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