include/asm-generic/io.h

   1 /* Generic I/O port emulation, based on MN10300 code
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #ifndef __ASM_GENERIC_IO_H
  12 #define __ASM_GENERIC_IO_H
  13
  14 #include <asm/page.h> /* I/O is all done through memory accesses */
  15 #include <asm/cacheflush.h>
  16 #include <linux/types.h>
  17
  18 #ifdef CONFIG_GENERIC_IOMAP
  19 #include <asm-generic/iomap.h>
  20 #endif
  21
  22 #include <asm-generic/pci_iomap.h>
  23
  24 #ifndef mmiowb
  25 #define mmiowb() do {} while (0)
  26 #endif
  27
  28 /*****************************************************************************/
  29 /*
  30  * readX/writeX() are used to access memory mapped devices. On some
  31  * architectures the memory mapped IO stuff needs to be accessed
  32  * differently. On the simple architectures, we just read/write the
  33  * memory location directly.
  34  */
  35 #ifndef __raw_readb
  36 static inline u8 __raw_readb(const volatile void __iomem *addr)
  37 {
  38         return *(const volatile u8 __force *) addr;
  39 }
  40 #endif
  41
  42 #ifndef __raw_readw
  43 static inline u16 __raw_readw(const volatile void __iomem *addr)
  44 {
  45         return *(const volatile u16 __force *) addr;
  46 }
  47 #endif
  48
  49 #ifndef __raw_readl
  50 static inline u32 __raw_readl(const volatile void __iomem *addr)
  51 {
  52         return *(const volatile u32 __force *) addr;
  53 }
  54 #endif
  55
  56 #define readb __raw_readb
  57 #define readw(addr) __le16_to_cpu(__raw_readw(addr))
  58 #define readl(addr) __le32_to_cpu(__raw_readl(addr))
  59
  60 #ifndef __raw_writeb
  61 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
  62 {
  63         *(volatile u8 __force *) addr = b;
  64 }
  65 #endif
  66
  67 #ifndef __raw_writew
  68 static inline void __raw_writew(u16 b, volatile void __iomem *addr)
  69 {
  70         *(volatile u16 __force *) addr = b;
  71 }
  72 #endif
  73
  74 #ifndef __raw_writel
  75 static inline void __raw_writel(u32 b, volatile void __iomem *addr)
  76 {
  77         *(volatile u32 __force *) addr = b;
  78 }
  79 #endif
  80
  81 #define writeb __raw_writeb
  82 #define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
  83 #define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
  84
  85 #ifdef CONFIG_64BIT
  86 static inline u64 __raw_readq(const volatile void __iomem *addr)
  87 {
  88         return *(const volatile u64 __force *) addr;
  89 }
  90 #define readq(addr) __le64_to_cpu(__raw_readq(addr))
  91
  92 static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
  93 {
  94         *(volatile u64 __force *) addr = b;
  95 }
  96 #define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
  97 #endif
  98
  99 #ifndef PCI_IOBASE
 100 #define PCI_IOBASE ((void __iomem *) 0)
 101 #endif
 102
 103 /*****************************************************************************/
 104 /*
 105  * traditional input/output functions
 106  */
 107
 108 static inline u8 inb(unsigned long addr)
 109 {
 110         return readb(addr + PCI_IOBASE);
 111 }
 112
 113 static inline u16 inw(unsigned long addr)
 114 {
 115         return readw(addr + PCI_IOBASE);
 116 }
 117
 118 static inline u32 inl(unsigned long addr)
 119 {
 120         return readl(addr + PCI_IOBASE);
 121 }
 122
 123 static inline void outb(u8 b, unsigned long addr)
 124 {
 125         writeb(b, addr + PCI_IOBASE);
 126 }
 127
 128 static inline void outw(u16 b, unsigned long addr)
 129 {
 130         writew(b, addr + PCI_IOBASE);
 131 }
 132
 133 static inline void outl(u32 b, unsigned long addr)
