include/asm-powerpc/io.h

   1 #ifndef _ASM_POWERPC_IO_H
   2 #define _ASM_POWERPC_IO_H
   3 #ifdef __KERNEL__
   4
   5 /*
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 /* Check of existence of legacy devices */
  13 extern int check_legacy_ioport(unsigned long base_port);
  14 #define I8042_DATA_REG  0x60
  15 #define FDC_BASE        0x3f0
  16 /* only relevant for PReP */
  17 #define _PIDXR          0x279
  18 #define _PNPWRP         0xa79
  19 #define PNPBIOS_BASE    0xf000
  20
  21 #include <linux/compiler.h>
  22 #include <asm/page.h>
  23 #include <asm/byteorder.h>
  24 #include <asm/synch.h>
  25 #include <asm/delay.h>
  26 #include <asm/mmu.h>
  27
  28 #include <asm-generic/iomap.h>
  29
  30 #ifdef CONFIG_PPC64
  31 #include <asm/paca.h>
  32 #endif
  33
  34 #define SIO_CONFIG_RA   0x398
  35 #define SIO_CONFIG_RD   0x399
  36
  37 #define SLOW_DOWN_IO
  38
  39 /* 32 bits uses slightly different variables for the various IO
  40  * bases. Most of this file only uses _IO_BASE though which we
  41  * define properly based on the platform
  42  */
  43 #ifndef CONFIG_PCI
  44 #define _IO_BASE        0
  45 #define _ISA_MEM_BASE   0
  46 #define PCI_DRAM_OFFSET 0
  47 #elif defined(CONFIG_PPC32)
  48 #define _IO_BASE        isa_io_base
  49 #define _ISA_MEM_BASE   isa_mem_base
  50 #define PCI_DRAM_OFFSET pci_dram_offset
  51 #else
  52 #define _IO_BASE        pci_io_base
  53 #define _ISA_MEM_BASE   isa_mem_base
  54 #define PCI_DRAM_OFFSET 0
  55 #endif
  56
  57 extern unsigned long isa_io_base;
  58 extern unsigned long pci_io_base;
  59 extern unsigned long pci_dram_offset;
  60
  61 extern resource_size_t isa_mem_base;
  62
  63 #if defined(CONFIG_PPC32) && defined(CONFIG_PPC_INDIRECT_IO)
  64 #error CONFIG_PPC_INDIRECT_IO is not yet supported on 32 bits
  65 #endif
  66
  67 /*
  68  *
  69  * Low level MMIO accessors
  70  *
  71  * This provides the non-bus specific accessors to MMIO. Those are PowerPC
  72  * specific and thus shouldn't be used in generic code. The accessors
  73  * provided here are:
  74  *
  75  *      in_8, in_le16, in_be16, in_le32, in_be32, in_le64, in_be64
  76  *      out_8, out_le16, out_be16, out_le32, out_be32, out_le64, out_be64
  77  *      _insb, _insw_ns, _insl_ns, _outsb, _outsw_ns, _outsl_ns
  78  *
  79  * Those operate directly on a kernel virtual address. Note that the prototype
  80  * for the out_* accessors has the arguments in opposite order from the usual
  81  * linux PCI accessors. Unlike those, they take the address first and the value
  82  * next.
  83  *
  84  * Note: I might drop the _ns suffix on the stream operations soon as it is
  85  * simply normal for stream operations to not swap in the first place.
