include/asm-alpha/io.h

   1 #ifndef __ALPHA_IO_H
   2 #define __ALPHA_IO_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/kernel.h>
   7 #include <asm/compiler.h>
   8 #include <asm/system.h>
   9 #include <asm/pgtable.h>
  10 #include <asm/machvec.h>
  11 #include <asm/hwrpb.h>
  12
  13 /* The generic header contains only prototypes.  Including it ensures that
  14    the implementation we have here matches that interface.  */
  15 #include <asm-generic/iomap.h>
  16
  17 /* We don't use IO slowdowns on the Alpha, but.. */
  18 #define __SLOW_DOWN_IO  do { } while (0)
  19 #define SLOW_DOWN_IO    do { } while (0)
  20
  21 /*
  22  * Virtual -> physical identity mapping starts at this offset
  23  */
  24 #ifdef USE_48_BIT_KSEG
  25 #define IDENT_ADDR     0xffff800000000000UL
  26 #else
  27 #define IDENT_ADDR     0xfffffc0000000000UL
  28 #endif
  29
  30 /*
  31  * We try to avoid hae updates (thus the cache), but when we
  32  * do need to update the hae, we need to do it atomically, so
  33  * that any interrupts wouldn't get confused with the hae
  34  * register not being up-to-date with respect to the hardware
  35  * value.
  36  */
  37 static inline void __set_hae(unsigned long new_hae)
  38 {
  39         unsigned long flags;
  40         local_irq_save(flags);
  41
  42         alpha_mv.hae_cache = new_hae;
  43         *alpha_mv.hae_register = new_hae;
  44         mb();
  45         /* Re-read to make sure it was written.  */
  46         new_hae = *alpha_mv.hae_register;
  47
  48         local_irq_restore(flags);
  49 }
  50
  51 static inline void set_hae(unsigned long new_hae)
  52 {
  53         if (new_hae != alpha_mv.hae_cache)
  54                 __set_hae(new_hae);
  55 }
  56
  57 /*
  58  * Change virtual addresses to physical addresses and vv.
  59  */
  60 #ifdef USE_48_BIT_KSEG
  61 static inline unsigned long virt_to_phys(void *address)
  62 {
  63         return (unsigned long)address - IDENT_ADDR;
  64 }
  65
  66 static inline void * phys_to_virt(unsigned long address)
  67 {
  68         return (void *) (address + IDENT_ADDR);
  69 }
  70 #else
  71 static inline unsigned long virt_to_phys(void *address)
  72 {
  73         unsigned long phys = (unsigned long)address;
  74
  75         /* Sign-extend from bit 41.  */
  76         phys <<= (64 - 41);
  77         phys = (long)phys >> (64 - 41);
  78
  79         /* Crop to the physical address width of the processor.  */
  80         phys &= (1ul << hwrpb->pa_bits) - 1;
  81
  82         return phys;
  83 }
  84
  85 static inline void * phys_to_virt(unsigned long address)
  86 {
  87         return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1)));
  88 }
  89 #endif
  90
  91 #define page_to_phys(page)      page_to_pa(page)
  92
  93 /* This depends on working iommu.  */
  94 #define BIO_VMERGE_BOUNDARY     (alpha_mv.mv_pci_tbi ? PAGE_SIZE : 0)
  95
  96 /* Maximum PIO space address supported?  */
  97 #define IO_SPACE_LIMIT 0xffff
  98
  99 /*
 100  * Change addresses as seen by the kernel (virtual) to addresses as
 101  * seen by a device (bus), and vice versa.
 102  *
 103  * Note that this only works for a limited range of kernel addresses,
 104  * and very well may not span all memory.  Consider this interface
 105  * deprecated in favour of the mapping functions in <asm/pci.h>.
