include/asm-ppc/io.h

   1 #ifdef __KERNEL__
   2 #ifndef _PPC_IO_H
   3 #define _PPC_IO_H
   4
   5 #include <linux/string.h>
   6 #include <linux/types.h>
   7
   8 #include <asm/page.h>
   9 #include <asm/byteorder.h>
  10 #include <asm/synch.h>
  11 #include <asm/mmu.h>
  12
  13 #define SIO_CONFIG_RA   0x398
  14 #define SIO_CONFIG_RD   0x399
  15
  16 #define SLOW_DOWN_IO
  17
  18 #define PMAC_ISA_MEM_BASE       0
  19 #define PMAC_PCI_DRAM_OFFSET    0
  20 #define CHRP_ISA_IO_BASE        0xf8000000
  21 #define CHRP_ISA_MEM_BASE       0xf7000000
  22 #define CHRP_PCI_DRAM_OFFSET    0
  23 #define PREP_ISA_IO_BASE        0x80000000
  24 #define PREP_ISA_MEM_BASE       0xc0000000
  25 #define PREP_PCI_DRAM_OFFSET    0x80000000
  26
  27 #if defined(CONFIG_4xx)
  28 #include <asm/ibm4xx.h>
  29 #elif defined(CONFIG_8xx)
  30 #include <asm/mpc8xx.h>
  31 #elif defined(CONFIG_8260)
  32 #include <asm/mpc8260.h>
  33 #elif !defined(CONFIG_PCI)
  34 #define _IO_BASE        0
  35 #define _ISA_MEM_BASE   0
  36 #define PCI_DRAM_OFFSET 0
  37 #else /* Everyone else */
  38 #define _IO_BASE        isa_io_base
  39 #define _ISA_MEM_BASE   isa_mem_base
  40 #define PCI_DRAM_OFFSET pci_dram_offset
  41 #endif /* Platform-dependent I/O */
  42
  43 #define ___IO_BASE ((void __iomem *)_IO_BASE)
  44 extern unsigned long isa_io_base;
  45 extern unsigned long isa_mem_base;
  46 extern unsigned long pci_dram_offset;
  47
  48 /*
  49  * 8, 16 and 32 bit, big and little endian I/O operations, with barrier.
  50  *
  51  * Read operations have additional twi & isync to make sure the read
  52  * is actually performed (i.e. the data has come back) before we start
  53  * executing any following instructions.
  54  */
  55 extern inline int in_8(const volatile unsigned char __iomem *addr)
  56 {
  57         int ret;
  58
  59         __asm__ __volatile__(
  60                 "sync; lbz%U1%X1 %0,%1;\n"
  61                 "twi 0,%0,0;\n"
  62                 "isync" : "=r" (ret) : "m" (*addr));
  63         return ret;
  64 }
  65
  66 extern inline void out_8(volatile unsigned char __iomem *addr, int val)
  67 {
  68         __asm__ __volatile__("stb%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
  69 }
  70
  71 extern inline int in_le16(const volatile unsigned short __iomem *addr)
  72 {
  73         int ret;
  74
  75         __asm__ __volatile__("sync; lhbrx %0,0,%1;\n"
  76                              "twi 0,%0,0;\n"
  77                              "isync" : "=r" (ret) :
  78                               "r" (addr), "m" (*addr));
  79         return ret;
  80 }
  81
  82 extern inline int in_be16(const volatile unsigned short __iomem *addr)
  83 {
  84         int ret;
  85
  86         __asm__ __volatile__("sync; lhz%U1%X1 %0,%1;\n"
  87                              "twi 0,%0,0;\n"
  88                              "isync" : "=r" (ret) : "m" (*addr));
  89         return ret;
  90 }
  91
  92 extern inline void out_le16(volatile unsigned short __iomem *addr, int val)
  93 {
  94         __asm__ __volatile__("sync; sthbrx %1,0,%2" : "=m" (*addr) :
  95                               "r" (val), "r" (addr));
  96 }
  97
  98 extern inline void out_be16(volatile unsigned short __iomem *addr, int val)
  99 {
 100         __asm__ __volatile__("sync; sth%U0%X0 %1,%0" : "=m" (*addr) : "r" (val));
 101 }
 102
