f5c122da54
Add arch-specific ioremap() which uses any existing static mappings in place of doing a new mapping. From now on, drivers should always use ioremap() instead of IO_ADDRESS(). In addition, remove the davinci_[read|write]* macros in favor of using ioremap. Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
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* DaVinci I/O mapping code
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*
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* Copyright (C) 2005-2006 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <asm/tlb.h>
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#include <asm/memory.h>
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#include <asm/mach/map.h>
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#include <mach/clock.h>
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extern void davinci_check_revision(void);
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/*
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* The machine specific code may provide the extra mapping besides the
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* default mapping provided here.
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*/
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static struct map_desc davinci_io_desc[] __initdata = {
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{
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.virtual = IO_VIRT,
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.pfn = __phys_to_pfn(IO_PHYS),
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.length = IO_SIZE,
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.type = MT_DEVICE
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},
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};
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void __init davinci_map_common_io(void)
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{
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iotable_init(davinci_io_desc, ARRAY_SIZE(davinci_io_desc));
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/* Normally devicemaps_init() would flush caches and tlb after
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* mdesc->map_io(), but we must also do it here because of the CPU
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* revision check below.
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*/
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local_flush_tlb_all();
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flush_cache_all();
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/* We want to check CPU revision early for cpu_is_xxxx() macros.
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* IO space mapping must be initialized before we can do that.
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*/
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davinci_check_revision();
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}
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#define BETWEEN(p, st, sz) ((p) >= (st) && (p) < ((st) + (sz)))
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#define XLATE(p, pst, vst) ((void __iomem *)((p) - (pst) + (vst)))
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/*
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* Intercept ioremap() requests for addresses in our fixed mapping regions.
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*/
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void __iomem *davinci_ioremap(unsigned long p, size_t size, unsigned int type)
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{
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if (BETWEEN(p, IO_PHYS, IO_SIZE))
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return XLATE(p, IO_PHYS, IO_VIRT);
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return __arm_ioremap(p, size, type);
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}
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EXPORT_SYMBOL(davinci_ioremap);
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void davinci_iounmap(volatile void __iomem *addr)
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{
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unsigned long virt = (unsigned long)addr;
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if (virt >= VMALLOC_START && virt < VMALLOC_END)
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__iounmap(addr);
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}
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EXPORT_SYMBOL(davinci_iounmap);
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