  86  *
  87  */
  88
  89 #ifdef CONFIG_PPC64
  90 #define IO_SET_SYNC_FLAG()      do { local_paca->io_sync = 1; } while(0)
  91 #else
  92 #define IO_SET_SYNC_FLAG()
  93 #endif
  94
  95 #define DEF_MMIO_IN(name, type, insn)                                   \
  96 static inline type name(const volatile type __iomem *addr)              \
  97 {                                                                       \
  98         type ret;                                                       \
  99         __asm__ __volatile__("sync;" insn ";twi 0,%0,0;isync"           \
 100                 : "=r" (ret) : "r" (addr), "m" (*addr));                \
 101         return ret;                                                     \
 102 }
 103
 104 #define DEF_MMIO_OUT(name, type, insn)                                  \
 105 static inline void name(volatile type __iomem *addr, type val)          \
 106 {                                                                       \
 107         __asm__ __volatile__("sync;" insn                               \
 108                 : "=m" (*addr) : "r" (val), "r" (addr));                \
 109         IO_SET_SYNC_FLAG();                                     \
 110 }
 111
 112
 113 #define DEF_MMIO_IN_BE(name, size, insn) \
 114         DEF_MMIO_IN(name, u##size, __stringify(insn)"%U2%X2 %0,%2")
 115 #define DEF_MMIO_IN_LE(name, size, insn) \
 116         DEF_MMIO_IN(name, u##size, __stringify(insn)" %0,0,%1")
 117
 118 #define DEF_MMIO_OUT_BE(name, size, insn) \
 119         DEF_MMIO_OUT(name, u##size, __stringify(insn)"%U0%X0 %1,%0")
 120 #define DEF_MMIO_OUT_LE(name, size, insn) \
 121         DEF_MMIO_OUT(name, u##size, __stringify(insn)" %1,0,%2")
 122
 123 DEF_MMIO_IN_BE(in_8,     8, lbz);
 124 DEF_MMIO_IN_BE(in_be16, 16, lhz);
 125 DEF_MMIO_IN_BE(in_be32, 32, lwz);
 126 DEF_MMIO_IN_LE(in_le16, 16, lhbrx);
 127 DEF_MMIO_IN_LE(in_le32, 32, lwbrx);
 128
 129 DEF_MMIO_OUT_BE(out_8,     8, stb);
 130 DEF_MMIO_OUT_BE(out_be16, 16, sth);
 131 DEF_MMIO_OUT_BE(out_be32, 32, stw);
 132 DEF_MMIO_OUT_LE(out_le16, 16, sthbrx);
 133 DEF_MMIO_OUT_LE(out_le32, 32, stwbrx);
 134
 135 #ifdef __powerpc64__
 136 DEF_MMIO_OUT_BE(out_be64, 64, std);
 137 DEF_MMIO_IN_BE(in_be64, 64, ld);
 138
 139 /* There is no asm instructions for 64 bits reverse loads and stores */
 140 static inline u64 in_le64(const volatile u64 __iomem *addr)
 141 {
 142         return swab64(in_be64(addr));
 143 }
 144
 145 static inline void out_le64(volatile u64 __iomem *addr, u64 val)
 146 {
 147         out_be64(addr, swab64(val));
 148 }
 149 #endif /* __powerpc64__ */
 150
 151 /*
 152  * Low level IO stream instructions are defined out of line for now
 153  */
 154 extern void _insb(const volatile u8 __iomem *addr, void *buf, long count);
 155 extern void _outsb(volatile u8 __iomem *addr,const void *buf,long count);
 156 extern void _insw_ns(const volatile u16 __iomem *addr, void *buf, long count);
 157 extern void _outsw_ns(volatile u16 __iomem *addr, const void *buf, long count);
 158 extern void _insl_ns(const volatile u32 __iomem *addr, void *buf, long count);
 159 extern void _outsl_ns(volatile u32 __iomem *addr, const void *buf, long count);
 160
 161 /* The _ns naming is historical and will be removed. For now, just #define
 162  * the non _ns equivalent names
 163  */
 164 #define _insw   _insw_ns
 165 #define _insl   _insl_ns
 166 #define _outsw  _outsw_ns
 167 #define _outsl  _outsl_ns
 168
 169
 170 /*
 171  * memset_io, memcpy_toio, memcpy_fromio base implementations are out of line
 172  */
 173
 174 extern void _memset_io(volatile void __iomem *addr, int c, unsigned long n);
 175 extern void _memcpy_fromio(void *dest, const volatile void __iomem *src,
 176                            unsigned long n);
 177 extern void _memcpy_toio(volatile void __iomem *dest, const void *src,
 178                          unsigned long n);
 179
 180 /*
 181  *
 182  * PCI and standard ISA accessors
 183  *
 184  * Those are globally defined linux accessors for devices on PCI or ISA
 185  * busses. They follow the Linux defined semantics. The current implementation
 186  * for PowerPC is as close as possible to the x86 version of these, and thus
 187  * provides fairly heavy weight barriers for the non-raw versions
 188  *
 189  * In addition, they support a hook mechanism when CONFIG_PPC_INDIRECT_IO
 190  * allowing the platform to provide its own implementation of some or all
 191  * of the accessors.