 103 extern inline unsigned in_le32(const volatile unsigned __iomem *addr)
 104 {
 105         unsigned ret;
 106
 107         __asm__ __volatile__("sync; lwbrx %0,0,%1;\n"
 108                              "twi 0,%0,0;\n"
 109                              "isync" : "=r" (ret) :
 110                              "r" (addr), "m" (*addr));
 111         return ret;
 112 }
 113
 114 extern inline unsigned in_be32(const volatile unsigned __iomem *addr)
 115 {
 116         unsigned ret;
 117
 118         __asm__ __volatile__("sync; lwz%U1%X1 %0,%1;\n"
 119                              "twi 0,%0,0;\n"
 120                              "isync" : "=r" (ret) : "m" (*addr));
 121         return ret;
 122 }
 123
 124 extern inline void out_le32(volatile unsigned __iomem *addr, int val)
 125 {
 126         __asm__ __volatile__("sync; stwbrx %1,0,%2" : "=m" (*addr) :
 127                              "r" (val), "r" (addr));
 128 }
 129
 130 extern inline void out_be32(volatile unsigned __iomem *addr, int val)
 131 {
 132         __asm__ __volatile__("sync; stw%U0%X0 %1,%0" : "=m" (*addr) : "r" (val));
 133 }
 134 #if defined (CONFIG_8260_PCI9)
 135 #define readb(addr) in_8((volatile u8 *)(addr))
 136 #define writeb(b,addr) out_8((volatile u8 *)(addr), (b))
 137 #else
 138 static inline __u8 readb(const volatile void __iomem *addr)
 139 {
 140         return in_8(addr);
 141 }
 142 static inline void writeb(__u8 b, volatile void __iomem *addr)
 143 {
 144         out_8(addr, b);
 145 }
 146 #endif
 147
 148 #if defined (CONFIG_8260_PCI9)
 149 /* Use macros if PCI9 workaround enabled */
 150 #define readw(addr) in_le16((volatile u16 *)(addr))
 151 #define readl(addr) in_le32((volatile u32 *)(addr))
 152 #define writew(b,addr) out_le16((volatile u16 *)(addr),(b))
 153 #define writel(b,addr) out_le32((volatile u32 *)(addr),(b))
 154 #else
 155 static inline __u16 readw(const volatile void __iomem *addr)
 156 {
 157         return in_le16(addr);
 158 }
 159 static inline __u32 readl(const volatile void __iomem *addr)
 160 {
 161         return in_le32(addr);
 162 }
 163 static inline void writew(__u16 b, volatile void __iomem *addr)
 164 {
 165         out_le16(addr, b);
 166 }
 167 static inline void writel(__u32 b, volatile void __iomem *addr)
 168 {
 169         out_le32(addr, b);
 170 }
 171 #endif /* CONFIG_8260_PCI9 */
 172
 173 #define readb_relaxed(addr) readb(addr)
 174 #define readw_relaxed(addr) readw(addr)
 175 #define readl_relaxed(addr) readl(addr)
 176
 177 static inline __u8 __raw_readb(const volatile void __iomem *addr)
 178 {
 179         return *(__force volatile __u8 *)(addr);
 180 }
 181 static inline __u16 __raw_readw(const volatile void __iomem *addr)
 182 {
 183         return *(__force volatile __u16 *)(addr);
 184 }
 185 static inline __u32 __raw_readl(const volatile void __iomem *addr)
 186 {
 187         return *(__force volatile __u32 *)(addr);
 188 }
 189 static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
 190 {
 191         *(__force volatile __u8 *)(addr) = b;
 192 }
 193 static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
 194 {
 195         *(__force volatile __u16 *)(addr) = b;
 196 }
 197 static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
 198 {
 199         *(__force volatile __u32 *)(addr) = b;
 200 }
 201
 202 #define mmiowb()
 203
 204 /*
 205  * The insw/outsw/insl/outsl macros don't do byte-swapping.
