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  * Physical DRAM offset.
  10  */
  11 #define PLAT_PHYS_OFFSET                UL(0x10000000)
  12
  13 /*
  14  * Bus address is physical address, except for OMAP-1510 Local Bus.
  15  * OMAP-1510 bus address is translated into a Local Bus address if the
  16  * OMAP bus type is lbus. We do the address translation based on the
  17  * device overriding the defaults used in the dma-mapping API.
  18  * Note that the is_lbus_device() test is not very efficient on 1510
  19  * because of the strncmp().
  20  */
  21 #ifdef CONFIG_ARCH_OMAP15XX
  22
  23 /*
  24  * OMAP-1510 Local Bus address offset
  25  */
  26 #define OMAP1510_LB_OFFSET      UL(0x30000000)
  27
  28 #define virt_to_lbus(x)         ((x) - PAGE_OFFSET + OMAP1510_LB_OFFSET)
  29 #define lbus_to_virt(x)         ((x) - OMAP1510_LB_OFFSET + PAGE_OFFSET)
  30 #define is_lbus_device(dev)     (cpu_is_omap15xx() && dev && (strncmp(dev_name(dev), "ohci", 4) == 0))
  31
  32 #define __arch_pfn_to_dma(dev, pfn)     \
  33         ({ dma_addr_t __dma = __pfn_to_phys(pfn); \
  34            if (is_lbus_device(dev)) \
  35                 __dma = __dma - PHYS_OFFSET + OMAP1510_LB_OFFSET; \
  36            __dma; })
  37
  38 #define __arch_dma_to_pfn(dev, addr)    \
  39         ({ dma_addr_t __dma = addr;                             \
  40            if (is_lbus_device(dev))                             \
  41                 __dma += PHYS_OFFSET - OMAP1510_LB_OFFSET;      \
  42            __phys_to_pfn(__dma);                                \
  43         })
  44
  45 #define __arch_dma_to_virt(dev, addr)   ({ (void *) (is_lbus_device(dev) ? \
  46                                                 lbus_to_virt(addr) : \
  47                                                 __phys_to_virt(addr)); })
  48
  49 #define __arch_virt_to_dma(dev, addr)   ({ unsigned long __addr = (unsigned long)(addr); \
  50                                            (dma_addr_t) (is_lbus_device(dev) ? \
  51                                                 virt_to_lbus(__addr) : \
  52                                                 __virt_to_phys(__addr)); })
  53
  54 #endif  /* CONFIG_ARCH_OMAP15XX */
  55
  56 #endif