1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/linkage.h>
6 #include <asm/byteorder.h>
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]
15 * Don't include this directly, include it from <asm/io.h>.
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).
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.
29 extern unsigned int ioread8(void __iomem *);
30 extern unsigned int ioread16(void __iomem *);
31 extern unsigned int ioread16be(void __iomem *);
32 extern unsigned int ioread32(void __iomem *);
33 extern unsigned int ioread32be(void __iomem *);
35 extern u64 ioread64(void __iomem *);
36 extern u64 ioread64be(void __iomem *);
39 extern void iowrite8(u8, void __iomem *);
40 extern void iowrite16(u16, void __iomem *);
41 extern void iowrite16be(u16, void __iomem *);
42 extern void iowrite32(u32, void __iomem *);
43 extern void iowrite32be(u32, void __iomem *);
45 extern void iowrite64(u64, void __iomem *);
46 extern void iowrite64be(u64, void __iomem *);
50 * "string" versions of the above. Note that they
51 * use native byte ordering for the accesses (on
52 * the assumption that IO and memory agree on a
53 * byte order, and CPU byteorder is irrelevant).
55 * They do _not_ update the port address. If you
56 * want MMIO that copies stuff laid out in MMIO
57 * memory across multiple ports, use "memcpy_toio()"
60 extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count);
61 extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count);
62 extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count);
64 extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
65 extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
66 extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
68 #ifdef CONFIG_HAS_IOPORT_MAP
69 /* Create a virtual mapping cookie for an IO port range */
70 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
71 extern void ioport_unmap(void __iomem *);
74 #ifndef ARCH_HAS_IOREMAP_WC
75 #define ioremap_wc ioremap_nocache
78 #ifndef ARCH_HAS_IOREMAP_WT
79 #define ioremap_wt ioremap_nocache
83 /* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */
85 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
86 #elif defined(CONFIG_GENERIC_IOMAP)
88 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
92 #include <asm-generic/pci_iomap.h>