct pci_dev *pdev,
           dma64_addr_t dma_addr, size_t len, int direction)
   {
           unsigned long addr;
   
           if (direction == PCI_DMA_NONE)
                   BUG();
   
           addr = baddr_to_bus(pdev->bus, dma_addr) + PAGE_OFFSET;
           dma_cache_wback_inv(addr, len);
   }
   
   /*
    * Return the index of the PCI controller for device.
    */
   #define pci_controller_num(pdev)        ({ (void)(pdev); 0; })
   
   /*
    * These macros should be used after a pci_map_sg call has been done
    * to get bus addresses of each of the SG entries and their lengths.
    * You should only work with the number of sg entries pci_map_sg
    * returns, or alternatively stop on the first sg_dma_len(sg) which
    * is 0.
    */
   #define sg_dma_address(sg)      ((sg)->dma_address)
   #define sg_dma_len(sg)          ((sg)->length)
   
   #endif /* __KERNEL__ */
   
   #endif /* _ASM_PCI_H */

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