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 PNPBIOS_BASE    0xf000  /* only relevant for PReP */
  15
  16 #include <linux/compiler.h>
  17 #include <asm/page.h>
  18 #include <asm/byteorder.h>
  19 #include <asm/synch.h>
  20 #include <asm/delay.h>
  21 #include <asm/mmu.h>
  22
  23 #include <asm-generic/iomap.h>
  24
  25 #ifdef CONFIG_PPC64
  26 #include <asm/paca.h>
  27 #endif
  28
  29 #define SIO_CONFIG_RA   0x398
  30 #define SIO_CONFIG_RD   0x399
  31
  32 #define SLOW_DOWN_IO
  33
  34 /* 32 bits uses slightly different variables for the various IO
  35  * bases. Most of this file only uses _IO_BASE though which we
  36  * define properly based on the platform
  37  */
  38 #ifndef CONFIG_PCI
  39 #define _IO_BASE        0
  40 #define _ISA_MEM_BASE   0
  41 #define PCI_DRAM_OFFSET 0
  42 #elif defined(CONFIG_PPC32)
  43 #define _IO_BASE        isa_io_base
  44 #define _ISA_MEM_BASE   isa_mem_base
  45 #define PCI_DRAM_OFFSET pci_dram_offset
  46 #else
  47 #define _IO_BASE        pci_io_base
  48 #define _ISA_MEM_BASE   0
  49 #define PCI_DRAM_OFFSET 0
  50 #endif
  51
  52 extern unsigned long isa_io_base;
  53 extern unsigned long isa_mem_base;
  54 extern unsigned long pci_io_base;
  55 extern unsigned long pci_dram_offset;
  56
  57 #if defined(CONFIG_PPC32) && defined(CONFIG_PPC_INDIRECT_IO)
  58 #error CONFIG_PPC_INDIRECT_IO is not yet supported on 32 bits
  59 #endif
  60
  61 /*
  62  *
  63  * Low level MMIO accessors
  64  *
  65  * This provides the non-bus specific accessors to MMIO. Those are PowerPC
  66  * specific and thus shouldn't be used in generic code. The accessors
  67  * provided here are:
  68  *
  69  *      in_8, in_le16, in_be16, in_le32, in_be32, in_le64, in_be64
  70  *      out_8, out_le16, out_be16, out_le32, out_be32, out_le64, out_be64
  71  *      _insb, _insw_ns, _insl_ns, _outsb, _outsw_ns, _outsl_ns
  72  *
  73  * Those operate directly on a kernel virtual address. Note that the prototype
  74  * for the out_* accessors has the arguments in opposite order from the usual
  75  * linux PCI accessors. Unlike those, they take the address first and the value
  76  * next.
  77  *
  78  * Note: I might drop the _ns suffix on the stream operations soon as it is
  79  * simply normal for stream operations to not swap in the first place.
  80  *
  81  */
  82
  83 #ifdef CONFIG_PPC64
  84 #define IO_SET_SYNC_FLAG()      do { get_paca()->io_sync = 1; } while(0)
  85 #else
  86 #define IO_SET_SYNC_FLAG()
  87 #endif
  88
  89 #define DEF_MMIO_IN(name, type, insn)                                   \
  90 static inline type name(const volatile type __iomem *addr)              \
  91 {                                                                       \
  92         type ret;                                                       \
  93         __asm__ __volatile__("sync;" insn ";twi 0,%0,0;isync"           \
  94                 : "=r" (ret) : "r" (addr), "m" (*addr));                \
  95         return ret;                                                     \
  96 }
  97
  98 #define DEF_MMIO_OUT(name, type, insn)                                  \
  99 static inline void name(volatile type __iomem *addr, type val)          \
 100 {                                                                       \
 101         __asm__ __volatile__("sync;" insn                               \
