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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef __ASM_CSKY_IO_H
4#define __ASM_CSKY_IO_H
5
6#include <linux/pgtable.h>
7#include <linux/types.h>
8#include <linux/version.h>
9
10/*
11 * I/O memory access primitives. Reads are ordered relative to any
12 * following Normal memory access. Writes are ordered relative to any prior
13 * Normal memory access.
14 *
15 * For CACHEV1 (807, 810), store instruction could fast retire, so we need
16 * another mb() to prevent st fast retire.
17 *
18 * For CACHEV2 (860), store instruction with PAGE_ATTR_NO_BUFFERABLE won't
19 * fast retire.
20 */
21#define readb(c) ({ u8 __v = readb_relaxed(c); rmb(); __v; })
22#define readw(c) ({ u16 __v = readw_relaxed(c); rmb(); __v; })
23#define readl(c) ({ u32 __v = readl_relaxed(c); rmb(); __v; })
24
25#ifdef CONFIG_CPU_HAS_CACHEV2
26#define writeb(v,c) ({ wmb(); writeb_relaxed((v),(c)); })
27#define writew(v,c) ({ wmb(); writew_relaxed((v),(c)); })
28#define writel(v,c) ({ wmb(); writel_relaxed((v),(c)); })
29#else
30#define writeb(v,c) ({ wmb(); writeb_relaxed((v),(c)); mb(); })
31#define writew(v,c) ({ wmb(); writew_relaxed((v),(c)); mb(); })
32#define writel(v,c) ({ wmb(); writel_relaxed((v),(c)); mb(); })
33#endif
34
35/*
36 * I/O memory mapping functions.
37 */
38#define ioremap_wc(addr, size) \
39 ioremap_prot((addr), (size), \
40 (_PAGE_IOREMAP & ~_CACHE_MASK) | _CACHE_UNCACHED)
41
42#include <asm-generic/io.h>
43
44#endif /* __ASM_CSKY_IO_H */