include/asm-mn10300/io.h

   1 /* MN10300 I/O port emulation and memory-mapped I/O
   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_IO_H
  12 #define _ASM_IO_H
  13
  14 #include <asm/page.h> /* I/O is all done through memory accesses */
  15 #include <asm/cpu-regs.h>
  16 #include <asm/cacheflush.h>
  17
  18 #define mmiowb() do {} while (0)
  19
  20 /*****************************************************************************/
  21 /*
  22  * readX/writeX() are used to access memory mapped devices. On some
  23  * architectures the memory mapped IO stuff needs to be accessed
  24  * differently. On the x86 architecture, we just read/write the
  25  * memory location directly.
  26  */
  27 static inline u8 readb(const volatile void __iomem *addr)
  28 {
  29         return *(const volatile u8 *) addr;
  30 }
  31
  32 static inline u16 readw(const volatile void __iomem *addr)
  33 {
  34         return *(const volatile u16 *) addr;
  35 }
  36
  37 static inline u32 readl(const volatile void __iomem *addr)
  38 {
  39         return *(const volatile u32 *) addr;
  40 }
  41
  42 #define __raw_readb readb
  43 #define __raw_readw readw
  44 #define __raw_readl readl
  45
  46 #define readb_relaxed readb
  47 #define readw_relaxed readw
  48 #define readl_relaxed readl
  49
  50 static inline void writeb(u8 b, volatile void __iomem *addr)
  51 {
  52         *(volatile u8 *) addr = b;
  53 }
  54
  55 static inline void writew(u16 b, volatile void __iomem *addr)
  56 {
  57         *(volatile u16 *) addr = b;
  58 }
  59
  60 static inline void writel(u32 b, volatile void __iomem *addr)
  61 {
  62         *(volatile u32 *) addr = b;
  63 }
  64
  65 #define __raw_writeb writeb
  66 #define __raw_writew writew
  67 #define __raw_writel writel
  68
  69 /*****************************************************************************/
  70 /*
  71  * traditional input/output functions
  72  */
  73 static inline u8 inb_local(unsigned long addr)
  74 {
  75         return readb((volatile void __iomem *) addr);
  76 }
  77
  78 static inline void outb_local(u8 b, unsigned long addr)
  79 {
  80         return writeb(b, (volatile void __iomem *) addr);
  81 }
  82
  83 static inline u8 inb(unsigned long addr)
  84 {
  85         return readb((volatile void __iomem *) addr);
  86 }
  87
  88 static inline u16 inw(unsigned long addr)
  89 {
  90         return readw((volatile void __iomem *) addr);
  91 }
  92
  93 static inline u32 inl(unsigned long addr)
  94 {
  95         return readl((volatile void __iomem *) addr);
  96 }
  97
  98 static inline void outb(u8 b, unsigned long addr)
  99 {
 100         return writeb(b, (volatile void __iomem *) addr);
 101 }
 102
 103 static inline void outw(u16 b, unsigned long addr)
 104 {
 105         return writew(b, (volatile void __iomem *) addr);
 106 }
 107
 108 static inline void outl(u32 b, unsigned long addr)
 109 {
 110         return writel(b, (volatile void __iomem *) addr);
 111 }
 112
 113 #define inb_p(addr)     inb(addr)
 114 #define inw_p(addr)     inw(addr)
 115 #define inl_p(addr)     inl(addr)
 116 #define outb_p(x, addr) outb((x), (addr))
 117 #define outw_p(x, addr) outw((x), (addr))
 118 #define outl_p(x, addr) outl((x), (addr))
 119
 120 static inline void insb(unsigned long addr, void *buffer, int count)
 121 {
 122         if (count) {
 123                 u8 *buf = buffer;
 124                 do {
 125                         u8 x = inb(addr);
 126                         *buf++ = x;
 127                 } while (--count);
 128         }
 129 }
 130
 131 static inline void insw(unsigned long addr, void *buffer, int count)
 132 {
 133         if (count) {
 134                 u16 *buf = buffer;
 135                 do {
 136                         u16 x = inw(addr);
 137                         *buf++ = x;
 138                 } while (--count);
 139         }
 140 }
 141
 142 static inline void insl(unsigned long addr, void *buffer, int count)
 143 {
 144         if (count) {
 145                 u32 *buf = buffer;
 146                 do {
 147                         u32 x = inl(addr);
 148                         *buf++ = x;
 149                 } while (--count);
 150         }
 151 }
 152
 153 static inline void outsb(unsigned long addr, const void *buffer, int count)
 154 {
 155         if (count) {
 156                 const u8 *buf = buffer;