 102                 : "=m" (*addr) : "r" (val), "r" (addr));                \
 103         IO_SET_SYNC_FLAG();                                     \
 104 }
 105
 106
 107 #define DEF_MMIO_IN_BE(name, size, insn) \
 108         DEF_MMIO_IN(name, u##size, __stringify(insn)"%U2%X2 %0,%2")
 109 #define DEF_MMIO_IN_LE(name, size, insn) \
 110         DEF_MMIO_IN(name, u##size, __stringify(insn)" %0,0,%1")
 111
 112 #define DEF_MMIO_OUT_BE(name, size, insn) \
 113         DEF_MMIO_OUT(name, u##size, __stringify(insn)"%U0%X0 %1,%0")
 114 #define DEF_MMIO_OUT_LE(name, size, insn) \
 115         DEF_MMIO_OUT(name, u##size, __stringify(insn)" %1,0,%2")
 116
 117 DEF_MMIO_IN_BE(in_8,     8, lbz);
 118 DEF_MMIO_IN_BE(in_be16, 16, lhz);
 119 DEF_MMIO_IN_BE(in_be32, 32, lwz);
 120 DEF_MMIO_IN_LE(in_le16, 16, lhbrx);
 121 DEF_MMIO_IN_LE(in_le32, 32, lwbrx);
 122
 123 DEF_MMIO_OUT_BE(out_8,     8, stb);
 124 DEF_MMIO_OUT_BE(out_be16, 16, sth);
 125 DEF_MMIO_OUT_BE(out_be32, 32, stw);
 126 DEF_MMIO_OUT_LE(out_le16, 16, sthbrx);
 127 DEF_MMIO_OUT_LE(out_le32, 32, stwbrx);
 128
 129 #ifdef __powerpc64__
 130 DEF_MMIO_OUT_BE(out_be64, 64, std);
 131 DEF_MMIO_IN_BE(in_be64, 64, ld);
 132
 133 /* There is no asm instructions for 64 bits reverse loads and stores */
 134 static inline u64 in_le64(const volatile u64 __iomem *addr)
 135 {
 136         return le64_to_cpu(in_be64(addr));
 137 }
 138
 139 static inline void out_le64(volatile u64 __iomem *addr, u64 val)
 140 {
 141         out_be64(addr, cpu_to_le64(val));
 142 }
 143 #endif /* __powerpc64__ */
 144
 145 /*
 146  * Low level IO stream instructions are defined out of line for now
 147  */
 148 extern void _insb(const volatile u8 __iomem *addr, void *buf, long count);
 149 extern void _outsb(volatile u8 __iomem *addr,const void *buf,long count);
 150 extern void _insw_ns(const volatile u16 __iomem *addr, void *buf, long count);
 151 extern void _outsw_ns(volatile u16 __iomem *addr, const void *buf, long count);
 152 extern void _insl_ns(const volatile u32 __iomem *addr, void *buf, long count);
 153 extern void _outsl_ns(volatile u32 __iomem *addr, const void *buf, long count);
 154
 155 /* The _ns naming is historical and will be removed. For now, just #define
 156  * the non _ns equivalent names
 157  */
 158 #define _insw   _insw_ns
 159 #define _insl   _insl_ns
 160 #define _outsw  _outsw_ns
 161 #define _outsl  _outsl_ns
 162
 163
 164 /*
 165  * memset_io, memcpy_toio, memcpy_fromio base implementations are out of line
 166  */
 167
 168 extern void _memset_io(volatile void __iomem *addr, int c, unsigned long n);
 169 extern void _memcpy_fromio(void *dest, const volatile void __iomem *src,
 170                            unsigned long n);
 171 extern void _memcpy_toio(volatile void __iomem *dest, const void *src,
 172                          unsigned long n);
 173
 174 /*
 175  *
 176  * PCI and standard ISA accessors
 177  *
 178  * Those are globally defined linux accessors for devices on PCI or ISA
 179  * busses. They follow the Linux defined semantics. The current implementation
 180  * for PowerPC is as close as possible to the x86 version of these, and thus
 181  * provides fairly heavy weight barriers for the non-raw versions
 182  *
 183  * In addition, they support a hook mechanism when CONFIG_PPC_INDIRECT_IO
 184  * allowing the platform to provide its own implementation of some or all
 185  * of the accessors.
