arch/arm/mach-ebsa110/io.c

   1 /*
   2  *  linux/arch/arm/mach-ebsa110/isamem.c
   3  *
   4  *  Copyright (C) 2001 Russell King
   5  *
   6  * Perform "ISA" memory and IO accesses.  The EBSA110 has some "peculiarities"
   7  * in the way it handles accesses to odd IO ports on 16-bit devices.  These
   8  * devices have their D0-D15 lines connected to the processors D0-D15 lines.
   9  * Since they expect all byte IO operations to be performed on D0-D7, and the
  10  * StrongARM expects to transfer the byte to these odd addresses on D8-D15,
  11  * we must use a trick to get the required behaviour.
  12  *
  13  * The trick employed here is to use long word stores to odd address -1.  The
  14  * glue logic picks this up as a "trick" access, and asserts the LSB of the
  15  * peripherals address bus, thereby accessing the odd IO port.  Meanwhile, the
  16  * StrongARM transfers its data on D0-D7 as expected.
  17  *
  18  * Things get more interesting on the pass-1 EBSA110 - the PCMCIA controller
  19  * wiring was screwed in such a way that it had limited memory space access.
  20  * Luckily, the work-around for this is not too horrible.  See
  21  * __isamem_convert_addr for the details.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/types.h>
  26
  27 #include <asm/hardware.h>
  28 #include <asm/io.h>
  29 #include <asm/page.h>
  30
  31 static void __iomem *__isamem_convert_addr(const volatile void __iomem *addr)
  32 {
  33         u32 ret, a = (u32 __force) addr;
  34
  35         /*
  36          * The PCMCIA controller is wired up as follows:
  37          *        +---------+---------+---------+---------+---------+---------+
  38          * PCMCIA | 2 2 2 2 | 1 1 1 1 | 1 1 1 1 | 1 1     |         |         |
  39          *        | 3 2 1 0 | 9 8 7 6 | 5 4 3 2 | 1 0 9 8 | 7 6 5 4 | 3 2 1 0 |
  40          *        +---------+---------+---------+---------+---------+---------+
  41          *  CPU   | 2 2 2 2 | 2 1 1 1 | 1 1 1 1 | 1 1 1   |         |         |
  42          *        | 4 3 2 1 | 0 9 9 8 | 7 6 5 4 | 3 2 0 9 | 8 7 6 5 | 4 3 2 x |
  43          *        +---------+---------+---------+---------+---------+---------+
  44          *
  45          * This means that we can access PCMCIA regions as follows:
  46          *      0x*10000 -> 0x*1ffff
  47          *      0x*70000 -> 0x*7ffff
  48          *      0x*90000 -> 0x*9ffff
  49          *      0x*f0000 -> 0x*fffff
  50          */
  51         ret  = (a & 0xf803fe) << 1;
  52         ret |= (a & 0x03fc00) << 2;
  53
  54         ret += 0xe8000000;
  55
  56         if ((a & 0x20000) == (a & 0x40000) >> 1)
  57                 return (void __iomem *)ret;
  58
  59         BUG();
  60         return NULL;
  61 }
  62
  63 /*
  64  * read[bwl] and write[bwl]
  65  */
  66 u8 __readb(const volatile void __iomem *addr)
  67 {
  68         void __iomem *a = __isamem_convert_addr(addr);
  69         u32 ret;
  70
  71         if ((unsigned long)addr & 1)
  72                 ret = __raw_readl(a);
  73         else
  74                 ret = __raw_readb(a);
  75         return ret;
  76 }
  77
  78 u16 __readw(const volatile void __iomem *addr)
  79 {
  80         void __iomem *a = __isamem_convert_addr(addr);
  81
  82         if ((unsigned long)addr & 1)
  83                 BUG();
  84
  85         return __raw_readw(a);
  86 }
  87
  88 u32 __readl(const volatile void __iomem *addr)
  89 {
  90         void __iomem *a = __isamem_convert_addr(addr);
  91         u32 ret;
  92
  93         if ((unsigned long)addr & 3)
  94                 BUG();
  95
  96         ret = __raw_readw(a);
  97         ret |= __raw_readw(a + 4) << 16;
  98         return ret;
  99 }
 100
 101 EXPORT_SYMBOL(__readb);
 102 EXPORT_SYMBOL(__readw);
 103 EXPORT_SYMBOL(__readl);
 104
 105 void readsw(const void __iomem *addr, void *data, int len)
 106 {
 107         void __iomem *a = __isamem_convert_addr(addr);
 108
 109         BUG_ON((unsigned long)addr & 1);
 110
 111         __raw_readsw(a, data, len);
 112 }
 113 EXPORT_SYMBOL(readsw);
 114
 115 void readsl(const void __iomem *addr, void *data, int len)
 116 {
 117         void __iomem *a = __isamem_convert_addr(addr);
 118
 119         BUG_ON((unsigned long)addr & 3);
