include/asm-mips/io.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1994, 1995 Waldorf GmbH
   7  * Copyright (C) 1994 - 2000 Ralf Baechle
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  * Copyright (C) 2004, 2005  MIPS Technologies, Inc.  All rights reserved.
  10  *      Author: Maciej W. Rozycki <macro@mips.com>
  11  */
  12 #ifndef _ASM_IO_H
  13 #define _ASM_IO_H
  14
  15 #include <linux/config.h>
  16 #include <linux/compiler.h>
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19
  20 #include <asm/addrspace.h>
  21 #include <asm/byteorder.h>
  22 #include <asm/cpu.h>
  23 #include <asm/cpu-features.h>
  24 #include <asm/page.h>
  25 #include <asm/pgtable-bits.h>
  26 #include <asm/processor.h>
  27 #include <asm/string.h>
  28
  29 #include <ioremap.h>
  30 #include <mangle-port.h>
  31
  32 /*
  33  * Slowdown I/O port space accesses for antique hardware.
  34  */
  35 #undef CONF_SLOWDOWN_IO
  36
  37 /*
  38  * Raw operations are never swapped in software.  OTOH values that raw
  39  * operations are working on may or may not have been swapped by the bus
  40  * hardware.  An example use would be for flash memory that's used for
  41  * execute in place.
  42  */
  43 # define __raw_ioswabb(x)       (x)
  44 # define __raw_ioswabw(x)       (x)
  45 # define __raw_ioswabl(x)       (x)
  46 # define __raw_ioswabq(x)       (x)
  47 # define ____raw_ioswabq(x)     (x)
  48
  49 /*
  50  * Sane hardware offers swapping of PCI/ISA I/O space accesses in hardware;
  51  * less sane hardware forces software to fiddle with this...
  52  *
  53  * Regardless, if the host bus endianness mismatches that of PCI/ISA, then
  54  * you can't have the numerical value of data and byte addresses within
  55  * multibyte quantities both preserved at the same time.  Hence two
  56  * variations of functions: non-prefixed ones that preserve the value
  57  * and prefixed ones that preserve byte addresses.  The latters are
  58  * typically used for moving raw data between a peripheral and memory (cf.
  59  * string I/O functions), hence the "__mem_" prefix.
  60  */
  61 #if defined(CONFIG_SWAP_IO_SPACE)
  62
  63 # define ioswabb(x)             (x)
  64 # define __mem_ioswabb(x)       (x)
  65 # ifdef CONFIG_SGI_IP22
  66 /*
  67  * IP22 seems braindead enough to swap 16bits values in hardware, but
  68  * not 32bits.  Go figure... Can't tell without documentation.
  69  */
  70 #  define ioswabw(x)            (x)
  71 #  define __mem_ioswabw(x)      le16_to_cpu(x)
  72 # else
  73 #  define ioswabw(x)            le16_to_cpu(x)
  74 #  define __mem_ioswabw(x)      (x)
  75 # endif
  76 # define ioswabl(x)             le32_to_cpu(x)
  77 # define __mem_ioswabl(x)       (x)
  78 # define ioswabq(x)             le64_to_cpu(x)
  79 # define __mem_ioswabq(x)       (x)
  80
  81 #else
  82
  83 # define ioswabb(x)             (x)
  84 # define __mem_ioswabb(x)       (x)
  85 # define ioswabw(x)             (x)
  86 # define __mem_ioswabw(x)       cpu_to_le16(x)
  87 # define ioswabl(x)             (x)
  88 # define __mem_ioswabl(x)       cpu_to_le32(x)
  89 # define ioswabq(x)             (x)
  90 # define __mem_ioswabq(x)       cpu_to_le32(x)
  91
  92 #endif
  93
  94 #define IO_SPACE_LIMIT 0xffff
  95
  96 /*
  97  * On MIPS I/O ports are memory mapped, so we access them using normal
  98  * load/store instructions. mips_io_port_base is the virtual address to
  99  * which all ports are being mapped.  For sake of efficiency some code
 100  * assumes that this is an address that can be loaded with a single lui
 101  * instruction, so the lower 16 bits must be zero.  Should be true on
 102  * on any sane architecture; generic code does not use this assumption.
