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

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * arch/arm/mach-ixp4xx/include/mach/io.h
   4  *
   5  * Author: Deepak Saxena <dsaxena@plexity.net>
   6  *
   7  * Copyright (C) 2002-2005  MontaVista Software, Inc.
   8  */
   9
  10 #ifndef __ASM_ARM_ARCH_IO_H
  11 #define __ASM_ARM_ARCH_IO_H
  12
  13 #include <linux/bitops.h>
  14
  15 #include <mach/hardware.h>
  16
  17 extern int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
  18 extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data);
  19
  20
  21 /*
  22  * IXP4xx provides two methods of accessing PCI memory space:
  23  *
  24  * 1) A direct mapped window from 0x48000000 to 0x4BFFFFFF (64MB).
  25  *    To access PCI via this space, we simply ioremap() the BAR
  26  *    into the kernel and we can use the standard read[bwl]/write[bwl]
  27  *    macros. This is the preffered method due to speed but it
  28  *    limits the system to just 64MB of PCI memory. This can be
  29  *    problematic if using video cards and other memory-heavy targets.
  30  *
  31  * 2) If > 64MB of memory space is required, the IXP4xx can use indirect
  32  *    registers to access the whole 4 GB of PCI memory space (as we do below
  33  *    for I/O transactions). This allows currently for up to 1 GB (0x10000000
  34  *    to 0x4FFFFFFF) of memory on the bus. The disadvantage of this is that
  35  *    every PCI access requires three local register accesses plus a spinlock,
  36  *    but in some cases the performance hit is acceptable. In addition, you
  37  *    cannot mmap() PCI devices in this case.
  38  */
  39 #ifdef  CONFIG_IXP4XX_INDIRECT_PCI
  40
  41 /*
  42  * In the case of using indirect PCI, we simply return the actual PCI
  43  * address and our read/write implementation use that to drive the
  44  * access registers. If something outside of PCI is ioremap'd, we
  45  * fallback to the default.
  46  */
  47
  48 extern unsigned long pcibios_min_mem;
  49 static inline int is_pci_memory(u32 addr)
  50 {
  51         return (addr >= pcibios_min_mem) && (addr <= 0x4FFFFFFF);
  52 }
  53
  54 #define writeb(v, p)                    __indirect_writeb(v, p)
  55 #define writew(v, p)                    __indirect_writew(v, p)
  56 #define writel(v, p)                    __indirect_writel(v, p)
  57
  58 #define writeb_relaxed(v, p)            __indirect_writeb(v, p)
  59 #define writew_relaxed(v, p)            __indirect_writew(v, p)
  60 #define writel_relaxed(v, p)            __indirect_writel(v, p)
  61
  62 #define writesb(p, v, l)                __indirect_writesb(p, v, l)
  63 #define writesw(p, v, l)                __indirect_writesw(p, v, l)
  64 #define writesl(p, v, l)                __indirect_writesl(p, v, l)
  65
  66 #define readb(p)                        __indirect_readb(p)
  67 #define readw(p)                        __indirect_readw(p)
  68 #define readl(p)                        __indirect_readl(p)
  69
  70 #define readb_relaxed(p)                __indirect_readb(p)
  71 #define readw_relaxed(p)                __indirect_readw(p)
  72 #define readl_relaxed(p)                __indirect_readl(p)
  73
  74 #define readsb(p, v, l)                 __indirect_readsb(p, v, l)
  75 #define readsw(p, v, l)                 __indirect_readsw(p, v, l)
  76 #define readsl(p, v, l)                 __indirect_readsl(p, v, l)
  77
  78 static inline void __indirect_writeb(u8 value, volatile void __iomem *p)
  79 {
  80         u32 addr = (u32)p;
  81         u32 n, byte_enables, data;
  82
  83         if (!is_pci_memory(addr)) {
  84                 __raw_writeb(value, p);
  85                 return;
  86         }
  87
  88         n = addr % 4;
  89         byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
  90         data = value << (8*n);
  91         ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
  92 }
  93
  94 static inline void __indirect_writesb(volatile void __iomem *bus_addr,
  95                                       const void *p, int count)
  96 {
  97         const u8 *vaddr = p;
  98
  99         while (count--)
 100                 writeb(*vaddr++, bus_addr);
 101 }
 102
 103 static inline void __indirect_writew(u16 value, volatile void __iomem *p)
 104 {
