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 #ifndef mmiowb
  23 #define mmiowb() do {} while (0)
  24 #endif
  25
  26 /*****************************************************************************/
  27 /*
  28  * readX/writeX() are used to access memory mapped devices. On some
  29  * architectures the memory mapped IO stuff needs to be accessed
  30  * differently. On the simple architectures, we just read/write the
  31  * memory location directly.
  32  */
  33 #ifndef __raw_readb
  34 static inline u8 __raw_readb(const volatile void __iomem *addr)
  35 {
  36         return *(const volatile u8 __force *) addr;
  37 }
  38 #endif
  39
  40 #ifndef __raw_readw
  41 static inline u16 __raw_readw(const volatile void __iomem *addr)
  42 {
  43         return *(const volatile u16 __force *) addr;
  44 }
  45 #endif
  46
  47 #ifndef __raw_readl
  48 static inline u32 __raw_readl(const volatile void __iomem *addr)
  49 {
  50         return *(const volatile u32 __force *) addr;
  51 }
  52 #endif
  53
  54 #define readb __raw_readb
  55 #define readw(addr) __le16_to_cpu(__raw_readw(addr))
  56 #define readl(addr) __le32_to_cpu(__raw_readl(addr))
  57
  58 #ifndef __raw_writeb
  59 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
  60 {
  61         *(volatile u8 __force *) addr = b;
  62 }
  63 #endif
  64
  65 #ifndef __raw_writew
  66 static inline void __raw_writew(u16 b, volatile void __iomem *addr)
  67 {
  68         *(volatile u16 __force *) addr = b;
  69 }
  70 #endif
  71
  72 #ifndef __raw_writel
  73 static inline void __raw_writel(u32 b, volatile void __iomem *addr)
  74 {
  75         *(volatile u32 __force *) addr = b;
  76 }
  77 #endif
  78
  79 #define writeb __raw_writeb
  80 #define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
  81 #define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
  82
  83 #ifdef CONFIG_64BIT
  84 static inline u64 __raw_readq(const volatile void __iomem *addr)
  85 {
  86         return *(const volatile u64 __force *) addr;
  87 }
  88 #define readq(addr) __le64_to_cpu(__raw_readq(addr))
  89
  90 static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
  91 {
  92         *(volatile u64 __force *) addr = b;
  93 }
  94 #define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
  95 #endif
  96
  97 #ifndef PCI_IOBASE
  98 #define PCI_IOBASE ((void __iomem *) 0)
  99 #endif
 100
 101 /*****************************************************************************/
 102 /*
 103  * traditional input/output functions
 104  */
 105
 106 static inline u8 inb(unsigned long addr)
 107 {
 108         return readb(addr + PCI_IOBASE);
 109 }
 110
 111 static inline u16 inw(unsigned long addr)
 112 {
 113         return readw(addr + PCI_IOBASE);
 114 }
 115
 116 static inline u32 inl(unsigned long addr)
 117 {
 118         return readl(addr + PCI_IOBASE);
 119 }
 120
 121 static inline void outb(u8 b, unsigned long addr)
 122 {
 123         writeb(b, addr + PCI_IOBASE);
 124 }
 125
 126 static inline void outw(u16 b, unsigned long addr)
 127 {
 128         writew(b, addr + PCI_IOBASE);
 129 }
 130
 131 static inline void outl(u32 b, unsigned long addr)
 132 {
 133         writel(b, addr + PCI_IOBASE);
 134 }
 135
 136 #define inb_p(addr)     inb(addr)
 137 #define inw_p(addr)     inw(addr)
 138 #define inl_p(addr)     inl(addr)
 139 #define outb_p(x, addr) outb((x), (addr))
 140 #define outw_p(x, addr) outw((x), (addr))
 141 #define outl_p(x, addr) outl((x), (addr))
 142
 143 #ifndef insb
 144 static inline void insb(unsigned long addr, void *buffer, int count)
 145 {
 146         if (count) {
 147                 u8 *buf = buffer;
 148                 do {
 149                         u8 x = inb(addr);
 150                         *buf++ = x;
 151                 } while (--count);
 152         }
 153 }
 154 #endif
 155
 156 #ifndef insw
 157 static inline void insw(unsigned long addr, void *buffer, int count)
 158 {
 159         if (count) {
 160                 u16 *buf = buffer;
 161                 do {
 162                         u16 x = inw(addr);