 106  */
 107 extern unsigned long __direct_map_base;
 108 extern unsigned long __direct_map_size;
 109
 110 static inline unsigned long virt_to_bus(void *address)
 111 {
 112         unsigned long phys = virt_to_phys(address);
 113         unsigned long bus = phys + __direct_map_base;
 114         return phys <= __direct_map_size ? bus : 0;
 115 }
 116
 117 static inline void *bus_to_virt(unsigned long address)
 118 {
 119         void *virt;
 120
 121         /* This check is a sanity check but also ensures that bus address 0
 122            maps to virtual address 0 which is useful to detect null pointers
 123            (the NCR driver is much simpler if NULL pointers are preserved).  */
 124         address -= __direct_map_base;
 125         virt = phys_to_virt(address);
 126         return (long)address <= 0 ? NULL : virt;
 127 }
 128
 129 /*
 130  * There are different chipsets to interface the Alpha CPUs to the world.
 131  */
 132
 133 #define IO_CONCAT(a,b)  _IO_CONCAT(a,b)
 134 #define _IO_CONCAT(a,b) a ## _ ## b
 135
 136 #ifdef CONFIG_ALPHA_GENERIC
 137
 138 /* In a generic kernel, we always go through the machine vector.  */
 139
 140 #define REMAP1(TYPE, NAME, QUAL)                                        \
 141 static inline TYPE generic_##NAME(QUAL void __iomem *addr)              \
 142 {                                                                       \
 143         return alpha_mv.mv_##NAME(addr);                                \
 144 }
 145
 146 #define REMAP2(TYPE, NAME, QUAL)                                        \
 147 static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr)      \
 148 {                                                                       \
 149         alpha_mv.mv_##NAME(b, addr);                                    \
 150 }
 151
 152 REMAP1(unsigned int, ioread8, /**/)
 153 REMAP1(unsigned int, ioread16, /**/)
 154 REMAP1(unsigned int, ioread32, /**/)
 155 REMAP1(u8, readb, const volatile)
 156 REMAP1(u16, readw, const volatile)
 157 REMAP1(u32, readl, const volatile)
 158 REMAP1(u64, readq, const volatile)
 159
 160 REMAP2(u8, iowrite8, /**/)
 161 REMAP2(u16, iowrite16, /**/)
 162 REMAP2(u32, iowrite32, /**/)
 163 REMAP2(u8, writeb, volatile)
 164 REMAP2(u16, writew, volatile)
 165 REMAP2(u32, writel, volatile)
 166 REMAP2(u64, writeq, volatile)
 167
 168 #undef REMAP1
 169 #undef REMAP2
 170
 171 static inline void __iomem *generic_ioportmap(unsigned long a)
 172 {
 173         return alpha_mv.mv_ioportmap(a);
 174 }
 175
 176 static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s)
 177 {
 178         return alpha_mv.mv_ioremap(a, s);
 179 }
 180
 181 static inline void generic_iounmap(volatile void __iomem *a)
 182 {
 183         return alpha_mv.mv_iounmap(a);
 184 }
 185
 186 static inline int generic_is_ioaddr(unsigned long a)
 187 {
 188         return alpha_mv.mv_is_ioaddr(a);
 189 }
 190
 191 static inline int generic_is_mmio(const volatile void __iomem *a)
 192 {
 193         return alpha_mv.mv_is_mmio(a);
 194 }
 195
 196 #define __IO_PREFIX             generic
 197 #define generic_trivial_rw_bw   0
 198 #define generic_trivial_rw_lq   0
 199 #define generic_trivial_io_bw   0
 200 #define generic_trivial_io_lq   0
 201 #define generic_trivial_iounmap 0
 202
 203 #else
 204
 205 #if defined(CONFIG_ALPHA_APECS)
 206 # include <asm/core_apecs.h>
 207 #elif defined(CONFIG_ALPHA_CIA)
 208 # include <asm/core_cia.h>
 209 #elif defined(CONFIG_ALPHA_IRONGATE)
 210 # include <asm/core_irongate.h>
 211 #elif defined(CONFIG_ALPHA_JENSEN)
 212 # include <asm/jensen.h>
 213 #elif defined(CONFIG_ALPHA_LCA)
 214 # include <asm/core_lca.h>
 215 #elif defined(CONFIG_ALPHA_MARVEL)
 216 # include <asm/core_marvel.h>
 217 #elif defined(CONFIG_ALPHA_MCPCIA)
 218 # include <asm/core_mcpcia.h>
 219 #elif defined(CONFIG_ALPHA_POLARIS)
 220 # include <asm/core_polaris.h>
 221 #elif defined(CONFIG_ALPHA_T2)
 222 # include <asm/core_t2.h>
 223 #elif defined(CONFIG_ALPHA_TSUNAMI)
 224 # include <asm/core_tsunami.h>
 225 #elif defined(CONFIG_ALPHA_TITAN)
 226 # include <asm/core_titan.h>
 227 #elif defined(CONFIG_ALPHA_WILDFIRE)
 228 # include <asm/core_wildfire.h>
 229 #else
 230 #error "What system is this?"