 186  */
 187
 188
 189 /*
 190  * Non ordered and non-swapping "raw" accessors
 191  */
 192
 193 static inline unsigned char __raw_readb(const volatile void __iomem *addr)
 194 {
 195         return *(volatile unsigned char __force *)addr;
 196 }
 197 static inline unsigned short __raw_readw(const volatile void __iomem *addr)
 198 {
 199         return *(volatile unsigned short __force *)addr;
 200 }
 201 static inline unsigned int __raw_readl(const volatile void __iomem *addr)
 202 {
 203         return *(volatile unsigned int __force *)addr;
 204 }
 205 static inline void __raw_writeb(unsigned char v, volatile void __iomem *addr)
 206 {
 207         *(volatile unsigned char __force *)addr = v;
 208 }
 209 static inline void __raw_writew(unsigned short v, volatile void __iomem *addr)
 210 {
 211         *(volatile unsigned short __force *)addr = v;
 212 }
 213 static inline void __raw_writel(unsigned int v, volatile void __iomem *addr)
 214 {
 215         *(volatile unsigned int __force *)addr = v;
 216 }
 217
 218 #ifdef __powerpc64__
 219 static inline unsigned long __raw_readq(const volatile void __iomem *addr)
 220 {
 221         return *(volatile unsigned long __force *)addr;
 222 }
 223 static inline void __raw_writeq(unsigned long v, volatile void __iomem *addr)
 224 {
 225         *(volatile unsigned long __force *)addr = v;
 226 }
 227 #endif /* __powerpc64__ */
 228
 229 /*
 230  *
 231  * PCI PIO and MMIO accessors.
 232  *
 233  */
 234
 235 /*
 236  * Include the EEH definitions when EEH is enabled only so they don't get
 237  * in the way when building for 32 bits
 238  */
 239 #ifdef CONFIG_EEH
 240 #include <asm/eeh.h>
 241 #endif
 242
 243 /* Shortcut to the MMIO argument pointer */
 244 #define PCI_IO_ADDR     volatile void __iomem *
 245
 246 /* Indirect IO address tokens:
 247  *
 248  * When CONFIG_PPC_INDIRECT_IO is set, the platform can provide hooks
 249  * on all IOs. (Note that this is all 64 bits only for now)
 250  *
 251  * To help platforms who may need to differenciate MMIO addresses in
 252  * their hooks, a bitfield is reserved for use by the platform near the
 253  * top of MMIO addresses (not PIO, those have to cope the hard way).
 254  *
 255  * This bit field is 12 bits and is at the top of the IO virtual
 256  * addresses PCI_IO_INDIRECT_TOKEN_MASK.
 257  *
 258  * The kernel virtual space is thus:
 259  *
 260  *  0xD000000000000000          : vmalloc
 261  *  0xD000080000000000          : PCI PHB IO space
 262  *  0xD000080080000000          : ioremap
 263  *  0xD0000fffffffffff          : end of ioremap region
 264  *
 265  * Since the top 4 bits are reserved as the region ID, we use thus
 266  * the next 12 bits and keep 4 bits available for the future if the
 267  * virtual address space is ever to be extended.
 268  *
 269  * The direct IO mapping operations will then mask off those bits
 270  * before doing the actual access, though that only happen when
 271  * CONFIG_PPC_INDIRECT_IO is set, thus be careful when you use that
 272  * mechanism
 273  */
 274
 275 #ifdef CONFIG_PPC_INDIRECT_IO
 276 #define PCI_IO_IND_TOKEN_MASK   0x0fff000000000000ul
 277 #define PCI_IO_IND_TOKEN_SHIFT  48
 278 #define PCI_FIX_ADDR(addr)                                              \
 279         ((PCI_IO_ADDR)(((unsigned long)(addr)) & ~PCI_IO_IND_TOKEN_MASK))
 280 #define PCI_GET_ADDR_TOKEN(addr)                                        \
 281         (((unsigned long)(addr) & PCI_IO_IND_TOKEN_MASK) >>             \
 282                 PCI_IO_IND_TOKEN_SHIFT)
 283 #define PCI_SET_ADDR_TOKEN(addr, token)                                 \
 284 do {                                                                    \
 285         unsigned long __a = (unsigned long)(addr);                      \
 286         __a &= ~PCI_IO_IND_TOKEN_MASK;                                  \
 287         __a |= ((unsigned long)(token)) << PCI_IO_IND_TOKEN_SHIFT;      \
 288         (addr) = (void __iomem *)__a;                                   \
 289 } while(0)
 290 #else
 291 #define PCI_FIX_ADDR(addr) (addr)
 292 #endif
 293
 294 /*
 295  * On 32 bits, PIO operations have a recovery mechanism in case they trigger
 296  * machine checks (which they occasionally do when probing non existing
 297  * IO ports on some platforms, like PowerMac and 8xx).
