2 * include/asm-arm/arch-ixp23xx/memory.h
4 * Copyright (c) 2003-2004 Intel Corp.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
12 #ifndef __ASM_ARCH_MEMORY_H
13 #define __ASM_ARCH_MEMORY_H
15 #include <asm/hardware.h>
18 * Physical DRAM offset.
20 #define PHYS_OFFSET (0x00000000)
24 * Virtual view <-> DMA view memory address translations
25 * virt_to_bus: Used to translate the virtual address to an
26 * address suitable to be passed to set_dma_addr
27 * bus_to_virt: Used to convert an address for DMA operations
28 * to an address that the kernel can use.
31 #include <asm/mach-types.h>
33 #define __virt_to_bus(v) \
34 ({ unsigned int ret; \
35 ret = ((__virt_to_phys(v) - 0x00000000) + \
36 (*((volatile int *)IXP23XX_PCI_SDRAM_BAR) & 0xfffffff0)); \
39 #define __bus_to_virt(b) \
40 ({ unsigned int data; \
41 data = *((volatile int *)IXP23XX_PCI_SDRAM_BAR); \
42 __phys_to_virt((((b - (data & 0xfffffff0)) + 0x00000000))); })
45 * Coherency support. Only supported on A2 CPUs or on A1
46 * systems that have the cache coherency workaround.
48 static inline int __ixp23xx_arch_is_coherent(void)
50 extern unsigned int processor_id;
52 if (((processor_id & 15) >= 4) || machine_is_roadrunner())
58 #define arch_is_coherent() __ixp23xx_arch_is_coherent()