 231 #endif
 232
 233 #endif /* GENERIC */
 234
 235 /*
 236  * We always have external versions of these routines.
 237  */
 238 extern u8               inb(unsigned long port);
 239 extern u16              inw(unsigned long port);
 240 extern u32              inl(unsigned long port);
 241 extern void             outb(u8 b, unsigned long port);
 242 extern void             outw(u16 b, unsigned long port);
 243 extern void             outl(u32 b, unsigned long port);
 244
 245 extern u8               readb(const volatile void __iomem *addr);
 246 extern u16              readw(const volatile void __iomem *addr);
 247 extern u32              readl(const volatile void __iomem *addr);
 248 extern u64              readq(const volatile void __iomem *addr);
 249 extern void             writeb(u8 b, volatile void __iomem *addr);
 250 extern void             writew(u16 b, volatile void __iomem *addr);
 251 extern void             writel(u32 b, volatile void __iomem *addr);
 252 extern void             writeq(u64 b, volatile void __iomem *addr);
 253
 254 extern u8               __raw_readb(const volatile void __iomem *addr);
 255 extern u16              __raw_readw(const volatile void __iomem *addr);
 256 extern u32              __raw_readl(const volatile void __iomem *addr);
 257 extern u64              __raw_readq(const volatile void __iomem *addr);
 258 extern void             __raw_writeb(u8 b, volatile void __iomem *addr);
 259 extern void             __raw_writew(u16 b, volatile void __iomem *addr);
 260 extern void             __raw_writel(u32 b, volatile void __iomem *addr);
 261 extern void             __raw_writeq(u64 b, volatile void __iomem *addr);
 262
 263 /*
 264  * Mapping from port numbers to __iomem space is pretty easy.
 265  */
 266
 267 /* These two have to be extern inline because of the extern prototype from
 268    <asm-generic/iomap.h>.  It is not legal to mix "extern" and "static" for
 269    the same declaration.  */
 270 extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
 271 {
 272         return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
 273 }
 274
 275 extern inline void ioport_unmap(void __iomem *addr)
 276 {
 277 }
 278
 279 static inline void __iomem *ioremap(unsigned long port, unsigned long size)
 280 {
 281         return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
 282 }
 283
 284 static inline void __iomem *__ioremap(unsigned long port, unsigned long size,
 285                                       unsigned long flags)
 286 {
 287         return ioremap(port, size);
 288 }
 289
 290 static inline void __iomem * ioremap_nocache(unsigned long offset,
 291                                              unsigned long size)
 292 {
 293         return ioremap(offset, size);
 294 }
 295
 296 static inline void iounmap(volatile void __iomem *addr)
 297 {
 298         IO_CONCAT(__IO_PREFIX,iounmap)(addr);
 299 }
 300
 301 static inline int __is_ioaddr(unsigned long addr)
 302 {
 303         return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
 304 }
 305 #define __is_ioaddr(a)          __is_ioaddr((unsigned long)(a))
 306
 307 static inline int __is_mmio(const volatile void __iomem *addr)
 308 {
 309         return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
 310 }
 311
 312
 313 /*
 314  * If the actual I/O bits are sufficiently trivial, then expand inline.
