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 #define mmiowb() do {} while (0)
  23
  24 /*****************************************************************************/
  25 /*
  26  * readX/writeX() are used to access memory mapped devices. On some
  27  * architectures the memory mapped IO stuff needs to be accessed
  28  * differently. On the simple architectures, we just read/write the
  29  * memory location directly.
  30  */
  31 static inline u8 __raw_readb(const volatile void __iomem *addr)
  32 {
  33         return *(const volatile u8 __force *) addr;
  34 }
  35
  36 static inline u16 __raw_readw(const volatile void __iomem *addr)
  37 {
  38         return *(const volatile u16 __force *) addr;
  39 }
  40
  41 static inline u32 __raw_readl(const volatile void __iomem *addr)
  42 {
  43         return *(const volatile u32 __force *) addr;
  44 }
  45
  46 #define readb __raw_readb
  47 #define readw(addr) __le16_to_cpu(__raw_readw(addr))
  48 #define readl(addr) __le32_to_cpu(__raw_readl(addr))
  49
  50 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
  51 {
  52         *(volatile u8 __force *) addr = b;
  53 }
  54
  55 static inline void __raw_writew(u16 b, volatile void __iomem *addr)
  56 {
  57         *(volatile u16 __force *) addr = b;
  58 }
  59
  60 static inline void __raw_writel(u32 b, volatile void __iomem *addr)
  61 {
  62         *(volatile u32 __force *) addr = b;
  63 }
  64
  65 #define writeb __raw_writeb
  66 #define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
  67 #define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
  68
  69 #ifdef CONFIG_64BIT
  70 static inline u64 __raw_readq(const volatile void __iomem *addr)
  71 {
  72         return *(const volatile u64 __force *) addr;
  73 }
  74 #define readq(addr) __le64_to_cpu(__raw_readq(addr))
  75
  76 static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
  77 {
  78         *(volatile u64 __force *) addr = b;
  79 }
  80 #define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
  81 #endif
  82
  83 /*****************************************************************************/
  84 /*
  85  * traditional input/output functions
  86  */
  87
  88 static inline u8 inb(unsigned long addr)
  89 {
  90         return readb((volatile void __iomem *) addr);
  91 }
  92
  93 static inline u16 inw(unsigned long addr)
  94 {
  95         return readw((volatile void __iomem *) addr);
  96 }
  97
  98 static inline u32 inl(unsigned long addr)
  99 {
 100         return readl((volatile void __iomem *) addr);
 101 }
 102
 103 static inline void outb(u8 b, unsigned long addr)
 104 {
 105         writeb(b, (volatile void __iomem *) addr);
 106 }
 107
 108 static inline void outw(u16 b, unsigned long addr)
 109 {
 110         writew(b, (volatile void __iomem *) addr);
 111 }
 112
 113 static inline void outl(u32 b, unsigned long addr)
 114 {
 115         writel(b, (volatile void __iomem *) addr);
 116 }
 117
 118 #define inb_p(addr)     inb(addr)
 119 #define inw_p(addr)     inw(addr)
 120 #define inl_p(addr)     inl(addr)
 121 #define outb_p(x, addr) outb((x), (addr))
 122 #define outw_p(x, addr) outw((x), (addr))
 123 #define outl_p(x, addr) outl((x), (addr))
 124
 125 static inline void insb(unsigned long addr, void *buffer, int count)
 126 {
 127         if (count) {
 128                 u8 *buf = buffer;
 129                 do {
 130                         u8 x = inb(addr);
 131                         *buf++ = x;
 132                 } while (--count);
 133         }
 134 }
 135
 136 static inline void insw(unsigned long addr, void *buffer, int count)
 137 {
 138         if (count) {
 139                 u16 *buf = buffer;
 140                 do {
 141                         u16 x = inw(addr);
 142                         *buf++ = x;
 143                 } while (--count);
 144         }
 145 }
 146
 147 static inline void insl(unsigned long addr, void *buffer, int count)
 148 {
 149         if (count) {
 150                 u32 *buf = buffer;
 151                 do {
 152                         u32 x = inl(addr);
 153                         *buf++ = x;
 154                 } while (--count);
 155         }
 156 }
 157
 158 static inline void outsb(unsigned long addr, const void *buffer, int count)
 159 {
 160         if (count) {
 161                 const u8 *buf = buffer;
 162                 do {
