memory.h

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#ifndef __ASM_ARCH_MEMORY_H
#define __ASM_ARCH_MEMORY_H

#include <mach/hardware.h>

/*
 * Physical DRAM offset.
 */
#define PLAT_PHYS_OFFSET    UL(0x00000000)

#ifndef __ASSEMBLY__

#if defined(CONFIG_ARCH_IOP13XX)
#define IOP13XX_PMMR_V_START (IOP13XX_PMMR_VIRT_MEM_BASE)
#define IOP13XX_PMMR_V_END   (IOP13XX_PMMR_VIRT_MEM_BASE + IOP13XX_PMMR_SIZE)
#define IOP13XX_PMMR_P_START (IOP13XX_PMMR_PHYS_MEM_BASE)
#define IOP13XX_PMMR_P_END   (IOP13XX_PMMR_PHYS_MEM_BASE + IOP13XX_PMMR_SIZE)

static inline dma_addr_t __virt_to_lbus(void __iomem *x)
{
    return x + IOP13XX_PMMR_PHYS_MEM_BASE - IOP13XX_PMMR_VIRT_MEM_BASE;
}

static inline void __iomem *__lbus_to_virt(dma_addr_t x)
{
    return x + IOP13XX_PMMR_VIRT_MEM_BASE - IOP13XX_PMMR_PHYS_MEM_BASE;
}

#define __is_lbus_dma(a)                \
    ((a) >= IOP13XX_PMMR_P_START && (a) < IOP13XX_PMMR_P_END)

#define __is_lbus_virt(a)               \
    ((a) >= IOP13XX_PMMR_V_START && (a) < IOP13XX_PMMR_V_END)

/* Device is an lbus device if it is on the platform bus of the IOP13XX */
#define is_lbus_device(dev)                 \
    (dev && strncmp(dev->bus->name, "platform", 8) == 0)

#define __arch_dma_to_virt(dev, addr)                   \
    ({                              \
        void * __virt;                      \
        dma_addr_t __dma = addr;                \
        if (is_lbus_device(dev) && __is_lbus_dma(__dma))    \
            __virt = __lbus_to_virt(__dma);         \
        else                            \
            __virt = (void *)__phys_to_virt(__dma);     \
        __virt;                         \
    })

#define __arch_virt_to_dma(dev, addr)                   \
    ({                              \
        void * __virt = addr;                   \
        dma_addr_t __dma;                   \
        if (is_lbus_device(dev) && __is_lbus_virt(__virt))  \
            __dma = __virt_to_lbus(__virt);         \
        else                            \
            __dma = __virt_to_phys((unsigned long)__virt);  \
        __dma;                          \
    })

#define __arch_pfn_to_dma(dev, pfn)                 \
    ({                              \
        /* __is_lbus_virt() can never be true for RAM pages */  \
        (dma_addr_t)__pfn_to_phys(pfn);             \
    })

#define __arch_dma_to_pfn(dev, addr)    __phys_to_pfn(addr)

#endif /* CONFIG_ARCH_IOP13XX */
#endif /* !ASSEMBLY */

#endif