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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