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