 206  * They are only used in practice for transferring buffers which
 207  * are arrays of bytes, and byte-swapping is not appropriate in
 208  * that case.  - paulus
 209  */
 210 #define insb(port, buf, ns)     _insb((port)+___IO_BASE, (buf), (ns))
 211 #define outsb(port, buf, ns)    _outsb((port)+___IO_BASE, (buf), (ns))
 212 #define insw(port, buf, ns)     _insw_ns((port)+___IO_BASE, (buf), (ns))
 213 #define outsw(port, buf, ns)    _outsw_ns((port)+___IO_BASE, (buf), (ns))
 214 #define insl(port, buf, nl)     _insl_ns((port)+___IO_BASE, (buf), (nl))
 215 #define outsl(port, buf, nl)    _outsl_ns((port)+___IO_BASE, (buf), (nl))
 216
 217 #define readsb(a, b, n)         _insb((a), (b), (n))
 218 #define readsw(a, b, n)         _insw_ns((a), (b), (n))
 219 #define readsl(a, b, n)         _insl_ns((a), (b), (n))
 220 #define writesb(a, b, n)        _outsb((a),(b),(n))
 221 #define writesw(a, b, n)        _outsw_ns((a),(b),(n))
 222 #define writesl(a, b, n)        _outsl_ns((a),(b),(n))
 223
 224
 225 /*
 226  * On powermacs and 8xx we will get a machine check exception
 227  * if we try to read data from a non-existent I/O port. Because
 228  * the machine check is an asynchronous exception, it isn't
 229  * well-defined which instruction SRR0 will point to when the
 230  * exception occurs.
 231  * With the sequence below (twi; isync; nop), we have found that
 232  * the machine check occurs on one of the three instructions on
 233  * all PPC implementations tested so far.  The twi and isync are
 234  * needed on the 601 (in fact twi; sync works too), the isync and
 235  * nop are needed on 604[e|r], and any of twi, sync or isync will
 236  * work on 603[e], 750, 74xx.
 237  * The twi creates an explicit data dependency on the returned
 238  * value which seems to be needed to make the 601 wait for the
 239  * load to finish.
 240  */
 241
 242 #define __do_in_asm(name, op)                           \
 243 extern __inline__ unsigned int name(unsigned int port)  \
 244 {                                                       \
 245         unsigned int x;                                 \
 246         __asm__ __volatile__(                           \
 247                 "sync\n"                                \
 248                 "0:"    op "    %0,0,%1\n"              \
 249                 "1:     twi     0,%0,0\n"               \
 250                 "2:     isync\n"                        \
 251                 "3:     nop\n"                          \
 252                 "4:\n"                                  \
 253                 ".section .fixup,\"ax\"\n"              \
 254                 "5:     li      %0,-1\n"                \
 255                 "       b       4b\n"                   \
 256                 ".previous\n"                           \
 257                 ".section __ex_table,\"a\"\n"           \
 258                 "       .align  2\n"                    \
 259                 "       .long   0b,5b\n"                \
 260                 "       .long   1b,5b\n"                \
 261                 "       .long   2b,5b\n"                \
 262                 "       .long   3b,5b\n"                \
 263                 ".previous"                             \
 264                 : "=&r" (x)                             \
 265                 : "r" (port + ___IO_BASE));             \
 266         return x;                                       \
 267 }
 268
 269 #define __do_out_asm(name, op)                          \
 270 extern __inline__ void name(unsigned int val, unsigned int port) \
 271 {                                                       \
 272         __asm__ __volatile__(                           \
 273                 "sync\n"                                \
 274                 "0:" op " %0,0,%1\n"                    \
 275                 "1:     sync\n"                         \
 276                 "2:\n"                                  \
 277                 ".section __ex_table,\"a\"\n"           \
 278                 "       .align  2\n"                    \
