include/asm-arm/arch-ixp4xx/io.h

   1 /*
   2  * linux/include/asm-arm/arch-ixp4xx/io.h
   3  *
   4  * Author: Deepak Saxena <dsaxena@plexity.net>
   5  *
   6  * Copyright (C) 2002-2005  MontaVista Software, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #ifndef __ASM_ARM_ARCH_IO_H
  14 #define __ASM_ARM_ARCH_IO_H
  15
  16 #include <asm/hardware.h>
  17
  18 #define IO_SPACE_LIMIT 0xffff0000
  19
  20 extern int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
  21 extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data);
  22
  23
  24 /*
  25  * IXP4xx provides two methods of accessing PCI memory space:
  26  *
  27  * 1) A direct mapped window from 0x48000000 to 0x4bffffff (64MB).
  28  *    To access PCI via this space, we simply ioremap() the BAR
  29  *    into the kernel and we can use the standard read[bwl]/write[bwl]
  30  *    macros. This is the preffered method due to speed but it
  31  *    limits the system to just 64MB of PCI memory. This can be
  32  *    problamatic if using video cards and other memory-heavy
  33  *    targets.
  34  *
  35  * 2) If > 64MB of memory space is required, the IXP4xx can be configured
  36  *    to use indirect registers to access PCI (as we do below for I/O
  37  *    transactions). This allows for up to 128MB (0x48000000 to 0x4fffffff)
  38  *    of memory on the bus. The disadvantage of this is that every
  39  *    PCI access requires three local register accesses plus a spinlock,
  40  *    but in some cases the performance hit is acceptable. In addition,
  41  *    you cannot mmap() PCI devices in this case.
  42  *
  43  */
  44 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
  45
  46 #define __mem_pci(a)            (a)
  47
  48 #else
  49
  50 #include <linux/mm.h>
  51
  52 /*
  53  * In the case of using indirect PCI, we simply return the actual PCI
  54  * address and our read/write implementation use that to drive the
  55  * access registers. If something outside of PCI is ioremap'd, we
  56  * fallback to the default.
  57  */
  58 static inline void __iomem *
  59 __ixp4xx_ioremap(unsigned long addr, size_t size, unsigned int mtype)
  60 {
  61         if((addr < PCIBIOS_MIN_MEM) || (addr > 0x4fffffff))
  62                 return __arm_ioremap(addr, size, mtype);
  63
  64         return (void *)addr;
  65 }
  66
  67 static inline void
  68 __ixp4xx_iounmap(void __iomem *addr)
  69 {
  70         if ((u32)addr >= VMALLOC_START)
  71                 __iounmap(addr);
  72 }
  73
  74 #define __arch_ioremap(a, s, f)         __ixp4xx_ioremap(a, s, f)
  75 #define __arch_iounmap(a)               __ixp4xx_iounmap(a)
  76
  77 #define writeb(v, p)                    __ixp4xx_writeb(v, p)
  78 #define writew(v, p)                    __ixp4xx_writew(v, p)
  79 #define writel(v, p)                    __ixp4xx_writel(v, p)
  80
  81 #define writesb(p, v, l)                __ixp4xx_writesb(p, v, l)
  82 #define writesw(p, v, l)                __ixp4xx_writesw(p, v, l)
  83 #define writesl(p, v, l)                __ixp4xx_writesl(p, v, l)
  84
  85 #define readb(p)                        __ixp4xx_readb(p)
  86 #define readw(p)                        __ixp4xx_readw(p)
  87 #define readl(p)                        __ixp4xx_readl(p)
  88
  89 #define readsb(p, v, l)                 __ixp4xx_readsb(p, v, l)
  90 #define readsw(p, v, l)                 __ixp4xx_readsw(p, v, l)
  91 #define readsl(p, v, l)                 __ixp4xx_readsl(p, v, l)
  92
  93 static inline void
  94 __ixp4xx_writeb(u8 value, volatile void __iomem *p)
  95 {
  96         u32 addr = (u32)p;
  97         u32 n, byte_enables, data;
  98
  99         if (addr >= VMALLOC_START) {
 100                 __raw_writeb(value, addr);
 101                 return;
 102         }
 103
 104         n = addr % 4;
 105         byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
 106         data = value << (8*n);
 107         ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
 108 }
 109
 110 static inline void
 111 __ixp4xx_writesb(volatile void __iomem *bus_addr, const u8 *vaddr, int count)
 112 {
