[ARM] remove a common set of __virt_to_bus definitions

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>

arch/arm/include/asm/memory.h

@@ -178,6 +178,11 @@ static inline void *phys_to_virt(unsigned long x)
  * memory.  Use of these is *deprecated* (and that doesn't mean
  * use the __ prefixed forms instead.)  See dma-mapping.h.
  */
+#ifndef __virt_to_bus
+#define __virt_to_bus	__virt_to_phys
+#define __bus_to_virt	__phys_to_virt
+#endif
+
 static inline __deprecated unsigned long virt_to_bus(void *x)
 {
 	return __virt_to_bus((unsigned long)x);

arch/arm/mach-aaec2000/include/mach/memory.h

@@ -14,9 +14,6 @@
 
 #define PHYS_OFFSET	UL(0xf0000000)
 
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
 /*
  * The nodes are the followings:
  *

arch/arm/mach-at91/include/mach/memory.h

@@ -25,15 +25,4 @@
 
 #define PHYS_OFFSET	(AT91_SDRAM_BASE)
 
-
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *              address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *              to an address that the kernel can use.
- */
-#define __virt_to_bus(x) __virt_to_phys(x)
-#define __bus_to_virt(x) __phys_to_virt(x)
-
 #endif

arch/arm/mach-clps711x/include/mach/memory.h

@@ -26,25 +26,7 @@
  */
 #define PHYS_OFFSET	UL(0xc0000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *              address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *              to an address that the kernel can use.
- */
-
-#if defined(CONFIG_ARCH_CDB89712)
-
-#define __virt_to_bus(x)	(x)
-#define __bus_to_virt(x)	(x)
-
-#elif defined (CONFIG_ARCH_AUTCPU12)
-
-#define __virt_to_bus(x)	(x)
-#define __bus_to_virt(x)	(x)
-
-#else
+#if !defined(CONFIG_ARCH_CDB89712) && !defined (CONFIG_ARCH_AUTCPU12)
 
 #define __virt_to_bus(x)	((x) - PAGE_OFFSET)
 #define __bus_to_virt(x)	((x) + PAGE_OFFSET)

arch/arm/mach-clps7500/include/mach/memory.h

@@ -19,13 +19,6 @@
  */
 #define PHYS_OFFSET	UL(0x10000000)
 
-/*
- * These are exactly the same on the RiscPC as the
- * physical memory view.
- */
-#define __virt_to_bus(x) __virt_to_phys(x)
-#define __bus_to_virt(x) __phys_to_virt(x)
-
 /*
  * Cache flushing area - ROM
  */

arch/arm/mach-davinci/include/mach/memory.h

@@ -55,10 +55,4 @@ __arch_adjust_zones(int node, unsigned long *size, unsigned long *holes)
 
 #endif
 
-/*
- * Bus address is physical address
- */
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
 #endif /* __ASM_ARCH_MEMORY_H */

arch/arm/mach-ebsa110/include/mach/memory.h

@@ -21,13 +21,6 @@
  */
 #define PHYS_OFFSET	UL(0x00000000)
 
-/*
- * We keep this 1:1 so that we don't interfere
- * with the PCMCIA memory regions
- */
-#define __virt_to_bus(x)	(x)
-#define __bus_to_virt(x)	(x)
-
 /*
  * Cache flushing area - SRAM
  */

arch/arm/mach-ep93xx/include/mach/memory.h

@@ -7,8 +7,4 @@
 
 #define PHYS_OFFSET		UL(0x00000000)
 
-#define __bus_to_virt(x)	__phys_to_virt(x)
-#define __virt_to_bus(x)	__virt_to_phys(x)
-
-
 #endif

arch/arm/mach-footbridge/include/mach/memory.h

@@ -30,9 +30,18 @@
 extern unsigned long __virt_to_bus(unsigned long);
 extern unsigned long __bus_to_virt(unsigned long);
 #endif
+#define __virt_to_bus	__virt_to_bus
+#define __bus_to_virt	__bus_to_virt
 
 #elif defined(CONFIG_FOOTBRIDGE_HOST)
 
+/*
+ * The footbridge is programmed to expose the system RAM at the corresponding
+ * address.  So, if PAGE_OFFSET is 0xc0000000, RAM appears at 0xe0000000.
+ * If 0x80000000, then its exposed at 0xa0000000 on the bus. etc.
+ * The only requirement is that the RAM isn't placed at bus address 0 which
+ * would clash with VGA cards.
+ */
 #define __virt_to_bus(x)	((x) - 0xe0000000)
 #define __bus_to_virt(x)	((x) + 0xe0000000)
 