 298  * I always found it to be of dubious reliability and I am tempted to get
 299  * rid of it one of these days. So if you think it's important to keep it,
 300  * please voice up asap. We never had it for 64 bits and I do not intend
 301  * to port it over
 302  */
 303
 304 #ifdef CONFIG_PPC32
 305
 306 #define __do_in_asm(name, op)                           \
 307 extern __inline__ unsigned int name(unsigned int port)  \
 308 {                                                       \
 309         unsigned int x;                                 \
 310         __asm__ __volatile__(                           \
 311                 "sync\n"                                \
 312                 "0:"    op "    %0,0,%1\n"              \
 313                 "1:     twi     0,%0,0\n"               \
 314                 "2:     isync\n"                        \
 315                 "3:     nop\n"                          \
 316                 "4:\n"                                  \
 317                 ".section .fixup,\"ax\"\n"              \
 318                 "5:     li      %0,-1\n"                \
 319                 "       b       4b\n"                   \
 320                 ".previous\n"                           \
 321                 ".section __ex_table,\"a\"\n"           \
 322                 "       .align  2\n"                    \
 323                 "       .long   0b,5b\n"                \
 324                 "       .long   1b,5b\n"                \
 325                 "       .long   2b,5b\n"                \
 326                 "       .long   3b,5b\n"                \
 327                 ".previous"                             \
 328                 : "=&r" (x)                             \
 329                 : "r" (port + _IO_BASE));               \
 330         return x;                                       \
 331 }
 332
 333 #define __do_out_asm(name, op)                          \
 334 extern __inline__ void name(unsigned int val, unsigned int port) \
 335 {                                                       \
 336         __asm__ __volatile__(                           \
 337                 "sync\n"                                \
 338                 "0:" op " %0,0,%1\n"                    \
 339                 "1:     sync\n"                         \
 340                 "2:\n"                                  \
 341                 ".section __ex_table,\"a\"\n"           \
 342                 "       .align  2\n"                    \
 343                 "       .long   0b,2b\n"                \
 344                 "       .long   1b,2b\n"                \
 345                 ".previous"                             \
 346                 : : "r" (val), "r" (port + _IO_BASE));  \
 347 }
 348
 349 __do_in_asm(_rec_inb, "lbzx")
 350 __do_in_asm(_rec_inw, "lhbrx")
 351 __do_in_asm(_rec_inl, "lwbrx")
 352 __do_out_asm(_rec_outb, "stbx")
 353 __do_out_asm(_rec_outw, "sthbrx")
 354 __do_out_asm(_rec_outl, "stwbrx")
 355
 356 #endif /* CONFIG_PPC32 */
 357
 358 /* The "__do_*" operations below provide the actual "base" implementation
 359  * for each of the defined acccessor. Some of them use the out_* functions
 360  * directly, some of them still use EEH, though we might change that in the
 361  * future. Those macros below provide the necessary argument swapping and
 362  * handling of the IO base for PIO.
 363  *
 364  * They are themselves used by the macros that define the actual accessors
 365  * and can be used by the hooks if any.
