1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Implement the default iomap interfaces 4 * 5 * (C) Copyright 2004 Linus Torvalds 6 */ 7 #include <linux/pci.h> 8 #include <linux/io.h> 9 10 #include <linux/export.h> 11 12 /* 13 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO 14 * access or a MMIO access, these functions don't care. The info is 15 * encoded in the hardware mapping set up by the mapping functions 16 * (or the cookie itself, depending on implementation and hw). 17 * 18 * The generic routines don't assume any hardware mappings, and just 19 * encode the PIO/MMIO as part of the cookie. They coldly assume that 20 * the MMIO IO mappings are not in the low address range. 21 * 22 * Architectures for which this is not true can't use this generic 23 * implementation and should do their own copy. 24 */ 25 26 #ifndef HAVE_ARCH_PIO_SIZE 27 /* 28 * We encode the physical PIO addresses (0-0xffff) into the 29 * pointer by offsetting them with a constant (0x10000) and 30 * assuming that all the low addresses are always PIO. That means 31 * we can do some sanity checks on the low bits, and don't 32 * need to just take things for granted. 33 */ 34 #define PIO_OFFSET 0x10000UL 35 #define PIO_MASK 0x0ffffUL 36 #define PIO_RESERVED 0x40000UL 37 #endif 38 39 static void bad_io_access(unsigned long port, const char *access) 40 { 41 static int count = 10; 42 if (count) { 43 count--; 44 WARN(1, KERN_ERR "Bad IO access at port %#lx (%s)\n", port, access); 45 } 46 } 47 48 /* 49 * Ugly macros are a way of life. 50 */ 51 #define IO_COND(addr, is_pio, is_mmio) do { \ 52 unsigned long port = (unsigned long __force)addr; \ 53 if (port >= PIO_RESERVED) { \ 54 is_mmio; \ 55 } else if (port > PIO_OFFSET) { \ 56 port &= PIO_MASK; \ 57 is_pio; \ 58 } else \ 59 bad_io_access(port, #is_pio ); \ 60 } while (0) 61 62 #ifndef pio_read16be 63 #define pio_read16be(port) swab16(inw(port)) 64 #define pio_read32be(port) swab32(inl(port)) 65 #endif 66 67 #ifndef mmio_read16be 68 #define mmio_read16be(addr) swab16(readw(addr)) 69 #define mmio_read32be(addr) swab32(readl(addr)) 70 #define mmio_read64be(addr) swab64(readq(addr)) 71 #endif 72 73 unsigned int ioread8(void __iomem *addr) 74 { 75 IO_COND(addr, return inb(port), return readb(addr)); 76 return 0xff; 77 } 78 unsigned int ioread16(void __iomem *addr) 79 { 80 IO_COND(addr, return inw(port), return readw(addr)); 81 return 0xffff; 82 } 83 unsigned int ioread16be(void __iomem *addr) 84 { 85 IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr)); 86 return 0xffff; 87 } 88 unsigned int ioread32(void __iomem *addr) 89 { 90 IO_COND(addr, return inl(port), return readl(addr)); 91 return 0xffffffff; 92 } 93 unsigned int ioread32be(void __iomem *addr) 94 { 95 IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr)); 96 return 0xffffffff; 97 } 98 EXPORT_SYMBOL(ioread8); 99 EXPORT_SYMBOL(ioread16); 100 EXPORT_SYMBOL(ioread16be); 101 EXPORT_SYMBOL(ioread32); 102 EXPORT_SYMBOL(ioread32be); 103 104 #ifdef readq 105 static u64 pio_read64_lo_hi(unsigned long port) 106 { 107 u64 lo, hi; 108 109 lo = inl(port); 110 hi = inl(port + sizeof(u32)); 111 112 return lo | (hi << 32); 113 } 114 115 static u64 pio_read64_hi_lo(unsigned long port) 116 { 117 u64 lo, hi; 118 119 hi = inl(port + sizeof(u32)); 120 lo = inl(port); 121 122 return lo | (hi << 32); 123 } 124 125 static u64 pio_read64be_lo_hi(unsigned long port) 126 { 127 u64 lo, hi; 128 129 lo = pio_read32be(port + sizeof(u32)); 130 hi = pio_read32be(port); 131 132 return lo | (hi << 32); 133 } 134 135 static u64 pio_read64be_hi_lo(unsigned long port) 136 { 137 u64 lo, hi; 138 139 hi = pio_read32be(port); 140 lo = pio_read32be(port + sizeof(u32)); 141 142 return lo | (hi << 32); 143 } 144 145 u64 ioread64_lo_hi(void __iomem *addr) 146 { 147 IO_COND(addr, return pio_read64_lo_hi(port), return readq(addr)); 148 return 0xffffffffffffffffULL; 149 } 150 151 u64 ioread64_hi_lo(void __iomem *addr) 152 { 153 IO_COND(addr, return pio_read64_hi_lo(port), return readq(addr)); 154 return 0xffffffffffffffffULL; 155 } 156 157 u64 ioread64be_lo_hi(void __iomem *addr) 158 { 159 IO_COND(addr, return pio_read64be_lo_hi(port), 160 return mmio_read64be(addr)); 161 return 0xffffffffffffffffULL; 162 } 163 164 u64 ioread64be_hi_lo(void __iomem *addr) 165 { 166 IO_COND(addr, return pio_read64be_hi_lo(port), 167 return mmio_read64be(addr)); 168 return 0xffffffffffffffffULL; 169 } 170 171 EXPORT_SYMBOL(ioread64_lo_hi); 172 EXPORT_SYMBOL(ioread64_hi_lo); 173 EXPORT_SYMBOL(ioread64be_lo_hi); 174 EXPORT_SYMBOL(ioread64be_hi_lo); 175 176 #endif /* readq */ 177 178 #ifndef pio_write16be 179 #define pio_write16be(val,port) outw(swab16(val),port) 180 #define pio_write32be(val,port) outl(swab32(val),port) 181 #endif 182 183 #ifndef mmio_write16be 184 #define mmio_write16be(val,port) writew(swab16(val),port) 185 #define mmio_write32be(val,port) writel(swab32(val),port) 186 #define mmio_write64be(val,port) writeq(swab64(val),port) 187 #endif 188 189 void iowrite8(u8 val, void __iomem *addr) 190 { 191 IO_COND(addr, outb(val,port), writeb(val, addr)); 192 } 193 void iowrite16(u16 val, void __iomem *addr) 194 { 195 IO_COND(addr, outw(val,port), writew(val, addr)); 196 } 197 void iowrite16be(u16 val, void __iomem *addr) 198 { 199 IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr)); 200 } 201 void iowrite32(u32 val, void __iomem *addr) 202 { 203 IO_COND(addr, outl(val,port), writel(val, addr)); 204 } 205 void iowrite32be(u32 val, void __iomem *addr) 206 { 207 IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr)); 208 } 209 EXPORT_SYMBOL(iowrite8); 210 EXPORT_SYMBOL(iowrite16); 211 EXPORT_SYMBOL(iowrite16be); 212 EXPORT_SYMBOL(iowrite32); 213 EXPORT_SYMBOL(iowrite32be); 214 215 #ifdef writeq 216 static void pio_write64_lo_hi(u64 val, unsigned long port) 217 { 218 outl(val, port); 219 outl(val >> 32, port + sizeof(u32)); 220 } 221 222 static void pio_write64_hi_lo(u64 val, unsigned long port) 223 { 224 outl(val >> 32, port + sizeof(u32)); 225 outl(val, port); 226 } 227 228 static void pio_write64be_lo_hi(u64 val, unsigned long port) 229 { 230 pio_write32be(val, port + sizeof(u32)); 231 pio_write32be(val >> 32, port); 232 } 233 234 static void pio_write64be_hi_lo(u64 val, unsigned long port) 235 { 236 pio_write32be(val >> 32, port); 237 pio_write32be(val, port + sizeof(u32)); 238 } 239 240 void iowrite64_lo_hi(u64 val, void __iomem *addr) 241 { 242 IO_COND(addr, pio_write64_lo_hi(val, port), 243 writeq(val, addr)); 244 } 245 246 void iowrite64_hi_lo(u64 val, void __iomem *addr) 247 { 248 IO_COND(addr, pio_write64_hi_lo(val, port), 249 writeq(val, addr)); 250 } 251 252 void iowrite64be_lo_hi(u64 val, void __iomem *addr) 253 { 254 IO_COND(addr, pio_write64be_lo_hi(val, port), 255 mmio_write64be(val, addr)); 256 } 257 258 void iowrite64be_hi_lo(u64 val, void __iomem *addr) 259 { 260 IO_COND(addr, pio_write64be_hi_lo(val, port), 261 mmio_write64be(val, addr)); 262 } 263 264 EXPORT_SYMBOL(iowrite64_lo_hi); 265 EXPORT_SYMBOL(iowrite64_hi_lo); 266 EXPORT_SYMBOL(iowrite64be_lo_hi); 267 EXPORT_SYMBOL(iowrite64be_hi_lo); 268 269 #endif /* readq */ 270 271 /* 272 * These are the "repeat MMIO read/write" functions. 