 315  */
 316
 317 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
 318 extern inline unsigned int ioread8(void __iomem *addr)
 319 {
 320         unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
 321         mb();
 322         return ret;
 323 }
 324
 325 extern inline unsigned int ioread16(void __iomem *addr)
 326 {
 327         unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
 328         mb();
 329         return ret;
 330 }
 331
 332 extern inline void iowrite8(u8 b, void __iomem *addr)
 333 {
 334         IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
 335         mb();
 336 }
 337
 338 extern inline void iowrite16(u16 b, void __iomem *addr)
 339 {
 340         IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
 341         mb();
 342 }
 343
 344 extern inline u8 inb(unsigned long port)
 345 {
 346         return ioread8(ioport_map(port, 1));
 347 }
 348
 349 extern inline u16 inw(unsigned long port)
 350 {
 351         return ioread16(ioport_map(port, 2));
 352 }
 353
 354 extern inline void outb(u8 b, unsigned long port)
 355 {
 356         iowrite8(b, ioport_map(port, 1));
 357 }
 358
 359 extern inline void outw(u16 b, unsigned long port)
 360 {
 361         iowrite16(b, ioport_map(port, 2));
 362 }
 363 #endif
 364
 365 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
 366 extern inline unsigned int ioread32(void __iomem *addr)
 367 {
 368         unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
 369         mb();
 370         return ret;
 371 }
 372
 373 extern inline void iowrite32(u32 b, void __iomem *addr)
 374 {
 375         IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
 376         mb();
 377 }
 378
 379 extern inline u32 inl(unsigned long port)
 380 {
 381         return ioread32(ioport_map(port, 4));
 382 }
 383
 384 extern inline void outl(u32 b, unsigned long port)
 385 {
 386         iowrite32(b, ioport_map(port, 4));
 387 }
 388 #endif
 389
 390 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
 391 extern inline u8 __raw_readb(const volatile void __iomem *addr)
 392 {
 393         return IO_CONCAT(__IO_PREFIX,readb)(addr);
 394 }
 395
 396 extern inline u16 __raw_readw(const volatile void __iomem *addr)
 397 {
 398         return IO_CONCAT(__IO_PREFIX,readw)(addr);
 399 }
 400
 401 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
 402 {
 403         IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
 404 }
 405
 406 extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
 407 {
 408         IO_CONCAT(__IO_PREFIX,writew)(b, addr);
 409 }
 410
 411 extern inline u8 readb(const volatile void __iomem *addr)
 412 {
 413         u8 ret = __raw_readb(addr);
 414         mb();
 415         return ret;
 416 }
 417
 418 extern inline u16 readw(const volatile void __iomem *addr)
 419 {
 420         u16 ret = __raw_readw(addr);
 421         mb();
 422         return ret;
 423 }
 424
 425 extern inline void writeb(u8 b, volatile void __iomem *addr)
 426 {
 427         __raw_writeb(b, addr);
 428         mb();
 429 }
 430
 431 extern inline void writew(u16 b, volatile void __iomem *addr)
 432 {
 433         __raw_writew(b, addr);
 434         mb();
 435 }
 436 #endif
 437
 438 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
 439 extern inline u32 __raw_readl(const volatile void __iomem *addr)
 440 {
 441         return IO_CONCAT(__IO_PREFIX,readl)(addr);
 442 }
 443
 444 extern inline u64 __raw_readq(const volatile void __iomem *addr)
 445 {
 446         return IO_CONCAT(__IO_PREFIX,readq)(addr);
 447 }
 448
 449 extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
 450 {
 451         IO_CONCAT(__IO_PREFIX,writel)(b, addr);
 452 }
 453
 454 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
 455 {
