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 <linux/mm.h>
   8 #include <asm/compiler.h>
   9 #include <asm/system.h>
  10 #include <asm/pgtable.h>
  11 #include <asm/machvec.h>
  12 #include <asm/hwrpb.h>
  13
  14 /* The generic header contains only prototypes.  Including it ensures that
  15    the implementation we have here matches that interface.  */
  16 #include <asm-generic/iomap.h>
  17
  18 /* We don't use IO slowdowns on the Alpha, but.. */
  19 #define __SLOW_DOWN_IO  do { } while (0)
  20 #define SLOW_DOWN_IO    do { } while (0)
  21
  22 /*
  23  * Virtual -> physical identity mapping starts at this offset
  24  */
  25 #ifdef USE_48_BIT_KSEG
  26 #define IDENT_ADDR     0xffff800000000000UL
  27 #else
  28 #define IDENT_ADDR     0xfffffc0000000000UL
  29 #endif
  30
  31 /*
  32  * We try to avoid hae updates (thus the cache), but when we
  33  * do need to update the hae, we need to do it atomically, so
  34  * that any interrupts wouldn't get confused with the hae
  35  * register not being up-to-date with respect to the hardware
  36  * value.
  37  */
  38 static inline void __set_hae(unsigned long new_hae)
  39 {
  40         unsigned long flags;
  41         local_irq_save(flags);
  42
  43         alpha_mv.hae_cache = new_hae;
  44         *alpha_mv.hae_register = new_hae;
  45         mb();
  46         /* Re-read to make sure it was written.  */
  47         new_hae = *alpha_mv.hae_register;
  48
  49         local_irq_restore(flags);
  50 }
  51
  52 static inline void set_hae(unsigned long new_hae)
  53 {
  54         if (new_hae != alpha_mv.hae_cache)
  55                 __set_hae(new_hae);
  56 }
  57
  58 /*
  59  * Change virtual addresses to physical addresses and vv.
  60  */
  61 #ifdef USE_48_BIT_KSEG
  62 static inline unsigned long virt_to_phys(void *address)
  63 {
  64         return (unsigned long)address - IDENT_ADDR;
  65 }
  66
  67 static inline void * phys_to_virt(unsigned long address)
  68 {
  69         return (void *) (address + IDENT_ADDR);
  70 }
  71 #else
  72 static inline unsigned long virt_to_phys(void *address)
  73 {
  74         unsigned long phys = (unsigned long)address;
  75
  76         /* Sign-extend from bit 41.  */
  77         phys <<= (64 - 41);
  78         phys = (long)phys >> (64 - 41);
  79
  80         /* Crop to the physical address width of the processor.  */
  81         phys &= (1ul << hwrpb->pa_bits) - 1;
  82
  83         return phys;
  84 }
  85
  86 static inline void * phys_to_virt(unsigned long address)
  87 {
  88         return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1)));
  89 }
  90 #endif
  91
  92 #define page_to_phys(page)      page_to_pa(page)
  93
  94 static inline dma_addr_t __deprecated isa_page_to_bus(struct page *page)
  95 {
  96         return page_to_phys(page);
  97 }
  98
  99 /* This depends on working iommu.  */
 100 #define BIO_VMERGE_BOUNDARY     (alpha_mv.mv_pci_tbi ? PAGE_SIZE : 0)
 101
 102 /* Maximum PIO space address supported?  */
 103 #define IO_SPACE_LIMIT 0xffff
 104
 105 /*
 106  * Change addresses as seen by the kernel (virtual) to addresses as
 107  * seen by a device (bus), and vice versa.
 108  *
 109  * Note that this only works for a limited range of kernel addresses,
 110  * and very well may not span all memory.  Consider this interface
 111  * deprecated in favour of the DMA-mapping API.
