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 #ifdef CONFIG_PCI 105 /* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */ 106 struct pci_dev; 107 extern void pci_iounmap(struct pci_dev *dev, void __iomem *); 108 #elif defined(CONFIG_GENERIC_IOMAP) 109 struct pci_dev; 110 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) 111 { } 112 #endif 113 114 #include <asm-generic/pci_iomap.h> 115 116 #endif 117