include/asm-frv/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 #include <linux/types.h>
  21 #include <asm/virtconvert.h>
  22 #include <asm/string.h>
  23 #include <asm/mb-regs.h>
  24 #include <linux/delay.h>
  25
  26 /*
  27  * swap functions are sometimes needed to interface little-endian hardware
  28  */
  29
  30 static inline unsigned short _swapw(unsigned short v)
  31 {
  32     return ((v << 8) | (v >> 8));
  33 }
  34
  35 static inline unsigned long _swapl(unsigned long v)
  36 {
  37     return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
  38 }
  39
  40 //#define __iormb() asm volatile("membar")
  41 //#define __iowmb() asm volatile("membar")
  42
  43 #define __raw_readb __builtin_read8
  44 #define __raw_readw __builtin_read16
  45 #define __raw_readl __builtin_read32
  46
  47 #define __raw_writeb(datum, addr) __builtin_write8(addr, datum)
  48 #define __raw_writew(datum, addr) __builtin_write16(addr, datum)
  49 #define __raw_writel(datum, addr) __builtin_write32(addr, datum)
  50
  51 static inline void io_outsb(unsigned int addr, const void *buf, int len)
  52 {
  53         unsigned long __ioaddr = (unsigned long) addr;
  54         const uint8_t *bp = buf;
  55
  56         while (len--)
  57                 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
  58 }
  59
  60 static inline void io_outsw(unsigned int addr, const void *buf, int len)
  61 {
  62         unsigned long __ioaddr = (unsigned long) addr;
  63         const uint16_t *bp = buf;
  64
  65         while (len--)
  66                 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
  67 }
  68
  69 extern void __outsl_ns(unsigned int addr, const void *buf, int len);
  70 extern void __outsl_sw(unsigned int addr, const void *buf, int len);
  71 static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
  72 {
  73         unsigned long __ioaddr = (unsigned long) addr;
  74
  75         if (!swap)
  76                 __outsl_ns(__ioaddr, buf, len);
  77         else
  78                 __outsl_sw(__ioaddr, buf, len);
  79 }
  80
  81 static inline void io_insb(unsigned long addr, void *buf, int len)
  82 {
  83         uint8_t *bp = buf;
  84
  85         while (len--)
  86                 *bp++ = __builtin_read8((volatile void __iomem *) addr);
  87 }
  88
  89 static inline void io_insw(unsigned long addr, void *buf, int len)
  90 {
  91         uint16_t *bp = buf;
  92
  93         while (len--)
  94                 *bp++ = __builtin_read16((volatile void __iomem *) addr);
  95 }
  96
  97 extern void __insl_ns(unsigned long addr, void *buf, int len);
  98 extern void __insl_sw(unsigned long addr, void *buf, int len);
  99 static inline void __insl(unsigned long addr, void *buf, int len, int swap)
 100 {
 101         if (!swap)
 102                 __insl_ns(addr, buf, len);
 103         else
 104                 __insl_sw(addr, buf, len);
 105 }
 106
 107 #define mmiowb() mb()
 108
 109 /*
 110  *      make the short names macros so specific devices
 111  *      can override them as required
 112  */
 113
 114 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
 115 {
 116         memset((void __force *) addr, val, count);
 117 }
 118
 119 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
 120 {
 121         memcpy(dst, (void __force *) src, count);
 122 }
 123
 124 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
 125 {
 126         memcpy((void __force *) dst, src, count);
 127 }
 128
 129 static inline uint8_t inb(unsigned long addr)
 130 {
 131         return __builtin_read8((void __iomem *)addr);
 132 }
 133
 134 static inline uint16_t inw(unsigned long addr)
 135 {
 136         uint16_t ret = __builtin_read16((void __iomem *)addr);
 137
 138         if (__is_PCI_IO(addr))
 139                 ret = _swapw(ret);
 140
 141         return ret;
 142 }
 143
