b5ee900258
Let's provide an overridable default instead of having every machine class define __virt_to_bus and __bus_to_virt to the same thing. What most platforms are using is bus_addr == phys_addr so such is the default. One exception is ebsa110 which has no DMA what so ever, so the actual definition is not important except only for proper compilation. Also added a comment about the special footbridge bus translation. Let's also remove comments alluding to set_dma_addr which is not (and should not) be commonly used. Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
#ifndef __ASM_ARCH_MEMORY_H
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#define __ASM_ARCH_MEMORY_H
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#include <mach/hardware.h>
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/*
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* Physical DRAM offset.
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*/
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#define PHYS_OFFSET UL(0x00000000)
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_ARCH_IOP13XX)
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#define IOP13XX_PMMR_V_START (IOP13XX_PMMR_VIRT_MEM_BASE)
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#define IOP13XX_PMMR_V_END (IOP13XX_PMMR_VIRT_MEM_BASE + IOP13XX_PMMR_SIZE)
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#define IOP13XX_PMMR_P_START (IOP13XX_PMMR_PHYS_MEM_BASE)
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#define IOP13XX_PMMR_P_END (IOP13XX_PMMR_PHYS_MEM_BASE + IOP13XX_PMMR_SIZE)
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static inline dma_addr_t __virt_to_lbus(unsigned long x)
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{
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return x + IOP13XX_PMMR_PHYS_MEM_BASE - IOP13XX_PMMR_VIRT_MEM_BASE;
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}
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static inline unsigned long __lbus_to_virt(dma_addr_t x)
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{
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return x + IOP13XX_PMMR_VIRT_MEM_BASE - IOP13XX_PMMR_PHYS_MEM_BASE;
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}
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#define __is_lbus_dma(a) \
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((a) >= IOP13XX_PMMR_P_START && (a) < IOP13XX_PMMR_P_END)
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#define __is_lbus_virt(a) \
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((a) >= IOP13XX_PMMR_V_START && (a) < IOP13XX_PMMR_V_END)
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/* Device is an lbus device if it is on the platform bus of the IOP13XX */
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#define is_lbus_device(dev) \
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(dev && strncmp(dev->bus->name, "platform", 8) == 0)
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#define __arch_dma_to_virt(dev, addr) \
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({ \
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unsigned long __virt; \
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dma_addr_t __dma = addr; \
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if (is_lbus_device(dev) && __is_lbus_dma(__dma)) \
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__virt = __lbus_to_virt(__dma); \
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else \
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__virt = __phys_to_virt(__dma); \
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(void *)__virt; \
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})
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#define __arch_virt_to_dma(dev, addr) \
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({ \
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unsigned long __virt = (unsigned long)addr; \
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dma_addr_t __dma; \
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if (is_lbus_device(dev) && __is_lbus_virt(__virt)) \
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__dma = __virt_to_lbus(__virt); \
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else \
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__dma = __virt_to_phys(__virt); \
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__dma; \
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})
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#define __arch_page_to_dma(dev, page) \
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__arch_virt_to_dma(dev, page_address(page))
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#endif /* CONFIG_ARCH_IOP13XX */
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#endif /* !ASSEMBLY */
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#define PFN_TO_NID(addr) (0)
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#endif
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