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
9/*
10 * I/O memory access primitives. Reads are ordered relative to any
11 * following Normal memory access. Writes are ordered relative to any prior
12 * Normal memory access.
13 *
14 * For CACHEV1 (807, 810), store instruction could fast retire, so we need
15 * another mb() to prevent st fast retire.
16 *
17 * For CACHEV2 (860), store instruction with PAGE_ATTR_NO_BUFFERABLE won't
18 * fast retire.
19 */
20#define readb(c)		({ u8  __v = readb_relaxed(c); rmb(); __v; })
21#define readw(c)		({ u16 __v = readw_relaxed(c); rmb(); __v; })
22#define readl(c)		({ u32 __v = readl_relaxed(c); rmb(); __v; })
23
24#ifdef CONFIG_CPU_HAS_CACHEV2
25#define writeb(v,c)		({ wmb(); writeb_relaxed((v),(c)); })
26#define writew(v,c)		({ wmb(); writew_relaxed((v),(c)); })
27#define writel(v,c)		({ wmb(); writel_relaxed((v),(c)); })
28#else
29#define writeb(v,c)		({ wmb(); writeb_relaxed((v),(c)); mb(); })
30#define writew(v,c)		({ wmb(); writew_relaxed((v),(c)); mb(); })
31#define writel(v,c)		({ wmb(); writel_relaxed((v),(c)); mb(); })
32#endif
33
34/*
35 * String version of I/O memory access operations.
36 */
37extern void __memcpy_fromio(void *, const volatile void __iomem *, size_t);
38extern void __memcpy_toio(volatile void __iomem *, const void *, size_t);
39extern void __memset_io(volatile void __iomem *, int, size_t);
40
41#define memset_io(c,v,l)        __memset_io((c),(v),(l))
42#define memcpy_fromio(a,c,l)    __memcpy_fromio((a),(c),(l))
43#define memcpy_toio(c,a,l)      __memcpy_toio((c),(a),(l))
44
45/*
46 * I/O memory mapping functions.
47 */
48#define ioremap_wc(addr, size) \
49	ioremap_prot((addr), (size), \
50		(_PAGE_IOREMAP & ~_CACHE_MASK) | _CACHE_UNCACHED)
51
52#include <asm-generic/io.h>
53
54#endif /* __ASM_CSKY_IO_H */
55