 103  */
 104 extern const unsigned long mips_io_port_base;
 105
 106 #define set_io_port_base(base)  \
 107         do { * (unsigned long *) &mips_io_port_base = (base); } while (0)
 108
 109 /*
 110  * Thanks to James van Artsdalen for a better timing-fix than
 111  * the two short jumps: using outb's to a nonexistent port seems
 112  * to guarantee better timings even on fast machines.
 113  *
 114  * On the other hand, I'd like to be sure of a non-existent port:
 115  * I feel a bit unsafe about using 0x80 (should be safe, though)
 116  *
 117  *              Linus
 118  *
 119  */
 120
 121 #define __SLOW_DOWN_IO \
 122         __asm__ __volatile__( \
 123                 "sb\t$0,0x80(%0)" \
 124                 : : "r" (mips_io_port_base));
 125
 126 #ifdef CONF_SLOWDOWN_IO
 127 #ifdef REALLY_SLOW_IO
 128 #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
 129 #else
 130 #define SLOW_DOWN_IO __SLOW_DOWN_IO
 131 #endif
 132 #else
 133 #define SLOW_DOWN_IO
 134 #endif
 135
 136 /*
 137  *     virt_to_phys    -       map virtual addresses to physical
 138  *     @address: address to remap
 139  *
 140  *     The returned physical address is the physical (CPU) mapping for
 141  *     the memory address given. It is only valid to use this function on
 142  *     addresses directly mapped or allocated via kmalloc.
 143  *
 144  *     This function does not give bus mappings for DMA transfers. In
 145  *     almost all conceivable cases a device driver should not be using
 146  *     this function
 147  */
 148 static inline unsigned long virt_to_phys(volatile void * address)
 149 {
 150         return (unsigned long)address - PAGE_OFFSET;
 151 }
 152
 153 /*
 154  *     phys_to_virt    -       map physical address to virtual
 155  *     @address: address to remap
 156  *
 157  *     The returned virtual address is a current CPU mapping for
 158  *     the memory address given. It is only valid to use this function on
 159  *     addresses that have a kernel mapping
 160  *
 161  *     This function does not handle bus mappings for DMA transfers. In
 162  *     almost all conceivable cases a device driver should not be using
 163  *     this function
 164  */
 165 static inline void * phys_to_virt(unsigned long address)
 166 {
 167         return (void *)(address + PAGE_OFFSET);
 168 }
 169
 170 /*
 171  * ISA I/O bus memory addresses are 1:1 with the physical address.
 172  */
 173 static inline unsigned long isa_virt_to_bus(volatile void * address)
 174 {
 175         return (unsigned long)address - PAGE_OFFSET;
 176 }
 177
 178 static inline void * isa_bus_to_virt(unsigned long address)
 179 {
 180         return (void *)(address + PAGE_OFFSET);
 181 }
 182
 183 #define isa_page_to_bus page_to_phys
 184
 185 /*
 186  * However PCI ones are not necessarily 1:1 and therefore these interfaces
 187  * are forbidden in portable PCI drivers.
 188  *
 189  * Allow them for x86 for legacy drivers, though.
 190  */
 191 #define virt_to_bus virt_to_phys
 192 #define bus_to_virt phys_to_virt
 193
 194 /*
 195  * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
 196  * for the processor.  This implies the assumption that there is only
 197  * one of these busses.
 198  */
 199 extern unsigned long isa_slot_offset;
 200
 201 /*
 202  * Change "struct page" to physical address.
 203  */
 204 #define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
 205
 206 extern void __iomem * __ioremap(phys_t offset, phys_t size, unsigned long flags);
 207 extern void __iounmap(volatile void __iomem *addr);
 208
 209 static inline void __iomem * __ioremap_mode(phys_t offset, unsigned long size,
 210         unsigned long flags)
 211 {
 212 #define __IS_LOW512(addr) (!((phys_t)(addr) & (phys_t) ~0x1fffffffULL))
 213
 214         if (cpu_has_64bit_addresses) {
 215                 u64 base = UNCAC_BASE;
 216
 217                 /*
 218                  * R10000 supports a 2 bit uncached attribute therefore
 219                  * UNCAC_BASE may not equal IO_BASE.