arch/arm/mach-h720x/include/mach/memory.h

@@ -7,23 +7,6 @@
 #ifndef __ASM_ARCH_MEMORY_H
 #define __ASM_ARCH_MEMORY_H
 
-/*
- * Page offset:
- *    ( 0xc0000000UL )
- */
 #define PHYS_OFFSET	UL(0x40000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *              address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *              to an address that the kernel can use.
- *
- * There is something to do here later !, Mar 2000, Jungjun Kim
- */
-
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
 #endif

arch/arm/mach-imx/include/mach/memory.h

@@ -23,14 +23,4 @@
 
 #define PHYS_OFFSET	UL(0x08000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *              address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *              to an address that the kernel can use.
- */
-#define __virt_to_bus(x)	(x - PAGE_OFFSET + PHYS_OFFSET)
-#define __bus_to_virt(x)	(x - PHYS_OFFSET + PAGE_OFFSET)
-
 #endif

arch/arm/mach-integrator/include/mach/memory.h

@@ -24,15 +24,8 @@
  * Physical DRAM offset.
  */
 #define PHYS_OFFSET	UL(0x00000000)
-#define BUS_OFFSET	UL(0x80000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *              address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *              to an address that the kernel can use.
- */
+#define BUS_OFFSET	UL(0x80000000)
 #define __virt_to_bus(x)	(x - PAGE_OFFSET + BUS_OFFSET)
 #define __bus_to_virt(x)	(x - BUS_OFFSET + PAGE_OFFSET)
 

arch/arm/mach-iop13xx/include/mach/memory.h

@@ -16,18 +16,6 @@
 #define IOP13XX_PMMR_P_START (IOP13XX_PMMR_PHYS_MEM_BASE)
 #define IOP13XX_PMMR_P_END   (IOP13XX_PMMR_PHYS_MEM_BASE + IOP13XX_PMMR_SIZE)
 
-/*
- * Virtual view <-> PCI DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *		address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *		to an address that the kernel can use.
- */
-
-/* RAM has 1:1 mapping on the PCIe/x Busses */
-#define __virt_to_bus(x)	(__virt_to_phys(x))
-#define __bus_to_virt(x)	(__phys_to_virt(x))
-
 static inline dma_addr_t __virt_to_lbus(unsigned long x)
 {
 	return x + IOP13XX_PMMR_PHYS_MEM_BASE - IOP13XX_PMMR_VIRT_MEM_BASE;
@@ -55,7 +43,7 @@ static inline unsigned long __lbus_to_virt(dma_addr_t x)
 		if (is_lbus_device(dev) && __is_lbus_dma(__dma))	\
 			__virt = __lbus_to_virt(__dma);			\
 		else							\
-			__virt = __bus_to_virt(__dma);			\
+			__virt = __phys_to_virt(__dma);			\
 		(void *)__virt;						\
 	})
 
@@ -66,7 +54,7 @@ static inline unsigned long __lbus_to_virt(dma_addr_t x)
 		if (is_lbus_device(dev) && __is_lbus_virt(__virt))	\
 			__dma = __virt_to_lbus(__virt);			\
 		else							\
-			__dma = __virt_to_bus(__virt);			\
+			__dma = __virt_to_phys(__virt);			\
 		__dma;							\
 	})
 

arch/arm/mach-iop32x/include/mach/memory.h

@@ -12,15 +12,4 @@
  */
 #define PHYS_OFFSET	UL(0xa0000000)
 
-/*
- * Virtual view <-> PCI DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *		address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *		to an address that the kernel can use.
- */
-#define __virt_to_bus(x)	(__virt_to_phys(x))
-#define __bus_to_virt(x)	(__phys_to_virt(x))
-
-
 #endif

arch/arm/mach-iop33x/include/mach/memory.h

@@ -12,15 +12,4 @@
  */
 #define PHYS_OFFSET	UL(0x00000000)
 
-/*
- * Virtual view <-> PCI DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *		address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *		to an address that the kernel can use.
- */
-#define __virt_to_bus(x)	(__virt_to_phys(x))
-#define __bus_to_virt(x)	(__phys_to_virt(x))
-
-
 #endif

arch/arm/mach-ixp2000/include/mach/memory.h

@@ -15,13 +15,6 @@
 
 #define PHYS_OFFSET	UL(0x00000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *		address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *		to an address that the kernel can use.
- */
 #include <mach/ixp2000-regs.h>
 
 #define __virt_to_bus(v) \

arch/arm/mach-ixp23xx/include/mach/memory.h

@@ -19,16 +19,6 @@
  */
 #define PHYS_OFFSET		(0x00000000)
 
-
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *		address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *		to an address that the kernel can use.
- */
-#ifndef __ASSEMBLY__
-
 #define __virt_to_bus(v)						\
 	({ unsigned int ret;						\
 	ret = ((__virt_to_phys(v) - 0x00000000) +			\
@@ -43,6 +33,3 @@
 #define arch_is_coherent()	1
 