 192  */
 193
 194 /*
 195  * Include the EEH definitions when EEH is enabled only so they don't get
 196  * in the way when building for 32 bits
 197  */
 198 #ifdef CONFIG_EEH
 199 #include <asm/eeh.h>
 200 #endif
 201
 202 /* Shortcut to the MMIO argument pointer */
 203 #define PCI_IO_ADDR     volatile void __iomem *
 204
 205 /* Indirect IO address tokens:
 206  *
 207  * When CONFIG_PPC_INDIRECT_IO is set, the platform can provide hooks
 208  * on all IOs. (Note that this is all 64 bits only for now)
 209  *
 210  * To help platforms who may need to differenciate MMIO addresses in
 211  * their hooks, a bitfield is reserved for use by the platform near the
 212  * top of MMIO addresses (not PIO, those have to cope the hard way).
 213  *
 214  * This bit field is 12 bits and is at the top of the IO virtual
 215  * addresses PCI_IO_INDIRECT_TOKEN_MASK.
 216  *
 217  * The kernel virtual space is thus:
 218  *
 219  *  0xD000000000000000          : vmalloc
 220  *  0xD000080000000000          : PCI PHB IO space
 221  *  0xD000080080000000          : ioremap
 222  *  0xD0000fffffffffff          : end of ioremap region
 223  *
 224  * Since the top 4 bits are reserved as the region ID, we use thus
 225  * the next 12 bits and keep 4 bits available for the future if the
 226  * virtual address space is ever to be extended.
 227  *
 228  * The direct IO mapping operations will then mask off those bits
 229  * before doing the actual access, though that only happen when
 230  * CONFIG_PPC_INDIRECT_IO is set, thus be careful when you use that
 231  * mechanism
 232  */
 233
 234 #ifdef CONFIG_PPC_INDIRECT_IO
 235 #define PCI_IO_IND_TOKEN_MASK   0x0fff000000000000ul
 236 #define PCI_IO_IND_TOKEN_SHIFT  48
 237 #define PCI_FIX_ADDR(addr)                                              \
 238         ((PCI_IO_ADDR)(((unsigned long)(addr)) & ~PCI_IO_IND_TOKEN_MASK))
 239 #define PCI_GET_ADDR_TOKEN(addr)                                        \
 240         (((unsigned long)(addr) & PCI_IO_IND_TOKEN_MASK) >>             \
 241                 PCI_IO_IND_TOKEN_SHIFT)
 242 #define PCI_SET_ADDR_TOKEN(addr, token)                                 \
 243 do {                                                                    \
 244         unsigned long __a = (unsigned long)(addr);                      \
 245         __a &= ~PCI_IO_IND_TOKEN_MASK;                                  \
 246         __a |= ((unsigned long)(token)) << PCI_IO_IND_TOKEN_SHIFT;      \
 247         (addr) = (void __iomem *)__a;                                   \
 248 } while(0)
 249 #else
 250 #define PCI_FIX_ADDR(addr) (addr)
 251 #endif
 252
 253
 254 /*
 255  * Non ordered and non-swapping "raw" accessors
 256  */
 257
 258 static inline unsigned char __raw_readb(const volatile void __iomem *addr)
 259 {
 260         return *(volatile unsigned char __force *)PCI_FIX_ADDR(addr);
 261 }
 262 static inline unsigned short __raw_readw(const volatile void __iomem *addr)
 263 {
 264         return *(volatile unsigned short __force *)PCI_FIX_ADDR(addr);
 265 }
 266 static inline unsigned int __raw_readl(const volatile void __iomem *addr)
 267 {
 268         return *(volatile unsigned int __force *)PCI_FIX_ADDR(addr);
 269 }
 270 static inline void __raw_writeb(unsigned char v, volatile void __iomem *addr)
 271 {
 272         *(volatile unsigned char __force *)PCI_FIX_ADDR(addr) = v;
 273 }
 274 static inline void __raw_writew(unsigned short v, volatile void __iomem *addr)
 275 {
 276         *(volatile unsigned short __force *)PCI_FIX_ADDR(addr) = v;
 277 }
 278 static inline void __raw_writel(unsigned int v, volatile void __iomem *addr)
 279 {
 280         *(volatile unsigned int __force *)PCI_FIX_ADDR(addr) = v;
 281 }
 282
 283 #ifdef __powerpc64__
 284 static inline unsigned long __raw_readq(const volatile void __iomem *addr)
 285 {
 286         return *(volatile unsigned long __force *)PCI_FIX_ADDR(addr);
 287 }
 288 static inline void __raw_writeq(unsigned long v, volatile void __iomem *addr)
 289 {
 290         *(volatile unsigned long __force *)PCI_FIX_ADDR(addr) = v;
 291 }
 292 #endif /* __powerpc64__ */
 293
 294 /*
 295  *
 296  * PCI PIO and MMIO accessors.
