include/asm-ia64/io.h

   1 #ifndef _ASM_IA64_IO_H
   2 #define _ASM_IA64_IO_H
   3
   4 /*
   5  * This file contains the definitions for the emulated IO instructions
   6  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
   7  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
   8  * versions of the single-IO instructions (inb_p/inw_p/..).
   9  *
  10  * This file is not meant to be obfuscating: it's just complicated to
  11  * (a) handle it all in a way that makes gcc able to optimize it as
  12  * well as possible and (b) trying to avoid writing the same thing
  13  * over and over again with slight variations and possibly making a
  14  * mistake somewhere.
  15  *
  16  * Copyright (C) 1998-2003 Hewlett-Packard Co
  17  *      David Mosberger-Tang <davidm@hpl.hp.com>
  18  * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
  19  * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
  20  */
  21
  22 /* We don't use IO slowdowns on the ia64, but.. */
  23 #define __SLOW_DOWN_IO  do { } while (0)
  24 #define SLOW_DOWN_IO    do { } while (0)
  25
  26 #define __IA64_UNCACHED_OFFSET  RGN_BASE(RGN_UNCACHED)
  27
  28 /*
  29  * The legacy I/O space defined by the ia64 architecture supports only 65536 ports, but
  30  * large machines may have multiple other I/O spaces so we can't place any a priori limit
  31  * on IO_SPACE_LIMIT.  These additional spaces are described in ACPI.
  32  */
  33 #define IO_SPACE_LIMIT          0xffffffffffffffffUL
  34
  35 #define MAX_IO_SPACES_BITS              8
  36 #define MAX_IO_SPACES                   (1UL << MAX_IO_SPACES_BITS)
  37 #define IO_SPACE_BITS                   24
  38 #define IO_SPACE_SIZE                   (1UL << IO_SPACE_BITS)
  39
  40 #define IO_SPACE_NR(port)               ((port) >> IO_SPACE_BITS)
  41 #define IO_SPACE_BASE(space)            ((space) << IO_SPACE_BITS)
  42 #define IO_SPACE_PORT(port)             ((port) & (IO_SPACE_SIZE - 1))
  43
  44 #define IO_SPACE_SPARSE_ENCODING(p)     ((((p) >> 2) << 12) | ((p) & 0xfff))
  45
  46 struct io_space {
  47         unsigned long mmio_base;        /* base in MMIO space */
  48         int sparse;
  49 };
  50
  51 extern struct io_space io_space[];
  52 extern unsigned int num_io_spaces;
  53
  54 # ifdef __KERNEL__
  55
  56 /*
  57  * All MMIO iomem cookies are in region 6; anything less is a PIO cookie:
  58  *      0xCxxxxxxxxxxxxxxx      MMIO cookie (return from ioremap)
  59  *      0x000000001SPPPPPP      PIO cookie (S=space number, P..P=port)
  60  *
  61  * ioread/writeX() uses the leading 1 in PIO cookies (PIO_OFFSET) to catch
  62  * code that uses bare port numbers without the prerequisite pci_iomap().
  63  */
  64 #define PIO_OFFSET              (1UL << (MAX_IO_SPACES_BITS + IO_SPACE_BITS))
  65 #define PIO_MASK                (PIO_OFFSET - 1)
  66 #define PIO_RESERVED            __IA64_UNCACHED_OFFSET
  67 #define HAVE_ARCH_PIO_SIZE
  68
  69 #include <asm/intrinsics.h>
  70 #include <asm/machvec.h>
  71 #include <asm/page.h>
  72 #include <asm/system.h>
  73 #include <asm-generic/iomap.h>
  74
  75 /*
  76  * Change virtual addresses to physical addresses and vv.
  77  */
  78 static inline unsigned long
  79 virt_to_phys (volatile void *address)
  80 {
  81         return (unsigned long) address - PAGE_OFFSET;
  82 }
  83
  84 static inline void*
  85 phys_to_virt (unsigned long address)
  86 {
  87         return (void *) (address + PAGE_OFFSET);
  88 }
  89
  90 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
  91 extern u64 kern_mem_attribute (unsigned long phys_addr, unsigned long size);
  92 extern int valid_phys_addr_range (unsigned long addr, size_t count); /* efi.c */
  93 extern int valid_mmap_phys_addr_range (unsigned long pfn, size_t count);
  94
  95 /*
  96  * The following two macros are deprecated and scheduled for removal.
  97  * Please use the PCI-DMA interface defined in <asm/pci.h> instead.