 112  */
 113 extern unsigned long __direct_map_base;
 114 extern unsigned long __direct_map_size;
 115
 116 static inline unsigned long __deprecated virt_to_bus(void *address)
 117 {
 118         unsigned long phys = virt_to_phys(address);
 119         unsigned long bus = phys + __direct_map_base;
 120         return phys <= __direct_map_size ? bus : 0;
 121 }
 122 #define isa_virt_to_bus virt_to_bus
 123
 124 static inline void * __deprecated bus_to_virt(unsigned long address)
 125 {
 126         void *virt;
 127
 128         /* This check is a sanity check but also ensures that bus address 0
 129            maps to virtual address 0 which is useful to detect null pointers
 130            (the NCR driver is much simpler if NULL pointers are preserved).  */
 131         address -= __direct_map_base;
 132         virt = phys_to_virt(address);
 133         return (long)address <= 0 ? NULL : virt;
 134 }
 135 #define isa_bus_to_virt bus_to_virt
 136
 137 /*
 138  * There are different chipsets to interface the Alpha CPUs to the world.
 139  */
 140
 141 #define IO_CONCAT(a,b)  _IO_CONCAT(a,b)
 142 #define _IO_CONCAT(a,b) a ## _ ## b
 143
 144 #ifdef CONFIG_ALPHA_GENERIC
 145
 146 /* In a generic kernel, we always go through the machine vector.  */
 147
 148 #define REMAP1(TYPE, NAME, QUAL)                                        \
 149 static inline TYPE generic_##NAME(QUAL void __iomem *addr)              \
 150 {                                                                       \
 151         return alpha_mv.mv_##NAME(addr);                                \
 152 }
 153
 154 #define REMAP2(TYPE, NAME, QUAL)                                        \
 155 static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr)      \
 156 {                                                                       \
 157         alpha_mv.mv_##NAME(b, addr);                                    \
 158 }
 159
 160 REMAP1(unsigned int, ioread8, /**/)
 161 REMAP1(unsigned int, ioread16, /**/)
 162 REMAP1(unsigned int, ioread32, /**/)
 163 REMAP1(u8, readb, const volatile)
 164 REMAP1(u16, readw, const volatile)
 165 REMAP1(u32, readl, const volatile)
 166 REMAP1(u64, readq, const volatile)
 167
 168 REMAP2(u8, iowrite8, /**/)
 169 REMAP2(u16, iowrite16, /**/)
 170 REMAP2(u32, iowrite32, /**/)
 171 REMAP2(u8, writeb, volatile)
 172 REMAP2(u16, writew, volatile)
 173 REMAP2(u32, writel, volatile)
 174 REMAP2(u64, writeq, volatile)
 175
 176 #undef REMAP1
 177 #undef REMAP2
 178
 179 static inline void __iomem *generic_ioportmap(unsigned long a)
 180 {
 181         return alpha_mv.mv_ioportmap(a);
 182 }
 183
 184 static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s)
 185 {
 186         return alpha_mv.mv_ioremap(a, s);
 187 }
 188
 189 static inline void generic_iounmap(volatile void __iomem *a)
 190 {
 191         return alpha_mv.mv_iounmap(a);
 192 }
 193
 194 static inline int generic_is_ioaddr(unsigned long a)
 195 {
 196         return alpha_mv.mv_is_ioaddr(a);
 197 }
 198
 199 static inline int generic_is_mmio(const volatile void __iomem *a)
 200 {
 201         return alpha_mv.mv_is_mmio(a);
 202 }
 203
 204 #define __IO_PREFIX             generic
 205 #define generic_trivial_rw_bw   0
 206 #define generic_trivial_rw_lq   0
 207 #define generic_trivial_io_bw   0
 208 #define generic_trivial_io_lq   0
 209 #define generic_trivial_iounmap 0
 210
 211 #else
 212
 213 #if defined(CONFIG_ALPHA_APECS)
 214 # include <asm/core_apecs.h>
 215 #elif defined(CONFIG_ALPHA_CIA)
 216 # include <asm/core_cia.h>
 217 #elif defined(CONFIG_ALPHA_IRONGATE)
 218 # include <asm/core_irongate.h>
 219 #elif defined(CONFIG_ALPHA_JENSEN)
 220 # include <asm/jensen.h>
 221 #elif defined(CONFIG_ALPHA_LCA)
 222 # include <asm/core_lca.h>
 223 #elif defined(CONFIG_ALPHA_MARVEL)
 224 # include <asm/core_marvel.h>
 225 #elif defined(CONFIG_ALPHA_MCPCIA)
 226 # include <asm/core_mcpcia.h>
 227 #elif defined(CONFIG_ALPHA_POLARIS)
 228 # include <asm/core_polaris.h>
 229 #elif defined(CONFIG_ALPHA_T2)
 230 # include <asm/core_t2.h>
 231 #elif defined(CONFIG_ALPHA_TSUNAMI)
 232 # include <asm/core_tsunami.h>
 233 #elif defined(CONFIG_ALPHA_TITAN)
 234 # include <asm/core_titan.h>
 235 #elif defined(CONFIG_ALPHA_WILDFIRE)
 236 # include <asm/core_wildfire.h>
 237 #else
 238 #error "What system is this?"