 220                  */
 221                 if (flags == _CACHE_UNCACHED)
 222                         base = (u64) IO_BASE;
 223                 return (void __iomem *) (unsigned long) (base + offset);
 224         } else if (__builtin_constant_p(offset) &&
 225                    __builtin_constant_p(size) && __builtin_constant_p(flags)) {
 226                 phys_t phys_addr, last_addr;
 227
 228                 phys_addr = fixup_bigphys_addr(offset, size);
 229
 230                 /* Don't allow wraparound or zero size. */
 231                 last_addr = phys_addr + size - 1;
 232                 if (!size || last_addr < phys_addr)
 233                         return NULL;
 234
 235                 /*
 236                  * Map uncached objects in the low 512MB of address
 237                  * space using KSEG1.
 238                  */
 239                 if (__IS_LOW512(phys_addr) && __IS_LOW512(last_addr) &&
 240                     flags == _CACHE_UNCACHED)
 241                         return (void __iomem *)CKSEG1ADDR(phys_addr);
 242         }
 243
 244         return __ioremap(offset, size, flags);
 245
 246 #undef __IS_LOW512
 247 }
 248
 249 /*
 250  * ioremap     -   map bus memory into CPU space
 251  * @offset:    bus address of the memory
 252  * @size:      size of the resource to map
 253  *
 254  * ioremap performs a platform specific sequence of operations to
 255  * make bus memory CPU accessible via the readb/readw/readl/writeb/
 256  * writew/writel functions and the other mmio helpers. The returned
 257  * address is not guaranteed to be usable directly as a virtual
 258  * address.
 259  */
 260 #define ioremap(offset, size)                                           \
 261         __ioremap_mode((offset), (size), _CACHE_UNCACHED)
 262
 263 /*
 264  * ioremap_nocache     -   map bus memory into CPU space
 265  * @offset:    bus address of the memory
 266  * @size:      size of the resource to map
 267  *
 268  * ioremap_nocache performs a platform specific sequence of operations to
 269  * make bus memory CPU accessible via the readb/readw/readl/writeb/
 270  * writew/writel functions and the other mmio helpers. The returned
 271  * address is not guaranteed to be usable directly as a virtual
 272  * address.
 273  *
 274  * This version of ioremap ensures that the memory is marked uncachable
 275  * on the CPU as well as honouring existing caching rules from things like
 276  * the PCI bus. Note that there are other caches and buffers on many
 277  * busses. In paticular driver authors should read up on PCI writes
 278  *
 279  * It's useful if some control registers are in such an area and
 280  * write combining or read caching is not desirable:
 281  */
 282 #define ioremap_nocache(offset, size)                                   \
 283         __ioremap_mode((offset), (size), _CACHE_UNCACHED)
 284
 285 /*
 286  * ioremap_cachable -   map bus memory into CPU space
 287  * @offset:         bus address of the memory
 288  * @size:           size of the resource to map
 289  *
 290  * ioremap_nocache performs a platform specific sequence of operations to
 291  * make bus memory CPU accessible via the readb/readw/readl/writeb/
 292  * writew/writel functions and the other mmio helpers. The returned
 293  * address is not guaranteed to be usable directly as a virtual
 294  * address.
 295  *
 296  * This version of ioremap ensures that the memory is marked cachable by
 297  * the CPU.  Also enables full write-combining.  Useful for some
 298  * memory-like regions on I/O busses.
 299  */
 300 #define ioremap_cachable(offset, size)                                  \
 301         __ioremap_mode((offset), (size), PAGE_CACHABLE_DEFAULT)
 302
 303 /*
 304  * These two are MIPS specific ioremap variant.  ioremap_cacheable_cow
 305  * requests a cachable mapping, ioremap_uncached_accelerated requests a
 306  * mapping using the uncached accelerated mode which isn't supported on
 307  * all processors.