 366  *
 367  * Note that PIO operations are always defined in terms of their corresonding
 368  * MMIO operations. That allows platforms like iSeries who want to modify the
 369  * behaviour of both to only hook on the MMIO version and get both. It's also
 370  * possible to hook directly at the toplevel PIO operation if they have to
 371  * be handled differently
 372  */
 373 #define __do_writeb(val, addr)  out_8(PCI_FIX_ADDR(addr), val)
 374 #define __do_writew(val, addr)  out_le16(PCI_FIX_ADDR(addr), val)
 375 #define __do_writel(val, addr)  out_le32(PCI_FIX_ADDR(addr), val)
 376 #define __do_writeq(val, addr)  out_le64(PCI_FIX_ADDR(addr), val)
 377 #define __do_writew_be(val, addr) out_be16(PCI_FIX_ADDR(addr), val)
 378 #define __do_writel_be(val, addr) out_be32(PCI_FIX_ADDR(addr), val)
 379 #define __do_writeq_be(val, addr) out_be64(PCI_FIX_ADDR(addr), val)
 380
 381 #ifdef CONFIG_EEH
 382 #define __do_readb(addr)        eeh_readb(PCI_FIX_ADDR(addr))
 383 #define __do_readw(addr)        eeh_readw(PCI_FIX_ADDR(addr))
 384 #define __do_readl(addr)        eeh_readl(PCI_FIX_ADDR(addr))
 385 #define __do_readq(addr)        eeh_readq(PCI_FIX_ADDR(addr))
 386 #define __do_readw_be(addr)     eeh_readw_be(PCI_FIX_ADDR(addr))
 387 #define __do_readl_be(addr)     eeh_readl_be(PCI_FIX_ADDR(addr))
 388 #define __do_readq_be(addr)     eeh_readq_be(PCI_FIX_ADDR(addr))
 389 #else /* CONFIG_EEH */
 390 #define __do_readb(addr)        in_8(PCI_FIX_ADDR(addr))
 391 #define __do_readw(addr)        in_le16(PCI_FIX_ADDR(addr))
 392 #define __do_readl(addr)        in_le32(PCI_FIX_ADDR(addr))
 393 #define __do_readq(addr)        in_le64(PCI_FIX_ADDR(addr))
 394 #define __do_readw_be(addr)     in_be16(PCI_FIX_ADDR(addr))
 395 #define __do_readl_be(addr)     in_be32(PCI_FIX_ADDR(addr))
 396 #define __do_readq_be(addr)     in_be64(PCI_FIX_ADDR(addr))
 397 #endif /* !defined(CONFIG_EEH) */
 398
 399 #ifdef CONFIG_PPC32
 400 #define __do_outb(val, port)    _rec_outb(val, port)
 401 #define __do_outw(val, port)    _rec_outw(val, port)
 402 #define __do_outl(val, port)    _rec_outl(val, port)
 403 #define __do_inb(port)          _rec_inb(port)
 404 #define __do_inw(port)          _rec_inw(port)
 405 #define __do_inl(port)          _rec_inl(port)
 406 #else /* CONFIG_PPC32 */
 407 #define __do_outb(val, port)    writeb(val,(PCI_IO_ADDR)_IO_BASE+port);
 408 #define __do_outw(val, port)    writew(val,(PCI_IO_ADDR)_IO_BASE+port);
 409 #define __do_outl(val, port)    writel(val,(PCI_IO_ADDR)_IO_BASE+port);
 410 #define __do_inb(port)          readb((PCI_IO_ADDR)_IO_BASE + port);
 411 #define __do_inw(port)          readw((PCI_IO_ADDR)_IO_BASE + port);
 412 #define __do_inl(port)          readl((PCI_IO_ADDR)_IO_BASE + port);
 413 #endif /* !CONFIG_PPC32 */
 414
 415 #ifdef CONFIG_EEH
 416 #define __do_readsb(a, b, n)    eeh_readsb(PCI_FIX_ADDR(a), (b), (n))
 417 #define __do_readsw(a, b, n)    eeh_readsw(PCI_FIX_ADDR(a), (b), (n))
 418 #define __do_readsl(a, b, n)    eeh_readsl(PCI_FIX_ADDR(a), (b), (n))
 419 #else /* CONFIG_EEH */
 420 #define __do_readsb(a, b, n)    _insb(PCI_FIX_ADDR(a), (b), (n))
 421 #define __do_readsw(a, b, n)    _insw(PCI_FIX_ADDR(a), (b), (n))
 422 #define __do_readsl(a, b, n)    _insl(PCI_FIX_ADDR(a), (b), (n))
 423 #endif /* !CONFIG_EEH */
 424 #define __do_writesb(a, b, n)   _outsb(PCI_FIX_ADDR(a),(b),(n))
 425 #define __do_writesw(a, b, n)   _outsw(PCI_FIX_ADDR(a),(b),(n))
 426 #define __do_writesl(a, b, n)   _outsl(PCI_FIX_ADDR(a),(b),(n))
 427
 428 #define __do_insb(p, b, n)      readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
 429 #define __do_insw(p, b, n)      readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
 430 #define __do_insl(p, b, n)      readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
 431 #define __do_outsb(p, b, n)     writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
 432 #define __do_outsw(p, b, n)     writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
 433 #define __do_outsl(p, b, n)     writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
 434
 435 #define __do_memset_io(addr, c, n)      \
 436                                 _memset_io(PCI_FIX_ADDR(addr), c, n)