  98  */
  99 #define bus_to_virt     phys_to_virt
 100 #define virt_to_bus     virt_to_phys
 101 #define page_to_bus     page_to_phys
 102
 103 # endif /* KERNEL */
 104
 105 /*
 106  * Memory fence w/accept.  This should never be used in code that is
 107  * not IA-64 specific.
 108  */
 109 #define __ia64_mf_a()   ia64_mfa()
 110
 111 /**
 112  * ___ia64_mmiowb - I/O write barrier
 113  *
 114  * Ensure ordering of I/O space writes.  This will make sure that writes
 115  * following the barrier will arrive after all previous writes.  For most
 116  * ia64 platforms, this is a simple 'mf.a' instruction.
 117  *
 118  * See Documentation/DocBook/deviceiobook.tmpl for more information.
 119  */
 120 static inline void ___ia64_mmiowb(void)
 121 {
 122         ia64_mfa();
 123 }
 124
 125 static inline void*
 126 __ia64_mk_io_addr (unsigned long port)
 127 {
 128         struct io_space *space;
 129         unsigned long offset;
 130
 131         space = &io_space[IO_SPACE_NR(port)];
 132         port = IO_SPACE_PORT(port);
 133         if (space->sparse)
 134                 offset = IO_SPACE_SPARSE_ENCODING(port);
 135         else
 136                 offset = port;
 137
 138         return (void *) (space->mmio_base | offset);
 139 }
 140
 141 #define __ia64_inb      ___ia64_inb
 142 #define __ia64_inw      ___ia64_inw
 143 #define __ia64_inl      ___ia64_inl
 144 #define __ia64_outb     ___ia64_outb
 145 #define __ia64_outw     ___ia64_outw
 146 #define __ia64_outl     ___ia64_outl
 147 #define __ia64_readb    ___ia64_readb
 148 #define __ia64_readw    ___ia64_readw
 149 #define __ia64_readl    ___ia64_readl
 150 #define __ia64_readq    ___ia64_readq
 151 #define __ia64_readb_relaxed    ___ia64_readb
 152 #define __ia64_readw_relaxed    ___ia64_readw
 153 #define __ia64_readl_relaxed    ___ia64_readl
 154 #define __ia64_readq_relaxed    ___ia64_readq
 155 #define __ia64_writeb   ___ia64_writeb
 156 #define __ia64_writew   ___ia64_writew
 157 #define __ia64_writel   ___ia64_writel
 158 #define __ia64_writeq   ___ia64_writeq
 159 #define __ia64_mmiowb   ___ia64_mmiowb
 160
 161 /*
 162  * For the in/out routines, we need to do "mf.a" _after_ doing the I/O access to ensure
 163  * that the access has completed before executing other I/O accesses.  Since we're doing
 164  * the accesses through an uncachable (UC) translation, the CPU will execute them in
 165  * program order.  However, we still need to tell the compiler not to shuffle them around
 166  * during optimization, which is why we use "volatile" pointers.
 167  */
 168
 169 static inline unsigned int
 170 ___ia64_inb (unsigned long port)
 171 {
 172         volatile unsigned char *addr = __ia64_mk_io_addr(port);
 173         unsigned char ret;
 174
 175         ret = *addr;
 176         __ia64_mf_a();
 177         return ret;
 178 }
 179
 180 static inline unsigned int
 181 ___ia64_inw (unsigned long port)
 182 {
 183         volatile unsigned short *addr = __ia64_mk_io_addr(port);
 184         unsigned short ret;
 185
 186         ret = *addr;
 187         __ia64_mf_a();
 188         return ret;
 189 }
 190
 191 static inline unsigned int
 192 ___ia64_inl (unsigned long port)
 193 {
 194         volatile unsigned int *addr = __ia64_mk_io_addr(port);
 195         unsigned int ret;
 196
 197         ret = *addr;
 198         __ia64_mf_a();
 199         return ret;
 200 }
 201
 202 static inline void
 203 ___ia64_outb (unsigned char val, unsigned long port)