 113         while (count--)
 114                 writeb(*vaddr++, bus_addr);
 115 }
 116
 117 static inline void
 118 __ixp4xx_writew(u16 value, volatile void __iomem *p)
 119 {
 120         u32 addr = (u32)p;
 121         u32 n, byte_enables, data;
 122
 123         if (addr >= VMALLOC_START) {
 124                 __raw_writew(value, addr);
 125                 return;
 126         }
 127
 128         n = addr % 4;
 129         byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
 130         data = value << (8*n);
 131         ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
 132 }
 133
 134 static inline void
 135 __ixp4xx_writesw(volatile void __iomem *bus_addr, const u16 *vaddr, int count)
 136 {
 137         while (count--)
 138                 writew(*vaddr++, bus_addr);
 139 }
 140
 141 static inline void
 142 __ixp4xx_writel(u32 value, volatile void __iomem *p)
 143 {
 144         u32 addr = (u32)p;
 145         if (addr >= VMALLOC_START) {
 146                 __raw_writel(value, addr);
 147                 return;
 148         }
 149
 150         ixp4xx_pci_write(addr, NP_CMD_MEMWRITE, value);
 151 }
 152
 153 static inline void
 154 __ixp4xx_writesl(volatile void __iomem *bus_addr, const u32 *vaddr, int count)
 155 {
 156         while (count--)
 157                 writel(*vaddr++, bus_addr);
 158 }
 159
 160 static inline unsigned char
 161 __ixp4xx_readb(const volatile void __iomem *p)
 162 {
 163         u32 addr = (u32)p;
 164         u32 n, byte_enables, data;
 165
 166         if (addr >= VMALLOC_START)
 167                 return __raw_readb(addr);
 168
 169         n = addr % 4;
 170         byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
 171         if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
 172                 return 0xff;
 173
 174         return data >> (8*n);
 175 }
 176
 177 static inline void
 178 __ixp4xx_readsb(const volatile void __iomem *bus_addr, u8 *vaddr, u32 count)
 179 {
 180         while (count--)
 181                 *vaddr++ = readb(bus_addr);
 182 }
 183
 184 static inline unsigned short
 185 __ixp4xx_readw(const volatile void __iomem *p)
 186 {
 187         u32 addr = (u32)p;
 188         u32 n, byte_enables, data;
 189
 190         if (addr >= VMALLOC_START)
 191                 return __raw_readw(addr);
 192
 193         n = addr % 4;
 194         byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
 195         if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
 196                 return 0xffff;
 197
 198         return data>>(8*n);
 199 }
 200
 201 static inline void
 202 __ixp4xx_readsw(const volatile void __iomem *bus_addr, u16 *vaddr, u32 count)
 203 {
 204         while (count--)
 205                 *vaddr++ = readw(bus_addr);
 206 }
 207
 208 static inline unsigned long
 209 __ixp4xx_readl(const volatile void __iomem *p)
 210 {
 211         u32 addr = (u32)p;
 212         u32 data;
 213
 214         if (addr >= VMALLOC_START)
 215                 return __raw_readl(addr);
 216
 217         if (ixp4xx_pci_read(addr, NP_CMD_MEMREAD, &data))
 218                 return 0xffffffff;
 219
 220         return data;
 221 }
 222
 223 static inline void
 224 __ixp4xx_readsl(const volatile void __iomem *bus_addr, u32 *vaddr, u32 count)
 225 {
 226         while (count--)
 227                 *vaddr++ = readl(bus_addr);
 228 }
 229
 230
 231 /*
 232  * We can use the built-in functions b/c they end up calling writeb/readb
 233  */
 234 #define memset_io(c,v,l)                _memset_io((c),(v),(l))
 235 #define memcpy_fromio(a,c,l)            _memcpy_fromio((a),(c),(l))
 236 #define memcpy_toio(c,a,l)              _memcpy_toio((c),(a),(l))
 237
 238 #endif
 239
 240 #ifndef CONFIG_PCI
 241
 242 #define __io(v)         v
 243
 244 #else
 245
 246 /*
 247  * IXP4xx does not have a transparent cpu -> PCI I/O translation
 248  * window.  Instead, it has a set of registers that must be tweaked
 249  * with the proper byte lanes, command types, and address for the
 250  * transaction.  This means that we need to override the default
 251  * I/O functions.