 239 #endif
 240
 241 #endif /* GENERIC */
 242
 243 /*
 244  * We always have external versions of these routines.
 245  */
 246 extern u8               inb(unsigned long port);
 247 extern u16              inw(unsigned long port);
 248 extern u32              inl(unsigned long port);
 249 extern void             outb(u8 b, unsigned long port);
 250 extern void             outw(u16 b, unsigned long port);
 251 extern void             outl(u32 b, unsigned long port);
 252
 253 extern u8               readb(const volatile void __iomem *addr);
 254 extern u16              readw(const volatile void __iomem *addr);
 255 extern u32              readl(const volatile void __iomem *addr);
 256 extern u64              readq(const volatile void __iomem *addr);
 257 extern void             writeb(u8 b, volatile void __iomem *addr);
 258 extern void             writew(u16 b, volatile void __iomem *addr);
 259 extern void             writel(u32 b, volatile void __iomem *addr);
 260 extern void             writeq(u64 b, volatile void __iomem *addr);
 261
 262 extern u8               __raw_readb(const volatile void __iomem *addr);
 263 extern u16              __raw_readw(const volatile void __iomem *addr);
 264 extern u32              __raw_readl(const volatile void __iomem *addr);
 265 extern u64              __raw_readq(const volatile void __iomem *addr);
 266 extern void             __raw_writeb(u8 b, volatile void __iomem *addr);
 267 extern void             __raw_writew(u16 b, volatile void __iomem *addr);
 268 extern void             __raw_writel(u32 b, volatile void __iomem *addr);
 269 extern void             __raw_writeq(u64 b, volatile void __iomem *addr);
 270
 271 /*
 272  * Mapping from port numbers to __iomem space is pretty easy.
 273  */
 274
 275 /* These two have to be extern inline because of the extern prototype from
 276    <asm-generic/iomap.h>.  It is not legal to mix "extern" and "static" for
 277    the same declaration.  */
 278 extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
 279 {
 280         return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
 281 }
 282
 283 extern inline void ioport_unmap(void __iomem *addr)
 284 {
 285 }
 286
 287 static inline void __iomem *ioremap(unsigned long port, unsigned long size)
 288 {
 289         return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
 290 }
 291
 292 static inline void __iomem *__ioremap(unsigned long port, unsigned long size,
 293                                       unsigned long flags)
 294 {
 295         return ioremap(port, size);
 296 }
 297
 298 static inline void __iomem * ioremap_nocache(unsigned long offset,
 299                                              unsigned long size)
 300 {
 301         return ioremap(offset, size);
 302 }
 303
 304 static inline void iounmap(volatile void __iomem *addr)
 305 {
 306         IO_CONCAT(__IO_PREFIX,iounmap)(addr);
 307 }
 308
 309 static inline int __is_ioaddr(unsigned long addr)
 310 {
 311         return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
 312 }
 313 #define __is_ioaddr(a)          __is_ioaddr((unsigned long)(a))
 314
 315 static inline int __is_mmio(const volatile void __iomem *addr)
 316 {
 317         return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
 318 }
 319
 320
 321 /*
 322  * If the actual I/O bits are sufficiently trivial, then expand inline.
