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 static inline u8 __raw_readb(const volatile void __iomem *addr)
  47 {
  48         return __builtin_read8((volatile void __iomem *)addr);
  49 }
  50
  51 static inline u16 __raw_readw(const volatile void __iomem *addr)
  52 {
  53         return __builtin_read16((volatile void __iomem *)addr);
  54 }
  55
  56 static inline u32 __raw_readl(const volatile void __iomem *addr)
  57 {
  58         return __builtin_read32((volatile void __iomem *)addr);
  59 }
  60
  61 #define __raw_writeb(datum, addr) __builtin_write8(addr, datum)
  62 #define __raw_writew(datum, addr) __builtin_write16(addr, datum)
  63 #define __raw_writel(datum, addr) __builtin_write32(addr, datum)
  64
  65 static inline void io_outsb(unsigned int addr, const void *buf, int len)
  66 {
  67         unsigned long __ioaddr = (unsigned long) addr;
  68         const uint8_t *bp = buf;
  69
  70         while (len--)
  71                 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
  72 }
  73
  74 static inline void io_outsw(unsigned int addr, const void *buf, int len)
  75 {
  76         unsigned long __ioaddr = (unsigned long) addr;
  77         const uint16_t *bp = buf;
  78
  79         while (len--)
  80                 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
  81 }
  82
  83 extern void __outsl_ns(unsigned int addr, const void *buf, int len);
  84 extern void __outsl_sw(unsigned int addr, const void *buf, int len);
  85 static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
  86 {
  87         unsigned long __ioaddr = (unsigned long) addr;
  88
  89         if (!swap)
  90                 __outsl_ns(__ioaddr, buf, len);
  91         else
  92                 __outsl_sw(__ioaddr, buf, len);
  93 }
  94
  95 static inline void io_insb(unsigned long addr, void *buf, int len)
  96 {
  97         uint8_t *bp = buf;
  98
  99         while (len--)
 100                 *bp++ = __builtin_read8((volatile void __iomem *) addr);
 101 }
 102
 103 static inline void io_insw(unsigned long addr, void *buf, int len)
 104 {
 105         uint16_t *bp = buf;
 106
 107         while (len--)
 108                 *bp++ = __builtin_read16((volatile void __iomem *) addr);
 109 }
 110
 111 extern void __insl_ns(unsigned long addr, void *buf, int len);
 112 extern void __insl_sw(unsigned long addr, void *buf, int len);
 113 static inline void __insl(unsigned long addr, void *buf, int len, int swap)
 114 {
 115         if (!swap)
 116                 __insl_ns(addr, buf, len);
 117         else
 118                 __insl_sw(addr, buf, len);
 119 }
 120
 121 #define mmiowb() mb()
 122
 123 /*
 124  *      make the short names macros so specific devices
 125  *      can override them as required
 126  */
 127
 128 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
 129 {
 130         memset((void __force *) addr, val, count);
 131 }
 132
 133 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
 134 {
 135         memcpy(dst, (void __force *) src, count);
 136 }
 137
 138 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
 139 {
 140         memcpy((void __force *) dst, src, count);
 141 }
 142
 143 static inline uint8_t inb(unsigned long addr)
 144 {
 145         return __builtin_read8((void __iomem *)addr);
 146 }
 147
 148 static inline uint16_t inw(unsigned long addr)
 149 {
 150         uint16_t ret = __builtin_read16((void __iomem *)addr);
 151
 152         if (__is_PCI_IO(addr))
 153                 ret = _swapw(ret);
 154
 155         return ret;
 156 }
 157
 158 static inline uint32_t inl(unsigned long addr)
 159 {
 160         uint32_t ret = __builtin_read32((void __iomem *)addr);
 161
 162         if (__is_PCI_IO(addr))