 437 #define __do_memcpy_toio(dst, src, n)   \
 438                                 _memcpy_toio(PCI_FIX_ADDR(dst), src, n)
 439
 440 #ifdef CONFIG_EEH
 441 #define __do_memcpy_fromio(dst, src, n) \
 442                                 eeh_memcpy_fromio(dst, PCI_FIX_ADDR(src), n)
 443 #else /* CONFIG_EEH */
 444 #define __do_memcpy_fromio(dst, src, n) \
 445                                 _memcpy_fromio(dst,PCI_FIX_ADDR(src),n)
 446 #endif /* !CONFIG_EEH */
 447
 448 #ifdef CONFIG_PPC_INDIRECT_IO
 449 #define DEF_PCI_HOOK(x)         x
 450 #else
 451 #define DEF_PCI_HOOK(x)         NULL
 452 #endif
 453
 454 /* Structure containing all the hooks */
 455 extern struct ppc_pci_io {
 456
 457 #define DEF_PCI_AC_RET(name, ret, at, al)       ret (*name) at;
 458 #define DEF_PCI_AC_NORET(name, at, al)          void (*name) at;
 459
 460 #include <asm/io-defs.h>
 461
 462 #undef DEF_PCI_AC_RET
 463 #undef DEF_PCI_AC_NORET
 464
 465 } ppc_pci_io;
 466
 467 /* The inline wrappers */
 468 #define DEF_PCI_AC_RET(name, ret, at, al)                       \
 469 static inline ret name at                                       \
 470 {                                                               \
 471         if (DEF_PCI_HOOK(ppc_pci_io.name) != NULL)              \
 472                 return ppc_pci_io.name al;                      \
 473         return __do_##name al;                                  \
 474 }
 475
 476 #define DEF_PCI_AC_NORET(name, at, al)                          \
 477 static inline void name at                                      \
 478 {                                                               \
 479         if (DEF_PCI_HOOK(ppc_pci_io.name) != NULL)              \
 480                 ppc_pci_io.name al;                             \
 481         else                                                    \
 482                 __do_##name al;                                 \
 483 }
 484
 485 #include <asm/io-defs.h>
 486
 487 #undef DEF_PCI_AC_RET
 488 #undef DEF_PCI_AC_NORET
 489
 490 /* Some drivers check for the presence of readq & writeq with
 491  * a #ifdef, so we make them happy here.
 492  */
 493 #ifdef __powerpc64__
 494 #define readq   readq
 495 #define writeq  writeq
 496 #endif
 497
 498 #ifdef CONFIG_NOT_COHERENT_CACHE
 499
 500 #define dma_cache_inv(_start,_size) \
 501         invalidate_dcache_range(_start, (_start + _size))
 502 #define dma_cache_wback(_start,_size) \
 503         clean_dcache_range(_start, (_start + _size))
 504 #define dma_cache_wback_inv(_start,_size) \
 505         flush_dcache_range(_start, (_start + _size))
 506
 507 #else /* CONFIG_NOT_COHERENT_CACHE */
 508
 509 #define dma_cache_inv(_start,_size)             do { } while (0)
 510 #define dma_cache_wback(_start,_size)           do { } while (0)
 511 #define dma_cache_wback_inv(_start,_size)       do { } while (0)
 512
 513 #endif /* !CONFIG_NOT_COHERENT_CACHE */
 514
 515 /*
 516  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 517  * access
 518  */
 519 #define xlate_dev_mem_ptr(p)    __va(p)
 520
 521 /*
 522  * Convert a virtual cached pointer to an uncached pointer
 523  */
 524 #define xlate_dev_kmem_ptr(p)   p
 525
 526 /*
 527  * We don't do relaxed operations yet, at least not with this semantic
 528  */
 529 #define readb_relaxed(addr) readb(addr)
 530 #define readw_relaxed(addr) readw(addr)
 531 #define readl_relaxed(addr) readl(addr)
 532 #define readq_relaxed(addr) readq(addr)
 533
 534 #ifdef CONFIG_PPC32
 535 #define mmiowb()
 536 #else
 537 /*
 538  * Enforce synchronisation of stores vs. spin_unlock
 539  * (this does it explicitely, though our implementation of spin_unlock
 540  * does it implicitely too)
 541  */
 542 static inline void mmiowb(void)
 543 {
 544         unsigned long tmp;
 545
 546         __asm__ __volatile__("sync; li %0,0; stb %0,%1(13)"
 547         : "=&r" (tmp) : "i" (offsetof(struct paca_struct, io_sync))
 548         : "memory");
 549 }
 550 #endif /* !CONFIG_PPC32 */
 551
 552 static inline void iosync(void)
 553 {
 554         __asm__ __volatile__ ("sync" : : : "memory");
 555 }
 556
 557 /* Enforce in-order execution of data I/O.