 456         IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
 457 }
 458
 459 extern inline u32 readl(const volatile void __iomem *addr)
 460 {
 461         u32 ret = __raw_readl(addr);
 462         mb();
 463         return ret;
 464 }
 465
 466 extern inline u64 readq(const volatile void __iomem *addr)
 467 {
 468         u64 ret = __raw_readq(addr);
 469         mb();
 470         return ret;
 471 }
 472
 473 extern inline void writel(u32 b, volatile void __iomem *addr)
 474 {
 475         __raw_writel(b, addr);
 476         mb();
 477 }
 478
 479 extern inline void writeq(u64 b, volatile void __iomem *addr)
 480 {
 481         __raw_writeq(b, addr);
 482         mb();
 483 }
 484 #endif
 485
 486 #define inb_p           inb
 487 #define inw_p           inw
 488 #define inl_p           inl
 489 #define outb_p          outb
 490 #define outw_p          outw
 491 #define outl_p          outl
 492 #define readb_relaxed(addr) __raw_readb(addr)
 493 #define readw_relaxed(addr) __raw_readw(addr)
 494 #define readl_relaxed(addr) __raw_readl(addr)
 495 #define readq_relaxed(addr) __raw_readq(addr)
 496
 497 #define mmiowb()
 498
 499 /*
 500  * String version of IO memory access ops:
 501  */
 502 extern void memcpy_fromio(void *, const volatile void __iomem *, long);
 503 extern void memcpy_toio(volatile void __iomem *, const void *, long);
 504 extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
 505
 506 static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
 507 {
 508         _memset_c_io(addr, 0x0101010101010101UL * c, len);
 509 }
 510
 511 #define __HAVE_ARCH_MEMSETW_IO
 512 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
 513 {
 514         _memset_c_io(addr, 0x0001000100010001UL * c, len);
 515 }
 516
 517 /*
 518  * String versions of in/out ops:
 519  */
 520 extern void insb (unsigned long port, void *dst, unsigned long count);
 521 extern void insw (unsigned long port, void *dst, unsigned long count);
 522 extern void insl (unsigned long port, void *dst, unsigned long count);
 523 extern void outsb (unsigned long port, const void *src, unsigned long count);
 524 extern void outsw (unsigned long port, const void *src, unsigned long count);
 525 extern void outsl (unsigned long port, const void *src, unsigned long count);
 526
 527 /*
 528  * The Alpha Jensen hardware for some rather strange reason puts
 529  * the RTC clock at 0x170 instead of 0x70. Probably due to some
 530  * misguided idea about using 0x70 for NMI stuff.
 531  *
 532  * These defines will override the defaults when doing RTC queries
 533  */
 534
 535 #ifdef CONFIG_ALPHA_GENERIC
 536 # define RTC_PORT(x)    ((x) + alpha_mv.rtc_port)
 537 #else
 538 # ifdef CONFIG_ALPHA_JENSEN
 539 #  define RTC_PORT(x)   (0x170+(x))
 540 # else
 541 #  define RTC_PORT(x)   (0x70 + (x))
 542 # endif
 543 #endif
 544 #define RTC_ALWAYS_BCD  0
 545
 546 /* Nothing to do */
 547
 548 #define dma_cache_inv(_start,_size)             do { } while (0)
 549 #define dma_cache_wback(_start,_size)           do { } while (0)
 550 #define dma_cache_wback_inv(_start,_size)       do { } while (0)
 551
 552 /*
 553  * Some mucking forons use if[n]def writeq to check if platform has it.
 554  * It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
 555  * to play with; for now just use cpp anti-recursion logics and make sure
 556  * that damn thing is defined and expands to itself.
 557  */
 558
 559 #define writeq writeq
 560 #define readq readq
 561
 562 /*
 563  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 564  * access
 565  */
 566 #define xlate_dev_mem_ptr(p)    __va(p)
 567
 568 /*
 569  * Convert a virtual cached pointer to an uncached pointer
 570  */
 571 #define xlate_dev_kmem_ptr(p)   p
 572
 573 #endif /* __KERNEL__ */
 574
 575 #endif /* __ALPHA_IO_H */