arch/frv/include/asm/io.h

   1 /* io.h: FRV I/O operations
   2  *
   3  * Copyright (C) 2004 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 License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  * This gets interesting when talking to the PCI bus - the CPU is in big endian
  12  * mode, the PCI bus is little endian and the hardware in the middle can do
  13  * byte swapping
  14  */
  15 #ifndef _ASM_IO_H
  16 #define _ASM_IO_H
  17
  18 #ifdef __KERNEL__
  19
  20 #define ARCH_HAS_IOREMAP_WT
  21
  22 #include <linux/types.h>
  23 #include <asm/virtconvert.h>
  24 #include <asm/string.h>
  25 #include <asm/mb-regs.h>
  26 #include <asm-generic/pci_iomap.h>
  27 #include <linux/delay.h>
  28
  29 /*
  30  * swap functions are sometimes needed to interface little-endian hardware
  31  */
  32
  33 static inline unsigned short _swapw(unsigned short v)
  34 {
  35     return ((v << 8) | (v >> 8));
  36 }
  37
  38 static inline unsigned long _swapl(unsigned long v)
  39 {
  40     return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
  41 }
  42
  43 //#define __iormb() asm volatile("membar")
  44 //#define __iowmb() asm volatile("membar")
  45
  46 #define __raw_readb __builtin_read8
  47 #define __raw_readw __builtin_read16
  48 #define __raw_readl __builtin_read32
  49
  50 #define __raw_writeb(datum, addr) __builtin_write8(addr, datum)
  51 #define __raw_writew(datum, addr) __builtin_write16(addr, datum)
  52 #define __raw_writel(datum, addr) __builtin_write32(addr, datum)
  53
  54 static inline void io_outsb(unsigned int addr, const void *buf, int len)
  55 {
  56         unsigned long __ioaddr = (unsigned long) addr;
  57         const uint8_t *bp = buf;
  58
  59         while (len--)
  60                 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
  61 }
  62
  63 static inline void io_outsw(unsigned int addr, const void *buf, int len)
  64 {
  65         unsigned long __ioaddr = (unsigned long) addr;
  66         const uint16_t *bp = buf;
  67
  68         while (len--)
  69                 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
  70 }
  71
  72 extern void __outsl_ns(unsigned int addr, const void *buf, int len);
  73 extern void __outsl_sw(unsigned int addr, const void *buf, int len);
  74 static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
  75 {
  76         unsigned long __ioaddr = (unsigned long) addr;
  77
  78         if (!swap)
  79                 __outsl_ns(__ioaddr, buf, len);
  80         else
  81                 __outsl_sw(__ioaddr, buf, len);
  82 }
  83
  84 static inline void io_insb(unsigned long addr, void *buf, int len)
  85 {
  86         uint8_t *bp = buf;
  87
  88         while (len--)
  89                 *bp++ = __builtin_read8((volatile void __iomem *) addr);
  90 }
  91
  92 static inline void io_insw(unsigned long addr, void *buf, int len)
  93 {
  94         uint16_t *bp = buf;
  95
  96         while (len--)
  97                 *bp++ = __builtin_read16((volatile void __iomem *) addr);
  98 }
  99
 100 extern void __insl_ns(unsigned long addr, void *buf, int len);
 101 extern void __insl_sw(unsigned long addr, void *buf, int len);
 102 static inline void __insl(unsigned long addr, void *buf, int len, int swap)
 103 {
 104         if (!swap)
 105                 __insl_ns(addr, buf, len);
 106         else
 107                 __insl_sw(addr, buf, len);
 108 }
 109
 110 #define mmiowb() mb()
 111
 112 /*
 113  *      make the short names macros so specific devices
 114  *      can override them as required
 115  */
 116
 117 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
 118 {
 119         memset((void __force *) addr, val, count);
 120 }
 121
 122 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
 123 {
 124         memcpy(dst, (void __force *) src, count);
 125 }
 126
 127 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
 128 {
 129         memcpy((void __force *) dst, src, count);
