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(phys_addr_t 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
ioremap_prot(phys_addr_t offset,unsigned long size,pgprot_t prot)25 static inline void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size,
26 pgprot_t prot)
27 {
28 if (offset > TO_PHYS_MASK)
29 return NULL;
30
31 switch (pgprot_val(prot) & _CACHE_MASK) {
32 case _CACHE_CC:
33 return (void __iomem *)(unsigned long)(CACHE_BASE + offset);
34 case _CACHE_SUC:
35 return (void __iomem *)(unsigned long)(UNCACHE_BASE + offset);
36 case _CACHE_WUC:
37 return (void __iomem *)(unsigned long)(WRITECOMBINE_BASE + offset);
38 default:
39 return NULL;
40 }
41 }
42
43 #define ioremap(offset, size) \
44 ioremap_prot((offset), (size), PAGE_KERNEL_SUC)
45
46 #define iounmap(addr) ((void)(addr))
47
48 #endif
49
50 /*
51 * On LoongArch, ioremap() has two variants, ioremap_wc() and ioremap_cache().
52 * They map bus memory into CPU space, the mapped memory is marked uncachable
53 * (_CACHE_SUC), uncachable but accelerated by write-combine (_CACHE_WUC) and
54 * cachable (_CACHE_CC) respectively for CPU access.
55 *
56 * @offset: bus address of the memory
57 * @size: size of the resource to map
58 */
59 #define ioremap_wc(offset, size) \
60 ioremap_prot((offset), (size), \
61 wc_enabled ? PAGE_KERNEL_WUC : PAGE_KERNEL_SUC)
62
63 #define ioremap_cache(offset, size) \
64 ioremap_prot((offset), (size), PAGE_KERNEL)
65
66 #define mmiowb() wmb()
67
68 #define __io_aw() mmiowb()
69
70 #ifdef CONFIG_KFENCE
71 #define virt_to_phys(kaddr) \
72 ({ \
73 (likely((unsigned long)kaddr < vm_map_base)) ? __pa((unsigned long)kaddr) : \
74 page_to_phys(tlb_virt_to_page((unsigned long)kaddr)) + offset_in_page((unsigned long)kaddr);\
75 })
76
77 #define phys_to_virt(paddr) \
78 ({ \
79 extern char *__kfence_pool; \
80 (unlikely(__kfence_pool == NULL)) ? __va((unsigned long)paddr) : \
81 page_address(phys_to_page((unsigned long)paddr)) + offset_in_page((unsigned long)paddr);\
82 })
83 #endif
84
85 #include <asm-generic/io.h>
86
87 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
88 extern int valid_phys_addr_range(phys_addr_t addr, size_t size);
89 extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
90
91 #endif /* _ASM_IO_H */
92