76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/*
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* linux/arch/unicore32/include/asm/io.h
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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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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#ifndef __UNICORE_IO_H__
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#define __UNICORE_IO_H__
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#ifdef __KERNEL__
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#include <asm/byteorder.h>
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#include <asm/memory.h>
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#define PCI_IOBASE PKUNITY_PCILIO_BASE
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#include <asm-generic/io.h>
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/*
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* __uc32_ioremap and __uc32_ioremap_cached takes CPU physical address.
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*/
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extern void __iomem *__uc32_ioremap(unsigned long, size_t);
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extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t);
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extern void __uc32_iounmap(volatile void __iomem *addr);
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/*
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* ioremap and friends.
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*
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* ioremap takes a PCI memory address, as specified in
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* Documentation/io-mapping.txt.
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*
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*/
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#define ioremap(cookie, size) __uc32_ioremap(cookie, size)
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#define ioremap_cached(cookie, size) __uc32_ioremap_cached(cookie, size)
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#define ioremap_nocache(cookie, size) __uc32_ioremap(cookie, size)
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#define iounmap(cookie) __uc32_iounmap(cookie)
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#define readb_relaxed readb
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#define readw_relaxed readw
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#define readl_relaxed readl
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#define HAVE_ARCH_PIO_SIZE
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#define PIO_OFFSET (unsigned int)(PCI_IOBASE)
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#define PIO_MASK (unsigned int)(IO_SPACE_LIMIT)
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#define PIO_RESERVED (PIO_OFFSET + PIO_MASK + 1)
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#ifdef CONFIG_STRICT_DEVMEM
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#include <linux/ioport.h>
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#include <linux/mm.h>
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/*
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* devmem_is_allowed() checks to see if /dev/mem access to a certain
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* address is valid. The argument is a physical page number.
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* We mimic x86 here by disallowing access to system RAM as well as
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* device-exclusive MMIO regions. This effectively disable read()/write()
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* on /dev/mem.
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*/
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static inline int devmem_is_allowed(unsigned long pfn)
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{
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if (iomem_is_exclusive(pfn << PAGE_SHIFT))
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return 0;
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if (!page_is_ram(pfn))
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return 1;
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return 0;
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}
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#endif /* CONFIG_STRICT_DEVMEM */
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#endif /* __KERNEL__ */
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#endif /* __UNICORE_IO_H__ */
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