 297  *
 298  *
 299  * On 32 bits, PIO operations have a recovery mechanism in case they trigger
 300  * machine checks (which they occasionally do when probing non existing
 301  * IO ports on some platforms, like PowerMac and 8xx).
 302  * I always found it to be of dubious reliability and I am tempted to get
 303  * rid of it one of these days. So if you think it's important to keep it,
 304  * please voice up asap. We never had it for 64 bits and I do not intend
 305  * to port it over
 306  */
 307
 308 #ifdef CONFIG_PPC32
 309
 310 #define __do_in_asm(name, op)                           \
 311 static inline unsigned int name(unsigned int port)      \
 312 {                                                       \
 313         unsigned int x;                                 \
 314         __asm__ __volatile__(                           \
 315                 "sync\n"                                \
 316                 "0:"    op "    %0,0,%1\n"              \
 317                 "1:     twi     0,%0,0\n"               \
 318                 "2:     isync\n"                        \
 319                 "3:     nop\n"                          \
 320                 "4:\n"                                  \
 321                 ".section .fixup,\"ax\"\n"              \
 322                 "5:     li      %0,-1\n"                \
 323                 "       b       4b\n"                   \
 324                 ".previous\n"                           \
 325                 ".section __ex_table,\"a\"\n"           \
 326                 "       .align  2\n"                    \
 327                 "       .long   0b,5b\n"                \
 328                 "       .long   1b,5b\n"                \
 329                 "       .long   2b,5b\n"                \
 330                 "       .long   3b,5b\n"                \
 331                 ".previous"                             \
 332                 : "=&r" (x)                             \
 333                 : "r" (port + _IO_BASE));               \
 334         return x;                                       \
 335 }
 336
 337 #define __do_out_asm(name, op)                          \
 338 static inline void name(unsigned int val, unsigned int port) \
 339 {                                                       \
 340         __asm__ __volatile__(                           \
 341                 "sync\n"                                \
 342                 "0:" op " %0,0,%1\n"                    \
 343                 "1:     sync\n"                         \
 344                 "2:\n"                                  \
 345                 ".section __ex_table,\"a\"\n"           \
 346                 "       .align  2\n"                    \
 347                 "       .long   0b,2b\n"                \
 348                 "       .long   1b,2b\n"                \
 349                 ".previous"                             \
 350                 : : "r" (val), "r" (port + _IO_BASE));  \
 351 }
 352
 353 __do_in_asm(_rec_inb, "lbzx")
 354 __do_in_asm(_rec_inw, "lhbrx")
 355 __do_in_asm(_rec_inl, "lwbrx")
 356 __do_out_asm(_rec_outb, "stbx")
 357 __do_out_asm(_rec_outw, "sthbrx")
 358 __do_out_asm(_rec_outl, "stwbrx")
 359
 360 #endif /* CONFIG_PPC32 */
 361
 362 /* The "__do_*" operations below provide the actual "base" implementation
 363  * for each of the defined acccessor. Some of them use the out_* functions
 364  * directly, some of them still use EEH, though we might change that in the
 365  * future. Those macros below provide the necessary argument swapping and
 366  * handling of the IO base for PIO.
 367  *
 368  * They are themselves used by the macros that define the actual accessors
 369  * and can be used by the hooks if any.
