arch/arm/mach-omap1/include/mach/memory.h

   1 /*
   2  * arch/arm/mach-omap1/include/mach/memory.h
   3  */
   4
   5 #ifndef __ASM_ARCH_MEMORY_H
   6 #define __ASM_ARCH_MEMORY_H
   7
   8 /* REVISIT: omap1 legacy drivers still rely on this */
   9 #include <mach/soc.h>
  10
  11 /*
  12  * Bus address is physical address, except for OMAP-1510 Local Bus.
  13  * OMAP-1510 bus address is translated into a Local Bus address if the
  14  * OMAP bus type is lbus. We do the address translation based on the
  15  * device overriding the defaults used in the dma-mapping API.
  16  * Note that the is_lbus_device() test is not very efficient on 1510
  17  * because of the strncmp().
  18  */
  19 #if defined(CONFIG_ARCH_OMAP15XX) && !defined(__ASSEMBLER__)
  20
  21 /*
  22  * OMAP-1510 Local Bus address offset
  23  */
  24 #define OMAP1510_LB_OFFSET      UL(0x30000000)
  25
  26 #define virt_to_lbus(x)         ((x) - PAGE_OFFSET + OMAP1510_LB_OFFSET)
  27 #define lbus_to_virt(x)         ((x) - OMAP1510_LB_OFFSET + PAGE_OFFSET)
  28 #define is_lbus_device(dev)     (cpu_is_omap15xx() && dev && (strncmp(dev_name(dev), "ohci", 4) == 0))
  29
  30 #define __arch_pfn_to_dma(dev, pfn)     \
  31         ({ dma_addr_t __dma = __pfn_to_phys(pfn); \
  32            if (is_lbus_device(dev)) \
  33                 __dma = __dma - PHYS_OFFSET + OMAP1510_LB_OFFSET; \
  34            __dma; })
  35
  36 #define __arch_dma_to_pfn(dev, addr)    \
  37         ({ dma_addr_t __dma = addr;                             \
  38            if (is_lbus_device(dev))                             \
  39                 __dma += PHYS_OFFSET - OMAP1510_LB_OFFSET;      \
  40            __phys_to_pfn(__dma);                                \
  41         })
  42
  43 #define __arch_dma_to_virt(dev, addr)   ({ (void *) (is_lbus_device(dev) ? \
  44                                                 lbus_to_virt(addr) : \
  45                                                 __phys_to_virt(addr)); })
  46
  47 #define __arch_virt_to_dma(dev, addr)   ({ unsigned long __addr = (unsigned long)(addr); \
  48                                            (dma_addr_t) (is_lbus_device(dev) ? \
  49                                                 virt_to_lbus(__addr) : \
  50                                                 __virt_to_phys(__addr)); })
  51
  52 #endif  /* CONFIG_ARCH_OMAP15XX */
  53
  54 #endif