 279                 "       .long   0b,2b\n"                \
 280                 "       .long   1b,2b\n"                \
 281                 ".previous"                             \
 282                 : : "r" (val), "r" (port + ___IO_BASE));        \
 283 }
 284
 285 __do_out_asm(outb, "stbx")
 286 #if defined (CONFIG_8260_PCI9)
 287 /* in asm cannot be defined if PCI9 workaround is used */
 288 #define inb(port)               in_8((port)+___IO_BASE)
 289 #define inw(port)               in_le16((port)+___IO_BASE)
 290 #define inl(port)               in_le32((port)+___IO_BASE)
 291 __do_out_asm(outw, "sthbrx")
 292 __do_out_asm(outl, "stwbrx")
 293 #else
 294 __do_in_asm(inb, "lbzx")
 295 __do_in_asm(inw, "lhbrx")
 296 __do_in_asm(inl, "lwbrx")
 297 __do_out_asm(outw, "sthbrx")
 298 __do_out_asm(outl, "stwbrx")
 299
 300 #endif
 301
 302 #define inb_p(port)             inb((port))
 303 #define outb_p(val, port)       outb((val), (port))
 304 #define inw_p(port)             inw((port))
 305 #define outw_p(val, port)       outw((val), (port))
 306 #define inl_p(port)             inl((port))
 307 #define outl_p(val, port)       outl((val), (port))
 308
 309 extern void _insb(const volatile u8 __iomem *addr, void *buf, long count);
 310 extern void _outsb(volatile u8 __iomem *addr,const void *buf,long count);
 311 extern void _insw_ns(const volatile u16 __iomem *addr, void *buf, long count);
 312 extern void _outsw_ns(volatile u16 __iomem *addr, const void *buf, long count);
 313 extern void _insl_ns(const volatile u32 __iomem *addr, void *buf, long count);
 314 extern void _outsl_ns(volatile u32 __iomem *addr, const void *buf, long count);
 315
 316
 317 #define IO_SPACE_LIMIT ~0
 318
 319 #if defined (CONFIG_8260_PCI9)
 320 #define memset_io(a,b,c)       memset((void *)(a),(b),(c))
 321 #define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
 322 #define memcpy_toio(a,b,c)     memcpy((void *)(a),(b),(c))
 323 #else
 324 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
 325 {
 326         memset((void __force *)addr, val, count);
 327 }
 328 static inline void memcpy_fromio(void *dst,const volatile void __iomem *src, int count)
 329 {
 330         memcpy(dst, (void __force *) src, count);
 331 }
 332 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
 333 {
 334         memcpy((void __force *) dst, src, count);
 335 }
 336 #endif
 337
 338 /*
 339  * Map in an area of physical address space, for accessing
 340  * I/O devices etc.
 341  */
 342 extern void __iomem *__ioremap(phys_addr_t address, unsigned long size,
 343                        unsigned long flags);
 344 extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
 345 #ifdef CONFIG_44x
 346 extern void __iomem *ioremap64(unsigned long long address, unsigned long size);
 347 #endif
 348 #define ioremap_nocache(addr, size)     ioremap((addr), (size))
 349 extern void iounmap(volatile void __iomem *addr);
 350 extern unsigned long iopa(unsigned long addr);
 351 extern void io_block_mapping(unsigned long virt, phys_addr_t phys,
 352                              unsigned int size, int flags);
 353
 354 /*
 355  * The PCI bus is inherently Little-Endian.  The PowerPC is being
 356  * run Big-Endian.  Thus all values which cross the [PCI] barrier
 357  * must be endian-adjusted.  Also, the local DRAM has a different
 358  * address from the PCI point of view, thus buffer addresses also
 359  * have to be modified [mapped] appropriately.
 360  */
 361 extern inline unsigned long virt_to_bus(volatile void * address)
 362 {
 363         if (address == (void *)0)
 364                 return 0;
 365         return (unsigned long)address - KERNELBASE + PCI_DRAM_OFFSET;
 366 }
 367
 368 extern inline void * bus_to_virt(unsigned long address)
 369 {
 370         if (address == 0)
 371                 return NULL;
 372         return (void *)(address - PCI_DRAM_OFFSET + KERNELBASE);
 373 }
 374
 375 /*
 376  * Change virtual addresses to physical addresses and vv, for
 377  * addresses in the area where the kernel has the RAM mapped.
