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