 163                 ret = _swapl(ret);
 164
 165         return ret;
 166 }
 167
 168 static inline void outb(uint8_t datum, unsigned long addr)
 169 {
 170         __builtin_write8((void __iomem *)addr, datum);
 171 }
 172
 173 static inline void outw(uint16_t datum, unsigned long addr)
 174 {
 175         if (__is_PCI_IO(addr))
 176                 datum = _swapw(datum);
 177         __builtin_write16((void __iomem *)addr, datum);
 178 }
 179
 180 static inline void outl(uint32_t datum, unsigned long addr)
 181 {
 182         if (__is_PCI_IO(addr))
 183                 datum = _swapl(datum);
 184         __builtin_write32((void __iomem *)addr, datum);
 185 }
 186
 187 #define inb_p(addr)     inb(addr)
 188 #define inw_p(addr)     inw(addr)
 189 #define inl_p(addr)     inl(addr)
 190 #define outb_p(x,addr)  outb(x,addr)
 191 #define outw_p(x,addr)  outw(x,addr)
 192 #define outl_p(x,addr)  outl(x,addr)
 193
 194 #define outsb(a,b,l)    io_outsb(a,b,l)
 195 #define outsw(a,b,l)    io_outsw(a,b,l)
 196 #define outsl(a,b,l)    __outsl(a,b,l,0)
 197
 198 #define insb(a,b,l)     io_insb(a,b,l)
 199 #define insw(a,b,l)     io_insw(a,b,l)
 200 #define insl(a,b,l)     __insl(a,b,l,0)
 201
 202 #define IO_SPACE_LIMIT  0xffffffff
 203
 204 static inline uint8_t readb(const volatile void __iomem *addr)
 205 {
 206         return __builtin_read8((__force void volatile __iomem *) addr);
 207 }
 208
 209 static inline uint16_t readw(const volatile void __iomem *addr)
 210 {
 211         uint16_t ret =  __builtin_read16((__force void volatile __iomem *)addr);
 212
 213         if (__is_PCI_MEM(addr))
 214                 ret = _swapw(ret);
 215         return ret;
 216 }
 217
 218 static inline uint32_t readl(const volatile void __iomem *addr)
 219 {
 220         uint32_t ret =  __builtin_read32((__force void volatile __iomem *)addr);
 221
 222         if (__is_PCI_MEM(addr))
 223                 ret = _swapl(ret);
 224
 225         return ret;
 226 }
 227
 228 #define readb_relaxed readb
 229 #define readw_relaxed readw
 230 #define readl_relaxed readl
 231
 232 static inline void writeb(uint8_t datum, volatile void __iomem *addr)
 233 {
 234         __builtin_write8(addr, datum);
 235         if (__is_PCI_MEM(addr))
 236                 __flush_PCI_writes();
 237 }
 238
 239 static inline void writew(uint16_t datum, volatile void __iomem *addr)
 240 {
 241         if (__is_PCI_MEM(addr))
 242                 datum = _swapw(datum);
 243
 244         __builtin_write16(addr, datum);
 245         if (__is_PCI_MEM(addr))
 246                 __flush_PCI_writes();
 247 }
 248
 249 static inline void writel(uint32_t datum, volatile void __iomem *addr)
 250 {
 251         if (__is_PCI_MEM(addr))
 252                 datum = _swapl(datum);
 253
 254         __builtin_write32(addr, datum);
 255         if (__is_PCI_MEM(addr))
 256                 __flush_PCI_writes();
 257 }
 258
 259 #define writeb_relaxed writeb
 260 #define writew_relaxed writew
 261 #define writel_relaxed writel
 262
 263 /* Values for nocacheflag and cmode */
 264 #define IOMAP_FULL_CACHING              0
 265 #define IOMAP_NOCACHE_SER               1
 266 #define IOMAP_NOCACHE_NONSER            2
 267 #define IOMAP_WRITETHROUGH              3
 268
 269 extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
 270
 271 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
 272 {
 273         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 274 }
 275
 276 static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
 277 {
 278         return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 279 }
 280
 281 static inline void __iomem *ioremap_wt(unsigned long physaddr, unsigned long size)
