forked from mirrors/linux
5336c17928
Implement the following apis to meet usage in different scenarios. - ioremap (NonCache + StrongOrder) - ioremap_nocache (NonCache + StrongOrder) - ioremap_wc (NonCache + WeakOrder ) - ioremap_cache ( Cache + WeakOrder ) Also change flag VM_ALLOC to VM_IOREMAP in get_vm_area_caller. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christoph Hellwig <hch@infradead.org>
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_IO_H
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#define __ASM_CSKY_IO_H
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#include <asm/pgtable.h>
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#include <linux/types.h>
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#include <linux/version.h>
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/*
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* I/O memory access primitives. Reads are ordered relative to any
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* following Normal memory access. Writes are ordered relative to any prior
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* Normal memory access.
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*
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* For CACHEV1 (807, 810), store instruction could fast retire, so we need
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* another mb() to prevent st fast retire.
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*
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* For CACHEV2 (860), store instruction with PAGE_ATTR_NO_BUFFERABLE won't
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* fast retire.
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*/
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#define readb(c) ({ u8 __v = readb_relaxed(c); rmb(); __v; })
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#define readw(c) ({ u16 __v = readw_relaxed(c); rmb(); __v; })
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#define readl(c) ({ u32 __v = readl_relaxed(c); rmb(); __v; })
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#ifdef CONFIG_CPU_HAS_CACHEV2
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#define writeb(v,c) ({ wmb(); writeb_relaxed((v),(c)); })
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#define writew(v,c) ({ wmb(); writew_relaxed((v),(c)); })
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#define writel(v,c) ({ wmb(); writel_relaxed((v),(c)); })
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#else
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#define writeb(v,c) ({ wmb(); writeb_relaxed((v),(c)); mb(); })
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#define writew(v,c) ({ wmb(); writew_relaxed((v),(c)); mb(); })
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#define writel(v,c) ({ wmb(); writel_relaxed((v),(c)); mb(); })
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#endif
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/*
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* I/O memory mapping functions.
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*/
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extern void __iomem *ioremap_cache(phys_addr_t addr, size_t size);
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extern void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot);
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extern void iounmap(void *addr);
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#define ioremap(addr, size) __ioremap((addr), (size), pgprot_noncached(PAGE_KERNEL))
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#define ioremap_wc(addr, size) __ioremap((addr), (size), pgprot_writecombine(PAGE_KERNEL))
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#define ioremap_nocache(addr, size) ioremap((addr), (size))
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#define ioremap_cache ioremap_cache
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#include <asm-generic/io.h>
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#endif /* __ASM_CSKY_IO_H */
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