 144 static inline uint32_t inl(unsigned long addr)
 145 {
 146         uint32_t ret = __builtin_read32((void __iomem *)addr);
 147
 148         if (__is_PCI_IO(addr))
 149                 ret = _swapl(ret);
 150
 151         return ret;
 152 }
 153
 154 static inline void outb(uint8_t datum, unsigned long addr)
 155 {
 156         __builtin_write8((void __iomem *)addr, datum);
 157 }
 158
 159 static inline void outw(uint16_t datum, unsigned long addr)
 160 {
 161         if (__is_PCI_IO(addr))
 162                 datum = _swapw(datum);
 163         __builtin_write16((void __iomem *)addr, datum);
 164 }
 165
 166 static inline void outl(uint32_t datum, unsigned long addr)
 167 {
 168         if (__is_PCI_IO(addr))
 169                 datum = _swapl(datum);
 170         __builtin_write32((void __iomem *)addr, datum);
 171 }
 172
 173 #define inb_p(addr)     inb(addr)
 174 #define inw_p(addr)     inw(addr)
 175 #define inl_p(addr)     inl(addr)
 176 #define outb_p(x,addr)  outb(x,addr)
 177 #define outw_p(x,addr)  outw(x,addr)
 178 #define outl_p(x,addr)  outl(x,addr)
 179
 180 #define outsb(a,b,l)    io_outsb(a,b,l)
 181 #define outsw(a,b,l)    io_outsw(a,b,l)
 182 #define outsl(a,b,l)    __outsl(a,b,l,0)
 183
 184 #define insb(a,b,l)     io_insb(a,b,l)
 185 #define insw(a,b,l)     io_insw(a,b,l)
 186 #define insl(a,b,l)     __insl(a,b,l,0)
 187
 188 #define IO_SPACE_LIMIT  0xffffffff
 189
 190 static inline uint8_t readb(const volatile void __iomem *addr)
 191 {
 192         return __builtin_read8((__force void volatile __iomem *) addr);
 193 }
 194
 195 static inline uint16_t readw(const volatile void __iomem *addr)
 196 {
 197         uint16_t ret =  __builtin_read16((__force void volatile __iomem *)addr);
 198
 199         if (__is_PCI_MEM(addr))
 200                 ret = _swapw(ret);
 201         return ret;
 202 }
 203
 204 static inline uint32_t readl(const volatile void __iomem *addr)
 205 {
 206         uint32_t ret =  __builtin_read32((__force void volatile __iomem *)addr);
 207
 208         if (__is_PCI_MEM(addr))
 209                 ret = _swapl(ret);
 210
 211         return ret;
 212 }
 213
 214 #define readb_relaxed readb
 215 #define readw_relaxed readw
 216 #define readl_relaxed readl
 217
 218 static inline void writeb(uint8_t datum, volatile void __iomem *addr)
 219 {
 220         __builtin_write8(addr, datum);
 221         if (__is_PCI_MEM(addr))
 222                 __flush_PCI_writes();
 223 }
 224
 225 static inline void writew(uint16_t datum, volatile void __iomem *addr)
 226 {
 227         if (__is_PCI_MEM(addr))
 228                 datum = _swapw(datum);
 229
 230         __builtin_write16(addr, datum);
 231         if (__is_PCI_MEM(addr))
 232                 __flush_PCI_writes();
 233 }
 234
 235 static inline void writel(uint32_t datum, volatile void __iomem *addr)
 236 {
 237         if (__is_PCI_MEM(addr))
 238                 datum = _swapl(datum);
 239
 240         __builtin_write32(addr, datum);
 241         if (__is_PCI_MEM(addr))
 242                 __flush_PCI_writes();
 243 }
 244
 245
 246 /* Values for nocacheflag and cmode */
 247 #define IOMAP_FULL_CACHING              0
 248 #define IOMAP_NOCACHE_SER               1
 249 #define IOMAP_NOCACHE_NONSER            2
 250 #define IOMAP_WRITETHROUGH              3
 251
 252 extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
 253
 254 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
 255 {
 256         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 257 }
 258
 259 static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
 260 {
 261         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 262 }
 263
 264 static inline void __iomem *ioremap_writethrough(unsigned long physaddr, unsigned long size)
 265 {
 266         return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
 267 }
 268
