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