linux/include/asm-generic/io.h
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   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
  36static 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
  43static 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
  50static 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
  61static 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
  68static 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
  75static 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
  86static 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
  92static 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
 108static inline u8 inb(unsigned long addr)
 109{
 110        return readb(addr + PCI_IOBASE);
 111}
 112
 113static inline u16 inw(unsigned long addr)
 114{
 115        return readw(addr + PCI_IOBASE);
 116}
 117
 118static inline u32 inl(unsigned long addr)
 119{
 120        return readl(addr + PCI_IOBASE);
 121}
 122
 123static inline void outb(u8 b, unsigned long addr)
 124{
 125        writeb(b, addr + PCI_IOBASE);
 126}
 127
 128static inline void outw(u16 b, unsigned long addr)
 129{
 130        writew(b, addr + PCI_IOBASE);
 131}
 132
 133static 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
 146static 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
 159static 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
 172static 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
 185static 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
 197static 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
 209static 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
 220static inline void readsl(const void __iomem *addr, void *buf, int len)
 221{
 222        insl(addr - PCI_IOBASE, buf, len);
 223}
 224
 225static inline void readsw(const void __iomem *addr, void *buf, int len)
 226{
 227        insw(addr - PCI_IOBASE, buf, len);
 228}
 229
 230static inline void readsb(const void __iomem *addr, void *buf, int len)
 231{
 232        insb(addr - PCI_IOBASE, buf, len);
 233}
 234
 235static inline void writesl(const void __iomem *addr, const void *buf, int len)
 236{
 237        outsl(addr - PCI_IOBASE, buf, len);
 238}
 239
 240static inline void writesw(const void __iomem *addr, const void *buf, int len)
 241{
 242        outsw(addr - PCI_IOBASE, buf, len);
 243}
 244
 245static 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
 288struct pci_dev;
 289static 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 */
 298static inline unsigned long virt_to_phys(volatile void *address)
 299{
 300        return __pa((unsigned long)address);
 301}
 302
 303static 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
 315static 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
 330static inline void iounmap(void __iomem *addr)
 331{
 332}
 333#endif /* CONFIG_MMU */
 334
 335#ifdef CONFIG_HAS_IOPORT
 336#ifndef CONFIG_GENERIC_IOMAP
 337static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 338{
 339        return (void __iomem *) port;
 340}
 341
 342static inline void ioport_unmap(void __iomem *p)
 343{
 344}
 345#else /* CONFIG_GENERIC_IOMAP */
 346extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
 347extern 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
 355static inline unsigned long virt_to_bus(volatile void *address)
 356{
 357        return ((unsigned long) address);
 358}
 359
 360static 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 */
 373
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