 #endif
-
-
-#endif

arch/arm/mach-ixp4xx/include/mach/memory.h

@@ -25,16 +25,4 @@ void ixp4xx_adjust_zones(int node, unsigned long *size, unsigned long *holes);
 
 #endif
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *		address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *		to an address that the kernel can use.
- *
- * These are dummies for now.
- */
-#define __virt_to_bus(x)	 __virt_to_phys(x)
-#define __bus_to_virt(x)	 __phys_to_virt(x)
-
 #endif

arch/arm/mach-kirkwood/include/mach/memory.h

@@ -7,8 +7,4 @@
 
 #define PHYS_OFFSET		UL(0x00000000)
 
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
-
 #endif

arch/arm/mach-ks8695/include/mach/memory.h

@@ -37,11 +37,6 @@ extern struct bus_type platform_bus_type;
 					(dma_addr_t)__virt_to_phys(x) : (dma_addr_t)__virt_to_bus(x); })
 #define __arch_page_to_dma(dev, x)	__arch_virt_to_dma(dev, page_address(x))
 
-#else
-
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
 #endif
 
 #endif

arch/arm/mach-l7200/include/mach/memory.h

@@ -17,9 +17,6 @@
  */
 #define PHYS_OFFSET     UL(0xf0000000)
 
-#define __virt_to_bus(x) __virt_to_phys(x)
-#define __bus_to_virt(x) __phys_to_virt(x)
-
 /*
  * Cache flushing area - ROM
  */

arch/arm/mach-lh7a40x/include/mach/memory.h

@@ -19,16 +19,6 @@
  */
 #define PHYS_OFFSET	UL(0xc0000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *		address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *		to an address that the kernel can use.
- */
-#define __virt_to_bus(x)	 __virt_to_phys(x)
-#define __bus_to_virt(x)	 __phys_to_virt(x)
-
 #ifdef CONFIG_DISCONTIGMEM
 
 /*

arch/arm/mach-loki/include/mach/memory.h

@@ -7,8 +7,4 @@
 
 #define PHYS_OFFSET		UL(0x00000000)
 
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
-
 #endif

arch/arm/mach-msm/include/mach/memory.h

@@ -19,9 +19,5 @@
 /* physical offset of RAM */
 #define PHYS_OFFSET		UL(0x10000000)
 
-/* bus address and physical addresses are identical */
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
 #endif
 

arch/arm/mach-mv78xx0/include/mach/memory.h

@@ -7,8 +7,4 @@
 
 #define PHYS_OFFSET		UL(0x00000000)
 
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
-
 #endif

arch/arm/mach-netx/include/mach/memory.h

@@ -22,15 +22,5 @@
 
 #define PHYS_OFFSET UL(0x80000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *              address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *              to an address that the kernel can use.
- */
-#define __virt_to_bus(x)         __virt_to_phys(x)
-#define __bus_to_virt(x)         __phys_to_virt(x)
-
 #endif
 

arch/arm/mach-ns9xxx/include/mach/memory.h

@@ -21,7 +21,4 @@
 
 #define PHYS_OFFSET	UL(0x00000000)
 
-#define __virt_to_bus(x) __virt_to_phys(x)
-#define __bus_to_virt(x) __phys_to_virt(x)
-
 #endif

arch/arm/mach-orion5x/include/mach/memory.h

@@ -9,8 +9,4 @@
 
 #define PHYS_OFFSET	UL(0x00000000)
 
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
-
 #endif

arch/arm/mach-pnx4008/include/mach/memory.h

@@ -18,7 +18,4 @@
  */
 #define PHYS_OFFSET     (0x80000000)
 
-#define __virt_to_bus(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
-#define __bus_to_virt(x) ((x) + PAGE_OFFSET - PHYS_OFFSET)
-
 #endif

arch/arm/mach-pxa/include/mach/memory.h

@@ -17,16 +17,6 @@
  */
 #define PHYS_OFFSET	UL(0xa0000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *		address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *		to an address that the kernel can use.
- */
-#define __virt_to_bus(x)	 __virt_to_phys(x)
-#define __bus_to_virt(x)	 __phys_to_virt(x)
-
 /*
  * The nodes are matched with the physical SDRAM banks as follows:
  *

arch/arm/mach-realview/include/mach/memory.h

@@ -25,14 +25,4 @@
  */
 #define PHYS_OFFSET		UL(0x00000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *              address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *              to an address that the kernel can use.
- */
-#define __virt_to_bus(x)	((x) - PAGE_OFFSET)
-#define __bus_to_virt(x)	((x) + PAGE_OFFSET)
-
 #endif

arch/arm/mach-rpc/include/mach/memory.h

@@ -23,13 +23,6 @@
  */
 #define PHYS_OFFSET	UL(0x10000000)
 