 558  * No distinction between read/write on PPC; use eieio for all three.
 559  * Those are fairly week though. They don't provide a barrier between
 560  * MMIO and cacheable storage nor do they provide a barrier vs. locks,
 561  * they only provide barriers between 2 __raw MMIO operations and
 562  * possibly break write combining.
 563  */
 564 #define iobarrier_rw() eieio()
 565 #define iobarrier_r()  eieio()
 566 #define iobarrier_w()  eieio()
 567
 568
 569 /*
 570  * output pause versions need a delay at least for the
 571  * w83c105 ide controller in a p610.
 572  */
 573 #define inb_p(port)             inb(port)
 574 #define outb_p(val, port)       (udelay(1), outb((val), (port)))
 575 #define inw_p(port)             inw(port)
 576 #define outw_p(val, port)       (udelay(1), outw((val), (port)))
 577 #define inl_p(port)             inl(port)
 578 #define outl_p(val, port)       (udelay(1), outl((val), (port)))
 579
 580
 581 #define IO_SPACE_LIMIT ~(0UL)
 582
 583
 584 /**
 585  * ioremap     -   map bus memory into CPU space
 586  * @address:   bus address of the memory
 587  * @size:      size of the resource to map
 588  *
 589  * ioremap performs a platform specific sequence of operations to
 590  * make bus memory CPU accessible via the readb/readw/readl/writeb/
 591  * writew/writel functions and the other mmio helpers. The returned
 592  * address is not guaranteed to be usable directly as a virtual
 593  * address.
 594  *
 595  * We provide a few variations of it:
 596  *
 597  * * ioremap is the standard one and provides non-cacheable guarded mappings
 598  *   and can be hooked by the platform via ppc_md
 599  *
 600  * * ioremap_flags allows to specify the page flags as an argument and can
 601  *   also be hooked by the platform via ppc_md
 602  *
 603  * * ioremap_nocache is identical to ioremap
 604  *
 605  * * iounmap undoes such a mapping and can be hooked
 606  *
 607  * * __ioremap_explicit (and the pending __iounmap_explicit) are low level
 608  *   functions to create hand-made mappings for use only by the PCI code
 609  *   and cannot currently be hooked.
 610  *
 611  * * __ioremap is the low level implementation used by ioremap and
 612  *   ioremap_flags and cannot be hooked (but can be used by a hook on one
 613  *   of the previous ones)
 614  *
 615  * * __iounmap, is the low level implementation used by iounmap and cannot
 616  *   be hooked (but can be used by a hook on iounmap)
 617  *
 618  */
 619 extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
 620 extern void __iomem *ioremap_flags(phys_addr_t address, unsigned long size,
 621                                    unsigned long flags);
 622 #define ioremap_nocache(addr, size)     ioremap((addr), (size))
 623 extern void iounmap(volatile void __iomem *addr);
 624
 625 extern void __iomem *__ioremap(phys_addr_t, unsigned long size,
 626                                unsigned long flags);
 627 extern void __iounmap(volatile void __iomem *addr);
 628
 629 extern int __ioremap_explicit(phys_addr_t p_addr, unsigned long v_addr,
 630                               unsigned long size, unsigned long flags);
 631 extern int __iounmap_explicit(volatile void __iomem *start,
 632                               unsigned long size);
 633
 634 extern void __iomem * reserve_phb_iospace(unsigned long size);
 635
 636 /* Those are more 32 bits only functions */
 637 extern unsigned long iopa(unsigned long addr);
 638 extern unsigned long mm_ptov(unsigned long addr) __attribute_const__;
 639 extern void io_block_mapping(unsigned long virt, phys_addr_t phys,
 640                              unsigned int size, int flags);
 641
 642
 643 /*
 644  * When CONFIG_PPC_INDIRECT_IO is set, we use the generic iomap implementation