 105         u32 addr = (u32)p;
 106         u32 n, byte_enables, data;
 107
 108         if (!is_pci_memory(addr)) {
 109                 __raw_writew(value, p);
 110                 return;
 111         }
 112
 113         n = addr % 4;
 114         byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
 115         data = value << (8*n);
 116         ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
 117 }
 118
 119 static inline void __indirect_writesw(volatile void __iomem *bus_addr,
 120                                       const void *p, int count)
 121 {
 122         const u16 *vaddr = p;
 123
 124         while (count--)
 125                 writew(*vaddr++, bus_addr);
 126 }
 127
 128 static inline void __indirect_writel(u32 value, volatile void __iomem *p)
 129 {
 130         u32 addr = (__force u32)p;
 131
 132         if (!is_pci_memory(addr)) {
 133                 __raw_writel(value, p);
 134                 return;
 135         }
 136
 137         ixp4xx_pci_write(addr, NP_CMD_MEMWRITE, value);
 138 }
 139
 140 static inline void __indirect_writesl(volatile void __iomem *bus_addr,
 141                                       const void *p, int count)
 142 {
 143         const u32 *vaddr = p;
 144         while (count--)
 145                 writel(*vaddr++, bus_addr);
 146 }
 147
 148 static inline u8 __indirect_readb(const volatile void __iomem *p)
 149 {
 150         u32 addr = (u32)p;
 151         u32 n, byte_enables, data;
 152
 153         if (!is_pci_memory(addr))
 154                 return __raw_readb(p);
 155
 156         n = addr % 4;
 157         byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
 158         if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
 159                 return 0xff;
 160
 161         return data >> (8*n);
 162 }
 163
 164 static inline void __indirect_readsb(const volatile void __iomem *bus_addr,
 165                                      void *p, u32 count)
 166 {
 167         u8 *vaddr = p;
 168
 169         while (count--)
 170                 *vaddr++ = readb(bus_addr);
 171 }
 172
 173 static inline u16 __indirect_readw(const volatile void __iomem *p)
 174 {
 175         u32 addr = (u32)p;
 176         u32 n, byte_enables, data;
 177
 178         if (!is_pci_memory(addr))
 179                 return __raw_readw(p);
 180
 181         n = addr % 4;
 182         byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
 183         if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
 184                 return 0xffff;
 185
 186         return data>>(8*n);
 187 }
 188
 189 static inline void __indirect_readsw(const volatile void __iomem *bus_addr,
 190                                      void *p, u32 count)
 191 {
 192         u16 *vaddr = p;
 193
 194         while (count--)
 195                 *vaddr++ = readw(bus_addr);
 196 }
 197
 198 static inline u32 __indirect_readl(const volatile void __iomem *p)
 199 {
 200         u32 addr = (__force u32)p;
 201         u32 data;
 202
 203         if (!is_pci_memory(addr))
 204                 return __raw_readl(p);
 205
 206         if (ixp4xx_pci_read(addr, NP_CMD_MEMREAD, &data))
 207                 return 0xffffffff;
 208
 209         return data;
 210 }
 211
 212 static inline void __indirect_readsl(const volatile void __iomem *bus_addr,
 213                                      void *p, u32 count)
 214 {
 215         u32 *vaddr = p;
 216
 217         while (count--)
 218                 *vaddr++ = readl(bus_addr);
 219 }
 220
 221
 222 /*
 223  * We can use the built-in functions b/c they end up calling writeb/readb
 224  */
 225 #define memset_io(c,v,l)                _memset_io((c),(v),(l))
 226 #define memcpy_fromio(a,c,l)            _memcpy_fromio((a),(c),(l))
 227 #define memcpy_toio(c,a,l)              _memcpy_toio((c),(a),(l))
 228
 229 #endif /* CONFIG_IXP4XX_INDIRECT_PCI */
 230
 231 #ifndef CONFIG_PCI
 232
 233 #define __io(v)         __typesafe_io(v)
 234
 235 #else
 236
 237 /*
 238  * IXP4xx does not have a transparent cpu -> PCI I/O translation
 239  * window.  Instead, it has a set of registers that must be tweaked
 240  * with the proper byte lanes, command types, and address for the
 241  * transaction.  This means that we need to override the default
 242  * I/O functions.
