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(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 *); 34 #ifdef CONFIG_64BIT 35 extern u64 ioread64(void __iomem *); 36 extern u64 ioread64be(void __iomem *); 37 #endif 38 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 *); 44 #ifdef CONFIG_64BIT 45 extern void iowrite64(u64, void __iomem *); 46 extern void iowrite64be(u64, void __iomem *); 47 #endif 48 49 /* 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). 54 * 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()" 58 * and friends. 59 */ 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); 63 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); 67 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 *); 72 #endif 73 74 #ifndef ARCH_HAS_IOREMAP_WC 75 #define ioremap_wc ioremap_nocache 76 #endif 77 78 #ifndef ARCH_HAS_IOREMAP_WT 79 #define ioremap_wt ioremap_nocache 80 #endif 81 82 #ifdef CONFIG_PCI 83 /* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */ 84 struct pci_dev; 85 extern void pci_iounmap(struct pci_dev *dev, void __iomem *); 86 #elif defined(CONFIG_GENERIC_IOMAP) 87 struct pci_dev; 88 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) 89 { } 90 #endif 91 92 #include <asm-generic/pci_iomap.h> 93 94 #endif 95