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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
24extern void __init __iomem *early_ioremap(u64 phys_addr, unsigned long size);
25extern 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
32static 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#define ioremap_wc(offset, size) \
58 ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL_WUC))
59
60#define ioremap_cache(offset, size) \
61 ioremap_prot((offset), (size), pgprot_val(PAGE_KERNEL))
62
63#define mmiowb() asm volatile ("dbar 0" ::: "memory")
64
65/*
66 * String version of I/O memory access operations.
67 */
68extern void __memset_io(volatile void __iomem *dst, int c, size_t count);
69extern void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count);
70extern 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#include <asm-generic/io.h>
76
77#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
78extern int valid_phys_addr_range(phys_addr_t addr, size_t size);
79extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
80
81#endif /* _ASM_IO_H */