-/*
- * These are exactly the same on the RiscPC as the
- * physical memory view.
- */
-#define __virt_to_bus(x) __virt_to_phys(x)
-#define __bus_to_virt(x) __phys_to_virt(x)
-
 /*
  * Cache flushing area - ROM
  */

arch/arm/mach-s3c2400/include/mach/memory.h

@@ -17,7 +17,4 @@
 
 #define PHYS_OFFSET	UL(0x0C000000)
 
-#define __virt_to_bus(x) __virt_to_phys(x)
-#define __bus_to_virt(x) __phys_to_virt(x)
-
 #endif

arch/arm/mach-s3c2410/include/mach/memory.h

@@ -13,7 +13,4 @@
 
 #define PHYS_OFFSET	UL(0x30000000)
 
-#define __virt_to_bus(x) __virt_to_phys(x)
-#define __bus_to_virt(x) __phys_to_virt(x)
-
 #endif

arch/arm/mach-sa1100/include/mach/memory.h

@@ -27,18 +27,6 @@ void sa1111_adjust_zones(int node, unsigned long *size, unsigned long *holes);
 #endif
 #endif
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *		address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *		to an address that the kernel can use.
- *
- * On the SA1100, bus addresses are equivalent to physical addresses.
- */
-#define __virt_to_bus(x)	 __virt_to_phys(x)
-#define __bus_to_virt(x)	 __phys_to_virt(x)
-
 /*
  * Because of the wide memory address space between physical RAM banks on the
  * SA1100, it's much convenient to use Linux's SparseMEM support to implement

arch/arm/mach-shark/include/mach/memory.h

@@ -36,9 +36,6 @@ static inline void __arch_adjust_zones(int node, unsigned long *zone_size, unsig
 
 #endif
 
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
 /*
  * Cache flushing area
  */

arch/arm/mach-versatile/include/mach/memory.h

@@ -25,14 +25,4 @@
  */
 #define PHYS_OFFSET	UL(0x00000000)
 
-/*
- * Virtual view <-> DMA view memory address translations
- * virt_to_bus: Used to translate the virtual address to an
- *              address suitable to be passed to set_dma_addr
- * bus_to_virt: Used to convert an address for DMA operations
- *              to an address that the kernel can use.
- */
-#define __virt_to_bus(x)	((x) - PAGE_OFFSET)
-#define __bus_to_virt(x)	((x) + PAGE_OFFSET)
-
 #endif

arch/arm/plat-mxc/include/mach/memory.h

@@ -13,17 +13,4 @@
 
 #include <mach/hardware.h>
 
-/*
- * Virtual view <-> DMA view memory address translations
- * This macro is used to translate the virtual address to an address
- * suitable to be passed to set_dma_addr()
- */
-#define __virt_to_bus(a)	__virt_to_phys(a)
-
-/*
- * Used to convert an address for DMA operations to an address that the
- * kernel can use.
- */
-#define __bus_to_virt(a)	__phys_to_virt(a)
-
 #endif /* __ASM_ARCH_MXC_MEMORY_H__ */

arch/arm/plat-omap/include/mach/memory.h

@@ -42,19 +42,8 @@
 #define PHYS_OFFSET		UL(0x80000000)
 #endif
 
-/*
- * Conversion between SDRAM and fake PCI bus, used by USB
- * NOTE: Physical address must be converted to Local Bus address
- *	 on OMAP-1510 only
- */
-
 /*
  * Bus address is physical address, except for OMAP-1510 Local Bus.
- */
-#define __virt_to_bus(x)	__virt_to_phys(x)
-#define __bus_to_virt(x)	__phys_to_virt(x)
-
-/*
  * OMAP-1510 bus address is translated into a Local Bus address if the
  * OMAP bus type is lbus. We do the address translation based on the
  * device overriding the defaults used in the dma-mapping API.
@@ -74,16 +63,16 @@
 
 #define __arch_page_to_dma(dev, page)	({is_lbus_device(dev) ? \
 					(dma_addr_t)virt_to_lbus(page_address(page)) : \
-					(dma_addr_t)__virt_to_bus(page_address(page));})
+					(dma_addr_t)__virt_to_phys(page_address(page));})
 
 #define __arch_dma_to_virt(dev, addr)	({ (void *) (is_lbus_device(dev) ? \
 						lbus_to_virt(addr) : \
-						__bus_to_virt(addr)); })
+						__phys_to_virt(addr)); })
 
 #define __arch_virt_to_dma(dev, addr)	({ unsigned long __addr = (unsigned long)(addr); \
 					   (dma_addr_t) (is_lbus_device(dev) ? \
 						virt_to_lbus(__addr) : \
-						__virt_to_bus(__addr)); })
+						__virt_to_phys(__addr)); })
 
 #endif	/* CONFIG_ARCH_OMAP15XX */