1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __GENERIC_IO_H
3 #define __GENERIC_IO_H
4 
5 #include <linux/linkage.h>
6 #include <asm/byteorder.h>
7 
8 /*
9  * These are the "generic" interfaces for doing new-style
10  * memory-mapped or PIO accesses. Architectures may do
11  * their own arch-optimized versions, these just act as
12  * wrappers around the old-style IO register access functions:
13  * read[bwl]/write[bwl]/in[bwl]/out[bwl]
14  *
15  * Don't include this directly, include it from <asm/io.h>.
16  */
17 
18 /*
19  * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
20  * access or a MMIO access, these functions don't care. The info is
21  * encoded in the hardware mapping set up by the mapping functions
22  * (or the cookie itself, depending on implementation and hw).
23  *
24  * The generic routines just encode the PIO/MMIO as part of the
25  * cookie, and coldly assume that the MMIO IO mappings are not
26  * in the low address range. Architectures for which this is not
27  * true can't use this generic implementation.
28  */
29 extern unsigned int ioread8(const void __iomem *);
30 extern unsigned int ioread16(const void __iomem *);
31 extern unsigned int ioread16be(const void __iomem *);
32 extern unsigned int ioread32(const void __iomem *);
33 extern unsigned int ioread32be(const void __iomem *);
34 #ifdef CONFIG_64BIT
35 extern u64 ioread64(const void __iomem *);
36 extern u64 ioread64be(const void __iomem *);
37 #endif
38 
39 #ifdef readq
40 #define ioread64_lo_hi ioread64_lo_hi
41 #define ioread64_hi_lo ioread64_hi_lo
42 #define ioread64be_lo_hi ioread64be_lo_hi
43 #define ioread64be_hi_lo ioread64be_hi_lo
44 extern u64 ioread64_lo_hi(const void __iomem *addr);
45 extern u64 ioread64_hi_lo(const void __iomem *addr);
46 extern u64 ioread64be_lo_hi(const void __iomem *addr);
47 extern u64 ioread64be_hi_lo(const void __iomem *addr);
48 #endif
49 
50 extern void iowrite8(u8, void __iomem *);
51 extern void iowrite16(u16, void __iomem *);
52 extern void iowrite16be(u16, void __iomem *);
53 extern void iowrite32(u32, void __iomem *);
54 extern void iowrite32be(u32, void __iomem *);
55 #ifdef CONFIG_64BIT
56 extern void iowrite64(u64, void __iomem *);
57 extern void iowrite64be(u64, void __iomem *);
58 #endif
59 
60 #ifdef writeq
61 #define iowrite64_lo_hi iowrite64_lo_hi
62 #define iowrite64_hi_lo iowrite64_hi_lo
63 #define iowrite64be_lo_hi iowrite64be_lo_hi
64 #define iowrite64be_hi_lo iowrite64be_hi_lo
65 extern void iowrite64_lo_hi(u64 val, void __iomem *addr);
66 extern void iowrite64_hi_lo(u64 val, void __iomem *addr);
67 extern void iowrite64be_lo_hi(u64 val, void __iomem *addr);
68 extern void iowrite64be_hi_lo(u64 val, void __iomem *addr);
69 #endif
70 
71 /*
72  * "string" versions of the above. Note that they
73  * use native byte ordering for the accesses (on
74  * the assumption that IO and memory agree on a
75  * byte order, and CPU byteorder is irrelevant).
76  *
77  * They do _not_ update the port address. If you
78  * want MMIO that copies stuff laid out in MMIO
79  * memory across multiple ports, use "memcpy_toio()"
80  * and friends.
81  */
82 extern void ioread8_rep(const void __iomem *port, void *buf, unsigned long count);
83 extern void ioread16_rep(const void __iomem *port, void *buf, unsigned long count);
84 extern void ioread32_rep(const void __iomem *port, void *buf, unsigned long count);
85 
86 extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
87 extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
88 extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
89 
90 #ifdef CONFIG_HAS_IOPORT_MAP
91 /* Create a virtual mapping cookie for an IO port range */
92 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
93 extern void ioport_unmap(void __iomem *);
94 #endif
95 
96 #ifndef ARCH_HAS_IOREMAP_WC
97 #define ioremap_wc ioremap
98 #endif
99 
100 #ifndef ARCH_HAS_IOREMAP_WT
101 #define ioremap_wt ioremap
102 #endif
103 
104 #ifndef ARCH_HAS_IOREMAP_NP
105 /* See the comment in asm-generic/io.h about ioremap_np(). */
106 #define ioremap_np ioremap_np
ioremap_np(phys_addr_t offset,size_t size)107 static inline void __iomem *ioremap_np(phys_addr_t offset, size_t size)
108 {
109 	return NULL;
110 }
111 #endif
112 
113 #include <asm-generic/pci_iomap.h>
114 
115 #endif
116