 243  */
 244
 245 #define outb outb
 246 static inline void outb(u8 value, u32 addr)
 247 {
 248         u32 n, byte_enables, data;
 249         n = addr % 4;
 250         byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
 251         data = value << (8*n);
 252         ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
 253 }
 254
 255 #define outsb outsb
 256 static inline void outsb(u32 io_addr, const void *p, u32 count)
 257 {
 258         const u8 *vaddr = p;
 259
 260         while (count--)
 261                 outb(*vaddr++, io_addr);
 262 }
 263
 264 #define outw outw
 265 static inline void outw(u16 value, u32 addr)
 266 {
 267         u32 n, byte_enables, data;
 268         n = addr % 4;
 269         byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
 270         data = value << (8*n);
 271         ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
 272 }
 273
 274 #define outsw outsw
 275 static inline void outsw(u32 io_addr, const void *p, u32 count)
 276 {
 277         const u16 *vaddr = p;
 278         while (count--)
 279                 outw(cpu_to_le16(*vaddr++), io_addr);
 280 }
 281
 282 #define outl outl
 283 static inline void outl(u32 value, u32 addr)
 284 {
 285         ixp4xx_pci_write(addr, NP_CMD_IOWRITE, value);
 286 }
 287
 288 #define outsl outsl
 289 static inline void outsl(u32 io_addr, const void *p, u32 count)
 290 {
 291         const u32 *vaddr = p;
 292         while (count--)
 293                 outl(cpu_to_le32(*vaddr++), io_addr);
 294 }
 295
 296 #define inb inb
 297 static inline u8 inb(u32 addr)
 298 {
 299         u32 n, byte_enables, data;
 300         n = addr % 4;
 301         byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
 302         if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
 303                 return 0xff;
 304
 305         return data >> (8*n);
 306 }
 307
 308 #define insb insb
 309 static inline void insb(u32 io_addr, void *p, u32 count)
 310 {
 311         u8 *vaddr = p;
 312         while (count--)
 313                 *vaddr++ = inb(io_addr);
 314 }
 315
 316 #define inw inw
 317 static inline u16 inw(u32 addr)
 318 {
 319         u32 n, byte_enables, data;
 320         n = addr % 4;
 321         byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
 322         if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
 323                 return 0xffff;
 324
 325         return data>>(8*n);
 326 }
 327
 328 #define insw insw
 329 static inline void insw(u32 io_addr, void *p, u32 count)
 330 {
 331         u16 *vaddr = p;
 332         while (count--)
 333                 *vaddr++ = le16_to_cpu(inw(io_addr));
 334 }
 335
 336 #define inl inl
 337 static inline u32 inl(u32 addr)
 338 {
 339         u32 data;
 340         if (ixp4xx_pci_read(addr, NP_CMD_IOREAD, &data))
 341                 return 0xffffffff;
 342
 343         return data;
 344 }
 345
 346 #define insl insl
 347 static inline void insl(u32 io_addr, void *p, u32 count)
 348 {
 349         u32 *vaddr = p;
 350         while (count--)
 351                 *vaddr++ = le32_to_cpu(inl(io_addr));
 352 }
 353
 354 #define PIO_OFFSET      0x10000UL
 355 #define PIO_MASK        0x0ffffUL
 356
 357 #define __is_io_address(p)      (((unsigned long)p >= PIO_OFFSET) && \
 358                                         ((unsigned long)p <= (PIO_MASK + PIO_OFFSET)))
 359
 360 #define ioread8(p)                      ioread8(p)
 361 static inline u8 ioread8(const void __iomem *addr)
 362 {
 363         unsigned long port = (unsigned long __force)addr;
 364         if (__is_io_address(port))
 365                 return (unsigned int)inb(port & PIO_MASK);
 366         else
 367 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 368                 return (unsigned int)__raw_readb(addr);
 369 #else
 370                 return (unsigned int)__indirect_readb(addr);
 371 #endif
 372 }
 373
 374 #define ioread8_rep(p, v, c)            ioread8_rep(p, v, c)
 375 static inline void ioread8_rep(const void __iomem *addr, void *vaddr, u32 count)
 376 {
 377         unsigned long port = (unsigned long __force)addr;
 378         if (__is_io_address(port))
 379                 insb(port & PIO_MASK, vaddr, count);
 380         else
 381 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 382                 __raw_readsb(addr, vaddr, count);
 383 #else
 384                 __indirect_readsb(addr, vaddr, count);
 385 #endif
 386 }
 387
 388 #define ioread16(p)                     ioread16(p)
 389 static inline u16 ioread16(const void __iomem *addr)
 390 {
 391         unsigned long port = (unsigned long __force)addr;
 392         if (__is_io_address(port))
 393                 return  (unsigned int)inw(port & PIO_MASK);
 394         else
 395 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 396                 return le16_to_cpu((__force __le16)__raw_readw(addr));
 397 #else
 398                 return (unsigned int)__indirect_readw(addr);
 399 #endif
 400 }
 401
 402 #define ioread16_rep(p, v, c)           ioread16_rep(p, v, c)
 403 static inline void ioread16_rep(const void __iomem *addr, void *vaddr,
 404                                 u32 count)
 405 {
