/* SPDX-License-Identifier: GPL-2.0 */ // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #ifndef __ASM_CSKY_IO_H #define __ASM_CSKY_IO_H #include <linux/pgtable.h> #include <linux/types.h> #include <linux/version.h> /* * I/O memory access primitives. Reads are ordered relative to any * following Normal memory access. Writes are ordered relative to any prior * Normal memory access. * * For CACHEV1 (807, 810), store instruction could fast retire, so we need * another mb() to prevent st fast retire. * * For CACHEV2 (860), store instruction with PAGE_ATTR_NO_BUFFERABLE won't * fast retire. */ #define readb(c) ({ u8 __v = readb_relaxed(c); rmb(); __v; }) #define readw(c) ({ u16 __v = readw_relaxed(c); rmb(); __v; }) #define readl(c) ({ u32 __v = readl_relaxed(c); rmb(); __v; }) #ifdef CONFIG_CPU_HAS_CACHEV2 #define writeb(v,c) ({ wmb(); writeb_relaxed((v),(c)); }) #define writew(v,c) ({ wmb(); writew_relaxed((v),(c)); }) #define writel(v,c) ({ wmb(); writel_relaxed((v),(c)); }) #else #define writeb(v,c) ({ wmb(); writeb_relaxed((v),(c)); mb(); }) #define writew(v,c) ({ wmb(); writew_relaxed((v),(c)); mb(); }) #define writel(v,c) ({ wmb(); writel_relaxed((v),(c)); mb(); }) #endif /* * I/O memory mapping functions. */ #define ioremap_wc(addr, size) \ ioremap_prot((addr), (size), \ (_PAGE_IOREMAP & ~_CACHE_MASK) | _CACHE_UNCACHED) #include <asm-generic/io.h> #endif /* __ASM_CSKY_IO_H */