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