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 */
37 extern void __memcpy_fromio(void *, const volatile void __iomem *, size_t);
38 extern void __memcpy_toio(volatile void __iomem *, const void *, size_t);
39 extern 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
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