 308  */
 309 #define ioremap_cacheable_cow(offset, size)                             \
 310         __ioremap_mode((offset), (size), _CACHE_CACHABLE_COW)
 311 #define ioremap_uncached_accelerated(offset, size)                      \
 312         __ioremap_mode((offset), (size), _CACHE_UNCACHED_ACCELERATED)
 313
 314 static inline void iounmap(volatile void __iomem *addr)
 315 {
 316 #define __IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1)
 317
 318         if (cpu_has_64bit_addresses ||
 319             (__builtin_constant_p(addr) && __IS_KSEG1(addr)))
 320                 return;
 321
 322         __iounmap(addr);
 323
 324 #undef __IS_KSEG1
 325 }
 326
 327 #define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq)                     \
 328                                                                         \
 329 static inline void pfx##write##bwlq(type val,                           \
 330                                     volatile void __iomem *mem)         \
 331 {                                                                       \
 332         volatile type *__mem;                                           \
 333         type __val;                                                     \
 334                                                                         \
 335         __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem));    \
 336                                                                         \
 337         __val = pfx##ioswab##bwlq(val);                                 \
 338                                                                         \
 339         if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
 340                 *__mem = __val;                                         \
 341         else if (cpu_has_64bits) {                                      \
 342                 unsigned long __flags;                                  \
 343                 type __tmp;                                             \
 344                                                                         \
 345                 if (irq)                                                \
 346                         local_irq_save(__flags);                        \
 347                 __asm__ __volatile__(                                   \
 348                         ".set   mips3"          "\t\t# __writeq""\n\t"  \
 349                         "dsll32 %L0, %L0, 0"                    "\n\t"  \
 350                         "dsrl32 %L0, %L0, 0"                    "\n\t"  \
 351                         "dsll32 %M0, %M0, 0"                    "\n\t"  \
 352                         "or     %L0, %L0, %M0"                  "\n\t"  \
 353                         "sd     %L0, %2"                        "\n\t"  \
 354                         ".set   mips0"                          "\n"    \
 355                         : "=r" (__tmp)                                  \
 356                         : "0" (__val), "m" (*__mem));                   \
 357                 if (irq)                                                \
 358                         local_irq_restore(__flags);                     \
 359         } else                                                          \
 360                 BUG();                                                  \
 361 }                                                                       \
 362                                                                         \
 363 static inline type pfx##read##bwlq(const volatile void __iomem *mem)    \
 364 {                                                                       \
 365         volatile type *__mem;                                           \
 366         type __val;                                                     \
 367                                                                         \
 368         __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem));    \
 369                                                                         \
 370         if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \
 371                 __val = *__mem;                                         \
 372         else if (cpu_has_64bits) {                                      \
 373                 unsigned long __flags;                                  \
 374                                                                         \
 375                 if (irq)                                                \
 376                         local_irq_save(__flags);                        \
 377                 __asm__ __volatile__(                                   \
 378                         ".set   mips3"          "\t\t# __readq" "\n\t"  \
 379                         "ld     %L0, %1"                        "\n\t"  \
 380                         "dsra32 %M0, %L0, 0"                    "\n\t"  \
 381                         "sll    %L0, %L0, 0"                    "\n\t"  \
 382                         ".set   mips0"                          "\n"    \
 383                         : "=r" (__val)                                  \
 384                         : "m" (*__mem));                                \
 385                 if (irq)                                                \
 386                         local_irq_restore(__flags);                     \
 387         } else {                                                        \
 388                 __val = 0;                                              \
 389                 BUG();                                                  \
 390         }                                                               \
 391                                                                         \