 323  */
 324
 325 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
 326 extern inline unsigned int ioread8(void __iomem *addr)
 327 {
 328         unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
 329         mb();
 330         return ret;
 331 }
 332
 333 extern inline unsigned int ioread16(void __iomem *addr)
 334 {
 335         unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
 336         mb();
 337         return ret;
 338 }
 339
 340 extern inline void iowrite8(u8 b, void __iomem *addr)
 341 {
 342         IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
 343         mb();
 344 }
 345
 346 extern inline void iowrite16(u16 b, void __iomem *addr)
 347 {
 348         IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
 349         mb();
 350 }
 351
 352 extern inline u8 inb(unsigned long port)
 353 {
 354         return ioread8(ioport_map(port, 1));
 355 }
 356
 357 extern inline u16 inw(unsigned long port)
 358 {
 359         return ioread16(ioport_map(port, 2));
 360 }
 361
 362 extern inline void outb(u8 b, unsigned long port)
 363 {
 364         iowrite8(b, ioport_map(port, 1));
 365 }
 366
 367 extern inline void outw(u16 b, unsigned long port)
 368 {
 369         iowrite16(b, ioport_map(port, 2));
 370 }
 371 #endif
 372
 373 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
 374 extern inline unsigned int ioread32(void __iomem *addr)
 375 {
 376         unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
 377         mb();
 378         return ret;
 379 }
 380
 381 extern inline void iowrite32(u32 b, void __iomem *addr)
 382 {
 383         IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
 384         mb();
 385 }
 386
 387 extern inline u32 inl(unsigned long port)
 388 {
 389         return ioread32(ioport_map(port, 4));
 390 }
 391
 392 extern inline void outl(u32 b, unsigned long port)
 393 {
 394         iowrite32(b, ioport_map(port, 4));
 395 }
 396 #endif
 397
 398 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
 399 extern inline u8 __raw_readb(const volatile void __iomem *addr)
 400 {
 401         return IO_CONCAT(__IO_PREFIX,readb)(addr);
 402 }
 403
 404 extern inline u16 __raw_readw(const volatile void __iomem *addr)
 405 {
 406         return IO_CONCAT(__IO_PREFIX,readw)(addr);
 407 }
 408
 409 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
 410 {
 411         IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
 412 }
 413
 414 extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
 415 {
 416         IO_CONCAT(__IO_PREFIX,writew)(b, addr);
 417 }
 418
 419 extern inline u8 readb(const volatile void __iomem *addr)
 420 {
 421         u8 ret = __raw_readb(addr);
 422         mb();
 423         return ret;
 424 }
 425
 426 extern inline u16 readw(const volatile void __iomem *addr)
 427 {
 428         u16 ret = __raw_readw(addr);
 429         mb();
 430         return ret;
 431 }
 432
 433 extern inline void writeb(u8 b, volatile void __iomem *addr)
 434 {
 435         __raw_writeb(b, addr);
 436         mb();
 437 }
 438
 439 extern inline void writew(u16 b, volatile void __iomem *addr)
 440 {
 441         __raw_writew(b, addr);
 442         mb();
 443 }
 444 #endif
 445
 446 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
 447 extern inline u32 __raw_readl(const volatile void __iomem *addr)
 448 {
 449         return IO_CONCAT(__IO_PREFIX,readl)(addr);
 450 }
 451
 452 extern inline u64 __raw_readq(const volatile void __iomem *addr)
 453 {
 454         return IO_CONCAT(__IO_PREFIX,readq)(addr);
 455 }
 456
 457 extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
 458 {
 459         IO_CONCAT(__IO_PREFIX,writel)(b, addr);
