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Tom Rini83d290c2018-05-06 17:58:06 -04001/* SPDX-License-Identifier: GPL-2.0+ */
Chris Zankelc978b522016-08-10 18:36:44 +03002/*
3 * IO header file
4 *
5 * Copyright (C) 2001-2007 Tensilica Inc.
6 * Based on the Linux/Xtensa version of this header.
Chris Zankelc978b522016-08-10 18:36:44 +03007 */
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
20static inline unsigned short _swapw(unsigned short v)
21{
22 return (v << 8) | (v >> 8);
23}
24
25static 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
73void insb(unsigned long port, void *dst, unsigned long count);
74void insw(unsigned long port, void *dst, unsigned long count);
75void insl(unsigned long port, void *dst, unsigned long count);
76void outsb(unsigned long port, const void *src, unsigned long count);
77void outsw(unsigned long port, const void *src, unsigned long count);
78void 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
Chris Zankelc978b522016-08-10 18:36:44 +0300117/*
118 * Dummy function to keep U-Boot's cfi_flash.c driver happy.
119 */
120static inline void sync(void)
121{
122}
123
Paul Burtone8645522017-09-14 15:05:09 -0700124#include <asm-generic/io.h>
125
Chris Zankelc978b522016-08-10 18:36:44 +0300126#endif /* _XTENSA_IO_H */