 392         return pfx##ioswab##bwlq(__val);                                \
 393 }
 394
 395 #define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p, slow)                 \
 396                                                                         \
 397 static inline void pfx##out##bwlq##p(type val, unsigned long port)      \
 398 {                                                                       \
 399         volatile type *__addr;                                          \
 400         type __val;                                                     \
 401                                                                         \
 402         port = __swizzle_addr_##bwlq(port);                             \
 403         __addr = (void *)(mips_io_port_base + port);                    \
 404                                                                         \
 405         __val = pfx##ioswab##bwlq(val);                                 \
 406                                                                         \
 407         /* Really, we want this to be atomic */                         \
 408         BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long));             \
 409                                                                         \
 410         *__addr = __val;                                                \
 411         slow;                                                           \
 412 }                                                                       \
 413                                                                         \
 414 static inline type pfx##in##bwlq##p(unsigned long port)                 \
 415 {                                                                       \
 416         volatile type *__addr;                                          \
 417         type __val;                                                     \
 418                                                                         \
 419         port = __swizzle_addr_##bwlq(port);                             \
 420         __addr = (void *)(mips_io_port_base + port);                    \
 421                                                                         \
 422         BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long));             \
 423                                                                         \
 424         __val = *__addr;                                                \
 425         slow;                                                           \
 426                                                                         \
 427         return pfx##ioswab##bwlq(__val);                                \
 428 }
 429
 430 #define __BUILD_MEMORY_PFX(bus, bwlq, type)                             \
 431                                                                         \
 432 __BUILD_MEMORY_SINGLE(bus, bwlq, type, 1)
 433
 434 #define BUILDIO_MEM(bwlq, type)                                         \
 435                                                                         \
 436 __BUILD_MEMORY_PFX(__raw_, bwlq, type)                                  \
 437 __BUILD_MEMORY_PFX(, bwlq, type)                                        \
 438 __BUILD_MEMORY_PFX(__mem_, bwlq, type)                                  \
 439
 440 BUILDIO_MEM(b, u8)
 441 BUILDIO_MEM(w, u16)
 442 BUILDIO_MEM(l, u32)
 443 BUILDIO_MEM(q, u64)
 444
 445 #define __BUILD_IOPORT_PFX(bus, bwlq, type)                             \
 446         __BUILD_IOPORT_SINGLE(bus, bwlq, type, ,)                       \
 447         __BUILD_IOPORT_SINGLE(bus, bwlq, type, _p, SLOW_DOWN_IO)
 448
 449 #define BUILDIO_IOPORT(bwlq, type)                                      \
 450         __BUILD_IOPORT_PFX(, bwlq, type)                                \
 451         __BUILD_IOPORT_PFX(__mem_, bwlq, type)
 452
 453 BUILDIO_IOPORT(b, u8)
 454 BUILDIO_IOPORT(w, u16)
 455 BUILDIO_IOPORT(l, u32)
 456 #ifdef CONFIG_64BIT
 457 BUILDIO_IOPORT(q, u64)
 458 #endif
 459
 460 #define __BUILDIO(bwlq, type)                                           \
 461                                                                         \
 462 __BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 0)
 463
 464 __BUILDIO(q, u64)
 465
 466 #define readb_relaxed                   readb
 467 #define readw_relaxed                   readw
 468 #define readl_relaxed                   readl
 469 #define readq_relaxed                   readq
 470
 471 /*
 472  * Some code tests for these symbols
 473  */
 474 #define readq                           readq
 475 #define writeq                          writeq
 476
 477 #define __BUILD_MEMORY_STRING(bwlq, type)                               \
 478                                                                         \
 479 static inline void writes##bwlq(volatile void __iomem *mem,             \
 480                                 const void *addr, unsigned int count)   \
 481 {                                                                       \
 482         const volatile type *__addr = addr;                             \
 483                                                                         \
 484         while (count--) {                                               \
 485                 __mem_write##bwlq(*__addr, mem);                        \
 486                 __addr++;                                               \
 487         }                                                               \
 488 }                                                                       \
 489                                                                         \
 490 static inline void reads##bwlq(volatile void __iomem *mem, void *addr,  \
