io.h (1807B)
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 */