 269 static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
 270 {
 271         return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
 272 }
 273
 274 extern void iounmap(void volatile __iomem *addr);
 275
 276 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 277 {
 278         return (void __iomem *) port;
 279 }
 280
 281 static inline void ioport_unmap(void __iomem *p)
 282 {
 283 }
 284
 285 static inline void flush_write_buffers(void)
 286 {
 287         __asm__ __volatile__ ("membar" : : :"memory");
 288 }
 289
 290 /*
 291  * do appropriate I/O accesses for token type
 292  */
 293 static inline unsigned int ioread8(void __iomem *p)
 294 {
 295         return __builtin_read8(p);
 296 }
 297
 298 static inline unsigned int ioread16(void __iomem *p)
 299 {
 300         uint16_t ret = __builtin_read16(p);
 301         if (__is_PCI_addr(p))
 302                 ret = _swapw(ret);
 303         return ret;
 304 }
 305
 306 static inline unsigned int ioread32(void __iomem *p)
 307 {
 308         uint32_t ret = __builtin_read32(p);
 309         if (__is_PCI_addr(p))
 310                 ret = _swapl(ret);
 311         return ret;
 312 }
 313
 314 static inline void iowrite8(u8 val, void __iomem *p)
 315 {
 316         __builtin_write8(p, val);
 317         if (__is_PCI_MEM(p))
 318                 __flush_PCI_writes();
 319 }
 320
 321 static inline void iowrite16(u16 val, void __iomem *p)
 322 {
 323         if (__is_PCI_addr(p))
 324                 val = _swapw(val);
 325         __builtin_write16(p, val);
 326         if (__is_PCI_MEM(p))
 327                 __flush_PCI_writes();
 328 }
 329
 330 static inline void iowrite32(u32 val, void __iomem *p)
 331 {
 332         if (__is_PCI_addr(p))
 333                 val = _swapl(val);
 334         __builtin_write32(p, val);
 335         if (__is_PCI_MEM(p))
 336                 __flush_PCI_writes();
 337 }
 338
 339 static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
 340 {
 341         io_insb((unsigned long) p, dst, count);
 342 }
 343
 344 static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
 345 {
 346         io_insw((unsigned long) p, dst, count);
 347 }
 348
 349 static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
 350 {
 351         __insl_ns((unsigned long) p, dst, count);
 352 }
 353
 354 static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
 355 {
 356         io_outsb((unsigned long) p, src, count);
 357 }
 358
 359 static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
 360 {
 361         io_outsw((unsigned long) p, src, count);
 362 }
 363
 364 static inline void iowrite32_rep(void __iomem *p, const void *src, unsigned long count)
 365 {
 366         __outsl_ns((unsigned long) p, src, count);
 367 }
 368
 369 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 370 struct pci_dev;
 371 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
 372 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
 373 {
 374 }
 375
 376
 377 /*
 378  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 379  * access
 380  */
 381 #define xlate_dev_mem_ptr(p)    __va(p)
 382
 383 /*
 384  * Convert a virtual cached pointer to an uncached pointer
 385  */
 386 #define xlate_dev_kmem_ptr(p)   p
 387
 388 /*
 389  * Check BIOS signature
 390  */
 391 static inline int check_signature(volatile void __iomem *io_addr,
 392                                   const unsigned char *signature, int length)
 393 {
 394         int retval = 0;
 395
 396         do {
 397                 if (readb(io_addr) != *signature)
 398                         goto out;
 399                 io_addr++;
 400                 signature++;
 401                 length--;
 402         } while (length);
 403
 404         retval = 1;
 405 out:
 406         return retval;
 407 }
 408
 409 #endif /* __KERNEL__ */
 410
 411 #endif /* _ASM_IO_H */