273 * Note the "__raw" accesses, since we don't want to 274 * convert to CPU byte order. We write in "IO byte 275 * order" (we also don't have IO barriers). 276 */ 277 #ifndef mmio_insb 278 static inline void mmio_insb(void __iomem *addr, u8 *dst, int count) 279 { 280 while (--count >= 0) { 281 u8 data = __raw_readb(addr); 282 *dst = data; 283 dst++; 284 } 285 } 286 static inline void mmio_insw(void __iomem *addr, u16 *dst, int count) 287 { 288 while (--count >= 0) { 289 u16 data = __raw_readw(addr); 290 *dst = data; 291 dst++; 292 } 293 } 294 static inline void mmio_insl(void __iomem *addr, u32 *dst, int count) 295 { 296 while (--count >= 0) { 297 u32 data = __raw_readl(addr); 298 *dst = data; 299 dst++; 300 } 301 } 302 #endif 303 304 #ifndef mmio_outsb 305 static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count) 306 { 307 while (--count >= 0) { 308 __raw_writeb(*src, addr); 309 src++; 310 } 311 } 312 static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count) 313 { 314 while (--count >= 0) { 315 __raw_writew(*src, addr); 316 src++; 317 } 318 } 319 static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count) 320 { 321 while (--count >= 0) { 322 __raw_writel(*src, addr); 323 src++; 324 } 325 } 326 #endif 327 328 void ioread8_rep(void __iomem *addr, void *dst, unsigned long count) 329 { 330 IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count)); 331 } 332 void ioread16_rep(void __iomem *addr, void *dst, unsigned long count) 333 { 334 IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count)); 335 } 336 void ioread32_rep(void __iomem *addr, void *dst, unsigned long count) 337 { 338 IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count)); 339 } 340 EXPORT_SYMBOL(ioread8_rep); 341 EXPORT_SYMBOL(ioread16_rep); 342 EXPORT_SYMBOL(ioread32_rep); 343 344 void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count) 345 { 346 IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count)); 347 } 348 void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count) 349 { 350 IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count)); 351 } 352 void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count) 353 { 354 IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count)); 355 } 356 EXPORT_SYMBOL(iowrite8_rep); 357 EXPORT_SYMBOL(iowrite16_rep); 358 EXPORT_SYMBOL(iowrite32_rep); 359 360 #ifdef CONFIG_HAS_IOPORT_MAP 361 /* Create a virtual mapping cookie for an IO port range */ 362 void __iomem *ioport_map(unsigned long port, unsigned int nr) 363 { 364 if (port > PIO_MASK) 365 return NULL; 366 return (void __iomem *) (unsigned long) (port + PIO_OFFSET); 367 } 368 369 void ioport_unmap(void __iomem *addr) 370 { 371 /* Nothing to do */ 372 } 373 EXPORT_SYMBOL(ioport_map); 374 EXPORT_SYMBOL(ioport_unmap); 375 #endif /* CONFIG_HAS_IOPORT_MAP */ 376 377 #ifdef CONFIG_PCI 378 /* Hide the details if this is a MMIO or PIO address space and just do what 379 * you expect in the correct way. */ 380 void pci_iounmap(struct pci_dev *dev, void __iomem * addr) 381 { 382 IO_COND(addr, /* nothing */, iounmap(addr)); 383 } 384 EXPORT_SYMBOL(pci_iounmap); 385 #endif /* CONFIG_PCI */ 386