1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * IO header file
4 *
5 * Copyright (C) 2001-2007 Tensilica Inc.
6 * Based on the Linux/Xtensa version of this header.
7 */
8
9 #ifndef _XTENSA_IO_H
10 #define _XTENSA_IO_H
11
12 #include <linux/types.h>
13 #include <asm/byteorder.h>
14
15 /*
16 * swap functions to change byte order from little-endian to big-endian and
17 * vice versa.
18 */
19
_swapw(unsigned short v)20 static inline unsigned short _swapw(unsigned short v)
21 {
22 return (v << 8) | (v >> 8);
23 }
24
_swapl(unsigned int v)25 static inline unsigned int _swapl(unsigned int v)
26 {
27 return (v << 24) | ((v & 0xff00) << 8) |
28 ((v >> 8) & 0xff00) | (v >> 24);
29 }
30
31 /*
32 * Generic I/O
33 */
34
35 #define readb(addr) \
36 ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
37 #define readw(addr) \
38 ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
39 #define readl(addr) \
40 ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
41 #define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
42 #define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
43 #define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
44
45 #define __raw_readb readb
46 #define __raw_readw readw
47 #define __raw_readl readl
48 #define __raw_writeb writeb
49 #define __raw_writew writew
50 #define __raw_writel writel
51
52 /* These are the definitions for the x86 IO instructions
53 * inb/inw/inl/outb/outw/outl, the "string" versions
54 * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
55 * inb_p/inw_p/...
56 * The macros don't do byte-swapping.
57 */
58
59 #define inb(port) readb((u8 *)((port)))
60 #define outb(val, port) writeb((val), (u8 *)((unsigned long)(port)))
61 #define inw(port) readw((u16 *)((port)))
62 #define outw(val, port) writew((val), (u16 *)((unsigned long)(port)))
63 #define inl(port) readl((u32 *)((port)))
64 #define outl(val, port) writel((val), (u32 *)((unsigned long)(port)))
65
66 #define inb_p(port) inb((port))
67 #define outb_p(val, port) outb((val), (port))
68 #define inw_p(port) inw((port))
69 #define outw_p(val, port) outw((val), (port))
70 #define inl_p(port) inl((port))
71 #define outl_p(val, port) outl((val), (port))
72
73 void insb(unsigned long port, void *dst, unsigned long count);
74 void insw(unsigned long port, void *dst, unsigned long count);
75 void insl(unsigned long port, void *dst, unsigned long count);
76 void outsb(unsigned long port, const void *src, unsigned long count);
77 void outsw(unsigned long port, const void *src, unsigned long count);
78 void outsl(unsigned long port, const void *src, unsigned long count);
79
80 #define IO_SPACE_LIMIT ~0
81
82 #define memset_io(a, b, c) memset((void *)(a), (b), (c))
83 #define memcpy_fromio(a, b, c) memcpy((a), (void *)(b), (c))
84 #define memcpy_toio(a, b, c) memcpy((void *)(a), (b), (c))
85
86 /* At this point the Xtensa doesn't provide byte swap instructions */
87
88 #ifdef __XTENSA_EB__
89 # define in_8(addr) (*(u8 *)(addr))
90 # define in_le16(addr) _swapw(*(u16 *)(addr))
91 # define in_le32(addr) _swapl(*(u32 *)(addr))
92 # define out_8(b, addr) *(u8 *)(addr) = (b)
93 # define out_le16(b, addr) *(u16 *)(addr) = _swapw(b)
94 # define out_le32(b, addr) *(u32 *)(addr) = _swapl(b)
95 #elif defined(__XTENSA_EL__)
96 # define in_8(addr) (*(u8 *)(addr))
97 # define in_le16(addr) (*(u16 *)(addr))
98 # define in_le32(addr) (*(u32 *)(addr))
99 # define out_8(b, addr) *(u8 *)(addr) = (b)
100 # define out_le16(b, addr) *(u16 *)(addr) = (b)
101 # define out_le32(b, addr) *(u32 *)(addr) = (b)
102 #else
103 # error processor byte order undefined!
104 #endif
105
106
107 /*
108 * Convert a physical pointer to a virtual kernel pointer for /dev/mem access
109 */
110 #define xlate_dev_mem_ptr(p) __va(p)
111
112 /*
113 * Convert a virtual cached pointer to an uncached pointer
114 */
115 #define xlate_dev_kmem_ptr(p) p
116
117 /*
118 * Dummy function to keep U-Boot's cfi_flash.c driver happy.
119 */
sync(void)120 static inline void sync(void)
121 {
122 }
123
124 #include <asm-generic/io.h>
125
126 #endif /* _XTENSA_IO_H */
127