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 extern void __init __iomem *early_ioremap(u64 phys_addr, unsigned long size);
18 extern void __init early_iounmap(void __iomem *addr, unsigned long size);
19
20 #define early_memremap early_ioremap
21 #define early_memunmap early_iounmap
22
23 #ifdef CONFIG_ARCH_IOREMAP
24
25 static inline void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size,
26 unsigned long prot_val)
27 {
28 switch (prot_val & _CACHE_MASK) {
29 case _CACHE_CC:
30 return (void __iomem *)(unsigned long)(CACHE_BASE + offset);
31 case _CACHE_SUC:
32 return (void __iomem *)(unsigned long)(UNCACHE_BASE + offset);
33 case _CACHE_WUC:
34 return (void __iomem *)(unsigned long)(WRITECOMBINE_BASE + offset);
35 default:
36 return NULL;
37 }
38 }
39
40 #define ioremap(offset, size) \
41 ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL_SUC))
42
43 #define iounmap(addr) ((void)(addr))
44
45 #endif
46
47 /*
48 * On LoongArch, ioremap() has two variants, ioremap_wc() and ioremap_cache().
49 * They map bus memory into CPU space, the mapped memory is marked uncachable
50 * (_CACHE_SUC), uncachable but accelerated by write-combine (_CACHE_WUC) and
51 * cachable (_CACHE_CC) respectively for CPU access.
52 *
53 * @offset: bus address of the memory
54 * @size: size of the resource to map
55 */
56 #define ioremap_wc(offset, size) \
57 ioremap_prot((offset), (size), \
58 pgprot_val(wc_enabled ? PAGE_KERNEL_WUC : PAGE_KERNEL_SUC))
59
60 #define ioremap_cache(offset, size) \
61 ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL))
62
63 #define mmiowb() wmb()
64
65 /*
66 * String version of I/O memory access operations.
67 */
68 extern void __memset_io(volatile void __iomem *dst, int c, size_t count);
69 extern void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count);
70 extern void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count);
71 #define memset_io(c, v, l) __memset_io((c), (v), (l))
72 #define memcpy_fromio(a, c, l) __memcpy_fromio((a), (c), (l))
73 #define memcpy_toio(c, a, l) __memcpy_toio((c), (a), (l))
74
75 #define __io_aw() mmiowb()
76
77 #ifdef CONFIG_KFENCE
78 #define virt_to_phys(kaddr) \
79 ({ \
80 (likely((unsigned long)kaddr < vm_map_base)) ? __pa((unsigned long)kaddr) : \
81 page_to_phys(tlb_virt_to_page((unsigned long)kaddr)) + offset_in_page((unsigned long)kaddr);\
82 })
83
84 #define phys_to_virt(paddr) \
85 ({ \
86 extern char *__kfence_pool; \
87 (unlikely(__kfence_pool == NULL)) ? __va((unsigned long)paddr) : \
88 page_address(phys_to_page((unsigned long)paddr)) + offset_in_page((unsigned long)paddr);\
89 })
90 #endif
91
92 #include <asm-generic/io.h>
93
94 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
95 extern int valid_phys_addr_range(phys_addr_t addr, size_t size);
96 extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
97
98 #endif /* _ASM_IO_H */
99
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