 204 {
 205         volatile unsigned char *addr = __ia64_mk_io_addr(port);
 206
 207         *addr = val;
 208         __ia64_mf_a();
 209 }
 210
 211 static inline void
 212 ___ia64_outw (unsigned short val, unsigned long port)
 213 {
 214         volatile unsigned short *addr = __ia64_mk_io_addr(port);
 215
 216         *addr = val;
 217         __ia64_mf_a();
 218 }
 219
 220 static inline void
 221 ___ia64_outl (unsigned int val, unsigned long port)
 222 {
 223         volatile unsigned int *addr = __ia64_mk_io_addr(port);
 224
 225         *addr = val;
 226         __ia64_mf_a();
 227 }
 228
 229 static inline void
 230 __insb (unsigned long port, void *dst, unsigned long count)
 231 {
 232         unsigned char *dp = dst;
 233
 234         while (count--)
 235                 *dp++ = platform_inb(port);
 236 }
 237
 238 static inline void
 239 __insw (unsigned long port, void *dst, unsigned long count)
 240 {
 241         unsigned short *dp = dst;
 242
 243         while (count--)
 244                 *dp++ = platform_inw(port);
 245 }
 246
 247 static inline void
 248 __insl (unsigned long port, void *dst, unsigned long count)
 249 {
 250         unsigned int *dp = dst;
 251
 252         while (count--)
 253                 *dp++ = platform_inl(port);
 254 }
 255
 256 static inline void
 257 __outsb (unsigned long port, const void *src, unsigned long count)
 258 {
 259         const unsigned char *sp = src;
 260
 261         while (count--)
 262                 platform_outb(*sp++, port);
 263 }
 264
 265 static inline void
 266 __outsw (unsigned long port, const void *src, unsigned long count)
 267 {
 268         const unsigned short *sp = src;
 269
 270         while (count--)
 271                 platform_outw(*sp++, port);
 272 }
 273
 274 static inline void
 275 __outsl (unsigned long port, const void *src, unsigned long count)
 276 {
 277         const unsigned int *sp = src;
 278
 279         while (count--)
 280                 platform_outl(*sp++, port);
 281 }
 282
 283 /*
 284  * Unfortunately, some platforms are broken and do not follow the IA-64 architecture
 285  * specification regarding legacy I/O support.  Thus, we have to make these operations
 286  * platform dependent...
 287  */
 288 #define __inb           platform_inb
 289 #define __inw           platform_inw
 290 #define __inl           platform_inl
 291 #define __outb          platform_outb
 292 #define __outw          platform_outw
 293 #define __outl          platform_outl
 294 #define __mmiowb        platform_mmiowb
 295
 296 #define inb(p)          __inb(p)
 297 #define inw(p)          __inw(p)
 298 #define inl(p)          __inl(p)
 299 #define insb(p,d,c)     __insb(p,d,c)
 300 #define insw(p,d,c)     __insw(p,d,c)
 301 #define insl(p,d,c)     __insl(p,d,c)
 302 #define outb(v,p)       __outb(v,p)
 303 #define outw(v,p)       __outw(v,p)
 304 #define outl(v,p)       __outl(v,p)
 305 #define outsb(p,s,c)    __outsb(p,s,c)
 306 #define outsw(p,s,c)    __outsw(p,s,c)
 307 #define outsl(p,s,c)    __outsl(p,s,c)
 308 #define mmiowb()        __mmiowb()
 309
 310 /*
 311  * The address passed to these functions are ioremap()ped already.
 312  *
 313  * We need these to be machine vectors since some platforms don't provide
 314  * DMA coherence via PIO reads (PCI drivers and the spec imply that this is
 315  * a good idea).  Writes are ok though for all existing ia64 platforms (and
 316  * hopefully it'll stay that way).
