1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #ifndef _ASM_IO_H 6 #define _ASM_IO_H 7 8 #define ARCH_HAS_IOREMAP_WC 9 10 #include <linux/kernel.h> 11 #include <linux/types.h> 12 13 #include <asm/addrspace.h> 14 #include <asm/cpu.h> 15 #include <asm/page.h> 16 #include <asm/pgtable-bits.h> 17 #include <asm/string.h> 18 19 /* 20 * Change "struct page" to physical address. 21 */ 22 #define page_to_phys(page) ((phys_addr_t)page_to_pfn(page) << PAGE_SHIFT) 23 24 extern void __init __iomem *early_ioremap(u64 phys_addr, unsigned long size); 25 extern void __init early_iounmap(void __iomem *addr, unsigned long size); 26 27 #define early_memremap early_ioremap 28 #define early_memunmap early_iounmap 29 30 #ifdef CONFIG_ARCH_IOREMAP 31 32 static inline void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size, 33 unsigned long prot_val) 34 { 35 if (prot_val & _CACHE_CC) 36 return (void __iomem *)(unsigned long)(CACHE_BASE + offset); 37 else 38 return (void __iomem *)(unsigned long)(UNCACHE_BASE + offset); 39 } 40 41 #define ioremap(offset, size) \ 42 ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL_SUC)) 43 44 #define iounmap(addr) ((void)(addr)) 45 46 #endif 47 48 /* 49 * On LoongArch, ioremap() has two variants, ioremap_wc() and ioremap_cache(). 50 * They map bus memory into CPU space, the mapped memory is marked uncachable 51 * (_CACHE_SUC), uncachable but accelerated by write-combine (_CACHE_WUC) and 52 * cachable (_CACHE_CC) respectively for CPU access. 53 * 54 * @offset: bus address of the memory 55 * @size: size of the resource to map 56 */ 57 extern pgprot_t pgprot_wc; 58 59 #define ioremap_wc(offset, size) \ 60 ioremap_prot((offset), (size), pgprot_val(pgprot_wc)) 61 62 #define ioremap_cache(offset, size) \ 63 ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL)) 64 65 #define mmiowb() asm volatile ("dbar 0" ::: "memory") 66 67 /* 68 * String version of I/O memory access operations. 69 */ 70 extern void __memset_io(volatile void __iomem *dst, int c, size_t count); 71 extern void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count); 72 extern void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count); 73 #define memset_io(c, v, l) __memset_io((c), (v), (l)) 74 #define memcpy_fromio(a, c, l) __memcpy_fromio((a), (c), (l)) 75 #define memcpy_toio(c, a, l) __memcpy_toio((c), (a), (l)) 76 77 #include <asm-generic/io.h> 78 79 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE 80 extern int valid_phys_addr_range(phys_addr_t addr, size_t size); 81 extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); 82 83 #endif /* _ASM_IO_H */ 84