 282 {
 283         return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
 284 }
 285
 286 static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
 287 {
 288         return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
 289 }
 290
 291 #define ioremap_wc ioremap_nocache
 292 #define ioremap_uc ioremap_nocache
 293
 294 extern void iounmap(void volatile __iomem *addr);
 295
 296 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 297 {
 298         return (void __iomem *) port;
 299 }
 300
 301 static inline void ioport_unmap(void __iomem *p)
 302 {
 303 }
 304
 305 static inline void flush_write_buffers(void)
 306 {
 307         __asm__ __volatile__ ("membar" : : :"memory");
 308 }
 309
 310 /*
 311  * do appropriate I/O accesses for token type
 312  */
 313 static inline unsigned int ioread8(void __iomem *p)
 314 {
 315         return __builtin_read8(p);
 316 }
 317
 318 static inline unsigned int ioread16(void __iomem *p)
 319 {
 320         uint16_t ret = __builtin_read16(p);
 321         if (__is_PCI_addr(p))
 322                 ret = _swapw(ret);
 323         return ret;
 324 }
 325
 326 static inline unsigned int ioread32(void __iomem *p)
 327 {
 328         uint32_t ret = __builtin_read32(p);
 329         if (__is_PCI_addr(p))
 330                 ret = _swapl(ret);
 331         return ret;
 332 }
 333
 334 static inline void iowrite8(u8 val, void __iomem *p)
 335 {
 336         __builtin_write8(p, val);
 337         if (__is_PCI_MEM(p))
 338                 __flush_PCI_writes();
 339 }
 340
 341 static inline void iowrite16(u16 val, void __iomem *p)
 342 {
 343         if (__is_PCI_addr(p))
 344                 val = _swapw(val);
 345         __builtin_write16(p, val);
 346         if (__is_PCI_MEM(p))
 347                 __flush_PCI_writes();
 348 }
 349
 350 static inline void iowrite32(u32 val, void __iomem *p)
 351 {
 352         if (__is_PCI_addr(p))
 353                 val = _swapl(val);
 354         __builtin_write32(p, val);
 355         if (__is_PCI_MEM(p))
 356                 __flush_PCI_writes();
 357 }
 358
 359 #define ioread16be(addr)        be16_to_cpu(ioread16(addr))
 360 #define ioread32be(addr)        be32_to_cpu(ioread32(addr))
 361 #define iowrite16be(v, addr)    iowrite16(cpu_to_be16(v), (addr))
 362 #define iowrite32be(v, addr)    iowrite32(cpu_to_be32(v), (addr))
 363
 364 static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
 365 {
 366         io_insb((unsigned long) p, dst, count);
 367 }
 368
 369 static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
 370 {
 371         io_insw((unsigned long) p, dst, count);
 372 }
 373
 374 static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
 375 {
 376         __insl_ns((unsigned long) p, dst, count);
 377 }
 378
 379 static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
 380 {
 381         io_outsb((unsigned long) p, src, count);
 382 }
 383
 384 static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
 385 {
 386         io_outsw((unsigned long) p, src, count);
 387 }
 388
 389 static inline void iowrite32_rep(void __iomem *p, const void *src, unsigned long count)
 390 {
 391         __outsl_ns((unsigned long) p, src, count);
 392 }
 393
 394 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 395 struct pci_dev;
 396 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
 397 {
 398 }
 399
 400
 401 /*
 402  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 403  * access
 404  */
 405 #define xlate_dev_mem_ptr(p)    __va(p)
 406
 407 /*
 408  * Convert a virtual cached pointer to an uncached pointer
 409  */
 410 #define xlate_dev_kmem_ptr(p)   p
 411
 412 #endif /* __KERNEL__ */
 413
 414 #endif /* _ASM_IO_H */