 491                                unsigned int count)                      \
 492 {                                                                       \
 493         volatile type *__addr = addr;                                   \
 494                                                                         \
 495         while (count--) {                                               \
 496                 *__addr = __mem_read##bwlq(mem);                        \
 497                 __addr++;                                               \
 498         }                                                               \
 499 }
 500
 501 #define __BUILD_IOPORT_STRING(bwlq, type)                               \
 502                                                                         \
 503 static inline void outs##bwlq(unsigned long port, const void *addr,     \
 504                               unsigned int count)                       \
 505 {                                                                       \
 506         const volatile type *__addr = addr;                             \
 507                                                                         \
 508         while (count--) {                                               \
 509                 __mem_out##bwlq(*__addr, port);                         \
 510                 __addr++;                                               \
 511         }                                                               \
 512 }                                                                       \
 513                                                                         \
 514 static inline void ins##bwlq(unsigned long port, void *addr,            \
 515                              unsigned int count)                        \
 516 {                                                                       \
 517         volatile type *__addr = addr;                                   \
 518                                                                         \
 519         while (count--) {                                               \
 520                 *__addr = __mem_in##bwlq(port);                         \
 521                 __addr++;                                               \
 522         }                                                               \
 523 }
 524
 525 #define BUILDSTRING(bwlq, type)                                         \
 526                                                                         \
 527 __BUILD_MEMORY_STRING(bwlq, type)                                       \
 528 __BUILD_IOPORT_STRING(bwlq, type)
 529
 530 BUILDSTRING(b, u8)
 531 BUILDSTRING(w, u16)
 532 BUILDSTRING(l, u32)
 533 #ifdef CONFIG_64BIT
 534 BUILDSTRING(q, u64)
 535 #endif
 536
 537
 538 /* Depends on MIPS II instruction set */
 539 #define mmiowb() asm volatile ("sync" ::: "memory")
 540
 541 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
 542 {
 543         memset((void __force *) addr, val, count);
 544 }
 545 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
 546 {
 547         memcpy(dst, (void __force *) src, count);
 548 }
 549 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
 550 {
 551         memcpy((void __force *) dst, src, count);
 552 }
 553
 554 /*
 555  * Memory Mapped I/O
 556  */
 557 #define ioread8(addr)           readb(addr)
 558 #define ioread16(addr)          readw(addr)
 559 #define ioread32(addr)          readl(addr)
 560
 561 #define iowrite8(b,addr)        writeb(b,addr)
 562 #define iowrite16(w,addr)       writew(w,addr)
 563 #define iowrite32(l,addr)       writel(l,addr)
 564
 565 #define ioread8_rep(a,b,c)      readsb(a,b,c)
 566 #define ioread16_rep(a,b,c)     readsw(a,b,c)
 567 #define ioread32_rep(a,b,c)     readsl(a,b,c)
 568
 569 #define iowrite8_rep(a,b,c)     writesb(a,b,c)
 570 #define iowrite16_rep(a,b,c)    writesw(a,b,c)
 571 #define iowrite32_rep(a,b,c)    writesl(a,b,c)
 572
 573 /* Create a virtual mapping cookie for an IO port range */
 574 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
 575 extern void ioport_unmap(void __iomem *);
 576
 577 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 578 struct pci_dev;
 579 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
 580 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
 581
 582 /*
 583  * ISA space is 'always mapped' on currently supported MIPS systems, no need
 584  * to explicitly ioremap() it. The fact that the ISA IO space is mapped
 585  * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
 586  * are physical addresses. The following constant pointer can be
 587  * used as the IO-area pointer (it can be iounmapped as well, so the
 588  * analogy with PCI is quite large):
 589  */
 590 #define __ISA_IO_base ((char *)(isa_slot_offset))
 591
 592 #define isa_readb(a)            readb(__ISA_IO_base + (a))
 593 #define isa_readw(a)            readw(__ISA_IO_base + (a))
 594 #define isa_readl(a)            readl(__ISA_IO_base + (a))
 595 #define isa_readq(a)            readq(__ISA_IO_base + (a))
 596 #define isa_writeb(b,a)         writeb(b,__ISA_IO_base + (a))
 597 #define isa_writew(w,a)         writew(w,__ISA_IO_base + (a))
 598 #define isa_writel(l,a)         writel(l,__ISA_IO_base + (a))
 599 #define isa_writeq(q,a)         writeq(q,__ISA_IO_base + (a))
 600 #define isa_memset_io(a,b,c)    memset_io(__ISA_IO_base + (a),(b),(c))
 601 #define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),__ISA_IO_base + (b),(c))
 602 #define isa_memcpy_toio(a,b,c)  memcpy_toio(__ISA_IO_base + (a),(b),(c))
 603
 604 /*
 605  * We don't have csum_partial_copy_fromio() yet, so we cheat here and
 606  * just copy it. The net code will then do the checksum later.