 370  *
 371  * Note that PIO operations are always defined in terms of their corresonding
 372  * MMIO operations. That allows platforms like iSeries who want to modify the
 373  * behaviour of both to only hook on the MMIO version and get both. It's also
 374  * possible to hook directly at the toplevel PIO operation if they have to
 375  * be handled differently
 376  */
 377 #define __do_writeb(val, addr)  out_8(PCI_FIX_ADDR(addr), val)
 378 #define __do_writew(val, addr)  out_le16(PCI_FIX_ADDR(addr), val)
 379 #define __do_writel(val, addr)  out_le32(PCI_FIX_ADDR(addr), val)
 380 #define __do_writeq(val, addr)  out_le64(PCI_FIX_ADDR(addr), val)
 381 #define __do_writew_be(val, addr) out_be16(PCI_FIX_ADDR(addr), val)
 382 #define __do_writel_be(val, addr) out_be32(PCI_FIX_ADDR(addr), val)
 383 #define __do_writeq_be(val, addr) out_be64(PCI_FIX_ADDR(addr), val)
 384
 385 #ifdef CONFIG_EEH
 386 #define __do_readb(addr)        eeh_readb(PCI_FIX_ADDR(addr))
 387 #define __do_readw(addr)        eeh_readw(PCI_FIX_ADDR(addr))
 388 #define __do_readl(addr)        eeh_readl(PCI_FIX_ADDR(addr))
 389 #define __do_readq(addr)        eeh_readq(PCI_FIX_ADDR(addr))
 390 #define __do_readw_be(addr)     eeh_readw_be(PCI_FIX_ADDR(addr))
 391 #define __do_readl_be(addr)     eeh_readl_be(PCI_FIX_ADDR(addr))
 392 #define __do_readq_be(addr)     eeh_readq_be(PCI_FIX_ADDR(addr))
 393 #else /* CONFIG_EEH */
 394 #define __do_readb(addr)        in_8(PCI_FIX_ADDR(addr))
 395 #define __do_readw(addr)        in_le16(PCI_FIX_ADDR(addr))
 396 #define __do_readl(addr)        in_le32(PCI_FIX_ADDR(addr))
 397 #define __do_readq(addr)        in_le64(PCI_FIX_ADDR(addr))
 398 #define __do_readw_be(addr)     in_be16(PCI_FIX_ADDR(addr))
 399 #define __do_readl_be(addr)     in_be32(PCI_FIX_ADDR(addr))
 400 #define __do_readq_be(addr)     in_be64(PCI_FIX_ADDR(addr))
 401 #endif /* !defined(CONFIG_EEH) */
 402
 403 #ifdef CONFIG_PPC32
 404 #define __do_outb(val, port)    _rec_outb(val, port)
 405 #define __do_outw(val, port)    _rec_outw(val, port)
 406 #define __do_outl(val, port)    _rec_outl(val, port)
 407 #define __do_inb(port)          _rec_inb(port)
 408 #define __do_inw(port)          _rec_inw(port)
 409 #define __do_inl(port)          _rec_inl(port)
 410 #else /* CONFIG_PPC32 */
 411 #define __do_outb(val, port)    writeb(val,(PCI_IO_ADDR)_IO_BASE+port);
 412 #define __do_outw(val, port)    writew(val,(PCI_IO_ADDR)_IO_BASE+port);
 413 #define __do_outl(val, port)    writel(val,(PCI_IO_ADDR)_IO_BASE+port);
 414 #define __do_inb(port)          readb((PCI_IO_ADDR)_IO_BASE + port);
 415 #define __do_inw(port)          readw((PCI_IO_ADDR)_IO_BASE + port);
 416 #define __do_inl(port)          readl((PCI_IO_ADDR)_IO_BASE + port);
 417 #endif /* !CONFIG_PPC32 */
 418
 419 #ifdef CONFIG_EEH
 420 #define __do_readsb(a, b, n)    eeh_readsb(PCI_FIX_ADDR(a), (b), (n))
 421 #define __do_readsw(a, b, n)    eeh_readsw(PCI_FIX_ADDR(a), (b), (n))
 422 #define __do_readsl(a, b, n)    eeh_readsl(PCI_FIX_ADDR(a), (b), (n))
 423 #else /* CONFIG_EEH */
 424 #define __do_readsb(a, b, n)    _insb(PCI_FIX_ADDR(a), (b), (n))
 425 #define __do_readsw(a, b, n)    _insw(PCI_FIX_ADDR(a), (b), (n))
 426 #define __do_readsl(a, b, n)    _insl(PCI_FIX_ADDR(a), (b), (n))
 427 #endif /* !CONFIG_EEH */
 428 #define __do_writesb(a, b, n)   _outsb(PCI_FIX_ADDR(a),(b),(n))
 429 #define __do_writesw(a, b, n)   _outsw(PCI_FIX_ADDR(a),(b),(n))
 430 #define __do_writesl(a, b, n)   _outsl(PCI_FIX_ADDR(a),(b),(n))
 431
 432 #define __do_insb(p, b, n)      readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
 433 #define __do_insw(p, b, n)      readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
 434 #define __do_insl(p, b, n)      readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
 435 #define __do_outsb(p, b, n)     writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