 134 {
 135         writel(b, addr + PCI_IOBASE);
 136 }
 137
 138 #define inb_p(addr)     inb(addr)
 139 #define inw_p(addr)     inw(addr)
 140 #define inl_p(addr)     inl(addr)
 141 #define outb_p(x, addr) outb((x), (addr))
 142 #define outw_p(x, addr) outw((x), (addr))
 143 #define outl_p(x, addr) outl((x), (addr))
 144
 145 #ifndef insb
 146 static inline void insb(unsigned long addr, void *buffer, int count)
 147 {
 148         if (count) {
 149                 u8 *buf = buffer;
 150                 do {
 151                         u8 x = inb(addr);
 152                         *buf++ = x;
 153                 } while (--count);
 154         }
 155 }
 156 #endif
 157
 158 #ifndef insw
 159 static inline void insw(unsigned long addr, void *buffer, int count)
 160 {
 161         if (count) {
 162                 u16 *buf = buffer;
 163                 do {
 164                         u16 x = inw(addr);
 165                         *buf++ = x;
 166                 } while (--count);
 167         }
 168 }
 169 #endif
 170
 171 #ifndef insl
 172 static inline void insl(unsigned long addr, void *buffer, int count)
 173 {
 174         if (count) {
 175                 u32 *buf = buffer;
 176                 do {
 177                         u32 x = inl(addr);
 178                         *buf++ = x;
 179                 } while (--count);
 180         }
 181 }
 182 #endif
 183
 184 #ifndef outsb
 185 static inline void outsb(unsigned long addr, const void *buffer, int count)
 186 {
 187         if (count) {
 188                 const u8 *buf = buffer;
 189                 do {
 190                         outb(*buf++, addr);
 191                 } while (--count);
 192         }
 193 }
 194 #endif
 195
 196 #ifndef outsw
 197 static inline void outsw(unsigned long addr, const void *buffer, int count)
 198 {
 199         if (count) {
 200                 const u16 *buf = buffer;
 201                 do {
 202                         outw(*buf++, addr);
 203                 } while (--count);
 204         }
 205 }
 206 #endif
 207
 208 #ifndef outsl
 209 static inline void outsl(unsigned long addr, const void *buffer, int count)
 210 {
 211         if (count) {
 212                 const u32 *buf = buffer;
 213                 do {
 214                         outl(*buf++, addr);
 215                 } while (--count);
 216         }
 217 }
 218 #endif
 219
 220 static inline void readsl(const void __iomem *addr, void *buf, int len)
 221 {
 222         insl(addr - PCI_IOBASE, buf, len);
 223 }
 224
 225 static inline void readsw(const void __iomem *addr, void *buf, int len)
 226 {
 227         insw(addr - PCI_IOBASE, buf, len);
 228 }
 229
 230 static inline void readsb(const void __iomem *addr, void *buf, int len)
 231 {
 232         insb(addr - PCI_IOBASE, buf, len);
 233 }
 234
 235 static inline void writesl(const void __iomem *addr, const void *buf, int len)
 236 {
 237         outsl(addr - PCI_IOBASE, buf, len);
 238 }
 239
 240 static inline void writesw(const void __iomem *addr, const void *buf, int len)
 241 {
 242         outsw(addr - PCI_IOBASE, buf, len);
 243 }
 244
 245 static inline void writesb(const void __iomem *addr, const void *buf, int len)
 246 {
 247         outsb(addr - PCI_IOBASE, buf, len);
 248 }
 249
 250 #ifndef CONFIG_GENERIC_IOMAP
 251 #define ioread8(addr)           readb(addr)
 252 #define ioread16(addr)          readw(addr)
 253 #define ioread16be(addr)        be16_to_cpu(ioread16(addr))
 254 #define ioread32(addr)          readl(addr)