 607  */
 608 #define eth_io_copy_and_sum(skb,src,len,unused) memcpy_fromio((skb)->data,(src),(len))
 609 #define isa_eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(b),(c),(d))
 610
 611 /*
 612  *     check_signature         -       find BIOS signatures
 613  *     @io_addr: mmio address to check
 614  *     @signature:  signature block
 615  *     @length: length of signature
 616  *
 617  *     Perform a signature comparison with the mmio address io_addr. This
 618  *     address should have been obtained by ioremap.
 619  *     Returns 1 on a match.
 620  */
 621 static inline int check_signature(char __iomem *io_addr,
 622         const unsigned char *signature, int length)
 623 {
 624         int retval = 0;
 625         do {
 626                 if (readb(io_addr) != *signature)
 627                         goto out;
 628                 io_addr++;
 629                 signature++;
 630                 length--;
 631         } while (length);
 632         retval = 1;
 633 out:
 634         return retval;
 635 }
 636
 637 /*
 638  * The caches on some architectures aren't dma-coherent and have need to
 639  * handle this in software.  There are three types of operations that
 640  * can be applied to dma buffers.
 641  *
 642  *  - dma_cache_wback_inv(start, size) makes caches and coherent by
 643  *    writing the content of the caches back to memory, if necessary.
 644  *    The function also invalidates the affected part of the caches as
 645  *    necessary before DMA transfers from outside to memory.
 646  *  - dma_cache_wback(start, size) makes caches and coherent by
 647  *    writing the content of the caches back to memory, if necessary.
 648  *    The function also invalidates the affected part of the caches as
 649  *    necessary before DMA transfers from outside to memory.
 650  *  - dma_cache_inv(start, size) invalidates the affected parts of the
 651  *    caches.  Dirty lines of the caches may be written back or simply
 652  *    be discarded.  This operation is necessary before dma operations
 653  *    to the memory.
 654  */
 655 #ifdef CONFIG_DMA_NONCOHERENT
 656
 657 extern void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
 658 extern void (*_dma_cache_wback)(unsigned long start, unsigned long size);
 659 extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
 660
 661 #define dma_cache_wback_inv(start, size)        _dma_cache_wback_inv(start,size)
 662 #define dma_cache_wback(start, size)            _dma_cache_wback(start,size)
 663 #define dma_cache_inv(start, size)              _dma_cache_inv(start,size)
 664
 665 #else /* Sane hardware */
 666
 667 #define dma_cache_wback_inv(start,size) \
 668         do { (void) (start); (void) (size); } while (0)
 669 #define dma_cache_wback(start,size)     \
 670         do { (void) (start); (void) (size); } while (0)
 671 #define dma_cache_inv(start,size)       \
 672         do { (void) (start); (void) (size); } while (0)
 673
 674 #endif /* CONFIG_DMA_NONCOHERENT */
 675
 676 /*
 677  * Read a 32-bit register that requires a 64-bit read cycle on the bus.
 678  * Avoid interrupt mucking, just adjust the address for 4-byte access.
 679  * Assume the addresses are 8-byte aligned.
 680  */
 681 #ifdef __MIPSEB__
 682 #define __CSR_32_ADJUST 4
 683 #else
 684 #define __CSR_32_ADJUST 0
 685 #endif
 686
 687 #define csr_out32(v,a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST) = (v))
 688 #define csr_in32(a)    (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST))
 689
 690 /*
 691  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 692  * access
 693  */
 694 #define xlate_dev_mem_ptr(p)    __va(p)
 695
 696 /*
 697  * Convert a virtual cached pointer to an uncached pointer
 698  */
 699 #define xlate_dev_kmem_ptr(p)   p
 700
 701 #endif /* _ASM_IO_H */