 436 #define __do_outsw(p, b, n)     writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
 437 #define __do_outsl(p, b, n)     writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
 438
 439 #define __do_memset_io(addr, c, n)      \
 440                                 _memset_io(PCI_FIX_ADDR(addr), c, n)
 441 #define __do_memcpy_toio(dst, src, n)   \
 442                                 _memcpy_toio(PCI_FIX_ADDR(dst), src, n)
 443
 444 #ifdef CONFIG_EEH
 445 #define __do_memcpy_fromio(dst, src, n) \
 446                                 eeh_memcpy_fromio(dst, PCI_FIX_ADDR(src), n)
 447 #else /* CONFIG_EEH */
 448 #define __do_memcpy_fromio(dst, src, n) \
 449                                 _memcpy_fromio(dst,PCI_FIX_ADDR(src),n)
 450 #endif /* !CONFIG_EEH */
 451
 452 #ifdef CONFIG_PPC_INDIRECT_IO
 453 #define DEF_PCI_HOOK(x)         x
 454 #else
 455 #define DEF_PCI_HOOK(x)         NULL
 456 #endif
 457
 458 /* Structure containing all the hooks */
 459 extern struct ppc_pci_io {
 460
 461 #define DEF_PCI_AC_RET(name, ret, at, al)       ret (*name) at;
 462 #define DEF_PCI_AC_NORET(name, at, al)          void (*name) at;
 463
 464 #include <asm/io-defs.h>
 465
 466 #undef DEF_PCI_AC_RET
 467 #undef DEF_PCI_AC_NORET
 468
 469 } ppc_pci_io;
 470
 471 /* The inline wrappers */
 472 #define DEF_PCI_AC_RET(name, ret, at, al)                       \
 473 static inline ret name at                                       \
 474 {                                                               \
 475         if (DEF_PCI_HOOK(ppc_pci_io.name) != NULL)              \
 476                 return ppc_pci_io.name al;                      \
 477         return __do_##name al;                                  \
 478 }
 479
 480 #define DEF_PCI_AC_NORET(name, at, al)                          \
 481 static inline void name at                                      \
 482 {                                                               \
 483         if (DEF_PCI_HOOK(ppc_pci_io.name) != NULL)              \
 484                 ppc_pci_io.name al;                             \
 485         else                                                    \
 486                 __do_##name al;                                 \
 487 }
 488
 489 #include <asm/io-defs.h>
 490
 491 #undef DEF_PCI_AC_RET
 492 #undef DEF_PCI_AC_NORET
 493
 494 /* Some drivers check for the presence of readq & writeq with
 495  * a #ifdef, so we make them happy here.
 496  */
 497 #ifdef __powerpc64__
 498 #define readq   readq
 499 #define writeq  writeq
 500 #endif
 501
 502 /*
 503  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 504  * access
 505  */
 506 #define xlate_dev_mem_ptr(p)    __va(p)
 507
 508 /*
 509  * Convert a virtual cached pointer to an uncached pointer
 510  */
 511 #define xlate_dev_kmem_ptr(p)   p
 512
 513 /*
 514  * We don't do relaxed operations yet, at least not with this semantic
 515  */
 516 #define readb_relaxed(addr) readb(addr)
 517 #define readw_relaxed(addr) readw(addr)
 518 #define readl_relaxed(addr) readl(addr)
 519 #define readq_relaxed(addr) readq(addr)
 520
 521 #ifdef CONFIG_PPC32
 522 #define mmiowb()
 523 #else
 524 /*
 525  * Enforce synchronisation of stores vs. spin_unlock
 526  * (this does it explicitly, though our implementation of spin_unlock
 527  * does it implicitely too)
 528  */
 529 static inline void mmiowb(void)
 530 {
 531         unsigned long tmp;
 532
 533         __asm__ __volatile__("sync; li %0,0; stb %0,%1(13)"
 534         : "=&r" (tmp) : "i" (offsetof(struct paca_struct, io_sync))
 535         : "memory");
 536 }
 537 #endif /* !CONFIG_PPC32 */
 538
 539 static inline void iosync(void)
 540 {
 541         __asm__ __volatile__ ("sync" : : : "memory");
 542 }
 543
 544 /* Enforce in-order execution of data I/O.
 545  * No distinction between read/write on PPC; use eieio for all three.
