1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Based on arch/arm/include/asm/io.h 4 * 5 * Copyright (C) 1996-2000 Russell King 6 * Copyright (C) 2012 ARM Ltd. 7 */ 8 #ifndef __ASM_IO_H 9 #define __ASM_IO_H 10 11 #include <linux/types.h> 12 #include <linux/pgtable.h> 13 14 #include <asm/byteorder.h> 15 #include <asm/barrier.h> 16 #include <asm/memory.h> 17 #include <asm/early_ioremap.h> 18 #include <asm/alternative.h> 19 #include <asm/cpufeature.h> 20 21 /* 22 * Generic IO read/write. These perform native-endian accesses. 23 */ 24 #define __raw_writeb __raw_writeb 25 static inline void __raw_writeb(u8 val, volatile void __iomem *addr) 26 { 27 asm volatile("strb %w0, [%1]" : : "rZ" (val), "r" (addr)); 28 } 29 30 #define __raw_writew __raw_writew 31 static inline void __raw_writew(u16 val, volatile void __iomem *addr) 32 { 33 asm volatile("strh %w0, [%1]" : : "rZ" (val), "r" (addr)); 34 } 35 36 #define __raw_writel __raw_writel 37 static __always_inline void __raw_writel(u32 val, volatile void __iomem *addr) 38 { 39 asm volatile("str %w0, [%1]" : : "rZ" (val), "r" (addr)); 40 } 41 42 #define __raw_writeq __raw_writeq 43 static inline void __raw_writeq(u64 val, volatile void __iomem *addr) 44 { 45 asm volatile("str %x0, [%1]" : : "rZ" (val), "r" (addr)); 46 } 47 48 #define __raw_readb __raw_readb 49 static inline u8 __raw_readb(const volatile void __iomem *addr) 50 { 51 u8 val; 52 asm volatile(ALTERNATIVE("ldrb %w0, [%1]", 53 "ldarb %w0, [%1]", 54 ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) 55 : "=r" (val) : "r" (addr)); 56 return val; 57 } 58 59 #define __raw_readw __raw_readw 60 static inline u16 __raw_readw(const volatile void __iomem *addr) 61 { 62 u16 val; 63 64 asm volatile(ALTERNATIVE("ldrh %w0, [%1]", 65 "ldarh %w0, [%1]", 66 ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) 67 : "=r" (val) : "r" (addr)); 68 return val; 69 } 70 71 #define __raw_readl __raw_readl 72 static __always_inline u32 __raw_readl(const volatile void __iomem *addr) 73 { 74 u32 val; 75 asm volatile(ALTERNATIVE("ldr %w0, [%1]", 76 "ldar %w0, [%1]", 77 ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) 78 : "=r" (val) : "r" (addr)); 79 return val; 80 } 81 82 #define __raw_readq __raw_readq 83 static inline u64 __raw_readq(const volatile void __iomem *addr) 84 { 85 u64 val; 86 asm volatile(ALTERNATIVE("ldr %0, [%1]", 87 "ldar %0, [%1]", 88 ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) 89 : "=r" (val) : "r" (addr)); 90 return val; 91 } 92 93 /* IO barriers */ 94 #define __io_ar(v) \ 95 ({ \ 96 unsigned long tmp; \ 97 \ 98 dma_rmb(); \ 99 \ 100 /* \ 101 * Create a dummy control dependency from the IO read to any \ 102 * later instructions. This ensures that a subsequent call to \ 103 * udelay() will be ordered due to the ISB in get_cycles(). \ 104 */ \ 105 asm volatile("eor %0, %1, %1\n" \ 106 "cbnz %0, ." \ 107 : "=r" (tmp) : "r" ((unsigned long)(v)) \ 108 : "memory"); \ 109 }) 110 111 #define __io_bw() dma_wmb() 112 #define __io_br(v) 113 #define __io_aw(v) 114 115 /* arm64-specific, don't use in portable drivers */ 116 #define __iormb(v) __io_ar(v) 117 #define __iowmb() __io_bw() 118 #define __iomb() dma_mb() 119 120 /* 121 * I/O port access primitives. 122 */ 123 #define arch_has_dev_port() (1) 124 #define IO_SPACE_LIMIT (PCI_IO_SIZE - 1) 125 #define PCI_IOBASE ((void __iomem *)PCI_IO_START) 126 127 /* 128 * String version of I/O memory access operations. 129 */ 130 extern void __memcpy_fromio(void *, const volatile void __iomem *, size_t); 131 extern void __memcpy_toio(volatile void __iomem *, const void *, size_t); 132 extern void __memset_io(volatile void __iomem *, int, size_t); 133 134 #define memset_io(c,v,l) __memset_io((c),(v),(l)) 135 #define memcpy_fromio(a,c,l) __memcpy_fromio((a),(c),(l)) 136 #define memcpy_toio(c,a,l) __memcpy_toio((c),(a),(l)) 137 138 /* 139 * I/O memory mapping functions. 140 */ 141 142 bool ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned long prot); 143 #define ioremap_allowed ioremap_allowed 144 145 #define _PAGE_IOREMAP PROT_DEVICE_nGnRE 146 147 #define ioremap_wc(addr, size) \ 148 ioremap_prot((addr), (size), PROT_NORMAL_NC) 149 #define ioremap_np(addr, size) \ 150 ioremap_prot((addr), (size), PROT_DEVICE_nGnRnE) 151 152 /* 153 * io{read,write}{16,32,64}be() macros 154 */ 155 #define ioread16be(p) ({ __u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(__v); __v; }) 156 #define ioread32be(p) ({ __u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(__v); __v; }) 157 #define ioread64be(p) ({ __u64 __v = be64_to_cpu((__force __be64)__raw_readq(p)); __iormb(__v); __v; }) 158 159 #define iowrite16be(v,p) ({ __iowmb(); __raw_writew((__force __u16)cpu_to_be16(v), p); }) 160 #define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force __u32)cpu_to_be32(v), p); }) 161 #define iowrite64be(v,p) ({ __iowmb(); __raw_writeq((__force __u64)cpu_to_be64(v), p); }) 162 163 #include <asm-generic/io.h> 164 165 #define ioremap_cache ioremap_cache 166 static inline void __iomem *ioremap_cache(phys_addr_t addr, size_t size) 167 { 168 if (pfn_is_map_memory(__phys_to_pfn(addr))) 169 return (void __iomem *)__phys_to_virt(addr); 170 171 return ioremap_prot(addr, size, PROT_NORMAL); 172 } 173 174 /* 175 * More restrictive address range checking than the default implementation 176 * (PHYS_OFFSET and PHYS_MASK taken into account). 177 */ 178 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE 179 extern int valid_phys_addr_range(phys_addr_t addr, size_t size); 180 extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); 181 182 extern bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size, 183 unsigned long flags); 184 #define arch_memremap_can_ram_remap arch_memremap_can_ram_remap 185 186 #endif /* __ASM_IO_H */ 187