 130 }
 131
 132 static inline uint8_t inb(unsigned long addr)
 133 {
 134         return __builtin_read8((void __iomem *)addr);
 135 }
 136
 137 static inline uint16_t inw(unsigned long addr)
 138 {
 139         uint16_t ret = __builtin_read16((void __iomem *)addr);
 140
 141         if (__is_PCI_IO(addr))
 142                 ret = _swapw(ret);
 143
 144         return ret;
 145 }
 146
 147 static inline uint32_t inl(unsigned long addr)
 148 {
 149         uint32_t ret = __builtin_read32((void __iomem *)addr);
 150
 151         if (__is_PCI_IO(addr))
 152                 ret = _swapl(ret);
 153
 154         return ret;
 155 }
 156
 157 static inline void outb(uint8_t datum, unsigned long addr)
 158 {
 159         __builtin_write8((void __iomem *)addr, datum);
 160 }
 161
 162 static inline void outw(uint16_t datum, unsigned long addr)
 163 {
 164         if (__is_PCI_IO(addr))
 165                 datum = _swapw(datum);
 166         __builtin_write16((void __iomem *)addr, datum);
 167 }
 168
 169 static inline void outl(uint32_t datum, unsigned long addr)
 170 {
 171         if (__is_PCI_IO(addr))
 172                 datum = _swapl(datum);
 173         __builtin_write32((void __iomem *)addr, datum);
 174 }
 175
 176 #define inb_p(addr)     inb(addr)
 177 #define inw_p(addr)     inw(addr)
 178 #define inl_p(addr)     inl(addr)
 179 #define outb_p(x,addr)  outb(x,addr)
 180 #define outw_p(x,addr)  outw(x,addr)
 181 #define outl_p(x,addr)  outl(x,addr)
 182
 183 #define outsb(a,b,l)    io_outsb(a,b,l)
 184 #define outsw(a,b,l)    io_outsw(a,b,l)
 185 #define outsl(a,b,l)    __outsl(a,b,l,0)
 186
 187 #define insb(a,b,l)     io_insb(a,b,l)
 188 #define insw(a,b,l)     io_insw(a,b,l)
 189 #define insl(a,b,l)     __insl(a,b,l,0)
 190
 191 #define IO_SPACE_LIMIT  0xffffffff
 192
 193 static inline uint8_t readb(const volatile void __iomem *addr)
 194 {
 195         return __builtin_read8((__force void volatile __iomem *) addr);
 196 }
 197
 198 static inline uint16_t readw(const volatile void __iomem *addr)
 199 {
 200         uint16_t ret =  __builtin_read16((__force void volatile __iomem *)addr);
 201
 202         if (__is_PCI_MEM(addr))
 203                 ret = _swapw(ret);
 204         return ret;
 205 }
 206
 207 static inline uint32_t readl(const volatile void __iomem *addr)
 208 {
 209         uint32_t ret =  __builtin_read32((__force void volatile __iomem *)addr);
 210
 211         if (__is_PCI_MEM(addr))
 212                 ret = _swapl(ret);
 213
 214         return ret;
 215 }
 216
 217 #define readb_relaxed readb
 218 #define readw_relaxed readw
 219 #define readl_relaxed readl
 220
 221 static inline void writeb(uint8_t datum, volatile void __iomem *addr)
 222 {
 223         __builtin_write8(addr, datum);
 224         if (__is_PCI_MEM(addr))
 225                 __flush_PCI_writes();
 226 }
 227
 228 static inline void writew(uint16_t datum, volatile void __iomem *addr)
 229 {
 230         if (__is_PCI_MEM(addr))
 231                 datum = _swapw(datum);
 232
 233         __builtin_write16(addr, datum);
 234         if (__is_PCI_MEM(addr))
 235                 __flush_PCI_writes();
 236 }
 237
 238 static inline void writel(uint32_t datum, volatile void __iomem *addr)
 239 {
 240         if (__is_PCI_MEM(addr))
 241                 datum = _swapl(datum);
 242
 243         __builtin_write32(addr, datum);
 244         if (__is_PCI_MEM(addr))
 245                 __flush_PCI_writes();
 246 }
 247
 248 #define writeb_relaxed writeb
 249 #define writew_relaxed writew
 250 #define writel_relaxed writel
 251
 252 /* Values for nocacheflag and cmode */
 253 #define IOMAP_FULL_CACHING              0
 254 #define IOMAP_NOCACHE_SER               1
 255 #define IOMAP_NOCACHE_NONSER            2
 256 #define IOMAP_WRITETHROUGH              3
 257
 258 extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
 259
 260 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
 261 {