 546  * Those are fairly week though. They don't provide a barrier between
 547  * MMIO and cacheable storage nor do they provide a barrier vs. locks,
 548  * they only provide barriers between 2 __raw MMIO operations and
 549  * possibly break write combining.
 550  */
 551 #define iobarrier_rw() eieio()
 552 #define iobarrier_r()  eieio()
 553 #define iobarrier_w()  eieio()
 554
 555
 556 /*
 557  * output pause versions need a delay at least for the
 558  * w83c105 ide controller in a p610.
 559  */
 560 #define inb_p(port)             inb(port)
 561 #define outb_p(val, port)       (udelay(1), outb((val), (port)))
 562 #define inw_p(port)             inw(port)
 563 #define outw_p(val, port)       (udelay(1), outw((val), (port)))
 564 #define inl_p(port)             inl(port)
 565 #define outl_p(val, port)       (udelay(1), outl((val), (port)))
 566
 567
 568 #define IO_SPACE_LIMIT ~(0UL)
 569
 570
 571 /**
 572  * ioremap     -   map bus memory into CPU space
 573  * @address:   bus address of the memory
 574  * @size:      size of the resource to map
 575  *
 576  * ioremap performs a platform specific sequence of operations to
 577  * make bus memory CPU accessible via the readb/readw/readl/writeb/
 578  * writew/writel functions and the other mmio helpers. The returned
 579  * address is not guaranteed to be usable directly as a virtual
 580  * address.
 581  *
 582  * We provide a few variations of it:
 583  *
 584  * * ioremap is the standard one and provides non-cacheable guarded mappings
 585  *   and can be hooked by the platform via ppc_md
 586  *
 587  * * ioremap_flags allows to specify the page flags as an argument and can
 588  *   also be hooked by the platform via ppc_md
 589  *
 590  * * ioremap_nocache is identical to ioremap
 591  *
 592  * * iounmap undoes such a mapping and can be hooked
 593  *
 594  * * __ioremap_at (and the pending __iounmap_at) are low level functions to
 595  *   create hand-made mappings for use only by the PCI code and cannot
 596  *   currently be hooked. Must be page aligned.
 597  *
 598  * * __ioremap is the low level implementation used by ioremap and
 599  *   ioremap_flags and cannot be hooked (but can be used by a hook on one
 600  *   of the previous ones)
 601  *
 602  * * __iounmap, is the low level implementation used by iounmap and cannot
 603  *   be hooked (but can be used by a hook on iounmap)
 604  *
 605  */
 606 extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
 607 extern void __iomem *ioremap_flags(phys_addr_t address, unsigned long size,
 608                                    unsigned long flags);
 609 #define ioremap_nocache(addr, size)     ioremap((addr), (size))
 610 extern void iounmap(volatile void __iomem *addr);
 611
 612 extern void __iomem *__ioremap(phys_addr_t, unsigned long size,
 613                                unsigned long flags);
 614 extern void __iounmap(volatile void __iomem *addr);
 615
 616 extern void __iomem * __ioremap_at(phys_addr_t pa, void *ea,
 617                                    unsigned long size, unsigned long flags);
 618 extern void __iounmap_at(void *ea, unsigned long size);
 619
 620 /*
 621  * When CONFIG_PPC_INDIRECT_IO is set, we use the generic iomap implementation
 622  * which needs some additional definitions here. They basically allow PIO
 623  * space overall to be 1GB. This will work as long as we never try to use
 624  * iomap to map MMIO below 1GB which should be fine on ppc64
 625  */
 626 #define HAVE_ARCH_PIO_SIZE              1
 627 #define PIO_OFFSET                      0x00000000UL
 628 #define PIO_MASK                        (FULL_IO_SIZE - 1)
 629 #define PIO_RESERVED                    (FULL_IO_SIZE)
 630
 631 #define mmio_read16be(addr)             readw_be(addr)
 632 #define mmio_read32be(addr)             readl_be(addr)
 633 #define mmio_write16be(val, addr)       writew_be(val, addr)
 634 #define mmio_write32be(val, addr)       writel_be(val, addr)
 635 #define mmio_insb(addr, dst, count)     readsb(addr, dst, count)
 636 #define mmio_insw(addr, dst, count)     readsw(addr, dst, count)
 637 #define mmio_insl(addr, dst, count)     readsl(addr, dst, count)
 638 #define mmio_outsb(addr, src, count)    writesb(addr, src, count)
 639 #define mmio_outsw(addr, src, count)    writesw(addr, src, count)
 640 #define mmio_outsl(addr, src, count)    writesl(addr, src, count)
 641
 642 /**
 643  *      virt_to_phys    -       map virtual addresses to physical
 644  *      @address: address to remap
 645  *
 646  *      The returned physical address is the physical (CPU) mapping for
 647  *      the memory address given. It is only valid to use this function on
 648  *      addresses directly mapped or allocated via kmalloc.