 163                         outb(*buf++, addr);
 164                 } while (--count);
 165         }
 166 }
 167
 168 static inline void outsw(unsigned long addr, const void *buffer, int count)
 169 {
 170         if (count) {
 171                 const u16 *buf = buffer;
 172                 do {
 173                         outw(*buf++, addr);
 174                 } while (--count);
 175         }
 176 }
 177
 178 static inline void outsl(unsigned long addr, const void *buffer, int count)
 179 {
 180         if (count) {
 181                 const u32 *buf = buffer;
 182                 do {
 183                         outl(*buf++, addr);
 184                 } while (--count);
 185         }
 186 }
 187
 188 #ifndef CONFIG_GENERIC_IOMAP
 189 #define ioread8(addr)           readb(addr)
 190 #define ioread16(addr)          readw(addr)
 191 #define ioread16be(addr)        be16_to_cpu(ioread16(addr))
 192 #define ioread32(addr)          readl(addr)
 193 #define ioread32be(addr)        be32_to_cpu(ioread32(addr))
 194
 195 #define iowrite8(v, addr)       writeb((v), (addr))
 196 #define iowrite16(v, addr)      writew((v), (addr))
 197 #define iowrite16be(v, addr)    iowrite16(be16_to_cpu(v), (addr))
 198 #define iowrite32(v, addr)      writel((v), (addr))
 199 #define iowrite32be(v, addr)    iowrite32(be32_to_cpu(v), (addr))
 200
 201 #define ioread8_rep(p, dst, count) \
 202         insb((unsigned long) (p), (dst), (count))
 203 #define ioread16_rep(p, dst, count) \
 204         insw((unsigned long) (p), (dst), (count))
 205 #define ioread32_rep(p, dst, count) \
 206         insl((unsigned long) (p), (dst), (count))
 207
 208 #define iowrite8_rep(p, src, count) \
 209         outsb((unsigned long) (p), (src), (count))
 210 #define iowrite16_rep(p, src, count) \
 211         outsw((unsigned long) (p), (src), (count))
 212 #define iowrite32_rep(p, src, count) \
 213         outsl((unsigned long) (p), (src), (count))
 214 #endif /* CONFIG_GENERIC_IOMAP */
 215
 216
 217 #define IO_SPACE_LIMIT 0xffffffff
 218
 219 #ifdef __KERNEL__
 220
 221 #include <linux/vmalloc.h>
 222 #define __io_virt(x) ((void __force *) (x))
 223
 224 #ifndef CONFIG_GENERIC_IOMAP
 225 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 226 struct pci_dev;
 227 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
 228 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
 229 {
 230 }
 231 #endif /* CONFIG_GENERIC_IOMAP */
 232
 233 /*
 234  * Change virtual addresses to physical addresses and vv.
 235  * These are pretty trivial
 236  */
 237 static inline unsigned long virt_to_phys(volatile void *address)
 238 {
 239         return __pa((unsigned long)address);
 240 }
 241
 242 static inline void *phys_to_virt(unsigned long address)
 243 {
 244         return __va(address);
 245 }
 246
 247 /*
 248  * Change "struct page" to physical address.
 249  */
 250 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
 251 {
 252         return (void __iomem*) (unsigned long)offset;
 253 }
 254
 255 #define __ioremap(offset, size, flags)  ioremap(offset, size)
 256
 257 #ifndef ioremap_nocache
 258 #define ioremap_nocache ioremap
 259 #endif
 260
 261 #ifndef ioremap_wc
 262 #define ioremap_wc ioremap_nocache
 263 #endif
 264
 265 static inline void iounmap(void *addr)
 266 {
 267 }
 268
 269 #ifndef CONFIG_GENERIC_IOMAP
 270 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 271 {
 272         return (void __iomem *) port;
 273 }
 274
 275 static inline void ioport_unmap(void __iomem *p)
 276 {
 277 }
 278 #else /* CONFIG_GENERIC_IOMAP */
 279 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
 280 extern void ioport_unmap(void __iomem *p);
 281 #endif /* CONFIG_GENERIC_IOMAP */
 282
 283 #define xlate_dev_kmem_ptr(p)   p
 284 #define xlate_dev_mem_ptr(p)    ((void *) (p))
 285
 286 #ifndef virt_to_bus
 287 static inline unsigned long virt_to_bus(volatile void *address)
 288 {
 289         return ((unsigned long) address);
 290 }
 291
 292 static inline void *bus_to_virt(unsigned long address)
 293 {
 294         return (void *) address;
 295 }
 296 #endif
 297
 298 #define memset_io(a, b, c)      memset(__io_virt(a), (b), (c))
 299 #define memcpy_fromio(a, b, c)  memcpy((a), __io_virt(b), (c))
 300 #define memcpy_toio(a, b, c)    memcpy(__io_virt(a), (b), (c))
 301
 302 #endif /* __KERNEL__ */
 303
 304 #endif /* __ASM_GENERIC_IO_H */