 163                         *buf++ = x;
 164                 } while (--count);
 165         }
 166 }
 167 #endif
 168
 169 #ifndef insl
 170 static inline void insl(unsigned long addr, void *buffer, int count)
 171 {
 172         if (count) {
 173                 u32 *buf = buffer;
 174                 do {
 175                         u32 x = inl(addr);
 176                         *buf++ = x;
 177                 } while (--count);
 178         }
 179 }
 180 #endif
 181
 182 #ifndef outsb
 183 static inline void outsb(unsigned long addr, const void *buffer, int count)
 184 {
 185         if (count) {
 186                 const u8 *buf = buffer;
 187                 do {
 188                         outb(*buf++, addr);
 189                 } while (--count);
 190         }
 191 }
 192 #endif
 193
 194 #ifndef outsw
 195 static inline void outsw(unsigned long addr, const void *buffer, int count)
 196 {
 197         if (count) {
 198                 const u16 *buf = buffer;
 199                 do {
 200                         outw(*buf++, addr);
 201                 } while (--count);
 202         }
 203 }
 204 #endif
 205
 206 #ifndef outsl
 207 static inline void outsl(unsigned long addr, const void *buffer, int count)
 208 {
 209         if (count) {
 210                 const u32 *buf = buffer;
 211                 do {
 212                         outl(*buf++, addr);
 213                 } while (--count);
 214         }
 215 }
 216 #endif
 217
 218 static inline void readsl(const void __iomem *addr, void *buf, int len)
 219 {
 220         insl(addr - PCI_IOBASE, buf, len);
 221 }
 222
 223 static inline void readsw(const void __iomem *addr, void *buf, int len)
 224 {
 225         insw(addr - PCI_IOBASE, buf, len);
 226 }
 227
 228 static inline void readsb(const void __iomem *addr, void *buf, int len)
 229 {
 230         insb(addr - PCI_IOBASE, buf, len);
 231 }
 232
 233 static inline void writesl(const void __iomem *addr, const void *buf, int len)
 234 {
 235         outsl(addr - PCI_IOBASE, buf, len);
 236 }
 237
 238 static inline void writesw(const void __iomem *addr, const void *buf, int len)
 239 {
 240         outsw(addr - PCI_IOBASE, buf, len);
 241 }
 242
 243 static inline void writesb(const void __iomem *addr, const void *buf, int len)
 244 {
 245         outsb(addr - PCI_IOBASE, buf, len);
 246 }
 247
 248 #ifndef CONFIG_GENERIC_IOMAP
 249 #define ioread8(addr)           readb(addr)
 250 #define ioread16(addr)          readw(addr)
 251 #define ioread16be(addr)        be16_to_cpu(ioread16(addr))
 252 #define ioread32(addr)          readl(addr)
 253 #define ioread32be(addr)        be32_to_cpu(ioread32(addr))
 254
 255 #define iowrite8(v, addr)       writeb((v), (addr))
 256 #define iowrite16(v, addr)      writew((v), (addr))
 257 #define iowrite16be(v, addr)    iowrite16(be16_to_cpu(v), (addr))
 258 #define iowrite32(v, addr)      writel((v), (addr))
 259 #define iowrite32be(v, addr)    iowrite32(be32_to_cpu(v), (addr))
 260
 261 #define ioread8_rep(p, dst, count) \
 262         insb((unsigned long) (p), (dst), (count))
 263 #define ioread16_rep(p, dst, count) \
 264         insw((unsigned long) (p), (dst), (count))
 265 #define ioread32_rep(p, dst, count) \
 266         insl((unsigned long) (p), (dst), (count))
 267
 268 #define iowrite8_rep(p, src, count) \
 269         outsb((unsigned long) (p), (src), (count))
 270 #define iowrite16_rep(p, src, count) \
 271         outsw((unsigned long) (p), (src), (count))
 272 #define iowrite32_rep(p, src, count) \
 273         outsl((unsigned long) (p), (src), (count))
 274 #endif /* CONFIG_GENERIC_IOMAP */
 275
 276 #ifndef IO_SPACE_LIMIT
 277 #define IO_SPACE_LIMIT 0xffff
 278 #endif
 279
 280 #ifdef __KERNEL__
 281
 282 #include <linux/vmalloc.h>
 283 #define __io_virt(x) ((void __force *) (x))
 284
 285 #ifndef CONFIG_GENERIC_IOMAP
 286 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 287 struct pci_dev;
 288 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
 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 *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 */