 378  */
 379 extern inline unsigned long virt_to_phys(volatile void * address)
 380 {
 381         return (unsigned long) address - KERNELBASE;
 382 }
 383
 384 extern inline void * phys_to_virt(unsigned long address)
 385 {
 386         return (void *) (address + KERNELBASE);
 387 }
 388
 389 /*
 390  * Change "struct page" to physical address.
 391  */
 392 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 393 #define page_to_bus(page)       (page_to_phys(page) + PCI_DRAM_OFFSET)
 394
 395 /* Enforce in-order execution of data I/O.
 396  * No distinction between read/write on PPC; use eieio for all three.
 397  */
 398 #define iobarrier_rw() eieio()
 399 #define iobarrier_r()  eieio()
 400 #define iobarrier_w()  eieio()
 401
 402 /*
 403  * Here comes the ppc implementation of the IOMAP
 404  * interfaces.
 405  */
 406 static inline unsigned int ioread8(void __iomem *addr)
 407 {
 408         return readb(addr);
 409 }
 410
 411 static inline unsigned int ioread16(void __iomem *addr)
 412 {
 413         return readw(addr);
 414 }
 415
 416 static inline unsigned int ioread32(void __iomem *addr)
 417 {
 418         return readl(addr);
 419 }
 420
 421 static inline void iowrite8(u8 val, void __iomem *addr)
 422 {
 423         writeb(val, addr);
 424 }
 425
 426 static inline void iowrite16(u16 val, void __iomem *addr)
 427 {
 428         writew(val, addr);
 429 }
 430
 431 static inline void iowrite32(u32 val, void __iomem *addr)
 432 {
 433         writel(val, addr);
 434 }
 435
 436 static inline void ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
 437 {
 438         _insb(addr, dst, count);
 439 }
 440
 441 static inline void ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
 442 {
 443         _insw_ns(addr, dst, count);
 444 }
 445
 446 static inline void ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
 447 {
 448         _insl_ns(addr, dst, count);
 449 }
 450
 451 static inline void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
 452 {
 453         _outsb(addr, src, count);
 454 }
 455
 456 static inline void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
 457 {
 458         _outsw_ns(addr, src, count);
 459 }
 460
 461 static inline void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
 462 {
 463         _outsl_ns(addr, src, count);
 464 }
 465
 466 /* Create a virtual mapping cookie for an IO port range */
 467 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
 468 extern void ioport_unmap(void __iomem *);
 469
 470 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
 471 struct pci_dev;
 472 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
 473 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
 474
 475 #endif /* _PPC_IO_H */
 476
 477 #ifdef CONFIG_8260_PCI9
 478 #include <asm/mpc8260_pci9.h>
 479 #endif
 480
 481 /*
 482  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 483  * access
 484  */
 485 #define xlate_dev_mem_ptr(p)    __va(p)
 486
 487 /*
 488  * Convert a virtual cached pointer to an uncached pointer
 489  */
 490 #define xlate_dev_kmem_ptr(p)   p
 491
 492 /* access ports */
 493 #define setbits32(_addr, _v) out_be32((_addr), in_be32(_addr) |  (_v))
 494 #define clrbits32(_addr, _v) out_be32((_addr), in_be32(_addr) & ~(_v))
 495
 496 #define setbits16(_addr, _v) out_be16((_addr), in_be16(_addr) |  (_v))
 497 #define clrbits16(_addr, _v) out_be16((_addr), in_be16(_addr) & ~(_v))
 498
 499 #define setbits8(_addr, _v) out_8((_addr), in_8(_addr) |  (_v))
 500 #define clrbits8(_addr, _v) out_8((_addr), in_8(_addr) & ~(_v))
 501
 502 #endif /* __KERNEL__ */