 317  */
 318 static inline unsigned char
 319 ___ia64_readb (const volatile void __iomem *addr)
 320 {
 321         return *(volatile unsigned char __force *)addr;
 322 }
 323
 324 static inline unsigned short
 325 ___ia64_readw (const volatile void __iomem *addr)
 326 {
 327         return *(volatile unsigned short __force *)addr;
 328 }
 329
 330 static inline unsigned int
 331 ___ia64_readl (const volatile void __iomem *addr)
 332 {
 333         return *(volatile unsigned int __force *) addr;
 334 }
 335
 336 static inline unsigned long
 337 ___ia64_readq (const volatile void __iomem *addr)
 338 {
 339         return *(volatile unsigned long __force *) addr;
 340 }
 341
 342 static inline void
 343 __writeb (unsigned char val, volatile void __iomem *addr)
 344 {
 345         *(volatile unsigned char __force *) addr = val;
 346 }
 347
 348 static inline void
 349 __writew (unsigned short val, volatile void __iomem *addr)
 350 {
 351         *(volatile unsigned short __force *) addr = val;
 352 }
 353
 354 static inline void
 355 __writel (unsigned int val, volatile void __iomem *addr)
 356 {
 357         *(volatile unsigned int __force *) addr = val;
 358 }
 359
 360 static inline void
 361 __writeq (unsigned long val, volatile void __iomem *addr)
 362 {
 363         *(volatile unsigned long __force *) addr = val;
 364 }
 365
 366 #define __readb         platform_readb
 367 #define __readw         platform_readw
 368 #define __readl         platform_readl
 369 #define __readq         platform_readq
 370 #define __readb_relaxed platform_readb_relaxed
 371 #define __readw_relaxed platform_readw_relaxed
 372 #define __readl_relaxed platform_readl_relaxed
 373 #define __readq_relaxed platform_readq_relaxed
 374
 375 #define readb(a)        __readb((a))
 376 #define readw(a)        __readw((a))
 377 #define readl(a)        __readl((a))
 378 #define readq(a)        __readq((a))
 379 #define readb_relaxed(a)        __readb_relaxed((a))
 380 #define readw_relaxed(a)        __readw_relaxed((a))
 381 #define readl_relaxed(a)        __readl_relaxed((a))
 382 #define readq_relaxed(a)        __readq_relaxed((a))
 383 #define __raw_readb     readb
 384 #define __raw_readw     readw
 385 #define __raw_readl     readl
 386 #define __raw_readq     readq
 387 #define __raw_readb_relaxed     readb_relaxed
 388 #define __raw_readw_relaxed     readw_relaxed
 389 #define __raw_readl_relaxed     readl_relaxed
 390 #define __raw_readq_relaxed     readq_relaxed
 391 #define writeb(v,a)     __writeb((v), (a))
 392 #define writew(v,a)     __writew((v), (a))
 393 #define writel(v,a)     __writel((v), (a))
 394 #define writeq(v,a)     __writeq((v), (a))
 395 #define __raw_writeb    writeb
 396 #define __raw_writew    writew
 397 #define __raw_writel    writel
 398 #define __raw_writeq    writeq
 399
 400 #ifndef inb_p
 401 # define inb_p          inb
 402 #endif
 403 #ifndef inw_p
 404 # define inw_p          inw
 405 #endif
 406 #ifndef inl_p
 407 # define inl_p          inl
 408 #endif
 409
 410 #ifndef outb_p
 411 # define outb_p         outb
 412 #endif
 413 #ifndef outw_p
 414 # define outw_p         outw
 415 #endif
 416 #ifndef outl_p
 417 # define outl_p         outl
 418 #endif
 419
 420 # ifdef __KERNEL__
 421
 422 extern void __iomem * ioremap(unsigned long offset, unsigned long size);
 423 extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
 424 extern void iounmap (volatile void __iomem *addr);
 425
 426 /*
 427  * String version of IO memory access ops:
 428  */
 429 extern void memcpy_fromio(void *dst, const volatile void __iomem *src, long n);
 430 extern void memcpy_toio(volatile void __iomem *dst, const void *src, long n);
 431 extern void memset_io(volatile void __iomem *s, int c, long n);
 432
 433 # endif /* __KERNEL__ */
 434
 435 /*
 436  * Enabling BIO_VMERGE_BOUNDARY forces us to turn off I/O MMU bypassing.  It is said that
 437  * BIO-level virtual merging can give up to 4% performance boost (not verified for ia64).
 438  * On the other hand, we know that I/O MMU bypassing gives ~8% performance improvement on
 439  * SPECweb-like workloads on zx1-based machines.  Thus, for now we favor I/O MMU bypassing
 440  * over BIO-level virtual merging.
 441  */
 442 extern unsigned long ia64_max_iommu_merge_mask;
 443 #if 1
 444 #define BIO_VMERGE_BOUNDARY     0
 445 #else
 446 /*
 447  * It makes no sense at all to have this BIO_VMERGE_BOUNDARY macro here.  Should be
 448  * replaced by dma_merge_mask() or something of that sort.  Note: the only way
 449  * BIO_VMERGE_BOUNDARY is used is to mask off bits.  Effectively, our definition gets
 450  * expanded into:
 451  *
 452  *      addr & ((ia64_max_iommu_merge_mask + 1) - 1) == (addr & ia64_max_iommu_vmerge_mask)
 453  *
 454  * which is precisely what we want.
 455  */
 456 #define BIO_VMERGE_BOUNDARY     (ia64_max_iommu_merge_mask + 1)
 457 #endif
 458
 459 #endif /* _ASM_IA64_IO_H */