 645  * which needs some additional definitions here. They basically allow PIO
 646  * space overall to be 1GB. This will work as long as we never try to use
 647  * iomap to map MMIO below 1GB which should be fine on ppc64
 648  */
 649 #define HAVE_ARCH_PIO_SIZE              1
 650 #define PIO_OFFSET                      0x00000000UL
 651 #define PIO_MASK                        0x3fffffffUL
 652 #define PIO_RESERVED                    0x40000000UL
 653
 654 #define mmio_read16be(addr)             readw_be(addr)
 655 #define mmio_read32be(addr)             readl_be(addr)
 656 #define mmio_write16be(val, addr)       writew_be(val, addr)
 657 #define mmio_write32be(val, addr)       writel_be(val, addr)
 658 #define mmio_insb(addr, dst, count)     readsb(addr, dst, count)
 659 #define mmio_insw(addr, dst, count)     readsw(addr, dst, count)
 660 #define mmio_insl(addr, dst, count)     readsl(addr, dst, count)
 661 #define mmio_outsb(addr, src, count)    writesb(addr, src, count)
 662 #define mmio_outsw(addr, src, count)    writesw(addr, src, count)
 663 #define mmio_outsl(addr, src, count)    writesl(addr, src, count)
 664
 665 /**
 666  *      virt_to_phys    -       map virtual addresses to physical
 667  *      @address: address to remap
 668  *
 669  *      The returned physical address is the physical (CPU) mapping for
 670  *      the memory address given. It is only valid to use this function on
 671  *      addresses directly mapped or allocated via kmalloc.
 672  *
 673  *      This function does not give bus mappings for DMA transfers. In
 674  *      almost all conceivable cases a device driver should not be using
 675  *      this function
 676  */
 677 static inline unsigned long virt_to_phys(volatile void * address)
 678 {
 679         return __pa((unsigned long)address);
 680 }
 681
 682 /**
 683  *      phys_to_virt    -       map physical address to virtual
 684  *      @address: address to remap
 685  *
 686  *      The returned virtual address is a current CPU mapping for
 687  *      the memory address given. It is only valid to use this function on
 688  *      addresses that have a kernel mapping
 689  *
 690  *      This function does not handle bus mappings for DMA transfers. In
 691  *      almost all conceivable cases a device driver should not be using
 692  *      this function
 693  */
 694 static inline void * phys_to_virt(unsigned long address)
 695 {
 696         return (void *)__va(address);
 697 }
 698
 699 /*
 700  * Change "struct page" to physical address.
 701  */
 702 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 703
 704 /* We do NOT want virtual merging, it would put too much pressure on
 705  * our iommu allocator. Instead, we want drivers to be smart enough
 706  * to coalesce sglists that happen to have been mapped in a contiguous
 707  * way by the iommu
 708  */
 709 #define BIO_VMERGE_BOUNDARY     0
 710
 711 /*
 712  * 32 bits still uses virt_to_bus() for it's implementation of DMA
 713  * mappings se we have to keep it defined here. We also have some old
 714  * drivers (shame shame shame) that use bus_to_virt() and haven't been
 715  * fixed yet so I need to define it here.
 716  */
 717 #ifdef CONFIG_PPC32
 718
 719 static inline unsigned long virt_to_bus(volatile void * address)
 720 {
 721         if (address == NULL)
 722                 return 0;
 723         return __pa(address) + PCI_DRAM_OFFSET;
 724 }
 725
 726 static inline void * bus_to_virt(unsigned long address)
 727 {
 728         if (address == 0)
 729                 return NULL;
 730         return __va(address - PCI_DRAM_OFFSET);
 731 }
 732
 733 #define page_to_bus(page)       (page_to_phys(page) + PCI_DRAM_OFFSET)
 734
 735 #endif /* CONFIG_PPC32 */
 736
 737
 738 #endif /* __KERNEL__ */
 739
 740 #endif /* _ASM_POWERPC_IO_H */