release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-iop13xx/include/mach/memory.h

   1 #ifndef __ASM_ARCH_MEMORY_H
   2 #define __ASM_ARCH_MEMORY_H
   3
   4 #include <mach/hardware.h>
   5
   6 /*
   7  * Physical DRAM offset.
   8  */
   9 #define PHYS_OFFSET     UL(0x00000000)
  10
  11 #ifndef __ASSEMBLY__
  12
  13 #if defined(CONFIG_ARCH_IOP13XX)
  14 #define IOP13XX_PMMR_V_START (IOP13XX_PMMR_VIRT_MEM_BASE)
  15 #define IOP13XX_PMMR_V_END   (IOP13XX_PMMR_VIRT_MEM_BASE + IOP13XX_PMMR_SIZE)
  16 #define IOP13XX_PMMR_P_START (IOP13XX_PMMR_PHYS_MEM_BASE)
  17 #define IOP13XX_PMMR_P_END   (IOP13XX_PMMR_PHYS_MEM_BASE + IOP13XX_PMMR_SIZE)
  18
  19 static inline dma_addr_t __virt_to_lbus(unsigned long x)
  20 {
  21         return x + IOP13XX_PMMR_PHYS_MEM_BASE - IOP13XX_PMMR_VIRT_MEM_BASE;
  22 }
  23
  24 static inline unsigned long __lbus_to_virt(dma_addr_t x)
  25 {
  26         return x + IOP13XX_PMMR_VIRT_MEM_BASE - IOP13XX_PMMR_PHYS_MEM_BASE;
  27 }
  28
  29 #define __is_lbus_dma(a)                                \
  30         ((a) >= IOP13XX_PMMR_P_START && (a) < IOP13XX_PMMR_P_END)
  31
  32 #define __is_lbus_virt(a)                               \
  33         ((a) >= IOP13XX_PMMR_V_START && (a) < IOP13XX_PMMR_V_END)
  34
  35 /* Device is an lbus device if it is on the platform bus of the IOP13XX */
  36 #define is_lbus_device(dev)                             \
  37         (dev && strncmp(dev->bus->name, "platform", 8) == 0)
  38
  39 #define __arch_dma_to_virt(dev, addr)                                   \
  40         ({                                                              \
  41                 unsigned long __virt;                                   \
  42                 dma_addr_t __dma = addr;                                \
  43                 if (is_lbus_device(dev) && __is_lbus_dma(__dma))        \
  44                         __virt = __lbus_to_virt(__dma);                 \
  45                 else                                                    \
  46                         __virt = __phys_to_virt(__dma);                 \
  47                 (void *)__virt;                                         \
  48         })
  49
  50 #define __arch_virt_to_dma(dev, addr)                                   \
  51         ({                                                              \
  52                 unsigned long __virt = (unsigned long)addr;             \
  53                 dma_addr_t __dma;                                       \
  54                 if (is_lbus_device(dev) && __is_lbus_virt(__virt))      \
  55                         __dma = __virt_to_lbus(__virt);                 \
  56                 else                                                    \
  57                         __dma = __virt_to_phys(__virt);                 \
  58                 __dma;                                                  \
  59         })
  60
  61 #define __arch_page_to_dma(dev, page)                                   \
  62         ({                                                              \
  63                 /* __is_lbus_virt() can never be true for RAM pages */  \
  64                 (dma_addr_t)page_to_phys(page);                         \
  65         })
  66
  67 #define __arch_dma_to_page(dev, addr)   phys_to_page(addr)
  68
  69 #endif /* CONFIG_ARCH_IOP13XX */
  70 #endif /* !ASSEMBLY */
  71
  72 #endif