 460 }
 461
 462 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
 463 {
 464         IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
 465 }
 466
 467 extern inline u32 readl(const volatile void __iomem *addr)
 468 {
 469         u32 ret = __raw_readl(addr);
 470         mb();
 471         return ret;
 472 }
 473
 474 extern inline u64 readq(const volatile void __iomem *addr)
 475 {
 476         u64 ret = __raw_readq(addr);
 477         mb();
 478         return ret;
 479 }
 480
 481 extern inline void writel(u32 b, volatile void __iomem *addr)
 482 {
 483         __raw_writel(b, addr);
 484         mb();
 485 }
 486
 487 extern inline void writeq(u64 b, volatile void __iomem *addr)
 488 {
 489         __raw_writeq(b, addr);
 490         mb();
 491 }
 492 #endif
 493
 494 #define inb_p           inb
 495 #define inw_p           inw
 496 #define inl_p           inl
 497 #define outb_p          outb
 498 #define outw_p          outw
 499 #define outl_p          outl
 500 #define readb_relaxed(addr) __raw_readb(addr)
 501 #define readw_relaxed(addr) __raw_readw(addr)
 502 #define readl_relaxed(addr) __raw_readl(addr)
 503 #define readq_relaxed(addr) __raw_readq(addr)
 504
 505 #define mmiowb()
 506
 507 /*
 508  * String version of IO memory access ops:
 509  */
 510 extern void memcpy_fromio(void *, const volatile void __iomem *, long);
 511 extern void memcpy_toio(volatile void __iomem *, const void *, long);
 512 extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
 513
 514 static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
 515 {
 516         _memset_c_io(addr, 0x0101010101010101UL * c, len);
 517 }
 518
 519 #define __HAVE_ARCH_MEMSETW_IO
 520 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
 521 {
 522         _memset_c_io(addr, 0x0001000100010001UL * c, len);
 523 }
 524
 525 /*
 526  * String versions of in/out ops:
 527  */
 528 extern void insb (unsigned long port, void *dst, unsigned long count);
 529 extern void insw (unsigned long port, void *dst, unsigned long count);
 530 extern void insl (unsigned long port, void *dst, unsigned long count);
 531 extern void outsb (unsigned long port, const void *src, unsigned long count);
 532 extern void outsw (unsigned long port, const void *src, unsigned long count);
 533 extern void outsl (unsigned long port, const void *src, unsigned long count);
 534
 535 /*
 536  * The Alpha Jensen hardware for some rather strange reason puts
 537  * the RTC clock at 0x170 instead of 0x70. Probably due to some
 538  * misguided idea about using 0x70 for NMI stuff.
 539  *
 540  * These defines will override the defaults when doing RTC queries
 541  */
 542
 543 #ifdef CONFIG_ALPHA_GENERIC
 544 # define RTC_PORT(x)    ((x) + alpha_mv.rtc_port)
 545 #else
 546 # ifdef CONFIG_ALPHA_JENSEN
 547 #  define RTC_PORT(x)   (0x170+(x))
 548 # else
 549 #  define RTC_PORT(x)   (0x70 + (x))
 550 # endif
 551 #endif
 552 #define RTC_ALWAYS_BCD  0
 553
 554 /*
 555  * Some mucking forons use if[n]def writeq to check if platform has it.
 556  * It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
 557  * to play with; for now just use cpp anti-recursion logics and make sure
 558  * that damn thing is defined and expands to itself.
 559  */
 560
 561 #define writeq writeq
 562 #define readq readq
 563
 564 /*
 565  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 566  * access
 567  */
 568 #define xlate_dev_mem_ptr(p)    __va(p)
 569
 570 /*
 571  * Convert a virtual cached pointer to an uncached pointer
 572  */
 573 #define xlate_dev_kmem_ptr(p)   p
 574
 575 #endif /* __KERNEL__ */
 576
 577 #endif /* __ALPHA_IO_H */