 157                 do {
 158                         outb(*buf++, addr);
 159                 } while (--count);
 160         }
 161 }
 162
 163 static inline void outsw(unsigned long addr, const void *buffer, int count)
 164 {
 165         if (count) {
 166                 const u16 *buf = buffer;
 167                 do {
 168                         outw(*buf++, addr);
 169                 } while (--count);
 170         }
 171 }
 172
 173 extern void __outsl(unsigned long addr, const void *buffer, int count);
 174 static inline void outsl(unsigned long addr, const void *buffer, int count)
 175 {
 176         if ((unsigned long) buffer & 0x3)
 177                 return __outsl(addr, buffer, count);
 178
 179         if (count) {
 180                 const u32 *buf = buffer;
 181                 do {
 182                         outl(*buf++, addr);
 183                 } while (--count);
 184         }
 185 }
 186
 187 #define ioread8(addr)           readb(addr)
 188 #define ioread16(addr)          readw(addr)
 189 #define ioread32(addr)          readl(addr)
 190
 191 #define iowrite8(v, addr)       writeb((v), (addr))
 192 #define iowrite16(v, addr)      writew((v), (addr))
 193 #define iowrite32(v, addr)      writel((v), (addr))
 194
 195 #define ioread8_rep(p, dst, count) \
 196         insb((unsigned long) (p), (dst), (count))
 197 #define ioread16_rep(p, dst, count) \
 198         insw((unsigned long) (p), (dst), (count))
 199 #define ioread32_rep(p, dst, count) \
 200         insl((unsigned long) (p), (dst), (count))
 201
 202 #define iowrite8_rep(p, src, count) \
 203         outsb((unsigned long) (p), (src), (count))
 204 #define iowrite16_rep(p, src, count) \
 205         outsw((unsigned long) (p), (src), (count))
 206 #define iowrite32_rep(p, src, count) \
 207         outsl((unsigned long) (p), (src), (count))
 208
 209
 210 #define IO_SPACE_LIMIT 0xffffffff
 211
 212 #ifdef __KERNEL__
 213
 214 #include <linux/vmalloc.h>
 215 #define __io_virt(x) ((void *) (x))
 216
 217 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 218 struct pci_dev;
 219 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
 220 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
 221 {
 222 }
 223
 224 /*
 225  * Change virtual addresses to physical addresses and vv.
 226  * These are pretty trivial
 227  */
 228 static inline unsigned long virt_to_phys(volatile void *address)
 229 {
 230         return __pa(address);
 231 }
 232
 233 static inline void *phys_to_virt(unsigned long address)
 234 {
 235         return __va(address);
 236 }
 237
 238 /*
 239  * Change "struct page" to physical address.
 240  */
 241 static inline void *__ioremap(unsigned long offset, unsigned long size,
 242                               unsigned long flags)
 243 {
 244         return (void *) offset;
 245 }
 246
 247 static inline void *ioremap(unsigned long offset, unsigned long size)
 248 {
 249         return (void *) offset;
 250 }
 251
 252 /*
 253  * This one maps high address device memory and turns off caching for that
 254  * area.  it's useful if some control registers are in such an area and write
 255  * combining or read caching is not desirable:
 256  */
 257 static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
 258 {
 259         return (void *) (offset | 0x20000000);
 260 }
 261
 262 #define ioremap_wc ioremap_nocache
 263
 264 static inline void iounmap(void *addr)
 265 {
 266 }
 267
 268 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 269 {
 270         return (void __iomem *) port;
 271 }
 272
 273 static inline void ioport_unmap(void __iomem *p)
 274 {
 275 }
 276
 277 #define xlate_dev_kmem_ptr(p)   ((void *) (p))
 278 #define xlate_dev_mem_ptr(p)    ((void *) (p))
 279
 280 /*
 281  * PCI bus iomem addresses must be in the region 0x80000000-0x9fffffff
 282  */
 283 static inline unsigned long virt_to_bus(volatile void *address)
 284 {
 285         return ((unsigned long) address) & ~0x20000000;
 286 }
 287
 288 static inline void *bus_to_virt(unsigned long address)
 289 {
 290         return (void *) address;
 291 }
 292
 293 #define page_to_bus page_to_phys
 294
 295 #define memset_io(a, b, c)      memset(__io_virt(a), (b), (c))
 296 #define memcpy_fromio(a, b, c)  memcpy((a), __io_virt(b), (c))
 297 #define memcpy_toio(a, b, c)    memcpy(__io_virt(a), (b), (c))
 298
 299 #endif /* __KERNEL__ */
 300
 301 #endif /* _ASM_IO_H */