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