lib/iomap.c

   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(const void __iomem *addr)
  74 {
  75         IO_COND(addr, return inb(port), return readb(addr));
  76         return 0xff;
  77 }
  78 unsigned int ioread16(const void __iomem *addr)
  79 {
  80         IO_COND(addr, return inw(port), return readw(addr));
  81         return 0xffff;
  82 }
  83 unsigned int ioread16be(const void __iomem *addr)
  84 {
  85         IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
  86         return 0xffff;
  87 }
  88 unsigned int ioread32(const void __iomem *addr)
  89 {
  90         IO_COND(addr, return inl(port), return readl(addr));
  91         return 0xffffffff;
  92 }
  93 unsigned int ioread32be(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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 */