 252  */
 253 #define outb(p, v)                      __ixp4xx_outb(p, v)
 254 #define outw(p, v)                      __ixp4xx_outw(p, v)
 255 #define outl(p, v)                      __ixp4xx_outl(p, v)
 256
 257 #define outsb(p, v, l)                  __ixp4xx_outsb(p, v, l)
 258 #define outsw(p, v, l)                  __ixp4xx_outsw(p, v, l)
 259 #define outsl(p, v, l)                  __ixp4xx_outsl(p, v, l)
 260
 261 #define inb(p)                          __ixp4xx_inb(p)
 262 #define inw(p)                          __ixp4xx_inw(p)
 263 #define inl(p)                          __ixp4xx_inl(p)
 264
 265 #define insb(p, v, l)                   __ixp4xx_insb(p, v, l)
 266 #define insw(p, v, l)                   __ixp4xx_insw(p, v, l)
 267 #define insl(p, v, l)                   __ixp4xx_insl(p, v, l)
 268
 269
 270 static inline void
 271 __ixp4xx_outb(u8 value, u32 addr)
 272 {
 273         u32 n, byte_enables, data;
 274         n = addr % 4;
 275         byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
 276         data = value << (8*n);
 277         ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
 278 }
 279
 280 static inline void
 281 __ixp4xx_outsb(u32 io_addr, const u8 *vaddr, u32 count)
 282 {
 283         while (count--)
 284                 outb(*vaddr++, io_addr);
 285 }
 286
 287 static inline void
 288 __ixp4xx_outw(u16 value, u32 addr)
 289 {
 290         u32 n, byte_enables, data;
 291         n = addr % 4;
 292         byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
 293         data = value << (8*n);
 294         ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
 295 }
 296
 297 static inline void
 298 __ixp4xx_outsw(u32 io_addr, const u16 *vaddr, u32 count)
 299 {
 300         while (count--)
 301                 outw(cpu_to_le16(*vaddr++), io_addr);
 302 }
 303
 304 static inline void
 305 __ixp4xx_outl(u32 value, u32 addr)
 306 {
 307         ixp4xx_pci_write(addr, NP_CMD_IOWRITE, value);
 308 }
 309
 310 static inline void
 311 __ixp4xx_outsl(u32 io_addr, const u32 *vaddr, u32 count)
 312 {
 313         while (count--)
 314                 outl(*vaddr++, io_addr);
 315 }
 316
 317 static inline u8
 318 __ixp4xx_inb(u32 addr)
 319 {
 320         u32 n, byte_enables, data;
 321         n = addr % 4;
 322         byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
 323         if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
 324                 return 0xff;
 325
 326         return data >> (8*n);
 327 }
 328
 329 static inline void
 330 __ixp4xx_insb(u32 io_addr, u8 *vaddr, u32 count)
 331 {
 332         while (count--)
 333                 *vaddr++ = inb(io_addr);
 334 }
 335
 336 static inline u16
 337 __ixp4xx_inw(u32 addr)
 338 {
 339         u32 n, byte_enables, data;
 340         n = addr % 4;
 341         byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
 342         if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
 343                 return 0xffff;
 344
 345         return data>>(8*n);
 346 }
 347
 348 static inline void
 349 __ixp4xx_insw(u32 io_addr, u16 *vaddr, u32 count)
 350 {
 351         while (count--)
 352                 *vaddr++ = le16_to_cpu(inw(io_addr));
 353 }
 354
 355 static inline u32
 356 __ixp4xx_inl(u32 addr)
 357 {
 358         u32 data;
 359         if (ixp4xx_pci_read(addr, NP_CMD_IOREAD, &data))
 360                 return 0xffffffff;
 361
 362         return data;
 363 }
 364
 365 static inline void
 366 __ixp4xx_insl(u32 io_addr, u32 *vaddr, u32 count)
 367 {
 368         while (count--)
 369                 *vaddr++ = inl(io_addr);
 370 }
 371
