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96354ad79e
For I/O access, 810/807 store instruction fast retire will cause wrong primitive. For example: stw (clear interrupt source) stw (unmask interrupt controller) enable interrupt stw is fast retire instruction. When PC is run at enable interrupt stage, the clear interrupt source hasn't finished. It will cause another wrong irq-enter. So use mb() to prevent above. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Lu Baoquan <lu.baoquan@intellif.com>
50 lines
1.6 KiB
C
50 lines
1.6 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 <abi/pgtable-bits.h>
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#include <linux/types.h>
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#include <linux/version.h>
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extern void __iomem *ioremap(phys_addr_t offset, size_t size);
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extern void iounmap(void *addr);
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extern int remap_area_pages(unsigned long address, phys_addr_t phys_addr,
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size_t size, unsigned long flags);
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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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#define ioremap_nocache(phy, sz) ioremap(phy, sz)
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#define ioremap_wc ioremap_nocache
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#define ioremap_wt ioremap_nocache
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#include <asm-generic/io.h>
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#endif /* __ASM_CSKY_IO_H */
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