 649  *
 650  *      This function does not give bus mappings for DMA transfers. In
 651  *      almost all conceivable cases a device driver should not be using
 652  *      this function
 653  */
 654 static inline unsigned long virt_to_phys(volatile void * address)
 655 {
 656         return __pa((unsigned long)address);
 657 }
 658
 659 /**
 660  *      phys_to_virt    -       map physical address to virtual
 661  *      @address: address to remap
 662  *
 663  *      The returned virtual address is a current CPU mapping for
 664  *      the memory address given. It is only valid to use this function on
 665  *      addresses that have a kernel mapping
 666  *
 667  *      This function does not handle bus mappings for DMA transfers. In
 668  *      almost all conceivable cases a device driver should not be using
 669  *      this function
 670  */
 671 static inline void * phys_to_virt(unsigned long address)
 672 {
 673         return (void *)__va(address);
 674 }
 675
 676 /*
 677  * Change "struct page" to physical address.
 678  */
 679 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 680
 681 /* We do NOT want virtual merging, it would put too much pressure on
 682  * our iommu allocator. Instead, we want drivers to be smart enough
 683  * to coalesce sglists that happen to have been mapped in a contiguous
 684  * way by the iommu
 685  */
 686 #define BIO_VMERGE_BOUNDARY     0
 687
 688 /*
 689  * 32 bits still uses virt_to_bus() for it's implementation of DMA
 690  * mappings se we have to keep it defined here. We also have some old
 691  * drivers (shame shame shame) that use bus_to_virt() and haven't been
 692  * fixed yet so I need to define it here.
 693  */
 694 #ifdef CONFIG_PPC32
 695
 696 static inline unsigned long virt_to_bus(volatile void * address)
 697 {
 698         if (address == NULL)
 699                 return 0;
 700         return __pa(address) + PCI_DRAM_OFFSET;
 701 }
 702
 703 static inline void * bus_to_virt(unsigned long address)
 704 {
 705         if (address == 0)
 706                 return NULL;
 707         return __va(address - PCI_DRAM_OFFSET);
 708 }
 709
 710 #define page_to_bus(page)       (page_to_phys(page) + PCI_DRAM_OFFSET)
 711
 712 #endif /* CONFIG_PPC32 */
 713
 714 /* access ports */
 715 #define setbits32(_addr, _v) out_be32((_addr), in_be32(_addr) |  (_v))
 716 #define clrbits32(_addr, _v) out_be32((_addr), in_be32(_addr) & ~(_v))
 717
 718 #define setbits16(_addr, _v) out_be16((_addr), in_be16(_addr) |  (_v))
 719 #define clrbits16(_addr, _v) out_be16((_addr), in_be16(_addr) & ~(_v))
 720
 721 #define setbits8(_addr, _v) out_8((_addr), in_8(_addr) |  (_v))
 722 #define clrbits8(_addr, _v) out_8((_addr), in_8(_addr) & ~(_v))
 723
 724 /* Clear and set bits in one shot.  These macros can be used to clear and
 725  * set multiple bits in a register using a single read-modify-write.  These
 726  * macros can also be used to set a multiple-bit bit pattern using a mask,
 727  * by specifying the mask in the 'clear' parameter and the new bit pattern
 728  * in the 'set' parameter.
 729  */
 730
 731 #define clrsetbits(type, addr, clear, set) \
 732         out_##type((addr), (in_##type(addr) & ~(clear)) | (set))
 733
 734 #ifdef __powerpc64__
 735 #define clrsetbits_be64(addr, clear, set) clrsetbits(be64, addr, clear, set)
 736 #define clrsetbits_le64(addr, clear, set) clrsetbits(le64, addr, clear, set)
 737 #endif
 738
 739 #define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
 740 #define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
 741
 742 #define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
 743 #define clrsetbits_le16(addr, clear, set) clrsetbits(le32, addr, clear, set)
 744
 745 #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
 746
 747 #endif /* __KERNEL__ */
 748
 749 #endif /* _ASM_POWERPC_IO_H */