 262         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 263 }
 264
 265 static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
 266 {
 267         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 268 }
 269
 270 static inline void __iomem *ioremap_wt(unsigned long physaddr, unsigned long size)
 271 {
 272         return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
 273 }
 274
 275 static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
 276 {
 277         return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
 278 }
 279
 280 #define ioremap_wc ioremap_nocache
 281
 282 extern void iounmap(void volatile __iomem *addr);
 283
 284 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 285 {
 286         return (void __iomem *) port;
 287 }
 288
 289 static inline void ioport_unmap(void __iomem *p)
 290 {
 291 }
 292
 293 static inline void flush_write_buffers(void)
 294 {
 295         __asm__ __volatile__ ("membar" : : :"memory");
 296 }
 297
 298 /*
 299  * do appropriate I/O accesses for token type
 300  */
 301 static inline unsigned int ioread8(void __iomem *p)
 302 {
 303         return __builtin_read8(p);
 304 }
 305
 306 static inline unsigned int ioread16(void __iomem *p)
 307 {
 308         uint16_t ret = __builtin_read16(p);
 309         if (__is_PCI_addr(p))
 310                 ret = _swapw(ret);
 311         return ret;
 312 }
 313
 314 static inline unsigned int ioread32(void __iomem *p)
 315 {
 316         uint32_t ret = __builtin_read32(p);
 317         if (__is_PCI_addr(p))
 318                 ret = _swapl(ret);
 319         return ret;
 320 }
 321
 322 static inline void iowrite8(u8 val, void __iomem *p)
 323 {
 324         __builtin_write8(p, val);
 325         if (__is_PCI_MEM(p))
 326                 __flush_PCI_writes();
 327 }
 328
 329 static inline void iowrite16(u16 val, void __iomem *p)
 330 {
 331         if (__is_PCI_addr(p))
 332                 val = _swapw(val);
 333         __builtin_write16(p, val);
 334         if (__is_PCI_MEM(p))
 335                 __flush_PCI_writes();
 336 }
 337
 338 static inline void iowrite32(u32 val, void __iomem *p)
 339 {
 340         if (__is_PCI_addr(p))
 341                 val = _swapl(val);
 342         __builtin_write32(p, val);
 343         if (__is_PCI_MEM(p))
 344                 __flush_PCI_writes();
 345 }
 346
 347 #define ioread16be(addr)        be16_to_cpu(ioread16(addr))
 348 #define ioread32be(addr)        be32_to_cpu(ioread32(addr))
 349 #define iowrite16be(v, addr)    iowrite16(cpu_to_be16(v), (addr))
 350 #define iowrite32be(v, addr)    iowrite32(cpu_to_be32(v), (addr))
 351
 352 static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
 353 {
 354         io_insb((unsigned long) p, dst, count);
 355 }
 356
 357 static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
 358 {
 359         io_insw((unsigned long) p, dst, count);
 360 }
 361
 362 static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
 363 {
 364         __insl_ns((unsigned long) p, dst, count);
 365 }
 366
 367 static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
 368 {
 369         io_outsb((unsigned long) p, src, count);
 370 }
 371
 372 static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
 373 {
 374         io_outsw((unsigned long) p, src, count);
 375 }
 376
 377 static inline void iowrite32_rep(void __iomem *p, const void *src, unsigned long count)
 378 {
 379         __outsl_ns((unsigned long) p, src, count);
 380 }
 381
 382 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 383 struct pci_dev;
 384 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
 385 {
 386 }
 387
 388
 389 /*
 390  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 391  * access
 392  */
 393 #define xlate_dev_mem_ptr(p)    __va(p)
 394
 395 /*
 396  * Convert a virtual cached pointer to an uncached pointer
 397  */
 398 #define xlate_dev_kmem_ptr(p)   p
 399
 400 #endif /* __KERNEL__ */
 401
 402 #endif /* _ASM_IO_H */