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ca9d3ab5 SK |
1 | /* |
2 | * (C) Copyright 2011, Julius Baxter <julius@opencores.org> | |
3 | * | |
1a459660 | 4 | * SPDX-License-Identifier: GPL-2.0+ |
ca9d3ab5 SK |
5 | */ |
6 | ||
7 | #ifndef __ASM_OPENRISC_IO_H | |
8 | #define __ASM_OPENRISC_IO_H | |
9 | ||
10 | /* | |
11 | * Given a physical address and a length, return a virtual address | |
12 | * that can be used to access the memory range with the caching | |
13 | * properties specified by "flags". | |
14 | */ | |
15 | #define MAP_NOCACHE (0) | |
16 | #define MAP_WRCOMBINE (0) | |
17 | #define MAP_WRBACK (0) | |
18 | #define MAP_WRTHROUGH (0) | |
19 | ||
20 | static inline void * | |
21 | map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags) | |
22 | { | |
23 | return (void *)paddr; | |
24 | } | |
25 | ||
26 | /* | |
27 | * Take down a mapping set up by map_physmem(). | |
28 | */ | |
29 | static inline void unmap_physmem(void *vaddr, unsigned long flags) | |
30 | { | |
31 | ||
32 | } | |
33 | ||
34 | /* | |
35 | * Change virtual addresses to physical addresses | |
36 | */ | |
37 | static inline phys_addr_t virt_to_phys(void *vaddr) | |
38 | { | |
39 | return (phys_addr_t)(vaddr); | |
40 | } | |
41 | ||
42 | ||
43 | /* | |
44 | * readX/writeX() are used to access memory mapped devices. On some | |
45 | * architectures the memory mapped IO stuff needs to be accessed | |
46 | * differently. On the openrisc architecture, we just read/write the | |
47 | * memory location directly. | |
48 | */ | |
49 | #define readb(addr) (*(volatile unsigned char *) (addr)) | |
50 | #define readw(addr) (*(volatile unsigned short *) (addr)) | |
51 | #define readl(addr) (*(volatile unsigned int *) (addr)) | |
52 | #define __raw_readb readb | |
53 | #define __raw_readw readw | |
54 | #define __raw_readl readl | |
55 | ||
56 | #define writeb(b, addr) ((*(volatile unsigned char *) (addr)) = (b)) | |
57 | #define writew(b, addr) ((*(volatile unsigned short *) (addr)) = (b)) | |
58 | #define writel(b, addr) ((*(volatile unsigned int *) (addr)) = (b)) | |
59 | #define __raw_writeb writeb | |
60 | #define __raw_writew writew | |
61 | #define __raw_writel writel | |
62 | ||
63 | #define memset_io(a, b, c) memset((void *)(a), (b), (c)) | |
64 | #define memcpy_fromio(a, b, c) memcpy((a), (void *)(b), (c)) | |
65 | #define memcpy_toio(a, b, c) memcpy((void *)(a), (b), (c)) | |
66 | ||
67 | /* | |
68 | * Again, OpenRISC does not require mem IO specific function. | |
69 | */ | |
70 | ||
71 | ||
72 | #define IO_BASE 0x0 | |
73 | #define IO_SPACE_LIMIT 0xffffffff | |
74 | ||
75 | #define inb(port) readb((port + IO_BASE)) | |
76 | #define outb(value, port) writeb((value), (port + IO_BASE)) | |
77 | #define inb_p(port) inb((port)) | |
78 | #define outb_p(value, port) outb((value), (port)) | |
79 | ||
80 | /* | |
81 | * Convert a physical pointer to a virtual kernel pointer for /dev/mem | |
82 | * access | |
83 | */ | |
84 | #define xlate_dev_mem_ptr(p) __va(p) | |
85 | ||
86 | /* | |
87 | * Convert a virtual cached pointer to an uncached pointer | |
88 | */ | |
89 | #define xlate_dev_kmem_ptr(p) p | |
90 | ||
91 | #define ioread8(addr) readb(addr) | |
92 | #define ioread16(addr) readw(addr) | |
93 | #define ioread32(addr) readl(addr) | |
94 | ||
95 | #define iowrite8(v, addr) writeb((v), (addr)) | |
96 | #define iowrite16(v, addr) writew((v), (addr)) | |
97 | #define iowrite32(v, addr) writel((v), (addr)) | |
98 | ||
99 | #endif |