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/* 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 <asm/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. */ extern void __iomem *ioremap_cache(phys_addr_t addr, size_t size); extern void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot); extern void iounmap(void *addr); #define ioremap(addr, size) __ioremap((addr), (size), pgprot_noncached(PAGE_KERNEL)) #define ioremap_wc(addr, size) __ioremap((addr), (size), pgprot_writecombine(PAGE_KERNEL)) #define ioremap_nocache(addr, size) ioremap((addr), (size)) #define ioremap_cache ioremap_cache #include <asm-generic/io.h> #endif /* __ASM_CSKY_IO_H */
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