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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 | /* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright (C) 2013-2014, 2020 Synopsys, Inc. All rights reserved. */ #ifndef __ASM_ARC_IO_H #define __ASM_ARC_IO_H #include <linux/types.h> #include <asm/byteorder.h> /* * Compiler barrier. It prevents compiler from reordering instructions before * and after it. It doesn't prevent HW (CPU) from any reordering though. */ #define __comp_b() asm volatile("" : : : "memory") #ifdef __ARCHS__ /* * ARCv2 based HS38 cores are in-order issue, but still weakly ordered * due to micro-arch buffering/queuing of load/store, cache hit vs. miss ... * * Explicit barrier provided by DMB instruction * - Operand supports fine grained load/store/load+store semantics * - Ensures that selected memory operation issued before it will complete * before any subsequent memory operation of same type * - DMB guarantees SMP as well as local barrier semantics * (asm-generic/barrier.h ensures sane smp_*mb if not defined here, i.e. * UP: barrier(), SMP: smp_*mb == *mb) * - DSYNC provides DMB+completion_of_cache_bpu_maintenance_ops hence not needed * in the general case. Plus it only provides full barrier. */ #define mb() asm volatile("dmb 3\n" : : : "memory") #define rmb() asm volatile("dmb 1\n" : : : "memory") #define wmb() asm volatile("dmb 2\n" : : : "memory") #else /* * ARCompact based cores (ARC700) only have SYNC instruction which is super * heavy weight as it flushes the pipeline as well. * There are no real SMP implementations of such cores. */ #define mb() asm volatile("sync\n" : : : "memory") #endif #ifdef __ARCHS__ #define __iormb() rmb() #define __iowmb() wmb() #else #define __iormb() __comp_b() #define __iowmb() __comp_b() #endif static inline void sync(void) { /* Not yet implemented */ } /* * We must use 'volatile' in C-version read/write IO accessors implementation * to avoid merging several reads (writes) into one read (write), or optimizing * them out by compiler. * We must use compiler barriers before and after operation (read or write) so * it won't be reordered by compiler. */ #define __arch_getb(a) ({ u8 __v; __comp_b(); __v = *(volatile u8 *)(a); __comp_b(); __v; }) #define __arch_getw(a) ({ u16 __v; __comp_b(); __v = *(volatile u16 *)(a); __comp_b(); __v; }) #define __arch_getl(a) ({ u32 __v; __comp_b(); __v = *(volatile u32 *)(a); __comp_b(); __v; }) #define __arch_getq(a) ({ u64 __v; __comp_b(); __v = *(volatile u64 *)(a); __comp_b(); __v; }) #define __arch_putb(v, a) ({ __comp_b(); *(volatile u8 *)(a) = (v); __comp_b(); }) #define __arch_putw(v, a) ({ __comp_b(); *(volatile u16 *)(a) = (v); __comp_b(); }) #define __arch_putl(v, a) ({ __comp_b(); *(volatile u32 *)(a) = (v); __comp_b(); }) #define __arch_putq(v, a) ({ __comp_b(); *(volatile u64 *)(a) = (v); __comp_b(); }) /* * We add memory barriers for __raw_readX / __raw_writeX accessors same way as * it is done for readX and writeX accessors as lots of U-Boot driver uses * __raw_readX / __raw_writeX instead of proper accessor with barrier. */ #define __raw_writeb(v, c) ({ __iowmb(); __arch_putb(v, c); }) #define __raw_writew(v, c) ({ __iowmb(); __arch_putw(v, c); }) #define __raw_writel(v, c) ({ __iowmb(); __arch_putl(v, c); }) #define __raw_writeq(v, c) ({ __iowmb(); __arch_putq(v, c); }) #define __raw_readb(c) ({ u8 __v = __arch_getb(c); __iormb(); __v; }) #define __raw_readw(c) ({ u16 __v = __arch_getw(c); __iormb(); __v; }) #define __raw_readl(c) ({ u32 __v = __arch_getl(c); __iormb(); __v; }) #define __raw_readq(c) ({ u64 __v = __arch_getq(c); __iormb(); __v; }) static inline void __raw_writesb(unsigned long addr, const void *data, int bytelen) { u8 *buf = (uint8_t *)data; __iowmb(); while (bytelen--) __arch_putb(*buf++, addr); } static inline void __raw_writesw(unsigned long addr, const void *data, int wordlen) { u16 *buf = (uint16_t *)data; __iowmb(); while (wordlen--) __arch_putw(*buf++, addr); } static inline void __raw_writesl(unsigned long addr, const void *data, int longlen) { u32 *buf = (uint32_t *)data; __iowmb(); while (longlen--) __arch_putl(*buf++, addr); } static inline