 120
 121         __raw_readsl(a, data, len);
 122 }
 123 EXPORT_SYMBOL(readsl);
 124
 125 void __writeb(u8 val, void __iomem *addr)
 126 {
 127         void __iomem *a = __isamem_convert_addr(addr);
 128
 129         if ((unsigned long)addr & 1)
 130                 __raw_writel(val, a);
 131         else
 132                 __raw_writeb(val, a);
 133 }
 134
 135 void __writew(u16 val, void __iomem *addr)
 136 {
 137         void __iomem *a = __isamem_convert_addr(addr);
 138
 139         if ((unsigned long)addr & 1)
 140                 BUG();
 141
 142         __raw_writew(val, a);
 143 }
 144
 145 void __writel(u32 val, void __iomem *addr)
 146 {
 147         void __iomem *a = __isamem_convert_addr(addr);
 148
 149         if ((unsigned long)addr & 3)
 150                 BUG();
 151
 152         __raw_writew(val, a);
 153         __raw_writew(val >> 16, a + 4);
 154 }
 155
 156 EXPORT_SYMBOL(__writeb);
 157 EXPORT_SYMBOL(__writew);
 158 EXPORT_SYMBOL(__writel);
 159
 160 void writesw(void __iomem *addr, const void *data, int len)
 161 {
 162         void __iomem *a = __isamem_convert_addr(addr);
 163
 164         BUG_ON((unsigned long)addr & 1);
 165
 166         __raw_writesw(a, data, len);
 167 }
 168 EXPORT_SYMBOL(writesw);
 169
 170 void writesl(void __iomem *addr, const void *data, int len)
 171 {
 172         void __iomem *a = __isamem_convert_addr(addr);
 173
 174         BUG_ON((unsigned long)addr & 3);
 175
 176         __raw_writesl(a, data, len);
 177 }
 178 EXPORT_SYMBOL(writesl);
 179
 180 #define SUPERIO_PORT(p) \
 181         (((p) >> 3) == (0x3f8 >> 3) || \
 182          ((p) >> 3) == (0x2f8 >> 3) || \
 183          ((p) >> 3) == (0x378 >> 3))
 184
 185 /*
 186  * We're addressing an 8 or 16-bit peripheral which tranfers
 187  * odd addresses on the low ISA byte lane.
 188  */
 189 u8 __inb8(unsigned int port)
 190 {
 191         u32 ret;
 192
 193         /*
 194          * The SuperIO registers use sane addressing techniques...
 195          */
 196         if (SUPERIO_PORT(port))
 197                 ret = __raw_readb((void __iomem *)ISAIO_BASE + (port << 2));
 198         else {
 199                 void __iomem *a = (void __iomem *)ISAIO_BASE + ((port & ~1) << 1);
 200
 201                 /*
 202                  * Shame nothing else does
 203                  */
 204                 if (port & 1)
 205                         ret = __raw_readl(a);
 206                 else
 207                         ret = __raw_readb(a);
 208         }
 209         return ret;
 210 }
 211
 212 /*
 213  * We're addressing a 16-bit peripheral which transfers odd
 214  * addresses on the high ISA byte lane.
 215  */
 216 u8 __inb16(unsigned int port)
 217 {
 218         unsigned int offset;
 219
 220         /*
 221          * The SuperIO registers use sane addressing techniques...
 222          */
 223         if (SUPERIO_PORT(port))
 224                 offset = port << 2;
 225         else
 226                 offset = (port & ~1) << 1 | (port & 1);
 227
 228         return __raw_readb((void __iomem *)ISAIO_BASE + offset);
 229 }
 230
 231 u16 __inw(unsigned int port)
 232 {
 233         unsigned int offset;
 234
 235         /*
 236          * The SuperIO registers use sane addressing techniques...
 237          */
 238         if (SUPERIO_PORT(port))
 239                 offset = port << 2;
 240         else {
 241                 offset = port << 1;
 242                 BUG_ON(port & 1);
 243         }
 244         return __raw_readw((void __iomem *)ISAIO_BASE + offset);
 245 }
 246
 247 /*
 248  * Fake a 32-bit read with two 16-bit reads.  Needed for 3c589.
 249  */
 250 u32 __inl(unsigned int port)
 251 {
 252         void __iomem *a;
 253
 254         if (SUPERIO_PORT(port) || port & 3)
 255                 BUG();
 256
 257         a = (void __iomem *)ISAIO_BASE + ((port & ~1) << 1);
 258
 259         return __raw_readw(a) | __raw_readw(a + 4) << 16;
 260 }
 261
 262 EXPORT_SYMBOL(__inb8);
 263 EXPORT_SYMBOL(__inb16);
 264 EXPORT_SYMBOL(__inw);
 265 EXPORT_SYMBOL(__inl);
 266
 267 void __outb8(u8 val, unsigned int port)
 268 {
 269         /*
 270          * The SuperIO registers use sane addressing techniques...