 372 #define PIO_OFFSET      0x10000UL
 373 #define PIO_MASK        0x0ffffUL
 374
 375 #define __is_io_address(p)      (((unsigned long)p >= PIO_OFFSET) && \
 376                                         ((unsigned long)p <= (PIO_MASK + PIO_OFFSET)))
 377 static inline unsigned int
 378 __ixp4xx_ioread8(const void __iomem *addr)
 379 {
 380         unsigned long port = (unsigned long __force)addr;
 381         if (__is_io_address(port))
 382                 return  (unsigned int)__ixp4xx_inb(port & PIO_MASK);
 383         else
 384 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 385                 return (unsigned int)__raw_readb(port);
 386 #else
 387                 return (unsigned int)__ixp4xx_readb(addr);
 388 #endif
 389 }
 390
 391 static inline void
 392 __ixp4xx_ioread8_rep(const void __iomem *addr, void *vaddr, u32 count)
 393 {
 394         unsigned long port = (unsigned long __force)addr;
 395         if (__is_io_address(port))
 396                 __ixp4xx_insb(port & PIO_MASK, vaddr, count);
 397         else
 398 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 399                 __raw_readsb(addr, vaddr, count);
 400 #else
 401                 __ixp4xx_readsb(addr, vaddr, count);
 402 #endif
 403 }
 404
 405 static inline unsigned int
 406 __ixp4xx_ioread16(const void __iomem *addr)
 407 {
 408         unsigned long port = (unsigned long __force)addr;
 409         if (__is_io_address(port))
 410                 return  (unsigned int)__ixp4xx_inw(port & PIO_MASK);
 411         else
 412 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 413                 return le16_to_cpu(__raw_readw((u32)port));
 414 #else
 415                 return (unsigned int)__ixp4xx_readw(addr);
 416 #endif
 417 }
 418
 419 static inline void
 420 __ixp4xx_ioread16_rep(const void __iomem *addr, void *vaddr, u32 count)
 421 {
 422         unsigned long port = (unsigned long __force)addr;
 423         if (__is_io_address(port))
 424                 __ixp4xx_insw(port & PIO_MASK, vaddr, count);
 425         else
 426 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 427                 __raw_readsw(addr, vaddr, count);
 428 #else
 429                 __ixp4xx_readsw(addr, vaddr, count);
 430 #endif
 431 }
 432
 433 static inline unsigned int
 434 __ixp4xx_ioread32(const void __iomem *addr)
 435 {
 436         unsigned long port = (unsigned long __force)addr;
 437         if (__is_io_address(port))
 438                 return  (unsigned int)__ixp4xx_inl(port & PIO_MASK);
 439         else {
 440 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 441                 return le32_to_cpu(__raw_readl((u32)port));
 442 #else
 443                 return (unsigned int)__ixp4xx_readl(addr);
 444 #endif
 445         }
 446 }
 447
 448 static inline void
 449 __ixp4xx_ioread32_rep(const void __iomem *addr, void *vaddr, u32 count)
 450 {
 451         unsigned long port = (unsigned long __force)addr;
 452         if (__is_io_address(port))
 453                 __ixp4xx_insl(port & PIO_MASK, vaddr, count);
 454         else
 455 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 456                 __raw_readsl(addr, vaddr, count);
 457 #else
 458                 __ixp4xx_readsl(addr, vaddr, count);
 459 #endif
 460 }
 461
 462 static inline void
 463 __ixp4xx_iowrite8(u8 value, void __iomem *addr)
 464 {
 465         unsigned long port = (unsigned long __force)addr;
 466         if (__is_io_address(port))
 467                 __ixp4xx_outb(value, port & PIO_MASK);
 468         else
 469 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 470                 __raw_writeb(value, port);