void __raw_readsb(unsigned long addr, void *data, int bytelen) { u8 *buf = (uint8_t *)data; while (bytelen--) *buf++ = __arch_getb(addr); __iormb(); } static inline void __raw_readsw(unsigned long addr, void *data, int wordlen) { u16 *buf = (uint16_t *)data; while (wordlen--) *buf++ = __arch_getw(addr); __iormb(); } static inline void __raw_readsl(unsigned long addr, void *data, int longlen) { u32 *buf = (uint32_t *)data; while (longlen--) *buf++ = __arch_getl(addr); __iormb(); } /* * Relaxed I/O memory access primitives. These follow the Device memory * ordering rules but do not guarantee any ordering relative to Normal memory * accesses. */ #define readb_relaxed(c) ({ u8 __r = __arch_getb(c); __r; }) #define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16)__arch_getw(c)); __r; }) #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32)__arch_getl(c)); __r; }) #define readq_relaxed(c) ({ u64 __r = le64_to_cpu((__force __le64)__arch_getq(c)); __r; }) #define writeb_relaxed(v, c) ((void)__arch_putb((v), (c))) #define writew_relaxed(v, c) ((void)__arch_putw((__force u16)cpu_to_le16(v), (c))) #define writel_relaxed(v, c) ((void)__arch_putl((__force u32)cpu_to_le32(v), (c))) #define writeq_relaxed(v, c) ((void)__arch_putq((__force u64)cpu_to_le64(v), (c))) /* * MMIO can also get buffered/optimized in micro-arch, so barriers needed * Based on ARM model for the typical use case * * <ST [DMA buffer]> * <writel MMIO "go" reg> * or: * <readl MMIO "status" reg> * <LD [DMA buffer]> * * http://lkml.kernel.org/r/20150622133656.GG1583@arm.com */ #define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; }) #define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; }) #define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; }) #define readq(c) ({ u64 __v = readq_relaxed(c); __iormb(); __v; }) #define writeb(v, c) ({ __iowmb(); writeb_relaxed(v, c); }) #define writew(v, c) ({ __iowmb(); writew_relaxed(v, c); }) #define writel(v, c) ({ __iowmb(); writel_relaxed(v, c); }) #define writeq(v, c) ({ __iowmb(); writeq_relaxed(v, c); }) #define out_arch(type, endian, a, v) __raw_write##type(cpu_to_##endian(v), a) #define in_arch(type, endian, a) endian##_to_cpu(__raw_read##type(a)) #define out_le32(a, v) out_arch(l, le32, a, v) #define out_le16(a, v) out_arch(w, le16, a, v) #define in_le32(a) in_arch(l, le32, a) #define in_le16(a) in_arch(w, le16, a) #define out_be32(a, v) out_arch(l, be32, a, v) #define out_be16(a, v) out_arch(w, be16, a, v) #define in_be32(a) in_arch(l, be32, a) #define in_be16(a) in_arch(w, be16, a) #define out_8(a, v) __raw_writeb(v, a) #define in_8(a) __raw_readb(a) /* * Clear and set bits in one shot. These macros can be used to clear and * set multiple bits in a register using a single call. These macros can * also be used to set a multiple-bit bit pattern using a mask, by * specifying the mask in the 'clear' parameter and the new bit pattern * in the 'set' parameter. */ #define clrbits(type, addr, clear) \ out_##type((addr), in_##type(addr) & ~(clear)) #define setbits(type, addr, set) \ out_##type((addr), in_##type(addr) | (set)) #define clrsetbits(type, addr, clear, set) \ out_##type((addr), (in_##type(addr) & ~(clear)) | (set)) #define clrbits_be32(addr, clear) clrbits(be32, addr, clear) #define setbits_be32(addr, set) setbits(be32, addr, set) #define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set) #define clrbits_le32(addr, clear) clrbits(le32, addr, clear) #define setbits_le32(addr, set) setbits(le32, addr, set) #define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set) #define clrbits_be16(addr, clear) clrbits(be16, addr, clear) #define setbits_be16(addr, set) setbits(be16, addr, set) #define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set) #define clrbits_le16(addr, clear) clrbits(le16, addr, clear) #define setbits_le16(addr, set) setbits(le16, addr, set) #define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set) #define clrbits_8(addr, clear) clrbits(8, addr, clear) #define setbits_8(addr, set) setbits(8, addr, set) #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set) #include <asm-generic/io.h> #endif /* __ASM_ARC_IO_H */ |