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

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  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
 53 

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