 471 #else
 472                 __ixp4xx_writeb(value, addr);
 473 #endif
 474 }
 475
 476 static inline void
 477 __ixp4xx_iowrite8_rep(void __iomem *addr, const void *vaddr, u32 count)
 478 {
 479         unsigned long port = (unsigned long __force)addr;
 480         if (__is_io_address(port))
 481                 __ixp4xx_outsb(port & PIO_MASK, vaddr, count);
 482         else
 483 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 484                 __raw_writesb(addr, vaddr, count);
 485 #else
 486                 __ixp4xx_writesb(addr, vaddr, count);
 487 #endif
 488 }
 489
 490 static inline void
 491 __ixp4xx_iowrite16(u16 value, void __iomem *addr)
 492 {
 493         unsigned long port = (unsigned long __force)addr;
 494         if (__is_io_address(port))
 495                 __ixp4xx_outw(value, port & PIO_MASK);
 496         else
 497 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 498                 __raw_writew(cpu_to_le16(value), addr);
 499 #else
 500                 __ixp4xx_writew(value, addr);
 501 #endif
 502 }
 503
 504 static inline void
 505 __ixp4xx_iowrite16_rep(void __iomem *addr, const void *vaddr, u32 count)
 506 {
 507         unsigned long port = (unsigned long __force)addr;
 508         if (__is_io_address(port))
 509                 __ixp4xx_outsw(port & PIO_MASK, vaddr, count);
 510         else
 511 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 512                 __raw_writesw(addr, vaddr, count);
 513 #else
 514                 __ixp4xx_writesw(addr, vaddr, count);
 515 #endif
 516 }
 517
 518 static inline void
 519 __ixp4xx_iowrite32(u32 value, void __iomem *addr)
 520 {
 521         unsigned long port = (unsigned long __force)addr;
 522         if (__is_io_address(port))
 523                 __ixp4xx_outl(value, port & PIO_MASK);
 524         else
 525 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 526                 __raw_writel(cpu_to_le32(value), port);
 527 #else
 528                 __ixp4xx_writel(value, addr);
 529 #endif
 530 }
 531
 532 static inline void
 533 __ixp4xx_iowrite32_rep(void __iomem *addr, const void *vaddr, u32 count)
 534 {
 535         unsigned long port = (unsigned long __force)addr;
 536         if (__is_io_address(port))
 537                 __ixp4xx_outsl(port & PIO_MASK, vaddr, count);
 538         else
 539 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 540                 __raw_writesl(addr, vaddr, count);
 541 #else
 542                 __ixp4xx_writesl(addr, vaddr, count);
 543 #endif
 544 }
 545
 546 #define ioread8(p)                      __ixp4xx_ioread8(p)
 547 #define ioread16(p)                     __ixp4xx_ioread16(p)
 548 #define ioread32(p)                     __ixp4xx_ioread32(p)
 549
 550 #define ioread8_rep(p, v, c)            __ixp4xx_ioread8_rep(p, v, c)
 551 #define ioread16_rep(p, v, c)           __ixp4xx_ioread16_rep(p, v, c)
 552 #define ioread32_rep(p, v, c)           __ixp4xx_ioread32_rep(p, v, c)
 553
 554 #define iowrite8(v,p)                   __ixp4xx_iowrite8(v,p)
 555 #define iowrite16(v,p)                  __ixp4xx_iowrite16(v,p)
 556 #define iowrite32(v,p)                  __ixp4xx_iowrite32(v,p)
 557
 558 #define iowrite8_rep(p, v, c)           __ixp4xx_iowrite8_rep(p, v, c)
 559 #define iowrite16_rep(p, v, c)          __ixp4xx_iowrite16_rep(p, v, c)
 560 #define iowrite32_rep(p, v, c)          __ixp4xx_iowrite32_rep(p, v, c)
 561
 562 #define ioport_map(port, nr)            ((void __iomem*)(port + PIO_OFFSET))
 563 #define ioport_unmap(addr)
 564 #endif  // !CONFIG_PCI
 565
 566 #endif  //  __ASM_ARM_ARCH_IO_H
 567