 271          */
 272         if (SUPERIO_PORT(port))
 273                 __raw_writeb(val, (void __iomem *)ISAIO_BASE + (port << 2));
 274         else {
 275                 void __iomem *a = (void __iomem *)ISAIO_BASE + ((port & ~1) << 1);
 276
 277                 /*
 278                  * Shame nothing else does
 279                  */
 280                 if (port & 1)
 281                         __raw_writel(val, a);
 282                 else
 283                         __raw_writeb(val, a);
 284         }
 285 }
 286
 287 void __outb16(u8 val, unsigned int port)
 288 {
 289         unsigned int offset;
 290
 291         /*
 292          * The SuperIO registers use sane addressing techniques...
 293          */
 294         if (SUPERIO_PORT(port))
 295                 offset = port << 2;
 296         else
 297                 offset = (port & ~1) << 1 | (port & 1);
 298
 299         __raw_writeb(val, (void __iomem *)ISAIO_BASE + offset);
 300 }
 301
 302 void __outw(u16 val, unsigned int port)
 303 {
 304         unsigned int offset;
 305
 306         /*
 307          * The SuperIO registers use sane addressing techniques...
 308          */
 309         if (SUPERIO_PORT(port))
 310                 offset = port << 2;
 311         else {
 312                 offset = port << 1;
 313                 BUG_ON(port & 1);
 314         }
 315         __raw_writew(val, (void __iomem *)ISAIO_BASE + offset);
 316 }
 317
 318 void __outl(u32 val, unsigned int port)
 319 {
 320         BUG();
 321 }
 322
 323 EXPORT_SYMBOL(__outb8);
 324 EXPORT_SYMBOL(__outb16);
 325 EXPORT_SYMBOL(__outw);
 326 EXPORT_SYMBOL(__outl);
 327
 328 void outsb(unsigned int port, const void *from, int len)
 329 {
 330         u32 off;
 331
 332         if (SUPERIO_PORT(port))
 333                 off = port << 2;
 334         else {
 335                 off = (port & ~1) << 1;
 336                 if (port & 1)
 337                         BUG();
 338         }
 339
 340         __raw_writesb((void __iomem *)ISAIO_BASE + off, from, len);
 341 }
 342
 343 void insb(unsigned int port, void *from, int len)
 344 {
 345         u32 off;
 346
 347         if (SUPERIO_PORT(port))
 348                 off = port << 2;
 349         else {
 350                 off = (port & ~1) << 1;
 351                 if (port & 1)
 352                         BUG();
 353         }
 354
 355         __raw_readsb((void __iomem *)ISAIO_BASE + off, from, len);
 356 }
 357
 358 EXPORT_SYMBOL(outsb);
 359 EXPORT_SYMBOL(insb);
 360
 361 void outsw(unsigned int port, const void *from, int len)
 362 {
 363         u32 off;
 364
 365         if (SUPERIO_PORT(port))
 366                 off = port << 2;
 367         else {
 368                 off = (port & ~1) << 1;
 369                 if (port & 1)
 370                         BUG();
 371         }
 372
 373         __raw_writesw((void __iomem *)ISAIO_BASE + off, from, len);
 374 }
 375
 376 void insw(unsigned int port, void *from, int len)
 377 {
 378         u32 off;
 379
 380         if (SUPERIO_PORT(port))
 381                 off = port << 2;
 382         else {
 383                 off = (port & ~1) << 1;
 384                 if (port & 1)
 385                         BUG();
 386         }
 387
 388         __raw_readsw((void __iomem *)ISAIO_BASE + off, from, len);
 389 }
 390
 391 EXPORT_SYMBOL(outsw);
 392 EXPORT_SYMBOL(insw);
 393
 394 /*
 395  * We implement these as 16-bit insw/outsw, mainly for
 396  * 3c589 cards.
 397  */
 398 void outsl(unsigned int port, const void *from, int len)
 399 {
 400         u32 off = port << 1;
 401
 402         if (SUPERIO_PORT(port) || port & 3)
 403                 BUG();
 404
 405         __raw_writesw((void __iomem *)ISAIO_BASE + off, from, len << 1);
 406 }
 407
 408 void insl(unsigned int port, void *from, int len)
 409 {
 410         u32 off = port << 1;
 411
 412         if (SUPERIO_PORT(port) || port & 3)
 413                 BUG();
 414
 415         __raw_readsw((void __iomem *)ISAIO_BASE + off, from, len << 1);
 416 }
 417
 418 EXPORT_SYMBOL(outsl);
 419 EXPORT_SYMBOL(insl);