 406         unsigned long port = (unsigned long __force)addr;
 407         if (__is_io_address(port))
 408                 insw(port & PIO_MASK, vaddr, count);
 409         else
 410 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 411                 __raw_readsw(addr, vaddr, count);
 412 #else
 413                 __indirect_readsw(addr, vaddr, count);
 414 #endif
 415 }
 416
 417 #define ioread32(p)                     ioread32(p)
 418 static inline u32 ioread32(const void __iomem *addr)
 419 {
 420         unsigned long port = (unsigned long __force)addr;
 421         if (__is_io_address(port))
 422                 return  (unsigned int)inl(port & PIO_MASK);
 423         else {
 424 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 425                 return le32_to_cpu((__force __le32)__raw_readl(addr));
 426 #else
 427                 return (unsigned int)__indirect_readl(addr);
 428 #endif
 429         }
 430 }
 431
 432 #define ioread32_rep(p, v, c)           ioread32_rep(p, v, c)
 433 static inline void ioread32_rep(const void __iomem *addr, void *vaddr,
 434                                 u32 count)
 435 {
 436         unsigned long port = (unsigned long __force)addr;
 437         if (__is_io_address(port))
 438                 insl(port & PIO_MASK, vaddr, count);
 439         else
 440 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 441                 __raw_readsl(addr, vaddr, count);
 442 #else
 443                 __indirect_readsl(addr, vaddr, count);
 444 #endif
 445 }
 446
 447 #define iowrite8(v, p)                  iowrite8(v, p)
 448 static inline void iowrite8(u8 value, void __iomem *addr)
 449 {
 450         unsigned long port = (unsigned long __force)addr;
 451         if (__is_io_address(port))
 452                 outb(value, port & PIO_MASK);
 453         else
 454 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 455                 __raw_writeb(value, addr);
 456 #else
 457                 __indirect_writeb(value, addr);
 458 #endif
 459 }
 460
 461 #define iowrite8_rep(p, v, c)           iowrite8_rep(p, v, c)
 462 static inline void iowrite8_rep(void __iomem *addr, const void *vaddr,
 463                                 u32 count)
 464 {
 465         unsigned long port = (unsigned long __force)addr;
 466         if (__is_io_address(port))
 467                 outsb(port & PIO_MASK, vaddr, count);
 468         else
 469 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 470                 __raw_writesb(addr, vaddr, count);
 471 #else
 472                 __indirect_writesb(addr, vaddr, count);
 473 #endif
 474 }
 475
 476 #define iowrite16(v, p)                 iowrite16(v, p)
 477 static inline void iowrite16(u16 value, void __iomem *addr)
 478 {
 479         unsigned long port = (unsigned long __force)addr;
 480         if (__is_io_address(port))
 481                 outw(value, port & PIO_MASK);
 482         else
 483 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 484                 __raw_writew(cpu_to_le16(value), addr);
 485 #else
 486                 __indirect_writew(value, addr);
 487 #endif
 488 }
 489
 490 #define iowrite16_rep(p, v, c)          iowrite16_rep(p, v, c)
 491 static inline void iowrite16_rep(void __iomem *addr, const void *vaddr,
 492                                  u32 count)
 493 {
 494         unsigned long port = (unsigned long __force)addr;
 495         if (__is_io_address(port))
 496                 outsw(port & PIO_MASK, vaddr, count);
 497         else
 498 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 499                 __raw_writesw(addr, vaddr, count);
 500 #else
 501                 __indirect_writesw(addr, vaddr, count);
 502 #endif
 503 }
 504
 505 #define iowrite32(v, p)                 iowrite32(v, p)
 506 static inline void iowrite32(u32 value, void __iomem *addr)
 507 {
 508         unsigned long port = (unsigned long __force)addr;
 509         if (__is_io_address(port))
 510                 outl(value, port & PIO_MASK);
 511         else
 512 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 513                 __raw_writel((u32 __force)cpu_to_le32(value), addr);
 514 #else
 515                 __indirect_writel(value, addr);
 516 #endif
 517 }
 518
 519 #define iowrite32_rep(p, v, c)          iowrite32_rep(p, v, c)
 520 static inline void iowrite32_rep(void __iomem *addr, const void *vaddr,
 521                                  u32 count)
 522 {
 523         unsigned long port = (unsigned long __force)addr;
 524         if (__is_io_address(port))
 525                 outsl(port & PIO_MASK, vaddr, count);
 526         else
 527 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
 528                 __raw_writesl(addr, vaddr, count);
 529 #else
 530                 __indirect_writesl(addr, vaddr, count);
 531 #endif
 532 }
 533
 534 #define ioport_map(port, nr) ioport_map(port, nr)
 535 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 536 {
 537         return ((void __iomem*)((port) + PIO_OFFSET));
 538 }
 539 #define ioport_unmap(addr) ioport_unmap(addr)
 540 static inline void ioport_unmap(void __iomem *addr)
 541 {
 542 }
 543 #endif /* CONFIG_PCI */
 544
 545 #endif /* __ASM_ARM_ARCH_IO_H */