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 ioremap_wc
97 #define ioremap_wc ioremap
98 #endif
99
100 #ifndef ioremap_wt
101 #define ioremap_wt ioremap
102 #endif
103
104 #ifndef 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