 255 #define ioread32be(addr)        be32_to_cpu(ioread32(addr))
 256
 257 #define iowrite8(v, addr)       writeb((v), (addr))
 258 #define iowrite16(v, addr)      writew((v), (addr))
 259 #define iowrite16be(v, addr)    iowrite16(be16_to_cpu(v), (addr))
 260 #define iowrite32(v, addr)      writel((v), (addr))
 261 #define iowrite32be(v, addr)    iowrite32(be32_to_cpu(v), (addr))
 262
 263 #define ioread8_rep(p, dst, count) \
 264         insb((unsigned long) (p), (dst), (count))
 265 #define ioread16_rep(p, dst, count) \
 266         insw((unsigned long) (p), (dst), (count))
 267 #define ioread32_rep(p, dst, count) \
 268         insl((unsigned long) (p), (dst), (count))
 269
 270 #define iowrite8_rep(p, src, count) \
 271         outsb((unsigned long) (p), (src), (count))
 272 #define iowrite16_rep(p, src, count) \
 273         outsw((unsigned long) (p), (src), (count))
 274 #define iowrite32_rep(p, src, count) \
 275         outsl((unsigned long) (p), (src), (count))
 276 #endif /* CONFIG_GENERIC_IOMAP */
 277
 278 #ifndef IO_SPACE_LIMIT
 279 #define IO_SPACE_LIMIT 0xffff
 280 #endif
 281
 282 #ifdef __KERNEL__
 283
 284 #include <linux/vmalloc.h>
 285 #define __io_virt(x) ((void __force *) (x))
 286
 287 #ifndef CONFIG_GENERIC_IOMAP
 288 struct pci_dev;
 289 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
 290 {
 291 }
 292 #endif /* CONFIG_GENERIC_IOMAP */
 293
 294 /*
 295  * Change virtual addresses to physical addresses and vv.
 296  * These are pretty trivial
 297  */
 298 static inline unsigned long virt_to_phys(volatile void *address)
 299 {
 300         return __pa((unsigned long)address);
 301 }
 302
 303 static inline void *phys_to_virt(unsigned long address)
 304 {
 305         return __va(address);
 306 }
 307
 308 /*
 309  * Change "struct page" to physical address.
 310  *
 311  * This implementation is for the no-MMU case only... if you have an MMU
 312  * you'll need to provide your own definitions.
 313  */
 314 #ifndef CONFIG_MMU
 315 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
 316 {
 317         return (void __iomem*) (unsigned long)offset;
 318 }
 319
 320 #define __ioremap(offset, size, flags)  ioremap(offset, size)
 321
 322 #ifndef ioremap_nocache
 323 #define ioremap_nocache ioremap
 324 #endif
 325
 326 #ifndef ioremap_wc
 327 #define ioremap_wc ioremap_nocache
 328 #endif
 329
 330 static inline void iounmap(void __iomem *addr)
 331 {
 332 }
 333 #endif /* CONFIG_MMU */
 334
 335 #ifdef CONFIG_HAS_IOPORT
 336 #ifndef CONFIG_GENERIC_IOMAP
 337 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 338 {
 339         return (void __iomem *) port;
 340 }
 341
 342 static inline void ioport_unmap(void __iomem *p)
 343 {
 344 }
 345 #else /* CONFIG_GENERIC_IOMAP */
 346 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
 347 extern void ioport_unmap(void __iomem *p);
 348 #endif /* CONFIG_GENERIC_IOMAP */
 349 #endif /* CONFIG_HAS_IOPORT */
 350
 351 #define xlate_dev_kmem_ptr(p)   p
 352 #define xlate_dev_mem_ptr(p)    __va(p)
 353
 354 #ifndef virt_to_bus
 355 static inline unsigned long virt_to_bus(volatile void *address)
 356 {
 357         return ((unsigned long) address);
 358 }
 359
 360 static inline void *bus_to_virt(unsigned long address)
 361 {
 362         return (void *) address;
 363 }
 364 #endif
 365
 366 #define memset_io(a, b, c)      memset(__io_virt(a), (b), (c))
 367 #define memcpy_fromio(a, b, c)  memcpy((a), __io_virt(b), (c))
 368 #define memcpy_toio(a, b, c)    memcpy(__io_virt(a), (b), (c))
 369
 370 #endif /* __KERNEL__ */
 371
 372 #endif /* __ASM_GENERIC_IO_H */