mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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bcd6a1c695
This patch allows for a more flexible ioremap() interception based on iotable contents. With this patch, the ioremap() interception code can properly translate addresses only after davinci_soc_info has been initialized. Consequently, in soc-specific init functions, davinci_common_init() has to happen before any ioremap() attempts. The da8xx init sequence has been suitably modified to meet this restriction. Signed-off-by: Cyril Chemparathy <cyril@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
49 lines
1.2 KiB
C
49 lines
1.2 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/io.h>
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#include <asm/tlb.h>
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#include <asm/mach/map.h>
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#include <mach/common.h>
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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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struct map_desc *desc = davinci_soc_info.io_desc;
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int desc_num = davinci_soc_info.io_desc_num;
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int i;
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for (i = 0; i < desc_num; i++, desc++) {
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unsigned long iophys = __pfn_to_phys(desc->pfn);
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unsigned long iosize = desc->length;
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if (p >= iophys && (p + size) <= (iophys + iosize))
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return __io(desc->virtual + p - iophys);
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}
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return __arm_ioremap_caller(p, size, type,
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__builtin_return_address(0));
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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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