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